Merge pull request #9258 from tamird/dep-cleanup

Gopkg.toml: remove unnecessary constraints and add pruning

Gopkg.lock

@@ -5,7 +5,6 @@
   name = "github.com/beorn7/perks"
   packages = ["quantile"]
   revision = "4c0e84591b9aa9e6dcfdf3e020114cd81f89d5f9"
-  source = "https://github.com/beorn7/perks"
 
 [[projects]]
   name = "github.com/bgentry/speakeasy"
@@ -48,7 +47,6 @@
   name = "github.com/cpuguy83/go-md2man"
   packages = ["md2man"]
   revision = "23709d0847197db6021a51fdb193e66e9222d4e7"
-  source = "https://github.com/cpuguy83/go-md2man"
 
 [[projects]]
   name = "github.com/dgrijalva/jwt-go"
@@ -104,7 +102,6 @@
   name = "github.com/gorilla/websocket"
   packages = ["."]
   revision = "4201258b820c74ac8e6922fc9e6b52f71fe46f8d"
-  source = "https://github.com/gorilla/websocket"
 
 [[projects]]
   name = "github.com/grpc-ecosystem/go-grpc-prometheus"
@@ -143,7 +140,6 @@
   name = "github.com/mattn/go-runewidth"
   packages = ["."]
   revision = "9e777a8366cce605130a531d2cd6363d07ad7317"
-  source = "https://github.com/mattn/go-runewidth"
   version = "v0.0.2"
 
 [[projects]]
@@ -184,7 +180,6 @@
     "model"
   ]
   revision = "e3fb1a1acd7605367a2b378bc2e2f893c05174b7"
-  source = "https://github.com/prometheus/common"
 
 [[projects]]
   name = "github.com/prometheus/procfs"
@@ -193,19 +188,16 @@
     "xfs"
   ]
   revision = "a6e9df898b1336106c743392c48ee0b71f5c4efa"
-  source = "https://github.com/prometheus/procfs"
 
 [[projects]]
   name = "github.com/russross/blackfriday"
   packages = ["."]
   revision = "4048872b16cc0fc2c5fd9eacf0ed2c2fedaa0c8c"
-  source = "https://github.com/russross/blackfriday"
 
 [[projects]]
   name = "github.com/sirupsen/logrus"
   packages = ["."]
   revision = "f006c2ac4710855cf0f916dd6b77acf6b048dc6e"
-  source = "https://github.com/sirupsen/logrus"
   version = "v1.0.3"
 
 [[projects]]
@@ -276,7 +268,6 @@
     "windows"
   ]
   revision = "ebfc5b4631820b793c9010c87fd8fef0f39eb082"
-  source = "https://github.com/golang/sys"
 
 [[projects]]
   name = "golang.org/x/text"
@@ -292,7 +283,6 @@
     "unicode/rangetable"
   ]
   revision = "b19bf474d317b857955b12035d2c5acb57ce8b01"
-  source = "https://github.com/golang/text"
 
 [[projects]]
   name = "golang.org/x/time"
@@ -303,7 +293,6 @@
   name = "google.golang.org/genproto"
   packages = ["googleapis/rpc/status"]
   revision = "09f6ed296fc66555a25fe4ce95173148778dfa85"
-  source = "https://github.com/google/go-genproto"
 
 [[projects]]
   name = "google.golang.org/grpc"
@@ -341,11 +330,10 @@
   name = "gopkg.in/yaml.v2"
   packages = ["."]
   revision = "cd8b52f8269e0feb286dfeef29f8fe4d5b397e0b"
-  source = "https://github.com/go-yaml/yaml"
 
 [solve-meta]
   analyzer-name = "dep"
   analyzer-version = 1
-  inputs-digest = "96fbefc6136356d14bdf753a4a6ccf6279d81c55eba28c5f5bdb915d075fc171"
+  inputs-digest = "54d78c9d66910169e10670b6e078ade50428e2019bd28a5987470fb2da185e26"
   solver-name = "gps-cdcl"
   solver-version = 1

Gopkg.toml

@@ -1,71 +1,3 @@
-################################
-# Direct dependencies
-
-# See "Gopkg.lock"
-
-################################
-
-################################
-# Transitive dependencies, and overrides
-
-[[override]]
-  name = "google.golang.org/genproto"
-  source = "https://github.com/google/go-genproto"
-  revision = "09f6ed296fc66555a25fe4ce95173148778dfa85"
-
-[[override]]
-  name = "golang.org/x/sys"
-  source = "https://github.com/golang/sys"
-  revision = "ebfc5b4631820b793c9010c87fd8fef0f39eb082"
-
-[[override]]
-  name = "golang.org/x/text"
-  source = "https://github.com/golang/text"
-  revision = "b19bf474d317b857955b12035d2c5acb57ce8b01"
-
-[[override]]
-  name = "github.com/gorilla/websocket"
-  source = "https://github.com/gorilla/websocket"
-  revision = "4201258b820c74ac8e6922fc9e6b52f71fe46f8d"
-
-[[override]]
-  name = "gopkg.in/yaml.v2"
-  source = "https://github.com/go-yaml/yaml"
-  revision = "cd8b52f8269e0feb286dfeef29f8fe4d5b397e0b"
-
-[[override]]
-  name = "github.com/cpuguy83/go-md2man"
-  source = "https://github.com/cpuguy83/go-md2man"
-  revision = "23709d0847197db6021a51fdb193e66e9222d4e7"
-
-[[override]]
-  name = "github.com/russross/blackfriday"
-  source = "https://github.com/russross/blackfriday"
-  revision = "4048872b16cc0fc2c5fd9eacf0ed2c2fedaa0c8c"
-
-[[override]]
-  name = "github.com/prometheus/common"
-  source = "https://github.com/prometheus/common"
-  revision = "e3fb1a1acd7605367a2b378bc2e2f893c05174b7"
-
-[[override]]
-  name = "github.com/prometheus/procfs"
-  source = "https://github.com/prometheus/procfs"
-  revision = "a6e9df898b1336106c743392c48ee0b71f5c4efa"
-
-[[override]]
-  name = "github.com/beorn7/perks"
-  source = "https://github.com/beorn7/perks"
-  revision = "4c0e84591b9aa9e6dcfdf3e020114cd81f89d5f9"
-
-[[override]]
-  name = "github.com/sirupsen/logrus"
-  source = "https://github.com/sirupsen/logrus"
-  version = "=v1.0.3"
-
-[[override]]
-  name = "github.com/mattn/go-runewidth"
-  source = "https://github.com/mattn/go-runewidth"
-  version = "=v0.0.2"
-
-################################
+[prune]
+  go-tests = true
+  unused-packages = true

vendor/github.com/coreos/go-semver/example.go

@@ -1,20 +0,0 @@
-package main
-
-import (
-	"fmt"
-	"github.com/coreos/go-semver/semver"
-	"os"
-)
-
-func main() {
-	vA, err := semver.NewVersion(os.Args[1])
-	if err != nil {
-		fmt.Println(err.Error())
-	}
-	vB, err := semver.NewVersion(os.Args[2])
-	if err != nil {
-		fmt.Println(err.Error())
-	}
-
-	fmt.Printf("%s < %s == %t\n", vA, vB, vA.LessThan(*vB))
-}

vendor/github.com/cpuguy83/go-md2man/md2man.go

@@ -1,51 +0,0 @@
-package main
-
-import (
-	"flag"
-	"fmt"
-	"io/ioutil"
-	"os"
-
-	"github.com/cpuguy83/go-md2man/md2man"
-)
-
-var inFilePath = flag.String("in", "", "Path to file to be processed (default: stdin)")
-var outFilePath = flag.String("out", "", "Path to output processed file (default: stdout)")
-
-func main() {
-	var err error
-	flag.Parse()
-
-	inFile := os.Stdin
-	if *inFilePath != "" {
-		inFile, err = os.Open(*inFilePath)
-		if err != nil {
-			fmt.Println(err)
-			os.Exit(1)
-		}
-	}
-	defer inFile.Close()
-
-	doc, err := ioutil.ReadAll(inFile)
-	if err != nil {
-		fmt.Println(err)
-		os.Exit(1)
-	}
-
-	out := md2man.Render(doc)
-
-	outFile := os.Stdout
-	if *outFilePath != "" {
-		outFile, err = os.Create(*outFilePath)
-		if err != nil {
-			fmt.Println(err)
-			os.Exit(1)
-		}
-		defer outFile.Close()
-	}
-	_, err = outFile.Write(out)
-	if err != nil {
-		fmt.Println(err)
-		os.Exit(1)
-	}
-}

vendor/github.com/gogo/protobuf/protoc-gen-gogo/doc.go

@@ -1,51 +0,0 @@
-// Go support for Protocol Buffers - Google's data interchange format
-//
-// Copyright 2010 The Go Authors.  All rights reserved.
-// https://github.com/golang/protobuf
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-/*
-	A plugin for the Google protocol buffer compiler to generate Go code.
-	Run it by building this program and putting it in your path with the name
-		protoc-gen-gogo
-	That word 'gogo' at the end becomes part of the option string set for the
-	protocol compiler, so once the protocol compiler (protoc) is installed
-	you can run
-		protoc --gogo_out=output_directory input_directory/file.proto
-	to generate Go bindings for the protocol defined by file.proto.
-	With that input, the output will be written to
-		output_directory/go_package/file.pb.go
-
-	The generated code is documented in the package comment for
-	the library.
-
-	See the README and documentation for protocol buffers to learn more:
-		https://developers.google.com/protocol-buffers/
-
-*/
-package documentation

vendor/github.com/gogo/protobuf/protoc-gen-gogo/main.go

@@ -1,57 +0,0 @@
-// Go support for Protocol Buffers - Google's data interchange format
-//
-// Copyright 2010 The Go Authors.  All rights reserved.
-// https://github.com/golang/protobuf
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-// protoc-gen-go is a plugin for the Google protocol buffer compiler to generate
-// Go code.  Run it by building this program and putting it in your path with
-// the name
-// 	protoc-gen-gogo
-// That word 'gogo' at the end becomes part of the option string set for the
-// protocol compiler, so once the protocol compiler (protoc) is installed
-// you can run
-// 	protoc --gogo_out=output_directory input_directory/file.proto
-// to generate Go bindings for the protocol defined by file.proto.
-// With that input, the output will be written to
-// 	output_directory/file.pb.go
-//
-// The generated code is documented in the package comment for
-// the library.
-//
-// See the README and documentation for protocol buffers to learn more:
-// 	https://developers.google.com/protocol-buffers/
-package main
-
-import (
-	"github.com/gogo/protobuf/vanity/command"
-)
-
-func main() {
-	command.Write(command.Generate(command.Read()))
-}

vendor/github.com/golang/groupcache/byteview.go

@@ -1,160 +0,0 @@
-/*
-Copyright 2012 Google Inc.
-
-Licensed under the Apache License, Version 2.0 (the "License");
-you may not use this file except in compliance with the License.
-You may obtain a copy of the License at
-
-     http://www.apache.org/licenses/LICENSE-2.0
-
-Unless required by applicable law or agreed to in writing, software
-distributed under the License is distributed on an "AS IS" BASIS,
-WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-See the License for the specific language governing permissions and
-limitations under the License.
-*/
-
-package groupcache
-
-import (
-	"bytes"
-	"errors"
-	"io"
-	"strings"
-)
-
-// A ByteView holds an immutable view of bytes.
-// Internally it wraps either a []byte or a string,
-// but that detail is invisible to callers.
-//
-// A ByteView is meant to be used as a value type, not
-// a pointer (like a time.Time).
-type ByteView struct {
-	// If b is non-nil, b is used, else s is used.
-	b []byte
-	s string
-}
-
-// Len returns the view's length.
-func (v ByteView) Len() int {
-	if v.b != nil {
-		return len(v.b)
-	}
-	return len(v.s)
-}
-
-// ByteSlice returns a copy of the data as a byte slice.
-func (v ByteView) ByteSlice() []byte {
-	if v.b != nil {
-		return cloneBytes(v.b)
-	}
-	return []byte(v.s)
-}
-
-// String returns the data as a string, making a copy if necessary.
-func (v ByteView) String() string {
-	if v.b != nil {
-		return string(v.b)
-	}
-	return v.s
-}
-
-// At returns the byte at index i.
-func (v ByteView) At(i int) byte {
-	if v.b != nil {
-		return v.b[i]
-	}
-	return v.s[i]
-}
-
-// Slice slices the view between the provided from and to indices.
-func (v ByteView) Slice(from, to int) ByteView {
-	if v.b != nil {
-		return ByteView{b: v.b[from:to]}
-	}
-	return ByteView{s: v.s[from:to]}
-}
-
-// SliceFrom slices the view from the provided index until the end.
-func (v ByteView) SliceFrom(from int) ByteView {
-	if v.b != nil {
-		return ByteView{b: v.b[from:]}
-	}
-	return ByteView{s: v.s[from:]}
-}
-
-// Copy copies b into dest and returns the number of bytes copied.
-func (v ByteView) Copy(dest []byte) int {
-	if v.b != nil {
-		return copy(dest, v.b)
-	}
-	return copy(dest, v.s)
-}
-
-// Equal returns whether the bytes in b are the same as the bytes in
-// b2.
-func (v ByteView) Equal(b2 ByteView) bool {
-	if b2.b == nil {
-		return v.EqualString(b2.s)
-	}
-	return v.EqualBytes(b2.b)
-}
-
-// EqualString returns whether the bytes in b are the same as the bytes
-// in s.
-func (v ByteView) EqualString(s string) bool {
-	if v.b == nil {
-		return v.s == s
-	}
-	l := v.Len()
-	if len(s) != l {
-		return false
-	}
-	for i, bi := range v.b {
-		if bi != s[i] {
-			return false
-		}
-	}
-	return true
-}
-
-// EqualBytes returns whether the bytes in b are the same as the bytes
-// in b2.
-func (v ByteView) EqualBytes(b2 []byte) bool {
-	if v.b != nil {
-		return bytes.Equal(v.b, b2)
-	}
-	l := v.Len()
-	if len(b2) != l {
-		return false
-	}
-	for i, bi := range b2 {
-		if bi != v.s[i] {
-			return false
-		}
-	}
-	return true
-}
-
-// Reader returns an io.ReadSeeker for the bytes in v.
-func (v ByteView) Reader() io.ReadSeeker {
-	if v.b != nil {
-		return bytes.NewReader(v.b)
-	}
-	return strings.NewReader(v.s)
-}
-
-// ReadAt implements io.ReaderAt on the bytes in v.
-func (v ByteView) ReadAt(p []byte, off int64) (n int, err error) {
-	if off < 0 {
-		return 0, errors.New("view: invalid offset")
-	}
-	if off >= int64(v.Len()) {
-		return 0, io.EOF
-	}
-	n = v.SliceFrom(int(off)).Copy(p)
-	if n < len(p) {
-		err = io.EOF
-	}
-	return
-}

vendor/github.com/golang/groupcache/groupcache.go

@@ -1,489 +0,0 @@
-/*
-Copyright 2012 Google Inc.
-
-Licensed under the Apache License, Version 2.0 (the "License");
-you may not use this file except in compliance with the License.
-You may obtain a copy of the License at
-
-     http://www.apache.org/licenses/LICENSE-2.0
-
-Unless required by applicable law or agreed to in writing, software
-distributed under the License is distributed on an "AS IS" BASIS,
-WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-See the License for the specific language governing permissions and
-limitations under the License.
-*/
-
-// Package groupcache provides a data loading mechanism with caching
-// and de-duplication that works across a set of peer processes.
-//
-// Each data Get first consults its local cache, otherwise delegates
-// to the requested key's canonical owner, which then checks its cache
-// or finally gets the data.  In the common case, many concurrent
-// cache misses across a set of peers for the same key result in just
-// one cache fill.
-package groupcache
-
-import (
-	"errors"
-	"math/rand"
-	"strconv"
-	"sync"
-	"sync/atomic"
-
-	pb "github.com/golang/groupcache/groupcachepb"
-	"github.com/golang/groupcache/lru"
-	"github.com/golang/groupcache/singleflight"
-)
-
-// A Getter loads data for a key.
-type Getter interface {
-	// Get returns the value identified by key, populating dest.
-	//
-	// The returned data must be unversioned. That is, key must
-	// uniquely describe the loaded data, without an implicit
-	// current time, and without relying on cache expiration
-	// mechanisms.
-	Get(ctx Context, key string, dest Sink) error
-}
-
-// A GetterFunc implements Getter with a function.
-type GetterFunc func(ctx Context, key string, dest Sink) error
-
-func (f GetterFunc) Get(ctx Context, key string, dest Sink) error {
-	return f(ctx, key, dest)
-}
-
-var (
-	mu     sync.RWMutex
-	groups = make(map[string]*Group)
-
-	initPeerServerOnce sync.Once
-	initPeerServer     func()
-)
-
-// GetGroup returns the named group previously created with NewGroup, or
-// nil if there's no such group.
-func GetGroup(name string) *Group {
-	mu.RLock()
-	g := groups[name]
-	mu.RUnlock()
-	return g
-}
-
-// NewGroup creates a coordinated group-aware Getter from a Getter.
-//
-// The returned Getter tries (but does not guarantee) to run only one
-// Get call at once for a given key across an entire set of peer
-// processes. Concurrent callers both in the local process and in
-// other processes receive copies of the answer once the original Get
-// completes.
-//
-// The group name must be unique for each getter.
-func NewGroup(name string, cacheBytes int64, getter Getter) *Group {
-	return newGroup(name, cacheBytes, getter, nil)
-}
-
-// If peers is nil, the peerPicker is called via a sync.Once to initialize it.
-func newGroup(name string, cacheBytes int64, getter Getter, peers PeerPicker) *Group {
-	if getter == nil {
-		panic("nil Getter")
-	}
-	mu.Lock()
-	defer mu.Unlock()
-	initPeerServerOnce.Do(callInitPeerServer)
-	if _, dup := groups[name]; dup {
-		panic("duplicate registration of group " + name)
-	}
-	g := &Group{
-		name:       name,
-		getter:     getter,
-		peers:      peers,
-		cacheBytes: cacheBytes,
-		loadGroup:  &singleflight.Group{},
-	}
-	if fn := newGroupHook; fn != nil {
-		fn(g)
-	}
-	groups[name] = g
-	return g
-}
-
-// newGroupHook, if non-nil, is called right after a new group is created.
-var newGroupHook func(*Group)
-
-// RegisterNewGroupHook registers a hook that is run each time
-// a group is created.
-func RegisterNewGroupHook(fn func(*Group)) {
-	if newGroupHook != nil {
-		panic("RegisterNewGroupHook called more than once")
-	}
-	newGroupHook = fn
-}
-
-// RegisterServerStart registers a hook that is run when the first
-// group is created.
-func RegisterServerStart(fn func()) {
-	if initPeerServer != nil {
-		panic("RegisterServerStart called more than once")
-	}
-	initPeerServer = fn
-}
-
-func callInitPeerServer() {
-	if initPeerServer != nil {
-		initPeerServer()
-	}
-}
-
-// A Group is a cache namespace and associated data loaded spread over
-// a group of 1 or more machines.
-type Group struct {
-	name       string
-	getter     Getter
-	peersOnce  sync.Once
-	peers      PeerPicker
-	cacheBytes int64 // limit for sum of mainCache and hotCache size
-
-	// mainCache is a cache of the keys for which this process
-	// (amongst its peers) is authoritative. That is, this cache
-	// contains keys which consistent hash on to this process's
-	// peer number.
-	mainCache cache
-
-	// hotCache contains keys/values for which this peer is not
-	// authoritative (otherwise they would be in mainCache), but
-	// are popular enough to warrant mirroring in this process to
-	// avoid going over the network to fetch from a peer.  Having
-	// a hotCache avoids network hotspotting, where a peer's
-	// network card could become the bottleneck on a popular key.
-	// This cache is used sparingly to maximize the total number
-	// of key/value pairs that can be stored globally.
-	hotCache cache
-
-	// loadGroup ensures that each key is only fetched once
-	// (either locally or remotely), regardless of the number of
-	// concurrent callers.
-	loadGroup flightGroup
-
-	// Stats are statistics on the group.
-	Stats Stats
-}
-
-// flightGroup is defined as an interface which flightgroup.Group
-// satisfies.  We define this so that we may test with an alternate
-// implementation.
-type flightGroup interface {
-	// Done is called when Do is done.
-	Do(key string, fn func() (interface{}, error)) (interface{}, error)
-}
-
-// Stats are per-group statistics.
-type Stats struct {
-	Gets           AtomicInt // any Get request, including from peers
-	CacheHits      AtomicInt // either cache was good
-	PeerLoads      AtomicInt // either remote load or remote cache hit (not an error)
-	PeerErrors     AtomicInt
-	Loads          AtomicInt // (gets - cacheHits)
-	LoadsDeduped   AtomicInt // after singleflight
-	LocalLoads     AtomicInt // total good local loads
-	LocalLoadErrs  AtomicInt // total bad local loads
-	ServerRequests AtomicInt // gets that came over the network from peers
-}
-
-// Name returns the name of the group.
-func (g *Group) Name() string {
-	return g.name
-}
-
-func (g *Group) initPeers() {
-	if g.peers == nil {
-		g.peers = getPeers()
-	}
-}
-
-func (g *Group) Get(ctx Context, key string, dest Sink) error {
-	g.peersOnce.Do(g.initPeers)
-	g.Stats.Gets.Add(1)
-	if dest == nil {
-		return errors.New("groupcache: nil dest Sink")
-	}
-	value, cacheHit := g.lookupCache(key)
-
-	if cacheHit {
-		g.Stats.CacheHits.Add(1)
-		return setSinkView(dest, value)
-	}
-
-	// Optimization to avoid double unmarshalling or copying: keep
-	// track of whether the dest was already populated. One caller
-	// (if local) will set this; the losers will not. The common
-	// case will likely be one caller.
-	destPopulated := false
-	value, destPopulated, err := g.load(ctx, key, dest)
-	if err != nil {
-		return err
-	}
-	if destPopulated {
-		return nil
-	}
-	return setSinkView(dest, value)
-}
-
-// load loads key either by invoking the getter locally or by sending it to another machine.
-func (g *Group) load(ctx Context, key string, dest Sink) (value ByteView, destPopulated bool, err error) {
-	g.Stats.Loads.Add(1)
-	viewi, err := g.loadGroup.Do(key, func() (interface{}, error) {
-		// Check the cache again because singleflight can only dedup calls
-		// that overlap concurrently.  It's possible for 2 concurrent
-		// requests to miss the cache, resulting in 2 load() calls.  An
-		// unfortunate goroutine scheduling would result in this callback
-		// being run twice, serially.  If we don't check the cache again,
-		// cache.nbytes would be incremented below even though there will
-		// be only one entry for this key.
-		//
-		// Consider the following serialized event ordering for two
-		// goroutines in which this callback gets called twice for hte
-		// same key:
-		// 1: Get("key")
-		// 2: Get("key")
-		// 1: lookupCache("key")
-		// 2: lookupCache("key")
-		// 1: load("key")
-		// 2: load("key")
-		// 1: loadGroup.Do("key", fn)
-		// 1: fn()
-		// 2: loadGroup.Do("key", fn)
-		// 2: fn()
-		if value, cacheHit := g.lookupCache(key); cacheHit {
-			g.Stats.CacheHits.Add(1)
-			return value, nil
-		}
-		g.Stats.LoadsDeduped.Add(1)
-		var value ByteView
-		var err error
-		if peer, ok := g.peers.PickPeer(key); ok {
-			value, err = g.getFromPeer(ctx, peer, key)
-			if err == nil {
-				g.Stats.PeerLoads.Add(1)
-				return value, nil
-			}
-			g.Stats.PeerErrors.Add(1)
-			// TODO(bradfitz): log the peer's error? keep
-			// log of the past few for /groupcachez?  It's
-			// probably boring (normal task movement), so not
-			// worth logging I imagine.
-		}
-		value, err = g.getLocally(ctx, key, dest)
-		if err != nil {
-			g.Stats.LocalLoadErrs.Add(1)
-			return nil, err
-		}
-		g.Stats.LocalLoads.Add(1)
-		destPopulated = true // only one caller of load gets this return value
-		g.populateCache(key, value, &g.mainCache)
-		return value, nil
-	})
-	if err == nil {
-		value = viewi.(ByteView)
-	}
-	return
-}
-
-func (g *Group) getLocally(ctx Context, key string, dest Sink) (ByteView, error) {
-	err := g.getter.Get(ctx, key, dest)
-	if err != nil {
-		return ByteView{}, err
-	}
-	return dest.view()
-}
-
-func (g *Group) getFromPeer(ctx Context, peer ProtoGetter, key string) (ByteView, error) {
-	req := &pb.GetRequest{
-		Group: &g.name,
-		Key:   &key,
-	}
-	res := &pb.GetResponse{}
-	err := peer.Get(ctx, req, res)
-	if err != nil {
-		return ByteView{}, err
-	}
-	value := ByteView{b: res.Value}
-	// TODO(bradfitz): use res.MinuteQps or something smart to
-	// conditionally populate hotCache.  For now just do it some
-	// percentage of the time.
-	if rand.Intn(10) == 0 {
-		g.populateCache(key, value, &g.hotCache)
-	}
-	return value, nil
-}
-
-func (g *Group) lookupCache(key string) (value ByteView, ok bool) {
-	if g.cacheBytes <= 0 {
-		return
-	}
-	value, ok = g.mainCache.get(key)
-	if ok {
-		return
-	}
-	value, ok = g.hotCache.get(key)
-	return
-}
-
-func (g *Group) populateCache(key string, value ByteView, cache *cache) {
-	if g.cacheBytes <= 0 {
-		return
-	}
-	cache.add(key, value)
-
-	// Evict items from cache(s) if necessary.
-	for {
-		mainBytes := g.mainCache.bytes()
-		hotBytes := g.hotCache.bytes()
-		if mainBytes+hotBytes <= g.cacheBytes {
-			return
-		}
-
-		// TODO(bradfitz): this is good-enough-for-now logic.
-		// It should be something based on measurements and/or
-		// respecting the costs of different resources.
-		victim := &g.mainCache
-		if hotBytes > mainBytes/8 {
-			victim = &g.hotCache
-		}
-		victim.removeOldest()
-	}
-}
-
-// CacheType represents a type of cache.
-type CacheType int
-
-const (
-	// The MainCache is the cache for items that this peer is the
-	// owner for.
-	MainCache CacheType = iota + 1
-
-	// The HotCache is the cache for items that seem popular
-	// enough to replicate to this node, even though it's not the
-	// owner.
-	HotCache
-)
-
-// CacheStats returns stats about the provided cache within the group.
-func (g *Group) CacheStats(which CacheType) CacheStats {
-	switch which {
-	case MainCache:
-		return g.mainCache.stats()
-	case HotCache:
-		return g.hotCache.stats()
-	default:
-		return CacheStats{}
-	}
-}
-
-// cache is a wrapper around an *lru.Cache that adds synchronization,
-// makes values always be ByteView, and counts the size of all keys and
-// values.
-type cache struct {
-	mu         sync.RWMutex
-	nbytes     int64 // of all keys and values
-	lru        *lru.Cache
-	nhit, nget int64
-	nevict     int64 // number of evictions
-}
-
-func (c *cache) stats() CacheStats {
-	c.mu.RLock()
-	defer c.mu.RUnlock()
-	return CacheStats{
-		Bytes:     c.nbytes,
-		Items:     c.itemsLocked(),
-		Gets:      c.nget,
-		Hits:      c.nhit,
-		Evictions: c.nevict,
-	}
-}
-
-func (c *cache) add(key string, value ByteView) {
-	c.mu.Lock()
-	defer c.mu.Unlock()
-	if c.lru == nil {
-		c.lru = &lru.Cache{
-			OnEvicted: func(key lru.Key, value interface{}) {
-				val := value.(ByteView)
-				c.nbytes -= int64(len(key.(string))) + int64(val.Len())
-				c.nevict++
-			},
-		}
-	}
-	c.lru.Add(key, value)
-	c.nbytes += int64(len(key)) + int64(value.Len())
-}
-
-func (c *cache) get(key string) (value ByteView, ok bool) {
-	c.mu.Lock()
-	defer c.mu.Unlock()
-	c.nget++
-	if c.lru == nil {
-		return
-	}
-	vi, ok := c.lru.Get(key)
-	if !ok {
-		return
-	}
-	c.nhit++
-	return vi.(ByteView), true
-}
-
-func (c *cache) removeOldest() {
-	c.mu.Lock()
-	defer c.mu.Unlock()
-	if c.lru != nil {
-		c.lru.RemoveOldest()
-	}
-}
-
-func (c *cache) bytes() int64 {
-	c.mu.RLock()
-	defer c.mu.RUnlock()
-	return c.nbytes
-}
-
-func (c *cache) items() int64 {
-	c.mu.RLock()
-	defer c.mu.RUnlock()
-	return c.itemsLocked()
-}
-
-func (c *cache) itemsLocked() int64 {
-	if c.lru == nil {
-		return 0
-	}
-	return int64(c.lru.Len())
-}
-
-// An AtomicInt is an int64 to be accessed atomically.
-type AtomicInt int64
-
-// Add atomically adds n to i.
-func (i *AtomicInt) Add(n int64) {
-	atomic.AddInt64((*int64)(i), n)
-}
-
-// Get atomically gets the value of i.
-func (i *AtomicInt) Get() int64 {
-	return atomic.LoadInt64((*int64)(i))
-}
-
-func (i *AtomicInt) String() string {
-	return strconv.FormatInt(i.Get(), 10)
-}
-
-// CacheStats are returned by stats accessors on Group.
-type CacheStats struct {
-	Bytes     int64
-	Items     int64
-	Gets      int64
-	Hits      int64
-	Evictions int64
-}

vendor/github.com/golang/groupcache/http.go

@@ -1,227 +0,0 @@
-/*
-Copyright 2013 Google Inc.
-
-Licensed under the Apache License, Version 2.0 (the "License");
-you may not use this file except in compliance with the License.
-You may obtain a copy of the License at
-
-     http://www.apache.org/licenses/LICENSE-2.0
-
-Unless required by applicable law or agreed to in writing, software
-distributed under the License is distributed on an "AS IS" BASIS,
-WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-See the License for the specific language governing permissions and
-limitations under the License.
-*/
-
-package groupcache
-
-import (
-	"bytes"
-	"fmt"
-	"io"
-	"net/http"
-	"net/url"
-	"strings"
-	"sync"
-
-	"github.com/golang/groupcache/consistenthash"
-	pb "github.com/golang/groupcache/groupcachepb"
-	"github.com/golang/protobuf/proto"
-)
-
-const defaultBasePath = "/_groupcache/"
-
-const defaultReplicas = 50
-
-// HTTPPool implements PeerPicker for a pool of HTTP peers.
-type HTTPPool struct {
-	// Context optionally specifies a context for the server to use when it
-	// receives a request.
-	// If nil, the server uses a nil Context.
-	Context func(*http.Request) Context
-
-	// Transport optionally specifies an http.RoundTripper for the client
-	// to use when it makes a request.
-	// If nil, the client uses http.DefaultTransport.
-	Transport func(Context) http.RoundTripper
-
-	// this peer's base URL, e.g. "https://example.net:8000"
-	self string
-
-	// opts specifies the options.
-	opts HTTPPoolOptions
-
-	mu          sync.Mutex // guards peers and httpGetters
-	peers       *consistenthash.Map
-	httpGetters map[string]*httpGetter // keyed by e.g. "http://10.0.0.2:8008"
-}
-
-// HTTPPoolOptions are the configurations of a HTTPPool.
-type HTTPPoolOptions struct {
-	// BasePath specifies the HTTP path that will serve groupcache requests.
-	// If blank, it defaults to "/_groupcache/".
-	BasePath string
-
-	// Replicas specifies the number of key replicas on the consistent hash.
-	// If blank, it defaults to 50.
-	Replicas int
-
-	// HashFn specifies the hash function of the consistent hash.
-	// If blank, it defaults to crc32.ChecksumIEEE.
-	HashFn consistenthash.Hash
-}
-
-// NewHTTPPool initializes an HTTP pool of peers, and registers itself as a PeerPicker.
-// For convenience, it also registers itself as an http.Handler with http.DefaultServeMux.
-// The self argument be a valid base URL that points to the current server,
-// for example "http://example.net:8000".
-func NewHTTPPool(self string) *HTTPPool {
-	p := NewHTTPPoolOpts(self, nil)
-	http.Handle(p.opts.BasePath, p)
-	return p
-}
-
-var httpPoolMade bool
-
-// NewHTTPPoolOpts initializes an HTTP pool of peers with the given options.
-// Unlike NewHTTPPool, this function does not register the created pool as an HTTP handler.
-// The returned *HTTPPool implements http.Handler and must be registered using http.Handle.
-func NewHTTPPoolOpts(self string, o *HTTPPoolOptions) *HTTPPool {
-	if httpPoolMade {
-		panic("groupcache: NewHTTPPool must be called only once")
-	}
-	httpPoolMade = true
-
-	p := &HTTPPool{
-		self:        self,
-		httpGetters: make(map[string]*httpGetter),
-	}
-	if o != nil {
-		p.opts = *o
-	}
-	if p.opts.BasePath == "" {
-		p.opts.BasePath = defaultBasePath
-	}
-	if p.opts.Replicas == 0 {
-		p.opts.Replicas = defaultReplicas
-	}
-	p.peers = consistenthash.New(p.opts.Replicas, p.opts.HashFn)
-
-	RegisterPeerPicker(func() PeerPicker { return p })
-	return p
-}
-
-// Set updates the pool's list of peers.
-// Each peer value should be a valid base URL,
-// for example "http://example.net:8000".
-func (p *HTTPPool) Set(peers ...string) {
-	p.mu.Lock()
-	defer p.mu.Unlock()
-	p.peers = consistenthash.New(p.opts.Replicas, p.opts.HashFn)
-	p.peers.Add(peers...)
-	p.httpGetters = make(map[string]*httpGetter, len(peers))
-	for _, peer := range peers {
-		p.httpGetters[peer] = &httpGetter{transport: p.Transport, baseURL: peer + p.opts.BasePath}
-	}
-}
-
-func (p *HTTPPool) PickPeer(key string) (ProtoGetter, bool) {
-	p.mu.Lock()
-	defer p.mu.Unlock()
-	if p.peers.IsEmpty() {
-		return nil, false
-	}
-	if peer := p.peers.Get(key); peer != p.self {
-		return p.httpGetters[peer], true
-	}
-	return nil, false
-}
-
-func (p *HTTPPool) ServeHTTP(w http.ResponseWriter, r *http.Request) {
-	// Parse request.
-	if !strings.HasPrefix(r.URL.Path, p.opts.BasePath) {
-		panic("HTTPPool serving unexpected path: " + r.URL.Path)
-	}
-	parts := strings.SplitN(r.URL.Path[len(p.opts.BasePath):], "/", 2)
-	if len(parts) != 2 {
-		http.Error(w, "bad request", http.StatusBadRequest)
-		return
-	}
-	groupName := parts[0]
-	key := parts[1]
-
-	// Fetch the value for this group/key.
-	group := GetGroup(groupName)
-	if group == nil {
-		http.Error(w, "no such group: "+groupName, http.StatusNotFound)
-		return
-	}
-	var ctx Context
-	if p.Context != nil {
-		ctx = p.Context(r)
-	}
-
-	group.Stats.ServerRequests.Add(1)
-	var value []byte
-	err := group.Get(ctx, key, AllocatingByteSliceSink(&value))
-	if err != nil {
-		http.Error(w, err.Error(), http.StatusInternalServerError)
-		return
-	}
-
-	// Write the value to the response body as a proto message.
-	body, err := proto.Marshal(&pb.GetResponse{Value: value})
-	if err != nil {
-		http.Error(w, err.Error(), http.StatusInternalServerError)
-		return
-	}
-	w.Header().Set("Content-Type", "application/x-protobuf")
-	w.Write(body)
-}
-
-type httpGetter struct {
-	transport func(Context) http.RoundTripper
-	baseURL   string
-}
-
-var bufferPool = sync.Pool{
-	New: func() interface{} { return new(bytes.Buffer) },
-}
-
-func (h *httpGetter) Get(context Context, in *pb.GetRequest, out *pb.GetResponse) error {
-	u := fmt.Sprintf(
-		"%v%v/%v",
-		h.baseURL,
-		url.QueryEscape(in.GetGroup()),
-		url.QueryEscape(in.GetKey()),
-	)
-	req, err := http.NewRequest("GET", u, nil)
-	if err != nil {
-		return err
-	}
-	tr := http.DefaultTransport
-	if h.transport != nil {
-		tr = h.transport(context)
-	}
-	res, err := tr.RoundTrip(req)
-	if err != nil {
-		return err
-	}
-	defer res.Body.Close()
-	if res.StatusCode != http.StatusOK {
-		return fmt.Errorf("server returned: %v", res.Status)
-	}
-	b := bufferPool.Get().(*bytes.Buffer)
-	b.Reset()
-	defer bufferPool.Put(b)
-	_, err = io.Copy(b, res.Body)
-	if err != nil {
-		return fmt.Errorf("reading response body: %v", err)
-	}
-	err = proto.Unmarshal(b.Bytes(), out)
-	if err != nil {
-		return fmt.Errorf("decoding response body: %v", err)
-	}
-	return nil
-}

vendor/github.com/golang/groupcache/peers.go

@@ -1,71 +0,0 @@
-/*
-Copyright 2012 Google Inc.
-
-Licensed under the Apache License, Version 2.0 (the "License");
-you may not use this file except in compliance with the License.
-You may obtain a copy of the License at
-
-     http://www.apache.org/licenses/LICENSE-2.0
-
-Unless required by applicable law or agreed to in writing, software
-distributed under the License is distributed on an "AS IS" BASIS,
-WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-See the License for the specific language governing permissions and
-limitations under the License.
-*/
-
-// peers.go defines how processes find and communicate with their peers.
-
-package groupcache
-
-import (
-	pb "github.com/golang/groupcache/groupcachepb"
-)
-
-// Context is an opaque value passed through calls to the
-// ProtoGetter. It may be nil if your ProtoGetter implementation does
-// not require a context.
-type Context interface{}
-
-// ProtoGetter is the interface that must be implemented by a peer.
-type ProtoGetter interface {
-	Get(context Context, in *pb.GetRequest, out *pb.GetResponse) error
-}
-
-// PeerPicker is the interface that must be implemented to locate
-// the peer that owns a specific key.
-type PeerPicker interface {
-	// PickPeer returns the peer that owns the specific key
-	// and true to indicate that a remote peer was nominated.
-	// It returns nil, false if the key owner is the current peer.
-	PickPeer(key string) (peer ProtoGetter, ok bool)
-}
-
-// NoPeers is an implementation of PeerPicker that never finds a peer.
-type NoPeers struct{}
-
-func (NoPeers) PickPeer(key string) (peer ProtoGetter, ok bool) { return }
-
-var (
-	portPicker func() PeerPicker
-)
-
-// RegisterPeerPicker registers the peer initialization function.
-// It is called once, when the first group is created.
-func RegisterPeerPicker(fn func() PeerPicker) {
-	if portPicker != nil {
-		panic("RegisterPeerPicker called more than once")
-	}
-	portPicker = fn
-}
-
-func getPeers() PeerPicker {
-	if portPicker == nil {
-		return NoPeers{}
-	}
-	pk := portPicker()
-	if pk == nil {
-		pk = NoPeers{}
-	}
-	return pk
-}

vendor/github.com/golang/groupcache/sinks.go

@@ -1,322 +0,0 @@
-/*
-Copyright 2012 Google Inc.
-
-Licensed under the Apache License, Version 2.0 (the "License");
-you may not use this file except in compliance with the License.
-You may obtain a copy of the License at
-
-     http://www.apache.org/licenses/LICENSE-2.0
-
-Unless required by applicable law or agreed to in writing, software
-distributed under the License is distributed on an "AS IS" BASIS,
-WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-See the License for the specific language governing permissions and
-limitations under the License.
-*/
-
-package groupcache
-
-import (
-	"errors"
-
-	"github.com/golang/protobuf/proto"
-)
-
-// A Sink receives data from a Get call.
-//
-// Implementation of Getter must call exactly one of the Set methods
-// on success.
-type Sink interface {
-	// SetString sets the value to s.
-	SetString(s string) error
-
-	// SetBytes sets the value to the contents of v.
-	// The caller retains ownership of v.
-	SetBytes(v []byte) error
-
-	// SetProto sets the value to the encoded version of m.
-	// The caller retains ownership of m.
-	SetProto(m proto.Message) error
-
-	// view returns a frozen view of the bytes for caching.
-	view() (ByteView, error)
-}
-
-func cloneBytes(b []byte) []byte {
-	c := make([]byte, len(b))
-	copy(c, b)
-	return c
-}
-
-func setSinkView(s Sink, v ByteView) error {
-	// A viewSetter is a Sink that can also receive its value from
-	// a ByteView. This is a fast path to minimize copies when the
-	// item was already cached locally in memory (where it's
-	// cached as a ByteView)
-	type viewSetter interface {
-		setView(v ByteView) error
-	}
-	if vs, ok := s.(viewSetter); ok {
-		return vs.setView(v)
-	}
-	if v.b != nil {
-		return s.SetBytes(v.b)
-	}
-	return s.SetString(v.s)
-}
-
-// StringSink returns a Sink that populates the provided string pointer.
-func StringSink(sp *string) Sink {
-	return &stringSink{sp: sp}
-}
-
-type stringSink struct {
-	sp *string
-	v  ByteView
-	// TODO(bradfitz): track whether any Sets were called.
-}
-
-func (s *stringSink) view() (ByteView, error) {
-	// TODO(bradfitz): return an error if no Set was called
-	return s.v, nil
-}
-
-func (s *stringSink) SetString(v string) error {
-	s.v.b = nil
-	s.v.s = v
-	*s.sp = v
-	return nil
-}
-
-func (s *stringSink) SetBytes(v []byte) error {
-	return s.SetString(string(v))
-}
-
-func (s *stringSink) SetProto(m proto.Message) error {
-	b, err := proto.Marshal(m)
-	if err != nil {
-		return err
-	}
-	s.v.b = b
-	*s.sp = string(b)
-	return nil
-}
-
-// ByteViewSink returns a Sink that populates a ByteView.
-func ByteViewSink(dst *ByteView) Sink {
-	if dst == nil {
-		panic("nil dst")
-	}
-	return &byteViewSink{dst: dst}
-}
-
-type byteViewSink struct {
-	dst *ByteView
-
-	// if this code ever ends up tracking that at least one set*
-	// method was called, don't make it an error to call set
-	// methods multiple times. Lorry's payload.go does that, and
-	// it makes sense. The comment at the top of this file about
-	// "exactly one of the Set methods" is overly strict. We
-	// really care about at least once (in a handler), but if
-	// multiple handlers fail (or multiple functions in a program
-	// using a Sink), it's okay to re-use the same one.
-}
-
-func (s *byteViewSink) setView(v ByteView) error {
-	*s.dst = v
-	return nil
-}
-
-func (s *byteViewSink) view() (ByteView, error) {
-	return *s.dst, nil
-}
-
-func (s *byteViewSink) SetProto(m proto.Message) error {
-	b, err := proto.Marshal(m)
-	if err != nil {
-		return err
-	}
-	*s.dst = ByteView{b: b}
-	return nil
-}
-
-func (s *byteViewSink) SetBytes(b []byte) error {
-	*s.dst = ByteView{b: cloneBytes(b)}
-	return nil
-}
-
-func (s *byteViewSink) SetString(v string) error {
-	*s.dst = ByteView{s: v}
-	return nil
-}
-
-// ProtoSink returns a sink that unmarshals binary proto values into m.
-func ProtoSink(m proto.Message) Sink {
-	return &protoSink{
-		dst: m,
-	}
-}
-
-type protoSink struct {
-	dst proto.Message // authorative value
-	typ string
-
-	v ByteView // encoded
-}
-
-func (s *protoSink) view() (ByteView, error) {
-	return s.v, nil
-}
-
-func (s *protoSink) SetBytes(b []byte) error {
-	err := proto.Unmarshal(b, s.dst)
-	if err != nil {
-		return err
-	}
-	s.v.b = cloneBytes(b)
-	s.v.s = ""
-	return nil
-}
-
-func (s *protoSink) SetString(v string) error {
-	b := []byte(v)
-	err := proto.Unmarshal(b, s.dst)
-	if err != nil {
-		return err
-	}
-	s.v.b = b
-	s.v.s = ""
-	return nil
-}
-
-func (s *protoSink) SetProto(m proto.Message) error {
-	b, err := proto.Marshal(m)
-	if err != nil {
-		return err
-	}
-	// TODO(bradfitz): optimize for same-task case more and write
-	// right through? would need to document ownership rules at
-	// the same time. but then we could just assign *dst = *m
-	// here. This works for now:
-	err = proto.Unmarshal(b, s.dst)
-	if err != nil {
-		return err
-	}
-	s.v.b = b
-	s.v.s = ""
-	return nil
-}
-
-// AllocatingByteSliceSink returns a Sink that allocates
-// a byte slice to hold the received value and assigns
-// it to *dst. The memory is not retained by groupcache.
-func AllocatingByteSliceSink(dst *[]byte) Sink {
-	return &allocBytesSink{dst: dst}
-}
-
-type allocBytesSink struct {
-	dst *[]byte
-	v   ByteView
-}
-
-func (s *allocBytesSink) view() (ByteView, error) {
-	return s.v, nil
-}
-
-func (s *allocBytesSink) setView(v ByteView) error {
-	if v.b != nil {
-		*s.dst = cloneBytes(v.b)
-	} else {
-		*s.dst = []byte(v.s)
-	}
-	s.v = v
-	return nil
-}
-
-func (s *allocBytesSink) SetProto(m proto.Message) error {
-	b, err := proto.Marshal(m)
-	if err != nil {
-		return err
-	}
-	return s.setBytesOwned(b)
-}
-
-func (s *allocBytesSink) SetBytes(b []byte) error {
-	return s.setBytesOwned(cloneBytes(b))
-}
-
-func (s *allocBytesSink) setBytesOwned(b []byte) error {
-	if s.dst == nil {
-		return errors.New("nil AllocatingByteSliceSink *[]byte dst")
-	}
-	*s.dst = cloneBytes(b) // another copy, protecting the read-only s.v.b view
-	s.v.b = b
-	s.v.s = ""
-	return nil
-}
-
-func (s *allocBytesSink) SetString(v string) error {
-	if s.dst == nil {
-		return errors.New("nil AllocatingByteSliceSink *[]byte dst")
-	}
-	*s.dst = []byte(v)
-	s.v.b = nil
-	s.v.s = v
-	return nil
-}
-
-// TruncatingByteSliceSink returns a Sink that writes up to len(*dst)
-// bytes to *dst. If more bytes are available, they're silently
-// truncated. If fewer bytes are available than len(*dst), *dst
-// is shrunk to fit the number of bytes available.
-func TruncatingByteSliceSink(dst *[]byte) Sink {
-	return &truncBytesSink{dst: dst}
-}
-
-type truncBytesSink struct {
-	dst *[]byte
-	v   ByteView
-}
-
-func (s *truncBytesSink) view() (ByteView, error) {
-	return s.v, nil
-}
-
-func (s *truncBytesSink) SetProto(m proto.Message) error {
-	b, err := proto.Marshal(m)
-	if err != nil {
-		return err
-	}
-	return s.setBytesOwned(b)
-}
-
-func (s *truncBytesSink) SetBytes(b []byte) error {
-	return s.setBytesOwned(cloneBytes(b))
-}
-
-func (s *truncBytesSink) setBytesOwned(b []byte) error {
-	if s.dst == nil {
-		return errors.New("nil TruncatingByteSliceSink *[]byte dst")
-	}
-	n := copy(*s.dst, b)
-	if n < len(*s.dst) {
-		*s.dst = (*s.dst)[:n]
-	}
-	s.v.b = b
-	s.v.s = ""
-	return nil
-}
-
-func (s *truncBytesSink) SetString(v string) error {
-	if s.dst == nil {
-		return errors.New("nil TruncatingByteSliceSink *[]byte dst")
-	}
-	n := copy(*s.dst, v)
-	if n < len(*s.dst) {
-		*s.dst = (*s.dst)[:n]
-	}
-	s.v.b = nil
-	s.v.s = v
-	return nil
-}

vendor/github.com/grpc-ecosystem/grpc-gateway/third_party/googleapis/LICENSE

@@ -0,0 +1,201 @@
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
+      "License" shall mean the terms and conditions for use, reproduction,
+      and distribution as defined by Sections 1 through 9 of this document.
+
+      "Licensor" shall mean the copyright owner or entity authorized by
+      the copyright owner that is granting the License.
+
+      "Legal Entity" shall mean the union of the acting entity and all
+      other entities that control, are controlled by, or are under common
+      control with that entity. For the purposes of this definition,
+      "control" means (i) the power, direct or indirect, to cause the
+      direction or management of such entity, whether by contract or
+      otherwise, or (ii) ownership of fifty percent (50%) or more of the
+      outstanding shares, or (iii) beneficial ownership of such entity.
+
+      "You" (or "Your") shall mean an individual or Legal Entity
+      exercising permissions granted by this License.
+
+      "Source" form shall mean the preferred form for making modifications,
+      including but not limited to software source code, documentation
+      source, and configuration files.
+
+      "Object" form shall mean any form resulting from mechanical
+      transformation or translation of a Source form, including but
+      not limited to compiled object code, generated documentation,
+      and conversions to other media types.
+
+      "Work" shall mean the work of authorship, whether in Source or
+      Object form, made available under the License, as indicated by a
+      copyright notice that is included in or attached to the work
+      (an example is provided in the Appendix below).
+
+      "Derivative Works" shall mean any work, whether in Source or Object
+      form, that is based on (or derived from) the Work and for which the
+      editorial revisions, annotations, elaborations, or other modifications
+      represent, as a whole, an original work of authorship. For the purposes
+      of this License, Derivative Works shall not include works that remain
+      separable from, or merely link (or bind by name) to the interfaces of,
+      the Work and Derivative Works thereof.
+
+      "Contribution" shall mean any work of authorship, including
+      the original version of the Work and any modifications or additions
+      to that Work or Derivative Works thereof, that is intentionally
+      submitted to Licensor for inclusion in the Work by the copyright owner
+      or by an individual or Legal Entity authorized to submit on behalf of
+      the copyright owner. For the purposes of this definition, "submitted"
+      means any form of electronic, verbal, or written communication sent
+      to the Licensor or its representatives, including but not limited to
+      communication on electronic mailing lists, source code control systems,
+      and issue tracking systems that are managed by, or on behalf of, the
+      Licensor for the purpose of discussing and improving the Work, but
+      excluding communication that is conspicuously marked or otherwise
+      designated in writing by the copyright owner as "Not a Contribution."
+
+      "Contributor" shall mean Licensor and any individual or Legal Entity
+      on behalf of whom a Contribution has been received by Licensor and
+      subsequently incorporated within the Work.
+
+   2. Grant of Copyright License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      copyright license to reproduce, prepare Derivative Works of,
+      publicly display, publicly perform, sublicense, and distribute the
+      Work and such Derivative Works in Source or Object form.
+
+   3. Grant of Patent License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      (except as stated in this section) patent license to make, have made,
+      use, offer to sell, sell, import, and otherwise transfer the Work,
+      where such license applies only to those patent claims licensable
+      by such Contributor that are necessarily infringed by their
+      Contribution(s) alone or by combination of their Contribution(s)
+      with the Work to which such Contribution(s) was submitted. If You
+      institute patent litigation against any entity (including a
+      cross-claim or counterclaim in a lawsuit) alleging that the Work
+      or a Contribution incorporated within the Work constitutes direct
+      or contributory patent infringement, then any patent licenses
+      granted to You under this License for that Work shall terminate
+      as of the date such litigation is filed.
+
+   4. Redistribution. You may reproduce and distribute copies of the
+      Work or Derivative Works thereof in any medium, with or without
+      modifications, and in Source or Object form, provided that You
+      meet the following conditions:
+
+      (a) You must give any other recipients of the Work or
+          Derivative Works a copy of this License; and
+
+      (b) You must cause any modified files to carry prominent notices
+          stating that You changed the files; and
+
+      (c) You must retain, in the Source form of any Derivative Works
+          that You distribute, all copyright, patent, trademark, and
+          attribution notices from the Source form of the Work,
+          excluding those notices that do not pertain to any part of
+          the Derivative Works; and
+
+      (d) If the Work includes a "NOTICE" text file as part of its
+          distribution, then any Derivative Works that You distribute must
+          include a readable copy of the attribution notices contained
+          within such NOTICE file, excluding those notices that do not
+          pertain to any part of the Derivative Works, in at least one
+          of the following places: within a NOTICE text file distributed
+          as part of the Derivative Works; within the Source form or
+          documentation, if provided along with the Derivative Works; or,
+          within a display generated by the Derivative Works, if and
+          wherever such third-party notices normally appear. The contents
+          of the NOTICE file are for informational purposes only and
+          do not modify the License. You may add Your own attribution
+          notices within Derivative Works that You distribute, alongside
+          or as an addendum to the NOTICE text from the Work, provided
+          that such additional attribution notices cannot be construed
+          as modifying the License.
+
+      You may add Your own copyright statement to Your modifications and
+      may provide additional or different license terms and conditions
+      for use, reproduction, or distribution of Your modifications, or
+      for any such Derivative Works as a whole, provided Your use,
+      reproduction, and distribution of the Work otherwise complies with
+      the conditions stated in this License.
+
+   5. Submission of Contributions. Unless You explicitly state otherwise,
+      any Contribution intentionally submitted for inclusion in the Work
+      by You to the Licensor shall be under the terms and conditions of
+      this License, without any additional terms or conditions.
+      Notwithstanding the above, nothing herein shall supersede or modify
+      the terms of any separate license agreement you may have executed
+      with Licensor regarding such Contributions.
+
+   6. Trademarks. This License does not grant permission to use the trade
+      names, trademarks, service marks, or product names of the Licensor,
+      except as required for reasonable and customary use in describing the
+      origin of the Work and reproducing the content of the NOTICE file.
+
+   7. Disclaimer of Warranty. Unless required by applicable law or
+      agreed to in writing, Licensor provides the Work (and each
+      Contributor provides its Contributions) on an "AS IS" BASIS,
+      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+      implied, including, without limitation, any warranties or conditions
+      of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
+      PARTICULAR PURPOSE. You are solely responsible for determining the
+      appropriateness of using or redistributing the Work and assume any
+      risks associated with Your exercise of permissions under this License.
+
+   8. Limitation of Liability. In no event and under no legal theory,
+      whether in tort (including negligence), contract, or otherwise,
+      unless required by applicable law (such as deliberate and grossly
+      negligent acts) or agreed to in writing, shall any Contributor be
+      liable to You for damages, including any direct, indirect, special,
+      incidental, or consequential damages of any character arising as a
+      result of this License or out of the use or inability to use the
+      Work (including but not limited to damages for loss of goodwill,
+      work stoppage, computer failure or malfunction, or any and all
+      other commercial damages or losses), even if such Contributor
+      has been advised of the possibility of such damages.
+
+   9. Accepting Warranty or Additional Liability. While redistributing
+      the Work or Derivative Works thereof, You may choose to offer,
+      and charge a fee for, acceptance of support, warranty, indemnity,
+      or other liability obligations and/or rights consistent with this
+      License. However, in accepting such obligations, You may act only
+      on Your own behalf and on Your sole responsibility, not on behalf
+      of any other Contributor, and only if You agree to indemnify,
+      defend, and hold each Contributor harmless for any liability
+      incurred by, or claims asserted against, such Contributor by reason
+      of your accepting any such warranty or additional liability.
+
+   END OF TERMS AND CONDITIONS
+
+   APPENDIX: How to apply the Apache License to your work.
+
+      To apply the Apache License to your work, attach the following
+      boilerplate notice, with the fields enclosed by brackets "[]"
+      replaced with your own identifying information. (Don't include
+      the brackets!)  The text should be enclosed in the appropriate
+      comment syntax for the file format. We also recommend that a
+      file or class name and description of purpose be included on the
+      same "printed page" as the copyright notice for easier
+      identification within third-party archives.
+
+   Copyright [yyyy] [name of copyright owner]
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.

vendor/github.com/prometheus/client_model/ruby/LICENSE

@@ -0,0 +1,201 @@
+                              Apache License
+                        Version 2.0, January 2004
+                     http://www.apache.org/licenses/
+
+TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+1. Definitions.
+
+   "License" shall mean the terms and conditions for use, reproduction,
+   and distribution as defined by Sections 1 through 9 of this document.
+
+   "Licensor" shall mean the copyright owner or entity authorized by
+   the copyright owner that is granting the License.
+
+   "Legal Entity" shall mean the union of the acting entity and all
+   other entities that control, are controlled by, or are under common
+   control with that entity. For the purposes of this definition,
+   "control" means (i) the power, direct or indirect, to cause the
+   direction or management of such entity, whether by contract or
+   otherwise, or (ii) ownership of fifty percent (50%) or more of the
+   outstanding shares, or (iii) beneficial ownership of such entity.
+
+   "You" (or "Your") shall mean an individual or Legal Entity
+   exercising permissions granted by this License.
+
+   "Source" form shall mean the preferred form for making modifications,
+   including but not limited to software source code, documentation
+   source, and configuration files.
+
+   "Object" form shall mean any form resulting from mechanical
+   transformation or translation of a Source form, including but
+   not limited to compiled object code, generated documentation,
+   and conversions to other media types.
+
+   "Work" shall mean the work of authorship, whether in Source or
+   Object form, made available under the License, as indicated by a
+   copyright notice that is included in or attached to the work
+   (an example is provided in the Appendix below).
+
+   "Derivative Works" shall mean any work, whether in Source or Object
+   form, that is based on (or derived from) the Work and for which the
+   editorial revisions, annotations, elaborations, or other modifications
+   represent, as a whole, an original work of authorship. For the purposes
+   of this License, Derivative Works shall not include works that remain
+   separable from, or merely link (or bind by name) to the interfaces of,
+   the Work and Derivative Works thereof.
+
+   "Contribution" shall mean any work of authorship, including
+   the original version of the Work and any modifications or additions
+   to that Work or Derivative Works thereof, that is intentionally
+   submitted to Licensor for inclusion in the Work by the copyright owner
+   or by an individual or Legal Entity authorized to submit on behalf of
+   the copyright owner. For the purposes of this definition, "submitted"
+   means any form of electronic, verbal, or written communication sent
+   to the Licensor or its representatives, including but not limited to
+   communication on electronic mailing lists, source code control systems,
+   and issue tracking systems that are managed by, or on behalf of, the
+   Licensor for the purpose of discussing and improving the Work, but
+   excluding communication that is conspicuously marked or otherwise
+   designated in writing by the copyright owner as "Not a Contribution."
+
+   "Contributor" shall mean Licensor and any individual or Legal Entity
+   on behalf of whom a Contribution has been received by Licensor and
+   subsequently incorporated within the Work.
+
+2. Grant of Copyright License. Subject to the terms and conditions of
+   this License, each Contributor hereby grants to You a perpetual,
+   worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+   copyright license to reproduce, prepare Derivative Works of,
+   publicly display, publicly perform, sublicense, and distribute the
+   Work and such Derivative Works in Source or Object form.
+
+3. Grant of Patent License. Subject to the terms and conditions of
+   this License, each Contributor hereby grants to You a perpetual,
+   worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+   (except as stated in this section) patent license to make, have made,
+   use, offer to sell, sell, import, and otherwise transfer the Work,
+   where such license applies only to those patent claims licensable
+   by such Contributor that are necessarily infringed by their
+   Contribution(s) alone or by combination of their Contribution(s)
+   with the Work to which such Contribution(s) was submitted. If You
+   institute patent litigation against any entity (including a
+   cross-claim or counterclaim in a lawsuit) alleging that the Work
+   or a Contribution incorporated within the Work constitutes direct
+   or contributory patent infringement, then any patent licenses
+   granted to You under this License for that Work shall terminate
+   as of the date such litigation is filed.
+
+4. Redistribution. You may reproduce and distribute copies of the
+   Work or Derivative Works thereof in any medium, with or without
+   modifications, and in Source or Object form, provided that You
+   meet the following conditions:
+
+   (a) You must give any other recipients of the Work or
+       Derivative Works a copy of this License; and
+
+   (b) You must cause any modified files to carry prominent notices
+       stating that You changed the files; and
+
+   (c) You must retain, in the Source form of any Derivative Works
+       that You distribute, all copyright, patent, trademark, and
+       attribution notices from the Source form of the Work,
+       excluding those notices that do not pertain to any part of
+       the Derivative Works; and
+
+   (d) If the Work includes a "NOTICE" text file as part of its
+       distribution, then any Derivative Works that You distribute must
+       include a readable copy of the attribution notices contained
+       within such NOTICE file, excluding those notices that do not
+       pertain to any part of the Derivative Works, in at least one
+       of the following places: within a NOTICE text file distributed
+       as part of the Derivative Works; within the Source form or
+       documentation, if provided along with the Derivative Works; or,
+       within a display generated by the Derivative Works, if and
+       wherever such third-party notices normally appear. The contents
+       of the NOTICE file are for informational purposes only and
+       do not modify the License. You may add Your own attribution
+       notices within Derivative Works that You distribute, alongside
+       or as an addendum to the NOTICE text from the Work, provided
+       that such additional attribution notices cannot be construed
+       as modifying the License.
+
+   You may add Your own copyright statement to Your modifications and
+   may provide additional or different license terms and conditions
+   for use, reproduction, or distribution of Your modifications, or
+   for any such Derivative Works as a whole, provided Your use,
+   reproduction, and distribution of the Work otherwise complies with
+   the conditions stated in this License.
+
+5. Submission of Contributions. Unless You explicitly state otherwise,
+   any Contribution intentionally submitted for inclusion in the Work
+   by You to the Licensor shall be under the terms and conditions of
+   this License, without any additional terms or conditions.
+   Notwithstanding the above, nothing herein shall supersede or modify
+   the terms of any separate license agreement you may have executed
+   with Licensor regarding such Contributions.
+
+6. Trademarks. This License does not grant permission to use the trade
+   names, trademarks, service marks, or product names of the Licensor,
+   except as required for reasonable and customary use in describing the
+   origin of the Work and reproducing the content of the NOTICE file.
+
+7. Disclaimer of Warranty. Unless required by applicable law or
+   agreed to in writing, Licensor provides the Work (and each
+   Contributor provides its Contributions) on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+   implied, including, without limitation, any warranties or conditions
+   of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
+   PARTICULAR PURPOSE. You are solely responsible for determining the
+   appropriateness of using or redistributing the Work and assume any
+   risks associated with Your exercise of permissions under this License.
+
+8. Limitation of Liability. In no event and under no legal theory,
+   whether in tort (including negligence), contract, or otherwise,
+   unless required by applicable law (such as deliberate and grossly
+   negligent acts) or agreed to in writing, shall any Contributor be
+   liable to You for damages, including any direct, indirect, special,
+   incidental, or consequential damages of any character arising as a
+   result of this License or out of the use or inability to use the
+   Work (including but not limited to damages for loss of goodwill,
+   work stoppage, computer failure or malfunction, or any and all
+   other commercial damages or losses), even if such Contributor
+   has been advised of the possibility of such damages.
+
+9. Accepting Warranty or Additional Liability. While redistributing
+   the Work or Derivative Works thereof, You may choose to offer,
+   and charge a fee for, acceptance of support, warranty, indemnity,
+   or other liability obligations and/or rights consistent with this
+   License. However, in accepting such obligations, You may act only
+   on Your own behalf and on Your sole responsibility, not on behalf
+   of any other Contributor, and only if You agree to indemnify,
+   defend, and hold each Contributor harmless for any liability
+   incurred by, or claims asserted against, such Contributor by reason
+   of your accepting any such warranty or additional liability.
+
+END OF TERMS AND CONDITIONS
+
+APPENDIX: How to apply the Apache License to your work.
+
+   To apply the Apache License to your work, attach the following
+   boilerplate notice, with the fields enclosed by brackets "[]"
+   replaced with your own identifying information. (Don't include
+   the brackets!)  The text should be enclosed in the appropriate
+   comment syntax for the file format. We also recommend that a
+   file or class name and description of purpose be included on the
+   same "printed page" as the copyright notice for easier
+   identification within third-party archives.
+
+Copyright [yyyy] [name of copyright owner]
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.

vendor/github.com/spf13/cobra/cobra/cmd/licenses.go

@@ -0,0 +1,1133 @@
+// Copyright © 2015 Steve Francia <spf@spf13.com>.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Parts inspired by https://github.com/ryanuber/go-license
+
+package cmd
+
+import "strings"
+
+//Licenses contains all possible licenses a user can chose from
+var Licenses map[string]License
+
+//License represents a software license agreement, containing the Name of
+// the license, its possible matches (on the command line as given to cobra)
+// the header to be used with each file on the file's creating, and the text
+// of the license
+type License struct {
+	Name            string   // The type of license in use
+	PossibleMatches []string // Similar names to guess
+	Text            string   // License text data
+	Header          string   // License header for source files
+}
+
+// given a license name (in), try to match the license indicated
+func matchLicense(in string) string {
+	for key, lic := range Licenses {
+		for _, match := range lic.PossibleMatches {
+			if strings.EqualFold(in, match) {
+				return key
+			}
+		}
+	}
+	return ""
+}
+
+func init() {
+	Licenses = make(map[string]License)
+
+	Licenses["apache"] = License{
+		Name:            "Apache 2.0",
+		PossibleMatches: []string{"apache", "apache20", "apache 2.0", "apache2.0", "apache-2.0"},
+		Header: `
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.`,
+		Text: `
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
+      "License" shall mean the terms and conditions for use, reproduction,
+      and distribution as defined by Sections 1 through 9 of this document.
+
+      "Licensor" shall mean the copyright owner or entity authorized by
+      the copyright owner that is granting the License.
+
+      "Legal Entity" shall mean the union of the acting entity and all
+      other entities that control, are controlled by, or are under common
+      control with that entity. For the purposes of this definition,
+      "control" means (i) the power, direct or indirect, to cause the
+      direction or management of such entity, whether by contract or
+      otherwise, or (ii) ownership of fifty percent (50%) or more of the
+      outstanding shares, or (iii) beneficial ownership of such entity.
+
+      "You" (or "Your") shall mean an individual or Legal Entity
+      exercising permissions granted by this License.
+
+      "Source" form shall mean the preferred form for making modifications,
+      including but not limited to software source code, documentation
+      source, and configuration files.
+
+      "Object" form shall mean any form resulting from mechanical
+      transformation or translation of a Source form, including but
+      not limited to compiled object code, generated documentation,
+      and conversions to other media types.
+
+      "Work" shall mean the work of authorship, whether in Source or
+      Object form, made available under the License, as indicated by a
+      copyright notice that is included in or attached to the work
+      (an example is provided in the Appendix below).
+
+      "Derivative Works" shall mean any work, whether in Source or Object
+      form, that is based on (or derived from) the Work and for which the
+      editorial revisions, annotations, elaborations, or other modifications
+      represent, as a whole, an original work of authorship. For the purposes
+      of this License, Derivative Works shall not include works that remain
+      separable from, or merely link (or bind by name) to the interfaces of,
+      the Work and Derivative Works thereof.
+
+      "Contribution" shall mean any work of authorship, including
+      the original version of the Work and any modifications or additions
+      to that Work or Derivative Works thereof, that is intentionally
+      submitted to Licensor for inclusion in the Work by the copyright owner
+      or by an individual or Legal Entity authorized to submit on behalf of
+      the copyright owner. For the purposes of this definition, "submitted"
+      means any form of electronic, verbal, or written communication sent
+      to the Licensor or its representatives, including but not limited to
+      communication on electronic mailing lists, source code control systems,
+      and issue tracking systems that are managed by, or on behalf of, the
+      Licensor for the purpose of discussing and improving the Work, but
+      excluding communication that is conspicuously marked or otherwise
+      designated in writing by the copyright owner as "Not a Contribution."
+
+      "Contributor" shall mean Licensor and any individual or Legal Entity
+      on behalf of whom a Contribution has been received by Licensor and
+      subsequently incorporated within the Work.
+
+   2. Grant of Copyright License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      copyright license to reproduce, prepare Derivative Works of,
+      publicly display, publicly perform, sublicense, and distribute the
+      Work and such Derivative Works in Source or Object form.
+
+   3. Grant of Patent License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      (except as stated in this section) patent license to make, have made,
+      use, offer to sell, sell, import, and otherwise transfer the Work,
+      where such license applies only to those patent claims licensable
+      by such Contributor that are necessarily infringed by their
+      Contribution(s) alone or by combination of their Contribution(s)
+      with the Work to which such Contribution(s) was submitted. If You
+      institute patent litigation against any entity (including a
+      cross-claim or counterclaim in a lawsuit) alleging that the Work
+      or a Contribution incorporated within the Work constitutes direct
+      or contributory patent infringement, then any patent licenses
+      granted to You under this License for that Work shall terminate
+      as of the date such litigation is filed.
+
+   4. Redistribution. You may reproduce and distribute copies of the
+      Work or Derivative Works thereof in any medium, with or without
+      modifications, and in Source or Object form, provided that You
+      meet the following conditions:
+
+      (a) You must give any other recipients of the Work or
+          Derivative Works a copy of this License; and
+
+      (b) You must cause any modified files to carry prominent notices
+          stating that You changed the files; and
+
+      (c) You must retain, in the Source form of any Derivative Works
+          that You distribute, all copyright, patent, trademark, and
+          attribution notices from the Source form of the Work,
+          excluding those notices that do not pertain to any part of
+          the Derivative Works; and
+
+      (d) If the Work includes a "NOTICE" text file as part of its
+          distribution, then any Derivative Works that You distribute must
+          include a readable copy of the attribution notices contained
+          within such NOTICE file, excluding those notices that do not
+          pertain to any part of the Derivative Works, in at least one
+          of the following places: within a NOTICE text file distributed
+          as part of the Derivative Works; within the Source form or
+          documentation, if provided along with the Derivative Works; or,
+          within a display generated by the Derivative Works, if and
+          wherever such third-party notices normally appear. The contents
+          of the NOTICE file are for informational purposes only and
+          do not modify the License. You may add Your own attribution
+          notices within Derivative Works that You distribute, alongside
+          or as an addendum to the NOTICE text from the Work, provided
+          that such additional attribution notices cannot be construed
+          as modifying the License.
+
+      You may add Your own copyright statement to Your modifications and
+      may provide additional or different license terms and conditions
+      for use, reproduction, or distribution of Your modifications, or
+      for any such Derivative Works as a whole, provided Your use,
+      reproduction, and distribution of the Work otherwise complies with
+      the conditions stated in this License.
+
+   5. Submission of Contributions. Unless You explicitly state otherwise,
+      any Contribution intentionally submitted for inclusion in the Work
+      by You to the Licensor shall be under the terms and conditions of
+      this License, without any additional terms or conditions.
+      Notwithstanding the above, nothing herein shall supersede or modify
+      the terms of any separate license agreement you may have executed
+      with Licensor regarding such Contributions.
+
+   6. Trademarks. This License does not grant permission to use the trade
+      names, trademarks, service marks, or product names of the Licensor,
+      except as required for reasonable and customary use in describing the
+      origin of the Work and reproducing the content of the NOTICE file.
+
+   7. Disclaimer of Warranty. Unless required by applicable law or
+      agreed to in writing, Licensor provides the Work (and each
+      Contributor provides its Contributions) on an "AS IS" BASIS,
+      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+      implied, including, without limitation, any warranties or conditions
+      of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
+      PARTICULAR PURPOSE. You are solely responsible for determining the
+      appropriateness of using or redistributing the Work and assume any
+      risks associated with Your exercise of permissions under this License.
+
+   8. Limitation of Liability. In no event and under no legal theory,
+      whether in tort (including negligence), contract, or otherwise,
+      unless required by applicable law (such as deliberate and grossly
+      negligent acts) or agreed to in writing, shall any Contributor be
+      liable to You for damages, including any direct, indirect, special,
+      incidental, or consequential damages of any character arising as a
+      result of this License or out of the use or inability to use the
+      Work (including but not limited to damages for loss of goodwill,
+      work stoppage, computer failure or malfunction, or any and all
+      other commercial damages or losses), even if such Contributor
+      has been advised of the possibility of such damages.
+
+   9. Accepting Warranty or Additional Liability. While redistributing
+      the Work or Derivative Works thereof, You may choose to offer,
+      and charge a fee for, acceptance of support, warranty, indemnity,
+      or other liability obligations and/or rights consistent with this
+      License. However, in accepting such obligations, You may act only
+      on Your own behalf and on Your sole responsibility, not on behalf
+      of any other Contributor, and only if You agree to indemnify,
+      defend, and hold each Contributor harmless for any liability
+      incurred by, or claims asserted against, such Contributor by reason
+      of your accepting any such warranty or additional liability.
+
+   END OF TERMS AND CONDITIONS
+
+   APPENDIX: How to apply the Apache License to your work.
+
+      To apply the Apache License to your work, attach the following
+      boilerplate notice, with the fields enclosed by brackets "[]"
+      replaced with your own identifying information. (Don't include
+      the brackets!)  The text should be enclosed in the appropriate
+      comment syntax for the file format. We also recommend that a
+      file or class name and description of purpose be included on the
+      same "printed page" as the copyright notice for easier
+      identification within third-party archives.
+
+   Copyright [yyyy] [name of copyright owner]
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+`,
+	}
+
+	Licenses["mit"] = License{
+		Name:            "Mit",
+		PossibleMatches: []string{"mit"},
+		Header: `
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.`,
+		Text: `The MIT License (MIT)
+
+{{ .copyright }}
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+`,
+	}
+
+	Licenses["bsd"] = License{
+		Name:            "NewBSD",
+		PossibleMatches: []string{"bsd", "newbsd", "3 clause bsd"},
+		Header: `
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+1. Redistributions of source code must retain the above copyright notice,
+   this list of conditions and the following disclaimer.
+
+2. Redistributions in binary form must reproduce the above copyright notice,
+   this list of conditions and the following disclaimer in the documentation
+   and/or other materials provided with the distribution.
+
+3. Neither the name of the copyright holder nor the names of its contributors
+   may be used to endorse or promote products derived from this software
+   without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.`,
+		Text: `{{ .copyright }}
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+1. Redistributions of source code must retain the above copyright notice,
+   this list of conditions and the following disclaimer.
+
+2. Redistributions in binary form must reproduce the above copyright notice,
+   this list of conditions and the following disclaimer in the documentation
+   and/or other materials provided with the distribution.
+
+3. Neither the name of the copyright holder nor the names of its contributors
+   may be used to endorse or promote products derived from this software
+   without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+`,
+	}
+
+	Licenses["freebsd"] = License{
+		Name:            "Simplified BSD License",
+		PossibleMatches: []string{"freebsd", "simpbsd", "simple bsd", "2 clause bsd"},
+		Header: `
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+1. Redistributions of source code must retain the above copyright notice,
+   this list of conditions and the following disclaimer.
+
+2. Redistributions in binary form must reproduce the above copyright notice,
+   this list of conditions and the following disclaimer in the documentation
+   and/or other materials provided with the distribution.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.`,
+		Text: `{{ .copyright }}
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+1. Redistributions of source code must retain the above copyright notice,
+   this list of conditions and the following disclaimer.
+
+2. Redistributions in binary form must reproduce the above copyright notice,
+   this list of conditions and the following disclaimer in the documentation
+   and/or other materials provided with the distribution.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+`,
+	}
+
+	Licenses["gpl3"] = License{
+		Name:            "GNU General Public License 3.0",
+		PossibleMatches: []string{"gpl3", "gpl", "gnu gpl3", "gnu gpl"},
+		Header: `{{ .copyright }}
+
+ This file is part of {{ .appName }}.
+
+ {{ .appName }} is free software: you can redistribute it and/or modify
+ it under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ {{ .appName }} is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ GNU Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with {{ .appName }}. If not, see <http://www.gnu.org/licenses/>.
+	   `,
+		Text: `                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU General Public License is a free, copyleft license for
+software and other kinds of works.
+
+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
+the GNU General Public License is intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users.  We, the Free Software Foundation, use the
+GNU General Public License for most of our software; it applies also to
+any other work released this way by its authors.  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+them if you wish), that you receive source code or can get it if you
+want it, that you can change the software or use pieces of it in new
+free programs, and that you know you can do these things.
+
+  To protect your rights, we need to prevent others from denying you
+these rights or asking you to surrender the rights.  Therefore, you have
+certain responsibilities if you distribute copies of the software, or if
+you modify it: responsibilities to respect the freedom of others.
+
+  For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must pass on to the recipients the same
+freedoms that you received.  You must make sure that they, too, receive
+or can get the source code.  And you must show them these terms so they
+know their rights.
+
+  Developers that use the GNU GPL protect your rights with two steps:
+(1) assert copyright on the software, and (2) offer you this License
+giving you legal permission to copy, distribute and/or modify it.
+
+  For the developers' and authors' protection, the GPL clearly explains
+that there is no warranty for this free software.  For both users' and
+authors' sake, the GPL requires that modified versions be marked as
+changed, so that their problems will not be attributed erroneously to
+authors of previous versions.
+
+  Some devices are designed to deny users access to install or run
+modified versions of the software inside them, although the manufacturer
+can do so.  This is fundamentally incompatible with the aim of
+protecting users' freedom to change the software.  The systematic
+pattern of such abuse occurs in the area of products for individuals to
+use, which is precisely where it is most unacceptable.  Therefore, we
+have designed this version of the GPL to prohibit the practice for those
+products.  If such problems arise substantially in other domains, we
+stand ready to extend this provision to those domains in future versions
+of the GPL, as needed to protect the freedom of users.
+
+  Finally, every program is threatened constantly by software patents.
+States should not allow patents to restrict development and use of
+software on general-purpose computers, but in those that do, we wish to
+avoid the special danger that patents applied to a free program could
+make it effectively proprietary.  To prevent this, the GPL assures that
+patents cannot be used to render the program non-free.
+
+  The precise terms and conditions for copying, distribution and
+modification follow.
+
+                       TERMS AND CONDITIONS
+
+  0. Definitions.
+
+  "This License" refers to version 3 of the GNU General Public License.
+
+  "Copyright" also means copyright-like laws that apply to other kinds of
+works, such as semiconductor masks.
+
+  "The Program" refers to any copyrightable work licensed under this
+License.  Each licensee is addressed as "you".  "Licensees" and
+"recipients" may be individuals or organizations.
+
+  To "modify" a work means to copy from or adapt all or part of the work
+in a fashion requiring copyright permission, other than the making of an
+exact copy.  The resulting work is called a "modified version" of the
+earlier work or a work "based on" the earlier work.
+
+  A "covered work" means either the unmodified Program or a work based
+on the Program.
+
+  To "propagate" a work means to do anything with it that, without
+permission, would make you directly or secondarily liable for
+infringement under applicable copyright law, except executing it on a
+computer or modifying a private copy.  Propagation includes copying,
+distribution (with or without modification), making available to the
+public, and in some countries other activities as well.
+
+  To "convey" a work means any kind of propagation that enables other
+parties to make or receive copies.  Mere interaction with a user through
+a computer network, with no transfer of a copy, is not conveying.
+
+  An interactive user interface displays "Appropriate Legal Notices"
+to the extent that it includes a convenient and prominently visible
+feature that (1) displays an appropriate copyright notice, and (2)
+tells the user that there is no warranty for the work (except to the
+extent that warranties are provided), that licensees may convey the
+work under this License, and how to view a copy of this License.  If
+the interface presents a list of user commands or options, such as a
+menu, a prominent item in the list meets this criterion.
+
+  1. Source Code.
+
+  The "source code" for a work means the preferred form of the work
+for making modifications to it.  "Object code" means any non-source
+form of a work.
+
+  A "Standard Interface" means an interface that either is an official
+standard defined by a recognized standards body, or, in the case of
+interfaces specified for a particular programming language, one that
+is widely used among developers working in that language.
+
+  The "System Libraries" of an executable work include anything, other
+than the work as a whole, that (a) is included in the normal form of
+packaging a Major Component, but which is not part of that Major
+Component, and (b) serves only to enable use of the work with that
+Major Component, or to implement a Standard Interface for which an
+implementation is available to the public in source code form.  A
+"Major Component", in this context, means a major essential component
+(kernel, window system, and so on) of the specific operating system
+(if any) on which the executable work runs, or a compiler used to
+produce the work, or an object code interpreter used to run it.
+
+  The "Corresponding Source" for a work in object code form means all
+the source code needed to generate, install, and (for an executable
+work) run the object code and to modify the work, including scripts to
+control those activities.  However, it does not include the work's
+System Libraries, or general-purpose tools or generally available free
+programs which are used unmodified in performing those activities but
+which are not part of the work.  For example, Corresponding Source
+includes interface definition files associated with source files for
+the work, and the source code for shared libraries and dynamically
+linked subprograms that the work is specifically designed to require,
+such as by intimate data communication or control flow between those
+subprograms and other parts of the work.
+
+  The Corresponding Source need not include anything that users
+can regenerate automatically from other parts of the Corresponding
+Source.
+
+  The Corresponding Source for a work in source code form is that
+same work.
+
+  2. Basic Permissions.
+
+  All rights granted under this License are granted for the term of
+copyright on the Program, and are irrevocable provided the stated
+conditions are met.  This License explicitly affirms your unlimited
+permission to run the unmodified Program.  The output from running a
+covered work is covered by this License only if the output, given its
+content, constitutes a covered work.  This License acknowledges your
+rights of fair use or other equivalent, as provided by copyright law.
+
+  You may make, run and propagate covered works that you do not
+convey, without conditions so long as your license otherwise remains
+in force.  You may convey covered works to others for the sole purpose
+of having them make modifications exclusively for you, or provide you
+with facilities for running those works, provided that you comply with
+the terms of this License in conveying all material for which you do
+not control copyright.  Those thus making or running the covered works
+for you must do so exclusively on your behalf, under your direction
+and control, on terms that prohibit them from making any copies of
+your copyrighted material outside their relationship with you.
+
+  Conveying under any other circumstances is permitted solely under
+the conditions stated below.  Sublicensing is not allowed; section 10
+makes it unnecessary.
+
+  3. Protecting Users' Legal Rights From Anti-Circumvention Law.
+
+  No covered work shall be deemed part of an effective technological
+measure under any applicable law fulfilling obligations under article
+11 of the WIPO copyright treaty adopted on 20 December 1996, or
+similar laws prohibiting or restricting circumvention of such
+measures.
+
+  When you convey a covered work, you waive any legal power to forbid
+circumvention of technological measures to the extent such circumvention
+is effected by exercising rights under this License with respect to
+the covered work, and you disclaim any intention to limit operation or
+modification of the work as a means of enforcing, against the work's
+users, your or third parties' legal rights to forbid circumvention of
+technological measures.
+
+  4. Conveying Verbatim Copies.
+
+  You may convey verbatim copies of the Program's source code as you
+receive it, in any medium, provided that you conspicuously and
+appropriately publish on each copy an appropriate copyright notice;
+keep intact all notices stating that this License and any
+non-permissive terms added in accord with section 7 apply to the code;
+keep intact all notices of the absence of any warranty; and give all
+recipients a copy of this License along with the Program.
+
+  You may charge any price or no price for each copy that you convey,
+and you may offer support or warranty protection for a fee.
+
+  5. Conveying Modified Source Versions.
+
+  You may convey a work based on the Program, or the modifications to
+produce it from the Program, in the form of source code under the
+terms of section 4, provided that you also meet all of these conditions:
+
+    a) The work must carry prominent notices stating that you modified
+    it, and giving a relevant date.
+
+    b) The work must carry prominent notices stating that it is
+    released under this License and any conditions added under section
+    7.  This requirement modifies the requirement in section 4 to
+    "keep intact all notices".
+
+    c) You must license the entire work, as a whole, under this
+    License to anyone who comes into possession of a copy.  This
+    License will therefore apply, along with any applicable section 7
+    additional terms, to the whole of the work, and all its parts,
+    regardless of how they are packaged.  This License gives no
+    permission to license the work in any other way, but it does not
+    invalidate such permission if you have separately received it.
+
+    d) If the work has interactive user interfaces, each must display
+    Appropriate Legal Notices; however, if the Program has interactive
+    interfaces that do not display Appropriate Legal Notices, your
+    work need not make them do so.
+
+  A compilation of a covered work with other separate and independent
+works, which are not by their nature extensions of the covered work,
+and which are not combined with it such as to form a larger program,
+in or on a volume of a storage or distribution medium, is called an
+"aggregate" if the compilation and its resulting copyright are not
+used to limit the access or legal rights of the compilation's users
+beyond what the individual works permit.  Inclusion of a covered work
+in an aggregate does not cause this License to apply to the other
+parts of the aggregate.
+
+  6. Conveying Non-Source Forms.
+
+  You may convey a covered work in object code form under the terms
+of sections 4 and 5, provided that you also convey the
+machine-readable Corresponding Source under the terms of this License,
+in one of these ways:
+
+    a) Convey the object code in, or embodied in, a physical product
+    (including a physical distribution medium), accompanied by the
+    Corresponding Source fixed on a durable physical medium
+    customarily used for software interchange.
+
+    b) Convey the object code in, or embodied in, a physical product
+    (including a physical distribution medium), accompanied by a
+    written offer, valid for at least three years and valid for as
+    long as you offer spare parts or customer support for that product
+    model, to give anyone who possesses the object code either (1) a
+    copy of the Corresponding Source for all the software in the
+    product that is covered by this License, on a durable physical
+    medium customarily used for software interchange, for a price no
+    more than your reasonable cost of physically performing this
+    conveying of source, or (2) access to copy the
+    Corresponding Source from a network server at no charge.
+
+    c) Convey individual copies of the object code with a copy of the
+    written offer to provide the Corresponding Source.  This
+    alternative is allowed only occasionally and noncommercially, and
+    only if you received the object code with such an offer, in accord
+    with subsection 6b.
+
+    d) Convey the object code by offering access from a designated
+    place (gratis or for a charge), and offer equivalent access to the
+    Corresponding Source in the same way through the same place at no
+    further charge.  You need not require recipients to copy the
+    Corresponding Source along with the object code.  If the place to
+    copy the object code is a network server, the Corresponding Source
+    may be on a different server (operated by you or a third party)
+    that supports equivalent copying facilities, provided you maintain
+    clear directions next to the object code saying where to find the
+    Corresponding Source.  Regardless of what server hosts the
+    Corresponding Source, you remain obligated to ensure that it is
+    available for as long as needed to satisfy these requirements.
+
+    e) Convey the object code using peer-to-peer transmission, provided
+    you inform other peers where the object code and Corresponding
+    Source of the work are being offered to the general public at no
+    charge under subsection 6d.
+
+  A separable portion of the object code, whose source code is excluded
+from the Corresponding Source as a System Library, need not be
+included in conveying the object code work.
+
+  A "User Product" is either (1) a "consumer product", which means any
+tangible personal property which is normally used for personal, family,
+or household purposes, or (2) anything designed or sold for incorporation
+into a dwelling.  In determining whether a product is a consumer product,
+doubtful cases shall be resolved in favor of coverage.  For a particular
+product received by a particular user, "normally used" refers to a
+typical or common use of that class of product, regardless of the status
+of the particular user or of the way in which the particular user
+actually uses, or expects or is expected to use, the product.  A product
+is a consumer product regardless of whether the product has substantial
+commercial, industrial or non-consumer uses, unless such uses represent
+the only significant mode of use of the product.
+
+  "Installation Information" for a User Product means any methods,
+procedures, authorization keys, or other information required to install
+and execute modified versions of a covered work in that User Product from
+a modified version of its Corresponding Source.  The information must
+suffice to ensure that the continued functioning of the modified object
+code is in no case prevented or interfered with solely because
+modification has been made.
+
+  If you convey an object code work under this section in, or with, or
+specifically for use in, a User Product, and the conveying occurs as
+part of a transaction in which the right of possession and use of the
+User Product is transferred to the recipient in perpetuity or for a
+fixed term (regardless of how the transaction is characterized), the
+Corresponding Source conveyed under this section must be accompanied
+by the Installation Information.  But this requirement does not apply
+if neither you nor any third party retains the ability to install
+modified object code on the User Product (for example, the work has
+been installed in ROM).
+
+  The requirement to provide Installation Information does not include a
+requirement to continue to provide support service, warranty, or updates
+for a work that has been modified or installed by the recipient, or for
+the User Product in which it has been modified or installed.  Access to a
+network may be denied when the modification itself materially and
+adversely affects the operation of the network or violates the rules and
+protocols for communication across the network.
+
+  Corresponding Source conveyed, and Installation Information provided,
+in accord with this section must be in a format that is publicly
+documented (and with an implementation available to the public in
+source code form), and must require no special password or key for
+unpacking, reading or copying.
+
+  7. Additional Terms.
+
+  "Additional permissions" are terms that supplement the terms of this
+License by making exceptions from one or more of its conditions.
+Additional permissions that are applicable to the entire Program shall
+be treated as though they were included in this License, to the extent
+that they are valid under applicable law.  If additional permissions
+apply only to part of the Program, that part may be used separately
+under those permissions, but the entire Program remains governed by
+this License without regard to the additional permissions.
+
+  When you convey a copy of a covered work, you may at your option
+remove any additional permissions from that copy, or from any part of
+it.  (Additional permissions may be written to require their own
+removal in certain cases when you modify the work.)  You may place
+additional permissions on material, added by you to a covered work,
+for which you have or can give appropriate copyright permission.
+
+  Notwithstanding any other provision of this License, for material you
+add to a covered work, you may (if authorized by the copyright holders of
+that material) supplement the terms of this License with terms:
+
+    a) Disclaiming warranty or limiting liability differently from the
+    terms of sections 15 and 16 of this License; or
+
+    b) Requiring preservation of specified reasonable legal notices or
+    author attributions in that material or in the Appropriate Legal
+    Notices displayed by works containing it; or
+
+    c) Prohibiting misrepresentation of the origin of that material, or
+    requiring that modified versions of such material be marked in
+    reasonable ways as different from the original version; or
+
+    d) Limiting the use for publicity purposes of names of licensors or
+    authors of the material; or
+
+    e) Declining to grant rights under trademark law for use of some
+    trade names, trademarks, or service marks; or
+
+    f) Requiring indemnification of licensors and authors of that
+    material by anyone who conveys the material (or modified versions of
+    it) with contractual assumptions of liability to the recipient, for
+    any liability that these contractual assumptions directly impose on
+    those licensors and authors.
+
+  All other non-permissive additional terms are considered "further
+restrictions" within the meaning of section 10.  If the Program as you
+received it, or any part of it, contains a notice stating that it is
+governed by this License along with a term that is a further
+restriction, you may remove that term.  If a license document contains
+a further restriction but permits relicensing or conveying under this
+License, you may add to a covered work material governed by the terms
+of that license document, provided that the further restriction does
+not survive such relicensing or conveying.
+
+  If you add terms to a covered work in accord with this section, you
+must place, in the relevant source files, a statement of the
+additional terms that apply to those files, or a notice indicating
+where to find the applicable terms.
+
+  Additional terms, permissive or non-permissive, may be stated in the
+form of a separately written license, or stated as exceptions;
+the above requirements apply either way.
+
+  8. Termination.
+
+  You may not propagate or modify a covered work except as expressly
+provided under this License.  Any attempt otherwise to propagate or
+modify it is void, and will automatically terminate your rights under
+this License (including any patent licenses granted under the third
+paragraph of section 11).
+
+  However, if you cease all violation of this License, then your
+license from a particular copyright holder is reinstated (a)
+provisionally, unless and until the copyright holder explicitly and
+finally terminates your license, and (b) permanently, if the copyright
+holder fails to notify you of the violation by some reasonable means
+prior to 60 days after the cessation.
+
+  Moreover, your license from a particular copyright holder is
+reinstated permanently if the copyright holder notifies you of the
+violation by some reasonable means, this is the first time you have
+received notice of violation of this License (for any work) from that
+copyright holder, and you cure the violation prior to 30 days after
+your receipt of the notice.
+
+  Termination of your rights under this section does not terminate the
+licenses of parties who have received copies or rights from you under
+this License.  If your rights have been terminated and not permanently
+reinstated, you do not qualify to receive new licenses for the same
+material under section 10.
+
+  9. Acceptance Not Required for Having Copies.
+
+  You are not required to accept this License in order to receive or
+run a copy of the Program.  Ancillary propagation of a covered work
+occurring solely as a consequence of using peer-to-peer transmission
+to receive a copy likewise does not require acceptance.  However,
+nothing other than this License grants you permission to propagate or
+modify any covered work.  These actions infringe copyright if you do
+not accept this License.  Therefore, by modifying or propagating a
+covered work, you indicate your acceptance of this License to do so.
+
+  10. Automatic Licensing of Downstream Recipients.
+
+  Each time you convey a covered work, the recipient automatically
+receives a license from the original licensors, to run, modify and
+propagate that work, subject to this License.  You are not responsible
+for enforcing compliance by third parties with this License.
+
+  An "entity transaction" is a transaction transferring control of an
+organization, or substantially all assets of one, or subdividing an
+organization, or merging organizations.  If propagation of a covered
+work results from an entity transaction, each party to that
+transaction who receives a copy of the work also receives whatever
+licenses to the work the party's predecessor in interest had or could
+give under the previous paragraph, plus a right to possession of the
+Corresponding Source of the work from the predecessor in interest, if
+the predecessor has it or can get it with reasonable efforts.
+
+  You may not impose any further restrictions on the exercise of the
+rights granted or affirmed under this License.  For example, you may
+not impose a license fee, royalty, or other charge for exercise of
+rights granted under this License, and you may not initiate litigation
+(including a cross-claim or counterclaim in a lawsuit) alleging that
+any patent claim is infringed by making, using, selling, offering for
+sale, or importing the Program or any portion of it.
+
+  11. Patents.
+
+  A "contributor" is a copyright holder who authorizes use under this
+License of the Program or a work on which the Program is based.  The
+work thus licensed is called the contributor's "contributor version".
+
+  A contributor's "essential patent claims" are all patent claims
+owned or controlled by the contributor, whether already acquired or
+hereafter acquired, that would be infringed by some manner, permitted
+by this License, of making, using, or selling its contributor version,
+but do not include claims that would be infringed only as a
+consequence of further modification of the contributor version.  For
+purposes of this definition, "control" includes the right to grant
+patent sublicenses in a manner consistent with the requirements of
+this License.
+
+  Each contributor grants you a non-exclusive, worldwide, royalty-free
+patent license under the contributor's essential patent claims, to
+make, use, sell, offer for sale, import and otherwise run, modify and
+propagate the contents of its contributor version.
+
+  In the following three paragraphs, a "patent license" is any express
+agreement or commitment, however denominated, not to enforce a patent
+(such as an express permission to practice a patent or covenant not to
+sue for patent infringement).  To "grant" such a patent license to a
+party means to make such an agreement or commitment not to enforce a
+patent against the party.
+
+  If you convey a covered work, knowingly relying on a patent license,
+and the Corresponding Source of the work is not available for anyone
+to copy, free of charge and under the terms of this License, through a
+publicly available network server or other readily accessible means,
+then you must either (1) cause the Corresponding Source to be so
+available, or (2) arrange to deprive yourself of the benefit of the
+patent license for this particular work, or (3) arrange, in a manner
+consistent with the requirements of this License, to extend the patent
+license to downstream recipients.  "Knowingly relying" means you have
+actual knowledge that, but for the patent license, your conveying the
+covered work in a country, or your recipient's use of the covered work
+in a country, would infringe one or more identifiable patents in that
+country that you have reason to believe are valid.
+
+  If, pursuant to or in connection with a single transaction or
+arrangement, you convey, or propagate by procuring conveyance of, a
+covered work, and grant a patent license to some of the parties
+receiving the covered work authorizing them to use, propagate, modify
+or convey a specific copy of the covered work, then the patent license
+you grant is automatically extended to all recipients of the covered
+work and works based on it.
+
+  A patent license is "discriminatory" if it does not include within
+the scope of its coverage, prohibits the exercise of, or is
+conditioned on the non-exercise of one or more of the rights that are
+specifically granted under this License.  You may not convey a covered
+work if you are a party to an arrangement with a third party that is
+in the business of distributing software, under which you make payment
+to the third party based on the extent of your activity of conveying
+the work, and under which the third party grants, to any of the
+parties who would receive the covered work from you, a discriminatory
+patent license (a) in connection with copies of the covered work
+conveyed by you (or copies made from those copies), or (b) primarily
+for and in connection with specific products or compilations that
+contain the covered work, unless you entered into that arrangement,
+or that patent license was granted, prior to 28 March 2007.
+
+  Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License.  If you cannot convey a
+covered work so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you may
+not convey it at all.  For example, if you agree to terms that obligate you
+to collect a royalty for further conveying from those to whom you convey
+the Program, the only way you could satisfy both those terms and this
+License would be to refrain entirely from conveying the Program.
+
+  13. Use with the GNU Affero General Public License.
+
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU Affero General Public License into a single
+combined work, and to convey the resulting work.  The terms of this
+License will continue to apply to the part which is the covered work,
+but the special requirements of the GNU Affero General Public License,
+section 13, concerning interaction through a network will apply to the
+combination as such.
+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type 'show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type 'show c' for details.
+
+The hypothetical commands 'show w' and 'show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<http://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<http://www.gnu.org/philosophy/why-not-lgpl.html>.
+`,
+	}
+
+	// Licenses["apache20"] = License{
+	// 	Name:            "Apache 2.0",
+	// 	PossibleMatches: []string{"apache", "apache20", ""},
+	//   Header: `
+	//   `,
+	// 	Text: `
+	//   `,
+	// }
+}

vendor/golang.org/x/crypto/ssh/buffer.go

@@ -1,97 +0,0 @@
-// Copyright 2012 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package ssh
-
-import (
-	"io"
-	"sync"
-)
-
-// buffer provides a linked list buffer for data exchange
-// between producer and consumer. Theoretically the buffer is
-// of unlimited capacity as it does no allocation of its own.
-type buffer struct {
-	// protects concurrent access to head, tail and closed
-	*sync.Cond
-
-	head *element // the buffer that will be read first
-	tail *element // the buffer that will be read last
-
-	closed bool
-}
-
-// An element represents a single link in a linked list.
-type element struct {
-	buf  []byte
-	next *element
-}
-
-// newBuffer returns an empty buffer that is not closed.
-func newBuffer() *buffer {
-	e := new(element)
-	b := &buffer{
-		Cond: newCond(),
-		head: e,
-		tail: e,
-	}
-	return b
-}
-
-// write makes buf available for Read to receive.
-// buf must not be modified after the call to write.
-func (b *buffer) write(buf []byte) {
-	b.Cond.L.Lock()
-	e := &element{buf: buf}
-	b.tail.next = e
-	b.tail = e
-	b.Cond.Signal()
-	b.Cond.L.Unlock()
-}
-
-// eof closes the buffer. Reads from the buffer once all
-// the data has been consumed will receive io.EOF.
-func (b *buffer) eof() {
-	b.Cond.L.Lock()
-	b.closed = true
-	b.Cond.Signal()
-	b.Cond.L.Unlock()
-}
-
-// Read reads data from the internal buffer in buf.  Reads will block
-// if no data is available, or until the buffer is closed.
-func (b *buffer) Read(buf []byte) (n int, err error) {
-	b.Cond.L.Lock()
-	defer b.Cond.L.Unlock()
-
-	for len(buf) > 0 {
-		// if there is data in b.head, copy it
-		if len(b.head.buf) > 0 {
-			r := copy(buf, b.head.buf)
-			buf, b.head.buf = buf[r:], b.head.buf[r:]
-			n += r
-			continue
-		}
-		// if there is a next buffer, make it the head
-		if len(b.head.buf) == 0 && b.head != b.tail {
-			b.head = b.head.next
-			continue
-		}
-
-		// if at least one byte has been copied, return
-		if n > 0 {
-			break
-		}
-
-		// if nothing was read, and there is nothing outstanding
-		// check to see if the buffer is closed.
-		if b.closed {
-			err = io.EOF
-			break
-		}
-		// out of buffers, wait for producer
-		b.Cond.Wait()
-	}
-	return
-}

vendor/golang.org/x/crypto/ssh/certs.go

@@ -1,519 +0,0 @@
-// Copyright 2012 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package ssh
-
-import (
-	"bytes"
-	"errors"
-	"fmt"
-	"io"
-	"net"
-	"sort"
-	"time"
-)
-
-// These constants from [PROTOCOL.certkeys] represent the algorithm names
-// for certificate types supported by this package.
-const (
-	CertAlgoRSAv01      = "ssh-rsa-cert-v01@openssh.com"
-	CertAlgoDSAv01      = "ssh-dss-cert-v01@openssh.com"
-	CertAlgoECDSA256v01 = "ecdsa-sha2-nistp256-cert-v01@openssh.com"
-	CertAlgoECDSA384v01 = "ecdsa-sha2-nistp384-cert-v01@openssh.com"
-	CertAlgoECDSA521v01 = "ecdsa-sha2-nistp521-cert-v01@openssh.com"
-	CertAlgoED25519v01  = "ssh-ed25519-cert-v01@openssh.com"
-)
-
-// Certificate types distinguish between host and user
-// certificates. The values can be set in the CertType field of
-// Certificate.
-const (
-	UserCert = 1
-	HostCert = 2
-)
-
-// Signature represents a cryptographic signature.
-type Signature struct {
-	Format string
-	Blob   []byte
-}
-
-// CertTimeInfinity can be used for OpenSSHCertV01.ValidBefore to indicate that
-// a certificate does not expire.
-const CertTimeInfinity = 1<<64 - 1
-
-// An Certificate represents an OpenSSH certificate as defined in
-// [PROTOCOL.certkeys]?rev=1.8.
-type Certificate struct {
-	Nonce           []byte
-	Key             PublicKey
-	Serial          uint64
-	CertType        uint32
-	KeyId           string
-	ValidPrincipals []string
-	ValidAfter      uint64
-	ValidBefore     uint64
-	Permissions
-	Reserved     []byte
-	SignatureKey PublicKey
-	Signature    *Signature
-}
-
-// genericCertData holds the key-independent part of the certificate data.
-// Overall, certificates contain an nonce, public key fields and
-// key-independent fields.
-type genericCertData struct {
-	Serial          uint64
-	CertType        uint32
-	KeyId           string
-	ValidPrincipals []byte
-	ValidAfter      uint64
-	ValidBefore     uint64
-	CriticalOptions []byte
-	Extensions      []byte
-	Reserved        []byte
-	SignatureKey    []byte
-	Signature       []byte
-}
-
-func marshalStringList(namelist []string) []byte {
-	var to []byte
-	for _, name := range namelist {
-		s := struct{ N string }{name}
-		to = append(to, Marshal(&s)...)
-	}
-	return to
-}
-
-type optionsTuple struct {
-	Key   string
-	Value []byte
-}
-
-type optionsTupleValue struct {
-	Value string
-}
-
-// serialize a map of critical options or extensions
-// issue #10569 - per [PROTOCOL.certkeys] and SSH implementation,
-// we need two length prefixes for a non-empty string value
-func marshalTuples(tups map[string]string) []byte {
-	keys := make([]string, 0, len(tups))
-	for key := range tups {
-		keys = append(keys, key)
-	}
-	sort.Strings(keys)
-
-	var ret []byte
-	for _, key := range keys {
-		s := optionsTuple{Key: key}
-		if value := tups[key]; len(value) > 0 {
-			s.Value = Marshal(&optionsTupleValue{value})
-		}
-		ret = append(ret, Marshal(&s)...)
-	}
-	return ret
-}
-
-// issue #10569 - per [PROTOCOL.certkeys] and SSH implementation,
-// we need two length prefixes for a non-empty option value
-func parseTuples(in []byte) (map[string]string, error) {
-	tups := map[string]string{}
-	var lastKey string
-	var haveLastKey bool
-
-	for len(in) > 0 {
-		var key, val, extra []byte
-		var ok bool
-
-		if key, in, ok = parseString(in); !ok {
-			return nil, errShortRead
-		}
-		keyStr := string(key)
-		// according to [PROTOCOL.certkeys], the names must be in
-		// lexical order.
-		if haveLastKey && keyStr <= lastKey {
-			return nil, fmt.Errorf("ssh: certificate options are not in lexical order")
-		}
-		lastKey, haveLastKey = keyStr, true
-		// the next field is a data field, which if non-empty has a string embedded
-		if val, in, ok = parseString(in); !ok {
-			return nil, errShortRead
-		}
-		if len(val) > 0 {
-			val, extra, ok = parseString(val)
-			if !ok {
-				return nil, errShortRead
-			}
-			if len(extra) > 0 {
-				return nil, fmt.Errorf("ssh: unexpected trailing data after certificate option value")
-			}
-			tups[keyStr] = string(val)
-		} else {
-			tups[keyStr] = ""
-		}
-	}
-	return tups, nil
-}
-
-func parseCert(in []byte, privAlgo string) (*Certificate, error) {
-	nonce, rest, ok := parseString(in)
-	if !ok {
-		return nil, errShortRead
-	}
-
-	key, rest, err := parsePubKey(rest, privAlgo)
-	if err != nil {
-		return nil, err
-	}
-
-	var g genericCertData
-	if err := Unmarshal(rest, &g); err != nil {
-		return nil, err
-	}
-
-	c := &Certificate{
-		Nonce:       nonce,
-		Key:         key,
-		Serial:      g.Serial,
-		CertType:    g.CertType,
-		KeyId:       g.KeyId,
-		ValidAfter:  g.ValidAfter,
-		ValidBefore: g.ValidBefore,
-	}
-
-	for principals := g.ValidPrincipals; len(principals) > 0; {
-		principal, rest, ok := parseString(principals)
-		if !ok {
-			return nil, errShortRead
-		}
-		c.ValidPrincipals = append(c.ValidPrincipals, string(principal))
-		principals = rest
-	}
-
-	c.CriticalOptions, err = parseTuples(g.CriticalOptions)
-	if err != nil {
-		return nil, err
-	}
-	c.Extensions, err = parseTuples(g.Extensions)
-	if err != nil {
-		return nil, err
-	}
-	c.Reserved = g.Reserved
-	k, err := ParsePublicKey(g.SignatureKey)
-	if err != nil {
-		return nil, err
-	}
-
-	c.SignatureKey = k
-	c.Signature, rest, ok = parseSignatureBody(g.Signature)
-	if !ok || len(rest) > 0 {
-		return nil, errors.New("ssh: signature parse error")
-	}
-
-	return c, nil
-}
-
-type openSSHCertSigner struct {
-	pub    *Certificate
-	signer Signer
-}
-
-// NewCertSigner returns a Signer that signs with the given Certificate, whose
-// private key is held by signer. It returns an error if the public key in cert
-// doesn't match the key used by signer.
-func NewCertSigner(cert *Certificate, signer Signer) (Signer, error) {
-	if bytes.Compare(cert.Key.Marshal(), signer.PublicKey().Marshal()) != 0 {
-		return nil, errors.New("ssh: signer and cert have different public key")
-	}
-
-	return &openSSHCertSigner{cert, signer}, nil
-}
-
-func (s *openSSHCertSigner) Sign(rand io.Reader, data []byte) (*Signature, error) {
-	return s.signer.Sign(rand, data)
-}
-
-func (s *openSSHCertSigner) PublicKey() PublicKey {
-	return s.pub
-}
-
-const sourceAddressCriticalOption = "source-address"
-
-// CertChecker does the work of verifying a certificate. Its methods
-// can be plugged into ClientConfig.HostKeyCallback and
-// ServerConfig.PublicKeyCallback. For the CertChecker to work,
-// minimally, the IsAuthority callback should be set.
-type CertChecker struct {
-	// SupportedCriticalOptions lists the CriticalOptions that the
-	// server application layer understands. These are only used
-	// for user certificates.
-	SupportedCriticalOptions []string
-
-	// IsUserAuthority should return true if the key is recognized as an
-	// authority for the given user certificate. This allows for
-	// certificates to be signed by other certificates. This must be set
-	// if this CertChecker will be checking user certificates.
-	IsUserAuthority func(auth PublicKey) bool
-
-	// IsHostAuthority should report whether the key is recognized as
-	// an authority for this host. This allows for certificates to be
-	// signed by other keys, and for those other keys to only be valid
-	// signers for particular hostnames. This must be set if this
-	// CertChecker will be checking host certificates.
-	IsHostAuthority func(auth PublicKey, address string) bool
-
-	// Clock is used for verifying time stamps. If nil, time.Now
-	// is used.
-	Clock func() time.Time
-
-	// UserKeyFallback is called when CertChecker.Authenticate encounters a
-	// public key that is not a certificate. It must implement validation
-	// of user keys or else, if nil, all such keys are rejected.
-	UserKeyFallback func(conn ConnMetadata, key PublicKey) (*Permissions, error)
-
-	// HostKeyFallback is called when CertChecker.CheckHostKey encounters a
-	// public key that is not a certificate. It must implement host key
-	// validation or else, if nil, all such keys are rejected.
-	HostKeyFallback HostKeyCallback
-
-	// IsRevoked is called for each certificate so that revocation checking
-	// can be implemented. It should return true if the given certificate
-	// is revoked and false otherwise. If nil, no certificates are
-	// considered to have been revoked.
-	IsRevoked func(cert *Certificate) bool
-}
-
-// CheckHostKey checks a host key certificate. This method can be
-// plugged into ClientConfig.HostKeyCallback.
-func (c *CertChecker) CheckHostKey(addr string, remote net.Addr, key PublicKey) error {
-	cert, ok := key.(*Certificate)
-	if !ok {
-		if c.HostKeyFallback != nil {
-			return c.HostKeyFallback(addr, remote, key)
-		}
-		return errors.New("ssh: non-certificate host key")
-	}
-	if cert.CertType != HostCert {
-		return fmt.Errorf("ssh: certificate presented as a host key has type %d", cert.CertType)
-	}
-	if !c.IsHostAuthority(cert.SignatureKey, addr) {
-		return fmt.Errorf("ssh: no authorities for hostname: %v", addr)
-	}
-
-	hostname, _, err := net.SplitHostPort(addr)
-	if err != nil {
-		return err
-	}
-
-	// Pass hostname only as principal for host certificates (consistent with OpenSSH)
-	return c.CheckCert(hostname, cert)
-}
-
-// Authenticate checks a user certificate. Authenticate can be used as
-// a value for ServerConfig.PublicKeyCallback.
-func (c *CertChecker) Authenticate(conn ConnMetadata, pubKey PublicKey) (*Permissions, error) {
-	cert, ok := pubKey.(*Certificate)
-	if !ok {
-		if c.UserKeyFallback != nil {
-			return c.UserKeyFallback(conn, pubKey)
-		}
-		return nil, errors.New("ssh: normal key pairs not accepted")
-	}
-
-	if cert.CertType != UserCert {
-		return nil, fmt.Errorf("ssh: cert has type %d", cert.CertType)
-	}
-	if !c.IsUserAuthority(cert.SignatureKey) {
-		return nil, fmt.Errorf("ssh: certificate signed by unrecognized authority")
-	}
-
-	if err := c.CheckCert(conn.User(), cert); err != nil {
-		return nil, err
-	}
-
-	return &cert.Permissions, nil
-}
-
-// CheckCert checks CriticalOptions, ValidPrincipals, revocation, timestamp and
-// the signature of the certificate.
-func (c *CertChecker) CheckCert(principal string, cert *Certificate) error {
-	if c.IsRevoked != nil && c.IsRevoked(cert) {
-		return fmt.Errorf("ssh: certicate serial %d revoked", cert.Serial)
-	}
-
-	for opt, _ := range cert.CriticalOptions {
-		// sourceAddressCriticalOption will be enforced by
-		// serverAuthenticate
-		if opt == sourceAddressCriticalOption {
-			continue
-		}
-
-		found := false
-		for _, supp := range c.SupportedCriticalOptions {
-			if supp == opt {
-				found = true
-				break
-			}
-		}
-		if !found {
-			return fmt.Errorf("ssh: unsupported critical option %q in certificate", opt)
-		}
-	}
-
-	if len(cert.ValidPrincipals) > 0 {
-		// By default, certs are valid for all users/hosts.
-		found := false
-		for _, p := range cert.ValidPrincipals {
-			if p == principal {
-				found = true
-				break
-			}
-		}
-		if !found {
-			return fmt.Errorf("ssh: principal %q not in the set of valid principals for given certificate: %q", principal, cert.ValidPrincipals)
-		}
-	}
-
-	clock := c.Clock
-	if clock == nil {
-		clock = time.Now
-	}
-
-	unixNow := clock().Unix()
-	if after := int64(cert.ValidAfter); after < 0 || unixNow < int64(cert.ValidAfter) {
-		return fmt.Errorf("ssh: cert is not yet valid")
-	}
-	if before := int64(cert.ValidBefore); cert.ValidBefore != uint64(CertTimeInfinity) && (unixNow >= before || before < 0) {
-		return fmt.Errorf("ssh: cert has expired")
-	}
-	if err := cert.SignatureKey.Verify(cert.bytesForSigning(), cert.Signature); err != nil {
-		return fmt.Errorf("ssh: certificate signature does not verify")
-	}
-
-	return nil
-}
-
-// SignCert sets c.SignatureKey to the authority's public key and stores a
-// Signature, by authority, in the certificate.
-func (c *Certificate) SignCert(rand io.Reader, authority Signer) error {
-	c.Nonce = make([]byte, 32)
-	if _, err := io.ReadFull(rand, c.Nonce); err != nil {
-		return err
-	}
-	c.SignatureKey = authority.PublicKey()
-
-	sig, err := authority.Sign(rand, c.bytesForSigning())
-	if err != nil {
-		return err
-	}
-	c.Signature = sig
-	return nil
-}
-
-var certAlgoNames = map[string]string{
-	KeyAlgoRSA:      CertAlgoRSAv01,
-	KeyAlgoDSA:      CertAlgoDSAv01,
-	KeyAlgoECDSA256: CertAlgoECDSA256v01,
-	KeyAlgoECDSA384: CertAlgoECDSA384v01,
-	KeyAlgoECDSA521: CertAlgoECDSA521v01,
-	KeyAlgoED25519:  CertAlgoED25519v01,
-}
-
-// certToPrivAlgo returns the underlying algorithm for a certificate algorithm.
-// Panics if a non-certificate algorithm is passed.
-func certToPrivAlgo(algo string) string {
-	for privAlgo, pubAlgo := range certAlgoNames {
-		if pubAlgo == algo {
-			return privAlgo
-		}
-	}
-	panic("unknown cert algorithm")
-}
-
-func (cert *Certificate) bytesForSigning() []byte {
-	c2 := *cert
-	c2.Signature = nil
-	out := c2.Marshal()
-	// Drop trailing signature length.
-	return out[:len(out)-4]
-}
-
-// Marshal serializes c into OpenSSH's wire format. It is part of the
-// PublicKey interface.
-func (c *Certificate) Marshal() []byte {
-	generic := genericCertData{
-		Serial:          c.Serial,
-		CertType:        c.CertType,
-		KeyId:           c.KeyId,
-		ValidPrincipals: marshalStringList(c.ValidPrincipals),
-		ValidAfter:      uint64(c.ValidAfter),
-		ValidBefore:     uint64(c.ValidBefore),
-		CriticalOptions: marshalTuples(c.CriticalOptions),
-		Extensions:      marshalTuples(c.Extensions),
-		Reserved:        c.Reserved,
-		SignatureKey:    c.SignatureKey.Marshal(),
-	}
-	if c.Signature != nil {
-		generic.Signature = Marshal(c.Signature)
-	}
-	genericBytes := Marshal(&generic)
-	keyBytes := c.Key.Marshal()
-	_, keyBytes, _ = parseString(keyBytes)
-	prefix := Marshal(&struct {
-		Name  string
-		Nonce []byte
-		Key   []byte `ssh:"rest"`
-	}{c.Type(), c.Nonce, keyBytes})
-
-	result := make([]byte, 0, len(prefix)+len(genericBytes))
-	result = append(result, prefix...)
-	result = append(result, genericBytes...)
-	return result
-}
-
-// Type returns the key name. It is part of the PublicKey interface.
-func (c *Certificate) Type() string {
-	algo, ok := certAlgoNames[c.Key.Type()]
-	if !ok {
-		panic("unknown cert key type " + c.Key.Type())
-	}
-	return algo
-}
-
-// Verify verifies a signature against the certificate's public
-// key. It is part of the PublicKey interface.
-func (c *Certificate) Verify(data []byte, sig *Signature) error {
-	return c.Key.Verify(data, sig)
-}
-
-func parseSignatureBody(in []byte) (out *Signature, rest []byte, ok bool) {
-	format, in, ok := parseString(in)
-	if !ok {
-		return
-	}
-
-	out = &Signature{
-		Format: string(format),
-	}
-
-	if out.Blob, in, ok = parseString(in); !ok {
-		return
-	}
-
-	return out, in, ok
-}
-
-func parseSignature(in []byte) (out *Signature, rest []byte, ok bool) {
-	sigBytes, rest, ok := parseString(in)
-	if !ok {
-		return
-	}
-
-	out, trailing, ok := parseSignatureBody(sigBytes)
-	if !ok || len(trailing) > 0 {
-		return nil, nil, false
-	}
-	return
-}

vendor/golang.org/x/crypto/ssh/channel.go

@@ -1,633 +0,0 @@
-// Copyright 2011 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package ssh
-
-import (
-	"encoding/binary"
-	"errors"
-	"fmt"
-	"io"
-	"log"
-	"sync"
-)
-
-const (
-	minPacketLength = 9
-	// channelMaxPacket contains the maximum number of bytes that will be
-	// sent in a single packet. As per RFC 4253, section 6.1, 32k is also
-	// the minimum.
-	channelMaxPacket = 1 << 15
-	// We follow OpenSSH here.
-	channelWindowSize = 64 * channelMaxPacket
-)
-
-// NewChannel represents an incoming request to a channel. It must either be
-// accepted for use by calling Accept, or rejected by calling Reject.
-type NewChannel interface {
-	// Accept accepts the channel creation request. It returns the Channel
-	// and a Go channel containing SSH requests. The Go channel must be
-	// serviced otherwise the Channel will hang.
-	Accept() (Channel, <-chan *Request, error)
-
-	// Reject rejects the channel creation request. After calling
-	// this, no other methods on the Channel may be called.
-	Reject(reason RejectionReason, message string) error
-
-	// ChannelType returns the type of the channel, as supplied by the
-	// client.
-	ChannelType() string
-
-	// ExtraData returns the arbitrary payload for this channel, as supplied
-	// by the client. This data is specific to the channel type.
-	ExtraData() []byte
-}
-
-// A Channel is an ordered, reliable, flow-controlled, duplex stream
-// that is multiplexed over an SSH connection.
-type Channel interface {
-	// Read reads up to len(data) bytes from the channel.
-	Read(data []byte) (int, error)
-
-	// Write writes len(data) bytes to the channel.
-	Write(data []byte) (int, error)
-
-	// Close signals end of channel use. No data may be sent after this
-	// call.
-	Close() error
-
-	// CloseWrite signals the end of sending in-band
-	// data. Requests may still be sent, and the other side may
-	// still send data
-	CloseWrite() error
-
-	// SendRequest sends a channel request.  If wantReply is true,
-	// it will wait for a reply and return the result as a
-	// boolean, otherwise the return value will be false. Channel
-	// requests are out-of-band messages so they may be sent even
-	// if the data stream is closed or blocked by flow control.
-	// If the channel is closed before a reply is returned, io.EOF
-	// is returned.
-	SendRequest(name string, wantReply bool, payload []byte) (bool, error)
-
-	// Stderr returns an io.ReadWriter that writes to this channel
-	// with the extended data type set to stderr. Stderr may
-	// safely be read and written from a different goroutine than
-	// Read and Write respectively.
-	Stderr() io.ReadWriter
-}
-
-// Request is a request sent outside of the normal stream of
-// data. Requests can either be specific to an SSH channel, or they
-// can be global.
-type Request struct {
-	Type      string
-	WantReply bool
-	Payload   []byte
-
-	ch  *channel
-	mux *mux
-}
-
-// Reply sends a response to a request. It must be called for all requests
-// where WantReply is true and is a no-op otherwise. The payload argument is
-// ignored for replies to channel-specific requests.
-func (r *Request) Reply(ok bool, payload []byte) error {
-	if !r.WantReply {
-		return nil
-	}
-
-	if r.ch == nil {
-		return r.mux.ackRequest(ok, payload)
-	}
-
-	return r.ch.ackRequest(ok)
-}
-
-// RejectionReason is an enumeration used when rejecting channel creation
-// requests. See RFC 4254, section 5.1.
-type RejectionReason uint32
-
-const (
-	Prohibited RejectionReason = iota + 1
-	ConnectionFailed
-	UnknownChannelType
-	ResourceShortage
-)
-
-// String converts the rejection reason to human readable form.
-func (r RejectionReason) String() string {
-	switch r {
-	case Prohibited:
-		return "administratively prohibited"
-	case ConnectionFailed:
-		return "connect failed"
-	case UnknownChannelType:
-		return "unknown channel type"
-	case ResourceShortage:
-		return "resource shortage"
-	}
-	return fmt.Sprintf("unknown reason %d", int(r))
-}
-
-func min(a uint32, b int) uint32 {
-	if a < uint32(b) {
-		return a
-	}
-	return uint32(b)
-}
-
-type channelDirection uint8
-
-const (
-	channelInbound channelDirection = iota
-	channelOutbound
-)
-
-// channel is an implementation of the Channel interface that works
-// with the mux class.
-type channel struct {
-	// R/O after creation
-	chanType          string
-	extraData         []byte
-	localId, remoteId uint32
-
-	// maxIncomingPayload and maxRemotePayload are the maximum
-	// payload sizes of normal and extended data packets for
-	// receiving and sending, respectively. The wire packet will
-	// be 9 or 13 bytes larger (excluding encryption overhead).
-	maxIncomingPayload uint32
-	maxRemotePayload   uint32
-
-	mux *mux
-
-	// decided is set to true if an accept or reject message has been sent
-	// (for outbound channels) or received (for inbound channels).
-	decided bool
-
-	// direction contains either channelOutbound, for channels created
-	// locally, or channelInbound, for channels created by the peer.
-	direction channelDirection
-
-	// Pending internal channel messages.
-	msg chan interface{}
-
-	// Since requests have no ID, there can be only one request
-	// with WantReply=true outstanding.  This lock is held by a
-	// goroutine that has such an outgoing request pending.
-	sentRequestMu sync.Mutex
-
-	incomingRequests chan *Request
-
-	sentEOF bool
-
-	// thread-safe data
-	remoteWin  window
-	pending    *buffer
-	extPending *buffer
-
-	// windowMu protects myWindow, the flow-control window.
-	windowMu sync.Mutex
-	myWindow uint32
-
-	// writeMu serializes calls to mux.conn.writePacket() and
-	// protects sentClose and packetPool. This mutex must be
-	// different from windowMu, as writePacket can block if there
-	// is a key exchange pending.
-	writeMu   sync.Mutex
-	sentClose bool
-
-	// packetPool has a buffer for each extended channel ID to
-	// save allocations during writes.
-	packetPool map[uint32][]byte
-}
-
-// writePacket sends a packet. If the packet is a channel close, it updates
-// sentClose. This method takes the lock c.writeMu.
-func (c *channel) writePacket(packet []byte) error {
-	c.writeMu.Lock()
-	if c.sentClose {
-		c.writeMu.Unlock()
-		return io.EOF
-	}
-	c.sentClose = (packet[0] == msgChannelClose)
-	err := c.mux.conn.writePacket(packet)
-	c.writeMu.Unlock()
-	return err
-}
-
-func (c *channel) sendMessage(msg interface{}) error {
-	if debugMux {
-		log.Printf("send(%d): %#v", c.mux.chanList.offset, msg)
-	}
-
-	p := Marshal(msg)
-	binary.BigEndian.PutUint32(p[1:], c.remoteId)
-	return c.writePacket(p)
-}
-
-// WriteExtended writes data to a specific extended stream. These streams are
-// used, for example, for stderr.
-func (c *channel) WriteExtended(data []byte, extendedCode uint32) (n int, err error) {
-	if c.sentEOF {
-		return 0, io.EOF
-	}
-	// 1 byte message type, 4 bytes remoteId, 4 bytes data length
-	opCode := byte(msgChannelData)
-	headerLength := uint32(9)
-	if extendedCode > 0 {
-		headerLength += 4
-		opCode = msgChannelExtendedData
-	}
-
-	c.writeMu.Lock()
-	packet := c.packetPool[extendedCode]
-	// We don't remove the buffer from packetPool, so
-	// WriteExtended calls from different goroutines will be
-	// flagged as errors by the race detector.
-	c.writeMu.Unlock()
-
-	for len(data) > 0 {
-		space := min(c.maxRemotePayload, len(data))
-		if space, err = c.remoteWin.reserve(space); err != nil {
-			return n, err
-		}
-		if want := headerLength + space; uint32(cap(packet)) < want {
-			packet = make([]byte, want)
-		} else {
-			packet = packet[:want]
-		}
-
-		todo := data[:space]
-
-		packet[0] = opCode
-		binary.BigEndian.PutUint32(packet[1:], c.remoteId)
-		if extendedCode > 0 {
-			binary.BigEndian.PutUint32(packet[5:], uint32(extendedCode))
-		}
-		binary.BigEndian.PutUint32(packet[headerLength-4:], uint32(len(todo)))
-		copy(packet[headerLength:], todo)
-		if err = c.writePacket(packet); err != nil {
-			return n, err
-		}
-
-		n += len(todo)
-		data = data[len(todo):]
-	}
-
-	c.writeMu.Lock()
-	c.packetPool[extendedCode] = packet
-	c.writeMu.Unlock()
-
-	return n, err
-}
-
-func (c *channel) handleData(packet []byte) error {
-	headerLen := 9
-	isExtendedData := packet[0] == msgChannelExtendedData
-	if isExtendedData {
-		headerLen = 13
-	}
-	if len(packet) < headerLen {
-		// malformed data packet
-		return parseError(packet[0])
-	}
-
-	var extended uint32
-	if isExtendedData {
-		extended = binary.BigEndian.Uint32(packet[5:])
-	}
-
-	length := binary.BigEndian.Uint32(packet[headerLen-4 : headerLen])
-	if length == 0 {
-		return nil
-	}
-	if length > c.maxIncomingPayload {
-		// TODO(hanwen): should send Disconnect?
-		return errors.New("ssh: incoming packet exceeds maximum payload size")
-	}
-
-	data := packet[headerLen:]
-	if length != uint32(len(data)) {
-		return errors.New("ssh: wrong packet length")
-	}
-
-	c.windowMu.Lock()
-	if c.myWindow < length {
-		c.windowMu.Unlock()
-		// TODO(hanwen): should send Disconnect with reason?
-		return errors.New("ssh: remote side wrote too much")
-	}
-	c.myWindow -= length
-	c.windowMu.Unlock()
-
-	if extended == 1 {
-		c.extPending.write(data)
-	} else if extended > 0 {
-		// discard other extended data.
-	} else {
-		c.pending.write(data)
-	}
-	return nil
-}
-
-func (c *channel) adjustWindow(n uint32) error {
-	c.windowMu.Lock()
-	// Since myWindow is managed on our side, and can never exceed
-	// the initial window setting, we don't worry about overflow.
-	c.myWindow += uint32(n)
-	c.windowMu.Unlock()
-	return c.sendMessage(windowAdjustMsg{
-		AdditionalBytes: uint32(n),
-	})
-}
-
-func (c *channel) ReadExtended(data []byte, extended uint32) (n int, err error) {
-	switch extended {
-	case 1:
-		n, err = c.extPending.Read(data)
-	case 0:
-		n, err = c.pending.Read(data)
-	default:
-		return 0, fmt.Errorf("ssh: extended code %d unimplemented", extended)
-	}
-
-	if n > 0 {
-		err = c.adjustWindow(uint32(n))
-		// sendWindowAdjust can return io.EOF if the remote
-		// peer has closed the connection, however we want to
-		// defer forwarding io.EOF to the caller of Read until
-		// the buffer has been drained.
-		if n > 0 && err == io.EOF {
-			err = nil
-		}
-	}
-
-	return n, err
-}
-
-func (c *channel) close() {
-	c.pending.eof()
-	c.extPending.eof()
-	close(c.msg)
-	close(c.incomingRequests)
-	c.writeMu.Lock()
-	// This is not necessary for a normal channel teardown, but if
-	// there was another error, it is.
-	c.sentClose = true
-	c.writeMu.Unlock()
-	// Unblock writers.
-	c.remoteWin.close()
-}
-
-// responseMessageReceived is called when a success or failure message is
-// received on a channel to check that such a message is reasonable for the
-// given channel.
-func (c *channel) responseMessageReceived() error {
-	if c.direction == channelInbound {
-		return errors.New("ssh: channel response message received on inbound channel")
-	}
-	if c.decided {
-		return errors.New("ssh: duplicate response received for channel")
-	}
-	c.decided = true
-	return nil
-}
-
-func (c *channel) handlePacket(packet []byte) error {
-	switch packet[0] {
-	case msgChannelData, msgChannelExtendedData:
-		return c.handleData(packet)
-	case msgChannelClose:
-		c.sendMessage(channelCloseMsg{PeersId: c.remoteId})
-		c.mux.chanList.remove(c.localId)
-		c.close()
-		return nil
-	case msgChannelEOF:
-		// RFC 4254 is mute on how EOF affects dataExt messages but
-		// it is logical to signal EOF at the same time.
-		c.extPending.eof()
-		c.pending.eof()
-		return nil
-	}
-
-	decoded, err := decode(packet)
-	if err != nil {
-		return err
-	}
-
-	switch msg := decoded.(type) {
-	case *channelOpenFailureMsg:
-		if err := c.responseMessageReceived(); err != nil {
-			return err
-		}
-		c.mux.chanList.remove(msg.PeersId)
-		c.msg <- msg
-	case *channelOpenConfirmMsg:
-		if err := c.responseMessageReceived(); err != nil {
-			return err
-		}
-		if msg.MaxPacketSize < minPacketLength || msg.MaxPacketSize > 1<<31 {
-			return fmt.Errorf("ssh: invalid MaxPacketSize %d from peer", msg.MaxPacketSize)
-		}
-		c.remoteId = msg.MyId
-		c.maxRemotePayload = msg.MaxPacketSize
-		c.remoteWin.add(msg.MyWindow)
-		c.msg <- msg
-	case *windowAdjustMsg:
-		if !c.remoteWin.add(msg.AdditionalBytes) {
-			return fmt.Errorf("ssh: invalid window update for %d bytes", msg.AdditionalBytes)
-		}
-	case *channelRequestMsg:
-		req := Request{
-			Type:      msg.Request,
-			WantReply: msg.WantReply,
-			Payload:   msg.RequestSpecificData,
-			ch:        c,
-		}
-
-		c.incomingRequests <- &req
-	default:
-		c.msg <- msg
-	}
-	return nil
-}
-
-func (m *mux) newChannel(chanType string, direction channelDirection, extraData []byte) *channel {
-	ch := &channel{
-		remoteWin:        window{Cond: newCond()},
-		myWindow:         channelWindowSize,
-		pending:          newBuffer(),
-		extPending:       newBuffer(),
-		direction:        direction,
-		incomingRequests: make(chan *Request, chanSize),
-		msg:              make(chan interface{}, chanSize),
-		chanType:         chanType,
-		extraData:        extraData,
-		mux:              m,
-		packetPool:       make(map[uint32][]byte),
-	}
-	ch.localId = m.chanList.add(ch)
-	return ch
-}
-
-var errUndecided = errors.New("ssh: must Accept or Reject channel")
-var errDecidedAlready = errors.New("ssh: can call Accept or Reject only once")
-
-type extChannel struct {
-	code uint32
-	ch   *channel
-}
-
-func (e *extChannel) Write(data []byte) (n int, err error) {
-	return e.ch.WriteExtended(data, e.code)
-}
-
-func (e *extChannel) Read(data []byte) (n int, err error) {
-	return e.ch.ReadExtended(data, e.code)
-}
-
-func (c *channel) Accept() (Channel, <-chan *Request, error) {
-	if c.decided {
-		return nil, nil, errDecidedAlready
-	}
-	c.maxIncomingPayload = channelMaxPacket
-	confirm := channelOpenConfirmMsg{
-		PeersId:       c.remoteId,
-		MyId:          c.localId,
-		MyWindow:      c.myWindow,
-		MaxPacketSize: c.maxIncomingPayload,
-	}
-	c.decided = true
-	if err := c.sendMessage(confirm); err != nil {
-		return nil, nil, err
-	}
-
-	return c, c.incomingRequests, nil
-}
-
-func (ch *channel) Reject(reason RejectionReason, message string) error {
-	if ch.decided {
-		return errDecidedAlready
-	}
-	reject := channelOpenFailureMsg{
-		PeersId:  ch.remoteId,
-		Reason:   reason,
-		Message:  message,
-		Language: "en",
-	}
-	ch.decided = true
-	return ch.sendMessage(reject)
-}
-
-func (ch *channel) Read(data []byte) (int, error) {
-	if !ch.decided {
-		return 0, errUndecided
-	}
-	return ch.ReadExtended(data, 0)
-}
-
-func (ch *channel) Write(data []byte) (int, error) {
-	if !ch.decided {
-		return 0, errUndecided
-	}
-	return ch.WriteExtended(data, 0)
-}
-
-func (ch *channel) CloseWrite() error {
-	if !ch.decided {
-		return errUndecided
-	}
-	ch.sentEOF = true
-	return ch.sendMessage(channelEOFMsg{
-		PeersId: ch.remoteId})
-}
-
-func (ch *channel) Close() error {
-	if !ch.decided {
-		return errUndecided
-	}
-
-	return ch.sendMessage(channelCloseMsg{
-		PeersId: ch.remoteId})
-}
-
-// Extended returns an io.ReadWriter that sends and receives data on the given,
-// SSH extended stream. Such streams are used, for example, for stderr.
-func (ch *channel) Extended(code uint32) io.ReadWriter {
-	if !ch.decided {
-		return nil
-	}
-	return &extChannel{code, ch}
-}
-
-func (ch *channel) Stderr() io.ReadWriter {
-	return ch.Extended(1)
-}
-
-func (ch *channel) SendRequest(name string, wantReply bool, payload []byte) (bool, error) {
-	if !ch.decided {
-		return false, errUndecided
-	}
-
-	if wantReply {
-		ch.sentRequestMu.Lock()
-		defer ch.sentRequestMu.Unlock()
-	}
-
-	msg := channelRequestMsg{
-		PeersId:             ch.remoteId,
-		Request:             name,
-		WantReply:           wantReply,
-		RequestSpecificData: payload,
-	}
-
-	if err := ch.sendMessage(msg); err != nil {
-		return false, err
-	}
-
-	if wantReply {
-		m, ok := (<-ch.msg)
-		if !ok {
-			return false, io.EOF
-		}
-		switch m.(type) {
-		case *channelRequestFailureMsg:
-			return false, nil
-		case *channelRequestSuccessMsg:
-			return true, nil
-		default:
-			return false, fmt.Errorf("ssh: unexpected response to channel request: %#v", m)
-		}
-	}
-
-	return false, nil
-}
-
-// ackRequest either sends an ack or nack to the channel request.
-func (ch *channel) ackRequest(ok bool) error {
-	if !ch.decided {
-		return errUndecided
-	}
-
-	var msg interface{}
-	if !ok {
-		msg = channelRequestFailureMsg{
-			PeersId: ch.remoteId,
-		}
-	} else {
-		msg = channelRequestSuccessMsg{
-			PeersId: ch.remoteId,
-		}
-	}
-	return ch.sendMessage(msg)
-}
-
-func (ch *channel) ChannelType() string {
-	return ch.chanType
-}
-
-func (ch *channel) ExtraData() []byte {
-	return ch.extraData
-}

vendor/golang.org/x/crypto/ssh/cipher.go

@@ -1,629 +0,0 @@
-// Copyright 2011 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package ssh
-
-import (
-	"crypto/aes"
-	"crypto/cipher"
-	"crypto/des"
-	"crypto/rc4"
-	"crypto/subtle"
-	"encoding/binary"
-	"errors"
-	"fmt"
-	"hash"
-	"io"
-	"io/ioutil"
-)
-
-const (
-	packetSizeMultiple = 16 // TODO(huin) this should be determined by the cipher.
-
-	// RFC 4253 section 6.1 defines a minimum packet size of 32768 that implementations
-	// MUST be able to process (plus a few more kilobytes for padding and mac). The RFC
-	// indicates implementations SHOULD be able to handle larger packet sizes, but then
-	// waffles on about reasonable limits.
-	//
-	// OpenSSH caps their maxPacket at 256kB so we choose to do
-	// the same. maxPacket is also used to ensure that uint32
-	// length fields do not overflow, so it should remain well
-	// below 4G.
-	maxPacket = 256 * 1024
-)
-
-// noneCipher implements cipher.Stream and provides no encryption. It is used
-// by the transport before the first key-exchange.
-type noneCipher struct{}
-
-func (c noneCipher) XORKeyStream(dst, src []byte) {
-	copy(dst, src)
-}
-
-func newAESCTR(key, iv []byte) (cipher.Stream, error) {
-	c, err := aes.NewCipher(key)
-	if err != nil {
-		return nil, err
-	}
-	return cipher.NewCTR(c, iv), nil
-}
-
-func newRC4(key, iv []byte) (cipher.Stream, error) {
-	return rc4.NewCipher(key)
-}
-
-type streamCipherMode struct {
-	keySize    int
-	ivSize     int
-	skip       int
-	createFunc func(key, iv []byte) (cipher.Stream, error)
-}
-
-func (c *streamCipherMode) createStream(key, iv []byte) (cipher.Stream, error) {
-	if len(key) < c.keySize {
-		panic("ssh: key length too small for cipher")
-	}
-	if len(iv) < c.ivSize {
-		panic("ssh: iv too small for cipher")
-	}
-
-	stream, err := c.createFunc(key[:c.keySize], iv[:c.ivSize])
-	if err != nil {
-		return nil, err
-	}
-
-	var streamDump []byte
-	if c.skip > 0 {
-		streamDump = make([]byte, 512)
-	}
-
-	for remainingToDump := c.skip; remainingToDump > 0; {
-		dumpThisTime := remainingToDump
-		if dumpThisTime > len(streamDump) {
-			dumpThisTime = len(streamDump)
-		}
-		stream.XORKeyStream(streamDump[:dumpThisTime], streamDump[:dumpThisTime])
-		remainingToDump -= dumpThisTime
-	}
-
-	return stream, nil
-}
-
-// cipherModes documents properties of supported ciphers. Ciphers not included
-// are not supported and will not be negotiated, even if explicitly requested in
-// ClientConfig.Crypto.Ciphers.
-var cipherModes = map[string]*streamCipherMode{
-	// Ciphers from RFC4344, which introduced many CTR-based ciphers. Algorithms
-	// are defined in the order specified in the RFC.
-	"aes128-ctr": {16, aes.BlockSize, 0, newAESCTR},
-	"aes192-ctr": {24, aes.BlockSize, 0, newAESCTR},
-	"aes256-ctr": {32, aes.BlockSize, 0, newAESCTR},
-
-	// Ciphers from RFC4345, which introduces security-improved arcfour ciphers.
-	// They are defined in the order specified in the RFC.
-	"arcfour128": {16, 0, 1536, newRC4},
-	"arcfour256": {32, 0, 1536, newRC4},
-
-	// Cipher defined in RFC 4253, which describes SSH Transport Layer Protocol.
-	// Note that this cipher is not safe, as stated in RFC 4253: "Arcfour (and
-	// RC4) has problems with weak keys, and should be used with caution."
-	// RFC4345 introduces improved versions of Arcfour.
-	"arcfour": {16, 0, 0, newRC4},
-
-	// AES-GCM is not a stream cipher, so it is constructed with a
-	// special case. If we add any more non-stream ciphers, we
-	// should invest a cleaner way to do this.
-	gcmCipherID: {16, 12, 0, nil},
-
-	// CBC mode is insecure and so is not included in the default config.
-	// (See http://www.isg.rhul.ac.uk/~kp/SandPfinal.pdf). If absolutely
-	// needed, it's possible to specify a custom Config to enable it.
-	// You should expect that an active attacker can recover plaintext if
-	// you do.
-	aes128cbcID: {16, aes.BlockSize, 0, nil},
-
-	// 3des-cbc is insecure and is disabled by default.
-	tripledescbcID: {24, des.BlockSize, 0, nil},
-}
-
-// prefixLen is the length of the packet prefix that contains the packet length
-// and number of padding bytes.
-const prefixLen = 5
-
-// streamPacketCipher is a packetCipher using a stream cipher.
-type streamPacketCipher struct {
-	mac    hash.Hash
-	cipher cipher.Stream
-	etm    bool
-
-	// The following members are to avoid per-packet allocations.
-	prefix      [prefixLen]byte
-	seqNumBytes [4]byte
-	padding     [2 * packetSizeMultiple]byte
-	packetData  []byte
-	macResult   []byte
-}
-
-// readPacket reads and decrypt a single packet from the reader argument.
-func (s *streamPacketCipher) readPacket(seqNum uint32, r io.Reader) ([]byte, error) {
-	if _, err := io.ReadFull(r, s.prefix[:]); err != nil {
-		return nil, err
-	}
-
-	var encryptedPaddingLength [1]byte
-	if s.mac != nil && s.etm {
-		copy(encryptedPaddingLength[:], s.prefix[4:5])
-		s.cipher.XORKeyStream(s.prefix[4:5], s.prefix[4:5])
-	} else {
-		s.cipher.XORKeyStream(s.prefix[:], s.prefix[:])
-	}
-
-	length := binary.BigEndian.Uint32(s.prefix[0:4])
-	paddingLength := uint32(s.prefix[4])
-
-	var macSize uint32
-	if s.mac != nil {
-		s.mac.Reset()
-		binary.BigEndian.PutUint32(s.seqNumBytes[:], seqNum)
-		s.mac.Write(s.seqNumBytes[:])
-		if s.etm {
-			s.mac.Write(s.prefix[:4])
-			s.mac.Write(encryptedPaddingLength[:])
-		} else {
-			s.mac.Write(s.prefix[:])
-		}
-		macSize = uint32(s.mac.Size())
-	}
-
-	if length <= paddingLength+1 {
-		return nil, errors.New("ssh: invalid packet length, packet too small")
-	}
-
-	if length > maxPacket {
-		return nil, errors.New("ssh: invalid packet length, packet too large")
-	}
-
-	// the maxPacket check above ensures that length-1+macSize
-	// does not overflow.
-	if uint32(cap(s.packetData)) < length-1+macSize {
-		s.packetData = make([]byte, length-1+macSize)
-	} else {
-		s.packetData = s.packetData[:length-1+macSize]
-	}
-
-	if _, err := io.ReadFull(r, s.packetData); err != nil {
-		return nil, err
-	}
-	mac := s.packetData[length-1:]
-	data := s.packetData[:length-1]
-
-	if s.mac != nil && s.etm {
-		s.mac.Write(data)
-	}
-
-	s.cipher.XORKeyStream(data, data)
-
-	if s.mac != nil {
-		if !s.etm {
-			s.mac.Write(data)
-		}
-		s.macResult = s.mac.Sum(s.macResult[:0])
-		if subtle.ConstantTimeCompare(s.macResult, mac) != 1 {
-			return nil, errors.New("ssh: MAC failure")
-		}
-	}
-
-	return s.packetData[:length-paddingLength-1], nil
-}
-
-// writePacket encrypts and sends a packet of data to the writer argument
-func (s *streamPacketCipher) writePacket(seqNum uint32, w io.Writer, rand io.Reader, packet []byte) error {
-	if len(packet) > maxPacket {
-		return errors.New("ssh: packet too large")
-	}
-
-	aadlen := 0
-	if s.mac != nil && s.etm {
-		// packet length is not encrypted for EtM modes
-		aadlen = 4
-	}
-
-	paddingLength := packetSizeMultiple - (prefixLen+len(packet)-aadlen)%packetSizeMultiple
-	if paddingLength < 4 {
-		paddingLength += packetSizeMultiple
-	}
-
-	length := len(packet) + 1 + paddingLength
-	binary.BigEndian.PutUint32(s.prefix[:], uint32(length))
-	s.prefix[4] = byte(paddingLength)
-	padding := s.padding[:paddingLength]
-	if _, err := io.ReadFull(rand, padding); err != nil {
-		return err
-	}
-
-	if s.mac != nil {
-		s.mac.Reset()
-		binary.BigEndian.PutUint32(s.seqNumBytes[:], seqNum)
-		s.mac.Write(s.seqNumBytes[:])
-
-		if s.etm {
-			// For EtM algorithms, the packet length must stay unencrypted,
-			// but the following data (padding length) must be encrypted
-			s.cipher.XORKeyStream(s.prefix[4:5], s.prefix[4:5])
-		}
-
-		s.mac.Write(s.prefix[:])
-
-		if !s.etm {
-			// For non-EtM algorithms, the algorithm is applied on unencrypted data
-			s.mac.Write(packet)
-			s.mac.Write(padding)
-		}
-	}
-
-	if !(s.mac != nil && s.etm) {
-		// For EtM algorithms, the padding length has already been encrypted
-		// and the packet length must remain unencrypted
-		s.cipher.XORKeyStream(s.prefix[:], s.prefix[:])
-	}
-
-	s.cipher.XORKeyStream(packet, packet)
-	s.cipher.XORKeyStream(padding, padding)
-
-	if s.mac != nil && s.etm {
-		// For EtM algorithms, packet and padding must be encrypted
-		s.mac.Write(packet)
-		s.mac.Write(padding)
-	}
-
-	if _, err := w.Write(s.prefix[:]); err != nil {
-		return err
-	}
-	if _, err := w.Write(packet); err != nil {
-		return err
-	}
-	if _, err := w.Write(padding); err != nil {
-		return err
-	}
-
-	if s.mac != nil {
-		s.macResult = s.mac.Sum(s.macResult[:0])
-		if _, err := w.Write(s.macResult); err != nil {
-			return err
-		}
-	}
-
-	return nil
-}
-
-type gcmCipher struct {
-	aead   cipher.AEAD
-	prefix [4]byte
-	iv     []byte
-	buf    []byte
-}
-
-func newGCMCipher(iv, key, macKey []byte) (packetCipher, error) {
-	c, err := aes.NewCipher(key)
-	if err != nil {
-		return nil, err
-	}
-
-	aead, err := cipher.NewGCM(c)
-	if err != nil {
-		return nil, err
-	}
-
-	return &gcmCipher{
-		aead: aead,
-		iv:   iv,
-	}, nil
-}
-
-const gcmTagSize = 16
-
-func (c *gcmCipher) writePacket(seqNum uint32, w io.Writer, rand io.Reader, packet []byte) error {
-	// Pad out to multiple of 16 bytes. This is different from the
-	// stream cipher because that encrypts the length too.
-	padding := byte(packetSizeMultiple - (1+len(packet))%packetSizeMultiple)
-	if padding < 4 {
-		padding += packetSizeMultiple
-	}
-
-	length := uint32(len(packet) + int(padding) + 1)
-	binary.BigEndian.PutUint32(c.prefix[:], length)
-	if _, err := w.Write(c.prefix[:]); err != nil {
-		return err
-	}
-
-	if cap(c.buf) < int(length) {
-		c.buf = make([]byte, length)
-	} else {
-		c.buf = c.buf[:length]
-	}
-
-	c.buf[0] = padding
-	copy(c.buf[1:], packet)
-	if _, err := io.ReadFull(rand, c.buf[1+len(packet):]); err != nil {
-		return err
-	}
-	c.buf = c.aead.Seal(c.buf[:0], c.iv, c.buf, c.prefix[:])
-	if _, err := w.Write(c.buf); err != nil {
-		return err
-	}
-	c.incIV()
-
-	return nil
-}
-
-func (c *gcmCipher) incIV() {
-	for i := 4 + 7; i >= 4; i-- {
-		c.iv[i]++
-		if c.iv[i] != 0 {
-			break
-		}
-	}
-}
-
-func (c *gcmCipher) readPacket(seqNum uint32, r io.Reader) ([]byte, error) {
-	if _, err := io.ReadFull(r, c.prefix[:]); err != nil {
-		return nil, err
-	}
-	length := binary.BigEndian.Uint32(c.prefix[:])
-	if length > maxPacket {
-		return nil, errors.New("ssh: max packet length exceeded.")
-	}
-
-	if cap(c.buf) < int(length+gcmTagSize) {
-		c.buf = make([]byte, length+gcmTagSize)
-	} else {
-		c.buf = c.buf[:length+gcmTagSize]
-	}
-
-	if _, err := io.ReadFull(r, c.buf); err != nil {
-		return nil, err
-	}
-
-	plain, err := c.aead.Open(c.buf[:0], c.iv, c.buf, c.prefix[:])
-	if err != nil {
-		return nil, err
-	}
-	c.incIV()
-
-	padding := plain[0]
-	if padding < 4 {
-		// padding is a byte, so it automatically satisfies
-		// the maximum size, which is 255.
-		return nil, fmt.Errorf("ssh: illegal padding %d", padding)
-	}
-
-	if int(padding+1) >= len(plain) {
-		return nil, fmt.Errorf("ssh: padding %d too large", padding)
-	}
-	plain = plain[1 : length-uint32(padding)]
-	return plain, nil
-}
-
-// cbcCipher implements aes128-cbc cipher defined in RFC 4253 section 6.1
-type cbcCipher struct {
-	mac       hash.Hash
-	macSize   uint32
-	decrypter cipher.BlockMode
-	encrypter cipher.BlockMode
-
-	// The following members are to avoid per-packet allocations.
-	seqNumBytes [4]byte
-	packetData  []byte
-	macResult   []byte
-
-	// Amount of data we should still read to hide which
-	// verification error triggered.
-	oracleCamouflage uint32
-}
-
-func newCBCCipher(c cipher.Block, iv, key, macKey []byte, algs directionAlgorithms) (packetCipher, error) {
-	cbc := &cbcCipher{
-		mac:        macModes[algs.MAC].new(macKey),
-		decrypter:  cipher.NewCBCDecrypter(c, iv),
-		encrypter:  cipher.NewCBCEncrypter(c, iv),
-		packetData: make([]byte, 1024),
-	}
-	if cbc.mac != nil {
-		cbc.macSize = uint32(cbc.mac.Size())
-	}
-
-	return cbc, nil
-}
-
-func newAESCBCCipher(iv, key, macKey []byte, algs directionAlgorithms) (packetCipher, error) {
-	c, err := aes.NewCipher(key)
-	if err != nil {
-		return nil, err
-	}
-
-	cbc, err := newCBCCipher(c, iv, key, macKey, algs)
-	if err != nil {
-		return nil, err
-	}
-
-	return cbc, nil
-}
-
-func newTripleDESCBCCipher(iv, key, macKey []byte, algs directionAlgorithms) (packetCipher, error) {
-	c, err := des.NewTripleDESCipher(key)
-	if err != nil {
-		return nil, err
-	}
-
-	cbc, err := newCBCCipher(c, iv, key, macKey, algs)
-	if err != nil {
-		return nil, err
-	}
-
-	return cbc, nil
-}
-
-func maxUInt32(a, b int) uint32 {
-	if a > b {
-		return uint32(a)
-	}
-	return uint32(b)
-}
-
-const (
-	cbcMinPacketSizeMultiple = 8
-	cbcMinPacketSize         = 16
-	cbcMinPaddingSize        = 4
-)
-
-// cbcError represents a verification error that may leak information.
-type cbcError string
-
-func (e cbcError) Error() string { return string(e) }
-
-func (c *cbcCipher) readPacket(seqNum uint32, r io.Reader) ([]byte, error) {
-	p, err := c.readPacketLeaky(seqNum, r)
-	if err != nil {
-		if _, ok := err.(cbcError); ok {
-			// Verification error: read a fixed amount of
-			// data, to make distinguishing between
-			// failing MAC and failing length check more
-			// difficult.
-			io.CopyN(ioutil.Discard, r, int64(c.oracleCamouflage))
-		}
-	}
-	return p, err
-}
-
-func (c *cbcCipher) readPacketLeaky(seqNum uint32, r io.Reader) ([]byte, error) {
-	blockSize := c.decrypter.BlockSize()
-
-	// Read the header, which will include some of the subsequent data in the
-	// case of block ciphers - this is copied back to the payload later.
-	// How many bytes of payload/padding will be read with this first read.
-	firstBlockLength := uint32((prefixLen + blockSize - 1) / blockSize * blockSize)
-	firstBlock := c.packetData[:firstBlockLength]
-	if _, err := io.ReadFull(r, firstBlock); err != nil {
-		return nil, err
-	}
-
-	c.oracleCamouflage = maxPacket + 4 + c.macSize - firstBlockLength
-
-	c.decrypter.CryptBlocks(firstBlock, firstBlock)
-	length := binary.BigEndian.Uint32(firstBlock[:4])
-	if length > maxPacket {
-		return nil, cbcError("ssh: packet too large")
-	}
-	if length+4 < maxUInt32(cbcMinPacketSize, blockSize) {
-		// The minimum size of a packet is 16 (or the cipher block size, whichever
-		// is larger) bytes.
-		return nil, cbcError("ssh: packet too small")
-	}
-	// The length of the packet (including the length field but not the MAC) must
-	// be a multiple of the block size or 8, whichever is larger.
-	if (length+4)%maxUInt32(cbcMinPacketSizeMultiple, blockSize) != 0 {
-		return nil, cbcError("ssh: invalid packet length multiple")
-	}
-
-	paddingLength := uint32(firstBlock[4])
-	if paddingLength < cbcMinPaddingSize || length <= paddingLength+1 {
-		return nil, cbcError("ssh: invalid packet length")
-	}
-
-	// Positions within the c.packetData buffer:
-	macStart := 4 + length
-	paddingStart := macStart - paddingLength
-
-	// Entire packet size, starting before length, ending at end of mac.
-	entirePacketSize := macStart + c.macSize
-
-	// Ensure c.packetData is large enough for the entire packet data.
-	if uint32(cap(c.packetData)) < entirePacketSize {
-		// Still need to upsize and copy, but this should be rare at runtime, only
-		// on upsizing the packetData buffer.
-		c.packetData = make([]byte, entirePacketSize)
-		copy(c.packetData, firstBlock)
-	} else {
-		c.packetData = c.packetData[:entirePacketSize]
-	}
-
-	if n, err := io.ReadFull(r, c.packetData[firstBlockLength:]); err != nil {
-		return nil, err
-	} else {
-		c.oracleCamouflage -= uint32(n)
-	}
-
-	remainingCrypted := c.packetData[firstBlockLength:macStart]
-	c.decrypter.CryptBlocks(remainingCrypted, remainingCrypted)
-
-	mac := c.packetData[macStart:]
-	if c.mac != nil {
-		c.mac.Reset()
-		binary.BigEndian.PutUint32(c.seqNumBytes[:], seqNum)
-		c.mac.Write(c.seqNumBytes[:])
-		c.mac.Write(c.packetData[:macStart])
-		c.macResult = c.mac.Sum(c.macResult[:0])
-		if subtle.ConstantTimeCompare(c.macResult, mac) != 1 {
-			return nil, cbcError("ssh: MAC failure")
-		}
-	}
-
-	return c.packetData[prefixLen:paddingStart], nil
-}
-
-func (c *cbcCipher) writePacket(seqNum uint32, w io.Writer, rand io.Reader, packet []byte) error {
-	effectiveBlockSize := maxUInt32(cbcMinPacketSizeMultiple, c.encrypter.BlockSize())
-
-	// Length of encrypted portion of the packet (header, payload, padding).
-	// Enforce minimum padding and packet size.
-	encLength := maxUInt32(prefixLen+len(packet)+cbcMinPaddingSize, cbcMinPaddingSize)
-	// Enforce block size.
-	encLength = (encLength + effectiveBlockSize - 1) / effectiveBlockSize * effectiveBlockSize
-
-	length := encLength - 4
-	paddingLength := int(length) - (1 + len(packet))
-
-	// Overall buffer contains: header, payload, padding, mac.
-	// Space for the MAC is reserved in the capacity but not the slice length.
-	bufferSize := encLength + c.macSize
-	if uint32(cap(c.packetData)) < bufferSize {
-		c.packetData = make([]byte, encLength, bufferSize)
-	} else {
-		c.packetData = c.packetData[:encLength]
-	}
-
-	p := c.packetData
-
-	// Packet header.
-	binary.BigEndian.PutUint32(p, length)
-	p = p[4:]
-	p[0] = byte(paddingLength)
-
-	// Payload.
-	p = p[1:]
-	copy(p, packet)
-
-	// Padding.
-	p = p[len(packet):]
-	if _, err := io.ReadFull(rand, p); err != nil {
-		return err
-	}
-
-	if c.mac != nil {
-		c.mac.Reset()
-		binary.BigEndian.PutUint32(c.seqNumBytes[:], seqNum)
-		c.mac.Write(c.seqNumBytes[:])
-		c.mac.Write(c.packetData)
-		// The MAC is now appended into the capacity reserved for it earlier.
-		c.packetData = c.mac.Sum(c.packetData)
-	}
-
-	c.encrypter.CryptBlocks(c.packetData[:encLength], c.packetData[:encLength])
-
-	if _, err := w.Write(c.packetData); err != nil {
-		return err
-	}
-
-	return nil
-}

vendor/golang.org/x/crypto/ssh/client.go

@@ -1,257 +0,0 @@
-// Copyright 2011 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package ssh
-
-import (
-	"bytes"
-	"errors"
-	"fmt"
-	"net"
-	"sync"
-	"time"
-)
-
-// Client implements a traditional SSH client that supports shells,
-// subprocesses, TCP port/streamlocal forwarding and tunneled dialing.
-type Client struct {
-	Conn
-
-	forwards        forwardList // forwarded tcpip connections from the remote side
-	mu              sync.Mutex
-	channelHandlers map[string]chan NewChannel
-}
-
-// HandleChannelOpen returns a channel on which NewChannel requests
-// for the given type are sent. If the type already is being handled,
-// nil is returned. The channel is closed when the connection is closed.
-func (c *Client) HandleChannelOpen(channelType string) <-chan NewChannel {
-	c.mu.Lock()
-	defer c.mu.Unlock()
-	if c.channelHandlers == nil {
-		// The SSH channel has been closed.
-		c := make(chan NewChannel)
-		close(c)
-		return c
-	}
-
-	ch := c.channelHandlers[channelType]
-	if ch != nil {
-		return nil
-	}
-
-	ch = make(chan NewChannel, chanSize)
-	c.channelHandlers[channelType] = ch
-	return ch
-}
-
-// NewClient creates a Client on top of the given connection.
-func NewClient(c Conn, chans <-chan NewChannel, reqs <-chan *Request) *Client {
-	conn := &Client{
-		Conn:            c,
-		channelHandlers: make(map[string]chan NewChannel, 1),
-	}
-
-	go conn.handleGlobalRequests(reqs)
-	go conn.handleChannelOpens(chans)
-	go func() {
-		conn.Wait()
-		conn.forwards.closeAll()
-	}()
-	go conn.forwards.handleChannels(conn.HandleChannelOpen("forwarded-tcpip"))
-	go conn.forwards.handleChannels(conn.HandleChannelOpen("forwarded-streamlocal@openssh.com"))
-	return conn
-}
-
-// NewClientConn establishes an authenticated SSH connection using c
-// as the underlying transport.  The Request and NewChannel channels
-// must be serviced or the connection will hang.
-func NewClientConn(c net.Conn, addr string, config *ClientConfig) (Conn, <-chan NewChannel, <-chan *Request, error) {
-	fullConf := *config
-	fullConf.SetDefaults()
-	if fullConf.HostKeyCallback == nil {
-		c.Close()
-		return nil, nil, nil, errors.New("ssh: must specify HostKeyCallback")
-	}
-
-	conn := &connection{
-		sshConn: sshConn{conn: c},
-	}
-
-	if err := conn.clientHandshake(addr, &fullConf); err != nil {
-		c.Close()
-		return nil, nil, nil, fmt.Errorf("ssh: handshake failed: %v", err)
-	}
-	conn.mux = newMux(conn.transport)
-	return conn, conn.mux.incomingChannels, conn.mux.incomingRequests, nil
-}
-
-// clientHandshake performs the client side key exchange. See RFC 4253 Section
-// 7.
-func (c *connection) clientHandshake(dialAddress string, config *ClientConfig) error {
-	if config.ClientVersion != "" {
-		c.clientVersion = []byte(config.ClientVersion)
-	} else {
-		c.clientVersion = []byte(packageVersion)
-	}
-	var err error
-	c.serverVersion, err = exchangeVersions(c.sshConn.conn, c.clientVersion)
-	if err != nil {
-		return err
-	}
-
-	c.transport = newClientTransport(
-		newTransport(c.sshConn.conn, config.Rand, true /* is client */),
-		c.clientVersion, c.serverVersion, config, dialAddress, c.sshConn.RemoteAddr())
-	if err := c.transport.waitSession(); err != nil {
-		return err
-	}
-
-	c.sessionID = c.transport.getSessionID()
-	return c.clientAuthenticate(config)
-}
-
-// verifyHostKeySignature verifies the host key obtained in the key
-// exchange.
-func verifyHostKeySignature(hostKey PublicKey, result *kexResult) error {
-	sig, rest, ok := parseSignatureBody(result.Signature)
-	if len(rest) > 0 || !ok {
-		return errors.New("ssh: signature parse error")
-	}
-
-	return hostKey.Verify(result.H, sig)
-}
-
-// NewSession opens a new Session for this client. (A session is a remote
-// execution of a program.)
-func (c *Client) NewSession() (*Session, error) {
-	ch, in, err := c.OpenChannel("session", nil)
-	if err != nil {
-		return nil, err
-	}
-	return newSession(ch, in)
-}
-
-func (c *Client) handleGlobalRequests(incoming <-chan *Request) {
-	for r := range incoming {
-		// This handles keepalive messages and matches
-		// the behaviour of OpenSSH.
-		r.Reply(false, nil)
-	}
-}
-
-// handleChannelOpens channel open messages from the remote side.
-func (c *Client) handleChannelOpens(in <-chan NewChannel) {
-	for ch := range in {
-		c.mu.Lock()
-		handler := c.channelHandlers[ch.ChannelType()]
-		c.mu.Unlock()
-
-		if handler != nil {
-			handler <- ch
-		} else {
-			ch.Reject(UnknownChannelType, fmt.Sprintf("unknown channel type: %v", ch.ChannelType()))
-		}
-	}
-
-	c.mu.Lock()
-	for _, ch := range c.channelHandlers {
-		close(ch)
-	}
-	c.channelHandlers = nil
-	c.mu.Unlock()
-}
-
-// Dial starts a client connection to the given SSH server. It is a
-// convenience function that connects to the given network address,
-// initiates the SSH handshake, and then sets up a Client.  For access
-// to incoming channels and requests, use net.Dial with NewClientConn
-// instead.
-func Dial(network, addr string, config *ClientConfig) (*Client, error) {
-	conn, err := net.DialTimeout(network, addr, config.Timeout)
-	if err != nil {
-		return nil, err
-	}
-	c, chans, reqs, err := NewClientConn(conn, addr, config)
-	if err != nil {
-		return nil, err
-	}
-	return NewClient(c, chans, reqs), nil
-}
-
-// HostKeyCallback is the function type used for verifying server
-// keys.  A HostKeyCallback must return nil if the host key is OK, or
-// an error to reject it. It receives the hostname as passed to Dial
-// or NewClientConn. The remote address is the RemoteAddr of the
-// net.Conn underlying the the SSH connection.
-type HostKeyCallback func(hostname string, remote net.Addr, key PublicKey) error
-
-// A ClientConfig structure is used to configure a Client. It must not be
-// modified after having been passed to an SSH function.
-type ClientConfig struct {
-	// Config contains configuration that is shared between clients and
-	// servers.
-	Config
-
-	// User contains the username to authenticate as.
-	User string
-
-	// Auth contains possible authentication methods to use with the
-	// server. Only the first instance of a particular RFC 4252 method will
-	// be used during authentication.
-	Auth []AuthMethod
-
-	// HostKeyCallback is called during the cryptographic
-	// handshake to validate the server's host key. The client
-	// configuration must supply this callback for the connection
-	// to succeed. The functions InsecureIgnoreHostKey or
-	// FixedHostKey can be used for simplistic host key checks.
-	HostKeyCallback HostKeyCallback
-
-	// ClientVersion contains the version identification string that will
-	// be used for the connection. If empty, a reasonable default is used.
-	ClientVersion string
-
-	// HostKeyAlgorithms lists the key types that the client will
-	// accept from the server as host key, in order of
-	// preference. If empty, a reasonable default is used. Any
-	// string returned from PublicKey.Type method may be used, or
-	// any of the CertAlgoXxxx and KeyAlgoXxxx constants.
-	HostKeyAlgorithms []string
-
-	// Timeout is the maximum amount of time for the TCP connection to establish.
-	//
-	// A Timeout of zero means no timeout.
-	Timeout time.Duration
-}
-
-// InsecureIgnoreHostKey returns a function that can be used for
-// ClientConfig.HostKeyCallback to accept any host key. It should
-// not be used for production code.
-func InsecureIgnoreHostKey() HostKeyCallback {
-	return func(hostname string, remote net.Addr, key PublicKey) error {
-		return nil
-	}
-}
-
-type fixedHostKey struct {
-	key PublicKey
-}
-
-func (f *fixedHostKey) check(hostname string, remote net.Addr, key PublicKey) error {
-	if f.key == nil {
-		return fmt.Errorf("ssh: required host key was nil")
-	}
-	if !bytes.Equal(key.Marshal(), f.key.Marshal()) {
-		return fmt.Errorf("ssh: host key mismatch")
-	}
-	return nil
-}
-
-// FixedHostKey returns a function for use in
-// ClientConfig.HostKeyCallback to accept only a specific host key.
-func FixedHostKey(key PublicKey) HostKeyCallback {
-	hk := &fixedHostKey{key}
-	return hk.check
-}

vendor/golang.org/x/crypto/ssh/client_auth.go

@@ -1,486 +0,0 @@
-// Copyright 2011 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package ssh
-
-import (
-	"bytes"
-	"errors"
-	"fmt"
-	"io"
-)
-
-// clientAuthenticate authenticates with the remote server. See RFC 4252.
-func (c *connection) clientAuthenticate(config *ClientConfig) error {
-	// initiate user auth session
-	if err := c.transport.writePacket(Marshal(&serviceRequestMsg{serviceUserAuth})); err != nil {
-		return err
-	}
-	packet, err := c.transport.readPacket()
-	if err != nil {
-		return err
-	}
-	var serviceAccept serviceAcceptMsg
-	if err := Unmarshal(packet, &serviceAccept); err != nil {
-		return err
-	}
-
-	// during the authentication phase the client first attempts the "none" method
-	// then any untried methods suggested by the server.
-	tried := make(map[string]bool)
-	var lastMethods []string
-
-	sessionID := c.transport.getSessionID()
-	for auth := AuthMethod(new(noneAuth)); auth != nil; {
-		ok, methods, err := auth.auth(sessionID, config.User, c.transport, config.Rand)
-		if err != nil {
-			return err
-		}
-		if ok {
-			// success
-			return nil
-		}
-		tried[auth.method()] = true
-		if methods == nil {
-			methods = lastMethods
-		}
-		lastMethods = methods
-
-		auth = nil
-
-	findNext:
-		for _, a := range config.Auth {
-			candidateMethod := a.method()
-			if tried[candidateMethod] {
-				continue
-			}
-			for _, meth := range methods {
-				if meth == candidateMethod {
-					auth = a
-					break findNext
-				}
-			}
-		}
-	}
-	return fmt.Errorf("ssh: unable to authenticate, attempted methods %v, no supported methods remain", keys(tried))
-}
-
-func keys(m map[string]bool) []string {
-	s := make([]string, 0, len(m))
-
-	for key := range m {
-		s = append(s, key)
-	}
-	return s
-}
-
-// An AuthMethod represents an instance of an RFC 4252 authentication method.
-type AuthMethod interface {
-	// auth authenticates user over transport t.
-	// Returns true if authentication is successful.
-	// If authentication is not successful, a []string of alternative
-	// method names is returned. If the slice is nil, it will be ignored
-	// and the previous set of possible methods will be reused.
-	auth(session []byte, user string, p packetConn, rand io.Reader) (bool, []string, error)
-
-	// method returns the RFC 4252 method name.
-	method() string
-}
-
-// "none" authentication, RFC 4252 section 5.2.
-type noneAuth int
-
-func (n *noneAuth) auth(session []byte, user string, c packetConn, rand io.Reader) (bool, []string, error) {
-	if err := c.writePacket(Marshal(&userAuthRequestMsg{
-		User:    user,
-		Service: serviceSSH,
-		Method:  "none",
-	})); err != nil {
-		return false, nil, err
-	}
-
-	return handleAuthResponse(c)
-}
-
-func (n *noneAuth) method() string {
-	return "none"
-}
-
-// passwordCallback is an AuthMethod that fetches the password through
-// a function call, e.g. by prompting the user.
-type passwordCallback func() (password string, err error)
-
-func (cb passwordCallback) auth(session []byte, user string, c packetConn, rand io.Reader) (bool, []string, error) {
-	type passwordAuthMsg struct {
-		User     string `sshtype:"50"`
-		Service  string
-		Method   string
-		Reply    bool
-		Password string
-	}
-
-	pw, err := cb()
-	// REVIEW NOTE: is there a need to support skipping a password attempt?
-	// The program may only find out that the user doesn't have a password
-	// when prompting.
-	if err != nil {
-		return false, nil, err
-	}
-
-	if err := c.writePacket(Marshal(&passwordAuthMsg{
-		User:     user,
-		Service:  serviceSSH,
-		Method:   cb.method(),
-		Reply:    false,
-		Password: pw,
-	})); err != nil {
-		return false, nil, err
-	}
-
-	return handleAuthResponse(c)
-}
-
-func (cb passwordCallback) method() string {
-	return "password"
-}
-
-// Password returns an AuthMethod using the given password.
-func Password(secret string) AuthMethod {
-	return passwordCallback(func() (string, error) { return secret, nil })
-}
-
-// PasswordCallback returns an AuthMethod that uses a callback for
-// fetching a password.
-func PasswordCallback(prompt func() (secret string, err error)) AuthMethod {
-	return passwordCallback(prompt)
-}
-
-type publickeyAuthMsg struct {
-	User    string `sshtype:"50"`
-	Service string
-	Method  string
-	// HasSig indicates to the receiver packet that the auth request is signed and
-	// should be used for authentication of the request.
-	HasSig   bool
-	Algoname string
-	PubKey   []byte
-	// Sig is tagged with "rest" so Marshal will exclude it during
-	// validateKey
-	Sig []byte `ssh:"rest"`
-}
-
-// publicKeyCallback is an AuthMethod that uses a set of key
-// pairs for authentication.
-type publicKeyCallback func() ([]Signer, error)
-
-func (cb publicKeyCallback) method() string {
-	return "publickey"
-}
-
-func (cb publicKeyCallback) auth(session []byte, user string, c packetConn, rand io.Reader) (bool, []string, error) {
-	// Authentication is performed by sending an enquiry to test if a key is
-	// acceptable to the remote. If the key is acceptable, the client will
-	// attempt to authenticate with the valid key.  If not the client will repeat
-	// the process with the remaining keys.
-
-	signers, err := cb()
-	if err != nil {
-		return false, nil, err
-	}
-	var methods []string
-	for _, signer := range signers {
-		ok, err := validateKey(signer.PublicKey(), user, c)
-		if err != nil {
-			return false, nil, err
-		}
-		if !ok {
-			continue
-		}
-
-		pub := signer.PublicKey()
-		pubKey := pub.Marshal()
-		sign, err := signer.Sign(rand, buildDataSignedForAuth(session, userAuthRequestMsg{
-			User:    user,
-			Service: serviceSSH,
-			Method:  cb.method(),
-		}, []byte(pub.Type()), pubKey))
-		if err != nil {
-			return false, nil, err
-		}
-
-		// manually wrap the serialized signature in a string
-		s := Marshal(sign)
-		sig := make([]byte, stringLength(len(s)))
-		marshalString(sig, s)
-		msg := publickeyAuthMsg{
-			User:     user,
-			Service:  serviceSSH,
-			Method:   cb.method(),
-			HasSig:   true,
-			Algoname: pub.Type(),
-			PubKey:   pubKey,
-			Sig:      sig,
-		}
-		p := Marshal(&msg)
-		if err := c.writePacket(p); err != nil {
-			return false, nil, err
-		}
-		var success bool
-		success, methods, err = handleAuthResponse(c)
-		if err != nil {
-			return false, nil, err
-		}
-
-		// If authentication succeeds or the list of available methods does not
-		// contain the "publickey" method, do not attempt to authenticate with any
-		// other keys.  According to RFC 4252 Section 7, the latter can occur when
-		// additional authentication methods are required.
-		if success || !containsMethod(methods, cb.method()) {
-			return success, methods, err
-		}
-	}
-
-	return false, methods, nil
-}
-
-func containsMethod(methods []string, method string) bool {
-	for _, m := range methods {
-		if m == method {
-			return true
-		}
-	}
-
-	return false
-}
-
-// validateKey validates the key provided is acceptable to the server.
-func validateKey(key PublicKey, user string, c packetConn) (bool, error) {
-	pubKey := key.Marshal()
-	msg := publickeyAuthMsg{
-		User:     user,
-		Service:  serviceSSH,
-		Method:   "publickey",
-		HasSig:   false,
-		Algoname: key.Type(),
-		PubKey:   pubKey,
-	}
-	if err := c.writePacket(Marshal(&msg)); err != nil {
-		return false, err
-	}
-
-	return confirmKeyAck(key, c)
-}
-
-func confirmKeyAck(key PublicKey, c packetConn) (bool, error) {
-	pubKey := key.Marshal()
-	algoname := key.Type()
-
-	for {
-		packet, err := c.readPacket()
-		if err != nil {
-			return false, err
-		}
-		switch packet[0] {
-		case msgUserAuthBanner:
-			// TODO(gpaul): add callback to present the banner to the user
-		case msgUserAuthPubKeyOk:
-			var msg userAuthPubKeyOkMsg
-			if err := Unmarshal(packet, &msg); err != nil {
-				return false, err
-			}
-			if msg.Algo != algoname || !bytes.Equal(msg.PubKey, pubKey) {
-				return false, nil
-			}
-			return true, nil
-		case msgUserAuthFailure:
-			return false, nil
-		default:
-			return false, unexpectedMessageError(msgUserAuthSuccess, packet[0])
-		}
-	}
-}
-
-// PublicKeys returns an AuthMethod that uses the given key
-// pairs.
-func PublicKeys(signers ...Signer) AuthMethod {
-	return publicKeyCallback(func() ([]Signer, error) { return signers, nil })
-}
-
-// PublicKeysCallback returns an AuthMethod that runs the given
-// function to obtain a list of key pairs.
-func PublicKeysCallback(getSigners func() (signers []Signer, err error)) AuthMethod {
-	return publicKeyCallback(getSigners)
-}
-
-// handleAuthResponse returns whether the preceding authentication request succeeded
-// along with a list of remaining authentication methods to try next and
-// an error if an unexpected response was received.
-func handleAuthResponse(c packetConn) (bool, []string, error) {
-	for {
-		packet, err := c.readPacket()
-		if err != nil {
-			return false, nil, err
-		}
-
-		switch packet[0] {
-		case msgUserAuthBanner:
-			// TODO: add callback to present the banner to the user
-		case msgUserAuthFailure:
-			var msg userAuthFailureMsg
-			if err := Unmarshal(packet, &msg); err != nil {
-				return false, nil, err
-			}
-			return false, msg.Methods, nil
-		case msgUserAuthSuccess:
-			return true, nil, nil
-		default:
-			return false, nil, unexpectedMessageError(msgUserAuthSuccess, packet[0])
-		}
-	}
-}
-
-// KeyboardInteractiveChallenge should print questions, optionally
-// disabling echoing (e.g. for passwords), and return all the answers.
-// Challenge may be called multiple times in a single session. After
-// successful authentication, the server may send a challenge with no
-// questions, for which the user and instruction messages should be
-// printed.  RFC 4256 section 3.3 details how the UI should behave for
-// both CLI and GUI environments.
-type KeyboardInteractiveChallenge func(user, instruction string, questions []string, echos []bool) (answers []string, err error)
-
-// KeyboardInteractive returns an AuthMethod using a prompt/response
-// sequence controlled by the server.
-func KeyboardInteractive(challenge KeyboardInteractiveChallenge) AuthMethod {
-	return challenge
-}
-
-func (cb KeyboardInteractiveChallenge) method() string {
-	return "keyboard-interactive"
-}
-
-func (cb KeyboardInteractiveChallenge) auth(session []byte, user string, c packetConn, rand io.Reader) (bool, []string, error) {
-	type initiateMsg struct {
-		User       string `sshtype:"50"`
-		Service    string
-		Method     string
-		Language   string
-		Submethods string
-	}
-
-	if err := c.writePacket(Marshal(&initiateMsg{
-		User:    user,
-		Service: serviceSSH,
-		Method:  "keyboard-interactive",
-	})); err != nil {
-		return false, nil, err
-	}
-
-	for {
-		packet, err := c.readPacket()
-		if err != nil {
-			return false, nil, err
-		}
-
-		// like handleAuthResponse, but with less options.
-		switch packet[0] {
-		case msgUserAuthBanner:
-			// TODO: Print banners during userauth.
-			continue
-		case msgUserAuthInfoRequest:
-			// OK
-		case msgUserAuthFailure:
-			var msg userAuthFailureMsg
-			if err := Unmarshal(packet, &msg); err != nil {
-				return false, nil, err
-			}
-			return false, msg.Methods, nil
-		case msgUserAuthSuccess:
-			return true, nil, nil
-		default:
-			return false, nil, unexpectedMessageError(msgUserAuthInfoRequest, packet[0])
-		}
-
-		var msg userAuthInfoRequestMsg
-		if err := Unmarshal(packet, &msg); err != nil {
-			return false, nil, err
-		}
-
-		// Manually unpack the prompt/echo pairs.
-		rest := msg.Prompts
-		var prompts []string
-		var echos []bool
-		for i := 0; i < int(msg.NumPrompts); i++ {
-			prompt, r, ok := parseString(rest)
-			if !ok || len(r) == 0 {
-				return false, nil, errors.New("ssh: prompt format error")
-			}
-			prompts = append(prompts, string(prompt))
-			echos = append(echos, r[0] != 0)
-			rest = r[1:]
-		}
-
-		if len(rest) != 0 {
-			return false, nil, errors.New("ssh: extra data following keyboard-interactive pairs")
-		}
-
-		answers, err := cb(msg.User, msg.Instruction, prompts, echos)
-		if err != nil {
-			return false, nil, err
-		}
-
-		if len(answers) != len(prompts) {
-			return false, nil, errors.New("ssh: not enough answers from keyboard-interactive callback")
-		}
-		responseLength := 1 + 4
-		for _, a := range answers {
-			responseLength += stringLength(len(a))
-		}
-		serialized := make([]byte, responseLength)
-		p := serialized
-		p[0] = msgUserAuthInfoResponse
-		p = p[1:]
-		p = marshalUint32(p, uint32(len(answers)))
-		for _, a := range answers {
-			p = marshalString(p, []byte(a))
-		}
-
-		if err := c.writePacket(serialized); err != nil {
-			return false, nil, err
-		}
-	}
-}
-
-type retryableAuthMethod struct {
-	authMethod AuthMethod
-	maxTries   int
-}
-
-func (r *retryableAuthMethod) auth(session []byte, user string, c packetConn, rand io.Reader) (ok bool, methods []string, err error) {
-	for i := 0; r.maxTries <= 0 || i < r.maxTries; i++ {
-		ok, methods, err = r.authMethod.auth(session, user, c, rand)
-		if ok || err != nil { // either success or error terminate
-			return ok, methods, err
-		}
-	}
-	return ok, methods, err
-}
-
-func (r *retryableAuthMethod) method() string {
-	return r.authMethod.method()
-}
-
-// RetryableAuthMethod is a decorator for other auth methods enabling them to
-// be retried up to maxTries before considering that AuthMethod itself failed.
-// If maxTries is <= 0, will retry indefinitely
-//
-// This is useful for interactive clients using challenge/response type
-// authentication (e.g. Keyboard-Interactive, Password, etc) where the user
-// could mistype their response resulting in the server issuing a
-// SSH_MSG_USERAUTH_FAILURE (rfc4252 #8 [password] and rfc4256 #3.4
-// [keyboard-interactive]); Without this decorator, the non-retryable
-// AuthMethod would be removed from future consideration, and never tried again
-// (and so the user would never be able to retry their entry).
-func RetryableAuthMethod(auth AuthMethod, maxTries int) AuthMethod {
-	return &retryableAuthMethod{authMethod: auth, maxTries: maxTries}
-}

vendor/golang.org/x/crypto/ssh/common.go

@@ -1,373 +0,0 @@
-// Copyright 2011 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package ssh
-
-import (
-	"crypto"
-	"crypto/rand"
-	"fmt"
-	"io"
-	"math"
-	"sync"
-
-	_ "crypto/sha1"
-	_ "crypto/sha256"
-	_ "crypto/sha512"
-)
-
-// These are string constants in the SSH protocol.
-const (
-	compressionNone = "none"
-	serviceUserAuth = "ssh-userauth"
-	serviceSSH      = "ssh-connection"
-)
-
-// supportedCiphers specifies the supported ciphers in preference order.
-var supportedCiphers = []string{
-	"aes128-ctr", "aes192-ctr", "aes256-ctr",
-	"aes128-gcm@openssh.com",
-	"arcfour256", "arcfour128",
-}
-
-// supportedKexAlgos specifies the supported key-exchange algorithms in
-// preference order.
-var supportedKexAlgos = []string{
-	kexAlgoCurve25519SHA256,
-	// P384 and P521 are not constant-time yet, but since we don't
-	// reuse ephemeral keys, using them for ECDH should be OK.
-	kexAlgoECDH256, kexAlgoECDH384, kexAlgoECDH521,
-	kexAlgoDH14SHA1, kexAlgoDH1SHA1,
-}
-
-// supportedHostKeyAlgos specifies the supported host-key algorithms (i.e. methods
-// of authenticating servers) in preference order.
-var supportedHostKeyAlgos = []string{
-	CertAlgoRSAv01, CertAlgoDSAv01, CertAlgoECDSA256v01,
-	CertAlgoECDSA384v01, CertAlgoECDSA521v01, CertAlgoED25519v01,
-
-	KeyAlgoECDSA256, KeyAlgoECDSA384, KeyAlgoECDSA521,
-	KeyAlgoRSA, KeyAlgoDSA,
-
-	KeyAlgoED25519,
-}
-
-// supportedMACs specifies a default set of MAC algorithms in preference order.
-// This is based on RFC 4253, section 6.4, but with hmac-md5 variants removed
-// because they have reached the end of their useful life.
-var supportedMACs = []string{
-	"hmac-sha2-256-etm@openssh.com", "hmac-sha2-256", "hmac-sha1", "hmac-sha1-96",
-}
-
-var supportedCompressions = []string{compressionNone}
-
-// hashFuncs keeps the mapping of supported algorithms to their respective
-// hashes needed for signature verification.
-var hashFuncs = map[string]crypto.Hash{
-	KeyAlgoRSA:          crypto.SHA1,
-	KeyAlgoDSA:          crypto.SHA1,
-	KeyAlgoECDSA256:     crypto.SHA256,
-	KeyAlgoECDSA384:     crypto.SHA384,
-	KeyAlgoECDSA521:     crypto.SHA512,
-	CertAlgoRSAv01:      crypto.SHA1,
-	CertAlgoDSAv01:      crypto.SHA1,
-	CertAlgoECDSA256v01: crypto.SHA256,
-	CertAlgoECDSA384v01: crypto.SHA384,
-	CertAlgoECDSA521v01: crypto.SHA512,
-}
-
-// unexpectedMessageError results when the SSH message that we received didn't
-// match what we wanted.
-func unexpectedMessageError(expected, got uint8) error {
-	return fmt.Errorf("ssh: unexpected message type %d (expected %d)", got, expected)
-}
-
-// parseError results from a malformed SSH message.
-func parseError(tag uint8) error {
-	return fmt.Errorf("ssh: parse error in message type %d", tag)
-}
-
-func findCommon(what string, client []string, server []string) (common string, err error) {
-	for _, c := range client {
-		for _, s := range server {
-			if c == s {
-				return c, nil
-			}
-		}
-	}
-	return "", fmt.Errorf("ssh: no common algorithm for %s; client offered: %v, server offered: %v", what, client, server)
-}
-
-type directionAlgorithms struct {
-	Cipher      string
-	MAC         string
-	Compression string
-}
-
-// rekeyBytes returns a rekeying intervals in bytes.
-func (a *directionAlgorithms) rekeyBytes() int64 {
-	// According to RFC4344 block ciphers should rekey after
-	// 2^(BLOCKSIZE/4) blocks. For all AES flavors BLOCKSIZE is
-	// 128.
-	switch a.Cipher {
-	case "aes128-ctr", "aes192-ctr", "aes256-ctr", gcmCipherID, aes128cbcID:
-		return 16 * (1 << 32)
-
-	}
-
-	// For others, stick with RFC4253 recommendation to rekey after 1 Gb of data.
-	return 1 << 30
-}
-
-type algorithms struct {
-	kex     string
-	hostKey string
-	w       directionAlgorithms
-	r       directionAlgorithms
-}
-
-func findAgreedAlgorithms(clientKexInit, serverKexInit *kexInitMsg) (algs *algorithms, err error) {
-	result := &algorithms{}
-
-	result.kex, err = findCommon("key exchange", clientKexInit.KexAlgos, serverKexInit.KexAlgos)
-	if err != nil {
-		return
-	}
-
-	result.hostKey, err = findCommon("host key", clientKexInit.ServerHostKeyAlgos, serverKexInit.ServerHostKeyAlgos)
-	if err != nil {
-		return
-	}
-
-	result.w.Cipher, err = findCommon("client to server cipher", clientKexInit.CiphersClientServer, serverKexInit.CiphersClientServer)
-	if err != nil {
-		return
-	}
-
-	result.r.Cipher, err = findCommon("server to client cipher", clientKexInit.CiphersServerClient, serverKexInit.CiphersServerClient)
-	if err != nil {
-		return
-	}
-
-	result.w.MAC, err = findCommon("client to server MAC", clientKexInit.MACsClientServer, serverKexInit.MACsClientServer)
-	if err != nil {
-		return
-	}
-
-	result.r.MAC, err = findCommon("server to client MAC", clientKexInit.MACsServerClient, serverKexInit.MACsServerClient)
-	if err != nil {
-		return
-	}
-
-	result.w.Compression, err = findCommon("client to server compression", clientKexInit.CompressionClientServer, serverKexInit.CompressionClientServer)
-	if err != nil {
-		return
-	}
-
-	result.r.Compression, err = findCommon("server to client compression", clientKexInit.CompressionServerClient, serverKexInit.CompressionServerClient)
-	if err != nil {
-		return
-	}
-
-	return result, nil
-}
-
-// If rekeythreshold is too small, we can't make any progress sending
-// stuff.
-const minRekeyThreshold uint64 = 256
-
-// Config contains configuration data common to both ServerConfig and
-// ClientConfig.
-type Config struct {
-	// Rand provides the source of entropy for cryptographic
-	// primitives. If Rand is nil, the cryptographic random reader
-	// in package crypto/rand will be used.
-	Rand io.Reader
-
-	// The maximum number of bytes sent or received after which a
-	// new key is negotiated. It must be at least 256. If
-	// unspecified, a size suitable for the chosen cipher is used.
-	RekeyThreshold uint64
-
-	// The allowed key exchanges algorithms. If unspecified then a
-	// default set of algorithms is used.
-	KeyExchanges []string
-
-	// The allowed cipher algorithms. If unspecified then a sensible
-	// default is used.
-	Ciphers []string
-
-	// The allowed MAC algorithms. If unspecified then a sensible default
-	// is used.
-	MACs []string
-}
-
-// SetDefaults sets sensible values for unset fields in config. This is
-// exported for testing: Configs passed to SSH functions are copied and have
-// default values set automatically.
-func (c *Config) SetDefaults() {
-	if c.Rand == nil {
-		c.Rand = rand.Reader
-	}
-	if c.Ciphers == nil {
-		c.Ciphers = supportedCiphers
-	}
-	var ciphers []string
-	for _, c := range c.Ciphers {
-		if cipherModes[c] != nil {
-			// reject the cipher if we have no cipherModes definition
-			ciphers = append(ciphers, c)
-		}
-	}
-	c.Ciphers = ciphers
-
-	if c.KeyExchanges == nil {
-		c.KeyExchanges = supportedKexAlgos
-	}
-
-	if c.MACs == nil {
-		c.MACs = supportedMACs
-	}
-
-	if c.RekeyThreshold == 0 {
-		// cipher specific default
-	} else if c.RekeyThreshold < minRekeyThreshold {
-		c.RekeyThreshold = minRekeyThreshold
-	} else if c.RekeyThreshold >= math.MaxInt64 {
-		// Avoid weirdness if somebody uses -1 as a threshold.
-		c.RekeyThreshold = math.MaxInt64
-	}
-}
-
-// buildDataSignedForAuth returns the data that is signed in order to prove
-// possession of a private key. See RFC 4252, section 7.
-func buildDataSignedForAuth(sessionId []byte, req userAuthRequestMsg, algo, pubKey []byte) []byte {
-	data := struct {
-		Session []byte
-		Type    byte
-		User    string
-		Service string
-		Method  string
-		Sign    bool
-		Algo    []byte
-		PubKey  []byte
-	}{
-		sessionId,
-		msgUserAuthRequest,
-		req.User,
-		req.Service,
-		req.Method,
-		true,
-		algo,
-		pubKey,
-	}
-	return Marshal(data)
-}
-
-func appendU16(buf []byte, n uint16) []byte {
-	return append(buf, byte(n>>8), byte(n))
-}
-
-func appendU32(buf []byte, n uint32) []byte {
-	return append(buf, byte(n>>24), byte(n>>16), byte(n>>8), byte(n))
-}
-
-func appendU64(buf []byte, n uint64) []byte {
-	return append(buf,
-		byte(n>>56), byte(n>>48), byte(n>>40), byte(n>>32),
-		byte(n>>24), byte(n>>16), byte(n>>8), byte(n))
-}
-
-func appendInt(buf []byte, n int) []byte {
-	return appendU32(buf, uint32(n))
-}
-
-func appendString(buf []byte, s string) []byte {
-	buf = appendU32(buf, uint32(len(s)))
-	buf = append(buf, s...)
-	return buf
-}
-
-func appendBool(buf []byte, b bool) []byte {
-	if b {
-		return append(buf, 1)
-	}
-	return append(buf, 0)
-}
-
-// newCond is a helper to hide the fact that there is no usable zero
-// value for sync.Cond.
-func newCond() *sync.Cond { return sync.NewCond(new(sync.Mutex)) }
-
-// window represents the buffer available to clients
-// wishing to write to a channel.
-type window struct {
-	*sync.Cond
-	win          uint32 // RFC 4254 5.2 says the window size can grow to 2^32-1
-	writeWaiters int
-	closed       bool
-}
-
-// add adds win to the amount of window available
-// for consumers.
-func (w *window) add(win uint32) bool {
-	// a zero sized window adjust is a noop.
-	if win == 0 {
-		return true
-	}
-	w.L.Lock()
-	if w.win+win < win {
-		w.L.Unlock()
-		return false
-	}
-	w.win += win
-	// It is unusual that multiple goroutines would be attempting to reserve
-	// window space, but not guaranteed. Use broadcast to notify all waiters
-	// that additional window is available.
-	w.Broadcast()
-	w.L.Unlock()
-	return true
-}
-
-// close sets the window to closed, so all reservations fail
-// immediately.
-func (w *window) close() {
-	w.L.Lock()
-	w.closed = true
-	w.Broadcast()
-	w.L.Unlock()
-}
-
-// reserve reserves win from the available window capacity.
-// If no capacity remains, reserve will block. reserve may
-// return less than requested.
-func (w *window) reserve(win uint32) (uint32, error) {
-	var err error
-	w.L.Lock()
-	w.writeWaiters++
-	w.Broadcast()
-	for w.win == 0 && !w.closed {
-		w.Wait()
-	}
-	w.writeWaiters--
-	if w.win < win {
-		win = w.win
-	}
-	w.win -= win
-	if w.closed {
-		err = io.EOF
-	}
-	w.L.Unlock()
-	return win, err
-}
-
-// waitWriterBlocked waits until some goroutine is blocked for further
-// writes. It is used in tests only.
-func (w *window) waitWriterBlocked() {
-	w.Cond.L.Lock()
-	for w.writeWaiters == 0 {
-		w.Cond.Wait()
-	}
-	w.Cond.L.Unlock()
-}

vendor/golang.org/x/crypto/ssh/connection.go

@@ -1,143 +0,0 @@
-// Copyright 2013 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package ssh
-
-import (
-	"fmt"
-	"net"
-)
-
-// OpenChannelError is returned if the other side rejects an
-// OpenChannel request.
-type OpenChannelError struct {
-	Reason  RejectionReason
-	Message string
-}
-
-func (e *OpenChannelError) Error() string {
-	return fmt.Sprintf("ssh: rejected: %s (%s)", e.Reason, e.Message)
-}
-
-// ConnMetadata holds metadata for the connection.
-type ConnMetadata interface {
-	// User returns the user ID for this connection.
-	User() string
-
-	// SessionID returns the session hash, also denoted by H.
-	SessionID() []byte
-
-	// ClientVersion returns the client's version string as hashed
-	// into the session ID.
-	ClientVersion() []byte
-
-	// ServerVersion returns the server's version string as hashed
-	// into the session ID.
-	ServerVersion() []byte
-
-	// RemoteAddr returns the remote address for this connection.
-	RemoteAddr() net.Addr
-
-	// LocalAddr returns the local address for this connection.
-	LocalAddr() net.Addr
-}
-
-// Conn represents an SSH connection for both server and client roles.
-// Conn is the basis for implementing an application layer, such
-// as ClientConn, which implements the traditional shell access for
-// clients.
-type Conn interface {
-	ConnMetadata
-
-	// SendRequest sends a global request, and returns the
-	// reply. If wantReply is true, it returns the response status
-	// and payload. See also RFC4254, section 4.
-	SendRequest(name string, wantReply bool, payload []byte) (bool, []byte, error)
-
-	// OpenChannel tries to open an channel. If the request is
-	// rejected, it returns *OpenChannelError. On success it returns
-	// the SSH Channel and a Go channel for incoming, out-of-band
-	// requests. The Go channel must be serviced, or the
-	// connection will hang.
-	OpenChannel(name string, data []byte) (Channel, <-chan *Request, error)
-
-	// Close closes the underlying network connection
-	Close() error
-
-	// Wait blocks until the connection has shut down, and returns the
-	// error causing the shutdown.
-	Wait() error
-
-	// TODO(hanwen): consider exposing:
-	//   RequestKeyChange
-	//   Disconnect
-}
-
-// DiscardRequests consumes and rejects all requests from the
-// passed-in channel.
-func DiscardRequests(in <-chan *Request) {
-	for req := range in {
-		if req.WantReply {
-			req.Reply(false, nil)
-		}
-	}
-}
-
-// A connection represents an incoming connection.
-type connection struct {
-	transport *handshakeTransport
-	sshConn
-
-	// The connection protocol.
-	*mux
-}
-
-func (c *connection) Close() error {
-	return c.sshConn.conn.Close()
-}
-
-// sshconn provides net.Conn metadata, but disallows direct reads and
-// writes.
-type sshConn struct {
-	conn net.Conn
-
-	user          string
-	sessionID     []byte
-	clientVersion []byte
-	serverVersion []byte
-}
-
-func dup(src []byte) []byte {
-	dst := make([]byte, len(src))
-	copy(dst, src)
-	return dst
-}
-
-func (c *sshConn) User() string {
-	return c.user
-}
-
-func (c *sshConn) RemoteAddr() net.Addr {
-	return c.conn.RemoteAddr()
-}
-
-func (c *sshConn) Close() error {
-	return c.conn.Close()
-}
-
-func (c *sshConn) LocalAddr() net.Addr {
-	return c.conn.LocalAddr()
-}
-
-func (c *sshConn) SessionID() []byte {
-	return dup(c.sessionID)
-}
-
-func (c *sshConn) ClientVersion() []byte {
-	return dup(c.clientVersion)
-}
-
-func (c *sshConn) ServerVersion() []byte {
-	return dup(c.serverVersion)
-}

vendor/golang.org/x/crypto/ssh/doc.go

@@ -1,21 +0,0 @@
-// Copyright 2011 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-/*
-Package ssh implements an SSH client and server.
-
-SSH is a transport security protocol, an authentication protocol and a
-family of application protocols. The most typical application level
-protocol is a remote shell and this is specifically implemented.  However,
-the multiplexed nature of SSH is exposed to users that wish to support
-others.
-
-References:
-  [PROTOCOL.certkeys]: http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/PROTOCOL.certkeys?rev=HEAD
-  [SSH-PARAMETERS]:    http://www.iana.org/assignments/ssh-parameters/ssh-parameters.xml#ssh-parameters-1
-
-This package does not fall under the stability promise of the Go language itself,
-so its API may be changed when pressing needs arise.
-*/
-package ssh // import "golang.org/x/crypto/ssh"

vendor/golang.org/x/crypto/ssh/handshake.go

@@ -1,640 +0,0 @@
-// Copyright 2013 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package ssh
-
-import (
-	"crypto/rand"
-	"errors"
-	"fmt"
-	"io"
-	"log"
-	"net"
-	"sync"
-)
-
-// debugHandshake, if set, prints messages sent and received.  Key
-// exchange messages are printed as if DH were used, so the debug
-// messages are wrong when using ECDH.
-const debugHandshake = false
-
-// chanSize sets the amount of buffering SSH connections. This is
-// primarily for testing: setting chanSize=0 uncovers deadlocks more
-// quickly.
-const chanSize = 16
-
-// keyingTransport is a packet based transport that supports key
-// changes. It need not be thread-safe. It should pass through
-// msgNewKeys in both directions.
-type keyingTransport interface {
-	packetConn
-
-	// prepareKeyChange sets up a key change. The key change for a
-	// direction will be effected if a msgNewKeys message is sent
-	// or received.
-	prepareKeyChange(*algorithms, *kexResult) error
-}
-
-// handshakeTransport implements rekeying on top of a keyingTransport
-// and offers a thread-safe writePacket() interface.
-type handshakeTransport struct {
-	conn   keyingTransport
-	config *Config
-
-	serverVersion []byte
-	clientVersion []byte
-
-	// hostKeys is non-empty if we are the server. In that case,
-	// it contains all host keys that can be used to sign the
-	// connection.
-	hostKeys []Signer
-
-	// hostKeyAlgorithms is non-empty if we are the client. In that case,
-	// we accept these key types from the server as host key.
-	hostKeyAlgorithms []string
-
-	// On read error, incoming is closed, and readError is set.
-	incoming  chan []byte
-	readError error
-
-	mu             sync.Mutex
-	writeError     error
-	sentInitPacket []byte
-	sentInitMsg    *kexInitMsg
-	pendingPackets [][]byte // Used when a key exchange is in progress.
-
-	// If the read loop wants to schedule a kex, it pings this
-	// channel, and the write loop will send out a kex
-	// message.
-	requestKex chan struct{}
-
-	// If the other side requests or confirms a kex, its kexInit
-	// packet is sent here for the write loop to find it.
-	startKex chan *pendingKex
-
-	// data for host key checking
-	hostKeyCallback HostKeyCallback
-	dialAddress     string
-	remoteAddr      net.Addr
-
-	// Algorithms agreed in the last key exchange.
-	algorithms *algorithms
-
-	readPacketsLeft uint32
-	readBytesLeft   int64
-
-	writePacketsLeft uint32
-	writeBytesLeft   int64
-
-	// The session ID or nil if first kex did not complete yet.
-	sessionID []byte
-}
-
-type pendingKex struct {
-	otherInit []byte
-	done      chan error
-}
-
-func newHandshakeTransport(conn keyingTransport, config *Config, clientVersion, serverVersion []byte) *handshakeTransport {
-	t := &handshakeTransport{
-		conn:          conn,
-		serverVersion: serverVersion,
-		clientVersion: clientVersion,
-		incoming:      make(chan []byte, chanSize),
-		requestKex:    make(chan struct{}, 1),
-		startKex:      make(chan *pendingKex, 1),
-
-		config: config,
-	}
-	t.resetReadThresholds()
-	t.resetWriteThresholds()
-
-	// We always start with a mandatory key exchange.
-	t.requestKex <- struct{}{}
-	return t
-}
-
-func newClientTransport(conn keyingTransport, clientVersion, serverVersion []byte, config *ClientConfig, dialAddr string, addr net.Addr) *handshakeTransport {
-	t := newHandshakeTransport(conn, &config.Config, clientVersion, serverVersion)
-	t.dialAddress = dialAddr
-	t.remoteAddr = addr
-	t.hostKeyCallback = config.HostKeyCallback
-	if config.HostKeyAlgorithms != nil {
-		t.hostKeyAlgorithms = config.HostKeyAlgorithms
-	} else {
-		t.hostKeyAlgorithms = supportedHostKeyAlgos
-	}
-	go t.readLoop()
-	go t.kexLoop()
-	return t
-}
-
-func newServerTransport(conn keyingTransport, clientVersion, serverVersion []byte, config *ServerConfig) *handshakeTransport {
-	t := newHandshakeTransport(conn, &config.Config, clientVersion, serverVersion)
-	t.hostKeys = config.hostKeys
-	go t.readLoop()
-	go t.kexLoop()
-	return t
-}
-
-func (t *handshakeTransport) getSessionID() []byte {
-	return t.sessionID
-}
-
-// waitSession waits for the session to be established. This should be
-// the first thing to call after instantiating handshakeTransport.
-func (t *handshakeTransport) waitSession() error {
-	p, err := t.readPacket()
-	if err != nil {
-		return err
-	}
-	if p[0] != msgNewKeys {
-		return fmt.Errorf("ssh: first packet should be msgNewKeys")
-	}
-
-	return nil
-}
-
-func (t *handshakeTransport) id() string {
-	if len(t.hostKeys) > 0 {
-		return "server"
-	}
-	return "client"
-}
-
-func (t *handshakeTransport) printPacket(p []byte, write bool) {
-	action := "got"
-	if write {
-		action = "sent"
-	}
-
-	if p[0] == msgChannelData || p[0] == msgChannelExtendedData {
-		log.Printf("%s %s data (packet %d bytes)", t.id(), action, len(p))
-	} else {
-		msg, err := decode(p)
-		log.Printf("%s %s %T %v (%v)", t.id(), action, msg, msg, err)
-	}
-}
-
-func (t *handshakeTransport) readPacket() ([]byte, error) {
-	p, ok := <-t.incoming
-	if !ok {
-		return nil, t.readError
-	}
-	return p, nil
-}
-
-func (t *handshakeTransport) readLoop() {
-	first := true
-	for {
-		p, err := t.readOnePacket(first)
-		first = false
-		if err != nil {
-			t.readError = err
-			close(t.incoming)
-			break
-		}
-		if p[0] == msgIgnore || p[0] == msgDebug {
-			continue
-		}
-		t.incoming <- p
-	}
-
-	// Stop writers too.
-	t.recordWriteError(t.readError)
-
-	// Unblock the writer should it wait for this.
-	close(t.startKex)
-
-	// Don't close t.requestKex; it's also written to from writePacket.
-}
-
-func (t *handshakeTransport) pushPacket(p []byte) error {
-	if debugHandshake {
-		t.printPacket(p, true)
-	}
-	return t.conn.writePacket(p)
-}
-
-func (t *handshakeTransport) getWriteError() error {
-	t.mu.Lock()
-	defer t.mu.Unlock()
-	return t.writeError
-}
-
-func (t *handshakeTransport) recordWriteError(err error) {
-	t.mu.Lock()
-	defer t.mu.Unlock()
-	if t.writeError == nil && err != nil {
-		t.writeError = err
-	}
-}
-
-func (t *handshakeTransport) requestKeyExchange() {
-	select {
-	case t.requestKex <- struct{}{}:
-	default:
-		// something already requested a kex, so do nothing.
-	}
-}
-
-func (t *handshakeTransport) resetWriteThresholds() {
-	t.writePacketsLeft = packetRekeyThreshold
-	if t.config.RekeyThreshold > 0 {
-		t.writeBytesLeft = int64(t.config.RekeyThreshold)
-	} else if t.algorithms != nil {
-		t.writeBytesLeft = t.algorithms.w.rekeyBytes()
-	} else {
-		t.writeBytesLeft = 1 << 30
-	}
-}
-
-func (t *handshakeTransport) kexLoop() {
-
-write:
-	for t.getWriteError() == nil {
-		var request *pendingKex
-		var sent bool
-
-		for request == nil || !sent {
-			var ok bool
-			select {
-			case request, ok = <-t.startKex:
-				if !ok {
-					break write
-				}
-			case <-t.requestKex:
-				break
-			}
-
-			if !sent {
-				if err := t.sendKexInit(); err != nil {
-					t.recordWriteError(err)
-					break
-				}
-				sent = true
-			}
-		}
-
-		if err := t.getWriteError(); err != nil {
-			if request != nil {
-				request.done <- err
-			}
-			break
-		}
-
-		// We're not servicing t.requestKex, but that is OK:
-		// we never block on sending to t.requestKex.
-
-		// We're not servicing t.startKex, but the remote end
-		// has just sent us a kexInitMsg, so it can't send
-		// another key change request, until we close the done
-		// channel on the pendingKex request.
-
-		err := t.enterKeyExchange(request.otherInit)
-
-		t.mu.Lock()
-		t.writeError = err
-		t.sentInitPacket = nil
-		t.sentInitMsg = nil
-
-		t.resetWriteThresholds()
-
-		// we have completed the key exchange. Since the
-		// reader is still blocked, it is safe to clear out
-		// the requestKex channel. This avoids the situation
-		// where: 1) we consumed our own request for the
-		// initial kex, and 2) the kex from the remote side
-		// caused another send on the requestKex channel,
-	clear:
-		for {
-			select {
-			case <-t.requestKex:
-				//
-			default:
-				break clear
-			}
-		}
-
-		request.done <- t.writeError
-
-		// kex finished. Push packets that we received while
-		// the kex was in progress. Don't look at t.startKex
-		// and don't increment writtenSinceKex: if we trigger
-		// another kex while we are still busy with the last
-		// one, things will become very confusing.
-		for _, p := range t.pendingPackets {
-			t.writeError = t.pushPacket(p)
-			if t.writeError != nil {
-				break
-			}
-		}
-		t.pendingPackets = t.pendingPackets[:0]
-		t.mu.Unlock()
-	}
-
-	// drain startKex channel. We don't service t.requestKex
-	// because nobody does blocking sends there.
-	go func() {
-		for init := range t.startKex {
-			init.done <- t.writeError
-		}
-	}()
-
-	// Unblock reader.
-	t.conn.Close()
-}
-
-// The protocol uses uint32 for packet counters, so we can't let them
-// reach 1<<32.  We will actually read and write more packets than
-// this, though: the other side may send more packets, and after we
-// hit this limit on writing we will send a few more packets for the
-// key exchange itself.
-const packetRekeyThreshold = (1 << 31)
-
-func (t *handshakeTransport) resetReadThresholds() {
-	t.readPacketsLeft = packetRekeyThreshold
-	if t.config.RekeyThreshold > 0 {
-		t.readBytesLeft = int64(t.config.RekeyThreshold)
-	} else if t.algorithms != nil {
-		t.readBytesLeft = t.algorithms.r.rekeyBytes()
-	} else {
-		t.readBytesLeft = 1 << 30
-	}
-}
-
-func (t *handshakeTransport) readOnePacket(first bool) ([]byte, error) {
-	p, err := t.conn.readPacket()
-	if err != nil {
-		return nil, err
-	}
-
-	if t.readPacketsLeft > 0 {
-		t.readPacketsLeft--
-	} else {
-		t.requestKeyExchange()
-	}
-
-	if t.readBytesLeft > 0 {
-		t.readBytesLeft -= int64(len(p))
-	} else {
-		t.requestKeyExchange()
-	}
-
-	if debugHandshake {
-		t.printPacket(p, false)
-	}
-
-	if first && p[0] != msgKexInit {
-		return nil, fmt.Errorf("ssh: first packet should be msgKexInit")
-	}
-
-	if p[0] != msgKexInit {
-		return p, nil
-	}
-
-	firstKex := t.sessionID == nil
-
-	kex := pendingKex{
-		done:      make(chan error, 1),
-		otherInit: p,
-	}
-	t.startKex <- &kex
-	err = <-kex.done
-
-	if debugHandshake {
-		log.Printf("%s exited key exchange (first %v), err %v", t.id(), firstKex, err)
-	}
-
-	if err != nil {
-		return nil, err
-	}
-
-	t.resetReadThresholds()
-
-	// By default, a key exchange is hidden from higher layers by
-	// translating it into msgIgnore.
-	successPacket := []byte{msgIgnore}
-	if firstKex {
-		// sendKexInit() for the first kex waits for
-		// msgNewKeys so the authentication process is
-		// guaranteed to happen over an encrypted transport.
-		successPacket = []byte{msgNewKeys}
-	}
-
-	return successPacket, nil
-}
-
-// sendKexInit sends a key change message.
-func (t *handshakeTransport) sendKexInit() error {
-	t.mu.Lock()
-	defer t.mu.Unlock()
-	if t.sentInitMsg != nil {
-		// kexInits may be sent either in response to the other side,
-		// or because our side wants to initiate a key change, so we
-		// may have already sent a kexInit. In that case, don't send a
-		// second kexInit.
-		return nil
-	}
-
-	msg := &kexInitMsg{
-		KexAlgos:                t.config.KeyExchanges,
-		CiphersClientServer:     t.config.Ciphers,
-		CiphersServerClient:     t.config.Ciphers,
-		MACsClientServer:        t.config.MACs,
-		MACsServerClient:        t.config.MACs,
-		CompressionClientServer: supportedCompressions,
-		CompressionServerClient: supportedCompressions,
-	}
-	io.ReadFull(rand.Reader, msg.Cookie[:])
-
-	if len(t.hostKeys) > 0 {
-		for _, k := range t.hostKeys {
-			msg.ServerHostKeyAlgos = append(
-				msg.ServerHostKeyAlgos, k.PublicKey().Type())
-		}
-	} else {
-		msg.ServerHostKeyAlgos = t.hostKeyAlgorithms
-	}
-	packet := Marshal(msg)
-
-	// writePacket destroys the contents, so save a copy.
-	packetCopy := make([]byte, len(packet))
-	copy(packetCopy, packet)
-
-	if err := t.pushPacket(packetCopy); err != nil {
-		return err
-	}
-
-	t.sentInitMsg = msg
-	t.sentInitPacket = packet
-
-	return nil
-}
-
-func (t *handshakeTransport) writePacket(p []byte) error {
-	switch p[0] {
-	case msgKexInit:
-		return errors.New("ssh: only handshakeTransport can send kexInit")
-	case msgNewKeys:
-		return errors.New("ssh: only handshakeTransport can send newKeys")
-	}
-
-	t.mu.Lock()
-	defer t.mu.Unlock()
-	if t.writeError != nil {
-		return t.writeError
-	}
-
-	if t.sentInitMsg != nil {
-		// Copy the packet so the writer can reuse the buffer.
-		cp := make([]byte, len(p))
-		copy(cp, p)
-		t.pendingPackets = append(t.pendingPackets, cp)
-		return nil
-	}
-
-	if t.writeBytesLeft > 0 {
-		t.writeBytesLeft -= int64(len(p))
-	} else {
-		t.requestKeyExchange()
-	}
-
-	if t.writePacketsLeft > 0 {
-		t.writePacketsLeft--
-	} else {
-		t.requestKeyExchange()
-	}
-
-	if err := t.pushPacket(p); err != nil {
-		t.writeError = err
-	}
-
-	return nil
-}
-
-func (t *handshakeTransport) Close() error {
-	return t.conn.Close()
-}
-
-func (t *handshakeTransport) enterKeyExchange(otherInitPacket []byte) error {
-	if debugHandshake {
-		log.Printf("%s entered key exchange", t.id())
-	}
-
-	otherInit := &kexInitMsg{}
-	if err := Unmarshal(otherInitPacket, otherInit); err != nil {
-		return err
-	}
-
-	magics := handshakeMagics{
-		clientVersion: t.clientVersion,
-		serverVersion: t.serverVersion,
-		clientKexInit: otherInitPacket,
-		serverKexInit: t.sentInitPacket,
-	}
-
-	clientInit := otherInit
-	serverInit := t.sentInitMsg
-	if len(t.hostKeys) == 0 {
-		clientInit, serverInit = serverInit, clientInit
-
-		magics.clientKexInit = t.sentInitPacket
-		magics.serverKexInit = otherInitPacket
-	}
-
-	var err error
-	t.algorithms, err = findAgreedAlgorithms(clientInit, serverInit)
-	if err != nil {
-		return err
-	}
-
-	// We don't send FirstKexFollows, but we handle receiving it.
-	//
-	// RFC 4253 section 7 defines the kex and the agreement method for
-	// first_kex_packet_follows. It states that the guessed packet
-	// should be ignored if the "kex algorithm and/or the host
-	// key algorithm is guessed wrong (server and client have
-	// different preferred algorithm), or if any of the other
-	// algorithms cannot be agreed upon". The other algorithms have
-	// already been checked above so the kex algorithm and host key
-	// algorithm are checked here.
-	if otherInit.FirstKexFollows && (clientInit.KexAlgos[0] != serverInit.KexAlgos[0] || clientInit.ServerHostKeyAlgos[0] != serverInit.ServerHostKeyAlgos[0]) {
-		// other side sent a kex message for the wrong algorithm,
-		// which we have to ignore.
-		if _, err := t.conn.readPacket(); err != nil {
-			return err
-		}
-	}
-
-	kex, ok := kexAlgoMap[t.algorithms.kex]
-	if !ok {
-		return fmt.Errorf("ssh: unexpected key exchange algorithm %v", t.algorithms.kex)
-	}
-
-	var result *kexResult
-	if len(t.hostKeys) > 0 {
-		result, err = t.server(kex, t.algorithms, &magics)
-	} else {
-		result, err = t.client(kex, t.algorithms, &magics)
-	}
-
-	if err != nil {
-		return err
-	}
-
-	if t.sessionID == nil {
-		t.sessionID = result.H
-	}
-	result.SessionID = t.sessionID
-
-	if err := t.conn.prepareKeyChange(t.algorithms, result); err != nil {
-		return err
-	}
-	if err = t.conn.writePacket([]byte{msgNewKeys}); err != nil {
-		return err
-	}
-	if packet, err := t.conn.readPacket(); err != nil {
-		return err
-	} else if packet[0] != msgNewKeys {
-		return unexpectedMessageError(msgNewKeys, packet[0])
-	}
-
-	return nil
-}
-
-func (t *handshakeTransport) server(kex kexAlgorithm, algs *algorithms, magics *handshakeMagics) (*kexResult, error) {
-	var hostKey Signer
-	for _, k := range t.hostKeys {
-		if algs.hostKey == k.PublicKey().Type() {
-			hostKey = k
-		}
-	}
-
-	r, err := kex.Server(t.conn, t.config.Rand, magics, hostKey)
-	return r, err
-}
-
-func (t *handshakeTransport) client(kex kexAlgorithm, algs *algorithms, magics *handshakeMagics) (*kexResult, error) {
-	result, err := kex.Client(t.conn, t.config.Rand, magics)
-	if err != nil {
-		return nil, err
-	}
-
-	hostKey, err := ParsePublicKey(result.HostKey)
-	if err != nil {
-		return nil, err
-	}
-
-	if err := verifyHostKeySignature(hostKey, result); err != nil {
-		return nil, err
-	}
-
-	err = t.hostKeyCallback(t.dialAddress, t.remoteAddr, hostKey)
-	if err != nil {
-		return nil, err
-	}
-
-	return result, nil
-}

vendor/golang.org/x/crypto/ssh/kex.go

@@ -1,540 +0,0 @@
-// Copyright 2013 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package ssh
-
-import (
-	"crypto"
-	"crypto/ecdsa"
-	"crypto/elliptic"
-	"crypto/rand"
-	"crypto/subtle"
-	"errors"
-	"io"
-	"math/big"
-
-	"golang.org/x/crypto/curve25519"
-)
-
-const (
-	kexAlgoDH1SHA1          = "diffie-hellman-group1-sha1"
-	kexAlgoDH14SHA1         = "diffie-hellman-group14-sha1"
-	kexAlgoECDH256          = "ecdh-sha2-nistp256"
-	kexAlgoECDH384          = "ecdh-sha2-nistp384"
-	kexAlgoECDH521          = "ecdh-sha2-nistp521"
-	kexAlgoCurve25519SHA256 = "curve25519-sha256@libssh.org"
-)
-
-// kexResult captures the outcome of a key exchange.
-type kexResult struct {
-	// Session hash. See also RFC 4253, section 8.
-	H []byte
-
-	// Shared secret. See also RFC 4253, section 8.
-	K []byte
-
-	// Host key as hashed into H.
-	HostKey []byte
-
-	// Signature of H.
-	Signature []byte
-
-	// A cryptographic hash function that matches the security
-	// level of the key exchange algorithm. It is used for
-	// calculating H, and for deriving keys from H and K.
-	Hash crypto.Hash
-
-	// The session ID, which is the first H computed. This is used
-	// to derive key material inside the transport.
-	SessionID []byte
-}
-
-// handshakeMagics contains data that is always included in the
-// session hash.
-type handshakeMagics struct {
-	clientVersion, serverVersion []byte
-	clientKexInit, serverKexInit []byte
-}
-
-func (m *handshakeMagics) write(w io.Writer) {
-	writeString(w, m.clientVersion)
-	writeString(w, m.serverVersion)
-	writeString(w, m.clientKexInit)
-	writeString(w, m.serverKexInit)
-}
-
-// kexAlgorithm abstracts different key exchange algorithms.
-type kexAlgorithm interface {
-	// Server runs server-side key agreement, signing the result
-	// with a hostkey.
-	Server(p packetConn, rand io.Reader, magics *handshakeMagics, s Signer) (*kexResult, error)
-
-	// Client runs the client-side key agreement. Caller is
-	// responsible for verifying the host key signature.
-	Client(p packetConn, rand io.Reader, magics *handshakeMagics) (*kexResult, error)
-}
-
-// dhGroup is a multiplicative group suitable for implementing Diffie-Hellman key agreement.
-type dhGroup struct {
-	g, p, pMinus1 *big.Int
-}
-
-func (group *dhGroup) diffieHellman(theirPublic, myPrivate *big.Int) (*big.Int, error) {
-	if theirPublic.Cmp(bigOne) <= 0 || theirPublic.Cmp(group.pMinus1) >= 0 {
-		return nil, errors.New("ssh: DH parameter out of bounds")
-	}
-	return new(big.Int).Exp(theirPublic, myPrivate, group.p), nil
-}
-
-func (group *dhGroup) Client(c packetConn, randSource io.Reader, magics *handshakeMagics) (*kexResult, error) {
-	hashFunc := crypto.SHA1
-
-	var x *big.Int
-	for {
-		var err error
-		if x, err = rand.Int(randSource, group.pMinus1); err != nil {
-			return nil, err
-		}
-		if x.Sign() > 0 {
-			break
-		}
-	}
-
-	X := new(big.Int).Exp(group.g, x, group.p)
-	kexDHInit := kexDHInitMsg{
-		X: X,
-	}
-	if err := c.writePacket(Marshal(&kexDHInit)); err != nil {
-		return nil, err
-	}
-
-	packet, err := c.readPacket()
-	if err != nil {
-		return nil, err
-	}
-
-	var kexDHReply kexDHReplyMsg
-	if err = Unmarshal(packet, &kexDHReply); err != nil {
-		return nil, err
-	}
-
-	kInt, err := group.diffieHellman(kexDHReply.Y, x)
-	if err != nil {
-		return nil, err
-	}
-
-	h := hashFunc.New()
-	magics.write(h)
-	writeString(h, kexDHReply.HostKey)
-	writeInt(h, X)
-	writeInt(h, kexDHReply.Y)
-	K := make([]byte, intLength(kInt))
-	marshalInt(K, kInt)
-	h.Write(K)
-
-	return &kexResult{
-		H:         h.Sum(nil),
-		K:         K,
-		HostKey:   kexDHReply.HostKey,
-		Signature: kexDHReply.Signature,
-		Hash:      crypto.SHA1,
-	}, nil
-}
-
-func (group *dhGroup) Server(c packetConn, randSource io.Reader, magics *handshakeMagics, priv Signer) (result *kexResult, err error) {
-	hashFunc := crypto.SHA1
-	packet, err := c.readPacket()
-	if err != nil {
-		return
-	}
-	var kexDHInit kexDHInitMsg
-	if err = Unmarshal(packet, &kexDHInit); err != nil {
-		return
-	}
-
-	var y *big.Int
-	for {
-		if y, err = rand.Int(randSource, group.pMinus1); err != nil {
-			return
-		}
-		if y.Sign() > 0 {
-			break
-		}
-	}
-
-	Y := new(big.Int).Exp(group.g, y, group.p)
-	kInt, err := group.diffieHellman(kexDHInit.X, y)
-	if err != nil {
-		return nil, err
-	}
-
-	hostKeyBytes := priv.PublicKey().Marshal()
-
-	h := hashFunc.New()
-	magics.write(h)
-	writeString(h, hostKeyBytes)
-	writeInt(h, kexDHInit.X)
-	writeInt(h, Y)
-
-	K := make([]byte, intLength(kInt))
-	marshalInt(K, kInt)
-	h.Write(K)
-
-	H := h.Sum(nil)
-
-	// H is already a hash, but the hostkey signing will apply its
-	// own key-specific hash algorithm.
-	sig, err := signAndMarshal(priv, randSource, H)
-	if err != nil {
-		return nil, err
-	}
-
-	kexDHReply := kexDHReplyMsg{
-		HostKey:   hostKeyBytes,
-		Y:         Y,
-		Signature: sig,
-	}
-	packet = Marshal(&kexDHReply)
-
-	err = c.writePacket(packet)
-	return &kexResult{
-		H:         H,
-		K:         K,
-		HostKey:   hostKeyBytes,
-		Signature: sig,
-		Hash:      crypto.SHA1,
-	}, nil
-}
-
-// ecdh performs Elliptic Curve Diffie-Hellman key exchange as
-// described in RFC 5656, section 4.
-type ecdh struct {
-	curve elliptic.Curve
-}
-
-func (kex *ecdh) Client(c packetConn, rand io.Reader, magics *handshakeMagics) (*kexResult, error) {
-	ephKey, err := ecdsa.GenerateKey(kex.curve, rand)
-	if err != nil {
-		return nil, err
-	}
-
-	kexInit := kexECDHInitMsg{
-		ClientPubKey: elliptic.Marshal(kex.curve, ephKey.PublicKey.X, ephKey.PublicKey.Y),
-	}
-
-	serialized := Marshal(&kexInit)
-	if err := c.writePacket(serialized); err != nil {
-		return nil, err
-	}
-
-	packet, err := c.readPacket()
-	if err != nil {
-		return nil, err
-	}
-
-	var reply kexECDHReplyMsg
-	if err = Unmarshal(packet, &reply); err != nil {
-		return nil, err
-	}
-
-	x, y, err := unmarshalECKey(kex.curve, reply.EphemeralPubKey)
-	if err != nil {
-		return nil, err
-	}
-
-	// generate shared secret
-	secret, _ := kex.curve.ScalarMult(x, y, ephKey.D.Bytes())
-
-	h := ecHash(kex.curve).New()
-	magics.write(h)
-	writeString(h, reply.HostKey)
-	writeString(h, kexInit.ClientPubKey)
-	writeString(h, reply.EphemeralPubKey)
-	K := make([]byte, intLength(secret))
-	marshalInt(K, secret)
-	h.Write(K)
-
-	return &kexResult{
-		H:         h.Sum(nil),
-		K:         K,
-		HostKey:   reply.HostKey,
-		Signature: reply.Signature,
-		Hash:      ecHash(kex.curve),
-	}, nil
-}
-
-// unmarshalECKey parses and checks an EC key.
-func unmarshalECKey(curve elliptic.Curve, pubkey []byte) (x, y *big.Int, err error) {
-	x, y = elliptic.Unmarshal(curve, pubkey)
-	if x == nil {
-		return nil, nil, errors.New("ssh: elliptic.Unmarshal failure")
-	}
-	if !validateECPublicKey(curve, x, y) {
-		return nil, nil, errors.New("ssh: public key not on curve")
-	}
-	return x, y, nil
-}
-
-// validateECPublicKey checks that the point is a valid public key for
-// the given curve. See [SEC1], 3.2.2
-func validateECPublicKey(curve elliptic.Curve, x, y *big.Int) bool {
-	if x.Sign() == 0 && y.Sign() == 0 {
-		return false
-	}
-
-	if x.Cmp(curve.Params().P) >= 0 {
-		return false
-	}
-
-	if y.Cmp(curve.Params().P) >= 0 {
-		return false
-	}
-
-	if !curve.IsOnCurve(x, y) {
-		return false
-	}
-
-	// We don't check if N * PubKey == 0, since
-	//
-	// - the NIST curves have cofactor = 1, so this is implicit.
-	// (We don't foresee an implementation that supports non NIST
-	// curves)
-	//
-	// - for ephemeral keys, we don't need to worry about small
-	// subgroup attacks.
-	return true
-}
-
-func (kex *ecdh) Server(c packetConn, rand io.Reader, magics *handshakeMagics, priv Signer) (result *kexResult, err error) {
-	packet, err := c.readPacket()
-	if err != nil {
-		return nil, err
-	}
-
-	var kexECDHInit kexECDHInitMsg
-	if err = Unmarshal(packet, &kexECDHInit); err != nil {
-		return nil, err
-	}
-
-	clientX, clientY, err := unmarshalECKey(kex.curve, kexECDHInit.ClientPubKey)
-	if err != nil {
-		return nil, err
-	}
-
-	// We could cache this key across multiple users/multiple
-	// connection attempts, but the benefit is small. OpenSSH
-	// generates a new key for each incoming connection.
-	ephKey, err := ecdsa.GenerateKey(kex.curve, rand)
-	if err != nil {
-		return nil, err
-	}
-
-	hostKeyBytes := priv.PublicKey().Marshal()
-
-	serializedEphKey := elliptic.Marshal(kex.curve, ephKey.PublicKey.X, ephKey.PublicKey.Y)
-
-	// generate shared secret
-	secret, _ := kex.curve.ScalarMult(clientX, clientY, ephKey.D.Bytes())
-
-	h := ecHash(kex.curve).New()
-	magics.write(h)
-	writeString(h, hostKeyBytes)
-	writeString(h, kexECDHInit.ClientPubKey)
-	writeString(h, serializedEphKey)
-
-	K := make([]byte, intLength(secret))
-	marshalInt(K, secret)
-	h.Write(K)
-
-	H := h.Sum(nil)
-
-	// H is already a hash, but the hostkey signing will apply its
-	// own key-specific hash algorithm.
-	sig, err := signAndMarshal(priv, rand, H)
-	if err != nil {
-		return nil, err
-	}
-
-	reply := kexECDHReplyMsg{
-		EphemeralPubKey: serializedEphKey,
-		HostKey:         hostKeyBytes,
-		Signature:       sig,
-	}
-
-	serialized := Marshal(&reply)
-	if err := c.writePacket(serialized); err != nil {
-		return nil, err
-	}
-
-	return &kexResult{
-		H:         H,
-		K:         K,
-		HostKey:   reply.HostKey,
-		Signature: sig,
-		Hash:      ecHash(kex.curve),
-	}, nil
-}
-
-var kexAlgoMap = map[string]kexAlgorithm{}
-
-func init() {
-	// This is the group called diffie-hellman-group1-sha1 in RFC
-	// 4253 and Oakley Group 2 in RFC 2409.
-	p, _ := new(big.Int).SetString("FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD129024E088A67CC74020BBEA63B139B22514A08798E3404DDEF9519B3CD3A431B302B0A6DF25F14374FE1356D6D51C245E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7EDEE386BFB5A899FA5AE9F24117C4B1FE649286651ECE65381FFFFFFFFFFFFFFFF", 16)
-	kexAlgoMap[kexAlgoDH1SHA1] = &dhGroup{
-		g:       new(big.Int).SetInt64(2),
-		p:       p,
-		pMinus1: new(big.Int).Sub(p, bigOne),
-	}
-
-	// This is the group called diffie-hellman-group14-sha1 in RFC
-	// 4253 and Oakley Group 14 in RFC 3526.
-	p, _ = new(big.Int).SetString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
-
-	kexAlgoMap[kexAlgoDH14SHA1] = &dhGroup{
-		g:       new(big.Int).SetInt64(2),
-		p:       p,
-		pMinus1: new(big.Int).Sub(p, bigOne),
-	}
-
-	kexAlgoMap[kexAlgoECDH521] = &ecdh{elliptic.P521()}
-	kexAlgoMap[kexAlgoECDH384] = &ecdh{elliptic.P384()}
-	kexAlgoMap[kexAlgoECDH256] = &ecdh{elliptic.P256()}
-	kexAlgoMap[kexAlgoCurve25519SHA256] = &curve25519sha256{}
-}
-
-// curve25519sha256 implements the curve25519-sha256@libssh.org key
-// agreement protocol, as described in
-// https://git.libssh.org/projects/libssh.git/tree/doc/curve25519-sha256@libssh.org.txt
-type curve25519sha256 struct{}
-
-type curve25519KeyPair struct {
-	priv [32]byte
-	pub  [32]byte
-}
-
-func (kp *curve25519KeyPair) generate(rand io.Reader) error {
-	if _, err := io.ReadFull(rand, kp.priv[:]); err != nil {
-		return err
-	}
-	curve25519.ScalarBaseMult(&kp.pub, &kp.priv)
-	return nil
-}
-
-// curve25519Zeros is just an array of 32 zero bytes so that we have something
-// convenient to compare against in order to reject curve25519 points with the
-// wrong order.
-var curve25519Zeros [32]byte
-
-func (kex *curve25519sha256) Client(c packetConn, rand io.Reader, magics *handshakeMagics) (*kexResult, error) {
-	var kp curve25519KeyPair
-	if err := kp.generate(rand); err != nil {
-		return nil, err
-	}
-	if err := c.writePacket(Marshal(&kexECDHInitMsg{kp.pub[:]})); err != nil {
-		return nil, err
-	}
-
-	packet, err := c.readPacket()
-	if err != nil {
-		return nil, err
-	}
-
-	var reply kexECDHReplyMsg
-	if err = Unmarshal(packet, &reply); err != nil {
-		return nil, err
-	}
-	if len(reply.EphemeralPubKey) != 32 {
-		return nil, errors.New("ssh: peer's curve25519 public value has wrong length")
-	}
-
-	var servPub, secret [32]byte
-	copy(servPub[:], reply.EphemeralPubKey)
-	curve25519.ScalarMult(&secret, &kp.priv, &servPub)
-	if subtle.ConstantTimeCompare(secret[:], curve25519Zeros[:]) == 1 {
-		return nil, errors.New("ssh: peer's curve25519 public value has wrong order")
-	}
-
-	h := crypto.SHA256.New()
-	magics.write(h)
-	writeString(h, reply.HostKey)
-	writeString(h, kp.pub[:])
-	writeString(h, reply.EphemeralPubKey)
-
-	kInt := new(big.Int).SetBytes(secret[:])
-	K := make([]byte, intLength(kInt))
-	marshalInt(K, kInt)
-	h.Write(K)
-
-	return &kexResult{
-		H:         h.Sum(nil),
-		K:         K,
-		HostKey:   reply.HostKey,
-		Signature: reply.Signature,
-		Hash:      crypto.SHA256,
-	}, nil
-}
-
-func (kex *curve25519sha256) Server(c packetConn, rand io.Reader, magics *handshakeMagics, priv Signer) (result *kexResult, err error) {
-	packet, err := c.readPacket()
-	if err != nil {
-		return
-	}
-	var kexInit kexECDHInitMsg
-	if err = Unmarshal(packet, &kexInit); err != nil {
-		return
-	}
-
-	if len(kexInit.ClientPubKey) != 32 {
-		return nil, errors.New("ssh: peer's curve25519 public value has wrong length")
-	}
-
-	var kp curve25519KeyPair
-	if err := kp.generate(rand); err != nil {
-		return nil, err
-	}
-
-	var clientPub, secret [32]byte
-	copy(clientPub[:], kexInit.ClientPubKey)
-	curve25519.ScalarMult(&secret, &kp.priv, &clientPub)
-	if subtle.ConstantTimeCompare(secret[:], curve25519Zeros[:]) == 1 {
-		return nil, errors.New("ssh: peer's curve25519 public value has wrong order")
-	}
-
-	hostKeyBytes := priv.PublicKey().Marshal()
-
-	h := crypto.SHA256.New()
-	magics.write(h)
-	writeString(h, hostKeyBytes)
-	writeString(h, kexInit.ClientPubKey)
-	writeString(h, kp.pub[:])
-
-	kInt := new(big.Int).SetBytes(secret[:])
-	K := make([]byte, intLength(kInt))
-	marshalInt(K, kInt)
-	h.Write(K)
-
-	H := h.Sum(nil)
-
-	sig, err := signAndMarshal(priv, rand, H)
-	if err != nil {
-		return nil, err
-	}
-
-	reply := kexECDHReplyMsg{
-		EphemeralPubKey: kp.pub[:],
-		HostKey:         hostKeyBytes,
-		Signature:       sig,
-	}
-	if err := c.writePacket(Marshal(&reply)); err != nil {
-		return nil, err
-	}
-	return &kexResult{
-		H:         H,
-		K:         K,
-		HostKey:   hostKeyBytes,
-		Signature: sig,
-		Hash:      crypto.SHA256,
-	}, nil
-}

vendor/golang.org/x/crypto/ssh/keys.go

@@ -1,1031 +0,0 @@
-// Copyright 2012 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package ssh
-
-import (
-	"bytes"
-	"crypto"
-	"crypto/dsa"
-	"crypto/ecdsa"
-	"crypto/elliptic"
-	"crypto/md5"
-	"crypto/rsa"
-	"crypto/sha256"
-	"crypto/x509"
-	"encoding/asn1"
-	"encoding/base64"
-	"encoding/hex"
-	"encoding/pem"
-	"errors"
-	"fmt"
-	"io"
-	"math/big"
-	"strings"
-
-	"golang.org/x/crypto/ed25519"
-)
-
-// These constants represent the algorithm names for key types supported by this
-// package.
-const (
-	KeyAlgoRSA      = "ssh-rsa"
-	KeyAlgoDSA      = "ssh-dss"
-	KeyAlgoECDSA256 = "ecdsa-sha2-nistp256"
-	KeyAlgoECDSA384 = "ecdsa-sha2-nistp384"
-	KeyAlgoECDSA521 = "ecdsa-sha2-nistp521"
-	KeyAlgoED25519  = "ssh-ed25519"
-)
-
-// parsePubKey parses a public key of the given algorithm.
-// Use ParsePublicKey for keys with prepended algorithm.
-func parsePubKey(in []byte, algo string) (pubKey PublicKey, rest []byte, err error) {
-	switch algo {
-	case KeyAlgoRSA:
-		return parseRSA(in)
-	case KeyAlgoDSA:
-		return parseDSA(in)
-	case KeyAlgoECDSA256, KeyAlgoECDSA384, KeyAlgoECDSA521:
-		return parseECDSA(in)
-	case KeyAlgoED25519:
-		return parseED25519(in)
-	case CertAlgoRSAv01, CertAlgoDSAv01, CertAlgoECDSA256v01, CertAlgoECDSA384v01, CertAlgoECDSA521v01, CertAlgoED25519v01:
-		cert, err := parseCert(in, certToPrivAlgo(algo))
-		if err != nil {
-			return nil, nil, err
-		}
-		return cert, nil, nil
-	}
-	return nil, nil, fmt.Errorf("ssh: unknown key algorithm: %v", algo)
-}
-
-// parseAuthorizedKey parses a public key in OpenSSH authorized_keys format
-// (see sshd(8) manual page) once the options and key type fields have been
-// removed.
-func parseAuthorizedKey(in []byte) (out PublicKey, comment string, err error) {
-	in = bytes.TrimSpace(in)
-
-	i := bytes.IndexAny(in, " \t")
-	if i == -1 {
-		i = len(in)
-	}
-	base64Key := in[:i]
-
-	key := make([]byte, base64.StdEncoding.DecodedLen(len(base64Key)))
-	n, err := base64.StdEncoding.Decode(key, base64Key)
-	if err != nil {
-		return nil, "", err
-	}
-	key = key[:n]
-	out, err = ParsePublicKey(key)
-	if err != nil {
-		return nil, "", err
-	}
-	comment = string(bytes.TrimSpace(in[i:]))
-	return out, comment, nil
-}
-
-// ParseKnownHosts parses an entry in the format of the known_hosts file.
-//
-// The known_hosts format is documented in the sshd(8) manual page. This
-// function will parse a single entry from in. On successful return, marker
-// will contain the optional marker value (i.e. "cert-authority" or "revoked")
-// or else be empty, hosts will contain the hosts that this entry matches,
-// pubKey will contain the public key and comment will contain any trailing
-// comment at the end of the line. See the sshd(8) manual page for the various
-// forms that a host string can take.
-//
-// The unparsed remainder of the input will be returned in rest. This function
-// can be called repeatedly to parse multiple entries.
-//
-// If no entries were found in the input then err will be io.EOF. Otherwise a
-// non-nil err value indicates a parse error.
-func ParseKnownHosts(in []byte) (marker string, hosts []string, pubKey PublicKey, comment string, rest []byte, err error) {
-	for len(in) > 0 {
-		end := bytes.IndexByte(in, '\n')
-		if end != -1 {
-			rest = in[end+1:]
-			in = in[:end]
-		} else {
-			rest = nil
-		}
-
-		end = bytes.IndexByte(in, '\r')
-		if end != -1 {
-			in = in[:end]
-		}
-
-		in = bytes.TrimSpace(in)
-		if len(in) == 0 || in[0] == '#' {
-			in = rest
-			continue
-		}
-
-		i := bytes.IndexAny(in, " \t")
-		if i == -1 {
-			in = rest
-			continue
-		}
-
-		// Strip out the beginning of the known_host key.
-		// This is either an optional marker or a (set of) hostname(s).
-		keyFields := bytes.Fields(in)
-		if len(keyFields) < 3 || len(keyFields) > 5 {
-			return "", nil, nil, "", nil, errors.New("ssh: invalid entry in known_hosts data")
-		}
-
-		// keyFields[0] is either "@cert-authority", "@revoked" or a comma separated
-		// list of hosts
-		marker := ""
-		if keyFields[0][0] == '@' {
-			marker = string(keyFields[0][1:])
-			keyFields = keyFields[1:]
-		}
-
-		hosts := string(keyFields[0])
-		// keyFields[1] contains the key type (e.g. “ssh-rsa”).
-		// However, that information is duplicated inside the
-		// base64-encoded key and so is ignored here.
-
-		key := bytes.Join(keyFields[2:], []byte(" "))
-		if pubKey, comment, err = parseAuthorizedKey(key); err != nil {
-			return "", nil, nil, "", nil, err
-		}
-
-		return marker, strings.Split(hosts, ","), pubKey, comment, rest, nil
-	}
-
-	return "", nil, nil, "", nil, io.EOF
-}
-
-// ParseAuthorizedKeys parses a public key from an authorized_keys
-// file used in OpenSSH according to the sshd(8) manual page.
-func ParseAuthorizedKey(in []byte) (out PublicKey, comment string, options []string, rest []byte, err error) {
-	for len(in) > 0 {
-		end := bytes.IndexByte(in, '\n')
-		if end != -1 {
-			rest = in[end+1:]
-			in = in[:end]
-		} else {
-			rest = nil
-		}
-
-		end = bytes.IndexByte(in, '\r')
-		if end != -1 {
-			in = in[:end]
-		}
-
-		in = bytes.TrimSpace(in)
-		if len(in) == 0 || in[0] == '#' {
-			in = rest
-			continue
-		}
-
-		i := bytes.IndexAny(in, " \t")
-		if i == -1 {
-			in = rest
-			continue
-		}
-
-		if out, comment, err = parseAuthorizedKey(in[i:]); err == nil {
-			return out, comment, options, rest, nil
-		}
-
-		// No key type recognised. Maybe there's an options field at
-		// the beginning.
-		var b byte
-		inQuote := false
-		var candidateOptions []string
-		optionStart := 0
-		for i, b = range in {
-			isEnd := !inQuote && (b == ' ' || b == '\t')
-			if (b == ',' && !inQuote) || isEnd {
-				if i-optionStart > 0 {
-					candidateOptions = append(candidateOptions, string(in[optionStart:i]))
-				}
-				optionStart = i + 1
-			}
-			if isEnd {
-				break
-			}
-			if b == '"' && (i == 0 || (i > 0 && in[i-1] != '\\')) {
-				inQuote = !inQuote
-			}
-		}
-		for i < len(in) && (in[i] == ' ' || in[i] == '\t') {
-			i++
-		}
-		if i == len(in) {
-			// Invalid line: unmatched quote
-			in = rest
-			continue
-		}
-
-		in = in[i:]
-		i = bytes.IndexAny(in, " \t")
-		if i == -1 {
-			in = rest
-			continue
-		}
-
-		if out, comment, err = parseAuthorizedKey(in[i:]); err == nil {
-			options = candidateOptions
-			return out, comment, options, rest, nil
-		}
-
-		in = rest
-		continue
-	}
-
-	return nil, "", nil, nil, errors.New("ssh: no key found")
-}
-
-// ParsePublicKey parses an SSH public key formatted for use in
-// the SSH wire protocol according to RFC 4253, section 6.6.
-func ParsePublicKey(in []byte) (out PublicKey, err error) {
-	algo, in, ok := parseString(in)
-	if !ok {
-		return nil, errShortRead
-	}
-	var rest []byte
-	out, rest, err = parsePubKey(in, string(algo))
-	if len(rest) > 0 {
-		return nil, errors.New("ssh: trailing junk in public key")
-	}
-
-	return out, err
-}
-
-// MarshalAuthorizedKey serializes key for inclusion in an OpenSSH
-// authorized_keys file. The return value ends with newline.
-func MarshalAuthorizedKey(key PublicKey) []byte {
-	b := &bytes.Buffer{}
-	b.WriteString(key.Type())
-	b.WriteByte(' ')
-	e := base64.NewEncoder(base64.StdEncoding, b)
-	e.Write(key.Marshal())
-	e.Close()
-	b.WriteByte('\n')
-	return b.Bytes()
-}
-
-// PublicKey is an abstraction of different types of public keys.
-type PublicKey interface {
-	// Type returns the key's type, e.g. "ssh-rsa".
-	Type() string
-
-	// Marshal returns the serialized key data in SSH wire format,
-	// with the name prefix.
-	Marshal() []byte
-
-	// Verify that sig is a signature on the given data using this
-	// key. This function will hash the data appropriately first.
-	Verify(data []byte, sig *Signature) error
-}
-
-// CryptoPublicKey, if implemented by a PublicKey,
-// returns the underlying crypto.PublicKey form of the key.
-type CryptoPublicKey interface {
-	CryptoPublicKey() crypto.PublicKey
-}
-
-// A Signer can create signatures that verify against a public key.
-type Signer interface {
-	// PublicKey returns an associated PublicKey instance.
-	PublicKey() PublicKey
-
-	// Sign returns raw signature for the given data. This method
-	// will apply the hash specified for the keytype to the data.
-	Sign(rand io.Reader, data []byte) (*Signature, error)
-}
-
-type rsaPublicKey rsa.PublicKey
-
-func (r *rsaPublicKey) Type() string {
-	return "ssh-rsa"
-}
-
-// parseRSA parses an RSA key according to RFC 4253, section 6.6.
-func parseRSA(in []byte) (out PublicKey, rest []byte, err error) {
-	var w struct {
-		E    *big.Int
-		N    *big.Int
-		Rest []byte `ssh:"rest"`
-	}
-	if err := Unmarshal(in, &w); err != nil {
-		return nil, nil, err
-	}
-
-	if w.E.BitLen() > 24 {
-		return nil, nil, errors.New("ssh: exponent too large")
-	}
-	e := w.E.Int64()
-	if e < 3 || e&1 == 0 {
-		return nil, nil, errors.New("ssh: incorrect exponent")
-	}
-
-	var key rsa.PublicKey
-	key.E = int(e)
-	key.N = w.N
-	return (*rsaPublicKey)(&key), w.Rest, nil
-}
-
-func (r *rsaPublicKey) Marshal() []byte {
-	e := new(big.Int).SetInt64(int64(r.E))
-	// RSA publickey struct layout should match the struct used by
-	// parseRSACert in the x/crypto/ssh/agent package.
-	wirekey := struct {
-		Name string
-		E    *big.Int
-		N    *big.Int
-	}{
-		KeyAlgoRSA,
-		e,
-		r.N,
-	}
-	return Marshal(&wirekey)
-}
-
-func (r *rsaPublicKey) Verify(data []byte, sig *Signature) error {
-	if sig.Format != r.Type() {
-		return fmt.Errorf("ssh: signature type %s for key type %s", sig.Format, r.Type())
-	}
-	h := crypto.SHA1.New()
-	h.Write(data)
-	digest := h.Sum(nil)
-	return rsa.VerifyPKCS1v15((*rsa.PublicKey)(r), crypto.SHA1, digest, sig.Blob)
-}
-
-func (r *rsaPublicKey) CryptoPublicKey() crypto.PublicKey {
-	return (*rsa.PublicKey)(r)
-}
-
-type dsaPublicKey dsa.PublicKey
-
-func (r *dsaPublicKey) Type() string {
-	return "ssh-dss"
-}
-
-func checkDSAParams(param *dsa.Parameters) error {
-	// SSH specifies FIPS 186-2, which only provided a single size
-	// (1024 bits) DSA key. FIPS 186-3 allows for larger key
-	// sizes, which would confuse SSH.
-	if l := param.P.BitLen(); l != 1024 {
-		return fmt.Errorf("ssh: unsupported DSA key size %d", l)
-	}
-
-	return nil
-}
-
-// parseDSA parses an DSA key according to RFC 4253, section 6.6.
-func parseDSA(in []byte) (out PublicKey, rest []byte, err error) {
-	var w struct {
-		P, Q, G, Y *big.Int
-		Rest       []byte `ssh:"rest"`
-	}
-	if err := Unmarshal(in, &w); err != nil {
-		return nil, nil, err
-	}
-
-	param := dsa.Parameters{
-		P: w.P,
-		Q: w.Q,
-		G: w.G,
-	}
-	if err := checkDSAParams(&param); err != nil {
-		return nil, nil, err
-	}
-
-	key := &dsaPublicKey{
-		Parameters: param,
-		Y:          w.Y,
-	}
-	return key, w.Rest, nil
-}
-
-func (k *dsaPublicKey) Marshal() []byte {
-	// DSA publickey struct layout should match the struct used by
-	// parseDSACert in the x/crypto/ssh/agent package.
-	w := struct {
-		Name       string
-		P, Q, G, Y *big.Int
-	}{
-		k.Type(),
-		k.P,
-		k.Q,
-		k.G,
-		k.Y,
-	}
-
-	return Marshal(&w)
-}
-
-func (k *dsaPublicKey) Verify(data []byte, sig *Signature) error {
-	if sig.Format != k.Type() {
-		return fmt.Errorf("ssh: signature type %s for key type %s", sig.Format, k.Type())
-	}
-	h := crypto.SHA1.New()
-	h.Write(data)
-	digest := h.Sum(nil)
-
-	// Per RFC 4253, section 6.6,
-	// The value for 'dss_signature_blob' is encoded as a string containing
-	// r, followed by s (which are 160-bit integers, without lengths or
-	// padding, unsigned, and in network byte order).
-	// For DSS purposes, sig.Blob should be exactly 40 bytes in length.
-	if len(sig.Blob) != 40 {
-		return errors.New("ssh: DSA signature parse error")
-	}
-	r := new(big.Int).SetBytes(sig.Blob[:20])
-	s := new(big.Int).SetBytes(sig.Blob[20:])
-	if dsa.Verify((*dsa.PublicKey)(k), digest, r, s) {
-		return nil
-	}
-	return errors.New("ssh: signature did not verify")
-}
-
-func (k *dsaPublicKey) CryptoPublicKey() crypto.PublicKey {
-	return (*dsa.PublicKey)(k)
-}
-
-type dsaPrivateKey struct {
-	*dsa.PrivateKey
-}
-
-func (k *dsaPrivateKey) PublicKey() PublicKey {
-	return (*dsaPublicKey)(&k.PrivateKey.PublicKey)
-}
-
-func (k *dsaPrivateKey) Sign(rand io.Reader, data []byte) (*Signature, error) {
-	h := crypto.SHA1.New()
-	h.Write(data)
-	digest := h.Sum(nil)
-	r, s, err := dsa.Sign(rand, k.PrivateKey, digest)
-	if err != nil {
-		return nil, err
-	}
-
-	sig := make([]byte, 40)
-	rb := r.Bytes()
-	sb := s.Bytes()
-
-	copy(sig[20-len(rb):20], rb)
-	copy(sig[40-len(sb):], sb)
-
-	return &Signature{
-		Format: k.PublicKey().Type(),
-		Blob:   sig,
-	}, nil
-}
-
-type ecdsaPublicKey ecdsa.PublicKey
-
-func (key *ecdsaPublicKey) Type() string {
-	return "ecdsa-sha2-" + key.nistID()
-}
-
-func (key *ecdsaPublicKey) nistID() string {
-	switch key.Params().BitSize {
-	case 256:
-		return "nistp256"
-	case 384:
-		return "nistp384"
-	case 521:
-		return "nistp521"
-	}
-	panic("ssh: unsupported ecdsa key size")
-}
-
-type ed25519PublicKey ed25519.PublicKey
-
-func (key ed25519PublicKey) Type() string {
-	return KeyAlgoED25519
-}
-
-func parseED25519(in []byte) (out PublicKey, rest []byte, err error) {
-	var w struct {
-		KeyBytes []byte
-		Rest     []byte `ssh:"rest"`
-	}
-
-	if err := Unmarshal(in, &w); err != nil {
-		return nil, nil, err
-	}
-
-	key := ed25519.PublicKey(w.KeyBytes)
-
-	return (ed25519PublicKey)(key), w.Rest, nil
-}
-
-func (key ed25519PublicKey) Marshal() []byte {
-	w := struct {
-		Name     string
-		KeyBytes []byte
-	}{
-		KeyAlgoED25519,
-		[]byte(key),
-	}
-	return Marshal(&w)
-}
-
-func (key ed25519PublicKey) Verify(b []byte, sig *Signature) error {
-	if sig.Format != key.Type() {
-		return fmt.Errorf("ssh: signature type %s for key type %s", sig.Format, key.Type())
-	}
-
-	edKey := (ed25519.PublicKey)(key)
-	if ok := ed25519.Verify(edKey, b, sig.Blob); !ok {
-		return errors.New("ssh: signature did not verify")
-	}
-
-	return nil
-}
-
-func (k ed25519PublicKey) CryptoPublicKey() crypto.PublicKey {
-	return ed25519.PublicKey(k)
-}
-
-func supportedEllipticCurve(curve elliptic.Curve) bool {
-	return curve == elliptic.P256() || curve == elliptic.P384() || curve == elliptic.P521()
-}
-
-// ecHash returns the hash to match the given elliptic curve, see RFC
-// 5656, section 6.2.1
-func ecHash(curve elliptic.Curve) crypto.Hash {
-	bitSize := curve.Params().BitSize
-	switch {
-	case bitSize <= 256:
-		return crypto.SHA256
-	case bitSize <= 384:
-		return crypto.SHA384
-	}
-	return crypto.SHA512
-}
-
-// parseECDSA parses an ECDSA key according to RFC 5656, section 3.1.
-func parseECDSA(in []byte) (out PublicKey, rest []byte, err error) {
-	var w struct {
-		Curve    string
-		KeyBytes []byte
-		Rest     []byte `ssh:"rest"`
-	}
-
-	if err := Unmarshal(in, &w); err != nil {
-		return nil, nil, err
-	}
-
-	key := new(ecdsa.PublicKey)
-
-	switch w.Curve {
-	case "nistp256":
-		key.Curve = elliptic.P256()
-	case "nistp384":
-		key.Curve = elliptic.P384()
-	case "nistp521":
-		key.Curve = elliptic.P521()
-	default:
-		return nil, nil, errors.New("ssh: unsupported curve")
-	}
-
-	key.X, key.Y = elliptic.Unmarshal(key.Curve, w.KeyBytes)
-	if key.X == nil || key.Y == nil {
-		return nil, nil, errors.New("ssh: invalid curve point")
-	}
-	return (*ecdsaPublicKey)(key), w.Rest, nil
-}
-
-func (key *ecdsaPublicKey) Marshal() []byte {
-	// See RFC 5656, section 3.1.
-	keyBytes := elliptic.Marshal(key.Curve, key.X, key.Y)
-	// ECDSA publickey struct layout should match the struct used by
-	// parseECDSACert in the x/crypto/ssh/agent package.
-	w := struct {
-		Name string
-		ID   string
-		Key  []byte
-	}{
-		key.Type(),
-		key.nistID(),
-		keyBytes,
-	}
-
-	return Marshal(&w)
-}
-
-func (key *ecdsaPublicKey) Verify(data []byte, sig *Signature) error {
-	if sig.Format != key.Type() {
-		return fmt.Errorf("ssh: signature type %s for key type %s", sig.Format, key.Type())
-	}
-
-	h := ecHash(key.Curve).New()
-	h.Write(data)
-	digest := h.Sum(nil)
-
-	// Per RFC 5656, section 3.1.2,
-	// The ecdsa_signature_blob value has the following specific encoding:
-	//    mpint    r
-	//    mpint    s
-	var ecSig struct {
-		R *big.Int
-		S *big.Int
-	}
-
-	if err := Unmarshal(sig.Blob, &ecSig); err != nil {
-		return err
-	}
-
-	if ecdsa.Verify((*ecdsa.PublicKey)(key), digest, ecSig.R, ecSig.S) {
-		return nil
-	}
-	return errors.New("ssh: signature did not verify")
-}
-
-func (k *ecdsaPublicKey) CryptoPublicKey() crypto.PublicKey {
-	return (*ecdsa.PublicKey)(k)
-}
-
-// NewSignerFromKey takes an *rsa.PrivateKey, *dsa.PrivateKey,
-// *ecdsa.PrivateKey or any other crypto.Signer and returns a
-// corresponding Signer instance. ECDSA keys must use P-256, P-384 or
-// P-521. DSA keys must use parameter size L1024N160.
-func NewSignerFromKey(key interface{}) (Signer, error) {
-	switch key := key.(type) {
-	case crypto.Signer:
-		return NewSignerFromSigner(key)
-	case *dsa.PrivateKey:
-		return newDSAPrivateKey(key)
-	default:
-		return nil, fmt.Errorf("ssh: unsupported key type %T", key)
-	}
-}
-
-func newDSAPrivateKey(key *dsa.PrivateKey) (Signer, error) {
-	if err := checkDSAParams(&key.PublicKey.Parameters); err != nil {
-		return nil, err
-	}
-
-	return &dsaPrivateKey{key}, nil
-}
-
-type wrappedSigner struct {
-	signer crypto.Signer
-	pubKey PublicKey
-}
-
-// NewSignerFromSigner takes any crypto.Signer implementation and
-// returns a corresponding Signer interface. This can be used, for
-// example, with keys kept in hardware modules.
-func NewSignerFromSigner(signer crypto.Signer) (Signer, error) {
-	pubKey, err := NewPublicKey(signer.Public())
-	if err != nil {
-		return nil, err
-	}
-
-	return &wrappedSigner{signer, pubKey}, nil
-}
-
-func (s *wrappedSigner) PublicKey() PublicKey {
-	return s.pubKey
-}
-
-func (s *wrappedSigner) Sign(rand io.Reader, data []byte) (*Signature, error) {
-	var hashFunc crypto.Hash
-
-	switch key := s.pubKey.(type) {
-	case *rsaPublicKey, *dsaPublicKey:
-		hashFunc = crypto.SHA1
-	case *ecdsaPublicKey:
-		hashFunc = ecHash(key.Curve)
-	case ed25519PublicKey:
-	default:
-		return nil, fmt.Errorf("ssh: unsupported key type %T", key)
-	}
-
-	var digest []byte
-	if hashFunc != 0 {
-		h := hashFunc.New()
-		h.Write(data)
-		digest = h.Sum(nil)
-	} else {
-		digest = data
-	}
-
-	signature, err := s.signer.Sign(rand, digest, hashFunc)
-	if err != nil {
-		return nil, err
-	}
-
-	// crypto.Signer.Sign is expected to return an ASN.1-encoded signature
-	// for ECDSA and DSA, but that's not the encoding expected by SSH, so
-	// re-encode.
-	switch s.pubKey.(type) {
-	case *ecdsaPublicKey, *dsaPublicKey:
-		type asn1Signature struct {
-			R, S *big.Int
-		}
-		asn1Sig := new(asn1Signature)
-		_, err := asn1.Unmarshal(signature, asn1Sig)
-		if err != nil {
-			return nil, err
-		}
-
-		switch s.pubKey.(type) {
-		case *ecdsaPublicKey:
-			signature = Marshal(asn1Sig)
-
-		case *dsaPublicKey:
-			signature = make([]byte, 40)
-			r := asn1Sig.R.Bytes()
-			s := asn1Sig.S.Bytes()
-			copy(signature[20-len(r):20], r)
-			copy(signature[40-len(s):40], s)
-		}
-	}
-
-	return &Signature{
-		Format: s.pubKey.Type(),
-		Blob:   signature,
-	}, nil
-}
-
-// NewPublicKey takes an *rsa.PublicKey, *dsa.PublicKey, *ecdsa.PublicKey,
-// or ed25519.PublicKey returns a corresponding PublicKey instance.
-// ECDSA keys must use P-256, P-384 or P-521.
-func NewPublicKey(key interface{}) (PublicKey, error) {
-	switch key := key.(type) {
-	case *rsa.PublicKey:
-		return (*rsaPublicKey)(key), nil
-	case *ecdsa.PublicKey:
-		if !supportedEllipticCurve(key.Curve) {
-			return nil, errors.New("ssh: only P-256, P-384 and P-521 EC keys are supported.")
-		}
-		return (*ecdsaPublicKey)(key), nil
-	case *dsa.PublicKey:
-		return (*dsaPublicKey)(key), nil
-	case ed25519.PublicKey:
-		return (ed25519PublicKey)(key), nil
-	default:
-		return nil, fmt.Errorf("ssh: unsupported key type %T", key)
-	}
-}
-
-// ParsePrivateKey returns a Signer from a PEM encoded private key. It supports
-// the same keys as ParseRawPrivateKey.
-func ParsePrivateKey(pemBytes []byte) (Signer, error) {
-	key, err := ParseRawPrivateKey(pemBytes)
-	if err != nil {
-		return nil, err
-	}
-
-	return NewSignerFromKey(key)
-}
-
-// ParsePrivateKeyWithPassphrase returns a Signer from a PEM encoded private
-// key and passphrase. It supports the same keys as
-// ParseRawPrivateKeyWithPassphrase.
-func ParsePrivateKeyWithPassphrase(pemBytes, passPhrase []byte) (Signer, error) {
-	key, err := ParseRawPrivateKeyWithPassphrase(pemBytes, passPhrase)
-	if err != nil {
-		return nil, err
-	}
-
-	return NewSignerFromKey(key)
-}
-
-// encryptedBlock tells whether a private key is
-// encrypted by examining its Proc-Type header
-// for a mention of ENCRYPTED
-// according to RFC 1421 Section 4.6.1.1.
-func encryptedBlock(block *pem.Block) bool {
-	return strings.Contains(block.Headers["Proc-Type"], "ENCRYPTED")
-}
-
-// ParseRawPrivateKey returns a private key from a PEM encoded private key. It
-// supports RSA (PKCS#1), DSA (OpenSSL), and ECDSA private keys.
-func ParseRawPrivateKey(pemBytes []byte) (interface{}, error) {
-	block, _ := pem.Decode(pemBytes)
-	if block == nil {
-		return nil, errors.New("ssh: no key found")
-	}
-
-	if encryptedBlock(block) {
-		return nil, errors.New("ssh: cannot decode encrypted private keys")
-	}
-
-	switch block.Type {
-	case "RSA PRIVATE KEY":
-		return x509.ParsePKCS1PrivateKey(block.Bytes)
-	case "EC PRIVATE KEY":
-		return x509.ParseECPrivateKey(block.Bytes)
-	case "DSA PRIVATE KEY":
-		return ParseDSAPrivateKey(block.Bytes)
-	case "OPENSSH PRIVATE KEY":
-		return parseOpenSSHPrivateKey(block.Bytes)
-	default:
-		return nil, fmt.Errorf("ssh: unsupported key type %q", block.Type)
-	}
-}
-
-// ParseRawPrivateKeyWithPassphrase returns a private key decrypted with
-// passphrase from a PEM encoded private key. If wrong passphrase, return
-// x509.IncorrectPasswordError.
-func ParseRawPrivateKeyWithPassphrase(pemBytes, passPhrase []byte) (interface{}, error) {
-	block, _ := pem.Decode(pemBytes)
-	if block == nil {
-		return nil, errors.New("ssh: no key found")
-	}
-	buf := block.Bytes
-
-	if encryptedBlock(block) {
-		if x509.IsEncryptedPEMBlock(block) {
-			var err error
-			buf, err = x509.DecryptPEMBlock(block, passPhrase)
-			if err != nil {
-				if err == x509.IncorrectPasswordError {
-					return nil, err
-				}
-				return nil, fmt.Errorf("ssh: cannot decode encrypted private keys: %v", err)
-			}
-		}
-	}
-
-	switch block.Type {
-	case "RSA PRIVATE KEY":
-		return x509.ParsePKCS1PrivateKey(buf)
-	case "EC PRIVATE KEY":
-		return x509.ParseECPrivateKey(buf)
-	case "DSA PRIVATE KEY":
-		return ParseDSAPrivateKey(buf)
-	case "OPENSSH PRIVATE KEY":
-		return parseOpenSSHPrivateKey(buf)
-	default:
-		return nil, fmt.Errorf("ssh: unsupported key type %q", block.Type)
-	}
-}
-
-// ParseDSAPrivateKey returns a DSA private key from its ASN.1 DER encoding, as
-// specified by the OpenSSL DSA man page.
-func ParseDSAPrivateKey(der []byte) (*dsa.PrivateKey, error) {
-	var k struct {
-		Version int
-		P       *big.Int
-		Q       *big.Int
-		G       *big.Int
-		Pub     *big.Int
-		Priv    *big.Int
-	}
-	rest, err := asn1.Unmarshal(der, &k)
-	if err != nil {
-		return nil, errors.New("ssh: failed to parse DSA key: " + err.Error())
-	}
-	if len(rest) > 0 {
-		return nil, errors.New("ssh: garbage after DSA key")
-	}
-
-	return &dsa.PrivateKey{
-		PublicKey: dsa.PublicKey{
-			Parameters: dsa.Parameters{
-				P: k.P,
-				Q: k.Q,
-				G: k.G,
-			},
-			Y: k.Pub,
-		},
-		X: k.Priv,
-	}, nil
-}
-
-// Implemented based on the documentation at
-// https://github.com/openssh/openssh-portable/blob/master/PROTOCOL.key
-func parseOpenSSHPrivateKey(key []byte) (crypto.PrivateKey, error) {
-	magic := append([]byte("openssh-key-v1"), 0)
-	if !bytes.Equal(magic, key[0:len(magic)]) {
-		return nil, errors.New("ssh: invalid openssh private key format")
-	}
-	remaining := key[len(magic):]
-
-	var w struct {
-		CipherName   string
-		KdfName      string
-		KdfOpts      string
-		NumKeys      uint32
-		PubKey       []byte
-		PrivKeyBlock []byte
-	}
-
-	if err := Unmarshal(remaining, &w); err != nil {
-		return nil, err
-	}
-
-	if w.KdfName != "none" || w.CipherName != "none" {
-		return nil, errors.New("ssh: cannot decode encrypted private keys")
-	}
-
-	pk1 := struct {
-		Check1  uint32
-		Check2  uint32
-		Keytype string
-		Rest    []byte `ssh:"rest"`
-	}{}
-
-	if err := Unmarshal(w.PrivKeyBlock, &pk1); err != nil {
-		return nil, err
-	}
-
-	if pk1.Check1 != pk1.Check2 {
-		return nil, errors.New("ssh: checkint mismatch")
-	}
-
-	// we only handle ed25519 and rsa keys currently
-	switch pk1.Keytype {
-	case KeyAlgoRSA:
-		// https://github.com/openssh/openssh-portable/blob/master/sshkey.c#L2760-L2773
-		key := struct {
-			N       *big.Int
-			E       *big.Int
-			D       *big.Int
-			Iqmp    *big.Int
-			P       *big.Int
-			Q       *big.Int
-			Comment string
-			Pad     []byte `ssh:"rest"`
-		}{}
-
-		if err := Unmarshal(pk1.Rest, &key); err != nil {
-			return nil, err
-		}
-
-		for i, b := range key.Pad {
-			if int(b) != i+1 {
-				return nil, errors.New("ssh: padding not as expected")
-			}
-		}
-
-		pk := &rsa.PrivateKey{
-			PublicKey: rsa.PublicKey{
-				N: key.N,
-				E: int(key.E.Int64()),
-			},
-			D:      key.D,
-			Primes: []*big.Int{key.P, key.Q},
-		}
-
-		if err := pk.Validate(); err != nil {
-			return nil, err
-		}
-
-		pk.Precompute()
-
-		return pk, nil
-	case KeyAlgoED25519:
-		key := struct {
-			Pub     []byte
-			Priv    []byte
-			Comment string
-			Pad     []byte `ssh:"rest"`
-		}{}
-
-		if err := Unmarshal(pk1.Rest, &key); err != nil {
-			return nil, err
-		}
-
-		if len(key.Priv) != ed25519.PrivateKeySize {
-			return nil, errors.New("ssh: private key unexpected length")
-		}
-
-		for i, b := range key.Pad {
-			if int(b) != i+1 {
-				return nil, errors.New("ssh: padding not as expected")
-			}
-		}
-
-		pk := ed25519.PrivateKey(make([]byte, ed25519.PrivateKeySize))
-		copy(pk, key.Priv)
-		return &pk, nil
-	default:
-		return nil, errors.New("ssh: unhandled key type")
-	}
-}
-
-// FingerprintLegacyMD5 returns the user presentation of the key's
-// fingerprint as described by RFC 4716 section 4.
-func FingerprintLegacyMD5(pubKey PublicKey) string {
-	md5sum := md5.Sum(pubKey.Marshal())
-	hexarray := make([]string, len(md5sum))
-	for i, c := range md5sum {
-		hexarray[i] = hex.EncodeToString([]byte{c})
-	}
-	return strings.Join(hexarray, ":")
-}
-
-// FingerprintSHA256 returns the user presentation of the key's
-// fingerprint as unpadded base64 encoded sha256 hash.
-// This format was introduced from OpenSSH 6.8.
-// https://www.openssh.com/txt/release-6.8
-// https://tools.ietf.org/html/rfc4648#section-3.2 (unpadded base64 encoding)
-func FingerprintSHA256(pubKey PublicKey) string {
-	sha256sum := sha256.Sum256(pubKey.Marshal())
-	hash := base64.RawStdEncoding.EncodeToString(sha256sum[:])
-	return "SHA256:" + hash
-}

vendor/golang.org/x/crypto/ssh/mac.go

@@ -1,61 +0,0 @@
-// Copyright 2012 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package ssh
-
-// Message authentication support
-
-import (
-	"crypto/hmac"
-	"crypto/sha1"
-	"crypto/sha256"
-	"hash"
-)
-
-type macMode struct {
-	keySize int
-	etm     bool
-	new     func(key []byte) hash.Hash
-}
-
-// truncatingMAC wraps around a hash.Hash and truncates the output digest to
-// a given size.
-type truncatingMAC struct {
-	length int
-	hmac   hash.Hash
-}
-
-func (t truncatingMAC) Write(data []byte) (int, error) {
-	return t.hmac.Write(data)
-}
-
-func (t truncatingMAC) Sum(in []byte) []byte {
-	out := t.hmac.Sum(in)
-	return out[:len(in)+t.length]
-}
-
-func (t truncatingMAC) Reset() {
-	t.hmac.Reset()
-}
-
-func (t truncatingMAC) Size() int {
-	return t.length
-}
-
-func (t truncatingMAC) BlockSize() int { return t.hmac.BlockSize() }
-
-var macModes = map[string]*macMode{
-	"hmac-sha2-256-etm@openssh.com": {32, true, func(key []byte) hash.Hash {
-		return hmac.New(sha256.New, key)
-	}},
-	"hmac-sha2-256": {32, false, func(key []byte) hash.Hash {
-		return hmac.New(sha256.New, key)
-	}},
-	"hmac-sha1": {20, false, func(key []byte) hash.Hash {
-		return hmac.New(sha1.New, key)
-	}},
-	"hmac-sha1-96": {20, false, func(key []byte) hash.Hash {
-		return truncatingMAC{12, hmac.New(sha1.New, key)}
-	}},
-}

vendor/golang.org/x/crypto/ssh/messages.go

@@ -1,758 +0,0 @@
-// Copyright 2011 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package ssh
-
-import (
-	"bytes"
-	"encoding/binary"
-	"errors"
-	"fmt"
-	"io"
-	"math/big"
-	"reflect"
-	"strconv"
-	"strings"
-)
-
-// These are SSH message type numbers. They are scattered around several
-// documents but many were taken from [SSH-PARAMETERS].
-const (
-	msgIgnore        = 2
-	msgUnimplemented = 3
-	msgDebug         = 4
-	msgNewKeys       = 21
-
-	// Standard authentication messages
-	msgUserAuthSuccess = 52
-	msgUserAuthBanner  = 53
-)
-
-// SSH messages:
-//
-// These structures mirror the wire format of the corresponding SSH messages.
-// They are marshaled using reflection with the marshal and unmarshal functions
-// in this file. The only wrinkle is that a final member of type []byte with a
-// ssh tag of "rest" receives the remainder of a packet when unmarshaling.
-
-// See RFC 4253, section 11.1.
-const msgDisconnect = 1
-
-// disconnectMsg is the message that signals a disconnect. It is also
-// the error type returned from mux.Wait()
-type disconnectMsg struct {
-	Reason   uint32 `sshtype:"1"`
-	Message  string
-	Language string
-}
-
-func (d *disconnectMsg) Error() string {
-	return fmt.Sprintf("ssh: disconnect, reason %d: %s", d.Reason, d.Message)
-}
-
-// See RFC 4253, section 7.1.
-const msgKexInit = 20
-
-type kexInitMsg struct {
-	Cookie                  [16]byte `sshtype:"20"`
-	KexAlgos                []string
-	ServerHostKeyAlgos      []string
-	CiphersClientServer     []string
-	CiphersServerClient     []string
-	MACsClientServer        []string
-	MACsServerClient        []string
-	CompressionClientServer []string
-	CompressionServerClient []string
-	LanguagesClientServer   []string
-	LanguagesServerClient   []string
-	FirstKexFollows         bool
-	Reserved                uint32
-}
-
-// See RFC 4253, section 8.
-
-// Diffie-Helman
-const msgKexDHInit = 30
-
-type kexDHInitMsg struct {
-	X *big.Int `sshtype:"30"`
-}
-
-const msgKexECDHInit = 30
-
-type kexECDHInitMsg struct {
-	ClientPubKey []byte `sshtype:"30"`
-}
-
-const msgKexECDHReply = 31
-
-type kexECDHReplyMsg struct {
-	HostKey         []byte `sshtype:"31"`
-	EphemeralPubKey []byte
-	Signature       []byte
-}
-
-const msgKexDHReply = 31
-
-type kexDHReplyMsg struct {
-	HostKey   []byte `sshtype:"31"`
-	Y         *big.Int
-	Signature []byte
-}
-
-// See RFC 4253, section 10.
-const msgServiceRequest = 5
-
-type serviceRequestMsg struct {
-	Service string `sshtype:"5"`
-}
-
-// See RFC 4253, section 10.
-const msgServiceAccept = 6
-
-type serviceAcceptMsg struct {
-	Service string `sshtype:"6"`
-}
-
-// See RFC 4252, section 5.
-const msgUserAuthRequest = 50
-
-type userAuthRequestMsg struct {
-	User    string `sshtype:"50"`
-	Service string
-	Method  string
-	Payload []byte `ssh:"rest"`
-}
-
-// Used for debug printouts of packets.
-type userAuthSuccessMsg struct {
-}
-
-// See RFC 4252, section 5.1
-const msgUserAuthFailure = 51
-
-type userAuthFailureMsg struct {
-	Methods        []string `sshtype:"51"`
-	PartialSuccess bool
-}
-
-// See RFC 4256, section 3.2
-const msgUserAuthInfoRequest = 60
-const msgUserAuthInfoResponse = 61
-
-type userAuthInfoRequestMsg struct {
-	User               string `sshtype:"60"`
-	Instruction        string
-	DeprecatedLanguage string
-	NumPrompts         uint32
-	Prompts            []byte `ssh:"rest"`
-}
-
-// See RFC 4254, section 5.1.
-const msgChannelOpen = 90
-
-type channelOpenMsg struct {
-	ChanType         string `sshtype:"90"`
-	PeersId          uint32
-	PeersWindow      uint32
-	MaxPacketSize    uint32
-	TypeSpecificData []byte `ssh:"rest"`
-}
-
-const msgChannelExtendedData = 95
-const msgChannelData = 94
-
-// Used for debug print outs of packets.
-type channelDataMsg struct {
-	PeersId uint32 `sshtype:"94"`
-	Length  uint32
-	Rest    []byte `ssh:"rest"`
-}
-
-// See RFC 4254, section 5.1.
-const msgChannelOpenConfirm = 91
-
-type channelOpenConfirmMsg struct {
-	PeersId          uint32 `sshtype:"91"`
-	MyId             uint32
-	MyWindow         uint32
-	MaxPacketSize    uint32
-	TypeSpecificData []byte `ssh:"rest"`
-}
-
-// See RFC 4254, section 5.1.
-const msgChannelOpenFailure = 92
-
-type channelOpenFailureMsg struct {
-	PeersId  uint32 `sshtype:"92"`
-	Reason   RejectionReason
-	Message  string
-	Language string
-}
-
-const msgChannelRequest = 98
-
-type channelRequestMsg struct {
-	PeersId             uint32 `sshtype:"98"`
-	Request             string
-	WantReply           bool
-	RequestSpecificData []byte `ssh:"rest"`
-}
-
-// See RFC 4254, section 5.4.
-const msgChannelSuccess = 99
-
-type channelRequestSuccessMsg struct {
-	PeersId uint32 `sshtype:"99"`
-}
-
-// See RFC 4254, section 5.4.
-const msgChannelFailure = 100
-
-type channelRequestFailureMsg struct {
-	PeersId uint32 `sshtype:"100"`
-}
-
-// See RFC 4254, section 5.3
-const msgChannelClose = 97
-
-type channelCloseMsg struct {
-	PeersId uint32 `sshtype:"97"`
-}
-
-// See RFC 4254, section 5.3
-const msgChannelEOF = 96
-
-type channelEOFMsg struct {
-	PeersId uint32 `sshtype:"96"`
-}
-
-// See RFC 4254, section 4
-const msgGlobalRequest = 80
-
-type globalRequestMsg struct {
-	Type      string `sshtype:"80"`
-	WantReply bool
-	Data      []byte `ssh:"rest"`
-}
-
-// See RFC 4254, section 4
-const msgRequestSuccess = 81
-
-type globalRequestSuccessMsg struct {
-	Data []byte `ssh:"rest" sshtype:"81"`
-}
-
-// See RFC 4254, section 4
-const msgRequestFailure = 82
-
-type globalRequestFailureMsg struct {
-	Data []byte `ssh:"rest" sshtype:"82"`
-}
-
-// See RFC 4254, section 5.2
-const msgChannelWindowAdjust = 93
-
-type windowAdjustMsg struct {
-	PeersId         uint32 `sshtype:"93"`
-	AdditionalBytes uint32
-}
-
-// See RFC 4252, section 7
-const msgUserAuthPubKeyOk = 60
-
-type userAuthPubKeyOkMsg struct {
-	Algo   string `sshtype:"60"`
-	PubKey []byte
-}
-
-// typeTags returns the possible type bytes for the given reflect.Type, which
-// should be a struct. The possible values are separated by a '|' character.
-func typeTags(structType reflect.Type) (tags []byte) {
-	tagStr := structType.Field(0).Tag.Get("sshtype")
-
-	for _, tag := range strings.Split(tagStr, "|") {
-		i, err := strconv.Atoi(tag)
-		if err == nil {
-			tags = append(tags, byte(i))
-		}
-	}
-
-	return tags
-}
-
-func fieldError(t reflect.Type, field int, problem string) error {
-	if problem != "" {
-		problem = ": " + problem
-	}
-	return fmt.Errorf("ssh: unmarshal error for field %s of type %s%s", t.Field(field).Name, t.Name(), problem)
-}
-
-var errShortRead = errors.New("ssh: short read")
-
-// Unmarshal parses data in SSH wire format into a structure. The out
-// argument should be a pointer to struct. If the first member of the
-// struct has the "sshtype" tag set to a '|'-separated set of numbers
-// in decimal, the packet must start with one of those numbers. In
-// case of error, Unmarshal returns a ParseError or
-// UnexpectedMessageError.
-func Unmarshal(data []byte, out interface{}) error {
-	v := reflect.ValueOf(out).Elem()
-	structType := v.Type()
-	expectedTypes := typeTags(structType)
-
-	var expectedType byte
-	if len(expectedTypes) > 0 {
-		expectedType = expectedTypes[0]
-	}
-
-	if len(data) == 0 {
-		return parseError(expectedType)
-	}
-
-	if len(expectedTypes) > 0 {
-		goodType := false
-		for _, e := range expectedTypes {
-			if e > 0 && data[0] == e {
-				goodType = true
-				break
-			}
-		}
-		if !goodType {
-			return fmt.Errorf("ssh: unexpected message type %d (expected one of %v)", data[0], expectedTypes)
-		}
-		data = data[1:]
-	}
-
-	var ok bool
-	for i := 0; i < v.NumField(); i++ {
-		field := v.Field(i)
-		t := field.Type()
-		switch t.Kind() {
-		case reflect.Bool:
-			if len(data) < 1 {
-				return errShortRead
-			}
-			field.SetBool(data[0] != 0)
-			data = data[1:]
-		case reflect.Array:
-			if t.Elem().Kind() != reflect.Uint8 {
-				return fieldError(structType, i, "array of unsupported type")
-			}
-			if len(data) < t.Len() {
-				return errShortRead
-			}
-			for j, n := 0, t.Len(); j < n; j++ {
-				field.Index(j).Set(reflect.ValueOf(data[j]))
-			}
-			data = data[t.Len():]
-		case reflect.Uint64:
-			var u64 uint64
-			if u64, data, ok = parseUint64(data); !ok {
-				return errShortRead
-			}
-			field.SetUint(u64)
-		case reflect.Uint32:
-			var u32 uint32
-			if u32, data, ok = parseUint32(data); !ok {
-				return errShortRead
-			}
-			field.SetUint(uint64(u32))
-		case reflect.Uint8:
-			if len(data) < 1 {
-				return errShortRead
-			}
-			field.SetUint(uint64(data[0]))
-			data = data[1:]
-		case reflect.String:
-			var s []byte
-			if s, data, ok = parseString(data); !ok {
-				return fieldError(structType, i, "")
-			}
-			field.SetString(string(s))
-		case reflect.Slice:
-			switch t.Elem().Kind() {
-			case reflect.Uint8:
-				if structType.Field(i).Tag.Get("ssh") == "rest" {
-					field.Set(reflect.ValueOf(data))
-					data = nil
-				} else {
-					var s []byte
-					if s, data, ok = parseString(data); !ok {
-						return errShortRead
-					}
-					field.Set(reflect.ValueOf(s))
-				}
-			case reflect.String:
-				var nl []string
-				if nl, data, ok = parseNameList(data); !ok {
-					return errShortRead
-				}
-				field.Set(reflect.ValueOf(nl))
-			default:
-				return fieldError(structType, i, "slice of unsupported type")
-			}
-		case reflect.Ptr:
-			if t == bigIntType {
-				var n *big.Int
-				if n, data, ok = parseInt(data); !ok {
-					return errShortRead
-				}
-				field.Set(reflect.ValueOf(n))
-			} else {
-				return fieldError(structType, i, "pointer to unsupported type")
-			}
-		default:
-			return fieldError(structType, i, fmt.Sprintf("unsupported type: %v", t))
-		}
-	}
-
-	if len(data) != 0 {
-		return parseError(expectedType)
-	}
-
-	return nil
-}
-
-// Marshal serializes the message in msg to SSH wire format.  The msg
-// argument should be a struct or pointer to struct. If the first
-// member has the "sshtype" tag set to a number in decimal, that
-// number is prepended to the result. If the last of member has the
-// "ssh" tag set to "rest", its contents are appended to the output.
-func Marshal(msg interface{}) []byte {
-	out := make([]byte, 0, 64)
-	return marshalStruct(out, msg)
-}
-
-func marshalStruct(out []byte, msg interface{}) []byte {
-	v := reflect.Indirect(reflect.ValueOf(msg))
-	msgTypes := typeTags(v.Type())
-	if len(msgTypes) > 0 {
-		out = append(out, msgTypes[0])
-	}
-
-	for i, n := 0, v.NumField(); i < n; i++ {
-		field := v.Field(i)
-		switch t := field.Type(); t.Kind() {
-		case reflect.Bool:
-			var v uint8
-			if field.Bool() {
-				v = 1
-			}
-			out = append(out, v)
-		case reflect.Array:
-			if t.Elem().Kind() != reflect.Uint8 {
-				panic(fmt.Sprintf("array of non-uint8 in field %d: %T", i, field.Interface()))
-			}
-			for j, l := 0, t.Len(); j < l; j++ {
-				out = append(out, uint8(field.Index(j).Uint()))
-			}
-		case reflect.Uint32:
-			out = appendU32(out, uint32(field.Uint()))
-		case reflect.Uint64:
-			out = appendU64(out, uint64(field.Uint()))
-		case reflect.Uint8:
-			out = append(out, uint8(field.Uint()))
-		case reflect.String:
-			s := field.String()
-			out = appendInt(out, len(s))
-			out = append(out, s...)
-		case reflect.Slice:
-			switch t.Elem().Kind() {
-			case reflect.Uint8:
-				if v.Type().Field(i).Tag.Get("ssh") != "rest" {
-					out = appendInt(out, field.Len())
-				}
-				out = append(out, field.Bytes()...)
-			case reflect.String:
-				offset := len(out)
-				out = appendU32(out, 0)
-				if n := field.Len(); n > 0 {
-					for j := 0; j < n; j++ {
-						f := field.Index(j)
-						if j != 0 {
-							out = append(out, ',')
-						}
-						out = append(out, f.String()...)
-					}
-					// overwrite length value
-					binary.BigEndian.PutUint32(out[offset:], uint32(len(out)-offset-4))
-				}
-			default:
-				panic(fmt.Sprintf("slice of unknown type in field %d: %T", i, field.Interface()))
-			}
-		case reflect.Ptr:
-			if t == bigIntType {
-				var n *big.Int
-				nValue := reflect.ValueOf(&n)
-				nValue.Elem().Set(field)
-				needed := intLength(n)
-				oldLength := len(out)
-
-				if cap(out)-len(out) < needed {
-					newOut := make([]byte, len(out), 2*(len(out)+needed))
-					copy(newOut, out)
-					out = newOut
-				}
-				out = out[:oldLength+needed]
-				marshalInt(out[oldLength:], n)
-			} else {
-				panic(fmt.Sprintf("pointer to unknown type in field %d: %T", i, field.Interface()))
-			}
-		}
-	}
-
-	return out
-}
-
-var bigOne = big.NewInt(1)
-
-func parseString(in []byte) (out, rest []byte, ok bool) {
-	if len(in) < 4 {
-		return
-	}
-	length := binary.BigEndian.Uint32(in)
-	in = in[4:]
-	if uint32(len(in)) < length {
-		return
-	}
-	out = in[:length]
-	rest = in[length:]
-	ok = true
-	return
-}
-
-var (
-	comma         = []byte{','}
-	emptyNameList = []string{}
-)
-
-func parseNameList(in []byte) (out []string, rest []byte, ok bool) {
-	contents, rest, ok := parseString(in)
-	if !ok {
-		return
-	}
-	if len(contents) == 0 {
-		out = emptyNameList
-		return
-	}
-	parts := bytes.Split(contents, comma)
-	out = make([]string, len(parts))
-	for i, part := range parts {
-		out[i] = string(part)
-	}
-	return
-}
-
-func parseInt(in []byte) (out *big.Int, rest []byte, ok bool) {
-	contents, rest, ok := parseString(in)
-	if !ok {
-		return
-	}
-	out = new(big.Int)
-
-	if len(contents) > 0 && contents[0]&0x80 == 0x80 {
-		// This is a negative number
-		notBytes := make([]byte, len(contents))
-		for i := range notBytes {
-			notBytes[i] = ^contents[i]
-		}
-		out.SetBytes(notBytes)
-		out.Add(out, bigOne)
-		out.Neg(out)
-	} else {
-		// Positive number
-		out.SetBytes(contents)
-	}
-	ok = true
-	return
-}
-
-func parseUint32(in []byte) (uint32, []byte, bool) {
-	if len(in) < 4 {
-		return 0, nil, false
-	}
-	return binary.BigEndian.Uint32(in), in[4:], true
-}
-
-func parseUint64(in []byte) (uint64, []byte, bool) {
-	if len(in) < 8 {
-		return 0, nil, false
-	}
-	return binary.BigEndian.Uint64(in), in[8:], true
-}
-
-func intLength(n *big.Int) int {
-	length := 4 /* length bytes */
-	if n.Sign() < 0 {
-		nMinus1 := new(big.Int).Neg(n)
-		nMinus1.Sub(nMinus1, bigOne)
-		bitLen := nMinus1.BitLen()
-		if bitLen%8 == 0 {
-			// The number will need 0xff padding
-			length++
-		}
-		length += (bitLen + 7) / 8
-	} else if n.Sign() == 0 {
-		// A zero is the zero length string
-	} else {
-		bitLen := n.BitLen()
-		if bitLen%8 == 0 {
-			// The number will need 0x00 padding
-			length++
-		}
-		length += (bitLen + 7) / 8
-	}
-
-	return length
-}
-
-func marshalUint32(to []byte, n uint32) []byte {
-	binary.BigEndian.PutUint32(to, n)
-	return to[4:]
-}
-
-func marshalUint64(to []byte, n uint64) []byte {
-	binary.BigEndian.PutUint64(to, n)
-	return to[8:]
-}
-
-func marshalInt(to []byte, n *big.Int) []byte {
-	lengthBytes := to
-	to = to[4:]
-	length := 0
-
-	if n.Sign() < 0 {
-		// A negative number has to be converted to two's-complement
-		// form. So we'll subtract 1 and invert. If the
-		// most-significant-bit isn't set then we'll need to pad the
-		// beginning with 0xff in order to keep the number negative.
-		nMinus1 := new(big.Int).Neg(n)
-		nMinus1.Sub(nMinus1, bigOne)
-		bytes := nMinus1.Bytes()
-		for i := range bytes {
-			bytes[i] ^= 0xff
-		}
-		if len(bytes) == 0 || bytes[0]&0x80 == 0 {
-			to[0] = 0xff
-			to = to[1:]
-			length++
-		}
-		nBytes := copy(to, bytes)
-		to = to[nBytes:]
-		length += nBytes
-	} else if n.Sign() == 0 {
-		// A zero is the zero length string
-	} else {
-		bytes := n.Bytes()
-		if len(bytes) > 0 && bytes[0]&0x80 != 0 {
-			// We'll have to pad this with a 0x00 in order to
-			// stop it looking like a negative number.
-			to[0] = 0
-			to = to[1:]
-			length++
-		}
-		nBytes := copy(to, bytes)
-		to = to[nBytes:]
-		length += nBytes
-	}
-
-	lengthBytes[0] = byte(length >> 24)
-	lengthBytes[1] = byte(length >> 16)
-	lengthBytes[2] = byte(length >> 8)
-	lengthBytes[3] = byte(length)
-	return to
-}
-
-func writeInt(w io.Writer, n *big.Int) {
-	length := intLength(n)
-	buf := make([]byte, length)
-	marshalInt(buf, n)
-	w.Write(buf)
-}
-
-func writeString(w io.Writer, s []byte) {
-	var lengthBytes [4]byte
-	lengthBytes[0] = byte(len(s) >> 24)
-	lengthBytes[1] = byte(len(s) >> 16)
-	lengthBytes[2] = byte(len(s) >> 8)
-	lengthBytes[3] = byte(len(s))
-	w.Write(lengthBytes[:])
-	w.Write(s)
-}
-
-func stringLength(n int) int {
-	return 4 + n
-}
-
-func marshalString(to []byte, s []byte) []byte {
-	to[0] = byte(len(s) >> 24)
-	to[1] = byte(len(s) >> 16)
-	to[2] = byte(len(s) >> 8)
-	to[3] = byte(len(s))
-	to = to[4:]
-	copy(to, s)
-	return to[len(s):]
-}
-
-var bigIntType = reflect.TypeOf((*big.Int)(nil))
-
-// Decode a packet into its corresponding message.
-func decode(packet []byte) (interface{}, error) {
-	var msg interface{}
-	switch packet[0] {
-	case msgDisconnect:
-		msg = new(disconnectMsg)
-	case msgServiceRequest:
-		msg = new(serviceRequestMsg)
-	case msgServiceAccept:
-		msg = new(serviceAcceptMsg)
-	case msgKexInit:
-		msg = new(kexInitMsg)
-	case msgKexDHInit:
-		msg = new(kexDHInitMsg)
-	case msgKexDHReply:
-		msg = new(kexDHReplyMsg)
-	case msgUserAuthRequest:
-		msg = new(userAuthRequestMsg)
-	case msgUserAuthSuccess:
-		return new(userAuthSuccessMsg), nil
-	case msgUserAuthFailure:
-		msg = new(userAuthFailureMsg)
-	case msgUserAuthPubKeyOk:
-		msg = new(userAuthPubKeyOkMsg)
-	case msgGlobalRequest:
-		msg = new(globalRequestMsg)
-	case msgRequestSuccess:
-		msg = new(globalRequestSuccessMsg)
-	case msgRequestFailure:
-		msg = new(globalRequestFailureMsg)
-	case msgChannelOpen:
-		msg = new(channelOpenMsg)
-	case msgChannelData:
-		msg = new(channelDataMsg)
-	case msgChannelOpenConfirm:
-		msg = new(channelOpenConfirmMsg)
-	case msgChannelOpenFailure:
-		msg = new(channelOpenFailureMsg)
-	case msgChannelWindowAdjust:
-		msg = new(windowAdjustMsg)
-	case msgChannelEOF:
-		msg = new(channelEOFMsg)
-	case msgChannelClose:
-		msg = new(channelCloseMsg)
-	case msgChannelRequest:
-		msg = new(channelRequestMsg)
-	case msgChannelSuccess:
-		msg = new(channelRequestSuccessMsg)
-	case msgChannelFailure:
-		msg = new(channelRequestFailureMsg)
-	default:
-		return nil, unexpectedMessageError(0, packet[0])
-	}
-	if err := Unmarshal(packet, msg); err != nil {
-		return nil, err
-	}
-	return msg, nil
-}

vendor/golang.org/x/crypto/ssh/mux.go

@@ -1,330 +0,0 @@
-// Copyright 2013 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package ssh
-
-import (
-	"encoding/binary"
-	"fmt"
-	"io"
-	"log"
-	"sync"
-	"sync/atomic"
-)
-
-// debugMux, if set, causes messages in the connection protocol to be
-// logged.
-const debugMux = false
-
-// chanList is a thread safe channel list.
-type chanList struct {
-	// protects concurrent access to chans
-	sync.Mutex
-
-	// chans are indexed by the local id of the channel, which the
-	// other side should send in the PeersId field.
-	chans []*channel
-
-	// This is a debugging aid: it offsets all IDs by this
-	// amount. This helps distinguish otherwise identical
-	// server/client muxes
-	offset uint32
-}
-
-// Assigns a channel ID to the given channel.
-func (c *chanList) add(ch *channel) uint32 {
-	c.Lock()
-	defer c.Unlock()
-	for i := range c.chans {
-		if c.chans[i] == nil {
-			c.chans[i] = ch
-			return uint32(i) + c.offset
-		}
-	}
-	c.chans = append(c.chans, ch)
-	return uint32(len(c.chans)-1) + c.offset
-}
-
-// getChan returns the channel for the given ID.
-func (c *chanList) getChan(id uint32) *channel {
-	id -= c.offset
-
-	c.Lock()
-	defer c.Unlock()
-	if id < uint32(len(c.chans)) {
-		return c.chans[id]
-	}
-	return nil
-}
-
-func (c *chanList) remove(id uint32) {
-	id -= c.offset
-	c.Lock()
-	if id < uint32(len(c.chans)) {
-		c.chans[id] = nil
-	}
-	c.Unlock()
-}
-
-// dropAll forgets all channels it knows, returning them in a slice.
-func (c *chanList) dropAll() []*channel {
-	c.Lock()
-	defer c.Unlock()
-	var r []*channel
-
-	for _, ch := range c.chans {
-		if ch == nil {
-			continue
-		}
-		r = append(r, ch)
-	}
-	c.chans = nil
-	return r
-}
-
-// mux represents the state for the SSH connection protocol, which
-// multiplexes many channels onto a single packet transport.
-type mux struct {
-	conn     packetConn
-	chanList chanList
-
-	incomingChannels chan NewChannel
-
-	globalSentMu     sync.Mutex
-	globalResponses  chan interface{}
-	incomingRequests chan *Request
-
-	errCond *sync.Cond
-	err     error
-}
-
-// When debugging, each new chanList instantiation has a different
-// offset.
-var globalOff uint32
-
-func (m *mux) Wait() error {
-	m.errCond.L.Lock()
-	defer m.errCond.L.Unlock()
-	for m.err == nil {
-		m.errCond.Wait()
-	}
-	return m.err
-}
-
-// newMux returns a mux that runs over the given connection.
-func newMux(p packetConn) *mux {
-	m := &mux{
-		conn:             p,
-		incomingChannels: make(chan NewChannel, chanSize),
-		globalResponses:  make(chan interface{}, 1),
-		incomingRequests: make(chan *Request, chanSize),
-		errCond:          newCond(),
-	}
-	if debugMux {
-		m.chanList.offset = atomic.AddUint32(&globalOff, 1)
-	}
-
-	go m.loop()
-	return m
-}
-
-func (m *mux) sendMessage(msg interface{}) error {
-	p := Marshal(msg)
-	if debugMux {
-		log.Printf("send global(%d): %#v", m.chanList.offset, msg)
-	}
-	return m.conn.writePacket(p)
-}
-
-func (m *mux) SendRequest(name string, wantReply bool, payload []byte) (bool, []byte, error) {
-	if wantReply {
-		m.globalSentMu.Lock()
-		defer m.globalSentMu.Unlock()
-	}
-
-	if err := m.sendMessage(globalRequestMsg{
-		Type:      name,
-		WantReply: wantReply,
-		Data:      payload,
-	}); err != nil {
-		return false, nil, err
-	}
-
-	if !wantReply {
-		return false, nil, nil
-	}
-
-	msg, ok := <-m.globalResponses
-	if !ok {
-		return false, nil, io.EOF
-	}
-	switch msg := msg.(type) {
-	case *globalRequestFailureMsg:
-		return false, msg.Data, nil
-	case *globalRequestSuccessMsg:
-		return true, msg.Data, nil
-	default:
-		return false, nil, fmt.Errorf("ssh: unexpected response to request: %#v", msg)
-	}
-}
-
-// ackRequest must be called after processing a global request that
-// has WantReply set.
-func (m *mux) ackRequest(ok bool, data []byte) error {
-	if ok {
-		return m.sendMessage(globalRequestSuccessMsg{Data: data})
-	}
-	return m.sendMessage(globalRequestFailureMsg{Data: data})
-}
-
-func (m *mux) Close() error {
-	return m.conn.Close()
-}
-
-// loop runs the connection machine. It will process packets until an
-// error is encountered. To synchronize on loop exit, use mux.Wait.
-func (m *mux) loop() {
-	var err error
-	for err == nil {
-		err = m.onePacket()
-	}
-
-	for _, ch := range m.chanList.dropAll() {
-		ch.close()
-	}
-
-	close(m.incomingChannels)
-	close(m.incomingRequests)
-	close(m.globalResponses)
-
-	m.conn.Close()
-
-	m.errCond.L.Lock()
-	m.err = err
-	m.errCond.Broadcast()
-	m.errCond.L.Unlock()
-
-	if debugMux {
-		log.Println("loop exit", err)
-	}
-}
-
-// onePacket reads and processes one packet.
-func (m *mux) onePacket() error {
-	packet, err := m.conn.readPacket()
-	if err != nil {
-		return err
-	}
-
-	if debugMux {
-		if packet[0] == msgChannelData || packet[0] == msgChannelExtendedData {
-			log.Printf("decoding(%d): data packet - %d bytes", m.chanList.offset, len(packet))
-		} else {
-			p, _ := decode(packet)
-			log.Printf("decoding(%d): %d %#v - %d bytes", m.chanList.offset, packet[0], p, len(packet))
-		}
-	}
-
-	switch packet[0] {
-	case msgChannelOpen:
-		return m.handleChannelOpen(packet)
-	case msgGlobalRequest, msgRequestSuccess, msgRequestFailure:
-		return m.handleGlobalPacket(packet)
-	}
-
-	// assume a channel packet.
-	if len(packet) < 5 {
-		return parseError(packet[0])
-	}
-	id := binary.BigEndian.Uint32(packet[1:])
-	ch := m.chanList.getChan(id)
-	if ch == nil {
-		return fmt.Errorf("ssh: invalid channel %d", id)
-	}
-
-	return ch.handlePacket(packet)
-}
-
-func (m *mux) handleGlobalPacket(packet []byte) error {
-	msg, err := decode(packet)
-	if err != nil {
-		return err
-	}
-
-	switch msg := msg.(type) {
-	case *globalRequestMsg:
-		m.incomingRequests <- &Request{
-			Type:      msg.Type,
-			WantReply: msg.WantReply,
-			Payload:   msg.Data,
-			mux:       m,
-		}
-	case *globalRequestSuccessMsg, *globalRequestFailureMsg:
-		m.globalResponses <- msg
-	default:
-		panic(fmt.Sprintf("not a global message %#v", msg))
-	}
-
-	return nil
-}
-
-// handleChannelOpen schedules a channel to be Accept()ed.
-func (m *mux) handleChannelOpen(packet []byte) error {
-	var msg channelOpenMsg
-	if err := Unmarshal(packet, &msg); err != nil {
-		return err
-	}
-
-	if msg.MaxPacketSize < minPacketLength || msg.MaxPacketSize > 1<<31 {
-		failMsg := channelOpenFailureMsg{
-			PeersId:  msg.PeersId,
-			Reason:   ConnectionFailed,
-			Message:  "invalid request",
-			Language: "en_US.UTF-8",
-		}
-		return m.sendMessage(failMsg)
-	}
-
-	c := m.newChannel(msg.ChanType, channelInbound, msg.TypeSpecificData)
-	c.remoteId = msg.PeersId
-	c.maxRemotePayload = msg.MaxPacketSize
-	c.remoteWin.add(msg.PeersWindow)
-	m.incomingChannels <- c
-	return nil
-}
-
-func (m *mux) OpenChannel(chanType string, extra []byte) (Channel, <-chan *Request, error) {
-	ch, err := m.openChannel(chanType, extra)
-	if err != nil {
-		return nil, nil, err
-	}
-
-	return ch, ch.incomingRequests, nil
-}
-
-func (m *mux) openChannel(chanType string, extra []byte) (*channel, error) {
-	ch := m.newChannel(chanType, channelOutbound, extra)
-
-	ch.maxIncomingPayload = channelMaxPacket
-
-	open := channelOpenMsg{
-		ChanType:         chanType,
-		PeersWindow:      ch.myWindow,
-		MaxPacketSize:    ch.maxIncomingPayload,
-		TypeSpecificData: extra,
-		PeersId:          ch.localId,
-	}
-	if err := m.sendMessage(open); err != nil {
-		return nil, err
-	}
-
-	switch msg := (<-ch.msg).(type) {
-	case *channelOpenConfirmMsg:
-		return ch, nil
-	case *channelOpenFailureMsg:
-		return nil, &OpenChannelError{msg.Reason, msg.Message}
-	default:
-		return nil, fmt.Errorf("ssh: unexpected packet in response to channel open: %T", msg)
-	}
-}

vendor/golang.org/x/crypto/ssh/server.go

@@ -1,563 +0,0 @@
-// Copyright 2011 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package ssh
-
-import (
-	"bytes"
-	"errors"
-	"fmt"
-	"io"
-	"net"
-	"strings"
-)
-
-// The Permissions type holds fine-grained permissions that are
-// specific to a user or a specific authentication method for a user.
-// The Permissions value for a successful authentication attempt is
-// available in ServerConn, so it can be used to pass information from
-// the user-authentication phase to the application layer.
-type Permissions struct {
-	// CriticalOptions indicate restrictions to the default
-	// permissions, and are typically used in conjunction with
-	// user certificates. The standard for SSH certificates
-	// defines "force-command" (only allow the given command to
-	// execute) and "source-address" (only allow connections from
-	// the given address). The SSH package currently only enforces
-	// the "source-address" critical option. It is up to server
-	// implementations to enforce other critical options, such as
-	// "force-command", by checking them after the SSH handshake
-	// is successful. In general, SSH servers should reject
-	// connections that specify critical options that are unknown
-	// or not supported.
-	CriticalOptions map[string]string
-
-	// Extensions are extra functionality that the server may
-	// offer on authenticated connections. Lack of support for an
-	// extension does not preclude authenticating a user. Common
-	// extensions are "permit-agent-forwarding",
-	// "permit-X11-forwarding". The Go SSH library currently does
-	// not act on any extension, and it is up to server
-	// implementations to honor them. Extensions can be used to
-	// pass data from the authentication callbacks to the server
-	// application layer.
-	Extensions map[string]string
-}
-
-// ServerConfig holds server specific configuration data.
-type ServerConfig struct {
-	// Config contains configuration shared between client and server.
-	Config
-
-	hostKeys []Signer
-
-	// NoClientAuth is true if clients are allowed to connect without
-	// authenticating.
-	NoClientAuth bool
-
-	// MaxAuthTries specifies the maximum number of authentication attempts
-	// permitted per connection. If set to a negative number, the number of
-	// attempts are unlimited. If set to zero, the number of attempts are limited
-	// to 6.
-	MaxAuthTries int
-
-	// PasswordCallback, if non-nil, is called when a user
-	// attempts to authenticate using a password.
-	PasswordCallback func(conn ConnMetadata, password []byte) (*Permissions, error)
-
-	// PublicKeyCallback, if non-nil, is called when a client
-	// offers a public key for authentication. It must return a nil error
-	// if the given public key can be used to authenticate the
-	// given user. For example, see CertChecker.Authenticate. A
-	// call to this function does not guarantee that the key
-	// offered is in fact used to authenticate. To record any data
-	// depending on the public key, store it inside a
-	// Permissions.Extensions entry.
-	PublicKeyCallback func(conn ConnMetadata, key PublicKey) (*Permissions, error)
-
-	// KeyboardInteractiveCallback, if non-nil, is called when
-	// keyboard-interactive authentication is selected (RFC
-	// 4256). The client object's Challenge function should be
-	// used to query the user. The callback may offer multiple
-	// Challenge rounds. To avoid information leaks, the client
-	// should be presented a challenge even if the user is
-	// unknown.
-	KeyboardInteractiveCallback func(conn ConnMetadata, client KeyboardInteractiveChallenge) (*Permissions, error)
-
-	// AuthLogCallback, if non-nil, is called to log all authentication
-	// attempts.
-	AuthLogCallback func(conn ConnMetadata, method string, err error)
-
-	// ServerVersion is the version identification string to announce in
-	// the public handshake.
-	// If empty, a reasonable default is used.
-	// Note that RFC 4253 section 4.2 requires that this string start with
-	// "SSH-2.0-".
-	ServerVersion string
-}
-
-// AddHostKey adds a private key as a host key. If an existing host
-// key exists with the same algorithm, it is overwritten. Each server
-// config must have at least one host key.
-func (s *ServerConfig) AddHostKey(key Signer) {
-	for i, k := range s.hostKeys {
-		if k.PublicKey().Type() == key.PublicKey().Type() {
-			s.hostKeys[i] = key
-			return
-		}
-	}
-
-	s.hostKeys = append(s.hostKeys, key)
-}
-
-// cachedPubKey contains the results of querying whether a public key is
-// acceptable for a user.
-type cachedPubKey struct {
-	user       string
-	pubKeyData []byte
-	result     error
-	perms      *Permissions
-}
-
-const maxCachedPubKeys = 16
-
-// pubKeyCache caches tests for public keys.  Since SSH clients
-// will query whether a public key is acceptable before attempting to
-// authenticate with it, we end up with duplicate queries for public
-// key validity.  The cache only applies to a single ServerConn.
-type pubKeyCache struct {
-	keys []cachedPubKey
-}
-
-// get returns the result for a given user/algo/key tuple.
-func (c *pubKeyCache) get(user string, pubKeyData []byte) (cachedPubKey, bool) {
-	for _, k := range c.keys {
-		if k.user == user && bytes.Equal(k.pubKeyData, pubKeyData) {
-			return k, true
-		}
-	}
-	return cachedPubKey{}, false
-}
-
-// add adds the given tuple to the cache.
-func (c *pubKeyCache) add(candidate cachedPubKey) {
-	if len(c.keys) < maxCachedPubKeys {
-		c.keys = append(c.keys, candidate)
-	}
-}
-
-// ServerConn is an authenticated SSH connection, as seen from the
-// server
-type ServerConn struct {
-	Conn
-
-	// If the succeeding authentication callback returned a
-	// non-nil Permissions pointer, it is stored here.
-	Permissions *Permissions
-}
-
-// NewServerConn starts a new SSH server with c as the underlying
-// transport.  It starts with a handshake and, if the handshake is
-// unsuccessful, it closes the connection and returns an error.  The
-// Request and NewChannel channels must be serviced, or the connection
-// will hang.
-func NewServerConn(c net.Conn, config *ServerConfig) (*ServerConn, <-chan NewChannel, <-chan *Request, error) {
-	fullConf := *config
-	fullConf.SetDefaults()
-	if fullConf.MaxAuthTries == 0 {
-		fullConf.MaxAuthTries = 6
-	}
-
-	s := &connection{
-		sshConn: sshConn{conn: c},
-	}
-	perms, err := s.serverHandshake(&fullConf)
-	if err != nil {
-		c.Close()
-		return nil, nil, nil, err
-	}
-	return &ServerConn{s, perms}, s.mux.incomingChannels, s.mux.incomingRequests, nil
-}
-
-// signAndMarshal signs the data with the appropriate algorithm,
-// and serializes the result in SSH wire format.
-func signAndMarshal(k Signer, rand io.Reader, data []byte) ([]byte, error) {
-	sig, err := k.Sign(rand, data)
-	if err != nil {
-		return nil, err
-	}
-
-	return Marshal(sig), nil
-}
-
-// handshake performs key exchange and user authentication.
-func (s *connection) serverHandshake(config *ServerConfig) (*Permissions, error) {
-	if len(config.hostKeys) == 0 {
-		return nil, errors.New("ssh: server has no host keys")
-	}
-
-	if !config.NoClientAuth && config.PasswordCallback == nil && config.PublicKeyCallback == nil && config.KeyboardInteractiveCallback == nil {
-		return nil, errors.New("ssh: no authentication methods configured but NoClientAuth is also false")
-	}
-
-	if config.ServerVersion != "" {
-		s.serverVersion = []byte(config.ServerVersion)
-	} else {
-		s.serverVersion = []byte(packageVersion)
-	}
-	var err error
-	s.clientVersion, err = exchangeVersions(s.sshConn.conn, s.serverVersion)
-	if err != nil {
-		return nil, err
-	}
-
-	tr := newTransport(s.sshConn.conn, config.Rand, false /* not client */)
-	s.transport = newServerTransport(tr, s.clientVersion, s.serverVersion, config)
-
-	if err := s.transport.waitSession(); err != nil {
-		return nil, err
-	}
-
-	// We just did the key change, so the session ID is established.
-	s.sessionID = s.transport.getSessionID()
-
-	var packet []byte
-	if packet, err = s.transport.readPacket(); err != nil {
-		return nil, err
-	}
-
-	var serviceRequest serviceRequestMsg
-	if err = Unmarshal(packet, &serviceRequest); err != nil {
-		return nil, err
-	}
-	if serviceRequest.Service != serviceUserAuth {
-		return nil, errors.New("ssh: requested service '" + serviceRequest.Service + "' before authenticating")
-	}
-	serviceAccept := serviceAcceptMsg{
-		Service: serviceUserAuth,
-	}
-	if err := s.transport.writePacket(Marshal(&serviceAccept)); err != nil {
-		return nil, err
-	}
-
-	perms, err := s.serverAuthenticate(config)
-	if err != nil {
-		return nil, err
-	}
-	s.mux = newMux(s.transport)
-	return perms, err
-}
-
-func isAcceptableAlgo(algo string) bool {
-	switch algo {
-	case KeyAlgoRSA, KeyAlgoDSA, KeyAlgoECDSA256, KeyAlgoECDSA384, KeyAlgoECDSA521, KeyAlgoED25519,
-		CertAlgoRSAv01, CertAlgoDSAv01, CertAlgoECDSA256v01, CertAlgoECDSA384v01, CertAlgoECDSA521v01:
-		return true
-	}
-	return false
-}
-
-func checkSourceAddress(addr net.Addr, sourceAddrs string) error {
-	if addr == nil {
-		return errors.New("ssh: no address known for client, but source-address match required")
-	}
-
-	tcpAddr, ok := addr.(*net.TCPAddr)
-	if !ok {
-		return fmt.Errorf("ssh: remote address %v is not an TCP address when checking source-address match", addr)
-	}
-
-	for _, sourceAddr := range strings.Split(sourceAddrs, ",") {
-		if allowedIP := net.ParseIP(sourceAddr); allowedIP != nil {
-			if allowedIP.Equal(tcpAddr.IP) {
-				return nil
-			}
-		} else {
-			_, ipNet, err := net.ParseCIDR(sourceAddr)
-			if err != nil {
-				return fmt.Errorf("ssh: error parsing source-address restriction %q: %v", sourceAddr, err)
-			}
-
-			if ipNet.Contains(tcpAddr.IP) {
-				return nil
-			}
-		}
-	}
-
-	return fmt.Errorf("ssh: remote address %v is not allowed because of source-address restriction", addr)
-}
-
-// ServerAuthError implements the error interface. It appends any authentication
-// errors that may occur, and is returned if all of the authentication methods
-// provided by the user failed to authenticate.
-type ServerAuthError struct {
-	// Errors contains authentication errors returned by the authentication
-	// callback methods.
-	Errors []error
-}
-
-func (l ServerAuthError) Error() string {
-	var errs []string
-	for _, err := range l.Errors {
-		errs = append(errs, err.Error())
-	}
-	return "[" + strings.Join(errs, ", ") + "]"
-}
-
-func (s *connection) serverAuthenticate(config *ServerConfig) (*Permissions, error) {
-	sessionID := s.transport.getSessionID()
-	var cache pubKeyCache
-	var perms *Permissions
-
-	authFailures := 0
-	var authErrs []error
-
-userAuthLoop:
-	for {
-		if authFailures >= config.MaxAuthTries && config.MaxAuthTries > 0 {
-			discMsg := &disconnectMsg{
-				Reason:  2,
-				Message: "too many authentication failures",
-			}
-
-			if err := s.transport.writePacket(Marshal(discMsg)); err != nil {
-				return nil, err
-			}
-
-			return nil, discMsg
-		}
-
-		var userAuthReq userAuthRequestMsg
-		if packet, err := s.transport.readPacket(); err != nil {
-			if err == io.EOF {
-				return nil, &ServerAuthError{Errors: authErrs}
-			}
-			return nil, err
-		} else if err = Unmarshal(packet, &userAuthReq); err != nil {
-			return nil, err
-		}
-
-		if userAuthReq.Service != serviceSSH {
-			return nil, errors.New("ssh: client attempted to negotiate for unknown service: " + userAuthReq.Service)
-		}
-
-		s.user = userAuthReq.User
-		perms = nil
-		authErr := errors.New("no auth passed yet")
-
-		switch userAuthReq.Method {
-		case "none":
-			if config.NoClientAuth {
-				authErr = nil
-			}
-
-			// allow initial attempt of 'none' without penalty
-			if authFailures == 0 {
-				authFailures--
-			}
-		case "password":
-			if config.PasswordCallback == nil {
-				authErr = errors.New("ssh: password auth not configured")
-				break
-			}
-			payload := userAuthReq.Payload
-			if len(payload) < 1 || payload[0] != 0 {
-				return nil, parseError(msgUserAuthRequest)
-			}
-			payload = payload[1:]
-			password, payload, ok := parseString(payload)
-			if !ok || len(payload) > 0 {
-				return nil, parseError(msgUserAuthRequest)
-			}
-
-			perms, authErr = config.PasswordCallback(s, password)
-		case "keyboard-interactive":
-			if config.KeyboardInteractiveCallback == nil {
-				authErr = errors.New("ssh: keyboard-interactive auth not configubred")
-				break
-			}
-
-			prompter := &sshClientKeyboardInteractive{s}
-			perms, authErr = config.KeyboardInteractiveCallback(s, prompter.Challenge)
-		case "publickey":
-			if config.PublicKeyCallback == nil {
-				authErr = errors.New("ssh: publickey auth not configured")
-				break
-			}
-			payload := userAuthReq.Payload
-			if len(payload) < 1 {
-				return nil, parseError(msgUserAuthRequest)
-			}
-			isQuery := payload[0] == 0
-			payload = payload[1:]
-			algoBytes, payload, ok := parseString(payload)
-			if !ok {
-				return nil, parseError(msgUserAuthRequest)
-			}
-			algo := string(algoBytes)
-			if !isAcceptableAlgo(algo) {
-				authErr = fmt.Errorf("ssh: algorithm %q not accepted", algo)
-				break
-			}
-
-			pubKeyData, payload, ok := parseString(payload)
-			if !ok {
-				return nil, parseError(msgUserAuthRequest)
-			}
-
-			pubKey, err := ParsePublicKey(pubKeyData)
-			if err != nil {
-				return nil, err
-			}
-
-			candidate, ok := cache.get(s.user, pubKeyData)
-			if !ok {
-				candidate.user = s.user
-				candidate.pubKeyData = pubKeyData
-				candidate.perms, candidate.result = config.PublicKeyCallback(s, pubKey)
-				if candidate.result == nil && candidate.perms != nil && candidate.perms.CriticalOptions != nil && candidate.perms.CriticalOptions[sourceAddressCriticalOption] != "" {
-					candidate.result = checkSourceAddress(
-						s.RemoteAddr(),
-						candidate.perms.CriticalOptions[sourceAddressCriticalOption])
-				}
-				cache.add(candidate)
-			}
-
-			if isQuery {
-				// The client can query if the given public key
-				// would be okay.
-
-				if len(payload) > 0 {
-					return nil, parseError(msgUserAuthRequest)
-				}
-
-				if candidate.result == nil {
-					okMsg := userAuthPubKeyOkMsg{
-						Algo:   algo,
-						PubKey: pubKeyData,
-					}
-					if err = s.transport.writePacket(Marshal(&okMsg)); err != nil {
-						return nil, err
-					}
-					continue userAuthLoop
-				}
-				authErr = candidate.result
-			} else {
-				sig, payload, ok := parseSignature(payload)
-				if !ok || len(payload) > 0 {
-					return nil, parseError(msgUserAuthRequest)
-				}
-				// Ensure the public key algo and signature algo
-				// are supported.  Compare the private key
-				// algorithm name that corresponds to algo with
-				// sig.Format.  This is usually the same, but
-				// for certs, the names differ.
-				if !isAcceptableAlgo(sig.Format) {
-					break
-				}
-				signedData := buildDataSignedForAuth(sessionID, userAuthReq, algoBytes, pubKeyData)
-
-				if err := pubKey.Verify(signedData, sig); err != nil {
-					return nil, err
-				}
-
-				authErr = candidate.result
-				perms = candidate.perms
-			}
-		default:
-			authErr = fmt.Errorf("ssh: unknown method %q", userAuthReq.Method)
-		}
-
-		authErrs = append(authErrs, authErr)
-
-		if config.AuthLogCallback != nil {
-			config.AuthLogCallback(s, userAuthReq.Method, authErr)
-		}
-
-		if authErr == nil {
-			break userAuthLoop
-		}
-
-		authFailures++
-
-		var failureMsg userAuthFailureMsg
-		if config.PasswordCallback != nil {
-			failureMsg.Methods = append(failureMsg.Methods, "password")
-		}
-		if config.PublicKeyCallback != nil {
-			failureMsg.Methods = append(failureMsg.Methods, "publickey")
-		}
-		if config.KeyboardInteractiveCallback != nil {
-			failureMsg.Methods = append(failureMsg.Methods, "keyboard-interactive")
-		}
-
-		if len(failureMsg.Methods) == 0 {
-			return nil, errors.New("ssh: no authentication methods configured but NoClientAuth is also false")
-		}
-
-		if err := s.transport.writePacket(Marshal(&failureMsg)); err != nil {
-			return nil, err
-		}
-	}
-
-	if err := s.transport.writePacket([]byte{msgUserAuthSuccess}); err != nil {
-		return nil, err
-	}
-	return perms, nil
-}
-
-// sshClientKeyboardInteractive implements a ClientKeyboardInteractive by
-// asking the client on the other side of a ServerConn.
-type sshClientKeyboardInteractive struct {
-	*connection
-}
-
-func (c *sshClientKeyboardInteractive) Challenge(user, instruction string, questions []string, echos []bool) (answers []string, err error) {
-	if len(questions) != len(echos) {
-		return nil, errors.New("ssh: echos and questions must have equal length")
-	}
-
-	var prompts []byte
-	for i := range questions {
-		prompts = appendString(prompts, questions[i])
-		prompts = appendBool(prompts, echos[i])
-	}
-
-	if err := c.transport.writePacket(Marshal(&userAuthInfoRequestMsg{
-		Instruction: instruction,
-		NumPrompts:  uint32(len(questions)),
-		Prompts:     prompts,
-	})); err != nil {
-		return nil, err
-	}
-
-	packet, err := c.transport.readPacket()
-	if err != nil {
-		return nil, err
-	}
-	if packet[0] != msgUserAuthInfoResponse {
-		return nil, unexpectedMessageError(msgUserAuthInfoResponse, packet[0])
-	}
-	packet = packet[1:]
-
-	n, packet, ok := parseUint32(packet)
-	if !ok || int(n) != len(questions) {
-		return nil, parseError(msgUserAuthInfoResponse)
-	}
-
-	for i := uint32(0); i < n; i++ {
-		ans, rest, ok := parseString(packet)
-		if !ok {
-			return nil, parseError(msgUserAuthInfoResponse)
-		}
-
-		answers = append(answers, string(ans))
-		packet = rest
-	}
-	if len(packet) != 0 {
-		return nil, errors.New("ssh: junk at end of message")
-	}
-
-	return answers, nil
-}

vendor/golang.org/x/crypto/ssh/session.go

@@ -1,647 +0,0 @@
-// Copyright 2011 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package ssh
-
-// Session implements an interactive session described in
-// "RFC 4254, section 6".
-
-import (
-	"bytes"
-	"encoding/binary"
-	"errors"
-	"fmt"
-	"io"
-	"io/ioutil"
-	"sync"
-)
-
-type Signal string
-
-// POSIX signals as listed in RFC 4254 Section 6.10.
-const (
-	SIGABRT Signal = "ABRT"
-	SIGALRM Signal = "ALRM"
-	SIGFPE  Signal = "FPE"
-	SIGHUP  Signal = "HUP"
-	SIGILL  Signal = "ILL"
-	SIGINT  Signal = "INT"
-	SIGKILL Signal = "KILL"
-	SIGPIPE Signal = "PIPE"
-	SIGQUIT Signal = "QUIT"
-	SIGSEGV Signal = "SEGV"
-	SIGTERM Signal = "TERM"
-	SIGUSR1 Signal = "USR1"
-	SIGUSR2 Signal = "USR2"
-)
-
-var signals = map[Signal]int{
-	SIGABRT: 6,
-	SIGALRM: 14,
-	SIGFPE:  8,
-	SIGHUP:  1,
-	SIGILL:  4,
-	SIGINT:  2,
-	SIGKILL: 9,
-	SIGPIPE: 13,
-	SIGQUIT: 3,
-	SIGSEGV: 11,
-	SIGTERM: 15,
-}
-
-type TerminalModes map[uint8]uint32
-
-// POSIX terminal mode flags as listed in RFC 4254 Section 8.
-const (
-	tty_OP_END    = 0
-	VINTR         = 1
-	VQUIT         = 2
-	VERASE        = 3
-	VKILL         = 4
-	VEOF          = 5
-	VEOL          = 6
-	VEOL2         = 7
-	VSTART        = 8
-	VSTOP         = 9
-	VSUSP         = 10
-	VDSUSP        = 11
-	VREPRINT      = 12
-	VWERASE       = 13
-	VLNEXT        = 14
-	VFLUSH        = 15
-	VSWTCH        = 16
-	VSTATUS       = 17
-	VDISCARD      = 18
-	IGNPAR        = 30
-	PARMRK        = 31
-	INPCK         = 32
-	ISTRIP        = 33
-	INLCR         = 34
-	IGNCR         = 35
-	ICRNL         = 36
-	IUCLC         = 37
-	IXON          = 38
-	IXANY         = 39
-	IXOFF         = 40
-	IMAXBEL       = 41
-	ISIG          = 50
-	ICANON        = 51
-	XCASE         = 52
-	ECHO          = 53
-	ECHOE         = 54
-	ECHOK         = 55
-	ECHONL        = 56
-	NOFLSH        = 57
-	TOSTOP        = 58
-	IEXTEN        = 59
-	ECHOCTL       = 60
-	ECHOKE        = 61
-	PENDIN        = 62
-	OPOST         = 70
-	OLCUC         = 71
-	ONLCR         = 72
-	OCRNL         = 73
-	ONOCR         = 74
-	ONLRET        = 75
-	CS7           = 90
-	CS8           = 91
-	PARENB        = 92
-	PARODD        = 93
-	TTY_OP_ISPEED = 128
-	TTY_OP_OSPEED = 129
-)
-
-// A Session represents a connection to a remote command or shell.
-type Session struct {
-	// Stdin specifies the remote process's standard input.
-	// If Stdin is nil, the remote process reads from an empty
-	// bytes.Buffer.
-	Stdin io.Reader
-
-	// Stdout and Stderr specify the remote process's standard
-	// output and error.
-	//
-	// If either is nil, Run connects the corresponding file
-	// descriptor to an instance of ioutil.Discard. There is a
-	// fixed amount of buffering that is shared for the two streams.
-	// If either blocks it may eventually cause the remote
-	// command to block.
-	Stdout io.Writer
-	Stderr io.Writer
-
-	ch        Channel // the channel backing this session
-	started   bool    // true once Start, Run or Shell is invoked.
-	copyFuncs []func() error
-	errors    chan error // one send per copyFunc
-
-	// true if pipe method is active
-	stdinpipe, stdoutpipe, stderrpipe bool
-
-	// stdinPipeWriter is non-nil if StdinPipe has not been called
-	// and Stdin was specified by the user; it is the write end of
-	// a pipe connecting Session.Stdin to the stdin channel.
-	stdinPipeWriter io.WriteCloser
-
-	exitStatus chan error
-}
-
-// SendRequest sends an out-of-band channel request on the SSH channel
-// underlying the session.
-func (s *Session) SendRequest(name string, wantReply bool, payload []byte) (bool, error) {
-	return s.ch.SendRequest(name, wantReply, payload)
-}
-
-func (s *Session) Close() error {
-	return s.ch.Close()
-}
-
-// RFC 4254 Section 6.4.
-type setenvRequest struct {
-	Name  string
-	Value string
-}
-
-// Setenv sets an environment variable that will be applied to any
-// command executed by Shell or Run.
-func (s *Session) Setenv(name, value string) error {
-	msg := setenvRequest{
-		Name:  name,
-		Value: value,
-	}
-	ok, err := s.ch.SendRequest("env", true, Marshal(&msg))
-	if err == nil && !ok {
-		err = errors.New("ssh: setenv failed")
-	}
-	return err
-}
-
-// RFC 4254 Section 6.2.
-type ptyRequestMsg struct {
-	Term     string
-	Columns  uint32
-	Rows     uint32
-	Width    uint32
-	Height   uint32
-	Modelist string
-}
-
-// RequestPty requests the association of a pty with the session on the remote host.
-func (s *Session) RequestPty(term string, h, w int, termmodes TerminalModes) error {
-	var tm []byte
-	for k, v := range termmodes {
-		kv := struct {
-			Key byte
-			Val uint32
-		}{k, v}
-
-		tm = append(tm, Marshal(&kv)...)
-	}
-	tm = append(tm, tty_OP_END)
-	req := ptyRequestMsg{
-		Term:     term,
-		Columns:  uint32(w),
-		Rows:     uint32(h),
-		Width:    uint32(w * 8),
-		Height:   uint32(h * 8),
-		Modelist: string(tm),
-	}
-	ok, err := s.ch.SendRequest("pty-req", true, Marshal(&req))
-	if err == nil && !ok {
-		err = errors.New("ssh: pty-req failed")
-	}
-	return err
-}
-
-// RFC 4254 Section 6.5.
-type subsystemRequestMsg struct {
-	Subsystem string
-}
-
-// RequestSubsystem requests the association of a subsystem with the session on the remote host.
-// A subsystem is a predefined command that runs in the background when the ssh session is initiated
-func (s *Session) RequestSubsystem(subsystem string) error {
-	msg := subsystemRequestMsg{
-		Subsystem: subsystem,
-	}
-	ok, err := s.ch.SendRequest("subsystem", true, Marshal(&msg))
-	if err == nil && !ok {
-		err = errors.New("ssh: subsystem request failed")
-	}
-	return err
-}
-
-// RFC 4254 Section 6.7.
-type ptyWindowChangeMsg struct {
-	Columns uint32
-	Rows    uint32
-	Width   uint32
-	Height  uint32
-}
-
-// WindowChange informs the remote host about a terminal window dimension change to h rows and w columns.
-func (s *Session) WindowChange(h, w int) error {
-	req := ptyWindowChangeMsg{
-		Columns: uint32(w),
-		Rows:    uint32(h),
-		Width:   uint32(w * 8),
-		Height:  uint32(h * 8),
-	}
-	_, err := s.ch.SendRequest("window-change", false, Marshal(&req))
-	return err
-}
-
-// RFC 4254 Section 6.9.
-type signalMsg struct {
-	Signal string
-}
-
-// Signal sends the given signal to the remote process.
-// sig is one of the SIG* constants.
-func (s *Session) Signal(sig Signal) error {
-	msg := signalMsg{
-		Signal: string(sig),
-	}
-
-	_, err := s.ch.SendRequest("signal", false, Marshal(&msg))
-	return err
-}
-
-// RFC 4254 Section 6.5.
-type execMsg struct {
-	Command string
-}
-
-// Start runs cmd on the remote host. Typically, the remote
-// server passes cmd to the shell for interpretation.
-// A Session only accepts one call to Run, Start or Shell.
-func (s *Session) Start(cmd string) error {
-	if s.started {
-		return errors.New("ssh: session already started")
-	}
-	req := execMsg{
-		Command: cmd,
-	}
-
-	ok, err := s.ch.SendRequest("exec", true, Marshal(&req))
-	if err == nil && !ok {
-		err = fmt.Errorf("ssh: command %v failed", cmd)
-	}
-	if err != nil {
-		return err
-	}
-	return s.start()
-}
-
-// Run runs cmd on the remote host. Typically, the remote
-// server passes cmd to the shell for interpretation.
-// A Session only accepts one call to Run, Start, Shell, Output,
-// or CombinedOutput.
-//
-// The returned error is nil if the command runs, has no problems
-// copying stdin, stdout, and stderr, and exits with a zero exit
-// status.
-//
-// If the remote server does not send an exit status, an error of type
-// *ExitMissingError is returned. If the command completes
-// unsuccessfully or is interrupted by a signal, the error is of type
-// *ExitError. Other error types may be returned for I/O problems.
-func (s *Session) Run(cmd string) error {
-	err := s.Start(cmd)
-	if err != nil {
-		return err
-	}
-	return s.Wait()
-}
-
-// Output runs cmd on the remote host and returns its standard output.
-func (s *Session) Output(cmd string) ([]byte, error) {
-	if s.Stdout != nil {
-		return nil, errors.New("ssh: Stdout already set")
-	}
-	var b bytes.Buffer
-	s.Stdout = &b
-	err := s.Run(cmd)
-	return b.Bytes(), err
-}
-
-type singleWriter struct {
-	b  bytes.Buffer
-	mu sync.Mutex
-}
-
-func (w *singleWriter) Write(p []byte) (int, error) {
-	w.mu.Lock()
-	defer w.mu.Unlock()
-	return w.b.Write(p)
-}
-
-// CombinedOutput runs cmd on the remote host and returns its combined
-// standard output and standard error.
-func (s *Session) CombinedOutput(cmd string) ([]byte, error) {
-	if s.Stdout != nil {
-		return nil, errors.New("ssh: Stdout already set")
-	}
-	if s.Stderr != nil {
-		return nil, errors.New("ssh: Stderr already set")
-	}
-	var b singleWriter
-	s.Stdout = &b
-	s.Stderr = &b
-	err := s.Run(cmd)
-	return b.b.Bytes(), err
-}
-
-// Shell starts a login shell on the remote host. A Session only
-// accepts one call to Run, Start, Shell, Output, or CombinedOutput.
-func (s *Session) Shell() error {
-	if s.started {
-		return errors.New("ssh: session already started")
-	}
-
-	ok, err := s.ch.SendRequest("shell", true, nil)
-	if err == nil && !ok {
-		return errors.New("ssh: could not start shell")
-	}
-	if err != nil {
-		return err
-	}
-	return s.start()
-}
-
-func (s *Session) start() error {
-	s.started = true
-
-	type F func(*Session)
-	for _, setupFd := range []F{(*Session).stdin, (*Session).stdout, (*Session).stderr} {
-		setupFd(s)
-	}
-
-	s.errors = make(chan error, len(s.copyFuncs))
-	for _, fn := range s.copyFuncs {
-		go func(fn func() error) {
-			s.errors <- fn()
-		}(fn)
-	}
-	return nil
-}
-
-// Wait waits for the remote command to exit.
-//
-// The returned error is nil if the command runs, has no problems
-// copying stdin, stdout, and stderr, and exits with a zero exit
-// status.
-//
-// If the remote server does not send an exit status, an error of type
-// *ExitMissingError is returned. If the command completes
-// unsuccessfully or is interrupted by a signal, the error is of type
-// *ExitError. Other error types may be returned for I/O problems.
-func (s *Session) Wait() error {
-	if !s.started {
-		return errors.New("ssh: session not started")
-	}
-	waitErr := <-s.exitStatus
-
-	if s.stdinPipeWriter != nil {
-		s.stdinPipeWriter.Close()
-	}
-	var copyError error
-	for _ = range s.copyFuncs {
-		if err := <-s.errors; err != nil && copyError == nil {
-			copyError = err
-		}
-	}
-	if waitErr != nil {
-		return waitErr
-	}
-	return copyError
-}
-
-func (s *Session) wait(reqs <-chan *Request) error {
-	wm := Waitmsg{status: -1}
-	// Wait for msg channel to be closed before returning.
-	for msg := range reqs {
-		switch msg.Type {
-		case "exit-status":
-			wm.status = int(binary.BigEndian.Uint32(msg.Payload))
-		case "exit-signal":
-			var sigval struct {
-				Signal     string
-				CoreDumped bool
-				Error      string
-				Lang       string
-			}
-			if err := Unmarshal(msg.Payload, &sigval); err != nil {
-				return err
-			}
-
-			// Must sanitize strings?
-			wm.signal = sigval.Signal
-			wm.msg = sigval.Error
-			wm.lang = sigval.Lang
-		default:
-			// This handles keepalives and matches
-			// OpenSSH's behaviour.
-			if msg.WantReply {
-				msg.Reply(false, nil)
-			}
-		}
-	}
-	if wm.status == 0 {
-		return nil
-	}
-	if wm.status == -1 {
-		// exit-status was never sent from server
-		if wm.signal == "" {
-			// signal was not sent either.  RFC 4254
-			// section 6.10 recommends against this
-			// behavior, but it is allowed, so we let
-			// clients handle it.
-			return &ExitMissingError{}
-		}
-		wm.status = 128
-		if _, ok := signals[Signal(wm.signal)]; ok {
-			wm.status += signals[Signal(wm.signal)]
-		}
-	}
-
-	return &ExitError{wm}
-}
-
-// ExitMissingError is returned if a session is torn down cleanly, but
-// the server sends no confirmation of the exit status.
-type ExitMissingError struct{}
-
-func (e *ExitMissingError) Error() string {
-	return "wait: remote command exited without exit status or exit signal"
-}
-
-func (s *Session) stdin() {
-	if s.stdinpipe {
-		return
-	}
-	var stdin io.Reader
-	if s.Stdin == nil {
-		stdin = new(bytes.Buffer)
-	} else {
-		r, w := io.Pipe()
-		go func() {
-			_, err := io.Copy(w, s.Stdin)
-			w.CloseWithError(err)
-		}()
-		stdin, s.stdinPipeWriter = r, w
-	}
-	s.copyFuncs = append(s.copyFuncs, func() error {
-		_, err := io.Copy(s.ch, stdin)
-		if err1 := s.ch.CloseWrite(); err == nil && err1 != io.EOF {
-			err = err1
-		}
-		return err
-	})
-}
-
-func (s *Session) stdout() {
-	if s.stdoutpipe {
-		return
-	}
-	if s.Stdout == nil {
-		s.Stdout = ioutil.Discard
-	}
-	s.copyFuncs = append(s.copyFuncs, func() error {
-		_, err := io.Copy(s.Stdout, s.ch)
-		return err
-	})
-}
-
-func (s *Session) stderr() {
-	if s.stderrpipe {
-		return
-	}
-	if s.Stderr == nil {
-		s.Stderr = ioutil.Discard
-	}
-	s.copyFuncs = append(s.copyFuncs, func() error {
-		_, err := io.Copy(s.Stderr, s.ch.Stderr())
-		return err
-	})
-}
-
-// sessionStdin reroutes Close to CloseWrite.
-type sessionStdin struct {
-	io.Writer
-	ch Channel
-}
-
-func (s *sessionStdin) Close() error {
-	return s.ch.CloseWrite()
-}
-
-// StdinPipe returns a pipe that will be connected to the
-// remote command's standard input when the command starts.
-func (s *Session) StdinPipe() (io.WriteCloser, error) {
-	if s.Stdin != nil {
-		return nil, errors.New("ssh: Stdin already set")
-	}
-	if s.started {
-		return nil, errors.New("ssh: StdinPipe after process started")
-	}
-	s.stdinpipe = true
-	return &sessionStdin{s.ch, s.ch}, nil
-}
-
-// StdoutPipe returns a pipe that will be connected to the
-// remote command's standard output when the command starts.
-// There is a fixed amount of buffering that is shared between
-// stdout and stderr streams. If the StdoutPipe reader is
-// not serviced fast enough it may eventually cause the
-// remote command to block.
-func (s *Session) StdoutPipe() (io.Reader, error) {
-	if s.Stdout != nil {
-		return nil, errors.New("ssh: Stdout already set")
-	}
-	if s.started {
-		return nil, errors.New("ssh: StdoutPipe after process started")
-	}
-	s.stdoutpipe = true
-	return s.ch, nil
-}
-
-// StderrPipe returns a pipe that will be connected to the
-// remote command's standard error when the command starts.
-// There is a fixed amount of buffering that is shared between
-// stdout and stderr streams. If the StderrPipe reader is
-// not serviced fast enough it may eventually cause the
-// remote command to block.
-func (s *Session) StderrPipe() (io.Reader, error) {
-	if s.Stderr != nil {
-		return nil, errors.New("ssh: Stderr already set")
-	}
-	if s.started {
-		return nil, errors.New("ssh: StderrPipe after process started")
-	}
-	s.stderrpipe = true
-	return s.ch.Stderr(), nil
-}
-
-// newSession returns a new interactive session on the remote host.
-func newSession(ch Channel, reqs <-chan *Request) (*Session, error) {
-	s := &Session{
-		ch: ch,
-	}
-	s.exitStatus = make(chan error, 1)
-	go func() {
-		s.exitStatus <- s.wait(reqs)
-	}()
-
-	return s, nil
-}
-
-// An ExitError reports unsuccessful completion of a remote command.
-type ExitError struct {
-	Waitmsg
-}
-
-func (e *ExitError) Error() string {
-	return e.Waitmsg.String()
-}
-
-// Waitmsg stores the information about an exited remote command
-// as reported by Wait.
-type Waitmsg struct {
-	status int
-	signal string
-	msg    string
-	lang   string
-}
-
-// ExitStatus returns the exit status of the remote command.
-func (w Waitmsg) ExitStatus() int {
-	return w.status
-}
-
-// Signal returns the exit signal of the remote command if
-// it was terminated violently.
-func (w Waitmsg) Signal() string {
-	return w.signal
-}
-
-// Msg returns the exit message given by the remote command
-func (w Waitmsg) Msg() string {
-	return w.msg
-}
-
-// Lang returns the language tag. See RFC 3066
-func (w Waitmsg) Lang() string {
-	return w.lang
-}
-
-func (w Waitmsg) String() string {
-	str := fmt.Sprintf("Process exited with status %v", w.status)
-	if w.signal != "" {
-		str += fmt.Sprintf(" from signal %v", w.signal)
-	}
-	if w.msg != "" {
-		str += fmt.Sprintf(". Reason was: %v", w.msg)
-	}
-	return str
-}

vendor/golang.org/x/crypto/ssh/streamlocal.go

@@ -1,115 +0,0 @@
-package ssh
-
-import (
-	"errors"
-	"io"
-	"net"
-)
-
-// streamLocalChannelOpenDirectMsg is a struct used for SSH_MSG_CHANNEL_OPEN message
-// with "direct-streamlocal@openssh.com" string.
-//
-// See openssh-portable/PROTOCOL, section 2.4. connection: Unix domain socket forwarding
-// https://github.com/openssh/openssh-portable/blob/master/PROTOCOL#L235
-type streamLocalChannelOpenDirectMsg struct {
-	socketPath string
-	reserved0  string
-	reserved1  uint32
-}
-
-// forwardedStreamLocalPayload is a struct used for SSH_MSG_CHANNEL_OPEN message
-// with "forwarded-streamlocal@openssh.com" string.
-type forwardedStreamLocalPayload struct {
-	SocketPath string
-	Reserved0  string
-}
-
-// streamLocalChannelForwardMsg is a struct used for SSH2_MSG_GLOBAL_REQUEST message
-// with "streamlocal-forward@openssh.com"/"cancel-streamlocal-forward@openssh.com" string.
-type streamLocalChannelForwardMsg struct {
-	socketPath string
-}
-
-// ListenUnix is similar to ListenTCP but uses a Unix domain socket.
-func (c *Client) ListenUnix(socketPath string) (net.Listener, error) {
-	m := streamLocalChannelForwardMsg{
-		socketPath,
-	}
-	// send message
-	ok, _, err := c.SendRequest("streamlocal-forward@openssh.com", true, Marshal(&m))
-	if err != nil {
-		return nil, err
-	}
-	if !ok {
-		return nil, errors.New("ssh: streamlocal-forward@openssh.com request denied by peer")
-	}
-	ch := c.forwards.add(&net.UnixAddr{Name: socketPath, Net: "unix"})
-
-	return &unixListener{socketPath, c, ch}, nil
-}
-
-func (c *Client) dialStreamLocal(socketPath string) (Channel, error) {
-	msg := streamLocalChannelOpenDirectMsg{
-		socketPath: socketPath,
-	}
-	ch, in, err := c.OpenChannel("direct-streamlocal@openssh.com", Marshal(&msg))
-	if err != nil {
-		return nil, err
-	}
-	go DiscardRequests(in)
-	return ch, err
-}
-
-type unixListener struct {
-	socketPath string
-
-	conn *Client
-	in   <-chan forward
-}
-
-// Accept waits for and returns the next connection to the listener.
-func (l *unixListener) Accept() (net.Conn, error) {
-	s, ok := <-l.in
-	if !ok {
-		return nil, io.EOF
-	}
-	ch, incoming, err := s.newCh.Accept()
-	if err != nil {
-		return nil, err
-	}
-	go DiscardRequests(incoming)
-
-	return &chanConn{
-		Channel: ch,
-		laddr: &net.UnixAddr{
-			Name: l.socketPath,
-			Net:  "unix",
-		},
-		raddr: &net.UnixAddr{
-			Name: "@",
-			Net:  "unix",
-		},
-	}, nil
-}
-
-// Close closes the listener.
-func (l *unixListener) Close() error {
-	// this also closes the listener.
-	l.conn.forwards.remove(&net.UnixAddr{Name: l.socketPath, Net: "unix"})
-	m := streamLocalChannelForwardMsg{
-		l.socketPath,
-	}
-	ok, _, err := l.conn.SendRequest("cancel-streamlocal-forward@openssh.com", true, Marshal(&m))
-	if err == nil && !ok {
-		err = errors.New("ssh: cancel-streamlocal-forward@openssh.com failed")
-	}
-	return err
-}
-
-// Addr returns the listener's network address.
-func (l *unixListener) Addr() net.Addr {
-	return &net.UnixAddr{
-		Name: l.socketPath,
-		Net:  "unix",
-	}
-}

vendor/golang.org/x/crypto/ssh/tcpip.go

@@ -1,465 +0,0 @@
-// Copyright 2011 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package ssh
-
-import (
-	"errors"
-	"fmt"
-	"io"
-	"math/rand"
-	"net"
-	"strconv"
-	"strings"
-	"sync"
-	"time"
-)
-
-// Listen requests the remote peer open a listening socket on
-// addr. Incoming connections will be available by calling Accept on
-// the returned net.Listener. The listener must be serviced, or the
-// SSH connection may hang.
-// N must be "tcp", "tcp4", "tcp6", or "unix".
-func (c *Client) Listen(n, addr string) (net.Listener, error) {
-	switch n {
-	case "tcp", "tcp4", "tcp6":
-		laddr, err := net.ResolveTCPAddr(n, addr)
-		if err != nil {
-			return nil, err
-		}
-		return c.ListenTCP(laddr)
-	case "unix":
-		return c.ListenUnix(addr)
-	default:
-		return nil, fmt.Errorf("ssh: unsupported protocol: %s", n)
-	}
-}
-
-// Automatic port allocation is broken with OpenSSH before 6.0. See
-// also https://bugzilla.mindrot.org/show_bug.cgi?id=2017.  In
-// particular, OpenSSH 5.9 sends a channelOpenMsg with port number 0,
-// rather than the actual port number. This means you can never open
-// two different listeners with auto allocated ports. We work around
-// this by trying explicit ports until we succeed.
-
-const openSSHPrefix = "OpenSSH_"
-
-var portRandomizer = rand.New(rand.NewSource(time.Now().UnixNano()))
-
-// isBrokenOpenSSHVersion returns true if the given version string
-// specifies a version of OpenSSH that is known to have a bug in port
-// forwarding.
-func isBrokenOpenSSHVersion(versionStr string) bool {
-	i := strings.Index(versionStr, openSSHPrefix)
-	if i < 0 {
-		return false
-	}
-	i += len(openSSHPrefix)
-	j := i
-	for ; j < len(versionStr); j++ {
-		if versionStr[j] < '0' || versionStr[j] > '9' {
-			break
-		}
-	}
-	version, _ := strconv.Atoi(versionStr[i:j])
-	return version < 6
-}
-
-// autoPortListenWorkaround simulates automatic port allocation by
-// trying random ports repeatedly.
-func (c *Client) autoPortListenWorkaround(laddr *net.TCPAddr) (net.Listener, error) {
-	var sshListener net.Listener
-	var err error
-	const tries = 10
-	for i := 0; i < tries; i++ {
-		addr := *laddr
-		addr.Port = 1024 + portRandomizer.Intn(60000)
-		sshListener, err = c.ListenTCP(&addr)
-		if err == nil {
-			laddr.Port = addr.Port
-			return sshListener, err
-		}
-	}
-	return nil, fmt.Errorf("ssh: listen on random port failed after %d tries: %v", tries, err)
-}
-
-// RFC 4254 7.1
-type channelForwardMsg struct {
-	addr  string
-	rport uint32
-}
-
-// ListenTCP requests the remote peer open a listening socket
-// on laddr. Incoming connections will be available by calling
-// Accept on the returned net.Listener.
-func (c *Client) ListenTCP(laddr *net.TCPAddr) (net.Listener, error) {
-	if laddr.Port == 0 && isBrokenOpenSSHVersion(string(c.ServerVersion())) {
-		return c.autoPortListenWorkaround(laddr)
-	}
-
-	m := channelForwardMsg{
-		laddr.IP.String(),
-		uint32(laddr.Port),
-	}
-	// send message
-	ok, resp, err := c.SendRequest("tcpip-forward", true, Marshal(&m))
-	if err != nil {
-		return nil, err
-	}
-	if !ok {
-		return nil, errors.New("ssh: tcpip-forward request denied by peer")
-	}
-
-	// If the original port was 0, then the remote side will
-	// supply a real port number in the response.
-	if laddr.Port == 0 {
-		var p struct {
-			Port uint32
-		}
-		if err := Unmarshal(resp, &p); err != nil {
-			return nil, err
-		}
-		laddr.Port = int(p.Port)
-	}
-
-	// Register this forward, using the port number we obtained.
-	ch := c.forwards.add(laddr)
-
-	return &tcpListener{laddr, c, ch}, nil
-}
-
-// forwardList stores a mapping between remote
-// forward requests and the tcpListeners.
-type forwardList struct {
-	sync.Mutex
-	entries []forwardEntry
-}
-
-// forwardEntry represents an established mapping of a laddr on a
-// remote ssh server to a channel connected to a tcpListener.
-type forwardEntry struct {
-	laddr net.Addr
-	c     chan forward
-}
-
-// forward represents an incoming forwarded tcpip connection. The
-// arguments to add/remove/lookup should be address as specified in
-// the original forward-request.
-type forward struct {
-	newCh NewChannel // the ssh client channel underlying this forward
-	raddr net.Addr   // the raddr of the incoming connection
-}
-
-func (l *forwardList) add(addr net.Addr) chan forward {
-	l.Lock()
-	defer l.Unlock()
-	f := forwardEntry{
-		laddr: addr,
-		c:     make(chan forward, 1),
-	}
-	l.entries = append(l.entries, f)
-	return f.c
-}
-
-// See RFC 4254, section 7.2
-type forwardedTCPPayload struct {
-	Addr       string
-	Port       uint32
-	OriginAddr string
-	OriginPort uint32
-}
-
-// parseTCPAddr parses the originating address from the remote into a *net.TCPAddr.
-func parseTCPAddr(addr string, port uint32) (*net.TCPAddr, error) {
-	if port == 0 || port > 65535 {
-		return nil, fmt.Errorf("ssh: port number out of range: %d", port)
-	}
-	ip := net.ParseIP(string(addr))
-	if ip == nil {
-		return nil, fmt.Errorf("ssh: cannot parse IP address %q", addr)
-	}
-	return &net.TCPAddr{IP: ip, Port: int(port)}, nil
-}
-
-func (l *forwardList) handleChannels(in <-chan NewChannel) {
-	for ch := range in {
-		var (
-			laddr net.Addr
-			raddr net.Addr
-			err   error
-		)
-		switch channelType := ch.ChannelType(); channelType {
-		case "forwarded-tcpip":
-			var payload forwardedTCPPayload
-			if err = Unmarshal(ch.ExtraData(), &payload); err != nil {
-				ch.Reject(ConnectionFailed, "could not parse forwarded-tcpip payload: "+err.Error())
-				continue
-			}
-
-			// RFC 4254 section 7.2 specifies that incoming
-			// addresses should list the address, in string
-			// format. It is implied that this should be an IP
-			// address, as it would be impossible to connect to it
-			// otherwise.
-			laddr, err = parseTCPAddr(payload.Addr, payload.Port)
-			if err != nil {
-				ch.Reject(ConnectionFailed, err.Error())
-				continue
-			}
-			raddr, err = parseTCPAddr(payload.OriginAddr, payload.OriginPort)
-			if err != nil {
-				ch.Reject(ConnectionFailed, err.Error())
-				continue
-			}
-
-		case "forwarded-streamlocal@openssh.com":
-			var payload forwardedStreamLocalPayload
-			if err = Unmarshal(ch.ExtraData(), &payload); err != nil {
-				ch.Reject(ConnectionFailed, "could not parse forwarded-streamlocal@openssh.com payload: "+err.Error())
-				continue
-			}
-			laddr = &net.UnixAddr{
-				Name: payload.SocketPath,
-				Net:  "unix",
-			}
-			raddr = &net.UnixAddr{
-				Name: "@",
-				Net:  "unix",
-			}
-		default:
-			panic(fmt.Errorf("ssh: unknown channel type %s", channelType))
-		}
-		if ok := l.forward(laddr, raddr, ch); !ok {
-			// Section 7.2, implementations MUST reject spurious incoming
-			// connections.
-			ch.Reject(Prohibited, "no forward for address")
-			continue
-		}
-
-	}
-}
-
-// remove removes the forward entry, and the channel feeding its
-// listener.
-func (l *forwardList) remove(addr net.Addr) {
-	l.Lock()
-	defer l.Unlock()
-	for i, f := range l.entries {
-		if addr.Network() == f.laddr.Network() && addr.String() == f.laddr.String() {
-			l.entries = append(l.entries[:i], l.entries[i+1:]...)
-			close(f.c)
-			return
-		}
-	}
-}
-
-// closeAll closes and clears all forwards.
-func (l *forwardList) closeAll() {
-	l.Lock()
-	defer l.Unlock()
-	for _, f := range l.entries {
-		close(f.c)
-	}
-	l.entries = nil
-}
-
-func (l *forwardList) forward(laddr, raddr net.Addr, ch NewChannel) bool {
-	l.Lock()
-	defer l.Unlock()
-	for _, f := range l.entries {
-		if laddr.Network() == f.laddr.Network() && laddr.String() == f.laddr.String() {
-			f.c <- forward{newCh: ch, raddr: raddr}
-			return true
-		}
-	}
-	return false
-}
-
-type tcpListener struct {
-	laddr *net.TCPAddr
-
-	conn *Client
-	in   <-chan forward
-}
-
-// Accept waits for and returns the next connection to the listener.
-func (l *tcpListener) Accept() (net.Conn, error) {
-	s, ok := <-l.in
-	if !ok {
-		return nil, io.EOF
-	}
-	ch, incoming, err := s.newCh.Accept()
-	if err != nil {
-		return nil, err
-	}
-	go DiscardRequests(incoming)
-
-	return &chanConn{
-		Channel: ch,
-		laddr:   l.laddr,
-		raddr:   s.raddr,
-	}, nil
-}
-
-// Close closes the listener.
-func (l *tcpListener) Close() error {
-	m := channelForwardMsg{
-		l.laddr.IP.String(),
-		uint32(l.laddr.Port),
-	}
-
-	// this also closes the listener.
-	l.conn.forwards.remove(l.laddr)
-	ok, _, err := l.conn.SendRequest("cancel-tcpip-forward", true, Marshal(&m))
-	if err == nil && !ok {
-		err = errors.New("ssh: cancel-tcpip-forward failed")
-	}
-	return err
-}
-
-// Addr returns the listener's network address.
-func (l *tcpListener) Addr() net.Addr {
-	return l.laddr
-}
-
-// Dial initiates a connection to the addr from the remote host.
-// The resulting connection has a zero LocalAddr() and RemoteAddr().
-func (c *Client) Dial(n, addr string) (net.Conn, error) {
-	var ch Channel
-	switch n {
-	case "tcp", "tcp4", "tcp6":
-		// Parse the address into host and numeric port.
-		host, portString, err := net.SplitHostPort(addr)
-		if err != nil {
-			return nil, err
-		}
-		port, err := strconv.ParseUint(portString, 10, 16)
-		if err != nil {
-			return nil, err
-		}
-		ch, err = c.dial(net.IPv4zero.String(), 0, host, int(port))
-		if err != nil {
-			return nil, err
-		}
-		// Use a zero address for local and remote address.
-		zeroAddr := &net.TCPAddr{
-			IP:   net.IPv4zero,
-			Port: 0,
-		}
-		return &chanConn{
-			Channel: ch,
-			laddr:   zeroAddr,
-			raddr:   zeroAddr,
-		}, nil
-	case "unix":
-		var err error
-		ch, err = c.dialStreamLocal(addr)
-		if err != nil {
-			return nil, err
-		}
-		return &chanConn{
-			Channel: ch,
-			laddr: &net.UnixAddr{
-				Name: "@",
-				Net:  "unix",
-			},
-			raddr: &net.UnixAddr{
-				Name: addr,
-				Net:  "unix",
-			},
-		}, nil
-	default:
-		return nil, fmt.Errorf("ssh: unsupported protocol: %s", n)
-	}
-}
-
-// DialTCP connects to the remote address raddr on the network net,
-// which must be "tcp", "tcp4", or "tcp6".  If laddr is not nil, it is used
-// as the local address for the connection.
-func (c *Client) DialTCP(n string, laddr, raddr *net.TCPAddr) (net.Conn, error) {
-	if laddr == nil {
-		laddr = &net.TCPAddr{
-			IP:   net.IPv4zero,
-			Port: 0,
-		}
-	}
-	ch, err := c.dial(laddr.IP.String(), laddr.Port, raddr.IP.String(), raddr.Port)
-	if err != nil {
-		return nil, err
-	}
-	return &chanConn{
-		Channel: ch,
-		laddr:   laddr,
-		raddr:   raddr,
-	}, nil
-}
-
-// RFC 4254 7.2
-type channelOpenDirectMsg struct {
-	raddr string
-	rport uint32
-	laddr string
-	lport uint32
-}
-
-func (c *Client) dial(laddr string, lport int, raddr string, rport int) (Channel, error) {
-	msg := channelOpenDirectMsg{
-		raddr: raddr,
-		rport: uint32(rport),
-		laddr: laddr,
-		lport: uint32(lport),
-	}
-	ch, in, err := c.OpenChannel("direct-tcpip", Marshal(&msg))
-	if err != nil {
-		return nil, err
-	}
-	go DiscardRequests(in)
-	return ch, err
-}
-
-type tcpChan struct {
-	Channel // the backing channel
-}
-
-// chanConn fulfills the net.Conn interface without
-// the tcpChan having to hold laddr or raddr directly.
-type chanConn struct {
-	Channel
-	laddr, raddr net.Addr
-}
-
-// LocalAddr returns the local network address.
-func (t *chanConn) LocalAddr() net.Addr {
-	return t.laddr
-}
-
-// RemoteAddr returns the remote network address.
-func (t *chanConn) RemoteAddr() net.Addr {
-	return t.raddr
-}
-
-// SetDeadline sets the read and write deadlines associated
-// with the connection.
-func (t *chanConn) SetDeadline(deadline time.Time) error {
-	if err := t.SetReadDeadline(deadline); err != nil {
-		return err
-	}
-	return t.SetWriteDeadline(deadline)
-}
-
-// SetReadDeadline sets the read deadline.
-// A zero value for t means Read will not time out.
-// After the deadline, the error from Read will implement net.Error
-// with Timeout() == true.
-func (t *chanConn) SetReadDeadline(deadline time.Time) error {
-	// for compatibility with previous version,
-	// the error message contains "tcpChan"
-	return errors.New("ssh: tcpChan: deadline not supported")
-}
-
-// SetWriteDeadline exists to satisfy the net.Conn interface
-// but is not implemented by this type.  It always returns an error.
-func (t *chanConn) SetWriteDeadline(deadline time.Time) error {
-	return errors.New("ssh: tcpChan: deadline not supported")
-}

vendor/golang.org/x/crypto/ssh/transport.go

@@ -1,375 +0,0 @@
-// Copyright 2011 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package ssh
-
-import (
-	"bufio"
-	"errors"
-	"io"
-	"log"
-)
-
-// debugTransport if set, will print packet types as they go over the
-// wire. No message decoding is done, to minimize the impact on timing.
-const debugTransport = false
-
-const (
-	gcmCipherID    = "aes128-gcm@openssh.com"
-	aes128cbcID    = "aes128-cbc"
-	tripledescbcID = "3des-cbc"
-)
-
-// packetConn represents a transport that implements packet based
-// operations.
-type packetConn interface {
-	// Encrypt and send a packet of data to the remote peer.
-	writePacket(packet []byte) error
-
-	// Read a packet from the connection. The read is blocking,
-	// i.e. if error is nil, then the returned byte slice is
-	// always non-empty.
-	readPacket() ([]byte, error)
-
-	// Close closes the write-side of the connection.
-	Close() error
-}
-
-// transport is the keyingTransport that implements the SSH packet
-// protocol.
-type transport struct {
-	reader connectionState
-	writer connectionState
-
-	bufReader *bufio.Reader
-	bufWriter *bufio.Writer
-	rand      io.Reader
-	isClient  bool
-	io.Closer
-}
-
-// packetCipher represents a combination of SSH encryption/MAC
-// protocol.  A single instance should be used for one direction only.
-type packetCipher interface {
-	// writePacket encrypts the packet and writes it to w. The
-	// contents of the packet are generally scrambled.
-	writePacket(seqnum uint32, w io.Writer, rand io.Reader, packet []byte) error
-
-	// readPacket reads and decrypts a packet of data. The
-	// returned packet may be overwritten by future calls of
-	// readPacket.
-	readPacket(seqnum uint32, r io.Reader) ([]byte, error)
-}
-
-// connectionState represents one side (read or write) of the
-// connection. This is necessary because each direction has its own
-// keys, and can even have its own algorithms
-type connectionState struct {
-	packetCipher
-	seqNum           uint32
-	dir              direction
-	pendingKeyChange chan packetCipher
-}
-
-// prepareKeyChange sets up key material for a keychange. The key changes in
-// both directions are triggered by reading and writing a msgNewKey packet
-// respectively.
-func (t *transport) prepareKeyChange(algs *algorithms, kexResult *kexResult) error {
-	if ciph, err := newPacketCipher(t.reader.dir, algs.r, kexResult); err != nil {
-		return err
-	} else {
-		t.reader.pendingKeyChange <- ciph
-	}
-
-	if ciph, err := newPacketCipher(t.writer.dir, algs.w, kexResult); err != nil {
-		return err
-	} else {
-		t.writer.pendingKeyChange <- ciph
-	}
-
-	return nil
-}
-
-func (t *transport) printPacket(p []byte, write bool) {
-	if len(p) == 0 {
-		return
-	}
-	who := "server"
-	if t.isClient {
-		who = "client"
-	}
-	what := "read"
-	if write {
-		what = "write"
-	}
-
-	log.Println(what, who, p[0])
-}
-
-// Read and decrypt next packet.
-func (t *transport) readPacket() (p []byte, err error) {
-	for {
-		p, err = t.reader.readPacket(t.bufReader)
-		if err != nil {
-			break
-		}
-		if len(p) == 0 || (p[0] != msgIgnore && p[0] != msgDebug) {
-			break
-		}
-	}
-	if debugTransport {
-		t.printPacket(p, false)
-	}
-
-	return p, err
-}
-
-func (s *connectionState) readPacket(r *bufio.Reader) ([]byte, error) {
-	packet, err := s.packetCipher.readPacket(s.seqNum, r)
-	s.seqNum++
-	if err == nil && len(packet) == 0 {
-		err = errors.New("ssh: zero length packet")
-	}
-
-	if len(packet) > 0 {
-		switch packet[0] {
-		case msgNewKeys:
-			select {
-			case cipher := <-s.pendingKeyChange:
-				s.packetCipher = cipher
-			default:
-				return nil, errors.New("ssh: got bogus newkeys message.")
-			}
-
-		case msgDisconnect:
-			// Transform a disconnect message into an
-			// error. Since this is lowest level at which
-			// we interpret message types, doing it here
-			// ensures that we don't have to handle it
-			// elsewhere.
-			var msg disconnectMsg
-			if err := Unmarshal(packet, &msg); err != nil {
-				return nil, err
-			}
-			return nil, &msg
-		}
-	}
-
-	// The packet may point to an internal buffer, so copy the
-	// packet out here.
-	fresh := make([]byte, len(packet))
-	copy(fresh, packet)
-
-	return fresh, err
-}
-
-func (t *transport) writePacket(packet []byte) error {
-	if debugTransport {
-		t.printPacket(packet, true)
-	}
-	return t.writer.writePacket(t.bufWriter, t.rand, packet)
-}
-
-func (s *connectionState) writePacket(w *bufio.Writer, rand io.Reader, packet []byte) error {
-	changeKeys := len(packet) > 0 && packet[0] == msgNewKeys
-
-	err := s.packetCipher.writePacket(s.seqNum, w, rand, packet)
-	if err != nil {
-		return err
-	}
-	if err = w.Flush(); err != nil {
-		return err
-	}
-	s.seqNum++
-	if changeKeys {
-		select {
-		case cipher := <-s.pendingKeyChange:
-			s.packetCipher = cipher
-		default:
-			panic("ssh: no key material for msgNewKeys")
-		}
-	}
-	return err
-}
-
-func newTransport(rwc io.ReadWriteCloser, rand io.Reader, isClient bool) *transport {
-	t := &transport{
-		bufReader: bufio.NewReader(rwc),
-		bufWriter: bufio.NewWriter(rwc),
-		rand:      rand,
-		reader: connectionState{
-			packetCipher:     &streamPacketCipher{cipher: noneCipher{}},
-			pendingKeyChange: make(chan packetCipher, 1),
-		},
-		writer: connectionState{
-			packetCipher:     &streamPacketCipher{cipher: noneCipher{}},
-			pendingKeyChange: make(chan packetCipher, 1),
-		},
-		Closer: rwc,
-	}
-	t.isClient = isClient
-
-	if isClient {
-		t.reader.dir = serverKeys
-		t.writer.dir = clientKeys
-	} else {
-		t.reader.dir = clientKeys
-		t.writer.dir = serverKeys
-	}
-
-	return t
-}
-
-type direction struct {
-	ivTag     []byte
-	keyTag    []byte
-	macKeyTag []byte
-}
-
-var (
-	serverKeys = direction{[]byte{'B'}, []byte{'D'}, []byte{'F'}}
-	clientKeys = direction{[]byte{'A'}, []byte{'C'}, []byte{'E'}}
-)
-
-// generateKeys generates key material for IV, MAC and encryption.
-func generateKeys(d direction, algs directionAlgorithms, kex *kexResult) (iv, key, macKey []byte) {
-	cipherMode := cipherModes[algs.Cipher]
-	macMode := macModes[algs.MAC]
-
-	iv = make([]byte, cipherMode.ivSize)
-	key = make([]byte, cipherMode.keySize)
-	macKey = make([]byte, macMode.keySize)
-
-	generateKeyMaterial(iv, d.ivTag, kex)
-	generateKeyMaterial(key, d.keyTag, kex)
-	generateKeyMaterial(macKey, d.macKeyTag, kex)
-	return
-}
-
-// setupKeys sets the cipher and MAC keys from kex.K, kex.H and sessionId, as
-// described in RFC 4253, section 6.4. direction should either be serverKeys
-// (to setup server->client keys) or clientKeys (for client->server keys).
-func newPacketCipher(d direction, algs directionAlgorithms, kex *kexResult) (packetCipher, error) {
-	iv, key, macKey := generateKeys(d, algs, kex)
-
-	if algs.Cipher == gcmCipherID {
-		return newGCMCipher(iv, key, macKey)
-	}
-
-	if algs.Cipher == aes128cbcID {
-		return newAESCBCCipher(iv, key, macKey, algs)
-	}
-
-	if algs.Cipher == tripledescbcID {
-		return newTripleDESCBCCipher(iv, key, macKey, algs)
-	}
-
-	c := &streamPacketCipher{
-		mac: macModes[algs.MAC].new(macKey),
-		etm: macModes[algs.MAC].etm,
-	}
-	c.macResult = make([]byte, c.mac.Size())
-
-	var err error
-	c.cipher, err = cipherModes[algs.Cipher].createStream(key, iv)
-	if err != nil {
-		return nil, err
-	}
-
-	return c, nil
-}
-
-// generateKeyMaterial fills out with key material generated from tag, K, H
-// and sessionId, as specified in RFC 4253, section 7.2.
-func generateKeyMaterial(out, tag []byte, r *kexResult) {
-	var digestsSoFar []byte
-
-	h := r.Hash.New()
-	for len(out) > 0 {
-		h.Reset()
-		h.Write(r.K)
-		h.Write(r.H)
-
-		if len(digestsSoFar) == 0 {
-			h.Write(tag)
-			h.Write(r.SessionID)
-		} else {
-			h.Write(digestsSoFar)
-		}
-
-		digest := h.Sum(nil)
-		n := copy(out, digest)
-		out = out[n:]
-		if len(out) > 0 {
-			digestsSoFar = append(digestsSoFar, digest...)
-		}
-	}
-}
-
-const packageVersion = "SSH-2.0-Go"
-
-// Sends and receives a version line.  The versionLine string should
-// be US ASCII, start with "SSH-2.0-", and should not include a
-// newline. exchangeVersions returns the other side's version line.
-func exchangeVersions(rw io.ReadWriter, versionLine []byte) (them []byte, err error) {
-	// Contrary to the RFC, we do not ignore lines that don't
-	// start with "SSH-2.0-" to make the library usable with
-	// nonconforming servers.
-	for _, c := range versionLine {
-		// The spec disallows non US-ASCII chars, and
-		// specifically forbids null chars.
-		if c < 32 {
-			return nil, errors.New("ssh: junk character in version line")
-		}
-	}
-	if _, err = rw.Write(append(versionLine, '\r', '\n')); err != nil {
-		return
-	}
-
-	them, err = readVersion(rw)
-	return them, err
-}
-
-// maxVersionStringBytes is the maximum number of bytes that we'll
-// accept as a version string. RFC 4253 section 4.2 limits this at 255
-// chars
-const maxVersionStringBytes = 255
-
-// Read version string as specified by RFC 4253, section 4.2.
-func readVersion(r io.Reader) ([]byte, error) {
-	versionString := make([]byte, 0, 64)
-	var ok bool
-	var buf [1]byte
-
-	for len(versionString) < maxVersionStringBytes {
-		_, err := io.ReadFull(r, buf[:])
-		if err != nil {
-			return nil, err
-		}
-		// The RFC says that the version should be terminated with \r\n
-		// but several SSH servers actually only send a \n.
-		if buf[0] == '\n' {
-			ok = true
-			break
-		}
-
-		// non ASCII chars are disallowed, but we are lenient,
-		// since Go doesn't use null-terminated strings.
-
-		// The RFC allows a comment after a space, however,
-		// all of it (version and comments) goes into the
-		// session hash.
-		versionString = append(versionString, buf[0])
-	}
-
-	if !ok {
-		return nil, errors.New("ssh: overflow reading version string")
-	}
-
-	// There might be a '\r' on the end which we should remove.
-	if len(versionString) > 0 && versionString[len(versionString)-1] == '\r' {
-		versionString = versionString[:len(versionString)-1]
-	}
-	return versionString, nil
-}

vendor/golang.org/x/text/doc.go

@@ -1,13 +0,0 @@
-// Copyright 2015 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-//go:generate go run gen.go
-
-// text is a repository of text-related packages related to internationalization
-// (i18n) and localization (l10n), such as character encodings, text
-// transformations, and locale-specific text handling.
-package text
-
-// TODO: more documentation on general concepts, such as Transformers, use
-// of normalization, etc.

vendor/golang.org/x/text/gen.go

@@ -1,292 +0,0 @@
-// Copyright 2015 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// +build ignore
-
-// gen runs go generate on Unicode- and CLDR-related package in the text
-// repositories, taking into account dependencies and versions.
-package main
-
-import (
-	"bytes"
-	"flag"
-	"fmt"
-	"go/build"
-	"go/format"
-	"io/ioutil"
-	"os"
-	"os/exec"
-	"path"
-	"path/filepath"
-	"regexp"
-	"runtime"
-	"strings"
-	"sync"
-	"unicode"
-
-	"golang.org/x/text/internal/gen"
-)
-
-var (
-	verbose     = flag.Bool("v", false, "verbose output")
-	force       = flag.Bool("force", false, "ignore failing dependencies")
-	doCore      = flag.Bool("core", false, "force an update to core")
-	excludeList = flag.String("exclude", "",
-		"comma-separated list of packages to exclude")
-
-	// The user can specify a selection of packages to build on the command line.
-	args []string
-)
-
-func exclude(pkg string) bool {
-	if len(args) > 0 {
-		return !contains(args, pkg)
-	}
-	return contains(strings.Split(*excludeList, ","), pkg)
-}
-
-// TODO:
-// - Better version handling.
-// - Generate tables for the core unicode package?
-// - Add generation for encodings. This requires some retooling here and there.
-// - Running repo-wide "long" tests.
-
-var vprintf = fmt.Printf
-
-func main() {
-	gen.Init()
-	args = flag.Args()
-	if !*verbose {
-		// Set vprintf to a no-op.
-		vprintf = func(string, ...interface{}) (int, error) { return 0, nil }
-	}
-
-	// TODO: create temporary cache directory to load files and create and set
-	// a "cache" option if the user did not specify the UNICODE_DIR environment
-	// variable. This will prevent duplicate downloads and also will enable long
-	// tests, which really need to be run after each generated package.
-
-	updateCore := *doCore
-	if gen.UnicodeVersion() != unicode.Version {
-		fmt.Printf("Requested Unicode version %s; core unicode version is %s.\n",
-			gen.UnicodeVersion(),
-			unicode.Version)
-		// TODO: use collate to compare. Simple comparison will work, though,
-		// until Unicode reaches version 10. To avoid circular dependencies, we
-		// could use the NumericWeighter without using package collate using a
-		// trivial Weighter implementation.
-		if gen.UnicodeVersion() < unicode.Version && !*force {
-			os.Exit(2)
-		}
-		updateCore = true
-	}
-
-	var unicode = &dependency{}
-	if updateCore {
-		fmt.Printf("Updating core to version %s...\n", gen.UnicodeVersion())
-		unicode = generate("unicode")
-
-		// Test some users of the unicode packages, especially the ones that
-		// keep a mirrored table. These may need to be corrected by hand.
-		generate("regexp", unicode)
-		generate("strconv", unicode) // mimics Unicode table
-		generate("strings", unicode)
-		generate("testing", unicode) // mimics Unicode table
-	}
-
-	var (
-		cldr       = generate("./unicode/cldr", unicode)
-		language   = generate("./language", cldr)
-		internal   = generate("./internal", unicode, language)
-		norm       = generate("./unicode/norm", unicode)
-		rangetable = generate("./unicode/rangetable", unicode)
-		cases      = generate("./cases", unicode, norm, language, rangetable)
-		width      = generate("./width", unicode)
-		bidi       = generate("./unicode/bidi", unicode, norm, rangetable)
-		mib        = generate("./encoding/internal/identifier", unicode)
-		_          = generate("./encoding/htmlindex", unicode, language, mib)
-		_          = generate("./encoding/ianaindex", unicode, language, mib)
-		_          = generate("./secure/precis", unicode, norm, rangetable, cases, width, bidi)
-		_          = generate("./currency", unicode, cldr, language, internal)
-		_          = generate("./internal/number", unicode, cldr, language, internal)
-		_          = generate("./feature/plural", unicode, cldr, language, internal)
-		_          = generate("./internal/export/idna", unicode, bidi, norm)
-		_          = generate("./language/display", unicode, cldr, language, internal)
-		_          = generate("./collate", unicode, norm, cldr, language, rangetable)
-		_          = generate("./search", unicode, norm, cldr, language, rangetable)
-	)
-	all.Wait()
-
-	// Copy exported packages to the destination golang.org repo.
-	copyExported("golang.org/x/net/idna")
-
-	if updateCore {
-		copyVendored()
-	}
-
-	if hasErrors {
-		fmt.Println("FAIL")
-		os.Exit(1)
-	}
-	vprintf("SUCCESS\n")
-}
-
-var (
-	all       sync.WaitGroup
-	hasErrors bool
-)
-
-type dependency struct {
-	sync.WaitGroup
-	hasErrors bool
-}
-
-func generate(pkg string, deps ...*dependency) *dependency {
-	var wg dependency
-	if exclude(pkg) {
-		return &wg
-	}
-	wg.Add(1)
-	all.Add(1)
-	go func() {
-		defer wg.Done()
-		defer all.Done()
-		// Wait for dependencies to finish.
-		for _, d := range deps {
-			d.Wait()
-			if d.hasErrors && !*force {
-				fmt.Printf("--- ABORT: %s\n", pkg)
-				wg.hasErrors = true
-				return
-			}
-		}
-		vprintf("=== GENERATE %s\n", pkg)
-		args := []string{"generate"}
-		if *verbose {
-			args = append(args, "-v")
-		}
-		args = append(args, pkg)
-		cmd := exec.Command(filepath.Join(runtime.GOROOT(), "bin", "go"), args...)
-		w := &bytes.Buffer{}
-		cmd.Stderr = w
-		cmd.Stdout = w
-		if err := cmd.Run(); err != nil {
-			fmt.Printf("--- FAIL: %s:\n\t%v\n\tError: %v\n", pkg, indent(w), err)
-			hasErrors = true
-			wg.hasErrors = true
-			return
-		}
-
-		vprintf("=== TEST %s\n", pkg)
-		args[0] = "test"
-		cmd = exec.Command(filepath.Join(runtime.GOROOT(), "bin", "go"), args...)
-		wt := &bytes.Buffer{}
-		cmd.Stderr = wt
-		cmd.Stdout = wt
-		if err := cmd.Run(); err != nil {
-			fmt.Printf("--- FAIL: %s:\n\t%v\n\tError: %v\n", pkg, indent(wt), err)
-			hasErrors = true
-			wg.hasErrors = true
-			return
-		}
-		vprintf("--- SUCCESS: %s\n\t%v\n", pkg, indent(w))
-		fmt.Print(wt.String())
-	}()
-	return &wg
-}
-
-// copyExported copies a package in x/text/internal/export to the
-// destination repository.
-func copyExported(p string) {
-	copyPackage(
-		filepath.Join("internal", "export", path.Base(p)),
-		filepath.Join("..", filepath.FromSlash(p[len("golang.org/x"):])),
-		"golang.org/x/text/internal/export/"+path.Base(p),
-		p)
-}
-
-// copyVendored copies packages used by Go core into the vendored directory.
-func copyVendored() {
-	root := filepath.Join(build.Default.GOROOT, filepath.FromSlash("src/vendor/golang_org/x"))
-
-	err := filepath.Walk(root, func(dir string, info os.FileInfo, err error) error {
-		if err != nil || !info.IsDir() || root == dir {
-			return err
-		}
-		src := dir[len(root)+1:]
-		const slash = string(filepath.Separator)
-		if c := strings.Split(src, slash); c[0] == "text" {
-			// Copy a text repo package from its normal location.
-			src = strings.Join(c[1:], slash)
-		} else {
-			// Copy the vendored package if it exists in the export directory.
-			src = filepath.Join("internal", "export", filepath.Base(src))
-		}
-		copyPackage(src, dir, "golang.org", "golang_org")
-		return nil
-	})
-	if err != nil {
-		fmt.Printf("Seeding directory %s has failed %v:", root, err)
-		os.Exit(1)
-	}
-}
-
-// goGenRE is used to remove go:generate lines.
-var goGenRE = regexp.MustCompile("//go:generate[^\n]*\n")
-
-// copyPackage copies relevant files from a directory in x/text to the
-// destination package directory. The destination package is assumed to have
-// the same name. For each copied file go:generate lines are removed and
-// and package comments are rewritten to the new path.
-func copyPackage(dirSrc, dirDst, search, replace string) {
-	err := filepath.Walk(dirSrc, func(file string, info os.FileInfo, err error) error {
-		base := filepath.Base(file)
-		if err != nil || info.IsDir() ||
-			!strings.HasSuffix(base, ".go") ||
-			strings.HasSuffix(base, "_test.go") && !strings.HasPrefix(base, "example") ||
-			// Don't process subdirectories.
-			filepath.Dir(file) != dirSrc {
-			return nil
-		}
-		b, err := ioutil.ReadFile(file)
-		if err != nil || bytes.Contains(b, []byte("\n// +build ignore")) {
-			return err
-		}
-		// Fix paths.
-		b = bytes.Replace(b, []byte(search), []byte(replace), -1)
-		// Remove go:generate lines.
-		b = goGenRE.ReplaceAllLiteral(b, nil)
-		comment := "// Code generated by running \"go generate\" in golang.org/x/text. DO NOT EDIT.\n\n"
-		if *doCore {
-			comment = "// Code generated by running \"go run gen.go -core\" in golang.org/x/text. DO NOT EDIT.\n\n"
-		}
-		if !bytes.HasPrefix(b, []byte(comment)) {
-			b = append([]byte(comment), b...)
-		}
-		if b, err = format.Source(b); err != nil {
-			fmt.Println("Failed to format file:", err)
-			os.Exit(1)
-		}
-		file = filepath.Join(dirDst, base)
-		vprintf("=== COPY %s\n", file)
-		return ioutil.WriteFile(file, b, 0666)
-	})
-	if err != nil {
-		fmt.Println("Copying exported files failed:", err)
-		os.Exit(1)
-	}
-}
-
-func contains(a []string, s string) bool {
-	for _, e := range a {
-		if s == e {
-			return true
-		}
-	}
-	return false
-}
-
-func indent(b *bytes.Buffer) string {
-	return strings.Replace(strings.TrimSpace(b.String()), "\n", "\n\t", -1)
-}

vendor/golang.org/x/text/internal/gen.go

@@ -1,52 +0,0 @@
-// Copyright 2015 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// +build ignore
-
-package main
-
-import (
-	"log"
-
-	"golang.org/x/text/internal/gen"
-	"golang.org/x/text/language"
-	"golang.org/x/text/unicode/cldr"
-)
-
-func main() {
-	r := gen.OpenCLDRCoreZip()
-	defer r.Close()
-
-	d := &cldr.Decoder{}
-	data, err := d.DecodeZip(r)
-	if err != nil {
-		log.Fatalf("DecodeZip: %v", err)
-	}
-
-	w := gen.NewCodeWriter()
-	defer w.WriteGoFile("tables.go", "internal")
-
-	// Create parents table.
-	parents := make([]uint16, language.NumCompactTags)
-	for _, loc := range data.Locales() {
-		tag := language.MustParse(loc)
-		index, ok := language.CompactIndex(tag)
-		if !ok {
-			continue
-		}
-		parentIndex := 0 // und
-		for p := tag.Parent(); p != language.Und; p = p.Parent() {
-			if x, ok := language.CompactIndex(p); ok {
-				parentIndex = x
-				break
-			}
-		}
-		parents[index] = uint16(parentIndex)
-	}
-
-	w.WriteComment(`
-	Parent maps a compact index of a tag to the compact index of the parent of
-	this tag.`)
-	w.WriteVar("Parent", parents)
-}

vendor/golang.org/x/text/internal/internal.go

@@ -1,51 +0,0 @@
-// Copyright 2015 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-//go:generate go run gen.go
-
-// Package internal contains non-exported functionality that are used by
-// packages in the text repository.
-package internal // import "golang.org/x/text/internal"
-
-import (
-	"sort"
-
-	"golang.org/x/text/language"
-)
-
-// SortTags sorts tags in place.
-func SortTags(tags []language.Tag) {
-	sort.Sort(sorter(tags))
-}
-
-type sorter []language.Tag
-
-func (s sorter) Len() int {
-	return len(s)
-}
-
-func (s sorter) Swap(i, j int) {
-	s[i], s[j] = s[j], s[i]
-}
-
-func (s sorter) Less(i, j int) bool {
-	return s[i].String() < s[j].String()
-}
-
-// UniqueTags sorts and filters duplicate tags in place and returns a slice with
-// only unique tags.
-func UniqueTags(tags []language.Tag) []language.Tag {
-	if len(tags) <= 1 {
-		return tags
-	}
-	SortTags(tags)
-	k := 0
-	for i := 1; i < len(tags); i++ {
-		if tags[k].String() < tags[i].String() {
-			k++
-			tags[k] = tags[i]
-		}
-	}
-	return tags[:k+1]
-}

vendor/golang.org/x/text/internal/match.go

@@ -1,67 +0,0 @@
-// Copyright 2015 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package internal
-
-// This file contains matchers that implement CLDR inheritance.
-//
-//     See http://unicode.org/reports/tr35/#Locale_Inheritance.
-//
-// Some of the inheritance described in this document is already handled by
-// the cldr package.
-
-import (
-	"golang.org/x/text/language"
-)
-
-// TODO: consider if (some of the) matching algorithm needs to be public after
-// getting some feel about what is generic and what is specific.
-
-// NewInheritanceMatcher returns a matcher that matches based on the inheritance
-// chain.
-//
-// The matcher uses canonicalization and the parent relationship to find a
-// match. The resulting match will always be either Und or a language with the
-// same language and script as the requested language. It will not match
-// languages for which there is understood to be mutual or one-directional
-// intelligibility.
-//
-// A Match will indicate an Exact match if the language matches after
-// canonicalization and High if the matched tag is a parent.
-func NewInheritanceMatcher(t []language.Tag) *InheritanceMatcher {
-	tags := &InheritanceMatcher{make(map[language.Tag]int)}
-	for i, tag := range t {
-		ct, err := language.All.Canonicalize(tag)
-		if err != nil {
-			ct = tag
-		}
-		tags.index[ct] = i
-	}
-	return tags
-}
-
-type InheritanceMatcher struct {
-	index map[language.Tag]int
-}
-
-func (m InheritanceMatcher) Match(want ...language.Tag) (language.Tag, int, language.Confidence) {
-	for _, t := range want {
-		ct, err := language.All.Canonicalize(t)
-		if err != nil {
-			ct = t
-		}
-		conf := language.Exact
-		for {
-			if index, ok := m.index[ct]; ok {
-				return ct, index, conf
-			}
-			if ct == language.Und {
-				break
-			}
-			ct = ct.Parent()
-			conf = language.High
-		}
-	}
-	return language.Und, 0, language.No
-}

vendor/golang.org/x/text/internal/tables.go

@@ -1,117 +0,0 @@
-// Code generated by running "go generate" in golang.org/x/text. DO NOT EDIT.
-
-package internal
-
-// Parent maps a compact index of a tag to the compact index of the parent of
-// this tag.
-var Parent = []uint16{ // 754 elements
-	// Entry 0 - 3F
-	0x0000, 0x0053, 0x00e5, 0x0000, 0x0003, 0x0003, 0x0000, 0x0006,
-	0x0000, 0x0008, 0x0000, 0x000a, 0x0000, 0x000c, 0x000c, 0x000c,
-	0x000c, 0x000c, 0x000c, 0x000c, 0x000c, 0x000c, 0x000c, 0x000c,
-	0x000c, 0x000c, 0x000c, 0x000c, 0x000c, 0x000c, 0x000c, 0x000c,
-	0x000c, 0x000c, 0x000c, 0x000c, 0x000c, 0x000c, 0x000c, 0x000c,
-	0x000c, 0x0000, 0x0000, 0x002a, 0x0000, 0x002c, 0x0000, 0x002e,
-	0x0000, 0x0000, 0x0031, 0x0030, 0x0030, 0x0000, 0x0035, 0x0000,
-	0x0037, 0x0000, 0x0039, 0x0000, 0x003b, 0x0000, 0x003d, 0x0000,
-	// Entry 40 - 7F
-	0x0000, 0x0040, 0x0000, 0x0042, 0x0042, 0x0000, 0x0045, 0x0045,
-	0x0000, 0x0048, 0x0000, 0x004a, 0x0000, 0x0000, 0x004d, 0x004c,
-	0x004c, 0x0000, 0x0051, 0x0051, 0x0051, 0x0051, 0x0000, 0x0056,
-	0x0000, 0x0058, 0x0000, 0x005a, 0x0000, 0x005c, 0x005c, 0x0000,
-	0x005f, 0x0000, 0x0061, 0x0000, 0x0063, 0x0000, 0x0065, 0x0065,
-	0x0000, 0x0068, 0x0000, 0x006a, 0x006a, 0x006a, 0x006a, 0x006a,
-	0x006a, 0x006a, 0x0000, 0x0072, 0x0000, 0x0074, 0x0000, 0x0076,
-	0x0000, 0x0000, 0x0079, 0x0000, 0x007b, 0x0000, 0x007d, 0x0000,
-	// Entry 80 - BF
-	0x007f, 0x007f, 0x0000, 0x0082, 0x0082, 0x0000, 0x0085, 0x0086,
-	0x0086, 0x0086, 0x0085, 0x0087, 0x0086, 0x0086, 0x0086, 0x0085,
-	0x0086, 0x0086, 0x0086, 0x0086, 0x0086, 0x0086, 0x0087, 0x0086,
-	0x0086, 0x0086, 0x0086, 0x0087, 0x0086, 0x0087, 0x0086, 0x0086,
-	0x0087, 0x0086, 0x0086, 0x0086, 0x0086, 0x0086, 0x0086, 0x0086,
-	0x0086, 0x0086, 0x0085, 0x0086, 0x0086, 0x0086, 0x0086, 0x0086,
-	0x0086, 0x0086, 0x0086, 0x0086, 0x0086, 0x0086, 0x0086, 0x0086,
-	0x0086, 0x0086, 0x0086, 0x0086, 0x0085, 0x0086, 0x0085, 0x0086,
-	// Entry C0 - FF
-	0x0086, 0x0086, 0x0086, 0x0086, 0x0086, 0x0086, 0x0086, 0x0087,
-	0x0086, 0x0086, 0x0086, 0x0086, 0x0086, 0x0086, 0x0086, 0x0085,
-	0x0086, 0x0086, 0x0086, 0x0086, 0x0086, 0x0087, 0x0086, 0x0086,
-	0x0087, 0x0086, 0x0086, 0x0086, 0x0086, 0x0086, 0x0086, 0x0086,
-	0x0086, 0x0086, 0x0086, 0x0086, 0x0085, 0x0085, 0x0086, 0x0086,
-	0x0085, 0x0086, 0x0086, 0x0086, 0x0086, 0x0086, 0x0000, 0x00ee,
-	0x0000, 0x00f0, 0x00f1, 0x00f1, 0x00f1, 0x00f1, 0x00f1, 0x00f1,
-	0x00f1, 0x00f1, 0x00f1, 0x00f0, 0x00f1, 0x00f0, 0x00f0, 0x00f1,
-	// Entry 100 - 13F
-	0x00f1, 0x00f0, 0x00f1, 0x00f1, 0x00f1, 0x00f1, 0x00f0, 0x00f1,
-	0x00f1, 0x00f1, 0x00f1, 0x00f1, 0x00f1, 0x0000, 0x010d, 0x0000,
-	0x010f, 0x0000, 0x0111, 0x0000, 0x0113, 0x0113, 0x0000, 0x0116,
-	0x0116, 0x0116, 0x0116, 0x0000, 0x011b, 0x0000, 0x011d, 0x0000,
-	0x011f, 0x011f, 0x0000, 0x0122, 0x0122, 0x0122, 0x0122, 0x0122,
-	0x0122, 0x0122, 0x0122, 0x0122, 0x0122, 0x0122, 0x0122, 0x0122,
-	0x0122, 0x0122, 0x0122, 0x0122, 0x0122, 0x0122, 0x0122, 0x0122,
-	0x0122, 0x0122, 0x0122, 0x0122, 0x0122, 0x0122, 0x0122, 0x0122,
-	// Entry 140 - 17F
-	0x0122, 0x0122, 0x0122, 0x0122, 0x0122, 0x0122, 0x0122, 0x0122,
-	0x0122, 0x0122, 0x0122, 0x0122, 0x0122, 0x0122, 0x0122, 0x0122,
-	0x0122, 0x0000, 0x0151, 0x0000, 0x0153, 0x0000, 0x0155, 0x0000,
-	0x0157, 0x0000, 0x0159, 0x0000, 0x015b, 0x015b, 0x015b, 0x0000,
-	0x015f, 0x0000, 0x0000, 0x0162, 0x0000, 0x0164, 0x0000, 0x0166,
-	0x0166, 0x0166, 0x0000, 0x016a, 0x0000, 0x016c, 0x0000, 0x016e,
-	0x0000, 0x0170, 0x0170, 0x0000, 0x0173, 0x0000, 0x0175, 0x0000,
-	0x0177, 0x0000, 0x0179, 0x0000, 0x017b, 0x0000, 0x017d, 0x0000,
-	// Entry 180 - 1BF
-	0x017f, 0x0000, 0x0181, 0x0181, 0x0181, 0x0181, 0x0000, 0x0000,
-	0x0187, 0x0000, 0x0000, 0x018a, 0x0000, 0x018c, 0x0000, 0x0000,
-	0x018f, 0x0000, 0x0191, 0x0000, 0x0000, 0x0194, 0x0000, 0x0000,
-	0x0197, 0x0000, 0x0199, 0x0000, 0x019b, 0x0000, 0x019d, 0x0000,
-	0x019f, 0x0000, 0x01a1, 0x0000, 0x01a3, 0x0000, 0x01a5, 0x0000,
-	0x01a7, 0x0000, 0x01a9, 0x0000, 0x01ab, 0x01ab, 0x0000, 0x01ae,
-	0x0000, 0x01b0, 0x0000, 0x01b2, 0x0000, 0x01b4, 0x0000, 0x01b6,
-	0x0000, 0x0000, 0x01b9, 0x0000, 0x01bb, 0x0000, 0x01bd, 0x0000,
-	// Entry 1C0 - 1FF
-	0x01bf, 0x0000, 0x01c1, 0x0000, 0x01c3, 0x0000, 0x01c5, 0x01c5,
-	0x01c5, 0x01c5, 0x0000, 0x01ca, 0x0000, 0x01cc, 0x01cc, 0x0000,
-	0x01cf, 0x0000, 0x01d1, 0x0000, 0x01d3, 0x0000, 0x01d5, 0x0000,
-	0x01d7, 0x0000, 0x01d9, 0x01d9, 0x0000, 0x01dc, 0x0000, 0x01de,
-	0x0000, 0x01e0, 0x0000, 0x01e2, 0x0000, 0x01e4, 0x0000, 0x01e6,
-	0x0000, 0x01e8, 0x0000, 0x01ea, 0x0000, 0x01ec, 0x0000, 0x01ee,
-	0x01ee, 0x01ee, 0x0000, 0x01f2, 0x0000, 0x01f4, 0x0000, 0x01f6,
-	0x0000, 0x01f8, 0x0000, 0x0000, 0x01fb, 0x0000, 0x01fd, 0x01fd,
-	// Entry 200 - 23F
-	0x0000, 0x0200, 0x0000, 0x0202, 0x0202, 0x0000, 0x0205, 0x0205,
-	0x0000, 0x0208, 0x0208, 0x0208, 0x0208, 0x0208, 0x0208, 0x0208,
-	0x0000, 0x0210, 0x0000, 0x0212, 0x0000, 0x0214, 0x0000, 0x0000,
-	0x0000, 0x0000, 0x0000, 0x021a, 0x0000, 0x0000, 0x021d, 0x0000,
-	0x021f, 0x021f, 0x0000, 0x0222, 0x0000, 0x0224, 0x0224, 0x0000,
-	0x0000, 0x0228, 0x0227, 0x0227, 0x0000, 0x0000, 0x022d, 0x0000,
-	0x022f, 0x0000, 0x0231, 0x0000, 0x023d, 0x0233, 0x023d, 0x023d,
-	0x023d, 0x023d, 0x023d, 0x023d, 0x023d, 0x0233, 0x023d, 0x023d,
-	// Entry 240 - 27F
-	0x0000, 0x0240, 0x0240, 0x0240, 0x0000, 0x0244, 0x0000, 0x0246,
-	0x0000, 0x0248, 0x0248, 0x0000, 0x024b, 0x0000, 0x024d, 0x024d,
-	0x024d, 0x024d, 0x024d, 0x024d, 0x0000, 0x0254, 0x0000, 0x0256,
-	0x0000, 0x0258, 0x0000, 0x025a, 0x0000, 0x025c, 0x0000, 0x0000,
-	0x025f, 0x025f, 0x025f, 0x0000, 0x0263, 0x0000, 0x0265, 0x0000,
-	0x0267, 0x0000, 0x0000, 0x026a, 0x0269, 0x0269, 0x0000, 0x026e,
-	0x0000, 0x0270, 0x0000, 0x0272, 0x0000, 0x0000, 0x0000, 0x0000,
-	0x0277, 0x0000, 0x0000, 0x027a, 0x0000, 0x027c, 0x027c, 0x027c,
-	// Entry 280 - 2BF
-	0x027c, 0x0000, 0x0281, 0x0281, 0x0281, 0x0000, 0x0285, 0x0285,
-	0x0285, 0x0285, 0x0285, 0x0000, 0x028b, 0x028b, 0x028b, 0x028b,
-	0x0000, 0x0000, 0x0000, 0x0000, 0x0293, 0x0293, 0x0293, 0x0000,
-	0x0297, 0x0297, 0x0297, 0x0297, 0x0000, 0x0000, 0x029d, 0x029d,
-	0x029d, 0x029d, 0x0000, 0x02a2, 0x0000, 0x02a4, 0x02a4, 0x0000,
-	0x02a7, 0x0000, 0x02a9, 0x02a9, 0x0000, 0x0000, 0x02ad, 0x0000,
-	0x0000, 0x02b0, 0x0000, 0x02b2, 0x02b2, 0x0000, 0x0000, 0x02b6,
-	0x0000, 0x02b8, 0x0000, 0x02ba, 0x0000, 0x02bc, 0x0000, 0x02be,
-	// Entry 2C0 - 2FF
-	0x02be, 0x0000, 0x0000, 0x02c2, 0x0000, 0x02c4, 0x02c1, 0x02c1,
-	0x0000, 0x0000, 0x02c9, 0x02c8, 0x02c8, 0x0000, 0x0000, 0x02ce,
-	0x0000, 0x02d0, 0x0000, 0x02d2, 0x0000, 0x0000, 0x02d5, 0x0000,
-	0x0000, 0x0000, 0x02d9, 0x0000, 0x02db, 0x0000, 0x02dd, 0x0000,
-	0x02df, 0x02df, 0x0000, 0x02e2, 0x0000, 0x02e4, 0x0000, 0x02e6,
-	0x02e6, 0x02e6, 0x02e6, 0x02e6, 0x0000, 0x02ec, 0x02ed, 0x02ec,
-	0x0000, 0x02f0,
-} // Size: 1532 bytes
-
-// Total table size 1532 bytes (1KiB); checksum: 90718A2

vendor/golang.org/x/text/secure/doc.go

@@ -1,6 +0,0 @@
-// Copyright 2016 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// secure is a repository of text security related packages.
-package secure // import "golang.org/x/text/secure"

vendor/golang.org/x/text/unicode/doc.go

@@ -1,8 +0,0 @@
-// Copyright 2015 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// unicode holds packages with implementations of Unicode standards that are
-// mostly used as building blocks for other packages in golang.org/x/text,
-// layout engines, or are otherwise more low-level in nature.
-package unicode

vendor/google.golang.org/genproto/regen.go

@@ -1,123 +0,0 @@
-// Copyright 2016 Google Inc.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-// +build ignore
-
-// Regen.go regenerates the genproto repository.
-//
-// Regen.go recursively walks through each directory named by given arguments,
-// looking for all .proto files. (Symlinks are not followed.)
-// If the pkg_prefix flag is not an empty string,
-// any proto file without `go_package` option
-// or whose option does not begin with the prefix is ignored.
-// Protoc is executed on remaining files,
-// one invocation per set of files declaring the same Go package.
-package main
-
-import (
-	"flag"
-	"fmt"
-	"io/ioutil"
-	"log"
-	"os"
-	"os/exec"
-	"path/filepath"
-	"regexp"
-	"strconv"
-	"strings"
-)
-
-var goPkgOptRe = regexp.MustCompile(`(?m)^option go_package = (.*);`)
-
-func usage() {
-	fmt.Fprintln(os.Stderr, `usage: go run regen.go -go_out=path/to/output [-pkg_prefix=pkg/prefix] roots...
-
-Most users will not need to run this file directly.
-To regenerate this repository, run regen.sh instead.`)
-	flag.PrintDefaults()
-}
-
-func main() {
-	goOutDir := flag.String("go_out", "", "go_out argument to pass to protoc-gen-go")
-	pkgPrefix := flag.String("pkg_prefix", "", "only include proto files with go_package starting with this prefix")
-	flag.Usage = usage
-	flag.Parse()
-
-	if *goOutDir == "" {
-		log.Fatal("need go_out flag")
-	}
-
-	pkgFiles := make(map[string][]string)
-	walkFn := func(path string, info os.FileInfo, err error) error {
-		if err != nil {
-			return err
-		}
-		if !info.Mode().IsRegular() || !strings.HasSuffix(path, ".proto") {
-			return nil
-		}
-		pkg, err := goPkg(path)
-		if err != nil {
-			return err
-		}
-		pkgFiles[pkg] = append(pkgFiles[pkg], path)
-		return nil
-	}
-	for _, root := range flag.Args() {
-		if err := filepath.Walk(root, walkFn); err != nil {
-			log.Fatal(err)
-		}
-	}
-	for pkg, fnames := range pkgFiles {
-		if !strings.HasPrefix(pkg, *pkgPrefix) {
-			continue
-		}
-		if out, err := protoc(*goOutDir, flag.Args(), fnames); err != nil {
-			log.Fatalf("error executing protoc: %s\n%s", err, out)
-		}
-	}
-}
-
-// goPkg reports the import path declared in the given file's
-// `go_package` option. If the option is missing, goPkg returns empty string.
-func goPkg(fname string) (string, error) {
-	content, err := ioutil.ReadFile(fname)
-	if err != nil {
-		return "", err
-	}
-
-	var pkgName string
-	if match := goPkgOptRe.FindSubmatch(content); len(match) > 0 {
-		pn, err := strconv.Unquote(string(match[1]))
-		if err != nil {
-			return "", err
-		}
-		pkgName = pn
-	}
-	if p := strings.IndexRune(pkgName, ';'); p > 0 {
-		pkgName = pkgName[:p]
-	}
-	return pkgName, nil
-}
-
-// protoc executes the "protoc" command on files named in fnames,
-// passing go_out and include flags specified in goOut and includes respectively.
-// protoc returns combined output from stdout and stderr.
-func protoc(goOut string, includes, fnames []string) ([]byte, error) {
-	args := []string{"--go_out=plugins=grpc:" + goOut}
-	for _, inc := range includes {
-		args = append(args, "-I", inc)
-	}
-	args = append(args, fnames...)
-	return exec.Command("protoc", args...).CombinedOutput()
-}

vendor/google.golang.org/grpc/grpclb/grpc_lb_v1/doc.go

@@ -1,21 +0,0 @@
-/*
- *
- * Copyright 2017 gRPC authors.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- *
- */
-
-// Package grpc_lb_v1 is the parent package of all gRPC loadbalancer
-// message and service protobuf definitions.
-package grpc_lb_v1