integration: test client-side TLS cipher suites

Signed-off-by: Gyuho Lee <gyuhox@gmail.com>

integration/v3_tls_test.go

@@ -0,0 +1,71 @@
+// Copyright 2018 The etcd 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 integration
+
+import (
+	"context"
+	"crypto/tls"
+	"testing"
+	"time"
+
+	"github.com/coreos/etcd/clientv3"
+	"github.com/coreos/etcd/pkg/testutil"
+)
+
+func TestTLSClientCipherSuitesValid(t *testing.T)    { testTLSCipherSuites(t, true) }
+func TestTLSClientCipherSuitesMismatch(t *testing.T) { testTLSCipherSuites(t, false) }
+
+// testTLSCipherSuites ensures mismatching client-side cipher suite
+// fail TLS handshake with the server.
+func testTLSCipherSuites(t *testing.T, valid bool) {
+	defer testutil.AfterTest(t)
+
+	cipherSuites := []uint16{
+		tls.TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,
+		tls.TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,
+		tls.TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
+		tls.TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,
+		tls.TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305,
+		tls.TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305,
+	}
+	srvTLS, cliTLS := testTLSInfo, testTLSInfo
+	if valid {
+		srvTLS.CipherSuites, cliTLS.CipherSuites = cipherSuites, cipherSuites
+	} else {
+		srvTLS.CipherSuites, cliTLS.CipherSuites = cipherSuites[:2], cipherSuites[2:]
+	}
+
+	clus := NewClusterV3(t, &ClusterConfig{Size: 1, ClientTLS: &srvTLS})
+	defer clus.Terminate(t)
+
+	cc, err := cliTLS.ClientConfig()
+	if err != nil {
+		t.Fatal(err)
+	}
+	cli, cerr := clientv3.New(clientv3.Config{
+		Endpoints:   []string{clus.Members[0].GRPCAddr()},
+		DialTimeout: time.Second,
+		TLS:         cc,
+	})
+	if cli != nil {
+		cli.Close()
+	}
+	if !valid && cerr != context.DeadlineExceeded {
+		t.Fatalf("expected %v with TLS handshake failure, got %v", context.DeadlineExceeded, cerr)
+	}
+	if valid && cerr != nil {
+		t.Fatalf("expected TLS handshake success, got %v", cerr)
+	}
+}