etcdmain: add "--cipher-suites" flag

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

etcdmain/config.go

@@ -208,6 +208,7 @@ func newConfig() *config {
 	fs.BoolVar(&cfg.ec.PeerAutoTLS, "peer-auto-tls", false, "Peer TLS using generated certificates")
 	fs.StringVar(&cfg.ec.PeerTLSInfo.CRLFile, "peer-crl-file", "", "Path to the peer certificate revocation list file.")
 	fs.StringVar(&cfg.ec.PeerTLSInfo.AllowedCN, "peer-cert-allowed-cn", "", "Allowed CN for inter peer authentication.")
+	fs.Var(flags.NewStringsValue(""), "cipher-suites", "Comma-separated list of supported TLS cipher suites between client/server and peers (empty will be auto-populated by Go).")
 
 	fs.Var(
 		flags.NewUniqueURLsWithExceptions("*", "*"),
@@ -309,6 +310,8 @@ func (cfg *config) configFromCmdLine() error {
 	cfg.ec.CORS = flags.UniqueURLsMapFromFlag(cfg.cf.flagSet, "cors")
 	cfg.ec.HostWhitelist = flags.UniqueStringsMapFromFlag(cfg.cf.flagSet, "host-whitelist")
 
+	cfg.ec.CipherSuites = flags.StringsFromFlag(cfg.cf.flagSet, "cipher-suites")
+
 	// TODO: remove this in v3.5
 	output := flags.UniqueStringsMapFromFlag(cfg.cf.flagSet, "log-output")
 	oss1 := make([]string, 0, len(output))

etcdmain/help.go

@@ -142,6 +142,8 @@ Security:
     Peer TLS using self-generated certificates if --peer-key-file and --peer-cert-file are not provided.
   --peer-crl-file ''
     Path to the peer certificate revocation list file.
+  --cipher-suites ''
+    Comma-separated list of supported TLS cipher suites between client/server and peers (empty will be auto-populated by Go).
   --cors '*'
     Comma-separated whitelist of origins for CORS, or cross-origin resource sharing, (empty or * means allow all).
   --host-whitelist '*'