*: add self-signed-cert-validity flag

Documentation/op-guide/security.md

@@ -197,7 +197,6 @@ The etcd members will form a cluster and all communication between members in th
 ## Example 4: Automatic self-signed transport security
 
 For cases where communication encryption, but not authentication, is needed, etcd supports encrypting its messages with automatically generated self-signed certificates. This simplifies deployment because there is no need for managing certificates and keys outside of etcd.
-
 Configure etcd to use self-signed certificates for client and peer connections with the flags `--auto-tls` and `--peer-auto-tls`:
 
 ```sh

pkg/transport/listener.go

@@ -114,8 +114,16 @@ func (info TLSInfo) Empty() bool {
 	return info.CertFile == "" && info.KeyFile == ""
 }
 
-func SelfCert(lg *zap.Logger, dirpath string, hosts []string, additionalUsages ...x509.ExtKeyUsage) (info TLSInfo, err error) {
+func SelfCert(lg *zap.Logger, dirpath string, hosts []string, selfSignedCertValidity uint, additionalUsages ...x509.ExtKeyUsage) (info TLSInfo, err error) {
 	info.Logger = lg
+	if selfSignedCertValidity == 0 {
+		err = fmt.Errorf("selfSignedCertValidity is invalid,it should be greater than 0")
+		info.Logger.Warn(
+			"cannot generate cert",
+			zap.Error(err),
+		)
+		return
+	}
 	err = fileutil.TouchDirAll(dirpath)
 	if err != nil {
 		if info.Logger != nil {
@@ -154,13 +162,20 @@ func SelfCert(lg *zap.Logger, dirpath string, hosts []string, additionalUsages .
 		SerialNumber: serialNumber,
 		Subject:      pkix.Name{Organization: []string{"etcd"}},
 		NotBefore:    time.Now(),
-		NotAfter:     time.Now().Add(365 * (24 * time.Hour)),
+		NotAfter:     time.Now().Add(time.Duration(selfSignedCertValidity) * 365 * (24 * time.Hour)),
 
 		KeyUsage:              x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature,
 		ExtKeyUsage:           append([]x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth}, additionalUsages...),
 		BasicConstraintsValid: true,
 	}
 
+	if info.Logger != nil {
+		info.Logger.Warn(
+			"automatically generate certificates",
+			zap.Time("certificate-validity-bound-not-after", tmpl.NotAfter),
+		)
+	}
+
 	for _, host := range hosts {
 		h, _, _ := net.SplitHostPort(host)
 		if ip := net.ParseIP(h); ip != nil {
@@ -227,7 +242,7 @@ func SelfCert(lg *zap.Logger, dirpath string, hosts []string, additionalUsages .
 	if info.Logger != nil {
 		info.Logger.Info("created key file", zap.String("path", keyPath))
 	}
-	return SelfCert(lg, dirpath, hosts)
+	return SelfCert(lg, dirpath, hosts, selfSignedCertValidity)
 }
 
 // baseConfig is called on initial TLS handshake start.

pkg/transport/listener_test.go

@@ -37,7 +37,7 @@ func createSelfCertEx(host string, additionalUsages ...x509.ExtKeyUsage) (*TLSIn
 	if terr != nil {
 		return nil, nil, terr
 	}
-	info, err := SelfCert(zap.NewExample(), d, []string{host + ":0"}, additionalUsages...)
+	info, err := SelfCert(zap.NewExample(), d, []string{host + ":0"}, 1, additionalUsages...)
 	if err != nil {
 		return nil, nil, err
 	}
@@ -366,7 +366,7 @@ func TestNewListenerTLSInfoSelfCert(t *testing.T) {
 		t.Fatal(err)
 	}
 	defer os.RemoveAll(tmpdir)
-	tlsinfo, err := SelfCert(zap.NewExample(), tmpdir, []string{"127.0.0.1"})
+	tlsinfo, err := SelfCert(zap.NewExample(), tmpdir, []string{"127.0.0.1"}, 1)
 	if err != nil {
 		t.Fatal(err)
 	}

server/embed/config.go

@@ -184,6 +184,10 @@ type Config struct {
 	ClientAutoTLS  bool
 	PeerTLSInfo    transport.TLSInfo
 	PeerAutoTLS    bool
+	// SelfSignedCertValidity specifies the validity period of the client and peer certificates
+	// that are automatically generated by etcd when you specify ClientAutoTLS and PeerAutoTLS,
+	// the unit is year, and the default is 1
+	SelfSignedCertValidity uint
 
 	// CipherSuites is a list of supported TLS cipher suites between
 	// client/server and peers. If empty, Go auto-populates the list.
@@ -731,7 +735,7 @@ func (cfg *Config) ClientSelfCert() (err error) {
 	for i, u := range cfg.LCUrls {
 		chosts[i] = u.Host
 	}
-	cfg.ClientTLSInfo, err = transport.SelfCert(cfg.logger, filepath.Join(cfg.Dir, "fixtures", "client"), chosts)
+	cfg.ClientTLSInfo, err = transport.SelfCert(cfg.logger, filepath.Join(cfg.Dir, "fixtures", "client"), chosts, cfg.SelfSignedCertValidity)
 	if err != nil {
 		return err
 	}
@@ -750,7 +754,7 @@ func (cfg *Config) PeerSelfCert() (err error) {
 	for i, u := range cfg.LPUrls {
 		phosts[i] = u.Host
 	}
-	cfg.PeerTLSInfo, err = transport.SelfCert(cfg.logger, filepath.Join(cfg.Dir, "fixtures", "peer"), phosts)
+	cfg.PeerTLSInfo, err = transport.SelfCert(cfg.logger, filepath.Join(cfg.Dir, "fixtures", "peer"), phosts, cfg.SelfSignedCertValidity)
 	if err != nil {
 		return err
 	}

server/etcdmain/config.go

@@ -207,6 +207,7 @@ func newConfig() *config {
 	fs.BoolVar(&cfg.ec.PeerTLSInfo.ClientCertAuth, "peer-client-cert-auth", false, "Enable peer client cert authentication.")
 	fs.StringVar(&cfg.ec.PeerTLSInfo.TrustedCAFile, "peer-trusted-ca-file", "", "Path to the peer server TLS trusted CA file.")
 	fs.BoolVar(&cfg.ec.PeerAutoTLS, "peer-auto-tls", false, "Peer TLS using generated certificates")
+	fs.UintVar(&cfg.ec.SelfSignedCertValidity, "self-signed-cert-validity", 1, "The validity period of the client and peer certificates, unit is year")
 	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.StringVar(&cfg.ec.PeerTLSInfo.AllowedHostname, "peer-cert-allowed-hostname", "", "Allowed TLS hostname for inter peer authentication.")

server/etcdmain/etcd.go

@@ -393,7 +393,7 @@ func startProxy(cfg *config) error {
 	}
 	listenerTLS := cfg.ec.ClientTLSInfo
 	if cfg.ec.ClientAutoTLS && cTLS {
-		listenerTLS, err = transport.SelfCert(cfg.ec.GetLogger(), filepath.Join(cfg.ec.Dir, "clientCerts"), cHosts)
+		listenerTLS, err = transport.SelfCert(cfg.ec.GetLogger(), filepath.Join(cfg.ec.Dir, "clientCerts"), cHosts, cfg.ec.SelfSignedCertValidity)
 		if err != nil {
 			lg.Fatal("failed to initialize self-signed client cert", zap.Error(err))
 		}

server/etcdmain/grpc_proxy.go

@@ -76,6 +76,7 @@ var (
 	grpcProxyListenKey     string
 	grpcProxyListenAutoTLS bool
 	grpcProxyListenCRL     string
+	selfSignedCertValidity uint
 
 	grpcProxyAdvertiseClientURL string
 	grpcProxyResolverPrefix     string
@@ -149,6 +150,7 @@ func newGRPCProxyStartCommand() *cobra.Command {
 	cmd.Flags().StringVar(&grpcProxyListenCA, "trusted-ca-file", "", "verify certificates of TLS-enabled secure proxy using this CA bundle")
 	cmd.Flags().BoolVar(&grpcProxyListenAutoTLS, "auto-tls", false, "proxy TLS using generated certificates")
 	cmd.Flags().StringVar(&grpcProxyListenCRL, "client-crl-file", "", "proxy client certificate revocation list file.")
+	cmd.Flags().UintVar(&selfSignedCertValidity, "self-signed-cert-validity", 1, "The validity period of the proxy certificates, unit is year")
 
 	// experimental flags
 	cmd.Flags().BoolVar(&grpcProxyEnableOrdering, "experimental-serializable-ordering", false, "Ensure serializable reads have monotonically increasing store revisions across endpoints.")
@@ -189,7 +191,7 @@ func startGRPCProxy(cmd *cobra.Command, args []string) {
 	if tlsinfo == nil && grpcProxyListenAutoTLS {
 		host := []string{"https://" + grpcProxyListenAddr}
 		dir := filepath.Join(grpcProxyDataDir, "fixtures", "proxy")
-		autoTLS, err := transport.SelfCert(lg, dir, host)
+		autoTLS, err := transport.SelfCert(lg, dir, host, selfSignedCertValidity)
 		if err != nil {
 			log.Fatal(err)
 		}
@@ -254,6 +256,10 @@ func checkArgs() {
 		fmt.Fprintln(os.Stderr, fmt.Errorf("invalid advertise-client-url %q", grpcProxyAdvertiseClientURL))
 		os.Exit(1)
 	}
+	if grpcProxyListenAutoTLS && selfSignedCertValidity == 0 {
+		fmt.Fprintln(os.Stderr, fmt.Errorf("selfSignedCertValidity is invalid,it should be greater than 0"))
+		os.Exit(1)
+	}
 }
 
 func mustNewClient(lg *zap.Logger) *clientv3.Client {

server/etcdmain/help.go

@@ -150,6 +150,8 @@ Security:
     Allowed TLS hostname for inter peer authentication.
   --peer-auto-tls 'false'
     Peer TLS using self-generated certificates if --peer-key-file and --peer-cert-file are not provided.
+  --self-signed-cert-validity '1'
+    The validity period of the client and peer certificates that are automatically generated by etcd when you specify ClientAutoTLS and PeerAutoTLS, the unit is year, and the default is 1.
   --peer-crl-file ''
     Path to the peer certificate revocation list file.
   --cipher-suites ''