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Support custom SSL certificates for the signal service (#2257)

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benniekiss 2024-07-16 14:44:21 -04:00 committed by GitHub
parent a711e116a3
commit 4fad0e521f
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2 changed files with 70 additions and 26 deletions
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2
signal/README.md
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@ -18,6 +18,8 @@ Flags:
--letsencrypt-domain string a domain to issue Let's Encrypt certificate for. Enables TLS using Let's Encrypt. Will fetch and renew certificate, and run the server with TLS
--port int Server port to listen on (e.g. 10000) (default 10000)
--ssl-dir string server ssl directory location. *Required only for Let's Encrypt certificates. (default "/var/lib/netbird/")
--cert-file string Location of your SSL certificate. Can be used when you have an existing certificate and don't want a new certificate be generated automatically. If letsencrypt-domain is specified this property has no effect
--cert-key string Location of your SSL certificate private key. Can be used when you have an existing certificate and don't want a new certificate be generated automatically. If letsencrypt-domain is specified this property has no effect
Global Flags:
--log-file string sets Netbird log path. If console is specified the the log will be output to stdout (default "/var/log/netbird/signal.log")

94
signal/cmd/run.go
View File

@ -2,6 +2,7 @@ package cmd
import (
"context"
"crypto/tls"
"errors"
"flag"
"fmt"
@ -41,7 +42,8 @@ var (
signalLetsencryptDomain string
signalSSLDir string
defaultSignalSSLDir string
tlsEnabled bool
signalCertFile string
signalCertKey string
signalKaep = grpc.KeepaliveEnforcementPolicy(keepalive.EnforcementPolicy{
MinTime: 5 * time.Second,
@ -59,9 +61,13 @@ var (
Use: "run",
Short: "start NetBird Signal Server daemon",
PreRun: func(cmd *cobra.Command, args []string) {
flag.Parse()
// detect whether user specified a port
userPort := cmd.Flag("port").Changed
if signalLetsencryptDomain != "" {
tlsEnabled := false
if signalLetsencryptDomain != "" || (signalCertFile != "" && signalCertKey != "") {
tlsEnabled = true
}
@ -93,14 +99,24 @@ var (
var opts []grpc.ServerOption
var certManager *autocert.Manager
if tlsEnabled {
// Let's encrypt enabled -> generate certificate automatically
var tlsConfig *tls.Config
if signalLetsencryptDomain != "" {
certManager, err = encryption.CreateCertManager(signalSSLDir, signalLetsencryptDomain)
if err != nil {
return err
}
transportCredentials := credentials.NewTLS(certManager.TLSConfig())
opts = append(opts, grpc.Creds(transportCredentials))
log.Infof("setting up TLS with LetsEncrypt.")
} else if signalCertFile != "" && signalCertKey != "" {
tlsConfig, err = loadTLSConfig(signalCertFile, signalCertKey)
if err != nil {
log.Errorf("cannot load TLS credentials: %v", err)
return err
}
transportCredentials := credentials.NewTLS(tlsConfig)
opts = append(opts, grpc.Creds(transportCredentials))
log.Infof("setting up TLS with custom certificates.")
}
metricsServer := metrics.NewServer(metricsPort, "")
@ -124,7 +140,34 @@ var (
}
proto.RegisterSignalExchangeServer(grpcServer, srv)
grpcRootHandler := grpcHandlerFunc(grpcServer)
var compatListener net.Listener
var grpcListener net.Listener
var httpListener net.Listener
if certManager != nil {
// a call to certManager.Listener() always creates a new listener so we do it once
httpListener := certManager.Listener()
if signalPort == 443 {
// running gRPC and HTTP cert manager on the same port
serveHTTP(httpListener, certManager.HTTPHandler(grpcRootHandler))
log.Infof("running HTTP server (LetsEncrypt challenge handler) and gRPC server on the same port: %s", httpListener.Addr().String())
} else {
// Start the HTTP cert manager server separately
serveHTTP(httpListener, certManager.HTTPHandler(nil))
log.Infof("running HTTP server (LetsEncrypt challenge handler): %s", httpListener.Addr().String())
}
}
// If certManager is configured and signalPort == 443, then the gRPC server has already been started
if certManager == nil || signalPort != 443 {
grpcListener, err = serveGRPC(grpcServer, signalPort)
if err != nil {
return err
}
log.Infof("running gRPC server: %s", grpcListener.Addr().String())
}
if signalPort != 10000 {
// The Signal gRPC server was running on port 10000 previously. Old agents that are already connected to Signal
// are using port 10000. For compatibility purposes we keep running a 2nd gRPC server on port 10000.
@ -135,28 +178,6 @@ var (
log.Infof("running gRPC backward compatibility server: %s", compatListener.Addr().String())
}
var grpcListener net.Listener
var httpListener net.Listener
if tlsEnabled {
httpListener = certManager.Listener()
if signalPort == 443 {
// running gRPC and HTTP cert manager on the same port
serveHTTP(httpListener, certManager.HTTPHandler(grpcHandlerFunc(grpcServer)))
log.Infof("running HTTP server (LetsEncrypt challenge handler) and gRPC server on the same port: %s", httpListener.Addr().String())
} else {
serveHTTP(httpListener, certManager.HTTPHandler(nil))
log.Infof("running HTTP server (LetsEncrypt challenge handler): %s", httpListener.Addr().String())
}
}
if signalPort != 443 || !tlsEnabled {
grpcListener, err = serveGRPC(grpcServer, signalPort)
if err != nil {
return err
}
log.Infof("running gRPC server: %s", grpcListener.Addr().String())
}
log.Infof("signal server version %s", version.NetbirdVersion())
log.Infof("started Signal Service")
@ -232,6 +253,25 @@ func serveGRPC(grpcServer *grpc.Server, port int) (net.Listener, error) {
return listener, nil
}
func loadTLSConfig(certFile string, certKey string) (*tls.Config, error) {
// Load server's certificate and private key
serverCert, err := tls.LoadX509KeyPair(certFile, certKey)
if err != nil {
return nil, err
}
// NewDefaultAppMetrics the credentials and return it
config := &tls.Config{
Certificates: []tls.Certificate{serverCert},
ClientAuth: tls.NoClientCert,
NextProtos: []string{
"h2", "http/1.1", // enable HTTP/2
},
}
return config, nil
}
func cpFile(src, dst string) error {
var err error
var srcfd *os.File
@ -323,4 +363,6 @@ func init() {
runCmd.PersistentFlags().IntVar(&signalPort, "port", 80, "Server port to listen on (defaults to 443 if TLS is enabled, 80 otherwise")
runCmd.Flags().StringVar(&signalSSLDir, "ssl-dir", defaultSignalSSLDir, "server ssl directory location. *Required only for Let's Encrypt certificates.")
runCmd.Flags().StringVar(&signalLetsencryptDomain, "letsencrypt-domain", "", "a domain to issue Let's Encrypt certificate for. Enables TLS using Let's Encrypt. Will fetch and renew certificate, and run the server with TLS")
runCmd.Flags().StringVar(&signalCertFile, "cert-file", "", "Location of your SSL certificate. Can be used when you have an existing certificate and don't want a new certificate be generated automatically. If letsencrypt-domain is specified this property has no effect")
runCmd.Flags().StringVar(&signalCertKey, "cert-key", "", "Location of your SSL certificate private key. Can be used when you have an existing certificate and don't want a new certificate be generated automatically. If letsencrypt-domain is specified this property has no effect")
}