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Merge pull request #822 from yggdrasil-network/sni
TLS Server Name Indication
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commit
f92d812f3c
@ -98,6 +98,22 @@ func (l *links) call(u *url.URL, sintf string) error {
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l.tcp.call(pathtokens[0], tcpOpts, sintf)
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case "tls":
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tcpOpts.upgrade = l.tcp.tls.forDialer
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// SNI headers must contain hostnames and not IP addresses, so we must make sure
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// that we do not populate the SNI with an IP literal. We do this by splitting
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// the host-port combo from the query option and then seeing if it parses to an
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// IP address successfully or not.
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if sni := u.Query().Get("sni"); sni != "" {
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if net.ParseIP(sni) == nil {
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tcpOpts.tlsSNI = sni
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}
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}
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// If the SNI is not configured still because the above failed then we'll try
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// again but this time we'll use the host part of the peering URI instead.
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if tcpOpts.tlsSNI == "" {
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if host, _, err := net.SplitHostPort(u.Host); err == nil && net.ParseIP(host) == nil {
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tcpOpts.tlsSNI = host
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}
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}
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l.tcp.call(u.Host, tcpOpts, sintf)
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default:
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return errors.New("unknown call scheme: " + u.Scheme)
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@ -64,6 +64,7 @@ type tcpOptions struct {
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socksProxyAddr string
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socksProxyAuth *proxy.Auth
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socksPeerAddr string
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tlsSNI string
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}
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func (l *TcpListener) Stop() {
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@ -78,7 +78,7 @@ func (t *tcptls) init(tcp *tcp) {
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}
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func (t *tcptls) configForOptions(options *tcpOptions) *tls.Config {
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config := *t.config
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config := t.config.Clone()
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config.VerifyPeerCertificate = func(rawCerts [][]byte, _ [][]*x509.Certificate) error {
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if len(rawCerts) != 1 {
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return errors.New("tls not exactly 1 cert")
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@ -103,7 +103,7 @@ func (t *tcptls) configForOptions(options *tcpOptions) *tls.Config {
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}
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return nil
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}
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return &config
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return config
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}
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func (t *tcptls) upgradeListener(c net.Conn, options *tcpOptions) (net.Conn, error) {
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@ -117,6 +117,7 @@ func (t *tcptls) upgradeListener(c net.Conn, options *tcpOptions) (net.Conn, err
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func (t *tcptls) upgradeDialer(c net.Conn, options *tcpOptions) (net.Conn, error) {
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config := t.configForOptions(options)
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config.ServerName = options.tlsSNI
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conn := tls.Client(c, config)
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if err := conn.Handshake(); err != nil {
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return c, err
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