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Add support for X11 forwarding #829

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Add support for X11 forwarding #829

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18 changes: 18 additions & 0 deletions pkg/ssh/server/ssh.go
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Original file line number Diff line number Diff line change
Expand Up @@ -64,6 +64,9 @@ func NewServer(addr string, hostKey []byte, keys []ssh.PublicKey, workdir string

return true
},
X11ForwardingCallback: func(ctx ssh.Context, x11 ssh.X11) bool {
return true
},
ChannelHandlers: map[string]ssh.ChannelHandler{
"direct-tcpip": ssh.DirectTCPIPHandler,
"[email protected]": ssh.DirectStreamLocalHandler,
Expand Down Expand Up @@ -171,6 +174,7 @@ func getShell() ([]string, error) {

func (s *Server) handler(sess ssh.Session) {
ptyReq, winCh, isPty := sess.Pty()
x11Req, isX11 := sess.X11()
cmd := s.getCommand(sess, isPty)
if ssh.AgentRequested(sess) {
// on some systems (like containers) /tmp may not exists, this ensures
Expand All @@ -191,6 +195,20 @@ func (s *Server) handler(sess ssh.Session) {
cmd.Env = append(cmd.Env, fmt.Sprintf("%s=%s", "SSH_AUTH_SOCK", l.Addr().String()))
}

if isX11 {
l, xauth, err := ssh.NewX11Forwarder(x11Req)
if err != nil {
s.exitWithError(sess, perrors.Wrap(err, "start X11 forwarder"))
return
}

defer l.Close()
defer os.Remove(xauth.Name())
go ssh.ForwardX11Connections(l, xauth, sess)
cmd.Env = append(cmd.Env, fmt.Sprintf("%s=%s:%d.0", "DISPLAY", ssh.X11DisplayHost, l.Addr().(*net.TCPAddr).Port - ssh.X11DisplayBasePort))
cmd.Env = append(cmd.Env, fmt.Sprintf("%s=%s", "XAUTHORITY", xauth.Name()))
}

// start shell session
var err error
if isPty {
Expand Down