Add gnubby authentication to remoting host

remoting/host/client_session.cc

Index: remoting/host/client_session.cc
diff --git a/remoting/host/client_session.cc b/remoting/host/client_session.cc
index 52feba70462efae8bc4d28cce9f9f09cd605d073..a190aa52c0543b5e22840b11024809800b9d6932 100644
--- a/remoting/host/client_session.cc
+++ b/remoting/host/client_session.cc
@@ -45,7 +45,8 @@ ClientSession::ClientSession(
     scoped_ptr<protocol::ConnectionToClient> connection,
     DesktopEnvironmentFactory* desktop_environment_factory,
     const base::TimeDelta& max_duration,
-    scoped_refptr<protocol::PairingRegistry> pairing_registry)
+    scoped_refptr<protocol::PairingRegistry> pairing_registry,
+    bool enable_gnubby_auth)
     : event_handler_(event_handler),
       connection_(connection.Pass()),
       client_jid_(connection_->session()->jid()),
@@ -66,7 +67,8 @@ ClientSession::ClientSession(
       video_encode_task_runner_(video_encode_task_runner),
       network_task_runner_(network_task_runner),
       ui_task_runner_(ui_task_runner),
-      pairing_registry_(pairing_registry) {
+      pairing_registry_(pairing_registry),
+      enable_gnubby_auth_(enable_gnubby_auth) {
   connection_->SetEventHandler(this);
 
   // TODO(sergeyu): Currently ConnectionToClient expects stubs to be
@@ -197,9 +199,15 @@ void ClientSession::DeliverClientMessage(
         reply.set_data(message.data().substr(0, 16));
       connection_->client_stub()->DeliverHostMessage(reply);
       return;
+    } else if (message.type() == "gnubby-auth") {
+      if (gnubby_auth_handler_) {
+        gnubby_auth_handler_->DeliverClientMessage(message.data());
+      } else {
+        HOST_LOG << "gnubby auth is not enabled";
+      }
+      return;
     }
   }
-  // No messages are currently supported.
   HOST_LOG << "Unexpected message received: "
             << message.type() << ": " << message.data();
 }
@@ -288,6 +296,12 @@ void ClientSession::OnConnectionAuthenticated(
         audio_encoder.Pass(),
         connection_->audio_stub());
   }
+
+  if (enable_gnubby_auth_) {
+    // Create a GnubbyAuthHandler to proxy gnubbyd messages.
+    gnubby_auth_handler_.reset(
+        new GnubbyAuthHandler(connection_->client_stub()));
+  }
 }
 
 void ClientSession::OnConnectionChannelsConnected(
@@ -412,6 +426,11 @@ void ClientSession::SetDisableInputs(bool disable_inputs) {
   disable_clipboard_filter_.set_enabled(!disable_inputs);
 }
 
+void ClientSession::SetGnubbyAuthHandlerForTesting(
+    GnubbyAuthHandler* gnubby_auth_handler) {
+  gnubby_auth_handler_.reset(gnubby_auth_handler);
+}
+
 scoped_ptr<protocol::ClipboardStub> ClientSession::CreateClipboardProxy() {
   DCHECK(CalledOnValidThread());