Restrict the Chromoting client plugin to use by extensions & apps.

BUG=160456


Review URL: https://chromiumcodereview.appspot.com/11365276

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@168289 0039d316-1c4b-4281-b951-d872f2087c98

remoting/client/plugin/chromoting_instance.cc

@@ -23,6 +23,7 @@
 #include "media/base/media.h"
 #include "net/socket/ssl_server_socket.h"
 #include "ppapi/cpp/completion_callback.h"
+#include "ppapi/cpp/dev/url_util_dev.h"
 #include "ppapi/cpp/input_event.h"
 #include "ppapi/cpp/mouse_cursor.h"
 #include "ppapi/cpp/rect.h"
@@ -55,6 +56,9 @@ const int kBytesPerPixel = 4;
 
 const int kPerfStatsIntervalMs = 1000;
 
+// URL scheme used by Chrome apps and extensions.
+const char kChromeExtensionUrlScheme[] = "chrome-extension";
+
 std::string ConnectionStateToString(protocol::ConnectionToHost::State state) {
   // Values returned by this function must match the
   // remoting.ClientSession.State enum in JS code.
@@ -217,6 +221,12 @@ bool ChromotingInstance::Init(uint32_t argc,
     return false;
   }
 
+  // Check that the calling content is part of an app or extension.
+  if (!IsCallerAppOrExtension()) {
+    LOG(ERROR) << "Not an app or extension";
+    return false;
+  }
+
   // Enable support for SSL server sockets, which must be done as early as
   // possible, preferably before any NSS SSL sockets (client or server) have
   // been created.
@@ -754,6 +764,22 @@ void ChromotingInstance::ProcessLogToUI(const std::string& message) {
   g_logging_to_plugin = false;
 }
 
+bool ChromotingInstance::IsCallerAppOrExtension() {
+  const pp::URLUtil_Dev* url_util = pp::URLUtil_Dev::Get();
+  if (!url_util)
+    return false;
+
+  PP_URLComponents_Dev url_components;
+  pp::Var url_var = url_util->GetDocumentURL(this, &url_components);
+  if (!url_var.is_string())
+    return false;
+
+  std::string url = url_var.AsString();
+  std::string url_scheme = url.substr(url_components.scheme.begin,
+                                      url_components.scheme.len);
+  return url_scheme == kChromeExtensionUrlScheme;
+}
+
 bool ChromotingInstance::IsConnected() {
   return host_connection_.get() &&
     (host_connection_->state() == protocol::ConnectionToHost::CONNECTED);

remoting/client/plugin/chromoting_instance.h

@@ -177,6 +177,9 @@ class ChromotingInstance :
 
   void ProcessLogToUI(const std::string& message);
 
+  // Returns true if the hosting content has the chrome-extension:// scheme.
+  bool IsCallerAppOrExtension();
+
   // Returns true if there is a ConnectionToHost and it is connected.
   bool IsConnected();