PlzNavigate: Enforce 'frame-src' CSP on the browser.

third_party/WebKit/Source/core/loader/FrameLoader.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights
  * reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved.
  * (http://www.torchmobile.com/)
  * Copyright (C) 2008 Alp Toker <alp@atoker.com>
  * Copyright (C) Research In Motion Limited 2009. All rights reserved.
  * Copyright (C) 2011 Kris Jordan <krisjordan@gmail.com>
  * Copyright (C) 2011 Google Inc. All rights reserved.
@@ skipping 1642 matching lines @@
     ContentSecurityPolicyDisposition shouldCheckMainWorldContentSecurityPolicy,
     NavigationType type,
     NavigationPolicy policy,
     FrameLoadType frameLoadType,
     bool isClientRedirect,
     HTMLFormElement* form) {
   // Don't ask if we are loading an empty URL.
   if (request.url().isEmpty() || substituteData.isValid())
     return NavigationPolicyCurrentTab;
 
+  Settings* settings = m_frame->settings();
+  bool browserSideNavigationEnabled =
+      settings && settings->getBrowserSideNavigationEnabled();
+
   // If we're loading content into |m_frame| (NavigationPolicyCurrentTab), check
   // against the parent's Content Security Policy and kill the load if that
   // check fails, unless we should bypass the main world's CSP.
   if (policy == NavigationPolicyCurrentTab &&
-      shouldCheckMainWorldContentSecurityPolicy == CheckContentSecurityPolicy) {
+      shouldCheckMainWorldContentSecurityPolicy == CheckContentSecurityPolicy &&
+      // TODO(arthursonzogni): 'frame-src' check is disabled on the
+      // renderer side with browser-side-navigation, but is enforced on the
+      // browser side. See http://crbug.com/692595 for understanding why it
+      // can't be enforced on both sides instead.
+      !browserSideNavigationEnabled) {
     Frame* parentFrame = m_frame->tree().parent();
     if (parentFrame) {
       ContentSecurityPolicy* parentPolicy =
           parentFrame->securityContext()->contentSecurityPolicy();
       if (!parentPolicy->allowFrameFromSource(request.url(),
                                               request.redirectStatus())) {
         // Fire a load event, as timing attacks would otherwise reveal that the
         // frame was blocked. This way, it looks like every other cross-origin
         // page load.
         m_frame->document()->enforceSandboxFlags(SandboxOrigin);
         m_frame->owner()->dispatchLoad();
         return NavigationPolicyIgnore;
       }
     }
   }
 
   bool isFormSubmission = type == NavigationTypeFormSubmitted ||
                           type == NavigationTypeFormResubmitted;
   if (isFormSubmission &&
       !m_frame->document()->contentSecurityPolicy()->allowFormAction(
           request.url(), request.redirectStatus())) {
     return NavigationPolicyIgnore;
   }
 
   bool replacesCurrentHistoryItem =
       frameLoadType == FrameLoadTypeReplaceCurrentItem;
-  policy = client()->decidePolicyForNavigation(request, loader, type, policy,
-                                               replacesCurrentHistoryItem,
-                                               isClientRedirect, form);
+  policy = client()->decidePolicyForNavigation(
+      request, loader, type, policy, replacesCurrentHistoryItem,
+      isClientRedirect, form, shouldCheckMainWorldContentSecurityPolicy);
   if (policy == NavigationPolicyCurrentTab ||
       policy == NavigationPolicyIgnore ||
       policy == NavigationPolicyHandledByClient ||
       policy == NavigationPolicyHandledByClientForInitialHistory) {
     return policy;
   }
 
   if (!LocalDOMWindow::allowPopUp(*m_frame) &&
       !UserGestureIndicator::utilizeUserGesture())
     return NavigationPolicyIgnore;
@@ skipping 312 matching lines @@
       frameLoadRequest.clientRedirect());
 
   loader->setLoadType(loadType);
   loader->setNavigationType(navigationType);
   loader->setReplacesCurrentHistoryItem(loadType ==
                                         FrameLoadTypeReplaceCurrentItem);
   return loader;
 }
 
 }  // namespace blink