Add scheme exceptions for isSecureContext

third_party/WebKit/Source/core/dom/Document.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2008, 2009, 2011, 2012 Google Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) Research In Motion Limited 2010-2011. All rights reserved.
@@ skipping 5649 matching lines @@
 {
     wrapper = V8DOMWrapper::associateObjectWithWrapper(isolate, this, wrapperType, wrapper);
     DOMWrapperWorld& world = DOMWrapperWorld::current(isolate);
     if (world.isMainWorld() && frame())
         frame()->script().windowProxy(world)->updateDocumentWrapper(wrapper);
     return wrapper;
 }
 
 bool Document::isSecureContext(String& errorMessage, const SecureContextCheck privilegeContextCheck) const
 {
+    // There may be exceptions for the secure context check defined for certain
+    // schemes. The exceptions are applied only to the special scheme and to
+    // sandboxed URLs from those origins, but *not* to any children.
+    //
+    // For example:
+    //   <iframe src="http://host">
+    //     <iframe src="scheme-has-exception://host"></iframe>
+    //     <iframe sandbox src="scheme-has-exception://host"></iframe>
+    //   </iframe>
+    // both inner iframes pass this check, assuming that the scheme
+    // "scheme-has-exception:" is granted an exception.
+    //
+    // However,
+    //   <iframe src="http://host">
+    //     <iframe sandbox src="http://host"></iframe>
+    //   </iframe>
+    // would fail the check (that is, sandbox does not grant an exception itself).
+    //
+    // Additionally, with
+    //   <iframe src="scheme-has-exception://host">
+    //     <iframe src="http://host"></iframe>
+    //     <iframe sandbox src="http://host"></iframe>
+    //   </iframe>
+    // both inner iframes would fail the check, even though the outermost iframe
+    // passes.
+    //
+    // In all cases, a frame must be potentially trustworthy in addition to
+    // having an exception listed in order for the exception to be granted.
     if (SecurityContext::isSandboxed(SandboxOrigin)) {
-        if (!SecurityOrigin::create(url())->isPotentiallyTrustworthy(errorMessage))
+        RefPtr<SecurityOrigin> origin = SecurityOrigin::create(url());
+        if (!origin->isPotentiallyTrustworthy(errorMessage))
             return false;
+        if (SchemeRegistry::schemeShouldBypassSecureContextCheck(origin->protocol()))
+            return true;
     } else {
         if (!securityOrigin()->isPotentiallyTrustworthy(errorMessage))
             return false;
+        if (SchemeRegistry::schemeShouldBypassSecureContextCheck(securityOrigin()->protocol()))
+            return true;
     }
 
     if (privilegeContextCheck == StandardSecureContextCheck) {
         Document* context = parentDocument();
         while (context) {
             // Skip to the next ancestor if it's a srcdoc.
             if (!context->isSrcdocDocument()) {
                 if (context->securityContext().isSandboxed(SandboxOrigin)) {
                     // For a sandboxed origin, use the document's URL.
                     RefPtr<SecurityOrigin> origin = SecurityOrigin::create(context->url());
@@ skipping 89 matching lines @@
 #ifndef NDEBUG
 using namespace blink;
 void showLiveDocumentInstances()
 {
     Document::WeakDocumentSet& set = Document::liveDocumentSet();
     fprintf(stderr, "There are %u documents currently alive:\n", set.size());
     for (Document* document : set)
         fprintf(stderr, "- Document %p URL: %s\n", document, document->url().string().utf8().data());
 }
 #endif