Implementation of subresource integrity attribute for secure origins.

Source/core/dom/ScriptLoader.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nikolas Zimmermann <zimmermann@kde.org>
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
@@ skipping 24 matching lines @@
 #include "core/dom/ScriptRunner.h"
 #include "core/dom/ScriptableDocumentParser.h"
 #include "core/dom/Text.h"
 #include "core/fetch/FetchRequest.h"
 #include "core/fetch/ResourceFetcher.h"
 #include "core/fetch/ScriptResource.h"
 #include "core/html/HTMLScriptElement.h"
 #include "core/html/imports/HTMLImport.h"
 #include "core/html/parser/HTMLParserIdioms.h"
 #include "core/frame/LocalFrame.h"
+#include "core/frame/SubresourceIntegrity.h"
 #include "core/frame/csp/ContentSecurityPolicy.h"
 #include "core/inspector/ConsoleMessage.h"
 #include "core/svg/SVGScriptElement.h"
 #include "platform/MIMETypeRegistry.h"
 #include "platform/weborigin/SecurityOrigin.h"
 #include "wtf/StdLibExtras.h"
 #include "wtf/text/StringBuilder.h"
 #include "wtf/text/StringHash.h"
 
 namespace blink {
@@ skipping 260 matching lines @@
 
     if (!m_isExternalScript && (!shouldBypassMainWorldCSP && !csp->allowInlineScript(elementDocument->url(), m_startLineNumber)))
         return;
 
     if (m_isExternalScript) {
         ScriptResource* resource = m_resource ? m_resource.get() : sourceCode.resource();
         if (resource && !resource->mimeTypeAllowedByNosniff()) {
             contextDocument->addConsoleMessage(ConsoleMessage::create(SecurityMessageSource, ErrorMessageLevel, "Refused to execute script from '" + resource->url().elidedString() + "' because its MIME type ('" + resource->mimeType() + "') is not executable, and strict MIME type checking is enabled."));
             return;
         }
+
+        // FIXME: On failure, SRI should probably provide an error message for the console.
+        if (!SubresourceIntegrity::CheckSubresourceIntegrity(*m_element, sourceCode.source(), sourceCode.resource()->url()))
+            return;
     }
 
     // FIXME: Can this be moved earlier in the function?
     // Why are we ever attempting to execute scripts without a frame?
     if (!frame)
         return;
 
     const bool isImportedScript = contextDocument != elementDocument;
     // http://www.whatwg.org/specs/web-apps/current-work/#execute-the-script-block step 2.3
     // with additional support for HTML imports.
@@ skipping 111 matching lines @@
     if (isHTMLScriptLoader(element))
         return toHTMLScriptElement(element)->loader();
 
     if (isSVGScriptLoader(element))
         return toSVGScriptElement(element)->loader();
 
     return 0;
 }
 
 }