CSP: Add an experimental 'unsafe-dynamic' source expression.

third_party/WebKit/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 285 matching lines @@
 
     ASSERT(!m_resource);
     if (!stripLeadingAndTrailingHTMLSpaces(sourceUrl).isEmpty()) {
         FetchRequest request(ResourceRequest(elementDocument->completeURL(sourceUrl)), m_element->localName());
 
         CrossOriginAttributeValue crossOrigin = crossOriginAttributeValue(m_element->fastGetAttribute(HTMLNames::crossoriginAttr));
         if (crossOrigin != CrossOriginAttributeNotSet)
             request.setCrossOriginAccessControl(elementDocument->securityOrigin(), crossOrigin);
         request.setCharset(scriptCharset());
 
-        bool scriptPassesCSP = elementDocument->contentSecurityPolicy()->allowScriptWithNonce(m_element->fastGetAttribute(HTMLNames::nonceAttr));
+        // Skip fetch-related CSP checks if the script element has a valid nonce, or if dynamically
+        // injected script is whitelisted and this script is not parser-inserted.
+        bool scriptPassesCSP = elementDocument->contentSecurityPolicy()->allowScriptWithNonce(m_element->fastGetAttribute(HTMLNames::nonceAttr)) || (!isParserInserted() && elementDocument->contentSecurityPolicy()->allowDynamic());
+
         if (scriptPassesCSP)
             request.setContentSecurityCheck(DoNotCheckContentSecurityPolicy);
         request.setDefer(defer);
 
         String integrityAttr = m_element->fastGetAttribute(HTMLNames::integrityAttr);
         if (!integrityAttr.isEmpty()) {
             IntegrityMetadataSet metadataSet;
             SubresourceIntegrity::parseIntegrityAttribute(integrityAttr, metadataSet, elementDocument.get());
             request.setIntegrityMetadata(metadataSet);
         }
@@ skipping 45 matching lines @@
     RefPtrWillBeRawPtr<Document> elementDocument(m_element->document());
     RefPtrWillBeRawPtr<Document> contextDocument = elementDocument->contextDocument().get();
     if (!contextDocument)
         return true;
 
     LocalFrame* frame = contextDocument->frame();
 
     const ContentSecurityPolicy* csp = elementDocument->contentSecurityPolicy();
     bool shouldBypassMainWorldCSP = (frame && frame->script().shouldBypassMainWorldCSP())
         || csp->allowScriptWithNonce(m_element->fastGetAttribute(HTMLNames::nonceAttr))
-        || csp->allowScriptWithHash(sourceCode.source().toString());
+        || csp->allowScriptWithHash(sourceCode.source().toString())
+        || (!isParserInserted() && csp->allowDynamic());
 
     if (!m_isExternalScript && (!shouldBypassMainWorldCSP && !csp->allowInlineScript(elementDocument->url(), m_startLineNumber, sourceCode.source().toString()))) {
         return false;
     }
 
     if (m_isExternalScript) {
         ScriptResource* resource = m_resource ? m_resource.get() : sourceCode.resource();
         if (resource) {
             if (!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."));
@@ skipping 138 matching lines @@
     if (isHTMLScriptLoader(element))
         return toHTMLScriptElement(element)->loader();
 
     if (isSVGScriptLoader(element))
         return toSVGScriptElement(element)->loader();
 
     return 0;
 }
 
 } // namespace blink