Implementation of script hashes for CSP.

Source/core/frame/ContentSecurityPolicy.h

 /*
  * Copyright (C) 2011 Google, Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 55 matching lines @@
     enum HeaderType {
         Report,
         Enforce,
     };
 
     enum ReportingStatus {
         SendReport,
         SuppressReport
     };
 
+    enum HashAlgorithms {
+        HashAlgorithmsNone   = 0,
+        HashAlgorithmsSha1   = 1 << 1,
+        HashAlgorithmsSha256 = 1 << 2
+    };
+
     void didReceiveHeaders(const ContentSecurityPolicyResponseHeaders&);
     void didReceiveHeader(const String&, HeaderType);
 
     // These functions are wrong because they assume that there is only one header.
     // FIXME: Replace them with functions that return vectors.
     const String& deprecatedHeader() const;
     HeaderType deprecatedHeaderType() const;
 
     bool allowJavaScriptURLs(const String& contextURL, const WTF::OrdinalNumber& contextLine, ReportingStatus = SendReport) const;
     bool allowInlineEventHandlers(const String& contextURL, const WTF::OrdinalNumber& contextLine, ReportingStatus = SendReport) const;
     bool allowInlineScript(const String& contextURL, const WTF::OrdinalNumber& contextLine, ReportingStatus = SendReport) const;
     bool allowInlineStyle(const String& contextURL, const WTF::OrdinalNumber& contextLine, ReportingStatus = SendReport) const;
     bool allowEval(ScriptState* = 0, ReportingStatus = SendReport) const;
     bool allowPluginType(const String& type, const String& typeAttribute, const KURL&, ReportingStatus = SendReport) const;
 
     bool allowScriptFromSource(const KURL&, ReportingStatus = SendReport) const;
     bool allowObjectFromSource(const KURL&, ReportingStatus = SendReport) const;
     bool allowChildFrameFromSource(const KURL&, ReportingStatus = SendReport) const;
     bool allowImageFromSource(const KURL&, ReportingStatus = SendReport) const;
     bool allowStyleFromSource(const KURL&, ReportingStatus = SendReport) const;
     bool allowFontFromSource(const KURL&, ReportingStatus = SendReport) const;
     bool allowMediaFromSource(const KURL&, ReportingStatus = SendReport) const;
     bool allowConnectToSource(const KURL&, ReportingStatus = SendReport) const;
     bool allowFormAction(const KURL&, ReportingStatus = SendReport) const;
     bool allowBaseURI(const KURL&, ReportingStatus = SendReport) const;
+    // The nonce and hash allow functions are guaranteed to not have any side
+    // effects, including reporting.
     bool allowScriptNonce(const String& nonce) const;
     bool allowStyleNonce(const String& nonce) const;
+    bool allowScriptHash(const String& source) const;
+
+    void usesScriptHashAlgorithms(uint8_t HashAlgorithms);
 
     ReflectedXSSDisposition reflectedXSSDisposition() const;
 
     void setOverrideAllowInlineStyle(bool);
 
     bool isActive() const;
     void gatherReportURIs(DOMStringList&) const;
 
     void reportDirectiveAsSourceExpression(const String& directiveName, const String& sourceExpression) const;
     void reportDuplicateDirective(const String&) const;
     void reportInvalidDirectiveValueCharacter(const String& directiveName, const String& value) const;
     void reportInvalidPathCharacter(const String& directiveName, const String& value, const char) const;
-    void reportInvalidNonce(const String&) const;
     void reportInvalidPluginTypes(const String&) const;
     void reportInvalidSandboxFlags(const String&) const;
     void reportInvalidSourceExpression(const String& directiveName, const String& source) const;
     void reportInvalidReflectedXSS(const String&) const;
     void reportMissingReportURI(const String&) const;
     void reportUnsupportedDirective(const String&) const;
     void reportViolation(const String& directiveText, const String& effectiveDirective, const String& consoleMessage, const KURL& blockedURL, const Vector<KURL>& reportURIs, const String& header);
 
     void reportBlockedScriptExecutionToInspector(const String& directiveText) const;
 
@@ skipping 16 matching lines @@
     void addPolicyFromHeaderValue(const String&, HeaderType);
 
     bool shouldSendViolationReport(const String&) const;
     void didSendViolationReport(const String&);
 
     ExecutionContextClient* m_client;
     bool m_overrideInlineStyleAllowed;
     CSPDirectiveListVector m_policies;
 
     HashSet<unsigned, AlreadyHashed> m_violationReportsSent;
+
+    // We put the hash functions used on the policy object so that we only need
+    // to calculate a script hash once and then distribute it to all of the
+    // directives for validation.
+    uint8_t m_sourceHashAlgorithmsUsed;
 };
 
 }
 
 #endif