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/*
* Copyright (C) 2011 Adam Barth. 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
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include "HTMLToken.h"
#include "HTTPParsers.h"
#include "URL.h"
#include "SuffixTree.h"
#include "TextEncoding.h"
namespace WebCore {
class Document;
class HTMLDocumentParser;
class HTMLSourceTracker;
class XSSInfo;
class XSSAuditorDelegate;
struct FilterTokenRequest {
FilterTokenRequest(HTMLToken& token, HTMLSourceTracker& sourceTracker, bool shouldAllowCDATA)
: token(token)
, sourceTracker(sourceTracker)
, shouldAllowCDATA(shouldAllowCDATA)
{ }
HTMLToken& token;
HTMLSourceTracker& sourceTracker;
bool shouldAllowCDATA;
};
class XSSAuditor {
WTF_MAKE_NONCOPYABLE(XSSAuditor);
public:
XSSAuditor();
void init(Document*, XSSAuditorDelegate*);
void initForFragment();
std::unique_ptr<XSSInfo> filterToken(const FilterTokenRequest&);
private:
static const size_t kMaximumFragmentLengthTarget = 100;
enum State {
Uninitialized,
Initialized
};
enum class TruncationStyle {
None,
NormalAttribute,
SrcLikeAttribute,
ScriptLikeAttribute
};
bool filterStartToken(const FilterTokenRequest&);
void filterEndToken(const FilterTokenRequest&);
bool filterCharacterToken(const FilterTokenRequest&);
bool filterScriptToken(const FilterTokenRequest&);
bool filterObjectToken(const FilterTokenRequest&);
bool filterParamToken(const FilterTokenRequest&);
bool filterEmbedToken(const FilterTokenRequest&);
bool filterAppletToken(const FilterTokenRequest&);
bool filterFrameToken(const FilterTokenRequest&);
bool filterMetaToken(const FilterTokenRequest&);
bool filterBaseToken(const FilterTokenRequest&);
bool filterFormToken(const FilterTokenRequest&);
bool filterInputToken(const FilterTokenRequest&);
bool filterButtonToken(const FilterTokenRequest&);
bool eraseDangerousAttributesIfInjected(const FilterTokenRequest&);
bool eraseAttributeIfInjected(const FilterTokenRequest&, const QualifiedName&, const String& replacementValue = String(), TruncationStyle = TruncationStyle::NormalAttribute);
String canonicalizedSnippetForTagName(const FilterTokenRequest&);
String canonicalizedSnippetForJavaScript(const FilterTokenRequest&);
String snippetFromAttribute(const FilterTokenRequest&, const HTMLToken::Attribute&);
String canonicalize(const String&, TruncationStyle);
bool isContainedInRequest(const String&);
bool isLikelySafeResource(const String& url);
URL m_documentURL;
bool m_isEnabled;
XSSProtectionDisposition m_xssProtection;
bool m_didSendValidXSSProtectionHeader;
String m_decodedURL;
String m_decodedHTTPBody;
std::unique_ptr<SuffixTree<ASCIICodebook>> m_decodedHTTPBodySuffixTree;
State m_state;
bool m_wasScriptTagFoundInRequest { false };
unsigned m_scriptTagNestingLevel;
TextEncoding m_encoding;
};
} // namespace WebCore
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