1 /* 2 * Copyright (C) 2011 Adam Barth. All Rights Reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY 14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR 17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26 #ifndef XSSAuditor_h 27 #define XSSAuditor_h 28 29 #include "core/html/parser/HTMLToken.h" 30 #include "platform/network/HTTPParsers.h" 31 #include "platform/text/SuffixTree.h" 32 #include "platform/weborigin/KURL.h" 33 #include "wtf/PassOwnPtr.h" 34 #include "wtf/text/TextEncoding.h" 35 36 namespace blink { 37 38 class Document; 39 class HTMLDocumentParser; 40 class HTMLSourceTracker; 41 class XSSInfo; 42 class XSSAuditorDelegate; 43 44 struct FilterTokenRequest { 45 FilterTokenRequest(HTMLToken& token, HTMLSourceTracker& sourceTracker, bool shouldAllowCDATA) 46 : token(token) 47 , sourceTracker(sourceTracker) 48 , shouldAllowCDATA(shouldAllowCDATA) 49 { } 50 51 HTMLToken& token; 52 HTMLSourceTracker& sourceTracker; 53 bool shouldAllowCDATA; 54 }; 55 56 class XSSAuditor { 57 WTF_MAKE_NONCOPYABLE(XSSAuditor); 58 public: 59 XSSAuditor(); 60 61 void init(Document*, XSSAuditorDelegate*); 62 void initForFragment(); 63 64 PassOwnPtr<XSSInfo> filterToken(const FilterTokenRequest&); 65 bool isSafeToSendToAnotherThread() const; 66 67 void setEncoding(const WTF::TextEncoding&); 68 69 private: 70 static const size_t kMaximumFragmentLengthTarget = 100; 71 72 enum State { 73 Uninitialized, 74 FilteringTokens, 75 PermittingAdjacentCharacterTokens, 76 SuppressingAdjacentCharacterTokens 77 }; 78 79 enum TruncationKind { 80 NoTruncation, 81 NormalAttributeTruncation, 82 SrcLikeAttributeTruncation, 83 ScriptLikeAttributeTruncation 84 }; 85 86 bool filterStartToken(const FilterTokenRequest&); 87 void filterEndToken(const FilterTokenRequest&); 88 bool filterCharacterToken(const FilterTokenRequest&); 89 bool filterScriptToken(const FilterTokenRequest&); 90 bool filterObjectToken(const FilterTokenRequest&); 91 bool filterParamToken(const FilterTokenRequest&); 92 bool filterEmbedToken(const FilterTokenRequest&); 93 bool filterAppletToken(const FilterTokenRequest&); 94 bool filterFrameToken(const FilterTokenRequest&); 95 bool filterMetaToken(const FilterTokenRequest&); 96 bool filterBaseToken(const FilterTokenRequest&); 97 bool filterFormToken(const FilterTokenRequest&); 98 bool filterInputToken(const FilterTokenRequest&); 99 bool filterButtonToken(const FilterTokenRequest&); 100 101 bool eraseDangerousAttributesIfInjected(const FilterTokenRequest&); 102 bool eraseAttributeIfInjected(const FilterTokenRequest&, const QualifiedName&, const String& replacementValue = String(), TruncationKind treatment = NormalAttributeTruncation); 103 104 String canonicalizedSnippetForTagName(const FilterTokenRequest&); 105 String canonicalizedSnippetForJavaScript(const FilterTokenRequest&); 106 String nameFromAttribute(const FilterTokenRequest&, const HTMLToken::Attribute&); 107 String snippetFromAttribute(const FilterTokenRequest&, const HTMLToken::Attribute&); 108 String canonicalize(String, TruncationKind); 109 110 bool isContainedInRequest(const String&); 111 bool isLikelySafeResource(const String& url); 112 113 KURL m_documentURL; 114 bool m_isEnabled; 115 116 ReflectedXSSDisposition m_xssProtection; 117 bool m_didSendValidCSPHeader; 118 bool m_didSendValidXSSProtectionHeader; 119 120 String m_decodedURL; 121 String m_decodedHTTPBody; 122 String m_httpBodyAsString; 123 OwnPtr<SuffixTree<ASCIICodebook> > m_decodedHTTPBodySuffixTree; 124 125 State m_state; 126 bool m_scriptTagFoundInRequest; 127 unsigned m_scriptTagNestingLevel; 128 WTF::TextEncoding m_encoding; 129 }; 130 131 } 132 133 #endif 134