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      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 XSSFilter_h
     27 #define XSSFilter_h
     28 
     29 #include "HTMLToken.h"
     30 #include "HTTPParsers.h"
     31 #include "SuffixTree.h"
     32 
     33 namespace WebCore {
     34 
     35 class HTMLDocumentParser;
     36 
     37 class XSSFilter {
     38     WTF_MAKE_NONCOPYABLE(XSSFilter);
     39 public:
     40     explicit XSSFilter(HTMLDocumentParser*);
     41 
     42     void filterToken(HTMLToken&);
     43 
     44 private:
     45     enum State {
     46         Uninitialized,
     47         Initial,
     48         AfterScriptStartTag,
     49     };
     50 
     51     void init();
     52 
     53     bool filterTokenInitial(HTMLToken&);
     54     bool filterTokenAfterScriptStartTag(HTMLToken&);
     55 
     56     bool filterScriptToken(HTMLToken&);
     57     bool filterObjectToken(HTMLToken&);
     58     bool filterParamToken(HTMLToken&);
     59     bool filterEmbedToken(HTMLToken&);
     60     bool filterAppletToken(HTMLToken&);
     61     bool filterIframeToken(HTMLToken&);
     62     bool filterMetaToken(HTMLToken&);
     63     bool filterBaseToken(HTMLToken&);
     64     bool filterFormToken(HTMLToken&);
     65 
     66     bool eraseDangerousAttributesIfInjected(HTMLToken&);
     67     bool eraseAttributeIfInjected(HTMLToken&, const QualifiedName&, const String& replacementValue = String());
     68 
     69     String snippetForRange(const HTMLToken&, int start, int end);
     70     String snippetForAttribute(const HTMLToken&, const HTMLToken::Attribute&);
     71 
     72     bool isContainedInRequest(const String&);
     73     bool isSameOriginResource(const String& url);
     74 
     75     HTMLDocumentParser* m_parser;
     76     bool m_isEnabled;
     77     XSSProtectionDisposition m_xssProtection;
     78 
     79     String m_decodedURL;
     80     String m_decodedHTTPBody;
     81     OwnPtr<SuffixTree<ASCIICodebook> > m_decodedHTTPBodySuffixTree;
     82 
     83     State m_state;
     84     String m_cachedSnippet;
     85 };
     86 
     87 }
     88 
     89 #endif
     90