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
33namespace WebCore {
34
35class HTMLDocumentParser;
36
37class XSSFilter {
38    WTF_MAKE_NONCOPYABLE(XSSFilter);
39public:
40    explicit XSSFilter(HTMLDocumentParser*);
41
42    void filterToken(HTMLToken&);
43
44private:
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