1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
|
/*
* Copyright (C) 2008, 2009 Daniel Bates (dbates@intudata.com)
* 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 COMPUTER, 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.
*/
#ifndef XSSAuditor_h
#define XSSAuditor_h
#include "PlatformString.h"
#include "TextEncoding.h"
namespace WebCore {
class Frame;
class ScriptSourceCode;
// The XSSAuditor class is used to prevent type 1 cross-site scripting
// vulnerabilites (also known as reflected vulnerabilities).
//
// More specifically, the XSSAuditor class decides whether the execution of
// a script is to be allowed or denied based on the content of any
// user-submitted data, including:
//
// * the query string of the URL.
// * the HTTP-POST data.
//
// If the source code of a script resembles any user-submitted data then it
// is denied execution.
//
// When you instantiate the XSSAuditor you must specify the {@link Frame}
// of the page that you wish to audit.
//
// Bindings
//
// An XSSAuditor is instantiated within the contructor of a
// ScriptController object and passed the Frame the script originated. The
// ScriptController calls back to the XSSAuditor to determine whether a
// JavaScript script is safe to execute before executing it. The following
// methods call into XSSAuditor:
//
// * ScriptController::evaluate - used to evaluate JavaScript scripts.
// * ScriptController::createInlineEventListener - used to create JavaScript event handlers.
// * HTMLTokenizer::scriptHandler - used to load external JavaScript scripts.
//
class XSSAuditor {
public:
XSSAuditor(Frame*);
~XSSAuditor();
bool isEnabled() const;
// Determines whether the script should be allowed or denied execution
// based on the content of any user-submitted data.
bool canEvaluate(const String& code) const;
// Determines whether the JavaScript URL should be allowed or denied execution
// based on the content of any user-submitted data.
bool canEvaluateJavaScriptURL(const String& code) const;
// Determines whether the event listener should be created based on the
// content of any user-submitted data.
bool canCreateInlineEventListener(const String& functionName, const String& code) const;
// Determines whether the external script should be loaded based on the
// content of any user-submitted data.
bool canLoadExternalScriptFromSrc(const String& context, const String& url) const;
// Determines whether object should be loaded based on the content of
// any user-submitted data.
//
// This method is called by FrameLoader::requestObject.
bool canLoadObject(const String& url) const;
// Determines whether the base URL should be changed based on the content
// of any user-submitted data.
//
// This method is called by HTMLBaseElement::process.
bool canSetBaseElementURL(const String& url) const;
private:
class CachingURLCanonicalizer
{
public:
CachingURLCanonicalizer() : m_decodeEntities(false) { }
String canonicalizeURL(const String& url, const TextEncoding& encoding, bool decodeEntities);
private:
// The parameters we were called with last.
String m_inputURL;
TextEncoding m_encoding;
bool m_decodeEntities;
// The cached result.
String m_cachedCanonicalizedURL;
};
static String canonicalize(const String&);
static String decodeURL(const String& url, const TextEncoding& encoding, bool decodeEntities);
static String decodeHTMLEntities(const String&, bool leaveUndecodableEntitiesUntouched = true);
bool findInRequest(const String&, bool decodeEntities = true, bool allowRequestIfNoIllegalURICharacters = false) const;
bool findInRequest(Frame*, const String&, bool decodeEntities = true, bool allowRequestIfNoIllegalURICharacters = false) const;
// The frame to audit.
Frame* m_frame;
// A state store to help us avoid canonicalizing the same URL repeated.
mutable CachingURLCanonicalizer m_cache;
};
} // namespace WebCore
#endif // XSSAuditor_h
|
