1 /*
2 * Copyright (C) 2009 Google Inc. 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 are
6 * met:
7 *
8 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * * Redistributions in binary form must reproduce the above
11 * copyright notice, this list of conditions and the following disclaimer
12 * in the documentation and/or other materials provided with the
13 * distribution.
14 * * Neither the name of Google Inc. nor the names of its
15 * contributors may be used to endorse or promote products derived from
16 * this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31 #ifndef BindingSecurity_h
32 #define BindingSecurity_h
33
34 #include "BindingSecurityBase.h"
35 #include "CSSHelper.h"
36 #include "Element.h"
37 #include "GenericBinding.h"
38 #include "HTMLFrameElementBase.h"
39
40 namespace WebCore {
41
42 class DOMWindow;
43 class Frame;
44 class Node;
45
46 // Security functions shared by various language bindings.
47 template <class Binding>
48 class BindingSecurity : public BindingSecurityBase {
49 public:
50 // Check if the active execution context can access the target frame.
51 static bool canAccessFrame(State<Binding>*, Frame*, bool reportError);
52
53 // Check if it is safe to access the given node from the
54 // current security context.
55 static bool checkNodeSecurity(State<Binding>*, Node* target);
56
57 static bool allowSettingFrameSrcToJavascriptUrl(State<Binding>*, HTMLFrameElementBase*, String value);
58 static bool allowSettingSrcToJavascriptURL(State<Binding>*, Element*, String name, String value);
59
60 private:
BindingSecurity()61 explicit BindingSecurity() {}
62 ~BindingSecurity();
63
64 // Check if the current DOMWindow's security context can access the target
65 // DOMWindow. This function does not report errors, so most callers should
66 // use canAccessFrame instead.
67 static bool canAccessWindow(State<Binding>*, DOMWindow* target);
68 };
69
70 // Implementations of templated methods must be in this file.
71
72 template <class Binding>
canAccessWindow(State<Binding> * state,DOMWindow * targetWindow)73 bool BindingSecurity<Binding>::canAccessWindow(State<Binding>* state,
74 DOMWindow* targetWindow)
75 {
76 DOMWindow* activeWindow = state->getActiveWindow();
77 return canAccess(activeWindow, targetWindow);
78 }
79
80 template <class Binding>
canAccessFrame(State<Binding> * state,Frame * target,bool reportError)81 bool BindingSecurity<Binding>::canAccessFrame(State<Binding>* state,
82 Frame* target,
83 bool reportError)
84 {
85 // The subject is detached from a frame, deny accesses.
86 if (!target)
87 return false;
88
89 if (!canAccessWindow(state, getDOMWindow(target))) {
90 if (reportError)
91 state->immediatelyReportUnsafeAccessTo(target);
92 return false;
93 }
94 return true;
95 }
96
97 template <class Binding>
checkNodeSecurity(State<Binding> * state,Node * node)98 bool BindingSecurity<Binding>::checkNodeSecurity(State<Binding>* state, Node* node)
99 {
100 if (!node)
101 return false;
102
103 Frame* target = getFrame(node);
104
105 if (!target)
106 return false;
107
108 return canAccessFrame(state, target, true);
109 }
110
111 template <class Binding>
allowSettingFrameSrcToJavascriptUrl(State<Binding> * state,HTMLFrameElementBase * frame,String value)112 bool BindingSecurity<Binding>::allowSettingFrameSrcToJavascriptUrl(State<Binding>* state, HTMLFrameElementBase* frame, String value)
113 {
114 if (protocolIsJavaScript(deprecatedParseURL(value))) {
115 Node* contentDoc = frame->contentDocument();
116 if (contentDoc && !checkNodeSecurity(state, contentDoc))
117 return false;
118 }
119 return true;
120 }
121
122 template <class Binding>
allowSettingSrcToJavascriptURL(State<Binding> * state,Element * element,String name,String value)123 bool BindingSecurity<Binding>::allowSettingSrcToJavascriptURL(State<Binding>* state, Element* element, String name, String value)
124 {
125 if ((element->hasTagName(HTMLNames::iframeTag) || element->hasTagName(HTMLNames::frameTag)) && equalIgnoringCase(name, "src"))
126 return allowSettingFrameSrcToJavascriptUrl(state, static_cast<HTMLFrameElementBase*>(element), value);
127 return true;
128 }
129
130 }
131
132 #endif // BindingSecurity_h
133