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/*
* Copyright (C) 2009 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "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 THE COPYRIGHT
* OWNER 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 BindingSecurity_h
#define BindingSecurity_h
#include "BindingSecurityBase.h"
#include "Element.h"
#include "Frame.h"
#include "GenericBinding.h"
#include "HTMLFrameElementBase.h"
#include "HTMLNames.h"
#include "HTMLParserIdioms.h"
#include "Settings.h"
namespace WebCore {
class DOMWindow;
class Node;
// Security functions shared by various language bindings.
template <class Binding>
class BindingSecurity : public BindingSecurityBase {
public:
// Check if the active execution context can access the target frame.
static bool canAccessFrame(State<Binding>*, Frame*, bool reportError);
// Check if it is safe to access the given node from the
// current security context.
static bool checkNodeSecurity(State<Binding>*, Node* target);
static bool allowPopUp(State<Binding>*);
static bool allowSettingFrameSrcToJavascriptUrl(State<Binding>*, HTMLFrameElementBase*, String value);
static bool allowSettingSrcToJavascriptURL(State<Binding>*, Element*, String name, String value);
static bool shouldAllowNavigation(State<Binding>*, Frame*);
private:
explicit BindingSecurity() {}
~BindingSecurity();
// Check if the current DOMWindow's security context can access the target
// DOMWindow. This function does not report errors, so most callers should
// use canAccessFrame instead.
static bool canAccessWindow(State<Binding>*, DOMWindow* target);
};
// Implementations of templated methods must be in this file.
template <class Binding>
bool BindingSecurity<Binding>::canAccessWindow(State<Binding>* state,
DOMWindow* targetWindow)
{
DOMWindow* activeWindow = state->activeWindow();
return canAccess(activeWindow, targetWindow);
}
template <class Binding>
bool BindingSecurity<Binding>::canAccessFrame(State<Binding>* state,
Frame* target,
bool reportError)
{
// The subject is detached from a frame, deny accesses.
if (!target)
return false;
if (!canAccessWindow(state, getDOMWindow(target))) {
if (reportError)
state->immediatelyReportUnsafeAccessTo(target);
return false;
}
return true;
}
template <class Binding>
bool BindingSecurity<Binding>::checkNodeSecurity(State<Binding>* state, Node* node)
{
if (!node)
return false;
Frame* target = getFrame(node);
if (!target)
return false;
return canAccessFrame(state, target, true);
}
template <class Binding>
bool BindingSecurity<Binding>::allowPopUp(State<Binding>* state)
{
if (state->processingUserGesture())
return true;
Frame* frame = state->firstFrame();
ASSERT(frame);
Settings* settings = frame->settings();
return settings && settings->javaScriptCanOpenWindowsAutomatically();
}
template <class Binding>
bool BindingSecurity<Binding>::allowSettingFrameSrcToJavascriptUrl(State<Binding>* state, HTMLFrameElementBase* frame, String value)
{
if (protocolIsJavaScript(stripLeadingAndTrailingHTMLSpaces(value))) {
Node* contentDoc = frame->contentDocument();
if (contentDoc && !checkNodeSecurity(state, contentDoc))
return false;
}
return true;
}
template <class Binding>
bool BindingSecurity<Binding>::allowSettingSrcToJavascriptURL(State<Binding>* state, Element* element, String name, String value)
{
if ((element->hasTagName(HTMLNames::iframeTag) || element->hasTagName(HTMLNames::frameTag)) && equalIgnoringCase(name, "src"))
return allowSettingFrameSrcToJavascriptUrl(state, static_cast<HTMLFrameElementBase*>(element), value);
return true;
}
template <class Binding>
bool BindingSecurity<Binding>::shouldAllowNavigation(State<Binding>* state, Frame* frame)
{
Frame* activeFrame = state->activeFrame();
return activeFrame && activeFrame->loader()->shouldAllowNavigation(frame);
}
}
#endif // BindingSecurity_h
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