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      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 #include "config.h"
     32 #include "bindings/core/v8/BindingSecurity.h"
     33 
     34 #include "bindings/core/v8/V8Binding.h"
     35 #include "core/dom/Document.h"
     36 #include "core/frame/LocalDOMWindow.h"
     37 #include "core/frame/LocalFrame.h"
     38 #include "core/frame/Settings.h"
     39 #include "core/html/HTMLFrameElementBase.h"
     40 #include "platform/weborigin/SecurityOrigin.h"
     41 
     42 namespace blink {
     43 
     44 static bool isDocumentAccessibleFromDOMWindow(Document* targetDocument, LocalDOMWindow* callingWindow)
     45 {
     46     if (!targetDocument)
     47         return false;
     48 
     49     if (!callingWindow)
     50         return false;
     51 
     52     if (callingWindow->document()->securityOrigin()->canAccess(targetDocument->securityOrigin()))
     53         return true;
     54 
     55     return false;
     56 }
     57 
     58 static bool canAccessDocument(v8::Isolate* isolate, Document* targetDocument, ExceptionState& exceptionState)
     59 {
     60     LocalDOMWindow* callingWindow = callingDOMWindow(isolate);
     61     if (isDocumentAccessibleFromDOMWindow(targetDocument, callingWindow))
     62         return true;
     63 
     64     if (targetDocument->domWindow())
     65         exceptionState.throwSecurityError(targetDocument->domWindow()->sanitizedCrossDomainAccessErrorMessage(callingWindow), targetDocument->domWindow()->crossDomainAccessErrorMessage(callingWindow));
     66     return false;
     67 }
     68 
     69 static bool canAccessDocument(v8::Isolate* isolate, Document* targetDocument, SecurityReportingOption reportingOption = ReportSecurityError)
     70 {
     71     LocalDOMWindow* callingWindow = callingDOMWindow(isolate);
     72     if (isDocumentAccessibleFromDOMWindow(targetDocument, callingWindow))
     73         return true;
     74 
     75     if (reportingOption == ReportSecurityError && targetDocument->domWindow()) {
     76         if (LocalFrame* frame = targetDocument->frame())
     77             frame->domWindow()->printErrorMessage(targetDocument->domWindow()->crossDomainAccessErrorMessage(callingWindow));
     78     }
     79 
     80     return false;
     81 }
     82 
     83 bool BindingSecurity::shouldAllowAccessToFrame(v8::Isolate* isolate, Frame* target, SecurityReportingOption reportingOption)
     84 {
     85     if (!target || !target->isLocalFrame())
     86         return false;
     87     return canAccessDocument(isolate, toLocalFrame(target)->document(), reportingOption);
     88 }
     89 
     90 bool BindingSecurity::shouldAllowAccessToFrame(v8::Isolate* isolate, Frame* target, ExceptionState& exceptionState)
     91 {
     92     if (!target || !target->isLocalFrame())
     93         return false;
     94     return canAccessDocument(isolate, toLocalFrame(target)->document(), exceptionState);
     95 }
     96 
     97 bool BindingSecurity::shouldAllowAccessToNode(v8::Isolate* isolate, Node* target, ExceptionState& exceptionState)
     98 {
     99     return target && canAccessDocument(isolate, &target->document(), exceptionState);
    100 }
    101 
    102 }
    103