The Tor Browser: docshell/base/nsDSURIContentListener.cpp@8bccb770b82d (annotated)

docshell/base/nsDSURIContentListener.cpp@8bccb770b82d (annotated)

docshell/base/nsDSURIContentListener.cpp

Wed, 31 Dec 2014 13:27:57 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 13:27:57 +0100
branch: TOR_BUG_3246
changeset 6: 8bccb770b82d
permissions: -rw-r--r--

Ignore runtime configuration files generated during quality assurance.

 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 #include "nsDocShell.h"
 #include "nsDSURIContentListener.h"
 #include "nsIChannel.h"
 #include "nsServiceManagerUtils.h"
 #include "nsDocShellCID.h"
 #include "nsIWebNavigationInfo.h"
 #include "nsIDocument.h"
 #include "nsIDOMWindow.h"
 #include "nsNetUtil.h"
 #include "nsAutoPtr.h"
 #include "nsIHttpChannel.h"
 #include "nsIScriptSecurityManager.h"
 #include "nsError.h"
 #include "nsCharSeparatedTokenizer.h"
 #include "nsIConsoleService.h"
 #include "nsIScriptError.h"
 #include "nsDocShellLoadTypes.h"
 using namespace mozilla;
 //*****************************************************************************
 //***    nsDSURIContentListener: Object Management
 //*****************************************************************************
 nsDSURIContentListener::nsDSURIContentListener(nsDocShell* aDocShell)
     : mDocShell(aDocShell),
       mParentContentListener(nullptr)
 {
 }
 nsDSURIContentListener::~nsDSURIContentListener()
 {
 }
 nsresult
 nsDSURIContentListener::Init()
 {
     nsresult rv;
     mNavInfo = do_GetService(NS_WEBNAVIGATION_INFO_CONTRACTID, &rv);
     NS_ASSERTION(NS_SUCCEEDED(rv), "Failed to get webnav info");
     return rv;
 }
 //*****************************************************************************
 // nsDSURIContentListener::nsISupports
 //*****************************************************************************
 NS_IMPL_ADDREF(nsDSURIContentListener)
 NS_IMPL_RELEASE(nsDSURIContentListener)
 NS_INTERFACE_MAP_BEGIN(nsDSURIContentListener)
     NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIURIContentListener)
     NS_INTERFACE_MAP_ENTRY(nsIURIContentListener)
     NS_INTERFACE_MAP_ENTRY(nsISupportsWeakReference)
 NS_INTERFACE_MAP_END
 //*****************************************************************************
 // nsDSURIContentListener::nsIURIContentListener
 //*****************************************************************************
 NS_IMETHODIMP
 nsDSURIContentListener::OnStartURIOpen(nsIURI* aURI, bool* aAbortOpen)
 {
     // If mDocShell is null here, that means someone's starting a load
     // in our docshell after it's already been destroyed.  Don't let
     // that happen.
     if (!mDocShell) {
         *aAbortOpen = true;
         return NS_OK;
     }
     nsCOMPtr<nsIURIContentListener> parentListener;
     GetParentContentListener(getter_AddRefs(parentListener));
     if (parentListener)
         return parentListener->OnStartURIOpen(aURI, aAbortOpen);
     return NS_OK;
 }
 NS_IMETHODIMP
 nsDSURIContentListener::DoContent(const char* aContentType,
                                   bool aIsContentPreferred,
                                   nsIRequest* request,
                                   nsIStreamListener** aContentHandler,
                                   bool* aAbortProcess)
 {
     nsresult rv;
     NS_ENSURE_ARG_POINTER(aContentHandler);
     NS_ENSURE_TRUE(mDocShell, NS_ERROR_FAILURE);
     // Check whether X-Frame-Options permits us to load this content in an
     // iframe and abort the load (unless we've disabled x-frame-options
     // checking).
     if (!CheckFrameOptions(request)) {
         *aAbortProcess = true;
         return NS_OK;
     }
     *aAbortProcess = false;
     // determine if the channel has just been retargeted to us...
     nsLoadFlags loadFlags = 0;
     nsCOMPtr<nsIChannel> aOpenedChannel = do_QueryInterface(request);
     if (aOpenedChannel)
       aOpenedChannel->GetLoadFlags(&loadFlags);
     if(loadFlags & nsIChannel::LOAD_RETARGETED_DOCUMENT_URI)
     {
         // XXX: Why does this not stop the content too?
         mDocShell->Stop(nsIWebNavigation::STOP_NETWORK);
         mDocShell->SetLoadType(aIsContentPreferred ? LOAD_LINK : LOAD_NORMAL);
     }
     rv = mDocShell->CreateContentViewer(aContentType, request, aContentHandler);
     if (rv == NS_ERROR_REMOTE_XUL) {
       request->Cancel(rv);
       *aAbortProcess = true;
       return NS_OK;
     }
     if (NS_FAILED(rv)) {
       // we don't know how to handle the content
       *aContentHandler = nullptr;
       return rv;
     }
     if (loadFlags & nsIChannel::LOAD_RETARGETED_DOCUMENT_URI) {
         nsCOMPtr<nsIDOMWindow> domWindow = do_GetInterface(static_cast<nsIDocShell*>(mDocShell));
         NS_ENSURE_TRUE(domWindow, NS_ERROR_FAILURE);
         domWindow->Focus();
     }
     return NS_OK;
 }
 NS_IMETHODIMP
 nsDSURIContentListener::IsPreferred(const char* aContentType,
                                     char ** aDesiredContentType,
                                     bool* aCanHandle)
 {
     NS_ENSURE_ARG_POINTER(aCanHandle);
     NS_ENSURE_ARG_POINTER(aDesiredContentType);
     // the docshell has no idea if it is the preferred content provider or not.
     // It needs to ask its parent if it is the preferred content handler or not...
     nsCOMPtr<nsIURIContentListener> parentListener;
     GetParentContentListener(getter_AddRefs(parentListener));
     if (parentListener) {
         return parentListener->IsPreferred(aContentType,
                                                    aDesiredContentType,
                                                    aCanHandle);
     }
     // we used to return false here if we didn't have a parent properly
     // registered at the top of the docshell hierarchy to dictate what
     // content types this docshell should be a preferred handler for.  But
     // this really makes it hard for developers using iframe or browser tags
     // because then they need to make sure they implement
     // nsIURIContentListener otherwise all link clicks would get sent to
     // another window because we said we weren't the preferred handler type.
     // I'm going to change the default now...if we can handle the content,
     // and someone didn't EXPLICITLY set a nsIURIContentListener at the top
     // of our docshell chain, then we'll now always attempt to process the
     // content ourselves...
     return CanHandleContent(aContentType,
                             true,
                             aDesiredContentType,
                             aCanHandle);
 }
 NS_IMETHODIMP
 nsDSURIContentListener::CanHandleContent(const char* aContentType,
                                          bool aIsContentPreferred,
                                          char ** aDesiredContentType,
                                          bool* aCanHandleContent)
 {
     NS_PRECONDITION(aCanHandleContent, "Null out param?");
     NS_ENSURE_ARG_POINTER(aDesiredContentType);
     *aCanHandleContent = false;
     *aDesiredContentType = nullptr;
     nsresult rv = NS_OK;
     if (aContentType) {
         uint32_t canHandle = nsIWebNavigationInfo::UNSUPPORTED;
         rv = mNavInfo->IsTypeSupported(nsDependentCString(aContentType),
                                        mDocShell,
                                        &canHandle);
         *aCanHandleContent = (canHandle != nsIWebNavigationInfo::UNSUPPORTED);
     }
     return rv;
 }
 NS_IMETHODIMP
 nsDSURIContentListener::GetLoadCookie(nsISupports ** aLoadCookie)
 {
     NS_IF_ADDREF(*aLoadCookie = nsDocShell::GetAsSupports(mDocShell));
     return NS_OK;
 }
 NS_IMETHODIMP
 nsDSURIContentListener::SetLoadCookie(nsISupports * aLoadCookie)
 {
 #ifdef DEBUG
     nsRefPtr<nsDocLoader> cookieAsDocLoader =
         nsDocLoader::GetAsDocLoader(aLoadCookie);
     NS_ASSERTION(cookieAsDocLoader && cookieAsDocLoader == mDocShell,
                  "Invalid load cookie being set!");
 #endif
     return NS_OK;
 }
 NS_IMETHODIMP
 nsDSURIContentListener::GetParentContentListener(nsIURIContentListener**
                                                  aParentListener)
 {
     if (mWeakParentContentListener)
     {
         nsCOMPtr<nsIURIContentListener> tempListener =
             do_QueryReferent(mWeakParentContentListener);
         *aParentListener = tempListener;
         NS_IF_ADDREF(*aParentListener);
     }
     else {
         *aParentListener = mParentContentListener;
         NS_IF_ADDREF(*aParentListener);
     }
     return NS_OK;
 }
 NS_IMETHODIMP
 nsDSURIContentListener::SetParentContentListener(nsIURIContentListener*
                                                  aParentListener)
 {
     if (aParentListener)
     {
         // Store the parent listener as a weak ref. Parents not supporting
         // nsISupportsWeakReference assert but may still be used.
         mParentContentListener = nullptr;
         mWeakParentContentListener = do_GetWeakReference(aParentListener);
         if (!mWeakParentContentListener)
         {
             mParentContentListener = aParentListener;
         }
     }
     else
     {
         mWeakParentContentListener = nullptr;
         mParentContentListener = nullptr;
     }
     return NS_OK;
 }
 bool nsDSURIContentListener::CheckOneFrameOptionsPolicy(nsIHttpChannel *httpChannel,
                                                         const nsAString& policy) {
     static const char allowFrom[] = "allow-from";
     const uint32_t allowFromLen = ArrayLength(allowFrom) - 1;
     bool isAllowFrom =
         StringHead(policy, allowFromLen).LowerCaseEqualsLiteral(allowFrom);
     // return early if header does not have one of the values with meaning
     if (!policy.LowerCaseEqualsLiteral("deny") &&
         !policy.LowerCaseEqualsLiteral("sameorigin") &&
         !isAllowFrom)
         return true;
     nsCOMPtr<nsIURI> uri;
     httpChannel->GetURI(getter_AddRefs(uri));
     // XXXkhuey when does this happen?  Is returning true safe here?
     if (!mDocShell) {
         return true;
     }
     // We need to check the location of this window and the location of the top
     // window, if we're not the top.  X-F-O: SAMEORIGIN requires that the
     // document must be same-origin with top window.  X-F-O: DENY requires that
     // the document must never be framed.
     nsCOMPtr<nsIDOMWindow> thisWindow = do_GetInterface(static_cast<nsIDocShell*>(mDocShell));
     // If we don't have DOMWindow there is no risk of clickjacking
     if (!thisWindow)
         return true;
     // GetScriptableTop, not GetTop, because we want this to respect
     // <iframe mozbrowser> boundaries.
     nsCOMPtr<nsIDOMWindow> topWindow;
     thisWindow->GetScriptableTop(getter_AddRefs(topWindow));
     // if the document is in the top window, it's not in a frame.
     if (thisWindow == topWindow)
         return true;
     // Find the top docshell in our parent chain that doesn't have the system
     // principal and use it for the principal comparison.  Finding the top
     // content-type docshell doesn't work because some chrome documents are
     // loaded in content docshells (see bug 593387).
     nsCOMPtr<nsIDocShellTreeItem> thisDocShellItem(do_QueryInterface(
                                                    static_cast<nsIDocShell*> (mDocShell)));
     nsCOMPtr<nsIDocShellTreeItem> parentDocShellItem,
                                   curDocShellItem = thisDocShellItem;
     nsCOMPtr<nsIDocument> topDoc;
     nsresult rv;
     nsCOMPtr<nsIScriptSecurityManager> ssm =
         do_GetService(NS_SCRIPTSECURITYMANAGER_CONTRACTID, &rv);
     if (!ssm) {
         MOZ_CRASH();
     }
     // Traverse up the parent chain and stop when we see a docshell whose
     // parent has a system principal, or a docshell corresponding to
     // <iframe mozbrowser>.
     while (NS_SUCCEEDED(curDocShellItem->GetParent(getter_AddRefs(parentDocShellItem))) &&
            parentDocShellItem) {
         nsCOMPtr<nsIDocShell> curDocShell = do_QueryInterface(curDocShellItem);
         if (curDocShell && curDocShell->GetIsBrowserOrApp()) {
           break;
         }
         bool system = false;
         topDoc = do_GetInterface(parentDocShellItem);
         if (topDoc) {
             if (NS_SUCCEEDED(ssm->IsSystemPrincipal(topDoc->NodePrincipal(),
                                                     &system)) && system) {
                 // Found a system-principled doc: last docshell was top.
                 break;
             }
         }
         else {
             return false;
         }
         curDocShellItem = parentDocShellItem;
     }
     // If this document has the top non-SystemPrincipal docshell it is not being
     // framed or it is being framed by a chrome document, which we allow.
     if (curDocShellItem == thisDocShellItem)
         return true;
     // If the value of the header is DENY, and the previous condition is
     // not met (current docshell is not the top docshell), prohibit the
     // load.
     if (policy.LowerCaseEqualsLiteral("deny")) {
         ReportXFOViolation(curDocShellItem, uri, eDENY);
         return false;
     }
     topDoc = do_GetInterface(curDocShellItem);
     nsCOMPtr<nsIURI> topUri;
     topDoc->NodePrincipal()->GetURI(getter_AddRefs(topUri));
     // If the X-Frame-Options value is SAMEORIGIN, then the top frame in the
     // parent chain must be from the same origin as this document.
     if (policy.LowerCaseEqualsLiteral("sameorigin")) {
         rv = ssm->CheckSameOriginURI(uri, topUri, true);
         if (NS_FAILED(rv)) {
             ReportXFOViolation(curDocShellItem, uri, eSAMEORIGIN);
             return false; /* wasn't same-origin */
         }
     }
     // If the X-Frame-Options value is "allow-from [uri]", then the top
     // frame in the parent chain must be from that origin
     if (isAllowFrom) {
         if (policy.Length() == allowFromLen ||
             (policy[allowFromLen] != ' ' &&
              policy[allowFromLen] != '\t')) {
             ReportXFOViolation(curDocShellItem, uri, eALLOWFROM);
             return false;
         }
         rv = NS_NewURI(getter_AddRefs(uri),
                        Substring(policy, allowFromLen));
         if (NS_FAILED(rv))
           return false;
         rv = ssm->CheckSameOriginURI(uri, topUri, true);
         if (NS_FAILED(rv)) {
             ReportXFOViolation(curDocShellItem, uri, eALLOWFROM);
             return false;
         }
     }
     return true;
 }
 // Check if X-Frame-Options permits this document to be loaded as a subdocument.
 // This will iterate through and check any number of X-Frame-Options policies
 // in the request (comma-separated in a header, multiple headers, etc).
 bool nsDSURIContentListener::CheckFrameOptions(nsIRequest *request)
 {
     nsresult rv;
     nsCOMPtr<nsIChannel> chan = do_QueryInterface(request);
     if (!chan) {
       return true;
     }
     nsCOMPtr<nsIHttpChannel> httpChannel = do_QueryInterface(chan);
     if (!httpChannel) {
       // check if it is hiding in a multipart channel
       rv = mDocShell->GetHttpChannel(chan, getter_AddRefs(httpChannel));
       if (NS_FAILED(rv))
         return false;
     }
     if (!httpChannel) {
         return true;
     }
     nsAutoCString xfoHeaderCValue;
     httpChannel->GetResponseHeader(NS_LITERAL_CSTRING("X-Frame-Options"),
                                    xfoHeaderCValue);
     NS_ConvertUTF8toUTF16 xfoHeaderValue(xfoHeaderCValue);
     // if no header value, there's nothing to do.
     if (xfoHeaderValue.IsEmpty())
         return true;
     // iterate through all the header values (usually there's only one, but can
     // be many.  If any want to deny the load, deny the load.
     nsCharSeparatedTokenizer tokenizer(xfoHeaderValue, ',');
     while (tokenizer.hasMoreTokens()) {
         const nsSubstring& tok = tokenizer.nextToken();
         if (!CheckOneFrameOptionsPolicy(httpChannel, tok)) {
             // cancel the load and display about:blank
             httpChannel->Cancel(NS_BINDING_ABORTED);
             if (mDocShell) {
                 nsCOMPtr<nsIWebNavigation> webNav(do_QueryObject(mDocShell));
                 if (webNav) {
                     webNav->LoadURI(MOZ_UTF16("about:blank"),
 , nullptr, nullptr, nullptr);
                 }
             }
             return false;
         }
     }
     return true;
 }
 void
 nsDSURIContentListener::ReportXFOViolation(nsIDocShellTreeItem* aTopDocShellItem,
                                            nsIURI* aThisURI,
                                            XFOHeader aHeader)
 {
     nsresult rv = NS_OK;
     nsCOMPtr<nsPIDOMWindow> topOuterWindow = do_GetInterface(aTopDocShellItem);
     if (!topOuterWindow)
         return;
     NS_ASSERTION(topOuterWindow->IsOuterWindow(), "Huh?");
     nsPIDOMWindow* topInnerWindow = topOuterWindow->GetCurrentInnerWindow();
     if (!topInnerWindow)
         return;
     nsCOMPtr<nsIURI> topURI;
     nsCOMPtr<nsIDocument> document;
     document = do_GetInterface(aTopDocShellItem);
     rv = document->NodePrincipal()->GetURI(getter_AddRefs(topURI));
     if (NS_FAILED(rv))
         return;
     if (!topURI)
         return;
     nsCString topURIString;
     nsCString thisURIString;
     rv = topURI->GetSpec(topURIString);
     if (NS_FAILED(rv))
         return;
     rv = aThisURI->GetSpec(thisURIString);
     if (NS_FAILED(rv))
         return;
     nsCOMPtr<nsIConsoleService> consoleService =
       do_GetService(NS_CONSOLESERVICE_CONTRACTID);
     nsCOMPtr<nsIScriptError> errorObject =
       do_CreateInstance(NS_SCRIPTERROR_CONTRACTID);
     if (!consoleService || !errorObject)
         return;
     nsString msg = NS_LITERAL_STRING("Load denied by X-Frame-Options: ");
     msg.Append(NS_ConvertUTF8toUTF16(thisURIString));
     switch (aHeader) {
         case eDENY:
             msg.AppendLiteral(" does not permit framing.");
             break;
         case eSAMEORIGIN:
             msg.AppendLiteral(" does not permit cross-origin framing.");
             break;
         case eALLOWFROM:
             msg.AppendLiteral(" does not permit framing by ");
             msg.Append(NS_ConvertUTF8toUTF16(topURIString));
             msg.AppendLiteral(".");
             break;
     }
     rv = errorObject->InitWithWindowID(msg, EmptyString(), EmptyString(), 0, 0,
                                        nsIScriptError::errorFlag,
                                        "X-Frame-Options",
                                        topInnerWindow->WindowID());
     if (NS_FAILED(rv))
         return;
     consoleService->LogMessage(errorObject);
 }

The Tor Browser / annotate

docshell/base/nsDSURIContentListener.cpp@8bccb770b82d (annotated)

docshell/base/nsDSURIContentListener.cpp