147 lines
5.3 KiB
C++
147 lines
5.3 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "PostMessageEvent.h"
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#include "MessageEvent.h"
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#include "mozilla/dom/BlobBinding.h"
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#include "mozilla/dom/File.h"
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#include "mozilla/dom/FileList.h"
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#include "mozilla/dom/FileListBinding.h"
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#include "mozilla/dom/MessagePort.h"
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#include "mozilla/dom/MessagePortBinding.h"
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#include "mozilla/dom/PMessagePort.h"
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#include "mozilla/dom/StructuredCloneTags.h"
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#include "mozilla/EventDispatcher.h"
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#include "nsGlobalWindow.h"
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#include "nsIPresShell.h"
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#include "nsIPrincipal.h"
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#include "nsPresContext.h"
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namespace mozilla {
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namespace dom {
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PostMessageEvent::PostMessageEvent(nsGlobalWindow* aSource,
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const nsAString& aCallerOrigin,
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nsGlobalWindow* aTargetWindow,
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nsIPrincipal* aProvidedPrincipal,
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bool aTrustedCaller)
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: StructuredCloneHolder(CloningSupported, TransferringSupported,
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SameProcessSameThread),
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mSource(aSource),
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mCallerOrigin(aCallerOrigin),
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mTargetWindow(aTargetWindow),
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mProvidedPrincipal(aProvidedPrincipal),
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mTrustedCaller(aTrustedCaller)
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{
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MOZ_COUNT_CTOR(PostMessageEvent);
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}
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PostMessageEvent::~PostMessageEvent()
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{
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MOZ_COUNT_DTOR(PostMessageEvent);
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}
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NS_IMETHODIMP
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PostMessageEvent::Run()
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{
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MOZ_ASSERT(mTargetWindow->IsOuterWindow(),
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"should have been passed an outer window!");
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MOZ_ASSERT(!mSource || mSource->IsOuterWindow(),
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"should have been passed an outer window!");
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AutoJSAPI jsapi;
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jsapi.Init();
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JSContext* cx = jsapi.cx();
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// If we bailed before this point we're going to leak mMessage, but
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// that's probably better than crashing.
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RefPtr<nsGlobalWindow> targetWindow;
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if (mTargetWindow->IsClosedOrClosing() ||
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!(targetWindow = mTargetWindow->GetCurrentInnerWindowInternal()) ||
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targetWindow->IsClosedOrClosing())
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return NS_OK;
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MOZ_ASSERT(targetWindow->IsInnerWindow(),
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"we ordered an inner window!");
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JSAutoCompartment ac(cx, targetWindow->GetWrapperPreserveColor());
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// Ensure that any origin which might have been provided is the origin of this
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// window's document. Note that we do this *now* instead of when postMessage
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// is called because the target window might have been navigated to a
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// different location between then and now. If this check happened when
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// postMessage was called, it would be fairly easy for a malicious webpage to
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// intercept messages intended for another site by carefully timing navigation
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// of the target window so it changed location after postMessage but before
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// now.
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if (mProvidedPrincipal) {
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// Get the target's origin either from its principal or, in the case the
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// principal doesn't carry a URI (e.g. the system principal), the target's
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// document.
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nsIPrincipal* targetPrin = targetWindow->GetPrincipal();
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if (NS_WARN_IF(!targetPrin))
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return NS_OK;
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// Note: This is contrary to the spec with respect to file: URLs, which
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// the spec groups into a single origin, but given we intentionally
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// don't do that in other places it seems better to hold the line for
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// now. Long-term, we want HTML5 to address this so that we can
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// be compliant while being safer.
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if (!targetPrin->Equals(mProvidedPrincipal)) {
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return NS_OK;
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}
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}
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ErrorResult rv;
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JS::Rooted<JS::Value> messageData(cx);
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nsCOMPtr<nsPIDOMWindow> window = targetWindow.get();
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Read(window, cx, &messageData, rv);
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if (NS_WARN_IF(rv.Failed())) {
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return rv.StealNSResult();
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}
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// Create the event
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nsCOMPtr<mozilla::dom::EventTarget> eventTarget =
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do_QueryInterface(static_cast<nsPIDOMWindow*>(targetWindow.get()));
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RefPtr<MessageEvent> event =
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new MessageEvent(eventTarget, nullptr, nullptr);
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event->InitMessageEvent(NS_LITERAL_STRING("message"), false /*non-bubbling */,
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false /*cancelable */, messageData, mCallerOrigin,
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EmptyString(), mSource);
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nsTArray<RefPtr<MessagePort>> ports = TakeTransferredPorts();
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event->SetPorts(new MessagePortList(static_cast<dom::Event*>(event.get()),
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ports));
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// We can't simply call dispatchEvent on the window because doing so ends
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// up flipping the trusted bit on the event, and we don't want that to
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// happen because then untrusted content can call postMessage on a chrome
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// window if it can get a reference to it.
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nsIPresShell *shell = targetWindow->GetExtantDoc()->GetShell();
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RefPtr<nsPresContext> presContext;
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if (shell)
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presContext = shell->GetPresContext();
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event->SetTrusted(mTrustedCaller);
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WidgetEvent* internalEvent = event->GetInternalNSEvent();
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nsEventStatus status = nsEventStatus_eIgnore;
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EventDispatcher::Dispatch(static_cast<nsPIDOMWindow*>(mTargetWindow),
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presContext,
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internalEvent,
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static_cast<dom::Event*>(event.get()),
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&status);
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return NS_OK;
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}
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} // namespace dom
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} // namespace mozilla
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