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239 lines
8.4 KiB
C++
239 lines
8.4 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=2 sw=2 et tw=78: */
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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 "WindowNamedPropertiesHandler.h"
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#include "mozilla/dom/WindowBinding.h"
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#include "nsDOMClassInfo.h"
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#include "nsGlobalWindow.h"
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#include "nsHTMLDocument.h"
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#include "nsJSUtils.h"
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#include "xpcprivate.h"
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namespace mozilla {
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namespace dom {
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static bool
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ShouldExposeChildWindow(nsString& aNameBeingResolved, nsIDOMWindow *aChild)
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{
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// If we're same-origin with the child, go ahead and expose it.
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nsCOMPtr<nsIScriptObjectPrincipal> sop = do_QueryInterface(aChild);
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NS_ENSURE_TRUE(sop, false);
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if (nsContentUtils::GetSubjectPrincipal()->Equals(sop->GetPrincipal())) {
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return true;
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}
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// If we're not same-origin, expose it _only_ if the name of the browsing
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// context matches the 'name' attribute of the frame element in the parent.
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// The motivations behind this heuristic are worth explaining here.
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//
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// Historically, all UAs supported global named access to any child browsing
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// context (that is to say, window.dolske returns a child frame where either
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// the "name" attribute on the frame element was set to "dolske", or where
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// the child explicitly set window.name = "dolske").
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//
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// This is problematic because it allows possibly-malicious and unrelated
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// cross-origin subframes to pollute the global namespace of their parent in
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// unpredictable ways (see bug 860494). This is also problematic for browser
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// engines like Servo that want to run cross-origin script on different
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// threads.
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//
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// The naive solution here would be to filter out any cross-origin subframes
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// obtained when doing named lookup in global scope. But that is unlikely to
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// be web-compatible, since it will break named access for consumers that do
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// <iframe name="dolske" src="http://cross-origin.com/sadtrombone.html"> and
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// expect to be able to access the cross-origin subframe via named lookup on
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// the global.
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//
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// The optimal behavior would be to do the following:
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// (a) Look for any child browsing context with name="dolske".
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// (b) If the result is cross-origin, null it out.
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// (c) If we have null, look for a frame element whose 'name' attribute is
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// "dolske".
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//
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// Unfortunately, (c) would require some engineering effort to be performant
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// in Gecko, and probably in other UAs as well. So we go with a simpler
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// approximation of the above. This approximation will only break sites that
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// rely on their cross-origin subframes setting window.name to a known value,
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// which is unlikely to be very common. And while it does introduce a
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// dependency on cross-origin state when doing global lookups, it doesn't
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// allow the child to arbitrarily pollute the parent namespace, and requires
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// cross-origin communication only in a limited set of cases that can be
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// computed independently by the parent.
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nsCOMPtr<nsPIDOMWindow> piWin = do_QueryInterface(aChild);
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NS_ENSURE_TRUE(piWin, false);
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Element* e = piWin->GetFrameElementInternal();
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return e && e->AttrValueIs(kNameSpaceID_None, nsGkAtoms::name,
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aNameBeingResolved, eCaseMatters);
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}
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static nsGlobalWindow*
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GetWindowFromGlobal(JSObject* aGlobal)
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{
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nsGlobalWindow* win;
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if (NS_SUCCEEDED(UNWRAP_OBJECT(Window, aGlobal, win))) {
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return win;
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}
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XPCWrappedNative* wrapper = XPCWrappedNative::Get(aGlobal);
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nsCOMPtr<nsPIDOMWindow> piWin = do_QueryWrappedNative(wrapper);
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MOZ_ASSERT(piWin);
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return static_cast<nsGlobalWindow*>(piWin.get());
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}
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bool
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WindowNamedPropertiesHandler::getOwnPropertyDescriptor(JSContext* aCx,
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JS::Handle<JSObject*> aProxy,
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JS::Handle<jsid> aId,
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JS::MutableHandle<JSPropertyDescriptor> aDesc,
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unsigned aFlags)
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{
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if (!JSID_IS_STRING(aId)) {
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// Nothing to do if we're resolving a non-string property.
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return true;
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}
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JS::Rooted<JSObject*> global(aCx, JS_GetGlobalForObject(aCx, aProxy));
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if (HasPropertyOnPrototype(aCx, aProxy, aId)) {
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return true;
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}
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nsDependentJSString str(aId);
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// Grab the DOM window.
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nsGlobalWindow* win = GetWindowFromGlobal(global);
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if (win->Length() > 0) {
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nsCOMPtr<nsIDOMWindow> childWin = win->GetChildWindow(str);
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if (childWin && ShouldExposeChildWindow(str, childWin)) {
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// We found a subframe of the right name. Shadowing via |var foo| in
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// global scope is still allowed, since |var| only looks up |own|
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// properties. But unqualified shadowing will fail, per-spec.
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JS::Rooted<JS::Value> v(aCx);
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if (!WrapObject(aCx, aProxy, childWin, &v)) {
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return false;
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}
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aDesc.object().set(aProxy);
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aDesc.value().set(v);
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aDesc.setAttributes(JSPROP_ENUMERATE);
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return true;
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}
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}
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// The rest of this function is for HTML documents only.
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nsCOMPtr<nsIHTMLDocument> htmlDoc = do_QueryInterface(win->GetExtantDoc());
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if (!htmlDoc) {
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return true;
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}
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nsHTMLDocument* document = static_cast<nsHTMLDocument*>(htmlDoc.get());
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Element* element = document->GetElementById(str);
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if (element) {
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JS::Rooted<JS::Value> v(aCx);
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if (!WrapObject(aCx, aProxy, element, &v)) {
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return false;
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}
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aDesc.object().set(aProxy);
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aDesc.value().set(v);
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aDesc.setAttributes(JSPROP_ENUMERATE);
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return true;
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}
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nsWrapperCache* cache;
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nsISupports* result = document->ResolveName(str, &cache);
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if (!result) {
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return true;
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}
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JS::Rooted<JS::Value> v(aCx);
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if (!WrapObject(aCx, aProxy, result, cache, nullptr, &v)) {
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return false;
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}
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aDesc.object().set(aProxy);
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aDesc.value().set(v);
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aDesc.setAttributes(JSPROP_ENUMERATE);
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return true;
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}
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bool
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WindowNamedPropertiesHandler::defineProperty(JSContext* aCx,
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JS::Handle<JSObject*> aProxy,
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JS::Handle<jsid> aId,
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JS::MutableHandle<JSPropertyDescriptor> aDesc)
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{
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ErrorResult rv;
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rv.ThrowTypeError(MSG_DEFINEPROPERTY_ON_GSP);
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rv.ReportTypeError(aCx);
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return false;
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}
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bool
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WindowNamedPropertiesHandler::getOwnPropertyNames(JSContext* aCx,
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JS::Handle<JSObject*> aProxy,
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JS::AutoIdVector& aProps)
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{
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// Grab the DOM window.
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nsGlobalWindow* win = GetWindowFromGlobal(JS_GetGlobalForObject(aCx, aProxy));
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nsTArray<nsString> names;
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win->GetSupportedNames(names);
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if (!AppendNamedPropertyIds(aCx, aProxy, names, false, aProps)) {
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return false;
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}
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names.Clear();
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nsCOMPtr<nsIHTMLDocument> htmlDoc = do_QueryInterface(win->GetExtantDoc());
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if (!htmlDoc) {
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return true;
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}
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nsHTMLDocument* document = static_cast<nsHTMLDocument*>(htmlDoc.get());
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document->GetSupportedNames(names);
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JS::AutoIdVector docProps(aCx);
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if (!AppendNamedPropertyIds(aCx, aProxy, names, false, docProps)) {
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return false;
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}
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return js::AppendUnique(aCx, aProps, docProps);
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}
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bool
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WindowNamedPropertiesHandler::delete_(JSContext* aCx,
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JS::Handle<JSObject*> aProxy,
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JS::Handle<jsid> aId, bool* aBp)
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{
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*aBp = false;
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return true;
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}
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// static
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void
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WindowNamedPropertiesHandler::Install(JSContext* aCx,
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JS::Handle<JSObject*> aProto)
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{
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JS::Rooted<JSObject*> protoProto(aCx);
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if (!::JS_GetPrototype(aCx, aProto, &protoProto)) {
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return;
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}
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// Note: since the scope polluter proxy lives on the window's prototype
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// chain, it needs a singleton type to avoid polluting type information
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// for properties on the window.
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JS::Rooted<JSObject*> gsp(aCx);
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js::ProxyOptions options;
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options.setSingleton(true);
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gsp = js::NewProxyObject(aCx, WindowNamedPropertiesHandler::getInstance(),
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JS::NullHandleValue, protoProto,
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js::GetGlobalForObjectCrossCompartment(aProto),
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options);
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if (!gsp) {
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return;
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}
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// And then set the prototype of the interface prototype object to be the
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// global scope polluter.
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::JS_SplicePrototype(aCx, aProto, gsp);
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}
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} // namespace dom
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} // namespace mozilla
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