forked from mirrors/gecko-dev
09e7cbd0b7
Backed out changeset 455ce831c73c (bug 1876575) Backed out changeset 4fa3fbf3a3ae (bug 1876575) Backed out changeset ac4c41cb3b67 (bug 1876575) Backed out changeset 15e06d10788e (bug 1876575) Backed out changeset dcd6bbea816a (bug 1876575) Backed out changeset cc547125fda9 (bug 1876574)
532 lines
17 KiB
C++
532 lines
17 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 "ThirdPartyUtil.h"
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#include <cstdint>
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#include "MainThreadUtils.h"
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#include "mozIDOMWindow.h"
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#include "mozilla/AlreadyAddRefed.h"
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#include "mozilla/Assertions.h"
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#include "mozilla/BasePrincipal.h"
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#include "mozilla/ClearOnShutdown.h"
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#include "mozilla/ContentBlockingNotifier.h"
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#include "mozilla/Logging.h"
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#include "mozilla/MacroForEach.h"
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#include "mozilla/Components.h"
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#include "mozilla/StaticPtr.h"
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#include "mozilla/StorageAccess.h"
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#include "mozilla/TextUtils.h"
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#include "mozilla/Unused.h"
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#include "mozilla/dom/BrowsingContext.h"
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#include "mozilla/dom/CanonicalBrowsingContext.h"
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#include "mozilla/dom/Document.h"
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#include "mozilla/dom/WindowContext.h"
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#include "mozilla/dom/WindowGlobalParent.h"
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#include "nsCOMPtr.h"
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#include "nsDebug.h"
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#include "nsEffectiveTLDService.h"
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#include "nsError.h"
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#include "nsGlobalWindowOuter.h"
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#include "nsIChannel.h"
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#include "nsIClassifiedChannel.h"
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#include "nsIContentPolicy.h"
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#include "nsIHttpChannelInternal.h"
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#include "nsILoadContext.h"
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#include "nsILoadInfo.h"
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#include "nsIPrincipal.h"
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#include "nsIScriptObjectPrincipal.h"
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#include "nsIURI.h"
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#include "nsLiteralString.h"
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#include "nsNetUtil.h"
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#include "nsPIDOMWindow.h"
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#include "nsPIDOMWindowInlines.h"
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#include "nsServiceManagerUtils.h"
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#include "nsTLiteralString.h"
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using namespace mozilla;
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using namespace mozilla::dom;
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NS_IMPL_ISUPPORTS(ThirdPartyUtil, mozIThirdPartyUtil)
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//
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// MOZ_LOG=thirdPartyUtil:5
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//
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static mozilla::LazyLogModule gThirdPartyLog("thirdPartyUtil");
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#undef LOG
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#define LOG(args) MOZ_LOG(gThirdPartyLog, mozilla::LogLevel::Debug, args)
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static mozilla::StaticRefPtr<ThirdPartyUtil> gService;
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// static
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void ThirdPartyUtil::Startup() {
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nsCOMPtr<mozIThirdPartyUtil> tpu;
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if (NS_WARN_IF(!(tpu = do_GetService(THIRDPARTYUTIL_CONTRACTID)))) {
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NS_WARNING("Failed to get third party util!");
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}
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}
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nsresult ThirdPartyUtil::Init() {
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NS_ENSURE_TRUE(NS_IsMainThread(), NS_ERROR_NOT_AVAILABLE);
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MOZ_ASSERT(!gService);
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gService = this;
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mozilla::ClearOnShutdown(&gService);
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mTLDService = nsEffectiveTLDService::GetInstance();
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return mTLDService ? NS_OK : NS_ERROR_FAILURE;
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}
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ThirdPartyUtil::~ThirdPartyUtil() { gService = nullptr; }
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// static
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ThirdPartyUtil* ThirdPartyUtil::GetInstance() {
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if (gService) {
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return gService;
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}
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nsCOMPtr<mozIThirdPartyUtil> tpuService =
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mozilla::components::ThirdPartyUtil::Service();
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if (!tpuService) {
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return nullptr;
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}
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MOZ_ASSERT(
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gService,
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"gService must have been initialized in nsEffectiveTLDService::Init");
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return gService;
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}
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// Determine if aFirstDomain is a different base domain to aSecondURI; or, if
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// the concept of base domain does not apply, determine if the two hosts are not
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// string-identical.
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nsresult ThirdPartyUtil::IsThirdPartyInternal(const nsCString& aFirstDomain,
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nsIURI* aSecondURI,
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bool* aResult) {
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if (!aSecondURI) {
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return NS_ERROR_INVALID_ARG;
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}
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// BlobURLs are always first-party.
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if (aSecondURI->SchemeIs("blob")) {
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*aResult = false;
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return NS_OK;
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}
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// Get the base domain for aSecondURI.
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nsAutoCString secondDomain;
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nsresult rv = GetBaseDomain(aSecondURI, secondDomain);
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LOG(("ThirdPartyUtil::IsThirdPartyInternal %s =? %s", aFirstDomain.get(),
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secondDomain.get()));
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if (NS_FAILED(rv)) {
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return rv;
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}
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*aResult = IsThirdPartyInternal(aFirstDomain, secondDomain);
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return NS_OK;
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}
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nsCString ThirdPartyUtil::GetBaseDomainFromWindow(nsPIDOMWindowOuter* aWindow) {
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mozilla::dom::Document* doc = aWindow ? aWindow->GetExtantDoc() : nullptr;
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if (!doc) {
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return ""_ns;
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}
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return doc->GetBaseDomain();
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}
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NS_IMETHODIMP
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ThirdPartyUtil::GetPrincipalFromWindow(mozIDOMWindowProxy* aWin,
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nsIPrincipal** result) {
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nsCOMPtr<nsIScriptObjectPrincipal> scriptObjPrin = do_QueryInterface(aWin);
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if (!scriptObjPrin) {
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return NS_ERROR_INVALID_ARG;
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}
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nsCOMPtr<nsIPrincipal> prin = scriptObjPrin->GetPrincipal();
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if (!prin) {
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return NS_ERROR_INVALID_ARG;
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}
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prin.forget(result);
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return NS_OK;
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}
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// Get the URI associated with a window.
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NS_IMETHODIMP
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ThirdPartyUtil::GetURIFromWindow(mozIDOMWindowProxy* aWin, nsIURI** result) {
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nsCOMPtr<nsIPrincipal> prin;
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nsresult rv = GetPrincipalFromWindow(aWin, getter_AddRefs(prin));
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if (NS_FAILED(rv)) {
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return rv;
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}
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if (prin->GetIsNullPrincipal()) {
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LOG(("ThirdPartyUtil::GetURIFromWindow can't use null principal\n"));
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return NS_ERROR_INVALID_ARG;
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}
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auto* basePrin = BasePrincipal::Cast(prin);
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return basePrin->GetURI(result);
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}
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// Determine if aFirstURI is third party with respect to aSecondURI. See docs
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// for mozIThirdPartyUtil.
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NS_IMETHODIMP
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ThirdPartyUtil::IsThirdPartyURI(nsIURI* aFirstURI, nsIURI* aSecondURI,
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bool* aResult) {
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NS_ENSURE_ARG(aFirstURI);
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NS_ENSURE_ARG(aSecondURI);
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NS_ASSERTION(aResult, "null outparam pointer");
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nsAutoCString firstHost;
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nsresult rv = GetBaseDomain(aFirstURI, firstHost);
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if (NS_FAILED(rv)) {
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return rv;
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}
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return IsThirdPartyInternal(firstHost, aSecondURI, aResult);
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}
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// If the optional aURI is provided, determine whether aWindow is foreign with
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// respect to aURI. If the optional aURI is not provided, determine whether the
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// given "window hierarchy" is third party. See docs for mozIThirdPartyUtil.
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NS_IMETHODIMP
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ThirdPartyUtil::IsThirdPartyWindow(mozIDOMWindowProxy* aWindow, nsIURI* aURI,
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bool* aResult) {
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NS_ENSURE_ARG(aWindow);
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NS_ASSERTION(aResult, "null outparam pointer");
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bool result;
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// Ignore about:blank URIs here since they have no domain and attempting to
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// compare against them will fail.
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if (aURI && !NS_IsAboutBlank(aURI)) {
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nsCOMPtr<nsIPrincipal> prin;
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nsresult rv = GetPrincipalFromWindow(aWindow, getter_AddRefs(prin));
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NS_ENSURE_SUCCESS(rv, rv);
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// Determine whether aURI is foreign with respect to the current principal.
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rv = prin->IsThirdPartyURI(aURI, &result);
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if (NS_FAILED(rv)) {
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return rv;
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}
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if (result) {
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*aResult = true;
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return NS_OK;
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}
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}
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nsPIDOMWindowOuter* current = nsPIDOMWindowOuter::From(aWindow);
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auto* const browsingContext = current->GetBrowsingContext();
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MOZ_ASSERT(browsingContext);
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WindowContext* wc = browsingContext->GetCurrentWindowContext();
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if (NS_WARN_IF(!wc)) {
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*aResult = true;
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return NS_OK;
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}
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*aResult = wc->GetIsThirdPartyWindow();
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return NS_OK;
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}
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nsresult ThirdPartyUtil::IsThirdPartyGlobal(
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mozilla::dom::WindowGlobalParent* aWindowGlobal, bool* aResult) {
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NS_ENSURE_ARG(aWindowGlobal);
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NS_ASSERTION(aResult, "null outparam pointer");
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auto* currentWGP = aWindowGlobal;
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do {
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MOZ_ASSERT(currentWGP->BrowsingContext());
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if (currentWGP->BrowsingContext()->IsTop()) {
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*aResult = false;
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return NS_OK;
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}
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nsCOMPtr<nsIPrincipal> currentPrincipal = currentWGP->DocumentPrincipal();
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RefPtr<WindowGlobalParent> parent =
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currentWGP->BrowsingContext()->GetEmbedderWindowGlobal();
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if (!parent) {
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return NS_ERROR_FAILURE;
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}
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nsCOMPtr<nsIPrincipal> parentPrincipal = parent->DocumentPrincipal();
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nsresult rv =
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currentPrincipal->IsThirdPartyPrincipal(parentPrincipal, aResult);
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if (NS_FAILED(rv)) {
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return rv;
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}
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if (*aResult) {
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return NS_OK;
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}
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currentWGP = parent;
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} while (true);
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}
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// Determine if the URI associated with aChannel or any URI of the window
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// hierarchy associated with the channel is foreign with respect to aSecondURI.
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// See docs for mozIThirdPartyUtil.
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NS_IMETHODIMP
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ThirdPartyUtil::IsThirdPartyChannel(nsIChannel* aChannel, nsIURI* aURI,
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bool* aResult) {
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LOG(("ThirdPartyUtil::IsThirdPartyChannel [channel=%p]", aChannel));
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NS_ENSURE_ARG(aChannel);
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NS_ASSERTION(aResult, "null outparam pointer");
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nsresult rv;
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bool doForce = false;
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nsCOMPtr<nsIHttpChannelInternal> httpChannelInternal =
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do_QueryInterface(aChannel);
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if (httpChannelInternal) {
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uint32_t flags = 0;
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// Avoid checking the return value here since some channel implementations
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// may return NS_ERROR_NOT_IMPLEMENTED.
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mozilla::Unused << httpChannelInternal->GetThirdPartyFlags(&flags);
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doForce = (flags & nsIHttpChannelInternal::THIRD_PARTY_FORCE_ALLOW);
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// If aURI was not supplied, and we're forcing, then we're by definition
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// not foreign. If aURI was supplied, we still want to check whether it's
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// foreign with respect to the channel URI. (The forcing only applies to
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// whatever window hierarchy exists above the channel.)
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if (doForce && !aURI) {
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*aResult = false;
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return NS_OK;
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}
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}
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bool parentIsThird = false;
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nsAutoCString channelDomain;
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// Obtain the URI from the channel, and its base domain.
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nsCOMPtr<nsIURI> channelURI;
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rv = NS_GetFinalChannelURI(aChannel, getter_AddRefs(channelURI));
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if (NS_FAILED(rv)) {
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return rv;
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}
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BasePrincipal* loadingPrincipal = nullptr;
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nsCOMPtr<nsILoadInfo> loadInfo = aChannel->LoadInfo();
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if (!doForce) {
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parentIsThird = loadInfo->GetIsInThirdPartyContext();
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if (!parentIsThird && loadInfo->GetExternalContentPolicyType() !=
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ExtContentPolicy::TYPE_DOCUMENT) {
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// Check if the channel itself is third-party to its own requestor.
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// Unfortunately, we have to go through the loading principal.
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loadingPrincipal = BasePrincipal::Cast(loadInfo->GetLoadingPrincipal());
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}
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}
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// Special consideration must be done for about:blank URIs because those
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// inherit the principal from the parent context. For them, let's consider the
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// principal URI.
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if (NS_IsAboutBlank(channelURI)) {
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nsCOMPtr<nsIPrincipal> principalToInherit =
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loadInfo->FindPrincipalToInherit(aChannel);
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if (!principalToInherit) {
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*aResult = true;
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return NS_OK;
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}
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rv = principalToInherit->GetBaseDomain(channelDomain);
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if (NS_FAILED(rv)) {
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return rv;
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}
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if (loadingPrincipal) {
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rv = loadingPrincipal->IsThirdPartyPrincipal(principalToInherit,
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&parentIsThird);
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if (NS_FAILED(rv)) {
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return rv;
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}
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}
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} else {
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rv = GetBaseDomain(channelURI, channelDomain);
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if (NS_FAILED(rv)) {
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return rv;
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}
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if (loadingPrincipal) {
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rv = loadingPrincipal->IsThirdPartyURI(channelURI, &parentIsThird);
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if (NS_FAILED(rv)) {
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return rv;
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}
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}
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}
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// If we're not comparing to a URI, we have our answer. Otherwise, if
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// parentIsThird, we're not forcing and we know that we're a third-party
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// request.
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if (!aURI || parentIsThird) {
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*aResult = parentIsThird;
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return NS_OK;
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}
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// Determine whether aURI is foreign with respect to channelURI.
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return IsThirdPartyInternal(channelDomain, aURI, aResult);
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}
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NS_IMETHODIMP
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ThirdPartyUtil::GetTopWindowForChannel(nsIChannel* aChannel,
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nsIURI* aURIBeingLoaded,
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mozIDOMWindowProxy** aWin) {
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NS_ENSURE_ARG(aWin);
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// Find the associated window and its parent window.
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nsCOMPtr<nsILoadContext> ctx;
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NS_QueryNotificationCallbacks(aChannel, ctx);
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if (!ctx) {
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return NS_ERROR_INVALID_ARG;
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}
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nsCOMPtr<mozIDOMWindowProxy> window;
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ctx->GetAssociatedWindow(getter_AddRefs(window));
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if (!window) {
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return NS_ERROR_INVALID_ARG;
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}
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nsCOMPtr<nsPIDOMWindowOuter> top =
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nsGlobalWindowOuter::Cast(window)
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->GetTopExcludingExtensionAccessibleContentFrames(aURIBeingLoaded);
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top.forget(aWin);
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return NS_OK;
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}
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// Get the base domain for aHostURI; e.g. for "www.bbc.co.uk", this would be
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// "bbc.co.uk". Only properly-formed URI's are tolerated, though a trailing
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// dot may be present. If aHostURI is an IP address, an alias such as
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// 'localhost', an eTLD such as 'co.uk', or the empty string, aBaseDomain will
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// be the exact host. The result of this function should only be used in exact
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// string comparisons, since substring comparisons will not be valid for the
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// special cases elided above.
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NS_IMETHODIMP
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ThirdPartyUtil::GetBaseDomain(nsIURI* aHostURI, nsACString& aBaseDomain) {
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if (!aHostURI) {
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return NS_ERROR_INVALID_ARG;
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}
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// Get the base domain. this will fail if the host contains a leading dot,
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// more than one trailing dot, or is otherwise malformed.
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nsresult rv = mTLDService->GetBaseDomain(aHostURI, 0, aBaseDomain);
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if (rv == NS_ERROR_HOST_IS_IP_ADDRESS ||
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rv == NS_ERROR_INSUFFICIENT_DOMAIN_LEVELS) {
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// aHostURI is either an IP address, an alias such as 'localhost', an eTLD
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// such as 'co.uk', or the empty string. Uses the normalized host in such
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// cases.
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rv = aHostURI->GetAsciiHost(aBaseDomain);
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}
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if (NS_FAILED(rv)) {
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return rv;
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}
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// aHostURI (and thus aBaseDomain) may be the string '.'. If so, fail.
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if (aBaseDomain.Length() == 1 && aBaseDomain.Last() == '.')
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return NS_ERROR_INVALID_ARG;
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// Reject any URIs without a host that aren't file:// URIs. This makes it the
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// only way we can get a base domain consisting of the empty string, which
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// means we can safely perform foreign tests on such URIs where "not foreign"
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// means "the involved URIs are all file://".
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if (aBaseDomain.IsEmpty() && !aHostURI->SchemeIs("file")) {
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return NS_ERROR_INVALID_ARG;
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}
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return NS_OK;
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}
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NS_IMETHODIMP
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ThirdPartyUtil::GetBaseDomainFromSchemeHost(const nsACString& aScheme,
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const nsACString& aAsciiHost,
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nsACString& aBaseDomain) {
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MOZ_DIAGNOSTIC_ASSERT(IsAscii(aAsciiHost));
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// Get the base domain. this will fail if the host contains a leading dot,
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// more than one trailing dot, or is otherwise malformed.
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nsresult rv = mTLDService->GetBaseDomainFromHost(aAsciiHost, 0, aBaseDomain);
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if (rv == NS_ERROR_HOST_IS_IP_ADDRESS ||
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rv == NS_ERROR_INSUFFICIENT_DOMAIN_LEVELS) {
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// aMozURL is either an IP address, an alias such as 'localhost', an eTLD
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// such as 'co.uk', or the empty string. Uses the normalized host in such
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// cases.
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aBaseDomain = aAsciiHost;
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rv = NS_OK;
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}
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NS_ENSURE_SUCCESS(rv, rv);
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// aMozURL (and thus aBaseDomain) may be the string '.'. If so, fail.
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if (aBaseDomain.Length() == 1 && aBaseDomain.Last() == '.')
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return NS_ERROR_INVALID_ARG;
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// Reject any URLs without a host that aren't file:// URLs. This makes it the
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// only way we can get a base domain consisting of the empty string, which
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// means we can safely perform foreign tests on such URLs where "not foreign"
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// means "the involved URLs are all file://".
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if (aBaseDomain.IsEmpty() && !aScheme.EqualsLiteral("file")) {
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return NS_ERROR_INVALID_ARG;
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}
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return NS_OK;
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}
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NS_IMETHODIMP_(ThirdPartyAnalysisResult)
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ThirdPartyUtil::AnalyzeChannel(nsIChannel* aChannel, bool aNotify, nsIURI* aURI,
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RequireThirdPartyCheck aRequireThirdPartyCheck,
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uint32_t* aRejectedReason) {
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MOZ_ASSERT_IF(aNotify, aRejectedReason);
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ThirdPartyAnalysisResult result;
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nsCOMPtr<nsIURI> uri;
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if (!aURI && aChannel) {
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aChannel->GetURI(getter_AddRefs(uri));
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}
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nsCOMPtr<nsILoadInfo> loadInfo = aChannel ? aChannel->LoadInfo() : nullptr;
|
|
|
|
bool isForeign = true;
|
|
if (aChannel &&
|
|
(!aRequireThirdPartyCheck || aRequireThirdPartyCheck(loadInfo))) {
|
|
IsThirdPartyChannel(aChannel, aURI ? aURI : uri.get(), &isForeign);
|
|
}
|
|
if (isForeign) {
|
|
result += ThirdPartyAnalysis::IsForeign;
|
|
}
|
|
|
|
nsCOMPtr<nsIClassifiedChannel> classifiedChannel =
|
|
do_QueryInterface(aChannel);
|
|
if (classifiedChannel) {
|
|
if (classifiedChannel->IsThirdPartyTrackingResource()) {
|
|
result += ThirdPartyAnalysis::IsThirdPartyTrackingResource;
|
|
}
|
|
if (classifiedChannel->IsThirdPartySocialTrackingResource()) {
|
|
result += ThirdPartyAnalysis::IsThirdPartySocialTrackingResource;
|
|
}
|
|
|
|
// Check first-party storage access even for non-tracking resources, since
|
|
// we will need the result when computing the access rights for the reject
|
|
// foreign cookie behavior mode.
|
|
|
|
// If the caller has requested third-party checks, we will only perform the
|
|
// storage access check once we know we're in the third-party context.
|
|
bool performStorageChecks =
|
|
aRequireThirdPartyCheck ? result.contains(ThirdPartyAnalysis::IsForeign)
|
|
: true;
|
|
if (performStorageChecks &&
|
|
ShouldAllowAccessFor(aChannel, aURI ? aURI : uri.get(),
|
|
aRejectedReason)) {
|
|
result += ThirdPartyAnalysis::IsStorageAccessPermissionGranted;
|
|
}
|
|
|
|
if (aNotify && !result.contains(
|
|
ThirdPartyAnalysis::IsStorageAccessPermissionGranted)) {
|
|
ContentBlockingNotifier::OnDecision(
|
|
aChannel, ContentBlockingNotifier::BlockingDecision::eBlock,
|
|
*aRejectedReason);
|
|
}
|
|
}
|
|
|
|
return result;
|
|
}
|