gecko-dev/dom/base/ThirdPartyUtil.cpp

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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 "ThirdPartyUtil.h"
#include "nsNetCID.h"
#include "nsNetUtil.h"
#include "nsIChannel.h"
#include "nsIServiceManager.h"
#include "nsIHttpChannelInternal.h"
#include "nsIDOMWindow.h"
#include "nsILoadContext.h"
#include "nsIPrincipal.h"
#include "nsIScriptObjectPrincipal.h"
#include "nsIURI.h"
#include "nsReadableUtils.h"
#include "nsThreadUtils.h"
#include "mozilla/ClearOnShutdown.h"
#include "mozilla/Logging.h"
#include "mozilla/StaticPtr.h"
#include "mozilla/Unused.h"
#include "nsPIDOMWindow.h"
NS_IMPL_ISUPPORTS(ThirdPartyUtil, mozIThirdPartyUtil)
//
// MOZ_LOG=thirdPartyUtil:5
//
static mozilla::LazyLogModule gThirdPartyLog("thirdPartyUtil");
#undef LOG
#define LOG(args) MOZ_LOG(gThirdPartyLog, mozilla::LogLevel::Debug, args)
static mozilla::StaticRefPtr<ThirdPartyUtil> gService;
// static
void ThirdPartyUtil::Startup() {
nsCOMPtr<mozIThirdPartyUtil> tpu;
if (NS_WARN_IF(!(tpu = do_GetService(THIRDPARTYUTIL_CONTRACTID)))) {
NS_WARNING("Failed to get third party util!");
}
}
nsresult ThirdPartyUtil::Init() {
NS_ENSURE_TRUE(NS_IsMainThread(), NS_ERROR_NOT_AVAILABLE);
MOZ_ASSERT(!gService);
gService = this;
mozilla::ClearOnShutdown(&gService);
mTLDService = nsEffectiveTLDService::GetInstance();
return mTLDService ? NS_OK : NS_ERROR_FAILURE;
}
ThirdPartyUtil::~ThirdPartyUtil() { gService = nullptr; }
// static
ThirdPartyUtil* ThirdPartyUtil::GetInstance() {
if (gService) {
return gService;
}
nsCOMPtr<mozIThirdPartyUtil> tpuService =
mozilla::services::GetThirdPartyUtil();
if (!tpuService) {
return nullptr;
}
MOZ_ASSERT(
gService,
"gService must have been initialized in nsEffectiveTLDService::Init");
return gService;
}
// Determine if aFirstDomain is a different base domain to aSecondURI; or, if
// the concept of base domain does not apply, determine if the two hosts are not
// string-identical.
nsresult ThirdPartyUtil::IsThirdPartyInternal(const nsCString& aFirstDomain,
nsIURI* aSecondURI,
bool* aResult) {
if (!aSecondURI) {
return NS_ERROR_INVALID_ARG;
}
// Get the base domain for aSecondURI.
nsAutoCString secondDomain;
nsresult rv = GetBaseDomain(aSecondURI, secondDomain);
LOG(("ThirdPartyUtil::IsThirdPartyInternal %s =? %s", aFirstDomain.get(),
secondDomain.get()));
if (NS_FAILED(rv)) return rv;
*aResult = IsThirdPartyInternal(aFirstDomain, secondDomain);
return NS_OK;
}
NS_IMETHODIMP
ThirdPartyUtil::GetPrincipalFromWindow(mozIDOMWindowProxy* aWin,
nsIPrincipal** result) {
nsCOMPtr<nsIScriptObjectPrincipal> scriptObjPrin = do_QueryInterface(aWin);
if (!scriptObjPrin) {
return NS_ERROR_INVALID_ARG;
}
nsCOMPtr<nsIPrincipal> prin = scriptObjPrin->GetPrincipal();
if (!prin) {
return NS_ERROR_INVALID_ARG;
}
prin.forget(result);
return NS_OK;
}
// Get the URI associated with a window.
NS_IMETHODIMP
ThirdPartyUtil::GetURIFromWindow(mozIDOMWindowProxy* aWin, nsIURI** result) {
nsCOMPtr<nsIPrincipal> prin;
nsresult rv = GetPrincipalFromWindow(aWin, getter_AddRefs(prin));
if (NS_FAILED(rv)) {
return rv;
}
if (prin->GetIsNullPrincipal()) {
LOG(("ThirdPartyUtil::GetURIFromWindow can't use null principal\n"));
return NS_ERROR_INVALID_ARG;
}
rv = prin->GetURI(result);
return rv;
}
// Determine if aFirstURI is third party with respect to aSecondURI. See docs
// for mozIThirdPartyUtil.
NS_IMETHODIMP
ThirdPartyUtil::IsThirdPartyURI(nsIURI* aFirstURI, nsIURI* aSecondURI,
bool* aResult) {
NS_ENSURE_ARG(aFirstURI);
NS_ENSURE_ARG(aSecondURI);
NS_ASSERTION(aResult, "null outparam pointer");
nsAutoCString firstHost;
nsresult rv = GetBaseDomain(aFirstURI, firstHost);
if (NS_FAILED(rv)) return rv;
return IsThirdPartyInternal(firstHost, aSecondURI, aResult);
}
// Determine if any URI of the window hierarchy of aWindow is foreign with
// respect to aSecondURI. See docs for mozIThirdPartyUtil.
NS_IMETHODIMP
ThirdPartyUtil::IsThirdPartyWindow(mozIDOMWindowProxy* aWindow, nsIURI* aURI,
bool* aResult) {
NS_ENSURE_ARG(aWindow);
NS_ASSERTION(aResult, "null outparam pointer");
bool result;
nsCString bottomDomain =
GetBaseDomainFromWindow(nsPIDOMWindowOuter::From(aWindow));
if (bottomDomain.IsEmpty()) {
// We may have an about:blank window here. Fall back to the slower code
// path which is principal aware.
nsCOMPtr<nsIURI> currentURI;
nsresult rv = GetURIFromWindow(aWindow, getter_AddRefs(currentURI));
if (NS_FAILED(rv)) {
return rv;
}
rv = GetBaseDomain(currentURI, bottomDomain);
if (NS_FAILED(rv)) {
return rv;
}
}
if (aURI) {
// Determine whether aURI is foreign with respect to currentURI.
nsresult rv = IsThirdPartyInternal(bottomDomain, aURI, &result);
if (NS_FAILED(rv)) return rv;
if (result) {
*aResult = true;
return NS_OK;
}
}
nsPIDOMWindowOuter* current = nsPIDOMWindowOuter::From(aWindow);
do {
// We use GetScriptableParent rather than GetParent because we consider
// <iframe mozbrowser> to be a top-level frame.
nsPIDOMWindowOuter* parent = current->GetScriptableParent();
// We don't use SameCOMIdentity here since we know that nsPIDOMWindowOuter
// is only implemented by nsGlobalWindowOuter, so different objects of that
// type will not have different nsISupports COM identities, and checking the
// actual COM identity using SameCOMIdentity is expensive due to the virtual
// calls involved.
if (parent == current) {
// We're at the topmost content window. We already know the answer.
*aResult = false;
return NS_OK;
}
nsCString parentDomain = GetBaseDomainFromWindow(parent);
if (parentDomain.IsEmpty()) {
// We may have an about:blank window here. Fall back to the slower code
// path which is principal aware.
nsCOMPtr<nsIURI> parentURI;
nsresult rv = GetURIFromWindow(parent, getter_AddRefs(parentURI));
NS_ENSURE_SUCCESS(rv, rv);
rv = IsThirdPartyInternal(bottomDomain, parentURI, &result);
if (NS_FAILED(rv)) {
return rv;
}
} else {
result = IsThirdPartyInternal(bottomDomain, parentDomain);
}
if (result) {
*aResult = true;
return NS_OK;
}
current = parent;
} while (1);
MOZ_ASSERT_UNREACHABLE("should've returned");
return NS_ERROR_UNEXPECTED;
}
// Determine if the URI associated with aChannel or any URI of the window
// hierarchy associated with the channel is foreign with respect to aSecondURI.
// See docs for mozIThirdPartyUtil.
NS_IMETHODIMP
ThirdPartyUtil::IsThirdPartyChannel(nsIChannel* aChannel, nsIURI* aURI,
bool* aResult) {
LOG(("ThirdPartyUtil::IsThirdPartyChannel [channel=%p]", aChannel));
NS_ENSURE_ARG(aChannel);
NS_ASSERTION(aResult, "null outparam pointer");
nsresult rv;
bool doForce = false;
nsCOMPtr<nsIHttpChannelInternal> httpChannelInternal =
do_QueryInterface(aChannel);
if (httpChannelInternal) {
uint32_t flags = 0;
// Avoid checking the return value here since some channel implementations
// may return NS_ERROR_NOT_IMPLEMENTED.
mozilla::Unused << httpChannelInternal->GetThirdPartyFlags(&flags);
doForce = (flags & nsIHttpChannelInternal::THIRD_PARTY_FORCE_ALLOW);
// If aURI was not supplied, and we're forcing, then we're by definition
// not foreign. If aURI was supplied, we still want to check whether it's
// foreign with respect to the channel URI. (The forcing only applies to
// whatever window hierarchy exists above the channel.)
if (doForce && !aURI) {
*aResult = false;
return NS_OK;
}
}
bool parentIsThird = false;
// Obtain the URI from the channel, and its base domain.
nsCOMPtr<nsIURI> channelURI;
rv = NS_GetFinalChannelURI(aChannel, getter_AddRefs(channelURI));
if (NS_FAILED(rv)) return rv;
nsAutoCString channelDomain;
rv = GetBaseDomain(channelURI, channelDomain);
if (NS_FAILED(rv)) return rv;
if (!doForce) {
if (nsCOMPtr<nsILoadInfo> loadInfo = aChannel->LoadInfo()) {
parentIsThird = loadInfo->GetIsInThirdPartyContext();
if (!parentIsThird && loadInfo->GetExternalContentPolicyType() !=
nsIContentPolicy::TYPE_DOCUMENT) {
// Check if the channel itself is third-party to its own requestor.
// Unforunately, we have to go through the loading principal.
nsCOMPtr<nsIURI> parentURI;
rv = loadInfo->LoadingPrincipal()->GetURI(getter_AddRefs(parentURI));
if (NS_SUCCEEDED(rv) && parentURI) {
// We may have a principal like the system principal here which does
// not have a URI.
rv = IsThirdPartyInternal(channelDomain, parentURI, &parentIsThird);
if (NS_FAILED(rv)) {
return rv;
}
} else {
// Found a principal with no URI, assuming third-party request
parentIsThird = true;
}
}
} else {
NS_WARNING(
"Found channel with no loadinfo, assuming third-party request");
parentIsThird = true;
}
}
// If we're not comparing to a URI, we have our answer. Otherwise, if
// parentIsThird, we're not forcing and we know that we're a third-party
// request.
if (!aURI || parentIsThird) {
*aResult = parentIsThird;
return NS_OK;
}
// Determine whether aURI is foreign with respect to channelURI.
return IsThirdPartyInternal(channelDomain, aURI, aResult);
}
NS_IMETHODIMP
ThirdPartyUtil::GetTopWindowForChannel(nsIChannel* aChannel,
nsIURI* aURIBeingLoaded,
mozIDOMWindowProxy** aWin) {
NS_ENSURE_ARG(aWin);
// Find the associated window and its parent window.
nsCOMPtr<nsILoadContext> ctx;
NS_QueryNotificationCallbacks(aChannel, ctx);
if (!ctx) {
return NS_ERROR_INVALID_ARG;
}
nsCOMPtr<mozIDOMWindowProxy> window;
ctx->GetAssociatedWindow(getter_AddRefs(window));
if (!window) {
return NS_ERROR_INVALID_ARG;
}
nsCOMPtr<nsPIDOMWindowOuter> top =
nsGlobalWindowOuter::Cast(window)
->GetTopExcludingExtensionAccessibleContentFrames(aURIBeingLoaded);
top.forget(aWin);
return NS_OK;
}
// Get the base domain for aHostURI; e.g. for "www.bbc.co.uk", this would be
// "bbc.co.uk". Only properly-formed URI's are tolerated, though a trailing
// dot may be present. If aHostURI is an IP address, an alias such as
// 'localhost', an eTLD such as 'co.uk', or the empty string, aBaseDomain will
// be the exact host. The result of this function should only be used in exact
// string comparisons, since substring comparisons will not be valid for the
// special cases elided above.
NS_IMETHODIMP
ThirdPartyUtil::GetBaseDomain(nsIURI* aHostURI, nsACString& aBaseDomain) {
if (!aHostURI) {
return NS_ERROR_INVALID_ARG;
}
// Get the base domain. this will fail if the host contains a leading dot,
// more than one trailing dot, or is otherwise malformed.
nsresult rv = mTLDService->GetBaseDomain(aHostURI, 0, aBaseDomain);
if (rv == NS_ERROR_HOST_IS_IP_ADDRESS ||
rv == NS_ERROR_INSUFFICIENT_DOMAIN_LEVELS) {
// aHostURI is either an IP address, an alias such as 'localhost', an eTLD
// such as 'co.uk', or the empty string. Uses the normalized host in such
// cases.
rv = aHostURI->GetAsciiHost(aBaseDomain);
}
NS_ENSURE_SUCCESS(rv, rv);
// aHostURI (and thus aBaseDomain) may be the string '.'. If so, fail.
if (aBaseDomain.Length() == 1 && aBaseDomain.Last() == '.')
return NS_ERROR_INVALID_ARG;
// Reject any URIs without a host that aren't file:// URIs. This makes it the
// only way we can get a base domain consisting of the empty string, which
// means we can safely perform foreign tests on such URIs where "not foreign"
// means "the involved URIs are all file://".
if (aBaseDomain.IsEmpty()) {
bool isFileURI = false;
aHostURI->SchemeIs("file", &isFileURI);
if (!isFileURI) {
return NS_ERROR_INVALID_ARG;
}
}
return NS_OK;
}
NS_IMETHODIMP
ThirdPartyUtil::GetBaseDomainFromSchemeHost(const nsACString& aScheme,
const nsACString& aAsciiHost,
nsACString& aBaseDomain) {
MOZ_DIAGNOSTIC_ASSERT(IsASCII(aAsciiHost));
// Get the base domain. this will fail if the host contains a leading dot,
// more than one trailing dot, or is otherwise malformed.
nsresult rv = mTLDService->GetBaseDomainFromHost(aAsciiHost, 0, aBaseDomain);
if (rv == NS_ERROR_HOST_IS_IP_ADDRESS ||
rv == NS_ERROR_INSUFFICIENT_DOMAIN_LEVELS) {
// aMozURL is either an IP address, an alias such as 'localhost', an eTLD
// such as 'co.uk', or the empty string. Uses the normalized host in such
// cases.
aBaseDomain = aAsciiHost;
rv = NS_OK;
}
NS_ENSURE_SUCCESS(rv, rv);
// aMozURL (and thus aBaseDomain) may be the string '.'. If so, fail.
if (aBaseDomain.Length() == 1 && aBaseDomain.Last() == '.')
return NS_ERROR_INVALID_ARG;
// Reject any URLs without a host that aren't file:// URLs. This makes it the
// only way we can get a base domain consisting of the empty string, which
// means we can safely perform foreign tests on such URLs where "not foreign"
// means "the involved URLs are all file://".
if (aBaseDomain.IsEmpty() && !aScheme.EqualsLiteral("file")) {
return NS_ERROR_INVALID_ARG;
}
return NS_OK;
}