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tenfourfox/netwerk/protocol/http/nsCORSListenerProxy.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 "mozilla/Assertions.h"
#include "mozilla/LinkedList.h"
#include "nsCORSListenerProxy.h"
#include "nsIChannel.h"
#include "nsIHttpChannel.h"
#include "nsIHttpChannelChild.h"
#include "nsIHttpChannelInternal.h"
#include "nsError.h"
#include "nsContentUtils.h"
#include "nsIScriptSecurityManager.h"
#include "nsNetUtil.h"
#include "nsIInterfaceRequestorUtils.h"
#include "nsServiceManagerUtils.h"
#include "nsMimeTypes.h"
#include "nsIStreamConverterService.h"
#include "nsStringStream.h"
#include "nsGkAtoms.h"
#include "nsWhitespaceTokenizer.h"
#include "nsIChannelEventSink.h"
#include "nsIAsyncVerifyRedirectCallback.h"
#include "nsCharSeparatedTokenizer.h"
#include "nsAsyncRedirectVerifyHelper.h"
#include "nsClassHashtable.h"
#include "nsHashKeys.h"
#include "nsStreamUtils.h"
#include "mozilla/Preferences.h"
#include "nsIScriptError.h"
#include "nsILoadGroup.h"
#include "nsILoadContext.h"
#include "nsIConsoleService.h"
#include "nsIDOMNode.h"
#include "nsIDOMWindowUtils.h"
#include "nsIDOMWindow.h"
#include "nsINetworkInterceptController.h"
#include "nsNullPrincipal.h"
#include "nsICorsPreflightCallback.h"
#include "mozilla/LoadInfo.h"
#include <algorithm>
using namespace mozilla;
#define PREFLIGHT_CACHE_SIZE 100
static bool gDisableCORS = false;
static bool gDisableCORSPrivateData = false;
static void
LogBlockedRequest(nsIRequest* aRequest,
const char* aProperty,
const char16_t* aParam)
{
nsresult rv = NS_OK;
// Build the error object and log it to the console
nsCOMPtr<nsIConsoleService> console(do_GetService(NS_CONSOLESERVICE_CONTRACTID, &rv));
if (NS_FAILED(rv)) {
NS_WARNING("Failed to log blocked cross-site request (no console)");
return;
}
nsCOMPtr<nsIScriptError> scriptError =
do_CreateInstance(NS_SCRIPTERROR_CONTRACTID, &rv);
if (NS_FAILED(rv)) {
NS_WARNING("Failed to log blocked cross-site request (no scriptError)");
return;
}
nsCOMPtr<nsIChannel> channel = do_QueryInterface(aRequest);
nsCOMPtr<nsIURI> aUri;
channel->GetURI(getter_AddRefs(aUri));
nsAutoCString spec;
if (aUri) {
aUri->GetSpec(spec);
}
// Generate the error message
nsXPIDLString blockedMessage;
NS_ConvertUTF8toUTF16 specUTF16(spec);
const char16_t* params[] = { specUTF16.get(), aParam };
rv = nsContentUtils::FormatLocalizedString(nsContentUtils::eSECURITY_PROPERTIES,
aProperty,
params,
blockedMessage);
if (NS_FAILED(rv)) {
NS_WARNING("Failed to log blocked cross-site request (no formalizedStr");
return;
}
nsAutoString msg(blockedMessage.get());
// query innerWindowID and log to web console, otherwise log to
// the error to the browser console.
uint64_t innerWindowID = nsContentUtils::GetInnerWindowID(aRequest);
if (innerWindowID > 0) {
rv = scriptError->InitWithWindowID(msg,
EmptyString(), // sourceName
EmptyString(), // sourceLine
0, // lineNumber
0, // columnNumber
nsIScriptError::warningFlag,
"CORS",
innerWindowID);
}
else {
rv = scriptError->Init(msg,
EmptyString(), // sourceName
EmptyString(), // sourceLine
0, // lineNumber
0, // columnNumber
nsIScriptError::warningFlag,
"CORS");
}
if (NS_FAILED(rv)) {
NS_WARNING("Failed to log blocked cross-site request (scriptError init failed)");
return;
}
console->LogMessage(scriptError);
}
//////////////////////////////////////////////////////////////////////////
// Preflight cache
class nsPreflightCache
{
public:
struct TokenTime
{
nsCString token;
TimeStamp expirationTime;
};
struct CacheEntry : public LinkedListElement<CacheEntry>
{
explicit CacheEntry(nsCString& aKey)
: mKey(aKey)
{
MOZ_COUNT_CTOR(nsPreflightCache::CacheEntry);
}
~CacheEntry()
{
MOZ_COUNT_DTOR(nsPreflightCache::CacheEntry);
}
void PurgeExpired(TimeStamp now);
bool CheckRequest(const nsCString& aMethod,
const nsTArray<nsCString>& aCustomHeaders);
nsCString mKey;
nsTArray<TokenTime> mMethods;
nsTArray<TokenTime> mHeaders;
};
nsPreflightCache()
{
MOZ_COUNT_CTOR(nsPreflightCache);
}
~nsPreflightCache()
{
Clear();
MOZ_COUNT_DTOR(nsPreflightCache);
}
bool Initialize()
{
return true;
}
CacheEntry* GetEntry(nsIURI* aURI, nsIPrincipal* aPrincipal,
bool aWithCredentials, bool aCreate);
void RemoveEntries(nsIURI* aURI, nsIPrincipal* aPrincipal);
void Clear();
private:
static PLDHashOperator
RemoveExpiredEntries(const nsACString& aKey, nsAutoPtr<CacheEntry>& aValue,
void* aUserData);
static bool GetCacheKey(nsIURI* aURI, nsIPrincipal* aPrincipal,
bool aWithCredentials, nsACString& _retval);
nsClassHashtable<nsCStringHashKey, CacheEntry> mTable;
LinkedList<CacheEntry> mList;
};
// Will be initialized in EnsurePreflightCache.
static nsPreflightCache* sPreflightCache = nullptr;
static bool EnsurePreflightCache()
{
if (sPreflightCache)
return true;
nsAutoPtr<nsPreflightCache> newCache(new nsPreflightCache());
if (newCache->Initialize()) {
sPreflightCache = newCache.forget();
return true;
}
return false;
}
void
nsPreflightCache::CacheEntry::PurgeExpired(TimeStamp now)
{
uint32_t i;
for (i = 0; i < mMethods.Length(); ++i) {
if (now >= mMethods[i].expirationTime) {
mMethods.RemoveElementAt(i--);
}
}
for (i = 0; i < mHeaders.Length(); ++i) {
if (now >= mHeaders[i].expirationTime) {
mHeaders.RemoveElementAt(i--);
}
}
}
bool
nsPreflightCache::CacheEntry::CheckRequest(const nsCString& aMethod,
const nsTArray<nsCString>& aHeaders)
{
PurgeExpired(TimeStamp::NowLoRes());
if (!aMethod.EqualsLiteral("GET") && !aMethod.EqualsLiteral("POST")) {
uint32_t i;
for (i = 0; i < mMethods.Length(); ++i) {
if (aMethod.Equals(mMethods[i].token))
break;
}
if (i == mMethods.Length()) {
return false;
}
}
for (uint32_t i = 0; i < aHeaders.Length(); ++i) {
uint32_t j;
for (j = 0; j < mHeaders.Length(); ++j) {
if (aHeaders[i].Equals(mHeaders[j].token,
nsCaseInsensitiveCStringComparator())) {
break;
}
}
if (j == mHeaders.Length()) {
return false;
}
}
return true;
}
nsPreflightCache::CacheEntry*
nsPreflightCache::GetEntry(nsIURI* aURI,
nsIPrincipal* aPrincipal,
bool aWithCredentials,
bool aCreate)
{
nsCString key;
if (!GetCacheKey(aURI, aPrincipal, aWithCredentials, key)) {
NS_WARNING("Invalid cache key!");
return nullptr;
}
CacheEntry* entry;
if (mTable.Get(key, &entry)) {
// Entry already existed so just return it. Also update the LRU list.
// Move to the head of the list.
entry->removeFrom(mList);
mList.insertFront(entry);
return entry;
}
if (!aCreate) {
return nullptr;
}
// This is a new entry, allocate and insert into the table now so that any
// failures don't cause items to be removed from a full cache.
entry = new CacheEntry(key);
if (!entry) {
NS_WARNING("Failed to allocate new cache entry!");
return nullptr;
}
NS_ASSERTION(mTable.Count() <= PREFLIGHT_CACHE_SIZE,
"Something is borked, too many entries in the cache!");
// Now enforce the max count.
if (mTable.Count() == PREFLIGHT_CACHE_SIZE) {
// Try to kick out all the expired entries.
TimeStamp now = TimeStamp::NowLoRes();
mTable.Enumerate(RemoveExpiredEntries, &now);
// If that didn't remove anything then kick out the least recently used
// entry.
if (mTable.Count() == PREFLIGHT_CACHE_SIZE) {
CacheEntry* lruEntry = static_cast<CacheEntry*>(mList.popLast());
MOZ_ASSERT(lruEntry);
// This will delete 'lruEntry'.
mTable.Remove(lruEntry->mKey);
NS_ASSERTION(mTable.Count() == PREFLIGHT_CACHE_SIZE - 1,
"Somehow tried to remove an entry that was never added!");
}
}
mTable.Put(key, entry);
mList.insertFront(entry);
return entry;
}
void
nsPreflightCache::RemoveEntries(nsIURI* aURI, nsIPrincipal* aPrincipal)
{
CacheEntry* entry;
nsCString key;
if (GetCacheKey(aURI, aPrincipal, true, key) &&
mTable.Get(key, &entry)) {
entry->removeFrom(mList);
mTable.Remove(key);
}
if (GetCacheKey(aURI, aPrincipal, false, key) &&
mTable.Get(key, &entry)) {
entry->removeFrom(mList);
mTable.Remove(key);
}
}
void
nsPreflightCache::Clear()
{
mList.clear();
mTable.Clear();
}
/* static */ PLDHashOperator
nsPreflightCache::RemoveExpiredEntries(const nsACString& aKey,
nsAutoPtr<CacheEntry>& aValue,
void* aUserData)
{
TimeStamp* now = static_cast<TimeStamp*>(aUserData);
aValue->PurgeExpired(*now);
if (aValue->mHeaders.IsEmpty() &&
aValue->mMethods.IsEmpty()) {
// Expired, remove from the list as well as the hash table.
aValue->removeFrom(sPreflightCache->mList);
return PL_DHASH_REMOVE;
}
return PL_DHASH_NEXT;
}
/* static */ bool
nsPreflightCache::GetCacheKey(nsIURI* aURI,
nsIPrincipal* aPrincipal,
bool aWithCredentials,
nsACString& _retval)
{
NS_ASSERTION(aURI, "Null uri!");
NS_ASSERTION(aPrincipal, "Null principal!");
NS_NAMED_LITERAL_CSTRING(space, " ");
nsCOMPtr<nsIURI> uri;
nsresult rv = aPrincipal->GetURI(getter_AddRefs(uri));
NS_ENSURE_SUCCESS(rv, false);
nsAutoCString scheme, host, port;
if (uri) {
uri->GetScheme(scheme);
uri->GetHost(host);
port.AppendInt(NS_GetRealPort(uri));
}
if (aWithCredentials) {
_retval.AssignLiteral("cred");
}
else {
_retval.AssignLiteral("nocred");
}
nsAutoCString spec;
rv = aURI->GetSpec(spec);
NS_ENSURE_SUCCESS(rv, false);
_retval.Append(space + scheme + space + host + space + port + space +
spec);
return true;
}
//////////////////////////////////////////////////////////////////////////
// nsCORSListenerProxy
NS_IMPL_ISUPPORTS(nsCORSListenerProxy, nsIStreamListener,
nsIRequestObserver, nsIChannelEventSink,
nsIInterfaceRequestor, nsIThreadRetargetableStreamListener)
/* static */
void
nsCORSListenerProxy::Startup()
{
Preferences::AddBoolVarCache(&gDisableCORS,
"content.cors.disable");
Preferences::AddBoolVarCache(&gDisableCORSPrivateData,
"content.cors.no_private_data");
}
/* static */
void
nsCORSListenerProxy::Shutdown()
{
delete sPreflightCache;
sPreflightCache = nullptr;
}
nsCORSListenerProxy::nsCORSListenerProxy(nsIStreamListener* aOuter,
nsIPrincipal* aRequestingPrincipal,
bool aWithCredentials)
: mOuterListener(aOuter),
mRequestingPrincipal(aRequestingPrincipal),
mOriginHeaderPrincipal(aRequestingPrincipal),
mWithCredentials(aWithCredentials && !gDisableCORSPrivateData),
mRequestApproved(false),
mHasBeenCrossSite(false)
{
}
nsCORSListenerProxy::~nsCORSListenerProxy()
{
}
nsresult
nsCORSListenerProxy::Init(nsIChannel* aChannel, DataURIHandling aAllowDataURI)
{
aChannel->GetNotificationCallbacks(getter_AddRefs(mOuterNotificationCallbacks));
aChannel->SetNotificationCallbacks(this);
nsresult rv = UpdateChannel(aChannel, aAllowDataURI, UpdateType::Default);
if (NS_FAILED(rv)) {
mOuterListener = nullptr;
mRequestingPrincipal = nullptr;
mOriginHeaderPrincipal = nullptr;
mOuterNotificationCallbacks = nullptr;
}
#ifdef DEBUG
mInited = true;
#endif
return rv;
}
NS_IMETHODIMP
nsCORSListenerProxy::OnStartRequest(nsIRequest* aRequest,
nsISupports* aContext)
{
MOZ_ASSERT(mInited, "nsCORSListenerProxy has not been initialized properly");
nsresult rv = CheckRequestApproved(aRequest);
mRequestApproved = NS_SUCCEEDED(rv);
if (!mRequestApproved) {
nsCOMPtr<nsIChannel> channel = do_QueryInterface(aRequest);
if (channel) {
nsCOMPtr<nsIURI> uri;
NS_GetFinalChannelURI(channel, getter_AddRefs(uri));
if (uri) {
if (sPreflightCache) {
// OK to use mRequestingPrincipal since preflights never get
// redirected.
sPreflightCache->RemoveEntries(uri, mRequestingPrincipal);
} else {
nsCOMPtr<nsIHttpChannelChild> httpChannelChild =
do_QueryInterface(channel);
if (httpChannelChild) {
rv = httpChannelChild->RemoveCorsPreflightCacheEntry(uri, mRequestingPrincipal);
if (NS_FAILED(rv)) {
// Only warn here to ensure we fall through the request Cancel()
// and outer listener OnStartRequest() calls.
NS_WARNING("Failed to remove CORS preflight cache entry!");
}
}
}
}
}
aRequest->Cancel(NS_ERROR_DOM_BAD_URI);
mOuterListener->OnStartRequest(aRequest, aContext);
return NS_ERROR_DOM_BAD_URI;
}
return mOuterListener->OnStartRequest(aRequest, aContext);
}
nsresult
nsCORSListenerProxy::CheckRequestApproved(nsIRequest* aRequest)
{
// Check if this was actually a cross domain request
if (!mHasBeenCrossSite) {
return NS_OK;
}
if (gDisableCORS) {
LogBlockedRequest(aRequest, "CORSDisabled", nullptr);
return NS_ERROR_DOM_BAD_URI;
}
// Check if the request failed
nsresult status;
nsresult rv = aRequest->GetStatus(&status);
NS_ENSURE_SUCCESS(rv, rv);
NS_ENSURE_SUCCESS(status, status);
// Test that things worked on a HTTP level
nsCOMPtr<nsIHttpChannel> http = do_QueryInterface(aRequest);
if (!http) {
LogBlockedRequest(aRequest, "CORSRequestNotHttp", nullptr);
return NS_ERROR_DOM_BAD_URI;
}
nsCOMPtr<nsIHttpChannelInternal> internal = do_QueryInterface(aRequest);
NS_ENSURE_STATE(internal);
bool responseSynthesized = false;
if (NS_SUCCEEDED(internal->GetResponseSynthesized(&responseSynthesized)) &&
responseSynthesized) {
// For synthesized responses, we don't need to perform any checks.
// Note: This would be unsafe if we ever changed our behavior to allow
// service workers to intercept CORS preflights.
return NS_OK;
}
// Check the Access-Control-Allow-Origin header
nsAutoCString allowedOriginHeader;
rv = http->GetResponseHeader(
NS_LITERAL_CSTRING("Access-Control-Allow-Origin"), allowedOriginHeader);
if (NS_FAILED(rv)) {
LogBlockedRequest(aRequest, "CORSMissingAllowOrigin", nullptr);
return rv;
}
if (mWithCredentials || !allowedOriginHeader.EqualsLiteral("*")) {
nsAutoCString origin;
nsContentUtils::GetASCIIOrigin(mOriginHeaderPrincipal, origin);
if (!allowedOriginHeader.Equals(origin)) {
LogBlockedRequest(aRequest, "CORSAllowOriginNotMatchingOrigin",
NS_ConvertUTF8toUTF16(allowedOriginHeader).get());
return NS_ERROR_DOM_BAD_URI;
}
}
// Check Access-Control-Allow-Credentials header
if (mWithCredentials) {
nsAutoCString allowCredentialsHeader;
rv = http->GetResponseHeader(
NS_LITERAL_CSTRING("Access-Control-Allow-Credentials"), allowCredentialsHeader);
if (!allowCredentialsHeader.EqualsLiteral("true")) {
LogBlockedRequest(aRequest, "CORSMissingAllowCredentials", nullptr);
return NS_ERROR_DOM_BAD_URI;
}
}
return NS_OK;
}
NS_IMETHODIMP
nsCORSListenerProxy::OnStopRequest(nsIRequest* aRequest,
nsISupports* aContext,
nsresult aStatusCode)
{
MOZ_ASSERT(mInited, "nsCORSListenerProxy has not been initialized properly");
nsresult rv = mOuterListener->OnStopRequest(aRequest, aContext, aStatusCode);
mOuterListener = nullptr;
mOuterNotificationCallbacks = nullptr;
return rv;
}
NS_IMETHODIMP
nsCORSListenerProxy::OnDataAvailable(nsIRequest* aRequest,
nsISupports* aContext,
nsIInputStream* aInputStream,
uint64_t aOffset,
uint32_t aCount)
{
// NB: This can be called on any thread! But we're guaranteed that it is
// called between OnStartRequest and OnStopRequest, so we don't need to worry
// about races.
MOZ_ASSERT(mInited, "nsCORSListenerProxy has not been initialized properly");
if (!mRequestApproved) {
return NS_ERROR_DOM_BAD_URI;
}
return mOuterListener->OnDataAvailable(aRequest, aContext, aInputStream,
aOffset, aCount);
}
void
nsCORSListenerProxy::SetInterceptController(nsINetworkInterceptController* aInterceptController)
{
mInterceptController = aInterceptController;
}
NS_IMETHODIMP
nsCORSListenerProxy::GetInterface(const nsIID & aIID, void **aResult)
{
if (aIID.Equals(NS_GET_IID(nsIChannelEventSink))) {
*aResult = static_cast<nsIChannelEventSink*>(this);
NS_ADDREF_THIS();
return NS_OK;
}
if (aIID.Equals(NS_GET_IID(nsINetworkInterceptController)) &&
mInterceptController) {
nsCOMPtr<nsINetworkInterceptController> copy(mInterceptController);
*aResult = copy.forget().take();
return NS_OK;
}
return mOuterNotificationCallbacks ?
mOuterNotificationCallbacks->GetInterface(aIID, aResult) :
NS_ERROR_NO_INTERFACE;
}
NS_IMETHODIMP
nsCORSListenerProxy::AsyncOnChannelRedirect(nsIChannel *aOldChannel,
nsIChannel *aNewChannel,
uint32_t aFlags,
nsIAsyncVerifyRedirectCallback *aCb)
{
nsresult rv;
if (NS_IsInternalSameURIRedirect(aOldChannel, aNewChannel, aFlags) ||
NS_IsHSTSUpgradeRedirect(aOldChannel, aNewChannel, aFlags)) {
// Internal redirects still need to be updated in order to maintain
// the correct headers. We use DataURIHandling::Allow, since unallowed
// data URIs should have been blocked before we got to the internal
// redirect.
rv = UpdateChannel(aNewChannel, DataURIHandling::Allow,
UpdateType::InternalOrHSTSRedirect);
if (NS_FAILED(rv)) {
NS_WARNING("nsCORSListenerProxy::AsyncOnChannelRedirect: "
"internal redirect UpdateChannel() returned failure");
aOldChannel->Cancel(rv);
return rv;
}
} else {
// A real, external redirect. Perform CORS checking on new URL.
rv = CheckRequestApproved(aOldChannel);
if (NS_FAILED(rv)) {
nsCOMPtr<nsIURI> oldURI;
NS_GetFinalChannelURI(aOldChannel, getter_AddRefs(oldURI));
if (oldURI) {
if (sPreflightCache) {
// OK to use mRequestingPrincipal since preflights never get
// redirected.
sPreflightCache->RemoveEntries(oldURI, mRequestingPrincipal);
} else {
nsCOMPtr<nsIHttpChannelChild> httpChannelChild =
do_QueryInterface(aOldChannel);
if (httpChannelChild) {
rv = httpChannelChild->RemoveCorsPreflightCacheEntry(oldURI, mRequestingPrincipal);
if (NS_FAILED(rv)) {
// Only warn here to ensure we call the channel Cancel() below
NS_WARNING("Failed to remove CORS preflight cache entry!");
}
}
}
}
aOldChannel->Cancel(NS_ERROR_DOM_BAD_URI);
return NS_ERROR_DOM_BAD_URI;
}
if (mHasBeenCrossSite) {
// Once we've been cross-site, cross-origin redirects reset our source
// origin. Note that we need to call GetChannelURIPrincipal() because
// we are looking for the principal that is actually being loaded and not
// the principal that initiated the load.
nsCOMPtr<nsIPrincipal> oldChannelPrincipal;
nsContentUtils::GetSecurityManager()->
GetChannelURIPrincipal(aOldChannel, getter_AddRefs(oldChannelPrincipal));
nsCOMPtr<nsIPrincipal> newChannelPrincipal;
nsContentUtils::GetSecurityManager()->
GetChannelURIPrincipal(aNewChannel, getter_AddRefs(newChannelPrincipal));
if (!oldChannelPrincipal || !newChannelPrincipal) {
rv = NS_ERROR_OUT_OF_MEMORY;
}
if (NS_SUCCEEDED(rv)) {
bool equal;
rv = oldChannelPrincipal->Equals(newChannelPrincipal, &equal);
if (NS_SUCCEEDED(rv)) {
if (!equal) {
// Spec says to set our source origin to a unique origin.
mOriginHeaderPrincipal = nsNullPrincipal::Create();
if (!mOriginHeaderPrincipal) {
rv = NS_ERROR_OUT_OF_MEMORY;
}
}
}
}
if (NS_FAILED(rv)) {
aOldChannel->Cancel(rv);
return rv;
}
}
rv = UpdateChannel(aNewChannel, DataURIHandling::Disallow,
UpdateType::Default);
if (NS_FAILED(rv)) {
NS_WARNING("nsCORSListenerProxy::AsyncOnChannelRedirect: "
"UpdateChannel() returned failure");
aOldChannel->Cancel(rv);
return rv;
}
}
nsCOMPtr<nsIChannelEventSink> outer =
do_GetInterface(mOuterNotificationCallbacks);
if (outer) {
return outer->AsyncOnChannelRedirect(aOldChannel, aNewChannel, aFlags, aCb);
}
aCb->OnRedirectVerifyCallback(NS_OK);
return NS_OK;
}
NS_IMETHODIMP
nsCORSListenerProxy::CheckListenerChain()
{
MOZ_ASSERT(NS_IsMainThread());
if (nsCOMPtr<nsIThreadRetargetableStreamListener> retargetableListener =
do_QueryInterface(mOuterListener)) {
return retargetableListener->CheckListenerChain();
}
return NS_ERROR_NO_INTERFACE;
}
// Please note that the CSP directive 'upgrade-insecure-requests' relies
// on the promise that channels get updated from http: to https: before
// the channel fetches any data from the netwerk. Such channels should
// not be blocked by CORS and marked as cross origin requests. E.g.:
// toplevel page: https://www.example.com loads
// xhr: http://www.example.com/foo which gets updated to
// https://www.example.com/foo
// In such a case we should bail out of CORS and rely on the promise that
// nsHttpChannel::Connect() upgrades the request from http to https.
bool
CheckUpgradeInsecureRequestsPreventsCORS(nsIPrincipal* aRequestingPrincipal,
nsIChannel* aChannel)
{
nsCOMPtr<nsIURI> channelURI;
nsresult rv = NS_GetFinalChannelURI(aChannel, getter_AddRefs(channelURI));
NS_ENSURE_SUCCESS(rv, false);
bool isHttpScheme = false;
rv = channelURI->SchemeIs("http", &isHttpScheme);
NS_ENSURE_SUCCESS(rv, false);
// upgrade insecure requests is only applicable to http requests
if (!isHttpScheme) {
return false;
}
nsCOMPtr<nsIURI> principalURI;
rv = aRequestingPrincipal->GetURI(getter_AddRefs(principalURI));
NS_ENSURE_SUCCESS(rv, false);
// if the requestingPrincipal does not have a uri, there is nothing to do
if (!principalURI) {
return false;
}
nsCOMPtr<nsIURI>originalURI;
rv = aChannel->GetOriginalURI(getter_AddRefs(originalURI));
NS_ENSURE_SUCCESS(rv, false);
nsAutoCString principalHost, channelHost, origChannelHost;
// if we can not query a host from the uri, there is nothing to do
if (NS_FAILED(principalURI->GetAsciiHost(principalHost)) ||
NS_FAILED(channelURI->GetAsciiHost(channelHost)) ||
NS_FAILED(originalURI->GetAsciiHost(origChannelHost))) {
return false;
}
// if the hosts do not match, there is nothing to do
if (!principalHost.EqualsIgnoreCase(channelHost.get())) {
return false;
}
// also check that uri matches the one of the originalURI
if (!channelHost.EqualsIgnoreCase(origChannelHost.get())) {
return false;
}
nsCOMPtr<nsILoadInfo> loadInfo;
rv = aChannel->GetLoadInfo(getter_AddRefs(loadInfo));
NS_ENSURE_SUCCESS(rv, false);
// lets see if the loadInfo indicates that the request will
// be upgraded before fetching any data from the netwerk.
return loadInfo->GetUpgradeInsecureRequests();
}
nsresult
nsCORSListenerProxy::UpdateChannel(nsIChannel* aChannel,
DataURIHandling aAllowDataURI,
UpdateType aUpdateType)
{
nsCOMPtr<nsIURI> uri, originalURI;
nsresult rv = NS_GetFinalChannelURI(aChannel, getter_AddRefs(uri));
NS_ENSURE_SUCCESS(rv, rv);
rv = aChannel->GetOriginalURI(getter_AddRefs(originalURI));
NS_ENSURE_SUCCESS(rv, rv);
nsCOMPtr<nsILoadInfo> loadInfo = aChannel->GetLoadInfo();
// exempt data URIs from the same origin check.
if (aAllowDataURI == DataURIHandling::Allow && originalURI == uri) {
bool dataScheme = false;
rv = uri->SchemeIs("data", &dataScheme);
NS_ENSURE_SUCCESS(rv, rv);
if (dataScheme) {
return NS_OK;
}
if (loadInfo && loadInfo->GetAboutBlankInherits() &&
NS_IsAboutBlank(uri)) {
return NS_OK;
}
}
// Set CORS attributes on channel so that intercepted requests get correct
// values. We have to do this here because the CheckMayLoad checks may lead
// to early return. We can't be sure this is an http channel though, so we
// can't return early on failure.
nsCOMPtr<nsIHttpChannelInternal> internal = do_QueryInterface(aChannel);
if (internal) {
rv = internal->SetCorsMode(nsIHttpChannelInternal::CORS_MODE_CORS);
NS_ENSURE_SUCCESS(rv, rv);
rv = internal->SetCorsIncludeCredentials(mWithCredentials);
NS_ENSURE_SUCCESS(rv, rv);
}
// Check that the uri is ok to load
rv = nsContentUtils::GetSecurityManager()->
CheckLoadURIWithPrincipal(mRequestingPrincipal, uri,
nsIScriptSecurityManager::STANDARD);
NS_ENSURE_SUCCESS(rv, rv);
if (originalURI != uri) {
rv = nsContentUtils::GetSecurityManager()->
CheckLoadURIWithPrincipal(mRequestingPrincipal, originalURI,
nsIScriptSecurityManager::STANDARD);
NS_ENSURE_SUCCESS(rv, rv);
}
if (!mHasBeenCrossSite &&
NS_SUCCEEDED(mRequestingPrincipal->CheckMayLoad(uri, false, false)) &&
(originalURI == uri ||
NS_SUCCEEDED(mRequestingPrincipal->CheckMayLoad(originalURI,
false, false)))) {
return NS_OK;
}
// if the CSP directive 'upgrade-insecure-requests' is used then we should
// not incorrectly require CORS if the only difference of a subresource
// request and the main page is the scheme.
// e.g. toplevel page: https://www.example.com loads
// xhr: http://www.example.com/somefoo,
// then the xhr request will be upgraded to https before it fetches any data
// from the netwerk, hence we shouldn't require CORS in that specific case.
if (CheckUpgradeInsecureRequestsPreventsCORS(mRequestingPrincipal, aChannel)) {
return NS_OK;
}
// Check if we need to do a preflight, and if so set one up. This must be
// called once we know that the request is going, or has gone, cross-origin.
rv = CheckPreflightNeeded(aChannel, aUpdateType);
NS_ENSURE_SUCCESS(rv, rv);
// It's a cross site load
mHasBeenCrossSite = true;
nsCString userpass;
uri->GetUserPass(userpass);
NS_ENSURE_TRUE(userpass.IsEmpty(), NS_ERROR_DOM_BAD_URI);
// Add the Origin header
nsAutoCString origin;
rv = nsContentUtils::GetASCIIOrigin(mOriginHeaderPrincipal, origin);
NS_ENSURE_SUCCESS(rv, rv);
nsCOMPtr<nsIHttpChannel> http = do_QueryInterface(aChannel);
NS_ENSURE_TRUE(http, NS_ERROR_FAILURE);
rv = http->SetRequestHeader(NS_LITERAL_CSTRING("Origin"), origin, false);
NS_ENSURE_SUCCESS(rv, rv);
// Make cookie-less if needed. We don't need to do anything here if the
// channel was opened with AsyncOpen2, since then AsyncOpen2 will take
// care of the cookie policy for us.
if (!mWithCredentials &&
(!loadInfo || !loadInfo->GetEnforceSecurity())) {
nsLoadFlags flags;
rv = http->GetLoadFlags(&flags);
NS_ENSURE_SUCCESS(rv, rv);
flags |= nsIRequest::LOAD_ANONYMOUS;
rv = http->SetLoadFlags(flags);
NS_ENSURE_SUCCESS(rv, rv);
}
return NS_OK;
}
nsresult
nsCORSListenerProxy::CheckPreflightNeeded(nsIChannel* aChannel, UpdateType aUpdateType)
{
// If this caller isn't using AsyncOpen2, or if this *is* a preflight channel,
// then we shouldn't initiate preflight for this channel.
nsCOMPtr<nsILoadInfo> loadInfo = aChannel->GetLoadInfo();
if (!loadInfo ||
loadInfo->GetSecurityMode() !=
nsILoadInfo::SEC_REQUIRE_CORS_DATA_INHERITS ||
loadInfo->GetIsPreflight()) {
return NS_OK;
}
bool doPreflight = loadInfo->GetForcePreflight();
nsCOMPtr<nsIHttpChannel> http = do_QueryInterface(aChannel);
NS_ENSURE_TRUE(http, NS_ERROR_DOM_BAD_URI);
nsAutoCString method;
http->GetRequestMethod(method);
if (!method.LowerCaseEqualsLiteral("get") &&
!method.LowerCaseEqualsLiteral("post") &&
!method.LowerCaseEqualsLiteral("head")) {
doPreflight = true;
}
// Avoid copying the array here
const nsTArray<nsCString>& loadInfoHeaders = loadInfo->CorsUnsafeHeaders();
if (!loadInfoHeaders.IsEmpty()) {
doPreflight = true;
}
// Add Content-Type header if needed
nsTArray<nsCString> headers;
nsAutoCString contentTypeHeader;
nsresult rv = http->GetRequestHeader(NS_LITERAL_CSTRING("Content-Type"),
contentTypeHeader);
// GetRequestHeader return an error if the header is not set. Don't add
// "content-type" to the list if that's the case.
if (NS_SUCCEEDED(rv) &&
!nsContentUtils::IsAllowedNonCorsContentType(contentTypeHeader) &&
!loadInfoHeaders.Contains(NS_LITERAL_CSTRING("content-type"),
nsCaseInsensitiveCStringArrayComparator())) {
headers.AppendElements(loadInfoHeaders);
headers.AppendElement(NS_LITERAL_CSTRING("content-type"));
doPreflight = true;
}
if (!doPreflight) {
return NS_OK;
}
// A preflight is needed. But if we've already been cross-site, then
// we already did a preflight when that happened, and so we're not allowed
// to do another preflight again.
if (aUpdateType != UpdateType::InternalOrHSTSRedirect) {
NS_ENSURE_FALSE(mHasBeenCrossSite, NS_ERROR_DOM_BAD_URI);
}
nsCOMPtr<nsIHttpChannelInternal> internal = do_QueryInterface(http);
NS_ENSURE_TRUE(internal, NS_ERROR_DOM_BAD_URI);
internal->SetCorsPreflightParameters(
headers.IsEmpty() ? loadInfoHeaders : headers);
return NS_OK;
}
//////////////////////////////////////////////////////////////////////////
// Preflight proxy
// Class used as streamlistener and notification callback when
// doing the initial OPTIONS request for a CORS check
class nsCORSPreflightListener final : public nsIStreamListener,
public nsIInterfaceRequestor,
public nsIChannelEventSink
{
public:
nsCORSPreflightListener(nsIPrincipal* aReferrerPrincipal,
nsICorsPreflightCallback* aCallback,
bool aWithCredentials,
const nsCString& aPreflightMethod,
const nsTArray<nsCString>& aPreflightHeaders)
: mPreflightMethod(aPreflightMethod),
mPreflightHeaders(aPreflightHeaders),
mReferrerPrincipal(aReferrerPrincipal),
mCallback(aCallback),
mWithCredentials(aWithCredentials)
{
}
NS_DECL_ISUPPORTS
NS_DECL_NSISTREAMLISTENER
NS_DECL_NSIREQUESTOBSERVER
NS_DECL_NSIINTERFACEREQUESTOR
NS_DECL_NSICHANNELEVENTSINK
nsresult CheckPreflightRequestApproved(nsIRequest* aRequest);
private:
~nsCORSPreflightListener() {}
void AddResultToCache(nsIRequest* aRequest);
nsCString mPreflightMethod;
nsTArray<nsCString> mPreflightHeaders;
nsCOMPtr<nsIPrincipal> mReferrerPrincipal;
nsCOMPtr<nsICorsPreflightCallback> mCallback;
bool mWithCredentials;
};
NS_IMPL_ISUPPORTS(nsCORSPreflightListener, nsIStreamListener,
nsIRequestObserver, nsIInterfaceRequestor,
nsIChannelEventSink)
void
nsCORSPreflightListener::AddResultToCache(nsIRequest *aRequest)
{
nsCOMPtr<nsIHttpChannel> http = do_QueryInterface(aRequest);
NS_ASSERTION(http, "Request was not http");
// The "Access-Control-Max-Age" header should return an age in seconds.
nsAutoCString headerVal;
http->GetResponseHeader(NS_LITERAL_CSTRING("Access-Control-Max-Age"),
headerVal);
if (headerVal.IsEmpty()) {
return;
}
// Sanitize the string. We only allow 'delta-seconds' as specified by
// http://dev.w3.org/2006/waf/access-control (digits 0-9 with no leading or
// trailing non-whitespace characters).
uint32_t age = 0;
nsCSubstring::const_char_iterator iter, end;
headerVal.BeginReading(iter);
headerVal.EndReading(end);
while (iter != end) {
if (*iter < '0' || *iter > '9') {
return;
}
age = age * 10 + (*iter - '0');
// Cap at 24 hours. This also avoids overflow
age = std::min(age, 86400U);
++iter;
}
if (!age || !EnsurePreflightCache()) {
return;
}
// String seems fine, go ahead and cache.
// Note that we have already checked that these headers follow the correct
// syntax.
nsCOMPtr<nsIURI> uri;
NS_GetFinalChannelURI(http, getter_AddRefs(uri));
TimeStamp expirationTime = TimeStamp::NowLoRes() + TimeDuration::FromSeconds(age);
nsPreflightCache::CacheEntry* entry =
sPreflightCache->GetEntry(uri, mReferrerPrincipal, mWithCredentials,
true);
if (!entry) {
return;
}
// The "Access-Control-Allow-Methods" header contains a comma separated
// list of method names.
http->GetResponseHeader(NS_LITERAL_CSTRING("Access-Control-Allow-Methods"),
headerVal);
nsCCharSeparatedTokenizer methods(headerVal, ',');
while(methods.hasMoreTokens()) {
const nsDependentCSubstring& method = methods.nextToken();
if (method.IsEmpty()) {
continue;
}
uint32_t i;
for (i = 0; i < entry->mMethods.Length(); ++i) {
if (entry->mMethods[i].token.Equals(method)) {
entry->mMethods[i].expirationTime = expirationTime;
break;
}
}
if (i == entry->mMethods.Length()) {
nsPreflightCache::TokenTime* newMethod =
entry->mMethods.AppendElement();
if (!newMethod) {
return;
}
newMethod->token = method;
newMethod->expirationTime = expirationTime;
}
}
// The "Access-Control-Allow-Headers" header contains a comma separated
// list of method names.
http->GetResponseHeader(NS_LITERAL_CSTRING("Access-Control-Allow-Headers"),
headerVal);
nsCCharSeparatedTokenizer headers(headerVal, ',');
while(headers.hasMoreTokens()) {
const nsDependentCSubstring& header = headers.nextToken();
if (header.IsEmpty()) {
continue;
}
uint32_t i;
for (i = 0; i < entry->mHeaders.Length(); ++i) {
if (entry->mHeaders[i].token.Equals(header)) {
entry->mHeaders[i].expirationTime = expirationTime;
break;
}
}
if (i == entry->mHeaders.Length()) {
nsPreflightCache::TokenTime* newHeader =
entry->mHeaders.AppendElement();
if (!newHeader) {
return;
}
newHeader->token = header;
newHeader->expirationTime = expirationTime;
}
}
}
NS_IMETHODIMP
nsCORSPreflightListener::OnStartRequest(nsIRequest *aRequest,
nsISupports *aContext)
{
#ifdef DEBUG
{
nsCOMPtr<nsIHttpChannelInternal> internal = do_QueryInterface(aRequest);
bool responseSynthesized = false;
if (internal &&
NS_SUCCEEDED(internal->GetResponseSynthesized(&responseSynthesized))) {
// For synthesized responses, we don't need to perform any checks.
// This would be unsafe if we ever changed our behavior to allow
// service workers to intercept CORS preflights.
MOZ_ASSERT(!responseSynthesized);
}
}
#endif
nsresult rv = CheckPreflightRequestApproved(aRequest);
if (NS_SUCCEEDED(rv)) {
// Everything worked, try to cache and then fire off the actual request.
AddResultToCache(aRequest);
mCallback->OnPreflightSucceeded();
} else {
mCallback->OnPreflightFailed(rv);
}
return rv;
}
NS_IMETHODIMP
nsCORSPreflightListener::OnStopRequest(nsIRequest *aRequest,
nsISupports *aContext,
nsresult aStatus)
{
mCallback = nullptr;
return NS_OK;
}
/** nsIStreamListener methods **/
NS_IMETHODIMP
nsCORSPreflightListener::OnDataAvailable(nsIRequest *aRequest,
nsISupports *ctxt,
nsIInputStream *inStr,
uint64_t sourceOffset,
uint32_t count)
{
uint32_t totalRead;
return inStr->ReadSegments(NS_DiscardSegment, nullptr, count, &totalRead);
}
NS_IMETHODIMP
nsCORSPreflightListener::AsyncOnChannelRedirect(nsIChannel *aOldChannel,
nsIChannel *aNewChannel,
uint32_t aFlags,
nsIAsyncVerifyRedirectCallback *callback)
{
// Only internal redirects allowed for now.
if (!NS_IsInternalSameURIRedirect(aOldChannel, aNewChannel, aFlags) &&
!NS_IsHSTSUpgradeRedirect(aOldChannel, aNewChannel, aFlags))
return NS_ERROR_DOM_BAD_URI;
callback->OnRedirectVerifyCallback(NS_OK);
return NS_OK;
}
nsresult
nsCORSPreflightListener::CheckPreflightRequestApproved(nsIRequest* aRequest)
{
nsresult status;
nsresult rv = aRequest->GetStatus(&status);
NS_ENSURE_SUCCESS(rv, rv);
NS_ENSURE_SUCCESS(status, status);
// Test that things worked on a HTTP level
nsCOMPtr<nsIHttpChannel> http = do_QueryInterface(aRequest);
nsCOMPtr<nsIHttpChannelInternal> internal = do_QueryInterface(aRequest);
NS_ENSURE_STATE(internal);
bool succeedded;
rv = http->GetRequestSucceeded(&succeedded);
if (NS_FAILED(rv) || !succeedded) {
LogBlockedRequest(aRequest, "CORSPreflightDidNotSucceed", nullptr);
return NS_ERROR_DOM_BAD_URI;
}
nsAutoCString headerVal;
// The "Access-Control-Allow-Methods" header contains a comma separated
// list of method names.
http->GetResponseHeader(NS_LITERAL_CSTRING("Access-Control-Allow-Methods"),
headerVal);
bool foundMethod = mPreflightMethod.EqualsLiteral("GET") ||
mPreflightMethod.EqualsLiteral("HEAD") ||
mPreflightMethod.EqualsLiteral("POST");
nsCCharSeparatedTokenizer methodTokens(headerVal, ',');
while(methodTokens.hasMoreTokens()) {
const nsDependentCSubstring& method = methodTokens.nextToken();
if (method.IsEmpty()) {
continue;
}
if (!NS_IsValidHTTPToken(method)) {
LogBlockedRequest(aRequest, "CORSInvalidAllowMethod",
NS_ConvertUTF8toUTF16(method).get());
return NS_ERROR_DOM_BAD_URI;
}
if (method.EqualsLiteral("*") && !mWithCredentials) {
foundMethod = true;
} else {
foundMethod |= mPreflightMethod.Equals(method);
}
}
if (!foundMethod) {
LogBlockedRequest(aRequest, "CORSMethodNotFound", nullptr);
return NS_ERROR_DOM_BAD_URI;
}
// The "Access-Control-Allow-Headers" header contains a comma separated
// list of header names.
http->GetResponseHeader(NS_LITERAL_CSTRING("Access-Control-Allow-Headers"),
headerVal);
nsTArray<nsCString> headers;
nsCCharSeparatedTokenizer headerTokens(headerVal, ',');
while(headerTokens.hasMoreTokens()) {
const nsDependentCSubstring& header = headerTokens.nextToken();
if (header.IsEmpty()) {
continue;
}
if (!NS_IsValidHTTPToken(header)) {
LogBlockedRequest(aRequest, "CORSInvalidAllowHeader",
NS_ConvertUTF8toUTF16(header).get());
return NS_ERROR_DOM_BAD_URI;
}
headers.AppendElement(header);
}
for (uint32_t i = 0; i < mPreflightHeaders.Length(); ++i) {
if (!headers.Contains(mPreflightHeaders[i],
nsCaseInsensitiveCStringArrayComparator())) {
LogBlockedRequest(aRequest, "CORSMissingAllowHeaderFromPreflight",
NS_ConvertUTF8toUTF16(mPreflightHeaders[i]).get());
return NS_ERROR_DOM_BAD_URI;
}
}
return NS_OK;
}
NS_IMETHODIMP
nsCORSPreflightListener::GetInterface(const nsIID & aIID, void **aResult)
{
return QueryInterface(aIID, aResult);
}
void
nsCORSListenerProxy::RemoveFromCorsPreflightCache(nsIURI* aURI,
nsIPrincipal* aRequestingPrincipal)
{
MOZ_ASSERT(XRE_IsParentProcess());
if (sPreflightCache) {
sPreflightCache->RemoveEntries(aURI, aRequestingPrincipal);
}
}
nsresult
nsCORSListenerProxy::StartCORSPreflight(nsIChannel* aRequestChannel,
nsICorsPreflightCallback* aCallback,
nsTArray<nsCString>& aUnsafeHeaders,
nsIChannel** aPreflightChannel)
{
*aPreflightChannel = nullptr;
if (gDisableCORS) {
LogBlockedRequest(aRequestChannel, "CORSDisabled", nullptr);
return NS_ERROR_DOM_BAD_URI;
}
nsAutoCString method;
nsCOMPtr<nsIHttpChannel> httpChannel(do_QueryInterface(aRequestChannel));
NS_ENSURE_TRUE(httpChannel, NS_ERROR_UNEXPECTED);
httpChannel->GetRequestMethod(method);
nsCOMPtr<nsIURI> uri;
nsresult rv = NS_GetFinalChannelURI(aRequestChannel, getter_AddRefs(uri));
NS_ENSURE_SUCCESS(rv, rv);
nsCOMPtr<nsILoadInfo> originalLoadInfo = aRequestChannel->GetLoadInfo();
MOZ_ASSERT(originalLoadInfo, "can not perform CORS preflight without a loadInfo");
if (!originalLoadInfo) {
return NS_ERROR_FAILURE;
}
MOZ_ASSERT(originalLoadInfo->GetSecurityMode() ==
nsILoadInfo::SEC_REQUIRE_CORS_DATA_INHERITS,
"how did we end up here?");
nsCOMPtr<nsIPrincipal> principal = originalLoadInfo->LoadingPrincipal();
bool withCredentials = originalLoadInfo->GetCookiePolicy() ==
nsILoadInfo::SEC_COOKIES_INCLUDE;
nsPreflightCache::CacheEntry* entry =
sPreflightCache ?
sPreflightCache->GetEntry(uri, principal, withCredentials, false) :
nullptr;
if (entry && entry->CheckRequest(method, aUnsafeHeaders)) {
aCallback->OnPreflightSucceeded();
return NS_OK;
}
// Either it wasn't cached or the cached result has expired. Build a
// channel for the OPTIONS request.
nsCOMPtr<nsILoadInfo> loadInfo = static_cast<mozilla::LoadInfo*>
(originalLoadInfo.get())->CloneForNewRequest();
static_cast<mozilla::LoadInfo*>(loadInfo.get())->SetIsPreflight();
nsCOMPtr<nsILoadGroup> loadGroup;
rv = aRequestChannel->GetLoadGroup(getter_AddRefs(loadGroup));
NS_ENSURE_SUCCESS(rv, rv);
nsLoadFlags loadFlags;
rv = aRequestChannel->GetLoadFlags(&loadFlags);
NS_ENSURE_SUCCESS(rv, rv);
// Preflight requests should never be intercepted by service workers and
// are always anonymous.
// NOTE: We ignore CORS checks on synthesized responses (see the CORS
// preflights, then we need to extend the GetResponseSynthesized() check in
// nsCORSListenerProxy::CheckRequestApproved()). If we change our behavior
// here and allow service workers to intercept CORS preflights, then that
// check won't be safe any more.
loadFlags |= nsIChannel::LOAD_BYPASS_SERVICE_WORKER |
nsIRequest::LOAD_ANONYMOUS;
nsCOMPtr<nsIChannel> preflightChannel;
rv = NS_NewChannelInternal(getter_AddRefs(preflightChannel),
uri,
loadInfo,
loadGroup,
nullptr, // aCallbacks
loadFlags);
NS_ENSURE_SUCCESS(rv, rv);
// Set method and headers
nsCOMPtr<nsIHttpChannel> preHttp = do_QueryInterface(preflightChannel);
NS_ASSERTION(preHttp, "Failed to QI to nsIHttpChannel!");
rv = preHttp->SetRequestMethod(NS_LITERAL_CSTRING("OPTIONS"));
NS_ENSURE_SUCCESS(rv, rv);
rv = preHttp->
SetRequestHeader(NS_LITERAL_CSTRING("Access-Control-Request-Method"),
method, false);
NS_ENSURE_SUCCESS(rv, rv);
nsTArray<nsCString> preflightHeaders;
if (!aUnsafeHeaders.IsEmpty()) {
for (uint32_t i = 0; i < aUnsafeHeaders.Length(); ++i) {
preflightHeaders.AppendElement();
ToLowerCase(aUnsafeHeaders[i], preflightHeaders[i]);
}
preflightHeaders.Sort();
nsAutoCString headers;
for (uint32_t i = 0; i < preflightHeaders.Length(); ++i) {
if (i != 0) {
headers += ',';
}
headers += preflightHeaders[i];
}
rv = preHttp->
SetRequestHeader(NS_LITERAL_CSTRING("Access-Control-Request-Headers"),
headers, false);
NS_ENSURE_SUCCESS(rv, rv);
}
// Set up listener which will start the original channel
RefPtr<nsCORSPreflightListener> preflightListener =
new nsCORSPreflightListener(principal, aCallback, withCredentials,
method, preflightHeaders);
rv = preflightChannel->SetNotificationCallbacks(preflightListener);
NS_ENSURE_SUCCESS(rv, rv);
// Start preflight
rv = preflightChannel->AsyncOpen2(preflightListener);
NS_ENSURE_SUCCESS(rv, rv);
// Return newly created preflight channel
preflightChannel.forget(aPreflightChannel);
return NS_OK;
}
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