/
nsCORSListenerProxy.cpp
1568 lines (1341 loc) · 49.7 KB
/
nsCORSListenerProxy.cpp
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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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 "nsQueryObject.h"
#include "nsIChannel.h"
#include "nsIHttpChannel.h"
#include "HttpChannelChild.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 "nsISupportsImpl.h"
#include "mozilla/LoadInfo.h"
#include "nsIHttpHeaderVisitor.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) {
spec = aUri->GetSpecOrDefault();
}
// 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 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* existingEntry = nullptr;
if (mTable.Get(key, &existingEntry)) {
// Entry already existed so just return it. Also update the LRU list.
// Move to the head of the list.
existingEntry->removeFrom(mList);
mList.insertFront(existingEntry);
return existingEntry;
}
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.
CacheEntry* newEntry = new CacheEntry(key);
if (!newEntry) {
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();
for (auto iter = mTable.Iter(); !iter.Done(); iter.Next()) {
nsAutoPtr<CacheEntry>& entry = iter.Data();
entry->PurgeExpired(now);
if (entry->mHeaders.IsEmpty() &&
entry->mMethods.IsEmpty()) {
// Expired, remove from the list as well as the hash table.
entry->removeFrom(sPreflightCache->mList);
iter.Remove();
}
}
// 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, newEntry);
mList.insertFront(newEntry);
return newEntry;
}
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 */ 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);
}
namespace {
class CheckOriginHeader final : public nsIHttpHeaderVisitor {
public:
NS_DECL_ISUPPORTS
CheckOriginHeader()
: mHeaderCount(0)
{}
NS_IMETHOD
VisitHeader(const nsACString & aHeader, const nsACString & aValue) override
{
if (aHeader.EqualsLiteral("Access-Control-Allow-Origin")) {
mHeaderCount++;
}
if (mHeaderCount > 1) {
return NS_ERROR_DOM_BAD_URI;
}
return NS_OK;
}
private:
uint32_t mHeaderCount;
~CheckOriginHeader()
{}
};
NS_IMPL_ISUPPORTS(CheckOriginHeader, nsIHttpHeaderVisitor)
}
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
RefPtr<CheckOriginHeader> visitor = new CheckOriginHeader();
nsAutoCString allowedOriginHeader;
// check for duplicate headers
rv = http->VisitOriginalResponseHeaders(visitor);
if (NS_FAILED(rv)) {
LogBlockedRequest(aRequest, "CORSMultipleAllowOriginNotAllowed", nullptr);
return rv;
}
rv = http->GetResponseHeader(
NS_LITERAL_CSTRING("Access-Control-Allow-Origin"), allowedOriginHeader);
if (NS_FAILED(rv)) {
LogBlockedRequest(aRequest, "CORSMissingAllowOrigin", nullptr);
return rv;
}
// Bug 1210985 - Explicitly point out the error that the credential is
// not supported if the allowing origin is '*'. Note that this check
// has to be done before the condition
//
// >> if (mWithCredentials || !allowedOriginHeader.EqualsLiteral("*"))
//
// below since "if (A && B)" is included in "if (A || !B)".
//
if (mWithCredentials && allowedOriginHeader.EqualsLiteral("*")) {
LogBlockedRequest(aRequest, "CORSNotSupportingCredentials", nullptr);
return NS_ERROR_DOM_BAD_URI;
}
if (mWithCredentials || !allowedOriginHeader.EqualsLiteral("*")) {
MOZ_ASSERT(!nsContentUtils::IsExpandedPrincipal(mOriginHeaderPrincipal));
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) && !equal) {
// Spec says to set our source origin to a unique origin.
mOriginHeaderPrincipal =
nsNullPrincipal::CreateWithInheritedAttributes(oldChannelPrincipal);
}
}
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);
}
// TODO: Bug 1353683
// consider calling SetBlockedRequest in nsCORSListenerProxy::UpdateChannel
//
// 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);
// If we have an expanded principal here, we'll reject the CORS request,
// because we can't send a useful Origin header which is required for CORS.
if (nsContentUtils::IsExpandedPrincipal(mOriginHeaderPrincipal)) {
return 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 ||