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gecko-dev/netwerk/base/nsChannelClassifier.cpp

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set sw=2 sts=2 ts=8 et 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 "nsChannelClassifier.h"
#include "mozIThirdPartyUtil.h"
#include "nsCharSeparatedTokenizer.h"
#include "nsContentUtils.h"
#include "nsIAddonPolicyService.h"
#include "nsICacheEntry.h"
#include "nsICachingChannel.h"
#include "nsIChannel.h"
#include "nsIClassOfService.h"
#include "nsIDocShell.h"
#include "nsIDocument.h"
#include "nsIDOMDocument.h"
#include "nsIHttpChannel.h"
#include "nsIHttpChannelInternal.h"
#include "nsIIOService.h"
#include "nsIParentChannel.h"
#include "nsIPermissionManager.h"
#include "nsIPrivateBrowsingTrackingProtectionWhitelist.h"
#include "nsIProtocolHandler.h"
#include "nsIScriptError.h"
#include "nsIScriptSecurityManager.h"
#include "nsISecureBrowserUI.h"
#include "nsISecurityEventSink.h"
#include "nsISupportsPriority.h"
#include "nsIURL.h"
#include "nsIWebProgressListener.h"
#include "nsNetUtil.h"
#include "nsPIDOMWindow.h"
#include "nsXULAppAPI.h"
#include "nsQueryObject.h"
#include "nsIUrlClassifierDBService.h"
#include "nsIURLFormatter.h"
#include "mozilla/ErrorNames.h"
#include "mozilla/Logging.h"
#include "mozilla/Preferences.h"
#include "mozilla/net/HttpBaseChannel.h"
#include "mozilla/ClearOnShutdown.h"
#include "mozilla/Unused.h"
namespace mozilla {
namespace net {
//
// MOZ_LOG=nsChannelClassifier:5
//
static LazyLogModule gChannelClassifierLog("nsChannelClassifier");
#undef LOG
#define LOG(args) MOZ_LOG(gChannelClassifierLog, LogLevel::Debug, args)
#define LOG_ENABLED() MOZ_LOG_TEST(gChannelClassifierLog, LogLevel::Debug)
#define URLCLASSIFIER_SKIP_HOSTNAMES "urlclassifier.skipHostnames"
#define URLCLASSIFIER_TRACKING_WHITELIST "urlclassifier.trackingWhitelistTable"
#define URLCLASSIFIER_TRACKING_TABLE "urlclassifier.trackingTable"
// Put CachedPrefs in anonymous namespace to avoid any collision from outside of
// this file.
namespace {
/**
* It is not recommended to read from Preference everytime a channel is
* connected.
* That is not fast and we should cache preference values and reuse them
*/
class CachedPrefs final
{
public:
static CachedPrefs* GetInstance();
void Init();
bool IsAllowListExample() { return sAllowListExample;}
bool IsLowerNetworkPriority() { return sLowerNetworkPriority;}
bool IsAnnotateChannelEnabled() { return sAnnotateChannelEnabled;}
nsCString GetTrackingWhiteList() { return mTrackingWhitelist; }
void SetTrackingWhiteList(const nsACString& aList) { mTrackingWhitelist = aList; }
nsCString GetSkipHostnames() { return mSkipHostnames; }
void SetSkipHostnames(const nsACString& aHostnames) { mSkipHostnames = aHostnames; }
void SetTrackingBlackList(const nsACString& aList) { mTrackingBlacklist = aList; }
nsCString GetTrackingBlackList() { return mTrackingBlacklist; }
private:
friend class StaticAutoPtr<CachedPrefs>;
CachedPrefs();
~CachedPrefs();
static void OnPrefsChange(const char* aPrefName, void* );
// Whether channels should be annotated as being on the tracking protection
// list.
static bool sAnnotateChannelEnabled;
// Whether the priority of the channels annotated as being on the tracking
// protection list should be lowered.
static bool sLowerNetworkPriority;
static bool sAllowListExample;
nsCString mTrackingWhitelist;
nsCString mSkipHostnames;
nsCString mTrackingBlacklist;
static StaticAutoPtr<CachedPrefs> sInstance;
};
bool CachedPrefs::sAllowListExample = false;
bool CachedPrefs::sLowerNetworkPriority = false;
bool CachedPrefs::sAnnotateChannelEnabled = false;
StaticAutoPtr<CachedPrefs> CachedPrefs::sInstance;
// static
void
CachedPrefs::OnPrefsChange(const char* aPref, void* aClosure)
{
CachedPrefs* prefs = static_cast<CachedPrefs*> (aClosure);
if (!strcmp(aPref, URLCLASSIFIER_SKIP_HOSTNAMES)) {
nsCString skipHostnames;
Preferences::GetCString(URLCLASSIFIER_SKIP_HOSTNAMES, skipHostnames);
ToLowerCase(skipHostnames);
prefs->SetSkipHostnames(skipHostnames);
} else if (!strcmp(aPref, URLCLASSIFIER_TRACKING_WHITELIST)) {
nsCString trackingWhitelist;
Preferences::GetCString(URLCLASSIFIER_TRACKING_WHITELIST,
trackingWhitelist);
prefs->SetTrackingWhiteList(trackingWhitelist);
} else if (!strcmp(aPref, URLCLASSIFIER_TRACKING_TABLE)) {
nsCString trackingBlacklist;
Preferences::GetCString(URLCLASSIFIER_TRACKING_TABLE, trackingBlacklist);
prefs->SetTrackingBlackList(trackingBlacklist);
}
}
void
CachedPrefs::Init()
{
Preferences::AddBoolVarCache(&sAnnotateChannelEnabled,
"privacy.trackingprotection.annotate_channels");
Preferences::AddBoolVarCache(&sLowerNetworkPriority,
"privacy.trackingprotection.lower_network_priority");
Preferences::AddBoolVarCache(&sAllowListExample,
"channelclassifier.allowlist_example");
Preferences::RegisterCallbackAndCall(CachedPrefs::OnPrefsChange,
URLCLASSIFIER_SKIP_HOSTNAMES, this);
Preferences::RegisterCallbackAndCall(CachedPrefs::OnPrefsChange,
URLCLASSIFIER_TRACKING_WHITELIST, this);
Preferences::RegisterCallbackAndCall(CachedPrefs::OnPrefsChange,
URLCLASSIFIER_TRACKING_TABLE, this);
}
// static
CachedPrefs*
CachedPrefs::GetInstance()
{
if (!sInstance) {
sInstance = new CachedPrefs();
sInstance->Init();
ClearOnShutdown(&sInstance);
}
MOZ_ASSERT(sInstance);
return sInstance;
}
CachedPrefs::CachedPrefs()
{
MOZ_COUNT_CTOR(CachedPrefs);
}
CachedPrefs::~CachedPrefs()
{
MOZ_COUNT_DTOR(CachedPrefs);
Preferences::UnregisterCallback(CachedPrefs::OnPrefsChange, URLCLASSIFIER_SKIP_HOSTNAMES, this);
Preferences::UnregisterCallback(CachedPrefs::OnPrefsChange, URLCLASSIFIER_TRACKING_WHITELIST, this);
Preferences::UnregisterCallback(CachedPrefs::OnPrefsChange, URLCLASSIFIER_TRACKING_TABLE, this);
}
} // anonymous namespace
static void
SetIsTrackingResourceHelper(nsIChannel* aChannel)
{
MOZ_ASSERT(aChannel);
nsCOMPtr<nsIParentChannel> parentChannel;
NS_QueryNotificationCallbacks(aChannel, parentChannel);
if (parentChannel) {
// This channel is a parent-process proxy for a child process
// request. We should notify the child process as well.
parentChannel->NotifyTrackingResource();
}
RefPtr<HttpBaseChannel> httpChannel = do_QueryObject(aChannel);
if (httpChannel) {
httpChannel->SetIsTrackingResource();
}
}
static void
LowerPriorityHelper(nsIChannel* aChannel)
{
MOZ_ASSERT(aChannel);
bool isBlockingResource = false;
nsCOMPtr<nsIClassOfService> cos(do_QueryInterface(aChannel));
if (cos) {
if (nsContentUtils::IsTailingEnabled()) {
uint32_t cosFlags = 0;
cos->GetClassFlags(&cosFlags);
isBlockingResource = cosFlags & (nsIClassOfService::UrgentStart |
nsIClassOfService::Leader |
nsIClassOfService::Unblocked);
// Requests not allowed to be tailed are usually those with higher
// prioritization. That overweights being a tracker: don't throttle
// them when not in background.
if (!(cosFlags & nsIClassOfService::TailForbidden)) {
cos->AddClassFlags(nsIClassOfService::Throttleable);
}
} else {
// Yes, we even don't want to evaluate the isBlockingResource when tailing is off
// see bug 1395525.
cos->AddClassFlags(nsIClassOfService::Throttleable);
}
}
if (!isBlockingResource) {
nsCOMPtr<nsISupportsPriority> p = do_QueryInterface(aChannel);
if (p) {
p->SetPriority(nsISupportsPriority::PRIORITY_LOWEST);
}
}
}
NS_IMPL_ISUPPORTS(nsChannelClassifier,
nsIURIClassifierCallback,
nsIObserver)
nsChannelClassifier::nsChannelClassifier(nsIChannel *aChannel)
: mIsAllowListed(false),
mSuspendedChannel(false),
mChannel(aChannel),
mTrackingProtectionEnabled(Nothing()),
mTrackingAnnotationEnabled(Nothing())
{
LOG(("nsChannelClassifier::nsChannelClassifier %p", this));
MOZ_ASSERT(mChannel);
}
nsChannelClassifier::~nsChannelClassifier()
{
LOG(("nsChannelClassifier::~nsChannelClassifier %p", this));
}
bool
nsChannelClassifier::ShouldEnableTrackingProtection()
{
if (mTrackingProtectionEnabled) {
return mTrackingProtectionEnabled.value();
}
mTrackingProtectionEnabled = Some(false);
nsCOMPtr<nsILoadContext> loadContext;
NS_QueryNotificationCallbacks(mChannel, loadContext);
if (loadContext && loadContext->UseTrackingProtection()) {
Unused << ShouldEnableTrackingProtectionInternal(
mChannel, false, mTrackingProtectionEnabled.ptr());
}
return mTrackingProtectionEnabled.value();
}
bool
nsChannelClassifier::ShouldEnableTrackingAnnotation()
{
if (mTrackingAnnotationEnabled) {
return mTrackingAnnotationEnabled.value();
}
mTrackingAnnotationEnabled = Some(false);
if (!CachedPrefs::GetInstance()->IsAnnotateChannelEnabled()) {
return mTrackingAnnotationEnabled.value();
}
// If tracking protection is enabled, no need to do channel annotation.
if (ShouldEnableTrackingProtection()) {
return mTrackingAnnotationEnabled.value();
}
// To prevent calling ShouldEnableTrackingProtectionInternal() again,
// check loadContext->UseTrackingProtection() here.
// If loadContext->UseTrackingProtection() is true, here it means
// ShouldEnableTrackingProtectionInternal() has been called before in
// ShouldEnableTrackingProtection() above and the result is false.
// So, we can just return false.
nsCOMPtr<nsILoadContext> loadContext;
NS_QueryNotificationCallbacks(mChannel, loadContext);
if (loadContext && loadContext->UseTrackingProtection()) {
return mTrackingAnnotationEnabled.value();
}
Unused << ShouldEnableTrackingProtectionInternal(
mChannel, true, mTrackingAnnotationEnabled.ptr());
return mTrackingAnnotationEnabled.value();
}
nsresult
nsChannelClassifier::ShouldEnableTrackingProtectionInternal(
nsIChannel *aChannel,
bool aAnnotationsOnly,
bool *result)
{
// Should only be called in the parent process.
MOZ_ASSERT(XRE_IsParentProcess());
NS_ENSURE_ARG(result);
*result = false;
nsresult rv;
nsCOMPtr<mozIThirdPartyUtil> thirdPartyUtil =
do_GetService(THIRDPARTYUTIL_CONTRACTID, &rv);
NS_ENSURE_SUCCESS(rv, rv);
nsCOMPtr<nsIHttpChannelInternal> chan = do_QueryInterface(aChannel, &rv);
if (NS_FAILED(rv) || !chan) {
LOG(("nsChannelClassifier[%p]: Not an HTTP channel", this));
return NS_OK;
}
nsCOMPtr<nsIURI> topWinURI;
rv = chan->GetTopWindowURI(getter_AddRefs(topWinURI));
if (NS_FAILED(rv)) {
return rv;
}
if (!topWinURI) {
LOG(("nsChannelClassifier[%p]: No window URI\n", this));
}
nsCOMPtr<nsIURI> chanURI;
rv = aChannel->GetURI(getter_AddRefs(chanURI));
NS_ENSURE_SUCCESS(rv, rv);
// Third party checks don't work for chrome:// URIs in mochitests, so just
// default to isThirdParty = true. We check isThirdPartyWindow to expand
// the list of domains that are considered first party (e.g., if
// facebook.com includes an iframe from fatratgames.com, all subsources
// included in that iframe are considered third-party with
// isThirdPartyChannel, even if they are not third-party w.r.t.
// facebook.com), and isThirdPartyChannel to prevent top-level navigations
// from being detected as third-party.
bool isThirdPartyChannel = true;
bool isThirdPartyWindow = true;
thirdPartyUtil->IsThirdPartyURI(chanURI, topWinURI, &isThirdPartyWindow);
thirdPartyUtil->IsThirdPartyChannel(aChannel, nullptr, &isThirdPartyChannel);
if (!isThirdPartyWindow || !isThirdPartyChannel) {
*result = false;
if (LOG_ENABLED()) {
LOG(("nsChannelClassifier[%p]: Skipping tracking protection checks "
"for first party or top-level load channel[%p] with uri %s",
this, aChannel, chanURI->GetSpecOrDefault().get()));
}
return NS_OK;
}
// Unlike full Tracking Protection, annotations don't block anything
// so we don't need to take into account add-ons or user exceptions.
if (aAnnotationsOnly) {
*result = true;
return NS_OK;
}
if (AddonMayLoad(aChannel, chanURI)) {
return NS_OK;
}
nsCOMPtr<nsIIOService> ios = do_GetService(NS_IOSERVICE_CONTRACTID, &rv);
NS_ENSURE_SUCCESS(rv, rv);
if (!topWinURI && CachedPrefs::GetInstance()->IsAllowListExample()) {
LOG(("nsChannelClassifier[%p]: Allowlisting test domain\n", this));
rv = ios->NewURI(NS_LITERAL_CSTRING("http://allowlisted.example.com"),
nullptr, nullptr, getter_AddRefs(topWinURI));
NS_ENSURE_SUCCESS(rv, rv);
}
// Take the host/port portion so we can allowlist by site. Also ignore the
// scheme, since users who put sites on the allowlist probably don't expect
// allowlisting to depend on scheme.
nsCOMPtr<nsIURL> url = do_QueryInterface(topWinURI, &rv);
if (NS_FAILED(rv)) {
return rv; // normal for some loads, no need to print a warning
}
nsCString escaped(NS_LITERAL_CSTRING("https://"));
nsAutoCString temp;
rv = url->GetHostPort(temp);
NS_ENSURE_SUCCESS(rv, rv);
escaped.Append(temp);
// Stuff the whole thing back into a URI for the permission manager.
rv = ios->NewURI(escaped, nullptr, nullptr, getter_AddRefs(topWinURI));
NS_ENSURE_SUCCESS(rv, rv);
nsCOMPtr<nsIPermissionManager> permMgr =
do_GetService(NS_PERMISSIONMANAGER_CONTRACTID, &rv);
NS_ENSURE_SUCCESS(rv, rv);
uint32_t permissions = nsIPermissionManager::UNKNOWN_ACTION;
rv = permMgr->TestPermission(topWinURI, "trackingprotection", &permissions);
NS_ENSURE_SUCCESS(rv, rv);
if (permissions == nsIPermissionManager::ALLOW_ACTION) {
LOG(("nsChannelClassifier[%p]: Allowlisting channel[%p] for %s", this,
aChannel, escaped.get()));
mIsAllowListed = true;
*result = false;
} else {
*result = true;
}
// In Private Browsing Mode we also check against an in-memory list.
if (NS_UsePrivateBrowsing(aChannel)) {
nsCOMPtr<nsIPrivateBrowsingTrackingProtectionWhitelist> pbmtpWhitelist =
do_GetService(NS_PBTRACKINGPROTECTIONWHITELIST_CONTRACTID, &rv);
NS_ENSURE_SUCCESS(rv, rv);
bool exists = false;
rv = pbmtpWhitelist->ExistsInAllowList(topWinURI, &exists);
NS_ENSURE_SUCCESS(rv, rv);
if (exists) {
mIsAllowListed = true;
LOG(("nsChannelClassifier[%p]: Allowlisting channel[%p] in PBM for %s",
this, aChannel, escaped.get()));
}
*result = !exists;
}
// Tracking protection will be enabled so return without updating
// the security state. If any channels are subsequently cancelled
// (page elements blocked) the state will be then updated.
if (*result) {
if (LOG_ENABLED()) {
LOG(("nsChannelClassifier[%p]: Enabling tracking protection checks on "
"channel[%p] with uri %s for toplevel window %s", this, aChannel,
chanURI->GetSpecOrDefault().get(),
topWinURI->GetSpecOrDefault().get()));
}
return NS_OK;
}
// Tracking protection will be disabled so update the security state
// of the document and fire a secure change event. If we can't get the
// window for the channel, then the shield won't show up so we can't send
// an event to the securityUI anyway.
return NotifyTrackingProtectionDisabled(aChannel);
}
bool
nsChannelClassifier::AddonMayLoad(nsIChannel *aChannel, nsIURI *aUri)
{
nsCOMPtr<nsILoadInfo> channelLoadInfo = aChannel->GetLoadInfo();
if (!channelLoadInfo)
return false;
// loadingPrincipal is used here to ensure we are loading into an
// addon principal. This allows an addon, with explicit permission, to
// call out to API endpoints that may otherwise get blocked.
nsIPrincipal* loadingPrincipal = channelLoadInfo->LoadingPrincipal();
if (!loadingPrincipal)
return false;
return BasePrincipal::Cast(loadingPrincipal)->AddonAllowsLoad(aUri, true);
}
// static
nsresult
nsChannelClassifier::NotifyTrackingProtectionDisabled(nsIChannel *aChannel)
{
// Can be called in EITHER the parent or child process.
nsCOMPtr<nsIParentChannel> parentChannel;
NS_QueryNotificationCallbacks(aChannel, parentChannel);
if (parentChannel) {
// This channel is a parent-process proxy for a child process request.
// Tell the child process channel to do this instead.
parentChannel->NotifyTrackingProtectionDisabled();
return NS_OK;
}
nsresult rv;
nsCOMPtr<mozIThirdPartyUtil> thirdPartyUtil =
do_GetService(THIRDPARTYUTIL_CONTRACTID, &rv);
NS_ENSURE_SUCCESS(rv, rv);
nsCOMPtr<mozIDOMWindowProxy> win;
rv = thirdPartyUtil->GetTopWindowForChannel(aChannel, getter_AddRefs(win));
NS_ENSURE_SUCCESS(rv, rv);
auto* pwin = nsPIDOMWindowOuter::From(win);
nsCOMPtr<nsIDocShell> docShell = pwin->GetDocShell();
if (!docShell) {
return NS_OK;
}
nsCOMPtr<nsIDocument> doc = docShell->GetDocument();
NS_ENSURE_TRUE(doc, NS_OK);
// Notify nsIWebProgressListeners of this security event.
// Can be used to change the UI state.
nsCOMPtr<nsISecurityEventSink> eventSink = do_QueryInterface(docShell, &rv);
NS_ENSURE_SUCCESS(rv, NS_OK);
uint32_t state = 0;
nsCOMPtr<nsISecureBrowserUI> securityUI;
docShell->GetSecurityUI(getter_AddRefs(securityUI));
if (!securityUI) {
return NS_OK;
}
doc->SetHasTrackingContentLoaded(true);
securityUI->GetState(&state);
state |= nsIWebProgressListener::STATE_LOADED_TRACKING_CONTENT;
eventSink->OnSecurityChange(nullptr, state);
return NS_OK;
}
void
nsChannelClassifier::Start()
{
nsresult rv = StartInternal();
if (NS_FAILED(rv)) {
// If we aren't getting a callback for any reason, assume a good verdict and
// make sure we resume the channel if necessary.
OnClassifyComplete(NS_OK, NS_LITERAL_CSTRING(""),NS_LITERAL_CSTRING(""),
NS_LITERAL_CSTRING(""));
}
}
nsresult
nsChannelClassifier::StartInternal()
{
// Should only be called in the parent process.
MOZ_ASSERT(XRE_IsParentProcess());
// Don't bother to run the classifier on a load that has already failed.
// (this might happen after a redirect)
nsresult status;
mChannel->GetStatus(&status);
if (NS_FAILED(status))
return status;
// Don't bother to run the classifier on a cached load that was
// previously classified as good.
if (HasBeenClassified(mChannel)) {
return NS_ERROR_UNEXPECTED;
}
nsCOMPtr<nsIURI> uri;
nsresult rv = mChannel->GetURI(getter_AddRefs(uri));
NS_ENSURE_SUCCESS(rv, rv);
// Don't bother checking certain types of URIs.
bool isAbout = false;
rv = uri->SchemeIs("about", &isAbout);
NS_ENSURE_SUCCESS(rv, rv);
if (isAbout) return NS_ERROR_UNEXPECTED;
bool hasFlags;
rv = NS_URIChainHasFlags(uri,
nsIProtocolHandler::URI_DANGEROUS_TO_LOAD,
&hasFlags);
NS_ENSURE_SUCCESS(rv, rv);
if (hasFlags) return NS_ERROR_UNEXPECTED;
rv = NS_URIChainHasFlags(uri,
nsIProtocolHandler::URI_IS_LOCAL_FILE,
&hasFlags);
NS_ENSURE_SUCCESS(rv, rv);
if (hasFlags) return NS_ERROR_UNEXPECTED;
rv = NS_URIChainHasFlags(uri,
nsIProtocolHandler::URI_IS_UI_RESOURCE,
&hasFlags);
NS_ENSURE_SUCCESS(rv, rv);
if (hasFlags) return NS_ERROR_UNEXPECTED;
rv = NS_URIChainHasFlags(uri,
nsIProtocolHandler::URI_IS_LOCAL_RESOURCE,
&hasFlags);
NS_ENSURE_SUCCESS(rv, rv);
if (hasFlags) return NS_ERROR_UNEXPECTED;
nsCString skipHostnames = CachedPrefs::GetInstance()->GetSkipHostnames();
if (!skipHostnames.IsEmpty()) {
LOG(("nsChannelClassifier[%p]:StartInternal whitelisted hostnames = %s",
this, skipHostnames.get()));
if (IsHostnameWhitelisted(uri, skipHostnames)) {
return NS_ERROR_UNEXPECTED;
}
}
nsCOMPtr<nsIURIClassifier> uriClassifier =
do_GetService(NS_URICLASSIFIERSERVICE_CONTRACTID, &rv);
if (rv == NS_ERROR_FACTORY_NOT_REGISTERED ||
rv == NS_ERROR_NOT_AVAILABLE) {
// no URI classifier, ignore this failure.
return NS_ERROR_NOT_AVAILABLE;
}
NS_ENSURE_SUCCESS(rv, rv);
nsCOMPtr<nsIScriptSecurityManager> securityManager =
do_GetService(NS_SCRIPTSECURITYMANAGER_CONTRACTID, &rv);
NS_ENSURE_SUCCESS(rv, rv);
nsCOMPtr<nsIPrincipal> principal;
rv = securityManager->GetChannelURIPrincipal(mChannel, getter_AddRefs(principal));
NS_ENSURE_SUCCESS(rv, rv);
bool expectCallback;
if (LOG_ENABLED()) {
nsCOMPtr<nsIURI> principalURI;
principal->GetURI(getter_AddRefs(principalURI));
LOG(("nsChannelClassifier[%p]: Classifying principal %s on channel with "
"uri %s", this, principalURI->GetSpecOrDefault().get(),
uri->GetSpecOrDefault().get()));
}
// The classify is running in parent process, no need to give a valid event
// target
rv = uriClassifier->Classify(principal, nullptr,
false,
this, &expectCallback);
if (NS_FAILED(rv)) {
return rv;
}
if (expectCallback) {
// Suspend the channel, it will be resumed when we get the classifier
// callback.
rv = mChannel->Suspend();
if (NS_FAILED(rv)) {
// Some channels (including nsJSChannel) fail on Suspend. This
// shouldn't be fatal, but will prevent malware from being
// blocked on these channels.
LOG(("nsChannelClassifier[%p]: Couldn't suspend channel", this));
return rv;
}
mSuspendedChannel = true;
LOG(("nsChannelClassifier[%p]: suspended channel %p",
this, mChannel.get()));
} else {
LOG(("nsChannelClassifier[%p]: not expecting callback", this));
return NS_ERROR_FAILURE;
}
// Add an observer for shutdown
AddShutdownObserver();
return NS_OK;
}
bool
nsChannelClassifier::IsHostnameWhitelisted(nsIURI *aUri,
const nsACString &aWhitelisted)
{
nsAutoCString host;
nsresult rv = aUri->GetHost(host);
if (NS_FAILED(rv) || host.IsEmpty()) {
return false;
}
ToLowerCase(host);
nsCCharSeparatedTokenizer tokenizer(aWhitelisted, ',');
while (tokenizer.hasMoreTokens()) {
const nsACString& token = tokenizer.nextToken();
if (token.Equals(host)) {
LOG(("nsChannelClassifier[%p]:StartInternal skipping %s (whitelisted)",
this, host.get()));
return true;
}
}
return false;
}
// Note in the cache entry that this URL was classified, so that future
// cached loads don't need to be checked.
void
nsChannelClassifier::MarkEntryClassified(nsresult status)
{
// Should only be called in the parent process.
MOZ_ASSERT(XRE_IsParentProcess());
// Don't cache tracking classifications because we support allowlisting.
if (status == NS_ERROR_TRACKING_URI || mIsAllowListed) {
return;
}
if (LOG_ENABLED()) {
nsAutoCString errorName;
GetErrorName(status, errorName);
nsCOMPtr<nsIURI> uri;
mChannel->GetURI(getter_AddRefs(uri));
nsAutoCString spec;
uri->GetAsciiSpec(spec);
LOG(("nsChannelClassifier::MarkEntryClassified[%s] %s",
errorName.get(), spec.get()));
}
nsCOMPtr<nsICachingChannel> cachingChannel = do_QueryInterface(mChannel);
if (!cachingChannel) {
return;
}
nsCOMPtr<nsISupports> cacheToken;
cachingChannel->GetCacheToken(getter_AddRefs(cacheToken));
if (!cacheToken) {
return;
}
nsCOMPtr<nsICacheEntry> cacheEntry =
do_QueryInterface(cacheToken);
if (!cacheEntry) {
return;
}
cacheEntry->SetMetaDataElement("necko:classified",
NS_SUCCEEDED(status) ? "1" : nullptr);
}
bool
nsChannelClassifier::HasBeenClassified(nsIChannel *aChannel)
{
// Should only be called in the parent process.
MOZ_ASSERT(XRE_IsParentProcess());
nsCOMPtr<nsICachingChannel> cachingChannel =
do_QueryInterface(aChannel);
if (!cachingChannel) {
return false;
}
// Only check the tag if we are loading from the cache without
// validation.
bool fromCache;
if (NS_FAILED(cachingChannel->IsFromCache(&fromCache)) || !fromCache) {
return false;
}
nsCOMPtr<nsISupports> cacheToken;
cachingChannel->GetCacheToken(getter_AddRefs(cacheToken));
if (!cacheToken) {
return false;
}
nsCOMPtr<nsICacheEntry> cacheEntry =
do_QueryInterface(cacheToken);
if (!cacheEntry) {
return false;
}
nsCString tag;
cacheEntry->GetMetaDataElement("necko:classified", getter_Copies(tag));
return tag.EqualsLiteral("1");
}
//static
bool
nsChannelClassifier::SameLoadingURI(nsIDocument *aDoc, nsIChannel *aChannel)
{
nsCOMPtr<nsIURI> docURI = aDoc->GetDocumentURI();
nsCOMPtr<nsILoadInfo> channelLoadInfo = aChannel->GetLoadInfo();
if (!channelLoadInfo || !docURI) {
return false;
}
nsCOMPtr<nsIPrincipal> channelLoadingPrincipal = channelLoadInfo->LoadingPrincipal();
if (!channelLoadingPrincipal) {
// TYPE_DOCUMENT loads will not have a channelLoadingPrincipal. But top level
// loads should not be blocked by Tracking Protection, so we will return
// false
return false;
}
nsCOMPtr<nsIURI> channelLoadingURI;
channelLoadingPrincipal->GetURI(getter_AddRefs(channelLoadingURI));
if (!channelLoadingURI) {
return false;
}
bool equals = false;
nsresult rv = docURI->EqualsExceptRef(channelLoadingURI, &equals);
return NS_SUCCEEDED(rv) && equals;
}
// static
nsresult
nsChannelClassifier::SetBlockedContent(nsIChannel *channel,
nsresult aErrorCode,
const nsACString& aList,
const nsACString& aProvider,
const nsACString& aFullHash)
{
NS_ENSURE_ARG(!aList.IsEmpty());
// Can be called in EITHER the parent or child process.
nsCOMPtr<nsIParentChannel> parentChannel;
NS_QueryNotificationCallbacks(channel, parentChannel);
if (parentChannel) {
// This channel is a parent-process proxy for a child process request.
// Tell the child process channel to do this instead.
parentChannel->SetClassifierMatchedInfo(aList, aProvider, aFullHash);
return NS_OK;
}
nsresult rv;
nsCOMPtr<nsIClassifiedChannel> classifiedChannel = do_QueryInterface(channel, &rv);
NS_ENSURE_SUCCESS(rv, rv);
if (classifiedChannel) {
classifiedChannel->SetMatchedInfo(aList, aProvider, aFullHash);
}
nsCOMPtr<mozIDOMWindowProxy> win;
nsCOMPtr<mozIThirdPartyUtil> thirdPartyUtil =
do_GetService(THIRDPARTYUTIL_CONTRACTID, &rv);
NS_ENSURE_SUCCESS(rv, NS_OK);
rv = thirdPartyUtil->GetTopWindowForChannel(channel, getter_AddRefs(win));
NS_ENSURE_SUCCESS(rv, NS_OK);
auto* pwin = nsPIDOMWindowOuter::From(win);
nsCOMPtr<nsIDocShell> docShell = pwin->GetDocShell();
if (!docShell) {
return NS_OK;
}
nsCOMPtr<nsIDocument> doc = docShell->GetDocument();
NS_ENSURE_TRUE(doc, NS_OK);
// This event might come after the user has navigated to another page.
// To prevent showing the TrackingProtection UI on the wrong page, we need to
// check that the loading URI for the channel is the same as the URI currently
// loaded in the document.
if (!SameLoadingURI(doc, channel)) {
return NS_OK;
}
// Notify nsIWebProgressListeners of this security event.
// Can be used to change the UI state.
nsCOMPtr<nsISecurityEventSink> eventSink = do_QueryInterface(docShell, &rv);
NS_ENSURE_SUCCESS(rv, NS_OK);
uint32_t state = 0;
nsCOMPtr<nsISecureBrowserUI> securityUI;
docShell->GetSecurityUI(getter_AddRefs(securityUI));
if (!securityUI) {
return NS_OK;
}
securityUI->GetState(&state);
if (aErrorCode == NS_ERROR_TRACKING_URI) {
doc->SetHasTrackingContentBlocked(true);
state |= nsIWebProgressListener::STATE_BLOCKED_TRACKING_CONTENT;
} else {
state |= nsIWebProgressListener::STATE_BLOCKED_UNSAFE_CONTENT;
}
eventSink->OnSecurityChange(channel, state);
// Log a warning to the web console.
nsCOMPtr<nsIURI> uri;
channel->GetURI(getter_AddRefs(uri));
NS_ConvertUTF8toUTF16 spec(uri->GetSpecOrDefault());
const char16_t* params[] = { spec.get() };
const char* message = (aErrorCode == NS_ERROR_TRACKING_URI) ?
"TrackingUriBlocked" : "UnsafeUriBlocked";
nsCString category = (aErrorCode == NS_ERROR_TRACKING_URI) ?
NS_LITERAL_CSTRING("Tracking Protection") :
NS_LITERAL_CSTRING("Safe Browsing");
nsContentUtils::ReportToConsole(nsIScriptError::warningFlag,
category,
doc,
nsContentUtils::eNECKO_PROPERTIES,
message,
params, ArrayLength(params));
return NS_OK;
}
namespace {
// This class is designed to get the results of checking blacklist and whitelist.
// |mExpectWhitelistResult| is used to indicate that |OnClassifyComplete| is called
// for the result of blacklist or whitelist check.
class TrackingURICallback final : public nsIURIClassifierCallback {
public:
NS_DECL_THREADSAFE_ISUPPORTS
NS_DECL_NSIURICLASSIFIERCALLBACK
explicit TrackingURICallback(nsChannelClassifier* aChannelClassifier,
std::function<void()>&& aCallback)
: mChannelClassifier(aChannelClassifier)
, mChannelCallback(std::move(aCallback))
, mExpectWhitelistResult(false)
{
MOZ_ASSERT(mChannelClassifier);
}
private:
~TrackingURICallback() = default;
nsresult OnBlacklistResult(nsresult aErrorCode);
nsresult OnWhitelistResult(nsresult aErrorCode);
void OnTrackerFound(nsresult aErrorCode);
RefPtr<nsChannelClassifier> mChannelClassifier;
std::function<void()> mChannelCallback;
bool mExpectWhitelistResult;
// Only need to save the result of blacklist check.
nsCString mList;
nsCString mProvider;
nsCString mFullHash;
};
NS_IMPL_ISUPPORTS(TrackingURICallback, nsIURIClassifierCallback)
/*virtual*/ nsresult
TrackingURICallback::OnClassifyComplete(nsresult aErrorCode,
const nsACString& aLists,
const nsACString& aProvider,
const nsACString& aFullHash)
{
if (!mExpectWhitelistResult) {
nsresult status = aLists.IsEmpty() ? NS_OK : NS_ERROR_TRACKING_URI;
mList = aLists;
mProvider = aProvider;
mFullHash = aFullHash;
return OnBlacklistResult(status);
}
nsresult status = aLists.IsEmpty() ? NS_ERROR_TRACKING_URI : NS_OK;
return OnWhitelistResult(status);
}
nsresult
TrackingURICallback::OnBlacklistResult(nsresult aErrorCode)
{
LOG(("TrackingURICallback[%p]::OnBlacklistResult aErrorCode=0x%" PRIx32,
mChannelClassifier.get(), static_cast<uint32_t>(aErrorCode)));
if (NS_SUCCEEDED(aErrorCode)) {
mChannelCallback();
return NS_OK;
}
if (LOG_ENABLED()) {
nsCOMPtr<nsIChannel> channel = mChannelClassifier->GetChannel();
nsCOMPtr<nsIURI> uri;
channel->GetURI(getter_AddRefs(uri));
LOG(("TrackingURICallback[%p]::OnBlacklistResult channel [%p] "
"uri=%s, is in blacklist. Start checking whitelist.",
mChannelClassifier.get(), channel.get(),
uri->GetSpecOrDefault().get()));
}
nsCOMPtr<nsIURI> whitelistURI = mChannelClassifier->CreateWhiteListURI();
// If IsTrackerWhitelisted has failed, it means the uri is not in whitelist.
if (NS_FAILED(mChannelClassifier->IsTrackerWhitelisted(whitelistURI, this))) {
LOG(("TrackingURICallback[%p]:OnBlacklistResult "
"IsTrackerWhitelisted has failed.",
mChannelClassifier.get()));
OnTrackerFound(aErrorCode);
mChannelCallback();
} else {
mExpectWhitelistResult = true;
}
return NS_OK;
}
nsresult
TrackingURICallback::OnWhitelistResult(nsresult aErrorCode)
{
LOG(("TrackingURICallback[%p]::OnWhitelistResult aErrorCode=0x%" PRIx32,
mChannelClassifier.get(), static_cast<uint32_t>(aErrorCode)));
if (NS_SUCCEEDED(aErrorCode)) {
LOG(("TrackingURICallback[%p]::OnWhitelistResult tracker found "
"in whitelist so we won't block it", mChannelClassifier.get()));
mChannelCallback();
return NS_OK;
}
if (LOG_ENABLED()) {
nsCOMPtr<nsIChannel> channel = mChannelClassifier->GetChannel();
nsCOMPtr<nsIURI> uri;
channel->GetURI(getter_AddRefs(uri));
LOG(("TrackingURICallback[%p]::OnWhitelistResult "
"channel [%p] uri=%s, is not in whitelist",
mChannelClassifier.get(), channel.get(),
uri->GetSpecOrDefault().get()));
}
OnTrackerFound(aErrorCode);
mChannelCallback();
return NS_OK;
}
void
TrackingURICallback::OnTrackerFound(nsresult aErrorCode)
{
nsCOMPtr<nsIChannel> channel = mChannelClassifier->GetChannel();
if (mChannelClassifier->ShouldEnableTrackingProtection()) {
mChannelClassifier->SetBlockedContent(channel, aErrorCode,
mList, mProvider, mFullHash);
channel->Cancel(aErrorCode);
} else {
MOZ_ASSERT(mChannelClassifier->ShouldEnableTrackingAnnotation());
SetIsTrackingResourceHelper(channel);
if (CachedPrefs::GetInstance()->IsLowerNetworkPriority()) {
LowerPriorityHelper(channel);
}
}
}
} // end of unnamed namespace/
already_AddRefed<nsIURI>
nsChannelClassifier::CreateWhiteListURI() const
{
nsresult rv;
nsCOMPtr<nsIHttpChannelInternal> chan = do_QueryInterface(mChannel, &rv);
if (!chan) {
return nullptr;
}
nsCOMPtr<nsIURI> topWinURI;
rv = chan->GetTopWindowURI(getter_AddRefs(topWinURI));
NS_ENSURE_SUCCESS(rv, nullptr);
if (!topWinURI) {
LOG(("nsChannelClassifier[%p]: No window URI", this));
return nullptr;
}
nsCOMPtr<nsIScriptSecurityManager> securityManager =
do_GetService(NS_SCRIPTSECURITYMANAGER_CONTRACTID, &rv);
NS_ENSURE_SUCCESS(rv, nullptr);
nsCOMPtr<nsIPrincipal> chanPrincipal;
rv = securityManager->GetChannelURIPrincipal(mChannel,
getter_AddRefs(chanPrincipal));
if (NS_FAILED(rv)) {
return nullptr;
}
// Craft a whitelist URL like "toplevel.page/?resource=third.party.domain"
nsAutoCString pageHostname, resourceDomain;
rv = topWinURI->GetHost(pageHostname);
NS_ENSURE_SUCCESS(rv, nullptr);
rv = chanPrincipal->GetBaseDomain(resourceDomain);
NS_ENSURE_SUCCESS(rv, nullptr);
nsAutoCString whitelistEntry = NS_LITERAL_CSTRING("http://") +
pageHostname + NS_LITERAL_CSTRING("/?resource=") + resourceDomain;
LOG(("nsChannelClassifier[%p]: Looking for %s in the whitelist",
this, whitelistEntry.get()));
nsCOMPtr<nsIURI> whitelistURI;
rv = NS_NewURI(getter_AddRefs(whitelistURI), whitelistEntry);
return NS_SUCCEEDED(rv) ? whitelistURI.forget() : nullptr;
}
nsresult
nsChannelClassifier::IsTrackerWhitelisted(nsIURI* aWhiteListURI,
nsIURIClassifierCallback *aCallback)
{
if (!aCallback || !aWhiteListURI) {
return NS_ERROR_INVALID_ARG;
}
nsresult rv;
nsCOMPtr<nsIURIClassifier> uriClassifier =
do_GetService(NS_URICLASSIFIERSERVICE_CONTRACTID, &rv);
NS_ENSURE_SUCCESS(rv, rv);
nsCString trackingWhitelist = CachedPrefs::GetInstance()->GetTrackingWhiteList();
if (trackingWhitelist.IsEmpty()) {
LOG(("nsChannelClassifier[%p]:IsTrackerWhitelisted whitelist disabled",
this));
return NS_ERROR_TRACKING_URI;
}
return uriClassifier->AsyncClassifyLocalWithTables(aWhiteListURI, trackingWhitelist, aCallback);
}
/* static */
nsresult
nsChannelClassifier::SendThreatHitReport(nsIChannel *aChannel,
const nsACString& aProvider,
const nsACString& aList,
const nsACString& aFullHash)
{
NS_ENSURE_ARG_POINTER(aChannel);
nsAutoCString provider(aProvider);
nsPrintfCString reportEnablePref("browser.safebrowsing.provider.%s.dataSharing.enabled",
provider.get());
if (!Preferences::GetBool(reportEnablePref.get(), false)) {
LOG(("nsChannelClassifier::SendThreatHitReport data sharing disabled for %s",
provider.get()));
return NS_OK;
}
nsCOMPtr<nsIURIClassifier> uriClassifier =
do_GetService(NS_URLCLASSIFIERDBSERVICE_CONTRACTID);
if (!uriClassifier) {
return NS_ERROR_UNEXPECTED;
}
nsresult rv = uriClassifier->SendThreatHitReport(aChannel, aProvider, aList,
aFullHash);
NS_ENSURE_SUCCESS(rv, rv);
return NS_OK;
}
NS_IMETHODIMP
nsChannelClassifier::OnClassifyComplete(nsresult aErrorCode,
const nsACString& aList,
const nsACString& aProvider,
const nsACString& aFullHash)
{
// Should only be called in the parent process.
MOZ_ASSERT(XRE_IsParentProcess());
MOZ_ASSERT(aErrorCode != NS_ERROR_TRACKING_URI);
if (mSuspendedChannel) {
nsAutoCString errorName;
if (LOG_ENABLED()) {
GetErrorName(aErrorCode, errorName);
LOG(("nsChannelClassifier[%p]:OnClassifyComplete %s (suspended channel)",
this, errorName.get()));
}
MarkEntryClassified(aErrorCode);
if (NS_FAILED(aErrorCode)) {
if (LOG_ENABLED()) {
nsCOMPtr<nsIURI> uri;
mChannel->GetURI(getter_AddRefs(uri));
LOG(("nsChannelClassifier[%p]: cancelling channel %p for %s "
"with error code %s", this, mChannel.get(),
uri->GetSpecOrDefault().get(), errorName.get()));
}
// Channel will be cancelled (page element blocked) due to Safe Browsing.
// Do update the security state of the document and fire a security
// change event.
SetBlockedContent(mChannel, aErrorCode, aList, aProvider, aFullHash);
if (aErrorCode == NS_ERROR_MALWARE_URI ||
aErrorCode == NS_ERROR_PHISHING_URI ||
aErrorCode == NS_ERROR_UNWANTED_URI ||
aErrorCode == NS_ERROR_HARMFUL_URI) {
SendThreatHitReport(mChannel, aProvider, aList, aFullHash);
}
mChannel->Cancel(aErrorCode);
}
LOG(("nsChannelClassifier[%p]: resuming channel %p from "
"OnClassifyComplete", this, mChannel.get()));
mChannel->Resume();
}
mChannel = nullptr;
RemoveShutdownObserver();
return NS_OK;
}
nsresult
nsChannelClassifier::CheckIsTrackerWithLocalTable(std::function<void()>&& aCallback)
{
nsresult rv;
if (!aCallback) {
return NS_ERROR_INVALID_ARG;
}
nsCOMPtr<nsIURIClassifier> uriClassifier =
do_GetService(NS_URICLASSIFIERSERVICE_CONTRACTID, &rv);
if (NS_FAILED(rv)) {
return rv;
}
if (!ShouldEnableTrackingProtection() && !ShouldEnableTrackingAnnotation()) {
return NS_ERROR_FAILURE;
}
nsCOMPtr<nsIURI> uri;
rv = mChannel->GetURI(getter_AddRefs(uri));
if (NS_FAILED(rv) || !uri) {
return rv;
}
nsCString trackingBlacklist =
CachedPrefs::GetInstance()->GetTrackingBlackList();
if (trackingBlacklist.IsEmpty()) {
LOG(("nsChannelClassifier[%p]:CheckIsTrackerWithLocalTable blacklist is empty",
this));
return NS_ERROR_FAILURE;
}
nsCOMPtr<nsIURIClassifierCallback> callback =
new TrackingURICallback(this, std::move(aCallback));
LOG(("nsChannelClassifier[%p]:CheckIsTrackerWithLocalTable for uri=%s\n",
this, uri->GetSpecOrDefault().get()));
return uriClassifier->AsyncClassifyLocalWithTables(uri,
trackingBlacklist,
callback);
}
already_AddRefed<nsIChannel>
nsChannelClassifier::GetChannel()
{
nsCOMPtr<nsIChannel> channel = mChannel;
return channel.forget();
}
void
nsChannelClassifier::AddShutdownObserver()
{
nsCOMPtr<nsIObserverService> observerService = mozilla::services::GetObserverService();
if (observerService) {
observerService->AddObserver(this, "profile-change-net-teardown", false);
}
}
void
nsChannelClassifier::RemoveShutdownObserver()
{
nsCOMPtr<nsIObserverService> observerService = mozilla::services::GetObserverService();
if (observerService) {
observerService->RemoveObserver(this, "profile-change-net-teardown");
}
}
///////////////////////////////////////////////////////////////////////////////
// nsIObserver implementation
NS_IMETHODIMP
nsChannelClassifier::Observe(nsISupports *aSubject, const char *aTopic,
const char16_t *aData)
{
if (!strcmp(aTopic, "profile-change-net-teardown")) {
// If we aren't getting a callback for any reason, make sure
// we resume the channel.
if (mChannel && mSuspendedChannel) {
mSuspendedChannel = false;
mChannel->Cancel(NS_ERROR_ABORT);
mChannel->Resume();
mChannel = nullptr;
}
RemoveShutdownObserver();
}
return NS_OK;
}
#undef LOG_ENABLED
} // namespace net
} // namespace mozilla
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