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-rw-r--r--netwerk/url-classifier/UrlClassifierFeatureFingerprintingProtection.cpp216
1 files changed, 216 insertions, 0 deletions
diff --git a/netwerk/url-classifier/UrlClassifierFeatureFingerprintingProtection.cpp b/netwerk/url-classifier/UrlClassifierFeatureFingerprintingProtection.cpp
new file mode 100644
index 0000000000..16a352e484
--- /dev/null
+++ b/netwerk/url-classifier/UrlClassifierFeatureFingerprintingProtection.cpp
@@ -0,0 +1,216 @@
+/* -*- 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 "UrlClassifierFeatureFingerprintingProtection.h"
+
+#include "mozilla/AntiTrackingUtils.h"
+#include "mozilla/net/UrlClassifierCommon.h"
+#include "ChannelClassifierService.h"
+#include "mozilla/StaticPrefs_privacy.h"
+#include "nsNetUtil.h"
+#include "mozilla/StaticPtr.h"
+#include "nsIWebProgressListener.h"
+#include "nsIHttpChannelInternal.h"
+#include "nsIChannel.h"
+
+namespace mozilla {
+namespace net {
+
+namespace {
+
+#define FINGERPRINTING_FEATURE_NAME "fingerprinting-protection"
+
+#define URLCLASSIFIER_FINGERPRINTING_BLOCKLIST \
+ "urlclassifier.features.fingerprinting.blacklistTables"
+#define URLCLASSIFIER_FINGERPRINTING_BLOCKLIST_TEST_ENTRIES \
+ "urlclassifier.features.fingerprinting.blacklistHosts"
+#define URLCLASSIFIER_FINGERPRINTING_ENTITYLIST \
+ "urlclassifier.features.fingerprinting.whitelistTables"
+#define URLCLASSIFIER_FINGERPRINTING_ENTITYLIST_TEST_ENTRIES \
+ "urlclassifier.features.fingerprinting.whitelistHosts"
+#define URLCLASSIFIER_FINGERPRINTING_EXCEPTION_URLS \
+ "urlclassifier.features.fingerprinting.skipURLs"
+#define TABLE_FINGERPRINTING_BLOCKLIST_PREF "fingerprinting-blacklist-pref"
+#define TABLE_FINGERPRINTING_ENTITYLIST_PREF "fingerprinting-whitelist-pref"
+
+StaticRefPtr<UrlClassifierFeatureFingerprintingProtection>
+ gFeatureFingerprintingProtection;
+
+} // namespace
+
+UrlClassifierFeatureFingerprintingProtection::
+ UrlClassifierFeatureFingerprintingProtection()
+ : UrlClassifierFeatureAntiTrackingBase(
+ nsLiteralCString(FINGERPRINTING_FEATURE_NAME),
+ nsLiteralCString(URLCLASSIFIER_FINGERPRINTING_BLOCKLIST),
+ nsLiteralCString(URLCLASSIFIER_FINGERPRINTING_ENTITYLIST),
+ nsLiteralCString(URLCLASSIFIER_FINGERPRINTING_BLOCKLIST_TEST_ENTRIES),
+ nsLiteralCString(
+ URLCLASSIFIER_FINGERPRINTING_ENTITYLIST_TEST_ENTRIES),
+ nsLiteralCString(TABLE_FINGERPRINTING_BLOCKLIST_PREF),
+ nsLiteralCString(TABLE_FINGERPRINTING_ENTITYLIST_PREF),
+ nsLiteralCString(URLCLASSIFIER_FINGERPRINTING_EXCEPTION_URLS)) {}
+
+/* static */ const char* UrlClassifierFeatureFingerprintingProtection::Name() {
+ return FINGERPRINTING_FEATURE_NAME;
+}
+
+/* static */
+void UrlClassifierFeatureFingerprintingProtection::MaybeInitialize() {
+ UC_LOG_LEAK(
+ ("UrlClassifierFeatureFingerprintingProtection::MaybeInitialize"));
+
+ if (!gFeatureFingerprintingProtection) {
+ gFeatureFingerprintingProtection =
+ new UrlClassifierFeatureFingerprintingProtection();
+ gFeatureFingerprintingProtection->InitializePreferences();
+ }
+}
+
+/* static */
+void UrlClassifierFeatureFingerprintingProtection::MaybeShutdown() {
+ UC_LOG_LEAK(("UrlClassifierFeatureFingerprintingProtection::MaybeShutdown"));
+
+ if (gFeatureFingerprintingProtection) {
+ gFeatureFingerprintingProtection->ShutdownPreferences();
+ gFeatureFingerprintingProtection = nullptr;
+ }
+}
+
+/* static */
+already_AddRefed<UrlClassifierFeatureFingerprintingProtection>
+UrlClassifierFeatureFingerprintingProtection::MaybeCreate(
+ nsIChannel* aChannel) {
+ MOZ_ASSERT(aChannel);
+
+ UC_LOG_LEAK(
+ ("UrlClassifierFeatureFingerprintingProtection::MaybeCreate - channel %p",
+ aChannel));
+
+ if (!StaticPrefs::privacy_trackingprotection_fingerprinting_enabled()) {
+ return nullptr;
+ }
+
+ bool isThirdParty = AntiTrackingUtils::IsThirdPartyChannel(aChannel);
+ if (!isThirdParty) {
+ UC_LOG(
+ ("UrlClassifierFeatureFingerprintingProtection::MaybeCreate - "
+ "skipping first party or top-level load for channel %p",
+ aChannel));
+ return nullptr;
+ }
+
+ if (UrlClassifierCommon::IsPassiveContent(aChannel)) {
+ return nullptr;
+ }
+
+ if (!UrlClassifierCommon::ShouldEnableProtectionForChannel(aChannel)) {
+ return nullptr;
+ }
+
+ MaybeInitialize();
+ MOZ_ASSERT(gFeatureFingerprintingProtection);
+
+ RefPtr<UrlClassifierFeatureFingerprintingProtection> self =
+ gFeatureFingerprintingProtection;
+ return self.forget();
+}
+
+/* static */
+already_AddRefed<nsIUrlClassifierFeature>
+UrlClassifierFeatureFingerprintingProtection::GetIfNameMatches(
+ const nsACString& aName) {
+ if (!aName.EqualsLiteral(FINGERPRINTING_FEATURE_NAME)) {
+ return nullptr;
+ }
+
+ MaybeInitialize();
+ MOZ_ASSERT(gFeatureFingerprintingProtection);
+
+ RefPtr<UrlClassifierFeatureFingerprintingProtection> self =
+ gFeatureFingerprintingProtection;
+ return self.forget();
+}
+
+NS_IMETHODIMP
+UrlClassifierFeatureFingerprintingProtection::ProcessChannel(
+ nsIChannel* aChannel, const nsTArray<nsCString>& aList,
+ const nsTArray<nsCString>& aHashes, bool* aShouldContinue) {
+ NS_ENSURE_ARG_POINTER(aChannel);
+ NS_ENSURE_ARG_POINTER(aShouldContinue);
+
+ bool isAllowListed = UrlClassifierCommon::IsAllowListed(aChannel);
+
+ // This is a blocking feature.
+ *aShouldContinue = isAllowListed;
+
+ if (isAllowListed) {
+ return NS_OK;
+ }
+
+ nsAutoCString list;
+ UrlClassifierCommon::TablesToString(aList, list);
+
+ ChannelBlockDecision decision =
+ ChannelClassifierService::OnBeforeBlockChannel(aChannel, mName, list);
+ if (decision != ChannelBlockDecision::Blocked) {
+ uint32_t event =
+ decision == ChannelBlockDecision::Replaced
+ ? nsIWebProgressListener::STATE_REPLACED_FINGERPRINTING_CONTENT
+ : nsIWebProgressListener::STATE_ALLOWED_FINGERPRINTING_CONTENT;
+
+ // Need to set aBlocked to True if we replace the Fingerprinter with a shim,
+ // since the shim is treated as a blocked event
+ if (event ==
+ nsIWebProgressListener::STATE_REPLACED_FINGERPRINTING_CONTENT) {
+ ContentBlockingNotifier::OnEvent(aChannel, event, true);
+ } else {
+ ContentBlockingNotifier::OnEvent(aChannel, event, false);
+ }
+
+ *aShouldContinue = true;
+ return NS_OK;
+ }
+
+ UrlClassifierCommon::SetBlockedContent(aChannel, NS_ERROR_FINGERPRINTING_URI,
+ list, ""_ns, ""_ns);
+
+ UC_LOG(
+ ("UrlClassifierFeatureFingerprintingProtection::ProcessChannel - "
+ "cancelling channel %p",
+ aChannel));
+
+ nsCOMPtr<nsIHttpChannelInternal> httpChannel = do_QueryInterface(aChannel);
+ if (httpChannel) {
+ Unused << httpChannel->CancelByURLClassifier(NS_ERROR_FINGERPRINTING_URI);
+ } else {
+ Unused << aChannel->Cancel(NS_ERROR_FINGERPRINTING_URI);
+ }
+
+ return NS_OK;
+}
+
+NS_IMETHODIMP
+UrlClassifierFeatureFingerprintingProtection::GetURIByListType(
+ nsIChannel* aChannel, nsIUrlClassifierFeature::listType aListType,
+ nsIUrlClassifierFeature::URIType* aURIType, nsIURI** aURI) {
+ NS_ENSURE_ARG_POINTER(aChannel);
+ NS_ENSURE_ARG_POINTER(aURIType);
+ NS_ENSURE_ARG_POINTER(aURI);
+
+ if (aListType == nsIUrlClassifierFeature::blocklist) {
+ *aURIType = nsIUrlClassifierFeature::blocklistURI;
+ return aChannel->GetURI(aURI);
+ }
+
+ MOZ_ASSERT(aListType == nsIUrlClassifierFeature::entitylist);
+
+ *aURIType = nsIUrlClassifierFeature::pairwiseEntitylistURI;
+ return UrlClassifierCommon::CreatePairwiseEntityListURI(aChannel, aURI);
+}
+
+} // namespace net
+} // namespace mozilla