1 files changed, 217 insertions, 0 deletions
diff --git a/netwerk/url-classifier/UrlClassifierFeatureTrackingProtection.cpp b/netwerk/url-classifier/UrlClassifierFeatureTrackingProtection.cpp
new file mode 100644
index 0000000000..8c50b33d4d
--- /dev/null
+++ b/netwerk/url-classifier/UrlClassifierFeatureTrackingProtection.cpp
@@ -0,0 +1,217 @@
+/* -*- 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 "UrlClassifierFeatureTrackingProtection.h"
+
+#include "mozilla/AntiTrackingUtils.h"
+#include "mozilla/net/UrlClassifierCommon.h"
+#include "ChannelClassifierService.h"
+#include "nsIChannel.h"
+#include "nsIHttpChannelInternal.h"
+#include "nsILoadContext.h"
+#include "nsNetUtil.h"
+#include "mozilla/StaticPtr.h"
+#include "nsXULAppAPI.h"
+#include "nsIWebProgressListener.h"
+
+namespace mozilla {
+namespace net {
+
+namespace {
+
+#define TRACKING_PROTECTION_FEATURE_NAME "tracking-protection"
+
+#define URLCLASSIFIER_TRACKING_BLOCKLIST "urlclassifier.trackingTable"
+#define URLCLASSIFIER_TRACKING_BLOCKLIST_TEST_ENTRIES \
+  "urlclassifier.trackingTable.testEntries"
+#define URLCLASSIFIER_TRACKING_ENTITYLIST "urlclassifier.trackingWhitelistTable"
+#define URLCLASSIFIER_TRACKING_ENTITYLIST_TEST_ENTRIES \
+  "urlclassifier.trackingWhitelistTable.testEntries"
+#define URLCLASSIFIER_TRACKING_PROTECTION_EXCEPTION_URLS \
+  "urlclassifier.trackingSkipURLs"
+#define TABLE_TRACKING_BLOCKLIST_PREF "tracking-blocklist-pref"
+#define TABLE_TRACKING_ENTITYLIST_PREF "tracking-entitylist-pref"
+
+StaticRefPtr<UrlClassifierFeatureTrackingProtection> gFeatureTrackingProtection;
+
+}  // namespace
+
+UrlClassifierFeatureTrackingProtection::UrlClassifierFeatureTrackingProtection()
+    : UrlClassifierFeatureAntiTrackingBase(
+          nsLiteralCString(TRACKING_PROTECTION_FEATURE_NAME),
+          nsLiteralCString(URLCLASSIFIER_TRACKING_BLOCKLIST),
+          nsLiteralCString(URLCLASSIFIER_TRACKING_ENTITYLIST),
+          nsLiteralCString(URLCLASSIFIER_TRACKING_BLOCKLIST_TEST_ENTRIES),
+          nsLiteralCString(URLCLASSIFIER_TRACKING_ENTITYLIST_TEST_ENTRIES),
+          nsLiteralCString(TABLE_TRACKING_BLOCKLIST_PREF),
+          nsLiteralCString(TABLE_TRACKING_ENTITYLIST_PREF),
+          nsLiteralCString(URLCLASSIFIER_TRACKING_PROTECTION_EXCEPTION_URLS)) {}
+
+/* static */ const char* UrlClassifierFeatureTrackingProtection::Name() {
+  return TRACKING_PROTECTION_FEATURE_NAME;
+}
+
+/* static */
+void UrlClassifierFeatureTrackingProtection::MaybeInitialize() {
+  MOZ_ASSERT(XRE_IsParentProcess());
+  UC_LOG_LEAK(("UrlClassifierFeatureTrackingProtection::MaybeInitialize"));
+
+  if (!gFeatureTrackingProtection) {
+    gFeatureTrackingProtection = new UrlClassifierFeatureTrackingProtection();
+    gFeatureTrackingProtection->InitializePreferences();
+  }
+}
+
+/* static */
+void UrlClassifierFeatureTrackingProtection::MaybeShutdown() {
+  UC_LOG_LEAK(("UrlClassifierFeatureTrackingProtection::MaybeShutdown"));
+
+  if (gFeatureTrackingProtection) {
+    gFeatureTrackingProtection->ShutdownPreferences();
+    gFeatureTrackingProtection = nullptr;
+  }
+}
+
+/* static */
+already_AddRefed<UrlClassifierFeatureTrackingProtection>
+UrlClassifierFeatureTrackingProtection::MaybeCreate(nsIChannel* aChannel) {
+  MOZ_ASSERT(aChannel);
+
+  UC_LOG_LEAK(
+      ("UrlClassifierFeatureTrackingProtection::MaybeCreate - channel %p",
+       aChannel));
+
+  nsCOMPtr<nsILoadContext> loadContext;
+  NS_QueryNotificationCallbacks(aChannel, loadContext);
+  if (!loadContext) {
+    // Some channels don't have a loadcontext, check the global tracking
+    // protection preference.
+    if (!StaticPrefs::privacy_trackingprotection_enabled() &&
+        !(NS_UsePrivateBrowsing(aChannel) &&
+          StaticPrefs::privacy_trackingprotection_pbmode_enabled())) {
+      return nullptr;
+    }
+  } else if (!loadContext->UseTrackingProtection()) {
+    return nullptr;
+  }
+
+  bool isThirdParty = AntiTrackingUtils::IsThirdPartyChannel(aChannel);
+  if (!isThirdParty) {
+    UC_LOG(
+        ("UrlClassifierFeatureTrackingProtection::MaybeCreate - "
+         "skipping first party or top-level load for channel %p",
+         aChannel));
+    return nullptr;
+  }
+
+  if (!UrlClassifierCommon::ShouldEnableProtectionForChannel(aChannel)) {
+    return nullptr;
+  }
+
+  MaybeInitialize();
+  MOZ_ASSERT(gFeatureTrackingProtection);
+
+  RefPtr<UrlClassifierFeatureTrackingProtection> self =
+      gFeatureTrackingProtection;
+  return self.forget();
+}
+
+/* static */
+already_AddRefed<nsIUrlClassifierFeature>
+UrlClassifierFeatureTrackingProtection::GetIfNameMatches(
+    const nsACString& aName) {
+  if (!aName.EqualsLiteral(TRACKING_PROTECTION_FEATURE_NAME)) {
+    return nullptr;
+  }
+
+  MaybeInitialize();
+  MOZ_ASSERT(gFeatureTrackingProtection);
+
+  RefPtr<UrlClassifierFeatureTrackingProtection> self =
+      gFeatureTrackingProtection;
+  return self.forget();
+}
+
+NS_IMETHODIMP
+UrlClassifierFeatureTrackingProtection::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_TRACKING_CONTENT
+            : nsIWebProgressListener::STATE_ALLOWED_TRACKING_CONTENT;
+
+    // Need to set aBlocked to True if we replace the Tracker with a shim,
+    //  since the shim is treated as a blocked event
+    // Note: If we need to account for which kind of tracker was replaced,
+    //  we need to create a new event type in nsIWebProgressListener
+    if (event == nsIWebProgressListener::STATE_REPLACED_TRACKING_CONTENT) {
+      ContentBlockingNotifier::OnEvent(aChannel, event, true);
+    } else {
+      ContentBlockingNotifier::OnEvent(aChannel, event, false);
+    }
+
+    *aShouldContinue = true;
+    return NS_OK;
+  }
+
+  UrlClassifierCommon::SetBlockedContent(aChannel, NS_ERROR_TRACKING_URI, list,
+                                         ""_ns, ""_ns);
+
+  UC_LOG(
+      ("UrlClassifierFeatureTrackingProtection::ProcessChannel - "
+       "cancelling channel %p",
+       aChannel));
+
+  nsCOMPtr<nsIHttpChannelInternal> httpChannel = do_QueryInterface(aChannel);
+  if (httpChannel) {
+    Unused << httpChannel->CancelByURLClassifier(NS_ERROR_TRACKING_URI);
+  } else {
+    Unused << aChannel->Cancel(NS_ERROR_TRACKING_URI);
+  }
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+UrlClassifierFeatureTrackingProtection::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