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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/. */
+
+#ifndef mozilla_net_CookieJarSettings_h
+#define mozilla_net_CookieJarSettings_h
+
+#include "mozilla/Maybe.h"
+
+#include "nsICookieJarSettings.h"
+#include "nsTArray.h"
+
+#define COOKIEJARSETTINGS_CONTRACTID "@mozilla.org/cookieJarSettings;1"
+// 4ce234f1-52e8-47a9-8c8d-b02f815733c7
+#define COOKIEJARSETTINGS_CID \
+ { \
+ 0x4ce234f1, 0x52e8, 0x47a9, { \
+ 0x8c, 0x8d, 0xb0, 0x2f, 0x81, 0x57, 0x33, 0xc7 \
+ } \
+ }
+
+class nsIPermission;
+
+namespace mozilla {
+namespace net {
+
+class CookieJarSettingsArgs;
+
+/**
+ * CookieJarSettings
+ * ~~~~~~~~~~~~~~
+ *
+ * CookieJarSettings is a snapshot of the cookie jar's configurations in a
+ * precise moment of time, such as the cookie policy and cookie permissions.
+ * This object is used by top-level documents to have a consistent cookie jar
+ * configuration also in case the user changes it. New configurations will apply
+ * only to new top-level documents.
+ *
+ * CookieJarSettings creation
+ * ~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ * CookieJarSettings is created when the top-level document's nsIChannel's
+ * nsILoadInfo is constructed. Any sub-resource and any sub-document inherits it
+ * from that nsILoadInfo. Also dedicated workers and their resources inherit it
+ * from the parent document.
+ *
+ * SharedWorkers and ServiceWorkers have their own CookieJarSettings because
+ * they don't have a single parent document (SharedWorkers could have more than
+ * one, ServiceWorkers have none).
+ *
+ * In Chrome code, we have a new CookieJarSettings when we download resources
+ * via 'Save-as...' and we also have a new CookieJarSettings for favicon
+ * downloading.
+ *
+ * Content-scripts WebExtensions also have their own CookieJarSettings because
+ * they don't have a direct access to the document they are running into.
+ *
+ * Anything else will have a special CookieJarSettings which blocks everything
+ * (CookieJarSettings::GetBlockingAll()) by forcing BEHAVIOR_REJECT as policy.
+ * When this happens, that context will not have access to the cookie jar and no
+ * cookies are sent or received.
+ *
+ * Propagation of CookieJarSettings
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ * CookieJarSettings are shared inside the same top-level document via its
+ * nsIChannel's nsILoadInfo. This is done automatically if you pass a nsINode
+ * to NS_NewChannel(), and it must be done manually if you use a different
+ * channel constructor. For instance, this happens for any worker networking
+ * operation.
+ *
+ * We use the same CookieJarSettings for any resource belonging to the top-level
+ * document even if cross-origin. This makes the browser behave consistently a
+ * scenario where A loads B which loads A again, and cookie policy/permission
+ * changes in the meantime.
+ *
+ * Cookie Permissions propagation
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ * CookieJarSettings populates the known cookie permissions only when required.
+ * Initially the list is empty, but when CookieJarSettings::CookiePermission()
+ * is called, the requested permission is stored in the internal list if it
+ * doesn't exist yet.
+ *
+ * This is actually nice because it relies on the permission propagation from
+ * parent to content process. No extra IPC is required.
+ *
+ * Note that we store permissions with UNKNOWN_ACTION values too because they
+ * can be set after the loading of the top-level document and we don't want to
+ * return a different value when this happens.
+ *
+ * Use of CookieJarSettings
+ * ~~~~~~~~~~~~~~~~~~~~~
+ *
+ * In theory, there should not be direct access to cookie permissions or
+ * cookieBehavior pref. Everything should pass through CookieJarSettings.
+ *
+ * A reference to CookieJarSettings can be obtained from
+ * nsILoadInfo::GetCookieJarSettings(), from Document::CookieJarSettings() and
+ * from the WorkerPrivate::CookieJarSettings().
+ *
+ * CookieJarSettings is thread-safe, but the permission list must be touched
+ * only on the main-thread.
+ *
+ * Testing
+ * ~~~~~~~
+ *
+ * If you need to test the changing of cookie policy or a cookie permission, you
+ * need to workaround CookieJarSettings. This can be done opening a new window
+ * and running the test into that new global.
+ */
+
+/**
+ * Class that provides an nsICookieJarSettings implementation.
+ */
+class CookieJarSettings final : public nsICookieJarSettings {
+ public:
+ typedef nsTArray<RefPtr<nsIPermission>> CookiePermissionList;
+
+ NS_DECL_THREADSAFE_ISUPPORTS
+ NS_DECL_NSICOOKIEJARSETTINGS
+ NS_DECL_NSISERIALIZABLE
+
+ static already_AddRefed<nsICookieJarSettings> GetBlockingAll(
+ bool aShouldResistFingerprinting);
+
+ enum CreateMode { eRegular, ePrivate };
+
+ static already_AddRefed<nsICookieJarSettings> Create(
+ CreateMode aMode, bool aShouldResistFingerprinting);
+
+ static already_AddRefed<nsICookieJarSettings> Create(
+ nsIPrincipal* aPrincipal);
+
+ // This function should be only called for XPCOM. You should never use this
+ // for other purposes.
+ static already_AddRefed<nsICookieJarSettings> CreateForXPCOM();
+
+ static already_AddRefed<nsICookieJarSettings> Create(
+ uint32_t aCookieBehavior, const nsAString& aPartitionKey,
+ bool aIsFirstPartyIsolated, bool aIsOnContentBlockingAllowList,
+ bool aShouldResistFingerprinting);
+
+ static CookieJarSettings* Cast(nsICookieJarSettings* aCS) {
+ return static_cast<CookieJarSettings*>(aCS);
+ }
+
+ void Serialize(CookieJarSettingsArgs& aData);
+
+ static void Deserialize(const CookieJarSettingsArgs& aData,
+ nsICookieJarSettings** aCookieJarSettings);
+
+ void Merge(const CookieJarSettingsArgs& aData);
+
+ // We don't want to send this object from parent to child process if there are
+ // no reasons. HasBeenChanged() returns true if the object has changed its
+ // internal state and it must be sent beck to the content process.
+ bool HasBeenChanged() const { return mToBeMerged; }
+
+ void UpdateIsOnContentBlockingAllowList(nsIChannel* aChannel);
+
+ void SetPartitionKey(nsIURI* aURI);
+ void SetPartitionKey(const nsAString& aPartitionKey) {
+ mPartitionKey = aPartitionKey;
+ }
+ const nsAString& GetPartitionKey() { return mPartitionKey; };
+
+ void SetFingerprintingRandomizationKey(const nsTArray<uint8_t>& aKey) {
+ mFingerprintingRandomKey.reset();
+
+ mFingerprintingRandomKey.emplace(aKey.Clone());
+ }
+
+ // Utility function to test if the passed cookiebahvior is
+ // BEHAVIOR_REJECT_TRACKER, BEHAVIOR_REJECT_TRACKER_AND_PARTITION_FOREIGN or
+ // BEHAVIOR_REJECT_FOREIGN when
+ // network.cookie.rejectForeignWithExceptions.enabled pref is set to true.
+ static bool IsRejectThirdPartyContexts(uint32_t aCookieBehavior);
+
+ // This static method returns true if aCookieBehavior is
+ // BEHAVIOR_REJECT_FOREIGN and
+ // network.cookie.rejectForeignWithExceptions.enabled pref is set to true.
+ static bool IsRejectThirdPartyWithExceptions(uint32_t aCookieBehavior);
+
+ private:
+ enum State {
+ // No cookie permissions are allowed to be stored in this object.
+ eFixed,
+
+ // Cookie permissions can be stored in case they are unknown when they are
+ // asked or when they are sent from the parent process.
+ eProgressive,
+ };
+
+ CookieJarSettings(uint32_t aCookieBehavior, bool aIsFirstPartyIsolated,
+ bool aShouldResistFingerprinting, State aState);
+ ~CookieJarSettings();
+
+ uint32_t mCookieBehavior;
+ bool mIsFirstPartyIsolated;
+ CookiePermissionList mCookiePermissions;
+ bool mIsOnContentBlockingAllowList;
+ bool mIsOnContentBlockingAllowListUpdated;
+ nsString mPartitionKey;
+
+ State mState;
+
+ bool mToBeMerged;
+
+ // DO NOT USE THIS MEMBER TO CHECK IF YOU SHOULD RESIST FINGERPRINTING.
+ // USE THE nsContentUtils::ShouldResistFingerprinting() METHODS ONLY.
+ //
+ // As we move to fine-grained RFP control, we want to support per-domain
+ // exemptions from ResistFingerprinting. Specifically the behavior should be
+ // as such:
+ //
+ // Top-Level Document is on an Exempted Domain
+ // - RFP is disabled.
+ //
+ // Top-Level Document on an Exempted Domain embedding a non-exempted
+ // cross-origin iframe
+ // - RFP in the iframe is enabled (NOT exempted). (**)
+ //
+ // Top-Level Document on an Exempted Domain embedding an exempted cross-origin
+ // iframe
+ // - RFP in the iframe is disabled (exempted).
+ //
+ // Top-Level Document on a Non-Exempted Domain
+ // - RFP is enabled (NOT exempted).
+ //
+ // Top-Level Document on a Non-Exempted Domain embeds an exempted cross-origin
+ // iframe
+ // - RFP in the iframe is enabled (NOT exempted). (*)
+ //
+ // Exempted Document (top-level or iframe) contacts any cross-origin domain
+ // (exempted or non-exempted)
+ // - RFP is disabled (exempted) for the request
+ //
+ // Non-Exempted Document (top-level or iframe) contacts any cross-origin
+ // domain
+ // (exempted or non-exempted)
+ // - RFP is enabled (NOT exempted) for the request
+ //
+ // This boolean on CookieJarSettings will enable us to apply the most
+ // difficult rule, marked in (*). (It is difficult because the
+ // subdocument's loadinfo will look like it should be exempted.)
+ // However if we trusted this member blindly, it would not correctly apply
+ // the one marked with (**). (Because it would inherit an exemption into
+ // a subdocument that should not be exempted.)
+ // To handle this case, we only trust a CookieJar's ShouldRFP value if it
+ // says we should resist fingerprinting. If it says that we _should not_,
+ // we continue and check the channel's URI or LoadInfo and if
+ // the domain specified there is not an exempted domain, enforce RFP anyway.
+ // This all occurrs in the nscontentUtils::ShouldResistFingerprinting
+ // functions which you should be using.
+ bool mShouldResistFingerprinting;
+
+ // The key used to generate the random noise for randomizing the browser
+ // fingerprint. The key is decided by the session key and the top-level site.
+ // So, the browse fingerprint will look different to the same tracker
+ // under different top-level sites. Also, the fingerprint will change as
+ // browsing session changes. This can prevent trackers to identify individuals
+ // by using browser fingerprints.
+ Maybe<nsTArray<uint8_t>> mFingerprintingRandomKey;
+};
+
+} // namespace net
+} // namespace mozilla
+
+#endif // mozilla_net_CookieJarSettings_h