107 lines
4.1 KiB
C++
107 lines
4.1 KiB
C++
// Copyright 2014 The Chromium Authors
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef COMPONENTS_METRICS_CLONED_INSTALL_DETECTOR_H_
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#define COMPONENTS_METRICS_CLONED_INSTALL_DETECTOR_H_
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#include "base/callback_list.h"
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#include "base/functional/callback_forward.h"
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#include "base/gtest_prod_util.h"
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#include "base/memory/weak_ptr.h"
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class PrefRegistrySimple;
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class PrefService;
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namespace metrics {
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// A struct that holds cloned install related fields in prefs that need to be
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// reported in the system_profile.
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struct ClonedInstallInfo {
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int64_t last_reset_timestamp;
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int64_t first_reset_timestamp;
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int reset_count;
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};
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// A class for detecting if an install is cloned. It does this by detecting
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// when the hardware running Chrome changes.
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class ClonedInstallDetector {
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public:
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ClonedInstallDetector();
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ClonedInstallDetector(const ClonedInstallDetector&) = delete;
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ClonedInstallDetector& operator=(const ClonedInstallDetector&) = delete;
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virtual ~ClonedInstallDetector();
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// Posts a task to |task_runner| to generate a machine ID and store it to a
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// local state pref. If the newly generated ID is different than the
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// previously stored one, then the install is considered cloned. The ID is a
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// 24-bit value based off of machine characteristics. This value should never
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// be sent over the network.
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void CheckForClonedInstall(PrefService* local_state);
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static void RegisterPrefs(PrefRegistrySimple* registry);
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// Reads cloned install info fields from |local_state| and returns them in
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// a ClonedInstallInfo.
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static ClonedInstallInfo ReadClonedInstallInfo(PrefService* local_state);
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// Clears cloned install info fields from |local_state|.
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static void ClearClonedInstallInfo(PrefService* local_state);
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// Updates cloned install info fields in |local_state| on reset.
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static void RecordClonedInstallInfo(PrefService* local_state);
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// Returns true for the whole session if we detected a cloned install during
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// the construction of a client id.
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bool ShouldResetClientIds(PrefService* local_state);
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// Returns true for the whole session if we detect a cloned install this
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// session.
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bool ClonedInstallDetectedInCurrentSession() const;
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// Adds a callback that is run if this install is detected as cloned during
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// this session. If this is called after the detection had already occurred,
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// the callback is run immediately.
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base::CallbackListSubscription AddOnClonedInstallDetectedCallback(
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base::OnceClosure callback);
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// Wrapper around SaveMachineId(). Used for testing in UKM (the tests cannot
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// be declared as friends since they live in a different namespace).
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void SaveMachineIdForTesting(PrefService* local_state,
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const std::string& raw_id);
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private:
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FRIEND_TEST_ALL_PREFIXES(ClonedInstallDetectorTest, SaveId);
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FRIEND_TEST_ALL_PREFIXES(ClonedInstallDetectorTest, DetectClone);
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FRIEND_TEST_ALL_PREFIXES(ClonedInstallDetectorTest, ShouldResetClientIds);
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FRIEND_TEST_ALL_PREFIXES(ClonedInstallDetectorTest,
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ClonedInstallDetectedInCurrentSession);
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FRIEND_TEST_ALL_PREFIXES(ClonedInstallDetectorTest,
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ClonedInstallDetectedCallback);
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FRIEND_TEST_ALL_PREFIXES(MetricsStateManagerTest, CheckProviderResetIds);
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FRIEND_TEST_ALL_PREFIXES(MetricsServiceTestWithFeatures,
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PurgeLogsOnClonedInstallDetected);
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// Converts raw_id into a 24-bit hash and stores the hash in |local_state|.
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// |raw_id| is not a const ref because it's passed from a cross-thread post
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// task.
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void SaveMachineId(PrefService* local_state, const std::string& raw_id);
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// Indicates that we detected a cloned install during the current session.
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bool detected_this_session_ = false;
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// Indicates that we detected a cloned install during the construction of a
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// client id and should reset client ids as a result.
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bool should_reset_client_ids_ = false;
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base::OnceClosureList callback_list_;
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base::WeakPtrFactory<ClonedInstallDetector> weak_ptr_factory_{this};
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};
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} // namespace metrics
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#endif // COMPONENTS_METRICS_CLONED_INSTALL_DETECTOR_H_
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