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