Jeff Pu | 3e7448d | 2023-12-07 17:25:22 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2023 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | #define LOG_TAG "FaceVirtualHalLockoutTracker" |
| 18 | |
| 19 | #include "FakeLockoutTracker.h" |
| 20 | #include <android-base/logging.h> |
| 21 | #include <face.sysprop.h> |
Jeff Pu | a3c5736 | 2024-06-10 15:03:50 +0000 | [diff] [blame] | 22 | #include "Face.h" |
Jeff Pu | 3e7448d | 2023-12-07 17:25:22 +0000 | [diff] [blame] | 23 | #include "util/Util.h" |
| 24 | |
| 25 | using namespace ::android::face::virt; |
| 26 | |
| 27 | namespace aidl::android::hardware::biometrics::face { |
| 28 | |
| 29 | void FakeLockoutTracker::reset(bool dueToTimerExpire) { |
| 30 | if (!dueToTimerExpire) { |
| 31 | mFailedCount = 0; |
| 32 | mLastFailedTime = 0; |
| 33 | } |
| 34 | mTimedFailedCount = 0; |
| 35 | mCurrentMode = LockoutMode::kNone; |
| 36 | abortTimer(); |
| 37 | } |
| 38 | |
| 39 | void FakeLockoutTracker::addFailedAttempt(ISessionCallback* cb) { |
Jeff Pu | a3c5736 | 2024-06-10 15:03:50 +0000 | [diff] [blame] | 40 | bool lockoutEnabled = Face::cfg().get<bool>("lockout_enable"); |
| 41 | bool timedLockoutenabled = Face::cfg().get<bool>("lockout_timed_enable"); |
Jeff Pu | 3e7448d | 2023-12-07 17:25:22 +0000 | [diff] [blame] | 42 | if (lockoutEnabled) { |
| 43 | mFailedCount++; |
| 44 | mTimedFailedCount++; |
| 45 | mLastFailedTime = Util::getSystemNanoTime(); |
Jeff Pu | a3c5736 | 2024-06-10 15:03:50 +0000 | [diff] [blame] | 46 | int32_t lockoutTimedThreshold = Face::cfg().get<std::int32_t>("lockout_timed_threshold"); |
Jeff Pu | 3e7448d | 2023-12-07 17:25:22 +0000 | [diff] [blame] | 47 | int32_t lockoutPermanetThreshold = |
Jeff Pu | a3c5736 | 2024-06-10 15:03:50 +0000 | [diff] [blame] | 48 | Face::cfg().get<std::int32_t>("lockout_permanent_threshold"); |
Jeff Pu | 3e7448d | 2023-12-07 17:25:22 +0000 | [diff] [blame] | 49 | if (mFailedCount >= lockoutPermanetThreshold) { |
| 50 | mCurrentMode = LockoutMode::kPermanent; |
| 51 | LOG(ERROR) << "FakeLockoutTracker: lockoutPermanent"; |
| 52 | cb->onLockoutPermanent(); |
| 53 | abortTimer(); |
| 54 | } else if (timedLockoutenabled && mTimedFailedCount >= lockoutTimedThreshold) { |
| 55 | if (mCurrentMode == LockoutMode::kNone) { |
| 56 | mCurrentMode = LockoutMode::kTimed; |
| 57 | startLockoutTimer(getTimedLockoutDuration(), cb); |
| 58 | } |
| 59 | LOG(ERROR) << "FakeLockoutTracker: lockoutTimed"; |
| 60 | cb->onLockoutTimed(getLockoutTimeLeft()); |
| 61 | } |
| 62 | } else { |
| 63 | reset(); |
| 64 | } |
| 65 | } |
| 66 | |
| 67 | FakeLockoutTracker::LockoutMode FakeLockoutTracker::getMode() { |
| 68 | return mCurrentMode; |
| 69 | } |
| 70 | |
| 71 | int32_t FakeLockoutTracker::getTimedLockoutDuration() { |
Jeff Pu | a3c5736 | 2024-06-10 15:03:50 +0000 | [diff] [blame] | 72 | return Face::cfg().get<std::int32_t>("lockout_timed_duration"); |
Jeff Pu | 3e7448d | 2023-12-07 17:25:22 +0000 | [diff] [blame] | 73 | } |
| 74 | |
| 75 | int64_t FakeLockoutTracker::getLockoutTimeLeft() { |
| 76 | int64_t res = 0; |
| 77 | |
| 78 | if (mLastFailedTime > 0) { |
| 79 | auto now = Util::getSystemNanoTime(); |
| 80 | auto elapsed = (now - mLastFailedTime) / 1000000LL; |
| 81 | res = getTimedLockoutDuration() - elapsed; |
| 82 | LOG(INFO) << "elapsed=" << elapsed << " now = " << now |
| 83 | << " mLastFailedTime=" << mLastFailedTime << " res=" << res; |
| 84 | } |
| 85 | |
| 86 | return res; |
| 87 | } |
| 88 | |
| 89 | bool FakeLockoutTracker::checkIfLockout(ISessionCallback* cb) { |
| 90 | if (mCurrentMode == LockoutMode::kPermanent) { |
| 91 | LOG(ERROR) << "Lockout permanent"; |
| 92 | cb->onLockoutPermanent(); |
| 93 | return true; |
| 94 | } else if (mCurrentMode == LockoutMode::kTimed) { |
| 95 | auto timeLeft = getLockoutTimeLeft(); |
| 96 | LOG(ERROR) << "Lockout timed " << timeLeft; |
| 97 | cb->onLockoutTimed(timeLeft); |
| 98 | return true; |
| 99 | } |
| 100 | return false; |
| 101 | } |
| 102 | |
| 103 | void FakeLockoutTracker::startLockoutTimer(int64_t timeout, ISessionCallback* cb) { |
| 104 | LOG(ERROR) << "startLockoutTimer: to=" << timeout; |
| 105 | if (mIsLockoutTimerStarted) return; |
| 106 | std::function<void(ISessionCallback*)> action = |
| 107 | std::bind(&FakeLockoutTracker::lockoutTimerExpired, this, std::placeholders::_1); |
| 108 | std::thread([timeout, action, cb]() { |
| 109 | std::this_thread::sleep_for(std::chrono::milliseconds(timeout)); |
| 110 | action(cb); |
| 111 | }).detach(); |
| 112 | |
| 113 | mIsLockoutTimerStarted = true; |
| 114 | } |
| 115 | |
| 116 | void FakeLockoutTracker::lockoutTimerExpired(ISessionCallback* cb) { |
| 117 | LOG(INFO) << "lockout timer expired"; |
| 118 | mIsLockoutTimerStarted = false; |
| 119 | |
| 120 | if (mIsLockoutTimerAborted) { |
| 121 | mIsLockoutTimerAborted = false; |
| 122 | return; |
| 123 | } |
| 124 | |
| 125 | // if more failures seen since the timer started, need to restart timer again |
| 126 | auto deltaTime = getLockoutTimeLeft(); |
| 127 | if (deltaTime <= 0) { |
| 128 | cb->onLockoutCleared(); |
| 129 | reset(true); |
| 130 | } else { |
| 131 | startLockoutTimer(deltaTime, cb); |
| 132 | } |
| 133 | } |
| 134 | |
| 135 | void FakeLockoutTracker::abortTimer() { |
| 136 | if (mIsLockoutTimerStarted) mIsLockoutTimerAborted = true; |
| 137 | } |
| 138 | |
| 139 | } // namespace aidl::android::hardware::biometrics::face |