| /* |
| * Copyright (C) 2015 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License |
| */ |
| |
| package com.android.server.locksettings; |
| |
| import static com.android.internal.widget.LockPatternUtils.StrongAuthTracker.STRONG_AUTH_NOT_REQUIRED; |
| import static com.android.internal.widget.LockPatternUtils.StrongAuthTracker.STRONG_AUTH_REQUIRED_AFTER_TIMEOUT; |
| |
| import android.app.AlarmManager; |
| import android.app.AlarmManager.OnAlarmListener; |
| import android.app.admin.DevicePolicyManager; |
| import android.app.trust.IStrongAuthTracker; |
| import android.content.Context; |
| import android.hardware.biometrics.BiometricManager; |
| import android.os.Handler; |
| import android.os.Message; |
| import android.os.RemoteCallbackList; |
| import android.os.RemoteException; |
| import android.os.SystemClock; |
| import android.os.UserHandle; |
| import android.util.ArrayMap; |
| import android.util.Slog; |
| import android.util.SparseIntArray; |
| |
| import com.android.internal.widget.LockPatternUtils.StrongAuthTracker; |
| |
| /** |
| * Keeps track of requests for strong authentication. |
| */ |
| public class LockSettingsStrongAuth { |
| |
| private static final String TAG = "LockSettings"; |
| |
| private static final int MSG_REQUIRE_STRONG_AUTH = 1; |
| private static final int MSG_REGISTER_TRACKER = 2; |
| private static final int MSG_UNREGISTER_TRACKER = 3; |
| private static final int MSG_REMOVE_USER = 4; |
| private static final int MSG_SCHEDULE_STRONG_AUTH_TIMEOUT = 5; |
| |
| private static final String STRONG_AUTH_TIMEOUT_ALARM_TAG = |
| "LockSettingsStrongAuth.timeoutForUser"; |
| |
| private final RemoteCallbackList<IStrongAuthTracker> mTrackers = new RemoteCallbackList<>(); |
| private final SparseIntArray mStrongAuthForUser = new SparseIntArray(); |
| private final ArrayMap<Integer, StrongAuthTimeoutAlarmListener> |
| mStrongAuthTimeoutAlarmListenerForUser = new ArrayMap<>(); |
| private final int mDefaultStrongAuthFlags; |
| private final Context mContext; |
| |
| private AlarmManager mAlarmManager; |
| private BiometricManager mBiometricManager; |
| |
| public LockSettingsStrongAuth(Context context) { |
| mContext = context; |
| mDefaultStrongAuthFlags = StrongAuthTracker.getDefaultFlags(context); |
| mAlarmManager = context.getSystemService(AlarmManager.class); |
| } |
| |
| public void systemReady() { |
| if (BiometricManager.hasBiometrics(mContext)) { |
| mBiometricManager = mContext.getSystemService(BiometricManager.class); |
| } |
| } |
| |
| private void handleAddStrongAuthTracker(IStrongAuthTracker tracker) { |
| mTrackers.register(tracker); |
| |
| for (int i = 0; i < mStrongAuthForUser.size(); i++) { |
| int key = mStrongAuthForUser.keyAt(i); |
| int value = mStrongAuthForUser.valueAt(i); |
| try { |
| tracker.onStrongAuthRequiredChanged(value, key); |
| } catch (RemoteException e) { |
| Slog.e(TAG, "Exception while adding StrongAuthTracker.", e); |
| } |
| } |
| } |
| |
| private void handleRemoveStrongAuthTracker(IStrongAuthTracker tracker) { |
| mTrackers.unregister(tracker); |
| } |
| |
| private void handleRequireStrongAuth(int strongAuthReason, int userId) { |
| if (userId == UserHandle.USER_ALL) { |
| for (int i = 0; i < mStrongAuthForUser.size(); i++) { |
| int key = mStrongAuthForUser.keyAt(i); |
| handleRequireStrongAuthOneUser(strongAuthReason, key); |
| } |
| } else { |
| handleRequireStrongAuthOneUser(strongAuthReason, userId); |
| } |
| } |
| |
| private void handleRequireStrongAuthOneUser(int strongAuthReason, int userId) { |
| int oldValue = mStrongAuthForUser.get(userId, mDefaultStrongAuthFlags); |
| int newValue = strongAuthReason == STRONG_AUTH_NOT_REQUIRED |
| ? STRONG_AUTH_NOT_REQUIRED |
| : (oldValue | strongAuthReason); |
| if (oldValue != newValue) { |
| mStrongAuthForUser.put(userId, newValue); |
| notifyStrongAuthTrackers(newValue, userId); |
| } |
| } |
| |
| private void handleRemoveUser(int userId) { |
| int index = mStrongAuthForUser.indexOfKey(userId); |
| if (index >= 0) { |
| mStrongAuthForUser.removeAt(index); |
| notifyStrongAuthTrackers(mDefaultStrongAuthFlags, userId); |
| } |
| } |
| |
| private void handleScheduleStrongAuthTimeout(int userId) { |
| final DevicePolicyManager dpm = |
| (DevicePolicyManager) mContext.getSystemService(Context.DEVICE_POLICY_SERVICE); |
| long when = SystemClock.elapsedRealtime() + dpm.getRequiredStrongAuthTimeout(null, userId); |
| // cancel current alarm listener for the user (if there was one) |
| StrongAuthTimeoutAlarmListener alarm = mStrongAuthTimeoutAlarmListenerForUser.get(userId); |
| if (alarm != null) { |
| mAlarmManager.cancel(alarm); |
| } else { |
| alarm = new StrongAuthTimeoutAlarmListener(userId); |
| mStrongAuthTimeoutAlarmListenerForUser.put(userId, alarm); |
| } |
| // schedule a new alarm listener for the user |
| mAlarmManager.set(AlarmManager.ELAPSED_REALTIME, when, STRONG_AUTH_TIMEOUT_ALARM_TAG, |
| alarm, mHandler); |
| } |
| |
| private void notifyStrongAuthTrackers(int strongAuthReason, int userId) { |
| int i = mTrackers.beginBroadcast(); |
| try { |
| while (i > 0) { |
| i--; |
| try { |
| mTrackers.getBroadcastItem(i).onStrongAuthRequiredChanged( |
| strongAuthReason, userId); |
| } catch (RemoteException e) { |
| Slog.e(TAG, "Exception while notifying StrongAuthTracker.", e); |
| } |
| } |
| } finally { |
| mTrackers.finishBroadcast(); |
| } |
| } |
| |
| public void registerStrongAuthTracker(IStrongAuthTracker tracker) { |
| mHandler.obtainMessage(MSG_REGISTER_TRACKER, tracker).sendToTarget(); |
| } |
| |
| public void unregisterStrongAuthTracker(IStrongAuthTracker tracker) { |
| mHandler.obtainMessage(MSG_UNREGISTER_TRACKER, tracker).sendToTarget(); |
| } |
| |
| public void removeUser(int userId) { |
| final int argNotUsed = 0; |
| mHandler.obtainMessage(MSG_REMOVE_USER, userId, argNotUsed).sendToTarget(); |
| } |
| |
| public void requireStrongAuth(int strongAuthReason, int userId) { |
| if (userId == UserHandle.USER_ALL || userId >= UserHandle.USER_SYSTEM) { |
| mHandler.obtainMessage(MSG_REQUIRE_STRONG_AUTH, strongAuthReason, |
| userId).sendToTarget(); |
| } else { |
| throw new IllegalArgumentException( |
| "userId must be an explicit user id or USER_ALL"); |
| } |
| } |
| |
| public void reportUnlock(int userId) { |
| requireStrongAuth(STRONG_AUTH_NOT_REQUIRED, userId); |
| } |
| |
| public void reportSuccessfulStrongAuthUnlock(int userId) { |
| if (mBiometricManager != null) { |
| byte[] token = null; /* TODO: pass real auth token once HAL supports it */ |
| mBiometricManager.resetTimeout(token); |
| } |
| |
| final int argNotUsed = 0; |
| mHandler.obtainMessage(MSG_SCHEDULE_STRONG_AUTH_TIMEOUT, userId, argNotUsed).sendToTarget(); |
| } |
| |
| private class StrongAuthTimeoutAlarmListener implements OnAlarmListener { |
| |
| private final int mUserId; |
| |
| public StrongAuthTimeoutAlarmListener(int userId) { |
| mUserId = userId; |
| } |
| |
| @Override |
| public void onAlarm() { |
| requireStrongAuth(STRONG_AUTH_REQUIRED_AFTER_TIMEOUT, mUserId); |
| } |
| } |
| |
| private final Handler mHandler = new Handler() { |
| @Override |
| public void handleMessage(Message msg) { |
| switch (msg.what) { |
| case MSG_REGISTER_TRACKER: |
| handleAddStrongAuthTracker((IStrongAuthTracker) msg.obj); |
| break; |
| case MSG_UNREGISTER_TRACKER: |
| handleRemoveStrongAuthTracker((IStrongAuthTracker) msg.obj); |
| break; |
| case MSG_REQUIRE_STRONG_AUTH: |
| handleRequireStrongAuth(msg.arg1, msg.arg2); |
| break; |
| case MSG_REMOVE_USER: |
| handleRemoveUser(msg.arg1); |
| break; |
| case MSG_SCHEDULE_STRONG_AUTH_TIMEOUT: |
| handleScheduleStrongAuthTimeout(msg.arg1); |
| break; |
| } |
| } |
| }; |
| |
| } |