| /* |
| * Copyright (C) 2018 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.face; |
| |
| import static android.Manifest.permission.INTERACT_ACROSS_USERS; |
| import static android.Manifest.permission.MANAGE_FACE; |
| import static android.Manifest.permission.RESET_FACE_LOCKOUT; |
| import static android.Manifest.permission.USE_BIOMETRIC; |
| import static android.app.ActivityManager.RunningAppProcessInfo.IMPORTANCE_FOREGROUND; |
| |
| import android.app.ActivityManager; |
| import android.app.ActivityManager.RunningAppProcessInfo; |
| import android.app.AlarmManager; |
| import android.app.AppOpsManager; |
| import android.app.PendingIntent; |
| import android.app.SynchronousUserSwitchObserver; |
| import android.content.BroadcastReceiver; |
| import android.content.ComponentName; |
| import android.content.Context; |
| import android.content.Intent; |
| import android.content.IntentFilter; |
| import android.content.pm.PackageManager; |
| import android.content.pm.UserInfo; |
| import android.hardware.biometrics.face.V1_0.IBiometricsFace; |
| import android.hardware.biometrics.face.V1_0.IBiometricsFaceClientCallback; |
| import android.hardware.face.Face; |
| import android.hardware.face.FaceManager; |
| import android.hardware.face.IFaceService; |
| import android.hardware.face.IFaceServiceLockoutResetCallback; |
| import android.hardware.face.IFaceServiceReceiver; |
| import android.os.Binder; |
| import android.os.Bundle; |
| import android.os.DeadObjectException; |
| import android.os.Environment; |
| import android.os.Handler; |
| import android.os.IBinder; |
| import android.os.IHwBinder; |
| import android.os.IRemoteCallback; |
| import android.os.PowerManager; |
| import android.os.PowerManager.WakeLock; |
| import android.os.RemoteException; |
| import android.os.SELinux; |
| import android.os.SystemClock; |
| import android.os.UserHandle; |
| import android.os.UserManager; |
| import android.security.KeyStore; |
| import android.service.face.FaceActionStatsProto; |
| import android.service.face.FaceServiceDumpProto; |
| import android.service.face.FaceUserStatsProto; |
| import android.util.Slog; |
| import android.util.proto.ProtoOutputStream; |
| |
| import com.android.internal.annotations.GuardedBy; |
| import com.android.internal.logging.MetricsLogger; |
| import com.android.internal.util.DumpUtils; |
| import com.android.server.SystemServerInitThreadPool; |
| import com.android.server.SystemService; |
| |
| import org.json.JSONArray; |
| import org.json.JSONException; |
| import org.json.JSONObject; |
| |
| import java.io.File; |
| import java.io.FileDescriptor; |
| import java.io.PrintWriter; |
| import java.util.ArrayList; |
| import java.util.Collections; |
| import java.util.HashMap; |
| import java.util.List; |
| import java.util.Map; |
| |
| /** |
| * A service to manage multiple clients that want to access the face HAL API. |
| * The service is responsible for maintaining a list of clients and dispatching all |
| * face -related events. |
| * |
| * @hide |
| */ |
| public class FaceService extends SystemService implements IHwBinder.DeathRecipient { |
| static final String TAG = "FaceService"; |
| static final boolean DEBUG = true; |
| private static final String FACE_DATA_DIR = "facedata"; |
| private static final int MSG_USER_SWITCHING = 10; |
| private static final String ACTION_LOCKOUT_RESET = |
| "com.android.server.face.ACTION_LOCKOUT_RESET"; |
| |
| private class PerformanceStats { |
| int accept; // number of accepted faces |
| int reject; // number of rejected faces |
| int acquire; // total number of acquisitions. Should be >= accept+reject due to poor image |
| // acquisition in some cases (too high, too low, poor gaze, etc.) |
| int lockout; // total number of lockouts |
| int permanentLockout; // total number of permanent lockouts |
| } |
| |
| private final ArrayList<FaceServiceLockoutResetMonitor> mLockoutMonitors = |
| new ArrayList<>(); |
| private final Map<Integer, Long> mAuthenticatorIds = |
| Collections.synchronizedMap(new HashMap<>()); |
| private final AppOpsManager mAppOps; |
| private static final long FAIL_LOCKOUT_TIMEOUT_MS = 30*1000; |
| private static final int MAX_FAILED_ATTEMPTS_LOCKOUT_TIMED = 5; |
| private static final int MAX_FAILED_ATTEMPTS_LOCKOUT_PERMANENT = 20; |
| |
| private static final long CANCEL_TIMEOUT_LIMIT_MS = 3000; // max wait for onCancel() from HAL,in ms |
| private final String mKeyguardPackage; |
| private int mCurrentUserId = UserHandle.USER_NULL; |
| private final FaceUtils mFaceUtils = FaceUtils.getInstance(); |
| private Context mContext; |
| private long mHalDeviceId; |
| private boolean mTimedLockoutCleared; |
| private int mFailedAttempts; |
| @GuardedBy("this") |
| private IBiometricsFace mDaemon; |
| private final PowerManager mPowerManager; |
| private final AlarmManager mAlarmManager; |
| private final UserManager mUserManager; |
| private ClientMonitor mCurrentClient; |
| private ClientMonitor mPendingClient; |
| private PerformanceStats mPerformanceStats; |
| |
| |
| private IBinder mToken = new Binder(); // used for internal FaceService enumeration |
| |
| private class UserFace { |
| Face f; |
| int userId; |
| public UserFace(Face f, int userId) { |
| this.f = f; |
| this.userId = userId; |
| } |
| } |
| |
| // Normal face authentications are tracked by mPerformanceMap. |
| private HashMap<Integer, PerformanceStats> mPerformanceMap = new HashMap<>(); |
| |
| // Transactions that make use of CryptoObjects are tracked by mCryptoPerformaceMap. |
| private HashMap<Integer, PerformanceStats> mCryptoPerformanceMap = new HashMap<>(); |
| |
| private Handler mHandler = new Handler() { |
| @Override |
| public void handleMessage(android.os.Message msg) { |
| switch (msg.what) { |
| case MSG_USER_SWITCHING: |
| handleUserSwitching(msg.arg1); |
| break; |
| |
| default: |
| Slog.w(TAG, "Unknown message:" + msg.what); |
| } |
| } |
| }; |
| |
| private final BroadcastReceiver mLockoutReceiver = new BroadcastReceiver() { |
| @Override |
| public void onReceive(Context context, Intent intent) { |
| if (ACTION_LOCKOUT_RESET.equals(intent.getAction())) { |
| resetFailedAttempts(false /* clearAttemptCounter */); |
| } |
| } |
| }; |
| |
| private final Runnable mResetFailedAttemptsRunnable = new Runnable() { |
| @Override |
| public void run() { |
| resetFailedAttempts(true /* clearAttemptCounter */); |
| } |
| }; |
| |
| private final Runnable mResetClientState = new Runnable() { |
| @Override |
| public void run() { |
| // Warning: if we get here, the driver never confirmed our call to cancel the current |
| // operation (authenticate, enroll, remove, enumerate, etc), which is |
| // really bad. The result will be a 3-second delay in starting each new client. |
| // If you see this on a device, make certain the driver notifies with |
| // {@link FaceAuthenticationManager#FACE_ERROR_CANCEL} in response to cancel() |
| // once it has successfully switched to the IDLE state in the face HAL. |
| // Additionally,{@link FaceAuthenticationManager#FACE_ERROR_CANCEL} should only be sent |
| // in response to an actual cancel() call. |
| Slog.w(TAG, "Client " |
| + (mCurrentClient != null ? mCurrentClient.getOwnerString() : "null") |
| + " failed to respond to cancel, starting client " |
| + (mPendingClient != null ? mPendingClient.getOwnerString() : "null")); |
| |
| mCurrentClient = null; |
| startClient(mPendingClient, false); |
| } |
| }; |
| |
| public FaceService(Context context) { |
| super(context); |
| mContext = context; |
| mKeyguardPackage = ComponentName.unflattenFromString(context.getResources().getString( |
| com.android.internal.R.string.config_keyguardComponent)).getPackageName(); |
| mAppOps = context.getSystemService(AppOpsManager.class); |
| mPowerManager = mContext.getSystemService(PowerManager.class); |
| mAlarmManager = mContext.getSystemService(AlarmManager.class); |
| mContext.registerReceiver(mLockoutReceiver, new IntentFilter(ACTION_LOCKOUT_RESET), |
| RESET_FACE_LOCKOUT, null /* handler */); |
| mUserManager = UserManager.get(mContext); |
| } |
| |
| @Override |
| public void serviceDied(long cookie) { |
| Slog.v(TAG, "face HAL died"); |
| MetricsLogger.count(mContext, "faced_died", 1); |
| handleError(mHalDeviceId, FaceManager.FACE_ERROR_HW_UNAVAILABLE, |
| 0 /*vendorCode */); |
| } |
| |
| public synchronized IBiometricsFace getFaceDaemon() { |
| if (mDaemon == null) { |
| Slog.v(TAG, "mDaemon was null, reconnect to face"); |
| try { |
| mDaemon = IBiometricsFace.getService(); |
| } catch (java.util.NoSuchElementException e) { |
| // Service doesn't exist or cannot be opened. Logged below. |
| } catch (RemoteException e) { |
| Slog.e(TAG, "Failed to get biometric interface", e); |
| } |
| if (mDaemon == null) { |
| Slog.w(TAG, "face HIDL not available"); |
| return null; |
| } |
| |
| mDaemon.asBinder().linkToDeath(this, 0); |
| |
| try { |
| mHalDeviceId = mDaemon.setCallback(mDaemonCallback).value; |
| } catch (RemoteException e) { |
| Slog.e(TAG, "Failed to open face HAL", e); |
| mDaemon = null; // try again later! |
| } |
| |
| if (DEBUG) Slog.v(TAG, "face HAL id: " + mHalDeviceId); |
| if (mHalDeviceId != 0) { |
| loadAuthenticatorIds(); |
| updateActiveGroup(ActivityManager.getCurrentUser(), null); |
| } else { |
| Slog.w(TAG, "Failed to open Face HAL!"); |
| MetricsLogger.count(mContext, "faced_openhal_error", 1); |
| mDaemon = null; |
| } |
| } |
| return mDaemon; |
| } |
| |
| /** Populates existing authenticator ids. To be used only during the start of the service. */ |
| private void loadAuthenticatorIds() { |
| // This operation can be expensive, so keep track of the elapsed time. Might need to move to |
| // background if it takes too long. |
| long t = System.currentTimeMillis(); |
| mAuthenticatorIds.clear(); |
| for (UserInfo user : UserManager.get(mContext).getUsers(true /* excludeDying */)) { |
| int userId = getUserOrWorkProfileId(null, user.id); |
| if (!mAuthenticatorIds.containsKey(userId)) { |
| updateActiveGroup(userId, null); |
| } |
| } |
| |
| t = System.currentTimeMillis() - t; |
| if (t > 1000) { |
| Slog.w(TAG, "loadAuthenticatorIds() taking too long: " + t + "ms"); |
| } |
| } |
| |
| protected void handleError(long deviceId, int error, int vendorCode) { |
| ClientMonitor client = mCurrentClient; |
| if (client != null && client.onError(error, vendorCode)) { |
| removeClient(client); |
| } |
| |
| if (DEBUG) Slog.v(TAG, "handleError(client=" |
| + (client != null ? client.getOwnerString() : "null") + ", error = " + error + ")"); |
| // This is the magic code that starts the next client when the old client finishes. |
| if (error == FaceManager.FACE_ERROR_CANCELED) { |
| mHandler.removeCallbacks(mResetClientState); |
| if (mPendingClient != null) { |
| if (DEBUG) Slog.v(TAG, "start pending client " + mPendingClient.getOwnerString()); |
| startClient(mPendingClient, false); |
| mPendingClient = null; |
| } |
| } else if (error == FaceManager.FACE_ERROR_HW_UNAVAILABLE) { |
| // If we get HW_UNAVAILABLE, try to connect again later... |
| Slog.w(TAG, "Got ERROR_HW_UNAVAILABLE; try reconnecting next client."); |
| synchronized (this) { |
| mDaemon = null; |
| mHalDeviceId = 0; |
| mCurrentUserId = UserHandle.USER_NULL; |
| } |
| } |
| } |
| |
| protected void handleRemoved(long deviceId, int faceId, int userId, int remaining) { |
| if (DEBUG) Slog.w(TAG, "Removed: fid=" + faceId |
| + ", uid=" + userId |
| + ", dev=" + deviceId |
| + ", rem=" + remaining); |
| |
| ClientMonitor client = mCurrentClient; |
| if (client != null && client.onRemoved(faceId, remaining)) { |
| removeClient(client); |
| } |
| } |
| |
| protected void handleAuthenticated(long deviceId, int faceId, int userId, |
| ArrayList<Byte> token) { |
| ClientMonitor client = mCurrentClient; |
| if (faceId != 0) { |
| // Ugh... |
| final byte[] byteToken = new byte[token.size()]; |
| for (int i = 0; i < token.size(); i++) { |
| byteToken[i] = token.get(i); |
| } |
| // Send to Keystore |
| KeyStore.getInstance().addAuthToken(byteToken); |
| } |
| if (client != null && client.onAuthenticated(faceId)) { |
| removeClient(client); |
| } |
| if (faceId != 0) { |
| mPerformanceStats.accept++; |
| } else { |
| mPerformanceStats.reject++; |
| } |
| } |
| |
| protected void handleAcquired(long deviceId, int acquiredInfo, int vendorCode) { |
| ClientMonitor client = mCurrentClient; |
| if (client != null && client.onAcquired(acquiredInfo, vendorCode)) { |
| removeClient(client); |
| } |
| if (mPerformanceStats != null && getLockoutMode() == AuthenticationClient.LOCKOUT_NONE |
| && client instanceof AuthenticationClient) { |
| // ignore enrollment acquisitions or acquisitions when we're locked out |
| mPerformanceStats.acquire++; |
| } |
| } |
| |
| protected void handleEnrollResult(long deviceId, int faceId, int userId, int remaining) { |
| ClientMonitor client = mCurrentClient; |
| if (client != null && client.onEnrollResult(faceId, remaining)) { |
| removeClient(client); |
| } |
| } |
| |
| private void userActivity() { |
| long now = SystemClock.uptimeMillis(); |
| mPowerManager.userActivity(now, PowerManager.USER_ACTIVITY_EVENT_TOUCH, 0); |
| } |
| |
| void handleUserSwitching(int userId) { |
| updateActiveGroup(userId, null); |
| } |
| |
| private void removeClient(ClientMonitor client) { |
| if (client != null) { |
| client.destroy(); |
| if (client != mCurrentClient && mCurrentClient != null) { |
| Slog.w(TAG, "Unexpected client: " + client.getOwnerString() + "expected: " |
| + mCurrentClient != null ? mCurrentClient.getOwnerString() : "null"); |
| } |
| } |
| if (mCurrentClient != null) { |
| if (DEBUG) Slog.v(TAG, "Done with client: " + client.getOwnerString()); |
| mCurrentClient = null; |
| } |
| } |
| |
| private int getLockoutMode() { |
| if (mFailedAttempts >= MAX_FAILED_ATTEMPTS_LOCKOUT_PERMANENT) { |
| return AuthenticationClient.LOCKOUT_PERMANENT; |
| } else if (mFailedAttempts > 0 && mTimedLockoutCleared == false && |
| (mFailedAttempts % MAX_FAILED_ATTEMPTS_LOCKOUT_TIMED == 0)) { |
| return AuthenticationClient.LOCKOUT_TIMED; |
| } |
| return AuthenticationClient.LOCKOUT_NONE; |
| } |
| |
| private void scheduleLockoutReset() { |
| mAlarmManager.set(AlarmManager.ELAPSED_REALTIME_WAKEUP, |
| SystemClock.elapsedRealtime() + FAIL_LOCKOUT_TIMEOUT_MS, getLockoutResetIntent()); |
| } |
| |
| private void cancelLockoutReset() { |
| mAlarmManager.cancel(getLockoutResetIntent()); |
| } |
| |
| private PendingIntent getLockoutResetIntent() { |
| return PendingIntent.getBroadcast(mContext, 0, |
| new Intent(ACTION_LOCKOUT_RESET), PendingIntent.FLAG_UPDATE_CURRENT); |
| } |
| |
| public long startPreEnroll(IBinder token) { |
| IBiometricsFace daemon = getFaceDaemon(); |
| if (daemon == null) { |
| Slog.w(TAG, "startPreEnroll: no face HAL!"); |
| return 0; |
| } |
| try { |
| return daemon.preEnroll().value; |
| } catch (RemoteException e) { |
| Slog.e(TAG, "startPreEnroll failed", e); |
| } |
| return 0; |
| } |
| |
| public int startPostEnroll(IBinder token) { |
| IBiometricsFace daemon = getFaceDaemon(); |
| if (daemon == null) { |
| Slog.w(TAG, "startPostEnroll: no face HAL!"); |
| return 0; |
| } |
| try { |
| return daemon.postEnroll(); |
| } catch (RemoteException e) { |
| Slog.e(TAG, "startPostEnroll failed", e); |
| } |
| return 0; |
| } |
| |
| /** |
| * Calls face HAL to switch states to the new task. If there's already a current task, |
| * it calls cancel() and sets mPendingClient to begin when the current task finishes |
| * ({@link FaceManager#FACE_ERROR_CANCELED}). |
| * @param newClient the new client that wants to connect |
| * @param initiatedByClient true for authenticate, remove and enroll |
| */ |
| private void startClient(ClientMonitor newClient, boolean initiatedByClient) { |
| ClientMonitor currentClient = mCurrentClient; |
| if (currentClient != null) { |
| if (DEBUG) Slog.v(TAG, "request stop current client " + currentClient.getOwnerString()); |
| if (currentClient instanceof InternalRemovalClient) { |
| // This condition means we're currently running internal diagnostics to |
| // remove a face in the hardware and/or the software |
| // TODO: design an escape hatch in case client never finishes |
| } |
| else { |
| currentClient.stop(initiatedByClient); |
| } |
| mPendingClient = newClient; |
| mHandler.removeCallbacks(mResetClientState); |
| mHandler.postDelayed(mResetClientState, CANCEL_TIMEOUT_LIMIT_MS); |
| } else if (newClient != null) { |
| mCurrentClient = newClient; |
| if (DEBUG) Slog.v(TAG, "starting client " |
| + newClient.getClass().getSuperclass().getSimpleName() |
| + "(" + newClient.getOwnerString() + ")" |
| + ", initiatedByClient = " + initiatedByClient + ")"); |
| newClient.start(); |
| } |
| } |
| |
| void startRemove(IBinder token, int userId, IFaceServiceReceiver receiver, boolean restricted, |
| boolean internal) { |
| IBiometricsFace daemon = getFaceDaemon(); |
| if (daemon == null) { |
| Slog.w(TAG, "startRemove: no face HAL!"); |
| return; |
| } |
| |
| if (internal) { |
| Context context = getContext(); |
| InternalRemovalClient client = new InternalRemovalClient(context, mHalDeviceId, |
| token, receiver, userId, restricted, context.getOpPackageName()) { |
| @Override |
| public void notifyUserActivity() { |
| |
| } |
| @Override |
| public IBiometricsFace getFaceDaemon() { |
| return FaceService.this.getFaceDaemon(); |
| } |
| }; |
| startClient(client, true); |
| } |
| else { |
| RemovalClient client = new RemovalClient(getContext(), mHalDeviceId, token, |
| receiver, userId, restricted, token.toString()) { |
| @Override |
| public void notifyUserActivity() { |
| FaceService.this.userActivity(); |
| } |
| |
| @Override |
| public IBiometricsFace getFaceDaemon() { |
| return FaceService.this.getFaceDaemon(); |
| } |
| }; |
| startClient(client, true); |
| } |
| } |
| |
| /* |
| * @hide |
| */ |
| public Face getEnrolledFace(int userId) { |
| return mFaceUtils.getFaceForUser(mContext, userId); |
| } |
| |
| public boolean hasEnrolledFace(int userId) { |
| if (userId != UserHandle.getCallingUserId()) { |
| checkPermission(INTERACT_ACROSS_USERS); |
| } |
| return mFaceUtils.getFaceForUser(mContext, userId) != null; |
| } |
| |
| boolean hasPermission(String permission) { |
| return getContext().checkCallingOrSelfPermission(permission) |
| == PackageManager.PERMISSION_GRANTED; |
| } |
| |
| void checkPermission(String permission) { |
| getContext().enforceCallingOrSelfPermission(permission, |
| "Must have " + permission + " permission."); |
| } |
| |
| int getEffectiveUserId(int userId) { |
| UserManager um = UserManager.get(mContext); |
| if (um != null) { |
| final long callingIdentity = Binder.clearCallingIdentity(); |
| userId = um.getCredentialOwnerProfile(userId); |
| Binder.restoreCallingIdentity(callingIdentity); |
| } else { |
| Slog.e(TAG, "Unable to acquire UserManager"); |
| } |
| return userId; |
| } |
| |
| boolean isCurrentUserOrProfile(int userId) { |
| UserManager um = UserManager.get(mContext); |
| if (um == null) { |
| Slog.e(TAG, "Unable to acquire UserManager"); |
| return false; |
| } |
| |
| final long token = Binder.clearCallingIdentity(); |
| try { |
| // Allow current user or profiles of the current user... |
| for (int profileId : um.getEnabledProfileIds(ActivityManager.getCurrentUser())) { |
| if (profileId == userId) { |
| return true; |
| } |
| } |
| } finally { |
| Binder.restoreCallingIdentity(token); |
| } |
| |
| return false; |
| } |
| |
| private boolean isForegroundActivity(int uid, int pid) { |
| try { |
| List<RunningAppProcessInfo> procs = |
| ActivityManager.getService().getRunningAppProcesses(); |
| int N = procs.size(); |
| for (int i = 0; i < N; i++) { |
| RunningAppProcessInfo proc = procs.get(i); |
| if (proc.pid == pid && proc.uid == uid |
| && proc.importance == IMPORTANCE_FOREGROUND) { |
| return true; |
| } |
| } |
| } catch (RemoteException e) { |
| Slog.w(TAG, "am.getRunningAppProcesses() failed"); |
| } |
| return false; |
| } |
| |
| /** |
| * @param opPackageName name of package for caller |
| * @param requireForeground only allow this call while app is in the foreground |
| * @return true if caller can use face API |
| */ |
| private boolean canUseFace(String opPackageName, boolean requireForeground, int uid, |
| int pid, int userId) { |
| checkPermission(USE_BIOMETRIC); |
| if (isKeyguard(opPackageName)) { |
| return true; // Keyguard is always allowed |
| } |
| if (!isCurrentUserOrProfile(userId)) { |
| Slog.w(TAG,"Rejecting " + opPackageName + " ; not a current user or profile"); |
| return false; |
| } |
| if (mAppOps.noteOp(AppOpsManager.OP_USE_FACE, uid, opPackageName) |
| != AppOpsManager.MODE_ALLOWED) { |
| Slog.w(TAG, "Rejecting " + opPackageName + " ; permission denied"); |
| return false; |
| } |
| if (requireForeground && !(isForegroundActivity(uid, pid) || currentClient(opPackageName))){ |
| Slog.w(TAG, "Rejecting " + opPackageName + " ; not in foreground"); |
| return false; |
| } |
| return true; |
| } |
| |
| /** |
| * @param opPackageName package of the caller |
| * @return true if this is the same client currently using face |
| */ |
| private boolean currentClient(String opPackageName) { |
| return mCurrentClient != null && mCurrentClient.getOwnerString().equals(opPackageName); |
| } |
| |
| /** |
| * @param clientPackage |
| * @return true if this is keyguard package |
| */ |
| private boolean isKeyguard(String clientPackage) { |
| return mKeyguardPackage.equals(clientPackage); |
| } |
| |
| private void addLockoutResetMonitor(FaceServiceLockoutResetMonitor monitor) { |
| if (!mLockoutMonitors.contains(monitor)) { |
| mLockoutMonitors.add(monitor); |
| } |
| } |
| |
| private void removeLockoutResetCallback( |
| FaceServiceLockoutResetMonitor monitor) { |
| mLockoutMonitors.remove(monitor); |
| } |
| |
| private void notifyLockoutResetMonitors() { |
| for (int i = 0; i < mLockoutMonitors.size(); i++) { |
| mLockoutMonitors.get(i).sendLockoutReset(); |
| } |
| } |
| |
| private void startAuthentication(IBinder token, long opId, int callingUserId, |
| IFaceServiceReceiver receiver, int flags, boolean restricted, |
| String opPackageName) { |
| updateActiveGroup(callingUserId, opPackageName); |
| |
| if (DEBUG) Slog.v(TAG, "startAuthentication(" + opPackageName + ")"); |
| |
| AuthenticationClient client = new AuthenticationClient(getContext(), mHalDeviceId, token, |
| receiver, mCurrentUserId, opId, restricted, opPackageName) { |
| @Override |
| public int handleFailedAttempt() { |
| mFailedAttempts++; |
| mTimedLockoutCleared = false; |
| final int lockoutMode = getLockoutMode(); |
| if (lockoutMode == AuthenticationClient.LOCKOUT_PERMANENT) { |
| mPerformanceStats.permanentLockout++; |
| } else if (lockoutMode == AuthenticationClient.LOCKOUT_TIMED) { |
| mPerformanceStats.lockout++; |
| } |
| |
| // Failing multiple times will continue to push out the lockout time |
| if (lockoutMode != AuthenticationClient.LOCKOUT_NONE) { |
| scheduleLockoutReset(); |
| return lockoutMode; |
| } |
| return AuthenticationClient.LOCKOUT_NONE; |
| } |
| |
| @Override |
| public void resetFailedAttempts() { |
| FaceService.this.resetFailedAttempts(true /* clearAttemptCounter */); |
| } |
| |
| @Override |
| public void notifyUserActivity() { |
| FaceService.this.userActivity(); |
| } |
| |
| @Override |
| public IBiometricsFace getFaceDaemon() { |
| return FaceService.this.getFaceDaemon(); |
| } |
| }; |
| |
| int lockoutMode = getLockoutMode(); |
| if (lockoutMode != AuthenticationClient.LOCKOUT_NONE) { |
| Slog.v(TAG, "In lockout mode(" + lockoutMode + |
| ") ; disallowing authentication"); |
| int errorCode = lockoutMode == AuthenticationClient.LOCKOUT_TIMED ? |
| FaceManager.FACE_ERROR_LOCKOUT : |
| FaceManager.FACE_ERROR_LOCKOUT_PERMANENT; |
| if (!client.onError(errorCode, 0 /* vendorCode */)) { |
| Slog.w(TAG, "Cannot send permanent lockout message to client"); |
| } |
| return; |
| } |
| startClient(client, true /* initiatedByClient */); |
| } |
| |
| private void startEnrollment(IBinder token, byte [] cryptoToken, int userId, |
| IFaceServiceReceiver receiver, int flags, boolean restricted, |
| String opPackageName) { |
| updateActiveGroup(userId, opPackageName); |
| |
| EnrollClient client = new EnrollClient(getContext(), mHalDeviceId, token, receiver, |
| userId, cryptoToken, restricted, opPackageName) { |
| |
| @Override |
| public IBiometricsFace getFaceDaemon() { |
| return FaceService.this.getFaceDaemon(); |
| } |
| |
| @Override |
| public void notifyUserActivity() { |
| FaceService.this.userActivity(); |
| } |
| }; |
| startClient(client, true /* initiatedByClient */); |
| } |
| |
| // attempt counter should only be cleared when Keyguard goes away or when |
| // a face is successfully authenticated |
| protected void resetFailedAttempts(boolean clearAttemptCounter) { |
| if (DEBUG && getLockoutMode() != AuthenticationClient.LOCKOUT_NONE) { |
| Slog.v(TAG, "Reset face lockout, clearAttemptCounter=" + clearAttemptCounter); |
| } |
| if (clearAttemptCounter) { |
| mFailedAttempts = 0; |
| } |
| mTimedLockoutCleared = true; |
| // If we're asked to reset failed attempts externally (i.e. from Keyguard), |
| // the alarm might still be pending; remove it. |
| cancelLockoutReset(); |
| notifyLockoutResetMonitors(); |
| } |
| |
| private class FaceServiceLockoutResetMonitor { |
| |
| private static final long WAKELOCK_TIMEOUT_MS = 2000; |
| private final IFaceServiceLockoutResetCallback mCallback; |
| private final WakeLock mWakeLock; |
| |
| public FaceServiceLockoutResetMonitor( |
| IFaceServiceLockoutResetCallback callback) { |
| mCallback = callback; |
| mWakeLock = mPowerManager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, |
| "lockout reset callback"); |
| } |
| |
| public void sendLockoutReset() { |
| if (mCallback != null) { |
| try { |
| mWakeLock.acquire(WAKELOCK_TIMEOUT_MS); |
| mCallback.onLockoutReset(mHalDeviceId, new IRemoteCallback.Stub() { |
| |
| @Override |
| public void sendResult(Bundle data) throws RemoteException { |
| if (mWakeLock.isHeld()) { |
| mWakeLock.release(); |
| } |
| } |
| }); |
| } catch (DeadObjectException e) { |
| Slog.w(TAG, "Death object while invoking onLockoutReset: ", e); |
| mHandler.post(mRemoveCallbackRunnable); |
| } catch (RemoteException e) { |
| Slog.w(TAG, "Failed to invoke onLockoutReset: ", e); |
| } |
| } |
| } |
| |
| private final Runnable mRemoveCallbackRunnable = new Runnable() { |
| @Override |
| public void run() { |
| if (mWakeLock.isHeld()) { |
| mWakeLock.release(); |
| } |
| removeLockoutResetCallback(FaceServiceLockoutResetMonitor.this); |
| } |
| }; |
| } |
| |
| private IBiometricsFaceClientCallback mDaemonCallback = |
| new IBiometricsFaceClientCallback.Stub() { |
| |
| @Override |
| public void onEnrollResult(final long deviceId, int faceId, int userId, int remaining) { |
| mHandler.post(new Runnable() { |
| @Override |
| public void run() { |
| handleEnrollResult(deviceId, faceId, userId, remaining); |
| } |
| }); |
| } |
| |
| @Override |
| public void onAcquired(final long deviceId, final int userId, final int acquiredInfo, |
| final int vendorCode) { |
| mHandler.post(new Runnable() { |
| @Override |
| public void run() { |
| handleAcquired(deviceId, acquiredInfo, vendorCode); |
| } |
| }); |
| } |
| |
| @Override |
| public void onAuthenticated(final long deviceId, final int faceId, final int userId, |
| ArrayList<Byte> token) { |
| mHandler.post(new Runnable() { |
| @Override |
| public void run() { |
| handleAuthenticated(deviceId, faceId, userId, token); |
| } |
| }); |
| } |
| |
| @Override |
| public void onError(final long deviceId, final int userId, final int error, |
| final int vendorCode) { |
| mHandler.post(new Runnable() { |
| @Override |
| public void run() { |
| handleError(deviceId, error, vendorCode); |
| } |
| }); |
| } |
| |
| @Override |
| public void onRemoved(final long deviceId, final int faceId, final int userId, |
| final int remaining) { |
| mHandler.post(new Runnable() { |
| @Override |
| public void run() { |
| handleRemoved(deviceId, faceId, userId, remaining); |
| } |
| }); |
| } |
| |
| @Override |
| public void onEnumerate(long deviceId, ArrayList<Integer> faceIds, int userId) |
| throws RemoteException { |
| |
| } |
| }; |
| |
| private final class FaceServiceWrapper extends IFaceService.Stub { |
| @Override // Binder call |
| public long preEnroll(IBinder token) { |
| checkPermission(MANAGE_FACE); |
| return startPreEnroll(token); |
| } |
| |
| @Override // Binder call |
| public int postEnroll(IBinder token) { |
| checkPermission(MANAGE_FACE); |
| return startPostEnroll(token); |
| } |
| |
| @Override // Binder call |
| public void enroll(final IBinder token, final byte[] cryptoToken, final int userId, |
| final IFaceServiceReceiver receiver, final int flags, |
| final String opPackageName) { |
| checkPermission(MANAGE_FACE); |
| |
| Face enrolledFace = FaceService.this.getEnrolledFace(userId); |
| |
| if (enrolledFace != null) { |
| Slog.w(TAG, "Multiple faces enrollment is not supported"); |
| return; |
| } |
| |
| |
| final boolean restricted = isRestricted(); |
| mHandler.post(new Runnable() { |
| @Override |
| public void run() { |
| startEnrollment(token, cryptoToken, userId, receiver, flags, |
| restricted, opPackageName); |
| } |
| }); |
| } |
| |
| private boolean isRestricted() { |
| // Only give privileged apps (like Settings) access to faces info |
| final boolean restricted = !hasPermission(MANAGE_FACE); |
| return restricted; |
| } |
| |
| @Override // Binder call |
| public void cancelEnrollment(final IBinder token) { |
| checkPermission(MANAGE_FACE); |
| mHandler.post(new Runnable() { |
| @Override |
| public void run() { |
| ClientMonitor client = mCurrentClient; |
| if (client instanceof EnrollClient && client.getToken() == token) { |
| client.stop(client.getToken() == token); |
| } |
| } |
| }); |
| } |
| |
| @Override // Binder call |
| public void authenticate(final IBinder token, final long opId, |
| final IFaceServiceReceiver receiver, final int flags, |
| final String opPackageName) { |
| final int callingUid = Binder.getCallingUid(); |
| final int callingUserId = UserHandle.getCallingUserId(); |
| final int pid = Binder.getCallingPid(); |
| final boolean restricted = isRestricted(); |
| mHandler.post(new Runnable() { |
| @Override |
| public void run() { |
| if (!canUseFace(opPackageName, true /* foregroundOnly */, |
| callingUid, pid, callingUserId)) { |
| if (DEBUG) Slog.v(TAG, "authenticate(): reject " + opPackageName); |
| return; |
| } |
| |
| MetricsLogger.histogram(mContext, "faces_token", opId != 0L ? 1 : 0); |
| |
| // Get performance stats object for this user. |
| HashMap<Integer, PerformanceStats> pmap |
| = (opId == 0) ? mPerformanceMap : mCryptoPerformanceMap; |
| PerformanceStats stats = pmap.get(mCurrentUserId); |
| if (stats == null) { |
| stats = new PerformanceStats(); |
| pmap.put(mCurrentUserId, stats); |
| } |
| mPerformanceStats = stats; |
| |
| startAuthentication(token, opId, callingUserId, receiver, |
| flags, restricted, opPackageName); |
| } |
| }); |
| } |
| |
| @Override // Binder call |
| public void cancelAuthentication(final IBinder token, final String opPackageName) { |
| final int uid = Binder.getCallingUid(); |
| final int pid = Binder.getCallingPid(); |
| final int callingUserId = UserHandle.getCallingUserId(); |
| mHandler.post(new Runnable() { |
| @Override |
| public void run() { |
| if (!canUseFace(opPackageName, true /* foregroundOnly */, uid, pid, |
| callingUserId)) { |
| if (DEBUG) Slog.v(TAG, "cancelAuthentication(): reject " + opPackageName); |
| } else { |
| ClientMonitor client = mCurrentClient; |
| if (client instanceof AuthenticationClient) { |
| if (client.getToken() == token) { |
| if (DEBUG) Slog.v(TAG, "stop client " + client.getOwnerString()); |
| client.stop(client.getToken() == token); |
| } else { |
| if (DEBUG) Slog.v(TAG, "can't stop client " |
| + client.getOwnerString() + " since tokens don't match"); |
| } |
| } else if (client != null) { |
| if (DEBUG) Slog.v(TAG, "can't cancel non-authenticating client " |
| + client.getOwnerString()); |
| } |
| } |
| } |
| }); |
| } |
| |
| @Override // Binder call |
| public void setActiveUser(final int userId) { |
| checkPermission(MANAGE_FACE); |
| mHandler.post(new Runnable() { |
| @Override |
| public void run() { |
| updateActiveGroup(userId, null); |
| } |
| }); |
| } |
| |
| @Override // Binder call |
| public void remove(final IBinder token, final int userId, |
| final IFaceServiceReceiver receiver) { |
| checkPermission(MANAGE_FACE); // TODO: Maybe have another permission |
| final boolean restricted = isRestricted(); |
| mHandler.post(new Runnable() { |
| @Override |
| public void run() { |
| startRemove(token, userId, receiver, restricted, false /* internal */); |
| } |
| }); |
| } |
| |
| @Override // Binder call |
| public boolean isHardwareDetected(long deviceId, String opPackageName) { |
| if (!canUseFace(opPackageName, false /* foregroundOnly */, |
| Binder.getCallingUid(), Binder.getCallingPid(), |
| UserHandle.getCallingUserId())) { |
| return false; |
| } |
| |
| final long token = Binder.clearCallingIdentity(); |
| try { |
| IBiometricsFace daemon = getFaceDaemon(); |
| return daemon != null && mHalDeviceId != 0; |
| } finally { |
| Binder.restoreCallingIdentity(token); |
| } |
| } |
| |
| @Override // Binder call |
| public Face getEnrolledFace(int userId, String opPackageName) { |
| if (!canUseFace(opPackageName, false /* foregroundOnly */, |
| Binder.getCallingUid(), Binder.getCallingPid(), |
| UserHandle.getCallingUserId())) { |
| return null; |
| } |
| |
| return FaceService.this.getEnrolledFace(userId); |
| } |
| |
| @Override // Binder call |
| public boolean hasEnrolledFace(int userId, String opPackageName) { |
| if (!canUseFace(opPackageName, false /* foregroundOnly */, |
| Binder.getCallingUid(), Binder.getCallingPid(), |
| UserHandle.getCallingUserId())) { |
| return false; |
| } |
| |
| return FaceService.this.hasEnrolledFace(userId); |
| } |
| |
| @Override // Binder call |
| public long getAuthenticatorId(String opPackageName) { |
| // In this method, we're not checking whether the caller is permitted to use face |
| // API because current authenticator ID is leaked (in a more contrived way) via Android |
| // Keystore (android.security.keystore package): the user of that API can create a key |
| // which requires face authentication for its use, and then query the key's |
| // characteristics (hidden API) which returns, among other things, face |
| // authenticator ID which was active at key creation time. |
| // |
| // Reason: The part of Android Keystore which runs inside an app's process invokes this |
| // method in certain cases. Those cases are not always where the developer demonstrates |
| // explicit intent to use face functionality. Thus, to avoiding throwing an |
| // unexpected SecurityException this method does not check whether its caller is |
| // permitted to use face API. |
| // |
| // The permission check should be restored once Android Keystore no longer invokes this |
| // method from inside app processes. |
| |
| return FaceService.this.getAuthenticatorId(opPackageName); |
| } |
| |
| @Override // Binder call |
| protected void dump(FileDescriptor fd, PrintWriter pw, String[] args) { |
| if (!DumpUtils.checkDumpPermission(mContext, TAG, pw)) return; |
| |
| final long ident = Binder.clearCallingIdentity(); |
| try { |
| if (args.length > 0 && "--proto".equals(args[0])) { |
| dumpProto(fd); |
| } else { |
| dumpInternal(pw); |
| } |
| } finally { |
| Binder.restoreCallingIdentity(ident); |
| } |
| } |
| |
| @Override // Binder call |
| public void resetTimeout(byte [] token) { |
| checkPermission(RESET_FACE_LOCKOUT); |
| // TODO: confirm security token when we move timeout management into the HAL layer. |
| mHandler.post(mResetFailedAttemptsRunnable); |
| } |
| |
| @Override |
| public void addLockoutResetCallback(final IFaceServiceLockoutResetCallback callback) |
| throws RemoteException { |
| mHandler.post(new Runnable() { |
| @Override |
| public void run() { |
| addLockoutResetMonitor( |
| new FaceServiceLockoutResetMonitor(callback)); |
| } |
| }); |
| } |
| } |
| |
| private void dumpInternal(PrintWriter pw) { |
| JSONObject dump = new JSONObject(); |
| try { |
| dump.put("service", "Face Manager"); |
| |
| JSONArray sets = new JSONArray(); |
| for (UserInfo user : UserManager.get(getContext()).getUsers()) { |
| final int userId = user.getUserHandle().getIdentifier(); |
| PerformanceStats stats = mPerformanceMap.get(userId); |
| PerformanceStats cryptoStats = mCryptoPerformanceMap.get(userId); |
| JSONObject set = new JSONObject(); |
| set.put("id", userId); |
| set.put("accept", (stats != null) ? stats.accept : 0); |
| set.put("reject", (stats != null) ? stats.reject : 0); |
| set.put("acquire", (stats != null) ? stats.acquire : 0); |
| set.put("lockout", (stats != null) ? stats.lockout : 0); |
| set.put("permanentLockout", (stats != null) ? stats.permanentLockout : 0); |
| // cryptoStats measures statistics about secure face transactions |
| // (e.g. to unlock password storage, make secure purchases, etc.) |
| set.put("acceptCrypto", (cryptoStats != null) ? cryptoStats.accept : 0); |
| set.put("rejectCrypto", (cryptoStats != null) ? cryptoStats.reject : 0); |
| set.put("acquireCrypto", (cryptoStats != null) ? cryptoStats.acquire : 0); |
| set.put("lockoutCrypto", (cryptoStats != null) ? cryptoStats.lockout : 0); |
| sets.put(set); |
| } |
| |
| dump.put("prints", sets); |
| } catch (JSONException e) { |
| Slog.e(TAG, "dump formatting failure", e); |
| } |
| pw.println(dump); |
| } |
| |
| private void dumpProto(FileDescriptor fd) { |
| final ProtoOutputStream proto = new ProtoOutputStream(fd); |
| for (UserInfo user : UserManager.get(getContext()).getUsers()) { |
| final int userId = user.getUserHandle().getIdentifier(); |
| |
| final long userToken = proto.start(FaceServiceDumpProto.USERS); |
| |
| proto.write(FaceUserStatsProto.USER_ID, userId); |
| |
| // Normal face authentications (e.g. lockscreen) |
| final PerformanceStats normal = mPerformanceMap.get(userId); |
| if (normal != null) { |
| final long countsToken = proto.start(FaceUserStatsProto.NORMAL); |
| proto.write(FaceActionStatsProto.ACCEPT, normal.accept); |
| proto.write(FaceActionStatsProto.REJECT, normal.reject); |
| proto.write(FaceActionStatsProto.ACQUIRE, normal.acquire); |
| proto.write(FaceActionStatsProto.LOCKOUT, normal.lockout); |
| proto.write(FaceActionStatsProto.LOCKOUT_PERMANENT, normal.lockout); |
| proto.end(countsToken); |
| } |
| |
| // Statistics about secure face transactions (e.g. to unlock password |
| // storage, make secure purchases, etc.) |
| final PerformanceStats crypto = mCryptoPerformanceMap.get(userId); |
| if (crypto != null) { |
| final long countsToken = proto.start(FaceUserStatsProto.CRYPTO); |
| proto.write(FaceActionStatsProto.ACCEPT, crypto.accept); |
| proto.write(FaceActionStatsProto.REJECT, crypto.reject); |
| proto.write(FaceActionStatsProto.ACQUIRE, crypto.acquire); |
| proto.write(FaceActionStatsProto.LOCKOUT, crypto.lockout); |
| proto.write(FaceActionStatsProto.LOCKOUT_PERMANENT, crypto.lockout); |
| proto.end(countsToken); |
| } |
| |
| proto.end(userToken); |
| } |
| proto.flush(); |
| } |
| |
| @Override |
| public void onStart() { |
| publishBinderService(Context.FACE_SERVICE, new FaceServiceWrapper()); |
| SystemServerInitThreadPool.get().submit(this::getFaceDaemon, TAG + ".onStart"); |
| listenForUserSwitches(); |
| } |
| |
| private void updateActiveGroup(int userId, String clientPackage) { |
| IBiometricsFace daemon = getFaceDaemon(); |
| |
| if (daemon != null) { |
| try { |
| userId = getUserOrWorkProfileId(clientPackage, userId); |
| if (userId != mCurrentUserId) { |
| final File systemDir = Environment.getUserSystemDirectory(userId); |
| final File faceDir = new File(systemDir, FACE_DATA_DIR); |
| if (!faceDir.exists()) { |
| if (!faceDir.mkdir()) { |
| Slog.v(TAG, "Cannot make directory: " + faceDir.getAbsolutePath()); |
| return; |
| } |
| // Calling mkdir() from this process will create a directory with our |
| // permissions (inherited from the containing dir). This command fixes |
| // the label. |
| if (!SELinux.restorecon(faceDir)) { |
| Slog.w(TAG, "Restorecons failed. Directory will have wrong label."); |
| return; |
| } |
| } |
| daemon.setActiveUser(userId, faceDir.getAbsolutePath()); |
| mCurrentUserId = userId; |
| } |
| mAuthenticatorIds.put(userId, |
| hasEnrolledFace(userId) ? daemon.getAuthenticatorId().value : 0L); |
| } catch (RemoteException e) { |
| Slog.e(TAG, "Failed to setActiveUser():", e); |
| } |
| } |
| } |
| |
| /** |
| * @param clientPackage the package of the caller |
| * @return the profile id |
| */ |
| private int getUserOrWorkProfileId(String clientPackage, int userId) { |
| if (!isKeyguard(clientPackage) && isWorkProfile(userId)) { |
| return userId; |
| } |
| return getEffectiveUserId(userId); |
| } |
| |
| /** |
| * @param userId |
| * @return true if this is a work profile |
| */ |
| private boolean isWorkProfile(int userId) { |
| UserInfo userInfo = null; |
| final long token = Binder.clearCallingIdentity(); |
| try { |
| userInfo = mUserManager.getUserInfo(userId); |
| } finally { |
| Binder.restoreCallingIdentity(token); |
| } |
| return userInfo != null && userInfo.isManagedProfile(); |
| } |
| |
| private void listenForUserSwitches() { |
| try { |
| ActivityManager.getService().registerUserSwitchObserver( |
| new SynchronousUserSwitchObserver() { |
| @Override |
| public void onUserSwitching(int newUserId) throws RemoteException { |
| mHandler.obtainMessage(MSG_USER_SWITCHING, newUserId, 0 /* unused */) |
| .sendToTarget(); |
| } |
| }, TAG); |
| } catch (RemoteException e) { |
| Slog.w(TAG, "Failed to listen for user switching event" ,e); |
| } |
| } |
| |
| /*** |
| * @param opPackageName the name of the calling package |
| * @return authenticator id for the calling user |
| */ |
| public long getAuthenticatorId(String opPackageName) { |
| final int userId = getUserOrWorkProfileId(opPackageName, UserHandle.getCallingUserId()); |
| return mAuthenticatorIds.getOrDefault(userId, 0L); |
| } |
| } |