/**
* Copyright (C) 2014 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.fingerprint;
import android.app.ActivityManager;
import android.app.ActivityManagerNative;
import android.app.AppOpsManager;
import android.app.IUserSwitchObserver;
import android.content.ContentResolver;
import android.content.Context;
import android.content.pm.PackageManager;
import android.content.pm.UserInfo;
import android.os.Binder;
import android.os.Environment;
import android.os.Handler;
import android.os.IBinder;
import android.os.IRemoteCallback;
import android.os.Looper;
import android.os.MessageQueue;
import android.os.PowerManager;
import android.os.RemoteException;
import android.os.SELinux;
import android.os.ServiceManager;
import android.os.SystemClock;
import android.os.UserHandle;
import android.os.UserManager;
import android.util.Slog;
import com.android.server.SystemService;
import android.hardware.fingerprint.Fingerprint;
import android.hardware.fingerprint.FingerprintManager;
import android.hardware.fingerprint.IFingerprintService;
import android.hardware.fingerprint.IFingerprintDaemon;
import android.hardware.fingerprint.IFingerprintDaemonCallback;
import android.hardware.fingerprint.IFingerprintServiceReceiver;
import static android.Manifest.permission.MANAGE_FINGERPRINT;
import static android.Manifest.permission.USE_FINGERPRINT;
import java.io.File;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.NoSuchElementException;
/**
* A service to manage multiple clients that want to access the fingerprint HAL API.
* The service is responsible for maintaining a list of clients and dispatching all
* fingerprint -related events.
*
* @hide
*/
public class FingerprintService extends SystemService implements IBinder.DeathRecipient {
private static final String TAG = "FingerprintService";
private static final boolean DEBUG = true;
private static final String FP_DATA_DIR = "fpdata";
private static final String FINGERPRINTD = "android.hardware.fingerprint.IFingerprintDaemon";
private static final int MSG_USER_SWITCHING = 10;
private static final int ENROLLMENT_TIMEOUT_MS = 60 * 1000; // 1 minute
private ClientMonitor mAuthClient = null;
private ClientMonitor mEnrollClient = null;
private ClientMonitor mRemoveClient = null;
private final AppOpsManager mAppOps;
private static final long MS_PER_SEC = 1000;
private static final long FAIL_LOCKOUT_TIMEOUT_MS = 30*1000;
private static final int MAX_FAILED_ATTEMPTS = 5;
private static final int FINGERPRINT_ACQUIRED_GOOD = 0;
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 FingerprintUtils mFingerprintUtils = FingerprintUtils.getInstance();
private Context mContext;
private long mHalDeviceId;
private int mFailedAttempts;
private IFingerprintDaemon mDaemon;
private PowerManager mPowerManager;
private final Runnable mLockoutReset = new Runnable() {
@Override
public void run() {
resetFailedAttempts();
}
};
public FingerprintService(Context context) {
super(context);
mContext = context;
mAppOps = context.getSystemService(AppOpsManager.class);
mPowerManager = (PowerManager) mContext.getSystemService(Context.POWER_SERVICE);
}
@Override
public void binderDied() {
Slog.v(TAG, "fingerprintd died");
mDaemon = null;
dispatchError(mHalDeviceId, FingerprintManager.FINGERPRINT_ERROR_HW_UNAVAILABLE);
}
public IFingerprintDaemon getFingerprintDaemon() {
if (mDaemon == null) {
mDaemon = IFingerprintDaemon.Stub.asInterface(ServiceManager.getService(FINGERPRINTD));
if (mDaemon != null) {
try {
mDaemon.asBinder().linkToDeath(this, 0);
mDaemon.init(mDaemonCallback);
mHalDeviceId = mDaemon.openHal();
if (mHalDeviceId != 0) {
updateActiveGroup(ActivityManager.getCurrentUser());
} else {
Slog.w(TAG, "Failed to open Fingerprint HAL!");
mDaemon = null;
}
} catch (RemoteException e) {
Slog.e(TAG, "Failed to open fingeprintd HAL", e);
mDaemon = null; // try again later!
}
} else {
Slog.w(TAG, "fingerprint service not available");
}
}
return mDaemon;
}
protected void dispatchEnumerate(long deviceId, int[] fingerIds, int[] groupIds) {
if (fingerIds.length != groupIds.length) {
Slog.w(TAG, "fingerIds and groupIds differ in length: f[]="
+ fingerIds + ", g[]=" + groupIds);
return;
}
if (DEBUG) Slog.w(TAG, "Enumerate: f[]=" + fingerIds + ", g[]=" + groupIds);
// TODO: update fingerprint/name pairs
}
protected void dispatchRemoved(long deviceId, int fingerId, int groupId) {
final ClientMonitor client = mRemoveClient;
if (fingerId != 0) {
removeTemplateForUser(mRemoveClient, fingerId);
}
if (client != null && client.sendRemoved(fingerId, groupId)) {
removeClient(mRemoveClient);
}
}
protected void dispatchError(long deviceId, int error) {
if (mEnrollClient != null) {
final IBinder token = mEnrollClient.token;
if (mEnrollClient.sendError(error)) {
stopEnrollment(token, false);
}
} else if (mAuthClient != null) {
final IBinder token = mAuthClient.token;
if (mAuthClient.sendError(error)) {
stopAuthentication(token, false);
}
} else if (mRemoveClient != null) {
if (mRemoveClient.sendError(error)) removeClient(mRemoveClient);
}
}
protected void dispatchAuthenticated(long deviceId, int fingerId, int groupId) {
if (mAuthClient != null) {
final IBinder token = mAuthClient.token;
if (mAuthClient.sendAuthenticated(fingerId, groupId)) {
stopAuthentication(token, false);
removeClient(mAuthClient);
}
}
}
protected void dispatchAcquired(long deviceId, int acquiredInfo) {
if (mEnrollClient != null) {
if (mEnrollClient.sendAcquired(acquiredInfo)) {
removeClient(mEnrollClient);
}
} else if (mAuthClient != null) {
if (mAuthClient.sendAcquired(acquiredInfo)) {
removeClient(mAuthClient);
}
}
}
private void userActivity() {
long now = SystemClock.uptimeMillis();
mPowerManager.userActivity(now, PowerManager.USER_ACTIVITY_EVENT_TOUCH, 0);
}
void handleUserSwitching(int userId) {
updateActiveGroup(userId);
}
protected void dispatchEnrollResult(long deviceId, int fingerId, int groupId, int remaining) {
if (mEnrollClient != null) {
if (mEnrollClient.sendEnrollResult(fingerId, groupId, remaining)) {
if (remaining == 0) {
addTemplateForUser(mEnrollClient, fingerId);
removeClient(mEnrollClient);
}
}
}
}
private void removeClient(ClientMonitor client) {
if (client == null) return;
client.destroy();
if (client == mAuthClient) {
mAuthClient = null;
} else if (client == mEnrollClient) {
mEnrollClient = null;
} else if (client == mRemoveClient) {
mRemoveClient = null;
}
}
private boolean inLockoutMode() {
return mFailedAttempts > MAX_FAILED_ATTEMPTS;
}
private void resetFailedAttempts() {
if (DEBUG && inLockoutMode()) {
Slog.v(TAG, "Reset fingerprint lockout");
}
mFailedAttempts = 0;
}
private boolean handleFailedAttempt(ClientMonitor clientMonitor) {
mFailedAttempts++;
if (mFailedAttempts > MAX_FAILED_ATTEMPTS) {
// Failing multiple times will continue to push out the lockout time.
mHandler.removeCallbacks(mLockoutReset);
mHandler.postDelayed(mLockoutReset, FAIL_LOCKOUT_TIMEOUT_MS);
if (clientMonitor != null
&& !clientMonitor.sendError(FingerprintManager.FINGERPRINT_ERROR_LOCKOUT)) {
Slog.w(TAG, "Cannot send lockout message to client");
}
return true;
}
return false;
}
private void removeTemplateForUser(ClientMonitor clientMonitor, int fingerId) {
mFingerprintUtils.removeFingerprintIdForUser(mContext, fingerId, clientMonitor.userId);
}
private void addTemplateForUser(ClientMonitor clientMonitor, int fingerId) {
mFingerprintUtils.addFingerprintForUser(mContext, fingerId, clientMonitor.userId);
}
void startEnrollment(IBinder token, byte[] cryptoToken, int groupId,
IFingerprintServiceReceiver receiver, int flags, boolean restricted) {
IFingerprintDaemon daemon = getFingerprintDaemon();
if (daemon == null) {
Slog.w(TAG, "enroll: no fingeprintd!");
return;
}
stopPendingOperations(true);
mEnrollClient = new ClientMonitor(token, receiver, groupId, restricted);
final int timeout = (int) (ENROLLMENT_TIMEOUT_MS / MS_PER_SEC);
try {
final int result = daemon.enroll(cryptoToken, groupId, timeout);
if (result != 0) {
Slog.w(TAG, "startEnroll failed, result=" + result);
}
} catch (RemoteException e) {
Slog.e(TAG, "startEnroll failed", e);
}
}
public long startPreEnroll(IBinder token) {
IFingerprintDaemon daemon = getFingerprintDaemon();
if (daemon == null) {
Slog.w(TAG, "startPreEnroll: no fingeprintd!");
return 0;
}
try {
return daemon.preEnroll();
} catch (RemoteException e) {
Slog.e(TAG, "startPreEnroll failed", e);
}
return 0;
}
public int startPostEnroll(IBinder token) {
IFingerprintDaemon daemon = getFingerprintDaemon();
if (daemon == null) {
Slog.w(TAG, "startPostEnroll: no fingeprintd!");
return 0;
}
try {
return daemon.postEnroll();
} catch (RemoteException e) {
Slog.e(TAG, "startPostEnroll failed", e);
}
return 0;
}
private void stopPendingOperations(boolean initiatedByClient) {
if (mEnrollClient != null) {
stopEnrollment(mEnrollClient.token, initiatedByClient);
}
if (mAuthClient != null) {
stopAuthentication(mAuthClient.token, initiatedByClient);
}
// mRemoveClient is allowed to continue
}
/**
* Stop enrollment in progress and inform client if they initiated it.
*
* @param token token for client
* @param initiatedByClient if this call is the result of client action (e.g. calling cancel)
*/
void stopEnrollment(IBinder token, boolean initiatedByClient) {
IFingerprintDaemon daemon = getFingerprintDaemon();
if (daemon == null) {
Slog.w(TAG, "stopEnrollment: no fingeprintd!");
return;
}
final ClientMonitor client = mEnrollClient;
if (client == null || client.token != token) return;
if (initiatedByClient) {
try {
int result = daemon.cancelEnrollment();
if (result != 0) {
Slog.w(TAG, "startEnrollCancel failed, result = " + result);
}
} catch (RemoteException e) {
Slog.e(TAG, "stopEnrollment failed", e);
}
client.sendError(FingerprintManager.FINGERPRINT_ERROR_CANCELED);
}
removeClient(mEnrollClient);
}
void startAuthentication(IBinder token, long opId, int groupId,
IFingerprintServiceReceiver receiver, int flags, boolean restricted) {
IFingerprintDaemon daemon = getFingerprintDaemon();
if (daemon == null) {
Slog.w(TAG, "startAuthentication: no fingeprintd!");
return;
}
stopPendingOperations(true);
mAuthClient = new ClientMonitor(token, receiver, groupId, restricted);
if (inLockoutMode()) {
Slog.v(TAG, "In lockout mode; disallowing authentication");
if (!mAuthClient.sendError(FingerprintManager.FINGERPRINT_ERROR_LOCKOUT)) {
Slog.w(TAG, "Cannot send timeout message to client");
}
mAuthClient = null;
return;
}
try {
final int result = daemon.authenticate(opId, groupId);
if (result != 0) {
Slog.w(TAG, "startAuthentication failed, result=" + result);
}
} catch (RemoteException e) {
Slog.e(TAG, "startAuthentication failed", e);
}
}
/**
* Stop authentication in progress and inform client if they initiated it.
*
* @param token token for client
* @param initiatedByClient if this call is the result of client action (e.g. calling cancel)
*/
void stopAuthentication(IBinder token, boolean initiatedByClient) {
IFingerprintDaemon daemon = getFingerprintDaemon();
if (daemon == null) {
Slog.w(TAG, "stopAuthentication: no fingeprintd!");
return;
}
final ClientMonitor client = mAuthClient;
if (client == null || client.token != token) return;
if (initiatedByClient) {
try {
int result = daemon.cancelAuthentication();
if (result != 0) {
Slog.w(TAG, "stopAuthentication failed, result=" + result);
}
} catch (RemoteException e) {
Slog.e(TAG, "stopAuthentication failed", e);
}
client.sendError(FingerprintManager.FINGERPRINT_ERROR_CANCELED);
}
removeClient(mAuthClient);
}
void startRemove(IBinder token, int fingerId, int userId,
IFingerprintServiceReceiver receiver, boolean restricted) {
IFingerprintDaemon daemon = getFingerprintDaemon();
if (daemon == null) {
Slog.w(TAG, "startRemove: no fingeprintd!");
return;
}
mRemoveClient = new ClientMonitor(token, receiver, userId, restricted);
// The fingerprint template ids will be removed when we get confirmation from the HAL
try {
final int result = daemon.remove(fingerId, userId);
if (result != 0) {
Slog.w(TAG, "startRemove with id = " + fingerId + " failed, result=" + result);
}
} catch (RemoteException e) {
Slog.e(TAG, "startRemove failed", e);
}
}
public List<Fingerprint> getEnrolledFingerprints(int userId) {
return mFingerprintUtils.getFingerprintsForUser(mContext, userId);
}
public boolean hasEnrolledFingerprints(int userId) {
return mFingerprintUtils.getFingerprintsForUser(mContext, userId).size() > 0;
}
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);
// Allow current user or profiles of the current user...
List<UserInfo> profiles = um.getEnabledProfiles(userId);
final int n = profiles.size();
for (int i = 0; i < n; i++) {
if (profiles.get(i).id == userId) {
return true;
}
}
return false;
}
private boolean canUseFingerprint(String opPackageName) {
checkPermission(USE_FINGERPRINT);
return mAppOps.noteOp(AppOpsManager.OP_USE_FINGERPRINT, Binder.getCallingUid(),
opPackageName) == AppOpsManager.MODE_ALLOWED;
}
private class ClientMonitor implements IBinder.DeathRecipient {
IBinder token;
IFingerprintServiceReceiver receiver;
int userId;
boolean restricted; // True if client does not have MANAGE_FINGERPRINT permission
public ClientMonitor(IBinder token, IFingerprintServiceReceiver receiver, int userId,
boolean restricted) {
this.token = token;
this.receiver = receiver;
this.userId = userId;
this.restricted = restricted;
try {
token.linkToDeath(this, 0);
} catch (RemoteException e) {
Slog.w(TAG, "caught remote exception in linkToDeath: ", e);
}
}
public void destroy() {
if (token != null) {
try {
token.unlinkToDeath(this, 0);
} catch (NoSuchElementException e) {
// TODO: remove when duplicate call bug is found
Slog.e(TAG, "destroy(): " + this + ":", new Exception("here"));
}
token = null;
}
receiver = null;
}
@Override
public void binderDied() {
token = null;
removeClient(this);
receiver = null;
}
@Override
protected void finalize() throws Throwable {
try {
if (token != null) {
if (DEBUG) Slog.w(TAG, "removing leaked reference: " + token);
removeClient(this);
}
} finally {
super.finalize();
}
}
/*
* @return true if we're done.
*/
private boolean sendRemoved(int fingerId, int groupId) {
if (receiver == null) return true; // client not listening
try {
receiver.onRemoved(mHalDeviceId, fingerId, groupId);
return fingerId == 0;
} catch (RemoteException e) {
Slog.w(TAG, "Failed to notify Removed:", e);
}
return false;
}
/*
* @return true if we're done.
*/
private boolean sendEnrollResult(int fpId, int groupId, int remaining) {
if (receiver == null) return true; // client not listening
FingerprintUtils.vibrateFingerprintSuccess(getContext());
try {
receiver.onEnrollResult(mHalDeviceId, fpId, groupId, remaining);
return remaining == 0;
} catch (RemoteException e) {
Slog.w(TAG, "Failed to notify EnrollResult:", e);
return true;
}
}
/*
* @return true if we're done.
*/
private boolean sendAuthenticated(int fpId, int groupId) {
boolean result = false;
boolean authenticated = fpId != 0;
if (receiver != null) {
try {
if (!authenticated) {
receiver.onAuthenticationFailed(mHalDeviceId);
} else {
Fingerprint fp = !restricted ?
new Fingerprint("" /* TODO */, groupId, fpId, mHalDeviceId) : null;
receiver.onAuthenticationSucceeded(mHalDeviceId, fp);
}
} catch (RemoteException e) {
Slog.w(TAG, "Failed to notify Authenticated:", e);
result = true; // client failed
}
} else {
result = true; // client not listening
}
if (fpId == 0) {
FingerprintUtils.vibrateFingerprintError(getContext());
result |= handleFailedAttempt(this);
} else {
FingerprintUtils.vibrateFingerprintSuccess(getContext());
result |= true; // we have a valid fingerprint
mLockoutReset.run();
}
return result;
}
/*
* @return true if we're done.
*/
private boolean sendAcquired(int acquiredInfo) {
if (receiver == null) return true; // client not listening
try {
receiver.onAcquired(mHalDeviceId, acquiredInfo);
return false; // acquisition continues...
} catch (RemoteException e) {
Slog.w(TAG, "Failed to invoke sendAcquired:", e);
return true; // client failed
}
finally {
// Good scans will keep the device awake
if (acquiredInfo == FINGERPRINT_ACQUIRED_GOOD) {
userActivity();
}
}
}
/*
* @return true if we're done.
*/
private boolean sendError(int error) {
if (receiver != null) {
try {
receiver.onError(mHalDeviceId, error);
} catch (RemoteException e) {
Slog.w(TAG, "Failed to invoke sendError:", e);
}
}
return true; // errors always terminate progress
}
}
private IFingerprintDaemonCallback mDaemonCallback = new IFingerprintDaemonCallback.Stub() {
@Override
public void onEnrollResult(long deviceId, int fingerId, int groupId, int remaining) {
dispatchEnrollResult(deviceId, fingerId, groupId, remaining);
}
@Override
public void onAcquired(long deviceId, int acquiredInfo) {
dispatchAcquired(deviceId, acquiredInfo);
}
@Override
public void onAuthenticated(long deviceId, int fingerId, int groupId) {
dispatchAuthenticated(deviceId, fingerId, groupId);
}
@Override
public void onError(long deviceId, int error) {
dispatchError(deviceId, error);
}
@Override
public void onRemoved(long deviceId, int fingerId, int groupId) {
dispatchRemoved(deviceId, fingerId, groupId);
}
@Override
public void onEnumerate(long deviceId, int[] fingerIds, int[] groupIds) {
dispatchEnumerate(deviceId, fingerIds, groupIds);
}
};
private final class FingerprintServiceWrapper extends IFingerprintService.Stub {
private static final String KEYGUARD_PACKAGE = "com.android.systemui";
@Override // Binder call
public long preEnroll(IBinder token) {
checkPermission(MANAGE_FINGERPRINT);
return startPreEnroll(token);
}
@Override // Binder call
public int postEnroll(IBinder token) {
checkPermission(MANAGE_FINGERPRINT);
return startPostEnroll(token);
}
@Override // Binder call
public void enroll(final IBinder token, final byte[] cryptoToken, final int groupId,
final IFingerprintServiceReceiver receiver, final int flags) {
checkPermission(MANAGE_FINGERPRINT);
final int limit = mContext.getResources().getInteger(
com.android.internal.R.integer.config_fingerprintMaxTemplatesPerUser);
final int callingUid = Binder.getCallingUid();
final int userId = UserHandle.getUserId(callingUid);
final int enrolled = FingerprintService.this.getEnrolledFingerprints(userId).size();
if (enrolled >= limit) {
Slog.w(TAG, "Too many fingerprints registered");
return;
}
final byte [] cryptoClone = Arrays.copyOf(cryptoToken, cryptoToken.length);
// Group ID is arbitrarily set to parent profile user ID. It just represents
// the default fingerprints for the user.
final int effectiveGroupId = getEffectiveUserId(groupId);
final boolean restricted = isRestricted();
mHandler.post(new Runnable() {
@Override
public void run() {
startEnrollment(token, cryptoClone, effectiveGroupId, receiver, flags, restricted);
}
});
}
private boolean isRestricted() {
// Only give privileged apps (like Settings) access to fingerprint info
final boolean restricted = !hasPermission(MANAGE_FINGERPRINT);
return restricted;
}
@Override // Binder call
public void cancelEnrollment(final IBinder token) {
checkPermission(MANAGE_FINGERPRINT);
mHandler.post(new Runnable() {
@Override
public void run() {
stopEnrollment(token, true);
}
});
}
@Override // Binder call
public void authenticate(final IBinder token, final long opId, final int groupId,
final IFingerprintServiceReceiver receiver, final int flags,
final String opPackageName) {
if (!isCurrentUserOrProfile(UserHandle.getCallingUserId())) {
Slog.w(TAG, "Can't authenticate non-current user");
return;
}
if (!canUseFingerprint(opPackageName)) {
Slog.w(TAG, "Calling not granted permission to use fingerprint");
return;
}
// Group ID is arbitrarily set to parent profile user ID. It just represents
// the default fingerprints for the user.
final int effectiveGroupId = getEffectiveUserId(groupId);
final boolean restricted = isRestricted();
mHandler.post(new Runnable() {
@Override
public void run() {
startAuthentication(token, opId, effectiveGroupId, receiver, flags, restricted);
}
});
}
@Override // Binder call
public void cancelAuthentication(final IBinder token, String opPackageName) {
if (!canUseFingerprint(opPackageName)) {
return;
}
mHandler.post(new Runnable() {
@Override
public void run() {
stopAuthentication(token, true);
}
});
}
@Override // Binder call
public void remove(final IBinder token, final int fingerId, final int groupId,
final IFingerprintServiceReceiver receiver) {
checkPermission(MANAGE_FINGERPRINT); // TODO: Maybe have another permission
final boolean restricted = isRestricted();
// Group ID is arbitrarily set to parent profile user ID. It just represents
// the default fingerprints for the user.
final int effectiveGroupId = getEffectiveUserId(groupId);
mHandler.post(new Runnable() {
@Override
public void run() {
startRemove(token, fingerId, effectiveGroupId, receiver, restricted);
}
});
}
@Override // Binder call
public boolean isHardwareDetected(long deviceId, String opPackageName) {
if (!canUseFingerprint(opPackageName)) {
return false;
}
return mHalDeviceId != 0;
}
@Override // Binder call
public void rename(final int fingerId, final int groupId, final String name) {
checkPermission(MANAGE_FINGERPRINT);
// Group ID is arbitrarily set to parent profile user ID. It just represents
// the default fingerprints for the user.
final int effectiveGroupId = getEffectiveUserId(groupId);
mHandler.post(new Runnable() {
@Override
public void run() {
mFingerprintUtils.renameFingerprintForUser(mContext, fingerId,
effectiveGroupId, name);
}
});
}
@Override // Binder call
public List<Fingerprint> getEnrolledFingerprints(int userId, String opPackageName) {
if (!canUseFingerprint(opPackageName)) {
return Collections.emptyList();
}
int effectiveUserId = getEffectiveUserId(userId);
return FingerprintService.this.getEnrolledFingerprints(effectiveUserId);
}
@Override // Binder call
public boolean hasEnrolledFingerprints(int userId, String opPackageName) {
if (!canUseFingerprint(opPackageName)) {
return false;
}
int effectiveUserId = getEffectiveUserId(userId);
return FingerprintService.this.hasEnrolledFingerprints(effectiveUserId);
}
@Override // Binder call
public long getAuthenticatorId(String opPackageName) {
// In this method, we're not checking whether the caller is permitted to use fingerprint
// 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 fingerprint authentication for its use, and then query the key's
// characteristics (hidden API) which returns, among other things, fingerprint
// 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 fingerprint functionality. Thus, to avoiding throwing an
// unexpected SecurityException this method does not check whether its caller is
// permitted to use fingerprint API.
//
// The permission check should be restored once Android Keystore no longer invokes this
// method from inside app processes.
return FingerprintService.this.getAuthenticatorId();
}
}
@Override
public void onStart() {
publishBinderService(Context.FINGERPRINT_SERVICE, new FingerprintServiceWrapper());
IFingerprintDaemon daemon = getFingerprintDaemon();
if (DEBUG) Slog.v(TAG, "Fingerprint HAL id: " + mHalDeviceId);
listenForUserSwitches();
}
private void updateActiveGroup(int userId) {
IFingerprintDaemon daemon = getFingerprintDaemon();
if (daemon != null) {
try {
userId = getEffectiveUserId(userId);
final File systemDir = Environment.getUserSystemDirectory(userId);
final File fpDir = new File(systemDir, FP_DATA_DIR);
if (!fpDir.exists()) {
if (!fpDir.mkdir()) {
Slog.v(TAG, "Cannot make directory: " + fpDir.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(fpDir)) {
Slog.w(TAG, "Restorecons failed. Directory will have wrong label.");
return;
}
}
daemon.setActiveGroup(userId, fpDir.getAbsolutePath().getBytes());
} catch (RemoteException e) {
Slog.e(TAG, "Failed to setActiveGroup():", e);
}
}
}
private void listenForUserSwitches() {
try {
ActivityManagerNative.getDefault().registerUserSwitchObserver(
new IUserSwitchObserver.Stub() {
@Override
public void onUserSwitching(int newUserId, IRemoteCallback reply) {
mHandler.obtainMessage(MSG_USER_SWITCHING, newUserId, 0 /* unused */)
.sendToTarget();
}
@Override
public void onUserSwitchComplete(int newUserId) throws RemoteException {
// Ignore.
}
@Override
public void onForegroundProfileSwitch(int newProfileId) {
// Ignore.
}
});
} catch (RemoteException e) {
Slog.w(TAG, "Failed to listen for user switching event" ,e);
}
}
public long getAuthenticatorId() {
IFingerprintDaemon daemon = getFingerprintDaemon();
if (daemon != null) {
try {
return daemon.getAuthenticatorId();
} catch (RemoteException e) {
Slog.e(TAG, "getAuthenticatorId failed", e);
}
}
return 0;
}
}