LockSettingsService.java revision 2bcdad95330c75e3122d0736f1a40acd521dc243 
1/*
2 * Copyright (C) 2012 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
17package com.android.server.locksettings;
18
19import static android.Manifest.permission.ACCESS_KEYGUARD_SECURE_STORAGE;
20import static android.Manifest.permission.READ_CONTACTS;
21import static android.content.Context.KEYGUARD_SERVICE;
22import static android.content.pm.PackageManager.PERMISSION_GRANTED;
23
24import static com.android.internal.widget.LockPatternUtils.StrongAuthTracker.STRONG_AUTH_REQUIRED_AFTER_LOCKOUT;
25import static com.android.internal.widget.LockPatternUtils.SYNTHETIC_PASSWORD_ENABLED_KEY;
26import static com.android.internal.widget.LockPatternUtils.SYNTHETIC_PASSWORD_HANDLE_KEY;
27import static com.android.internal.widget.LockPatternUtils.USER_FRP;
28import static com.android.internal.widget.LockPatternUtils.frpCredentialEnabled;
29import static com.android.internal.widget.LockPatternUtils.userOwnsFrpCredential;
30
31import android.annotation.NonNull;
32import android.annotation.Nullable;
33import android.annotation.UserIdInt;
34import android.app.ActivityManager;
35import android.app.IActivityManager;
36import android.app.KeyguardManager;
37import android.app.Notification;
38import android.app.NotificationManager;
39import android.app.PendingIntent;
40import android.app.admin.DevicePolicyManager;
41import android.app.admin.DevicePolicyManagerInternal;
42import android.app.admin.PasswordMetrics;
43import android.app.backup.BackupManager;
44import android.app.trust.IStrongAuthTracker;
45import android.app.trust.TrustManager;
46import android.content.BroadcastReceiver;
47import android.content.ContentResolver;
48import android.content.Context;
49import android.content.Intent;
50import android.content.IntentFilter;
51import android.content.pm.PackageManager;
52import android.content.pm.UserInfo;
53import android.content.res.Resources;
54import android.database.ContentObserver;
55import android.database.sqlite.SQLiteDatabase;
56import android.net.Uri;
57import android.os.Binder;
58import android.os.Bundle;
59import android.os.Handler;
60import android.os.IBinder;
61import android.os.IProgressListener;
62import android.os.Process;
63import android.os.RemoteException;
64import android.os.ResultReceiver;
65import android.os.ServiceManager;
66import android.os.ShellCallback;
67import android.os.StrictMode;
68import android.os.SystemProperties;
69import android.os.UserHandle;
70import android.os.UserManager;
71import android.os.storage.IStorageManager;
72import android.os.storage.StorageManager;
73import android.provider.Settings;
74import android.provider.Settings.Secure;
75import android.provider.Settings.SettingNotFoundException;
76import android.security.KeyStore;
77import android.security.keystore.AndroidKeyStoreProvider;
78import android.security.keystore.KeyProperties;
79import android.security.keystore.KeyProtection;
80import android.security.keystore.KeychainProtectionParams;
81import android.security.keystore.UserNotAuthenticatedException;
82import android.security.keystore.WrappedApplicationKey;
83import android.security.keystore.KeychainSnapshot;
84import android.service.gatekeeper.GateKeeperResponse;
85import android.service.gatekeeper.IGateKeeperService;
86import android.text.TextUtils;
87import android.util.ArrayMap;
88import android.util.EventLog;
89import android.util.Log;
90import android.util.Slog;
91import android.util.SparseArray;
92
93import com.android.internal.annotations.GuardedBy;
94import com.android.internal.annotations.VisibleForTesting;
95import com.android.internal.messages.nano.SystemMessageProto.SystemMessage;
96import com.android.internal.notification.SystemNotificationChannels;
97import com.android.internal.util.ArrayUtils;
98import com.android.internal.util.DumpUtils;
99import com.android.internal.util.Preconditions;
100import com.android.internal.widget.ICheckCredentialProgressCallback;
101import com.android.internal.widget.ILockSettings;
102import com.android.internal.widget.LockPatternUtils;
103import com.android.internal.widget.VerifyCredentialResponse;
104import com.android.server.LocalServices;
105import com.android.server.SystemService;
106import com.android.server.locksettings.LockSettingsStorage.CredentialHash;
107import com.android.server.locksettings.LockSettingsStorage.PersistentData;
108import com.android.server.locksettings.recoverablekeystore.RecoverableKeyStoreManager;
109import com.android.server.locksettings.SyntheticPasswordManager.AuthenticationResult;
110import com.android.server.locksettings.SyntheticPasswordManager.AuthenticationToken;
111
112import libcore.util.HexEncoding;
113
114import java.io.ByteArrayOutputStream;
115import java.io.FileDescriptor;
116import java.io.FileNotFoundException;
117import java.io.IOException;
118import java.io.PrintWriter;
119import java.nio.charset.StandardCharsets;
120import java.security.InvalidAlgorithmParameterException;
121import java.security.InvalidKeyException;
122import java.security.KeyStoreException;
123import java.security.MessageDigest;
124import java.security.NoSuchAlgorithmException;
125import java.security.SecureRandom;
126import java.security.UnrecoverableKeyException;
127import java.security.cert.CertificateException;
128import java.util.Arrays;
129import java.util.List;
130import java.util.Map;
131import java.util.concurrent.CountDownLatch;
132import java.util.concurrent.TimeUnit;
133
134import javax.crypto.BadPaddingException;
135import javax.crypto.Cipher;
136import javax.crypto.IllegalBlockSizeException;
137import javax.crypto.KeyGenerator;
138import javax.crypto.NoSuchPaddingException;
139import javax.crypto.SecretKey;
140import javax.crypto.spec.GCMParameterSpec;
141
142/**
143 * Keeps the lock pattern/password data and related settings for each user. Used by
144 * LockPatternUtils. Needs to be a service because Settings app also needs to be able to save
145 * lockscreen information for secondary users.
146 *
147 * @hide
148 */
149public class LockSettingsService extends ILockSettings.Stub {
150    private static final String TAG = "LockSettingsService";
151    private static final String PERMISSION = ACCESS_KEYGUARD_SECURE_STORAGE;
152    private static final boolean DEBUG = false;
153
154    private static final int PROFILE_KEY_IV_SIZE = 12;
155    private static final String SEPARATE_PROFILE_CHALLENGE_KEY = "lockscreen.profilechallenge";
156    private static final int SYNTHETIC_PASSWORD_ENABLED_BY_DEFAULT = 1;
157
158    // Order of holding lock: mSeparateChallengeLock -> mSpManager -> this
159    // Do not call into ActivityManager while holding mSpManager lock.
160    private final Object mSeparateChallengeLock = new Object();
161
162    private final DeviceProvisionedObserver mDeviceProvisionedObserver =
163            new DeviceProvisionedObserver();
164
165    private final Injector mInjector;
166    private final Context mContext;
167    @VisibleForTesting
168    protected final Handler mHandler;
169    @VisibleForTesting
170    protected final LockSettingsStorage mStorage;
171    private final LockSettingsStrongAuth mStrongAuth;
172    private final SynchronizedStrongAuthTracker mStrongAuthTracker;
173
174    private final LockPatternUtils mLockPatternUtils;
175    private final NotificationManager mNotificationManager;
176    private final UserManager mUserManager;
177    private final IActivityManager mActivityManager;
178    private final SyntheticPasswordManager mSpManager;
179
180    private final KeyStore mKeyStore;
181
182    private final RecoverableKeyStoreManager mRecoverableKeyStoreManager;
183
184    private boolean mFirstCallToVold;
185    protected IGateKeeperService mGateKeeperService;
186
187    /**
188     * The UIDs that are used for system credential storage in keystore.
189     */
190    private static final int[] SYSTEM_CREDENTIAL_UIDS = {
191            Process.WIFI_UID, Process.VPN_UID,
192            Process.ROOT_UID, Process.SYSTEM_UID };
193
194    // This class manages life cycle events for encrypted users on File Based Encryption (FBE)
195    // devices. The most basic of these is to show/hide notifications about missing features until
196    // the user unlocks the account and credential-encrypted storage is available.
197    public static final class Lifecycle extends SystemService {
198        private LockSettingsService mLockSettingsService;
199
200        public Lifecycle(Context context) {
201            super(context);
202        }
203
204        @Override
205        public void onStart() {
206            AndroidKeyStoreProvider.install();
207            mLockSettingsService = new LockSettingsService(getContext());
208            publishBinderService("lock_settings", mLockSettingsService);
209        }
210
211        @Override
212        public void onBootPhase(int phase) {
213            super.onBootPhase(phase);
214            if (phase == PHASE_ACTIVITY_MANAGER_READY) {
215                mLockSettingsService.migrateOldDataAfterSystemReady();
216            }
217        }
218
219        @Override
220        public void onStartUser(int userHandle) {
221            mLockSettingsService.onStartUser(userHandle);
222        }
223
224        @Override
225        public void onUnlockUser(int userHandle) {
226            mLockSettingsService.onUnlockUser(userHandle);
227        }
228
229        @Override
230        public void onCleanupUser(int userHandle) {
231            mLockSettingsService.onCleanupUser(userHandle);
232        }
233    }
234
235    @VisibleForTesting
236    protected static class SynchronizedStrongAuthTracker
237            extends LockPatternUtils.StrongAuthTracker {
238        public SynchronizedStrongAuthTracker(Context context) {
239            super(context);
240        }
241
242        @Override
243        protected void handleStrongAuthRequiredChanged(int strongAuthFlags, int userId) {
244            synchronized (this) {
245                super.handleStrongAuthRequiredChanged(strongAuthFlags, userId);
246            }
247        }
248
249        @Override
250        public int getStrongAuthForUser(int userId) {
251            synchronized (this) {
252                return super.getStrongAuthForUser(userId);
253            }
254        }
255
256        void register(LockSettingsStrongAuth strongAuth) {
257            strongAuth.registerStrongAuthTracker(this.mStub);
258        }
259    }
260
261    /**
262     * Tie managed profile to primary profile if it is in unified mode and not tied before.
263     *
264     * @param managedUserId Managed profile user Id
265     * @param managedUserPassword Managed profile original password (when it has separated lock).
266     *            NULL when it does not have a separated lock before.
267     */
268    public void tieManagedProfileLockIfNecessary(int managedUserId, String managedUserPassword) {
269        if (DEBUG) Slog.v(TAG, "Check child profile lock for user: " + managedUserId);
270        // Only for managed profile
271        if (!mUserManager.getUserInfo(managedUserId).isManagedProfile()) {
272            return;
273        }
274        // Do not tie managed profile when work challenge is enabled
275        if (mLockPatternUtils.isSeparateProfileChallengeEnabled(managedUserId)) {
276            return;
277        }
278        // Do not tie managed profile to parent when it's done already
279        if (mStorage.hasChildProfileLock(managedUserId)) {
280            return;
281        }
282        // Do not tie it to parent when parent does not have a screen lock
283        final int parentId = mUserManager.getProfileParent(managedUserId).id;
284        if (!isUserSecure(parentId)) {
285            if (DEBUG) Slog.v(TAG, "Parent does not have a screen lock");
286            return;
287        }
288        // Do not tie when the parent has no SID (but does have a screen lock).
289        // This can only happen during an upgrade path where SID is yet to be
290        // generated when the user unlocks for the first time.
291        try {
292            if (getGateKeeperService().getSecureUserId(parentId) == 0) {
293                return;
294            }
295        } catch (RemoteException e) {
296            Slog.e(TAG, "Failed to talk to GateKeeper service", e);
297            return;
298        }
299        if (DEBUG) Slog.v(TAG, "Tie managed profile to parent now!");
300        byte[] randomLockSeed = new byte[] {};
301        try {
302            randomLockSeed = SecureRandom.getInstance("SHA1PRNG").generateSeed(40);
303            String newPassword = String.valueOf(HexEncoding.encode(randomLockSeed));
304            final int quality = DevicePolicyManager.PASSWORD_QUALITY_ALPHANUMERIC;
305            setLockCredentialInternal(newPassword, LockPatternUtils.CREDENTIAL_TYPE_PASSWORD,
306                    managedUserPassword, quality, managedUserId);
307            // We store a private credential for the managed user that's unlocked by the primary
308            // account holder's credential. As such, the user will never be prompted to enter this
309            // password directly, so we always store a password.
310            setLong(LockPatternUtils.PASSWORD_TYPE_KEY, quality, managedUserId);
311            tieProfileLockToParent(managedUserId, newPassword);
312        } catch (NoSuchAlgorithmException | RemoteException e) {
313            Slog.e(TAG, "Fail to tie managed profile", e);
314            // Nothing client can do to fix this issue, so we do not throw exception out
315        }
316    }
317
318    static class Injector {
319
320        protected Context mContext;
321
322        public Injector(Context context) {
323            mContext = context;
324        }
325
326        public Context getContext() {
327            return mContext;
328        }
329
330        public Handler getHandler() {
331            return new Handler();
332        }
333
334        public LockSettingsStorage getStorage() {
335            final LockSettingsStorage storage = new LockSettingsStorage(mContext);
336            storage.setDatabaseOnCreateCallback(new LockSettingsStorage.Callback() {
337                @Override
338                public void initialize(SQLiteDatabase db) {
339                    // Get the lockscreen default from a system property, if available
340                    boolean lockScreenDisable = SystemProperties.getBoolean(
341                            "ro.lockscreen.disable.default", false);
342                    if (lockScreenDisable) {
343                        storage.writeKeyValue(db, LockPatternUtils.DISABLE_LOCKSCREEN_KEY, "1", 0);
344                    }
345                }
346            });
347            return storage;
348        }
349
350        public LockSettingsStrongAuth getStrongAuth() {
351            return new LockSettingsStrongAuth(mContext);
352        }
353
354        public SynchronizedStrongAuthTracker getStrongAuthTracker() {
355            return new SynchronizedStrongAuthTracker(mContext);
356        }
357
358        public IActivityManager getActivityManager() {
359            return ActivityManager.getService();
360        }
361
362        public LockPatternUtils getLockPatternUtils() {
363            return new LockPatternUtils(mContext);
364        }
365
366        public NotificationManager getNotificationManager() {
367            return (NotificationManager) mContext.getSystemService(Context.NOTIFICATION_SERVICE);
368        }
369
370        public UserManager getUserManager() {
371            return (UserManager) mContext.getSystemService(Context.USER_SERVICE);
372        }
373
374        public DevicePolicyManager getDevicePolicyManager() {
375            return (DevicePolicyManager) mContext.getSystemService(Context.DEVICE_POLICY_SERVICE);
376        }
377
378        public KeyStore getKeyStore() {
379            return KeyStore.getInstance();
380        }
381
382        public RecoverableKeyStoreManager getRecoverableKeyStoreManager() {
383            return RecoverableKeyStoreManager.getInstance(mContext);
384        }
385
386        public IStorageManager getStorageManager() {
387            final IBinder service = ServiceManager.getService("mount");
388            if (service != null) {
389                return IStorageManager.Stub.asInterface(service);
390            }
391            return null;
392        }
393
394        public SyntheticPasswordManager getSyntheticPasswordManager(LockSettingsStorage storage) {
395            return new SyntheticPasswordManager(getContext(), storage, getUserManager());
396        }
397
398        public int binderGetCallingUid() {
399            return Binder.getCallingUid();
400        }
401    }
402
403    public LockSettingsService(Context context) {
404        this(new Injector(context));
405    }
406
407    @VisibleForTesting
408    protected LockSettingsService(Injector injector) {
409        mInjector = injector;
410        mContext = injector.getContext();
411        mKeyStore = injector.getKeyStore();
412        mRecoverableKeyStoreManager = injector.getRecoverableKeyStoreManager();
413        mHandler = injector.getHandler();
414        mStrongAuth = injector.getStrongAuth();
415        mActivityManager = injector.getActivityManager();
416
417        mLockPatternUtils = injector.getLockPatternUtils();
418        mFirstCallToVold = true;
419
420        IntentFilter filter = new IntentFilter();
421        filter.addAction(Intent.ACTION_USER_ADDED);
422        filter.addAction(Intent.ACTION_USER_STARTING);
423        filter.addAction(Intent.ACTION_USER_REMOVED);
424        injector.getContext().registerReceiverAsUser(mBroadcastReceiver, UserHandle.ALL, filter,
425                null, null);
426
427        mStorage = injector.getStorage();
428        mNotificationManager = injector.getNotificationManager();
429        mUserManager = injector.getUserManager();
430        mStrongAuthTracker = injector.getStrongAuthTracker();
431        mStrongAuthTracker.register(mStrongAuth);
432
433        mSpManager = injector.getSyntheticPasswordManager(mStorage);
434    }
435
436    /**
437     * If the account is credential-encrypted, show notification requesting the user to unlock the
438     * device.
439     */
440    private void maybeShowEncryptionNotificationForUser(@UserIdInt int userId) {
441        final UserInfo user = mUserManager.getUserInfo(userId);
442        if (!user.isManagedProfile()) {
443            // When the user is locked, we communicate it loud-and-clear
444            // on the lockscreen; we only show a notification below for
445            // locked managed profiles.
446            return;
447        }
448
449        final UserHandle userHandle = user.getUserHandle();
450        final boolean isSecure = isUserSecure(userId);
451        if (isSecure && !mUserManager.isUserUnlockingOrUnlocked(userHandle)) {
452            UserInfo parent = mUserManager.getProfileParent(userId);
453            if (parent != null &&
454                    mUserManager.isUserUnlockingOrUnlocked(parent.getUserHandle()) &&
455                    !mUserManager.isQuietModeEnabled(userHandle)) {
456                // Only show notifications for managed profiles once their parent
457                // user is unlocked.
458                showEncryptionNotificationForProfile(userHandle);
459            }
460        }
461    }
462
463    private void showEncryptionNotificationForProfile(UserHandle user) {
464        Resources r = mContext.getResources();
465        CharSequence title = r.getText(
466                com.android.internal.R.string.user_encrypted_title);
467        CharSequence message = r.getText(
468                com.android.internal.R.string.profile_encrypted_message);
469        CharSequence detail = r.getText(
470                com.android.internal.R.string.profile_encrypted_detail);
471
472        final KeyguardManager km = (KeyguardManager) mContext.getSystemService(KEYGUARD_SERVICE);
473        final Intent unlockIntent = km.createConfirmDeviceCredentialIntent(null, null,
474                user.getIdentifier());
475        if (unlockIntent == null) {
476            return;
477        }
478        unlockIntent.setFlags(
479                Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS);
480        PendingIntent intent = PendingIntent.getActivity(mContext, 0, unlockIntent,
481                PendingIntent.FLAG_UPDATE_CURRENT);
482
483        showEncryptionNotification(user, title, message, detail, intent);
484    }
485
486    private void showEncryptionNotification(UserHandle user, CharSequence title,
487            CharSequence message, CharSequence detail, PendingIntent intent) {
488        if (DEBUG) Slog.v(TAG, "showing encryption notification, user: " + user.getIdentifier());
489
490        // Suppress all notifications on non-FBE devices for now
491        if (!StorageManager.isFileEncryptedNativeOrEmulated()) return;
492
493        Notification notification =
494                new Notification.Builder(mContext, SystemNotificationChannels.SECURITY)
495                        .setSmallIcon(com.android.internal.R.drawable.ic_user_secure)
496                        .setWhen(0)
497                        .setOngoing(true)
498                        .setTicker(title)
499                        .setColor(mContext.getColor(
500                                com.android.internal.R.color.system_notification_accent_color))
501                        .setContentTitle(title)
502                        .setContentText(message)
503                        .setSubText(detail)
504                        .setVisibility(Notification.VISIBILITY_PUBLIC)
505                        .setContentIntent(intent)
506                        .build();
507        mNotificationManager.notifyAsUser(null, SystemMessage.NOTE_FBE_ENCRYPTED_NOTIFICATION,
508            notification, user);
509    }
510
511    private void hideEncryptionNotification(UserHandle userHandle) {
512        if (DEBUG) Slog.v(TAG, "hide encryption notification, user: " + userHandle.getIdentifier());
513        mNotificationManager.cancelAsUser(null, SystemMessage.NOTE_FBE_ENCRYPTED_NOTIFICATION,
514            userHandle);
515    }
516
517    public void onCleanupUser(int userId) {
518        hideEncryptionNotification(new UserHandle(userId));
519    }
520
521    public void onStartUser(final int userId) {
522        maybeShowEncryptionNotificationForUser(userId);
523    }
524
525    /**
526     * Check if profile got unlocked but the keystore is still locked. This happens on full disk
527     * encryption devices since the profile may not yet be running when we consider unlocking it
528     * during the normal flow. In this case unlock the keystore for the profile.
529     */
530    private void ensureProfileKeystoreUnlocked(int userId) {
531        final KeyStore ks = KeyStore.getInstance();
532        if (ks.state(userId) == KeyStore.State.LOCKED
533                && tiedManagedProfileReadyToUnlock(mUserManager.getUserInfo(userId))) {
534            Slog.i(TAG, "Managed profile got unlocked, will unlock its keystore");
535            try {
536                // If boot took too long and the password in vold got expired, parent keystore will
537                // be still locked, we ignore this case since the user will be prompted to unlock
538                // the device after boot.
539                unlockChildProfile(userId, true /* ignoreUserNotAuthenticated */);
540            } catch (RemoteException e) {
541                Slog.e(TAG, "Failed to unlock child profile");
542            }
543        }
544    }
545
546    public void onUnlockUser(final int userId) {
547        // Perform tasks which require locks in LSS on a handler, as we are callbacks from
548        // ActivityManager.unlockUser()
549        mHandler.post(new Runnable() {
550            @Override
551            public void run() {
552                ensureProfileKeystoreUnlocked(userId);
553                // Hide notification first, as tie managed profile lock takes time
554                hideEncryptionNotification(new UserHandle(userId));
555
556                // Now we have unlocked the parent user we should show notifications
557                // about any profiles that exist.
558                List<UserInfo> profiles = mUserManager.getProfiles(userId);
559                for (int i = 0; i < profiles.size(); i++) {
560                    UserInfo profile = profiles.get(i);
561                    final boolean isSecure = isUserSecure(profile.id);
562                    if (isSecure && profile.isManagedProfile()) {
563                        UserHandle userHandle = profile.getUserHandle();
564                        if (!mUserManager.isUserUnlockingOrUnlocked(userHandle) &&
565                                !mUserManager.isQuietModeEnabled(userHandle)) {
566                            showEncryptionNotificationForProfile(userHandle);
567                        }
568                    }
569                }
570
571                if (mUserManager.getUserInfo(userId).isManagedProfile()) {
572                    tieManagedProfileLockIfNecessary(userId, null);
573                }
574            }
575        });
576    }
577
578    private final BroadcastReceiver mBroadcastReceiver = new BroadcastReceiver() {
579        @Override
580        public void onReceive(Context context, Intent intent) {
581            if (Intent.ACTION_USER_ADDED.equals(intent.getAction())) {
582                // Notify keystore that a new user was added.
583                final int userHandle = intent.getIntExtra(Intent.EXTRA_USER_HANDLE, 0);
584                if (userHandle > UserHandle.USER_SYSTEM) {
585                    removeUser(userHandle, /* unknownUser= */ true);
586                }
587                final KeyStore ks = KeyStore.getInstance();
588                final UserInfo parentInfo = mUserManager.getProfileParent(userHandle);
589                final int parentHandle = parentInfo != null ? parentInfo.id : -1;
590                ks.onUserAdded(userHandle, parentHandle);
591            } else if (Intent.ACTION_USER_STARTING.equals(intent.getAction())) {
592                final int userHandle = intent.getIntExtra(Intent.EXTRA_USER_HANDLE, 0);
593                mStorage.prefetchUser(userHandle);
594            } else if (Intent.ACTION_USER_REMOVED.equals(intent.getAction())) {
595                final int userHandle = intent.getIntExtra(Intent.EXTRA_USER_HANDLE, 0);
596                if (userHandle > 0) {
597                    removeUser(userHandle, /* unknownUser= */ false);
598                }
599            }
600        }
601    };
602
603    @Override // binder interface
604    public void systemReady() {
605        if (mContext.checkCallingOrSelfPermission(PERMISSION) != PERMISSION_GRANTED) {
606            EventLog.writeEvent(0x534e4554, "28251513", getCallingUid(), "");  // SafetyNet
607        }
608        checkWritePermission(UserHandle.USER_SYSTEM);
609        migrateOldData();
610        try {
611            getGateKeeperService();
612            mSpManager.initWeaverService();
613        } catch (RemoteException e) {
614            Slog.e(TAG, "Failure retrieving IGateKeeperService", e);
615        }
616        mDeviceProvisionedObserver.onSystemReady();
617        // TODO: maybe skip this for split system user mode.
618        mStorage.prefetchUser(UserHandle.USER_SYSTEM);
619        mStrongAuth.systemReady();
620    }
621
622    private void migrateOldData() {
623        // These Settings moved before multi-user was enabled, so we only have to do it for the
624        // root user.
625        if (getString("migrated", null, 0) == null) {
626            final ContentResolver cr = mContext.getContentResolver();
627            for (String validSetting : VALID_SETTINGS) {
628                String value = Settings.Secure.getString(cr, validSetting);
629                if (value != null) {
630                    setString(validSetting, value, 0);
631                }
632            }
633            // No need to move the password / pattern files. They're already in the right place.
634            setString("migrated", "true", 0);
635            Slog.i(TAG, "Migrated lock settings to new location");
636        }
637
638        // These Settings changed after multi-user was enabled, hence need to be moved per user.
639        if (getString("migrated_user_specific", null, 0) == null) {
640            final ContentResolver cr = mContext.getContentResolver();
641            List<UserInfo> users = mUserManager.getUsers();
642            for (int user = 0; user < users.size(); user++) {
643                // Migrate owner info
644                final int userId = users.get(user).id;
645                final String OWNER_INFO = Secure.LOCK_SCREEN_OWNER_INFO;
646                String ownerInfo = Settings.Secure.getStringForUser(cr, OWNER_INFO, userId);
647                if (!TextUtils.isEmpty(ownerInfo)) {
648                    setString(OWNER_INFO, ownerInfo, userId);
649                    Settings.Secure.putStringForUser(cr, OWNER_INFO, "", userId);
650                }
651
652                // Migrate owner info enabled. Note there was a bug where older platforms only
653                // stored this value if the checkbox was toggled at least once. The code detects
654                // this case by handling the exception.
655                final String OWNER_INFO_ENABLED = Secure.LOCK_SCREEN_OWNER_INFO_ENABLED;
656                boolean enabled;
657                try {
658                    int ivalue = Settings.Secure.getIntForUser(cr, OWNER_INFO_ENABLED, userId);
659                    enabled = ivalue != 0;
660                    setLong(OWNER_INFO_ENABLED, enabled ? 1 : 0, userId);
661                } catch (SettingNotFoundException e) {
662                    // Setting was never stored. Store it if the string is not empty.
663                    if (!TextUtils.isEmpty(ownerInfo)) {
664                        setLong(OWNER_INFO_ENABLED, 1, userId);
665                    }
666                }
667                Settings.Secure.putIntForUser(cr, OWNER_INFO_ENABLED, 0, userId);
668            }
669            // No need to move the password / pattern files. They're already in the right place.
670            setString("migrated_user_specific", "true", 0);
671            Slog.i(TAG, "Migrated per-user lock settings to new location");
672        }
673
674        // Migrates biometric weak such that the fallback mechanism becomes the primary.
675        if (getString("migrated_biometric_weak", null, 0) == null) {
676            List<UserInfo> users = mUserManager.getUsers();
677            for (int i = 0; i < users.size(); i++) {
678                int userId = users.get(i).id;
679                long type = getLong(LockPatternUtils.PASSWORD_TYPE_KEY,
680                        DevicePolicyManager.PASSWORD_QUALITY_UNSPECIFIED,
681                        userId);
682                long alternateType = getLong(LockPatternUtils.PASSWORD_TYPE_ALTERNATE_KEY,
683                        DevicePolicyManager.PASSWORD_QUALITY_UNSPECIFIED,
684                        userId);
685                if (type == DevicePolicyManager.PASSWORD_QUALITY_BIOMETRIC_WEAK) {
686                    setLong(LockPatternUtils.PASSWORD_TYPE_KEY,
687                            alternateType,
688                            userId);
689                }
690                setLong(LockPatternUtils.PASSWORD_TYPE_ALTERNATE_KEY,
691                        DevicePolicyManager.PASSWORD_QUALITY_UNSPECIFIED,
692                        userId);
693            }
694            setString("migrated_biometric_weak", "true", 0);
695            Slog.i(TAG, "Migrated biometric weak to use the fallback instead");
696        }
697
698        // Migrates lockscreen.disabled. Prior to M, the flag was ignored when more than one
699        // user was present on the system, so if we're upgrading to M and there is more than one
700        // user we disable the flag to remain consistent.
701        if (getString("migrated_lockscreen_disabled", null, 0) == null) {
702            final List<UserInfo> users = mUserManager.getUsers();
703            final int userCount = users.size();
704            int switchableUsers = 0;
705            for (int i = 0; i < userCount; i++) {
706                if (users.get(i).supportsSwitchTo()) {
707                    switchableUsers++;
708                }
709            }
710
711            if (switchableUsers > 1) {
712                for (int i = 0; i < userCount; i++) {
713                    int id = users.get(i).id;
714
715                    if (getBoolean(LockPatternUtils.DISABLE_LOCKSCREEN_KEY, false, id)) {
716                        setBoolean(LockPatternUtils.DISABLE_LOCKSCREEN_KEY, false, id);
717                    }
718                }
719            }
720
721            setString("migrated_lockscreen_disabled", "true", 0);
722            Slog.i(TAG, "Migrated lockscreen disabled flag");
723        }
724
725        final List<UserInfo> users = mUserManager.getUsers();
726        for (int i = 0; i < users.size(); i++) {
727            final UserInfo userInfo = users.get(i);
728            if (userInfo.isManagedProfile() && mStorage.hasChildProfileLock(userInfo.id)) {
729                // When managed profile has a unified lock, the password quality stored has 2
730                // possibilities only.
731                // 1). PASSWORD_QUALITY_UNSPECIFIED, which is upgraded from dp2, and we are
732                // going to set it back to PASSWORD_QUALITY_ALPHANUMERIC.
733                // 2). PASSWORD_QUALITY_ALPHANUMERIC, which is the actual password quality for
734                // unified lock.
735                final long quality = getLong(LockPatternUtils.PASSWORD_TYPE_KEY,
736                        DevicePolicyManager.PASSWORD_QUALITY_UNSPECIFIED, userInfo.id);
737                if (quality == DevicePolicyManager.PASSWORD_QUALITY_UNSPECIFIED) {
738                    // Only possible when it's upgraded from nyc dp3
739                    Slog.i(TAG, "Migrated tied profile lock type");
740                    setLong(LockPatternUtils.PASSWORD_TYPE_KEY,
741                            DevicePolicyManager.PASSWORD_QUALITY_ALPHANUMERIC, userInfo.id);
742                } else if (quality != DevicePolicyManager.PASSWORD_QUALITY_ALPHANUMERIC) {
743                    // It should not happen
744                    Slog.e(TAG, "Invalid tied profile lock type: " + quality);
745                }
746            }
747            try {
748                final String alias = LockPatternUtils.PROFILE_KEY_NAME_ENCRYPT + userInfo.id;
749                java.security.KeyStore keyStore =
750                        java.security.KeyStore.getInstance("AndroidKeyStore");
751                keyStore.load(null);
752                if (keyStore.containsAlias(alias)) {
753                    keyStore.deleteEntry(alias);
754                }
755            } catch (KeyStoreException | NoSuchAlgorithmException |
756                    CertificateException | IOException e) {
757                Slog.e(TAG, "Unable to remove tied profile key", e);
758            }
759        }
760
761        boolean isWatch = mContext.getPackageManager().hasSystemFeature(
762                PackageManager.FEATURE_WATCH);
763        // Wear used to set DISABLE_LOCKSCREEN to 'true', but because Wear now allows accounts
764        // and device management the lockscreen must be re-enabled now for users that upgrade.
765        if (isWatch && getString("migrated_wear_lockscreen_disabled", null, 0) == null) {
766            final int userCount = users.size();
767            for (int i = 0; i < userCount; i++) {
768                int id = users.get(i).id;
769                setBoolean(LockPatternUtils.DISABLE_LOCKSCREEN_KEY, false, id);
770            }
771            setString("migrated_wear_lockscreen_disabled", "true", 0);
772            Slog.i(TAG, "Migrated lockscreen_disabled for Wear devices");
773        }
774    }
775
776    private void migrateOldDataAfterSystemReady() {
777        try {
778            // Migrate the FRP credential to the persistent data block
779            if (LockPatternUtils.frpCredentialEnabled(mContext)
780                    && !getBoolean("migrated_frp", false, 0)) {
781                migrateFrpCredential();
782                setBoolean("migrated_frp", true, 0);
783                Slog.i(TAG, "Migrated migrated_frp.");
784            }
785        } catch (RemoteException e) {
786            Slog.e(TAG, "Unable to migrateOldDataAfterSystemReady", e);
787        }
788    }
789
790    /**
791     * Migrate the credential for the FRP credential owner user if the following are satisfied:
792     * - the user has a secure credential
793     * - the FRP credential is not set up
794     * - the credential is based on a synthetic password.
795     */
796    private void migrateFrpCredential() throws RemoteException {
797        if (mStorage.readPersistentDataBlock() != PersistentData.NONE) {
798            return;
799        }
800        for (UserInfo userInfo : mUserManager.getUsers()) {
801            if (userOwnsFrpCredential(mContext, userInfo) && isUserSecure(userInfo.id)) {
802                synchronized (mSpManager) {
803                    if (isSyntheticPasswordBasedCredentialLocked(userInfo.id)) {
804                        int actualQuality = (int) getLong(LockPatternUtils.PASSWORD_TYPE_KEY,
805                                DevicePolicyManager.PASSWORD_QUALITY_UNSPECIFIED, userInfo.id);
806
807                        mSpManager.migrateFrpPasswordLocked(
808                                getSyntheticPasswordHandleLocked(userInfo.id),
809                                userInfo,
810                                redactActualQualityToMostLenientEquivalentQuality(actualQuality));
811                    }
812                }
813                return;
814            }
815        }
816    }
817
818    /**
819     * Returns the lowest password quality that still presents the same UI for entering it.
820     *
821     * For the FRP credential, we do not want to leak the actual quality of the password, only what
822     * kind of UI it requires. However, when migrating, we only know the actual quality, not the
823     * originally requested quality; since this is only used to determine what input variant to
824     * present to the user, we just assume the lowest possible quality was requested.
825     */
826    private int redactActualQualityToMostLenientEquivalentQuality(int quality) {
827        switch (quality) {
828            case DevicePolicyManager.PASSWORD_QUALITY_ALPHABETIC:
829            case DevicePolicyManager.PASSWORD_QUALITY_ALPHANUMERIC:
830            case DevicePolicyManager.PASSWORD_QUALITY_COMPLEX:
831                return DevicePolicyManager.PASSWORD_QUALITY_ALPHABETIC;
832            case DevicePolicyManager.PASSWORD_QUALITY_NUMERIC:
833            case DevicePolicyManager.PASSWORD_QUALITY_NUMERIC_COMPLEX:
834                return DevicePolicyManager.PASSWORD_QUALITY_NUMERIC;
835            case DevicePolicyManager.PASSWORD_QUALITY_UNSPECIFIED:
836            case DevicePolicyManager.PASSWORD_QUALITY_SOMETHING:
837            case DevicePolicyManager.PASSWORD_QUALITY_MANAGED:
838            case DevicePolicyManager.PASSWORD_QUALITY_BIOMETRIC_WEAK:
839            default:
840                return quality;
841        }
842    }
843
844    private final void checkWritePermission(int userId) {
845        mContext.enforceCallingOrSelfPermission(PERMISSION, "LockSettingsWrite");
846    }
847
848    private final void checkPasswordReadPermission(int userId) {
849        mContext.enforceCallingOrSelfPermission(PERMISSION, "LockSettingsRead");
850    }
851
852    private final void checkPasswordHavePermission(int userId) {
853        if (mContext.checkCallingOrSelfPermission(PERMISSION) != PERMISSION_GRANTED) {
854            EventLog.writeEvent(0x534e4554, "28251513", getCallingUid(), "");  // SafetyNet
855        }
856        mContext.enforceCallingOrSelfPermission(PERMISSION, "LockSettingsHave");
857    }
858
859    private final void checkReadPermission(String requestedKey, int userId) {
860        final int callingUid = Binder.getCallingUid();
861
862        for (int i = 0; i < READ_CONTACTS_PROTECTED_SETTINGS.length; i++) {
863            String key = READ_CONTACTS_PROTECTED_SETTINGS[i];
864            if (key.equals(requestedKey) && mContext.checkCallingOrSelfPermission(READ_CONTACTS)
865                    != PackageManager.PERMISSION_GRANTED) {
866                throw new SecurityException("uid=" + callingUid
867                        + " needs permission " + READ_CONTACTS + " to read "
868                        + requestedKey + " for user " + userId);
869            }
870        }
871
872        for (int i = 0; i < READ_PASSWORD_PROTECTED_SETTINGS.length; i++) {
873            String key = READ_PASSWORD_PROTECTED_SETTINGS[i];
874            if (key.equals(requestedKey) && mContext.checkCallingOrSelfPermission(PERMISSION)
875                    != PackageManager.PERMISSION_GRANTED) {
876                throw new SecurityException("uid=" + callingUid
877                        + " needs permission " + PERMISSION + " to read "
878                        + requestedKey + " for user " + userId);
879            }
880        }
881    }
882
883    @Override
884    public boolean getSeparateProfileChallengeEnabled(int userId) {
885        checkReadPermission(SEPARATE_PROFILE_CHALLENGE_KEY, userId);
886        synchronized (mSeparateChallengeLock) {
887            return getBoolean(SEPARATE_PROFILE_CHALLENGE_KEY, false, userId);
888        }
889    }
890
891    @Override
892    public void setSeparateProfileChallengeEnabled(int userId, boolean enabled,
893            String managedUserPassword) {
894        checkWritePermission(userId);
895        synchronized (mSeparateChallengeLock) {
896            setSeparateProfileChallengeEnabledLocked(userId, enabled, managedUserPassword);
897        }
898        notifySeparateProfileChallengeChanged(userId);
899    }
900
901    @GuardedBy("mSeparateChallengeLock")
902    private void setSeparateProfileChallengeEnabledLocked(@UserIdInt int userId, boolean enabled,
903            String managedUserPassword) {
904        setBoolean(SEPARATE_PROFILE_CHALLENGE_KEY, enabled, userId);
905        if (enabled) {
906            mStorage.removeChildProfileLock(userId);
907            removeKeystoreProfileKey(userId);
908        } else {
909            tieManagedProfileLockIfNecessary(userId, managedUserPassword);
910        }
911    }
912
913    private void notifySeparateProfileChallengeChanged(int userId) {
914        final DevicePolicyManagerInternal dpmi = LocalServices.getService(
915                DevicePolicyManagerInternal.class);
916        if (dpmi != null) {
917            dpmi.reportSeparateProfileChallengeChanged(userId);
918        }
919    }
920
921    @Override
922    public void setBoolean(String key, boolean value, int userId) {
923        checkWritePermission(userId);
924        setStringUnchecked(key, userId, value ? "1" : "0");
925    }
926
927    @Override
928    public void setLong(String key, long value, int userId) {
929        checkWritePermission(userId);
930        setStringUnchecked(key, userId, Long.toString(value));
931    }
932
933    @Override
934    public void setString(String key, String value, int userId) {
935        checkWritePermission(userId);
936        setStringUnchecked(key, userId, value);
937    }
938
939    private void setStringUnchecked(String key, int userId, String value) {
940        Preconditions.checkArgument(userId != USER_FRP, "cannot store lock settings for FRP user");
941
942        mStorage.writeKeyValue(key, value, userId);
943        if (ArrayUtils.contains(SETTINGS_TO_BACKUP, key)) {
944            BackupManager.dataChanged("com.android.providers.settings");
945        }
946    }
947
948    @Override
949    public boolean getBoolean(String key, boolean defaultValue, int userId) {
950        checkReadPermission(key, userId);
951        String value = getStringUnchecked(key, null, userId);
952        return TextUtils.isEmpty(value) ?
953                defaultValue : (value.equals("1") || value.equals("true"));
954    }
955
956    @Override
957    public long getLong(String key, long defaultValue, int userId) {
958        checkReadPermission(key, userId);
959        String value = getStringUnchecked(key, null, userId);
960        return TextUtils.isEmpty(value) ? defaultValue : Long.parseLong(value);
961    }
962
963    @Override
964    public String getString(String key, String defaultValue, int userId) {
965        checkReadPermission(key, userId);
966        return getStringUnchecked(key, defaultValue, userId);
967    }
968
969    public String getStringUnchecked(String key, String defaultValue, int userId) {
970        if (Settings.Secure.LOCK_PATTERN_ENABLED.equals(key)) {
971            long ident = Binder.clearCallingIdentity();
972            try {
973                return mLockPatternUtils.isLockPatternEnabled(userId) ? "1" : "0";
974            } finally {
975                Binder.restoreCallingIdentity(ident);
976            }
977        }
978
979        if (userId == USER_FRP) {
980            return getFrpStringUnchecked(key);
981        }
982
983        if (LockPatternUtils.LEGACY_LOCK_PATTERN_ENABLED.equals(key)) {
984            key = Settings.Secure.LOCK_PATTERN_ENABLED;
985        }
986
987        return mStorage.readKeyValue(key, defaultValue, userId);
988    }
989
990    private String getFrpStringUnchecked(String key) {
991        if (LockPatternUtils.PASSWORD_TYPE_KEY.equals(key)) {
992            return String.valueOf(readFrpPasswordQuality());
993        }
994        return null;
995    }
996
997    private int readFrpPasswordQuality() {
998        return mStorage.readPersistentDataBlock().qualityForUi;
999    }
1000
1001    @Override
1002    public boolean havePassword(int userId) throws RemoteException {
1003        checkPasswordHavePermission(userId);
1004        synchronized (mSpManager) {
1005            if (isSyntheticPasswordBasedCredentialLocked(userId)) {
1006                long handle = getSyntheticPasswordHandleLocked(userId);
1007                return mSpManager.getCredentialType(handle, userId) ==
1008                        LockPatternUtils.CREDENTIAL_TYPE_PASSWORD;
1009            }
1010        }
1011        // Do we need a permissions check here?
1012        return mStorage.hasPassword(userId);
1013    }
1014
1015    @Override
1016    public boolean havePattern(int userId) throws RemoteException {
1017        checkPasswordHavePermission(userId);
1018        synchronized (mSpManager) {
1019            if (isSyntheticPasswordBasedCredentialLocked(userId)) {
1020                long handle = getSyntheticPasswordHandleLocked(userId);
1021                return mSpManager.getCredentialType(handle, userId) ==
1022                        LockPatternUtils.CREDENTIAL_TYPE_PATTERN;
1023            }
1024        }
1025        // Do we need a permissions check here?
1026        return mStorage.hasPattern(userId);
1027    }
1028
1029    private boolean isUserSecure(int userId) {
1030        synchronized (mSpManager) {
1031            try {
1032                if (isSyntheticPasswordBasedCredentialLocked(userId)) {
1033                    long handle = getSyntheticPasswordHandleLocked(userId);
1034                    return mSpManager.getCredentialType(handle, userId) !=
1035                            LockPatternUtils.CREDENTIAL_TYPE_NONE;
1036                }
1037            } catch (RemoteException e) {
1038                // fall through
1039            }
1040        }
1041        return mStorage.hasCredential(userId);
1042    }
1043
1044    private void setKeystorePassword(String password, int userHandle) {
1045        final KeyStore ks = KeyStore.getInstance();
1046        ks.onUserPasswordChanged(userHandle, password);
1047    }
1048
1049    private void unlockKeystore(String password, int userHandle) {
1050        if (DEBUG) Slog.v(TAG, "Unlock keystore for user: " + userHandle);
1051        final KeyStore ks = KeyStore.getInstance();
1052        ks.unlock(userHandle, password);
1053    }
1054
1055    @VisibleForTesting
1056    protected String getDecryptedPasswordForTiedProfile(int userId)
1057            throws KeyStoreException, UnrecoverableKeyException,
1058            NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException,
1059            InvalidAlgorithmParameterException, IllegalBlockSizeException, BadPaddingException,
1060            CertificateException, IOException {
1061        if (DEBUG) Slog.v(TAG, "Get child profile decrytped key");
1062        byte[] storedData = mStorage.readChildProfileLock(userId);
1063        if (storedData == null) {
1064            throw new FileNotFoundException("Child profile lock file not found");
1065        }
1066        byte[] iv = Arrays.copyOfRange(storedData, 0, PROFILE_KEY_IV_SIZE);
1067        byte[] encryptedPassword = Arrays.copyOfRange(storedData, PROFILE_KEY_IV_SIZE,
1068                storedData.length);
1069        byte[] decryptionResult;
1070        java.security.KeyStore keyStore = java.security.KeyStore.getInstance("AndroidKeyStore");
1071        keyStore.load(null);
1072        SecretKey decryptionKey = (SecretKey) keyStore.getKey(
1073                LockPatternUtils.PROFILE_KEY_NAME_DECRYPT + userId, null);
1074
1075        Cipher cipher = Cipher.getInstance(KeyProperties.KEY_ALGORITHM_AES + "/"
1076                + KeyProperties.BLOCK_MODE_GCM + "/" + KeyProperties.ENCRYPTION_PADDING_NONE);
1077
1078        cipher.init(Cipher.DECRYPT_MODE, decryptionKey, new GCMParameterSpec(128, iv));
1079        decryptionResult = cipher.doFinal(encryptedPassword);
1080        return new String(decryptionResult, StandardCharsets.UTF_8);
1081    }
1082
1083    private void unlockChildProfile(int profileHandle, boolean ignoreUserNotAuthenticated)
1084            throws RemoteException {
1085        try {
1086            doVerifyCredential(getDecryptedPasswordForTiedProfile(profileHandle),
1087                    LockPatternUtils.CREDENTIAL_TYPE_PASSWORD,
1088                    false, 0 /* no challenge */, profileHandle, null /* progressCallback */);
1089        } catch (UnrecoverableKeyException | InvalidKeyException | KeyStoreException
1090                | NoSuchAlgorithmException | NoSuchPaddingException
1091                | InvalidAlgorithmParameterException | IllegalBlockSizeException
1092                | BadPaddingException | CertificateException | IOException e) {
1093            if (e instanceof FileNotFoundException) {
1094                Slog.i(TAG, "Child profile key not found");
1095            } else if (ignoreUserNotAuthenticated && e instanceof UserNotAuthenticatedException) {
1096                Slog.i(TAG, "Parent keystore seems locked, ignoring");
1097            } else {
1098                Slog.e(TAG, "Failed to decrypt child profile key", e);
1099            }
1100        }
1101    }
1102
1103    private void unlockUser(int userId, byte[] token, byte[] secret) {
1104        // TODO: make this method fully async so we can update UI with progress strings
1105        final CountDownLatch latch = new CountDownLatch(1);
1106        final IProgressListener listener = new IProgressListener.Stub() {
1107            @Override
1108            public void onStarted(int id, Bundle extras) throws RemoteException {
1109                Log.d(TAG, "unlockUser started");
1110            }
1111
1112            @Override
1113            public void onProgress(int id, int progress, Bundle extras) throws RemoteException {
1114                Log.d(TAG, "unlockUser progress " + progress);
1115            }
1116
1117            @Override
1118            public void onFinished(int id, Bundle extras) throws RemoteException {
1119                Log.d(TAG, "unlockUser finished");
1120                latch.countDown();
1121            }
1122        };
1123
1124        try {
1125            mActivityManager.unlockUser(userId, token, secret, listener);
1126        } catch (RemoteException e) {
1127            throw e.rethrowAsRuntimeException();
1128        }
1129
1130        try {
1131            latch.await(15, TimeUnit.SECONDS);
1132        } catch (InterruptedException e) {
1133            Thread.currentThread().interrupt();
1134        }
1135        try {
1136            if (!mUserManager.getUserInfo(userId).isManagedProfile()) {
1137                final List<UserInfo> profiles = mUserManager.getProfiles(userId);
1138                for (UserInfo pi : profiles) {
1139                    // Unlock managed profile with unified lock
1140                    if (tiedManagedProfileReadyToUnlock(pi)) {
1141                        unlockChildProfile(pi.id, false /* ignoreUserNotAuthenticated */);
1142                    }
1143                }
1144            }
1145        } catch (RemoteException e) {
1146            Log.d(TAG, "Failed to unlock child profile", e);
1147        }
1148    }
1149
1150    private boolean tiedManagedProfileReadyToUnlock(UserInfo userInfo) {
1151        return userInfo.isManagedProfile()
1152                && !mLockPatternUtils.isSeparateProfileChallengeEnabled(userInfo.id)
1153                && mStorage.hasChildProfileLock(userInfo.id)
1154                && mUserManager.isUserRunning(userInfo.id);
1155    }
1156
1157    private Map<Integer, String> getDecryptedPasswordsForAllTiedProfiles(int userId) {
1158        if (mUserManager.getUserInfo(userId).isManagedProfile()) {
1159            return null;
1160        }
1161        Map<Integer, String> result = new ArrayMap<Integer, String>();
1162        final List<UserInfo> profiles = mUserManager.getProfiles(userId);
1163        final int size = profiles.size();
1164        for (int i = 0; i < size; i++) {
1165            final UserInfo profile = profiles.get(i);
1166            if (!profile.isManagedProfile()) {
1167                continue;
1168            }
1169            final int managedUserId = profile.id;
1170            if (mLockPatternUtils.isSeparateProfileChallengeEnabled(managedUserId)) {
1171                continue;
1172            }
1173            try {
1174                result.put(managedUserId, getDecryptedPasswordForTiedProfile(managedUserId));
1175            } catch (KeyStoreException | UnrecoverableKeyException | NoSuchAlgorithmException
1176                    | NoSuchPaddingException | InvalidKeyException
1177                    | InvalidAlgorithmParameterException | IllegalBlockSizeException
1178                    | BadPaddingException | CertificateException | IOException e) {
1179                Slog.e(TAG, "getDecryptedPasswordsForAllTiedProfiles failed for user " +
1180                    managedUserId, e);
1181            }
1182        }
1183        return result;
1184    }
1185
1186    /**
1187     * Synchronize all profile's work challenge of the given user if it's unified: tie or clear them
1188     * depending on the parent user's secure state.
1189     *
1190     * When clearing tied work challenges, a pre-computed password table for profiles are required,
1191     * since changing password for profiles requires existing password, and existing passwords can
1192     * only be computed before the parent user's password is cleared.
1193     *
1194     * Strictly this is a recursive function, since setLockCredentialInternal ends up calling this
1195     * method again on profiles. However the recursion is guaranteed to terminate as this method
1196     * terminates when the user is a managed profile.
1197     */
1198    private void synchronizeUnifiedWorkChallengeForProfiles(int userId,
1199            Map<Integer, String> profilePasswordMap) throws RemoteException {
1200        if (mUserManager.getUserInfo(userId).isManagedProfile()) {
1201            return;
1202        }
1203        final boolean isSecure = isUserSecure(userId);
1204        final List<UserInfo> profiles = mUserManager.getProfiles(userId);
1205        final int size = profiles.size();
1206        for (int i = 0; i < size; i++) {
1207            final UserInfo profile = profiles.get(i);
1208            if (profile.isManagedProfile()) {
1209                final int managedUserId = profile.id;
1210                if (mLockPatternUtils.isSeparateProfileChallengeEnabled(managedUserId)) {
1211                    continue;
1212                }
1213                if (isSecure) {
1214                    tieManagedProfileLockIfNecessary(managedUserId, null);
1215                } else {
1216                    // We use cached work profile password computed before clearing the parent's
1217                    // credential, otherwise they get lost
1218                    if (profilePasswordMap != null && profilePasswordMap.containsKey(managedUserId)) {
1219                        setLockCredentialInternal(null, LockPatternUtils.CREDENTIAL_TYPE_NONE,
1220                                profilePasswordMap.get(managedUserId),
1221                                DevicePolicyManager.PASSWORD_QUALITY_UNSPECIFIED, managedUserId);
1222                    } else {
1223                        Slog.wtf(TAG, "clear tied profile challenges, but no password supplied.");
1224                        // Supplying null here would lead to untrusted credential change
1225                        setLockCredentialInternal(null, LockPatternUtils.CREDENTIAL_TYPE_NONE, null,
1226                                DevicePolicyManager.PASSWORD_QUALITY_UNSPECIFIED, managedUserId);
1227                    }
1228                    mStorage.removeChildProfileLock(managedUserId);
1229                    removeKeystoreProfileKey(managedUserId);
1230                }
1231            }
1232        }
1233    }
1234
1235    private boolean isManagedProfileWithUnifiedLock(int userId) {
1236        return mUserManager.getUserInfo(userId).isManagedProfile()
1237                && !mLockPatternUtils.isSeparateProfileChallengeEnabled(userId);
1238    }
1239
1240    private boolean isManagedProfileWithSeparatedLock(int userId) {
1241        return mUserManager.getUserInfo(userId).isManagedProfile()
1242                && mLockPatternUtils.isSeparateProfileChallengeEnabled(userId);
1243    }
1244
1245    // This method should be called by LockPatternUtil only, all internal methods in this class
1246    // should call setLockCredentialInternal.
1247    @Override
1248    public void setLockCredential(String credential, int type, String savedCredential,
1249            int requestedQuality, int userId)
1250            throws RemoteException {
1251        checkWritePermission(userId);
1252        synchronized (mSeparateChallengeLock) {
1253            setLockCredentialInternal(credential, type, savedCredential, requestedQuality, userId);
1254            setSeparateProfileChallengeEnabledLocked(userId, true, null);
1255            notifyPasswordChanged(userId);
1256        }
1257        notifySeparateProfileChallengeChanged(userId);
1258    }
1259
1260    private void setLockCredentialInternal(String credential, int credentialType,
1261            String savedCredential, int requestedQuality, int userId) throws RemoteException {
1262        // Normalize savedCredential and credential such that empty string is always represented
1263        // as null.
1264        if (TextUtils.isEmpty(savedCredential)) {
1265            savedCredential = null;
1266        }
1267        if (TextUtils.isEmpty(credential)) {
1268            credential = null;
1269        }
1270        synchronized (mSpManager) {
1271            if (isSyntheticPasswordBasedCredentialLocked(userId)) {
1272                spBasedSetLockCredentialInternalLocked(credential, credentialType, savedCredential,
1273                        requestedQuality, userId);
1274                return;
1275            }
1276        }
1277
1278        if (credentialType == LockPatternUtils.CREDENTIAL_TYPE_NONE) {
1279            if (credential != null) {
1280                Slog.wtf(TAG, "CredentialType is none, but credential is non-null.");
1281            }
1282            clearUserKeyProtection(userId);
1283            getGateKeeperService().clearSecureUserId(userId);
1284            mStorage.writeCredentialHash(CredentialHash.createEmptyHash(), userId);
1285            setKeystorePassword(null, userId);
1286            fixateNewestUserKeyAuth(userId);
1287            synchronizeUnifiedWorkChallengeForProfiles(userId, null);
1288            notifyActivePasswordMetricsAvailable(null, userId);
1289            mRecoverableKeyStoreManager.lockScreenSecretChanged(credentialType, credential, userId);
1290            return;
1291        }
1292        if (credential == null) {
1293            throw new RemoteException("Null credential with mismatched credential type");
1294        }
1295
1296        CredentialHash currentHandle = mStorage.readCredentialHash(userId);
1297        if (isManagedProfileWithUnifiedLock(userId)) {
1298            // get credential from keystore when managed profile has unified lock
1299            if (savedCredential == null) {
1300                try {
1301                    savedCredential = getDecryptedPasswordForTiedProfile(userId);
1302                } catch (FileNotFoundException e) {
1303                    Slog.i(TAG, "Child profile key not found");
1304                } catch (UnrecoverableKeyException | InvalidKeyException | KeyStoreException
1305                        | NoSuchAlgorithmException | NoSuchPaddingException
1306                        | InvalidAlgorithmParameterException | IllegalBlockSizeException
1307                        | BadPaddingException | CertificateException | IOException e) {
1308                    Slog.e(TAG, "Failed to decrypt child profile key", e);
1309                }
1310            }
1311        } else {
1312            if (currentHandle.hash == null) {
1313                if (savedCredential != null) {
1314                    Slog.w(TAG, "Saved credential provided, but none stored");
1315                }
1316                savedCredential = null;
1317            }
1318        }
1319        synchronized (mSpManager) {
1320            if (shouldMigrateToSyntheticPasswordLocked(userId)) {
1321                initializeSyntheticPasswordLocked(currentHandle.hash, savedCredential,
1322                        currentHandle.type, requestedQuality, userId);
1323                spBasedSetLockCredentialInternalLocked(credential, credentialType, savedCredential,
1324                        requestedQuality, userId);
1325                return;
1326            }
1327        }
1328        if (DEBUG) Slog.d(TAG, "setLockCredentialInternal: user=" + userId);
1329        byte[] enrolledHandle = enrollCredential(currentHandle.hash, savedCredential, credential,
1330                userId);
1331        if (enrolledHandle != null) {
1332            CredentialHash willStore = CredentialHash.create(enrolledHandle, credentialType);
1333            mStorage.writeCredentialHash(willStore, userId);
1334            // push new secret and auth token to vold
1335            GateKeeperResponse gkResponse = getGateKeeperService()
1336                    .verifyChallenge(userId, 0, willStore.hash, credential.getBytes());
1337            setUserKeyProtection(userId, credential, convertResponse(gkResponse));
1338            fixateNewestUserKeyAuth(userId);
1339            mRecoverableKeyStoreManager.lockScreenSecretChanged(credentialType, credential,
1340                userId);
1341            // Refresh the auth token
1342            doVerifyCredential(credential, credentialType, true, 0, userId, null /* progressCallback */);
1343            synchronizeUnifiedWorkChallengeForProfiles(userId, null);
1344        } else {
1345            throw new RemoteException("Failed to enroll " +
1346                    (credentialType == LockPatternUtils.CREDENTIAL_TYPE_PASSWORD ? "password"
1347                            : "pattern"));
1348        }
1349    }
1350
1351    private VerifyCredentialResponse convertResponse(GateKeeperResponse gateKeeperResponse) {
1352        return VerifyCredentialResponse.fromGateKeeperResponse(gateKeeperResponse);
1353    }
1354
1355    @VisibleForTesting
1356    protected void tieProfileLockToParent(int userId, String password) {
1357        if (DEBUG) Slog.v(TAG, "tieProfileLockToParent for user: " + userId);
1358        byte[] randomLockSeed = password.getBytes(StandardCharsets.UTF_8);
1359        byte[] encryptionResult;
1360        byte[] iv;
1361        try {
1362            KeyGenerator keyGenerator = KeyGenerator.getInstance(KeyProperties.KEY_ALGORITHM_AES);
1363            keyGenerator.init(new SecureRandom());
1364            SecretKey secretKey = keyGenerator.generateKey();
1365            java.security.KeyStore keyStore = java.security.KeyStore.getInstance("AndroidKeyStore");
1366            keyStore.load(null);
1367            try {
1368                keyStore.setEntry(
1369                        LockPatternUtils.PROFILE_KEY_NAME_ENCRYPT + userId,
1370                        new java.security.KeyStore.SecretKeyEntry(secretKey),
1371                        new KeyProtection.Builder(KeyProperties.PURPOSE_ENCRYPT)
1372                                .setBlockModes(KeyProperties.BLOCK_MODE_GCM)
1373                                .setEncryptionPaddings(KeyProperties.ENCRYPTION_PADDING_NONE)
1374                                .build());
1375                keyStore.setEntry(
1376                        LockPatternUtils.PROFILE_KEY_NAME_DECRYPT + userId,
1377                        new java.security.KeyStore.SecretKeyEntry(secretKey),
1378                        new KeyProtection.Builder(KeyProperties.PURPOSE_DECRYPT)
1379                                .setBlockModes(KeyProperties.BLOCK_MODE_GCM)
1380                                .setEncryptionPaddings(KeyProperties.ENCRYPTION_PADDING_NONE)
1381                                .setUserAuthenticationRequired(true)
1382                                .setUserAuthenticationValidityDurationSeconds(30)
1383                                .setCriticalToDeviceEncryption(true)
1384                                .build());
1385                // Key imported, obtain a reference to it.
1386                SecretKey keyStoreEncryptionKey = (SecretKey) keyStore.getKey(
1387                        LockPatternUtils.PROFILE_KEY_NAME_ENCRYPT + userId, null);
1388                Cipher cipher = Cipher.getInstance(
1389                        KeyProperties.KEY_ALGORITHM_AES + "/" + KeyProperties.BLOCK_MODE_GCM + "/"
1390                                + KeyProperties.ENCRYPTION_PADDING_NONE);
1391                cipher.init(Cipher.ENCRYPT_MODE, keyStoreEncryptionKey);
1392                encryptionResult = cipher.doFinal(randomLockSeed);
1393                iv = cipher.getIV();
1394            } finally {
1395                // The original key can now be discarded.
1396                keyStore.deleteEntry(LockPatternUtils.PROFILE_KEY_NAME_ENCRYPT + userId);
1397            }
1398        } catch (CertificateException | UnrecoverableKeyException
1399                | IOException | BadPaddingException | IllegalBlockSizeException | KeyStoreException
1400                | NoSuchPaddingException | NoSuchAlgorithmException | InvalidKeyException e) {
1401            throw new RuntimeException("Failed to encrypt key", e);
1402        }
1403        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
1404        try {
1405            if (iv.length != PROFILE_KEY_IV_SIZE) {
1406                throw new RuntimeException("Invalid iv length: " + iv.length);
1407            }
1408            outputStream.write(iv);
1409            outputStream.write(encryptionResult);
1410        } catch (IOException e) {
1411            throw new RuntimeException("Failed to concatenate byte arrays", e);
1412        }
1413        mStorage.writeChildProfileLock(userId, outputStream.toByteArray());
1414    }
1415
1416    private byte[] enrollCredential(byte[] enrolledHandle,
1417            String enrolledCredential, String toEnroll, int userId)
1418            throws RemoteException {
1419        checkWritePermission(userId);
1420        byte[] enrolledCredentialBytes = enrolledCredential == null
1421                ? null
1422                : enrolledCredential.getBytes();
1423        byte[] toEnrollBytes = toEnroll == null
1424                ? null
1425                : toEnroll.getBytes();
1426        GateKeeperResponse response = getGateKeeperService().enroll(userId, enrolledHandle,
1427                enrolledCredentialBytes, toEnrollBytes);
1428
1429        if (response == null) {
1430            return null;
1431        }
1432
1433        byte[] hash = response.getPayload();
1434        if (hash != null) {
1435            setKeystorePassword(toEnroll, userId);
1436        } else {
1437            // Should not happen
1438            Slog.e(TAG, "Throttled while enrolling a password");
1439        }
1440        return hash;
1441    }
1442
1443    private void setAuthlessUserKeyProtection(int userId, byte[] key) throws RemoteException {
1444        if (DEBUG) Slog.d(TAG, "setAuthlessUserKeyProtectiond: user=" + userId);
1445        addUserKeyAuth(userId, null, key);
1446    }
1447
1448    private void setUserKeyProtection(int userId, String credential, VerifyCredentialResponse vcr)
1449            throws RemoteException {
1450        if (DEBUG) Slog.d(TAG, "setUserKeyProtection: user=" + userId);
1451        if (vcr == null) {
1452            throw new RemoteException("Null response verifying a credential we just set");
1453        }
1454        if (vcr.getResponseCode() != VerifyCredentialResponse.RESPONSE_OK) {
1455            throw new RemoteException("Non-OK response verifying a credential we just set: "
1456                    + vcr.getResponseCode());
1457        }
1458        byte[] token = vcr.getPayload();
1459        if (token == null) {
1460            throw new RemoteException("Empty payload verifying a credential we just set");
1461        }
1462        addUserKeyAuth(userId, token, secretFromCredential(credential));
1463    }
1464
1465    private void clearUserKeyProtection(int userId) throws RemoteException {
1466        if (DEBUG) Slog.d(TAG, "clearUserKeyProtection user=" + userId);
1467        addUserKeyAuth(userId, null, null);
1468    }
1469
1470    private static byte[] secretFromCredential(String credential) throws RemoteException {
1471        try {
1472            MessageDigest digest = MessageDigest.getInstance("SHA-512");
1473            // Personalize the hash
1474            byte[] personalization = "Android FBE credential hash"
1475                    .getBytes(StandardCharsets.UTF_8);
1476            // Pad it to the block size of the hash function
1477            personalization = Arrays.copyOf(personalization, 128);
1478            digest.update(personalization);
1479            digest.update(credential.getBytes(StandardCharsets.UTF_8));
1480            return digest.digest();
1481        } catch (NoSuchAlgorithmException e) {
1482            throw new RuntimeException("NoSuchAlgorithmException for SHA-512");
1483        }
1484    }
1485
1486    private void addUserKeyAuth(int userId, byte[] token, byte[] secret)
1487            throws RemoteException {
1488        final UserInfo userInfo = mUserManager.getUserInfo(userId);
1489        final IStorageManager storageManager = mInjector.getStorageManager();
1490        final long callingId = Binder.clearCallingIdentity();
1491        try {
1492            storageManager.addUserKeyAuth(userId, userInfo.serialNumber, token, secret);
1493        } finally {
1494            Binder.restoreCallingIdentity(callingId);
1495        }
1496    }
1497
1498    private void fixateNewestUserKeyAuth(int userId)
1499            throws RemoteException {
1500        if (DEBUG) Slog.d(TAG, "fixateNewestUserKeyAuth: user=" + userId);
1501        final IStorageManager storageManager = mInjector.getStorageManager();
1502        final long callingId = Binder.clearCallingIdentity();
1503        try {
1504            storageManager.fixateNewestUserKeyAuth(userId);
1505        } finally {
1506            Binder.restoreCallingIdentity(callingId);
1507        }
1508    }
1509
1510    @Override
1511    public void resetKeyStore(int userId) throws RemoteException {
1512        checkWritePermission(userId);
1513        if (DEBUG) Slog.v(TAG, "Reset keystore for user: " + userId);
1514        int managedUserId = -1;
1515        String managedUserDecryptedPassword = null;
1516        final List<UserInfo> profiles = mUserManager.getProfiles(userId);
1517        for (UserInfo pi : profiles) {
1518            // Unlock managed profile with unified lock
1519            if (pi.isManagedProfile()
1520                    && !mLockPatternUtils.isSeparateProfileChallengeEnabled(pi.id)
1521                    && mStorage.hasChildProfileLock(pi.id)) {
1522                try {
1523                    if (managedUserId == -1) {
1524                        managedUserDecryptedPassword = getDecryptedPasswordForTiedProfile(pi.id);
1525                        managedUserId = pi.id;
1526                    } else {
1527                        // Should not happen
1528                        Slog.e(TAG, "More than one managed profile, uid1:" + managedUserId
1529                                + ", uid2:" + pi.id);
1530                    }
1531                } catch (UnrecoverableKeyException | InvalidKeyException | KeyStoreException
1532                        | NoSuchAlgorithmException | NoSuchPaddingException
1533                        | InvalidAlgorithmParameterException | IllegalBlockSizeException
1534                        | BadPaddingException | CertificateException | IOException e) {
1535                    Slog.e(TAG, "Failed to decrypt child profile key", e);
1536                }
1537            }
1538        }
1539        try {
1540            // Clear all the users credentials could have been installed in for this user.
1541            for (int profileId : mUserManager.getProfileIdsWithDisabled(userId)) {
1542                for (int uid : SYSTEM_CREDENTIAL_UIDS) {
1543                    mKeyStore.clearUid(UserHandle.getUid(profileId, uid));
1544                }
1545            }
1546        } finally {
1547            if (managedUserId != -1 && managedUserDecryptedPassword != null) {
1548                if (DEBUG) Slog.v(TAG, "Restore tied profile lock");
1549                tieProfileLockToParent(managedUserId, managedUserDecryptedPassword);
1550            }
1551        }
1552    }
1553
1554    @Override
1555    public VerifyCredentialResponse checkCredential(String credential, int type, int userId,
1556            ICheckCredentialProgressCallback progressCallback) throws RemoteException {
1557        checkPasswordReadPermission(userId);
1558        return doVerifyCredential(credential, type, false, 0, userId, progressCallback);
1559    }
1560
1561    @Override
1562    public VerifyCredentialResponse verifyCredential(String credential, int type, long challenge,
1563            int userId) throws RemoteException {
1564        checkPasswordReadPermission(userId);
1565        return doVerifyCredential(credential, type, true, challenge, userId,
1566                null /* progressCallback */);
1567    }
1568
1569    /**
1570     * Verify user credential and unlock the user. Fix pattern bug by deprecating the old base zero
1571     * format.
1572     */
1573    private VerifyCredentialResponse doVerifyCredential(String credential, int credentialType,
1574            boolean hasChallenge, long challenge, int userId,
1575            ICheckCredentialProgressCallback progressCallback) throws RemoteException {
1576        if (TextUtils.isEmpty(credential)) {
1577            throw new IllegalArgumentException("Credential can't be null or empty");
1578        }
1579        if (userId == USER_FRP && Settings.Global.getInt(mContext.getContentResolver(),
1580                Settings.Global.DEVICE_PROVISIONED, 0) != 0) {
1581            Slog.e(TAG, "FRP credential can only be verified prior to provisioning.");
1582            return VerifyCredentialResponse.ERROR;
1583        }
1584        VerifyCredentialResponse response = null;
1585        response = spBasedDoVerifyCredential(credential, credentialType, hasChallenge, challenge,
1586                userId, progressCallback);
1587        // The user employs synthetic password based credential.
1588        if (response != null) {
1589            mRecoverableKeyStoreManager.lockScreenSecretAvailable(credentialType, credential,
1590                    userId);
1591            return response;
1592        }
1593
1594        if (userId == USER_FRP) {
1595            Slog.wtf(TAG, "Unexpected FRP credential type, should be SP based.");
1596            return VerifyCredentialResponse.ERROR;
1597        }
1598
1599        final CredentialHash storedHash = mStorage.readCredentialHash(userId);
1600        if (storedHash.type != credentialType) {
1601            Slog.wtf(TAG, "doVerifyCredential type mismatch with stored credential??"
1602                    + " stored: " + storedHash.type + " passed in: " + credentialType);
1603            return VerifyCredentialResponse.ERROR;
1604        }
1605
1606        boolean shouldReEnrollBaseZero = storedHash.type == LockPatternUtils.CREDENTIAL_TYPE_PATTERN
1607                && storedHash.isBaseZeroPattern;
1608
1609        String credentialToVerify;
1610        if (shouldReEnrollBaseZero) {
1611            credentialToVerify = LockPatternUtils.patternStringToBaseZero(credential);
1612        } else {
1613            credentialToVerify = credential;
1614        }
1615
1616        response = verifyCredential(userId, storedHash, credentialToVerify,
1617                hasChallenge, challenge, progressCallback);
1618
1619        if (response.getResponseCode() == VerifyCredentialResponse.RESPONSE_OK) {
1620            mStrongAuth.reportSuccessfulStrongAuthUnlock(userId);
1621            if (shouldReEnrollBaseZero) {
1622                setLockCredentialInternal(credential, storedHash.type, credentialToVerify,
1623                        DevicePolicyManager.PASSWORD_QUALITY_SOMETHING, userId);
1624            }
1625        }
1626
1627        return response;
1628    }
1629
1630    @Override
1631    public VerifyCredentialResponse verifyTiedProfileChallenge(String credential, int type,
1632            long challenge, int userId) throws RemoteException {
1633        checkPasswordReadPermission(userId);
1634        if (!isManagedProfileWithUnifiedLock(userId)) {
1635            throw new RemoteException("User id must be managed profile with unified lock");
1636        }
1637        final int parentProfileId = mUserManager.getProfileParent(userId).id;
1638        // Unlock parent by using parent's challenge
1639        final VerifyCredentialResponse parentResponse = doVerifyCredential(
1640                credential,
1641                type,
1642                true /* hasChallenge */,
1643                challenge,
1644                parentProfileId,
1645                null /* progressCallback */);
1646        if (parentResponse.getResponseCode() != VerifyCredentialResponse.RESPONSE_OK) {
1647            // Failed, just return parent's response
1648            return parentResponse;
1649        }
1650
1651        try {
1652            // Unlock work profile, and work profile with unified lock must use password only
1653            return doVerifyCredential(getDecryptedPasswordForTiedProfile(userId),
1654                    LockPatternUtils.CREDENTIAL_TYPE_PASSWORD,
1655                    true,
1656                    challenge,
1657                    userId, null /* progressCallback */);
1658        } catch (UnrecoverableKeyException | InvalidKeyException | KeyStoreException
1659                | NoSuchAlgorithmException | NoSuchPaddingException
1660                | InvalidAlgorithmParameterException | IllegalBlockSizeException
1661                | BadPaddingException | CertificateException | IOException e) {
1662            Slog.e(TAG, "Failed to decrypt child profile key", e);
1663            throw new RemoteException("Unable to get tied profile token");
1664        }
1665    }
1666
1667    /**
1668     * Lowest-level credential verification routine that talks to GateKeeper. If verification
1669     * passes, unlock the corresponding user and keystore. Also handles the migration from legacy
1670     * hash to GK.
1671     */
1672    private VerifyCredentialResponse verifyCredential(int userId, CredentialHash storedHash,
1673            String credential, boolean hasChallenge, long challenge,
1674            ICheckCredentialProgressCallback progressCallback) throws RemoteException {
1675        if ((storedHash == null || storedHash.hash.length == 0) && TextUtils.isEmpty(credential)) {
1676            // don't need to pass empty credentials to GateKeeper
1677            return VerifyCredentialResponse.OK;
1678        }
1679
1680        if (storedHash == null || TextUtils.isEmpty(credential)) {
1681            return VerifyCredentialResponse.ERROR;
1682        }
1683
1684        // We're potentially going to be doing a bunch of disk I/O below as part
1685        // of unlocking the user, so yell if calling from the main thread.
1686        StrictMode.noteDiskRead();
1687
1688        if (storedHash.version == CredentialHash.VERSION_LEGACY) {
1689            final byte[] hash;
1690            if (storedHash.type == LockPatternUtils.CREDENTIAL_TYPE_PATTERN) {
1691                hash = LockPatternUtils.patternToHash(LockPatternUtils.stringToPattern(credential));
1692            } else {
1693                hash = mLockPatternUtils.passwordToHash(credential, userId);
1694            }
1695            if (Arrays.equals(hash, storedHash.hash)) {
1696                if (storedHash.type == LockPatternUtils.CREDENTIAL_TYPE_PATTERN) {
1697                    unlockKeystore(LockPatternUtils.patternStringToBaseZero(credential), userId);
1698                } else {
1699                    unlockKeystore(credential, userId);
1700                }
1701                // Users with legacy credentials don't have credential-backed
1702                // FBE keys, so just pass through a fake token/secret
1703                Slog.i(TAG, "Unlocking user with fake token: " + userId);
1704                final byte[] fakeToken = String.valueOf(userId).getBytes();
1705                unlockUser(userId, fakeToken, fakeToken);
1706
1707                // migrate credential to GateKeeper
1708                setLockCredentialInternal(credential, storedHash.type, null,
1709                        storedHash.type == LockPatternUtils.CREDENTIAL_TYPE_PATTERN
1710                                ? DevicePolicyManager.PASSWORD_QUALITY_SOMETHING
1711                                : DevicePolicyManager.PASSWORD_QUALITY_ALPHANUMERIC
1712                                /* TODO(roosa): keep the same password quality */, userId);
1713                if (!hasChallenge) {
1714                    notifyActivePasswordMetricsAvailable(credential, userId);
1715                    // Use credentials to create recoverable keystore snapshot.
1716                    mRecoverableKeyStoreManager.lockScreenSecretAvailable(
1717                            storedHash.type, credential, userId);
1718                    return VerifyCredentialResponse.OK;
1719                }
1720                // Fall through to get the auth token. Technically this should never happen,
1721                // as a user that had a legacy credential would have to unlock their device
1722                // before getting to a flow with a challenge, but supporting for consistency.
1723            } else {
1724                return VerifyCredentialResponse.ERROR;
1725            }
1726        }
1727        GateKeeperResponse gateKeeperResponse = getGateKeeperService()
1728                .verifyChallenge(userId, challenge, storedHash.hash, credential.getBytes());
1729        VerifyCredentialResponse response = convertResponse(gateKeeperResponse);
1730        boolean shouldReEnroll = gateKeeperResponse.getShouldReEnroll();
1731
1732        if (response.getResponseCode() == VerifyCredentialResponse.RESPONSE_OK) {
1733
1734            // credential has matched
1735
1736            if (progressCallback != null) {
1737                progressCallback.onCredentialVerified();
1738            }
1739            notifyActivePasswordMetricsAvailable(credential, userId);
1740            unlockKeystore(credential, userId);
1741
1742            Slog.i(TAG, "Unlocking user " + userId + " with token length "
1743                    + response.getPayload().length);
1744            unlockUser(userId, response.getPayload(), secretFromCredential(credential));
1745
1746            if (isManagedProfileWithSeparatedLock(userId)) {
1747                TrustManager trustManager =
1748                        (TrustManager) mContext.getSystemService(Context.TRUST_SERVICE);
1749                trustManager.setDeviceLockedForUser(userId, false);
1750            }
1751            int reEnrollQuality = storedHash.type == LockPatternUtils.CREDENTIAL_TYPE_PATTERN
1752                    ? DevicePolicyManager.PASSWORD_QUALITY_SOMETHING
1753                    : DevicePolicyManager.PASSWORD_QUALITY_ALPHANUMERIC
1754                    /* TODO(roosa): keep the same password quality */;
1755            if (shouldReEnroll) {
1756                setLockCredentialInternal(credential, storedHash.type, credential,
1757                        reEnrollQuality, userId);
1758            } else {
1759                // Now that we've cleared of all required GK migration, let's do the final
1760                // migration to synthetic password.
1761                synchronized (mSpManager) {
1762                    if (shouldMigrateToSyntheticPasswordLocked(userId)) {
1763                        AuthenticationToken auth = initializeSyntheticPasswordLocked(
1764                                storedHash.hash, credential, storedHash.type, reEnrollQuality,
1765                                userId);
1766                        activateEscrowTokens(auth, userId);
1767                    }
1768                }
1769            }
1770            // Use credentials to create recoverable keystore snapshot.
1771            mRecoverableKeyStoreManager.lockScreenSecretAvailable(storedHash.type, credential,
1772                userId);
1773
1774        } else if (response.getResponseCode() == VerifyCredentialResponse.RESPONSE_RETRY) {
1775            if (response.getTimeout() > 0) {
1776                requireStrongAuth(STRONG_AUTH_REQUIRED_AFTER_LOCKOUT, userId);
1777            }
1778        }
1779
1780        return response;
1781    }
1782
1783    /**
1784     * Call this method to notify DPMS regarding the latest password metric. This should be called
1785     * when the user is authenticating or when a new password is being set.
1786     */
1787    private void notifyActivePasswordMetricsAvailable(String password, @UserIdInt int userId) {
1788        final PasswordMetrics metrics;
1789        if (password == null) {
1790            metrics = new PasswordMetrics();
1791        } else {
1792            metrics = PasswordMetrics.computeForPassword(password);
1793            metrics.quality = mLockPatternUtils.getKeyguardStoredPasswordQuality(userId);
1794        }
1795
1796        // Asynchronous to avoid dead lock
1797        mHandler.post(() -> {
1798            DevicePolicyManager dpm = (DevicePolicyManager)
1799                    mContext.getSystemService(Context.DEVICE_POLICY_SERVICE);
1800            dpm.setActivePasswordState(metrics, userId);
1801        });
1802    }
1803
1804    /**
1805     * Call after {@link #notifyActivePasswordMetricsAvailable} so metrics are updated before
1806     * reporting the password changed.
1807     */
1808    private void notifyPasswordChanged(@UserIdInt int userId) {
1809        // Same handler as notifyActivePasswordMetricsAvailable to ensure correct ordering
1810        mHandler.post(() -> {
1811            DevicePolicyManager dpm = (DevicePolicyManager)
1812                    mContext.getSystemService(Context.DEVICE_POLICY_SERVICE);
1813            dpm.reportPasswordChanged(userId);
1814        });
1815    }
1816
1817    @Override
1818    public boolean checkVoldPassword(int userId) throws RemoteException {
1819        if (!mFirstCallToVold) {
1820            return false;
1821        }
1822        mFirstCallToVold = false;
1823
1824        checkPasswordReadPermission(userId);
1825
1826        // There's no guarantee that this will safely connect, but if it fails
1827        // we will simply show the lock screen when we shouldn't, so relatively
1828        // benign. There is an outside chance something nasty would happen if
1829        // this service restarted before vold stales out the password in this
1830        // case. The nastiness is limited to not showing the lock screen when
1831        // we should, within the first minute of decrypting the phone if this
1832        // service can't connect to vold, it restarts, and then the new instance
1833        // does successfully connect.
1834        final IStorageManager service = mInjector.getStorageManager();
1835        String password;
1836        long identity = Binder.clearCallingIdentity();
1837        try {
1838            password = service.getPassword();
1839            service.clearPassword();
1840        } finally {
1841            Binder.restoreCallingIdentity(identity);
1842        }
1843        if (password == null) {
1844            return false;
1845        }
1846
1847        try {
1848            if (mLockPatternUtils.isLockPatternEnabled(userId)) {
1849                if (checkCredential(password, LockPatternUtils.CREDENTIAL_TYPE_PATTERN, userId,
1850                        null /* progressCallback */)
1851                                .getResponseCode() == GateKeeperResponse.RESPONSE_OK) {
1852                    return true;
1853                }
1854            }
1855        } catch (Exception e) {
1856        }
1857
1858        try {
1859            if (mLockPatternUtils.isLockPasswordEnabled(userId)) {
1860                if (checkCredential(password, LockPatternUtils.CREDENTIAL_TYPE_PASSWORD, userId,
1861                        null /* progressCallback */)
1862                                .getResponseCode() == GateKeeperResponse.RESPONSE_OK) {
1863                    return true;
1864                }
1865            }
1866        } catch (Exception e) {
1867        }
1868
1869        return false;
1870    }
1871
1872    private void removeUser(int userId, boolean unknownUser) {
1873        mSpManager.removeUser(userId);
1874        mStorage.removeUser(userId);
1875        mStrongAuth.removeUser(userId);
1876        cleanSpCache();
1877
1878        final KeyStore ks = KeyStore.getInstance();
1879        ks.onUserRemoved(userId);
1880
1881        try {
1882            final IGateKeeperService gk = getGateKeeperService();
1883            if (gk != null) {
1884                gk.clearSecureUserId(userId);
1885            }
1886        } catch (RemoteException ex) {
1887            Slog.w(TAG, "unable to clear GK secure user id");
1888        }
1889        if (unknownUser || mUserManager.getUserInfo(userId).isManagedProfile()) {
1890            removeKeystoreProfileKey(userId);
1891        }
1892    }
1893
1894    private void removeKeystoreProfileKey(int targetUserId) {
1895        if (DEBUG) Slog.v(TAG, "Remove keystore profile key for user: " + targetUserId);
1896        try {
1897            java.security.KeyStore keyStore = java.security.KeyStore.getInstance("AndroidKeyStore");
1898            keyStore.load(null);
1899            keyStore.deleteEntry(LockPatternUtils.PROFILE_KEY_NAME_ENCRYPT + targetUserId);
1900            keyStore.deleteEntry(LockPatternUtils.PROFILE_KEY_NAME_DECRYPT + targetUserId);
1901        } catch (KeyStoreException | NoSuchAlgorithmException | CertificateException
1902                | IOException e) {
1903            // We have tried our best to remove all keys
1904            Slog.e(TAG, "Unable to remove keystore profile key for user:" + targetUserId, e);
1905        }
1906    }
1907
1908    @Override
1909    public void registerStrongAuthTracker(IStrongAuthTracker tracker) {
1910        checkPasswordReadPermission(UserHandle.USER_ALL);
1911        mStrongAuth.registerStrongAuthTracker(tracker);
1912    }
1913
1914    @Override
1915    public void unregisterStrongAuthTracker(IStrongAuthTracker tracker) {
1916        checkPasswordReadPermission(UserHandle.USER_ALL);
1917        mStrongAuth.unregisterStrongAuthTracker(tracker);
1918    }
1919
1920    @Override
1921    public void requireStrongAuth(int strongAuthReason, int userId) {
1922        checkWritePermission(userId);
1923        mStrongAuth.requireStrongAuth(strongAuthReason, userId);
1924    }
1925
1926    @Override
1927    public void userPresent(int userId) {
1928        checkWritePermission(userId);
1929        mStrongAuth.reportUnlock(userId);
1930    }
1931
1932    @Override
1933    public int getStrongAuthForUser(int userId) {
1934        checkPasswordReadPermission(userId);
1935        return mStrongAuthTracker.getStrongAuthForUser(userId);
1936    }
1937
1938    private boolean isCallerShell() {
1939        final int callingUid = Binder.getCallingUid();
1940        return callingUid == Process.SHELL_UID || callingUid == Process.ROOT_UID;
1941    }
1942
1943    private void enforceShell() {
1944        if (!isCallerShell()) {
1945            throw new SecurityException("Caller must be shell");
1946        }
1947    }
1948
1949    @Override
1950    public void onShellCommand(FileDescriptor in, FileDescriptor out, FileDescriptor err,
1951            String[] args, ShellCallback callback, ResultReceiver resultReceiver)
1952            throws RemoteException {
1953        enforceShell();
1954        final long origId = Binder.clearCallingIdentity();
1955        try {
1956            (new LockSettingsShellCommand(mContext, new LockPatternUtils(mContext))).exec(
1957                    this, in, out, err, args, callback, resultReceiver);
1958        } finally {
1959            Binder.restoreCallingIdentity(origId);
1960        }
1961    }
1962
1963    @Override
1964    public void initRecoveryService(@NonNull String rootCertificateAlias,
1965            @NonNull byte[] signedPublicKeyList) throws RemoteException {
1966        mRecoverableKeyStoreManager.initRecoveryService(rootCertificateAlias,
1967                signedPublicKeyList);
1968    }
1969
1970    @Override
1971    public KeychainSnapshot getRecoveryData(@NonNull byte[] account) throws RemoteException {
1972        return mRecoverableKeyStoreManager.getRecoveryData(account);
1973    }
1974
1975    public void setSnapshotCreatedPendingIntent(@Nullable PendingIntent intent)
1976            throws RemoteException {
1977        mRecoverableKeyStoreManager.setSnapshotCreatedPendingIntent(intent);
1978    }
1979
1980    public Map getRecoverySnapshotVersions() throws RemoteException {
1981        return mRecoverableKeyStoreManager.getRecoverySnapshotVersions();
1982    }
1983
1984    @Override
1985    public void setServerParams(byte[] serverParams) throws RemoteException {
1986        mRecoverableKeyStoreManager.setServerParams(serverParams);
1987    }
1988
1989    @Override
1990    public void setRecoveryStatus(@NonNull String packageName, @Nullable String[] aliases,
1991            int status) throws RemoteException {
1992        mRecoverableKeyStoreManager.setRecoveryStatus(packageName, aliases, status);
1993    }
1994
1995    public Map getRecoveryStatus(@Nullable String packageName) throws RemoteException {
1996        return mRecoverableKeyStoreManager.getRecoveryStatus(packageName);
1997    }
1998
1999    @Override
2000    public void setRecoverySecretTypes(@NonNull @KeychainProtectionParams.UserSecretType
2001            int[] secretTypes) throws RemoteException {
2002        mRecoverableKeyStoreManager.setRecoverySecretTypes(secretTypes);
2003    }
2004
2005    @Override
2006    public int[] getRecoverySecretTypes() throws RemoteException {
2007        return mRecoverableKeyStoreManager.getRecoverySecretTypes();
2008
2009    }
2010
2011    @Override
2012    public int[] getPendingRecoverySecretTypes() throws RemoteException {
2013        throw new SecurityException("Not implemented");
2014    }
2015
2016    @Override
2017    public void recoverySecretAvailable(@NonNull KeychainProtectionParams recoverySecret)
2018            throws RemoteException {
2019        mRecoverableKeyStoreManager.recoverySecretAvailable(recoverySecret);
2020    }
2021
2022    @Override
2023    public byte[] startRecoverySession(@NonNull String sessionId,
2024            @NonNull byte[] verifierPublicKey, @NonNull byte[] vaultParams,
2025            @NonNull byte[] vaultChallenge, @NonNull List<KeychainProtectionParams> secrets)
2026            throws RemoteException {
2027        return mRecoverableKeyStoreManager.startRecoverySession(sessionId, verifierPublicKey,
2028                vaultParams, vaultChallenge, secrets);
2029    }
2030
2031    public void closeSession(@NonNull String sessionId) throws RemoteException {
2032        mRecoverableKeyStoreManager.closeSession(sessionId);
2033    }
2034
2035    @Override
2036    public Map<String, byte[]> recoverKeys(@NonNull String sessionId,
2037            @NonNull byte[] recoveryKeyBlob, @NonNull List<WrappedApplicationKey> applicationKeys)
2038            throws RemoteException {
2039        return mRecoverableKeyStoreManager.recoverKeys(
2040                sessionId, recoveryKeyBlob, applicationKeys);
2041    }
2042
2043    @Override
2044    public void removeKey(@NonNull String alias) throws RemoteException {
2045        mRecoverableKeyStoreManager.removeKey(alias);
2046    }
2047
2048    @Override
2049    public byte[] generateAndStoreKey(@NonNull String alias) throws RemoteException {
2050        return mRecoverableKeyStoreManager.generateAndStoreKey(alias);
2051    }
2052
2053    private static final String[] VALID_SETTINGS = new String[] {
2054            LockPatternUtils.LOCKOUT_PERMANENT_KEY,
2055            LockPatternUtils.LOCKOUT_ATTEMPT_DEADLINE,
2056            LockPatternUtils.PATTERN_EVER_CHOSEN_KEY,
2057            LockPatternUtils.PASSWORD_TYPE_KEY,
2058            LockPatternUtils.PASSWORD_TYPE_ALTERNATE_KEY,
2059            LockPatternUtils.LOCK_PASSWORD_SALT_KEY,
2060            LockPatternUtils.DISABLE_LOCKSCREEN_KEY,
2061            LockPatternUtils.LOCKSCREEN_OPTIONS,
2062            LockPatternUtils.LOCKSCREEN_BIOMETRIC_WEAK_FALLBACK,
2063            LockPatternUtils.BIOMETRIC_WEAK_EVER_CHOSEN_KEY,
2064            LockPatternUtils.LOCKSCREEN_POWER_BUTTON_INSTANTLY_LOCKS,
2065            LockPatternUtils.PASSWORD_HISTORY_KEY,
2066            Secure.LOCK_PATTERN_ENABLED,
2067            Secure.LOCK_BIOMETRIC_WEAK_FLAGS,
2068            Secure.LOCK_PATTERN_VISIBLE,
2069            Secure.LOCK_PATTERN_TACTILE_FEEDBACK_ENABLED
2070    };
2071
2072    // Reading these settings needs the contacts permission
2073    private static final String[] READ_CONTACTS_PROTECTED_SETTINGS = new String[] {
2074            Secure.LOCK_SCREEN_OWNER_INFO_ENABLED,
2075            Secure.LOCK_SCREEN_OWNER_INFO
2076    };
2077
2078    // Reading these settings needs the same permission as checking the password
2079    private static final String[] READ_PASSWORD_PROTECTED_SETTINGS = new String[] {
2080            LockPatternUtils.LOCK_PASSWORD_SALT_KEY,
2081            LockPatternUtils.PASSWORD_HISTORY_KEY,
2082            LockPatternUtils.PASSWORD_TYPE_KEY,
2083            SEPARATE_PROFILE_CHALLENGE_KEY
2084    };
2085
2086    private static final String[] SETTINGS_TO_BACKUP = new String[] {
2087            Secure.LOCK_SCREEN_OWNER_INFO_ENABLED,
2088            Secure.LOCK_SCREEN_OWNER_INFO,
2089            Secure.LOCK_PATTERN_VISIBLE,
2090            LockPatternUtils.LOCKSCREEN_POWER_BUTTON_INSTANTLY_LOCKS
2091    };
2092
2093    private class GateKeeperDiedRecipient implements IBinder.DeathRecipient {
2094        @Override
2095        public void binderDied() {
2096            mGateKeeperService.asBinder().unlinkToDeath(this, 0);
2097            mGateKeeperService = null;
2098        }
2099    }
2100
2101    protected synchronized IGateKeeperService getGateKeeperService()
2102            throws RemoteException {
2103        if (mGateKeeperService != null) {
2104            return mGateKeeperService;
2105        }
2106
2107        final IBinder service = ServiceManager.getService(Context.GATEKEEPER_SERVICE);
2108        if (service != null) {
2109            service.linkToDeath(new GateKeeperDiedRecipient(), 0);
2110            mGateKeeperService = IGateKeeperService.Stub.asInterface(service);
2111            return mGateKeeperService;
2112        }
2113
2114        Slog.e(TAG, "Unable to acquire GateKeeperService");
2115        return null;
2116    }
2117
2118    /**
2119     * A user's synthetic password does not change so it must be cached in certain circumstances to
2120     * enable untrusted credential reset.
2121     *
2122     * Untrusted credential reset will be removed in a future version (b/68036371) at which point
2123     * this cache is no longer needed as the SP will always be known when changing the user's
2124     * credential.
2125     */
2126    @GuardedBy("mSpManager")
2127    private SparseArray<AuthenticationToken> mSpCache = new SparseArray();
2128
2129    private void onAuthTokenKnownForUser(@UserIdInt int userId, AuthenticationToken auth) {
2130        // Update the SP cache, removing the entry when allowed
2131        synchronized (mSpManager) {
2132            if (shouldCacheSpForUser(userId)) {
2133                Slog.i(TAG, "Caching SP for user " + userId);
2134                mSpCache.put(userId, auth);
2135            } else {
2136                Slog.i(TAG, "Not caching SP for user " + userId);
2137                mSpCache.delete(userId);
2138            }
2139        }
2140    }
2141
2142    /** Clean up the SP cache by removing unneeded entries. */
2143    private void cleanSpCache() {
2144        synchronized (mSpManager) {
2145            // Preserve indicies after removal by iterating backwards
2146            for (int i = mSpCache.size() - 1; i >= 0; --i) {
2147                final int userId = mSpCache.keyAt(i);
2148                if (!shouldCacheSpForUser(userId)) {
2149                    Slog.i(TAG, "Uncaching SP for user " + userId);
2150                    mSpCache.removeAt(i);
2151                }
2152            }
2153        }
2154    }
2155
2156    private boolean shouldCacheSpForUser(@UserIdInt int userId) {
2157        // Before the user setup has completed, an admin could be installed that requires the SP to
2158        // be cached (see below).
2159        if (Settings.Secure.getIntForUser(mContext.getContentResolver(),
2160                    Settings.Secure.USER_SETUP_COMPLETE, 0, userId) == 0) {
2161            return true;
2162        }
2163
2164        // If the user has an admin which can perform an untrusted credential reset, the SP needs to
2165        // be cached. If there isn't a DevicePolicyManager then there can't be an admin in the first
2166        // place so caching is not necessary.
2167        final DevicePolicyManagerInternal dpmi = LocalServices.getService(
2168                DevicePolicyManagerInternal.class);
2169        if (dpmi == null) {
2170            return false;
2171        }
2172        return dpmi.canUserHaveUntrustedCredentialReset(userId);
2173    }
2174
2175    /**
2176     * Precondition: vold and keystore unlocked.
2177     *
2178     * Create new synthetic password, set up synthetic password blob protected by the supplied
2179     * user credential, and make the newly-created SP blob active.
2180     *
2181     * The invariant under a synthetic password is:
2182     * 1. If user credential exists, then both vold and keystore and protected with keys derived
2183     *     from the synthetic password.
2184     * 2. If user credential does not exist, vold and keystore protection are cleared. This is to
2185     *     make it consistent with current behaviour. It also allows ActivityManager to call
2186     *     unlockUser() with empty secret.
2187     * 3. Once a user is migrated to have synthetic password, its value will never change, no matter
2188     *     whether the user changes his lockscreen PIN or clear/reset it. When the user clears its
2189     *     lockscreen PIN, we still maintain the existing synthetic password in a password blob
2190     *     protected by a default PIN.
2191     * 4. The user SID is linked with synthetic password, but its cleared/re-created when the user
2192     *     clears/re-creates his lockscreen PIN.
2193     *
2194     *
2195     * Different cases of calling this method:
2196     * 1. credentialHash != null
2197     *     This implies credential != null, a new SP blob will be provisioned, and existing SID
2198     *     migrated to associate with the new SP.
2199     *     This happens during a normal migration case when the user currently has password.
2200     *
2201     * 2. credentialhash == null and credential == null
2202     *     A new SP blob and a new SID will be created, while the user has no credentials.
2203     *     This can happens when we are activating an escrow token on a unsecured device, during
2204     *     which we want to create the SP structure with an empty user credential.
2205     *
2206     * 3. credentialhash == null and credential != null
2207     *     This is the untrusted credential reset, OR the user sets a new lockscreen password
2208     *     FOR THE FIRST TIME on a SP-enabled device. New credential and new SID will be created
2209     */
2210    @GuardedBy("mSpManager")
2211    @VisibleForTesting
2212    protected AuthenticationToken initializeSyntheticPasswordLocked(byte[] credentialHash,
2213            String credential, int credentialType, int requestedQuality,
2214            int userId) throws RemoteException {
2215        Slog.i(TAG, "Initialize SyntheticPassword for user: " + userId);
2216        // Load from the cache or a make a new one
2217        AuthenticationToken auth = mSpCache.get(userId);
2218        if (auth != null) {
2219            // If the synthetic password has been cached, we can only be in case 3., described
2220            // above, for an untrusted credential reset so a new SID is still needed.
2221            mSpManager.newSidForUser(getGateKeeperService(), auth, userId);
2222        } else {
2223            auth = mSpManager.newSyntheticPasswordAndSid(getGateKeeperService(),
2224                      credentialHash, credential, userId);
2225        }
2226        onAuthTokenKnownForUser(userId, auth);
2227        if (auth == null) {
2228            Slog.wtf(TAG, "initializeSyntheticPasswordLocked returns null auth token");
2229            return null;
2230        }
2231        long handle = mSpManager.createPasswordBasedSyntheticPassword(getGateKeeperService(),
2232                credential, credentialType, auth, requestedQuality, userId);
2233        if (credential != null) {
2234            if (credentialHash == null) {
2235                // Since when initializing SP, we didn't provide an existing password handle
2236                // for it to migrate SID, we need to create a new SID for the user.
2237                mSpManager.newSidForUser(getGateKeeperService(), auth, userId);
2238            }
2239            mSpManager.verifyChallenge(getGateKeeperService(), auth, 0L, userId);
2240            setAuthlessUserKeyProtection(userId, auth.deriveDiskEncryptionKey());
2241            setKeystorePassword(auth.deriveKeyStorePassword(), userId);
2242        } else {
2243            clearUserKeyProtection(userId);
2244            setKeystorePassword(null, userId);
2245            getGateKeeperService().clearSecureUserId(userId);
2246        }
2247        fixateNewestUserKeyAuth(userId);
2248        setLong(SYNTHETIC_PASSWORD_HANDLE_KEY, handle, userId);
2249        return auth;
2250    }
2251
2252    private long getSyntheticPasswordHandleLocked(int userId) {
2253        return getLong(SYNTHETIC_PASSWORD_HANDLE_KEY,
2254                SyntheticPasswordManager.DEFAULT_HANDLE, userId);
2255    }
2256
2257    private boolean isSyntheticPasswordBasedCredentialLocked(int userId) throws RemoteException {
2258        if (userId == USER_FRP) {
2259            final int type = mStorage.readPersistentDataBlock().type;
2260            return type == PersistentData.TYPE_SP || type == PersistentData.TYPE_SP_WEAVER;
2261        }
2262        long handle = getSyntheticPasswordHandleLocked(userId);
2263        // This is a global setting
2264        long enabled = getLong(SYNTHETIC_PASSWORD_ENABLED_KEY,
2265                SYNTHETIC_PASSWORD_ENABLED_BY_DEFAULT, UserHandle.USER_SYSTEM);
2266      return enabled != 0 && handle != SyntheticPasswordManager.DEFAULT_HANDLE;
2267    }
2268
2269    @VisibleForTesting
2270    protected boolean shouldMigrateToSyntheticPasswordLocked(int userId) throws RemoteException {
2271        long handle = getSyntheticPasswordHandleLocked(userId);
2272        // This is a global setting
2273        long enabled = getLong(SYNTHETIC_PASSWORD_ENABLED_KEY,
2274                SYNTHETIC_PASSWORD_ENABLED_BY_DEFAULT, UserHandle.USER_SYSTEM);
2275        return enabled != 0 && handle == SyntheticPasswordManager.DEFAULT_HANDLE;
2276    }
2277
2278    private void enableSyntheticPasswordLocked() throws RemoteException {
2279        setLong(SYNTHETIC_PASSWORD_ENABLED_KEY, 1, UserHandle.USER_SYSTEM);
2280    }
2281
2282    private VerifyCredentialResponse spBasedDoVerifyCredential(String userCredential, int
2283            credentialType, boolean hasChallenge, long challenge, int userId,
2284            ICheckCredentialProgressCallback progressCallback) throws RemoteException {
2285        if (DEBUG) Slog.d(TAG, "spBasedDoVerifyCredential: user=" + userId);
2286        if (credentialType == LockPatternUtils.CREDENTIAL_TYPE_NONE) {
2287            userCredential = null;
2288        }
2289
2290        final AuthenticationResult authResult;
2291        VerifyCredentialResponse response;
2292        synchronized (mSpManager) {
2293            if (!isSyntheticPasswordBasedCredentialLocked(userId)) {
2294                return null;
2295            }
2296            if (userId == USER_FRP) {
2297                return mSpManager.verifyFrpCredential(getGateKeeperService(),
2298                        userCredential, credentialType, progressCallback);
2299            }
2300
2301            long handle = getSyntheticPasswordHandleLocked(userId);
2302            authResult = mSpManager.unwrapPasswordBasedSyntheticPassword(
2303                    getGateKeeperService(), handle, userCredential, userId, progressCallback);
2304
2305            if (authResult.credentialType != credentialType) {
2306                Slog.e(TAG, "Credential type mismatch.");
2307                return VerifyCredentialResponse.ERROR;
2308            }
2309            response = authResult.gkResponse;
2310            // credential has matched
2311            if (response.getResponseCode() == VerifyCredentialResponse.RESPONSE_OK) {
2312                // perform verifyChallenge with synthetic password which generates the real GK auth
2313                // token and response for the current user
2314                response = mSpManager.verifyChallenge(getGateKeeperService(), authResult.authToken,
2315                        challenge, userId);
2316                if (response.getResponseCode() != VerifyCredentialResponse.RESPONSE_OK) {
2317                    // This shouldn't really happen: the unwrapping of SP succeeds, but SP doesn't
2318                    // match the recorded GK password handle.
2319                    Slog.wtf(TAG, "verifyChallenge with SP failed.");
2320                    return VerifyCredentialResponse.ERROR;
2321                }
2322            }
2323        }
2324
2325        if (response.getResponseCode() == VerifyCredentialResponse.RESPONSE_OK) {
2326            notifyActivePasswordMetricsAvailable(userCredential, userId);
2327            unlockKeystore(authResult.authToken.deriveKeyStorePassword(), userId);
2328
2329            final byte[] secret = authResult.authToken.deriveDiskEncryptionKey();
2330            Slog.i(TAG, "Unlocking user " + userId + " with secret only, length " + secret.length);
2331            unlockUser(userId, null, secret);
2332
2333            activateEscrowTokens(authResult.authToken, userId);
2334
2335            if (isManagedProfileWithSeparatedLock(userId)) {
2336                TrustManager trustManager =
2337                        (TrustManager) mContext.getSystemService(Context.TRUST_SERVICE);
2338                trustManager.setDeviceLockedForUser(userId, false);
2339            }
2340            mStrongAuth.reportSuccessfulStrongAuthUnlock(userId);
2341
2342            onAuthTokenKnownForUser(userId, authResult.authToken);
2343        } else if (response.getResponseCode() == VerifyCredentialResponse.RESPONSE_RETRY) {
2344            if (response.getTimeout() > 0) {
2345                requireStrongAuth(STRONG_AUTH_REQUIRED_AFTER_LOCKOUT, userId);
2346            }
2347        }
2348
2349        return response;
2350    }
2351
2352    /**
2353     * Change the user's lockscreen password by creating a new SP blob and update the handle, based
2354     * on an existing authentication token. Even though a new SP blob is created, the underlying
2355     * synthetic password is never changed.
2356     *
2357     * When clearing credential, we keep the SP unchanged, but clear its password handle so its
2358     * SID is gone. We also clear password from (software-based) keystore and vold, which will be
2359     * added back when new password is set in future.
2360     */
2361    @GuardedBy("mSpManager")
2362    private long setLockCredentialWithAuthTokenLocked(String credential, int credentialType,
2363            AuthenticationToken auth, int requestedQuality, int userId) throws RemoteException {
2364        if (DEBUG) Slog.d(TAG, "setLockCredentialWithAuthTokenLocked: user=" + userId);
2365        long newHandle = mSpManager.createPasswordBasedSyntheticPassword(getGateKeeperService(),
2366                credential, credentialType, auth, requestedQuality, userId);
2367        final Map<Integer, String> profilePasswords;
2368        if (credential != null) {
2369            // // not needed by synchronizeUnifiedWorkChallengeForProfiles()
2370            profilePasswords = null;
2371
2372            if (mSpManager.hasSidForUser(userId)) {
2373                // We are changing password of a secured device, nothing more needed as
2374                // createPasswordBasedSyntheticPassword has already taken care of maintaining
2375                // the password handle and SID unchanged.
2376
2377                //refresh auth token
2378                mSpManager.verifyChallenge(getGateKeeperService(), auth, 0L, userId);
2379            } else {
2380                // A new password is set on a previously-unsecured device, we need to generate
2381                // a new SID, and re-add keys to vold and keystore.
2382                mSpManager.newSidForUser(getGateKeeperService(), auth, userId);
2383                mSpManager.verifyChallenge(getGateKeeperService(), auth, 0L, userId);
2384                setAuthlessUserKeyProtection(userId, auth.deriveDiskEncryptionKey());
2385                fixateNewestUserKeyAuth(userId);
2386                setKeystorePassword(auth.deriveKeyStorePassword(), userId);
2387            }
2388        } else {
2389            // Cache all profile password if they use unified work challenge. This will later be
2390            // used to clear the profile's password in synchronizeUnifiedWorkChallengeForProfiles()
2391            profilePasswords = getDecryptedPasswordsForAllTiedProfiles(userId);
2392
2393            // we are clearing password of a secured device, so need to nuke SID as well.
2394            mSpManager.clearSidForUser(userId);
2395            getGateKeeperService().clearSecureUserId(userId);
2396            // Clear key from vold so ActivityManager can just unlock the user with empty secret
2397            // during boot.
2398            clearUserKeyProtection(userId);
2399            fixateNewestUserKeyAuth(userId);
2400            setKeystorePassword(null, userId);
2401        }
2402        setLong(SYNTHETIC_PASSWORD_HANDLE_KEY, newHandle, userId);
2403        synchronizeUnifiedWorkChallengeForProfiles(userId, profilePasswords);
2404
2405        notifyActivePasswordMetricsAvailable(credential, userId);
2406        return newHandle;
2407    }
2408
2409    @GuardedBy("mSpManager")
2410    private void spBasedSetLockCredentialInternalLocked(String credential, int credentialType,
2411            String savedCredential, int requestedQuality, int userId) throws RemoteException {
2412        if (DEBUG) Slog.d(TAG, "spBasedSetLockCredentialInternalLocked: user=" + userId);
2413        if (isManagedProfileWithUnifiedLock(userId)) {
2414            // get credential from keystore when managed profile has unified lock
2415            try {
2416                savedCredential = getDecryptedPasswordForTiedProfile(userId);
2417            } catch (FileNotFoundException e) {
2418                Slog.i(TAG, "Child profile key not found");
2419            } catch (UnrecoverableKeyException | InvalidKeyException | KeyStoreException
2420                    | NoSuchAlgorithmException | NoSuchPaddingException
2421                    | InvalidAlgorithmParameterException | IllegalBlockSizeException
2422                    | BadPaddingException | CertificateException | IOException e) {
2423                Slog.e(TAG, "Failed to decrypt child profile key", e);
2424            }
2425        }
2426        long handle = getSyntheticPasswordHandleLocked(userId);
2427        AuthenticationResult authResult = mSpManager.unwrapPasswordBasedSyntheticPassword(
2428                getGateKeeperService(), handle, savedCredential, userId, null);
2429        VerifyCredentialResponse response = authResult.gkResponse;
2430        AuthenticationToken auth = authResult.authToken;
2431
2432        // If existing credential is provided, then it must match.
2433        if (savedCredential != null && auth == null) {
2434            throw new RemoteException("Failed to enroll " +
2435                    (credentialType == LockPatternUtils.CREDENTIAL_TYPE_PASSWORD ? "password"
2436                            : "pattern"));
2437        }
2438
2439        if (auth != null) {
2440            // We are performing a trusted credential change i.e. a correct existing credential
2441            // is provided
2442            setLockCredentialWithAuthTokenLocked(credential, credentialType, auth, requestedQuality,
2443                    userId);
2444            mSpManager.destroyPasswordBasedSyntheticPassword(handle, userId);
2445            onAuthTokenKnownForUser(userId, auth);
2446        } else if (response != null
2447                && response.getResponseCode() == VerifyCredentialResponse.RESPONSE_ERROR) {
2448            // We are performing an untrusted credential change i.e. by DevicePolicyManager.
2449            // So provision a new SP and SID. This would invalidate existing escrow tokens.
2450            // Still support this for now but this flow will be removed in the next release.
2451            Slog.w(TAG, "Untrusted credential change invoked");
2452
2453            if (mSpCache.get(userId) == null) {
2454                throw new IllegalStateException(
2455                        "Untrusted credential reset not possible without cached SP");
2456            }
2457
2458            initializeSyntheticPasswordLocked(null, credential, credentialType, requestedQuality,
2459                    userId);
2460            synchronizeUnifiedWorkChallengeForProfiles(userId, null);
2461            mSpManager.destroyPasswordBasedSyntheticPassword(handle, userId);
2462
2463            notifyActivePasswordMetricsAvailable(credential, userId);
2464        } else /* response == null || responseCode == VerifyCredentialResponse.RESPONSE_RETRY */ {
2465            Slog.w(TAG, "spBasedSetLockCredentialInternalLocked: " +
2466                    (response != null ? "rate limit exceeded" : "failed"));
2467            return;
2468        }
2469    }
2470
2471    @Override
2472    public long addEscrowToken(byte[] token, int userId) throws RemoteException {
2473        ensureCallerSystemUid();
2474        if (DEBUG) Slog.d(TAG, "addEscrowToken: user=" + userId);
2475        synchronized (mSpManager) {
2476            enableSyntheticPasswordLocked();
2477            // Migrate to synthetic password based credentials if the user has no password,
2478            // the token can then be activated immediately.
2479            AuthenticationToken auth = null;
2480            if (!isUserSecure(userId)) {
2481                if (shouldMigrateToSyntheticPasswordLocked(userId)) {
2482                    auth = initializeSyntheticPasswordLocked(null, null,
2483                            LockPatternUtils.CREDENTIAL_TYPE_NONE,
2484                            DevicePolicyManager.PASSWORD_QUALITY_UNSPECIFIED, userId);
2485                } else /* isSyntheticPasswordBasedCredentialLocked(userId) */ {
2486                    long pwdHandle = getSyntheticPasswordHandleLocked(userId);
2487                    auth = mSpManager.unwrapPasswordBasedSyntheticPassword(getGateKeeperService(),
2488                            pwdHandle, null, userId, null).authToken;
2489                }
2490            }
2491            if (isSyntheticPasswordBasedCredentialLocked(userId)) {
2492                disableEscrowTokenOnNonManagedDevicesIfNeeded(userId);
2493                if (!mSpManager.hasEscrowData(userId)) {
2494                    throw new SecurityException("Escrow token is disabled on the current user");
2495                }
2496            }
2497            long handle = mSpManager.createTokenBasedSyntheticPassword(token, userId);
2498            if (auth != null) {
2499                mSpManager.activateTokenBasedSyntheticPassword(handle, auth, userId);
2500            }
2501            return handle;
2502        }
2503    }
2504
2505    private void activateEscrowTokens(AuthenticationToken auth, int userId) throws RemoteException {
2506        if (DEBUG) Slog.d(TAG, "activateEscrowTokens: user=" + userId);
2507        synchronized (mSpManager) {
2508            disableEscrowTokenOnNonManagedDevicesIfNeeded(userId);
2509            for (long handle : mSpManager.getPendingTokensForUser(userId)) {
2510                Slog.i(TAG, String.format("activateEscrowTokens: %x %d ", handle, userId));
2511                mSpManager.activateTokenBasedSyntheticPassword(handle, auth, userId);
2512            }
2513        }
2514    }
2515
2516    @Override
2517    public boolean isEscrowTokenActive(long handle, int userId) throws RemoteException {
2518        ensureCallerSystemUid();
2519        synchronized (mSpManager) {
2520            return mSpManager.existsHandle(handle, userId);
2521        }
2522    }
2523
2524    @Override
2525    public boolean removeEscrowToken(long handle, int userId) throws RemoteException {
2526        ensureCallerSystemUid();
2527        synchronized (mSpManager) {
2528            if (handle == getSyntheticPasswordHandleLocked(userId)) {
2529                Slog.w(TAG, "Cannot remove password handle");
2530                return false;
2531            }
2532            if (mSpManager.removePendingToken(handle, userId)) {
2533                return true;
2534            }
2535            if (mSpManager.existsHandle(handle, userId)) {
2536                mSpManager.destroyTokenBasedSyntheticPassword(handle, userId);
2537                return true;
2538            } else {
2539                return false;
2540            }
2541        }
2542    }
2543
2544    @Override
2545    public boolean setLockCredentialWithToken(String credential, int type, long tokenHandle,
2546            byte[] token, int requestedQuality, int userId) throws RemoteException {
2547        ensureCallerSystemUid();
2548        boolean result;
2549        synchronized (mSpManager) {
2550            if (!mSpManager.hasEscrowData(userId)) {
2551                throw new SecurityException("Escrow token is disabled on the current user");
2552            }
2553            result = setLockCredentialWithTokenInternal(credential, type, tokenHandle, token,
2554                    requestedQuality, userId);
2555        }
2556        if (result) {
2557            synchronized (mSeparateChallengeLock) {
2558                setSeparateProfileChallengeEnabledLocked(userId, true, null);
2559            }
2560            notifyPasswordChanged(userId);
2561            notifySeparateProfileChallengeChanged(userId);
2562        }
2563        return result;
2564    }
2565
2566    private boolean setLockCredentialWithTokenInternal(String credential, int type,
2567            long tokenHandle, byte[] token, int requestedQuality, int userId) throws RemoteException {
2568        final AuthenticationResult result;
2569        synchronized (mSpManager) {
2570            result = mSpManager.unwrapTokenBasedSyntheticPassword(
2571                    getGateKeeperService(), tokenHandle, token, userId);
2572            if (result.authToken == null) {
2573                Slog.w(TAG, "Invalid escrow token supplied");
2574                return false;
2575            }
2576            if (result.gkResponse.getResponseCode() != VerifyCredentialResponse.RESPONSE_OK) {
2577                // Most likely, an untrusted credential reset happened in the past which
2578                // changed the synthetic password
2579                Slog.e(TAG, "Obsolete token: synthetic password derived but it fails GK "
2580                        + "verification.");
2581                return false;
2582            }
2583            // Update PASSWORD_TYPE_KEY since it's needed by notifyActivePasswordMetricsAvailable()
2584            // called by setLockCredentialWithAuthTokenLocked().
2585            // TODO: refactor usage of PASSWORD_TYPE_KEY b/65239740
2586            setLong(LockPatternUtils.PASSWORD_TYPE_KEY, requestedQuality, userId);
2587            long oldHandle = getSyntheticPasswordHandleLocked(userId);
2588            setLockCredentialWithAuthTokenLocked(credential, type, result.authToken,
2589                    requestedQuality, userId);
2590            mSpManager.destroyPasswordBasedSyntheticPassword(oldHandle, userId);
2591        }
2592        onAuthTokenKnownForUser(userId, result.authToken);
2593        return true;
2594    }
2595
2596    @Override
2597    public void unlockUserWithToken(long tokenHandle, byte[] token, int userId)
2598            throws RemoteException {
2599        ensureCallerSystemUid();
2600        AuthenticationResult authResult;
2601        synchronized (mSpManager) {
2602            if (!mSpManager.hasEscrowData(userId)) {
2603                throw new SecurityException("Escrow token is disabled on the current user");
2604            }
2605            authResult = mSpManager.unwrapTokenBasedSyntheticPassword(getGateKeeperService(),
2606                    tokenHandle, token, userId);
2607            if (authResult.authToken == null) {
2608                Slog.w(TAG, "Invalid escrow token supplied");
2609                return;
2610            }
2611        }
2612        unlockUser(userId, null, authResult.authToken.deriveDiskEncryptionKey());
2613        onAuthTokenKnownForUser(userId, authResult.authToken);
2614    }
2615
2616    @Override
2617    protected void dump(FileDescriptor fd, PrintWriter pw, String[] args){
2618        if (!DumpUtils.checkDumpPermission(mContext, TAG, pw)) return;
2619
2620        pw.println("Current lock settings service state:");
2621        pw.println(String.format("SP Enabled = %b",
2622                mLockPatternUtils.isSyntheticPasswordEnabled()));
2623
2624        List<UserInfo> users = mUserManager.getUsers();
2625        for (int user = 0; user < users.size(); user++) {
2626            final int userId = users.get(user).id;
2627            pw.println("    User " + userId);
2628            synchronized (mSpManager) {
2629                pw.println(String.format("        SP Handle = %x",
2630                        getSyntheticPasswordHandleLocked(userId)));
2631            }
2632            try {
2633                pw.println(String.format("        SID = %x",
2634                        getGateKeeperService().getSecureUserId(userId)));
2635            } catch (RemoteException e) {
2636                // ignore.
2637            }
2638        }
2639    }
2640
2641    private void disableEscrowTokenOnNonManagedDevicesIfNeeded(int userId) {
2642        long ident = Binder.clearCallingIdentity();
2643        try {
2644            // Managed profile should have escrow enabled
2645            if (mUserManager.getUserInfo(userId).isManagedProfile()) {
2646                Slog.i(TAG, "Managed profile can have escrow token");
2647                return;
2648            }
2649            DevicePolicyManager dpm = mInjector.getDevicePolicyManager();
2650            // Devices with Device Owner should have escrow enabled on all users.
2651            if (dpm.getDeviceOwnerComponentOnAnyUser() != null) {
2652                Slog.i(TAG, "Corp-owned device can have escrow token");
2653                return;
2654            }
2655            // We could also have a profile owner on the given (non-managed) user for unicorn cases
2656            if (dpm.getProfileOwnerAsUser(userId) != null) {
2657                Slog.i(TAG, "User with profile owner can have escrow token");
2658                return;
2659            }
2660            // If the device is yet to be provisioned (still in SUW), there is still
2661            // a chance that Device Owner will be set on the device later, so postpone
2662            // disabling escrow token for now.
2663            if (!dpm.isDeviceProvisioned()) {
2664                Slog.i(TAG, "Postpone disabling escrow tokens until device is provisioned");
2665                return;
2666            }
2667
2668            // Escrow tokens are enabled on automotive builds.
2669            if (mContext.getPackageManager().hasSystemFeature(PackageManager.FEATURE_AUTOMOTIVE)) {
2670                return;
2671            }
2672
2673            // Disable escrow token permanently on all other device/user types.
2674            Slog.i(TAG, "Disabling escrow token on user " + userId);
2675            if (isSyntheticPasswordBasedCredentialLocked(userId)) {
2676                mSpManager.destroyEscrowData(userId);
2677            }
2678        } catch (RemoteException e) {
2679            Slog.e(TAG, "disableEscrowTokenOnNonManagedDevices", e);
2680        } finally {
2681            Binder.restoreCallingIdentity(ident);
2682        }
2683    }
2684
2685    private void ensureCallerSystemUid() throws SecurityException {
2686        final int callingUid = mInjector.binderGetCallingUid();
2687        if (callingUid != Process.SYSTEM_UID) {
2688            throw new SecurityException("Only system can call this API.");
2689        }
2690    }
2691
2692    private class DeviceProvisionedObserver extends ContentObserver {
2693        private final Uri mDeviceProvisionedUri = Settings.Global.getUriFor(
2694                Settings.Global.DEVICE_PROVISIONED);
2695        private final Uri mUserSetupCompleteUri = Settings.Secure.getUriFor(
2696                Settings.Secure.USER_SETUP_COMPLETE);
2697
2698        private boolean mRegistered;
2699
2700        public DeviceProvisionedObserver() {
2701            super(null);
2702        }
2703
2704        @Override
2705        public void onChange(boolean selfChange, Uri uri) {
2706            if (mDeviceProvisionedUri.equals(uri)) {
2707                updateRegistration();
2708
2709                if (isProvisioned()) {
2710                    Slog.i(TAG, "Reporting device setup complete to IGateKeeperService");
2711                    reportDeviceSetupComplete();
2712                    clearFrpCredentialIfOwnerNotSecure();
2713                }
2714            } else if (mUserSetupCompleteUri.equals(uri)) {
2715                cleanSpCache();
2716            }
2717        }
2718
2719        public void onSystemReady() {
2720            if (frpCredentialEnabled(mContext)) {
2721                updateRegistration();
2722            } else {
2723                // If we don't intend to use frpCredentials and we're not provisioned yet, send
2724                // deviceSetupComplete immediately, so gatekeeper can discard any lingering
2725                // credentials immediately.
2726                if (!isProvisioned()) {
2727                    Slog.i(TAG, "FRP credential disabled, reporting device setup complete "
2728                            + "to Gatekeeper immediately");
2729                    reportDeviceSetupComplete();
2730                }
2731            }
2732        }
2733
2734        private void reportDeviceSetupComplete() {
2735            try {
2736                getGateKeeperService().reportDeviceSetupComplete();
2737            } catch (RemoteException e) {
2738                Slog.e(TAG, "Failure reporting to IGateKeeperService", e);
2739            }
2740        }
2741
2742        /**
2743         * Clears the FRP credential if the user that controls it does not have a secure
2744         * lockscreen.
2745         */
2746        private void clearFrpCredentialIfOwnerNotSecure() {
2747            List<UserInfo> users = mUserManager.getUsers();
2748            for (UserInfo user : users) {
2749                if (userOwnsFrpCredential(mContext, user)) {
2750                    if (!isUserSecure(user.id)) {
2751                        mStorage.writePersistentDataBlock(PersistentData.TYPE_NONE, user.id,
2752                                0, null);
2753                    }
2754                    return;
2755                }
2756            }
2757        }
2758
2759        private void updateRegistration() {
2760            boolean register = !isProvisioned();
2761            if (register == mRegistered) {
2762                return;
2763            }
2764            if (register) {
2765                mContext.getContentResolver().registerContentObserver(mDeviceProvisionedUri,
2766                        false, this);
2767                mContext.getContentResolver().registerContentObserver(mUserSetupCompleteUri,
2768                        false, this, UserHandle.USER_ALL);
2769            } else {
2770                mContext.getContentResolver().unregisterContentObserver(this);
2771            }
2772            mRegistered = register;
2773        }
2774
2775        private boolean isProvisioned() {
2776            return Settings.Global.getInt(mContext.getContentResolver(),
2777                    Settings.Global.DEVICE_PROVISIONED, 0) != 0;
2778        }
2779    }
2780}
2781