UserManagerService.java revision 2a5d6c6cbd0286ebca844d4fb8f4d3437ad1ecdd 
1/*
2 * Copyright (C) 2011 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.pm;
18
19import android.accounts.Account;
20import android.annotation.NonNull;
21import android.app.Activity;
22import android.app.ActivityManager;
23import android.app.ActivityManagerNative;
24import android.app.IStopUserCallback;
25import android.app.admin.DevicePolicyManager;
26import android.content.BroadcastReceiver;
27import android.content.Context;
28import android.content.Intent;
29import android.content.pm.ApplicationInfo;
30import android.content.pm.PackageManager;
31import android.content.pm.PackageManager.NameNotFoundException;
32import android.content.pm.UserInfo;
33import android.graphics.Bitmap;
34import android.os.Binder;
35import android.os.Bundle;
36import android.os.Environment;
37import android.os.FileUtils;
38import android.os.Handler;
39import android.os.IUserManager;
40import android.os.Message;
41import android.os.ParcelFileDescriptor;
42import android.os.Parcelable;
43import android.os.Process;
44import android.os.RemoteException;
45import android.os.ServiceManager;
46import android.os.UserHandle;
47import android.os.UserManager;
48import android.os.storage.StorageManager;
49import android.os.storage.VolumeInfo;
50import android.system.ErrnoException;
51import android.system.Os;
52import android.system.OsConstants;
53import android.util.AtomicFile;
54import android.util.Log;
55import android.util.Slog;
56import android.util.SparseArray;
57import android.util.SparseBooleanArray;
58import android.util.TimeUtils;
59import android.util.Xml;
60
61import com.google.android.collect.Sets;
62
63import com.android.internal.annotations.VisibleForTesting;
64import com.android.internal.app.IAppOpsService;
65import com.android.internal.util.FastXmlSerializer;
66import com.android.internal.util.XmlUtils;
67import com.android.server.accounts.AccountManagerService;
68
69import org.xmlpull.v1.XmlPullParser;
70import org.xmlpull.v1.XmlPullParserException;
71import org.xmlpull.v1.XmlSerializer;
72
73import java.io.BufferedOutputStream;
74import java.io.File;
75import java.io.FileDescriptor;
76import java.io.FileInputStream;
77import java.io.FileNotFoundException;
78import java.io.FileOutputStream;
79import java.io.IOException;
80import java.io.PrintWriter;
81import java.nio.charset.StandardCharsets;
82import java.util.ArrayList;
83import java.util.List;
84import java.util.Set;
85
86import libcore.io.IoUtils;
87
88public class UserManagerService extends IUserManager.Stub {
89
90    private static final String LOG_TAG = "UserManagerService";
91
92    private static final boolean DBG = false;
93
94    private static final String TAG_NAME = "name";
95    private static final String ATTR_FLAGS = "flags";
96    private static final String ATTR_ICON_PATH = "icon";
97    private static final String ATTR_ID = "id";
98    private static final String ATTR_CREATION_TIME = "created";
99    private static final String ATTR_LAST_LOGGED_IN_TIME = "lastLoggedIn";
100    private static final String ATTR_SERIAL_NO = "serialNumber";
101    private static final String ATTR_NEXT_SERIAL_NO = "nextSerialNumber";
102    private static final String ATTR_PARTIAL = "partial";
103    private static final String ATTR_GUEST_TO_REMOVE = "guestToRemove";
104    private static final String ATTR_USER_VERSION = "version";
105    private static final String ATTR_PROFILE_GROUP_ID = "profileGroupId";
106    private static final String ATTR_RESTRICTED_PROFILE_PARENT_ID = "restrictedProfileParentId";
107    private static final String TAG_GUEST_RESTRICTIONS = "guestRestrictions";
108    private static final String TAG_USERS = "users";
109    private static final String TAG_USER = "user";
110    private static final String TAG_RESTRICTIONS = "restrictions";
111    private static final String TAG_ENTRY = "entry";
112    private static final String TAG_VALUE = "value";
113    private static final String ATTR_KEY = "key";
114    private static final String ATTR_VALUE_TYPE = "type";
115    private static final String ATTR_MULTIPLE = "m";
116
117    private static final String ATTR_TYPE_STRING_ARRAY = "sa";
118    private static final String ATTR_TYPE_STRING = "s";
119    private static final String ATTR_TYPE_BOOLEAN = "b";
120    private static final String ATTR_TYPE_INTEGER = "i";
121    private static final String ATTR_TYPE_BUNDLE = "B";
122    private static final String ATTR_TYPE_BUNDLE_ARRAY = "BA";
123
124    private static final String USER_INFO_DIR = "system" + File.separator + "users";
125    private static final String USER_LIST_FILENAME = "userlist.xml";
126    private static final String USER_PHOTO_FILENAME = "photo.png";
127    private static final String USER_PHOTO_FILENAME_TMP = USER_PHOTO_FILENAME + ".tmp";
128
129    private static final String RESTRICTIONS_FILE_PREFIX = "res_";
130    private static final String XML_SUFFIX = ".xml";
131
132    private static final int MIN_USER_ID = 10;
133
134    private static final int USER_VERSION = 6;
135
136    private static final long EPOCH_PLUS_30_YEARS = 30L * 365 * 24 * 60 * 60 * 1000L; // ms
137
138    // Maximum number of managed profiles permitted per user is 1. This cannot be increased
139    // without first making sure that the rest of the framework is prepared for it.
140    private static final int MAX_MANAGED_PROFILES = 1;
141
142    /**
143     * Flag indicating whether device credentials are shared among same-user profiles.
144     */
145    private static final boolean CONFIG_PROFILES_SHARE_CREDENTIAL = true;
146
147    // Set of user restrictions, which can only be enforced by the system
148    private static final Set<String> SYSTEM_CONTROLLED_RESTRICTIONS = Sets.newArraySet(
149            UserManager.DISALLOW_RECORD_AUDIO);
150
151    static final int WRITE_USER_MSG = 1;
152    static final int WRITE_USER_DELAY = 2*1000;  // 2 seconds
153
154    private static final String XATTR_SERIAL = "user.serial";
155
156    private final Context mContext;
157    private final PackageManagerService mPm;
158    private final Object mInstallLock;
159    private final Object mPackagesLock;
160
161    private final Handler mHandler;
162
163    private final File mUsersDir;
164    private final File mUserListFile;
165
166    private final SparseArray<UserInfo> mUsers = new SparseArray<UserInfo>();
167    private final SparseArray<Bundle> mUserRestrictions = new SparseArray<Bundle>();
168    private final Bundle mGuestRestrictions = new Bundle();
169
170    /**
171     * Set of user IDs being actively removed. Removed IDs linger in this set
172     * for several seconds to work around a VFS caching issue.
173     */
174    // @GuardedBy("mPackagesLock")
175    private final SparseBooleanArray mRemovingUserIds = new SparseBooleanArray();
176
177    private int[] mUserIds;
178    private int mNextSerialNumber;
179    private int mUserVersion = 0;
180
181    private IAppOpsService mAppOpsService;
182
183    private static UserManagerService sInstance;
184
185    public static UserManagerService getInstance() {
186        synchronized (UserManagerService.class) {
187            return sInstance;
188        }
189    }
190
191    /**
192     * Available for testing purposes.
193     */
194    UserManagerService(File dataDir, File baseUserPath) {
195        this(null, null, new Object(), new Object(), dataDir, baseUserPath);
196    }
197
198    /**
199     * Called by package manager to create the service.  This is closely
200     * associated with the package manager, and the given lock is the
201     * package manager's own lock.
202     */
203    UserManagerService(Context context, PackageManagerService pm,
204            Object installLock, Object packagesLock) {
205        this(context, pm, installLock, packagesLock,
206                Environment.getDataDirectory(),
207                new File(Environment.getDataDirectory(), "user"));
208    }
209
210    /**
211     * Available for testing purposes.
212     */
213    private UserManagerService(Context context, PackageManagerService pm,
214            Object installLock, Object packagesLock,
215            File dataDir, File baseUserPath) {
216        mContext = context;
217        mPm = pm;
218        mInstallLock = installLock;
219        mPackagesLock = packagesLock;
220        mHandler = new MainHandler();
221        synchronized (mInstallLock) {
222            synchronized (mPackagesLock) {
223                mUsersDir = new File(dataDir, USER_INFO_DIR);
224                mUsersDir.mkdirs();
225                // Make zeroth user directory, for services to migrate their files to that location
226                File userZeroDir = new File(mUsersDir, String.valueOf(UserHandle.USER_SYSTEM));
227                userZeroDir.mkdirs();
228                FileUtils.setPermissions(mUsersDir.toString(),
229                        FileUtils.S_IRWXU|FileUtils.S_IRWXG
230                        |FileUtils.S_IROTH|FileUtils.S_IXOTH,
231                        -1, -1);
232                mUserListFile = new File(mUsersDir, USER_LIST_FILENAME);
233                initDefaultGuestRestrictions();
234                readUserListLocked();
235                sInstance = this;
236            }
237        }
238    }
239
240    void systemReady() {
241        synchronized (mInstallLock) {
242            synchronized (mPackagesLock) {
243                // Prune out any partially created/partially removed users.
244                ArrayList<UserInfo> partials = new ArrayList<UserInfo>();
245                for (int i = 0; i < mUsers.size(); i++) {
246                    UserInfo ui = mUsers.valueAt(i);
247                    if ((ui.partial || ui.guestToRemove) && i != 0) {
248                        partials.add(ui);
249                    }
250                }
251                for (int i = 0; i < partials.size(); i++) {
252                    UserInfo ui = partials.get(i);
253                    Slog.w(LOG_TAG, "Removing partially created user " + ui.id
254                            + " (name=" + ui.name + ")");
255                    removeUserStateLocked(ui.id);
256                }
257            }
258        }
259        onUserForeground(UserHandle.USER_SYSTEM);
260        mAppOpsService = IAppOpsService.Stub.asInterface(
261                ServiceManager.getService(Context.APP_OPS_SERVICE));
262        for (int i = 0; i < mUserIds.length; ++i) {
263            try {
264                mAppOpsService.setUserRestrictions(mUserRestrictions.get(mUserIds[i]), mUserIds[i]);
265            } catch (RemoteException e) {
266                Log.w(LOG_TAG, "Unable to notify AppOpsService of UserRestrictions");
267            }
268        }
269    }
270
271    @Override
272    public UserInfo getPrimaryUser() {
273        checkManageUsersPermission("query users");
274        synchronized (mPackagesLock) {
275            for (int i = 0; i < mUsers.size(); i++) {
276                UserInfo ui = mUsers.valueAt(i);
277                if (ui.isPrimary()) {
278                    return ui;
279                }
280            }
281        }
282        return null;
283    }
284
285    @Override
286    public @NonNull List<UserInfo> getUsers(boolean excludeDying) {
287        checkManageUsersPermission("query users");
288        synchronized (mPackagesLock) {
289            ArrayList<UserInfo> users = new ArrayList<UserInfo>(mUsers.size());
290            for (int i = 0; i < mUsers.size(); i++) {
291                UserInfo ui = mUsers.valueAt(i);
292                if (ui.partial) {
293                    continue;
294                }
295                if (!excludeDying || !mRemovingUserIds.get(ui.id)) {
296                    users.add(ui);
297                }
298            }
299            return users;
300        }
301    }
302
303    @Override
304    public List<UserInfo> getProfiles(int userId, boolean enabledOnly) {
305        if (userId != UserHandle.getCallingUserId()) {
306            checkManageUsersPermission("getting profiles related to user " + userId);
307        }
308        final long ident = Binder.clearCallingIdentity();
309        try {
310            synchronized (mPackagesLock) {
311                return getProfilesLocked(userId, enabledOnly);
312            }
313        } finally {
314            Binder.restoreCallingIdentity(ident);
315        }
316    }
317
318    /** Assume permissions already checked and caller's identity cleared */
319    private List<UserInfo> getProfilesLocked(int userId, boolean enabledOnly) {
320        UserInfo user = getUserInfoLocked(userId);
321        ArrayList<UserInfo> users = new ArrayList<UserInfo>(mUsers.size());
322        if (user == null) {
323            // Probably a dying user
324            return users;
325        }
326        for (int i = 0; i < mUsers.size(); i++) {
327            UserInfo profile = mUsers.valueAt(i);
328            if (!isProfileOf(user, profile)) {
329                continue;
330            }
331            if (enabledOnly && !profile.isEnabled()) {
332                continue;
333            }
334            if (mRemovingUserIds.get(profile.id)) {
335                continue;
336            }
337            users.add(profile);
338        }
339        return users;
340    }
341
342    @Override
343    public int getCredentialOwnerProfile(int userHandle) {
344        checkManageUsersPermission("get the credential owner");
345        if (CONFIG_PROFILES_SHARE_CREDENTIAL) {
346            synchronized (mPackagesLock) {
347                UserInfo profileParent = getProfileParentLocked(userHandle);
348                if (profileParent != null) {
349                    return profileParent.id;
350                }
351            }
352        }
353
354        return userHandle;
355    }
356
357    @Override
358    public UserInfo getProfileParent(int userHandle) {
359        checkManageUsersPermission("get the profile parent");
360        synchronized (mPackagesLock) {
361            return getProfileParentLocked(userHandle);
362        }
363    }
364
365    private UserInfo getProfileParentLocked(int userHandle) {
366        UserInfo profile = getUserInfoLocked(userHandle);
367        if (profile == null) {
368            return null;
369        }
370        int parentUserId = profile.profileGroupId;
371        if (parentUserId == UserInfo.NO_PROFILE_GROUP_ID) {
372            return null;
373        } else {
374            return getUserInfoLocked(parentUserId);
375        }
376    }
377
378    private boolean isProfileOf(UserInfo user, UserInfo profile) {
379        return user.id == profile.id ||
380                (user.profileGroupId != UserInfo.NO_PROFILE_GROUP_ID
381                && user.profileGroupId == profile.profileGroupId);
382    }
383
384    @Override
385    public void setUserEnabled(int userId) {
386        checkManageUsersPermission("enable user");
387        synchronized (mPackagesLock) {
388            UserInfo info = getUserInfoLocked(userId);
389            if (info != null && !info.isEnabled()) {
390                info.flags ^= UserInfo.FLAG_DISABLED;
391                writeUserLocked(info);
392            }
393        }
394    }
395
396    @Override
397    public UserInfo getUserInfo(int userId) {
398        checkManageUsersPermission("query user");
399        synchronized (mPackagesLock) {
400            return getUserInfoLocked(userId);
401        }
402    }
403
404    @Override
405    public boolean isRestricted() {
406        synchronized (mPackagesLock) {
407            return getUserInfoLocked(UserHandle.getCallingUserId()).isRestricted();
408        }
409    }
410
411    @Override
412    public boolean canHaveRestrictedProfile(int userId) {
413        checkManageUsersPermission("canHaveRestrictedProfile");
414        synchronized (mPackagesLock) {
415            final UserInfo userInfo = getUserInfoLocked(userId);
416            if (userInfo == null || !userInfo.canHaveProfile()) {
417                return false;
418            }
419            if (!userInfo.isAdmin()) {
420                return false;
421            }
422        }
423        DevicePolicyManager dpm = (DevicePolicyManager) mContext.getSystemService(
424                Context.DEVICE_POLICY_SERVICE);
425        // restricted profile can be created if there is no DO set and the admin user has no PO
426        return dpm.getDeviceOwner() == null && dpm.getProfileOwnerAsUser(userId) == null;
427    }
428
429    /*
430     * Should be locked on mUsers before calling this.
431     */
432    private UserInfo getUserInfoLocked(int userId) {
433        UserInfo ui = mUsers.get(userId);
434        // If it is partial and not in the process of being removed, return as unknown user.
435        if (ui != null && ui.partial && !mRemovingUserIds.get(userId)) {
436            Slog.w(LOG_TAG, "getUserInfo: unknown user #" + userId);
437            return null;
438        }
439        return ui;
440    }
441
442    /** Called by PackageManagerService */
443    public boolean exists(int userId) {
444        synchronized (mPackagesLock) {
445            return mUsers.get(userId) != null;
446        }
447    }
448
449    @Override
450    public void setUserName(int userId, String name) {
451        checkManageUsersPermission("rename users");
452        boolean changed = false;
453        synchronized (mPackagesLock) {
454            UserInfo info = mUsers.get(userId);
455            if (info == null || info.partial) {
456                Slog.w(LOG_TAG, "setUserName: unknown user #" + userId);
457                return;
458            }
459            if (name != null && !name.equals(info.name)) {
460                info.name = name;
461                writeUserLocked(info);
462                changed = true;
463            }
464        }
465        if (changed) {
466            sendUserInfoChangedBroadcast(userId);
467        }
468    }
469
470    @Override
471    public void setUserIcon(int userId, Bitmap bitmap) {
472        checkManageUsersPermission("update users");
473        long ident = Binder.clearCallingIdentity();
474        try {
475            synchronized (mPackagesLock) {
476                UserInfo info = mUsers.get(userId);
477                if (info == null || info.partial) {
478                    Slog.w(LOG_TAG, "setUserIcon: unknown user #" + userId);
479                    return;
480                }
481                writeBitmapLocked(info, bitmap);
482                writeUserLocked(info);
483            }
484            sendUserInfoChangedBroadcast(userId);
485        } finally {
486            Binder.restoreCallingIdentity(ident);
487        }
488    }
489
490    private void sendUserInfoChangedBroadcast(int userId) {
491        Intent changedIntent = new Intent(Intent.ACTION_USER_INFO_CHANGED);
492        changedIntent.putExtra(Intent.EXTRA_USER_HANDLE, userId);
493        changedIntent.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY);
494        mContext.sendBroadcastAsUser(changedIntent, UserHandle.ALL);
495    }
496
497    @Override
498    public ParcelFileDescriptor getUserIcon(int userId) {
499        String iconPath;
500        synchronized (mPackagesLock) {
501            UserInfo info = mUsers.get(userId);
502            if (info == null || info.partial) {
503                Slog.w(LOG_TAG, "getUserIcon: unknown user #" + userId);
504                return null;
505            }
506            int callingGroupId = mUsers.get(UserHandle.getCallingUserId()).profileGroupId;
507            if (callingGroupId == UserInfo.NO_PROFILE_GROUP_ID
508                    || callingGroupId != info.profileGroupId) {
509                checkManageUsersPermission("get the icon of a user who is not related");
510            }
511            if (info.iconPath == null) {
512                return null;
513            }
514            iconPath = info.iconPath;
515        }
516
517        try {
518            return ParcelFileDescriptor.open(
519                    new File(iconPath), ParcelFileDescriptor.MODE_READ_ONLY);
520        } catch (FileNotFoundException e) {
521            Log.e(LOG_TAG, "Couldn't find icon file", e);
522        }
523        return null;
524    }
525
526    public void makeInitialized(int userId) {
527        checkManageUsersPermission("makeInitialized");
528        synchronized (mPackagesLock) {
529            UserInfo info = mUsers.get(userId);
530            if (info == null || info.partial) {
531                Slog.w(LOG_TAG, "makeInitialized: unknown user #" + userId);
532            }
533            if ((info.flags&UserInfo.FLAG_INITIALIZED) == 0) {
534                info.flags |= UserInfo.FLAG_INITIALIZED;
535                scheduleWriteUserLocked(info);
536            }
537        }
538    }
539
540    /**
541     * If default guest restrictions haven't been initialized yet, add the basic
542     * restrictions.
543     */
544    private void initDefaultGuestRestrictions() {
545        if (mGuestRestrictions.isEmpty()) {
546            mGuestRestrictions.putBoolean(UserManager.DISALLOW_OUTGOING_CALLS, true);
547            mGuestRestrictions.putBoolean(UserManager.DISALLOW_SMS, true);
548        }
549    }
550
551    @Override
552    public Bundle getDefaultGuestRestrictions() {
553        checkManageUsersPermission("getDefaultGuestRestrictions");
554        synchronized (mPackagesLock) {
555            return new Bundle(mGuestRestrictions);
556        }
557    }
558
559    @Override
560    public void setDefaultGuestRestrictions(Bundle restrictions) {
561        checkManageUsersPermission("setDefaultGuestRestrictions");
562        synchronized (mPackagesLock) {
563            mGuestRestrictions.clear();
564            mGuestRestrictions.putAll(restrictions);
565            writeUserListLocked();
566        }
567    }
568
569    @Override
570    public boolean hasUserRestriction(String restrictionKey, int userId) {
571        synchronized (mPackagesLock) {
572            Bundle restrictions = mUserRestrictions.get(userId);
573            return restrictions != null && restrictions.getBoolean(restrictionKey);
574        }
575    }
576
577    @Override
578    public Bundle getUserRestrictions(int userId) {
579        synchronized (mPackagesLock) {
580            Bundle restrictions = mUserRestrictions.get(userId);
581            return restrictions != null ? new Bundle(restrictions) : new Bundle();
582        }
583    }
584
585    @Override
586    public void setUserRestriction(String key, boolean value, int userId) {
587        checkManageUsersPermission("setUserRestriction");
588        synchronized (mPackagesLock) {
589            if (!SYSTEM_CONTROLLED_RESTRICTIONS.contains(key)) {
590                Bundle restrictions = getUserRestrictions(userId);
591                restrictions.putBoolean(key, value);
592                setUserRestrictionsInternalLocked(restrictions, userId);
593            }
594        }
595    }
596
597    @Override
598    public void setSystemControlledUserRestriction(String key, boolean value, int userId) {
599        checkSystemOrRoot("setSystemControlledUserRestriction");
600        synchronized (mPackagesLock) {
601            Bundle restrictions = getUserRestrictions(userId);
602            restrictions.putBoolean(key, value);
603            setUserRestrictionsInternalLocked(restrictions, userId);
604        }
605    }
606
607    @Override
608    public void setUserRestrictions(Bundle restrictions, int userId) {
609        checkManageUsersPermission("setUserRestrictions");
610        if (restrictions == null) return;
611
612        synchronized (mPackagesLock) {
613            final Bundle oldUserRestrictions = mUserRestrictions.get(userId);
614            // Restore the original state of system controlled restrictions from oldUserRestrictions
615            for (String key : SYSTEM_CONTROLLED_RESTRICTIONS) {
616                restrictions.remove(key);
617                if (oldUserRestrictions.containsKey(key)) {
618                    restrictions.putBoolean(key, oldUserRestrictions.getBoolean(key));
619                }
620            }
621            setUserRestrictionsInternalLocked(restrictions, userId);
622        }
623    }
624
625    private void setUserRestrictionsInternalLocked(Bundle restrictions, int userId) {
626        final Bundle userRestrictions = mUserRestrictions.get(userId);
627        userRestrictions.clear();
628        userRestrictions.putAll(restrictions);
629        long token = Binder.clearCallingIdentity();
630        try {
631        mAppOpsService.setUserRestrictions(userRestrictions, userId);
632        } catch (RemoteException e) {
633            Log.w(LOG_TAG, "Unable to notify AppOpsService of UserRestrictions");
634        } finally {
635            Binder.restoreCallingIdentity(token);
636        }
637        scheduleWriteUserLocked(mUsers.get(userId));
638    }
639
640    /**
641     * Check if we've hit the limit of how many users can be created.
642     */
643    private boolean isUserLimitReachedLocked() {
644        return getAliveUsersExcludingGuestsCountLocked() >= UserManager.getMaxSupportedUsers();
645    }
646
647    @Override
648    public boolean canAddMoreManagedProfiles(int userId) {
649        checkManageUsersPermission("check if more managed profiles can be added.");
650        if (ActivityManager.isLowRamDeviceStatic()) {
651            return false;
652        }
653        if (!mContext.getPackageManager().hasSystemFeature(
654                PackageManager.FEATURE_MANAGED_USERS)) {
655            return false;
656        }
657        // Limit number of managed profiles that can be created
658        int managedProfilesCount = getProfiles(userId, true).size() - 1;
659        if (managedProfilesCount >= MAX_MANAGED_PROFILES) {
660            return false;
661        }
662        synchronized(mPackagesLock) {
663            UserInfo userInfo = getUserInfoLocked(userId);
664            if (!userInfo.canHaveProfile()) {
665                return false;
666            }
667            int usersCount = getAliveUsersExcludingGuestsCountLocked();
668            // We allow creating a managed profile in the special case where there is only one user.
669            return usersCount == 1 || usersCount < UserManager.getMaxSupportedUsers();
670        }
671    }
672
673    private int getAliveUsersExcludingGuestsCountLocked() {
674        int aliveUserCount = 0;
675        final int totalUserCount = mUsers.size();
676        // Skip over users being removed
677        for (int i = 0; i < totalUserCount; i++) {
678            UserInfo user = mUsers.valueAt(i);
679            if (!mRemovingUserIds.get(user.id)
680                    && !user.isGuest() && !user.partial) {
681                aliveUserCount++;
682            }
683        }
684        return aliveUserCount;
685    }
686
687    /**
688     * Enforces that only the system UID or root's UID or apps that have the
689     * {@link android.Manifest.permission#MANAGE_USERS MANAGE_USERS}
690     * permission can make certain calls to the UserManager.
691     *
692     * @param message used as message if SecurityException is thrown
693     * @throws SecurityException if the caller is not system or root
694     */
695    private static final void checkManageUsersPermission(String message) {
696        final int uid = Binder.getCallingUid();
697        if (uid != Process.SYSTEM_UID && uid != 0
698                && ActivityManager.checkComponentPermission(
699                        android.Manifest.permission.MANAGE_USERS,
700                        uid, -1, true) != PackageManager.PERMISSION_GRANTED) {
701            throw new SecurityException("You need MANAGE_USERS permission to: " + message);
702        }
703    }
704
705    private static void checkSystemOrRoot(String message) {
706        final int uid = Binder.getCallingUid();
707        if (uid != Process.SYSTEM_UID && uid != 0) {
708            throw new SecurityException("Only system may call: " + message);
709        }
710    }
711
712    private void writeBitmapLocked(UserInfo info, Bitmap bitmap) {
713        try {
714            File dir = new File(mUsersDir, Integer.toString(info.id));
715            File file = new File(dir, USER_PHOTO_FILENAME);
716            File tmp = new File(dir, USER_PHOTO_FILENAME_TMP);
717            if (!dir.exists()) {
718                dir.mkdir();
719                FileUtils.setPermissions(
720                        dir.getPath(),
721                        FileUtils.S_IRWXU|FileUtils.S_IRWXG|FileUtils.S_IXOTH,
722                        -1, -1);
723            }
724            FileOutputStream os;
725            if (bitmap.compress(Bitmap.CompressFormat.PNG, 100, os = new FileOutputStream(tmp))
726                    && tmp.renameTo(file)) {
727                info.iconPath = file.getAbsolutePath();
728            }
729            try {
730                os.close();
731            } catch (IOException ioe) {
732                // What the ... !
733            }
734            tmp.delete();
735        } catch (FileNotFoundException e) {
736            Slog.w(LOG_TAG, "Error setting photo for user ", e);
737        }
738    }
739
740    /**
741     * Returns an array of user ids. This array is cached here for quick access, so do not modify or
742     * cache it elsewhere.
743     * @return the array of user ids.
744     */
745    public int[] getUserIds() {
746        synchronized (mPackagesLock) {
747            return mUserIds;
748        }
749    }
750
751    int[] getUserIdsLPr() {
752        return mUserIds;
753    }
754
755    private void readUserListLocked() {
756        if (!mUserListFile.exists()) {
757            fallbackToSingleUserLocked();
758            return;
759        }
760        FileInputStream fis = null;
761        AtomicFile userListFile = new AtomicFile(mUserListFile);
762        try {
763            fis = userListFile.openRead();
764            XmlPullParser parser = Xml.newPullParser();
765            parser.setInput(fis, StandardCharsets.UTF_8.name());
766            int type;
767            while ((type = parser.next()) != XmlPullParser.START_TAG
768                    && type != XmlPullParser.END_DOCUMENT) {
769                ;
770            }
771
772            if (type != XmlPullParser.START_TAG) {
773                Slog.e(LOG_TAG, "Unable to read user list");
774                fallbackToSingleUserLocked();
775                return;
776            }
777
778            mNextSerialNumber = -1;
779            if (parser.getName().equals(TAG_USERS)) {
780                String lastSerialNumber = parser.getAttributeValue(null, ATTR_NEXT_SERIAL_NO);
781                if (lastSerialNumber != null) {
782                    mNextSerialNumber = Integer.parseInt(lastSerialNumber);
783                }
784                String versionNumber = parser.getAttributeValue(null, ATTR_USER_VERSION);
785                if (versionNumber != null) {
786                    mUserVersion = Integer.parseInt(versionNumber);
787                }
788            }
789
790            while ((type = parser.next()) != XmlPullParser.END_DOCUMENT) {
791                if (type == XmlPullParser.START_TAG) {
792                    final String name = parser.getName();
793                    if (name.equals(TAG_USER)) {
794                        String id = parser.getAttributeValue(null, ATTR_ID);
795                        UserInfo user = readUserLocked(Integer.parseInt(id));
796
797                        if (user != null) {
798                            mUsers.put(user.id, user);
799                            if (mNextSerialNumber < 0 || mNextSerialNumber <= user.id) {
800                                mNextSerialNumber = user.id + 1;
801                            }
802                        }
803                    } else if (name.equals(TAG_GUEST_RESTRICTIONS)) {
804                        while ((type = parser.next()) != XmlPullParser.END_DOCUMENT
805                                && type != XmlPullParser.END_TAG) {
806                            if (type == XmlPullParser.START_TAG) {
807                                if (parser.getName().equals(TAG_RESTRICTIONS)) {
808                                    readRestrictionsLocked(parser, mGuestRestrictions);
809                                }
810                                break;
811                            }
812                        }
813                    }
814                }
815            }
816            updateUserIdsLocked();
817            upgradeIfNecessaryLocked();
818        } catch (IOException ioe) {
819            fallbackToSingleUserLocked();
820        } catch (XmlPullParserException pe) {
821            fallbackToSingleUserLocked();
822        } finally {
823            if (fis != null) {
824                try {
825                    fis.close();
826                } catch (IOException e) {
827                }
828            }
829        }
830    }
831
832    /**
833     * Upgrade steps between versions, either for fixing bugs or changing the data format.
834     */
835    private void upgradeIfNecessaryLocked() {
836        int userVersion = mUserVersion;
837        if (userVersion < 1) {
838            // Assign a proper name for the owner, if not initialized correctly before
839            UserInfo user = mUsers.get(UserHandle.USER_OWNER);
840            if ("Primary".equals(user.name)) {
841                user.name = mContext.getResources().getString(com.android.internal.R.string.owner_name);
842                scheduleWriteUserLocked(user);
843            }
844            userVersion = 1;
845        }
846
847        if (userVersion < 2) {
848            // Owner should be marked as initialized
849            UserInfo user = mUsers.get(UserHandle.USER_OWNER);
850            if ((user.flags & UserInfo.FLAG_INITIALIZED) == 0) {
851                user.flags |= UserInfo.FLAG_INITIALIZED;
852                scheduleWriteUserLocked(user);
853            }
854            userVersion = 2;
855        }
856
857
858        if (userVersion < 4) {
859            userVersion = 4;
860        }
861
862        if (userVersion < 5) {
863            initDefaultGuestRestrictions();
864            userVersion = 5;
865        }
866
867        if (userVersion < 6) {
868            final boolean splitSystemUser = UserManager.isSplitSystemUser();
869            for (int i = 0; i < mUsers.size(); i++) {
870                UserInfo user = mUsers.valueAt(i);
871                // In non-split mode, only user 0 can have restricted profiles
872                if (!splitSystemUser && user.isRestricted()
873                        && (user.restrictedProfileParentId == UserInfo.NO_PROFILE_GROUP_ID)) {
874                    user.restrictedProfileParentId = UserHandle.USER_SYSTEM;
875                    scheduleWriteUserLocked(user);
876                }
877            }
878            userVersion = 6;
879        }
880
881        if (userVersion < USER_VERSION) {
882            Slog.w(LOG_TAG, "User version " + mUserVersion + " didn't upgrade as expected to "
883                    + USER_VERSION);
884        } else {
885            mUserVersion = userVersion;
886            writeUserListLocked();
887        }
888    }
889
890    private void fallbackToSingleUserLocked() {
891        int flags = UserInfo.FLAG_INITIALIZED;
892        // In split system user mode, the admin and primary flags are assigned to the first human
893        // user.
894        if (!UserManager.isSplitSystemUser()) {
895            flags |= UserInfo.FLAG_ADMIN | UserInfo.FLAG_PRIMARY;
896        }
897        // Create the system user
898        UserInfo system = new UserInfo(UserHandle.USER_SYSTEM,
899                mContext.getResources().getString(com.android.internal.R.string.owner_name), null,
900                flags);
901        mUsers.put(system.id, system);
902        mNextSerialNumber = MIN_USER_ID;
903        mUserVersion = USER_VERSION;
904
905        Bundle restrictions = new Bundle();
906        mUserRestrictions.append(UserHandle.USER_SYSTEM, restrictions);
907
908        updateUserIdsLocked();
909        initDefaultGuestRestrictions();
910
911        writeUserListLocked();
912        writeUserLocked(system);
913    }
914
915    private void scheduleWriteUserLocked(UserInfo userInfo) {
916        if (!mHandler.hasMessages(WRITE_USER_MSG, userInfo)) {
917            Message msg = mHandler.obtainMessage(WRITE_USER_MSG, userInfo);
918            mHandler.sendMessageDelayed(msg, WRITE_USER_DELAY);
919        }
920    }
921
922    /*
923     * Writes the user file in this format:
924     *
925     * <user flags="20039023" id="0">
926     *   <name>Primary</name>
927     * </user>
928     */
929    private void writeUserLocked(UserInfo userInfo) {
930        FileOutputStream fos = null;
931        AtomicFile userFile = new AtomicFile(new File(mUsersDir, userInfo.id + XML_SUFFIX));
932        try {
933            fos = userFile.startWrite();
934            final BufferedOutputStream bos = new BufferedOutputStream(fos);
935
936            // XmlSerializer serializer = XmlUtils.serializerInstance();
937            final XmlSerializer serializer = new FastXmlSerializer();
938            serializer.setOutput(bos, StandardCharsets.UTF_8.name());
939            serializer.startDocument(null, true);
940            serializer.setFeature("http://xmlpull.org/v1/doc/features.html#indent-output", true);
941
942            serializer.startTag(null, TAG_USER);
943            serializer.attribute(null, ATTR_ID, Integer.toString(userInfo.id));
944            serializer.attribute(null, ATTR_SERIAL_NO, Integer.toString(userInfo.serialNumber));
945            serializer.attribute(null, ATTR_FLAGS, Integer.toString(userInfo.flags));
946            serializer.attribute(null, ATTR_CREATION_TIME, Long.toString(userInfo.creationTime));
947            serializer.attribute(null, ATTR_LAST_LOGGED_IN_TIME,
948                    Long.toString(userInfo.lastLoggedInTime));
949            if (userInfo.iconPath != null) {
950                serializer.attribute(null,  ATTR_ICON_PATH, userInfo.iconPath);
951            }
952            if (userInfo.partial) {
953                serializer.attribute(null, ATTR_PARTIAL, "true");
954            }
955            if (userInfo.guestToRemove) {
956                serializer.attribute(null, ATTR_GUEST_TO_REMOVE, "true");
957            }
958            if (userInfo.profileGroupId != UserInfo.NO_PROFILE_GROUP_ID) {
959                serializer.attribute(null, ATTR_PROFILE_GROUP_ID,
960                        Integer.toString(userInfo.profileGroupId));
961            }
962            if (userInfo.restrictedProfileParentId != UserInfo.NO_PROFILE_GROUP_ID) {
963                serializer.attribute(null, ATTR_RESTRICTED_PROFILE_PARENT_ID,
964                        Integer.toString(userInfo.restrictedProfileParentId));
965            }
966            serializer.startTag(null, TAG_NAME);
967            serializer.text(userInfo.name);
968            serializer.endTag(null, TAG_NAME);
969            Bundle restrictions = mUserRestrictions.get(userInfo.id);
970            if (restrictions != null) {
971                writeRestrictionsLocked(serializer, restrictions);
972            }
973            serializer.endTag(null, TAG_USER);
974
975            serializer.endDocument();
976            userFile.finishWrite(fos);
977        } catch (Exception ioe) {
978            Slog.e(LOG_TAG, "Error writing user info " + userInfo.id + "\n" + ioe);
979            userFile.failWrite(fos);
980        }
981    }
982
983    /*
984     * Writes the user list file in this format:
985     *
986     * <users nextSerialNumber="3">
987     *   <user id="0"></user>
988     *   <user id="2"></user>
989     * </users>
990     */
991    private void writeUserListLocked() {
992        FileOutputStream fos = null;
993        AtomicFile userListFile = new AtomicFile(mUserListFile);
994        try {
995            fos = userListFile.startWrite();
996            final BufferedOutputStream bos = new BufferedOutputStream(fos);
997
998            // XmlSerializer serializer = XmlUtils.serializerInstance();
999            final XmlSerializer serializer = new FastXmlSerializer();
1000            serializer.setOutput(bos, StandardCharsets.UTF_8.name());
1001            serializer.startDocument(null, true);
1002            serializer.setFeature("http://xmlpull.org/v1/doc/features.html#indent-output", true);
1003
1004            serializer.startTag(null, TAG_USERS);
1005            serializer.attribute(null, ATTR_NEXT_SERIAL_NO, Integer.toString(mNextSerialNumber));
1006            serializer.attribute(null, ATTR_USER_VERSION, Integer.toString(mUserVersion));
1007
1008            serializer.startTag(null, TAG_GUEST_RESTRICTIONS);
1009            writeRestrictionsLocked(serializer, mGuestRestrictions);
1010            serializer.endTag(null, TAG_GUEST_RESTRICTIONS);
1011            for (int i = 0; i < mUsers.size(); i++) {
1012                UserInfo user = mUsers.valueAt(i);
1013                serializer.startTag(null, TAG_USER);
1014                serializer.attribute(null, ATTR_ID, Integer.toString(user.id));
1015                serializer.endTag(null, TAG_USER);
1016            }
1017
1018            serializer.endTag(null, TAG_USERS);
1019
1020            serializer.endDocument();
1021            userListFile.finishWrite(fos);
1022        } catch (Exception e) {
1023            userListFile.failWrite(fos);
1024            Slog.e(LOG_TAG, "Error writing user list");
1025        }
1026    }
1027
1028    private void writeRestrictionsLocked(XmlSerializer serializer, Bundle restrictions)
1029            throws IOException {
1030        serializer.startTag(null, TAG_RESTRICTIONS);
1031        writeBoolean(serializer, restrictions, UserManager.DISALLOW_CONFIG_WIFI);
1032        writeBoolean(serializer, restrictions, UserManager.DISALLOW_MODIFY_ACCOUNTS);
1033        writeBoolean(serializer, restrictions, UserManager.DISALLOW_INSTALL_APPS);
1034        writeBoolean(serializer, restrictions, UserManager.DISALLOW_UNINSTALL_APPS);
1035        writeBoolean(serializer, restrictions, UserManager.DISALLOW_SHARE_LOCATION);
1036        writeBoolean(serializer, restrictions,
1037                UserManager.DISALLOW_INSTALL_UNKNOWN_SOURCES);
1038        writeBoolean(serializer, restrictions, UserManager.DISALLOW_CONFIG_BLUETOOTH);
1039        writeBoolean(serializer, restrictions, UserManager.DISALLOW_USB_FILE_TRANSFER);
1040        writeBoolean(serializer, restrictions, UserManager.DISALLOW_CONFIG_CREDENTIALS);
1041        writeBoolean(serializer, restrictions, UserManager.DISALLOW_REMOVE_USER);
1042        writeBoolean(serializer, restrictions, UserManager.DISALLOW_DEBUGGING_FEATURES);
1043        writeBoolean(serializer, restrictions, UserManager.DISALLOW_CONFIG_VPN);
1044        writeBoolean(serializer, restrictions, UserManager.DISALLOW_CONFIG_TETHERING);
1045        writeBoolean(serializer, restrictions, UserManager.DISALLOW_NETWORK_RESET);
1046        writeBoolean(serializer, restrictions, UserManager.DISALLOW_FACTORY_RESET);
1047        writeBoolean(serializer, restrictions, UserManager.DISALLOW_ADD_USER);
1048        writeBoolean(serializer, restrictions, UserManager.ENSURE_VERIFY_APPS);
1049        writeBoolean(serializer, restrictions, UserManager.DISALLOW_CONFIG_CELL_BROADCASTS);
1050        writeBoolean(serializer, restrictions, UserManager.DISALLOW_CONFIG_MOBILE_NETWORKS);
1051        writeBoolean(serializer, restrictions, UserManager.DISALLOW_APPS_CONTROL);
1052        writeBoolean(serializer, restrictions, UserManager.DISALLOW_MOUNT_PHYSICAL_MEDIA);
1053        writeBoolean(serializer, restrictions, UserManager.DISALLOW_UNMUTE_MICROPHONE);
1054        writeBoolean(serializer, restrictions, UserManager.DISALLOW_ADJUST_VOLUME);
1055        writeBoolean(serializer, restrictions, UserManager.DISALLOW_OUTGOING_CALLS);
1056        writeBoolean(serializer, restrictions, UserManager.DISALLOW_SMS);
1057        writeBoolean(serializer, restrictions, UserManager.DISALLOW_FUN);
1058        writeBoolean(serializer, restrictions, UserManager.DISALLOW_CREATE_WINDOWS);
1059        writeBoolean(serializer, restrictions, UserManager.DISALLOW_CROSS_PROFILE_COPY_PASTE);
1060        writeBoolean(serializer, restrictions, UserManager.DISALLOW_OUTGOING_BEAM);
1061        writeBoolean(serializer, restrictions, UserManager.DISALLOW_WALLPAPER);
1062        writeBoolean(serializer, restrictions, UserManager.DISALLOW_SAFE_BOOT);
1063        writeBoolean(serializer, restrictions, UserManager.ALLOW_PARENT_PROFILE_APP_LINKING);
1064        serializer.endTag(null, TAG_RESTRICTIONS);
1065    }
1066
1067    private UserInfo readUserLocked(int id) {
1068        int flags = 0;
1069        int serialNumber = id;
1070        String name = null;
1071        String iconPath = null;
1072        long creationTime = 0L;
1073        long lastLoggedInTime = 0L;
1074        int profileGroupId = UserInfo.NO_PROFILE_GROUP_ID;
1075        int restrictedProfileParentId = UserInfo.NO_PROFILE_GROUP_ID;
1076        boolean partial = false;
1077        boolean guestToRemove = false;
1078        Bundle restrictions = new Bundle();
1079
1080        FileInputStream fis = null;
1081        try {
1082            AtomicFile userFile =
1083                    new AtomicFile(new File(mUsersDir, Integer.toString(id) + XML_SUFFIX));
1084            fis = userFile.openRead();
1085            XmlPullParser parser = Xml.newPullParser();
1086            parser.setInput(fis, StandardCharsets.UTF_8.name());
1087            int type;
1088            while ((type = parser.next()) != XmlPullParser.START_TAG
1089                    && type != XmlPullParser.END_DOCUMENT) {
1090                ;
1091            }
1092
1093            if (type != XmlPullParser.START_TAG) {
1094                Slog.e(LOG_TAG, "Unable to read user " + id);
1095                return null;
1096            }
1097
1098            if (type == XmlPullParser.START_TAG && parser.getName().equals(TAG_USER)) {
1099                int storedId = readIntAttribute(parser, ATTR_ID, -1);
1100                if (storedId != id) {
1101                    Slog.e(LOG_TAG, "User id does not match the file name");
1102                    return null;
1103                }
1104                serialNumber = readIntAttribute(parser, ATTR_SERIAL_NO, id);
1105                flags = readIntAttribute(parser, ATTR_FLAGS, 0);
1106                iconPath = parser.getAttributeValue(null, ATTR_ICON_PATH);
1107                creationTime = readLongAttribute(parser, ATTR_CREATION_TIME, 0);
1108                lastLoggedInTime = readLongAttribute(parser, ATTR_LAST_LOGGED_IN_TIME, 0);
1109                profileGroupId = readIntAttribute(parser, ATTR_PROFILE_GROUP_ID,
1110                        UserInfo.NO_PROFILE_GROUP_ID);
1111                restrictedProfileParentId = readIntAttribute(parser,
1112                        ATTR_RESTRICTED_PROFILE_PARENT_ID, UserInfo.NO_PROFILE_GROUP_ID);
1113                String valueString = parser.getAttributeValue(null, ATTR_PARTIAL);
1114                if ("true".equals(valueString)) {
1115                    partial = true;
1116                }
1117                valueString = parser.getAttributeValue(null, ATTR_GUEST_TO_REMOVE);
1118                if ("true".equals(valueString)) {
1119                    guestToRemove = true;
1120                }
1121
1122                int outerDepth = parser.getDepth();
1123                while ((type = parser.next()) != XmlPullParser.END_DOCUMENT
1124                       && (type != XmlPullParser.END_TAG || parser.getDepth() > outerDepth)) {
1125                    if (type == XmlPullParser.END_TAG || type == XmlPullParser.TEXT) {
1126                        continue;
1127                    }
1128                    String tag = parser.getName();
1129                    if (TAG_NAME.equals(tag)) {
1130                        type = parser.next();
1131                        if (type == XmlPullParser.TEXT) {
1132                            name = parser.getText();
1133                        }
1134                    } else if (TAG_RESTRICTIONS.equals(tag)) {
1135                        readRestrictionsLocked(parser, restrictions);
1136                    }
1137                }
1138            }
1139
1140            UserInfo userInfo = new UserInfo(id, name, iconPath, flags);
1141            userInfo.serialNumber = serialNumber;
1142            userInfo.creationTime = creationTime;
1143            userInfo.lastLoggedInTime = lastLoggedInTime;
1144            userInfo.partial = partial;
1145            userInfo.guestToRemove = guestToRemove;
1146            userInfo.profileGroupId = profileGroupId;
1147            userInfo.restrictedProfileParentId = restrictedProfileParentId;
1148            mUserRestrictions.append(id, restrictions);
1149            return userInfo;
1150
1151        } catch (IOException ioe) {
1152        } catch (XmlPullParserException pe) {
1153        } finally {
1154            if (fis != null) {
1155                try {
1156                    fis.close();
1157                } catch (IOException e) {
1158                }
1159            }
1160        }
1161        return null;
1162    }
1163
1164    private void readRestrictionsLocked(XmlPullParser parser, Bundle restrictions)
1165            throws IOException {
1166        readBoolean(parser, restrictions, UserManager.DISALLOW_CONFIG_WIFI);
1167        readBoolean(parser, restrictions, UserManager.DISALLOW_MODIFY_ACCOUNTS);
1168        readBoolean(parser, restrictions, UserManager.DISALLOW_INSTALL_APPS);
1169        readBoolean(parser, restrictions, UserManager.DISALLOW_UNINSTALL_APPS);
1170        readBoolean(parser, restrictions, UserManager.DISALLOW_SHARE_LOCATION);
1171        readBoolean(parser, restrictions,
1172                UserManager.DISALLOW_INSTALL_UNKNOWN_SOURCES);
1173        readBoolean(parser, restrictions, UserManager.DISALLOW_CONFIG_BLUETOOTH);
1174        readBoolean(parser, restrictions, UserManager.DISALLOW_USB_FILE_TRANSFER);
1175        readBoolean(parser, restrictions, UserManager.DISALLOW_CONFIG_CREDENTIALS);
1176        readBoolean(parser, restrictions, UserManager.DISALLOW_REMOVE_USER);
1177        readBoolean(parser, restrictions, UserManager.DISALLOW_DEBUGGING_FEATURES);
1178        readBoolean(parser, restrictions, UserManager.DISALLOW_CONFIG_VPN);
1179        readBoolean(parser, restrictions, UserManager.DISALLOW_CONFIG_TETHERING);
1180        readBoolean(parser, restrictions, UserManager.DISALLOW_NETWORK_RESET);
1181        readBoolean(parser, restrictions, UserManager.DISALLOW_FACTORY_RESET);
1182        readBoolean(parser, restrictions, UserManager.DISALLOW_ADD_USER);
1183        readBoolean(parser, restrictions, UserManager.ENSURE_VERIFY_APPS);
1184        readBoolean(parser, restrictions, UserManager.DISALLOW_CONFIG_CELL_BROADCASTS);
1185        readBoolean(parser, restrictions, UserManager.DISALLOW_CONFIG_MOBILE_NETWORKS);
1186        readBoolean(parser, restrictions, UserManager.DISALLOW_APPS_CONTROL);
1187        readBoolean(parser, restrictions,
1188                UserManager.DISALLOW_MOUNT_PHYSICAL_MEDIA);
1189        readBoolean(parser, restrictions, UserManager.DISALLOW_UNMUTE_MICROPHONE);
1190        readBoolean(parser, restrictions, UserManager.DISALLOW_ADJUST_VOLUME);
1191        readBoolean(parser, restrictions, UserManager.DISALLOW_OUTGOING_CALLS);
1192        readBoolean(parser, restrictions, UserManager.DISALLOW_SMS);
1193        readBoolean(parser, restrictions, UserManager.DISALLOW_FUN);
1194        readBoolean(parser, restrictions, UserManager.DISALLOW_CREATE_WINDOWS);
1195        readBoolean(parser, restrictions, UserManager.DISALLOW_CROSS_PROFILE_COPY_PASTE);
1196        readBoolean(parser, restrictions, UserManager.DISALLOW_OUTGOING_BEAM);
1197        readBoolean(parser, restrictions, UserManager.DISALLOW_WALLPAPER);
1198        readBoolean(parser, restrictions, UserManager.DISALLOW_SAFE_BOOT);
1199        readBoolean(parser, restrictions, UserManager.ALLOW_PARENT_PROFILE_APP_LINKING);
1200    }
1201
1202    private void readBoolean(XmlPullParser parser, Bundle restrictions,
1203            String restrictionKey) {
1204        String value = parser.getAttributeValue(null, restrictionKey);
1205        if (value != null) {
1206            restrictions.putBoolean(restrictionKey, Boolean.parseBoolean(value));
1207        }
1208    }
1209
1210    private void writeBoolean(XmlSerializer xml, Bundle restrictions, String restrictionKey)
1211            throws IOException {
1212        if (restrictions.containsKey(restrictionKey)) {
1213            xml.attribute(null, restrictionKey,
1214                    Boolean.toString(restrictions.getBoolean(restrictionKey)));
1215        }
1216    }
1217
1218    private int readIntAttribute(XmlPullParser parser, String attr, int defaultValue) {
1219        String valueString = parser.getAttributeValue(null, attr);
1220        if (valueString == null) return defaultValue;
1221        try {
1222            return Integer.parseInt(valueString);
1223        } catch (NumberFormatException nfe) {
1224            return defaultValue;
1225        }
1226    }
1227
1228    private long readLongAttribute(XmlPullParser parser, String attr, long defaultValue) {
1229        String valueString = parser.getAttributeValue(null, attr);
1230        if (valueString == null) return defaultValue;
1231        try {
1232            return Long.parseLong(valueString);
1233        } catch (NumberFormatException nfe) {
1234            return defaultValue;
1235        }
1236    }
1237
1238    private boolean isPackageInstalled(String pkg, int userId) {
1239        final ApplicationInfo info = mPm.getApplicationInfo(pkg,
1240                PackageManager.GET_UNINSTALLED_PACKAGES,
1241                userId);
1242        if (info == null || (info.flags&ApplicationInfo.FLAG_INSTALLED) == 0) {
1243            return false;
1244        }
1245        return true;
1246    }
1247
1248    /**
1249     * Removes all the restrictions files (res_<packagename>) for a given user.
1250     * Does not do any permissions checking.
1251     */
1252    private void cleanAppRestrictions(int userId) {
1253        synchronized (mPackagesLock) {
1254            File dir = Environment.getUserSystemDirectory(userId);
1255            String[] files = dir.list();
1256            if (files == null) return;
1257            for (String fileName : files) {
1258                if (fileName.startsWith(RESTRICTIONS_FILE_PREFIX)) {
1259                    File resFile = new File(dir, fileName);
1260                    if (resFile.exists()) {
1261                        resFile.delete();
1262                    }
1263                }
1264            }
1265        }
1266    }
1267
1268    /**
1269     * Removes the app restrictions file for a specific package and user id, if it exists.
1270     */
1271    private void cleanAppRestrictionsForPackage(String pkg, int userId) {
1272        synchronized (mPackagesLock) {
1273            File dir = Environment.getUserSystemDirectory(userId);
1274            File resFile = new File(dir, packageToRestrictionsFileName(pkg));
1275            if (resFile.exists()) {
1276                resFile.delete();
1277            }
1278        }
1279    }
1280
1281    @Override
1282    public UserInfo createProfileForUser(String name, int flags, int userId) {
1283        checkManageUsersPermission("Only the system can create users");
1284        return createUserInternal(name, flags, userId);
1285    }
1286
1287    @Override
1288    public UserInfo createUser(String name, int flags) {
1289        checkManageUsersPermission("Only the system can create users");
1290        return createUserInternal(name, flags, UserHandle.USER_NULL);
1291    }
1292
1293    private UserInfo createUserInternal(String name, int flags, int parentId) {
1294        if (getUserRestrictions(UserHandle.getCallingUserId()).getBoolean(
1295                UserManager.DISALLOW_ADD_USER, false)) {
1296            Log.w(LOG_TAG, "Cannot add user. DISALLOW_ADD_USER is enabled.");
1297            return null;
1298        }
1299        if (ActivityManager.isLowRamDeviceStatic()) {
1300            return null;
1301        }
1302        final boolean isGuest = (flags & UserInfo.FLAG_GUEST) != 0;
1303        final boolean isManagedProfile = (flags & UserInfo.FLAG_MANAGED_PROFILE) != 0;
1304        final boolean isRestricted = (flags & UserInfo.FLAG_RESTRICTED) != 0;
1305        final long ident = Binder.clearCallingIdentity();
1306        UserInfo userInfo = null;
1307        final int userId;
1308        try {
1309            synchronized (mInstallLock) {
1310                synchronized (mPackagesLock) {
1311                    UserInfo parent = null;
1312                    if (parentId != UserHandle.USER_NULL) {
1313                        parent = getUserInfoLocked(parentId);
1314                        if (parent == null) return null;
1315                    }
1316                    if (isManagedProfile && !canAddMoreManagedProfiles(parentId)) {
1317                        Log.e(LOG_TAG, "Cannot add more managed profiles for user " + parentId);
1318                        return null;
1319                    }
1320                    if (!isGuest && !isManagedProfile && isUserLimitReachedLocked()) {
1321                        // If we're not adding a guest user or a managed profile and the limit has
1322                        // been reached, cannot add a user.
1323                        return null;
1324                    }
1325                    // If we're adding a guest and there already exists one, bail.
1326                    if (isGuest && findCurrentGuestUserLocked() != null) {
1327                        return null;
1328                    }
1329                    // In legacy mode, restricted profile's parent can only be the owner user
1330                    if (isRestricted && !UserManager.isSplitSystemUser()
1331                            && (parentId != UserHandle.USER_SYSTEM)) {
1332                        Log.w(LOG_TAG, "Cannot add restricted profile - parent user must be owner");
1333                        return null;
1334                    }
1335                    if (isRestricted && UserManager.isSplitSystemUser()) {
1336                        if (parent == null) {
1337                            Log.w(LOG_TAG, "Cannot add restricted profile - parent user must be "
1338                                    + "specified");
1339                            return null;
1340                        }
1341                        if (!parent.canHaveProfile()) {
1342                            Log.w(LOG_TAG, "Cannot add restricted profile - profiles cannot be "
1343                                    + "created for the specified parent user id " + parentId);
1344                            return null;
1345                        }
1346                    }
1347                    // In split system user mode, we assign the first human user the primary flag.
1348                    // And if there is no device owner, we also assign the admin flag to primary
1349                    // user.
1350                    if (UserManager.isSplitSystemUser()
1351                            && !isGuest && !isManagedProfile && getPrimaryUser() == null) {
1352                        flags |= UserInfo.FLAG_PRIMARY;
1353                        DevicePolicyManager devicePolicyManager = (DevicePolicyManager)
1354                                mContext.getSystemService(Context.DEVICE_POLICY_SERVICE);
1355                        if (devicePolicyManager == null
1356                                || devicePolicyManager.getDeviceOwner() == null) {
1357                            flags |= UserInfo.FLAG_ADMIN;
1358                        }
1359                    }
1360                    userId = getNextAvailableIdLocked();
1361                    userInfo = new UserInfo(userId, name, null, flags);
1362                    userInfo.serialNumber = mNextSerialNumber++;
1363                    long now = System.currentTimeMillis();
1364                    userInfo.creationTime = (now > EPOCH_PLUS_30_YEARS) ? now : 0;
1365                    userInfo.partial = true;
1366                    Environment.getUserSystemDirectory(userInfo.id).mkdirs();
1367                    mUsers.put(userId, userInfo);
1368                    writeUserListLocked();
1369                    if (parent != null) {
1370                        if (isManagedProfile) {
1371                            if (parent.profileGroupId == UserInfo.NO_PROFILE_GROUP_ID) {
1372                                parent.profileGroupId = parent.id;
1373                                scheduleWriteUserLocked(parent);
1374                            }
1375                            userInfo.profileGroupId = parent.profileGroupId;
1376                        } else if (isRestricted) {
1377                            if (!parent.canHaveProfile()) {
1378                                Log.w(LOG_TAG, "Cannot add restricted profile - parent user must be owner");
1379                            }
1380                            if (parent.restrictedProfileParentId == UserInfo.NO_PROFILE_GROUP_ID) {
1381                                parent.restrictedProfileParentId = parent.id;
1382                                scheduleWriteUserLocked(parent);
1383                            }
1384                            userInfo.restrictedProfileParentId = parent.restrictedProfileParentId;
1385                        }
1386                    }
1387                    final StorageManager storage = mContext.getSystemService(StorageManager.class);
1388                    for (VolumeInfo vol : storage.getWritablePrivateVolumes()) {
1389                        final String volumeUuid = vol.getFsUuid();
1390                        try {
1391                            final File userDir = Environment.getDataUserDirectory(volumeUuid,
1392                                    userId);
1393                            prepareUserDirectory(mContext, volumeUuid, userId);
1394                            enforceSerialNumber(userDir, userInfo.serialNumber);
1395                        } catch (IOException e) {
1396                            Log.wtf(LOG_TAG, "Failed to create user directory on " + volumeUuid, e);
1397                        }
1398                    }
1399                    mPm.createNewUserLILPw(userId);
1400                    userInfo.partial = false;
1401                    scheduleWriteUserLocked(userInfo);
1402                    updateUserIdsLocked();
1403                    Bundle restrictions = new Bundle();
1404                    mUserRestrictions.append(userId, restrictions);
1405                }
1406            }
1407            mPm.newUserCreated(userId);
1408            if (userInfo != null) {
1409                Intent addedIntent = new Intent(Intent.ACTION_USER_ADDED);
1410                addedIntent.putExtra(Intent.EXTRA_USER_HANDLE, userInfo.id);
1411                mContext.sendBroadcastAsUser(addedIntent, UserHandle.ALL,
1412                        android.Manifest.permission.MANAGE_USERS);
1413            }
1414        } finally {
1415            Binder.restoreCallingIdentity(ident);
1416        }
1417        return userInfo;
1418    }
1419
1420    /**
1421     * @hide
1422     */
1423    public UserInfo createRestrictedProfile(String name, int parentUserId) {
1424        checkManageUsersPermission("setupRestrictedProfile");
1425        final UserInfo user = createProfileForUser(name, UserInfo.FLAG_RESTRICTED, parentUserId);
1426        if (user == null) {
1427            return null;
1428        }
1429        setUserRestriction(UserManager.DISALLOW_MODIFY_ACCOUNTS, true, user.id);
1430        // Change the setting before applying the DISALLOW_SHARE_LOCATION restriction, otherwise
1431        // the putIntForUser() will fail.
1432        android.provider.Settings.Secure.putIntForUser(mContext.getContentResolver(),
1433                android.provider.Settings.Secure.LOCATION_MODE,
1434                android.provider.Settings.Secure.LOCATION_MODE_OFF, user.id);
1435        setUserRestriction(UserManager.DISALLOW_SHARE_LOCATION, true, user.id);
1436        return user;
1437    }
1438
1439    /**
1440     * Find the current guest user. If the Guest user is partial,
1441     * then do not include it in the results as it is about to die.
1442     */
1443    private UserInfo findCurrentGuestUserLocked() {
1444        final int size = mUsers.size();
1445        for (int i = 0; i < size; i++) {
1446            final UserInfo user = mUsers.valueAt(i);
1447            if (user.isGuest() && !user.guestToRemove && !mRemovingUserIds.get(user.id)) {
1448                return user;
1449            }
1450        }
1451        return null;
1452    }
1453
1454    /**
1455     * Mark this guest user for deletion to allow us to create another guest
1456     * and switch to that user before actually removing this guest.
1457     * @param userHandle the userid of the current guest
1458     * @return whether the user could be marked for deletion
1459     */
1460    public boolean markGuestForDeletion(int userHandle) {
1461        checkManageUsersPermission("Only the system can remove users");
1462        if (getUserRestrictions(UserHandle.getCallingUserId()).getBoolean(
1463                UserManager.DISALLOW_REMOVE_USER, false)) {
1464            Log.w(LOG_TAG, "Cannot remove user. DISALLOW_REMOVE_USER is enabled.");
1465            return false;
1466        }
1467
1468        long ident = Binder.clearCallingIdentity();
1469        try {
1470            final UserInfo user;
1471            synchronized (mPackagesLock) {
1472                user = mUsers.get(userHandle);
1473                if (userHandle == 0 || user == null || mRemovingUserIds.get(userHandle)) {
1474                    return false;
1475                }
1476                if (!user.isGuest()) {
1477                    return false;
1478                }
1479                // We set this to a guest user that is to be removed. This is a temporary state
1480                // where we are allowed to add new Guest users, even if this one is still not
1481                // removed. This user will still show up in getUserInfo() calls.
1482                // If we don't get around to removing this Guest user, it will be purged on next
1483                // startup.
1484                user.guestToRemove = true;
1485                // Mark it as disabled, so that it isn't returned any more when
1486                // profiles are queried.
1487                user.flags |= UserInfo.FLAG_DISABLED;
1488                writeUserLocked(user);
1489            }
1490        } finally {
1491            Binder.restoreCallingIdentity(ident);
1492        }
1493        return true;
1494    }
1495
1496    /**
1497     * Removes a user and all data directories created for that user. This method should be called
1498     * after the user's processes have been terminated.
1499     * @param userHandle the user's id
1500     */
1501    public boolean removeUser(int userHandle) {
1502        checkManageUsersPermission("Only the system can remove users");
1503        if (getUserRestrictions(UserHandle.getCallingUserId()).getBoolean(
1504                UserManager.DISALLOW_REMOVE_USER, false)) {
1505            Log.w(LOG_TAG, "Cannot remove user. DISALLOW_REMOVE_USER is enabled.");
1506            return false;
1507        }
1508
1509        long ident = Binder.clearCallingIdentity();
1510        try {
1511            final UserInfo user;
1512            synchronized (mPackagesLock) {
1513                user = mUsers.get(userHandle);
1514                if (userHandle == 0 || user == null || mRemovingUserIds.get(userHandle)) {
1515                    return false;
1516                }
1517
1518                // We remember deleted user IDs to prevent them from being
1519                // reused during the current boot; they can still be reused
1520                // after a reboot.
1521                mRemovingUserIds.put(userHandle, true);
1522
1523                try {
1524                    mAppOpsService.removeUser(userHandle);
1525                } catch (RemoteException e) {
1526                    Log.w(LOG_TAG, "Unable to notify AppOpsService of removing user", e);
1527                }
1528                // Set this to a partially created user, so that the user will be purged
1529                // on next startup, in case the runtime stops now before stopping and
1530                // removing the user completely.
1531                user.partial = true;
1532                // Mark it as disabled, so that it isn't returned any more when
1533                // profiles are queried.
1534                user.flags |= UserInfo.FLAG_DISABLED;
1535                writeUserLocked(user);
1536            }
1537
1538            if (user.profileGroupId != UserInfo.NO_PROFILE_GROUP_ID
1539                    && user.isManagedProfile()) {
1540                // Send broadcast to notify system that the user removed was a
1541                // managed user.
1542                sendProfileRemovedBroadcast(user.profileGroupId, user.id);
1543            }
1544
1545            if (DBG) Slog.i(LOG_TAG, "Stopping user " + userHandle);
1546            int res;
1547            try {
1548                res = ActivityManagerNative.getDefault().stopUser(userHandle,
1549                        new IStopUserCallback.Stub() {
1550                            @Override
1551                            public void userStopped(int userId) {
1552                                finishRemoveUser(userId);
1553                            }
1554                            @Override
1555                            public void userStopAborted(int userId) {
1556                            }
1557                        });
1558            } catch (RemoteException e) {
1559                return false;
1560            }
1561            return res == ActivityManager.USER_OP_SUCCESS;
1562        } finally {
1563            Binder.restoreCallingIdentity(ident);
1564        }
1565    }
1566
1567    void finishRemoveUser(final int userHandle) {
1568        if (DBG) Slog.i(LOG_TAG, "finishRemoveUser " + userHandle);
1569        // Let other services shutdown any activity and clean up their state before completely
1570        // wiping the user's system directory and removing from the user list
1571        long ident = Binder.clearCallingIdentity();
1572        try {
1573            Intent addedIntent = new Intent(Intent.ACTION_USER_REMOVED);
1574            addedIntent.putExtra(Intent.EXTRA_USER_HANDLE, userHandle);
1575            mContext.sendOrderedBroadcastAsUser(addedIntent, UserHandle.ALL,
1576                    android.Manifest.permission.MANAGE_USERS,
1577
1578                    new BroadcastReceiver() {
1579                        @Override
1580                        public void onReceive(Context context, Intent intent) {
1581                            if (DBG) {
1582                                Slog.i(LOG_TAG,
1583                                        "USER_REMOVED broadcast sent, cleaning up user data "
1584                                        + userHandle);
1585                            }
1586                            new Thread() {
1587                                public void run() {
1588                                    synchronized (mInstallLock) {
1589                                        synchronized (mPackagesLock) {
1590                                            removeUserStateLocked(userHandle);
1591                                        }
1592                                    }
1593                                }
1594                            }.start();
1595                        }
1596                    },
1597
1598                    null, Activity.RESULT_OK, null, null);
1599        } finally {
1600            Binder.restoreCallingIdentity(ident);
1601        }
1602    }
1603
1604    private void removeUserStateLocked(final int userHandle) {
1605        mContext.getSystemService(StorageManager.class)
1606            .deleteUserKey(userHandle);
1607        // Cleanup package manager settings
1608        mPm.cleanUpUserLILPw(this, userHandle);
1609
1610        // Remove this user from the list
1611        mUsers.remove(userHandle);
1612        // Remove user file
1613        AtomicFile userFile = new AtomicFile(new File(mUsersDir, userHandle + XML_SUFFIX));
1614        userFile.delete();
1615        // Update the user list
1616        writeUserListLocked();
1617        updateUserIdsLocked();
1618        removeDirectoryRecursive(Environment.getUserSystemDirectory(userHandle));
1619    }
1620
1621    private void removeDirectoryRecursive(File parent) {
1622        if (parent.isDirectory()) {
1623            String[] files = parent.list();
1624            for (String filename : files) {
1625                File child = new File(parent, filename);
1626                removeDirectoryRecursive(child);
1627            }
1628        }
1629        parent.delete();
1630    }
1631
1632    private void sendProfileRemovedBroadcast(int parentUserId, int removedUserId) {
1633        Intent managedProfileIntent = new Intent(Intent.ACTION_MANAGED_PROFILE_REMOVED);
1634        managedProfileIntent.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY |
1635                Intent.FLAG_RECEIVER_FOREGROUND);
1636        managedProfileIntent.putExtra(Intent.EXTRA_USER, new UserHandle(removedUserId));
1637        mContext.sendBroadcastAsUser(managedProfileIntent, new UserHandle(parentUserId), null);
1638    }
1639
1640    @Override
1641    public Bundle getApplicationRestrictions(String packageName) {
1642        return getApplicationRestrictionsForUser(packageName, UserHandle.getCallingUserId());
1643    }
1644
1645    @Override
1646    public Bundle getApplicationRestrictionsForUser(String packageName, int userId) {
1647        if (UserHandle.getCallingUserId() != userId
1648                || !UserHandle.isSameApp(Binder.getCallingUid(), getUidForPackage(packageName))) {
1649            checkManageUsersPermission("get application restrictions for other users/apps");
1650        }
1651        synchronized (mPackagesLock) {
1652            // Read the restrictions from XML
1653            return readApplicationRestrictionsLocked(packageName, userId);
1654        }
1655    }
1656
1657    @Override
1658    public void setApplicationRestrictions(String packageName, Bundle restrictions,
1659            int userId) {
1660        checkManageUsersPermission("set application restrictions");
1661        synchronized (mPackagesLock) {
1662            if (restrictions == null || restrictions.isEmpty()) {
1663                cleanAppRestrictionsForPackage(packageName, userId);
1664            } else {
1665                // Write the restrictions to XML
1666                writeApplicationRestrictionsLocked(packageName, restrictions, userId);
1667            }
1668        }
1669
1670        if (isPackageInstalled(packageName, userId)) {
1671            // Notify package of changes via an intent - only sent to explicitly registered receivers.
1672            Intent changeIntent = new Intent(Intent.ACTION_APPLICATION_RESTRICTIONS_CHANGED);
1673            changeIntent.setPackage(packageName);
1674            changeIntent.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY);
1675            mContext.sendBroadcastAsUser(changeIntent, new UserHandle(userId));
1676        }
1677    }
1678
1679    @Override
1680    public void removeRestrictions() {
1681        checkManageUsersPermission("remove restrictions");
1682        final int userHandle = UserHandle.getCallingUserId();
1683        removeRestrictionsForUser(userHandle, true);
1684    }
1685
1686    private void removeRestrictionsForUser(final int userHandle, boolean unhideApps) {
1687        synchronized (mPackagesLock) {
1688            // Remove all user restrictions
1689            setUserRestrictions(new Bundle(), userHandle);
1690            // Remove any app restrictions
1691            cleanAppRestrictions(userHandle);
1692        }
1693        if (unhideApps) {
1694            unhideAllInstalledAppsForUser(userHandle);
1695        }
1696    }
1697
1698    private void unhideAllInstalledAppsForUser(final int userHandle) {
1699        mHandler.post(new Runnable() {
1700            @Override
1701            public void run() {
1702                List<ApplicationInfo> apps =
1703                        mPm.getInstalledApplications(PackageManager.GET_UNINSTALLED_PACKAGES,
1704                                userHandle).getList();
1705                final long ident = Binder.clearCallingIdentity();
1706                try {
1707                    for (ApplicationInfo appInfo : apps) {
1708                        if ((appInfo.flags & ApplicationInfo.FLAG_INSTALLED) != 0
1709                                && (appInfo.privateFlags & ApplicationInfo.PRIVATE_FLAG_HIDDEN)
1710                                        != 0) {
1711                            mPm.setApplicationHiddenSettingAsUser(appInfo.packageName, false,
1712                                    userHandle);
1713                        }
1714                    }
1715                } finally {
1716                    Binder.restoreCallingIdentity(ident);
1717                }
1718            }
1719        });
1720    }
1721    private int getUidForPackage(String packageName) {
1722        long ident = Binder.clearCallingIdentity();
1723        try {
1724            return mContext.getPackageManager().getApplicationInfo(packageName,
1725                    PackageManager.GET_UNINSTALLED_PACKAGES).uid;
1726        } catch (NameNotFoundException nnfe) {
1727            return -1;
1728        } finally {
1729            Binder.restoreCallingIdentity(ident);
1730        }
1731    }
1732
1733    private Bundle readApplicationRestrictionsLocked(String packageName,
1734            int userId) {
1735        AtomicFile restrictionsFile =
1736                new AtomicFile(new File(Environment.getUserSystemDirectory(userId),
1737                        packageToRestrictionsFileName(packageName)));
1738        return readApplicationRestrictionsLocked(restrictionsFile);
1739    }
1740
1741    @VisibleForTesting
1742    static Bundle readApplicationRestrictionsLocked(AtomicFile restrictionsFile) {
1743        final Bundle restrictions = new Bundle();
1744        final ArrayList<String> values = new ArrayList<>();
1745        if (!restrictionsFile.getBaseFile().exists()) {
1746            return restrictions;
1747        }
1748
1749        FileInputStream fis = null;
1750        try {
1751            fis = restrictionsFile.openRead();
1752            XmlPullParser parser = Xml.newPullParser();
1753            parser.setInput(fis, StandardCharsets.UTF_8.name());
1754            XmlUtils.nextElement(parser);
1755            if (parser.getEventType() != XmlPullParser.START_TAG) {
1756                Slog.e(LOG_TAG, "Unable to read restrictions file "
1757                        + restrictionsFile.getBaseFile());
1758                return restrictions;
1759            }
1760            while (parser.next() != XmlPullParser.END_DOCUMENT) {
1761                readEntry(restrictions, values, parser);
1762            }
1763        } catch (IOException|XmlPullParserException e) {
1764            Log.w(LOG_TAG, "Error parsing " + restrictionsFile.getBaseFile(), e);
1765        } finally {
1766            IoUtils.closeQuietly(fis);
1767        }
1768        return restrictions;
1769    }
1770
1771    private static void readEntry(Bundle restrictions, ArrayList<String> values,
1772            XmlPullParser parser) throws XmlPullParserException, IOException {
1773        int type = parser.getEventType();
1774        if (type == XmlPullParser.START_TAG && parser.getName().equals(TAG_ENTRY)) {
1775            String key = parser.getAttributeValue(null, ATTR_KEY);
1776            String valType = parser.getAttributeValue(null, ATTR_VALUE_TYPE);
1777            String multiple = parser.getAttributeValue(null, ATTR_MULTIPLE);
1778            if (multiple != null) {
1779                values.clear();
1780                int count = Integer.parseInt(multiple);
1781                while (count > 0 && (type = parser.next()) != XmlPullParser.END_DOCUMENT) {
1782                    if (type == XmlPullParser.START_TAG
1783                            && parser.getName().equals(TAG_VALUE)) {
1784                        values.add(parser.nextText().trim());
1785                        count--;
1786                    }
1787                }
1788                String [] valueStrings = new String[values.size()];
1789                values.toArray(valueStrings);
1790                restrictions.putStringArray(key, valueStrings);
1791            } else if (ATTR_TYPE_BUNDLE.equals(valType)) {
1792                restrictions.putBundle(key, readBundleEntry(parser, values));
1793            } else if (ATTR_TYPE_BUNDLE_ARRAY.equals(valType)) {
1794                final int outerDepth = parser.getDepth();
1795                ArrayList<Bundle> bundleList = new ArrayList<>();
1796                while (XmlUtils.nextElementWithin(parser, outerDepth)) {
1797                    Bundle childBundle = readBundleEntry(parser, values);
1798                    bundleList.add(childBundle);
1799                }
1800                restrictions.putParcelableArray(key,
1801                        bundleList.toArray(new Bundle[bundleList.size()]));
1802            } else {
1803                String value = parser.nextText().trim();
1804                if (ATTR_TYPE_BOOLEAN.equals(valType)) {
1805                    restrictions.putBoolean(key, Boolean.parseBoolean(value));
1806                } else if (ATTR_TYPE_INTEGER.equals(valType)) {
1807                    restrictions.putInt(key, Integer.parseInt(value));
1808                } else {
1809                    restrictions.putString(key, value);
1810                }
1811            }
1812        }
1813    }
1814
1815    private static Bundle readBundleEntry(XmlPullParser parser, ArrayList<String> values)
1816            throws IOException, XmlPullParserException {
1817        Bundle childBundle = new Bundle();
1818        final int outerDepth = parser.getDepth();
1819        while (XmlUtils.nextElementWithin(parser, outerDepth)) {
1820            readEntry(childBundle, values, parser);
1821        }
1822        return childBundle;
1823    }
1824
1825    private void writeApplicationRestrictionsLocked(String packageName,
1826            Bundle restrictions, int userId) {
1827        AtomicFile restrictionsFile = new AtomicFile(
1828                new File(Environment.getUserSystemDirectory(userId),
1829                        packageToRestrictionsFileName(packageName)));
1830        writeApplicationRestrictionsLocked(restrictions, restrictionsFile);
1831    }
1832
1833    @VisibleForTesting
1834    static void writeApplicationRestrictionsLocked(Bundle restrictions,
1835            AtomicFile restrictionsFile) {
1836        FileOutputStream fos = null;
1837        try {
1838            fos = restrictionsFile.startWrite();
1839            final BufferedOutputStream bos = new BufferedOutputStream(fos);
1840
1841            final XmlSerializer serializer = new FastXmlSerializer();
1842            serializer.setOutput(bos, StandardCharsets.UTF_8.name());
1843            serializer.startDocument(null, true);
1844            serializer.setFeature("http://xmlpull.org/v1/doc/features.html#indent-output", true);
1845
1846            serializer.startTag(null, TAG_RESTRICTIONS);
1847            writeBundle(restrictions, serializer);
1848            serializer.endTag(null, TAG_RESTRICTIONS);
1849
1850            serializer.endDocument();
1851            restrictionsFile.finishWrite(fos);
1852        } catch (Exception e) {
1853            restrictionsFile.failWrite(fos);
1854            Slog.e(LOG_TAG, "Error writing application restrictions list", e);
1855        }
1856    }
1857
1858    private static void writeBundle(Bundle restrictions, XmlSerializer serializer)
1859            throws IOException {
1860        for (String key : restrictions.keySet()) {
1861            Object value = restrictions.get(key);
1862            serializer.startTag(null, TAG_ENTRY);
1863            serializer.attribute(null, ATTR_KEY, key);
1864
1865            if (value instanceof Boolean) {
1866                serializer.attribute(null, ATTR_VALUE_TYPE, ATTR_TYPE_BOOLEAN);
1867                serializer.text(value.toString());
1868            } else if (value instanceof Integer) {
1869                serializer.attribute(null, ATTR_VALUE_TYPE, ATTR_TYPE_INTEGER);
1870                serializer.text(value.toString());
1871            } else if (value == null || value instanceof String) {
1872                serializer.attribute(null, ATTR_VALUE_TYPE, ATTR_TYPE_STRING);
1873                serializer.text(value != null ? (String) value : "");
1874            } else if (value instanceof Bundle) {
1875                serializer.attribute(null, ATTR_VALUE_TYPE, ATTR_TYPE_BUNDLE);
1876                writeBundle((Bundle) value, serializer);
1877            } else if (value instanceof Parcelable[]) {
1878                serializer.attribute(null, ATTR_VALUE_TYPE, ATTR_TYPE_BUNDLE_ARRAY);
1879                Parcelable[] array = (Parcelable[]) value;
1880                for (Parcelable parcelable : array) {
1881                    if (!(parcelable instanceof Bundle)) {
1882                        throw new IllegalArgumentException("bundle-array can only hold Bundles");
1883                    }
1884                    serializer.startTag(null, TAG_ENTRY);
1885                    serializer.attribute(null, ATTR_VALUE_TYPE, ATTR_TYPE_BUNDLE);
1886                    writeBundle((Bundle) parcelable, serializer);
1887                    serializer.endTag(null, TAG_ENTRY);
1888                }
1889            } else {
1890                serializer.attribute(null, ATTR_VALUE_TYPE, ATTR_TYPE_STRING_ARRAY);
1891                String[] values = (String[]) value;
1892                serializer.attribute(null, ATTR_MULTIPLE, Integer.toString(values.length));
1893                for (String choice : values) {
1894                    serializer.startTag(null, TAG_VALUE);
1895                    serializer.text(choice != null ? choice : "");
1896                    serializer.endTag(null, TAG_VALUE);
1897                }
1898            }
1899            serializer.endTag(null, TAG_ENTRY);
1900        }
1901    }
1902
1903    @Override
1904    public int getUserSerialNumber(int userHandle) {
1905        synchronized (mPackagesLock) {
1906            if (!exists(userHandle)) return -1;
1907            return getUserInfoLocked(userHandle).serialNumber;
1908        }
1909    }
1910
1911    @Override
1912    public int getUserHandle(int userSerialNumber) {
1913        synchronized (mPackagesLock) {
1914            for (int userId : mUserIds) {
1915                UserInfo info = getUserInfoLocked(userId);
1916                if (info != null && info.serialNumber == userSerialNumber) return userId;
1917            }
1918            // Not found
1919            return -1;
1920        }
1921    }
1922
1923    @Override
1924    public long getUserCreationTime(int userHandle) {
1925        int callingUserId = UserHandle.getCallingUserId();
1926        UserInfo userInfo = null;
1927        synchronized (mPackagesLock) {
1928            if (callingUserId == userHandle) {
1929                userInfo = getUserInfoLocked(userHandle);
1930            } else {
1931                UserInfo parent = getProfileParentLocked(userHandle);
1932                if (parent != null && parent.id == callingUserId) {
1933                    userInfo = getUserInfoLocked(userHandle);
1934                }
1935            }
1936        }
1937        if (userInfo == null) {
1938            throw new SecurityException("userHandle can only be the calling user or a managed "
1939                    + "profile associated with this user");
1940        }
1941        return userInfo.creationTime;
1942    }
1943
1944    /**
1945     * Caches the list of user ids in an array, adjusting the array size when necessary.
1946     */
1947    private void updateUserIdsLocked() {
1948        int num = 0;
1949        for (int i = 0; i < mUsers.size(); i++) {
1950            if (!mUsers.valueAt(i).partial) {
1951                num++;
1952            }
1953        }
1954        final int[] newUsers = new int[num];
1955        int n = 0;
1956        for (int i = 0; i < mUsers.size(); i++) {
1957            if (!mUsers.valueAt(i).partial) {
1958                newUsers[n++] = mUsers.keyAt(i);
1959            }
1960        }
1961        mUserIds = newUsers;
1962    }
1963
1964    /**
1965     * Make a note of the last started time of a user and do some cleanup.
1966     * @param userId the user that was just foregrounded
1967     */
1968    public void onUserForeground(int userId) {
1969        synchronized (mPackagesLock) {
1970            UserInfo user = mUsers.get(userId);
1971            long now = System.currentTimeMillis();
1972            if (user == null || user.partial) {
1973                Slog.w(LOG_TAG, "userForeground: unknown user #" + userId);
1974                return;
1975            }
1976            if (now > EPOCH_PLUS_30_YEARS) {
1977                user.lastLoggedInTime = now;
1978                scheduleWriteUserLocked(user);
1979            }
1980        }
1981    }
1982
1983    /**
1984     * Returns the next available user id, filling in any holes in the ids.
1985     * TODO: May not be a good idea to recycle ids, in case it results in confusion
1986     * for data and battery stats collection, or unexpected cross-talk.
1987     * @return
1988     */
1989    private int getNextAvailableIdLocked() {
1990        synchronized (mPackagesLock) {
1991            int i = MIN_USER_ID;
1992            while (i < Integer.MAX_VALUE) {
1993                if (mUsers.indexOfKey(i) < 0 && !mRemovingUserIds.get(i)) {
1994                    break;
1995                }
1996                i++;
1997            }
1998            return i;
1999        }
2000    }
2001
2002    private String packageToRestrictionsFileName(String packageName) {
2003        return RESTRICTIONS_FILE_PREFIX + packageName + XML_SUFFIX;
2004    }
2005
2006    /**
2007     * Create new {@code /data/user/[id]} directory and sets default
2008     * permissions.
2009     */
2010    public static void prepareUserDirectory(Context context, String volumeUuid, int userId) {
2011        final StorageManager storage = context.getSystemService(StorageManager.class);
2012        final File userDir = Environment.getDataUserDirectory(volumeUuid, userId);
2013        storage.createNewUserDir(userId, userDir);
2014    }
2015
2016    /**
2017     * Enforce that serial number stored in user directory inode matches the
2018     * given expected value. Gracefully sets the serial number if currently
2019     * undefined.
2020     *
2021     * @throws IOException when problem extracting serial number, or serial
2022     *             number is mismatched.
2023     */
2024    public static void enforceSerialNumber(File file, int serialNumber) throws IOException {
2025        final int foundSerial = getSerialNumber(file);
2026        Slog.v(LOG_TAG, "Found " + file + " with serial number " + foundSerial);
2027
2028        if (foundSerial == -1) {
2029            Slog.d(LOG_TAG, "Serial number missing on " + file + "; assuming current is valid");
2030            try {
2031                setSerialNumber(file, serialNumber);
2032            } catch (IOException e) {
2033                Slog.w(LOG_TAG, "Failed to set serial number on " + file, e);
2034            }
2035
2036        } else if (foundSerial != serialNumber) {
2037            throw new IOException("Found serial number " + foundSerial
2038                    + " doesn't match expected " + serialNumber);
2039        }
2040    }
2041
2042    /**
2043     * Set serial number stored in user directory inode.
2044     *
2045     * @throws IOException if serial number was already set
2046     */
2047    private static void setSerialNumber(File file, int serialNumber)
2048            throws IOException {
2049        try {
2050            final byte[] buf = Integer.toString(serialNumber).getBytes(StandardCharsets.UTF_8);
2051            Os.setxattr(file.getAbsolutePath(), XATTR_SERIAL, buf, OsConstants.XATTR_CREATE);
2052        } catch (ErrnoException e) {
2053            throw e.rethrowAsIOException();
2054        }
2055    }
2056
2057    /**
2058     * Return serial number stored in user directory inode.
2059     *
2060     * @return parsed serial number, or -1 if not set
2061     */
2062    private static int getSerialNumber(File file) throws IOException {
2063        try {
2064            final byte[] buf = new byte[256];
2065            final int len = Os.getxattr(file.getAbsolutePath(), XATTR_SERIAL, buf);
2066            final String serial = new String(buf, 0, len);
2067            try {
2068                return Integer.parseInt(serial);
2069            } catch (NumberFormatException e) {
2070                throw new IOException("Bad serial number: " + serial);
2071            }
2072        } catch (ErrnoException e) {
2073            if (e.errno == OsConstants.ENODATA) {
2074                return -1;
2075            } else {
2076                throw e.rethrowAsIOException();
2077            }
2078        }
2079    }
2080
2081    @Override
2082    protected void dump(FileDescriptor fd, PrintWriter pw, String[] args) {
2083        if (mContext.checkCallingOrSelfPermission(android.Manifest.permission.DUMP)
2084                != PackageManager.PERMISSION_GRANTED) {
2085            pw.println("Permission Denial: can't dump UserManager from from pid="
2086                    + Binder.getCallingPid()
2087                    + ", uid=" + Binder.getCallingUid()
2088                    + " without permission "
2089                    + android.Manifest.permission.DUMP);
2090            return;
2091        }
2092
2093        long now = System.currentTimeMillis();
2094        StringBuilder sb = new StringBuilder();
2095        synchronized (mPackagesLock) {
2096            pw.println("Users:");
2097            for (int i = 0; i < mUsers.size(); i++) {
2098                UserInfo user = mUsers.valueAt(i);
2099                if (user == null) continue;
2100                pw.print("  "); pw.print(user); pw.print(" serialNo="); pw.print(user.serialNumber);
2101                if (mRemovingUserIds.get(mUsers.keyAt(i))) pw.print(" <removing> ");
2102                if (user.partial) pw.print(" <partial>");
2103                pw.println();
2104                pw.print("    Created: ");
2105                if (user.creationTime == 0) {
2106                    pw.println("<unknown>");
2107                } else {
2108                    sb.setLength(0);
2109                    TimeUtils.formatDuration(now - user.creationTime, sb);
2110                    sb.append(" ago");
2111                    pw.println(sb);
2112                }
2113                pw.print("    Last logged in: ");
2114                if (user.lastLoggedInTime == 0) {
2115                    pw.println("<unknown>");
2116                } else {
2117                    sb.setLength(0);
2118                    TimeUtils.formatDuration(now - user.lastLoggedInTime, sb);
2119                    sb.append(" ago");
2120                    pw.println(sb);
2121                }
2122            }
2123        }
2124    }
2125
2126    final class MainHandler extends Handler {
2127
2128        @Override
2129        public void handleMessage(Message msg) {
2130            switch (msg.what) {
2131                case WRITE_USER_MSG:
2132                    removeMessages(WRITE_USER_MSG, msg.obj);
2133                    synchronized (mPackagesLock) {
2134                        int userId = ((UserInfo) msg.obj).id;
2135                        UserInfo userInfo = mUsers.get(userId);
2136                        if (userInfo != null) {
2137                            writeUserLocked(userInfo);
2138                        }
2139                    }
2140            }
2141        }
2142    }
2143
2144    /**
2145     * @param userId
2146     * @return whether the user has been initialized yet
2147     */
2148    boolean isInitialized(int userId) {
2149        return (getUserInfo(userId).flags & UserInfo.FLAG_INITIALIZED) != 0;
2150    }
2151}
2152