UserManagerService.java revision 385124d8cee38dee00d4fac31e8fbe46fb30565b
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 static android.text.format.DateUtils.MINUTE_IN_MILLIS; 20 21import android.app.Activity; 22import android.app.ActivityManager; 23import android.app.ActivityManagerNative; 24import android.app.ActivityThread; 25import android.app.admin.DevicePolicyManager; 26import android.app.IStopUserCallback; 27import android.app.admin.DevicePolicyManager; 28import android.content.BroadcastReceiver; 29import android.content.Context; 30import android.content.Intent; 31import android.content.pm.ApplicationInfo; 32import android.content.pm.PackageManager; 33import android.content.pm.PackageManager.NameNotFoundException; 34import android.content.pm.UserInfo; 35import android.graphics.Bitmap; 36import android.graphics.BitmapFactory; 37import android.os.Binder; 38import android.os.Bundle; 39import android.os.Environment; 40import android.os.FileUtils; 41import android.os.Handler; 42import android.os.IUserManager; 43import android.os.Process; 44import android.os.RemoteException; 45import android.os.UserHandle; 46import android.os.UserManager; 47import android.util.AtomicFile; 48import android.util.Log; 49import android.util.Slog; 50import android.util.SparseArray; 51import android.util.SparseBooleanArray; 52import android.util.TimeUtils; 53import android.util.Xml; 54 55import com.android.internal.content.PackageMonitor; 56import com.android.internal.util.ArrayUtils; 57import com.android.internal.util.FastXmlSerializer; 58 59import org.xmlpull.v1.XmlPullParser; 60import org.xmlpull.v1.XmlPullParserException; 61import org.xmlpull.v1.XmlSerializer; 62 63import java.io.BufferedOutputStream; 64import java.io.File; 65import java.io.FileDescriptor; 66import java.io.FileInputStream; 67import java.io.FileNotFoundException; 68import java.io.FileOutputStream; 69import java.io.IOException; 70import java.io.PrintWriter; 71import java.security.MessageDigest; 72import java.security.NoSuchAlgorithmException; 73import java.security.SecureRandom; 74import java.util.ArrayList; 75import java.util.List; 76 77public class UserManagerService extends IUserManager.Stub { 78 79 private static final String LOG_TAG = "UserManagerService"; 80 81 private static final boolean DBG = false; 82 83 private static final String TAG_NAME = "name"; 84 private static final String ATTR_FLAGS = "flags"; 85 private static final String ATTR_ICON_PATH = "icon"; 86 private static final String ATTR_ID = "id"; 87 private static final String ATTR_CREATION_TIME = "created"; 88 private static final String ATTR_LAST_LOGGED_IN_TIME = "lastLoggedIn"; 89 private static final String ATTR_SALT = "salt"; 90 private static final String ATTR_PIN_HASH = "pinHash"; 91 private static final String ATTR_FAILED_ATTEMPTS = "failedAttempts"; 92 private static final String ATTR_LAST_RETRY_MS = "lastAttemptMs"; 93 private static final String ATTR_SERIAL_NO = "serialNumber"; 94 private static final String ATTR_NEXT_SERIAL_NO = "nextSerialNumber"; 95 private static final String ATTR_PARTIAL = "partial"; 96 private static final String ATTR_USER_VERSION = "version"; 97 private static final String ATTR_PROFILE_GROUP_ID = "profileGroupId"; 98 private static final String TAG_USERS = "users"; 99 private static final String TAG_USER = "user"; 100 private static final String TAG_RESTRICTIONS = "restrictions"; 101 private static final String TAG_ENTRY = "entry"; 102 private static final String TAG_VALUE = "value"; 103 private static final String ATTR_KEY = "key"; 104 private static final String ATTR_VALUE_TYPE = "type"; 105 private static final String ATTR_MULTIPLE = "m"; 106 107 private static final String ATTR_TYPE_STRING_ARRAY = "sa"; 108 private static final String ATTR_TYPE_STRING = "s"; 109 private static final String ATTR_TYPE_BOOLEAN = "b"; 110 111 private static final String USER_INFO_DIR = "system" + File.separator + "users"; 112 private static final String USER_LIST_FILENAME = "userlist.xml"; 113 private static final String USER_PHOTO_FILENAME = "photo.png"; 114 115 private static final String RESTRICTIONS_FILE_PREFIX = "res_"; 116 private static final String XML_SUFFIX = ".xml"; 117 118 private static final int MIN_USER_ID = 10; 119 120 private static final int USER_VERSION = 4; 121 122 private static final long EPOCH_PLUS_30_YEARS = 30L * 365 * 24 * 60 * 60 * 1000L; // ms 123 124 // Number of attempts before jumping to the next BACKOFF_TIMES slot 125 private static final int BACKOFF_INC_INTERVAL = 5; 126 127 // Amount of time to force the user to wait before entering the PIN again, after failing 128 // BACKOFF_INC_INTERVAL times. 129 private static final int[] BACKOFF_TIMES = { 0, 30*1000, 60*1000, 5*60*1000, 30*60*1000 }; 130 131 private final Context mContext; 132 private final PackageManagerService mPm; 133 private final Object mInstallLock; 134 private final Object mPackagesLock; 135 136 private final Handler mHandler; 137 138 private final File mUsersDir; 139 private final File mUserListFile; 140 private final File mBaseUserPath; 141 142 private final SparseArray<UserInfo> mUsers = new SparseArray<UserInfo>(); 143 private final SparseArray<Bundle> mUserRestrictions = new SparseArray<Bundle>(); 144 145 class RestrictionsPinState { 146 long salt; 147 String pinHash; 148 int failedAttempts; 149 long lastAttemptTime; 150 } 151 152 private final SparseArray<RestrictionsPinState> mRestrictionsPinStates = 153 new SparseArray<RestrictionsPinState>(); 154 155 /** 156 * Set of user IDs being actively removed. Removed IDs linger in this set 157 * for several seconds to work around a VFS caching issue. 158 */ 159 // @GuardedBy("mPackagesLock") 160 private final SparseBooleanArray mRemovingUserIds = new SparseBooleanArray(); 161 162 private int[] mUserIds; 163 private boolean mGuestEnabled; 164 private int mNextSerialNumber; 165 private int mUserVersion = 0; 166 167 private static UserManagerService sInstance; 168 169 public static UserManagerService getInstance() { 170 synchronized (UserManagerService.class) { 171 return sInstance; 172 } 173 } 174 175 /** 176 * Available for testing purposes. 177 */ 178 UserManagerService(File dataDir, File baseUserPath) { 179 this(null, null, new Object(), new Object(), dataDir, baseUserPath); 180 } 181 182 /** 183 * Called by package manager to create the service. This is closely 184 * associated with the package manager, and the given lock is the 185 * package manager's own lock. 186 */ 187 UserManagerService(Context context, PackageManagerService pm, 188 Object installLock, Object packagesLock) { 189 this(context, pm, installLock, packagesLock, 190 Environment.getDataDirectory(), 191 new File(Environment.getDataDirectory(), "user")); 192 } 193 194 /** 195 * Available for testing purposes. 196 */ 197 private UserManagerService(Context context, PackageManagerService pm, 198 Object installLock, Object packagesLock, 199 File dataDir, File baseUserPath) { 200 mContext = context; 201 mPm = pm; 202 mInstallLock = installLock; 203 mPackagesLock = packagesLock; 204 mHandler = new Handler(); 205 synchronized (mInstallLock) { 206 synchronized (mPackagesLock) { 207 mUsersDir = new File(dataDir, USER_INFO_DIR); 208 mUsersDir.mkdirs(); 209 // Make zeroth user directory, for services to migrate their files to that location 210 File userZeroDir = new File(mUsersDir, "0"); 211 userZeroDir.mkdirs(); 212 mBaseUserPath = baseUserPath; 213 FileUtils.setPermissions(mUsersDir.toString(), 214 FileUtils.S_IRWXU|FileUtils.S_IRWXG 215 |FileUtils.S_IROTH|FileUtils.S_IXOTH, 216 -1, -1); 217 mUserListFile = new File(mUsersDir, USER_LIST_FILENAME); 218 readUserListLocked(); 219 // Prune out any partially created/partially removed users. 220 ArrayList<UserInfo> partials = new ArrayList<UserInfo>(); 221 for (int i = 0; i < mUsers.size(); i++) { 222 UserInfo ui = mUsers.valueAt(i); 223 if (ui.partial && i != 0) { 224 partials.add(ui); 225 } 226 } 227 for (int i = 0; i < partials.size(); i++) { 228 UserInfo ui = partials.get(i); 229 Slog.w(LOG_TAG, "Removing partially created user #" + i 230 + " (name=" + ui.name + ")"); 231 removeUserStateLocked(ui.id); 232 } 233 sInstance = this; 234 } 235 } 236 } 237 238 void systemReady() { 239 mUserPackageMonitor.register(mContext, null, UserHandle.ALL, false); 240 userForeground(UserHandle.USER_OWNER); 241 } 242 243 @Override 244 public List<UserInfo> getUsers(boolean excludeDying) { 245 checkManageUsersPermission("query users"); 246 synchronized (mPackagesLock) { 247 ArrayList<UserInfo> users = new ArrayList<UserInfo>(mUsers.size()); 248 for (int i = 0; i < mUsers.size(); i++) { 249 UserInfo ui = mUsers.valueAt(i); 250 if (ui.partial) { 251 continue; 252 } 253 if (!excludeDying || !mRemovingUserIds.get(ui.id)) { 254 users.add(ui); 255 } 256 } 257 return users; 258 } 259 } 260 261 @Override 262 public List<UserInfo> getProfiles(int userId, boolean enabledOnly) { 263 if (userId != UserHandle.getCallingUserId()) { 264 checkManageUsersPermission("getting profiles related to user " + userId); 265 } 266 synchronized (mPackagesLock) { 267 // Getting the service here is not good for testing purposes. However, this service 268 // is not available when UserManagerService starts up so we need a lazy load. 269 270 DevicePolicyManager dpm = null; 271 if (enabledOnly) { 272 dpm = (DevicePolicyManager) 273 mContext.getSystemService(Context.DEVICE_POLICY_SERVICE); 274 } 275 276 UserInfo user = getUserInfoLocked(userId); 277 ArrayList<UserInfo> users = new ArrayList<UserInfo>(mUsers.size()); 278 for (int i = 0; i < mUsers.size(); i++) { 279 UserInfo profile = mUsers.valueAt(i); 280 if (!isProfileOf(user, profile)) { 281 continue; 282 } 283 284 if (enabledOnly && profile.isManagedProfile()) { 285 if (dpm != null) { 286 if(!dpm.isProfileEnabled(profile.id)) { 287 continue; 288 } 289 } else { 290 Log.w(LOG_TAG, 291 "Attempting to reach DevicePolicyManager before it was started"); 292 // TODO: There might be system apps that need to call this. Make sure that 293 // DevicePolicyManagerService is ready at that time (otherwise, any default 294 // value is a bad one). 295 throw new IllegalArgumentException(String.format( 296 "Attempting to get enabled profiles for %d before " 297 + "DevicePolicyManagerService has been started.", userId)); 298 } 299 } 300 users.add(profile); 301 } 302 return users; 303 } 304 } 305 306 private boolean isProfileOf(UserInfo user, UserInfo profile) { 307 return user.id == profile.id || 308 (user.profileGroupId != UserInfo.NO_PROFILE_GROUP_ID 309 && user.profileGroupId == profile.profileGroupId); 310 } 311 312 @Override 313 public UserInfo getUserInfo(int userId) { 314 checkManageUsersPermission("query user"); 315 synchronized (mPackagesLock) { 316 return getUserInfoLocked(userId); 317 } 318 } 319 320 @Override 321 public boolean isRestricted() { 322 synchronized (mPackagesLock) { 323 return getUserInfoLocked(UserHandle.getCallingUserId()).isRestricted(); 324 } 325 } 326 327 /* 328 * Should be locked on mUsers before calling this. 329 */ 330 private UserInfo getUserInfoLocked(int userId) { 331 UserInfo ui = mUsers.get(userId); 332 // If it is partial and not in the process of being removed, return as unknown user. 333 if (ui != null && ui.partial && !mRemovingUserIds.get(userId)) { 334 Slog.w(LOG_TAG, "getUserInfo: unknown user #" + userId); 335 return null; 336 } 337 return ui; 338 } 339 340 public boolean exists(int userId) { 341 synchronized (mPackagesLock) { 342 return ArrayUtils.contains(mUserIds, userId); 343 } 344 } 345 346 @Override 347 public void setUserName(int userId, String name) { 348 checkManageUsersPermission("rename users"); 349 boolean changed = false; 350 synchronized (mPackagesLock) { 351 UserInfo info = mUsers.get(userId); 352 if (info == null || info.partial) { 353 Slog.w(LOG_TAG, "setUserName: unknown user #" + userId); 354 return; 355 } 356 if (name != null && !name.equals(info.name)) { 357 info.name = name; 358 writeUserLocked(info); 359 changed = true; 360 } 361 } 362 if (changed) { 363 sendUserInfoChangedBroadcast(userId); 364 } 365 } 366 367 @Override 368 public void setUserIcon(int userId, Bitmap bitmap) { 369 checkManageUsersPermission("update users"); 370 synchronized (mPackagesLock) { 371 UserInfo info = mUsers.get(userId); 372 if (info == null || info.partial) { 373 Slog.w(LOG_TAG, "setUserIcon: unknown user #" + userId); 374 return; 375 } 376 writeBitmapLocked(info, bitmap); 377 writeUserLocked(info); 378 } 379 sendUserInfoChangedBroadcast(userId); 380 } 381 382 private void sendUserInfoChangedBroadcast(int userId) { 383 Intent changedIntent = new Intent(Intent.ACTION_USER_INFO_CHANGED); 384 changedIntent.putExtra(Intent.EXTRA_USER_HANDLE, userId); 385 changedIntent.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY); 386 mContext.sendBroadcastAsUser(changedIntent, UserHandle.ALL); 387 } 388 389 @Override 390 public Bitmap getUserIcon(int userId) { 391 checkManageUsersPermission("read users"); 392 synchronized (mPackagesLock) { 393 UserInfo info = mUsers.get(userId); 394 if (info == null || info.partial) { 395 Slog.w(LOG_TAG, "getUserIcon: unknown user #" + userId); 396 return null; 397 } 398 if (info.iconPath == null) { 399 return null; 400 } 401 return BitmapFactory.decodeFile(info.iconPath); 402 } 403 } 404 405 @Override 406 public void setGuestEnabled(boolean enable) { 407 checkManageUsersPermission("enable guest users"); 408 synchronized (mPackagesLock) { 409 if (mGuestEnabled != enable) { 410 mGuestEnabled = enable; 411 // Erase any guest user that currently exists 412 for (int i = 0; i < mUsers.size(); i++) { 413 UserInfo user = mUsers.valueAt(i); 414 if (!user.partial && user.isGuest()) { 415 if (!enable) { 416 removeUser(user.id); 417 } 418 return; 419 } 420 } 421 // No guest was found 422 if (enable) { 423 createUser("Guest", UserInfo.FLAG_GUEST); 424 } 425 } 426 } 427 } 428 429 @Override 430 public boolean isGuestEnabled() { 431 synchronized (mPackagesLock) { 432 return mGuestEnabled; 433 } 434 } 435 436 @Override 437 public void wipeUser(int userHandle) { 438 checkManageUsersPermission("wipe user"); 439 // TODO: 440 } 441 442 public void makeInitialized(int userId) { 443 checkManageUsersPermission("makeInitialized"); 444 synchronized (mPackagesLock) { 445 UserInfo info = mUsers.get(userId); 446 if (info == null || info.partial) { 447 Slog.w(LOG_TAG, "makeInitialized: unknown user #" + userId); 448 } 449 if ((info.flags&UserInfo.FLAG_INITIALIZED) == 0) { 450 info.flags |= UserInfo.FLAG_INITIALIZED; 451 writeUserLocked(info); 452 } 453 } 454 } 455 456 @Override 457 public Bundle getUserRestrictions(int userId) { 458 // checkManageUsersPermission("getUserRestrictions"); 459 460 synchronized (mPackagesLock) { 461 Bundle restrictions = mUserRestrictions.get(userId); 462 return restrictions != null ? restrictions : Bundle.EMPTY; 463 } 464 } 465 466 @Override 467 public void setUserRestrictions(Bundle restrictions, int userId) { 468 checkProfileOwnerOrManageUsersPermission("setUserRestrictions"); 469 if (restrictions == null) return; 470 471 synchronized (mPackagesLock) { 472 mUserRestrictions.get(userId).clear(); 473 mUserRestrictions.get(userId).putAll(restrictions); 474 writeUserLocked(mUsers.get(userId)); 475 } 476 } 477 478 /** 479 * Check if we've hit the limit of how many users can be created. 480 */ 481 private boolean isUserLimitReachedLocked() { 482 int nUsers = mUsers.size(); 483 return nUsers >= UserManager.getMaxSupportedUsers(); 484 } 485 486 /** 487 * Enforces that only the system UID or root's UID or apps that have the 488 * {@link android.Manifest.permission#MANAGE_USERS MANAGE_USERS} 489 * permission can make certain calls to the UserManager. 490 * 491 * @param message used as message if SecurityException is thrown 492 * @throws SecurityException if the caller is not system or root 493 */ 494 private final void checkManageUsersPermission(String message) { 495 final int uid = Binder.getCallingUid(); 496 497 if (missingManageUsersPermission(uid)) { 498 throw new SecurityException("You need MANAGE_USERS permission to: " + message); 499 } 500 } 501 502 /** 503 * Enforces that only the system UID, root's UID, apps that have the 504 * {@link android.Manifest.permission#MANAGE_USERS MANAGE_USERS} 505 * permission, the profile owner, or the device owner can make certain calls to the 506 * UserManager. 507 * 508 * @param message used as message if SecurityException is thrown 509 * @throws SecurityException if the caller is not system, root, or device 510 * owner 511 */ 512 private final void checkProfileOwnerOrManageUsersPermission(String message) { 513 final int uid = Binder.getCallingUid(); 514 boolean isProfileOwner = false; 515 if (mContext != null && mContext.getPackageManager() != null) { 516 String[] pkgs = mContext.getPackageManager().getPackagesForUid(uid); 517 DevicePolicyManager dpm = 518 (DevicePolicyManager) mContext.getSystemService(Context.DEVICE_POLICY_SERVICE); 519 if (dpm != null) { 520 for (String pkg : pkgs) { 521 if (dpm.isDeviceOwnerApp(pkg) || dpm.isProfileOwnerApp(pkg)) { 522 isProfileOwner = true; 523 } 524 } 525 } 526 } 527 528 if (missingManageUsersPermission(uid) && !isProfileOwner) { 529 throw new SecurityException( 530 "You need MANAGE_USERS permission or device owner privileges to: " + message); 531 } 532 } 533 534 private boolean missingManageUsersPermission(int uid) { 535 return uid != Process.SYSTEM_UID && uid != 0 536 && ActivityManager.checkComponentPermission( 537 android.Manifest.permission.MANAGE_USERS, 538 uid, -1, true) != PackageManager.PERMISSION_GRANTED; 539 } 540 541 private void writeBitmapLocked(UserInfo info, Bitmap bitmap) { 542 try { 543 File dir = new File(mUsersDir, Integer.toString(info.id)); 544 File file = new File(dir, USER_PHOTO_FILENAME); 545 if (!dir.exists()) { 546 dir.mkdir(); 547 FileUtils.setPermissions( 548 dir.getPath(), 549 FileUtils.S_IRWXU|FileUtils.S_IRWXG|FileUtils.S_IXOTH, 550 -1, -1); 551 } 552 FileOutputStream os; 553 if (bitmap.compress(Bitmap.CompressFormat.PNG, 100, os = new FileOutputStream(file))) { 554 info.iconPath = file.getAbsolutePath(); 555 } 556 try { 557 os.close(); 558 } catch (IOException ioe) { 559 // What the ... ! 560 } 561 } catch (FileNotFoundException e) { 562 Slog.w(LOG_TAG, "Error setting photo for user ", e); 563 } 564 } 565 566 /** 567 * Returns an array of user ids. This array is cached here for quick access, so do not modify or 568 * cache it elsewhere. 569 * @return the array of user ids. 570 */ 571 public int[] getUserIds() { 572 synchronized (mPackagesLock) { 573 return mUserIds; 574 } 575 } 576 577 int[] getUserIdsLPr() { 578 return mUserIds; 579 } 580 581 private void readUserListLocked() { 582 mGuestEnabled = false; 583 if (!mUserListFile.exists()) { 584 fallbackToSingleUserLocked(); 585 return; 586 } 587 FileInputStream fis = null; 588 AtomicFile userListFile = new AtomicFile(mUserListFile); 589 try { 590 fis = userListFile.openRead(); 591 XmlPullParser parser = Xml.newPullParser(); 592 parser.setInput(fis, null); 593 int type; 594 while ((type = parser.next()) != XmlPullParser.START_TAG 595 && type != XmlPullParser.END_DOCUMENT) { 596 ; 597 } 598 599 if (type != XmlPullParser.START_TAG) { 600 Slog.e(LOG_TAG, "Unable to read user list"); 601 fallbackToSingleUserLocked(); 602 return; 603 } 604 605 mNextSerialNumber = -1; 606 if (parser.getName().equals(TAG_USERS)) { 607 String lastSerialNumber = parser.getAttributeValue(null, ATTR_NEXT_SERIAL_NO); 608 if (lastSerialNumber != null) { 609 mNextSerialNumber = Integer.parseInt(lastSerialNumber); 610 } 611 String versionNumber = parser.getAttributeValue(null, ATTR_USER_VERSION); 612 if (versionNumber != null) { 613 mUserVersion = Integer.parseInt(versionNumber); 614 } 615 } 616 617 while ((type = parser.next()) != XmlPullParser.END_DOCUMENT) { 618 if (type == XmlPullParser.START_TAG && parser.getName().equals(TAG_USER)) { 619 String id = parser.getAttributeValue(null, ATTR_ID); 620 UserInfo user = readUserLocked(Integer.parseInt(id)); 621 622 if (user != null) { 623 mUsers.put(user.id, user); 624 if (user.isGuest()) { 625 mGuestEnabled = true; 626 } 627 if (mNextSerialNumber < 0 || mNextSerialNumber <= user.id) { 628 mNextSerialNumber = user.id + 1; 629 } 630 } 631 } 632 } 633 updateUserIdsLocked(); 634 upgradeIfNecessaryLocked(); 635 } catch (IOException ioe) { 636 fallbackToSingleUserLocked(); 637 } catch (XmlPullParserException pe) { 638 fallbackToSingleUserLocked(); 639 } finally { 640 if (fis != null) { 641 try { 642 fis.close(); 643 } catch (IOException e) { 644 } 645 } 646 } 647 } 648 649 /** 650 * Upgrade steps between versions, either for fixing bugs or changing the data format. 651 */ 652 private void upgradeIfNecessaryLocked() { 653 int userVersion = mUserVersion; 654 if (userVersion < 1) { 655 // Assign a proper name for the owner, if not initialized correctly before 656 UserInfo user = mUsers.get(UserHandle.USER_OWNER); 657 if ("Primary".equals(user.name)) { 658 user.name = mContext.getResources().getString(com.android.internal.R.string.owner_name); 659 writeUserLocked(user); 660 } 661 userVersion = 1; 662 } 663 664 if (userVersion < 2) { 665 // Owner should be marked as initialized 666 UserInfo user = mUsers.get(UserHandle.USER_OWNER); 667 if ((user.flags & UserInfo.FLAG_INITIALIZED) == 0) { 668 user.flags |= UserInfo.FLAG_INITIALIZED; 669 writeUserLocked(user); 670 } 671 userVersion = 2; 672 } 673 674 675 if (userVersion < 4) { 676 userVersion = 4; 677 } 678 679 if (userVersion < USER_VERSION) { 680 Slog.w(LOG_TAG, "User version " + mUserVersion + " didn't upgrade as expected to " 681 + USER_VERSION); 682 } else { 683 mUserVersion = userVersion; 684 writeUserListLocked(); 685 } 686 } 687 688 private void fallbackToSingleUserLocked() { 689 // Create the primary user 690 UserInfo primary = new UserInfo(UserHandle.USER_OWNER, 691 mContext.getResources().getString(com.android.internal.R.string.owner_name), null, 692 UserInfo.FLAG_ADMIN | UserInfo.FLAG_PRIMARY | UserInfo.FLAG_INITIALIZED); 693 mUsers.put(0, primary); 694 mNextSerialNumber = MIN_USER_ID; 695 mUserVersion = USER_VERSION; 696 697 Bundle restrictions = new Bundle(); 698 mUserRestrictions.append(UserHandle.USER_OWNER, restrictions); 699 700 updateUserIdsLocked(); 701 702 writeUserListLocked(); 703 writeUserLocked(primary); 704 } 705 706 /* 707 * Writes the user file in this format: 708 * 709 * <user flags="20039023" id="0"> 710 * <name>Primary</name> 711 * </user> 712 */ 713 private void writeUserLocked(UserInfo userInfo) { 714 FileOutputStream fos = null; 715 AtomicFile userFile = new AtomicFile(new File(mUsersDir, userInfo.id + XML_SUFFIX)); 716 try { 717 fos = userFile.startWrite(); 718 final BufferedOutputStream bos = new BufferedOutputStream(fos); 719 720 // XmlSerializer serializer = XmlUtils.serializerInstance(); 721 final XmlSerializer serializer = new FastXmlSerializer(); 722 serializer.setOutput(bos, "utf-8"); 723 serializer.startDocument(null, true); 724 serializer.setFeature("http://xmlpull.org/v1/doc/features.html#indent-output", true); 725 726 serializer.startTag(null, TAG_USER); 727 serializer.attribute(null, ATTR_ID, Integer.toString(userInfo.id)); 728 serializer.attribute(null, ATTR_SERIAL_NO, Integer.toString(userInfo.serialNumber)); 729 serializer.attribute(null, ATTR_FLAGS, Integer.toString(userInfo.flags)); 730 serializer.attribute(null, ATTR_CREATION_TIME, Long.toString(userInfo.creationTime)); 731 serializer.attribute(null, ATTR_LAST_LOGGED_IN_TIME, 732 Long.toString(userInfo.lastLoggedInTime)); 733 RestrictionsPinState pinState = mRestrictionsPinStates.get(userInfo.id); 734 if (pinState != null) { 735 if (pinState.salt != 0) { 736 serializer.attribute(null, ATTR_SALT, Long.toString(pinState.salt)); 737 } 738 if (pinState.pinHash != null) { 739 serializer.attribute(null, ATTR_PIN_HASH, pinState.pinHash); 740 } 741 if (pinState.failedAttempts != 0) { 742 serializer.attribute(null, ATTR_FAILED_ATTEMPTS, 743 Integer.toString(pinState.failedAttempts)); 744 serializer.attribute(null, ATTR_LAST_RETRY_MS, 745 Long.toString(pinState.lastAttemptTime)); 746 } 747 } 748 if (userInfo.iconPath != null) { 749 serializer.attribute(null, ATTR_ICON_PATH, userInfo.iconPath); 750 } 751 if (userInfo.partial) { 752 serializer.attribute(null, ATTR_PARTIAL, "true"); 753 } 754 if (userInfo.profileGroupId != UserInfo.NO_PROFILE_GROUP_ID) { 755 serializer.attribute(null, ATTR_PROFILE_GROUP_ID, 756 Integer.toString(userInfo.profileGroupId)); 757 } 758 759 serializer.startTag(null, TAG_NAME); 760 serializer.text(userInfo.name); 761 serializer.endTag(null, TAG_NAME); 762 763 Bundle restrictions = mUserRestrictions.get(userInfo.id); 764 if (restrictions != null) { 765 serializer.startTag(null, TAG_RESTRICTIONS); 766 writeBoolean(serializer, restrictions, UserManager.DISALLOW_CONFIG_WIFI); 767 writeBoolean(serializer, restrictions, UserManager.DISALLOW_MODIFY_ACCOUNTS); 768 writeBoolean(serializer, restrictions, UserManager.DISALLOW_INSTALL_APPS); 769 writeBoolean(serializer, restrictions, UserManager.DISALLOW_UNINSTALL_APPS); 770 writeBoolean(serializer, restrictions, UserManager.DISALLOW_SHARE_LOCATION); 771 writeBoolean(serializer, restrictions, 772 UserManager.DISALLOW_INSTALL_UNKNOWN_SOURCES); 773 writeBoolean(serializer, restrictions, UserManager.DISALLOW_CONFIG_BLUETOOTH); 774 writeBoolean(serializer, restrictions, UserManager.DISALLOW_USB_FILE_TRANSFER); 775 writeBoolean(serializer, restrictions, UserManager.DISALLOW_CONFIG_CREDENTIALS); 776 writeBoolean(serializer, restrictions, UserManager.DISALLOW_REMOVE_USER); 777 serializer.endTag(null, TAG_RESTRICTIONS); 778 } 779 serializer.endTag(null, TAG_USER); 780 781 serializer.endDocument(); 782 userFile.finishWrite(fos); 783 } catch (Exception ioe) { 784 Slog.e(LOG_TAG, "Error writing user info " + userInfo.id + "\n" + ioe); 785 userFile.failWrite(fos); 786 } 787 } 788 789 /* 790 * Writes the user list file in this format: 791 * 792 * <users nextSerialNumber="3"> 793 * <user id="0"></user> 794 * <user id="2"></user> 795 * </users> 796 */ 797 private void writeUserListLocked() { 798 FileOutputStream fos = null; 799 AtomicFile userListFile = new AtomicFile(mUserListFile); 800 try { 801 fos = userListFile.startWrite(); 802 final BufferedOutputStream bos = new BufferedOutputStream(fos); 803 804 // XmlSerializer serializer = XmlUtils.serializerInstance(); 805 final XmlSerializer serializer = new FastXmlSerializer(); 806 serializer.setOutput(bos, "utf-8"); 807 serializer.startDocument(null, true); 808 serializer.setFeature("http://xmlpull.org/v1/doc/features.html#indent-output", true); 809 810 serializer.startTag(null, TAG_USERS); 811 serializer.attribute(null, ATTR_NEXT_SERIAL_NO, Integer.toString(mNextSerialNumber)); 812 serializer.attribute(null, ATTR_USER_VERSION, Integer.toString(mUserVersion)); 813 814 for (int i = 0; i < mUsers.size(); i++) { 815 UserInfo user = mUsers.valueAt(i); 816 serializer.startTag(null, TAG_USER); 817 serializer.attribute(null, ATTR_ID, Integer.toString(user.id)); 818 serializer.endTag(null, TAG_USER); 819 } 820 821 serializer.endTag(null, TAG_USERS); 822 823 serializer.endDocument(); 824 userListFile.finishWrite(fos); 825 } catch (Exception e) { 826 userListFile.failWrite(fos); 827 Slog.e(LOG_TAG, "Error writing user list"); 828 } 829 } 830 831 private UserInfo readUserLocked(int id) { 832 int flags = 0; 833 int serialNumber = id; 834 String name = null; 835 String iconPath = null; 836 long creationTime = 0L; 837 long lastLoggedInTime = 0L; 838 long salt = 0L; 839 String pinHash = null; 840 int failedAttempts = 0; 841 int profileGroupId = UserInfo.NO_PROFILE_GROUP_ID; 842 long lastAttemptTime = 0L; 843 boolean partial = false; 844 Bundle restrictions = new Bundle(); 845 846 FileInputStream fis = null; 847 try { 848 AtomicFile userFile = 849 new AtomicFile(new File(mUsersDir, Integer.toString(id) + XML_SUFFIX)); 850 fis = userFile.openRead(); 851 XmlPullParser parser = Xml.newPullParser(); 852 parser.setInput(fis, null); 853 int type; 854 while ((type = parser.next()) != XmlPullParser.START_TAG 855 && type != XmlPullParser.END_DOCUMENT) { 856 ; 857 } 858 859 if (type != XmlPullParser.START_TAG) { 860 Slog.e(LOG_TAG, "Unable to read user " + id); 861 return null; 862 } 863 864 if (type == XmlPullParser.START_TAG && parser.getName().equals(TAG_USER)) { 865 int storedId = readIntAttribute(parser, ATTR_ID, -1); 866 if (storedId != id) { 867 Slog.e(LOG_TAG, "User id does not match the file name"); 868 return null; 869 } 870 serialNumber = readIntAttribute(parser, ATTR_SERIAL_NO, id); 871 flags = readIntAttribute(parser, ATTR_FLAGS, 0); 872 iconPath = parser.getAttributeValue(null, ATTR_ICON_PATH); 873 creationTime = readLongAttribute(parser, ATTR_CREATION_TIME, 0); 874 lastLoggedInTime = readLongAttribute(parser, ATTR_LAST_LOGGED_IN_TIME, 0); 875 salt = readLongAttribute(parser, ATTR_SALT, 0L); 876 pinHash = parser.getAttributeValue(null, ATTR_PIN_HASH); 877 failedAttempts = readIntAttribute(parser, ATTR_FAILED_ATTEMPTS, 0); 878 lastAttemptTime = readLongAttribute(parser, ATTR_LAST_RETRY_MS, 0L); 879 profileGroupId = readIntAttribute(parser, ATTR_PROFILE_GROUP_ID, 880 UserInfo.NO_PROFILE_GROUP_ID); 881 if (profileGroupId == UserInfo.NO_PROFILE_GROUP_ID) { 882 // This attribute was added and renamed during development of L. 883 // TODO Remove upgrade path by 1st May 2014 884 profileGroupId = readIntAttribute(parser, "relatedGroupId", 885 UserInfo.NO_PROFILE_GROUP_ID); 886 } 887 String valueString = parser.getAttributeValue(null, ATTR_PARTIAL); 888 if ("true".equals(valueString)) { 889 partial = true; 890 } 891 892 int outerDepth = parser.getDepth(); 893 while ((type = parser.next()) != XmlPullParser.END_DOCUMENT 894 && (type != XmlPullParser.END_TAG || parser.getDepth() > outerDepth)) { 895 if (type == XmlPullParser.END_TAG || type == XmlPullParser.TEXT) { 896 continue; 897 } 898 String tag = parser.getName(); 899 if (TAG_NAME.equals(tag)) { 900 type = parser.next(); 901 if (type == XmlPullParser.TEXT) { 902 name = parser.getText(); 903 } 904 } else if (TAG_RESTRICTIONS.equals(tag)) { 905 readBoolean(parser, restrictions, UserManager.DISALLOW_CONFIG_WIFI); 906 readBoolean(parser, restrictions, UserManager.DISALLOW_MODIFY_ACCOUNTS); 907 readBoolean(parser, restrictions, UserManager.DISALLOW_INSTALL_APPS); 908 readBoolean(parser, restrictions, UserManager.DISALLOW_UNINSTALL_APPS); 909 readBoolean(parser, restrictions, UserManager.DISALLOW_SHARE_LOCATION); 910 readBoolean(parser, restrictions, 911 UserManager.DISALLOW_INSTALL_UNKNOWN_SOURCES); 912 readBoolean(parser, restrictions, UserManager.DISALLOW_CONFIG_BLUETOOTH); 913 readBoolean(parser, restrictions, UserManager.DISALLOW_USB_FILE_TRANSFER); 914 readBoolean(parser, restrictions, UserManager.DISALLOW_CONFIG_CREDENTIALS); 915 readBoolean(parser, restrictions, UserManager.DISALLOW_REMOVE_USER); 916 } 917 } 918 } 919 920 UserInfo userInfo = new UserInfo(id, name, iconPath, flags); 921 userInfo.serialNumber = serialNumber; 922 userInfo.creationTime = creationTime; 923 userInfo.lastLoggedInTime = lastLoggedInTime; 924 userInfo.partial = partial; 925 userInfo.profileGroupId = profileGroupId; 926 mUserRestrictions.append(id, restrictions); 927 if (salt != 0L) { 928 RestrictionsPinState pinState = mRestrictionsPinStates.get(id); 929 if (pinState == null) { 930 pinState = new RestrictionsPinState(); 931 mRestrictionsPinStates.put(id, pinState); 932 } 933 pinState.salt = salt; 934 pinState.pinHash = pinHash; 935 pinState.failedAttempts = failedAttempts; 936 pinState.lastAttemptTime = lastAttemptTime; 937 } 938 return userInfo; 939 940 } catch (IOException ioe) { 941 } catch (XmlPullParserException pe) { 942 } finally { 943 if (fis != null) { 944 try { 945 fis.close(); 946 } catch (IOException e) { 947 } 948 } 949 } 950 return null; 951 } 952 953 private void readBoolean(XmlPullParser parser, Bundle restrictions, 954 String restrictionKey) { 955 String value = parser.getAttributeValue(null, restrictionKey); 956 if (value != null) { 957 restrictions.putBoolean(restrictionKey, Boolean.parseBoolean(value)); 958 } 959 } 960 961 private void writeBoolean(XmlSerializer xml, Bundle restrictions, String restrictionKey) 962 throws IOException { 963 if (restrictions.containsKey(restrictionKey)) { 964 xml.attribute(null, restrictionKey, 965 Boolean.toString(restrictions.getBoolean(restrictionKey))); 966 } 967 } 968 969 private int readIntAttribute(XmlPullParser parser, String attr, int defaultValue) { 970 String valueString = parser.getAttributeValue(null, attr); 971 if (valueString == null) return defaultValue; 972 try { 973 return Integer.parseInt(valueString); 974 } catch (NumberFormatException nfe) { 975 return defaultValue; 976 } 977 } 978 979 private long readLongAttribute(XmlPullParser parser, String attr, long defaultValue) { 980 String valueString = parser.getAttributeValue(null, attr); 981 if (valueString == null) return defaultValue; 982 try { 983 return Long.parseLong(valueString); 984 } catch (NumberFormatException nfe) { 985 return defaultValue; 986 } 987 } 988 989 private boolean isPackageInstalled(String pkg, int userId) { 990 final ApplicationInfo info = mPm.getApplicationInfo(pkg, 991 PackageManager.GET_UNINSTALLED_PACKAGES, 992 userId); 993 if (info == null || (info.flags&ApplicationInfo.FLAG_INSTALLED) == 0) { 994 return false; 995 } 996 return true; 997 } 998 999 /** 1000 * Removes all the restrictions files (res_<packagename>) for a given user, if all is true, 1001 * else removes only those packages that have been uninstalled. 1002 * Does not do any permissions checking. 1003 */ 1004 private void cleanAppRestrictions(int userId, boolean all) { 1005 synchronized (mPackagesLock) { 1006 File dir = Environment.getUserSystemDirectory(userId); 1007 String[] files = dir.list(); 1008 if (files == null) return; 1009 for (String fileName : files) { 1010 if (fileName.startsWith(RESTRICTIONS_FILE_PREFIX)) { 1011 File resFile = new File(dir, fileName); 1012 if (resFile.exists()) { 1013 if (all) { 1014 resFile.delete(); 1015 } else { 1016 String pkg = restrictionsFileNameToPackage(fileName); 1017 if (!isPackageInstalled(pkg, userId)) { 1018 resFile.delete(); 1019 } 1020 } 1021 } 1022 } 1023 } 1024 } 1025 } 1026 1027 /** 1028 * Removes the app restrictions file for a specific package and user id, if it exists. 1029 */ 1030 private void cleanAppRestrictionsForPackage(String pkg, int userId) { 1031 synchronized (mPackagesLock) { 1032 File dir = Environment.getUserSystemDirectory(userId); 1033 File resFile = new File(dir, packageToRestrictionsFileName(pkg)); 1034 if (resFile.exists()) { 1035 resFile.delete(); 1036 } 1037 } 1038 } 1039 1040 private int getNextProfileGroupIdLocked() { 1041 int maxGroupId = UserInfo.NO_PROFILE_GROUP_ID; 1042 for (int i = 0; i < mUsers.size(); i++) { 1043 UserInfo ui = mUsers.valueAt(i); 1044 if (maxGroupId < ui.profileGroupId) { 1045 maxGroupId = ui.profileGroupId; 1046 } 1047 } 1048 return maxGroupId + 1; 1049 } 1050 1051 @Override 1052 public UserInfo createProfileForUser(String name, int flags, int userId) { 1053 checkManageUsersPermission("Only the system can create users"); 1054 if (userId != UserHandle.USER_OWNER) { 1055 Slog.w(LOG_TAG, "Only user owner can have profiles"); 1056 return null; 1057 } 1058 return createUserInternal(name, flags, userId); 1059 } 1060 1061 @Override 1062 public UserInfo createUser(String name, int flags) { 1063 checkManageUsersPermission("Only the system can create users"); 1064 return createUserInternal(name, flags, UserHandle.USER_NULL); 1065 } 1066 1067 private UserInfo createUserInternal(String name, int flags, int profileId) { 1068 final long ident = Binder.clearCallingIdentity(); 1069 UserInfo userInfo = null; 1070 try { 1071 synchronized (mInstallLock) { 1072 synchronized (mPackagesLock) { 1073 UserInfo profile = null; 1074 if (profileId != UserHandle.USER_NULL) { 1075 profile = getUserInfoLocked(profileId); 1076 if (profile == null) return null; 1077 } 1078 if (isUserLimitReachedLocked()) return null; 1079 int userId = getNextAvailableIdLocked(); 1080 userInfo = new UserInfo(userId, name, null, flags); 1081 File userPath = new File(mBaseUserPath, Integer.toString(userId)); 1082 userInfo.serialNumber = mNextSerialNumber++; 1083 long now = System.currentTimeMillis(); 1084 userInfo.creationTime = (now > EPOCH_PLUS_30_YEARS) ? now : 0; 1085 userInfo.partial = true; 1086 Environment.getUserSystemDirectory(userInfo.id).mkdirs(); 1087 mUsers.put(userId, userInfo); 1088 writeUserListLocked(); 1089 if (profile != null) { 1090 if (profile.profileGroupId == UserInfo.NO_PROFILE_GROUP_ID) { 1091 profile.profileGroupId = getNextProfileGroupIdLocked(); 1092 writeUserLocked(profile); 1093 } 1094 userInfo.profileGroupId = profile.profileGroupId; 1095 } 1096 writeUserLocked(userInfo); 1097 mPm.createNewUserLILPw(userId, userPath); 1098 userInfo.partial = false; 1099 writeUserLocked(userInfo); 1100 updateUserIdsLocked(); 1101 Bundle restrictions = new Bundle(); 1102 mUserRestrictions.append(userId, restrictions); 1103 } 1104 } 1105 if (userInfo != null) { 1106 Intent addedIntent = new Intent(Intent.ACTION_USER_ADDED); 1107 addedIntent.putExtra(Intent.EXTRA_USER_HANDLE, userInfo.id); 1108 mContext.sendBroadcastAsUser(addedIntent, UserHandle.ALL, 1109 android.Manifest.permission.MANAGE_USERS); 1110 } 1111 } finally { 1112 Binder.restoreCallingIdentity(ident); 1113 } 1114 return userInfo; 1115 } 1116 1117 /** 1118 * Removes a user and all data directories created for that user. This method should be called 1119 * after the user's processes have been terminated. 1120 * @param userHandle the user's id 1121 */ 1122 public boolean removeUser(int userHandle) { 1123 checkManageUsersPermission("Only the system can remove users"); 1124 final UserInfo user; 1125 synchronized (mPackagesLock) { 1126 user = mUsers.get(userHandle); 1127 if (userHandle == 0 || user == null) { 1128 return false; 1129 } 1130 mRemovingUserIds.put(userHandle, true); 1131 // Set this to a partially created user, so that the user will be purged 1132 // on next startup, in case the runtime stops now before stopping and 1133 // removing the user completely. 1134 user.partial = true; 1135 writeUserLocked(user); 1136 } 1137 if (DBG) Slog.i(LOG_TAG, "Stopping user " + userHandle); 1138 int res; 1139 try { 1140 res = ActivityManagerNative.getDefault().stopUser(userHandle, 1141 new IStopUserCallback.Stub() { 1142 @Override 1143 public void userStopped(int userId) { 1144 finishRemoveUser(userId); 1145 } 1146 @Override 1147 public void userStopAborted(int userId) { 1148 } 1149 }); 1150 } catch (RemoteException e) { 1151 return false; 1152 } 1153 1154 return res == ActivityManager.USER_OP_SUCCESS; 1155 } 1156 1157 void finishRemoveUser(final int userHandle) { 1158 if (DBG) Slog.i(LOG_TAG, "finishRemoveUser " + userHandle); 1159 // Let other services shutdown any activity and clean up their state before completely 1160 // wiping the user's system directory and removing from the user list 1161 long ident = Binder.clearCallingIdentity(); 1162 try { 1163 Intent addedIntent = new Intent(Intent.ACTION_USER_REMOVED); 1164 addedIntent.putExtra(Intent.EXTRA_USER_HANDLE, userHandle); 1165 mContext.sendOrderedBroadcastAsUser(addedIntent, UserHandle.ALL, 1166 android.Manifest.permission.MANAGE_USERS, 1167 1168 new BroadcastReceiver() { 1169 @Override 1170 public void onReceive(Context context, Intent intent) { 1171 if (DBG) { 1172 Slog.i(LOG_TAG, 1173 "USER_REMOVED broadcast sent, cleaning up user data " 1174 + userHandle); 1175 } 1176 new Thread() { 1177 public void run() { 1178 synchronized (mInstallLock) { 1179 synchronized (mPackagesLock) { 1180 removeUserStateLocked(userHandle); 1181 } 1182 } 1183 } 1184 }.start(); 1185 } 1186 }, 1187 1188 null, Activity.RESULT_OK, null, null); 1189 } finally { 1190 Binder.restoreCallingIdentity(ident); 1191 } 1192 } 1193 1194 private void removeUserStateLocked(final int userHandle) { 1195 // Cleanup package manager settings 1196 mPm.cleanUpUserLILPw(userHandle); 1197 1198 // Remove this user from the list 1199 mUsers.remove(userHandle); 1200 1201 // Have user ID linger for several seconds to let external storage VFS 1202 // cache entries expire. This must be greater than the 'entry_valid' 1203 // timeout used by the FUSE daemon. 1204 mHandler.postDelayed(new Runnable() { 1205 @Override 1206 public void run() { 1207 synchronized (mPackagesLock) { 1208 mRemovingUserIds.delete(userHandle); 1209 } 1210 } 1211 }, MINUTE_IN_MILLIS); 1212 1213 mRestrictionsPinStates.remove(userHandle); 1214 // Remove user file 1215 AtomicFile userFile = new AtomicFile(new File(mUsersDir, userHandle + XML_SUFFIX)); 1216 userFile.delete(); 1217 // Update the user list 1218 writeUserListLocked(); 1219 updateUserIdsLocked(); 1220 removeDirectoryRecursive(Environment.getUserSystemDirectory(userHandle)); 1221 } 1222 1223 private void removeDirectoryRecursive(File parent) { 1224 if (parent.isDirectory()) { 1225 String[] files = parent.list(); 1226 for (String filename : files) { 1227 File child = new File(parent, filename); 1228 removeDirectoryRecursive(child); 1229 } 1230 } 1231 parent.delete(); 1232 } 1233 1234 @Override 1235 public Bundle getApplicationRestrictions(String packageName) { 1236 return getApplicationRestrictionsForUser(packageName, UserHandle.getCallingUserId()); 1237 } 1238 1239 @Override 1240 public Bundle getApplicationRestrictionsForUser(String packageName, int userId) { 1241 if (UserHandle.getCallingUserId() != userId 1242 || !UserHandle.isSameApp(Binder.getCallingUid(), getUidForPackage(packageName))) { 1243 checkProfileOwnerOrManageUsersPermission( 1244 "Only system or device owner can get restrictions for other users/apps"); 1245 } 1246 synchronized (mPackagesLock) { 1247 // Read the restrictions from XML 1248 return readApplicationRestrictionsLocked(packageName, userId); 1249 } 1250 } 1251 1252 @Override 1253 public void setApplicationRestrictions(String packageName, Bundle restrictions, 1254 int userId) { 1255 if (UserHandle.getCallingUserId() != userId 1256 || !UserHandle.isSameApp(Binder.getCallingUid(), getUidForPackage(packageName))) { 1257 checkProfileOwnerOrManageUsersPermission( 1258 "Only system or device owner can set restrictions for other users/apps"); 1259 } 1260 synchronized (mPackagesLock) { 1261 // Write the restrictions to XML 1262 writeApplicationRestrictionsLocked(packageName, restrictions, userId); 1263 } 1264 1265 // Notify package of changes via an intent - only sent to explicitly registered receivers. 1266 Intent changeIntent = new Intent(Intent.ACTION_APPLICATION_RESTRICTIONS_CHANGED); 1267 changeIntent.setPackage(packageName); 1268 changeIntent.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY); 1269 mContext.sendBroadcastAsUser(changeIntent, new UserHandle(userId)); 1270 } 1271 1272 @Override 1273 public boolean setRestrictionsChallenge(String newPin) { 1274 checkManageUsersPermission("Only system can modify the restrictions pin"); 1275 int userId = UserHandle.getCallingUserId(); 1276 synchronized (mPackagesLock) { 1277 RestrictionsPinState pinState = mRestrictionsPinStates.get(userId); 1278 if (pinState == null) { 1279 pinState = new RestrictionsPinState(); 1280 } 1281 if (newPin == null) { 1282 pinState.salt = 0; 1283 pinState.pinHash = null; 1284 } else { 1285 try { 1286 pinState.salt = SecureRandom.getInstance("SHA1PRNG").nextLong(); 1287 } catch (NoSuchAlgorithmException e) { 1288 pinState.salt = (long) (Math.random() * Long.MAX_VALUE); 1289 } 1290 pinState.pinHash = passwordToHash(newPin, pinState.salt); 1291 pinState.failedAttempts = 0; 1292 } 1293 mRestrictionsPinStates.put(userId, pinState); 1294 writeUserLocked(mUsers.get(userId)); 1295 } 1296 return true; 1297 } 1298 1299 @Override 1300 public int checkRestrictionsChallenge(String pin) { 1301 checkManageUsersPermission("Only system can verify the restrictions pin"); 1302 int userId = UserHandle.getCallingUserId(); 1303 synchronized (mPackagesLock) { 1304 RestrictionsPinState pinState = mRestrictionsPinStates.get(userId); 1305 // If there's no pin set, return error code 1306 if (pinState == null || pinState.salt == 0 || pinState.pinHash == null) { 1307 return UserManager.PIN_VERIFICATION_FAILED_NOT_SET; 1308 } else if (pin == null) { 1309 // If just checking if user can be prompted, return remaining time 1310 int waitTime = getRemainingTimeForPinAttempt(pinState); 1311 Slog.d(LOG_TAG, "Remaining waittime peek=" + waitTime); 1312 return waitTime; 1313 } else { 1314 int waitTime = getRemainingTimeForPinAttempt(pinState); 1315 Slog.d(LOG_TAG, "Remaining waittime=" + waitTime); 1316 if (waitTime > 0) { 1317 return waitTime; 1318 } 1319 if (passwordToHash(pin, pinState.salt).equals(pinState.pinHash)) { 1320 pinState.failedAttempts = 0; 1321 writeUserLocked(mUsers.get(userId)); 1322 return UserManager.PIN_VERIFICATION_SUCCESS; 1323 } else { 1324 pinState.failedAttempts++; 1325 pinState.lastAttemptTime = System.currentTimeMillis(); 1326 writeUserLocked(mUsers.get(userId)); 1327 return waitTime; 1328 } 1329 } 1330 } 1331 } 1332 1333 private int getRemainingTimeForPinAttempt(RestrictionsPinState pinState) { 1334 int backoffIndex = Math.min(pinState.failedAttempts / BACKOFF_INC_INTERVAL, 1335 BACKOFF_TIMES.length - 1); 1336 int backoffTime = (pinState.failedAttempts % BACKOFF_INC_INTERVAL) == 0 ? 1337 BACKOFF_TIMES[backoffIndex] : 0; 1338 return (int) Math.max(backoffTime + pinState.lastAttemptTime - System.currentTimeMillis(), 1339 0); 1340 } 1341 1342 @Override 1343 public boolean hasRestrictionsChallenge() { 1344 int userId = UserHandle.getCallingUserId(); 1345 synchronized (mPackagesLock) { 1346 return hasRestrictionsPinLocked(userId); 1347 } 1348 } 1349 1350 private boolean hasRestrictionsPinLocked(int userId) { 1351 RestrictionsPinState pinState = mRestrictionsPinStates.get(userId); 1352 if (pinState == null || pinState.salt == 0 || pinState.pinHash == null) { 1353 return false; 1354 } 1355 return true; 1356 } 1357 1358 @Override 1359 public void removeRestrictions() { 1360 checkProfileOwnerOrManageUsersPermission( 1361 "Only system or device owner can remove restrictions"); 1362 final int userHandle = UserHandle.getCallingUserId(); 1363 removeRestrictionsForUser(userHandle, true); 1364 } 1365 1366 private void removeRestrictionsForUser(final int userHandle, boolean unblockApps) { 1367 synchronized (mPackagesLock) { 1368 // Remove all user restrictions 1369 setUserRestrictions(new Bundle(), userHandle); 1370 // Remove restrictions pin 1371 setRestrictionsChallenge(null); 1372 // Remove any app restrictions 1373 cleanAppRestrictions(userHandle, true); 1374 } 1375 if (unblockApps) { 1376 unblockAllAppsForUser(userHandle); 1377 } 1378 } 1379 1380 private void unblockAllAppsForUser(final int userHandle) { 1381 mHandler.post(new Runnable() { 1382 @Override 1383 public void run() { 1384 List<ApplicationInfo> apps = 1385 mPm.getInstalledApplications(PackageManager.GET_UNINSTALLED_PACKAGES, 1386 userHandle).getList(); 1387 final long ident = Binder.clearCallingIdentity(); 1388 try { 1389 for (ApplicationInfo appInfo : apps) { 1390 if ((appInfo.flags & ApplicationInfo.FLAG_INSTALLED) != 0 1391 && (appInfo.flags & ApplicationInfo.FLAG_BLOCKED) != 0) { 1392 mPm.setApplicationBlockedSettingAsUser(appInfo.packageName, false, 1393 userHandle); 1394 } 1395 } 1396 } finally { 1397 Binder.restoreCallingIdentity(ident); 1398 } 1399 } 1400 }); 1401 } 1402 1403 /* 1404 * Generate a hash for the given password. To avoid brute force attacks, we use a salted hash. 1405 * Not the most secure, but it is at least a second level of protection. First level is that 1406 * the file is in a location only readable by the system process. 1407 * @param password the password. 1408 * @param salt the randomly generated salt 1409 * @return the hash of the pattern in a String. 1410 */ 1411 private String passwordToHash(String password, long salt) { 1412 if (password == null) { 1413 return null; 1414 } 1415 String algo = null; 1416 String hashed = salt + password; 1417 try { 1418 byte[] saltedPassword = (password + salt).getBytes(); 1419 byte[] sha1 = MessageDigest.getInstance(algo = "SHA-1").digest(saltedPassword); 1420 byte[] md5 = MessageDigest.getInstance(algo = "MD5").digest(saltedPassword); 1421 hashed = toHex(sha1) + toHex(md5); 1422 } catch (NoSuchAlgorithmException e) { 1423 Log.w(LOG_TAG, "Failed to encode string because of missing algorithm: " + algo); 1424 } 1425 return hashed; 1426 } 1427 1428 private static String toHex(byte[] ary) { 1429 final String hex = "0123456789ABCDEF"; 1430 String ret = ""; 1431 for (int i = 0; i < ary.length; i++) { 1432 ret += hex.charAt((ary[i] >> 4) & 0xf); 1433 ret += hex.charAt(ary[i] & 0xf); 1434 } 1435 return ret; 1436 } 1437 1438 private int getUidForPackage(String packageName) { 1439 long ident = Binder.clearCallingIdentity(); 1440 try { 1441 return mContext.getPackageManager().getApplicationInfo(packageName, 1442 PackageManager.GET_UNINSTALLED_PACKAGES).uid; 1443 } catch (NameNotFoundException nnfe) { 1444 return -1; 1445 } finally { 1446 Binder.restoreCallingIdentity(ident); 1447 } 1448 } 1449 1450 private Bundle readApplicationRestrictionsLocked(String packageName, 1451 int userId) { 1452 final Bundle restrictions = new Bundle(); 1453 final ArrayList<String> values = new ArrayList<String>(); 1454 1455 FileInputStream fis = null; 1456 try { 1457 AtomicFile restrictionsFile = 1458 new AtomicFile(new File(Environment.getUserSystemDirectory(userId), 1459 packageToRestrictionsFileName(packageName))); 1460 fis = restrictionsFile.openRead(); 1461 XmlPullParser parser = Xml.newPullParser(); 1462 parser.setInput(fis, null); 1463 int type; 1464 while ((type = parser.next()) != XmlPullParser.START_TAG 1465 && type != XmlPullParser.END_DOCUMENT) { 1466 ; 1467 } 1468 1469 if (type != XmlPullParser.START_TAG) { 1470 Slog.e(LOG_TAG, "Unable to read restrictions file " 1471 + restrictionsFile.getBaseFile()); 1472 return restrictions; 1473 } 1474 1475 while ((type = parser.next()) != XmlPullParser.END_DOCUMENT) { 1476 if (type == XmlPullParser.START_TAG && parser.getName().equals(TAG_ENTRY)) { 1477 String key = parser.getAttributeValue(null, ATTR_KEY); 1478 String valType = parser.getAttributeValue(null, ATTR_VALUE_TYPE); 1479 String multiple = parser.getAttributeValue(null, ATTR_MULTIPLE); 1480 if (multiple != null) { 1481 int count = Integer.parseInt(multiple); 1482 while (count > 0 && (type = parser.next()) != XmlPullParser.END_DOCUMENT) { 1483 if (type == XmlPullParser.START_TAG 1484 && parser.getName().equals(TAG_VALUE)) { 1485 values.add(parser.nextText().trim()); 1486 count--; 1487 } 1488 } 1489 String [] valueStrings = new String[values.size()]; 1490 values.toArray(valueStrings); 1491 restrictions.putStringArray(key, valueStrings); 1492 } else if (ATTR_TYPE_BOOLEAN.equals(valType)) { 1493 restrictions.putBoolean(key, Boolean.parseBoolean( 1494 parser.nextText().trim())); 1495 } else { 1496 String value = parser.nextText().trim(); 1497 restrictions.putString(key, value); 1498 } 1499 } 1500 } 1501 1502 } catch (IOException ioe) { 1503 } catch (XmlPullParserException pe) { 1504 } finally { 1505 if (fis != null) { 1506 try { 1507 fis.close(); 1508 } catch (IOException e) { 1509 } 1510 } 1511 } 1512 return restrictions; 1513 } 1514 1515 private void writeApplicationRestrictionsLocked(String packageName, 1516 Bundle restrictions, int userId) { 1517 FileOutputStream fos = null; 1518 AtomicFile restrictionsFile = new AtomicFile( 1519 new File(Environment.getUserSystemDirectory(userId), 1520 packageToRestrictionsFileName(packageName))); 1521 try { 1522 fos = restrictionsFile.startWrite(); 1523 final BufferedOutputStream bos = new BufferedOutputStream(fos); 1524 1525 // XmlSerializer serializer = XmlUtils.serializerInstance(); 1526 final XmlSerializer serializer = new FastXmlSerializer(); 1527 serializer.setOutput(bos, "utf-8"); 1528 serializer.startDocument(null, true); 1529 serializer.setFeature("http://xmlpull.org/v1/doc/features.html#indent-output", true); 1530 1531 serializer.startTag(null, TAG_RESTRICTIONS); 1532 1533 for (String key : restrictions.keySet()) { 1534 Object value = restrictions.get(key); 1535 serializer.startTag(null, TAG_ENTRY); 1536 serializer.attribute(null, ATTR_KEY, key); 1537 1538 if (value instanceof Boolean) { 1539 serializer.attribute(null, ATTR_VALUE_TYPE, ATTR_TYPE_BOOLEAN); 1540 serializer.text(value.toString()); 1541 } else if (value == null || value instanceof String) { 1542 serializer.attribute(null, ATTR_VALUE_TYPE, ATTR_TYPE_STRING); 1543 serializer.text(value != null ? (String) value : ""); 1544 } else { 1545 serializer.attribute(null, ATTR_VALUE_TYPE, ATTR_TYPE_STRING_ARRAY); 1546 String[] values = (String[]) value; 1547 serializer.attribute(null, ATTR_MULTIPLE, Integer.toString(values.length)); 1548 for (String choice : values) { 1549 serializer.startTag(null, TAG_VALUE); 1550 serializer.text(choice != null ? choice : ""); 1551 serializer.endTag(null, TAG_VALUE); 1552 } 1553 } 1554 serializer.endTag(null, TAG_ENTRY); 1555 } 1556 1557 serializer.endTag(null, TAG_RESTRICTIONS); 1558 1559 serializer.endDocument(); 1560 restrictionsFile.finishWrite(fos); 1561 } catch (Exception e) { 1562 restrictionsFile.failWrite(fos); 1563 Slog.e(LOG_TAG, "Error writing application restrictions list"); 1564 } 1565 } 1566 1567 @Override 1568 public int getUserSerialNumber(int userHandle) { 1569 synchronized (mPackagesLock) { 1570 if (!exists(userHandle)) return -1; 1571 return getUserInfoLocked(userHandle).serialNumber; 1572 } 1573 } 1574 1575 @Override 1576 public int getUserHandle(int userSerialNumber) { 1577 synchronized (mPackagesLock) { 1578 for (int userId : mUserIds) { 1579 if (getUserInfoLocked(userId).serialNumber == userSerialNumber) return userId; 1580 } 1581 // Not found 1582 return -1; 1583 } 1584 } 1585 1586 /** 1587 * Caches the list of user ids in an array, adjusting the array size when necessary. 1588 */ 1589 private void updateUserIdsLocked() { 1590 int num = 0; 1591 for (int i = 0; i < mUsers.size(); i++) { 1592 if (!mUsers.valueAt(i).partial) { 1593 num++; 1594 } 1595 } 1596 final int[] newUsers = new int[num]; 1597 int n = 0; 1598 for (int i = 0; i < mUsers.size(); i++) { 1599 if (!mUsers.valueAt(i).partial) { 1600 newUsers[n++] = mUsers.keyAt(i); 1601 } 1602 } 1603 mUserIds = newUsers; 1604 } 1605 1606 /** 1607 * Make a note of the last started time of a user and do some cleanup. 1608 * @param userId the user that was just foregrounded 1609 */ 1610 public void userForeground(int userId) { 1611 synchronized (mPackagesLock) { 1612 UserInfo user = mUsers.get(userId); 1613 long now = System.currentTimeMillis(); 1614 if (user == null || user.partial) { 1615 Slog.w(LOG_TAG, "userForeground: unknown user #" + userId); 1616 return; 1617 } 1618 if (now > EPOCH_PLUS_30_YEARS) { 1619 user.lastLoggedInTime = now; 1620 writeUserLocked(user); 1621 } 1622 // If this is not a restricted profile and there is no restrictions pin, clean up 1623 // all restrictions files that might have been left behind, else clean up just the 1624 // ones with uninstalled packages 1625 RestrictionsPinState pinState = mRestrictionsPinStates.get(userId); 1626 final long salt = pinState == null ? 0 : pinState.salt; 1627 cleanAppRestrictions(userId, (!user.isRestricted() && salt == 0)); 1628 } 1629 } 1630 1631 /** 1632 * Returns the next available user id, filling in any holes in the ids. 1633 * TODO: May not be a good idea to recycle ids, in case it results in confusion 1634 * for data and battery stats collection, or unexpected cross-talk. 1635 * @return 1636 */ 1637 private int getNextAvailableIdLocked() { 1638 synchronized (mPackagesLock) { 1639 int i = MIN_USER_ID; 1640 while (i < Integer.MAX_VALUE) { 1641 if (mUsers.indexOfKey(i) < 0 && !mRemovingUserIds.get(i)) { 1642 break; 1643 } 1644 i++; 1645 } 1646 return i; 1647 } 1648 } 1649 1650 private String packageToRestrictionsFileName(String packageName) { 1651 return RESTRICTIONS_FILE_PREFIX + packageName + XML_SUFFIX; 1652 } 1653 1654 private String restrictionsFileNameToPackage(String fileName) { 1655 return fileName.substring(RESTRICTIONS_FILE_PREFIX.length(), 1656 (int) (fileName.length() - XML_SUFFIX.length())); 1657 } 1658 1659 @Override 1660 protected void dump(FileDescriptor fd, PrintWriter pw, String[] args) { 1661 if (mContext.checkCallingOrSelfPermission(android.Manifest.permission.DUMP) 1662 != PackageManager.PERMISSION_GRANTED) { 1663 pw.println("Permission Denial: can't dump UserManager from from pid=" 1664 + Binder.getCallingPid() 1665 + ", uid=" + Binder.getCallingUid() 1666 + " without permission " 1667 + android.Manifest.permission.DUMP); 1668 return; 1669 } 1670 1671 long now = System.currentTimeMillis(); 1672 StringBuilder sb = new StringBuilder(); 1673 synchronized (mPackagesLock) { 1674 pw.println("Users:"); 1675 for (int i = 0; i < mUsers.size(); i++) { 1676 UserInfo user = mUsers.valueAt(i); 1677 if (user == null) continue; 1678 pw.print(" "); pw.print(user); pw.print(" serialNo="); pw.print(user.serialNumber); 1679 if (mRemovingUserIds.get(mUsers.keyAt(i))) pw.print(" <removing> "); 1680 if (user.partial) pw.print(" <partial>"); 1681 pw.println(); 1682 pw.print(" Created: "); 1683 if (user.creationTime == 0) { 1684 pw.println("<unknown>"); 1685 } else { 1686 sb.setLength(0); 1687 TimeUtils.formatDuration(now - user.creationTime, sb); 1688 sb.append(" ago"); 1689 pw.println(sb); 1690 } 1691 pw.print(" Last logged in: "); 1692 if (user.lastLoggedInTime == 0) { 1693 pw.println("<unknown>"); 1694 } else { 1695 sb.setLength(0); 1696 TimeUtils.formatDuration(now - user.lastLoggedInTime, sb); 1697 sb.append(" ago"); 1698 pw.println(sb); 1699 } 1700 } 1701 } 1702 } 1703 1704 private PackageMonitor mUserPackageMonitor = new PackageMonitor() { 1705 @Override 1706 public void onPackageRemoved(String pkg, int uid) { 1707 final int userId = this.getChangingUserId(); 1708 // Package could be disappearing because it is being blocked, so also check if 1709 // it has been uninstalled. 1710 final boolean uninstalled = isPackageDisappearing(pkg) == PACKAGE_PERMANENT_CHANGE; 1711 if (uninstalled && userId >= 0 && !isPackageInstalled(pkg, userId)) { 1712 cleanAppRestrictionsForPackage(pkg, userId); 1713 } 1714 } 1715 }; 1716} 1717