UserManagerService.java revision f8d3a232e8df65aa75545963ee0ccf753b2d8fb9
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.IStopUserCallback; 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.graphics.BitmapFactory; 35import android.os.Binder; 36import android.os.Bundle; 37import android.os.Environment; 38import android.os.FileUtils; 39import android.os.Handler; 40import android.os.IUserManager; 41import android.os.Process; 42import android.os.RemoteException; 43import android.os.UserHandle; 44import android.os.UserManager; 45import android.util.AtomicFile; 46import android.util.Log; 47import android.util.Slog; 48import android.util.SparseArray; 49import android.util.SparseBooleanArray; 50import android.util.TimeUtils; 51import android.util.Xml; 52 53import com.android.internal.content.PackageMonitor; 54import com.android.internal.util.ArrayUtils; 55import com.android.internal.util.FastXmlSerializer; 56 57import org.xmlpull.v1.XmlPullParser; 58import org.xmlpull.v1.XmlPullParserException; 59import org.xmlpull.v1.XmlSerializer; 60 61import java.io.BufferedOutputStream; 62import java.io.File; 63import java.io.FileDescriptor; 64import java.io.FileInputStream; 65import java.io.FileNotFoundException; 66import java.io.FileOutputStream; 67import java.io.IOException; 68import java.io.PrintWriter; 69import java.security.MessageDigest; 70import java.security.NoSuchAlgorithmException; 71import java.security.SecureRandom; 72import java.util.ArrayList; 73import java.util.List; 74 75public class UserManagerService extends IUserManager.Stub { 76 77 private static final String LOG_TAG = "UserManagerService"; 78 79 private static final boolean DBG = false; 80 81 private static final String TAG_NAME = "name"; 82 private static final String ATTR_FLAGS = "flags"; 83 private static final String ATTR_ICON_PATH = "icon"; 84 private static final String ATTR_ID = "id"; 85 private static final String ATTR_CREATION_TIME = "created"; 86 private static final String ATTR_LAST_LOGGED_IN_TIME = "lastLoggedIn"; 87 private static final String ATTR_SALT = "salt"; 88 private static final String ATTR_PIN_HASH = "pinHash"; 89 private static final String ATTR_FAILED_ATTEMPTS = "failedAttempts"; 90 private static final String ATTR_LAST_RETRY_MS = "lastAttemptMs"; 91 private static final String ATTR_SERIAL_NO = "serialNumber"; 92 private static final String ATTR_NEXT_SERIAL_NO = "nextSerialNumber"; 93 private static final String ATTR_PARTIAL = "partial"; 94 private static final String ATTR_USER_VERSION = "version"; 95 private static final String ATTR_PROFILE_GROUP_ID = "profileGroupId"; 96 private static final String TAG_USERS = "users"; 97 private static final String TAG_USER = "user"; 98 private static final String TAG_RESTRICTIONS = "restrictions"; 99 private static final String TAG_ENTRY = "entry"; 100 private static final String TAG_VALUE = "value"; 101 private static final String ATTR_KEY = "key"; 102 private static final String ATTR_VALUE_TYPE = "type"; 103 private static final String ATTR_MULTIPLE = "m"; 104 105 private static final String ATTR_TYPE_STRING_ARRAY = "sa"; 106 private static final String ATTR_TYPE_STRING = "s"; 107 private static final String ATTR_TYPE_BOOLEAN = "b"; 108 109 private static final String USER_INFO_DIR = "system" + File.separator + "users"; 110 private static final String USER_LIST_FILENAME = "userlist.xml"; 111 private static final String USER_PHOTO_FILENAME = "photo.png"; 112 113 private static final String RESTRICTIONS_FILE_PREFIX = "res_"; 114 private static final String XML_SUFFIX = ".xml"; 115 116 private static final int MIN_USER_ID = 10; 117 118 private static final int USER_VERSION = 4; 119 120 private static final long EPOCH_PLUS_30_YEARS = 30L * 365 * 24 * 60 * 60 * 1000L; // ms 121 122 // Number of attempts before jumping to the next BACKOFF_TIMES slot 123 private static final int BACKOFF_INC_INTERVAL = 5; 124 125 // Amount of time to force the user to wait before entering the PIN again, after failing 126 // BACKOFF_INC_INTERVAL times. 127 private static final int[] BACKOFF_TIMES = { 0, 30*1000, 60*1000, 5*60*1000, 30*60*1000 }; 128 129 private final Context mContext; 130 private final PackageManagerService mPm; 131 private final Object mInstallLock; 132 private final Object mPackagesLock; 133 134 private final Handler mHandler; 135 136 private final File mUsersDir; 137 private final File mUserListFile; 138 private final File mBaseUserPath; 139 140 private final SparseArray<UserInfo> mUsers = new SparseArray<UserInfo>(); 141 private final SparseArray<Bundle> mUserRestrictions = new SparseArray<Bundle>(); 142 143 class RestrictionsPinState { 144 long salt; 145 String pinHash; 146 int failedAttempts; 147 long lastAttemptTime; 148 } 149 150 private final SparseArray<RestrictionsPinState> mRestrictionsPinStates = 151 new SparseArray<RestrictionsPinState>(); 152 153 /** 154 * Set of user IDs being actively removed. Removed IDs linger in this set 155 * for several seconds to work around a VFS caching issue. 156 */ 157 // @GuardedBy("mPackagesLock") 158 private final SparseBooleanArray mRemovingUserIds = new SparseBooleanArray(); 159 160 private int[] mUserIds; 161 private boolean mGuestEnabled; 162 private int mNextSerialNumber; 163 private int mUserVersion = 0; 164 165 private static UserManagerService sInstance; 166 167 public static UserManagerService getInstance() { 168 synchronized (UserManagerService.class) { 169 return sInstance; 170 } 171 } 172 173 /** 174 * Available for testing purposes. 175 */ 176 UserManagerService(File dataDir, File baseUserPath) { 177 this(null, null, new Object(), new Object(), dataDir, baseUserPath); 178 } 179 180 /** 181 * Called by package manager to create the service. This is closely 182 * associated with the package manager, and the given lock is the 183 * package manager's own lock. 184 */ 185 UserManagerService(Context context, PackageManagerService pm, 186 Object installLock, Object packagesLock) { 187 this(context, pm, installLock, packagesLock, 188 Environment.getDataDirectory(), 189 new File(Environment.getDataDirectory(), "user")); 190 } 191 192 /** 193 * Available for testing purposes. 194 */ 195 private UserManagerService(Context context, PackageManagerService pm, 196 Object installLock, Object packagesLock, 197 File dataDir, File baseUserPath) { 198 mContext = context; 199 mPm = pm; 200 mInstallLock = installLock; 201 mPackagesLock = packagesLock; 202 mHandler = new Handler(); 203 synchronized (mInstallLock) { 204 synchronized (mPackagesLock) { 205 mUsersDir = new File(dataDir, USER_INFO_DIR); 206 mUsersDir.mkdirs(); 207 // Make zeroth user directory, for services to migrate their files to that location 208 File userZeroDir = new File(mUsersDir, "0"); 209 userZeroDir.mkdirs(); 210 mBaseUserPath = baseUserPath; 211 FileUtils.setPermissions(mUsersDir.toString(), 212 FileUtils.S_IRWXU|FileUtils.S_IRWXG 213 |FileUtils.S_IROTH|FileUtils.S_IXOTH, 214 -1, -1); 215 mUserListFile = new File(mUsersDir, USER_LIST_FILENAME); 216 readUserListLocked(); 217 // Prune out any partially created/partially removed users. 218 ArrayList<UserInfo> partials = new ArrayList<UserInfo>(); 219 for (int i = 0; i < mUsers.size(); i++) { 220 UserInfo ui = mUsers.valueAt(i); 221 if (ui.partial && i != 0) { 222 partials.add(ui); 223 } 224 } 225 for (int i = 0; i < partials.size(); i++) { 226 UserInfo ui = partials.get(i); 227 Slog.w(LOG_TAG, "Removing partially created user #" + i 228 + " (name=" + ui.name + ")"); 229 removeUserStateLocked(ui.id); 230 } 231 sInstance = this; 232 } 233 } 234 } 235 236 void systemReady() { 237 mUserPackageMonitor.register(mContext, null, UserHandle.ALL, false); 238 userForeground(UserHandle.USER_OWNER); 239 } 240 241 @Override 242 public List<UserInfo> getUsers(boolean excludeDying) { 243 checkManageUsersPermission("query users"); 244 synchronized (mPackagesLock) { 245 ArrayList<UserInfo> users = new ArrayList<UserInfo>(mUsers.size()); 246 for (int i = 0; i < mUsers.size(); i++) { 247 UserInfo ui = mUsers.valueAt(i); 248 if (ui.partial) { 249 continue; 250 } 251 if (!excludeDying || !mRemovingUserIds.get(ui.id)) { 252 users.add(ui); 253 } 254 } 255 return users; 256 } 257 } 258 259 @Override 260 public List<UserInfo> getProfiles(int userId, boolean enabledOnly) { 261 if (userId != UserHandle.getCallingUserId()) { 262 checkManageUsersPermission("getting profiles related to user " + userId); 263 } 264 final long ident = Binder.clearCallingIdentity(); 265 try { 266 synchronized (mPackagesLock) { 267 return getProfilesLocked(userId, enabledOnly); 268 } 269 } finally { 270 Binder.restoreCallingIdentity(ident); 271 } 272 } 273 274 /** Assume permissions already checked and caller's identity cleared */ 275 private List<UserInfo> getProfilesLocked(int userId, boolean enabledOnly) { 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 if (enabledOnly && !profile.isEnabled()) { 284 continue; 285 } 286 users.add(profile); 287 } 288 return users; 289 } 290 291 @Override 292 public UserInfo getProfileParent(int userHandle) { 293 checkManageUsersPermission("get the profile parent"); 294 synchronized (mPackagesLock) { 295 UserInfo profile = getUserInfoLocked(userHandle); 296 int parentUserId = profile.profileGroupId; 297 if (parentUserId == UserInfo.NO_PROFILE_GROUP_ID) { 298 return null; 299 } else { 300 return getUserInfoLocked(parentUserId); 301 } 302 } 303 } 304 305 private boolean isProfileOf(UserInfo user, UserInfo profile) { 306 return user.id == profile.id || 307 (user.profileGroupId != UserInfo.NO_PROFILE_GROUP_ID 308 && user.profileGroupId == profile.profileGroupId); 309 } 310 311 @Override 312 public void setUserEnabled(int userId) { 313 checkManageUsersPermission("enable user"); 314 synchronized (mPackagesLock) { 315 UserInfo info = getUserInfoLocked(userId); 316 if (info != null && !info.isEnabled()) { 317 info.flags ^= UserInfo.FLAG_DISABLED; 318 writeUserLocked(info); 319 } 320 } 321 } 322 323 @Override 324 public UserInfo getUserInfo(int userId) { 325 checkManageUsersPermission("query user"); 326 synchronized (mPackagesLock) { 327 return getUserInfoLocked(userId); 328 } 329 } 330 331 @Override 332 public boolean isRestricted() { 333 synchronized (mPackagesLock) { 334 return getUserInfoLocked(UserHandle.getCallingUserId()).isRestricted(); 335 } 336 } 337 338 /* 339 * Should be locked on mUsers before calling this. 340 */ 341 private UserInfo getUserInfoLocked(int userId) { 342 UserInfo ui = mUsers.get(userId); 343 // If it is partial and not in the process of being removed, return as unknown user. 344 if (ui != null && ui.partial && !mRemovingUserIds.get(userId)) { 345 Slog.w(LOG_TAG, "getUserInfo: unknown user #" + userId); 346 return null; 347 } 348 return ui; 349 } 350 351 public boolean exists(int userId) { 352 synchronized (mPackagesLock) { 353 return ArrayUtils.contains(mUserIds, userId); 354 } 355 } 356 357 @Override 358 public void setUserName(int userId, String name) { 359 checkManageUsersPermission("rename users"); 360 boolean changed = false; 361 synchronized (mPackagesLock) { 362 UserInfo info = mUsers.get(userId); 363 if (info == null || info.partial) { 364 Slog.w(LOG_TAG, "setUserName: unknown user #" + userId); 365 return; 366 } 367 if (name != null && !name.equals(info.name)) { 368 info.name = name; 369 writeUserLocked(info); 370 changed = true; 371 } 372 } 373 if (changed) { 374 sendUserInfoChangedBroadcast(userId); 375 } 376 } 377 378 @Override 379 public void setUserIcon(int userId, Bitmap bitmap) { 380 checkManageUsersPermission("update users"); 381 synchronized (mPackagesLock) { 382 UserInfo info = mUsers.get(userId); 383 if (info == null || info.partial) { 384 Slog.w(LOG_TAG, "setUserIcon: unknown user #" + userId); 385 return; 386 } 387 writeBitmapLocked(info, bitmap); 388 writeUserLocked(info); 389 } 390 sendUserInfoChangedBroadcast(userId); 391 } 392 393 private void sendUserInfoChangedBroadcast(int userId) { 394 Intent changedIntent = new Intent(Intent.ACTION_USER_INFO_CHANGED); 395 changedIntent.putExtra(Intent.EXTRA_USER_HANDLE, userId); 396 changedIntent.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY); 397 mContext.sendBroadcastAsUser(changedIntent, UserHandle.ALL); 398 } 399 400 @Override 401 public Bitmap getUserIcon(int userId) { 402 checkManageUsersPermission("read users"); 403 synchronized (mPackagesLock) { 404 UserInfo info = mUsers.get(userId); 405 if (info == null || info.partial) { 406 Slog.w(LOG_TAG, "getUserIcon: unknown user #" + userId); 407 return null; 408 } 409 if (info.iconPath == null) { 410 return null; 411 } 412 return BitmapFactory.decodeFile(info.iconPath); 413 } 414 } 415 416 @Override 417 public void setGuestEnabled(boolean enable) { 418 checkManageUsersPermission("enable guest users"); 419 synchronized (mPackagesLock) { 420 if (mGuestEnabled != enable) { 421 mGuestEnabled = enable; 422 // Erase any guest user that currently exists 423 for (int i = 0; i < mUsers.size(); i++) { 424 UserInfo user = mUsers.valueAt(i); 425 if (!user.partial && user.isGuest()) { 426 if (!enable) { 427 removeUser(user.id); 428 } 429 return; 430 } 431 } 432 // No guest was found 433 if (enable) { 434 createUser("Guest", UserInfo.FLAG_GUEST); 435 } 436 } 437 } 438 } 439 440 @Override 441 public boolean isGuestEnabled() { 442 synchronized (mPackagesLock) { 443 return mGuestEnabled; 444 } 445 } 446 447 @Override 448 public void wipeUser(int userHandle) { 449 checkManageUsersPermission("wipe user"); 450 // TODO: 451 } 452 453 public void makeInitialized(int userId) { 454 checkManageUsersPermission("makeInitialized"); 455 synchronized (mPackagesLock) { 456 UserInfo info = mUsers.get(userId); 457 if (info == null || info.partial) { 458 Slog.w(LOG_TAG, "makeInitialized: unknown user #" + userId); 459 } 460 if ((info.flags&UserInfo.FLAG_INITIALIZED) == 0) { 461 info.flags |= UserInfo.FLAG_INITIALIZED; 462 writeUserLocked(info); 463 } 464 } 465 } 466 467 @Override 468 public Bundle getUserRestrictions(int userId) { 469 // checkManageUsersPermission("getUserRestrictions"); 470 471 synchronized (mPackagesLock) { 472 Bundle restrictions = mUserRestrictions.get(userId); 473 return restrictions != null ? new Bundle(restrictions) : new Bundle(); 474 } 475 } 476 477 @Override 478 public void setUserRestrictions(Bundle restrictions, int userId) { 479 checkManageUsersPermission("setUserRestrictions"); 480 if (restrictions == null) return; 481 482 synchronized (mPackagesLock) { 483 mUserRestrictions.get(userId).clear(); 484 mUserRestrictions.get(userId).putAll(restrictions); 485 writeUserLocked(mUsers.get(userId)); 486 } 487 } 488 489 /** 490 * Check if we've hit the limit of how many users can be created. 491 */ 492 private boolean isUserLimitReachedLocked() { 493 int nUsers = mUsers.size(); 494 return nUsers >= UserManager.getMaxSupportedUsers(); 495 } 496 497 /** 498 * Enforces that only the system UID or root's UID or apps that have the 499 * {@link android.Manifest.permission#MANAGE_USERS MANAGE_USERS} 500 * permission can make certain calls to the UserManager. 501 * 502 * @param message used as message if SecurityException is thrown 503 * @throws SecurityException if the caller is not system or root 504 */ 505 private static final void checkManageUsersPermission(String message) { 506 final int uid = Binder.getCallingUid(); 507 if (uid != Process.SYSTEM_UID && uid != 0 508 && ActivityManager.checkComponentPermission( 509 android.Manifest.permission.MANAGE_USERS, 510 uid, -1, true) != PackageManager.PERMISSION_GRANTED) { 511 throw new SecurityException("You need MANAGE_USERS permission to: " + message); 512 } 513 } 514 515 private void writeBitmapLocked(UserInfo info, Bitmap bitmap) { 516 try { 517 File dir = new File(mUsersDir, Integer.toString(info.id)); 518 File file = new File(dir, USER_PHOTO_FILENAME); 519 if (!dir.exists()) { 520 dir.mkdir(); 521 FileUtils.setPermissions( 522 dir.getPath(), 523 FileUtils.S_IRWXU|FileUtils.S_IRWXG|FileUtils.S_IXOTH, 524 -1, -1); 525 } 526 FileOutputStream os; 527 if (bitmap.compress(Bitmap.CompressFormat.PNG, 100, os = new FileOutputStream(file))) { 528 info.iconPath = file.getAbsolutePath(); 529 } 530 try { 531 os.close(); 532 } catch (IOException ioe) { 533 // What the ... ! 534 } 535 } catch (FileNotFoundException e) { 536 Slog.w(LOG_TAG, "Error setting photo for user ", e); 537 } 538 } 539 540 /** 541 * Returns an array of user ids. This array is cached here for quick access, so do not modify or 542 * cache it elsewhere. 543 * @return the array of user ids. 544 */ 545 public int[] getUserIds() { 546 synchronized (mPackagesLock) { 547 return mUserIds; 548 } 549 } 550 551 int[] getUserIdsLPr() { 552 return mUserIds; 553 } 554 555 private void readUserListLocked() { 556 mGuestEnabled = false; 557 if (!mUserListFile.exists()) { 558 fallbackToSingleUserLocked(); 559 return; 560 } 561 FileInputStream fis = null; 562 AtomicFile userListFile = new AtomicFile(mUserListFile); 563 try { 564 fis = userListFile.openRead(); 565 XmlPullParser parser = Xml.newPullParser(); 566 parser.setInput(fis, null); 567 int type; 568 while ((type = parser.next()) != XmlPullParser.START_TAG 569 && type != XmlPullParser.END_DOCUMENT) { 570 ; 571 } 572 573 if (type != XmlPullParser.START_TAG) { 574 Slog.e(LOG_TAG, "Unable to read user list"); 575 fallbackToSingleUserLocked(); 576 return; 577 } 578 579 mNextSerialNumber = -1; 580 if (parser.getName().equals(TAG_USERS)) { 581 String lastSerialNumber = parser.getAttributeValue(null, ATTR_NEXT_SERIAL_NO); 582 if (lastSerialNumber != null) { 583 mNextSerialNumber = Integer.parseInt(lastSerialNumber); 584 } 585 String versionNumber = parser.getAttributeValue(null, ATTR_USER_VERSION); 586 if (versionNumber != null) { 587 mUserVersion = Integer.parseInt(versionNumber); 588 } 589 } 590 591 while ((type = parser.next()) != XmlPullParser.END_DOCUMENT) { 592 if (type == XmlPullParser.START_TAG && parser.getName().equals(TAG_USER)) { 593 String id = parser.getAttributeValue(null, ATTR_ID); 594 UserInfo user = readUserLocked(Integer.parseInt(id)); 595 596 if (user != null) { 597 mUsers.put(user.id, user); 598 if (user.isGuest()) { 599 mGuestEnabled = true; 600 } 601 if (mNextSerialNumber < 0 || mNextSerialNumber <= user.id) { 602 mNextSerialNumber = user.id + 1; 603 } 604 } 605 } 606 } 607 updateUserIdsLocked(); 608 upgradeIfNecessaryLocked(); 609 } catch (IOException ioe) { 610 fallbackToSingleUserLocked(); 611 } catch (XmlPullParserException pe) { 612 fallbackToSingleUserLocked(); 613 } finally { 614 if (fis != null) { 615 try { 616 fis.close(); 617 } catch (IOException e) { 618 } 619 } 620 } 621 } 622 623 /** 624 * Upgrade steps between versions, either for fixing bugs or changing the data format. 625 */ 626 private void upgradeIfNecessaryLocked() { 627 int userVersion = mUserVersion; 628 if (userVersion < 1) { 629 // Assign a proper name for the owner, if not initialized correctly before 630 UserInfo user = mUsers.get(UserHandle.USER_OWNER); 631 if ("Primary".equals(user.name)) { 632 user.name = mContext.getResources().getString(com.android.internal.R.string.owner_name); 633 writeUserLocked(user); 634 } 635 userVersion = 1; 636 } 637 638 if (userVersion < 2) { 639 // Owner should be marked as initialized 640 UserInfo user = mUsers.get(UserHandle.USER_OWNER); 641 if ((user.flags & UserInfo.FLAG_INITIALIZED) == 0) { 642 user.flags |= UserInfo.FLAG_INITIALIZED; 643 writeUserLocked(user); 644 } 645 userVersion = 2; 646 } 647 648 649 if (userVersion < 4) { 650 userVersion = 4; 651 } 652 653 if (userVersion < USER_VERSION) { 654 Slog.w(LOG_TAG, "User version " + mUserVersion + " didn't upgrade as expected to " 655 + USER_VERSION); 656 } else { 657 mUserVersion = userVersion; 658 writeUserListLocked(); 659 } 660 } 661 662 private void fallbackToSingleUserLocked() { 663 // Create the primary user 664 UserInfo primary = new UserInfo(UserHandle.USER_OWNER, 665 mContext.getResources().getString(com.android.internal.R.string.owner_name), null, 666 UserInfo.FLAG_ADMIN | UserInfo.FLAG_PRIMARY | UserInfo.FLAG_INITIALIZED); 667 mUsers.put(0, primary); 668 mNextSerialNumber = MIN_USER_ID; 669 mUserVersion = USER_VERSION; 670 671 Bundle restrictions = new Bundle(); 672 mUserRestrictions.append(UserHandle.USER_OWNER, restrictions); 673 674 updateUserIdsLocked(); 675 676 writeUserListLocked(); 677 writeUserLocked(primary); 678 } 679 680 /* 681 * Writes the user file in this format: 682 * 683 * <user flags="20039023" id="0"> 684 * <name>Primary</name> 685 * </user> 686 */ 687 private void writeUserLocked(UserInfo userInfo) { 688 FileOutputStream fos = null; 689 AtomicFile userFile = new AtomicFile(new File(mUsersDir, userInfo.id + XML_SUFFIX)); 690 try { 691 fos = userFile.startWrite(); 692 final BufferedOutputStream bos = new BufferedOutputStream(fos); 693 694 // XmlSerializer serializer = XmlUtils.serializerInstance(); 695 final XmlSerializer serializer = new FastXmlSerializer(); 696 serializer.setOutput(bos, "utf-8"); 697 serializer.startDocument(null, true); 698 serializer.setFeature("http://xmlpull.org/v1/doc/features.html#indent-output", true); 699 700 serializer.startTag(null, TAG_USER); 701 serializer.attribute(null, ATTR_ID, Integer.toString(userInfo.id)); 702 serializer.attribute(null, ATTR_SERIAL_NO, Integer.toString(userInfo.serialNumber)); 703 serializer.attribute(null, ATTR_FLAGS, Integer.toString(userInfo.flags)); 704 serializer.attribute(null, ATTR_CREATION_TIME, Long.toString(userInfo.creationTime)); 705 serializer.attribute(null, ATTR_LAST_LOGGED_IN_TIME, 706 Long.toString(userInfo.lastLoggedInTime)); 707 RestrictionsPinState pinState = mRestrictionsPinStates.get(userInfo.id); 708 if (pinState != null) { 709 if (pinState.salt != 0) { 710 serializer.attribute(null, ATTR_SALT, Long.toString(pinState.salt)); 711 } 712 if (pinState.pinHash != null) { 713 serializer.attribute(null, ATTR_PIN_HASH, pinState.pinHash); 714 } 715 if (pinState.failedAttempts != 0) { 716 serializer.attribute(null, ATTR_FAILED_ATTEMPTS, 717 Integer.toString(pinState.failedAttempts)); 718 serializer.attribute(null, ATTR_LAST_RETRY_MS, 719 Long.toString(pinState.lastAttemptTime)); 720 } 721 } 722 if (userInfo.iconPath != null) { 723 serializer.attribute(null, ATTR_ICON_PATH, userInfo.iconPath); 724 } 725 if (userInfo.partial) { 726 serializer.attribute(null, ATTR_PARTIAL, "true"); 727 } 728 if (userInfo.profileGroupId != UserInfo.NO_PROFILE_GROUP_ID) { 729 serializer.attribute(null, ATTR_PROFILE_GROUP_ID, 730 Integer.toString(userInfo.profileGroupId)); 731 } 732 733 serializer.startTag(null, TAG_NAME); 734 serializer.text(userInfo.name); 735 serializer.endTag(null, TAG_NAME); 736 737 Bundle restrictions = mUserRestrictions.get(userInfo.id); 738 if (restrictions != null) { 739 serializer.startTag(null, TAG_RESTRICTIONS); 740 writeBoolean(serializer, restrictions, UserManager.DISALLOW_CONFIG_WIFI); 741 writeBoolean(serializer, restrictions, UserManager.DISALLOW_MODIFY_ACCOUNTS); 742 writeBoolean(serializer, restrictions, UserManager.DISALLOW_INSTALL_APPS); 743 writeBoolean(serializer, restrictions, UserManager.DISALLOW_UNINSTALL_APPS); 744 writeBoolean(serializer, restrictions, UserManager.DISALLOW_SHARE_LOCATION); 745 writeBoolean(serializer, restrictions, 746 UserManager.DISALLOW_INSTALL_UNKNOWN_SOURCES); 747 writeBoolean(serializer, restrictions, UserManager.DISALLOW_CONFIG_BLUETOOTH); 748 writeBoolean(serializer, restrictions, UserManager.DISALLOW_USB_FILE_TRANSFER); 749 writeBoolean(serializer, restrictions, UserManager.DISALLOW_CONFIG_CREDENTIALS); 750 writeBoolean(serializer, restrictions, UserManager.DISALLOW_REMOVE_USER); 751 writeBoolean(serializer, restrictions, UserManager.DISALLOW_DEBUGGING_FEATURES); 752 writeBoolean(serializer, restrictions, UserManager.DISALLOW_CONFIG_VPN); 753 writeBoolean(serializer, restrictions, UserManager.DISALLOW_CONFIG_TETHERING); 754 writeBoolean(serializer, restrictions, UserManager.DISALLOW_FACTORY_RESET); 755 writeBoolean(serializer, restrictions, UserManager.DISALLOW_ADD_USER); 756 writeBoolean(serializer, restrictions, UserManager.ENSURE_VERIFY_APPS); 757 writeBoolean(serializer, restrictions, UserManager.DISALLOW_CONFIG_CELL_BROADCASTS); 758 writeBoolean(serializer, restrictions, UserManager.DISALLOW_CONFIG_MOBILE_NETWORKS); 759 writeBoolean(serializer, restrictions, UserManager.DISALLOW_CONFIG_APPS); 760 writeBoolean(serializer, restrictions, UserManager.DISALLOW_MOUNT_PHYSICAL_MEDIA); 761 writeBoolean(serializer, restrictions, UserManager.DISALLOW_UNMUTE_MICROPHONE); 762 writeBoolean(serializer, restrictions, UserManager.DISALLOW_ADJUST_VOLUME); 763 serializer.endTag(null, TAG_RESTRICTIONS); 764 } 765 serializer.endTag(null, TAG_USER); 766 767 serializer.endDocument(); 768 userFile.finishWrite(fos); 769 } catch (Exception ioe) { 770 Slog.e(LOG_TAG, "Error writing user info " + userInfo.id + "\n" + ioe); 771 userFile.failWrite(fos); 772 } 773 } 774 775 /* 776 * Writes the user list file in this format: 777 * 778 * <users nextSerialNumber="3"> 779 * <user id="0"></user> 780 * <user id="2"></user> 781 * </users> 782 */ 783 private void writeUserListLocked() { 784 FileOutputStream fos = null; 785 AtomicFile userListFile = new AtomicFile(mUserListFile); 786 try { 787 fos = userListFile.startWrite(); 788 final BufferedOutputStream bos = new BufferedOutputStream(fos); 789 790 // XmlSerializer serializer = XmlUtils.serializerInstance(); 791 final XmlSerializer serializer = new FastXmlSerializer(); 792 serializer.setOutput(bos, "utf-8"); 793 serializer.startDocument(null, true); 794 serializer.setFeature("http://xmlpull.org/v1/doc/features.html#indent-output", true); 795 796 serializer.startTag(null, TAG_USERS); 797 serializer.attribute(null, ATTR_NEXT_SERIAL_NO, Integer.toString(mNextSerialNumber)); 798 serializer.attribute(null, ATTR_USER_VERSION, Integer.toString(mUserVersion)); 799 800 for (int i = 0; i < mUsers.size(); i++) { 801 UserInfo user = mUsers.valueAt(i); 802 serializer.startTag(null, TAG_USER); 803 serializer.attribute(null, ATTR_ID, Integer.toString(user.id)); 804 serializer.endTag(null, TAG_USER); 805 } 806 807 serializer.endTag(null, TAG_USERS); 808 809 serializer.endDocument(); 810 userListFile.finishWrite(fos); 811 } catch (Exception e) { 812 userListFile.failWrite(fos); 813 Slog.e(LOG_TAG, "Error writing user list"); 814 } 815 } 816 817 private UserInfo readUserLocked(int id) { 818 int flags = 0; 819 int serialNumber = id; 820 String name = null; 821 String iconPath = null; 822 long creationTime = 0L; 823 long lastLoggedInTime = 0L; 824 long salt = 0L; 825 String pinHash = null; 826 int failedAttempts = 0; 827 int profileGroupId = UserInfo.NO_PROFILE_GROUP_ID; 828 long lastAttemptTime = 0L; 829 boolean partial = false; 830 Bundle restrictions = new Bundle(); 831 832 FileInputStream fis = null; 833 try { 834 AtomicFile userFile = 835 new AtomicFile(new File(mUsersDir, Integer.toString(id) + XML_SUFFIX)); 836 fis = userFile.openRead(); 837 XmlPullParser parser = Xml.newPullParser(); 838 parser.setInput(fis, null); 839 int type; 840 while ((type = parser.next()) != XmlPullParser.START_TAG 841 && type != XmlPullParser.END_DOCUMENT) { 842 ; 843 } 844 845 if (type != XmlPullParser.START_TAG) { 846 Slog.e(LOG_TAG, "Unable to read user " + id); 847 return null; 848 } 849 850 if (type == XmlPullParser.START_TAG && parser.getName().equals(TAG_USER)) { 851 int storedId = readIntAttribute(parser, ATTR_ID, -1); 852 if (storedId != id) { 853 Slog.e(LOG_TAG, "User id does not match the file name"); 854 return null; 855 } 856 serialNumber = readIntAttribute(parser, ATTR_SERIAL_NO, id); 857 flags = readIntAttribute(parser, ATTR_FLAGS, 0); 858 iconPath = parser.getAttributeValue(null, ATTR_ICON_PATH); 859 creationTime = readLongAttribute(parser, ATTR_CREATION_TIME, 0); 860 lastLoggedInTime = readLongAttribute(parser, ATTR_LAST_LOGGED_IN_TIME, 0); 861 salt = readLongAttribute(parser, ATTR_SALT, 0L); 862 pinHash = parser.getAttributeValue(null, ATTR_PIN_HASH); 863 failedAttempts = readIntAttribute(parser, ATTR_FAILED_ATTEMPTS, 0); 864 lastAttemptTime = readLongAttribute(parser, ATTR_LAST_RETRY_MS, 0L); 865 profileGroupId = readIntAttribute(parser, ATTR_PROFILE_GROUP_ID, 866 UserInfo.NO_PROFILE_GROUP_ID); 867 if (profileGroupId == UserInfo.NO_PROFILE_GROUP_ID) { 868 // This attribute was added and renamed during development of L. 869 // TODO Remove upgrade path by 1st May 2014 870 profileGroupId = readIntAttribute(parser, "relatedGroupId", 871 UserInfo.NO_PROFILE_GROUP_ID); 872 } 873 String valueString = parser.getAttributeValue(null, ATTR_PARTIAL); 874 if ("true".equals(valueString)) { 875 partial = true; 876 } 877 878 int outerDepth = parser.getDepth(); 879 while ((type = parser.next()) != XmlPullParser.END_DOCUMENT 880 && (type != XmlPullParser.END_TAG || parser.getDepth() > outerDepth)) { 881 if (type == XmlPullParser.END_TAG || type == XmlPullParser.TEXT) { 882 continue; 883 } 884 String tag = parser.getName(); 885 if (TAG_NAME.equals(tag)) { 886 type = parser.next(); 887 if (type == XmlPullParser.TEXT) { 888 name = parser.getText(); 889 } 890 } else if (TAG_RESTRICTIONS.equals(tag)) { 891 readBoolean(parser, restrictions, UserManager.DISALLOW_CONFIG_WIFI); 892 readBoolean(parser, restrictions, UserManager.DISALLOW_MODIFY_ACCOUNTS); 893 readBoolean(parser, restrictions, UserManager.DISALLOW_INSTALL_APPS); 894 readBoolean(parser, restrictions, UserManager.DISALLOW_UNINSTALL_APPS); 895 readBoolean(parser, restrictions, UserManager.DISALLOW_SHARE_LOCATION); 896 readBoolean(parser, restrictions, 897 UserManager.DISALLOW_INSTALL_UNKNOWN_SOURCES); 898 readBoolean(parser, restrictions, UserManager.DISALLOW_CONFIG_BLUETOOTH); 899 readBoolean(parser, restrictions, UserManager.DISALLOW_USB_FILE_TRANSFER); 900 readBoolean(parser, restrictions, UserManager.DISALLOW_CONFIG_CREDENTIALS); 901 readBoolean(parser, restrictions, UserManager.DISALLOW_REMOVE_USER); 902 readBoolean(parser, restrictions, UserManager.DISALLOW_DEBUGGING_FEATURES); 903 readBoolean(parser, restrictions, UserManager.DISALLOW_CONFIG_VPN); 904 readBoolean(parser, restrictions, UserManager.DISALLOW_CONFIG_TETHERING); 905 readBoolean(parser, restrictions, UserManager.DISALLOW_FACTORY_RESET); 906 readBoolean(parser, restrictions, UserManager.DISALLOW_ADD_USER); 907 readBoolean(parser, restrictions, UserManager.ENSURE_VERIFY_APPS); 908 readBoolean(parser, restrictions, UserManager.DISALLOW_CONFIG_CELL_BROADCASTS); 909 readBoolean(parser, restrictions, UserManager.DISALLOW_CONFIG_MOBILE_NETWORKS); 910 readBoolean(parser, restrictions, UserManager.DISALLOW_CONFIG_APPS); 911 readBoolean(parser, restrictions, 912 UserManager.DISALLOW_MOUNT_PHYSICAL_MEDIA); 913 readBoolean(parser, restrictions, UserManager.DISALLOW_UNMUTE_MICROPHONE); 914 readBoolean(parser, restrictions, UserManager.DISALLOW_ADJUST_VOLUME); 915 } 916 } 917 } 918 919 UserInfo userInfo = new UserInfo(id, name, iconPath, flags); 920 userInfo.serialNumber = serialNumber; 921 userInfo.creationTime = creationTime; 922 userInfo.lastLoggedInTime = lastLoggedInTime; 923 userInfo.partial = partial; 924 userInfo.profileGroupId = profileGroupId; 925 mUserRestrictions.append(id, restrictions); 926 if (salt != 0L) { 927 RestrictionsPinState pinState = mRestrictionsPinStates.get(id); 928 if (pinState == null) { 929 pinState = new RestrictionsPinState(); 930 mRestrictionsPinStates.put(id, pinState); 931 } 932 pinState.salt = salt; 933 pinState.pinHash = pinHash; 934 pinState.failedAttempts = failedAttempts; 935 pinState.lastAttemptTime = lastAttemptTime; 936 } 937 return userInfo; 938 939 } catch (IOException ioe) { 940 } catch (XmlPullParserException pe) { 941 } finally { 942 if (fis != null) { 943 try { 944 fis.close(); 945 } catch (IOException e) { 946 } 947 } 948 } 949 return null; 950 } 951 952 private void readBoolean(XmlPullParser parser, Bundle restrictions, 953 String restrictionKey) { 954 String value = parser.getAttributeValue(null, restrictionKey); 955 if (value != null) { 956 restrictions.putBoolean(restrictionKey, Boolean.parseBoolean(value)); 957 } 958 } 959 960 private void writeBoolean(XmlSerializer xml, Bundle restrictions, String restrictionKey) 961 throws IOException { 962 if (restrictions.containsKey(restrictionKey)) { 963 xml.attribute(null, restrictionKey, 964 Boolean.toString(restrictions.getBoolean(restrictionKey))); 965 } 966 } 967 968 private int readIntAttribute(XmlPullParser parser, String attr, int defaultValue) { 969 String valueString = parser.getAttributeValue(null, attr); 970 if (valueString == null) return defaultValue; 971 try { 972 return Integer.parseInt(valueString); 973 } catch (NumberFormatException nfe) { 974 return defaultValue; 975 } 976 } 977 978 private long readLongAttribute(XmlPullParser parser, String attr, long defaultValue) { 979 String valueString = parser.getAttributeValue(null, attr); 980 if (valueString == null) return defaultValue; 981 try { 982 return Long.parseLong(valueString); 983 } catch (NumberFormatException nfe) { 984 return defaultValue; 985 } 986 } 987 988 private boolean isPackageInstalled(String pkg, int userId) { 989 final ApplicationInfo info = mPm.getApplicationInfo(pkg, 990 PackageManager.GET_UNINSTALLED_PACKAGES, 991 userId); 992 if (info == null || (info.flags&ApplicationInfo.FLAG_INSTALLED) == 0) { 993 return false; 994 } 995 return true; 996 } 997 998 /** 999 * Removes all the restrictions files (res_<packagename>) for a given user, if all is true, 1000 * else removes only those packages that have been uninstalled. 1001 * Does not do any permissions checking. 1002 */ 1003 private void cleanAppRestrictions(int userId, boolean all) { 1004 synchronized (mPackagesLock) { 1005 File dir = Environment.getUserSystemDirectory(userId); 1006 String[] files = dir.list(); 1007 if (files == null) return; 1008 for (String fileName : files) { 1009 if (fileName.startsWith(RESTRICTIONS_FILE_PREFIX)) { 1010 File resFile = new File(dir, fileName); 1011 if (resFile.exists()) { 1012 if (all) { 1013 resFile.delete(); 1014 } else { 1015 String pkg = restrictionsFileNameToPackage(fileName); 1016 if (!isPackageInstalled(pkg, userId)) { 1017 resFile.delete(); 1018 } 1019 } 1020 } 1021 } 1022 } 1023 } 1024 } 1025 1026 /** 1027 * Removes the app restrictions file for a specific package and user id, if it exists. 1028 */ 1029 private void cleanAppRestrictionsForPackage(String pkg, int userId) { 1030 synchronized (mPackagesLock) { 1031 File dir = Environment.getUserSystemDirectory(userId); 1032 File resFile = new File(dir, packageToRestrictionsFileName(pkg)); 1033 if (resFile.exists()) { 1034 resFile.delete(); 1035 } 1036 } 1037 } 1038 1039 @Override 1040 public UserInfo createProfileForUser(String name, int flags, int userId) { 1041 checkManageUsersPermission("Only the system can create users"); 1042 if (userId != UserHandle.USER_OWNER) { 1043 Slog.w(LOG_TAG, "Only user owner can have profiles"); 1044 return null; 1045 } 1046 return createUserInternal(name, flags, userId); 1047 } 1048 1049 @Override 1050 public UserInfo createUser(String name, int flags) { 1051 checkManageUsersPermission("Only the system can create users"); 1052 return createUserInternal(name, flags, UserHandle.USER_NULL); 1053 } 1054 1055 private UserInfo createUserInternal(String name, int flags, int parentId) { 1056 final long ident = Binder.clearCallingIdentity(); 1057 UserInfo userInfo = null; 1058 try { 1059 synchronized (mInstallLock) { 1060 synchronized (mPackagesLock) { 1061 UserInfo parent = null; 1062 if (parentId != UserHandle.USER_NULL) { 1063 parent = getUserInfoLocked(parentId); 1064 if (parent == null) return null; 1065 } 1066 if (isUserLimitReachedLocked()) return null; 1067 int userId = getNextAvailableIdLocked(); 1068 userInfo = new UserInfo(userId, name, null, flags); 1069 File userPath = new File(mBaseUserPath, Integer.toString(userId)); 1070 userInfo.serialNumber = mNextSerialNumber++; 1071 long now = System.currentTimeMillis(); 1072 userInfo.creationTime = (now > EPOCH_PLUS_30_YEARS) ? now : 0; 1073 userInfo.partial = true; 1074 Environment.getUserSystemDirectory(userInfo.id).mkdirs(); 1075 mUsers.put(userId, userInfo); 1076 writeUserListLocked(); 1077 if (parent != null) { 1078 if (parent.profileGroupId == UserInfo.NO_PROFILE_GROUP_ID) { 1079 parent.profileGroupId = parent.id; 1080 writeUserLocked(parent); 1081 } 1082 userInfo.profileGroupId = parent.profileGroupId; 1083 } 1084 writeUserLocked(userInfo); 1085 mPm.createNewUserLILPw(userId, userPath); 1086 userInfo.partial = false; 1087 writeUserLocked(userInfo); 1088 updateUserIdsLocked(); 1089 Bundle restrictions = new Bundle(); 1090 mUserRestrictions.append(userId, restrictions); 1091 } 1092 } 1093 if (userInfo != null) { 1094 Intent addedIntent = new Intent(Intent.ACTION_USER_ADDED); 1095 addedIntent.putExtra(Intent.EXTRA_USER_HANDLE, userInfo.id); 1096 mContext.sendBroadcastAsUser(addedIntent, UserHandle.ALL, 1097 android.Manifest.permission.MANAGE_USERS); 1098 } 1099 } finally { 1100 Binder.restoreCallingIdentity(ident); 1101 } 1102 return userInfo; 1103 } 1104 1105 /** 1106 * Removes a user and all data directories created for that user. This method should be called 1107 * after the user's processes have been terminated. 1108 * @param userHandle the user's id 1109 */ 1110 public boolean removeUser(int userHandle) { 1111 checkManageUsersPermission("Only the system can remove users"); 1112 final UserInfo user; 1113 synchronized (mPackagesLock) { 1114 user = mUsers.get(userHandle); 1115 if (userHandle == 0 || user == null) { 1116 return false; 1117 } 1118 mRemovingUserIds.put(userHandle, true); 1119 // Set this to a partially created user, so that the user will be purged 1120 // on next startup, in case the runtime stops now before stopping and 1121 // removing the user completely. 1122 user.partial = true; 1123 // Mark it as disabled, so that it isn't returned any more when 1124 // profiles are queried. 1125 user.flags |= UserInfo.FLAG_DISABLED; 1126 writeUserLocked(user); 1127 } 1128 1129 if (user.profileGroupId != UserInfo.NO_PROFILE_GROUP_ID 1130 && user.isManagedProfile()) { 1131 // Send broadcast to notify system that the user removed was a 1132 // managed user. 1133 sendProfileRemovedBroadcast(user.profileGroupId, user.id); 1134 } 1135 1136 if (DBG) Slog.i(LOG_TAG, "Stopping user " + userHandle); 1137 int res; 1138 try { 1139 res = ActivityManagerNative.getDefault().stopUser(userHandle, 1140 new IStopUserCallback.Stub() { 1141 @Override 1142 public void userStopped(int userId) { 1143 finishRemoveUser(userId); 1144 } 1145 @Override 1146 public void userStopAborted(int userId) { 1147 } 1148 }); 1149 } catch (RemoteException e) { 1150 return false; 1151 } 1152 1153 return res == ActivityManager.USER_OP_SUCCESS; 1154 } 1155 1156 void finishRemoveUser(final int userHandle) { 1157 if (DBG) Slog.i(LOG_TAG, "finishRemoveUser " + userHandle); 1158 // Let other services shutdown any activity and clean up their state before completely 1159 // wiping the user's system directory and removing from the user list 1160 long ident = Binder.clearCallingIdentity(); 1161 try { 1162 Intent addedIntent = new Intent(Intent.ACTION_USER_REMOVED); 1163 addedIntent.putExtra(Intent.EXTRA_USER_HANDLE, userHandle); 1164 mContext.sendOrderedBroadcastAsUser(addedIntent, UserHandle.ALL, 1165 android.Manifest.permission.MANAGE_USERS, 1166 1167 new BroadcastReceiver() { 1168 @Override 1169 public void onReceive(Context context, Intent intent) { 1170 if (DBG) { 1171 Slog.i(LOG_TAG, 1172 "USER_REMOVED broadcast sent, cleaning up user data " 1173 + userHandle); 1174 } 1175 new Thread() { 1176 public void run() { 1177 synchronized (mInstallLock) { 1178 synchronized (mPackagesLock) { 1179 removeUserStateLocked(userHandle); 1180 } 1181 } 1182 } 1183 }.start(); 1184 } 1185 }, 1186 1187 null, Activity.RESULT_OK, null, null); 1188 } finally { 1189 Binder.restoreCallingIdentity(ident); 1190 } 1191 } 1192 1193 private void removeUserStateLocked(final int userHandle) { 1194 // Cleanup package manager settings 1195 mPm.cleanUpUserLILPw(userHandle); 1196 1197 // Remove this user from the list 1198 mUsers.remove(userHandle); 1199 1200 // Have user ID linger for several seconds to let external storage VFS 1201 // cache entries expire. This must be greater than the 'entry_valid' 1202 // timeout used by the FUSE daemon. 1203 mHandler.postDelayed(new Runnable() { 1204 @Override 1205 public void run() { 1206 synchronized (mPackagesLock) { 1207 mRemovingUserIds.delete(userHandle); 1208 } 1209 } 1210 }, MINUTE_IN_MILLIS); 1211 1212 mRestrictionsPinStates.remove(userHandle); 1213 // Remove user file 1214 AtomicFile userFile = new AtomicFile(new File(mUsersDir, userHandle + XML_SUFFIX)); 1215 userFile.delete(); 1216 // Update the user list 1217 writeUserListLocked(); 1218 updateUserIdsLocked(); 1219 removeDirectoryRecursive(Environment.getUserSystemDirectory(userHandle)); 1220 } 1221 1222 private void removeDirectoryRecursive(File parent) { 1223 if (parent.isDirectory()) { 1224 String[] files = parent.list(); 1225 for (String filename : files) { 1226 File child = new File(parent, filename); 1227 removeDirectoryRecursive(child); 1228 } 1229 } 1230 parent.delete(); 1231 } 1232 1233 private void sendProfileRemovedBroadcast(int parentUserId, int removedUserId) { 1234 Intent managedProfileIntent = new Intent(Intent.ACTION_MANAGED_PROFILE_REMOVED); 1235 managedProfileIntent.addFlags(Intent.FLAG_RECEIVER_FOREGROUND); 1236 managedProfileIntent.putExtra(Intent.EXTRA_USER, new UserHandle(removedUserId)); 1237 mContext.sendBroadcastAsUser(managedProfileIntent, new UserHandle(parentUserId), null); 1238 } 1239 1240 @Override 1241 public Bundle getApplicationRestrictions(String packageName) { 1242 return getApplicationRestrictionsForUser(packageName, UserHandle.getCallingUserId()); 1243 } 1244 1245 @Override 1246 public Bundle getApplicationRestrictionsForUser(String packageName, int userId) { 1247 if (UserHandle.getCallingUserId() != userId 1248 || !UserHandle.isSameApp(Binder.getCallingUid(), getUidForPackage(packageName))) { 1249 checkManageUsersPermission("Only system can get restrictions for other users/apps"); 1250 } 1251 synchronized (mPackagesLock) { 1252 // Read the restrictions from XML 1253 return readApplicationRestrictionsLocked(packageName, userId); 1254 } 1255 } 1256 1257 @Override 1258 public void setApplicationRestrictions(String packageName, Bundle restrictions, 1259 int userId) { 1260 if (UserHandle.getCallingUserId() != userId 1261 || !UserHandle.isSameApp(Binder.getCallingUid(), getUidForPackage(packageName))) { 1262 checkManageUsersPermission("Only system can set restrictions for other users/apps"); 1263 } 1264 synchronized (mPackagesLock) { 1265 // Write the restrictions to XML 1266 writeApplicationRestrictionsLocked(packageName, restrictions, userId); 1267 } 1268 1269 // Notify package of changes via an intent - only sent to explicitly registered receivers. 1270 Intent changeIntent = new Intent(Intent.ACTION_APPLICATION_RESTRICTIONS_CHANGED); 1271 changeIntent.setPackage(packageName); 1272 changeIntent.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY); 1273 mContext.sendBroadcastAsUser(changeIntent, new UserHandle(userId)); 1274 } 1275 1276 @Override 1277 public boolean setRestrictionsChallenge(String newPin) { 1278 checkManageUsersPermission("Only system can modify the restrictions pin"); 1279 int userId = UserHandle.getCallingUserId(); 1280 synchronized (mPackagesLock) { 1281 RestrictionsPinState pinState = mRestrictionsPinStates.get(userId); 1282 if (pinState == null) { 1283 pinState = new RestrictionsPinState(); 1284 } 1285 if (newPin == null) { 1286 pinState.salt = 0; 1287 pinState.pinHash = null; 1288 } else { 1289 try { 1290 pinState.salt = SecureRandom.getInstance("SHA1PRNG").nextLong(); 1291 } catch (NoSuchAlgorithmException e) { 1292 pinState.salt = (long) (Math.random() * Long.MAX_VALUE); 1293 } 1294 pinState.pinHash = passwordToHash(newPin, pinState.salt); 1295 pinState.failedAttempts = 0; 1296 } 1297 mRestrictionsPinStates.put(userId, pinState); 1298 writeUserLocked(mUsers.get(userId)); 1299 } 1300 return true; 1301 } 1302 1303 @Override 1304 public int checkRestrictionsChallenge(String pin) { 1305 checkManageUsersPermission("Only system can verify the restrictions pin"); 1306 int userId = UserHandle.getCallingUserId(); 1307 synchronized (mPackagesLock) { 1308 RestrictionsPinState pinState = mRestrictionsPinStates.get(userId); 1309 // If there's no pin set, return error code 1310 if (pinState == null || pinState.salt == 0 || pinState.pinHash == null) { 1311 return UserManager.PIN_VERIFICATION_FAILED_NOT_SET; 1312 } else if (pin == null) { 1313 // If just checking if user can be prompted, return remaining time 1314 int waitTime = getRemainingTimeForPinAttempt(pinState); 1315 Slog.d(LOG_TAG, "Remaining waittime peek=" + waitTime); 1316 return waitTime; 1317 } else { 1318 int waitTime = getRemainingTimeForPinAttempt(pinState); 1319 Slog.d(LOG_TAG, "Remaining waittime=" + waitTime); 1320 if (waitTime > 0) { 1321 return waitTime; 1322 } 1323 if (passwordToHash(pin, pinState.salt).equals(pinState.pinHash)) { 1324 pinState.failedAttempts = 0; 1325 writeUserLocked(mUsers.get(userId)); 1326 return UserManager.PIN_VERIFICATION_SUCCESS; 1327 } else { 1328 pinState.failedAttempts++; 1329 pinState.lastAttemptTime = System.currentTimeMillis(); 1330 writeUserLocked(mUsers.get(userId)); 1331 return waitTime; 1332 } 1333 } 1334 } 1335 } 1336 1337 private int getRemainingTimeForPinAttempt(RestrictionsPinState pinState) { 1338 int backoffIndex = Math.min(pinState.failedAttempts / BACKOFF_INC_INTERVAL, 1339 BACKOFF_TIMES.length - 1); 1340 int backoffTime = (pinState.failedAttempts % BACKOFF_INC_INTERVAL) == 0 ? 1341 BACKOFF_TIMES[backoffIndex] : 0; 1342 return (int) Math.max(backoffTime + pinState.lastAttemptTime - System.currentTimeMillis(), 1343 0); 1344 } 1345 1346 @Override 1347 public boolean hasRestrictionsChallenge() { 1348 int userId = UserHandle.getCallingUserId(); 1349 synchronized (mPackagesLock) { 1350 return hasRestrictionsPinLocked(userId); 1351 } 1352 } 1353 1354 private boolean hasRestrictionsPinLocked(int userId) { 1355 RestrictionsPinState pinState = mRestrictionsPinStates.get(userId); 1356 if (pinState == null || pinState.salt == 0 || pinState.pinHash == null) { 1357 return false; 1358 } 1359 return true; 1360 } 1361 1362 @Override 1363 public void removeRestrictions() { 1364 checkManageUsersPermission("Only system can remove restrictions"); 1365 final int userHandle = UserHandle.getCallingUserId(); 1366 removeRestrictionsForUser(userHandle, true); 1367 } 1368 1369 private void removeRestrictionsForUser(final int userHandle, boolean unblockApps) { 1370 synchronized (mPackagesLock) { 1371 // Remove all user restrictions 1372 setUserRestrictions(new Bundle(), userHandle); 1373 // Remove restrictions pin 1374 setRestrictionsChallenge(null); 1375 // Remove any app restrictions 1376 cleanAppRestrictions(userHandle, true); 1377 } 1378 if (unblockApps) { 1379 unblockAllAppsForUser(userHandle); 1380 } 1381 } 1382 1383 private void unblockAllAppsForUser(final int userHandle) { 1384 mHandler.post(new Runnable() { 1385 @Override 1386 public void run() { 1387 List<ApplicationInfo> apps = 1388 mPm.getInstalledApplications(PackageManager.GET_UNINSTALLED_PACKAGES, 1389 userHandle).getList(); 1390 final long ident = Binder.clearCallingIdentity(); 1391 try { 1392 for (ApplicationInfo appInfo : apps) { 1393 if ((appInfo.flags & ApplicationInfo.FLAG_INSTALLED) != 0 1394 && (appInfo.flags & ApplicationInfo.FLAG_BLOCKED) != 0) { 1395 mPm.setApplicationBlockedSettingAsUser(appInfo.packageName, false, 1396 userHandle); 1397 } 1398 } 1399 } finally { 1400 Binder.restoreCallingIdentity(ident); 1401 } 1402 } 1403 }); 1404 } 1405 1406 /* 1407 * Generate a hash for the given password. To avoid brute force attacks, we use a salted hash. 1408 * Not the most secure, but it is at least a second level of protection. First level is that 1409 * the file is in a location only readable by the system process. 1410 * @param password the password. 1411 * @param salt the randomly generated salt 1412 * @return the hash of the pattern in a String. 1413 */ 1414 private String passwordToHash(String password, long salt) { 1415 if (password == null) { 1416 return null; 1417 } 1418 String algo = null; 1419 String hashed = salt + password; 1420 try { 1421 byte[] saltedPassword = (password + salt).getBytes(); 1422 byte[] sha1 = MessageDigest.getInstance(algo = "SHA-1").digest(saltedPassword); 1423 byte[] md5 = MessageDigest.getInstance(algo = "MD5").digest(saltedPassword); 1424 hashed = toHex(sha1) + toHex(md5); 1425 } catch (NoSuchAlgorithmException e) { 1426 Log.w(LOG_TAG, "Failed to encode string because of missing algorithm: " + algo); 1427 } 1428 return hashed; 1429 } 1430 1431 private static String toHex(byte[] ary) { 1432 final String hex = "0123456789ABCDEF"; 1433 String ret = ""; 1434 for (int i = 0; i < ary.length; i++) { 1435 ret += hex.charAt((ary[i] >> 4) & 0xf); 1436 ret += hex.charAt(ary[i] & 0xf); 1437 } 1438 return ret; 1439 } 1440 1441 private int getUidForPackage(String packageName) { 1442 long ident = Binder.clearCallingIdentity(); 1443 try { 1444 return mContext.getPackageManager().getApplicationInfo(packageName, 1445 PackageManager.GET_UNINSTALLED_PACKAGES).uid; 1446 } catch (NameNotFoundException nnfe) { 1447 return -1; 1448 } finally { 1449 Binder.restoreCallingIdentity(ident); 1450 } 1451 } 1452 1453 private Bundle readApplicationRestrictionsLocked(String packageName, 1454 int userId) { 1455 final Bundle restrictions = new Bundle(); 1456 final ArrayList<String> values = new ArrayList<String>(); 1457 1458 FileInputStream fis = null; 1459 try { 1460 AtomicFile restrictionsFile = 1461 new AtomicFile(new File(Environment.getUserSystemDirectory(userId), 1462 packageToRestrictionsFileName(packageName))); 1463 fis = restrictionsFile.openRead(); 1464 XmlPullParser parser = Xml.newPullParser(); 1465 parser.setInput(fis, null); 1466 int type; 1467 while ((type = parser.next()) != XmlPullParser.START_TAG 1468 && type != XmlPullParser.END_DOCUMENT) { 1469 ; 1470 } 1471 1472 if (type != XmlPullParser.START_TAG) { 1473 Slog.e(LOG_TAG, "Unable to read restrictions file " 1474 + restrictionsFile.getBaseFile()); 1475 return restrictions; 1476 } 1477 1478 while ((type = parser.next()) != XmlPullParser.END_DOCUMENT) { 1479 if (type == XmlPullParser.START_TAG && parser.getName().equals(TAG_ENTRY)) { 1480 String key = parser.getAttributeValue(null, ATTR_KEY); 1481 String valType = parser.getAttributeValue(null, ATTR_VALUE_TYPE); 1482 String multiple = parser.getAttributeValue(null, ATTR_MULTIPLE); 1483 if (multiple != null) { 1484 int count = Integer.parseInt(multiple); 1485 while (count > 0 && (type = parser.next()) != XmlPullParser.END_DOCUMENT) { 1486 if (type == XmlPullParser.START_TAG 1487 && parser.getName().equals(TAG_VALUE)) { 1488 values.add(parser.nextText().trim()); 1489 count--; 1490 } 1491 } 1492 String [] valueStrings = new String[values.size()]; 1493 values.toArray(valueStrings); 1494 restrictions.putStringArray(key, valueStrings); 1495 } else if (ATTR_TYPE_BOOLEAN.equals(valType)) { 1496 restrictions.putBoolean(key, Boolean.parseBoolean( 1497 parser.nextText().trim())); 1498 } else { 1499 String value = parser.nextText().trim(); 1500 restrictions.putString(key, value); 1501 } 1502 } 1503 } 1504 1505 } catch (IOException ioe) { 1506 } catch (XmlPullParserException pe) { 1507 } finally { 1508 if (fis != null) { 1509 try { 1510 fis.close(); 1511 } catch (IOException e) { 1512 } 1513 } 1514 } 1515 return restrictions; 1516 } 1517 1518 private void writeApplicationRestrictionsLocked(String packageName, 1519 Bundle restrictions, int userId) { 1520 FileOutputStream fos = null; 1521 AtomicFile restrictionsFile = new AtomicFile( 1522 new File(Environment.getUserSystemDirectory(userId), 1523 packageToRestrictionsFileName(packageName))); 1524 try { 1525 fos = restrictionsFile.startWrite(); 1526 final BufferedOutputStream bos = new BufferedOutputStream(fos); 1527 1528 // XmlSerializer serializer = XmlUtils.serializerInstance(); 1529 final XmlSerializer serializer = new FastXmlSerializer(); 1530 serializer.setOutput(bos, "utf-8"); 1531 serializer.startDocument(null, true); 1532 serializer.setFeature("http://xmlpull.org/v1/doc/features.html#indent-output", true); 1533 1534 serializer.startTag(null, TAG_RESTRICTIONS); 1535 1536 for (String key : restrictions.keySet()) { 1537 Object value = restrictions.get(key); 1538 serializer.startTag(null, TAG_ENTRY); 1539 serializer.attribute(null, ATTR_KEY, key); 1540 1541 if (value instanceof Boolean) { 1542 serializer.attribute(null, ATTR_VALUE_TYPE, ATTR_TYPE_BOOLEAN); 1543 serializer.text(value.toString()); 1544 } else if (value == null || value instanceof String) { 1545 serializer.attribute(null, ATTR_VALUE_TYPE, ATTR_TYPE_STRING); 1546 serializer.text(value != null ? (String) value : ""); 1547 } else { 1548 serializer.attribute(null, ATTR_VALUE_TYPE, ATTR_TYPE_STRING_ARRAY); 1549 String[] values = (String[]) value; 1550 serializer.attribute(null, ATTR_MULTIPLE, Integer.toString(values.length)); 1551 for (String choice : values) { 1552 serializer.startTag(null, TAG_VALUE); 1553 serializer.text(choice != null ? choice : ""); 1554 serializer.endTag(null, TAG_VALUE); 1555 } 1556 } 1557 serializer.endTag(null, TAG_ENTRY); 1558 } 1559 1560 serializer.endTag(null, TAG_RESTRICTIONS); 1561 1562 serializer.endDocument(); 1563 restrictionsFile.finishWrite(fos); 1564 } catch (Exception e) { 1565 restrictionsFile.failWrite(fos); 1566 Slog.e(LOG_TAG, "Error writing application restrictions list"); 1567 } 1568 } 1569 1570 @Override 1571 public int getUserSerialNumber(int userHandle) { 1572 synchronized (mPackagesLock) { 1573 if (!exists(userHandle)) return -1; 1574 return getUserInfoLocked(userHandle).serialNumber; 1575 } 1576 } 1577 1578 @Override 1579 public int getUserHandle(int userSerialNumber) { 1580 synchronized (mPackagesLock) { 1581 for (int userId : mUserIds) { 1582 if (getUserInfoLocked(userId).serialNumber == userSerialNumber) return userId; 1583 } 1584 // Not found 1585 return -1; 1586 } 1587 } 1588 1589 /** 1590 * Caches the list of user ids in an array, adjusting the array size when necessary. 1591 */ 1592 private void updateUserIdsLocked() { 1593 int num = 0; 1594 for (int i = 0; i < mUsers.size(); i++) { 1595 if (!mUsers.valueAt(i).partial) { 1596 num++; 1597 } 1598 } 1599 final int[] newUsers = new int[num]; 1600 int n = 0; 1601 for (int i = 0; i < mUsers.size(); i++) { 1602 if (!mUsers.valueAt(i).partial) { 1603 newUsers[n++] = mUsers.keyAt(i); 1604 } 1605 } 1606 mUserIds = newUsers; 1607 } 1608 1609 /** 1610 * Make a note of the last started time of a user and do some cleanup. 1611 * @param userId the user that was just foregrounded 1612 */ 1613 public void userForeground(int userId) { 1614 synchronized (mPackagesLock) { 1615 UserInfo user = mUsers.get(userId); 1616 long now = System.currentTimeMillis(); 1617 if (user == null || user.partial) { 1618 Slog.w(LOG_TAG, "userForeground: unknown user #" + userId); 1619 return; 1620 } 1621 if (now > EPOCH_PLUS_30_YEARS) { 1622 user.lastLoggedInTime = now; 1623 writeUserLocked(user); 1624 } 1625 // If this is not a restricted profile and there is no restrictions pin, clean up 1626 // all restrictions files that might have been left behind, else clean up just the 1627 // ones with uninstalled packages 1628 RestrictionsPinState pinState = mRestrictionsPinStates.get(userId); 1629 final long salt = pinState == null ? 0 : pinState.salt; 1630 cleanAppRestrictions(userId, (!user.isRestricted() && salt == 0)); 1631 } 1632 } 1633 1634 /** 1635 * Returns the next available user id, filling in any holes in the ids. 1636 * TODO: May not be a good idea to recycle ids, in case it results in confusion 1637 * for data and battery stats collection, or unexpected cross-talk. 1638 * @return 1639 */ 1640 private int getNextAvailableIdLocked() { 1641 synchronized (mPackagesLock) { 1642 int i = MIN_USER_ID; 1643 while (i < Integer.MAX_VALUE) { 1644 if (mUsers.indexOfKey(i) < 0 && !mRemovingUserIds.get(i)) { 1645 break; 1646 } 1647 i++; 1648 } 1649 return i; 1650 } 1651 } 1652 1653 private String packageToRestrictionsFileName(String packageName) { 1654 return RESTRICTIONS_FILE_PREFIX + packageName + XML_SUFFIX; 1655 } 1656 1657 private String restrictionsFileNameToPackage(String fileName) { 1658 return fileName.substring(RESTRICTIONS_FILE_PREFIX.length(), 1659 (int) (fileName.length() - XML_SUFFIX.length())); 1660 } 1661 1662 @Override 1663 protected void dump(FileDescriptor fd, PrintWriter pw, String[] args) { 1664 if (mContext.checkCallingOrSelfPermission(android.Manifest.permission.DUMP) 1665 != PackageManager.PERMISSION_GRANTED) { 1666 pw.println("Permission Denial: can't dump UserManager from from pid=" 1667 + Binder.getCallingPid() 1668 + ", uid=" + Binder.getCallingUid() 1669 + " without permission " 1670 + android.Manifest.permission.DUMP); 1671 return; 1672 } 1673 1674 long now = System.currentTimeMillis(); 1675 StringBuilder sb = new StringBuilder(); 1676 synchronized (mPackagesLock) { 1677 pw.println("Users:"); 1678 for (int i = 0; i < mUsers.size(); i++) { 1679 UserInfo user = mUsers.valueAt(i); 1680 if (user == null) continue; 1681 pw.print(" "); pw.print(user); pw.print(" serialNo="); pw.print(user.serialNumber); 1682 if (mRemovingUserIds.get(mUsers.keyAt(i))) pw.print(" <removing> "); 1683 if (user.partial) pw.print(" <partial>"); 1684 pw.println(); 1685 pw.print(" Created: "); 1686 if (user.creationTime == 0) { 1687 pw.println("<unknown>"); 1688 } else { 1689 sb.setLength(0); 1690 TimeUtils.formatDuration(now - user.creationTime, sb); 1691 sb.append(" ago"); 1692 pw.println(sb); 1693 } 1694 pw.print(" Last logged in: "); 1695 if (user.lastLoggedInTime == 0) { 1696 pw.println("<unknown>"); 1697 } else { 1698 sb.setLength(0); 1699 TimeUtils.formatDuration(now - user.lastLoggedInTime, sb); 1700 sb.append(" ago"); 1701 pw.println(sb); 1702 } 1703 } 1704 } 1705 } 1706 1707 private PackageMonitor mUserPackageMonitor = new PackageMonitor() { 1708 @Override 1709 public void onPackageRemoved(String pkg, int uid) { 1710 final int userId = this.getChangingUserId(); 1711 // Package could be disappearing because it is being blocked, so also check if 1712 // it has been uninstalled. 1713 final boolean uninstalled = isPackageDisappearing(pkg) == PACKAGE_PERMANENT_CHANGE; 1714 if (uninstalled && userId >= 0 && !isPackageInstalled(pkg, userId)) { 1715 cleanAppRestrictionsForPackage(pkg, userId); 1716 } 1717 } 1718 }; 1719} 1720