UserManagerService.java revision a52dc3eb40777b055c0ca8d7885bd2c9577bcd1a
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_RELATED_GROUP_ID = "relatedGroupId"; 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 final Context context = ActivityThread.systemMain().getSystemContext(); 238 mUserPackageMonitor.register(context, 239 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> getRelatedUsers(int userId) { 263 checkManageUsersPermission("query users"); 264 synchronized (mPackagesLock) { 265 UserInfo user = getUserInfoLocked(userId); 266 ArrayList<UserInfo> users = new ArrayList<UserInfo>(mUsers.size()); 267 for (int i = 0; i < mUsers.size(); i++) { 268 UserInfo ui = mUsers.valueAt(i); 269 if (!areRelatedUsers(user, ui)) { 270 continue; 271 } 272 users.add(ui); 273 } 274 return users; 275 } 276 } 277 278 private boolean areRelatedUsers(UserInfo user1, UserInfo user2) { 279 return user1.relatedGroupId != UserInfo.NO_RELATED_GROUP_ID && 280 user1.relatedGroupId == user2.relatedGroupId && 281 user1.id != user2.id; 282 } 283 284 @Override 285 public UserInfo getUserInfo(int userId) { 286 checkManageUsersPermission("query user"); 287 synchronized (mPackagesLock) { 288 return getUserInfoLocked(userId); 289 } 290 } 291 292 @Override 293 public boolean isRestricted() { 294 synchronized (mPackagesLock) { 295 return getUserInfoLocked(UserHandle.getCallingUserId()).isRestricted(); 296 } 297 } 298 299 /* 300 * Should be locked on mUsers before calling this. 301 */ 302 private UserInfo getUserInfoLocked(int userId) { 303 UserInfo ui = mUsers.get(userId); 304 // If it is partial and not in the process of being removed, return as unknown user. 305 if (ui != null && ui.partial && !mRemovingUserIds.get(userId)) { 306 Slog.w(LOG_TAG, "getUserInfo: unknown user #" + userId); 307 return null; 308 } 309 return ui; 310 } 311 312 public boolean exists(int userId) { 313 synchronized (mPackagesLock) { 314 return ArrayUtils.contains(mUserIds, userId); 315 } 316 } 317 318 @Override 319 public void setUserName(int userId, String name) { 320 checkManageUsersPermission("rename users"); 321 boolean changed = false; 322 synchronized (mPackagesLock) { 323 UserInfo info = mUsers.get(userId); 324 if (info == null || info.partial) { 325 Slog.w(LOG_TAG, "setUserName: unknown user #" + userId); 326 return; 327 } 328 if (name != null && !name.equals(info.name)) { 329 info.name = name; 330 writeUserLocked(info); 331 changed = true; 332 } 333 } 334 if (changed) { 335 sendUserInfoChangedBroadcast(userId); 336 } 337 } 338 339 @Override 340 public void setUserIcon(int userId, Bitmap bitmap) { 341 checkManageUsersPermission("update users"); 342 synchronized (mPackagesLock) { 343 UserInfo info = mUsers.get(userId); 344 if (info == null || info.partial) { 345 Slog.w(LOG_TAG, "setUserIcon: unknown user #" + userId); 346 return; 347 } 348 writeBitmapLocked(info, bitmap); 349 writeUserLocked(info); 350 } 351 sendUserInfoChangedBroadcast(userId); 352 } 353 354 private void sendUserInfoChangedBroadcast(int userId) { 355 Intent changedIntent = new Intent(Intent.ACTION_USER_INFO_CHANGED); 356 changedIntent.putExtra(Intent.EXTRA_USER_HANDLE, userId); 357 changedIntent.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY); 358 mContext.sendBroadcastAsUser(changedIntent, UserHandle.ALL); 359 } 360 361 @Override 362 public Bitmap getUserIcon(int userId) { 363 checkManageUsersPermission("read users"); 364 synchronized (mPackagesLock) { 365 UserInfo info = mUsers.get(userId); 366 if (info == null || info.partial) { 367 Slog.w(LOG_TAG, "getUserIcon: unknown user #" + userId); 368 return null; 369 } 370 if (info.iconPath == null) { 371 return null; 372 } 373 return BitmapFactory.decodeFile(info.iconPath); 374 } 375 } 376 377 @Override 378 public void setGuestEnabled(boolean enable) { 379 checkManageUsersPermission("enable guest users"); 380 synchronized (mPackagesLock) { 381 if (mGuestEnabled != enable) { 382 mGuestEnabled = enable; 383 // Erase any guest user that currently exists 384 for (int i = 0; i < mUsers.size(); i++) { 385 UserInfo user = mUsers.valueAt(i); 386 if (!user.partial && user.isGuest()) { 387 if (!enable) { 388 removeUser(user.id); 389 } 390 return; 391 } 392 } 393 // No guest was found 394 if (enable) { 395 createUser("Guest", UserInfo.FLAG_GUEST); 396 } 397 } 398 } 399 } 400 401 @Override 402 public boolean isGuestEnabled() { 403 synchronized (mPackagesLock) { 404 return mGuestEnabled; 405 } 406 } 407 408 @Override 409 public void wipeUser(int userHandle) { 410 checkManageUsersPermission("wipe user"); 411 // TODO: 412 } 413 414 public void makeInitialized(int userId) { 415 checkManageUsersPermission("makeInitialized"); 416 synchronized (mPackagesLock) { 417 UserInfo info = mUsers.get(userId); 418 if (info == null || info.partial) { 419 Slog.w(LOG_TAG, "makeInitialized: unknown user #" + userId); 420 } 421 if ((info.flags&UserInfo.FLAG_INITIALIZED) == 0) { 422 info.flags |= UserInfo.FLAG_INITIALIZED; 423 writeUserLocked(info); 424 } 425 } 426 } 427 428 @Override 429 public Bundle getUserRestrictions(int userId) { 430 // checkManageUsersPermission("getUserRestrictions"); 431 432 synchronized (mPackagesLock) { 433 Bundle restrictions = mUserRestrictions.get(userId); 434 return restrictions != null ? restrictions : Bundle.EMPTY; 435 } 436 } 437 438 @Override 439 public void setUserRestrictions(Bundle restrictions, int userId) { 440 checkManageUsersPermission("setUserRestrictions"); 441 if (restrictions == null) return; 442 443 synchronized (mPackagesLock) { 444 mUserRestrictions.get(userId).clear(); 445 mUserRestrictions.get(userId).putAll(restrictions); 446 writeUserLocked(mUsers.get(userId)); 447 } 448 } 449 450 /** 451 * Check if we've hit the limit of how many users can be created. 452 */ 453 private boolean isUserLimitReachedLocked() { 454 int nUsers = mUsers.size(); 455 return nUsers >= UserManager.getMaxSupportedUsers(); 456 } 457 458 /** 459 * Enforces that only the system UID or root's UID or apps that have the 460 * {@link android.Manifest.permission.MANAGE_USERS MANAGE_USERS} 461 * permission can make certain calls to the UserManager. 462 * 463 * @param message used as message if SecurityException is thrown 464 * @throws SecurityException if the caller is not system or root 465 */ 466 private static final void checkManageUsersPermission(String message) { 467 final int uid = Binder.getCallingUid(); 468 if (uid != Process.SYSTEM_UID && uid != 0 469 && ActivityManager.checkComponentPermission( 470 android.Manifest.permission.MANAGE_USERS, 471 uid, -1, true) != PackageManager.PERMISSION_GRANTED) { 472 throw new SecurityException("You need MANAGE_USERS permission to: " + message); 473 } 474 } 475 476 private void writeBitmapLocked(UserInfo info, Bitmap bitmap) { 477 try { 478 File dir = new File(mUsersDir, Integer.toString(info.id)); 479 File file = new File(dir, USER_PHOTO_FILENAME); 480 if (!dir.exists()) { 481 dir.mkdir(); 482 FileUtils.setPermissions( 483 dir.getPath(), 484 FileUtils.S_IRWXU|FileUtils.S_IRWXG|FileUtils.S_IXOTH, 485 -1, -1); 486 } 487 FileOutputStream os; 488 if (bitmap.compress(Bitmap.CompressFormat.PNG, 100, os = new FileOutputStream(file))) { 489 info.iconPath = file.getAbsolutePath(); 490 } 491 try { 492 os.close(); 493 } catch (IOException ioe) { 494 // What the ... ! 495 } 496 } catch (FileNotFoundException e) { 497 Slog.w(LOG_TAG, "Error setting photo for user ", e); 498 } 499 } 500 501 /** 502 * Returns an array of user ids. This array is cached here for quick access, so do not modify or 503 * cache it elsewhere. 504 * @return the array of user ids. 505 */ 506 public int[] getUserIds() { 507 synchronized (mPackagesLock) { 508 return mUserIds; 509 } 510 } 511 512 int[] getUserIdsLPr() { 513 return mUserIds; 514 } 515 516 private void readUserListLocked() { 517 mGuestEnabled = false; 518 if (!mUserListFile.exists()) { 519 fallbackToSingleUserLocked(); 520 return; 521 } 522 FileInputStream fis = null; 523 AtomicFile userListFile = new AtomicFile(mUserListFile); 524 try { 525 fis = userListFile.openRead(); 526 XmlPullParser parser = Xml.newPullParser(); 527 parser.setInput(fis, null); 528 int type; 529 while ((type = parser.next()) != XmlPullParser.START_TAG 530 && type != XmlPullParser.END_DOCUMENT) { 531 ; 532 } 533 534 if (type != XmlPullParser.START_TAG) { 535 Slog.e(LOG_TAG, "Unable to read user list"); 536 fallbackToSingleUserLocked(); 537 return; 538 } 539 540 mNextSerialNumber = -1; 541 if (parser.getName().equals(TAG_USERS)) { 542 String lastSerialNumber = parser.getAttributeValue(null, ATTR_NEXT_SERIAL_NO); 543 if (lastSerialNumber != null) { 544 mNextSerialNumber = Integer.parseInt(lastSerialNumber); 545 } 546 String versionNumber = parser.getAttributeValue(null, ATTR_USER_VERSION); 547 if (versionNumber != null) { 548 mUserVersion = Integer.parseInt(versionNumber); 549 } 550 } 551 552 while ((type = parser.next()) != XmlPullParser.END_DOCUMENT) { 553 if (type == XmlPullParser.START_TAG && parser.getName().equals(TAG_USER)) { 554 String id = parser.getAttributeValue(null, ATTR_ID); 555 UserInfo user = readUserLocked(Integer.parseInt(id)); 556 557 if (user != null) { 558 mUsers.put(user.id, user); 559 if (user.isGuest()) { 560 mGuestEnabled = true; 561 } 562 if (mNextSerialNumber < 0 || mNextSerialNumber <= user.id) { 563 mNextSerialNumber = user.id + 1; 564 } 565 } 566 } 567 } 568 updateUserIdsLocked(); 569 upgradeIfNecessaryLocked(); 570 } catch (IOException ioe) { 571 fallbackToSingleUserLocked(); 572 } catch (XmlPullParserException pe) { 573 fallbackToSingleUserLocked(); 574 } finally { 575 if (fis != null) { 576 try { 577 fis.close(); 578 } catch (IOException e) { 579 } 580 } 581 } 582 } 583 584 /** 585 * Upgrade steps between versions, either for fixing bugs or changing the data format. 586 */ 587 private void upgradeIfNecessaryLocked() { 588 int userVersion = mUserVersion; 589 if (userVersion < 1) { 590 // Assign a proper name for the owner, if not initialized correctly before 591 UserInfo user = mUsers.get(UserHandle.USER_OWNER); 592 if ("Primary".equals(user.name)) { 593 user.name = mContext.getResources().getString(com.android.internal.R.string.owner_name); 594 writeUserLocked(user); 595 } 596 userVersion = 1; 597 } 598 599 if (userVersion < 2) { 600 // Owner should be marked as initialized 601 UserInfo user = mUsers.get(UserHandle.USER_OWNER); 602 if ((user.flags & UserInfo.FLAG_INITIALIZED) == 0) { 603 user.flags |= UserInfo.FLAG_INITIALIZED; 604 writeUserLocked(user); 605 } 606 userVersion = 2; 607 } 608 609 610 if (userVersion < 4) { 611 userVersion = 4; 612 } 613 614 if (userVersion < USER_VERSION) { 615 Slog.w(LOG_TAG, "User version " + mUserVersion + " didn't upgrade as expected to " 616 + USER_VERSION); 617 } else { 618 mUserVersion = userVersion; 619 writeUserListLocked(); 620 } 621 } 622 623 private void fallbackToSingleUserLocked() { 624 // Create the primary user 625 UserInfo primary = new UserInfo(UserHandle.USER_OWNER, 626 mContext.getResources().getString(com.android.internal.R.string.owner_name), null, 627 UserInfo.FLAG_ADMIN | UserInfo.FLAG_PRIMARY | UserInfo.FLAG_INITIALIZED); 628 mUsers.put(0, primary); 629 mNextSerialNumber = MIN_USER_ID; 630 mUserVersion = USER_VERSION; 631 632 Bundle restrictions = new Bundle(); 633 mUserRestrictions.append(UserHandle.USER_OWNER, restrictions); 634 635 updateUserIdsLocked(); 636 637 writeUserListLocked(); 638 writeUserLocked(primary); 639 } 640 641 /* 642 * Writes the user file in this format: 643 * 644 * <user flags="20039023" id="0"> 645 * <name>Primary</name> 646 * </user> 647 */ 648 private void writeUserLocked(UserInfo userInfo) { 649 FileOutputStream fos = null; 650 AtomicFile userFile = new AtomicFile(new File(mUsersDir, userInfo.id + XML_SUFFIX)); 651 try { 652 fos = userFile.startWrite(); 653 final BufferedOutputStream bos = new BufferedOutputStream(fos); 654 655 // XmlSerializer serializer = XmlUtils.serializerInstance(); 656 final XmlSerializer serializer = new FastXmlSerializer(); 657 serializer.setOutput(bos, "utf-8"); 658 serializer.startDocument(null, true); 659 serializer.setFeature("http://xmlpull.org/v1/doc/features.html#indent-output", true); 660 661 serializer.startTag(null, TAG_USER); 662 serializer.attribute(null, ATTR_ID, Integer.toString(userInfo.id)); 663 serializer.attribute(null, ATTR_SERIAL_NO, Integer.toString(userInfo.serialNumber)); 664 serializer.attribute(null, ATTR_FLAGS, Integer.toString(userInfo.flags)); 665 serializer.attribute(null, ATTR_CREATION_TIME, Long.toString(userInfo.creationTime)); 666 serializer.attribute(null, ATTR_LAST_LOGGED_IN_TIME, 667 Long.toString(userInfo.lastLoggedInTime)); 668 RestrictionsPinState pinState = mRestrictionsPinStates.get(userInfo.id); 669 if (pinState != null) { 670 if (pinState.salt != 0) { 671 serializer.attribute(null, ATTR_SALT, Long.toString(pinState.salt)); 672 } 673 if (pinState.pinHash != null) { 674 serializer.attribute(null, ATTR_PIN_HASH, pinState.pinHash); 675 } 676 if (pinState.failedAttempts != 0) { 677 serializer.attribute(null, ATTR_FAILED_ATTEMPTS, 678 Integer.toString(pinState.failedAttempts)); 679 serializer.attribute(null, ATTR_LAST_RETRY_MS, 680 Long.toString(pinState.lastAttemptTime)); 681 } 682 } 683 if (userInfo.iconPath != null) { 684 serializer.attribute(null, ATTR_ICON_PATH, userInfo.iconPath); 685 } 686 if (userInfo.partial) { 687 serializer.attribute(null, ATTR_PARTIAL, "true"); 688 } 689 if (userInfo.relatedGroupId != UserInfo.NO_RELATED_GROUP_ID) { 690 serializer.attribute(null, ATTR_RELATED_GROUP_ID, 691 Integer.toString(userInfo.relatedGroupId)); 692 } 693 694 serializer.startTag(null, TAG_NAME); 695 serializer.text(userInfo.name); 696 serializer.endTag(null, TAG_NAME); 697 698 Bundle restrictions = mUserRestrictions.get(userInfo.id); 699 if (restrictions != null) { 700 serializer.startTag(null, TAG_RESTRICTIONS); 701 writeBoolean(serializer, restrictions, UserManager.DISALLOW_CONFIG_WIFI); 702 writeBoolean(serializer, restrictions, UserManager.DISALLOW_MODIFY_ACCOUNTS); 703 writeBoolean(serializer, restrictions, UserManager.DISALLOW_INSTALL_APPS); 704 writeBoolean(serializer, restrictions, UserManager.DISALLOW_UNINSTALL_APPS); 705 writeBoolean(serializer, restrictions, UserManager.DISALLOW_SHARE_LOCATION); 706 writeBoolean(serializer, restrictions, 707 UserManager.DISALLOW_INSTALL_UNKNOWN_SOURCES); 708 writeBoolean(serializer, restrictions, UserManager.DISALLOW_CONFIG_BLUETOOTH); 709 writeBoolean(serializer, restrictions, UserManager.DISALLOW_USB_FILE_TRANSFER); 710 writeBoolean(serializer, restrictions, UserManager.DISALLOW_CONFIG_CREDENTIALS); 711 writeBoolean(serializer, restrictions, UserManager.DISALLOW_REMOVE_USER); 712 serializer.endTag(null, TAG_RESTRICTIONS); 713 } 714 serializer.endTag(null, TAG_USER); 715 716 serializer.endDocument(); 717 userFile.finishWrite(fos); 718 } catch (Exception ioe) { 719 Slog.e(LOG_TAG, "Error writing user info " + userInfo.id + "\n" + ioe); 720 userFile.failWrite(fos); 721 } 722 } 723 724 /* 725 * Writes the user list file in this format: 726 * 727 * <users nextSerialNumber="3"> 728 * <user id="0"></user> 729 * <user id="2"></user> 730 * </users> 731 */ 732 private void writeUserListLocked() { 733 FileOutputStream fos = null; 734 AtomicFile userListFile = new AtomicFile(mUserListFile); 735 try { 736 fos = userListFile.startWrite(); 737 final BufferedOutputStream bos = new BufferedOutputStream(fos); 738 739 // XmlSerializer serializer = XmlUtils.serializerInstance(); 740 final XmlSerializer serializer = new FastXmlSerializer(); 741 serializer.setOutput(bos, "utf-8"); 742 serializer.startDocument(null, true); 743 serializer.setFeature("http://xmlpull.org/v1/doc/features.html#indent-output", true); 744 745 serializer.startTag(null, TAG_USERS); 746 serializer.attribute(null, ATTR_NEXT_SERIAL_NO, Integer.toString(mNextSerialNumber)); 747 serializer.attribute(null, ATTR_USER_VERSION, Integer.toString(mUserVersion)); 748 749 for (int i = 0; i < mUsers.size(); i++) { 750 UserInfo user = mUsers.valueAt(i); 751 serializer.startTag(null, TAG_USER); 752 serializer.attribute(null, ATTR_ID, Integer.toString(user.id)); 753 serializer.endTag(null, TAG_USER); 754 } 755 756 serializer.endTag(null, TAG_USERS); 757 758 serializer.endDocument(); 759 userListFile.finishWrite(fos); 760 } catch (Exception e) { 761 userListFile.failWrite(fos); 762 Slog.e(LOG_TAG, "Error writing user list"); 763 } 764 } 765 766 private UserInfo readUserLocked(int id) { 767 int flags = 0; 768 int serialNumber = id; 769 String name = null; 770 String iconPath = null; 771 long creationTime = 0L; 772 long lastLoggedInTime = 0L; 773 long salt = 0L; 774 String pinHash = null; 775 int failedAttempts = 0; 776 int relatedGroupId = UserInfo.NO_RELATED_GROUP_ID; 777 long lastAttemptTime = 0L; 778 boolean partial = false; 779 Bundle restrictions = new Bundle(); 780 781 FileInputStream fis = null; 782 try { 783 AtomicFile userFile = 784 new AtomicFile(new File(mUsersDir, Integer.toString(id) + XML_SUFFIX)); 785 fis = userFile.openRead(); 786 XmlPullParser parser = Xml.newPullParser(); 787 parser.setInput(fis, null); 788 int type; 789 while ((type = parser.next()) != XmlPullParser.START_TAG 790 && type != XmlPullParser.END_DOCUMENT) { 791 ; 792 } 793 794 if (type != XmlPullParser.START_TAG) { 795 Slog.e(LOG_TAG, "Unable to read user " + id); 796 return null; 797 } 798 799 if (type == XmlPullParser.START_TAG && parser.getName().equals(TAG_USER)) { 800 int storedId = readIntAttribute(parser, ATTR_ID, -1); 801 if (storedId != id) { 802 Slog.e(LOG_TAG, "User id does not match the file name"); 803 return null; 804 } 805 serialNumber = readIntAttribute(parser, ATTR_SERIAL_NO, id); 806 flags = readIntAttribute(parser, ATTR_FLAGS, 0); 807 iconPath = parser.getAttributeValue(null, ATTR_ICON_PATH); 808 creationTime = readLongAttribute(parser, ATTR_CREATION_TIME, 0); 809 lastLoggedInTime = readLongAttribute(parser, ATTR_LAST_LOGGED_IN_TIME, 0); 810 salt = readLongAttribute(parser, ATTR_SALT, 0L); 811 pinHash = parser.getAttributeValue(null, ATTR_PIN_HASH); 812 failedAttempts = readIntAttribute(parser, ATTR_FAILED_ATTEMPTS, 0); 813 lastAttemptTime = readLongAttribute(parser, ATTR_LAST_RETRY_MS, 0L); 814 relatedGroupId = readIntAttribute(parser, ATTR_RELATED_GROUP_ID, 815 UserInfo.NO_RELATED_GROUP_ID); 816 String valueString = parser.getAttributeValue(null, ATTR_PARTIAL); 817 if ("true".equals(valueString)) { 818 partial = true; 819 } 820 821 int outerDepth = parser.getDepth(); 822 while ((type = parser.next()) != XmlPullParser.END_DOCUMENT 823 && (type != XmlPullParser.END_TAG || parser.getDepth() > outerDepth)) { 824 if (type == XmlPullParser.END_TAG || type == XmlPullParser.TEXT) { 825 continue; 826 } 827 String tag = parser.getName(); 828 if (TAG_NAME.equals(tag)) { 829 type = parser.next(); 830 if (type == XmlPullParser.TEXT) { 831 name = parser.getText(); 832 } 833 } else if (TAG_RESTRICTIONS.equals(tag)) { 834 readBoolean(parser, restrictions, UserManager.DISALLOW_CONFIG_WIFI); 835 readBoolean(parser, restrictions, UserManager.DISALLOW_MODIFY_ACCOUNTS); 836 readBoolean(parser, restrictions, UserManager.DISALLOW_INSTALL_APPS); 837 readBoolean(parser, restrictions, UserManager.DISALLOW_UNINSTALL_APPS); 838 readBoolean(parser, restrictions, UserManager.DISALLOW_SHARE_LOCATION); 839 readBoolean(parser, restrictions, 840 UserManager.DISALLOW_INSTALL_UNKNOWN_SOURCES); 841 readBoolean(parser, restrictions, UserManager.DISALLOW_CONFIG_BLUETOOTH); 842 readBoolean(parser, restrictions, UserManager.DISALLOW_USB_FILE_TRANSFER); 843 readBoolean(parser, restrictions, UserManager.DISALLOW_CONFIG_CREDENTIALS); 844 readBoolean(parser, restrictions, UserManager.DISALLOW_REMOVE_USER); 845 } 846 } 847 } 848 849 UserInfo userInfo = new UserInfo(id, name, iconPath, flags); 850 userInfo.serialNumber = serialNumber; 851 userInfo.creationTime = creationTime; 852 userInfo.lastLoggedInTime = lastLoggedInTime; 853 userInfo.partial = partial; 854 userInfo.relatedGroupId = relatedGroupId; 855 mUserRestrictions.append(id, restrictions); 856 if (salt != 0L) { 857 RestrictionsPinState pinState = mRestrictionsPinStates.get(id); 858 if (pinState == null) { 859 pinState = new RestrictionsPinState(); 860 mRestrictionsPinStates.put(id, pinState); 861 } 862 pinState.salt = salt; 863 pinState.pinHash = pinHash; 864 pinState.failedAttempts = failedAttempts; 865 pinState.lastAttemptTime = lastAttemptTime; 866 } 867 return userInfo; 868 869 } catch (IOException ioe) { 870 } catch (XmlPullParserException pe) { 871 } finally { 872 if (fis != null) { 873 try { 874 fis.close(); 875 } catch (IOException e) { 876 } 877 } 878 } 879 return null; 880 } 881 882 private void readBoolean(XmlPullParser parser, Bundle restrictions, 883 String restrictionKey) { 884 String value = parser.getAttributeValue(null, restrictionKey); 885 if (value != null) { 886 restrictions.putBoolean(restrictionKey, Boolean.parseBoolean(value)); 887 } 888 } 889 890 private void writeBoolean(XmlSerializer xml, Bundle restrictions, String restrictionKey) 891 throws IOException { 892 if (restrictions.containsKey(restrictionKey)) { 893 xml.attribute(null, restrictionKey, 894 Boolean.toString(restrictions.getBoolean(restrictionKey))); 895 } 896 } 897 898 private int readIntAttribute(XmlPullParser parser, String attr, int defaultValue) { 899 String valueString = parser.getAttributeValue(null, attr); 900 if (valueString == null) return defaultValue; 901 try { 902 return Integer.parseInt(valueString); 903 } catch (NumberFormatException nfe) { 904 return defaultValue; 905 } 906 } 907 908 private long readLongAttribute(XmlPullParser parser, String attr, long defaultValue) { 909 String valueString = parser.getAttributeValue(null, attr); 910 if (valueString == null) return defaultValue; 911 try { 912 return Long.parseLong(valueString); 913 } catch (NumberFormatException nfe) { 914 return defaultValue; 915 } 916 } 917 918 private boolean isPackageInstalled(String pkg, int userId) { 919 final ApplicationInfo info = mPm.getApplicationInfo(pkg, 920 PackageManager.GET_UNINSTALLED_PACKAGES, 921 userId); 922 if (info == null || (info.flags&ApplicationInfo.FLAG_INSTALLED) == 0) { 923 return false; 924 } 925 return true; 926 } 927 928 /** 929 * Removes all the restrictions files (res_<packagename>) for a given user, if all is true, 930 * else removes only those packages that have been uninstalled. 931 * Does not do any permissions checking. 932 */ 933 private void cleanAppRestrictions(int userId, boolean all) { 934 synchronized (mPackagesLock) { 935 File dir = Environment.getUserSystemDirectory(userId); 936 String[] files = dir.list(); 937 if (files == null) return; 938 for (String fileName : files) { 939 if (fileName.startsWith(RESTRICTIONS_FILE_PREFIX)) { 940 File resFile = new File(dir, fileName); 941 if (resFile.exists()) { 942 if (all) { 943 resFile.delete(); 944 } else { 945 String pkg = restrictionsFileNameToPackage(fileName); 946 if (!isPackageInstalled(pkg, userId)) { 947 resFile.delete(); 948 } 949 } 950 } 951 } 952 } 953 } 954 } 955 956 /** 957 * Removes the app restrictions file for a specific package and user id, if it exists. 958 */ 959 private void cleanAppRestrictionsForPackage(String pkg, int userId) { 960 synchronized (mPackagesLock) { 961 File dir = Environment.getUserSystemDirectory(userId); 962 File resFile = new File(dir, packageToRestrictionsFileName(pkg)); 963 if (resFile.exists()) { 964 resFile.delete(); 965 } 966 } 967 } 968 969 private int getNextRelatedGroupIdLocked() { 970 int maxGroupId = UserInfo.NO_RELATED_GROUP_ID; 971 for (int i = 0; i < mUsers.size(); i++) { 972 UserInfo ui = mUsers.valueAt(i); 973 if (maxGroupId < ui.relatedGroupId) { 974 maxGroupId = ui.relatedGroupId; 975 } 976 } 977 return maxGroupId + 1; 978 } 979 980 @Override 981 public UserInfo createRelatedUser(String name, int flags, int relatedUserId) { 982 checkManageUsersPermission("Only the system can create users"); 983 if (relatedUserId != UserHandle.USER_OWNER) { 984 Slog.w(LOG_TAG, "Only user owner can have related users"); 985 return null; 986 } 987 synchronized (mPackagesLock) { 988 UserInfo relatedUser = getUserInfoLocked(relatedUserId); 989 if (relatedUser == null) { 990 return null; 991 } 992 return createUserInternal(name, flags, relatedUser); 993 } 994 } 995 996 @Override 997 public UserInfo createUser(String name, int flags) { 998 checkManageUsersPermission("Only the system can create users"); 999 return createUserInternal(name, flags, null); 1000 } 1001 1002 private UserInfo createUserInternal(String name, int flags, UserInfo relatedUser) { 1003 final long ident = Binder.clearCallingIdentity(); 1004 final UserInfo userInfo; 1005 try { 1006 synchronized (mInstallLock) { 1007 synchronized (mPackagesLock) { 1008 if (isUserLimitReachedLocked()) return null; 1009 int userId = getNextAvailableIdLocked(); 1010 userInfo = new UserInfo(userId, name, null, flags); 1011 File userPath = new File(mBaseUserPath, Integer.toString(userId)); 1012 userInfo.serialNumber = mNextSerialNumber++; 1013 long now = System.currentTimeMillis(); 1014 userInfo.creationTime = (now > EPOCH_PLUS_30_YEARS) ? now : 0; 1015 userInfo.partial = true; 1016 Environment.getUserSystemDirectory(userInfo.id).mkdirs(); 1017 mUsers.put(userId, userInfo); 1018 writeUserListLocked(); 1019 if (relatedUser != null) { 1020 if (relatedUser.relatedGroupId == UserInfo.NO_RELATED_GROUP_ID) { 1021 relatedUser.relatedGroupId = getNextRelatedGroupIdLocked(); 1022 } 1023 userInfo.relatedGroupId = relatedUser.relatedGroupId; 1024 writeUserLocked(relatedUser); 1025 } 1026 writeUserLocked(userInfo); 1027 mPm.createNewUserLILPw(userId, userPath); 1028 userInfo.partial = false; 1029 writeUserLocked(userInfo); 1030 updateUserIdsLocked(); 1031 Bundle restrictions = new Bundle(); 1032 mUserRestrictions.append(userId, restrictions); 1033 } 1034 } 1035 if (userInfo != null) { 1036 Intent addedIntent = new Intent(Intent.ACTION_USER_ADDED); 1037 addedIntent.putExtra(Intent.EXTRA_USER_HANDLE, userInfo.id); 1038 mContext.sendBroadcastAsUser(addedIntent, UserHandle.ALL, 1039 android.Manifest.permission.MANAGE_USERS); 1040 } 1041 } finally { 1042 Binder.restoreCallingIdentity(ident); 1043 } 1044 return userInfo; 1045 } 1046 1047 /** 1048 * Removes a user and all data directories created for that user. This method should be called 1049 * after the user's processes have been terminated. 1050 * @param id the user's id 1051 */ 1052 public boolean removeUser(int userHandle) { 1053 checkManageUsersPermission("Only the system can remove users"); 1054 final UserInfo user; 1055 synchronized (mPackagesLock) { 1056 user = mUsers.get(userHandle); 1057 if (userHandle == 0 || user == null) { 1058 return false; 1059 } 1060 mRemovingUserIds.put(userHandle, true); 1061 // Set this to a partially created user, so that the user will be purged 1062 // on next startup, in case the runtime stops now before stopping and 1063 // removing the user completely. 1064 user.partial = true; 1065 writeUserLocked(user); 1066 } 1067 if (DBG) Slog.i(LOG_TAG, "Stopping user " + userHandle); 1068 int res; 1069 try { 1070 res = ActivityManagerNative.getDefault().stopUser(userHandle, 1071 new IStopUserCallback.Stub() { 1072 @Override 1073 public void userStopped(int userId) { 1074 finishRemoveUser(userId); 1075 } 1076 @Override 1077 public void userStopAborted(int userId) { 1078 } 1079 }); 1080 } catch (RemoteException e) { 1081 return false; 1082 } 1083 1084 return res == ActivityManager.USER_OP_SUCCESS; 1085 } 1086 1087 void finishRemoveUser(final int userHandle) { 1088 if (DBG) Slog.i(LOG_TAG, "finishRemoveUser " + userHandle); 1089 // Let other services shutdown any activity and clean up their state before completely 1090 // wiping the user's system directory and removing from the user list 1091 long ident = Binder.clearCallingIdentity(); 1092 try { 1093 Intent addedIntent = new Intent(Intent.ACTION_USER_REMOVED); 1094 addedIntent.putExtra(Intent.EXTRA_USER_HANDLE, userHandle); 1095 mContext.sendOrderedBroadcastAsUser(addedIntent, UserHandle.ALL, 1096 android.Manifest.permission.MANAGE_USERS, 1097 1098 new BroadcastReceiver() { 1099 @Override 1100 public void onReceive(Context context, Intent intent) { 1101 if (DBG) { 1102 Slog.i(LOG_TAG, 1103 "USER_REMOVED broadcast sent, cleaning up user data " 1104 + userHandle); 1105 } 1106 new Thread() { 1107 public void run() { 1108 synchronized (mInstallLock) { 1109 synchronized (mPackagesLock) { 1110 removeUserStateLocked(userHandle); 1111 } 1112 } 1113 } 1114 }.start(); 1115 } 1116 }, 1117 1118 null, Activity.RESULT_OK, null, null); 1119 } finally { 1120 Binder.restoreCallingIdentity(ident); 1121 } 1122 } 1123 1124 private void removeUserStateLocked(final int userHandle) { 1125 // Cleanup package manager settings 1126 mPm.cleanUpUserLILPw(userHandle); 1127 1128 // Remove this user from the list 1129 mUsers.remove(userHandle); 1130 1131 // Have user ID linger for several seconds to let external storage VFS 1132 // cache entries expire. This must be greater than the 'entry_valid' 1133 // timeout used by the FUSE daemon. 1134 mHandler.postDelayed(new Runnable() { 1135 @Override 1136 public void run() { 1137 synchronized (mPackagesLock) { 1138 mRemovingUserIds.delete(userHandle); 1139 } 1140 } 1141 }, MINUTE_IN_MILLIS); 1142 1143 mRestrictionsPinStates.remove(userHandle); 1144 // Remove user file 1145 AtomicFile userFile = new AtomicFile(new File(mUsersDir, userHandle + XML_SUFFIX)); 1146 userFile.delete(); 1147 // Update the user list 1148 writeUserListLocked(); 1149 updateUserIdsLocked(); 1150 removeDirectoryRecursive(Environment.getUserSystemDirectory(userHandle)); 1151 } 1152 1153 private void removeDirectoryRecursive(File parent) { 1154 if (parent.isDirectory()) { 1155 String[] files = parent.list(); 1156 for (String filename : files) { 1157 File child = new File(parent, filename); 1158 removeDirectoryRecursive(child); 1159 } 1160 } 1161 parent.delete(); 1162 } 1163 1164 @Override 1165 public Bundle getApplicationRestrictions(String packageName) { 1166 return getApplicationRestrictionsForUser(packageName, UserHandle.getCallingUserId()); 1167 } 1168 1169 @Override 1170 public Bundle getApplicationRestrictionsForUser(String packageName, int userId) { 1171 if (UserHandle.getCallingUserId() != userId 1172 || !UserHandle.isSameApp(Binder.getCallingUid(), getUidForPackage(packageName))) { 1173 checkManageUsersPermission("Only system can get restrictions for other users/apps"); 1174 } 1175 synchronized (mPackagesLock) { 1176 // Read the restrictions from XML 1177 return readApplicationRestrictionsLocked(packageName, userId); 1178 } 1179 } 1180 1181 @Override 1182 public void setApplicationRestrictions(String packageName, Bundle restrictions, 1183 int userId) { 1184 if (UserHandle.getCallingUserId() != userId 1185 || !UserHandle.isSameApp(Binder.getCallingUid(), getUidForPackage(packageName))) { 1186 checkManageUsersPermission("Only system can set restrictions for other users/apps"); 1187 } 1188 synchronized (mPackagesLock) { 1189 // Write the restrictions to XML 1190 writeApplicationRestrictionsLocked(packageName, restrictions, userId); 1191 } 1192 } 1193 1194 @Override 1195 public boolean setRestrictionsChallenge(String newPin) { 1196 checkManageUsersPermission("Only system can modify the restrictions pin"); 1197 int userId = UserHandle.getCallingUserId(); 1198 synchronized (mPackagesLock) { 1199 RestrictionsPinState pinState = mRestrictionsPinStates.get(userId); 1200 if (pinState == null) { 1201 pinState = new RestrictionsPinState(); 1202 } 1203 if (newPin == null) { 1204 pinState.salt = 0; 1205 pinState.pinHash = null; 1206 } else { 1207 try { 1208 pinState.salt = SecureRandom.getInstance("SHA1PRNG").nextLong(); 1209 } catch (NoSuchAlgorithmException e) { 1210 pinState.salt = (long) (Math.random() * Long.MAX_VALUE); 1211 } 1212 pinState.pinHash = passwordToHash(newPin, pinState.salt); 1213 pinState.failedAttempts = 0; 1214 } 1215 mRestrictionsPinStates.put(userId, pinState); 1216 writeUserLocked(mUsers.get(userId)); 1217 } 1218 return true; 1219 } 1220 1221 @Override 1222 public int checkRestrictionsChallenge(String pin) { 1223 checkManageUsersPermission("Only system can verify the restrictions pin"); 1224 int userId = UserHandle.getCallingUserId(); 1225 synchronized (mPackagesLock) { 1226 RestrictionsPinState pinState = mRestrictionsPinStates.get(userId); 1227 // If there's no pin set, return error code 1228 if (pinState == null || pinState.salt == 0 || pinState.pinHash == null) { 1229 return UserManager.PIN_VERIFICATION_FAILED_NOT_SET; 1230 } else if (pin == null) { 1231 // If just checking if user can be prompted, return remaining time 1232 int waitTime = getRemainingTimeForPinAttempt(pinState); 1233 Slog.d(LOG_TAG, "Remaining waittime peek=" + waitTime); 1234 return waitTime; 1235 } else { 1236 int waitTime = getRemainingTimeForPinAttempt(pinState); 1237 Slog.d(LOG_TAG, "Remaining waittime=" + waitTime); 1238 if (waitTime > 0) { 1239 return waitTime; 1240 } 1241 if (passwordToHash(pin, pinState.salt).equals(pinState.pinHash)) { 1242 pinState.failedAttempts = 0; 1243 writeUserLocked(mUsers.get(userId)); 1244 return UserManager.PIN_VERIFICATION_SUCCESS; 1245 } else { 1246 pinState.failedAttempts++; 1247 pinState.lastAttemptTime = System.currentTimeMillis(); 1248 writeUserLocked(mUsers.get(userId)); 1249 return waitTime; 1250 } 1251 } 1252 } 1253 } 1254 1255 private int getRemainingTimeForPinAttempt(RestrictionsPinState pinState) { 1256 int backoffIndex = Math.min(pinState.failedAttempts / BACKOFF_INC_INTERVAL, 1257 BACKOFF_TIMES.length - 1); 1258 int backoffTime = (pinState.failedAttempts % BACKOFF_INC_INTERVAL) == 0 ? 1259 BACKOFF_TIMES[backoffIndex] : 0; 1260 return (int) Math.max(backoffTime + pinState.lastAttemptTime - System.currentTimeMillis(), 1261 0); 1262 } 1263 1264 @Override 1265 public boolean hasRestrictionsChallenge() { 1266 int userId = UserHandle.getCallingUserId(); 1267 synchronized (mPackagesLock) { 1268 return hasRestrictionsPinLocked(userId); 1269 } 1270 } 1271 1272 private boolean hasRestrictionsPinLocked(int userId) { 1273 RestrictionsPinState pinState = mRestrictionsPinStates.get(userId); 1274 if (pinState == null || pinState.salt == 0 || pinState.pinHash == null) { 1275 return false; 1276 } 1277 return true; 1278 } 1279 1280 @Override 1281 public void removeRestrictions() { 1282 checkManageUsersPermission("Only system can remove restrictions"); 1283 final int userHandle = UserHandle.getCallingUserId(); 1284 removeRestrictionsForUser(userHandle, true); 1285 } 1286 1287 private void removeRestrictionsForUser(final int userHandle, boolean unblockApps) { 1288 synchronized (mPackagesLock) { 1289 // Remove all user restrictions 1290 setUserRestrictions(new Bundle(), userHandle); 1291 // Remove restrictions pin 1292 setRestrictionsChallenge(null); 1293 // Remove any app restrictions 1294 cleanAppRestrictions(userHandle, true); 1295 } 1296 if (unblockApps) { 1297 unblockAllAppsForUser(userHandle); 1298 } 1299 } 1300 1301 private void unblockAllAppsForUser(final int userHandle) { 1302 mHandler.post(new Runnable() { 1303 @Override 1304 public void run() { 1305 List<ApplicationInfo> apps = 1306 mPm.getInstalledApplications(PackageManager.GET_UNINSTALLED_PACKAGES, 1307 userHandle).getList(); 1308 final long ident = Binder.clearCallingIdentity(); 1309 try { 1310 for (ApplicationInfo appInfo : apps) { 1311 if ((appInfo.flags & ApplicationInfo.FLAG_INSTALLED) != 0 1312 && (appInfo.flags & ApplicationInfo.FLAG_BLOCKED) != 0) { 1313 mPm.setApplicationBlockedSettingAsUser(appInfo.packageName, false, 1314 userHandle); 1315 } 1316 } 1317 } finally { 1318 Binder.restoreCallingIdentity(ident); 1319 } 1320 } 1321 }); 1322 } 1323 1324 /* 1325 * Generate a hash for the given password. To avoid brute force attacks, we use a salted hash. 1326 * Not the most secure, but it is at least a second level of protection. First level is that 1327 * the file is in a location only readable by the system process. 1328 * @param password the password. 1329 * @param salt the randomly generated salt 1330 * @return the hash of the pattern in a String. 1331 */ 1332 private String passwordToHash(String password, long salt) { 1333 if (password == null) { 1334 return null; 1335 } 1336 String algo = null; 1337 String hashed = salt + password; 1338 try { 1339 byte[] saltedPassword = (password + salt).getBytes(); 1340 byte[] sha1 = MessageDigest.getInstance(algo = "SHA-1").digest(saltedPassword); 1341 byte[] md5 = MessageDigest.getInstance(algo = "MD5").digest(saltedPassword); 1342 hashed = toHex(sha1) + toHex(md5); 1343 } catch (NoSuchAlgorithmException e) { 1344 Log.w(LOG_TAG, "Failed to encode string because of missing algorithm: " + algo); 1345 } 1346 return hashed; 1347 } 1348 1349 private static String toHex(byte[] ary) { 1350 final String hex = "0123456789ABCDEF"; 1351 String ret = ""; 1352 for (int i = 0; i < ary.length; i++) { 1353 ret += hex.charAt((ary[i] >> 4) & 0xf); 1354 ret += hex.charAt(ary[i] & 0xf); 1355 } 1356 return ret; 1357 } 1358 1359 private int getUidForPackage(String packageName) { 1360 long ident = Binder.clearCallingIdentity(); 1361 try { 1362 return mContext.getPackageManager().getApplicationInfo(packageName, 1363 PackageManager.GET_UNINSTALLED_PACKAGES).uid; 1364 } catch (NameNotFoundException nnfe) { 1365 return -1; 1366 } finally { 1367 Binder.restoreCallingIdentity(ident); 1368 } 1369 } 1370 1371 private Bundle readApplicationRestrictionsLocked(String packageName, 1372 int userId) { 1373 final Bundle restrictions = new Bundle(); 1374 final ArrayList<String> values = new ArrayList<String>(); 1375 1376 FileInputStream fis = null; 1377 try { 1378 AtomicFile restrictionsFile = 1379 new AtomicFile(new File(Environment.getUserSystemDirectory(userId), 1380 packageToRestrictionsFileName(packageName))); 1381 fis = restrictionsFile.openRead(); 1382 XmlPullParser parser = Xml.newPullParser(); 1383 parser.setInput(fis, null); 1384 int type; 1385 while ((type = parser.next()) != XmlPullParser.START_TAG 1386 && type != XmlPullParser.END_DOCUMENT) { 1387 ; 1388 } 1389 1390 if (type != XmlPullParser.START_TAG) { 1391 Slog.e(LOG_TAG, "Unable to read restrictions file " 1392 + restrictionsFile.getBaseFile()); 1393 return restrictions; 1394 } 1395 1396 while ((type = parser.next()) != XmlPullParser.END_DOCUMENT) { 1397 if (type == XmlPullParser.START_TAG && parser.getName().equals(TAG_ENTRY)) { 1398 String key = parser.getAttributeValue(null, ATTR_KEY); 1399 String valType = parser.getAttributeValue(null, ATTR_VALUE_TYPE); 1400 String multiple = parser.getAttributeValue(null, ATTR_MULTIPLE); 1401 if (multiple != null) { 1402 int count = Integer.parseInt(multiple); 1403 while (count > 0 && (type = parser.next()) != XmlPullParser.END_DOCUMENT) { 1404 if (type == XmlPullParser.START_TAG 1405 && parser.getName().equals(TAG_VALUE)) { 1406 values.add(parser.nextText().trim()); 1407 count--; 1408 } 1409 } 1410 String [] valueStrings = new String[values.size()]; 1411 values.toArray(valueStrings); 1412 restrictions.putStringArray(key, valueStrings); 1413 } else if (ATTR_TYPE_BOOLEAN.equals(valType)) { 1414 restrictions.putBoolean(key, Boolean.parseBoolean( 1415 parser.nextText().trim())); 1416 } else { 1417 String value = parser.nextText().trim(); 1418 restrictions.putString(key, value); 1419 } 1420 } 1421 } 1422 1423 } catch (IOException ioe) { 1424 } catch (XmlPullParserException pe) { 1425 } finally { 1426 if (fis != null) { 1427 try { 1428 fis.close(); 1429 } catch (IOException e) { 1430 } 1431 } 1432 } 1433 return restrictions; 1434 } 1435 1436 private void writeApplicationRestrictionsLocked(String packageName, 1437 Bundle restrictions, int userId) { 1438 FileOutputStream fos = null; 1439 AtomicFile restrictionsFile = new AtomicFile( 1440 new File(Environment.getUserSystemDirectory(userId), 1441 packageToRestrictionsFileName(packageName))); 1442 try { 1443 fos = restrictionsFile.startWrite(); 1444 final BufferedOutputStream bos = new BufferedOutputStream(fos); 1445 1446 // XmlSerializer serializer = XmlUtils.serializerInstance(); 1447 final XmlSerializer serializer = new FastXmlSerializer(); 1448 serializer.setOutput(bos, "utf-8"); 1449 serializer.startDocument(null, true); 1450 serializer.setFeature("http://xmlpull.org/v1/doc/features.html#indent-output", true); 1451 1452 serializer.startTag(null, TAG_RESTRICTIONS); 1453 1454 for (String key : restrictions.keySet()) { 1455 Object value = restrictions.get(key); 1456 serializer.startTag(null, TAG_ENTRY); 1457 serializer.attribute(null, ATTR_KEY, key); 1458 1459 if (value instanceof Boolean) { 1460 serializer.attribute(null, ATTR_VALUE_TYPE, ATTR_TYPE_BOOLEAN); 1461 serializer.text(value.toString()); 1462 } else if (value == null || value instanceof String) { 1463 serializer.attribute(null, ATTR_VALUE_TYPE, ATTR_TYPE_STRING); 1464 serializer.text(value != null ? (String) value : ""); 1465 } else { 1466 serializer.attribute(null, ATTR_VALUE_TYPE, ATTR_TYPE_STRING_ARRAY); 1467 String[] values = (String[]) value; 1468 serializer.attribute(null, ATTR_MULTIPLE, Integer.toString(values.length)); 1469 for (String choice : values) { 1470 serializer.startTag(null, TAG_VALUE); 1471 serializer.text(choice != null ? choice : ""); 1472 serializer.endTag(null, TAG_VALUE); 1473 } 1474 } 1475 serializer.endTag(null, TAG_ENTRY); 1476 } 1477 1478 serializer.endTag(null, TAG_RESTRICTIONS); 1479 1480 serializer.endDocument(); 1481 restrictionsFile.finishWrite(fos); 1482 } catch (Exception e) { 1483 restrictionsFile.failWrite(fos); 1484 Slog.e(LOG_TAG, "Error writing application restrictions list"); 1485 } 1486 } 1487 1488 @Override 1489 public int getUserSerialNumber(int userHandle) { 1490 synchronized (mPackagesLock) { 1491 if (!exists(userHandle)) return -1; 1492 return getUserInfoLocked(userHandle).serialNumber; 1493 } 1494 } 1495 1496 @Override 1497 public int getUserHandle(int userSerialNumber) { 1498 synchronized (mPackagesLock) { 1499 for (int userId : mUserIds) { 1500 if (getUserInfoLocked(userId).serialNumber == userSerialNumber) return userId; 1501 } 1502 // Not found 1503 return -1; 1504 } 1505 } 1506 1507 /** 1508 * Caches the list of user ids in an array, adjusting the array size when necessary. 1509 */ 1510 private void updateUserIdsLocked() { 1511 int num = 0; 1512 for (int i = 0; i < mUsers.size(); i++) { 1513 if (!mUsers.valueAt(i).partial) { 1514 num++; 1515 } 1516 } 1517 final int[] newUsers = new int[num]; 1518 int n = 0; 1519 for (int i = 0; i < mUsers.size(); i++) { 1520 if (!mUsers.valueAt(i).partial) { 1521 newUsers[n++] = mUsers.keyAt(i); 1522 } 1523 } 1524 mUserIds = newUsers; 1525 } 1526 1527 /** 1528 * Make a note of the last started time of a user and do some cleanup. 1529 * @param userId the user that was just foregrounded 1530 */ 1531 public void userForeground(int userId) { 1532 synchronized (mPackagesLock) { 1533 UserInfo user = mUsers.get(userId); 1534 long now = System.currentTimeMillis(); 1535 if (user == null || user.partial) { 1536 Slog.w(LOG_TAG, "userForeground: unknown user #" + userId); 1537 return; 1538 } 1539 if (now > EPOCH_PLUS_30_YEARS) { 1540 user.lastLoggedInTime = now; 1541 writeUserLocked(user); 1542 } 1543 // If this is not a restricted profile and there is no restrictions pin, clean up 1544 // all restrictions files that might have been left behind, else clean up just the 1545 // ones with uninstalled packages 1546 RestrictionsPinState pinState = mRestrictionsPinStates.get(userId); 1547 final long salt = pinState == null ? 0 : pinState.salt; 1548 cleanAppRestrictions(userId, (!user.isRestricted() && salt == 0)); 1549 } 1550 } 1551 1552 /** 1553 * Returns the next available user id, filling in any holes in the ids. 1554 * TODO: May not be a good idea to recycle ids, in case it results in confusion 1555 * for data and battery stats collection, or unexpected cross-talk. 1556 * @return 1557 */ 1558 private int getNextAvailableIdLocked() { 1559 synchronized (mPackagesLock) { 1560 int i = MIN_USER_ID; 1561 while (i < Integer.MAX_VALUE) { 1562 if (mUsers.indexOfKey(i) < 0 && !mRemovingUserIds.get(i)) { 1563 break; 1564 } 1565 i++; 1566 } 1567 return i; 1568 } 1569 } 1570 1571 private String packageToRestrictionsFileName(String packageName) { 1572 return RESTRICTIONS_FILE_PREFIX + packageName + XML_SUFFIX; 1573 } 1574 1575 private String restrictionsFileNameToPackage(String fileName) { 1576 return fileName.substring(RESTRICTIONS_FILE_PREFIX.length(), 1577 (int) (fileName.length() - XML_SUFFIX.length())); 1578 } 1579 1580 @Override 1581 protected void dump(FileDescriptor fd, PrintWriter pw, String[] args) { 1582 if (mContext.checkCallingOrSelfPermission(android.Manifest.permission.DUMP) 1583 != PackageManager.PERMISSION_GRANTED) { 1584 pw.println("Permission Denial: can't dump UserManager from from pid=" 1585 + Binder.getCallingPid() 1586 + ", uid=" + Binder.getCallingUid() 1587 + " without permission " 1588 + android.Manifest.permission.DUMP); 1589 return; 1590 } 1591 1592 long now = System.currentTimeMillis(); 1593 StringBuilder sb = new StringBuilder(); 1594 synchronized (mPackagesLock) { 1595 pw.println("Users:"); 1596 for (int i = 0; i < mUsers.size(); i++) { 1597 UserInfo user = mUsers.valueAt(i); 1598 if (user == null) continue; 1599 pw.print(" "); pw.print(user); pw.print(" serialNo="); pw.print(user.serialNumber); 1600 if (mRemovingUserIds.get(mUsers.keyAt(i))) pw.print(" <removing> "); 1601 if (user.partial) pw.print(" <partial>"); 1602 pw.println(); 1603 pw.print(" Created: "); 1604 if (user.creationTime == 0) { 1605 pw.println("<unknown>"); 1606 } else { 1607 sb.setLength(0); 1608 TimeUtils.formatDuration(now - user.creationTime, sb); 1609 sb.append(" ago"); 1610 pw.println(sb); 1611 } 1612 pw.print(" Last logged in: "); 1613 if (user.lastLoggedInTime == 0) { 1614 pw.println("<unknown>"); 1615 } else { 1616 sb.setLength(0); 1617 TimeUtils.formatDuration(now - user.lastLoggedInTime, sb); 1618 sb.append(" ago"); 1619 pw.println(sb); 1620 } 1621 } 1622 } 1623 } 1624 1625 private PackageMonitor mUserPackageMonitor = new PackageMonitor() { 1626 @Override 1627 public void onPackageRemoved(String pkg, int uid) { 1628 final int userId = this.getChangingUserId(); 1629 // Package could be disappearing because it is being blocked, so also check if 1630 // it has been uninstalled. 1631 final boolean uninstalled = isPackageDisappearing(pkg) == PACKAGE_PERMANENT_CHANGE; 1632 if (uninstalled && userId >= 0 && !isPackageInstalled(pkg, userId)) { 1633 cleanAppRestrictionsForPackage(pkg, userId); 1634 } 1635 } 1636 }; 1637} 1638