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 17 package com.android.server.pm; 18 19 import static android.text.format.DateUtils.MINUTE_IN_MILLIS; 20 21 import android.app.Activity; 22 import android.app.ActivityManager; 23 import android.app.ActivityManagerNative; 24 import android.app.ActivityThread; 25 import android.app.IStopUserCallback; 26 import android.content.BroadcastReceiver; 27 import android.content.Context; 28 import android.content.Intent; 29 import android.content.pm.ApplicationInfo; 30 import android.content.pm.PackageManager; 31 import android.content.pm.PackageManager.NameNotFoundException; 32 import android.content.pm.UserInfo; 33 import android.graphics.Bitmap; 34 import android.graphics.BitmapFactory; 35 import android.os.Binder; 36 import android.os.Bundle; 37 import android.os.Environment; 38 import android.os.FileUtils; 39 import android.os.Handler; 40 import android.os.IUserManager; 41 import android.os.Process; 42 import android.os.RemoteException; 43 import android.os.UserHandle; 44 import android.os.UserManager; 45 import android.util.AtomicFile; 46 import android.util.Log; 47 import android.util.Slog; 48 import android.util.SparseArray; 49 import android.util.SparseBooleanArray; 50 import android.util.TimeUtils; 51 import android.util.Xml; 52 53 import com.android.internal.content.PackageMonitor; 54 import com.android.internal.util.ArrayUtils; 55 import com.android.internal.util.FastXmlSerializer; 56 57 import org.xmlpull.v1.XmlPullParser; 58 import org.xmlpull.v1.XmlPullParserException; 59 import org.xmlpull.v1.XmlSerializer; 60 61 import java.io.BufferedOutputStream; 62 import java.io.File; 63 import java.io.FileDescriptor; 64 import java.io.FileInputStream; 65 import java.io.FileNotFoundException; 66 import java.io.FileOutputStream; 67 import java.io.IOException; 68 import java.io.PrintWriter; 69 import java.security.MessageDigest; 70 import java.security.NoSuchAlgorithmException; 71 import java.security.SecureRandom; 72 import java.util.ArrayList; 73 import java.util.List; 74 75 public 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 TAG_USERS = "users"; 96 private static final String TAG_USER = "user"; 97 private static final String TAG_RESTRICTIONS = "restrictions"; 98 private static final String TAG_ENTRY = "entry"; 99 private static final String TAG_VALUE = "value"; 100 private static final String ATTR_KEY = "key"; 101 private static final String ATTR_VALUE_TYPE = "type"; 102 private static final String ATTR_MULTIPLE = "m"; 103 104 private static final String ATTR_TYPE_STRING_ARRAY = "sa"; 105 private static final String ATTR_TYPE_STRING = "s"; 106 private static final String ATTR_TYPE_BOOLEAN = "b"; 107 108 private static final String USER_INFO_DIR = "system" + File.separator + "users"; 109 private static final String USER_LIST_FILENAME = "userlist.xml"; 110 private static final String USER_PHOTO_FILENAME = "photo.png"; 111 112 private static final String RESTRICTIONS_FILE_PREFIX = "res_"; 113 private static final String XML_SUFFIX = ".xml"; 114 115 private static final int MIN_USER_ID = 10; 116 117 private static final int USER_VERSION = 4; 118 119 private static final long EPOCH_PLUS_30_YEARS = 30L * 365 * 24 * 60 * 60 * 1000L; // ms 120 121 // Number of attempts before jumping to the next BACKOFF_TIMES slot 122 private static final int BACKOFF_INC_INTERVAL = 5; 123 124 // Amount of time to force the user to wait before entering the PIN again, after failing 125 // BACKOFF_INC_INTERVAL times. 126 private static final int[] BACKOFF_TIMES = { 0, 30*1000, 60*1000, 5*60*1000, 30*60*1000 }; 127 128 private final Context mContext; 129 private final PackageManagerService mPm; 130 private final Object mInstallLock; 131 private final Object mPackagesLock; 132 133 private final Handler mHandler; 134 135 private final File mUsersDir; 136 private final File mUserListFile; 137 private final File mBaseUserPath; 138 139 private final SparseArray<UserInfo> mUsers = new SparseArray<UserInfo>(); 140 private final SparseArray<Bundle> mUserRestrictions = new SparseArray<Bundle>(); 141 142 class RestrictionsPinState { 143 long salt; 144 String pinHash; 145 int failedAttempts; 146 long lastAttemptTime; 147 } 148 149 private final SparseArray<RestrictionsPinState> mRestrictionsPinStates = 150 new SparseArray<RestrictionsPinState>(); 151 152 /** 153 * Set of user IDs being actively removed. Removed IDs linger in this set 154 * for several seconds to work around a VFS caching issue. 155 */ 156 // @GuardedBy("mPackagesLock") 157 private final SparseBooleanArray mRemovingUserIds = new SparseBooleanArray(); 158 159 private int[] mUserIds; 160 private boolean mGuestEnabled; 161 private int mNextSerialNumber; 162 private int mUserVersion = 0; 163 164 private static UserManagerService sInstance; 165 166 public static UserManagerService getInstance() { 167 synchronized (UserManagerService.class) { 168 return sInstance; 169 } 170 } 171 172 /** 173 * Available for testing purposes. 174 */ 175 UserManagerService(File dataDir, File baseUserPath) { 176 this(null, null, new Object(), new Object(), dataDir, baseUserPath); 177 } 178 179 /** 180 * Called by package manager to create the service. This is closely 181 * associated with the package manager, and the given lock is the 182 * package manager's own lock. 183 */ 184 UserManagerService(Context context, PackageManagerService pm, 185 Object installLock, Object packagesLock) { 186 this(context, pm, installLock, packagesLock, 187 Environment.getDataDirectory(), 188 new File(Environment.getDataDirectory(), "user")); 189 } 190 191 /** 192 * Available for testing purposes. 193 */ 194 private UserManagerService(Context context, PackageManagerService pm, 195 Object installLock, Object packagesLock, 196 File dataDir, File baseUserPath) { 197 mContext = context; 198 mPm = pm; 199 mInstallLock = installLock; 200 mPackagesLock = packagesLock; 201 mHandler = new Handler(); 202 synchronized (mInstallLock) { 203 synchronized (mPackagesLock) { 204 mUsersDir = new File(dataDir, USER_INFO_DIR); 205 mUsersDir.mkdirs(); 206 // Make zeroth user directory, for services to migrate their files to that location 207 File userZeroDir = new File(mUsersDir, "0"); 208 userZeroDir.mkdirs(); 209 mBaseUserPath = baseUserPath; 210 FileUtils.setPermissions(mUsersDir.toString(), 211 FileUtils.S_IRWXU|FileUtils.S_IRWXG 212 |FileUtils.S_IROTH|FileUtils.S_IXOTH, 213 -1, -1); 214 mUserListFile = new File(mUsersDir, USER_LIST_FILENAME); 215 readUserListLocked(); 216 // Prune out any partially created/partially removed users. 217 ArrayList<UserInfo> partials = new ArrayList<UserInfo>(); 218 for (int i = 0; i < mUsers.size(); i++) { 219 UserInfo ui = mUsers.valueAt(i); 220 if (ui.partial && i != 0) { 221 partials.add(ui); 222 } 223 } 224 for (int i = 0; i < partials.size(); i++) { 225 UserInfo ui = partials.get(i); 226 Slog.w(LOG_TAG, "Removing partially created user #" + i 227 + " (name=" + ui.name + ")"); 228 removeUserStateLocked(ui.id); 229 } 230 sInstance = this; 231 } 232 } 233 } 234 235 void systemReady() { 236 final Context context = ActivityThread.systemMain().getSystemContext(); 237 mUserPackageMonitor.register(context, 238 null, UserHandle.ALL, false); 239 userForeground(UserHandle.USER_OWNER); 240 } 241 242 @Override 243 public List<UserInfo> getUsers(boolean excludeDying) { 244 checkManageUsersPermission("query users"); 245 synchronized (mPackagesLock) { 246 ArrayList<UserInfo> users = new ArrayList<UserInfo>(mUsers.size()); 247 for (int i = 0; i < mUsers.size(); i++) { 248 UserInfo ui = mUsers.valueAt(i); 249 if (ui.partial) { 250 continue; 251 } 252 if (!excludeDying || !mRemovingUserIds.get(ui.id)) { 253 users.add(ui); 254 } 255 } 256 return users; 257 } 258 } 259 260 @Override 261 public UserInfo getUserInfo(int userId) { 262 checkManageUsersPermission("query user"); 263 synchronized (mPackagesLock) { 264 return getUserInfoLocked(userId); 265 } 266 } 267 268 @Override 269 public boolean isRestricted() { 270 synchronized (mPackagesLock) { 271 return getUserInfoLocked(UserHandle.getCallingUserId()).isRestricted(); 272 } 273 } 274 275 /* 276 * Should be locked on mUsers before calling this. 277 */ 278 private UserInfo getUserInfoLocked(int userId) { 279 UserInfo ui = mUsers.get(userId); 280 // If it is partial and not in the process of being removed, return as unknown user. 281 if (ui != null && ui.partial && !mRemovingUserIds.get(userId)) { 282 Slog.w(LOG_TAG, "getUserInfo: unknown user #" + userId); 283 return null; 284 } 285 return ui; 286 } 287 288 public boolean exists(int userId) { 289 synchronized (mPackagesLock) { 290 return ArrayUtils.contains(mUserIds, userId); 291 } 292 } 293 294 @Override 295 public void setUserName(int userId, String name) { 296 checkManageUsersPermission("rename users"); 297 boolean changed = false; 298 synchronized (mPackagesLock) { 299 UserInfo info = mUsers.get(userId); 300 if (info == null || info.partial) { 301 Slog.w(LOG_TAG, "setUserName: unknown user #" + userId); 302 return; 303 } 304 if (name != null && !name.equals(info.name)) { 305 info.name = name; 306 writeUserLocked(info); 307 changed = true; 308 } 309 } 310 if (changed) { 311 sendUserInfoChangedBroadcast(userId); 312 } 313 } 314 315 @Override 316 public void setUserIcon(int userId, Bitmap bitmap) { 317 checkManageUsersPermission("update users"); 318 synchronized (mPackagesLock) { 319 UserInfo info = mUsers.get(userId); 320 if (info == null || info.partial) { 321 Slog.w(LOG_TAG, "setUserIcon: unknown user #" + userId); 322 return; 323 } 324 writeBitmapLocked(info, bitmap); 325 writeUserLocked(info); 326 } 327 sendUserInfoChangedBroadcast(userId); 328 } 329 330 private void sendUserInfoChangedBroadcast(int userId) { 331 Intent changedIntent = new Intent(Intent.ACTION_USER_INFO_CHANGED); 332 changedIntent.putExtra(Intent.EXTRA_USER_HANDLE, userId); 333 changedIntent.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY); 334 mContext.sendBroadcastAsUser(changedIntent, UserHandle.ALL); 335 } 336 337 @Override 338 public Bitmap getUserIcon(int userId) { 339 checkManageUsersPermission("read users"); 340 synchronized (mPackagesLock) { 341 UserInfo info = mUsers.get(userId); 342 if (info == null || info.partial) { 343 Slog.w(LOG_TAG, "getUserIcon: unknown user #" + userId); 344 return null; 345 } 346 if (info.iconPath == null) { 347 return null; 348 } 349 return BitmapFactory.decodeFile(info.iconPath); 350 } 351 } 352 353 @Override 354 public void setGuestEnabled(boolean enable) { 355 checkManageUsersPermission("enable guest users"); 356 synchronized (mPackagesLock) { 357 if (mGuestEnabled != enable) { 358 mGuestEnabled = enable; 359 // Erase any guest user that currently exists 360 for (int i = 0; i < mUsers.size(); i++) { 361 UserInfo user = mUsers.valueAt(i); 362 if (!user.partial && user.isGuest()) { 363 if (!enable) { 364 removeUser(user.id); 365 } 366 return; 367 } 368 } 369 // No guest was found 370 if (enable) { 371 createUser("Guest", UserInfo.FLAG_GUEST); 372 } 373 } 374 } 375 } 376 377 @Override 378 public boolean isGuestEnabled() { 379 synchronized (mPackagesLock) { 380 return mGuestEnabled; 381 } 382 } 383 384 @Override 385 public void wipeUser(int userHandle) { 386 checkManageUsersPermission("wipe user"); 387 // TODO: 388 } 389 390 public void makeInitialized(int userId) { 391 checkManageUsersPermission("makeInitialized"); 392 synchronized (mPackagesLock) { 393 UserInfo info = mUsers.get(userId); 394 if (info == null || info.partial) { 395 Slog.w(LOG_TAG, "makeInitialized: unknown user #" + userId); 396 } 397 if ((info.flags&UserInfo.FLAG_INITIALIZED) == 0) { 398 info.flags |= UserInfo.FLAG_INITIALIZED; 399 writeUserLocked(info); 400 } 401 } 402 } 403 404 @Override 405 public Bundle getUserRestrictions(int userId) { 406 // checkManageUsersPermission("getUserRestrictions"); 407 408 synchronized (mPackagesLock) { 409 Bundle restrictions = mUserRestrictions.get(userId); 410 return restrictions != null ? restrictions : Bundle.EMPTY; 411 } 412 } 413 414 @Override 415 public void setUserRestrictions(Bundle restrictions, int userId) { 416 checkManageUsersPermission("setUserRestrictions"); 417 if (restrictions == null) return; 418 419 synchronized (mPackagesLock) { 420 mUserRestrictions.get(userId).clear(); 421 mUserRestrictions.get(userId).putAll(restrictions); 422 writeUserLocked(mUsers.get(userId)); 423 } 424 } 425 426 /** 427 * Check if we've hit the limit of how many users can be created. 428 */ 429 private boolean isUserLimitReachedLocked() { 430 int nUsers = mUsers.size(); 431 return nUsers >= UserManager.getMaxSupportedUsers(); 432 } 433 434 /** 435 * Enforces that only the system UID or root's UID or apps that have the 436 * {@link android.Manifest.permission.MANAGE_USERS MANAGE_USERS} 437 * permission can make certain calls to the UserManager. 438 * 439 * @param message used as message if SecurityException is thrown 440 * @throws SecurityException if the caller is not system or root 441 */ 442 private static final void checkManageUsersPermission(String message) { 443 final int uid = Binder.getCallingUid(); 444 if (uid != Process.SYSTEM_UID && uid != 0 445 && ActivityManager.checkComponentPermission( 446 android.Manifest.permission.MANAGE_USERS, 447 uid, -1, true) != PackageManager.PERMISSION_GRANTED) { 448 throw new SecurityException("You need MANAGE_USERS permission to: " + message); 449 } 450 } 451 452 private void writeBitmapLocked(UserInfo info, Bitmap bitmap) { 453 try { 454 File dir = new File(mUsersDir, Integer.toString(info.id)); 455 File file = new File(dir, USER_PHOTO_FILENAME); 456 if (!dir.exists()) { 457 dir.mkdir(); 458 FileUtils.setPermissions( 459 dir.getPath(), 460 FileUtils.S_IRWXU|FileUtils.S_IRWXG|FileUtils.S_IXOTH, 461 -1, -1); 462 } 463 FileOutputStream os; 464 if (bitmap.compress(Bitmap.CompressFormat.PNG, 100, os = new FileOutputStream(file))) { 465 info.iconPath = file.getAbsolutePath(); 466 } 467 try { 468 os.close(); 469 } catch (IOException ioe) { 470 // What the ... ! 471 } 472 } catch (FileNotFoundException e) { 473 Slog.w(LOG_TAG, "Error setting photo for user ", e); 474 } 475 } 476 477 /** 478 * Returns an array of user ids. This array is cached here for quick access, so do not modify or 479 * cache it elsewhere. 480 * @return the array of user ids. 481 */ 482 public int[] getUserIds() { 483 synchronized (mPackagesLock) { 484 return mUserIds; 485 } 486 } 487 488 int[] getUserIdsLPr() { 489 return mUserIds; 490 } 491 492 private void readUserListLocked() { 493 mGuestEnabled = false; 494 if (!mUserListFile.exists()) { 495 fallbackToSingleUserLocked(); 496 return; 497 } 498 FileInputStream fis = null; 499 AtomicFile userListFile = new AtomicFile(mUserListFile); 500 try { 501 fis = userListFile.openRead(); 502 XmlPullParser parser = Xml.newPullParser(); 503 parser.setInput(fis, null); 504 int type; 505 while ((type = parser.next()) != XmlPullParser.START_TAG 506 && type != XmlPullParser.END_DOCUMENT) { 507 ; 508 } 509 510 if (type != XmlPullParser.START_TAG) { 511 Slog.e(LOG_TAG, "Unable to read user list"); 512 fallbackToSingleUserLocked(); 513 return; 514 } 515 516 mNextSerialNumber = -1; 517 if (parser.getName().equals(TAG_USERS)) { 518 String lastSerialNumber = parser.getAttributeValue(null, ATTR_NEXT_SERIAL_NO); 519 if (lastSerialNumber != null) { 520 mNextSerialNumber = Integer.parseInt(lastSerialNumber); 521 } 522 String versionNumber = parser.getAttributeValue(null, ATTR_USER_VERSION); 523 if (versionNumber != null) { 524 mUserVersion = Integer.parseInt(versionNumber); 525 } 526 } 527 528 while ((type = parser.next()) != XmlPullParser.END_DOCUMENT) { 529 if (type == XmlPullParser.START_TAG && parser.getName().equals(TAG_USER)) { 530 String id = parser.getAttributeValue(null, ATTR_ID); 531 UserInfo user = readUserLocked(Integer.parseInt(id)); 532 533 if (user != null) { 534 mUsers.put(user.id, user); 535 if (user.isGuest()) { 536 mGuestEnabled = true; 537 } 538 if (mNextSerialNumber < 0 || mNextSerialNumber <= user.id) { 539 mNextSerialNumber = user.id + 1; 540 } 541 } 542 } 543 } 544 updateUserIdsLocked(); 545 upgradeIfNecessaryLocked(); 546 } catch (IOException ioe) { 547 fallbackToSingleUserLocked(); 548 } catch (XmlPullParserException pe) { 549 fallbackToSingleUserLocked(); 550 } finally { 551 if (fis != null) { 552 try { 553 fis.close(); 554 } catch (IOException e) { 555 } 556 } 557 } 558 } 559 560 /** 561 * Upgrade steps between versions, either for fixing bugs or changing the data format. 562 */ 563 private void upgradeIfNecessaryLocked() { 564 int userVersion = mUserVersion; 565 if (userVersion < 1) { 566 // Assign a proper name for the owner, if not initialized correctly before 567 UserInfo user = mUsers.get(UserHandle.USER_OWNER); 568 if ("Primary".equals(user.name)) { 569 user.name = mContext.getResources().getString(com.android.internal.R.string.owner_name); 570 writeUserLocked(user); 571 } 572 userVersion = 1; 573 } 574 575 if (userVersion < 2) { 576 // Owner should be marked as initialized 577 UserInfo user = mUsers.get(UserHandle.USER_OWNER); 578 if ((user.flags & UserInfo.FLAG_INITIALIZED) == 0) { 579 user.flags |= UserInfo.FLAG_INITIALIZED; 580 writeUserLocked(user); 581 } 582 userVersion = 2; 583 } 584 585 586 if (userVersion < 4) { 587 userVersion = 4; 588 } 589 590 if (userVersion < USER_VERSION) { 591 Slog.w(LOG_TAG, "User version " + mUserVersion + " didn't upgrade as expected to " 592 + USER_VERSION); 593 } else { 594 mUserVersion = userVersion; 595 writeUserListLocked(); 596 } 597 } 598 599 private void fallbackToSingleUserLocked() { 600 // Create the primary user 601 UserInfo primary = new UserInfo(UserHandle.USER_OWNER, 602 mContext.getResources().getString(com.android.internal.R.string.owner_name), null, 603 UserInfo.FLAG_ADMIN | UserInfo.FLAG_PRIMARY | UserInfo.FLAG_INITIALIZED); 604 mUsers.put(0, primary); 605 mNextSerialNumber = MIN_USER_ID; 606 mUserVersion = USER_VERSION; 607 608 Bundle restrictions = new Bundle(); 609 mUserRestrictions.append(UserHandle.USER_OWNER, restrictions); 610 611 updateUserIdsLocked(); 612 613 writeUserListLocked(); 614 writeUserLocked(primary); 615 } 616 617 /* 618 * Writes the user file in this format: 619 * 620 * <user flags="20039023" id="0"> 621 * <name>Primary</name> 622 * </user> 623 */ 624 private void writeUserLocked(UserInfo userInfo) { 625 FileOutputStream fos = null; 626 AtomicFile userFile = new AtomicFile(new File(mUsersDir, userInfo.id + XML_SUFFIX)); 627 try { 628 fos = userFile.startWrite(); 629 final BufferedOutputStream bos = new BufferedOutputStream(fos); 630 631 // XmlSerializer serializer = XmlUtils.serializerInstance(); 632 final XmlSerializer serializer = new FastXmlSerializer(); 633 serializer.setOutput(bos, "utf-8"); 634 serializer.startDocument(null, true); 635 serializer.setFeature("http://xmlpull.org/v1/doc/features.html#indent-output", true); 636 637 serializer.startTag(null, TAG_USER); 638 serializer.attribute(null, ATTR_ID, Integer.toString(userInfo.id)); 639 serializer.attribute(null, ATTR_SERIAL_NO, Integer.toString(userInfo.serialNumber)); 640 serializer.attribute(null, ATTR_FLAGS, Integer.toString(userInfo.flags)); 641 serializer.attribute(null, ATTR_CREATION_TIME, Long.toString(userInfo.creationTime)); 642 serializer.attribute(null, ATTR_LAST_LOGGED_IN_TIME, 643 Long.toString(userInfo.lastLoggedInTime)); 644 RestrictionsPinState pinState = mRestrictionsPinStates.get(userInfo.id); 645 if (pinState != null) { 646 if (pinState.salt != 0) { 647 serializer.attribute(null, ATTR_SALT, Long.toString(pinState.salt)); 648 } 649 if (pinState.pinHash != null) { 650 serializer.attribute(null, ATTR_PIN_HASH, pinState.pinHash); 651 } 652 if (pinState.failedAttempts != 0) { 653 serializer.attribute(null, ATTR_FAILED_ATTEMPTS, 654 Integer.toString(pinState.failedAttempts)); 655 serializer.attribute(null, ATTR_LAST_RETRY_MS, 656 Long.toString(pinState.lastAttemptTime)); 657 } 658 } 659 if (userInfo.iconPath != null) { 660 serializer.attribute(null, ATTR_ICON_PATH, userInfo.iconPath); 661 } 662 if (userInfo.partial) { 663 serializer.attribute(null, ATTR_PARTIAL, "true"); 664 } 665 666 serializer.startTag(null, TAG_NAME); 667 serializer.text(userInfo.name); 668 serializer.endTag(null, TAG_NAME); 669 670 Bundle restrictions = mUserRestrictions.get(userInfo.id); 671 if (restrictions != null) { 672 serializer.startTag(null, TAG_RESTRICTIONS); 673 writeBoolean(serializer, restrictions, UserManager.DISALLOW_CONFIG_WIFI); 674 writeBoolean(serializer, restrictions, UserManager.DISALLOW_MODIFY_ACCOUNTS); 675 writeBoolean(serializer, restrictions, UserManager.DISALLOW_INSTALL_APPS); 676 writeBoolean(serializer, restrictions, UserManager.DISALLOW_UNINSTALL_APPS); 677 writeBoolean(serializer, restrictions, UserManager.DISALLOW_SHARE_LOCATION); 678 writeBoolean(serializer, restrictions, 679 UserManager.DISALLOW_INSTALL_UNKNOWN_SOURCES); 680 writeBoolean(serializer, restrictions, UserManager.DISALLOW_CONFIG_BLUETOOTH); 681 writeBoolean(serializer, restrictions, UserManager.DISALLOW_USB_FILE_TRANSFER); 682 writeBoolean(serializer, restrictions, UserManager.DISALLOW_CONFIG_CREDENTIALS); 683 writeBoolean(serializer, restrictions, UserManager.DISALLOW_REMOVE_USER); 684 serializer.endTag(null, TAG_RESTRICTIONS); 685 } 686 serializer.endTag(null, TAG_USER); 687 688 serializer.endDocument(); 689 userFile.finishWrite(fos); 690 } catch (Exception ioe) { 691 Slog.e(LOG_TAG, "Error writing user info " + userInfo.id + "\n" + ioe); 692 userFile.failWrite(fos); 693 } 694 } 695 696 /* 697 * Writes the user list file in this format: 698 * 699 * <users nextSerialNumber="3"> 700 * <user id="0"></user> 701 * <user id="2"></user> 702 * </users> 703 */ 704 private void writeUserListLocked() { 705 FileOutputStream fos = null; 706 AtomicFile userListFile = new AtomicFile(mUserListFile); 707 try { 708 fos = userListFile.startWrite(); 709 final BufferedOutputStream bos = new BufferedOutputStream(fos); 710 711 // XmlSerializer serializer = XmlUtils.serializerInstance(); 712 final XmlSerializer serializer = new FastXmlSerializer(); 713 serializer.setOutput(bos, "utf-8"); 714 serializer.startDocument(null, true); 715 serializer.setFeature("http://xmlpull.org/v1/doc/features.html#indent-output", true); 716 717 serializer.startTag(null, TAG_USERS); 718 serializer.attribute(null, ATTR_NEXT_SERIAL_NO, Integer.toString(mNextSerialNumber)); 719 serializer.attribute(null, ATTR_USER_VERSION, Integer.toString(mUserVersion)); 720 721 for (int i = 0; i < mUsers.size(); i++) { 722 UserInfo user = mUsers.valueAt(i); 723 serializer.startTag(null, TAG_USER); 724 serializer.attribute(null, ATTR_ID, Integer.toString(user.id)); 725 serializer.endTag(null, TAG_USER); 726 } 727 728 serializer.endTag(null, TAG_USERS); 729 730 serializer.endDocument(); 731 userListFile.finishWrite(fos); 732 } catch (Exception e) { 733 userListFile.failWrite(fos); 734 Slog.e(LOG_TAG, "Error writing user list"); 735 } 736 } 737 738 private UserInfo readUserLocked(int id) { 739 int flags = 0; 740 int serialNumber = id; 741 String name = null; 742 String iconPath = null; 743 long creationTime = 0L; 744 long lastLoggedInTime = 0L; 745 long salt = 0L; 746 String pinHash = null; 747 int failedAttempts = 0; 748 long lastAttemptTime = 0L; 749 boolean partial = false; 750 Bundle restrictions = new Bundle(); 751 752 FileInputStream fis = null; 753 try { 754 AtomicFile userFile = 755 new AtomicFile(new File(mUsersDir, Integer.toString(id) + XML_SUFFIX)); 756 fis = userFile.openRead(); 757 XmlPullParser parser = Xml.newPullParser(); 758 parser.setInput(fis, null); 759 int type; 760 while ((type = parser.next()) != XmlPullParser.START_TAG 761 && type != XmlPullParser.END_DOCUMENT) { 762 ; 763 } 764 765 if (type != XmlPullParser.START_TAG) { 766 Slog.e(LOG_TAG, "Unable to read user " + id); 767 return null; 768 } 769 770 if (type == XmlPullParser.START_TAG && parser.getName().equals(TAG_USER)) { 771 int storedId = readIntAttribute(parser, ATTR_ID, -1); 772 if (storedId != id) { 773 Slog.e(LOG_TAG, "User id does not match the file name"); 774 return null; 775 } 776 serialNumber = readIntAttribute(parser, ATTR_SERIAL_NO, id); 777 flags = readIntAttribute(parser, ATTR_FLAGS, 0); 778 iconPath = parser.getAttributeValue(null, ATTR_ICON_PATH); 779 creationTime = readLongAttribute(parser, ATTR_CREATION_TIME, 0); 780 lastLoggedInTime = readLongAttribute(parser, ATTR_LAST_LOGGED_IN_TIME, 0); 781 salt = readLongAttribute(parser, ATTR_SALT, 0L); 782 pinHash = parser.getAttributeValue(null, ATTR_PIN_HASH); 783 failedAttempts = readIntAttribute(parser, ATTR_FAILED_ATTEMPTS, 0); 784 lastAttemptTime = readLongAttribute(parser, ATTR_LAST_RETRY_MS, 0L); 785 String valueString = parser.getAttributeValue(null, ATTR_PARTIAL); 786 if ("true".equals(valueString)) { 787 partial = true; 788 } 789 790 int outerDepth = parser.getDepth(); 791 while ((type = parser.next()) != XmlPullParser.END_DOCUMENT 792 && (type != XmlPullParser.END_TAG || parser.getDepth() > outerDepth)) { 793 if (type == XmlPullParser.END_TAG || type == XmlPullParser.TEXT) { 794 continue; 795 } 796 String tag = parser.getName(); 797 if (TAG_NAME.equals(tag)) { 798 type = parser.next(); 799 if (type == XmlPullParser.TEXT) { 800 name = parser.getText(); 801 } 802 } else if (TAG_RESTRICTIONS.equals(tag)) { 803 readBoolean(parser, restrictions, UserManager.DISALLOW_CONFIG_WIFI); 804 readBoolean(parser, restrictions, UserManager.DISALLOW_MODIFY_ACCOUNTS); 805 readBoolean(parser, restrictions, UserManager.DISALLOW_INSTALL_APPS); 806 readBoolean(parser, restrictions, UserManager.DISALLOW_UNINSTALL_APPS); 807 readBoolean(parser, restrictions, UserManager.DISALLOW_SHARE_LOCATION); 808 readBoolean(parser, restrictions, 809 UserManager.DISALLOW_INSTALL_UNKNOWN_SOURCES); 810 readBoolean(parser, restrictions, UserManager.DISALLOW_CONFIG_BLUETOOTH); 811 readBoolean(parser, restrictions, UserManager.DISALLOW_USB_FILE_TRANSFER); 812 readBoolean(parser, restrictions, UserManager.DISALLOW_CONFIG_CREDENTIALS); 813 readBoolean(parser, restrictions, UserManager.DISALLOW_REMOVE_USER); 814 } 815 } 816 } 817 818 UserInfo userInfo = new UserInfo(id, name, iconPath, flags); 819 userInfo.serialNumber = serialNumber; 820 userInfo.creationTime = creationTime; 821 userInfo.lastLoggedInTime = lastLoggedInTime; 822 userInfo.partial = partial; 823 mUserRestrictions.append(id, restrictions); 824 if (salt != 0L) { 825 RestrictionsPinState pinState = mRestrictionsPinStates.get(id); 826 if (pinState == null) { 827 pinState = new RestrictionsPinState(); 828 mRestrictionsPinStates.put(id, pinState); 829 } 830 pinState.salt = salt; 831 pinState.pinHash = pinHash; 832 pinState.failedAttempts = failedAttempts; 833 pinState.lastAttemptTime = lastAttemptTime; 834 } 835 return userInfo; 836 837 } catch (IOException ioe) { 838 } catch (XmlPullParserException pe) { 839 } finally { 840 if (fis != null) { 841 try { 842 fis.close(); 843 } catch (IOException e) { 844 } 845 } 846 } 847 return null; 848 } 849 850 private void readBoolean(XmlPullParser parser, Bundle restrictions, 851 String restrictionKey) { 852 String value = parser.getAttributeValue(null, restrictionKey); 853 if (value != null) { 854 restrictions.putBoolean(restrictionKey, Boolean.parseBoolean(value)); 855 } 856 } 857 858 private void writeBoolean(XmlSerializer xml, Bundle restrictions, String restrictionKey) 859 throws IOException { 860 if (restrictions.containsKey(restrictionKey)) { 861 xml.attribute(null, restrictionKey, 862 Boolean.toString(restrictions.getBoolean(restrictionKey))); 863 } 864 } 865 866 private int readIntAttribute(XmlPullParser parser, String attr, int defaultValue) { 867 String valueString = parser.getAttributeValue(null, attr); 868 if (valueString == null) return defaultValue; 869 try { 870 return Integer.parseInt(valueString); 871 } catch (NumberFormatException nfe) { 872 return defaultValue; 873 } 874 } 875 876 private long readLongAttribute(XmlPullParser parser, String attr, long defaultValue) { 877 String valueString = parser.getAttributeValue(null, attr); 878 if (valueString == null) return defaultValue; 879 try { 880 return Long.parseLong(valueString); 881 } catch (NumberFormatException nfe) { 882 return defaultValue; 883 } 884 } 885 886 private boolean isPackageInstalled(String pkg, int userId) { 887 final ApplicationInfo info = mPm.getApplicationInfo(pkg, 888 PackageManager.GET_UNINSTALLED_PACKAGES, 889 userId); 890 if (info == null || (info.flags&ApplicationInfo.FLAG_INSTALLED) == 0) { 891 return false; 892 } 893 return true; 894 } 895 896 /** 897 * Removes all the restrictions files (res_<packagename>) for a given user, if all is true, 898 * else removes only those packages that have been uninstalled. 899 * Does not do any permissions checking. 900 */ 901 private void cleanAppRestrictions(int userId, boolean all) { 902 synchronized (mPackagesLock) { 903 File dir = Environment.getUserSystemDirectory(userId); 904 String[] files = dir.list(); 905 if (files == null) return; 906 for (String fileName : files) { 907 if (fileName.startsWith(RESTRICTIONS_FILE_PREFIX)) { 908 File resFile = new File(dir, fileName); 909 if (resFile.exists()) { 910 if (all) { 911 resFile.delete(); 912 } else { 913 String pkg = restrictionsFileNameToPackage(fileName); 914 if (!isPackageInstalled(pkg, userId)) { 915 resFile.delete(); 916 } 917 } 918 } 919 } 920 } 921 } 922 } 923 924 /** 925 * Removes the app restrictions file for a specific package and user id, if it exists. 926 */ 927 private void cleanAppRestrictionsForPackage(String pkg, int userId) { 928 synchronized (mPackagesLock) { 929 File dir = Environment.getUserSystemDirectory(userId); 930 File resFile = new File(dir, packageToRestrictionsFileName(pkg)); 931 if (resFile.exists()) { 932 resFile.delete(); 933 } 934 } 935 } 936 937 @Override 938 public UserInfo createUser(String name, int flags) { 939 checkManageUsersPermission("Only the system can create users"); 940 941 final long ident = Binder.clearCallingIdentity(); 942 final UserInfo userInfo; 943 try { 944 synchronized (mInstallLock) { 945 synchronized (mPackagesLock) { 946 if (isUserLimitReachedLocked()) return null; 947 int userId = getNextAvailableIdLocked(); 948 userInfo = new UserInfo(userId, name, null, flags); 949 File userPath = new File(mBaseUserPath, Integer.toString(userId)); 950 userInfo.serialNumber = mNextSerialNumber++; 951 long now = System.currentTimeMillis(); 952 userInfo.creationTime = (now > EPOCH_PLUS_30_YEARS) ? now : 0; 953 userInfo.partial = true; 954 Environment.getUserSystemDirectory(userInfo.id).mkdirs(); 955 mUsers.put(userId, userInfo); 956 writeUserListLocked(); 957 writeUserLocked(userInfo); 958 mPm.createNewUserLILPw(userId, userPath); 959 userInfo.partial = false; 960 writeUserLocked(userInfo); 961 updateUserIdsLocked(); 962 Bundle restrictions = new Bundle(); 963 mUserRestrictions.append(userId, restrictions); 964 } 965 } 966 if (userInfo != null) { 967 Intent addedIntent = new Intent(Intent.ACTION_USER_ADDED); 968 addedIntent.putExtra(Intent.EXTRA_USER_HANDLE, userInfo.id); 969 mContext.sendBroadcastAsUser(addedIntent, UserHandle.ALL, 970 android.Manifest.permission.MANAGE_USERS); 971 } 972 } finally { 973 Binder.restoreCallingIdentity(ident); 974 } 975 return userInfo; 976 } 977 978 /** 979 * Removes a user and all data directories created for that user. This method should be called 980 * after the user's processes have been terminated. 981 * @param id the user's id 982 */ 983 public boolean removeUser(int userHandle) { 984 checkManageUsersPermission("Only the system can remove users"); 985 final UserInfo user; 986 synchronized (mPackagesLock) { 987 user = mUsers.get(userHandle); 988 if (userHandle == 0 || user == null) { 989 return false; 990 } 991 mRemovingUserIds.put(userHandle, true); 992 // Set this to a partially created user, so that the user will be purged 993 // on next startup, in case the runtime stops now before stopping and 994 // removing the user completely. 995 user.partial = true; 996 writeUserLocked(user); 997 } 998 if (DBG) Slog.i(LOG_TAG, "Stopping user " + userHandle); 999 int res; 1000 try { 1001 res = ActivityManagerNative.getDefault().stopUser(userHandle, 1002 new IStopUserCallback.Stub() { 1003 @Override 1004 public void userStopped(int userId) { 1005 finishRemoveUser(userId); 1006 } 1007 @Override 1008 public void userStopAborted(int userId) { 1009 } 1010 }); 1011 } catch (RemoteException e) { 1012 return false; 1013 } 1014 1015 return res == ActivityManager.USER_OP_SUCCESS; 1016 } 1017 1018 void finishRemoveUser(final int userHandle) { 1019 if (DBG) Slog.i(LOG_TAG, "finishRemoveUser " + userHandle); 1020 // Let other services shutdown any activity and clean up their state before completely 1021 // wiping the user's system directory and removing from the user list 1022 long ident = Binder.clearCallingIdentity(); 1023 try { 1024 Intent addedIntent = new Intent(Intent.ACTION_USER_REMOVED); 1025 addedIntent.putExtra(Intent.EXTRA_USER_HANDLE, userHandle); 1026 mContext.sendOrderedBroadcastAsUser(addedIntent, UserHandle.ALL, 1027 android.Manifest.permission.MANAGE_USERS, 1028 1029 new BroadcastReceiver() { 1030 @Override 1031 public void onReceive(Context context, Intent intent) { 1032 if (DBG) { 1033 Slog.i(LOG_TAG, 1034 "USER_REMOVED broadcast sent, cleaning up user data " 1035 + userHandle); 1036 } 1037 new Thread() { 1038 public void run() { 1039 synchronized (mInstallLock) { 1040 synchronized (mPackagesLock) { 1041 removeUserStateLocked(userHandle); 1042 } 1043 } 1044 } 1045 }.start(); 1046 } 1047 }, 1048 1049 null, Activity.RESULT_OK, null, null); 1050 } finally { 1051 Binder.restoreCallingIdentity(ident); 1052 } 1053 } 1054 1055 private void removeUserStateLocked(final int userHandle) { 1056 // Cleanup package manager settings 1057 mPm.cleanUpUserLILPw(userHandle); 1058 1059 // Remove this user from the list 1060 mUsers.remove(userHandle); 1061 1062 // Have user ID linger for several seconds to let external storage VFS 1063 // cache entries expire. This must be greater than the 'entry_valid' 1064 // timeout used by the FUSE daemon. 1065 mHandler.postDelayed(new Runnable() { 1066 @Override 1067 public void run() { 1068 synchronized (mPackagesLock) { 1069 mRemovingUserIds.delete(userHandle); 1070 } 1071 } 1072 }, MINUTE_IN_MILLIS); 1073 1074 mRestrictionsPinStates.remove(userHandle); 1075 // Remove user file 1076 AtomicFile userFile = new AtomicFile(new File(mUsersDir, userHandle + XML_SUFFIX)); 1077 userFile.delete(); 1078 // Update the user list 1079 writeUserListLocked(); 1080 updateUserIdsLocked(); 1081 removeDirectoryRecursive(Environment.getUserSystemDirectory(userHandle)); 1082 } 1083 1084 private void removeDirectoryRecursive(File parent) { 1085 if (parent.isDirectory()) { 1086 String[] files = parent.list(); 1087 for (String filename : files) { 1088 File child = new File(parent, filename); 1089 removeDirectoryRecursive(child); 1090 } 1091 } 1092 parent.delete(); 1093 } 1094 1095 @Override 1096 public Bundle getApplicationRestrictions(String packageName) { 1097 return getApplicationRestrictionsForUser(packageName, UserHandle.getCallingUserId()); 1098 } 1099 1100 @Override 1101 public Bundle getApplicationRestrictionsForUser(String packageName, int userId) { 1102 if (UserHandle.getCallingUserId() != userId 1103 || !UserHandle.isSameApp(Binder.getCallingUid(), getUidForPackage(packageName))) { 1104 checkManageUsersPermission("Only system can get restrictions for other users/apps"); 1105 } 1106 synchronized (mPackagesLock) { 1107 // Read the restrictions from XML 1108 return readApplicationRestrictionsLocked(packageName, userId); 1109 } 1110 } 1111 1112 @Override 1113 public void setApplicationRestrictions(String packageName, Bundle restrictions, 1114 int userId) { 1115 if (UserHandle.getCallingUserId() != userId 1116 || !UserHandle.isSameApp(Binder.getCallingUid(), getUidForPackage(packageName))) { 1117 checkManageUsersPermission("Only system can set restrictions for other users/apps"); 1118 } 1119 synchronized (mPackagesLock) { 1120 // Write the restrictions to XML 1121 writeApplicationRestrictionsLocked(packageName, restrictions, userId); 1122 } 1123 } 1124 1125 @Override 1126 public boolean setRestrictionsChallenge(String newPin) { 1127 checkManageUsersPermission("Only system can modify the restrictions pin"); 1128 int userId = UserHandle.getCallingUserId(); 1129 synchronized (mPackagesLock) { 1130 RestrictionsPinState pinState = mRestrictionsPinStates.get(userId); 1131 if (pinState == null) { 1132 pinState = new RestrictionsPinState(); 1133 } 1134 if (newPin == null) { 1135 pinState.salt = 0; 1136 pinState.pinHash = null; 1137 } else { 1138 try { 1139 pinState.salt = SecureRandom.getInstance("SHA1PRNG").nextLong(); 1140 } catch (NoSuchAlgorithmException e) { 1141 pinState.salt = (long) (Math.random() * Long.MAX_VALUE); 1142 } 1143 pinState.pinHash = passwordToHash(newPin, pinState.salt); 1144 pinState.failedAttempts = 0; 1145 } 1146 mRestrictionsPinStates.put(userId, pinState); 1147 writeUserLocked(mUsers.get(userId)); 1148 } 1149 return true; 1150 } 1151 1152 @Override 1153 public int checkRestrictionsChallenge(String pin) { 1154 checkManageUsersPermission("Only system can verify the restrictions pin"); 1155 int userId = UserHandle.getCallingUserId(); 1156 synchronized (mPackagesLock) { 1157 RestrictionsPinState pinState = mRestrictionsPinStates.get(userId); 1158 // If there's no pin set, return error code 1159 if (pinState == null || pinState.salt == 0 || pinState.pinHash == null) { 1160 return UserManager.PIN_VERIFICATION_FAILED_NOT_SET; 1161 } else if (pin == null) { 1162 // If just checking if user can be prompted, return remaining time 1163 int waitTime = getRemainingTimeForPinAttempt(pinState); 1164 Slog.d(LOG_TAG, "Remaining waittime peek=" + waitTime); 1165 return waitTime; 1166 } else { 1167 int waitTime = getRemainingTimeForPinAttempt(pinState); 1168 Slog.d(LOG_TAG, "Remaining waittime=" + waitTime); 1169 if (waitTime > 0) { 1170 return waitTime; 1171 } 1172 if (passwordToHash(pin, pinState.salt).equals(pinState.pinHash)) { 1173 pinState.failedAttempts = 0; 1174 writeUserLocked(mUsers.get(userId)); 1175 return UserManager.PIN_VERIFICATION_SUCCESS; 1176 } else { 1177 pinState.failedAttempts++; 1178 pinState.lastAttemptTime = System.currentTimeMillis(); 1179 writeUserLocked(mUsers.get(userId)); 1180 return waitTime; 1181 } 1182 } 1183 } 1184 } 1185 1186 private int getRemainingTimeForPinAttempt(RestrictionsPinState pinState) { 1187 int backoffIndex = Math.min(pinState.failedAttempts / BACKOFF_INC_INTERVAL, 1188 BACKOFF_TIMES.length - 1); 1189 int backoffTime = (pinState.failedAttempts % BACKOFF_INC_INTERVAL) == 0 ? 1190 BACKOFF_TIMES[backoffIndex] : 0; 1191 return (int) Math.max(backoffTime + pinState.lastAttemptTime - System.currentTimeMillis(), 1192 0); 1193 } 1194 1195 @Override 1196 public boolean hasRestrictionsChallenge() { 1197 int userId = UserHandle.getCallingUserId(); 1198 synchronized (mPackagesLock) { 1199 return hasRestrictionsPinLocked(userId); 1200 } 1201 } 1202 1203 private boolean hasRestrictionsPinLocked(int userId) { 1204 RestrictionsPinState pinState = mRestrictionsPinStates.get(userId); 1205 if (pinState == null || pinState.salt == 0 || pinState.pinHash == null) { 1206 return false; 1207 } 1208 return true; 1209 } 1210 1211 @Override 1212 public void removeRestrictions() { 1213 checkManageUsersPermission("Only system can remove restrictions"); 1214 final int userHandle = UserHandle.getCallingUserId(); 1215 removeRestrictionsForUser(userHandle, true); 1216 } 1217 1218 private void removeRestrictionsForUser(final int userHandle, boolean unblockApps) { 1219 synchronized (mPackagesLock) { 1220 // Remove all user restrictions 1221 setUserRestrictions(new Bundle(), userHandle); 1222 // Remove restrictions pin 1223 setRestrictionsChallenge(null); 1224 // Remove any app restrictions 1225 cleanAppRestrictions(userHandle, true); 1226 } 1227 if (unblockApps) { 1228 unblockAllAppsForUser(userHandle); 1229 } 1230 } 1231 1232 private void unblockAllAppsForUser(final int userHandle) { 1233 mHandler.post(new Runnable() { 1234 @Override 1235 public void run() { 1236 List<ApplicationInfo> apps = 1237 mPm.getInstalledApplications(PackageManager.GET_UNINSTALLED_PACKAGES, 1238 userHandle).getList(); 1239 final long ident = Binder.clearCallingIdentity(); 1240 try { 1241 for (ApplicationInfo appInfo : apps) { 1242 if ((appInfo.flags & ApplicationInfo.FLAG_INSTALLED) != 0 1243 && (appInfo.flags & ApplicationInfo.FLAG_BLOCKED) != 0) { 1244 mPm.setApplicationBlockedSettingAsUser(appInfo.packageName, false, 1245 userHandle); 1246 } 1247 } 1248 } finally { 1249 Binder.restoreCallingIdentity(ident); 1250 } 1251 } 1252 }); 1253 } 1254 1255 /* 1256 * Generate a hash for the given password. To avoid brute force attacks, we use a salted hash. 1257 * Not the most secure, but it is at least a second level of protection. First level is that 1258 * the file is in a location only readable by the system process. 1259 * @param password the password. 1260 * @param salt the randomly generated salt 1261 * @return the hash of the pattern in a String. 1262 */ 1263 private String passwordToHash(String password, long salt) { 1264 if (password == null) { 1265 return null; 1266 } 1267 String algo = null; 1268 String hashed = salt + password; 1269 try { 1270 byte[] saltedPassword = (password + salt).getBytes(); 1271 byte[] sha1 = MessageDigest.getInstance(algo = "SHA-1").digest(saltedPassword); 1272 byte[] md5 = MessageDigest.getInstance(algo = "MD5").digest(saltedPassword); 1273 hashed = toHex(sha1) + toHex(md5); 1274 } catch (NoSuchAlgorithmException e) { 1275 Log.w(LOG_TAG, "Failed to encode string because of missing algorithm: " + algo); 1276 } 1277 return hashed; 1278 } 1279 1280 private static String toHex(byte[] ary) { 1281 final String hex = "0123456789ABCDEF"; 1282 String ret = ""; 1283 for (int i = 0; i < ary.length; i++) { 1284 ret += hex.charAt((ary[i] >> 4) & 0xf); 1285 ret += hex.charAt(ary[i] & 0xf); 1286 } 1287 return ret; 1288 } 1289 1290 private int getUidForPackage(String packageName) { 1291 long ident = Binder.clearCallingIdentity(); 1292 try { 1293 return mContext.getPackageManager().getApplicationInfo(packageName, 1294 PackageManager.GET_UNINSTALLED_PACKAGES).uid; 1295 } catch (NameNotFoundException nnfe) { 1296 return -1; 1297 } finally { 1298 Binder.restoreCallingIdentity(ident); 1299 } 1300 } 1301 1302 private Bundle readApplicationRestrictionsLocked(String packageName, 1303 int userId) { 1304 final Bundle restrictions = new Bundle(); 1305 final ArrayList<String> values = new ArrayList<String>(); 1306 1307 FileInputStream fis = null; 1308 try { 1309 AtomicFile restrictionsFile = 1310 new AtomicFile(new File(Environment.getUserSystemDirectory(userId), 1311 packageToRestrictionsFileName(packageName))); 1312 fis = restrictionsFile.openRead(); 1313 XmlPullParser parser = Xml.newPullParser(); 1314 parser.setInput(fis, null); 1315 int type; 1316 while ((type = parser.next()) != XmlPullParser.START_TAG 1317 && type != XmlPullParser.END_DOCUMENT) { 1318 ; 1319 } 1320 1321 if (type != XmlPullParser.START_TAG) { 1322 Slog.e(LOG_TAG, "Unable to read restrictions file " 1323 + restrictionsFile.getBaseFile()); 1324 return restrictions; 1325 } 1326 1327 while ((type = parser.next()) != XmlPullParser.END_DOCUMENT) { 1328 if (type == XmlPullParser.START_TAG && parser.getName().equals(TAG_ENTRY)) { 1329 String key = parser.getAttributeValue(null, ATTR_KEY); 1330 String valType = parser.getAttributeValue(null, ATTR_VALUE_TYPE); 1331 String multiple = parser.getAttributeValue(null, ATTR_MULTIPLE); 1332 if (multiple != null) { 1333 int count = Integer.parseInt(multiple); 1334 while (count > 0 && (type = parser.next()) != XmlPullParser.END_DOCUMENT) { 1335 if (type == XmlPullParser.START_TAG 1336 && parser.getName().equals(TAG_VALUE)) { 1337 values.add(parser.nextText().trim()); 1338 count--; 1339 } 1340 } 1341 String [] valueStrings = new String[values.size()]; 1342 values.toArray(valueStrings); 1343 restrictions.putStringArray(key, valueStrings); 1344 } else if (ATTR_TYPE_BOOLEAN.equals(valType)) { 1345 restrictions.putBoolean(key, Boolean.parseBoolean( 1346 parser.nextText().trim())); 1347 } else { 1348 String value = parser.nextText().trim(); 1349 restrictions.putString(key, value); 1350 } 1351 } 1352 } 1353 1354 } catch (IOException ioe) { 1355 } catch (XmlPullParserException pe) { 1356 } finally { 1357 if (fis != null) { 1358 try { 1359 fis.close(); 1360 } catch (IOException e) { 1361 } 1362 } 1363 } 1364 return restrictions; 1365 } 1366 1367 private void writeApplicationRestrictionsLocked(String packageName, 1368 Bundle restrictions, int userId) { 1369 FileOutputStream fos = null; 1370 AtomicFile restrictionsFile = new AtomicFile( 1371 new File(Environment.getUserSystemDirectory(userId), 1372 packageToRestrictionsFileName(packageName))); 1373 try { 1374 fos = restrictionsFile.startWrite(); 1375 final BufferedOutputStream bos = new BufferedOutputStream(fos); 1376 1377 // XmlSerializer serializer = XmlUtils.serializerInstance(); 1378 final XmlSerializer serializer = new FastXmlSerializer(); 1379 serializer.setOutput(bos, "utf-8"); 1380 serializer.startDocument(null, true); 1381 serializer.setFeature("http://xmlpull.org/v1/doc/features.html#indent-output", true); 1382 1383 serializer.startTag(null, TAG_RESTRICTIONS); 1384 1385 for (String key : restrictions.keySet()) { 1386 Object value = restrictions.get(key); 1387 serializer.startTag(null, TAG_ENTRY); 1388 serializer.attribute(null, ATTR_KEY, key); 1389 1390 if (value instanceof Boolean) { 1391 serializer.attribute(null, ATTR_VALUE_TYPE, ATTR_TYPE_BOOLEAN); 1392 serializer.text(value.toString()); 1393 } else if (value == null || value instanceof String) { 1394 serializer.attribute(null, ATTR_VALUE_TYPE, ATTR_TYPE_STRING); 1395 serializer.text(value != null ? (String) value : ""); 1396 } else { 1397 serializer.attribute(null, ATTR_VALUE_TYPE, ATTR_TYPE_STRING_ARRAY); 1398 String[] values = (String[]) value; 1399 serializer.attribute(null, ATTR_MULTIPLE, Integer.toString(values.length)); 1400 for (String choice : values) { 1401 serializer.startTag(null, TAG_VALUE); 1402 serializer.text(choice != null ? choice : ""); 1403 serializer.endTag(null, TAG_VALUE); 1404 } 1405 } 1406 serializer.endTag(null, TAG_ENTRY); 1407 } 1408 1409 serializer.endTag(null, TAG_RESTRICTIONS); 1410 1411 serializer.endDocument(); 1412 restrictionsFile.finishWrite(fos); 1413 } catch (Exception e) { 1414 restrictionsFile.failWrite(fos); 1415 Slog.e(LOG_TAG, "Error writing application restrictions list"); 1416 } 1417 } 1418 1419 @Override 1420 public int getUserSerialNumber(int userHandle) { 1421 synchronized (mPackagesLock) { 1422 if (!exists(userHandle)) return -1; 1423 return getUserInfoLocked(userHandle).serialNumber; 1424 } 1425 } 1426 1427 @Override 1428 public int getUserHandle(int userSerialNumber) { 1429 synchronized (mPackagesLock) { 1430 for (int userId : mUserIds) { 1431 if (getUserInfoLocked(userId).serialNumber == userSerialNumber) return userId; 1432 } 1433 // Not found 1434 return -1; 1435 } 1436 } 1437 1438 /** 1439 * Caches the list of user ids in an array, adjusting the array size when necessary. 1440 */ 1441 private void updateUserIdsLocked() { 1442 int num = 0; 1443 for (int i = 0; i < mUsers.size(); i++) { 1444 if (!mUsers.valueAt(i).partial) { 1445 num++; 1446 } 1447 } 1448 final int[] newUsers = new int[num]; 1449 int n = 0; 1450 for (int i = 0; i < mUsers.size(); i++) { 1451 if (!mUsers.valueAt(i).partial) { 1452 newUsers[n++] = mUsers.keyAt(i); 1453 } 1454 } 1455 mUserIds = newUsers; 1456 } 1457 1458 /** 1459 * Make a note of the last started time of a user and do some cleanup. 1460 * @param userId the user that was just foregrounded 1461 */ 1462 public void userForeground(int userId) { 1463 synchronized (mPackagesLock) { 1464 UserInfo user = mUsers.get(userId); 1465 long now = System.currentTimeMillis(); 1466 if (user == null || user.partial) { 1467 Slog.w(LOG_TAG, "userForeground: unknown user #" + userId); 1468 return; 1469 } 1470 if (now > EPOCH_PLUS_30_YEARS) { 1471 user.lastLoggedInTime = now; 1472 writeUserLocked(user); 1473 } 1474 // If this is not a restricted profile and there is no restrictions pin, clean up 1475 // all restrictions files that might have been left behind, else clean up just the 1476 // ones with uninstalled packages 1477 RestrictionsPinState pinState = mRestrictionsPinStates.get(userId); 1478 final long salt = pinState == null ? 0 : pinState.salt; 1479 cleanAppRestrictions(userId, (!user.isRestricted() && salt == 0)); 1480 } 1481 } 1482 1483 /** 1484 * Returns the next available user id, filling in any holes in the ids. 1485 * TODO: May not be a good idea to recycle ids, in case it results in confusion 1486 * for data and battery stats collection, or unexpected cross-talk. 1487 * @return 1488 */ 1489 private int getNextAvailableIdLocked() { 1490 synchronized (mPackagesLock) { 1491 int i = MIN_USER_ID; 1492 while (i < Integer.MAX_VALUE) { 1493 if (mUsers.indexOfKey(i) < 0 && !mRemovingUserIds.get(i)) { 1494 break; 1495 } 1496 i++; 1497 } 1498 return i; 1499 } 1500 } 1501 1502 private String packageToRestrictionsFileName(String packageName) { 1503 return RESTRICTIONS_FILE_PREFIX + packageName + XML_SUFFIX; 1504 } 1505 1506 private String restrictionsFileNameToPackage(String fileName) { 1507 return fileName.substring(RESTRICTIONS_FILE_PREFIX.length(), 1508 (int) (fileName.length() - XML_SUFFIX.length())); 1509 } 1510 1511 @Override 1512 protected void dump(FileDescriptor fd, PrintWriter pw, String[] args) { 1513 if (mContext.checkCallingOrSelfPermission(android.Manifest.permission.DUMP) 1514 != PackageManager.PERMISSION_GRANTED) { 1515 pw.println("Permission Denial: can't dump UserManager from from pid=" 1516 + Binder.getCallingPid() 1517 + ", uid=" + Binder.getCallingUid() 1518 + " without permission " 1519 + android.Manifest.permission.DUMP); 1520 return; 1521 } 1522 1523 long now = System.currentTimeMillis(); 1524 StringBuilder sb = new StringBuilder(); 1525 synchronized (mPackagesLock) { 1526 pw.println("Users:"); 1527 for (int i = 0; i < mUsers.size(); i++) { 1528 UserInfo user = mUsers.valueAt(i); 1529 if (user == null) continue; 1530 pw.print(" "); pw.print(user); pw.print(" serialNo="); pw.print(user.serialNumber); 1531 if (mRemovingUserIds.get(mUsers.keyAt(i))) pw.print(" <removing> "); 1532 if (user.partial) pw.print(" <partial>"); 1533 pw.println(); 1534 pw.print(" Created: "); 1535 if (user.creationTime == 0) { 1536 pw.println("<unknown>"); 1537 } else { 1538 sb.setLength(0); 1539 TimeUtils.formatDuration(now - user.creationTime, sb); 1540 sb.append(" ago"); 1541 pw.println(sb); 1542 } 1543 pw.print(" Last logged in: "); 1544 if (user.lastLoggedInTime == 0) { 1545 pw.println("<unknown>"); 1546 } else { 1547 sb.setLength(0); 1548 TimeUtils.formatDuration(now - user.lastLoggedInTime, sb); 1549 sb.append(" ago"); 1550 pw.println(sb); 1551 } 1552 } 1553 } 1554 } 1555 1556 private PackageMonitor mUserPackageMonitor = new PackageMonitor() { 1557 @Override 1558 public void onPackageRemoved(String pkg, int uid) { 1559 final int userId = this.getChangingUserId(); 1560 // Package could be disappearing because it is being blocked, so also check if 1561 // it has been uninstalled. 1562 final boolean uninstalled = isPackageDisappearing(pkg) == PACKAGE_PERMANENT_CHANGE; 1563 if (uninstalled && userId >= 0 && !isPackageInstalled(pkg, userId)) { 1564 cleanAppRestrictionsForPackage(pkg, userId); 1565 } 1566 } 1567 }; 1568 } 1569
