UserManagerService.java revision a6db4ab6193626c880970572a0d03db511d403af
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 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 mUserPackageMonitor.register(mContext, null, UserHandle.ALL, false); 237 userForeground(UserHandle.USER_OWNER); 238 } 239 240 @Override 241 public List<UserInfo> getUsers(boolean excludeDying) { 242 checkManageUsersPermission("query users"); 243 synchronized (mPackagesLock) { 244 ArrayList<UserInfo> users = new ArrayList<UserInfo>(mUsers.size()); 245 for (int i = 0; i < mUsers.size(); i++) { 246 UserInfo ui = mUsers.valueAt(i); 247 if (ui.partial) { 248 continue; 249 } 250 if (!excludeDying || !mRemovingUserIds.get(ui.id)) { 251 users.add(ui); 252 } 253 } 254 return users; 255 } 256 } 257 258 @Override 259 public UserInfo getUserInfo(int userId) { 260 checkManageUsersPermission("query user"); 261 synchronized (mPackagesLock) { 262 return getUserInfoLocked(userId); 263 } 264 } 265 266 @Override 267 public boolean isRestricted() { 268 synchronized (mPackagesLock) { 269 return getUserInfoLocked(UserHandle.getCallingUserId()).isRestricted(); 270 } 271 } 272 273 /* 274 * Should be locked on mUsers before calling this. 275 */ 276 private UserInfo getUserInfoLocked(int userId) { 277 UserInfo ui = mUsers.get(userId); 278 // If it is partial and not in the process of being removed, return as unknown user. 279 if (ui != null && ui.partial && !mRemovingUserIds.get(userId)) { 280 Slog.w(LOG_TAG, "getUserInfo: unknown user #" + userId); 281 return null; 282 } 283 return ui; 284 } 285 286 public boolean exists(int userId) { 287 synchronized (mPackagesLock) { 288 return ArrayUtils.contains(mUserIds, userId); 289 } 290 } 291 292 @Override 293 public void setUserName(int userId, String name) { 294 checkManageUsersPermission("rename users"); 295 boolean changed = false; 296 synchronized (mPackagesLock) { 297 UserInfo info = mUsers.get(userId); 298 if (info == null || info.partial) { 299 Slog.w(LOG_TAG, "setUserName: unknown user #" + userId); 300 return; 301 } 302 if (name != null && !name.equals(info.name)) { 303 info.name = name; 304 writeUserLocked(info); 305 changed = true; 306 } 307 } 308 if (changed) { 309 sendUserInfoChangedBroadcast(userId); 310 } 311 } 312 313 @Override 314 public void setUserIcon(int userId, Bitmap bitmap) { 315 checkManageUsersPermission("update users"); 316 synchronized (mPackagesLock) { 317 UserInfo info = mUsers.get(userId); 318 if (info == null || info.partial) { 319 Slog.w(LOG_TAG, "setUserIcon: unknown user #" + userId); 320 return; 321 } 322 writeBitmapLocked(info, bitmap); 323 writeUserLocked(info); 324 } 325 sendUserInfoChangedBroadcast(userId); 326 } 327 328 private void sendUserInfoChangedBroadcast(int userId) { 329 Intent changedIntent = new Intent(Intent.ACTION_USER_INFO_CHANGED); 330 changedIntent.putExtra(Intent.EXTRA_USER_HANDLE, userId); 331 changedIntent.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY); 332 mContext.sendBroadcastAsUser(changedIntent, UserHandle.ALL); 333 } 334 335 @Override 336 public Bitmap getUserIcon(int userId) { 337 checkManageUsersPermission("read users"); 338 synchronized (mPackagesLock) { 339 UserInfo info = mUsers.get(userId); 340 if (info == null || info.partial) { 341 Slog.w(LOG_TAG, "getUserIcon: unknown user #" + userId); 342 return null; 343 } 344 if (info.iconPath == null) { 345 return null; 346 } 347 return BitmapFactory.decodeFile(info.iconPath); 348 } 349 } 350 351 @Override 352 public void setGuestEnabled(boolean enable) { 353 checkManageUsersPermission("enable guest users"); 354 synchronized (mPackagesLock) { 355 if (mGuestEnabled != enable) { 356 mGuestEnabled = enable; 357 // Erase any guest user that currently exists 358 for (int i = 0; i < mUsers.size(); i++) { 359 UserInfo user = mUsers.valueAt(i); 360 if (!user.partial && user.isGuest()) { 361 if (!enable) { 362 removeUser(user.id); 363 } 364 return; 365 } 366 } 367 // No guest was found 368 if (enable) { 369 createUser("Guest", UserInfo.FLAG_GUEST); 370 } 371 } 372 } 373 } 374 375 @Override 376 public boolean isGuestEnabled() { 377 synchronized (mPackagesLock) { 378 return mGuestEnabled; 379 } 380 } 381 382 @Override 383 public void wipeUser(int userHandle) { 384 checkManageUsersPermission("wipe user"); 385 // TODO: 386 } 387 388 public void makeInitialized(int userId) { 389 checkManageUsersPermission("makeInitialized"); 390 synchronized (mPackagesLock) { 391 UserInfo info = mUsers.get(userId); 392 if (info == null || info.partial) { 393 Slog.w(LOG_TAG, "makeInitialized: unknown user #" + userId); 394 } 395 if ((info.flags&UserInfo.FLAG_INITIALIZED) == 0) { 396 info.flags |= UserInfo.FLAG_INITIALIZED; 397 writeUserLocked(info); 398 } 399 } 400 } 401 402 @Override 403 public Bundle getUserRestrictions(int userId) { 404 // checkManageUsersPermission("getUserRestrictions"); 405 406 synchronized (mPackagesLock) { 407 Bundle restrictions = mUserRestrictions.get(userId); 408 return restrictions != null ? restrictions : Bundle.EMPTY; 409 } 410 } 411 412 @Override 413 public void setUserRestrictions(Bundle restrictions, int userId) { 414 checkManageUsersPermission("setUserRestrictions"); 415 if (restrictions == null) return; 416 417 synchronized (mPackagesLock) { 418 mUserRestrictions.get(userId).clear(); 419 mUserRestrictions.get(userId).putAll(restrictions); 420 writeUserLocked(mUsers.get(userId)); 421 } 422 } 423 424 /** 425 * Check if we've hit the limit of how many users can be created. 426 */ 427 private boolean isUserLimitReachedLocked() { 428 int nUsers = mUsers.size(); 429 return nUsers >= UserManager.getMaxSupportedUsers(); 430 } 431 432 /** 433 * Enforces that only the system UID or root's UID or apps that have the 434 * {@link android.Manifest.permission.MANAGE_USERS MANAGE_USERS} 435 * permission can make certain calls to the UserManager. 436 * 437 * @param message used as message if SecurityException is thrown 438 * @throws SecurityException if the caller is not system or root 439 */ 440 private static final void checkManageUsersPermission(String message) { 441 final int uid = Binder.getCallingUid(); 442 if (uid != Process.SYSTEM_UID && uid != 0 443 && ActivityManager.checkComponentPermission( 444 android.Manifest.permission.MANAGE_USERS, 445 uid, -1, true) != PackageManager.PERMISSION_GRANTED) { 446 throw new SecurityException("You need MANAGE_USERS permission to: " + message); 447 } 448 } 449 450 private void writeBitmapLocked(UserInfo info, Bitmap bitmap) { 451 try { 452 File dir = new File(mUsersDir, Integer.toString(info.id)); 453 File file = new File(dir, USER_PHOTO_FILENAME); 454 if (!dir.exists()) { 455 dir.mkdir(); 456 FileUtils.setPermissions( 457 dir.getPath(), 458 FileUtils.S_IRWXU|FileUtils.S_IRWXG|FileUtils.S_IXOTH, 459 -1, -1); 460 } 461 FileOutputStream os; 462 if (bitmap.compress(Bitmap.CompressFormat.PNG, 100, os = new FileOutputStream(file))) { 463 info.iconPath = file.getAbsolutePath(); 464 } 465 try { 466 os.close(); 467 } catch (IOException ioe) { 468 // What the ... ! 469 } 470 } catch (FileNotFoundException e) { 471 Slog.w(LOG_TAG, "Error setting photo for user ", e); 472 } 473 } 474 475 /** 476 * Returns an array of user ids. This array is cached here for quick access, so do not modify or 477 * cache it elsewhere. 478 * @return the array of user ids. 479 */ 480 public int[] getUserIds() { 481 synchronized (mPackagesLock) { 482 return mUserIds; 483 } 484 } 485 486 int[] getUserIdsLPr() { 487 return mUserIds; 488 } 489 490 private void readUserListLocked() { 491 mGuestEnabled = false; 492 if (!mUserListFile.exists()) { 493 fallbackToSingleUserLocked(); 494 return; 495 } 496 FileInputStream fis = null; 497 AtomicFile userListFile = new AtomicFile(mUserListFile); 498 try { 499 fis = userListFile.openRead(); 500 XmlPullParser parser = Xml.newPullParser(); 501 parser.setInput(fis, null); 502 int type; 503 while ((type = parser.next()) != XmlPullParser.START_TAG 504 && type != XmlPullParser.END_DOCUMENT) { 505 ; 506 } 507 508 if (type != XmlPullParser.START_TAG) { 509 Slog.e(LOG_TAG, "Unable to read user list"); 510 fallbackToSingleUserLocked(); 511 return; 512 } 513 514 mNextSerialNumber = -1; 515 if (parser.getName().equals(TAG_USERS)) { 516 String lastSerialNumber = parser.getAttributeValue(null, ATTR_NEXT_SERIAL_NO); 517 if (lastSerialNumber != null) { 518 mNextSerialNumber = Integer.parseInt(lastSerialNumber); 519 } 520 String versionNumber = parser.getAttributeValue(null, ATTR_USER_VERSION); 521 if (versionNumber != null) { 522 mUserVersion = Integer.parseInt(versionNumber); 523 } 524 } 525 526 while ((type = parser.next()) != XmlPullParser.END_DOCUMENT) { 527 if (type == XmlPullParser.START_TAG && parser.getName().equals(TAG_USER)) { 528 String id = parser.getAttributeValue(null, ATTR_ID); 529 UserInfo user = readUserLocked(Integer.parseInt(id)); 530 531 if (user != null) { 532 mUsers.put(user.id, user); 533 if (user.isGuest()) { 534 mGuestEnabled = true; 535 } 536 if (mNextSerialNumber < 0 || mNextSerialNumber <= user.id) { 537 mNextSerialNumber = user.id + 1; 538 } 539 } 540 } 541 } 542 updateUserIdsLocked(); 543 upgradeIfNecessaryLocked(); 544 } catch (IOException ioe) { 545 fallbackToSingleUserLocked(); 546 } catch (XmlPullParserException pe) { 547 fallbackToSingleUserLocked(); 548 } finally { 549 if (fis != null) { 550 try { 551 fis.close(); 552 } catch (IOException e) { 553 } 554 } 555 } 556 } 557 558 /** 559 * Upgrade steps between versions, either for fixing bugs or changing the data format. 560 */ 561 private void upgradeIfNecessaryLocked() { 562 int userVersion = mUserVersion; 563 if (userVersion < 1) { 564 // Assign a proper name for the owner, if not initialized correctly before 565 UserInfo user = mUsers.get(UserHandle.USER_OWNER); 566 if ("Primary".equals(user.name)) { 567 user.name = mContext.getResources().getString(com.android.internal.R.string.owner_name); 568 writeUserLocked(user); 569 } 570 userVersion = 1; 571 } 572 573 if (userVersion < 2) { 574 // Owner should be marked as initialized 575 UserInfo user = mUsers.get(UserHandle.USER_OWNER); 576 if ((user.flags & UserInfo.FLAG_INITIALIZED) == 0) { 577 user.flags |= UserInfo.FLAG_INITIALIZED; 578 writeUserLocked(user); 579 } 580 userVersion = 2; 581 } 582 583 584 if (userVersion < 4) { 585 userVersion = 4; 586 } 587 588 if (userVersion < USER_VERSION) { 589 Slog.w(LOG_TAG, "User version " + mUserVersion + " didn't upgrade as expected to " 590 + USER_VERSION); 591 } else { 592 mUserVersion = userVersion; 593 writeUserListLocked(); 594 } 595 } 596 597 private void fallbackToSingleUserLocked() { 598 // Create the primary user 599 UserInfo primary = new UserInfo(UserHandle.USER_OWNER, 600 mContext.getResources().getString(com.android.internal.R.string.owner_name), null, 601 UserInfo.FLAG_ADMIN | UserInfo.FLAG_PRIMARY | UserInfo.FLAG_INITIALIZED); 602 mUsers.put(0, primary); 603 mNextSerialNumber = MIN_USER_ID; 604 mUserVersion = USER_VERSION; 605 606 Bundle restrictions = new Bundle(); 607 mUserRestrictions.append(UserHandle.USER_OWNER, restrictions); 608 609 updateUserIdsLocked(); 610 611 writeUserListLocked(); 612 writeUserLocked(primary); 613 } 614 615 /* 616 * Writes the user file in this format: 617 * 618 * <user flags="20039023" id="0"> 619 * <name>Primary</name> 620 * </user> 621 */ 622 private void writeUserLocked(UserInfo userInfo) { 623 FileOutputStream fos = null; 624 AtomicFile userFile = new AtomicFile(new File(mUsersDir, userInfo.id + XML_SUFFIX)); 625 try { 626 fos = userFile.startWrite(); 627 final BufferedOutputStream bos = new BufferedOutputStream(fos); 628 629 // XmlSerializer serializer = XmlUtils.serializerInstance(); 630 final XmlSerializer serializer = new FastXmlSerializer(); 631 serializer.setOutput(bos, "utf-8"); 632 serializer.startDocument(null, true); 633 serializer.setFeature("http://xmlpull.org/v1/doc/features.html#indent-output", true); 634 635 serializer.startTag(null, TAG_USER); 636 serializer.attribute(null, ATTR_ID, Integer.toString(userInfo.id)); 637 serializer.attribute(null, ATTR_SERIAL_NO, Integer.toString(userInfo.serialNumber)); 638 serializer.attribute(null, ATTR_FLAGS, Integer.toString(userInfo.flags)); 639 serializer.attribute(null, ATTR_CREATION_TIME, Long.toString(userInfo.creationTime)); 640 serializer.attribute(null, ATTR_LAST_LOGGED_IN_TIME, 641 Long.toString(userInfo.lastLoggedInTime)); 642 RestrictionsPinState pinState = mRestrictionsPinStates.get(userInfo.id); 643 if (pinState != null) { 644 if (pinState.salt != 0) { 645 serializer.attribute(null, ATTR_SALT, Long.toString(pinState.salt)); 646 } 647 if (pinState.pinHash != null) { 648 serializer.attribute(null, ATTR_PIN_HASH, pinState.pinHash); 649 } 650 if (pinState.failedAttempts != 0) { 651 serializer.attribute(null, ATTR_FAILED_ATTEMPTS, 652 Integer.toString(pinState.failedAttempts)); 653 serializer.attribute(null, ATTR_LAST_RETRY_MS, 654 Long.toString(pinState.lastAttemptTime)); 655 } 656 } 657 if (userInfo.iconPath != null) { 658 serializer.attribute(null, ATTR_ICON_PATH, userInfo.iconPath); 659 } 660 if (userInfo.partial) { 661 serializer.attribute(null, ATTR_PARTIAL, "true"); 662 } 663 664 serializer.startTag(null, TAG_NAME); 665 serializer.text(userInfo.name); 666 serializer.endTag(null, TAG_NAME); 667 668 Bundle restrictions = mUserRestrictions.get(userInfo.id); 669 if (restrictions != null) { 670 serializer.startTag(null, TAG_RESTRICTIONS); 671 writeBoolean(serializer, restrictions, UserManager.DISALLOW_CONFIG_WIFI); 672 writeBoolean(serializer, restrictions, UserManager.DISALLOW_MODIFY_ACCOUNTS); 673 writeBoolean(serializer, restrictions, UserManager.DISALLOW_INSTALL_APPS); 674 writeBoolean(serializer, restrictions, UserManager.DISALLOW_UNINSTALL_APPS); 675 writeBoolean(serializer, restrictions, UserManager.DISALLOW_SHARE_LOCATION); 676 writeBoolean(serializer, restrictions, 677 UserManager.DISALLOW_INSTALL_UNKNOWN_SOURCES); 678 writeBoolean(serializer, restrictions, UserManager.DISALLOW_CONFIG_BLUETOOTH); 679 writeBoolean(serializer, restrictions, UserManager.DISALLOW_USB_FILE_TRANSFER); 680 writeBoolean(serializer, restrictions, UserManager.DISALLOW_CONFIG_CREDENTIALS); 681 writeBoolean(serializer, restrictions, UserManager.DISALLOW_REMOVE_USER); 682 serializer.endTag(null, TAG_RESTRICTIONS); 683 } 684 serializer.endTag(null, TAG_USER); 685 686 serializer.endDocument(); 687 userFile.finishWrite(fos); 688 } catch (Exception ioe) { 689 Slog.e(LOG_TAG, "Error writing user info " + userInfo.id + "\n" + ioe); 690 userFile.failWrite(fos); 691 } 692 } 693 694 /* 695 * Writes the user list file in this format: 696 * 697 * <users nextSerialNumber="3"> 698 * <user id="0"></user> 699 * <user id="2"></user> 700 * </users> 701 */ 702 private void writeUserListLocked() { 703 FileOutputStream fos = null; 704 AtomicFile userListFile = new AtomicFile(mUserListFile); 705 try { 706 fos = userListFile.startWrite(); 707 final BufferedOutputStream bos = new BufferedOutputStream(fos); 708 709 // XmlSerializer serializer = XmlUtils.serializerInstance(); 710 final XmlSerializer serializer = new FastXmlSerializer(); 711 serializer.setOutput(bos, "utf-8"); 712 serializer.startDocument(null, true); 713 serializer.setFeature("http://xmlpull.org/v1/doc/features.html#indent-output", true); 714 715 serializer.startTag(null, TAG_USERS); 716 serializer.attribute(null, ATTR_NEXT_SERIAL_NO, Integer.toString(mNextSerialNumber)); 717 serializer.attribute(null, ATTR_USER_VERSION, Integer.toString(mUserVersion)); 718 719 for (int i = 0; i < mUsers.size(); i++) { 720 UserInfo user = mUsers.valueAt(i); 721 serializer.startTag(null, TAG_USER); 722 serializer.attribute(null, ATTR_ID, Integer.toString(user.id)); 723 serializer.endTag(null, TAG_USER); 724 } 725 726 serializer.endTag(null, TAG_USERS); 727 728 serializer.endDocument(); 729 userListFile.finishWrite(fos); 730 } catch (Exception e) { 731 userListFile.failWrite(fos); 732 Slog.e(LOG_TAG, "Error writing user list"); 733 } 734 } 735 736 private UserInfo readUserLocked(int id) { 737 int flags = 0; 738 int serialNumber = id; 739 String name = null; 740 String iconPath = null; 741 long creationTime = 0L; 742 long lastLoggedInTime = 0L; 743 long salt = 0L; 744 String pinHash = null; 745 int failedAttempts = 0; 746 long lastAttemptTime = 0L; 747 boolean partial = false; 748 Bundle restrictions = new Bundle(); 749 750 FileInputStream fis = null; 751 try { 752 AtomicFile userFile = 753 new AtomicFile(new File(mUsersDir, Integer.toString(id) + XML_SUFFIX)); 754 fis = userFile.openRead(); 755 XmlPullParser parser = Xml.newPullParser(); 756 parser.setInput(fis, null); 757 int type; 758 while ((type = parser.next()) != XmlPullParser.START_TAG 759 && type != XmlPullParser.END_DOCUMENT) { 760 ; 761 } 762 763 if (type != XmlPullParser.START_TAG) { 764 Slog.e(LOG_TAG, "Unable to read user " + id); 765 return null; 766 } 767 768 if (type == XmlPullParser.START_TAG && parser.getName().equals(TAG_USER)) { 769 int storedId = readIntAttribute(parser, ATTR_ID, -1); 770 if (storedId != id) { 771 Slog.e(LOG_TAG, "User id does not match the file name"); 772 return null; 773 } 774 serialNumber = readIntAttribute(parser, ATTR_SERIAL_NO, id); 775 flags = readIntAttribute(parser, ATTR_FLAGS, 0); 776 iconPath = parser.getAttributeValue(null, ATTR_ICON_PATH); 777 creationTime = readLongAttribute(parser, ATTR_CREATION_TIME, 0); 778 lastLoggedInTime = readLongAttribute(parser, ATTR_LAST_LOGGED_IN_TIME, 0); 779 salt = readLongAttribute(parser, ATTR_SALT, 0L); 780 pinHash = parser.getAttributeValue(null, ATTR_PIN_HASH); 781 failedAttempts = readIntAttribute(parser, ATTR_FAILED_ATTEMPTS, 0); 782 lastAttemptTime = readLongAttribute(parser, ATTR_LAST_RETRY_MS, 0L); 783 String valueString = parser.getAttributeValue(null, ATTR_PARTIAL); 784 if ("true".equals(valueString)) { 785 partial = true; 786 } 787 788 int outerDepth = parser.getDepth(); 789 while ((type = parser.next()) != XmlPullParser.END_DOCUMENT 790 && (type != XmlPullParser.END_TAG || parser.getDepth() > outerDepth)) { 791 if (type == XmlPullParser.END_TAG || type == XmlPullParser.TEXT) { 792 continue; 793 } 794 String tag = parser.getName(); 795 if (TAG_NAME.equals(tag)) { 796 type = parser.next(); 797 if (type == XmlPullParser.TEXT) { 798 name = parser.getText(); 799 } 800 } else if (TAG_RESTRICTIONS.equals(tag)) { 801 readBoolean(parser, restrictions, UserManager.DISALLOW_CONFIG_WIFI); 802 readBoolean(parser, restrictions, UserManager.DISALLOW_MODIFY_ACCOUNTS); 803 readBoolean(parser, restrictions, UserManager.DISALLOW_INSTALL_APPS); 804 readBoolean(parser, restrictions, UserManager.DISALLOW_UNINSTALL_APPS); 805 readBoolean(parser, restrictions, UserManager.DISALLOW_SHARE_LOCATION); 806 readBoolean(parser, restrictions, 807 UserManager.DISALLOW_INSTALL_UNKNOWN_SOURCES); 808 readBoolean(parser, restrictions, UserManager.DISALLOW_CONFIG_BLUETOOTH); 809 readBoolean(parser, restrictions, UserManager.DISALLOW_USB_FILE_TRANSFER); 810 readBoolean(parser, restrictions, UserManager.DISALLOW_CONFIG_CREDENTIALS); 811 readBoolean(parser, restrictions, UserManager.DISALLOW_REMOVE_USER); 812 } 813 } 814 } 815 816 UserInfo userInfo = new UserInfo(id, name, iconPath, flags); 817 userInfo.serialNumber = serialNumber; 818 userInfo.creationTime = creationTime; 819 userInfo.lastLoggedInTime = lastLoggedInTime; 820 userInfo.partial = partial; 821 mUserRestrictions.append(id, restrictions); 822 if (salt != 0L) { 823 RestrictionsPinState pinState = mRestrictionsPinStates.get(id); 824 if (pinState == null) { 825 pinState = new RestrictionsPinState(); 826 mRestrictionsPinStates.put(id, pinState); 827 } 828 pinState.salt = salt; 829 pinState.pinHash = pinHash; 830 pinState.failedAttempts = failedAttempts; 831 pinState.lastAttemptTime = lastAttemptTime; 832 } 833 return userInfo; 834 835 } catch (IOException ioe) { 836 } catch (XmlPullParserException pe) { 837 } finally { 838 if (fis != null) { 839 try { 840 fis.close(); 841 } catch (IOException e) { 842 } 843 } 844 } 845 return null; 846 } 847 848 private void readBoolean(XmlPullParser parser, Bundle restrictions, 849 String restrictionKey) { 850 String value = parser.getAttributeValue(null, restrictionKey); 851 if (value != null) { 852 restrictions.putBoolean(restrictionKey, Boolean.parseBoolean(value)); 853 } 854 } 855 856 private void writeBoolean(XmlSerializer xml, Bundle restrictions, String restrictionKey) 857 throws IOException { 858 if (restrictions.containsKey(restrictionKey)) { 859 xml.attribute(null, restrictionKey, 860 Boolean.toString(restrictions.getBoolean(restrictionKey))); 861 } 862 } 863 864 private int readIntAttribute(XmlPullParser parser, String attr, int defaultValue) { 865 String valueString = parser.getAttributeValue(null, attr); 866 if (valueString == null) return defaultValue; 867 try { 868 return Integer.parseInt(valueString); 869 } catch (NumberFormatException nfe) { 870 return defaultValue; 871 } 872 } 873 874 private long readLongAttribute(XmlPullParser parser, String attr, long defaultValue) { 875 String valueString = parser.getAttributeValue(null, attr); 876 if (valueString == null) return defaultValue; 877 try { 878 return Long.parseLong(valueString); 879 } catch (NumberFormatException nfe) { 880 return defaultValue; 881 } 882 } 883 884 private boolean isPackageInstalled(String pkg, int userId) { 885 final ApplicationInfo info = mPm.getApplicationInfo(pkg, 886 PackageManager.GET_UNINSTALLED_PACKAGES, 887 userId); 888 if (info == null || (info.flags&ApplicationInfo.FLAG_INSTALLED) == 0) { 889 return false; 890 } 891 return true; 892 } 893 894 /** 895 * Removes all the restrictions files (res_<packagename>) for a given user, if all is true, 896 * else removes only those packages that have been uninstalled. 897 * Does not do any permissions checking. 898 */ 899 private void cleanAppRestrictions(int userId, boolean all) { 900 synchronized (mPackagesLock) { 901 File dir = Environment.getUserSystemDirectory(userId); 902 String[] files = dir.list(); 903 if (files == null) return; 904 for (String fileName : files) { 905 if (fileName.startsWith(RESTRICTIONS_FILE_PREFIX)) { 906 File resFile = new File(dir, fileName); 907 if (resFile.exists()) { 908 if (all) { 909 resFile.delete(); 910 } else { 911 String pkg = restrictionsFileNameToPackage(fileName); 912 if (!isPackageInstalled(pkg, userId)) { 913 resFile.delete(); 914 } 915 } 916 } 917 } 918 } 919 } 920 } 921 922 /** 923 * Removes the app restrictions file for a specific package and user id, if it exists. 924 */ 925 private void cleanAppRestrictionsForPackage(String pkg, int userId) { 926 synchronized (mPackagesLock) { 927 File dir = Environment.getUserSystemDirectory(userId); 928 File resFile = new File(dir, packageToRestrictionsFileName(pkg)); 929 if (resFile.exists()) { 930 resFile.delete(); 931 } 932 } 933 } 934 935 @Override 936 public UserInfo createUser(String name, int flags) { 937 checkManageUsersPermission("Only the system can create users"); 938 939 final long ident = Binder.clearCallingIdentity(); 940 final UserInfo userInfo; 941 try { 942 synchronized (mInstallLock) { 943 synchronized (mPackagesLock) { 944 if (isUserLimitReachedLocked()) return null; 945 int userId = getNextAvailableIdLocked(); 946 userInfo = new UserInfo(userId, name, null, flags); 947 File userPath = new File(mBaseUserPath, Integer.toString(userId)); 948 userInfo.serialNumber = mNextSerialNumber++; 949 long now = System.currentTimeMillis(); 950 userInfo.creationTime = (now > EPOCH_PLUS_30_YEARS) ? now : 0; 951 userInfo.partial = true; 952 Environment.getUserSystemDirectory(userInfo.id).mkdirs(); 953 mUsers.put(userId, userInfo); 954 writeUserListLocked(); 955 writeUserLocked(userInfo); 956 mPm.createNewUserLILPw(userId, userPath); 957 userInfo.partial = false; 958 writeUserLocked(userInfo); 959 updateUserIdsLocked(); 960 Bundle restrictions = new Bundle(); 961 mUserRestrictions.append(userId, restrictions); 962 } 963 } 964 if (userInfo != null) { 965 Intent addedIntent = new Intent(Intent.ACTION_USER_ADDED); 966 addedIntent.putExtra(Intent.EXTRA_USER_HANDLE, userInfo.id); 967 mContext.sendBroadcastAsUser(addedIntent, UserHandle.ALL, 968 android.Manifest.permission.MANAGE_USERS); 969 } 970 } finally { 971 Binder.restoreCallingIdentity(ident); 972 } 973 return userInfo; 974 } 975 976 /** 977 * Removes a user and all data directories created for that user. This method should be called 978 * after the user's processes have been terminated. 979 * @param id the user's id 980 */ 981 public boolean removeUser(int userHandle) { 982 checkManageUsersPermission("Only the system can remove users"); 983 final UserInfo user; 984 synchronized (mPackagesLock) { 985 user = mUsers.get(userHandle); 986 if (userHandle == 0 || user == null) { 987 return false; 988 } 989 mRemovingUserIds.put(userHandle, true); 990 // Set this to a partially created user, so that the user will be purged 991 // on next startup, in case the runtime stops now before stopping and 992 // removing the user completely. 993 user.partial = true; 994 writeUserLocked(user); 995 } 996 if (DBG) Slog.i(LOG_TAG, "Stopping user " + userHandle); 997 int res; 998 try { 999 res = ActivityManagerNative.getDefault().stopUser(userHandle, 1000 new IStopUserCallback.Stub() { 1001 @Override 1002 public void userStopped(int userId) { 1003 finishRemoveUser(userId); 1004 } 1005 @Override 1006 public void userStopAborted(int userId) { 1007 } 1008 }); 1009 } catch (RemoteException e) { 1010 return false; 1011 } 1012 1013 return res == ActivityManager.USER_OP_SUCCESS; 1014 } 1015 1016 void finishRemoveUser(final int userHandle) { 1017 if (DBG) Slog.i(LOG_TAG, "finishRemoveUser " + userHandle); 1018 // Let other services shutdown any activity and clean up their state before completely 1019 // wiping the user's system directory and removing from the user list 1020 long ident = Binder.clearCallingIdentity(); 1021 try { 1022 Intent addedIntent = new Intent(Intent.ACTION_USER_REMOVED); 1023 addedIntent.putExtra(Intent.EXTRA_USER_HANDLE, userHandle); 1024 mContext.sendOrderedBroadcastAsUser(addedIntent, UserHandle.ALL, 1025 android.Manifest.permission.MANAGE_USERS, 1026 1027 new BroadcastReceiver() { 1028 @Override 1029 public void onReceive(Context context, Intent intent) { 1030 if (DBG) { 1031 Slog.i(LOG_TAG, 1032 "USER_REMOVED broadcast sent, cleaning up user data " 1033 + userHandle); 1034 } 1035 new Thread() { 1036 public void run() { 1037 synchronized (mInstallLock) { 1038 synchronized (mPackagesLock) { 1039 removeUserStateLocked(userHandle); 1040 } 1041 } 1042 } 1043 }.start(); 1044 } 1045 }, 1046 1047 null, Activity.RESULT_OK, null, null); 1048 } finally { 1049 Binder.restoreCallingIdentity(ident); 1050 } 1051 } 1052 1053 private void removeUserStateLocked(final int userHandle) { 1054 // Cleanup package manager settings 1055 mPm.cleanUpUserLILPw(userHandle); 1056 1057 // Remove this user from the list 1058 mUsers.remove(userHandle); 1059 1060 // Have user ID linger for several seconds to let external storage VFS 1061 // cache entries expire. This must be greater than the 'entry_valid' 1062 // timeout used by the FUSE daemon. 1063 mHandler.postDelayed(new Runnable() { 1064 @Override 1065 public void run() { 1066 synchronized (mPackagesLock) { 1067 mRemovingUserIds.delete(userHandle); 1068 } 1069 } 1070 }, MINUTE_IN_MILLIS); 1071 1072 mRestrictionsPinStates.remove(userHandle); 1073 // Remove user file 1074 AtomicFile userFile = new AtomicFile(new File(mUsersDir, userHandle + XML_SUFFIX)); 1075 userFile.delete(); 1076 // Update the user list 1077 writeUserListLocked(); 1078 updateUserIdsLocked(); 1079 removeDirectoryRecursive(Environment.getUserSystemDirectory(userHandle)); 1080 } 1081 1082 private void removeDirectoryRecursive(File parent) { 1083 if (parent.isDirectory()) { 1084 String[] files = parent.list(); 1085 for (String filename : files) { 1086 File child = new File(parent, filename); 1087 removeDirectoryRecursive(child); 1088 } 1089 } 1090 parent.delete(); 1091 } 1092 1093 @Override 1094 public Bundle getApplicationRestrictions(String packageName) { 1095 return getApplicationRestrictionsForUser(packageName, UserHandle.getCallingUserId()); 1096 } 1097 1098 @Override 1099 public Bundle getApplicationRestrictionsForUser(String packageName, int userId) { 1100 if (UserHandle.getCallingUserId() != userId 1101 || !UserHandle.isSameApp(Binder.getCallingUid(), getUidForPackage(packageName))) { 1102 checkManageUsersPermission("Only system can get restrictions for other users/apps"); 1103 } 1104 synchronized (mPackagesLock) { 1105 // Read the restrictions from XML 1106 return readApplicationRestrictionsLocked(packageName, userId); 1107 } 1108 } 1109 1110 @Override 1111 public void setApplicationRestrictions(String packageName, Bundle restrictions, 1112 int userId) { 1113 if (UserHandle.getCallingUserId() != userId 1114 || !UserHandle.isSameApp(Binder.getCallingUid(), getUidForPackage(packageName))) { 1115 checkManageUsersPermission("Only system can set restrictions for other users/apps"); 1116 } 1117 synchronized (mPackagesLock) { 1118 // Write the restrictions to XML 1119 writeApplicationRestrictionsLocked(packageName, restrictions, userId); 1120 } 1121 } 1122 1123 @Override 1124 public boolean setRestrictionsChallenge(String newPin) { 1125 checkManageUsersPermission("Only system can modify the restrictions pin"); 1126 int userId = UserHandle.getCallingUserId(); 1127 synchronized (mPackagesLock) { 1128 RestrictionsPinState pinState = mRestrictionsPinStates.get(userId); 1129 if (pinState == null) { 1130 pinState = new RestrictionsPinState(); 1131 } 1132 if (newPin == null) { 1133 pinState.salt = 0; 1134 pinState.pinHash = null; 1135 } else { 1136 try { 1137 pinState.salt = SecureRandom.getInstance("SHA1PRNG").nextLong(); 1138 } catch (NoSuchAlgorithmException e) { 1139 pinState.salt = (long) (Math.random() * Long.MAX_VALUE); 1140 } 1141 pinState.pinHash = passwordToHash(newPin, pinState.salt); 1142 pinState.failedAttempts = 0; 1143 } 1144 mRestrictionsPinStates.put(userId, pinState); 1145 writeUserLocked(mUsers.get(userId)); 1146 } 1147 return true; 1148 } 1149 1150 @Override 1151 public int checkRestrictionsChallenge(String pin) { 1152 checkManageUsersPermission("Only system can verify the restrictions pin"); 1153 int userId = UserHandle.getCallingUserId(); 1154 synchronized (mPackagesLock) { 1155 RestrictionsPinState pinState = mRestrictionsPinStates.get(userId); 1156 // If there's no pin set, return error code 1157 if (pinState == null || pinState.salt == 0 || pinState.pinHash == null) { 1158 return UserManager.PIN_VERIFICATION_FAILED_NOT_SET; 1159 } else if (pin == null) { 1160 // If just checking if user can be prompted, return remaining time 1161 int waitTime = getRemainingTimeForPinAttempt(pinState); 1162 Slog.d(LOG_TAG, "Remaining waittime peek=" + waitTime); 1163 return waitTime; 1164 } else { 1165 int waitTime = getRemainingTimeForPinAttempt(pinState); 1166 Slog.d(LOG_TAG, "Remaining waittime=" + waitTime); 1167 if (waitTime > 0) { 1168 return waitTime; 1169 } 1170 if (passwordToHash(pin, pinState.salt).equals(pinState.pinHash)) { 1171 pinState.failedAttempts = 0; 1172 writeUserLocked(mUsers.get(userId)); 1173 return UserManager.PIN_VERIFICATION_SUCCESS; 1174 } else { 1175 pinState.failedAttempts++; 1176 pinState.lastAttemptTime = System.currentTimeMillis(); 1177 writeUserLocked(mUsers.get(userId)); 1178 return waitTime; 1179 } 1180 } 1181 } 1182 } 1183 1184 private int getRemainingTimeForPinAttempt(RestrictionsPinState pinState) { 1185 int backoffIndex = Math.min(pinState.failedAttempts / BACKOFF_INC_INTERVAL, 1186 BACKOFF_TIMES.length - 1); 1187 int backoffTime = (pinState.failedAttempts % BACKOFF_INC_INTERVAL) == 0 ? 1188 BACKOFF_TIMES[backoffIndex] : 0; 1189 return (int) Math.max(backoffTime + pinState.lastAttemptTime - System.currentTimeMillis(), 1190 0); 1191 } 1192 1193 @Override 1194 public boolean hasRestrictionsChallenge() { 1195 int userId = UserHandle.getCallingUserId(); 1196 synchronized (mPackagesLock) { 1197 return hasRestrictionsPinLocked(userId); 1198 } 1199 } 1200 1201 private boolean hasRestrictionsPinLocked(int userId) { 1202 RestrictionsPinState pinState = mRestrictionsPinStates.get(userId); 1203 if (pinState == null || pinState.salt == 0 || pinState.pinHash == null) { 1204 return false; 1205 } 1206 return true; 1207 } 1208 1209 @Override 1210 public void removeRestrictions() { 1211 checkManageUsersPermission("Only system can remove restrictions"); 1212 final int userHandle = UserHandle.getCallingUserId(); 1213 removeRestrictionsForUser(userHandle, true); 1214 } 1215 1216 private void removeRestrictionsForUser(final int userHandle, boolean unblockApps) { 1217 synchronized (mPackagesLock) { 1218 // Remove all user restrictions 1219 setUserRestrictions(new Bundle(), userHandle); 1220 // Remove restrictions pin 1221 setRestrictionsChallenge(null); 1222 // Remove any app restrictions 1223 cleanAppRestrictions(userHandle, true); 1224 } 1225 if (unblockApps) { 1226 unblockAllAppsForUser(userHandle); 1227 } 1228 } 1229 1230 private void unblockAllAppsForUser(final int userHandle) { 1231 mHandler.post(new Runnable() { 1232 @Override 1233 public void run() { 1234 List<ApplicationInfo> apps = 1235 mPm.getInstalledApplications(PackageManager.GET_UNINSTALLED_PACKAGES, 1236 userHandle).getList(); 1237 final long ident = Binder.clearCallingIdentity(); 1238 try { 1239 for (ApplicationInfo appInfo : apps) { 1240 if ((appInfo.flags & ApplicationInfo.FLAG_INSTALLED) != 0 1241 && (appInfo.flags & ApplicationInfo.FLAG_BLOCKED) != 0) { 1242 mPm.setApplicationBlockedSettingAsUser(appInfo.packageName, false, 1243 userHandle); 1244 } 1245 } 1246 } finally { 1247 Binder.restoreCallingIdentity(ident); 1248 } 1249 } 1250 }); 1251 } 1252 1253 /* 1254 * Generate a hash for the given password. To avoid brute force attacks, we use a salted hash. 1255 * Not the most secure, but it is at least a second level of protection. First level is that 1256 * the file is in a location only readable by the system process. 1257 * @param password the password. 1258 * @param salt the randomly generated salt 1259 * @return the hash of the pattern in a String. 1260 */ 1261 private String passwordToHash(String password, long salt) { 1262 if (password == null) { 1263 return null; 1264 } 1265 String algo = null; 1266 String hashed = salt + password; 1267 try { 1268 byte[] saltedPassword = (password + salt).getBytes(); 1269 byte[] sha1 = MessageDigest.getInstance(algo = "SHA-1").digest(saltedPassword); 1270 byte[] md5 = MessageDigest.getInstance(algo = "MD5").digest(saltedPassword); 1271 hashed = toHex(sha1) + toHex(md5); 1272 } catch (NoSuchAlgorithmException e) { 1273 Log.w(LOG_TAG, "Failed to encode string because of missing algorithm: " + algo); 1274 } 1275 return hashed; 1276 } 1277 1278 private static String toHex(byte[] ary) { 1279 final String hex = "0123456789ABCDEF"; 1280 String ret = ""; 1281 for (int i = 0; i < ary.length; i++) { 1282 ret += hex.charAt((ary[i] >> 4) & 0xf); 1283 ret += hex.charAt(ary[i] & 0xf); 1284 } 1285 return ret; 1286 } 1287 1288 private int getUidForPackage(String packageName) { 1289 long ident = Binder.clearCallingIdentity(); 1290 try { 1291 return mContext.getPackageManager().getApplicationInfo(packageName, 1292 PackageManager.GET_UNINSTALLED_PACKAGES).uid; 1293 } catch (NameNotFoundException nnfe) { 1294 return -1; 1295 } finally { 1296 Binder.restoreCallingIdentity(ident); 1297 } 1298 } 1299 1300 private Bundle readApplicationRestrictionsLocked(String packageName, 1301 int userId) { 1302 final Bundle restrictions = new Bundle(); 1303 final ArrayList<String> values = new ArrayList<String>(); 1304 1305 FileInputStream fis = null; 1306 try { 1307 AtomicFile restrictionsFile = 1308 new AtomicFile(new File(Environment.getUserSystemDirectory(userId), 1309 packageToRestrictionsFileName(packageName))); 1310 fis = restrictionsFile.openRead(); 1311 XmlPullParser parser = Xml.newPullParser(); 1312 parser.setInput(fis, null); 1313 int type; 1314 while ((type = parser.next()) != XmlPullParser.START_TAG 1315 && type != XmlPullParser.END_DOCUMENT) { 1316 ; 1317 } 1318 1319 if (type != XmlPullParser.START_TAG) { 1320 Slog.e(LOG_TAG, "Unable to read restrictions file " 1321 + restrictionsFile.getBaseFile()); 1322 return restrictions; 1323 } 1324 1325 while ((type = parser.next()) != XmlPullParser.END_DOCUMENT) { 1326 if (type == XmlPullParser.START_TAG && parser.getName().equals(TAG_ENTRY)) { 1327 String key = parser.getAttributeValue(null, ATTR_KEY); 1328 String valType = parser.getAttributeValue(null, ATTR_VALUE_TYPE); 1329 String multiple = parser.getAttributeValue(null, ATTR_MULTIPLE); 1330 if (multiple != null) { 1331 int count = Integer.parseInt(multiple); 1332 while (count > 0 && (type = parser.next()) != XmlPullParser.END_DOCUMENT) { 1333 if (type == XmlPullParser.START_TAG 1334 && parser.getName().equals(TAG_VALUE)) { 1335 values.add(parser.nextText().trim()); 1336 count--; 1337 } 1338 } 1339 String [] valueStrings = new String[values.size()]; 1340 values.toArray(valueStrings); 1341 restrictions.putStringArray(key, valueStrings); 1342 } else if (ATTR_TYPE_BOOLEAN.equals(valType)) { 1343 restrictions.putBoolean(key, Boolean.parseBoolean( 1344 parser.nextText().trim())); 1345 } else { 1346 String value = parser.nextText().trim(); 1347 restrictions.putString(key, value); 1348 } 1349 } 1350 } 1351 1352 } catch (IOException ioe) { 1353 } catch (XmlPullParserException pe) { 1354 } finally { 1355 if (fis != null) { 1356 try { 1357 fis.close(); 1358 } catch (IOException e) { 1359 } 1360 } 1361 } 1362 return restrictions; 1363 } 1364 1365 private void writeApplicationRestrictionsLocked(String packageName, 1366 Bundle restrictions, int userId) { 1367 FileOutputStream fos = null; 1368 AtomicFile restrictionsFile = new AtomicFile( 1369 new File(Environment.getUserSystemDirectory(userId), 1370 packageToRestrictionsFileName(packageName))); 1371 try { 1372 fos = restrictionsFile.startWrite(); 1373 final BufferedOutputStream bos = new BufferedOutputStream(fos); 1374 1375 // XmlSerializer serializer = XmlUtils.serializerInstance(); 1376 final XmlSerializer serializer = new FastXmlSerializer(); 1377 serializer.setOutput(bos, "utf-8"); 1378 serializer.startDocument(null, true); 1379 serializer.setFeature("http://xmlpull.org/v1/doc/features.html#indent-output", true); 1380 1381 serializer.startTag(null, TAG_RESTRICTIONS); 1382 1383 for (String key : restrictions.keySet()) { 1384 Object value = restrictions.get(key); 1385 serializer.startTag(null, TAG_ENTRY); 1386 serializer.attribute(null, ATTR_KEY, key); 1387 1388 if (value instanceof Boolean) { 1389 serializer.attribute(null, ATTR_VALUE_TYPE, ATTR_TYPE_BOOLEAN); 1390 serializer.text(value.toString()); 1391 } else if (value == null || value instanceof String) { 1392 serializer.attribute(null, ATTR_VALUE_TYPE, ATTR_TYPE_STRING); 1393 serializer.text(value != null ? (String) value : ""); 1394 } else { 1395 serializer.attribute(null, ATTR_VALUE_TYPE, ATTR_TYPE_STRING_ARRAY); 1396 String[] values = (String[]) value; 1397 serializer.attribute(null, ATTR_MULTIPLE, Integer.toString(values.length)); 1398 for (String choice : values) { 1399 serializer.startTag(null, TAG_VALUE); 1400 serializer.text(choice != null ? choice : ""); 1401 serializer.endTag(null, TAG_VALUE); 1402 } 1403 } 1404 serializer.endTag(null, TAG_ENTRY); 1405 } 1406 1407 serializer.endTag(null, TAG_RESTRICTIONS); 1408 1409 serializer.endDocument(); 1410 restrictionsFile.finishWrite(fos); 1411 } catch (Exception e) { 1412 restrictionsFile.failWrite(fos); 1413 Slog.e(LOG_TAG, "Error writing application restrictions list"); 1414 } 1415 } 1416 1417 @Override 1418 public int getUserSerialNumber(int userHandle) { 1419 synchronized (mPackagesLock) { 1420 if (!exists(userHandle)) return -1; 1421 return getUserInfoLocked(userHandle).serialNumber; 1422 } 1423 } 1424 1425 @Override 1426 public int getUserHandle(int userSerialNumber) { 1427 synchronized (mPackagesLock) { 1428 for (int userId : mUserIds) { 1429 if (getUserInfoLocked(userId).serialNumber == userSerialNumber) return userId; 1430 } 1431 // Not found 1432 return -1; 1433 } 1434 } 1435 1436 /** 1437 * Caches the list of user ids in an array, adjusting the array size when necessary. 1438 */ 1439 private void updateUserIdsLocked() { 1440 int num = 0; 1441 for (int i = 0; i < mUsers.size(); i++) { 1442 if (!mUsers.valueAt(i).partial) { 1443 num++; 1444 } 1445 } 1446 final int[] newUsers = new int[num]; 1447 int n = 0; 1448 for (int i = 0; i < mUsers.size(); i++) { 1449 if (!mUsers.valueAt(i).partial) { 1450 newUsers[n++] = mUsers.keyAt(i); 1451 } 1452 } 1453 mUserIds = newUsers; 1454 } 1455 1456 /** 1457 * Make a note of the last started time of a user and do some cleanup. 1458 * @param userId the user that was just foregrounded 1459 */ 1460 public void userForeground(int userId) { 1461 synchronized (mPackagesLock) { 1462 UserInfo user = mUsers.get(userId); 1463 long now = System.currentTimeMillis(); 1464 if (user == null || user.partial) { 1465 Slog.w(LOG_TAG, "userForeground: unknown user #" + userId); 1466 return; 1467 } 1468 if (now > EPOCH_PLUS_30_YEARS) { 1469 user.lastLoggedInTime = now; 1470 writeUserLocked(user); 1471 } 1472 // If this is not a restricted profile and there is no restrictions pin, clean up 1473 // all restrictions files that might have been left behind, else clean up just the 1474 // ones with uninstalled packages 1475 RestrictionsPinState pinState = mRestrictionsPinStates.get(userId); 1476 final long salt = pinState == null ? 0 : pinState.salt; 1477 cleanAppRestrictions(userId, (!user.isRestricted() && salt == 0)); 1478 } 1479 } 1480 1481 /** 1482 * Returns the next available user id, filling in any holes in the ids. 1483 * TODO: May not be a good idea to recycle ids, in case it results in confusion 1484 * for data and battery stats collection, or unexpected cross-talk. 1485 * @return 1486 */ 1487 private int getNextAvailableIdLocked() { 1488 synchronized (mPackagesLock) { 1489 int i = MIN_USER_ID; 1490 while (i < Integer.MAX_VALUE) { 1491 if (mUsers.indexOfKey(i) < 0 && !mRemovingUserIds.get(i)) { 1492 break; 1493 } 1494 i++; 1495 } 1496 return i; 1497 } 1498 } 1499 1500 private String packageToRestrictionsFileName(String packageName) { 1501 return RESTRICTIONS_FILE_PREFIX + packageName + XML_SUFFIX; 1502 } 1503 1504 private String restrictionsFileNameToPackage(String fileName) { 1505 return fileName.substring(RESTRICTIONS_FILE_PREFIX.length(), 1506 (int) (fileName.length() - XML_SUFFIX.length())); 1507 } 1508 1509 @Override 1510 protected void dump(FileDescriptor fd, PrintWriter pw, String[] args) { 1511 if (mContext.checkCallingOrSelfPermission(android.Manifest.permission.DUMP) 1512 != PackageManager.PERMISSION_GRANTED) { 1513 pw.println("Permission Denial: can't dump UserManager from from pid=" 1514 + Binder.getCallingPid() 1515 + ", uid=" + Binder.getCallingUid() 1516 + " without permission " 1517 + android.Manifest.permission.DUMP); 1518 return; 1519 } 1520 1521 long now = System.currentTimeMillis(); 1522 StringBuilder sb = new StringBuilder(); 1523 synchronized (mPackagesLock) { 1524 pw.println("Users:"); 1525 for (int i = 0; i < mUsers.size(); i++) { 1526 UserInfo user = mUsers.valueAt(i); 1527 if (user == null) continue; 1528 pw.print(" "); pw.print(user); pw.print(" serialNo="); pw.print(user.serialNumber); 1529 if (mRemovingUserIds.get(mUsers.keyAt(i))) pw.print(" <removing> "); 1530 if (user.partial) pw.print(" <partial>"); 1531 pw.println(); 1532 pw.print(" Created: "); 1533 if (user.creationTime == 0) { 1534 pw.println("<unknown>"); 1535 } else { 1536 sb.setLength(0); 1537 TimeUtils.formatDuration(now - user.creationTime, sb); 1538 sb.append(" ago"); 1539 pw.println(sb); 1540 } 1541 pw.print(" Last logged in: "); 1542 if (user.lastLoggedInTime == 0) { 1543 pw.println("<unknown>"); 1544 } else { 1545 sb.setLength(0); 1546 TimeUtils.formatDuration(now - user.lastLoggedInTime, sb); 1547 sb.append(" ago"); 1548 pw.println(sb); 1549 } 1550 } 1551 } 1552 } 1553 1554 private PackageMonitor mUserPackageMonitor = new PackageMonitor() { 1555 @Override 1556 public void onPackageRemoved(String pkg, int uid) { 1557 final int userId = this.getChangingUserId(); 1558 // Package could be disappearing because it is being blocked, so also check if 1559 // it has been uninstalled. 1560 final boolean uninstalled = isPackageDisappearing(pkg) == PACKAGE_PERMANENT_CHANGE; 1561 if (uninstalled && userId >= 0 && !isPackageInstalled(pkg, userId)) { 1562 cleanAppRestrictionsForPackage(pkg, userId); 1563 } 1564 } 1565 }; 1566} 1567