UserManagerService.java revision 7a2b4d11c741de8b78570c0e11f49deb165e35da
1/* 2 * Copyright (C) 2011 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17package com.android.server.pm; 18 19import static android.text.format.DateUtils.MINUTE_IN_MILLIS; 20 21import android.app.Activity; 22import android.app.ActivityManager; 23import android.app.ActivityManagerNative; 24import android.app.ActivityThread; 25import android.app.admin.DevicePolicyManager; 26import android.app.IStopUserCallback; 27import android.content.BroadcastReceiver; 28import android.content.Context; 29import android.content.Intent; 30import android.content.pm.ApplicationInfo; 31import android.content.pm.PackageManager; 32import android.content.pm.PackageManager.NameNotFoundException; 33import android.content.pm.UserInfo; 34import android.graphics.Bitmap; 35import android.graphics.BitmapFactory; 36import android.os.Binder; 37import android.os.Bundle; 38import android.os.Environment; 39import android.os.FileUtils; 40import android.os.Handler; 41import android.os.IUserManager; 42import android.os.Process; 43import android.os.RemoteException; 44import android.os.UserHandle; 45import android.os.UserManager; 46import android.util.AtomicFile; 47import android.util.Log; 48import android.util.Slog; 49import android.util.SparseArray; 50import android.util.SparseBooleanArray; 51import android.util.TimeUtils; 52import android.util.Xml; 53 54import com.android.internal.content.PackageMonitor; 55import com.android.internal.util.ArrayUtils; 56import com.android.internal.util.FastXmlSerializer; 57 58import org.xmlpull.v1.XmlPullParser; 59import org.xmlpull.v1.XmlPullParserException; 60import org.xmlpull.v1.XmlSerializer; 61 62import java.io.BufferedOutputStream; 63import java.io.File; 64import java.io.FileDescriptor; 65import java.io.FileInputStream; 66import java.io.FileNotFoundException; 67import java.io.FileOutputStream; 68import java.io.IOException; 69import java.io.PrintWriter; 70import java.security.MessageDigest; 71import java.security.NoSuchAlgorithmException; 72import java.security.SecureRandom; 73import java.util.ArrayList; 74import java.util.List; 75 76public class UserManagerService extends IUserManager.Stub { 77 78 private static final String LOG_TAG = "UserManagerService"; 79 80 private static final boolean DBG = false; 81 82 private static final String TAG_NAME = "name"; 83 private static final String ATTR_FLAGS = "flags"; 84 private static final String ATTR_ICON_PATH = "icon"; 85 private static final String ATTR_ID = "id"; 86 private static final String ATTR_CREATION_TIME = "created"; 87 private static final String ATTR_LAST_LOGGED_IN_TIME = "lastLoggedIn"; 88 private static final String ATTR_SALT = "salt"; 89 private static final String ATTR_PIN_HASH = "pinHash"; 90 private static final String ATTR_FAILED_ATTEMPTS = "failedAttempts"; 91 private static final String ATTR_LAST_RETRY_MS = "lastAttemptMs"; 92 private static final String ATTR_SERIAL_NO = "serialNumber"; 93 private static final String ATTR_NEXT_SERIAL_NO = "nextSerialNumber"; 94 private static final String ATTR_PARTIAL = "partial"; 95 private static final String ATTR_USER_VERSION = "version"; 96 private static final String ATTR_PROFILE_GROUP_ID = "profileGroupId"; 97 private static final String TAG_USERS = "users"; 98 private static final String TAG_USER = "user"; 99 private static final String TAG_RESTRICTIONS = "restrictions"; 100 private static final String TAG_ENTRY = "entry"; 101 private static final String TAG_VALUE = "value"; 102 private static final String ATTR_KEY = "key"; 103 private static final String ATTR_VALUE_TYPE = "type"; 104 private static final String ATTR_MULTIPLE = "m"; 105 106 private static final String ATTR_TYPE_STRING_ARRAY = "sa"; 107 private static final String ATTR_TYPE_STRING = "s"; 108 private static final String ATTR_TYPE_BOOLEAN = "b"; 109 110 private static final String USER_INFO_DIR = "system" + File.separator + "users"; 111 private static final String USER_LIST_FILENAME = "userlist.xml"; 112 private static final String USER_PHOTO_FILENAME = "photo.png"; 113 114 private static final String RESTRICTIONS_FILE_PREFIX = "res_"; 115 private static final String XML_SUFFIX = ".xml"; 116 117 private static final int MIN_USER_ID = 10; 118 119 private static final int USER_VERSION = 4; 120 121 private static final long EPOCH_PLUS_30_YEARS = 30L * 365 * 24 * 60 * 60 * 1000L; // ms 122 123 // Number of attempts before jumping to the next BACKOFF_TIMES slot 124 private static final int BACKOFF_INC_INTERVAL = 5; 125 126 // Amount of time to force the user to wait before entering the PIN again, after failing 127 // BACKOFF_INC_INTERVAL times. 128 private static final int[] BACKOFF_TIMES = { 0, 30*1000, 60*1000, 5*60*1000, 30*60*1000 }; 129 130 private final Context mContext; 131 private final PackageManagerService mPm; 132 private final Object mInstallLock; 133 private final Object mPackagesLock; 134 135 private final Handler mHandler; 136 137 private final File mUsersDir; 138 private final File mUserListFile; 139 private final File mBaseUserPath; 140 141 private final SparseArray<UserInfo> mUsers = new SparseArray<UserInfo>(); 142 private final SparseArray<Bundle> mUserRestrictions = new SparseArray<Bundle>(); 143 144 class RestrictionsPinState { 145 long salt; 146 String pinHash; 147 int failedAttempts; 148 long lastAttemptTime; 149 } 150 151 private final SparseArray<RestrictionsPinState> mRestrictionsPinStates = 152 new SparseArray<RestrictionsPinState>(); 153 154 /** 155 * Set of user IDs being actively removed. Removed IDs linger in this set 156 * for several seconds to work around a VFS caching issue. 157 */ 158 // @GuardedBy("mPackagesLock") 159 private final SparseBooleanArray mRemovingUserIds = new SparseBooleanArray(); 160 161 private int[] mUserIds; 162 private boolean mGuestEnabled; 163 private int mNextSerialNumber; 164 private int mUserVersion = 0; 165 166 private static UserManagerService sInstance; 167 168 public static UserManagerService getInstance() { 169 synchronized (UserManagerService.class) { 170 return sInstance; 171 } 172 } 173 174 /** 175 * Available for testing purposes. 176 */ 177 UserManagerService(File dataDir, File baseUserPath) { 178 this(null, null, new Object(), new Object(), dataDir, baseUserPath); 179 } 180 181 /** 182 * Called by package manager to create the service. This is closely 183 * associated with the package manager, and the given lock is the 184 * package manager's own lock. 185 */ 186 UserManagerService(Context context, PackageManagerService pm, 187 Object installLock, Object packagesLock) { 188 this(context, pm, installLock, packagesLock, 189 Environment.getDataDirectory(), 190 new File(Environment.getDataDirectory(), "user")); 191 } 192 193 /** 194 * Available for testing purposes. 195 */ 196 private UserManagerService(Context context, PackageManagerService pm, 197 Object installLock, Object packagesLock, 198 File dataDir, File baseUserPath) { 199 mContext = context; 200 mPm = pm; 201 mInstallLock = installLock; 202 mPackagesLock = packagesLock; 203 mHandler = new Handler(); 204 synchronized (mInstallLock) { 205 synchronized (mPackagesLock) { 206 mUsersDir = new File(dataDir, USER_INFO_DIR); 207 mUsersDir.mkdirs(); 208 // Make zeroth user directory, for services to migrate their files to that location 209 File userZeroDir = new File(mUsersDir, "0"); 210 userZeroDir.mkdirs(); 211 mBaseUserPath = baseUserPath; 212 FileUtils.setPermissions(mUsersDir.toString(), 213 FileUtils.S_IRWXU|FileUtils.S_IRWXG 214 |FileUtils.S_IROTH|FileUtils.S_IXOTH, 215 -1, -1); 216 mUserListFile = new File(mUsersDir, USER_LIST_FILENAME); 217 readUserListLocked(); 218 // Prune out any partially created/partially removed users. 219 ArrayList<UserInfo> partials = new ArrayList<UserInfo>(); 220 for (int i = 0; i < mUsers.size(); i++) { 221 UserInfo ui = mUsers.valueAt(i); 222 if (ui.partial && i != 0) { 223 partials.add(ui); 224 } 225 } 226 for (int i = 0; i < partials.size(); i++) { 227 UserInfo ui = partials.get(i); 228 Slog.w(LOG_TAG, "Removing partially created user #" + i 229 + " (name=" + ui.name + ")"); 230 removeUserStateLocked(ui.id); 231 } 232 sInstance = this; 233 } 234 } 235 } 236 237 void systemReady() { 238 mUserPackageMonitor.register(mContext, 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 List<UserInfo> getProfiles(int userId) { 262 if (userId != UserHandle.getCallingUserId()) { 263 checkManageUsersPermission("getting profiles related to user " + userId); 264 } 265 synchronized (mPackagesLock) { 266 UserInfo user = getUserInfoLocked(userId); 267 ArrayList<UserInfo> users = new ArrayList<UserInfo>(mUsers.size()); 268 for (int i = 0; i < mUsers.size(); i++) { 269 UserInfo profile = mUsers.valueAt(i); 270 if (!isProfileOf(user, profile)) { 271 continue; 272 } 273 users.add(profile); 274 } 275 return users; 276 } 277 } 278 279 private boolean isProfileOf(UserInfo user, UserInfo profile) { 280 return user.id == profile.id || 281 (user.profileGroupId != UserInfo.NO_PROFILE_GROUP_ID 282 && user.profileGroupId == profile.profileGroupId); 283 } 284 285 @Override 286 public UserInfo getUserInfo(int userId) { 287 checkManageUsersPermission("query user"); 288 synchronized (mPackagesLock) { 289 return getUserInfoLocked(userId); 290 } 291 } 292 293 @Override 294 public boolean isRestricted() { 295 synchronized (mPackagesLock) { 296 return getUserInfoLocked(UserHandle.getCallingUserId()).isRestricted(); 297 } 298 } 299 300 /* 301 * Should be locked on mUsers before calling this. 302 */ 303 private UserInfo getUserInfoLocked(int userId) { 304 UserInfo ui = mUsers.get(userId); 305 // If it is partial and not in the process of being removed, return as unknown user. 306 if (ui != null && ui.partial && !mRemovingUserIds.get(userId)) { 307 Slog.w(LOG_TAG, "getUserInfo: unknown user #" + userId); 308 return null; 309 } 310 return ui; 311 } 312 313 public boolean exists(int userId) { 314 synchronized (mPackagesLock) { 315 return ArrayUtils.contains(mUserIds, userId); 316 } 317 } 318 319 @Override 320 public void setUserName(int userId, String name) { 321 checkManageUsersPermission("rename users"); 322 boolean changed = false; 323 synchronized (mPackagesLock) { 324 UserInfo info = mUsers.get(userId); 325 if (info == null || info.partial) { 326 Slog.w(LOG_TAG, "setUserName: unknown user #" + userId); 327 return; 328 } 329 if (name != null && !name.equals(info.name)) { 330 info.name = name; 331 writeUserLocked(info); 332 changed = true; 333 } 334 } 335 if (changed) { 336 sendUserInfoChangedBroadcast(userId); 337 } 338 } 339 340 @Override 341 public void setUserIcon(int userId, Bitmap bitmap) { 342 checkManageUsersPermission("update users"); 343 synchronized (mPackagesLock) { 344 UserInfo info = mUsers.get(userId); 345 if (info == null || info.partial) { 346 Slog.w(LOG_TAG, "setUserIcon: unknown user #" + userId); 347 return; 348 } 349 writeBitmapLocked(info, bitmap); 350 writeUserLocked(info); 351 } 352 sendUserInfoChangedBroadcast(userId); 353 } 354 355 private void sendUserInfoChangedBroadcast(int userId) { 356 Intent changedIntent = new Intent(Intent.ACTION_USER_INFO_CHANGED); 357 changedIntent.putExtra(Intent.EXTRA_USER_HANDLE, userId); 358 changedIntent.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY); 359 mContext.sendBroadcastAsUser(changedIntent, UserHandle.ALL); 360 } 361 362 @Override 363 public Bitmap getUserIcon(int userId) { 364 checkManageUsersPermission("read users"); 365 synchronized (mPackagesLock) { 366 UserInfo info = mUsers.get(userId); 367 if (info == null || info.partial) { 368 Slog.w(LOG_TAG, "getUserIcon: unknown user #" + userId); 369 return null; 370 } 371 if (info.iconPath == null) { 372 return null; 373 } 374 return BitmapFactory.decodeFile(info.iconPath); 375 } 376 } 377 378 @Override 379 public void setGuestEnabled(boolean enable) { 380 checkManageUsersPermission("enable guest users"); 381 synchronized (mPackagesLock) { 382 if (mGuestEnabled != enable) { 383 mGuestEnabled = enable; 384 // Erase any guest user that currently exists 385 for (int i = 0; i < mUsers.size(); i++) { 386 UserInfo user = mUsers.valueAt(i); 387 if (!user.partial && user.isGuest()) { 388 if (!enable) { 389 removeUser(user.id); 390 } 391 return; 392 } 393 } 394 // No guest was found 395 if (enable) { 396 createUser("Guest", UserInfo.FLAG_GUEST); 397 } 398 } 399 } 400 } 401 402 @Override 403 public boolean isGuestEnabled() { 404 synchronized (mPackagesLock) { 405 return mGuestEnabled; 406 } 407 } 408 409 @Override 410 public void wipeUser(int userHandle) { 411 checkManageUsersPermission("wipe user"); 412 // TODO: 413 } 414 415 public void makeInitialized(int userId) { 416 checkManageUsersPermission("makeInitialized"); 417 synchronized (mPackagesLock) { 418 UserInfo info = mUsers.get(userId); 419 if (info == null || info.partial) { 420 Slog.w(LOG_TAG, "makeInitialized: unknown user #" + userId); 421 } 422 if ((info.flags&UserInfo.FLAG_INITIALIZED) == 0) { 423 info.flags |= UserInfo.FLAG_INITIALIZED; 424 writeUserLocked(info); 425 } 426 } 427 } 428 429 @Override 430 public Bundle getUserRestrictions(int userId) { 431 // checkManageUsersPermission("getUserRestrictions"); 432 433 synchronized (mPackagesLock) { 434 Bundle restrictions = mUserRestrictions.get(userId); 435 return restrictions != null ? restrictions : Bundle.EMPTY; 436 } 437 } 438 439 @Override 440 public void setUserRestrictions(Bundle restrictions, int userId) { 441 checkProfileOwnerOrManageUsersPermission("setUserRestrictions"); 442 if (restrictions == null) return; 443 444 synchronized (mPackagesLock) { 445 mUserRestrictions.get(userId).clear(); 446 mUserRestrictions.get(userId).putAll(restrictions); 447 writeUserLocked(mUsers.get(userId)); 448 } 449 } 450 451 /** 452 * Check if we've hit the limit of how many users can be created. 453 */ 454 private boolean isUserLimitReachedLocked() { 455 int nUsers = mUsers.size(); 456 return nUsers >= UserManager.getMaxSupportedUsers(); 457 } 458 459 /** 460 * Enforces that only the system UID or root's UID or apps that have the 461 * {@link android.Manifest.permission#MANAGE_USERS MANAGE_USERS} 462 * permission can make certain calls to the UserManager. 463 * 464 * @param message used as message if SecurityException is thrown 465 * @throws SecurityException if the caller is not system or root 466 */ 467 private final void checkManageUsersPermission(String message) { 468 final int uid = Binder.getCallingUid(); 469 470 if (missingManageUsersPermission(uid)) { 471 throw new SecurityException("You need MANAGE_USERS permission to: " + message); 472 } 473 } 474 475 /** 476 * Enforces that only the system UID, root's UID, apps that have the 477 * {@link android.Manifest.permission#MANAGE_USERS MANAGE_USERS} 478 * permission, the profile owner, or the device owner can make certain calls to the 479 * UserManager. 480 * 481 * @param message used as message if SecurityException is thrown 482 * @throws SecurityException if the caller is not system, root, or device 483 * owner 484 */ 485 private final void checkProfileOwnerOrManageUsersPermission(String message) { 486 final int uid = Binder.getCallingUid(); 487 boolean isProfileOwner = false; 488 if (mContext != null && mContext.getPackageManager() != null) { 489 String[] pkgs = mContext.getPackageManager().getPackagesForUid(uid); 490 DevicePolicyManager dpm = 491 (DevicePolicyManager) mContext.getSystemService(Context.DEVICE_POLICY_SERVICE); 492 if (dpm != null) { 493 for (String pkg : pkgs) { 494 if (dpm.isDeviceOwnerApp(pkg) || dpm.isProfileOwnerApp(pkg)) { 495 isProfileOwner = true; 496 } 497 } 498 } 499 } 500 501 if (missingManageUsersPermission(uid) && !isProfileOwner) { 502 throw new SecurityException( 503 "You need MANAGE_USERS permission or device owner privileges to: " + message); 504 } 505 } 506 507 private boolean missingManageUsersPermission(int uid) { 508 return uid != Process.SYSTEM_UID && uid != 0 509 && ActivityManager.checkComponentPermission( 510 android.Manifest.permission.MANAGE_USERS, 511 uid, -1, true) != PackageManager.PERMISSION_GRANTED; 512 } 513 514 private void writeBitmapLocked(UserInfo info, Bitmap bitmap) { 515 try { 516 File dir = new File(mUsersDir, Integer.toString(info.id)); 517 File file = new File(dir, USER_PHOTO_FILENAME); 518 if (!dir.exists()) { 519 dir.mkdir(); 520 FileUtils.setPermissions( 521 dir.getPath(), 522 FileUtils.S_IRWXU|FileUtils.S_IRWXG|FileUtils.S_IXOTH, 523 -1, -1); 524 } 525 FileOutputStream os; 526 if (bitmap.compress(Bitmap.CompressFormat.PNG, 100, os = new FileOutputStream(file))) { 527 info.iconPath = file.getAbsolutePath(); 528 } 529 try { 530 os.close(); 531 } catch (IOException ioe) { 532 // What the ... ! 533 } 534 } catch (FileNotFoundException e) { 535 Slog.w(LOG_TAG, "Error setting photo for user ", e); 536 } 537 } 538 539 /** 540 * Returns an array of user ids. This array is cached here for quick access, so do not modify or 541 * cache it elsewhere. 542 * @return the array of user ids. 543 */ 544 public int[] getUserIds() { 545 synchronized (mPackagesLock) { 546 return mUserIds; 547 } 548 } 549 550 int[] getUserIdsLPr() { 551 return mUserIds; 552 } 553 554 private void readUserListLocked() { 555 mGuestEnabled = false; 556 if (!mUserListFile.exists()) { 557 fallbackToSingleUserLocked(); 558 return; 559 } 560 FileInputStream fis = null; 561 AtomicFile userListFile = new AtomicFile(mUserListFile); 562 try { 563 fis = userListFile.openRead(); 564 XmlPullParser parser = Xml.newPullParser(); 565 parser.setInput(fis, null); 566 int type; 567 while ((type = parser.next()) != XmlPullParser.START_TAG 568 && type != XmlPullParser.END_DOCUMENT) { 569 ; 570 } 571 572 if (type != XmlPullParser.START_TAG) { 573 Slog.e(LOG_TAG, "Unable to read user list"); 574 fallbackToSingleUserLocked(); 575 return; 576 } 577 578 mNextSerialNumber = -1; 579 if (parser.getName().equals(TAG_USERS)) { 580 String lastSerialNumber = parser.getAttributeValue(null, ATTR_NEXT_SERIAL_NO); 581 if (lastSerialNumber != null) { 582 mNextSerialNumber = Integer.parseInt(lastSerialNumber); 583 } 584 String versionNumber = parser.getAttributeValue(null, ATTR_USER_VERSION); 585 if (versionNumber != null) { 586 mUserVersion = Integer.parseInt(versionNumber); 587 } 588 } 589 590 while ((type = parser.next()) != XmlPullParser.END_DOCUMENT) { 591 if (type == XmlPullParser.START_TAG && parser.getName().equals(TAG_USER)) { 592 String id = parser.getAttributeValue(null, ATTR_ID); 593 UserInfo user = readUserLocked(Integer.parseInt(id)); 594 595 if (user != null) { 596 mUsers.put(user.id, user); 597 if (user.isGuest()) { 598 mGuestEnabled = true; 599 } 600 if (mNextSerialNumber < 0 || mNextSerialNumber <= user.id) { 601 mNextSerialNumber = user.id + 1; 602 } 603 } 604 } 605 } 606 updateUserIdsLocked(); 607 upgradeIfNecessaryLocked(); 608 } catch (IOException ioe) { 609 fallbackToSingleUserLocked(); 610 } catch (XmlPullParserException pe) { 611 fallbackToSingleUserLocked(); 612 } finally { 613 if (fis != null) { 614 try { 615 fis.close(); 616 } catch (IOException e) { 617 } 618 } 619 } 620 } 621 622 /** 623 * Upgrade steps between versions, either for fixing bugs or changing the data format. 624 */ 625 private void upgradeIfNecessaryLocked() { 626 int userVersion = mUserVersion; 627 if (userVersion < 1) { 628 // Assign a proper name for the owner, if not initialized correctly before 629 UserInfo user = mUsers.get(UserHandle.USER_OWNER); 630 if ("Primary".equals(user.name)) { 631 user.name = mContext.getResources().getString(com.android.internal.R.string.owner_name); 632 writeUserLocked(user); 633 } 634 userVersion = 1; 635 } 636 637 if (userVersion < 2) { 638 // Owner should be marked as initialized 639 UserInfo user = mUsers.get(UserHandle.USER_OWNER); 640 if ((user.flags & UserInfo.FLAG_INITIALIZED) == 0) { 641 user.flags |= UserInfo.FLAG_INITIALIZED; 642 writeUserLocked(user); 643 } 644 userVersion = 2; 645 } 646 647 648 if (userVersion < 4) { 649 userVersion = 4; 650 } 651 652 if (userVersion < USER_VERSION) { 653 Slog.w(LOG_TAG, "User version " + mUserVersion + " didn't upgrade as expected to " 654 + USER_VERSION); 655 } else { 656 mUserVersion = userVersion; 657 writeUserListLocked(); 658 } 659 } 660 661 private void fallbackToSingleUserLocked() { 662 // Create the primary user 663 UserInfo primary = new UserInfo(UserHandle.USER_OWNER, 664 mContext.getResources().getString(com.android.internal.R.string.owner_name), null, 665 UserInfo.FLAG_ADMIN | UserInfo.FLAG_PRIMARY | UserInfo.FLAG_INITIALIZED); 666 mUsers.put(0, primary); 667 mNextSerialNumber = MIN_USER_ID; 668 mUserVersion = USER_VERSION; 669 670 Bundle restrictions = new Bundle(); 671 mUserRestrictions.append(UserHandle.USER_OWNER, restrictions); 672 673 updateUserIdsLocked(); 674 675 writeUserListLocked(); 676 writeUserLocked(primary); 677 } 678 679 /* 680 * Writes the user file in this format: 681 * 682 * <user flags="20039023" id="0"> 683 * <name>Primary</name> 684 * </user> 685 */ 686 private void writeUserLocked(UserInfo userInfo) { 687 FileOutputStream fos = null; 688 AtomicFile userFile = new AtomicFile(new File(mUsersDir, userInfo.id + XML_SUFFIX)); 689 try { 690 fos = userFile.startWrite(); 691 final BufferedOutputStream bos = new BufferedOutputStream(fos); 692 693 // XmlSerializer serializer = XmlUtils.serializerInstance(); 694 final XmlSerializer serializer = new FastXmlSerializer(); 695 serializer.setOutput(bos, "utf-8"); 696 serializer.startDocument(null, true); 697 serializer.setFeature("http://xmlpull.org/v1/doc/features.html#indent-output", true); 698 699 serializer.startTag(null, TAG_USER); 700 serializer.attribute(null, ATTR_ID, Integer.toString(userInfo.id)); 701 serializer.attribute(null, ATTR_SERIAL_NO, Integer.toString(userInfo.serialNumber)); 702 serializer.attribute(null, ATTR_FLAGS, Integer.toString(userInfo.flags)); 703 serializer.attribute(null, ATTR_CREATION_TIME, Long.toString(userInfo.creationTime)); 704 serializer.attribute(null, ATTR_LAST_LOGGED_IN_TIME, 705 Long.toString(userInfo.lastLoggedInTime)); 706 RestrictionsPinState pinState = mRestrictionsPinStates.get(userInfo.id); 707 if (pinState != null) { 708 if (pinState.salt != 0) { 709 serializer.attribute(null, ATTR_SALT, Long.toString(pinState.salt)); 710 } 711 if (pinState.pinHash != null) { 712 serializer.attribute(null, ATTR_PIN_HASH, pinState.pinHash); 713 } 714 if (pinState.failedAttempts != 0) { 715 serializer.attribute(null, ATTR_FAILED_ATTEMPTS, 716 Integer.toString(pinState.failedAttempts)); 717 serializer.attribute(null, ATTR_LAST_RETRY_MS, 718 Long.toString(pinState.lastAttemptTime)); 719 } 720 } 721 if (userInfo.iconPath != null) { 722 serializer.attribute(null, ATTR_ICON_PATH, userInfo.iconPath); 723 } 724 if (userInfo.partial) { 725 serializer.attribute(null, ATTR_PARTIAL, "true"); 726 } 727 if (userInfo.profileGroupId != UserInfo.NO_PROFILE_GROUP_ID) { 728 serializer.attribute(null, ATTR_PROFILE_GROUP_ID, 729 Integer.toString(userInfo.profileGroupId)); 730 } 731 732 serializer.startTag(null, TAG_NAME); 733 serializer.text(userInfo.name); 734 serializer.endTag(null, TAG_NAME); 735 736 Bundle restrictions = mUserRestrictions.get(userInfo.id); 737 if (restrictions != null) { 738 serializer.startTag(null, TAG_RESTRICTIONS); 739 writeBoolean(serializer, restrictions, UserManager.DISALLOW_CONFIG_WIFI); 740 writeBoolean(serializer, restrictions, UserManager.DISALLOW_MODIFY_ACCOUNTS); 741 writeBoolean(serializer, restrictions, UserManager.DISALLOW_INSTALL_APPS); 742 writeBoolean(serializer, restrictions, UserManager.DISALLOW_UNINSTALL_APPS); 743 writeBoolean(serializer, restrictions, UserManager.DISALLOW_SHARE_LOCATION); 744 writeBoolean(serializer, restrictions, 745 UserManager.DISALLOW_INSTALL_UNKNOWN_SOURCES); 746 writeBoolean(serializer, restrictions, UserManager.DISALLOW_CONFIG_BLUETOOTH); 747 writeBoolean(serializer, restrictions, UserManager.DISALLOW_USB_FILE_TRANSFER); 748 writeBoolean(serializer, restrictions, UserManager.DISALLOW_CONFIG_CREDENTIALS); 749 writeBoolean(serializer, restrictions, UserManager.DISALLOW_REMOVE_USER); 750 serializer.endTag(null, TAG_RESTRICTIONS); 751 } 752 serializer.endTag(null, TAG_USER); 753 754 serializer.endDocument(); 755 userFile.finishWrite(fos); 756 } catch (Exception ioe) { 757 Slog.e(LOG_TAG, "Error writing user info " + userInfo.id + "\n" + ioe); 758 userFile.failWrite(fos); 759 } 760 } 761 762 /* 763 * Writes the user list file in this format: 764 * 765 * <users nextSerialNumber="3"> 766 * <user id="0"></user> 767 * <user id="2"></user> 768 * </users> 769 */ 770 private void writeUserListLocked() { 771 FileOutputStream fos = null; 772 AtomicFile userListFile = new AtomicFile(mUserListFile); 773 try { 774 fos = userListFile.startWrite(); 775 final BufferedOutputStream bos = new BufferedOutputStream(fos); 776 777 // XmlSerializer serializer = XmlUtils.serializerInstance(); 778 final XmlSerializer serializer = new FastXmlSerializer(); 779 serializer.setOutput(bos, "utf-8"); 780 serializer.startDocument(null, true); 781 serializer.setFeature("http://xmlpull.org/v1/doc/features.html#indent-output", true); 782 783 serializer.startTag(null, TAG_USERS); 784 serializer.attribute(null, ATTR_NEXT_SERIAL_NO, Integer.toString(mNextSerialNumber)); 785 serializer.attribute(null, ATTR_USER_VERSION, Integer.toString(mUserVersion)); 786 787 for (int i = 0; i < mUsers.size(); i++) { 788 UserInfo user = mUsers.valueAt(i); 789 serializer.startTag(null, TAG_USER); 790 serializer.attribute(null, ATTR_ID, Integer.toString(user.id)); 791 serializer.endTag(null, TAG_USER); 792 } 793 794 serializer.endTag(null, TAG_USERS); 795 796 serializer.endDocument(); 797 userListFile.finishWrite(fos); 798 } catch (Exception e) { 799 userListFile.failWrite(fos); 800 Slog.e(LOG_TAG, "Error writing user list"); 801 } 802 } 803 804 private UserInfo readUserLocked(int id) { 805 int flags = 0; 806 int serialNumber = id; 807 String name = null; 808 String iconPath = null; 809 long creationTime = 0L; 810 long lastLoggedInTime = 0L; 811 long salt = 0L; 812 String pinHash = null; 813 int failedAttempts = 0; 814 int profileGroupId = UserInfo.NO_PROFILE_GROUP_ID; 815 long lastAttemptTime = 0L; 816 boolean partial = false; 817 Bundle restrictions = new Bundle(); 818 819 FileInputStream fis = null; 820 try { 821 AtomicFile userFile = 822 new AtomicFile(new File(mUsersDir, Integer.toString(id) + XML_SUFFIX)); 823 fis = userFile.openRead(); 824 XmlPullParser parser = Xml.newPullParser(); 825 parser.setInput(fis, null); 826 int type; 827 while ((type = parser.next()) != XmlPullParser.START_TAG 828 && type != XmlPullParser.END_DOCUMENT) { 829 ; 830 } 831 832 if (type != XmlPullParser.START_TAG) { 833 Slog.e(LOG_TAG, "Unable to read user " + id); 834 return null; 835 } 836 837 if (type == XmlPullParser.START_TAG && parser.getName().equals(TAG_USER)) { 838 int storedId = readIntAttribute(parser, ATTR_ID, -1); 839 if (storedId != id) { 840 Slog.e(LOG_TAG, "User id does not match the file name"); 841 return null; 842 } 843 serialNumber = readIntAttribute(parser, ATTR_SERIAL_NO, id); 844 flags = readIntAttribute(parser, ATTR_FLAGS, 0); 845 iconPath = parser.getAttributeValue(null, ATTR_ICON_PATH); 846 creationTime = readLongAttribute(parser, ATTR_CREATION_TIME, 0); 847 lastLoggedInTime = readLongAttribute(parser, ATTR_LAST_LOGGED_IN_TIME, 0); 848 salt = readLongAttribute(parser, ATTR_SALT, 0L); 849 pinHash = parser.getAttributeValue(null, ATTR_PIN_HASH); 850 failedAttempts = readIntAttribute(parser, ATTR_FAILED_ATTEMPTS, 0); 851 lastAttemptTime = readLongAttribute(parser, ATTR_LAST_RETRY_MS, 0L); 852 profileGroupId = readIntAttribute(parser, ATTR_PROFILE_GROUP_ID, 853 UserInfo.NO_PROFILE_GROUP_ID); 854 if (profileGroupId == UserInfo.NO_PROFILE_GROUP_ID) { 855 // This attribute was added and renamed during development of L. 856 // TODO Remove upgrade path by 1st May 2014 857 profileGroupId = readIntAttribute(parser, "relatedGroupId", 858 UserInfo.NO_PROFILE_GROUP_ID); 859 } 860 String valueString = parser.getAttributeValue(null, ATTR_PARTIAL); 861 if ("true".equals(valueString)) { 862 partial = true; 863 } 864 865 int outerDepth = parser.getDepth(); 866 while ((type = parser.next()) != XmlPullParser.END_DOCUMENT 867 && (type != XmlPullParser.END_TAG || parser.getDepth() > outerDepth)) { 868 if (type == XmlPullParser.END_TAG || type == XmlPullParser.TEXT) { 869 continue; 870 } 871 String tag = parser.getName(); 872 if (TAG_NAME.equals(tag)) { 873 type = parser.next(); 874 if (type == XmlPullParser.TEXT) { 875 name = parser.getText(); 876 } 877 } else if (TAG_RESTRICTIONS.equals(tag)) { 878 readBoolean(parser, restrictions, UserManager.DISALLOW_CONFIG_WIFI); 879 readBoolean(parser, restrictions, UserManager.DISALLOW_MODIFY_ACCOUNTS); 880 readBoolean(parser, restrictions, UserManager.DISALLOW_INSTALL_APPS); 881 readBoolean(parser, restrictions, UserManager.DISALLOW_UNINSTALL_APPS); 882 readBoolean(parser, restrictions, UserManager.DISALLOW_SHARE_LOCATION); 883 readBoolean(parser, restrictions, 884 UserManager.DISALLOW_INSTALL_UNKNOWN_SOURCES); 885 readBoolean(parser, restrictions, UserManager.DISALLOW_CONFIG_BLUETOOTH); 886 readBoolean(parser, restrictions, UserManager.DISALLOW_USB_FILE_TRANSFER); 887 readBoolean(parser, restrictions, UserManager.DISALLOW_CONFIG_CREDENTIALS); 888 readBoolean(parser, restrictions, UserManager.DISALLOW_REMOVE_USER); 889 } 890 } 891 } 892 893 UserInfo userInfo = new UserInfo(id, name, iconPath, flags); 894 userInfo.serialNumber = serialNumber; 895 userInfo.creationTime = creationTime; 896 userInfo.lastLoggedInTime = lastLoggedInTime; 897 userInfo.partial = partial; 898 userInfo.profileGroupId = profileGroupId; 899 mUserRestrictions.append(id, restrictions); 900 if (salt != 0L) { 901 RestrictionsPinState pinState = mRestrictionsPinStates.get(id); 902 if (pinState == null) { 903 pinState = new RestrictionsPinState(); 904 mRestrictionsPinStates.put(id, pinState); 905 } 906 pinState.salt = salt; 907 pinState.pinHash = pinHash; 908 pinState.failedAttempts = failedAttempts; 909 pinState.lastAttemptTime = lastAttemptTime; 910 } 911 return userInfo; 912 913 } catch (IOException ioe) { 914 } catch (XmlPullParserException pe) { 915 } finally { 916 if (fis != null) { 917 try { 918 fis.close(); 919 } catch (IOException e) { 920 } 921 } 922 } 923 return null; 924 } 925 926 private void readBoolean(XmlPullParser parser, Bundle restrictions, 927 String restrictionKey) { 928 String value = parser.getAttributeValue(null, restrictionKey); 929 if (value != null) { 930 restrictions.putBoolean(restrictionKey, Boolean.parseBoolean(value)); 931 } 932 } 933 934 private void writeBoolean(XmlSerializer xml, Bundle restrictions, String restrictionKey) 935 throws IOException { 936 if (restrictions.containsKey(restrictionKey)) { 937 xml.attribute(null, restrictionKey, 938 Boolean.toString(restrictions.getBoolean(restrictionKey))); 939 } 940 } 941 942 private int readIntAttribute(XmlPullParser parser, String attr, int defaultValue) { 943 String valueString = parser.getAttributeValue(null, attr); 944 if (valueString == null) return defaultValue; 945 try { 946 return Integer.parseInt(valueString); 947 } catch (NumberFormatException nfe) { 948 return defaultValue; 949 } 950 } 951 952 private long readLongAttribute(XmlPullParser parser, String attr, long defaultValue) { 953 String valueString = parser.getAttributeValue(null, attr); 954 if (valueString == null) return defaultValue; 955 try { 956 return Long.parseLong(valueString); 957 } catch (NumberFormatException nfe) { 958 return defaultValue; 959 } 960 } 961 962 private boolean isPackageInstalled(String pkg, int userId) { 963 final ApplicationInfo info = mPm.getApplicationInfo(pkg, 964 PackageManager.GET_UNINSTALLED_PACKAGES, 965 userId); 966 if (info == null || (info.flags&ApplicationInfo.FLAG_INSTALLED) == 0) { 967 return false; 968 } 969 return true; 970 } 971 972 /** 973 * Removes all the restrictions files (res_<packagename>) for a given user, if all is true, 974 * else removes only those packages that have been uninstalled. 975 * Does not do any permissions checking. 976 */ 977 private void cleanAppRestrictions(int userId, boolean all) { 978 synchronized (mPackagesLock) { 979 File dir = Environment.getUserSystemDirectory(userId); 980 String[] files = dir.list(); 981 if (files == null) return; 982 for (String fileName : files) { 983 if (fileName.startsWith(RESTRICTIONS_FILE_PREFIX)) { 984 File resFile = new File(dir, fileName); 985 if (resFile.exists()) { 986 if (all) { 987 resFile.delete(); 988 } else { 989 String pkg = restrictionsFileNameToPackage(fileName); 990 if (!isPackageInstalled(pkg, userId)) { 991 resFile.delete(); 992 } 993 } 994 } 995 } 996 } 997 } 998 } 999 1000 /** 1001 * Removes the app restrictions file for a specific package and user id, if it exists. 1002 */ 1003 private void cleanAppRestrictionsForPackage(String pkg, int userId) { 1004 synchronized (mPackagesLock) { 1005 File dir = Environment.getUserSystemDirectory(userId); 1006 File resFile = new File(dir, packageToRestrictionsFileName(pkg)); 1007 if (resFile.exists()) { 1008 resFile.delete(); 1009 } 1010 } 1011 } 1012 1013 private int getNextProfileGroupIdLocked() { 1014 int maxGroupId = UserInfo.NO_PROFILE_GROUP_ID; 1015 for (int i = 0; i < mUsers.size(); i++) { 1016 UserInfo ui = mUsers.valueAt(i); 1017 if (maxGroupId < ui.profileGroupId) { 1018 maxGroupId = ui.profileGroupId; 1019 } 1020 } 1021 return maxGroupId + 1; 1022 } 1023 1024 @Override 1025 public UserInfo createProfileForUser(String name, int flags, int userId) { 1026 checkManageUsersPermission("Only the system can create users"); 1027 if (userId != UserHandle.USER_OWNER) { 1028 Slog.w(LOG_TAG, "Only user owner can have profiles"); 1029 return null; 1030 } 1031 return createUserInternal(name, flags, userId); 1032 } 1033 1034 @Override 1035 public UserInfo createUser(String name, int flags) { 1036 checkManageUsersPermission("Only the system can create users"); 1037 return createUserInternal(name, flags, UserHandle.USER_NULL); 1038 } 1039 1040 private UserInfo createUserInternal(String name, int flags, int profileId) { 1041 final long ident = Binder.clearCallingIdentity(); 1042 UserInfo userInfo = null; 1043 try { 1044 synchronized (mInstallLock) { 1045 synchronized (mPackagesLock) { 1046 UserInfo profile = null; 1047 if (profileId != UserHandle.USER_NULL) { 1048 profile = getUserInfoLocked(profileId); 1049 if (profile == null) return null; 1050 } 1051 if (isUserLimitReachedLocked()) return null; 1052 int userId = getNextAvailableIdLocked(); 1053 userInfo = new UserInfo(userId, name, null, flags); 1054 File userPath = new File(mBaseUserPath, Integer.toString(userId)); 1055 userInfo.serialNumber = mNextSerialNumber++; 1056 long now = System.currentTimeMillis(); 1057 userInfo.creationTime = (now > EPOCH_PLUS_30_YEARS) ? now : 0; 1058 userInfo.partial = true; 1059 Environment.getUserSystemDirectory(userInfo.id).mkdirs(); 1060 mUsers.put(userId, userInfo); 1061 writeUserListLocked(); 1062 if (profile != null) { 1063 if (profile.profileGroupId == UserInfo.NO_PROFILE_GROUP_ID) { 1064 profile.profileGroupId = getNextProfileGroupIdLocked(); 1065 writeUserLocked(profile); 1066 } 1067 userInfo.profileGroupId = profile.profileGroupId; 1068 } 1069 writeUserLocked(userInfo); 1070 mPm.createNewUserLILPw(userId, userPath); 1071 userInfo.partial = false; 1072 writeUserLocked(userInfo); 1073 updateUserIdsLocked(); 1074 Bundle restrictions = new Bundle(); 1075 mUserRestrictions.append(userId, restrictions); 1076 } 1077 } 1078 if (userInfo != null) { 1079 Intent addedIntent = new Intent(Intent.ACTION_USER_ADDED); 1080 addedIntent.putExtra(Intent.EXTRA_USER_HANDLE, userInfo.id); 1081 mContext.sendBroadcastAsUser(addedIntent, UserHandle.ALL, 1082 android.Manifest.permission.MANAGE_USERS); 1083 } 1084 } finally { 1085 Binder.restoreCallingIdentity(ident); 1086 } 1087 return userInfo; 1088 } 1089 1090 /** 1091 * Removes a user and all data directories created for that user. This method should be called 1092 * after the user's processes have been terminated. 1093 * @param userHandle the user's id 1094 */ 1095 public boolean removeUser(int userHandle) { 1096 checkManageUsersPermission("Only the system can remove users"); 1097 final UserInfo user; 1098 synchronized (mPackagesLock) { 1099 user = mUsers.get(userHandle); 1100 if (userHandle == 0 || user == null) { 1101 return false; 1102 } 1103 mRemovingUserIds.put(userHandle, true); 1104 // Set this to a partially created user, so that the user will be purged 1105 // on next startup, in case the runtime stops now before stopping and 1106 // removing the user completely. 1107 user.partial = true; 1108 writeUserLocked(user); 1109 } 1110 if (DBG) Slog.i(LOG_TAG, "Stopping user " + userHandle); 1111 int res; 1112 try { 1113 res = ActivityManagerNative.getDefault().stopUser(userHandle, 1114 new IStopUserCallback.Stub() { 1115 @Override 1116 public void userStopped(int userId) { 1117 finishRemoveUser(userId); 1118 } 1119 @Override 1120 public void userStopAborted(int userId) { 1121 } 1122 }); 1123 } catch (RemoteException e) { 1124 return false; 1125 } 1126 1127 return res == ActivityManager.USER_OP_SUCCESS; 1128 } 1129 1130 void finishRemoveUser(final int userHandle) { 1131 if (DBG) Slog.i(LOG_TAG, "finishRemoveUser " + userHandle); 1132 // Let other services shutdown any activity and clean up their state before completely 1133 // wiping the user's system directory and removing from the user list 1134 long ident = Binder.clearCallingIdentity(); 1135 try { 1136 Intent addedIntent = new Intent(Intent.ACTION_USER_REMOVED); 1137 addedIntent.putExtra(Intent.EXTRA_USER_HANDLE, userHandle); 1138 mContext.sendOrderedBroadcastAsUser(addedIntent, UserHandle.ALL, 1139 android.Manifest.permission.MANAGE_USERS, 1140 1141 new BroadcastReceiver() { 1142 @Override 1143 public void onReceive(Context context, Intent intent) { 1144 if (DBG) { 1145 Slog.i(LOG_TAG, 1146 "USER_REMOVED broadcast sent, cleaning up user data " 1147 + userHandle); 1148 } 1149 new Thread() { 1150 public void run() { 1151 synchronized (mInstallLock) { 1152 synchronized (mPackagesLock) { 1153 removeUserStateLocked(userHandle); 1154 } 1155 } 1156 } 1157 }.start(); 1158 } 1159 }, 1160 1161 null, Activity.RESULT_OK, null, null); 1162 } finally { 1163 Binder.restoreCallingIdentity(ident); 1164 } 1165 } 1166 1167 private void removeUserStateLocked(final int userHandle) { 1168 // Cleanup package manager settings 1169 mPm.cleanUpUserLILPw(userHandle); 1170 1171 // Remove this user from the list 1172 mUsers.remove(userHandle); 1173 1174 // Have user ID linger for several seconds to let external storage VFS 1175 // cache entries expire. This must be greater than the 'entry_valid' 1176 // timeout used by the FUSE daemon. 1177 mHandler.postDelayed(new Runnable() { 1178 @Override 1179 public void run() { 1180 synchronized (mPackagesLock) { 1181 mRemovingUserIds.delete(userHandle); 1182 } 1183 } 1184 }, MINUTE_IN_MILLIS); 1185 1186 mRestrictionsPinStates.remove(userHandle); 1187 // Remove user file 1188 AtomicFile userFile = new AtomicFile(new File(mUsersDir, userHandle + XML_SUFFIX)); 1189 userFile.delete(); 1190 // Update the user list 1191 writeUserListLocked(); 1192 updateUserIdsLocked(); 1193 removeDirectoryRecursive(Environment.getUserSystemDirectory(userHandle)); 1194 } 1195 1196 private void removeDirectoryRecursive(File parent) { 1197 if (parent.isDirectory()) { 1198 String[] files = parent.list(); 1199 for (String filename : files) { 1200 File child = new File(parent, filename); 1201 removeDirectoryRecursive(child); 1202 } 1203 } 1204 parent.delete(); 1205 } 1206 1207 @Override 1208 public Bundle getApplicationRestrictions(String packageName) { 1209 return getApplicationRestrictionsForUser(packageName, UserHandle.getCallingUserId()); 1210 } 1211 1212 @Override 1213 public Bundle getApplicationRestrictionsForUser(String packageName, int userId) { 1214 if (UserHandle.getCallingUserId() != userId 1215 || !UserHandle.isSameApp(Binder.getCallingUid(), getUidForPackage(packageName))) { 1216 checkProfileOwnerOrManageUsersPermission( 1217 "Only system or device owner can get restrictions for other users/apps"); 1218 } 1219 synchronized (mPackagesLock) { 1220 // Read the restrictions from XML 1221 return readApplicationRestrictionsLocked(packageName, userId); 1222 } 1223 } 1224 1225 @Override 1226 public void setApplicationRestrictions(String packageName, Bundle restrictions, 1227 int userId) { 1228 if (UserHandle.getCallingUserId() != userId 1229 || !UserHandle.isSameApp(Binder.getCallingUid(), getUidForPackage(packageName))) { 1230 checkProfileOwnerOrManageUsersPermission( 1231 "Only system or device owner can set restrictions for other users/apps"); 1232 } 1233 synchronized (mPackagesLock) { 1234 // Write the restrictions to XML 1235 writeApplicationRestrictionsLocked(packageName, restrictions, userId); 1236 } 1237 1238 // Notify package of changes via an intent - only sent to explicitly registered receivers. 1239 Intent changeIntent = new Intent(Intent.ACTION_APPLICATION_RESTRICTIONS_CHANGED); 1240 changeIntent.setPackage(packageName); 1241 changeIntent.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY); 1242 mContext.sendBroadcastAsUser(changeIntent, new UserHandle(userId)); 1243 } 1244 1245 @Override 1246 public boolean setRestrictionsChallenge(String newPin) { 1247 checkManageUsersPermission("Only system can modify the restrictions pin"); 1248 int userId = UserHandle.getCallingUserId(); 1249 synchronized (mPackagesLock) { 1250 RestrictionsPinState pinState = mRestrictionsPinStates.get(userId); 1251 if (pinState == null) { 1252 pinState = new RestrictionsPinState(); 1253 } 1254 if (newPin == null) { 1255 pinState.salt = 0; 1256 pinState.pinHash = null; 1257 } else { 1258 try { 1259 pinState.salt = SecureRandom.getInstance("SHA1PRNG").nextLong(); 1260 } catch (NoSuchAlgorithmException e) { 1261 pinState.salt = (long) (Math.random() * Long.MAX_VALUE); 1262 } 1263 pinState.pinHash = passwordToHash(newPin, pinState.salt); 1264 pinState.failedAttempts = 0; 1265 } 1266 mRestrictionsPinStates.put(userId, pinState); 1267 writeUserLocked(mUsers.get(userId)); 1268 } 1269 return true; 1270 } 1271 1272 @Override 1273 public int checkRestrictionsChallenge(String pin) { 1274 checkManageUsersPermission("Only system can verify the restrictions pin"); 1275 int userId = UserHandle.getCallingUserId(); 1276 synchronized (mPackagesLock) { 1277 RestrictionsPinState pinState = mRestrictionsPinStates.get(userId); 1278 // If there's no pin set, return error code 1279 if (pinState == null || pinState.salt == 0 || pinState.pinHash == null) { 1280 return UserManager.PIN_VERIFICATION_FAILED_NOT_SET; 1281 } else if (pin == null) { 1282 // If just checking if user can be prompted, return remaining time 1283 int waitTime = getRemainingTimeForPinAttempt(pinState); 1284 Slog.d(LOG_TAG, "Remaining waittime peek=" + waitTime); 1285 return waitTime; 1286 } else { 1287 int waitTime = getRemainingTimeForPinAttempt(pinState); 1288 Slog.d(LOG_TAG, "Remaining waittime=" + waitTime); 1289 if (waitTime > 0) { 1290 return waitTime; 1291 } 1292 if (passwordToHash(pin, pinState.salt).equals(pinState.pinHash)) { 1293 pinState.failedAttempts = 0; 1294 writeUserLocked(mUsers.get(userId)); 1295 return UserManager.PIN_VERIFICATION_SUCCESS; 1296 } else { 1297 pinState.failedAttempts++; 1298 pinState.lastAttemptTime = System.currentTimeMillis(); 1299 writeUserLocked(mUsers.get(userId)); 1300 return waitTime; 1301 } 1302 } 1303 } 1304 } 1305 1306 private int getRemainingTimeForPinAttempt(RestrictionsPinState pinState) { 1307 int backoffIndex = Math.min(pinState.failedAttempts / BACKOFF_INC_INTERVAL, 1308 BACKOFF_TIMES.length - 1); 1309 int backoffTime = (pinState.failedAttempts % BACKOFF_INC_INTERVAL) == 0 ? 1310 BACKOFF_TIMES[backoffIndex] : 0; 1311 return (int) Math.max(backoffTime + pinState.lastAttemptTime - System.currentTimeMillis(), 1312 0); 1313 } 1314 1315 @Override 1316 public boolean hasRestrictionsChallenge() { 1317 int userId = UserHandle.getCallingUserId(); 1318 synchronized (mPackagesLock) { 1319 return hasRestrictionsPinLocked(userId); 1320 } 1321 } 1322 1323 private boolean hasRestrictionsPinLocked(int userId) { 1324 RestrictionsPinState pinState = mRestrictionsPinStates.get(userId); 1325 if (pinState == null || pinState.salt == 0 || pinState.pinHash == null) { 1326 return false; 1327 } 1328 return true; 1329 } 1330 1331 @Override 1332 public void removeRestrictions() { 1333 checkProfileOwnerOrManageUsersPermission( 1334 "Only system or device owner can remove restrictions"); 1335 final int userHandle = UserHandle.getCallingUserId(); 1336 removeRestrictionsForUser(userHandle, true); 1337 } 1338 1339 private void removeRestrictionsForUser(final int userHandle, boolean unblockApps) { 1340 synchronized (mPackagesLock) { 1341 // Remove all user restrictions 1342 setUserRestrictions(new Bundle(), userHandle); 1343 // Remove restrictions pin 1344 setRestrictionsChallenge(null); 1345 // Remove any app restrictions 1346 cleanAppRestrictions(userHandle, true); 1347 } 1348 if (unblockApps) { 1349 unblockAllAppsForUser(userHandle); 1350 } 1351 } 1352 1353 private void unblockAllAppsForUser(final int userHandle) { 1354 mHandler.post(new Runnable() { 1355 @Override 1356 public void run() { 1357 List<ApplicationInfo> apps = 1358 mPm.getInstalledApplications(PackageManager.GET_UNINSTALLED_PACKAGES, 1359 userHandle).getList(); 1360 final long ident = Binder.clearCallingIdentity(); 1361 try { 1362 for (ApplicationInfo appInfo : apps) { 1363 if ((appInfo.flags & ApplicationInfo.FLAG_INSTALLED) != 0 1364 && (appInfo.flags & ApplicationInfo.FLAG_BLOCKED) != 0) { 1365 mPm.setApplicationBlockedSettingAsUser(appInfo.packageName, false, 1366 userHandle); 1367 } 1368 } 1369 } finally { 1370 Binder.restoreCallingIdentity(ident); 1371 } 1372 } 1373 }); 1374 } 1375 1376 /* 1377 * Generate a hash for the given password. To avoid brute force attacks, we use a salted hash. 1378 * Not the most secure, but it is at least a second level of protection. First level is that 1379 * the file is in a location only readable by the system process. 1380 * @param password the password. 1381 * @param salt the randomly generated salt 1382 * @return the hash of the pattern in a String. 1383 */ 1384 private String passwordToHash(String password, long salt) { 1385 if (password == null) { 1386 return null; 1387 } 1388 String algo = null; 1389 String hashed = salt + password; 1390 try { 1391 byte[] saltedPassword = (password + salt).getBytes(); 1392 byte[] sha1 = MessageDigest.getInstance(algo = "SHA-1").digest(saltedPassword); 1393 byte[] md5 = MessageDigest.getInstance(algo = "MD5").digest(saltedPassword); 1394 hashed = toHex(sha1) + toHex(md5); 1395 } catch (NoSuchAlgorithmException e) { 1396 Log.w(LOG_TAG, "Failed to encode string because of missing algorithm: " + algo); 1397 } 1398 return hashed; 1399 } 1400 1401 private static String toHex(byte[] ary) { 1402 final String hex = "0123456789ABCDEF"; 1403 String ret = ""; 1404 for (int i = 0; i < ary.length; i++) { 1405 ret += hex.charAt((ary[i] >> 4) & 0xf); 1406 ret += hex.charAt(ary[i] & 0xf); 1407 } 1408 return ret; 1409 } 1410 1411 private int getUidForPackage(String packageName) { 1412 long ident = Binder.clearCallingIdentity(); 1413 try { 1414 return mContext.getPackageManager().getApplicationInfo(packageName, 1415 PackageManager.GET_UNINSTALLED_PACKAGES).uid; 1416 } catch (NameNotFoundException nnfe) { 1417 return -1; 1418 } finally { 1419 Binder.restoreCallingIdentity(ident); 1420 } 1421 } 1422 1423 private Bundle readApplicationRestrictionsLocked(String packageName, 1424 int userId) { 1425 final Bundle restrictions = new Bundle(); 1426 final ArrayList<String> values = new ArrayList<String>(); 1427 1428 FileInputStream fis = null; 1429 try { 1430 AtomicFile restrictionsFile = 1431 new AtomicFile(new File(Environment.getUserSystemDirectory(userId), 1432 packageToRestrictionsFileName(packageName))); 1433 fis = restrictionsFile.openRead(); 1434 XmlPullParser parser = Xml.newPullParser(); 1435 parser.setInput(fis, null); 1436 int type; 1437 while ((type = parser.next()) != XmlPullParser.START_TAG 1438 && type != XmlPullParser.END_DOCUMENT) { 1439 ; 1440 } 1441 1442 if (type != XmlPullParser.START_TAG) { 1443 Slog.e(LOG_TAG, "Unable to read restrictions file " 1444 + restrictionsFile.getBaseFile()); 1445 return restrictions; 1446 } 1447 1448 while ((type = parser.next()) != XmlPullParser.END_DOCUMENT) { 1449 if (type == XmlPullParser.START_TAG && parser.getName().equals(TAG_ENTRY)) { 1450 String key = parser.getAttributeValue(null, ATTR_KEY); 1451 String valType = parser.getAttributeValue(null, ATTR_VALUE_TYPE); 1452 String multiple = parser.getAttributeValue(null, ATTR_MULTIPLE); 1453 if (multiple != null) { 1454 int count = Integer.parseInt(multiple); 1455 while (count > 0 && (type = parser.next()) != XmlPullParser.END_DOCUMENT) { 1456 if (type == XmlPullParser.START_TAG 1457 && parser.getName().equals(TAG_VALUE)) { 1458 values.add(parser.nextText().trim()); 1459 count--; 1460 } 1461 } 1462 String [] valueStrings = new String[values.size()]; 1463 values.toArray(valueStrings); 1464 restrictions.putStringArray(key, valueStrings); 1465 } else if (ATTR_TYPE_BOOLEAN.equals(valType)) { 1466 restrictions.putBoolean(key, Boolean.parseBoolean( 1467 parser.nextText().trim())); 1468 } else { 1469 String value = parser.nextText().trim(); 1470 restrictions.putString(key, value); 1471 } 1472 } 1473 } 1474 1475 } catch (IOException ioe) { 1476 } catch (XmlPullParserException pe) { 1477 } finally { 1478 if (fis != null) { 1479 try { 1480 fis.close(); 1481 } catch (IOException e) { 1482 } 1483 } 1484 } 1485 return restrictions; 1486 } 1487 1488 private void writeApplicationRestrictionsLocked(String packageName, 1489 Bundle restrictions, int userId) { 1490 FileOutputStream fos = null; 1491 AtomicFile restrictionsFile = new AtomicFile( 1492 new File(Environment.getUserSystemDirectory(userId), 1493 packageToRestrictionsFileName(packageName))); 1494 try { 1495 fos = restrictionsFile.startWrite(); 1496 final BufferedOutputStream bos = new BufferedOutputStream(fos); 1497 1498 // XmlSerializer serializer = XmlUtils.serializerInstance(); 1499 final XmlSerializer serializer = new FastXmlSerializer(); 1500 serializer.setOutput(bos, "utf-8"); 1501 serializer.startDocument(null, true); 1502 serializer.setFeature("http://xmlpull.org/v1/doc/features.html#indent-output", true); 1503 1504 serializer.startTag(null, TAG_RESTRICTIONS); 1505 1506 for (String key : restrictions.keySet()) { 1507 Object value = restrictions.get(key); 1508 serializer.startTag(null, TAG_ENTRY); 1509 serializer.attribute(null, ATTR_KEY, key); 1510 1511 if (value instanceof Boolean) { 1512 serializer.attribute(null, ATTR_VALUE_TYPE, ATTR_TYPE_BOOLEAN); 1513 serializer.text(value.toString()); 1514 } else if (value == null || value instanceof String) { 1515 serializer.attribute(null, ATTR_VALUE_TYPE, ATTR_TYPE_STRING); 1516 serializer.text(value != null ? (String) value : ""); 1517 } else { 1518 serializer.attribute(null, ATTR_VALUE_TYPE, ATTR_TYPE_STRING_ARRAY); 1519 String[] values = (String[]) value; 1520 serializer.attribute(null, ATTR_MULTIPLE, Integer.toString(values.length)); 1521 for (String choice : values) { 1522 serializer.startTag(null, TAG_VALUE); 1523 serializer.text(choice != null ? choice : ""); 1524 serializer.endTag(null, TAG_VALUE); 1525 } 1526 } 1527 serializer.endTag(null, TAG_ENTRY); 1528 } 1529 1530 serializer.endTag(null, TAG_RESTRICTIONS); 1531 1532 serializer.endDocument(); 1533 restrictionsFile.finishWrite(fos); 1534 } catch (Exception e) { 1535 restrictionsFile.failWrite(fos); 1536 Slog.e(LOG_TAG, "Error writing application restrictions list"); 1537 } 1538 } 1539 1540 @Override 1541 public int getUserSerialNumber(int userHandle) { 1542 synchronized (mPackagesLock) { 1543 if (!exists(userHandle)) return -1; 1544 return getUserInfoLocked(userHandle).serialNumber; 1545 } 1546 } 1547 1548 @Override 1549 public int getUserHandle(int userSerialNumber) { 1550 synchronized (mPackagesLock) { 1551 for (int userId : mUserIds) { 1552 if (getUserInfoLocked(userId).serialNumber == userSerialNumber) return userId; 1553 } 1554 // Not found 1555 return -1; 1556 } 1557 } 1558 1559 /** 1560 * Caches the list of user ids in an array, adjusting the array size when necessary. 1561 */ 1562 private void updateUserIdsLocked() { 1563 int num = 0; 1564 for (int i = 0; i < mUsers.size(); i++) { 1565 if (!mUsers.valueAt(i).partial) { 1566 num++; 1567 } 1568 } 1569 final int[] newUsers = new int[num]; 1570 int n = 0; 1571 for (int i = 0; i < mUsers.size(); i++) { 1572 if (!mUsers.valueAt(i).partial) { 1573 newUsers[n++] = mUsers.keyAt(i); 1574 } 1575 } 1576 mUserIds = newUsers; 1577 } 1578 1579 /** 1580 * Make a note of the last started time of a user and do some cleanup. 1581 * @param userId the user that was just foregrounded 1582 */ 1583 public void userForeground(int userId) { 1584 synchronized (mPackagesLock) { 1585 UserInfo user = mUsers.get(userId); 1586 long now = System.currentTimeMillis(); 1587 if (user == null || user.partial) { 1588 Slog.w(LOG_TAG, "userForeground: unknown user #" + userId); 1589 return; 1590 } 1591 if (now > EPOCH_PLUS_30_YEARS) { 1592 user.lastLoggedInTime = now; 1593 writeUserLocked(user); 1594 } 1595 // If this is not a restricted profile and there is no restrictions pin, clean up 1596 // all restrictions files that might have been left behind, else clean up just the 1597 // ones with uninstalled packages 1598 RestrictionsPinState pinState = mRestrictionsPinStates.get(userId); 1599 final long salt = pinState == null ? 0 : pinState.salt; 1600 cleanAppRestrictions(userId, (!user.isRestricted() && salt == 0)); 1601 } 1602 } 1603 1604 /** 1605 * Returns the next available user id, filling in any holes in the ids. 1606 * TODO: May not be a good idea to recycle ids, in case it results in confusion 1607 * for data and battery stats collection, or unexpected cross-talk. 1608 * @return 1609 */ 1610 private int getNextAvailableIdLocked() { 1611 synchronized (mPackagesLock) { 1612 int i = MIN_USER_ID; 1613 while (i < Integer.MAX_VALUE) { 1614 if (mUsers.indexOfKey(i) < 0 && !mRemovingUserIds.get(i)) { 1615 break; 1616 } 1617 i++; 1618 } 1619 return i; 1620 } 1621 } 1622 1623 private String packageToRestrictionsFileName(String packageName) { 1624 return RESTRICTIONS_FILE_PREFIX + packageName + XML_SUFFIX; 1625 } 1626 1627 private String restrictionsFileNameToPackage(String fileName) { 1628 return fileName.substring(RESTRICTIONS_FILE_PREFIX.length(), 1629 (int) (fileName.length() - XML_SUFFIX.length())); 1630 } 1631 1632 @Override 1633 protected void dump(FileDescriptor fd, PrintWriter pw, String[] args) { 1634 if (mContext.checkCallingOrSelfPermission(android.Manifest.permission.DUMP) 1635 != PackageManager.PERMISSION_GRANTED) { 1636 pw.println("Permission Denial: can't dump UserManager from from pid=" 1637 + Binder.getCallingPid() 1638 + ", uid=" + Binder.getCallingUid() 1639 + " without permission " 1640 + android.Manifest.permission.DUMP); 1641 return; 1642 } 1643 1644 long now = System.currentTimeMillis(); 1645 StringBuilder sb = new StringBuilder(); 1646 synchronized (mPackagesLock) { 1647 pw.println("Users:"); 1648 for (int i = 0; i < mUsers.size(); i++) { 1649 UserInfo user = mUsers.valueAt(i); 1650 if (user == null) continue; 1651 pw.print(" "); pw.print(user); pw.print(" serialNo="); pw.print(user.serialNumber); 1652 if (mRemovingUserIds.get(mUsers.keyAt(i))) pw.print(" <removing> "); 1653 if (user.partial) pw.print(" <partial>"); 1654 pw.println(); 1655 pw.print(" Created: "); 1656 if (user.creationTime == 0) { 1657 pw.println("<unknown>"); 1658 } else { 1659 sb.setLength(0); 1660 TimeUtils.formatDuration(now - user.creationTime, sb); 1661 sb.append(" ago"); 1662 pw.println(sb); 1663 } 1664 pw.print(" Last logged in: "); 1665 if (user.lastLoggedInTime == 0) { 1666 pw.println("<unknown>"); 1667 } else { 1668 sb.setLength(0); 1669 TimeUtils.formatDuration(now - user.lastLoggedInTime, sb); 1670 sb.append(" ago"); 1671 pw.println(sb); 1672 } 1673 } 1674 } 1675 } 1676 1677 private PackageMonitor mUserPackageMonitor = new PackageMonitor() { 1678 @Override 1679 public void onPackageRemoved(String pkg, int uid) { 1680 final int userId = this.getChangingUserId(); 1681 // Package could be disappearing because it is being blocked, so also check if 1682 // it has been uninstalled. 1683 final boolean uninstalled = isPackageDisappearing(pkg) == PACKAGE_PERMANENT_CHANGE; 1684 if (uninstalled && userId >= 0 && !isPackageInstalled(pkg, userId)) { 1685 cleanAppRestrictionsForPackage(pkg, userId); 1686 } 1687 } 1688 }; 1689} 1690