UserManagerService.java revision 75175025f8d727d9841308fa0afcb9a7a1a118cd
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.ServiceManager; 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.app.IAppOpsService; 55import com.android.internal.content.PackageMonitor; 56import com.android.internal.util.ArrayUtils; 57import com.android.internal.util.FastXmlSerializer; 58 59import org.xmlpull.v1.XmlPullParser; 60import org.xmlpull.v1.XmlPullParserException; 61import org.xmlpull.v1.XmlSerializer; 62 63import java.io.BufferedOutputStream; 64import java.io.File; 65import java.io.FileDescriptor; 66import java.io.FileInputStream; 67import java.io.FileNotFoundException; 68import java.io.FileOutputStream; 69import java.io.IOException; 70import java.io.PrintWriter; 71import java.security.MessageDigest; 72import java.security.NoSuchAlgorithmException; 73import java.security.SecureRandom; 74import java.util.ArrayList; 75import java.util.List; 76 77public class UserManagerService extends IUserManager.Stub { 78 79 private static final String LOG_TAG = "UserManagerService"; 80 81 private static final boolean DBG = false; 82 83 private static final String TAG_NAME = "name"; 84 private static final String ATTR_FLAGS = "flags"; 85 private static final String ATTR_ICON_PATH = "icon"; 86 private static final String ATTR_ID = "id"; 87 private static final String ATTR_CREATION_TIME = "created"; 88 private static final String ATTR_LAST_LOGGED_IN_TIME = "lastLoggedIn"; 89 private static final String ATTR_SALT = "salt"; 90 private static final String ATTR_PIN_HASH = "pinHash"; 91 private static final String ATTR_FAILED_ATTEMPTS = "failedAttempts"; 92 private static final String ATTR_LAST_RETRY_MS = "lastAttemptMs"; 93 private static final String ATTR_SERIAL_NO = "serialNumber"; 94 private static final String ATTR_NEXT_SERIAL_NO = "nextSerialNumber"; 95 private static final String ATTR_PARTIAL = "partial"; 96 private static final String ATTR_USER_VERSION = "version"; 97 private static final String ATTR_PROFILE_GROUP_ID = "profileGroupId"; 98 private static final String TAG_USERS = "users"; 99 private static final String TAG_USER = "user"; 100 private static final String TAG_RESTRICTIONS = "restrictions"; 101 private static final String TAG_ENTRY = "entry"; 102 private static final String TAG_VALUE = "value"; 103 private static final String ATTR_KEY = "key"; 104 private static final String ATTR_VALUE_TYPE = "type"; 105 private static final String ATTR_MULTIPLE = "m"; 106 107 private static final String ATTR_TYPE_STRING_ARRAY = "sa"; 108 private static final String ATTR_TYPE_STRING = "s"; 109 private static final String ATTR_TYPE_BOOLEAN = "b"; 110 private static final String ATTR_TYPE_INTEGER = "i"; 111 112 private static final String USER_INFO_DIR = "system" + File.separator + "users"; 113 private static final String USER_LIST_FILENAME = "userlist.xml"; 114 private static final String USER_PHOTO_FILENAME = "photo.png"; 115 116 private static final String RESTRICTIONS_FILE_PREFIX = "res_"; 117 private static final String XML_SUFFIX = ".xml"; 118 119 private static final int MIN_USER_ID = 10; 120 121 private static final int USER_VERSION = 4; 122 123 private static final long EPOCH_PLUS_30_YEARS = 30L * 365 * 24 * 60 * 60 * 1000L; // ms 124 125 // Number of attempts before jumping to the next BACKOFF_TIMES slot 126 private static final int BACKOFF_INC_INTERVAL = 5; 127 128 // Amount of time to force the user to wait before entering the PIN again, after failing 129 // BACKOFF_INC_INTERVAL times. 130 private static final int[] BACKOFF_TIMES = { 0, 30*1000, 60*1000, 5*60*1000, 30*60*1000 }; 131 132 private final Context mContext; 133 private final PackageManagerService mPm; 134 private final Object mInstallLock; 135 private final Object mPackagesLock; 136 137 private final Handler mHandler; 138 139 private final File mUsersDir; 140 private final File mUserListFile; 141 private final File mBaseUserPath; 142 143 private final SparseArray<UserInfo> mUsers = new SparseArray<UserInfo>(); 144 private final SparseArray<Bundle> mUserRestrictions = new SparseArray<Bundle>(); 145 146 class RestrictionsPinState { 147 long salt; 148 String pinHash; 149 int failedAttempts; 150 long lastAttemptTime; 151 } 152 153 private final SparseArray<RestrictionsPinState> mRestrictionsPinStates = 154 new SparseArray<RestrictionsPinState>(); 155 156 /** 157 * Set of user IDs being actively removed. Removed IDs linger in this set 158 * for several seconds to work around a VFS caching issue. 159 */ 160 // @GuardedBy("mPackagesLock") 161 private final SparseBooleanArray mRemovingUserIds = new SparseBooleanArray(); 162 163 private int[] mUserIds; 164 private int mNextSerialNumber; 165 private int mUserVersion = 0; 166 167 private IAppOpsService mAppOpsService; 168 169 private static UserManagerService sInstance; 170 171 public static UserManagerService getInstance() { 172 synchronized (UserManagerService.class) { 173 return sInstance; 174 } 175 } 176 177 /** 178 * Available for testing purposes. 179 */ 180 UserManagerService(File dataDir, File baseUserPath) { 181 this(null, null, new Object(), new Object(), dataDir, baseUserPath); 182 } 183 184 /** 185 * Called by package manager to create the service. This is closely 186 * associated with the package manager, and the given lock is the 187 * package manager's own lock. 188 */ 189 UserManagerService(Context context, PackageManagerService pm, 190 Object installLock, Object packagesLock) { 191 this(context, pm, installLock, packagesLock, 192 Environment.getDataDirectory(), 193 new File(Environment.getDataDirectory(), "user")); 194 } 195 196 /** 197 * Available for testing purposes. 198 */ 199 private UserManagerService(Context context, PackageManagerService pm, 200 Object installLock, Object packagesLock, 201 File dataDir, File baseUserPath) { 202 mContext = context; 203 mPm = pm; 204 mInstallLock = installLock; 205 mPackagesLock = packagesLock; 206 mHandler = new Handler(); 207 synchronized (mInstallLock) { 208 synchronized (mPackagesLock) { 209 mUsersDir = new File(dataDir, USER_INFO_DIR); 210 mUsersDir.mkdirs(); 211 // Make zeroth user directory, for services to migrate their files to that location 212 File userZeroDir = new File(mUsersDir, "0"); 213 userZeroDir.mkdirs(); 214 mBaseUserPath = baseUserPath; 215 FileUtils.setPermissions(mUsersDir.toString(), 216 FileUtils.S_IRWXU|FileUtils.S_IRWXG 217 |FileUtils.S_IROTH|FileUtils.S_IXOTH, 218 -1, -1); 219 mUserListFile = new File(mUsersDir, USER_LIST_FILENAME); 220 readUserListLocked(); 221 // Prune out any partially created/partially removed users. 222 ArrayList<UserInfo> partials = new ArrayList<UserInfo>(); 223 for (int i = 0; i < mUsers.size(); i++) { 224 UserInfo ui = mUsers.valueAt(i); 225 if (ui.partial && i != 0) { 226 partials.add(ui); 227 } 228 } 229 for (int i = 0; i < partials.size(); i++) { 230 UserInfo ui = partials.get(i); 231 Slog.w(LOG_TAG, "Removing partially created user #" + i 232 + " (name=" + ui.name + ")"); 233 removeUserStateLocked(ui.id); 234 } 235 sInstance = this; 236 } 237 } 238 } 239 240 void systemReady() { 241 mUserPackageMonitor.register(mContext, null, UserHandle.ALL, false); 242 userForeground(UserHandle.USER_OWNER); 243 mAppOpsService = IAppOpsService.Stub.asInterface( 244 ServiceManager.getService(Context.APP_OPS_SERVICE)); 245 for (int i = 0; i < mUserIds.length; ++i) { 246 try { 247 mAppOpsService.setUserRestrictions(mUserRestrictions.get(mUserIds[i]), mUserIds[i]); 248 } catch (RemoteException e) { 249 Log.w(LOG_TAG, "Unable to notify AppOpsService of UserRestrictions"); 250 } 251 } 252 } 253 254 @Override 255 public List<UserInfo> getUsers(boolean excludeDying) { 256 checkManageUsersPermission("query users"); 257 synchronized (mPackagesLock) { 258 ArrayList<UserInfo> users = new ArrayList<UserInfo>(mUsers.size()); 259 for (int i = 0; i < mUsers.size(); i++) { 260 UserInfo ui = mUsers.valueAt(i); 261 if (ui.partial) { 262 continue; 263 } 264 if (!excludeDying || !mRemovingUserIds.get(ui.id)) { 265 users.add(ui); 266 } 267 } 268 return users; 269 } 270 } 271 272 @Override 273 public List<UserInfo> getProfiles(int userId, boolean enabledOnly) { 274 if (userId != UserHandle.getCallingUserId()) { 275 checkManageUsersPermission("getting profiles related to user " + userId); 276 } 277 final long ident = Binder.clearCallingIdentity(); 278 try { 279 synchronized (mPackagesLock) { 280 return getProfilesLocked(userId, enabledOnly); 281 } 282 } finally { 283 Binder.restoreCallingIdentity(ident); 284 } 285 } 286 287 /** Assume permissions already checked and caller's identity cleared */ 288 private List<UserInfo> getProfilesLocked(int userId, boolean enabledOnly) { 289 UserInfo user = getUserInfoLocked(userId); 290 ArrayList<UserInfo> users = new ArrayList<UserInfo>(mUsers.size()); 291 for (int i = 0; i < mUsers.size(); i++) { 292 UserInfo profile = mUsers.valueAt(i); 293 if (!isProfileOf(user, profile)) { 294 continue; 295 } 296 if (enabledOnly && !profile.isEnabled()) { 297 continue; 298 } 299 users.add(profile); 300 } 301 return users; 302 } 303 304 @Override 305 public UserInfo getProfileParent(int userHandle) { 306 checkManageUsersPermission("get the profile parent"); 307 synchronized (mPackagesLock) { 308 UserInfo profile = getUserInfoLocked(userHandle); 309 int parentUserId = profile.profileGroupId; 310 if (parentUserId == UserInfo.NO_PROFILE_GROUP_ID) { 311 return null; 312 } else { 313 return getUserInfoLocked(parentUserId); 314 } 315 } 316 } 317 318 private boolean isProfileOf(UserInfo user, UserInfo profile) { 319 return user.id == profile.id || 320 (user.profileGroupId != UserInfo.NO_PROFILE_GROUP_ID 321 && user.profileGroupId == profile.profileGroupId); 322 } 323 324 @Override 325 public void setUserEnabled(int userId) { 326 checkManageUsersPermission("enable user"); 327 synchronized (mPackagesLock) { 328 UserInfo info = getUserInfoLocked(userId); 329 if (info != null && !info.isEnabled()) { 330 info.flags ^= UserInfo.FLAG_DISABLED; 331 writeUserLocked(info); 332 } 333 } 334 } 335 336 @Override 337 public UserInfo getUserInfo(int userId) { 338 checkManageUsersPermission("query user"); 339 synchronized (mPackagesLock) { 340 return getUserInfoLocked(userId); 341 } 342 } 343 344 @Override 345 public boolean isRestricted() { 346 synchronized (mPackagesLock) { 347 return getUserInfoLocked(UserHandle.getCallingUserId()).isRestricted(); 348 } 349 } 350 351 /* 352 * Should be locked on mUsers before calling this. 353 */ 354 private UserInfo getUserInfoLocked(int userId) { 355 UserInfo ui = mUsers.get(userId); 356 // If it is partial and not in the process of being removed, return as unknown user. 357 if (ui != null && ui.partial && !mRemovingUserIds.get(userId)) { 358 Slog.w(LOG_TAG, "getUserInfo: unknown user #" + userId); 359 return null; 360 } 361 return ui; 362 } 363 364 public boolean exists(int userId) { 365 synchronized (mPackagesLock) { 366 return ArrayUtils.contains(mUserIds, userId); 367 } 368 } 369 370 @Override 371 public void setUserName(int userId, String name) { 372 checkManageUsersPermission("rename users"); 373 boolean changed = false; 374 synchronized (mPackagesLock) { 375 UserInfo info = mUsers.get(userId); 376 if (info == null || info.partial) { 377 Slog.w(LOG_TAG, "setUserName: unknown user #" + userId); 378 return; 379 } 380 if (name != null && !name.equals(info.name)) { 381 info.name = name; 382 writeUserLocked(info); 383 changed = true; 384 } 385 } 386 if (changed) { 387 sendUserInfoChangedBroadcast(userId); 388 } 389 } 390 391 @Override 392 public void setUserIcon(int userId, Bitmap bitmap) { 393 checkManageUsersPermission("update users"); 394 synchronized (mPackagesLock) { 395 UserInfo info = mUsers.get(userId); 396 if (info == null || info.partial) { 397 Slog.w(LOG_TAG, "setUserIcon: unknown user #" + userId); 398 return; 399 } 400 writeBitmapLocked(info, bitmap); 401 writeUserLocked(info); 402 } 403 sendUserInfoChangedBroadcast(userId); 404 } 405 406 private void sendUserInfoChangedBroadcast(int userId) { 407 Intent changedIntent = new Intent(Intent.ACTION_USER_INFO_CHANGED); 408 changedIntent.putExtra(Intent.EXTRA_USER_HANDLE, userId); 409 changedIntent.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY); 410 mContext.sendBroadcastAsUser(changedIntent, UserHandle.ALL); 411 } 412 413 @Override 414 public Bitmap getUserIcon(int userId) { 415 synchronized (mPackagesLock) { 416 UserInfo info = mUsers.get(userId); 417 if (info == null || info.partial) { 418 Slog.w(LOG_TAG, "getUserIcon: unknown user #" + userId); 419 return null; 420 } 421 int callingGroupId = mUsers.get(UserHandle.getCallingUserId()).profileGroupId; 422 if (callingGroupId == UserInfo.NO_PROFILE_GROUP_ID 423 || callingGroupId != info.profileGroupId) { 424 checkManageUsersPermission("get the icon of a user who is not related"); 425 } 426 if (info.iconPath == null) { 427 return null; 428 } 429 return BitmapFactory.decodeFile(info.iconPath); 430 } 431 } 432 433 public void makeInitialized(int userId) { 434 checkManageUsersPermission("makeInitialized"); 435 synchronized (mPackagesLock) { 436 UserInfo info = mUsers.get(userId); 437 if (info == null || info.partial) { 438 Slog.w(LOG_TAG, "makeInitialized: unknown user #" + userId); 439 } 440 if ((info.flags&UserInfo.FLAG_INITIALIZED) == 0) { 441 info.flags |= UserInfo.FLAG_INITIALIZED; 442 writeUserLocked(info); 443 } 444 } 445 } 446 447 @Override 448 public Bundle getUserRestrictions(int userId) { 449 // checkManageUsersPermission("getUserRestrictions"); 450 451 synchronized (mPackagesLock) { 452 Bundle restrictions = mUserRestrictions.get(userId); 453 return restrictions != null ? new Bundle(restrictions) : new Bundle(); 454 } 455 } 456 457 @Override 458 public void setUserRestrictions(Bundle restrictions, int userId) { 459 checkManageUsersPermission("setUserRestrictions"); 460 if (restrictions == null) return; 461 462 synchronized (mPackagesLock) { 463 mUserRestrictions.get(userId).clear(); 464 mUserRestrictions.get(userId).putAll(restrictions); 465 long token = Binder.clearCallingIdentity(); 466 try { 467 mAppOpsService.setUserRestrictions(mUserRestrictions.get(userId), userId); 468 } catch (RemoteException e) { 469 Log.w(LOG_TAG, "Unable to notify AppOpsService of UserRestrictions"); 470 } finally { 471 Binder.restoreCallingIdentity(token); 472 } 473 writeUserLocked(mUsers.get(userId)); 474 } 475 } 476 477 /** 478 * Check if we've hit the limit of how many users can be created. 479 */ 480 private boolean isUserLimitReachedLocked() { 481 int aliveUserCount = 0; 482 final int totalUserCount = mUsers.size(); 483 // Skip over users being removed 484 for (int i = 0; i < totalUserCount; i++) { 485 UserInfo user = mUsers.valueAt(i); 486 if (!mRemovingUserIds.get(user.id)) { 487 aliveUserCount++; 488 } 489 } 490 return aliveUserCount >= UserManager.getMaxSupportedUsers(); 491 } 492 493 /** 494 * Enforces that only the system UID or root's UID or apps that have the 495 * {@link android.Manifest.permission#MANAGE_USERS MANAGE_USERS} 496 * permission can make certain calls to the UserManager. 497 * 498 * @param message used as message if SecurityException is thrown 499 * @throws SecurityException if the caller is not system or root 500 */ 501 private static final void checkManageUsersPermission(String message) { 502 final int uid = Binder.getCallingUid(); 503 if (uid != Process.SYSTEM_UID && uid != 0 504 && ActivityManager.checkComponentPermission( 505 android.Manifest.permission.MANAGE_USERS, 506 uid, -1, true) != PackageManager.PERMISSION_GRANTED) { 507 throw new SecurityException("You need MANAGE_USERS permission to: " + message); 508 } 509 } 510 511 private void writeBitmapLocked(UserInfo info, Bitmap bitmap) { 512 try { 513 File dir = new File(mUsersDir, Integer.toString(info.id)); 514 File file = new File(dir, USER_PHOTO_FILENAME); 515 if (!dir.exists()) { 516 dir.mkdir(); 517 FileUtils.setPermissions( 518 dir.getPath(), 519 FileUtils.S_IRWXU|FileUtils.S_IRWXG|FileUtils.S_IXOTH, 520 -1, -1); 521 } 522 FileOutputStream os; 523 if (bitmap.compress(Bitmap.CompressFormat.PNG, 100, os = new FileOutputStream(file))) { 524 info.iconPath = file.getAbsolutePath(); 525 } 526 try { 527 os.close(); 528 } catch (IOException ioe) { 529 // What the ... ! 530 } 531 } catch (FileNotFoundException e) { 532 Slog.w(LOG_TAG, "Error setting photo for user ", e); 533 } 534 } 535 536 /** 537 * Returns an array of user ids. This array is cached here for quick access, so do not modify or 538 * cache it elsewhere. 539 * @return the array of user ids. 540 */ 541 public int[] getUserIds() { 542 synchronized (mPackagesLock) { 543 return mUserIds; 544 } 545 } 546 547 int[] getUserIdsLPr() { 548 return mUserIds; 549 } 550 551 private void readUserListLocked() { 552 if (!mUserListFile.exists()) { 553 fallbackToSingleUserLocked(); 554 return; 555 } 556 FileInputStream fis = null; 557 AtomicFile userListFile = new AtomicFile(mUserListFile); 558 try { 559 fis = userListFile.openRead(); 560 XmlPullParser parser = Xml.newPullParser(); 561 parser.setInput(fis, null); 562 int type; 563 while ((type = parser.next()) != XmlPullParser.START_TAG 564 && type != XmlPullParser.END_DOCUMENT) { 565 ; 566 } 567 568 if (type != XmlPullParser.START_TAG) { 569 Slog.e(LOG_TAG, "Unable to read user list"); 570 fallbackToSingleUserLocked(); 571 return; 572 } 573 574 mNextSerialNumber = -1; 575 if (parser.getName().equals(TAG_USERS)) { 576 String lastSerialNumber = parser.getAttributeValue(null, ATTR_NEXT_SERIAL_NO); 577 if (lastSerialNumber != null) { 578 mNextSerialNumber = Integer.parseInt(lastSerialNumber); 579 } 580 String versionNumber = parser.getAttributeValue(null, ATTR_USER_VERSION); 581 if (versionNumber != null) { 582 mUserVersion = Integer.parseInt(versionNumber); 583 } 584 } 585 586 while ((type = parser.next()) != XmlPullParser.END_DOCUMENT) { 587 if (type == XmlPullParser.START_TAG && parser.getName().equals(TAG_USER)) { 588 String id = parser.getAttributeValue(null, ATTR_ID); 589 UserInfo user = readUserLocked(Integer.parseInt(id)); 590 591 if (user != null) { 592 mUsers.put(user.id, user); 593 if (mNextSerialNumber < 0 || mNextSerialNumber <= user.id) { 594 mNextSerialNumber = user.id + 1; 595 } 596 } 597 } 598 } 599 updateUserIdsLocked(); 600 upgradeIfNecessaryLocked(); 601 } catch (IOException ioe) { 602 fallbackToSingleUserLocked(); 603 } catch (XmlPullParserException pe) { 604 fallbackToSingleUserLocked(); 605 } finally { 606 if (fis != null) { 607 try { 608 fis.close(); 609 } catch (IOException e) { 610 } 611 } 612 } 613 } 614 615 /** 616 * Upgrade steps between versions, either for fixing bugs or changing the data format. 617 */ 618 private void upgradeIfNecessaryLocked() { 619 int userVersion = mUserVersion; 620 if (userVersion < 1) { 621 // Assign a proper name for the owner, if not initialized correctly before 622 UserInfo user = mUsers.get(UserHandle.USER_OWNER); 623 if ("Primary".equals(user.name)) { 624 user.name = mContext.getResources().getString(com.android.internal.R.string.owner_name); 625 writeUserLocked(user); 626 } 627 userVersion = 1; 628 } 629 630 if (userVersion < 2) { 631 // Owner should be marked as initialized 632 UserInfo user = mUsers.get(UserHandle.USER_OWNER); 633 if ((user.flags & UserInfo.FLAG_INITIALIZED) == 0) { 634 user.flags |= UserInfo.FLAG_INITIALIZED; 635 writeUserLocked(user); 636 } 637 userVersion = 2; 638 } 639 640 641 if (userVersion < 4) { 642 userVersion = 4; 643 } 644 645 if (userVersion < USER_VERSION) { 646 Slog.w(LOG_TAG, "User version " + mUserVersion + " didn't upgrade as expected to " 647 + USER_VERSION); 648 } else { 649 mUserVersion = userVersion; 650 writeUserListLocked(); 651 } 652 } 653 654 private void fallbackToSingleUserLocked() { 655 // Create the primary user 656 UserInfo primary = new UserInfo(UserHandle.USER_OWNER, 657 mContext.getResources().getString(com.android.internal.R.string.owner_name), null, 658 UserInfo.FLAG_ADMIN | UserInfo.FLAG_PRIMARY | UserInfo.FLAG_INITIALIZED); 659 mUsers.put(0, primary); 660 mNextSerialNumber = MIN_USER_ID; 661 mUserVersion = USER_VERSION; 662 663 Bundle restrictions = new Bundle(); 664 mUserRestrictions.append(UserHandle.USER_OWNER, restrictions); 665 666 updateUserIdsLocked(); 667 668 writeUserListLocked(); 669 writeUserLocked(primary); 670 } 671 672 /* 673 * Writes the user file in this format: 674 * 675 * <user flags="20039023" id="0"> 676 * <name>Primary</name> 677 * </user> 678 */ 679 private void writeUserLocked(UserInfo userInfo) { 680 FileOutputStream fos = null; 681 AtomicFile userFile = new AtomicFile(new File(mUsersDir, userInfo.id + XML_SUFFIX)); 682 try { 683 fos = userFile.startWrite(); 684 final BufferedOutputStream bos = new BufferedOutputStream(fos); 685 686 // XmlSerializer serializer = XmlUtils.serializerInstance(); 687 final XmlSerializer serializer = new FastXmlSerializer(); 688 serializer.setOutput(bos, "utf-8"); 689 serializer.startDocument(null, true); 690 serializer.setFeature("http://xmlpull.org/v1/doc/features.html#indent-output", true); 691 692 serializer.startTag(null, TAG_USER); 693 serializer.attribute(null, ATTR_ID, Integer.toString(userInfo.id)); 694 serializer.attribute(null, ATTR_SERIAL_NO, Integer.toString(userInfo.serialNumber)); 695 serializer.attribute(null, ATTR_FLAGS, Integer.toString(userInfo.flags)); 696 serializer.attribute(null, ATTR_CREATION_TIME, Long.toString(userInfo.creationTime)); 697 serializer.attribute(null, ATTR_LAST_LOGGED_IN_TIME, 698 Long.toString(userInfo.lastLoggedInTime)); 699 RestrictionsPinState pinState = mRestrictionsPinStates.get(userInfo.id); 700 if (pinState != null) { 701 if (pinState.salt != 0) { 702 serializer.attribute(null, ATTR_SALT, Long.toString(pinState.salt)); 703 } 704 if (pinState.pinHash != null) { 705 serializer.attribute(null, ATTR_PIN_HASH, pinState.pinHash); 706 } 707 if (pinState.failedAttempts != 0) { 708 serializer.attribute(null, ATTR_FAILED_ATTEMPTS, 709 Integer.toString(pinState.failedAttempts)); 710 serializer.attribute(null, ATTR_LAST_RETRY_MS, 711 Long.toString(pinState.lastAttemptTime)); 712 } 713 } 714 if (userInfo.iconPath != null) { 715 serializer.attribute(null, ATTR_ICON_PATH, userInfo.iconPath); 716 } 717 if (userInfo.partial) { 718 serializer.attribute(null, ATTR_PARTIAL, "true"); 719 } 720 if (userInfo.profileGroupId != UserInfo.NO_PROFILE_GROUP_ID) { 721 serializer.attribute(null, ATTR_PROFILE_GROUP_ID, 722 Integer.toString(userInfo.profileGroupId)); 723 } 724 725 serializer.startTag(null, TAG_NAME); 726 serializer.text(userInfo.name); 727 serializer.endTag(null, TAG_NAME); 728 729 Bundle restrictions = mUserRestrictions.get(userInfo.id); 730 if (restrictions != null) { 731 serializer.startTag(null, TAG_RESTRICTIONS); 732 writeBoolean(serializer, restrictions, UserManager.DISALLOW_CONFIG_WIFI); 733 writeBoolean(serializer, restrictions, UserManager.DISALLOW_MODIFY_ACCOUNTS); 734 writeBoolean(serializer, restrictions, UserManager.DISALLOW_INSTALL_APPS); 735 writeBoolean(serializer, restrictions, UserManager.DISALLOW_UNINSTALL_APPS); 736 writeBoolean(serializer, restrictions, UserManager.DISALLOW_SHARE_LOCATION); 737 writeBoolean(serializer, restrictions, 738 UserManager.DISALLOW_INSTALL_UNKNOWN_SOURCES); 739 writeBoolean(serializer, restrictions, UserManager.DISALLOW_CONFIG_BLUETOOTH); 740 writeBoolean(serializer, restrictions, UserManager.DISALLOW_USB_FILE_TRANSFER); 741 writeBoolean(serializer, restrictions, UserManager.DISALLOW_CONFIG_CREDENTIALS); 742 writeBoolean(serializer, restrictions, UserManager.DISALLOW_REMOVE_USER); 743 writeBoolean(serializer, restrictions, UserManager.DISALLOW_DEBUGGING_FEATURES); 744 writeBoolean(serializer, restrictions, UserManager.DISALLOW_CONFIG_VPN); 745 writeBoolean(serializer, restrictions, UserManager.DISALLOW_CONFIG_TETHERING); 746 writeBoolean(serializer, restrictions, UserManager.DISALLOW_FACTORY_RESET); 747 writeBoolean(serializer, restrictions, UserManager.DISALLOW_ADD_USER); 748 writeBoolean(serializer, restrictions, UserManager.ENSURE_VERIFY_APPS); 749 writeBoolean(serializer, restrictions, UserManager.DISALLOW_CONFIG_CELL_BROADCASTS); 750 writeBoolean(serializer, restrictions, UserManager.DISALLOW_CONFIG_MOBILE_NETWORKS); 751 writeBoolean(serializer, restrictions, UserManager.DISALLOW_APPS_CONTROL); 752 writeBoolean(serializer, restrictions, UserManager.DISALLOW_MOUNT_PHYSICAL_MEDIA); 753 writeBoolean(serializer, restrictions, UserManager.DISALLOW_UNMUTE_MICROPHONE); 754 writeBoolean(serializer, restrictions, UserManager.DISALLOW_ADJUST_VOLUME); 755 writeBoolean(serializer, restrictions, UserManager.DISALLOW_TELEPHONY); 756 serializer.endTag(null, TAG_RESTRICTIONS); 757 } 758 serializer.endTag(null, TAG_USER); 759 760 serializer.endDocument(); 761 userFile.finishWrite(fos); 762 } catch (Exception ioe) { 763 Slog.e(LOG_TAG, "Error writing user info " + userInfo.id + "\n" + ioe); 764 userFile.failWrite(fos); 765 } 766 } 767 768 /* 769 * Writes the user list file in this format: 770 * 771 * <users nextSerialNumber="3"> 772 * <user id="0"></user> 773 * <user id="2"></user> 774 * </users> 775 */ 776 private void writeUserListLocked() { 777 FileOutputStream fos = null; 778 AtomicFile userListFile = new AtomicFile(mUserListFile); 779 try { 780 fos = userListFile.startWrite(); 781 final BufferedOutputStream bos = new BufferedOutputStream(fos); 782 783 // XmlSerializer serializer = XmlUtils.serializerInstance(); 784 final XmlSerializer serializer = new FastXmlSerializer(); 785 serializer.setOutput(bos, "utf-8"); 786 serializer.startDocument(null, true); 787 serializer.setFeature("http://xmlpull.org/v1/doc/features.html#indent-output", true); 788 789 serializer.startTag(null, TAG_USERS); 790 serializer.attribute(null, ATTR_NEXT_SERIAL_NO, Integer.toString(mNextSerialNumber)); 791 serializer.attribute(null, ATTR_USER_VERSION, Integer.toString(mUserVersion)); 792 793 for (int i = 0; i < mUsers.size(); i++) { 794 UserInfo user = mUsers.valueAt(i); 795 serializer.startTag(null, TAG_USER); 796 serializer.attribute(null, ATTR_ID, Integer.toString(user.id)); 797 serializer.endTag(null, TAG_USER); 798 } 799 800 serializer.endTag(null, TAG_USERS); 801 802 serializer.endDocument(); 803 userListFile.finishWrite(fos); 804 } catch (Exception e) { 805 userListFile.failWrite(fos); 806 Slog.e(LOG_TAG, "Error writing user list"); 807 } 808 } 809 810 private UserInfo readUserLocked(int id) { 811 int flags = 0; 812 int serialNumber = id; 813 String name = null; 814 String iconPath = null; 815 long creationTime = 0L; 816 long lastLoggedInTime = 0L; 817 long salt = 0L; 818 String pinHash = null; 819 int failedAttempts = 0; 820 int profileGroupId = UserInfo.NO_PROFILE_GROUP_ID; 821 long lastAttemptTime = 0L; 822 boolean partial = false; 823 Bundle restrictions = new Bundle(); 824 825 FileInputStream fis = null; 826 try { 827 AtomicFile userFile = 828 new AtomicFile(new File(mUsersDir, Integer.toString(id) + XML_SUFFIX)); 829 fis = userFile.openRead(); 830 XmlPullParser parser = Xml.newPullParser(); 831 parser.setInput(fis, null); 832 int type; 833 while ((type = parser.next()) != XmlPullParser.START_TAG 834 && type != XmlPullParser.END_DOCUMENT) { 835 ; 836 } 837 838 if (type != XmlPullParser.START_TAG) { 839 Slog.e(LOG_TAG, "Unable to read user " + id); 840 return null; 841 } 842 843 if (type == XmlPullParser.START_TAG && parser.getName().equals(TAG_USER)) { 844 int storedId = readIntAttribute(parser, ATTR_ID, -1); 845 if (storedId != id) { 846 Slog.e(LOG_TAG, "User id does not match the file name"); 847 return null; 848 } 849 serialNumber = readIntAttribute(parser, ATTR_SERIAL_NO, id); 850 flags = readIntAttribute(parser, ATTR_FLAGS, 0); 851 iconPath = parser.getAttributeValue(null, ATTR_ICON_PATH); 852 creationTime = readLongAttribute(parser, ATTR_CREATION_TIME, 0); 853 lastLoggedInTime = readLongAttribute(parser, ATTR_LAST_LOGGED_IN_TIME, 0); 854 salt = readLongAttribute(parser, ATTR_SALT, 0L); 855 pinHash = parser.getAttributeValue(null, ATTR_PIN_HASH); 856 failedAttempts = readIntAttribute(parser, ATTR_FAILED_ATTEMPTS, 0); 857 lastAttemptTime = readLongAttribute(parser, ATTR_LAST_RETRY_MS, 0L); 858 profileGroupId = readIntAttribute(parser, ATTR_PROFILE_GROUP_ID, 859 UserInfo.NO_PROFILE_GROUP_ID); 860 if (profileGroupId == UserInfo.NO_PROFILE_GROUP_ID) { 861 // This attribute was added and renamed during development of L. 862 // TODO Remove upgrade path by 1st May 2014 863 profileGroupId = readIntAttribute(parser, "relatedGroupId", 864 UserInfo.NO_PROFILE_GROUP_ID); 865 } 866 String valueString = parser.getAttributeValue(null, ATTR_PARTIAL); 867 if ("true".equals(valueString)) { 868 partial = true; 869 } 870 871 int outerDepth = parser.getDepth(); 872 while ((type = parser.next()) != XmlPullParser.END_DOCUMENT 873 && (type != XmlPullParser.END_TAG || parser.getDepth() > outerDepth)) { 874 if (type == XmlPullParser.END_TAG || type == XmlPullParser.TEXT) { 875 continue; 876 } 877 String tag = parser.getName(); 878 if (TAG_NAME.equals(tag)) { 879 type = parser.next(); 880 if (type == XmlPullParser.TEXT) { 881 name = parser.getText(); 882 } 883 } else if (TAG_RESTRICTIONS.equals(tag)) { 884 readBoolean(parser, restrictions, UserManager.DISALLOW_CONFIG_WIFI); 885 readBoolean(parser, restrictions, UserManager.DISALLOW_MODIFY_ACCOUNTS); 886 readBoolean(parser, restrictions, UserManager.DISALLOW_INSTALL_APPS); 887 readBoolean(parser, restrictions, UserManager.DISALLOW_UNINSTALL_APPS); 888 readBoolean(parser, restrictions, UserManager.DISALLOW_SHARE_LOCATION); 889 readBoolean(parser, restrictions, 890 UserManager.DISALLOW_INSTALL_UNKNOWN_SOURCES); 891 readBoolean(parser, restrictions, UserManager.DISALLOW_CONFIG_BLUETOOTH); 892 readBoolean(parser, restrictions, UserManager.DISALLOW_USB_FILE_TRANSFER); 893 readBoolean(parser, restrictions, UserManager.DISALLOW_CONFIG_CREDENTIALS); 894 readBoolean(parser, restrictions, UserManager.DISALLOW_REMOVE_USER); 895 readBoolean(parser, restrictions, UserManager.DISALLOW_DEBUGGING_FEATURES); 896 readBoolean(parser, restrictions, UserManager.DISALLOW_CONFIG_VPN); 897 readBoolean(parser, restrictions, UserManager.DISALLOW_CONFIG_TETHERING); 898 readBoolean(parser, restrictions, UserManager.DISALLOW_FACTORY_RESET); 899 readBoolean(parser, restrictions, UserManager.DISALLOW_ADD_USER); 900 readBoolean(parser, restrictions, UserManager.ENSURE_VERIFY_APPS); 901 readBoolean(parser, restrictions, UserManager.DISALLOW_CONFIG_CELL_BROADCASTS); 902 readBoolean(parser, restrictions, UserManager.DISALLOW_CONFIG_MOBILE_NETWORKS); 903 readBoolean(parser, restrictions, UserManager.DISALLOW_APPS_CONTROL); 904 readBoolean(parser, restrictions, 905 UserManager.DISALLOW_MOUNT_PHYSICAL_MEDIA); 906 readBoolean(parser, restrictions, UserManager.DISALLOW_UNMUTE_MICROPHONE); 907 readBoolean(parser, restrictions, UserManager.DISALLOW_ADJUST_VOLUME); 908 readBoolean(parser, restrictions, UserManager.DISALLOW_TELEPHONY); 909 } 910 } 911 } 912 913 UserInfo userInfo = new UserInfo(id, name, iconPath, flags); 914 userInfo.serialNumber = serialNumber; 915 userInfo.creationTime = creationTime; 916 userInfo.lastLoggedInTime = lastLoggedInTime; 917 userInfo.partial = partial; 918 userInfo.profileGroupId = profileGroupId; 919 mUserRestrictions.append(id, restrictions); 920 if (salt != 0L) { 921 RestrictionsPinState pinState = mRestrictionsPinStates.get(id); 922 if (pinState == null) { 923 pinState = new RestrictionsPinState(); 924 mRestrictionsPinStates.put(id, pinState); 925 } 926 pinState.salt = salt; 927 pinState.pinHash = pinHash; 928 pinState.failedAttempts = failedAttempts; 929 pinState.lastAttemptTime = lastAttemptTime; 930 } 931 return userInfo; 932 933 } catch (IOException ioe) { 934 } catch (XmlPullParserException pe) { 935 } finally { 936 if (fis != null) { 937 try { 938 fis.close(); 939 } catch (IOException e) { 940 } 941 } 942 } 943 return null; 944 } 945 946 private void readBoolean(XmlPullParser parser, Bundle restrictions, 947 String restrictionKey) { 948 String value = parser.getAttributeValue(null, restrictionKey); 949 if (value != null) { 950 restrictions.putBoolean(restrictionKey, Boolean.parseBoolean(value)); 951 } 952 } 953 954 private void writeBoolean(XmlSerializer xml, Bundle restrictions, String restrictionKey) 955 throws IOException { 956 if (restrictions.containsKey(restrictionKey)) { 957 xml.attribute(null, restrictionKey, 958 Boolean.toString(restrictions.getBoolean(restrictionKey))); 959 } 960 } 961 962 private int readIntAttribute(XmlPullParser parser, String attr, int defaultValue) { 963 String valueString = parser.getAttributeValue(null, attr); 964 if (valueString == null) return defaultValue; 965 try { 966 return Integer.parseInt(valueString); 967 } catch (NumberFormatException nfe) { 968 return defaultValue; 969 } 970 } 971 972 private long readLongAttribute(XmlPullParser parser, String attr, long defaultValue) { 973 String valueString = parser.getAttributeValue(null, attr); 974 if (valueString == null) return defaultValue; 975 try { 976 return Long.parseLong(valueString); 977 } catch (NumberFormatException nfe) { 978 return defaultValue; 979 } 980 } 981 982 private boolean isPackageInstalled(String pkg, int userId) { 983 final ApplicationInfo info = mPm.getApplicationInfo(pkg, 984 PackageManager.GET_UNINSTALLED_PACKAGES, 985 userId); 986 if (info == null || (info.flags&ApplicationInfo.FLAG_INSTALLED) == 0) { 987 return false; 988 } 989 return true; 990 } 991 992 /** 993 * Removes all the restrictions files (res_<packagename>) for a given user, if all is true, 994 * else removes only those packages that have been uninstalled. 995 * Does not do any permissions checking. 996 */ 997 private void cleanAppRestrictions(int userId, boolean all) { 998 synchronized (mPackagesLock) { 999 File dir = Environment.getUserSystemDirectory(userId); 1000 String[] files = dir.list(); 1001 if (files == null) return; 1002 for (String fileName : files) { 1003 if (fileName.startsWith(RESTRICTIONS_FILE_PREFIX)) { 1004 File resFile = new File(dir, fileName); 1005 if (resFile.exists()) { 1006 if (all) { 1007 resFile.delete(); 1008 } else { 1009 String pkg = restrictionsFileNameToPackage(fileName); 1010 if (!isPackageInstalled(pkg, userId)) { 1011 resFile.delete(); 1012 } 1013 } 1014 } 1015 } 1016 } 1017 } 1018 } 1019 1020 /** 1021 * Removes the app restrictions file for a specific package and user id, if it exists. 1022 */ 1023 private void cleanAppRestrictionsForPackage(String pkg, int userId) { 1024 synchronized (mPackagesLock) { 1025 File dir = Environment.getUserSystemDirectory(userId); 1026 File resFile = new File(dir, packageToRestrictionsFileName(pkg)); 1027 if (resFile.exists()) { 1028 resFile.delete(); 1029 } 1030 } 1031 } 1032 1033 @Override 1034 public UserInfo createProfileForUser(String name, int flags, int userId) { 1035 checkManageUsersPermission("Only the system can create users"); 1036 if (userId != UserHandle.USER_OWNER) { 1037 Slog.w(LOG_TAG, "Only user owner can have profiles"); 1038 return null; 1039 } 1040 return createUserInternal(name, flags, userId); 1041 } 1042 1043 @Override 1044 public UserInfo createUser(String name, int flags) { 1045 checkManageUsersPermission("Only the system can create users"); 1046 return createUserInternal(name, flags, UserHandle.USER_NULL); 1047 } 1048 1049 private UserInfo createUserInternal(String name, int flags, int parentId) { 1050 if (getUserRestrictions(UserHandle.getCallingUserId()).getBoolean( 1051 UserManager.DISALLOW_ADD_USER, false)) { 1052 Log.w(LOG_TAG, "Cannot add user. DISALLOW_ADD_USER is enabled."); 1053 return null; 1054 } 1055 final long ident = Binder.clearCallingIdentity(); 1056 UserInfo userInfo = null; 1057 try { 1058 synchronized (mInstallLock) { 1059 synchronized (mPackagesLock) { 1060 UserInfo parent = null; 1061 if (parentId != UserHandle.USER_NULL) { 1062 parent = getUserInfoLocked(parentId); 1063 if (parent == null) return null; 1064 } 1065 if (isUserLimitReachedLocked()) return null; 1066 int userId = getNextAvailableIdLocked(); 1067 userInfo = new UserInfo(userId, name, null, flags); 1068 File userPath = new File(mBaseUserPath, Integer.toString(userId)); 1069 userInfo.serialNumber = mNextSerialNumber++; 1070 long now = System.currentTimeMillis(); 1071 userInfo.creationTime = (now > EPOCH_PLUS_30_YEARS) ? now : 0; 1072 userInfo.partial = true; 1073 Environment.getUserSystemDirectory(userInfo.id).mkdirs(); 1074 mUsers.put(userId, userInfo); 1075 writeUserListLocked(); 1076 if (parent != null) { 1077 if (parent.profileGroupId == UserInfo.NO_PROFILE_GROUP_ID) { 1078 parent.profileGroupId = parent.id; 1079 writeUserLocked(parent); 1080 } 1081 userInfo.profileGroupId = parent.profileGroupId; 1082 } 1083 writeUserLocked(userInfo); 1084 mPm.createNewUserLILPw(userId, userPath); 1085 userInfo.partial = false; 1086 writeUserLocked(userInfo); 1087 updateUserIdsLocked(); 1088 Bundle restrictions = new Bundle(); 1089 mUserRestrictions.append(userId, restrictions); 1090 } 1091 } 1092 if (userInfo != null) { 1093 Intent addedIntent = new Intent(Intent.ACTION_USER_ADDED); 1094 addedIntent.putExtra(Intent.EXTRA_USER_HANDLE, userInfo.id); 1095 mContext.sendBroadcastAsUser(addedIntent, UserHandle.ALL, 1096 android.Manifest.permission.MANAGE_USERS); 1097 } 1098 } finally { 1099 Binder.restoreCallingIdentity(ident); 1100 } 1101 return userInfo; 1102 } 1103 1104 /** 1105 * Removes a user and all data directories created for that user. This method should be called 1106 * after the user's processes have been terminated. 1107 * @param userHandle the user's id 1108 */ 1109 public boolean removeUser(int userHandle) { 1110 checkManageUsersPermission("Only the system can remove users"); 1111 long ident = Binder.clearCallingIdentity(); 1112 try { 1113 final UserInfo user; 1114 synchronized (mPackagesLock) { 1115 user = mUsers.get(userHandle); 1116 if (userHandle == 0 || user == null || mRemovingUserIds.get(userHandle)) { 1117 return false; 1118 } 1119 mRemovingUserIds.put(userHandle, true); 1120 try { 1121 mAppOpsService.removeUser(userHandle); 1122 } catch (RemoteException e) { 1123 Log.w(LOG_TAG, "Unable to notify AppOpsService of removing user", e); 1124 } 1125 // Set this to a partially created user, so that the user will be purged 1126 // on next startup, in case the runtime stops now before stopping and 1127 // removing the user completely. 1128 user.partial = true; 1129 // Mark it as disabled, so that it isn't returned any more when 1130 // profiles are queried. 1131 user.flags |= UserInfo.FLAG_DISABLED; 1132 writeUserLocked(user); 1133 } 1134 1135 if (user.profileGroupId != UserInfo.NO_PROFILE_GROUP_ID 1136 && user.isManagedProfile()) { 1137 // Send broadcast to notify system that the user removed was a 1138 // managed user. 1139 sendProfileRemovedBroadcast(user.profileGroupId, user.id); 1140 } 1141 1142 if (DBG) Slog.i(LOG_TAG, "Stopping user " + userHandle); 1143 int res; 1144 try { 1145 res = ActivityManagerNative.getDefault().stopUser(userHandle, 1146 new IStopUserCallback.Stub() { 1147 @Override 1148 public void userStopped(int userId) { 1149 finishRemoveUser(userId); 1150 } 1151 @Override 1152 public void userStopAborted(int userId) { 1153 } 1154 }); 1155 } catch (RemoteException e) { 1156 return false; 1157 } 1158 return res == ActivityManager.USER_OP_SUCCESS; 1159 } finally { 1160 Binder.restoreCallingIdentity(ident); 1161 } 1162 } 1163 1164 void finishRemoveUser(final int userHandle) { 1165 if (DBG) Slog.i(LOG_TAG, "finishRemoveUser " + userHandle); 1166 // Let other services shutdown any activity and clean up their state before completely 1167 // wiping the user's system directory and removing from the user list 1168 long ident = Binder.clearCallingIdentity(); 1169 try { 1170 Intent addedIntent = new Intent(Intent.ACTION_USER_REMOVED); 1171 addedIntent.putExtra(Intent.EXTRA_USER_HANDLE, userHandle); 1172 mContext.sendOrderedBroadcastAsUser(addedIntent, UserHandle.ALL, 1173 android.Manifest.permission.MANAGE_USERS, 1174 1175 new BroadcastReceiver() { 1176 @Override 1177 public void onReceive(Context context, Intent intent) { 1178 if (DBG) { 1179 Slog.i(LOG_TAG, 1180 "USER_REMOVED broadcast sent, cleaning up user data " 1181 + userHandle); 1182 } 1183 new Thread() { 1184 public void run() { 1185 synchronized (mInstallLock) { 1186 synchronized (mPackagesLock) { 1187 removeUserStateLocked(userHandle); 1188 } 1189 } 1190 } 1191 }.start(); 1192 } 1193 }, 1194 1195 null, Activity.RESULT_OK, null, null); 1196 } finally { 1197 Binder.restoreCallingIdentity(ident); 1198 } 1199 } 1200 1201 private void removeUserStateLocked(final int userHandle) { 1202 // Cleanup package manager settings 1203 mPm.cleanUpUserLILPw(userHandle); 1204 1205 // Remove this user from the list 1206 mUsers.remove(userHandle); 1207 1208 // Have user ID linger for several seconds to let external storage VFS 1209 // cache entries expire. This must be greater than the 'entry_valid' 1210 // timeout used by the FUSE daemon. 1211 mHandler.postDelayed(new Runnable() { 1212 @Override 1213 public void run() { 1214 synchronized (mPackagesLock) { 1215 mRemovingUserIds.delete(userHandle); 1216 } 1217 } 1218 }, MINUTE_IN_MILLIS); 1219 1220 mRestrictionsPinStates.remove(userHandle); 1221 // Remove user file 1222 AtomicFile userFile = new AtomicFile(new File(mUsersDir, userHandle + XML_SUFFIX)); 1223 userFile.delete(); 1224 // Update the user list 1225 writeUserListLocked(); 1226 updateUserIdsLocked(); 1227 removeDirectoryRecursive(Environment.getUserSystemDirectory(userHandle)); 1228 } 1229 1230 private void removeDirectoryRecursive(File parent) { 1231 if (parent.isDirectory()) { 1232 String[] files = parent.list(); 1233 for (String filename : files) { 1234 File child = new File(parent, filename); 1235 removeDirectoryRecursive(child); 1236 } 1237 } 1238 parent.delete(); 1239 } 1240 1241 private void sendProfileRemovedBroadcast(int parentUserId, int removedUserId) { 1242 Intent managedProfileIntent = new Intent(Intent.ACTION_MANAGED_PROFILE_REMOVED); 1243 managedProfileIntent.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY | 1244 Intent.FLAG_RECEIVER_FOREGROUND); 1245 managedProfileIntent.putExtra(Intent.EXTRA_USER, new UserHandle(removedUserId)); 1246 mContext.sendBroadcastAsUser(managedProfileIntent, new UserHandle(parentUserId), null); 1247 } 1248 1249 @Override 1250 public Bundle getApplicationRestrictions(String packageName) { 1251 return getApplicationRestrictionsForUser(packageName, UserHandle.getCallingUserId()); 1252 } 1253 1254 @Override 1255 public Bundle getApplicationRestrictionsForUser(String packageName, int userId) { 1256 if (UserHandle.getCallingUserId() != userId 1257 || !UserHandle.isSameApp(Binder.getCallingUid(), getUidForPackage(packageName))) { 1258 checkManageUsersPermission("Only system can get restrictions for other users/apps"); 1259 } 1260 synchronized (mPackagesLock) { 1261 // Read the restrictions from XML 1262 return readApplicationRestrictionsLocked(packageName, userId); 1263 } 1264 } 1265 1266 @Override 1267 public void setApplicationRestrictions(String packageName, Bundle restrictions, 1268 int userId) { 1269 if (UserHandle.getCallingUserId() != userId 1270 || !UserHandle.isSameApp(Binder.getCallingUid(), getUidForPackage(packageName))) { 1271 checkManageUsersPermission("Only system can set restrictions for other users/apps"); 1272 } 1273 synchronized (mPackagesLock) { 1274 // Write the restrictions to XML 1275 writeApplicationRestrictionsLocked(packageName, restrictions, userId); 1276 } 1277 1278 // Notify package of changes via an intent - only sent to explicitly registered receivers. 1279 Intent changeIntent = new Intent(Intent.ACTION_APPLICATION_RESTRICTIONS_CHANGED); 1280 changeIntent.setPackage(packageName); 1281 changeIntent.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY); 1282 mContext.sendBroadcastAsUser(changeIntent, new UserHandle(userId)); 1283 } 1284 1285 @Override 1286 public boolean setRestrictionsChallenge(String newPin) { 1287 checkManageUsersPermission("Only system can modify the restrictions pin"); 1288 int userId = UserHandle.getCallingUserId(); 1289 synchronized (mPackagesLock) { 1290 RestrictionsPinState pinState = mRestrictionsPinStates.get(userId); 1291 if (pinState == null) { 1292 pinState = new RestrictionsPinState(); 1293 } 1294 if (newPin == null) { 1295 pinState.salt = 0; 1296 pinState.pinHash = null; 1297 } else { 1298 try { 1299 pinState.salt = SecureRandom.getInstance("SHA1PRNG").nextLong(); 1300 } catch (NoSuchAlgorithmException e) { 1301 pinState.salt = (long) (Math.random() * Long.MAX_VALUE); 1302 } 1303 pinState.pinHash = passwordToHash(newPin, pinState.salt); 1304 pinState.failedAttempts = 0; 1305 } 1306 mRestrictionsPinStates.put(userId, pinState); 1307 writeUserLocked(mUsers.get(userId)); 1308 } 1309 return true; 1310 } 1311 1312 @Override 1313 public int checkRestrictionsChallenge(String pin) { 1314 checkManageUsersPermission("Only system can verify the restrictions pin"); 1315 int userId = UserHandle.getCallingUserId(); 1316 synchronized (mPackagesLock) { 1317 RestrictionsPinState pinState = mRestrictionsPinStates.get(userId); 1318 // If there's no pin set, return error code 1319 if (pinState == null || pinState.salt == 0 || pinState.pinHash == null) { 1320 return UserManager.PIN_VERIFICATION_FAILED_NOT_SET; 1321 } else if (pin == null) { 1322 // If just checking if user can be prompted, return remaining time 1323 int waitTime = getRemainingTimeForPinAttempt(pinState); 1324 Slog.d(LOG_TAG, "Remaining waittime peek=" + waitTime); 1325 return waitTime; 1326 } else { 1327 int waitTime = getRemainingTimeForPinAttempt(pinState); 1328 Slog.d(LOG_TAG, "Remaining waittime=" + waitTime); 1329 if (waitTime > 0) { 1330 return waitTime; 1331 } 1332 if (passwordToHash(pin, pinState.salt).equals(pinState.pinHash)) { 1333 pinState.failedAttempts = 0; 1334 writeUserLocked(mUsers.get(userId)); 1335 return UserManager.PIN_VERIFICATION_SUCCESS; 1336 } else { 1337 pinState.failedAttempts++; 1338 pinState.lastAttemptTime = System.currentTimeMillis(); 1339 writeUserLocked(mUsers.get(userId)); 1340 return waitTime; 1341 } 1342 } 1343 } 1344 } 1345 1346 private int getRemainingTimeForPinAttempt(RestrictionsPinState pinState) { 1347 int backoffIndex = Math.min(pinState.failedAttempts / BACKOFF_INC_INTERVAL, 1348 BACKOFF_TIMES.length - 1); 1349 int backoffTime = (pinState.failedAttempts % BACKOFF_INC_INTERVAL) == 0 ? 1350 BACKOFF_TIMES[backoffIndex] : 0; 1351 return (int) Math.max(backoffTime + pinState.lastAttemptTime - System.currentTimeMillis(), 1352 0); 1353 } 1354 1355 @Override 1356 public boolean hasRestrictionsChallenge() { 1357 int userId = UserHandle.getCallingUserId(); 1358 synchronized (mPackagesLock) { 1359 return hasRestrictionsPinLocked(userId); 1360 } 1361 } 1362 1363 private boolean hasRestrictionsPinLocked(int userId) { 1364 RestrictionsPinState pinState = mRestrictionsPinStates.get(userId); 1365 if (pinState == null || pinState.salt == 0 || pinState.pinHash == null) { 1366 return false; 1367 } 1368 return true; 1369 } 1370 1371 @Override 1372 public void removeRestrictions() { 1373 checkManageUsersPermission("Only system can remove restrictions"); 1374 final int userHandle = UserHandle.getCallingUserId(); 1375 removeRestrictionsForUser(userHandle, true); 1376 } 1377 1378 private void removeRestrictionsForUser(final int userHandle, boolean unblockApps) { 1379 synchronized (mPackagesLock) { 1380 // Remove all user restrictions 1381 setUserRestrictions(new Bundle(), userHandle); 1382 // Remove restrictions pin 1383 setRestrictionsChallenge(null); 1384 // Remove any app restrictions 1385 cleanAppRestrictions(userHandle, true); 1386 } 1387 if (unblockApps) { 1388 unblockAllAppsForUser(userHandle); 1389 } 1390 } 1391 1392 private void unblockAllAppsForUser(final int userHandle) { 1393 mHandler.post(new Runnable() { 1394 @Override 1395 public void run() { 1396 List<ApplicationInfo> apps = 1397 mPm.getInstalledApplications(PackageManager.GET_UNINSTALLED_PACKAGES, 1398 userHandle).getList(); 1399 final long ident = Binder.clearCallingIdentity(); 1400 try { 1401 for (ApplicationInfo appInfo : apps) { 1402 if ((appInfo.flags & ApplicationInfo.FLAG_INSTALLED) != 0 1403 && (appInfo.flags & ApplicationInfo.FLAG_BLOCKED) != 0) { 1404 mPm.setApplicationBlockedSettingAsUser(appInfo.packageName, false, 1405 userHandle); 1406 } 1407 } 1408 } finally { 1409 Binder.restoreCallingIdentity(ident); 1410 } 1411 } 1412 }); 1413 } 1414 1415 /* 1416 * Generate a hash for the given password. To avoid brute force attacks, we use a salted hash. 1417 * Not the most secure, but it is at least a second level of protection. First level is that 1418 * the file is in a location only readable by the system process. 1419 * @param password the password. 1420 * @param salt the randomly generated salt 1421 * @return the hash of the pattern in a String. 1422 */ 1423 private String passwordToHash(String password, long salt) { 1424 if (password == null) { 1425 return null; 1426 } 1427 String algo = null; 1428 String hashed = salt + password; 1429 try { 1430 byte[] saltedPassword = (password + salt).getBytes(); 1431 byte[] sha1 = MessageDigest.getInstance(algo = "SHA-1").digest(saltedPassword); 1432 byte[] md5 = MessageDigest.getInstance(algo = "MD5").digest(saltedPassword); 1433 hashed = toHex(sha1) + toHex(md5); 1434 } catch (NoSuchAlgorithmException e) { 1435 Log.w(LOG_TAG, "Failed to encode string because of missing algorithm: " + algo); 1436 } 1437 return hashed; 1438 } 1439 1440 private static String toHex(byte[] ary) { 1441 final String hex = "0123456789ABCDEF"; 1442 String ret = ""; 1443 for (int i = 0; i < ary.length; i++) { 1444 ret += hex.charAt((ary[i] >> 4) & 0xf); 1445 ret += hex.charAt(ary[i] & 0xf); 1446 } 1447 return ret; 1448 } 1449 1450 private int getUidForPackage(String packageName) { 1451 long ident = Binder.clearCallingIdentity(); 1452 try { 1453 return mContext.getPackageManager().getApplicationInfo(packageName, 1454 PackageManager.GET_UNINSTALLED_PACKAGES).uid; 1455 } catch (NameNotFoundException nnfe) { 1456 return -1; 1457 } finally { 1458 Binder.restoreCallingIdentity(ident); 1459 } 1460 } 1461 1462 private Bundle readApplicationRestrictionsLocked(String packageName, 1463 int userId) { 1464 final Bundle restrictions = new Bundle(); 1465 final ArrayList<String> values = new ArrayList<String>(); 1466 1467 FileInputStream fis = null; 1468 try { 1469 AtomicFile restrictionsFile = 1470 new AtomicFile(new File(Environment.getUserSystemDirectory(userId), 1471 packageToRestrictionsFileName(packageName))); 1472 fis = restrictionsFile.openRead(); 1473 XmlPullParser parser = Xml.newPullParser(); 1474 parser.setInput(fis, null); 1475 int type; 1476 while ((type = parser.next()) != XmlPullParser.START_TAG 1477 && type != XmlPullParser.END_DOCUMENT) { 1478 ; 1479 } 1480 1481 if (type != XmlPullParser.START_TAG) { 1482 Slog.e(LOG_TAG, "Unable to read restrictions file " 1483 + restrictionsFile.getBaseFile()); 1484 return restrictions; 1485 } 1486 1487 while ((type = parser.next()) != XmlPullParser.END_DOCUMENT) { 1488 if (type == XmlPullParser.START_TAG && parser.getName().equals(TAG_ENTRY)) { 1489 String key = parser.getAttributeValue(null, ATTR_KEY); 1490 String valType = parser.getAttributeValue(null, ATTR_VALUE_TYPE); 1491 String multiple = parser.getAttributeValue(null, ATTR_MULTIPLE); 1492 if (multiple != null) { 1493 int count = Integer.parseInt(multiple); 1494 while (count > 0 && (type = parser.next()) != XmlPullParser.END_DOCUMENT) { 1495 if (type == XmlPullParser.START_TAG 1496 && parser.getName().equals(TAG_VALUE)) { 1497 values.add(parser.nextText().trim()); 1498 count--; 1499 } 1500 } 1501 String [] valueStrings = new String[values.size()]; 1502 values.toArray(valueStrings); 1503 restrictions.putStringArray(key, valueStrings); 1504 } else { 1505 String value = parser.nextText().trim(); 1506 if (ATTR_TYPE_BOOLEAN.equals(valType)) { 1507 restrictions.putBoolean(key, Boolean.parseBoolean(value)); 1508 } else if (ATTR_TYPE_INTEGER.equals(valType)) { 1509 restrictions.putInt(key, Integer.parseInt(value)); 1510 } else { 1511 restrictions.putString(key, value); 1512 } 1513 } 1514 } 1515 } 1516 } catch (IOException ioe) { 1517 } catch (XmlPullParserException pe) { 1518 } finally { 1519 if (fis != null) { 1520 try { 1521 fis.close(); 1522 } catch (IOException e) { 1523 } 1524 } 1525 } 1526 return restrictions; 1527 } 1528 1529 private void writeApplicationRestrictionsLocked(String packageName, 1530 Bundle restrictions, int userId) { 1531 FileOutputStream fos = null; 1532 AtomicFile restrictionsFile = new AtomicFile( 1533 new File(Environment.getUserSystemDirectory(userId), 1534 packageToRestrictionsFileName(packageName))); 1535 try { 1536 fos = restrictionsFile.startWrite(); 1537 final BufferedOutputStream bos = new BufferedOutputStream(fos); 1538 1539 // XmlSerializer serializer = XmlUtils.serializerInstance(); 1540 final XmlSerializer serializer = new FastXmlSerializer(); 1541 serializer.setOutput(bos, "utf-8"); 1542 serializer.startDocument(null, true); 1543 serializer.setFeature("http://xmlpull.org/v1/doc/features.html#indent-output", true); 1544 1545 serializer.startTag(null, TAG_RESTRICTIONS); 1546 1547 for (String key : restrictions.keySet()) { 1548 Object value = restrictions.get(key); 1549 serializer.startTag(null, TAG_ENTRY); 1550 serializer.attribute(null, ATTR_KEY, key); 1551 1552 if (value instanceof Boolean) { 1553 serializer.attribute(null, ATTR_VALUE_TYPE, ATTR_TYPE_BOOLEAN); 1554 serializer.text(value.toString()); 1555 } else if (value instanceof Integer) { 1556 serializer.attribute(null, ATTR_VALUE_TYPE, ATTR_TYPE_INTEGER); 1557 serializer.text(value.toString()); 1558 } else if (value == null || value instanceof String) { 1559 serializer.attribute(null, ATTR_VALUE_TYPE, ATTR_TYPE_STRING); 1560 serializer.text(value != null ? (String) value : ""); 1561 } else { 1562 serializer.attribute(null, ATTR_VALUE_TYPE, ATTR_TYPE_STRING_ARRAY); 1563 String[] values = (String[]) value; 1564 serializer.attribute(null, ATTR_MULTIPLE, Integer.toString(values.length)); 1565 for (String choice : values) { 1566 serializer.startTag(null, TAG_VALUE); 1567 serializer.text(choice != null ? choice : ""); 1568 serializer.endTag(null, TAG_VALUE); 1569 } 1570 } 1571 serializer.endTag(null, TAG_ENTRY); 1572 } 1573 1574 serializer.endTag(null, TAG_RESTRICTIONS); 1575 1576 serializer.endDocument(); 1577 restrictionsFile.finishWrite(fos); 1578 } catch (Exception e) { 1579 restrictionsFile.failWrite(fos); 1580 Slog.e(LOG_TAG, "Error writing application restrictions list"); 1581 } 1582 } 1583 1584 @Override 1585 public int getUserSerialNumber(int userHandle) { 1586 synchronized (mPackagesLock) { 1587 if (!exists(userHandle)) return -1; 1588 return getUserInfoLocked(userHandle).serialNumber; 1589 } 1590 } 1591 1592 @Override 1593 public int getUserHandle(int userSerialNumber) { 1594 synchronized (mPackagesLock) { 1595 for (int userId : mUserIds) { 1596 if (getUserInfoLocked(userId).serialNumber == userSerialNumber) return userId; 1597 } 1598 // Not found 1599 return -1; 1600 } 1601 } 1602 1603 /** 1604 * Caches the list of user ids in an array, adjusting the array size when necessary. 1605 */ 1606 private void updateUserIdsLocked() { 1607 int num = 0; 1608 for (int i = 0; i < mUsers.size(); i++) { 1609 if (!mUsers.valueAt(i).partial) { 1610 num++; 1611 } 1612 } 1613 final int[] newUsers = new int[num]; 1614 int n = 0; 1615 for (int i = 0; i < mUsers.size(); i++) { 1616 if (!mUsers.valueAt(i).partial) { 1617 newUsers[n++] = mUsers.keyAt(i); 1618 } 1619 } 1620 mUserIds = newUsers; 1621 } 1622 1623 /** 1624 * Make a note of the last started time of a user and do some cleanup. 1625 * @param userId the user that was just foregrounded 1626 */ 1627 public void userForeground(int userId) { 1628 synchronized (mPackagesLock) { 1629 UserInfo user = mUsers.get(userId); 1630 long now = System.currentTimeMillis(); 1631 if (user == null || user.partial) { 1632 Slog.w(LOG_TAG, "userForeground: unknown user #" + userId); 1633 return; 1634 } 1635 if (now > EPOCH_PLUS_30_YEARS) { 1636 user.lastLoggedInTime = now; 1637 writeUserLocked(user); 1638 } 1639 // If this is not a restricted profile and there is no restrictions pin, clean up 1640 // all restrictions files that might have been left behind, else clean up just the 1641 // ones with uninstalled packages 1642 RestrictionsPinState pinState = mRestrictionsPinStates.get(userId); 1643 final long salt = pinState == null ? 0 : pinState.salt; 1644 cleanAppRestrictions(userId, (!user.isRestricted() && salt == 0)); 1645 } 1646 } 1647 1648 /** 1649 * Returns the next available user id, filling in any holes in the ids. 1650 * TODO: May not be a good idea to recycle ids, in case it results in confusion 1651 * for data and battery stats collection, or unexpected cross-talk. 1652 * @return 1653 */ 1654 private int getNextAvailableIdLocked() { 1655 synchronized (mPackagesLock) { 1656 int i = MIN_USER_ID; 1657 while (i < Integer.MAX_VALUE) { 1658 if (mUsers.indexOfKey(i) < 0 && !mRemovingUserIds.get(i)) { 1659 break; 1660 } 1661 i++; 1662 } 1663 return i; 1664 } 1665 } 1666 1667 private String packageToRestrictionsFileName(String packageName) { 1668 return RESTRICTIONS_FILE_PREFIX + packageName + XML_SUFFIX; 1669 } 1670 1671 private String restrictionsFileNameToPackage(String fileName) { 1672 return fileName.substring(RESTRICTIONS_FILE_PREFIX.length(), 1673 (int) (fileName.length() - XML_SUFFIX.length())); 1674 } 1675 1676 @Override 1677 protected void dump(FileDescriptor fd, PrintWriter pw, String[] args) { 1678 if (mContext.checkCallingOrSelfPermission(android.Manifest.permission.DUMP) 1679 != PackageManager.PERMISSION_GRANTED) { 1680 pw.println("Permission Denial: can't dump UserManager from from pid=" 1681 + Binder.getCallingPid() 1682 + ", uid=" + Binder.getCallingUid() 1683 + " without permission " 1684 + android.Manifest.permission.DUMP); 1685 return; 1686 } 1687 1688 long now = System.currentTimeMillis(); 1689 StringBuilder sb = new StringBuilder(); 1690 synchronized (mPackagesLock) { 1691 pw.println("Users:"); 1692 for (int i = 0; i < mUsers.size(); i++) { 1693 UserInfo user = mUsers.valueAt(i); 1694 if (user == null) continue; 1695 pw.print(" "); pw.print(user); pw.print(" serialNo="); pw.print(user.serialNumber); 1696 if (mRemovingUserIds.get(mUsers.keyAt(i))) pw.print(" <removing> "); 1697 if (user.partial) pw.print(" <partial>"); 1698 pw.println(); 1699 pw.print(" Created: "); 1700 if (user.creationTime == 0) { 1701 pw.println("<unknown>"); 1702 } else { 1703 sb.setLength(0); 1704 TimeUtils.formatDuration(now - user.creationTime, sb); 1705 sb.append(" ago"); 1706 pw.println(sb); 1707 } 1708 pw.print(" Last logged in: "); 1709 if (user.lastLoggedInTime == 0) { 1710 pw.println("<unknown>"); 1711 } else { 1712 sb.setLength(0); 1713 TimeUtils.formatDuration(now - user.lastLoggedInTime, sb); 1714 sb.append(" ago"); 1715 pw.println(sb); 1716 } 1717 } 1718 } 1719 } 1720 1721 private PackageMonitor mUserPackageMonitor = new PackageMonitor() { 1722 @Override 1723 public void onPackageRemoved(String pkg, int uid) { 1724 final int userId = this.getChangingUserId(); 1725 // Package could be disappearing because it is being blocked, so also check if 1726 // it has been uninstalled. 1727 final boolean uninstalled = isPackageDisappearing(pkg) == PACKAGE_PERMANENT_CHANGE; 1728 if (uninstalled && userId >= 0 && !isPackageInstalled(pkg, userId)) { 1729 cleanAppRestrictionsForPackage(pkg, userId); 1730 } 1731 } 1732 }; 1733} 1734