UserManagerService.java revision 4f58263d02f296430a9653126d28501e95c7bb6c
1/* 2 * Copyright (C) 2011 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17package com.android.server.pm; 18 19import static android.text.format.DateUtils.MINUTE_IN_MILLIS; 20 21import android.app.Activity; 22import android.app.ActivityManager; 23import android.app.ActivityManagerNative; 24import android.app.ActivityThread; 25import android.app.IStopUserCallback; 26import android.content.BroadcastReceiver; 27import android.content.Context; 28import android.content.Intent; 29import android.content.pm.ApplicationInfo; 30import android.content.pm.PackageManager; 31import android.content.pm.PackageManager.NameNotFoundException; 32import android.content.pm.UserInfo; 33import android.graphics.Bitmap; 34import android.graphics.BitmapFactory; 35import android.os.Binder; 36import android.os.Bundle; 37import android.os.Environment; 38import android.os.FileUtils; 39import android.os.Handler; 40import android.os.IUserManager; 41import android.os.Process; 42import android.os.RemoteException; 43import android.os.UserHandle; 44import android.os.UserManager; 45import android.util.AtomicFile; 46import android.util.Log; 47import android.util.Slog; 48import android.util.SparseArray; 49import android.util.SparseBooleanArray; 50import android.util.TimeUtils; 51import android.util.Xml; 52 53import com.android.internal.content.PackageMonitor; 54import com.android.internal.util.ArrayUtils; 55import com.android.internal.util.FastXmlSerializer; 56 57import org.xmlpull.v1.XmlPullParser; 58import org.xmlpull.v1.XmlPullParserException; 59import org.xmlpull.v1.XmlSerializer; 60 61import java.io.BufferedOutputStream; 62import java.io.File; 63import java.io.FileDescriptor; 64import java.io.FileInputStream; 65import java.io.FileNotFoundException; 66import java.io.FileOutputStream; 67import java.io.IOException; 68import java.io.PrintWriter; 69import java.security.MessageDigest; 70import java.security.NoSuchAlgorithmException; 71import java.security.SecureRandom; 72import java.util.ArrayList; 73import java.util.List; 74 75public class UserManagerService extends IUserManager.Stub { 76 77 private static final String LOG_TAG = "UserManagerService"; 78 79 private static final boolean DBG = false; 80 81 private static final String TAG_NAME = "name"; 82 private static final String ATTR_FLAGS = "flags"; 83 private static final String ATTR_ICON_PATH = "icon"; 84 private static final String ATTR_ID = "id"; 85 private static final String ATTR_CREATION_TIME = "created"; 86 private static final String ATTR_LAST_LOGGED_IN_TIME = "lastLoggedIn"; 87 private static final String ATTR_SALT = "salt"; 88 private static final String ATTR_PIN_HASH = "pinHash"; 89 private static final String ATTR_FAILED_ATTEMPTS = "failedAttempts"; 90 private static final String ATTR_LAST_RETRY_MS = "lastAttemptMs"; 91 private static final String ATTR_SERIAL_NO = "serialNumber"; 92 private static final String ATTR_NEXT_SERIAL_NO = "nextSerialNumber"; 93 private static final String ATTR_PARTIAL = "partial"; 94 private static final String ATTR_USER_VERSION = "version"; 95 private static final String ATTR_PROFILE_GROUP_ID = "profileGroupId"; 96 private static final String TAG_USERS = "users"; 97 private static final String TAG_USER = "user"; 98 private static final String TAG_RESTRICTIONS = "restrictions"; 99 private static final String TAG_ENTRY = "entry"; 100 private static final String TAG_VALUE = "value"; 101 private static final String ATTR_KEY = "key"; 102 private static final String ATTR_VALUE_TYPE = "type"; 103 private static final String ATTR_MULTIPLE = "m"; 104 105 private static final String ATTR_TYPE_STRING_ARRAY = "sa"; 106 private static final String ATTR_TYPE_STRING = "s"; 107 private static final String ATTR_TYPE_BOOLEAN = "b"; 108 109 private static final String USER_INFO_DIR = "system" + File.separator + "users"; 110 private static final String USER_LIST_FILENAME = "userlist.xml"; 111 private static final String USER_PHOTO_FILENAME = "photo.png"; 112 113 private static final String RESTRICTIONS_FILE_PREFIX = "res_"; 114 private static final String XML_SUFFIX = ".xml"; 115 116 private static final int MIN_USER_ID = 10; 117 118 private static final int USER_VERSION = 4; 119 120 private static final long EPOCH_PLUS_30_YEARS = 30L * 365 * 24 * 60 * 60 * 1000L; // ms 121 122 // Number of attempts before jumping to the next BACKOFF_TIMES slot 123 private static final int BACKOFF_INC_INTERVAL = 5; 124 125 // Amount of time to force the user to wait before entering the PIN again, after failing 126 // BACKOFF_INC_INTERVAL times. 127 private static final int[] BACKOFF_TIMES = { 0, 30*1000, 60*1000, 5*60*1000, 30*60*1000 }; 128 129 private final Context mContext; 130 private final PackageManagerService mPm; 131 private final Object mInstallLock; 132 private final Object mPackagesLock; 133 134 private final Handler mHandler; 135 136 private final File mUsersDir; 137 private final File mUserListFile; 138 private final File mBaseUserPath; 139 140 private final SparseArray<UserInfo> mUsers = new SparseArray<UserInfo>(); 141 private final SparseArray<Bundle> mUserRestrictions = new SparseArray<Bundle>(); 142 143 class RestrictionsPinState { 144 long salt; 145 String pinHash; 146 int failedAttempts; 147 long lastAttemptTime; 148 } 149 150 private final SparseArray<RestrictionsPinState> mRestrictionsPinStates = 151 new SparseArray<RestrictionsPinState>(); 152 153 /** 154 * Set of user IDs being actively removed. Removed IDs linger in this set 155 * for several seconds to work around a VFS caching issue. 156 */ 157 // @GuardedBy("mPackagesLock") 158 private final SparseBooleanArray mRemovingUserIds = new SparseBooleanArray(); 159 160 private int[] mUserIds; 161 private boolean mGuestEnabled; 162 private int mNextSerialNumber; 163 private int mUserVersion = 0; 164 165 private static UserManagerService sInstance; 166 167 public static UserManagerService getInstance() { 168 synchronized (UserManagerService.class) { 169 return sInstance; 170 } 171 } 172 173 /** 174 * Available for testing purposes. 175 */ 176 UserManagerService(File dataDir, File baseUserPath) { 177 this(null, null, new Object(), new Object(), dataDir, baseUserPath); 178 } 179 180 /** 181 * Called by package manager to create the service. This is closely 182 * associated with the package manager, and the given lock is the 183 * package manager's own lock. 184 */ 185 UserManagerService(Context context, PackageManagerService pm, 186 Object installLock, Object packagesLock) { 187 this(context, pm, installLock, packagesLock, 188 Environment.getDataDirectory(), 189 new File(Environment.getDataDirectory(), "user")); 190 } 191 192 /** 193 * Available for testing purposes. 194 */ 195 private UserManagerService(Context context, PackageManagerService pm, 196 Object installLock, Object packagesLock, 197 File dataDir, File baseUserPath) { 198 mContext = context; 199 mPm = pm; 200 mInstallLock = installLock; 201 mPackagesLock = packagesLock; 202 mHandler = new Handler(); 203 synchronized (mInstallLock) { 204 synchronized (mPackagesLock) { 205 mUsersDir = new File(dataDir, USER_INFO_DIR); 206 mUsersDir.mkdirs(); 207 // Make zeroth user directory, for services to migrate their files to that location 208 File userZeroDir = new File(mUsersDir, "0"); 209 userZeroDir.mkdirs(); 210 mBaseUserPath = baseUserPath; 211 FileUtils.setPermissions(mUsersDir.toString(), 212 FileUtils.S_IRWXU|FileUtils.S_IRWXG 213 |FileUtils.S_IROTH|FileUtils.S_IXOTH, 214 -1, -1); 215 mUserListFile = new File(mUsersDir, USER_LIST_FILENAME); 216 readUserListLocked(); 217 // Prune out any partially created/partially removed users. 218 ArrayList<UserInfo> partials = new ArrayList<UserInfo>(); 219 for (int i = 0; i < mUsers.size(); i++) { 220 UserInfo ui = mUsers.valueAt(i); 221 if (ui.partial && i != 0) { 222 partials.add(ui); 223 } 224 } 225 for (int i = 0; i < partials.size(); i++) { 226 UserInfo ui = partials.get(i); 227 Slog.w(LOG_TAG, "Removing partially created user #" + i 228 + " (name=" + ui.name + ")"); 229 removeUserStateLocked(ui.id); 230 } 231 sInstance = this; 232 } 233 } 234 } 235 236 void systemReady() { 237 mUserPackageMonitor.register(mContext, null, UserHandle.ALL, false); 238 userForeground(UserHandle.USER_OWNER); 239 } 240 241 @Override 242 public List<UserInfo> getUsers(boolean excludeDying) { 243 checkManageUsersPermission("query users"); 244 synchronized (mPackagesLock) { 245 ArrayList<UserInfo> users = new ArrayList<UserInfo>(mUsers.size()); 246 for (int i = 0; i < mUsers.size(); i++) { 247 UserInfo ui = mUsers.valueAt(i); 248 if (ui.partial) { 249 continue; 250 } 251 if (!excludeDying || !mRemovingUserIds.get(ui.id)) { 252 users.add(ui); 253 } 254 } 255 return users; 256 } 257 } 258 259 @Override 260 public List<UserInfo> getProfiles(int userId) { 261 if (userId != UserHandle.getCallingUserId()) { 262 checkManageUsersPermission("getting profiles related to user " + userId); 263 } 264 synchronized (mPackagesLock) { 265 UserInfo user = getUserInfoLocked(userId); 266 ArrayList<UserInfo> users = new ArrayList<UserInfo>(mUsers.size()); 267 for (int i = 0; i < mUsers.size(); i++) { 268 UserInfo profile = mUsers.valueAt(i); 269 if (!isProfileOf(user, profile)) { 270 continue; 271 } 272 users.add(profile); 273 } 274 return users; 275 } 276 } 277 278 private boolean isProfileOf(UserInfo user, UserInfo profile) { 279 return user.id == profile.id || 280 (user.profileGroupId != UserInfo.NO_PROFILE_GROUP_ID 281 && user.profileGroupId == profile.profileGroupId); 282 } 283 284 @Override 285 public UserInfo getUserInfo(int userId) { 286 checkManageUsersPermission("query user"); 287 synchronized (mPackagesLock) { 288 return getUserInfoLocked(userId); 289 } 290 } 291 292 @Override 293 public boolean isRestricted() { 294 synchronized (mPackagesLock) { 295 return getUserInfoLocked(UserHandle.getCallingUserId()).isRestricted(); 296 } 297 } 298 299 /* 300 * Should be locked on mUsers before calling this. 301 */ 302 private UserInfo getUserInfoLocked(int userId) { 303 UserInfo ui = mUsers.get(userId); 304 // If it is partial and not in the process of being removed, return as unknown user. 305 if (ui != null && ui.partial && !mRemovingUserIds.get(userId)) { 306 Slog.w(LOG_TAG, "getUserInfo: unknown user #" + userId); 307 return null; 308 } 309 return ui; 310 } 311 312 public boolean exists(int userId) { 313 synchronized (mPackagesLock) { 314 return ArrayUtils.contains(mUserIds, userId); 315 } 316 } 317 318 @Override 319 public void setUserName(int userId, String name) { 320 checkManageUsersPermission("rename users"); 321 boolean changed = false; 322 synchronized (mPackagesLock) { 323 UserInfo info = mUsers.get(userId); 324 if (info == null || info.partial) { 325 Slog.w(LOG_TAG, "setUserName: unknown user #" + userId); 326 return; 327 } 328 if (name != null && !name.equals(info.name)) { 329 info.name = name; 330 writeUserLocked(info); 331 changed = true; 332 } 333 } 334 if (changed) { 335 sendUserInfoChangedBroadcast(userId); 336 } 337 } 338 339 @Override 340 public void setUserIcon(int userId, Bitmap bitmap) { 341 checkManageUsersPermission("update users"); 342 synchronized (mPackagesLock) { 343 UserInfo info = mUsers.get(userId); 344 if (info == null || info.partial) { 345 Slog.w(LOG_TAG, "setUserIcon: unknown user #" + userId); 346 return; 347 } 348 writeBitmapLocked(info, bitmap); 349 writeUserLocked(info); 350 } 351 sendUserInfoChangedBroadcast(userId); 352 } 353 354 private void sendUserInfoChangedBroadcast(int userId) { 355 Intent changedIntent = new Intent(Intent.ACTION_USER_INFO_CHANGED); 356 changedIntent.putExtra(Intent.EXTRA_USER_HANDLE, userId); 357 changedIntent.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY); 358 mContext.sendBroadcastAsUser(changedIntent, UserHandle.ALL); 359 } 360 361 @Override 362 public Bitmap getUserIcon(int userId) { 363 checkManageUsersPermission("read users"); 364 synchronized (mPackagesLock) { 365 UserInfo info = mUsers.get(userId); 366 if (info == null || info.partial) { 367 Slog.w(LOG_TAG, "getUserIcon: unknown user #" + userId); 368 return null; 369 } 370 if (info.iconPath == null) { 371 return null; 372 } 373 return BitmapFactory.decodeFile(info.iconPath); 374 } 375 } 376 377 @Override 378 public void setGuestEnabled(boolean enable) { 379 checkManageUsersPermission("enable guest users"); 380 synchronized (mPackagesLock) { 381 if (mGuestEnabled != enable) { 382 mGuestEnabled = enable; 383 // Erase any guest user that currently exists 384 for (int i = 0; i < mUsers.size(); i++) { 385 UserInfo user = mUsers.valueAt(i); 386 if (!user.partial && user.isGuest()) { 387 if (!enable) { 388 removeUser(user.id); 389 } 390 return; 391 } 392 } 393 // No guest was found 394 if (enable) { 395 createUser("Guest", UserInfo.FLAG_GUEST); 396 } 397 } 398 } 399 } 400 401 @Override 402 public boolean isGuestEnabled() { 403 synchronized (mPackagesLock) { 404 return mGuestEnabled; 405 } 406 } 407 408 @Override 409 public void wipeUser(int userHandle) { 410 checkManageUsersPermission("wipe user"); 411 // TODO: 412 } 413 414 public void makeInitialized(int userId) { 415 checkManageUsersPermission("makeInitialized"); 416 synchronized (mPackagesLock) { 417 UserInfo info = mUsers.get(userId); 418 if (info == null || info.partial) { 419 Slog.w(LOG_TAG, "makeInitialized: unknown user #" + userId); 420 } 421 if ((info.flags&UserInfo.FLAG_INITIALIZED) == 0) { 422 info.flags |= UserInfo.FLAG_INITIALIZED; 423 writeUserLocked(info); 424 } 425 } 426 } 427 428 @Override 429 public Bundle getUserRestrictions(int userId) { 430 // checkManageUsersPermission("getUserRestrictions"); 431 432 synchronized (mPackagesLock) { 433 Bundle restrictions = mUserRestrictions.get(userId); 434 return restrictions != null ? restrictions : Bundle.EMPTY; 435 } 436 } 437 438 @Override 439 public void setUserRestrictions(Bundle restrictions, int userId) { 440 checkManageUsersPermission("setUserRestrictions"); 441 if (restrictions == null) return; 442 443 synchronized (mPackagesLock) { 444 mUserRestrictions.get(userId).clear(); 445 mUserRestrictions.get(userId).putAll(restrictions); 446 writeUserLocked(mUsers.get(userId)); 447 } 448 } 449 450 /** 451 * Check if we've hit the limit of how many users can be created. 452 */ 453 private boolean isUserLimitReachedLocked() { 454 int nUsers = mUsers.size(); 455 return nUsers >= UserManager.getMaxSupportedUsers(); 456 } 457 458 /** 459 * Enforces that only the system UID or root's UID or apps that have the 460 * {@link android.Manifest.permission#MANAGE_USERS MANAGE_USERS} 461 * permission can make certain calls to the UserManager. 462 * 463 * @param message used as message if SecurityException is thrown 464 * @throws SecurityException if the caller is not system or root 465 */ 466 private static final void checkManageUsersPermission(String message) { 467 final int uid = Binder.getCallingUid(); 468 if (uid != Process.SYSTEM_UID && uid != 0 469 && ActivityManager.checkComponentPermission( 470 android.Manifest.permission.MANAGE_USERS, 471 uid, -1, true) != PackageManager.PERMISSION_GRANTED) { 472 throw new SecurityException("You need MANAGE_USERS permission to: " + message); 473 } 474 } 475 476 private void writeBitmapLocked(UserInfo info, Bitmap bitmap) { 477 try { 478 File dir = new File(mUsersDir, Integer.toString(info.id)); 479 File file = new File(dir, USER_PHOTO_FILENAME); 480 if (!dir.exists()) { 481 dir.mkdir(); 482 FileUtils.setPermissions( 483 dir.getPath(), 484 FileUtils.S_IRWXU|FileUtils.S_IRWXG|FileUtils.S_IXOTH, 485 -1, -1); 486 } 487 FileOutputStream os; 488 if (bitmap.compress(Bitmap.CompressFormat.PNG, 100, os = new FileOutputStream(file))) { 489 info.iconPath = file.getAbsolutePath(); 490 } 491 try { 492 os.close(); 493 } catch (IOException ioe) { 494 // What the ... ! 495 } 496 } catch (FileNotFoundException e) { 497 Slog.w(LOG_TAG, "Error setting photo for user ", e); 498 } 499 } 500 501 /** 502 * Returns an array of user ids. This array is cached here for quick access, so do not modify or 503 * cache it elsewhere. 504 * @return the array of user ids. 505 */ 506 public int[] getUserIds() { 507 synchronized (mPackagesLock) { 508 return mUserIds; 509 } 510 } 511 512 int[] getUserIdsLPr() { 513 return mUserIds; 514 } 515 516 private void readUserListLocked() { 517 mGuestEnabled = false; 518 if (!mUserListFile.exists()) { 519 fallbackToSingleUserLocked(); 520 return; 521 } 522 FileInputStream fis = null; 523 AtomicFile userListFile = new AtomicFile(mUserListFile); 524 try { 525 fis = userListFile.openRead(); 526 XmlPullParser parser = Xml.newPullParser(); 527 parser.setInput(fis, null); 528 int type; 529 while ((type = parser.next()) != XmlPullParser.START_TAG 530 && type != XmlPullParser.END_DOCUMENT) { 531 ; 532 } 533 534 if (type != XmlPullParser.START_TAG) { 535 Slog.e(LOG_TAG, "Unable to read user list"); 536 fallbackToSingleUserLocked(); 537 return; 538 } 539 540 mNextSerialNumber = -1; 541 if (parser.getName().equals(TAG_USERS)) { 542 String lastSerialNumber = parser.getAttributeValue(null, ATTR_NEXT_SERIAL_NO); 543 if (lastSerialNumber != null) { 544 mNextSerialNumber = Integer.parseInt(lastSerialNumber); 545 } 546 String versionNumber = parser.getAttributeValue(null, ATTR_USER_VERSION); 547 if (versionNumber != null) { 548 mUserVersion = Integer.parseInt(versionNumber); 549 } 550 } 551 552 while ((type = parser.next()) != XmlPullParser.END_DOCUMENT) { 553 if (type == XmlPullParser.START_TAG && parser.getName().equals(TAG_USER)) { 554 String id = parser.getAttributeValue(null, ATTR_ID); 555 UserInfo user = readUserLocked(Integer.parseInt(id)); 556 557 if (user != null) { 558 mUsers.put(user.id, user); 559 if (user.isGuest()) { 560 mGuestEnabled = true; 561 } 562 if (mNextSerialNumber < 0 || mNextSerialNumber <= user.id) { 563 mNextSerialNumber = user.id + 1; 564 } 565 } 566 } 567 } 568 updateUserIdsLocked(); 569 upgradeIfNecessaryLocked(); 570 } catch (IOException ioe) { 571 fallbackToSingleUserLocked(); 572 } catch (XmlPullParserException pe) { 573 fallbackToSingleUserLocked(); 574 } finally { 575 if (fis != null) { 576 try { 577 fis.close(); 578 } catch (IOException e) { 579 } 580 } 581 } 582 } 583 584 /** 585 * Upgrade steps between versions, either for fixing bugs or changing the data format. 586 */ 587 private void upgradeIfNecessaryLocked() { 588 int userVersion = mUserVersion; 589 if (userVersion < 1) { 590 // Assign a proper name for the owner, if not initialized correctly before 591 UserInfo user = mUsers.get(UserHandle.USER_OWNER); 592 if ("Primary".equals(user.name)) { 593 user.name = mContext.getResources().getString(com.android.internal.R.string.owner_name); 594 writeUserLocked(user); 595 } 596 userVersion = 1; 597 } 598 599 if (userVersion < 2) { 600 // Owner should be marked as initialized 601 UserInfo user = mUsers.get(UserHandle.USER_OWNER); 602 if ((user.flags & UserInfo.FLAG_INITIALIZED) == 0) { 603 user.flags |= UserInfo.FLAG_INITIALIZED; 604 writeUserLocked(user); 605 } 606 userVersion = 2; 607 } 608 609 610 if (userVersion < 4) { 611 userVersion = 4; 612 } 613 614 if (userVersion < USER_VERSION) { 615 Slog.w(LOG_TAG, "User version " + mUserVersion + " didn't upgrade as expected to " 616 + USER_VERSION); 617 } else { 618 mUserVersion = userVersion; 619 writeUserListLocked(); 620 } 621 } 622 623 private void fallbackToSingleUserLocked() { 624 // Create the primary user 625 UserInfo primary = new UserInfo(UserHandle.USER_OWNER, 626 mContext.getResources().getString(com.android.internal.R.string.owner_name), null, 627 UserInfo.FLAG_ADMIN | UserInfo.FLAG_PRIMARY | UserInfo.FLAG_INITIALIZED); 628 mUsers.put(0, primary); 629 mNextSerialNumber = MIN_USER_ID; 630 mUserVersion = USER_VERSION; 631 632 Bundle restrictions = new Bundle(); 633 mUserRestrictions.append(UserHandle.USER_OWNER, restrictions); 634 635 updateUserIdsLocked(); 636 637 writeUserListLocked(); 638 writeUserLocked(primary); 639 } 640 641 /* 642 * Writes the user file in this format: 643 * 644 * <user flags="20039023" id="0"> 645 * <name>Primary</name> 646 * </user> 647 */ 648 private void writeUserLocked(UserInfo userInfo) { 649 FileOutputStream fos = null; 650 AtomicFile userFile = new AtomicFile(new File(mUsersDir, userInfo.id + XML_SUFFIX)); 651 try { 652 fos = userFile.startWrite(); 653 final BufferedOutputStream bos = new BufferedOutputStream(fos); 654 655 // XmlSerializer serializer = XmlUtils.serializerInstance(); 656 final XmlSerializer serializer = new FastXmlSerializer(); 657 serializer.setOutput(bos, "utf-8"); 658 serializer.startDocument(null, true); 659 serializer.setFeature("http://xmlpull.org/v1/doc/features.html#indent-output", true); 660 661 serializer.startTag(null, TAG_USER); 662 serializer.attribute(null, ATTR_ID, Integer.toString(userInfo.id)); 663 serializer.attribute(null, ATTR_SERIAL_NO, Integer.toString(userInfo.serialNumber)); 664 serializer.attribute(null, ATTR_FLAGS, Integer.toString(userInfo.flags)); 665 serializer.attribute(null, ATTR_CREATION_TIME, Long.toString(userInfo.creationTime)); 666 serializer.attribute(null, ATTR_LAST_LOGGED_IN_TIME, 667 Long.toString(userInfo.lastLoggedInTime)); 668 RestrictionsPinState pinState = mRestrictionsPinStates.get(userInfo.id); 669 if (pinState != null) { 670 if (pinState.salt != 0) { 671 serializer.attribute(null, ATTR_SALT, Long.toString(pinState.salt)); 672 } 673 if (pinState.pinHash != null) { 674 serializer.attribute(null, ATTR_PIN_HASH, pinState.pinHash); 675 } 676 if (pinState.failedAttempts != 0) { 677 serializer.attribute(null, ATTR_FAILED_ATTEMPTS, 678 Integer.toString(pinState.failedAttempts)); 679 serializer.attribute(null, ATTR_LAST_RETRY_MS, 680 Long.toString(pinState.lastAttemptTime)); 681 } 682 } 683 if (userInfo.iconPath != null) { 684 serializer.attribute(null, ATTR_ICON_PATH, userInfo.iconPath); 685 } 686 if (userInfo.partial) { 687 serializer.attribute(null, ATTR_PARTIAL, "true"); 688 } 689 if (userInfo.profileGroupId != UserInfo.NO_PROFILE_GROUP_ID) { 690 serializer.attribute(null, ATTR_PROFILE_GROUP_ID, 691 Integer.toString(userInfo.profileGroupId)); 692 } 693 694 serializer.startTag(null, TAG_NAME); 695 serializer.text(userInfo.name); 696 serializer.endTag(null, TAG_NAME); 697 698 Bundle restrictions = mUserRestrictions.get(userInfo.id); 699 if (restrictions != null) { 700 serializer.startTag(null, TAG_RESTRICTIONS); 701 writeBoolean(serializer, restrictions, UserManager.DISALLOW_CONFIG_WIFI); 702 writeBoolean(serializer, restrictions, UserManager.DISALLOW_MODIFY_ACCOUNTS); 703 writeBoolean(serializer, restrictions, UserManager.DISALLOW_INSTALL_APPS); 704 writeBoolean(serializer, restrictions, UserManager.DISALLOW_UNINSTALL_APPS); 705 writeBoolean(serializer, restrictions, UserManager.DISALLOW_SHARE_LOCATION); 706 writeBoolean(serializer, restrictions, 707 UserManager.DISALLOW_INSTALL_UNKNOWN_SOURCES); 708 writeBoolean(serializer, restrictions, UserManager.DISALLOW_CONFIG_BLUETOOTH); 709 writeBoolean(serializer, restrictions, UserManager.DISALLOW_USB_FILE_TRANSFER); 710 writeBoolean(serializer, restrictions, UserManager.DISALLOW_CONFIG_CREDENTIALS); 711 writeBoolean(serializer, restrictions, UserManager.DISALLOW_REMOVE_USER); 712 serializer.endTag(null, TAG_RESTRICTIONS); 713 } 714 serializer.endTag(null, TAG_USER); 715 716 serializer.endDocument(); 717 userFile.finishWrite(fos); 718 } catch (Exception ioe) { 719 Slog.e(LOG_TAG, "Error writing user info " + userInfo.id + "\n" + ioe); 720 userFile.failWrite(fos); 721 } 722 } 723 724 /* 725 * Writes the user list file in this format: 726 * 727 * <users nextSerialNumber="3"> 728 * <user id="0"></user> 729 * <user id="2"></user> 730 * </users> 731 */ 732 private void writeUserListLocked() { 733 FileOutputStream fos = null; 734 AtomicFile userListFile = new AtomicFile(mUserListFile); 735 try { 736 fos = userListFile.startWrite(); 737 final BufferedOutputStream bos = new BufferedOutputStream(fos); 738 739 // XmlSerializer serializer = XmlUtils.serializerInstance(); 740 final XmlSerializer serializer = new FastXmlSerializer(); 741 serializer.setOutput(bos, "utf-8"); 742 serializer.startDocument(null, true); 743 serializer.setFeature("http://xmlpull.org/v1/doc/features.html#indent-output", true); 744 745 serializer.startTag(null, TAG_USERS); 746 serializer.attribute(null, ATTR_NEXT_SERIAL_NO, Integer.toString(mNextSerialNumber)); 747 serializer.attribute(null, ATTR_USER_VERSION, Integer.toString(mUserVersion)); 748 749 for (int i = 0; i < mUsers.size(); i++) { 750 UserInfo user = mUsers.valueAt(i); 751 serializer.startTag(null, TAG_USER); 752 serializer.attribute(null, ATTR_ID, Integer.toString(user.id)); 753 serializer.endTag(null, TAG_USER); 754 } 755 756 serializer.endTag(null, TAG_USERS); 757 758 serializer.endDocument(); 759 userListFile.finishWrite(fos); 760 } catch (Exception e) { 761 userListFile.failWrite(fos); 762 Slog.e(LOG_TAG, "Error writing user list"); 763 } 764 } 765 766 private UserInfo readUserLocked(int id) { 767 int flags = 0; 768 int serialNumber = id; 769 String name = null; 770 String iconPath = null; 771 long creationTime = 0L; 772 long lastLoggedInTime = 0L; 773 long salt = 0L; 774 String pinHash = null; 775 int failedAttempts = 0; 776 int profileGroupId = UserInfo.NO_PROFILE_GROUP_ID; 777 long lastAttemptTime = 0L; 778 boolean partial = false; 779 Bundle restrictions = new Bundle(); 780 781 FileInputStream fis = null; 782 try { 783 AtomicFile userFile = 784 new AtomicFile(new File(mUsersDir, Integer.toString(id) + XML_SUFFIX)); 785 fis = userFile.openRead(); 786 XmlPullParser parser = Xml.newPullParser(); 787 parser.setInput(fis, null); 788 int type; 789 while ((type = parser.next()) != XmlPullParser.START_TAG 790 && type != XmlPullParser.END_DOCUMENT) { 791 ; 792 } 793 794 if (type != XmlPullParser.START_TAG) { 795 Slog.e(LOG_TAG, "Unable to read user " + id); 796 return null; 797 } 798 799 if (type == XmlPullParser.START_TAG && parser.getName().equals(TAG_USER)) { 800 int storedId = readIntAttribute(parser, ATTR_ID, -1); 801 if (storedId != id) { 802 Slog.e(LOG_TAG, "User id does not match the file name"); 803 return null; 804 } 805 serialNumber = readIntAttribute(parser, ATTR_SERIAL_NO, id); 806 flags = readIntAttribute(parser, ATTR_FLAGS, 0); 807 iconPath = parser.getAttributeValue(null, ATTR_ICON_PATH); 808 creationTime = readLongAttribute(parser, ATTR_CREATION_TIME, 0); 809 lastLoggedInTime = readLongAttribute(parser, ATTR_LAST_LOGGED_IN_TIME, 0); 810 salt = readLongAttribute(parser, ATTR_SALT, 0L); 811 pinHash = parser.getAttributeValue(null, ATTR_PIN_HASH); 812 failedAttempts = readIntAttribute(parser, ATTR_FAILED_ATTEMPTS, 0); 813 lastAttemptTime = readLongAttribute(parser, ATTR_LAST_RETRY_MS, 0L); 814 profileGroupId = readIntAttribute(parser, ATTR_PROFILE_GROUP_ID, 815 UserInfo.NO_PROFILE_GROUP_ID); 816 if (profileGroupId == UserInfo.NO_PROFILE_GROUP_ID) { 817 // This attribute was added and renamed during development of L. 818 // TODO Remove upgrade path by 1st May 2014 819 profileGroupId = readIntAttribute(parser, "relatedGroupId", 820 UserInfo.NO_PROFILE_GROUP_ID); 821 } 822 String valueString = parser.getAttributeValue(null, ATTR_PARTIAL); 823 if ("true".equals(valueString)) { 824 partial = true; 825 } 826 827 int outerDepth = parser.getDepth(); 828 while ((type = parser.next()) != XmlPullParser.END_DOCUMENT 829 && (type != XmlPullParser.END_TAG || parser.getDepth() > outerDepth)) { 830 if (type == XmlPullParser.END_TAG || type == XmlPullParser.TEXT) { 831 continue; 832 } 833 String tag = parser.getName(); 834 if (TAG_NAME.equals(tag)) { 835 type = parser.next(); 836 if (type == XmlPullParser.TEXT) { 837 name = parser.getText(); 838 } 839 } else if (TAG_RESTRICTIONS.equals(tag)) { 840 readBoolean(parser, restrictions, UserManager.DISALLOW_CONFIG_WIFI); 841 readBoolean(parser, restrictions, UserManager.DISALLOW_MODIFY_ACCOUNTS); 842 readBoolean(parser, restrictions, UserManager.DISALLOW_INSTALL_APPS); 843 readBoolean(parser, restrictions, UserManager.DISALLOW_UNINSTALL_APPS); 844 readBoolean(parser, restrictions, UserManager.DISALLOW_SHARE_LOCATION); 845 readBoolean(parser, restrictions, 846 UserManager.DISALLOW_INSTALL_UNKNOWN_SOURCES); 847 readBoolean(parser, restrictions, UserManager.DISALLOW_CONFIG_BLUETOOTH); 848 readBoolean(parser, restrictions, UserManager.DISALLOW_USB_FILE_TRANSFER); 849 readBoolean(parser, restrictions, UserManager.DISALLOW_CONFIG_CREDENTIALS); 850 readBoolean(parser, restrictions, UserManager.DISALLOW_REMOVE_USER); 851 } 852 } 853 } 854 855 UserInfo userInfo = new UserInfo(id, name, iconPath, flags); 856 userInfo.serialNumber = serialNumber; 857 userInfo.creationTime = creationTime; 858 userInfo.lastLoggedInTime = lastLoggedInTime; 859 userInfo.partial = partial; 860 userInfo.profileGroupId = profileGroupId; 861 mUserRestrictions.append(id, restrictions); 862 if (salt != 0L) { 863 RestrictionsPinState pinState = mRestrictionsPinStates.get(id); 864 if (pinState == null) { 865 pinState = new RestrictionsPinState(); 866 mRestrictionsPinStates.put(id, pinState); 867 } 868 pinState.salt = salt; 869 pinState.pinHash = pinHash; 870 pinState.failedAttempts = failedAttempts; 871 pinState.lastAttemptTime = lastAttemptTime; 872 } 873 return userInfo; 874 875 } catch (IOException ioe) { 876 } catch (XmlPullParserException pe) { 877 } finally { 878 if (fis != null) { 879 try { 880 fis.close(); 881 } catch (IOException e) { 882 } 883 } 884 } 885 return null; 886 } 887 888 private void readBoolean(XmlPullParser parser, Bundle restrictions, 889 String restrictionKey) { 890 String value = parser.getAttributeValue(null, restrictionKey); 891 if (value != null) { 892 restrictions.putBoolean(restrictionKey, Boolean.parseBoolean(value)); 893 } 894 } 895 896 private void writeBoolean(XmlSerializer xml, Bundle restrictions, String restrictionKey) 897 throws IOException { 898 if (restrictions.containsKey(restrictionKey)) { 899 xml.attribute(null, restrictionKey, 900 Boolean.toString(restrictions.getBoolean(restrictionKey))); 901 } 902 } 903 904 private int readIntAttribute(XmlPullParser parser, String attr, int defaultValue) { 905 String valueString = parser.getAttributeValue(null, attr); 906 if (valueString == null) return defaultValue; 907 try { 908 return Integer.parseInt(valueString); 909 } catch (NumberFormatException nfe) { 910 return defaultValue; 911 } 912 } 913 914 private long readLongAttribute(XmlPullParser parser, String attr, long defaultValue) { 915 String valueString = parser.getAttributeValue(null, attr); 916 if (valueString == null) return defaultValue; 917 try { 918 return Long.parseLong(valueString); 919 } catch (NumberFormatException nfe) { 920 return defaultValue; 921 } 922 } 923 924 private boolean isPackageInstalled(String pkg, int userId) { 925 final ApplicationInfo info = mPm.getApplicationInfo(pkg, 926 PackageManager.GET_UNINSTALLED_PACKAGES, 927 userId); 928 if (info == null || (info.flags&ApplicationInfo.FLAG_INSTALLED) == 0) { 929 return false; 930 } 931 return true; 932 } 933 934 /** 935 * Removes all the restrictions files (res_<packagename>) for a given user, if all is true, 936 * else removes only those packages that have been uninstalled. 937 * Does not do any permissions checking. 938 */ 939 private void cleanAppRestrictions(int userId, boolean all) { 940 synchronized (mPackagesLock) { 941 File dir = Environment.getUserSystemDirectory(userId); 942 String[] files = dir.list(); 943 if (files == null) return; 944 for (String fileName : files) { 945 if (fileName.startsWith(RESTRICTIONS_FILE_PREFIX)) { 946 File resFile = new File(dir, fileName); 947 if (resFile.exists()) { 948 if (all) { 949 resFile.delete(); 950 } else { 951 String pkg = restrictionsFileNameToPackage(fileName); 952 if (!isPackageInstalled(pkg, userId)) { 953 resFile.delete(); 954 } 955 } 956 } 957 } 958 } 959 } 960 } 961 962 /** 963 * Removes the app restrictions file for a specific package and user id, if it exists. 964 */ 965 private void cleanAppRestrictionsForPackage(String pkg, int userId) { 966 synchronized (mPackagesLock) { 967 File dir = Environment.getUserSystemDirectory(userId); 968 File resFile = new File(dir, packageToRestrictionsFileName(pkg)); 969 if (resFile.exists()) { 970 resFile.delete(); 971 } 972 } 973 } 974 975 private int getNextProfileGroupIdLocked() { 976 int maxGroupId = UserInfo.NO_PROFILE_GROUP_ID; 977 for (int i = 0; i < mUsers.size(); i++) { 978 UserInfo ui = mUsers.valueAt(i); 979 if (maxGroupId < ui.profileGroupId) { 980 maxGroupId = ui.profileGroupId; 981 } 982 } 983 return maxGroupId + 1; 984 } 985 986 @Override 987 public UserInfo createProfileForUser(String name, int flags, int userId) { 988 checkManageUsersPermission("Only the system can create users"); 989 if (userId != UserHandle.USER_OWNER) { 990 Slog.w(LOG_TAG, "Only user owner can have profiles"); 991 return null; 992 } 993 return createUserInternal(name, flags, userId); 994 } 995 996 @Override 997 public UserInfo createUser(String name, int flags) { 998 checkManageUsersPermission("Only the system can create users"); 999 return createUserInternal(name, flags, UserHandle.USER_NULL); 1000 } 1001 1002 private UserInfo createUserInternal(String name, int flags, int profileId) { 1003 final long ident = Binder.clearCallingIdentity(); 1004 UserInfo userInfo = null; 1005 try { 1006 synchronized (mInstallLock) { 1007 synchronized (mPackagesLock) { 1008 UserInfo profile = null; 1009 if (profileId != UserHandle.USER_NULL) { 1010 profile = getUserInfoLocked(profileId); 1011 if (profile == null) return null; 1012 } 1013 if (isUserLimitReachedLocked()) return null; 1014 int userId = getNextAvailableIdLocked(); 1015 userInfo = new UserInfo(userId, name, null, flags); 1016 File userPath = new File(mBaseUserPath, Integer.toString(userId)); 1017 userInfo.serialNumber = mNextSerialNumber++; 1018 long now = System.currentTimeMillis(); 1019 userInfo.creationTime = (now > EPOCH_PLUS_30_YEARS) ? now : 0; 1020 userInfo.partial = true; 1021 Environment.getUserSystemDirectory(userInfo.id).mkdirs(); 1022 mUsers.put(userId, userInfo); 1023 writeUserListLocked(); 1024 if (profile != null) { 1025 if (profile.profileGroupId == UserInfo.NO_PROFILE_GROUP_ID) { 1026 profile.profileGroupId = getNextProfileGroupIdLocked(); 1027 writeUserLocked(profile); 1028 } 1029 userInfo.profileGroupId = profile.profileGroupId; 1030 } 1031 writeUserLocked(userInfo); 1032 mPm.createNewUserLILPw(userId, userPath); 1033 userInfo.partial = false; 1034 writeUserLocked(userInfo); 1035 updateUserIdsLocked(); 1036 Bundle restrictions = new Bundle(); 1037 mUserRestrictions.append(userId, restrictions); 1038 } 1039 } 1040 if (userInfo != null) { 1041 Intent addedIntent = new Intent(Intent.ACTION_USER_ADDED); 1042 addedIntent.putExtra(Intent.EXTRA_USER_HANDLE, userInfo.id); 1043 mContext.sendBroadcastAsUser(addedIntent, UserHandle.ALL, 1044 android.Manifest.permission.MANAGE_USERS); 1045 } 1046 } finally { 1047 Binder.restoreCallingIdentity(ident); 1048 } 1049 return userInfo; 1050 } 1051 1052 /** 1053 * Removes a user and all data directories created for that user. This method should be called 1054 * after the user's processes have been terminated. 1055 * @param userHandle the user's id 1056 */ 1057 public boolean removeUser(int userHandle) { 1058 checkManageUsersPermission("Only the system can remove users"); 1059 final UserInfo user; 1060 synchronized (mPackagesLock) { 1061 user = mUsers.get(userHandle); 1062 if (userHandle == 0 || user == null) { 1063 return false; 1064 } 1065 mRemovingUserIds.put(userHandle, true); 1066 // Set this to a partially created user, so that the user will be purged 1067 // on next startup, in case the runtime stops now before stopping and 1068 // removing the user completely. 1069 user.partial = true; 1070 writeUserLocked(user); 1071 } 1072 if (DBG) Slog.i(LOG_TAG, "Stopping user " + userHandle); 1073 int res; 1074 try { 1075 res = ActivityManagerNative.getDefault().stopUser(userHandle, 1076 new IStopUserCallback.Stub() { 1077 @Override 1078 public void userStopped(int userId) { 1079 finishRemoveUser(userId); 1080 } 1081 @Override 1082 public void userStopAborted(int userId) { 1083 } 1084 }); 1085 } catch (RemoteException e) { 1086 return false; 1087 } 1088 1089 return res == ActivityManager.USER_OP_SUCCESS; 1090 } 1091 1092 void finishRemoveUser(final int userHandle) { 1093 if (DBG) Slog.i(LOG_TAG, "finishRemoveUser " + userHandle); 1094 // Let other services shutdown any activity and clean up their state before completely 1095 // wiping the user's system directory and removing from the user list 1096 long ident = Binder.clearCallingIdentity(); 1097 try { 1098 Intent addedIntent = new Intent(Intent.ACTION_USER_REMOVED); 1099 addedIntent.putExtra(Intent.EXTRA_USER_HANDLE, userHandle); 1100 mContext.sendOrderedBroadcastAsUser(addedIntent, UserHandle.ALL, 1101 android.Manifest.permission.MANAGE_USERS, 1102 1103 new BroadcastReceiver() { 1104 @Override 1105 public void onReceive(Context context, Intent intent) { 1106 if (DBG) { 1107 Slog.i(LOG_TAG, 1108 "USER_REMOVED broadcast sent, cleaning up user data " 1109 + userHandle); 1110 } 1111 new Thread() { 1112 public void run() { 1113 synchronized (mInstallLock) { 1114 synchronized (mPackagesLock) { 1115 removeUserStateLocked(userHandle); 1116 } 1117 } 1118 } 1119 }.start(); 1120 } 1121 }, 1122 1123 null, Activity.RESULT_OK, null, null); 1124 } finally { 1125 Binder.restoreCallingIdentity(ident); 1126 } 1127 } 1128 1129 private void removeUserStateLocked(final int userHandle) { 1130 // Cleanup package manager settings 1131 mPm.cleanUpUserLILPw(userHandle); 1132 1133 // Remove this user from the list 1134 mUsers.remove(userHandle); 1135 1136 // Have user ID linger for several seconds to let external storage VFS 1137 // cache entries expire. This must be greater than the 'entry_valid' 1138 // timeout used by the FUSE daemon. 1139 mHandler.postDelayed(new Runnable() { 1140 @Override 1141 public void run() { 1142 synchronized (mPackagesLock) { 1143 mRemovingUserIds.delete(userHandle); 1144 } 1145 } 1146 }, MINUTE_IN_MILLIS); 1147 1148 mRestrictionsPinStates.remove(userHandle); 1149 // Remove user file 1150 AtomicFile userFile = new AtomicFile(new File(mUsersDir, userHandle + XML_SUFFIX)); 1151 userFile.delete(); 1152 // Update the user list 1153 writeUserListLocked(); 1154 updateUserIdsLocked(); 1155 removeDirectoryRecursive(Environment.getUserSystemDirectory(userHandle)); 1156 } 1157 1158 private void removeDirectoryRecursive(File parent) { 1159 if (parent.isDirectory()) { 1160 String[] files = parent.list(); 1161 for (String filename : files) { 1162 File child = new File(parent, filename); 1163 removeDirectoryRecursive(child); 1164 } 1165 } 1166 parent.delete(); 1167 } 1168 1169 @Override 1170 public Bundle getApplicationRestrictions(String packageName) { 1171 return getApplicationRestrictionsForUser(packageName, UserHandle.getCallingUserId()); 1172 } 1173 1174 @Override 1175 public Bundle getApplicationRestrictionsForUser(String packageName, int userId) { 1176 if (UserHandle.getCallingUserId() != userId 1177 || !UserHandle.isSameApp(Binder.getCallingUid(), getUidForPackage(packageName))) { 1178 checkManageUsersPermission("Only system can get restrictions for other users/apps"); 1179 } 1180 synchronized (mPackagesLock) { 1181 // Read the restrictions from XML 1182 return readApplicationRestrictionsLocked(packageName, userId); 1183 } 1184 } 1185 1186 @Override 1187 public void setApplicationRestrictions(String packageName, Bundle restrictions, 1188 int userId) { 1189 if (UserHandle.getCallingUserId() != userId 1190 || !UserHandle.isSameApp(Binder.getCallingUid(), getUidForPackage(packageName))) { 1191 checkManageUsersPermission("Only system can set restrictions for other users/apps"); 1192 } 1193 synchronized (mPackagesLock) { 1194 // Write the restrictions to XML 1195 writeApplicationRestrictionsLocked(packageName, restrictions, userId); 1196 } 1197 } 1198 1199 @Override 1200 public boolean setRestrictionsChallenge(String newPin) { 1201 checkManageUsersPermission("Only system can modify the restrictions pin"); 1202 int userId = UserHandle.getCallingUserId(); 1203 synchronized (mPackagesLock) { 1204 RestrictionsPinState pinState = mRestrictionsPinStates.get(userId); 1205 if (pinState == null) { 1206 pinState = new RestrictionsPinState(); 1207 } 1208 if (newPin == null) { 1209 pinState.salt = 0; 1210 pinState.pinHash = null; 1211 } else { 1212 try { 1213 pinState.salt = SecureRandom.getInstance("SHA1PRNG").nextLong(); 1214 } catch (NoSuchAlgorithmException e) { 1215 pinState.salt = (long) (Math.random() * Long.MAX_VALUE); 1216 } 1217 pinState.pinHash = passwordToHash(newPin, pinState.salt); 1218 pinState.failedAttempts = 0; 1219 } 1220 mRestrictionsPinStates.put(userId, pinState); 1221 writeUserLocked(mUsers.get(userId)); 1222 } 1223 return true; 1224 } 1225 1226 @Override 1227 public int checkRestrictionsChallenge(String pin) { 1228 checkManageUsersPermission("Only system can verify the restrictions pin"); 1229 int userId = UserHandle.getCallingUserId(); 1230 synchronized (mPackagesLock) { 1231 RestrictionsPinState pinState = mRestrictionsPinStates.get(userId); 1232 // If there's no pin set, return error code 1233 if (pinState == null || pinState.salt == 0 || pinState.pinHash == null) { 1234 return UserManager.PIN_VERIFICATION_FAILED_NOT_SET; 1235 } else if (pin == null) { 1236 // If just checking if user can be prompted, return remaining time 1237 int waitTime = getRemainingTimeForPinAttempt(pinState); 1238 Slog.d(LOG_TAG, "Remaining waittime peek=" + waitTime); 1239 return waitTime; 1240 } else { 1241 int waitTime = getRemainingTimeForPinAttempt(pinState); 1242 Slog.d(LOG_TAG, "Remaining waittime=" + waitTime); 1243 if (waitTime > 0) { 1244 return waitTime; 1245 } 1246 if (passwordToHash(pin, pinState.salt).equals(pinState.pinHash)) { 1247 pinState.failedAttempts = 0; 1248 writeUserLocked(mUsers.get(userId)); 1249 return UserManager.PIN_VERIFICATION_SUCCESS; 1250 } else { 1251 pinState.failedAttempts++; 1252 pinState.lastAttemptTime = System.currentTimeMillis(); 1253 writeUserLocked(mUsers.get(userId)); 1254 return waitTime; 1255 } 1256 } 1257 } 1258 } 1259 1260 private int getRemainingTimeForPinAttempt(RestrictionsPinState pinState) { 1261 int backoffIndex = Math.min(pinState.failedAttempts / BACKOFF_INC_INTERVAL, 1262 BACKOFF_TIMES.length - 1); 1263 int backoffTime = (pinState.failedAttempts % BACKOFF_INC_INTERVAL) == 0 ? 1264 BACKOFF_TIMES[backoffIndex] : 0; 1265 return (int) Math.max(backoffTime + pinState.lastAttemptTime - System.currentTimeMillis(), 1266 0); 1267 } 1268 1269 @Override 1270 public boolean hasRestrictionsChallenge() { 1271 int userId = UserHandle.getCallingUserId(); 1272 synchronized (mPackagesLock) { 1273 return hasRestrictionsPinLocked(userId); 1274 } 1275 } 1276 1277 private boolean hasRestrictionsPinLocked(int userId) { 1278 RestrictionsPinState pinState = mRestrictionsPinStates.get(userId); 1279 if (pinState == null || pinState.salt == 0 || pinState.pinHash == null) { 1280 return false; 1281 } 1282 return true; 1283 } 1284 1285 @Override 1286 public void removeRestrictions() { 1287 checkManageUsersPermission("Only system can remove restrictions"); 1288 final int userHandle = UserHandle.getCallingUserId(); 1289 removeRestrictionsForUser(userHandle, true); 1290 } 1291 1292 private void removeRestrictionsForUser(final int userHandle, boolean unblockApps) { 1293 synchronized (mPackagesLock) { 1294 // Remove all user restrictions 1295 setUserRestrictions(new Bundle(), userHandle); 1296 // Remove restrictions pin 1297 setRestrictionsChallenge(null); 1298 // Remove any app restrictions 1299 cleanAppRestrictions(userHandle, true); 1300 } 1301 if (unblockApps) { 1302 unblockAllAppsForUser(userHandle); 1303 } 1304 } 1305 1306 private void unblockAllAppsForUser(final int userHandle) { 1307 mHandler.post(new Runnable() { 1308 @Override 1309 public void run() { 1310 List<ApplicationInfo> apps = 1311 mPm.getInstalledApplications(PackageManager.GET_UNINSTALLED_PACKAGES, 1312 userHandle).getList(); 1313 final long ident = Binder.clearCallingIdentity(); 1314 try { 1315 for (ApplicationInfo appInfo : apps) { 1316 if ((appInfo.flags & ApplicationInfo.FLAG_INSTALLED) != 0 1317 && (appInfo.flags & ApplicationInfo.FLAG_BLOCKED) != 0) { 1318 mPm.setApplicationBlockedSettingAsUser(appInfo.packageName, false, 1319 userHandle); 1320 } 1321 } 1322 } finally { 1323 Binder.restoreCallingIdentity(ident); 1324 } 1325 } 1326 }); 1327 } 1328 1329 /* 1330 * Generate a hash for the given password. To avoid brute force attacks, we use a salted hash. 1331 * Not the most secure, but it is at least a second level of protection. First level is that 1332 * the file is in a location only readable by the system process. 1333 * @param password the password. 1334 * @param salt the randomly generated salt 1335 * @return the hash of the pattern in a String. 1336 */ 1337 private String passwordToHash(String password, long salt) { 1338 if (password == null) { 1339 return null; 1340 } 1341 String algo = null; 1342 String hashed = salt + password; 1343 try { 1344 byte[] saltedPassword = (password + salt).getBytes(); 1345 byte[] sha1 = MessageDigest.getInstance(algo = "SHA-1").digest(saltedPassword); 1346 byte[] md5 = MessageDigest.getInstance(algo = "MD5").digest(saltedPassword); 1347 hashed = toHex(sha1) + toHex(md5); 1348 } catch (NoSuchAlgorithmException e) { 1349 Log.w(LOG_TAG, "Failed to encode string because of missing algorithm: " + algo); 1350 } 1351 return hashed; 1352 } 1353 1354 private static String toHex(byte[] ary) { 1355 final String hex = "0123456789ABCDEF"; 1356 String ret = ""; 1357 for (int i = 0; i < ary.length; i++) { 1358 ret += hex.charAt((ary[i] >> 4) & 0xf); 1359 ret += hex.charAt(ary[i] & 0xf); 1360 } 1361 return ret; 1362 } 1363 1364 private int getUidForPackage(String packageName) { 1365 long ident = Binder.clearCallingIdentity(); 1366 try { 1367 return mContext.getPackageManager().getApplicationInfo(packageName, 1368 PackageManager.GET_UNINSTALLED_PACKAGES).uid; 1369 } catch (NameNotFoundException nnfe) { 1370 return -1; 1371 } finally { 1372 Binder.restoreCallingIdentity(ident); 1373 } 1374 } 1375 1376 private Bundle readApplicationRestrictionsLocked(String packageName, 1377 int userId) { 1378 final Bundle restrictions = new Bundle(); 1379 final ArrayList<String> values = new ArrayList<String>(); 1380 1381 FileInputStream fis = null; 1382 try { 1383 AtomicFile restrictionsFile = 1384 new AtomicFile(new File(Environment.getUserSystemDirectory(userId), 1385 packageToRestrictionsFileName(packageName))); 1386 fis = restrictionsFile.openRead(); 1387 XmlPullParser parser = Xml.newPullParser(); 1388 parser.setInput(fis, null); 1389 int type; 1390 while ((type = parser.next()) != XmlPullParser.START_TAG 1391 && type != XmlPullParser.END_DOCUMENT) { 1392 ; 1393 } 1394 1395 if (type != XmlPullParser.START_TAG) { 1396 Slog.e(LOG_TAG, "Unable to read restrictions file " 1397 + restrictionsFile.getBaseFile()); 1398 return restrictions; 1399 } 1400 1401 while ((type = parser.next()) != XmlPullParser.END_DOCUMENT) { 1402 if (type == XmlPullParser.START_TAG && parser.getName().equals(TAG_ENTRY)) { 1403 String key = parser.getAttributeValue(null, ATTR_KEY); 1404 String valType = parser.getAttributeValue(null, ATTR_VALUE_TYPE); 1405 String multiple = parser.getAttributeValue(null, ATTR_MULTIPLE); 1406 if (multiple != null) { 1407 int count = Integer.parseInt(multiple); 1408 while (count > 0 && (type = parser.next()) != XmlPullParser.END_DOCUMENT) { 1409 if (type == XmlPullParser.START_TAG 1410 && parser.getName().equals(TAG_VALUE)) { 1411 values.add(parser.nextText().trim()); 1412 count--; 1413 } 1414 } 1415 String [] valueStrings = new String[values.size()]; 1416 values.toArray(valueStrings); 1417 restrictions.putStringArray(key, valueStrings); 1418 } else if (ATTR_TYPE_BOOLEAN.equals(valType)) { 1419 restrictions.putBoolean(key, Boolean.parseBoolean( 1420 parser.nextText().trim())); 1421 } else { 1422 String value = parser.nextText().trim(); 1423 restrictions.putString(key, value); 1424 } 1425 } 1426 } 1427 1428 } catch (IOException ioe) { 1429 } catch (XmlPullParserException pe) { 1430 } finally { 1431 if (fis != null) { 1432 try { 1433 fis.close(); 1434 } catch (IOException e) { 1435 } 1436 } 1437 } 1438 return restrictions; 1439 } 1440 1441 private void writeApplicationRestrictionsLocked(String packageName, 1442 Bundle restrictions, int userId) { 1443 FileOutputStream fos = null; 1444 AtomicFile restrictionsFile = new AtomicFile( 1445 new File(Environment.getUserSystemDirectory(userId), 1446 packageToRestrictionsFileName(packageName))); 1447 try { 1448 fos = restrictionsFile.startWrite(); 1449 final BufferedOutputStream bos = new BufferedOutputStream(fos); 1450 1451 // XmlSerializer serializer = XmlUtils.serializerInstance(); 1452 final XmlSerializer serializer = new FastXmlSerializer(); 1453 serializer.setOutput(bos, "utf-8"); 1454 serializer.startDocument(null, true); 1455 serializer.setFeature("http://xmlpull.org/v1/doc/features.html#indent-output", true); 1456 1457 serializer.startTag(null, TAG_RESTRICTIONS); 1458 1459 for (String key : restrictions.keySet()) { 1460 Object value = restrictions.get(key); 1461 serializer.startTag(null, TAG_ENTRY); 1462 serializer.attribute(null, ATTR_KEY, key); 1463 1464 if (value instanceof Boolean) { 1465 serializer.attribute(null, ATTR_VALUE_TYPE, ATTR_TYPE_BOOLEAN); 1466 serializer.text(value.toString()); 1467 } else if (value == null || value instanceof String) { 1468 serializer.attribute(null, ATTR_VALUE_TYPE, ATTR_TYPE_STRING); 1469 serializer.text(value != null ? (String) value : ""); 1470 } else { 1471 serializer.attribute(null, ATTR_VALUE_TYPE, ATTR_TYPE_STRING_ARRAY); 1472 String[] values = (String[]) value; 1473 serializer.attribute(null, ATTR_MULTIPLE, Integer.toString(values.length)); 1474 for (String choice : values) { 1475 serializer.startTag(null, TAG_VALUE); 1476 serializer.text(choice != null ? choice : ""); 1477 serializer.endTag(null, TAG_VALUE); 1478 } 1479 } 1480 serializer.endTag(null, TAG_ENTRY); 1481 } 1482 1483 serializer.endTag(null, TAG_RESTRICTIONS); 1484 1485 serializer.endDocument(); 1486 restrictionsFile.finishWrite(fos); 1487 } catch (Exception e) { 1488 restrictionsFile.failWrite(fos); 1489 Slog.e(LOG_TAG, "Error writing application restrictions list"); 1490 } 1491 } 1492 1493 @Override 1494 public int getUserSerialNumber(int userHandle) { 1495 synchronized (mPackagesLock) { 1496 if (!exists(userHandle)) return -1; 1497 return getUserInfoLocked(userHandle).serialNumber; 1498 } 1499 } 1500 1501 @Override 1502 public int getUserHandle(int userSerialNumber) { 1503 synchronized (mPackagesLock) { 1504 for (int userId : mUserIds) { 1505 if (getUserInfoLocked(userId).serialNumber == userSerialNumber) return userId; 1506 } 1507 // Not found 1508 return -1; 1509 } 1510 } 1511 1512 /** 1513 * Caches the list of user ids in an array, adjusting the array size when necessary. 1514 */ 1515 private void updateUserIdsLocked() { 1516 int num = 0; 1517 for (int i = 0; i < mUsers.size(); i++) { 1518 if (!mUsers.valueAt(i).partial) { 1519 num++; 1520 } 1521 } 1522 final int[] newUsers = new int[num]; 1523 int n = 0; 1524 for (int i = 0; i < mUsers.size(); i++) { 1525 if (!mUsers.valueAt(i).partial) { 1526 newUsers[n++] = mUsers.keyAt(i); 1527 } 1528 } 1529 mUserIds = newUsers; 1530 } 1531 1532 /** 1533 * Make a note of the last started time of a user and do some cleanup. 1534 * @param userId the user that was just foregrounded 1535 */ 1536 public void userForeground(int userId) { 1537 synchronized (mPackagesLock) { 1538 UserInfo user = mUsers.get(userId); 1539 long now = System.currentTimeMillis(); 1540 if (user == null || user.partial) { 1541 Slog.w(LOG_TAG, "userForeground: unknown user #" + userId); 1542 return; 1543 } 1544 if (now > EPOCH_PLUS_30_YEARS) { 1545 user.lastLoggedInTime = now; 1546 writeUserLocked(user); 1547 } 1548 // If this is not a restricted profile and there is no restrictions pin, clean up 1549 // all restrictions files that might have been left behind, else clean up just the 1550 // ones with uninstalled packages 1551 RestrictionsPinState pinState = mRestrictionsPinStates.get(userId); 1552 final long salt = pinState == null ? 0 : pinState.salt; 1553 cleanAppRestrictions(userId, (!user.isRestricted() && salt == 0)); 1554 } 1555 } 1556 1557 /** 1558 * Returns the next available user id, filling in any holes in the ids. 1559 * TODO: May not be a good idea to recycle ids, in case it results in confusion 1560 * for data and battery stats collection, or unexpected cross-talk. 1561 * @return 1562 */ 1563 private int getNextAvailableIdLocked() { 1564 synchronized (mPackagesLock) { 1565 int i = MIN_USER_ID; 1566 while (i < Integer.MAX_VALUE) { 1567 if (mUsers.indexOfKey(i) < 0 && !mRemovingUserIds.get(i)) { 1568 break; 1569 } 1570 i++; 1571 } 1572 return i; 1573 } 1574 } 1575 1576 private String packageToRestrictionsFileName(String packageName) { 1577 return RESTRICTIONS_FILE_PREFIX + packageName + XML_SUFFIX; 1578 } 1579 1580 private String restrictionsFileNameToPackage(String fileName) { 1581 return fileName.substring(RESTRICTIONS_FILE_PREFIX.length(), 1582 (int) (fileName.length() - XML_SUFFIX.length())); 1583 } 1584 1585 @Override 1586 protected void dump(FileDescriptor fd, PrintWriter pw, String[] args) { 1587 if (mContext.checkCallingOrSelfPermission(android.Manifest.permission.DUMP) 1588 != PackageManager.PERMISSION_GRANTED) { 1589 pw.println("Permission Denial: can't dump UserManager from from pid=" 1590 + Binder.getCallingPid() 1591 + ", uid=" + Binder.getCallingUid() 1592 + " without permission " 1593 + android.Manifest.permission.DUMP); 1594 return; 1595 } 1596 1597 long now = System.currentTimeMillis(); 1598 StringBuilder sb = new StringBuilder(); 1599 synchronized (mPackagesLock) { 1600 pw.println("Users:"); 1601 for (int i = 0; i < mUsers.size(); i++) { 1602 UserInfo user = mUsers.valueAt(i); 1603 if (user == null) continue; 1604 pw.print(" "); pw.print(user); pw.print(" serialNo="); pw.print(user.serialNumber); 1605 if (mRemovingUserIds.get(mUsers.keyAt(i))) pw.print(" <removing> "); 1606 if (user.partial) pw.print(" <partial>"); 1607 pw.println(); 1608 pw.print(" Created: "); 1609 if (user.creationTime == 0) { 1610 pw.println("<unknown>"); 1611 } else { 1612 sb.setLength(0); 1613 TimeUtils.formatDuration(now - user.creationTime, sb); 1614 sb.append(" ago"); 1615 pw.println(sb); 1616 } 1617 pw.print(" Last logged in: "); 1618 if (user.lastLoggedInTime == 0) { 1619 pw.println("<unknown>"); 1620 } else { 1621 sb.setLength(0); 1622 TimeUtils.formatDuration(now - user.lastLoggedInTime, sb); 1623 sb.append(" ago"); 1624 pw.println(sb); 1625 } 1626 } 1627 } 1628 } 1629 1630 private PackageMonitor mUserPackageMonitor = new PackageMonitor() { 1631 @Override 1632 public void onPackageRemoved(String pkg, int uid) { 1633 final int userId = this.getChangingUserId(); 1634 // Package could be disappearing because it is being blocked, so also check if 1635 // it has been uninstalled. 1636 final boolean uninstalled = isPackageDisappearing(pkg) == PACKAGE_PERMANENT_CHANGE; 1637 if (uninstalled && userId >= 0 && !isPackageInstalled(pkg, userId)) { 1638 cleanAppRestrictionsForPackage(pkg, userId); 1639 } 1640 } 1641 }; 1642} 1643