UserManagerService.java revision 2a764949c943681a4d25a17a0b203a0127a4a486
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 checkManageUsersPermission("query users"); 262 synchronized (mPackagesLock) { 263 UserInfo user = getUserInfoLocked(userId); 264 ArrayList<UserInfo> users = new ArrayList<UserInfo>(mUsers.size()); 265 for (int i = 0; i < mUsers.size(); i++) { 266 UserInfo profile = mUsers.valueAt(i); 267 if (!isProfileOf(user, profile)) { 268 continue; 269 } 270 users.add(profile); 271 } 272 return users; 273 } 274 } 275 276 private boolean isProfileOf(UserInfo user, UserInfo profile) { 277 return user.id == profile.id || 278 (user.profileGroupId != UserInfo.NO_PROFILE_GROUP_ID 279 && user.profileGroupId == profile.profileGroupId); 280 } 281 282 @Override 283 public UserInfo getUserInfo(int userId) { 284 checkManageUsersPermission("query user"); 285 synchronized (mPackagesLock) { 286 return getUserInfoLocked(userId); 287 } 288 } 289 290 @Override 291 public boolean isRestricted() { 292 synchronized (mPackagesLock) { 293 return getUserInfoLocked(UserHandle.getCallingUserId()).isRestricted(); 294 } 295 } 296 297 /* 298 * Should be locked on mUsers before calling this. 299 */ 300 private UserInfo getUserInfoLocked(int userId) { 301 UserInfo ui = mUsers.get(userId); 302 // If it is partial and not in the process of being removed, return as unknown user. 303 if (ui != null && ui.partial && !mRemovingUserIds.get(userId)) { 304 Slog.w(LOG_TAG, "getUserInfo: unknown user #" + userId); 305 return null; 306 } 307 return ui; 308 } 309 310 public boolean exists(int userId) { 311 synchronized (mPackagesLock) { 312 return ArrayUtils.contains(mUserIds, userId); 313 } 314 } 315 316 @Override 317 public void setUserName(int userId, String name) { 318 checkManageUsersPermission("rename users"); 319 boolean changed = false; 320 synchronized (mPackagesLock) { 321 UserInfo info = mUsers.get(userId); 322 if (info == null || info.partial) { 323 Slog.w(LOG_TAG, "setUserName: unknown user #" + userId); 324 return; 325 } 326 if (name != null && !name.equals(info.name)) { 327 info.name = name; 328 writeUserLocked(info); 329 changed = true; 330 } 331 } 332 if (changed) { 333 sendUserInfoChangedBroadcast(userId); 334 } 335 } 336 337 @Override 338 public void setUserIcon(int userId, Bitmap bitmap) { 339 checkManageUsersPermission("update users"); 340 synchronized (mPackagesLock) { 341 UserInfo info = mUsers.get(userId); 342 if (info == null || info.partial) { 343 Slog.w(LOG_TAG, "setUserIcon: unknown user #" + userId); 344 return; 345 } 346 writeBitmapLocked(info, bitmap); 347 writeUserLocked(info); 348 } 349 sendUserInfoChangedBroadcast(userId); 350 } 351 352 private void sendUserInfoChangedBroadcast(int userId) { 353 Intent changedIntent = new Intent(Intent.ACTION_USER_INFO_CHANGED); 354 changedIntent.putExtra(Intent.EXTRA_USER_HANDLE, userId); 355 changedIntent.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY); 356 mContext.sendBroadcastAsUser(changedIntent, UserHandle.ALL); 357 } 358 359 @Override 360 public Bitmap getUserIcon(int userId) { 361 checkManageUsersPermission("read users"); 362 synchronized (mPackagesLock) { 363 UserInfo info = mUsers.get(userId); 364 if (info == null || info.partial) { 365 Slog.w(LOG_TAG, "getUserIcon: unknown user #" + userId); 366 return null; 367 } 368 if (info.iconPath == null) { 369 return null; 370 } 371 return BitmapFactory.decodeFile(info.iconPath); 372 } 373 } 374 375 @Override 376 public void setGuestEnabled(boolean enable) { 377 checkManageUsersPermission("enable guest users"); 378 synchronized (mPackagesLock) { 379 if (mGuestEnabled != enable) { 380 mGuestEnabled = enable; 381 // Erase any guest user that currently exists 382 for (int i = 0; i < mUsers.size(); i++) { 383 UserInfo user = mUsers.valueAt(i); 384 if (!user.partial && user.isGuest()) { 385 if (!enable) { 386 removeUser(user.id); 387 } 388 return; 389 } 390 } 391 // No guest was found 392 if (enable) { 393 createUser("Guest", UserInfo.FLAG_GUEST); 394 } 395 } 396 } 397 } 398 399 @Override 400 public boolean isGuestEnabled() { 401 synchronized (mPackagesLock) { 402 return mGuestEnabled; 403 } 404 } 405 406 @Override 407 public void wipeUser(int userHandle) { 408 checkManageUsersPermission("wipe user"); 409 // TODO: 410 } 411 412 public void makeInitialized(int userId) { 413 checkManageUsersPermission("makeInitialized"); 414 synchronized (mPackagesLock) { 415 UserInfo info = mUsers.get(userId); 416 if (info == null || info.partial) { 417 Slog.w(LOG_TAG, "makeInitialized: unknown user #" + userId); 418 } 419 if ((info.flags&UserInfo.FLAG_INITIALIZED) == 0) { 420 info.flags |= UserInfo.FLAG_INITIALIZED; 421 writeUserLocked(info); 422 } 423 } 424 } 425 426 @Override 427 public Bundle getUserRestrictions(int userId) { 428 // checkManageUsersPermission("getUserRestrictions"); 429 430 synchronized (mPackagesLock) { 431 Bundle restrictions = mUserRestrictions.get(userId); 432 return restrictions != null ? restrictions : Bundle.EMPTY; 433 } 434 } 435 436 @Override 437 public void setUserRestrictions(Bundle restrictions, int userId) { 438 checkManageUsersPermission("setUserRestrictions"); 439 if (restrictions == null) return; 440 441 synchronized (mPackagesLock) { 442 mUserRestrictions.get(userId).clear(); 443 mUserRestrictions.get(userId).putAll(restrictions); 444 writeUserLocked(mUsers.get(userId)); 445 } 446 } 447 448 /** 449 * Check if we've hit the limit of how many users can be created. 450 */ 451 private boolean isUserLimitReachedLocked() { 452 int nUsers = mUsers.size(); 453 return nUsers >= UserManager.getMaxSupportedUsers(); 454 } 455 456 /** 457 * Enforces that only the system UID or root's UID or apps that have the 458 * {@link android.Manifest.permission#MANAGE_USERS MANAGE_USERS} 459 * permission can make certain calls to the UserManager. 460 * 461 * @param message used as message if SecurityException is thrown 462 * @throws SecurityException if the caller is not system or root 463 */ 464 private static final void checkManageUsersPermission(String message) { 465 final int uid = Binder.getCallingUid(); 466 if (uid != Process.SYSTEM_UID && uid != 0 467 && ActivityManager.checkComponentPermission( 468 android.Manifest.permission.MANAGE_USERS, 469 uid, -1, true) != PackageManager.PERMISSION_GRANTED) { 470 throw new SecurityException("You need MANAGE_USERS permission to: " + message); 471 } 472 } 473 474 private void writeBitmapLocked(UserInfo info, Bitmap bitmap) { 475 try { 476 File dir = new File(mUsersDir, Integer.toString(info.id)); 477 File file = new File(dir, USER_PHOTO_FILENAME); 478 if (!dir.exists()) { 479 dir.mkdir(); 480 FileUtils.setPermissions( 481 dir.getPath(), 482 FileUtils.S_IRWXU|FileUtils.S_IRWXG|FileUtils.S_IXOTH, 483 -1, -1); 484 } 485 FileOutputStream os; 486 if (bitmap.compress(Bitmap.CompressFormat.PNG, 100, os = new FileOutputStream(file))) { 487 info.iconPath = file.getAbsolutePath(); 488 } 489 try { 490 os.close(); 491 } catch (IOException ioe) { 492 // What the ... ! 493 } 494 } catch (FileNotFoundException e) { 495 Slog.w(LOG_TAG, "Error setting photo for user ", e); 496 } 497 } 498 499 /** 500 * Returns an array of user ids. This array is cached here for quick access, so do not modify or 501 * cache it elsewhere. 502 * @return the array of user ids. 503 */ 504 public int[] getUserIds() { 505 synchronized (mPackagesLock) { 506 return mUserIds; 507 } 508 } 509 510 int[] getUserIdsLPr() { 511 return mUserIds; 512 } 513 514 private void readUserListLocked() { 515 mGuestEnabled = false; 516 if (!mUserListFile.exists()) { 517 fallbackToSingleUserLocked(); 518 return; 519 } 520 FileInputStream fis = null; 521 AtomicFile userListFile = new AtomicFile(mUserListFile); 522 try { 523 fis = userListFile.openRead(); 524 XmlPullParser parser = Xml.newPullParser(); 525 parser.setInput(fis, null); 526 int type; 527 while ((type = parser.next()) != XmlPullParser.START_TAG 528 && type != XmlPullParser.END_DOCUMENT) { 529 ; 530 } 531 532 if (type != XmlPullParser.START_TAG) { 533 Slog.e(LOG_TAG, "Unable to read user list"); 534 fallbackToSingleUserLocked(); 535 return; 536 } 537 538 mNextSerialNumber = -1; 539 if (parser.getName().equals(TAG_USERS)) { 540 String lastSerialNumber = parser.getAttributeValue(null, ATTR_NEXT_SERIAL_NO); 541 if (lastSerialNumber != null) { 542 mNextSerialNumber = Integer.parseInt(lastSerialNumber); 543 } 544 String versionNumber = parser.getAttributeValue(null, ATTR_USER_VERSION); 545 if (versionNumber != null) { 546 mUserVersion = Integer.parseInt(versionNumber); 547 } 548 } 549 550 while ((type = parser.next()) != XmlPullParser.END_DOCUMENT) { 551 if (type == XmlPullParser.START_TAG && parser.getName().equals(TAG_USER)) { 552 String id = parser.getAttributeValue(null, ATTR_ID); 553 UserInfo user = readUserLocked(Integer.parseInt(id)); 554 555 if (user != null) { 556 mUsers.put(user.id, user); 557 if (user.isGuest()) { 558 mGuestEnabled = true; 559 } 560 if (mNextSerialNumber < 0 || mNextSerialNumber <= user.id) { 561 mNextSerialNumber = user.id + 1; 562 } 563 } 564 } 565 } 566 updateUserIdsLocked(); 567 upgradeIfNecessaryLocked(); 568 } catch (IOException ioe) { 569 fallbackToSingleUserLocked(); 570 } catch (XmlPullParserException pe) { 571 fallbackToSingleUserLocked(); 572 } finally { 573 if (fis != null) { 574 try { 575 fis.close(); 576 } catch (IOException e) { 577 } 578 } 579 } 580 } 581 582 /** 583 * Upgrade steps between versions, either for fixing bugs or changing the data format. 584 */ 585 private void upgradeIfNecessaryLocked() { 586 int userVersion = mUserVersion; 587 if (userVersion < 1) { 588 // Assign a proper name for the owner, if not initialized correctly before 589 UserInfo user = mUsers.get(UserHandle.USER_OWNER); 590 if ("Primary".equals(user.name)) { 591 user.name = mContext.getResources().getString(com.android.internal.R.string.owner_name); 592 writeUserLocked(user); 593 } 594 userVersion = 1; 595 } 596 597 if (userVersion < 2) { 598 // Owner should be marked as initialized 599 UserInfo user = mUsers.get(UserHandle.USER_OWNER); 600 if ((user.flags & UserInfo.FLAG_INITIALIZED) == 0) { 601 user.flags |= UserInfo.FLAG_INITIALIZED; 602 writeUserLocked(user); 603 } 604 userVersion = 2; 605 } 606 607 608 if (userVersion < 4) { 609 userVersion = 4; 610 } 611 612 if (userVersion < USER_VERSION) { 613 Slog.w(LOG_TAG, "User version " + mUserVersion + " didn't upgrade as expected to " 614 + USER_VERSION); 615 } else { 616 mUserVersion = userVersion; 617 writeUserListLocked(); 618 } 619 } 620 621 private void fallbackToSingleUserLocked() { 622 // Create the primary user 623 UserInfo primary = new UserInfo(UserHandle.USER_OWNER, 624 mContext.getResources().getString(com.android.internal.R.string.owner_name), null, 625 UserInfo.FLAG_ADMIN | UserInfo.FLAG_PRIMARY | UserInfo.FLAG_INITIALIZED); 626 mUsers.put(0, primary); 627 mNextSerialNumber = MIN_USER_ID; 628 mUserVersion = USER_VERSION; 629 630 Bundle restrictions = new Bundle(); 631 mUserRestrictions.append(UserHandle.USER_OWNER, restrictions); 632 633 updateUserIdsLocked(); 634 635 writeUserListLocked(); 636 writeUserLocked(primary); 637 } 638 639 /* 640 * Writes the user file in this format: 641 * 642 * <user flags="20039023" id="0"> 643 * <name>Primary</name> 644 * </user> 645 */ 646 private void writeUserLocked(UserInfo userInfo) { 647 FileOutputStream fos = null; 648 AtomicFile userFile = new AtomicFile(new File(mUsersDir, userInfo.id + XML_SUFFIX)); 649 try { 650 fos = userFile.startWrite(); 651 final BufferedOutputStream bos = new BufferedOutputStream(fos); 652 653 // XmlSerializer serializer = XmlUtils.serializerInstance(); 654 final XmlSerializer serializer = new FastXmlSerializer(); 655 serializer.setOutput(bos, "utf-8"); 656 serializer.startDocument(null, true); 657 serializer.setFeature("http://xmlpull.org/v1/doc/features.html#indent-output", true); 658 659 serializer.startTag(null, TAG_USER); 660 serializer.attribute(null, ATTR_ID, Integer.toString(userInfo.id)); 661 serializer.attribute(null, ATTR_SERIAL_NO, Integer.toString(userInfo.serialNumber)); 662 serializer.attribute(null, ATTR_FLAGS, Integer.toString(userInfo.flags)); 663 serializer.attribute(null, ATTR_CREATION_TIME, Long.toString(userInfo.creationTime)); 664 serializer.attribute(null, ATTR_LAST_LOGGED_IN_TIME, 665 Long.toString(userInfo.lastLoggedInTime)); 666 RestrictionsPinState pinState = mRestrictionsPinStates.get(userInfo.id); 667 if (pinState != null) { 668 if (pinState.salt != 0) { 669 serializer.attribute(null, ATTR_SALT, Long.toString(pinState.salt)); 670 } 671 if (pinState.pinHash != null) { 672 serializer.attribute(null, ATTR_PIN_HASH, pinState.pinHash); 673 } 674 if (pinState.failedAttempts != 0) { 675 serializer.attribute(null, ATTR_FAILED_ATTEMPTS, 676 Integer.toString(pinState.failedAttempts)); 677 serializer.attribute(null, ATTR_LAST_RETRY_MS, 678 Long.toString(pinState.lastAttemptTime)); 679 } 680 } 681 if (userInfo.iconPath != null) { 682 serializer.attribute(null, ATTR_ICON_PATH, userInfo.iconPath); 683 } 684 if (userInfo.partial) { 685 serializer.attribute(null, ATTR_PARTIAL, "true"); 686 } 687 if (userInfo.profileGroupId != UserInfo.NO_PROFILE_GROUP_ID) { 688 serializer.attribute(null, ATTR_PROFILE_GROUP_ID, 689 Integer.toString(userInfo.profileGroupId)); 690 } 691 692 serializer.startTag(null, TAG_NAME); 693 serializer.text(userInfo.name); 694 serializer.endTag(null, TAG_NAME); 695 696 Bundle restrictions = mUserRestrictions.get(userInfo.id); 697 if (restrictions != null) { 698 serializer.startTag(null, TAG_RESTRICTIONS); 699 writeBoolean(serializer, restrictions, UserManager.DISALLOW_CONFIG_WIFI); 700 writeBoolean(serializer, restrictions, UserManager.DISALLOW_MODIFY_ACCOUNTS); 701 writeBoolean(serializer, restrictions, UserManager.DISALLOW_INSTALL_APPS); 702 writeBoolean(serializer, restrictions, UserManager.DISALLOW_UNINSTALL_APPS); 703 writeBoolean(serializer, restrictions, UserManager.DISALLOW_SHARE_LOCATION); 704 writeBoolean(serializer, restrictions, 705 UserManager.DISALLOW_INSTALL_UNKNOWN_SOURCES); 706 writeBoolean(serializer, restrictions, UserManager.DISALLOW_CONFIG_BLUETOOTH); 707 writeBoolean(serializer, restrictions, UserManager.DISALLOW_USB_FILE_TRANSFER); 708 writeBoolean(serializer, restrictions, UserManager.DISALLOW_CONFIG_CREDENTIALS); 709 writeBoolean(serializer, restrictions, UserManager.DISALLOW_REMOVE_USER); 710 serializer.endTag(null, TAG_RESTRICTIONS); 711 } 712 serializer.endTag(null, TAG_USER); 713 714 serializer.endDocument(); 715 userFile.finishWrite(fos); 716 } catch (Exception ioe) { 717 Slog.e(LOG_TAG, "Error writing user info " + userInfo.id + "\n" + ioe); 718 userFile.failWrite(fos); 719 } 720 } 721 722 /* 723 * Writes the user list file in this format: 724 * 725 * <users nextSerialNumber="3"> 726 * <user id="0"></user> 727 * <user id="2"></user> 728 * </users> 729 */ 730 private void writeUserListLocked() { 731 FileOutputStream fos = null; 732 AtomicFile userListFile = new AtomicFile(mUserListFile); 733 try { 734 fos = userListFile.startWrite(); 735 final BufferedOutputStream bos = new BufferedOutputStream(fos); 736 737 // XmlSerializer serializer = XmlUtils.serializerInstance(); 738 final XmlSerializer serializer = new FastXmlSerializer(); 739 serializer.setOutput(bos, "utf-8"); 740 serializer.startDocument(null, true); 741 serializer.setFeature("http://xmlpull.org/v1/doc/features.html#indent-output", true); 742 743 serializer.startTag(null, TAG_USERS); 744 serializer.attribute(null, ATTR_NEXT_SERIAL_NO, Integer.toString(mNextSerialNumber)); 745 serializer.attribute(null, ATTR_USER_VERSION, Integer.toString(mUserVersion)); 746 747 for (int i = 0; i < mUsers.size(); i++) { 748 UserInfo user = mUsers.valueAt(i); 749 serializer.startTag(null, TAG_USER); 750 serializer.attribute(null, ATTR_ID, Integer.toString(user.id)); 751 serializer.endTag(null, TAG_USER); 752 } 753 754 serializer.endTag(null, TAG_USERS); 755 756 serializer.endDocument(); 757 userListFile.finishWrite(fos); 758 } catch (Exception e) { 759 userListFile.failWrite(fos); 760 Slog.e(LOG_TAG, "Error writing user list"); 761 } 762 } 763 764 private UserInfo readUserLocked(int id) { 765 int flags = 0; 766 int serialNumber = id; 767 String name = null; 768 String iconPath = null; 769 long creationTime = 0L; 770 long lastLoggedInTime = 0L; 771 long salt = 0L; 772 String pinHash = null; 773 int failedAttempts = 0; 774 int profileGroupId = UserInfo.NO_PROFILE_GROUP_ID; 775 long lastAttemptTime = 0L; 776 boolean partial = false; 777 Bundle restrictions = new Bundle(); 778 779 FileInputStream fis = null; 780 try { 781 AtomicFile userFile = 782 new AtomicFile(new File(mUsersDir, Integer.toString(id) + XML_SUFFIX)); 783 fis = userFile.openRead(); 784 XmlPullParser parser = Xml.newPullParser(); 785 parser.setInput(fis, null); 786 int type; 787 while ((type = parser.next()) != XmlPullParser.START_TAG 788 && type != XmlPullParser.END_DOCUMENT) { 789 ; 790 } 791 792 if (type != XmlPullParser.START_TAG) { 793 Slog.e(LOG_TAG, "Unable to read user " + id); 794 return null; 795 } 796 797 if (type == XmlPullParser.START_TAG && parser.getName().equals(TAG_USER)) { 798 int storedId = readIntAttribute(parser, ATTR_ID, -1); 799 if (storedId != id) { 800 Slog.e(LOG_TAG, "User id does not match the file name"); 801 return null; 802 } 803 serialNumber = readIntAttribute(parser, ATTR_SERIAL_NO, id); 804 flags = readIntAttribute(parser, ATTR_FLAGS, 0); 805 iconPath = parser.getAttributeValue(null, ATTR_ICON_PATH); 806 creationTime = readLongAttribute(parser, ATTR_CREATION_TIME, 0); 807 lastLoggedInTime = readLongAttribute(parser, ATTR_LAST_LOGGED_IN_TIME, 0); 808 salt = readLongAttribute(parser, ATTR_SALT, 0L); 809 pinHash = parser.getAttributeValue(null, ATTR_PIN_HASH); 810 failedAttempts = readIntAttribute(parser, ATTR_FAILED_ATTEMPTS, 0); 811 lastAttemptTime = readLongAttribute(parser, ATTR_LAST_RETRY_MS, 0L); 812 profileGroupId = readIntAttribute(parser, ATTR_PROFILE_GROUP_ID, 813 UserInfo.NO_PROFILE_GROUP_ID); 814 if (profileGroupId == UserInfo.NO_PROFILE_GROUP_ID) { 815 // This attribute was added and renamed during development of L. 816 // TODO Remove upgrade path by 1st May 2014 817 profileGroupId = readIntAttribute(parser, "relatedGroupId", 818 UserInfo.NO_PROFILE_GROUP_ID); 819 } 820 String valueString = parser.getAttributeValue(null, ATTR_PARTIAL); 821 if ("true".equals(valueString)) { 822 partial = true; 823 } 824 825 int outerDepth = parser.getDepth(); 826 while ((type = parser.next()) != XmlPullParser.END_DOCUMENT 827 && (type != XmlPullParser.END_TAG || parser.getDepth() > outerDepth)) { 828 if (type == XmlPullParser.END_TAG || type == XmlPullParser.TEXT) { 829 continue; 830 } 831 String tag = parser.getName(); 832 if (TAG_NAME.equals(tag)) { 833 type = parser.next(); 834 if (type == XmlPullParser.TEXT) { 835 name = parser.getText(); 836 } 837 } else if (TAG_RESTRICTIONS.equals(tag)) { 838 readBoolean(parser, restrictions, UserManager.DISALLOW_CONFIG_WIFI); 839 readBoolean(parser, restrictions, UserManager.DISALLOW_MODIFY_ACCOUNTS); 840 readBoolean(parser, restrictions, UserManager.DISALLOW_INSTALL_APPS); 841 readBoolean(parser, restrictions, UserManager.DISALLOW_UNINSTALL_APPS); 842 readBoolean(parser, restrictions, UserManager.DISALLOW_SHARE_LOCATION); 843 readBoolean(parser, restrictions, 844 UserManager.DISALLOW_INSTALL_UNKNOWN_SOURCES); 845 readBoolean(parser, restrictions, UserManager.DISALLOW_CONFIG_BLUETOOTH); 846 readBoolean(parser, restrictions, UserManager.DISALLOW_USB_FILE_TRANSFER); 847 readBoolean(parser, restrictions, UserManager.DISALLOW_CONFIG_CREDENTIALS); 848 readBoolean(parser, restrictions, UserManager.DISALLOW_REMOVE_USER); 849 } 850 } 851 } 852 853 UserInfo userInfo = new UserInfo(id, name, iconPath, flags); 854 userInfo.serialNumber = serialNumber; 855 userInfo.creationTime = creationTime; 856 userInfo.lastLoggedInTime = lastLoggedInTime; 857 userInfo.partial = partial; 858 userInfo.profileGroupId = profileGroupId; 859 mUserRestrictions.append(id, restrictions); 860 if (salt != 0L) { 861 RestrictionsPinState pinState = mRestrictionsPinStates.get(id); 862 if (pinState == null) { 863 pinState = new RestrictionsPinState(); 864 mRestrictionsPinStates.put(id, pinState); 865 } 866 pinState.salt = salt; 867 pinState.pinHash = pinHash; 868 pinState.failedAttempts = failedAttempts; 869 pinState.lastAttemptTime = lastAttemptTime; 870 } 871 return userInfo; 872 873 } catch (IOException ioe) { 874 } catch (XmlPullParserException pe) { 875 } finally { 876 if (fis != null) { 877 try { 878 fis.close(); 879 } catch (IOException e) { 880 } 881 } 882 } 883 return null; 884 } 885 886 private void readBoolean(XmlPullParser parser, Bundle restrictions, 887 String restrictionKey) { 888 String value = parser.getAttributeValue(null, restrictionKey); 889 if (value != null) { 890 restrictions.putBoolean(restrictionKey, Boolean.parseBoolean(value)); 891 } 892 } 893 894 private void writeBoolean(XmlSerializer xml, Bundle restrictions, String restrictionKey) 895 throws IOException { 896 if (restrictions.containsKey(restrictionKey)) { 897 xml.attribute(null, restrictionKey, 898 Boolean.toString(restrictions.getBoolean(restrictionKey))); 899 } 900 } 901 902 private int readIntAttribute(XmlPullParser parser, String attr, int defaultValue) { 903 String valueString = parser.getAttributeValue(null, attr); 904 if (valueString == null) return defaultValue; 905 try { 906 return Integer.parseInt(valueString); 907 } catch (NumberFormatException nfe) { 908 return defaultValue; 909 } 910 } 911 912 private long readLongAttribute(XmlPullParser parser, String attr, long defaultValue) { 913 String valueString = parser.getAttributeValue(null, attr); 914 if (valueString == null) return defaultValue; 915 try { 916 return Long.parseLong(valueString); 917 } catch (NumberFormatException nfe) { 918 return defaultValue; 919 } 920 } 921 922 private boolean isPackageInstalled(String pkg, int userId) { 923 final ApplicationInfo info = mPm.getApplicationInfo(pkg, 924 PackageManager.GET_UNINSTALLED_PACKAGES, 925 userId); 926 if (info == null || (info.flags&ApplicationInfo.FLAG_INSTALLED) == 0) { 927 return false; 928 } 929 return true; 930 } 931 932 /** 933 * Removes all the restrictions files (res_<packagename>) for a given user, if all is true, 934 * else removes only those packages that have been uninstalled. 935 * Does not do any permissions checking. 936 */ 937 private void cleanAppRestrictions(int userId, boolean all) { 938 synchronized (mPackagesLock) { 939 File dir = Environment.getUserSystemDirectory(userId); 940 String[] files = dir.list(); 941 if (files == null) return; 942 for (String fileName : files) { 943 if (fileName.startsWith(RESTRICTIONS_FILE_PREFIX)) { 944 File resFile = new File(dir, fileName); 945 if (resFile.exists()) { 946 if (all) { 947 resFile.delete(); 948 } else { 949 String pkg = restrictionsFileNameToPackage(fileName); 950 if (!isPackageInstalled(pkg, userId)) { 951 resFile.delete(); 952 } 953 } 954 } 955 } 956 } 957 } 958 } 959 960 /** 961 * Removes the app restrictions file for a specific package and user id, if it exists. 962 */ 963 private void cleanAppRestrictionsForPackage(String pkg, int userId) { 964 synchronized (mPackagesLock) { 965 File dir = Environment.getUserSystemDirectory(userId); 966 File resFile = new File(dir, packageToRestrictionsFileName(pkg)); 967 if (resFile.exists()) { 968 resFile.delete(); 969 } 970 } 971 } 972 973 private int getNextProfileGroupIdLocked() { 974 int maxGroupId = UserInfo.NO_PROFILE_GROUP_ID; 975 for (int i = 0; i < mUsers.size(); i++) { 976 UserInfo ui = mUsers.valueAt(i); 977 if (maxGroupId < ui.profileGroupId) { 978 maxGroupId = ui.profileGroupId; 979 } 980 } 981 return maxGroupId + 1; 982 } 983 984 @Override 985 public UserInfo createProfileForUser(String name, int flags, int userId) { 986 checkManageUsersPermission("Only the system can create users"); 987 if (userId != UserHandle.USER_OWNER) { 988 Slog.w(LOG_TAG, "Only user owner can have profiles"); 989 return null; 990 } 991 return createUserInternal(name, flags, userId); 992 } 993 994 @Override 995 public UserInfo createUser(String name, int flags) { 996 checkManageUsersPermission("Only the system can create users"); 997 return createUserInternal(name, flags, UserHandle.USER_NULL); 998 } 999 1000 private UserInfo createUserInternal(String name, int flags, int profileId) { 1001 final long ident = Binder.clearCallingIdentity(); 1002 UserInfo userInfo = null; 1003 try { 1004 synchronized (mInstallLock) { 1005 synchronized (mPackagesLock) { 1006 UserInfo profile = null; 1007 if (profileId != UserHandle.USER_NULL) { 1008 profile = getUserInfoLocked(profileId); 1009 if (profile == null) return null; 1010 } 1011 if (isUserLimitReachedLocked()) return null; 1012 int userId = getNextAvailableIdLocked(); 1013 userInfo = new UserInfo(userId, name, null, flags); 1014 File userPath = new File(mBaseUserPath, Integer.toString(userId)); 1015 userInfo.serialNumber = mNextSerialNumber++; 1016 long now = System.currentTimeMillis(); 1017 userInfo.creationTime = (now > EPOCH_PLUS_30_YEARS) ? now : 0; 1018 userInfo.partial = true; 1019 Environment.getUserSystemDirectory(userInfo.id).mkdirs(); 1020 mUsers.put(userId, userInfo); 1021 writeUserListLocked(); 1022 if (profile != null) { 1023 if (profile.profileGroupId == UserInfo.NO_PROFILE_GROUP_ID) { 1024 profile.profileGroupId = getNextProfileGroupIdLocked(); 1025 writeUserLocked(profile); 1026 } 1027 userInfo.profileGroupId = profile.profileGroupId; 1028 } 1029 writeUserLocked(userInfo); 1030 mPm.createNewUserLILPw(userId, userPath); 1031 userInfo.partial = false; 1032 writeUserLocked(userInfo); 1033 updateUserIdsLocked(); 1034 Bundle restrictions = new Bundle(); 1035 mUserRestrictions.append(userId, restrictions); 1036 } 1037 } 1038 if (userInfo != null) { 1039 Intent addedIntent = new Intent(Intent.ACTION_USER_ADDED); 1040 addedIntent.putExtra(Intent.EXTRA_USER_HANDLE, userInfo.id); 1041 mContext.sendBroadcastAsUser(addedIntent, UserHandle.ALL, 1042 android.Manifest.permission.MANAGE_USERS); 1043 } 1044 } finally { 1045 Binder.restoreCallingIdentity(ident); 1046 } 1047 return userInfo; 1048 } 1049 1050 /** 1051 * Removes a user and all data directories created for that user. This method should be called 1052 * after the user's processes have been terminated. 1053 * @param userHandle the user's id 1054 */ 1055 public boolean removeUser(int userHandle) { 1056 checkManageUsersPermission("Only the system can remove users"); 1057 final UserInfo user; 1058 synchronized (mPackagesLock) { 1059 user = mUsers.get(userHandle); 1060 if (userHandle == 0 || user == null) { 1061 return false; 1062 } 1063 mRemovingUserIds.put(userHandle, true); 1064 // Set this to a partially created user, so that the user will be purged 1065 // on next startup, in case the runtime stops now before stopping and 1066 // removing the user completely. 1067 user.partial = true; 1068 writeUserLocked(user); 1069 } 1070 if (DBG) Slog.i(LOG_TAG, "Stopping user " + userHandle); 1071 int res; 1072 try { 1073 res = ActivityManagerNative.getDefault().stopUser(userHandle, 1074 new IStopUserCallback.Stub() { 1075 @Override 1076 public void userStopped(int userId) { 1077 finishRemoveUser(userId); 1078 } 1079 @Override 1080 public void userStopAborted(int userId) { 1081 } 1082 }); 1083 } catch (RemoteException e) { 1084 return false; 1085 } 1086 1087 return res == ActivityManager.USER_OP_SUCCESS; 1088 } 1089 1090 void finishRemoveUser(final int userHandle) { 1091 if (DBG) Slog.i(LOG_TAG, "finishRemoveUser " + userHandle); 1092 // Let other services shutdown any activity and clean up their state before completely 1093 // wiping the user's system directory and removing from the user list 1094 long ident = Binder.clearCallingIdentity(); 1095 try { 1096 Intent addedIntent = new Intent(Intent.ACTION_USER_REMOVED); 1097 addedIntent.putExtra(Intent.EXTRA_USER_HANDLE, userHandle); 1098 mContext.sendOrderedBroadcastAsUser(addedIntent, UserHandle.ALL, 1099 android.Manifest.permission.MANAGE_USERS, 1100 1101 new BroadcastReceiver() { 1102 @Override 1103 public void onReceive(Context context, Intent intent) { 1104 if (DBG) { 1105 Slog.i(LOG_TAG, 1106 "USER_REMOVED broadcast sent, cleaning up user data " 1107 + userHandle); 1108 } 1109 new Thread() { 1110 public void run() { 1111 synchronized (mInstallLock) { 1112 synchronized (mPackagesLock) { 1113 removeUserStateLocked(userHandle); 1114 } 1115 } 1116 } 1117 }.start(); 1118 } 1119 }, 1120 1121 null, Activity.RESULT_OK, null, null); 1122 } finally { 1123 Binder.restoreCallingIdentity(ident); 1124 } 1125 } 1126 1127 private void removeUserStateLocked(final int userHandle) { 1128 // Cleanup package manager settings 1129 mPm.cleanUpUserLILPw(userHandle); 1130 1131 // Remove this user from the list 1132 mUsers.remove(userHandle); 1133 1134 // Have user ID linger for several seconds to let external storage VFS 1135 // cache entries expire. This must be greater than the 'entry_valid' 1136 // timeout used by the FUSE daemon. 1137 mHandler.postDelayed(new Runnable() { 1138 @Override 1139 public void run() { 1140 synchronized (mPackagesLock) { 1141 mRemovingUserIds.delete(userHandle); 1142 } 1143 } 1144 }, MINUTE_IN_MILLIS); 1145 1146 mRestrictionsPinStates.remove(userHandle); 1147 // Remove user file 1148 AtomicFile userFile = new AtomicFile(new File(mUsersDir, userHandle + XML_SUFFIX)); 1149 userFile.delete(); 1150 // Update the user list 1151 writeUserListLocked(); 1152 updateUserIdsLocked(); 1153 removeDirectoryRecursive(Environment.getUserSystemDirectory(userHandle)); 1154 } 1155 1156 private void removeDirectoryRecursive(File parent) { 1157 if (parent.isDirectory()) { 1158 String[] files = parent.list(); 1159 for (String filename : files) { 1160 File child = new File(parent, filename); 1161 removeDirectoryRecursive(child); 1162 } 1163 } 1164 parent.delete(); 1165 } 1166 1167 @Override 1168 public Bundle getApplicationRestrictions(String packageName) { 1169 return getApplicationRestrictionsForUser(packageName, UserHandle.getCallingUserId()); 1170 } 1171 1172 @Override 1173 public Bundle getApplicationRestrictionsForUser(String packageName, int userId) { 1174 if (UserHandle.getCallingUserId() != userId 1175 || !UserHandle.isSameApp(Binder.getCallingUid(), getUidForPackage(packageName))) { 1176 checkManageUsersPermission("Only system can get restrictions for other users/apps"); 1177 } 1178 synchronized (mPackagesLock) { 1179 // Read the restrictions from XML 1180 return readApplicationRestrictionsLocked(packageName, userId); 1181 } 1182 } 1183 1184 @Override 1185 public void setApplicationRestrictions(String packageName, Bundle restrictions, 1186 int userId) { 1187 if (UserHandle.getCallingUserId() != userId 1188 || !UserHandle.isSameApp(Binder.getCallingUid(), getUidForPackage(packageName))) { 1189 checkManageUsersPermission("Only system can set restrictions for other users/apps"); 1190 } 1191 synchronized (mPackagesLock) { 1192 // Write the restrictions to XML 1193 writeApplicationRestrictionsLocked(packageName, restrictions, userId); 1194 } 1195 } 1196 1197 @Override 1198 public boolean setRestrictionsChallenge(String newPin) { 1199 checkManageUsersPermission("Only system can modify the restrictions pin"); 1200 int userId = UserHandle.getCallingUserId(); 1201 synchronized (mPackagesLock) { 1202 RestrictionsPinState pinState = mRestrictionsPinStates.get(userId); 1203 if (pinState == null) { 1204 pinState = new RestrictionsPinState(); 1205 } 1206 if (newPin == null) { 1207 pinState.salt = 0; 1208 pinState.pinHash = null; 1209 } else { 1210 try { 1211 pinState.salt = SecureRandom.getInstance("SHA1PRNG").nextLong(); 1212 } catch (NoSuchAlgorithmException e) { 1213 pinState.salt = (long) (Math.random() * Long.MAX_VALUE); 1214 } 1215 pinState.pinHash = passwordToHash(newPin, pinState.salt); 1216 pinState.failedAttempts = 0; 1217 } 1218 mRestrictionsPinStates.put(userId, pinState); 1219 writeUserLocked(mUsers.get(userId)); 1220 } 1221 return true; 1222 } 1223 1224 @Override 1225 public int checkRestrictionsChallenge(String pin) { 1226 checkManageUsersPermission("Only system can verify the restrictions pin"); 1227 int userId = UserHandle.getCallingUserId(); 1228 synchronized (mPackagesLock) { 1229 RestrictionsPinState pinState = mRestrictionsPinStates.get(userId); 1230 // If there's no pin set, return error code 1231 if (pinState == null || pinState.salt == 0 || pinState.pinHash == null) { 1232 return UserManager.PIN_VERIFICATION_FAILED_NOT_SET; 1233 } else if (pin == null) { 1234 // If just checking if user can be prompted, return remaining time 1235 int waitTime = getRemainingTimeForPinAttempt(pinState); 1236 Slog.d(LOG_TAG, "Remaining waittime peek=" + waitTime); 1237 return waitTime; 1238 } else { 1239 int waitTime = getRemainingTimeForPinAttempt(pinState); 1240 Slog.d(LOG_TAG, "Remaining waittime=" + waitTime); 1241 if (waitTime > 0) { 1242 return waitTime; 1243 } 1244 if (passwordToHash(pin, pinState.salt).equals(pinState.pinHash)) { 1245 pinState.failedAttempts = 0; 1246 writeUserLocked(mUsers.get(userId)); 1247 return UserManager.PIN_VERIFICATION_SUCCESS; 1248 } else { 1249 pinState.failedAttempts++; 1250 pinState.lastAttemptTime = System.currentTimeMillis(); 1251 writeUserLocked(mUsers.get(userId)); 1252 return waitTime; 1253 } 1254 } 1255 } 1256 } 1257 1258 private int getRemainingTimeForPinAttempt(RestrictionsPinState pinState) { 1259 int backoffIndex = Math.min(pinState.failedAttempts / BACKOFF_INC_INTERVAL, 1260 BACKOFF_TIMES.length - 1); 1261 int backoffTime = (pinState.failedAttempts % BACKOFF_INC_INTERVAL) == 0 ? 1262 BACKOFF_TIMES[backoffIndex] : 0; 1263 return (int) Math.max(backoffTime + pinState.lastAttemptTime - System.currentTimeMillis(), 1264 0); 1265 } 1266 1267 @Override 1268 public boolean hasRestrictionsChallenge() { 1269 int userId = UserHandle.getCallingUserId(); 1270 synchronized (mPackagesLock) { 1271 return hasRestrictionsPinLocked(userId); 1272 } 1273 } 1274 1275 private boolean hasRestrictionsPinLocked(int userId) { 1276 RestrictionsPinState pinState = mRestrictionsPinStates.get(userId); 1277 if (pinState == null || pinState.salt == 0 || pinState.pinHash == null) { 1278 return false; 1279 } 1280 return true; 1281 } 1282 1283 @Override 1284 public void removeRestrictions() { 1285 checkManageUsersPermission("Only system can remove restrictions"); 1286 final int userHandle = UserHandle.getCallingUserId(); 1287 removeRestrictionsForUser(userHandle, true); 1288 } 1289 1290 private void removeRestrictionsForUser(final int userHandle, boolean unblockApps) { 1291 synchronized (mPackagesLock) { 1292 // Remove all user restrictions 1293 setUserRestrictions(new Bundle(), userHandle); 1294 // Remove restrictions pin 1295 setRestrictionsChallenge(null); 1296 // Remove any app restrictions 1297 cleanAppRestrictions(userHandle, true); 1298 } 1299 if (unblockApps) { 1300 unblockAllAppsForUser(userHandle); 1301 } 1302 } 1303 1304 private void unblockAllAppsForUser(final int userHandle) { 1305 mHandler.post(new Runnable() { 1306 @Override 1307 public void run() { 1308 List<ApplicationInfo> apps = 1309 mPm.getInstalledApplications(PackageManager.GET_UNINSTALLED_PACKAGES, 1310 userHandle).getList(); 1311 final long ident = Binder.clearCallingIdentity(); 1312 try { 1313 for (ApplicationInfo appInfo : apps) { 1314 if ((appInfo.flags & ApplicationInfo.FLAG_INSTALLED) != 0 1315 && (appInfo.flags & ApplicationInfo.FLAG_BLOCKED) != 0) { 1316 mPm.setApplicationBlockedSettingAsUser(appInfo.packageName, false, 1317 userHandle); 1318 } 1319 } 1320 } finally { 1321 Binder.restoreCallingIdentity(ident); 1322 } 1323 } 1324 }); 1325 } 1326 1327 /* 1328 * Generate a hash for the given password. To avoid brute force attacks, we use a salted hash. 1329 * Not the most secure, but it is at least a second level of protection. First level is that 1330 * the file is in a location only readable by the system process. 1331 * @param password the password. 1332 * @param salt the randomly generated salt 1333 * @return the hash of the pattern in a String. 1334 */ 1335 private String passwordToHash(String password, long salt) { 1336 if (password == null) { 1337 return null; 1338 } 1339 String algo = null; 1340 String hashed = salt + password; 1341 try { 1342 byte[] saltedPassword = (password + salt).getBytes(); 1343 byte[] sha1 = MessageDigest.getInstance(algo = "SHA-1").digest(saltedPassword); 1344 byte[] md5 = MessageDigest.getInstance(algo = "MD5").digest(saltedPassword); 1345 hashed = toHex(sha1) + toHex(md5); 1346 } catch (NoSuchAlgorithmException e) { 1347 Log.w(LOG_TAG, "Failed to encode string because of missing algorithm: " + algo); 1348 } 1349 return hashed; 1350 } 1351 1352 private static String toHex(byte[] ary) { 1353 final String hex = "0123456789ABCDEF"; 1354 String ret = ""; 1355 for (int i = 0; i < ary.length; i++) { 1356 ret += hex.charAt((ary[i] >> 4) & 0xf); 1357 ret += hex.charAt(ary[i] & 0xf); 1358 } 1359 return ret; 1360 } 1361 1362 private int getUidForPackage(String packageName) { 1363 long ident = Binder.clearCallingIdentity(); 1364 try { 1365 return mContext.getPackageManager().getApplicationInfo(packageName, 1366 PackageManager.GET_UNINSTALLED_PACKAGES).uid; 1367 } catch (NameNotFoundException nnfe) { 1368 return -1; 1369 } finally { 1370 Binder.restoreCallingIdentity(ident); 1371 } 1372 } 1373 1374 private Bundle readApplicationRestrictionsLocked(String packageName, 1375 int userId) { 1376 final Bundle restrictions = new Bundle(); 1377 final ArrayList<String> values = new ArrayList<String>(); 1378 1379 FileInputStream fis = null; 1380 try { 1381 AtomicFile restrictionsFile = 1382 new AtomicFile(new File(Environment.getUserSystemDirectory(userId), 1383 packageToRestrictionsFileName(packageName))); 1384 fis = restrictionsFile.openRead(); 1385 XmlPullParser parser = Xml.newPullParser(); 1386 parser.setInput(fis, null); 1387 int type; 1388 while ((type = parser.next()) != XmlPullParser.START_TAG 1389 && type != XmlPullParser.END_DOCUMENT) { 1390 ; 1391 } 1392 1393 if (type != XmlPullParser.START_TAG) { 1394 Slog.e(LOG_TAG, "Unable to read restrictions file " 1395 + restrictionsFile.getBaseFile()); 1396 return restrictions; 1397 } 1398 1399 while ((type = parser.next()) != XmlPullParser.END_DOCUMENT) { 1400 if (type == XmlPullParser.START_TAG && parser.getName().equals(TAG_ENTRY)) { 1401 String key = parser.getAttributeValue(null, ATTR_KEY); 1402 String valType = parser.getAttributeValue(null, ATTR_VALUE_TYPE); 1403 String multiple = parser.getAttributeValue(null, ATTR_MULTIPLE); 1404 if (multiple != null) { 1405 int count = Integer.parseInt(multiple); 1406 while (count > 0 && (type = parser.next()) != XmlPullParser.END_DOCUMENT) { 1407 if (type == XmlPullParser.START_TAG 1408 && parser.getName().equals(TAG_VALUE)) { 1409 values.add(parser.nextText().trim()); 1410 count--; 1411 } 1412 } 1413 String [] valueStrings = new String[values.size()]; 1414 values.toArray(valueStrings); 1415 restrictions.putStringArray(key, valueStrings); 1416 } else if (ATTR_TYPE_BOOLEAN.equals(valType)) { 1417 restrictions.putBoolean(key, Boolean.parseBoolean( 1418 parser.nextText().trim())); 1419 } else { 1420 String value = parser.nextText().trim(); 1421 restrictions.putString(key, value); 1422 } 1423 } 1424 } 1425 1426 } catch (IOException ioe) { 1427 } catch (XmlPullParserException pe) { 1428 } finally { 1429 if (fis != null) { 1430 try { 1431 fis.close(); 1432 } catch (IOException e) { 1433 } 1434 } 1435 } 1436 return restrictions; 1437 } 1438 1439 private void writeApplicationRestrictionsLocked(String packageName, 1440 Bundle restrictions, int userId) { 1441 FileOutputStream fos = null; 1442 AtomicFile restrictionsFile = new AtomicFile( 1443 new File(Environment.getUserSystemDirectory(userId), 1444 packageToRestrictionsFileName(packageName))); 1445 try { 1446 fos = restrictionsFile.startWrite(); 1447 final BufferedOutputStream bos = new BufferedOutputStream(fos); 1448 1449 // XmlSerializer serializer = XmlUtils.serializerInstance(); 1450 final XmlSerializer serializer = new FastXmlSerializer(); 1451 serializer.setOutput(bos, "utf-8"); 1452 serializer.startDocument(null, true); 1453 serializer.setFeature("http://xmlpull.org/v1/doc/features.html#indent-output", true); 1454 1455 serializer.startTag(null, TAG_RESTRICTIONS); 1456 1457 for (String key : restrictions.keySet()) { 1458 Object value = restrictions.get(key); 1459 serializer.startTag(null, TAG_ENTRY); 1460 serializer.attribute(null, ATTR_KEY, key); 1461 1462 if (value instanceof Boolean) { 1463 serializer.attribute(null, ATTR_VALUE_TYPE, ATTR_TYPE_BOOLEAN); 1464 serializer.text(value.toString()); 1465 } else if (value == null || value instanceof String) { 1466 serializer.attribute(null, ATTR_VALUE_TYPE, ATTR_TYPE_STRING); 1467 serializer.text(value != null ? (String) value : ""); 1468 } else { 1469 serializer.attribute(null, ATTR_VALUE_TYPE, ATTR_TYPE_STRING_ARRAY); 1470 String[] values = (String[]) value; 1471 serializer.attribute(null, ATTR_MULTIPLE, Integer.toString(values.length)); 1472 for (String choice : values) { 1473 serializer.startTag(null, TAG_VALUE); 1474 serializer.text(choice != null ? choice : ""); 1475 serializer.endTag(null, TAG_VALUE); 1476 } 1477 } 1478 serializer.endTag(null, TAG_ENTRY); 1479 } 1480 1481 serializer.endTag(null, TAG_RESTRICTIONS); 1482 1483 serializer.endDocument(); 1484 restrictionsFile.finishWrite(fos); 1485 } catch (Exception e) { 1486 restrictionsFile.failWrite(fos); 1487 Slog.e(LOG_TAG, "Error writing application restrictions list"); 1488 } 1489 } 1490 1491 @Override 1492 public int getUserSerialNumber(int userHandle) { 1493 synchronized (mPackagesLock) { 1494 if (!exists(userHandle)) return -1; 1495 return getUserInfoLocked(userHandle).serialNumber; 1496 } 1497 } 1498 1499 @Override 1500 public int getUserHandle(int userSerialNumber) { 1501 synchronized (mPackagesLock) { 1502 for (int userId : mUserIds) { 1503 if (getUserInfoLocked(userId).serialNumber == userSerialNumber) return userId; 1504 } 1505 // Not found 1506 return -1; 1507 } 1508 } 1509 1510 /** 1511 * Caches the list of user ids in an array, adjusting the array size when necessary. 1512 */ 1513 private void updateUserIdsLocked() { 1514 int num = 0; 1515 for (int i = 0; i < mUsers.size(); i++) { 1516 if (!mUsers.valueAt(i).partial) { 1517 num++; 1518 } 1519 } 1520 final int[] newUsers = new int[num]; 1521 int n = 0; 1522 for (int i = 0; i < mUsers.size(); i++) { 1523 if (!mUsers.valueAt(i).partial) { 1524 newUsers[n++] = mUsers.keyAt(i); 1525 } 1526 } 1527 mUserIds = newUsers; 1528 } 1529 1530 /** 1531 * Make a note of the last started time of a user and do some cleanup. 1532 * @param userId the user that was just foregrounded 1533 */ 1534 public void userForeground(int userId) { 1535 synchronized (mPackagesLock) { 1536 UserInfo user = mUsers.get(userId); 1537 long now = System.currentTimeMillis(); 1538 if (user == null || user.partial) { 1539 Slog.w(LOG_TAG, "userForeground: unknown user #" + userId); 1540 return; 1541 } 1542 if (now > EPOCH_PLUS_30_YEARS) { 1543 user.lastLoggedInTime = now; 1544 writeUserLocked(user); 1545 } 1546 // If this is not a restricted profile and there is no restrictions pin, clean up 1547 // all restrictions files that might have been left behind, else clean up just the 1548 // ones with uninstalled packages 1549 RestrictionsPinState pinState = mRestrictionsPinStates.get(userId); 1550 final long salt = pinState == null ? 0 : pinState.salt; 1551 cleanAppRestrictions(userId, (!user.isRestricted() && salt == 0)); 1552 } 1553 } 1554 1555 /** 1556 * Returns the next available user id, filling in any holes in the ids. 1557 * TODO: May not be a good idea to recycle ids, in case it results in confusion 1558 * for data and battery stats collection, or unexpected cross-talk. 1559 * @return 1560 */ 1561 private int getNextAvailableIdLocked() { 1562 synchronized (mPackagesLock) { 1563 int i = MIN_USER_ID; 1564 while (i < Integer.MAX_VALUE) { 1565 if (mUsers.indexOfKey(i) < 0 && !mRemovingUserIds.get(i)) { 1566 break; 1567 } 1568 i++; 1569 } 1570 return i; 1571 } 1572 } 1573 1574 private String packageToRestrictionsFileName(String packageName) { 1575 return RESTRICTIONS_FILE_PREFIX + packageName + XML_SUFFIX; 1576 } 1577 1578 private String restrictionsFileNameToPackage(String fileName) { 1579 return fileName.substring(RESTRICTIONS_FILE_PREFIX.length(), 1580 (int) (fileName.length() - XML_SUFFIX.length())); 1581 } 1582 1583 @Override 1584 protected void dump(FileDescriptor fd, PrintWriter pw, String[] args) { 1585 if (mContext.checkCallingOrSelfPermission(android.Manifest.permission.DUMP) 1586 != PackageManager.PERMISSION_GRANTED) { 1587 pw.println("Permission Denial: can't dump UserManager from from pid=" 1588 + Binder.getCallingPid() 1589 + ", uid=" + Binder.getCallingUid() 1590 + " without permission " 1591 + android.Manifest.permission.DUMP); 1592 return; 1593 } 1594 1595 long now = System.currentTimeMillis(); 1596 StringBuilder sb = new StringBuilder(); 1597 synchronized (mPackagesLock) { 1598 pw.println("Users:"); 1599 for (int i = 0; i < mUsers.size(); i++) { 1600 UserInfo user = mUsers.valueAt(i); 1601 if (user == null) continue; 1602 pw.print(" "); pw.print(user); pw.print(" serialNo="); pw.print(user.serialNumber); 1603 if (mRemovingUserIds.get(mUsers.keyAt(i))) pw.print(" <removing> "); 1604 if (user.partial) pw.print(" <partial>"); 1605 pw.println(); 1606 pw.print(" Created: "); 1607 if (user.creationTime == 0) { 1608 pw.println("<unknown>"); 1609 } else { 1610 sb.setLength(0); 1611 TimeUtils.formatDuration(now - user.creationTime, sb); 1612 sb.append(" ago"); 1613 pw.println(sb); 1614 } 1615 pw.print(" Last logged in: "); 1616 if (user.lastLoggedInTime == 0) { 1617 pw.println("<unknown>"); 1618 } else { 1619 sb.setLength(0); 1620 TimeUtils.formatDuration(now - user.lastLoggedInTime, sb); 1621 sb.append(" ago"); 1622 pw.println(sb); 1623 } 1624 } 1625 } 1626 } 1627 1628 private PackageMonitor mUserPackageMonitor = new PackageMonitor() { 1629 @Override 1630 public void onPackageRemoved(String pkg, int uid) { 1631 final int userId = this.getChangingUserId(); 1632 // Package could be disappearing because it is being blocked, so also check if 1633 // it has been uninstalled. 1634 final boolean uninstalled = isPackageDisappearing(pkg) == PACKAGE_PERMANENT_CHANGE; 1635 if (uninstalled && userId >= 0 && !isPackageInstalled(pkg, userId)) { 1636 cleanAppRestrictionsForPackage(pkg, userId); 1637 } 1638 } 1639 }; 1640} 1641