UserManagerService.java revision 7b66ed588525d2d79ef0df8b3024bae138d8681d
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, boolean enabledOnly) { 261 if (userId != UserHandle.getCallingUserId()) { 262 checkManageUsersPermission("getting profiles related to user " + userId); 263 } 264 final long ident = Binder.clearCallingIdentity(); 265 try { 266 synchronized (mPackagesLock) { 267 return getProfilesLocked(userId, enabledOnly); 268 } 269 } finally { 270 Binder.restoreCallingIdentity(ident); 271 } 272 } 273 274 /** Assume permissions already checked and caller's identity cleared */ 275 private List<UserInfo> getProfilesLocked(int userId, boolean enabledOnly) { 276 UserInfo user = getUserInfoLocked(userId); 277 ArrayList<UserInfo> users = new ArrayList<UserInfo>(mUsers.size()); 278 for (int i = 0; i < mUsers.size(); i++) { 279 UserInfo profile = mUsers.valueAt(i); 280 if (!isProfileOf(user, profile)) { 281 continue; 282 } 283 if (enabledOnly && !profile.isEnabled()) { 284 continue; 285 } 286 users.add(profile); 287 } 288 return users; 289 } 290 291 private boolean isProfileOf(UserInfo user, UserInfo profile) { 292 return user.id == profile.id || 293 (user.profileGroupId != UserInfo.NO_PROFILE_GROUP_ID 294 && user.profileGroupId == profile.profileGroupId); 295 } 296 297 @Override 298 public void setUserEnabled(int userId) { 299 checkManageUsersPermission("enable user"); 300 synchronized (mPackagesLock) { 301 UserInfo info = getUserInfoLocked(userId); 302 if (info != null && !info.isEnabled()) { 303 info.flags ^= UserInfo.FLAG_DISABLED; 304 writeUserLocked(info); 305 } 306 } 307 } 308 309 @Override 310 public UserInfo getUserInfo(int userId) { 311 checkManageUsersPermission("query user"); 312 synchronized (mPackagesLock) { 313 return getUserInfoLocked(userId); 314 } 315 } 316 317 @Override 318 public boolean isRestricted() { 319 synchronized (mPackagesLock) { 320 return getUserInfoLocked(UserHandle.getCallingUserId()).isRestricted(); 321 } 322 } 323 324 /* 325 * Should be locked on mUsers before calling this. 326 */ 327 private UserInfo getUserInfoLocked(int userId) { 328 UserInfo ui = mUsers.get(userId); 329 // If it is partial and not in the process of being removed, return as unknown user. 330 if (ui != null && ui.partial && !mRemovingUserIds.get(userId)) { 331 Slog.w(LOG_TAG, "getUserInfo: unknown user #" + userId); 332 return null; 333 } 334 return ui; 335 } 336 337 public boolean exists(int userId) { 338 synchronized (mPackagesLock) { 339 return ArrayUtils.contains(mUserIds, userId); 340 } 341 } 342 343 @Override 344 public void setUserName(int userId, String name) { 345 checkManageUsersPermission("rename users"); 346 boolean changed = false; 347 synchronized (mPackagesLock) { 348 UserInfo info = mUsers.get(userId); 349 if (info == null || info.partial) { 350 Slog.w(LOG_TAG, "setUserName: unknown user #" + userId); 351 return; 352 } 353 if (name != null && !name.equals(info.name)) { 354 info.name = name; 355 writeUserLocked(info); 356 changed = true; 357 } 358 } 359 if (changed) { 360 sendUserInfoChangedBroadcast(userId); 361 } 362 } 363 364 @Override 365 public void setUserIcon(int userId, Bitmap bitmap) { 366 checkManageUsersPermission("update users"); 367 synchronized (mPackagesLock) { 368 UserInfo info = mUsers.get(userId); 369 if (info == null || info.partial) { 370 Slog.w(LOG_TAG, "setUserIcon: unknown user #" + userId); 371 return; 372 } 373 writeBitmapLocked(info, bitmap); 374 writeUserLocked(info); 375 } 376 sendUserInfoChangedBroadcast(userId); 377 } 378 379 private void sendUserInfoChangedBroadcast(int userId) { 380 Intent changedIntent = new Intent(Intent.ACTION_USER_INFO_CHANGED); 381 changedIntent.putExtra(Intent.EXTRA_USER_HANDLE, userId); 382 changedIntent.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY); 383 mContext.sendBroadcastAsUser(changedIntent, UserHandle.ALL); 384 } 385 386 @Override 387 public Bitmap getUserIcon(int userId) { 388 checkManageUsersPermission("read users"); 389 synchronized (mPackagesLock) { 390 UserInfo info = mUsers.get(userId); 391 if (info == null || info.partial) { 392 Slog.w(LOG_TAG, "getUserIcon: unknown user #" + userId); 393 return null; 394 } 395 if (info.iconPath == null) { 396 return null; 397 } 398 return BitmapFactory.decodeFile(info.iconPath); 399 } 400 } 401 402 @Override 403 public void setGuestEnabled(boolean enable) { 404 checkManageUsersPermission("enable guest users"); 405 synchronized (mPackagesLock) { 406 if (mGuestEnabled != enable) { 407 mGuestEnabled = enable; 408 // Erase any guest user that currently exists 409 for (int i = 0; i < mUsers.size(); i++) { 410 UserInfo user = mUsers.valueAt(i); 411 if (!user.partial && user.isGuest()) { 412 if (!enable) { 413 removeUser(user.id); 414 } 415 return; 416 } 417 } 418 // No guest was found 419 if (enable) { 420 createUser("Guest", UserInfo.FLAG_GUEST); 421 } 422 } 423 } 424 } 425 426 @Override 427 public boolean isGuestEnabled() { 428 synchronized (mPackagesLock) { 429 return mGuestEnabled; 430 } 431 } 432 433 @Override 434 public void wipeUser(int userHandle) { 435 checkManageUsersPermission("wipe user"); 436 // TODO: 437 } 438 439 public void makeInitialized(int userId) { 440 checkManageUsersPermission("makeInitialized"); 441 synchronized (mPackagesLock) { 442 UserInfo info = mUsers.get(userId); 443 if (info == null || info.partial) { 444 Slog.w(LOG_TAG, "makeInitialized: unknown user #" + userId); 445 } 446 if ((info.flags&UserInfo.FLAG_INITIALIZED) == 0) { 447 info.flags |= UserInfo.FLAG_INITIALIZED; 448 writeUserLocked(info); 449 } 450 } 451 } 452 453 @Override 454 public Bundle getUserRestrictions(int userId) { 455 // checkManageUsersPermission("getUserRestrictions"); 456 457 synchronized (mPackagesLock) { 458 Bundle restrictions = mUserRestrictions.get(userId); 459 return restrictions != null ? new Bundle(restrictions) : new Bundle(); 460 } 461 } 462 463 @Override 464 public void setUserRestrictions(Bundle restrictions, int userId) { 465 checkManageUsersPermission("setUserRestrictions"); 466 if (restrictions == null) return; 467 468 synchronized (mPackagesLock) { 469 mUserRestrictions.get(userId).clear(); 470 mUserRestrictions.get(userId).putAll(restrictions); 471 writeUserLocked(mUsers.get(userId)); 472 } 473 } 474 475 /** 476 * Check if we've hit the limit of how many users can be created. 477 */ 478 private boolean isUserLimitReachedLocked() { 479 int nUsers = mUsers.size(); 480 return nUsers >= UserManager.getMaxSupportedUsers(); 481 } 482 483 /** 484 * Enforces that only the system UID or root's UID or apps that have the 485 * {@link android.Manifest.permission#MANAGE_USERS MANAGE_USERS} 486 * permission can make certain calls to the UserManager. 487 * 488 * @param message used as message if SecurityException is thrown 489 * @throws SecurityException if the caller is not system or root 490 */ 491 private static final void checkManageUsersPermission(String message) { 492 final int uid = Binder.getCallingUid(); 493 if (uid != Process.SYSTEM_UID && uid != 0 494 && ActivityManager.checkComponentPermission( 495 android.Manifest.permission.MANAGE_USERS, 496 uid, -1, true) != PackageManager.PERMISSION_GRANTED) { 497 throw new SecurityException("You need MANAGE_USERS permission to: " + message); 498 } 499 } 500 501 private void writeBitmapLocked(UserInfo info, Bitmap bitmap) { 502 try { 503 File dir = new File(mUsersDir, Integer.toString(info.id)); 504 File file = new File(dir, USER_PHOTO_FILENAME); 505 if (!dir.exists()) { 506 dir.mkdir(); 507 FileUtils.setPermissions( 508 dir.getPath(), 509 FileUtils.S_IRWXU|FileUtils.S_IRWXG|FileUtils.S_IXOTH, 510 -1, -1); 511 } 512 FileOutputStream os; 513 if (bitmap.compress(Bitmap.CompressFormat.PNG, 100, os = new FileOutputStream(file))) { 514 info.iconPath = file.getAbsolutePath(); 515 } 516 try { 517 os.close(); 518 } catch (IOException ioe) { 519 // What the ... ! 520 } 521 } catch (FileNotFoundException e) { 522 Slog.w(LOG_TAG, "Error setting photo for user ", e); 523 } 524 } 525 526 /** 527 * Returns an array of user ids. This array is cached here for quick access, so do not modify or 528 * cache it elsewhere. 529 * @return the array of user ids. 530 */ 531 public int[] getUserIds() { 532 synchronized (mPackagesLock) { 533 return mUserIds; 534 } 535 } 536 537 int[] getUserIdsLPr() { 538 return mUserIds; 539 } 540 541 private void readUserListLocked() { 542 mGuestEnabled = false; 543 if (!mUserListFile.exists()) { 544 fallbackToSingleUserLocked(); 545 return; 546 } 547 FileInputStream fis = null; 548 AtomicFile userListFile = new AtomicFile(mUserListFile); 549 try { 550 fis = userListFile.openRead(); 551 XmlPullParser parser = Xml.newPullParser(); 552 parser.setInput(fis, null); 553 int type; 554 while ((type = parser.next()) != XmlPullParser.START_TAG 555 && type != XmlPullParser.END_DOCUMENT) { 556 ; 557 } 558 559 if (type != XmlPullParser.START_TAG) { 560 Slog.e(LOG_TAG, "Unable to read user list"); 561 fallbackToSingleUserLocked(); 562 return; 563 } 564 565 mNextSerialNumber = -1; 566 if (parser.getName().equals(TAG_USERS)) { 567 String lastSerialNumber = parser.getAttributeValue(null, ATTR_NEXT_SERIAL_NO); 568 if (lastSerialNumber != null) { 569 mNextSerialNumber = Integer.parseInt(lastSerialNumber); 570 } 571 String versionNumber = parser.getAttributeValue(null, ATTR_USER_VERSION); 572 if (versionNumber != null) { 573 mUserVersion = Integer.parseInt(versionNumber); 574 } 575 } 576 577 while ((type = parser.next()) != XmlPullParser.END_DOCUMENT) { 578 if (type == XmlPullParser.START_TAG && parser.getName().equals(TAG_USER)) { 579 String id = parser.getAttributeValue(null, ATTR_ID); 580 UserInfo user = readUserLocked(Integer.parseInt(id)); 581 582 if (user != null) { 583 mUsers.put(user.id, user); 584 if (user.isGuest()) { 585 mGuestEnabled = true; 586 } 587 if (mNextSerialNumber < 0 || mNextSerialNumber <= user.id) { 588 mNextSerialNumber = user.id + 1; 589 } 590 } 591 } 592 } 593 updateUserIdsLocked(); 594 upgradeIfNecessaryLocked(); 595 } catch (IOException ioe) { 596 fallbackToSingleUserLocked(); 597 } catch (XmlPullParserException pe) { 598 fallbackToSingleUserLocked(); 599 } finally { 600 if (fis != null) { 601 try { 602 fis.close(); 603 } catch (IOException e) { 604 } 605 } 606 } 607 } 608 609 /** 610 * Upgrade steps between versions, either for fixing bugs or changing the data format. 611 */ 612 private void upgradeIfNecessaryLocked() { 613 int userVersion = mUserVersion; 614 if (userVersion < 1) { 615 // Assign a proper name for the owner, if not initialized correctly before 616 UserInfo user = mUsers.get(UserHandle.USER_OWNER); 617 if ("Primary".equals(user.name)) { 618 user.name = mContext.getResources().getString(com.android.internal.R.string.owner_name); 619 writeUserLocked(user); 620 } 621 userVersion = 1; 622 } 623 624 if (userVersion < 2) { 625 // Owner should be marked as initialized 626 UserInfo user = mUsers.get(UserHandle.USER_OWNER); 627 if ((user.flags & UserInfo.FLAG_INITIALIZED) == 0) { 628 user.flags |= UserInfo.FLAG_INITIALIZED; 629 writeUserLocked(user); 630 } 631 userVersion = 2; 632 } 633 634 635 if (userVersion < 4) { 636 userVersion = 4; 637 } 638 639 if (userVersion < USER_VERSION) { 640 Slog.w(LOG_TAG, "User version " + mUserVersion + " didn't upgrade as expected to " 641 + USER_VERSION); 642 } else { 643 mUserVersion = userVersion; 644 writeUserListLocked(); 645 } 646 } 647 648 private void fallbackToSingleUserLocked() { 649 // Create the primary user 650 UserInfo primary = new UserInfo(UserHandle.USER_OWNER, 651 mContext.getResources().getString(com.android.internal.R.string.owner_name), null, 652 UserInfo.FLAG_ADMIN | UserInfo.FLAG_PRIMARY | UserInfo.FLAG_INITIALIZED); 653 mUsers.put(0, primary); 654 mNextSerialNumber = MIN_USER_ID; 655 mUserVersion = USER_VERSION; 656 657 Bundle restrictions = new Bundle(); 658 mUserRestrictions.append(UserHandle.USER_OWNER, restrictions); 659 660 updateUserIdsLocked(); 661 662 writeUserListLocked(); 663 writeUserLocked(primary); 664 } 665 666 /* 667 * Writes the user file in this format: 668 * 669 * <user flags="20039023" id="0"> 670 * <name>Primary</name> 671 * </user> 672 */ 673 private void writeUserLocked(UserInfo userInfo) { 674 FileOutputStream fos = null; 675 AtomicFile userFile = new AtomicFile(new File(mUsersDir, userInfo.id + XML_SUFFIX)); 676 try { 677 fos = userFile.startWrite(); 678 final BufferedOutputStream bos = new BufferedOutputStream(fos); 679 680 // XmlSerializer serializer = XmlUtils.serializerInstance(); 681 final XmlSerializer serializer = new FastXmlSerializer(); 682 serializer.setOutput(bos, "utf-8"); 683 serializer.startDocument(null, true); 684 serializer.setFeature("http://xmlpull.org/v1/doc/features.html#indent-output", true); 685 686 serializer.startTag(null, TAG_USER); 687 serializer.attribute(null, ATTR_ID, Integer.toString(userInfo.id)); 688 serializer.attribute(null, ATTR_SERIAL_NO, Integer.toString(userInfo.serialNumber)); 689 serializer.attribute(null, ATTR_FLAGS, Integer.toString(userInfo.flags)); 690 serializer.attribute(null, ATTR_CREATION_TIME, Long.toString(userInfo.creationTime)); 691 serializer.attribute(null, ATTR_LAST_LOGGED_IN_TIME, 692 Long.toString(userInfo.lastLoggedInTime)); 693 RestrictionsPinState pinState = mRestrictionsPinStates.get(userInfo.id); 694 if (pinState != null) { 695 if (pinState.salt != 0) { 696 serializer.attribute(null, ATTR_SALT, Long.toString(pinState.salt)); 697 } 698 if (pinState.pinHash != null) { 699 serializer.attribute(null, ATTR_PIN_HASH, pinState.pinHash); 700 } 701 if (pinState.failedAttempts != 0) { 702 serializer.attribute(null, ATTR_FAILED_ATTEMPTS, 703 Integer.toString(pinState.failedAttempts)); 704 serializer.attribute(null, ATTR_LAST_RETRY_MS, 705 Long.toString(pinState.lastAttemptTime)); 706 } 707 } 708 if (userInfo.iconPath != null) { 709 serializer.attribute(null, ATTR_ICON_PATH, userInfo.iconPath); 710 } 711 if (userInfo.partial) { 712 serializer.attribute(null, ATTR_PARTIAL, "true"); 713 } 714 if (userInfo.profileGroupId != UserInfo.NO_PROFILE_GROUP_ID) { 715 serializer.attribute(null, ATTR_PROFILE_GROUP_ID, 716 Integer.toString(userInfo.profileGroupId)); 717 } 718 719 serializer.startTag(null, TAG_NAME); 720 serializer.text(userInfo.name); 721 serializer.endTag(null, TAG_NAME); 722 723 Bundle restrictions = mUserRestrictions.get(userInfo.id); 724 if (restrictions != null) { 725 serializer.startTag(null, TAG_RESTRICTIONS); 726 writeBoolean(serializer, restrictions, UserManager.DISALLOW_CONFIG_WIFI); 727 writeBoolean(serializer, restrictions, UserManager.DISALLOW_MODIFY_ACCOUNTS); 728 writeBoolean(serializer, restrictions, UserManager.DISALLOW_INSTALL_APPS); 729 writeBoolean(serializer, restrictions, UserManager.DISALLOW_UNINSTALL_APPS); 730 writeBoolean(serializer, restrictions, UserManager.DISALLOW_SHARE_LOCATION); 731 writeBoolean(serializer, restrictions, 732 UserManager.DISALLOW_INSTALL_UNKNOWN_SOURCES); 733 writeBoolean(serializer, restrictions, UserManager.DISALLOW_CONFIG_BLUETOOTH); 734 writeBoolean(serializer, restrictions, UserManager.DISALLOW_USB_FILE_TRANSFER); 735 writeBoolean(serializer, restrictions, UserManager.DISALLOW_CONFIG_CREDENTIALS); 736 writeBoolean(serializer, restrictions, UserManager.DISALLOW_REMOVE_USER); 737 serializer.endTag(null, TAG_RESTRICTIONS); 738 } 739 serializer.endTag(null, TAG_USER); 740 741 serializer.endDocument(); 742 userFile.finishWrite(fos); 743 } catch (Exception ioe) { 744 Slog.e(LOG_TAG, "Error writing user info " + userInfo.id + "\n" + ioe); 745 userFile.failWrite(fos); 746 } 747 } 748 749 /* 750 * Writes the user list file in this format: 751 * 752 * <users nextSerialNumber="3"> 753 * <user id="0"></user> 754 * <user id="2"></user> 755 * </users> 756 */ 757 private void writeUserListLocked() { 758 FileOutputStream fos = null; 759 AtomicFile userListFile = new AtomicFile(mUserListFile); 760 try { 761 fos = userListFile.startWrite(); 762 final BufferedOutputStream bos = new BufferedOutputStream(fos); 763 764 // XmlSerializer serializer = XmlUtils.serializerInstance(); 765 final XmlSerializer serializer = new FastXmlSerializer(); 766 serializer.setOutput(bos, "utf-8"); 767 serializer.startDocument(null, true); 768 serializer.setFeature("http://xmlpull.org/v1/doc/features.html#indent-output", true); 769 770 serializer.startTag(null, TAG_USERS); 771 serializer.attribute(null, ATTR_NEXT_SERIAL_NO, Integer.toString(mNextSerialNumber)); 772 serializer.attribute(null, ATTR_USER_VERSION, Integer.toString(mUserVersion)); 773 774 for (int i = 0; i < mUsers.size(); i++) { 775 UserInfo user = mUsers.valueAt(i); 776 serializer.startTag(null, TAG_USER); 777 serializer.attribute(null, ATTR_ID, Integer.toString(user.id)); 778 serializer.endTag(null, TAG_USER); 779 } 780 781 serializer.endTag(null, TAG_USERS); 782 783 serializer.endDocument(); 784 userListFile.finishWrite(fos); 785 } catch (Exception e) { 786 userListFile.failWrite(fos); 787 Slog.e(LOG_TAG, "Error writing user list"); 788 } 789 } 790 791 private UserInfo readUserLocked(int id) { 792 int flags = 0; 793 int serialNumber = id; 794 String name = null; 795 String iconPath = null; 796 long creationTime = 0L; 797 long lastLoggedInTime = 0L; 798 long salt = 0L; 799 String pinHash = null; 800 int failedAttempts = 0; 801 int profileGroupId = UserInfo.NO_PROFILE_GROUP_ID; 802 long lastAttemptTime = 0L; 803 boolean partial = false; 804 Bundle restrictions = new Bundle(); 805 806 FileInputStream fis = null; 807 try { 808 AtomicFile userFile = 809 new AtomicFile(new File(mUsersDir, Integer.toString(id) + XML_SUFFIX)); 810 fis = userFile.openRead(); 811 XmlPullParser parser = Xml.newPullParser(); 812 parser.setInput(fis, null); 813 int type; 814 while ((type = parser.next()) != XmlPullParser.START_TAG 815 && type != XmlPullParser.END_DOCUMENT) { 816 ; 817 } 818 819 if (type != XmlPullParser.START_TAG) { 820 Slog.e(LOG_TAG, "Unable to read user " + id); 821 return null; 822 } 823 824 if (type == XmlPullParser.START_TAG && parser.getName().equals(TAG_USER)) { 825 int storedId = readIntAttribute(parser, ATTR_ID, -1); 826 if (storedId != id) { 827 Slog.e(LOG_TAG, "User id does not match the file name"); 828 return null; 829 } 830 serialNumber = readIntAttribute(parser, ATTR_SERIAL_NO, id); 831 flags = readIntAttribute(parser, ATTR_FLAGS, 0); 832 iconPath = parser.getAttributeValue(null, ATTR_ICON_PATH); 833 creationTime = readLongAttribute(parser, ATTR_CREATION_TIME, 0); 834 lastLoggedInTime = readLongAttribute(parser, ATTR_LAST_LOGGED_IN_TIME, 0); 835 salt = readLongAttribute(parser, ATTR_SALT, 0L); 836 pinHash = parser.getAttributeValue(null, ATTR_PIN_HASH); 837 failedAttempts = readIntAttribute(parser, ATTR_FAILED_ATTEMPTS, 0); 838 lastAttemptTime = readLongAttribute(parser, ATTR_LAST_RETRY_MS, 0L); 839 profileGroupId = readIntAttribute(parser, ATTR_PROFILE_GROUP_ID, 840 UserInfo.NO_PROFILE_GROUP_ID); 841 if (profileGroupId == UserInfo.NO_PROFILE_GROUP_ID) { 842 // This attribute was added and renamed during development of L. 843 // TODO Remove upgrade path by 1st May 2014 844 profileGroupId = readIntAttribute(parser, "relatedGroupId", 845 UserInfo.NO_PROFILE_GROUP_ID); 846 } 847 String valueString = parser.getAttributeValue(null, ATTR_PARTIAL); 848 if ("true".equals(valueString)) { 849 partial = true; 850 } 851 852 int outerDepth = parser.getDepth(); 853 while ((type = parser.next()) != XmlPullParser.END_DOCUMENT 854 && (type != XmlPullParser.END_TAG || parser.getDepth() > outerDepth)) { 855 if (type == XmlPullParser.END_TAG || type == XmlPullParser.TEXT) { 856 continue; 857 } 858 String tag = parser.getName(); 859 if (TAG_NAME.equals(tag)) { 860 type = parser.next(); 861 if (type == XmlPullParser.TEXT) { 862 name = parser.getText(); 863 } 864 } else if (TAG_RESTRICTIONS.equals(tag)) { 865 readBoolean(parser, restrictions, UserManager.DISALLOW_CONFIG_WIFI); 866 readBoolean(parser, restrictions, UserManager.DISALLOW_MODIFY_ACCOUNTS); 867 readBoolean(parser, restrictions, UserManager.DISALLOW_INSTALL_APPS); 868 readBoolean(parser, restrictions, UserManager.DISALLOW_UNINSTALL_APPS); 869 readBoolean(parser, restrictions, UserManager.DISALLOW_SHARE_LOCATION); 870 readBoolean(parser, restrictions, 871 UserManager.DISALLOW_INSTALL_UNKNOWN_SOURCES); 872 readBoolean(parser, restrictions, UserManager.DISALLOW_CONFIG_BLUETOOTH); 873 readBoolean(parser, restrictions, UserManager.DISALLOW_USB_FILE_TRANSFER); 874 readBoolean(parser, restrictions, UserManager.DISALLOW_CONFIG_CREDENTIALS); 875 readBoolean(parser, restrictions, UserManager.DISALLOW_REMOVE_USER); 876 } 877 } 878 } 879 880 UserInfo userInfo = new UserInfo(id, name, iconPath, flags); 881 userInfo.serialNumber = serialNumber; 882 userInfo.creationTime = creationTime; 883 userInfo.lastLoggedInTime = lastLoggedInTime; 884 userInfo.partial = partial; 885 userInfo.profileGroupId = profileGroupId; 886 mUserRestrictions.append(id, restrictions); 887 if (salt != 0L) { 888 RestrictionsPinState pinState = mRestrictionsPinStates.get(id); 889 if (pinState == null) { 890 pinState = new RestrictionsPinState(); 891 mRestrictionsPinStates.put(id, pinState); 892 } 893 pinState.salt = salt; 894 pinState.pinHash = pinHash; 895 pinState.failedAttempts = failedAttempts; 896 pinState.lastAttemptTime = lastAttemptTime; 897 } 898 return userInfo; 899 900 } catch (IOException ioe) { 901 } catch (XmlPullParserException pe) { 902 } finally { 903 if (fis != null) { 904 try { 905 fis.close(); 906 } catch (IOException e) { 907 } 908 } 909 } 910 return null; 911 } 912 913 private void readBoolean(XmlPullParser parser, Bundle restrictions, 914 String restrictionKey) { 915 String value = parser.getAttributeValue(null, restrictionKey); 916 if (value != null) { 917 restrictions.putBoolean(restrictionKey, Boolean.parseBoolean(value)); 918 } 919 } 920 921 private void writeBoolean(XmlSerializer xml, Bundle restrictions, String restrictionKey) 922 throws IOException { 923 if (restrictions.containsKey(restrictionKey)) { 924 xml.attribute(null, restrictionKey, 925 Boolean.toString(restrictions.getBoolean(restrictionKey))); 926 } 927 } 928 929 private int readIntAttribute(XmlPullParser parser, String attr, int defaultValue) { 930 String valueString = parser.getAttributeValue(null, attr); 931 if (valueString == null) return defaultValue; 932 try { 933 return Integer.parseInt(valueString); 934 } catch (NumberFormatException nfe) { 935 return defaultValue; 936 } 937 } 938 939 private long readLongAttribute(XmlPullParser parser, String attr, long defaultValue) { 940 String valueString = parser.getAttributeValue(null, attr); 941 if (valueString == null) return defaultValue; 942 try { 943 return Long.parseLong(valueString); 944 } catch (NumberFormatException nfe) { 945 return defaultValue; 946 } 947 } 948 949 private boolean isPackageInstalled(String pkg, int userId) { 950 final ApplicationInfo info = mPm.getApplicationInfo(pkg, 951 PackageManager.GET_UNINSTALLED_PACKAGES, 952 userId); 953 if (info == null || (info.flags&ApplicationInfo.FLAG_INSTALLED) == 0) { 954 return false; 955 } 956 return true; 957 } 958 959 /** 960 * Removes all the restrictions files (res_<packagename>) for a given user, if all is true, 961 * else removes only those packages that have been uninstalled. 962 * Does not do any permissions checking. 963 */ 964 private void cleanAppRestrictions(int userId, boolean all) { 965 synchronized (mPackagesLock) { 966 File dir = Environment.getUserSystemDirectory(userId); 967 String[] files = dir.list(); 968 if (files == null) return; 969 for (String fileName : files) { 970 if (fileName.startsWith(RESTRICTIONS_FILE_PREFIX)) { 971 File resFile = new File(dir, fileName); 972 if (resFile.exists()) { 973 if (all) { 974 resFile.delete(); 975 } else { 976 String pkg = restrictionsFileNameToPackage(fileName); 977 if (!isPackageInstalled(pkg, userId)) { 978 resFile.delete(); 979 } 980 } 981 } 982 } 983 } 984 } 985 } 986 987 /** 988 * Removes the app restrictions file for a specific package and user id, if it exists. 989 */ 990 private void cleanAppRestrictionsForPackage(String pkg, int userId) { 991 synchronized (mPackagesLock) { 992 File dir = Environment.getUserSystemDirectory(userId); 993 File resFile = new File(dir, packageToRestrictionsFileName(pkg)); 994 if (resFile.exists()) { 995 resFile.delete(); 996 } 997 } 998 } 999 1000 private int getNextProfileGroupIdLocked() { 1001 int maxGroupId = UserInfo.NO_PROFILE_GROUP_ID; 1002 for (int i = 0; i < mUsers.size(); i++) { 1003 UserInfo ui = mUsers.valueAt(i); 1004 if (maxGroupId < ui.profileGroupId) { 1005 maxGroupId = ui.profileGroupId; 1006 } 1007 } 1008 return maxGroupId + 1; 1009 } 1010 1011 @Override 1012 public UserInfo createProfileForUser(String name, int flags, int userId) { 1013 checkManageUsersPermission("Only the system can create users"); 1014 if (userId != UserHandle.USER_OWNER) { 1015 Slog.w(LOG_TAG, "Only user owner can have profiles"); 1016 return null; 1017 } 1018 return createUserInternal(name, flags, userId); 1019 } 1020 1021 @Override 1022 public UserInfo createUser(String name, int flags) { 1023 checkManageUsersPermission("Only the system can create users"); 1024 return createUserInternal(name, flags, UserHandle.USER_NULL); 1025 } 1026 1027 private UserInfo createUserInternal(String name, int flags, int profileId) { 1028 final long ident = Binder.clearCallingIdentity(); 1029 UserInfo userInfo = null; 1030 try { 1031 synchronized (mInstallLock) { 1032 synchronized (mPackagesLock) { 1033 UserInfo profile = null; 1034 if (profileId != UserHandle.USER_NULL) { 1035 profile = getUserInfoLocked(profileId); 1036 if (profile == null) return null; 1037 } 1038 if (isUserLimitReachedLocked()) return null; 1039 int userId = getNextAvailableIdLocked(); 1040 userInfo = new UserInfo(userId, name, null, flags); 1041 File userPath = new File(mBaseUserPath, Integer.toString(userId)); 1042 userInfo.serialNumber = mNextSerialNumber++; 1043 long now = System.currentTimeMillis(); 1044 userInfo.creationTime = (now > EPOCH_PLUS_30_YEARS) ? now : 0; 1045 userInfo.partial = true; 1046 Environment.getUserSystemDirectory(userInfo.id).mkdirs(); 1047 mUsers.put(userId, userInfo); 1048 writeUserListLocked(); 1049 if (profile != null) { 1050 if (profile.profileGroupId == UserInfo.NO_PROFILE_GROUP_ID) { 1051 profile.profileGroupId = getNextProfileGroupIdLocked(); 1052 writeUserLocked(profile); 1053 } 1054 userInfo.profileGroupId = profile.profileGroupId; 1055 } 1056 writeUserLocked(userInfo); 1057 mPm.createNewUserLILPw(userId, userPath); 1058 userInfo.partial = false; 1059 writeUserLocked(userInfo); 1060 updateUserIdsLocked(); 1061 Bundle restrictions = new Bundle(); 1062 mUserRestrictions.append(userId, restrictions); 1063 } 1064 } 1065 if (userInfo != null) { 1066 Intent addedIntent = new Intent(Intent.ACTION_USER_ADDED); 1067 addedIntent.putExtra(Intent.EXTRA_USER_HANDLE, userInfo.id); 1068 mContext.sendBroadcastAsUser(addedIntent, UserHandle.ALL, 1069 android.Manifest.permission.MANAGE_USERS); 1070 } 1071 } finally { 1072 Binder.restoreCallingIdentity(ident); 1073 } 1074 return userInfo; 1075 } 1076 1077 /** 1078 * Removes a user and all data directories created for that user. This method should be called 1079 * after the user's processes have been terminated. 1080 * @param userHandle the user's id 1081 */ 1082 public boolean removeUser(int userHandle) { 1083 checkManageUsersPermission("Only the system can remove users"); 1084 final UserInfo user; 1085 synchronized (mPackagesLock) { 1086 user = mUsers.get(userHandle); 1087 if (userHandle == 0 || user == null) { 1088 return false; 1089 } 1090 mRemovingUserIds.put(userHandle, true); 1091 // Set this to a partially created user, so that the user will be purged 1092 // on next startup, in case the runtime stops now before stopping and 1093 // removing the user completely. 1094 user.partial = true; 1095 // Mark it as disabled, so that it isn't returned any more when 1096 // profiles are queried. 1097 user.flags |= UserInfo.FLAG_DISABLED; 1098 writeUserLocked(user); 1099 } 1100 if (DBG) Slog.i(LOG_TAG, "Stopping user " + userHandle); 1101 int res; 1102 try { 1103 res = ActivityManagerNative.getDefault().stopUser(userHandle, 1104 new IStopUserCallback.Stub() { 1105 @Override 1106 public void userStopped(int userId) { 1107 finishRemoveUser(userId); 1108 } 1109 @Override 1110 public void userStopAborted(int userId) { 1111 } 1112 }); 1113 } catch (RemoteException e) { 1114 return false; 1115 } 1116 1117 return res == ActivityManager.USER_OP_SUCCESS; 1118 } 1119 1120 void finishRemoveUser(final int userHandle) { 1121 if (DBG) Slog.i(LOG_TAG, "finishRemoveUser " + userHandle); 1122 // Let other services shutdown any activity and clean up their state before completely 1123 // wiping the user's system directory and removing from the user list 1124 long ident = Binder.clearCallingIdentity(); 1125 try { 1126 final boolean isManaged = getUserInfo(userHandle).isManagedProfile(); 1127 Intent addedIntent = new Intent(Intent.ACTION_USER_REMOVED); 1128 addedIntent.putExtra(Intent.EXTRA_USER_HANDLE, userHandle); 1129 mContext.sendOrderedBroadcastAsUser(addedIntent, UserHandle.ALL, 1130 android.Manifest.permission.MANAGE_USERS, 1131 1132 new BroadcastReceiver() { 1133 @Override 1134 public void onReceive(Context context, Intent intent) { 1135 if (DBG) { 1136 Slog.i(LOG_TAG, 1137 "USER_REMOVED broadcast sent, cleaning up user data " 1138 + userHandle); 1139 } 1140 new Thread() { 1141 public void run() { 1142 synchronized (mInstallLock) { 1143 synchronized (mPackagesLock) { 1144 removeUserStateLocked(userHandle); 1145 } 1146 } 1147 // Send broadcast to notify system that the user removed was a 1148 // managed user. 1149 if (isManaged) { 1150 sendProfileRemovedBroadcast(userHandle); 1151 } 1152 } 1153 }.start(); 1154 } 1155 }, 1156 1157 null, Activity.RESULT_OK, null, null); 1158 } finally { 1159 Binder.restoreCallingIdentity(ident); 1160 } 1161 } 1162 1163 private void removeUserStateLocked(final int userHandle) { 1164 // Cleanup package manager settings 1165 mPm.cleanUpUserLILPw(userHandle); 1166 1167 // Remove this user from the list 1168 mUsers.remove(userHandle); 1169 1170 // Have user ID linger for several seconds to let external storage VFS 1171 // cache entries expire. This must be greater than the 'entry_valid' 1172 // timeout used by the FUSE daemon. 1173 mHandler.postDelayed(new Runnable() { 1174 @Override 1175 public void run() { 1176 synchronized (mPackagesLock) { 1177 mRemovingUserIds.delete(userHandle); 1178 } 1179 } 1180 }, MINUTE_IN_MILLIS); 1181 1182 mRestrictionsPinStates.remove(userHandle); 1183 // Remove user file 1184 AtomicFile userFile = new AtomicFile(new File(mUsersDir, userHandle + XML_SUFFIX)); 1185 userFile.delete(); 1186 // Update the user list 1187 writeUserListLocked(); 1188 updateUserIdsLocked(); 1189 removeDirectoryRecursive(Environment.getUserSystemDirectory(userHandle)); 1190 } 1191 1192 private void removeDirectoryRecursive(File parent) { 1193 if (parent.isDirectory()) { 1194 String[] files = parent.list(); 1195 for (String filename : files) { 1196 File child = new File(parent, filename); 1197 removeDirectoryRecursive(child); 1198 } 1199 } 1200 parent.delete(); 1201 } 1202 1203 private void sendProfileRemovedBroadcast(int userHandle) { 1204 Intent managedProfileIntent = new Intent(Intent.ACTION_MANAGED_PROFILE_REMOVED); 1205 managedProfileIntent.putExtra(Intent.EXTRA_USER, new UserHandle(userHandle)); 1206 // Note: This makes an assumption that the parent owner is user 0. 1207 mContext.sendBroadcastAsUser(managedProfileIntent, UserHandle.OWNER, null); 1208 } 1209 1210 @Override 1211 public Bundle getApplicationRestrictions(String packageName) { 1212 return getApplicationRestrictionsForUser(packageName, UserHandle.getCallingUserId()); 1213 } 1214 1215 @Override 1216 public Bundle getApplicationRestrictionsForUser(String packageName, int userId) { 1217 if (UserHandle.getCallingUserId() != userId 1218 || !UserHandle.isSameApp(Binder.getCallingUid(), getUidForPackage(packageName))) { 1219 checkManageUsersPermission("Only system can get restrictions for other users/apps"); 1220 } 1221 synchronized (mPackagesLock) { 1222 // Read the restrictions from XML 1223 return readApplicationRestrictionsLocked(packageName, userId); 1224 } 1225 } 1226 1227 @Override 1228 public void setApplicationRestrictions(String packageName, Bundle restrictions, 1229 int userId) { 1230 if (UserHandle.getCallingUserId() != userId 1231 || !UserHandle.isSameApp(Binder.getCallingUid(), getUidForPackage(packageName))) { 1232 checkManageUsersPermission("Only system can set restrictions for other users/apps"); 1233 } 1234 synchronized (mPackagesLock) { 1235 // Write the restrictions to XML 1236 writeApplicationRestrictionsLocked(packageName, restrictions, userId); 1237 } 1238 1239 // Notify package of changes via an intent - only sent to explicitly registered receivers. 1240 Intent changeIntent = new Intent(Intent.ACTION_APPLICATION_RESTRICTIONS_CHANGED); 1241 changeIntent.setPackage(packageName); 1242 changeIntent.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY); 1243 mContext.sendBroadcastAsUser(changeIntent, new UserHandle(userId)); 1244 } 1245 1246 @Override 1247 public boolean setRestrictionsChallenge(String newPin) { 1248 checkManageUsersPermission("Only system can modify the restrictions pin"); 1249 int userId = UserHandle.getCallingUserId(); 1250 synchronized (mPackagesLock) { 1251 RestrictionsPinState pinState = mRestrictionsPinStates.get(userId); 1252 if (pinState == null) { 1253 pinState = new RestrictionsPinState(); 1254 } 1255 if (newPin == null) { 1256 pinState.salt = 0; 1257 pinState.pinHash = null; 1258 } else { 1259 try { 1260 pinState.salt = SecureRandom.getInstance("SHA1PRNG").nextLong(); 1261 } catch (NoSuchAlgorithmException e) { 1262 pinState.salt = (long) (Math.random() * Long.MAX_VALUE); 1263 } 1264 pinState.pinHash = passwordToHash(newPin, pinState.salt); 1265 pinState.failedAttempts = 0; 1266 } 1267 mRestrictionsPinStates.put(userId, pinState); 1268 writeUserLocked(mUsers.get(userId)); 1269 } 1270 return true; 1271 } 1272 1273 @Override 1274 public int checkRestrictionsChallenge(String pin) { 1275 checkManageUsersPermission("Only system can verify the restrictions pin"); 1276 int userId = UserHandle.getCallingUserId(); 1277 synchronized (mPackagesLock) { 1278 RestrictionsPinState pinState = mRestrictionsPinStates.get(userId); 1279 // If there's no pin set, return error code 1280 if (pinState == null || pinState.salt == 0 || pinState.pinHash == null) { 1281 return UserManager.PIN_VERIFICATION_FAILED_NOT_SET; 1282 } else if (pin == null) { 1283 // If just checking if user can be prompted, return remaining time 1284 int waitTime = getRemainingTimeForPinAttempt(pinState); 1285 Slog.d(LOG_TAG, "Remaining waittime peek=" + waitTime); 1286 return waitTime; 1287 } else { 1288 int waitTime = getRemainingTimeForPinAttempt(pinState); 1289 Slog.d(LOG_TAG, "Remaining waittime=" + waitTime); 1290 if (waitTime > 0) { 1291 return waitTime; 1292 } 1293 if (passwordToHash(pin, pinState.salt).equals(pinState.pinHash)) { 1294 pinState.failedAttempts = 0; 1295 writeUserLocked(mUsers.get(userId)); 1296 return UserManager.PIN_VERIFICATION_SUCCESS; 1297 } else { 1298 pinState.failedAttempts++; 1299 pinState.lastAttemptTime = System.currentTimeMillis(); 1300 writeUserLocked(mUsers.get(userId)); 1301 return waitTime; 1302 } 1303 } 1304 } 1305 } 1306 1307 private int getRemainingTimeForPinAttempt(RestrictionsPinState pinState) { 1308 int backoffIndex = Math.min(pinState.failedAttempts / BACKOFF_INC_INTERVAL, 1309 BACKOFF_TIMES.length - 1); 1310 int backoffTime = (pinState.failedAttempts % BACKOFF_INC_INTERVAL) == 0 ? 1311 BACKOFF_TIMES[backoffIndex] : 0; 1312 return (int) Math.max(backoffTime + pinState.lastAttemptTime - System.currentTimeMillis(), 1313 0); 1314 } 1315 1316 @Override 1317 public boolean hasRestrictionsChallenge() { 1318 int userId = UserHandle.getCallingUserId(); 1319 synchronized (mPackagesLock) { 1320 return hasRestrictionsPinLocked(userId); 1321 } 1322 } 1323 1324 private boolean hasRestrictionsPinLocked(int userId) { 1325 RestrictionsPinState pinState = mRestrictionsPinStates.get(userId); 1326 if (pinState == null || pinState.salt == 0 || pinState.pinHash == null) { 1327 return false; 1328 } 1329 return true; 1330 } 1331 1332 @Override 1333 public void removeRestrictions() { 1334 checkManageUsersPermission("Only system can remove restrictions"); 1335 final int userHandle = UserHandle.getCallingUserId(); 1336 removeRestrictionsForUser(userHandle, true); 1337 } 1338 1339 private void removeRestrictionsForUser(final int userHandle, boolean unblockApps) { 1340 synchronized (mPackagesLock) { 1341 // Remove all user restrictions 1342 setUserRestrictions(new Bundle(), userHandle); 1343 // Remove restrictions pin 1344 setRestrictionsChallenge(null); 1345 // Remove any app restrictions 1346 cleanAppRestrictions(userHandle, true); 1347 } 1348 if (unblockApps) { 1349 unblockAllAppsForUser(userHandle); 1350 } 1351 } 1352 1353 private void unblockAllAppsForUser(final int userHandle) { 1354 mHandler.post(new Runnable() { 1355 @Override 1356 public void run() { 1357 List<ApplicationInfo> apps = 1358 mPm.getInstalledApplications(PackageManager.GET_UNINSTALLED_PACKAGES, 1359 userHandle).getList(); 1360 final long ident = Binder.clearCallingIdentity(); 1361 try { 1362 for (ApplicationInfo appInfo : apps) { 1363 if ((appInfo.flags & ApplicationInfo.FLAG_INSTALLED) != 0 1364 && (appInfo.flags & ApplicationInfo.FLAG_BLOCKED) != 0) { 1365 mPm.setApplicationBlockedSettingAsUser(appInfo.packageName, false, 1366 userHandle); 1367 } 1368 } 1369 } finally { 1370 Binder.restoreCallingIdentity(ident); 1371 } 1372 } 1373 }); 1374 } 1375 1376 /* 1377 * Generate a hash for the given password. To avoid brute force attacks, we use a salted hash. 1378 * Not the most secure, but it is at least a second level of protection. First level is that 1379 * the file is in a location only readable by the system process. 1380 * @param password the password. 1381 * @param salt the randomly generated salt 1382 * @return the hash of the pattern in a String. 1383 */ 1384 private String passwordToHash(String password, long salt) { 1385 if (password == null) { 1386 return null; 1387 } 1388 String algo = null; 1389 String hashed = salt + password; 1390 try { 1391 byte[] saltedPassword = (password + salt).getBytes(); 1392 byte[] sha1 = MessageDigest.getInstance(algo = "SHA-1").digest(saltedPassword); 1393 byte[] md5 = MessageDigest.getInstance(algo = "MD5").digest(saltedPassword); 1394 hashed = toHex(sha1) + toHex(md5); 1395 } catch (NoSuchAlgorithmException e) { 1396 Log.w(LOG_TAG, "Failed to encode string because of missing algorithm: " + algo); 1397 } 1398 return hashed; 1399 } 1400 1401 private static String toHex(byte[] ary) { 1402 final String hex = "0123456789ABCDEF"; 1403 String ret = ""; 1404 for (int i = 0; i < ary.length; i++) { 1405 ret += hex.charAt((ary[i] >> 4) & 0xf); 1406 ret += hex.charAt(ary[i] & 0xf); 1407 } 1408 return ret; 1409 } 1410 1411 private int getUidForPackage(String packageName) { 1412 long ident = Binder.clearCallingIdentity(); 1413 try { 1414 return mContext.getPackageManager().getApplicationInfo(packageName, 1415 PackageManager.GET_UNINSTALLED_PACKAGES).uid; 1416 } catch (NameNotFoundException nnfe) { 1417 return -1; 1418 } finally { 1419 Binder.restoreCallingIdentity(ident); 1420 } 1421 } 1422 1423 private Bundle readApplicationRestrictionsLocked(String packageName, 1424 int userId) { 1425 final Bundle restrictions = new Bundle(); 1426 final ArrayList<String> values = new ArrayList<String>(); 1427 1428 FileInputStream fis = null; 1429 try { 1430 AtomicFile restrictionsFile = 1431 new AtomicFile(new File(Environment.getUserSystemDirectory(userId), 1432 packageToRestrictionsFileName(packageName))); 1433 fis = restrictionsFile.openRead(); 1434 XmlPullParser parser = Xml.newPullParser(); 1435 parser.setInput(fis, null); 1436 int type; 1437 while ((type = parser.next()) != XmlPullParser.START_TAG 1438 && type != XmlPullParser.END_DOCUMENT) { 1439 ; 1440 } 1441 1442 if (type != XmlPullParser.START_TAG) { 1443 Slog.e(LOG_TAG, "Unable to read restrictions file " 1444 + restrictionsFile.getBaseFile()); 1445 return restrictions; 1446 } 1447 1448 while ((type = parser.next()) != XmlPullParser.END_DOCUMENT) { 1449 if (type == XmlPullParser.START_TAG && parser.getName().equals(TAG_ENTRY)) { 1450 String key = parser.getAttributeValue(null, ATTR_KEY); 1451 String valType = parser.getAttributeValue(null, ATTR_VALUE_TYPE); 1452 String multiple = parser.getAttributeValue(null, ATTR_MULTIPLE); 1453 if (multiple != null) { 1454 int count = Integer.parseInt(multiple); 1455 while (count > 0 && (type = parser.next()) != XmlPullParser.END_DOCUMENT) { 1456 if (type == XmlPullParser.START_TAG 1457 && parser.getName().equals(TAG_VALUE)) { 1458 values.add(parser.nextText().trim()); 1459 count--; 1460 } 1461 } 1462 String [] valueStrings = new String[values.size()]; 1463 values.toArray(valueStrings); 1464 restrictions.putStringArray(key, valueStrings); 1465 } else if (ATTR_TYPE_BOOLEAN.equals(valType)) { 1466 restrictions.putBoolean(key, Boolean.parseBoolean( 1467 parser.nextText().trim())); 1468 } else { 1469 String value = parser.nextText().trim(); 1470 restrictions.putString(key, value); 1471 } 1472 } 1473 } 1474 1475 } catch (IOException ioe) { 1476 } catch (XmlPullParserException pe) { 1477 } finally { 1478 if (fis != null) { 1479 try { 1480 fis.close(); 1481 } catch (IOException e) { 1482 } 1483 } 1484 } 1485 return restrictions; 1486 } 1487 1488 private void writeApplicationRestrictionsLocked(String packageName, 1489 Bundle restrictions, int userId) { 1490 FileOutputStream fos = null; 1491 AtomicFile restrictionsFile = new AtomicFile( 1492 new File(Environment.getUserSystemDirectory(userId), 1493 packageToRestrictionsFileName(packageName))); 1494 try { 1495 fos = restrictionsFile.startWrite(); 1496 final BufferedOutputStream bos = new BufferedOutputStream(fos); 1497 1498 // XmlSerializer serializer = XmlUtils.serializerInstance(); 1499 final XmlSerializer serializer = new FastXmlSerializer(); 1500 serializer.setOutput(bos, "utf-8"); 1501 serializer.startDocument(null, true); 1502 serializer.setFeature("http://xmlpull.org/v1/doc/features.html#indent-output", true); 1503 1504 serializer.startTag(null, TAG_RESTRICTIONS); 1505 1506 for (String key : restrictions.keySet()) { 1507 Object value = restrictions.get(key); 1508 serializer.startTag(null, TAG_ENTRY); 1509 serializer.attribute(null, ATTR_KEY, key); 1510 1511 if (value instanceof Boolean) { 1512 serializer.attribute(null, ATTR_VALUE_TYPE, ATTR_TYPE_BOOLEAN); 1513 serializer.text(value.toString()); 1514 } else if (value == null || value instanceof String) { 1515 serializer.attribute(null, ATTR_VALUE_TYPE, ATTR_TYPE_STRING); 1516 serializer.text(value != null ? (String) value : ""); 1517 } else { 1518 serializer.attribute(null, ATTR_VALUE_TYPE, ATTR_TYPE_STRING_ARRAY); 1519 String[] values = (String[]) value; 1520 serializer.attribute(null, ATTR_MULTIPLE, Integer.toString(values.length)); 1521 for (String choice : values) { 1522 serializer.startTag(null, TAG_VALUE); 1523 serializer.text(choice != null ? choice : ""); 1524 serializer.endTag(null, TAG_VALUE); 1525 } 1526 } 1527 serializer.endTag(null, TAG_ENTRY); 1528 } 1529 1530 serializer.endTag(null, TAG_RESTRICTIONS); 1531 1532 serializer.endDocument(); 1533 restrictionsFile.finishWrite(fos); 1534 } catch (Exception e) { 1535 restrictionsFile.failWrite(fos); 1536 Slog.e(LOG_TAG, "Error writing application restrictions list"); 1537 } 1538 } 1539 1540 @Override 1541 public int getUserSerialNumber(int userHandle) { 1542 synchronized (mPackagesLock) { 1543 if (!exists(userHandle)) return -1; 1544 return getUserInfoLocked(userHandle).serialNumber; 1545 } 1546 } 1547 1548 @Override 1549 public int getUserHandle(int userSerialNumber) { 1550 synchronized (mPackagesLock) { 1551 for (int userId : mUserIds) { 1552 if (getUserInfoLocked(userId).serialNumber == userSerialNumber) return userId; 1553 } 1554 // Not found 1555 return -1; 1556 } 1557 } 1558 1559 /** 1560 * Caches the list of user ids in an array, adjusting the array size when necessary. 1561 */ 1562 private void updateUserIdsLocked() { 1563 int num = 0; 1564 for (int i = 0; i < mUsers.size(); i++) { 1565 if (!mUsers.valueAt(i).partial) { 1566 num++; 1567 } 1568 } 1569 final int[] newUsers = new int[num]; 1570 int n = 0; 1571 for (int i = 0; i < mUsers.size(); i++) { 1572 if (!mUsers.valueAt(i).partial) { 1573 newUsers[n++] = mUsers.keyAt(i); 1574 } 1575 } 1576 mUserIds = newUsers; 1577 } 1578 1579 /** 1580 * Make a note of the last started time of a user and do some cleanup. 1581 * @param userId the user that was just foregrounded 1582 */ 1583 public void userForeground(int userId) { 1584 synchronized (mPackagesLock) { 1585 UserInfo user = mUsers.get(userId); 1586 long now = System.currentTimeMillis(); 1587 if (user == null || user.partial) { 1588 Slog.w(LOG_TAG, "userForeground: unknown user #" + userId); 1589 return; 1590 } 1591 if (now > EPOCH_PLUS_30_YEARS) { 1592 user.lastLoggedInTime = now; 1593 writeUserLocked(user); 1594 } 1595 // If this is not a restricted profile and there is no restrictions pin, clean up 1596 // all restrictions files that might have been left behind, else clean up just the 1597 // ones with uninstalled packages 1598 RestrictionsPinState pinState = mRestrictionsPinStates.get(userId); 1599 final long salt = pinState == null ? 0 : pinState.salt; 1600 cleanAppRestrictions(userId, (!user.isRestricted() && salt == 0)); 1601 } 1602 } 1603 1604 /** 1605 * Returns the next available user id, filling in any holes in the ids. 1606 * TODO: May not be a good idea to recycle ids, in case it results in confusion 1607 * for data and battery stats collection, or unexpected cross-talk. 1608 * @return 1609 */ 1610 private int getNextAvailableIdLocked() { 1611 synchronized (mPackagesLock) { 1612 int i = MIN_USER_ID; 1613 while (i < Integer.MAX_VALUE) { 1614 if (mUsers.indexOfKey(i) < 0 && !mRemovingUserIds.get(i)) { 1615 break; 1616 } 1617 i++; 1618 } 1619 return i; 1620 } 1621 } 1622 1623 private String packageToRestrictionsFileName(String packageName) { 1624 return RESTRICTIONS_FILE_PREFIX + packageName + XML_SUFFIX; 1625 } 1626 1627 private String restrictionsFileNameToPackage(String fileName) { 1628 return fileName.substring(RESTRICTIONS_FILE_PREFIX.length(), 1629 (int) (fileName.length() - XML_SUFFIX.length())); 1630 } 1631 1632 @Override 1633 protected void dump(FileDescriptor fd, PrintWriter pw, String[] args) { 1634 if (mContext.checkCallingOrSelfPermission(android.Manifest.permission.DUMP) 1635 != PackageManager.PERMISSION_GRANTED) { 1636 pw.println("Permission Denial: can't dump UserManager from from pid=" 1637 + Binder.getCallingPid() 1638 + ", uid=" + Binder.getCallingUid() 1639 + " without permission " 1640 + android.Manifest.permission.DUMP); 1641 return; 1642 } 1643 1644 long now = System.currentTimeMillis(); 1645 StringBuilder sb = new StringBuilder(); 1646 synchronized (mPackagesLock) { 1647 pw.println("Users:"); 1648 for (int i = 0; i < mUsers.size(); i++) { 1649 UserInfo user = mUsers.valueAt(i); 1650 if (user == null) continue; 1651 pw.print(" "); pw.print(user); pw.print(" serialNo="); pw.print(user.serialNumber); 1652 if (mRemovingUserIds.get(mUsers.keyAt(i))) pw.print(" <removing> "); 1653 if (user.partial) pw.print(" <partial>"); 1654 pw.println(); 1655 pw.print(" Created: "); 1656 if (user.creationTime == 0) { 1657 pw.println("<unknown>"); 1658 } else { 1659 sb.setLength(0); 1660 TimeUtils.formatDuration(now - user.creationTime, sb); 1661 sb.append(" ago"); 1662 pw.println(sb); 1663 } 1664 pw.print(" Last logged in: "); 1665 if (user.lastLoggedInTime == 0) { 1666 pw.println("<unknown>"); 1667 } else { 1668 sb.setLength(0); 1669 TimeUtils.formatDuration(now - user.lastLoggedInTime, sb); 1670 sb.append(" ago"); 1671 pw.println(sb); 1672 } 1673 } 1674 } 1675 } 1676 1677 private PackageMonitor mUserPackageMonitor = new PackageMonitor() { 1678 @Override 1679 public void onPackageRemoved(String pkg, int uid) { 1680 final int userId = this.getChangingUserId(); 1681 // Package could be disappearing because it is being blocked, so also check if 1682 // it has been uninstalled. 1683 final boolean uninstalled = isPackageDisappearing(pkg) == PACKAGE_PERMANENT_CHANGE; 1684 if (uninstalled && userId >= 0 && !isPackageInstalled(pkg, userId)) { 1685 cleanAppRestrictionsForPackage(pkg, userId); 1686 } 1687 } 1688 }; 1689} 1690