LockPatternUtils.java revision 1f56edc6cd377eab05d9816e93591a7139cdff96
1/* 2 * Copyright (C) 2007 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.internal.widget; 18 19import com.android.internal.R; 20import com.android.internal.telephony.ITelephony; 21import com.google.android.collect.Lists; 22 23import android.app.admin.DevicePolicyManager; 24import android.content.ContentResolver; 25import android.content.Context; 26import android.content.Intent; 27import android.content.pm.PackageManager; 28import android.os.FileObserver; 29import android.os.IBinder; 30import android.os.RemoteException; 31import android.os.ServiceManager; 32import android.os.SystemClock; 33import android.os.storage.IMountService; 34import android.provider.Settings; 35import android.security.KeyStore; 36import android.telephony.TelephonyManager; 37import android.text.TextUtils; 38import android.util.Log; 39import android.view.View; 40import android.widget.Button; 41 42import java.io.File; 43import java.io.FileNotFoundException; 44import java.io.IOException; 45import java.io.RandomAccessFile; 46import java.security.MessageDigest; 47import java.security.NoSuchAlgorithmException; 48import java.security.SecureRandom; 49import java.util.Arrays; 50import java.util.List; 51import java.util.concurrent.atomic.AtomicBoolean; 52 53/** 54 * Utilities for the lock pattern and its settings. 55 */ 56public class LockPatternUtils { 57 58 private static final String OPTION_ENABLE_FACELOCK = "enable_facelock"; 59 60 private static final String TAG = "LockPatternUtils"; 61 62 private static final String SYSTEM_DIRECTORY = "/system/"; 63 private static final String LOCK_PATTERN_FILE = "gesture.key"; 64 private static final String LOCK_PASSWORD_FILE = "password.key"; 65 66 /** 67 * The maximum number of incorrect attempts before the user is prevented 68 * from trying again for {@link #FAILED_ATTEMPT_TIMEOUT_MS}. 69 */ 70 public static final int FAILED_ATTEMPTS_BEFORE_TIMEOUT = 5; 71 72 /** 73 * The number of incorrect attempts before which we fall back on an alternative 74 * method of verifying the user, and resetting their lock pattern. 75 */ 76 public static final int FAILED_ATTEMPTS_BEFORE_RESET = 20; 77 78 /** 79 * How long the user is prevented from trying again after entering the 80 * wrong pattern too many times. 81 */ 82 public static final long FAILED_ATTEMPT_TIMEOUT_MS = 30000L; 83 84 /** 85 * The interval of the countdown for showing progress of the lockout. 86 */ 87 public static final long FAILED_ATTEMPT_COUNTDOWN_INTERVAL_MS = 1000L; 88 89 90 /** 91 * This dictates when we start telling the user that continued failed attempts will wipe 92 * their device. 93 */ 94 public static final int FAILED_ATTEMPTS_BEFORE_WIPE_GRACE = 5; 95 96 /** 97 * The minimum number of dots in a valid pattern. 98 */ 99 public static final int MIN_LOCK_PATTERN_SIZE = 4; 100 101 /** 102 * The minimum number of dots the user must include in a wrong pattern 103 * attempt for it to be counted against the counts that affect 104 * {@link #FAILED_ATTEMPTS_BEFORE_TIMEOUT} and {@link #FAILED_ATTEMPTS_BEFORE_RESET} 105 */ 106 public static final int MIN_PATTERN_REGISTER_FAIL = MIN_LOCK_PATTERN_SIZE; 107 108 private final static String LOCKOUT_PERMANENT_KEY = "lockscreen.lockedoutpermanently"; 109 private final static String LOCKOUT_ATTEMPT_DEADLINE = "lockscreen.lockoutattemptdeadline"; 110 private final static String PATTERN_EVER_CHOSEN_KEY = "lockscreen.patterneverchosen"; 111 public final static String PASSWORD_TYPE_KEY = "lockscreen.password_type"; 112 public static final String PASSWORD_TYPE_ALTERNATE_KEY = "lockscreen.password_type_alternate"; 113 private final static String LOCK_PASSWORD_SALT_KEY = "lockscreen.password_salt"; 114 private final static String DISABLE_LOCKSCREEN_KEY = "lockscreen.disabled"; 115 private final static String LOCKSCREEN_OPTIONS = "lockscreen.options"; 116 public final static String LOCKSCREEN_BIOMETRIC_WEAK_FALLBACK 117 = "lockscreen.biometric_weak_fallback"; 118 public final static String BIOMETRIC_WEAK_EVER_CHOSEN_KEY 119 = "lockscreen.biometricweakeverchosen"; 120 121 private final static String PASSWORD_HISTORY_KEY = "lockscreen.passwordhistory"; 122 123 private final Context mContext; 124 private final ContentResolver mContentResolver; 125 private DevicePolicyManager mDevicePolicyManager; 126 private static String sLockPatternFilename; 127 private static String sLockPasswordFilename; 128 129 private static final AtomicBoolean sHaveNonZeroPatternFile = new AtomicBoolean(false); 130 private static final AtomicBoolean sHaveNonZeroPasswordFile = new AtomicBoolean(false); 131 132 private static FileObserver sPasswordObserver; 133 134 private static class PasswordFileObserver extends FileObserver { 135 public PasswordFileObserver(String path, int mask) { 136 super(path, mask); 137 } 138 139 @Override 140 public void onEvent(int event, String path) { 141 if (LOCK_PATTERN_FILE.equals(path)) { 142 Log.d(TAG, "lock pattern file changed"); 143 sHaveNonZeroPatternFile.set(new File(sLockPatternFilename).length() > 0); 144 } else if (LOCK_PASSWORD_FILE.equals(path)) { 145 Log.d(TAG, "lock password file changed"); 146 sHaveNonZeroPasswordFile.set(new File(sLockPasswordFilename).length() > 0); 147 } 148 } 149 } 150 151 public DevicePolicyManager getDevicePolicyManager() { 152 if (mDevicePolicyManager == null) { 153 mDevicePolicyManager = 154 (DevicePolicyManager)mContext.getSystemService(Context.DEVICE_POLICY_SERVICE); 155 if (mDevicePolicyManager == null) { 156 Log.e(TAG, "Can't get DevicePolicyManagerService: is it running?", 157 new IllegalStateException("Stack trace:")); 158 } 159 } 160 return mDevicePolicyManager; 161 } 162 /** 163 * @param contentResolver Used to look up and save settings. 164 */ 165 public LockPatternUtils(Context context) { 166 mContext = context; 167 mContentResolver = context.getContentResolver(); 168 169 // Initialize the location of gesture & PIN lock files 170 if (sLockPatternFilename == null) { 171 String dataSystemDirectory = 172 android.os.Environment.getDataDirectory().getAbsolutePath() + 173 SYSTEM_DIRECTORY; 174 sLockPatternFilename = dataSystemDirectory + LOCK_PATTERN_FILE; 175 sLockPasswordFilename = dataSystemDirectory + LOCK_PASSWORD_FILE; 176 sHaveNonZeroPatternFile.set(new File(sLockPatternFilename).length() > 0); 177 sHaveNonZeroPasswordFile.set(new File(sLockPasswordFilename).length() > 0); 178 int fileObserverMask = FileObserver.CLOSE_WRITE | FileObserver.DELETE | 179 FileObserver.MOVED_TO | FileObserver.CREATE; 180 sPasswordObserver = new PasswordFileObserver(dataSystemDirectory, fileObserverMask); 181 sPasswordObserver.startWatching(); 182 } 183 } 184 185 public int getRequestedMinimumPasswordLength() { 186 return getDevicePolicyManager().getPasswordMinimumLength(null); 187 } 188 189 190 /** 191 * Gets the device policy password mode. If the mode is non-specific, returns 192 * MODE_PATTERN which allows the user to choose anything. 193 */ 194 public int getRequestedPasswordQuality() { 195 return getDevicePolicyManager().getPasswordQuality(null); 196 } 197 198 public int getRequestedPasswordHistoryLength() { 199 return getDevicePolicyManager().getPasswordHistoryLength(null); 200 } 201 202 public int getRequestedPasswordMinimumLetters() { 203 return getDevicePolicyManager().getPasswordMinimumLetters(null); 204 } 205 206 public int getRequestedPasswordMinimumUpperCase() { 207 return getDevicePolicyManager().getPasswordMinimumUpperCase(null); 208 } 209 210 public int getRequestedPasswordMinimumLowerCase() { 211 return getDevicePolicyManager().getPasswordMinimumLowerCase(null); 212 } 213 214 public int getRequestedPasswordMinimumNumeric() { 215 return getDevicePolicyManager().getPasswordMinimumNumeric(null); 216 } 217 218 public int getRequestedPasswordMinimumSymbols() { 219 return getDevicePolicyManager().getPasswordMinimumSymbols(null); 220 } 221 222 public int getRequestedPasswordMinimumNonLetter() { 223 return getDevicePolicyManager().getPasswordMinimumNonLetter(null); 224 } 225 /** 226 * Returns the actual password mode, as set by keyguard after updating the password. 227 * 228 * @return 229 */ 230 public void reportFailedPasswordAttempt() { 231 getDevicePolicyManager().reportFailedPasswordAttempt(); 232 } 233 234 public void reportSuccessfulPasswordAttempt() { 235 getDevicePolicyManager().reportSuccessfulPasswordAttempt(); 236 } 237 238 /** 239 * Check to see if a pattern matches the saved pattern. If no pattern exists, 240 * always returns true. 241 * @param pattern The pattern to check. 242 * @return Whether the pattern matches the stored one. 243 */ 244 public boolean checkPattern(List<LockPatternView.Cell> pattern) { 245 try { 246 // Read all the bytes from the file 247 RandomAccessFile raf = new RandomAccessFile(sLockPatternFilename, "r"); 248 final byte[] stored = new byte[(int) raf.length()]; 249 int got = raf.read(stored, 0, stored.length); 250 raf.close(); 251 if (got <= 0) { 252 return true; 253 } 254 // Compare the hash from the file with the entered pattern's hash 255 return Arrays.equals(stored, LockPatternUtils.patternToHash(pattern)); 256 } catch (FileNotFoundException fnfe) { 257 return true; 258 } catch (IOException ioe) { 259 return true; 260 } 261 } 262 263 /** 264 * Check to see if a password matches the saved password. If no password exists, 265 * always returns true. 266 * @param password The password to check. 267 * @return Whether the password matches the stored one. 268 */ 269 public boolean checkPassword(String password) { 270 try { 271 // Read all the bytes from the file 272 RandomAccessFile raf = new RandomAccessFile(sLockPasswordFilename, "r"); 273 final byte[] stored = new byte[(int) raf.length()]; 274 int got = raf.read(stored, 0, stored.length); 275 raf.close(); 276 if (got <= 0) { 277 return true; 278 } 279 // Compare the hash from the file with the entered password's hash 280 return Arrays.equals(stored, passwordToHash(password)); 281 } catch (FileNotFoundException fnfe) { 282 return true; 283 } catch (IOException ioe) { 284 return true; 285 } 286 } 287 288 /** 289 * Check to see if a password matches any of the passwords stored in the 290 * password history. 291 * 292 * @param password The password to check. 293 * @return Whether the password matches any in the history. 294 */ 295 public boolean checkPasswordHistory(String password) { 296 String passwordHashString = new String(passwordToHash(password)); 297 String passwordHistory = getString(PASSWORD_HISTORY_KEY); 298 if (passwordHistory == null) { 299 return false; 300 } 301 // Password History may be too long... 302 int passwordHashLength = passwordHashString.length(); 303 int passwordHistoryLength = getRequestedPasswordHistoryLength(); 304 if(passwordHistoryLength == 0) { 305 return false; 306 } 307 int neededPasswordHistoryLength = passwordHashLength * passwordHistoryLength 308 + passwordHistoryLength - 1; 309 if (passwordHistory.length() > neededPasswordHistoryLength) { 310 passwordHistory = passwordHistory.substring(0, neededPasswordHistoryLength); 311 } 312 return passwordHistory.contains(passwordHashString); 313 } 314 315 /** 316 * Check to see if the user has stored a lock pattern. 317 * @return Whether a saved pattern exists. 318 */ 319 public boolean savedPatternExists() { 320 return sHaveNonZeroPatternFile.get(); 321 } 322 323 /** 324 * Check to see if the user has stored a lock pattern. 325 * @return Whether a saved pattern exists. 326 */ 327 public boolean savedPasswordExists() { 328 return sHaveNonZeroPasswordFile.get(); 329 } 330 331 /** 332 * Return true if the user has ever chosen a pattern. This is true even if the pattern is 333 * currently cleared. 334 * 335 * @return True if the user has ever chosen a pattern. 336 */ 337 public boolean isPatternEverChosen() { 338 return getBoolean(PATTERN_EVER_CHOSEN_KEY); 339 } 340 341 /** 342 * Return true if the user has ever chosen biometric weak. This is true even if biometric 343 * weak is not current set. 344 * 345 * @return True if the user has ever chosen biometric weak. 346 */ 347 public boolean isBiometricWeakEverChosen() { 348 return getBoolean(BIOMETRIC_WEAK_EVER_CHOSEN_KEY); 349 } 350 351 /** 352 * Used by device policy manager to validate the current password 353 * information it has. 354 */ 355 public int getActivePasswordQuality() { 356 int activePasswordQuality = DevicePolicyManager.PASSWORD_QUALITY_UNSPECIFIED; 357 // Note we don't want to use getKeyguardStoredPasswordQuality() because we want this to 358 // return biometric_weak if that is being used instead of the backup 359 int quality = 360 (int) getLong(PASSWORD_TYPE_KEY, DevicePolicyManager.PASSWORD_QUALITY_SOMETHING); 361 switch (quality) { 362 case DevicePolicyManager.PASSWORD_QUALITY_SOMETHING: 363 if (isLockPatternEnabled()) { 364 activePasswordQuality = DevicePolicyManager.PASSWORD_QUALITY_SOMETHING; 365 } 366 break; 367 case DevicePolicyManager.PASSWORD_QUALITY_BIOMETRIC_WEAK: 368 if (isBiometricWeakInstalled()) { 369 activePasswordQuality = DevicePolicyManager.PASSWORD_QUALITY_BIOMETRIC_WEAK; 370 } 371 break; 372 case DevicePolicyManager.PASSWORD_QUALITY_NUMERIC: 373 if (isLockPasswordEnabled()) { 374 activePasswordQuality = DevicePolicyManager.PASSWORD_QUALITY_NUMERIC; 375 } 376 break; 377 case DevicePolicyManager.PASSWORD_QUALITY_ALPHABETIC: 378 if (isLockPasswordEnabled()) { 379 activePasswordQuality = DevicePolicyManager.PASSWORD_QUALITY_ALPHABETIC; 380 } 381 break; 382 case DevicePolicyManager.PASSWORD_QUALITY_ALPHANUMERIC: 383 if (isLockPasswordEnabled()) { 384 activePasswordQuality = DevicePolicyManager.PASSWORD_QUALITY_ALPHANUMERIC; 385 } 386 break; 387 case DevicePolicyManager.PASSWORD_QUALITY_COMPLEX: 388 if (isLockPasswordEnabled()) { 389 activePasswordQuality = DevicePolicyManager.PASSWORD_QUALITY_COMPLEX; 390 } 391 break; 392 } 393 394 return activePasswordQuality; 395 } 396 397 /** 398 * Clear any lock pattern or password. 399 */ 400 public void clearLock(boolean isFallback) { 401 if(!isFallback) deleteGallery(); 402 saveLockPassword(null, DevicePolicyManager.PASSWORD_QUALITY_SOMETHING); 403 setLockPatternEnabled(false); 404 saveLockPattern(null); 405 setLong(PASSWORD_TYPE_KEY, DevicePolicyManager.PASSWORD_QUALITY_SOMETHING); 406 setLong(PASSWORD_TYPE_ALTERNATE_KEY, DevicePolicyManager.PASSWORD_QUALITY_UNSPECIFIED); 407 } 408 409 /** 410 * Disable showing lock screen at all when the DevicePolicyManager allows it. 411 * This is only meaningful if pattern, pin or password are not set. 412 * 413 * @param disable Disables lock screen when true 414 */ 415 public void setLockScreenDisabled(boolean disable) { 416 setLong(DISABLE_LOCKSCREEN_KEY, disable ? 1 : 0); 417 } 418 419 /** 420 * Determine if LockScreen can be disabled. This is used, for example, to tell if we should 421 * show LockScreen or go straight to the home screen. 422 * 423 * @return true if lock screen is can be disabled 424 */ 425 public boolean isLockScreenDisabled() { 426 return !isSecure() && getLong(DISABLE_LOCKSCREEN_KEY, 0) != 0; 427 } 428 429 /** 430 * Save a lock pattern. 431 * @param pattern The new pattern to save. 432 */ 433 public void saveLockPattern(List<LockPatternView.Cell> pattern) { 434 this.saveLockPattern(pattern, false); 435 } 436 437 /** 438 * Calls back SetupFaceLock to save the temporary gallery file if this is the backup lock. 439 * This doesn't have to verify that biometric is enabled because it's only called in that case 440 */ 441 void moveTempGallery() { 442 Intent intent = new Intent().setClassName("com.android.facelock", 443 "com.android.facelock.SetupFaceLock"); 444 intent.putExtra("moveTempGallery", true); 445 mContext.startActivity(intent); 446 } 447 448 /** 449 * Calls back SetupFaceLock to delete the temporary gallery file 450 */ 451 public void deleteTempGallery() { 452 Intent intent = new Intent().setClassName("com.android.facelock", 453 "com.android.facelock.SetupFaceLock"); 454 intent.putExtra("deleteTempGallery", true); 455 mContext.startActivity(intent); 456 } 457 458 /** 459 * Calls back SetupFaceLock to delete the gallery file when the lock type is changed 460 */ 461 void deleteGallery() { 462 if(usingBiometricWeak()) { 463 Intent intent = new Intent().setClassName("com.android.facelock", 464 "com.android.facelock.SetupFaceLock"); 465 intent.putExtra("deleteGallery", true); 466 mContext.startActivity(intent); 467 } 468 } 469 470 /** 471 * Save a lock pattern. 472 * @param pattern The new pattern to save. 473 * @param isFallback Specifies if this is a fallback to biometric weak 474 */ 475 public void saveLockPattern(List<LockPatternView.Cell> pattern, boolean isFallback) { 476 // Compute the hash 477 final byte[] hash = LockPatternUtils.patternToHash(pattern); 478 try { 479 // Write the hash to file 480 RandomAccessFile raf = new RandomAccessFile(sLockPatternFilename, "rw"); 481 // Truncate the file if pattern is null, to clear the lock 482 if (pattern == null) { 483 raf.setLength(0); 484 } else { 485 raf.write(hash, 0, hash.length); 486 } 487 raf.close(); 488 DevicePolicyManager dpm = getDevicePolicyManager(); 489 KeyStore keyStore = KeyStore.getInstance(); 490 if (pattern != null) { 491 keyStore.password(patternToString(pattern)); 492 setBoolean(PATTERN_EVER_CHOSEN_KEY, true); 493 if (!isFallback) { 494 deleteGallery(); 495 setLong(PASSWORD_TYPE_KEY, DevicePolicyManager.PASSWORD_QUALITY_SOMETHING); 496 } else { 497 setLong(PASSWORD_TYPE_KEY, DevicePolicyManager.PASSWORD_QUALITY_BIOMETRIC_WEAK); 498 setLong(PASSWORD_TYPE_ALTERNATE_KEY, 499 DevicePolicyManager.PASSWORD_QUALITY_SOMETHING); 500 setBoolean(BIOMETRIC_WEAK_EVER_CHOSEN_KEY, true); 501 moveTempGallery(); 502 } 503 dpm.setActivePasswordState(DevicePolicyManager.PASSWORD_QUALITY_SOMETHING, pattern 504 .size(), 0, 0, 0, 0, 0, 0); 505 } else { 506 if (keyStore.isEmpty()) { 507 keyStore.reset(); 508 } 509 dpm.setActivePasswordState(DevicePolicyManager.PASSWORD_QUALITY_UNSPECIFIED, 0, 0, 510 0, 0, 0, 0, 0); 511 } 512 } catch (FileNotFoundException fnfe) { 513 // Cant do much, unless we want to fail over to using the settings 514 // provider 515 Log.e(TAG, "Unable to save lock pattern to " + sLockPatternFilename); 516 } catch (IOException ioe) { 517 // Cant do much 518 Log.e(TAG, "Unable to save lock pattern to " + sLockPatternFilename); 519 } 520 } 521 522 /** 523 * Compute the password quality from the given password string. 524 */ 525 static public int computePasswordQuality(String password) { 526 boolean hasDigit = false; 527 boolean hasNonDigit = false; 528 final int len = password.length(); 529 for (int i = 0; i < len; i++) { 530 if (Character.isDigit(password.charAt(i))) { 531 hasDigit = true; 532 } else { 533 hasNonDigit = true; 534 } 535 } 536 537 if (hasNonDigit && hasDigit) { 538 return DevicePolicyManager.PASSWORD_QUALITY_ALPHANUMERIC; 539 } 540 if (hasNonDigit) { 541 return DevicePolicyManager.PASSWORD_QUALITY_ALPHABETIC; 542 } 543 if (hasDigit) { 544 return DevicePolicyManager.PASSWORD_QUALITY_NUMERIC; 545 } 546 return DevicePolicyManager.PASSWORD_QUALITY_UNSPECIFIED; 547 } 548 549 /** Update the encryption password if it is enabled **/ 550 private void updateEncryptionPassword(String password) { 551 DevicePolicyManager dpm = getDevicePolicyManager(); 552 if (dpm.getStorageEncryptionStatus() != DevicePolicyManager.ENCRYPTION_STATUS_ACTIVE) { 553 return; 554 } 555 556 IBinder service = ServiceManager.getService("mount"); 557 if (service == null) { 558 Log.e(TAG, "Could not find the mount service to update the encryption password"); 559 return; 560 } 561 562 IMountService mountService = IMountService.Stub.asInterface(service); 563 try { 564 mountService.changeEncryptionPassword(password); 565 } catch (RemoteException e) { 566 Log.e(TAG, "Error changing encryption password", e); 567 } 568 } 569 570 /** 571 * Save a lock password. Does not ensure that the password is as good 572 * as the requested mode, but will adjust the mode to be as good as the 573 * pattern. 574 * @param password The password to save 575 * @param quality {@see DevicePolicyManager#getPasswordQuality(android.content.ComponentName)} 576 */ 577 public void saveLockPassword(String password, int quality) { 578 this.saveLockPassword(password, quality, false); 579 } 580 581 /** 582 * Save a lock password. Does not ensure that the password is as good 583 * as the requested mode, but will adjust the mode to be as good as the 584 * pattern. 585 * @param password The password to save 586 * @param quality {@see DevicePolicyManager#getPasswordQuality(android.content.ComponentName)} 587 * @param isFallback Specifies if this is a fallback to biometric weak 588 */ 589 public void saveLockPassword(String password, int quality, boolean isFallback) { 590 // Compute the hash 591 final byte[] hash = passwordToHash(password); 592 try { 593 // Write the hash to file 594 RandomAccessFile raf = new RandomAccessFile(sLockPasswordFilename, "rw"); 595 // Truncate the file if pattern is null, to clear the lock 596 if (password == null) { 597 raf.setLength(0); 598 } else { 599 raf.write(hash, 0, hash.length); 600 } 601 raf.close(); 602 DevicePolicyManager dpm = getDevicePolicyManager(); 603 KeyStore keyStore = KeyStore.getInstance(); 604 if (password != null) { 605 // Update the encryption password. 606 updateEncryptionPassword(password); 607 608 // Update the keystore password 609 keyStore.password(password); 610 611 int computedQuality = computePasswordQuality(password); 612 if (!isFallback) { 613 deleteGallery(); 614 setLong(PASSWORD_TYPE_KEY, Math.max(quality, computedQuality)); 615 } else { 616 setLong(PASSWORD_TYPE_KEY, DevicePolicyManager.PASSWORD_QUALITY_BIOMETRIC_WEAK); 617 setLong(PASSWORD_TYPE_ALTERNATE_KEY, Math.max(quality, computedQuality)); 618 setBoolean(BIOMETRIC_WEAK_EVER_CHOSEN_KEY, true); 619 moveTempGallery(); 620 } 621 if (computedQuality != DevicePolicyManager.PASSWORD_QUALITY_UNSPECIFIED) { 622 int letters = 0; 623 int uppercase = 0; 624 int lowercase = 0; 625 int numbers = 0; 626 int symbols = 0; 627 int nonletter = 0; 628 for (int i = 0; i < password.length(); i++) { 629 char c = password.charAt(i); 630 if (c >= 'A' && c <= 'Z') { 631 letters++; 632 uppercase++; 633 } else if (c >= 'a' && c <= 'z') { 634 letters++; 635 lowercase++; 636 } else if (c >= '0' && c <= '9') { 637 numbers++; 638 nonletter++; 639 } else { 640 symbols++; 641 nonletter++; 642 } 643 } 644 dpm.setActivePasswordState(Math.max(quality, computedQuality), password 645 .length(), letters, uppercase, lowercase, numbers, symbols, nonletter); 646 } else { 647 // The password is not anything. 648 dpm.setActivePasswordState( 649 DevicePolicyManager.PASSWORD_QUALITY_UNSPECIFIED, 0, 0, 0, 0, 0, 0, 0); 650 } 651 // Add the password to the password history. We assume all 652 // password 653 // hashes have the same length for simplicity of implementation. 654 String passwordHistory = getString(PASSWORD_HISTORY_KEY); 655 if (passwordHistory == null) { 656 passwordHistory = new String(); 657 } 658 int passwordHistoryLength = getRequestedPasswordHistoryLength(); 659 if (passwordHistoryLength == 0) { 660 passwordHistory = ""; 661 } else { 662 passwordHistory = new String(hash) + "," + passwordHistory; 663 // Cut it to contain passwordHistoryLength hashes 664 // and passwordHistoryLength -1 commas. 665 passwordHistory = passwordHistory.substring(0, Math.min(hash.length 666 * passwordHistoryLength + passwordHistoryLength - 1, passwordHistory 667 .length())); 668 } 669 setString(PASSWORD_HISTORY_KEY, passwordHistory); 670 } else { 671 // Conditionally reset the keystore if empty. If 672 // non-empty, we are just switching key guard type 673 if (keyStore.isEmpty()) { 674 keyStore.reset(); 675 } 676 dpm.setActivePasswordState( 677 DevicePolicyManager.PASSWORD_QUALITY_UNSPECIFIED, 0, 0, 0, 0, 0, 0, 0); 678 } 679 } catch (FileNotFoundException fnfe) { 680 // Cant do much, unless we want to fail over to using the settings provider 681 Log.e(TAG, "Unable to save lock pattern to " + sLockPasswordFilename); 682 } catch (IOException ioe) { 683 // Cant do much 684 Log.e(TAG, "Unable to save lock pattern to " + sLockPasswordFilename); 685 } 686 } 687 688 /** 689 * Retrieves the quality mode we're in. 690 * {@see DevicePolicyManager#getPasswordQuality(android.content.ComponentName)} 691 * 692 * @return stored password quality 693 */ 694 public int getKeyguardStoredPasswordQuality() { 695 int quality = 696 (int) getLong(PASSWORD_TYPE_KEY, DevicePolicyManager.PASSWORD_QUALITY_SOMETHING); 697 // If the user has chosen to use weak biometric sensor, then return the backup locking 698 // method and treat biometric as a special case. 699 if (quality == DevicePolicyManager.PASSWORD_QUALITY_BIOMETRIC_WEAK) { 700 quality = 701 (int) getLong(PASSWORD_TYPE_ALTERNATE_KEY, 702 DevicePolicyManager.PASSWORD_QUALITY_SOMETHING); 703 } 704 return quality; 705 } 706 707 /** 708 * @return true if the lockscreen method is set to biometric weak 709 */ 710 public boolean usingBiometricWeak() { 711 int quality = 712 (int) getLong(PASSWORD_TYPE_KEY, DevicePolicyManager.PASSWORD_QUALITY_SOMETHING); 713 return quality == DevicePolicyManager.PASSWORD_QUALITY_BIOMETRIC_WEAK; 714 } 715 716 /** 717 * Deserialize a pattern. 718 * @param string The pattern serialized with {@link #patternToString} 719 * @return The pattern. 720 */ 721 public static List<LockPatternView.Cell> stringToPattern(String string) { 722 List<LockPatternView.Cell> result = Lists.newArrayList(); 723 724 final byte[] bytes = string.getBytes(); 725 for (int i = 0; i < bytes.length; i++) { 726 byte b = bytes[i]; 727 result.add(LockPatternView.Cell.of(b / 3, b % 3)); 728 } 729 return result; 730 } 731 732 /** 733 * Serialize a pattern. 734 * @param pattern The pattern. 735 * @return The pattern in string form. 736 */ 737 public static String patternToString(List<LockPatternView.Cell> pattern) { 738 if (pattern == null) { 739 return ""; 740 } 741 final int patternSize = pattern.size(); 742 743 byte[] res = new byte[patternSize]; 744 for (int i = 0; i < patternSize; i++) { 745 LockPatternView.Cell cell = pattern.get(i); 746 res[i] = (byte) (cell.getRow() * 3 + cell.getColumn()); 747 } 748 return new String(res); 749 } 750 751 /* 752 * Generate an SHA-1 hash for the pattern. Not the most secure, but it is 753 * at least a second level of protection. First level is that the file 754 * is in a location only readable by the system process. 755 * @param pattern the gesture pattern. 756 * @return the hash of the pattern in a byte array. 757 */ 758 private static byte[] patternToHash(List<LockPatternView.Cell> pattern) { 759 if (pattern == null) { 760 return null; 761 } 762 763 final int patternSize = pattern.size(); 764 byte[] res = new byte[patternSize]; 765 for (int i = 0; i < patternSize; i++) { 766 LockPatternView.Cell cell = pattern.get(i); 767 res[i] = (byte) (cell.getRow() * 3 + cell.getColumn()); 768 } 769 try { 770 MessageDigest md = MessageDigest.getInstance("SHA-1"); 771 byte[] hash = md.digest(res); 772 return hash; 773 } catch (NoSuchAlgorithmException nsa) { 774 return res; 775 } 776 } 777 778 private String getSalt() { 779 long salt = getLong(LOCK_PASSWORD_SALT_KEY, 0); 780 if (salt == 0) { 781 try { 782 salt = SecureRandom.getInstance("SHA1PRNG").nextLong(); 783 setLong(LOCK_PASSWORD_SALT_KEY, salt); 784 Log.v(TAG, "Initialized lock password salt"); 785 } catch (NoSuchAlgorithmException e) { 786 // Throw an exception rather than storing a password we'll never be able to recover 787 throw new IllegalStateException("Couldn't get SecureRandom number", e); 788 } 789 } 790 return Long.toHexString(salt); 791 } 792 793 /* 794 * Generate a hash for the given password. To avoid brute force attacks, we use a salted hash. 795 * Not the most secure, but it is at least a second level of protection. First level is that 796 * the file is in a location only readable by the system process. 797 * @param password the gesture pattern. 798 * @return the hash of the pattern in a byte array. 799 */ 800 public byte[] passwordToHash(String password) { 801 if (password == null) { 802 return null; 803 } 804 String algo = null; 805 byte[] hashed = null; 806 try { 807 byte[] saltedPassword = (password + getSalt()).getBytes(); 808 byte[] sha1 = MessageDigest.getInstance(algo = "SHA-1").digest(saltedPassword); 809 byte[] md5 = MessageDigest.getInstance(algo = "MD5").digest(saltedPassword); 810 hashed = (toHex(sha1) + toHex(md5)).getBytes(); 811 } catch (NoSuchAlgorithmException e) { 812 Log.w(TAG, "Failed to encode string because of missing algorithm: " + algo); 813 } 814 return hashed; 815 } 816 817 private static String toHex(byte[] ary) { 818 final String hex = "0123456789ABCDEF"; 819 String ret = ""; 820 for (int i = 0; i < ary.length; i++) { 821 ret += hex.charAt((ary[i] >> 4) & 0xf); 822 ret += hex.charAt(ary[i] & 0xf); 823 } 824 return ret; 825 } 826 827 /** 828 * @return Whether the lock password is enabled, or if it is set as a backup for biometric weak 829 */ 830 public boolean isLockPasswordEnabled() { 831 long mode = getLong(PASSWORD_TYPE_KEY, 0); 832 long backupMode = getLong(PASSWORD_TYPE_ALTERNATE_KEY, 0); 833 final boolean passwordEnabled = mode == DevicePolicyManager.PASSWORD_QUALITY_ALPHABETIC 834 || mode == DevicePolicyManager.PASSWORD_QUALITY_NUMERIC 835 || mode == DevicePolicyManager.PASSWORD_QUALITY_ALPHANUMERIC 836 || mode == DevicePolicyManager.PASSWORD_QUALITY_COMPLEX; 837 final boolean backupEnabled = backupMode == DevicePolicyManager.PASSWORD_QUALITY_ALPHABETIC 838 || backupMode == DevicePolicyManager.PASSWORD_QUALITY_NUMERIC 839 || backupMode == DevicePolicyManager.PASSWORD_QUALITY_ALPHANUMERIC 840 || backupMode == DevicePolicyManager.PASSWORD_QUALITY_COMPLEX; 841 842 return savedPasswordExists() && (passwordEnabled || 843 (usingBiometricWeak() && backupEnabled)); 844 } 845 846 /** 847 * @return Whether the lock pattern is enabled, or if it is set as a backup for biometric weak 848 */ 849 public boolean isLockPatternEnabled() { 850 final boolean backupEnabled = 851 getLong(PASSWORD_TYPE_ALTERNATE_KEY, DevicePolicyManager.PASSWORD_QUALITY_SOMETHING) 852 == DevicePolicyManager.PASSWORD_QUALITY_SOMETHING; 853 854 return getBoolean(Settings.Secure.LOCK_PATTERN_ENABLED) 855 && (getLong(PASSWORD_TYPE_KEY, DevicePolicyManager.PASSWORD_QUALITY_SOMETHING) 856 == DevicePolicyManager.PASSWORD_QUALITY_SOMETHING || 857 (usingBiometricWeak() && backupEnabled)); 858 } 859 860 /** 861 * @return Whether biometric weak lock is installed and that the front facing camera exists 862 */ 863 public boolean isBiometricWeakInstalled() { 864 // Check that the system flag was set 865 if (!OPTION_ENABLE_FACELOCK.equals(getString(LOCKSCREEN_OPTIONS))) { 866 return false; 867 } 868 869 // Check that it's installed 870 PackageManager pm = mContext.getPackageManager(); 871 try { 872 pm.getPackageInfo("com.android.facelock", PackageManager.GET_ACTIVITIES); 873 } catch (PackageManager.NameNotFoundException e) { 874 return false; 875 } 876 877 // Check that the camera is enabled 878 if (!pm.hasSystemFeature(PackageManager.FEATURE_CAMERA_FRONT)) { 879 return false; 880 } 881 if (getDevicePolicyManager().getCameraDisabled(null)) { 882 return false; 883 } 884 885 886 return true; 887 } 888 889 /** 890 * Set whether the lock pattern is enabled. 891 */ 892 public void setLockPatternEnabled(boolean enabled) { 893 setBoolean(Settings.Secure.LOCK_PATTERN_ENABLED, enabled); 894 } 895 896 /** 897 * @return Whether the visible pattern is enabled. 898 */ 899 public boolean isVisiblePatternEnabled() { 900 return getBoolean(Settings.Secure.LOCK_PATTERN_VISIBLE); 901 } 902 903 /** 904 * Set whether the visible pattern is enabled. 905 */ 906 public void setVisiblePatternEnabled(boolean enabled) { 907 setBoolean(Settings.Secure.LOCK_PATTERN_VISIBLE, enabled); 908 } 909 910 /** 911 * @return Whether tactile feedback for the pattern is enabled. 912 */ 913 public boolean isTactileFeedbackEnabled() { 914 return getBoolean(Settings.Secure.LOCK_PATTERN_TACTILE_FEEDBACK_ENABLED); 915 } 916 917 /** 918 * Set whether tactile feedback for the pattern is enabled. 919 */ 920 public void setTactileFeedbackEnabled(boolean enabled) { 921 setBoolean(Settings.Secure.LOCK_PATTERN_TACTILE_FEEDBACK_ENABLED, enabled); 922 } 923 924 /** 925 * Set and store the lockout deadline, meaning the user can't attempt his/her unlock 926 * pattern until the deadline has passed. 927 * @return the chosen deadline. 928 */ 929 public long setLockoutAttemptDeadline() { 930 final long deadline = SystemClock.elapsedRealtime() + FAILED_ATTEMPT_TIMEOUT_MS; 931 setLong(LOCKOUT_ATTEMPT_DEADLINE, deadline); 932 return deadline; 933 } 934 935 /** 936 * @return The elapsed time in millis in the future when the user is allowed to 937 * attempt to enter his/her lock pattern, or 0 if the user is welcome to 938 * enter a pattern. 939 */ 940 public long getLockoutAttemptDeadline() { 941 final long deadline = getLong(LOCKOUT_ATTEMPT_DEADLINE, 0L); 942 final long now = SystemClock.elapsedRealtime(); 943 if (deadline < now || deadline > (now + FAILED_ATTEMPT_TIMEOUT_MS)) { 944 return 0L; 945 } 946 return deadline; 947 } 948 949 /** 950 * @return Whether the user is permanently locked out until they verify their 951 * credentials. Occurs after {@link #FAILED_ATTEMPTS_BEFORE_RESET} failed 952 * attempts. 953 */ 954 public boolean isPermanentlyLocked() { 955 return getBoolean(LOCKOUT_PERMANENT_KEY); 956 } 957 958 /** 959 * Set the state of whether the device is permanently locked, meaning the user 960 * must authenticate via other means. 961 * 962 * @param locked Whether the user is permanently locked out until they verify their 963 * credentials. Occurs after {@link #FAILED_ATTEMPTS_BEFORE_RESET} failed 964 * attempts. 965 */ 966 public void setPermanentlyLocked(boolean locked) { 967 setBoolean(LOCKOUT_PERMANENT_KEY, locked); 968 } 969 970 public boolean isEmergencyCallCapable() { 971 return mContext.getResources().getBoolean( 972 com.android.internal.R.bool.config_voice_capable); 973 } 974 975 public boolean isPukUnlockScreenEnable() { 976 return mContext.getResources().getBoolean( 977 com.android.internal.R.bool.config_enable_puk_unlock_screen); 978 } 979 980 public boolean isEmergencyCallEnabledWhileSimLocked() { 981 return mContext.getResources().getBoolean( 982 com.android.internal.R.bool.config_enable_emergency_call_while_sim_locked); 983 } 984 985 /** 986 * @return A formatted string of the next alarm (for showing on the lock screen), 987 * or null if there is no next alarm. 988 */ 989 public String getNextAlarm() { 990 String nextAlarm = Settings.System.getString(mContentResolver, 991 Settings.System.NEXT_ALARM_FORMATTED); 992 if (nextAlarm == null || TextUtils.isEmpty(nextAlarm)) { 993 return null; 994 } 995 return nextAlarm; 996 } 997 998 private boolean getBoolean(String secureSettingKey) { 999 return 1 == 1000 android.provider.Settings.Secure.getInt(mContentResolver, secureSettingKey, 0); 1001 } 1002 1003 private void setBoolean(String secureSettingKey, boolean enabled) { 1004 android.provider.Settings.Secure.putInt(mContentResolver, secureSettingKey, 1005 enabled ? 1 : 0); 1006 } 1007 1008 private long getLong(String secureSettingKey, long def) { 1009 return android.provider.Settings.Secure.getLong(mContentResolver, secureSettingKey, def); 1010 } 1011 1012 private void setLong(String secureSettingKey, long value) { 1013 android.provider.Settings.Secure.putLong(mContentResolver, secureSettingKey, value); 1014 } 1015 1016 private String getString(String secureSettingKey) { 1017 return android.provider.Settings.Secure.getString(mContentResolver, secureSettingKey); 1018 } 1019 1020 private void setString(String secureSettingKey, String value) { 1021 android.provider.Settings.Secure.putString(mContentResolver, secureSettingKey, value); 1022 } 1023 1024 public boolean isSecure() { 1025 long mode = getKeyguardStoredPasswordQuality(); 1026 final boolean isPattern = mode == DevicePolicyManager.PASSWORD_QUALITY_SOMETHING; 1027 final boolean isPassword = mode == DevicePolicyManager.PASSWORD_QUALITY_NUMERIC 1028 || mode == DevicePolicyManager.PASSWORD_QUALITY_ALPHABETIC 1029 || mode == DevicePolicyManager.PASSWORD_QUALITY_ALPHANUMERIC 1030 || mode == DevicePolicyManager.PASSWORD_QUALITY_COMPLEX; 1031 final boolean secure = isPattern && isLockPatternEnabled() && savedPatternExists() 1032 || isPassword && savedPasswordExists(); 1033 return secure; 1034 } 1035 1036 /** 1037 * Sets the emergency button visibility based on isEmergencyCallCapable(). 1038 * 1039 * If the emergency button is visible, sets the text on the emergency button 1040 * to indicate what action will be taken. 1041 * 1042 * If there's currently a call in progress, the button will take them to the call 1043 * @param button the button to update 1044 * @param the phone state: 1045 * {@link TelephonyManager#CALL_STATE_IDLE} 1046 * {@link TelephonyManager#CALL_STATE_RINGING} 1047 * {@link TelephonyManager#CALL_STATE_OFFHOOK} 1048 * @param shown indicates whether the given screen wants the emergency button to show at all 1049 */ 1050 public void updateEmergencyCallButtonState(Button button, int phoneState, boolean shown) { 1051 if (isEmergencyCallCapable() && shown) { 1052 button.setVisibility(View.VISIBLE); 1053 } else { 1054 button.setVisibility(View.GONE); 1055 return; 1056 } 1057 1058 int textId; 1059 if (phoneState == TelephonyManager.CALL_STATE_OFFHOOK) { 1060 // show "return to call" text and show phone icon 1061 textId = R.string.lockscreen_return_to_call; 1062 int phoneCallIcon = R.drawable.stat_sys_phone_call; 1063 button.setCompoundDrawablesWithIntrinsicBounds(phoneCallIcon, 0, 0, 0); 1064 } else { 1065 textId = R.string.lockscreen_emergency_call; 1066 int emergencyIcon = R.drawable.ic_emergency; 1067 button.setCompoundDrawablesWithIntrinsicBounds(emergencyIcon, 0, 0, 0); 1068 } 1069 button.setText(textId); 1070 } 1071 1072 /** 1073 * Resumes a call in progress. Typically launched from the EmergencyCall button 1074 * on various lockscreens. 1075 * 1076 * @return true if we were able to tell InCallScreen to show. 1077 */ 1078 public boolean resumeCall() { 1079 ITelephony phone = ITelephony.Stub.asInterface(ServiceManager.checkService("phone")); 1080 try { 1081 if (phone != null && phone.showCallScreen()) { 1082 return true; 1083 } 1084 } catch (RemoteException e) { 1085 // What can we do? 1086 } 1087 return false; 1088 } 1089} 1090