Amith Yamasani | 52c489c | 2012-03-28 11:42:42 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (C) 2012 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 | |
| 17 | package com.android.internal.widget; |
| 18 | |
| 19 | import android.content.ContentResolver; |
| 20 | import android.content.ContentValues; |
| 21 | import android.content.Context; |
| 22 | import android.database.Cursor; |
| 23 | import android.database.sqlite.SQLiteDatabase; |
| 24 | import android.database.sqlite.SQLiteOpenHelper; |
| 25 | import android.os.Binder; |
| 26 | import android.os.RemoteException; |
| 27 | import android.os.UserId; |
| 28 | import android.provider.Settings; |
| 29 | import android.provider.Settings.Secure; |
| 30 | import android.text.TextUtils; |
| 31 | import android.util.Slog; |
| 32 | |
| 33 | import java.io.File; |
| 34 | import java.io.FileNotFoundException; |
| 35 | import java.io.IOException; |
| 36 | import java.io.RandomAccessFile; |
| 37 | import java.util.Arrays; |
| 38 | |
| 39 | /** |
| 40 | * Keeps the lock pattern/password data and related settings for each user. |
| 41 | * Used by LockPatternUtils. Needs to be a service because Settings app also needs |
| 42 | * to be able to save lockscreen information for secondary users. |
| 43 | * @hide |
| 44 | */ |
| 45 | public class LockSettingsService extends ILockSettings.Stub { |
| 46 | |
| 47 | private final DatabaseHelper mOpenHelper; |
| 48 | private static final String TAG = "LockSettingsService"; |
| 49 | |
| 50 | private static final String TABLE = "locksettings"; |
| 51 | private static final String COLUMN_KEY = "name"; |
| 52 | private static final String COLUMN_USERID = "user"; |
| 53 | private static final String COLUMN_VALUE = "value"; |
| 54 | |
| 55 | private static final String[] COLUMNS_FOR_QUERY = { |
| 56 | COLUMN_VALUE |
| 57 | }; |
| 58 | |
| 59 | private static final String SYSTEM_DIRECTORY = "/system/"; |
| 60 | private static final String LOCK_PATTERN_FILE = "gesture.key"; |
| 61 | private static final String LOCK_PASSWORD_FILE = "password.key"; |
| 62 | |
| 63 | private final Context mContext; |
| 64 | |
| 65 | public LockSettingsService(Context context) { |
| 66 | mContext = context; |
| 67 | // Open the database |
| 68 | mOpenHelper = new DatabaseHelper(mContext); |
| 69 | } |
| 70 | |
| 71 | public void systemReady() { |
| 72 | migrateOldData(); |
| 73 | } |
| 74 | |
| 75 | private void migrateOldData() { |
| 76 | try { |
| 77 | if (getString("migrated", null, 0) != null) { |
| 78 | // Already migrated |
| 79 | return; |
| 80 | } |
| 81 | |
| 82 | final ContentResolver cr = mContext.getContentResolver(); |
| 83 | for (String validSetting : VALID_SETTINGS) { |
| 84 | String value = Settings.Secure.getString(cr, validSetting); |
| 85 | if (value != null) { |
| 86 | setString(validSetting, value, 0); |
| 87 | } |
| 88 | } |
| 89 | // No need to move the password / pattern files. They're already in the right place. |
| 90 | setString("migrated", "true", 0); |
| 91 | Slog.i(TAG, "Migrated lock settings to new location"); |
| 92 | } catch (RemoteException re) { |
| 93 | Slog.e(TAG, "Unable to migrate old data"); |
| 94 | } |
| 95 | } |
| 96 | |
| 97 | private static final void checkWritePermission(int userId) { |
| 98 | final int callingUid = Binder.getCallingUid(); |
| 99 | if (UserId.getAppId(callingUid) != android.os.Process.SYSTEM_UID) { |
| 100 | throw new SecurityException("uid=" + callingUid |
| 101 | + " not authorized to write lock settings"); |
| 102 | } |
| 103 | } |
| 104 | |
| 105 | private static final void checkPasswordReadPermission(int userId) { |
| 106 | final int callingUid = Binder.getCallingUid(); |
| 107 | if (UserId.getAppId(callingUid) != android.os.Process.SYSTEM_UID) { |
| 108 | throw new SecurityException("uid=" + callingUid |
| 109 | + " not authorized to read lock password"); |
| 110 | } |
| 111 | } |
| 112 | |
| 113 | private static final void checkReadPermission(int userId) { |
| 114 | final int callingUid = Binder.getCallingUid(); |
| 115 | if (UserId.getAppId(callingUid) != android.os.Process.SYSTEM_UID |
| 116 | && UserId.getUserId(callingUid) != userId) { |
| 117 | throw new SecurityException("uid=" + callingUid |
| 118 | + " not authorized to read settings of user " + userId); |
| 119 | } |
| 120 | } |
| 121 | |
| 122 | @Override |
| 123 | public void setBoolean(String key, boolean value, int userId) throws RemoteException { |
| 124 | checkWritePermission(userId); |
| 125 | |
| 126 | writeToDb(key, value ? "1" : "0", userId); |
| 127 | } |
| 128 | |
| 129 | @Override |
| 130 | public void setLong(String key, long value, int userId) throws RemoteException { |
| 131 | checkWritePermission(userId); |
| 132 | |
| 133 | writeToDb(key, Long.toString(value), userId); |
| 134 | } |
| 135 | |
| 136 | @Override |
| 137 | public void setString(String key, String value, int userId) throws RemoteException { |
| 138 | checkWritePermission(userId); |
| 139 | |
| 140 | writeToDb(key, value, userId); |
| 141 | } |
| 142 | |
| 143 | @Override |
| 144 | public boolean getBoolean(String key, boolean defaultValue, int userId) throws RemoteException { |
| 145 | //checkReadPermission(userId); |
| 146 | |
| 147 | String value = readFromDb(key, null, userId); |
| 148 | return TextUtils.isEmpty(value) ? |
| 149 | defaultValue : (value.equals("1") || value.equals("true")); |
| 150 | } |
| 151 | |
| 152 | @Override |
| 153 | public long getLong(String key, long defaultValue, int userId) throws RemoteException { |
| 154 | //checkReadPermission(userId); |
| 155 | |
| 156 | String value = readFromDb(key, null, userId); |
| 157 | return TextUtils.isEmpty(value) ? defaultValue : Long.parseLong(value); |
| 158 | } |
| 159 | |
| 160 | @Override |
| 161 | public String getString(String key, String defaultValue, int userId) throws RemoteException { |
| 162 | //checkReadPermission(userId); |
| 163 | |
| 164 | return readFromDb(key, defaultValue, userId); |
| 165 | } |
| 166 | |
| 167 | private String getLockPatternFilename(int userId) { |
| 168 | String dataSystemDirectory = |
| 169 | android.os.Environment.getDataDirectory().getAbsolutePath() + |
| 170 | SYSTEM_DIRECTORY; |
| 171 | if (userId == 0) { |
| 172 | // Leave it in the same place for user 0 |
| 173 | return dataSystemDirectory + LOCK_PATTERN_FILE; |
| 174 | } else { |
| 175 | return dataSystemDirectory + "users/" + userId + "/" + LOCK_PATTERN_FILE; |
| 176 | } |
| 177 | } |
| 178 | |
| 179 | private String getLockPasswordFilename(int userId) { |
| 180 | String dataSystemDirectory = |
| 181 | android.os.Environment.getDataDirectory().getAbsolutePath() + |
| 182 | SYSTEM_DIRECTORY; |
| 183 | if (userId == 0) { |
| 184 | // Leave it in the same place for user 0 |
| 185 | return dataSystemDirectory + LOCK_PASSWORD_FILE; |
| 186 | } else { |
| 187 | return dataSystemDirectory + "users/" + userId + "/" + LOCK_PASSWORD_FILE; |
| 188 | } |
| 189 | } |
| 190 | |
| 191 | @Override |
| 192 | public boolean havePassword(int userId) throws RemoteException { |
| 193 | // Do we need a permissions check here? |
| 194 | |
| 195 | return new File(getLockPasswordFilename(userId)).length() > 0; |
| 196 | } |
| 197 | |
| 198 | @Override |
| 199 | public boolean havePattern(int userId) throws RemoteException { |
| 200 | // Do we need a permissions check here? |
| 201 | |
| 202 | return new File(getLockPatternFilename(userId)).length() > 0; |
| 203 | } |
| 204 | |
| 205 | @Override |
| 206 | public void setLockPattern(byte[] hash, int userId) throws RemoteException { |
| 207 | checkWritePermission(userId); |
| 208 | |
| 209 | writeFile(getLockPatternFilename(userId), hash); |
| 210 | } |
| 211 | |
| 212 | @Override |
| 213 | public boolean checkPattern(byte[] hash, int userId) throws RemoteException { |
| 214 | checkPasswordReadPermission(userId); |
| 215 | try { |
| 216 | // Read all the bytes from the file |
| 217 | RandomAccessFile raf = new RandomAccessFile(getLockPatternFilename(userId), "r"); |
| 218 | final byte[] stored = new byte[(int) raf.length()]; |
| 219 | int got = raf.read(stored, 0, stored.length); |
| 220 | raf.close(); |
| 221 | if (got <= 0) { |
| 222 | return true; |
| 223 | } |
| 224 | // Compare the hash from the file with the entered pattern's hash |
| 225 | return Arrays.equals(stored, hash); |
| 226 | } catch (FileNotFoundException fnfe) { |
| 227 | Slog.e(TAG, "Cannot read file " + fnfe); |
| 228 | return true; |
| 229 | } catch (IOException ioe) { |
| 230 | Slog.e(TAG, "Cannot read file " + ioe); |
| 231 | return true; |
| 232 | } |
| 233 | } |
| 234 | |
| 235 | @Override |
| 236 | public void setLockPassword(byte[] hash, int userId) throws RemoteException { |
| 237 | checkWritePermission(userId); |
| 238 | |
| 239 | writeFile(getLockPasswordFilename(userId), hash); |
| 240 | } |
| 241 | |
| 242 | @Override |
| 243 | public boolean checkPassword(byte[] hash, int userId) throws RemoteException { |
| 244 | checkPasswordReadPermission(userId); |
| 245 | |
| 246 | try { |
| 247 | // Read all the bytes from the file |
| 248 | RandomAccessFile raf = new RandomAccessFile(getLockPasswordFilename(userId), "r"); |
| 249 | final byte[] stored = new byte[(int) raf.length()]; |
| 250 | int got = raf.read(stored, 0, stored.length); |
| 251 | raf.close(); |
| 252 | if (got <= 0) { |
| 253 | return true; |
| 254 | } |
| 255 | // Compare the hash from the file with the entered password's hash |
| 256 | return Arrays.equals(stored, hash); |
| 257 | } catch (FileNotFoundException fnfe) { |
| 258 | Slog.e(TAG, "Cannot read file " + fnfe); |
| 259 | return true; |
| 260 | } catch (IOException ioe) { |
| 261 | Slog.e(TAG, "Cannot read file " + ioe); |
| 262 | return true; |
| 263 | } |
| 264 | } |
| 265 | |
| 266 | @Override |
| 267 | public void removeUser(int userId) { |
| 268 | checkWritePermission(userId); |
| 269 | |
| 270 | SQLiteDatabase db = mOpenHelper.getWritableDatabase(); |
| 271 | try { |
| 272 | File file = new File(getLockPasswordFilename(userId)); |
| 273 | if (file.exists()) { |
| 274 | file.delete(); |
| 275 | } |
| 276 | file = new File(getLockPatternFilename(userId)); |
| 277 | if (file.exists()) { |
| 278 | file.delete(); |
| 279 | } |
| 280 | |
| 281 | db.beginTransaction(); |
| 282 | db.delete(TABLE, COLUMN_USERID + "='" + userId + "'", null); |
| 283 | db.setTransactionSuccessful(); |
| 284 | } finally { |
| 285 | db.endTransaction(); |
| 286 | } |
| 287 | } |
| 288 | |
| 289 | private void writeFile(String name, byte[] hash) { |
| 290 | try { |
| 291 | // Write the hash to file |
| 292 | RandomAccessFile raf = new RandomAccessFile(name, "rw"); |
| 293 | // Truncate the file if pattern is null, to clear the lock |
| 294 | if (hash == null || hash.length == 0) { |
| 295 | raf.setLength(0); |
| 296 | } else { |
| 297 | raf.write(hash, 0, hash.length); |
| 298 | } |
| 299 | raf.close(); |
| 300 | } catch (IOException ioe) { |
| 301 | Slog.e(TAG, "Error writing to file " + ioe); |
| 302 | } |
| 303 | } |
| 304 | |
| 305 | private void writeToDb(String key, String value, int userId) { |
| 306 | ContentValues cv = new ContentValues(); |
| 307 | cv.put(COLUMN_KEY, key); |
| 308 | cv.put(COLUMN_USERID, userId); |
| 309 | cv.put(COLUMN_VALUE, value); |
| 310 | |
| 311 | SQLiteDatabase db = mOpenHelper.getWritableDatabase(); |
| 312 | db.beginTransaction(); |
| 313 | try { |
| 314 | db.delete(TABLE, COLUMN_KEY + "=? AND " + COLUMN_USERID + "=?", |
| 315 | new String[] {key, Integer.toString(userId)}); |
| 316 | db.insert(TABLE, null, cv); |
| 317 | db.setTransactionSuccessful(); |
| 318 | } finally { |
| 319 | db.endTransaction(); |
| 320 | } |
| 321 | } |
| 322 | |
| 323 | private String readFromDb(String key, String defaultValue, int userId) { |
| 324 | Cursor cursor; |
| 325 | String result = defaultValue; |
| 326 | SQLiteDatabase db = mOpenHelper.getReadableDatabase(); |
| 327 | if ((cursor = db.query(TABLE, COLUMNS_FOR_QUERY, |
| 328 | COLUMN_USERID + "=? AND " + COLUMN_KEY + "=?", |
| 329 | new String[] { Integer.toString(userId), key }, |
| 330 | null, null, null)) != null) { |
| 331 | if (cursor.moveToFirst()) { |
| 332 | result = cursor.getString(0); |
| 333 | } |
| 334 | cursor.close(); |
| 335 | } |
| 336 | return result; |
| 337 | } |
| 338 | |
| 339 | class DatabaseHelper extends SQLiteOpenHelper { |
| 340 | private static final String TAG = "LockSettingsDB"; |
| 341 | private static final String DATABASE_NAME = "locksettings.db"; |
| 342 | |
| 343 | private static final int DATABASE_VERSION = 1; |
| 344 | |
| 345 | public DatabaseHelper(Context context) { |
| 346 | super(context, DATABASE_NAME, null, DATABASE_VERSION); |
| 347 | setWriteAheadLoggingEnabled(true); |
| 348 | } |
| 349 | |
| 350 | private void createTable(SQLiteDatabase db) { |
| 351 | db.execSQL("CREATE TABLE " + TABLE + " (" + |
| 352 | "_id INTEGER PRIMARY KEY AUTOINCREMENT," + |
| 353 | COLUMN_KEY + " TEXT," + |
| 354 | COLUMN_USERID + " INTEGER," + |
| 355 | COLUMN_VALUE + " TEXT" + |
| 356 | ");"); |
| 357 | } |
| 358 | |
| 359 | @Override |
| 360 | public void onCreate(SQLiteDatabase db) { |
| 361 | createTable(db); |
| 362 | } |
| 363 | |
| 364 | @Override |
| 365 | public void onUpgrade(SQLiteDatabase db, int oldVersion, int currentVersion) { |
| 366 | // Nothing yet |
| 367 | } |
| 368 | } |
| 369 | |
| 370 | private static final String[] VALID_SETTINGS = new String[] { |
| 371 | LockPatternUtils.LOCKOUT_PERMANENT_KEY, |
| 372 | LockPatternUtils.LOCKOUT_ATTEMPT_DEADLINE, |
| 373 | LockPatternUtils.PATTERN_EVER_CHOSEN_KEY, |
| 374 | LockPatternUtils.PASSWORD_TYPE_KEY, |
| 375 | LockPatternUtils.PASSWORD_TYPE_ALTERNATE_KEY, |
| 376 | LockPatternUtils.LOCK_PASSWORD_SALT_KEY, |
| 377 | LockPatternUtils.DISABLE_LOCKSCREEN_KEY, |
| 378 | LockPatternUtils.LOCKSCREEN_OPTIONS, |
| 379 | LockPatternUtils.LOCKSCREEN_BIOMETRIC_WEAK_FALLBACK, |
| 380 | LockPatternUtils.BIOMETRIC_WEAK_EVER_CHOSEN_KEY, |
| 381 | LockPatternUtils.LOCKSCREEN_POWER_BUTTON_INSTANTLY_LOCKS, |
| 382 | LockPatternUtils.PASSWORD_HISTORY_KEY, |
| 383 | Secure.LOCK_PATTERN_ENABLED, |
| 384 | Secure.LOCK_BIOMETRIC_WEAK_FLAGS, |
| 385 | Secure.LOCK_PATTERN_VISIBLE, |
| 386 | Secure.LOCK_PATTERN_TACTILE_FEEDBACK_ENABLED |
| 387 | }; |
| 388 | } |