Andres Morales | 963295e | 2014-07-10 15:40:24 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2014 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 | |
Andres Morales | 68d4acd | 2014-07-01 19:40:41 -0700 | [diff] [blame] | 17 | package com.android.server; |
| 18 | |
| 19 | import android.Manifest; |
Guang Zhu | 514c580 | 2014-09-12 15:14:00 -0700 | [diff] [blame] | 20 | import android.app.ActivityManager; |
Andres Morales | 68d4acd | 2014-07-01 19:40:41 -0700 | [diff] [blame] | 21 | import android.content.Context; |
| 22 | import android.content.pm.PackageManager; |
| 23 | import android.os.Binder; |
| 24 | import android.os.IBinder; |
| 25 | import android.os.RemoteException; |
| 26 | import android.os.SystemProperties; |
Andres Morales | 6429f31 | 2014-08-04 16:35:15 -0700 | [diff] [blame] | 27 | import android.os.UserHandle; |
Xiaohui Chen | f066078 | 2015-09-02 14:25:19 -0700 | [diff] [blame] | 28 | import android.os.UserManager; |
Andres Morales | 68d4acd | 2014-07-01 19:40:41 -0700 | [diff] [blame] | 29 | import android.service.persistentdata.IPersistentDataBlockService; |
Andres Morales | 74e9b18 | 2016-02-22 12:33:33 -0800 | [diff] [blame] | 30 | import android.service.persistentdata.PersistentDataBlockManager; |
Andres Morales | 963295e | 2014-07-10 15:40:24 -0700 | [diff] [blame] | 31 | import android.util.Slog; |
Guang Zhu | 514c580 | 2014-09-12 15:14:00 -0700 | [diff] [blame] | 32 | |
Andres Morales | 68d4acd | 2014-07-01 19:40:41 -0700 | [diff] [blame] | 33 | import com.android.internal.R; |
Charles He | f6f1d62 | 2016-12-01 19:22:33 +0000 | [diff] [blame^] | 34 | import com.android.internal.annotations.GuardedBy; |
Guang Zhu | 514c580 | 2014-09-12 15:14:00 -0700 | [diff] [blame] | 35 | |
Andres Morales | 963295e | 2014-07-10 15:40:24 -0700 | [diff] [blame] | 36 | import libcore.io.IoUtils; |
Andres Morales | 68d4acd | 2014-07-01 19:40:41 -0700 | [diff] [blame] | 37 | |
| 38 | import java.io.DataInputStream; |
| 39 | import java.io.DataOutputStream; |
| 40 | import java.io.File; |
| 41 | import java.io.FileInputStream; |
| 42 | import java.io.FileNotFoundException; |
| 43 | import java.io.FileOutputStream; |
| 44 | import java.io.IOException; |
| 45 | import java.nio.ByteBuffer; |
| 46 | import java.nio.channels.FileChannel; |
Andres Morales | 2830130 | 2014-11-12 07:56:46 -0800 | [diff] [blame] | 47 | import java.security.MessageDigest; |
| 48 | import java.security.NoSuchAlgorithmException; |
| 49 | import java.util.Arrays; |
Andres Morales | 68d4acd | 2014-07-01 19:40:41 -0700 | [diff] [blame] | 50 | |
| 51 | /** |
| 52 | * Service for reading and writing blocks to a persistent partition. |
Andres Morales | 963295e | 2014-07-10 15:40:24 -0700 | [diff] [blame] | 53 | * This data will live across factory resets not initiated via the Settings UI. |
| 54 | * When a device is factory reset through Settings this data is wiped. |
Andres Morales | 68d4acd | 2014-07-01 19:40:41 -0700 | [diff] [blame] | 55 | * |
Charles He | a629c77 | 2016-11-24 14:05:00 +0000 | [diff] [blame] | 56 | * Allows writing one block at a time. Namely, each time {@link IPersistentDataBlockService#write} |
| 57 | * is called, it will overwrite the data that was previously written on the block. |
Andres Morales | 68d4acd | 2014-07-01 19:40:41 -0700 | [diff] [blame] | 58 | * |
| 59 | * Clients can query the size of the currently written block via |
Charles He | a629c77 | 2016-11-24 14:05:00 +0000 | [diff] [blame] | 60 | * {@link IPersistentDataBlockService#getDataBlockSize} |
Andres Morales | 68d4acd | 2014-07-01 19:40:41 -0700 | [diff] [blame] | 61 | * |
Charles He | a629c77 | 2016-11-24 14:05:00 +0000 | [diff] [blame] | 62 | * Clients can read any number of bytes from the currently written block up to its total size by |
| 63 | * invoking {@link IPersistentDataBlockService#read} |
Andres Morales | 68d4acd | 2014-07-01 19:40:41 -0700 | [diff] [blame] | 64 | */ |
| 65 | public class PersistentDataBlockService extends SystemService { |
| 66 | private static final String TAG = PersistentDataBlockService.class.getSimpleName(); |
| 67 | |
| 68 | private static final String PERSISTENT_DATA_BLOCK_PROP = "ro.frp.pst"; |
| 69 | private static final int HEADER_SIZE = 8; |
Andres Morales | 963295e | 2014-07-10 15:40:24 -0700 | [diff] [blame] | 70 | // Magic number to mark block device as adhering to the format consumed by this service |
Andres Morales | 2830130 | 2014-11-12 07:56:46 -0800 | [diff] [blame] | 71 | private static final int PARTITION_TYPE_MARKER = 0x19901873; |
Andres Morales | 963295e | 2014-07-10 15:40:24 -0700 | [diff] [blame] | 72 | // Limit to 100k as blocks larger than this might cause strain on Binder. |
Andres Morales | 963295e | 2014-07-10 15:40:24 -0700 | [diff] [blame] | 73 | private static final int MAX_DATA_BLOCK_SIZE = 1024 * 100; |
Andres Morales | 2830130 | 2014-11-12 07:56:46 -0800 | [diff] [blame] | 74 | public static final int DIGEST_SIZE_BYTES = 32; |
Andres Morales | 5ca4cc5 | 2015-03-19 16:37:54 -0700 | [diff] [blame] | 75 | private static final String OEM_UNLOCK_PROP = "sys.oem_unlock_allowed"; |
Andres Morales | 74e9b18 | 2016-02-22 12:33:33 -0800 | [diff] [blame] | 76 | private static final String FLASH_LOCK_PROP = "ro.boot.flash.locked"; |
| 77 | private static final String FLASH_LOCK_LOCKED = "1"; |
| 78 | private static final String FLASH_LOCK_UNLOCKED = "0"; |
Andres Morales | 68d4acd | 2014-07-01 19:40:41 -0700 | [diff] [blame] | 79 | |
| 80 | private final Context mContext; |
| 81 | private final String mDataBlockFile; |
Andres Morales | 963295e | 2014-07-10 15:40:24 -0700 | [diff] [blame] | 82 | private final Object mLock = new Object(); |
Andres Morales | 6429f31 | 2014-08-04 16:35:15 -0700 | [diff] [blame] | 83 | |
Andres Morales | a31c23d | 2014-10-30 15:31:31 -0700 | [diff] [blame] | 84 | private int mAllowedUid = -1; |
Andres Morales | 963295e | 2014-07-10 15:40:24 -0700 | [diff] [blame] | 85 | private long mBlockDeviceSize; |
Charles He | f6f1d62 | 2016-12-01 19:22:33 +0000 | [diff] [blame^] | 86 | |
| 87 | @GuardedBy("mLock") |
Charles He | a629c77 | 2016-11-24 14:05:00 +0000 | [diff] [blame] | 88 | private boolean mIsWritable = true; |
Andres Morales | 68d4acd | 2014-07-01 19:40:41 -0700 | [diff] [blame] | 89 | |
| 90 | public PersistentDataBlockService(Context context) { |
| 91 | super(context); |
| 92 | mContext = context; |
| 93 | mDataBlockFile = SystemProperties.get(PERSISTENT_DATA_BLOCK_PROP); |
Andres Morales | 963295e | 2014-07-10 15:40:24 -0700 | [diff] [blame] | 94 | mBlockDeviceSize = -1; // Load lazily |
Xiaohui Chen | f066078 | 2015-09-02 14:25:19 -0700 | [diff] [blame] | 95 | mAllowedUid = getAllowedUid(UserHandle.USER_SYSTEM); |
Andres Morales | 6429f31 | 2014-08-04 16:35:15 -0700 | [diff] [blame] | 96 | } |
| 97 | |
Andres Morales | a31c23d | 2014-10-30 15:31:31 -0700 | [diff] [blame] | 98 | private int getAllowedUid(int userHandle) { |
Andres Morales | 6429f31 | 2014-08-04 16:35:15 -0700 | [diff] [blame] | 99 | String allowedPackage = mContext.getResources() |
Andres Morales | 68d4acd | 2014-07-01 19:40:41 -0700 | [diff] [blame] | 100 | .getString(R.string.config_persistentDataPackageName); |
| 101 | PackageManager pm = mContext.getPackageManager(); |
| 102 | int allowedUid = -1; |
| 103 | try { |
Jeff Sharkey | c5967e9 | 2016-01-07 18:50:29 -0700 | [diff] [blame] | 104 | allowedUid = pm.getPackageUidAsUser(allowedPackage, |
| 105 | PackageManager.MATCH_SYSTEM_ONLY, userHandle); |
Andres Morales | 68d4acd | 2014-07-01 19:40:41 -0700 | [diff] [blame] | 106 | } catch (PackageManager.NameNotFoundException e) { |
| 107 | // not expected |
Andres Morales | 963295e | 2014-07-10 15:40:24 -0700 | [diff] [blame] | 108 | Slog.e(TAG, "not able to find package " + allowedPackage, e); |
Andres Morales | 68d4acd | 2014-07-01 19:40:41 -0700 | [diff] [blame] | 109 | } |
Andres Morales | a31c23d | 2014-10-30 15:31:31 -0700 | [diff] [blame] | 110 | return allowedUid; |
Andres Morales | 68d4acd | 2014-07-01 19:40:41 -0700 | [diff] [blame] | 111 | } |
| 112 | |
| 113 | @Override |
| 114 | public void onStart() { |
Andres Morales | 2830130 | 2014-11-12 07:56:46 -0800 | [diff] [blame] | 115 | enforceChecksumValidity(); |
Andres Morales | 1ce7d17 | 2015-01-07 14:24:57 -0800 | [diff] [blame] | 116 | formatIfOemUnlockEnabled(); |
Andres Morales | 68d4acd | 2014-07-01 19:40:41 -0700 | [diff] [blame] | 117 | publishBinderService(Context.PERSISTENT_DATA_BLOCK_SERVICE, mService); |
| 118 | } |
| 119 | |
Andres Morales | 1ce7d17 | 2015-01-07 14:24:57 -0800 | [diff] [blame] | 120 | private void formatIfOemUnlockEnabled() { |
Andres Morales | 5ca4cc5 | 2015-03-19 16:37:54 -0700 | [diff] [blame] | 121 | boolean enabled = doGetOemUnlockEnabled(); |
| 122 | if (enabled) { |
Andres Morales | 1ce7d17 | 2015-01-07 14:24:57 -0800 | [diff] [blame] | 123 | synchronized (mLock) { |
Andres Morales | c8f952c | 2015-03-19 08:34:55 -0700 | [diff] [blame] | 124 | formatPartitionLocked(true); |
Andres Morales | 1ce7d17 | 2015-01-07 14:24:57 -0800 | [diff] [blame] | 125 | } |
| 126 | } |
Andres Morales | 5ca4cc5 | 2015-03-19 16:37:54 -0700 | [diff] [blame] | 127 | |
| 128 | SystemProperties.set(OEM_UNLOCK_PROP, enabled ? "1" : "0"); |
Andres Morales | 1ce7d17 | 2015-01-07 14:24:57 -0800 | [diff] [blame] | 129 | } |
| 130 | |
Amith Yamasani | d2b2104 | 2016-06-03 10:12:47 -0700 | [diff] [blame] | 131 | private void enforceOemUnlockReadPermission() { |
| 132 | if (mContext.checkCallingOrSelfPermission(Manifest.permission.READ_OEM_UNLOCK_STATE) |
| 133 | == PackageManager.PERMISSION_DENIED |
| 134 | && mContext.checkCallingOrSelfPermission(Manifest.permission.OEM_UNLOCK_STATE) |
| 135 | == PackageManager.PERMISSION_DENIED) { |
| 136 | throw new SecurityException("Can't access OEM unlock state. Requires " |
| 137 | + "READ_OEM_UNLOCK_STATE or OEM_UNLOCK_STATE permission."); |
| 138 | } |
| 139 | } |
| 140 | |
| 141 | private void enforceOemUnlockWritePermission() { |
Andres Morales | 68d4acd | 2014-07-01 19:40:41 -0700 | [diff] [blame] | 142 | mContext.enforceCallingOrSelfPermission( |
| 143 | Manifest.permission.OEM_UNLOCK_STATE, |
Amith Yamasani | d2b2104 | 2016-06-03 10:12:47 -0700 | [diff] [blame] | 144 | "Can't modify OEM unlock state"); |
Andres Morales | 68d4acd | 2014-07-01 19:40:41 -0700 | [diff] [blame] | 145 | } |
| 146 | |
| 147 | private void enforceUid(int callingUid) { |
Andres Morales | a31c23d | 2014-10-30 15:31:31 -0700 | [diff] [blame] | 148 | if (callingUid != mAllowedUid) { |
Andres Morales | 68d4acd | 2014-07-01 19:40:41 -0700 | [diff] [blame] | 149 | throw new SecurityException("uid " + callingUid + " not allowed to access PST"); |
| 150 | } |
| 151 | } |
| 152 | |
Xiaohui Chen | f066078 | 2015-09-02 14:25:19 -0700 | [diff] [blame] | 153 | private void enforceIsAdmin() { |
| 154 | final int userId = UserHandle.getCallingUserId(); |
| 155 | final boolean isAdmin = UserManager.get(mContext).isUserAdmin(userId); |
| 156 | if (!isAdmin) { |
| 157 | throw new SecurityException( |
| 158 | "Only the Admin user is allowed to change OEM unlock state"); |
Andres Morales | a31c23d | 2014-10-30 15:31:31 -0700 | [diff] [blame] | 159 | } |
| 160 | } |
Mahaver Chopra | 830e32c | 2016-05-17 18:53:09 +0100 | [diff] [blame] | 161 | |
Mahaver Chopra | 3d9805d | 2016-07-07 16:25:05 +0100 | [diff] [blame] | 162 | private void enforceUserRestriction(String userRestriction) { |
| 163 | if (UserManager.get(mContext).hasUserRestriction(userRestriction)) { |
| 164 | throw new SecurityException( |
| 165 | "OEM unlock is disallowed by user restriction: " + userRestriction); |
Mahaver Chopra | 830e32c | 2016-05-17 18:53:09 +0100 | [diff] [blame] | 166 | } |
| 167 | } |
| 168 | |
Andres Morales | 963295e | 2014-07-10 15:40:24 -0700 | [diff] [blame] | 169 | private int getTotalDataSizeLocked(DataInputStream inputStream) throws IOException { |
Andres Morales | 2830130 | 2014-11-12 07:56:46 -0800 | [diff] [blame] | 170 | // skip over checksum |
| 171 | inputStream.skipBytes(DIGEST_SIZE_BYTES); |
| 172 | |
Andres Morales | 68d4acd | 2014-07-01 19:40:41 -0700 | [diff] [blame] | 173 | int totalDataSize; |
| 174 | int blockId = inputStream.readInt(); |
Andres Morales | 963295e | 2014-07-10 15:40:24 -0700 | [diff] [blame] | 175 | if (blockId == PARTITION_TYPE_MARKER) { |
Andres Morales | 68d4acd | 2014-07-01 19:40:41 -0700 | [diff] [blame] | 176 | totalDataSize = inputStream.readInt(); |
| 177 | } else { |
| 178 | totalDataSize = 0; |
| 179 | } |
| 180 | return totalDataSize; |
| 181 | } |
| 182 | |
Andres Morales | 963295e | 2014-07-10 15:40:24 -0700 | [diff] [blame] | 183 | private long getBlockDeviceSize() { |
| 184 | synchronized (mLock) { |
| 185 | if (mBlockDeviceSize == -1) { |
| 186 | mBlockDeviceSize = nativeGetBlockDeviceSize(mDataBlockFile); |
Andres Morales | 68d4acd | 2014-07-01 19:40:41 -0700 | [diff] [blame] | 187 | } |
| 188 | } |
| 189 | |
| 190 | return mBlockDeviceSize; |
| 191 | } |
| 192 | |
Andres Morales | 2830130 | 2014-11-12 07:56:46 -0800 | [diff] [blame] | 193 | private boolean enforceChecksumValidity() { |
| 194 | byte[] storedDigest = new byte[DIGEST_SIZE_BYTES]; |
| 195 | |
| 196 | synchronized (mLock) { |
| 197 | byte[] digest = computeDigestLocked(storedDigest); |
| 198 | if (digest == null || !Arrays.equals(storedDigest, digest)) { |
| 199 | Slog.i(TAG, "Formatting FRP partition..."); |
Andres Morales | c8f952c | 2015-03-19 08:34:55 -0700 | [diff] [blame] | 200 | formatPartitionLocked(false); |
Andres Morales | 2830130 | 2014-11-12 07:56:46 -0800 | [diff] [blame] | 201 | return false; |
| 202 | } |
| 203 | } |
| 204 | |
| 205 | return true; |
| 206 | } |
| 207 | |
| 208 | private boolean computeAndWriteDigestLocked() { |
| 209 | byte[] digest = computeDigestLocked(null); |
| 210 | if (digest != null) { |
| 211 | DataOutputStream outputStream; |
| 212 | try { |
| 213 | outputStream = new DataOutputStream( |
| 214 | new FileOutputStream(new File(mDataBlockFile))); |
| 215 | } catch (FileNotFoundException e) { |
| 216 | Slog.e(TAG, "partition not available?", e); |
| 217 | return false; |
| 218 | } |
| 219 | |
| 220 | try { |
| 221 | outputStream.write(digest, 0, DIGEST_SIZE_BYTES); |
| 222 | outputStream.flush(); |
| 223 | } catch (IOException e) { |
| 224 | Slog.e(TAG, "failed to write block checksum", e); |
| 225 | return false; |
| 226 | } finally { |
| 227 | IoUtils.closeQuietly(outputStream); |
| 228 | } |
| 229 | return true; |
| 230 | } else { |
| 231 | return false; |
| 232 | } |
| 233 | } |
| 234 | |
| 235 | private byte[] computeDigestLocked(byte[] storedDigest) { |
| 236 | DataInputStream inputStream; |
| 237 | try { |
| 238 | inputStream = new DataInputStream(new FileInputStream(new File(mDataBlockFile))); |
| 239 | } catch (FileNotFoundException e) { |
| 240 | Slog.e(TAG, "partition not available?", e); |
| 241 | return null; |
| 242 | } |
| 243 | |
| 244 | MessageDigest md; |
| 245 | try { |
| 246 | md = MessageDigest.getInstance("SHA-256"); |
| 247 | } catch (NoSuchAlgorithmException e) { |
| 248 | // won't ever happen -- every implementation is required to support SHA-256 |
| 249 | Slog.e(TAG, "SHA-256 not supported?", e); |
| 250 | IoUtils.closeQuietly(inputStream); |
| 251 | return null; |
| 252 | } |
| 253 | |
| 254 | try { |
| 255 | if (storedDigest != null && storedDigest.length == DIGEST_SIZE_BYTES) { |
| 256 | inputStream.read(storedDigest); |
| 257 | } else { |
| 258 | inputStream.skipBytes(DIGEST_SIZE_BYTES); |
| 259 | } |
| 260 | |
| 261 | int read; |
| 262 | byte[] data = new byte[1024]; |
| 263 | md.update(data, 0, DIGEST_SIZE_BYTES); // include 0 checksum in digest |
| 264 | while ((read = inputStream.read(data)) != -1) { |
| 265 | md.update(data, 0, read); |
| 266 | } |
| 267 | } catch (IOException e) { |
| 268 | Slog.e(TAG, "failed to read partition", e); |
| 269 | return null; |
| 270 | } finally { |
| 271 | IoUtils.closeQuietly(inputStream); |
| 272 | } |
| 273 | |
| 274 | return md.digest(); |
| 275 | } |
| 276 | |
Andres Morales | c8f952c | 2015-03-19 08:34:55 -0700 | [diff] [blame] | 277 | private void formatPartitionLocked(boolean setOemUnlockEnabled) { |
Andres Morales | 2830130 | 2014-11-12 07:56:46 -0800 | [diff] [blame] | 278 | DataOutputStream outputStream; |
| 279 | try { |
| 280 | outputStream = new DataOutputStream(new FileOutputStream(new File(mDataBlockFile))); |
| 281 | } catch (FileNotFoundException e) { |
| 282 | Slog.e(TAG, "partition not available?", e); |
| 283 | return; |
| 284 | } |
| 285 | |
| 286 | byte[] data = new byte[DIGEST_SIZE_BYTES]; |
| 287 | try { |
| 288 | outputStream.write(data, 0, DIGEST_SIZE_BYTES); |
| 289 | outputStream.writeInt(PARTITION_TYPE_MARKER); |
| 290 | outputStream.writeInt(0); // data size |
| 291 | outputStream.flush(); |
| 292 | } catch (IOException e) { |
| 293 | Slog.e(TAG, "failed to format block", e); |
| 294 | return; |
| 295 | } finally { |
| 296 | IoUtils.closeQuietly(outputStream); |
| 297 | } |
| 298 | |
Andres Morales | c8f952c | 2015-03-19 08:34:55 -0700 | [diff] [blame] | 299 | doSetOemUnlockEnabledLocked(setOemUnlockEnabled); |
Andres Morales | 2830130 | 2014-11-12 07:56:46 -0800 | [diff] [blame] | 300 | computeAndWriteDigestLocked(); |
| 301 | } |
| 302 | |
| 303 | private void doSetOemUnlockEnabledLocked(boolean enabled) { |
| 304 | FileOutputStream outputStream; |
| 305 | try { |
| 306 | outputStream = new FileOutputStream(new File(mDataBlockFile)); |
| 307 | } catch (FileNotFoundException e) { |
| 308 | Slog.e(TAG, "partition not available", e); |
| 309 | return; |
| 310 | } |
| 311 | |
| 312 | try { |
| 313 | FileChannel channel = outputStream.getChannel(); |
| 314 | |
| 315 | channel.position(getBlockDeviceSize() - 1); |
| 316 | |
| 317 | ByteBuffer data = ByteBuffer.allocate(1); |
| 318 | data.put(enabled ? (byte) 1 : (byte) 0); |
| 319 | data.flip(); |
| 320 | channel.write(data); |
| 321 | outputStream.flush(); |
| 322 | } catch (IOException e) { |
| 323 | Slog.e(TAG, "unable to access persistent partition", e); |
| 324 | return; |
| 325 | } finally { |
Andres Morales | 5ca4cc5 | 2015-03-19 16:37:54 -0700 | [diff] [blame] | 326 | SystemProperties.set(OEM_UNLOCK_PROP, enabled ? "1" : "0"); |
Andres Morales | 2830130 | 2014-11-12 07:56:46 -0800 | [diff] [blame] | 327 | IoUtils.closeQuietly(outputStream); |
| 328 | } |
| 329 | } |
| 330 | |
Andres Morales | 1ce7d17 | 2015-01-07 14:24:57 -0800 | [diff] [blame] | 331 | private boolean doGetOemUnlockEnabled() { |
| 332 | DataInputStream inputStream; |
| 333 | try { |
| 334 | inputStream = new DataInputStream(new FileInputStream(new File(mDataBlockFile))); |
| 335 | } catch (FileNotFoundException e) { |
| 336 | Slog.e(TAG, "partition not available"); |
| 337 | return false; |
| 338 | } |
| 339 | |
| 340 | try { |
| 341 | synchronized (mLock) { |
| 342 | inputStream.skip(getBlockDeviceSize() - 1); |
| 343 | return inputStream.readByte() != 0; |
| 344 | } |
| 345 | } catch (IOException e) { |
| 346 | Slog.e(TAG, "unable to access persistent partition", e); |
| 347 | return false; |
| 348 | } finally { |
| 349 | IoUtils.closeQuietly(inputStream); |
| 350 | } |
| 351 | } |
| 352 | |
Andres Morales | 963295e | 2014-07-10 15:40:24 -0700 | [diff] [blame] | 353 | private native long nativeGetBlockDeviceSize(String path); |
| 354 | private native int nativeWipe(String path); |
Andres Morales | 68d4acd | 2014-07-01 19:40:41 -0700 | [diff] [blame] | 355 | |
| 356 | private final IBinder mService = new IPersistentDataBlockService.Stub() { |
| 357 | @Override |
| 358 | public int write(byte[] data) throws RemoteException { |
| 359 | enforceUid(Binder.getCallingUid()); |
| 360 | |
| 361 | // Need to ensure we don't write over the last byte |
Andres Morales | 963295e | 2014-07-10 15:40:24 -0700 | [diff] [blame] | 362 | long maxBlockSize = getBlockDeviceSize() - HEADER_SIZE - 1; |
| 363 | if (data.length > maxBlockSize) { |
| 364 | // partition is ~500k so shouldn't be a problem to downcast |
| 365 | return (int) -maxBlockSize; |
Andres Morales | 68d4acd | 2014-07-01 19:40:41 -0700 | [diff] [blame] | 366 | } |
| 367 | |
| 368 | DataOutputStream outputStream; |
| 369 | try { |
| 370 | outputStream = new DataOutputStream(new FileOutputStream(new File(mDataBlockFile))); |
| 371 | } catch (FileNotFoundException e) { |
Andres Morales | 963295e | 2014-07-10 15:40:24 -0700 | [diff] [blame] | 372 | Slog.e(TAG, "partition not available?", e); |
Andres Morales | 68d4acd | 2014-07-01 19:40:41 -0700 | [diff] [blame] | 373 | return -1; |
| 374 | } |
| 375 | |
| 376 | ByteBuffer headerAndData = ByteBuffer.allocate(data.length + HEADER_SIZE); |
Andres Morales | 963295e | 2014-07-10 15:40:24 -0700 | [diff] [blame] | 377 | headerAndData.putInt(PARTITION_TYPE_MARKER); |
Andres Morales | 68d4acd | 2014-07-01 19:40:41 -0700 | [diff] [blame] | 378 | headerAndData.putInt(data.length); |
| 379 | headerAndData.put(data); |
| 380 | |
Andres Morales | 2830130 | 2014-11-12 07:56:46 -0800 | [diff] [blame] | 381 | synchronized (mLock) { |
Charles He | a629c77 | 2016-11-24 14:05:00 +0000 | [diff] [blame] | 382 | if (!mIsWritable) { |
| 383 | IoUtils.closeQuietly(outputStream); |
| 384 | return -1; |
| 385 | } |
| 386 | |
Andres Morales | 68d4acd | 2014-07-01 19:40:41 -0700 | [diff] [blame] | 387 | try { |
Andres Morales | 2830130 | 2014-11-12 07:56:46 -0800 | [diff] [blame] | 388 | byte[] checksum = new byte[DIGEST_SIZE_BYTES]; |
| 389 | outputStream.write(checksum, 0, DIGEST_SIZE_BYTES); |
| 390 | outputStream.write(headerAndData.array()); |
| 391 | outputStream.flush(); |
Andres Morales | 68d4acd | 2014-07-01 19:40:41 -0700 | [diff] [blame] | 392 | } catch (IOException e) { |
Andres Morales | 2830130 | 2014-11-12 07:56:46 -0800 | [diff] [blame] | 393 | Slog.e(TAG, "failed writing to the persistent data block", e); |
| 394 | return -1; |
| 395 | } finally { |
| 396 | IoUtils.closeQuietly(outputStream); |
| 397 | } |
| 398 | |
| 399 | if (computeAndWriteDigestLocked()) { |
| 400 | return data.length; |
| 401 | } else { |
| 402 | return -1; |
Andres Morales | 68d4acd | 2014-07-01 19:40:41 -0700 | [diff] [blame] | 403 | } |
| 404 | } |
| 405 | } |
| 406 | |
| 407 | @Override |
Andres Morales | 963295e | 2014-07-10 15:40:24 -0700 | [diff] [blame] | 408 | public byte[] read() { |
Andres Morales | 68d4acd | 2014-07-01 19:40:41 -0700 | [diff] [blame] | 409 | enforceUid(Binder.getCallingUid()); |
Andres Morales | 2830130 | 2014-11-12 07:56:46 -0800 | [diff] [blame] | 410 | if (!enforceChecksumValidity()) { |
| 411 | return new byte[0]; |
| 412 | } |
Andres Morales | 68d4acd | 2014-07-01 19:40:41 -0700 | [diff] [blame] | 413 | |
| 414 | DataInputStream inputStream; |
| 415 | try { |
| 416 | inputStream = new DataInputStream(new FileInputStream(new File(mDataBlockFile))); |
| 417 | } catch (FileNotFoundException e) { |
Andres Morales | 963295e | 2014-07-10 15:40:24 -0700 | [diff] [blame] | 418 | Slog.e(TAG, "partition not available?", e); |
| 419 | return null; |
Andres Morales | 68d4acd | 2014-07-01 19:40:41 -0700 | [diff] [blame] | 420 | } |
| 421 | |
| 422 | try { |
Andres Morales | 963295e | 2014-07-10 15:40:24 -0700 | [diff] [blame] | 423 | synchronized (mLock) { |
| 424 | int totalDataSize = getTotalDataSizeLocked(inputStream); |
| 425 | |
| 426 | if (totalDataSize == 0) { |
| 427 | return new byte[0]; |
| 428 | } |
| 429 | |
| 430 | byte[] data = new byte[totalDataSize]; |
| 431 | int read = inputStream.read(data, 0, totalDataSize); |
| 432 | if (read < totalDataSize) { |
| 433 | // something went wrong, not returning potentially corrupt data |
| 434 | Slog.e(TAG, "failed to read entire data block. bytes read: " + |
| 435 | read + "/" + totalDataSize); |
| 436 | return null; |
| 437 | } |
| 438 | return data; |
| 439 | } |
Andres Morales | 68d4acd | 2014-07-01 19:40:41 -0700 | [diff] [blame] | 440 | } catch (IOException e) { |
Andres Morales | 963295e | 2014-07-10 15:40:24 -0700 | [diff] [blame] | 441 | Slog.e(TAG, "failed to read data", e); |
| 442 | return null; |
Andres Morales | 68d4acd | 2014-07-01 19:40:41 -0700 | [diff] [blame] | 443 | } finally { |
| 444 | try { |
| 445 | inputStream.close(); |
| 446 | } catch (IOException e) { |
Andres Morales | 963295e | 2014-07-10 15:40:24 -0700 | [diff] [blame] | 447 | Slog.e(TAG, "failed to close OutputStream"); |
| 448 | } |
| 449 | } |
| 450 | } |
| 451 | |
| 452 | @Override |
| 453 | public void wipe() { |
Amith Yamasani | d2b2104 | 2016-06-03 10:12:47 -0700 | [diff] [blame] | 454 | enforceOemUnlockWritePermission(); |
Andres Morales | 963295e | 2014-07-10 15:40:24 -0700 | [diff] [blame] | 455 | |
| 456 | synchronized (mLock) { |
| 457 | int ret = nativeWipe(mDataBlockFile); |
| 458 | |
| 459 | if (ret < 0) { |
| 460 | Slog.e(TAG, "failed to wipe persistent partition"); |
Charles He | a629c77 | 2016-11-24 14:05:00 +0000 | [diff] [blame] | 461 | } else { |
| 462 | mIsWritable = false; |
| 463 | Slog.i(TAG, "persistent partition now wiped and unwritable"); |
Andres Morales | 68d4acd | 2014-07-01 19:40:41 -0700 | [diff] [blame] | 464 | } |
| 465 | } |
| 466 | } |
| 467 | |
| 468 | @Override |
Steven Ng | dc20ba6 | 2016-04-26 18:19:04 +0100 | [diff] [blame] | 469 | public void setOemUnlockEnabled(boolean enabled) throws SecurityException { |
Guang Zhu | 514c580 | 2014-09-12 15:14:00 -0700 | [diff] [blame] | 470 | // do not allow monkey to flip the flag |
| 471 | if (ActivityManager.isUserAMonkey()) { |
| 472 | return; |
| 473 | } |
Steven Ng | bfe1b04 | 2016-05-16 11:20:57 +0100 | [diff] [blame] | 474 | |
Amith Yamasani | d2b2104 | 2016-06-03 10:12:47 -0700 | [diff] [blame] | 475 | enforceOemUnlockWritePermission(); |
Steven Ng | bfe1b04 | 2016-05-16 11:20:57 +0100 | [diff] [blame] | 476 | enforceIsAdmin(); |
| 477 | |
Mahaver Chopra | 830e32c | 2016-05-17 18:53:09 +0100 | [diff] [blame] | 478 | if (enabled) { |
Mahaver Chopra | 3d9805d | 2016-07-07 16:25:05 +0100 | [diff] [blame] | 479 | // Do not allow oem unlock to be enabled if it's disallowed by a user restriction. |
| 480 | enforceUserRestriction(UserManager.DISALLOW_OEM_UNLOCK); |
| 481 | enforceUserRestriction(UserManager.DISALLOW_FACTORY_RESET); |
Mahaver Chopra | 830e32c | 2016-05-17 18:53:09 +0100 | [diff] [blame] | 482 | } |
Andres Morales | 2830130 | 2014-11-12 07:56:46 -0800 | [diff] [blame] | 483 | synchronized (mLock) { |
| 484 | doSetOemUnlockEnabledLocked(enabled); |
| 485 | computeAndWriteDigestLocked(); |
Andres Morales | 68d4acd | 2014-07-01 19:40:41 -0700 | [diff] [blame] | 486 | } |
| 487 | } |
| 488 | |
| 489 | @Override |
| 490 | public boolean getOemUnlockEnabled() { |
Amith Yamasani | d2b2104 | 2016-06-03 10:12:47 -0700 | [diff] [blame] | 491 | enforceOemUnlockReadPermission(); |
Andres Morales | 1ce7d17 | 2015-01-07 14:24:57 -0800 | [diff] [blame] | 492 | return doGetOemUnlockEnabled(); |
Andres Morales | 68d4acd | 2014-07-01 19:40:41 -0700 | [diff] [blame] | 493 | } |
| 494 | |
| 495 | @Override |
Andres Morales | 74e9b18 | 2016-02-22 12:33:33 -0800 | [diff] [blame] | 496 | public int getFlashLockState() { |
Amith Yamasani | d2b2104 | 2016-06-03 10:12:47 -0700 | [diff] [blame] | 497 | enforceOemUnlockReadPermission(); |
Andres Morales | 74e9b18 | 2016-02-22 12:33:33 -0800 | [diff] [blame] | 498 | String locked = SystemProperties.get(FLASH_LOCK_PROP); |
| 499 | switch (locked) { |
| 500 | case FLASH_LOCK_LOCKED: |
| 501 | return PersistentDataBlockManager.FLASH_LOCK_LOCKED; |
| 502 | case FLASH_LOCK_UNLOCKED: |
| 503 | return PersistentDataBlockManager.FLASH_LOCK_UNLOCKED; |
| 504 | default: |
| 505 | return PersistentDataBlockManager.FLASH_LOCK_UNKNOWN; |
| 506 | } |
| 507 | } |
| 508 | |
| 509 | @Override |
Andres Morales | 68d4acd | 2014-07-01 19:40:41 -0700 | [diff] [blame] | 510 | public int getDataBlockSize() { |
Craig Lafayette | 66445a6 | 2015-03-27 09:01:43 -0400 | [diff] [blame] | 511 | enforcePersistentDataBlockAccess(); |
Andres Morales | 68d4acd | 2014-07-01 19:40:41 -0700 | [diff] [blame] | 512 | |
| 513 | DataInputStream inputStream; |
| 514 | try { |
| 515 | inputStream = new DataInputStream(new FileInputStream(new File(mDataBlockFile))); |
| 516 | } catch (FileNotFoundException e) { |
Andres Morales | 963295e | 2014-07-10 15:40:24 -0700 | [diff] [blame] | 517 | Slog.e(TAG, "partition not available"); |
Andres Morales | 68d4acd | 2014-07-01 19:40:41 -0700 | [diff] [blame] | 518 | return 0; |
| 519 | } |
| 520 | |
| 521 | try { |
Andres Morales | 963295e | 2014-07-10 15:40:24 -0700 | [diff] [blame] | 522 | synchronized (mLock) { |
| 523 | return getTotalDataSizeLocked(inputStream); |
| 524 | } |
Andres Morales | 68d4acd | 2014-07-01 19:40:41 -0700 | [diff] [blame] | 525 | } catch (IOException e) { |
Andres Morales | 963295e | 2014-07-10 15:40:24 -0700 | [diff] [blame] | 526 | Slog.e(TAG, "error reading data block size"); |
Andres Morales | 68d4acd | 2014-07-01 19:40:41 -0700 | [diff] [blame] | 527 | return 0; |
| 528 | } finally { |
Andres Morales | 963295e | 2014-07-10 15:40:24 -0700 | [diff] [blame] | 529 | IoUtils.closeQuietly(inputStream); |
Andres Morales | 68d4acd | 2014-07-01 19:40:41 -0700 | [diff] [blame] | 530 | } |
| 531 | } |
Andres Morales | 963295e | 2014-07-10 15:40:24 -0700 | [diff] [blame] | 532 | |
Craig Lafayette | 66445a6 | 2015-03-27 09:01:43 -0400 | [diff] [blame] | 533 | private void enforcePersistentDataBlockAccess() { |
| 534 | if (mContext.checkCallingPermission(Manifest.permission.ACCESS_PDB_STATE) |
| 535 | != PackageManager.PERMISSION_GRANTED) { |
| 536 | enforceUid(Binder.getCallingUid()); |
| 537 | } |
| 538 | } |
| 539 | |
Andres Morales | 963295e | 2014-07-10 15:40:24 -0700 | [diff] [blame] | 540 | @Override |
| 541 | public long getMaximumDataBlockSize() { |
| 542 | long actualSize = getBlockDeviceSize() - HEADER_SIZE - 1; |
| 543 | return actualSize <= MAX_DATA_BLOCK_SIZE ? actualSize : MAX_DATA_BLOCK_SIZE; |
| 544 | } |
Andres Morales | 68d4acd | 2014-07-01 19:40:41 -0700 | [diff] [blame] | 545 | }; |
| 546 | } |