Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2010 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 | /* TO DO: |
| 18 | * 1. Perhaps keep several copies of the encrypted key, in case something |
| 19 | * goes horribly wrong? |
| 20 | * |
| 21 | */ |
| 22 | |
| 23 | #include <sys/types.h> |
Ken Sumrall | e550f78 | 2013-08-20 13:48:23 -0700 | [diff] [blame] | 24 | #include <sys/wait.h> |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 25 | #include <sys/stat.h> |
Paul Lawrence | f4faa57 | 2014-01-29 13:31:03 -0800 | [diff] [blame] | 26 | #include <ctype.h> |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 27 | #include <fcntl.h> |
Elliott Hughes | 7373716 | 2014-06-25 17:27:42 -0700 | [diff] [blame] | 28 | #include <inttypes.h> |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 29 | #include <unistd.h> |
| 30 | #include <stdio.h> |
| 31 | #include <sys/ioctl.h> |
| 32 | #include <linux/dm-ioctl.h> |
| 33 | #include <libgen.h> |
| 34 | #include <stdlib.h> |
| 35 | #include <sys/param.h> |
| 36 | #include <string.h> |
| 37 | #include <sys/mount.h> |
| 38 | #include <openssl/evp.h> |
| 39 | #include <errno.h> |
Ken Sumrall | 3ed8236 | 2011-01-28 23:31:16 -0800 | [diff] [blame] | 40 | #include <ext4.h> |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 41 | #include <linux/kdev_t.h> |
Ken Sumrall | e5032c4 | 2012-04-01 23:58:44 -0700 | [diff] [blame] | 42 | #include <fs_mgr.h> |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 43 | #include "cryptfs.h" |
| 44 | #define LOG_TAG "Cryptfs" |
| 45 | #include "cutils/log.h" |
| 46 | #include "cutils/properties.h" |
Ken Sumrall | adfba36 | 2013-06-04 16:37:52 -0700 | [diff] [blame] | 47 | #include "cutils/android_reboot.h" |
Ken Sumrall | 5d4c68e | 2011-01-30 19:06:03 -0800 | [diff] [blame] | 48 | #include "hardware_legacy/power.h" |
Ken Sumrall | e550f78 | 2013-08-20 13:48:23 -0700 | [diff] [blame] | 49 | #include <logwrap/logwrap.h> |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 50 | #include "VolumeManager.h" |
Ken Sumrall | 9caab76 | 2013-06-11 19:10:20 -0700 | [diff] [blame] | 51 | #include "VoldUtil.h" |
Kenny Root | c4c70f1 | 2013-06-14 12:11:38 -0700 | [diff] [blame] | 52 | #include "crypto_scrypt.h" |
Paul Lawrence | ae59fe6 | 2014-01-21 08:23:27 -0800 | [diff] [blame] | 53 | #include "ext4_utils.h" |
Paul Lawrence | 8799917 | 2014-02-20 12:21:31 -0800 | [diff] [blame] | 54 | #include "CheckBattery.h" |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 55 | |
Paul Lawrence | 69f4ebd | 2014-04-14 12:17:14 -0700 | [diff] [blame] | 56 | #include <hardware/keymaster.h> |
| 57 | |
Mark Salyzyn | 3e97127 | 2014-01-21 13:27:04 -0800 | [diff] [blame] | 58 | #define UNUSED __attribute__((unused)) |
| 59 | |
Mark Salyzyn | 5eecc44 | 2014-02-12 14:16:14 -0800 | [diff] [blame] | 60 | #define UNUSED __attribute__((unused)) |
| 61 | |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 62 | #define DM_CRYPT_BUF_SIZE 4096 |
| 63 | |
Jason parks | 70a4b3f | 2011-01-28 10:10:47 -0600 | [diff] [blame] | 64 | #define HASH_COUNT 2000 |
| 65 | #define KEY_LEN_BYTES 16 |
| 66 | #define IV_LEN_BYTES 16 |
| 67 | |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 68 | #define KEY_IN_FOOTER "footer" |
| 69 | |
Paul Lawrence | f4faa57 | 2014-01-29 13:31:03 -0800 | [diff] [blame] | 70 | // "default_password" encoded into hex (d=0x64 etc) |
| 71 | #define DEFAULT_PASSWORD "64656661756c745f70617373776f7264" |
| 72 | |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 73 | #define EXT4_FS 1 |
JP Abgrall | 62c7af3 | 2014-06-16 13:01:23 -0700 | [diff] [blame] | 74 | #define F2FS_FS 2 |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 75 | |
Ken Sumrall | e919efe | 2012-09-29 17:07:41 -0700 | [diff] [blame] | 76 | #define TABLE_LOAD_RETRIES 10 |
| 77 | |
Paul Lawrence | 69f4ebd | 2014-04-14 12:17:14 -0700 | [diff] [blame] | 78 | #define RSA_DEFAULT_KEY_SIZE 2048 |
| 79 | #define RSA_DEFAULT_EXPONENT 0x10001 |
| 80 | |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 81 | char *me = "cryptfs"; |
| 82 | |
Jason parks | 70a4b3f | 2011-01-28 10:10:47 -0600 | [diff] [blame] | 83 | static unsigned char saved_master_key[KEY_LEN_BYTES]; |
Ken Sumrall | 3ad9072 | 2011-10-04 20:38:29 -0700 | [diff] [blame] | 84 | static char *saved_mount_point; |
Jason parks | 70a4b3f | 2011-01-28 10:10:47 -0600 | [diff] [blame] | 85 | static int master_key_saved = 0; |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 86 | static struct crypt_persist_data *persist_data = NULL; |
Ken Sumrall | 56ad03c | 2013-02-13 13:00:19 -0800 | [diff] [blame] | 87 | |
Paul Lawrence | 69f4ebd | 2014-04-14 12:17:14 -0700 | [diff] [blame] | 88 | static int keymaster_init(keymaster_device_t **keymaster_dev) |
| 89 | { |
| 90 | int rc; |
| 91 | |
| 92 | const hw_module_t* mod; |
| 93 | rc = hw_get_module_by_class(KEYSTORE_HARDWARE_MODULE_ID, NULL, &mod); |
| 94 | if (rc) { |
| 95 | ALOGE("could not find any keystore module"); |
| 96 | goto out; |
| 97 | } |
| 98 | |
| 99 | rc = keymaster_open(mod, keymaster_dev); |
| 100 | if (rc) { |
| 101 | ALOGE("could not open keymaster device in %s (%s)", |
| 102 | KEYSTORE_HARDWARE_MODULE_ID, strerror(-rc)); |
| 103 | goto out; |
| 104 | } |
| 105 | |
| 106 | return 0; |
| 107 | |
| 108 | out: |
| 109 | *keymaster_dev = NULL; |
| 110 | return rc; |
| 111 | } |
| 112 | |
| 113 | /* Should we use keymaster? */ |
| 114 | static int keymaster_check_compatibility() |
| 115 | { |
| 116 | keymaster_device_t *keymaster_dev = 0; |
| 117 | int rc = 0; |
| 118 | |
| 119 | if (keymaster_init(&keymaster_dev)) { |
| 120 | SLOGE("Failed to init keymaster"); |
| 121 | rc = -1; |
| 122 | goto out; |
| 123 | } |
| 124 | |
Paul Lawrence | 8c00839 | 2014-05-06 14:02:48 -0700 | [diff] [blame] | 125 | SLOGI("keymaster version is %d", keymaster_dev->common.module->module_api_version); |
| 126 | |
| 127 | if (keymaster_dev->common.module->module_api_version |
| 128 | < KEYMASTER_MODULE_API_VERSION_0_3) { |
| 129 | rc = 0; |
| 130 | goto out; |
| 131 | } |
| 132 | |
Paul Lawrence | 69f4ebd | 2014-04-14 12:17:14 -0700 | [diff] [blame] | 133 | if (keymaster_dev->flags & KEYMASTER_BLOBS_ARE_STANDALONE) { |
| 134 | rc = 1; |
| 135 | } |
| 136 | |
| 137 | out: |
| 138 | keymaster_close(keymaster_dev); |
| 139 | return rc; |
| 140 | } |
| 141 | |
| 142 | /* Create a new keymaster key and store it in this footer */ |
| 143 | static int keymaster_create_key(struct crypt_mnt_ftr *ftr) |
| 144 | { |
| 145 | uint8_t* key = 0; |
| 146 | keymaster_device_t *keymaster_dev = 0; |
| 147 | |
| 148 | if (keymaster_init(&keymaster_dev)) { |
| 149 | SLOGE("Failed to init keymaster"); |
| 150 | return -1; |
| 151 | } |
| 152 | |
| 153 | int rc = 0; |
| 154 | |
| 155 | keymaster_rsa_keygen_params_t params; |
| 156 | memset(¶ms, '\0', sizeof(params)); |
| 157 | params.public_exponent = RSA_DEFAULT_EXPONENT; |
| 158 | params.modulus_size = RSA_DEFAULT_KEY_SIZE; |
| 159 | |
| 160 | size_t key_size; |
| 161 | if (keymaster_dev->generate_keypair(keymaster_dev, TYPE_RSA, ¶ms, |
| 162 | &key, &key_size)) { |
| 163 | SLOGE("Failed to generate keypair"); |
| 164 | rc = -1; |
| 165 | goto out; |
| 166 | } |
| 167 | |
| 168 | if (key_size > KEYMASTER_BLOB_SIZE) { |
| 169 | SLOGE("Keymaster key too large for crypto footer"); |
| 170 | rc = -1; |
| 171 | goto out; |
| 172 | } |
| 173 | |
| 174 | memcpy(ftr->keymaster_blob, key, key_size); |
| 175 | ftr->keymaster_blob_size = key_size; |
| 176 | |
| 177 | out: |
| 178 | keymaster_close(keymaster_dev); |
| 179 | free(key); |
| 180 | return rc; |
| 181 | } |
| 182 | |
| 183 | /* This signs the given object using the keymaster key */ |
| 184 | static int keymaster_sign_object(struct crypt_mnt_ftr *ftr, |
| 185 | const unsigned char *object, |
| 186 | const size_t object_size, |
| 187 | unsigned char **signature, |
| 188 | size_t *signature_size) |
| 189 | { |
| 190 | int rc = 0; |
| 191 | keymaster_device_t *keymaster_dev = 0; |
| 192 | if (keymaster_init(&keymaster_dev)) { |
| 193 | SLOGE("Failed to init keymaster"); |
| 194 | return -1; |
| 195 | } |
| 196 | |
| 197 | /* We currently set the digest type to DIGEST_NONE because it's the |
| 198 | * only supported value for keymaster. A similar issue exists with |
| 199 | * PADDING_NONE. Long term both of these should likely change. |
| 200 | */ |
| 201 | keymaster_rsa_sign_params_t params; |
| 202 | params.digest_type = DIGEST_NONE; |
| 203 | params.padding_type = PADDING_NONE; |
| 204 | |
| 205 | rc = keymaster_dev->sign_data(keymaster_dev, |
| 206 | ¶ms, |
| 207 | ftr->keymaster_blob, |
| 208 | ftr->keymaster_blob_size, |
| 209 | object, |
| 210 | object_size, |
| 211 | signature, |
| 212 | signature_size); |
| 213 | |
| 214 | keymaster_close(keymaster_dev); |
| 215 | return rc; |
| 216 | } |
| 217 | |
Paul Lawrence | 399317e | 2014-03-10 13:20:50 -0700 | [diff] [blame] | 218 | /* Store password when userdata is successfully decrypted and mounted. |
| 219 | * Cleared by cryptfs_clear_password |
| 220 | * |
| 221 | * To avoid a double prompt at boot, we need to store the CryptKeeper |
| 222 | * password and pass it to KeyGuard, which uses it to unlock KeyStore. |
| 223 | * Since the entire framework is torn down and rebuilt after encryption, |
| 224 | * we have to use a daemon or similar to store the password. Since vold |
| 225 | * is secured against IPC except from system processes, it seems a reasonable |
| 226 | * place to store this. |
| 227 | * |
| 228 | * password should be cleared once it has been used. |
| 229 | * |
| 230 | * password is aged out after password_max_age_seconds seconds. |
Paul Lawrence | 684dbdf | 2014-02-07 12:07:22 -0800 | [diff] [blame] | 231 | */ |
Paul Lawrence | 399317e | 2014-03-10 13:20:50 -0700 | [diff] [blame] | 232 | static char* password = 0; |
| 233 | static int password_expiry_time = 0; |
| 234 | static const int password_max_age_seconds = 60; |
Paul Lawrence | 684dbdf | 2014-02-07 12:07:22 -0800 | [diff] [blame] | 235 | |
Ken Sumrall | 56ad03c | 2013-02-13 13:00:19 -0800 | [diff] [blame] | 236 | extern struct fstab *fstab; |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 237 | |
Paul Lawrence | 8799917 | 2014-02-20 12:21:31 -0800 | [diff] [blame] | 238 | enum RebootType {reboot, recovery, shutdown}; |
| 239 | static void cryptfs_reboot(enum RebootType rt) |
Ken Sumrall | adfba36 | 2013-06-04 16:37:52 -0700 | [diff] [blame] | 240 | { |
Paul Lawrence | 8799917 | 2014-02-20 12:21:31 -0800 | [diff] [blame] | 241 | switch(rt) { |
| 242 | case reboot: |
| 243 | property_set(ANDROID_RB_PROPERTY, "reboot"); |
| 244 | break; |
| 245 | |
| 246 | case recovery: |
| 247 | property_set(ANDROID_RB_PROPERTY, "reboot,recovery"); |
| 248 | break; |
| 249 | |
| 250 | case shutdown: |
| 251 | property_set(ANDROID_RB_PROPERTY, "shutdown"); |
| 252 | break; |
Ken Sumrall | adfba36 | 2013-06-04 16:37:52 -0700 | [diff] [blame] | 253 | } |
Paul Lawrence | 8799917 | 2014-02-20 12:21:31 -0800 | [diff] [blame] | 254 | |
Ken Sumrall | adfba36 | 2013-06-04 16:37:52 -0700 | [diff] [blame] | 255 | sleep(20); |
| 256 | |
| 257 | /* Shouldn't get here, reboot should happen before sleep times out */ |
| 258 | return; |
| 259 | } |
| 260 | |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 261 | static void ioctl_init(struct dm_ioctl *io, size_t dataSize, const char *name, unsigned flags) |
| 262 | { |
| 263 | memset(io, 0, dataSize); |
| 264 | io->data_size = dataSize; |
| 265 | io->data_start = sizeof(struct dm_ioctl); |
| 266 | io->version[0] = 4; |
| 267 | io->version[1] = 0; |
| 268 | io->version[2] = 0; |
| 269 | io->flags = flags; |
| 270 | if (name) { |
| 271 | strncpy(io->name, name, sizeof(io->name)); |
| 272 | } |
| 273 | } |
| 274 | |
Kenny Root | c4c70f1 | 2013-06-14 12:11:38 -0700 | [diff] [blame] | 275 | /** |
| 276 | * Gets the default device scrypt parameters for key derivation time tuning. |
| 277 | * The parameters should lead to about one second derivation time for the |
| 278 | * given device. |
| 279 | */ |
| 280 | static void get_device_scrypt_params(struct crypt_mnt_ftr *ftr) { |
| 281 | const int default_params[] = SCRYPT_DEFAULTS; |
| 282 | int params[] = SCRYPT_DEFAULTS; |
| 283 | char paramstr[PROPERTY_VALUE_MAX]; |
| 284 | char *token; |
| 285 | char *saveptr; |
| 286 | int i; |
| 287 | |
| 288 | property_get(SCRYPT_PROP, paramstr, ""); |
| 289 | if (paramstr[0] != '\0') { |
| 290 | /* |
| 291 | * The token we're looking for should be three integers separated by |
| 292 | * colons (e.g., "12:8:1"). Scan the property to make sure it matches. |
| 293 | */ |
Kenny Root | 2947e34 | 2013-08-14 15:54:49 -0700 | [diff] [blame] | 294 | for (i = 0, token = strtok_r(paramstr, ":", &saveptr); |
| 295 | token != NULL && i < 3; |
Kenny Root | c4c70f1 | 2013-06-14 12:11:38 -0700 | [diff] [blame] | 296 | i++, token = strtok_r(NULL, ":", &saveptr)) { |
| 297 | char *endptr; |
| 298 | params[i] = strtol(token, &endptr, 10); |
| 299 | |
| 300 | /* |
| 301 | * Check that there was a valid number and it's 8-bit. If not, |
| 302 | * break out and the end check will take the default values. |
| 303 | */ |
| 304 | if ((*token == '\0') || (*endptr != '\0') || params[i] < 0 || params[i] > 255) { |
| 305 | break; |
| 306 | } |
| 307 | } |
| 308 | |
| 309 | /* |
| 310 | * If there were not enough tokens or a token was malformed (not an |
| 311 | * integer), it will end up here and the default parameters can be |
| 312 | * taken. |
| 313 | */ |
| 314 | if ((i != 3) || (token != NULL)) { |
| 315 | SLOGW("bad scrypt parameters '%s' should be like '12:8:1'; using defaults", paramstr); |
| 316 | memcpy(params, default_params, sizeof(params)); |
| 317 | } |
| 318 | } |
| 319 | |
| 320 | ftr->N_factor = params[0]; |
| 321 | ftr->r_factor = params[1]; |
| 322 | ftr->p_factor = params[2]; |
| 323 | } |
| 324 | |
Ken Sumrall | 3ed8236 | 2011-01-28 23:31:16 -0800 | [diff] [blame] | 325 | static unsigned int get_fs_size(char *dev) |
| 326 | { |
| 327 | int fd, block_size; |
| 328 | struct ext4_super_block sb; |
| 329 | off64_t len; |
| 330 | |
| 331 | if ((fd = open(dev, O_RDONLY)) < 0) { |
| 332 | SLOGE("Cannot open device to get filesystem size "); |
| 333 | return 0; |
| 334 | } |
| 335 | |
| 336 | if (lseek64(fd, 1024, SEEK_SET) < 0) { |
| 337 | SLOGE("Cannot seek to superblock"); |
| 338 | return 0; |
| 339 | } |
| 340 | |
| 341 | if (read(fd, &sb, sizeof(sb)) != sizeof(sb)) { |
| 342 | SLOGE("Cannot read superblock"); |
| 343 | return 0; |
| 344 | } |
| 345 | |
| 346 | close(fd); |
| 347 | |
| 348 | block_size = 1024 << sb.s_log_block_size; |
| 349 | /* compute length in bytes */ |
| 350 | len = ( ((off64_t)sb.s_blocks_count_hi << 32) + sb.s_blocks_count_lo) * block_size; |
| 351 | |
| 352 | /* return length in sectors */ |
| 353 | return (unsigned int) (len / 512); |
| 354 | } |
| 355 | |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 356 | static int get_crypt_ftr_info(char **metadata_fname, off64_t *off) |
| 357 | { |
| 358 | static int cached_data = 0; |
| 359 | static off64_t cached_off = 0; |
| 360 | static char cached_metadata_fname[PROPERTY_VALUE_MAX] = ""; |
| 361 | int fd; |
| 362 | char key_loc[PROPERTY_VALUE_MAX]; |
| 363 | char real_blkdev[PROPERTY_VALUE_MAX]; |
| 364 | unsigned int nr_sec; |
| 365 | int rc = -1; |
| 366 | |
| 367 | if (!cached_data) { |
| 368 | fs_mgr_get_crypt_info(fstab, key_loc, real_blkdev, sizeof(key_loc)); |
| 369 | |
| 370 | if (!strcmp(key_loc, KEY_IN_FOOTER)) { |
| 371 | if ( (fd = open(real_blkdev, O_RDWR)) < 0) { |
| 372 | SLOGE("Cannot open real block device %s\n", real_blkdev); |
| 373 | return -1; |
| 374 | } |
| 375 | |
| 376 | if ((nr_sec = get_blkdev_size(fd))) { |
| 377 | /* If it's an encrypted Android partition, the last 16 Kbytes contain the |
| 378 | * encryption info footer and key, and plenty of bytes to spare for future |
| 379 | * growth. |
| 380 | */ |
| 381 | strlcpy(cached_metadata_fname, real_blkdev, sizeof(cached_metadata_fname)); |
| 382 | cached_off = ((off64_t)nr_sec * 512) - CRYPT_FOOTER_OFFSET; |
| 383 | cached_data = 1; |
| 384 | } else { |
| 385 | SLOGE("Cannot get size of block device %s\n", real_blkdev); |
| 386 | } |
| 387 | close(fd); |
| 388 | } else { |
| 389 | strlcpy(cached_metadata_fname, key_loc, sizeof(cached_metadata_fname)); |
| 390 | cached_off = 0; |
| 391 | cached_data = 1; |
| 392 | } |
| 393 | } |
| 394 | |
| 395 | if (cached_data) { |
| 396 | if (metadata_fname) { |
| 397 | *metadata_fname = cached_metadata_fname; |
| 398 | } |
| 399 | if (off) { |
| 400 | *off = cached_off; |
| 401 | } |
| 402 | rc = 0; |
| 403 | } |
| 404 | |
| 405 | return rc; |
| 406 | } |
| 407 | |
Ken Sumrall | e874407 | 2011-01-18 22:01:55 -0800 | [diff] [blame] | 408 | /* key or salt can be NULL, in which case just skip writing that value. Useful to |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 409 | * update the failed mount count but not change the key. |
| 410 | */ |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 411 | static int put_crypt_ftr_and_key(struct crypt_mnt_ftr *crypt_ftr) |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 412 | { |
| 413 | int fd; |
| 414 | unsigned int nr_sec, cnt; |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 415 | /* starting_off is set to the SEEK_SET offset |
| 416 | * where the crypto structure starts |
| 417 | */ |
| 418 | off64_t starting_off; |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 419 | int rc = -1; |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 420 | char *fname = NULL; |
Ken Sumrall | 3be890f | 2011-09-14 16:53:46 -0700 | [diff] [blame] | 421 | struct stat statbuf; |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 422 | |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 423 | if (get_crypt_ftr_info(&fname, &starting_off)) { |
| 424 | SLOGE("Unable to get crypt_ftr_info\n"); |
| 425 | return -1; |
| 426 | } |
| 427 | if (fname[0] != '/') { |
Ken Sumrall | e5032c4 | 2012-04-01 23:58:44 -0700 | [diff] [blame] | 428 | SLOGE("Unexpected value for crypto key location\n"); |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 429 | return -1; |
| 430 | } |
Ken Sumrall | e550f78 | 2013-08-20 13:48:23 -0700 | [diff] [blame] | 431 | if ( (fd = open(fname, O_RDWR | O_CREAT, 0600)) < 0) { |
| 432 | SLOGE("Cannot open footer file %s for put\n", fname); |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 433 | return -1; |
| 434 | } |
| 435 | |
| 436 | /* Seek to the start of the crypt footer */ |
| 437 | if (lseek64(fd, starting_off, SEEK_SET) == -1) { |
| 438 | SLOGE("Cannot seek to real block device footer\n"); |
| 439 | goto errout; |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 440 | } |
| 441 | |
| 442 | if ((cnt = write(fd, crypt_ftr, sizeof(struct crypt_mnt_ftr))) != sizeof(struct crypt_mnt_ftr)) { |
| 443 | SLOGE("Cannot write real block device footer\n"); |
| 444 | goto errout; |
| 445 | } |
| 446 | |
Ken Sumrall | 3be890f | 2011-09-14 16:53:46 -0700 | [diff] [blame] | 447 | fstat(fd, &statbuf); |
| 448 | /* If the keys are kept on a raw block device, do not try to truncate it. */ |
Ken Sumrall | e550f78 | 2013-08-20 13:48:23 -0700 | [diff] [blame] | 449 | if (S_ISREG(statbuf.st_mode)) { |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 450 | if (ftruncate(fd, 0x4000)) { |
Colin Cross | 59846b6 | 2014-02-06 20:34:29 -0800 | [diff] [blame] | 451 | SLOGE("Cannot set footer file size\n"); |
Ken Sumrall | e874407 | 2011-01-18 22:01:55 -0800 | [diff] [blame] | 452 | goto errout; |
| 453 | } |
| 454 | } |
| 455 | |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 456 | /* Success! */ |
| 457 | rc = 0; |
| 458 | |
| 459 | errout: |
| 460 | close(fd); |
| 461 | return rc; |
| 462 | |
| 463 | } |
| 464 | |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 465 | static inline int unix_read(int fd, void* buff, int len) |
| 466 | { |
| 467 | return TEMP_FAILURE_RETRY(read(fd, buff, len)); |
| 468 | } |
| 469 | |
| 470 | static inline int unix_write(int fd, const void* buff, int len) |
| 471 | { |
| 472 | return TEMP_FAILURE_RETRY(write(fd, buff, len)); |
| 473 | } |
| 474 | |
| 475 | static void init_empty_persist_data(struct crypt_persist_data *pdata, int len) |
| 476 | { |
| 477 | memset(pdata, 0, len); |
| 478 | pdata->persist_magic = PERSIST_DATA_MAGIC; |
| 479 | pdata->persist_valid_entries = 0; |
| 480 | } |
| 481 | |
| 482 | /* A routine to update the passed in crypt_ftr to the lastest version. |
| 483 | * fd is open read/write on the device that holds the crypto footer and persistent |
| 484 | * data, crypt_ftr is a pointer to the struct to be updated, and offset is the |
| 485 | * absolute offset to the start of the crypt_mnt_ftr on the passed in fd. |
| 486 | */ |
| 487 | static void upgrade_crypt_ftr(int fd, struct crypt_mnt_ftr *crypt_ftr, off64_t offset) |
| 488 | { |
Kenny Root | 7434b31 | 2013-06-14 11:29:53 -0700 | [diff] [blame] | 489 | int orig_major = crypt_ftr->major_version; |
| 490 | int orig_minor = crypt_ftr->minor_version; |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 491 | |
Kenny Root | 7434b31 | 2013-06-14 11:29:53 -0700 | [diff] [blame] | 492 | if ((crypt_ftr->major_version == 1) && (crypt_ftr->minor_version == 0)) { |
| 493 | struct crypt_persist_data *pdata; |
| 494 | off64_t pdata_offset = offset + CRYPT_FOOTER_TO_PERSIST_OFFSET; |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 495 | |
Kenny Root | c4c70f1 | 2013-06-14 12:11:38 -0700 | [diff] [blame] | 496 | SLOGW("upgrading crypto footer to 1.1"); |
| 497 | |
Kenny Root | 7434b31 | 2013-06-14 11:29:53 -0700 | [diff] [blame] | 498 | pdata = malloc(CRYPT_PERSIST_DATA_SIZE); |
| 499 | if (pdata == NULL) { |
| 500 | SLOGE("Cannot allocate persisent data\n"); |
| 501 | return; |
| 502 | } |
| 503 | memset(pdata, 0, CRYPT_PERSIST_DATA_SIZE); |
| 504 | |
| 505 | /* Need to initialize the persistent data area */ |
| 506 | if (lseek64(fd, pdata_offset, SEEK_SET) == -1) { |
| 507 | SLOGE("Cannot seek to persisent data offset\n"); |
| 508 | return; |
| 509 | } |
| 510 | /* Write all zeros to the first copy, making it invalid */ |
| 511 | unix_write(fd, pdata, CRYPT_PERSIST_DATA_SIZE); |
| 512 | |
| 513 | /* Write a valid but empty structure to the second copy */ |
| 514 | init_empty_persist_data(pdata, CRYPT_PERSIST_DATA_SIZE); |
| 515 | unix_write(fd, pdata, CRYPT_PERSIST_DATA_SIZE); |
| 516 | |
| 517 | /* Update the footer */ |
| 518 | crypt_ftr->persist_data_size = CRYPT_PERSIST_DATA_SIZE; |
| 519 | crypt_ftr->persist_data_offset[0] = pdata_offset; |
| 520 | crypt_ftr->persist_data_offset[1] = pdata_offset + CRYPT_PERSIST_DATA_SIZE; |
| 521 | crypt_ftr->minor_version = 1; |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 522 | } |
| 523 | |
Paul Lawrence | f4faa57 | 2014-01-29 13:31:03 -0800 | [diff] [blame] | 524 | if ((crypt_ftr->major_version == 1) && (crypt_ftr->minor_version == 1)) { |
Kenny Root | c4c70f1 | 2013-06-14 12:11:38 -0700 | [diff] [blame] | 525 | SLOGW("upgrading crypto footer to 1.2"); |
JP Abgrall | 7bdfa52 | 2013-11-15 13:42:56 -0800 | [diff] [blame] | 526 | /* But keep the old kdf_type. |
| 527 | * It will get updated later to KDF_SCRYPT after the password has been verified. |
| 528 | */ |
Kenny Root | c4c70f1 | 2013-06-14 12:11:38 -0700 | [diff] [blame] | 529 | crypt_ftr->kdf_type = KDF_PBKDF2; |
| 530 | get_device_scrypt_params(crypt_ftr); |
| 531 | crypt_ftr->minor_version = 2; |
| 532 | } |
| 533 | |
Paul Lawrence | f4faa57 | 2014-01-29 13:31:03 -0800 | [diff] [blame] | 534 | if ((crypt_ftr->major_version == 1) && (crypt_ftr->minor_version == 2)) { |
| 535 | SLOGW("upgrading crypto footer to 1.3"); |
| 536 | crypt_ftr->crypt_type = CRYPT_TYPE_PASSWORD; |
| 537 | crypt_ftr->minor_version = 3; |
| 538 | } |
| 539 | |
Kenny Root | 7434b31 | 2013-06-14 11:29:53 -0700 | [diff] [blame] | 540 | if ((orig_major != crypt_ftr->major_version) || (orig_minor != crypt_ftr->minor_version)) { |
| 541 | if (lseek64(fd, offset, SEEK_SET) == -1) { |
| 542 | SLOGE("Cannot seek to crypt footer\n"); |
| 543 | return; |
| 544 | } |
| 545 | unix_write(fd, crypt_ftr, sizeof(struct crypt_mnt_ftr)); |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 546 | } |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 547 | } |
| 548 | |
| 549 | |
| 550 | static int get_crypt_ftr_and_key(struct crypt_mnt_ftr *crypt_ftr) |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 551 | { |
| 552 | int fd; |
| 553 | unsigned int nr_sec, cnt; |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 554 | off64_t starting_off; |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 555 | int rc = -1; |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 556 | char *fname = NULL; |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 557 | struct stat statbuf; |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 558 | |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 559 | if (get_crypt_ftr_info(&fname, &starting_off)) { |
| 560 | SLOGE("Unable to get crypt_ftr_info\n"); |
| 561 | return -1; |
| 562 | } |
| 563 | if (fname[0] != '/') { |
Ken Sumrall | e5032c4 | 2012-04-01 23:58:44 -0700 | [diff] [blame] | 564 | SLOGE("Unexpected value for crypto key location\n"); |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 565 | return -1; |
| 566 | } |
| 567 | if ( (fd = open(fname, O_RDWR)) < 0) { |
Ken Sumrall | e550f78 | 2013-08-20 13:48:23 -0700 | [diff] [blame] | 568 | SLOGE("Cannot open footer file %s for get\n", fname); |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 569 | return -1; |
| 570 | } |
| 571 | |
| 572 | /* Make sure it's 16 Kbytes in length */ |
| 573 | fstat(fd, &statbuf); |
| 574 | if (S_ISREG(statbuf.st_mode) && (statbuf.st_size != 0x4000)) { |
| 575 | SLOGE("footer file %s is not the expected size!\n", fname); |
| 576 | goto errout; |
| 577 | } |
| 578 | |
| 579 | /* Seek to the start of the crypt footer */ |
| 580 | if (lseek64(fd, starting_off, SEEK_SET) == -1) { |
| 581 | SLOGE("Cannot seek to real block device footer\n"); |
| 582 | goto errout; |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 583 | } |
| 584 | |
| 585 | if ( (cnt = read(fd, crypt_ftr, sizeof(struct crypt_mnt_ftr))) != sizeof(struct crypt_mnt_ftr)) { |
| 586 | SLOGE("Cannot read real block device footer\n"); |
| 587 | goto errout; |
| 588 | } |
| 589 | |
| 590 | if (crypt_ftr->magic != CRYPT_MNT_MAGIC) { |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 591 | SLOGE("Bad magic for real block device %s\n", fname); |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 592 | goto errout; |
| 593 | } |
| 594 | |
Kenny Root | c96a5f8 | 2013-06-14 12:08:28 -0700 | [diff] [blame] | 595 | if (crypt_ftr->major_version != CURRENT_MAJOR_VERSION) { |
| 596 | SLOGE("Cannot understand major version %d real block device footer; expected %d\n", |
| 597 | crypt_ftr->major_version, CURRENT_MAJOR_VERSION); |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 598 | goto errout; |
| 599 | } |
| 600 | |
Kenny Root | c96a5f8 | 2013-06-14 12:08:28 -0700 | [diff] [blame] | 601 | if (crypt_ftr->minor_version > CURRENT_MINOR_VERSION) { |
| 602 | SLOGW("Warning: crypto footer minor version %d, expected <= %d, continuing...\n", |
| 603 | crypt_ftr->minor_version, CURRENT_MINOR_VERSION); |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 604 | } |
| 605 | |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 606 | /* If this is a verion 1.0 crypt_ftr, make it a 1.1 crypt footer, and update the |
| 607 | * copy on disk before returning. |
| 608 | */ |
Kenny Root | c96a5f8 | 2013-06-14 12:08:28 -0700 | [diff] [blame] | 609 | if (crypt_ftr->minor_version < CURRENT_MINOR_VERSION) { |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 610 | upgrade_crypt_ftr(fd, crypt_ftr, starting_off); |
Ken Sumrall | e874407 | 2011-01-18 22:01:55 -0800 | [diff] [blame] | 611 | } |
| 612 | |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 613 | /* Success! */ |
| 614 | rc = 0; |
| 615 | |
| 616 | errout: |
| 617 | close(fd); |
| 618 | return rc; |
| 619 | } |
| 620 | |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 621 | static int validate_persistent_data_storage(struct crypt_mnt_ftr *crypt_ftr) |
| 622 | { |
| 623 | if (crypt_ftr->persist_data_offset[0] + crypt_ftr->persist_data_size > |
| 624 | crypt_ftr->persist_data_offset[1]) { |
| 625 | SLOGE("Crypt_ftr persist data regions overlap"); |
| 626 | return -1; |
| 627 | } |
| 628 | |
| 629 | if (crypt_ftr->persist_data_offset[0] >= crypt_ftr->persist_data_offset[1]) { |
| 630 | SLOGE("Crypt_ftr persist data region 0 starts after region 1"); |
| 631 | return -1; |
| 632 | } |
| 633 | |
| 634 | if (((crypt_ftr->persist_data_offset[1] + crypt_ftr->persist_data_size) - |
| 635 | (crypt_ftr->persist_data_offset[0] - CRYPT_FOOTER_TO_PERSIST_OFFSET)) > |
| 636 | CRYPT_FOOTER_OFFSET) { |
| 637 | SLOGE("Persistent data extends past crypto footer"); |
| 638 | return -1; |
| 639 | } |
| 640 | |
| 641 | return 0; |
| 642 | } |
| 643 | |
| 644 | static int load_persistent_data(void) |
| 645 | { |
| 646 | struct crypt_mnt_ftr crypt_ftr; |
| 647 | struct crypt_persist_data *pdata = NULL; |
| 648 | char encrypted_state[PROPERTY_VALUE_MAX]; |
| 649 | char *fname; |
| 650 | int found = 0; |
| 651 | int fd; |
| 652 | int ret; |
| 653 | int i; |
| 654 | |
| 655 | if (persist_data) { |
| 656 | /* Nothing to do, we've already loaded or initialized it */ |
| 657 | return 0; |
| 658 | } |
| 659 | |
| 660 | |
| 661 | /* If not encrypted, just allocate an empty table and initialize it */ |
| 662 | property_get("ro.crypto.state", encrypted_state, ""); |
| 663 | if (strcmp(encrypted_state, "encrypted") ) { |
| 664 | pdata = malloc(CRYPT_PERSIST_DATA_SIZE); |
| 665 | if (pdata) { |
| 666 | init_empty_persist_data(pdata, CRYPT_PERSIST_DATA_SIZE); |
| 667 | persist_data = pdata; |
| 668 | return 0; |
| 669 | } |
| 670 | return -1; |
| 671 | } |
| 672 | |
| 673 | if(get_crypt_ftr_and_key(&crypt_ftr)) { |
| 674 | return -1; |
| 675 | } |
| 676 | |
Paul Lawrence | 8561b5c | 2014-03-17 14:10:51 -0700 | [diff] [blame] | 677 | if ((crypt_ftr.major_version < 1) |
| 678 | || (crypt_ftr.major_version == 1 && crypt_ftr.minor_version < 1)) { |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 679 | SLOGE("Crypt_ftr version doesn't support persistent data"); |
| 680 | return -1; |
| 681 | } |
| 682 | |
| 683 | if (get_crypt_ftr_info(&fname, NULL)) { |
| 684 | return -1; |
| 685 | } |
| 686 | |
| 687 | ret = validate_persistent_data_storage(&crypt_ftr); |
| 688 | if (ret) { |
| 689 | return -1; |
| 690 | } |
| 691 | |
| 692 | fd = open(fname, O_RDONLY); |
| 693 | if (fd < 0) { |
| 694 | SLOGE("Cannot open %s metadata file", fname); |
| 695 | return -1; |
| 696 | } |
| 697 | |
| 698 | if (persist_data == NULL) { |
| 699 | pdata = malloc(crypt_ftr.persist_data_size); |
| 700 | if (pdata == NULL) { |
| 701 | SLOGE("Cannot allocate memory for persistent data"); |
| 702 | goto err; |
| 703 | } |
| 704 | } |
| 705 | |
| 706 | for (i = 0; i < 2; i++) { |
| 707 | if (lseek64(fd, crypt_ftr.persist_data_offset[i], SEEK_SET) < 0) { |
| 708 | SLOGE("Cannot seek to read persistent data on %s", fname); |
| 709 | goto err2; |
| 710 | } |
| 711 | if (unix_read(fd, pdata, crypt_ftr.persist_data_size) < 0){ |
| 712 | SLOGE("Error reading persistent data on iteration %d", i); |
| 713 | goto err2; |
| 714 | } |
| 715 | if (pdata->persist_magic == PERSIST_DATA_MAGIC) { |
| 716 | found = 1; |
| 717 | break; |
| 718 | } |
| 719 | } |
| 720 | |
| 721 | if (!found) { |
| 722 | SLOGI("Could not find valid persistent data, creating"); |
| 723 | init_empty_persist_data(pdata, crypt_ftr.persist_data_size); |
| 724 | } |
| 725 | |
| 726 | /* Success */ |
| 727 | persist_data = pdata; |
| 728 | close(fd); |
| 729 | return 0; |
| 730 | |
| 731 | err2: |
| 732 | free(pdata); |
| 733 | |
| 734 | err: |
| 735 | close(fd); |
| 736 | return -1; |
| 737 | } |
| 738 | |
| 739 | static int save_persistent_data(void) |
| 740 | { |
| 741 | struct crypt_mnt_ftr crypt_ftr; |
| 742 | struct crypt_persist_data *pdata; |
| 743 | char *fname; |
| 744 | off64_t write_offset; |
| 745 | off64_t erase_offset; |
| 746 | int found = 0; |
| 747 | int fd; |
| 748 | int ret; |
| 749 | |
| 750 | if (persist_data == NULL) { |
| 751 | SLOGE("No persistent data to save"); |
| 752 | return -1; |
| 753 | } |
| 754 | |
| 755 | if(get_crypt_ftr_and_key(&crypt_ftr)) { |
| 756 | return -1; |
| 757 | } |
| 758 | |
Paul Lawrence | 8561b5c | 2014-03-17 14:10:51 -0700 | [diff] [blame] | 759 | if ((crypt_ftr.major_version < 1) |
| 760 | || (crypt_ftr.major_version == 1 && crypt_ftr.minor_version < 1)) { |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 761 | SLOGE("Crypt_ftr version doesn't support persistent data"); |
| 762 | return -1; |
| 763 | } |
| 764 | |
| 765 | ret = validate_persistent_data_storage(&crypt_ftr); |
| 766 | if (ret) { |
| 767 | return -1; |
| 768 | } |
| 769 | |
| 770 | if (get_crypt_ftr_info(&fname, NULL)) { |
| 771 | return -1; |
| 772 | } |
| 773 | |
| 774 | fd = open(fname, O_RDWR); |
| 775 | if (fd < 0) { |
| 776 | SLOGE("Cannot open %s metadata file", fname); |
| 777 | return -1; |
| 778 | } |
| 779 | |
| 780 | pdata = malloc(crypt_ftr.persist_data_size); |
| 781 | if (pdata == NULL) { |
| 782 | SLOGE("Cannot allocate persistant data"); |
| 783 | goto err; |
| 784 | } |
| 785 | |
| 786 | if (lseek64(fd, crypt_ftr.persist_data_offset[0], SEEK_SET) < 0) { |
| 787 | SLOGE("Cannot seek to read persistent data on %s", fname); |
| 788 | goto err2; |
| 789 | } |
| 790 | |
| 791 | if (unix_read(fd, pdata, crypt_ftr.persist_data_size) < 0) { |
| 792 | SLOGE("Error reading persistent data before save"); |
| 793 | goto err2; |
| 794 | } |
| 795 | |
| 796 | if (pdata->persist_magic == PERSIST_DATA_MAGIC) { |
| 797 | /* The first copy is the curent valid copy, so write to |
| 798 | * the second copy and erase this one */ |
| 799 | write_offset = crypt_ftr.persist_data_offset[1]; |
| 800 | erase_offset = crypt_ftr.persist_data_offset[0]; |
| 801 | } else { |
| 802 | /* The second copy must be the valid copy, so write to |
| 803 | * the first copy, and erase the second */ |
| 804 | write_offset = crypt_ftr.persist_data_offset[0]; |
| 805 | erase_offset = crypt_ftr.persist_data_offset[1]; |
| 806 | } |
| 807 | |
| 808 | /* Write the new copy first, if successful, then erase the old copy */ |
| 809 | if (lseek(fd, write_offset, SEEK_SET) < 0) { |
| 810 | SLOGE("Cannot seek to write persistent data"); |
| 811 | goto err2; |
| 812 | } |
| 813 | if (unix_write(fd, persist_data, crypt_ftr.persist_data_size) == |
| 814 | (int) crypt_ftr.persist_data_size) { |
| 815 | if (lseek(fd, erase_offset, SEEK_SET) < 0) { |
| 816 | SLOGE("Cannot seek to erase previous persistent data"); |
| 817 | goto err2; |
| 818 | } |
| 819 | fsync(fd); |
| 820 | memset(pdata, 0, crypt_ftr.persist_data_size); |
| 821 | if (unix_write(fd, pdata, crypt_ftr.persist_data_size) != |
| 822 | (int) crypt_ftr.persist_data_size) { |
| 823 | SLOGE("Cannot write to erase previous persistent data"); |
| 824 | goto err2; |
| 825 | } |
| 826 | fsync(fd); |
| 827 | } else { |
| 828 | SLOGE("Cannot write to save persistent data"); |
| 829 | goto err2; |
| 830 | } |
| 831 | |
| 832 | /* Success */ |
| 833 | free(pdata); |
| 834 | close(fd); |
| 835 | return 0; |
| 836 | |
| 837 | err2: |
| 838 | free(pdata); |
| 839 | err: |
| 840 | close(fd); |
| 841 | return -1; |
| 842 | } |
| 843 | |
Paul Lawrence | f4faa57 | 2014-01-29 13:31:03 -0800 | [diff] [blame] | 844 | static int hexdigit (char c) |
| 845 | { |
| 846 | if (c >= '0' && c <= '9') return c - '0'; |
| 847 | c = tolower(c); |
| 848 | if (c >= 'a' && c <= 'f') return c - 'a' + 10; |
| 849 | return -1; |
| 850 | } |
| 851 | |
| 852 | static unsigned char* convert_hex_ascii_to_key(const char* master_key_ascii, |
| 853 | unsigned int* out_keysize) |
| 854 | { |
| 855 | unsigned int i; |
| 856 | *out_keysize = 0; |
| 857 | |
| 858 | size_t size = strlen (master_key_ascii); |
| 859 | if (size % 2) { |
| 860 | SLOGE("Trying to convert ascii string of odd length"); |
| 861 | return NULL; |
| 862 | } |
| 863 | |
| 864 | unsigned char* master_key = (unsigned char*) malloc(size / 2); |
| 865 | if (master_key == 0) { |
| 866 | SLOGE("Cannot allocate"); |
| 867 | return NULL; |
| 868 | } |
| 869 | |
| 870 | for (i = 0; i < size; i += 2) { |
| 871 | int high_nibble = hexdigit (master_key_ascii[i]); |
| 872 | int low_nibble = hexdigit (master_key_ascii[i + 1]); |
| 873 | |
| 874 | if(high_nibble < 0 || low_nibble < 0) { |
| 875 | SLOGE("Invalid hex string"); |
| 876 | free (master_key); |
| 877 | return NULL; |
| 878 | } |
| 879 | |
| 880 | master_key[*out_keysize] = high_nibble * 16 + low_nibble; |
| 881 | (*out_keysize)++; |
| 882 | } |
| 883 | |
| 884 | return master_key; |
| 885 | } |
| 886 | |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 887 | /* Convert a binary key of specified length into an ascii hex string equivalent, |
| 888 | * without the leading 0x and with null termination |
| 889 | */ |
Paul Lawrence | f4faa57 | 2014-01-29 13:31:03 -0800 | [diff] [blame] | 890 | static void convert_key_to_hex_ascii(unsigned char *master_key, unsigned int keysize, |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 891 | char *master_key_ascii) |
| 892 | { |
| 893 | unsigned int i, a; |
| 894 | unsigned char nibble; |
| 895 | |
| 896 | for (i=0, a=0; i<keysize; i++, a+=2) { |
| 897 | /* For each byte, write out two ascii hex digits */ |
| 898 | nibble = (master_key[i] >> 4) & 0xf; |
| 899 | master_key_ascii[a] = nibble + (nibble > 9 ? 0x37 : 0x30); |
| 900 | |
| 901 | nibble = master_key[i] & 0xf; |
| 902 | master_key_ascii[a+1] = nibble + (nibble > 9 ? 0x37 : 0x30); |
| 903 | } |
| 904 | |
| 905 | /* Add the null termination */ |
| 906 | master_key_ascii[a] = '\0'; |
| 907 | |
| 908 | } |
| 909 | |
Ken Sumrall | db5e026 | 2013-02-05 17:39:48 -0800 | [diff] [blame] | 910 | static int load_crypto_mapping_table(struct crypt_mnt_ftr *crypt_ftr, unsigned char *master_key, |
| 911 | char *real_blk_name, const char *name, int fd, |
| 912 | char *extra_params) |
| 913 | { |
| 914 | char buffer[DM_CRYPT_BUF_SIZE]; |
| 915 | struct dm_ioctl *io; |
| 916 | struct dm_target_spec *tgt; |
| 917 | char *crypt_params; |
| 918 | char master_key_ascii[129]; /* Large enough to hold 512 bit key and null */ |
| 919 | int i; |
| 920 | |
| 921 | io = (struct dm_ioctl *) buffer; |
| 922 | |
| 923 | /* Load the mapping table for this device */ |
| 924 | tgt = (struct dm_target_spec *) &buffer[sizeof(struct dm_ioctl)]; |
| 925 | |
| 926 | ioctl_init(io, DM_CRYPT_BUF_SIZE, name, 0); |
| 927 | io->target_count = 1; |
| 928 | tgt->status = 0; |
| 929 | tgt->sector_start = 0; |
| 930 | tgt->length = crypt_ftr->fs_size; |
| 931 | strcpy(tgt->target_type, "crypt"); |
| 932 | |
| 933 | crypt_params = buffer + sizeof(struct dm_ioctl) + sizeof(struct dm_target_spec); |
| 934 | convert_key_to_hex_ascii(master_key, crypt_ftr->keysize, master_key_ascii); |
| 935 | sprintf(crypt_params, "%s %s 0 %s 0 %s", crypt_ftr->crypto_type_name, |
| 936 | master_key_ascii, real_blk_name, extra_params); |
| 937 | crypt_params += strlen(crypt_params) + 1; |
| 938 | crypt_params = (char *) (((unsigned long)crypt_params + 7) & ~8); /* Align to an 8 byte boundary */ |
| 939 | tgt->next = crypt_params - buffer; |
| 940 | |
| 941 | for (i = 0; i < TABLE_LOAD_RETRIES; i++) { |
| 942 | if (! ioctl(fd, DM_TABLE_LOAD, io)) { |
| 943 | break; |
| 944 | } |
| 945 | usleep(500000); |
| 946 | } |
| 947 | |
| 948 | if (i == TABLE_LOAD_RETRIES) { |
| 949 | /* We failed to load the table, return an error */ |
| 950 | return -1; |
| 951 | } else { |
| 952 | return i + 1; |
| 953 | } |
| 954 | } |
| 955 | |
| 956 | |
| 957 | static int get_dm_crypt_version(int fd, const char *name, int *version) |
| 958 | { |
| 959 | char buffer[DM_CRYPT_BUF_SIZE]; |
| 960 | struct dm_ioctl *io; |
| 961 | struct dm_target_versions *v; |
| 962 | int i; |
| 963 | |
| 964 | io = (struct dm_ioctl *) buffer; |
| 965 | |
| 966 | ioctl_init(io, DM_CRYPT_BUF_SIZE, name, 0); |
| 967 | |
| 968 | if (ioctl(fd, DM_LIST_VERSIONS, io)) { |
| 969 | return -1; |
| 970 | } |
| 971 | |
| 972 | /* Iterate over the returned versions, looking for name of "crypt". |
| 973 | * When found, get and return the version. |
| 974 | */ |
| 975 | v = (struct dm_target_versions *) &buffer[sizeof(struct dm_ioctl)]; |
| 976 | while (v->next) { |
| 977 | if (! strcmp(v->name, "crypt")) { |
| 978 | /* We found the crypt driver, return the version, and get out */ |
| 979 | version[0] = v->version[0]; |
| 980 | version[1] = v->version[1]; |
| 981 | version[2] = v->version[2]; |
| 982 | return 0; |
| 983 | } |
| 984 | v = (struct dm_target_versions *)(((char *)v) + v->next); |
| 985 | } |
| 986 | |
| 987 | return -1; |
| 988 | } |
| 989 | |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 990 | static int create_crypto_blk_dev(struct crypt_mnt_ftr *crypt_ftr, unsigned char *master_key, |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 991 | char *real_blk_name, char *crypto_blk_name, const char *name) |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 992 | { |
| 993 | char buffer[DM_CRYPT_BUF_SIZE]; |
| 994 | char master_key_ascii[129]; /* Large enough to hold 512 bit key and null */ |
| 995 | char *crypt_params; |
| 996 | struct dm_ioctl *io; |
| 997 | struct dm_target_spec *tgt; |
| 998 | unsigned int minor; |
| 999 | int fd; |
Ken Sumrall | e919efe | 2012-09-29 17:07:41 -0700 | [diff] [blame] | 1000 | int i; |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1001 | int retval = -1; |
Ken Sumrall | db5e026 | 2013-02-05 17:39:48 -0800 | [diff] [blame] | 1002 | int version[3]; |
| 1003 | char *extra_params; |
| 1004 | int load_count; |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1005 | |
| 1006 | if ((fd = open("/dev/device-mapper", O_RDWR)) < 0 ) { |
| 1007 | SLOGE("Cannot open device-mapper\n"); |
| 1008 | goto errout; |
| 1009 | } |
| 1010 | |
| 1011 | io = (struct dm_ioctl *) buffer; |
| 1012 | |
| 1013 | ioctl_init(io, DM_CRYPT_BUF_SIZE, name, 0); |
| 1014 | if (ioctl(fd, DM_DEV_CREATE, io)) { |
| 1015 | SLOGE("Cannot create dm-crypt device\n"); |
| 1016 | goto errout; |
| 1017 | } |
| 1018 | |
| 1019 | /* Get the device status, in particular, the name of it's device file */ |
| 1020 | ioctl_init(io, DM_CRYPT_BUF_SIZE, name, 0); |
| 1021 | if (ioctl(fd, DM_DEV_STATUS, io)) { |
| 1022 | SLOGE("Cannot retrieve dm-crypt device status\n"); |
| 1023 | goto errout; |
| 1024 | } |
| 1025 | minor = (io->dev & 0xff) | ((io->dev >> 12) & 0xfff00); |
| 1026 | snprintf(crypto_blk_name, MAXPATHLEN, "/dev/block/dm-%u", minor); |
| 1027 | |
Ken Sumrall | db5e026 | 2013-02-05 17:39:48 -0800 | [diff] [blame] | 1028 | extra_params = ""; |
| 1029 | if (! get_dm_crypt_version(fd, name, version)) { |
| 1030 | /* Support for allow_discards was added in version 1.11.0 */ |
| 1031 | if ((version[0] >= 2) || |
| 1032 | ((version[0] == 1) && (version[1] >= 11))) { |
| 1033 | extra_params = "1 allow_discards"; |
| 1034 | SLOGI("Enabling support for allow_discards in dmcrypt.\n"); |
| 1035 | } |
Ken Sumrall | e919efe | 2012-09-29 17:07:41 -0700 | [diff] [blame] | 1036 | } |
| 1037 | |
Ken Sumrall | db5e026 | 2013-02-05 17:39:48 -0800 | [diff] [blame] | 1038 | load_count = load_crypto_mapping_table(crypt_ftr, master_key, real_blk_name, name, |
| 1039 | fd, extra_params); |
| 1040 | if (load_count < 0) { |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1041 | SLOGE("Cannot load dm-crypt mapping table.\n"); |
| 1042 | goto errout; |
Ken Sumrall | db5e026 | 2013-02-05 17:39:48 -0800 | [diff] [blame] | 1043 | } else if (load_count > 1) { |
| 1044 | SLOGI("Took %d tries to load dmcrypt table.\n", load_count); |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1045 | } |
| 1046 | |
| 1047 | /* Resume this device to activate it */ |
Ken Sumrall | db5e026 | 2013-02-05 17:39:48 -0800 | [diff] [blame] | 1048 | ioctl_init(io, DM_CRYPT_BUF_SIZE, name, 0); |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1049 | |
| 1050 | if (ioctl(fd, DM_DEV_SUSPEND, io)) { |
| 1051 | SLOGE("Cannot resume the dm-crypt device\n"); |
| 1052 | goto errout; |
| 1053 | } |
| 1054 | |
| 1055 | /* We made it here with no errors. Woot! */ |
| 1056 | retval = 0; |
| 1057 | |
| 1058 | errout: |
| 1059 | close(fd); /* If fd is <0 from a failed open call, it's safe to just ignore the close error */ |
| 1060 | |
| 1061 | return retval; |
| 1062 | } |
| 1063 | |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 1064 | static int delete_crypto_blk_dev(char *name) |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1065 | { |
| 1066 | int fd; |
| 1067 | char buffer[DM_CRYPT_BUF_SIZE]; |
| 1068 | struct dm_ioctl *io; |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1069 | int retval = -1; |
| 1070 | |
| 1071 | if ((fd = open("/dev/device-mapper", O_RDWR)) < 0 ) { |
| 1072 | SLOGE("Cannot open device-mapper\n"); |
| 1073 | goto errout; |
| 1074 | } |
| 1075 | |
| 1076 | io = (struct dm_ioctl *) buffer; |
| 1077 | |
| 1078 | ioctl_init(io, DM_CRYPT_BUF_SIZE, name, 0); |
| 1079 | if (ioctl(fd, DM_DEV_REMOVE, io)) { |
| 1080 | SLOGE("Cannot remove dm-crypt device\n"); |
| 1081 | goto errout; |
| 1082 | } |
| 1083 | |
| 1084 | /* We made it here with no errors. Woot! */ |
| 1085 | retval = 0; |
| 1086 | |
| 1087 | errout: |
| 1088 | close(fd); /* If fd is <0 from a failed open call, it's safe to just ignore the close error */ |
| 1089 | |
| 1090 | return retval; |
| 1091 | |
| 1092 | } |
| 1093 | |
Paul Lawrence | 69f4ebd | 2014-04-14 12:17:14 -0700 | [diff] [blame] | 1094 | static int pbkdf2(const char *passwd, const unsigned char *salt, |
Paul Lawrence | f4faa57 | 2014-01-29 13:31:03 -0800 | [diff] [blame] | 1095 | unsigned char *ikey, void *params UNUSED) |
| 1096 | { |
Paul Lawrence | 69f4ebd | 2014-04-14 12:17:14 -0700 | [diff] [blame] | 1097 | SLOGI("Using pbkdf2 for cryptfs KDF"); |
| 1098 | |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1099 | /* Turn the password into a key and IV that can decrypt the master key */ |
Paul Lawrence | f4faa57 | 2014-01-29 13:31:03 -0800 | [diff] [blame] | 1100 | unsigned int keysize; |
| 1101 | char* master_key = (char*)convert_hex_ascii_to_key(passwd, &keysize); |
| 1102 | if (!master_key) return -1; |
| 1103 | PKCS5_PBKDF2_HMAC_SHA1(master_key, keysize, salt, SALT_LEN, |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1104 | HASH_COUNT, KEY_LEN_BYTES+IV_LEN_BYTES, ikey); |
Paul Lawrence | f4faa57 | 2014-01-29 13:31:03 -0800 | [diff] [blame] | 1105 | |
Paul Lawrence | 69f4ebd | 2014-04-14 12:17:14 -0700 | [diff] [blame] | 1106 | memset(master_key, 0, keysize); |
Paul Lawrence | f4faa57 | 2014-01-29 13:31:03 -0800 | [diff] [blame] | 1107 | free (master_key); |
| 1108 | return 0; |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 1109 | } |
| 1110 | |
Paul Lawrence | 69f4ebd | 2014-04-14 12:17:14 -0700 | [diff] [blame] | 1111 | static int scrypt(const char *passwd, const unsigned char *salt, |
Paul Lawrence | f4faa57 | 2014-01-29 13:31:03 -0800 | [diff] [blame] | 1112 | unsigned char *ikey, void *params) |
| 1113 | { |
Paul Lawrence | 69f4ebd | 2014-04-14 12:17:14 -0700 | [diff] [blame] | 1114 | SLOGI("Using scrypt for cryptfs KDF"); |
| 1115 | |
Kenny Root | c4c70f1 | 2013-06-14 12:11:38 -0700 | [diff] [blame] | 1116 | struct crypt_mnt_ftr *ftr = (struct crypt_mnt_ftr *) params; |
| 1117 | |
| 1118 | int N = 1 << ftr->N_factor; |
| 1119 | int r = 1 << ftr->r_factor; |
| 1120 | int p = 1 << ftr->p_factor; |
| 1121 | |
| 1122 | /* Turn the password into a key and IV that can decrypt the master key */ |
Paul Lawrence | f4faa57 | 2014-01-29 13:31:03 -0800 | [diff] [blame] | 1123 | unsigned int keysize; |
| 1124 | unsigned char* master_key = convert_hex_ascii_to_key(passwd, &keysize); |
| 1125 | if (!master_key) return -1; |
| 1126 | crypto_scrypt(master_key, keysize, salt, SALT_LEN, N, r, p, ikey, |
Kenny Root | c4c70f1 | 2013-06-14 12:11:38 -0700 | [diff] [blame] | 1127 | KEY_LEN_BYTES + IV_LEN_BYTES); |
Paul Lawrence | f4faa57 | 2014-01-29 13:31:03 -0800 | [diff] [blame] | 1128 | |
Paul Lawrence | 69f4ebd | 2014-04-14 12:17:14 -0700 | [diff] [blame] | 1129 | memset(master_key, 0, keysize); |
Paul Lawrence | f4faa57 | 2014-01-29 13:31:03 -0800 | [diff] [blame] | 1130 | free (master_key); |
| 1131 | return 0; |
Kenny Root | c4c70f1 | 2013-06-14 12:11:38 -0700 | [diff] [blame] | 1132 | } |
| 1133 | |
Paul Lawrence | 69f4ebd | 2014-04-14 12:17:14 -0700 | [diff] [blame] | 1134 | static int scrypt_keymaster(const char *passwd, const unsigned char *salt, |
| 1135 | unsigned char *ikey, void *params) |
| 1136 | { |
| 1137 | SLOGI("Using scrypt with keymaster for cryptfs KDF"); |
| 1138 | |
| 1139 | int rc; |
| 1140 | unsigned int key_size; |
| 1141 | size_t signature_size; |
| 1142 | unsigned char* signature; |
| 1143 | struct crypt_mnt_ftr *ftr = (struct crypt_mnt_ftr *) params; |
| 1144 | |
| 1145 | int N = 1 << ftr->N_factor; |
| 1146 | int r = 1 << ftr->r_factor; |
| 1147 | int p = 1 << ftr->p_factor; |
| 1148 | |
| 1149 | unsigned char* master_key = convert_hex_ascii_to_key(passwd, &key_size); |
| 1150 | if (!master_key) { |
| 1151 | SLOGE("Failed to convert passwd from hex"); |
| 1152 | return -1; |
| 1153 | } |
| 1154 | |
| 1155 | rc = crypto_scrypt(master_key, key_size, salt, SALT_LEN, |
| 1156 | N, r, p, ikey, KEY_LEN_BYTES + IV_LEN_BYTES); |
| 1157 | memset(master_key, 0, key_size); |
| 1158 | free(master_key); |
| 1159 | |
| 1160 | if (rc) { |
| 1161 | SLOGE("scrypt failed"); |
| 1162 | return -1; |
| 1163 | } |
| 1164 | |
| 1165 | if (keymaster_sign_object(ftr, ikey, KEY_LEN_BYTES + IV_LEN_BYTES, |
| 1166 | &signature, &signature_size)) { |
| 1167 | SLOGE("Signing failed"); |
| 1168 | return -1; |
| 1169 | } |
| 1170 | |
| 1171 | rc = crypto_scrypt(signature, signature_size, salt, SALT_LEN, |
| 1172 | N, r, p, ikey, KEY_LEN_BYTES + IV_LEN_BYTES); |
| 1173 | free(signature); |
| 1174 | |
| 1175 | if (rc) { |
| 1176 | SLOGE("scrypt failed"); |
| 1177 | return -1; |
| 1178 | } |
| 1179 | |
| 1180 | return 0; |
| 1181 | } |
| 1182 | |
| 1183 | static int encrypt_master_key(const char *passwd, const unsigned char *salt, |
| 1184 | const unsigned char *decrypted_master_key, |
Kenny Root | c4c70f1 | 2013-06-14 12:11:38 -0700 | [diff] [blame] | 1185 | unsigned char *encrypted_master_key, |
| 1186 | struct crypt_mnt_ftr *crypt_ftr) |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 1187 | { |
| 1188 | unsigned char ikey[32+32] = { 0 }; /* Big enough to hold a 256 bit key and 256 bit IV */ |
| 1189 | EVP_CIPHER_CTX e_ctx; |
| 1190 | int encrypted_len, final_len; |
Paul Lawrence | d0c7b17 | 2014-08-08 14:28:10 -0700 | [diff] [blame^] | 1191 | int rc = 0; |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 1192 | |
Paul Lawrence | d0c7b17 | 2014-08-08 14:28:10 -0700 | [diff] [blame^] | 1193 | /* Turn the password into an intermediate key and IV that can decrypt the master key */ |
Kenny Root | c4c70f1 | 2013-06-14 12:11:38 -0700 | [diff] [blame] | 1194 | get_device_scrypt_params(crypt_ftr); |
Paul Lawrence | 69f4ebd | 2014-04-14 12:17:14 -0700 | [diff] [blame] | 1195 | |
| 1196 | switch (crypt_ftr->kdf_type) { |
| 1197 | case KDF_SCRYPT_KEYMASTER: |
| 1198 | if (keymaster_create_key(crypt_ftr)) { |
| 1199 | SLOGE("keymaster_create_key failed"); |
| 1200 | return -1; |
| 1201 | } |
| 1202 | |
| 1203 | if (scrypt_keymaster(passwd, salt, ikey, crypt_ftr)) { |
| 1204 | SLOGE("scrypt failed"); |
| 1205 | return -1; |
| 1206 | } |
| 1207 | break; |
| 1208 | |
| 1209 | case KDF_SCRYPT: |
| 1210 | if (scrypt(passwd, salt, ikey, crypt_ftr)) { |
| 1211 | SLOGE("scrypt failed"); |
| 1212 | return -1; |
| 1213 | } |
| 1214 | break; |
| 1215 | |
| 1216 | default: |
| 1217 | SLOGE("Invalid kdf_type"); |
Paul Lawrence | f4faa57 | 2014-01-29 13:31:03 -0800 | [diff] [blame] | 1218 | return -1; |
| 1219 | } |
Kenny Root | c4c70f1 | 2013-06-14 12:11:38 -0700 | [diff] [blame] | 1220 | |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1221 | /* Initialize the decryption engine */ |
| 1222 | if (! EVP_EncryptInit(&e_ctx, EVP_aes_128_cbc(), ikey, ikey+KEY_LEN_BYTES)) { |
| 1223 | SLOGE("EVP_EncryptInit failed\n"); |
| 1224 | return -1; |
| 1225 | } |
| 1226 | EVP_CIPHER_CTX_set_padding(&e_ctx, 0); /* Turn off padding as our data is block aligned */ |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 1227 | |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1228 | /* Encrypt the master key */ |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 1229 | if (! EVP_EncryptUpdate(&e_ctx, encrypted_master_key, &encrypted_len, |
| 1230 | decrypted_master_key, KEY_LEN_BYTES)) { |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1231 | SLOGE("EVP_EncryptUpdate failed\n"); |
| 1232 | return -1; |
| 1233 | } |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 1234 | if (! EVP_EncryptFinal(&e_ctx, encrypted_master_key + encrypted_len, &final_len)) { |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1235 | SLOGE("EVP_EncryptFinal failed\n"); |
| 1236 | return -1; |
| 1237 | } |
| 1238 | |
| 1239 | if (encrypted_len + final_len != KEY_LEN_BYTES) { |
| 1240 | SLOGE("EVP_Encryption length check failed with %d, %d bytes\n", encrypted_len, final_len); |
| 1241 | return -1; |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1242 | } |
Paul Lawrence | 69f4ebd | 2014-04-14 12:17:14 -0700 | [diff] [blame] | 1243 | |
Paul Lawrence | d0c7b17 | 2014-08-08 14:28:10 -0700 | [diff] [blame^] | 1244 | /* Store the scrypt of the intermediate key, so we can validate if it's a |
| 1245 | password error or mount error when things go wrong. |
| 1246 | Note there's no need to check for errors, since if this is incorrect, we |
| 1247 | simply won't wipe userdata, which is the correct default behavior |
| 1248 | */ |
| 1249 | int N = 1 << crypt_ftr->N_factor; |
| 1250 | int r = 1 << crypt_ftr->r_factor; |
| 1251 | int p = 1 << crypt_ftr->p_factor; |
| 1252 | |
| 1253 | rc = crypto_scrypt(ikey, KEY_LEN_BYTES, |
| 1254 | crypt_ftr->salt, sizeof(crypt_ftr->salt), N, r, p, |
| 1255 | crypt_ftr->scrypted_intermediate_key, |
| 1256 | sizeof(crypt_ftr->scrypted_intermediate_key)); |
| 1257 | |
| 1258 | if (rc) { |
| 1259 | SLOGE("encrypt_master_key: crypto_scrypt failed"); |
| 1260 | } |
| 1261 | |
Paul Lawrence | 69f4ebd | 2014-04-14 12:17:14 -0700 | [diff] [blame] | 1262 | return 0; |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1263 | } |
| 1264 | |
JP Abgrall | 7bdfa52 | 2013-11-15 13:42:56 -0800 | [diff] [blame] | 1265 | static int decrypt_master_key_aux(char *passwd, unsigned char *salt, |
Paul Lawrence | d0c7b17 | 2014-08-08 14:28:10 -0700 | [diff] [blame^] | 1266 | unsigned char *encrypted_master_key, |
| 1267 | unsigned char *decrypted_master_key, |
| 1268 | kdf_func kdf, void *kdf_params, |
| 1269 | unsigned char** intermediate_key, |
| 1270 | size_t* intermediate_key_size) |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1271 | { |
| 1272 | unsigned char ikey[32+32] = { 0 }; /* Big enough to hold a 256 bit key and 256 bit IV */ |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1273 | EVP_CIPHER_CTX d_ctx; |
| 1274 | int decrypted_len, final_len; |
| 1275 | |
Paul Lawrence | d0c7b17 | 2014-08-08 14:28:10 -0700 | [diff] [blame^] | 1276 | /* Turn the password into an intermediate key and IV that can decrypt the |
| 1277 | master key */ |
Paul Lawrence | f4faa57 | 2014-01-29 13:31:03 -0800 | [diff] [blame] | 1278 | if (kdf(passwd, salt, ikey, kdf_params)) { |
| 1279 | SLOGE("kdf failed"); |
| 1280 | return -1; |
| 1281 | } |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1282 | |
| 1283 | /* Initialize the decryption engine */ |
| 1284 | if (! EVP_DecryptInit(&d_ctx, EVP_aes_128_cbc(), ikey, ikey+KEY_LEN_BYTES)) { |
| 1285 | return -1; |
| 1286 | } |
| 1287 | EVP_CIPHER_CTX_set_padding(&d_ctx, 0); /* Turn off padding as our data is block aligned */ |
| 1288 | /* Decrypt the master key */ |
| 1289 | if (! EVP_DecryptUpdate(&d_ctx, decrypted_master_key, &decrypted_len, |
| 1290 | encrypted_master_key, KEY_LEN_BYTES)) { |
| 1291 | return -1; |
| 1292 | } |
| 1293 | if (! EVP_DecryptFinal(&d_ctx, decrypted_master_key + decrypted_len, &final_len)) { |
| 1294 | return -1; |
| 1295 | } |
| 1296 | |
| 1297 | if (decrypted_len + final_len != KEY_LEN_BYTES) { |
| 1298 | return -1; |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1299 | } |
Paul Lawrence | d0c7b17 | 2014-08-08 14:28:10 -0700 | [diff] [blame^] | 1300 | |
| 1301 | /* Copy intermediate key if needed by params */ |
| 1302 | if (intermediate_key && intermediate_key_size) { |
| 1303 | *intermediate_key = (unsigned char*) malloc(KEY_LEN_BYTES); |
| 1304 | if (intermediate_key) { |
| 1305 | memcpy(*intermediate_key, ikey, KEY_LEN_BYTES); |
| 1306 | *intermediate_key_size = KEY_LEN_BYTES; |
| 1307 | } |
| 1308 | } |
| 1309 | |
| 1310 | return 0; |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1311 | } |
| 1312 | |
Kenny Root | c4c70f1 | 2013-06-14 12:11:38 -0700 | [diff] [blame] | 1313 | static void get_kdf_func(struct crypt_mnt_ftr *ftr, kdf_func *kdf, void** kdf_params) |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 1314 | { |
Paul Lawrence | 69f4ebd | 2014-04-14 12:17:14 -0700 | [diff] [blame] | 1315 | if (ftr->kdf_type == KDF_SCRYPT_KEYMASTER) { |
| 1316 | *kdf = scrypt_keymaster; |
| 1317 | *kdf_params = ftr; |
| 1318 | } else if (ftr->kdf_type == KDF_SCRYPT) { |
Kenny Root | c4c70f1 | 2013-06-14 12:11:38 -0700 | [diff] [blame] | 1319 | *kdf = scrypt; |
| 1320 | *kdf_params = ftr; |
| 1321 | } else { |
| 1322 | *kdf = pbkdf2; |
| 1323 | *kdf_params = NULL; |
| 1324 | } |
| 1325 | } |
| 1326 | |
JP Abgrall | 7bdfa52 | 2013-11-15 13:42:56 -0800 | [diff] [blame] | 1327 | static int decrypt_master_key(char *passwd, unsigned char *decrypted_master_key, |
Paul Lawrence | d0c7b17 | 2014-08-08 14:28:10 -0700 | [diff] [blame^] | 1328 | struct crypt_mnt_ftr *crypt_ftr, |
| 1329 | unsigned char** intermediate_key, |
| 1330 | size_t* intermediate_key_size) |
Kenny Root | c4c70f1 | 2013-06-14 12:11:38 -0700 | [diff] [blame] | 1331 | { |
| 1332 | kdf_func kdf; |
| 1333 | void *kdf_params; |
| 1334 | int ret; |
| 1335 | |
| 1336 | get_kdf_func(crypt_ftr, &kdf, &kdf_params); |
Paul Lawrence | d0c7b17 | 2014-08-08 14:28:10 -0700 | [diff] [blame^] | 1337 | ret = decrypt_master_key_aux(passwd, crypt_ftr->salt, crypt_ftr->master_key, |
| 1338 | decrypted_master_key, kdf, kdf_params, |
| 1339 | intermediate_key, intermediate_key_size); |
Kenny Root | c4c70f1 | 2013-06-14 12:11:38 -0700 | [diff] [blame] | 1340 | if (ret != 0) { |
| 1341 | SLOGW("failure decrypting master key"); |
Kenny Root | c4c70f1 | 2013-06-14 12:11:38 -0700 | [diff] [blame] | 1342 | } |
| 1343 | |
| 1344 | return ret; |
| 1345 | } |
| 1346 | |
| 1347 | static int create_encrypted_random_key(char *passwd, unsigned char *master_key, unsigned char *salt, |
| 1348 | struct crypt_mnt_ftr *crypt_ftr) { |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 1349 | int fd; |
Ken Sumrall | e874407 | 2011-01-18 22:01:55 -0800 | [diff] [blame] | 1350 | unsigned char key_buf[KEY_LEN_BYTES]; |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 1351 | EVP_CIPHER_CTX e_ctx; |
| 1352 | int encrypted_len, final_len; |
| 1353 | |
| 1354 | /* Get some random bits for a key */ |
| 1355 | fd = open("/dev/urandom", O_RDONLY); |
Ken Sumrall | e874407 | 2011-01-18 22:01:55 -0800 | [diff] [blame] | 1356 | read(fd, key_buf, sizeof(key_buf)); |
| 1357 | read(fd, salt, SALT_LEN); |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 1358 | close(fd); |
| 1359 | |
| 1360 | /* Now encrypt it with the password */ |
Kenny Root | c4c70f1 | 2013-06-14 12:11:38 -0700 | [diff] [blame] | 1361 | return encrypt_master_key(passwd, salt, key_buf, master_key, crypt_ftr); |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 1362 | } |
| 1363 | |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1364 | static int wait_and_unmount(char *mountpoint) |
| 1365 | { |
| 1366 | int i, rc; |
Ken Sumrall | 2eaf713 | 2011-01-14 12:45:48 -0800 | [diff] [blame] | 1367 | #define WAIT_UNMOUNT_COUNT 20 |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1368 | |
| 1369 | /* Now umount the tmpfs filesystem */ |
| 1370 | for (i=0; i<WAIT_UNMOUNT_COUNT; i++) { |
| 1371 | if (umount(mountpoint)) { |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 1372 | if (errno == EINVAL) { |
| 1373 | /* EINVAL is returned if the directory is not a mountpoint, |
| 1374 | * i.e. there is no filesystem mounted there. So just get out. |
| 1375 | */ |
| 1376 | break; |
| 1377 | } |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1378 | sleep(1); |
| 1379 | i++; |
| 1380 | } else { |
| 1381 | break; |
| 1382 | } |
| 1383 | } |
| 1384 | |
| 1385 | if (i < WAIT_UNMOUNT_COUNT) { |
| 1386 | SLOGD("unmounting %s succeeded\n", mountpoint); |
| 1387 | rc = 0; |
| 1388 | } else { |
| 1389 | SLOGE("unmounting %s failed\n", mountpoint); |
| 1390 | rc = -1; |
| 1391 | } |
| 1392 | |
| 1393 | return rc; |
| 1394 | } |
| 1395 | |
Ken Sumrall | c587269 | 2013-05-14 15:26:31 -0700 | [diff] [blame] | 1396 | #define DATA_PREP_TIMEOUT 200 |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 1397 | static int prep_data_fs(void) |
| 1398 | { |
| 1399 | int i; |
| 1400 | |
| 1401 | /* Do the prep of the /data filesystem */ |
| 1402 | property_set("vold.post_fs_data_done", "0"); |
| 1403 | property_set("vold.decrypt", "trigger_post_fs_data"); |
| 1404 | SLOGD("Just triggered post_fs_data\n"); |
| 1405 | |
Ken Sumrall | c587269 | 2013-05-14 15:26:31 -0700 | [diff] [blame] | 1406 | /* Wait a max of 50 seconds, hopefully it takes much less */ |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 1407 | for (i=0; i<DATA_PREP_TIMEOUT; i++) { |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 1408 | char p[PROPERTY_VALUE_MAX]; |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 1409 | |
| 1410 | property_get("vold.post_fs_data_done", p, "0"); |
| 1411 | if (*p == '1') { |
| 1412 | break; |
| 1413 | } else { |
| 1414 | usleep(250000); |
| 1415 | } |
| 1416 | } |
| 1417 | if (i == DATA_PREP_TIMEOUT) { |
| 1418 | /* Ugh, we failed to prep /data in time. Bail. */ |
Ken Sumrall | c587269 | 2013-05-14 15:26:31 -0700 | [diff] [blame] | 1419 | SLOGE("post_fs_data timed out!\n"); |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 1420 | return -1; |
| 1421 | } else { |
| 1422 | SLOGD("post_fs_data done\n"); |
| 1423 | return 0; |
| 1424 | } |
| 1425 | } |
| 1426 | |
Paul Lawrence | f4faa57 | 2014-01-29 13:31:03 -0800 | [diff] [blame] | 1427 | static int cryptfs_restart_internal(int restart_main) |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1428 | { |
| 1429 | char fs_type[32]; |
| 1430 | char real_blkdev[MAXPATHLEN]; |
Ken Sumrall | 6864b7e | 2011-01-14 15:20:02 -0800 | [diff] [blame] | 1431 | char crypto_blkdev[MAXPATHLEN]; |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1432 | char fs_options[256]; |
| 1433 | unsigned long mnt_flags; |
| 1434 | struct stat statbuf; |
| 1435 | int rc = -1, i; |
Ken Sumrall | 0cc1663 | 2011-01-18 20:32:26 -0800 | [diff] [blame] | 1436 | static int restart_successful = 0; |
| 1437 | |
| 1438 | /* Validate that it's OK to call this routine */ |
Jason parks | 70a4b3f | 2011-01-28 10:10:47 -0600 | [diff] [blame] | 1439 | if (! master_key_saved) { |
Ken Sumrall | 0cc1663 | 2011-01-18 20:32:26 -0800 | [diff] [blame] | 1440 | SLOGE("Encrypted filesystem not validated, aborting"); |
| 1441 | return -1; |
| 1442 | } |
| 1443 | |
| 1444 | if (restart_successful) { |
| 1445 | SLOGE("System already restarted with encrypted disk, aborting"); |
| 1446 | return -1; |
| 1447 | } |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1448 | |
Paul Lawrence | f4faa57 | 2014-01-29 13:31:03 -0800 | [diff] [blame] | 1449 | if (restart_main) { |
| 1450 | /* Here is where we shut down the framework. The init scripts |
| 1451 | * start all services in one of three classes: core, main or late_start. |
| 1452 | * On boot, we start core and main. Now, we stop main, but not core, |
| 1453 | * as core includes vold and a few other really important things that |
| 1454 | * we need to keep running. Once main has stopped, we should be able |
| 1455 | * to umount the tmpfs /data, then mount the encrypted /data. |
| 1456 | * We then restart the class main, and also the class late_start. |
| 1457 | * At the moment, I've only put a few things in late_start that I know |
| 1458 | * are not needed to bring up the framework, and that also cause problems |
| 1459 | * with unmounting the tmpfs /data, but I hope to add add more services |
| 1460 | * to the late_start class as we optimize this to decrease the delay |
| 1461 | * till the user is asked for the password to the filesystem. |
| 1462 | */ |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1463 | |
Paul Lawrence | f4faa57 | 2014-01-29 13:31:03 -0800 | [diff] [blame] | 1464 | /* The init files are setup to stop the class main when vold.decrypt is |
| 1465 | * set to trigger_reset_main. |
| 1466 | */ |
| 1467 | property_set("vold.decrypt", "trigger_reset_main"); |
| 1468 | SLOGD("Just asked init to shut down class main\n"); |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1469 | |
Paul Lawrence | f4faa57 | 2014-01-29 13:31:03 -0800 | [diff] [blame] | 1470 | /* Ugh, shutting down the framework is not synchronous, so until it |
| 1471 | * can be fixed, this horrible hack will wait a moment for it all to |
| 1472 | * shut down before proceeding. Without it, some devices cannot |
| 1473 | * restart the graphics services. |
| 1474 | */ |
| 1475 | sleep(2); |
| 1476 | } |
Ken Sumrall | 9dedfd4 | 2012-10-09 14:16:59 -0700 | [diff] [blame] | 1477 | |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1478 | /* Now that the framework is shutdown, we should be able to umount() |
| 1479 | * the tmpfs filesystem, and mount the real one. |
| 1480 | */ |
| 1481 | |
Ken Sumrall | 6864b7e | 2011-01-14 15:20:02 -0800 | [diff] [blame] | 1482 | property_get("ro.crypto.fs_crypto_blkdev", crypto_blkdev, ""); |
| 1483 | if (strlen(crypto_blkdev) == 0) { |
| 1484 | SLOGE("fs_crypto_blkdev not set\n"); |
| 1485 | return -1; |
| 1486 | } |
| 1487 | |
Ken Sumrall | e5032c4 | 2012-04-01 23:58:44 -0700 | [diff] [blame] | 1488 | if (! (rc = wait_and_unmount(DATA_MNT_POINT)) ) { |
Doug Zongker | 6fd5771 | 2013-12-17 09:43:23 -0800 | [diff] [blame] | 1489 | /* If ro.crypto.readonly is set to 1, mount the decrypted |
| 1490 | * filesystem readonly. This is used when /data is mounted by |
| 1491 | * recovery mode. |
| 1492 | */ |
| 1493 | char ro_prop[PROPERTY_VALUE_MAX]; |
| 1494 | property_get("ro.crypto.readonly", ro_prop, ""); |
| 1495 | if (strlen(ro_prop) > 0 && atoi(ro_prop)) { |
| 1496 | struct fstab_rec* rec = fs_mgr_get_entry_for_mount_point(fstab, DATA_MNT_POINT); |
| 1497 | rec->flags |= MS_RDONLY; |
| 1498 | } |
JP Abgrall | 62c7af3 | 2014-06-16 13:01:23 -0700 | [diff] [blame] | 1499 | |
Ken Sumrall | e5032c4 | 2012-04-01 23:58:44 -0700 | [diff] [blame] | 1500 | /* If that succeeded, then mount the decrypted filesystem */ |
Ken Sumrall | 56ad03c | 2013-02-13 13:00:19 -0800 | [diff] [blame] | 1501 | fs_mgr_do_mount(fstab, DATA_MNT_POINT, crypto_blkdev, 0); |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1502 | |
Ken Sumrall | e5032c4 | 2012-04-01 23:58:44 -0700 | [diff] [blame] | 1503 | property_set("vold.decrypt", "trigger_load_persist_props"); |
| 1504 | /* Create necessary paths on /data */ |
| 1505 | if (prep_data_fs()) { |
| 1506 | return -1; |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1507 | } |
Ken Sumrall | e5032c4 | 2012-04-01 23:58:44 -0700 | [diff] [blame] | 1508 | |
| 1509 | /* startup service classes main and late_start */ |
| 1510 | property_set("vold.decrypt", "trigger_restart_framework"); |
| 1511 | SLOGD("Just triggered restart_framework\n"); |
| 1512 | |
| 1513 | /* Give it a few moments to get started */ |
| 1514 | sleep(1); |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1515 | } |
| 1516 | |
Ken Sumrall | 0cc1663 | 2011-01-18 20:32:26 -0800 | [diff] [blame] | 1517 | if (rc == 0) { |
| 1518 | restart_successful = 1; |
| 1519 | } |
| 1520 | |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1521 | return rc; |
| 1522 | } |
| 1523 | |
Paul Lawrence | f4faa57 | 2014-01-29 13:31:03 -0800 | [diff] [blame] | 1524 | int cryptfs_restart(void) |
| 1525 | { |
| 1526 | /* Call internal implementation forcing a restart of main service group */ |
| 1527 | return cryptfs_restart_internal(1); |
| 1528 | } |
| 1529 | |
Mark Salyzyn | 3e97127 | 2014-01-21 13:27:04 -0800 | [diff] [blame] | 1530 | static int do_crypto_complete(char *mount_point UNUSED) |
Ken Sumrall | 7f7dbaa | 2011-02-01 15:46:41 -0800 | [diff] [blame] | 1531 | { |
| 1532 | struct crypt_mnt_ftr crypt_ftr; |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 1533 | char encrypted_state[PROPERTY_VALUE_MAX]; |
Ken Sumrall | e1a4585 | 2011-12-14 21:24:27 -0800 | [diff] [blame] | 1534 | char key_loc[PROPERTY_VALUE_MAX]; |
Ken Sumrall | 7f7dbaa | 2011-02-01 15:46:41 -0800 | [diff] [blame] | 1535 | |
| 1536 | property_get("ro.crypto.state", encrypted_state, ""); |
| 1537 | if (strcmp(encrypted_state, "encrypted") ) { |
| 1538 | SLOGE("not running with encryption, aborting"); |
| 1539 | return 1; |
| 1540 | } |
| 1541 | |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 1542 | if (get_crypt_ftr_and_key(&crypt_ftr)) { |
Ken Sumrall | 56ad03c | 2013-02-13 13:00:19 -0800 | [diff] [blame] | 1543 | fs_mgr_get_crypt_info(fstab, key_loc, 0, sizeof(key_loc)); |
Ken Sumrall | e5032c4 | 2012-04-01 23:58:44 -0700 | [diff] [blame] | 1544 | |
Ken Sumrall | e1a4585 | 2011-12-14 21:24:27 -0800 | [diff] [blame] | 1545 | /* |
| 1546 | * Only report this error if key_loc is a file and it exists. |
| 1547 | * If the device was never encrypted, and /data is not mountable for |
| 1548 | * some reason, returning 1 should prevent the UI from presenting the |
| 1549 | * a "enter password" screen, or worse, a "press button to wipe the |
| 1550 | * device" screen. |
| 1551 | */ |
| 1552 | if ((key_loc[0] == '/') && (access("key_loc", F_OK) == -1)) { |
| 1553 | SLOGE("master key file does not exist, aborting"); |
| 1554 | return 1; |
| 1555 | } else { |
| 1556 | SLOGE("Error getting crypt footer and key\n"); |
| 1557 | return -1; |
| 1558 | } |
Ken Sumrall | 7f7dbaa | 2011-02-01 15:46:41 -0800 | [diff] [blame] | 1559 | } |
| 1560 | |
Paul Lawrence | 6bfed20 | 2014-07-28 12:47:22 -0700 | [diff] [blame] | 1561 | if (crypt_ftr.flags |
| 1562 | & (CRYPT_ENCRYPTION_IN_PROGRESS | CRYPT_INCONSISTENT_STATE)) { |
Ken Sumrall | 7f7dbaa | 2011-02-01 15:46:41 -0800 | [diff] [blame] | 1563 | SLOGE("Encryption process didn't finish successfully\n"); |
| 1564 | return -2; /* -2 is the clue to the UI that there is no usable data on the disk, |
| 1565 | * and give the user an option to wipe the disk */ |
| 1566 | } |
| 1567 | |
| 1568 | /* We passed the test! We shall diminish, and return to the west */ |
| 1569 | return 0; |
| 1570 | } |
| 1571 | |
Paul Lawrence | f4faa57 | 2014-01-29 13:31:03 -0800 | [diff] [blame] | 1572 | static int test_mount_encrypted_fs(struct crypt_mnt_ftr* crypt_ftr, |
| 1573 | char *passwd, char *mount_point, char *label) |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1574 | { |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1575 | /* Allocate enough space for a 256 bit key, but we may use less */ |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 1576 | unsigned char decrypted_master_key[32]; |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1577 | char crypto_blkdev[MAXPATHLEN]; |
| 1578 | char real_blkdev[MAXPATHLEN]; |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1579 | char tmp_mount_point[64]; |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1580 | unsigned int orig_failed_decrypt_count; |
| 1581 | int rc; |
Kenny Root | c4c70f1 | 2013-06-14 12:11:38 -0700 | [diff] [blame] | 1582 | kdf_func kdf; |
| 1583 | void *kdf_params; |
Paul Lawrence | 69f4ebd | 2014-04-14 12:17:14 -0700 | [diff] [blame] | 1584 | int use_keymaster = 0; |
| 1585 | int upgrade = 0; |
Paul Lawrence | d0c7b17 | 2014-08-08 14:28:10 -0700 | [diff] [blame^] | 1586 | unsigned char* intermediate_key = 0; |
| 1587 | size_t intermediate_key_size = 0; |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1588 | |
Paul Lawrence | f4faa57 | 2014-01-29 13:31:03 -0800 | [diff] [blame] | 1589 | SLOGD("crypt_ftr->fs_size = %lld\n", crypt_ftr->fs_size); |
| 1590 | orig_failed_decrypt_count = crypt_ftr->failed_decrypt_count; |
Ken Sumrall | 0cc1663 | 2011-01-18 20:32:26 -0800 | [diff] [blame] | 1591 | |
Paul Lawrence | f4faa57 | 2014-01-29 13:31:03 -0800 | [diff] [blame] | 1592 | if (! (crypt_ftr->flags & CRYPT_MNT_KEY_UNENCRYPTED) ) { |
Paul Lawrence | d0c7b17 | 2014-08-08 14:28:10 -0700 | [diff] [blame^] | 1593 | if (decrypt_master_key(passwd, decrypted_master_key, crypt_ftr, |
| 1594 | &intermediate_key, &intermediate_key_size)) { |
JP Abgrall | 7bdfa52 | 2013-11-15 13:42:56 -0800 | [diff] [blame] | 1595 | SLOGE("Failed to decrypt master key\n"); |
Paul Lawrence | d0c7b17 | 2014-08-08 14:28:10 -0700 | [diff] [blame^] | 1596 | rc = -1; |
| 1597 | goto errout; |
JP Abgrall | 7bdfa52 | 2013-11-15 13:42:56 -0800 | [diff] [blame] | 1598 | } |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1599 | } |
| 1600 | |
Paul Lawrence | f4faa57 | 2014-01-29 13:31:03 -0800 | [diff] [blame] | 1601 | fs_mgr_get_crypt_info(fstab, 0, real_blkdev, sizeof(real_blkdev)); |
| 1602 | |
| 1603 | if (create_crypto_blk_dev(crypt_ftr, decrypted_master_key, |
| 1604 | real_blkdev, crypto_blkdev, label)) { |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1605 | SLOGE("Error creating decrypted block device\n"); |
Paul Lawrence | d0c7b17 | 2014-08-08 14:28:10 -0700 | [diff] [blame^] | 1606 | rc = -1; |
| 1607 | goto errout; |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1608 | } |
| 1609 | |
Alex Klyubin | 707795a | 2013-05-10 15:17:07 -0700 | [diff] [blame] | 1610 | /* If init detects an encrypted filesystem, it writes a file for each such |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1611 | * encrypted fs into the tmpfs /data filesystem, and then the framework finds those |
| 1612 | * files and passes that data to me */ |
| 1613 | /* Create a tmp mount point to try mounting the decryptd fs |
| 1614 | * Since we're here, the mount_point should be a tmpfs filesystem, so make |
| 1615 | * a directory in it to test mount the decrypted filesystem. |
| 1616 | */ |
| 1617 | sprintf(tmp_mount_point, "%s/tmp_mnt", mount_point); |
| 1618 | mkdir(tmp_mount_point, 0755); |
Ken Sumrall | 56ad03c | 2013-02-13 13:00:19 -0800 | [diff] [blame] | 1619 | if (fs_mgr_do_mount(fstab, DATA_MNT_POINT, crypto_blkdev, tmp_mount_point)) { |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1620 | SLOGE("Error temp mounting decrypted block device\n"); |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 1621 | delete_crypto_blk_dev(label); |
Paul Lawrence | d0c7b17 | 2014-08-08 14:28:10 -0700 | [diff] [blame^] | 1622 | |
| 1623 | /* Work out if the problem is the password or the data */ |
| 1624 | unsigned char scrypted_intermediate_key[sizeof(crypt_ftr-> |
| 1625 | scrypted_intermediate_key)]; |
| 1626 | int N = 1 << crypt_ftr->N_factor; |
| 1627 | int r = 1 << crypt_ftr->r_factor; |
| 1628 | int p = 1 << crypt_ftr->p_factor; |
| 1629 | |
| 1630 | rc = crypto_scrypt(intermediate_key, intermediate_key_size, |
| 1631 | crypt_ftr->salt, sizeof(crypt_ftr->salt), |
| 1632 | N, r, p, scrypted_intermediate_key, |
| 1633 | sizeof(scrypted_intermediate_key)); |
| 1634 | if (rc == 0 && memcmp(scrypted_intermediate_key, |
| 1635 | crypt_ftr->scrypted_intermediate_key, |
| 1636 | sizeof(scrypted_intermediate_key)) == 0) { |
| 1637 | SLOGE("Right password, so wipe"); |
| 1638 | rc = -1; |
| 1639 | } else { |
| 1640 | SLOGE(rc ? "scrypt failure, so allow retry" : |
| 1641 | "Wrong password, so allow retry"); |
| 1642 | rc = ++crypt_ftr->failed_decrypt_count; |
| 1643 | put_crypt_ftr_and_key(crypt_ftr); |
| 1644 | } |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1645 | } else { |
Paul Lawrence | d0c7b17 | 2014-08-08 14:28:10 -0700 | [diff] [blame^] | 1646 | /* Success! |
| 1647 | * umount and we'll mount it properly when we restart the framework. |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1648 | */ |
| 1649 | umount(tmp_mount_point); |
Paul Lawrence | f4faa57 | 2014-01-29 13:31:03 -0800 | [diff] [blame] | 1650 | crypt_ftr->failed_decrypt_count = 0; |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1651 | |
Paul Lawrence | d0c7b17 | 2014-08-08 14:28:10 -0700 | [diff] [blame^] | 1652 | /* Save the name of the crypto block device |
Ken Sumrall | 6864b7e | 2011-01-14 15:20:02 -0800 | [diff] [blame] | 1653 | * so we can mount it when restarting the framework. |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1654 | */ |
Ken Sumrall | 6864b7e | 2011-01-14 15:20:02 -0800 | [diff] [blame] | 1655 | property_set("ro.crypto.fs_crypto_blkdev", crypto_blkdev); |
Jason parks | 70a4b3f | 2011-01-28 10:10:47 -0600 | [diff] [blame] | 1656 | |
| 1657 | /* Also save a the master key so we can reencrypted the key |
| 1658 | * the key when we want to change the password on it. |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 1659 | */ |
Jason parks | 70a4b3f | 2011-01-28 10:10:47 -0600 | [diff] [blame] | 1660 | memcpy(saved_master_key, decrypted_master_key, KEY_LEN_BYTES); |
Ken Sumrall | 3ad9072 | 2011-10-04 20:38:29 -0700 | [diff] [blame] | 1661 | saved_mount_point = strdup(mount_point); |
Jason parks | 70a4b3f | 2011-01-28 10:10:47 -0600 | [diff] [blame] | 1662 | master_key_saved = 1; |
JP Abgrall | 7bdfa52 | 2013-11-15 13:42:56 -0800 | [diff] [blame] | 1663 | SLOGD("%s(): Master key saved\n", __FUNCTION__); |
Ken Sumrall | 6864b7e | 2011-01-14 15:20:02 -0800 | [diff] [blame] | 1664 | rc = 0; |
Paul Lawrence | 69f4ebd | 2014-04-14 12:17:14 -0700 | [diff] [blame] | 1665 | |
JP Abgrall | 7bdfa52 | 2013-11-15 13:42:56 -0800 | [diff] [blame] | 1666 | /* |
| 1667 | * Upgrade if we're not using the latest KDF. |
| 1668 | */ |
Paul Lawrence | 69f4ebd | 2014-04-14 12:17:14 -0700 | [diff] [blame] | 1669 | use_keymaster = keymaster_check_compatibility(); |
| 1670 | if (crypt_ftr->kdf_type == KDF_SCRYPT_KEYMASTER) { |
| 1671 | // Don't allow downgrade to KDF_SCRYPT |
| 1672 | } else if (use_keymaster == 1 && crypt_ftr->kdf_type != KDF_SCRYPT_KEYMASTER) { |
| 1673 | crypt_ftr->kdf_type = KDF_SCRYPT_KEYMASTER; |
| 1674 | upgrade = 1; |
| 1675 | } else if (use_keymaster == 0 && crypt_ftr->kdf_type != KDF_SCRYPT) { |
Paul Lawrence | f4faa57 | 2014-01-29 13:31:03 -0800 | [diff] [blame] | 1676 | crypt_ftr->kdf_type = KDF_SCRYPT; |
Paul Lawrence | 69f4ebd | 2014-04-14 12:17:14 -0700 | [diff] [blame] | 1677 | upgrade = 1; |
| 1678 | } |
| 1679 | |
| 1680 | if (upgrade) { |
Paul Lawrence | f4faa57 | 2014-01-29 13:31:03 -0800 | [diff] [blame] | 1681 | rc = encrypt_master_key(passwd, crypt_ftr->salt, saved_master_key, |
| 1682 | crypt_ftr->master_key, crypt_ftr); |
JP Abgrall | 7bdfa52 | 2013-11-15 13:42:56 -0800 | [diff] [blame] | 1683 | if (!rc) { |
Paul Lawrence | f4faa57 | 2014-01-29 13:31:03 -0800 | [diff] [blame] | 1684 | rc = put_crypt_ftr_and_key(crypt_ftr); |
JP Abgrall | 7bdfa52 | 2013-11-15 13:42:56 -0800 | [diff] [blame] | 1685 | } |
| 1686 | SLOGD("Key Derivation Function upgrade: rc=%d\n", rc); |
| 1687 | } |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1688 | } |
| 1689 | |
Paul Lawrence | d0c7b17 | 2014-08-08 14:28:10 -0700 | [diff] [blame^] | 1690 | errout: |
| 1691 | if (intermediate_key) { |
| 1692 | memset(intermediate_key, 0, intermediate_key_size); |
| 1693 | free(intermediate_key); |
| 1694 | } |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1695 | return rc; |
| 1696 | } |
| 1697 | |
Ken Sumrall | 0b8b597 | 2011-08-31 16:14:23 -0700 | [diff] [blame] | 1698 | /* Called by vold when it wants to undo the crypto mapping of a volume it |
| 1699 | * manages. This is usually in response to a factory reset, when we want |
| 1700 | * to undo the crypto mapping so the volume is formatted in the clear. |
| 1701 | */ |
| 1702 | int cryptfs_revert_volume(const char *label) |
| 1703 | { |
| 1704 | return delete_crypto_blk_dev((char *)label); |
| 1705 | } |
| 1706 | |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 1707 | /* |
| 1708 | * Called by vold when it's asked to mount an encrypted, nonremovable volume. |
| 1709 | * Setup a dm-crypt mapping, use the saved master key from |
| 1710 | * setting up the /data mapping, and return the new device path. |
| 1711 | */ |
| 1712 | int cryptfs_setup_volume(const char *label, int major, int minor, |
| 1713 | char *crypto_sys_path, unsigned int max_path, |
| 1714 | int *new_major, int *new_minor) |
| 1715 | { |
| 1716 | char real_blkdev[MAXPATHLEN], crypto_blkdev[MAXPATHLEN]; |
| 1717 | struct crypt_mnt_ftr sd_crypt_ftr; |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 1718 | struct stat statbuf; |
| 1719 | int nr_sec, fd; |
| 1720 | |
| 1721 | sprintf(real_blkdev, "/dev/block/vold/%d:%d", major, minor); |
| 1722 | |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 1723 | get_crypt_ftr_and_key(&sd_crypt_ftr); |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 1724 | |
| 1725 | /* Update the fs_size field to be the size of the volume */ |
| 1726 | fd = open(real_blkdev, O_RDONLY); |
| 1727 | nr_sec = get_blkdev_size(fd); |
| 1728 | close(fd); |
| 1729 | if (nr_sec == 0) { |
| 1730 | SLOGE("Cannot get size of volume %s\n", real_blkdev); |
| 1731 | return -1; |
| 1732 | } |
| 1733 | |
| 1734 | sd_crypt_ftr.fs_size = nr_sec; |
| 1735 | create_crypto_blk_dev(&sd_crypt_ftr, saved_master_key, real_blkdev, |
| 1736 | crypto_blkdev, label); |
| 1737 | |
| 1738 | stat(crypto_blkdev, &statbuf); |
| 1739 | *new_major = MAJOR(statbuf.st_rdev); |
| 1740 | *new_minor = MINOR(statbuf.st_rdev); |
| 1741 | |
| 1742 | /* Create path to sys entry for this block device */ |
| 1743 | snprintf(crypto_sys_path, max_path, "/devices/virtual/block/%s", strrchr(crypto_blkdev, '/')+1); |
| 1744 | |
| 1745 | return 0; |
| 1746 | } |
| 1747 | |
Ken Sumrall | 7f7dbaa | 2011-02-01 15:46:41 -0800 | [diff] [blame] | 1748 | int cryptfs_crypto_complete(void) |
| 1749 | { |
| 1750 | return do_crypto_complete("/data"); |
| 1751 | } |
| 1752 | |
Paul Lawrence | f4faa57 | 2014-01-29 13:31:03 -0800 | [diff] [blame] | 1753 | int check_unmounted_and_get_ftr(struct crypt_mnt_ftr* crypt_ftr) |
| 1754 | { |
| 1755 | char encrypted_state[PROPERTY_VALUE_MAX]; |
| 1756 | property_get("ro.crypto.state", encrypted_state, ""); |
| 1757 | if ( master_key_saved || strcmp(encrypted_state, "encrypted") ) { |
| 1758 | SLOGE("encrypted fs already validated or not running with encryption," |
| 1759 | " aborting"); |
| 1760 | return -1; |
| 1761 | } |
| 1762 | |
| 1763 | if (get_crypt_ftr_and_key(crypt_ftr)) { |
| 1764 | SLOGE("Error getting crypt footer and key"); |
| 1765 | return -1; |
| 1766 | } |
| 1767 | |
| 1768 | return 0; |
| 1769 | } |
| 1770 | |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1771 | int cryptfs_check_passwd(char *passwd) |
| 1772 | { |
Paul Lawrence | f4faa57 | 2014-01-29 13:31:03 -0800 | [diff] [blame] | 1773 | struct crypt_mnt_ftr crypt_ftr; |
| 1774 | int rc; |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1775 | |
Paul Lawrence | f4faa57 | 2014-01-29 13:31:03 -0800 | [diff] [blame] | 1776 | rc = check_unmounted_and_get_ftr(&crypt_ftr); |
| 1777 | if (rc) |
| 1778 | return rc; |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1779 | |
Paul Lawrence | f4faa57 | 2014-01-29 13:31:03 -0800 | [diff] [blame] | 1780 | rc = test_mount_encrypted_fs(&crypt_ftr, passwd, |
| 1781 | DATA_MNT_POINT, "userdata"); |
Paul Lawrence | 684dbdf | 2014-02-07 12:07:22 -0800 | [diff] [blame] | 1782 | |
| 1783 | if (rc == 0 && crypt_ftr.crypt_type != CRYPT_TYPE_DEFAULT) { |
Paul Lawrence | 399317e | 2014-03-10 13:20:50 -0700 | [diff] [blame] | 1784 | cryptfs_clear_password(); |
| 1785 | password = strdup(passwd); |
| 1786 | struct timespec now; |
| 1787 | clock_gettime(CLOCK_BOOTTIME, &now); |
| 1788 | password_expiry_time = now.tv_sec + password_max_age_seconds; |
Paul Lawrence | 684dbdf | 2014-02-07 12:07:22 -0800 | [diff] [blame] | 1789 | } |
| 1790 | |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1791 | return rc; |
| 1792 | } |
| 1793 | |
Ken Sumrall | 3ad9072 | 2011-10-04 20:38:29 -0700 | [diff] [blame] | 1794 | int cryptfs_verify_passwd(char *passwd) |
| 1795 | { |
| 1796 | struct crypt_mnt_ftr crypt_ftr; |
| 1797 | /* Allocate enough space for a 256 bit key, but we may use less */ |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 1798 | unsigned char decrypted_master_key[32]; |
Ken Sumrall | 3ad9072 | 2011-10-04 20:38:29 -0700 | [diff] [blame] | 1799 | char encrypted_state[PROPERTY_VALUE_MAX]; |
| 1800 | int rc; |
| 1801 | |
| 1802 | property_get("ro.crypto.state", encrypted_state, ""); |
| 1803 | if (strcmp(encrypted_state, "encrypted") ) { |
| 1804 | SLOGE("device not encrypted, aborting"); |
| 1805 | return -2; |
| 1806 | } |
| 1807 | |
| 1808 | if (!master_key_saved) { |
| 1809 | SLOGE("encrypted fs not yet mounted, aborting"); |
| 1810 | return -1; |
| 1811 | } |
| 1812 | |
| 1813 | if (!saved_mount_point) { |
| 1814 | SLOGE("encrypted fs failed to save mount point, aborting"); |
| 1815 | return -1; |
| 1816 | } |
| 1817 | |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 1818 | if (get_crypt_ftr_and_key(&crypt_ftr)) { |
Ken Sumrall | 3ad9072 | 2011-10-04 20:38:29 -0700 | [diff] [blame] | 1819 | SLOGE("Error getting crypt footer and key\n"); |
| 1820 | return -1; |
| 1821 | } |
| 1822 | |
| 1823 | if (crypt_ftr.flags & CRYPT_MNT_KEY_UNENCRYPTED) { |
| 1824 | /* If the device has no password, then just say the password is valid */ |
| 1825 | rc = 0; |
| 1826 | } else { |
Paul Lawrence | d0c7b17 | 2014-08-08 14:28:10 -0700 | [diff] [blame^] | 1827 | decrypt_master_key(passwd, decrypted_master_key, &crypt_ftr, 0, 0); |
Ken Sumrall | 3ad9072 | 2011-10-04 20:38:29 -0700 | [diff] [blame] | 1828 | if (!memcmp(decrypted_master_key, saved_master_key, crypt_ftr.keysize)) { |
| 1829 | /* They match, the password is correct */ |
| 1830 | rc = 0; |
| 1831 | } else { |
| 1832 | /* If incorrect, sleep for a bit to prevent dictionary attacks */ |
| 1833 | sleep(1); |
| 1834 | rc = 1; |
| 1835 | } |
| 1836 | } |
| 1837 | |
| 1838 | return rc; |
| 1839 | } |
| 1840 | |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1841 | /* Initialize a crypt_mnt_ftr structure. The keysize is |
| 1842 | * defaulted to 16 bytes, and the filesystem size to 0. |
| 1843 | * Presumably, at a minimum, the caller will update the |
| 1844 | * filesystem size and crypto_type_name after calling this function. |
| 1845 | */ |
Paul Lawrence | 69f4ebd | 2014-04-14 12:17:14 -0700 | [diff] [blame] | 1846 | static int cryptfs_init_crypt_mnt_ftr(struct crypt_mnt_ftr *ftr) |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1847 | { |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 1848 | off64_t off; |
| 1849 | |
| 1850 | memset(ftr, 0, sizeof(struct crypt_mnt_ftr)); |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1851 | ftr->magic = CRYPT_MNT_MAGIC; |
Kenny Root | c96a5f8 | 2013-06-14 12:08:28 -0700 | [diff] [blame] | 1852 | ftr->major_version = CURRENT_MAJOR_VERSION; |
| 1853 | ftr->minor_version = CURRENT_MINOR_VERSION; |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1854 | ftr->ftr_size = sizeof(struct crypt_mnt_ftr); |
Jason parks | 70a4b3f | 2011-01-28 10:10:47 -0600 | [diff] [blame] | 1855 | ftr->keysize = KEY_LEN_BYTES; |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 1856 | |
Paul Lawrence | 69f4ebd | 2014-04-14 12:17:14 -0700 | [diff] [blame] | 1857 | switch (keymaster_check_compatibility()) { |
| 1858 | case 1: |
| 1859 | ftr->kdf_type = KDF_SCRYPT_KEYMASTER; |
| 1860 | break; |
| 1861 | |
| 1862 | case 0: |
| 1863 | ftr->kdf_type = KDF_SCRYPT; |
| 1864 | break; |
| 1865 | |
| 1866 | default: |
| 1867 | SLOGE("keymaster_check_compatibility failed"); |
| 1868 | return -1; |
| 1869 | } |
| 1870 | |
Kenny Root | c4c70f1 | 2013-06-14 12:11:38 -0700 | [diff] [blame] | 1871 | get_device_scrypt_params(ftr); |
| 1872 | |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 1873 | ftr->persist_data_size = CRYPT_PERSIST_DATA_SIZE; |
| 1874 | if (get_crypt_ftr_info(NULL, &off) == 0) { |
| 1875 | ftr->persist_data_offset[0] = off + CRYPT_FOOTER_TO_PERSIST_OFFSET; |
| 1876 | ftr->persist_data_offset[1] = off + CRYPT_FOOTER_TO_PERSIST_OFFSET + |
| 1877 | ftr->persist_data_size; |
| 1878 | } |
Paul Lawrence | 69f4ebd | 2014-04-14 12:17:14 -0700 | [diff] [blame] | 1879 | |
| 1880 | return 0; |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1881 | } |
| 1882 | |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 1883 | static int cryptfs_enable_wipe(char *crypto_blkdev, off64_t size, int type) |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1884 | { |
Ken Sumrall | e550f78 | 2013-08-20 13:48:23 -0700 | [diff] [blame] | 1885 | const char *args[10]; |
| 1886 | char size_str[32]; /* Must be large enough to hold a %lld and null byte */ |
| 1887 | int num_args; |
| 1888 | int status; |
| 1889 | int tmp; |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1890 | int rc = -1; |
| 1891 | |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 1892 | if (type == EXT4_FS) { |
Ken Sumrall | e550f78 | 2013-08-20 13:48:23 -0700 | [diff] [blame] | 1893 | args[0] = "/system/bin/make_ext4fs"; |
| 1894 | args[1] = "-a"; |
| 1895 | args[2] = "/data"; |
| 1896 | args[3] = "-l"; |
Elliott Hughes | 7373716 | 2014-06-25 17:27:42 -0700 | [diff] [blame] | 1897 | snprintf(size_str, sizeof(size_str), "%" PRId64, size * 512); |
Ken Sumrall | e550f78 | 2013-08-20 13:48:23 -0700 | [diff] [blame] | 1898 | args[4] = size_str; |
| 1899 | args[5] = crypto_blkdev; |
| 1900 | num_args = 6; |
| 1901 | SLOGI("Making empty filesystem with command %s %s %s %s %s %s\n", |
| 1902 | args[0], args[1], args[2], args[3], args[4], args[5]); |
JP Abgrall | 62c7af3 | 2014-06-16 13:01:23 -0700 | [diff] [blame] | 1903 | } else if (type == F2FS_FS) { |
| 1904 | args[0] = "/system/bin/mkfs.f2fs"; |
| 1905 | args[1] = "-t"; |
| 1906 | args[2] = "-d1"; |
| 1907 | args[3] = crypto_blkdev; |
Elliott Hughes | 7373716 | 2014-06-25 17:27:42 -0700 | [diff] [blame] | 1908 | snprintf(size_str, sizeof(size_str), "%" PRId64, size); |
JP Abgrall | 62c7af3 | 2014-06-16 13:01:23 -0700 | [diff] [blame] | 1909 | args[4] = size_str; |
| 1910 | num_args = 5; |
| 1911 | SLOGI("Making empty filesystem with command %s %s %s %s %s\n", |
| 1912 | args[0], args[1], args[2], args[3], args[4]); |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 1913 | } else { |
| 1914 | SLOGE("cryptfs_enable_wipe(): unknown filesystem type %d\n", type); |
| 1915 | return -1; |
| 1916 | } |
| 1917 | |
Ken Sumrall | e550f78 | 2013-08-20 13:48:23 -0700 | [diff] [blame] | 1918 | tmp = android_fork_execvp(num_args, (char **)args, &status, false, true); |
| 1919 | |
| 1920 | if (tmp != 0) { |
| 1921 | SLOGE("Error creating empty filesystem on %s due to logwrap error\n", crypto_blkdev); |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1922 | } else { |
Ken Sumrall | e550f78 | 2013-08-20 13:48:23 -0700 | [diff] [blame] | 1923 | if (WIFEXITED(status)) { |
| 1924 | if (WEXITSTATUS(status)) { |
| 1925 | SLOGE("Error creating filesystem on %s, exit status %d ", |
| 1926 | crypto_blkdev, WEXITSTATUS(status)); |
| 1927 | } else { |
| 1928 | SLOGD("Successfully created filesystem on %s\n", crypto_blkdev); |
| 1929 | rc = 0; |
| 1930 | } |
| 1931 | } else { |
| 1932 | SLOGE("Error creating filesystem on %s, did not exit normally\n", crypto_blkdev); |
| 1933 | } |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1934 | } |
| 1935 | |
| 1936 | return rc; |
| 1937 | } |
| 1938 | |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 1939 | #define CRYPT_INPLACE_BUFSIZE 4096 |
Paul Lawrence | 8799917 | 2014-02-20 12:21:31 -0800 | [diff] [blame] | 1940 | #define CRYPT_SECTORS_PER_BUFSIZE (CRYPT_INPLACE_BUFSIZE / CRYPT_SECTOR_SIZE) |
| 1941 | #define CRYPT_SECTOR_SIZE 512 |
Paul Lawrence | ae59fe6 | 2014-01-21 08:23:27 -0800 | [diff] [blame] | 1942 | |
| 1943 | /* aligned 32K writes tends to make flash happy. |
| 1944 | * SD card association recommends it. |
| 1945 | */ |
| 1946 | #define BLOCKS_AT_A_TIME 8 |
| 1947 | |
| 1948 | struct encryptGroupsData |
| 1949 | { |
| 1950 | int realfd; |
| 1951 | int cryptofd; |
| 1952 | off64_t numblocks; |
| 1953 | off64_t one_pct, cur_pct, new_pct; |
| 1954 | off64_t blocks_already_done, tot_numblocks; |
Paul Lawrence | 58c58cf | 2014-06-04 13:12:21 -0700 | [diff] [blame] | 1955 | off64_t used_blocks_already_done, tot_used_blocks; |
Paul Lawrence | ae59fe6 | 2014-01-21 08:23:27 -0800 | [diff] [blame] | 1956 | char* real_blkdev, * crypto_blkdev; |
| 1957 | int count; |
| 1958 | off64_t offset; |
| 1959 | char* buffer; |
Paul Lawrence | 8799917 | 2014-02-20 12:21:31 -0800 | [diff] [blame] | 1960 | off64_t last_written_sector; |
| 1961 | int completed; |
Paul Lawrence | a96d9c9 | 2014-06-04 14:05:01 -0700 | [diff] [blame] | 1962 | time_t time_started; |
| 1963 | int remaining_time; |
Paul Lawrence | ae59fe6 | 2014-01-21 08:23:27 -0800 | [diff] [blame] | 1964 | }; |
| 1965 | |
Paul Lawrence | 58c58cf | 2014-06-04 13:12:21 -0700 | [diff] [blame] | 1966 | static void update_progress(struct encryptGroupsData* data, int is_used) |
Paul Lawrence | ae59fe6 | 2014-01-21 08:23:27 -0800 | [diff] [blame] | 1967 | { |
| 1968 | data->blocks_already_done++; |
Paul Lawrence | 58c58cf | 2014-06-04 13:12:21 -0700 | [diff] [blame] | 1969 | |
| 1970 | if (is_used) { |
| 1971 | data->used_blocks_already_done++; |
| 1972 | } |
| 1973 | |
| 1974 | if (data->tot_used_blocks) { |
| 1975 | data->new_pct = data->used_blocks_already_done / data->one_pct; |
| 1976 | } else { |
| 1977 | data->new_pct = data->blocks_already_done / data->one_pct; |
| 1978 | } |
| 1979 | |
Paul Lawrence | ae59fe6 | 2014-01-21 08:23:27 -0800 | [diff] [blame] | 1980 | if (data->new_pct > data->cur_pct) { |
| 1981 | char buf[8]; |
| 1982 | data->cur_pct = data->new_pct; |
Elliott Hughes | cb33f57 | 2014-06-25 18:25:11 -0700 | [diff] [blame] | 1983 | snprintf(buf, sizeof(buf), "%" PRId64, data->cur_pct); |
Paul Lawrence | ae59fe6 | 2014-01-21 08:23:27 -0800 | [diff] [blame] | 1984 | property_set("vold.encrypt_progress", buf); |
Elliott Hughes | cb33f57 | 2014-06-25 18:25:11 -0700 | [diff] [blame] | 1985 | SLOGI("Encrypted %" PRId64 " percent of drive", data->cur_pct); |
Paul Lawrence | ae59fe6 | 2014-01-21 08:23:27 -0800 | [diff] [blame] | 1986 | } |
Paul Lawrence | a96d9c9 | 2014-06-04 14:05:01 -0700 | [diff] [blame] | 1987 | |
| 1988 | if (data->cur_pct >= 5) { |
| 1989 | double elapsed_time = difftime(time(NULL), data->time_started); |
| 1990 | off64_t remaining_blocks = data->tot_used_blocks |
| 1991 | - data->used_blocks_already_done; |
| 1992 | int remaining_time = (int)(elapsed_time * remaining_blocks |
| 1993 | / data->used_blocks_already_done); |
| 1994 | if (data->remaining_time == -1 |
| 1995 | || remaining_time < data->remaining_time) { |
| 1996 | char buf[8]; |
| 1997 | snprintf(buf, sizeof(buf), "%d", remaining_time); |
| 1998 | property_set("vold.encrypt_time_remaining", buf); |
| 1999 | |
Elliott Hughes | cb33f57 | 2014-06-25 18:25:11 -0700 | [diff] [blame] | 2000 | SLOGI("Encrypted %" PRId64 " percent of drive, %d seconds to go", |
Paul Lawrence | a96d9c9 | 2014-06-04 14:05:01 -0700 | [diff] [blame] | 2001 | data->cur_pct, remaining_time); |
| 2002 | data->remaining_time = remaining_time; |
| 2003 | } |
| 2004 | } |
Paul Lawrence | ae59fe6 | 2014-01-21 08:23:27 -0800 | [diff] [blame] | 2005 | } |
| 2006 | |
| 2007 | static int flush_outstanding_data(struct encryptGroupsData* data) |
| 2008 | { |
| 2009 | if (data->count == 0) { |
| 2010 | return 0; |
| 2011 | } |
| 2012 | |
Elliott Hughes | 231bdba | 2014-06-25 18:36:19 -0700 | [diff] [blame] | 2013 | SLOGV("Copying %d blocks at offset %" PRIx64, data->count, data->offset); |
Paul Lawrence | ae59fe6 | 2014-01-21 08:23:27 -0800 | [diff] [blame] | 2014 | |
| 2015 | if (pread64(data->realfd, data->buffer, |
| 2016 | info.block_size * data->count, data->offset) |
| 2017 | <= 0) { |
| 2018 | SLOGE("Error reading real_blkdev %s for inplace encrypt", |
| 2019 | data->real_blkdev); |
| 2020 | return -1; |
| 2021 | } |
| 2022 | |
| 2023 | if (pwrite64(data->cryptofd, data->buffer, |
| 2024 | info.block_size * data->count, data->offset) |
| 2025 | <= 0) { |
| 2026 | SLOGE("Error writing crypto_blkdev %s for inplace encrypt", |
| 2027 | data->crypto_blkdev); |
| 2028 | return -1; |
Paul Lawrence | 8799917 | 2014-02-20 12:21:31 -0800 | [diff] [blame] | 2029 | } else { |
Elliott Hughes | cb33f57 | 2014-06-25 18:25:11 -0700 | [diff] [blame] | 2030 | SLOGI("Encrypted %d blocks at sector %" PRId64, |
Paul Lawrence | 8799917 | 2014-02-20 12:21:31 -0800 | [diff] [blame] | 2031 | data->count, data->offset / info.block_size * CRYPT_SECTOR_SIZE); |
Paul Lawrence | ae59fe6 | 2014-01-21 08:23:27 -0800 | [diff] [blame] | 2032 | } |
| 2033 | |
| 2034 | data->count = 0; |
Paul Lawrence | 8799917 | 2014-02-20 12:21:31 -0800 | [diff] [blame] | 2035 | data->last_written_sector = (data->offset + data->count) |
| 2036 | / info.block_size * CRYPT_SECTOR_SIZE - 1; |
Paul Lawrence | ae59fe6 | 2014-01-21 08:23:27 -0800 | [diff] [blame] | 2037 | return 0; |
| 2038 | } |
| 2039 | |
| 2040 | static int encrypt_groups(struct encryptGroupsData* data) |
| 2041 | { |
| 2042 | unsigned int i; |
| 2043 | u8 *block_bitmap = 0; |
| 2044 | unsigned int block; |
| 2045 | off64_t ret; |
| 2046 | int rc = -1; |
| 2047 | |
| 2048 | data->buffer = malloc(info.block_size * BLOCKS_AT_A_TIME); |
| 2049 | if (!data->buffer) { |
| 2050 | SLOGE("Failed to allocate crypto buffer"); |
| 2051 | goto errout; |
| 2052 | } |
| 2053 | |
| 2054 | block_bitmap = malloc(info.block_size); |
| 2055 | if (!block_bitmap) { |
| 2056 | SLOGE("failed to allocate block bitmap"); |
| 2057 | goto errout; |
| 2058 | } |
| 2059 | |
| 2060 | for (i = 0; i < aux_info.groups; ++i) { |
| 2061 | SLOGI("Encrypting group %d", i); |
| 2062 | |
| 2063 | u32 first_block = aux_info.first_data_block + i * info.blocks_per_group; |
| 2064 | u32 block_count = min(info.blocks_per_group, |
| 2065 | aux_info.len_blocks - first_block); |
| 2066 | |
| 2067 | off64_t offset = (u64)info.block_size |
| 2068 | * aux_info.bg_desc[i].bg_block_bitmap; |
| 2069 | |
| 2070 | ret = pread64(data->realfd, block_bitmap, info.block_size, offset); |
| 2071 | if (ret != (int)info.block_size) { |
| 2072 | SLOGE("failed to read all of block group bitmap %d", i); |
| 2073 | goto errout; |
| 2074 | } |
| 2075 | |
| 2076 | offset = (u64)info.block_size * first_block; |
| 2077 | |
| 2078 | data->count = 0; |
| 2079 | |
| 2080 | for (block = 0; block < block_count; block++) { |
Paul Lawrence | 58c58cf | 2014-06-04 13:12:21 -0700 | [diff] [blame] | 2081 | int used = bitmap_get_bit(block_bitmap, block); |
| 2082 | update_progress(data, used); |
| 2083 | if (used) { |
Paul Lawrence | ae59fe6 | 2014-01-21 08:23:27 -0800 | [diff] [blame] | 2084 | if (data->count == 0) { |
| 2085 | data->offset = offset; |
| 2086 | } |
| 2087 | data->count++; |
| 2088 | } else { |
| 2089 | if (flush_outstanding_data(data)) { |
| 2090 | goto errout; |
| 2091 | } |
| 2092 | } |
| 2093 | |
| 2094 | offset += info.block_size; |
| 2095 | |
| 2096 | /* Write data if we are aligned or buffer size reached */ |
| 2097 | if (offset % (info.block_size * BLOCKS_AT_A_TIME) == 0 |
| 2098 | || data->count == BLOCKS_AT_A_TIME) { |
| 2099 | if (flush_outstanding_data(data)) { |
| 2100 | goto errout; |
| 2101 | } |
| 2102 | } |
Paul Lawrence | 8799917 | 2014-02-20 12:21:31 -0800 | [diff] [blame] | 2103 | |
Paul Lawrence | 73d7a02 | 2014-06-09 14:10:09 -0700 | [diff] [blame] | 2104 | if (!is_battery_ok_to_continue()) { |
Paul Lawrence | 8799917 | 2014-02-20 12:21:31 -0800 | [diff] [blame] | 2105 | SLOGE("Stopping encryption due to low battery"); |
| 2106 | rc = 0; |
| 2107 | goto errout; |
| 2108 | } |
| 2109 | |
Paul Lawrence | ae59fe6 | 2014-01-21 08:23:27 -0800 | [diff] [blame] | 2110 | } |
| 2111 | if (flush_outstanding_data(data)) { |
| 2112 | goto errout; |
| 2113 | } |
| 2114 | } |
| 2115 | |
Paul Lawrence | 8799917 | 2014-02-20 12:21:31 -0800 | [diff] [blame] | 2116 | data->completed = 1; |
Paul Lawrence | ae59fe6 | 2014-01-21 08:23:27 -0800 | [diff] [blame] | 2117 | rc = 0; |
| 2118 | |
| 2119 | errout: |
| 2120 | free(data->buffer); |
| 2121 | free(block_bitmap); |
| 2122 | return rc; |
| 2123 | } |
| 2124 | |
| 2125 | static int cryptfs_enable_inplace_ext4(char *crypto_blkdev, |
| 2126 | char *real_blkdev, |
| 2127 | off64_t size, |
| 2128 | off64_t *size_already_done, |
Paul Lawrence | 8799917 | 2014-02-20 12:21:31 -0800 | [diff] [blame] | 2129 | off64_t tot_size, |
| 2130 | off64_t previously_encrypted_upto) |
Paul Lawrence | ae59fe6 | 2014-01-21 08:23:27 -0800 | [diff] [blame] | 2131 | { |
Paul Lawrence | 58c58cf | 2014-06-04 13:12:21 -0700 | [diff] [blame] | 2132 | u32 i; |
Paul Lawrence | ae59fe6 | 2014-01-21 08:23:27 -0800 | [diff] [blame] | 2133 | struct encryptGroupsData data; |
| 2134 | int rc = -1; |
| 2135 | |
Paul Lawrence | 8799917 | 2014-02-20 12:21:31 -0800 | [diff] [blame] | 2136 | if (previously_encrypted_upto > *size_already_done) { |
| 2137 | SLOGD("Not fast encrypting since resuming part way through"); |
| 2138 | return -1; |
| 2139 | } |
| 2140 | |
Paul Lawrence | ae59fe6 | 2014-01-21 08:23:27 -0800 | [diff] [blame] | 2141 | memset(&data, 0, sizeof(data)); |
| 2142 | data.real_blkdev = real_blkdev; |
| 2143 | data.crypto_blkdev = crypto_blkdev; |
| 2144 | |
| 2145 | if ( (data.realfd = open(real_blkdev, O_RDWR)) < 0) { |
| 2146 | SLOGE("Error opening real_blkdev %s for inplace encrypt\n", |
| 2147 | real_blkdev); |
| 2148 | goto errout; |
| 2149 | } |
| 2150 | |
| 2151 | if ( (data.cryptofd = open(crypto_blkdev, O_WRONLY)) < 0) { |
| 2152 | SLOGE("Error opening crypto_blkdev %s for inplace encrypt\n", |
| 2153 | crypto_blkdev); |
| 2154 | goto errout; |
| 2155 | } |
| 2156 | |
| 2157 | if (setjmp(setjmp_env)) { |
| 2158 | SLOGE("Reading extent caused an exception"); |
| 2159 | goto errout; |
| 2160 | } |
| 2161 | |
| 2162 | if (read_ext(data.realfd, 0) != 0) { |
| 2163 | SLOGE("Failed to read extent"); |
| 2164 | goto errout; |
| 2165 | } |
| 2166 | |
| 2167 | data.numblocks = size / CRYPT_SECTORS_PER_BUFSIZE; |
| 2168 | data.tot_numblocks = tot_size / CRYPT_SECTORS_PER_BUFSIZE; |
| 2169 | data.blocks_already_done = *size_already_done / CRYPT_SECTORS_PER_BUFSIZE; |
| 2170 | |
| 2171 | SLOGI("Encrypting filesystem in place..."); |
| 2172 | |
Paul Lawrence | 58c58cf | 2014-06-04 13:12:21 -0700 | [diff] [blame] | 2173 | data.tot_used_blocks = data.numblocks; |
| 2174 | for (i = 0; i < aux_info.groups; ++i) { |
| 2175 | data.tot_used_blocks -= aux_info.bg_desc[i].bg_free_blocks_count; |
| 2176 | } |
| 2177 | |
| 2178 | data.one_pct = data.tot_used_blocks / 100; |
Paul Lawrence | ae59fe6 | 2014-01-21 08:23:27 -0800 | [diff] [blame] | 2179 | data.cur_pct = 0; |
Paul Lawrence | a96d9c9 | 2014-06-04 14:05:01 -0700 | [diff] [blame] | 2180 | data.time_started = time(NULL); |
| 2181 | data.remaining_time = -1; |
Paul Lawrence | ae59fe6 | 2014-01-21 08:23:27 -0800 | [diff] [blame] | 2182 | |
| 2183 | rc = encrypt_groups(&data); |
| 2184 | if (rc) { |
| 2185 | SLOGE("Error encrypting groups"); |
| 2186 | goto errout; |
| 2187 | } |
| 2188 | |
Paul Lawrence | 8799917 | 2014-02-20 12:21:31 -0800 | [diff] [blame] | 2189 | *size_already_done += data.completed ? size : data.last_written_sector; |
Paul Lawrence | ae59fe6 | 2014-01-21 08:23:27 -0800 | [diff] [blame] | 2190 | rc = 0; |
| 2191 | |
| 2192 | errout: |
| 2193 | close(data.realfd); |
| 2194 | close(data.cryptofd); |
| 2195 | |
| 2196 | return rc; |
| 2197 | } |
| 2198 | |
| 2199 | static int cryptfs_enable_inplace_full(char *crypto_blkdev, char *real_blkdev, |
| 2200 | off64_t size, off64_t *size_already_done, |
Paul Lawrence | 8799917 | 2014-02-20 12:21:31 -0800 | [diff] [blame] | 2201 | off64_t tot_size, |
| 2202 | off64_t previously_encrypted_upto) |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 2203 | { |
| 2204 | int realfd, cryptofd; |
| 2205 | char *buf[CRYPT_INPLACE_BUFSIZE]; |
| 2206 | int rc = -1; |
| 2207 | off64_t numblocks, i, remainder; |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 2208 | off64_t one_pct, cur_pct, new_pct; |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 2209 | off64_t blocks_already_done, tot_numblocks; |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 2210 | |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 2211 | if ( (realfd = open(real_blkdev, O_RDONLY)) < 0) { |
| 2212 | SLOGE("Error opening real_blkdev %s for inplace encrypt\n", real_blkdev); |
| 2213 | return -1; |
| 2214 | } |
| 2215 | |
| 2216 | if ( (cryptofd = open(crypto_blkdev, O_WRONLY)) < 0) { |
| 2217 | SLOGE("Error opening crypto_blkdev %s for inplace encrypt\n", crypto_blkdev); |
| 2218 | close(realfd); |
| 2219 | return -1; |
| 2220 | } |
| 2221 | |
| 2222 | /* This is pretty much a simple loop of reading 4K, and writing 4K. |
| 2223 | * The size passed in is the number of 512 byte sectors in the filesystem. |
| 2224 | * So compute the number of whole 4K blocks we should read/write, |
| 2225 | * and the remainder. |
| 2226 | */ |
| 2227 | numblocks = size / CRYPT_SECTORS_PER_BUFSIZE; |
| 2228 | remainder = size % CRYPT_SECTORS_PER_BUFSIZE; |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 2229 | tot_numblocks = tot_size / CRYPT_SECTORS_PER_BUFSIZE; |
| 2230 | blocks_already_done = *size_already_done / CRYPT_SECTORS_PER_BUFSIZE; |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 2231 | |
| 2232 | SLOGE("Encrypting filesystem in place..."); |
| 2233 | |
Paul Lawrence | 8799917 | 2014-02-20 12:21:31 -0800 | [diff] [blame] | 2234 | i = previously_encrypted_upto + 1 - *size_already_done; |
| 2235 | |
| 2236 | if (lseek64(realfd, i * CRYPT_SECTOR_SIZE, SEEK_SET) < 0) { |
| 2237 | SLOGE("Cannot seek to previously encrypted point on %s", real_blkdev); |
| 2238 | goto errout; |
| 2239 | } |
| 2240 | |
| 2241 | if (lseek64(cryptofd, i * CRYPT_SECTOR_SIZE, SEEK_SET) < 0) { |
| 2242 | SLOGE("Cannot seek to previously encrypted point on %s", crypto_blkdev); |
| 2243 | goto errout; |
| 2244 | } |
| 2245 | |
| 2246 | for (;i < size && i % CRYPT_SECTORS_PER_BUFSIZE != 0; ++i) { |
| 2247 | if (unix_read(realfd, buf, CRYPT_SECTOR_SIZE) <= 0) { |
| 2248 | SLOGE("Error reading initial sectors from real_blkdev %s for " |
| 2249 | "inplace encrypt\n", crypto_blkdev); |
| 2250 | goto errout; |
| 2251 | } |
| 2252 | if (unix_write(cryptofd, buf, CRYPT_SECTOR_SIZE) <= 0) { |
| 2253 | SLOGE("Error writing initial sectors to crypto_blkdev %s for " |
| 2254 | "inplace encrypt\n", crypto_blkdev); |
| 2255 | goto errout; |
| 2256 | } else { |
Elliott Hughes | cb33f57 | 2014-06-25 18:25:11 -0700 | [diff] [blame] | 2257 | SLOGI("Encrypted 1 block at %" PRId64, i); |
Paul Lawrence | 8799917 | 2014-02-20 12:21:31 -0800 | [diff] [blame] | 2258 | } |
| 2259 | } |
| 2260 | |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 2261 | one_pct = tot_numblocks / 100; |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 2262 | cur_pct = 0; |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 2263 | /* process the majority of the filesystem in blocks */ |
Paul Lawrence | 8799917 | 2014-02-20 12:21:31 -0800 | [diff] [blame] | 2264 | for (i/=CRYPT_SECTORS_PER_BUFSIZE; i<numblocks; i++) { |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 2265 | new_pct = (i + blocks_already_done) / one_pct; |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 2266 | if (new_pct > cur_pct) { |
| 2267 | char buf[8]; |
| 2268 | |
| 2269 | cur_pct = new_pct; |
Elliott Hughes | 7373716 | 2014-06-25 17:27:42 -0700 | [diff] [blame] | 2270 | snprintf(buf, sizeof(buf), "%" PRId64, cur_pct); |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 2271 | property_set("vold.encrypt_progress", buf); |
| 2272 | } |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 2273 | if (unix_read(realfd, buf, CRYPT_INPLACE_BUFSIZE) <= 0) { |
Paul Lawrence | 8799917 | 2014-02-20 12:21:31 -0800 | [diff] [blame] | 2274 | SLOGE("Error reading real_blkdev %s for inplace encrypt", crypto_blkdev); |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 2275 | goto errout; |
| 2276 | } |
| 2277 | if (unix_write(cryptofd, buf, CRYPT_INPLACE_BUFSIZE) <= 0) { |
Paul Lawrence | 8799917 | 2014-02-20 12:21:31 -0800 | [diff] [blame] | 2278 | SLOGE("Error writing crypto_blkdev %s for inplace encrypt", crypto_blkdev); |
| 2279 | goto errout; |
| 2280 | } else { |
Elliott Hughes | cb33f57 | 2014-06-25 18:25:11 -0700 | [diff] [blame] | 2281 | SLOGD("Encrypted %d block at %" PRId64, |
Paul Lawrence | 8799917 | 2014-02-20 12:21:31 -0800 | [diff] [blame] | 2282 | CRYPT_SECTORS_PER_BUFSIZE, |
| 2283 | i * CRYPT_SECTORS_PER_BUFSIZE); |
| 2284 | } |
| 2285 | |
Paul Lawrence | 73d7a02 | 2014-06-09 14:10:09 -0700 | [diff] [blame] | 2286 | if (!is_battery_ok_to_continue()) { |
Paul Lawrence | 8799917 | 2014-02-20 12:21:31 -0800 | [diff] [blame] | 2287 | SLOGE("Stopping encryption due to low battery"); |
| 2288 | *size_already_done += (i + 1) * CRYPT_SECTORS_PER_BUFSIZE - 1; |
| 2289 | rc = 0; |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 2290 | goto errout; |
| 2291 | } |
| 2292 | } |
| 2293 | |
| 2294 | /* Do any remaining sectors */ |
| 2295 | for (i=0; i<remainder; i++) { |
Paul Lawrence | 8799917 | 2014-02-20 12:21:31 -0800 | [diff] [blame] | 2296 | if (unix_read(realfd, buf, CRYPT_SECTOR_SIZE) <= 0) { |
| 2297 | SLOGE("Error reading final sectors from real_blkdev %s for inplace encrypt", crypto_blkdev); |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 2298 | goto errout; |
| 2299 | } |
Paul Lawrence | 8799917 | 2014-02-20 12:21:31 -0800 | [diff] [blame] | 2300 | if (unix_write(cryptofd, buf, CRYPT_SECTOR_SIZE) <= 0) { |
| 2301 | SLOGE("Error writing final sectors to crypto_blkdev %s for inplace encrypt", crypto_blkdev); |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 2302 | goto errout; |
Paul Lawrence | 8799917 | 2014-02-20 12:21:31 -0800 | [diff] [blame] | 2303 | } else { |
| 2304 | SLOGI("Encrypted 1 block at next location"); |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 2305 | } |
| 2306 | } |
| 2307 | |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 2308 | *size_already_done += size; |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 2309 | rc = 0; |
| 2310 | |
| 2311 | errout: |
| 2312 | close(realfd); |
| 2313 | close(cryptofd); |
| 2314 | |
| 2315 | return rc; |
| 2316 | } |
| 2317 | |
Paul Lawrence | ae59fe6 | 2014-01-21 08:23:27 -0800 | [diff] [blame] | 2318 | static int cryptfs_enable_inplace(char *crypto_blkdev, char *real_blkdev, |
| 2319 | off64_t size, off64_t *size_already_done, |
Paul Lawrence | 8799917 | 2014-02-20 12:21:31 -0800 | [diff] [blame] | 2320 | off64_t tot_size, |
| 2321 | off64_t previously_encrypted_upto) |
Paul Lawrence | ae59fe6 | 2014-01-21 08:23:27 -0800 | [diff] [blame] | 2322 | { |
Paul Lawrence | 8799917 | 2014-02-20 12:21:31 -0800 | [diff] [blame] | 2323 | if (previously_encrypted_upto) { |
Elliott Hughes | cb33f57 | 2014-06-25 18:25:11 -0700 | [diff] [blame] | 2324 | SLOGD("Continuing encryption from %" PRId64, previously_encrypted_upto); |
Paul Lawrence | 8799917 | 2014-02-20 12:21:31 -0800 | [diff] [blame] | 2325 | } |
| 2326 | |
| 2327 | if (*size_already_done + size < previously_encrypted_upto) { |
| 2328 | *size_already_done += size; |
| 2329 | return 0; |
| 2330 | } |
| 2331 | |
Paul Lawrence | ae59fe6 | 2014-01-21 08:23:27 -0800 | [diff] [blame] | 2332 | if (cryptfs_enable_inplace_ext4(crypto_blkdev, real_blkdev, |
Paul Lawrence | 8799917 | 2014-02-20 12:21:31 -0800 | [diff] [blame] | 2333 | size, size_already_done, |
| 2334 | tot_size, previously_encrypted_upto) == 0) { |
Paul Lawrence | ae59fe6 | 2014-01-21 08:23:27 -0800 | [diff] [blame] | 2335 | return 0; |
| 2336 | } |
| 2337 | |
| 2338 | return cryptfs_enable_inplace_full(crypto_blkdev, real_blkdev, |
Paul Lawrence | 8799917 | 2014-02-20 12:21:31 -0800 | [diff] [blame] | 2339 | size, size_already_done, tot_size, |
| 2340 | previously_encrypted_upto); |
Paul Lawrence | ae59fe6 | 2014-01-21 08:23:27 -0800 | [diff] [blame] | 2341 | } |
| 2342 | |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 2343 | #define CRYPTO_ENABLE_WIPE 1 |
| 2344 | #define CRYPTO_ENABLE_INPLACE 2 |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 2345 | |
| 2346 | #define FRAMEWORK_BOOT_WAIT 60 |
| 2347 | |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 2348 | static inline int should_encrypt(struct volume_info *volume) |
| 2349 | { |
Paul Lawrence | ae59fe6 | 2014-01-21 08:23:27 -0800 | [diff] [blame] | 2350 | return (volume->flags & (VOL_ENCRYPTABLE | VOL_NONREMOVABLE)) == |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 2351 | (VOL_ENCRYPTABLE | VOL_NONREMOVABLE); |
| 2352 | } |
| 2353 | |
Paul Lawrence | 8799917 | 2014-02-20 12:21:31 -0800 | [diff] [blame] | 2354 | static int cryptfs_SHA256_fileblock(const char* filename, __le8* buf) |
| 2355 | { |
| 2356 | int fd = open(filename, O_RDONLY); |
| 2357 | if (fd == -1) { |
| 2358 | SLOGE("Error opening file %s", filename); |
| 2359 | return -1; |
| 2360 | } |
| 2361 | |
| 2362 | char block[CRYPT_INPLACE_BUFSIZE]; |
| 2363 | memset(block, 0, sizeof(block)); |
| 2364 | if (unix_read(fd, block, sizeof(block)) < 0) { |
| 2365 | SLOGE("Error reading file %s", filename); |
| 2366 | close(fd); |
| 2367 | return -1; |
| 2368 | } |
| 2369 | |
| 2370 | close(fd); |
| 2371 | |
| 2372 | SHA256_CTX c; |
| 2373 | SHA256_Init(&c); |
| 2374 | SHA256_Update(&c, block, sizeof(block)); |
| 2375 | SHA256_Final(buf, &c); |
| 2376 | |
| 2377 | return 0; |
| 2378 | } |
| 2379 | |
JP Abgrall | 62c7af3 | 2014-06-16 13:01:23 -0700 | [diff] [blame] | 2380 | static int get_fs_type(struct fstab_rec *rec) |
| 2381 | { |
| 2382 | if (!strcmp(rec->fs_type, "ext4")) { |
| 2383 | return EXT4_FS; |
| 2384 | } else if (!strcmp(rec->fs_type, "f2fs")) { |
| 2385 | return F2FS_FS; |
| 2386 | } else { |
| 2387 | return -1; |
| 2388 | } |
| 2389 | } |
| 2390 | |
Paul Lawrence | 8799917 | 2014-02-20 12:21:31 -0800 | [diff] [blame] | 2391 | static int cryptfs_enable_all_volumes(struct crypt_mnt_ftr *crypt_ftr, int how, |
| 2392 | char *crypto_blkdev, char *real_blkdev, |
| 2393 | int previously_encrypted_upto) |
| 2394 | { |
| 2395 | off64_t cur_encryption_done=0, tot_encryption_size=0; |
| 2396 | int i, rc = -1; |
| 2397 | |
Paul Lawrence | 73d7a02 | 2014-06-09 14:10:09 -0700 | [diff] [blame] | 2398 | if (!is_battery_ok_to_start()) { |
| 2399 | SLOGW("Not starting encryption due to low battery"); |
Paul Lawrence | 8799917 | 2014-02-20 12:21:31 -0800 | [diff] [blame] | 2400 | return 0; |
| 2401 | } |
| 2402 | |
| 2403 | /* The size of the userdata partition, and add in the vold volumes below */ |
| 2404 | tot_encryption_size = crypt_ftr->fs_size; |
| 2405 | |
| 2406 | if (how == CRYPTO_ENABLE_WIPE) { |
JP Abgrall | 62c7af3 | 2014-06-16 13:01:23 -0700 | [diff] [blame] | 2407 | struct fstab_rec* rec = fs_mgr_get_entry_for_mount_point(fstab, DATA_MNT_POINT); |
| 2408 | int fs_type = get_fs_type(rec); |
| 2409 | if (fs_type < 0) { |
| 2410 | SLOGE("cryptfs_enable: unsupported fs type %s\n", rec->fs_type); |
| 2411 | return -1; |
| 2412 | } |
| 2413 | rc = cryptfs_enable_wipe(crypto_blkdev, crypt_ftr->fs_size, fs_type); |
Paul Lawrence | 8799917 | 2014-02-20 12:21:31 -0800 | [diff] [blame] | 2414 | } else if (how == CRYPTO_ENABLE_INPLACE) { |
| 2415 | rc = cryptfs_enable_inplace(crypto_blkdev, real_blkdev, |
| 2416 | crypt_ftr->fs_size, &cur_encryption_done, |
| 2417 | tot_encryption_size, |
| 2418 | previously_encrypted_upto); |
| 2419 | |
Paul Lawrence | 73d7a02 | 2014-06-09 14:10:09 -0700 | [diff] [blame] | 2420 | if (!rc) { |
Paul Lawrence | 8799917 | 2014-02-20 12:21:31 -0800 | [diff] [blame] | 2421 | crypt_ftr->encrypted_upto = cur_encryption_done; |
| 2422 | } |
| 2423 | |
Paul Lawrence | 73d7a02 | 2014-06-09 14:10:09 -0700 | [diff] [blame] | 2424 | if (!rc && crypt_ftr->encrypted_upto == crypt_ftr->fs_size) { |
Paul Lawrence | 8799917 | 2014-02-20 12:21:31 -0800 | [diff] [blame] | 2425 | /* The inplace routine never actually sets the progress to 100% due |
| 2426 | * to the round down nature of integer division, so set it here */ |
| 2427 | property_set("vold.encrypt_progress", "100"); |
| 2428 | } |
| 2429 | } else { |
| 2430 | /* Shouldn't happen */ |
| 2431 | SLOGE("cryptfs_enable: internal error, unknown option\n"); |
| 2432 | rc = -1; |
| 2433 | } |
| 2434 | |
| 2435 | return rc; |
| 2436 | } |
| 2437 | |
Paul Lawrence | 1348603 | 2014-02-03 13:28:11 -0800 | [diff] [blame] | 2438 | int cryptfs_enable_internal(char *howarg, int crypt_type, char *passwd, |
| 2439 | int allow_reboot) |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 2440 | { |
| 2441 | int how = 0; |
Paul Lawrence | 8799917 | 2014-02-20 12:21:31 -0800 | [diff] [blame] | 2442 | char crypto_blkdev[MAXPATHLEN], real_blkdev[MAXPATHLEN]; |
Ken Sumrall | e5032c4 | 2012-04-01 23:58:44 -0700 | [diff] [blame] | 2443 | unsigned long nr_sec; |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 2444 | unsigned char decrypted_master_key[KEY_LEN_BYTES]; |
Ken Sumrall | 319b104 | 2011-06-14 14:01:55 -0700 | [diff] [blame] | 2445 | int rc=-1, fd, i, ret; |
Paul Lawrence | 8799917 | 2014-02-20 12:21:31 -0800 | [diff] [blame] | 2446 | struct crypt_mnt_ftr crypt_ftr; |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 2447 | struct crypt_persist_data *pdata; |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 2448 | char encrypted_state[PROPERTY_VALUE_MAX]; |
Ken Sumrall | 5d4c68e | 2011-01-30 19:06:03 -0800 | [diff] [blame] | 2449 | char lockid[32] = { 0 }; |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 2450 | char key_loc[PROPERTY_VALUE_MAX]; |
| 2451 | char fuse_sdcard[PROPERTY_VALUE_MAX]; |
| 2452 | char *sd_mnt_point; |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 2453 | int num_vols; |
| 2454 | struct volume_info *vol_list = 0; |
Paul Lawrence | 8799917 | 2014-02-20 12:21:31 -0800 | [diff] [blame] | 2455 | off64_t previously_encrypted_upto = 0; |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 2456 | |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 2457 | if (!strcmp(howarg, "wipe")) { |
| 2458 | how = CRYPTO_ENABLE_WIPE; |
| 2459 | } else if (! strcmp(howarg, "inplace")) { |
| 2460 | how = CRYPTO_ENABLE_INPLACE; |
| 2461 | } else { |
| 2462 | /* Shouldn't happen, as CommandListener vets the args */ |
Ken Sumrall | 3ed8236 | 2011-01-28 23:31:16 -0800 | [diff] [blame] | 2463 | goto error_unencrypted; |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 2464 | } |
| 2465 | |
Paul Lawrence | 8799917 | 2014-02-20 12:21:31 -0800 | [diff] [blame] | 2466 | /* See if an encryption was underway and interrupted */ |
| 2467 | if (how == CRYPTO_ENABLE_INPLACE |
| 2468 | && get_crypt_ftr_and_key(&crypt_ftr) == 0 |
| 2469 | && (crypt_ftr.flags & CRYPT_ENCRYPTION_IN_PROGRESS)) { |
| 2470 | previously_encrypted_upto = crypt_ftr.encrypted_upto; |
| 2471 | crypt_ftr.encrypted_upto = 0; |
Paul Lawrence | 6bfed20 | 2014-07-28 12:47:22 -0700 | [diff] [blame] | 2472 | crypt_ftr.flags &= ~CRYPT_ENCRYPTION_IN_PROGRESS; |
| 2473 | |
| 2474 | /* At this point, we are in an inconsistent state. Until we successfully |
| 2475 | complete encryption, a reboot will leave us broken. So mark the |
| 2476 | encryption failed in case that happens. |
| 2477 | On successfully completing encryption, remove this flag */ |
| 2478 | crypt_ftr.flags |= CRYPT_INCONSISTENT_STATE; |
| 2479 | |
| 2480 | put_crypt_ftr_and_key(&crypt_ftr); |
Paul Lawrence | 8799917 | 2014-02-20 12:21:31 -0800 | [diff] [blame] | 2481 | } |
| 2482 | |
| 2483 | property_get("ro.crypto.state", encrypted_state, ""); |
| 2484 | if (!strcmp(encrypted_state, "encrypted") && !previously_encrypted_upto) { |
| 2485 | SLOGE("Device is already running encrypted, aborting"); |
| 2486 | goto error_unencrypted; |
| 2487 | } |
| 2488 | |
| 2489 | // TODO refactor fs_mgr_get_crypt_info to get both in one call |
| 2490 | fs_mgr_get_crypt_info(fstab, key_loc, 0, sizeof(key_loc)); |
Ken Sumrall | 56ad03c | 2013-02-13 13:00:19 -0800 | [diff] [blame] | 2491 | fs_mgr_get_crypt_info(fstab, 0, real_blkdev, sizeof(real_blkdev)); |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 2492 | |
Ken Sumrall | 3ed8236 | 2011-01-28 23:31:16 -0800 | [diff] [blame] | 2493 | /* Get the size of the real block device */ |
| 2494 | fd = open(real_blkdev, O_RDONLY); |
| 2495 | if ( (nr_sec = get_blkdev_size(fd)) == 0) { |
| 2496 | SLOGE("Cannot get size of block device %s\n", real_blkdev); |
| 2497 | goto error_unencrypted; |
| 2498 | } |
| 2499 | close(fd); |
| 2500 | |
| 2501 | /* If doing inplace encryption, make sure the orig fs doesn't include the crypto footer */ |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 2502 | if ((how == CRYPTO_ENABLE_INPLACE) && (!strcmp(key_loc, KEY_IN_FOOTER))) { |
Ken Sumrall | 3ed8236 | 2011-01-28 23:31:16 -0800 | [diff] [blame] | 2503 | unsigned int fs_size_sec, max_fs_size_sec; |
| 2504 | |
| 2505 | fs_size_sec = get_fs_size(real_blkdev); |
Paul Lawrence | 8799917 | 2014-02-20 12:21:31 -0800 | [diff] [blame] | 2506 | max_fs_size_sec = nr_sec - (CRYPT_FOOTER_OFFSET / CRYPT_SECTOR_SIZE); |
Ken Sumrall | 3ed8236 | 2011-01-28 23:31:16 -0800 | [diff] [blame] | 2507 | |
| 2508 | if (fs_size_sec > max_fs_size_sec) { |
| 2509 | SLOGE("Orig filesystem overlaps crypto footer region. Cannot encrypt in place."); |
| 2510 | goto error_unencrypted; |
| 2511 | } |
| 2512 | } |
| 2513 | |
Ken Sumrall | 5d4c68e | 2011-01-30 19:06:03 -0800 | [diff] [blame] | 2514 | /* Get a wakelock as this may take a while, and we don't want the |
| 2515 | * device to sleep on us. We'll grab a partial wakelock, and if the UI |
| 2516 | * wants to keep the screen on, it can grab a full wakelock. |
| 2517 | */ |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 2518 | snprintf(lockid, sizeof(lockid), "enablecrypto%d", (int) getpid()); |
Ken Sumrall | 5d4c68e | 2011-01-30 19:06:03 -0800 | [diff] [blame] | 2519 | acquire_wake_lock(PARTIAL_WAKE_LOCK, lockid); |
| 2520 | |
Jeff Sharkey | 7382f81 | 2012-08-23 14:08:59 -0700 | [diff] [blame] | 2521 | /* Get the sdcard mount point */ |
Jeff Sharkey | b77bc46 | 2012-10-01 14:36:26 -0700 | [diff] [blame] | 2522 | sd_mnt_point = getenv("EMULATED_STORAGE_SOURCE"); |
Jeff Sharkey | 7382f81 | 2012-08-23 14:08:59 -0700 | [diff] [blame] | 2523 | if (!sd_mnt_point) { |
| 2524 | sd_mnt_point = getenv("EXTERNAL_STORAGE"); |
| 2525 | } |
| 2526 | if (!sd_mnt_point) { |
| 2527 | sd_mnt_point = "/mnt/sdcard"; |
| 2528 | } |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 2529 | |
Paul Lawrence | 8799917 | 2014-02-20 12:21:31 -0800 | [diff] [blame] | 2530 | /* TODO |
| 2531 | * Currently do not have test devices with multiple encryptable volumes. |
| 2532 | * When we acquire some, re-add support. |
| 2533 | */ |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 2534 | num_vols=vold_getNumDirectVolumes(); |
| 2535 | vol_list = malloc(sizeof(struct volume_info) * num_vols); |
| 2536 | vold_getDirectVolumeList(vol_list); |
| 2537 | |
| 2538 | for (i=0; i<num_vols; i++) { |
| 2539 | if (should_encrypt(&vol_list[i])) { |
Paul Lawrence | 8799917 | 2014-02-20 12:21:31 -0800 | [diff] [blame] | 2540 | SLOGE("Cannot encrypt if there are multiple encryptable volumes" |
| 2541 | "%s\n", vol_list[i].label); |
| 2542 | goto error_unencrypted; |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 2543 | } |
| 2544 | } |
| 2545 | |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 2546 | /* The init files are setup to stop the class main and late start when |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 2547 | * vold sets trigger_shutdown_framework. |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 2548 | */ |
| 2549 | property_set("vold.decrypt", "trigger_shutdown_framework"); |
| 2550 | SLOGD("Just asked init to shut down class main\n"); |
| 2551 | |
Ken Sumrall | 425524d | 2012-06-14 20:55:28 -0700 | [diff] [blame] | 2552 | if (vold_unmountAllAsecs()) { |
| 2553 | /* Just report the error. If any are left mounted, |
| 2554 | * umounting /data below will fail and handle the error. |
| 2555 | */ |
| 2556 | SLOGE("Error unmounting internal asecs"); |
| 2557 | } |
| 2558 | |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 2559 | property_get("ro.crypto.fuse_sdcard", fuse_sdcard, ""); |
| 2560 | if (!strcmp(fuse_sdcard, "true")) { |
| 2561 | /* This is a device using the fuse layer to emulate the sdcard semantics |
| 2562 | * on top of the userdata partition. vold does not manage it, it is managed |
| 2563 | * by the sdcard service. The sdcard service was killed by the property trigger |
| 2564 | * above, so just unmount it now. We must do this _AFTER_ killing the framework, |
| 2565 | * unlike the case for vold managed devices above. |
| 2566 | */ |
| 2567 | if (wait_and_unmount(sd_mnt_point)) { |
| 2568 | goto error_shutting_down; |
| 2569 | } |
Ken Sumrall | 2eaf713 | 2011-01-14 12:45:48 -0800 | [diff] [blame] | 2570 | } |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 2571 | |
| 2572 | /* Now unmount the /data partition. */ |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 2573 | if (wait_and_unmount(DATA_MNT_POINT)) { |
JP Abgrall | 502dc74 | 2013-11-01 13:06:20 -0700 | [diff] [blame] | 2574 | if (allow_reboot) { |
| 2575 | goto error_shutting_down; |
| 2576 | } else { |
| 2577 | goto error_unencrypted; |
| 2578 | } |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 2579 | } |
| 2580 | |
| 2581 | /* Do extra work for a better UX when doing the long inplace encryption */ |
| 2582 | if (how == CRYPTO_ENABLE_INPLACE) { |
| 2583 | /* Now that /data is unmounted, we need to mount a tmpfs |
| 2584 | * /data, set a property saying we're doing inplace encryption, |
| 2585 | * and restart the framework. |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 2586 | */ |
Ken Sumrall | e5032c4 | 2012-04-01 23:58:44 -0700 | [diff] [blame] | 2587 | if (fs_mgr_do_tmpfs_mount(DATA_MNT_POINT)) { |
Ken Sumrall | 3ed8236 | 2011-01-28 23:31:16 -0800 | [diff] [blame] | 2588 | goto error_shutting_down; |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 2589 | } |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 2590 | /* Tells the framework that inplace encryption is starting */ |
Ken Sumrall | 7df8412 | 2011-01-18 14:04:08 -0800 | [diff] [blame] | 2591 | property_set("vold.encrypt_progress", "0"); |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 2592 | |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 2593 | /* restart the framework. */ |
| 2594 | /* Create necessary paths on /data */ |
| 2595 | if (prep_data_fs()) { |
Ken Sumrall | 3ed8236 | 2011-01-28 23:31:16 -0800 | [diff] [blame] | 2596 | goto error_shutting_down; |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 2597 | } |
| 2598 | |
Ken Sumrall | 92736ef | 2012-10-17 20:57:14 -0700 | [diff] [blame] | 2599 | /* Ugh, shutting down the framework is not synchronous, so until it |
| 2600 | * can be fixed, this horrible hack will wait a moment for it all to |
| 2601 | * shut down before proceeding. Without it, some devices cannot |
| 2602 | * restart the graphics services. |
| 2603 | */ |
| 2604 | sleep(2); |
| 2605 | |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 2606 | /* startup service classes main and late_start */ |
| 2607 | property_set("vold.decrypt", "trigger_restart_min_framework"); |
| 2608 | SLOGD("Just triggered restart_min_framework\n"); |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 2609 | |
Ken Sumrall | 7df8412 | 2011-01-18 14:04:08 -0800 | [diff] [blame] | 2610 | /* OK, the framework is restarted and will soon be showing a |
| 2611 | * progress bar. Time to setup an encrypted mapping, and |
| 2612 | * either write a new filesystem, or encrypt in place updating |
| 2613 | * the progress bar as we work. |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 2614 | */ |
| 2615 | } |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 2616 | |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 2617 | /* Start the actual work of making an encrypted filesystem */ |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 2618 | /* Initialize a crypt_mnt_ftr for the partition */ |
Paul Lawrence | 8799917 | 2014-02-20 12:21:31 -0800 | [diff] [blame] | 2619 | if (previously_encrypted_upto == 0) { |
Paul Lawrence | 69f4ebd | 2014-04-14 12:17:14 -0700 | [diff] [blame] | 2620 | if (cryptfs_init_crypt_mnt_ftr(&crypt_ftr)) { |
| 2621 | goto error_shutting_down; |
| 2622 | } |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 2623 | |
Paul Lawrence | 8799917 | 2014-02-20 12:21:31 -0800 | [diff] [blame] | 2624 | if (!strcmp(key_loc, KEY_IN_FOOTER)) { |
| 2625 | crypt_ftr.fs_size = nr_sec |
| 2626 | - (CRYPT_FOOTER_OFFSET / CRYPT_SECTOR_SIZE); |
| 2627 | } else { |
| 2628 | crypt_ftr.fs_size = nr_sec; |
| 2629 | } |
Paul Lawrence | 6bfed20 | 2014-07-28 12:47:22 -0700 | [diff] [blame] | 2630 | /* At this point, we are in an inconsistent state. Until we successfully |
| 2631 | complete encryption, a reboot will leave us broken. So mark the |
| 2632 | encryption failed in case that happens. |
| 2633 | On successfully completing encryption, remove this flag */ |
| 2634 | crypt_ftr.flags |= CRYPT_INCONSISTENT_STATE; |
Paul Lawrence | 8799917 | 2014-02-20 12:21:31 -0800 | [diff] [blame] | 2635 | crypt_ftr.crypt_type = crypt_type; |
| 2636 | strcpy((char *)crypt_ftr.crypto_type_name, "aes-cbc-essiv:sha256"); |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 2637 | |
Paul Lawrence | 8799917 | 2014-02-20 12:21:31 -0800 | [diff] [blame] | 2638 | /* Make an encrypted master key */ |
| 2639 | if (create_encrypted_random_key(passwd, crypt_ftr.master_key, crypt_ftr.salt, &crypt_ftr)) { |
| 2640 | SLOGE("Cannot create encrypted master key\n"); |
| 2641 | goto error_shutting_down; |
| 2642 | } |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 2643 | |
Paul Lawrence | 8799917 | 2014-02-20 12:21:31 -0800 | [diff] [blame] | 2644 | /* Write the key to the end of the partition */ |
| 2645 | put_crypt_ftr_and_key(&crypt_ftr); |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 2646 | |
Paul Lawrence | 8799917 | 2014-02-20 12:21:31 -0800 | [diff] [blame] | 2647 | /* If any persistent data has been remembered, save it. |
| 2648 | * If none, create a valid empty table and save that. |
| 2649 | */ |
| 2650 | if (!persist_data) { |
| 2651 | pdata = malloc(CRYPT_PERSIST_DATA_SIZE); |
| 2652 | if (pdata) { |
| 2653 | init_empty_persist_data(pdata, CRYPT_PERSIST_DATA_SIZE); |
| 2654 | persist_data = pdata; |
| 2655 | } |
| 2656 | } |
| 2657 | if (persist_data) { |
| 2658 | save_persistent_data(); |
| 2659 | } |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 2660 | } |
| 2661 | |
Paul Lawrence | d0c7b17 | 2014-08-08 14:28:10 -0700 | [diff] [blame^] | 2662 | decrypt_master_key(passwd, decrypted_master_key, &crypt_ftr, 0, 0); |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 2663 | create_crypto_blk_dev(&crypt_ftr, decrypted_master_key, real_blkdev, crypto_blkdev, |
| 2664 | "userdata"); |
| 2665 | |
Paul Lawrence | 8799917 | 2014-02-20 12:21:31 -0800 | [diff] [blame] | 2666 | /* If we are continuing, check checksums match */ |
| 2667 | rc = 0; |
| 2668 | if (previously_encrypted_upto) { |
| 2669 | __le8 hash_first_block[SHA256_DIGEST_LENGTH]; |
| 2670 | rc = cryptfs_SHA256_fileblock(crypto_blkdev, hash_first_block); |
Ken Sumrall | 128626f | 2011-06-28 18:45:14 -0700 | [diff] [blame] | 2671 | |
Paul Lawrence | 8799917 | 2014-02-20 12:21:31 -0800 | [diff] [blame] | 2672 | if (!rc && memcmp(hash_first_block, crypt_ftr.hash_first_block, |
| 2673 | sizeof(hash_first_block)) != 0) { |
| 2674 | SLOGE("Checksums do not match - trigger wipe"); |
| 2675 | rc = -1; |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 2676 | } |
| 2677 | } |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 2678 | |
Paul Lawrence | 8799917 | 2014-02-20 12:21:31 -0800 | [diff] [blame] | 2679 | if (!rc) { |
| 2680 | rc = cryptfs_enable_all_volumes(&crypt_ftr, how, |
| 2681 | crypto_blkdev, real_blkdev, |
| 2682 | previously_encrypted_upto); |
| 2683 | } |
| 2684 | |
| 2685 | /* Calculate checksum if we are not finished */ |
Paul Lawrence | 73d7a02 | 2014-06-09 14:10:09 -0700 | [diff] [blame] | 2686 | if (!rc && crypt_ftr.encrypted_upto != crypt_ftr.fs_size) { |
Paul Lawrence | 8799917 | 2014-02-20 12:21:31 -0800 | [diff] [blame] | 2687 | rc = cryptfs_SHA256_fileblock(crypto_blkdev, |
| 2688 | crypt_ftr.hash_first_block); |
Paul Lawrence | 73d7a02 | 2014-06-09 14:10:09 -0700 | [diff] [blame] | 2689 | if (rc) { |
Paul Lawrence | 8799917 | 2014-02-20 12:21:31 -0800 | [diff] [blame] | 2690 | SLOGE("Error calculating checksum for continuing encryption"); |
| 2691 | rc = -1; |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 2692 | } |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 2693 | } |
| 2694 | |
| 2695 | /* Undo the dm-crypt mapping whether we succeed or not */ |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 2696 | delete_crypto_blk_dev("userdata"); |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 2697 | |
| 2698 | free(vol_list); |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 2699 | |
| 2700 | if (! rc) { |
| 2701 | /* Success */ |
Paul Lawrence | 6bfed20 | 2014-07-28 12:47:22 -0700 | [diff] [blame] | 2702 | crypt_ftr.flags &= ~CRYPT_INCONSISTENT_STATE; |
Ken Sumrall | 7f7dbaa | 2011-02-01 15:46:41 -0800 | [diff] [blame] | 2703 | |
Paul Lawrence | 6bfed20 | 2014-07-28 12:47:22 -0700 | [diff] [blame] | 2704 | if (crypt_ftr.encrypted_upto != crypt_ftr.fs_size) { |
Paul Lawrence | 8799917 | 2014-02-20 12:21:31 -0800 | [diff] [blame] | 2705 | SLOGD("Encrypted up to sector %lld - will continue after reboot", |
| 2706 | crypt_ftr.encrypted_upto); |
Paul Lawrence | 6bfed20 | 2014-07-28 12:47:22 -0700 | [diff] [blame] | 2707 | crypt_ftr.flags |= CRYPT_ENCRYPTION_IN_PROGRESS; |
Paul Lawrence | 8799917 | 2014-02-20 12:21:31 -0800 | [diff] [blame] | 2708 | } |
Paul Lawrence | 73d7a02 | 2014-06-09 14:10:09 -0700 | [diff] [blame] | 2709 | |
Paul Lawrence | 6bfed20 | 2014-07-28 12:47:22 -0700 | [diff] [blame] | 2710 | put_crypt_ftr_and_key(&crypt_ftr); |
Ken Sumrall | d33d417 | 2011-02-01 00:49:13 -0800 | [diff] [blame] | 2711 | |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 2712 | sleep(2); /* Give the UI a chance to show 100% progress */ |
Paul Lawrence | 8799917 | 2014-02-20 12:21:31 -0800 | [diff] [blame] | 2713 | /* Partially encrypted - ensure writes are flushed to ssd */ |
| 2714 | |
Paul Lawrence | 73d7a02 | 2014-06-09 14:10:09 -0700 | [diff] [blame] | 2715 | if (crypt_ftr.encrypted_upto == crypt_ftr.fs_size) { |
Paul Lawrence | 8799917 | 2014-02-20 12:21:31 -0800 | [diff] [blame] | 2716 | cryptfs_reboot(reboot); |
| 2717 | } else { |
| 2718 | cryptfs_reboot(shutdown); |
| 2719 | } |
Ken Sumrall | 3ed8236 | 2011-01-28 23:31:16 -0800 | [diff] [blame] | 2720 | } else { |
Mike Lockwood | ee6d8c4 | 2012-02-15 13:43:28 -0800 | [diff] [blame] | 2721 | char value[PROPERTY_VALUE_MAX]; |
| 2722 | |
Ken Sumrall | 319369a | 2012-06-27 16:30:18 -0700 | [diff] [blame] | 2723 | property_get("ro.vold.wipe_on_crypt_fail", value, "0"); |
Mike Lockwood | ee6d8c4 | 2012-02-15 13:43:28 -0800 | [diff] [blame] | 2724 | if (!strcmp(value, "1")) { |
| 2725 | /* wipe data if encryption failed */ |
| 2726 | SLOGE("encryption failed - rebooting into recovery to wipe data\n"); |
| 2727 | mkdir("/cache/recovery", 0700); |
Nick Kralevich | 4684e58 | 2012-06-26 15:07:03 -0700 | [diff] [blame] | 2728 | int fd = open("/cache/recovery/command", O_RDWR|O_CREAT|O_TRUNC, 0600); |
Mike Lockwood | ee6d8c4 | 2012-02-15 13:43:28 -0800 | [diff] [blame] | 2729 | if (fd >= 0) { |
| 2730 | write(fd, "--wipe_data", strlen("--wipe_data") + 1); |
| 2731 | close(fd); |
| 2732 | } else { |
| 2733 | SLOGE("could not open /cache/recovery/command\n"); |
| 2734 | } |
Paul Lawrence | 8799917 | 2014-02-20 12:21:31 -0800 | [diff] [blame] | 2735 | cryptfs_reboot(recovery); |
Mike Lockwood | ee6d8c4 | 2012-02-15 13:43:28 -0800 | [diff] [blame] | 2736 | } else { |
| 2737 | /* set property to trigger dialog */ |
| 2738 | property_set("vold.encrypt_progress", "error_partially_encrypted"); |
| 2739 | release_wake_lock(lockid); |
| 2740 | } |
Ken Sumrall | 3ed8236 | 2011-01-28 23:31:16 -0800 | [diff] [blame] | 2741 | return -1; |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 2742 | } |
| 2743 | |
Ken Sumrall | 3ed8236 | 2011-01-28 23:31:16 -0800 | [diff] [blame] | 2744 | /* hrm, the encrypt step claims success, but the reboot failed. |
| 2745 | * This should not happen. |
| 2746 | * Set the property and return. Hope the framework can deal with it. |
| 2747 | */ |
| 2748 | property_set("vold.encrypt_progress", "error_reboot_failed"); |
Ken Sumrall | 5d4c68e | 2011-01-30 19:06:03 -0800 | [diff] [blame] | 2749 | release_wake_lock(lockid); |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 2750 | return rc; |
Ken Sumrall | 3ed8236 | 2011-01-28 23:31:16 -0800 | [diff] [blame] | 2751 | |
| 2752 | error_unencrypted: |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 2753 | free(vol_list); |
Ken Sumrall | 3ed8236 | 2011-01-28 23:31:16 -0800 | [diff] [blame] | 2754 | property_set("vold.encrypt_progress", "error_not_encrypted"); |
Ken Sumrall | 5d4c68e | 2011-01-30 19:06:03 -0800 | [diff] [blame] | 2755 | if (lockid[0]) { |
| 2756 | release_wake_lock(lockid); |
| 2757 | } |
Ken Sumrall | 3ed8236 | 2011-01-28 23:31:16 -0800 | [diff] [blame] | 2758 | return -1; |
| 2759 | |
| 2760 | error_shutting_down: |
| 2761 | /* we failed, and have not encrypted anthing, so the users's data is still intact, |
| 2762 | * but the framework is stopped and not restarted to show the error, so it's up to |
| 2763 | * vold to restart the system. |
| 2764 | */ |
| 2765 | SLOGE("Error enabling encryption after framework is shutdown, no data changed, restarting system"); |
Paul Lawrence | 8799917 | 2014-02-20 12:21:31 -0800 | [diff] [blame] | 2766 | cryptfs_reboot(reboot); |
Ken Sumrall | 3ed8236 | 2011-01-28 23:31:16 -0800 | [diff] [blame] | 2767 | |
| 2768 | /* shouldn't get here */ |
| 2769 | property_set("vold.encrypt_progress", "error_shutting_down"); |
Ken Sumrall | 29d8da8 | 2011-05-18 17:20:07 -0700 | [diff] [blame] | 2770 | free(vol_list); |
Ken Sumrall | 5d4c68e | 2011-01-30 19:06:03 -0800 | [diff] [blame] | 2771 | if (lockid[0]) { |
| 2772 | release_wake_lock(lockid); |
| 2773 | } |
Ken Sumrall | 3ed8236 | 2011-01-28 23:31:16 -0800 | [diff] [blame] | 2774 | return -1; |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 2775 | } |
| 2776 | |
Paul Lawrence | 45f1053 | 2014-04-04 18:11:56 +0000 | [diff] [blame] | 2777 | int cryptfs_enable(char *howarg, int type, char *passwd, int allow_reboot) |
Paul Lawrence | 1348603 | 2014-02-03 13:28:11 -0800 | [diff] [blame] | 2778 | { |
Paul Lawrence | 45f1053 | 2014-04-04 18:11:56 +0000 | [diff] [blame] | 2779 | return cryptfs_enable_internal(howarg, type, passwd, allow_reboot); |
Paul Lawrence | 1348603 | 2014-02-03 13:28:11 -0800 | [diff] [blame] | 2780 | } |
| 2781 | |
| 2782 | int cryptfs_enable_default(char *howarg, int allow_reboot) |
| 2783 | { |
| 2784 | return cryptfs_enable_internal(howarg, CRYPT_TYPE_DEFAULT, |
| 2785 | DEFAULT_PASSWORD, allow_reboot); |
| 2786 | } |
| 2787 | |
| 2788 | int cryptfs_changepw(int crypt_type, const char *newpw) |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 2789 | { |
| 2790 | struct crypt_mnt_ftr crypt_ftr; |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 2791 | unsigned char decrypted_master_key[KEY_LEN_BYTES]; |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 2792 | |
| 2793 | /* This is only allowed after we've successfully decrypted the master key */ |
Paul Lawrence | f4faa57 | 2014-01-29 13:31:03 -0800 | [diff] [blame] | 2794 | if (!master_key_saved) { |
Ken Sumrall | 0cc1663 | 2011-01-18 20:32:26 -0800 | [diff] [blame] | 2795 | SLOGE("Key not saved, aborting"); |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 2796 | return -1; |
| 2797 | } |
| 2798 | |
Paul Lawrence | f4faa57 | 2014-01-29 13:31:03 -0800 | [diff] [blame] | 2799 | if (crypt_type < 0 || crypt_type > CRYPT_TYPE_MAX_TYPE) { |
| 2800 | SLOGE("Invalid crypt_type %d", crypt_type); |
| 2801 | return -1; |
| 2802 | } |
| 2803 | |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 2804 | /* get key */ |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 2805 | if (get_crypt_ftr_and_key(&crypt_ftr)) { |
Paul Lawrence | f4faa57 | 2014-01-29 13:31:03 -0800 | [diff] [blame] | 2806 | SLOGE("Error getting crypt footer and key"); |
| 2807 | return -1; |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 2808 | } |
| 2809 | |
Paul Lawrence | f4faa57 | 2014-01-29 13:31:03 -0800 | [diff] [blame] | 2810 | crypt_ftr.crypt_type = crypt_type; |
| 2811 | |
| 2812 | encrypt_master_key(crypt_type == CRYPT_TYPE_DEFAULT ? DEFAULT_PASSWORD |
| 2813 | : newpw, |
| 2814 | crypt_ftr.salt, |
| 2815 | saved_master_key, |
| 2816 | crypt_ftr.master_key, |
| 2817 | &crypt_ftr); |
Ken Sumrall | 8ddbe40 | 2011-01-17 15:26:29 -0800 | [diff] [blame] | 2818 | |
Jason parks | 70a4b3f | 2011-01-28 10:10:47 -0600 | [diff] [blame] | 2819 | /* save the key */ |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 2820 | put_crypt_ftr_and_key(&crypt_ftr); |
Ken Sumrall | 8f869aa | 2010-12-03 03:47:09 -0800 | [diff] [blame] | 2821 | |
| 2822 | return 0; |
| 2823 | } |
Ken Sumrall | 160b4d6 | 2013-04-22 12:15:39 -0700 | [diff] [blame] | 2824 | |
| 2825 | static int persist_get_key(char *fieldname, char *value) |
| 2826 | { |
| 2827 | unsigned int i; |
| 2828 | |
| 2829 | if (persist_data == NULL) { |
| 2830 | return -1; |
| 2831 | } |
| 2832 | for (i = 0; i < persist_data->persist_valid_entries; i++) { |
| 2833 | if (!strncmp(persist_data->persist_entry[i].key, fieldname, PROPERTY_KEY_MAX)) { |
| 2834 | /* We found it! */ |
| 2835 | strlcpy(value, persist_data->persist_entry[i].val, PROPERTY_VALUE_MAX); |
| 2836 | return 0; |
| 2837 | } |
| 2838 | } |
| 2839 | |
| 2840 | return -1; |
| 2841 | } |
| 2842 | |
| 2843 | static int persist_set_key(char *fieldname, char *value, int encrypted) |
| 2844 | { |
| 2845 | unsigned int i; |
| 2846 | unsigned int num; |
| 2847 | struct crypt_mnt_ftr crypt_ftr; |
| 2848 | unsigned int max_persistent_entries; |
| 2849 | unsigned int dsize; |
| 2850 | |
| 2851 | if (persist_data == NULL) { |
| 2852 | return -1; |
| 2853 | } |
| 2854 | |
| 2855 | /* If encrypted, use the values from the crypt_ftr, otherwise |
| 2856 | * use the values for the current spec. |
| 2857 | */ |
| 2858 | if (encrypted) { |
| 2859 | if(get_crypt_ftr_and_key(&crypt_ftr)) { |
| 2860 | return -1; |
| 2861 | } |
| 2862 | dsize = crypt_ftr.persist_data_size; |
| 2863 | } else { |
| 2864 | dsize = CRYPT_PERSIST_DATA_SIZE; |
| 2865 | } |
| 2866 | max_persistent_entries = (dsize - sizeof(struct crypt_persist_data)) / |
| 2867 | sizeof(struct crypt_persist_entry); |
| 2868 | |
| 2869 | num = persist_data->persist_valid_entries; |
| 2870 | |
| 2871 | for (i = 0; i < num; i++) { |
| 2872 | if (!strncmp(persist_data->persist_entry[i].key, fieldname, PROPERTY_KEY_MAX)) { |
| 2873 | /* We found an existing entry, update it! */ |
| 2874 | memset(persist_data->persist_entry[i].val, 0, PROPERTY_VALUE_MAX); |
| 2875 | strlcpy(persist_data->persist_entry[i].val, value, PROPERTY_VALUE_MAX); |
| 2876 | return 0; |
| 2877 | } |
| 2878 | } |
| 2879 | |
| 2880 | /* We didn't find it, add it to the end, if there is room */ |
| 2881 | if (persist_data->persist_valid_entries < max_persistent_entries) { |
| 2882 | memset(&persist_data->persist_entry[num], 0, sizeof(struct crypt_persist_entry)); |
| 2883 | strlcpy(persist_data->persist_entry[num].key, fieldname, PROPERTY_KEY_MAX); |
| 2884 | strlcpy(persist_data->persist_entry[num].val, value, PROPERTY_VALUE_MAX); |
| 2885 | persist_data->persist_valid_entries++; |
| 2886 | return 0; |
| 2887 | } |
| 2888 | |
| 2889 | return -1; |
| 2890 | } |
| 2891 | |
| 2892 | /* Return the value of the specified field. */ |
| 2893 | int cryptfs_getfield(char *fieldname, char *value, int len) |
| 2894 | { |
| 2895 | char temp_value[PROPERTY_VALUE_MAX]; |
| 2896 | char real_blkdev[MAXPATHLEN]; |
| 2897 | /* 0 is success, 1 is not encrypted, |
| 2898 | * -1 is value not set, -2 is any other error |
| 2899 | */ |
| 2900 | int rc = -2; |
| 2901 | |
| 2902 | if (persist_data == NULL) { |
| 2903 | load_persistent_data(); |
| 2904 | if (persist_data == NULL) { |
| 2905 | SLOGE("Getfield error, cannot load persistent data"); |
| 2906 | goto out; |
| 2907 | } |
| 2908 | } |
| 2909 | |
| 2910 | if (!persist_get_key(fieldname, temp_value)) { |
| 2911 | /* We found it, copy it to the caller's buffer and return */ |
| 2912 | strlcpy(value, temp_value, len); |
| 2913 | rc = 0; |
| 2914 | } else { |
| 2915 | /* Sadness, it's not there. Return the error */ |
| 2916 | rc = -1; |
| 2917 | } |
| 2918 | |
| 2919 | out: |
| 2920 | return rc; |
| 2921 | } |
| 2922 | |
| 2923 | /* Set the value of the specified field. */ |
| 2924 | int cryptfs_setfield(char *fieldname, char *value) |
| 2925 | { |
| 2926 | struct crypt_persist_data stored_pdata; |
| 2927 | struct crypt_persist_data *pdata_p; |
| 2928 | struct crypt_mnt_ftr crypt_ftr; |
| 2929 | char encrypted_state[PROPERTY_VALUE_MAX]; |
| 2930 | /* 0 is success, -1 is an error */ |
| 2931 | int rc = -1; |
| 2932 | int encrypted = 0; |
| 2933 | |
| 2934 | if (persist_data == NULL) { |
| 2935 | load_persistent_data(); |
| 2936 | if (persist_data == NULL) { |
| 2937 | SLOGE("Setfield error, cannot load persistent data"); |
| 2938 | goto out; |
| 2939 | } |
| 2940 | } |
| 2941 | |
| 2942 | property_get("ro.crypto.state", encrypted_state, ""); |
| 2943 | if (!strcmp(encrypted_state, "encrypted") ) { |
| 2944 | encrypted = 1; |
| 2945 | } |
| 2946 | |
| 2947 | if (persist_set_key(fieldname, value, encrypted)) { |
| 2948 | goto out; |
| 2949 | } |
| 2950 | |
| 2951 | /* If we are running encrypted, save the persistent data now */ |
| 2952 | if (encrypted) { |
| 2953 | if (save_persistent_data()) { |
| 2954 | SLOGE("Setfield error, cannot save persistent data"); |
| 2955 | goto out; |
| 2956 | } |
| 2957 | } |
| 2958 | |
| 2959 | rc = 0; |
| 2960 | |
| 2961 | out: |
| 2962 | return rc; |
| 2963 | } |
Paul Lawrence | f4faa57 | 2014-01-29 13:31:03 -0800 | [diff] [blame] | 2964 | |
| 2965 | /* Checks userdata. Attempt to mount the volume if default- |
| 2966 | * encrypted. |
| 2967 | * On success trigger next init phase and return 0. |
| 2968 | * Currently do not handle failure - see TODO below. |
| 2969 | */ |
| 2970 | int cryptfs_mount_default_encrypted(void) |
| 2971 | { |
| 2972 | char decrypt_state[PROPERTY_VALUE_MAX]; |
| 2973 | property_get("vold.decrypt", decrypt_state, "0"); |
| 2974 | if (!strcmp(decrypt_state, "0")) { |
| 2975 | SLOGE("Not encrypted - should not call here"); |
| 2976 | } else { |
| 2977 | int crypt_type = cryptfs_get_password_type(); |
| 2978 | if (crypt_type < 0 || crypt_type > CRYPT_TYPE_MAX_TYPE) { |
| 2979 | SLOGE("Bad crypt type - error"); |
| 2980 | } else if (crypt_type != CRYPT_TYPE_DEFAULT) { |
| 2981 | SLOGD("Password is not default - " |
| 2982 | "starting min framework to prompt"); |
| 2983 | property_set("vold.decrypt", "trigger_restart_min_framework"); |
| 2984 | return 0; |
| 2985 | } else if (cryptfs_check_passwd(DEFAULT_PASSWORD) == 0) { |
| 2986 | SLOGD("Password is default - restarting filesystem"); |
| 2987 | cryptfs_restart_internal(0); |
| 2988 | return 0; |
| 2989 | } else { |
| 2990 | SLOGE("Encrypted, default crypt type but can't decrypt"); |
| 2991 | } |
| 2992 | } |
| 2993 | |
Paul Lawrence | 6bfed20 | 2014-07-28 12:47:22 -0700 | [diff] [blame] | 2994 | /** Corrupt. Allow us to boot into framework, which will detect bad |
| 2995 | crypto when it calls do_crypto_complete, then do a factory reset |
Paul Lawrence | f4faa57 | 2014-01-29 13:31:03 -0800 | [diff] [blame] | 2996 | */ |
Paul Lawrence | 6bfed20 | 2014-07-28 12:47:22 -0700 | [diff] [blame] | 2997 | property_set("vold.decrypt", "trigger_restart_min_framework"); |
Paul Lawrence | f4faa57 | 2014-01-29 13:31:03 -0800 | [diff] [blame] | 2998 | return 0; |
| 2999 | } |
| 3000 | |
| 3001 | /* Returns type of the password, default, pattern, pin or password. |
| 3002 | */ |
| 3003 | int cryptfs_get_password_type(void) |
| 3004 | { |
| 3005 | struct crypt_mnt_ftr crypt_ftr; |
| 3006 | |
| 3007 | if (get_crypt_ftr_and_key(&crypt_ftr)) { |
| 3008 | SLOGE("Error getting crypt footer and key\n"); |
| 3009 | return -1; |
| 3010 | } |
| 3011 | |
Paul Lawrence | 6bfed20 | 2014-07-28 12:47:22 -0700 | [diff] [blame] | 3012 | if (crypt_ftr.flags & CRYPT_INCONSISTENT_STATE) { |
| 3013 | return -1; |
| 3014 | } |
| 3015 | |
Paul Lawrence | f4faa57 | 2014-01-29 13:31:03 -0800 | [diff] [blame] | 3016 | return crypt_ftr.crypt_type; |
| 3017 | } |
Paul Lawrence | 684dbdf | 2014-02-07 12:07:22 -0800 | [diff] [blame] | 3018 | |
Paul Lawrence | 399317e | 2014-03-10 13:20:50 -0700 | [diff] [blame] | 3019 | char* cryptfs_get_password() |
Paul Lawrence | 684dbdf | 2014-02-07 12:07:22 -0800 | [diff] [blame] | 3020 | { |
Paul Lawrence | 399317e | 2014-03-10 13:20:50 -0700 | [diff] [blame] | 3021 | struct timespec now; |
| 3022 | clock_gettime(CLOCK_MONOTONIC, &now); |
| 3023 | if (now.tv_sec < password_expiry_time) { |
| 3024 | return password; |
| 3025 | } else { |
| 3026 | cryptfs_clear_password(); |
| 3027 | return 0; |
| 3028 | } |
| 3029 | } |
| 3030 | |
| 3031 | void cryptfs_clear_password() |
| 3032 | { |
| 3033 | if (password) { |
| 3034 | size_t len = strlen(password); |
| 3035 | memset(password, 0, len); |
| 3036 | free(password); |
| 3037 | password = 0; |
| 3038 | password_expiry_time = 0; |
| 3039 | } |
Paul Lawrence | 684dbdf | 2014-02-07 12:07:22 -0800 | [diff] [blame] | 3040 | } |