Ethan Yonker | 4eca40d | 2014-11-11 14:52:28 -0600 | [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> |
| 24 | #include <sys/wait.h> |
| 25 | #include <sys/stat.h> |
| 26 | #include <ctype.h> |
| 27 | #include <fcntl.h> |
| 28 | #include <inttypes.h> |
| 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> |
| 40 | #include <ext4.h> |
| 41 | #include <linux/kdev_t.h> |
| 42 | #include <fs_mgr.h> |
| 43 | #include <time.h> |
| 44 | #include "cryptfs.h" |
| 45 | #define LOG_TAG "Cryptfs" |
| 46 | #include "cutils/log.h" |
| 47 | #include "cutils/properties.h" |
| 48 | #include "cutils/android_reboot.h" |
| 49 | #include "hardware_legacy/power.h" |
| 50 | #include <logwrap/logwrap.h> |
| 51 | //#include "VolumeManager.h" |
| 52 | //#include "VoldUtil.h" |
| 53 | #include "crypto_scrypt.h" |
| 54 | #include "ext4_utils.h" |
| 55 | #include "f2fs_sparseblock.h" |
| 56 | //#include "CheckBattery.h" |
| 57 | //#include "Process.h" |
| 58 | |
| 59 | #include <hardware/keymaster.h> |
| 60 | |
| 61 | #define UNUSED __attribute__((unused)) |
| 62 | |
| 63 | #define UNUSED __attribute__((unused)) |
| 64 | |
| 65 | #define DM_CRYPT_BUF_SIZE 4096 |
| 66 | |
| 67 | #define HASH_COUNT 2000 |
| 68 | #define KEY_LEN_BYTES 16 |
| 69 | #define IV_LEN_BYTES 16 |
| 70 | |
| 71 | #define KEY_IN_FOOTER "footer" |
| 72 | |
| 73 | // "default_password" encoded into hex (d=0x64 etc) |
| 74 | #define DEFAULT_PASSWORD "64656661756c745f70617373776f7264" |
| 75 | |
| 76 | #define EXT4_FS 1 |
| 77 | #define F2FS_FS 2 |
| 78 | |
| 79 | #define TABLE_LOAD_RETRIES 10 |
| 80 | |
| 81 | #define RSA_KEY_SIZE 2048 |
| 82 | #define RSA_KEY_SIZE_BYTES (RSA_KEY_SIZE / 8) |
| 83 | #define RSA_EXPONENT 0x10001 |
| 84 | |
| 85 | #define RETRY_MOUNT_ATTEMPTS 10 |
| 86 | #define RETRY_MOUNT_DELAY_SECONDS 1 |
| 87 | |
| 88 | char *me = "cryptfs"; |
| 89 | |
| 90 | static unsigned char saved_master_key[KEY_LEN_BYTES]; |
| 91 | static char *saved_mount_point; |
| 92 | static int master_key_saved = 0; |
| 93 | static struct crypt_persist_data *persist_data = NULL; |
| 94 | |
| 95 | static int keymaster_init(keymaster_device_t **keymaster_dev) |
| 96 | { |
| 97 | int rc; |
| 98 | |
| 99 | const hw_module_t* mod; |
| 100 | rc = hw_get_module_by_class(KEYSTORE_HARDWARE_MODULE_ID, NULL, &mod); |
| 101 | if (rc) { |
| 102 | printf("could not find any keystore module\n"); |
| 103 | goto out; |
| 104 | } |
| 105 | |
| 106 | rc = keymaster_open(mod, keymaster_dev); |
| 107 | if (rc) { |
| 108 | printf("could not open keymaster device in %s (%s)\n", |
| 109 | KEYSTORE_HARDWARE_MODULE_ID, strerror(-rc)); |
| 110 | goto out; |
| 111 | } |
| 112 | |
| 113 | return 0; |
| 114 | |
| 115 | out: |
| 116 | *keymaster_dev = NULL; |
| 117 | return rc; |
| 118 | } |
| 119 | |
| 120 | /* Should we use keymaster? */ |
| 121 | static int keymaster_check_compatibility() |
| 122 | { |
| 123 | keymaster_device_t *keymaster_dev = 0; |
| 124 | int rc = 0; |
| 125 | |
| 126 | if (keymaster_init(&keymaster_dev)) { |
| 127 | printf("Failed to init keymaster\n"); |
| 128 | rc = -1; |
| 129 | goto out; |
| 130 | } |
| 131 | |
| 132 | printf("keymaster version is %d\n", keymaster_dev->common.module->module_api_version); |
| 133 | |
| 134 | if (keymaster_dev->common.module->module_api_version |
| 135 | < KEYMASTER_MODULE_API_VERSION_0_3) { |
| 136 | rc = 0; |
| 137 | goto out; |
| 138 | } |
| 139 | |
| 140 | if (keymaster_dev->flags & KEYMASTER_BLOBS_ARE_STANDALONE) { |
| 141 | rc = 1; |
| 142 | } |
| 143 | |
| 144 | out: |
| 145 | keymaster_close(keymaster_dev); |
| 146 | return rc; |
| 147 | } |
| 148 | |
| 149 | /* Create a new keymaster key and store it in this footer */ |
| 150 | static int keymaster_create_key(struct crypt_mnt_ftr *ftr) |
| 151 | { |
| 152 | uint8_t* key = 0; |
| 153 | keymaster_device_t *keymaster_dev = 0; |
| 154 | |
| 155 | if (keymaster_init(&keymaster_dev)) { |
| 156 | printf("Failed to init keymaster\n"); |
| 157 | return -1; |
| 158 | } |
| 159 | |
| 160 | int rc = 0; |
| 161 | |
| 162 | keymaster_rsa_keygen_params_t params; |
| 163 | memset(¶ms, '\0', sizeof(params)); |
| 164 | params.public_exponent = RSA_EXPONENT; |
| 165 | params.modulus_size = RSA_KEY_SIZE; |
| 166 | |
| 167 | size_t key_size; |
| 168 | if (keymaster_dev->generate_keypair(keymaster_dev, TYPE_RSA, ¶ms, |
| 169 | &key, &key_size)) { |
| 170 | printf("Failed to generate keypair\n"); |
| 171 | rc = -1; |
| 172 | goto out; |
| 173 | } |
| 174 | |
| 175 | if (key_size > KEYMASTER_BLOB_SIZE) { |
| 176 | printf("Keymaster key too large for crypto footer\n"); |
| 177 | rc = -1; |
| 178 | goto out; |
| 179 | } |
| 180 | |
| 181 | memcpy(ftr->keymaster_blob, key, key_size); |
| 182 | ftr->keymaster_blob_size = key_size; |
| 183 | |
| 184 | out: |
| 185 | keymaster_close(keymaster_dev); |
| 186 | free(key); |
| 187 | return rc; |
| 188 | } |
| 189 | |
| 190 | /* This signs the given object using the keymaster key. */ |
| 191 | static int keymaster_sign_object(struct crypt_mnt_ftr *ftr, |
| 192 | const unsigned char *object, |
| 193 | const size_t object_size, |
| 194 | unsigned char **signature, |
| 195 | size_t *signature_size) |
| 196 | { |
| 197 | int rc = 0; |
| 198 | keymaster_device_t *keymaster_dev = 0; |
| 199 | if (keymaster_init(&keymaster_dev)) { |
| 200 | printf("Failed to init keymaster\n"); |
| 201 | return -1; |
| 202 | } |
| 203 | |
| 204 | /* We currently set the digest type to DIGEST_NONE because it's the |
| 205 | * only supported value for keymaster. A similar issue exists with |
| 206 | * PADDING_NONE. Long term both of these should likely change. |
| 207 | */ |
| 208 | keymaster_rsa_sign_params_t params; |
| 209 | params.digest_type = DIGEST_NONE; |
| 210 | params.padding_type = PADDING_NONE; |
| 211 | |
| 212 | unsigned char to_sign[RSA_KEY_SIZE_BYTES]; |
| 213 | size_t to_sign_size = sizeof(to_sign); |
| 214 | memset(to_sign, 0, RSA_KEY_SIZE_BYTES); |
| 215 | |
| 216 | // To sign a message with RSA, the message must satisfy two |
| 217 | // constraints: |
| 218 | // |
| 219 | // 1. The message, when interpreted as a big-endian numeric value, must |
| 220 | // be strictly less than the public modulus of the RSA key. Note |
| 221 | // that because the most significant bit of the public modulus is |
| 222 | // guaranteed to be 1 (else it's an (n-1)-bit key, not an n-bit |
| 223 | // key), an n-bit message with most significant bit 0 always |
| 224 | // satisfies this requirement. |
| 225 | // |
| 226 | // 2. The message must have the same length in bits as the public |
| 227 | // modulus of the RSA key. This requirement isn't mathematically |
| 228 | // necessary, but is necessary to ensure consistency in |
| 229 | // implementations. |
| 230 | switch (ftr->kdf_type) { |
| 231 | case KDF_SCRYPT_KEYMASTER_UNPADDED: |
| 232 | // This is broken: It produces a message which is shorter than |
| 233 | // the public modulus, failing criterion 2. |
| 234 | memcpy(to_sign, object, object_size); |
| 235 | to_sign_size = object_size; |
| 236 | printf("Signing unpadded object\n"); |
| 237 | break; |
| 238 | case KDF_SCRYPT_KEYMASTER_BADLY_PADDED: |
| 239 | // This is broken: Since the value of object is uniformly |
| 240 | // distributed, it produces a message that is larger than the |
| 241 | // public modulus with probability 0.25. |
| 242 | memcpy(to_sign, object, min(RSA_KEY_SIZE_BYTES, object_size)); |
| 243 | printf("Signing end-padded object\n"); |
| 244 | break; |
| 245 | case KDF_SCRYPT_KEYMASTER: |
| 246 | // This ensures the most significant byte of the signed message |
| 247 | // is zero. We could have zero-padded to the left instead, but |
| 248 | // this approach is slightly more robust against changes in |
| 249 | // object size. However, it's still broken (but not unusably |
| 250 | // so) because we really should be using a proper RSA padding |
| 251 | // function, such as OAEP. |
| 252 | // |
| 253 | // TODO(paullawrence): When keymaster 0.4 is available, change |
| 254 | // this to use the padding options it provides. |
| 255 | memcpy(to_sign + 1, object, min(RSA_KEY_SIZE_BYTES - 1, object_size)); |
| 256 | printf("Signing safely-padded object\n"); |
| 257 | break; |
| 258 | default: |
| 259 | printf("Unknown KDF type %d\n", ftr->kdf_type); |
| 260 | return -1; |
| 261 | } |
| 262 | |
| 263 | rc = keymaster_dev->sign_data(keymaster_dev, |
| 264 | ¶ms, |
| 265 | ftr->keymaster_blob, |
| 266 | ftr->keymaster_blob_size, |
| 267 | to_sign, |
| 268 | to_sign_size, |
| 269 | signature, |
| 270 | signature_size); |
| 271 | |
| 272 | keymaster_close(keymaster_dev); |
| 273 | return rc; |
| 274 | } |
| 275 | |
| 276 | /* Store password when userdata is successfully decrypted and mounted. |
| 277 | * Cleared by cryptfs_clear_password |
| 278 | * |
| 279 | * To avoid a double prompt at boot, we need to store the CryptKeeper |
| 280 | * password and pass it to KeyGuard, which uses it to unlock KeyStore. |
| 281 | * Since the entire framework is torn down and rebuilt after encryption, |
| 282 | * we have to use a daemon or similar to store the password. Since vold |
| 283 | * is secured against IPC except from system processes, it seems a reasonable |
| 284 | * place to store this. |
| 285 | * |
| 286 | * password should be cleared once it has been used. |
| 287 | * |
| 288 | * password is aged out after password_max_age_seconds seconds. |
| 289 | */ |
| 290 | static char* password = 0; |
| 291 | static int password_expiry_time = 0; |
| 292 | static const int password_max_age_seconds = 60; |
| 293 | |
| 294 | struct fstab *fstab; |
| 295 | |
| 296 | enum RebootType {reboot, recovery, shutdown}; |
| 297 | static void cryptfs_reboot(enum RebootType rt) |
| 298 | { |
| 299 | switch(rt) { |
| 300 | case reboot: |
| 301 | property_set(ANDROID_RB_PROPERTY, "reboot"); |
| 302 | break; |
| 303 | |
| 304 | case recovery: |
| 305 | property_set(ANDROID_RB_PROPERTY, "reboot,recovery"); |
| 306 | break; |
| 307 | |
| 308 | case shutdown: |
| 309 | property_set(ANDROID_RB_PROPERTY, "shutdown"); |
| 310 | break; |
| 311 | } |
| 312 | |
| 313 | sleep(20); |
| 314 | |
| 315 | /* Shouldn't get here, reboot should happen before sleep times out */ |
| 316 | return; |
| 317 | } |
| 318 | |
| 319 | static void ioctl_init(struct dm_ioctl *io, size_t dataSize, const char *name, unsigned flags) |
| 320 | { |
| 321 | memset(io, 0, dataSize); |
| 322 | io->data_size = dataSize; |
| 323 | io->data_start = sizeof(struct dm_ioctl); |
| 324 | io->version[0] = 4; |
| 325 | io->version[1] = 0; |
| 326 | io->version[2] = 0; |
| 327 | io->flags = flags; |
| 328 | if (name) { |
| 329 | strncpy(io->name, name, sizeof(io->name)); |
| 330 | } |
| 331 | } |
| 332 | |
| 333 | /** |
| 334 | * Gets the default device scrypt parameters for key derivation time tuning. |
| 335 | * The parameters should lead to about one second derivation time for the |
| 336 | * given device. |
| 337 | */ |
| 338 | static void get_device_scrypt_params(struct crypt_mnt_ftr *ftr) { |
| 339 | const int default_params[] = SCRYPT_DEFAULTS; |
| 340 | int params[] = SCRYPT_DEFAULTS; |
| 341 | char paramstr[PROPERTY_VALUE_MAX]; |
| 342 | char *token; |
| 343 | char *saveptr; |
| 344 | int i; |
| 345 | |
| 346 | property_get(SCRYPT_PROP, paramstr, ""); |
| 347 | if (paramstr[0] != '\0') { |
| 348 | /* |
| 349 | * The token we're looking for should be three integers separated by |
| 350 | * colons (e.g., "12:8:1"). Scan the property to make sure it matches. |
| 351 | */ |
| 352 | for (i = 0, token = strtok_r(paramstr, ":", &saveptr); |
| 353 | token != NULL && i < 3; |
| 354 | i++, token = strtok_r(NULL, ":", &saveptr)) { |
| 355 | char *endptr; |
| 356 | params[i] = strtol(token, &endptr, 10); |
| 357 | |
| 358 | /* |
| 359 | * Check that there was a valid number and it's 8-bit. If not, |
| 360 | * break out and the end check will take the default values. |
| 361 | */ |
| 362 | if ((*token == '\0') || (*endptr != '\0') || params[i] < 0 || params[i] > 255) { |
| 363 | break; |
| 364 | } |
| 365 | } |
| 366 | |
| 367 | /* |
| 368 | * If there were not enough tokens or a token was malformed (not an |
| 369 | * integer), it will end up here and the default parameters can be |
| 370 | * taken. |
| 371 | */ |
| 372 | if ((i != 3) || (token != NULL)) { |
| 373 | printf("bad scrypt parameters '%s' should be like '12:8:1'; using defaults", paramstr); |
| 374 | memcpy(params, default_params, sizeof(params)); |
| 375 | } |
| 376 | } |
| 377 | |
| 378 | ftr->N_factor = params[0]; |
| 379 | ftr->r_factor = params[1]; |
| 380 | ftr->p_factor = params[2]; |
| 381 | } |
| 382 | |
| 383 | static unsigned int get_fs_size(char *dev) |
| 384 | { |
| 385 | int fd, block_size; |
| 386 | struct ext4_super_block sb; |
| 387 | off64_t len; |
| 388 | |
| 389 | if ((fd = open(dev, O_RDONLY)) < 0) { |
| 390 | printf("Cannot open device to get filesystem size "); |
| 391 | return 0; |
| 392 | } |
| 393 | |
| 394 | if (lseek64(fd, 1024, SEEK_SET) < 0) { |
| 395 | printf("Cannot seek to superblock"); |
| 396 | return 0; |
| 397 | } |
| 398 | |
| 399 | if (read(fd, &sb, sizeof(sb)) != sizeof(sb)) { |
| 400 | printf("Cannot read superblock"); |
| 401 | return 0; |
| 402 | } |
| 403 | |
| 404 | close(fd); |
| 405 | |
| 406 | if (le32_to_cpu(sb.s_magic) != EXT4_SUPER_MAGIC) { |
| 407 | printf("Not a valid ext4 superblock"); |
| 408 | return 0; |
| 409 | } |
| 410 | block_size = 1024 << sb.s_log_block_size; |
| 411 | /* compute length in bytes */ |
| 412 | len = ( ((off64_t)sb.s_blocks_count_hi << 32) + sb.s_blocks_count_lo) * block_size; |
| 413 | |
| 414 | /* return length in sectors */ |
| 415 | return (unsigned int) (len / 512); |
| 416 | } |
| 417 | |
| 418 | static unsigned int get_blkdev_size(int fd) |
| 419 | { |
| 420 | unsigned int nr_sec; |
| 421 | |
| 422 | if ( (ioctl(fd, BLKGETSIZE, &nr_sec)) == -1) { |
| 423 | nr_sec = 0; |
| 424 | } |
| 425 | |
| 426 | return nr_sec; |
| 427 | } |
| 428 | |
| 429 | static int get_crypt_ftr_info(char **metadata_fname, off64_t *off) |
| 430 | { |
| 431 | static int cached_data = 0; |
| 432 | static off64_t cached_off = 0; |
| 433 | static char cached_metadata_fname[PROPERTY_VALUE_MAX] = ""; |
| 434 | int fd; |
| 435 | char key_loc[PROPERTY_VALUE_MAX]; |
| 436 | char real_blkdev[PROPERTY_VALUE_MAX]; |
| 437 | unsigned int nr_sec; |
| 438 | int rc = -1; |
| 439 | |
| 440 | if (!cached_data) { |
| 441 | fs_mgr_get_crypt_info(fstab, key_loc, real_blkdev, sizeof(key_loc)); |
| 442 | printf("get_crypt_ftr_info crypto key location: '%s'\n", key_loc); |
| 443 | if (!strcmp(key_loc, KEY_IN_FOOTER)) { |
| 444 | if ( (fd = open(real_blkdev, O_RDWR)) < 0) { |
| 445 | printf("Cannot open real block device %s\n", real_blkdev); |
| 446 | return -1; |
| 447 | } |
| 448 | |
| 449 | if ((nr_sec = get_blkdev_size(fd))) { |
| 450 | /* If it's an encrypted Android partition, the last 16 Kbytes contain the |
| 451 | * encryption info footer and key, and plenty of bytes to spare for future |
| 452 | * growth. |
| 453 | */ |
| 454 | strlcpy(cached_metadata_fname, real_blkdev, sizeof(cached_metadata_fname)); |
| 455 | cached_off = ((off64_t)nr_sec * 512) - CRYPT_FOOTER_OFFSET; |
| 456 | cached_data = 1; |
| 457 | } else { |
| 458 | printf("Cannot get size of block device %s\n", real_blkdev); |
| 459 | } |
| 460 | close(fd); |
| 461 | } else { |
| 462 | strlcpy(cached_metadata_fname, key_loc, sizeof(cached_metadata_fname)); |
| 463 | cached_off = 0; |
| 464 | cached_data = 1; |
| 465 | } |
| 466 | } |
| 467 | |
| 468 | if (cached_data) { |
| 469 | if (metadata_fname) { |
| 470 | *metadata_fname = cached_metadata_fname; |
| 471 | } |
| 472 | if (off) { |
| 473 | *off = cached_off; |
| 474 | } |
| 475 | rc = 0; |
| 476 | } |
| 477 | |
| 478 | return rc; |
| 479 | } |
| 480 | |
| 481 | /* key or salt can be NULL, in which case just skip writing that value. Useful to |
| 482 | * update the failed mount count but not change the key. |
| 483 | */ |
| 484 | static int put_crypt_ftr_and_key(struct crypt_mnt_ftr *crypt_ftr) |
| 485 | { |
| 486 | printf("TWRP NOT putting crypt footer and key\n"); |
| 487 | return 0; |
| 488 | int fd; |
| 489 | unsigned int nr_sec, cnt; |
| 490 | /* starting_off is set to the SEEK_SET offset |
| 491 | * where the crypto structure starts |
| 492 | */ |
| 493 | off64_t starting_off; |
| 494 | int rc = -1; |
| 495 | char *fname = NULL; |
| 496 | struct stat statbuf; |
| 497 | |
| 498 | if (get_crypt_ftr_info(&fname, &starting_off)) { |
| 499 | printf("Unable to get crypt_ftr_info\n"); |
| 500 | return -1; |
| 501 | } |
| 502 | if (fname[0] != '/') { |
| 503 | printf("Unexpected value for crypto key location\n"); |
| 504 | return -1; |
| 505 | } |
| 506 | if ( (fd = open(fname, O_RDWR | O_CREAT, 0600)) < 0) { |
| 507 | printf("Cannot open footer file %s for put\n", fname); |
| 508 | return -1; |
| 509 | } |
| 510 | |
| 511 | /* Seek to the start of the crypt footer */ |
| 512 | if (lseek64(fd, starting_off, SEEK_SET) == -1) { |
| 513 | printf("Cannot seek to real block device footer\n"); |
| 514 | goto errout; |
| 515 | } |
| 516 | |
| 517 | if ((cnt = write(fd, crypt_ftr, sizeof(struct crypt_mnt_ftr))) != sizeof(struct crypt_mnt_ftr)) { |
| 518 | printf("Cannot write real block device footer\n"); |
| 519 | goto errout; |
| 520 | } |
| 521 | |
| 522 | fstat(fd, &statbuf); |
| 523 | /* If the keys are kept on a raw block device, do not try to truncate it. */ |
| 524 | if (S_ISREG(statbuf.st_mode)) { |
| 525 | if (ftruncate(fd, 0x4000)) { |
| 526 | printf("Cannot set footer file size\n"); |
| 527 | goto errout; |
| 528 | } |
| 529 | } |
| 530 | |
| 531 | /* Success! */ |
| 532 | rc = 0; |
| 533 | |
| 534 | errout: |
| 535 | close(fd); |
| 536 | return rc; |
| 537 | |
| 538 | } |
| 539 | |
| 540 | static inline int unix_read(int fd, void* buff, int len) |
| 541 | { |
| 542 | return TEMP_FAILURE_RETRY(read(fd, buff, len)); |
| 543 | } |
| 544 | |
| 545 | static inline int unix_write(int fd, const void* buff, int len) |
| 546 | { |
| 547 | return TEMP_FAILURE_RETRY(write(fd, buff, len)); |
| 548 | } |
| 549 | |
| 550 | static void init_empty_persist_data(struct crypt_persist_data *pdata, int len) |
| 551 | { |
| 552 | memset(pdata, 0, len); |
| 553 | pdata->persist_magic = PERSIST_DATA_MAGIC; |
| 554 | pdata->persist_valid_entries = 0; |
| 555 | } |
| 556 | |
| 557 | /* A routine to update the passed in crypt_ftr to the lastest version. |
| 558 | * fd is open read/write on the device that holds the crypto footer and persistent |
| 559 | * data, crypt_ftr is a pointer to the struct to be updated, and offset is the |
| 560 | * absolute offset to the start of the crypt_mnt_ftr on the passed in fd. |
| 561 | */ |
| 562 | static void upgrade_crypt_ftr(int fd, struct crypt_mnt_ftr *crypt_ftr, off64_t offset) |
| 563 | { |
| 564 | int orig_major = crypt_ftr->major_version; |
| 565 | int orig_minor = crypt_ftr->minor_version; |
| 566 | printf("TWRP NOT upgrading crypto footer\n"); |
| 567 | return; // do not upgrade in recovery |
| 568 | if ((crypt_ftr->major_version == 1) && (crypt_ftr->minor_version == 0)) { |
| 569 | struct crypt_persist_data *pdata; |
| 570 | off64_t pdata_offset = offset + CRYPT_FOOTER_TO_PERSIST_OFFSET; |
| 571 | |
| 572 | printf("upgrading crypto footer to 1.1"); |
| 573 | |
| 574 | pdata = malloc(CRYPT_PERSIST_DATA_SIZE); |
| 575 | if (pdata == NULL) { |
| 576 | printf("Cannot allocate persisent data\n"); |
| 577 | return; |
| 578 | } |
| 579 | memset(pdata, 0, CRYPT_PERSIST_DATA_SIZE); |
| 580 | |
| 581 | /* Need to initialize the persistent data area */ |
| 582 | if (lseek64(fd, pdata_offset, SEEK_SET) == -1) { |
| 583 | printf("Cannot seek to persisent data offset\n"); |
| 584 | return; |
| 585 | } |
| 586 | /* Write all zeros to the first copy, making it invalid */ |
| 587 | unix_write(fd, pdata, CRYPT_PERSIST_DATA_SIZE); |
| 588 | |
| 589 | /* Write a valid but empty structure to the second copy */ |
| 590 | init_empty_persist_data(pdata, CRYPT_PERSIST_DATA_SIZE); |
| 591 | unix_write(fd, pdata, CRYPT_PERSIST_DATA_SIZE); |
| 592 | |
| 593 | /* Update the footer */ |
| 594 | crypt_ftr->persist_data_size = CRYPT_PERSIST_DATA_SIZE; |
| 595 | crypt_ftr->persist_data_offset[0] = pdata_offset; |
| 596 | crypt_ftr->persist_data_offset[1] = pdata_offset + CRYPT_PERSIST_DATA_SIZE; |
| 597 | crypt_ftr->minor_version = 1; |
| 598 | } |
| 599 | |
| 600 | if ((crypt_ftr->major_version == 1) && (crypt_ftr->minor_version == 1)) { |
| 601 | printf("upgrading crypto footer to 1.2"); |
| 602 | /* But keep the old kdf_type. |
| 603 | * It will get updated later to KDF_SCRYPT after the password has been verified. |
| 604 | */ |
| 605 | crypt_ftr->kdf_type = KDF_PBKDF2; |
| 606 | get_device_scrypt_params(crypt_ftr); |
| 607 | crypt_ftr->minor_version = 2; |
| 608 | } |
| 609 | |
| 610 | if ((crypt_ftr->major_version == 1) && (crypt_ftr->minor_version == 2)) { |
| 611 | printf("upgrading crypto footer to 1.3"); |
| 612 | crypt_ftr->crypt_type = CRYPT_TYPE_PASSWORD; |
| 613 | crypt_ftr->minor_version = 3; |
| 614 | } |
| 615 | |
| 616 | if ((orig_major != crypt_ftr->major_version) || (orig_minor != crypt_ftr->minor_version)) { |
| 617 | if (lseek64(fd, offset, SEEK_SET) == -1) { |
| 618 | printf("Cannot seek to crypt footer\n"); |
| 619 | return; |
| 620 | } |
| 621 | unix_write(fd, crypt_ftr, sizeof(struct crypt_mnt_ftr)); |
| 622 | } |
| 623 | } |
| 624 | |
| 625 | |
| 626 | static int get_crypt_ftr_and_key(struct crypt_mnt_ftr *crypt_ftr) |
| 627 | { |
| 628 | int fd; |
| 629 | unsigned int nr_sec, cnt; |
| 630 | off64_t starting_off; |
| 631 | int rc = -1; |
| 632 | char *fname = NULL; |
| 633 | struct stat statbuf; |
| 634 | |
| 635 | if (get_crypt_ftr_info(&fname, &starting_off)) { |
| 636 | printf("Unable to get crypt_ftr_info\n"); |
| 637 | return -1; |
| 638 | } |
| 639 | if (fname[0] != '/') { |
| 640 | printf("Unexpected value for crypto key location\n"); |
| 641 | return -1; |
| 642 | } |
| 643 | if ( (fd = open(fname, O_RDWR)) < 0) { |
| 644 | printf("Cannot open footer file %s for get\n", fname); |
| 645 | return -1; |
| 646 | } |
| 647 | |
| 648 | /* Make sure it's 16 Kbytes in length */ |
| 649 | fstat(fd, &statbuf); |
| 650 | if (S_ISREG(statbuf.st_mode) && (statbuf.st_size != 0x4000)) { |
| 651 | printf("footer file %s is not the expected size!\n", fname); |
| 652 | goto errout; |
| 653 | } |
| 654 | |
| 655 | /* Seek to the start of the crypt footer */ |
| 656 | if (lseek64(fd, starting_off, SEEK_SET) == -1) { |
| 657 | printf("Cannot seek to real block device footer\n"); |
| 658 | goto errout; |
| 659 | } |
| 660 | |
| 661 | if ( (cnt = read(fd, crypt_ftr, sizeof(struct crypt_mnt_ftr))) != sizeof(struct crypt_mnt_ftr)) { |
| 662 | printf("Cannot read real block device footer\n"); |
| 663 | goto errout; |
| 664 | } |
| 665 | |
| 666 | if (crypt_ftr->magic != CRYPT_MNT_MAGIC) { |
| 667 | printf("Bad magic for real block device %s\n", fname); |
| 668 | goto errout; |
| 669 | } |
| 670 | |
| 671 | if (crypt_ftr->major_version != CURRENT_MAJOR_VERSION) { |
| 672 | printf("Cannot understand major version %d real block device footer; expected %d\n", |
| 673 | crypt_ftr->major_version, CURRENT_MAJOR_VERSION); |
| 674 | goto errout; |
| 675 | } |
| 676 | |
| 677 | if (crypt_ftr->minor_version > CURRENT_MINOR_VERSION) { |
| 678 | printf("Warning: crypto footer minor version %d, expected <= %d, continuing...\n", |
| 679 | crypt_ftr->minor_version, CURRENT_MINOR_VERSION); |
| 680 | } |
| 681 | |
| 682 | /* If this is a verion 1.0 crypt_ftr, make it a 1.1 crypt footer, and update the |
| 683 | * copy on disk before returning. |
| 684 | */ |
| 685 | if (crypt_ftr->minor_version < CURRENT_MINOR_VERSION) { |
| 686 | upgrade_crypt_ftr(fd, crypt_ftr, starting_off); |
| 687 | } |
| 688 | |
| 689 | /* Success! */ |
| 690 | rc = 0; |
| 691 | |
| 692 | errout: |
| 693 | close(fd); |
| 694 | return rc; |
| 695 | } |
| 696 | |
| 697 | static int validate_persistent_data_storage(struct crypt_mnt_ftr *crypt_ftr) |
| 698 | { |
| 699 | if (crypt_ftr->persist_data_offset[0] + crypt_ftr->persist_data_size > |
| 700 | crypt_ftr->persist_data_offset[1]) { |
| 701 | printf("Crypt_ftr persist data regions overlap"); |
| 702 | return -1; |
| 703 | } |
| 704 | |
| 705 | if (crypt_ftr->persist_data_offset[0] >= crypt_ftr->persist_data_offset[1]) { |
| 706 | printf("Crypt_ftr persist data region 0 starts after region 1"); |
| 707 | return -1; |
| 708 | } |
| 709 | |
| 710 | if (((crypt_ftr->persist_data_offset[1] + crypt_ftr->persist_data_size) - |
| 711 | (crypt_ftr->persist_data_offset[0] - CRYPT_FOOTER_TO_PERSIST_OFFSET)) > |
| 712 | CRYPT_FOOTER_OFFSET) { |
| 713 | printf("Persistent data extends past crypto footer"); |
| 714 | return -1; |
| 715 | } |
| 716 | |
| 717 | return 0; |
| 718 | } |
| 719 | |
| 720 | static int load_persistent_data(void) |
| 721 | { |
| 722 | struct crypt_mnt_ftr crypt_ftr; |
| 723 | struct crypt_persist_data *pdata = NULL; |
| 724 | char encrypted_state[PROPERTY_VALUE_MAX]; |
| 725 | char *fname; |
| 726 | int found = 0; |
| 727 | int fd; |
| 728 | int ret; |
| 729 | int i; |
| 730 | |
| 731 | if (persist_data) { |
| 732 | /* Nothing to do, we've already loaded or initialized it */ |
| 733 | return 0; |
| 734 | } |
| 735 | |
| 736 | |
| 737 | /* If not encrypted, just allocate an empty table and initialize it */ |
| 738 | property_get("ro.crypto.state", encrypted_state, ""); |
| 739 | if (strcmp(encrypted_state, "encrypted") ) { |
| 740 | pdata = malloc(CRYPT_PERSIST_DATA_SIZE); |
| 741 | if (pdata) { |
| 742 | init_empty_persist_data(pdata, CRYPT_PERSIST_DATA_SIZE); |
| 743 | persist_data = pdata; |
| 744 | return 0; |
| 745 | } |
| 746 | return -1; |
| 747 | } |
| 748 | |
| 749 | if(get_crypt_ftr_and_key(&crypt_ftr)) { |
| 750 | return -1; |
| 751 | } |
| 752 | |
| 753 | if ((crypt_ftr.major_version < 1) |
| 754 | || (crypt_ftr.major_version == 1 && crypt_ftr.minor_version < 1)) { |
| 755 | printf("Crypt_ftr version doesn't support persistent data"); |
| 756 | return -1; |
| 757 | } |
| 758 | |
| 759 | if (get_crypt_ftr_info(&fname, NULL)) { |
| 760 | return -1; |
| 761 | } |
| 762 | |
| 763 | ret = validate_persistent_data_storage(&crypt_ftr); |
| 764 | if (ret) { |
| 765 | return -1; |
| 766 | } |
| 767 | |
| 768 | fd = open(fname, O_RDONLY); |
| 769 | if (fd < 0) { |
| 770 | printf("Cannot open %s metadata file", fname); |
| 771 | return -1; |
| 772 | } |
| 773 | |
| 774 | if (persist_data == NULL) { |
| 775 | pdata = malloc(crypt_ftr.persist_data_size); |
| 776 | if (pdata == NULL) { |
| 777 | printf("Cannot allocate memory for persistent data"); |
| 778 | goto err; |
| 779 | } |
| 780 | } |
| 781 | |
| 782 | for (i = 0; i < 2; i++) { |
| 783 | if (lseek64(fd, crypt_ftr.persist_data_offset[i], SEEK_SET) < 0) { |
| 784 | printf("Cannot seek to read persistent data on %s", fname); |
| 785 | goto err2; |
| 786 | } |
| 787 | if (unix_read(fd, pdata, crypt_ftr.persist_data_size) < 0){ |
| 788 | printf("Error reading persistent data on iteration %d", i); |
| 789 | goto err2; |
| 790 | } |
| 791 | if (pdata->persist_magic == PERSIST_DATA_MAGIC) { |
| 792 | found = 1; |
| 793 | break; |
| 794 | } |
| 795 | } |
| 796 | |
| 797 | if (!found) { |
| 798 | printf("Could not find valid persistent data, creating"); |
| 799 | init_empty_persist_data(pdata, crypt_ftr.persist_data_size); |
| 800 | } |
| 801 | |
| 802 | /* Success */ |
| 803 | persist_data = pdata; |
| 804 | close(fd); |
| 805 | return 0; |
| 806 | |
| 807 | err2: |
| 808 | free(pdata); |
| 809 | |
| 810 | err: |
| 811 | close(fd); |
| 812 | return -1; |
| 813 | } |
| 814 | |
| 815 | static int save_persistent_data(void) |
| 816 | { |
| 817 | struct crypt_mnt_ftr crypt_ftr; |
| 818 | struct crypt_persist_data *pdata; |
| 819 | char *fname; |
| 820 | off64_t write_offset; |
| 821 | off64_t erase_offset; |
| 822 | int found = 0; |
| 823 | int fd; |
| 824 | int ret; |
| 825 | |
| 826 | if (persist_data == NULL) { |
| 827 | printf("No persistent data to save"); |
| 828 | return -1; |
| 829 | } |
| 830 | |
| 831 | if(get_crypt_ftr_and_key(&crypt_ftr)) { |
| 832 | return -1; |
| 833 | } |
| 834 | |
| 835 | if ((crypt_ftr.major_version < 1) |
| 836 | || (crypt_ftr.major_version == 1 && crypt_ftr.minor_version < 1)) { |
| 837 | printf("Crypt_ftr version doesn't support persistent data"); |
| 838 | return -1; |
| 839 | } |
| 840 | |
| 841 | ret = validate_persistent_data_storage(&crypt_ftr); |
| 842 | if (ret) { |
| 843 | return -1; |
| 844 | } |
| 845 | |
| 846 | if (get_crypt_ftr_info(&fname, NULL)) { |
| 847 | return -1; |
| 848 | } |
| 849 | |
| 850 | fd = open(fname, O_RDWR); |
| 851 | if (fd < 0) { |
| 852 | printf("Cannot open %s metadata file", fname); |
| 853 | return -1; |
| 854 | } |
| 855 | |
| 856 | pdata = malloc(crypt_ftr.persist_data_size); |
| 857 | if (pdata == NULL) { |
| 858 | printf("Cannot allocate persistant data"); |
| 859 | goto err; |
| 860 | } |
| 861 | |
| 862 | if (lseek64(fd, crypt_ftr.persist_data_offset[0], SEEK_SET) < 0) { |
| 863 | printf("Cannot seek to read persistent data on %s", fname); |
| 864 | goto err2; |
| 865 | } |
| 866 | |
| 867 | if (unix_read(fd, pdata, crypt_ftr.persist_data_size) < 0) { |
| 868 | printf("Error reading persistent data before save"); |
| 869 | goto err2; |
| 870 | } |
| 871 | |
| 872 | if (pdata->persist_magic == PERSIST_DATA_MAGIC) { |
| 873 | /* The first copy is the curent valid copy, so write to |
| 874 | * the second copy and erase this one */ |
| 875 | write_offset = crypt_ftr.persist_data_offset[1]; |
| 876 | erase_offset = crypt_ftr.persist_data_offset[0]; |
| 877 | } else { |
| 878 | /* The second copy must be the valid copy, so write to |
| 879 | * the first copy, and erase the second */ |
| 880 | write_offset = crypt_ftr.persist_data_offset[0]; |
| 881 | erase_offset = crypt_ftr.persist_data_offset[1]; |
| 882 | } |
| 883 | |
| 884 | /* Write the new copy first, if successful, then erase the old copy */ |
| 885 | if (lseek(fd, write_offset, SEEK_SET) < 0) { |
| 886 | printf("Cannot seek to write persistent data"); |
| 887 | goto err2; |
| 888 | } |
| 889 | if (unix_write(fd, persist_data, crypt_ftr.persist_data_size) == |
| 890 | (int) crypt_ftr.persist_data_size) { |
| 891 | if (lseek(fd, erase_offset, SEEK_SET) < 0) { |
| 892 | printf("Cannot seek to erase previous persistent data"); |
| 893 | goto err2; |
| 894 | } |
| 895 | fsync(fd); |
| 896 | memset(pdata, 0, crypt_ftr.persist_data_size); |
| 897 | if (unix_write(fd, pdata, crypt_ftr.persist_data_size) != |
| 898 | (int) crypt_ftr.persist_data_size) { |
| 899 | printf("Cannot write to erase previous persistent data"); |
| 900 | goto err2; |
| 901 | } |
| 902 | fsync(fd); |
| 903 | } else { |
| 904 | printf("Cannot write to save persistent data"); |
| 905 | goto err2; |
| 906 | } |
| 907 | |
| 908 | /* Success */ |
| 909 | free(pdata); |
| 910 | close(fd); |
| 911 | return 0; |
| 912 | |
| 913 | err2: |
| 914 | free(pdata); |
| 915 | err: |
| 916 | close(fd); |
| 917 | return -1; |
| 918 | } |
| 919 | |
| 920 | static int hexdigit (char c) |
| 921 | { |
| 922 | if (c >= '0' && c <= '9') return c - '0'; |
| 923 | c = tolower(c); |
| 924 | if (c >= 'a' && c <= 'f') return c - 'a' + 10; |
| 925 | return -1; |
| 926 | } |
| 927 | |
| 928 | static unsigned char* convert_hex_ascii_to_key(const char* master_key_ascii, |
| 929 | unsigned int* out_keysize) |
| 930 | { |
| 931 | unsigned int i; |
| 932 | *out_keysize = 0; |
| 933 | |
| 934 | size_t size = strlen (master_key_ascii); |
| 935 | if (size % 2) { |
| 936 | printf("Trying to convert ascii string of odd length"); |
| 937 | return NULL; |
| 938 | } |
| 939 | |
| 940 | unsigned char* master_key = (unsigned char*) malloc(size / 2); |
| 941 | if (master_key == 0) { |
| 942 | printf("Cannot allocate"); |
| 943 | return NULL; |
| 944 | } |
| 945 | |
| 946 | for (i = 0; i < size; i += 2) { |
| 947 | int high_nibble = hexdigit (master_key_ascii[i]); |
| 948 | int low_nibble = hexdigit (master_key_ascii[i + 1]); |
| 949 | |
| 950 | if(high_nibble < 0 || low_nibble < 0) { |
| 951 | printf("Invalid hex string"); |
| 952 | free (master_key); |
| 953 | return NULL; |
| 954 | } |
| 955 | |
| 956 | master_key[*out_keysize] = high_nibble * 16 + low_nibble; |
| 957 | (*out_keysize)++; |
| 958 | } |
| 959 | |
| 960 | return master_key; |
| 961 | } |
| 962 | |
| 963 | /* Convert a binary key of specified length into an ascii hex string equivalent, |
| 964 | * without the leading 0x and with null termination |
| 965 | */ |
| 966 | static void convert_key_to_hex_ascii(unsigned char *master_key, unsigned int keysize, |
| 967 | char *master_key_ascii) |
| 968 | { |
| 969 | unsigned int i, a; |
| 970 | unsigned char nibble; |
| 971 | |
| 972 | for (i=0, a=0; i<keysize; i++, a+=2) { |
| 973 | /* For each byte, write out two ascii hex digits */ |
| 974 | nibble = (master_key[i] >> 4) & 0xf; |
| 975 | master_key_ascii[a] = nibble + (nibble > 9 ? 0x37 : 0x30); |
| 976 | |
| 977 | nibble = master_key[i] & 0xf; |
| 978 | master_key_ascii[a+1] = nibble + (nibble > 9 ? 0x37 : 0x30); |
| 979 | } |
| 980 | |
| 981 | /* Add the null termination */ |
| 982 | master_key_ascii[a] = '\0'; |
| 983 | |
| 984 | } |
| 985 | |
| 986 | static int load_crypto_mapping_table(struct crypt_mnt_ftr *crypt_ftr, unsigned char *master_key, |
| 987 | char *real_blk_name, const char *name, int fd, |
| 988 | char *extra_params) |
| 989 | { |
| 990 | char buffer[DM_CRYPT_BUF_SIZE]; |
| 991 | struct dm_ioctl *io; |
| 992 | struct dm_target_spec *tgt; |
| 993 | char *crypt_params; |
| 994 | char master_key_ascii[129]; /* Large enough to hold 512 bit key and null */ |
| 995 | int i; |
| 996 | |
| 997 | io = (struct dm_ioctl *) buffer; |
| 998 | |
| 999 | /* Load the mapping table for this device */ |
| 1000 | tgt = (struct dm_target_spec *) &buffer[sizeof(struct dm_ioctl)]; |
| 1001 | |
| 1002 | ioctl_init(io, DM_CRYPT_BUF_SIZE, name, 0); |
| 1003 | io->target_count = 1; |
| 1004 | tgt->status = 0; |
| 1005 | tgt->sector_start = 0; |
| 1006 | tgt->length = crypt_ftr->fs_size; |
| 1007 | strcpy(tgt->target_type, "crypt"); |
| 1008 | |
| 1009 | crypt_params = buffer + sizeof(struct dm_ioctl) + sizeof(struct dm_target_spec); |
| 1010 | convert_key_to_hex_ascii(master_key, crypt_ftr->keysize, master_key_ascii); |
| 1011 | sprintf(crypt_params, "%s %s 0 %s 0 %s", crypt_ftr->crypto_type_name, |
| 1012 | master_key_ascii, real_blk_name, extra_params); |
| 1013 | crypt_params += strlen(crypt_params) + 1; |
| 1014 | crypt_params = (char *) (((unsigned long)crypt_params + 7) & ~8); /* Align to an 8 byte boundary */ |
| 1015 | tgt->next = crypt_params - buffer; |
| 1016 | |
| 1017 | for (i = 0; i < TABLE_LOAD_RETRIES; i++) { |
| 1018 | if (! ioctl(fd, DM_TABLE_LOAD, io)) { |
| 1019 | break; |
| 1020 | } |
| 1021 | usleep(500000); |
| 1022 | } |
| 1023 | |
| 1024 | if (i == TABLE_LOAD_RETRIES) { |
| 1025 | /* We failed to load the table, return an error */ |
| 1026 | return -1; |
| 1027 | } else { |
| 1028 | return i + 1; |
| 1029 | } |
| 1030 | } |
| 1031 | |
| 1032 | |
| 1033 | static int get_dm_crypt_version(int fd, const char *name, int *version) |
| 1034 | { |
| 1035 | char buffer[DM_CRYPT_BUF_SIZE]; |
| 1036 | struct dm_ioctl *io; |
| 1037 | struct dm_target_versions *v; |
| 1038 | int i; |
| 1039 | |
| 1040 | io = (struct dm_ioctl *) buffer; |
| 1041 | |
| 1042 | ioctl_init(io, DM_CRYPT_BUF_SIZE, name, 0); |
| 1043 | |
| 1044 | if (ioctl(fd, DM_LIST_VERSIONS, io)) { |
| 1045 | return -1; |
| 1046 | } |
| 1047 | |
| 1048 | /* Iterate over the returned versions, looking for name of "crypt". |
| 1049 | * When found, get and return the version. |
| 1050 | */ |
| 1051 | v = (struct dm_target_versions *) &buffer[sizeof(struct dm_ioctl)]; |
| 1052 | while (v->next) { |
| 1053 | if (! strcmp(v->name, "crypt")) { |
| 1054 | /* We found the crypt driver, return the version, and get out */ |
| 1055 | version[0] = v->version[0]; |
| 1056 | version[1] = v->version[1]; |
| 1057 | version[2] = v->version[2]; |
| 1058 | return 0; |
| 1059 | } |
| 1060 | v = (struct dm_target_versions *)(((char *)v) + v->next); |
| 1061 | } |
| 1062 | |
| 1063 | return -1; |
| 1064 | } |
| 1065 | |
| 1066 | static int create_crypto_blk_dev(struct crypt_mnt_ftr *crypt_ftr, unsigned char *master_key, |
| 1067 | char *real_blk_name, char *crypto_blk_name, const char *name) |
| 1068 | { |
| 1069 | char buffer[DM_CRYPT_BUF_SIZE]; |
| 1070 | char master_key_ascii[129]; /* Large enough to hold 512 bit key and null */ |
| 1071 | char *crypt_params; |
| 1072 | struct dm_ioctl *io; |
| 1073 | struct dm_target_spec *tgt; |
| 1074 | unsigned int minor; |
| 1075 | int fd; |
| 1076 | int i; |
| 1077 | int retval = -1; |
| 1078 | int version[3]; |
| 1079 | char *extra_params; |
| 1080 | int load_count; |
| 1081 | |
| 1082 | if ((fd = open("/dev/device-mapper", O_RDWR)) < 0 ) { |
| 1083 | printf("Cannot open device-mapper\n"); |
| 1084 | goto errout; |
| 1085 | } |
| 1086 | |
| 1087 | io = (struct dm_ioctl *) buffer; |
| 1088 | |
| 1089 | ioctl_init(io, DM_CRYPT_BUF_SIZE, name, 0); |
| 1090 | if (ioctl(fd, DM_DEV_CREATE, io)) { |
| 1091 | printf("Cannot create dm-crypt device\n"); |
| 1092 | goto errout; |
| 1093 | } |
| 1094 | |
| 1095 | /* Get the device status, in particular, the name of it's device file */ |
| 1096 | ioctl_init(io, DM_CRYPT_BUF_SIZE, name, 0); |
| 1097 | if (ioctl(fd, DM_DEV_STATUS, io)) { |
| 1098 | printf("Cannot retrieve dm-crypt device status\n"); |
| 1099 | goto errout; |
| 1100 | } |
| 1101 | minor = (io->dev & 0xff) | ((io->dev >> 12) & 0xfff00); |
| 1102 | snprintf(crypto_blk_name, MAXPATHLEN, "/dev/block/dm-%u", minor); |
| 1103 | |
| 1104 | extra_params = ""; |
| 1105 | if (! get_dm_crypt_version(fd, name, version)) { |
| 1106 | /* Support for allow_discards was added in version 1.11.0 */ |
| 1107 | if ((version[0] >= 2) || |
| 1108 | ((version[0] == 1) && (version[1] >= 11))) { |
| 1109 | extra_params = "1 allow_discards"; |
| 1110 | printf("Enabling support for allow_discards in dmcrypt.\n"); |
| 1111 | } |
| 1112 | } |
| 1113 | |
| 1114 | load_count = load_crypto_mapping_table(crypt_ftr, master_key, real_blk_name, name, |
| 1115 | fd, extra_params); |
| 1116 | if (load_count < 0) { |
| 1117 | printf("Cannot load dm-crypt mapping table.\n"); |
| 1118 | goto errout; |
| 1119 | } else if (load_count > 1) { |
| 1120 | printf("Took %d tries to load dmcrypt table.\n", load_count); |
| 1121 | } |
| 1122 | |
| 1123 | /* Resume this device to activate it */ |
| 1124 | ioctl_init(io, DM_CRYPT_BUF_SIZE, name, 0); |
| 1125 | |
| 1126 | if (ioctl(fd, DM_DEV_SUSPEND, io)) { |
| 1127 | printf("Cannot resume the dm-crypt device\n"); |
| 1128 | goto errout; |
| 1129 | } |
| 1130 | |
| 1131 | /* We made it here with no errors. Woot! */ |
| 1132 | retval = 0; |
| 1133 | |
| 1134 | errout: |
| 1135 | close(fd); /* If fd is <0 from a failed open call, it's safe to just ignore the close error */ |
| 1136 | |
| 1137 | return retval; |
| 1138 | } |
| 1139 | |
| 1140 | static int delete_crypto_blk_dev(char *name) |
| 1141 | { |
| 1142 | int fd; |
| 1143 | char buffer[DM_CRYPT_BUF_SIZE]; |
| 1144 | struct dm_ioctl *io; |
| 1145 | int retval = -1; |
| 1146 | |
| 1147 | if ((fd = open("/dev/device-mapper", O_RDWR)) < 0 ) { |
| 1148 | printf("Cannot open device-mapper\n"); |
| 1149 | goto errout; |
| 1150 | } |
| 1151 | |
| 1152 | io = (struct dm_ioctl *) buffer; |
| 1153 | |
| 1154 | ioctl_init(io, DM_CRYPT_BUF_SIZE, name, 0); |
| 1155 | if (ioctl(fd, DM_DEV_REMOVE, io)) { |
| 1156 | printf("Cannot remove dm-crypt device\n"); |
| 1157 | goto errout; |
| 1158 | } |
| 1159 | |
| 1160 | /* We made it here with no errors. Woot! */ |
| 1161 | retval = 0; |
| 1162 | |
| 1163 | errout: |
| 1164 | close(fd); /* If fd is <0 from a failed open call, it's safe to just ignore the close error */ |
| 1165 | |
| 1166 | return retval; |
| 1167 | |
| 1168 | } |
| 1169 | |
| 1170 | static int pbkdf2(const char *passwd, const unsigned char *salt, |
| 1171 | unsigned char *ikey, void *params UNUSED) |
| 1172 | { |
| 1173 | printf("Using pbkdf2 for cryptfs KDF"); |
| 1174 | |
| 1175 | /* Turn the password into a key and IV that can decrypt the master key */ |
| 1176 | unsigned int keysize; |
| 1177 | char* master_key = (char*)convert_hex_ascii_to_key(passwd, &keysize); |
| 1178 | if (!master_key) return -1; |
| 1179 | PKCS5_PBKDF2_HMAC_SHA1(master_key, keysize, salt, SALT_LEN, |
| 1180 | HASH_COUNT, KEY_LEN_BYTES+IV_LEN_BYTES, ikey); |
| 1181 | |
| 1182 | memset(master_key, 0, keysize); |
| 1183 | free (master_key); |
| 1184 | return 0; |
| 1185 | } |
| 1186 | |
| 1187 | static int scrypt(const char *passwd, const unsigned char *salt, |
| 1188 | unsigned char *ikey, void *params) |
| 1189 | { |
| 1190 | printf("Using scrypt for cryptfs KDF\n"); |
| 1191 | |
| 1192 | struct crypt_mnt_ftr *ftr = (struct crypt_mnt_ftr *) params; |
| 1193 | |
| 1194 | int N = 1 << ftr->N_factor; |
| 1195 | int r = 1 << ftr->r_factor; |
| 1196 | int p = 1 << ftr->p_factor; |
| 1197 | |
| 1198 | /* Turn the password into a key and IV that can decrypt the master key */ |
| 1199 | unsigned int keysize; |
| 1200 | unsigned char* master_key = convert_hex_ascii_to_key(passwd, &keysize); |
| 1201 | if (!master_key) return -1; |
| 1202 | crypto_scrypt(master_key, keysize, salt, SALT_LEN, N, r, p, ikey, |
| 1203 | KEY_LEN_BYTES + IV_LEN_BYTES); |
| 1204 | |
| 1205 | memset(master_key, 0, keysize); |
| 1206 | free (master_key); |
| 1207 | return 0; |
| 1208 | } |
| 1209 | |
| 1210 | static int scrypt_keymaster(const char *passwd, const unsigned char *salt, |
| 1211 | unsigned char *ikey, void *params) |
| 1212 | { |
| 1213 | printf("Using scrypt with keymaster for cryptfs KDF\n"); |
| 1214 | |
| 1215 | int rc; |
| 1216 | unsigned int key_size; |
| 1217 | size_t signature_size; |
| 1218 | unsigned char* signature; |
| 1219 | struct crypt_mnt_ftr *ftr = (struct crypt_mnt_ftr *) params; |
| 1220 | |
| 1221 | int N = 1 << ftr->N_factor; |
| 1222 | int r = 1 << ftr->r_factor; |
| 1223 | int p = 1 << ftr->p_factor; |
| 1224 | |
| 1225 | unsigned char* master_key = convert_hex_ascii_to_key(passwd, &key_size); |
| 1226 | if (!master_key) { |
Ethan Yonker | cceebb8 | 2014-11-18 10:17:59 -0600 | [diff] [blame] | 1227 | printf("Failed to convert passwd from hex\n"); |
Ethan Yonker | 4eca40d | 2014-11-11 14:52:28 -0600 | [diff] [blame] | 1228 | return -1; |
| 1229 | } |
| 1230 | |
| 1231 | rc = crypto_scrypt(master_key, key_size, salt, SALT_LEN, |
| 1232 | N, r, p, ikey, KEY_LEN_BYTES + IV_LEN_BYTES); |
| 1233 | memset(master_key, 0, key_size); |
| 1234 | free(master_key); |
| 1235 | |
| 1236 | if (rc) { |
Ethan Yonker | cceebb8 | 2014-11-18 10:17:59 -0600 | [diff] [blame] | 1237 | printf("scrypt failed\n"); |
Ethan Yonker | 4eca40d | 2014-11-11 14:52:28 -0600 | [diff] [blame] | 1238 | return -1; |
| 1239 | } |
| 1240 | |
| 1241 | if (keymaster_sign_object(ftr, ikey, KEY_LEN_BYTES + IV_LEN_BYTES, |
| 1242 | &signature, &signature_size)) { |
Ethan Yonker | cceebb8 | 2014-11-18 10:17:59 -0600 | [diff] [blame] | 1243 | printf("Signing failed\n"); |
Ethan Yonker | 4eca40d | 2014-11-11 14:52:28 -0600 | [diff] [blame] | 1244 | return -1; |
| 1245 | } |
| 1246 | |
| 1247 | rc = crypto_scrypt(signature, signature_size, salt, SALT_LEN, |
| 1248 | N, r, p, ikey, KEY_LEN_BYTES + IV_LEN_BYTES); |
| 1249 | free(signature); |
| 1250 | |
| 1251 | if (rc) { |
Ethan Yonker | cceebb8 | 2014-11-18 10:17:59 -0600 | [diff] [blame] | 1252 | printf("scrypt failed\n"); |
Ethan Yonker | 4eca40d | 2014-11-11 14:52:28 -0600 | [diff] [blame] | 1253 | return -1; |
| 1254 | } |
| 1255 | |
| 1256 | return 0; |
| 1257 | } |
| 1258 | |
| 1259 | static int encrypt_master_key(const char *passwd, const unsigned char *salt, |
| 1260 | const unsigned char *decrypted_master_key, |
| 1261 | unsigned char *encrypted_master_key, |
| 1262 | struct crypt_mnt_ftr *crypt_ftr) |
| 1263 | { |
| 1264 | unsigned char ikey[32+32] = { 0 }; /* Big enough to hold a 256 bit key and 256 bit IV */ |
| 1265 | EVP_CIPHER_CTX e_ctx; |
| 1266 | int encrypted_len, final_len; |
| 1267 | int rc = 0; |
| 1268 | |
| 1269 | /* Turn the password into an intermediate key and IV that can decrypt the master key */ |
| 1270 | get_device_scrypt_params(crypt_ftr); |
| 1271 | |
| 1272 | switch (crypt_ftr->kdf_type) { |
| 1273 | case KDF_SCRYPT_KEYMASTER_UNPADDED: |
| 1274 | case KDF_SCRYPT_KEYMASTER_BADLY_PADDED: |
| 1275 | case KDF_SCRYPT_KEYMASTER: |
| 1276 | if (keymaster_create_key(crypt_ftr)) { |
| 1277 | printf("keymaster_create_key failed"); |
| 1278 | return -1; |
| 1279 | } |
| 1280 | |
| 1281 | if (scrypt_keymaster(passwd, salt, ikey, crypt_ftr)) { |
| 1282 | printf("scrypt failed"); |
| 1283 | return -1; |
| 1284 | } |
| 1285 | break; |
| 1286 | |
| 1287 | case KDF_SCRYPT: |
| 1288 | if (scrypt(passwd, salt, ikey, crypt_ftr)) { |
| 1289 | printf("scrypt failed"); |
| 1290 | return -1; |
| 1291 | } |
| 1292 | break; |
| 1293 | |
| 1294 | default: |
| 1295 | printf("Invalid kdf_type"); |
| 1296 | return -1; |
| 1297 | } |
| 1298 | |
| 1299 | /* Initialize the decryption engine */ |
| 1300 | if (! EVP_EncryptInit(&e_ctx, EVP_aes_128_cbc(), ikey, ikey+KEY_LEN_BYTES)) { |
| 1301 | printf("EVP_EncryptInit failed\n"); |
| 1302 | return -1; |
| 1303 | } |
| 1304 | EVP_CIPHER_CTX_set_padding(&e_ctx, 0); /* Turn off padding as our data is block aligned */ |
| 1305 | |
| 1306 | /* Encrypt the master key */ |
| 1307 | if (! EVP_EncryptUpdate(&e_ctx, encrypted_master_key, &encrypted_len, |
| 1308 | decrypted_master_key, KEY_LEN_BYTES)) { |
| 1309 | printf("EVP_EncryptUpdate failed\n"); |
| 1310 | return -1; |
| 1311 | } |
| 1312 | if (! EVP_EncryptFinal(&e_ctx, encrypted_master_key + encrypted_len, &final_len)) { |
| 1313 | printf("EVP_EncryptFinal failed\n"); |
| 1314 | return -1; |
| 1315 | } |
| 1316 | |
| 1317 | if (encrypted_len + final_len != KEY_LEN_BYTES) { |
| 1318 | printf("EVP_Encryption length check failed with %d, %d bytes\n", encrypted_len, final_len); |
| 1319 | return -1; |
| 1320 | } |
| 1321 | |
| 1322 | /* Store the scrypt of the intermediate key, so we can validate if it's a |
| 1323 | password error or mount error when things go wrong. |
| 1324 | Note there's no need to check for errors, since if this is incorrect, we |
| 1325 | simply won't wipe userdata, which is the correct default behavior |
| 1326 | */ |
| 1327 | int N = 1 << crypt_ftr->N_factor; |
| 1328 | int r = 1 << crypt_ftr->r_factor; |
| 1329 | int p = 1 << crypt_ftr->p_factor; |
| 1330 | |
| 1331 | rc = crypto_scrypt(ikey, KEY_LEN_BYTES, |
| 1332 | crypt_ftr->salt, sizeof(crypt_ftr->salt), N, r, p, |
| 1333 | crypt_ftr->scrypted_intermediate_key, |
| 1334 | sizeof(crypt_ftr->scrypted_intermediate_key)); |
| 1335 | |
| 1336 | if (rc) { |
| 1337 | printf("encrypt_master_key: crypto_scrypt failed"); |
| 1338 | } |
| 1339 | |
| 1340 | return 0; |
| 1341 | } |
| 1342 | |
| 1343 | static int decrypt_master_key_aux(char *passwd, unsigned char *salt, |
| 1344 | unsigned char *encrypted_master_key, |
| 1345 | unsigned char *decrypted_master_key, |
| 1346 | kdf_func kdf, void *kdf_params, |
| 1347 | unsigned char** intermediate_key, |
| 1348 | size_t* intermediate_key_size) |
| 1349 | { |
| 1350 | unsigned char ikey[32+32] = { 0 }; /* Big enough to hold a 256 bit key and 256 bit IV */ |
| 1351 | EVP_CIPHER_CTX d_ctx; |
| 1352 | int decrypted_len, final_len; |
| 1353 | |
| 1354 | /* Turn the password into an intermediate key and IV that can decrypt the |
| 1355 | master key */ |
| 1356 | if (kdf(passwd, salt, ikey, kdf_params)) { |
| 1357 | printf("kdf failed"); |
| 1358 | return -1; |
| 1359 | } |
| 1360 | |
| 1361 | /* Initialize the decryption engine */ |
| 1362 | if (! EVP_DecryptInit(&d_ctx, EVP_aes_128_cbc(), ikey, ikey+KEY_LEN_BYTES)) { |
| 1363 | return -1; |
| 1364 | } |
| 1365 | EVP_CIPHER_CTX_set_padding(&d_ctx, 0); /* Turn off padding as our data is block aligned */ |
| 1366 | /* Decrypt the master key */ |
| 1367 | if (! EVP_DecryptUpdate(&d_ctx, decrypted_master_key, &decrypted_len, |
| 1368 | encrypted_master_key, KEY_LEN_BYTES)) { |
| 1369 | return -1; |
| 1370 | } |
| 1371 | if (! EVP_DecryptFinal(&d_ctx, decrypted_master_key + decrypted_len, &final_len)) { |
| 1372 | return -1; |
| 1373 | } |
| 1374 | |
| 1375 | if (decrypted_len + final_len != KEY_LEN_BYTES) { |
| 1376 | return -1; |
| 1377 | } |
| 1378 | |
| 1379 | /* Copy intermediate key if needed by params */ |
| 1380 | if (intermediate_key && intermediate_key_size) { |
| 1381 | *intermediate_key = (unsigned char*) malloc(KEY_LEN_BYTES); |
| 1382 | if (intermediate_key) { |
| 1383 | memcpy(*intermediate_key, ikey, KEY_LEN_BYTES); |
| 1384 | *intermediate_key_size = KEY_LEN_BYTES; |
| 1385 | } |
| 1386 | } |
| 1387 | |
| 1388 | return 0; |
| 1389 | } |
| 1390 | |
| 1391 | static void get_kdf_func(struct crypt_mnt_ftr *ftr, kdf_func *kdf, void** kdf_params) |
| 1392 | { |
| 1393 | if (ftr->kdf_type == KDF_SCRYPT_KEYMASTER_UNPADDED || |
| 1394 | ftr->kdf_type == KDF_SCRYPT_KEYMASTER_BADLY_PADDED || |
| 1395 | ftr->kdf_type == KDF_SCRYPT_KEYMASTER) { |
| 1396 | *kdf = scrypt_keymaster; |
| 1397 | *kdf_params = ftr; |
| 1398 | } else if (ftr->kdf_type == KDF_SCRYPT) { |
| 1399 | *kdf = scrypt; |
| 1400 | *kdf_params = ftr; |
| 1401 | } else { |
| 1402 | *kdf = pbkdf2; |
| 1403 | *kdf_params = NULL; |
| 1404 | } |
| 1405 | } |
| 1406 | |
| 1407 | static int decrypt_master_key(char *passwd, unsigned char *decrypted_master_key, |
| 1408 | struct crypt_mnt_ftr *crypt_ftr, |
| 1409 | unsigned char** intermediate_key, |
| 1410 | size_t* intermediate_key_size) |
| 1411 | { |
| 1412 | kdf_func kdf; |
| 1413 | void *kdf_params; |
| 1414 | int ret; |
| 1415 | |
| 1416 | get_kdf_func(crypt_ftr, &kdf, &kdf_params); |
| 1417 | ret = decrypt_master_key_aux(passwd, crypt_ftr->salt, crypt_ftr->master_key, |
| 1418 | decrypted_master_key, kdf, kdf_params, |
| 1419 | intermediate_key, intermediate_key_size); |
| 1420 | if (ret != 0) { |
| 1421 | printf("failure decrypting master key"); |
| 1422 | } |
| 1423 | |
| 1424 | return ret; |
| 1425 | } |
| 1426 | |
| 1427 | static int create_encrypted_random_key(char *passwd, unsigned char *master_key, unsigned char *salt, |
| 1428 | struct crypt_mnt_ftr *crypt_ftr) { |
| 1429 | int fd; |
| 1430 | unsigned char key_buf[KEY_LEN_BYTES]; |
| 1431 | EVP_CIPHER_CTX e_ctx; |
| 1432 | int encrypted_len, final_len; |
| 1433 | |
| 1434 | /* Get some random bits for a key */ |
| 1435 | fd = open("/dev/urandom", O_RDONLY); |
| 1436 | read(fd, key_buf, sizeof(key_buf)); |
| 1437 | read(fd, salt, SALT_LEN); |
| 1438 | close(fd); |
| 1439 | |
| 1440 | /* Now encrypt it with the password */ |
| 1441 | return encrypt_master_key(passwd, salt, key_buf, master_key, crypt_ftr); |
| 1442 | } |
| 1443 | |
| 1444 | static int wait_and_unmount(char *mountpoint, bool kill) |
| 1445 | { |
| 1446 | int i, err, rc; |
| 1447 | #define WAIT_UNMOUNT_COUNT 20 |
| 1448 | |
| 1449 | /* Now umount the tmpfs filesystem */ |
| 1450 | for (i=0; i<WAIT_UNMOUNT_COUNT; i++) { |
| 1451 | if (umount(mountpoint) == 0) { |
| 1452 | break; |
| 1453 | } |
| 1454 | |
| 1455 | if (errno == EINVAL) { |
| 1456 | /* EINVAL is returned if the directory is not a mountpoint, |
| 1457 | * i.e. there is no filesystem mounted there. So just get out. |
| 1458 | */ |
| 1459 | break; |
| 1460 | } |
| 1461 | |
| 1462 | err = errno; |
| 1463 | |
| 1464 | /* If allowed, be increasingly aggressive before the last two retries */ |
| 1465 | if (kill) { |
| 1466 | if (i == (WAIT_UNMOUNT_COUNT - 3)) { |
| 1467 | printf("sending SIGHUP to processes with open files\n"); |
| 1468 | //vold_killProcessesWithOpenFiles(mountpoint, 1); |
| 1469 | } else if (i == (WAIT_UNMOUNT_COUNT - 2)) { |
| 1470 | printf("sending SIGKILL to processes with open files\n"); |
| 1471 | //vold_killProcessesWithOpenFiles(mountpoint, 2); |
| 1472 | } |
| 1473 | } |
| 1474 | |
| 1475 | sleep(1); |
| 1476 | } |
| 1477 | |
| 1478 | if (i < WAIT_UNMOUNT_COUNT) { |
| 1479 | printf("unmounting %s succeeded\n", mountpoint); |
| 1480 | rc = 0; |
| 1481 | } else { |
| 1482 | //vold_killProcessesWithOpenFiles(mountpoint, 0); |
| 1483 | printf("unmounting %s failed: %s\n", mountpoint, strerror(err)); |
| 1484 | rc = -1; |
| 1485 | } |
| 1486 | |
| 1487 | return rc; |
| 1488 | } |
| 1489 | |
| 1490 | #define DATA_PREP_TIMEOUT 200 |
| 1491 | static int prep_data_fs(void) |
| 1492 | { |
| 1493 | int i; |
| 1494 | |
| 1495 | /* Do the prep of the /data filesystem */ |
| 1496 | property_set("vold.post_fs_data_done", "0"); |
| 1497 | property_set("vold.decrypt", "trigger_post_fs_data"); |
| 1498 | printf("Just triggered post_fs_data\n"); |
| 1499 | |
| 1500 | /* Wait a max of 50 seconds, hopefully it takes much less */ |
| 1501 | for (i=0; i<DATA_PREP_TIMEOUT; i++) { |
| 1502 | char p[PROPERTY_VALUE_MAX]; |
| 1503 | |
| 1504 | property_get("vold.post_fs_data_done", p, "0"); |
| 1505 | if (*p == '1') { |
| 1506 | break; |
| 1507 | } else { |
| 1508 | usleep(250000); |
| 1509 | } |
| 1510 | } |
| 1511 | if (i == DATA_PREP_TIMEOUT) { |
| 1512 | /* Ugh, we failed to prep /data in time. Bail. */ |
| 1513 | printf("post_fs_data timed out!\n"); |
| 1514 | return -1; |
| 1515 | } else { |
| 1516 | printf("post_fs_data done\n"); |
| 1517 | return 0; |
| 1518 | } |
| 1519 | } |
| 1520 | |
| 1521 | static void cryptfs_set_corrupt() |
| 1522 | { |
| 1523 | // Mark the footer as bad |
| 1524 | struct crypt_mnt_ftr crypt_ftr; |
| 1525 | if (get_crypt_ftr_and_key(&crypt_ftr)) { |
| 1526 | printf("Failed to get crypto footer - panic"); |
| 1527 | return; |
| 1528 | } |
| 1529 | |
| 1530 | crypt_ftr.flags |= CRYPT_DATA_CORRUPT; |
| 1531 | if (put_crypt_ftr_and_key(&crypt_ftr)) { |
| 1532 | printf("Failed to set crypto footer - panic"); |
| 1533 | return; |
| 1534 | } |
| 1535 | } |
| 1536 | |
| 1537 | static void cryptfs_trigger_restart_min_framework() |
| 1538 | { |
| 1539 | if (fs_mgr_do_tmpfs_mount(DATA_MNT_POINT)) { |
| 1540 | printf("Failed to mount tmpfs on data - panic"); |
| 1541 | return; |
| 1542 | } |
| 1543 | |
| 1544 | if (property_set("vold.decrypt", "trigger_post_fs_data")) { |
| 1545 | printf("Failed to trigger post fs data - panic"); |
| 1546 | return; |
| 1547 | } |
| 1548 | |
| 1549 | if (property_set("vold.decrypt", "trigger_restart_min_framework")) { |
| 1550 | printf("Failed to trigger restart min framework - panic"); |
| 1551 | return; |
| 1552 | } |
| 1553 | } |
| 1554 | |
| 1555 | /* returns < 0 on failure */ |
| 1556 | static int cryptfs_restart_internal(int restart_main) |
| 1557 | { |
| 1558 | char fs_type[32]; |
| 1559 | char real_blkdev[MAXPATHLEN]; |
| 1560 | char crypto_blkdev[MAXPATHLEN]; |
| 1561 | char fs_options[256]; |
| 1562 | unsigned long mnt_flags; |
| 1563 | struct stat statbuf; |
| 1564 | int rc = -1, i; |
| 1565 | static int restart_successful = 0; |
| 1566 | |
| 1567 | /* Validate that it's OK to call this routine */ |
| 1568 | if (! master_key_saved) { |
| 1569 | printf("Encrypted filesystem not validated, aborting"); |
| 1570 | return -1; |
| 1571 | } |
| 1572 | |
| 1573 | if (restart_successful) { |
| 1574 | printf("System already restarted with encrypted disk, aborting"); |
| 1575 | return -1; |
| 1576 | } |
| 1577 | |
| 1578 | if (restart_main) { |
| 1579 | /* Here is where we shut down the framework. The init scripts |
| 1580 | * start all services in one of three classes: core, main or late_start. |
| 1581 | * On boot, we start core and main. Now, we stop main, but not core, |
| 1582 | * as core includes vold and a few other really important things that |
| 1583 | * we need to keep running. Once main has stopped, we should be able |
| 1584 | * to umount the tmpfs /data, then mount the encrypted /data. |
| 1585 | * We then restart the class main, and also the class late_start. |
| 1586 | * At the moment, I've only put a few things in late_start that I know |
| 1587 | * are not needed to bring up the framework, and that also cause problems |
| 1588 | * with unmounting the tmpfs /data, but I hope to add add more services |
| 1589 | * to the late_start class as we optimize this to decrease the delay |
| 1590 | * till the user is asked for the password to the filesystem. |
| 1591 | */ |
| 1592 | |
| 1593 | /* The init files are setup to stop the class main when vold.decrypt is |
| 1594 | * set to trigger_reset_main. |
| 1595 | */ |
| 1596 | property_set("vold.decrypt", "trigger_reset_main"); |
| 1597 | printf("Just asked init to shut down class main\n"); |
| 1598 | |
| 1599 | /* Ugh, shutting down the framework is not synchronous, so until it |
| 1600 | * can be fixed, this horrible hack will wait a moment for it all to |
| 1601 | * shut down before proceeding. Without it, some devices cannot |
| 1602 | * restart the graphics services. |
| 1603 | */ |
| 1604 | sleep(2); |
| 1605 | } |
| 1606 | |
| 1607 | /* Now that the framework is shutdown, we should be able to umount() |
| 1608 | * the tmpfs filesystem, and mount the real one. |
| 1609 | */ |
| 1610 | |
| 1611 | property_get("ro.crypto.fs_crypto_blkdev", crypto_blkdev, ""); |
| 1612 | if (strlen(crypto_blkdev) == 0) { |
| 1613 | printf("fs_crypto_blkdev not set\n"); |
| 1614 | return -1; |
| 1615 | } |
| 1616 | |
| 1617 | if (! (rc = wait_and_unmount(DATA_MNT_POINT, true)) ) { |
| 1618 | /* If ro.crypto.readonly is set to 1, mount the decrypted |
| 1619 | * filesystem readonly. This is used when /data is mounted by |
| 1620 | * recovery mode. |
| 1621 | */ |
| 1622 | char ro_prop[PROPERTY_VALUE_MAX]; |
| 1623 | property_get("ro.crypto.readonly", ro_prop, ""); |
| 1624 | if (strlen(ro_prop) > 0 && atoi(ro_prop)) { |
| 1625 | struct fstab_rec* rec = fs_mgr_get_entry_for_mount_point(fstab, DATA_MNT_POINT); |
| 1626 | rec->flags |= MS_RDONLY; |
| 1627 | } |
| 1628 | |
| 1629 | /* If that succeeded, then mount the decrypted filesystem */ |
| 1630 | int retries = RETRY_MOUNT_ATTEMPTS; |
| 1631 | int mount_rc; |
| 1632 | while ((mount_rc = fs_mgr_do_mount(fstab, DATA_MNT_POINT, |
| 1633 | crypto_blkdev, 0)) |
| 1634 | != 0) { |
| 1635 | if (mount_rc == FS_MGR_DOMNT_BUSY) { |
| 1636 | /* TODO: invoke something similar to |
| 1637 | Process::killProcessWithOpenFiles(DATA_MNT_POINT, |
| 1638 | retries > RETRY_MOUNT_ATTEMPT/2 ? 1 : 2 ) */ |
| 1639 | printf("Failed to mount %s because it is busy - waiting", |
| 1640 | crypto_blkdev); |
| 1641 | if (--retries) { |
| 1642 | sleep(RETRY_MOUNT_DELAY_SECONDS); |
| 1643 | } else { |
| 1644 | /* Let's hope that a reboot clears away whatever is keeping |
| 1645 | the mount busy */ |
| 1646 | cryptfs_reboot(reboot); |
| 1647 | } |
| 1648 | } else { |
| 1649 | printf("Failed to mount decrypted data"); |
| 1650 | cryptfs_set_corrupt(); |
| 1651 | cryptfs_trigger_restart_min_framework(); |
| 1652 | printf("Started framework to offer wipe"); |
| 1653 | return -1; |
| 1654 | } |
| 1655 | } |
| 1656 | |
| 1657 | property_set("vold.decrypt", "trigger_load_persist_props"); |
| 1658 | /* Create necessary paths on /data */ |
| 1659 | if (prep_data_fs()) { |
| 1660 | return -1; |
| 1661 | } |
| 1662 | |
| 1663 | /* startup service classes main and late_start */ |
| 1664 | property_set("vold.decrypt", "trigger_restart_framework"); |
| 1665 | printf("Just triggered restart_framework\n"); |
| 1666 | |
| 1667 | /* Give it a few moments to get started */ |
| 1668 | sleep(1); |
| 1669 | } |
| 1670 | |
| 1671 | if (rc == 0) { |
| 1672 | restart_successful = 1; |
| 1673 | } |
| 1674 | |
| 1675 | return rc; |
| 1676 | } |
| 1677 | |
| 1678 | int cryptfs_restart(void) |
| 1679 | { |
| 1680 | /* Call internal implementation forcing a restart of main service group */ |
| 1681 | return cryptfs_restart_internal(1); |
| 1682 | } |
| 1683 | |
| 1684 | static int do_crypto_complete(char *mount_point UNUSED) |
| 1685 | { |
| 1686 | struct crypt_mnt_ftr crypt_ftr; |
| 1687 | char encrypted_state[PROPERTY_VALUE_MAX]; |
| 1688 | char key_loc[PROPERTY_VALUE_MAX]; |
| 1689 | |
| 1690 | property_get("ro.crypto.state", encrypted_state, ""); |
| 1691 | if (strcmp(encrypted_state, "encrypted") ) { |
| 1692 | printf("not running with encryption, aborting"); |
| 1693 | return CRYPTO_COMPLETE_NOT_ENCRYPTED; |
| 1694 | } |
| 1695 | |
| 1696 | if (get_crypt_ftr_and_key(&crypt_ftr)) { |
| 1697 | fs_mgr_get_crypt_info(fstab, key_loc, 0, sizeof(key_loc)); |
| 1698 | |
| 1699 | /* |
| 1700 | * Only report this error if key_loc is a file and it exists. |
| 1701 | * If the device was never encrypted, and /data is not mountable for |
| 1702 | * some reason, returning 1 should prevent the UI from presenting the |
| 1703 | * a "enter password" screen, or worse, a "press button to wipe the |
| 1704 | * device" screen. |
| 1705 | */ |
| 1706 | if ((key_loc[0] == '/') && (access("key_loc", F_OK) == -1)) { |
| 1707 | printf("master key file does not exist, aborting"); |
| 1708 | return CRYPTO_COMPLETE_NOT_ENCRYPTED; |
| 1709 | } else { |
| 1710 | printf("Error getting crypt footer and key\n"); |
| 1711 | return CRYPTO_COMPLETE_BAD_METADATA; |
| 1712 | } |
| 1713 | } |
| 1714 | |
| 1715 | // Test for possible error flags |
| 1716 | if (crypt_ftr.flags & CRYPT_ENCRYPTION_IN_PROGRESS){ |
| 1717 | printf("Encryption process is partway completed\n"); |
| 1718 | return CRYPTO_COMPLETE_PARTIAL; |
| 1719 | } |
| 1720 | |
| 1721 | if (crypt_ftr.flags & CRYPT_INCONSISTENT_STATE){ |
| 1722 | printf("Encryption process was interrupted but cannot continue\n"); |
| 1723 | return CRYPTO_COMPLETE_INCONSISTENT; |
| 1724 | } |
| 1725 | |
| 1726 | if (crypt_ftr.flags & CRYPT_DATA_CORRUPT){ |
| 1727 | printf("Encryption is successful but data is corrupt\n"); |
| 1728 | return CRYPTO_COMPLETE_CORRUPT; |
| 1729 | } |
| 1730 | |
| 1731 | /* We passed the test! We shall diminish, and return to the west */ |
| 1732 | return CRYPTO_COMPLETE_ENCRYPTED; |
| 1733 | } |
| 1734 | |
| 1735 | static int test_mount_encrypted_fs(struct crypt_mnt_ftr* crypt_ftr, |
| 1736 | char *passwd, char *mount_point, char *label) |
| 1737 | { |
| 1738 | /* Allocate enough space for a 256 bit key, but we may use less */ |
| 1739 | unsigned char decrypted_master_key[32]; |
| 1740 | char crypto_blkdev[MAXPATHLEN]; |
| 1741 | char real_blkdev[MAXPATHLEN]; |
| 1742 | char tmp_mount_point[64]; |
| 1743 | unsigned int orig_failed_decrypt_count; |
| 1744 | int rc; |
| 1745 | kdf_func kdf; |
| 1746 | void *kdf_params; |
| 1747 | int use_keymaster = 0; |
| 1748 | int upgrade = 0; |
| 1749 | unsigned char* intermediate_key = 0; |
| 1750 | size_t intermediate_key_size = 0; |
| 1751 | |
| 1752 | printf("crypt_ftr->fs_size = %lld\n", crypt_ftr->fs_size); |
| 1753 | orig_failed_decrypt_count = crypt_ftr->failed_decrypt_count; |
| 1754 | |
| 1755 | if (! (crypt_ftr->flags & CRYPT_MNT_KEY_UNENCRYPTED) ) { |
| 1756 | if (decrypt_master_key(passwd, decrypted_master_key, crypt_ftr, |
| 1757 | &intermediate_key, &intermediate_key_size)) { |
| 1758 | printf("Failed to decrypt master key\n"); |
| 1759 | rc = -1; |
| 1760 | goto errout; |
| 1761 | } |
| 1762 | } |
| 1763 | |
| 1764 | fs_mgr_get_crypt_info(fstab, 0, real_blkdev, sizeof(real_blkdev)); |
| 1765 | |
| 1766 | // Create crypto block device - all (non fatal) code paths |
| 1767 | // need it |
| 1768 | if (create_crypto_blk_dev(crypt_ftr, decrypted_master_key, |
| 1769 | real_blkdev, crypto_blkdev, label)) { |
| 1770 | printf("Error creating decrypted block device\n"); |
| 1771 | rc = -1; |
| 1772 | goto errout; |
| 1773 | } |
| 1774 | |
| 1775 | /* Work out if the problem is the password or the data */ |
| 1776 | unsigned char scrypted_intermediate_key[sizeof(crypt_ftr-> |
| 1777 | scrypted_intermediate_key)]; |
| 1778 | int N = 1 << crypt_ftr->N_factor; |
| 1779 | int r = 1 << crypt_ftr->r_factor; |
| 1780 | int p = 1 << crypt_ftr->p_factor; |
| 1781 | |
| 1782 | rc = crypto_scrypt(intermediate_key, intermediate_key_size, |
| 1783 | crypt_ftr->salt, sizeof(crypt_ftr->salt), |
| 1784 | N, r, p, scrypted_intermediate_key, |
| 1785 | sizeof(scrypted_intermediate_key)); |
| 1786 | |
| 1787 | // Does the key match the crypto footer? |
| 1788 | if (rc == 0 && memcmp(scrypted_intermediate_key, |
| 1789 | crypt_ftr->scrypted_intermediate_key, |
| 1790 | sizeof(scrypted_intermediate_key)) == 0) { |
| 1791 | printf("Password matches\n"); |
| 1792 | rc = 0; |
| 1793 | } else { |
| 1794 | /* Try mounting the file system anyway, just in case the problem's with |
| 1795 | * the footer, not the key. */ |
| 1796 | sprintf(tmp_mount_point, "%s/tmp_mnt", mount_point); |
| 1797 | mkdir(tmp_mount_point, 0755); |
| 1798 | if (fs_mgr_do_mount(fstab, DATA_MNT_POINT, crypto_blkdev, tmp_mount_point)) { |
| 1799 | printf("Error temp mounting decrypted block device '%s'\n", crypto_blkdev); |
| 1800 | delete_crypto_blk_dev(label); |
| 1801 | |
| 1802 | rc = ++crypt_ftr->failed_decrypt_count; |
| 1803 | //put_crypt_ftr_and_key(crypt_ftr); // Do not penalize for attempting to decrypt in recovery |
| 1804 | } else { |
| 1805 | /* Success! */ |
| 1806 | printf("Password did not match but decrypted drive mounted - continue\n"); |
| 1807 | umount(tmp_mount_point); |
| 1808 | rc = 0; |
| 1809 | } |
| 1810 | } |
| 1811 | |
| 1812 | if (rc == 0) { |
| 1813 | /*crypt_ftr->failed_decrypt_count = 0; |
| 1814 | if (orig_failed_decrypt_count != 0) { |
| 1815 | put_crypt_ftr_and_key(crypt_ftr); |
| 1816 | }*/ |
| 1817 | |
| 1818 | /* Save the name of the crypto block device |
| 1819 | * so we can mount it when restarting the framework. */ |
| 1820 | property_set("ro.crypto.fs_crypto_blkdev", crypto_blkdev); |
| 1821 | |
| 1822 | /* Also save a the master key so we can reencrypted the key |
| 1823 | * the key when we want to change the password on it. */ |
| 1824 | /*memcpy(saved_master_key, decrypted_master_key, KEY_LEN_BYTES); |
| 1825 | saved_mount_point = strdup(mount_point); |
| 1826 | master_key_saved = 1; |
| 1827 | printf("%s(): Master key saved\n", __FUNCTION__);*/ |
| 1828 | rc = 0; |
| 1829 | |
| 1830 | // Upgrade if we're not using the latest KDF. |
| 1831 | /*use_keymaster = keymaster_check_compatibility(); |
| 1832 | if (crypt_ftr->kdf_type == KDF_SCRYPT_KEYMASTER) { |
| 1833 | // Don't allow downgrade |
| 1834 | } else if (use_keymaster == 1 && crypt_ftr->kdf_type != KDF_SCRYPT_KEYMASTER) { |
| 1835 | crypt_ftr->kdf_type = KDF_SCRYPT_KEYMASTER; |
| 1836 | upgrade = 1; |
| 1837 | } else if (use_keymaster == 0 && crypt_ftr->kdf_type != KDF_SCRYPT) { |
| 1838 | crypt_ftr->kdf_type = KDF_SCRYPT; |
| 1839 | upgrade = 1; |
| 1840 | } |
| 1841 | |
| 1842 | if (upgrade) { |
| 1843 | rc = encrypt_master_key(passwd, crypt_ftr->salt, saved_master_key, |
| 1844 | crypt_ftr->master_key, crypt_ftr); |
| 1845 | if (!rc) { |
| 1846 | rc = put_crypt_ftr_and_key(crypt_ftr); |
| 1847 | } |
| 1848 | printf("Key Derivation Function upgrade: rc=%d\n", rc); |
| 1849 | |
| 1850 | // Do not fail even if upgrade failed - machine is bootable |
| 1851 | // Note that if this code is ever hit, there is a *serious* problem |
| 1852 | // since KDFs should never fail. You *must* fix the kdf before |
| 1853 | // proceeding! |
| 1854 | if (rc) { |
| 1855 | printf("Upgrade failed with error %d," |
| 1856 | " but continuing with previous state\n", |
| 1857 | rc); |
| 1858 | rc = 0; |
| 1859 | } |
| 1860 | }*/ |
| 1861 | } |
| 1862 | |
| 1863 | errout: |
| 1864 | if (intermediate_key) { |
| 1865 | memset(intermediate_key, 0, intermediate_key_size); |
| 1866 | free(intermediate_key); |
| 1867 | } |
| 1868 | return rc; |
| 1869 | } |
| 1870 | |
| 1871 | /* Called by vold when it wants to undo the crypto mapping of a volume it |
| 1872 | * manages. This is usually in response to a factory reset, when we want |
| 1873 | * to undo the crypto mapping so the volume is formatted in the clear. |
| 1874 | */ |
| 1875 | int cryptfs_revert_volume(const char *label) |
| 1876 | { |
| 1877 | return delete_crypto_blk_dev((char *)label); |
| 1878 | } |
| 1879 | |
| 1880 | /* |
| 1881 | * Called by vold when it's asked to mount an encrypted, nonremovable volume. |
| 1882 | * Setup a dm-crypt mapping, use the saved master key from |
| 1883 | * setting up the /data mapping, and return the new device path. |
| 1884 | */ |
| 1885 | int cryptfs_setup_volume(const char *label, int major, int minor, |
| 1886 | char *crypto_sys_path, unsigned int max_path, |
| 1887 | int *new_major, int *new_minor) |
| 1888 | { |
| 1889 | char real_blkdev[MAXPATHLEN], crypto_blkdev[MAXPATHLEN]; |
| 1890 | struct crypt_mnt_ftr sd_crypt_ftr; |
| 1891 | struct stat statbuf; |
| 1892 | int nr_sec, fd; |
| 1893 | |
| 1894 | sprintf(real_blkdev, "/dev/block/vold/%d:%d", major, minor); |
| 1895 | |
| 1896 | get_crypt_ftr_and_key(&sd_crypt_ftr); |
| 1897 | |
| 1898 | /* Update the fs_size field to be the size of the volume */ |
| 1899 | fd = open(real_blkdev, O_RDONLY); |
| 1900 | nr_sec = get_blkdev_size(fd); |
| 1901 | close(fd); |
| 1902 | if (nr_sec == 0) { |
| 1903 | printf("Cannot get size of volume %s\n", real_blkdev); |
| 1904 | return -1; |
| 1905 | } |
| 1906 | |
| 1907 | sd_crypt_ftr.fs_size = nr_sec; |
| 1908 | create_crypto_blk_dev(&sd_crypt_ftr, saved_master_key, real_blkdev, |
| 1909 | crypto_blkdev, label); |
| 1910 | |
| 1911 | stat(crypto_blkdev, &statbuf); |
| 1912 | *new_major = MAJOR(statbuf.st_rdev); |
| 1913 | *new_minor = MINOR(statbuf.st_rdev); |
| 1914 | |
| 1915 | /* Create path to sys entry for this block device */ |
| 1916 | snprintf(crypto_sys_path, max_path, "/devices/virtual/block/%s", strrchr(crypto_blkdev, '/')+1); |
| 1917 | |
| 1918 | return 0; |
| 1919 | } |
| 1920 | |
| 1921 | int cryptfs_crypto_complete(void) |
| 1922 | { |
| 1923 | return do_crypto_complete("/data"); |
| 1924 | } |
| 1925 | |
| 1926 | int check_unmounted_and_get_ftr(struct crypt_mnt_ftr* crypt_ftr) |
| 1927 | { |
| 1928 | char encrypted_state[PROPERTY_VALUE_MAX]; |
| 1929 | property_get("ro.crypto.state", encrypted_state, ""); |
| 1930 | if ( master_key_saved || strcmp(encrypted_state, "encrypted") ) { |
| 1931 | printf("encrypted fs already validated or not running with encryption," |
Ethan Yonker | cceebb8 | 2014-11-18 10:17:59 -0600 | [diff] [blame] | 1932 | " aborting\n"); |
| 1933 | //return -1; |
Ethan Yonker | 4eca40d | 2014-11-11 14:52:28 -0600 | [diff] [blame] | 1934 | } |
| 1935 | |
| 1936 | if (get_crypt_ftr_and_key(crypt_ftr)) { |
Ethan Yonker | cceebb8 | 2014-11-18 10:17:59 -0600 | [diff] [blame] | 1937 | printf("Error getting crypt footer and key\n"); |
Ethan Yonker | 4eca40d | 2014-11-11 14:52:28 -0600 | [diff] [blame] | 1938 | return -1; |
| 1939 | } |
| 1940 | |
| 1941 | return 0; |
| 1942 | } |
| 1943 | |
| 1944 | /* |
| 1945 | * TODO - transition patterns to new format in calling code |
| 1946 | * and remove this vile hack, and the use of hex in |
| 1947 | * the password passing code. |
| 1948 | * |
| 1949 | * Patterns are passed in zero based (i.e. the top left dot |
| 1950 | * is represented by zero, the top middle one etc), but we want |
| 1951 | * to store them '1' based. |
| 1952 | * This is to allow us to migrate the calling code to use this |
| 1953 | * convention. It also solves a nasty problem whereby scrypt ignores |
| 1954 | * trailing zeros, so patterns ending at the top left could be |
| 1955 | * truncated, and similarly, you could add the top left to any |
| 1956 | * pattern and still match. |
| 1957 | * adjust_passwd is a hack function that returns the alternate representation |
| 1958 | * if the password appears to be a pattern (hex numbers all less than 09) |
| 1959 | * If it succeeds we need to try both, and in particular try the alternate |
| 1960 | * first. If the original matches, then we need to update the footer |
| 1961 | * with the alternate. |
| 1962 | * All code that accepts passwords must adjust them first. Since |
| 1963 | * cryptfs_check_passwd is always the first function called after a migration |
| 1964 | * (and indeed on any boot) we only need to do the double try in this |
| 1965 | * function. |
| 1966 | */ |
| 1967 | char* adjust_passwd(const char* passwd) |
| 1968 | { |
| 1969 | size_t index, length; |
| 1970 | |
| 1971 | if (!passwd) { |
| 1972 | return 0; |
| 1973 | } |
| 1974 | |
| 1975 | // Check even length. Hex encoded passwords are always |
| 1976 | // an even length, since each character encodes to two characters. |
| 1977 | length = strlen(passwd); |
| 1978 | if (length % 2) { |
| 1979 | printf("Password not correctly hex encoded."); |
| 1980 | return 0; |
| 1981 | } |
| 1982 | |
| 1983 | // Check password is old-style pattern - a collection of hex |
| 1984 | // encoded bytes less than 9 (00 through 08) |
| 1985 | for (index = 0; index < length; index +=2) { |
| 1986 | if (passwd[index] != '0' |
| 1987 | || passwd[index + 1] < '0' || passwd[index + 1] > '8') { |
| 1988 | return 0; |
| 1989 | } |
| 1990 | } |
| 1991 | |
| 1992 | // Allocate room for adjusted passwd and null terminate |
| 1993 | char* adjusted = malloc(length + 1); |
| 1994 | adjusted[length] = 0; |
| 1995 | |
| 1996 | // Add 0x31 ('1') to each character |
| 1997 | for (index = 0; index < length; index += 2) { |
| 1998 | // output is 31 through 39 so set first byte to three, second to src + 1 |
| 1999 | adjusted[index] = '3'; |
| 2000 | adjusted[index + 1] = passwd[index + 1] + 1; |
| 2001 | } |
| 2002 | |
| 2003 | return adjusted; |
| 2004 | } |
| 2005 | |
| 2006 | /* |
| 2007 | * Passwords in L get passed from Android to cryptfs in hex, so a '1' |
| 2008 | * gets converted to '31' where 31 is 0x31 which is the ascii character |
| 2009 | * code in hex of the character '1'. This function will convert the |
| 2010 | * regular character codes to their hexadecimal representation to make |
| 2011 | * decrypt work properly with Android 5.0 lollipop decryption. |
| 2012 | */ |
| 2013 | char* hexadj_passwd(const char* passwd) |
| 2014 | { |
| 2015 | size_t index, length; |
| 2016 | char* ptr = passwd; |
| 2017 | |
| 2018 | if (!passwd) { |
| 2019 | return 0; |
| 2020 | } |
| 2021 | |
| 2022 | length = strlen(passwd); |
| 2023 | |
| 2024 | // Allocate room for hex passwd and null terminate |
| 2025 | char* hex = malloc((length * 2) + 1); |
| 2026 | hex[length * 2] = 0; |
| 2027 | |
| 2028 | // Convert to hex |
| 2029 | for (index = 0; index < length; index++) { |
| 2030 | sprintf(hex + (index * 2), "%02X", *ptr); |
| 2031 | ptr++; |
| 2032 | } |
| 2033 | |
| 2034 | return hex; |
| 2035 | } |
| 2036 | |
| 2037 | #define FSTAB_PREFIX "/fstab." |
| 2038 | |
| 2039 | int cryptfs_check_footer(void) |
| 2040 | { |
| 2041 | int rc = -1; |
| 2042 | char fstab_filename[PROPERTY_VALUE_MAX + sizeof(FSTAB_PREFIX)]; |
| 2043 | char propbuf[PROPERTY_VALUE_MAX]; |
| 2044 | struct crypt_mnt_ftr crypt_ftr; |
| 2045 | |
| 2046 | property_get("ro.hardware", propbuf, ""); |
| 2047 | snprintf(fstab_filename, sizeof(fstab_filename), FSTAB_PREFIX"%s", propbuf); |
| 2048 | |
| 2049 | fstab = fs_mgr_read_fstab(fstab_filename); |
| 2050 | if (!fstab) { |
| 2051 | printf("failed to open %s\n", fstab_filename); |
| 2052 | return -1; |
| 2053 | } |
| 2054 | |
| 2055 | rc = get_crypt_ftr_and_key(&crypt_ftr); |
| 2056 | |
| 2057 | return rc; |
| 2058 | } |
| 2059 | |
| 2060 | int cryptfs_check_passwd(char *passwd) |
| 2061 | { |
| 2062 | struct crypt_mnt_ftr crypt_ftr; |
| 2063 | int rc; |
| 2064 | char fstab_filename[PROPERTY_VALUE_MAX + sizeof(FSTAB_PREFIX)]; |
| 2065 | char propbuf[PROPERTY_VALUE_MAX]; |
| 2066 | |
| 2067 | property_get("ro.hardware", propbuf, ""); |
| 2068 | snprintf(fstab_filename, sizeof(fstab_filename), FSTAB_PREFIX"%s", propbuf); |
| 2069 | |
| 2070 | fstab = fs_mgr_read_fstab(fstab_filename); |
| 2071 | if (!fstab) { |
| 2072 | printf("failed to open %s\n", fstab_filename); |
| 2073 | return -1; |
| 2074 | } |
| 2075 | |
| 2076 | rc = check_unmounted_and_get_ftr(&crypt_ftr); |
| 2077 | if (rc) |
| 2078 | return rc; |
| 2079 | |
| 2080 | char* adjusted_passwd = adjust_passwd(passwd); |
| 2081 | char* hex_passwd = hexadj_passwd(passwd); |
| 2082 | |
| 2083 | if (adjusted_passwd) { |
| 2084 | int failed_decrypt_count = crypt_ftr.failed_decrypt_count; |
| 2085 | rc = test_mount_encrypted_fs(&crypt_ftr, adjusted_passwd, |
| 2086 | DATA_MNT_POINT, "userdata"); |
| 2087 | |
| 2088 | // Maybe the original one still works? |
| 2089 | if (rc) { |
| 2090 | // Don't double count this failure |
| 2091 | crypt_ftr.failed_decrypt_count = failed_decrypt_count; |
| 2092 | rc = test_mount_encrypted_fs(&crypt_ftr, passwd, |
| 2093 | DATA_MNT_POINT, "userdata"); |
| 2094 | if (!rc) { |
| 2095 | // cryptfs_changepw also adjusts so pass original |
| 2096 | // Note that adjust_passwd only recognises patterns |
| 2097 | // so we can safely use CRYPT_TYPE_PATTERN |
| 2098 | printf("TWRP NOT Updating pattern to new format"); |
| 2099 | //cryptfs_changepw(CRYPT_TYPE_PATTERN, passwd); |
| 2100 | } else if (hex_passwd) { |
| 2101 | rc = test_mount_encrypted_fs(&crypt_ftr, hex_passwd, |
| 2102 | DATA_MNT_POINT, "userdata"); |
| 2103 | } |
| 2104 | } |
| 2105 | free(adjusted_passwd); |
| 2106 | } else { |
| 2107 | rc = test_mount_encrypted_fs(&crypt_ftr, passwd, |
| 2108 | DATA_MNT_POINT, "userdata"); |
| 2109 | if (rc && hex_passwd) { |
| 2110 | rc = test_mount_encrypted_fs(&crypt_ftr, hex_passwd, |
| 2111 | DATA_MNT_POINT, "userdata"); |
| 2112 | } |
| 2113 | } |
| 2114 | |
| 2115 | if (hex_passwd) |
| 2116 | free(hex_passwd); |
| 2117 | |
| 2118 | /*if (rc == 0 && crypt_ftr.crypt_type != CRYPT_TYPE_DEFAULT) { |
| 2119 | printf("cryptfs_check_passwd update expiry time?\n"); |
| 2120 | cryptfs_clear_password(); |
| 2121 | password = strdup(passwd); |
| 2122 | struct timespec now; |
| 2123 | clock_gettime(CLOCK_BOOTTIME, &now); |
| 2124 | password_expiry_time = now.tv_sec + password_max_age_seconds; |
| 2125 | }*/ |
| 2126 | |
| 2127 | return rc; |
| 2128 | } |
| 2129 | |
| 2130 | int cryptfs_verify_passwd(char *passwd) |
| 2131 | { |
| 2132 | struct crypt_mnt_ftr crypt_ftr; |
| 2133 | /* Allocate enough space for a 256 bit key, but we may use less */ |
| 2134 | unsigned char decrypted_master_key[32]; |
| 2135 | char encrypted_state[PROPERTY_VALUE_MAX]; |
| 2136 | int rc; |
| 2137 | |
| 2138 | property_get("ro.crypto.state", encrypted_state, ""); |
| 2139 | if (strcmp(encrypted_state, "encrypted") ) { |
| 2140 | printf("device not encrypted, aborting"); |
| 2141 | return -2; |
| 2142 | } |
| 2143 | |
| 2144 | if (!master_key_saved) { |
| 2145 | printf("encrypted fs not yet mounted, aborting"); |
| 2146 | return -1; |
| 2147 | } |
| 2148 | |
| 2149 | if (!saved_mount_point) { |
| 2150 | printf("encrypted fs failed to save mount point, aborting"); |
| 2151 | return -1; |
| 2152 | } |
| 2153 | |
| 2154 | if (get_crypt_ftr_and_key(&crypt_ftr)) { |
| 2155 | printf("Error getting crypt footer and key\n"); |
| 2156 | return -1; |
| 2157 | } |
| 2158 | |
| 2159 | if (crypt_ftr.flags & CRYPT_MNT_KEY_UNENCRYPTED) { |
| 2160 | /* If the device has no password, then just say the password is valid */ |
| 2161 | rc = 0; |
| 2162 | } else { |
| 2163 | char* adjusted_passwd = adjust_passwd(passwd); |
| 2164 | if (adjusted_passwd) { |
| 2165 | passwd = adjusted_passwd; |
| 2166 | } |
| 2167 | |
| 2168 | decrypt_master_key(passwd, decrypted_master_key, &crypt_ftr, 0, 0); |
| 2169 | if (!memcmp(decrypted_master_key, saved_master_key, crypt_ftr.keysize)) { |
| 2170 | /* They match, the password is correct */ |
| 2171 | rc = 0; |
| 2172 | } else { |
| 2173 | /* If incorrect, sleep for a bit to prevent dictionary attacks */ |
| 2174 | sleep(1); |
| 2175 | rc = 1; |
| 2176 | } |
| 2177 | |
| 2178 | free(adjusted_passwd); |
| 2179 | } |
| 2180 | |
| 2181 | return rc; |
| 2182 | } |
| 2183 | |
| 2184 | /* Initialize a crypt_mnt_ftr structure. The keysize is |
| 2185 | * defaulted to 16 bytes, and the filesystem size to 0. |
| 2186 | * Presumably, at a minimum, the caller will update the |
| 2187 | * filesystem size and crypto_type_name after calling this function. |
| 2188 | */ |
| 2189 | static int cryptfs_init_crypt_mnt_ftr(struct crypt_mnt_ftr *ftr) |
| 2190 | { |
| 2191 | off64_t off; |
| 2192 | |
| 2193 | memset(ftr, 0, sizeof(struct crypt_mnt_ftr)); |
| 2194 | ftr->magic = CRYPT_MNT_MAGIC; |
| 2195 | ftr->major_version = CURRENT_MAJOR_VERSION; |
| 2196 | ftr->minor_version = CURRENT_MINOR_VERSION; |
| 2197 | ftr->ftr_size = sizeof(struct crypt_mnt_ftr); |
| 2198 | ftr->keysize = KEY_LEN_BYTES; |
| 2199 | |
| 2200 | switch (keymaster_check_compatibility()) { |
| 2201 | case 1: |
| 2202 | ftr->kdf_type = KDF_SCRYPT_KEYMASTER; |
| 2203 | break; |
| 2204 | |
| 2205 | case 0: |
| 2206 | ftr->kdf_type = KDF_SCRYPT; |
| 2207 | break; |
| 2208 | |
| 2209 | default: |
| 2210 | printf("keymaster_check_compatibility failed"); |
| 2211 | return -1; |
| 2212 | } |
| 2213 | |
| 2214 | get_device_scrypt_params(ftr); |
| 2215 | |
| 2216 | ftr->persist_data_size = CRYPT_PERSIST_DATA_SIZE; |
| 2217 | if (get_crypt_ftr_info(NULL, &off) == 0) { |
| 2218 | ftr->persist_data_offset[0] = off + CRYPT_FOOTER_TO_PERSIST_OFFSET; |
| 2219 | ftr->persist_data_offset[1] = off + CRYPT_FOOTER_TO_PERSIST_OFFSET + |
| 2220 | ftr->persist_data_size; |
| 2221 | } |
| 2222 | |
| 2223 | return 0; |
| 2224 | } |
| 2225 | |
| 2226 | static int cryptfs_enable_wipe(char *crypto_blkdev, off64_t size, int type) |
| 2227 | { |
| 2228 | const char *args[10]; |
| 2229 | char size_str[32]; /* Must be large enough to hold a %lld and null byte */ |
| 2230 | int num_args; |
| 2231 | int status; |
| 2232 | int tmp; |
| 2233 | int rc = -1; |
| 2234 | |
| 2235 | if (type == EXT4_FS) { |
| 2236 | args[0] = "/system/bin/make_ext4fs"; |
| 2237 | args[1] = "-a"; |
| 2238 | args[2] = "/data"; |
| 2239 | args[3] = "-l"; |
| 2240 | snprintf(size_str, sizeof(size_str), "%" PRId64, size * 512); |
| 2241 | args[4] = size_str; |
| 2242 | args[5] = crypto_blkdev; |
| 2243 | num_args = 6; |
| 2244 | printf("Making empty filesystem with command %s %s %s %s %s %s\n", |
| 2245 | args[0], args[1], args[2], args[3], args[4], args[5]); |
| 2246 | } else if (type == F2FS_FS) { |
| 2247 | args[0] = "/system/bin/mkfs.f2fs"; |
| 2248 | args[1] = "-t"; |
| 2249 | args[2] = "-d1"; |
| 2250 | args[3] = crypto_blkdev; |
| 2251 | snprintf(size_str, sizeof(size_str), "%" PRId64, size); |
| 2252 | args[4] = size_str; |
| 2253 | num_args = 5; |
| 2254 | printf("Making empty filesystem with command %s %s %s %s %s\n", |
| 2255 | args[0], args[1], args[2], args[3], args[4]); |
| 2256 | } else { |
| 2257 | printf("cryptfs_enable_wipe(): unknown filesystem type %d\n", type); |
| 2258 | return -1; |
| 2259 | } |
| 2260 | |
| 2261 | tmp = android_fork_execvp(num_args, (char **)args, &status, false, true); |
| 2262 | |
| 2263 | if (tmp != 0) { |
| 2264 | printf("Error creating empty filesystem on %s due to logwrap error\n", crypto_blkdev); |
| 2265 | } else { |
| 2266 | if (WIFEXITED(status)) { |
| 2267 | if (WEXITSTATUS(status)) { |
| 2268 | printf("Error creating filesystem on %s, exit status %d ", |
| 2269 | crypto_blkdev, WEXITSTATUS(status)); |
| 2270 | } else { |
| 2271 | printf("Successfully created filesystem on %s\n", crypto_blkdev); |
| 2272 | rc = 0; |
| 2273 | } |
| 2274 | } else { |
| 2275 | printf("Error creating filesystem on %s, did not exit normally\n", crypto_blkdev); |
| 2276 | } |
| 2277 | } |
| 2278 | |
| 2279 | return rc; |
| 2280 | } |
| 2281 | |
| 2282 | #define CRYPT_INPLACE_BUFSIZE 4096 |
| 2283 | #define CRYPT_SECTORS_PER_BUFSIZE (CRYPT_INPLACE_BUFSIZE / CRYPT_SECTOR_SIZE) |
| 2284 | #define CRYPT_SECTOR_SIZE 512 |
| 2285 | |
| 2286 | /* aligned 32K writes tends to make flash happy. |
| 2287 | * SD card association recommends it. |
| 2288 | */ |
| 2289 | #define BLOCKS_AT_A_TIME 8 |
| 2290 | |
| 2291 | struct encryptGroupsData |
| 2292 | { |
| 2293 | int realfd; |
| 2294 | int cryptofd; |
| 2295 | off64_t numblocks; |
| 2296 | off64_t one_pct, cur_pct, new_pct; |
| 2297 | off64_t blocks_already_done, tot_numblocks; |
| 2298 | off64_t used_blocks_already_done, tot_used_blocks; |
| 2299 | char* real_blkdev, * crypto_blkdev; |
| 2300 | int count; |
| 2301 | off64_t offset; |
| 2302 | char* buffer; |
| 2303 | off64_t last_written_sector; |
| 2304 | int completed; |
| 2305 | time_t time_started; |
| 2306 | int remaining_time; |
| 2307 | }; |
| 2308 | |
| 2309 | static void update_progress(struct encryptGroupsData* data, int is_used) |
| 2310 | { |
| 2311 | data->blocks_already_done++; |
| 2312 | |
| 2313 | if (is_used) { |
| 2314 | data->used_blocks_already_done++; |
| 2315 | } |
| 2316 | if (data->tot_used_blocks) { |
| 2317 | data->new_pct = data->used_blocks_already_done / data->one_pct; |
| 2318 | } else { |
| 2319 | data->new_pct = data->blocks_already_done / data->one_pct; |
| 2320 | } |
| 2321 | |
| 2322 | if (data->new_pct > data->cur_pct) { |
| 2323 | char buf[8]; |
| 2324 | data->cur_pct = data->new_pct; |
| 2325 | snprintf(buf, sizeof(buf), "%" PRId64, data->cur_pct); |
| 2326 | property_set("vold.encrypt_progress", buf); |
| 2327 | } |
| 2328 | |
| 2329 | if (data->cur_pct >= 5) { |
| 2330 | struct timespec time_now; |
| 2331 | if (clock_gettime(CLOCK_MONOTONIC, &time_now)) { |
| 2332 | printf("Error getting time"); |
| 2333 | } else { |
| 2334 | double elapsed_time = difftime(time_now.tv_sec, data->time_started); |
| 2335 | off64_t remaining_blocks = data->tot_used_blocks |
| 2336 | - data->used_blocks_already_done; |
| 2337 | int remaining_time = (int)(elapsed_time * remaining_blocks |
| 2338 | / data->used_blocks_already_done); |
| 2339 | |
| 2340 | // Change time only if not yet set, lower, or a lot higher for |
| 2341 | // best user experience |
| 2342 | if (data->remaining_time == -1 |
| 2343 | || remaining_time < data->remaining_time |
| 2344 | || remaining_time > data->remaining_time + 60) { |
| 2345 | char buf[8]; |
| 2346 | snprintf(buf, sizeof(buf), "%d", remaining_time); |
| 2347 | property_set("vold.encrypt_time_remaining", buf); |
| 2348 | data->remaining_time = remaining_time; |
| 2349 | } |
| 2350 | } |
| 2351 | } |
| 2352 | } |
| 2353 | |
| 2354 | static void log_progress(struct encryptGroupsData const* data, bool completed) |
| 2355 | { |
| 2356 | // Precondition - if completed data = 0 else data != 0 |
| 2357 | |
| 2358 | // Track progress so we can skip logging blocks |
| 2359 | static off64_t offset = -1; |
| 2360 | |
| 2361 | // Need to close existing 'Encrypting from' log? |
| 2362 | if (completed || (offset != -1 && data->offset != offset)) { |
| 2363 | printf("Encrypted to sector %" PRId64, |
| 2364 | offset / info.block_size * CRYPT_SECTOR_SIZE); |
| 2365 | offset = -1; |
| 2366 | } |
| 2367 | |
| 2368 | // Need to start new 'Encrypting from' log? |
| 2369 | if (!completed && offset != data->offset) { |
| 2370 | printf("Encrypting from sector %" PRId64, |
| 2371 | data->offset / info.block_size * CRYPT_SECTOR_SIZE); |
| 2372 | } |
| 2373 | |
| 2374 | // Update offset |
| 2375 | if (!completed) { |
| 2376 | offset = data->offset + (off64_t)data->count * info.block_size; |
| 2377 | } |
| 2378 | } |
| 2379 | |
| 2380 | static int flush_outstanding_data(struct encryptGroupsData* data) |
| 2381 | { |
| 2382 | if (data->count == 0) { |
| 2383 | return 0; |
| 2384 | } |
| 2385 | |
| 2386 | printf("Copying %d blocks at offset %" PRIx64, data->count, data->offset); |
| 2387 | |
| 2388 | if (pread64(data->realfd, data->buffer, |
| 2389 | info.block_size * data->count, data->offset) |
| 2390 | <= 0) { |
| 2391 | printf("Error reading real_blkdev %s for inplace encrypt", |
| 2392 | data->real_blkdev); |
| 2393 | return -1; |
| 2394 | } |
| 2395 | |
| 2396 | if (pwrite64(data->cryptofd, data->buffer, |
| 2397 | info.block_size * data->count, data->offset) |
| 2398 | <= 0) { |
| 2399 | printf("Error writing crypto_blkdev %s for inplace encrypt", |
| 2400 | data->crypto_blkdev); |
| 2401 | return -1; |
| 2402 | } else { |
| 2403 | log_progress(data, false); |
| 2404 | } |
| 2405 | |
| 2406 | data->count = 0; |
| 2407 | data->last_written_sector = (data->offset + data->count) |
| 2408 | / info.block_size * CRYPT_SECTOR_SIZE - 1; |
| 2409 | return 0; |
| 2410 | } |
| 2411 | |
| 2412 | static int encrypt_groups(struct encryptGroupsData* data) |
| 2413 | { |
| 2414 | unsigned int i; |
| 2415 | u8 *block_bitmap = 0; |
| 2416 | unsigned int block; |
| 2417 | off64_t ret; |
| 2418 | int rc = -1; |
| 2419 | |
| 2420 | data->buffer = malloc(info.block_size * BLOCKS_AT_A_TIME); |
| 2421 | if (!data->buffer) { |
| 2422 | printf("Failed to allocate crypto buffer"); |
| 2423 | goto errout; |
| 2424 | } |
| 2425 | |
| 2426 | block_bitmap = malloc(info.block_size); |
| 2427 | if (!block_bitmap) { |
| 2428 | printf("failed to allocate block bitmap"); |
| 2429 | goto errout; |
| 2430 | } |
| 2431 | |
| 2432 | for (i = 0; i < aux_info.groups; ++i) { |
| 2433 | printf("Encrypting group %d", i); |
| 2434 | |
| 2435 | u32 first_block = aux_info.first_data_block + i * info.blocks_per_group; |
| 2436 | u32 block_count = min(info.blocks_per_group, |
| 2437 | aux_info.len_blocks - first_block); |
| 2438 | |
| 2439 | off64_t offset = (u64)info.block_size |
| 2440 | * aux_info.bg_desc[i].bg_block_bitmap; |
| 2441 | |
| 2442 | ret = pread64(data->realfd, block_bitmap, info.block_size, offset); |
| 2443 | if (ret != (int)info.block_size) { |
| 2444 | printf("failed to read all of block group bitmap %d", i); |
| 2445 | goto errout; |
| 2446 | } |
| 2447 | |
| 2448 | offset = (u64)info.block_size * first_block; |
| 2449 | |
| 2450 | data->count = 0; |
| 2451 | |
| 2452 | for (block = 0; block < block_count; block++) { |
| 2453 | int used = bitmap_get_bit(block_bitmap, block); |
| 2454 | update_progress(data, used); |
| 2455 | if (used) { |
| 2456 | if (data->count == 0) { |
| 2457 | data->offset = offset; |
| 2458 | } |
| 2459 | data->count++; |
| 2460 | } else { |
| 2461 | if (flush_outstanding_data(data)) { |
| 2462 | goto errout; |
| 2463 | } |
| 2464 | } |
| 2465 | |
| 2466 | offset += info.block_size; |
| 2467 | |
| 2468 | /* Write data if we are aligned or buffer size reached */ |
| 2469 | if (offset % (info.block_size * BLOCKS_AT_A_TIME) == 0 |
| 2470 | || data->count == BLOCKS_AT_A_TIME) { |
| 2471 | if (flush_outstanding_data(data)) { |
| 2472 | goto errout; |
| 2473 | } |
| 2474 | } |
| 2475 | |
| 2476 | if (1) { |
| 2477 | printf("Stopping encryption due to low battery"); |
| 2478 | rc = 0; |
| 2479 | goto errout; |
| 2480 | } |
| 2481 | |
| 2482 | } |
| 2483 | if (flush_outstanding_data(data)) { |
| 2484 | goto errout; |
| 2485 | } |
| 2486 | } |
| 2487 | |
| 2488 | data->completed = 1; |
| 2489 | rc = 0; |
| 2490 | |
| 2491 | errout: |
| 2492 | log_progress(0, true); |
| 2493 | free(data->buffer); |
| 2494 | free(block_bitmap); |
| 2495 | return rc; |
| 2496 | } |
| 2497 | |
| 2498 | static int cryptfs_enable_inplace_ext4(char *crypto_blkdev, |
| 2499 | char *real_blkdev, |
| 2500 | off64_t size, |
| 2501 | off64_t *size_already_done, |
| 2502 | off64_t tot_size, |
| 2503 | off64_t previously_encrypted_upto) |
| 2504 | { |
| 2505 | u32 i; |
| 2506 | struct encryptGroupsData data; |
| 2507 | int rc; // Can't initialize without causing warning -Wclobbered |
| 2508 | |
| 2509 | if (previously_encrypted_upto > *size_already_done) { |
| 2510 | printf("Not fast encrypting since resuming part way through"); |
| 2511 | return -1; |
| 2512 | } |
| 2513 | |
| 2514 | memset(&data, 0, sizeof(data)); |
| 2515 | data.real_blkdev = real_blkdev; |
| 2516 | data.crypto_blkdev = crypto_blkdev; |
| 2517 | |
| 2518 | if ( (data.realfd = open(real_blkdev, O_RDWR)) < 0) { |
| 2519 | printf("Error opening real_blkdev %s for inplace encrypt. err=%d(%s)\n", |
| 2520 | real_blkdev, errno, strerror(errno)); |
| 2521 | rc = -1; |
| 2522 | goto errout; |
| 2523 | } |
| 2524 | |
| 2525 | if ( (data.cryptofd = open(crypto_blkdev, O_WRONLY)) < 0) { |
| 2526 | printf("Error opening crypto_blkdev %s for ext4 inplace encrypt. err=%d(%s)\n", |
| 2527 | crypto_blkdev, errno, strerror(errno)); |
| 2528 | rc = ENABLE_INPLACE_ERR_DEV; |
| 2529 | goto errout; |
| 2530 | } |
| 2531 | |
| 2532 | if (setjmp(setjmp_env)) { |
| 2533 | printf("Reading ext4 extent caused an exception\n"); |
| 2534 | rc = -1; |
| 2535 | goto errout; |
| 2536 | } |
| 2537 | |
| 2538 | if (read_ext(data.realfd, 0) != 0) { |
| 2539 | printf("Failed to read ext4 extent\n"); |
| 2540 | rc = -1; |
| 2541 | goto errout; |
| 2542 | } |
| 2543 | |
| 2544 | data.numblocks = size / CRYPT_SECTORS_PER_BUFSIZE; |
| 2545 | data.tot_numblocks = tot_size / CRYPT_SECTORS_PER_BUFSIZE; |
| 2546 | data.blocks_already_done = *size_already_done / CRYPT_SECTORS_PER_BUFSIZE; |
| 2547 | |
| 2548 | printf("Encrypting ext4 filesystem in place..."); |
| 2549 | |
| 2550 | data.tot_used_blocks = data.numblocks; |
| 2551 | for (i = 0; i < aux_info.groups; ++i) { |
| 2552 | data.tot_used_blocks -= aux_info.bg_desc[i].bg_free_blocks_count; |
| 2553 | } |
| 2554 | |
| 2555 | data.one_pct = data.tot_used_blocks / 100; |
| 2556 | data.cur_pct = 0; |
| 2557 | |
| 2558 | struct timespec time_started = {0}; |
| 2559 | if (clock_gettime(CLOCK_MONOTONIC, &time_started)) { |
| 2560 | printf("Error getting time at start"); |
| 2561 | // Note - continue anyway - we'll run with 0 |
| 2562 | } |
| 2563 | data.time_started = time_started.tv_sec; |
| 2564 | data.remaining_time = -1; |
| 2565 | |
| 2566 | rc = encrypt_groups(&data); |
| 2567 | if (rc) { |
| 2568 | printf("Error encrypting groups"); |
| 2569 | goto errout; |
| 2570 | } |
| 2571 | |
| 2572 | *size_already_done += data.completed ? size : data.last_written_sector; |
| 2573 | rc = 0; |
| 2574 | |
| 2575 | errout: |
| 2576 | close(data.realfd); |
| 2577 | close(data.cryptofd); |
| 2578 | |
| 2579 | return rc; |
| 2580 | } |
| 2581 | |
| 2582 | static void log_progress_f2fs(u64 block, bool completed) |
| 2583 | { |
| 2584 | // Precondition - if completed data = 0 else data != 0 |
| 2585 | |
| 2586 | // Track progress so we can skip logging blocks |
| 2587 | static u64 last_block = (u64)-1; |
| 2588 | |
| 2589 | // Need to close existing 'Encrypting from' log? |
| 2590 | if (completed || (last_block != (u64)-1 && block != last_block + 1)) { |
| 2591 | printf("Encrypted to block %" PRId64, last_block); |
| 2592 | last_block = -1; |
| 2593 | } |
| 2594 | |
| 2595 | // Need to start new 'Encrypting from' log? |
| 2596 | if (!completed && (last_block == (u64)-1 || block != last_block + 1)) { |
| 2597 | printf("Encrypting from block %" PRId64, block); |
| 2598 | } |
| 2599 | |
| 2600 | // Update offset |
| 2601 | if (!completed) { |
| 2602 | last_block = block; |
| 2603 | } |
| 2604 | } |
| 2605 | |
| 2606 | static int encrypt_one_block_f2fs(u64 pos, void *data) |
| 2607 | { |
| 2608 | struct encryptGroupsData *priv_dat = (struct encryptGroupsData *)data; |
| 2609 | |
| 2610 | priv_dat->blocks_already_done = pos - 1; |
| 2611 | update_progress(priv_dat, 1); |
| 2612 | |
| 2613 | off64_t offset = pos * CRYPT_INPLACE_BUFSIZE; |
| 2614 | |
| 2615 | if (pread64(priv_dat->realfd, priv_dat->buffer, CRYPT_INPLACE_BUFSIZE, offset) <= 0) { |
| 2616 | printf("Error reading real_blkdev %s for f2fs inplace encrypt", priv_dat->crypto_blkdev); |
| 2617 | return -1; |
| 2618 | } |
| 2619 | |
| 2620 | if (pwrite64(priv_dat->cryptofd, priv_dat->buffer, CRYPT_INPLACE_BUFSIZE, offset) <= 0) { |
| 2621 | printf("Error writing crypto_blkdev %s for f2fs inplace encrypt", priv_dat->crypto_blkdev); |
| 2622 | return -1; |
| 2623 | } else { |
| 2624 | log_progress_f2fs(pos, false); |
| 2625 | } |
| 2626 | |
| 2627 | return 0; |
| 2628 | } |
| 2629 | |
| 2630 | static int cryptfs_enable_inplace_f2fs(char *crypto_blkdev, |
| 2631 | char *real_blkdev, |
| 2632 | off64_t size, |
| 2633 | off64_t *size_already_done, |
| 2634 | off64_t tot_size, |
| 2635 | off64_t previously_encrypted_upto) |
| 2636 | { |
| 2637 | u32 i; |
| 2638 | struct encryptGroupsData data; |
| 2639 | struct f2fs_info *f2fs_info = NULL; |
| 2640 | int rc = ENABLE_INPLACE_ERR_OTHER; |
| 2641 | if (previously_encrypted_upto > *size_already_done) { |
| 2642 | printf("Not fast encrypting since resuming part way through"); |
| 2643 | return ENABLE_INPLACE_ERR_OTHER; |
| 2644 | } |
| 2645 | memset(&data, 0, sizeof(data)); |
| 2646 | data.real_blkdev = real_blkdev; |
| 2647 | data.crypto_blkdev = crypto_blkdev; |
| 2648 | data.realfd = -1; |
| 2649 | data.cryptofd = -1; |
| 2650 | if ( (data.realfd = open64(real_blkdev, O_RDWR)) < 0) { |
| 2651 | printf("Error opening real_blkdev %s for f2fs inplace encrypt\n", |
| 2652 | real_blkdev); |
| 2653 | goto errout; |
| 2654 | } |
| 2655 | if ( (data.cryptofd = open64(crypto_blkdev, O_WRONLY)) < 0) { |
| 2656 | printf("Error opening crypto_blkdev %s for f2fs inplace encrypt. err=%d(%s)\n", |
| 2657 | crypto_blkdev, errno, strerror(errno)); |
| 2658 | rc = ENABLE_INPLACE_ERR_DEV; |
| 2659 | goto errout; |
| 2660 | } |
| 2661 | |
| 2662 | f2fs_info = generate_f2fs_info(data.realfd); |
| 2663 | if (!f2fs_info) |
| 2664 | goto errout; |
| 2665 | |
| 2666 | data.numblocks = size / CRYPT_SECTORS_PER_BUFSIZE; |
| 2667 | data.tot_numblocks = tot_size / CRYPT_SECTORS_PER_BUFSIZE; |
| 2668 | data.blocks_already_done = *size_already_done / CRYPT_SECTORS_PER_BUFSIZE; |
| 2669 | |
| 2670 | data.tot_used_blocks = get_num_blocks_used(f2fs_info); |
| 2671 | |
| 2672 | data.one_pct = data.tot_used_blocks / 100; |
| 2673 | data.cur_pct = 0; |
| 2674 | data.time_started = time(NULL); |
| 2675 | data.remaining_time = -1; |
| 2676 | |
| 2677 | data.buffer = malloc(f2fs_info->block_size); |
| 2678 | if (!data.buffer) { |
| 2679 | printf("Failed to allocate crypto buffer"); |
| 2680 | goto errout; |
| 2681 | } |
| 2682 | |
| 2683 | data.count = 0; |
| 2684 | |
| 2685 | /* Currently, this either runs to completion, or hits a nonrecoverable error */ |
| 2686 | rc = run_on_used_blocks(data.blocks_already_done, f2fs_info, &encrypt_one_block_f2fs, &data); |
| 2687 | |
| 2688 | if (rc) { |
| 2689 | printf("Error in running over f2fs blocks"); |
| 2690 | rc = ENABLE_INPLACE_ERR_OTHER; |
| 2691 | goto errout; |
| 2692 | } |
| 2693 | |
| 2694 | *size_already_done += size; |
| 2695 | rc = 0; |
| 2696 | |
| 2697 | errout: |
| 2698 | if (rc) |
| 2699 | printf("Failed to encrypt f2fs filesystem on %s", real_blkdev); |
| 2700 | |
| 2701 | log_progress_f2fs(0, true); |
| 2702 | free(f2fs_info); |
| 2703 | free(data.buffer); |
| 2704 | close(data.realfd); |
| 2705 | close(data.cryptofd); |
| 2706 | |
| 2707 | return rc; |
| 2708 | } |
| 2709 | |
| 2710 | static int cryptfs_enable_inplace_full(char *crypto_blkdev, char *real_blkdev, |
| 2711 | off64_t size, off64_t *size_already_done, |
| 2712 | off64_t tot_size, |
| 2713 | off64_t previously_encrypted_upto) |
| 2714 | { |
| 2715 | int realfd, cryptofd; |
| 2716 | char *buf[CRYPT_INPLACE_BUFSIZE]; |
| 2717 | int rc = ENABLE_INPLACE_ERR_OTHER; |
| 2718 | off64_t numblocks, i, remainder; |
| 2719 | off64_t one_pct, cur_pct, new_pct; |
| 2720 | off64_t blocks_already_done, tot_numblocks; |
| 2721 | |
| 2722 | if ( (realfd = open(real_blkdev, O_RDONLY)) < 0) { |
| 2723 | printf("Error opening real_blkdev %s for inplace encrypt\n", real_blkdev); |
| 2724 | return ENABLE_INPLACE_ERR_OTHER; |
| 2725 | } |
| 2726 | |
| 2727 | if ( (cryptofd = open(crypto_blkdev, O_WRONLY)) < 0) { |
| 2728 | printf("Error opening crypto_blkdev %s for inplace encrypt. err=%d(%s)\n", |
| 2729 | crypto_blkdev, errno, strerror(errno)); |
| 2730 | close(realfd); |
| 2731 | return ENABLE_INPLACE_ERR_DEV; |
| 2732 | } |
| 2733 | |
| 2734 | /* This is pretty much a simple loop of reading 4K, and writing 4K. |
| 2735 | * The size passed in is the number of 512 byte sectors in the filesystem. |
| 2736 | * So compute the number of whole 4K blocks we should read/write, |
| 2737 | * and the remainder. |
| 2738 | */ |
| 2739 | numblocks = size / CRYPT_SECTORS_PER_BUFSIZE; |
| 2740 | remainder = size % CRYPT_SECTORS_PER_BUFSIZE; |
| 2741 | tot_numblocks = tot_size / CRYPT_SECTORS_PER_BUFSIZE; |
| 2742 | blocks_already_done = *size_already_done / CRYPT_SECTORS_PER_BUFSIZE; |
| 2743 | |
| 2744 | printf("Encrypting filesystem in place..."); |
| 2745 | |
| 2746 | i = previously_encrypted_upto + 1 - *size_already_done; |
| 2747 | |
| 2748 | if (lseek64(realfd, i * CRYPT_SECTOR_SIZE, SEEK_SET) < 0) { |
| 2749 | printf("Cannot seek to previously encrypted point on %s", real_blkdev); |
| 2750 | goto errout; |
| 2751 | } |
| 2752 | |
| 2753 | if (lseek64(cryptofd, i * CRYPT_SECTOR_SIZE, SEEK_SET) < 0) { |
| 2754 | printf("Cannot seek to previously encrypted point on %s", crypto_blkdev); |
| 2755 | goto errout; |
| 2756 | } |
| 2757 | |
| 2758 | for (;i < size && i % CRYPT_SECTORS_PER_BUFSIZE != 0; ++i) { |
| 2759 | if (unix_read(realfd, buf, CRYPT_SECTOR_SIZE) <= 0) { |
| 2760 | printf("Error reading initial sectors from real_blkdev %s for " |
| 2761 | "inplace encrypt\n", crypto_blkdev); |
| 2762 | goto errout; |
| 2763 | } |
| 2764 | if (unix_write(cryptofd, buf, CRYPT_SECTOR_SIZE) <= 0) { |
| 2765 | printf("Error writing initial sectors to crypto_blkdev %s for " |
| 2766 | "inplace encrypt\n", crypto_blkdev); |
| 2767 | goto errout; |
| 2768 | } else { |
| 2769 | printf("Encrypted 1 block at %" PRId64, i); |
| 2770 | } |
| 2771 | } |
| 2772 | |
| 2773 | one_pct = tot_numblocks / 100; |
| 2774 | cur_pct = 0; |
| 2775 | /* process the majority of the filesyst
|