1 /* 2 * QEMU Crypto block device encryption LUKS format 3 * 4 * Copyright (c) 2015-2016 Red Hat, Inc. 5 * 6 * This library is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU Lesser General Public 8 * License as published by the Free Software Foundation; either 9 * version 2 of the License, or (at your option) any later version. 10 * 11 * This library is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 * Lesser General Public License for more details. 15 * 16 * You should have received a copy of the GNU Lesser General Public 17 * License along with this library; if not, see <http://www.gnu.org/licenses/>. 18 * 19 */ 20 21 #include "qemu/osdep.h" 22 23 #include "crypto/block-luks.h" 24 25 #include "crypto/hash.h" 26 #include "crypto/afsplit.h" 27 #include "crypto/pbkdf.h" 28 #include "crypto/secret.h" 29 #include "crypto/random.h" 30 31 #ifdef CONFIG_UUID 32 #include <uuid/uuid.h> 33 #endif 34 35 #include "qemu/coroutine.h" 36 37 /* 38 * Reference for the LUKS format implemented here is 39 * 40 * docs/on-disk-format.pdf 41 * 42 * in 'cryptsetup' package source code 43 * 44 * This file implements the 1.2.1 specification, dated 45 * Oct 16, 2011. 46 */ 47 48 typedef struct QCryptoBlockLUKS QCryptoBlockLUKS; 49 typedef struct QCryptoBlockLUKSHeader QCryptoBlockLUKSHeader; 50 typedef struct QCryptoBlockLUKSKeySlot QCryptoBlockLUKSKeySlot; 51 52 53 /* The following constants are all defined by the LUKS spec */ 54 #define QCRYPTO_BLOCK_LUKS_VERSION 1 55 56 #define QCRYPTO_BLOCK_LUKS_MAGIC_LEN 6 57 #define QCRYPTO_BLOCK_LUKS_CIPHER_NAME_LEN 32 58 #define QCRYPTO_BLOCK_LUKS_CIPHER_MODE_LEN 32 59 #define QCRYPTO_BLOCK_LUKS_HASH_SPEC_LEN 32 60 #define QCRYPTO_BLOCK_LUKS_DIGEST_LEN 20 61 #define QCRYPTO_BLOCK_LUKS_SALT_LEN 32 62 #define QCRYPTO_BLOCK_LUKS_UUID_LEN 40 63 #define QCRYPTO_BLOCK_LUKS_NUM_KEY_SLOTS 8 64 #define QCRYPTO_BLOCK_LUKS_STRIPES 4000 65 #define QCRYPTO_BLOCK_LUKS_MIN_SLOT_KEY_ITERS 1000 66 #define QCRYPTO_BLOCK_LUKS_MIN_MASTER_KEY_ITERS 1000 67 #define QCRYPTO_BLOCK_LUKS_KEY_SLOT_OFFSET 4096 68 69 #define QCRYPTO_BLOCK_LUKS_KEY_SLOT_DISABLED 0x0000DEAD 70 #define QCRYPTO_BLOCK_LUKS_KEY_SLOT_ENABLED 0x00AC71F3 71 72 #define QCRYPTO_BLOCK_LUKS_SECTOR_SIZE 512LL 73 74 static const char qcrypto_block_luks_magic[QCRYPTO_BLOCK_LUKS_MAGIC_LEN] = { 75 'L', 'U', 'K', 'S', 0xBA, 0xBE 76 }; 77 78 typedef struct QCryptoBlockLUKSNameMap QCryptoBlockLUKSNameMap; 79 struct QCryptoBlockLUKSNameMap { 80 const char *name; 81 int id; 82 }; 83 84 typedef struct QCryptoBlockLUKSCipherSizeMap QCryptoBlockLUKSCipherSizeMap; 85 struct QCryptoBlockLUKSCipherSizeMap { 86 uint32_t key_bytes; 87 int id; 88 }; 89 typedef struct QCryptoBlockLUKSCipherNameMap QCryptoBlockLUKSCipherNameMap; 90 struct QCryptoBlockLUKSCipherNameMap { 91 const char *name; 92 const QCryptoBlockLUKSCipherSizeMap *sizes; 93 }; 94 95 96 static const QCryptoBlockLUKSCipherSizeMap 97 qcrypto_block_luks_cipher_size_map_aes[] = { 98 { 16, QCRYPTO_CIPHER_ALG_AES_128 }, 99 { 24, QCRYPTO_CIPHER_ALG_AES_192 }, 100 { 32, QCRYPTO_CIPHER_ALG_AES_256 }, 101 { 0, 0 }, 102 }; 103 104 static const QCryptoBlockLUKSCipherSizeMap 105 qcrypto_block_luks_cipher_size_map_cast5[] = { 106 { 16, QCRYPTO_CIPHER_ALG_CAST5_128 }, 107 { 0, 0 }, 108 }; 109 110 static const QCryptoBlockLUKSCipherSizeMap 111 qcrypto_block_luks_cipher_size_map_serpent[] = { 112 { 16, QCRYPTO_CIPHER_ALG_SERPENT_128 }, 113 { 24, QCRYPTO_CIPHER_ALG_SERPENT_192 }, 114 { 32, QCRYPTO_CIPHER_ALG_SERPENT_256 }, 115 { 0, 0 }, 116 }; 117 118 static const QCryptoBlockLUKSCipherSizeMap 119 qcrypto_block_luks_cipher_size_map_twofish[] = { 120 { 16, QCRYPTO_CIPHER_ALG_TWOFISH_128 }, 121 { 24, QCRYPTO_CIPHER_ALG_TWOFISH_192 }, 122 { 32, QCRYPTO_CIPHER_ALG_TWOFISH_256 }, 123 { 0, 0 }, 124 }; 125 126 static const QCryptoBlockLUKSCipherNameMap 127 qcrypto_block_luks_cipher_name_map[] = { 128 { "aes", qcrypto_block_luks_cipher_size_map_aes }, 129 { "cast5", qcrypto_block_luks_cipher_size_map_cast5 }, 130 { "serpent", qcrypto_block_luks_cipher_size_map_serpent }, 131 { "twofish", qcrypto_block_luks_cipher_size_map_twofish }, 132 }; 133 134 135 /* 136 * This struct is written to disk in big-endian format, 137 * but operated upon in native-endian format. 138 */ 139 struct QCryptoBlockLUKSKeySlot { 140 /* state of keyslot, enabled/disable */ 141 uint32_t active; 142 /* iterations for PBKDF2 */ 143 uint32_t iterations; 144 /* salt for PBKDF2 */ 145 uint8_t salt[QCRYPTO_BLOCK_LUKS_SALT_LEN]; 146 /* start sector of key material */ 147 uint32_t key_offset; 148 /* number of anti-forensic stripes */ 149 uint32_t stripes; 150 } QEMU_PACKED; 151 152 QEMU_BUILD_BUG_ON(sizeof(struct QCryptoBlockLUKSKeySlot) != 48); 153 154 155 /* 156 * This struct is written to disk in big-endian format, 157 * but operated upon in native-endian format. 158 */ 159 struct QCryptoBlockLUKSHeader { 160 /* 'L', 'U', 'K', 'S', '0xBA', '0xBE' */ 161 char magic[QCRYPTO_BLOCK_LUKS_MAGIC_LEN]; 162 163 /* LUKS version, currently 1 */ 164 uint16_t version; 165 166 /* cipher name specification (aes, etc) */ 167 char cipher_name[QCRYPTO_BLOCK_LUKS_CIPHER_NAME_LEN]; 168 169 /* cipher mode specification (cbc-plain, xts-essiv:sha256, etc) */ 170 char cipher_mode[QCRYPTO_BLOCK_LUKS_CIPHER_MODE_LEN]; 171 172 /* hash specification (sha256, etc) */ 173 char hash_spec[QCRYPTO_BLOCK_LUKS_HASH_SPEC_LEN]; 174 175 /* start offset of the volume data (in 512 byte sectors) */ 176 uint32_t payload_offset; 177 178 /* Number of key bytes */ 179 uint32_t key_bytes; 180 181 /* master key checksum after PBKDF2 */ 182 uint8_t master_key_digest[QCRYPTO_BLOCK_LUKS_DIGEST_LEN]; 183 184 /* salt for master key PBKDF2 */ 185 uint8_t master_key_salt[QCRYPTO_BLOCK_LUKS_SALT_LEN]; 186 187 /* iterations for master key PBKDF2 */ 188 uint32_t master_key_iterations; 189 190 /* UUID of the partition in standard ASCII representation */ 191 uint8_t uuid[QCRYPTO_BLOCK_LUKS_UUID_LEN]; 192 193 /* key slots */ 194 QCryptoBlockLUKSKeySlot key_slots[QCRYPTO_BLOCK_LUKS_NUM_KEY_SLOTS]; 195 } QEMU_PACKED; 196 197 QEMU_BUILD_BUG_ON(sizeof(struct QCryptoBlockLUKSHeader) != 592); 198 199 200 struct QCryptoBlockLUKS { 201 QCryptoBlockLUKSHeader header; 202 }; 203 204 205 static int qcrypto_block_luks_cipher_name_lookup(const char *name, 206 QCryptoCipherMode mode, 207 uint32_t key_bytes, 208 Error **errp) 209 { 210 const QCryptoBlockLUKSCipherNameMap *map = 211 qcrypto_block_luks_cipher_name_map; 212 size_t maplen = G_N_ELEMENTS(qcrypto_block_luks_cipher_name_map); 213 size_t i, j; 214 215 if (mode == QCRYPTO_CIPHER_MODE_XTS) { 216 key_bytes /= 2; 217 } 218 219 for (i = 0; i < maplen; i++) { 220 if (!g_str_equal(map[i].name, name)) { 221 continue; 222 } 223 for (j = 0; j < map[i].sizes[j].key_bytes; j++) { 224 if (map[i].sizes[j].key_bytes == key_bytes) { 225 return map[i].sizes[j].id; 226 } 227 } 228 } 229 230 error_setg(errp, "Algorithm %s with key size %d bytes not supported", 231 name, key_bytes); 232 return 0; 233 } 234 235 static const char * 236 qcrypto_block_luks_cipher_alg_lookup(QCryptoCipherAlgorithm alg, 237 Error **errp) 238 { 239 const QCryptoBlockLUKSCipherNameMap *map = 240 qcrypto_block_luks_cipher_name_map; 241 size_t maplen = G_N_ELEMENTS(qcrypto_block_luks_cipher_name_map); 242 size_t i, j; 243 for (i = 0; i < maplen; i++) { 244 for (j = 0; j < map[i].sizes[j].key_bytes; j++) { 245 if (map[i].sizes[j].id == alg) { 246 return map[i].name; 247 } 248 } 249 } 250 251 error_setg(errp, "Algorithm '%s' not supported", 252 QCryptoCipherAlgorithm_lookup[alg]); 253 return NULL; 254 } 255 256 /* XXX replace with qapi_enum_parse() in future, when we can 257 * make that function emit a more friendly error message */ 258 static int qcrypto_block_luks_name_lookup(const char *name, 259 const char *const *map, 260 size_t maplen, 261 const char *type, 262 Error **errp) 263 { 264 size_t i; 265 for (i = 0; i < maplen; i++) { 266 if (g_str_equal(map[i], name)) { 267 return i; 268 } 269 } 270 271 error_setg(errp, "%s %s not supported", type, name); 272 return 0; 273 } 274 275 #define qcrypto_block_luks_cipher_mode_lookup(name, errp) \ 276 qcrypto_block_luks_name_lookup(name, \ 277 QCryptoCipherMode_lookup, \ 278 QCRYPTO_CIPHER_MODE__MAX, \ 279 "Cipher mode", \ 280 errp) 281 282 #define qcrypto_block_luks_hash_name_lookup(name, errp) \ 283 qcrypto_block_luks_name_lookup(name, \ 284 QCryptoHashAlgorithm_lookup, \ 285 QCRYPTO_HASH_ALG__MAX, \ 286 "Hash algorithm", \ 287 errp) 288 289 #define qcrypto_block_luks_ivgen_name_lookup(name, errp) \ 290 qcrypto_block_luks_name_lookup(name, \ 291 QCryptoIVGenAlgorithm_lookup, \ 292 QCRYPTO_IVGEN_ALG__MAX, \ 293 "IV generator", \ 294 errp) 295 296 297 static bool 298 qcrypto_block_luks_has_format(const uint8_t *buf, 299 size_t buf_size) 300 { 301 const QCryptoBlockLUKSHeader *luks_header = (const void *)buf; 302 303 if (buf_size >= offsetof(QCryptoBlockLUKSHeader, cipher_name) && 304 memcmp(luks_header->magic, qcrypto_block_luks_magic, 305 QCRYPTO_BLOCK_LUKS_MAGIC_LEN) == 0 && 306 be16_to_cpu(luks_header->version) == QCRYPTO_BLOCK_LUKS_VERSION) { 307 return true; 308 } else { 309 return false; 310 } 311 } 312 313 314 /** 315 * Deal with a quirk of dm-crypt usage of ESSIV. 316 * 317 * When calculating ESSIV IVs, the cipher length used by ESSIV 318 * may be different from the cipher length used for the block 319 * encryption, becauses dm-crypt uses the hash digest length 320 * as the key size. ie, if you have AES 128 as the block cipher 321 * and SHA 256 as ESSIV hash, then ESSIV will use AES 256 as 322 * the cipher since that gets a key length matching the digest 323 * size, not AES 128 with truncated digest as might be imagined 324 */ 325 static QCryptoCipherAlgorithm 326 qcrypto_block_luks_essiv_cipher(QCryptoCipherAlgorithm cipher, 327 QCryptoHashAlgorithm hash, 328 Error **errp) 329 { 330 size_t digestlen = qcrypto_hash_digest_len(hash); 331 size_t keylen = qcrypto_cipher_get_key_len(cipher); 332 if (digestlen == keylen) { 333 return cipher; 334 } 335 336 switch (cipher) { 337 case QCRYPTO_CIPHER_ALG_AES_128: 338 case QCRYPTO_CIPHER_ALG_AES_192: 339 case QCRYPTO_CIPHER_ALG_AES_256: 340 if (digestlen == qcrypto_cipher_get_key_len( 341 QCRYPTO_CIPHER_ALG_AES_128)) { 342 return QCRYPTO_CIPHER_ALG_AES_128; 343 } else if (digestlen == qcrypto_cipher_get_key_len( 344 QCRYPTO_CIPHER_ALG_AES_192)) { 345 return QCRYPTO_CIPHER_ALG_AES_192; 346 } else if (digestlen == qcrypto_cipher_get_key_len( 347 QCRYPTO_CIPHER_ALG_AES_256)) { 348 return QCRYPTO_CIPHER_ALG_AES_256; 349 } else { 350 error_setg(errp, "No AES cipher with key size %zu available", 351 digestlen); 352 return 0; 353 } 354 break; 355 case QCRYPTO_CIPHER_ALG_SERPENT_128: 356 case QCRYPTO_CIPHER_ALG_SERPENT_192: 357 case QCRYPTO_CIPHER_ALG_SERPENT_256: 358 if (digestlen == qcrypto_cipher_get_key_len( 359 QCRYPTO_CIPHER_ALG_SERPENT_128)) { 360 return QCRYPTO_CIPHER_ALG_SERPENT_128; 361 } else if (digestlen == qcrypto_cipher_get_key_len( 362 QCRYPTO_CIPHER_ALG_SERPENT_192)) { 363 return QCRYPTO_CIPHER_ALG_SERPENT_192; 364 } else if (digestlen == qcrypto_cipher_get_key_len( 365 QCRYPTO_CIPHER_ALG_SERPENT_256)) { 366 return QCRYPTO_CIPHER_ALG_SERPENT_256; 367 } else { 368 error_setg(errp, "No Serpent cipher with key size %zu available", 369 digestlen); 370 return 0; 371 } 372 break; 373 case QCRYPTO_CIPHER_ALG_TWOFISH_128: 374 case QCRYPTO_CIPHER_ALG_TWOFISH_192: 375 case QCRYPTO_CIPHER_ALG_TWOFISH_256: 376 if (digestlen == qcrypto_cipher_get_key_len( 377 QCRYPTO_CIPHER_ALG_TWOFISH_128)) { 378 return QCRYPTO_CIPHER_ALG_TWOFISH_128; 379 } else if (digestlen == qcrypto_cipher_get_key_len( 380 QCRYPTO_CIPHER_ALG_TWOFISH_192)) { 381 return QCRYPTO_CIPHER_ALG_TWOFISH_192; 382 } else if (digestlen == qcrypto_cipher_get_key_len( 383 QCRYPTO_CIPHER_ALG_TWOFISH_256)) { 384 return QCRYPTO_CIPHER_ALG_TWOFISH_256; 385 } else { 386 error_setg(errp, "No Twofish cipher with key size %zu available", 387 digestlen); 388 return 0; 389 } 390 break; 391 default: 392 error_setg(errp, "Cipher %s not supported with essiv", 393 QCryptoCipherAlgorithm_lookup[cipher]); 394 return 0; 395 } 396 } 397 398 /* 399 * Given a key slot, and user password, this will attempt to unlock 400 * the master encryption key from the key slot. 401 * 402 * Returns: 403 * 0 if the key slot is disabled, or key could not be decrypted 404 * with the provided password 405 * 1 if the key slot is enabled, and key decrypted successfully 406 * with the provided password 407 * -1 if a fatal error occurred loading the key 408 */ 409 static int 410 qcrypto_block_luks_load_key(QCryptoBlock *block, 411 QCryptoBlockLUKSKeySlot *slot, 412 const char *password, 413 QCryptoCipherAlgorithm cipheralg, 414 QCryptoCipherMode ciphermode, 415 QCryptoHashAlgorithm hash, 416 QCryptoIVGenAlgorithm ivalg, 417 QCryptoCipherAlgorithm ivcipheralg, 418 QCryptoHashAlgorithm ivhash, 419 uint8_t *masterkey, 420 size_t masterkeylen, 421 QCryptoBlockReadFunc readfunc, 422 void *opaque, 423 Error **errp) 424 { 425 QCryptoBlockLUKS *luks = block->opaque; 426 uint8_t *splitkey; 427 size_t splitkeylen; 428 uint8_t *possiblekey; 429 int ret = -1; 430 ssize_t rv; 431 QCryptoCipher *cipher = NULL; 432 uint8_t keydigest[QCRYPTO_BLOCK_LUKS_DIGEST_LEN]; 433 QCryptoIVGen *ivgen = NULL; 434 size_t niv; 435 436 if (slot->active != QCRYPTO_BLOCK_LUKS_KEY_SLOT_ENABLED) { 437 return 0; 438 } 439 440 splitkeylen = masterkeylen * slot->stripes; 441 splitkey = g_new0(uint8_t, splitkeylen); 442 possiblekey = g_new0(uint8_t, masterkeylen); 443 444 /* 445 * The user password is used to generate a (possible) 446 * decryption key. This may or may not successfully 447 * decrypt the master key - we just blindly assume 448 * the key is correct and validate the results of 449 * decryption later. 450 */ 451 if (qcrypto_pbkdf2(hash, 452 (const uint8_t *)password, strlen(password), 453 slot->salt, QCRYPTO_BLOCK_LUKS_SALT_LEN, 454 slot->iterations, 455 possiblekey, masterkeylen, 456 errp) < 0) { 457 goto cleanup; 458 } 459 460 /* 461 * We need to read the master key material from the 462 * LUKS key material header. What we're reading is 463 * not the raw master key, but rather the data after 464 * it has been passed through AFSplit and the result 465 * then encrypted. 466 */ 467 rv = readfunc(block, 468 slot->key_offset * QCRYPTO_BLOCK_LUKS_SECTOR_SIZE, 469 splitkey, splitkeylen, 470 errp, 471 opaque); 472 if (rv < 0) { 473 goto cleanup; 474 } 475 476 477 /* Setup the cipher/ivgen that we'll use to try to decrypt 478 * the split master key material */ 479 cipher = qcrypto_cipher_new(cipheralg, ciphermode, 480 possiblekey, masterkeylen, 481 errp); 482 if (!cipher) { 483 goto cleanup; 484 } 485 486 niv = qcrypto_cipher_get_iv_len(cipheralg, 487 ciphermode); 488 ivgen = qcrypto_ivgen_new(ivalg, 489 ivcipheralg, 490 ivhash, 491 possiblekey, masterkeylen, 492 errp); 493 if (!ivgen) { 494 goto cleanup; 495 } 496 497 498 /* 499 * The master key needs to be decrypted in the same 500 * way that the block device payload will be decrypted 501 * later. In particular we'll be using the IV generator 502 * to reset the encryption cipher every time the master 503 * key crosses a sector boundary. 504 */ 505 if (qcrypto_block_decrypt_helper(cipher, 506 niv, 507 ivgen, 508 QCRYPTO_BLOCK_LUKS_SECTOR_SIZE, 509 0, 510 splitkey, 511 splitkeylen, 512 errp) < 0) { 513 goto cleanup; 514 } 515 516 /* 517 * Now we've decrypted the split master key, join 518 * it back together to get the actual master key. 519 */ 520 if (qcrypto_afsplit_decode(hash, 521 masterkeylen, 522 slot->stripes, 523 splitkey, 524 masterkey, 525 errp) < 0) { 526 goto cleanup; 527 } 528 529 530 /* 531 * We still don't know that the masterkey we got is valid, 532 * because we just blindly assumed the user's password 533 * was correct. This is where we now verify it. We are 534 * creating a hash of the master key using PBKDF and 535 * then comparing that to the hash stored in the key slot 536 * header 537 */ 538 if (qcrypto_pbkdf2(hash, 539 masterkey, masterkeylen, 540 luks->header.master_key_salt, 541 QCRYPTO_BLOCK_LUKS_SALT_LEN, 542 luks->header.master_key_iterations, 543 keydigest, G_N_ELEMENTS(keydigest), 544 errp) < 0) { 545 goto cleanup; 546 } 547 548 if (memcmp(keydigest, luks->header.master_key_digest, 549 QCRYPTO_BLOCK_LUKS_DIGEST_LEN) == 0) { 550 /* Success, we got the right master key */ 551 ret = 1; 552 goto cleanup; 553 } 554 555 /* Fail, user's password was not valid for this key slot, 556 * tell caller to try another slot */ 557 ret = 0; 558 559 cleanup: 560 qcrypto_ivgen_free(ivgen); 561 qcrypto_cipher_free(cipher); 562 g_free(splitkey); 563 g_free(possiblekey); 564 return ret; 565 } 566 567 568 /* 569 * Given a user password, this will iterate over all key 570 * slots and try to unlock each active key slot using the 571 * password until it successfully obtains a master key. 572 * 573 * Returns 0 if a key was loaded, -1 if no keys could be loaded 574 */ 575 static int 576 qcrypto_block_luks_find_key(QCryptoBlock *block, 577 const char *password, 578 QCryptoCipherAlgorithm cipheralg, 579 QCryptoCipherMode ciphermode, 580 QCryptoHashAlgorithm hash, 581 QCryptoIVGenAlgorithm ivalg, 582 QCryptoCipherAlgorithm ivcipheralg, 583 QCryptoHashAlgorithm ivhash, 584 uint8_t **masterkey, 585 size_t *masterkeylen, 586 QCryptoBlockReadFunc readfunc, 587 void *opaque, 588 Error **errp) 589 { 590 QCryptoBlockLUKS *luks = block->opaque; 591 size_t i; 592 int rv; 593 594 *masterkey = g_new0(uint8_t, luks->header.key_bytes); 595 *masterkeylen = luks->header.key_bytes; 596 597 for (i = 0; i < QCRYPTO_BLOCK_LUKS_NUM_KEY_SLOTS; i++) { 598 rv = qcrypto_block_luks_load_key(block, 599 &luks->header.key_slots[i], 600 password, 601 cipheralg, 602 ciphermode, 603 hash, 604 ivalg, 605 ivcipheralg, 606 ivhash, 607 *masterkey, 608 *masterkeylen, 609 readfunc, 610 opaque, 611 errp); 612 if (rv < 0) { 613 goto error; 614 } 615 if (rv == 1) { 616 return 0; 617 } 618 } 619 620 error_setg(errp, "Invalid password, cannot unlock any keyslot"); 621 622 error: 623 g_free(*masterkey); 624 *masterkey = NULL; 625 *masterkeylen = 0; 626 return -1; 627 } 628 629 630 static int 631 qcrypto_block_luks_open(QCryptoBlock *block, 632 QCryptoBlockOpenOptions *options, 633 QCryptoBlockReadFunc readfunc, 634 void *opaque, 635 unsigned int flags, 636 Error **errp) 637 { 638 QCryptoBlockLUKS *luks; 639 Error *local_err = NULL; 640 int ret = 0; 641 size_t i; 642 ssize_t rv; 643 uint8_t *masterkey = NULL; 644 size_t masterkeylen; 645 char *ivgen_name, *ivhash_name; 646 QCryptoCipherMode ciphermode; 647 QCryptoCipherAlgorithm cipheralg; 648 QCryptoIVGenAlgorithm ivalg; 649 QCryptoCipherAlgorithm ivcipheralg; 650 QCryptoHashAlgorithm hash; 651 QCryptoHashAlgorithm ivhash; 652 char *password = NULL; 653 654 if (!(flags & QCRYPTO_BLOCK_OPEN_NO_IO)) { 655 if (!options->u.luks.key_secret) { 656 error_setg(errp, "Parameter 'key-secret' is required for cipher"); 657 return -1; 658 } 659 password = qcrypto_secret_lookup_as_utf8( 660 options->u.luks.key_secret, errp); 661 if (!password) { 662 return -1; 663 } 664 } 665 666 luks = g_new0(QCryptoBlockLUKS, 1); 667 block->opaque = luks; 668 669 /* Read the entire LUKS header, minus the key material from 670 * the underlying device */ 671 rv = readfunc(block, 0, 672 (uint8_t *)&luks->header, 673 sizeof(luks->header), 674 errp, 675 opaque); 676 if (rv < 0) { 677 ret = rv; 678 goto fail; 679 } 680 681 /* The header is always stored in big-endian format, so 682 * convert everything to native */ 683 be16_to_cpus(&luks->header.version); 684 be32_to_cpus(&luks->header.payload_offset); 685 be32_to_cpus(&luks->header.key_bytes); 686 be32_to_cpus(&luks->header.master_key_iterations); 687 688 for (i = 0; i < QCRYPTO_BLOCK_LUKS_NUM_KEY_SLOTS; i++) { 689 be32_to_cpus(&luks->header.key_slots[i].active); 690 be32_to_cpus(&luks->header.key_slots[i].iterations); 691 be32_to_cpus(&luks->header.key_slots[i].key_offset); 692 be32_to_cpus(&luks->header.key_slots[i].stripes); 693 } 694 695 if (memcmp(luks->header.magic, qcrypto_block_luks_magic, 696 QCRYPTO_BLOCK_LUKS_MAGIC_LEN) != 0) { 697 error_setg(errp, "Volume is not in LUKS format"); 698 ret = -EINVAL; 699 goto fail; 700 } 701 if (luks->header.version != QCRYPTO_BLOCK_LUKS_VERSION) { 702 error_setg(errp, "LUKS version %" PRIu32 " is not supported", 703 luks->header.version); 704 ret = -ENOTSUP; 705 goto fail; 706 } 707 708 /* 709 * The cipher_mode header contains a string that we have 710 * to further parse, of the format 711 * 712 * <cipher-mode>-<iv-generator>[:<iv-hash>] 713 * 714 * eg cbc-essiv:sha256, cbc-plain64 715 */ 716 ivgen_name = strchr(luks->header.cipher_mode, '-'); 717 if (!ivgen_name) { 718 ret = -EINVAL; 719 error_setg(errp, "Unexpected cipher mode string format %s", 720 luks->header.cipher_mode); 721 goto fail; 722 } 723 *ivgen_name = '\0'; 724 ivgen_name++; 725 726 ivhash_name = strchr(ivgen_name, ':'); 727 if (!ivhash_name) { 728 ivhash = 0; 729 } else { 730 *ivhash_name = '\0'; 731 ivhash_name++; 732 733 ivhash = qcrypto_block_luks_hash_name_lookup(ivhash_name, 734 &local_err); 735 if (local_err) { 736 ret = -ENOTSUP; 737 error_propagate(errp, local_err); 738 goto fail; 739 } 740 } 741 742 ciphermode = qcrypto_block_luks_cipher_mode_lookup(luks->header.cipher_mode, 743 &local_err); 744 if (local_err) { 745 ret = -ENOTSUP; 746 error_propagate(errp, local_err); 747 goto fail; 748 } 749 750 cipheralg = qcrypto_block_luks_cipher_name_lookup(luks->header.cipher_name, 751 ciphermode, 752 luks->header.key_bytes, 753 &local_err); 754 if (local_err) { 755 ret = -ENOTSUP; 756 error_propagate(errp, local_err); 757 goto fail; 758 } 759 760 hash = qcrypto_block_luks_hash_name_lookup(luks->header.hash_spec, 761 &local_err); 762 if (local_err) { 763 ret = -ENOTSUP; 764 error_propagate(errp, local_err); 765 goto fail; 766 } 767 768 ivalg = qcrypto_block_luks_ivgen_name_lookup(ivgen_name, 769 &local_err); 770 if (local_err) { 771 ret = -ENOTSUP; 772 error_propagate(errp, local_err); 773 goto fail; 774 } 775 776 if (ivalg == QCRYPTO_IVGEN_ALG_ESSIV) { 777 ivcipheralg = qcrypto_block_luks_essiv_cipher(cipheralg, 778 ivhash, 779 &local_err); 780 if (local_err) { 781 ret = -ENOTSUP; 782 error_propagate(errp, local_err); 783 goto fail; 784 } 785 } else { 786 ivcipheralg = cipheralg; 787 } 788 789 if (!(flags & QCRYPTO_BLOCK_OPEN_NO_IO)) { 790 /* Try to find which key slot our password is valid for 791 * and unlock the master key from that slot. 792 */ 793 if (qcrypto_block_luks_find_key(block, 794 password, 795 cipheralg, ciphermode, 796 hash, 797 ivalg, 798 ivcipheralg, 799 ivhash, 800 &masterkey, &masterkeylen, 801 readfunc, opaque, 802 errp) < 0) { 803 ret = -EACCES; 804 goto fail; 805 } 806 807 /* We have a valid master key now, so can setup the 808 * block device payload decryption objects 809 */ 810 block->kdfhash = hash; 811 block->niv = qcrypto_cipher_get_iv_len(cipheralg, 812 ciphermode); 813 block->ivgen = qcrypto_ivgen_new(ivalg, 814 ivcipheralg, 815 ivhash, 816 masterkey, masterkeylen, 817 errp); 818 if (!block->ivgen) { 819 ret = -ENOTSUP; 820 goto fail; 821 } 822 823 block->cipher = qcrypto_cipher_new(cipheralg, 824 ciphermode, 825 masterkey, masterkeylen, 826 errp); 827 if (!block->cipher) { 828 ret = -ENOTSUP; 829 goto fail; 830 } 831 } 832 833 block->payload_offset = luks->header.payload_offset * 834 QCRYPTO_BLOCK_LUKS_SECTOR_SIZE; 835 836 g_free(masterkey); 837 g_free(password); 838 839 return 0; 840 841 fail: 842 g_free(masterkey); 843 qcrypto_cipher_free(block->cipher); 844 qcrypto_ivgen_free(block->ivgen); 845 g_free(luks); 846 g_free(password); 847 return ret; 848 } 849 850 851 static int 852 qcrypto_block_luks_uuid_gen(uint8_t *uuidstr, Error **errp) 853 { 854 #ifdef CONFIG_UUID 855 uuid_t uuid; 856 uuid_generate(uuid); 857 uuid_unparse(uuid, (char *)uuidstr); 858 return 0; 859 #else 860 error_setg(errp, "Unable to generate uuids on this platform"); 861 return -1; 862 #endif 863 } 864 865 static int 866 qcrypto_block_luks_create(QCryptoBlock *block, 867 QCryptoBlockCreateOptions *options, 868 QCryptoBlockInitFunc initfunc, 869 QCryptoBlockWriteFunc writefunc, 870 void *opaque, 871 Error **errp) 872 { 873 QCryptoBlockLUKS *luks; 874 QCryptoBlockCreateOptionsLUKS luks_opts; 875 Error *local_err = NULL; 876 uint8_t *masterkey = NULL; 877 uint8_t *slotkey = NULL; 878 uint8_t *splitkey = NULL; 879 size_t splitkeylen = 0; 880 size_t i; 881 QCryptoCipher *cipher = NULL; 882 QCryptoIVGen *ivgen = NULL; 883 char *password; 884 const char *cipher_alg; 885 const char *cipher_mode; 886 const char *ivgen_alg; 887 const char *ivgen_hash_alg = NULL; 888 const char *hash_alg; 889 char *cipher_mode_spec = NULL; 890 QCryptoCipherAlgorithm ivcipheralg = 0; 891 892 memcpy(&luks_opts, &options->u.luks, sizeof(luks_opts)); 893 if (!luks_opts.has_cipher_alg) { 894 luks_opts.cipher_alg = QCRYPTO_CIPHER_ALG_AES_256; 895 } 896 if (!luks_opts.has_cipher_mode) { 897 luks_opts.cipher_mode = QCRYPTO_CIPHER_MODE_XTS; 898 } 899 if (!luks_opts.has_ivgen_alg) { 900 luks_opts.ivgen_alg = QCRYPTO_IVGEN_ALG_PLAIN64; 901 } 902 if (!luks_opts.has_hash_alg) { 903 luks_opts.hash_alg = QCRYPTO_HASH_ALG_SHA256; 904 } 905 906 if (!options->u.luks.key_secret) { 907 error_setg(errp, "Parameter 'key-secret' is required for cipher"); 908 return -1; 909 } 910 password = qcrypto_secret_lookup_as_utf8(luks_opts.key_secret, errp); 911 if (!password) { 912 return -1; 913 } 914 915 luks = g_new0(QCryptoBlockLUKS, 1); 916 block->opaque = luks; 917 918 memcpy(luks->header.magic, qcrypto_block_luks_magic, 919 QCRYPTO_BLOCK_LUKS_MAGIC_LEN); 920 921 /* We populate the header in native endianness initially and 922 * then convert everything to big endian just before writing 923 * it out to disk 924 */ 925 luks->header.version = QCRYPTO_BLOCK_LUKS_VERSION; 926 if (qcrypto_block_luks_uuid_gen(luks->header.uuid, 927 errp) < 0) { 928 goto error; 929 } 930 931 cipher_alg = qcrypto_block_luks_cipher_alg_lookup(luks_opts.cipher_alg, 932 errp); 933 if (!cipher_alg) { 934 goto error; 935 } 936 937 cipher_mode = QCryptoCipherMode_lookup[luks_opts.cipher_mode]; 938 ivgen_alg = QCryptoIVGenAlgorithm_lookup[luks_opts.ivgen_alg]; 939 if (luks_opts.has_ivgen_hash_alg) { 940 ivgen_hash_alg = QCryptoHashAlgorithm_lookup[luks_opts.ivgen_hash_alg]; 941 cipher_mode_spec = g_strdup_printf("%s-%s:%s", cipher_mode, ivgen_alg, 942 ivgen_hash_alg); 943 } else { 944 cipher_mode_spec = g_strdup_printf("%s-%s", cipher_mode, ivgen_alg); 945 } 946 hash_alg = QCryptoHashAlgorithm_lookup[luks_opts.hash_alg]; 947 948 949 if (strlen(cipher_alg) >= QCRYPTO_BLOCK_LUKS_CIPHER_NAME_LEN) { 950 error_setg(errp, "Cipher name '%s' is too long for LUKS header", 951 cipher_alg); 952 goto error; 953 } 954 if (strlen(cipher_mode_spec) >= QCRYPTO_BLOCK_LUKS_CIPHER_MODE_LEN) { 955 error_setg(errp, "Cipher mode '%s' is too long for LUKS header", 956 cipher_mode_spec); 957 goto error; 958 } 959 if (strlen(hash_alg) >= QCRYPTO_BLOCK_LUKS_HASH_SPEC_LEN) { 960 error_setg(errp, "Hash name '%s' is too long for LUKS header", 961 hash_alg); 962 goto error; 963 } 964 965 if (luks_opts.ivgen_alg == QCRYPTO_IVGEN_ALG_ESSIV) { 966 ivcipheralg = qcrypto_block_luks_essiv_cipher(luks_opts.cipher_alg, 967 luks_opts.ivgen_hash_alg, 968 &local_err); 969 if (local_err) { 970 error_propagate(errp, local_err); 971 goto error; 972 } 973 } else { 974 ivcipheralg = luks_opts.cipher_alg; 975 } 976 977 strcpy(luks->header.cipher_name, cipher_alg); 978 strcpy(luks->header.cipher_mode, cipher_mode_spec); 979 strcpy(luks->header.hash_spec, hash_alg); 980 981 luks->header.key_bytes = qcrypto_cipher_get_key_len(luks_opts.cipher_alg); 982 if (luks_opts.cipher_mode == QCRYPTO_CIPHER_MODE_XTS) { 983 luks->header.key_bytes *= 2; 984 } 985 986 /* Generate the salt used for hashing the master key 987 * with PBKDF later 988 */ 989 if (qcrypto_random_bytes(luks->header.master_key_salt, 990 QCRYPTO_BLOCK_LUKS_SALT_LEN, 991 errp) < 0) { 992 goto error; 993 } 994 995 /* Generate random master key */ 996 masterkey = g_new0(uint8_t, luks->header.key_bytes); 997 if (qcrypto_random_bytes(masterkey, 998 luks->header.key_bytes, errp) < 0) { 999 goto error; 1000 } 1001 1002 1003 /* Setup the block device payload encryption objects */ 1004 block->cipher = qcrypto_cipher_new(luks_opts.cipher_alg, 1005 luks_opts.cipher_mode, 1006 masterkey, luks->header.key_bytes, 1007 errp); 1008 if (!block->cipher) { 1009 goto error; 1010 } 1011 1012 block->kdfhash = luks_opts.hash_alg; 1013 block->niv = qcrypto_cipher_get_iv_len(luks_opts.cipher_alg, 1014 luks_opts.cipher_mode); 1015 block->ivgen = qcrypto_ivgen_new(luks_opts.ivgen_alg, 1016 ivcipheralg, 1017 luks_opts.ivgen_hash_alg, 1018 masterkey, luks->header.key_bytes, 1019 errp); 1020 1021 if (!block->ivgen) { 1022 goto error; 1023 } 1024 1025 1026 /* Determine how many iterations we need to hash the master 1027 * key, in order to have 1 second of compute time used 1028 */ 1029 luks->header.master_key_iterations = 1030 qcrypto_pbkdf2_count_iters(luks_opts.hash_alg, 1031 masterkey, luks->header.key_bytes, 1032 luks->header.master_key_salt, 1033 QCRYPTO_BLOCK_LUKS_SALT_LEN, 1034 &local_err); 1035 if (local_err) { 1036 error_propagate(errp, local_err); 1037 goto error; 1038 } 1039 1040 /* Why /= 8 ? That matches cryptsetup, but there's no 1041 * explanation why they chose /= 8... Probably so that 1042 * if all 8 keyslots are active we only spend 1 second 1043 * in total time to check all keys */ 1044 luks->header.master_key_iterations /= 8; 1045 luks->header.master_key_iterations = MAX( 1046 luks->header.master_key_iterations, 1047 QCRYPTO_BLOCK_LUKS_MIN_MASTER_KEY_ITERS); 1048 1049 1050 /* Hash the master key, saving the result in the LUKS 1051 * header. This hash is used when opening the encrypted 1052 * device to verify that the user password unlocked a 1053 * valid master key 1054 */ 1055 if (qcrypto_pbkdf2(luks_opts.hash_alg, 1056 masterkey, luks->header.key_bytes, 1057 luks->header.master_key_salt, 1058 QCRYPTO_BLOCK_LUKS_SALT_LEN, 1059 luks->header.master_key_iterations, 1060 luks->header.master_key_digest, 1061 QCRYPTO_BLOCK_LUKS_DIGEST_LEN, 1062 errp) < 0) { 1063 goto error; 1064 } 1065 1066 1067 /* Although LUKS has multiple key slots, we're just going 1068 * to use the first key slot */ 1069 splitkeylen = luks->header.key_bytes * QCRYPTO_BLOCK_LUKS_STRIPES; 1070 for (i = 0; i < QCRYPTO_BLOCK_LUKS_NUM_KEY_SLOTS; i++) { 1071 luks->header.key_slots[i].active = i == 0 ? 1072 QCRYPTO_BLOCK_LUKS_KEY_SLOT_ENABLED : 1073 QCRYPTO_BLOCK_LUKS_KEY_SLOT_DISABLED; 1074 luks->header.key_slots[i].stripes = QCRYPTO_BLOCK_LUKS_STRIPES; 1075 1076 /* This calculation doesn't match that shown in the spec, 1077 * but instead follows the cryptsetup implementation. 1078 */ 1079 luks->header.key_slots[i].key_offset = 1080 (QCRYPTO_BLOCK_LUKS_KEY_SLOT_OFFSET / 1081 QCRYPTO_BLOCK_LUKS_SECTOR_SIZE) + 1082 (ROUND_UP(((splitkeylen + (QCRYPTO_BLOCK_LUKS_SECTOR_SIZE - 1)) / 1083 QCRYPTO_BLOCK_LUKS_SECTOR_SIZE), 1084 (QCRYPTO_BLOCK_LUKS_KEY_SLOT_OFFSET / 1085 QCRYPTO_BLOCK_LUKS_SECTOR_SIZE)) * i); 1086 } 1087 1088 if (qcrypto_random_bytes(luks->header.key_slots[0].salt, 1089 QCRYPTO_BLOCK_LUKS_SALT_LEN, 1090 errp) < 0) { 1091 goto error; 1092 } 1093 1094 /* Again we determine how many iterations are required to 1095 * hash the user password while consuming 1 second of compute 1096 * time */ 1097 luks->header.key_slots[0].iterations = 1098 qcrypto_pbkdf2_count_iters(luks_opts.hash_alg, 1099 (uint8_t *)password, strlen(password), 1100 luks->header.key_slots[0].salt, 1101 QCRYPTO_BLOCK_LUKS_SALT_LEN, 1102 &local_err); 1103 if (local_err) { 1104 error_propagate(errp, local_err); 1105 goto error; 1106 } 1107 /* Why /= 2 ? That matches cryptsetup, but there's no 1108 * explanation why they chose /= 2... */ 1109 luks->header.key_slots[0].iterations /= 2; 1110 luks->header.key_slots[0].iterations = MAX( 1111 luks->header.key_slots[0].iterations, 1112 QCRYPTO_BLOCK_LUKS_MIN_SLOT_KEY_ITERS); 1113 1114 1115 /* Generate a key that we'll use to encrypt the master 1116 * key, from the user's password 1117 */ 1118 slotkey = g_new0(uint8_t, luks->header.key_bytes); 1119 if (qcrypto_pbkdf2(luks_opts.hash_alg, 1120 (uint8_t *)password, strlen(password), 1121 luks->header.key_slots[0].salt, 1122 QCRYPTO_BLOCK_LUKS_SALT_LEN, 1123 luks->header.key_slots[0].iterations, 1124 slotkey, luks->header.key_bytes, 1125 errp) < 0) { 1126 goto error; 1127 } 1128 1129 1130 /* Setup the encryption objects needed to encrypt the 1131 * master key material 1132 */ 1133 cipher = qcrypto_cipher_new(luks_opts.cipher_alg, 1134 luks_opts.cipher_mode, 1135 slotkey, luks->header.key_bytes, 1136 errp); 1137 if (!cipher) { 1138 goto error; 1139 } 1140 1141 ivgen = qcrypto_ivgen_new(luks_opts.ivgen_alg, 1142 ivcipheralg, 1143 luks_opts.ivgen_hash_alg, 1144 slotkey, luks->header.key_bytes, 1145 errp); 1146 if (!ivgen) { 1147 goto error; 1148 } 1149 1150 /* Before storing the master key, we need to vastly 1151 * increase its size, as protection against forensic 1152 * disk data recovery */ 1153 splitkey = g_new0(uint8_t, splitkeylen); 1154 1155 if (qcrypto_afsplit_encode(luks_opts.hash_alg, 1156 luks->header.key_bytes, 1157 luks->header.key_slots[0].stripes, 1158 masterkey, 1159 splitkey, 1160 errp) < 0) { 1161 goto error; 1162 } 1163 1164 /* Now we encrypt the split master key with the key generated 1165 * from the user's password, before storing it */ 1166 if (qcrypto_block_encrypt_helper(cipher, block->niv, ivgen, 1167 QCRYPTO_BLOCK_LUKS_SECTOR_SIZE, 1168 0, 1169 splitkey, 1170 splitkeylen, 1171 errp) < 0) { 1172 goto error; 1173 } 1174 1175 1176 /* The total size of the LUKS headers is the partition header + key 1177 * slot headers, rounded up to the nearest sector, combined with 1178 * the size of each master key material region, also rounded up 1179 * to the nearest sector */ 1180 luks->header.payload_offset = 1181 (QCRYPTO_BLOCK_LUKS_KEY_SLOT_OFFSET / 1182 QCRYPTO_BLOCK_LUKS_SECTOR_SIZE) + 1183 (ROUND_UP(((splitkeylen + (QCRYPTO_BLOCK_LUKS_SECTOR_SIZE - 1)) / 1184 QCRYPTO_BLOCK_LUKS_SECTOR_SIZE), 1185 (QCRYPTO_BLOCK_LUKS_KEY_SLOT_OFFSET / 1186 QCRYPTO_BLOCK_LUKS_SECTOR_SIZE)) * 1187 QCRYPTO_BLOCK_LUKS_NUM_KEY_SLOTS); 1188 1189 block->payload_offset = luks->header.payload_offset * 1190 QCRYPTO_BLOCK_LUKS_SECTOR_SIZE; 1191 1192 /* Reserve header space to match payload offset */ 1193 initfunc(block, block->payload_offset, &local_err, opaque); 1194 if (local_err) { 1195 error_propagate(errp, local_err); 1196 goto error; 1197 } 1198 1199 /* Everything on disk uses Big Endian, so flip header fields 1200 * before writing them */ 1201 cpu_to_be16s(&luks->header.version); 1202 cpu_to_be32s(&luks->header.payload_offset); 1203 cpu_to_be32s(&luks->header.key_bytes); 1204 cpu_to_be32s(&luks->header.master_key_iterations); 1205 1206 for (i = 0; i < QCRYPTO_BLOCK_LUKS_NUM_KEY_SLOTS; i++) { 1207 cpu_to_be32s(&luks->header.key_slots[i].active); 1208 cpu_to_be32s(&luks->header.key_slots[i].iterations); 1209 cpu_to_be32s(&luks->header.key_slots[i].key_offset); 1210 cpu_to_be32s(&luks->header.key_slots[i].stripes); 1211 } 1212 1213 1214 /* Write out the partition header and key slot headers */ 1215 writefunc(block, 0, 1216 (const uint8_t *)&luks->header, 1217 sizeof(luks->header), 1218 &local_err, 1219 opaque); 1220 1221 /* Delay checking local_err until we've byte-swapped */ 1222 1223 /* Byte swap the header back to native, in case we need 1224 * to read it again later */ 1225 be16_to_cpus(&luks->header.version); 1226 be32_to_cpus(&luks->header.payload_offset); 1227 be32_to_cpus(&luks->header.key_bytes); 1228 be32_to_cpus(&luks->header.master_key_iterations); 1229 1230 for (i = 0; i < QCRYPTO_BLOCK_LUKS_NUM_KEY_SLOTS; i++) { 1231 be32_to_cpus(&luks->header.key_slots[i].active); 1232 be32_to_cpus(&luks->header.key_slots[i].iterations); 1233 be32_to_cpus(&luks->header.key_slots[i].key_offset); 1234 be32_to_cpus(&luks->header.key_slots[i].stripes); 1235 } 1236 1237 if (local_err) { 1238 error_propagate(errp, local_err); 1239 goto error; 1240 } 1241 1242 /* Write out the master key material, starting at the 1243 * sector immediately following the partition header. */ 1244 if (writefunc(block, 1245 luks->header.key_slots[0].key_offset * 1246 QCRYPTO_BLOCK_LUKS_SECTOR_SIZE, 1247 splitkey, splitkeylen, 1248 errp, 1249 opaque) != splitkeylen) { 1250 goto error; 1251 } 1252 1253 memset(masterkey, 0, luks->header.key_bytes); 1254 g_free(masterkey); 1255 memset(slotkey, 0, luks->header.key_bytes); 1256 g_free(slotkey); 1257 g_free(splitkey); 1258 g_free(password); 1259 g_free(cipher_mode_spec); 1260 1261 qcrypto_ivgen_free(ivgen); 1262 qcrypto_cipher_free(cipher); 1263 1264 return 0; 1265 1266 error: 1267 if (masterkey) { 1268 memset(masterkey, 0, luks->header.key_bytes); 1269 } 1270 g_free(masterkey); 1271 if (slotkey) { 1272 memset(slotkey, 0, luks->header.key_bytes); 1273 } 1274 g_free(slotkey); 1275 g_free(splitkey); 1276 g_free(password); 1277 g_free(cipher_mode_spec); 1278 1279 qcrypto_ivgen_free(ivgen); 1280 qcrypto_cipher_free(cipher); 1281 1282 g_free(luks); 1283 return -1; 1284 } 1285 1286 1287 static void qcrypto_block_luks_cleanup(QCryptoBlock *block) 1288 { 1289 g_free(block->opaque); 1290 } 1291 1292 1293 static int 1294 qcrypto_block_luks_decrypt(QCryptoBlock *block, 1295 uint64_t startsector, 1296 uint8_t *buf, 1297 size_t len, 1298 Error **errp) 1299 { 1300 return qcrypto_block_decrypt_helper(block->cipher, 1301 block->niv, block->ivgen, 1302 QCRYPTO_BLOCK_LUKS_SECTOR_SIZE, 1303 startsector, buf, len, errp); 1304 } 1305 1306 1307 static int 1308 qcrypto_block_luks_encrypt(QCryptoBlock *block, 1309 uint64_t startsector, 1310 uint8_t *buf, 1311 size_t len, 1312 Error **errp) 1313 { 1314 return qcrypto_block_encrypt_helper(block->cipher, 1315 block->niv, block->ivgen, 1316 QCRYPTO_BLOCK_LUKS_SECTOR_SIZE, 1317 startsector, buf, len, errp); 1318 } 1319 1320 1321 const QCryptoBlockDriver qcrypto_block_driver_luks = { 1322 .open = qcrypto_block_luks_open, 1323 .create = qcrypto_block_luks_create, 1324 .cleanup = qcrypto_block_luks_cleanup, 1325 .decrypt = qcrypto_block_luks_decrypt, 1326 .encrypt = qcrypto_block_luks_encrypt, 1327 .has_format = qcrypto_block_luks_has_format, 1328 }; 1329