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21#include "qemu/osdep.h"
22#include "qapi/error.h"
23#include "qemu/bswap.h"
24
25#include "block-luks.h"
26
27#include "crypto/hash.h"
28#include "crypto/afsplit.h"
29#include "crypto/pbkdf.h"
30#include "crypto/secret.h"
31#include "crypto/random.h"
32#include "qemu/uuid.h"
33
34#include "qemu/coroutine.h"
35
36
37
38
39
40
41
42
43
44
45
46
47typedef struct QCryptoBlockLUKS QCryptoBlockLUKS;
48typedef struct QCryptoBlockLUKSHeader QCryptoBlockLUKSHeader;
49typedef struct QCryptoBlockLUKSKeySlot QCryptoBlockLUKSKeySlot;
50
51
52
53#define QCRYPTO_BLOCK_LUKS_VERSION 1
54
55#define QCRYPTO_BLOCK_LUKS_MAGIC_LEN 6
56#define QCRYPTO_BLOCK_LUKS_CIPHER_NAME_LEN 32
57#define QCRYPTO_BLOCK_LUKS_CIPHER_MODE_LEN 32
58#define QCRYPTO_BLOCK_LUKS_HASH_SPEC_LEN 32
59#define QCRYPTO_BLOCK_LUKS_DIGEST_LEN 20
60#define QCRYPTO_BLOCK_LUKS_SALT_LEN 32
61#define QCRYPTO_BLOCK_LUKS_UUID_LEN 40
62#define QCRYPTO_BLOCK_LUKS_NUM_KEY_SLOTS 8
63#define QCRYPTO_BLOCK_LUKS_STRIPES 4000
64#define QCRYPTO_BLOCK_LUKS_MIN_SLOT_KEY_ITERS 1000
65#define QCRYPTO_BLOCK_LUKS_MIN_MASTER_KEY_ITERS 1000
66#define QCRYPTO_BLOCK_LUKS_KEY_SLOT_OFFSET 4096
67
68#define QCRYPTO_BLOCK_LUKS_KEY_SLOT_DISABLED 0x0000DEAD
69#define QCRYPTO_BLOCK_LUKS_KEY_SLOT_ENABLED 0x00AC71F3
70
71#define QCRYPTO_BLOCK_LUKS_SECTOR_SIZE 512LL
72
73static const char qcrypto_block_luks_magic[QCRYPTO_BLOCK_LUKS_MAGIC_LEN] = {
74 'L', 'U', 'K', 'S', 0xBA, 0xBE
75};
76
77typedef struct QCryptoBlockLUKSNameMap QCryptoBlockLUKSNameMap;
78struct QCryptoBlockLUKSNameMap {
79 const char *name;
80 int id;
81};
82
83typedef struct QCryptoBlockLUKSCipherSizeMap QCryptoBlockLUKSCipherSizeMap;
84struct QCryptoBlockLUKSCipherSizeMap {
85 uint32_t key_bytes;
86 int id;
87};
88typedef struct QCryptoBlockLUKSCipherNameMap QCryptoBlockLUKSCipherNameMap;
89struct QCryptoBlockLUKSCipherNameMap {
90 const char *name;
91 const QCryptoBlockLUKSCipherSizeMap *sizes;
92};
93
94
95static const QCryptoBlockLUKSCipherSizeMap
96qcrypto_block_luks_cipher_size_map_aes[] = {
97 { 16, QCRYPTO_CIPHER_ALG_AES_128 },
98 { 24, QCRYPTO_CIPHER_ALG_AES_192 },
99 { 32, QCRYPTO_CIPHER_ALG_AES_256 },
100 { 0, 0 },
101};
102
103static const QCryptoBlockLUKSCipherSizeMap
104qcrypto_block_luks_cipher_size_map_cast5[] = {
105 { 16, QCRYPTO_CIPHER_ALG_CAST5_128 },
106 { 0, 0 },
107};
108
109static const QCryptoBlockLUKSCipherSizeMap
110qcrypto_block_luks_cipher_size_map_serpent[] = {
111 { 16, QCRYPTO_CIPHER_ALG_SERPENT_128 },
112 { 24, QCRYPTO_CIPHER_ALG_SERPENT_192 },
113 { 32, QCRYPTO_CIPHER_ALG_SERPENT_256 },
114 { 0, 0 },
115};
116
117static const QCryptoBlockLUKSCipherSizeMap
118qcrypto_block_luks_cipher_size_map_twofish[] = {
119 { 16, QCRYPTO_CIPHER_ALG_TWOFISH_128 },
120 { 24, QCRYPTO_CIPHER_ALG_TWOFISH_192 },
121 { 32, QCRYPTO_CIPHER_ALG_TWOFISH_256 },
122 { 0, 0 },
123};
124
125static const QCryptoBlockLUKSCipherNameMap
126qcrypto_block_luks_cipher_name_map[] = {
127 { "aes", qcrypto_block_luks_cipher_size_map_aes },
128 { "cast5", qcrypto_block_luks_cipher_size_map_cast5 },
129 { "serpent", qcrypto_block_luks_cipher_size_map_serpent },
130 { "twofish", qcrypto_block_luks_cipher_size_map_twofish },
131};
132
133
134
135
136
137
138struct QCryptoBlockLUKSKeySlot {
139
140 uint32_t active;
141
142 uint32_t iterations;
143
144 uint8_t salt[QCRYPTO_BLOCK_LUKS_SALT_LEN];
145
146 uint32_t key_offset;
147
148 uint32_t stripes;
149} QEMU_PACKED;
150
151QEMU_BUILD_BUG_ON(sizeof(struct QCryptoBlockLUKSKeySlot) != 48);
152
153
154
155
156
157
158struct QCryptoBlockLUKSHeader {
159
160 char magic[QCRYPTO_BLOCK_LUKS_MAGIC_LEN];
161
162
163 uint16_t version;
164
165
166 char cipher_name[QCRYPTO_BLOCK_LUKS_CIPHER_NAME_LEN];
167
168
169 char cipher_mode[QCRYPTO_BLOCK_LUKS_CIPHER_MODE_LEN];
170
171
172 char hash_spec[QCRYPTO_BLOCK_LUKS_HASH_SPEC_LEN];
173
174
175 uint32_t payload_offset;
176
177
178 uint32_t key_bytes;
179
180
181 uint8_t master_key_digest[QCRYPTO_BLOCK_LUKS_DIGEST_LEN];
182
183
184 uint8_t master_key_salt[QCRYPTO_BLOCK_LUKS_SALT_LEN];
185
186
187 uint32_t master_key_iterations;
188
189
190 uint8_t uuid[QCRYPTO_BLOCK_LUKS_UUID_LEN];
191
192
193 QCryptoBlockLUKSKeySlot key_slots[QCRYPTO_BLOCK_LUKS_NUM_KEY_SLOTS];
194} QEMU_PACKED;
195
196QEMU_BUILD_BUG_ON(sizeof(struct QCryptoBlockLUKSHeader) != 592);
197
198
199struct QCryptoBlockLUKS {
200 QCryptoBlockLUKSHeader header;
201
202
203
204
205 QCryptoCipherAlgorithm cipher_alg;
206 QCryptoCipherMode cipher_mode;
207 QCryptoIVGenAlgorithm ivgen_alg;
208 QCryptoHashAlgorithm ivgen_hash_alg;
209 QCryptoHashAlgorithm hash_alg;
210};
211
212
213static int qcrypto_block_luks_cipher_name_lookup(const char *name,
214 QCryptoCipherMode mode,
215 uint32_t key_bytes,
216 Error **errp)
217{
218 const QCryptoBlockLUKSCipherNameMap *map =
219 qcrypto_block_luks_cipher_name_map;
220 size_t maplen = G_N_ELEMENTS(qcrypto_block_luks_cipher_name_map);
221 size_t i, j;
222
223 if (mode == QCRYPTO_CIPHER_MODE_XTS) {
224 key_bytes /= 2;
225 }
226
227 for (i = 0; i < maplen; i++) {
228 if (!g_str_equal(map[i].name, name)) {
229 continue;
230 }
231 for (j = 0; j < map[i].sizes[j].key_bytes; j++) {
232 if (map[i].sizes[j].key_bytes == key_bytes) {
233 return map[i].sizes[j].id;
234 }
235 }
236 }
237
238 error_setg(errp, "Algorithm %s with key size %d bytes not supported",
239 name, key_bytes);
240 return 0;
241}
242
243static const char *
244qcrypto_block_luks_cipher_alg_lookup(QCryptoCipherAlgorithm alg,
245 Error **errp)
246{
247 const QCryptoBlockLUKSCipherNameMap *map =
248 qcrypto_block_luks_cipher_name_map;
249 size_t maplen = G_N_ELEMENTS(qcrypto_block_luks_cipher_name_map);
250 size_t i, j;
251 for (i = 0; i < maplen; i++) {
252 for (j = 0; j < map[i].sizes[j].key_bytes; j++) {
253 if (map[i].sizes[j].id == alg) {
254 return map[i].name;
255 }
256 }
257 }
258
259 error_setg(errp, "Algorithm '%s' not supported",
260 QCryptoCipherAlgorithm_str(alg));
261 return NULL;
262}
263
264
265
266static int qcrypto_block_luks_name_lookup(const char *name,
267 const QEnumLookup *map,
268 const char *type,
269 Error **errp)
270{
271 int ret = qapi_enum_parse(map, name, -1, NULL);
272
273 if (ret < 0) {
274 error_setg(errp, "%s %s not supported", type, name);
275 return 0;
276 }
277 return ret;
278}
279
280#define qcrypto_block_luks_cipher_mode_lookup(name, errp) \
281 qcrypto_block_luks_name_lookup(name, \
282 &QCryptoCipherMode_lookup, \
283 "Cipher mode", \
284 errp)
285
286#define qcrypto_block_luks_hash_name_lookup(name, errp) \
287 qcrypto_block_luks_name_lookup(name, \
288 &QCryptoHashAlgorithm_lookup, \
289 "Hash algorithm", \
290 errp)
291
292#define qcrypto_block_luks_ivgen_name_lookup(name, errp) \
293 qcrypto_block_luks_name_lookup(name, \
294 &QCryptoIVGenAlgorithm_lookup, \
295 "IV generator", \
296 errp)
297
298
299static bool
300qcrypto_block_luks_has_format(const uint8_t *buf,
301 size_t buf_size)
302{
303 const QCryptoBlockLUKSHeader *luks_header = (const void *)buf;
304
305 if (buf_size >= offsetof(QCryptoBlockLUKSHeader, cipher_name) &&
306 memcmp(luks_header->magic, qcrypto_block_luks_magic,
307 QCRYPTO_BLOCK_LUKS_MAGIC_LEN) == 0 &&
308 be16_to_cpu(luks_header->version) == QCRYPTO_BLOCK_LUKS_VERSION) {
309 return true;
310 } else {
311 return false;
312 }
313}
314
315
316
317
318
319
320
321
322
323
324
325
326
327static QCryptoCipherAlgorithm
328qcrypto_block_luks_essiv_cipher(QCryptoCipherAlgorithm cipher,
329 QCryptoHashAlgorithm hash,
330 Error **errp)
331{
332 size_t digestlen = qcrypto_hash_digest_len(hash);
333 size_t keylen = qcrypto_cipher_get_key_len(cipher);
334 if (digestlen == keylen) {
335 return cipher;
336 }
337
338 switch (cipher) {
339 case QCRYPTO_CIPHER_ALG_AES_128:
340 case QCRYPTO_CIPHER_ALG_AES_192:
341 case QCRYPTO_CIPHER_ALG_AES_256:
342 if (digestlen == qcrypto_cipher_get_key_len(
343 QCRYPTO_CIPHER_ALG_AES_128)) {
344 return QCRYPTO_CIPHER_ALG_AES_128;
345 } else if (digestlen == qcrypto_cipher_get_key_len(
346 QCRYPTO_CIPHER_ALG_AES_192)) {
347 return QCRYPTO_CIPHER_ALG_AES_192;
348 } else if (digestlen == qcrypto_cipher_get_key_len(
349 QCRYPTO_CIPHER_ALG_AES_256)) {
350 return QCRYPTO_CIPHER_ALG_AES_256;
351 } else {
352 error_setg(errp, "No AES cipher with key size %zu available",
353 digestlen);
354 return 0;
355 }
356 break;
357 case QCRYPTO_CIPHER_ALG_SERPENT_128:
358 case QCRYPTO_CIPHER_ALG_SERPENT_192:
359 case QCRYPTO_CIPHER_ALG_SERPENT_256:
360 if (digestlen == qcrypto_cipher_get_key_len(
361 QCRYPTO_CIPHER_ALG_SERPENT_128)) {
362 return QCRYPTO_CIPHER_ALG_SERPENT_128;
363 } else if (digestlen == qcrypto_cipher_get_key_len(
364 QCRYPTO_CIPHER_ALG_SERPENT_192)) {
365 return QCRYPTO_CIPHER_ALG_SERPENT_192;
366 } else if (digestlen == qcrypto_cipher_get_key_len(
367 QCRYPTO_CIPHER_ALG_SERPENT_256)) {
368 return QCRYPTO_CIPHER_ALG_SERPENT_256;
369 } else {
370 error_setg(errp, "No Serpent cipher with key size %zu available",
371 digestlen);
372 return 0;
373 }
374 break;
375 case QCRYPTO_CIPHER_ALG_TWOFISH_128:
376 case QCRYPTO_CIPHER_ALG_TWOFISH_192:
377 case QCRYPTO_CIPHER_ALG_TWOFISH_256:
378 if (digestlen == qcrypto_cipher_get_key_len(
379 QCRYPTO_CIPHER_ALG_TWOFISH_128)) {
380 return QCRYPTO_CIPHER_ALG_TWOFISH_128;
381 } else if (digestlen == qcrypto_cipher_get_key_len(
382 QCRYPTO_CIPHER_ALG_TWOFISH_192)) {
383 return QCRYPTO_CIPHER_ALG_TWOFISH_192;
384 } else if (digestlen == qcrypto_cipher_get_key_len(
385 QCRYPTO_CIPHER_ALG_TWOFISH_256)) {
386 return QCRYPTO_CIPHER_ALG_TWOFISH_256;
387 } else {
388 error_setg(errp, "No Twofish cipher with key size %zu available",
389 digestlen);
390 return 0;
391 }
392 break;
393 default:
394 error_setg(errp, "Cipher %s not supported with essiv",
395 QCryptoCipherAlgorithm_str(cipher));
396 return 0;
397 }
398}
399
400
401
402
403
404
405
406
407
408
409
410
411static int
412qcrypto_block_luks_load_key(QCryptoBlock *block,
413 QCryptoBlockLUKSKeySlot *slot,
414 const char *password,
415 QCryptoCipherAlgorithm cipheralg,
416 QCryptoCipherMode ciphermode,
417 QCryptoHashAlgorithm hash,
418 QCryptoIVGenAlgorithm ivalg,
419 QCryptoCipherAlgorithm ivcipheralg,
420 QCryptoHashAlgorithm ivhash,
421 uint8_t *masterkey,
422 size_t masterkeylen,
423 QCryptoBlockReadFunc readfunc,
424 void *opaque,
425 Error **errp)
426{
427 QCryptoBlockLUKS *luks = block->opaque;
428 uint8_t *splitkey;
429 size_t splitkeylen;
430 uint8_t *possiblekey;
431 int ret = -1;
432 ssize_t rv;
433 QCryptoCipher *cipher = NULL;
434 uint8_t keydigest[QCRYPTO_BLOCK_LUKS_DIGEST_LEN];
435 QCryptoIVGen *ivgen = NULL;
436 size_t niv;
437
438 if (slot->active != QCRYPTO_BLOCK_LUKS_KEY_SLOT_ENABLED) {
439 return 0;
440 }
441
442 splitkeylen = masterkeylen * slot->stripes;
443 splitkey = g_new0(uint8_t, splitkeylen);
444 possiblekey = g_new0(uint8_t, masterkeylen);
445
446
447
448
449
450
451
452
453 if (qcrypto_pbkdf2(hash,
454 (const uint8_t *)password, strlen(password),
455 slot->salt, QCRYPTO_BLOCK_LUKS_SALT_LEN,
456 slot->iterations,
457 possiblekey, masterkeylen,
458 errp) < 0) {
459 goto cleanup;
460 }
461
462
463
464
465
466
467
468
469 rv = readfunc(block,
470 slot->key_offset * QCRYPTO_BLOCK_LUKS_SECTOR_SIZE,
471 splitkey, splitkeylen,
472 opaque,
473 errp);
474 if (rv < 0) {
475 goto cleanup;
476 }
477
478
479
480
481 cipher = qcrypto_cipher_new(cipheralg, ciphermode,
482 possiblekey, masterkeylen,
483 errp);
484 if (!cipher) {
485 goto cleanup;
486 }
487
488 niv = qcrypto_cipher_get_iv_len(cipheralg,
489 ciphermode);
490 ivgen = qcrypto_ivgen_new(ivalg,
491 ivcipheralg,
492 ivhash,
493 possiblekey, masterkeylen,
494 errp);
495 if (!ivgen) {
496 goto cleanup;
497 }
498
499
500
501
502
503
504
505
506
507 if (qcrypto_block_decrypt_helper(cipher,
508 niv,
509 ivgen,
510 QCRYPTO_BLOCK_LUKS_SECTOR_SIZE,
511 0,
512 splitkey,
513 splitkeylen,
514 errp) < 0) {
515 goto cleanup;
516 }
517
518
519
520
521
522 if (qcrypto_afsplit_decode(hash,
523 masterkeylen,
524 slot->stripes,
525 splitkey,
526 masterkey,
527 errp) < 0) {
528 goto cleanup;
529 }
530
531
532
533
534
535
536
537
538
539
540 if (qcrypto_pbkdf2(hash,
541 masterkey, masterkeylen,
542 luks->header.master_key_salt,
543 QCRYPTO_BLOCK_LUKS_SALT_LEN,
544 luks->header.master_key_iterations,
545 keydigest, G_N_ELEMENTS(keydigest),
546 errp) < 0) {
547 goto cleanup;
548 }
549
550 if (memcmp(keydigest, luks->header.master_key_digest,
551 QCRYPTO_BLOCK_LUKS_DIGEST_LEN) == 0) {
552
553 ret = 1;
554 goto cleanup;
555 }
556
557
558
559 ret = 0;
560
561 cleanup:
562 qcrypto_ivgen_free(ivgen);
563 qcrypto_cipher_free(cipher);
564 g_free(splitkey);
565 g_free(possiblekey);
566 return ret;
567}
568
569
570
571
572
573
574
575
576
577static int
578qcrypto_block_luks_find_key(QCryptoBlock *block,
579 const char *password,
580 QCryptoCipherAlgorithm cipheralg,
581 QCryptoCipherMode ciphermode,
582 QCryptoHashAlgorithm hash,
583 QCryptoIVGenAlgorithm ivalg,
584 QCryptoCipherAlgorithm ivcipheralg,
585 QCryptoHashAlgorithm ivhash,
586 uint8_t **masterkey,
587 size_t *masterkeylen,
588 QCryptoBlockReadFunc readfunc,
589 void *opaque,
590 Error **errp)
591{
592 QCryptoBlockLUKS *luks = block->opaque;
593 size_t i;
594 int rv;
595
596 *masterkey = g_new0(uint8_t, luks->header.key_bytes);
597 *masterkeylen = luks->header.key_bytes;
598
599 for (i = 0; i < QCRYPTO_BLOCK_LUKS_NUM_KEY_SLOTS; i++) {
600 rv = qcrypto_block_luks_load_key(block,
601 &luks->header.key_slots[i],
602 password,
603 cipheralg,
604 ciphermode,
605 hash,
606 ivalg,
607 ivcipheralg,
608 ivhash,
609 *masterkey,
610 *masterkeylen,
611 readfunc,
612 opaque,
613 errp);
614 if (rv < 0) {
615 goto error;
616 }
617 if (rv == 1) {
618 return 0;
619 }
620 }
621
622 error_setg(errp, "Invalid password, cannot unlock any keyslot");
623
624 error:
625 g_free(*masterkey);
626 *masterkey = NULL;
627 *masterkeylen = 0;
628 return -1;
629}
630
631
632static int
633qcrypto_block_luks_open(QCryptoBlock *block,
634 QCryptoBlockOpenOptions *options,
635 const char *optprefix,
636 QCryptoBlockReadFunc readfunc,
637 void *opaque,
638 unsigned int flags,
639 Error **errp)
640{
641 QCryptoBlockLUKS *luks;
642 Error *local_err = NULL;
643 int ret = 0;
644 size_t i;
645 ssize_t rv;
646 uint8_t *masterkey = NULL;
647 size_t masterkeylen;
648 char *ivgen_name, *ivhash_name;
649 QCryptoCipherMode ciphermode;
650 QCryptoCipherAlgorithm cipheralg;
651 QCryptoIVGenAlgorithm ivalg;
652 QCryptoCipherAlgorithm ivcipheralg;
653 QCryptoHashAlgorithm hash;
654 QCryptoHashAlgorithm ivhash;
655 char *password = NULL;
656
657 if (!(flags & QCRYPTO_BLOCK_OPEN_NO_IO)) {
658 if (!options->u.luks.key_secret) {
659 error_setg(errp, "Parameter '%skey-secret' is required for cipher",
660 optprefix ? optprefix : "");
661 return -1;
662 }
663 password = qcrypto_secret_lookup_as_utf8(
664 options->u.luks.key_secret, errp);
665 if (!password) {
666 return -1;
667 }
668 }
669
670 luks = g_new0(QCryptoBlockLUKS, 1);
671 block->opaque = luks;
672
673
674
675 rv = readfunc(block, 0,
676 (uint8_t *)&luks->header,
677 sizeof(luks->header),
678 opaque,
679 errp);
680 if (rv < 0) {
681 ret = rv;
682 goto fail;
683 }
684
685
686
687 be16_to_cpus(&luks->header.version);
688 be32_to_cpus(&luks->header.payload_offset);
689 be32_to_cpus(&luks->header.key_bytes);
690 be32_to_cpus(&luks->header.master_key_iterations);
691
692 for (i = 0; i < QCRYPTO_BLOCK_LUKS_NUM_KEY_SLOTS; i++) {
693 be32_to_cpus(&luks->header.key_slots[i].active);
694 be32_to_cpus(&luks->header.key_slots[i].iterations);
695 be32_to_cpus(&luks->header.key_slots[i].key_offset);
696 be32_to_cpus(&luks->header.key_slots[i].stripes);
697 }
698
699 if (memcmp(luks->header.magic, qcrypto_block_luks_magic,
700 QCRYPTO_BLOCK_LUKS_MAGIC_LEN) != 0) {
701 error_setg(errp, "Volume is not in LUKS format");
702 ret = -EINVAL;
703 goto fail;
704 }
705 if (luks->header.version != QCRYPTO_BLOCK_LUKS_VERSION) {
706 error_setg(errp, "LUKS version %" PRIu32 " is not supported",
707 luks->header.version);
708 ret = -ENOTSUP;
709 goto fail;
710 }
711
712
713
714
715
716
717
718
719
720 ivgen_name = strchr(luks->header.cipher_mode, '-');
721 if (!ivgen_name) {
722 ret = -EINVAL;
723 error_setg(errp, "Unexpected cipher mode string format %s",
724 luks->header.cipher_mode);
725 goto fail;
726 }
727 *ivgen_name = '\0';
728 ivgen_name++;
729
730 ivhash_name = strchr(ivgen_name, ':');
731 if (!ivhash_name) {
732 ivhash = 0;
733 } else {
734 *ivhash_name = '\0';
735 ivhash_name++;
736
737 ivhash = qcrypto_block_luks_hash_name_lookup(ivhash_name,
738 &local_err);
739 if (local_err) {
740 ret = -ENOTSUP;
741 error_propagate(errp, local_err);
742 goto fail;
743 }
744 }
745
746 ciphermode = qcrypto_block_luks_cipher_mode_lookup(luks->header.cipher_mode,
747 &local_err);
748 if (local_err) {
749 ret = -ENOTSUP;
750 error_propagate(errp, local_err);
751 goto fail;
752 }
753
754 cipheralg = qcrypto_block_luks_cipher_name_lookup(luks->header.cipher_name,
755 ciphermode,
756 luks->header.key_bytes,
757 &local_err);
758 if (local_err) {
759 ret = -ENOTSUP;
760 error_propagate(errp, local_err);
761 goto fail;
762 }
763
764 hash = qcrypto_block_luks_hash_name_lookup(luks->header.hash_spec,
765 &local_err);
766 if (local_err) {
767 ret = -ENOTSUP;
768 error_propagate(errp, local_err);
769 goto fail;
770 }
771
772 ivalg = qcrypto_block_luks_ivgen_name_lookup(ivgen_name,
773 &local_err);
774 if (local_err) {
775 ret = -ENOTSUP;
776 error_propagate(errp, local_err);
777 goto fail;
778 }
779
780 if (ivalg == QCRYPTO_IVGEN_ALG_ESSIV) {
781 if (!ivhash_name) {
782 ret = -EINVAL;
783 error_setg(errp, "Missing IV generator hash specification");
784 goto fail;
785 }
786 ivcipheralg = qcrypto_block_luks_essiv_cipher(cipheralg,
787 ivhash,
788 &local_err);
789 if (local_err) {
790 ret = -ENOTSUP;
791 error_propagate(errp, local_err);
792 goto fail;
793 }
794 } else {
795
796
797
798
799
800
801
802 ivcipheralg = cipheralg;
803 }
804
805 if (!(flags & QCRYPTO_BLOCK_OPEN_NO_IO)) {
806
807
808
809 if (qcrypto_block_luks_find_key(block,
810 password,
811 cipheralg, ciphermode,
812 hash,
813 ivalg,
814 ivcipheralg,
815 ivhash,
816 &masterkey, &masterkeylen,
817 readfunc, opaque,
818 errp) < 0) {
819 ret = -EACCES;
820 goto fail;
821 }
822
823
824
825
826 block->kdfhash = hash;
827 block->niv = qcrypto_cipher_get_iv_len(cipheralg,
828 ciphermode);
829 block->ivgen = qcrypto_ivgen_new(ivalg,
830 ivcipheralg,
831 ivhash,
832 masterkey, masterkeylen,
833 errp);
834 if (!block->ivgen) {
835 ret = -ENOTSUP;
836 goto fail;
837 }
838
839 block->cipher = qcrypto_cipher_new(cipheralg,
840 ciphermode,
841 masterkey, masterkeylen,
842 errp);
843 if (!block->cipher) {
844 ret = -ENOTSUP;
845 goto fail;
846 }
847 }
848
849 block->sector_size = QCRYPTO_BLOCK_LUKS_SECTOR_SIZE;
850 block->payload_offset = luks->header.payload_offset *
851 block->sector_size;
852
853 luks->cipher_alg = cipheralg;
854 luks->cipher_mode = ciphermode;
855 luks->ivgen_alg = ivalg;
856 luks->ivgen_hash_alg = ivhash;
857 luks->hash_alg = hash;
858
859 g_free(masterkey);
860 g_free(password);
861
862 return 0;
863
864 fail:
865 g_free(masterkey);
866 qcrypto_cipher_free(block->cipher);
867 qcrypto_ivgen_free(block->ivgen);
868 g_free(luks);
869 g_free(password);
870 return ret;
871}
872
873
874static void
875qcrypto_block_luks_uuid_gen(uint8_t *uuidstr)
876{
877 QemuUUID uuid;
878 qemu_uuid_generate(&uuid);
879 qemu_uuid_unparse(&uuid, (char *)uuidstr);
880}
881
882static int
883qcrypto_block_luks_create(QCryptoBlock *block,
884 QCryptoBlockCreateOptions *options,
885 const char *optprefix,
886 QCryptoBlockInitFunc initfunc,
887 QCryptoBlockWriteFunc writefunc,
888 void *opaque,
889 Error **errp)
890{
891 QCryptoBlockLUKS *luks;
892 QCryptoBlockCreateOptionsLUKS luks_opts;
893 Error *local_err = NULL;
894 uint8_t *masterkey = NULL;
895 uint8_t *slotkey = NULL;
896 uint8_t *splitkey = NULL;
897 size_t splitkeylen = 0;
898 size_t i;
899 QCryptoCipher *cipher = NULL;
900 QCryptoIVGen *ivgen = NULL;
901 char *password;
902 const char *cipher_alg;
903 const char *cipher_mode;
904 const char *ivgen_alg;
905 const char *ivgen_hash_alg = NULL;
906 const char *hash_alg;
907 char *cipher_mode_spec = NULL;
908 QCryptoCipherAlgorithm ivcipheralg = 0;
909 uint64_t iters;
910
911 memcpy(&luks_opts, &options->u.luks, sizeof(luks_opts));
912 if (!luks_opts.has_iter_time) {
913 luks_opts.iter_time = 2000;
914 }
915 if (!luks_opts.has_cipher_alg) {
916 luks_opts.cipher_alg = QCRYPTO_CIPHER_ALG_AES_256;
917 }
918 if (!luks_opts.has_cipher_mode) {
919 luks_opts.cipher_mode = QCRYPTO_CIPHER_MODE_XTS;
920 }
921 if (!luks_opts.has_ivgen_alg) {
922 luks_opts.ivgen_alg = QCRYPTO_IVGEN_ALG_PLAIN64;
923 }
924 if (!luks_opts.has_hash_alg) {
925 luks_opts.hash_alg = QCRYPTO_HASH_ALG_SHA256;
926 }
927 if (luks_opts.ivgen_alg == QCRYPTO_IVGEN_ALG_ESSIV) {
928 if (!luks_opts.has_ivgen_hash_alg) {
929 luks_opts.ivgen_hash_alg = QCRYPTO_HASH_ALG_SHA256;
930 luks_opts.has_ivgen_hash_alg = true;
931 }
932 }
933
934
935
936
937 if (!options->u.luks.key_secret) {
938 error_setg(errp, "Parameter '%skey-secret' is required for cipher",
939 optprefix ? optprefix : "");
940 return -1;
941 }
942 password = qcrypto_secret_lookup_as_utf8(luks_opts.key_secret, errp);
943 if (!password) {
944 return -1;
945 }
946
947 luks = g_new0(QCryptoBlockLUKS, 1);
948 block->opaque = luks;
949
950 memcpy(luks->header.magic, qcrypto_block_luks_magic,
951 QCRYPTO_BLOCK_LUKS_MAGIC_LEN);
952
953
954
955
956
957 luks->header.version = QCRYPTO_BLOCK_LUKS_VERSION;
958 qcrypto_block_luks_uuid_gen(luks->header.uuid);
959
960 cipher_alg = qcrypto_block_luks_cipher_alg_lookup(luks_opts.cipher_alg,
961 errp);
962 if (!cipher_alg) {
963 goto error;
964 }
965
966 cipher_mode = QCryptoCipherMode_str(luks_opts.cipher_mode);
967 ivgen_alg = QCryptoIVGenAlgorithm_str(luks_opts.ivgen_alg);
968 if (luks_opts.has_ivgen_hash_alg) {
969 ivgen_hash_alg = QCryptoHashAlgorithm_str(luks_opts.ivgen_hash_alg);
970 cipher_mode_spec = g_strdup_printf("%s-%s:%s", cipher_mode, ivgen_alg,
971 ivgen_hash_alg);
972 } else {
973 cipher_mode_spec = g_strdup_printf("%s-%s", cipher_mode, ivgen_alg);
974 }
975 hash_alg = QCryptoHashAlgorithm_str(luks_opts.hash_alg);
976
977
978 if (strlen(cipher_alg) >= QCRYPTO_BLOCK_LUKS_CIPHER_NAME_LEN) {
979 error_setg(errp, "Cipher name '%s' is too long for LUKS header",
980 cipher_alg);
981 goto error;
982 }
983 if (strlen(cipher_mode_spec) >= QCRYPTO_BLOCK_LUKS_CIPHER_MODE_LEN) {
984 error_setg(errp, "Cipher mode '%s' is too long for LUKS header",
985 cipher_mode_spec);
986 goto error;
987 }
988 if (strlen(hash_alg) >= QCRYPTO_BLOCK_LUKS_HASH_SPEC_LEN) {
989 error_setg(errp, "Hash name '%s' is too long for LUKS header",
990 hash_alg);
991 goto error;
992 }
993
994 if (luks_opts.ivgen_alg == QCRYPTO_IVGEN_ALG_ESSIV) {
995 ivcipheralg = qcrypto_block_luks_essiv_cipher(luks_opts.cipher_alg,
996 luks_opts.ivgen_hash_alg,
997 &local_err);
998 if (local_err) {
999 error_propagate(errp, local_err);
1000 goto error;
1001 }
1002 } else {
1003 ivcipheralg = luks_opts.cipher_alg;
1004 }
1005
1006 strcpy(luks->header.cipher_name, cipher_alg);
1007 strcpy(luks->header.cipher_mode, cipher_mode_spec);
1008 strcpy(luks->header.hash_spec, hash_alg);
1009
1010 luks->header.key_bytes = qcrypto_cipher_get_key_len(luks_opts.cipher_alg);
1011 if (luks_opts.cipher_mode == QCRYPTO_CIPHER_MODE_XTS) {
1012 luks->header.key_bytes *= 2;
1013 }
1014
1015
1016
1017
1018 if (qcrypto_random_bytes(luks->header.master_key_salt,
1019 QCRYPTO_BLOCK_LUKS_SALT_LEN,
1020 errp) < 0) {
1021 goto error;
1022 }
1023
1024
1025 masterkey = g_new0(uint8_t, luks->header.key_bytes);
1026 if (qcrypto_random_bytes(masterkey,
1027 luks->header.key_bytes, errp) < 0) {
1028 goto error;
1029 }
1030
1031
1032
1033 block->cipher = qcrypto_cipher_new(luks_opts.cipher_alg,
1034 luks_opts.cipher_mode,
1035 masterkey, luks->header.key_bytes,
1036 errp);
1037 if (!block->cipher) {
1038 goto error;
1039 }
1040
1041 block->kdfhash = luks_opts.hash_alg;
1042 block->niv = qcrypto_cipher_get_iv_len(luks_opts.cipher_alg,
1043 luks_opts.cipher_mode);
1044 block->ivgen = qcrypto_ivgen_new(luks_opts.ivgen_alg,
1045 ivcipheralg,
1046 luks_opts.ivgen_hash_alg,
1047 masterkey, luks->header.key_bytes,
1048 errp);
1049
1050 if (!block->ivgen) {
1051 goto error;
1052 }
1053
1054
1055
1056
1057
1058 iters = qcrypto_pbkdf2_count_iters(luks_opts.hash_alg,
1059 masterkey, luks->header.key_bytes,
1060 luks->header.master_key_salt,
1061 QCRYPTO_BLOCK_LUKS_SALT_LEN,
1062 QCRYPTO_BLOCK_LUKS_DIGEST_LEN,
1063 &local_err);
1064 if (local_err) {
1065 error_propagate(errp, local_err);
1066 goto error;
1067 }
1068
1069 if (iters > (ULLONG_MAX / luks_opts.iter_time)) {
1070 error_setg_errno(errp, ERANGE,
1071 "PBKDF iterations %llu too large to scale",
1072 (unsigned long long)iters);
1073 goto error;
1074 }
1075
1076
1077 iters = iters * luks_opts.iter_time / 1000;
1078
1079
1080
1081
1082
1083 iters /= 8;
1084 if (iters > UINT32_MAX) {
1085 error_setg_errno(errp, ERANGE,
1086 "PBKDF iterations %llu larger than %u",
1087 (unsigned long long)iters, UINT32_MAX);
1088 goto error;
1089 }
1090 iters = MAX(iters, QCRYPTO_BLOCK_LUKS_MIN_MASTER_KEY_ITERS);
1091 luks->header.master_key_iterations = iters;
1092
1093
1094
1095
1096
1097
1098 if (qcrypto_pbkdf2(luks_opts.hash_alg,
1099 masterkey, luks->header.key_bytes,
1100 luks->header.master_key_salt,
1101 QCRYPTO_BLOCK_LUKS_SALT_LEN,
1102 luks->header.master_key_iterations,
1103 luks->header.master_key_digest,
1104 QCRYPTO_BLOCK_LUKS_DIGEST_LEN,
1105 errp) < 0) {
1106 goto error;
1107 }
1108
1109
1110
1111
1112 splitkeylen = luks->header.key_bytes * QCRYPTO_BLOCK_LUKS_STRIPES;
1113 for (i = 0; i < QCRYPTO_BLOCK_LUKS_NUM_KEY_SLOTS; i++) {
1114 luks->header.key_slots[i].active = i == 0 ?
1115 QCRYPTO_BLOCK_LUKS_KEY_SLOT_ENABLED :
1116 QCRYPTO_BLOCK_LUKS_KEY_SLOT_DISABLED;
1117 luks->header.key_slots[i].stripes = QCRYPTO_BLOCK_LUKS_STRIPES;
1118
1119
1120
1121
1122 luks->header.key_slots[i].key_offset =
1123 (QCRYPTO_BLOCK_LUKS_KEY_SLOT_OFFSET /
1124 QCRYPTO_BLOCK_LUKS_SECTOR_SIZE) +
1125 (ROUND_UP(DIV_ROUND_UP(splitkeylen, QCRYPTO_BLOCK_LUKS_SECTOR_SIZE),
1126 (QCRYPTO_BLOCK_LUKS_KEY_SLOT_OFFSET /
1127 QCRYPTO_BLOCK_LUKS_SECTOR_SIZE)) * i);
1128 }
1129
1130 if (qcrypto_random_bytes(luks->header.key_slots[0].salt,
1131 QCRYPTO_BLOCK_LUKS_SALT_LEN,
1132 errp) < 0) {
1133 goto error;
1134 }
1135
1136
1137
1138
1139 iters = qcrypto_pbkdf2_count_iters(luks_opts.hash_alg,
1140 (uint8_t *)password, strlen(password),
1141 luks->header.key_slots[0].salt,
1142 QCRYPTO_BLOCK_LUKS_SALT_LEN,
1143 luks->header.key_bytes,
1144 &local_err);
1145 if (local_err) {
1146 error_propagate(errp, local_err);
1147 goto error;
1148 }
1149
1150 if (iters > (ULLONG_MAX / luks_opts.iter_time)) {
1151 error_setg_errno(errp, ERANGE,
1152 "PBKDF iterations %llu too large to scale",
1153 (unsigned long long)iters);
1154 goto error;
1155 }
1156
1157
1158 iters = iters * luks_opts.iter_time / 1000;
1159
1160 if (iters > UINT32_MAX) {
1161 error_setg_errno(errp, ERANGE,
1162 "PBKDF iterations %llu larger than %u",
1163 (unsigned long long)iters, UINT32_MAX);
1164 goto error;
1165 }
1166
1167 luks->header.key_slots[0].iterations =
1168 MAX(iters, QCRYPTO_BLOCK_LUKS_MIN_SLOT_KEY_ITERS);
1169
1170
1171
1172
1173
1174 slotkey = g_new0(uint8_t, luks->header.key_bytes);
1175 if (qcrypto_pbkdf2(luks_opts.hash_alg,
1176 (uint8_t *)password, strlen(password),
1177 luks->header.key_slots[0].salt,
1178 QCRYPTO_BLOCK_LUKS_SALT_LEN,
1179 luks->header.key_slots[0].iterations,
1180 slotkey, luks->header.key_bytes,
1181 errp) < 0) {
1182 goto error;
1183 }
1184
1185
1186
1187
1188
1189 cipher = qcrypto_cipher_new(luks_opts.cipher_alg,
1190 luks_opts.cipher_mode,
1191 slotkey, luks->header.key_bytes,
1192 errp);
1193 if (!cipher) {
1194 goto error;
1195 }
1196
1197 ivgen = qcrypto_ivgen_new(luks_opts.ivgen_alg,
1198 ivcipheralg,
1199 luks_opts.ivgen_hash_alg,
1200 slotkey, luks->header.key_bytes,
1201 errp);
1202 if (!ivgen) {
1203 goto error;
1204 }
1205
1206
1207
1208
1209 splitkey = g_new0(uint8_t, splitkeylen);
1210
1211 if (qcrypto_afsplit_encode(luks_opts.hash_alg,
1212 luks->header.key_bytes,
1213 luks->header.key_slots[0].stripes,
1214 masterkey,
1215 splitkey,
1216 errp) < 0) {
1217 goto error;
1218 }
1219
1220
1221
1222 if (qcrypto_block_encrypt_helper(cipher, block->niv, ivgen,
1223 QCRYPTO_BLOCK_LUKS_SECTOR_SIZE,
1224 0,
1225 splitkey,
1226 splitkeylen,
1227 errp) < 0) {
1228 goto error;
1229 }
1230
1231
1232
1233
1234
1235
1236 luks->header.payload_offset =
1237 (QCRYPTO_BLOCK_LUKS_KEY_SLOT_OFFSET /
1238 QCRYPTO_BLOCK_LUKS_SECTOR_SIZE) +
1239 (ROUND_UP(DIV_ROUND_UP(splitkeylen, QCRYPTO_BLOCK_LUKS_SECTOR_SIZE),
1240 (QCRYPTO_BLOCK_LUKS_KEY_SLOT_OFFSET /
1241 QCRYPTO_BLOCK_LUKS_SECTOR_SIZE)) *
1242 QCRYPTO_BLOCK_LUKS_NUM_KEY_SLOTS);
1243
1244 block->sector_size = QCRYPTO_BLOCK_LUKS_SECTOR_SIZE;
1245 block->payload_offset = luks->header.payload_offset *
1246 block->sector_size;
1247
1248
1249 initfunc(block, block->payload_offset, opaque, &local_err);
1250 if (local_err) {
1251 error_propagate(errp, local_err);
1252 goto error;
1253 }
1254
1255
1256
1257 cpu_to_be16s(&luks->header.version);
1258 cpu_to_be32s(&luks->header.payload_offset);
1259 cpu_to_be32s(&luks->header.key_bytes);
1260 cpu_to_be32s(&luks->header.master_key_iterations);
1261
1262 for (i = 0; i < QCRYPTO_BLOCK_LUKS_NUM_KEY_SLOTS; i++) {
1263 cpu_to_be32s(&luks->header.key_slots[i].active);
1264 cpu_to_be32s(&luks->header.key_slots[i].iterations);
1265 cpu_to_be32s(&luks->header.key_slots[i].key_offset);
1266 cpu_to_be32s(&luks->header.key_slots[i].stripes);
1267 }
1268
1269
1270
1271 writefunc(block, 0,
1272 (const uint8_t *)&luks->header,
1273 sizeof(luks->header),
1274 opaque,
1275 &local_err);
1276
1277
1278
1279
1280
1281 be16_to_cpus(&luks->header.version);
1282 be32_to_cpus(&luks->header.payload_offset);
1283 be32_to_cpus(&luks->header.key_bytes);
1284 be32_to_cpus(&luks->header.master_key_iterations);
1285
1286 for (i = 0; i < QCRYPTO_BLOCK_LUKS_NUM_KEY_SLOTS; i++) {
1287 be32_to_cpus(&luks->header.key_slots[i].active);
1288 be32_to_cpus(&luks->header.key_slots[i].iterations);
1289 be32_to_cpus(&luks->header.key_slots[i].key_offset);
1290 be32_to_cpus(&luks->header.key_slots[i].stripes);
1291 }
1292
1293 if (local_err) {
1294 error_propagate(errp, local_err);
1295 goto error;
1296 }
1297
1298
1299
1300 if (writefunc(block,
1301 luks->header.key_slots[0].key_offset *
1302 QCRYPTO_BLOCK_LUKS_SECTOR_SIZE,
1303 splitkey, splitkeylen,
1304 opaque,
1305 errp) != splitkeylen) {
1306 goto error;
1307 }
1308
1309 luks->cipher_alg = luks_opts.cipher_alg;
1310 luks->cipher_mode = luks_opts.cipher_mode;
1311 luks->ivgen_alg = luks_opts.ivgen_alg;
1312 luks->ivgen_hash_alg = luks_opts.ivgen_hash_alg;
1313 luks->hash_alg = luks_opts.hash_alg;
1314
1315 memset(masterkey, 0, luks->header.key_bytes);
1316 g_free(masterkey);
1317 memset(slotkey, 0, luks->header.key_bytes);
1318 g_free(slotkey);
1319 g_free(splitkey);
1320 g_free(password);
1321 g_free(cipher_mode_spec);
1322
1323 qcrypto_ivgen_free(ivgen);
1324 qcrypto_cipher_free(cipher);
1325
1326 return 0;
1327
1328 error:
1329 if (masterkey) {
1330 memset(masterkey, 0, luks->header.key_bytes);
1331 }
1332 g_free(masterkey);
1333 if (slotkey) {
1334 memset(slotkey, 0, luks->header.key_bytes);
1335 }
1336 g_free(slotkey);
1337 g_free(splitkey);
1338 g_free(password);
1339 g_free(cipher_mode_spec);
1340
1341 qcrypto_ivgen_free(ivgen);
1342 qcrypto_cipher_free(cipher);
1343
1344 g_free(luks);
1345 return -1;
1346}
1347
1348
1349static int qcrypto_block_luks_get_info(QCryptoBlock *block,
1350 QCryptoBlockInfo *info,
1351 Error **errp)
1352{
1353 QCryptoBlockLUKS *luks = block->opaque;
1354 QCryptoBlockInfoLUKSSlot *slot;
1355 QCryptoBlockInfoLUKSSlotList *slots = NULL, **prev = &info->u.luks.slots;
1356 size_t i;
1357
1358 info->u.luks.cipher_alg = luks->cipher_alg;
1359 info->u.luks.cipher_mode = luks->cipher_mode;
1360 info->u.luks.ivgen_alg = luks->ivgen_alg;
1361 if (info->u.luks.ivgen_alg == QCRYPTO_IVGEN_ALG_ESSIV) {
1362 info->u.luks.has_ivgen_hash_alg = true;
1363 info->u.luks.ivgen_hash_alg = luks->ivgen_hash_alg;
1364 }
1365 info->u.luks.hash_alg = luks->hash_alg;
1366 info->u.luks.payload_offset = block->payload_offset;
1367 info->u.luks.master_key_iters = luks->header.master_key_iterations;
1368 info->u.luks.uuid = g_strndup((const char *)luks->header.uuid,
1369 sizeof(luks->header.uuid));
1370
1371 for (i = 0; i < QCRYPTO_BLOCK_LUKS_NUM_KEY_SLOTS; i++) {
1372 slots = g_new0(QCryptoBlockInfoLUKSSlotList, 1);
1373 *prev = slots;
1374
1375 slots->value = slot = g_new0(QCryptoBlockInfoLUKSSlot, 1);
1376 slot->active = luks->header.key_slots[i].active ==
1377 QCRYPTO_BLOCK_LUKS_KEY_SLOT_ENABLED;
1378 slot->key_offset = luks->header.key_slots[i].key_offset
1379 * QCRYPTO_BLOCK_LUKS_SECTOR_SIZE;
1380 if (slot->active) {
1381 slot->has_iters = true;
1382 slot->iters = luks->header.key_slots[i].iterations;
1383 slot->has_stripes = true;
1384 slot->stripes = luks->header.key_slots[i].stripes;
1385 }
1386
1387 prev = &slots->next;
1388 }
1389
1390 return 0;
1391}
1392
1393
1394static void qcrypto_block_luks_cleanup(QCryptoBlock *block)
1395{
1396 g_free(block->opaque);
1397}
1398
1399
1400static int
1401qcrypto_block_luks_decrypt(QCryptoBlock *block,
1402 uint64_t offset,
1403 uint8_t *buf,
1404 size_t len,
1405 Error **errp)
1406{
1407 assert(QEMU_IS_ALIGNED(offset, QCRYPTO_BLOCK_LUKS_SECTOR_SIZE));
1408 assert(QEMU_IS_ALIGNED(len, QCRYPTO_BLOCK_LUKS_SECTOR_SIZE));
1409 return qcrypto_block_decrypt_helper(block->cipher,
1410 block->niv, block->ivgen,
1411 QCRYPTO_BLOCK_LUKS_SECTOR_SIZE,
1412 offset, buf, len, errp);
1413}
1414
1415
1416static int
1417qcrypto_block_luks_encrypt(QCryptoBlock *block,
1418 uint64_t offset,
1419 uint8_t *buf,
1420 size_t len,
1421 Error **errp)
1422{
1423 assert(QEMU_IS_ALIGNED(offset, QCRYPTO_BLOCK_LUKS_SECTOR_SIZE));
1424 assert(QEMU_IS_ALIGNED(len, QCRYPTO_BLOCK_LUKS_SECTOR_SIZE));
1425 return qcrypto_block_encrypt_helper(block->cipher,
1426 block->niv, block->ivgen,
1427 QCRYPTO_BLOCK_LUKS_SECTOR_SIZE,
1428 offset, buf, len, errp);
1429}
1430
1431
1432const QCryptoBlockDriver qcrypto_block_driver_luks = {
1433 .open = qcrypto_block_luks_open,
1434 .create = qcrypto_block_luks_create,
1435 .get_info = qcrypto_block_luks_get_info,
1436 .cleanup = qcrypto_block_luks_cleanup,
1437 .decrypt = qcrypto_block_luks_decrypt,
1438 .encrypt = qcrypto_block_luks_encrypt,
1439 .has_format = qcrypto_block_luks_has_format,
1440};
1441