1 /*- 2 * Copyright (c) 2005-2011 Pawel Jakub Dawidek <pawel@dawidek.net> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD$ 27 */ 28 29 #ifndef _G_ELI_H_ 30 #define _G_ELI_H_ 31 32 #include <sys/endian.h> 33 #include <sys/errno.h> 34 #include <sys/malloc.h> 35 #include <crypto/sha2/sha256.h> 36 #include <crypto/sha2/sha512.h> 37 #include <opencrypto/cryptodev.h> 38 #ifdef _KERNEL 39 #include <sys/bio.h> 40 #include <sys/libkern.h> 41 #include <sys/lock.h> 42 #include <sys/mutex.h> 43 #include <geom/geom.h> 44 #else 45 #include <assert.h> 46 #include <stdio.h> 47 #include <string.h> 48 #include <strings.h> 49 #endif 50 #include <sys/queue.h> 51 #include <sys/tree.h> 52 #ifndef _OpenSSL_ 53 #include <sys/md5.h> 54 #endif 55 56 #define G_ELI_CLASS_NAME "ELI" 57 #define G_ELI_MAGIC "GEOM::ELI" 58 #define G_ELI_SUFFIX ".eli" 59 60 /* 61 * Version history: 62 * 0 - Initial version number. 63 * 1 - Added data authentication support (md_aalgo field and 64 * G_ELI_FLAG_AUTH flag). 65 * 2 - Added G_ELI_FLAG_READONLY. 66 * 3 - Added 'configure' subcommand. 67 * 4 - IV is generated from offset converted to little-endian 68 * (the G_ELI_FLAG_NATIVE_BYTE_ORDER flag will be set for older versions). 69 * 5 - Added multiple encrypton keys and AES-XTS support. 70 * 6 - Fixed usage of multiple keys for authenticated providers (the 71 * G_ELI_FLAG_FIRST_KEY flag will be set for older versions). 72 * 7 - Encryption keys are now generated from the Data Key and not from the 73 * IV Key (the G_ELI_FLAG_ENC_IVKEY flag will be set for older versions). 74 */ 75 #define G_ELI_VERSION_00 0 76 #define G_ELI_VERSION_01 1 77 #define G_ELI_VERSION_02 2 78 #define G_ELI_VERSION_03 3 79 #define G_ELI_VERSION_04 4 80 #define G_ELI_VERSION_05 5 81 #define G_ELI_VERSION_06 6 82 #define G_ELI_VERSION_07 7 83 #define G_ELI_VERSION G_ELI_VERSION_07 84 85 /* ON DISK FLAGS. */ 86 /* Use random, onetime keys. */ 87 #define G_ELI_FLAG_ONETIME 0x00000001 88 /* Ask for the passphrase from the kernel, before mounting root. */ 89 #define G_ELI_FLAG_BOOT 0x00000002 90 /* Detach on last close, if we were open for writing. */ 91 #define G_ELI_FLAG_WO_DETACH 0x00000004 92 /* Detach on last close. */ 93 #define G_ELI_FLAG_RW_DETACH 0x00000008 94 /* Provide data authentication. */ 95 #define G_ELI_FLAG_AUTH 0x00000010 96 /* Provider is read-only, we should deny all write attempts. */ 97 #define G_ELI_FLAG_RO 0x00000020 98 /* Don't pass through BIO_DELETE requests. */ 99 #define G_ELI_FLAG_NODELETE 0x00000040 100 /* RUNTIME FLAGS. */ 101 /* Provider was open for writing. */ 102 #define G_ELI_FLAG_WOPEN 0x00010000 103 /* Destroy device. */ 104 #define G_ELI_FLAG_DESTROY 0x00020000 105 /* Provider uses native byte-order for IV generation. */ 106 #define G_ELI_FLAG_NATIVE_BYTE_ORDER 0x00040000 107 /* Provider uses single encryption key. */ 108 #define G_ELI_FLAG_SINGLE_KEY 0x00080000 109 /* Device suspended. */ 110 #define G_ELI_FLAG_SUSPEND 0x00100000 111 /* Provider uses first encryption key. */ 112 #define G_ELI_FLAG_FIRST_KEY 0x00200000 113 /* Provider uses IV-Key for encryption key generation. */ 114 #define G_ELI_FLAG_ENC_IVKEY 0x00400000 115 116 #define G_ELI_NEW_BIO 255 117 118 #define SHA512_MDLEN 64 119 #define G_ELI_AUTH_SECKEYLEN SHA256_DIGEST_LENGTH 120 121 #define G_ELI_MAXMKEYS 2 122 #define G_ELI_MAXKEYLEN 64 123 #define G_ELI_USERKEYLEN G_ELI_MAXKEYLEN 124 #define G_ELI_DATAKEYLEN G_ELI_MAXKEYLEN 125 #define G_ELI_AUTHKEYLEN G_ELI_MAXKEYLEN 126 #define G_ELI_IVKEYLEN G_ELI_MAXKEYLEN 127 #define G_ELI_SALTLEN 64 128 #define G_ELI_DATAIVKEYLEN (G_ELI_DATAKEYLEN + G_ELI_IVKEYLEN) 129 /* Data-Key, IV-Key, HMAC_SHA512(Derived-Key, Data-Key+IV-Key) */ 130 #define G_ELI_MKEYLEN (G_ELI_DATAIVKEYLEN + SHA512_MDLEN) 131 #define G_ELI_OVERWRITES 5 132 /* Switch data encryption key every 2^20 blocks. */ 133 #define G_ELI_KEY_SHIFT 20 134 135 #define G_ELI_CRYPTO_UNKNOWN 0 136 #define G_ELI_CRYPTO_HW 1 137 #define G_ELI_CRYPTO_SW 2 138 139 #ifdef _KERNEL 140 extern int g_eli_debug; 141 extern u_int g_eli_overwrites; 142 extern u_int g_eli_batch; 143 144 #define G_ELI_DEBUG(lvl, ...) do { \ 145 if (g_eli_debug >= (lvl)) { \ 146 printf("GEOM_ELI"); \ 147 if (g_eli_debug > 0) \ 148 printf("[%u]", lvl); \ 149 printf(": "); \ 150 printf(__VA_ARGS__); \ 151 printf("\n"); \ 152 } \ 153 } while (0) 154 #define G_ELI_LOGREQ(lvl, bp, ...) do { \ 155 if (g_eli_debug >= (lvl)) { \ 156 printf("GEOM_ELI"); \ 157 if (g_eli_debug > 0) \ 158 printf("[%u]", lvl); \ 159 printf(": "); \ 160 printf(__VA_ARGS__); \ 161 printf(" "); \ 162 g_print_bio(bp); \ 163 printf("\n"); \ 164 } \ 165 } while (0) 166 167 struct g_eli_worker { 168 struct g_eli_softc *w_softc; 169 struct proc *w_proc; 170 u_int w_number; 171 uint64_t w_sid; 172 boolean_t w_active; 173 LIST_ENTRY(g_eli_worker) w_next; 174 }; 175 176 #endif /* _KERNEL */ 177 178 struct g_eli_softc { 179 struct g_geom *sc_geom; 180 u_int sc_version; 181 u_int sc_crypto; 182 uint8_t sc_mkey[G_ELI_DATAIVKEYLEN]; 183 uint8_t sc_ekey[G_ELI_DATAKEYLEN]; 184 TAILQ_HEAD(, g_eli_key) sc_ekeys_queue; 185 RB_HEAD(g_eli_key_tree, g_eli_key) sc_ekeys_tree; 186 struct mtx sc_ekeys_lock; 187 uint64_t sc_ekeys_total; 188 uint64_t sc_ekeys_allocated; 189 u_int sc_ealgo; 190 u_int sc_ekeylen; 191 uint8_t sc_akey[G_ELI_AUTHKEYLEN]; 192 u_int sc_aalgo; 193 u_int sc_akeylen; 194 u_int sc_alen; 195 SHA256_CTX sc_akeyctx; 196 uint8_t sc_ivkey[G_ELI_IVKEYLEN]; 197 SHA256_CTX sc_ivctx; 198 int sc_nkey; 199 uint32_t sc_flags; 200 int sc_inflight; 201 off_t sc_mediasize; 202 size_t sc_sectorsize; 203 u_int sc_bytes_per_sector; 204 u_int sc_data_per_sector; 205 #ifndef _KERNEL 206 int sc_cpubind; 207 #else /* _KERNEL */ 208 boolean_t sc_cpubind; 209 210 /* Only for software cryptography. */ 211 struct bio_queue_head sc_queue; 212 struct mtx sc_queue_mtx; 213 LIST_HEAD(, g_eli_worker) sc_workers; 214 #endif /* _KERNEL */ 215 }; 216 #define sc_name sc_geom->name 217 218 #define G_ELI_KEY_MAGIC 0xe11341c 219 220 struct g_eli_key { 221 /* Key value, must be first in the structure. */ 222 uint8_t gek_key[G_ELI_DATAKEYLEN]; 223 /* Magic. */ 224 int gek_magic; 225 /* Key number. */ 226 uint64_t gek_keyno; 227 /* Reference counter. */ 228 int gek_count; 229 /* Keeps keys sorted by most recent use. */ 230 TAILQ_ENTRY(g_eli_key) gek_next; 231 /* Keeps keys sorted by number. */ 232 RB_ENTRY(g_eli_key) gek_link; 233 }; 234 235 struct g_eli_metadata { 236 char md_magic[16]; /* Magic value. */ 237 uint32_t md_version; /* Version number. */ 238 uint32_t md_flags; /* Additional flags. */ 239 uint16_t md_ealgo; /* Encryption algorithm. */ 240 uint16_t md_keylen; /* Key length. */ 241 uint16_t md_aalgo; /* Authentication algorithm. */ 242 uint64_t md_provsize; /* Provider's size. */ 243 uint32_t md_sectorsize; /* Sector size. */ 244 uint8_t md_keys; /* Available keys. */ 245 int32_t md_iterations; /* Number of iterations for PKCS#5v2. */ 246 uint8_t md_salt[G_ELI_SALTLEN]; /* Salt. */ 247 /* Encrypted master key (IV-key, Data-key, HMAC). */ 248 uint8_t md_mkeys[G_ELI_MAXMKEYS * G_ELI_MKEYLEN]; 249 u_char md_hash[16]; /* MD5 hash. */ 250 } __packed; 251 #ifndef _OpenSSL_ 252 static __inline void 253 eli_metadata_encode_v0(struct g_eli_metadata *md, u_char **datap) 254 { 255 u_char *p; 256 257 p = *datap; 258 le32enc(p, md->md_flags); p += sizeof(md->md_flags); 259 le16enc(p, md->md_ealgo); p += sizeof(md->md_ealgo); 260 le16enc(p, md->md_keylen); p += sizeof(md->md_keylen); 261 le64enc(p, md->md_provsize); p += sizeof(md->md_provsize); 262 le32enc(p, md->md_sectorsize); p += sizeof(md->md_sectorsize); 263 *p = md->md_keys; p += sizeof(md->md_keys); 264 le32enc(p, md->md_iterations); p += sizeof(md->md_iterations); 265 bcopy(md->md_salt, p, sizeof(md->md_salt)); p += sizeof(md->md_salt); 266 bcopy(md->md_mkeys, p, sizeof(md->md_mkeys)); p += sizeof(md->md_mkeys); 267 *datap = p; 268 } 269 static __inline void 270 eli_metadata_encode_v1v2v3v4v5v6v7(struct g_eli_metadata *md, u_char **datap) 271 { 272 u_char *p; 273 274 p = *datap; 275 le32enc(p, md->md_flags); p += sizeof(md->md_flags); 276 le16enc(p, md->md_ealgo); p += sizeof(md->md_ealgo); 277 le16enc(p, md->md_keylen); p += sizeof(md->md_keylen); 278 le16enc(p, md->md_aalgo); p += sizeof(md->md_aalgo); 279 le64enc(p, md->md_provsize); p += sizeof(md->md_provsize); 280 le32enc(p, md->md_sectorsize); p += sizeof(md->md_sectorsize); 281 *p = md->md_keys; p += sizeof(md->md_keys); 282 le32enc(p, md->md_iterations); p += sizeof(md->md_iterations); 283 bcopy(md->md_salt, p, sizeof(md->md_salt)); p += sizeof(md->md_salt); 284 bcopy(md->md_mkeys, p, sizeof(md->md_mkeys)); p += sizeof(md->md_mkeys); 285 *datap = p; 286 } 287 static __inline void 288 eli_metadata_encode(struct g_eli_metadata *md, u_char *data) 289 { 290 MD5_CTX ctx; 291 u_char *p; 292 293 p = data; 294 bcopy(md->md_magic, p, sizeof(md->md_magic)); 295 p += sizeof(md->md_magic); 296 le32enc(p, md->md_version); 297 p += sizeof(md->md_version); 298 switch (md->md_version) { 299 case G_ELI_VERSION_00: 300 eli_metadata_encode_v0(md, &p); 301 break; 302 case G_ELI_VERSION_01: 303 case G_ELI_VERSION_02: 304 case G_ELI_VERSION_03: 305 case G_ELI_VERSION_04: 306 case G_ELI_VERSION_05: 307 case G_ELI_VERSION_06: 308 case G_ELI_VERSION_07: 309 eli_metadata_encode_v1v2v3v4v5v6v7(md, &p); 310 break; 311 default: 312 #ifdef _KERNEL 313 panic("%s: Unsupported version %u.", __func__, 314 (u_int)md->md_version); 315 #else 316 assert(!"Unsupported metadata version."); 317 #endif 318 } 319 MD5Init(&ctx); 320 MD5Update(&ctx, data, p - data); 321 MD5Final(md->md_hash, &ctx); 322 bcopy(md->md_hash, p, sizeof(md->md_hash)); 323 } 324 static __inline int 325 eli_metadata_decode_v0(const u_char *data, struct g_eli_metadata *md) 326 { 327 MD5_CTX ctx; 328 const u_char *p; 329 330 p = data + sizeof(md->md_magic) + sizeof(md->md_version); 331 md->md_flags = le32dec(p); p += sizeof(md->md_flags); 332 md->md_ealgo = le16dec(p); p += sizeof(md->md_ealgo); 333 md->md_keylen = le16dec(p); p += sizeof(md->md_keylen); 334 md->md_provsize = le64dec(p); p += sizeof(md->md_provsize); 335 md->md_sectorsize = le32dec(p); p += sizeof(md->md_sectorsize); 336 md->md_keys = *p; p += sizeof(md->md_keys); 337 md->md_iterations = le32dec(p); p += sizeof(md->md_iterations); 338 bcopy(p, md->md_salt, sizeof(md->md_salt)); p += sizeof(md->md_salt); 339 bcopy(p, md->md_mkeys, sizeof(md->md_mkeys)); p += sizeof(md->md_mkeys); 340 MD5Init(&ctx); 341 MD5Update(&ctx, data, p - data); 342 MD5Final(md->md_hash, &ctx); 343 if (bcmp(md->md_hash, p, 16) != 0) 344 return (EINVAL); 345 return (0); 346 } 347 348 static __inline int 349 eli_metadata_decode_v1v2v3v4v5v6v7(const u_char *data, struct g_eli_metadata *md) 350 { 351 MD5_CTX ctx; 352 const u_char *p; 353 354 p = data + sizeof(md->md_magic) + sizeof(md->md_version); 355 md->md_flags = le32dec(p); p += sizeof(md->md_flags); 356 md->md_ealgo = le16dec(p); p += sizeof(md->md_ealgo); 357 md->md_keylen = le16dec(p); p += sizeof(md->md_keylen); 358 md->md_aalgo = le16dec(p); p += sizeof(md->md_aalgo); 359 md->md_provsize = le64dec(p); p += sizeof(md->md_provsize); 360 md->md_sectorsize = le32dec(p); p += sizeof(md->md_sectorsize); 361 md->md_keys = *p; p += sizeof(md->md_keys); 362 md->md_iterations = le32dec(p); p += sizeof(md->md_iterations); 363 bcopy(p, md->md_salt, sizeof(md->md_salt)); p += sizeof(md->md_salt); 364 bcopy(p, md->md_mkeys, sizeof(md->md_mkeys)); p += sizeof(md->md_mkeys); 365 MD5Init(&ctx); 366 MD5Update(&ctx, data, p - data); 367 MD5Final(md->md_hash, &ctx); 368 if (bcmp(md->md_hash, p, 16) != 0) 369 return (EINVAL); 370 return (0); 371 } 372 static __inline int 373 eli_metadata_decode(const u_char *data, struct g_eli_metadata *md) 374 { 375 int error; 376 377 bcopy(data, md->md_magic, sizeof(md->md_magic)); 378 if (strcmp(md->md_magic, G_ELI_MAGIC) != 0) 379 return (EINVAL); 380 md->md_version = le32dec(data + sizeof(md->md_magic)); 381 switch (md->md_version) { 382 case G_ELI_VERSION_00: 383 error = eli_metadata_decode_v0(data, md); 384 break; 385 case G_ELI_VERSION_01: 386 case G_ELI_VERSION_02: 387 case G_ELI_VERSION_03: 388 case G_ELI_VERSION_04: 389 case G_ELI_VERSION_05: 390 case G_ELI_VERSION_06: 391 case G_ELI_VERSION_07: 392 error = eli_metadata_decode_v1v2v3v4v5v6v7(data, md); 393 break; 394 default: 395 error = EOPNOTSUPP; 396 break; 397 } 398 return (error); 399 } 400 #endif /* !_OpenSSL */ 401 402 static __inline u_int 403 g_eli_str2ealgo(const char *name) 404 { 405 406 if (strcasecmp("null", name) == 0) 407 return (CRYPTO_NULL_CBC); 408 else if (strcasecmp("null-cbc", name) == 0) 409 return (CRYPTO_NULL_CBC); 410 else if (strcasecmp("aes", name) == 0) 411 return (CRYPTO_AES_XTS); 412 else if (strcasecmp("aes-cbc", name) == 0) 413 return (CRYPTO_AES_CBC); 414 else if (strcasecmp("aes-xts", name) == 0) 415 return (CRYPTO_AES_XTS); 416 else if (strcasecmp("blowfish", name) == 0) 417 return (CRYPTO_BLF_CBC); 418 else if (strcasecmp("blowfish-cbc", name) == 0) 419 return (CRYPTO_BLF_CBC); 420 else if (strcasecmp("camellia", name) == 0) 421 return (CRYPTO_CAMELLIA_CBC); 422 else if (strcasecmp("camellia-cbc", name) == 0) 423 return (CRYPTO_CAMELLIA_CBC); 424 else if (strcasecmp("3des", name) == 0) 425 return (CRYPTO_3DES_CBC); 426 else if (strcasecmp("3des-cbc", name) == 0) 427 return (CRYPTO_3DES_CBC); 428 return (CRYPTO_ALGORITHM_MIN - 1); 429 } 430 431 static __inline u_int 432 g_eli_str2aalgo(const char *name) 433 { 434 435 if (strcasecmp("hmac/md5", name) == 0) 436 return (CRYPTO_MD5_HMAC); 437 else if (strcasecmp("hmac/sha1", name) == 0) 438 return (CRYPTO_SHA1_HMAC); 439 else if (strcasecmp("hmac/ripemd160", name) == 0) 440 return (CRYPTO_RIPEMD160_HMAC); 441 else if (strcasecmp("hmac/sha256", name) == 0) 442 return (CRYPTO_SHA2_256_HMAC); 443 else if (strcasecmp("hmac/sha384", name) == 0) 444 return (CRYPTO_SHA2_384_HMAC); 445 else if (strcasecmp("hmac/sha512", name) == 0) 446 return (CRYPTO_SHA2_512_HMAC); 447 return (CRYPTO_ALGORITHM_MIN - 1); 448 } 449 450 static __inline const char * 451 g_eli_algo2str(u_int algo) 452 { 453 454 switch (algo) { 455 case CRYPTO_NULL_CBC: 456 return ("NULL"); 457 case CRYPTO_AES_CBC: 458 return ("AES-CBC"); 459 case CRYPTO_AES_XTS: 460 return ("AES-XTS"); 461 case CRYPTO_BLF_CBC: 462 return ("Blowfish-CBC"); 463 case CRYPTO_CAMELLIA_CBC: 464 return ("CAMELLIA-CBC"); 465 case CRYPTO_3DES_CBC: 466 return ("3DES-CBC"); 467 case CRYPTO_MD5_HMAC: 468 return ("HMAC/MD5"); 469 case CRYPTO_SHA1_HMAC: 470 return ("HMAC/SHA1"); 471 case CRYPTO_RIPEMD160_HMAC: 472 return ("HMAC/RIPEMD160"); 473 case CRYPTO_SHA2_256_HMAC: 474 return ("HMAC/SHA256"); 475 case CRYPTO_SHA2_384_HMAC: 476 return ("HMAC/SHA384"); 477 case CRYPTO_SHA2_512_HMAC: 478 return ("HMAC/SHA512"); 479 } 480 return ("unknown"); 481 } 482 483 static __inline void 484 eli_metadata_dump(const struct g_eli_metadata *md) 485 { 486 static const char hex[] = "0123456789abcdef"; 487 char str[sizeof(md->md_mkeys) * 2 + 1]; 488 u_int i; 489 490 printf(" magic: %s\n", md->md_magic); 491 printf(" version: %u\n", (u_int)md->md_version); 492 printf(" flags: 0x%x\n", (u_int)md->md_flags); 493 printf(" ealgo: %s\n", g_eli_algo2str(md->md_ealgo)); 494 printf(" keylen: %u\n", (u_int)md->md_keylen); 495 if (md->md_flags & G_ELI_FLAG_AUTH) 496 printf(" aalgo: %s\n", g_eli_algo2str(md->md_aalgo)); 497 printf(" provsize: %ju\n", (uintmax_t)md->md_provsize); 498 printf("sectorsize: %u\n", (u_int)md->md_sectorsize); 499 printf(" keys: 0x%02x\n", (u_int)md->md_keys); 500 printf("iterations: %u\n", (u_int)md->md_iterations); 501 bzero(str, sizeof(str)); 502 for (i = 0; i < sizeof(md->md_salt); i++) { 503 str[i * 2] = hex[md->md_salt[i] >> 4]; 504 str[i * 2 + 1] = hex[md->md_salt[i] & 0x0f]; 505 } 506 printf(" Salt: %s\n", str); 507 bzero(str, sizeof(str)); 508 for (i = 0; i < sizeof(md->md_mkeys); i++) { 509 str[i * 2] = hex[md->md_mkeys[i] >> 4]; 510 str[i * 2 + 1] = hex[md->md_mkeys[i] & 0x0f]; 511 } 512 printf("Master Key: %s\n", str); 513 bzero(str, sizeof(str)); 514 for (i = 0; i < 16; i++) { 515 str[i * 2] = hex[md->md_hash[i] >> 4]; 516 str[i * 2 + 1] = hex[md->md_hash[i] & 0x0f]; 517 } 518 printf(" MD5 hash: %s\n", str); 519 } 520 521 static __inline u_int 522 g_eli_keylen(u_int algo, u_int keylen) 523 { 524 525 switch (algo) { 526 case CRYPTO_NULL_CBC: 527 if (keylen == 0) 528 keylen = 64 * 8; 529 else { 530 if (keylen > 64 * 8) 531 keylen = 0; 532 } 533 return (keylen); 534 case CRYPTO_AES_CBC: 535 case CRYPTO_CAMELLIA_CBC: 536 switch (keylen) { 537 case 0: 538 return (128); 539 case 128: 540 case 192: 541 case 256: 542 return (keylen); 543 default: 544 return (0); 545 } 546 case CRYPTO_AES_XTS: 547 switch (keylen) { 548 case 0: 549 return (128); 550 case 128: 551 case 256: 552 return (keylen); 553 default: 554 return (0); 555 } 556 case CRYPTO_BLF_CBC: 557 if (keylen == 0) 558 return (128); 559 if (keylen < 128 || keylen > 448) 560 return (0); 561 if ((keylen % 32) != 0) 562 return (0); 563 return (keylen); 564 case CRYPTO_3DES_CBC: 565 if (keylen == 0 || keylen == 192) 566 return (192); 567 return (0); 568 default: 569 return (0); 570 } 571 } 572 573 static __inline u_int 574 g_eli_hashlen(u_int algo) 575 { 576 577 switch (algo) { 578 case CRYPTO_MD5_HMAC: 579 return (16); 580 case CRYPTO_SHA1_HMAC: 581 return (20); 582 case CRYPTO_RIPEMD160_HMAC: 583 return (20); 584 case CRYPTO_SHA2_256_HMAC: 585 return (32); 586 case CRYPTO_SHA2_384_HMAC: 587 return (48); 588 case CRYPTO_SHA2_512_HMAC: 589 return (64); 590 } 591 return (0); 592 } 593 594 static __inline void 595 eli_metadata_softc(struct g_eli_softc *sc, const struct g_eli_metadata *md, 596 u_int sectorsize, off_t mediasize) 597 { 598 599 sc->sc_version = md->md_version; 600 sc->sc_inflight = 0; 601 sc->sc_crypto = G_ELI_CRYPTO_UNKNOWN; 602 sc->sc_flags = md->md_flags; 603 /* Backward compatibility. */ 604 if (md->md_version < G_ELI_VERSION_04) 605 sc->sc_flags |= G_ELI_FLAG_NATIVE_BYTE_ORDER; 606 if (md->md_version < G_ELI_VERSION_05) 607 sc->sc_flags |= G_ELI_FLAG_SINGLE_KEY; 608 if (md->md_version < G_ELI_VERSION_06 && 609 (sc->sc_flags & G_ELI_FLAG_AUTH) != 0) { 610 sc->sc_flags |= G_ELI_FLAG_FIRST_KEY; 611 } 612 if (md->md_version < G_ELI_VERSION_07) 613 sc->sc_flags |= G_ELI_FLAG_ENC_IVKEY; 614 sc->sc_ealgo = md->md_ealgo; 615 616 if (sc->sc_flags & G_ELI_FLAG_AUTH) { 617 sc->sc_akeylen = sizeof(sc->sc_akey) * 8; 618 sc->sc_aalgo = md->md_aalgo; 619 sc->sc_alen = g_eli_hashlen(sc->sc_aalgo); 620 621 sc->sc_data_per_sector = sectorsize - sc->sc_alen; 622 /* 623 * Some hash functions (like SHA1 and RIPEMD160) generates hash 624 * which length is not multiple of 128 bits, but we want data 625 * length to be multiple of 128, so we can encrypt without 626 * padding. The line below rounds down data length to multiple 627 * of 128 bits. 628 */ 629 sc->sc_data_per_sector -= sc->sc_data_per_sector % 16; 630 631 sc->sc_bytes_per_sector = 632 (md->md_sectorsize - 1) / sc->sc_data_per_sector + 1; 633 sc->sc_bytes_per_sector *= sectorsize; 634 } 635 sc->sc_sectorsize = md->md_sectorsize; 636 sc->sc_mediasize = mediasize; 637 if (!(sc->sc_flags & G_ELI_FLAG_ONETIME)) 638 sc->sc_mediasize -= sectorsize; 639 if (!(sc->sc_flags & G_ELI_FLAG_AUTH)) 640 sc->sc_mediasize -= (sc->sc_mediasize % sc->sc_sectorsize); 641 else { 642 sc->sc_mediasize /= sc->sc_bytes_per_sector; 643 sc->sc_mediasize *= sc->sc_sectorsize; 644 } 645 sc->sc_ekeylen = md->md_keylen; 646 } 647 648 #ifdef _KERNEL 649 int g_eli_read_metadata(struct g_class *mp, struct g_provider *pp, 650 struct g_eli_metadata *md); 651 struct g_geom *g_eli_create(struct gctl_req *req, struct g_class *mp, 652 struct g_provider *bpp, const struct g_eli_metadata *md, 653 const u_char *mkey, int nkey); 654 int g_eli_destroy(struct g_eli_softc *sc, boolean_t force); 655 656 int g_eli_access(struct g_provider *pp, int dr, int dw, int de); 657 void g_eli_config(struct gctl_req *req, struct g_class *mp, const char *verb); 658 659 void g_eli_read_done(struct bio *bp); 660 void g_eli_write_done(struct bio *bp); 661 int g_eli_crypto_rerun(struct cryptop *crp); 662 663 void g_eli_crypto_read(struct g_eli_softc *sc, struct bio *bp, boolean_t fromworker); 664 void g_eli_crypto_run(struct g_eli_worker *wr, struct bio *bp); 665 666 void g_eli_auth_read(struct g_eli_softc *sc, struct bio *bp); 667 void g_eli_auth_run(struct g_eli_worker *wr, struct bio *bp); 668 #endif 669 void g_eli_crypto_ivgen(struct g_eli_softc *sc, off_t offset, u_char *iv, 670 size_t size); 671 672 void g_eli_mkey_hmac(unsigned char *mkey, const unsigned char *key); 673 int g_eli_mkey_decrypt(const struct g_eli_metadata *md, 674 const unsigned char *key, unsigned char *mkey, unsigned *nkeyp); 675 int g_eli_mkey_encrypt(unsigned algo, const unsigned char *key, unsigned keylen, 676 unsigned char *mkey); 677 #ifdef _KERNEL 678 void g_eli_mkey_propagate(struct g_eli_softc *sc, const unsigned char *mkey); 679 #endif 680 681 int g_eli_crypto_encrypt(u_int algo, u_char *data, size_t datasize, 682 const u_char *key, size_t keysize); 683 int g_eli_crypto_decrypt(u_int algo, u_char *data, size_t datasize, 684 const u_char *key, size_t keysize); 685 686 struct hmac_ctx { 687 SHA512_CTX shactx; 688 u_char k_opad[128]; 689 }; 690 691 void g_eli_crypto_hmac_init(struct hmac_ctx *ctx, const uint8_t *hkey, 692 size_t hkeylen); 693 void g_eli_crypto_hmac_update(struct hmac_ctx *ctx, const uint8_t *data, 694 size_t datasize); 695 void g_eli_crypto_hmac_final(struct hmac_ctx *ctx, uint8_t *md, size_t mdsize); 696 void g_eli_crypto_hmac(const uint8_t *hkey, size_t hkeysize, 697 const uint8_t *data, size_t datasize, uint8_t *md, size_t mdsize); 698 699 void g_eli_key_fill(struct g_eli_softc *sc, struct g_eli_key *key, 700 uint64_t keyno); 701 #ifdef _KERNEL 702 void g_eli_key_init(struct g_eli_softc *sc); 703 void g_eli_key_destroy(struct g_eli_softc *sc); 704 uint8_t *g_eli_key_hold(struct g_eli_softc *sc, off_t offset, size_t blocksize); 705 void g_eli_key_drop(struct g_eli_softc *sc, uint8_t *rawkey); 706 #endif 707 #endif /* !_G_ELI_H_ */ 708