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 #include <crypto/intake.h> 45 #else 46 #include <assert.h> 47 #include <stdio.h> 48 #include <string.h> 49 #include <strings.h> 50 #endif 51 #include <sys/queue.h> 52 #include <sys/tree.h> 53 #ifndef _OpenSSL_ 54 #include <sys/md5.h> 55 #endif 56 57 #define G_ELI_CLASS_NAME "ELI" 58 #define G_ELI_MAGIC "GEOM::ELI" 59 #define G_ELI_SUFFIX ".eli" 60 61 /* 62 * Version history: 63 * 0 - Initial version number. 64 * 1 - Added data authentication support (md_aalgo field and 65 * G_ELI_FLAG_AUTH flag). 66 * 2 - Added G_ELI_FLAG_READONLY. 67 * 3 - Added 'configure' subcommand. 68 * 4 - IV is generated from offset converted to little-endian 69 * (the G_ELI_FLAG_NATIVE_BYTE_ORDER flag will be set for older versions). 70 * 5 - Added multiple encrypton keys and AES-XTS support. 71 * 6 - Fixed usage of multiple keys for authenticated providers (the 72 * G_ELI_FLAG_FIRST_KEY flag will be set for older versions). 73 * 7 - Encryption keys are now generated from the Data Key and not from the 74 * IV Key (the G_ELI_FLAG_ENC_IVKEY flag will be set for older versions). 75 */ 76 #define G_ELI_VERSION_00 0 77 #define G_ELI_VERSION_01 1 78 #define G_ELI_VERSION_02 2 79 #define G_ELI_VERSION_03 3 80 #define G_ELI_VERSION_04 4 81 #define G_ELI_VERSION_05 5 82 #define G_ELI_VERSION_06 6 83 #define G_ELI_VERSION_07 7 84 #define G_ELI_VERSION G_ELI_VERSION_07 85 86 /* ON DISK FLAGS. */ 87 /* Use random, onetime keys. */ 88 #define G_ELI_FLAG_ONETIME 0x00000001 89 /* Ask for the passphrase from the kernel, before mounting root. */ 90 #define G_ELI_FLAG_BOOT 0x00000002 91 /* Detach on last close, if we were open for writing. */ 92 #define G_ELI_FLAG_WO_DETACH 0x00000004 93 /* Detach on last close. */ 94 #define G_ELI_FLAG_RW_DETACH 0x00000008 95 /* Provide data authentication. */ 96 #define G_ELI_FLAG_AUTH 0x00000010 97 /* Provider is read-only, we should deny all write attempts. */ 98 #define G_ELI_FLAG_RO 0x00000020 99 /* Don't pass through BIO_DELETE requests. */ 100 #define G_ELI_FLAG_NODELETE 0x00000040 101 /* This GELI supports GELIBoot */ 102 #define G_ELI_FLAG_GELIBOOT 0x00000080 103 /* RUNTIME FLAGS. */ 104 /* Provider was open for writing. */ 105 #define G_ELI_FLAG_WOPEN 0x00010000 106 /* Destroy device. */ 107 #define G_ELI_FLAG_DESTROY 0x00020000 108 /* Provider uses native byte-order for IV generation. */ 109 #define G_ELI_FLAG_NATIVE_BYTE_ORDER 0x00040000 110 /* Provider uses single encryption key. */ 111 #define G_ELI_FLAG_SINGLE_KEY 0x00080000 112 /* Device suspended. */ 113 #define G_ELI_FLAG_SUSPEND 0x00100000 114 /* Provider uses first encryption key. */ 115 #define G_ELI_FLAG_FIRST_KEY 0x00200000 116 /* Provider uses IV-Key for encryption key generation. */ 117 #define G_ELI_FLAG_ENC_IVKEY 0x00400000 118 119 #define G_ELI_NEW_BIO 255 120 121 #define SHA512_MDLEN 64 122 #define G_ELI_AUTH_SECKEYLEN SHA256_DIGEST_LENGTH 123 124 #define G_ELI_MAXMKEYS 2 125 #define G_ELI_MAXKEYLEN 64 126 #define G_ELI_USERKEYLEN G_ELI_MAXKEYLEN 127 #define G_ELI_DATAKEYLEN G_ELI_MAXKEYLEN 128 #define G_ELI_AUTHKEYLEN G_ELI_MAXKEYLEN 129 #define G_ELI_IVKEYLEN G_ELI_MAXKEYLEN 130 #define G_ELI_SALTLEN 64 131 #define G_ELI_DATAIVKEYLEN (G_ELI_DATAKEYLEN + G_ELI_IVKEYLEN) 132 /* Data-Key, IV-Key, HMAC_SHA512(Derived-Key, Data-Key+IV-Key) */ 133 #define G_ELI_MKEYLEN (G_ELI_DATAIVKEYLEN + SHA512_MDLEN) 134 #define G_ELI_OVERWRITES 5 135 /* Switch data encryption key every 2^20 blocks. */ 136 #define G_ELI_KEY_SHIFT 20 137 138 #define G_ELI_CRYPTO_UNKNOWN 0 139 #define G_ELI_CRYPTO_HW 1 140 #define G_ELI_CRYPTO_SW 2 141 142 #ifdef _KERNEL 143 #if (MAX_KEY_BYTES < G_ELI_DATAIVKEYLEN) 144 #error "MAX_KEY_BYTES is less than G_ELI_DATAKEYLEN" 145 #endif 146 147 extern int g_eli_debug; 148 extern u_int g_eli_overwrites; 149 extern u_int g_eli_batch; 150 151 #define G_ELI_DEBUG(lvl, ...) do { \ 152 if (g_eli_debug >= (lvl)) { \ 153 printf("GEOM_ELI"); \ 154 if (g_eli_debug > 0) \ 155 printf("[%u]", lvl); \ 156 printf(": "); \ 157 printf(__VA_ARGS__); \ 158 printf("\n"); \ 159 } \ 160 } while (0) 161 #define G_ELI_LOGREQ(lvl, bp, ...) do { \ 162 if (g_eli_debug >= (lvl)) { \ 163 printf("GEOM_ELI"); \ 164 if (g_eli_debug > 0) \ 165 printf("[%u]", lvl); \ 166 printf(": "); \ 167 printf(__VA_ARGS__); \ 168 printf(" "); \ 169 g_print_bio(bp); \ 170 printf("\n"); \ 171 } \ 172 } while (0) 173 174 struct g_eli_worker { 175 struct g_eli_softc *w_softc; 176 struct proc *w_proc; 177 u_int w_number; 178 uint64_t w_sid; 179 boolean_t w_active; 180 LIST_ENTRY(g_eli_worker) w_next; 181 }; 182 183 #endif /* _KERNEL */ 184 185 struct g_eli_softc { 186 struct g_geom *sc_geom; 187 u_int sc_version; 188 u_int sc_crypto; 189 uint8_t sc_mkey[G_ELI_DATAIVKEYLEN]; 190 uint8_t sc_ekey[G_ELI_DATAKEYLEN]; 191 TAILQ_HEAD(, g_eli_key) sc_ekeys_queue; 192 RB_HEAD(g_eli_key_tree, g_eli_key) sc_ekeys_tree; 193 struct mtx sc_ekeys_lock; 194 uint64_t sc_ekeys_total; 195 uint64_t sc_ekeys_allocated; 196 u_int sc_ealgo; 197 u_int sc_ekeylen; 198 uint8_t sc_akey[G_ELI_AUTHKEYLEN]; 199 u_int sc_aalgo; 200 u_int sc_akeylen; 201 u_int sc_alen; 202 SHA256_CTX sc_akeyctx; 203 uint8_t sc_ivkey[G_ELI_IVKEYLEN]; 204 SHA256_CTX sc_ivctx; 205 int sc_nkey; 206 uint32_t sc_flags; 207 int sc_inflight; 208 off_t sc_mediasize; 209 size_t sc_sectorsize; 210 u_int sc_bytes_per_sector; 211 u_int sc_data_per_sector; 212 #ifndef _KERNEL 213 int sc_cpubind; 214 #else /* _KERNEL */ 215 boolean_t sc_cpubind; 216 217 /* Only for software cryptography. */ 218 struct bio_queue_head sc_queue; 219 struct mtx sc_queue_mtx; 220 LIST_HEAD(, g_eli_worker) sc_workers; 221 #endif /* _KERNEL */ 222 }; 223 #define sc_name sc_geom->name 224 225 #define G_ELI_KEY_MAGIC 0xe11341c 226 227 struct g_eli_key { 228 /* Key value, must be first in the structure. */ 229 uint8_t gek_key[G_ELI_DATAKEYLEN]; 230 /* Magic. */ 231 int gek_magic; 232 /* Key number. */ 233 uint64_t gek_keyno; 234 /* Reference counter. */ 235 int gek_count; 236 /* Keeps keys sorted by most recent use. */ 237 TAILQ_ENTRY(g_eli_key) gek_next; 238 /* Keeps keys sorted by number. */ 239 RB_ENTRY(g_eli_key) gek_link; 240 }; 241 242 struct g_eli_metadata { 243 char md_magic[16]; /* Magic value. */ 244 uint32_t md_version; /* Version number. */ 245 uint32_t md_flags; /* Additional flags. */ 246 uint16_t md_ealgo; /* Encryption algorithm. */ 247 uint16_t md_keylen; /* Key length. */ 248 uint16_t md_aalgo; /* Authentication algorithm. */ 249 uint64_t md_provsize; /* Provider's size. */ 250 uint32_t md_sectorsize; /* Sector size. */ 251 uint8_t md_keys; /* Available keys. */ 252 int32_t md_iterations; /* Number of iterations for PKCS#5v2. */ 253 uint8_t md_salt[G_ELI_SALTLEN]; /* Salt. */ 254 /* Encrypted master key (IV-key, Data-key, HMAC). */ 255 uint8_t md_mkeys[G_ELI_MAXMKEYS * G_ELI_MKEYLEN]; 256 u_char md_hash[16]; /* MD5 hash. */ 257 } __packed; 258 #ifndef _OpenSSL_ 259 static __inline void 260 eli_metadata_encode_v0(struct g_eli_metadata *md, u_char **datap) 261 { 262 u_char *p; 263 264 p = *datap; 265 le32enc(p, md->md_flags); p += sizeof(md->md_flags); 266 le16enc(p, md->md_ealgo); p += sizeof(md->md_ealgo); 267 le16enc(p, md->md_keylen); p += sizeof(md->md_keylen); 268 le64enc(p, md->md_provsize); p += sizeof(md->md_provsize); 269 le32enc(p, md->md_sectorsize); p += sizeof(md->md_sectorsize); 270 *p = md->md_keys; p += sizeof(md->md_keys); 271 le32enc(p, md->md_iterations); p += sizeof(md->md_iterations); 272 bcopy(md->md_salt, p, sizeof(md->md_salt)); p += sizeof(md->md_salt); 273 bcopy(md->md_mkeys, p, sizeof(md->md_mkeys)); p += sizeof(md->md_mkeys); 274 *datap = p; 275 } 276 static __inline void 277 eli_metadata_encode_v1v2v3v4v5v6v7(struct g_eli_metadata *md, u_char **datap) 278 { 279 u_char *p; 280 281 p = *datap; 282 le32enc(p, md->md_flags); p += sizeof(md->md_flags); 283 le16enc(p, md->md_ealgo); p += sizeof(md->md_ealgo); 284 le16enc(p, md->md_keylen); p += sizeof(md->md_keylen); 285 le16enc(p, md->md_aalgo); p += sizeof(md->md_aalgo); 286 le64enc(p, md->md_provsize); p += sizeof(md->md_provsize); 287 le32enc(p, md->md_sectorsize); p += sizeof(md->md_sectorsize); 288 *p = md->md_keys; p += sizeof(md->md_keys); 289 le32enc(p, md->md_iterations); p += sizeof(md->md_iterations); 290 bcopy(md->md_salt, p, sizeof(md->md_salt)); p += sizeof(md->md_salt); 291 bcopy(md->md_mkeys, p, sizeof(md->md_mkeys)); p += sizeof(md->md_mkeys); 292 *datap = p; 293 } 294 static __inline void 295 eli_metadata_encode(struct g_eli_metadata *md, u_char *data) 296 { 297 uint32_t hash[4]; 298 MD5_CTX ctx; 299 u_char *p; 300 301 p = data; 302 bcopy(md->md_magic, p, sizeof(md->md_magic)); 303 p += sizeof(md->md_magic); 304 le32enc(p, md->md_version); 305 p += sizeof(md->md_version); 306 switch (md->md_version) { 307 case G_ELI_VERSION_00: 308 eli_metadata_encode_v0(md, &p); 309 break; 310 case G_ELI_VERSION_01: 311 case G_ELI_VERSION_02: 312 case G_ELI_VERSION_03: 313 case G_ELI_VERSION_04: 314 case G_ELI_VERSION_05: 315 case G_ELI_VERSION_06: 316 case G_ELI_VERSION_07: 317 eli_metadata_encode_v1v2v3v4v5v6v7(md, &p); 318 break; 319 default: 320 #ifdef _KERNEL 321 panic("%s: Unsupported version %u.", __func__, 322 (u_int)md->md_version); 323 #else 324 assert(!"Unsupported metadata version."); 325 #endif 326 } 327 MD5Init(&ctx); 328 MD5Update(&ctx, data, p - data); 329 MD5Final((void *)hash, &ctx); 330 bcopy(hash, md->md_hash, sizeof(md->md_hash)); 331 bcopy(md->md_hash, p, sizeof(md->md_hash)); 332 } 333 static __inline int 334 eli_metadata_decode_v0(const u_char *data, struct g_eli_metadata *md) 335 { 336 uint32_t hash[4]; 337 MD5_CTX ctx; 338 const u_char *p; 339 340 p = data + sizeof(md->md_magic) + sizeof(md->md_version); 341 md->md_flags = le32dec(p); p += sizeof(md->md_flags); 342 md->md_ealgo = le16dec(p); p += sizeof(md->md_ealgo); 343 md->md_keylen = le16dec(p); p += sizeof(md->md_keylen); 344 md->md_provsize = le64dec(p); p += sizeof(md->md_provsize); 345 md->md_sectorsize = le32dec(p); p += sizeof(md->md_sectorsize); 346 md->md_keys = *p; p += sizeof(md->md_keys); 347 md->md_iterations = le32dec(p); p += sizeof(md->md_iterations); 348 bcopy(p, md->md_salt, sizeof(md->md_salt)); p += sizeof(md->md_salt); 349 bcopy(p, md->md_mkeys, sizeof(md->md_mkeys)); p += sizeof(md->md_mkeys); 350 MD5Init(&ctx); 351 MD5Update(&ctx, data, p - data); 352 MD5Final((void *)hash, &ctx); 353 bcopy(hash, md->md_hash, sizeof(md->md_hash)); 354 if (bcmp(md->md_hash, p, 16) != 0) 355 return (EINVAL); 356 return (0); 357 } 358 359 static __inline int 360 eli_metadata_decode_v1v2v3v4v5v6v7(const u_char *data, struct g_eli_metadata *md) 361 { 362 uint32_t hash[4]; 363 MD5_CTX ctx; 364 const u_char *p; 365 366 p = data + sizeof(md->md_magic) + sizeof(md->md_version); 367 md->md_flags = le32dec(p); p += sizeof(md->md_flags); 368 md->md_ealgo = le16dec(p); p += sizeof(md->md_ealgo); 369 md->md_keylen = le16dec(p); p += sizeof(md->md_keylen); 370 md->md_aalgo = le16dec(p); p += sizeof(md->md_aalgo); 371 md->md_provsize = le64dec(p); p += sizeof(md->md_provsize); 372 md->md_sectorsize = le32dec(p); p += sizeof(md->md_sectorsize); 373 md->md_keys = *p; p += sizeof(md->md_keys); 374 md->md_iterations = le32dec(p); p += sizeof(md->md_iterations); 375 bcopy(p, md->md_salt, sizeof(md->md_salt)); p += sizeof(md->md_salt); 376 bcopy(p, md->md_mkeys, sizeof(md->md_mkeys)); p += sizeof(md->md_mkeys); 377 MD5Init(&ctx); 378 MD5Update(&ctx, data, p - data); 379 MD5Final((void *)hash, &ctx); 380 bcopy(hash, md->md_hash, sizeof(md->md_hash)); 381 if (bcmp(md->md_hash, p, 16) != 0) 382 return (EINVAL); 383 return (0); 384 } 385 static __inline int 386 eli_metadata_decode(const u_char *data, struct g_eli_metadata *md) 387 { 388 int error; 389 390 bcopy(data, md->md_magic, sizeof(md->md_magic)); 391 if (strcmp(md->md_magic, G_ELI_MAGIC) != 0) 392 return (EINVAL); 393 md->md_version = le32dec(data + sizeof(md->md_magic)); 394 switch (md->md_version) { 395 case G_ELI_VERSION_00: 396 error = eli_metadata_decode_v0(data, md); 397 break; 398 case G_ELI_VERSION_01: 399 case G_ELI_VERSION_02: 400 case G_ELI_VERSION_03: 401 case G_ELI_VERSION_04: 402 case G_ELI_VERSION_05: 403 case G_ELI_VERSION_06: 404 case G_ELI_VERSION_07: 405 error = eli_metadata_decode_v1v2v3v4v5v6v7(data, md); 406 break; 407 default: 408 error = EOPNOTSUPP; 409 break; 410 } 411 return (error); 412 } 413 #endif /* !_OpenSSL */ 414 415 static __inline u_int 416 g_eli_str2ealgo(const char *name) 417 { 418 419 if (strcasecmp("null", name) == 0) 420 return (CRYPTO_NULL_CBC); 421 else if (strcasecmp("null-cbc", name) == 0) 422 return (CRYPTO_NULL_CBC); 423 else if (strcasecmp("aes", name) == 0) 424 return (CRYPTO_AES_XTS); 425 else if (strcasecmp("aes-cbc", name) == 0) 426 return (CRYPTO_AES_CBC); 427 else if (strcasecmp("aes-xts", name) == 0) 428 return (CRYPTO_AES_XTS); 429 else if (strcasecmp("blowfish", name) == 0) 430 return (CRYPTO_BLF_CBC); 431 else if (strcasecmp("blowfish-cbc", name) == 0) 432 return (CRYPTO_BLF_CBC); 433 else if (strcasecmp("camellia", name) == 0) 434 return (CRYPTO_CAMELLIA_CBC); 435 else if (strcasecmp("camellia-cbc", name) == 0) 436 return (CRYPTO_CAMELLIA_CBC); 437 else if (strcasecmp("3des", name) == 0) 438 return (CRYPTO_3DES_CBC); 439 else if (strcasecmp("3des-cbc", name) == 0) 440 return (CRYPTO_3DES_CBC); 441 return (CRYPTO_ALGORITHM_MIN - 1); 442 } 443 444 static __inline u_int 445 g_eli_str2aalgo(const char *name) 446 { 447 448 if (strcasecmp("hmac/md5", name) == 0) 449 return (CRYPTO_MD5_HMAC); 450 else if (strcasecmp("hmac/sha1", name) == 0) 451 return (CRYPTO_SHA1_HMAC); 452 else if (strcasecmp("hmac/ripemd160", name) == 0) 453 return (CRYPTO_RIPEMD160_HMAC); 454 else if (strcasecmp("hmac/sha256", name) == 0) 455 return (CRYPTO_SHA2_256_HMAC); 456 else if (strcasecmp("hmac/sha384", name) == 0) 457 return (CRYPTO_SHA2_384_HMAC); 458 else if (strcasecmp("hmac/sha512", name) == 0) 459 return (CRYPTO_SHA2_512_HMAC); 460 return (CRYPTO_ALGORITHM_MIN - 1); 461 } 462 463 static __inline const char * 464 g_eli_algo2str(u_int algo) 465 { 466 467 switch (algo) { 468 case CRYPTO_NULL_CBC: 469 return ("NULL"); 470 case CRYPTO_AES_CBC: 471 return ("AES-CBC"); 472 case CRYPTO_AES_XTS: 473 return ("AES-XTS"); 474 case CRYPTO_BLF_CBC: 475 return ("Blowfish-CBC"); 476 case CRYPTO_CAMELLIA_CBC: 477 return ("CAMELLIA-CBC"); 478 case CRYPTO_3DES_CBC: 479 return ("3DES-CBC"); 480 case CRYPTO_MD5_HMAC: 481 return ("HMAC/MD5"); 482 case CRYPTO_SHA1_HMAC: 483 return ("HMAC/SHA1"); 484 case CRYPTO_RIPEMD160_HMAC: 485 return ("HMAC/RIPEMD160"); 486 case CRYPTO_SHA2_256_HMAC: 487 return ("HMAC/SHA256"); 488 case CRYPTO_SHA2_384_HMAC: 489 return ("HMAC/SHA384"); 490 case CRYPTO_SHA2_512_HMAC: 491 return ("HMAC/SHA512"); 492 } 493 return ("unknown"); 494 } 495 496 static __inline void 497 eli_metadata_dump(const struct g_eli_metadata *md) 498 { 499 static const char hex[] = "0123456789abcdef"; 500 char str[sizeof(md->md_mkeys) * 2 + 1]; 501 u_int i; 502 503 printf(" magic: %s\n", md->md_magic); 504 printf(" version: %u\n", (u_int)md->md_version); 505 printf(" flags: 0x%x\n", (u_int)md->md_flags); 506 printf(" ealgo: %s\n", g_eli_algo2str(md->md_ealgo)); 507 printf(" keylen: %u\n", (u_int)md->md_keylen); 508 if (md->md_flags & G_ELI_FLAG_AUTH) 509 printf(" aalgo: %s\n", g_eli_algo2str(md->md_aalgo)); 510 printf(" provsize: %ju\n", (uintmax_t)md->md_provsize); 511 printf("sectorsize: %u\n", (u_int)md->md_sectorsize); 512 printf(" keys: 0x%02x\n", (u_int)md->md_keys); 513 printf("iterations: %d\n", (int)md->md_iterations); 514 bzero(str, sizeof(str)); 515 for (i = 0; i < sizeof(md->md_salt); i++) { 516 str[i * 2] = hex[md->md_salt[i] >> 4]; 517 str[i * 2 + 1] = hex[md->md_salt[i] & 0x0f]; 518 } 519 printf(" Salt: %s\n", str); 520 bzero(str, sizeof(str)); 521 for (i = 0; i < sizeof(md->md_mkeys); i++) { 522 str[i * 2] = hex[md->md_mkeys[i] >> 4]; 523 str[i * 2 + 1] = hex[md->md_mkeys[i] & 0x0f]; 524 } 525 printf("Master Key: %s\n", str); 526 bzero(str, sizeof(str)); 527 for (i = 0; i < 16; i++) { 528 str[i * 2] = hex[md->md_hash[i] >> 4]; 529 str[i * 2 + 1] = hex[md->md_hash[i] & 0x0f]; 530 } 531 printf(" MD5 hash: %s\n", str); 532 } 533 534 static __inline u_int 535 g_eli_keylen(u_int algo, u_int keylen) 536 { 537 538 switch (algo) { 539 case CRYPTO_NULL_CBC: 540 if (keylen == 0) 541 keylen = 64 * 8; 542 else { 543 if (keylen > 64 * 8) 544 keylen = 0; 545 } 546 return (keylen); 547 case CRYPTO_AES_CBC: 548 case CRYPTO_CAMELLIA_CBC: 549 switch (keylen) { 550 case 0: 551 return (128); 552 case 128: 553 case 192: 554 case 256: 555 return (keylen); 556 default: 557 return (0); 558 } 559 case CRYPTO_AES_XTS: 560 switch (keylen) { 561 case 0: 562 return (128); 563 case 128: 564 case 256: 565 return (keylen); 566 default: 567 return (0); 568 } 569 case CRYPTO_BLF_CBC: 570 if (keylen == 0) 571 return (128); 572 if (keylen < 128 || keylen > 448) 573 return (0); 574 if ((keylen % 32) != 0) 575 return (0); 576 return (keylen); 577 case CRYPTO_3DES_CBC: 578 if (keylen == 0 || keylen == 192) 579 return (192); 580 return (0); 581 default: 582 return (0); 583 } 584 } 585 586 static __inline u_int 587 g_eli_hashlen(u_int algo) 588 { 589 590 switch (algo) { 591 case CRYPTO_MD5_HMAC: 592 return (16); 593 case CRYPTO_SHA1_HMAC: 594 return (20); 595 case CRYPTO_RIPEMD160_HMAC: 596 return (20); 597 case CRYPTO_SHA2_256_HMAC: 598 return (32); 599 case CRYPTO_SHA2_384_HMAC: 600 return (48); 601 case CRYPTO_SHA2_512_HMAC: 602 return (64); 603 } 604 return (0); 605 } 606 607 static __inline void 608 eli_metadata_softc(struct g_eli_softc *sc, const struct g_eli_metadata *md, 609 u_int sectorsize, off_t mediasize) 610 { 611 612 sc->sc_version = md->md_version; 613 sc->sc_inflight = 0; 614 sc->sc_crypto = G_ELI_CRYPTO_UNKNOWN; 615 sc->sc_flags = md->md_flags; 616 /* Backward compatibility. */ 617 if (md->md_version < G_ELI_VERSION_04) 618 sc->sc_flags |= G_ELI_FLAG_NATIVE_BYTE_ORDER; 619 if (md->md_version < G_ELI_VERSION_05) 620 sc->sc_flags |= G_ELI_FLAG_SINGLE_KEY; 621 if (md->md_version < G_ELI_VERSION_06 && 622 (sc->sc_flags & G_ELI_FLAG_AUTH) != 0) { 623 sc->sc_flags |= G_ELI_FLAG_FIRST_KEY; 624 } 625 if (md->md_version < G_ELI_VERSION_07) 626 sc->sc_flags |= G_ELI_FLAG_ENC_IVKEY; 627 sc->sc_ealgo = md->md_ealgo; 628 629 if (sc->sc_flags & G_ELI_FLAG_AUTH) { 630 sc->sc_akeylen = sizeof(sc->sc_akey) * 8; 631 sc->sc_aalgo = md->md_aalgo; 632 sc->sc_alen = g_eli_hashlen(sc->sc_aalgo); 633 634 sc->sc_data_per_sector = sectorsize - sc->sc_alen; 635 /* 636 * Some hash functions (like SHA1 and RIPEMD160) generates hash 637 * which length is not multiple of 128 bits, but we want data 638 * length to be multiple of 128, so we can encrypt without 639 * padding. The line below rounds down data length to multiple 640 * of 128 bits. 641 */ 642 sc->sc_data_per_sector -= sc->sc_data_per_sector % 16; 643 644 sc->sc_bytes_per_sector = 645 (md->md_sectorsize - 1) / sc->sc_data_per_sector + 1; 646 sc->sc_bytes_per_sector *= sectorsize; 647 } 648 sc->sc_sectorsize = md->md_sectorsize; 649 sc->sc_mediasize = mediasize; 650 if (!(sc->sc_flags & G_ELI_FLAG_ONETIME)) 651 sc->sc_mediasize -= sectorsize; 652 if (!(sc->sc_flags & G_ELI_FLAG_AUTH)) 653 sc->sc_mediasize -= (sc->sc_mediasize % sc->sc_sectorsize); 654 else { 655 sc->sc_mediasize /= sc->sc_bytes_per_sector; 656 sc->sc_mediasize *= sc->sc_sectorsize; 657 } 658 sc->sc_ekeylen = md->md_keylen; 659 } 660 661 #ifdef _KERNEL 662 int g_eli_read_metadata(struct g_class *mp, struct g_provider *pp, 663 struct g_eli_metadata *md); 664 struct g_geom *g_eli_create(struct gctl_req *req, struct g_class *mp, 665 struct g_provider *bpp, const struct g_eli_metadata *md, 666 const u_char *mkey, int nkey); 667 int g_eli_destroy(struct g_eli_softc *sc, boolean_t force); 668 669 int g_eli_access(struct g_provider *pp, int dr, int dw, int de); 670 void g_eli_config(struct gctl_req *req, struct g_class *mp, const char *verb); 671 672 void g_eli_read_done(struct bio *bp); 673 void g_eli_write_done(struct bio *bp); 674 int g_eli_crypto_rerun(struct cryptop *crp); 675 676 void g_eli_crypto_read(struct g_eli_softc *sc, struct bio *bp, boolean_t fromworker); 677 void g_eli_crypto_run(struct g_eli_worker *wr, struct bio *bp); 678 679 void g_eli_auth_read(struct g_eli_softc *sc, struct bio *bp); 680 void g_eli_auth_run(struct g_eli_worker *wr, struct bio *bp); 681 #endif 682 void g_eli_crypto_ivgen(struct g_eli_softc *sc, off_t offset, u_char *iv, 683 size_t size); 684 685 void g_eli_mkey_hmac(unsigned char *mkey, const unsigned char *key); 686 int g_eli_mkey_decrypt(const struct g_eli_metadata *md, 687 const unsigned char *key, unsigned char *mkey, unsigned *nkeyp); 688 int g_eli_mkey_encrypt(unsigned algo, const unsigned char *key, unsigned keylen, 689 unsigned char *mkey); 690 #ifdef _KERNEL 691 void g_eli_mkey_propagate(struct g_eli_softc *sc, const unsigned char *mkey); 692 #endif 693 694 int g_eli_crypto_encrypt(u_int algo, u_char *data, size_t datasize, 695 const u_char *key, size_t keysize); 696 int g_eli_crypto_decrypt(u_int algo, u_char *data, size_t datasize, 697 const u_char *key, size_t keysize); 698 699 struct hmac_ctx { 700 SHA512_CTX innerctx; 701 SHA512_CTX outerctx; 702 }; 703 704 void g_eli_crypto_hmac_init(struct hmac_ctx *ctx, const uint8_t *hkey, 705 size_t hkeylen); 706 void g_eli_crypto_hmac_update(struct hmac_ctx *ctx, const uint8_t *data, 707 size_t datasize); 708 void g_eli_crypto_hmac_final(struct hmac_ctx *ctx, uint8_t *md, size_t mdsize); 709 void g_eli_crypto_hmac(const uint8_t *hkey, size_t hkeysize, 710 const uint8_t *data, size_t datasize, uint8_t *md, size_t mdsize); 711 712 void g_eli_key_fill(struct g_eli_softc *sc, struct g_eli_key *key, 713 uint64_t keyno); 714 #ifdef _KERNEL 715 void g_eli_key_init(struct g_eli_softc *sc); 716 void g_eli_key_destroy(struct g_eli_softc *sc); 717 uint8_t *g_eli_key_hold(struct g_eli_softc *sc, off_t offset, size_t blocksize); 718 void g_eli_key_drop(struct g_eli_softc *sc, uint8_t *rawkey); 719 #endif 720 #endif /* !_G_ELI_H_ */ 721