1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2005-2019 Pawel Jakub Dawidek <pawel@dawidek.net> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 * $FreeBSD$ 29 */ 30 31 #ifndef _G_ELI_H_ 32 #define _G_ELI_H_ 33 34 #include <sys/endian.h> 35 #include <sys/errno.h> 36 #include <sys/malloc.h> 37 #include <crypto/sha2/sha256.h> 38 #include <crypto/sha2/sha512.h> 39 #include <opencrypto/cryptodev.h> 40 #ifdef _KERNEL 41 #include <sys/bio.h> 42 #include <sys/libkern.h> 43 #include <sys/lock.h> 44 #include <sys/mutex.h> 45 #include <geom/geom.h> 46 #include <crypto/intake.h> 47 #else 48 #include <assert.h> 49 #include <stdio.h> 50 #include <string.h> 51 #include <strings.h> 52 #endif 53 #include <sys/queue.h> 54 #include <sys/tree.h> 55 #ifndef _OpenSSL_ 56 #include <sys/md5.h> 57 #endif 58 59 #define G_ELI_CLASS_NAME "ELI" 60 #define G_ELI_MAGIC "GEOM::ELI" 61 #define G_ELI_SUFFIX ".eli" 62 63 /* 64 * Version history: 65 * 0 - Initial version number. 66 * 1 - Added data authentication support (md_aalgo field and 67 * G_ELI_FLAG_AUTH flag). 68 * 2 - Added G_ELI_FLAG_READONLY. 69 * 3 - Added 'configure' subcommand. 70 * 4 - IV is generated from offset converted to little-endian 71 * (the G_ELI_FLAG_NATIVE_BYTE_ORDER flag will be set for older versions). 72 * 5 - Added multiple encrypton keys and AES-XTS support. 73 * 6 - Fixed usage of multiple keys for authenticated providers (the 74 * G_ELI_FLAG_FIRST_KEY flag will be set for older versions). 75 * 7 - Encryption keys are now generated from the Data Key and not from the 76 * IV Key (the G_ELI_FLAG_ENC_IVKEY flag will be set for older versions). 77 */ 78 #define G_ELI_VERSION_00 0 79 #define G_ELI_VERSION_01 1 80 #define G_ELI_VERSION_02 2 81 #define G_ELI_VERSION_03 3 82 #define G_ELI_VERSION_04 4 83 #define G_ELI_VERSION_05 5 84 #define G_ELI_VERSION_06 6 85 #define G_ELI_VERSION_07 7 86 #define G_ELI_VERSION G_ELI_VERSION_07 87 88 /* ON DISK FLAGS. */ 89 /* Use random, onetime keys. */ 90 #define G_ELI_FLAG_ONETIME 0x00000001 91 /* Ask for the passphrase from the kernel, before mounting root. */ 92 #define G_ELI_FLAG_BOOT 0x00000002 93 /* Detach on last close, if we were open for writing. */ 94 #define G_ELI_FLAG_WO_DETACH 0x00000004 95 /* Detach on last close. */ 96 #define G_ELI_FLAG_RW_DETACH 0x00000008 97 /* Provide data authentication. */ 98 #define G_ELI_FLAG_AUTH 0x00000010 99 /* Provider is read-only, we should deny all write attempts. */ 100 #define G_ELI_FLAG_RO 0x00000020 101 /* Don't pass through BIO_DELETE requests. */ 102 #define G_ELI_FLAG_NODELETE 0x00000040 103 /* This GELI supports GELIBoot */ 104 #define G_ELI_FLAG_GELIBOOT 0x00000080 105 /* Hide passphrase length in GELIboot. */ 106 #define G_ELI_FLAG_GELIDISPLAYPASS 0x00000100 107 /* Expand provider automatically. */ 108 #define G_ELI_FLAG_AUTORESIZE 0x00000200 109 110 /* RUNTIME FLAGS. */ 111 /* Provider was open for writing. */ 112 #define G_ELI_FLAG_WOPEN 0x00010000 113 /* Destroy device. */ 114 #define G_ELI_FLAG_DESTROY 0x00020000 115 /* Provider uses native byte-order for IV generation. */ 116 #define G_ELI_FLAG_NATIVE_BYTE_ORDER 0x00040000 117 /* Provider uses single encryption key. */ 118 #define G_ELI_FLAG_SINGLE_KEY 0x00080000 119 /* Device suspended. */ 120 #define G_ELI_FLAG_SUSPEND 0x00100000 121 /* Provider uses first encryption key. */ 122 #define G_ELI_FLAG_FIRST_KEY 0x00200000 123 /* Provider uses IV-Key for encryption key generation. */ 124 #define G_ELI_FLAG_ENC_IVKEY 0x00400000 125 126 /* BIO pflag values. */ 127 #define G_ELI_WORKER(pflags) ((pflags) & 0xff) 128 #define G_ELI_MAX_WORKERS 255 129 #define G_ELI_NEW_BIO G_ELI_MAX_WORKERS 130 #define G_ELI_SETWORKER(pflags, w) \ 131 (pflags) = ((pflags) & 0xff00) | ((w) & 0xff) 132 #define G_ELI_SET_NEW_BIO(pflags) G_ELI_SETWORKER((pflags), G_ELI_NEW_BIO) 133 #define G_ELI_IS_NEW_BIO(pflags) (G_ELI_WORKER(pflags) == G_ELI_NEW_BIO) 134 #define G_ELI_UMA_ALLOC 0x100 /* bio_driver2 alloc came from UMA */ 135 136 #define SHA512_MDLEN 64 137 #define G_ELI_AUTH_SECKEYLEN SHA256_DIGEST_LENGTH 138 139 #define G_ELI_MAXMKEYS 2 140 #define G_ELI_MAXKEYLEN 64 141 #define G_ELI_USERKEYLEN G_ELI_MAXKEYLEN 142 #define G_ELI_DATAKEYLEN G_ELI_MAXKEYLEN 143 #define G_ELI_AUTHKEYLEN G_ELI_MAXKEYLEN 144 #define G_ELI_IVKEYLEN G_ELI_MAXKEYLEN 145 #define G_ELI_SALTLEN 64 146 #define G_ELI_DATAIVKEYLEN (G_ELI_DATAKEYLEN + G_ELI_IVKEYLEN) 147 /* Data-Key, IV-Key, HMAC_SHA512(Derived-Key, Data-Key+IV-Key) */ 148 #define G_ELI_MKEYLEN (G_ELI_DATAIVKEYLEN + SHA512_MDLEN) 149 #define G_ELI_OVERWRITES 5 150 /* Switch data encryption key every 2^20 blocks. */ 151 #define G_ELI_KEY_SHIFT 20 152 153 #define G_ELI_CRYPTO_UNKNOWN 0 154 #define G_ELI_CRYPTO_HW 1 155 #define G_ELI_CRYPTO_SW 2 156 #define G_ELI_CRYPTO_SW_ACCEL 3 157 158 #ifdef _KERNEL 159 #if (MAX_KEY_BYTES < G_ELI_DATAIVKEYLEN) 160 #error "MAX_KEY_BYTES is less than G_ELI_DATAKEYLEN" 161 #endif 162 163 extern int g_eli_debug; 164 extern u_int g_eli_overwrites; 165 extern u_int g_eli_batch; 166 167 #define G_ELI_DEBUG(lvl, ...) \ 168 _GEOM_DEBUG("GEOM_ELI", g_eli_debug, (lvl), NULL, __VA_ARGS__) 169 #define G_ELI_LOGREQ(lvl, bp, ...) \ 170 _GEOM_DEBUG("GEOM_ELI", g_eli_debug, (lvl), (bp), __VA_ARGS__) 171 172 struct g_eli_worker { 173 struct g_eli_softc *w_softc; 174 struct proc *w_proc; 175 void *w_first_key; 176 u_int w_number; 177 crypto_session_t w_sid; 178 boolean_t w_active; 179 LIST_ENTRY(g_eli_worker) w_next; 180 }; 181 182 #endif /* _KERNEL */ 183 184 struct g_eli_softc { 185 struct g_geom *sc_geom; 186 u_int sc_version; 187 u_int sc_crypto; 188 uint8_t sc_mkey[G_ELI_DATAIVKEYLEN]; 189 uint8_t sc_ekey[G_ELI_DATAKEYLEN]; 190 TAILQ_HEAD(, g_eli_key) sc_ekeys_queue; 191 RB_HEAD(g_eli_key_tree, g_eli_key) sc_ekeys_tree; 192 #ifndef _STANDALONE 193 struct mtx sc_ekeys_lock; 194 #endif 195 uint64_t sc_ekeys_total; 196 uint64_t sc_ekeys_allocated; 197 u_int sc_ealgo; 198 u_int sc_ekeylen; 199 uint8_t sc_akey[G_ELI_AUTHKEYLEN]; 200 u_int sc_aalgo; 201 u_int sc_akeylen; 202 u_int sc_alen; 203 SHA256_CTX sc_akeyctx; 204 uint8_t sc_ivkey[G_ELI_IVKEYLEN]; 205 SHA256_CTX sc_ivctx; 206 int sc_nkey; 207 uint32_t sc_flags; 208 int sc_inflight; 209 off_t sc_mediasize; 210 size_t sc_sectorsize; 211 off_t sc_provsize; 212 u_int sc_bytes_per_sector; 213 u_int sc_data_per_sector; 214 #ifndef _KERNEL 215 int sc_cpubind; 216 #else /* _KERNEL */ 217 boolean_t sc_cpubind; 218 219 /* Only for software cryptography. */ 220 struct bio_queue_head sc_queue; 221 struct mtx sc_queue_mtx; 222 LIST_HEAD(, g_eli_worker) sc_workers; 223 #endif /* _KERNEL */ 224 }; 225 #define sc_name sc_geom->name 226 227 #define G_ELI_KEY_MAGIC 0xe11341c 228 229 struct g_eli_key { 230 /* Key value, must be first in the structure. */ 231 uint8_t gek_key[G_ELI_DATAKEYLEN]; 232 /* Magic. */ 233 int gek_magic; 234 /* Key number. */ 235 uint64_t gek_keyno; 236 /* Reference counter. */ 237 int gek_count; 238 /* Keeps keys sorted by most recent use. */ 239 TAILQ_ENTRY(g_eli_key) gek_next; 240 /* Keeps keys sorted by number. */ 241 RB_ENTRY(g_eli_key) gek_link; 242 }; 243 244 struct g_eli_metadata { 245 char md_magic[16]; /* Magic value. */ 246 uint32_t md_version; /* Version number. */ 247 uint32_t md_flags; /* Additional flags. */ 248 uint16_t md_ealgo; /* Encryption algorithm. */ 249 uint16_t md_keylen; /* Key length. */ 250 uint16_t md_aalgo; /* Authentication algorithm. */ 251 uint64_t md_provsize; /* Provider's size. */ 252 uint32_t md_sectorsize; /* Sector size. */ 253 uint8_t md_keys; /* Available keys. */ 254 int32_t md_iterations; /* Number of iterations for PKCS#5v2. */ 255 uint8_t md_salt[G_ELI_SALTLEN]; /* Salt. */ 256 /* Encrypted master key (IV-key, Data-key, HMAC). */ 257 uint8_t md_mkeys[G_ELI_MAXMKEYS * G_ELI_MKEYLEN]; 258 u_char md_hash[16]; /* MD5 hash. */ 259 } __packed; 260 #ifndef _OpenSSL_ 261 static __inline void 262 eli_metadata_encode_v0(struct g_eli_metadata *md, u_char **datap) 263 { 264 u_char *p; 265 266 p = *datap; 267 le32enc(p, md->md_flags); p += sizeof(md->md_flags); 268 le16enc(p, md->md_ealgo); p += sizeof(md->md_ealgo); 269 le16enc(p, md->md_keylen); p += sizeof(md->md_keylen); 270 le64enc(p, md->md_provsize); p += sizeof(md->md_provsize); 271 le32enc(p, md->md_sectorsize); p += sizeof(md->md_sectorsize); 272 *p = md->md_keys; p += sizeof(md->md_keys); 273 le32enc(p, md->md_iterations); p += sizeof(md->md_iterations); 274 bcopy(md->md_salt, p, sizeof(md->md_salt)); p += sizeof(md->md_salt); 275 bcopy(md->md_mkeys, p, sizeof(md->md_mkeys)); p += sizeof(md->md_mkeys); 276 *datap = p; 277 } 278 static __inline void 279 eli_metadata_encode_v1v2v3v4v5v6v7(struct g_eli_metadata *md, u_char **datap) 280 { 281 u_char *p; 282 283 p = *datap; 284 le32enc(p, md->md_flags); p += sizeof(md->md_flags); 285 le16enc(p, md->md_ealgo); p += sizeof(md->md_ealgo); 286 le16enc(p, md->md_keylen); p += sizeof(md->md_keylen); 287 le16enc(p, md->md_aalgo); p += sizeof(md->md_aalgo); 288 le64enc(p, md->md_provsize); p += sizeof(md->md_provsize); 289 le32enc(p, md->md_sectorsize); p += sizeof(md->md_sectorsize); 290 *p = md->md_keys; p += sizeof(md->md_keys); 291 le32enc(p, md->md_iterations); p += sizeof(md->md_iterations); 292 bcopy(md->md_salt, p, sizeof(md->md_salt)); p += sizeof(md->md_salt); 293 bcopy(md->md_mkeys, p, sizeof(md->md_mkeys)); p += sizeof(md->md_mkeys); 294 *datap = p; 295 } 296 static __inline void 297 eli_metadata_encode(struct g_eli_metadata *md, u_char *data) 298 { 299 uint32_t hash[4]; 300 MD5_CTX ctx; 301 u_char *p; 302 303 p = data; 304 bcopy(md->md_magic, p, sizeof(md->md_magic)); 305 p += sizeof(md->md_magic); 306 le32enc(p, md->md_version); 307 p += sizeof(md->md_version); 308 switch (md->md_version) { 309 case G_ELI_VERSION_00: 310 eli_metadata_encode_v0(md, &p); 311 break; 312 case G_ELI_VERSION_01: 313 case G_ELI_VERSION_02: 314 case G_ELI_VERSION_03: 315 case G_ELI_VERSION_04: 316 case G_ELI_VERSION_05: 317 case G_ELI_VERSION_06: 318 case G_ELI_VERSION_07: 319 eli_metadata_encode_v1v2v3v4v5v6v7(md, &p); 320 break; 321 default: 322 #ifdef _KERNEL 323 panic("%s: Unsupported version %u.", __func__, 324 (u_int)md->md_version); 325 #else 326 assert(!"Unsupported metadata version."); 327 #endif 328 } 329 MD5Init(&ctx); 330 MD5Update(&ctx, data, p - data); 331 MD5Final((void *)hash, &ctx); 332 bcopy(hash, md->md_hash, sizeof(md->md_hash)); 333 bcopy(md->md_hash, p, sizeof(md->md_hash)); 334 } 335 static __inline int 336 eli_metadata_decode_v0(const u_char *data, struct g_eli_metadata *md) 337 { 338 uint32_t hash[4]; 339 MD5_CTX ctx; 340 const u_char *p; 341 342 p = data + sizeof(md->md_magic) + sizeof(md->md_version); 343 md->md_flags = le32dec(p); p += sizeof(md->md_flags); 344 md->md_ealgo = le16dec(p); p += sizeof(md->md_ealgo); 345 md->md_keylen = le16dec(p); p += sizeof(md->md_keylen); 346 md->md_provsize = le64dec(p); p += sizeof(md->md_provsize); 347 md->md_sectorsize = le32dec(p); p += sizeof(md->md_sectorsize); 348 md->md_keys = *p; p += sizeof(md->md_keys); 349 md->md_iterations = le32dec(p); p += sizeof(md->md_iterations); 350 bcopy(p, md->md_salt, sizeof(md->md_salt)); p += sizeof(md->md_salt); 351 bcopy(p, md->md_mkeys, sizeof(md->md_mkeys)); p += sizeof(md->md_mkeys); 352 MD5Init(&ctx); 353 MD5Update(&ctx, data, p - data); 354 MD5Final((void *)hash, &ctx); 355 bcopy(hash, md->md_hash, sizeof(md->md_hash)); 356 if (bcmp(md->md_hash, p, 16) != 0) 357 return (EINVAL); 358 return (0); 359 } 360 361 static __inline int 362 eli_metadata_decode_v1v2v3v4v5v6v7(const u_char *data, struct g_eli_metadata *md) 363 { 364 uint32_t hash[4]; 365 MD5_CTX ctx; 366 const u_char *p; 367 368 p = data + sizeof(md->md_magic) + sizeof(md->md_version); 369 md->md_flags = le32dec(p); p += sizeof(md->md_flags); 370 md->md_ealgo = le16dec(p); p += sizeof(md->md_ealgo); 371 md->md_keylen = le16dec(p); p += sizeof(md->md_keylen); 372 md->md_aalgo = le16dec(p); p += sizeof(md->md_aalgo); 373 md->md_provsize = le64dec(p); p += sizeof(md->md_provsize); 374 md->md_sectorsize = le32dec(p); p += sizeof(md->md_sectorsize); 375 md->md_keys = *p; p += sizeof(md->md_keys); 376 md->md_iterations = le32dec(p); p += sizeof(md->md_iterations); 377 bcopy(p, md->md_salt, sizeof(md->md_salt)); p += sizeof(md->md_salt); 378 bcopy(p, md->md_mkeys, sizeof(md->md_mkeys)); p += sizeof(md->md_mkeys); 379 MD5Init(&ctx); 380 MD5Update(&ctx, data, p - data); 381 MD5Final((void *)hash, &ctx); 382 bcopy(hash, md->md_hash, sizeof(md->md_hash)); 383 if (bcmp(md->md_hash, p, 16) != 0) 384 return (EINVAL); 385 return (0); 386 } 387 static __inline int 388 eli_metadata_decode(const u_char *data, struct g_eli_metadata *md) 389 { 390 int error; 391 392 bcopy(data, md->md_magic, sizeof(md->md_magic)); 393 if (strcmp(md->md_magic, G_ELI_MAGIC) != 0) 394 return (EINVAL); 395 md->md_version = le32dec(data + sizeof(md->md_magic)); 396 switch (md->md_version) { 397 case G_ELI_VERSION_00: 398 error = eli_metadata_decode_v0(data, md); 399 break; 400 case G_ELI_VERSION_01: 401 case G_ELI_VERSION_02: 402 case G_ELI_VERSION_03: 403 case G_ELI_VERSION_04: 404 case G_ELI_VERSION_05: 405 case G_ELI_VERSION_06: 406 case G_ELI_VERSION_07: 407 error = eli_metadata_decode_v1v2v3v4v5v6v7(data, md); 408 break; 409 default: 410 error = EOPNOTSUPP; 411 break; 412 } 413 return (error); 414 } 415 #endif /* !_OpenSSL */ 416 417 static __inline u_int 418 g_eli_str2ealgo(const char *name) 419 { 420 421 if (strcasecmp("null", name) == 0) 422 return (CRYPTO_NULL_CBC); 423 else if (strcasecmp("null-cbc", name) == 0) 424 return (CRYPTO_NULL_CBC); 425 else if (strcasecmp("aes", name) == 0) 426 return (CRYPTO_AES_XTS); 427 else if (strcasecmp("aes-cbc", name) == 0) 428 return (CRYPTO_AES_CBC); 429 else if (strcasecmp("aes-xts", name) == 0) 430 return (CRYPTO_AES_XTS); 431 else if (strcasecmp("camellia", name) == 0) 432 return (CRYPTO_CAMELLIA_CBC); 433 else if (strcasecmp("camellia-cbc", name) == 0) 434 return (CRYPTO_CAMELLIA_CBC); 435 return (CRYPTO_ALGORITHM_MIN - 1); 436 } 437 438 static __inline u_int 439 g_eli_str2aalgo(const char *name) 440 { 441 442 if (strcasecmp("hmac/sha1", name) == 0) 443 return (CRYPTO_SHA1_HMAC); 444 else if (strcasecmp("hmac/ripemd160", name) == 0) 445 return (CRYPTO_RIPEMD160_HMAC); 446 else if (strcasecmp("hmac/sha256", name) == 0) 447 return (CRYPTO_SHA2_256_HMAC); 448 else if (strcasecmp("hmac/sha384", name) == 0) 449 return (CRYPTO_SHA2_384_HMAC); 450 else if (strcasecmp("hmac/sha512", name) == 0) 451 return (CRYPTO_SHA2_512_HMAC); 452 return (CRYPTO_ALGORITHM_MIN - 1); 453 } 454 455 static __inline const char * 456 g_eli_algo2str(u_int algo) 457 { 458 459 switch (algo) { 460 case CRYPTO_NULL_CBC: 461 return ("NULL"); 462 case CRYPTO_AES_CBC: 463 return ("AES-CBC"); 464 case CRYPTO_AES_XTS: 465 return ("AES-XTS"); 466 case CRYPTO_CAMELLIA_CBC: 467 return ("CAMELLIA-CBC"); 468 case CRYPTO_SHA1_HMAC: 469 return ("HMAC/SHA1"); 470 case CRYPTO_RIPEMD160_HMAC: 471 return ("HMAC/RIPEMD160"); 472 case CRYPTO_SHA2_256_HMAC: 473 return ("HMAC/SHA256"); 474 case CRYPTO_SHA2_384_HMAC: 475 return ("HMAC/SHA384"); 476 case CRYPTO_SHA2_512_HMAC: 477 return ("HMAC/SHA512"); 478 } 479 return ("unknown"); 480 } 481 482 static __inline void 483 eli_metadata_dump(const struct g_eli_metadata *md) 484 { 485 static const char hex[] = "0123456789abcdef"; 486 char str[sizeof(md->md_mkeys) * 2 + 1]; 487 u_int i; 488 489 printf(" magic: %s\n", md->md_magic); 490 printf(" version: %u\n", (u_int)md->md_version); 491 printf(" flags: 0x%x\n", (u_int)md->md_flags); 492 printf(" ealgo: %s\n", g_eli_algo2str(md->md_ealgo)); 493 printf(" keylen: %u\n", (u_int)md->md_keylen); 494 if (md->md_flags & G_ELI_FLAG_AUTH) 495 printf(" aalgo: %s\n", g_eli_algo2str(md->md_aalgo)); 496 printf(" provsize: %ju\n", (uintmax_t)md->md_provsize); 497 printf("sectorsize: %u\n", (u_int)md->md_sectorsize); 498 printf(" keys: 0x%02x\n", (u_int)md->md_keys); 499 printf("iterations: %d\n", (int)md->md_iterations); 500 bzero(str, sizeof(str)); 501 for (i = 0; i < sizeof(md->md_salt); i++) { 502 str[i * 2] = hex[md->md_salt[i] >> 4]; 503 str[i * 2 + 1] = hex[md->md_salt[i] & 0x0f]; 504 } 505 printf(" Salt: %s\n", str); 506 bzero(str, sizeof(str)); 507 for (i = 0; i < sizeof(md->md_mkeys); i++) { 508 str[i * 2] = hex[md->md_mkeys[i] >> 4]; 509 str[i * 2 + 1] = hex[md->md_mkeys[i] & 0x0f]; 510 } 511 printf("Master Key: %s\n", str); 512 bzero(str, sizeof(str)); 513 for (i = 0; i < 16; i++) { 514 str[i * 2] = hex[md->md_hash[i] >> 4]; 515 str[i * 2 + 1] = hex[md->md_hash[i] & 0x0f]; 516 } 517 printf(" MD5 hash: %s\n", str); 518 } 519 520 #ifdef _KERNEL 521 static __inline bool 522 eli_metadata_crypto_supported(const struct g_eli_metadata *md) 523 { 524 525 switch (md->md_ealgo) { 526 case CRYPTO_NULL_CBC: 527 case CRYPTO_AES_CBC: 528 case CRYPTO_CAMELLIA_CBC: 529 case CRYPTO_AES_XTS: 530 break; 531 default: 532 return (false); 533 } 534 if (md->md_flags & G_ELI_FLAG_AUTH) { 535 switch (md->md_aalgo) { 536 case CRYPTO_SHA1_HMAC: 537 case CRYPTO_RIPEMD160_HMAC: 538 case CRYPTO_SHA2_256_HMAC: 539 case CRYPTO_SHA2_384_HMAC: 540 case CRYPTO_SHA2_512_HMAC: 541 break; 542 default: 543 return (false); 544 } 545 } 546 return (true); 547 } 548 #endif 549 550 static __inline u_int 551 g_eli_keylen(u_int algo, u_int keylen) 552 { 553 554 switch (algo) { 555 case CRYPTO_NULL_CBC: 556 if (keylen == 0) 557 keylen = 64 * 8; 558 else { 559 if (keylen > 64 * 8) 560 keylen = 0; 561 } 562 return (keylen); 563 case CRYPTO_AES_CBC: 564 case CRYPTO_CAMELLIA_CBC: 565 switch (keylen) { 566 case 0: 567 return (128); 568 case 128: 569 case 192: 570 case 256: 571 return (keylen); 572 default: 573 return (0); 574 } 575 case CRYPTO_AES_XTS: 576 switch (keylen) { 577 case 0: 578 return (128); 579 case 128: 580 case 256: 581 return (keylen); 582 default: 583 return (0); 584 } 585 default: 586 return (0); 587 } 588 } 589 590 static __inline u_int 591 g_eli_ivlen(u_int algo) 592 { 593 594 switch (algo) { 595 case CRYPTO_AES_XTS: 596 return (AES_XTS_IV_LEN); 597 case CRYPTO_AES_CBC: 598 return (AES_BLOCK_LEN); 599 case CRYPTO_CAMELLIA_CBC: 600 return (CAMELLIA_BLOCK_LEN); 601 } 602 return (0); 603 } 604 605 static __inline u_int 606 g_eli_hashlen(u_int algo) 607 { 608 609 switch (algo) { 610 case CRYPTO_SHA1_HMAC: 611 return (20); 612 case CRYPTO_RIPEMD160_HMAC: 613 return (20); 614 case CRYPTO_SHA2_256_HMAC: 615 return (32); 616 case CRYPTO_SHA2_384_HMAC: 617 return (48); 618 case CRYPTO_SHA2_512_HMAC: 619 return (64); 620 } 621 return (0); 622 } 623 624 static __inline off_t 625 eli_mediasize(const struct g_eli_softc *sc, off_t mediasize, u_int sectorsize) 626 { 627 628 if ((sc->sc_flags & G_ELI_FLAG_ONETIME) == 0) { 629 mediasize -= sectorsize; 630 } 631 if ((sc->sc_flags & G_ELI_FLAG_AUTH) == 0) { 632 mediasize -= (mediasize % sc->sc_sectorsize); 633 } else { 634 mediasize /= sc->sc_bytes_per_sector; 635 mediasize *= sc->sc_sectorsize; 636 } 637 638 return (mediasize); 639 } 640 641 static __inline void 642 eli_metadata_softc(struct g_eli_softc *sc, const struct g_eli_metadata *md, 643 u_int sectorsize, off_t mediasize) 644 { 645 646 sc->sc_version = md->md_version; 647 sc->sc_inflight = 0; 648 sc->sc_crypto = G_ELI_CRYPTO_UNKNOWN; 649 sc->sc_flags = md->md_flags; 650 /* Backward compatibility. */ 651 if (md->md_version < G_ELI_VERSION_04) 652 sc->sc_flags |= G_ELI_FLAG_NATIVE_BYTE_ORDER; 653 if (md->md_version < G_ELI_VERSION_05) 654 sc->sc_flags |= G_ELI_FLAG_SINGLE_KEY; 655 if (md->md_version < G_ELI_VERSION_06 && 656 (sc->sc_flags & G_ELI_FLAG_AUTH) != 0) { 657 sc->sc_flags |= G_ELI_FLAG_FIRST_KEY; 658 } 659 if (md->md_version < G_ELI_VERSION_07) 660 sc->sc_flags |= G_ELI_FLAG_ENC_IVKEY; 661 sc->sc_ealgo = md->md_ealgo; 662 663 if (sc->sc_flags & G_ELI_FLAG_AUTH) { 664 sc->sc_akeylen = sizeof(sc->sc_akey) * 8; 665 sc->sc_aalgo = md->md_aalgo; 666 sc->sc_alen = g_eli_hashlen(sc->sc_aalgo); 667 668 sc->sc_data_per_sector = sectorsize - sc->sc_alen; 669 /* 670 * Some hash functions (like SHA1 and RIPEMD160) generates hash 671 * which length is not multiple of 128 bits, but we want data 672 * length to be multiple of 128, so we can encrypt without 673 * padding. The line below rounds down data length to multiple 674 * of 128 bits. 675 */ 676 sc->sc_data_per_sector -= sc->sc_data_per_sector % 16; 677 678 sc->sc_bytes_per_sector = 679 (md->md_sectorsize - 1) / sc->sc_data_per_sector + 1; 680 sc->sc_bytes_per_sector *= sectorsize; 681 } 682 sc->sc_provsize = mediasize; 683 sc->sc_sectorsize = md->md_sectorsize; 684 sc->sc_mediasize = eli_mediasize(sc, mediasize, sectorsize); 685 sc->sc_ekeylen = md->md_keylen; 686 } 687 688 #ifdef _KERNEL 689 int g_eli_read_metadata(struct g_class *mp, struct g_provider *pp, 690 struct g_eli_metadata *md); 691 struct g_geom *g_eli_create(struct gctl_req *req, struct g_class *mp, 692 struct g_provider *bpp, const struct g_eli_metadata *md, 693 const u_char *mkey, int nkey); 694 int g_eli_destroy(struct g_eli_softc *sc, boolean_t force); 695 696 int g_eli_access(struct g_provider *pp, int dr, int dw, int de); 697 void g_eli_config(struct gctl_req *req, struct g_class *mp, const char *verb); 698 699 void g_eli_read_done(struct bio *bp); 700 void g_eli_write_done(struct bio *bp); 701 int g_eli_crypto_rerun(struct cryptop *crp); 702 703 bool g_eli_alloc_data(struct bio *bp, int sz); 704 void g_eli_free_data(struct bio *bp); 705 706 void g_eli_crypto_read(struct g_eli_softc *sc, struct bio *bp, boolean_t fromworker); 707 void g_eli_crypto_run(struct g_eli_worker *wr, struct bio *bp); 708 709 void g_eli_auth_read(struct g_eli_softc *sc, struct bio *bp); 710 void g_eli_auth_run(struct g_eli_worker *wr, struct bio *bp); 711 #endif 712 void g_eli_crypto_ivgen(struct g_eli_softc *sc, off_t offset, u_char *iv, 713 size_t size); 714 715 void g_eli_mkey_hmac(unsigned char *mkey, const unsigned char *key); 716 int g_eli_mkey_decrypt(const struct g_eli_metadata *md, 717 const unsigned char *key, unsigned char *mkey, unsigned keyp); 718 int g_eli_mkey_decrypt_any(const struct g_eli_metadata *md, 719 const unsigned char *key, unsigned char *mkey, unsigned *nkeyp); 720 int g_eli_mkey_encrypt(unsigned algo, const unsigned char *key, unsigned keylen, 721 unsigned char *mkey); 722 #ifdef _KERNEL 723 void g_eli_mkey_propagate(struct g_eli_softc *sc, const unsigned char *mkey); 724 #endif 725 726 int g_eli_crypto_encrypt(u_int algo, u_char *data, size_t datasize, 727 const u_char *key, size_t keysize); 728 int g_eli_crypto_decrypt(u_int algo, u_char *data, size_t datasize, 729 const u_char *key, size_t keysize); 730 731 struct hmac_ctx { 732 SHA512_CTX innerctx; 733 SHA512_CTX outerctx; 734 }; 735 736 void g_eli_crypto_hmac_init(struct hmac_ctx *ctx, const char *hkey, 737 size_t hkeylen); 738 void g_eli_crypto_hmac_update(struct hmac_ctx *ctx, const uint8_t *data, 739 size_t datasize); 740 void g_eli_crypto_hmac_final(struct hmac_ctx *ctx, uint8_t *md, size_t mdsize); 741 void g_eli_crypto_hmac(const char *hkey, size_t hkeysize, 742 const uint8_t *data, size_t datasize, uint8_t *md, size_t mdsize); 743 744 void g_eli_key_fill(struct g_eli_softc *sc, struct g_eli_key *key, 745 uint64_t keyno); 746 #ifdef _KERNEL 747 void g_eli_key_init(struct g_eli_softc *sc); 748 void g_eli_key_destroy(struct g_eli_softc *sc); 749 void g_eli_key_resize(struct g_eli_softc *sc); 750 uint8_t *g_eli_key_hold(struct g_eli_softc *sc, off_t offset, size_t blocksize); 751 void g_eli_key_drop(struct g_eli_softc *sc, uint8_t *rawkey); 752 #endif 753 #endif /* !_G_ELI_H_ */ 754