geom_eli.c revision 161127
1/*- 2 * Copyright (c) 2004-2006 Pawel Jakub Dawidek <pjd@FreeBSD.org> 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 27#include <sys/cdefs.h> 28__FBSDID("$FreeBSD: head/sbin/geom/class/eli/geom_eli.c 161127 2006-08-09 18:11:14Z pjd $"); 29 30#include <stdio.h> 31#include <stdint.h> 32#include <stdlib.h> 33#include <unistd.h> 34#include <fcntl.h> 35#include <readpassphrase.h> 36#include <string.h> 37#include <strings.h> 38#include <libgeom.h> 39#include <paths.h> 40#include <errno.h> 41#include <assert.h> 42 43#include <sys/param.h> 44#include <sys/mman.h> 45#include <sys/resource.h> 46#include <opencrypto/cryptodev.h> 47#include <geom/eli/g_eli.h> 48#include <geom/eli/pkcs5v2.h> 49 50#include "core/geom.h" 51#include "misc/subr.h" 52 53 54uint32_t lib_version = G_LIB_VERSION; 55uint32_t version = G_ELI_VERSION; 56 57static char aalgo[] = "none"; 58static char ealgo[] = "aes"; 59static intmax_t keylen = 0; 60static intmax_t keyno = -1; 61static intmax_t iterations = -1; 62static intmax_t sectorsize = 0; 63static char keyfile[] = "", newkeyfile[] = ""; 64 65static void eli_main(struct gctl_req *req, unsigned flags); 66static void eli_init(struct gctl_req *req); 67static void eli_attach(struct gctl_req *req); 68static void eli_setkey(struct gctl_req *req); 69static void eli_delkey(struct gctl_req *req); 70static void eli_kill(struct gctl_req *req); 71static void eli_backup(struct gctl_req *req); 72static void eli_restore(struct gctl_req *req); 73static void eli_clear(struct gctl_req *req); 74static void eli_dump(struct gctl_req *req); 75 76/* 77 * Available commands: 78 * 79 * init [-bhPv] [-a aalgo] [-e ealgo] [-i iterations] [-l keylen] [-K newkeyfile] prov 80 * label - alias for 'init' 81 * attach [-dprv] [-k keyfile] prov 82 * detach [-fl] prov ... 83 * stop - alias for 'detach' 84 * onetime [-d] [-a aalgo] [-e ealgo] [-l keylen] prov ... 85 * setkey [-pPv] [-n keyno] [-k keyfile] [-K newkeyfile] prov 86 * delkey [-afv] [-n keyno] prov 87 * kill [-av] [prov ...] 88 * backup [-v] prov file 89 * restore [-v] file prov 90 * clear [-v] prov ... 91 * dump [-v] prov ... 92 */ 93struct g_command class_commands[] = { 94 { "init", G_FLAG_VERBOSE, eli_main, 95 { 96 { 'a', "aalgo", aalgo, G_TYPE_STRING }, 97 { 'b', "boot", NULL, G_TYPE_NONE }, 98 { 'e', "ealgo", ealgo, G_TYPE_STRING }, 99 { 'i', "iterations", &iterations, G_TYPE_NUMBER }, 100 { 'K', "newkeyfile", newkeyfile, G_TYPE_STRING }, 101 { 'l', "keylen", &keylen, G_TYPE_NUMBER }, 102 { 'P', "nonewpassphrase", NULL, G_TYPE_NONE }, 103 { 's', "sectorsize", §orsize, G_TYPE_NUMBER }, 104 G_OPT_SENTINEL 105 }, 106 "[-bPv] [-a aalgo] [-e ealgo] [-i iterations] [-l keylen] [-K newkeyfile] [-s sectorsize] prov" 107 }, 108 { "label", G_FLAG_VERBOSE, eli_main, 109 { 110 { 'a', "aalgo", aalgo, G_TYPE_STRING }, 111 { 'b', "boot", NULL, G_TYPE_NONE }, 112 { 'e', "ealgo", ealgo, G_TYPE_STRING }, 113 { 'i', "iterations", &iterations, G_TYPE_NUMBER }, 114 { 'K', "newkeyfile", newkeyfile, G_TYPE_STRING }, 115 { 'l', "keylen", &keylen, G_TYPE_NUMBER }, 116 { 'P', "nonewpassphrase", NULL, G_TYPE_NONE }, 117 { 's', "sectorsize", §orsize, G_TYPE_NUMBER }, 118 G_OPT_SENTINEL 119 }, 120 "- an alias for 'init'" 121 }, 122 { "attach", G_FLAG_VERBOSE | G_FLAG_LOADKLD, eli_main, 123 { 124 { 'd', "detach", NULL, G_TYPE_NONE }, 125 { 'k', "keyfile", keyfile, G_TYPE_STRING }, 126 { 'p', "nopassphrase", NULL, G_TYPE_NONE }, 127 { 'r', "readonly", NULL, G_TYPE_NONE }, 128 G_OPT_SENTINEL 129 }, 130 "[-dprv] [-k keyfile] prov" 131 }, 132 { "detach", 0, NULL, 133 { 134 { 'f', "force", NULL, G_TYPE_NONE }, 135 { 'l', "last", NULL, G_TYPE_NONE }, 136 G_OPT_SENTINEL 137 }, 138 "[-fl] prov ..." 139 }, 140 { "stop", 0, NULL, 141 { 142 { 'f', "force", NULL, G_TYPE_NONE }, 143 { 'l', "last", NULL, G_TYPE_NONE }, 144 G_OPT_SENTINEL 145 }, 146 "- an alias for 'detach'" 147 }, 148 { "onetime", G_FLAG_VERBOSE | G_FLAG_LOADKLD, NULL, 149 { 150 { 'a', "aalgo", aalgo, G_TYPE_STRING }, 151 { 'd', "detach", NULL, G_TYPE_NONE }, 152 { 'e', "ealgo", ealgo, G_TYPE_STRING }, 153 { 'l', "keylen", &keylen, G_TYPE_NUMBER }, 154 { 's', "sectorsize", §orsize, G_TYPE_NUMBER }, 155 G_OPT_SENTINEL 156 }, 157 "[-d] [-a aalgo] [-e ealgo] [-l keylen] [-s sectorsize] prov ..." 158 }, 159 { "setkey", G_FLAG_VERBOSE, eli_main, 160 { 161 { 'i', "iterations", &iterations, G_TYPE_NUMBER }, 162 { 'k', "keyfile", keyfile, G_TYPE_STRING }, 163 { 'K', "newkeyfile", newkeyfile, G_TYPE_STRING }, 164 { 'n', "keyno", &keyno, G_TYPE_NUMBER }, 165 { 'p', "nopassphrase", NULL, G_TYPE_NONE }, 166 { 'P', "nonewpassphrase", NULL, G_TYPE_NONE }, 167 G_OPT_SENTINEL 168 }, 169 "[-pPv] [-n keyno] [-i iterations] [-k keyfile] [-K newkeyfile] prov" 170 }, 171 { "delkey", G_FLAG_VERBOSE, eli_main, 172 { 173 { 'a', "all", NULL, G_TYPE_NONE }, 174 { 'f', "force", NULL, G_TYPE_NONE }, 175 { 'n', "keyno", &keyno, G_TYPE_NUMBER }, 176 G_OPT_SENTINEL 177 }, 178 "[-afv] [-n keyno] prov" 179 }, 180 { "kill", G_FLAG_VERBOSE, eli_main, 181 { 182 { 'a', "all", NULL, G_TYPE_NONE }, 183 G_OPT_SENTINEL 184 }, 185 "[-av] [prov ...]" 186 }, 187 { "backup", G_FLAG_VERBOSE, eli_main, G_NULL_OPTS, 188 "[-v] prov file" 189 }, 190 { "restore", G_FLAG_VERBOSE, eli_main, G_NULL_OPTS, 191 "[-v] file prov" 192 }, 193 { "clear", G_FLAG_VERBOSE, eli_main, G_NULL_OPTS, 194 "[-v] prov ..." 195 }, 196 { "dump", G_FLAG_VERBOSE, eli_main, G_NULL_OPTS, 197 "[-v] prov ..." 198 }, 199 G_CMD_SENTINEL 200}; 201 202static int verbose = 0; 203 204static int 205eli_protect(struct gctl_req *req) 206{ 207 struct rlimit rl; 208 209 /* Disable core dumps. */ 210 rl.rlim_cur = 0; 211 rl.rlim_max = 0; 212 if (setrlimit(RLIMIT_CORE, &rl) == -1) { 213 gctl_error(req, "Cannot disable core dumps: %s.", 214 strerror(errno)); 215 return (-1); 216 } 217 /* Disable swapping. */ 218 if (mlockall(MCL_FUTURE) == -1) { 219 gctl_error(req, "Cannot lock memory: %s.", strerror(errno)); 220 return (-1); 221 } 222 return (0); 223} 224 225static void 226eli_main(struct gctl_req *req, unsigned flags) 227{ 228 const char *name; 229 230 if (eli_protect(req) == -1) 231 return; 232 233 if ((flags & G_FLAG_VERBOSE) != 0) 234 verbose = 1; 235 236 name = gctl_get_ascii(req, "verb"); 237 if (name == NULL) { 238 gctl_error(req, "No '%s' argument.", "verb"); 239 return; 240 } 241 if (strcmp(name, "init") == 0 || strcmp(name, "label") == 0) 242 eli_init(req); 243 else if (strcmp(name, "attach") == 0) 244 eli_attach(req); 245 else if (strcmp(name, "setkey") == 0) 246 eli_setkey(req); 247 else if (strcmp(name, "delkey") == 0) 248 eli_delkey(req); 249 else if (strcmp(name, "kill") == 0) 250 eli_kill(req); 251 else if (strcmp(name, "backup") == 0) 252 eli_backup(req); 253 else if (strcmp(name, "restore") == 0) 254 eli_restore(req); 255 else if (strcmp(name, "dump") == 0) 256 eli_dump(req); 257 else if (strcmp(name, "clear") == 0) 258 eli_clear(req); 259 else 260 gctl_error(req, "Unknown command: %s.", name); 261} 262 263static void 264arc4rand(unsigned char *buf, size_t size) 265{ 266 uint32_t *buf4; 267 size_t size4; 268 unsigned i; 269 270 buf4 = (uint32_t *)buf; 271 size4 = size / 4; 272 273 for (i = 0; i < size4; i++) 274 buf4[i] = arc4random(); 275 for (i *= 4; i < size; i++) 276 buf[i] = arc4random() % 0xff; 277} 278 279static int 280eli_is_attached(const char *prov) 281{ 282 char name[MAXPATHLEN]; 283 unsigned secsize; 284 285 /* 286 * Not the best way to do it, but the easiest. 287 * We try to open provider and check if it is a GEOM provider 288 * by asking about its sectorsize. 289 */ 290 snprintf(name, sizeof(name), "%s%s", prov, G_ELI_SUFFIX); 291 secsize = g_get_sectorsize(name); 292 if (secsize > 0) 293 return (1); 294 return (0); 295} 296 297static unsigned char * 298eli_genkey(struct gctl_req *req, struct g_eli_metadata *md, unsigned char *key, 299 int new) 300{ 301 struct hmac_ctx ctx; 302 const char *str; 303 int error, nopassphrase; 304 305 nopassphrase = 306 gctl_get_int(req, new ? "nonewpassphrase" : "nopassphrase"); 307 308 g_eli_crypto_hmac_init(&ctx, NULL, 0); 309 310 str = gctl_get_ascii(req, new ? "newkeyfile" : "keyfile"); 311 if (str[0] == '\0' && nopassphrase) { 312 gctl_error(req, "No key components given."); 313 return (NULL); 314 } else if (str[0] != '\0') { 315 char buf[MAXPHYS]; 316 ssize_t done; 317 int fd; 318 319 if (strcmp(str, "-") == 0) 320 fd = STDIN_FILENO; 321 else { 322 fd = open(str, O_RDONLY); 323 if (fd == -1) { 324 gctl_error(req, "Cannot open keyfile %s: %s.", 325 str, strerror(errno)); 326 return (NULL); 327 } 328 } 329 while ((done = read(fd, buf, sizeof(buf))) > 0) 330 g_eli_crypto_hmac_update(&ctx, buf, done); 331 error = errno; 332 if (strcmp(str, "-") != 0) 333 close(fd); 334 bzero(buf, sizeof(buf)); 335 if (done == -1) { 336 gctl_error(req, "Cannot read keyfile %s: %s.", str, 337 strerror(error)); 338 return (NULL); 339 } 340 } 341 342 if (!nopassphrase) { 343 char buf1[BUFSIZ], buf2[BUFSIZ], *p; 344 345 if (!new && md->md_iterations == -1) { 346 gctl_error(req, "Missing -p flag."); 347 return (NULL); 348 } 349 for (;;) { 350 p = readpassphrase( 351 new ? "Enter new passphrase:" : "Enter passphrase:", 352 buf1, sizeof(buf1), RPP_ECHO_OFF | RPP_REQUIRE_TTY); 353 if (p == NULL) { 354 bzero(buf1, sizeof(buf1)); 355 gctl_error(req, "Cannot read passphrase: %s.", 356 strerror(errno)); 357 return (NULL); 358 } 359 360 if (new) { 361 p = readpassphrase("Reenter new passphrase: ", 362 buf2, sizeof(buf2), 363 RPP_ECHO_OFF | RPP_REQUIRE_TTY); 364 if (p == NULL) { 365 bzero(buf1, sizeof(buf1)); 366 gctl_error(req, 367 "Cannot read passphrase: %s.", 368 strerror(errno)); 369 return (NULL); 370 } 371 372 if (strcmp(buf1, buf2) != 0) { 373 bzero(buf2, sizeof(buf2)); 374 fprintf(stderr, "They didn't match.\n"); 375 continue; 376 } 377 bzero(buf2, sizeof(buf2)); 378 } 379 break; 380 } 381 /* 382 * Field md_iterations equal to -1 means "choose some sane 383 * value for me". 384 */ 385 if (md->md_iterations == -1) { 386 assert(new); 387 if (verbose) 388 printf("Calculating number of iterations...\n"); 389 md->md_iterations = pkcs5v2_calculate(2000000); 390 assert(md->md_iterations > 0); 391 if (verbose) { 392 printf("Done, using %d iterations.\n", 393 md->md_iterations); 394 } 395 } 396 /* 397 * If md_iterations is equal to 0, user don't want PKCS#5v2. 398 */ 399 if (md->md_iterations == 0) { 400 g_eli_crypto_hmac_update(&ctx, md->md_salt, 401 sizeof(md->md_salt)); 402 g_eli_crypto_hmac_update(&ctx, buf1, strlen(buf1)); 403 } else /* if (md->md_iterations > 0) */ { 404 unsigned char dkey[G_ELI_USERKEYLEN]; 405 406 pkcs5v2_genkey(dkey, sizeof(dkey), md->md_salt, 407 sizeof(md->md_salt), buf1, md->md_iterations); 408 g_eli_crypto_hmac_update(&ctx, dkey, sizeof(dkey)); 409 bzero(dkey, sizeof(dkey)); 410 } 411 bzero(buf1, sizeof(buf1)); 412 } 413 g_eli_crypto_hmac_final(&ctx, key, 0); 414 return (key); 415} 416 417static int 418eli_metadata_read(struct gctl_req *req, const char *prov, 419 struct g_eli_metadata *md) 420{ 421 unsigned char sector[sizeof(struct g_eli_metadata)]; 422 int error; 423 424 if (g_get_sectorsize(prov) == 0) { 425 int fd; 426 427 /* This is a file probably. */ 428 fd = open(prov, O_RDONLY); 429 if (fd == -1) { 430 gctl_error(req, "Cannot open %s: %s.", prov, 431 strerror(errno)); 432 return (-1); 433 } 434 if (read(fd, sector, sizeof(sector)) != sizeof(sector)) { 435 gctl_error(req, "Cannot read metadata from %s: %s.", 436 prov, strerror(errno)); 437 close(fd); 438 return (-1); 439 } 440 close(fd); 441 } else { 442 /* This is a GEOM provider. */ 443 error = g_metadata_read(prov, sector, sizeof(sector), 444 G_ELI_MAGIC); 445 if (error != 0) { 446 gctl_error(req, "Cannot read metadata from %s: %s.", 447 prov, strerror(error)); 448 return (-1); 449 } 450 } 451 if (eli_metadata_decode(sector, md) != 0) { 452 gctl_error(req, "MD5 hash mismatch for %s.", prov); 453 return (-1); 454 } 455 return (0); 456} 457 458static int 459eli_metadata_store(struct gctl_req *req, const char *prov, 460 struct g_eli_metadata *md) 461{ 462 unsigned char sector[sizeof(struct g_eli_metadata)]; 463 int error; 464 465 eli_metadata_encode(md, sector); 466 if (g_get_sectorsize(prov) == 0) { 467 int fd; 468 469 /* This is a file probably. */ 470 fd = open(prov, O_WRONLY | O_TRUNC); 471 if (fd == -1) { 472 gctl_error(req, "Cannot open %s: %s.", prov, 473 strerror(errno)); 474 bzero(sector, sizeof(sector)); 475 return (-1); 476 } 477 if (write(fd, sector, sizeof(sector)) != sizeof(sector)) { 478 gctl_error(req, "Cannot write metadata to %s: %s.", 479 prov, strerror(errno)); 480 bzero(sector, sizeof(sector)); 481 close(fd); 482 return (-1); 483 } 484 close(fd); 485 } else { 486 /* This is a GEOM provider. */ 487 error = g_metadata_store(prov, sector, sizeof(sector)); 488 if (error != 0) { 489 gctl_error(req, "Cannot write metadata to %s: %s.", 490 prov, strerror(errno)); 491 bzero(sector, sizeof(sector)); 492 return (-1); 493 } 494 } 495 bzero(sector, sizeof(sector)); 496 return (0); 497} 498 499static void 500eli_init(struct gctl_req *req) 501{ 502 struct g_eli_metadata md; 503 unsigned char sector[sizeof(struct g_eli_metadata)]; 504 unsigned char key[G_ELI_USERKEYLEN]; 505 const char *str, *prov; 506 unsigned secsize; 507 off_t mediasize; 508 intmax_t val; 509 int error, nargs; 510 511 nargs = gctl_get_int(req, "nargs"); 512 if (nargs != 1) { 513 gctl_error(req, "Invalid number of arguments."); 514 return; 515 } 516 prov = gctl_get_ascii(req, "arg0"); 517 mediasize = g_get_mediasize(prov); 518 secsize = g_get_sectorsize(prov); 519 if (mediasize == 0 || secsize == 0) { 520 gctl_error(req, "Cannot get informations about %s: %s.", prov, 521 strerror(errno)); 522 return; 523 } 524 525 bzero(&md, sizeof(md)); 526 strlcpy(md.md_magic, G_ELI_MAGIC, sizeof(md.md_magic)); 527 md.md_version = G_ELI_VERSION; 528 md.md_flags = 0; 529 if (gctl_get_int(req, "boot")) 530 md.md_flags |= G_ELI_FLAG_BOOT; 531 md.md_ealgo = CRYPTO_ALGORITHM_MIN - 1; 532 str = gctl_get_ascii(req, "aalgo"); 533 if (strcmp(str, "none") != 0) { 534 md.md_aalgo = g_eli_str2aalgo(str); 535 if (md.md_aalgo >= CRYPTO_ALGORITHM_MIN && 536 md.md_aalgo <= CRYPTO_ALGORITHM_MAX) { 537 md.md_flags |= G_ELI_FLAG_AUTH; 538 } else { 539 /* 540 * For backward compatibility, check if the -a option 541 * was used to provide encryption algorithm. 542 */ 543 md.md_ealgo = g_eli_str2ealgo(str); 544 if (md.md_ealgo < CRYPTO_ALGORITHM_MIN || 545 md.md_ealgo > CRYPTO_ALGORITHM_MAX) { 546 gctl_error(req, 547 "Invalid authentication algorithm."); 548 return; 549 } else { 550 fprintf(stderr, "warning: The -e option, not " 551 "the -a option is now used to specify " 552 "encryption algorithm to use.\n"); 553 } 554 } 555 } 556 if (md.md_ealgo < CRYPTO_ALGORITHM_MIN || 557 md.md_ealgo > CRYPTO_ALGORITHM_MAX) { 558 str = gctl_get_ascii(req, "ealgo"); 559 md.md_ealgo = g_eli_str2ealgo(str); 560 if (md.md_ealgo < CRYPTO_ALGORITHM_MIN || 561 md.md_ealgo > CRYPTO_ALGORITHM_MAX) { 562 gctl_error(req, "Invalid encryption algorithm."); 563 return; 564 } 565 } 566 val = gctl_get_intmax(req, "keylen"); 567 md.md_keylen = val; 568 md.md_keylen = g_eli_keylen(md.md_ealgo, md.md_keylen); 569 if (md.md_keylen == 0) { 570 gctl_error(req, "Invalid key length."); 571 return; 572 } 573 md.md_provsize = mediasize; 574 575 val = gctl_get_intmax(req, "iterations"); 576 if (val != -1) { 577 int nonewpassphrase; 578 579 /* 580 * Don't allow to set iterations when there will be no 581 * passphrase. 582 */ 583 nonewpassphrase = gctl_get_int(req, "nonewpassphrase"); 584 if (nonewpassphrase) { 585 gctl_error(req, 586 "Options -i and -P are mutually exclusive."); 587 return; 588 } 589 } 590 md.md_iterations = val; 591 592 val = gctl_get_intmax(req, "sectorsize"); 593 if (val == 0) 594 md.md_sectorsize = secsize; 595 else { 596 if (val < 0 || (val % secsize) != 0) { 597 gctl_error(req, "Invalid sector size."); 598 return; 599 } 600 md.md_sectorsize = val; 601 } 602 603 md.md_keys = 0x01; 604 arc4rand(md.md_salt, sizeof(md.md_salt)); 605 arc4rand(md.md_mkeys, sizeof(md.md_mkeys)); 606 607 /* Generate user key. */ 608 if (eli_genkey(req, &md, key, 1) == NULL) { 609 bzero(key, sizeof(key)); 610 bzero(&md, sizeof(md)); 611 return; 612 } 613 614 /* Encrypt the first and the only Master Key. */ 615 error = g_eli_mkey_encrypt(md.md_ealgo, key, md.md_keylen, md.md_mkeys); 616 bzero(key, sizeof(key)); 617 if (error != 0) { 618 bzero(&md, sizeof(md)); 619 gctl_error(req, "Cannot encrypt Master Key: %s.", 620 strerror(error)); 621 return; 622 } 623 624 eli_metadata_encode(&md, sector); 625 bzero(&md, sizeof(md)); 626 error = g_metadata_store(prov, sector, sizeof(sector)); 627 bzero(sector, sizeof(sector)); 628 if (error != 0) { 629 gctl_error(req, "Cannot store metadata on %s: %s.", prov, 630 strerror(error)); 631 return; 632 } 633 if (verbose) 634 printf("Metadata value stored on %s.\n", prov); 635} 636 637static void 638eli_attach(struct gctl_req *req) 639{ 640 struct g_eli_metadata md; 641 unsigned char key[G_ELI_USERKEYLEN]; 642 const char *prov; 643 int nargs; 644 645 nargs = gctl_get_int(req, "nargs"); 646 if (nargs != 1) { 647 gctl_error(req, "Invalid number of arguments."); 648 return; 649 } 650 prov = gctl_get_ascii(req, "arg0"); 651 652 if (eli_metadata_read(req, prov, &md) == -1) 653 return; 654 655 if (eli_genkey(req, &md, key, 0) == NULL) { 656 bzero(key, sizeof(key)); 657 return; 658 } 659 660 gctl_ro_param(req, "key", sizeof(key), key); 661 if (gctl_issue(req) == NULL) { 662 if (verbose) 663 printf("Attched to %s.\n", prov); 664 } 665 bzero(key, sizeof(key)); 666} 667 668static void 669eli_setkey_attached(struct gctl_req *req, struct g_eli_metadata *md) 670{ 671 unsigned char key[G_ELI_USERKEYLEN]; 672 intmax_t val; 673 674 val = gctl_get_intmax(req, "iterations"); 675 /* Check if iterations number should be changed. */ 676 if (val != -1) 677 md->md_iterations = val; 678 679 /* Generate key for Master Key encryption. */ 680 if (eli_genkey(req, md, key, 1) == NULL) { 681 bzero(key, sizeof(key)); 682 return; 683 } 684 685 gctl_ro_param(req, "key", sizeof(key), key); 686 gctl_issue(req); 687 bzero(key, sizeof(key)); 688} 689 690static void 691eli_setkey_detached(struct gctl_req *req, const char *prov, 692 struct g_eli_metadata *md) 693{ 694 unsigned char key[G_ELI_USERKEYLEN], mkey[G_ELI_DATAIVKEYLEN]; 695 unsigned char *mkeydst; 696 intmax_t val; 697 unsigned nkey; 698 int error; 699 700 if (md->md_keys == 0) { 701 gctl_error(req, "No valid keys on %s.", prov); 702 return; 703 } 704 705 /* Generate key for Master Key decryption. */ 706 if (eli_genkey(req, md, key, 0) == NULL) { 707 bzero(key, sizeof(key)); 708 return; 709 } 710 711 /* Decrypt Master Key. */ 712 error = g_eli_mkey_decrypt(md, key, mkey, &nkey); 713 bzero(key, sizeof(key)); 714 if (error != 0) { 715 bzero(md, sizeof(*md)); 716 if (error == -1) 717 gctl_error(req, "Wrong key for %s.", prov); 718 else /* if (error > 0) */ { 719 gctl_error(req, "Cannot decrypt Master Key: %s.", 720 strerror(error)); 721 } 722 return; 723 } 724 if (verbose) 725 printf("Decrypted Master Key %u.\n", nkey); 726 727 val = gctl_get_intmax(req, "keyno"); 728 if (val != -1) 729 nkey = val; 730#if 0 731 else 732 ; /* Use the key number which was found during decryption. */ 733#endif 734 if (nkey >= G_ELI_MAXMKEYS) { 735 gctl_error(req, "Invalid '%s' argument.", "keyno"); 736 return; 737 } 738 739 val = gctl_get_intmax(req, "iterations"); 740 /* Check if iterations number should and can be changed. */ 741 if (val != -1) { 742 if (bitcount32(md->md_keys) != 1) { 743 gctl_error(req, "To be able to use '-i' option, only " 744 "one key can be defined."); 745 return; 746 } 747 if (md->md_keys != (1 << nkey)) { 748 gctl_error(req, "Only already defined key can be " 749 "changed when '-i' option is used."); 750 return; 751 } 752 md->md_iterations = val; 753 } 754 755 mkeydst = md->md_mkeys + nkey * G_ELI_MKEYLEN; 756 md->md_keys |= (1 << nkey); 757 758 bcopy(mkey, mkeydst, sizeof(mkey)); 759 bzero(mkey, sizeof(mkey)); 760 761 /* Generate key for Master Key encryption. */ 762 if (eli_genkey(req, md, key, 1) == NULL) { 763 bzero(key, sizeof(key)); 764 bzero(md, sizeof(*md)); 765 return; 766 } 767 768 /* Encrypt the Master-Key with the new key. */ 769 error = g_eli_mkey_encrypt(md->md_ealgo, key, md->md_keylen, mkeydst); 770 bzero(key, sizeof(key)); 771 if (error != 0) { 772 bzero(md, sizeof(*md)); 773 gctl_error(req, "Cannot encrypt Master Key: %s.", 774 strerror(error)); 775 return; 776 } 777 778 /* Store metadata with fresh key. */ 779 eli_metadata_store(req, prov, md); 780 bzero(md, sizeof(*md)); 781} 782 783static void 784eli_setkey(struct gctl_req *req) 785{ 786 struct g_eli_metadata md; 787 const char *prov; 788 int nargs; 789 790 nargs = gctl_get_int(req, "nargs"); 791 if (nargs != 1) { 792 gctl_error(req, "Invalid number of arguments."); 793 return; 794 } 795 prov = gctl_get_ascii(req, "arg0"); 796 797 if (eli_metadata_read(req, prov, &md) == -1) 798 return; 799 800 if (eli_is_attached(prov)) 801 eli_setkey_attached(req, &md); 802 else 803 eli_setkey_detached(req, prov, &md); 804} 805 806static void 807eli_delkey_attached(struct gctl_req *req, const char *prov __unused) 808{ 809 810 gctl_issue(req); 811} 812 813static void 814eli_delkey_detached(struct gctl_req *req, const char *prov) 815{ 816 struct g_eli_metadata md; 817 unsigned char *mkeydst; 818 intmax_t val; 819 unsigned nkey; 820 int all, force; 821 822 if (eli_metadata_read(req, prov, &md) == -1) 823 return; 824 825 all = gctl_get_int(req, "all"); 826 if (all) 827 arc4rand(md.md_mkeys, sizeof(md.md_mkeys)); 828 else { 829 force = gctl_get_int(req, "force"); 830 val = gctl_get_intmax(req, "keyno"); 831 if (val == -1) { 832 gctl_error(req, "Key number has to be specified."); 833 return; 834 } 835 nkey = val; 836 if (nkey >= G_ELI_MAXMKEYS) { 837 gctl_error(req, "Invalid '%s' argument.", "keyno"); 838 return; 839 } 840 if (!(md.md_keys & (1 << nkey)) && !force) { 841 gctl_error(req, "Master Key %u is not set.", nkey); 842 return; 843 } 844 md.md_keys &= ~(1 << nkey); 845 if (md.md_keys == 0 && !force) { 846 gctl_error(req, "This is the last Master Key. Use '-f' " 847 "option if you really want to remove it."); 848 return; 849 } 850 mkeydst = md.md_mkeys + nkey * G_ELI_MKEYLEN; 851 arc4rand(mkeydst, G_ELI_MKEYLEN); 852 } 853 854 eli_metadata_store(req, prov, &md); 855 bzero(&md, sizeof(md)); 856} 857 858static void 859eli_delkey(struct gctl_req *req) 860{ 861 const char *prov; 862 int nargs; 863 864 nargs = gctl_get_int(req, "nargs"); 865 if (nargs != 1) { 866 gctl_error(req, "Invalid number of arguments."); 867 return; 868 } 869 prov = gctl_get_ascii(req, "arg0"); 870 871 if (eli_is_attached(prov)) 872 eli_delkey_attached(req, prov); 873 else 874 eli_delkey_detached(req, prov); 875} 876 877static void 878eli_kill_detached(struct gctl_req *req, const char *prov) 879{ 880 struct g_eli_metadata md; 881 int error; 882 883 /* 884 * NOTE: Maybe we should verify if this is geli provider first, 885 * but 'kill' command is quite critical so better don't waste 886 * the time. 887 */ 888#if 0 889 error = g_metadata_read(prov, (unsigned char *)&md, sizeof(md), 890 G_ELI_MAGIC); 891 if (error != 0) { 892 gctl_error(req, "Cannot read metadata from %s: %s.", prov, 893 strerror(error)); 894 return; 895 } 896#endif 897 898 arc4rand((unsigned char *)&md, sizeof(md)); 899 error = g_metadata_store(prov, (unsigned char *)&md, sizeof(md)); 900 if (error != 0) { 901 gctl_error(req, "Cannot write metadata to %s: %s.", prov, 902 strerror(error)); 903 } 904} 905 906static void 907eli_kill(struct gctl_req *req) 908{ 909 const char *prov; 910 int i, nargs, all; 911 912 nargs = gctl_get_int(req, "nargs"); 913 all = gctl_get_int(req, "all"); 914 if (!all && nargs == 0) { 915 gctl_error(req, "Too few arguments."); 916 return; 917 } 918 /* 919 * How '-a' option combine with a list of providers: 920 * Delete Master Keys from all attached providers: 921 * geli kill -a 922 * Delete Master Keys from all attached provider and from 923 * detached da0 and da1: 924 * geli kill -a da0 da1 925 * Delete Master Keys from (attached or detached) da0 and da1: 926 * geli kill da0 da1 927 */ 928 929 /* 930 * First attached providers. 931 */ 932 gctl_issue(req); 933 /* 934 * Now the rest. 935 */ 936 for (i = 0; i < nargs; i++) { 937 prov = gctl_get_ascii(req, "arg%d", i); 938 if (!eli_is_attached(prov)) 939 eli_kill_detached(req, prov); 940 } 941} 942 943static void 944eli_backup(struct gctl_req *req) 945{ 946 struct g_eli_metadata md; 947 const char *file, *prov; 948 unsigned secsize; 949 unsigned char *sector; 950 off_t mediasize; 951 int nargs, filefd, provfd; 952 953 nargs = gctl_get_int(req, "nargs"); 954 if (nargs != 2) { 955 gctl_error(req, "Invalid number of arguments."); 956 return; 957 } 958 prov = gctl_get_ascii(req, "arg0"); 959 file = gctl_get_ascii(req, "arg1"); 960 961 provfd = filefd = -1; 962 sector = NULL; 963 secsize = 0; 964 965 provfd = open(prov, O_RDONLY); 966 if (provfd == -1 && errno == ENOENT && prov[0] != '/') { 967 char devprov[MAXPATHLEN]; 968 969 snprintf(devprov, sizeof(devprov), "%s%s", _PATH_DEV, prov); 970 provfd = open(devprov, O_RDONLY); 971 } 972 if (provfd == -1) { 973 gctl_error(req, "Cannot open %s: %s.", prov, strerror(errno)); 974 return; 975 } 976 filefd = open(file, O_WRONLY | O_TRUNC | O_CREAT, 0600); 977 if (filefd == -1) { 978 gctl_error(req, "Cannot open %s: %s.", file, strerror(errno)); 979 goto out; 980 } 981 982 mediasize = g_get_mediasize(prov); 983 secsize = g_get_sectorsize(prov); 984 if (mediasize == 0 || secsize == 0) { 985 gctl_error(req, "Cannot get informations about %s: %s.", prov, 986 strerror(errno)); 987 return; 988 } 989 990 sector = malloc(secsize); 991 if (sector == NULL) { 992 gctl_error(req, "Cannot allocate memory."); 993 return; 994 } 995 996 /* Read metadata from the provider. */ 997 if (pread(provfd, sector, secsize, mediasize - secsize) != 998 (ssize_t)secsize) { 999 gctl_error(req, "Cannot read metadata: %s.", strerror(errno)); 1000 goto out; 1001 } 1002 /* Check if this is geli provider. */ 1003 if (eli_metadata_decode(sector, &md) != 0) { 1004 gctl_error(req, "MD5 hash mismatch: not a geli provider?"); 1005 goto out; 1006 } 1007 /* Write metadata to the destination file. */ 1008 if (write(filefd, sector, secsize) != (ssize_t)secsize) { 1009 gctl_error(req, "Cannot write to %s: %s.", file, 1010 strerror(errno)); 1011 goto out; 1012 } 1013out: 1014 if (provfd > 0) 1015 close(provfd); 1016 if (filefd > 0) 1017 close(filefd); 1018 if (sector != NULL) { 1019 bzero(sector, secsize); 1020 free(sector); 1021 } 1022} 1023 1024static void 1025eli_restore(struct gctl_req *req) 1026{ 1027 struct g_eli_metadata md; 1028 const char *file, *prov; 1029 unsigned char *sector; 1030 unsigned secsize; 1031 off_t mediasize; 1032 int nargs, filefd, provfd; 1033 1034 nargs = gctl_get_int(req, "nargs"); 1035 if (nargs != 2) { 1036 gctl_error(req, "Invalid number of arguments."); 1037 return; 1038 } 1039 file = gctl_get_ascii(req, "arg0"); 1040 prov = gctl_get_ascii(req, "arg1"); 1041 1042 provfd = filefd = -1; 1043 sector = NULL; 1044 secsize = 0; 1045 1046 filefd = open(file, O_RDONLY); 1047 if (filefd == -1) { 1048 gctl_error(req, "Cannot open %s: %s.", file, strerror(errno)); 1049 goto out; 1050 } 1051 provfd = open(prov, O_WRONLY); 1052 if (provfd == -1 && errno == ENOENT && prov[0] != '/') { 1053 char devprov[MAXPATHLEN]; 1054 1055 snprintf(devprov, sizeof(devprov), "%s%s", _PATH_DEV, prov); 1056 provfd = open(devprov, O_WRONLY); 1057 } 1058 if (provfd == -1) { 1059 gctl_error(req, "Cannot open %s: %s.", prov, strerror(errno)); 1060 return; 1061 } 1062 1063 mediasize = g_get_mediasize(prov); 1064 secsize = g_get_sectorsize(prov); 1065 if (mediasize == 0 || secsize == 0) { 1066 gctl_error(req, "Cannot get informations about %s: %s.", prov, 1067 strerror(errno)); 1068 return; 1069 } 1070 1071 sector = malloc(secsize); 1072 if (sector == NULL) { 1073 gctl_error(req, "Cannot allocate memory."); 1074 return; 1075 } 1076 1077 /* Read metadata from the backup file. */ 1078 if (read(filefd, sector, secsize) != (ssize_t)secsize) { 1079 gctl_error(req, "Cannot read from %s: %s.", file, 1080 strerror(errno)); 1081 goto out; 1082 } 1083 /* Check if this file contains geli metadata. */ 1084 if (eli_metadata_decode(sector, &md) != 0) { 1085 gctl_error(req, "MD5 hash mismatch: not a geli backup file?"); 1086 goto out; 1087 } 1088 /* Read metadata from the provider. */ 1089 if (pwrite(provfd, sector, secsize, mediasize - secsize) != 1090 (ssize_t)secsize) { 1091 gctl_error(req, "Cannot write metadata: %s.", strerror(errno)); 1092 goto out; 1093 } 1094out: 1095 if (provfd > 0) 1096 close(provfd); 1097 if (filefd > 0) 1098 close(filefd); 1099 if (sector != NULL) { 1100 bzero(sector, secsize); 1101 free(sector); 1102 } 1103} 1104 1105static void 1106eli_clear(struct gctl_req *req) 1107{ 1108 const char *name; 1109 int error, i, nargs; 1110 1111 nargs = gctl_get_int(req, "nargs"); 1112 if (nargs < 1) { 1113 gctl_error(req, "Too few arguments."); 1114 return; 1115 } 1116 1117 for (i = 0; i < nargs; i++) { 1118 name = gctl_get_ascii(req, "arg%d", i); 1119 error = g_metadata_clear(name, G_ELI_MAGIC); 1120 if (error != 0) { 1121 fprintf(stderr, "Cannot clear metadata on %s: %s.\n", 1122 name, strerror(error)); 1123 gctl_error(req, "Not fully done."); 1124 continue; 1125 } 1126 if (verbose) 1127 printf("Metadata cleared on %s.\n", name); 1128 } 1129} 1130 1131static void 1132eli_dump(struct gctl_req *req) 1133{ 1134 struct g_eli_metadata md, tmpmd; 1135 const char *name; 1136 int error, i, nargs; 1137 1138 nargs = gctl_get_int(req, "nargs"); 1139 if (nargs < 1) { 1140 gctl_error(req, "Too few arguments."); 1141 return; 1142 } 1143 1144 for (i = 0; i < nargs; i++) { 1145 name = gctl_get_ascii(req, "arg%d", i); 1146 error = g_metadata_read(name, (unsigned char *)&tmpmd, 1147 sizeof(tmpmd), G_ELI_MAGIC); 1148 if (error != 0) { 1149 fprintf(stderr, "Cannot read metadata from %s: %s.\n", 1150 name, strerror(error)); 1151 gctl_error(req, "Not fully done."); 1152 continue; 1153 } 1154 if (eli_metadata_decode((unsigned char *)&tmpmd, &md) != 0) { 1155 fprintf(stderr, "MD5 hash mismatch for %s, skipping.\n", 1156 name); 1157 gctl_error(req, "Not fully done."); 1158 continue; 1159 } 1160 printf("Metadata on %s:\n", name); 1161 eli_metadata_dump(&md); 1162 printf("\n"); 1163 } 1164} 1165