29 30#include <sys/param.h> 31#include <sys/systm.h> 32#include <sys/kernel.h> 33#include <sys/linker.h> 34#include <sys/module.h> 35#include <sys/lock.h> 36#include <sys/mutex.h> 37#include <sys/bio.h> 38#include <sys/sysctl.h> 39#include <sys/malloc.h> 40#include <sys/eventhandler.h> 41#include <sys/kthread.h> 42#include <sys/proc.h> 43#include <sys/sched.h> 44#include <sys/smp.h> 45#include <sys/uio.h> 46#include <sys/vnode.h> 47 48#include <vm/uma.h> 49 50#include <geom/geom.h> 51#include <geom/eli/g_eli.h> 52#include <geom/eli/pkcs5v2.h> 53 54 55MALLOC_DEFINE(M_ELI, "eli data", "GEOM_ELI Data"); 56 57SYSCTL_DECL(_kern_geom); 58SYSCTL_NODE(_kern_geom, OID_AUTO, eli, CTLFLAG_RW, 0, "GEOM_ELI stuff"); 59u_int g_eli_debug = 0; 60TUNABLE_INT("kern.geom.eli.debug", &g_eli_debug); 61SYSCTL_UINT(_kern_geom_eli, OID_AUTO, debug, CTLFLAG_RW, &g_eli_debug, 0, 62 "Debug level"); 63static u_int g_eli_tries = 3; 64TUNABLE_INT("kern.geom.eli.tries", &g_eli_tries); 65SYSCTL_UINT(_kern_geom_eli, OID_AUTO, tries, CTLFLAG_RW, &g_eli_tries, 0, 66 "Number of tries for entering the passphrase"); 67static u_int g_eli_visible_passphrase = 0; 68TUNABLE_INT("kern.geom.eli.visible_passphrase", &g_eli_visible_passphrase); 69SYSCTL_UINT(_kern_geom_eli, OID_AUTO, visible_passphrase, CTLFLAG_RW, 70 &g_eli_visible_passphrase, 0, 71 "Turn on echo when entering the passphrase (for debug purposes only!!)"); 72u_int g_eli_overwrites = 5; 73TUNABLE_INT("kern.geom.eli.overwrites", &g_eli_overwrites); 74SYSCTL_UINT(_kern_geom_eli, OID_AUTO, overwrites, CTLFLAG_RW, &g_eli_overwrites, 75 0, "Number of times on-disk keys should be overwritten when destroying them"); 76static u_int g_eli_threads = 0; 77TUNABLE_INT("kern.geom.eli.threads", &g_eli_threads); 78SYSCTL_UINT(_kern_geom_eli, OID_AUTO, threads, CTLFLAG_RW, &g_eli_threads, 0, 79 "Number of threads doing crypto work"); 80u_int g_eli_batch = 0; 81TUNABLE_INT("kern.geom.eli.batch", &g_eli_batch); 82SYSCTL_UINT(_kern_geom_eli, OID_AUTO, batch, CTLFLAG_RW, &g_eli_batch, 0, 83 "Use crypto operations batching"); 84 85static eventhandler_tag g_eli_pre_sync = NULL; 86 87static int g_eli_destroy_geom(struct gctl_req *req, struct g_class *mp, 88 struct g_geom *gp); 89static void g_eli_init(struct g_class *mp); 90static void g_eli_fini(struct g_class *mp); 91 92static g_taste_t g_eli_taste; 93static g_dumpconf_t g_eli_dumpconf; 94 95struct g_class g_eli_class = { 96 .name = G_ELI_CLASS_NAME, 97 .version = G_VERSION, 98 .ctlreq = g_eli_config, 99 .taste = g_eli_taste, 100 .destroy_geom = g_eli_destroy_geom, 101 .init = g_eli_init, 102 .fini = g_eli_fini 103}; 104 105 106/* 107 * Code paths: 108 * BIO_READ: 109 * g_eli_start -> g_io_request -> g_eli_read_done -> g_eli_crypto_run -> g_eli_crypto_read_done -> g_io_deliver 110 * BIO_WRITE: 111 * g_eli_start -> g_eli_crypto_run -> g_eli_crypto_write_done -> g_io_request -> g_eli_write_done -> g_io_deliver 112 */ 113 114 115/* 116 * EAGAIN from crypto(9) means, that we were probably balanced to another crypto 117 * accelerator or something like this. 118 * The function updates the SID and rerun the operation. 119 */ 120int 121g_eli_crypto_rerun(struct cryptop *crp) 122{ 123 struct g_eli_softc *sc; 124 struct g_eli_worker *wr; 125 struct bio *bp; 126 int error; 127 128 bp = (struct bio *)crp->crp_opaque; 129 sc = bp->bio_to->geom->softc; 130 LIST_FOREACH(wr, &sc->sc_workers, w_next) { 131 if (wr->w_number == bp->bio_pflags) 132 break; 133 } 134 KASSERT(wr != NULL, ("Invalid worker (%u).", bp->bio_pflags)); 135 G_ELI_DEBUG(1, "Rerunning crypto %s request (sid: %ju -> %ju).", 136 bp->bio_cmd == BIO_READ ? "READ" : "WRITE", (uintmax_t)wr->w_sid, 137 (uintmax_t)crp->crp_sid); 138 wr->w_sid = crp->crp_sid; 139 crp->crp_etype = 0; 140 error = crypto_dispatch(crp); 141 if (error == 0) 142 return (0); 143 G_ELI_DEBUG(1, "%s: crypto_dispatch() returned %d.", __func__, error); 144 crp->crp_etype = error; 145 return (error); 146} 147 148/* 149 * The function is called afer reading encrypted data from the provider. 150 * 151 * g_eli_start -> g_io_request -> G_ELI_READ_DONE -> g_eli_crypto_run -> g_eli_crypto_read_done -> g_io_deliver 152 */ 153void 154g_eli_read_done(struct bio *bp) 155{ 156 struct g_eli_softc *sc; 157 struct bio *pbp; 158 159 G_ELI_LOGREQ(2, bp, "Request done."); 160 pbp = bp->bio_parent; 161 if (pbp->bio_error == 0) 162 pbp->bio_error = bp->bio_error; 163 /* 164 * Do we have all sectors already? 165 */ 166 pbp->bio_inbed++; 167 if (pbp->bio_inbed < pbp->bio_children) 168 return; 169 g_destroy_bio(bp); 170 if (pbp->bio_error != 0) { 171 G_ELI_LOGREQ(0, pbp, "%s() failed", __func__); 172 pbp->bio_completed = 0; 173 if (pbp->bio_driver2 != NULL) { 174 free(pbp->bio_driver2, M_ELI); 175 pbp->bio_driver2 = NULL; 176 } 177 g_io_deliver(pbp, pbp->bio_error); 178 return; 179 } 180 sc = pbp->bio_to->geom->softc; 181 mtx_lock(&sc->sc_queue_mtx); 182 bioq_insert_tail(&sc->sc_queue, pbp); 183 mtx_unlock(&sc->sc_queue_mtx); 184 wakeup(sc); 185} 186 187/* 188 * The function is called after we encrypt and write data. 189 * 190 * g_eli_start -> g_eli_crypto_run -> g_eli_crypto_write_done -> g_io_request -> G_ELI_WRITE_DONE -> g_io_deliver 191 */ 192void 193g_eli_write_done(struct bio *bp) 194{ 195 struct bio *pbp; 196 197 G_ELI_LOGREQ(2, bp, "Request done."); 198 pbp = bp->bio_parent; 199 if (pbp->bio_error == 0) { 200 if (bp->bio_error != 0) 201 pbp->bio_error = bp->bio_error; 202 } 203 /* 204 * Do we have all sectors already? 205 */ 206 pbp->bio_inbed++; 207 if (pbp->bio_inbed < pbp->bio_children) 208 return; 209 free(pbp->bio_driver2, M_ELI); 210 pbp->bio_driver2 = NULL; 211 if (pbp->bio_error != 0) { 212 G_ELI_LOGREQ(0, pbp, "Crypto WRITE request failed (error=%d).", 213 pbp->bio_error); 214 pbp->bio_completed = 0; 215 } 216 g_destroy_bio(bp); 217 /* 218 * Write is finished, send it up. 219 */ 220 pbp->bio_completed = pbp->bio_length; 221 g_io_deliver(pbp, pbp->bio_error); 222} 223 224/* 225 * This function should never be called, but GEOM made as it set ->orphan() 226 * method for every geom. 227 */ 228static void 229g_eli_orphan_spoil_assert(struct g_consumer *cp) 230{ 231 232 panic("Function %s() called for %s.", __func__, cp->geom->name); 233} 234 235static void 236g_eli_orphan(struct g_consumer *cp) 237{ 238 struct g_eli_softc *sc; 239 240 g_topology_assert(); 241 sc = cp->geom->softc; 242 if (sc == NULL) 243 return; 244 g_eli_destroy(sc, 1); 245} 246 247/* 248 * BIO_READ : G_ELI_START -> g_io_request -> g_eli_read_done -> g_eli_crypto_run -> g_eli_crypto_read_done -> g_io_deliver 249 * BIO_WRITE: G_ELI_START -> g_eli_crypto_run -> g_eli_crypto_write_done -> g_io_request -> g_eli_write_done -> g_io_deliver 250 */ 251static void 252g_eli_start(struct bio *bp) 253{ 254 struct g_eli_softc *sc; 255 struct g_consumer *cp; 256 struct bio *cbp; 257 258 sc = bp->bio_to->geom->softc; 259 KASSERT(sc != NULL, 260 ("Provider's error should be set (error=%d)(device=%s).", 261 bp->bio_to->error, bp->bio_to->name)); 262 G_ELI_LOGREQ(2, bp, "Request received."); 263 264 switch (bp->bio_cmd) { 265 case BIO_READ: 266 case BIO_WRITE: 267 case BIO_GETATTR: 268 case BIO_FLUSH: 269 break; 270 case BIO_DELETE: 271 /* 272 * We could eventually support BIO_DELETE request. 273 * It could be done by overwritting requested sector with 274 * random data g_eli_overwrites number of times. 275 */ 276 default: 277 g_io_deliver(bp, EOPNOTSUPP); 278 return; 279 } 280 cbp = g_clone_bio(bp); 281 if (cbp == NULL) { 282 g_io_deliver(bp, ENOMEM); 283 return; 284 } 285 switch (bp->bio_cmd) { 286 case BIO_READ: 287 if (!(sc->sc_flags & G_ELI_FLAG_AUTH)) { 288 bp->bio_driver2 = NULL; 289 cbp->bio_done = g_eli_read_done; 290 cp = LIST_FIRST(&sc->sc_geom->consumer); 291 cbp->bio_to = cp->provider; 292 G_ELI_LOGREQ(2, cbp, "Sending request."); 293 /* 294 * Read encrypted data from provider. 295 */ 296 g_io_request(cbp, cp); 297 break; 298 } 299 bp->bio_pflags = 255; 300 /* FALLTHROUGH */ 301 case BIO_WRITE: 302 bp->bio_driver1 = cbp; 303 mtx_lock(&sc->sc_queue_mtx); 304 bioq_insert_tail(&sc->sc_queue, bp); 305 mtx_unlock(&sc->sc_queue_mtx); 306 wakeup(sc); 307 break; 308 case BIO_GETATTR: 309 case BIO_FLUSH: 310 cbp->bio_done = g_std_done; 311 cp = LIST_FIRST(&sc->sc_geom->consumer); 312 cbp->bio_to = cp->provider; 313 G_ELI_LOGREQ(2, cbp, "Sending request."); 314 g_io_request(cbp, cp); 315 break; 316 } 317} 318 319/* 320 * This is the main function for kernel worker thread when we don't have 321 * hardware acceleration and we have to do cryptography in software. 322 * Dedicated thread is needed, so we don't slow down g_up/g_down GEOM 323 * threads with crypto work. 324 */ 325static void 326g_eli_worker(void *arg) 327{ 328 struct g_eli_softc *sc; 329 struct g_eli_worker *wr; 330 struct bio *bp; 331 332 wr = arg; 333 sc = wr->w_softc; 334#ifdef SMP 335 /* Before sched_bind() to a CPU, wait for all CPUs to go on-line. */ 336 if (mp_ncpus > 1 && sc->sc_crypto == G_ELI_CRYPTO_SW && 337 g_eli_threads == 0) { 338 while (!smp_started) 339 tsleep(wr, 0, "geli:smp", hz / 4); 340 } 341#endif 342 thread_lock(curthread); 343 sched_prio(curthread, PUSER); 344 if (sc->sc_crypto == G_ELI_CRYPTO_SW && g_eli_threads == 0) 345 sched_bind(curthread, wr->w_number); 346 thread_unlock(curthread); 347 348 G_ELI_DEBUG(1, "Thread %s started.", curthread->td_proc->p_comm); 349 350 for (;;) { 351 mtx_lock(&sc->sc_queue_mtx); 352 bp = bioq_takefirst(&sc->sc_queue); 353 if (bp == NULL) { 354 if (sc->sc_flags & G_ELI_FLAG_DESTROY) { 355 LIST_REMOVE(wr, w_next); 356 crypto_freesession(wr->w_sid); 357 free(wr, M_ELI); 358 G_ELI_DEBUG(1, "Thread %s exiting.", 359 curthread->td_proc->p_comm); 360 wakeup(&sc->sc_workers); 361 mtx_unlock(&sc->sc_queue_mtx); 362 kproc_exit(0); 363 } 364 msleep(sc, &sc->sc_queue_mtx, PDROP, "geli:w", 0); 365 continue; 366 } 367 mtx_unlock(&sc->sc_queue_mtx); 368 if (bp->bio_cmd == BIO_READ && bp->bio_pflags == 255) 369 g_eli_auth_read(sc, bp); 370 else if (sc->sc_flags & G_ELI_FLAG_AUTH) 371 g_eli_auth_run(wr, bp); 372 else 373 g_eli_crypto_run(wr, bp); 374 } 375} 376 377/* 378 * Here we generate IV. It is unique for every sector. 379 */ 380void 381g_eli_crypto_ivgen(struct g_eli_softc *sc, off_t offset, u_char *iv, 382 size_t size) 383{ 384 u_char off[8], hash[SHA256_DIGEST_LENGTH]; 385 SHA256_CTX ctx; 386
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550 sc->sc_flags |= G_ELI_FLAG_NATIVE_BYTE_ORDER; 551 sc->sc_ealgo = md->md_ealgo; 552 sc->sc_nkey = nkey; 553 /* 554 * Remember the keys in our softc structure. 555 */ 556 g_eli_mkey_propagate(sc, mkey); 557 sc->sc_ekeylen = md->md_keylen; 558 559 if (sc->sc_flags & G_ELI_FLAG_AUTH) { 560 sc->sc_akeylen = sizeof(sc->sc_akey) * 8; 561 sc->sc_aalgo = md->md_aalgo; 562 sc->sc_alen = g_eli_hashlen(sc->sc_aalgo); 563 564 sc->sc_data_per_sector = bpp->sectorsize - sc->sc_alen; 565 /* 566 * Some hash functions (like SHA1 and RIPEMD160) generates hash 567 * which length is not multiple of 128 bits, but we want data 568 * length to be multiple of 128, so we can encrypt without 569 * padding. The line below rounds down data length to multiple 570 * of 128 bits. 571 */ 572 sc->sc_data_per_sector -= sc->sc_data_per_sector % 16; 573 574 sc->sc_bytes_per_sector = 575 (md->md_sectorsize - 1) / sc->sc_data_per_sector + 1; 576 sc->sc_bytes_per_sector *= bpp->sectorsize; 577 /* 578 * Precalculate SHA256 for HMAC key generation. 579 * This is expensive operation and we can do it only once now or 580 * for every access to sector, so now will be much better. 581 */ 582 SHA256_Init(&sc->sc_akeyctx); 583 SHA256_Update(&sc->sc_akeyctx, sc->sc_akey, 584 sizeof(sc->sc_akey)); 585 } 586 587 /* 588 * Precalculate SHA256 for IV generation. 589 * This is expensive operation and we can do it only once now or for 590 * every access to sector, so now will be much better. 591 */ 592 SHA256_Init(&sc->sc_ivctx); 593 SHA256_Update(&sc->sc_ivctx, sc->sc_ivkey, sizeof(sc->sc_ivkey)); 594 595 gp->softc = sc; 596 sc->sc_geom = gp; 597 598 bioq_init(&sc->sc_queue); 599 mtx_init(&sc->sc_queue_mtx, "geli:queue", NULL, MTX_DEF); 600 601 pp = NULL; 602 cp = g_new_consumer(gp); 603 error = g_attach(cp, bpp); 604 if (error != 0) { 605 if (req != NULL) { 606 gctl_error(req, "Cannot attach to %s (error=%d).", 607 bpp->name, error); 608 } else { 609 G_ELI_DEBUG(1, "Cannot attach to %s (error=%d).", 610 bpp->name, error); 611 } 612 goto failed; 613 } 614 /* 615 * Keep provider open all the time, so we can run critical tasks, 616 * like Master Keys deletion, without wondering if we can open 617 * provider or not. 618 * We don't open provider for writing only when user requested read-only 619 * access. 620 */ 621 if (sc->sc_flags & G_ELI_FLAG_RO) 622 error = g_access(cp, 1, 0, 1); 623 else 624 error = g_access(cp, 1, 1, 1); 625 if (error != 0) { 626 if (req != NULL) { 627 gctl_error(req, "Cannot access %s (error=%d).", 628 bpp->name, error); 629 } else { 630 G_ELI_DEBUG(1, "Cannot access %s (error=%d).", 631 bpp->name, error); 632 } 633 goto failed; 634 } 635 636 LIST_INIT(&sc->sc_workers); 637 638 bzero(&crie, sizeof(crie)); 639 crie.cri_alg = sc->sc_ealgo; 640 crie.cri_klen = sc->sc_ekeylen; 641 crie.cri_key = sc->sc_ekey; 642 if (sc->sc_flags & G_ELI_FLAG_AUTH) { 643 bzero(&cria, sizeof(cria)); 644 cria.cri_alg = sc->sc_aalgo; 645 cria.cri_klen = sc->sc_akeylen; 646 cria.cri_key = sc->sc_akey; 647 crie.cri_next = &cria; 648 } 649 650 threads = g_eli_threads; 651 if (threads == 0) 652 threads = mp_ncpus; 653 else if (threads > mp_ncpus) { 654 /* There is really no need for too many worker threads. */ 655 threads = mp_ncpus; 656 G_ELI_DEBUG(0, "Reducing number of threads to %u.", threads); 657 } 658 for (i = 0; i < threads; i++) { 659 if (g_eli_cpu_is_disabled(i)) { 660 G_ELI_DEBUG(1, "%s: CPU %u disabled, skipping.", 661 bpp->name, i); 662 continue; 663 } 664 wr = malloc(sizeof(*wr), M_ELI, M_WAITOK | M_ZERO); 665 wr->w_softc = sc; 666 wr->w_number = i; 667 668 /* 669 * If this is the first pass, try to get hardware support. 670 * Use software cryptography, if we cannot get it. 671 */ 672 if (LIST_EMPTY(&sc->sc_workers)) { 673 error = crypto_newsession(&wr->w_sid, &crie, 674 CRYPTOCAP_F_HARDWARE); 675 if (error == 0) 676 sc->sc_crypto = G_ELI_CRYPTO_HW; 677 } 678 if (sc->sc_crypto == G_ELI_CRYPTO_SW) { 679 error = crypto_newsession(&wr->w_sid, &crie, 680 CRYPTOCAP_F_SOFTWARE); 681 } 682 if (error != 0) { 683 free(wr, M_ELI); 684 if (req != NULL) { 685 gctl_error(req, "Cannot set up crypto session " 686 "for %s (error=%d).", bpp->name, error); 687 } else { 688 G_ELI_DEBUG(1, "Cannot set up crypto session " 689 "for %s (error=%d).", bpp->name, error); 690 } 691 goto failed; 692 } 693 694 error = kproc_create(g_eli_worker, wr, &wr->w_proc, 0, 0, 695 "g_eli[%u] %s", i, bpp->name); 696 if (error != 0) { 697 crypto_freesession(wr->w_sid); 698 free(wr, M_ELI); 699 if (req != NULL) { 700 gctl_error(req, "Cannot create kernel thread " 701 "for %s (error=%d).", bpp->name, error); 702 } else { 703 G_ELI_DEBUG(1, "Cannot create kernel thread " 704 "for %s (error=%d).", bpp->name, error); 705 } 706 goto failed; 707 } 708 LIST_INSERT_HEAD(&sc->sc_workers, wr, w_next); 709 /* If we have hardware support, one thread is enough. */ 710 if (sc->sc_crypto == G_ELI_CRYPTO_HW) 711 break; 712 } 713 714 /* 715 * Create decrypted provider. 716 */ 717 pp = g_new_providerf(gp, "%s%s", bpp->name, G_ELI_SUFFIX); 718 pp->sectorsize = md->md_sectorsize; 719 pp->mediasize = bpp->mediasize; 720 if (!(sc->sc_flags & G_ELI_FLAG_ONETIME)) 721 pp->mediasize -= bpp->sectorsize; 722 if (!(sc->sc_flags & G_ELI_FLAG_AUTH)) 723 pp->mediasize -= (pp->mediasize % pp->sectorsize); 724 else { 725 pp->mediasize /= sc->sc_bytes_per_sector; 726 pp->mediasize *= pp->sectorsize; 727 } 728 729 g_error_provider(pp, 0); 730 731 G_ELI_DEBUG(0, "Device %s created.", pp->name); 732 G_ELI_DEBUG(0, "Encryption: %s %u", g_eli_algo2str(sc->sc_ealgo), 733 sc->sc_ekeylen); 734 if (sc->sc_flags & G_ELI_FLAG_AUTH) 735 G_ELI_DEBUG(0, " Integrity: %s", g_eli_algo2str(sc->sc_aalgo)); 736 G_ELI_DEBUG(0, " Crypto: %s", 737 sc->sc_crypto == G_ELI_CRYPTO_SW ? "software" : "hardware"); 738 return (gp); 739failed: 740 mtx_lock(&sc->sc_queue_mtx); 741 sc->sc_flags |= G_ELI_FLAG_DESTROY; 742 wakeup(sc); 743 /* 744 * Wait for kernel threads self destruction. 745 */ 746 while (!LIST_EMPTY(&sc->sc_workers)) { 747 msleep(&sc->sc_workers, &sc->sc_queue_mtx, PRIBIO, 748 "geli:destroy", 0); 749 } 750 mtx_destroy(&sc->sc_queue_mtx); 751 if (cp->provider != NULL) { 752 if (cp->acr == 1) 753 g_access(cp, -1, -1, -1); 754 g_detach(cp); 755 } 756 g_destroy_consumer(cp); 757 g_destroy_geom(gp); 758 bzero(sc, sizeof(*sc)); 759 free(sc, M_ELI); 760 return (NULL); 761} 762 763int 764g_eli_destroy(struct g_eli_softc *sc, boolean_t force) 765{ 766 struct g_geom *gp; 767 struct g_provider *pp; 768 769 g_topology_assert(); 770 771 if (sc == NULL) 772 return (ENXIO); 773 774 gp = sc->sc_geom; 775 pp = LIST_FIRST(&gp->provider); 776 if (pp != NULL && (pp->acr != 0 || pp->acw != 0 || pp->ace != 0)) { 777 if (force) { 778 G_ELI_DEBUG(1, "Device %s is still open, so it " 779 "cannot be definitely removed.", pp->name); 780 } else { 781 G_ELI_DEBUG(1, 782 "Device %s is still open (r%dw%de%d).", pp->name, 783 pp->acr, pp->acw, pp->ace); 784 return (EBUSY); 785 } 786 } 787 788 mtx_lock(&sc->sc_queue_mtx); 789 sc->sc_flags |= G_ELI_FLAG_DESTROY; 790 wakeup(sc); 791 while (!LIST_EMPTY(&sc->sc_workers)) { 792 msleep(&sc->sc_workers, &sc->sc_queue_mtx, PRIBIO, 793 "geli:destroy", 0); 794 } 795 mtx_destroy(&sc->sc_queue_mtx); 796 gp->softc = NULL; 797 bzero(sc, sizeof(*sc)); 798 free(sc, M_ELI); 799 800 if (pp == NULL || (pp->acr == 0 && pp->acw == 0 && pp->ace == 0)) 801 G_ELI_DEBUG(0, "Device %s destroyed.", gp->name); 802 g_wither_geom_close(gp, ENXIO); 803 804 return (0); 805} 806 807static int 808g_eli_destroy_geom(struct gctl_req *req __unused, 809 struct g_class *mp __unused, struct g_geom *gp) 810{ 811 struct g_eli_softc *sc; 812 813 sc = gp->softc; 814 return (g_eli_destroy(sc, 0)); 815} 816 817static int 818g_eli_keyfiles_load(struct hmac_ctx *ctx, const char *provider) 819{ 820 u_char *keyfile, *data, *size; 821 char *file, name[64]; 822 int i; 823 824 for (i = 0; ; i++) { 825 snprintf(name, sizeof(name), "%s:geli_keyfile%d", provider, i); 826 keyfile = preload_search_by_type(name); 827 if (keyfile == NULL) 828 return (i); /* Return number of loaded keyfiles. */ 829 data = preload_search_info(keyfile, MODINFO_ADDR); 830 if (data == NULL) { 831 G_ELI_DEBUG(0, "Cannot find key file data for %s.", 832 name); 833 return (0); 834 } 835 data = *(void **)data; 836 size = preload_search_info(keyfile, MODINFO_SIZE); 837 if (size == NULL) { 838 G_ELI_DEBUG(0, "Cannot find key file size for %s.", 839 name); 840 return (0); 841 } 842 file = preload_search_info(keyfile, MODINFO_NAME); 843 if (file == NULL) { 844 G_ELI_DEBUG(0, "Cannot find key file name for %s.", 845 name); 846 return (0); 847 } 848 G_ELI_DEBUG(1, "Loaded keyfile %s for %s (type: %s).", file, 849 provider, name); 850 g_eli_crypto_hmac_update(ctx, data, *(size_t *)size); 851 } 852} 853 854static void 855g_eli_keyfiles_clear(const char *provider) 856{ 857 u_char *keyfile, *data, *size; 858 char name[64]; 859 int i; 860 861 for (i = 0; ; i++) { 862 snprintf(name, sizeof(name), "%s:geli_keyfile%d", provider, i); 863 keyfile = preload_search_by_type(name); 864 if (keyfile == NULL) 865 return; 866 data = preload_search_info(keyfile, MODINFO_ADDR); 867 size = preload_search_info(keyfile, MODINFO_SIZE); 868 if (data == NULL || size == NULL) 869 continue; 870 data = *(void **)data; 871 bzero(data, *(size_t *)size); 872 } 873} 874 875/* 876 * Tasting is only made on boot. 877 * We detect providers which should be attached before root is mounted. 878 */ 879static struct g_geom * 880g_eli_taste(struct g_class *mp, struct g_provider *pp, int flags __unused) 881{ 882 struct g_eli_metadata md; 883 struct g_geom *gp; 884 struct hmac_ctx ctx; 885 char passphrase[256]; 886 u_char key[G_ELI_USERKEYLEN], mkey[G_ELI_DATAIVKEYLEN]; 887 u_int i, nkey, nkeyfiles, tries; 888 int error; 889 890 g_trace(G_T_TOPOLOGY, "%s(%s, %s)", __func__, mp->name, pp->name); 891 g_topology_assert(); 892 893 if (root_mounted() || g_eli_tries == 0) 894 return (NULL); 895 896 G_ELI_DEBUG(3, "Tasting %s.", pp->name); 897 898 error = g_eli_read_metadata(mp, pp, &md); 899 if (error != 0) 900 return (NULL); 901 gp = NULL; 902 903 if (strcmp(md.md_magic, G_ELI_MAGIC) != 0) 904 return (NULL); 905 if (md.md_version > G_ELI_VERSION) { 906 printf("geom_eli.ko module is too old to handle %s.\n", 907 pp->name); 908 return (NULL); 909 } 910 if (md.md_provsize != pp->mediasize) 911 return (NULL); 912 /* Should we attach it on boot? */ 913 if (!(md.md_flags & G_ELI_FLAG_BOOT)) 914 return (NULL); 915 if (md.md_keys == 0x00) { 916 G_ELI_DEBUG(0, "No valid keys on %s.", pp->name); 917 return (NULL); 918 } 919 if (md.md_iterations == -1) { 920 /* If there is no passphrase, we try only once. */ 921 tries = 1; 922 } else { 923 /* Ask for the passphrase no more than g_eli_tries times. */ 924 tries = g_eli_tries; 925 } 926 927 for (i = 0; i < tries; i++) { 928 g_eli_crypto_hmac_init(&ctx, NULL, 0); 929 930 /* 931 * Load all key files. 932 */ 933 nkeyfiles = g_eli_keyfiles_load(&ctx, pp->name); 934 935 if (nkeyfiles == 0 && md.md_iterations == -1) { 936 /* 937 * No key files and no passphrase, something is 938 * definitely wrong here. 939 * geli(8) doesn't allow for such situation, so assume 940 * that there was really no passphrase and in that case 941 * key files are no properly defined in loader.conf. 942 */ 943 G_ELI_DEBUG(0, 944 "Found no key files in loader.conf for %s.", 945 pp->name); 946 return (NULL); 947 } 948 949 /* Ask for the passphrase if defined. */ 950 if (md.md_iterations >= 0) { 951 printf("Enter passphrase for %s: ", pp->name); 952 gets(passphrase, sizeof(passphrase), 953 g_eli_visible_passphrase); 954 } 955 956 /* 957 * Prepare Derived-Key from the user passphrase. 958 */ 959 if (md.md_iterations == 0) { 960 g_eli_crypto_hmac_update(&ctx, md.md_salt, 961 sizeof(md.md_salt)); 962 g_eli_crypto_hmac_update(&ctx, passphrase, 963 strlen(passphrase)); 964 bzero(passphrase, sizeof(passphrase)); 965 } else if (md.md_iterations > 0) { 966 u_char dkey[G_ELI_USERKEYLEN]; 967 968 pkcs5v2_genkey(dkey, sizeof(dkey), md.md_salt, 969 sizeof(md.md_salt), passphrase, md.md_iterations); 970 bzero(passphrase, sizeof(passphrase)); 971 g_eli_crypto_hmac_update(&ctx, dkey, sizeof(dkey)); 972 bzero(dkey, sizeof(dkey)); 973 } 974 975 g_eli_crypto_hmac_final(&ctx, key, 0); 976 977 /* 978 * Decrypt Master-Key. 979 */ 980 error = g_eli_mkey_decrypt(&md, key, mkey, &nkey); 981 bzero(key, sizeof(key)); 982 if (error == -1) { 983 if (i == tries - 1) { 984 G_ELI_DEBUG(0, 985 "Wrong key for %s. No tries left.", 986 pp->name); 987 g_eli_keyfiles_clear(pp->name); 988 return (NULL); 989 } 990 G_ELI_DEBUG(0, "Wrong key for %s. Tries left: %u.", 991 pp->name, tries - i - 1); 992 /* Try again. */ 993 continue; 994 } else if (error > 0) { 995 G_ELI_DEBUG(0, "Cannot decrypt Master Key for %s (error=%d).", 996 pp->name, error); 997 g_eli_keyfiles_clear(pp->name); 998 return (NULL); 999 } 1000 G_ELI_DEBUG(1, "Using Master Key %u for %s.", nkey, pp->name); 1001 break; 1002 } 1003 1004 /* 1005 * We have correct key, let's attach provider. 1006 */ 1007 gp = g_eli_create(NULL, mp, pp, &md, mkey, nkey); 1008 bzero(mkey, sizeof(mkey)); 1009 bzero(&md, sizeof(md)); 1010 if (gp == NULL) { 1011 G_ELI_DEBUG(0, "Cannot create device %s%s.", pp->name, 1012 G_ELI_SUFFIX); 1013 return (NULL); 1014 } 1015 return (gp); 1016} 1017 1018static void 1019g_eli_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, 1020 struct g_consumer *cp, struct g_provider *pp) 1021{ 1022 struct g_eli_softc *sc; 1023 1024 g_topology_assert(); 1025 sc = gp->softc; 1026 if (sc == NULL) 1027 return; 1028 if (pp != NULL || cp != NULL) 1029 return; /* Nothing here. */ 1030 sbuf_printf(sb, "%s<Flags>", indent); 1031 if (sc->sc_flags == 0) 1032 sbuf_printf(sb, "NONE"); 1033 else { 1034 int first = 1; 1035 1036#define ADD_FLAG(flag, name) do { \ 1037 if (sc->sc_flags & (flag)) { \ 1038 if (!first) \ 1039 sbuf_printf(sb, ", "); \ 1040 else \ 1041 first = 0; \ 1042 sbuf_printf(sb, name); \ 1043 } \ 1044} while (0) 1045 ADD_FLAG(G_ELI_FLAG_NATIVE_BYTE_ORDER, "NATIVE-BYTE-ORDER"); 1046 ADD_FLAG(G_ELI_FLAG_ONETIME, "ONETIME"); 1047 ADD_FLAG(G_ELI_FLAG_BOOT, "BOOT"); 1048 ADD_FLAG(G_ELI_FLAG_WO_DETACH, "W-DETACH"); 1049 ADD_FLAG(G_ELI_FLAG_RW_DETACH, "RW-DETACH"); 1050 ADD_FLAG(G_ELI_FLAG_AUTH, "AUTH"); 1051 ADD_FLAG(G_ELI_FLAG_WOPEN, "W-OPEN"); 1052 ADD_FLAG(G_ELI_FLAG_DESTROY, "DESTROY"); 1053 ADD_FLAG(G_ELI_FLAG_RO, "READ-ONLY"); 1054#undef ADD_FLAG 1055 } 1056 sbuf_printf(sb, "</Flags>\n"); 1057 1058 if (!(sc->sc_flags & G_ELI_FLAG_ONETIME)) { 1059 sbuf_printf(sb, "%s<UsedKey>%u</UsedKey>\n", indent, 1060 sc->sc_nkey); 1061 } 1062 sbuf_printf(sb, "%s<Crypto>", indent); 1063 switch (sc->sc_crypto) { 1064 case G_ELI_CRYPTO_HW: 1065 sbuf_printf(sb, "hardware"); 1066 break; 1067 case G_ELI_CRYPTO_SW: 1068 sbuf_printf(sb, "software"); 1069 break; 1070 default: 1071 sbuf_printf(sb, "UNKNOWN"); 1072 break; 1073 } 1074 sbuf_printf(sb, "</Crypto>\n"); 1075 if (sc->sc_flags & G_ELI_FLAG_AUTH) { 1076 sbuf_printf(sb, 1077 "%s<AuthenticationAlgorithm>%s</AuthenticationAlgorithm>\n", 1078 indent, g_eli_algo2str(sc->sc_aalgo)); 1079 } 1080 sbuf_printf(sb, "%s<KeyLength>%u</KeyLength>\n", indent, 1081 sc->sc_ekeylen); 1082 sbuf_printf(sb, "%s<EncryptionAlgorithm>%s</EncryptionAlgorithm>\n", indent, 1083 g_eli_algo2str(sc->sc_ealgo)); 1084} 1085 1086static void 1087g_eli_shutdown_pre_sync(void *arg, int howto) 1088{ 1089 struct g_class *mp; 1090 struct g_geom *gp, *gp2; 1091 struct g_provider *pp; 1092 struct g_eli_softc *sc; 1093 int error; 1094 1095 mp = arg; 1096 DROP_GIANT(); 1097 g_topology_lock(); 1098 LIST_FOREACH_SAFE(gp, &mp->geom, geom, gp2) { 1099 sc = gp->softc; 1100 if (sc == NULL) 1101 continue; 1102 pp = LIST_FIRST(&gp->provider); 1103 KASSERT(pp != NULL, ("No provider? gp=%p (%s)", gp, gp->name)); 1104 if (pp->acr + pp->acw + pp->ace == 0) 1105 error = g_eli_destroy(sc, 1); 1106 else { 1107 sc->sc_flags |= G_ELI_FLAG_RW_DETACH; 1108 gp->access = g_eli_access; 1109 } 1110 } 1111 g_topology_unlock(); 1112 PICKUP_GIANT(); 1113} 1114 1115static void 1116g_eli_init(struct g_class *mp) 1117{ 1118 1119 g_eli_pre_sync = EVENTHANDLER_REGISTER(shutdown_pre_sync, 1120 g_eli_shutdown_pre_sync, mp, SHUTDOWN_PRI_FIRST); 1121 if (g_eli_pre_sync == NULL) 1122 G_ELI_DEBUG(0, "Warning! Cannot register shutdown event."); 1123} 1124 1125static void 1126g_eli_fini(struct g_class *mp) 1127{ 1128 1129 if (g_eli_pre_sync != NULL) 1130 EVENTHANDLER_DEREGISTER(shutdown_pre_sync, g_eli_pre_sync); 1131} 1132 1133DECLARE_GEOM_CLASS(g_eli_class, g_eli); 1134MODULE_DEPEND(g_eli, crypto, 1, 1, 1);
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