g_eli.c revision 285263
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 27#include <sys/cdefs.h> 28__FBSDID("$FreeBSD: stable/10/sys/geom/eli/g_eli.c 285263 2015-07-08 09:54:17Z gjb $"); 29 30#include <sys/param.h> 31#include <sys/systm.h> 32#include <sys/cons.h> 33#include <sys/kernel.h> 34#include <sys/linker.h> 35#include <sys/module.h> 36#include <sys/lock.h> 37#include <sys/mutex.h> 38#include <sys/bio.h> 39#include <sys/sbuf.h> 40#include <sys/sysctl.h> 41#include <sys/malloc.h> 42#include <sys/eventhandler.h> 43#include <sys/kthread.h> 44#include <sys/proc.h> 45#include <sys/sched.h> 46#include <sys/smp.h> 47#include <sys/uio.h> 48#include <sys/vnode.h> 49 50#include <vm/uma.h> 51 52#include <geom/geom.h> 53#include <geom/eli/g_eli.h> 54#include <geom/eli/pkcs5v2.h> 55 56FEATURE(geom_eli, "GEOM crypto module"); 57 58MALLOC_DEFINE(M_ELI, "eli data", "GEOM_ELI Data"); 59 60SYSCTL_DECL(_kern_geom); 61SYSCTL_NODE(_kern_geom, OID_AUTO, eli, CTLFLAG_RW, 0, "GEOM_ELI stuff"); 62static int g_eli_version = G_ELI_VERSION; 63SYSCTL_INT(_kern_geom_eli, OID_AUTO, version, CTLFLAG_RD, &g_eli_version, 0, 64 "GELI version"); 65int g_eli_debug = 0; 66TUNABLE_INT("kern.geom.eli.debug", &g_eli_debug); 67SYSCTL_INT(_kern_geom_eli, OID_AUTO, debug, CTLFLAG_RW, &g_eli_debug, 0, 68 "Debug level"); 69static u_int g_eli_tries = 3; 70TUNABLE_INT("kern.geom.eli.tries", &g_eli_tries); 71SYSCTL_UINT(_kern_geom_eli, OID_AUTO, tries, CTLFLAG_RW, &g_eli_tries, 0, 72 "Number of tries for entering the passphrase"); 73static u_int g_eli_visible_passphrase = GETS_NOECHO; 74TUNABLE_INT("kern.geom.eli.visible_passphrase", &g_eli_visible_passphrase); 75SYSCTL_UINT(_kern_geom_eli, OID_AUTO, visible_passphrase, CTLFLAG_RW, 76 &g_eli_visible_passphrase, 0, 77 "Visibility of passphrase prompt (0 = invisible, 1 = visible, 2 = asterisk)"); 78u_int g_eli_overwrites = G_ELI_OVERWRITES; 79TUNABLE_INT("kern.geom.eli.overwrites", &g_eli_overwrites); 80SYSCTL_UINT(_kern_geom_eli, OID_AUTO, overwrites, CTLFLAG_RW, &g_eli_overwrites, 81 0, "Number of times on-disk keys should be overwritten when destroying them"); 82static u_int g_eli_threads = 0; 83TUNABLE_INT("kern.geom.eli.threads", &g_eli_threads); 84SYSCTL_UINT(_kern_geom_eli, OID_AUTO, threads, CTLFLAG_RW, &g_eli_threads, 0, 85 "Number of threads doing crypto work"); 86u_int g_eli_batch = 0; 87TUNABLE_INT("kern.geom.eli.batch", &g_eli_batch); 88SYSCTL_UINT(_kern_geom_eli, OID_AUTO, batch, CTLFLAG_RW, &g_eli_batch, 0, 89 "Use crypto operations batching"); 90 91/* 92 * Passphrase cached during boot, in order to be more user-friendly if 93 * there are multiple providers using the same passphrase. 94 */ 95static char cached_passphrase[256]; 96static u_int g_eli_boot_passcache = 1; 97TUNABLE_INT("kern.geom.eli.boot_passcache", &g_eli_boot_passcache); 98SYSCTL_UINT(_kern_geom_eli, OID_AUTO, boot_passcache, CTLFLAG_RD, 99 &g_eli_boot_passcache, 0, 100 "Passphrases are cached during boot process for possible reuse"); 101static void 102fetch_loader_passphrase(void * dummy) 103{ 104 char * env_passphrase; 105 106 KASSERT(dynamic_kenv, ("need dynamic kenv")); 107 108 if ((env_passphrase = getenv("kern.geom.eli.passphrase")) != NULL) { 109 /* Extract passphrase from the environment. */ 110 strlcpy(cached_passphrase, env_passphrase, 111 sizeof(cached_passphrase)); 112 freeenv(env_passphrase); 113 114 /* Wipe the passphrase from the environment. */ 115 unsetenv("kern.geom.eli.passphrase"); 116 } 117} 118SYSINIT(geli_fetch_loader_passphrase, SI_SUB_KMEM + 1, SI_ORDER_ANY, 119 fetch_loader_passphrase, NULL); 120static void 121zero_boot_passcache(void * dummy) 122{ 123 124 memset(cached_passphrase, 0, sizeof(cached_passphrase)); 125} 126EVENTHANDLER_DEFINE(mountroot, zero_boot_passcache, NULL, 0); 127 128static eventhandler_tag g_eli_pre_sync = NULL; 129 130static int g_eli_destroy_geom(struct gctl_req *req, struct g_class *mp, 131 struct g_geom *gp); 132static void g_eli_init(struct g_class *mp); 133static void g_eli_fini(struct g_class *mp); 134 135static g_taste_t g_eli_taste; 136static g_dumpconf_t g_eli_dumpconf; 137 138struct g_class g_eli_class = { 139 .name = G_ELI_CLASS_NAME, 140 .version = G_VERSION, 141 .ctlreq = g_eli_config, 142 .taste = g_eli_taste, 143 .destroy_geom = g_eli_destroy_geom, 144 .init = g_eli_init, 145 .fini = g_eli_fini 146}; 147 148 149/* 150 * Code paths: 151 * BIO_READ: 152 * g_eli_start -> g_eli_crypto_read -> g_io_request -> g_eli_read_done -> g_eli_crypto_run -> g_eli_crypto_read_done -> g_io_deliver 153 * BIO_WRITE: 154 * g_eli_start -> g_eli_crypto_run -> g_eli_crypto_write_done -> g_io_request -> g_eli_write_done -> g_io_deliver 155 */ 156 157 158/* 159 * EAGAIN from crypto(9) means, that we were probably balanced to another crypto 160 * accelerator or something like this. 161 * The function updates the SID and rerun the operation. 162 */ 163int 164g_eli_crypto_rerun(struct cryptop *crp) 165{ 166 struct g_eli_softc *sc; 167 struct g_eli_worker *wr; 168 struct bio *bp; 169 int error; 170 171 bp = (struct bio *)crp->crp_opaque; 172 sc = bp->bio_to->geom->softc; 173 LIST_FOREACH(wr, &sc->sc_workers, w_next) { 174 if (wr->w_number == bp->bio_pflags) 175 break; 176 } 177 KASSERT(wr != NULL, ("Invalid worker (%u).", bp->bio_pflags)); 178 G_ELI_DEBUG(1, "Rerunning crypto %s request (sid: %ju -> %ju).", 179 bp->bio_cmd == BIO_READ ? "READ" : "WRITE", (uintmax_t)wr->w_sid, 180 (uintmax_t)crp->crp_sid); 181 wr->w_sid = crp->crp_sid; 182 crp->crp_etype = 0; 183 error = crypto_dispatch(crp); 184 if (error == 0) 185 return (0); 186 G_ELI_DEBUG(1, "%s: crypto_dispatch() returned %d.", __func__, error); 187 crp->crp_etype = error; 188 return (error); 189} 190 191/* 192 * The function is called afer reading encrypted data from the provider. 193 * 194 * g_eli_start -> g_eli_crypto_read -> g_io_request -> G_ELI_READ_DONE -> g_eli_crypto_run -> g_eli_crypto_read_done -> g_io_deliver 195 */ 196void 197g_eli_read_done(struct bio *bp) 198{ 199 struct g_eli_softc *sc; 200 struct bio *pbp; 201 202 G_ELI_LOGREQ(2, bp, "Request done."); 203 pbp = bp->bio_parent; 204 if (pbp->bio_error == 0) 205 pbp->bio_error = bp->bio_error; 206 g_destroy_bio(bp); 207 /* 208 * Do we have all sectors already? 209 */ 210 pbp->bio_inbed++; 211 if (pbp->bio_inbed < pbp->bio_children) 212 return; 213 sc = pbp->bio_to->geom->softc; 214 if (pbp->bio_error != 0) { 215 G_ELI_LOGREQ(0, pbp, "%s() failed", __func__); 216 pbp->bio_completed = 0; 217 if (pbp->bio_driver2 != NULL) { 218 free(pbp->bio_driver2, M_ELI); 219 pbp->bio_driver2 = NULL; 220 } 221 g_io_deliver(pbp, pbp->bio_error); 222 atomic_subtract_int(&sc->sc_inflight, 1); 223 return; 224 } 225 mtx_lock(&sc->sc_queue_mtx); 226 bioq_insert_tail(&sc->sc_queue, pbp); 227 mtx_unlock(&sc->sc_queue_mtx); 228 wakeup(sc); 229} 230 231/* 232 * The function is called after we encrypt and write data. 233 * 234 * g_eli_start -> g_eli_crypto_run -> g_eli_crypto_write_done -> g_io_request -> G_ELI_WRITE_DONE -> g_io_deliver 235 */ 236void 237g_eli_write_done(struct bio *bp) 238{ 239 struct g_eli_softc *sc; 240 struct bio *pbp; 241 242 G_ELI_LOGREQ(2, bp, "Request done."); 243 pbp = bp->bio_parent; 244 if (pbp->bio_error == 0) { 245 if (bp->bio_error != 0) 246 pbp->bio_error = bp->bio_error; 247 } 248 g_destroy_bio(bp); 249 /* 250 * Do we have all sectors already? 251 */ 252 pbp->bio_inbed++; 253 if (pbp->bio_inbed < pbp->bio_children) 254 return; 255 free(pbp->bio_driver2, M_ELI); 256 pbp->bio_driver2 = NULL; 257 if (pbp->bio_error != 0) { 258 G_ELI_LOGREQ(0, pbp, "Crypto WRITE request failed (error=%d).", 259 pbp->bio_error); 260 pbp->bio_completed = 0; 261 } 262 /* 263 * Write is finished, send it up. 264 */ 265 pbp->bio_completed = pbp->bio_length; 266 sc = pbp->bio_to->geom->softc; 267 g_io_deliver(pbp, pbp->bio_error); 268 atomic_subtract_int(&sc->sc_inflight, 1); 269} 270 271/* 272 * This function should never be called, but GEOM made as it set ->orphan() 273 * method for every geom. 274 */ 275static void 276g_eli_orphan_spoil_assert(struct g_consumer *cp) 277{ 278 279 panic("Function %s() called for %s.", __func__, cp->geom->name); 280} 281 282static void 283g_eli_orphan(struct g_consumer *cp) 284{ 285 struct g_eli_softc *sc; 286 287 g_topology_assert(); 288 sc = cp->geom->softc; 289 if (sc == NULL) 290 return; 291 g_eli_destroy(sc, TRUE); 292} 293 294/* 295 * BIO_READ: 296 * G_ELI_START -> g_eli_crypto_read -> g_io_request -> g_eli_read_done -> g_eli_crypto_run -> g_eli_crypto_read_done -> g_io_deliver 297 * BIO_WRITE: 298 * G_ELI_START -> g_eli_crypto_run -> g_eli_crypto_write_done -> g_io_request -> g_eli_write_done -> g_io_deliver 299 */ 300static void 301g_eli_start(struct bio *bp) 302{ 303 struct g_eli_softc *sc; 304 struct g_consumer *cp; 305 struct bio *cbp; 306 307 sc = bp->bio_to->geom->softc; 308 KASSERT(sc != NULL, 309 ("Provider's error should be set (error=%d)(device=%s).", 310 bp->bio_to->error, bp->bio_to->name)); 311 G_ELI_LOGREQ(2, bp, "Request received."); 312 313 switch (bp->bio_cmd) { 314 case BIO_READ: 315 case BIO_WRITE: 316 case BIO_GETATTR: 317 case BIO_FLUSH: 318 break; 319 case BIO_DELETE: 320 /* 321 * We could eventually support BIO_DELETE request. 322 * It could be done by overwritting requested sector with 323 * random data g_eli_overwrites number of times. 324 */ 325 default: 326 g_io_deliver(bp, EOPNOTSUPP); 327 return; 328 } 329 cbp = g_clone_bio(bp); 330 if (cbp == NULL) { 331 g_io_deliver(bp, ENOMEM); 332 return; 333 } 334 bp->bio_driver1 = cbp; 335 bp->bio_pflags = G_ELI_NEW_BIO; 336 switch (bp->bio_cmd) { 337 case BIO_READ: 338 if (!(sc->sc_flags & G_ELI_FLAG_AUTH)) { 339 g_eli_crypto_read(sc, bp, 0); 340 break; 341 } 342 /* FALLTHROUGH */ 343 case BIO_WRITE: 344 mtx_lock(&sc->sc_queue_mtx); 345 bioq_insert_tail(&sc->sc_queue, bp); 346 mtx_unlock(&sc->sc_queue_mtx); 347 wakeup(sc); 348 break; 349 case BIO_GETATTR: 350 case BIO_FLUSH: 351 cbp->bio_done = g_std_done; 352 cp = LIST_FIRST(&sc->sc_geom->consumer); 353 cbp->bio_to = cp->provider; 354 G_ELI_LOGREQ(2, cbp, "Sending request."); 355 g_io_request(cbp, cp); 356 break; 357 } 358} 359 360static int 361g_eli_newsession(struct g_eli_worker *wr) 362{ 363 struct g_eli_softc *sc; 364 struct cryptoini crie, cria; 365 int error; 366 367 sc = wr->w_softc; 368 369 bzero(&crie, sizeof(crie)); 370 crie.cri_alg = sc->sc_ealgo; 371 crie.cri_klen = sc->sc_ekeylen; 372 if (sc->sc_ealgo == CRYPTO_AES_XTS) 373 crie.cri_klen <<= 1; 374 if ((sc->sc_flags & G_ELI_FLAG_FIRST_KEY) != 0) { 375 crie.cri_key = g_eli_key_hold(sc, 0, 376 LIST_FIRST(&sc->sc_geom->consumer)->provider->sectorsize); 377 } else { 378 crie.cri_key = sc->sc_ekey; 379 } 380 if (sc->sc_flags & G_ELI_FLAG_AUTH) { 381 bzero(&cria, sizeof(cria)); 382 cria.cri_alg = sc->sc_aalgo; 383 cria.cri_klen = sc->sc_akeylen; 384 cria.cri_key = sc->sc_akey; 385 crie.cri_next = &cria; 386 } 387 388 switch (sc->sc_crypto) { 389 case G_ELI_CRYPTO_SW: 390 error = crypto_newsession(&wr->w_sid, &crie, 391 CRYPTOCAP_F_SOFTWARE); 392 break; 393 case G_ELI_CRYPTO_HW: 394 error = crypto_newsession(&wr->w_sid, &crie, 395 CRYPTOCAP_F_HARDWARE); 396 break; 397 case G_ELI_CRYPTO_UNKNOWN: 398 error = crypto_newsession(&wr->w_sid, &crie, 399 CRYPTOCAP_F_HARDWARE); 400 if (error == 0) { 401 mtx_lock(&sc->sc_queue_mtx); 402 if (sc->sc_crypto == G_ELI_CRYPTO_UNKNOWN) 403 sc->sc_crypto = G_ELI_CRYPTO_HW; 404 mtx_unlock(&sc->sc_queue_mtx); 405 } else { 406 error = crypto_newsession(&wr->w_sid, &crie, 407 CRYPTOCAP_F_SOFTWARE); 408 mtx_lock(&sc->sc_queue_mtx); 409 if (sc->sc_crypto == G_ELI_CRYPTO_UNKNOWN) 410 sc->sc_crypto = G_ELI_CRYPTO_SW; 411 mtx_unlock(&sc->sc_queue_mtx); 412 } 413 break; 414 default: 415 panic("%s: invalid condition", __func__); 416 } 417 418 if ((sc->sc_flags & G_ELI_FLAG_FIRST_KEY) != 0) 419 g_eli_key_drop(sc, crie.cri_key); 420 421 return (error); 422} 423 424static void 425g_eli_freesession(struct g_eli_worker *wr) 426{ 427 428 crypto_freesession(wr->w_sid); 429} 430 431static void 432g_eli_cancel(struct g_eli_softc *sc) 433{ 434 struct bio *bp; 435 436 mtx_assert(&sc->sc_queue_mtx, MA_OWNED); 437 438 while ((bp = bioq_takefirst(&sc->sc_queue)) != NULL) { 439 KASSERT(bp->bio_pflags == G_ELI_NEW_BIO, 440 ("Not new bio when canceling (bp=%p).", bp)); 441 g_io_deliver(bp, ENXIO); 442 } 443} 444 445static struct bio * 446g_eli_takefirst(struct g_eli_softc *sc) 447{ 448 struct bio *bp; 449 450 mtx_assert(&sc->sc_queue_mtx, MA_OWNED); 451 452 if (!(sc->sc_flags & G_ELI_FLAG_SUSPEND)) 453 return (bioq_takefirst(&sc->sc_queue)); 454 /* 455 * Device suspended, so we skip new I/O requests. 456 */ 457 TAILQ_FOREACH(bp, &sc->sc_queue.queue, bio_queue) { 458 if (bp->bio_pflags != G_ELI_NEW_BIO) 459 break; 460 } 461 if (bp != NULL) 462 bioq_remove(&sc->sc_queue, bp); 463 return (bp); 464} 465 466/* 467 * This is the main function for kernel worker thread when we don't have 468 * hardware acceleration and we have to do cryptography in software. 469 * Dedicated thread is needed, so we don't slow down g_up/g_down GEOM 470 * threads with crypto work. 471 */ 472static void 473g_eli_worker(void *arg) 474{ 475 struct g_eli_softc *sc; 476 struct g_eli_worker *wr; 477 struct bio *bp; 478 int error; 479 480 wr = arg; 481 sc = wr->w_softc; 482#ifdef SMP 483 /* Before sched_bind() to a CPU, wait for all CPUs to go on-line. */ 484 if (sc->sc_cpubind) { 485 while (!smp_started) 486 tsleep(wr, 0, "geli:smp", hz / 4); 487 } 488#endif 489 thread_lock(curthread); 490 sched_prio(curthread, PUSER); 491 if (sc->sc_cpubind) 492 sched_bind(curthread, wr->w_number % mp_ncpus); 493 thread_unlock(curthread); 494 495 G_ELI_DEBUG(1, "Thread %s started.", curthread->td_proc->p_comm); 496 497 for (;;) { 498 mtx_lock(&sc->sc_queue_mtx); 499again: 500 bp = g_eli_takefirst(sc); 501 if (bp == NULL) { 502 if (sc->sc_flags & G_ELI_FLAG_DESTROY) { 503 g_eli_cancel(sc); 504 LIST_REMOVE(wr, w_next); 505 g_eli_freesession(wr); 506 free(wr, M_ELI); 507 G_ELI_DEBUG(1, "Thread %s exiting.", 508 curthread->td_proc->p_comm); 509 wakeup(&sc->sc_workers); 510 mtx_unlock(&sc->sc_queue_mtx); 511 kproc_exit(0); 512 } 513 while (sc->sc_flags & G_ELI_FLAG_SUSPEND) { 514 if (sc->sc_inflight > 0) { 515 G_ELI_DEBUG(0, "inflight=%d", 516 sc->sc_inflight); 517 /* 518 * We still have inflight BIOs, so 519 * sleep and retry. 520 */ 521 msleep(sc, &sc->sc_queue_mtx, PRIBIO, 522 "geli:inf", hz / 5); 523 goto again; 524 } 525 /* 526 * Suspend requested, mark the worker as 527 * suspended and go to sleep. 528 */ 529 if (wr->w_active) { 530 g_eli_freesession(wr); 531 wr->w_active = FALSE; 532 } 533 wakeup(&sc->sc_workers); 534 msleep(sc, &sc->sc_queue_mtx, PRIBIO, 535 "geli:suspend", 0); 536 if (!wr->w_active && 537 !(sc->sc_flags & G_ELI_FLAG_SUSPEND)) { 538 error = g_eli_newsession(wr); 539 KASSERT(error == 0, 540 ("g_eli_newsession() failed on resume (error=%d)", 541 error)); 542 wr->w_active = TRUE; 543 } 544 goto again; 545 } 546 msleep(sc, &sc->sc_queue_mtx, PDROP, "geli:w", 0); 547 continue; 548 } 549 if (bp->bio_pflags == G_ELI_NEW_BIO) 550 atomic_add_int(&sc->sc_inflight, 1); 551 mtx_unlock(&sc->sc_queue_mtx); 552 if (bp->bio_pflags == G_ELI_NEW_BIO) { 553 bp->bio_pflags = 0; 554 if (sc->sc_flags & G_ELI_FLAG_AUTH) { 555 if (bp->bio_cmd == BIO_READ) 556 g_eli_auth_read(sc, bp); 557 else 558 g_eli_auth_run(wr, bp); 559 } else { 560 if (bp->bio_cmd == BIO_READ) 561 g_eli_crypto_read(sc, bp, 1); 562 else 563 g_eli_crypto_run(wr, bp); 564 } 565 } else { 566 if (sc->sc_flags & G_ELI_FLAG_AUTH) 567 g_eli_auth_run(wr, bp); 568 else 569 g_eli_crypto_run(wr, bp); 570 } 571 } 572} 573 574/* 575 * Here we generate IV. It is unique for every sector. 576 */ 577void 578g_eli_crypto_ivgen(struct g_eli_softc *sc, off_t offset, u_char *iv, 579 size_t size) 580{ 581 uint8_t off[8]; 582 583 if ((sc->sc_flags & G_ELI_FLAG_NATIVE_BYTE_ORDER) != 0) 584 bcopy(&offset, off, sizeof(off)); 585 else 586 le64enc(off, (uint64_t)offset); 587 588 switch (sc->sc_ealgo) { 589 case CRYPTO_AES_XTS: 590 bcopy(off, iv, sizeof(off)); 591 bzero(iv + sizeof(off), size - sizeof(off)); 592 break; 593 default: 594 { 595 u_char hash[SHA256_DIGEST_LENGTH]; 596 SHA256_CTX ctx; 597 598 /* Copy precalculated SHA256 context for IV-Key. */ 599 bcopy(&sc->sc_ivctx, &ctx, sizeof(ctx)); 600 SHA256_Update(&ctx, off, sizeof(off)); 601 SHA256_Final(hash, &ctx); 602 bcopy(hash, iv, MIN(sizeof(hash), size)); 603 break; 604 } 605 } 606} 607 608int 609g_eli_read_metadata(struct g_class *mp, struct g_provider *pp, 610 struct g_eli_metadata *md) 611{ 612 struct g_geom *gp; 613 struct g_consumer *cp; 614 u_char *buf = NULL; 615 int error; 616 617 g_topology_assert(); 618 619 gp = g_new_geomf(mp, "eli:taste"); 620 gp->start = g_eli_start; 621 gp->access = g_std_access; 622 /* 623 * g_eli_read_metadata() is always called from the event thread. 624 * Our geom is created and destroyed in the same event, so there 625 * could be no orphan nor spoil event in the meantime. 626 */ 627 gp->orphan = g_eli_orphan_spoil_assert; 628 gp->spoiled = g_eli_orphan_spoil_assert; 629 cp = g_new_consumer(gp); 630 error = g_attach(cp, pp); 631 if (error != 0) 632 goto end; 633 error = g_access(cp, 1, 0, 0); 634 if (error != 0) 635 goto end; 636 g_topology_unlock(); 637 buf = g_read_data(cp, pp->mediasize - pp->sectorsize, pp->sectorsize, 638 &error); 639 g_topology_lock(); 640 if (buf == NULL) 641 goto end; 642 eli_metadata_decode(buf, md); 643end: 644 if (buf != NULL) 645 g_free(buf); 646 if (cp->provider != NULL) { 647 if (cp->acr == 1) 648 g_access(cp, -1, 0, 0); 649 g_detach(cp); 650 } 651 g_destroy_consumer(cp); 652 g_destroy_geom(gp); 653 return (error); 654} 655 656/* 657 * The function is called when we had last close on provider and user requested 658 * to close it when this situation occur. 659 */ 660static void 661g_eli_last_close(void *arg, int flags __unused) 662{ 663 struct g_geom *gp; 664 char gpname[64]; 665 int error; 666 667 g_topology_assert(); 668 gp = arg; 669 strlcpy(gpname, gp->name, sizeof(gpname)); 670 error = g_eli_destroy(gp->softc, TRUE); 671 KASSERT(error == 0, ("Cannot detach %s on last close (error=%d).", 672 gpname, error)); 673 G_ELI_DEBUG(0, "Detached %s on last close.", gpname); 674} 675 676int 677g_eli_access(struct g_provider *pp, int dr, int dw, int de) 678{ 679 struct g_eli_softc *sc; 680 struct g_geom *gp; 681 682 gp = pp->geom; 683 sc = gp->softc; 684 685 if (dw > 0) { 686 if (sc->sc_flags & G_ELI_FLAG_RO) { 687 /* Deny write attempts. */ 688 return (EROFS); 689 } 690 /* Someone is opening us for write, we need to remember that. */ 691 sc->sc_flags |= G_ELI_FLAG_WOPEN; 692 return (0); 693 } 694 /* Is this the last close? */ 695 if (pp->acr + dr > 0 || pp->acw + dw > 0 || pp->ace + de > 0) 696 return (0); 697 698 /* 699 * Automatically detach on last close if requested. 700 */ 701 if ((sc->sc_flags & G_ELI_FLAG_RW_DETACH) || 702 (sc->sc_flags & G_ELI_FLAG_WOPEN)) { 703 g_post_event(g_eli_last_close, gp, M_WAITOK, NULL); 704 } 705 return (0); 706} 707 708static int 709g_eli_cpu_is_disabled(int cpu) 710{ 711#ifdef SMP 712 return (CPU_ISSET(cpu, &hlt_cpus_mask)); 713#else 714 return (0); 715#endif 716} 717 718struct g_geom * 719g_eli_create(struct gctl_req *req, struct g_class *mp, struct g_provider *bpp, 720 const struct g_eli_metadata *md, const u_char *mkey, int nkey) 721{ 722 struct g_eli_softc *sc; 723 struct g_eli_worker *wr; 724 struct g_geom *gp; 725 struct g_provider *pp; 726 struct g_consumer *cp; 727 u_int i, threads; 728 int error; 729 730 G_ELI_DEBUG(1, "Creating device %s%s.", bpp->name, G_ELI_SUFFIX); 731 732 gp = g_new_geomf(mp, "%s%s", bpp->name, G_ELI_SUFFIX); 733 sc = malloc(sizeof(*sc), M_ELI, M_WAITOK | M_ZERO); 734 gp->start = g_eli_start; 735 /* 736 * Spoiling cannot happen actually, because we keep provider open for 737 * writing all the time or provider is read-only. 738 */ 739 gp->spoiled = g_eli_orphan_spoil_assert; 740 gp->orphan = g_eli_orphan; 741 gp->dumpconf = g_eli_dumpconf; 742 /* 743 * If detach-on-last-close feature is not enabled and we don't operate 744 * on read-only provider, we can simply use g_std_access(). 745 */ 746 if (md->md_flags & (G_ELI_FLAG_WO_DETACH | G_ELI_FLAG_RO)) 747 gp->access = g_eli_access; 748 else 749 gp->access = g_std_access; 750 751 sc->sc_version = md->md_version; 752 sc->sc_inflight = 0; 753 sc->sc_crypto = G_ELI_CRYPTO_UNKNOWN; 754 sc->sc_flags = md->md_flags; 755 /* Backward compatibility. */ 756 if (md->md_version < G_ELI_VERSION_04) 757 sc->sc_flags |= G_ELI_FLAG_NATIVE_BYTE_ORDER; 758 if (md->md_version < G_ELI_VERSION_05) 759 sc->sc_flags |= G_ELI_FLAG_SINGLE_KEY; 760 if (md->md_version < G_ELI_VERSION_06 && 761 (sc->sc_flags & G_ELI_FLAG_AUTH) != 0) { 762 sc->sc_flags |= G_ELI_FLAG_FIRST_KEY; 763 } 764 if (md->md_version < G_ELI_VERSION_07) 765 sc->sc_flags |= G_ELI_FLAG_ENC_IVKEY; 766 sc->sc_ealgo = md->md_ealgo; 767 sc->sc_nkey = nkey; 768 769 if (sc->sc_flags & G_ELI_FLAG_AUTH) { 770 sc->sc_akeylen = sizeof(sc->sc_akey) * 8; 771 sc->sc_aalgo = md->md_aalgo; 772 sc->sc_alen = g_eli_hashlen(sc->sc_aalgo); 773 774 sc->sc_data_per_sector = bpp->sectorsize - sc->sc_alen; 775 /* 776 * Some hash functions (like SHA1 and RIPEMD160) generates hash 777 * which length is not multiple of 128 bits, but we want data 778 * length to be multiple of 128, so we can encrypt without 779 * padding. The line below rounds down data length to multiple 780 * of 128 bits. 781 */ 782 sc->sc_data_per_sector -= sc->sc_data_per_sector % 16; 783 784 sc->sc_bytes_per_sector = 785 (md->md_sectorsize - 1) / sc->sc_data_per_sector + 1; 786 sc->sc_bytes_per_sector *= bpp->sectorsize; 787 } 788 789 gp->softc = sc; 790 sc->sc_geom = gp; 791 792 bioq_init(&sc->sc_queue); 793 mtx_init(&sc->sc_queue_mtx, "geli:queue", NULL, MTX_DEF); 794 mtx_init(&sc->sc_ekeys_lock, "geli:ekeys", NULL, MTX_DEF); 795 796 pp = NULL; 797 cp = g_new_consumer(gp); 798 error = g_attach(cp, bpp); 799 if (error != 0) { 800 if (req != NULL) { 801 gctl_error(req, "Cannot attach to %s (error=%d).", 802 bpp->name, error); 803 } else { 804 G_ELI_DEBUG(1, "Cannot attach to %s (error=%d).", 805 bpp->name, error); 806 } 807 goto failed; 808 } 809 /* 810 * Keep provider open all the time, so we can run critical tasks, 811 * like Master Keys deletion, without wondering if we can open 812 * provider or not. 813 * We don't open provider for writing only when user requested read-only 814 * access. 815 */ 816 if (sc->sc_flags & G_ELI_FLAG_RO) 817 error = g_access(cp, 1, 0, 1); 818 else 819 error = g_access(cp, 1, 1, 1); 820 if (error != 0) { 821 if (req != NULL) { 822 gctl_error(req, "Cannot access %s (error=%d).", 823 bpp->name, error); 824 } else { 825 G_ELI_DEBUG(1, "Cannot access %s (error=%d).", 826 bpp->name, error); 827 } 828 goto failed; 829 } 830 831 sc->sc_sectorsize = md->md_sectorsize; 832 sc->sc_mediasize = bpp->mediasize; 833 if (!(sc->sc_flags & G_ELI_FLAG_ONETIME)) 834 sc->sc_mediasize -= bpp->sectorsize; 835 if (!(sc->sc_flags & G_ELI_FLAG_AUTH)) 836 sc->sc_mediasize -= (sc->sc_mediasize % sc->sc_sectorsize); 837 else { 838 sc->sc_mediasize /= sc->sc_bytes_per_sector; 839 sc->sc_mediasize *= sc->sc_sectorsize; 840 } 841 842 /* 843 * Remember the keys in our softc structure. 844 */ 845 g_eli_mkey_propagate(sc, mkey); 846 sc->sc_ekeylen = md->md_keylen; 847 848 LIST_INIT(&sc->sc_workers); 849 850 threads = g_eli_threads; 851 if (threads == 0) 852 threads = mp_ncpus; 853 sc->sc_cpubind = (mp_ncpus > 1 && threads == mp_ncpus); 854 for (i = 0; i < threads; i++) { 855 if (g_eli_cpu_is_disabled(i)) { 856 G_ELI_DEBUG(1, "%s: CPU %u disabled, skipping.", 857 bpp->name, i); 858 continue; 859 } 860 wr = malloc(sizeof(*wr), M_ELI, M_WAITOK | M_ZERO); 861 wr->w_softc = sc; 862 wr->w_number = i; 863 wr->w_active = TRUE; 864 865 error = g_eli_newsession(wr); 866 if (error != 0) { 867 free(wr, M_ELI); 868 if (req != NULL) { 869 gctl_error(req, "Cannot set up crypto session " 870 "for %s (error=%d).", bpp->name, error); 871 } else { 872 G_ELI_DEBUG(1, "Cannot set up crypto session " 873 "for %s (error=%d).", bpp->name, error); 874 } 875 goto failed; 876 } 877 878 error = kproc_create(g_eli_worker, wr, &wr->w_proc, 0, 0, 879 "g_eli[%u] %s", i, bpp->name); 880 if (error != 0) { 881 g_eli_freesession(wr); 882 free(wr, M_ELI); 883 if (req != NULL) { 884 gctl_error(req, "Cannot create kernel thread " 885 "for %s (error=%d).", bpp->name, error); 886 } else { 887 G_ELI_DEBUG(1, "Cannot create kernel thread " 888 "for %s (error=%d).", bpp->name, error); 889 } 890 goto failed; 891 } 892 LIST_INSERT_HEAD(&sc->sc_workers, wr, w_next); 893 } 894 895 /* 896 * Create decrypted provider. 897 */ 898 pp = g_new_providerf(gp, "%s%s", bpp->name, G_ELI_SUFFIX); 899 pp->mediasize = sc->sc_mediasize; 900 pp->sectorsize = sc->sc_sectorsize; 901 902 g_error_provider(pp, 0); 903 904 G_ELI_DEBUG(0, "Device %s created.", pp->name); 905 G_ELI_DEBUG(0, "Encryption: %s %u", g_eli_algo2str(sc->sc_ealgo), 906 sc->sc_ekeylen); 907 if (sc->sc_flags & G_ELI_FLAG_AUTH) 908 G_ELI_DEBUG(0, " Integrity: %s", g_eli_algo2str(sc->sc_aalgo)); 909 G_ELI_DEBUG(0, " Crypto: %s", 910 sc->sc_crypto == G_ELI_CRYPTO_SW ? "software" : "hardware"); 911 return (gp); 912failed: 913 mtx_lock(&sc->sc_queue_mtx); 914 sc->sc_flags |= G_ELI_FLAG_DESTROY; 915 wakeup(sc); 916 /* 917 * Wait for kernel threads self destruction. 918 */ 919 while (!LIST_EMPTY(&sc->sc_workers)) { 920 msleep(&sc->sc_workers, &sc->sc_queue_mtx, PRIBIO, 921 "geli:destroy", 0); 922 } 923 mtx_destroy(&sc->sc_queue_mtx); 924 if (cp->provider != NULL) { 925 if (cp->acr == 1) 926 g_access(cp, -1, -1, -1); 927 g_detach(cp); 928 } 929 g_destroy_consumer(cp); 930 g_destroy_geom(gp); 931 g_eli_key_destroy(sc); 932 bzero(sc, sizeof(*sc)); 933 free(sc, M_ELI); 934 return (NULL); 935} 936 937int 938g_eli_destroy(struct g_eli_softc *sc, boolean_t force) 939{ 940 struct g_geom *gp; 941 struct g_provider *pp; 942 943 g_topology_assert(); 944 945 if (sc == NULL) 946 return (ENXIO); 947 948 gp = sc->sc_geom; 949 pp = LIST_FIRST(&gp->provider); 950 if (pp != NULL && (pp->acr != 0 || pp->acw != 0 || pp->ace != 0)) { 951 if (force) { 952 G_ELI_DEBUG(1, "Device %s is still open, so it " 953 "cannot be definitely removed.", pp->name); 954 sc->sc_flags |= G_ELI_FLAG_RW_DETACH; 955 gp->access = g_eli_access; 956 g_wither_provider(pp, ENXIO); 957 return (EBUSY); 958 } else { 959 G_ELI_DEBUG(1, 960 "Device %s is still open (r%dw%de%d).", pp->name, 961 pp->acr, pp->acw, pp->ace); 962 return (EBUSY); 963 } 964 } 965 966 mtx_lock(&sc->sc_queue_mtx); 967 sc->sc_flags |= G_ELI_FLAG_DESTROY; 968 wakeup(sc); 969 while (!LIST_EMPTY(&sc->sc_workers)) { 970 msleep(&sc->sc_workers, &sc->sc_queue_mtx, PRIBIO, 971 "geli:destroy", 0); 972 } 973 mtx_destroy(&sc->sc_queue_mtx); 974 gp->softc = NULL; 975 g_eli_key_destroy(sc); 976 bzero(sc, sizeof(*sc)); 977 free(sc, M_ELI); 978 979 if (pp == NULL || (pp->acr == 0 && pp->acw == 0 && pp->ace == 0)) 980 G_ELI_DEBUG(0, "Device %s destroyed.", gp->name); 981 g_wither_geom_close(gp, ENXIO); 982 983 return (0); 984} 985 986static int 987g_eli_destroy_geom(struct gctl_req *req __unused, 988 struct g_class *mp __unused, struct g_geom *gp) 989{ 990 struct g_eli_softc *sc; 991 992 sc = gp->softc; 993 return (g_eli_destroy(sc, FALSE)); 994} 995 996static int 997g_eli_keyfiles_load(struct hmac_ctx *ctx, const char *provider) 998{ 999 u_char *keyfile, *data; 1000 char *file, name[64]; 1001 size_t size; 1002 int i; 1003 1004 for (i = 0; ; i++) { 1005 snprintf(name, sizeof(name), "%s:geli_keyfile%d", provider, i); 1006 keyfile = preload_search_by_type(name); 1007 if (keyfile == NULL) 1008 return (i); /* Return number of loaded keyfiles. */ 1009 data = preload_fetch_addr(keyfile); 1010 if (data == NULL) { 1011 G_ELI_DEBUG(0, "Cannot find key file data for %s.", 1012 name); 1013 return (0); 1014 } 1015 size = preload_fetch_size(keyfile); 1016 if (size == 0) { 1017 G_ELI_DEBUG(0, "Cannot find key file size for %s.", 1018 name); 1019 return (0); 1020 } 1021 file = preload_search_info(keyfile, MODINFO_NAME); 1022 if (file == NULL) { 1023 G_ELI_DEBUG(0, "Cannot find key file name for %s.", 1024 name); 1025 return (0); 1026 } 1027 G_ELI_DEBUG(1, "Loaded keyfile %s for %s (type: %s).", file, 1028 provider, name); 1029 g_eli_crypto_hmac_update(ctx, data, size); 1030 } 1031} 1032 1033static void 1034g_eli_keyfiles_clear(const char *provider) 1035{ 1036 u_char *keyfile, *data; 1037 char name[64]; 1038 size_t size; 1039 int i; 1040 1041 for (i = 0; ; i++) { 1042 snprintf(name, sizeof(name), "%s:geli_keyfile%d", provider, i); 1043 keyfile = preload_search_by_type(name); 1044 if (keyfile == NULL) 1045 return; 1046 data = preload_fetch_addr(keyfile); 1047 size = preload_fetch_size(keyfile); 1048 if (data != NULL && size != 0) 1049 bzero(data, size); 1050 } 1051} 1052 1053/* 1054 * Tasting is only made on boot. 1055 * We detect providers which should be attached before root is mounted. 1056 */ 1057static struct g_geom * 1058g_eli_taste(struct g_class *mp, struct g_provider *pp, int flags __unused) 1059{ 1060 struct g_eli_metadata md; 1061 struct g_geom *gp; 1062 struct hmac_ctx ctx; 1063 char passphrase[256]; 1064 u_char key[G_ELI_USERKEYLEN], mkey[G_ELI_DATAIVKEYLEN]; 1065 u_int i, nkey, nkeyfiles, tries; 1066 int error; 1067 1068 g_trace(G_T_TOPOLOGY, "%s(%s, %s)", __func__, mp->name, pp->name); 1069 g_topology_assert(); 1070 1071 if (root_mounted() || g_eli_tries == 0) 1072 return (NULL); 1073 1074 G_ELI_DEBUG(3, "Tasting %s.", pp->name); 1075 1076 error = g_eli_read_metadata(mp, pp, &md); 1077 if (error != 0) 1078 return (NULL); 1079 gp = NULL; 1080 1081 if (strcmp(md.md_magic, G_ELI_MAGIC) != 0) 1082 return (NULL); 1083 if (md.md_version > G_ELI_VERSION) { 1084 printf("geom_eli.ko module is too old to handle %s.\n", 1085 pp->name); 1086 return (NULL); 1087 } 1088 if (md.md_provsize != pp->mediasize) 1089 return (NULL); 1090 /* Should we attach it on boot? */ 1091 if (!(md.md_flags & G_ELI_FLAG_BOOT)) 1092 return (NULL); 1093 if (md.md_keys == 0x00) { 1094 G_ELI_DEBUG(0, "No valid keys on %s.", pp->name); 1095 return (NULL); 1096 } 1097 if (md.md_iterations == -1) { 1098 /* If there is no passphrase, we try only once. */ 1099 tries = 1; 1100 } else { 1101 /* Ask for the passphrase no more than g_eli_tries times. */ 1102 tries = g_eli_tries; 1103 } 1104 1105 for (i = 0; i <= tries; i++) { 1106 g_eli_crypto_hmac_init(&ctx, NULL, 0); 1107 1108 /* 1109 * Load all key files. 1110 */ 1111 nkeyfiles = g_eli_keyfiles_load(&ctx, pp->name); 1112 1113 if (nkeyfiles == 0 && md.md_iterations == -1) { 1114 /* 1115 * No key files and no passphrase, something is 1116 * definitely wrong here. 1117 * geli(8) doesn't allow for such situation, so assume 1118 * that there was really no passphrase and in that case 1119 * key files are no properly defined in loader.conf. 1120 */ 1121 G_ELI_DEBUG(0, 1122 "Found no key files in loader.conf for %s.", 1123 pp->name); 1124 return (NULL); 1125 } 1126 1127 /* Ask for the passphrase if defined. */ 1128 if (md.md_iterations >= 0) { 1129 /* Try first with cached passphrase. */ 1130 if (i == 0) { 1131 if (!g_eli_boot_passcache) 1132 continue; 1133 memcpy(passphrase, cached_passphrase, 1134 sizeof(passphrase)); 1135 } else { 1136 printf("Enter passphrase for %s: ", pp->name); 1137 cngets(passphrase, sizeof(passphrase), 1138 g_eli_visible_passphrase); 1139 memcpy(cached_passphrase, passphrase, 1140 sizeof(passphrase)); 1141 } 1142 } 1143 1144 /* 1145 * Prepare Derived-Key from the user passphrase. 1146 */ 1147 if (md.md_iterations == 0) { 1148 g_eli_crypto_hmac_update(&ctx, md.md_salt, 1149 sizeof(md.md_salt)); 1150 g_eli_crypto_hmac_update(&ctx, passphrase, 1151 strlen(passphrase)); 1152 bzero(passphrase, sizeof(passphrase)); 1153 } else if (md.md_iterations > 0) { 1154 u_char dkey[G_ELI_USERKEYLEN]; 1155 1156 pkcs5v2_genkey(dkey, sizeof(dkey), md.md_salt, 1157 sizeof(md.md_salt), passphrase, md.md_iterations); 1158 bzero(passphrase, sizeof(passphrase)); 1159 g_eli_crypto_hmac_update(&ctx, dkey, sizeof(dkey)); 1160 bzero(dkey, sizeof(dkey)); 1161 } 1162 1163 g_eli_crypto_hmac_final(&ctx, key, 0); 1164 1165 /* 1166 * Decrypt Master-Key. 1167 */ 1168 error = g_eli_mkey_decrypt(&md, key, mkey, &nkey); 1169 bzero(key, sizeof(key)); 1170 if (error == -1) { 1171 if (i == tries) { 1172 G_ELI_DEBUG(0, 1173 "Wrong key for %s. No tries left.", 1174 pp->name); 1175 g_eli_keyfiles_clear(pp->name); 1176 return (NULL); 1177 } 1178 if (i > 0) { 1179 G_ELI_DEBUG(0, 1180 "Wrong key for %s. Tries left: %u.", 1181 pp->name, tries - i); 1182 } 1183 /* Try again. */ 1184 continue; 1185 } else if (error > 0) { 1186 G_ELI_DEBUG(0, 1187 "Cannot decrypt Master Key for %s (error=%d).", 1188 pp->name, error); 1189 g_eli_keyfiles_clear(pp->name); 1190 return (NULL); 1191 } 1192 g_eli_keyfiles_clear(pp->name); 1193 G_ELI_DEBUG(1, "Using Master Key %u for %s.", nkey, pp->name); 1194 break; 1195 } 1196 1197 /* 1198 * We have correct key, let's attach provider. 1199 */ 1200 gp = g_eli_create(NULL, mp, pp, &md, mkey, nkey); 1201 bzero(mkey, sizeof(mkey)); 1202 bzero(&md, sizeof(md)); 1203 if (gp == NULL) { 1204 G_ELI_DEBUG(0, "Cannot create device %s%s.", pp->name, 1205 G_ELI_SUFFIX); 1206 return (NULL); 1207 } 1208 return (gp); 1209} 1210 1211static void 1212g_eli_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, 1213 struct g_consumer *cp, struct g_provider *pp) 1214{ 1215 struct g_eli_softc *sc; 1216 1217 g_topology_assert(); 1218 sc = gp->softc; 1219 if (sc == NULL) 1220 return; 1221 if (pp != NULL || cp != NULL) 1222 return; /* Nothing here. */ 1223 1224 sbuf_printf(sb, "%s<KeysTotal>%ju</KeysTotal>\n", indent, 1225 (uintmax_t)sc->sc_ekeys_total); 1226 sbuf_printf(sb, "%s<KeysAllocated>%ju</KeysAllocated>\n", indent, 1227 (uintmax_t)sc->sc_ekeys_allocated); 1228 sbuf_printf(sb, "%s<Flags>", indent); 1229 if (sc->sc_flags == 0) 1230 sbuf_printf(sb, "NONE"); 1231 else { 1232 int first = 1; 1233 1234#define ADD_FLAG(flag, name) do { \ 1235 if (sc->sc_flags & (flag)) { \ 1236 if (!first) \ 1237 sbuf_printf(sb, ", "); \ 1238 else \ 1239 first = 0; \ 1240 sbuf_printf(sb, name); \ 1241 } \ 1242} while (0) 1243 ADD_FLAG(G_ELI_FLAG_SUSPEND, "SUSPEND"); 1244 ADD_FLAG(G_ELI_FLAG_SINGLE_KEY, "SINGLE-KEY"); 1245 ADD_FLAG(G_ELI_FLAG_NATIVE_BYTE_ORDER, "NATIVE-BYTE-ORDER"); 1246 ADD_FLAG(G_ELI_FLAG_ONETIME, "ONETIME"); 1247 ADD_FLAG(G_ELI_FLAG_BOOT, "BOOT"); 1248 ADD_FLAG(G_ELI_FLAG_WO_DETACH, "W-DETACH"); 1249 ADD_FLAG(G_ELI_FLAG_RW_DETACH, "RW-DETACH"); 1250 ADD_FLAG(G_ELI_FLAG_AUTH, "AUTH"); 1251 ADD_FLAG(G_ELI_FLAG_WOPEN, "W-OPEN"); 1252 ADD_FLAG(G_ELI_FLAG_DESTROY, "DESTROY"); 1253 ADD_FLAG(G_ELI_FLAG_RO, "READ-ONLY"); 1254#undef ADD_FLAG 1255 } 1256 sbuf_printf(sb, "</Flags>\n"); 1257 1258 if (!(sc->sc_flags & G_ELI_FLAG_ONETIME)) { 1259 sbuf_printf(sb, "%s<UsedKey>%u</UsedKey>\n", indent, 1260 sc->sc_nkey); 1261 } 1262 sbuf_printf(sb, "%s<Version>%u</Version>\n", indent, sc->sc_version); 1263 sbuf_printf(sb, "%s<Crypto>", indent); 1264 switch (sc->sc_crypto) { 1265 case G_ELI_CRYPTO_HW: 1266 sbuf_printf(sb, "hardware"); 1267 break; 1268 case G_ELI_CRYPTO_SW: 1269 sbuf_printf(sb, "software"); 1270 break; 1271 default: 1272 sbuf_printf(sb, "UNKNOWN"); 1273 break; 1274 } 1275 sbuf_printf(sb, "</Crypto>\n"); 1276 if (sc->sc_flags & G_ELI_FLAG_AUTH) { 1277 sbuf_printf(sb, 1278 "%s<AuthenticationAlgorithm>%s</AuthenticationAlgorithm>\n", 1279 indent, g_eli_algo2str(sc->sc_aalgo)); 1280 } 1281 sbuf_printf(sb, "%s<KeyLength>%u</KeyLength>\n", indent, 1282 sc->sc_ekeylen); 1283 sbuf_printf(sb, "%s<EncryptionAlgorithm>%s</EncryptionAlgorithm>\n", 1284 indent, g_eli_algo2str(sc->sc_ealgo)); 1285 sbuf_printf(sb, "%s<State>%s</State>\n", indent, 1286 (sc->sc_flags & G_ELI_FLAG_SUSPEND) ? "SUSPENDED" : "ACTIVE"); 1287} 1288 1289static void 1290g_eli_shutdown_pre_sync(void *arg, int howto) 1291{ 1292 struct g_class *mp; 1293 struct g_geom *gp, *gp2; 1294 struct g_provider *pp; 1295 struct g_eli_softc *sc; 1296 int error; 1297 1298 mp = arg; 1299 DROP_GIANT(); 1300 g_topology_lock(); 1301 LIST_FOREACH_SAFE(gp, &mp->geom, geom, gp2) { 1302 sc = gp->softc; 1303 if (sc == NULL) 1304 continue; 1305 pp = LIST_FIRST(&gp->provider); 1306 KASSERT(pp != NULL, ("No provider? gp=%p (%s)", gp, gp->name)); 1307 if (pp->acr + pp->acw + pp->ace == 0) 1308 error = g_eli_destroy(sc, TRUE); 1309 else { 1310 sc->sc_flags |= G_ELI_FLAG_RW_DETACH; 1311 gp->access = g_eli_access; 1312 } 1313 } 1314 g_topology_unlock(); 1315 PICKUP_GIANT(); 1316} 1317 1318static void 1319g_eli_init(struct g_class *mp) 1320{ 1321 1322 g_eli_pre_sync = EVENTHANDLER_REGISTER(shutdown_pre_sync, 1323 g_eli_shutdown_pre_sync, mp, SHUTDOWN_PRI_FIRST); 1324 if (g_eli_pre_sync == NULL) 1325 G_ELI_DEBUG(0, "Warning! Cannot register shutdown event."); 1326} 1327 1328static void 1329g_eli_fini(struct g_class *mp) 1330{ 1331 1332 if (g_eli_pre_sync != NULL) 1333 EVENTHANDLER_DEREGISTER(shutdown_pre_sync, g_eli_pre_sync); 1334} 1335 1336DECLARE_GEOM_CLASS(g_eli_class, g_eli); 1337MODULE_DEPEND(g_eli, crypto, 1, 1, 1); 1338