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