sys/geom/eli/g_eli.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
   3  *
   4  * Copyright (c) 2005-2019 Pawel Jakub Dawidek <pawel@dawidek.net>
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
  17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
  20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  */
  28
  29 #include <sys/cdefs.h>
  30 __FBSDID("$FreeBSD$");
  31
  32 #include <sys/param.h>
  33 #include <sys/systm.h>
  34 #include <sys/cons.h>
  35 #include <sys/kenv.h>
  36 #include <sys/kernel.h>
  37 #include <sys/linker.h>
  38 #include <sys/module.h>
  39 #include <sys/lock.h>
  40 #include <sys/mutex.h>
  41 #include <sys/bio.h>
  42 #include <sys/sbuf.h>
  43 #include <sys/sysctl.h>
  44 #include <sys/malloc.h>
  45 #include <sys/eventhandler.h>
  46 #include <sys/kthread.h>
  47 #include <sys/proc.h>
  48 #include <sys/sched.h>
  49 #include <sys/smp.h>
  50 #include <sys/uio.h>
  51 #include <sys/vnode.h>
  52
  53 #include <machine/vmparam.h>
  54
  55 #include <vm/uma.h>
  56 #include <vm/vm.h>
  57 #include <vm/swap_pager.h>
  58
  59 #include <geom/geom.h>
  60 #include <geom/geom_dbg.h>
  61 #include <geom/eli/g_eli.h>
  62 #include <geom/eli/pkcs5v2.h>
  63
  64 #include <crypto/intake.h>
  65
  66 FEATURE(geom_eli, "GEOM crypto module");
  67
  68 MALLOC_DEFINE(M_ELI, "eli_data", "GEOM_ELI Data");
  69
  70 SYSCTL_DECL(_kern_geom);
  71 SYSCTL_NODE(_kern_geom, OID_AUTO, eli, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
  72     "GEOM_ELI stuff");
  73 static int g_eli_version = G_ELI_VERSION;
  74 SYSCTL_INT(_kern_geom_eli, OID_AUTO, version, CTLFLAG_RD, &g_eli_version, 0,
  75     "GELI version");
  76 int g_eli_debug = 0;
  77 SYSCTL_INT(_kern_geom_eli, OID_AUTO, debug, CTLFLAG_RWTUN, &g_eli_debug, 0,
  78     "Debug level");
  79 static u_int g_eli_tries = 3;
  80 SYSCTL_UINT(_kern_geom_eli, OID_AUTO, tries, CTLFLAG_RWTUN, &g_eli_tries, 0,
  81     "Number of tries for entering the passphrase");
  82 static u_int g_eli_visible_passphrase = GETS_NOECHO;
  83 SYSCTL_UINT(_kern_geom_eli, OID_AUTO, visible_passphrase, CTLFLAG_RWTUN,
  84     &g_eli_visible_passphrase, 0,
  85     "Visibility of passphrase prompt (0 = invisible, 1 = visible, 2 = asterisk)");
  86 u_int g_eli_overwrites = G_ELI_OVERWRITES;
  87 SYSCTL_UINT(_kern_geom_eli, OID_AUTO, overwrites, CTLFLAG_RWTUN, &g_eli_overwrites,
  88     0, "Number of times on-disk keys should be overwritten when destroying them");
  89 static u_int g_eli_threads = 0;
  90 SYSCTL_UINT(_kern_geom_eli, OID_AUTO, threads, CTLFLAG_RWTUN, &g_eli_threads, 0,
  91     "Number of threads doing crypto work");
  92 u_int g_eli_batch = 0;
  93 SYSCTL_UINT(_kern_geom_eli, OID_AUTO, batch, CTLFLAG_RWTUN, &g_eli_batch, 0,
  94     "Use crypto operations batching");
  95 static u_int g_eli_minbufs = 16;
  96 static int sysctl_g_eli_minbufs(SYSCTL_HANDLER_ARGS);
  97 SYSCTL_PROC(_kern_geom_eli, OID_AUTO, minbufs, CTLTYPE_UINT | CTLFLAG_RW |
  98     CTLFLAG_MPSAFE, NULL, 0, sysctl_g_eli_minbufs, "IU",
  99     "Number of GELI bufs reserved for swap transactions");
 100 static bool g_eli_blocking_malloc = false;
 101 SYSCTL_BOOL(_kern_geom_eli, OID_AUTO, blocking_malloc, CTLFLAG_RWTUN,
 102     &g_eli_blocking_malloc, 0, "Use blocking malloc calls for GELI buffers");
 103 static bool g_eli_unmapped_io = true;
 104 SYSCTL_BOOL(_kern_geom_eli, OID_AUTO, unmapped_io, CTLFLAG_RDTUN,
 105     &g_eli_unmapped_io, 0, "Enable support for unmapped I/O");
 106
 107 static struct sx g_eli_umalock; /* Controls changes to UMA zone. */
 108 SX_SYSINIT(g_eli_umalock, &g_eli_umalock, "GELI UMA");
 109 static uma_zone_t g_eli_uma = NULL;
 110 static int g_eli_alloc_sz;
 111 static volatile int g_eli_umaoutstanding;
 112 static volatile int g_eli_devs;
 113
 114 /*
 115  * Control the number of reserved entries in the GELI zone.
 116  * If the GELI zone has already been allocated, update the zone. Otherwise,
 117  * simply update the variable for use the next time the zone is created.
 118  */
 119 static int
 120 sysctl_g_eli_minbufs(SYSCTL_HANDLER_ARGS)
 121 {
 122         int error;
 123         u_int new;
 124
 125         new = g_eli_minbufs;
 126         error = sysctl_handle_int(oidp, &new, 0, req);
 127         if (error != 0 || req->newptr == NULL)
 128                 return (error);
 129         sx_xlock(&g_eli_umalock);
 130         if (g_eli_uma != NULL) {
 131                 if (new != g_eli_minbufs)
 132                         uma_zone_reserve(g_eli_uma, new);
 133                 if (new > g_eli_minbufs)
 134                         uma_prealloc(g_eli_uma, new - g_eli_minbufs);
 135         }
 136         if (new != g_eli_minbufs)
 137                 g_eli_minbufs = new;
 138         sx_xunlock(&g_eli_umalock);
 139         return (0);
 140 }
 141
 142 /*
 143  * Passphrase cached during boot, in order to be more user-friendly if
 144  * there are multiple providers using the same passphrase.
 145  */
 146 static char cached_passphrase[256];
 147 static u_int g_eli_boot_passcache = 1;
 148 TUNABLE_INT("kern.geom.eli.boot_passcache", &g_eli_boot_passcache);
 149 SYSCTL_UINT(_kern_geom_eli, OID_AUTO, boot_passcache, CTLFLAG_RD,
 150     &g_eli_boot_passcache, 0,
 151     "Passphrases are cached during boot process for possible reuse");
 152 static void
 153 fetch_loader_passphrase(void * dummy)
 154 {
 155         char * env_passphrase;
 156
 157         KASSERT(dynamic_kenv, ("need dynamic kenv"));
 158
 159         if ((env_passphrase = kern_getenv("kern.geom.eli.passphrase")) != NULL) {
 160                 /* Extract passphrase from the environment. */
 161                 strlcpy(cached_passphrase, env_passphrase,
 162                     sizeof(cached_passphrase));
 163                 freeenv(env_passphrase);
 164
 165                 /* Wipe the passphrase from the environment. */
 166                 kern_unsetenv("kern.geom.eli.passphrase");
 167         }
 168 }
 169 SYSINIT(geli_fetch_loader_passphrase, SI_SUB_KMEM + 1, SI_ORDER_ANY,
 170     fetch_loader_passphrase, NULL);
 171
 172 static void
 173 zero_boot_passcache(void)
 174 {
 175
 176         explicit_bzero(cached_passphrase, sizeof(cached_passphrase));
 177 }
 178
 179 static void
 180 zero_geli_intake_keys(void)
 181 {
 182         struct keybuf *keybuf;
 183         int i;
 184
 185         if ((keybuf = get_keybuf()) != NULL) {
 186                 /* Scan the key buffer, clear all GELI keys. */
 187                 for (i = 0; i < keybuf->kb_nents; i++) {
 188                          if (keybuf->kb_ents[i].ke_type == KEYBUF_TYPE_GELI) {
 189                                  explicit_bzero(keybuf->kb_ents[i].ke_data,
 190                                      sizeof(keybuf->kb_ents[i].ke_data));
 191                                  keybuf->kb_ents[i].ke_type = KEYBUF_TYPE_NONE;
 192                          }
 193                 }
 194         }
 195 }
 196
 197 static void
 198 zero_intake_passcache(void *dummy)
 199 {
 200         zero_boot_passcache();
 201         zero_geli_intake_keys();
 202 }
 203 EVENTHANDLER_DEFINE(mountroot, zero_intake_passcache, NULL, 0);
 204
 205 static eventhandler_tag g_eli_pre_sync = NULL;
 206
 207 static int g_eli_read_metadata_offset(struct g_class *mp, struct g_provider *pp,
 208     off_t offset, struct g_eli_metadata *md);
 209
 210 static int g_eli_destroy_geom(struct gctl_req *req, struct g_class *mp,
 211     struct g_geom *gp);
 212 static void g_eli_init(struct g_class *mp);
 213 static void g_eli_fini(struct g_class *mp);
 214
 215 static g_taste_t g_eli_taste;
 216 static g_dumpconf_t g_eli_dumpconf;
 217
 218 struct g_class g_eli_class = {
 219         .name = G_ELI_CLASS_NAME,
 220         .version = G_VERSION,
 221         .ctlreq = g_eli_config,
 222         .taste = g_eli_taste,
 223         .destroy_geom = g_eli_destroy_geom,
 224         .init = g_eli_init,
 225         .fini = g_eli_fini
 226 };
 227
 228 /*
 229  * Code paths:
 230  * BIO_READ:
 231  *      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
 232  * BIO_WRITE:
 233  *      g_eli_start -> g_eli_crypto_run -> g_eli_crypto_write_done -> g_io_request -> g_eli_write_done -> g_io_deliver
 234  */
 235
 236 /*
 237  * EAGAIN from crypto(9) means, that we were probably balanced to another crypto
 238  * accelerator or something like this.
 239  * The function updates the SID and rerun the operation.
 240  */
 241 int
 242 g_eli_crypto_rerun(struct cryptop *crp)
 243 {
 244         struct g_eli_softc *sc;
 245         struct g_eli_worker *wr;
 246         struct bio *bp;
 247         int error;
 248
 249         bp = (struct bio *)crp->crp_opaque;
 250         sc = bp->bio_to->geom->softc;
 251         LIST_FOREACH(wr, &sc->sc_workers, w_next) {
 252                 if (wr->w_number == G_ELI_WORKER(bp->bio_pflags))
 253                         break;
 254         }
 255         KASSERT(wr != NULL, ("Invalid worker (%u).",
 256             G_ELI_WORKER(bp->bio_pflags)));
 257         G_ELI_DEBUG(1, "Rerunning crypto %s request (sid: %p -> %p).",
 258             bp->bio_cmd == BIO_READ ? "READ" : "WRITE", wr->w_sid,
 259             crp->crp_session);
 260         wr->w_sid = crp->crp_session;
 261         crp->crp_etype = 0;
 262         error = crypto_dispatch(crp);
 263         if (error == 0)
 264                 return (0);
 265         G_ELI_DEBUG(1, "%s: crypto_dispatch() returned %d.", __func__, error);
 266         crp->crp_etype = error;
 267         return (error);
 268 }
 269
 270 static void
 271 g_eli_getattr_done(struct bio *bp)
 272 {
 273         if (bp->bio_error == 0 &&
 274             !strcmp(bp->bio_attribute, "GEOM::physpath")) {
 275                 strlcat(bp->bio_data, "/eli", bp->bio_length);
 276         }
 277         g_std_done(bp);
 278 }
 279
 280 /*
 281  * The function is called afer reading encrypted data from the provider.
 282  *
 283  * 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
 284  */
 285 void
 286 g_eli_read_done(struct bio *bp)
 287 {
 288         struct g_eli_softc *sc;
 289         struct bio *pbp;
 290
 291         G_ELI_LOGREQ(2, bp, "Request done.");
 292         pbp = bp->bio_parent;
 293         if (pbp->bio_error == 0 && bp->bio_error != 0)
 294                 pbp->bio_error = bp->bio_error;
 295         g_destroy_bio(bp);
 296         /*
 297          * Do we have all sectors already?
 298          */
 299         pbp->bio_inbed++;
 300         if (pbp->bio_inbed < pbp->bio_children)
 301                 return;
 302         sc = pbp->bio_to->geom->softc;
 303         if (pbp->bio_error != 0) {
 304                 G_ELI_LOGREQ(0, pbp, "%s() failed (error=%d)", __func__,
 305                     pbp->bio_error);
 306                 pbp->bio_completed = 0;
 307                 g_eli_free_data(pbp);
 308                 g_io_deliver(pbp, pbp->bio_error);
 309                 if (sc != NULL)
 310                         atomic_subtract_int(&sc->sc_inflight, 1);
 311                 return;
 312         }
 313         mtx_lock(&sc->sc_queue_mtx);
 314         bioq_insert_tail(&sc->sc_queue, pbp);
 315         mtx_unlock(&sc->sc_queue_mtx);
 316         wakeup(sc);
 317 }
 318
 319 /*
 320  * The function is called after we encrypt and write data.
 321  *
 322  * g_eli_start -> g_eli_crypto_run -> g_eli_crypto_write_done -> g_io_request -> G_ELI_WRITE_DONE -> g_io_deliver
 323  */
 324 void
 325 g_eli_write_done(struct bio *bp)
 326 {
 327         struct g_eli_softc *sc;
 328         struct bio *pbp;
 329
 330         G_ELI_LOGREQ(2, bp, "Request done.");
 331         pbp = bp->bio_parent;
 332         if (pbp->bio_error == 0 && bp->bio_error != 0)
 333                 pbp->bio_error = bp->bio_error;
 334         g_destroy_bio(bp);
 335         /*
 336          * Do we have all sectors already?
 337          */
 338         pbp->bio_inbed++;
 339         if (pbp->bio_inbed < pbp->bio_children)
 340                 return;
 341         sc = pbp->bio_to->geom->softc;
 342         g_eli_free_data(pbp);
 343         if (pbp->bio_error != 0) {
 344                 G_ELI_LOGREQ(0, pbp, "%s() failed (error=%d)", __func__,
 345                     pbp->bio_error);
 346                 pbp->bio_completed = 0;
 347         } else
 348                 pbp->bio_completed = pbp->bio_length;
 349
 350         /*
 351          * Write is finished, send it up.
 352          */
 353         g_io_deliver(pbp, pbp->bio_error);
 354         if (sc != NULL)
 355                 atomic_subtract_int(&sc->sc_inflight, 1);
 356 }
 357
 358 /*
 359  * This function should never be called, but GEOM made as it set ->orphan()
 360  * method for every geom.
 361  */
 362 static void
 363 g_eli_orphan_spoil_assert(struct g_consumer *cp)
 364 {
 365
 366         panic("Function %s() called for %s.", __func__, cp->geom->name);
 367 }
 368
 369 static void
 370 g_eli_orphan(struct g_consumer *cp)
 371 {
 372         struct g_eli_softc *sc;
 373
 374         g_topology_assert();
 375         sc = cp->geom->softc;
 376         if (sc == NULL)
 377                 return;
 378         g_eli_destroy(sc, TRUE);
 379 }
 380
 381 static void
 382 g_eli_resize(struct g_consumer *cp)
 383 {
 384         struct g_eli_softc *sc;
 385         struct g_provider *epp, *pp;
 386         off_t oldsize;
 387
 388         g_topology_assert();
 389         sc = cp->geom->softc;
 390         if (sc == NULL)
 391                 return;
 392
 393         if ((sc->sc_flags & G_ELI_FLAG_AUTORESIZE) == 0) {
 394                 G_ELI_DEBUG(0, "Autoresize is turned off, old size: %jd.",
 395                     (intmax_t)sc->sc_provsize);
 396                 return;
 397         }
 398
 399         pp = cp->provider;
 400
 401         if ((sc->sc_flags & G_ELI_FLAG_ONETIME) == 0) {
 402                 struct g_eli_metadata md;
 403                 u_char *sector;
 404                 int error;
 405
 406                 sector = NULL;
 407
 408                 error = g_eli_read_metadata_offset(cp->geom->class, pp,
 409                     sc->sc_provsize - pp->sectorsize, &md);
 410                 if (error != 0) {
 411                         G_ELI_DEBUG(0, "Cannot read metadata from %s (error=%d).",
 412                             pp->name, error);
 413                         goto iofail;
 414                 }
 415
 416                 md.md_provsize = pp->mediasize;
 417
 418                 sector = malloc(pp->sectorsize, M_ELI, M_WAITOK | M_ZERO);
 419                 eli_metadata_encode(&md, sector);
 420                 error = g_write_data(cp, pp->mediasize - pp->sectorsize, sector,
 421                     pp->sectorsize);
 422                 if (error != 0) {
 423                         G_ELI_DEBUG(0, "Cannot store metadata on %s (error=%d).",
 424                             pp->name, error);
 425                         goto iofail;
 426                 }
 427                 explicit_bzero(sector, pp->sectorsize);
 428                 error = g_write_data(cp, sc->sc_provsize - pp->sectorsize,
 429                     sector, pp->sectorsize);
 430                 if (error != 0) {
 431                         G_ELI_DEBUG(0, "Cannot clear old metadata from %s (error=%d).",
 432                             pp->name, error);
 433                         goto iofail;
 434                 }
 435 iofail:
 436                 explicit_bzero(&md, sizeof(md));
 437                 zfree(sector, M_ELI);
 438         }
 439
 440         oldsize = sc->sc_mediasize;
 441         sc->sc_mediasize = eli_mediasize(sc, pp->mediasize, pp->sectorsize);
 442         g_eli_key_resize(sc);
 443         sc->sc_provsize = pp->mediasize;
 444
 445         epp = LIST_FIRST(&sc->sc_geom->provider);
 446         g_resize_provider(epp, sc->sc_mediasize);
 447         G_ELI_DEBUG(0, "Device %s size changed from %jd to %jd.", epp->name,
 448             (intmax_t)oldsize, (intmax_t)sc->sc_mediasize);
 449 }
 450
 451 /*
 452  * BIO_READ:
 453  *      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
 454  * BIO_WRITE:
 455  *      G_ELI_START -> g_eli_crypto_run -> g_eli_crypto_write_done -> g_io_request -> g_eli_write_done -> g_io_deliver
 456  */
 457 static void
 458 g_eli_start(struct bio *bp)
 459 {
 460         struct g_eli_softc *sc;
 461         struct g_consumer *cp;
 462         struct bio *cbp;
 463
 464         sc = bp->bio_to->geom->softc;
 465         KASSERT(sc != NULL,
 466             ("Provider's error should be set (error=%d)(device=%s).",
 467             bp->bio_to->error, bp->bio_to->name));
 468         G_ELI_LOGREQ(2, bp, "Request received.");
 469
 470         switch (bp->bio_cmd) {
 471         case BIO_READ:
 472         case BIO_WRITE:
 473         case BIO_GETATTR:
 474         case BIO_FLUSH:
 475         case BIO_ZONE:
 476         case BIO_SPEEDUP:
 477                 break;
 478         case BIO_DELETE:
 479                 /*
 480                  * If the user hasn't set the NODELETE flag, we just pass
 481                  * it down the stack and let the layers beneath us do (or
 482                  * not) whatever they do with it.  If they have, we
 483                  * reject it.  A possible extension would be an
 484                  * additional flag to take it as a hint to shred the data
 485                  * with [multiple?] overwrites.
 486                  */
 487                 if (!(sc->sc_flags & G_ELI_FLAG_NODELETE))
 488                         break;
 489         default:
 490                 g_io_deliver(bp, EOPNOTSUPP);
 491                 return;
 492         }
 493         cbp = g_clone_bio(bp);
 494         if (cbp == NULL) {
 495                 g_io_deliver(bp, ENOMEM);
 496                 return;
 497         }
 498         bp->bio_driver1 = cbp;
 499         bp->bio_pflags = 0;
 500         G_ELI_SET_NEW_BIO(bp->bio_pflags);
 501         switch (bp->bio_cmd) {
 502         case BIO_READ:
 503                 if (!(sc->sc_flags & G_ELI_FLAG_AUTH)) {
 504                         g_eli_crypto_read(sc, bp, 0);
 505                         break;
 506                 }
 507                 /* FALLTHROUGH */
 508         case BIO_WRITE:
 509                 mtx_lock(&sc->sc_queue_mtx);
 510                 bioq_insert_tail(&sc->sc_queue, bp);
 511                 mtx_unlock(&sc->sc_queue_mtx);
 512                 wakeup(sc);
 513                 break;
 514         case BIO_GETATTR:
 515         case BIO_FLUSH:
 516         case BIO_DELETE:
 517         case BIO_SPEEDUP:
 518         case BIO_ZONE:
 519                 if (bp->bio_cmd == BIO_GETATTR)
 520                         cbp->bio_done = g_eli_getattr_done;
 521                 else
 522                         cbp->bio_done = g_std_done;
 523                 cp = LIST_FIRST(&sc->sc_geom->consumer);
 524                 cbp->bio_to = cp->provider;
 525                 G_ELI_LOGREQ(2, cbp, "Sending request.");
 526                 g_io_request(cbp, cp);
 527                 break;
 528         }
 529 }
 530
 531 static int
 532 g_eli_newsession(struct g_eli_worker *wr)
 533 {
 534         struct g_eli_softc *sc;
 535         struct crypto_session_params csp;
 536         uint32_t caps;
 537         int error, new_crypto;
 538         void *key;
 539
 540         sc = wr->w_softc;
 541
 542         memset(&csp, 0, sizeof(csp));
 543         csp.csp_mode = CSP_MODE_CIPHER;
 544         csp.csp_cipher_alg = sc->sc_ealgo;
 545         csp.csp_ivlen = g_eli_ivlen(sc->sc_ealgo);
 546         csp.csp_cipher_klen = sc->sc_ekeylen / 8;
 547         if (sc->sc_ealgo == CRYPTO_AES_XTS)
 548                 csp.csp_cipher_klen <<= 1;
 549         if ((sc->sc_flags & G_ELI_FLAG_FIRST_KEY) != 0) {
 550                 key = g_eli_key_hold(sc, 0,
 551                     LIST_FIRST(&sc->sc_geom->consumer)->provider->sectorsize);
 552                 csp.csp_cipher_key = key;
 553         } else {
 554                 key = NULL;
 555                 csp.csp_cipher_key = sc->sc_ekey;
 556         }
 557         if (sc->sc_flags & G_ELI_FLAG_AUTH) {
 558                 csp.csp_mode = CSP_MODE_ETA;
 559                 csp.csp_auth_alg = sc->sc_aalgo;
 560                 csp.csp_auth_klen = G_ELI_AUTH_SECKEYLEN;
 561         }
 562
 563         switch (sc->sc_crypto) {
 564         case G_ELI_CRYPTO_SW_ACCEL:
 565         case G_ELI_CRYPTO_SW:
 566                 error = crypto_newsession(&wr->w_sid, &csp,
 567                     CRYPTOCAP_F_SOFTWARE);
 568                 break;
 569         case G_ELI_CRYPTO_HW:
 570                 error = crypto_newsession(&wr->w_sid, &csp,
 571                     CRYPTOCAP_F_HARDWARE);
 572                 break;
 573         case G_ELI_CRYPTO_UNKNOWN:
 574                 error = crypto_newsession(&wr->w_sid, &csp,
 575                     CRYPTOCAP_F_HARDWARE | CRYPTOCAP_F_SOFTWARE);
 576                 if (error == 0) {
 577                         caps = crypto_ses2caps(wr->w_sid);
 578                         if (caps & CRYPTOCAP_F_HARDWARE)
 579                                 new_crypto = G_ELI_CRYPTO_HW;
 580                         else if (caps & CRYPTOCAP_F_ACCEL_SOFTWARE)
 581                                 new_crypto = G_ELI_CRYPTO_SW_ACCEL;
 582                         else
 583                                 new_crypto = G_ELI_CRYPTO_SW;
 584                         mtx_lock(&sc->sc_queue_mtx);
 585                         if (sc->sc_crypto == G_ELI_CRYPTO_UNKNOWN)
 586                                 sc->sc_crypto = new_crypto;
 587                         mtx_unlock(&sc->sc_queue_mtx);
 588                 }
 589                 break;
 590         default:
 591                 panic("%s: invalid condition", __func__);
 592         }
 593
 594         if ((sc->sc_flags & G_ELI_FLAG_FIRST_KEY) != 0) {
 595                 if (error)
 596                         g_eli_key_drop(sc, key);
 597                 else
 598                         wr->w_first_key = key;
 599         }
 600
 601         return (error);
 602 }
 603
 604 static void
 605 g_eli_freesession(struct g_eli_worker *wr)
 606 {
 607         struct g_eli_softc *sc;
 608
 609         crypto_freesession(wr->w_sid);
 610         if (wr->w_first_key != NULL) {
 611                 sc = wr->w_softc;
 612                 g_eli_key_drop(sc, wr->w_first_key);
 613                 wr->w_first_key = NULL;
 614         }
 615 }
 616
 617 static void
 618 g_eli_cancel(struct g_eli_softc *sc)
 619 {
 620         struct bio *bp;
 621
 622         mtx_assert(&sc->sc_queue_mtx, MA_OWNED);
 623
 624         while ((bp = bioq_takefirst(&sc->sc_queue)) != NULL) {
 625                 KASSERT(G_ELI_IS_NEW_BIO(bp->bio_pflags),
 626                     ("Not new bio when canceling (bp=%p).", bp));
 627                 g_io_deliver(bp, ENXIO);
 628         }
 629 }
 630
 631 static struct bio *
 632 g_eli_takefirst(struct g_eli_softc *sc)
 633 {
 634         struct bio *bp;
 635
 636         mtx_assert(&sc->sc_queue_mtx, MA_OWNED);
 637
 638         if (!(sc->sc_flags & G_ELI_FLAG_SUSPEND))
 639                 return (bioq_takefirst(&sc->sc_queue));
 640         /*
 641          * Device suspended, so we skip new I/O requests.
 642          */
 643         TAILQ_FOREACH(bp, &sc->sc_queue.queue, bio_queue) {
 644                 if (!G_ELI_IS_NEW_BIO(bp->bio_pflags))
 645                         break;
 646         }
 647         if (bp != NULL)
 648                 bioq_remove(&sc->sc_queue, bp);
 649         return (bp);
 650 }
 651
 652 /*
 653  * This is the main function for kernel worker thread when we don't have
 654  * hardware acceleration and we have to do cryptography in software.
 655  * Dedicated thread is needed, so we don't slow down g_up/g_down GEOM
 656  * threads with crypto work.
 657  */
 658 static void
 659 g_eli_worker(void *arg)
 660 {
 661         struct g_eli_softc *sc;
 662         struct g_eli_worker *wr;
 663         struct bio *bp;
 664         int error __diagused;
 665
 666         wr = arg;
 667         sc = wr->w_softc;
 668 #ifdef EARLY_AP_STARTUP
 669         MPASS(!sc->sc_cpubind || smp_started);
 670 #elif defined(SMP)
 671         /* Before sched_bind() to a CPU, wait for all CPUs to go on-line. */
 672         if (sc->sc_cpubind) {
 673                 while (!smp_started)
 674                         tsleep(wr, 0, "geli:smp", hz / 4);
 675         }
 676 #endif
 677         thread_lock(curthread);
 678         sched_prio(curthread, PUSER);
 679         if (sc->sc_cpubind)
 680                 sched_bind(curthread, wr->w_number % mp_ncpus);
 681         thread_unlock(curthread);
 682
 683         G_ELI_DEBUG(1, "Thread %s started.", curthread->td_proc->p_comm);
 684
 685         for (;;) {
 686                 mtx_lock(&sc->sc_queue_mtx);
 687 again:
 688                 bp = g_eli_takefirst(sc);
 689                 if (bp == NULL) {
 690                         if (sc->sc_flags & G_ELI_FLAG_DESTROY) {
 691                                 g_eli_cancel(sc);
 692                                 LIST_REMOVE(wr, w_next);
 693                                 g_eli_freesession(wr);
 694                                 free(wr, M_ELI);
 695                                 G_ELI_DEBUG(1, "Thread %s exiting.",
 696                                     curthread->td_proc->p_comm);
 697                                 wakeup(&sc->sc_workers);
 698                                 mtx_unlock(&sc->sc_queue_mtx);
 699                                 kproc_exit(0);
 700                         }
 701                         while (sc->sc_flags & G_ELI_FLAG_SUSPEND) {
 702                                 if (sc->sc_inflight > 0) {
 703                                         G_ELI_DEBUG(0, "inflight=%d",
 704                                             sc->sc_inflight);
 705                                         /*
 706                                          * We still have inflight BIOs, so
 707                                          * sleep and retry.
 708                                          */
 709                                         msleep(sc, &sc->sc_queue_mtx, PRIBIO,
 710                                             "geli:inf", hz / 5);
 711                                         goto again;
 712                                 }
 713                                 /*
 714                                  * Suspend requested, mark the worker as
 715                                  * suspended and go to sleep.
 716                                  */
 717                                 if (wr->w_active) {
 718                                         g_eli_freesession(wr);
 719                                         wr->w_active = FALSE;
 720                                 }
 721                                 wakeup(&sc->sc_workers);
 722                                 msleep(sc, &sc->sc_queue_mtx, PRIBIO,
 723                                     "geli:suspend", 0);
 724                                 if (!wr->w_active &&
 725                                     !(sc->sc_flags & G_ELI_FLAG_SUSPEND)) {
 726                                         error = g_eli_newsession(wr);
 727                                         KASSERT(error == 0,
 728                                             ("g_eli_newsession() failed on resume (error=%d)",
 729                                             error));
 730                                         wr->w_active = TRUE;
 731                                 }
 732                                 goto again;
 733                         }
 734                         msleep(sc, &sc->sc_queue_mtx, PDROP, "geli:w", 0);
 735                         continue;
 736                 }
 737                 if (G_ELI_IS_NEW_BIO(bp->bio_pflags))
 738                         atomic_add_int(&sc->sc_inflight, 1);
 739                 mtx_unlock(&sc->sc_queue_mtx);
 740                 if (G_ELI_IS_NEW_BIO(bp->bio_pflags)) {
 741                         G_ELI_SETWORKER(bp->bio_pflags, 0);
 742                         if (sc->sc_flags & G_ELI_FLAG_AUTH) {
 743                                 if (bp->bio_cmd == BIO_READ)
 744                                         g_eli_auth_read(sc, bp);
 745                                 else
 746                                         g_eli_auth_run(wr, bp);
 747                         } else {
 748                                 if (bp->bio_cmd == BIO_READ)
 749                                         g_eli_crypto_read(sc, bp, 1);
 750                                 else
 751                                         g_eli_crypto_run(wr, bp);
 752                         }
 753                 } else {
 754                         if (sc->sc_flags & G_ELI_FLAG_AUTH)
 755                                 g_eli_auth_run(wr, bp);
 756                         else
 757                                 g_eli_crypto_run(wr, bp);
 758                 }
 759         }
 760 }
 761
 762 static int
 763 g_eli_read_metadata_offset(struct g_class *mp, struct g_provider *pp,
 764     off_t offset, struct g_eli_metadata *md)
 765 {
 766         struct g_geom *gp;
 767         struct g_consumer *cp;
 768         u_char *buf = NULL;
 769         int error;
 770
 771         g_topology_assert();
 772
 773         gp = g_new_geomf(mp, "eli:taste");
 774         gp->start = g_eli_start;
 775         gp->access = g_std_access;
 776         /*
 777          * g_eli_read_metadata() is always called from the event thread.
 778          * Our geom is created and destroyed in the same event, so there
 779          * could be no orphan nor spoil event in the meantime.
 780          */
 781         gp->orphan = g_eli_orphan_spoil_assert;
 782         gp->spoiled = g_eli_orphan_spoil_assert;
 783         cp = g_new_consumer(gp);
 784         cp->flags |= G_CF_DIRECT_SEND | G_CF_DIRECT_RECEIVE;
 785         error = g_attach(cp, pp);
 786         if (error != 0)
 787                 goto end;
 788         error = g_access(cp, 1, 0, 0);
 789         if (error != 0)
 790                 goto end;
 791         g_topology_unlock();
 792         buf = g_read_data(cp, offset, pp->sectorsize, &error);
 793         g_topology_lock();
 794         if (buf == NULL)
 795                 goto end;
 796         error = eli_metadata_decode(buf, md);
 797         if (error != 0)
 798                 goto end;
 799         /* Metadata was read and decoded successfully. */
 800 end:
 801         if (buf != NULL)
 802                 g_free(buf);
 803         if (cp->provider != NULL) {
 804                 if (cp->acr == 1)
 805                         g_access(cp, -1, 0, 0);
 806                 g_detach(cp);
 807         }
 808         g_destroy_consumer(cp);
 809         g_destroy_geom(gp);
 810         return (error);
 811 }
 812
 813 int
 814 g_eli_read_metadata(struct g_class *mp, struct g_provider *pp,
 815     struct g_eli_metadata *md)
 816 {
 817
 818         return (g_eli_read_metadata_offset(mp, pp,
 819             pp->mediasize - pp->sectorsize, md));
 820 }
 821
 822 /*
 823  * The function is called when we had last close on provider and user requested
 824  * to close it when this situation occur.
 825  */
 826 static void
 827 g_eli_last_close(void *arg, int flags __unused)
 828 {
 829         struct g_geom *gp;
 830         char gpname[64];
 831         int error __diagused;
 832
 833         g_topology_assert();
 834         gp = arg;
 835         strlcpy(gpname, gp->name, sizeof(gpname));
 836         error = g_eli_destroy(gp->softc, TRUE);
 837         KASSERT(error == 0, ("Cannot detach %s on last close (error=%d).",
 838             gpname, error));
 839         G_ELI_DEBUG(0, "Detached %s on last close.", gpname);
 840 }
 841
 842 int
 843 g_eli_access(struct g_provider *pp, int dr, int dw, int de)
 844 {
 845         struct g_eli_softc *sc;
 846         struct g_geom *gp;
 847
 848         gp = pp->geom;
 849         sc = gp->softc;
 850
 851         if (dw > 0) {
 852                 if (sc->sc_flags & G_ELI_FLAG_RO) {
 853                         /* Deny write attempts. */
 854                         return (EROFS);
 855                 }
 856                 /* Someone is opening us for write, we need to remember that. */
 857                 sc->sc_flags |= G_ELI_FLAG_WOPEN;
 858                 return (0);
 859         }
 860         /* Is this the last close? */
 861         if (pp->acr + dr > 0 || pp->acw + dw > 0 || pp->ace + de > 0)
 862                 return (0);
 863
 864         /*
 865          * Automatically detach on last close if requested.
 866          */
 867         if ((sc->sc_flags & G_ELI_FLAG_RW_DETACH) ||
 868             (sc->sc_flags & G_ELI_FLAG_WOPEN)) {
 869                 g_post_event(g_eli_last_close, gp, M_WAITOK, NULL);
 870         }
 871         return (0);
 872 }
 873
 874 static int
 875 g_eli_cpu_is_disabled(int cpu)
 876 {
 877 #ifdef SMP
 878         return (CPU_ISSET(cpu, &hlt_cpus_mask));
 879 #else
 880         return (0);
 881 #endif
 882 }
 883
 884 static void
 885 g_eli_init_uma(void)
 886 {
 887
 888         atomic_add_int(&g_eli_devs, 1);
 889         sx_xlock(&g_eli_umalock);
 890         if (g_eli_uma == NULL) {
 891                 /*
 892                  * Calculate the maximum-sized swap buffer we are
 893                  * likely to see.
 894                  */
 895                 g_eli_alloc_sz = roundup2((PAGE_SIZE + sizeof(int) +
 896                     G_ELI_AUTH_SECKEYLEN) * nsw_cluster_max +
 897                     sizeof(uintptr_t), PAGE_SIZE);
 898
 899                 g_eli_uma = uma_zcreate("GELI buffers", g_eli_alloc_sz,
 900                     NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
 901
 902                 /* Reserve and pre-allocate pages, as appropriate. */
 903                 uma_zone_reserve(g_eli_uma, g_eli_minbufs);
 904                 uma_prealloc(g_eli_uma, g_eli_minbufs);
 905         }
 906         sx_xunlock(&g_eli_umalock);
 907 }
 908
 909 /*
 910  * Try to destroy the UMA pool. This will do nothing if there are existing
 911  * GELI devices or existing UMA allocations.
 912  */
 913 static void
 914 g_eli_destroy_uma(void)
 915 {
 916         uma_zone_t oldzone;
 917
 918         sx_xlock(&g_eli_umalock);
 919         /* Ensure we really should be destroying this. */
 920         if (atomic_load_int(&g_eli_devs) == 0 &&
 921             atomic_load_int(&g_eli_umaoutstanding) == 0) {
 922                 oldzone = g_eli_uma;
 923                 g_eli_uma = NULL;
 924         } else
 925                 oldzone = NULL;
 926         sx_xunlock(&g_eli_umalock);
 927
 928         if (oldzone != NULL)
 929                 uma_zdestroy(oldzone);
 930 }
 931
 932 static void
 933 g_eli_fini_uma(void)
 934 {
 935
 936         /*
 937          * If this is the last outstanding GELI device, try to
 938          * destroy the UMA pool.
 939          */
 940         if (atomic_fetchadd_int(&g_eli_devs, -1) == 1)
 941                 g_eli_destroy_uma();
 942 }
 943
 944 /*
 945  * Allocate a data buffer. If the size fits within our swap-sized buffers,
 946  * try to allocate a swap-sized buffer from the UMA pool. Otherwise, fall
 947  * back to using malloc.
 948  *
 949  * Swap-related requests are special: they can only use the UMA pool, they
 950  * use M_USE_RESERVE to let them dip farther into system resources, and
 951  * they always use M_NOWAIT to prevent swap operations from deadlocking.
 952  */
 953 bool
 954 g_eli_alloc_data(struct bio *bp, int sz)
 955 {
 956
 957         KASSERT(sz <= g_eli_alloc_sz || (bp->bio_flags & BIO_SWAP) == 0,
 958             ("BIO_SWAP request for %d bytes exceeds the precalculated buffer"
 959             " size (%d)", sz, g_eli_alloc_sz));
 960         if (sz <= g_eli_alloc_sz) {
 961                 bp->bio_driver2 = uma_zalloc(g_eli_uma, M_NOWAIT |
 962                     ((bp->bio_flags & BIO_SWAP) != 0 ? M_USE_RESERVE : 0));
 963                 if (bp->bio_driver2 != NULL) {
 964                         bp->bio_pflags |= G_ELI_UMA_ALLOC;
 965                         atomic_add_int(&g_eli_umaoutstanding, 1);
 966                 }
 967                 if (bp->bio_driver2 != NULL || (bp->bio_flags & BIO_SWAP) != 0)
 968                         return (bp->bio_driver2 != NULL);
 969         }
 970         bp->bio_pflags &= ~(G_ELI_UMA_ALLOC);
 971         bp->bio_driver2 = malloc(sz, M_ELI, g_eli_blocking_malloc ? M_WAITOK :
 972             M_NOWAIT);
 973         return (bp->bio_driver2 != NULL);
 974 }
 975
 976 /*
 977  * Free a buffer from bp->bio_driver2 which was allocated with
 978  * g_eli_alloc_data(). This function makes sure that the memory is freed
 979  * to the correct place.
 980  *
 981  * Additionally, if this function frees the last outstanding UMA request
 982  * and there are no open GELI devices, this will destroy the UMA pool.
 983  */
 984 void
 985 g_eli_free_data(struct bio *bp)
 986 {
 987
 988         /*
 989          * Mimic the free(9) behavior of allowing a NULL pointer to be
 990          * freed.
 991          */
 992         if (bp->bio_driver2 == NULL)
 993                 return;
 994
 995         if ((bp->bio_pflags & G_ELI_UMA_ALLOC) != 0) {
 996                 uma_zfree(g_eli_uma, bp->bio_driver2);
 997                 if (atomic_fetchadd_int(&g_eli_umaoutstanding, -1) == 1 &&
 998                     atomic_load_int(&g_eli_devs) == 0)
 999                         g_eli_destroy_uma();
1000         } else
1001                 free(bp->bio_driver2, M_ELI);
1002         bp->bio_driver2 = NULL;
1003 }
1004
1005 struct g_geom *
1006 g_eli_create(struct gctl_req *req, struct g_class *mp, struct g_provider *bpp,
1007     const struct g_eli_metadata *md, const u_char *mkey, int nkey)
1008 {
1009         struct g_eli_softc *sc;
1010         struct g_eli_worker *wr;
1011         struct g_geom *gp;
1012         struct g_provider *pp;
1013         struct g_consumer *cp;
1014         struct g_geom_alias *gap;
1015         u_int i, threads;
1016         int dcw, error;
1017
1018         G_ELI_DEBUG(1, "Creating device %s%s.", bpp->name, G_ELI_SUFFIX);
1019         KASSERT(eli_metadata_crypto_supported(md),
1020             ("%s: unsupported crypto for %s", __func__, bpp->name));
1021
1022         gp = g_new_geomf(mp, "%s%s", bpp->name, G_ELI_SUFFIX);
1023         sc = malloc(sizeof(*sc), M_ELI, M_WAITOK | M_ZERO);
1024         gp->start = g_eli_start;
1025         /*
1026          * Spoiling can happen even though we have the provider open
1027          * exclusively, e.g. through media change events.
1028          */
1029         gp->spoiled = g_eli_orphan;
1030         gp->orphan = g_eli_orphan;
1031         gp->resize = g_eli_resize;
1032         gp->dumpconf = g_eli_dumpconf;
1033         /*
1034          * If detach-on-last-close feature is not enabled and we don't operate
1035          * on read-only provider, we can simply use g_std_access().
1036          */
1037         if (md->md_flags & (G_ELI_FLAG_WO_DETACH | G_ELI_FLAG_RO))
1038                 gp->access = g_eli_access;
1039         else
1040                 gp->access = g_std_access;
1041
1042         eli_metadata_softc(sc, md, bpp->sectorsize, bpp->mediasize);
1043         sc->sc_nkey = nkey;
1044
1045         gp->softc = sc;
1046         sc->sc_geom = gp;
1047
1048         bioq_init(&sc->sc_queue);
1049         mtx_init(&sc->sc_queue_mtx, "geli:queue", NULL, MTX_DEF);
1050         mtx_init(&sc->sc_ekeys_lock, "geli:ekeys", NULL, MTX_DEF);
1051
1052         pp = NULL;
1053         cp = g_new_consumer(gp);
1054         cp->flags |= G_CF_DIRECT_SEND | G_CF_DIRECT_RECEIVE;
1055         error = g_attach(cp, bpp);
1056         if (error != 0) {
1057                 if (req != NULL) {
1058                         gctl_error(req, "Cannot attach to %s (error=%d).",
1059                             bpp->name, error);
1060                 } else {
1061                         G_ELI_DEBUG(1, "Cannot attach to %s (error=%d).",
1062                             bpp->name, error);
1063                 }
1064                 goto failed;
1065         }
1066         /*
1067          * Keep provider open all the time, so we can run critical tasks,
1068          * like Master Keys deletion, without wondering if we can open
1069          * provider or not.
1070          * We don't open provider for writing only when user requested read-only
1071          * access.
1072          */
1073         dcw = (sc->sc_flags & G_ELI_FLAG_RO) ? 0 : 1;
1074         error = g_access(cp, 1, dcw, 1);
1075         if (error != 0) {
1076                 if (req != NULL) {
1077                         gctl_error(req, "Cannot access %s (error=%d).",
1078                             bpp->name, error);
1079                 } else {
1080                         G_ELI_DEBUG(1, "Cannot access %s (error=%d).",
1081                             bpp->name, error);
1082                 }
1083                 goto failed;
1084         }
1085
1086         /*
1087          * Remember the keys in our softc structure.
1088          */
1089         g_eli_mkey_propagate(sc, mkey);
1090
1091         LIST_INIT(&sc->sc_workers);
1092
1093         threads = g_eli_threads;
1094         if (threads == 0)
1095                 threads = mp_ncpus;
1096         sc->sc_cpubind = (mp_ncpus > 1 && threads == mp_ncpus);
1097         g_eli_init_uma();
1098         for (i = 0; i < threads; i++) {
1099                 if (g_eli_cpu_is_disabled(i)) {
1100                         G_ELI_DEBUG(1, "%s: CPU %u disabled, skipping.",
1101                             bpp->name, i);
1102                         continue;
1103                 }
1104                 wr = malloc(sizeof(*wr), M_ELI, M_WAITOK | M_ZERO);
1105                 wr->w_softc = sc;
1106                 wr->w_number = i;
1107                 wr->w_active = TRUE;
1108
1109                 error = g_eli_newsession(wr);
1110                 if (error != 0) {
1111                         free(wr, M_ELI);
1112                         if (req != NULL) {
1113                                 gctl_error(req, "Cannot set up crypto session "
1114                                     "for %s (error=%d).", bpp->name, error);
1115                         } else {
1116                                 G_ELI_DEBUG(1, "Cannot set up crypto session "
1117                                     "for %s (error=%d).", bpp->name, error);
1118                         }
1119                         goto failed;
1120                 }
1121
1122                 error = kproc_create(g_eli_worker, wr, &wr->w_proc, 0, 0,
1123                     "g_eli[%u] %s", i, bpp->name);
1124                 if (error != 0) {
1125                         g_eli_freesession(wr);
1126                         free(wr, M_ELI);
1127                         if (req != NULL) {
1128                                 gctl_error(req, "Cannot create kernel thread "
1129                                     "for %s (error=%d).", bpp->name, error);
1130                         } else {
1131                                 G_ELI_DEBUG(1, "Cannot create kernel thread "
1132                                     "for %s (error=%d).", bpp->name, error);
1133                         }
1134                         goto failed;
1135                 }
1136                 LIST_INSERT_HEAD(&sc->sc_workers, wr, w_next);
1137         }
1138
1139         /*
1140          * Create decrypted provider.
1141          */
1142         pp = g_new_providerf(gp, "%s%s", bpp->name, G_ELI_SUFFIX);
1143         pp->flags |= G_PF_DIRECT_SEND | G_PF_DIRECT_RECEIVE;
1144         if (g_eli_unmapped_io && CRYPTO_HAS_VMPAGE) {
1145                 /*
1146                  * On DMAP architectures we can use unmapped I/O.  But don't
1147                  * use it with data integrity verification.  That code hasn't
1148                  * been written yet.
1149                  */
1150                  if ((sc->sc_flags & G_ELI_FLAG_AUTH) == 0)
1151                         pp->flags |= G_PF_ACCEPT_UNMAPPED;
1152         }
1153         pp->mediasize = sc->sc_mediasize;
1154         pp->sectorsize = sc->sc_sectorsize;
1155         LIST_FOREACH(gap, &bpp->aliases, ga_next)
1156                 g_provider_add_alias(pp, "%s%s", gap->ga_alias, G_ELI_SUFFIX);
1157
1158         g_error_provider(pp, 0);
1159
1160         G_ELI_DEBUG(0, "Device %s created.", pp->name);
1161         G_ELI_DEBUG(0, "Encryption: %s %u", g_eli_algo2str(sc->sc_ealgo),
1162             sc->sc_ekeylen);
1163         if (sc->sc_flags & G_ELI_FLAG_AUTH)
1164                 G_ELI_DEBUG(0, " Integrity: %s", g_eli_algo2str(sc->sc_aalgo));
1165         G_ELI_DEBUG(0, "    Crypto: %s",
1166             sc->sc_crypto == G_ELI_CRYPTO_SW_ACCEL ? "accelerated software" :
1167             sc->sc_crypto == G_ELI_CRYPTO_SW ? "software" : "hardware");
1168         return (gp);
1169 failed:
1170         mtx_lock(&sc->sc_queue_mtx);
1171         sc->sc_flags |= G_ELI_FLAG_DESTROY;
1172         wakeup(sc);
1173         /*
1174          * Wait for kernel threads self destruction.
1175          */
1176         while (!LIST_EMPTY(&sc->sc_workers)) {
1177                 msleep(&sc->sc_workers, &sc->sc_queue_mtx, PRIBIO,
1178                     "geli:destroy", 0);
1179         }
1180         mtx_destroy(&sc->sc_queue_mtx);
1181         if (cp->provider != NULL) {
1182                 if (cp->acr == 1)
1183                         g_access(cp, -1, -dcw, -1);
1184                 g_detach(cp);
1185         }
1186         g_destroy_consumer(cp);
1187         g_destroy_geom(gp);
1188         g_eli_key_destroy(sc);
1189         g_eli_fini_uma();
1190         zfree(sc, M_ELI);
1191         return (NULL);
1192 }
1193
1194 int
1195 g_eli_destroy(struct g_eli_softc *sc, boolean_t force)
1196 {
1197         struct g_geom *gp;
1198         struct g_provider *pp;
1199
1200         g_topology_assert();
1201
1202         if (sc == NULL)
1203                 return (ENXIO);
1204
1205         gp = sc->sc_geom;
1206         pp = LIST_FIRST(&gp->provider);
1207         if (pp != NULL && (pp->acr != 0 || pp->acw != 0 || pp->ace != 0)) {
1208                 if (force) {
1209                         G_ELI_DEBUG(1, "Device %s is still open, so it "
1210                             "cannot be definitely removed.", pp->name);
1211                         sc->sc_flags |= G_ELI_FLAG_RW_DETACH;
1212                         gp->access = g_eli_access;
1213                         g_wither_provider(pp, ENXIO);
1214                         return (EBUSY);
1215                 } else {
1216                         G_ELI_DEBUG(1,
1217                             "Device %s is still open (r%dw%de%d).", pp->name,
1218                             pp->acr, pp->acw, pp->ace);
1219                         return (EBUSY);
1220                 }
1221         }
1222
1223         mtx_lock(&sc->sc_queue_mtx);
1224         sc->sc_flags |= G_ELI_FLAG_DESTROY;
1225         wakeup(sc);
1226         while (!LIST_EMPTY(&sc->sc_workers)) {
1227                 msleep(&sc->sc_workers, &sc->sc_queue_mtx, PRIBIO,
1228                     "geli:destroy", 0);
1229         }
1230         mtx_destroy(&sc->sc_queue_mtx);
1231         gp->softc = NULL;
1232         g_eli_key_destroy(sc);
1233         g_eli_fini_uma();
1234         zfree(sc, M_ELI);
1235
1236         G_ELI_DEBUG(0, "Device %s destroyed.", gp->name);
1237         g_wither_geom_close(gp, ENXIO);
1238
1239         return (0);
1240 }
1241
1242 static int
1243 g_eli_destroy_geom(struct gctl_req *req __unused,
1244     struct g_class *mp __unused, struct g_geom *gp)
1245 {
1246         struct g_eli_softc *sc;
1247
1248         sc = gp->softc;
1249         return (g_eli_destroy(sc, FALSE));
1250 }
1251
1252 static int
1253 g_eli_keyfiles_load(struct hmac_ctx *ctx, const char *provider)
1254 {
1255         u_char *keyfile, *data;
1256         char *file, name[64];
1257         size_t size;
1258         int i;
1259
1260         for (i = 0; ; i++) {
1261                 snprintf(name, sizeof(name), "%s:geli_keyfile%d", provider, i);
1262                 keyfile = preload_search_by_type(name);
1263                 if (keyfile == NULL && i == 0) {
1264                         /*
1265                          * If there is only one keyfile, allow simpler name.
1266                          */
1267                         snprintf(name, sizeof(name), "%s:geli_keyfile", provider);
1268                         keyfile = preload_search_by_type(name);
1269                 }
1270                 if (keyfile == NULL)
1271                         return (i);     /* Return number of loaded keyfiles. */
1272                 data = preload_fetch_addr(keyfile);
1273                 if (data == NULL) {
1274                         G_ELI_DEBUG(0, "Cannot find key file data for %s.",
1275                             name);
1276                         return (0);
1277                 }
1278                 size = preload_fetch_size(keyfile);
1279                 if (size == 0) {
1280                         G_ELI_DEBUG(0, "Cannot find key file size for %s.",
1281                             name);
1282                         return (0);
1283                 }
1284                 file = preload_search_info(keyfile, MODINFO_NAME);
1285                 if (file == NULL) {
1286                         G_ELI_DEBUG(0, "Cannot find key file name for %s.",
1287                             name);
1288                         return (0);
1289                 }
1290                 G_ELI_DEBUG(1, "Loaded keyfile %s for %s (type: %s).", file,
1291                     provider, name);
1292                 g_eli_crypto_hmac_update(ctx, data, size);
1293         }
1294 }
1295
1296 static void
1297 g_eli_keyfiles_clear(const char *provider)
1298 {
1299         u_char *keyfile, *data;
1300         char name[64];
1301         size_t size;
1302         int i;
1303
1304         for (i = 0; ; i++) {
1305                 snprintf(name, sizeof(name), "%s:geli_keyfile%d", provider, i);
1306                 keyfile = preload_search_by_type(name);
1307                 if (keyfile == NULL)
1308                         return;
1309                 data = preload_fetch_addr(keyfile);
1310                 size = preload_fetch_size(keyfile);
1311                 if (data != NULL && size != 0)
1312                         explicit_bzero(data, size);
1313         }
1314 }
1315
1316 /*
1317  * Tasting is only made on boot.
1318  * We detect providers which should be attached before root is mounted.
1319  */
1320 static struct g_geom *
1321 g_eli_taste(struct g_class *mp, struct g_provider *pp, int flags __unused)
1322 {
1323         struct g_eli_metadata md;
1324         struct g_geom *gp;
1325         struct hmac_ctx ctx;
1326         char passphrase[256];
1327         u_char key[G_ELI_USERKEYLEN], mkey[G_ELI_DATAIVKEYLEN];
1328         u_int i, nkey, nkeyfiles, tries, showpass;
1329         int error;
1330         struct keybuf *keybuf;
1331
1332         g_trace(G_T_TOPOLOGY, "%s(%s, %s)", __func__, mp->name, pp->name);
1333         g_topology_assert();
1334
1335         if (root_mounted() || g_eli_tries == 0)
1336                 return (NULL);
1337
1338         G_ELI_DEBUG(3, "Tasting %s.", pp->name);
1339
1340         error = g_eli_read_metadata(mp, pp, &md);
1341         if (error != 0)
1342                 return (NULL);
1343         gp = NULL;
1344
1345         if (strcmp(md.md_magic, G_ELI_MAGIC) != 0)
1346                 return (NULL);
1347         if (md.md_version > G_ELI_VERSION) {
1348                 printf("geom_eli.ko module is too old to handle %s.\n",
1349                     pp->name);
1350                 return (NULL);
1351         }
1352         if (md.md_provsize != pp->mediasize)
1353                 return (NULL);
1354         /* Should we attach it on boot? */
1355         if (!(md.md_flags & G_ELI_FLAG_BOOT) &&
1356             !(md.md_flags & G_ELI_FLAG_GELIBOOT))
1357                 return (NULL);
1358         if (md.md_keys == 0x00) {
1359                 G_ELI_DEBUG(0, "No valid keys on %s.", pp->name);
1360                 return (NULL);
1361         }
1362         if (!eli_metadata_crypto_supported(&md)) {
1363                 G_ELI_DEBUG(0, "%s uses invalid or unsupported algorithms\n",
1364                     pp->name);
1365                 return (NULL);
1366         }
1367         if (md.md_iterations == -1) {
1368                 /* If there is no passphrase, we try only once. */
1369                 tries = 1;
1370         } else {
1371                 /* Ask for the passphrase no more than g_eli_tries times. */
1372                 tries = g_eli_tries;
1373         }
1374
1375         if ((keybuf = get_keybuf()) != NULL) {
1376                 /* Scan the key buffer, try all GELI keys. */
1377                 for (i = 0; i < keybuf->kb_nents; i++) {
1378                          if (keybuf->kb_ents[i].ke_type == KEYBUF_TYPE_GELI) {
1379                                  memcpy(key, keybuf->kb_ents[i].ke_data,
1380                                      sizeof(key));
1381
1382                                  if (g_eli_mkey_decrypt_any(&md, key,
1383                                      mkey, &nkey) == 0 ) {
1384                                          explicit_bzero(key, sizeof(key));
1385                                          goto have_key;
1386                                  }
1387                          }
1388                 }
1389         }
1390
1391         for (i = 0; i <= tries; i++) {
1392                 g_eli_crypto_hmac_init(&ctx, NULL, 0);
1393
1394                 /*
1395                  * Load all key files.
1396                  */
1397                 nkeyfiles = g_eli_keyfiles_load(&ctx, pp->name);
1398
1399                 if (nkeyfiles == 0 && md.md_iterations == -1) {
1400                         /*
1401                          * No key files and no passphrase, something is
1402                          * definitely wrong here.
1403                          * geli(8) doesn't allow for such situation, so assume
1404                          * that there was really no passphrase and in that case
1405                          * key files are no properly defined in loader.conf.
1406                          */
1407                         G_ELI_DEBUG(0,
1408                             "Found no key files in loader.conf for %s.",
1409                             pp->name);
1410                         return (NULL);
1411                 }
1412
1413                 /* Ask for the passphrase if defined. */
1414                 if (md.md_iterations >= 0) {
1415                         /* Try first with cached passphrase. */
1416                         if (i == 0) {
1417                                 if (!g_eli_boot_passcache)
1418                                         continue;
1419                                 memcpy(passphrase, cached_passphrase,
1420                                     sizeof(passphrase));
1421                         } else {
1422                                 printf("Enter passphrase for %s: ", pp->name);
1423                                 showpass = g_eli_visible_passphrase;
1424                                 if ((md.md_flags & G_ELI_FLAG_GELIDISPLAYPASS) != 0)
1425                                         showpass = GETS_ECHOPASS;
1426                                 cngets(passphrase, sizeof(passphrase),
1427                                     showpass);
1428                                 memcpy(cached_passphrase, passphrase,
1429                                     sizeof(passphrase));
1430                         }
1431                 }
1432
1433                 /*
1434                  * Prepare Derived-Key from the user passphrase.
1435                  */
1436                 if (md.md_iterations == 0) {
1437                         g_eli_crypto_hmac_update(&ctx, md.md_salt,
1438                             sizeof(md.md_salt));
1439                         g_eli_crypto_hmac_update(&ctx, passphrase,
1440                             strlen(passphrase));
1441                         explicit_bzero(passphrase, sizeof(passphrase));
1442                 } else if (md.md_iterations > 0) {
1443                         u_char dkey[G_ELI_USERKEYLEN];
1444
1445                         pkcs5v2_genkey(dkey, sizeof(dkey), md.md_salt,
1446                             sizeof(md.md_salt), passphrase, md.md_iterations);
1447                         explicit_bzero(passphrase, sizeof(passphrase));
1448                         g_eli_crypto_hmac_update(&ctx, dkey, sizeof(dkey));
1449                         explicit_bzero(dkey, sizeof(dkey));
1450                 }
1451
1452                 g_eli_crypto_hmac_final(&ctx, key, 0);
1453
1454                 /*
1455                  * Decrypt Master-Key.
1456                  */
1457                 error = g_eli_mkey_decrypt_any(&md, key, mkey, &nkey);
1458                 explicit_bzero(key, sizeof(key));
1459                 if (error == -1) {
1460                         if (i == tries) {
1461                                 G_ELI_DEBUG(0,
1462                                     "Wrong key for %s. No tries left.",
1463                                     pp->name);
1464                                 g_eli_keyfiles_clear(pp->name);
1465                                 return (NULL);
1466                         }
1467                         if (i > 0) {
1468                                 G_ELI_DEBUG(0,
1469                                     "Wrong key for %s. Tries left: %u.",
1470                                     pp->name, tries - i);
1471                         }
1472                         /* Try again. */
1473                         continue;
1474                 } else if (error > 0) {
1475                         G_ELI_DEBUG(0,
1476                             "Cannot decrypt Master Key for %s (error=%d).",
1477                             pp->name, error);
1478                         g_eli_keyfiles_clear(pp->name);
1479                         return (NULL);
1480                 }
1481                 g_eli_keyfiles_clear(pp->name);
1482                 G_ELI_DEBUG(1, "Using Master Key %u for %s.", nkey, pp->name);
1483                 break;
1484         }
1485 have_key:
1486
1487         /*
1488          * We have correct key, let's attach provider.
1489          */
1490         gp = g_eli_create(NULL, mp, pp, &md, mkey, nkey);
1491         explicit_bzero(mkey, sizeof(mkey));
1492         explicit_bzero(&md, sizeof(md));
1493         if (gp == NULL) {
1494                 G_ELI_DEBUG(0, "Cannot create device %s%s.", pp->name,
1495                     G_ELI_SUFFIX);
1496                 return (NULL);
1497         }
1498         return (gp);
1499 }
1500
1501 static void
1502 g_eli_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp,
1503     struct g_consumer *cp, struct g_provider *pp)
1504 {
1505         struct g_eli_softc *sc;
1506
1507         g_topology_assert();
1508         sc = gp->softc;
1509         if (sc == NULL)
1510                 return;
1511         if (pp != NULL || cp != NULL)
1512                 return; /* Nothing here. */
1513
1514         sbuf_printf(sb, "%s<KeysTotal>%ju</KeysTotal>\n", indent,
1515             (uintmax_t)sc->sc_ekeys_total);
1516         sbuf_printf(sb, "%s<KeysAllocated>%ju</KeysAllocated>\n", indent,
1517             (uintmax_t)sc->sc_ekeys_allocated);
1518         sbuf_printf(sb, "%s<Flags>", indent);
1519         if (sc->sc_flags == 0)
1520                 sbuf_cat(sb, "NONE");
1521         else {
1522                 int first = 1;
1523
1524 #define ADD_FLAG(flag, name)    do {                                    \
1525         if (sc->sc_flags & (flag)) {                                    \
1526                 if (!first)                                             \
1527                         sbuf_cat(sb, ", ");                             \
1528                 else                                                    \
1529                         first = 0;                                      \
1530                 sbuf_cat(sb, name);                                     \
1531         }                                                               \
1532 } while (0)
1533                 ADD_FLAG(G_ELI_FLAG_SUSPEND, "SUSPEND");
1534                 ADD_FLAG(G_ELI_FLAG_SINGLE_KEY, "SINGLE-KEY");
1535                 ADD_FLAG(G_ELI_FLAG_NATIVE_BYTE_ORDER, "NATIVE-BYTE-ORDER");
1536                 ADD_FLAG(G_ELI_FLAG_ONETIME, "ONETIME");
1537                 ADD_FLAG(G_ELI_FLAG_BOOT, "BOOT");
1538                 ADD_FLAG(G_ELI_FLAG_WO_DETACH, "W-DETACH");
1539                 ADD_FLAG(G_ELI_FLAG_RW_DETACH, "RW-DETACH");
1540                 ADD_FLAG(G_ELI_FLAG_AUTH, "AUTH");
1541                 ADD_FLAG(G_ELI_FLAG_WOPEN, "W-OPEN");
1542                 ADD_FLAG(G_ELI_FLAG_DESTROY, "DESTROY");
1543                 ADD_FLAG(G_ELI_FLAG_RO, "READ-ONLY");
1544                 ADD_FLAG(G_ELI_FLAG_NODELETE, "NODELETE");
1545                 ADD_FLAG(G_ELI_FLAG_GELIBOOT, "GELIBOOT");
1546                 ADD_FLAG(G_ELI_FLAG_GELIDISPLAYPASS, "GELIDISPLAYPASS");
1547                 ADD_FLAG(G_ELI_FLAG_AUTORESIZE, "AUTORESIZE");
1548 #undef  ADD_FLAG
1549         }
1550         sbuf_cat(sb, "</Flags>\n");
1551
1552         if (!(sc->sc_flags & G_ELI_FLAG_ONETIME)) {
1553                 sbuf_printf(sb, "%s<UsedKey>%u</UsedKey>\n", indent,
1554                     sc->sc_nkey);
1555         }
1556         sbuf_printf(sb, "%s<Version>%u</Version>\n", indent, sc->sc_version);
1557         sbuf_printf(sb, "%s<Crypto>", indent);
1558         switch (sc->sc_crypto) {
1559         case G_ELI_CRYPTO_HW:
1560                 sbuf_cat(sb, "hardware");
1561                 break;
1562         case G_ELI_CRYPTO_SW:
1563                 sbuf_cat(sb, "software");
1564                 break;
1565         case G_ELI_CRYPTO_SW_ACCEL:
1566                 sbuf_cat(sb, "accelerated software");
1567                 break;
1568         default:
1569                 sbuf_cat(sb, "UNKNOWN");
1570                 break;
1571         }
1572         sbuf_cat(sb, "</Crypto>\n");
1573         if (sc->sc_flags & G_ELI_FLAG_AUTH) {
1574                 sbuf_printf(sb,
1575                     "%s<AuthenticationAlgorithm>%s</AuthenticationAlgorithm>\n",
1576                     indent, g_eli_algo2str(sc->sc_aalgo));
1577         }
1578         sbuf_printf(sb, "%s<KeyLength>%u</KeyLength>\n", indent,
1579             sc->sc_ekeylen);
1580         sbuf_printf(sb, "%s<EncryptionAlgorithm>%s</EncryptionAlgorithm>\n",
1581             indent, g_eli_algo2str(sc->sc_ealgo));
1582         sbuf_printf(sb, "%s<State>%s</State>\n", indent,
1583             (sc->sc_flags & G_ELI_FLAG_SUSPEND) ? "SUSPENDED" : "ACTIVE");
1584 }
1585
1586 static void
1587 g_eli_shutdown_pre_sync(void *arg, int howto)
1588 {
1589         struct g_class *mp;
1590         struct g_geom *gp, *gp2;
1591         struct g_provider *pp;
1592         struct g_eli_softc *sc;
1593
1594         mp = arg;
1595         g_topology_lock();
1596         LIST_FOREACH_SAFE(gp, &mp->geom, geom, gp2) {
1597                 sc = gp->softc;
1598                 if (sc == NULL)
1599                         continue;
1600                 pp = LIST_FIRST(&gp->provider);
1601                 KASSERT(pp != NULL, ("No provider? gp=%p (%s)", gp, gp->name));
1602                 if (pp->acr != 0 || pp->acw != 0 || pp->ace != 0 ||
1603                     SCHEDULER_STOPPED())
1604                 {
1605                         sc->sc_flags |= G_ELI_FLAG_RW_DETACH;
1606                         gp->access = g_eli_access;
1607                 } else {
1608                         (void) g_eli_destroy(sc, TRUE);
1609                 }
1610         }
1611         g_topology_unlock();
1612 }
1613
1614 static void
1615 g_eli_init(struct g_class *mp)
1616 {
1617
1618         g_eli_pre_sync = EVENTHANDLER_REGISTER(shutdown_pre_sync,
1619             g_eli_shutdown_pre_sync, mp, SHUTDOWN_PRI_FIRST);
1620         if (g_eli_pre_sync == NULL)
1621                 G_ELI_DEBUG(0, "Warning! Cannot register shutdown event.");
1622 }
1623
1624 static void
1625 g_eli_fini(struct g_class *mp)
1626 {
1627
1628         if (g_eli_pre_sync != NULL)
1629                 EVENTHANDLER_DEREGISTER(shutdown_pre_sync, g_eli_pre_sync);
1630 }
1631
1632 DECLARE_GEOM_CLASS(g_eli_class, g_eli);
1633 MODULE_DEPEND(g_eli, crypto, 1, 1, 1);
1634 MODULE_VERSION(geom_eli, 0);