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