29
30#include <sys/param.h>
31#include <sys/systm.h>
32#include <sys/kernel.h>
33#include <sys/linker.h>
34#include <sys/module.h>
35#include <sys/lock.h>
36#include <sys/mutex.h>
37#include <sys/bio.h>
38#include <sys/sysctl.h>
39#include <sys/malloc.h>
40#include <sys/kthread.h>
41#include <sys/proc.h>
42#include <sys/sched.h>
43#include <sys/smp.h>
44#include <sys/uio.h>
45#include <sys/vnode.h>
46
47#include <vm/uma.h>
48
49#include <geom/geom.h>
50#include <geom/eli/g_eli.h>
51#include <geom/eli/pkcs5v2.h>
52
53
54MALLOC_DEFINE(M_ELI, "eli data", "GEOM_ELI Data");
55
56SYSCTL_DECL(_kern_geom);
57SYSCTL_NODE(_kern_geom, OID_AUTO, eli, CTLFLAG_RW, 0, "GEOM_ELI stuff");
58u_int g_eli_debug = 0;
59TUNABLE_INT("kern.geom.eli.debug", &g_eli_debug);
60SYSCTL_UINT(_kern_geom_eli, OID_AUTO, debug, CTLFLAG_RW, &g_eli_debug, 0,
61 "Debug level");
62static u_int g_eli_tries = 3;
63TUNABLE_INT("kern.geom.eli.tries", &g_eli_tries);
64SYSCTL_UINT(_kern_geom_eli, OID_AUTO, tries, CTLFLAG_RW, &g_eli_tries, 0,
65 "Number of tries for entering the passphrase");
66static u_int g_eli_visible_passphrase = 0;
67TUNABLE_INT("kern.geom.eli.visible_passphrase", &g_eli_visible_passphrase);
68SYSCTL_UINT(_kern_geom_eli, OID_AUTO, visible_passphrase, CTLFLAG_RW,
69 &g_eli_visible_passphrase, 0,
70 "Turn on echo when entering the passphrase (for debug purposes only!!)");
71u_int g_eli_overwrites = 5;
72TUNABLE_INT("kern.geom.eli.overwrites", &g_eli_overwrites);
73SYSCTL_UINT(_kern_geom_eli, OID_AUTO, overwrites, CTLFLAG_RW, &g_eli_overwrites,
74 0, "Number of times on-disk keys should be overwritten when destroying them");
75static u_int g_eli_threads = 0;
76TUNABLE_INT("kern.geom.eli.threads", &g_eli_threads);
77SYSCTL_UINT(_kern_geom_eli, OID_AUTO, threads, CTLFLAG_RW, &g_eli_threads, 0,
78 "Number of threads doing crypto work");
79u_int g_eli_batch = 0;
80TUNABLE_INT("kern.geom.eli.batch", &g_eli_batch);
81SYSCTL_UINT(_kern_geom_eli, OID_AUTO, batch, CTLFLAG_RW, &g_eli_batch, 0,
82 "Use crypto operations batching");
83
84static int g_eli_destroy_geom(struct gctl_req *req, struct g_class *mp,
85 struct g_geom *gp);
86
87static g_taste_t g_eli_taste;
88static g_dumpconf_t g_eli_dumpconf;
89
90struct g_class g_eli_class = {
91 .name = G_ELI_CLASS_NAME,
92 .version = G_VERSION,
93 .ctlreq = g_eli_config,
94 .taste = g_eli_taste,
95 .destroy_geom = g_eli_destroy_geom
96};
97
98
99/*
100 * Code paths:
101 * BIO_READ:
102 * g_eli_start -> g_io_request -> g_eli_read_done -> g_eli_crypto_run -> g_eli_crypto_read_done -> g_io_deliver
103 * BIO_WRITE:
104 * g_eli_start -> g_eli_crypto_run -> g_eli_crypto_write_done -> g_io_request -> g_eli_write_done -> g_io_deliver
105 */
106
107
108/*
109 * EAGAIN from crypto(9) means, that we were probably balanced to another crypto
110 * accelerator or something like this.
111 * The function updates the SID and rerun the operation.
112 */
113int
114g_eli_crypto_rerun(struct cryptop *crp)
115{
116 struct g_eli_softc *sc;
117 struct g_eli_worker *wr;
118 struct bio *bp;
119 int error;
120
121 bp = (struct bio *)crp->crp_opaque;
122 sc = bp->bio_to->geom->softc;
123 LIST_FOREACH(wr, &sc->sc_workers, w_next) {
124 if (wr->w_number == bp->bio_pflags)
125 break;
126 }
127 KASSERT(wr != NULL, ("Invalid worker (%u).", bp->bio_pflags));
128 G_ELI_DEBUG(1, "Rerunning crypto %s request (sid: %ju -> %ju).",
129 bp->bio_cmd == BIO_READ ? "READ" : "WRITE", (uintmax_t)wr->w_sid,
130 (uintmax_t)crp->crp_sid);
131 wr->w_sid = crp->crp_sid;
132 crp->crp_etype = 0;
133 error = crypto_dispatch(crp);
134 if (error == 0)
135 return (0);
136 G_ELI_DEBUG(1, "%s: crypto_dispatch() returned %d.", __func__, error);
137 crp->crp_etype = error;
138 return (error);
139}
140
141/*
142 * The function is called afer reading encrypted data from the provider.
143 *
144 * g_eli_start -> g_io_request -> G_ELI_READ_DONE -> g_eli_crypto_run -> g_eli_crypto_read_done -> g_io_deliver
145 */
146void
147g_eli_read_done(struct bio *bp)
148{
149 struct g_eli_softc *sc;
150 struct bio *pbp;
151
152 G_ELI_LOGREQ(2, bp, "Request done.");
153 pbp = bp->bio_parent;
154 if (pbp->bio_error == 0)
155 pbp->bio_error = bp->bio_error;
156 /*
157 * Do we have all sectors already?
158 */
159 pbp->bio_inbed++;
160 if (pbp->bio_inbed < pbp->bio_children)
161 return;
162 g_destroy_bio(bp);
163 if (pbp->bio_error != 0) {
164 G_ELI_LOGREQ(0, pbp, "%s() failed", __func__);
165 pbp->bio_completed = 0;
166 if (pbp->bio_driver2 != NULL) {
167 free(pbp->bio_driver2, M_ELI);
168 pbp->bio_driver2 = NULL;
169 }
170 g_io_deliver(pbp, pbp->bio_error);
171 return;
172 }
173 sc = pbp->bio_to->geom->softc;
174 mtx_lock(&sc->sc_queue_mtx);
175 bioq_insert_tail(&sc->sc_queue, pbp);
176 mtx_unlock(&sc->sc_queue_mtx);
177 wakeup(sc);
178}
179
180/*
181 * The function is called after we encrypt and write data.
182 *
183 * g_eli_start -> g_eli_crypto_run -> g_eli_crypto_write_done -> g_io_request -> G_ELI_WRITE_DONE -> g_io_deliver
184 */
185void
186g_eli_write_done(struct bio *bp)
187{
188 struct bio *pbp;
189
190 G_ELI_LOGREQ(2, bp, "Request done.");
191 pbp = bp->bio_parent;
192 if (pbp->bio_error == 0) {
193 if (bp->bio_error != 0)
194 pbp->bio_error = bp->bio_error;
195 }
196 /*
197 * Do we have all sectors already?
198 */
199 pbp->bio_inbed++;
200 if (pbp->bio_inbed < pbp->bio_children)
201 return;
202 free(pbp->bio_driver2, M_ELI);
203 pbp->bio_driver2 = NULL;
204 if (pbp->bio_error != 0) {
205 G_ELI_LOGREQ(0, pbp, "Crypto WRITE request failed (error=%d).",
206 pbp->bio_error);
207 pbp->bio_completed = 0;
208 }
209 g_destroy_bio(bp);
210 /*
211 * Write is finished, send it up.
212 */
213 pbp->bio_completed = pbp->bio_length;
214 g_io_deliver(pbp, pbp->bio_error);
215}
216
217/*
218 * This function should never be called, but GEOM made as it set ->orphan()
219 * method for every geom.
220 */
221static void
222g_eli_orphan_spoil_assert(struct g_consumer *cp)
223{
224
225 panic("Function %s() called for %s.", __func__, cp->geom->name);
226}
227
228static void
229g_eli_orphan(struct g_consumer *cp)
230{
231 struct g_eli_softc *sc;
232
233 g_topology_assert();
234 sc = cp->geom->softc;
235 if (sc == NULL)
236 return;
237 g_eli_destroy(sc, 1);
238}
239
240/*
241 * BIO_READ : G_ELI_START -> g_io_request -> g_eli_read_done -> g_eli_crypto_run -> g_eli_crypto_read_done -> g_io_deliver
242 * BIO_WRITE: G_ELI_START -> g_eli_crypto_run -> g_eli_crypto_write_done -> g_io_request -> g_eli_write_done -> g_io_deliver
243 */
244static void
245g_eli_start(struct bio *bp)
246{
247 struct g_eli_softc *sc;
248 struct g_consumer *cp;
249 struct bio *cbp;
250
251 sc = bp->bio_to->geom->softc;
252 KASSERT(sc != NULL,
253 ("Provider's error should be set (error=%d)(device=%s).",
254 bp->bio_to->error, bp->bio_to->name));
255 G_ELI_LOGREQ(2, bp, "Request received.");
256
257 switch (bp->bio_cmd) {
258 case BIO_READ:
259 case BIO_WRITE:
260 case BIO_GETATTR:
261 break;
262 case BIO_DELETE:
263 /*
264 * We could eventually support BIO_DELETE request.
265 * It could be done by overwritting requested sector with
266 * random data g_eli_overwrites number of times.
267 */
| 29
30#include <sys/param.h>
31#include <sys/systm.h>
32#include <sys/kernel.h>
33#include <sys/linker.h>
34#include <sys/module.h>
35#include <sys/lock.h>
36#include <sys/mutex.h>
37#include <sys/bio.h>
38#include <sys/sysctl.h>
39#include <sys/malloc.h>
40#include <sys/kthread.h>
41#include <sys/proc.h>
42#include <sys/sched.h>
43#include <sys/smp.h>
44#include <sys/uio.h>
45#include <sys/vnode.h>
46
47#include <vm/uma.h>
48
49#include <geom/geom.h>
50#include <geom/eli/g_eli.h>
51#include <geom/eli/pkcs5v2.h>
52
53
54MALLOC_DEFINE(M_ELI, "eli data", "GEOM_ELI Data");
55
56SYSCTL_DECL(_kern_geom);
57SYSCTL_NODE(_kern_geom, OID_AUTO, eli, CTLFLAG_RW, 0, "GEOM_ELI stuff");
58u_int g_eli_debug = 0;
59TUNABLE_INT("kern.geom.eli.debug", &g_eli_debug);
60SYSCTL_UINT(_kern_geom_eli, OID_AUTO, debug, CTLFLAG_RW, &g_eli_debug, 0,
61 "Debug level");
62static u_int g_eli_tries = 3;
63TUNABLE_INT("kern.geom.eli.tries", &g_eli_tries);
64SYSCTL_UINT(_kern_geom_eli, OID_AUTO, tries, CTLFLAG_RW, &g_eli_tries, 0,
65 "Number of tries for entering the passphrase");
66static u_int g_eli_visible_passphrase = 0;
67TUNABLE_INT("kern.geom.eli.visible_passphrase", &g_eli_visible_passphrase);
68SYSCTL_UINT(_kern_geom_eli, OID_AUTO, visible_passphrase, CTLFLAG_RW,
69 &g_eli_visible_passphrase, 0,
70 "Turn on echo when entering the passphrase (for debug purposes only!!)");
71u_int g_eli_overwrites = 5;
72TUNABLE_INT("kern.geom.eli.overwrites", &g_eli_overwrites);
73SYSCTL_UINT(_kern_geom_eli, OID_AUTO, overwrites, CTLFLAG_RW, &g_eli_overwrites,
74 0, "Number of times on-disk keys should be overwritten when destroying them");
75static u_int g_eli_threads = 0;
76TUNABLE_INT("kern.geom.eli.threads", &g_eli_threads);
77SYSCTL_UINT(_kern_geom_eli, OID_AUTO, threads, CTLFLAG_RW, &g_eli_threads, 0,
78 "Number of threads doing crypto work");
79u_int g_eli_batch = 0;
80TUNABLE_INT("kern.geom.eli.batch", &g_eli_batch);
81SYSCTL_UINT(_kern_geom_eli, OID_AUTO, batch, CTLFLAG_RW, &g_eli_batch, 0,
82 "Use crypto operations batching");
83
84static int g_eli_destroy_geom(struct gctl_req *req, struct g_class *mp,
85 struct g_geom *gp);
86
87static g_taste_t g_eli_taste;
88static g_dumpconf_t g_eli_dumpconf;
89
90struct g_class g_eli_class = {
91 .name = G_ELI_CLASS_NAME,
92 .version = G_VERSION,
93 .ctlreq = g_eli_config,
94 .taste = g_eli_taste,
95 .destroy_geom = g_eli_destroy_geom
96};
97
98
99/*
100 * Code paths:
101 * BIO_READ:
102 * g_eli_start -> g_io_request -> g_eli_read_done -> g_eli_crypto_run -> g_eli_crypto_read_done -> g_io_deliver
103 * BIO_WRITE:
104 * g_eli_start -> g_eli_crypto_run -> g_eli_crypto_write_done -> g_io_request -> g_eli_write_done -> g_io_deliver
105 */
106
107
108/*
109 * EAGAIN from crypto(9) means, that we were probably balanced to another crypto
110 * accelerator or something like this.
111 * The function updates the SID and rerun the operation.
112 */
113int
114g_eli_crypto_rerun(struct cryptop *crp)
115{
116 struct g_eli_softc *sc;
117 struct g_eli_worker *wr;
118 struct bio *bp;
119 int error;
120
121 bp = (struct bio *)crp->crp_opaque;
122 sc = bp->bio_to->geom->softc;
123 LIST_FOREACH(wr, &sc->sc_workers, w_next) {
124 if (wr->w_number == bp->bio_pflags)
125 break;
126 }
127 KASSERT(wr != NULL, ("Invalid worker (%u).", bp->bio_pflags));
128 G_ELI_DEBUG(1, "Rerunning crypto %s request (sid: %ju -> %ju).",
129 bp->bio_cmd == BIO_READ ? "READ" : "WRITE", (uintmax_t)wr->w_sid,
130 (uintmax_t)crp->crp_sid);
131 wr->w_sid = crp->crp_sid;
132 crp->crp_etype = 0;
133 error = crypto_dispatch(crp);
134 if (error == 0)
135 return (0);
136 G_ELI_DEBUG(1, "%s: crypto_dispatch() returned %d.", __func__, error);
137 crp->crp_etype = error;
138 return (error);
139}
140
141/*
142 * The function is called afer reading encrypted data from the provider.
143 *
144 * g_eli_start -> g_io_request -> G_ELI_READ_DONE -> g_eli_crypto_run -> g_eli_crypto_read_done -> g_io_deliver
145 */
146void
147g_eli_read_done(struct bio *bp)
148{
149 struct g_eli_softc *sc;
150 struct bio *pbp;
151
152 G_ELI_LOGREQ(2, bp, "Request done.");
153 pbp = bp->bio_parent;
154 if (pbp->bio_error == 0)
155 pbp->bio_error = bp->bio_error;
156 /*
157 * Do we have all sectors already?
158 */
159 pbp->bio_inbed++;
160 if (pbp->bio_inbed < pbp->bio_children)
161 return;
162 g_destroy_bio(bp);
163 if (pbp->bio_error != 0) {
164 G_ELI_LOGREQ(0, pbp, "%s() failed", __func__);
165 pbp->bio_completed = 0;
166 if (pbp->bio_driver2 != NULL) {
167 free(pbp->bio_driver2, M_ELI);
168 pbp->bio_driver2 = NULL;
169 }
170 g_io_deliver(pbp, pbp->bio_error);
171 return;
172 }
173 sc = pbp->bio_to->geom->softc;
174 mtx_lock(&sc->sc_queue_mtx);
175 bioq_insert_tail(&sc->sc_queue, pbp);
176 mtx_unlock(&sc->sc_queue_mtx);
177 wakeup(sc);
178}
179
180/*
181 * The function is called after we encrypt and write data.
182 *
183 * g_eli_start -> g_eli_crypto_run -> g_eli_crypto_write_done -> g_io_request -> G_ELI_WRITE_DONE -> g_io_deliver
184 */
185void
186g_eli_write_done(struct bio *bp)
187{
188 struct bio *pbp;
189
190 G_ELI_LOGREQ(2, bp, "Request done.");
191 pbp = bp->bio_parent;
192 if (pbp->bio_error == 0) {
193 if (bp->bio_error != 0)
194 pbp->bio_error = bp->bio_error;
195 }
196 /*
197 * Do we have all sectors already?
198 */
199 pbp->bio_inbed++;
200 if (pbp->bio_inbed < pbp->bio_children)
201 return;
202 free(pbp->bio_driver2, M_ELI);
203 pbp->bio_driver2 = NULL;
204 if (pbp->bio_error != 0) {
205 G_ELI_LOGREQ(0, pbp, "Crypto WRITE request failed (error=%d).",
206 pbp->bio_error);
207 pbp->bio_completed = 0;
208 }
209 g_destroy_bio(bp);
210 /*
211 * Write is finished, send it up.
212 */
213 pbp->bio_completed = pbp->bio_length;
214 g_io_deliver(pbp, pbp->bio_error);
215}
216
217/*
218 * This function should never be called, but GEOM made as it set ->orphan()
219 * method for every geom.
220 */
221static void
222g_eli_orphan_spoil_assert(struct g_consumer *cp)
223{
224
225 panic("Function %s() called for %s.", __func__, cp->geom->name);
226}
227
228static void
229g_eli_orphan(struct g_consumer *cp)
230{
231 struct g_eli_softc *sc;
232
233 g_topology_assert();
234 sc = cp->geom->softc;
235 if (sc == NULL)
236 return;
237 g_eli_destroy(sc, 1);
238}
239
240/*
241 * BIO_READ : G_ELI_START -> g_io_request -> g_eli_read_done -> g_eli_crypto_run -> g_eli_crypto_read_done -> g_io_deliver
242 * BIO_WRITE: G_ELI_START -> g_eli_crypto_run -> g_eli_crypto_write_done -> g_io_request -> g_eli_write_done -> g_io_deliver
243 */
244static void
245g_eli_start(struct bio *bp)
246{
247 struct g_eli_softc *sc;
248 struct g_consumer *cp;
249 struct bio *cbp;
250
251 sc = bp->bio_to->geom->softc;
252 KASSERT(sc != NULL,
253 ("Provider's error should be set (error=%d)(device=%s).",
254 bp->bio_to->error, bp->bio_to->name));
255 G_ELI_LOGREQ(2, bp, "Request received.");
256
257 switch (bp->bio_cmd) {
258 case BIO_READ:
259 case BIO_WRITE:
260 case BIO_GETATTR:
261 break;
262 case BIO_DELETE:
263 /*
264 * We could eventually support BIO_DELETE request.
265 * It could be done by overwritting requested sector with
266 * random data g_eli_overwrites number of times.
267 */
|
269 g_io_deliver(bp, EOPNOTSUPP);
270 return;
271 }
272 cbp = g_clone_bio(bp);
273 if (cbp == NULL) {
274 g_io_deliver(bp, ENOMEM);
275 return;
276 }
277 switch (bp->bio_cmd) {
278 case BIO_READ:
279 if (!(sc->sc_flags & G_ELI_FLAG_AUTH)) {
280 bp->bio_driver2 = NULL;
281 cbp->bio_done = g_eli_read_done;
282 cp = LIST_FIRST(&sc->sc_geom->consumer);
283 cbp->bio_to = cp->provider;
284 G_ELI_LOGREQ(2, cbp, "Sending request.");
285 /*
286 * Read encrypted data from provider.
287 */
288 g_io_request(cbp, cp);
289 break;
290 }
291 bp->bio_pflags = 255;
292 /* FALLTHROUGH */
293 case BIO_WRITE:
294 bp->bio_driver1 = cbp;
295 mtx_lock(&sc->sc_queue_mtx);
296 bioq_insert_tail(&sc->sc_queue, bp);
297 mtx_unlock(&sc->sc_queue_mtx);
298 wakeup(sc);
299 break;
300 case BIO_GETATTR:
301 cbp->bio_done = g_std_done;
302 cp = LIST_FIRST(&sc->sc_geom->consumer);
303 cbp->bio_to = cp->provider;
304 G_ELI_LOGREQ(2, cbp, "Sending request.");
305 g_io_request(cbp, cp);
306 break;
307 }
308}
309
310/*
311 * This is the main function for kernel worker thread when we don't have
312 * hardware acceleration and we have to do cryptography in software.
313 * Dedicated thread is needed, so we don't slow down g_up/g_down GEOM
314 * threads with crypto work.
315 */
316static void
317g_eli_worker(void *arg)
318{
319 struct g_eli_softc *sc;
320 struct g_eli_worker *wr;
321 struct bio *bp;
322
323 wr = arg;
324 sc = wr->w_softc;
325 mtx_lock_spin(&sched_lock);
326 sched_prio(curthread, PRIBIO);
327 if (sc->sc_crypto == G_ELI_CRYPTO_SW && g_eli_threads == 0)
328 sched_bind(curthread, wr->w_number);
329 mtx_unlock_spin(&sched_lock);
330
331 G_ELI_DEBUG(1, "Thread %s started.", curthread->td_proc->p_comm);
332
333 for (;;) {
334 mtx_lock(&sc->sc_queue_mtx);
335 bp = bioq_takefirst(&sc->sc_queue);
336 if (bp == NULL) {
337 if (sc->sc_flags & G_ELI_FLAG_DESTROY) {
338 LIST_REMOVE(wr, w_next);
339 crypto_freesession(wr->w_sid);
340 free(wr, M_ELI);
341 G_ELI_DEBUG(1, "Thread %s exiting.",
342 curthread->td_proc->p_comm);
343 wakeup(&sc->sc_workers);
344 mtx_unlock(&sc->sc_queue_mtx);
345 kthread_exit(0);
346 }
347 msleep(sc, &sc->sc_queue_mtx, PRIBIO | PDROP,
348 "geli:w", 0);
349 continue;
350 }
351 mtx_unlock(&sc->sc_queue_mtx);
352 if (bp->bio_cmd == BIO_READ && bp->bio_pflags == 255)
353 g_eli_auth_read(sc, bp);
354 else if (sc->sc_flags & G_ELI_FLAG_AUTH)
355 g_eli_auth_run(wr, bp);
356 else
357 g_eli_crypto_run(wr, bp);
358 }
359}
360
361/*
362 * Here we generate IV. It is unique for every sector.
363 */
364void
365g_eli_crypto_ivgen(struct g_eli_softc *sc, off_t offset, u_char *iv,
366 size_t size)
367{
368 u_char off[8], hash[SHA256_DIGEST_LENGTH];
369 SHA256_CTX ctx;
370
371 if (!(sc->sc_flags & G_ELI_FLAG_NATIVE_BYTE_ORDER))
372 le64enc(off, (uint64_t)offset);
373 /* Copy precalculated SHA256 context for IV-Key. */
374 bcopy(&sc->sc_ivctx, &ctx, sizeof(ctx));
375 SHA256_Update(&ctx, (uint8_t *)&offset, sizeof(offset));
376 SHA256_Final(hash, &ctx);
377 bcopy(hash, iv, size);
378}
379
380int
381g_eli_read_metadata(struct g_class *mp, struct g_provider *pp,
382 struct g_eli_metadata *md)
383{
384 struct g_geom *gp;
385 struct g_consumer *cp;
386 u_char *buf = NULL;
387 int error;
388
389 g_topology_assert();
390
391 gp = g_new_geomf(mp, "eli:taste");
392 gp->start = g_eli_start;
393 gp->access = g_std_access;
394 /*
395 * g_eli_read_metadata() is always called from the event thread.
396 * Our geom is created and destroyed in the same event, so there
397 * could be no orphan nor spoil event in the meantime.
398 */
399 gp->orphan = g_eli_orphan_spoil_assert;
400 gp->spoiled = g_eli_orphan_spoil_assert;
401 cp = g_new_consumer(gp);
402 error = g_attach(cp, pp);
403 if (error != 0)
404 goto end;
405 error = g_access(cp, 1, 0, 0);
406 if (error != 0)
407 goto end;
408 g_topology_unlock();
409 buf = g_read_data(cp, pp->mediasize - pp->sectorsize, pp->sectorsize,
410 &error);
411 g_topology_lock();
412 if (buf == NULL)
413 goto end;
414 eli_metadata_decode(buf, md);
415end:
416 if (buf != NULL)
417 g_free(buf);
418 if (cp->provider != NULL) {
419 if (cp->acr == 1)
420 g_access(cp, -1, 0, 0);
421 g_detach(cp);
422 }
423 g_destroy_consumer(cp);
424 g_destroy_geom(gp);
425 return (error);
426}
427
428/*
429 * The function is called when we had last close on provider and user requested
430 * to close it when this situation occur.
431 */
432static void
433g_eli_last_close(struct g_eli_softc *sc)
434{
435 struct g_geom *gp;
436 struct g_provider *pp;
437 char ppname[64];
438 int error;
439
440 g_topology_assert();
441 gp = sc->sc_geom;
442 pp = LIST_FIRST(&gp->provider);
443 strlcpy(ppname, pp->name, sizeof(ppname));
444 error = g_eli_destroy(sc, 1);
445 KASSERT(error == 0, ("Cannot detach %s on last close (error=%d).",
446 ppname, error));
447 G_ELI_DEBUG(0, "Detached %s on last close.", ppname);
448}
449
450int
451g_eli_access(struct g_provider *pp, int dr, int dw, int de)
452{
453 struct g_eli_softc *sc;
454 struct g_geom *gp;
455
456 gp = pp->geom;
457 sc = gp->softc;
458
459 if (dw > 0) {
460 if (sc->sc_flags & G_ELI_FLAG_RO) {
461 /* Deny write attempts. */
462 return (EROFS);
463 }
464 /* Someone is opening us for write, we need to remember that. */
465 sc->sc_flags |= G_ELI_FLAG_WOPEN;
466 return (0);
467 }
468 /* Is this the last close? */
469 if (pp->acr + dr > 0 || pp->acw + dw > 0 || pp->ace + de > 0)
470 return (0);
471
472 /*
473 * Automatically detach on last close if requested.
474 */
475 if ((sc->sc_flags & G_ELI_FLAG_RW_DETACH) ||
476 (sc->sc_flags & G_ELI_FLAG_WOPEN)) {
477 g_eli_last_close(sc);
478 }
479 return (0);
480}
481
482struct g_geom *
483g_eli_create(struct gctl_req *req, struct g_class *mp, struct g_provider *bpp,
484 const struct g_eli_metadata *md, const u_char *mkey, int nkey)
485{
486 struct g_eli_softc *sc;
487 struct g_eli_worker *wr;
488 struct g_geom *gp;
489 struct g_provider *pp;
490 struct g_consumer *cp;
491 struct cryptoini crie, cria;
492 u_int i, threads;
493 int error;
494
495 G_ELI_DEBUG(1, "Creating device %s%s.", bpp->name, G_ELI_SUFFIX);
496
497 gp = g_new_geomf(mp, "%s%s", bpp->name, G_ELI_SUFFIX);
498 gp->softc = NULL; /* for a moment */
499
500 sc = malloc(sizeof(*sc), M_ELI, M_WAITOK | M_ZERO);
501 gp->start = g_eli_start;
502 /*
503 * Spoiling cannot happen actually, because we keep provider open for
504 * writing all the time or provider is read-only.
505 */
506 gp->spoiled = g_eli_orphan_spoil_assert;
507 gp->orphan = g_eli_orphan;
508 gp->dumpconf = g_eli_dumpconf;
509 /*
510 * If detach-on-last-close feature is not enabled and we don't operate
511 * on read-only provider, we can simply use g_std_access().
512 */
513 if (md->md_flags & (G_ELI_FLAG_WO_DETACH | G_ELI_FLAG_RO))
514 gp->access = g_eli_access;
515 else
516 gp->access = g_std_access;
517
518 sc->sc_crypto = G_ELI_CRYPTO_SW;
519 sc->sc_flags = md->md_flags;
520 /* Backward compatibility. */
521 if (md->md_version < 2)
522 sc->sc_flags |= G_ELI_FLAG_NATIVE_BYTE_ORDER;
523 sc->sc_ealgo = md->md_ealgo;
524 sc->sc_nkey = nkey;
525 /*
526 * Remember the keys in our softc structure.
527 */
528 g_eli_mkey_propagate(sc, mkey);
529 sc->sc_ekeylen = md->md_keylen;
530
531 if (sc->sc_flags & G_ELI_FLAG_AUTH) {
532 sc->sc_akeylen = sizeof(sc->sc_akey) * 8;
533 sc->sc_aalgo = md->md_aalgo;
534 sc->sc_alen = g_eli_hashlen(sc->sc_aalgo);
535
536 sc->sc_data_per_sector = bpp->sectorsize - sc->sc_alen;
537 /*
538 * Some hash functions (like SHA1 and RIPEMD160) generates hash
539 * which length is not multiple of 128 bits, but we want data
540 * length to be multiple of 128, so we can encrypt without
541 * padding. The line below rounds down data length to multiple
542 * of 128 bits.
543 */
544 sc->sc_data_per_sector -= sc->sc_data_per_sector % 16;
545
546 sc->sc_bytes_per_sector =
547 (md->md_sectorsize - 1) / sc->sc_data_per_sector + 1;
548 sc->sc_bytes_per_sector *= bpp->sectorsize;
549 /*
550 * Precalculate SHA256 for HMAC key generation.
551 * This is expensive operation and we can do it only once now or
552 * for every access to sector, so now will be much better.
553 */
554 SHA256_Init(&sc->sc_akeyctx);
555 SHA256_Update(&sc->sc_akeyctx, sc->sc_akey,
556 sizeof(sc->sc_akey));
557 }
558
559 /*
560 * Precalculate SHA256 for IV generation.
561 * This is expensive operation and we can do it only once now or for
562 * every access to sector, so now will be much better.
563 */
564 SHA256_Init(&sc->sc_ivctx);
565 SHA256_Update(&sc->sc_ivctx, sc->sc_ivkey, sizeof(sc->sc_ivkey));
566
567 gp->softc = sc;
568 sc->sc_geom = gp;
569
570 bioq_init(&sc->sc_queue);
571 mtx_init(&sc->sc_queue_mtx, "geli:queue", NULL, MTX_DEF);
572
573 pp = NULL;
574 cp = g_new_consumer(gp);
575 error = g_attach(cp, bpp);
576 if (error != 0) {
577 if (req != NULL) {
578 gctl_error(req, "Cannot attach to %s (error=%d).",
579 bpp->name, error);
580 } else {
581 G_ELI_DEBUG(1, "Cannot attach to %s (error=%d).",
582 bpp->name, error);
583 }
584 goto failed;
585 }
586 /*
587 * Keep provider open all the time, so we can run critical tasks,
588 * like Master Keys deletion, without wondering if we can open
589 * provider or not.
590 * We don't open provider for writing only when user requested read-only
591 * access.
592 */
593 if (sc->sc_flags & G_ELI_FLAG_RO)
594 error = g_access(cp, 1, 0, 1);
595 else
596 error = g_access(cp, 1, 1, 1);
597 if (error != 0) {
598 if (req != NULL) {
599 gctl_error(req, "Cannot access %s (error=%d).",
600 bpp->name, error);
601 } else {
602 G_ELI_DEBUG(1, "Cannot access %s (error=%d).",
603 bpp->name, error);
604 }
605 goto failed;
606 }
607
608 LIST_INIT(&sc->sc_workers);
609
610 bzero(&crie, sizeof(crie));
611 crie.cri_alg = sc->sc_ealgo;
612 crie.cri_klen = sc->sc_ekeylen;
613 crie.cri_key = sc->sc_ekey;
614 if (sc->sc_flags & G_ELI_FLAG_AUTH) {
615 bzero(&cria, sizeof(cria));
616 cria.cri_alg = sc->sc_aalgo;
617 cria.cri_klen = sc->sc_akeylen;
618 cria.cri_key = sc->sc_akey;
619 crie.cri_next = &cria;
620 }
621
622 threads = g_eli_threads;
623 if (threads == 0)
624 threads = mp_ncpus;
625 else if (threads > mp_ncpus) {
626 /* There is really no need for too many worker threads. */
627 threads = mp_ncpus;
628 G_ELI_DEBUG(0, "Reducing number of threads to %u.", threads);
629 }
630 for (i = 0; i < threads; i++) {
631 wr = malloc(sizeof(*wr), M_ELI, M_WAITOK | M_ZERO);
632 wr->w_softc = sc;
633 wr->w_number = i;
634
635 /*
636 * If this is the first pass, try to get hardware support.
637 * Use software cryptography, if we cannot get it.
638 */
639 if (i == 0) {
640 error = crypto_newsession(&wr->w_sid, &crie, 1);
641 if (error == 0)
642 sc->sc_crypto = G_ELI_CRYPTO_HW;
643 }
644 if (sc->sc_crypto == G_ELI_CRYPTO_SW)
645 error = crypto_newsession(&wr->w_sid, &crie, 0);
646 if (error != 0) {
647 free(wr, M_ELI);
648 if (req != NULL) {
649 gctl_error(req, "Cannot set up crypto session "
650 "for %s (error=%d).", bpp->name, error);
651 } else {
652 G_ELI_DEBUG(1, "Cannot set up crypto session "
653 "for %s (error=%d).", bpp->name, error);
654 }
655 goto failed;
656 }
657
658 error = kthread_create(g_eli_worker, wr, &wr->w_proc, 0, 0,
659 "g_eli[%u] %s", i, bpp->name);
660 if (error != 0) {
661 crypto_freesession(wr->w_sid);
662 free(wr, M_ELI);
663 if (req != NULL) {
664 gctl_error(req, "Cannot create kernel thread "
665 "for %s (error=%d).", bpp->name, error);
666 } else {
667 G_ELI_DEBUG(1, "Cannot create kernel thread "
668 "for %s (error=%d).", bpp->name, error);
669 }
670 goto failed;
671 }
672 LIST_INSERT_HEAD(&sc->sc_workers, wr, w_next);
673 /* If we have hardware support, one thread is enough. */
674 if (sc->sc_crypto == G_ELI_CRYPTO_HW)
675 break;
676 }
677
678 /*
679 * Create decrypted provider.
680 */
681 pp = g_new_providerf(gp, "%s%s", bpp->name, G_ELI_SUFFIX);
682 pp->sectorsize = md->md_sectorsize;
683 pp->mediasize = bpp->mediasize;
684 if (!(sc->sc_flags & G_ELI_FLAG_ONETIME))
685 pp->mediasize -= bpp->sectorsize;
686 if (!(sc->sc_flags & G_ELI_FLAG_AUTH))
687 pp->mediasize -= (pp->mediasize % pp->sectorsize);
688 else {
689 pp->mediasize /= sc->sc_bytes_per_sector;
690 pp->mediasize *= pp->sectorsize;
691 }
692
693 g_error_provider(pp, 0);
694
695 G_ELI_DEBUG(0, "Device %s created.", pp->name);
696 G_ELI_DEBUG(0, "Encryption: %s %u", g_eli_algo2str(sc->sc_ealgo),
697 sc->sc_ekeylen);
698 if (sc->sc_flags & G_ELI_FLAG_AUTH)
699 G_ELI_DEBUG(0, " Integrity: %s", g_eli_algo2str(sc->sc_aalgo));
700 G_ELI_DEBUG(0, " Crypto: %s",
701 sc->sc_crypto == G_ELI_CRYPTO_SW ? "software" : "hardware");
702 return (gp);
703failed:
704 mtx_lock(&sc->sc_queue_mtx);
705 sc->sc_flags |= G_ELI_FLAG_DESTROY;
706 wakeup(sc);
707 /*
708 * Wait for kernel threads self destruction.
709 */
710 while (!LIST_EMPTY(&sc->sc_workers)) {
711 msleep(&sc->sc_workers, &sc->sc_queue_mtx, PRIBIO,
712 "geli:destroy", 0);
713 }
714 mtx_destroy(&sc->sc_queue_mtx);
715 if (cp->provider != NULL) {
716 if (cp->acr == 1)
717 g_access(cp, -1, -1, -1);
718 g_detach(cp);
719 }
720 g_destroy_consumer(cp);
721 g_destroy_geom(gp);
722 bzero(sc, sizeof(*sc));
723 free(sc, M_ELI);
724 return (NULL);
725}
726
727int
728g_eli_destroy(struct g_eli_softc *sc, boolean_t force)
729{
730 struct g_geom *gp;
731 struct g_provider *pp;
732
733 g_topology_assert();
734
735 if (sc == NULL)
736 return (ENXIO);
737
738 gp = sc->sc_geom;
739 pp = LIST_FIRST(&gp->provider);
740 if (pp != NULL && (pp->acr != 0 || pp->acw != 0 || pp->ace != 0)) {
741 if (force) {
742 G_ELI_DEBUG(1, "Device %s is still open, so it "
743 "cannot be definitely removed.", pp->name);
744 } else {
745 G_ELI_DEBUG(1,
746 "Device %s is still open (r%dw%de%d).", pp->name,
747 pp->acr, pp->acw, pp->ace);
748 return (EBUSY);
749 }
750 }
751
752 mtx_lock(&sc->sc_queue_mtx);
753 sc->sc_flags |= G_ELI_FLAG_DESTROY;
754 wakeup(sc);
755 while (!LIST_EMPTY(&sc->sc_workers)) {
756 msleep(&sc->sc_workers, &sc->sc_queue_mtx, PRIBIO,
757 "geli:destroy", 0);
758 }
759 mtx_destroy(&sc->sc_queue_mtx);
760 gp->softc = NULL;
761 bzero(sc, sizeof(*sc));
762 free(sc, M_ELI);
763
764 if (pp == NULL || (pp->acr == 0 && pp->acw == 0 && pp->ace == 0))
765 G_ELI_DEBUG(0, "Device %s destroyed.", gp->name);
766 g_wither_geom_close(gp, ENXIO);
767
768 return (0);
769}
770
771static int
772g_eli_destroy_geom(struct gctl_req *req __unused,
773 struct g_class *mp __unused, struct g_geom *gp)
774{
775 struct g_eli_softc *sc;
776
777 sc = gp->softc;
778 return (g_eli_destroy(sc, 0));
779}
780
781static int
782g_eli_keyfiles_load(struct hmac_ctx *ctx, const char *provider)
783{
784 u_char *keyfile, *data, *size;
785 char *file, name[64];
786 int i;
787
788 for (i = 0; ; i++) {
789 snprintf(name, sizeof(name), "%s:geli_keyfile%d", provider, i);
790 keyfile = preload_search_by_type(name);
791 if (keyfile == NULL)
792 return (i); /* Return number of loaded keyfiles. */
793 data = preload_search_info(keyfile, MODINFO_ADDR);
794 if (data == NULL) {
795 G_ELI_DEBUG(0, "Cannot find key file data for %s.",
796 name);
797 return (0);
798 }
799 data = *(void **)data;
800 size = preload_search_info(keyfile, MODINFO_SIZE);
801 if (size == NULL) {
802 G_ELI_DEBUG(0, "Cannot find key file size for %s.",
803 name);
804 return (0);
805 }
806 file = preload_search_info(keyfile, MODINFO_NAME);
807 if (file == NULL) {
808 G_ELI_DEBUG(0, "Cannot find key file name for %s.",
809 name);
810 return (0);
811 }
812 G_ELI_DEBUG(1, "Loaded keyfile %s for %s (type: %s).", file,
813 provider, name);
814 g_eli_crypto_hmac_update(ctx, data, *(size_t *)size);
815 }
816}
817
818static void
819g_eli_keyfiles_clear(const char *provider)
820{
821 u_char *keyfile, *data, *size;
822 char name[64];
823 int i;
824
825 for (i = 0; ; i++) {
826 snprintf(name, sizeof(name), "%s:geli_keyfile%d", provider, i);
827 keyfile = preload_search_by_type(name);
828 if (keyfile == NULL)
829 return;
830 data = preload_search_info(keyfile, MODINFO_ADDR);
831 size = preload_search_info(keyfile, MODINFO_SIZE);
832 if (data == NULL || size == NULL)
833 continue;
834 data = *(void **)data;
835 bzero(data, *(size_t *)size);
836 }
837}
838
839/*
840 * Tasting is only made on boot.
841 * We detect providers which should be attached before root is mounted.
842 */
843static struct g_geom *
844g_eli_taste(struct g_class *mp, struct g_provider *pp, int flags __unused)
845{
846 struct g_eli_metadata md;
847 struct g_geom *gp;
848 struct hmac_ctx ctx;
849 char passphrase[256];
850 u_char key[G_ELI_USERKEYLEN], mkey[G_ELI_DATAIVKEYLEN];
851 u_int i, nkey, nkeyfiles, tries;
852 int error;
853
854 g_trace(G_T_TOPOLOGY, "%s(%s, %s)", __func__, mp->name, pp->name);
855 g_topology_assert();
856
857 if (rootvnode != NULL || g_eli_tries == 0)
858 return (NULL);
859
860 G_ELI_DEBUG(3, "Tasting %s.", pp->name);
861
862 error = g_eli_read_metadata(mp, pp, &md);
863 if (error != 0)
864 return (NULL);
865 gp = NULL;
866
867 if (strcmp(md.md_magic, G_ELI_MAGIC) != 0)
868 return (NULL);
869 if (md.md_version > G_ELI_VERSION) {
870 printf("geom_eli.ko module is too old to handle %s.\n",
871 pp->name);
872 return (NULL);
873 }
874 if (md.md_provsize != pp->mediasize)
875 return (NULL);
876 /* Should we attach it on boot? */
877 if (!(md.md_flags & G_ELI_FLAG_BOOT))
878 return (NULL);
879 if (md.md_keys == 0x00) {
880 G_ELI_DEBUG(0, "No valid keys on %s.", pp->name);
881 return (NULL);
882 }
883 if (md.md_iterations == -1) {
884 /* If there is no passphrase, we try only once. */
885 tries = 1;
886 } else {
887 /* Ask for the passphrase no more than g_eli_tries times. */
888 tries = g_eli_tries;
889 }
890
891 for (i = 0; i < tries; i++) {
892 g_eli_crypto_hmac_init(&ctx, NULL, 0);
893
894 /*
895 * Load all key files.
896 */
897 nkeyfiles = g_eli_keyfiles_load(&ctx, pp->name);
898
899 if (nkeyfiles == 0 && md.md_iterations == -1) {
900 /*
901 * No key files and no passphrase, something is
902 * definitely wrong here.
903 * geli(8) doesn't allow for such situation, so assume
904 * that there was really no passphrase and in that case
905 * key files are no properly defined in loader.conf.
906 */
907 G_ELI_DEBUG(0,
908 "Found no key files in loader.conf for %s.",
909 pp->name);
910 return (NULL);
911 }
912
913 /* Ask for the passphrase if defined. */
914 if (md.md_iterations >= 0) {
915 printf("Enter passphrase for %s: ", pp->name);
916 gets(passphrase, sizeof(passphrase),
917 g_eli_visible_passphrase);
918 }
919
920 /*
921 * Prepare Derived-Key from the user passphrase.
922 */
923 if (md.md_iterations == 0) {
924 g_eli_crypto_hmac_update(&ctx, md.md_salt,
925 sizeof(md.md_salt));
926 g_eli_crypto_hmac_update(&ctx, passphrase,
927 strlen(passphrase));
928 } else if (md.md_iterations > 0) {
929 u_char dkey[G_ELI_USERKEYLEN];
930
931 pkcs5v2_genkey(dkey, sizeof(dkey), md.md_salt,
932 sizeof(md.md_salt), passphrase, md.md_iterations);
933 g_eli_crypto_hmac_update(&ctx, dkey, sizeof(dkey));
934 bzero(dkey, sizeof(dkey));
935 }
936
937 g_eli_crypto_hmac_final(&ctx, key, 0);
938
939 /*
940 * Decrypt Master-Key.
941 */
942 error = g_eli_mkey_decrypt(&md, key, mkey, &nkey);
943 bzero(key, sizeof(key));
944 if (error == -1) {
945 if (i == tries - 1) {
946 G_ELI_DEBUG(0,
947 "Wrong key for %s. No tries left.",
948 pp->name);
949 g_eli_keyfiles_clear(pp->name);
950 return (NULL);
951 }
952 G_ELI_DEBUG(0, "Wrong key for %s. Tries left: %u.",
953 pp->name, tries - i - 1);
954 /* Try again. */
955 continue;
956 } else if (error > 0) {
957 G_ELI_DEBUG(0, "Cannot decrypt Master Key for %s (error=%d).",
958 pp->name, error);
959 g_eli_keyfiles_clear(pp->name);
960 return (NULL);
961 }
962 G_ELI_DEBUG(1, "Using Master Key %u for %s.", nkey, pp->name);
963 break;
964 }
965
966 /*
967 * We have correct key, let's attach provider.
968 */
969 gp = g_eli_create(NULL, mp, pp, &md, mkey, nkey);
970 bzero(mkey, sizeof(mkey));
971 bzero(&md, sizeof(md));
972 if (gp == NULL) {
973 G_ELI_DEBUG(0, "Cannot create device %s%s.", pp->name,
974 G_ELI_SUFFIX);
975 return (NULL);
976 }
977 return (gp);
978}
979
980static void
981g_eli_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp,
982 struct g_consumer *cp, struct g_provider *pp)
983{
984 struct g_eli_softc *sc;
985
986 g_topology_assert();
987 sc = gp->softc;
988 if (sc == NULL)
989 return;
990 if (pp != NULL || cp != NULL)
991 return; /* Nothing here. */
992 sbuf_printf(sb, "%s<Flags>", indent);
993 if (sc->sc_flags == 0)
994 sbuf_printf(sb, "NONE");
995 else {
996 int first = 1;
997
998#define ADD_FLAG(flag, name) do { \
999 if (sc->sc_flags & (flag)) { \
1000 if (!first) \
1001 sbuf_printf(sb, ", "); \
1002 else \
1003 first = 0; \
1004 sbuf_printf(sb, name); \
1005 } \
1006} while (0)
1007 ADD_FLAG(G_ELI_FLAG_NATIVE_BYTE_ORDER, "NATIVE-BYTE-ORDER");
1008 ADD_FLAG(G_ELI_FLAG_ONETIME, "ONETIME");
1009 ADD_FLAG(G_ELI_FLAG_BOOT, "BOOT");
1010 ADD_FLAG(G_ELI_FLAG_WO_DETACH, "W-DETACH");
1011 ADD_FLAG(G_ELI_FLAG_RW_DETACH, "RW-DETACH");
1012 ADD_FLAG(G_ELI_FLAG_AUTH, "AUTH");
1013 ADD_FLAG(G_ELI_FLAG_WOPEN, "W-OPEN");
1014 ADD_FLAG(G_ELI_FLAG_DESTROY, "DESTROY");
1015 ADD_FLAG(G_ELI_FLAG_RO, "READ-ONLY");
1016#undef ADD_FLAG
1017 }
1018 sbuf_printf(sb, "</Flags>\n");
1019
1020 if (!(sc->sc_flags & G_ELI_FLAG_ONETIME)) {
1021 sbuf_printf(sb, "%s<UsedKey>%u</UsedKey>\n", indent,
1022 sc->sc_nkey);
1023 }
1024 sbuf_printf(sb, "%s<Crypto>", indent);
1025 switch (sc->sc_crypto) {
1026 case G_ELI_CRYPTO_HW:
1027 sbuf_printf(sb, "hardware");
1028 break;
1029 case G_ELI_CRYPTO_SW:
1030 sbuf_printf(sb, "software");
1031 break;
1032 default:
1033 sbuf_printf(sb, "UNKNOWN");
1034 break;
1035 }
1036 sbuf_printf(sb, "</Crypto>\n");
1037 if (sc->sc_flags & G_ELI_FLAG_AUTH) {
1038 sbuf_printf(sb,
1039 "%s<AuthenticationAlgorithm>%s</AuthenticationAlgorithm>\n",
1040 indent, g_eli_algo2str(sc->sc_aalgo));
1041 }
1042 sbuf_printf(sb, "%s<KeyLength>%u</KeyLength>\n", indent,
1043 sc->sc_ekeylen);
1044 sbuf_printf(sb, "%s<EncryptionAlgorithm>%s</EncryptionAlgorithm>\n", indent,
1045 g_eli_algo2str(sc->sc_ealgo));
1046}
1047
1048DECLARE_GEOM_CLASS(g_eli_class, g_eli);
1049MODULE_DEPEND(g_eli, crypto, 1, 1, 1);
| 269 g_io_deliver(bp, EOPNOTSUPP);
270 return;
271 }
272 cbp = g_clone_bio(bp);
273 if (cbp == NULL) {
274 g_io_deliver(bp, ENOMEM);
275 return;
276 }
277 switch (bp->bio_cmd) {
278 case BIO_READ:
279 if (!(sc->sc_flags & G_ELI_FLAG_AUTH)) {
280 bp->bio_driver2 = NULL;
281 cbp->bio_done = g_eli_read_done;
282 cp = LIST_FIRST(&sc->sc_geom->consumer);
283 cbp->bio_to = cp->provider;
284 G_ELI_LOGREQ(2, cbp, "Sending request.");
285 /*
286 * Read encrypted data from provider.
287 */
288 g_io_request(cbp, cp);
289 break;
290 }
291 bp->bio_pflags = 255;
292 /* FALLTHROUGH */
293 case BIO_WRITE:
294 bp->bio_driver1 = cbp;
295 mtx_lock(&sc->sc_queue_mtx);
296 bioq_insert_tail(&sc->sc_queue, bp);
297 mtx_unlock(&sc->sc_queue_mtx);
298 wakeup(sc);
299 break;
300 case BIO_GETATTR:
301 cbp->bio_done = g_std_done;
302 cp = LIST_FIRST(&sc->sc_geom->consumer);
303 cbp->bio_to = cp->provider;
304 G_ELI_LOGREQ(2, cbp, "Sending request.");
305 g_io_request(cbp, cp);
306 break;
307 }
308}
309
310/*
311 * This is the main function for kernel worker thread when we don't have
312 * hardware acceleration and we have to do cryptography in software.
313 * Dedicated thread is needed, so we don't slow down g_up/g_down GEOM
314 * threads with crypto work.
315 */
316static void
317g_eli_worker(void *arg)
318{
319 struct g_eli_softc *sc;
320 struct g_eli_worker *wr;
321 struct bio *bp;
322
323 wr = arg;
324 sc = wr->w_softc;
325 mtx_lock_spin(&sched_lock);
326 sched_prio(curthread, PRIBIO);
327 if (sc->sc_crypto == G_ELI_CRYPTO_SW && g_eli_threads == 0)
328 sched_bind(curthread, wr->w_number);
329 mtx_unlock_spin(&sched_lock);
330
331 G_ELI_DEBUG(1, "Thread %s started.", curthread->td_proc->p_comm);
332
333 for (;;) {
334 mtx_lock(&sc->sc_queue_mtx);
335 bp = bioq_takefirst(&sc->sc_queue);
336 if (bp == NULL) {
337 if (sc->sc_flags & G_ELI_FLAG_DESTROY) {
338 LIST_REMOVE(wr, w_next);
339 crypto_freesession(wr->w_sid);
340 free(wr, M_ELI);
341 G_ELI_DEBUG(1, "Thread %s exiting.",
342 curthread->td_proc->p_comm);
343 wakeup(&sc->sc_workers);
344 mtx_unlock(&sc->sc_queue_mtx);
345 kthread_exit(0);
346 }
347 msleep(sc, &sc->sc_queue_mtx, PRIBIO | PDROP,
348 "geli:w", 0);
349 continue;
350 }
351 mtx_unlock(&sc->sc_queue_mtx);
352 if (bp->bio_cmd == BIO_READ && bp->bio_pflags == 255)
353 g_eli_auth_read(sc, bp);
354 else if (sc->sc_flags & G_ELI_FLAG_AUTH)
355 g_eli_auth_run(wr, bp);
356 else
357 g_eli_crypto_run(wr, bp);
358 }
359}
360
361/*
362 * Here we generate IV. It is unique for every sector.
363 */
364void
365g_eli_crypto_ivgen(struct g_eli_softc *sc, off_t offset, u_char *iv,
366 size_t size)
367{
368 u_char off[8], hash[SHA256_DIGEST_LENGTH];
369 SHA256_CTX ctx;
370
371 if (!(sc->sc_flags & G_ELI_FLAG_NATIVE_BYTE_ORDER))
372 le64enc(off, (uint64_t)offset);
373 /* Copy precalculated SHA256 context for IV-Key. */
374 bcopy(&sc->sc_ivctx, &ctx, sizeof(ctx));
375 SHA256_Update(&ctx, (uint8_t *)&offset, sizeof(offset));
376 SHA256_Final(hash, &ctx);
377 bcopy(hash, iv, size);
378}
379
380int
381g_eli_read_metadata(struct g_class *mp, struct g_provider *pp,
382 struct g_eli_metadata *md)
383{
384 struct g_geom *gp;
385 struct g_consumer *cp;
386 u_char *buf = NULL;
387 int error;
388
389 g_topology_assert();
390
391 gp = g_new_geomf(mp, "eli:taste");
392 gp->start = g_eli_start;
393 gp->access = g_std_access;
394 /*
395 * g_eli_read_metadata() is always called from the event thread.
396 * Our geom is created and destroyed in the same event, so there
397 * could be no orphan nor spoil event in the meantime.
398 */
399 gp->orphan = g_eli_orphan_spoil_assert;
400 gp->spoiled = g_eli_orphan_spoil_assert;
401 cp = g_new_consumer(gp);
402 error = g_attach(cp, pp);
403 if (error != 0)
404 goto end;
405 error = g_access(cp, 1, 0, 0);
406 if (error != 0)
407 goto end;
408 g_topology_unlock();
409 buf = g_read_data(cp, pp->mediasize - pp->sectorsize, pp->sectorsize,
410 &error);
411 g_topology_lock();
412 if (buf == NULL)
413 goto end;
414 eli_metadata_decode(buf, md);
415end:
416 if (buf != NULL)
417 g_free(buf);
418 if (cp->provider != NULL) {
419 if (cp->acr == 1)
420 g_access(cp, -1, 0, 0);
421 g_detach(cp);
422 }
423 g_destroy_consumer(cp);
424 g_destroy_geom(gp);
425 return (error);
426}
427
428/*
429 * The function is called when we had last close on provider and user requested
430 * to close it when this situation occur.
431 */
432static void
433g_eli_last_close(struct g_eli_softc *sc)
434{
435 struct g_geom *gp;
436 struct g_provider *pp;
437 char ppname[64];
438 int error;
439
440 g_topology_assert();
441 gp = sc->sc_geom;
442 pp = LIST_FIRST(&gp->provider);
443 strlcpy(ppname, pp->name, sizeof(ppname));
444 error = g_eli_destroy(sc, 1);
445 KASSERT(error == 0, ("Cannot detach %s on last close (error=%d).",
446 ppname, error));
447 G_ELI_DEBUG(0, "Detached %s on last close.", ppname);
448}
449
450int
451g_eli_access(struct g_provider *pp, int dr, int dw, int de)
452{
453 struct g_eli_softc *sc;
454 struct g_geom *gp;
455
456 gp = pp->geom;
457 sc = gp->softc;
458
459 if (dw > 0) {
460 if (sc->sc_flags & G_ELI_FLAG_RO) {
461 /* Deny write attempts. */
462 return (EROFS);
463 }
464 /* Someone is opening us for write, we need to remember that. */
465 sc->sc_flags |= G_ELI_FLAG_WOPEN;
466 return (0);
467 }
468 /* Is this the last close? */
469 if (pp->acr + dr > 0 || pp->acw + dw > 0 || pp->ace + de > 0)
470 return (0);
471
472 /*
473 * Automatically detach on last close if requested.
474 */
475 if ((sc->sc_flags & G_ELI_FLAG_RW_DETACH) ||
476 (sc->sc_flags & G_ELI_FLAG_WOPEN)) {
477 g_eli_last_close(sc);
478 }
479 return (0);
480}
481
482struct g_geom *
483g_eli_create(struct gctl_req *req, struct g_class *mp, struct g_provider *bpp,
484 const struct g_eli_metadata *md, const u_char *mkey, int nkey)
485{
486 struct g_eli_softc *sc;
487 struct g_eli_worker *wr;
488 struct g_geom *gp;
489 struct g_provider *pp;
490 struct g_consumer *cp;
491 struct cryptoini crie, cria;
492 u_int i, threads;
493 int error;
494
495 G_ELI_DEBUG(1, "Creating device %s%s.", bpp->name, G_ELI_SUFFIX);
496
497 gp = g_new_geomf(mp, "%s%s", bpp->name, G_ELI_SUFFIX);
498 gp->softc = NULL; /* for a moment */
499
500 sc = malloc(sizeof(*sc), M_ELI, M_WAITOK | M_ZERO);
501 gp->start = g_eli_start;
502 /*
503 * Spoiling cannot happen actually, because we keep provider open for
504 * writing all the time or provider is read-only.
505 */
506 gp->spoiled = g_eli_orphan_spoil_assert;
507 gp->orphan = g_eli_orphan;
508 gp->dumpconf = g_eli_dumpconf;
509 /*
510 * If detach-on-last-close feature is not enabled and we don't operate
511 * on read-only provider, we can simply use g_std_access().
512 */
513 if (md->md_flags & (G_ELI_FLAG_WO_DETACH | G_ELI_FLAG_RO))
514 gp->access = g_eli_access;
515 else
516 gp->access = g_std_access;
517
518 sc->sc_crypto = G_ELI_CRYPTO_SW;
519 sc->sc_flags = md->md_flags;
520 /* Backward compatibility. */
521 if (md->md_version < 2)
522 sc->sc_flags |= G_ELI_FLAG_NATIVE_BYTE_ORDER;
523 sc->sc_ealgo = md->md_ealgo;
524 sc->sc_nkey = nkey;
525 /*
526 * Remember the keys in our softc structure.
527 */
528 g_eli_mkey_propagate(sc, mkey);
529 sc->sc_ekeylen = md->md_keylen;
530
531 if (sc->sc_flags & G_ELI_FLAG_AUTH) {
532 sc->sc_akeylen = sizeof(sc->sc_akey) * 8;
533 sc->sc_aalgo = md->md_aalgo;
534 sc->sc_alen = g_eli_hashlen(sc->sc_aalgo);
535
536 sc->sc_data_per_sector = bpp->sectorsize - sc->sc_alen;
537 /*
538 * Some hash functions (like SHA1 and RIPEMD160) generates hash
539 * which length is not multiple of 128 bits, but we want data
540 * length to be multiple of 128, so we can encrypt without
541 * padding. The line below rounds down data length to multiple
542 * of 128 bits.
543 */
544 sc->sc_data_per_sector -= sc->sc_data_per_sector % 16;
545
546 sc->sc_bytes_per_sector =
547 (md->md_sectorsize - 1) / sc->sc_data_per_sector + 1;
548 sc->sc_bytes_per_sector *= bpp->sectorsize;
549 /*
550 * Precalculate SHA256 for HMAC key generation.
551 * This is expensive operation and we can do it only once now or
552 * for every access to sector, so now will be much better.
553 */
554 SHA256_Init(&sc->sc_akeyctx);
555 SHA256_Update(&sc->sc_akeyctx, sc->sc_akey,
556 sizeof(sc->sc_akey));
557 }
558
559 /*
560 * Precalculate SHA256 for IV generation.
561 * This is expensive operation and we can do it only once now or for
562 * every access to sector, so now will be much better.
563 */
564 SHA256_Init(&sc->sc_ivctx);
565 SHA256_Update(&sc->sc_ivctx, sc->sc_ivkey, sizeof(sc->sc_ivkey));
566
567 gp->softc = sc;
568 sc->sc_geom = gp;
569
570 bioq_init(&sc->sc_queue);
571 mtx_init(&sc->sc_queue_mtx, "geli:queue", NULL, MTX_DEF);
572
573 pp = NULL;
574 cp = g_new_consumer(gp);
575 error = g_attach(cp, bpp);
576 if (error != 0) {
577 if (req != NULL) {
578 gctl_error(req, "Cannot attach to %s (error=%d).",
579 bpp->name, error);
580 } else {
581 G_ELI_DEBUG(1, "Cannot attach to %s (error=%d).",
582 bpp->name, error);
583 }
584 goto failed;
585 }
586 /*
587 * Keep provider open all the time, so we can run critical tasks,
588 * like Master Keys deletion, without wondering if we can open
589 * provider or not.
590 * We don't open provider for writing only when user requested read-only
591 * access.
592 */
593 if (sc->sc_flags & G_ELI_FLAG_RO)
594 error = g_access(cp, 1, 0, 1);
595 else
596 error = g_access(cp, 1, 1, 1);
597 if (error != 0) {
598 if (req != NULL) {
599 gctl_error(req, "Cannot access %s (error=%d).",
600 bpp->name, error);
601 } else {
602 G_ELI_DEBUG(1, "Cannot access %s (error=%d).",
603 bpp->name, error);
604 }
605 goto failed;
606 }
607
608 LIST_INIT(&sc->sc_workers);
609
610 bzero(&crie, sizeof(crie));
611 crie.cri_alg = sc->sc_ealgo;
612 crie.cri_klen = sc->sc_ekeylen;
613 crie.cri_key = sc->sc_ekey;
614 if (sc->sc_flags & G_ELI_FLAG_AUTH) {
615 bzero(&cria, sizeof(cria));
616 cria.cri_alg = sc->sc_aalgo;
617 cria.cri_klen = sc->sc_akeylen;
618 cria.cri_key = sc->sc_akey;
619 crie.cri_next = &cria;
620 }
621
622 threads = g_eli_threads;
623 if (threads == 0)
624 threads = mp_ncpus;
625 else if (threads > mp_ncpus) {
626 /* There is really no need for too many worker threads. */
627 threads = mp_ncpus;
628 G_ELI_DEBUG(0, "Reducing number of threads to %u.", threads);
629 }
630 for (i = 0; i < threads; i++) {
631 wr = malloc(sizeof(*wr), M_ELI, M_WAITOK | M_ZERO);
632 wr->w_softc = sc;
633 wr->w_number = i;
634
635 /*
636 * If this is the first pass, try to get hardware support.
637 * Use software cryptography, if we cannot get it.
638 */
639 if (i == 0) {
640 error = crypto_newsession(&wr->w_sid, &crie, 1);
641 if (error == 0)
642 sc->sc_crypto = G_ELI_CRYPTO_HW;
643 }
644 if (sc->sc_crypto == G_ELI_CRYPTO_SW)
645 error = crypto_newsession(&wr->w_sid, &crie, 0);
646 if (error != 0) {
647 free(wr, M_ELI);
648 if (req != NULL) {
649 gctl_error(req, "Cannot set up crypto session "
650 "for %s (error=%d).", bpp->name, error);
651 } else {
652 G_ELI_DEBUG(1, "Cannot set up crypto session "
653 "for %s (error=%d).", bpp->name, error);
654 }
655 goto failed;
656 }
657
658 error = kthread_create(g_eli_worker, wr, &wr->w_proc, 0, 0,
659 "g_eli[%u] %s", i, bpp->name);
660 if (error != 0) {
661 crypto_freesession(wr->w_sid);
662 free(wr, M_ELI);
663 if (req != NULL) {
664 gctl_error(req, "Cannot create kernel thread "
665 "for %s (error=%d).", bpp->name, error);
666 } else {
667 G_ELI_DEBUG(1, "Cannot create kernel thread "
668 "for %s (error=%d).", bpp->name, error);
669 }
670 goto failed;
671 }
672 LIST_INSERT_HEAD(&sc->sc_workers, wr, w_next);
673 /* If we have hardware support, one thread is enough. */
674 if (sc->sc_crypto == G_ELI_CRYPTO_HW)
675 break;
676 }
677
678 /*
679 * Create decrypted provider.
680 */
681 pp = g_new_providerf(gp, "%s%s", bpp->name, G_ELI_SUFFIX);
682 pp->sectorsize = md->md_sectorsize;
683 pp->mediasize = bpp->mediasize;
684 if (!(sc->sc_flags & G_ELI_FLAG_ONETIME))
685 pp->mediasize -= bpp->sectorsize;
686 if (!(sc->sc_flags & G_ELI_FLAG_AUTH))
687 pp->mediasize -= (pp->mediasize % pp->sectorsize);
688 else {
689 pp->mediasize /= sc->sc_bytes_per_sector;
690 pp->mediasize *= pp->sectorsize;
691 }
692
693 g_error_provider(pp, 0);
694
695 G_ELI_DEBUG(0, "Device %s created.", pp->name);
696 G_ELI_DEBUG(0, "Encryption: %s %u", g_eli_algo2str(sc->sc_ealgo),
697 sc->sc_ekeylen);
698 if (sc->sc_flags & G_ELI_FLAG_AUTH)
699 G_ELI_DEBUG(0, " Integrity: %s", g_eli_algo2str(sc->sc_aalgo));
700 G_ELI_DEBUG(0, " Crypto: %s",
701 sc->sc_crypto == G_ELI_CRYPTO_SW ? "software" : "hardware");
702 return (gp);
703failed:
704 mtx_lock(&sc->sc_queue_mtx);
705 sc->sc_flags |= G_ELI_FLAG_DESTROY;
706 wakeup(sc);
707 /*
708 * Wait for kernel threads self destruction.
709 */
710 while (!LIST_EMPTY(&sc->sc_workers)) {
711 msleep(&sc->sc_workers, &sc->sc_queue_mtx, PRIBIO,
712 "geli:destroy", 0);
713 }
714 mtx_destroy(&sc->sc_queue_mtx);
715 if (cp->provider != NULL) {
716 if (cp->acr == 1)
717 g_access(cp, -1, -1, -1);
718 g_detach(cp);
719 }
720 g_destroy_consumer(cp);
721 g_destroy_geom(gp);
722 bzero(sc, sizeof(*sc));
723 free(sc, M_ELI);
724 return (NULL);
725}
726
727int
728g_eli_destroy(struct g_eli_softc *sc, boolean_t force)
729{
730 struct g_geom *gp;
731 struct g_provider *pp;
732
733 g_topology_assert();
734
735 if (sc == NULL)
736 return (ENXIO);
737
738 gp = sc->sc_geom;
739 pp = LIST_FIRST(&gp->provider);
740 if (pp != NULL && (pp->acr != 0 || pp->acw != 0 || pp->ace != 0)) {
741 if (force) {
742 G_ELI_DEBUG(1, "Device %s is still open, so it "
743 "cannot be definitely removed.", pp->name);
744 } else {
745 G_ELI_DEBUG(1,
746 "Device %s is still open (r%dw%de%d).", pp->name,
747 pp->acr, pp->acw, pp->ace);
748 return (EBUSY);
749 }
750 }
751
752 mtx_lock(&sc->sc_queue_mtx);
753 sc->sc_flags |= G_ELI_FLAG_DESTROY;
754 wakeup(sc);
755 while (!LIST_EMPTY(&sc->sc_workers)) {
756 msleep(&sc->sc_workers, &sc->sc_queue_mtx, PRIBIO,
757 "geli:destroy", 0);
758 }
759 mtx_destroy(&sc->sc_queue_mtx);
760 gp->softc = NULL;
761 bzero(sc, sizeof(*sc));
762 free(sc, M_ELI);
763
764 if (pp == NULL || (pp->acr == 0 && pp->acw == 0 && pp->ace == 0))
765 G_ELI_DEBUG(0, "Device %s destroyed.", gp->name);
766 g_wither_geom_close(gp, ENXIO);
767
768 return (0);
769}
770
771static int
772g_eli_destroy_geom(struct gctl_req *req __unused,
773 struct g_class *mp __unused, struct g_geom *gp)
774{
775 struct g_eli_softc *sc;
776
777 sc = gp->softc;
778 return (g_eli_destroy(sc, 0));
779}
780
781static int
782g_eli_keyfiles_load(struct hmac_ctx *ctx, const char *provider)
783{
784 u_char *keyfile, *data, *size;
785 char *file, name[64];
786 int i;
787
788 for (i = 0; ; i++) {
789 snprintf(name, sizeof(name), "%s:geli_keyfile%d", provider, i);
790 keyfile = preload_search_by_type(name);
791 if (keyfile == NULL)
792 return (i); /* Return number of loaded keyfiles. */
793 data = preload_search_info(keyfile, MODINFO_ADDR);
794 if (data == NULL) {
795 G_ELI_DEBUG(0, "Cannot find key file data for %s.",
796 name);
797 return (0);
798 }
799 data = *(void **)data;
800 size = preload_search_info(keyfile, MODINFO_SIZE);
801 if (size == NULL) {
802 G_ELI_DEBUG(0, "Cannot find key file size for %s.",
803 name);
804 return (0);
805 }
806 file = preload_search_info(keyfile, MODINFO_NAME);
807 if (file == NULL) {
808 G_ELI_DEBUG(0, "Cannot find key file name for %s.",
809 name);
810 return (0);
811 }
812 G_ELI_DEBUG(1, "Loaded keyfile %s for %s (type: %s).", file,
813 provider, name);
814 g_eli_crypto_hmac_update(ctx, data, *(size_t *)size);
815 }
816}
817
818static void
819g_eli_keyfiles_clear(const char *provider)
820{
821 u_char *keyfile, *data, *size;
822 char name[64];
823 int i;
824
825 for (i = 0; ; i++) {
826 snprintf(name, sizeof(name), "%s:geli_keyfile%d", provider, i);
827 keyfile = preload_search_by_type(name);
828 if (keyfile == NULL)
829 return;
830 data = preload_search_info(keyfile, MODINFO_ADDR);
831 size = preload_search_info(keyfile, MODINFO_SIZE);
832 if (data == NULL || size == NULL)
833 continue;
834 data = *(void **)data;
835 bzero(data, *(size_t *)size);
836 }
837}
838
839/*
840 * Tasting is only made on boot.
841 * We detect providers which should be attached before root is mounted.
842 */
843static struct g_geom *
844g_eli_taste(struct g_class *mp, struct g_provider *pp, int flags __unused)
845{
846 struct g_eli_metadata md;
847 struct g_geom *gp;
848 struct hmac_ctx ctx;
849 char passphrase[256];
850 u_char key[G_ELI_USERKEYLEN], mkey[G_ELI_DATAIVKEYLEN];
851 u_int i, nkey, nkeyfiles, tries;
852 int error;
853
854 g_trace(G_T_TOPOLOGY, "%s(%s, %s)", __func__, mp->name, pp->name);
855 g_topology_assert();
856
857 if (rootvnode != NULL || g_eli_tries == 0)
858 return (NULL);
859
860 G_ELI_DEBUG(3, "Tasting %s.", pp->name);
861
862 error = g_eli_read_metadata(mp, pp, &md);
863 if (error != 0)
864 return (NULL);
865 gp = NULL;
866
867 if (strcmp(md.md_magic, G_ELI_MAGIC) != 0)
868 return (NULL);
869 if (md.md_version > G_ELI_VERSION) {
870 printf("geom_eli.ko module is too old to handle %s.\n",
871 pp->name);
872 return (NULL);
873 }
874 if (md.md_provsize != pp->mediasize)
875 return (NULL);
876 /* Should we attach it on boot? */
877 if (!(md.md_flags & G_ELI_FLAG_BOOT))
878 return (NULL);
879 if (md.md_keys == 0x00) {
880 G_ELI_DEBUG(0, "No valid keys on %s.", pp->name);
881 return (NULL);
882 }
883 if (md.md_iterations == -1) {
884 /* If there is no passphrase, we try only once. */
885 tries = 1;
886 } else {
887 /* Ask for the passphrase no more than g_eli_tries times. */
888 tries = g_eli_tries;
889 }
890
891 for (i = 0; i < tries; i++) {
892 g_eli_crypto_hmac_init(&ctx, NULL, 0);
893
894 /*
895 * Load all key files.
896 */
897 nkeyfiles = g_eli_keyfiles_load(&ctx, pp->name);
898
899 if (nkeyfiles == 0 && md.md_iterations == -1) {
900 /*
901 * No key files and no passphrase, something is
902 * definitely wrong here.
903 * geli(8) doesn't allow for such situation, so assume
904 * that there was really no passphrase and in that case
905 * key files are no properly defined in loader.conf.
906 */
907 G_ELI_DEBUG(0,
908 "Found no key files in loader.conf for %s.",
909 pp->name);
910 return (NULL);
911 }
912
913 /* Ask for the passphrase if defined. */
914 if (md.md_iterations >= 0) {
915 printf("Enter passphrase for %s: ", pp->name);
916 gets(passphrase, sizeof(passphrase),
917 g_eli_visible_passphrase);
918 }
919
920 /*
921 * Prepare Derived-Key from the user passphrase.
922 */
923 if (md.md_iterations == 0) {
924 g_eli_crypto_hmac_update(&ctx, md.md_salt,
925 sizeof(md.md_salt));
926 g_eli_crypto_hmac_update(&ctx, passphrase,
927 strlen(passphrase));
928 } else if (md.md_iterations > 0) {
929 u_char dkey[G_ELI_USERKEYLEN];
930
931 pkcs5v2_genkey(dkey, sizeof(dkey), md.md_salt,
932 sizeof(md.md_salt), passphrase, md.md_iterations);
933 g_eli_crypto_hmac_update(&ctx, dkey, sizeof(dkey));
934 bzero(dkey, sizeof(dkey));
935 }
936
937 g_eli_crypto_hmac_final(&ctx, key, 0);
938
939 /*
940 * Decrypt Master-Key.
941 */
942 error = g_eli_mkey_decrypt(&md, key, mkey, &nkey);
943 bzero(key, sizeof(key));
944 if (error == -1) {
945 if (i == tries - 1) {
946 G_ELI_DEBUG(0,
947 "Wrong key for %s. No tries left.",
948 pp->name);
949 g_eli_keyfiles_clear(pp->name);
950 return (NULL);
951 }
952 G_ELI_DEBUG(0, "Wrong key for %s. Tries left: %u.",
953 pp->name, tries - i - 1);
954 /* Try again. */
955 continue;
956 } else if (error > 0) {
957 G_ELI_DEBUG(0, "Cannot decrypt Master Key for %s (error=%d).",
958 pp->name, error);
959 g_eli_keyfiles_clear(pp->name);
960 return (NULL);
961 }
962 G_ELI_DEBUG(1, "Using Master Key %u for %s.", nkey, pp->name);
963 break;
964 }
965
966 /*
967 * We have correct key, let's attach provider.
968 */
969 gp = g_eli_create(NULL, mp, pp, &md, mkey, nkey);
970 bzero(mkey, sizeof(mkey));
971 bzero(&md, sizeof(md));
972 if (gp == NULL) {
973 G_ELI_DEBUG(0, "Cannot create device %s%s.", pp->name,
974 G_ELI_SUFFIX);
975 return (NULL);
976 }
977 return (gp);
978}
979
980static void
981g_eli_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp,
982 struct g_consumer *cp, struct g_provider *pp)
983{
984 struct g_eli_softc *sc;
985
986 g_topology_assert();
987 sc = gp->softc;
988 if (sc == NULL)
989 return;
990 if (pp != NULL || cp != NULL)
991 return; /* Nothing here. */
992 sbuf_printf(sb, "%s<Flags>", indent);
993 if (sc->sc_flags == 0)
994 sbuf_printf(sb, "NONE");
995 else {
996 int first = 1;
997
998#define ADD_FLAG(flag, name) do { \
999 if (sc->sc_flags & (flag)) { \
1000 if (!first) \
1001 sbuf_printf(sb, ", "); \
1002 else \
1003 first = 0; \
1004 sbuf_printf(sb, name); \
1005 } \
1006} while (0)
1007 ADD_FLAG(G_ELI_FLAG_NATIVE_BYTE_ORDER, "NATIVE-BYTE-ORDER");
1008 ADD_FLAG(G_ELI_FLAG_ONETIME, "ONETIME");
1009 ADD_FLAG(G_ELI_FLAG_BOOT, "BOOT");
1010 ADD_FLAG(G_ELI_FLAG_WO_DETACH, "W-DETACH");
1011 ADD_FLAG(G_ELI_FLAG_RW_DETACH, "RW-DETACH");
1012 ADD_FLAG(G_ELI_FLAG_AUTH, "AUTH");
1013 ADD_FLAG(G_ELI_FLAG_WOPEN, "W-OPEN");
1014 ADD_FLAG(G_ELI_FLAG_DESTROY, "DESTROY");
1015 ADD_FLAG(G_ELI_FLAG_RO, "READ-ONLY");
1016#undef ADD_FLAG
1017 }
1018 sbuf_printf(sb, "</Flags>\n");
1019
1020 if (!(sc->sc_flags & G_ELI_FLAG_ONETIME)) {
1021 sbuf_printf(sb, "%s<UsedKey>%u</UsedKey>\n", indent,
1022 sc->sc_nkey);
1023 }
1024 sbuf_printf(sb, "%s<Crypto>", indent);
1025 switch (sc->sc_crypto) {
1026 case G_ELI_CRYPTO_HW:
1027 sbuf_printf(sb, "hardware");
1028 break;
1029 case G_ELI_CRYPTO_SW:
1030 sbuf_printf(sb, "software");
1031 break;
1032 default:
1033 sbuf_printf(sb, "UNKNOWN");
1034 break;
1035 }
1036 sbuf_printf(sb, "</Crypto>\n");
1037 if (sc->sc_flags & G_ELI_FLAG_AUTH) {
1038 sbuf_printf(sb,
1039 "%s<AuthenticationAlgorithm>%s</AuthenticationAlgorithm>\n",
1040 indent, g_eli_algo2str(sc->sc_aalgo));
1041 }
1042 sbuf_printf(sb, "%s<KeyLength>%u</KeyLength>\n", indent,
1043 sc->sc_ekeylen);
1044 sbuf_printf(sb, "%s<EncryptionAlgorithm>%s</EncryptionAlgorithm>\n", indent,
1045 g_eli_algo2str(sc->sc_ealgo));
1046}
1047
1048DECLARE_GEOM_CLASS(g_eli_class, g_eli);
1049MODULE_DEPEND(g_eli, crypto, 1, 1, 1);
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