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freebsd-skq/sys/geom/eli/g_eli.c
oshogbo 53bbe84593 Hide length of geli passphrase during boot. 
Introduce additional flag to the geli which allows to restore previous
behavior.

Reviewed by:	AllanJude@, cem@ (previous version)
MFC:		1 month
Relnotes:	yes
Differential Revision:	https://reviews.freebsd.org/D11751
2017-08-26 14:07:24 +00:00

1321 lines
36 KiB
C
Raw Blame History

/*-
* Copyright (c) 2005-2011 Pawel Jakub Dawidek <pawel@dawidek.net>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/cons.h>
#include <sys/kernel.h>
#include <sys/linker.h>
#include <sys/module.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/bio.h>
#include <sys/sbuf.h>
#include <sys/sysctl.h>
#include <sys/malloc.h>
#include <sys/eventhandler.h>
#include <sys/kthread.h>
#include <sys/proc.h>
#include <sys/sched.h>
#include <sys/smp.h>
#include <sys/uio.h>
#include <sys/vnode.h>
#include <vm/uma.h>
#include <geom/geom.h>
#include <geom/eli/g_eli.h>
#include <geom/eli/pkcs5v2.h>
#include <crypto/intake.h>
FEATURE(geom_eli, "GEOM crypto module");
MALLOC_DEFINE(M_ELI, "eli data", "GEOM_ELI Data");
SYSCTL_DECL(_kern_geom);
SYSCTL_NODE(_kern_geom, OID_AUTO, eli, CTLFLAG_RW, 0, "GEOM_ELI stuff");
static int g_eli_version = G_ELI_VERSION;
SYSCTL_INT(_kern_geom_eli, OID_AUTO, version, CTLFLAG_RD, &g_eli_version, 0,
"GELI version");
int g_eli_debug = 0;
SYSCTL_INT(_kern_geom_eli, OID_AUTO, debug, CTLFLAG_RWTUN, &g_eli_debug, 0,
"Debug level");
static u_int g_eli_tries = 3;
SYSCTL_UINT(_kern_geom_eli, OID_AUTO, tries, CTLFLAG_RWTUN, &g_eli_tries, 0,
"Number of tries for entering the passphrase");
static u_int g_eli_visible_passphrase = GETS_NOECHO;
SYSCTL_UINT(_kern_geom_eli, OID_AUTO, visible_passphrase, CTLFLAG_RWTUN,
&g_eli_visible_passphrase, 0,
"Visibility of passphrase prompt (0 = invisible, 1 = visible, 2 = asterisk)");
u_int g_eli_overwrites = G_ELI_OVERWRITES;
SYSCTL_UINT(_kern_geom_eli, OID_AUTO, overwrites, CTLFLAG_RWTUN, &g_eli_overwrites,
0, "Number of times on-disk keys should be overwritten when destroying them");
static u_int g_eli_threads = 0;
SYSCTL_UINT(_kern_geom_eli, OID_AUTO, threads, CTLFLAG_RWTUN, &g_eli_threads, 0,
"Number of threads doing crypto work");
u_int g_eli_batch = 0;
SYSCTL_UINT(_kern_geom_eli, OID_AUTO, batch, CTLFLAG_RWTUN, &g_eli_batch, 0,
"Use crypto operations batching");
/*
* Passphrase cached during boot, in order to be more user-friendly if
* there are multiple providers using the same passphrase.
*/
static char cached_passphrase[256];
static u_int g_eli_boot_passcache = 1;
TUNABLE_INT("kern.geom.eli.boot_passcache", &g_eli_boot_passcache);
SYSCTL_UINT(_kern_geom_eli, OID_AUTO, boot_passcache, CTLFLAG_RD,
&g_eli_boot_passcache, 0,
"Passphrases are cached during boot process for possible reuse");
static void
fetch_loader_passphrase(void * dummy)
{
char * env_passphrase;
KASSERT(dynamic_kenv, ("need dynamic kenv"));
if ((env_passphrase = kern_getenv("kern.geom.eli.passphrase")) != NULL) {
/* Extract passphrase from the environment. */
strlcpy(cached_passphrase, env_passphrase,
sizeof(cached_passphrase));
freeenv(env_passphrase);
/* Wipe the passphrase from the environment. */
kern_unsetenv("kern.geom.eli.passphrase");
}
}
SYSINIT(geli_fetch_loader_passphrase, SI_SUB_KMEM + 1, SI_ORDER_ANY,
fetch_loader_passphrase, NULL);
static void
zero_boot_passcache(void)
{
explicit_bzero(cached_passphrase, sizeof(cached_passphrase));
}
static void
zero_geli_intake_keys(void)
{
struct keybuf *keybuf;
int i;
if ((keybuf = get_keybuf()) != NULL) {
/* Scan the key buffer, clear all GELI keys. */
for (i = 0; i < keybuf->kb_nents; i++) {
if (keybuf->kb_ents[i].ke_type == KEYBUF_TYPE_GELI) {
explicit_bzero(keybuf->kb_ents[i].ke_data,
sizeof(keybuf->kb_ents[i].ke_data));
keybuf->kb_ents[i].ke_type = KEYBUF_TYPE_NONE;
}
}
}
}
static void
zero_intake_passcache(void *dummy)
{
zero_boot_passcache();
zero_geli_intake_keys();
}
EVENTHANDLER_DEFINE(mountroot, zero_intake_passcache, NULL, 0);
static eventhandler_tag g_eli_pre_sync = NULL;
static int g_eli_destroy_geom(struct gctl_req *req, struct g_class *mp,
struct g_geom *gp);
static void g_eli_init(struct g_class *mp);
static void g_eli_fini(struct g_class *mp);
static g_taste_t g_eli_taste;
static g_dumpconf_t g_eli_dumpconf;
struct g_class g_eli_class = {
.name = G_ELI_CLASS_NAME,
.version = G_VERSION,
.ctlreq = g_eli_config,
.taste = g_eli_taste,
.destroy_geom = g_eli_destroy_geom,
.init = g_eli_init,
.fini = g_eli_fini
};
/*
* Code paths:
* BIO_READ:
* 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
* BIO_WRITE:
* g_eli_start -> g_eli_crypto_run -> g_eli_crypto_write_done -> g_io_request -> g_eli_write_done -> g_io_deliver
*/
/*
* EAGAIN from crypto(9) means, that we were probably balanced to another crypto
* accelerator or something like this.
* The function updates the SID and rerun the operation.
*/
int
g_eli_crypto_rerun(struct cryptop *crp)
{
struct g_eli_softc *sc;
struct g_eli_worker *wr;
struct bio *bp;
int error;
bp = (struct bio *)crp->crp_opaque;
sc = bp->bio_to->geom->softc;
LIST_FOREACH(wr, &sc->sc_workers, w_next) {
if (wr->w_number == bp->bio_pflags)
break;
}
KASSERT(wr != NULL, ("Invalid worker (%u).", bp->bio_pflags));
G_ELI_DEBUG(1, "Rerunning crypto %s request (sid: %ju -> %ju).",
bp->bio_cmd == BIO_READ ? "READ" : "WRITE", (uintmax_t)wr->w_sid,
(uintmax_t)crp->crp_sid);
wr->w_sid = crp->crp_sid;
crp->crp_etype = 0;
error = crypto_dispatch(crp);
if (error == 0)
return (0);
G_ELI_DEBUG(1, "%s: crypto_dispatch() returned %d.", __func__, error);
crp->crp_etype = error;
return (error);
}
/*
* The function is called afer reading encrypted data from the provider.
*
* 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
*/
void
g_eli_read_done(struct bio *bp)
{
struct g_eli_softc *sc;
struct bio *pbp;
G_ELI_LOGREQ(2, bp, "Request done.");
pbp = bp->bio_parent;
if (pbp->bio_error == 0 && bp->bio_error != 0)
pbp->bio_error = bp->bio_error;
g_destroy_bio(bp);
/*
* Do we have all sectors already?
*/
pbp->bio_inbed++;
if (pbp->bio_inbed < pbp->bio_children)
return;
sc = pbp->bio_to->geom->softc;
if (pbp->bio_error != 0) {
G_ELI_LOGREQ(0, pbp, "%s() failed (error=%d)", __func__,
pbp->bio_error);
pbp->bio_completed = 0;
if (pbp->bio_driver2 != NULL) {
free(pbp->bio_driver2, M_ELI);
pbp->bio_driver2 = NULL;
}
g_io_deliver(pbp, pbp->bio_error);
atomic_subtract_int(&sc->sc_inflight, 1);
return;
}
mtx_lock(&sc->sc_queue_mtx);
bioq_insert_tail(&sc->sc_queue, pbp);
mtx_unlock(&sc->sc_queue_mtx);
wakeup(sc);
}
/*
* The function is called after we encrypt and write data.
*
* g_eli_start -> g_eli_crypto_run -> g_eli_crypto_write_done -> g_io_request -> G_ELI_WRITE_DONE -> g_io_deliver
*/
void
g_eli_write_done(struct bio *bp)
{
struct g_eli_softc *sc;
struct bio *pbp;
G_ELI_LOGREQ(2, bp, "Request done.");
pbp = bp->bio_parent;
if (pbp->bio_error == 0 && bp->bio_error != 0)
pbp->bio_error = bp->bio_error;
g_destroy_bio(bp);
/*
* Do we have all sectors already?
*/
pbp->bio_inbed++;
if (pbp->bio_inbed < pbp->bio_children)
return;
free(pbp->bio_driver2, M_ELI);
pbp->bio_driver2 = NULL;
if (pbp->bio_error != 0) {
G_ELI_LOGREQ(0, pbp, "%s() failed (error=%d)", __func__,
pbp->bio_error);
pbp->bio_completed = 0;
} else
pbp->bio_completed = pbp->bio_length;
/*
* Write is finished, send it up.
*/
sc = pbp->bio_to->geom->softc;
g_io_deliver(pbp, pbp->bio_error);
atomic_subtract_int(&sc->sc_inflight, 1);
}
/*
* This function should never be called, but GEOM made as it set ->orphan()
* method for every geom.
*/
static void
g_eli_orphan_spoil_assert(struct g_consumer *cp)
{
panic("Function %s() called for %s.", __func__, cp->geom->name);
}
static void
g_eli_orphan(struct g_consumer *cp)
{
struct g_eli_softc *sc;
g_topology_assert();
sc = cp->geom->softc;
if (sc == NULL)
return;
g_eli_destroy(sc, TRUE);
}
/*
* BIO_READ:
* 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
* BIO_WRITE:
* G_ELI_START -> g_eli_crypto_run -> g_eli_crypto_write_done -> g_io_request -> g_eli_write_done -> g_io_deliver
*/
static void
g_eli_start(struct bio *bp)
{
struct g_eli_softc *sc;
struct g_consumer *cp;
struct bio *cbp;
sc = bp->bio_to->geom->softc;
KASSERT(sc != NULL,
("Provider's error should be set (error=%d)(device=%s).",
bp->bio_to->error, bp->bio_to->name));
G_ELI_LOGREQ(2, bp, "Request received.");
switch (bp->bio_cmd) {
case BIO_READ:
case BIO_WRITE:
case BIO_GETATTR:
case BIO_FLUSH:
case BIO_ZONE:
break;
case BIO_DELETE:
/*
* If the user hasn't set the NODELETE flag, we just pass
* it down the stack and let the layers beneath us do (or
* not) whatever they do with it. If they have, we
* reject it. A possible extension would be an
* additional flag to take it as a hint to shred the data
* with [multiple?] overwrites.
*/
if (!(sc->sc_flags & G_ELI_FLAG_NODELETE))
break;
default:
g_io_deliver(bp, EOPNOTSUPP);
return;
}
cbp = g_clone_bio(bp);
if (cbp == NULL) {
g_io_deliver(bp, ENOMEM);
return;
}
bp->bio_driver1 = cbp;
bp->bio_pflags = G_ELI_NEW_BIO;
switch (bp->bio_cmd) {
case BIO_READ:
if (!(sc->sc_flags & G_ELI_FLAG_AUTH)) {
g_eli_crypto_read(sc, bp, 0);
break;
}
/* FALLTHROUGH */
case BIO_WRITE:
mtx_lock(&sc->sc_queue_mtx);
bioq_insert_tail(&sc->sc_queue, bp);
mtx_unlock(&sc->sc_queue_mtx);
wakeup(sc);
break;
case BIO_GETATTR:
case BIO_FLUSH:
case BIO_DELETE:
case BIO_ZONE:
cbp->bio_done = g_std_done;
cp = LIST_FIRST(&sc->sc_geom->consumer);
cbp->bio_to = cp->provider;
G_ELI_LOGREQ(2, cbp, "Sending request.");
g_io_request(cbp, cp);
break;
}
}
static int
g_eli_newsession(struct g_eli_worker *wr)
{
struct g_eli_softc *sc;
struct cryptoini crie, cria;
int error;
sc = wr->w_softc;
bzero(&crie, sizeof(crie));
crie.cri_alg = sc->sc_ealgo;
crie.cri_klen = sc->sc_ekeylen;
if (sc->sc_ealgo == CRYPTO_AES_XTS)
crie.cri_klen <<= 1;
if ((sc->sc_flags & G_ELI_FLAG_FIRST_KEY) != 0) {
crie.cri_key = g_eli_key_hold(sc, 0,
LIST_FIRST(&sc->sc_geom->consumer)->provider->sectorsize);
} else {
crie.cri_key = sc->sc_ekey;
}
if (sc->sc_flags & G_ELI_FLAG_AUTH) {
bzero(&cria, sizeof(cria));
cria.cri_alg = sc->sc_aalgo;
cria.cri_klen = sc->sc_akeylen;
cria.cri_key = sc->sc_akey;
crie.cri_next = &cria;
}
switch (sc->sc_crypto) {
case G_ELI_CRYPTO_SW:
error = crypto_newsession(&wr->w_sid, &crie,
CRYPTOCAP_F_SOFTWARE);
break;
case G_ELI_CRYPTO_HW:
error = crypto_newsession(&wr->w_sid, &crie,
CRYPTOCAP_F_HARDWARE);
break;
case G_ELI_CRYPTO_UNKNOWN:
error = crypto_newsession(&wr->w_sid, &crie,
CRYPTOCAP_F_HARDWARE);
if (error == 0) {
mtx_lock(&sc->sc_queue_mtx);
if (sc->sc_crypto == G_ELI_CRYPTO_UNKNOWN)
sc->sc_crypto = G_ELI_CRYPTO_HW;
mtx_unlock(&sc->sc_queue_mtx);
} else {
error = crypto_newsession(&wr->w_sid, &crie,
CRYPTOCAP_F_SOFTWARE);
mtx_lock(&sc->sc_queue_mtx);
if (sc->sc_crypto == G_ELI_CRYPTO_UNKNOWN)
sc->sc_crypto = G_ELI_CRYPTO_SW;
mtx_unlock(&sc->sc_queue_mtx);
}
break;
default:
panic("%s: invalid condition", __func__);
}
if ((sc->sc_flags & G_ELI_FLAG_FIRST_KEY) != 0)
g_eli_key_drop(sc, crie.cri_key);
return (error);
}
static void
g_eli_freesession(struct g_eli_worker *wr)
{
crypto_freesession(wr->w_sid);
}
static void
g_eli_cancel(struct g_eli_softc *sc)
{
struct bio *bp;
mtx_assert(&sc->sc_queue_mtx, MA_OWNED);
while ((bp = bioq_takefirst(&sc->sc_queue)) != NULL) {
KASSERT(bp->bio_pflags == G_ELI_NEW_BIO,
("Not new bio when canceling (bp=%p).", bp));
g_io_deliver(bp, ENXIO);
}
}
static struct bio *
g_eli_takefirst(struct g_eli_softc *sc)
{
struct bio *bp;
mtx_assert(&sc->sc_queue_mtx, MA_OWNED);
if (!(sc->sc_flags & G_ELI_FLAG_SUSPEND))
return (bioq_takefirst(&sc->sc_queue));
/*
* Device suspended, so we skip new I/O requests.
*/
TAILQ_FOREACH(bp, &sc->sc_queue.queue, bio_queue) {
if (bp->bio_pflags != G_ELI_NEW_BIO)
break;
}
if (bp != NULL)
bioq_remove(&sc->sc_queue, bp);
return (bp);
}
/*
* This is the main function for kernel worker thread when we don't have
* hardware acceleration and we have to do cryptography in software.
* Dedicated thread is needed, so we don't slow down g_up/g_down GEOM
* threads with crypto work.
*/
static void
g_eli_worker(void *arg)
{
struct g_eli_softc *sc;
struct g_eli_worker *wr;
struct bio *bp;
int error;
wr = arg;
sc = wr->w_softc;
#ifdef EARLY_AP_STARTUP
MPASS(!sc->sc_cpubind || smp_started);
#elif defined(SMP)
/* Before sched_bind() to a CPU, wait for all CPUs to go on-line. */
if (sc->sc_cpubind) {
while (!smp_started)
tsleep(wr, 0, "geli:smp", hz / 4);
}
#endif
thread_lock(curthread);
sched_prio(curthread, PUSER);
if (sc->sc_cpubind)
sched_bind(curthread, wr->w_number % mp_ncpus);
thread_unlock(curthread);
G_ELI_DEBUG(1, "Thread %s started.", curthread->td_proc->p_comm);
for (;;) {
mtx_lock(&sc->sc_queue_mtx);
again:
bp = g_eli_takefirst(sc);
if (bp == NULL) {
if (sc->sc_flags & G_ELI_FLAG_DESTROY) {
g_eli_cancel(sc);
LIST_REMOVE(wr, w_next);
g_eli_freesession(wr);
free(wr, M_ELI);
G_ELI_DEBUG(1, "Thread %s exiting.",
curthread->td_proc->p_comm);
wakeup(&sc->sc_workers);
mtx_unlock(&sc->sc_queue_mtx);
kproc_exit(0);
}
while (sc->sc_flags & G_ELI_FLAG_SUSPEND) {
if (sc->sc_inflight > 0) {
G_ELI_DEBUG(0, "inflight=%d",
sc->sc_inflight);
/*
* We still have inflight BIOs, so
* sleep and retry.
*/
msleep(sc, &sc->sc_queue_mtx, PRIBIO,
"geli:inf", hz / 5);
goto again;
}
/*
* Suspend requested, mark the worker as
* suspended and go to sleep.
*/
if (wr->w_active) {
g_eli_freesession(wr);
wr->w_active = FALSE;
}
wakeup(&sc->sc_workers);
msleep(sc, &sc->sc_queue_mtx, PRIBIO,
"geli:suspend", 0);
if (!wr->w_active &&
!(sc->sc_flags & G_ELI_FLAG_SUSPEND)) {
error = g_eli_newsession(wr);
KASSERT(error == 0,
("g_eli_newsession() failed on resume (error=%d)",
error));
wr->w_active = TRUE;
}
goto again;
}
msleep(sc, &sc->sc_queue_mtx, PDROP, "geli:w", 0);
continue;
}
if (bp->bio_pflags == G_ELI_NEW_BIO)
atomic_add_int(&sc->sc_inflight, 1);
mtx_unlock(&sc->sc_queue_mtx);
if (bp->bio_pflags == G_ELI_NEW_BIO) {
bp->bio_pflags = 0;
if (sc->sc_flags & G_ELI_FLAG_AUTH) {
if (bp->bio_cmd == BIO_READ)
g_eli_auth_read(sc, bp);
else
g_eli_auth_run(wr, bp);
} else {
if (bp->bio_cmd == BIO_READ)
g_eli_crypto_read(sc, bp, 1);
else
g_eli_crypto_run(wr, bp);
}
} else {
if (sc->sc_flags & G_ELI_FLAG_AUTH)
g_eli_auth_run(wr, bp);
else
g_eli_crypto_run(wr, bp);
}
}
}
int
g_eli_read_metadata(struct g_class *mp, struct g_provider *pp,
struct g_eli_metadata *md)
{
struct g_geom *gp;
struct g_consumer *cp;
u_char *buf = NULL;
int error;
g_topology_assert();
gp = g_new_geomf(mp, "eli:taste");
gp->start = g_eli_start;
gp->access = g_std_access;
/*
* g_eli_read_metadata() is always called from the event thread.
* Our geom is created and destroyed in the same event, so there
* could be no orphan nor spoil event in the meantime.
*/
gp->orphan = g_eli_orphan_spoil_assert;
gp->spoiled = g_eli_orphan_spoil_assert;
cp = g_new_consumer(gp);
error = g_attach(cp, pp);
if (error != 0)
goto end;
error = g_access(cp, 1, 0, 0);
if (error != 0)
goto end;
g_topology_unlock();
buf = g_read_data(cp, pp->mediasize - pp->sectorsize, pp->sectorsize,
&error);
g_topology_lock();
if (buf == NULL)
goto end;
error = eli_metadata_decode(buf, md);
if (error != 0)
goto end;
/* Metadata was read and decoded successfully. */
end:
if (buf != NULL)
g_free(buf);
if (cp->provider != NULL) {
if (cp->acr == 1)
g_access(cp, -1, 0, 0);
g_detach(cp);
}
g_destroy_consumer(cp);
g_destroy_geom(gp);
return (error);
}
/*
* The function is called when we had last close on provider and user requested
* to close it when this situation occur.
*/
static void
g_eli_last_close(void *arg, int flags __unused)
{
struct g_geom *gp;
char gpname[64];
int error;
g_topology_assert();
gp = arg;
strlcpy(gpname, gp->name, sizeof(gpname));
error = g_eli_destroy(gp->softc, TRUE);
KASSERT(error == 0, ("Cannot detach %s on last close (error=%d).",
gpname, error));
G_ELI_DEBUG(0, "Detached %s on last close.", gpname);
}
int
g_eli_access(struct g_provider *pp, int dr, int dw, int de)
{
struct g_eli_softc *sc;
struct g_geom *gp;
gp = pp->geom;
sc = gp->softc;
if (dw > 0) {
if (sc->sc_flags & G_ELI_FLAG_RO) {
/* Deny write attempts. */
return (EROFS);
}
/* Someone is opening us for write, we need to remember that. */
sc->sc_flags |= G_ELI_FLAG_WOPEN;
return (0);
}
/* Is this the last close? */
if (pp->acr + dr > 0 || pp->acw + dw > 0 || pp->ace + de > 0)
return (0);
/*
* Automatically detach on last close if requested.
*/
if ((sc->sc_flags & G_ELI_FLAG_RW_DETACH) ||
(sc->sc_flags & G_ELI_FLAG_WOPEN)) {
g_post_event(g_eli_last_close, gp, M_WAITOK, NULL);
}
return (0);
}
static int
g_eli_cpu_is_disabled(int cpu)
{
#ifdef SMP
return (CPU_ISSET(cpu, &hlt_cpus_mask));
#else
return (0);
#endif
}
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)
{
struct g_eli_softc *sc;
struct g_eli_worker *wr;
struct g_geom *gp;
struct g_provider *pp;
struct g_consumer *cp;
u_int i, threads;
int error;
G_ELI_DEBUG(1, "Creating device %s%s.", bpp->name, G_ELI_SUFFIX);
gp = g_new_geomf(mp, "%s%s", bpp->name, G_ELI_SUFFIX);
sc = malloc(sizeof(*sc), M_ELI, M_WAITOK | M_ZERO);
gp->start = g_eli_start;
/*
* Spoiling can happen even though we have the provider open
* exclusively, e.g. through media change events.
*/
gp->spoiled = g_eli_orphan;
gp->orphan = g_eli_orphan;
gp->dumpconf = g_eli_dumpconf;
/*
* If detach-on-last-close feature is not enabled and we don't operate
* on read-only provider, we can simply use g_std_access().
*/
if (md->md_flags & (G_ELI_FLAG_WO_DETACH | G_ELI_FLAG_RO))
gp->access = g_eli_access;
else
gp->access = g_std_access;
eli_metadata_softc(sc, md, bpp->sectorsize, bpp->mediasize);
sc->sc_nkey = nkey;
gp->softc = sc;
sc->sc_geom = gp;
bioq_init(&sc->sc_queue);
mtx_init(&sc->sc_queue_mtx, "geli:queue", NULL, MTX_DEF);
mtx_init(&sc->sc_ekeys_lock, "geli:ekeys", NULL, MTX_DEF);
pp = NULL;
cp = g_new_consumer(gp);
error = g_attach(cp, bpp);
if (error != 0) {
if (req != NULL) {
gctl_error(req, "Cannot attach to %s (error=%d).",
bpp->name, error);
} else {
G_ELI_DEBUG(1, "Cannot attach to %s (error=%d).",
bpp->name, error);
}
goto failed;
}
/*
* Keep provider open all the time, so we can run critical tasks,
* like Master Keys deletion, without wondering if we can open
* provider or not.
* We don't open provider for writing only when user requested read-only
* access.
*/
if (sc->sc_flags & G_ELI_FLAG_RO)
error = g_access(cp, 1, 0, 1);
else
error = g_access(cp, 1, 1, 1);
if (error != 0) {
if (req != NULL) {
gctl_error(req, "Cannot access %s (error=%d).",
bpp->name, error);
} else {
G_ELI_DEBUG(1, "Cannot access %s (error=%d).",
bpp->name, error);
}
goto failed;
}
/*
* Remember the keys in our softc structure.
*/
g_eli_mkey_propagate(sc, mkey);
LIST_INIT(&sc->sc_workers);
threads = g_eli_threads;
if (threads == 0)
threads = mp_ncpus;
sc->sc_cpubind = (mp_ncpus > 1 && threads == mp_ncpus);
for (i = 0; i < threads; i++) {
if (g_eli_cpu_is_disabled(i)) {
G_ELI_DEBUG(1, "%s: CPU %u disabled, skipping.",
bpp->name, i);
continue;
}
wr = malloc(sizeof(*wr), M_ELI, M_WAITOK | M_ZERO);
wr->w_softc = sc;
wr->w_number = i;
wr->w_active = TRUE;
error = g_eli_newsession(wr);
if (error != 0) {
free(wr, M_ELI);
if (req != NULL) {
gctl_error(req, "Cannot set up crypto session "
"for %s (error=%d).", bpp->name, error);
} else {
G_ELI_DEBUG(1, "Cannot set up crypto session "
"for %s (error=%d).", bpp->name, error);
}
goto failed;
}
error = kproc_create(g_eli_worker, wr, &wr->w_proc, 0, 0,
"g_eli[%u] %s", i, bpp->name);
if (error != 0) {
g_eli_freesession(wr);
free(wr, M_ELI);
if (req != NULL) {
gctl_error(req, "Cannot create kernel thread "
"for %s (error=%d).", bpp->name, error);
} else {
G_ELI_DEBUG(1, "Cannot create kernel thread "
"for %s (error=%d).", bpp->name, error);
}
goto failed;
}
LIST_INSERT_HEAD(&sc->sc_workers, wr, w_next);
}
/*
* Create decrypted provider.
*/
pp = g_new_providerf(gp, "%s%s", bpp->name, G_ELI_SUFFIX);
pp->mediasize = sc->sc_mediasize;
pp->sectorsize = sc->sc_sectorsize;
g_error_provider(pp, 0);
G_ELI_DEBUG(0, "Device %s created.", pp->name);
G_ELI_DEBUG(0, "Encryption: %s %u", g_eli_algo2str(sc->sc_ealgo),
sc->sc_ekeylen);
if (sc->sc_flags & G_ELI_FLAG_AUTH)
G_ELI_DEBUG(0, " Integrity: %s", g_eli_algo2str(sc->sc_aalgo));
G_ELI_DEBUG(0, " Crypto: %s",
sc->sc_crypto == G_ELI_CRYPTO_SW ? "software" : "hardware");
return (gp);
failed:
mtx_lock(&sc->sc_queue_mtx);
sc->sc_flags |= G_ELI_FLAG_DESTROY;
wakeup(sc);
/*
* Wait for kernel threads self destruction.
*/
while (!LIST_EMPTY(&sc->sc_workers)) {
msleep(&sc->sc_workers, &sc->sc_queue_mtx, PRIBIO,
"geli:destroy", 0);
}
mtx_destroy(&sc->sc_queue_mtx);
if (cp->provider != NULL) {
if (cp->acr == 1)
g_access(cp, -1, -1, -1);
g_detach(cp);
}
g_destroy_consumer(cp);
g_destroy_geom(gp);
g_eli_key_destroy(sc);
bzero(sc, sizeof(*sc));
free(sc, M_ELI);
return (NULL);
}
int
g_eli_destroy(struct g_eli_softc *sc, boolean_t force)
{
struct g_geom *gp;
struct g_provider *pp;
g_topology_assert();
if (sc == NULL)
return (ENXIO);
gp = sc->sc_geom;
pp = LIST_FIRST(&gp->provider);
if (pp != NULL && (pp->acr != 0 || pp->acw != 0 || pp->ace != 0)) {
if (force) {
G_ELI_DEBUG(1, "Device %s is still open, so it "
"cannot be definitely removed.", pp->name);
sc->sc_flags |= G_ELI_FLAG_RW_DETACH;
gp->access = g_eli_access;
g_wither_provider(pp, ENXIO);
return (EBUSY);
} else {
G_ELI_DEBUG(1,
"Device %s is still open (r%dw%de%d).", pp->name,
pp->acr, pp->acw, pp->ace);
return (EBUSY);
}
}
mtx_lock(&sc->sc_queue_mtx);
sc->sc_flags |= G_ELI_FLAG_DESTROY;
wakeup(sc);
while (!LIST_EMPTY(&sc->sc_workers)) {
msleep(&sc->sc_workers, &sc->sc_queue_mtx, PRIBIO,
"geli:destroy", 0);
}
mtx_destroy(&sc->sc_queue_mtx);
gp->softc = NULL;
g_eli_key_destroy(sc);
bzero(sc, sizeof(*sc));
free(sc, M_ELI);
if (pp == NULL || (pp->acr == 0 && pp->acw == 0 && pp->ace == 0))
G_ELI_DEBUG(0, "Device %s destroyed.", gp->name);
g_wither_geom_close(gp, ENXIO);
return (0);
}
static int
g_eli_destroy_geom(struct gctl_req *req __unused,
struct g_class *mp __unused, struct g_geom *gp)
{
struct g_eli_softc *sc;
sc = gp->softc;
return (g_eli_destroy(sc, FALSE));
}
static int
g_eli_keyfiles_load(struct hmac_ctx *ctx, const char *provider)
{
u_char *keyfile, *data;
char *file, name[64];
size_t size;
int i;
for (i = 0; ; i++) {
snprintf(name, sizeof(name), "%s:geli_keyfile%d", provider, i);
keyfile = preload_search_by_type(name);
if (keyfile == NULL && i == 0) {
/*
* If there is only one keyfile, allow simpler name.
*/
snprintf(name, sizeof(name), "%s:geli_keyfile", provider);
keyfile = preload_search_by_type(name);
}
if (keyfile == NULL)
return (i); /* Return number of loaded keyfiles. */
data = preload_fetch_addr(keyfile);
if (data == NULL) {
G_ELI_DEBUG(0, "Cannot find key file data for %s.",
name);
return (0);
}
size = preload_fetch_size(keyfile);
if (size == 0) {
G_ELI_DEBUG(0, "Cannot find key file size for %s.",
name);
return (0);
}
file = preload_search_info(keyfile, MODINFO_NAME);
if (file == NULL) {
G_ELI_DEBUG(0, "Cannot find key file name for %s.",
name);
return (0);
}
G_ELI_DEBUG(1, "Loaded keyfile %s for %s (type: %s).", file,
provider, name);
g_eli_crypto_hmac_update(ctx, data, size);
}
}
static void
g_eli_keyfiles_clear(const char *provider)
{
u_char *keyfile, *data;
char name[64];
size_t size;
int i;
for (i = 0; ; i++) {
snprintf(name, sizeof(name), "%s:geli_keyfile%d", provider, i);
keyfile = preload_search_by_type(name);
if (keyfile == NULL)
return;
data = preload_fetch_addr(keyfile);
size = preload_fetch_size(keyfile);
if (data != NULL && size != 0)
bzero(data, size);
}
}
/*
* Tasting is only made on boot.
* We detect providers which should be attached before root is mounted.
*/
static struct g_geom *
g_eli_taste(struct g_class *mp, struct g_provider *pp, int flags __unused)
{
struct g_eli_metadata md;
struct g_geom *gp;
struct hmac_ctx ctx;
char passphrase[256];
u_char key[G_ELI_USERKEYLEN], mkey[G_ELI_DATAIVKEYLEN];
u_int i, nkey, nkeyfiles, tries, showpass;
int error;
struct keybuf *keybuf;
g_trace(G_T_TOPOLOGY, "%s(%s, %s)", __func__, mp->name, pp->name);
g_topology_assert();
if (root_mounted() || g_eli_tries == 0)
return (NULL);
G_ELI_DEBUG(3, "Tasting %s.", pp->name);
error = g_eli_read_metadata(mp, pp, &md);
if (error != 0)
return (NULL);
gp = NULL;
if (strcmp(md.md_magic, G_ELI_MAGIC) != 0)
return (NULL);
if (md.md_version > G_ELI_VERSION) {
printf("geom_eli.ko module is too old to handle %s.\n",
pp->name);
return (NULL);
}
if (md.md_provsize != pp->mediasize)
return (NULL);
/* Should we attach it on boot? */
if (!(md.md_flags & G_ELI_FLAG_BOOT))
return (NULL);
if (md.md_keys == 0x00) {
G_ELI_DEBUG(0, "No valid keys on %s.", pp->name);
return (NULL);
}
if (md.md_iterations == -1) {
/* If there is no passphrase, we try only once. */
tries = 1;
} else {
/* Ask for the passphrase no more than g_eli_tries times. */
tries = g_eli_tries;
}
if ((keybuf = get_keybuf()) != NULL) {
/* Scan the key buffer, try all GELI keys. */
for (i = 0; i < keybuf->kb_nents; i++) {
if (keybuf->kb_ents[i].ke_type == KEYBUF_TYPE_GELI) {
memcpy(key, keybuf->kb_ents[i].ke_data,
sizeof(key));
if (g_eli_mkey_decrypt(&md, key,
mkey, &nkey) == 0 ) {
explicit_bzero(key, sizeof(key));
goto have_key;
}
}
}
}
for (i = 0; i <= tries; i++) {
g_eli_crypto_hmac_init(&ctx, NULL, 0);
/*
* Load all key files.
*/
nkeyfiles = g_eli_keyfiles_load(&ctx, pp->name);
if (nkeyfiles == 0 && md.md_iterations == -1) {
/*
* No key files and no passphrase, something is
* definitely wrong here.
* geli(8) doesn't allow for such situation, so assume
* that there was really no passphrase and in that case
* key files are no properly defined in loader.conf.
*/
G_ELI_DEBUG(0,
"Found no key files in loader.conf for %s.",
pp->name);
return (NULL);
}
/* Ask for the passphrase if defined. */
if (md.md_iterations >= 0) {
/* Try first with cached passphrase. */
if (i == 0) {
if (!g_eli_boot_passcache)
continue;
memcpy(passphrase, cached_passphrase,
sizeof(passphrase));
} else {
printf("Enter passphrase for %s: ", pp->name);
showpass = g_eli_visible_passphrase;
if ((md.md_flags & G_ELI_FLAG_GELIDISPLAYPASS) != 0)
showpass = GETS_ECHOPASS;
cngets(passphrase, sizeof(passphrase),
showpass);
memcpy(cached_passphrase, passphrase,
sizeof(passphrase));
}
}
/*
* Prepare Derived-Key from the user passphrase.
*/
if (md.md_iterations == 0) {
g_eli_crypto_hmac_update(&ctx, md.md_salt,
sizeof(md.md_salt));
g_eli_crypto_hmac_update(&ctx, passphrase,
strlen(passphrase));
explicit_bzero(passphrase, sizeof(passphrase));
} else if (md.md_iterations > 0) {
u_char dkey[G_ELI_USERKEYLEN];
pkcs5v2_genkey(dkey, sizeof(dkey), md.md_salt,
sizeof(md.md_salt), passphrase, md.md_iterations);
bzero(passphrase, sizeof(passphrase));
g_eli_crypto_hmac_update(&ctx, dkey, sizeof(dkey));
explicit_bzero(dkey, sizeof(dkey));
}
g_eli_crypto_hmac_final(&ctx, key, 0);
/*
* Decrypt Master-Key.
*/
error = g_eli_mkey_decrypt(&md, key, mkey, &nkey);
bzero(key, sizeof(key));
if (error == -1) {
if (i == tries) {
G_ELI_DEBUG(0,
"Wrong key for %s. No tries left.",
pp->name);
g_eli_keyfiles_clear(pp->name);
return (NULL);
}
if (i > 0) {
G_ELI_DEBUG(0,
"Wrong key for %s. Tries left: %u.",
pp->name, tries - i);
}
/* Try again. */
continue;
} else if (error > 0) {
G_ELI_DEBUG(0,
"Cannot decrypt Master Key for %s (error=%d).",
pp->name, error);
g_eli_keyfiles_clear(pp->name);
return (NULL);
}
g_eli_keyfiles_clear(pp->name);
G_ELI_DEBUG(1, "Using Master Key %u for %s.", nkey, pp->name);
break;
}
have_key:
/*
* We have correct key, let's attach provider.
*/
gp = g_eli_create(NULL, mp, pp, &md, mkey, nkey);
bzero(mkey, sizeof(mkey));
bzero(&md, sizeof(md));
if (gp == NULL) {
G_ELI_DEBUG(0, "Cannot create device %s%s.", pp->name,
G_ELI_SUFFIX);
return (NULL);
}
return (gp);
}
static void
g_eli_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp,
struct g_consumer *cp, struct g_provider *pp)
{
struct g_eli_softc *sc;
g_topology_assert();
sc = gp->softc;
if (sc == NULL)
return;
if (pp != NULL || cp != NULL)
return; /* Nothing here. */
sbuf_printf(sb, "%s<KeysTotal>%ju</KeysTotal>\n", indent,
(uintmax_t)sc->sc_ekeys_total);
sbuf_printf(sb, "%s<KeysAllocated>%ju</KeysAllocated>\n", indent,
(uintmax_t)sc->sc_ekeys_allocated);
sbuf_printf(sb, "%s<Flags>", indent);
if (sc->sc_flags == 0)
sbuf_printf(sb, "NONE");
else {
int first = 1;
#define ADD_FLAG(flag, name) do { \
if (sc->sc_flags & (flag)) { \
if (!first) \
sbuf_printf(sb, ", "); \
else \
first = 0; \
sbuf_printf(sb, name); \
} \
} while (0)
ADD_FLAG(G_ELI_FLAG_SUSPEND, "SUSPEND");
ADD_FLAG(G_ELI_FLAG_SINGLE_KEY, "SINGLE-KEY");
ADD_FLAG(G_ELI_FLAG_NATIVE_BYTE_ORDER, "NATIVE-BYTE-ORDER");
ADD_FLAG(G_ELI_FLAG_ONETIME, "ONETIME");
ADD_FLAG(G_ELI_FLAG_BOOT, "BOOT");
ADD_FLAG(G_ELI_FLAG_WO_DETACH, "W-DETACH");
ADD_FLAG(G_ELI_FLAG_RW_DETACH, "RW-DETACH");
ADD_FLAG(G_ELI_FLAG_AUTH, "AUTH");
ADD_FLAG(G_ELI_FLAG_WOPEN, "W-OPEN");
ADD_FLAG(G_ELI_FLAG_DESTROY, "DESTROY");
ADD_FLAG(G_ELI_FLAG_RO, "READ-ONLY");
ADD_FLAG(G_ELI_FLAG_NODELETE, "NODELETE");
ADD_FLAG(G_ELI_FLAG_GELIBOOT, "GELIBOOT");
ADD_FLAG(G_ELI_FLAG_GELIDISPLAYPASS, "GELIDISPLAYPASS");
#undef ADD_FLAG
}
sbuf_printf(sb, "</Flags>\n");
if (!(sc->sc_flags & G_ELI_FLAG_ONETIME)) {
sbuf_printf(sb, "%s<UsedKey>%u</UsedKey>\n", indent,
sc->sc_nkey);
}
sbuf_printf(sb, "%s<Version>%u</Version>\n", indent, sc->sc_version);
sbuf_printf(sb, "%s<Crypto>", indent);
switch (sc->sc_crypto) {
case G_ELI_CRYPTO_HW:
sbuf_printf(sb, "hardware");
break;
case G_ELI_CRYPTO_SW:
sbuf_printf(sb, "software");
break;
default:
sbuf_printf(sb, "UNKNOWN");
break;
}
sbuf_printf(sb, "</Crypto>\n");
if (sc->sc_flags & G_ELI_FLAG_AUTH) {
sbuf_printf(sb,
"%s<AuthenticationAlgorithm>%s</AuthenticationAlgorithm>\n",
indent, g_eli_algo2str(sc->sc_aalgo));
}
sbuf_printf(sb, "%s<KeyLength>%u</KeyLength>\n", indent,
sc->sc_ekeylen);
sbuf_printf(sb, "%s<EncryptionAlgorithm>%s</EncryptionAlgorithm>\n",
indent, g_eli_algo2str(sc->sc_ealgo));
sbuf_printf(sb, "%s<State>%s</State>\n", indent,
(sc->sc_flags & G_ELI_FLAG_SUSPEND) ? "SUSPENDED" : "ACTIVE");
}
static void
g_eli_shutdown_pre_sync(void *arg, int howto)
{
struct g_class *mp;
struct g_geom *gp, *gp2;
struct g_provider *pp;
struct g_eli_softc *sc;
int error;
mp = arg;
g_topology_lock();
LIST_FOREACH_SAFE(gp, &mp->geom, geom, gp2) {
sc = gp->softc;
if (sc == NULL)
continue;
pp = LIST_FIRST(&gp->provider);
KASSERT(pp != NULL, ("No provider? gp=%p (%s)", gp, gp->name));
if (pp->acr + pp->acw + pp->ace == 0)
error = g_eli_destroy(sc, TRUE);
else {
sc->sc_flags |= G_ELI_FLAG_RW_DETACH;
gp->access = g_eli_access;
}
}
g_topology_unlock();
}
static void
g_eli_init(struct g_class *mp)
{
g_eli_pre_sync = EVENTHANDLER_REGISTER(shutdown_pre_sync,
g_eli_shutdown_pre_sync, mp, SHUTDOWN_PRI_FIRST);
if (g_eli_pre_sync == NULL)
G_ELI_DEBUG(0, "Warning! Cannot register shutdown event.");
}
static void
g_eli_fini(struct g_class *mp)
{
if (g_eli_pre_sync != NULL)
EVENTHANDLER_DEREGISTER(shutdown_pre_sync, g_eli_pre_sync);
}
DECLARE_GEOM_CLASS(g_eli_class, g_eli);
MODULE_DEPEND(g_eli, crypto, 1, 1, 1);
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