297 lines
7.7 KiB
C
297 lines
7.7 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2002 Poul-Henning Kamp
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* Copyright (c) 2002 Networks Associates Technology, Inc.
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* All rights reserved.
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*
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* This software was developed for the FreeBSD Project by Poul-Henning Kamp
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* and NAI Labs, the Security Research Division of Network Associates, Inc.
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* under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
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* DARPA CHATS research program.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*/
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#include <sys/param.h>
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#include <sys/bio.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/malloc.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/kthread.h>
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#include <sys/sysctl.h>
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#include <crypto/rijndael/rijndael-api-fst.h>
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#include <crypto/sha2/sha512.h>
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#include <geom/geom.h>
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#include <geom/bde/g_bde.h>
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#define BDE_CLASS_NAME "BDE"
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FEATURE(geom_bde, "GEOM-based Disk Encryption");
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static void
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g_bde_start(struct bio *bp)
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{
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switch (bp->bio_cmd) {
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case BIO_DELETE:
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case BIO_READ:
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case BIO_WRITE:
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g_bde_start1(bp);
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break;
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case BIO_GETATTR:
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g_io_deliver(bp, EOPNOTSUPP);
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break;
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default:
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g_io_deliver(bp, EOPNOTSUPP);
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return;
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}
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return;
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}
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static void
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g_bde_orphan(struct g_consumer *cp)
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{
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struct g_geom *gp;
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struct g_provider *pp;
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struct g_bde_softc *sc;
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g_trace(G_T_TOPOLOGY, "g_bde_orphan(%p/%s)", cp, cp->provider->name);
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g_topology_assert();
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gp = cp->geom;
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sc = gp->softc;
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gp->flags |= G_GEOM_WITHER;
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LIST_FOREACH(pp, &gp->provider, provider)
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g_wither_provider(pp, ENXIO);
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explicit_bzero(sc, sizeof(struct g_bde_softc)); /* destroy evidence */
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return;
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}
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static int
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g_bde_access(struct g_provider *pp, int dr, int dw, int de)
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{
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struct g_geom *gp;
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struct g_consumer *cp;
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gp = pp->geom;
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cp = LIST_FIRST(&gp->consumer);
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if (cp->acr == 0 && cp->acw == 0 && cp->ace == 0) {
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de++;
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dr++;
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}
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/* ... and let go of it on last close */
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if ((cp->acr + dr) == 0 && (cp->acw + dw) == 0 && (cp->ace + de) == 1) {
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de--;
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dr--;
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}
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return (g_access(cp, dr, dw, de));
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}
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static void
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g_bde_create_geom(struct gctl_req *req, struct g_class *mp, struct g_provider *pp)
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{
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struct g_geom *gp;
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struct g_consumer *cp;
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struct g_bde_key *kp;
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int error, i;
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u_int sectorsize;
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off_t mediasize;
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struct g_bde_softc *sc;
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void *pass;
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void *key;
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g_trace(G_T_TOPOLOGY, "g_bde_create_geom(%s, %s)", mp->name, pp->name);
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g_topology_assert();
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gp = NULL;
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gp = g_new_geomf(mp, "%s.bde", pp->name);
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cp = g_new_consumer(gp);
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error = g_attach(cp, pp);
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if (error != 0) {
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g_destroy_consumer(cp);
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g_destroy_geom(gp);
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gctl_error(req, "could not attach consumer");
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return;
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}
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error = g_access(cp, 1, 1, 1);
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if (error) {
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g_detach(cp);
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g_destroy_consumer(cp);
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g_destroy_geom(gp);
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gctl_error(req, "could not access consumer");
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return;
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}
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pass = NULL;
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key = NULL;
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do {
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pass = gctl_get_param(req, "pass", &i);
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if (pass == NULL || i != SHA512_DIGEST_LENGTH) {
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gctl_error(req, "No usable key presented");
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break;
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}
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key = gctl_get_param(req, "key", &i);
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if (key != NULL && i != 16) {
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gctl_error(req, "Invalid key presented");
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break;
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}
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sectorsize = cp->provider->sectorsize;
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mediasize = cp->provider->mediasize;
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sc = g_malloc(sizeof(struct g_bde_softc), M_WAITOK | M_ZERO);
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gp->softc = sc;
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sc->geom = gp;
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sc->consumer = cp;
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error = g_bde_decrypt_lock(sc, pass, key,
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mediasize, sectorsize, NULL);
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explicit_bzero(sc->sha2, sizeof sc->sha2);
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if (error)
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break;
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kp = &sc->key;
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/* Initialize helper-fields */
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kp->keys_per_sector = kp->sectorsize / G_BDE_SKEYLEN;
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kp->zone_cont = kp->keys_per_sector * kp->sectorsize;
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kp->zone_width = kp->zone_cont + kp->sectorsize;
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kp->media_width = kp->sectorN - kp->sector0 -
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G_BDE_MAXKEYS * kp->sectorsize;
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/* Our external parameters */
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sc->zone_cont = kp->zone_cont;
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sc->mediasize = g_bde_max_sector(kp);
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sc->sectorsize = kp->sectorsize;
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TAILQ_INIT(&sc->freelist);
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TAILQ_INIT(&sc->worklist);
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mtx_init(&sc->worklist_mutex, "g_bde_worklist", NULL, MTX_DEF);
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/* XXX: error check */
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kproc_create(g_bde_worker, gp, &sc->thread, 0, 0,
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"g_bde %s", gp->name);
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pp = g_new_providerf(gp, "%s", gp->name);
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pp->stripesize = kp->zone_cont;
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pp->stripeoffset = 0;
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pp->mediasize = sc->mediasize;
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pp->sectorsize = sc->sectorsize;
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g_error_provider(pp, 0);
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break;
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} while (0);
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if (pass != NULL)
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explicit_bzero(pass, SHA512_DIGEST_LENGTH);
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if (key != NULL)
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explicit_bzero(key, 16);
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if (error == 0)
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return;
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g_access(cp, -1, -1, -1);
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g_detach(cp);
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g_destroy_consumer(cp);
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g_free(gp->softc);
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g_destroy_geom(gp);
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switch (error) {
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case ENOENT:
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gctl_error(req, "Lock was destroyed");
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break;
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case ESRCH:
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gctl_error(req, "Lock was nuked");
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break;
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case EINVAL:
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gctl_error(req, "Could not open lock");
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break;
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case ENOTDIR:
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gctl_error(req, "Lock not found");
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break;
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default:
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gctl_error(req, "Could not open lock (%d)", error);
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break;
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}
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return;
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}
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static int
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g_bde_destroy_geom(struct gctl_req *req, struct g_class *mp, struct g_geom *gp)
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{
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struct g_consumer *cp;
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struct g_provider *pp;
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struct g_bde_softc *sc;
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g_trace(G_T_TOPOLOGY, "g_bde_destroy_geom(%s, %s)", mp->name, gp->name);
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g_topology_assert();
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/*
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* Orderly detachment.
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*/
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KASSERT(gp != NULL, ("NULL geom"));
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pp = LIST_FIRST(&gp->provider);
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KASSERT(pp != NULL, ("NULL provider"));
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if (pp->acr > 0 || pp->acw > 0 || pp->ace > 0)
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return (EBUSY);
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sc = gp->softc;
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cp = LIST_FIRST(&gp->consumer);
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KASSERT(cp != NULL, ("NULL consumer"));
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sc->dead = 1;
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wakeup(sc);
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g_access(cp, -1, -1, -1);
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g_detach(cp);
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g_destroy_consumer(cp);
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while (sc->dead != 2 && !LIST_EMPTY(&pp->consumers))
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tsleep(sc, PRIBIO, "g_bdedie", hz);
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mtx_destroy(&sc->worklist_mutex);
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explicit_bzero(&sc->key, sizeof sc->key);
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g_free(sc);
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g_wither_geom(gp, ENXIO);
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return (0);
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}
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static void
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g_bde_ctlreq(struct gctl_req *req, struct g_class *mp, char const *verb)
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{
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struct g_geom *gp;
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struct g_provider *pp;
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if (!strcmp(verb, "create geom")) {
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pp = gctl_get_provider(req, "provider");
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if (pp != NULL)
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g_bde_create_geom(req, mp, pp);
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} else if (!strcmp(verb, "destroy geom")) {
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gp = gctl_get_geom(req, mp, "geom");
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if (gp != NULL)
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g_bde_destroy_geom(req, mp, gp);
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} else {
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gctl_error(req, "unknown verb");
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}
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}
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static struct g_class g_bde_class = {
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.name = BDE_CLASS_NAME,
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.version = G_VERSION,
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.destroy_geom = g_bde_destroy_geom,
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.ctlreq = g_bde_ctlreq,
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.start = g_bde_start,
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.orphan = g_bde_orphan,
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.access = g_bde_access,
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.spoiled = g_std_spoiled,
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};
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DECLARE_GEOM_CLASS(g_bde_class, g_bde);
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MODULE_VERSION(geom_bde, 0);
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