g_bde.c revision 238198
1/*- 2 * Copyright (c) 2002 Poul-Henning Kamp 3 * Copyright (c) 2002 Networks Associates Technology, Inc. 4 * All rights reserved. 5 * 6 * This software was developed for the FreeBSD Project by Poul-Henning Kamp 7 * and NAI Labs, the Security Research Division of Network Associates, Inc. 8 * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the 9 * DARPA CHATS research program. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * $FreeBSD: head/sys/geom/bde/g_bde.c 238198 2012-07-07 17:09:44Z trasz $ 33 * 34 */ 35 36#include <sys/param.h> 37#include <sys/bio.h> 38#include <sys/lock.h> 39#include <sys/mutex.h> 40#include <sys/malloc.h> 41#include <sys/systm.h> 42#include <sys/kernel.h> 43#include <sys/kthread.h> 44#include <sys/sysctl.h> 45 46#include <crypto/rijndael/rijndael-api-fst.h> 47#include <crypto/sha2/sha2.h> 48#include <geom/geom.h> 49#include <geom/bde/g_bde.h> 50#define BDE_CLASS_NAME "BDE" 51 52FEATURE(geom_bde, "GEOM-based Disk Encryption"); 53 54static void 55g_bde_start(struct bio *bp) 56{ 57 58 switch (bp->bio_cmd) { 59 case BIO_DELETE: 60 case BIO_READ: 61 case BIO_WRITE: 62 g_bde_start1(bp); 63 break; 64 case BIO_GETATTR: 65 g_io_deliver(bp, EOPNOTSUPP); 66 break; 67 default: 68 g_io_deliver(bp, EOPNOTSUPP); 69 return; 70 } 71 return; 72} 73 74static void 75g_bde_orphan(struct g_consumer *cp) 76{ 77 struct g_geom *gp; 78 struct g_provider *pp; 79 struct g_bde_softc *sc; 80 81 g_trace(G_T_TOPOLOGY, "g_bde_orphan(%p/%s)", cp, cp->provider->name); 82 g_topology_assert(); 83 84 gp = cp->geom; 85 sc = gp->softc; 86 gp->flags |= G_GEOM_WITHER; 87 LIST_FOREACH(pp, &gp->provider, provider) 88 g_orphan_provider(pp, ENXIO); 89 bzero(sc, sizeof(struct g_bde_softc)); /* destroy evidence */ 90 return; 91} 92 93static int 94g_bde_access(struct g_provider *pp, int dr, int dw, int de) 95{ 96 struct g_geom *gp; 97 struct g_consumer *cp; 98 99 gp = pp->geom; 100 cp = LIST_FIRST(&gp->consumer); 101 if (cp->acr == 0 && cp->acw == 0 && cp->ace == 0) { 102 de++; 103 dr++; 104 } 105 /* ... and let go of it on last close */ 106 if ((cp->acr + dr) == 0 && (cp->acw + dw) == 0 && (cp->ace + de) == 1) { 107 de--; 108 dr--; 109 } 110 return (g_access(cp, dr, dw, de)); 111} 112 113static void 114g_bde_create_geom(struct gctl_req *req, struct g_class *mp, struct g_provider *pp) 115{ 116 struct g_geom *gp; 117 struct g_consumer *cp; 118 struct g_bde_key *kp; 119 int error, i; 120 u_int sectorsize; 121 off_t mediasize; 122 struct g_bde_softc *sc; 123 void *pass; 124 void *key; 125 126 g_trace(G_T_TOPOLOGY, "g_bde_create_geom(%s, %s)", mp->name, pp->name); 127 g_topology_assert(); 128 gp = NULL; 129 130 131 gp = g_new_geomf(mp, "%s.bde", pp->name); 132 cp = g_new_consumer(gp); 133 g_attach(cp, pp); 134 error = g_access(cp, 1, 1, 1); 135 if (error) { 136 g_detach(cp); 137 g_destroy_consumer(cp); 138 g_destroy_geom(gp); 139 gctl_error(req, "could not access consumer"); 140 return; 141 } 142 pass = NULL; 143 key = NULL; 144 do { 145 pass = gctl_get_param(req, "pass", &i); 146 if (pass == NULL || i != SHA512_DIGEST_LENGTH) { 147 gctl_error(req, "No usable key presented"); 148 break; 149 } 150 key = gctl_get_param(req, "key", &i); 151 if (key != NULL && i != 16) { 152 gctl_error(req, "Invalid key presented"); 153 break; 154 } 155 sectorsize = cp->provider->sectorsize; 156 mediasize = cp->provider->mediasize; 157 sc = g_malloc(sizeof(struct g_bde_softc), M_WAITOK | M_ZERO); 158 gp->softc = sc; 159 sc->geom = gp; 160 sc->consumer = cp; 161 162 error = g_bde_decrypt_lock(sc, pass, key, 163 mediasize, sectorsize, NULL); 164 bzero(sc->sha2, sizeof sc->sha2); 165 if (error) 166 break; 167 kp = &sc->key; 168 169 /* Initialize helper-fields */ 170 kp->keys_per_sector = kp->sectorsize / G_BDE_SKEYLEN; 171 kp->zone_cont = kp->keys_per_sector * kp->sectorsize; 172 kp->zone_width = kp->zone_cont + kp->sectorsize; 173 kp->media_width = kp->sectorN - kp->sector0 - 174 G_BDE_MAXKEYS * kp->sectorsize; 175 176 /* Our external parameters */ 177 sc->zone_cont = kp->zone_cont; 178 sc->mediasize = g_bde_max_sector(kp); 179 sc->sectorsize = kp->sectorsize; 180 181 TAILQ_INIT(&sc->freelist); 182 TAILQ_INIT(&sc->worklist); 183 mtx_init(&sc->worklist_mutex, "g_bde_worklist", NULL, MTX_DEF); 184 /* XXX: error check */ 185 kproc_create(g_bde_worker, gp, &sc->thread, 0, 0, 186 "g_bde %s", gp->name); 187 pp = g_new_providerf(gp, gp->name); 188#if 0 189 /* 190 * XXX: Disable this for now. Appearantly UFS no longer 191 * XXX: issues BIO_DELETE requests correctly, with the obvious 192 * XXX: outcome that userdata is trashed. 193 */ 194 pp->flags |= G_PF_CANDELETE; 195#endif 196 pp->stripesize = kp->zone_cont; 197 pp->stripeoffset = 0; 198 pp->mediasize = sc->mediasize; 199 pp->sectorsize = sc->sectorsize; 200 g_error_provider(pp, 0); 201 break; 202 } while (0); 203 if (pass != NULL) 204 bzero(pass, SHA512_DIGEST_LENGTH); 205 if (key != NULL) 206 bzero(key, 16); 207 if (error == 0) 208 return; 209 g_access(cp, -1, -1, -1); 210 g_detach(cp); 211 g_destroy_consumer(cp); 212 if (gp->softc != NULL) 213 g_free(gp->softc); 214 g_destroy_geom(gp); 215 return; 216} 217 218 219static int 220g_bde_destroy_geom(struct gctl_req *req, struct g_class *mp, struct g_geom *gp) 221{ 222 struct g_consumer *cp; 223 struct g_provider *pp; 224 struct g_bde_softc *sc; 225 226 g_trace(G_T_TOPOLOGY, "g_bde_destroy_geom(%s, %s)", mp->name, gp->name); 227 g_topology_assert(); 228 /* 229 * Orderly detachment. 230 */ 231 KASSERT(gp != NULL, ("NULL geom")); 232 pp = LIST_FIRST(&gp->provider); 233 KASSERT(pp != NULL, ("NULL provider")); 234 if (pp->acr > 0 || pp->acw > 0 || pp->ace > 0) 235 return (EBUSY); 236 sc = gp->softc; 237 cp = LIST_FIRST(&gp->consumer); 238 KASSERT(cp != NULL, ("NULL consumer")); 239 sc->dead = 1; 240 wakeup(sc); 241 g_access(cp, -1, -1, -1); 242 g_detach(cp); 243 g_destroy_consumer(cp); 244 while (sc->dead != 2 && !LIST_EMPTY(&pp->consumers)) 245 tsleep(sc, PRIBIO, "g_bdedie", hz); 246 mtx_destroy(&sc->worklist_mutex); 247 bzero(&sc->key, sizeof sc->key); 248 g_free(sc); 249 g_wither_geom(gp, ENXIO); 250 return (0); 251} 252 253static void 254g_bde_ctlreq(struct gctl_req *req, struct g_class *mp, char const *verb) 255{ 256 struct g_geom *gp; 257 struct g_provider *pp; 258 259 if (!strcmp(verb, "create geom")) { 260 pp = gctl_get_provider(req, "provider"); 261 if (pp != NULL) 262 g_bde_create_geom(req, mp, pp); 263 } else if (!strcmp(verb, "destroy geom")) { 264 gp = gctl_get_geom(req, mp, "geom"); 265 if (gp != NULL) 266 g_bde_destroy_geom(req, mp, gp); 267 } else { 268 gctl_error(req, "unknown verb"); 269 } 270} 271 272static struct g_class g_bde_class = { 273 .name = BDE_CLASS_NAME, 274 .version = G_VERSION, 275 .destroy_geom = g_bde_destroy_geom, 276 .ctlreq = g_bde_ctlreq, 277 .start = g_bde_start, 278 .orphan = g_bde_orphan, 279 .access = g_bde_access, 280 .spoiled = g_std_spoiled, 281}; 282 283DECLARE_GEOM_CLASS(g_bde_class, g_bde); 284