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/*-
* Copyright (c) 2002 Poul-Henning Kamp
* Copyright (c) 2002 Networks Associates Technology, Inc.
* All rights reserved.
*
* This software was developed for the FreeBSD Project by Poul-Henning Kamp
* and NAI Labs, the Security Research Division of Network Associates, Inc.
* under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
* DARPA CHATS research program.
*
* 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 AUTHOR 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 AUTHOR 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.
*
* $FreeBSD$
*/
#ifndef _SYS_GEOM_BDE_G_BDE_H_
#define _SYS_GEOM_BDE_G_BDE_H_ 1
/*
* These are quite, but not entirely unlike constants.
*
* They are not commented in details here, to prevent unadvisable
* experimentation. Please consult the code where they are used before you
* even think about modifying these.
*/
#define G_BDE_MKEYLEN (2048/8)
#define G_BDE_SKEYBITS 128
#define G_BDE_SKEYLEN (G_BDE_SKEYBITS/8)
#define G_BDE_KKEYBITS 128
#define G_BDE_KKEYLEN (G_BDE_KKEYBITS/8)
#define G_BDE_MAXKEYS 4
#define G_BDE_LOCKSIZE 384
#define NLOCK_FIELDS 13
/* This just needs to be "large enough" */
#define G_BDE_KEYBYTES 304
struct g_bde_work;
struct g_bde_softc;
struct g_bde_sector {
struct g_bde_work *owner;
struct g_bde_softc *softc;
off_t offset;
u_int size;
u_int ref;
void *data;
TAILQ_ENTRY(g_bde_sector) list;
u_char valid;
u_char malloc;
enum {JUNK, IO, VALID} state;
int error;
time_t used;
};
struct g_bde_work {
struct mtx mutex;
off_t offset;
off_t length;
void *data;
struct bio *bp;
struct g_bde_softc *softc;
off_t so;
off_t kso;
u_int ko;
struct g_bde_sector *sp;
struct g_bde_sector *ksp;
TAILQ_ENTRY(g_bde_work) list;
enum {SETUP, WAIT, FINISH} state;
int error;
};
/*
* The decrypted contents of the lock sectors. Notice that this is not
* the same as the on-disk layout. The on-disk layout is dynamic and
* dependent on the pass-phrase.
*/
struct g_bde_key {
uint64_t sector0;
/* Physical byte offset of 1st byte used */
uint64_t sectorN;
/* Physical byte offset of 1st byte not used */
uint64_t keyoffset;
/* Number of bytes the disk image is skewed. */
uint64_t lsector[G_BDE_MAXKEYS];
/* Physical byte offsets of lock sectors */
uint32_t sectorsize;
/* Our "logical" sector size */
uint32_t flags;
#define GBDE_F_SECT0 1
uint8_t salt[16];
/* Used to frustate the kkey generation */
uint8_t spare[32];
/* For future use, random contents */
uint8_t mkey[G_BDE_MKEYLEN];
/* Our masterkey. */
/* Non-stored help-fields */
uint64_t zone_width; /* On-disk width of zone */
uint64_t zone_cont; /* Payload width of zone */
uint64_t media_width; /* Non-magic width of zone */
u_int keys_per_sector;
};
struct g_bde_softc {
off_t mediasize;
u_int sectorsize;
uint64_t zone_cont;
struct g_geom *geom;
struct g_consumer *consumer;
TAILQ_HEAD(, g_bde_sector) freelist;
TAILQ_HEAD(, g_bde_work) worklist;
struct mtx worklist_mutex;
struct proc *thread;
struct g_bde_key key;
int dead;
u_int nwork;
u_int nsect;
u_int ncache;
u_char sha2[SHA512_DIGEST_LENGTH];
};
/* g_bde_crypt.c */
void g_bde_crypt_delete(struct g_bde_work *wp);
void g_bde_crypt_read(struct g_bde_work *wp);
void g_bde_crypt_write(struct g_bde_work *wp);
/* g_bde_key.c */
void g_bde_zap_key(struct g_bde_softc *sc);
int g_bde_get_key(struct g_bde_softc *sc, void *ptr, int len);
int g_bde_init_keybytes(struct g_bde_softc *sc, char *passp, int len);
/* g_bde_lock .c */
int g_bde_encode_lock(u_char *sha2, struct g_bde_key *gl, u_char *ptr);
int g_bde_decode_lock(struct g_bde_softc *sc, struct g_bde_key *gl, u_char *ptr);
int g_bde_keyloc_encrypt(u_char *sha2, uint64_t v0, uint64_t v1, void *output);
int g_bde_keyloc_decrypt(u_char *sha2, void *input, uint64_t *output);
int g_bde_decrypt_lock(struct g_bde_softc *sc, u_char *keymat, u_char *meta, off_t mediasize, u_int sectorsize, u_int *nkey);
void g_bde_hash_pass(struct g_bde_softc *sc, const void *input, u_int len);
/* g_bde_math .c */
uint64_t g_bde_max_sector(struct g_bde_key *lp);
void g_bde_map_sector(struct g_bde_work *wp);
/* g_bde_work.c */
void g_bde_start1(struct bio *bp);
void g_bde_worker(void *arg);
/*
* These four functions wrap the raw Rijndael functions and make sure we
* explode if something fails which shouldn't.
*/
static __inline void
AES_init(cipherInstance *ci)
{
int error;
error = rijndael_cipherInit(ci, MODE_CBC, NULL);
KASSERT(error > 0, ("rijndael_cipherInit %d", error));
}
static __inline void
AES_makekey(keyInstance *ki, int dir, u_int len, const void *key)
{
int error;
error = rijndael_makeKey(ki, dir, len, key);
KASSERT(error > 0, ("rijndael_makeKey %d", error));
}
static __inline void
AES_encrypt(cipherInstance *ci, keyInstance *ki, const void *in, void *out, u_int len)
{
int error;
error = rijndael_blockEncrypt(ci, ki, in, len * 8, out);
KASSERT(error > 0, ("rijndael_blockEncrypt %d", error));
}
static __inline void
AES_decrypt(cipherInstance *ci, keyInstance *ki, const void *in, void *out, u_int len)
{
int error;
error = rijndael_blockDecrypt(ci, ki, in, len * 8, out);
KASSERT(error > 0, ("rijndael_blockDecrypt %d", error));
}
#endif /* _SYS_GEOM_BDE_G_BDE_H_ */
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