5afa461402
Replace ARC4 with SHA2-512. Change lock-structure encoding to use random ordering rather for obscurity. Encrypt lock-structure with AES/256 instead of AES/128. Change kkey derivation to be MD5 hash based. Watch for malloc(M_NOWAIT) failures and ditch our cache when they happen. Remove clause 3 of the license with NAI Labs consent. Many thanks to "Lucky Green" <shamrock@cypherpunks.to> and "David Wagner" <daw@cs.berkeley.edu>, for code reading, inputs and suggestions. This code has still not been stared at for 10 years by a gang of hard-core cryptographers. Discretion advised. NB: These changes result in the on-disk format changing: dump/restore needed. Sponsored by: DARPA & NAI Labs.
212 lines
6.5 KiB
C
212 lines
6.5 KiB
C
/*-
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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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* $FreeBSD$
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*/
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#ifndef _SYS_GEOM_BDE_G_BDE_H_
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#define _SYS_GEOM_BDE_G_BDE_H_ 1
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/*
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* These are quite, but not entirely unlike constants.
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*
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* They are not commented in details here, to prevent unadvisable
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* experimentation. Please consult the code where they are used before you
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* even think about modifying these.
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*/
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#define G_BDE_MKEYLEN (2048/8)
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#define G_BDE_SKEYBITS 128
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#define G_BDE_SKEYLEN (G_BDE_SKEYBITS/8)
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#define G_BDE_KKEYBITS 128
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#define G_BDE_KKEYLEN (G_BDE_KKEYBITS/8)
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#define G_BDE_MAXKEYS 4
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#define G_BDE_LOCKSIZE 384
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#define NLOCK_FIELDS 13
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/* This just needs to be "large enough" */
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#define G_BDE_KEYBYTES 304
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struct g_bde_work;
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struct g_bde_softc;
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struct g_bde_sector {
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struct g_bde_work *owner;
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struct g_bde_softc *softc;
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off_t offset;
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u_int size;
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u_int ref;
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void *data;
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TAILQ_ENTRY(g_bde_sector) list;
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u_char valid;
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u_char malloc;
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enum {JUNK, IO, VALID} state;
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int error;
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time_t used;
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};
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struct g_bde_work {
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struct mtx mutex;
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off_t offset;
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off_t length;
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void *data;
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struct bio *bp;
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struct g_bde_softc *softc;
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off_t so;
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off_t kso;
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u_int ko;
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struct g_bde_sector *sp;
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struct g_bde_sector *ksp;
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TAILQ_ENTRY(g_bde_work) list;
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enum {SETUP, WAIT, FINISH} state;
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int error;
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};
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/*
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* The decrypted contents of the lock sectors. Notice that this is not
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* the same as the on-disk layout. The on-disk layout is dynamic and
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* dependent on the pass-phrase.
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*/
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struct g_bde_key {
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uint64_t sector0;
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/* Physical byte offset of 1st byte used */
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uint64_t sectorN;
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/* Physical byte offset of 1st byte not used */
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uint64_t keyoffset;
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/* Number of bytes the disk image is skewed. */
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uint64_t lsector[G_BDE_MAXKEYS];
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/* Physical byte offsets of lock sectors */
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uint32_t sectorsize;
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/* Our "logical" sector size */
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uint32_t flags;
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/* 1 = lockfile in sector 0 */
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uint8_t salt[16];
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/* Used to frustate the kkey generation */
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uint8_t spare[32];
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/* For future use, random contents */
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uint8_t mkey[G_BDE_MKEYLEN];
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/* Our masterkey. */
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/* Non-stored help-fields */
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uint64_t zone_width; /* On-disk width of zone */
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uint64_t zone_cont; /* Payload width of zone */
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uint64_t media_width; /* Non-magic width of zone */
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u_int keys_per_sector;
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};
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struct g_bde_softc {
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off_t mediasize;
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u_int sectorsize;
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uint64_t zone_cont;
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struct g_geom *geom;
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struct g_consumer *consumer;
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TAILQ_HEAD(, g_bde_sector) freelist;
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TAILQ_HEAD(, g_bde_work) worklist;
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struct mtx worklist_mutex;
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struct proc *thread;
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struct g_bde_key key;
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int dead;
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u_int nwork;
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u_int nsect;
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u_int ncache;
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u_char sha2[SHA512_DIGEST_LENGTH];
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};
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/* g_bde_crypt.c */
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void g_bde_crypt_delete(struct g_bde_work *wp);
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void g_bde_crypt_read(struct g_bde_work *wp);
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void g_bde_crypt_write(struct g_bde_work *wp);
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/* g_bde_key.c */
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void g_bde_zap_key(struct g_bde_softc *sc);
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int g_bde_get_key(struct g_bde_softc *sc, void *ptr, int len);
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int g_bde_init_keybytes(struct g_bde_softc *sc, char *passp, int len);
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/* g_bde_lock .c */
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int g_bde_encode_lock(struct g_bde_softc *sc, struct g_bde_key *gl, u_char *ptr);
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int g_bde_decode_lock(struct g_bde_softc *sc, struct g_bde_key *gl, u_char *ptr);
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int g_bde_keyloc_encrypt(struct g_bde_softc *sc, uint64_t *input, void *output);
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int g_bde_keyloc_decrypt(struct g_bde_softc *sc, void *input, uint64_t *output);
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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);
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void g_bde_hash_pass(struct g_bde_softc *sc, const void *input, u_int len);
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/* g_bde_math .c */
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uint64_t g_bde_max_sector(struct g_bde_key *lp);
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void g_bde_map_sector(struct g_bde_key *lp, uint64_t isector, uint64_t *osector, uint64_t *ksector, u_int *koffset);
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/* g_bde_work.c */
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void g_bde_start1(struct bio *bp);
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void g_bde_worker(void *arg);
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/*
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* These four functions wrap the raw Rijndael functions and make sure we
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* explode if something fails which shouldn't.
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*/
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static __inline void
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AES_init(cipherInstance *ci)
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{
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int error;
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error = rijndael_cipherInit(ci, MODE_CBC, NULL);
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KASSERT(error > 0, ("rijndael_cipherInit %d", error));
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}
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static __inline void
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AES_makekey(keyInstance *ki, int dir, u_int len, void *key)
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{
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int error;
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error = rijndael_makeKey(ki, dir, len, key);
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KASSERT(error > 0, ("rijndael_makeKey %d", error));
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}
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static __inline void
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AES_encrypt(cipherInstance *ci, keyInstance *ki, void *in, void *out, u_int len)
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{
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int error;
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error = rijndael_blockEncrypt(ci, ki, in, len * 8, out);
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KASSERT(error > 0, ("rijndael_blockEncrypt %d", error));
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}
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static __inline void
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AES_decrypt(cipherInstance *ci, keyInstance *ki, void *in, void *out, u_int len)
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{
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int error;
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error = rijndael_blockDecrypt(ci, ki, in, len * 8, out);
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KASSERT(error > 0, ("rijndael_blockDecrypt %d", error));
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}
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#endif /* _SYS_GEOM_BDE_G_BDE_H_ */
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