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|
/*-
* Copyright (c) 2005 Pawel Jakub Dawidek <pjd@FreeBSD.org>
* Copyright (c) 2004 Mark R V Murray
* 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.
*/
/* $OpenBSD: via.c,v 1.3 2004/06/15 23:36:55 deraadt Exp $ */
/*-
* Copyright (c) 2003 Jason Wright
* Copyright (c) 2003, 2004 Theo de Raadt
* All rights reserved.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/malloc.h>
#include <sys/libkern.h>
#if defined(__i386__) && !defined(PC98)
#include <machine/cpufunc.h>
#include <machine/cputypes.h>
#include <machine/md_var.h>
#include <machine/specialreg.h>
#endif
#include <opencrypto/cryptodev.h>
#include <opencrypto/cryptosoft.h> /* for hmac_ipad_buffer and hmac_opad_buffer */
#include <opencrypto/xform.h>
#include <crypto/rijndael/rijndael.h>
#define PADLOCK_ROUND_COUNT_AES128 10
#define PADLOCK_ROUND_COUNT_AES192 12
#define PADLOCK_ROUND_COUNT_AES256 14
#define PADLOCK_ALGORITHM_TYPE_AES 0
#define PADLOCK_KEY_GENERATION_HW 0
#define PADLOCK_KEY_GENERATION_SW 1
#define PADLOCK_DIRECTION_ENCRYPT 0
#define PADLOCK_DIRECTION_DECRYPT 1
#define PADLOCK_KEY_SIZE_128 0
#define PADLOCK_KEY_SIZE_192 1
#define PADLOCK_KEY_SIZE_256 2
union padlock_cw {
uint64_t raw;
struct {
u_int round_count : 4;
u_int algorithm_type : 3;
u_int key_generation : 1;
u_int intermediate : 1;
u_int direction : 1;
u_int key_size : 2;
u_int filler0 : 20;
u_int filler1 : 32;
u_int filler2 : 32;
u_int filler3 : 32;
} __field;
};
#define cw_round_count __field.round_count
#define cw_algorithm_type __field.algorithm_type
#define cw_key_generation __field.key_generation
#define cw_intermediate __field.intermediate
#define cw_direction __field.direction
#define cw_key_size __field.key_size
#define cw_filler0 __field.filler0
#define cw_filler1 __field.filler1
#define cw_filler2 __field.filler2
#define cw_filler3 __field.filler3
struct padlock_session {
union padlock_cw ses_cw __aligned(16);
uint32_t ses_ekey[4 * (RIJNDAEL_MAXNR + 1) + 4] __aligned(16); /* 128 bit aligned */
uint32_t ses_dkey[4 * (RIJNDAEL_MAXNR + 1) + 4] __aligned(16); /* 128 bit aligned */
uint8_t ses_iv[16] __aligned(16); /* 128 bit aligned */
struct auth_hash *ses_axf;
uint8_t *ses_ictx;
uint8_t *ses_octx;
int ses_mlen;
int ses_used;
uint32_t ses_id;
TAILQ_ENTRY(padlock_session) ses_next;
};
struct padlock_softc {
int32_t sc_cid;
uint32_t sc_sid;
TAILQ_HEAD(, padlock_session) sc_sessions;
struct mtx sc_sessions_mtx;
};
static struct padlock_softc *padlock_sc;
static int padlock_newsession(void *arg __unused, uint32_t *sidp,
struct cryptoini *cri);
static int padlock_freesession(void *arg __unused, uint64_t tid);
static int padlock_process(void *arg __unused, struct cryptop *crp,
int hint __unused);
static __inline void
padlock_cbc(void *in, void *out, size_t count, void *key, union padlock_cw *cw,
void *iv)
{
#ifdef __GNUCLIKE_ASM
/* The .byte line is really VIA C3 "xcrypt-cbc" instruction */
__asm __volatile(
"pushf \n\t"
"popf \n\t"
"rep \n\t"
".byte 0x0f, 0xa7, 0xd0"
: "+a" (iv), "+c" (count), "+D" (out), "+S" (in)
: "b" (key), "d" (cw)
: "cc", "memory"
);
#endif
}
static int
padlock_init(void)
{
struct padlock_softc *sc;
#if defined(__i386__) && !defined(PC98)
if (!(via_feature_xcrypt & VIA_HAS_AES)) {
printf("PADLOCK: No ACE support.\n");
return (EINVAL);
} else
printf("PADLOCK: HW support loaded.\n");
#else
return (EINVAL);
#endif
padlock_sc = sc = malloc(sizeof(*padlock_sc), M_DEVBUF,
M_WAITOK | M_ZERO);
TAILQ_INIT(&sc->sc_sessions);
sc->sc_sid = 1;
sc->sc_cid = crypto_get_driverid(0);
if (sc->sc_cid < 0) {
printf("PADLOCK: Could not get crypto driver id.\n");
free(padlock_sc, M_DEVBUF);
padlock_sc = NULL;
return (ENOMEM);
}
mtx_init(&sc->sc_sessions_mtx, "padlock_mtx", NULL, MTX_DEF);
crypto_register(sc->sc_cid, CRYPTO_AES_CBC, 0, 0, padlock_newsession,
padlock_freesession, padlock_process, NULL);
crypto_register(sc->sc_cid, CRYPTO_MD5_HMAC, 0, 0, padlock_newsession,
padlock_freesession, padlock_process, NULL);
crypto_register(sc->sc_cid, CRYPTO_SHA1_HMAC, 0, 0, padlock_newsession,
padlock_freesession, padlock_process, NULL);
crypto_register(sc->sc_cid, CRYPTO_RIPEMD160_HMAC, 0, 0,
padlock_newsession, padlock_freesession, padlock_process, NULL);
crypto_register(sc->sc_cid, CRYPTO_SHA2_256_HMAC, 0, 0,
padlock_newsession, padlock_freesession, padlock_process, NULL);
crypto_register(sc->sc_cid, CRYPTO_SHA2_384_HMAC, 0, 0,
padlock_newsession, padlock_freesession, padlock_process, NULL);
crypto_register(sc->sc_cid, CRYPTO_SHA2_512_HMAC, 0, 0,
padlock_newsession, padlock_freesession, padlock_process, NULL);
return (0);
}
static int
padlock_destroy(void)
{
struct padlock_softc *sc = padlock_sc;
struct padlock_session *ses;
u_int active = 0;
if (sc == NULL)
return (0);
mtx_lock(&sc->sc_sessions_mtx);
TAILQ_FOREACH(ses, &sc->sc_sessions, ses_next) {
if (ses->ses_used)
active++;
}
if (active > 0) {
mtx_unlock(&sc->sc_sessions_mtx);
printf("PADLOCK: Cannot destroy, %u sessions active.\n",
active);
return (EBUSY);
}
padlock_sc = NULL;
for (ses = TAILQ_FIRST(&sc->sc_sessions); ses != NULL;
ses = TAILQ_FIRST(&sc->sc_sessions)) {
TAILQ_REMOVE(&sc->sc_sessions, ses, ses_next);
free(ses, M_DEVBUF);
}
mtx_destroy(&sc->sc_sessions_mtx);
crypto_unregister_all(sc->sc_cid);
free(sc, M_DEVBUF);
return (0);
}
static void
padlock_setup_enckey(struct padlock_session *ses, caddr_t key, int klen)
{
union padlock_cw *cw;
int i;
cw = &ses->ses_cw;
if (cw->cw_key_generation == PADLOCK_KEY_GENERATION_SW) {
/* Build expanded keys for both directions */
rijndaelKeySetupEnc(ses->ses_ekey, key, klen);
rijndaelKeySetupDec(ses->ses_dkey, key, klen);
for (i = 0; i < 4 * (RIJNDAEL_MAXNR + 1); i++) {
ses->ses_ekey[i] = ntohl(ses->ses_ekey[i]);
ses->ses_dkey[i] = ntohl(ses->ses_dkey[i]);
}
} else {
bcopy(key, ses->ses_ekey, klen);
bcopy(key, ses->ses_dkey, klen);
}
}
static void
padlock_setup_mackey(struct padlock_session *ses, caddr_t key, int klen)
{
struct auth_hash *axf;
int i;
klen /= 8;
axf = ses->ses_axf;
for (i = 0; i < klen; i++)
key[i] ^= HMAC_IPAD_VAL;
axf->Init(ses->ses_ictx);
axf->Update(ses->ses_ictx, key, klen);
axf->Update(ses->ses_ictx, hmac_ipad_buffer, axf->blocksize - klen);
for (i = 0; i < klen; i++)
key[i] ^= (HMAC_IPAD_VAL ^ HMAC_OPAD_VAL);
axf->Init(ses->ses_octx);
axf->Update(ses->ses_octx, key, klen);
axf->Update(ses->ses_octx, hmac_opad_buffer, axf->blocksize - klen);
for (i = 0; i < klen; i++)
key[i] ^= HMAC_OPAD_VAL;
}
/*
* Compute keyed-hash authenticator.
*/
static int
padlock_authcompute(struct padlock_session *ses, struct cryptodesc *crd,
caddr_t buf, int flags)
{
u_char hash[HASH_MAX_LEN];
struct auth_hash *axf;
union authctx ctx;
int error;
axf = ses->ses_axf;
bcopy(ses->ses_ictx, &ctx, axf->ctxsize);
error = crypto_apply(flags, buf, crd->crd_skip, crd->crd_len,
(int (*)(void *, void *, unsigned int))axf->Update, (caddr_t)&ctx);
if (error != 0)
return (error);
axf->Final(hash, &ctx);
bcopy(ses->ses_octx, &ctx, axf->ctxsize);
axf->Update(&ctx, hash, axf->hashsize);
axf->Final(hash, &ctx);
/* Inject the authentication data */
crypto_copyback(flags, buf, crd->crd_inject,
ses->ses_mlen == 0 ? axf->hashsize : ses->ses_mlen, hash);
return (0);
}
static int
padlock_newsession(void *arg __unused, uint32_t *sidp, struct cryptoini *cri)
{
struct padlock_softc *sc = padlock_sc;
struct padlock_session *ses = NULL;
struct cryptoini *encini, *macini;
union padlock_cw *cw;
if (sc == NULL || sidp == NULL || cri == NULL)
return (EINVAL);
encini = macini = NULL;
for (; cri != NULL; cri = cri->cri_next) {
switch (cri->cri_alg) {
case CRYPTO_NULL_HMAC:
case CRYPTO_MD5_HMAC:
case CRYPTO_SHA1_HMAC:
case CRYPTO_RIPEMD160_HMAC:
case CRYPTO_SHA2_256_HMAC:
case CRYPTO_SHA2_384_HMAC:
case CRYPTO_SHA2_512_HMAC:
if (macini != NULL)
return (EINVAL);
macini = cri;
break;
case CRYPTO_AES_CBC:
if (encini != NULL)
return (EINVAL);
encini = cri;
break;
default:
return (EINVAL);
}
}
/*
* We only support HMAC algorithms to be able to work with
* fast_ipsec(4), so if we are asked only for authentication without
* encryption, don't pretend we can accellerate it.
*/
if (encini == NULL)
return (EINVAL);
if (encini->cri_klen != 128 && encini->cri_klen != 192 &&
encini->cri_klen != 256) {
return (EINVAL);
}
/*
* Let's look for a free session structure.
*/
mtx_lock(&sc->sc_sessions_mtx);
/*
* Free sessions goes first, so if first session is used, we need to
* allocate one.
*/
ses = TAILQ_FIRST(&sc->sc_sessions);
if (ses == NULL || ses->ses_used)
ses = NULL;
else {
TAILQ_REMOVE(&sc->sc_sessions, ses, ses_next);
ses->ses_used = 1;
TAILQ_INSERT_TAIL(&sc->sc_sessions, ses, ses_next);
}
mtx_unlock(&sc->sc_sessions_mtx);
if (ses == NULL) {
ses = malloc(sizeof(*ses), M_DEVBUF, M_NOWAIT | M_ZERO);
if (ses == NULL)
return (ENOMEM);
ses->ses_used = 1;
mtx_lock(&sc->sc_sessions_mtx);
ses->ses_id = sc->sc_sid++;
TAILQ_INSERT_TAIL(&sc->sc_sessions, ses, ses_next);
mtx_unlock(&sc->sc_sessions_mtx);
}
cw = &ses->ses_cw;
bzero(cw, sizeof(*cw));
cw->cw_algorithm_type = PADLOCK_ALGORITHM_TYPE_AES;
cw->cw_key_generation = PADLOCK_KEY_GENERATION_SW;
cw->cw_intermediate = 0;
switch (encini->cri_klen) {
case 128:
cw->cw_round_count = PADLOCK_ROUND_COUNT_AES128;
cw->cw_key_size = PADLOCK_KEY_SIZE_128;
#ifdef HW_KEY_GENERATION
/* This doesn't buy us much, that's why it is commented out. */
cw->cw_key_generation = PADLOCK_KEY_GENERATION_HW;
#endif
break;
case 192:
cw->cw_round_count = PADLOCK_ROUND_COUNT_AES192;
cw->cw_key_size = PADLOCK_KEY_SIZE_192;
break;
case 256:
cw->cw_round_count = PADLOCK_ROUND_COUNT_AES256;
cw->cw_key_size = PADLOCK_KEY_SIZE_256;
break;
}
if (encini->cri_key != NULL)
padlock_setup_enckey(ses, encini->cri_key, encini->cri_klen);
arc4rand(ses->ses_iv, sizeof(ses->ses_iv), 0);
if (macini != NULL) {
ses->ses_mlen = macini->cri_mlen;
/* Find software structure which describes HMAC algorithm. */
switch (macini->cri_alg) {
case CRYPTO_NULL_HMAC:
ses->ses_axf = &auth_hash_null;
break;
case CRYPTO_MD5_HMAC:
ses->ses_axf = &auth_hash_hmac_md5;
break;
case CRYPTO_SHA1_HMAC:
ses->ses_axf = &auth_hash_hmac_sha1;
break;
case CRYPTO_RIPEMD160_HMAC:
ses->ses_axf = &auth_hash_hmac_ripemd_160;
break;
case CRYPTO_SHA2_256_HMAC:
ses->ses_axf = &auth_hash_hmac_sha2_256;
break;
case CRYPTO_SHA2_384_HMAC:
ses->ses_axf = &auth_hash_hmac_sha2_384;
break;
case CRYPTO_SHA2_512_HMAC:
ses->ses_axf = &auth_hash_hmac_sha2_512;
break;
}
/* Allocate memory for HMAC inner and outer contexts. */
ses->ses_ictx = malloc(ses->ses_axf->ctxsize, M_CRYPTO_DATA,
M_NOWAIT);
ses->ses_octx = malloc(ses->ses_axf->ctxsize, M_CRYPTO_DATA,
M_NOWAIT);
if (ses->ses_ictx == NULL || ses->ses_octx == NULL) {
padlock_freesession(NULL, ses->ses_id);
return (ENOMEM);
}
/* Setup key if given. */
if (macini->cri_key != NULL) {
padlock_setup_mackey(ses, macini->cri_key,
macini->cri_klen);
}
}
*sidp = ses->ses_id;
return (0);
}
static int
padlock_freesession(void *arg __unused, uint64_t tid)
{
struct padlock_softc *sc = padlock_sc;
struct padlock_session *ses;
uint32_t sid = ((uint32_t)tid) & 0xffffffff;
if (sc == NULL)
return (EINVAL);
mtx_lock(&sc->sc_sessions_mtx);
TAILQ_FOREACH(ses, &sc->sc_sessions, ses_next) {
if (ses->ses_id == sid)
break;
}
if (ses == NULL) {
mtx_unlock(&sc->sc_sessions_mtx);
return (EINVAL);
}
TAILQ_REMOVE(&sc->sc_sessions, ses, ses_next);
if (ses->ses_ictx != NULL) {
bzero(ses->ses_ictx, sizeof(ses->ses_ictx));
free(ses->ses_ictx, M_CRYPTO_DATA);
}
if (ses->ses_octx != NULL) {
bzero(ses->ses_octx, sizeof(ses->ses_octx));
free(ses->ses_octx, M_CRYPTO_DATA);
}
bzero(ses, sizeof(ses));
ses->ses_used = 0;
TAILQ_INSERT_TAIL(&sc->sc_sessions, ses, ses_next);
mtx_unlock(&sc->sc_sessions_mtx);
return (0);
}
static int
padlock_process(void *arg __unused, struct cryptop *crp, int hint __unused)
{
struct padlock_softc *sc = padlock_sc;
struct padlock_session *ses;
union padlock_cw *cw;
struct cryptodesc *crd, *enccrd, *maccrd;
uint32_t *key;
u_char *buf, *abuf;
int error = 0;
enccrd = maccrd = NULL;
buf = NULL;
if (crp == NULL || crp->crp_callback == NULL || crp->crp_desc == NULL) {
error = EINVAL;
goto out;
}
for (crd = crp->crp_desc; crd != NULL; crd = crd->crd_next) {
switch (crd->crd_alg) {
case CRYPTO_NULL_HMAC:
case CRYPTO_MD5_HMAC:
case CRYPTO_SHA1_HMAC:
case CRYPTO_RIPEMD160_HMAC:
case CRYPTO_SHA2_256_HMAC:
case CRYPTO_SHA2_384_HMAC:
case CRYPTO_SHA2_512_HMAC:
if (maccrd != NULL) {
error = EINVAL;
goto out;
}
maccrd = crd;
break;
case CRYPTO_AES_CBC:
if (enccrd != NULL) {
error = EINVAL;
goto out;
}
enccrd = crd;
break;
default:
return (EINVAL);
}
}
if (enccrd == NULL || (enccrd->crd_len % AES_BLOCK_LEN) != 0) {
error = EINVAL;
goto out;
}
mtx_lock(&sc->sc_sessions_mtx);
TAILQ_FOREACH(ses, &sc->sc_sessions, ses_next) {
if (ses->ses_id == (crp->crp_sid & 0xffffffff))
break;
}
mtx_unlock(&sc->sc_sessions_mtx);
if (ses == NULL) {
error = EINVAL;
goto out;
}
buf = malloc(enccrd->crd_len + 16, M_DEVBUF, M_NOWAIT);
if (buf == NULL) {
error = ENOMEM;
goto out;
}
/* Buffer has to be 16 bytes aligned. */
abuf = buf + 16 - ((uintptr_t)buf % 16);
if ((enccrd->crd_flags & CRD_F_KEY_EXPLICIT) != 0)
padlock_setup_enckey(ses, enccrd->crd_key, enccrd->crd_klen);
if (maccrd != NULL && (maccrd->crd_flags & CRD_F_KEY_EXPLICIT) != 0)
padlock_setup_mackey(ses, maccrd->crd_key, maccrd->crd_klen);
cw = &ses->ses_cw;
cw->cw_filler0 = 0;
cw->cw_filler1 = 0;
cw->cw_filler2 = 0;
cw->cw_filler3 = 0;
if ((enccrd->crd_flags & CRD_F_ENCRYPT) != 0) {
cw->cw_direction = PADLOCK_DIRECTION_ENCRYPT;
key = ses->ses_ekey;
if ((enccrd->crd_flags & CRD_F_IV_EXPLICIT) != 0)
bcopy(enccrd->crd_iv, ses->ses_iv, 16);
if ((enccrd->crd_flags & CRD_F_IV_PRESENT) == 0) {
crypto_copyback(crp->crp_flags, crp->crp_buf,
enccrd->crd_inject, AES_BLOCK_LEN, ses->ses_iv);
}
} else {
cw->cw_direction = PADLOCK_DIRECTION_DECRYPT;
key = ses->ses_dkey;
if ((enccrd->crd_flags & CRD_F_IV_EXPLICIT) != 0)
bcopy(enccrd->crd_iv, ses->ses_iv, AES_BLOCK_LEN);
else {
crypto_copydata(crp->crp_flags, crp->crp_buf,
enccrd->crd_inject, AES_BLOCK_LEN, ses->ses_iv);
}
}
/* Perform data authentication if requested before encryption. */
if (maccrd != NULL && maccrd->crd_next == enccrd) {
error = padlock_authcompute(ses, maccrd, crp->crp_buf,
crp->crp_flags);
if (error != 0)
goto out;
}
crypto_copydata(crp->crp_flags, crp->crp_buf, enccrd->crd_skip,
enccrd->crd_len, abuf);
padlock_cbc(abuf, abuf, enccrd->crd_len / 16, key, cw, ses->ses_iv);
crypto_copyback(crp->crp_flags, crp->crp_buf, enccrd->crd_skip,
enccrd->crd_len, abuf);
/* Perform data authentication if requested after encryption. */
if (maccrd != NULL && enccrd->crd_next == maccrd) {
error = padlock_authcompute(ses, maccrd, crp->crp_buf,
crp->crp_flags);
if (error != 0)
goto out;
}
/* copy out last block for use as next session IV */
if ((enccrd->crd_flags & CRD_F_ENCRYPT) != 0) {
crypto_copydata(crp->crp_flags, crp->crp_buf,
enccrd->crd_skip + enccrd->crd_len - AES_BLOCK_LEN,
AES_BLOCK_LEN, ses->ses_iv);
}
out:
if (buf != NULL) {
bzero(buf, enccrd->crd_len + 16);
free(buf, M_DEVBUF);
}
crp->crp_etype = error;
crypto_done(crp);
return (error);
}
static int
padlock_modevent(module_t mod, int type, void *unused __unused)
{
int error;
error = EOPNOTSUPP;
switch (type) {
case MOD_LOAD:
error = padlock_init();
break;
case MOD_UNLOAD:
error = padlock_destroy();
break;
}
return (error);
}
static moduledata_t padlock_mod = {
"padlock",
padlock_modevent,
0
};
DECLARE_MODULE(padlock, padlock_mod, SI_SUB_DRIVERS, SI_ORDER_ANY);
MODULE_VERSION(padlock, 1);
MODULE_DEPEND(padlock, crypto, 1, 1, 1);
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