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freebsd-skq/sys/opencrypto/cryptodev.c
John Baldwin 5ac518b51f Add stricter checking on mac key lengths. 
Negative lengths are always invalid.  The key length should also
be zero for hash algorithms that do not accept a key.

admbugs:	949
Reported by:	Yuval Kanarenstein <yuvalk@ssd-disclosure.com>
Reviewed by:	cem
MFC after:	1 week
Sponsored by:	Chelsio Communications
Differential Revision:	https://reviews.freebsd.org/D23094
2020-01-09 18:29:59 +00:00

1551 lines
36 KiB
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/* $OpenBSD: cryptodev.c,v 1.52 2002/06/19 07:22:46 deraadt Exp $ */
/*-
* Copyright (c) 2001 Theo de Raadt
* Copyright (c) 2002-2006 Sam Leffler, Errno Consulting
* Copyright (c) 2014 The FreeBSD Foundation
* All rights reserved.
*
* Portions of this software were developed by John-Mark Gurney
* under sponsorship of the FreeBSD Foundation and
* Rubicon Communications, LLC (Netgate).
*
* 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.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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.
*
* Effort sponsored in part by the Defense Advanced Research Projects
* Agency (DARPA) and Air Force Research Laboratory, Air Force
* Materiel Command, USAF, under agreement number F30602-01-2-0537.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/sysctl.h>
#include <sys/file.h>
#include <sys/filedesc.h>
#include <sys/errno.h>
#include <sys/uio.h>
#include <sys/random.h>
#include <sys/conf.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/fcntl.h>
#include <sys/bus.h>
#include <sys/user.h>
#include <sys/sdt.h>
#include <opencrypto/cryptodev.h>
#include <opencrypto/xform.h>
SDT_PROVIDER_DECLARE(opencrypto);
SDT_PROBE_DEFINE1(opencrypto, dev, ioctl, error, "int"/*line number*/);
#ifdef COMPAT_FREEBSD32
#include <sys/mount.h>
#include <compat/freebsd32/freebsd32.h>
struct session_op32 {
u_int32_t cipher;
u_int32_t mac;
u_int32_t keylen;
u_int32_t key;
int mackeylen;
u_int32_t mackey;
u_int32_t ses;
};
struct session2_op32 {
u_int32_t cipher;
u_int32_t mac;
u_int32_t keylen;
u_int32_t key;
int mackeylen;
u_int32_t mackey;
u_int32_t ses;
int crid;
int pad[4];
};
struct crypt_op32 {
u_int32_t ses;
u_int16_t op;
u_int16_t flags;
u_int len;
u_int32_t src, dst;
u_int32_t mac;
u_int32_t iv;
};
struct crparam32 {
u_int32_t crp_p;
u_int crp_nbits;
};
struct crypt_kop32 {
u_int crk_op;
u_int crk_status;
u_short crk_iparams;
u_short crk_oparams;
u_int crk_crid;
struct crparam32 crk_param[CRK_MAXPARAM];
};
struct cryptotstat32 {
struct timespec32 acc;
struct timespec32 min;
struct timespec32 max;
u_int32_t count;
};
struct cryptostats32 {
u_int32_t cs_ops;
u_int32_t cs_errs;
u_int32_t cs_kops;
u_int32_t cs_kerrs;
u_int32_t cs_intrs;
u_int32_t cs_rets;
u_int32_t cs_blocks;
u_int32_t cs_kblocks;
struct cryptotstat32 cs_invoke;
struct cryptotstat32 cs_done;
struct cryptotstat32 cs_cb;
struct cryptotstat32 cs_finis;
};
#define CIOCGSESSION32 _IOWR('c', 101, struct session_op32)
#define CIOCCRYPT32 _IOWR('c', 103, struct crypt_op32)
#define CIOCKEY32 _IOWR('c', 104, struct crypt_kop32)
#define CIOCGSESSION232 _IOWR('c', 106, struct session2_op32)
#define CIOCKEY232 _IOWR('c', 107, struct crypt_kop32)
static void
session_op_from_32(const struct session_op32 *from, struct session_op *to)
{
CP(*from, *to, cipher);
CP(*from, *to, mac);
CP(*from, *to, keylen);
PTRIN_CP(*from, *to, key);
CP(*from, *to, mackeylen);
PTRIN_CP(*from, *to, mackey);
CP(*from, *to, ses);
}
static void
session2_op_from_32(const struct session2_op32 *from, struct session2_op *to)
{
session_op_from_32((const struct session_op32 *)from,
(struct session_op *)to);
CP(*from, *to, crid);
}
static void
session_op_to_32(const struct session_op *from, struct session_op32 *to)
{
CP(*from, *to, cipher);
CP(*from, *to, mac);
CP(*from, *to, keylen);
PTROUT_CP(*from, *to, key);
CP(*from, *to, mackeylen);
PTROUT_CP(*from, *to, mackey);
CP(*from, *to, ses);
}
static void
session2_op_to_32(const struct session2_op *from, struct session2_op32 *to)
{
session_op_to_32((const struct session_op *)from,
(struct session_op32 *)to);
CP(*from, *to, crid);
}
static void
crypt_op_from_32(const struct crypt_op32 *from, struct crypt_op *to)
{
CP(*from, *to, ses);
CP(*from, *to, op);
CP(*from, *to, flags);
CP(*from, *to, len);
PTRIN_CP(*from, *to, src);
PTRIN_CP(*from, *to, dst);
PTRIN_CP(*from, *to, mac);
PTRIN_CP(*from, *to, iv);
}
static void
crypt_op_to_32(const struct crypt_op *from, struct crypt_op32 *to)
{
CP(*from, *to, ses);
CP(*from, *to, op);
CP(*from, *to, flags);
CP(*from, *to, len);
PTROUT_CP(*from, *to, src);
PTROUT_CP(*from, *to, dst);
PTROUT_CP(*from, *to, mac);
PTROUT_CP(*from, *to, iv);
}
static void
crparam_from_32(const struct crparam32 *from, struct crparam *to)
{
PTRIN_CP(*from, *to, crp_p);
CP(*from, *to, crp_nbits);
}
static void
crparam_to_32(const struct crparam *from, struct crparam32 *to)
{
PTROUT_CP(*from, *to, crp_p);
CP(*from, *to, crp_nbits);
}
static void
crypt_kop_from_32(const struct crypt_kop32 *from, struct crypt_kop *to)
{
int i;
CP(*from, *to, crk_op);
CP(*from, *to, crk_status);
CP(*from, *to, crk_iparams);
CP(*from, *to, crk_oparams);
CP(*from, *to, crk_crid);
for (i = 0; i < CRK_MAXPARAM; i++)
crparam_from_32(&from->crk_param[i], &to->crk_param[i]);
}
static void
crypt_kop_to_32(const struct crypt_kop *from, struct crypt_kop32 *to)
{
int i;
CP(*from, *to, crk_op);
CP(*from, *to, crk_status);
CP(*from, *to, crk_iparams);
CP(*from, *to, crk_oparams);
CP(*from, *to, crk_crid);
for (i = 0; i < CRK_MAXPARAM; i++)
crparam_to_32(&from->crk_param[i], &to->crk_param[i]);
}
#endif
struct csession {
TAILQ_ENTRY(csession) next;
crypto_session_t cses;
volatile u_int refs;
u_int32_t ses;
struct mtx lock; /* for op submission */
u_int32_t cipher;
struct enc_xform *txform;
u_int32_t mac;
struct auth_hash *thash;
caddr_t key;
int keylen;
caddr_t mackey;
int mackeylen;
};
struct cryptop_data {
struct csession *cse;
struct iovec iovec[1];
struct uio uio;
bool done;
};
struct fcrypt {
TAILQ_HEAD(csessionlist, csession) csessions;
int sesn;
struct mtx lock;
};
static struct timeval warninterval = { .tv_sec = 60, .tv_usec = 0 };
SYSCTL_TIMEVAL_SEC(_kern, OID_AUTO, cryptodev_warn_interval, CTLFLAG_RW,
&warninterval,
"Delay in seconds between warnings of deprecated /dev/crypto algorithms");
static int cryptof_ioctl(struct file *, u_long, void *,
struct ucred *, struct thread *);
static int cryptof_stat(struct file *, struct stat *,
struct ucred *, struct thread *);
static int cryptof_close(struct file *, struct thread *);
static int cryptof_fill_kinfo(struct file *, struct kinfo_file *,
struct filedesc *);
static struct fileops cryptofops = {
.fo_read = invfo_rdwr,
.fo_write = invfo_rdwr,
.fo_truncate = invfo_truncate,
.fo_ioctl = cryptof_ioctl,
.fo_poll = invfo_poll,
.fo_kqfilter = invfo_kqfilter,
.fo_stat = cryptof_stat,
.fo_close = cryptof_close,
.fo_chmod = invfo_chmod,
.fo_chown = invfo_chown,
.fo_sendfile = invfo_sendfile,
.fo_fill_kinfo = cryptof_fill_kinfo,
};
static struct csession *csefind(struct fcrypt *, u_int);
static bool csedelete(struct fcrypt *, u_int);
static struct csession *csecreate(struct fcrypt *, crypto_session_t, caddr_t,
u_int64_t, caddr_t, u_int64_t, u_int32_t, u_int32_t, struct enc_xform *,
struct auth_hash *);
static void csefree(struct csession *);
static int cryptodev_op(struct csession *, struct crypt_op *,
struct ucred *, struct thread *td);
static int cryptodev_aead(struct csession *, struct crypt_aead *,
struct ucred *, struct thread *);
static int cryptodev_key(struct crypt_kop *);
static int cryptodev_find(struct crypt_find_op *);
/*
* Check a crypto identifier to see if it requested
* a software device/driver. This can be done either
* by device name/class or through search constraints.
*/
static int
checkforsoftware(int *cridp)
{
int crid;
crid = *cridp;
if (!crypto_devallowsoft) {
if (crid & CRYPTOCAP_F_SOFTWARE) {
if (crid & CRYPTOCAP_F_HARDWARE) {
*cridp = CRYPTOCAP_F_HARDWARE;
return 0;
}
return EINVAL;
}
if ((crid & CRYPTOCAP_F_HARDWARE) == 0 &&
(crypto_getcaps(crid) & CRYPTOCAP_F_HARDWARE) == 0)
return EINVAL;
}
return 0;
}
/* ARGSUSED */
static int
cryptof_ioctl(
struct file *fp,
u_long cmd,
void *data,
struct ucred *active_cred,
struct thread *td)
{
#define SES2(p) ((struct session2_op *)p)
struct cryptoini cria, crie;
struct fcrypt *fcr = fp->f_data;
struct csession *cse;
struct session_op *sop;
struct crypt_op *cop;
struct crypt_aead *caead;
struct enc_xform *txform = NULL;
struct auth_hash *thash = NULL;
struct crypt_kop *kop;
crypto_session_t cses;
u_int32_t ses;
int error = 0, crid;
#ifdef COMPAT_FREEBSD32
struct session2_op sopc;
struct crypt_op copc;
struct crypt_kop kopc;
#endif
switch (cmd) {
case CIOCGSESSION:
case CIOCGSESSION2:
#ifdef COMPAT_FREEBSD32
case CIOCGSESSION32:
case CIOCGSESSION232:
if (cmd == CIOCGSESSION32) {
session_op_from_32(data, (struct session_op *)&sopc);
sop = (struct session_op *)&sopc;
} else if (cmd == CIOCGSESSION232) {
session2_op_from_32(data, &sopc);
sop = (struct session_op *)&sopc;
} else
#endif
sop = (struct session_op *)data;
switch (sop->cipher) {
case 0:
break;
case CRYPTO_DES_CBC:
txform = &enc_xform_des;
break;
case CRYPTO_3DES_CBC:
txform = &enc_xform_3des;
break;
case CRYPTO_BLF_CBC:
txform = &enc_xform_blf;
break;
case CRYPTO_CAST_CBC:
txform = &enc_xform_cast5;
break;
case CRYPTO_SKIPJACK_CBC:
txform = &enc_xform_skipjack;
break;
case CRYPTO_AES_CBC:
txform = &enc_xform_rijndael128;
break;
case CRYPTO_AES_XTS:
txform = &enc_xform_aes_xts;
break;
case CRYPTO_NULL_CBC:
txform = &enc_xform_null;
break;
case CRYPTO_ARC4:
txform = &enc_xform_arc4;
break;
case CRYPTO_CAMELLIA_CBC:
txform = &enc_xform_camellia;
break;
case CRYPTO_AES_ICM:
txform = &enc_xform_aes_icm;
break;
case CRYPTO_AES_NIST_GCM_16:
txform = &enc_xform_aes_nist_gcm;
break;
case CRYPTO_CHACHA20:
txform = &enc_xform_chacha20;
break;
case CRYPTO_AES_CCM_16:
txform = &enc_xform_ccm;
break;
default:
CRYPTDEB("invalid cipher");
SDT_PROBE1(opencrypto, dev, ioctl, error, __LINE__);
return (EINVAL);
}
switch (sop->mac) {
case 0:
break;
case CRYPTO_MD5_HMAC:
thash = &auth_hash_hmac_md5;
break;
case CRYPTO_POLY1305:
thash = &auth_hash_poly1305;
break;
case CRYPTO_SHA1_HMAC:
thash = &auth_hash_hmac_sha1;
break;
case CRYPTO_SHA2_224_HMAC:
thash = &auth_hash_hmac_sha2_224;
break;
case CRYPTO_SHA2_256_HMAC:
thash = &auth_hash_hmac_sha2_256;
break;
case CRYPTO_SHA2_384_HMAC:
thash = &auth_hash_hmac_sha2_384;
break;
case CRYPTO_SHA2_512_HMAC:
thash = &auth_hash_hmac_sha2_512;
break;
case CRYPTO_RIPEMD160_HMAC:
thash = &auth_hash_hmac_ripemd_160;
break;
case CRYPTO_AES_128_NIST_GMAC:
thash = &auth_hash_nist_gmac_aes_128;
break;
case CRYPTO_AES_192_NIST_GMAC:
thash = &auth_hash_nist_gmac_aes_192;
break;
case CRYPTO_AES_256_NIST_GMAC:
thash = &auth_hash_nist_gmac_aes_256;
break;
case CRYPTO_AES_CCM_CBC_MAC:
switch (sop->keylen) {
case 16:
thash = &auth_hash_ccm_cbc_mac_128;
break;
case 24:
thash = &auth_hash_ccm_cbc_mac_192;
break;
case 32:
thash = &auth_hash_ccm_cbc_mac_256;
break;
default:
CRYPTDEB("Invalid CBC MAC key size %d",
sop->keylen);
SDT_PROBE1(opencrypto, dev, ioctl,
error, __LINE__);
return (EINVAL);
}
break;
#ifdef notdef
case CRYPTO_MD5:
thash = &auth_hash_md5;
break;
#endif
case CRYPTO_SHA1:
thash = &auth_hash_sha1;
break;
case CRYPTO_SHA2_224:
thash = &auth_hash_sha2_224;
break;
case CRYPTO_SHA2_256:
thash = &auth_hash_sha2_256;
break;
case CRYPTO_SHA2_384:
thash = &auth_hash_sha2_384;
break;
case CRYPTO_SHA2_512:
thash = &auth_hash_sha2_512;
break;
case CRYPTO_NULL_HMAC:
thash = &auth_hash_null;
break;
case CRYPTO_BLAKE2B:
thash = &auth_hash_blake2b;
break;
case CRYPTO_BLAKE2S:
thash = &auth_hash_blake2s;
break;
default:
CRYPTDEB("invalid mac");
SDT_PROBE1(opencrypto, dev, ioctl, error, __LINE__);
return (EINVAL);
}
bzero(&crie, sizeof(crie));
bzero(&cria, sizeof(cria));
if (txform) {
crie.cri_alg = txform->type;
crie.cri_klen = sop->keylen * 8;
if (sop->keylen > txform->maxkey ||
sop->keylen < txform->minkey) {
CRYPTDEB("invalid cipher parameters");
error = EINVAL;
SDT_PROBE1(opencrypto, dev, ioctl, error,
__LINE__);
goto bail;
}
crie.cri_key = malloc(crie.cri_klen / 8,
M_XDATA, M_WAITOK);
if ((error = copyin(sop->key, crie.cri_key,
crie.cri_klen / 8))) {
CRYPTDEB("invalid key");
SDT_PROBE1(opencrypto, dev, ioctl, error,
__LINE__);
goto bail;
}
if (thash)
crie.cri_next = &cria;
}
if (thash) {
cria.cri_alg = thash->type;
cria.cri_klen = sop->mackeylen * 8;
if (sop->mackeylen > thash->keysize ||
sop->mackeylen < 0) {
CRYPTDEB("invalid mac key length");
error = EINVAL;
SDT_PROBE1(opencrypto, dev, ioctl, error,
__LINE__);
goto bail;
}
if (cria.cri_klen) {
cria.cri_key = malloc(cria.cri_klen / 8,
M_XDATA, M_WAITOK);
if ((error = copyin(sop->mackey, cria.cri_key,
cria.cri_klen / 8))) {
CRYPTDEB("invalid mac key");
SDT_PROBE1(opencrypto, dev, ioctl,
error, __LINE__);
goto bail;
}
}
}
/* NB: CIOCGSESSION2 has the crid */
if (cmd == CIOCGSESSION2
#ifdef COMPAT_FREEBSD32
|| cmd == CIOCGSESSION232
#endif
) {
crid = SES2(sop)->crid;
error = checkforsoftware(&crid);
if (error) {
CRYPTDEB("checkforsoftware");
SDT_PROBE1(opencrypto, dev, ioctl, error,
__LINE__);
goto bail;
}
} else
crid = CRYPTOCAP_F_HARDWARE;
error = crypto_newsession(&cses, (txform ? &crie : &cria), crid);
if (error) {
CRYPTDEB("crypto_newsession");
SDT_PROBE1(opencrypto, dev, ioctl, error, __LINE__);
goto bail;
}
cse = csecreate(fcr, cses, crie.cri_key, crie.cri_klen,
cria.cri_key, cria.cri_klen, sop->cipher, sop->mac, txform,
thash);
if (cse == NULL) {
crypto_freesession(cses);
error = EINVAL;
SDT_PROBE1(opencrypto, dev, ioctl, error, __LINE__);
CRYPTDEB("csecreate");
goto bail;
}
sop->ses = cse->ses;
if (cmd == CIOCGSESSION2
#ifdef COMPAT_FREEBSD32
|| cmd == CIOCGSESSION232
#endif
) {
/* return hardware/driver id */
SES2(sop)->crid = crypto_ses2hid(cse->cses);
}
bail:
if (error) {
if (crie.cri_key)
free(crie.cri_key, M_XDATA);
if (cria.cri_key)
free(cria.cri_key, M_XDATA);
}
#ifdef COMPAT_FREEBSD32
else {
if (cmd == CIOCGSESSION32)
session_op_to_32(sop, data);
else if (cmd == CIOCGSESSION232)
session2_op_to_32((struct session2_op *)sop,
data);
}
#endif
break;
case CIOCFSESSION:
ses = *(u_int32_t *)data;
if (!csedelete(fcr, ses)) {
SDT_PROBE1(opencrypto, dev, ioctl, error, __LINE__);
return (EINVAL);
}
break;
case CIOCCRYPT:
#ifdef COMPAT_FREEBSD32
case CIOCCRYPT32:
if (cmd == CIOCCRYPT32) {
cop = &copc;
crypt_op_from_32(data, cop);
} else
#endif
cop = (struct crypt_op *)data;
cse = csefind(fcr, cop->ses);
if (cse == NULL) {
SDT_PROBE1(opencrypto, dev, ioctl, error, __LINE__);
return (EINVAL);
}
error = cryptodev_op(cse, cop, active_cred, td);
csefree(cse);
#ifdef COMPAT_FREEBSD32
if (error == 0 && cmd == CIOCCRYPT32)
crypt_op_to_32(cop, data);
#endif
break;
case CIOCKEY:
case CIOCKEY2:
#ifdef COMPAT_FREEBSD32
case CIOCKEY32:
case CIOCKEY232:
#endif
if (!crypto_userasymcrypto) {
SDT_PROBE1(opencrypto, dev, ioctl, error, __LINE__);
return (EPERM); /* XXX compat? */
}
#ifdef COMPAT_FREEBSD32
if (cmd == CIOCKEY32 || cmd == CIOCKEY232) {
kop = &kopc;
crypt_kop_from_32(data, kop);
} else
#endif
kop = (struct crypt_kop *)data;
if (cmd == CIOCKEY
#ifdef COMPAT_FREEBSD32
|| cmd == CIOCKEY32
#endif
) {
/* NB: crypto core enforces s/w driver use */
kop->crk_crid =
CRYPTOCAP_F_HARDWARE | CRYPTOCAP_F_SOFTWARE;
}
mtx_lock(&Giant);
error = cryptodev_key(kop);
mtx_unlock(&Giant);
#ifdef COMPAT_FREEBSD32
if (cmd == CIOCKEY32 || cmd == CIOCKEY232)
crypt_kop_to_32(kop, data);
#endif
break;
case CIOCASYMFEAT:
if (!crypto_userasymcrypto) {
/*
* NB: if user asym crypto operations are
* not permitted return "no algorithms"
* so well-behaved applications will just
* fallback to doing them in software.
*/
*(int *)data = 0;
} else {
error = crypto_getfeat((int *)data);
if (error)
SDT_PROBE1(opencrypto, dev, ioctl, error,
__LINE__);
}
break;
case CIOCFINDDEV:
error = cryptodev_find((struct crypt_find_op *)data);
break;
case CIOCCRYPTAEAD:
caead = (struct crypt_aead *)data;
cse = csefind(fcr, caead->ses);
if (cse == NULL) {
SDT_PROBE1(opencrypto, dev, ioctl, error, __LINE__);
return (EINVAL);
}
error = cryptodev_aead(cse, caead, active_cred, td);
csefree(cse);
break;
default:
error = EINVAL;
SDT_PROBE1(opencrypto, dev, ioctl, error, __LINE__);
break;
}
return (error);
#undef SES2
}
static int cryptodev_cb(struct cryptop *);
static struct cryptop_data *
cod_alloc(struct csession *cse, size_t len, struct thread *td)
{
struct cryptop_data *cod;
struct uio *uio;
cod = malloc(sizeof(struct cryptop_data), M_XDATA, M_WAITOK | M_ZERO);
cod->cse = cse;
uio = &cod->uio;
uio->uio_iov = cod->iovec;
uio->uio_iovcnt = 1;
uio->uio_resid = len;
uio->uio_segflg = UIO_SYSSPACE;
uio->uio_rw = UIO_WRITE;
uio->uio_td = td;
uio->uio_iov[0].iov_len = len;
uio->uio_iov[0].iov_base = malloc(len, M_XDATA, M_WAITOK);
return (cod);
}
static void
cod_free(struct cryptop_data *cod)
{
free(cod->uio.uio_iov[0].iov_base, M_XDATA);
free(cod, M_XDATA);
}
static void
cryptodev_warn(struct csession *cse)
{
static struct timeval arc4warn, blfwarn, castwarn, deswarn, md5warn;
static struct timeval skipwarn, tdeswarn;
switch (cse->cipher) {
case CRYPTO_DES_CBC:
if (ratecheck(&deswarn, &warninterval))
gone_in(13, "DES cipher via /dev/crypto");
break;
case CRYPTO_3DES_CBC:
if (ratecheck(&tdeswarn, &warninterval))
gone_in(13, "3DES cipher via /dev/crypto");
break;
case CRYPTO_BLF_CBC:
if (ratecheck(&blfwarn, &warninterval))
gone_in(13, "Blowfish cipher via /dev/crypto");
break;
case CRYPTO_CAST_CBC:
if (ratecheck(&castwarn, &warninterval))
gone_in(13, "CAST128 cipher via /dev/crypto");
break;
case CRYPTO_SKIPJACK_CBC:
if (ratecheck(&skipwarn, &warninterval))
gone_in(13, "Skipjack cipher via /dev/crypto");
break;
case CRYPTO_ARC4:
if (ratecheck(&arc4warn, &warninterval))
gone_in(13, "ARC4 cipher via /dev/crypto");
break;
}
switch (cse->mac) {
case CRYPTO_MD5_HMAC:
if (ratecheck(&md5warn, &warninterval))
gone_in(13, "MD5-HMAC authenticator via /dev/crypto");
break;
}
}
static int
cryptodev_op(
struct csession *cse,
struct crypt_op *cop,
struct ucred *active_cred,
struct thread *td)
{
struct cryptop_data *cod = NULL;
struct cryptop *crp = NULL;
struct cryptodesc *crde = NULL, *crda = NULL;
int error;
if (cop->len > 256*1024-4) {
SDT_PROBE1(opencrypto, dev, ioctl, error, __LINE__);
return (E2BIG);
}
if (cse->txform) {
if (cop->len == 0 || (cop->len % cse->txform->blocksize) != 0) {
SDT_PROBE1(opencrypto, dev, ioctl, error, __LINE__);
return (EINVAL);
}
}
if (cse->thash)
cod = cod_alloc(cse, cop->len + cse->thash->hashsize, td);
else
cod = cod_alloc(cse, cop->len, td);
crp = crypto_getreq((cse->txform != NULL) + (cse->thash != NULL));
if (crp == NULL) {
SDT_PROBE1(opencrypto, dev, ioctl, error, __LINE__);
error = ENOMEM;
goto bail;
}
if (cse->thash && cse->txform) {
if (cop->flags & COP_F_CIPHER_FIRST) {
crde = crp->crp_desc;
crda = crde->crd_next;
} else {
crda = crp->crp_desc;
crde = crda->crd_next;
}
} else if (cse->thash) {
crda = crp->crp_desc;
} else if (cse->txform) {
crde = crp->crp_desc;
} else {
SDT_PROBE1(opencrypto, dev, ioctl, error, __LINE__);
error = EINVAL;
goto bail;
}
if ((error = copyin(cop->src, cod->uio.uio_iov[0].iov_base,
cop->len))) {
SDT_PROBE1(opencrypto, dev, ioctl, error, __LINE__);
goto bail;
}
if (crda) {
crda->crd_skip = 0;
crda->crd_len = cop->len;
crda->crd_inject = cop->len;
crda->crd_alg = cse->mac;
crda->crd_key = cse->mackey;
crda->crd_klen = cse->mackeylen * 8;
}
if (crde) {
if (cop->op == COP_ENCRYPT)
crde->crd_flags |= CRD_F_ENCRYPT;
else
crde->crd_flags &= ~CRD_F_ENCRYPT;
crde->crd_len = cop->len;
crde->crd_inject = 0;
crde->crd_alg = cse->cipher;
crde->crd_key = cse->key;
crde->crd_klen = cse->keylen * 8;
}
crp->crp_ilen = cop->len;
crp->crp_flags = CRYPTO_F_IOV | CRYPTO_F_CBIMM
| (cop->flags & COP_F_BATCH);
crp->crp_uio = &cod->uio;
crp->crp_callback = cryptodev_cb;
crp->crp_session = cse->cses;
crp->crp_opaque = cod;
if (cop->iv) {
if (crde == NULL) {
SDT_PROBE1(opencrypto, dev, ioctl, error, __LINE__);
error = EINVAL;
goto bail;
}
if (cse->cipher == CRYPTO_ARC4) { /* XXX use flag? */
SDT_PROBE1(opencrypto, dev, ioctl, error, __LINE__);
error = EINVAL;
goto bail;
}
if ((error = copyin(cop->iv, crde->crd_iv,
cse->txform->ivsize))) {
SDT_PROBE1(opencrypto, dev, ioctl, error, __LINE__);
goto bail;
}
crde->crd_flags |= CRD_F_IV_EXPLICIT | CRD_F_IV_PRESENT;
crde->crd_skip = 0;
} else if (cse->cipher == CRYPTO_ARC4) { /* XXX use flag? */
crde->crd_skip = 0;
} else if (crde) {
crde->crd_flags |= CRD_F_IV_PRESENT;
crde->crd_skip = cse->txform->ivsize;
crde->crd_len -= cse->txform->ivsize;
}
if (cop->mac && crda == NULL) {
SDT_PROBE1(opencrypto, dev, ioctl, error, __LINE__);
error = EINVAL;
goto bail;
}
cryptodev_warn(cse);
again:
/*
* Let the dispatch run unlocked, then, interlock against the
* callback before checking if the operation completed and going
* to sleep. This insures drivers don't inherit our lock which
* results in a lock order reversal between crypto_dispatch forced
* entry and the crypto_done callback into us.
*/
error = crypto_dispatch(crp);
if (error != 0) {
SDT_PROBE1(opencrypto, dev, ioctl, error, __LINE__);
goto bail;
}
mtx_lock(&cse->lock);
while (!cod->done)
mtx_sleep(cod, &cse->lock, PWAIT, "crydev", 0);
mtx_unlock(&cse->lock);
if (crp->crp_etype == EAGAIN) {
crp->crp_etype = 0;
crp->crp_flags &= ~CRYPTO_F_DONE;
cod->done = false;
goto again;
}
if (crp->crp_etype != 0) {
SDT_PROBE1(opencrypto, dev, ioctl, error, __LINE__);
error = crp->crp_etype;
goto bail;
}
if (cop->dst &&
(error = copyout(cod->uio.uio_iov[0].iov_base, cop->dst,
cop->len))) {
SDT_PROBE1(opencrypto, dev, ioctl, error, __LINE__);
goto bail;
}
if (cop->mac &&
(error = copyout((caddr_t)cod->uio.uio_iov[0].iov_base + cop->len,
cop->mac, cse->thash->hashsize))) {
SDT_PROBE1(opencrypto, dev, ioctl, error, __LINE__);
goto bail;
}
bail:
if (crp)
crypto_freereq(crp);
if (cod)
cod_free(cod);
return (error);
}
static int
cryptodev_aead(
struct csession *cse,
struct crypt_aead *caead,
struct ucred *active_cred,
struct thread *td)
{
struct cryptop_data *cod = NULL;
struct cryptop *crp = NULL;
struct cryptodesc *crde = NULL, *crda = NULL;
int error;
if (caead->len > 256*1024-4 || caead->aadlen > 256*1024-4) {
SDT_PROBE1(opencrypto, dev, ioctl, error, __LINE__);
return (E2BIG);
}
if (cse->txform == NULL || cse->thash == NULL || caead->tag == NULL ||
(caead->len % cse->txform->blocksize) != 0) {
SDT_PROBE1(opencrypto, dev, ioctl, error, __LINE__);
return (EINVAL);
}
cod = cod_alloc(cse, caead->aadlen + caead->len + cse->thash->hashsize,
td);
crp = crypto_getreq(2);
if (crp == NULL) {
error = ENOMEM;
SDT_PROBE1(opencrypto, dev, ioctl, error, __LINE__);
goto bail;
}
if (caead->flags & COP_F_CIPHER_FIRST) {
crde = crp->crp_desc;
crda = crde->crd_next;
} else {
crda = crp->crp_desc;
crde = crda->crd_next;
}
if ((error = copyin(caead->aad, cod->uio.uio_iov[0].iov_base,
caead->aadlen))) {
SDT_PROBE1(opencrypto, dev, ioctl, error, __LINE__);
goto bail;
}
if ((error = copyin(caead->src, (char *)cod->uio.uio_iov[0].iov_base +
caead->aadlen, caead->len))) {
SDT_PROBE1(opencrypto, dev, ioctl, error, __LINE__);
goto bail;
}
/*
* For GCM/CCM, crd_len covers only the AAD. For other ciphers
* chained with an HMAC, crd_len covers both the AAD and the
* cipher text.
*/
crda->crd_skip = 0;
if (cse->cipher == CRYPTO_AES_NIST_GCM_16 ||
cse->cipher == CRYPTO_AES_CCM_16)
crda->crd_len = caead->aadlen;
else
crda->crd_len = caead->aadlen + caead->len;
crda->crd_inject = caead->aadlen + caead->len;
crda->crd_alg = cse->mac;
crda->crd_key = cse->mackey;
crda->crd_klen = cse->mackeylen * 8;
if (caead->op == COP_ENCRYPT)
crde->crd_flags |= CRD_F_ENCRYPT;
else
crde->crd_flags &= ~CRD_F_ENCRYPT;
crde->crd_skip = caead->aadlen;
crde->crd_len = caead->len;
crde->crd_inject = caead->aadlen;
crde->crd_alg = cse->cipher;
crde->crd_key = cse->key;
crde->crd_klen = cse->keylen * 8;
crp->crp_ilen = caead->aadlen + caead->len;
crp->crp_flags = CRYPTO_F_IOV | CRYPTO_F_CBIMM
| (caead->flags & COP_F_BATCH);
crp->crp_uio = &cod->uio;
crp->crp_callback = cryptodev_cb;
crp->crp_session = cse->cses;
crp->crp_opaque = cod;
if (caead->iv) {
if (caead->ivlen > sizeof(crde->crd_iv)) {
error = EINVAL;
SDT_PROBE1(opencrypto, dev, ioctl, error, __LINE__);
goto bail;
}
if ((error = copyin(caead->iv, crde->crd_iv, caead->ivlen))) {
SDT_PROBE1(opencrypto, dev, ioctl, error, __LINE__);
goto bail;
}
crde->crd_flags |= CRD_F_IV_EXPLICIT | CRD_F_IV_PRESENT;
} else {
crde->crd_flags |= CRD_F_IV_PRESENT;
crde->crd_skip += cse->txform->ivsize;
crde->crd_len -= cse->txform->ivsize;
}
if ((error = copyin(caead->tag, (caddr_t)cod->uio.uio_iov[0].iov_base +
caead->len + caead->aadlen, cse->thash->hashsize))) {
SDT_PROBE1(opencrypto, dev, ioctl, error, __LINE__);
goto bail;
}
cryptodev_warn(cse);
again:
/*
* Let the dispatch run unlocked, then, interlock against the
* callback before checking if the operation completed and going
* to sleep. This insures drivers don't inherit our lock which
* results in a lock order reversal between crypto_dispatch forced
* entry and the crypto_done callback into us.
*/
error = crypto_dispatch(crp);
if (error != 0) {
SDT_PROBE1(opencrypto, dev, ioctl, error, __LINE__);
goto bail;
}
mtx_lock(&cse->lock);
while (!cod->done)
mtx_sleep(cod, &cse->lock, PWAIT, "crydev", 0);
mtx_unlock(&cse->lock);
if (crp->crp_etype == EAGAIN) {
crp->crp_etype = 0;
crp->crp_flags &= ~CRYPTO_F_DONE;
cod->done = false;
goto again;
}
if (crp->crp_etype != 0) {
error = crp->crp_etype;
SDT_PROBE1(opencrypto, dev, ioctl, error, __LINE__);
goto bail;
}
if (caead->dst && (error = copyout(
(caddr_t)cod->uio.uio_iov[0].iov_base + caead->aadlen, caead->dst,
caead->len))) {
SDT_PROBE1(opencrypto, dev, ioctl, error, __LINE__);
goto bail;
}
if ((error = copyout((caddr_t)cod->uio.uio_iov[0].iov_base +
caead->aadlen + caead->len, caead->tag, cse->thash->hashsize))) {
SDT_PROBE1(opencrypto, dev, ioctl, error, __LINE__);
goto bail;
}
bail:
crypto_freereq(crp);
if (cod)
cod_free(cod);
return (error);
}
static int
cryptodev_cb(struct cryptop *crp)
{
struct cryptop_data *cod = crp->crp_opaque;
/*
* Lock to ensure the wakeup() is not missed by the loops
* waiting on cod->done in cryptodev_op() and
* cryptodev_aead().
*/
mtx_lock(&cod->cse->lock);
cod->done = true;
mtx_unlock(&cod->cse->lock);
wakeup(cod);
return (0);
}
static int
cryptodevkey_cb(void *op)
{
struct cryptkop *krp = (struct cryptkop *) op;
wakeup_one(krp);
return (0);
}
static int
cryptodev_key(struct crypt_kop *kop)
{
struct cryptkop *krp = NULL;
int error = EINVAL;
int in, out, size, i;
if (kop->crk_iparams + kop->crk_oparams > CRK_MAXPARAM) {
SDT_PROBE1(opencrypto, dev, ioctl, error, __LINE__);
return (EFBIG);
}
in = kop->crk_iparams;
out = kop->crk_oparams;
switch (kop->crk_op) {
case CRK_MOD_EXP:
if (in == 3 && out == 1)
break;
SDT_PROBE1(opencrypto, dev, ioctl, error, __LINE__);
return (EINVAL);
case CRK_MOD_EXP_CRT:
if (in == 6 && out == 1)
break;
SDT_PROBE1(opencrypto, dev, ioctl, error, __LINE__);
return (EINVAL);
case CRK_DSA_SIGN:
if (in == 5 && out == 2)
break;
SDT_PROBE1(opencrypto, dev, ioctl, error, __LINE__);
return (EINVAL);
case CRK_DSA_VERIFY:
if (in == 7 && out == 0)
break;
SDT_PROBE1(opencrypto, dev, ioctl, error, __LINE__);
return (EINVAL);
case CRK_DH_COMPUTE_KEY:
if (in == 3 && out == 1)
break;
SDT_PROBE1(opencrypto, dev, ioctl, error, __LINE__);
return (EINVAL);
default:
SDT_PROBE1(opencrypto, dev, ioctl, error, __LINE__);
return (EINVAL);
}
krp = (struct cryptkop *)malloc(sizeof *krp, M_XDATA, M_WAITOK|M_ZERO);
if (!krp) {
SDT_PROBE1(opencrypto, dev, ioctl, error, __LINE__);
return (ENOMEM);
}
krp->krp_op = kop->crk_op;
krp->krp_status = kop->crk_status;
krp->krp_iparams = kop->crk_iparams;
krp->krp_oparams = kop->crk_oparams;
krp->krp_crid = kop->crk_crid;
krp->krp_status = 0;
krp->krp_callback = (int (*) (struct cryptkop *)) cryptodevkey_cb;
for (i = 0; i < CRK_MAXPARAM; i++) {
if (kop->crk_param[i].crp_nbits > 65536) {
/* Limit is the same as in OpenBSD */
SDT_PROBE1(opencrypto, dev, ioctl, error, __LINE__);
goto fail;
}
krp->krp_param[i].crp_nbits = kop->crk_param[i].crp_nbits;
}
for (i = 0; i < krp->krp_iparams + krp->krp_oparams; i++) {
size = (krp->krp_param[i].crp_nbits + 7) / 8;
if (size == 0)
continue;
krp->krp_param[i].crp_p = malloc(size, M_XDATA, M_WAITOK);
if (i >= krp->krp_iparams)
continue;
error = copyin(kop->crk_param[i].crp_p, krp->krp_param[i].crp_p, size);
if (error) {
SDT_PROBE1(opencrypto, dev, ioctl, error, __LINE__);
goto fail;
}
}
error = crypto_kdispatch(krp);
if (error) {
SDT_PROBE1(opencrypto, dev, ioctl, error, __LINE__);
goto fail;
}
error = tsleep(krp, PSOCK, "crydev", 0);
if (error) {
/* XXX can this happen? if so, how do we recover? */
SDT_PROBE1(opencrypto, dev, ioctl, error, __LINE__);
goto fail;
}
kop->crk_crid = krp->krp_crid; /* device that did the work */
if (krp->krp_status != 0) {
error = krp->krp_status;
SDT_PROBE1(opencrypto, dev, ioctl, error, __LINE__);
goto fail;
}
for (i = krp->krp_iparams; i < krp->krp_iparams + krp->krp_oparams; i++) {
size = (krp->krp_param[i].crp_nbits + 7) / 8;
if (size == 0)
continue;
error = copyout(krp->krp_param[i].crp_p, kop->crk_param[i].crp_p, size);
if (error) {
SDT_PROBE1(opencrypto, dev, ioctl, error, __LINE__);
goto fail;
}
}
fail:
if (krp) {
kop->crk_status = krp->krp_status;
for (i = 0; i < CRK_MAXPARAM; i++) {
if (krp->krp_param[i].crp_p)
free(krp->krp_param[i].crp_p, M_XDATA);
}
free(krp, M_XDATA);
}
return (error);
}
static int
cryptodev_find(struct crypt_find_op *find)
{
device_t dev;
size_t fnlen = sizeof find->name;
if (find->crid != -1) {
dev = crypto_find_device_byhid(find->crid);
if (dev == NULL)
return (ENOENT);
strncpy(find->name, device_get_nameunit(dev), fnlen);
find->name[fnlen - 1] = '\x0';
} else {
find->name[fnlen - 1] = '\x0';
find->crid = crypto_find_driver(find->name);
if (find->crid == -1)
return (ENOENT);
}
return (0);
}
/* ARGSUSED */
static int
cryptof_stat(
struct file *fp,
struct stat *sb,
struct ucred *active_cred,
struct thread *td)
{
return (EOPNOTSUPP);
}
/* ARGSUSED */
static int
cryptof_close(struct file *fp, struct thread *td)
{
struct fcrypt *fcr = fp->f_data;
struct csession *cse;
while ((cse = TAILQ_FIRST(&fcr->csessions))) {
TAILQ_REMOVE(&fcr->csessions, cse, next);
KASSERT(cse->refs == 1,
("%s: crypto session %p with %d refs", __func__, cse,
cse->refs));
csefree(cse);
}
free(fcr, M_XDATA);
fp->f_data = NULL;
return 0;
}
static int
cryptof_fill_kinfo(struct file *fp, struct kinfo_file *kif, struct filedesc *fdp)
{
kif->kf_type = KF_TYPE_CRYPTO;
return (0);
}
static struct csession *
csefind(struct fcrypt *fcr, u_int ses)
{
struct csession *cse;
mtx_lock(&fcr->lock);
TAILQ_FOREACH(cse, &fcr->csessions, next) {
if (cse->ses == ses) {
refcount_acquire(&cse->refs);
mtx_unlock(&fcr->lock);
return (cse);
}
}
mtx_unlock(&fcr->lock);
return (NULL);
}
static bool
csedelete(struct fcrypt *fcr, u_int ses)
{
struct csession *cse;
mtx_lock(&fcr->lock);
TAILQ_FOREACH(cse, &fcr->csessions, next) {
if (cse->ses == ses) {
TAILQ_REMOVE(&fcr->csessions, cse, next);
mtx_unlock(&fcr->lock);
csefree(cse);
return (true);
}
}
mtx_unlock(&fcr->lock);
return (false);
}
struct csession *
csecreate(struct fcrypt *fcr, crypto_session_t cses, caddr_t key, u_int64_t keylen,
caddr_t mackey, u_int64_t mackeylen, u_int32_t cipher, u_int32_t mac,
struct enc_xform *txform, struct auth_hash *thash)
{
struct csession *cse;
cse = malloc(sizeof(struct csession), M_XDATA, M_NOWAIT | M_ZERO);
if (cse == NULL)
return NULL;
mtx_init(&cse->lock, "cryptodev", "crypto session lock", MTX_DEF);
refcount_init(&cse->refs, 1);
cse->key = key;
cse->keylen = keylen/8;
cse->mackey = mackey;
cse->mackeylen = mackeylen/8;
cse->cses = cses;
cse->cipher = cipher;
cse->mac = mac;
cse->txform = txform;
cse->thash = thash;
mtx_lock(&fcr->lock);
TAILQ_INSERT_TAIL(&fcr->csessions, cse, next);
cse->ses = fcr->sesn++;
mtx_unlock(&fcr->lock);
return (cse);
}
static void
csefree(struct csession *cse)
{
if (!refcount_release(&cse->refs))
return;
crypto_freesession(cse->cses);
mtx_destroy(&cse->lock);
if (cse->key)
free(cse->key, M_XDATA);
if (cse->mackey)
free(cse->mackey, M_XDATA);
free(cse, M_XDATA);
}
static int
cryptoioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thread *td)
{
struct file *f;
struct fcrypt *fcr;
int fd, error;
switch (cmd) {
case CRIOGET:
error = falloc_noinstall(td, &f);
if (error)
break;
fcr = malloc(sizeof(struct fcrypt), M_XDATA, M_WAITOK | M_ZERO);
TAILQ_INIT(&fcr->csessions);
mtx_init(&fcr->lock, "fcrypt", NULL, MTX_DEF);
finit(f, FREAD | FWRITE, DTYPE_CRYPTO, fcr, &cryptofops);
error = finstall(td, f, &fd, 0, NULL);
if (error) {
mtx_destroy(&fcr->lock);
free(fcr, M_XDATA);
} else
*(uint32_t *)data = fd;
fdrop(f, td);
break;
case CRIOFINDDEV:
error = cryptodev_find((struct crypt_find_op *)data);
break;
case CRIOASYMFEAT:
error = crypto_getfeat((int *)data);
break;
default:
error = EINVAL;
break;
}
return (error);
}
static struct cdevsw crypto_cdevsw = {
.d_version = D_VERSION,
.d_ioctl = cryptoioctl,
.d_name = "crypto",
};
static struct cdev *crypto_dev;
/*
* Initialization code, both for static and dynamic loading.
*/
static int
cryptodev_modevent(module_t mod, int type, void *unused)
{
switch (type) {
case MOD_LOAD:
if (bootverbose)
printf("crypto: <crypto device>\n");
crypto_dev = make_dev(&crypto_cdevsw, 0,
UID_ROOT, GID_WHEEL, 0666,
"crypto");
return 0;
case MOD_UNLOAD:
/*XXX disallow if active sessions */
destroy_dev(crypto_dev);
return 0;
}
return EINVAL;
}
static moduledata_t cryptodev_mod = {
"cryptodev",
cryptodev_modevent,
0
};
MODULE_VERSION(cryptodev, 1);
DECLARE_MODULE(cryptodev, cryptodev_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
MODULE_DEPEND(cryptodev, crypto, 1, 1, 1);
MODULE_DEPEND(cryptodev, zlib, 1, 1, 1);
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