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freebsd-skq/sys/opencrypto/cryptodev.c
cem 0c65f5254f opencrypto: Loosen restriction on HMAC key sizes 
Theoretically, HMACs do not actually have any limit on key sizes.
Transforms should compact input keys larger than the HMAC block size by
using the transform (hash) on the input key.

(Short input keys are padded out with zeros to the HMAC block size.)

Still, not all FreeBSD crypto drivers that provide HMAC functionality
handle longer-than-blocksize keys appropriately, so enforce a "maximum" key
length in the crypto API for auth_hashes that previously expressed a
requirement.  (The "maximum" is the size of a single HMAC block for the
given transform.)  Unconstrained auth_hashes are left as-is.

I believe the previous hardcoded sizes were committed in the original
import of opencrypto from OpenBSD and are due to specific protocol
details of IPSec.  Note that none of the previous sizes actually matched
the appropriate HMAC block size.

The previous hardcoded sizes made the SHA tests in cryptotest.py
useless for testing FreeBSD crypto drivers; none of the NIST-KAT example
inputs had keys sized to the previous expectations.

The following drivers were audited to check that they handled keys up to
the block size of the HMAC safely:

  Software HMAC:
    * padlock(4)
    * cesa
    * glxsb
    * safe(4)
    * ubsec(4)

  Hardware accelerated HMAC:
    * ccr(4)
    * hifn(4)
    * sec(4) (Only supports up to 64 byte keys despite claiming to
      support SHA2 HMACs, but validates input key sizes)
    * cryptocteon (MIPS)
    * nlmsec (MIPS)
    * rmisec (MIPS) (Amusingly, does not appear to use key material at
      all -- presumed broken)

Reviewed by:	jhb (previous version), rlibby (previous version)
Sponsored by:	Dell EMC Isilon
Differential Revision:	https://reviews.freebsd.org/D12437
2017-09-26 16:18:10 +00:00

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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 "opt_compat.h"
#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;
u_int64_t sid;
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;
u_char tmp_iv[EALG_MAX_BLOCK_LEN];
caddr_t mackey;
int mackeylen;
struct iovec iovec;
struct uio uio;
int error;
};
struct fcrypt {
TAILQ_HEAD(csessionlist, csession) csessions;
int sesn;
};
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 int csedelete(struct fcrypt *, struct csession *);
static struct csession *cseadd(struct fcrypt *, struct csession *);
static struct csession *csecreate(struct fcrypt *, u_int64_t, caddr_t,
u_int64_t, caddr_t, u_int64_t, u_int32_t, u_int32_t, struct enc_xform *,
struct auth_hash *);
static int 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;
u_int64_t sid;
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;
default:
CRYPTDEB("invalid cipher");
return (EINVAL);
}
switch (sop->mac) {
case 0:
break;
case CRYPTO_MD5_HMAC:
thash = &auth_hash_hmac_md5;
break;
case CRYPTO_SHA1_HMAC:
thash = &auth_hash_hmac_sha1;
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;
#ifdef notdef
case CRYPTO_MD5:
thash = &auth_hash_md5;
break;
case CRYPTO_SHA1:
thash = &auth_hash_sha1;
break;
#endif
case CRYPTO_NULL_HMAC:
thash = &auth_hash_null;
break;
default:
CRYPTDEB("invalid mac");
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;
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");
goto bail;
}
if (thash)
crie.cri_next = &cria;
}
if (thash) {
cria.cri_alg = thash->type;
cria.cri_klen = sop->mackeylen * 8;
if (thash->keysize != 0 &&
sop->mackeylen > thash->keysize) {
CRYPTDEB("invalid mac key length");
error = EINVAL;
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");
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");
goto bail;
}
} else
crid = CRYPTOCAP_F_HARDWARE;
error = crypto_newsession(&sid, (txform ? &crie : &cria), crid);
if (error) {
CRYPTDEB("crypto_newsession");
goto bail;
}
cse = csecreate(fcr, sid, crie.cri_key, crie.cri_klen,
cria.cri_key, cria.cri_klen, sop->cipher, sop->mac, txform,
thash);
if (cse == NULL) {
crypto_freesession(sid);
error = EINVAL;
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_SESID2HID(cse->sid);
}
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;
cse = csefind(fcr, ses);
if (cse == NULL)
return (EINVAL);
csedelete(fcr, cse);
error = csefree(cse);
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);
#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)
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);
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)
return (EINVAL);
error = cryptodev_aead(cse, caead, active_cred, td);
break;
default:
error = EINVAL;
break;
}
return (error);
#undef SES2
}
static int cryptodev_cb(void *);
static int
cryptodev_op(
struct csession *cse,
struct crypt_op *cop,
struct ucred *active_cred,
struct thread *td)
{
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);
}
}
cse->uio.uio_iov = &cse->iovec;
cse->uio.uio_iovcnt = 1;
cse->uio.uio_offset = 0;
cse->uio.uio_resid = cop->len;
cse->uio.uio_segflg = UIO_SYSSPACE;
cse->uio.uio_rw = UIO_WRITE;
cse->uio.uio_td = td;
cse->uio.uio_iov[0].iov_len = cop->len;
if (cse->thash) {
cse->uio.uio_iov[0].iov_len += cse->thash->hashsize;
cse->uio.uio_resid += cse->thash->hashsize;
}
cse->uio.uio_iov[0].iov_base = malloc(cse->uio.uio_iov[0].iov_len,
M_XDATA, M_WAITOK);
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, cse->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_buf = (caddr_t)&cse->uio;
crp->crp_callback = (int (*) (struct cryptop *)) cryptodev_cb;
crp->crp_sid = cse->sid;
crp->crp_opaque = (void *)cse;
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, cse->tmp_iv,
cse->txform->blocksize))) {
SDT_PROBE1(opencrypto, dev, ioctl, error, __LINE__);
goto bail;
}
bcopy(cse->tmp_iv, crde->crd_iv, cse->txform->blocksize);
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->blocksize;
crde->crd_len -= cse->txform->blocksize;
}
if (cop->mac && crda == NULL) {
SDT_PROBE1(opencrypto, dev, ioctl, error, __LINE__);
error = EINVAL;
goto bail;
}
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);
mtx_lock(&cse->lock);
if (error == 0 && (crp->crp_flags & CRYPTO_F_DONE) == 0)
error = msleep(crp, &cse->lock, PWAIT, "crydev", 0);
mtx_unlock(&cse->lock);
if (error != 0) {
SDT_PROBE1(opencrypto, dev, ioctl, error, __LINE__);
goto bail;
}
if (crp->crp_etype == EAGAIN) {
crp->crp_etype = 0;
crp->crp_flags &= ~CRYPTO_F_DONE;
goto again;
}
if (crp->crp_etype != 0) {
SDT_PROBE1(opencrypto, dev, ioctl, error, __LINE__);
error = crp->crp_etype;
goto bail;
}
if (cse->error) {
SDT_PROBE1(opencrypto, dev, ioctl, error, __LINE__);
error = cse->error;
goto bail;
}
if (cop->dst &&
(error = copyout(cse->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)cse->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 (cse->uio.uio_iov[0].iov_base)
free(cse->uio.uio_iov[0].iov_base, M_XDATA);
return (error);
}
static int
cryptodev_aead(
struct csession *cse,
struct crypt_aead *caead,
struct ucred *active_cred,
struct thread *td)
{
struct uio *uio;
struct cryptop *crp = NULL;
struct cryptodesc *crde = NULL, *crda = NULL;
int error;
if (caead->len > 256*1024-4 || caead->aadlen > 256*1024-4)
return (E2BIG);
if (cse->txform == NULL || cse->thash == NULL || caead->tag == NULL ||
(caead->len % cse->txform->blocksize) != 0)
return (EINVAL);
uio = &cse->uio;
uio->uio_iov = &cse->iovec;
uio->uio_iovcnt = 1;
uio->uio_offset = 0;
uio->uio_resid = caead->aadlen + caead->len + cse->thash->hashsize;
uio->uio_segflg = UIO_SYSSPACE;
uio->uio_rw = UIO_WRITE;
uio->uio_td = td;
uio->uio_iov[0].iov_len = uio->uio_resid;
uio->uio_iov[0].iov_base = malloc(uio->uio_iov[0].iov_len,
M_XDATA, M_WAITOK);
crp = crypto_getreq(2);
if (crp == NULL) {
error = ENOMEM;
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, cse->uio.uio_iov[0].iov_base,
caead->aadlen)))
goto bail;
if ((error = copyin(caead->src, (char *)cse->uio.uio_iov[0].iov_base +
caead->aadlen, caead->len)))
goto bail;
/*
* For GCM, 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)
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_buf = (caddr_t)&cse->uio.uio_iov;
crp->crp_callback = (int (*) (struct cryptop *)) cryptodev_cb;
crp->crp_sid = cse->sid;
crp->crp_opaque = (void *)cse;
if (caead->iv) {
if (caead->ivlen > sizeof cse->tmp_iv) {
error = EINVAL;
goto bail;
}
if ((error = copyin(caead->iv, cse->tmp_iv, caead->ivlen)))
goto bail;
bcopy(cse->tmp_iv, crde->crd_iv, caead->ivlen);
crde->crd_flags |= CRD_F_IV_EXPLICIT | CRD_F_IV_PRESENT;
} else {
crde->crd_flags |= CRD_F_IV_PRESENT;
crde->crd_skip += cse->txform->blocksize;
crde->crd_len -= cse->txform->blocksize;
}
if ((error = copyin(caead->tag, (caddr_t)cse->uio.uio_iov[0].iov_base +
caead->len + caead->aadlen, cse->thash->hashsize)))
goto bail;
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);
mtx_lock(&cse->lock);
if (error == 0 && (crp->crp_flags & CRYPTO_F_DONE) == 0)
error = msleep(crp, &cse->lock, PWAIT, "crydev", 0);
mtx_unlock(&cse->lock);
if (error != 0)
goto bail;
if (crp->crp_etype == EAGAIN) {
crp->crp_etype = 0;
crp->crp_flags &= ~CRYPTO_F_DONE;
goto again;
}
if (crp->crp_etype != 0) {
error = crp->crp_etype;
goto bail;
}
if (cse->error) {
error = cse->error;
goto bail;
}
if (caead->dst && (error = copyout(
(caddr_t)cse->uio.uio_iov[0].iov_base + caead->aadlen, caead->dst,
caead->len)))
goto bail;
if ((error = copyout((caddr_t)cse->uio.uio_iov[0].iov_base +
caead->aadlen + caead->len, caead->tag, cse->thash->hashsize)))
goto bail;
bail:
crypto_freereq(crp);
free(cse->uio.uio_iov[0].iov_base, M_XDATA);
return (error);
}
static int
cryptodev_cb(void *op)
{
struct cryptop *crp = (struct cryptop *) op;
struct csession *cse = (struct csession *)crp->crp_opaque;
mtx_lock(&cse->lock);
cse->error = crp->crp_etype;
wakeup_one(crp);
mtx_unlock(&cse->lock);
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) {
return (EFBIG);
}
in = kop->crk_iparams;
out = kop->crk_oparams;
switch (kop->crk_op) {
case CRK_MOD_EXP:
if (in == 3 && out == 1)
break;
return (EINVAL);
case CRK_MOD_EXP_CRT:
if (in == 6 && out == 1)
break;
return (EINVAL);
case CRK_DSA_SIGN:
if (in == 5 && out == 2)
break;
return (EINVAL);
case CRK_DSA_VERIFY:
if (in == 7 && out == 0)
break;
return (EINVAL);
case CRK_DH_COMPUTE_KEY:
if (in == 3 && out == 1)
break;
return (EINVAL);
default:
return (EINVAL);
}
krp = (struct cryptkop *)malloc(sizeof *krp, M_XDATA, M_WAITOK|M_ZERO);
if (!krp)
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 */
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)
goto fail;
}
error = crypto_kdispatch(krp);
if (error)
goto fail;
error = tsleep(krp, PSOCK, "crydev", 0);
if (error) {
/* XXX can this happen? if so, how do we recover? */
goto fail;
}
kop->crk_crid = krp->krp_crid; /* device that did the work */
if (krp->krp_status != 0) {
error = krp->krp_status;
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)
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);
(void)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;
TAILQ_FOREACH(cse, &fcr->csessions, next)
if (cse->ses == ses)
return (cse);
return (NULL);
}
static int
csedelete(struct fcrypt *fcr, struct csession *cse_del)
{
struct csession *cse;
TAILQ_FOREACH(cse, &fcr->csessions, next) {
if (cse == cse_del) {
TAILQ_REMOVE(&fcr->csessions, cse, next);
return (1);
}
}
return (0);
}
static struct csession *
cseadd(struct fcrypt *fcr, struct csession *cse)
{
TAILQ_INSERT_TAIL(&fcr->csessions, cse, next);
cse->ses = fcr->sesn++;
return (cse);
}
struct csession *
csecreate(struct fcrypt *fcr, u_int64_t sid, 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);
cse->key = key;
cse->keylen = keylen/8;
cse->mackey = mackey;
cse->mackeylen = mackeylen/8;
cse->sid = sid;
cse->cipher = cipher;
cse->mac = mac;
cse->txform = txform;
cse->thash = thash;
cseadd(fcr, cse);
return (cse);
}
static int
csefree(struct csession *cse)
{
int error;
error = crypto_freesession(cse->sid);
mtx_destroy(&cse->lock);
if (cse->key)
free(cse->key, M_XDATA);
if (cse->mackey)
free(cse->mackey, M_XDATA);
free(cse, M_XDATA);
return (error);
}
static int
cryptoopen(struct cdev *dev, int oflags, int devtype, struct thread *td)
{
return (0);
}
static int
cryptoread(struct cdev *dev, struct uio *uio, int ioflag)
{
return (EIO);
}
static int
cryptowrite(struct cdev *dev, struct uio *uio, int ioflag)
{
return (EIO);
}
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:
fcr = malloc(sizeof(struct fcrypt), M_XDATA, M_WAITOK);
TAILQ_INIT(&fcr->csessions);
fcr->sesn = 0;
error = falloc(td, &f, &fd, 0);
if (error) {
free(fcr, M_XDATA);
return (error);
}
/* falloc automatically provides an extra reference to 'f'. */
finit(f, FREAD | FWRITE, DTYPE_CRYPTO, fcr, &cryptofops);
*(u_int32_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_flags = D_NEEDGIANT,
.d_open = cryptoopen,
.d_read = cryptoread,
.d_write = cryptowrite,
.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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