NetBSD/sys/opencrypto/cryptodev.c

792 lines
18 KiB
C

/* $NetBSD: cryptodev.c,v 1.21 2006/05/14 21:36:50 elad Exp $ */
/* $FreeBSD: src/sys/opencrypto/cryptodev.c,v 1.4.2.4 2003/06/03 00:09:02 sam Exp $ */
/* $OpenBSD: cryptodev.c,v 1.53 2002/07/10 22:21:30 mickey Exp $ */
/*
* Copyright (c) 2001 Theo de Raadt
*
* 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>
__KERNEL_RCSID(0, "$NetBSD: cryptodev.c,v 1.21 2006/05/14 21:36:50 elad Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/sysctl.h>
#include <sys/file.h>
#include <sys/filedesc.h>
#include <sys/errno.h>
#include <sys/md5.h>
#include <sys/sha1.h>
#include <sys/conf.h>
#include <sys/device.h>
#include <sys/kauth.h>
#include <opencrypto/cryptodev.h>
#include <opencrypto/xform.h>
#ifdef __NetBSD__
#define splcrypto splnet
#endif
#ifdef CRYPTO_DEBUG
#define DPRINTF(a) uprintf a
#else
#define DPRINTF(a)
#endif
struct csession {
TAILQ_ENTRY(csession) next;
u_int64_t sid;
u_int32_t ses;
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;
u_char tmp_mac[CRYPTO_MAX_MAC_LEN];
struct iovec iovec[IOV_MAX];
struct uio uio;
int error;
};
struct fcrypt {
TAILQ_HEAD(csessionlist, csession) csessions;
int sesn;
};
/* Declaration of master device (fd-cloning/ctxt-allocating) entrypoints */
static int cryptoopen(dev_t dev, int flag, int mode, struct lwp *l);
static int cryptoread(dev_t dev, struct uio *uio, int ioflag);
static int cryptowrite(dev_t dev, struct uio *uio, int ioflag);
static int cryptoioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct lwp *l);
static int cryptoselect(dev_t dev, int rw, struct lwp *l);
/* Declaration of cloned-device (per-ctxt) entrypoints */
static int cryptof_read(struct file *, off_t *, struct uio *, kauth_cred_t, int);
static int cryptof_write(struct file *, off_t *, struct uio *, kauth_cred_t, int);
static int cryptof_ioctl(struct file *, u_long, void*, struct lwp *l);
static int cryptof_close(struct file *, struct lwp *);
static const struct fileops cryptofops = {
cryptof_read,
cryptof_write,
cryptof_ioctl,
fnullop_fcntl,
fnullop_poll,
fbadop_stat,
cryptof_close,
fnullop_kqfilter
};
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 lwp *);
static int cryptodev_key(struct crypt_kop *);
int cryptodev_dokey(struct crypt_kop *kop, struct crparam kvp[]);
static int cryptodev_cb(void *);
static int cryptodevkey_cb(void *);
/*
* sysctl-able control variables for /dev/crypto now defined in crypto.c:
* crypto_usercrypto, crypto_userasmcrypto, crypto_devallowsoft.
*/
/* ARGSUSED */
int
cryptof_read(struct file *fp, off_t *poff, struct uio *uio,
kauth_cred_t cred, int flags)
{
return (EIO);
}
/* ARGSUSED */
int
cryptof_write(struct file *fp, off_t *poff, struct uio *uio,
kauth_cred_t cred, int flags)
{
return (EIO);
}
/* ARGSUSED */
int
cryptof_ioctl(struct file *fp, u_long cmd, void* data, struct lwp *l)
{
struct cryptoini cria, crie;
struct fcrypt *fcr = (struct fcrypt *)fp->f_data;
struct csession *cse;
struct session_op *sop;
struct crypt_op *cop;
struct enc_xform *txform = NULL;
struct auth_hash *thash = NULL;
u_int64_t sid;
u_int32_t ses;
int error = 0;
switch (cmd) {
case CIOCGSESSION:
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_NULL_CBC:
txform = &enc_xform_null;
break;
case CRYPTO_ARC4:
txform = &enc_xform_arc4;
break;
default:
DPRINTF(("Invalid cipher %d\n", sop->cipher));
return (EINVAL);
}
switch (sop->mac) {
case 0:
break;
case CRYPTO_MD5_HMAC:
thash = &auth_hash_hmac_md5_96;
break;
case CRYPTO_SHA1_HMAC:
thash = &auth_hash_hmac_sha1_96;
break;
case CRYPTO_SHA2_HMAC:
if (sop->mackeylen == auth_hash_hmac_sha2_256.keysize)
thash = &auth_hash_hmac_sha2_256;
else if (sop->mackeylen == auth_hash_hmac_sha2_384.keysize)
thash = &auth_hash_hmac_sha2_384;
else if (sop->mackeylen == auth_hash_hmac_sha2_512.keysize)
thash = &auth_hash_hmac_sha2_512;
else {
DPRINTF(("Invalid mackeylen %d\n",
sop->mackeylen));
return (EINVAL);
}
break;
case CRYPTO_RIPEMD160_HMAC:
thash = &auth_hash_hmac_ripemd_160_96;
break;
case CRYPTO_MD5:
thash = &auth_hash_md5;
break;
case CRYPTO_SHA1:
thash = &auth_hash_sha1;
break;
case CRYPTO_NULL_HMAC:
thash = &auth_hash_null;
break;
default:
DPRINTF(("Invalid mac %d\n", sop->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) {
DPRINTF(("keylen %d not in [%d,%d]\n",
sop->keylen, txform->minkey,
txform->maxkey));
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)))
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) {
DPRINTF(("mackeylen %d != keysize %d\n",
sop->mackeylen, thash->keysize));
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)))
goto bail;
}
}
error = crypto_newsession(&sid, (txform ? &crie : &cria),
crypto_devallowsoft);
if (error) {
DPRINTF(("SIOCSESSION violates kernel parameters %d\n",
error));
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) {
DPRINTF(("csecreate failed\n"));
crypto_freesession(sid);
error = EINVAL;
goto bail;
}
sop->ses = cse->ses;
bail:
if (error) {
if (crie.cri_key)
FREE(crie.cri_key, M_XDATA);
if (cria.cri_key)
FREE(cria.cri_key, M_XDATA);
}
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:
cop = (struct crypt_op *)data;
cse = csefind(fcr, cop->ses);
if (cse == NULL) {
DPRINTF(("csefind failed\n"));
return (EINVAL);
}
error = cryptodev_op(cse, cop, l);
break;
case CIOCKEY:
error = cryptodev_key((struct crypt_kop *)data);
break;
case CIOCASYMFEAT:
error = crypto_getfeat((int *)data);
break;
default:
DPRINTF(("invalid ioctl cmd %ld\n", cmd));
error = EINVAL;
}
return (error);
}
static int
cryptodev_op(struct csession *cse, struct crypt_op *cop, struct lwp *l)
{
struct cryptop *crp = NULL;
struct cryptodesc *crde = NULL, *crda = NULL;
int i, error, s;
if (cop->len > 256*1024-4)
return (E2BIG);
if (cse->txform) {
if (cop->len == 0 || (cop->len % cse->txform->blocksize) != 0)
return (EINVAL);
}
bzero(&cse->uio, sizeof(cse->uio));
cse->uio.uio_iovcnt = 1;
cse->uio.uio_resid = 0;
cse->uio.uio_rw = UIO_WRITE;
cse->uio.uio_iov = cse->iovec;
UIO_SETUP_SYSSPACE(&cse->uio);
bzero(&cse->iovec, sizeof(cse->iovec));
cse->uio.uio_iov[0].iov_len = cop->len;
cse->uio.uio_iov[0].iov_base = malloc(cop->len, M_XDATA, M_WAITOK);
for (i = 0; i < cse->uio.uio_iovcnt; i++)
cse->uio.uio_resid += cse->uio.uio_iov[0].iov_len;
crp = crypto_getreq((cse->txform != NULL) + (cse->thash != NULL));
if (crp == NULL) {
error = ENOMEM;
goto bail;
}
if (cse->thash) {
crda = crp->crp_desc;
if (cse->txform)
crde = crda->crd_next;
} else {
if (cse->txform)
crde = crp->crp_desc;
else {
error = EINVAL;
goto bail;
}
}
if ((error = copyin(cop->src, cse->uio.uio_iov[0].iov_base, cop->len)))
goto bail;
if (crda) {
crda->crd_skip = 0;
crda->crd_len = cop->len;
crda->crd_inject = 0; /* ??? */
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) {
error = EINVAL;
goto bail;
}
if (cse->cipher == CRYPTO_ARC4) { /* XXX use flag? */
error = EINVAL;
goto bail;
}
if ((error = copyin(cop->iv, cse->tmp_iv, cse->txform->blocksize)))
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 (crde) {
if (cse->cipher == CRYPTO_ARC4) { /* XXX use flag? */
crde->crd_skip = 0;
} else {
crde->crd_flags |= CRD_F_IV_PRESENT;
crde->crd_skip = cse->txform->blocksize;
crde->crd_len -= cse->txform->blocksize;
}
}
if (cop->mac) {
if (crda == NULL) {
error = EINVAL;
goto bail;
}
crp->crp_mac=cse->tmp_mac;
}
s = splcrypto(); /* NB: only needed with CRYPTO_F_CBIMM */
error = crypto_dispatch(crp);
if (error == 0 && (crp->crp_flags & CRYPTO_F_DONE) == 0)
error = tsleep(crp, PSOCK, "crydev", 0);
splx(s);
if (error) {
goto bail;
}
if (crp->crp_etype != 0) {
error = crp->crp_etype;
goto bail;
}
if (cse->error) {
error = cse->error;
goto bail;
}
if (cop->dst &&
(error = copyout(cse->uio.uio_iov[0].iov_base, cop->dst, cop->len)))
goto bail;
if (cop->mac &&
(error = copyout(crp->crp_mac, cop->mac, cse->thash->authsize)))
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_cb(void *op)
{
struct cryptop *crp = (struct cryptop *) op;
struct csession *cse = (struct csession *)crp->crp_opaque;
cse->error = crp->crp_etype;
if (crp->crp_etype == EAGAIN)
return crypto_dispatch(crp);
wakeup_one(crp);
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);
if (!krp)
return (ENOMEM);
bzero(krp, sizeof *krp);
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_status = 0;
krp->krp_callback = (int (*) (struct cryptkop *)) cryptodevkey_cb;
for (i = 0; i < CRK_MAXPARAM; i++)
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 == 0)
error = tsleep(krp, PSOCK, "crydev", 0);
if (error)
goto fail;
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);
}
/* ARGSUSED */
static int
cryptof_close(struct file *fp, struct lwp *l)
{
struct fcrypt *fcr = (struct fcrypt *)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);
/* close() stolen from sys/kern/kern_ktrace.c */
fp->f_data = NULL;
#if 0
FILE_UNUSE(fp, l); /* release file */
fdrelease(l, fd); /* release fd table slot */
#endif
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);
}
static 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;
MALLOC(cse, struct csession *, sizeof(struct csession),
M_XDATA, M_NOWAIT);
if (cse == NULL)
return NULL;
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);
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(dev_t dev, int flag, int mode, struct lwp *l)
{
if (crypto_usercrypto == 0)
return (ENXIO);
return (0);
}
static int
cryptoread(dev_t dev, struct uio *uio, int ioflag)
{
return (EIO);
}
static int
cryptowrite(dev_t dev, struct uio *uio, int ioflag)
{
return (EIO);
}
static int
cryptoioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct lwp *l)
{
struct file *f;
struct fcrypt *fcr;
int fd, error;
switch (cmd) {
case CRIOGET:
MALLOC(fcr, struct fcrypt *,
sizeof(struct fcrypt), M_XDATA, M_WAITOK);
TAILQ_INIT(&fcr->csessions);
fcr->sesn = 0;
error = falloc(l->l_proc, &f, &fd);
if (error) {
FREE(fcr, M_XDATA);
return (error);
}
f->f_flag = FREAD | FWRITE;
f->f_type = DTYPE_CRYPTO;
f->f_ops = &cryptofops;
f->f_data = (caddr_t) fcr;
*(u_int32_t *)data = fd;
FILE_SET_MATURE(f);
FILE_UNUSE(f, l);
break;
default:
error = EINVAL;
break;
}
return (error);
}
int
cryptoselect(dev_t dev, int rw, struct lwp *l)
{
return (0);
}
/*static*/
struct cdevsw crypto_cdevsw = {
/* open */ cryptoopen,
/* close */ nullclose,
/* read */ cryptoread,
/* write */ cryptowrite,
/* ioctl */ cryptoioctl,
/* ttstop?*/ nostop,
/* ??*/ notty,
/* poll */ cryptoselect /*nopoll*/,
/* mmap */ nommap,
/* kqfilter */ nokqfilter,
};
#ifdef __NetBSD__
/*
* Pseudo-device initialization routine for /dev/crypto
*/
void cryptoattach(int);
void
cryptoattach(int num)
{
/* nothing to do */
}
#endif /* __NetBSD__ */