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freebsd-dev/sys/opencrypto/cryptosoft.c
John-Mark Gurney a2bc81bf7c Make IPsec work with AES-GCM and AES-ICM (aka CTR) in OCF... IPsec 
defines the keys differently than NIST does, so we have to muck with
key lengths and nonce/IVs to be standard compliant...

Remove the iv from secasvar as it was unused...

Add a counter protected by a mutex to ensure that the counter for GCM
and ICM will never be repeated..  This is a requirement for security..
I would use atomics, but we don't have a 64bit one on all platforms..

Fix a bug where IPsec was depending upon the OCF to ensure that the
blocksize was always at least 4 bytes to maintain alignment... Move
this logic into IPsec so changes to OCF won't break IPsec...

In one place, espx was always non-NULL, so don't test that it's
non-NULL before doing work..

minor style cleanups...

drop setting key and klen as they were not used...

Enforce that OCF won't pass invalid key lengths to AES that would
panic the machine...

This was has been tested by others too...  I tested this against
NetBSD 6.1.5 using mini-test suite in
https://github.com/jmgurney/ipseccfgs and the only things that don't
pass are keyed md5 and sha1, and 3des-deriv (setkey syntax error),
all other modes listed in setkey's man page...  The nice thing is
that NetBSD uses setkey, so same config files were used on both...

Reviewed by:	gnn
2015-08-04 17:47:11 +00:00

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/* $OpenBSD: cryptosoft.c,v 1.35 2002/04/26 08:43:50 deraadt Exp $ */
/*-
* The author of this code is Angelos D. Keromytis (angelos@cis.upenn.edu)
* Copyright (c) 2002-2006 Sam Leffler, Errno Consulting
*
* This code was written by Angelos D. Keromytis in Athens, Greece, in
* February 2000. Network Security Technologies Inc. (NSTI) kindly
* supported the development of this code.
*
* Copyright (c) 2000, 2001 Angelos D. Keromytis
* 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).
*
* Permission to use, copy, and modify this software with or without fee
* is hereby granted, provided that this entire notice is included in
* all source code copies of any software which is or includes a copy or
* modification of this software.
*
* THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTY. IN PARTICULAR, NONE OF THE AUTHORS MAKES ANY
* REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE
* MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR
* PURPOSE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/module.h>
#include <sys/sysctl.h>
#include <sys/errno.h>
#include <sys/random.h>
#include <sys/kernel.h>
#include <sys/uio.h>
#include <sys/lock.h>
#include <sys/rwlock.h>
#include <sys/endian.h>
#include <sys/limits.h>
#include <crypto/blowfish/blowfish.h>
#include <crypto/sha1.h>
#include <opencrypto/rmd160.h>
#include <opencrypto/cast.h>
#include <opencrypto/skipjack.h>
#include <sys/md5.h>
#include <opencrypto/cryptodev.h>
#include <opencrypto/cryptosoft.h>
#include <opencrypto/xform.h>
#include <sys/kobj.h>
#include <sys/bus.h>
#include "cryptodev_if.h"
static int32_t swcr_id;
static struct swcr_data **swcr_sessions = NULL;
static u_int32_t swcr_sesnum;
/* Protects swcr_sessions pointer, not data. */
static struct rwlock swcr_sessions_lock;
u_int8_t hmac_ipad_buffer[HMAC_MAX_BLOCK_LEN];
u_int8_t hmac_opad_buffer[HMAC_MAX_BLOCK_LEN];
static int swcr_encdec(struct cryptodesc *, struct swcr_data *, caddr_t, int);
static int swcr_authcompute(struct cryptodesc *, struct swcr_data *, caddr_t, int);
static int swcr_authenc(struct cryptop *crp);
static int swcr_compdec(struct cryptodesc *, struct swcr_data *, caddr_t, int);
static int swcr_freesession(device_t dev, u_int64_t tid);
static int swcr_freesession_locked(device_t dev, u_int64_t tid);
/*
* Apply a symmetric encryption/decryption algorithm.
*/
static int
swcr_encdec(struct cryptodesc *crd, struct swcr_data *sw, caddr_t buf,
int flags)
{
unsigned char iv[EALG_MAX_BLOCK_LEN], blk[EALG_MAX_BLOCK_LEN], *idat;
unsigned char *ivp, *nivp, iv2[EALG_MAX_BLOCK_LEN];
struct enc_xform *exf;
int i, j, k, blks, ind, count, ivlen;
struct uio *uio, uiolcl;
struct iovec iovlcl[4];
struct iovec *iov;
int iovcnt, iovalloc;
int error;
error = 0;
exf = sw->sw_exf;
blks = exf->blocksize;
ivlen = exf->ivsize;
/* Check for non-padded data */
if (crd->crd_len % blks)
return EINVAL;
if (crd->crd_alg == CRYPTO_AES_ICM &&
(crd->crd_flags & CRD_F_IV_EXPLICIT) == 0)
return (EINVAL);
/* Initialize the IV */
if (crd->crd_flags & CRD_F_ENCRYPT) {
/* IV explicitly provided ? */
if (crd->crd_flags & CRD_F_IV_EXPLICIT)
bcopy(crd->crd_iv, iv, ivlen);
else
arc4rand(iv, ivlen, 0);
/* Do we need to write the IV */
if (!(crd->crd_flags & CRD_F_IV_PRESENT))
crypto_copyback(flags, buf, crd->crd_inject, ivlen, iv);
} else { /* Decryption */
/* IV explicitly provided ? */
if (crd->crd_flags & CRD_F_IV_EXPLICIT)
bcopy(crd->crd_iv, iv, ivlen);
else {
/* Get IV off buf */
crypto_copydata(flags, buf, crd->crd_inject, ivlen, iv);
}
}
if (crd->crd_flags & CRD_F_KEY_EXPLICIT) {
int error;
if (sw->sw_kschedule)
exf->zerokey(&(sw->sw_kschedule));
error = exf->setkey(&sw->sw_kschedule,
crd->crd_key, crd->crd_klen / 8);
if (error)
return (error);
}
iov = iovlcl;
iovcnt = nitems(iovlcl);
iovalloc = 0;
uio = &uiolcl;
if ((flags & CRYPTO_F_IMBUF) != 0) {
error = crypto_mbuftoiov((struct mbuf *)buf, &iov, &iovcnt,
&iovalloc);
if (error)
return (error);
uio->uio_iov = iov;
uio->uio_iovcnt = iovcnt;
} else if ((flags & CRYPTO_F_IOV) != 0)
uio = (struct uio *)buf;
else {
iov[0].iov_base = buf;
iov[0].iov_len = crd->crd_skip + crd->crd_len;
uio->uio_iov = iov;
uio->uio_iovcnt = 1;
}
ivp = iv;
if (exf->reinit) {
/*
* xforms that provide a reinit method perform all IV
* handling themselves.
*/
exf->reinit(sw->sw_kschedule, iv);
}
count = crd->crd_skip;
ind = cuio_getptr(uio, count, &k);
if (ind == -1) {
error = EINVAL;
goto out;
}
i = crd->crd_len;
while (i > 0) {
/*
* If there's insufficient data at the end of
* an iovec, we have to do some copying.
*/
if (uio->uio_iov[ind].iov_len < k + blks &&
uio->uio_iov[ind].iov_len != k) {
cuio_copydata(uio, count, blks, blk);
/* Actual encryption/decryption */
if (exf->reinit) {
if (crd->crd_flags & CRD_F_ENCRYPT) {
exf->encrypt(sw->sw_kschedule,
blk);
} else {
exf->decrypt(sw->sw_kschedule,
blk);
}
} else if (crd->crd_flags & CRD_F_ENCRYPT) {
/* XOR with previous block */
for (j = 0; j < blks; j++)
blk[j] ^= ivp[j];
exf->encrypt(sw->sw_kschedule, blk);
/*
* Keep encrypted block for XOR'ing
* with next block
*/
bcopy(blk, iv, blks);
ivp = iv;
} else { /* decrypt */
/*
* Keep encrypted block for XOR'ing
* with next block
*/
nivp = (ivp == iv) ? iv2 : iv;
bcopy(blk, nivp, blks);
exf->decrypt(sw->sw_kschedule, blk);
/* XOR with previous block */
for (j = 0; j < blks; j++)
blk[j] ^= ivp[j];
ivp = nivp;
}
/* Copy back decrypted block */
cuio_copyback(uio, count, blks, blk);
count += blks;
/* Advance pointer */
ind = cuio_getptr(uio, count, &k);
if (ind == -1) {
error = EINVAL;
goto out;
}
i -= blks;
/* Could be done... */
if (i == 0)
break;
}
/*
* Warning: idat may point to garbage here, but
* we only use it in the while() loop, only if
* there are indeed enough data.
*/
idat = (char *)uio->uio_iov[ind].iov_base + k;
while (uio->uio_iov[ind].iov_len >= k + blks && i > 0) {
if (exf->reinit) {
if (crd->crd_flags & CRD_F_ENCRYPT) {
exf->encrypt(sw->sw_kschedule,
idat);
} else {
exf->decrypt(sw->sw_kschedule,
idat);
}
} else if (crd->crd_flags & CRD_F_ENCRYPT) {
/* XOR with previous block/IV */
for (j = 0; j < blks; j++)
idat[j] ^= ivp[j];
exf->encrypt(sw->sw_kschedule, idat);
ivp = idat;
} else { /* decrypt */
/*
* Keep encrypted block to be used
* in next block's processing.
*/
nivp = (ivp == iv) ? iv2 : iv;
bcopy(idat, nivp, blks);
exf->decrypt(sw->sw_kschedule, idat);
/* XOR with previous block/IV */
for (j = 0; j < blks; j++)
idat[j] ^= ivp[j];
ivp = nivp;
}
idat += blks;
count += blks;
k += blks;
i -= blks;
}
/*
* Advance to the next iov if the end of the current iov
* is aligned with the end of a cipher block.
* Note that the code is equivalent to calling:
* ind = cuio_getptr(uio, count, &k);
*/
if (i > 0 && k == uio->uio_iov[ind].iov_len) {
k = 0;
ind++;
if (ind >= uio->uio_iovcnt) {
error = EINVAL;
goto out;
}
}
}
out:
if (iovalloc)
free(iov, M_CRYPTO_DATA);
return (error);
}
static void
swcr_authprepare(struct auth_hash *axf, struct swcr_data *sw, u_char *key,
int klen)
{
int k;
klen /= 8;
switch (axf->type) {
case CRYPTO_MD5_HMAC:
case CRYPTO_SHA1_HMAC:
case CRYPTO_SHA2_256_HMAC:
case CRYPTO_SHA2_384_HMAC:
case CRYPTO_SHA2_512_HMAC:
case CRYPTO_NULL_HMAC:
case CRYPTO_RIPEMD160_HMAC:
for (k = 0; k < klen; k++)
key[k] ^= HMAC_IPAD_VAL;
axf->Init(sw->sw_ictx);
axf->Update(sw->sw_ictx, key, klen);
axf->Update(sw->sw_ictx, hmac_ipad_buffer, axf->blocksize - klen);
for (k = 0; k < klen; k++)
key[k] ^= (HMAC_IPAD_VAL ^ HMAC_OPAD_VAL);
axf->Init(sw->sw_octx);
axf->Update(sw->sw_octx, key, klen);
axf->Update(sw->sw_octx, hmac_opad_buffer, axf->blocksize - klen);
for (k = 0; k < klen; k++)
key[k] ^= HMAC_OPAD_VAL;
break;
case CRYPTO_MD5_KPDK:
case CRYPTO_SHA1_KPDK:
{
/*
* We need a buffer that can hold an md5 and a sha1 result
* just to throw it away.
* What we do here is the initial part of:
* ALGO( key, keyfill, .. )
* adding the key to sw_ictx and abusing Final() to get the
* "keyfill" padding.
* In addition we abuse the sw_octx to save the key to have
* it to be able to append it at the end in swcr_authcompute().
*/
u_char buf[SHA1_RESULTLEN];
sw->sw_klen = klen;
bcopy(key, sw->sw_octx, klen);
axf->Init(sw->sw_ictx);
axf->Update(sw->sw_ictx, key, klen);
axf->Final(buf, sw->sw_ictx);
break;
}
default:
printf("%s: CRD_F_KEY_EXPLICIT flag given, but algorithm %d "
"doesn't use keys.\n", __func__, axf->type);
}
}
/*
* Compute keyed-hash authenticator.
*/
static int
swcr_authcompute(struct cryptodesc *crd, struct swcr_data *sw, caddr_t buf,
int flags)
{
unsigned char aalg[HASH_MAX_LEN];
struct auth_hash *axf;
union authctx ctx;
int err;
if (sw->sw_ictx == 0)
return EINVAL;
axf = sw->sw_axf;
if (crd->crd_flags & CRD_F_KEY_EXPLICIT)
swcr_authprepare(axf, sw, crd->crd_key, crd->crd_klen);
bcopy(sw->sw_ictx, &ctx, axf->ctxsize);
err = crypto_apply(flags, buf, crd->crd_skip, crd->crd_len,
(int (*)(void *, void *, unsigned int))axf->Update, (caddr_t)&ctx);
if (err)
return err;
switch (sw->sw_alg) {
case CRYPTO_MD5_HMAC:
case CRYPTO_SHA1_HMAC:
case CRYPTO_SHA2_256_HMAC:
case CRYPTO_SHA2_384_HMAC:
case CRYPTO_SHA2_512_HMAC:
case CRYPTO_RIPEMD160_HMAC:
if (sw->sw_octx == NULL)
return EINVAL;
axf->Final(aalg, &ctx);
bcopy(sw->sw_octx, &ctx, axf->ctxsize);
axf->Update(&ctx, aalg, axf->hashsize);
axf->Final(aalg, &ctx);
break;
case CRYPTO_MD5_KPDK:
case CRYPTO_SHA1_KPDK:
/* If we have no key saved, return error. */
if (sw->sw_octx == NULL)
return EINVAL;
/*
* Add the trailing copy of the key (see comment in
* swcr_authprepare()) after the data:
* ALGO( .., key, algofill )
* and let Final() do the proper, natural "algofill"
* padding.
*/
axf->Update(&ctx, sw->sw_octx, sw->sw_klen);
axf->Final(aalg, &ctx);
break;
case CRYPTO_NULL_HMAC:
axf->Final(aalg, &ctx);
break;
}
/* Inject the authentication data */
crypto_copyback(flags, buf, crd->crd_inject,
sw->sw_mlen == 0 ? axf->hashsize : sw->sw_mlen, aalg);
return 0;
}
CTASSERT(INT_MAX <= (1ll<<39) - 256); /* GCM: plain text < 2^39-256 */
CTASSERT(INT_MAX <= (uint64_t)-1); /* GCM: associated data <= 2^64-1 */
/*
* Apply a combined encryption-authentication transformation
*/
static int
swcr_authenc(struct cryptop *crp)
{
uint32_t blkbuf[howmany(EALG_MAX_BLOCK_LEN, sizeof(uint32_t))];
u_char *blk = (u_char *)blkbuf;
u_char aalg[AALG_MAX_RESULT_LEN];
u_char uaalg[AALG_MAX_RESULT_LEN];
u_char iv[EALG_MAX_BLOCK_LEN];
union authctx ctx;
struct cryptodesc *crd, *crda = NULL, *crde = NULL;
struct swcr_data *sw, *swa, *swe = NULL;
struct auth_hash *axf = NULL;
struct enc_xform *exf = NULL;
caddr_t buf = (caddr_t)crp->crp_buf;
uint32_t *blkp;
int aadlen, blksz, i, ivlen, len, iskip, oskip, r;
ivlen = blksz = iskip = oskip = 0;
for (crd = crp->crp_desc; crd; crd = crd->crd_next) {
for (sw = swcr_sessions[crp->crp_sid & 0xffffffff];
sw && sw->sw_alg != crd->crd_alg;
sw = sw->sw_next)
;
if (sw == NULL)
return (EINVAL);
switch (sw->sw_alg) {
case CRYPTO_AES_NIST_GCM_16:
case CRYPTO_AES_NIST_GMAC:
swe = sw;
crde = crd;
exf = swe->sw_exf;
ivlen = 12;
break;
case CRYPTO_AES_128_NIST_GMAC:
case CRYPTO_AES_192_NIST_GMAC:
case CRYPTO_AES_256_NIST_GMAC:
swa = sw;
crda = crd;
axf = swa->sw_axf;
if (swa->sw_ictx == 0)
return (EINVAL);
bcopy(swa->sw_ictx, &ctx, axf->ctxsize);
blksz = axf->blocksize;
break;
default:
return (EINVAL);
}
}
if (crde == NULL || crda == NULL)
return (EINVAL);
if (crde->crd_alg == CRYPTO_AES_NIST_GCM_16 &&
(crde->crd_flags & CRD_F_IV_EXPLICIT) == 0)
return (EINVAL);
if (crde->crd_klen != crda->crd_klen)
return (EINVAL);
/* Initialize the IV */
if (crde->crd_flags & CRD_F_ENCRYPT) {
/* IV explicitly provided ? */
if (crde->crd_flags & CRD_F_IV_EXPLICIT)
bcopy(crde->crd_iv, iv, ivlen);
else
arc4rand(iv, ivlen, 0);
/* Do we need to write the IV */
if (!(crde->crd_flags & CRD_F_IV_PRESENT))
crypto_copyback(crp->crp_flags, buf, crde->crd_inject,
ivlen, iv);
} else { /* Decryption */
/* IV explicitly provided ? */
if (crde->crd_flags & CRD_F_IV_EXPLICIT)
bcopy(crde->crd_iv, iv, ivlen);
else {
/* Get IV off buf */
crypto_copydata(crp->crp_flags, buf, crde->crd_inject,
ivlen, iv);
}
}
/* Supply MAC with IV */
if (axf->Reinit)
axf->Reinit(&ctx, iv, ivlen);
/* Supply MAC with AAD */
aadlen = crda->crd_len;
for (i = iskip; i < crda->crd_len; i += blksz) {
len = MIN(crda->crd_len - i, blksz - oskip);
crypto_copydata(crp->crp_flags, buf, crda->crd_skip + i, len,
blk + oskip);
bzero(blk + len + oskip, blksz - len - oskip);
axf->Update(&ctx, blk, blksz);
oskip = 0; /* reset initial output offset */
}
if (exf->reinit)
exf->reinit(swe->sw_kschedule, iv);
/* Do encryption/decryption with MAC */
for (i = 0; i < crde->crd_len; i += blksz) {
len = MIN(crde->crd_len - i, blksz);
if (len < blksz)
bzero(blk, blksz);
crypto_copydata(crp->crp_flags, buf, crde->crd_skip + i, len,
blk);
if (crde->crd_flags & CRD_F_ENCRYPT) {
exf->encrypt(swe->sw_kschedule, blk);
axf->Update(&ctx, blk, len);
crypto_copyback(crp->crp_flags, buf,
crde->crd_skip + i, len, blk);
} else {
axf->Update(&ctx, blk, len);
}
}
/* Do any required special finalization */
switch (crda->crd_alg) {
case CRYPTO_AES_128_NIST_GMAC:
case CRYPTO_AES_192_NIST_GMAC:
case CRYPTO_AES_256_NIST_GMAC:
/* length block */
bzero(blk, blksz);
blkp = (uint32_t *)blk + 1;
*blkp = htobe32(aadlen * 8);
blkp = (uint32_t *)blk + 3;
*blkp = htobe32(crde->crd_len * 8);
axf->Update(&ctx, blk, blksz);
break;
}
/* Finalize MAC */
axf->Final(aalg, &ctx);
/* Validate tag */
if (!(crde->crd_flags & CRD_F_ENCRYPT)) {
crypto_copydata(crp->crp_flags, buf, crda->crd_inject,
axf->hashsize, uaalg);
r = timingsafe_bcmp(aalg, uaalg, axf->hashsize);
if (r == 0) {
/* tag matches, decrypt data */
for (i = 0; i < crde->crd_len; i += blksz) {
len = MIN(crde->crd_len - i, blksz);
if (len < blksz)
bzero(blk, blksz);
crypto_copydata(crp->crp_flags, buf,
crde->crd_skip + i, len, blk);
if (!(crde->crd_flags & CRD_F_ENCRYPT)) {
exf->decrypt(swe->sw_kschedule, blk);
}
crypto_copyback(crp->crp_flags, buf,
crde->crd_skip + i, len, blk);
}
} else
return (EBADMSG);
} else {
/* Inject the authentication data */
crypto_copyback(crp->crp_flags, buf, crda->crd_inject,
axf->hashsize, aalg);
}
return (0);
}
/*
* Apply a compression/decompression algorithm
*/
static int
swcr_compdec(struct cryptodesc *crd, struct swcr_data *sw,
caddr_t buf, int flags)
{
u_int8_t *data, *out;
struct comp_algo *cxf;
int adj;
u_int32_t result;
cxf = sw->sw_cxf;
/* We must handle the whole buffer of data in one time
* then if there is not all the data in the mbuf, we must
* copy in a buffer.
*/
data = malloc(crd->crd_len, M_CRYPTO_DATA, M_NOWAIT);
if (data == NULL)
return (EINVAL);
crypto_copydata(flags, buf, crd->crd_skip, crd->crd_len, data);
if (crd->crd_flags & CRD_F_COMP)
result = cxf->compress(data, crd->crd_len, &out);
else
result = cxf->decompress(data, crd->crd_len, &out);
free(data, M_CRYPTO_DATA);
if (result == 0)
return EINVAL;
/* Copy back the (de)compressed data. m_copyback is
* extending the mbuf as necessary.
*/
sw->sw_size = result;
/* Check the compressed size when doing compression */
if (crd->crd_flags & CRD_F_COMP) {
if (result >= crd->crd_len) {
/* Compression was useless, we lost time */
free(out, M_CRYPTO_DATA);
return 0;
}
}
crypto_copyback(flags, buf, crd->crd_skip, result, out);
if (result < crd->crd_len) {
adj = result - crd->crd_len;
if (flags & CRYPTO_F_IMBUF) {
adj = result - crd->crd_len;
m_adj((struct mbuf *)buf, adj);
} else if (flags & CRYPTO_F_IOV) {
struct uio *uio = (struct uio *)buf;
int ind;
adj = crd->crd_len - result;
ind = uio->uio_iovcnt - 1;
while (adj > 0 && ind >= 0) {
if (adj < uio->uio_iov[ind].iov_len) {
uio->uio_iov[ind].iov_len -= adj;
break;
}
adj -= uio->uio_iov[ind].iov_len;
uio->uio_iov[ind].iov_len = 0;
ind--;
uio->uio_iovcnt--;
}
}
}
free(out, M_CRYPTO_DATA);
return 0;
}
/*
* Generate a new software session.
*/
static int
swcr_newsession(device_t dev, u_int32_t *sid, struct cryptoini *cri)
{
struct swcr_data **swd;
struct auth_hash *axf;
struct enc_xform *txf;
struct comp_algo *cxf;
u_int32_t i;
int len;
int error;
if (sid == NULL || cri == NULL)
return EINVAL;
rw_wlock(&swcr_sessions_lock);
if (swcr_sessions) {
for (i = 1; i < swcr_sesnum; i++)
if (swcr_sessions[i] == NULL)
break;
} else
i = 1; /* NB: to silence compiler warning */
if (swcr_sessions == NULL || i == swcr_sesnum) {
if (swcr_sessions == NULL) {
i = 1; /* We leave swcr_sessions[0] empty */
swcr_sesnum = CRYPTO_SW_SESSIONS;
} else
swcr_sesnum *= 2;
swd = malloc(swcr_sesnum * sizeof(struct swcr_data *),
M_CRYPTO_DATA, M_NOWAIT|M_ZERO);
if (swd == NULL) {
/* Reset session number */
if (swcr_sesnum == CRYPTO_SW_SESSIONS)
swcr_sesnum = 0;
else
swcr_sesnum /= 2;
rw_wunlock(&swcr_sessions_lock);
return ENOBUFS;
}
/* Copy existing sessions */
if (swcr_sessions != NULL) {
bcopy(swcr_sessions, swd,
(swcr_sesnum / 2) * sizeof(struct swcr_data *));
free(swcr_sessions, M_CRYPTO_DATA);
}
swcr_sessions = swd;
}
rw_downgrade(&swcr_sessions_lock);
swd = &swcr_sessions[i];
*sid = i;
while (cri) {
*swd = malloc(sizeof(struct swcr_data),
M_CRYPTO_DATA, M_NOWAIT|M_ZERO);
if (*swd == NULL) {
swcr_freesession_locked(dev, i);
rw_runlock(&swcr_sessions_lock);
return ENOBUFS;
}
switch (cri->cri_alg) {
case CRYPTO_DES_CBC:
txf = &enc_xform_des;
goto enccommon;
case CRYPTO_3DES_CBC:
txf = &enc_xform_3des;
goto enccommon;
case CRYPTO_BLF_CBC:
txf = &enc_xform_blf;
goto enccommon;
case CRYPTO_CAST_CBC:
txf = &enc_xform_cast5;
goto enccommon;
case CRYPTO_SKIPJACK_CBC:
txf = &enc_xform_skipjack;
goto enccommon;
case CRYPTO_RIJNDAEL128_CBC:
txf = &enc_xform_rijndael128;
goto enccommon;
case CRYPTO_AES_XTS:
txf = &enc_xform_aes_xts;
goto enccommon;
case CRYPTO_AES_ICM:
txf = &enc_xform_aes_icm;
goto enccommon;
case CRYPTO_AES_NIST_GCM_16:
txf = &enc_xform_aes_nist_gcm;
goto enccommon;
case CRYPTO_AES_NIST_GMAC:
txf = &enc_xform_aes_nist_gmac;
(*swd)->sw_exf = txf;
break;
case CRYPTO_CAMELLIA_CBC:
txf = &enc_xform_camellia;
goto enccommon;
case CRYPTO_NULL_CBC:
txf = &enc_xform_null;
goto enccommon;
enccommon:
if (cri->cri_key != NULL) {
error = txf->setkey(&((*swd)->sw_kschedule),
cri->cri_key, cri->cri_klen / 8);
if (error) {
swcr_freesession_locked(dev, i);
rw_runlock(&swcr_sessions_lock);
return error;
}
}
(*swd)->sw_exf = txf;
break;
case CRYPTO_MD5_HMAC:
axf = &auth_hash_hmac_md5;
goto authcommon;
case CRYPTO_SHA1_HMAC:
axf = &auth_hash_hmac_sha1;
goto authcommon;
case CRYPTO_SHA2_256_HMAC:
axf = &auth_hash_hmac_sha2_256;
goto authcommon;
case CRYPTO_SHA2_384_HMAC:
axf = &auth_hash_hmac_sha2_384;
goto authcommon;
case CRYPTO_SHA2_512_HMAC:
axf = &auth_hash_hmac_sha2_512;
goto authcommon;
case CRYPTO_NULL_HMAC:
axf = &auth_hash_null;
goto authcommon;
case CRYPTO_RIPEMD160_HMAC:
axf = &auth_hash_hmac_ripemd_160;
authcommon:
(*swd)->sw_ictx = malloc(axf->ctxsize, M_CRYPTO_DATA,
M_NOWAIT);
if ((*swd)->sw_ictx == NULL) {
swcr_freesession_locked(dev, i);
rw_runlock(&swcr_sessions_lock);
return ENOBUFS;
}
(*swd)->sw_octx = malloc(axf->ctxsize, M_CRYPTO_DATA,
M_NOWAIT);
if ((*swd)->sw_octx == NULL) {
swcr_freesession_locked(dev, i);
rw_runlock(&swcr_sessions_lock);
return ENOBUFS;
}
if (cri->cri_key != NULL) {
swcr_authprepare(axf, *swd, cri->cri_key,
cri->cri_klen);
}
(*swd)->sw_mlen = cri->cri_mlen;
(*swd)->sw_axf = axf;
break;
case CRYPTO_MD5_KPDK:
axf = &auth_hash_key_md5;
goto auth2common;
case CRYPTO_SHA1_KPDK:
axf = &auth_hash_key_sha1;
auth2common:
(*swd)->sw_ictx = malloc(axf->ctxsize, M_CRYPTO_DATA,
M_NOWAIT);
if ((*swd)->sw_ictx == NULL) {
swcr_freesession_locked(dev, i);
rw_runlock(&swcr_sessions_lock);
return ENOBUFS;
}
(*swd)->sw_octx = malloc(cri->cri_klen / 8,
M_CRYPTO_DATA, M_NOWAIT);
if ((*swd)->sw_octx == NULL) {
swcr_freesession_locked(dev, i);
rw_runlock(&swcr_sessions_lock);
return ENOBUFS;
}
/* Store the key so we can "append" it to the payload */
if (cri->cri_key != NULL) {
swcr_authprepare(axf, *swd, cri->cri_key,
cri->cri_klen);
}
(*swd)->sw_mlen = cri->cri_mlen;
(*swd)->sw_axf = axf;
break;
#ifdef notdef
case CRYPTO_MD5:
axf = &auth_hash_md5;
goto auth3common;
case CRYPTO_SHA1:
axf = &auth_hash_sha1;
auth3common:
(*swd)->sw_ictx = malloc(axf->ctxsize, M_CRYPTO_DATA,
M_NOWAIT);
if ((*swd)->sw_ictx == NULL) {
swcr_freesession_locked(dev, i);
rw_runlock(&swcr_sessions_lock);
return ENOBUFS;
}
axf->Init((*swd)->sw_ictx);
(*swd)->sw_mlen = cri->cri_mlen;
(*swd)->sw_axf = axf;
break;
#endif
case CRYPTO_AES_128_NIST_GMAC:
axf = &auth_hash_nist_gmac_aes_128;
goto auth4common;
case CRYPTO_AES_192_NIST_GMAC:
axf = &auth_hash_nist_gmac_aes_192;
goto auth4common;
case CRYPTO_AES_256_NIST_GMAC:
axf = &auth_hash_nist_gmac_aes_256;
auth4common:
len = cri->cri_klen / 8;
if (len != 16 && len != 24 && len != 32)
return EINVAL;
(*swd)->sw_ictx = malloc(axf->ctxsize, M_CRYPTO_DATA,
M_NOWAIT);
if ((*swd)->sw_ictx == NULL) {
swcr_freesession_locked(dev, i);
rw_runlock(&swcr_sessions_lock);
return ENOBUFS;
}
axf->Init((*swd)->sw_ictx);
axf->Setkey((*swd)->sw_ictx, cri->cri_key, len);
(*swd)->sw_axf = axf;
break;
case CRYPTO_DEFLATE_COMP:
cxf = &comp_algo_deflate;
(*swd)->sw_cxf = cxf;
break;
default:
swcr_freesession_locked(dev, i);
rw_runlock(&swcr_sessions_lock);
return EINVAL;
}
(*swd)->sw_alg = cri->cri_alg;
cri = cri->cri_next;
swd = &((*swd)->sw_next);
}
rw_runlock(&swcr_sessions_lock);
return 0;
}
static int
swcr_freesession(device_t dev, u_int64_t tid)
{
int error;
rw_rlock(&swcr_sessions_lock);
error = swcr_freesession_locked(dev, tid);
rw_runlock(&swcr_sessions_lock);
return error;
}
/*
* Free a session.
*/
static int
swcr_freesession_locked(device_t dev, u_int64_t tid)
{
struct swcr_data *swd;
struct enc_xform *txf;
struct auth_hash *axf;
struct comp_algo *cxf;
u_int32_t sid = CRYPTO_SESID2LID(tid);
if (sid > swcr_sesnum || swcr_sessions == NULL ||
swcr_sessions[sid] == NULL)
return EINVAL;
/* Silently accept and return */
if (sid == 0)
return 0;
while ((swd = swcr_sessions[sid]) != NULL) {
swcr_sessions[sid] = swd->sw_next;
switch (swd->sw_alg) {
case CRYPTO_DES_CBC:
case CRYPTO_3DES_CBC:
case CRYPTO_BLF_CBC:
case CRYPTO_CAST_CBC:
case CRYPTO_SKIPJACK_CBC:
case CRYPTO_RIJNDAEL128_CBC:
case CRYPTO_AES_XTS:
case CRYPTO_AES_ICM:
case CRYPTO_AES_NIST_GCM_16:
case CRYPTO_AES_NIST_GMAC:
case CRYPTO_CAMELLIA_CBC:
case CRYPTO_NULL_CBC:
txf = swd->sw_exf;
if (swd->sw_kschedule)
txf->zerokey(&(swd->sw_kschedule));
break;
case CRYPTO_MD5_HMAC:
case CRYPTO_SHA1_HMAC:
case CRYPTO_SHA2_256_HMAC:
case CRYPTO_SHA2_384_HMAC:
case CRYPTO_SHA2_512_HMAC:
case CRYPTO_RIPEMD160_HMAC:
case CRYPTO_NULL_HMAC:
axf = swd->sw_axf;
if (swd->sw_ictx) {
bzero(swd->sw_ictx, axf->ctxsize);
free(swd->sw_ictx, M_CRYPTO_DATA);
}
if (swd->sw_octx) {
bzero(swd->sw_octx, axf->ctxsize);
free(swd->sw_octx, M_CRYPTO_DATA);
}
break;
case CRYPTO_MD5_KPDK:
case CRYPTO_SHA1_KPDK:
axf = swd->sw_axf;
if (swd->sw_ictx) {
bzero(swd->sw_ictx, axf->ctxsize);
free(swd->sw_ictx, M_CRYPTO_DATA);
}
if (swd->sw_octx) {
bzero(swd->sw_octx, swd->sw_klen);
free(swd->sw_octx, M_CRYPTO_DATA);
}
break;
case CRYPTO_MD5:
case CRYPTO_SHA1:
axf = swd->sw_axf;
if (swd->sw_ictx)
free(swd->sw_ictx, M_CRYPTO_DATA);
break;
case CRYPTO_DEFLATE_COMP:
cxf = swd->sw_cxf;
break;
}
free(swd, M_CRYPTO_DATA);
}
return 0;
}
/*
* Process a software request.
*/
static int
swcr_process(device_t dev, struct cryptop *crp, int hint)
{
struct cryptodesc *crd;
struct swcr_data *sw;
u_int32_t lid;
/* Sanity check */
if (crp == NULL)
return EINVAL;
if (crp->crp_desc == NULL || crp->crp_buf == NULL) {
crp->crp_etype = EINVAL;
goto done;
}
lid = CRYPTO_SESID2LID(crp->crp_sid);
rw_rlock(&swcr_sessions_lock);
if (swcr_sessions == NULL || lid >= swcr_sesnum || lid == 0 ||
swcr_sessions[lid] == NULL) {
rw_runlock(&swcr_sessions_lock);
crp->crp_etype = ENOENT;
goto done;
}
rw_runlock(&swcr_sessions_lock);
/* Go through crypto descriptors, processing as we go */
for (crd = crp->crp_desc; crd; crd = crd->crd_next) {
/*
* Find the crypto context.
*
* XXX Note that the logic here prevents us from having
* XXX the same algorithm multiple times in a session
* XXX (or rather, we can but it won't give us the right
* XXX results). To do that, we'd need some way of differentiating
* XXX between the various instances of an algorithm (so we can
* XXX locate the correct crypto context).
*/
rw_rlock(&swcr_sessions_lock);
if (swcr_sessions == NULL) {
rw_runlock(&swcr_sessions_lock);
crp->crp_etype = ENOENT;
goto done;
}
for (sw = swcr_sessions[lid];
sw && sw->sw_alg != crd->crd_alg;
sw = sw->sw_next)
;
rw_runlock(&swcr_sessions_lock);
/* No such context ? */
if (sw == NULL) {
crp->crp_etype = EINVAL;
goto done;
}
switch (sw->sw_alg) {
case CRYPTO_DES_CBC:
case CRYPTO_3DES_CBC:
case CRYPTO_BLF_CBC:
case CRYPTO_CAST_CBC:
case CRYPTO_SKIPJACK_CBC:
case CRYPTO_RIJNDAEL128_CBC:
case CRYPTO_AES_XTS:
case CRYPTO_AES_ICM:
case CRYPTO_CAMELLIA_CBC:
if ((crp->crp_etype = swcr_encdec(crd, sw,
crp->crp_buf, crp->crp_flags)) != 0)
goto done;
break;
case CRYPTO_NULL_CBC:
crp->crp_etype = 0;
break;
case CRYPTO_MD5_HMAC:
case CRYPTO_SHA1_HMAC:
case CRYPTO_SHA2_256_HMAC:
case CRYPTO_SHA2_384_HMAC:
case CRYPTO_SHA2_512_HMAC:
case CRYPTO_RIPEMD160_HMAC:
case CRYPTO_NULL_HMAC:
case CRYPTO_MD5_KPDK:
case CRYPTO_SHA1_KPDK:
case CRYPTO_MD5:
case CRYPTO_SHA1:
if ((crp->crp_etype = swcr_authcompute(crd, sw,
crp->crp_buf, crp->crp_flags)) != 0)
goto done;
break;
case CRYPTO_AES_NIST_GCM_16:
case CRYPTO_AES_NIST_GMAC:
case CRYPTO_AES_128_NIST_GMAC:
case CRYPTO_AES_192_NIST_GMAC:
case CRYPTO_AES_256_NIST_GMAC:
crp->crp_etype = swcr_authenc(crp);
goto done;
case CRYPTO_DEFLATE_COMP:
if ((crp->crp_etype = swcr_compdec(crd, sw,
crp->crp_buf, crp->crp_flags)) != 0)
goto done;
else
crp->crp_olen = (int)sw->sw_size;
break;
default:
/* Unknown/unsupported algorithm */
crp->crp_etype = EINVAL;
goto done;
}
}
done:
crypto_done(crp);
return 0;
}
static void
swcr_identify(driver_t *drv, device_t parent)
{
/* NB: order 10 is so we get attached after h/w devices */
if (device_find_child(parent, "cryptosoft", -1) == NULL &&
BUS_ADD_CHILD(parent, 10, "cryptosoft", 0) == 0)
panic("cryptosoft: could not attach");
}
static int
swcr_probe(device_t dev)
{
device_set_desc(dev, "software crypto");
return (BUS_PROBE_NOWILDCARD);
}
static int
swcr_attach(device_t dev)
{
rw_init(&swcr_sessions_lock, "swcr_sessions_lock");
memset(hmac_ipad_buffer, HMAC_IPAD_VAL, HMAC_MAX_BLOCK_LEN);
memset(hmac_opad_buffer, HMAC_OPAD_VAL, HMAC_MAX_BLOCK_LEN);
swcr_id = crypto_get_driverid(dev,
CRYPTOCAP_F_SOFTWARE | CRYPTOCAP_F_SYNC);
if (swcr_id < 0) {
device_printf(dev, "cannot initialize!");
return ENOMEM;
}
#define REGISTER(alg) \
crypto_register(swcr_id, alg, 0,0)
REGISTER(CRYPTO_DES_CBC);
REGISTER(CRYPTO_3DES_CBC);
REGISTER(CRYPTO_BLF_CBC);
REGISTER(CRYPTO_CAST_CBC);
REGISTER(CRYPTO_SKIPJACK_CBC);
REGISTER(CRYPTO_NULL_CBC);
REGISTER(CRYPTO_MD5_HMAC);
REGISTER(CRYPTO_SHA1_HMAC);
REGISTER(CRYPTO_SHA2_256_HMAC);
REGISTER(CRYPTO_SHA2_384_HMAC);
REGISTER(CRYPTO_SHA2_512_HMAC);
REGISTER(CRYPTO_RIPEMD160_HMAC);
REGISTER(CRYPTO_NULL_HMAC);
REGISTER(CRYPTO_MD5_KPDK);
REGISTER(CRYPTO_SHA1_KPDK);
REGISTER(CRYPTO_MD5);
REGISTER(CRYPTO_SHA1);
REGISTER(CRYPTO_RIJNDAEL128_CBC);
REGISTER(CRYPTO_AES_XTS);
REGISTER(CRYPTO_AES_ICM);
REGISTER(CRYPTO_AES_NIST_GCM_16);
REGISTER(CRYPTO_AES_NIST_GMAC);
REGISTER(CRYPTO_AES_128_NIST_GMAC);
REGISTER(CRYPTO_AES_192_NIST_GMAC);
REGISTER(CRYPTO_AES_256_NIST_GMAC);
REGISTER(CRYPTO_CAMELLIA_CBC);
REGISTER(CRYPTO_DEFLATE_COMP);
#undef REGISTER
return 0;
}
static int
swcr_detach(device_t dev)
{
crypto_unregister_all(swcr_id);
rw_wlock(&swcr_sessions_lock);
free(swcr_sessions, M_CRYPTO_DATA);
swcr_sessions = NULL;
rw_wunlock(&swcr_sessions_lock);
rw_destroy(&swcr_sessions_lock);
return 0;
}
static device_method_t swcr_methods[] = {
DEVMETHOD(device_identify, swcr_identify),
DEVMETHOD(device_probe, swcr_probe),
DEVMETHOD(device_attach, swcr_attach),
DEVMETHOD(device_detach, swcr_detach),
DEVMETHOD(cryptodev_newsession, swcr_newsession),
DEVMETHOD(cryptodev_freesession,swcr_freesession),
DEVMETHOD(cryptodev_process, swcr_process),
{0, 0},
};
static driver_t swcr_driver = {
"cryptosoft",
swcr_methods,
0, /* NB: no softc */
};
static devclass_t swcr_devclass;
/*
* NB: We explicitly reference the crypto module so we
* get the necessary ordering when built as a loadable
* module. This is required because we bundle the crypto
* module code together with the cryptosoft driver (otherwise
* normal module dependencies would handle things).
*/
extern int crypto_modevent(struct module *, int, void *);
/* XXX where to attach */
DRIVER_MODULE(cryptosoft, nexus, swcr_driver, swcr_devclass, crypto_modevent,0);
MODULE_VERSION(cryptosoft, 1);
MODULE_DEPEND(cryptosoft, crypto, 1, 1, 1);
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