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/*
* hmac.c
*
* MontaVista RMCP+ code for doing HMAC, both SHA1 and MD5
*
* Author: MontaVista Software, Inc.
* Corey Minyard <minyard@mvista.com>
* source@mvista.com
*
* Copyright 2004 MontaVista Software Inc.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
*
* THIS SOFTWARE IS PROVIDED ``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.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this program; if not, write to the Free
* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifdef HAVE_OPENSSL
#include <errno.h>
#include <string.h>
#include <openssl/hmac.h>
#include <OpenIPMI/ipmi_lan.h>
#include <OpenIPMI/internal/ipmi_malloc.h>
typedef struct hmac_info_s
{
const EVP_MD *evp_md;
unsigned int klen;
unsigned int ilen;
unsigned char k[20];
} hmac_info_t;
static int
hmac_sha1_init(ipmi_con_t *ipmi,
ipmi_rmcpp_auth_t *ainfo,
void **integ_data)
{
hmac_info_t *info;
static unsigned char *k;
unsigned int klen;
info = ipmi_mem_alloc(sizeof(*info));
if (!info)
return ENOMEM;
if (ipmi_rmcpp_auth_get_sik_len(ainfo) < 20)
return EINVAL;
if (ipmi->hacks & IPMI_CONN_HACK_RMCPP_INTEG_SIK)
k = ipmi_rmcpp_auth_get_sik(ainfo, &klen);
else
k = ipmi_rmcpp_auth_get_k1(ainfo, &klen);
if (klen < 20)
return EINVAL;
memcpy(info->k, k, 20);
info->klen = 20;
info->ilen = 12;
info->evp_md = EVP_sha1();
*integ_data = info;
return 0;
}
static int
hmac_md5_init(ipmi_con_t *ipmi,
ipmi_rmcpp_auth_t *ainfo,
void **integ_data)
{
hmac_info_t *info;
const unsigned char *k;
unsigned int klen;
info = ipmi_mem_alloc(sizeof(*info));
if (!info)
return ENOMEM;
k = ipmi_rmcpp_auth_get_password(ainfo, &klen);
if (klen < 16)
return EINVAL;
memcpy(info->k, k, 16);
info->klen = 16;
info->ilen = 16;
info->evp_md = EVP_md5();
*integ_data = info;
return 0;
}
static void
hmac_free(ipmi_con_t *ipmi,
void *integ_data)
{
hmac_info_t *info = integ_data;
memset(info->k, 0, sizeof(info->k));
ipmi_mem_free(integ_data);
}
static int
hmac_pad(ipmi_con_t *ipmi,
void *integ_data,
unsigned char *payload,
unsigned int *payload_len,
unsigned int max_payload_len)
{
unsigned char *p = payload;
unsigned int l = *payload_len;
unsigned int count = 0;
/* Pad so that when we add two bytes (the pad length and the next
header) the result is on a multiple of 4 boundary. */
while (((l+2) % 4) != 0) {
if (l == max_payload_len)
return E2BIG;
p[l] = 0xff;
l++;
count++;
}
/* Add the padding length. The next header gets added later. */
if (l == max_payload_len)
return E2BIG;
p[l] = count;
l++;
*payload_len = l;
return 0;
}
static int
hmac_add(ipmi_con_t *ipmi,
void *integ_data,
unsigned char *payload,
unsigned int *payload_len,
unsigned int max_payload_len)
{
hmac_info_t *info = integ_data;
unsigned char *p = payload;
unsigned int l = *payload_len;
unsigned int ilen;
unsigned char integ[20];
if (l+info->ilen+1 > max_payload_len)
return E2BIG;
if (l < 4)
return E2BIG;
p[l] = 0x07; /* Add the next header */
l++;
HMAC(info->evp_md, info->k, info->klen, p+4, l-4, integ, &ilen);
memcpy(p+l, integ, ilen);
l += info->ilen;
*payload_len = l;
return 0;
}
static int
hmac_check(ipmi_con_t *ipmi,
void *integ_data,
unsigned char *payload,
unsigned int payload_len,
unsigned int total_len)
{
hmac_info_t *info = integ_data;
unsigned char *p = payload;
unsigned int l = payload_len;
unsigned int ilen;
unsigned char new_integ[20];
/* We don't authenticate this part of the header. */
p += 4;
l -= 4;
if ((total_len - payload_len) < info->ilen+1)
return EINVAL;
/* We add 1 to the length because we also check the next header
field. */
HMAC(info->evp_md, info->k, info->klen, p, l+1, new_integ, &ilen);
if (memcmp(new_integ, p+l+1, info->ilen) != 0)
return EINVAL;
return 0;
}
static ipmi_rmcpp_integrity_t hmac_sha1_integ =
{
.integ_init = hmac_sha1_init,
.integ_free = hmac_free,
.integ_pad = hmac_pad,
.integ_add = hmac_add,
.integ_check = hmac_check
};
static ipmi_rmcpp_integrity_t hmac_md5_integ =
{
.integ_init = hmac_md5_init,
.integ_free = hmac_free,
.integ_pad = hmac_pad,
.integ_add = hmac_add,
.integ_check = hmac_check
};
#endif /* HAVE_OPENSSL */
int
_ipmi_hmac_init(void)
{
#ifdef HAVE_OPENSSL
int rv = 0;
rv = ipmi_rmcpp_register_integrity
(IPMI_LANP_INTEGRITY_ALGORITHM_HMAC_SHA1_96, &hmac_sha1_integ);
if (rv)
return rv;
rv = ipmi_rmcpp_register_integrity
(IPMI_LANP_INTEGRITY_ALGORITHM_HMAC_MD5_128, &hmac_md5_integ);
if (rv)
return rv;
#endif
return 0;
}
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