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/* $OpenBSD: vendor.c,v 1.6 2017/11/08 13:33:49 patrick Exp $ */
/*
* Copyright (c) 2006 Hans-Joerg Hoexer <hshoexer@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <stdlib.h>
#include <string.h>
#include "exchange.h"
#include "hash.h"
#include "log.h"
#include "message.h"
#include "vendor.h"
static struct vendor_cap openbsd_vendor_cap[] = {
{ "OpenBSD-6.3", NULL, 0 },
};
#define NUMVIDS (sizeof openbsd_vendor_cap / sizeof openbsd_vendor_cap[0])
static int
setup_vendor_hashes(void)
{
struct hash *hash;
int i, n = NUMVIDS;
hash = hash_get(HASH_MD5);
if (!hash) {
log_print("setup_vendor_hashes: could not find MD5 hash");
return -1;
}
for (i = 0; i < n; i++) {
openbsd_vendor_cap[i].hashsize = hash->hashsize;
openbsd_vendor_cap[i].hash = calloc(hash->hashsize,
sizeof(u_int8_t));
if (openbsd_vendor_cap[i].hash == NULL) {
log_error("setup_vendor_hashes: calloc failed");
goto errout;
}
hash->Init(hash->ctx);
hash->Update(hash->ctx,
(unsigned char *)openbsd_vendor_cap[i].text,
strlen(openbsd_vendor_cap[i].text));
hash->Final(openbsd_vendor_cap[i].hash, hash->ctx);
LOG_DBG((LOG_EXCHANGE, 50, "setup_vendor_hashes: "
"MD5(\"%s\") (%lu bytes)", openbsd_vendor_cap[i].text,
(unsigned long)hash->hashsize));
LOG_DBG_BUF((LOG_EXCHANGE, 50, "setup_vendor_hashes",
openbsd_vendor_cap[i].hash, hash->hashsize));
}
return 0;
errout:
for (i = 0; i < n; i++)
free(openbsd_vendor_cap[i].hash);
return -1;
}
void
vendor_init(void)
{
setup_vendor_hashes();
}
int
add_vendor_openbsd(struct message *msg)
{
u_int8_t *buf;
size_t buflen;
int i, n = NUMVIDS;
for (i = 0; i < n; i++) {
buflen = openbsd_vendor_cap[i].hashsize + ISAKMP_GEN_SZ;
if ((buf = calloc(buflen, sizeof(char))) == NULL) {
log_error("add_vendor_payload: calloc(%lu) failed",
(unsigned long)buflen);
return -1;
}
SET_ISAKMP_GEN_LENGTH(buf, buflen);
memcpy(buf + ISAKMP_VENDOR_ID_OFF, openbsd_vendor_cap[i].hash,
openbsd_vendor_cap[i].hashsize);
if (message_add_payload(msg, ISAKMP_PAYLOAD_VENDOR, buf,
buflen, 1)) {
free(buf);
return -1;
}
}
return 0;
}
void
check_vendor_openbsd(struct message *msg, struct payload *p)
{
u_int8_t *pbuf = p->p;
ssize_t vlen;
int i, n = NUMVIDS;
if (msg->exchange->flags & EXCHANGE_FLAG_OPENBSD) {
p->flags |= PL_MARK;
return;
}
vlen = GET_ISAKMP_GEN_LENGTH(pbuf) - ISAKMP_GEN_SZ;
for (i = 0; i < n; i++) {
if (vlen != openbsd_vendor_cap[i].hashsize) {
LOG_DBG((LOG_EXCHANGE, 90,
"check_vendor_openbsd: bad size %lu != %lu",
(unsigned long)vlen,
(unsigned long)openbsd_vendor_cap[i].hashsize));
continue;
}
if (memcmp(openbsd_vendor_cap[i].hash, pbuf + ISAKMP_GEN_SZ,
vlen) == 0) {
msg->exchange->flags |= EXCHANGE_FLAG_OPENBSD;
LOG_DBG((LOG_EXCHANGE, 10, "check_vendor_openbsd: "
"OpenBSD (%s)", openbsd_vendor_cap[i].text));
}
p->flags |= PL_MARK;
}
}
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