mirror of git://anongit.mindrot.org/openssh.git
115 lines
3.3 KiB
C
115 lines
3.3 KiB
C
/*
|
|
* Copyright (c) 2001 Markus Friedl. All rights reserved.
|
|
*
|
|
* 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.
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
#include "includes.h"
|
|
RCSID("$OpenBSD: mac.c,v 1.3 2001/12/19 07:18:56 deraadt Exp $");
|
|
|
|
#include <openssl/hmac.h>
|
|
|
|
#include "xmalloc.h"
|
|
#include "getput.h"
|
|
#include "log.h"
|
|
#include "cipher.h"
|
|
#include "kex.h"
|
|
#include "mac.h"
|
|
|
|
struct {
|
|
char *name;
|
|
EVP_MD * (*mdfunc)(void);
|
|
int truncatebits; /* truncate digest if != 0 */
|
|
} macs[] = {
|
|
{ "hmac-sha1", EVP_sha1, 0, },
|
|
{ "hmac-sha1-96", EVP_sha1, 96 },
|
|
{ "hmac-md5", EVP_md5, 0 },
|
|
{ "hmac-md5-96", EVP_md5, 96 },
|
|
{ "hmac-ripemd160", EVP_ripemd160, 0 },
|
|
{ "hmac-ripemd160@openssh.com", EVP_ripemd160, 0 },
|
|
{ NULL, NULL, 0 }
|
|
};
|
|
|
|
int
|
|
mac_init(Mac *mac, char *name)
|
|
{
|
|
int i;
|
|
for (i = 0; macs[i].name; i++) {
|
|
if (strcmp(name, macs[i].name) == 0) {
|
|
if (mac != NULL) {
|
|
mac->md = (*macs[i].mdfunc)();
|
|
mac->key_len = mac->mac_len = mac->md->md_size;
|
|
if (macs[i].truncatebits != 0)
|
|
mac->mac_len = macs[i].truncatebits/8;
|
|
}
|
|
debug2("mac_init: found %s", name);
|
|
return (0);
|
|
}
|
|
}
|
|
debug2("mac_init: unknown %s", name);
|
|
return (-1);
|
|
}
|
|
|
|
u_char *
|
|
mac_compute(Mac *mac, u_int32_t seqno, u_char *data, int datalen)
|
|
{
|
|
HMAC_CTX c;
|
|
static u_char m[EVP_MAX_MD_SIZE];
|
|
u_char b[4];
|
|
|
|
if (mac->key == NULL)
|
|
fatal("mac_compute: no key");
|
|
if (mac->mac_len > sizeof(m))
|
|
fatal("mac_compute: mac too long");
|
|
HMAC_Init(&c, mac->key, mac->key_len, mac->md);
|
|
PUT_32BIT(b, seqno);
|
|
HMAC_Update(&c, b, sizeof(b));
|
|
HMAC_Update(&c, data, datalen);
|
|
HMAC_Final(&c, m, NULL);
|
|
HMAC_cleanup(&c);
|
|
return (m);
|
|
}
|
|
|
|
/* XXX copied from ciphers_valid */
|
|
#define MAC_SEP ","
|
|
int
|
|
mac_valid(const char *names)
|
|
{
|
|
char *maclist, *cp, *p;
|
|
|
|
if (names == NULL || strcmp(names, "") == 0)
|
|
return (0);
|
|
maclist = cp = xstrdup(names);
|
|
for ((p = strsep(&cp, MAC_SEP)); p && *p != '\0';
|
|
(p = strsep(&cp, MAC_SEP))) {
|
|
if (mac_init(NULL, p) < 0) {
|
|
debug("bad mac %s [%s]", p, names);
|
|
xfree(maclist);
|
|
return (0);
|
|
} else {
|
|
debug3("mac ok: %s [%s]", p, names);
|
|
}
|
|
}
|
|
debug3("macs ok: [%s]", names);
|
|
xfree(maclist);
|
|
return (1);
|
|
}
|