mirror of git://anongit.mindrot.org/openssh.git
247 lines
6.9 KiB
C
247 lines
6.9 KiB
C
/* $OpenBSD: mac.c,v 1.28 2014/02/07 06:55:54 djm Exp $ */
|
|
/*
|
|
* 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"
|
|
|
|
#include <sys/types.h>
|
|
|
|
#include <stdarg.h>
|
|
#include <string.h>
|
|
#include <signal.h>
|
|
|
|
#include "xmalloc.h"
|
|
#include "log.h"
|
|
#include "cipher.h"
|
|
#include "buffer.h"
|
|
#include "key.h"
|
|
#include "kex.h"
|
|
#include "mac.h"
|
|
#include "misc.h"
|
|
|
|
#include "digest.h"
|
|
#include "hmac.h"
|
|
#include "umac.h"
|
|
|
|
#include "openbsd-compat/openssl-compat.h"
|
|
|
|
#define SSH_DIGEST 1 /* SSH_DIGEST_XXX */
|
|
#define SSH_UMAC 2 /* UMAC (not integrated with OpenSSL) */
|
|
#define SSH_UMAC128 3
|
|
|
|
struct macalg {
|
|
char *name;
|
|
int type;
|
|
int alg;
|
|
int truncatebits; /* truncate digest if != 0 */
|
|
int key_len; /* just for UMAC */
|
|
int len; /* just for UMAC */
|
|
int etm; /* Encrypt-then-MAC */
|
|
};
|
|
|
|
static const struct macalg macs[] = {
|
|
/* Encrypt-and-MAC (encrypt-and-authenticate) variants */
|
|
{ "hmac-sha1", SSH_DIGEST, SSH_DIGEST_SHA1, 0, 0, 0, 0 },
|
|
{ "hmac-sha1-96", SSH_DIGEST, SSH_DIGEST_SHA1, 96, 0, 0, 0 },
|
|
#ifdef HAVE_EVP_SHA256
|
|
{ "hmac-sha2-256", SSH_DIGEST, SSH_DIGEST_SHA256, 0, 0, 0, 0 },
|
|
{ "hmac-sha2-512", SSH_DIGEST, SSH_DIGEST_SHA512, 0, 0, 0, 0 },
|
|
#endif
|
|
{ "hmac-md5", SSH_DIGEST, SSH_DIGEST_MD5, 0, 0, 0, 0 },
|
|
{ "hmac-md5-96", SSH_DIGEST, SSH_DIGEST_MD5, 96, 0, 0, 0 },
|
|
{ "hmac-ripemd160", SSH_DIGEST, SSH_DIGEST_RIPEMD160, 0, 0, 0, 0 },
|
|
{ "hmac-ripemd160@openssh.com", SSH_DIGEST, SSH_DIGEST_RIPEMD160, 0, 0, 0, 0 },
|
|
{ "umac-64@openssh.com", SSH_UMAC, 0, 0, 128, 64, 0 },
|
|
{ "umac-128@openssh.com", SSH_UMAC128, 0, 0, 128, 128, 0 },
|
|
|
|
/* Encrypt-then-MAC variants */
|
|
{ "hmac-sha1-etm@openssh.com", SSH_DIGEST, SSH_DIGEST_SHA1, 0, 0, 0, 1 },
|
|
{ "hmac-sha1-96-etm@openssh.com", SSH_DIGEST, SSH_DIGEST_SHA1, 96, 0, 0, 1 },
|
|
#ifdef HAVE_EVP_SHA256
|
|
{ "hmac-sha2-256-etm@openssh.com", SSH_DIGEST, SSH_DIGEST_SHA256, 0, 0, 0, 1 },
|
|
{ "hmac-sha2-512-etm@openssh.com", SSH_DIGEST, SSH_DIGEST_SHA512, 0, 0, 0, 1 },
|
|
#endif
|
|
{ "hmac-md5-etm@openssh.com", SSH_DIGEST, SSH_DIGEST_MD5, 0, 0, 0, 1 },
|
|
{ "hmac-md5-96-etm@openssh.com", SSH_DIGEST, SSH_DIGEST_MD5, 96, 0, 0, 1 },
|
|
{ "hmac-ripemd160-etm@openssh.com", SSH_DIGEST, SSH_DIGEST_RIPEMD160, 0, 0, 0, 1 },
|
|
{ "umac-64-etm@openssh.com", SSH_UMAC, 0, 0, 128, 64, 1 },
|
|
{ "umac-128-etm@openssh.com", SSH_UMAC128, 0, 0, 128, 128, 1 },
|
|
|
|
{ NULL, 0, 0, 0, 0, 0, 0 }
|
|
};
|
|
|
|
/* Returns a list of supported MACs separated by the specified char. */
|
|
char *
|
|
mac_alg_list(char sep)
|
|
{
|
|
char *ret = NULL;
|
|
size_t nlen, rlen = 0;
|
|
const struct macalg *m;
|
|
|
|
for (m = macs; m->name != NULL; m++) {
|
|
if (ret != NULL)
|
|
ret[rlen++] = sep;
|
|
nlen = strlen(m->name);
|
|
ret = xrealloc(ret, 1, rlen + nlen + 2);
|
|
memcpy(ret + rlen, m->name, nlen + 1);
|
|
rlen += nlen;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static void
|
|
mac_setup_by_alg(Mac *mac, const struct macalg *macalg)
|
|
{
|
|
mac->type = macalg->type;
|
|
if (mac->type == SSH_DIGEST) {
|
|
if ((mac->hmac_ctx = ssh_hmac_start(macalg->alg)) == NULL)
|
|
fatal("ssh_hmac_start(alg=%d) failed", macalg->alg);
|
|
mac->key_len = mac->mac_len = ssh_hmac_bytes(macalg->alg);
|
|
} else {
|
|
mac->mac_len = macalg->len / 8;
|
|
mac->key_len = macalg->key_len / 8;
|
|
mac->umac_ctx = NULL;
|
|
}
|
|
if (macalg->truncatebits != 0)
|
|
mac->mac_len = macalg->truncatebits / 8;
|
|
mac->etm = macalg->etm;
|
|
}
|
|
|
|
int
|
|
mac_setup(Mac *mac, char *name)
|
|
{
|
|
const struct macalg *m;
|
|
|
|
for (m = macs; m->name != NULL; m++) {
|
|
if (strcmp(name, m->name) != 0)
|
|
continue;
|
|
if (mac != NULL) {
|
|
mac_setup_by_alg(mac, m);
|
|
debug2("mac_setup: setup %s", name);
|
|
}
|
|
return (0);
|
|
}
|
|
debug2("mac_setup: unknown %s", name);
|
|
return (-1);
|
|
}
|
|
|
|
int
|
|
mac_init(Mac *mac)
|
|
{
|
|
if (mac->key == NULL)
|
|
fatal("%s: no key", __func__);
|
|
switch (mac->type) {
|
|
case SSH_DIGEST:
|
|
if (mac->hmac_ctx == NULL ||
|
|
ssh_hmac_init(mac->hmac_ctx, mac->key, mac->key_len) < 0)
|
|
return -1;
|
|
return 0;
|
|
case SSH_UMAC:
|
|
mac->umac_ctx = umac_new(mac->key);
|
|
return 0;
|
|
case SSH_UMAC128:
|
|
mac->umac_ctx = umac128_new(mac->key);
|
|
return 0;
|
|
default:
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
u_char *
|
|
mac_compute(Mac *mac, u_int32_t seqno, u_char *data, int datalen)
|
|
{
|
|
static union {
|
|
u_char m[EVP_MAX_MD_SIZE];
|
|
u_int64_t for_align;
|
|
} u;
|
|
u_char b[4], nonce[8];
|
|
|
|
if (mac->mac_len > sizeof(u))
|
|
fatal("mac_compute: mac too long %u %zu",
|
|
mac->mac_len, sizeof(u));
|
|
|
|
switch (mac->type) {
|
|
case SSH_DIGEST:
|
|
put_u32(b, seqno);
|
|
/* reset HMAC context */
|
|
if (ssh_hmac_init(mac->hmac_ctx, NULL, 0) < 0 ||
|
|
ssh_hmac_update(mac->hmac_ctx, b, sizeof(b)) < 0 ||
|
|
ssh_hmac_update(mac->hmac_ctx, data, datalen) < 0 ||
|
|
ssh_hmac_final(mac->hmac_ctx, u.m, sizeof(u.m)) < 0)
|
|
fatal("ssh_hmac failed");
|
|
break;
|
|
case SSH_UMAC:
|
|
put_u64(nonce, seqno);
|
|
umac_update(mac->umac_ctx, data, datalen);
|
|
umac_final(mac->umac_ctx, u.m, nonce);
|
|
break;
|
|
case SSH_UMAC128:
|
|
put_u64(nonce, seqno);
|
|
umac128_update(mac->umac_ctx, data, datalen);
|
|
umac128_final(mac->umac_ctx, u.m, nonce);
|
|
break;
|
|
default:
|
|
fatal("mac_compute: unknown MAC type");
|
|
}
|
|
return (u.m);
|
|
}
|
|
|
|
void
|
|
mac_clear(Mac *mac)
|
|
{
|
|
if (mac->type == SSH_UMAC) {
|
|
if (mac->umac_ctx != NULL)
|
|
umac_delete(mac->umac_ctx);
|
|
} else if (mac->type == SSH_UMAC128) {
|
|
if (mac->umac_ctx != NULL)
|
|
umac128_delete(mac->umac_ctx);
|
|
} else if (mac->hmac_ctx != NULL)
|
|
ssh_hmac_free(mac->hmac_ctx);
|
|
mac->hmac_ctx = NULL;
|
|
mac->umac_ctx = NULL;
|
|
}
|
|
|
|
/* 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_setup(NULL, p) < 0) {
|
|
debug("bad mac %s [%s]", p, names);
|
|
free(maclist);
|
|
return (0);
|
|
}
|
|
}
|
|
debug3("macs ok: [%s]", names);
|
|
free(maclist);
|
|
return (1);
|
|
}
|