mirror of
git://anongit.mindrot.org/openssh.git
synced 2024-12-16 07:04:34 +00:00
b3051d01e5
[digest.c digest.h hostfile.c kex.c kex.h kexc25519.c kexc25519c.c] [kexc25519s.c kexdh.c kexecdh.c kexecdhc.c kexecdhs.c kexgex.c kexgexc.c] [kexgexs.c key.c key.h roaming_client.c roaming_common.c schnorr.c] [schnorr.h ssh-dss.c ssh-ecdsa.c ssh-rsa.c sshconnect2.c] Introduce digest API and use it to perform all hashing operations rather than calling OpenSSL EVP_Digest* directly. Will make it easier to build a reduced-feature OpenSSH without OpenSSL in future; feedback, ok markus@
182 lines
4.9 KiB
C
182 lines
4.9 KiB
C
/* $OpenBSD: ssh-ecdsa.c,v 1.8 2014/01/09 23:20:00 djm Exp $ */
|
|
/*
|
|
* Copyright (c) 2000 Markus Friedl. All rights reserved.
|
|
* Copyright (c) 2010 Damien Miller. 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"
|
|
|
|
#ifdef OPENSSL_HAS_ECC
|
|
|
|
#include <sys/types.h>
|
|
|
|
#include <openssl/bn.h>
|
|
#include <openssl/ec.h>
|
|
#include <openssl/ecdsa.h>
|
|
#include <openssl/evp.h>
|
|
|
|
#include <string.h>
|
|
|
|
#include "xmalloc.h"
|
|
#include "buffer.h"
|
|
#include "compat.h"
|
|
#include "log.h"
|
|
#include "key.h"
|
|
#include "digest.h"
|
|
|
|
int
|
|
ssh_ecdsa_sign(const Key *key, u_char **sigp, u_int *lenp,
|
|
const u_char *data, u_int datalen)
|
|
{
|
|
ECDSA_SIG *sig;
|
|
int hash_alg;
|
|
u_char digest[SSH_DIGEST_MAX_LENGTH];
|
|
u_int len, dlen;
|
|
Buffer b, bb;
|
|
|
|
if (key == NULL || key_type_plain(key->type) != KEY_ECDSA ||
|
|
key->ecdsa == NULL) {
|
|
error("%s: no ECDSA key", __func__);
|
|
return -1;
|
|
}
|
|
|
|
hash_alg = key_ec_nid_to_hash_alg(key->ecdsa_nid);
|
|
if ((dlen = ssh_digest_bytes(hash_alg)) == 0) {
|
|
error("%s: bad hash algorithm %d", __func__, hash_alg);
|
|
return -1;
|
|
}
|
|
if (ssh_digest_memory(hash_alg, data, datalen,
|
|
digest, sizeof(digest)) != 0) {
|
|
error("%s: digest_memory failed", __func__);
|
|
return -1;
|
|
}
|
|
|
|
sig = ECDSA_do_sign(digest, dlen, key->ecdsa);
|
|
memset(digest, 'd', sizeof(digest));
|
|
|
|
if (sig == NULL) {
|
|
error("%s: sign failed", __func__);
|
|
return -1;
|
|
}
|
|
|
|
buffer_init(&bb);
|
|
buffer_put_bignum2(&bb, sig->r);
|
|
buffer_put_bignum2(&bb, sig->s);
|
|
ECDSA_SIG_free(sig);
|
|
|
|
buffer_init(&b);
|
|
buffer_put_cstring(&b, key_ssh_name_plain(key));
|
|
buffer_put_string(&b, buffer_ptr(&bb), buffer_len(&bb));
|
|
buffer_free(&bb);
|
|
len = buffer_len(&b);
|
|
if (lenp != NULL)
|
|
*lenp = len;
|
|
if (sigp != NULL) {
|
|
*sigp = xmalloc(len);
|
|
memcpy(*sigp, buffer_ptr(&b), len);
|
|
}
|
|
buffer_free(&b);
|
|
|
|
return 0;
|
|
}
|
|
int
|
|
ssh_ecdsa_verify(const Key *key, const u_char *signature, u_int signaturelen,
|
|
const u_char *data, u_int datalen)
|
|
{
|
|
ECDSA_SIG *sig;
|
|
int hash_alg;
|
|
u_char digest[SSH_DIGEST_MAX_LENGTH], *sigblob;
|
|
u_int len, dlen;
|
|
int rlen, ret;
|
|
Buffer b, bb;
|
|
char *ktype;
|
|
|
|
if (key == NULL || key_type_plain(key->type) != KEY_ECDSA ||
|
|
key->ecdsa == NULL) {
|
|
error("%s: no ECDSA key", __func__);
|
|
return -1;
|
|
}
|
|
|
|
/* fetch signature */
|
|
buffer_init(&b);
|
|
buffer_append(&b, signature, signaturelen);
|
|
ktype = buffer_get_string(&b, NULL);
|
|
if (strcmp(key_ssh_name_plain(key), ktype) != 0) {
|
|
error("%s: cannot handle type %s", __func__, ktype);
|
|
buffer_free(&b);
|
|
free(ktype);
|
|
return -1;
|
|
}
|
|
free(ktype);
|
|
sigblob = buffer_get_string(&b, &len);
|
|
rlen = buffer_len(&b);
|
|
buffer_free(&b);
|
|
if (rlen != 0) {
|
|
error("%s: remaining bytes in signature %d", __func__, rlen);
|
|
free(sigblob);
|
|
return -1;
|
|
}
|
|
|
|
/* parse signature */
|
|
if ((sig = ECDSA_SIG_new()) == NULL)
|
|
fatal("%s: ECDSA_SIG_new failed", __func__);
|
|
if ((sig->r = BN_new()) == NULL ||
|
|
(sig->s = BN_new()) == NULL)
|
|
fatal("%s: BN_new failed", __func__);
|
|
|
|
buffer_init(&bb);
|
|
buffer_append(&bb, sigblob, len);
|
|
buffer_get_bignum2(&bb, sig->r);
|
|
buffer_get_bignum2(&bb, sig->s);
|
|
if (buffer_len(&bb) != 0)
|
|
fatal("%s: remaining bytes in inner sigblob", __func__);
|
|
buffer_free(&bb);
|
|
|
|
/* clean up */
|
|
memset(sigblob, 0, len);
|
|
free(sigblob);
|
|
|
|
/* hash the data */
|
|
hash_alg = key_ec_nid_to_hash_alg(key->ecdsa_nid);
|
|
if ((dlen = ssh_digest_bytes(hash_alg)) == 0) {
|
|
error("%s: bad hash algorithm %d", __func__, hash_alg);
|
|
return -1;
|
|
}
|
|
if (ssh_digest_memory(hash_alg, data, datalen,
|
|
digest, sizeof(digest)) != 0) {
|
|
error("%s: digest_memory failed", __func__);
|
|
return -1;
|
|
}
|
|
|
|
ret = ECDSA_do_verify(digest, dlen, sig, key->ecdsa);
|
|
memset(digest, 'd', sizeof(digest));
|
|
|
|
ECDSA_SIG_free(sig);
|
|
|
|
debug("%s: signature %s", __func__,
|
|
ret == 1 ? "correct" : ret == 0 ? "incorrect" : "error");
|
|
return ret;
|
|
}
|
|
|
|
#endif /* OPENSSL_HAS_ECC */
|