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44d8ddddb1
Implementation of a generic wrap interface for bignum and diffie-hellman based upon Damien's wrap code in openssh-openbsd. This commit adds the generic interface along with the backing code for openssl, cng, and cng with an openssl fallback. Currently, openssl is the only provider for bignum and the diffie-hellman generic interface is only for static and negotiated oakley groups..
92 lines
3.2 KiB
C
92 lines
3.2 KiB
C
/* $OpenBSD: kexdh.c,v 1.25 2015/01/19 20:16:15 markus Exp $ */
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/*
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* Copyright (c) 2001 Markus Friedl. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "includes.h"
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#include <sys/types.h>
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#include <signal.h>
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#include <openssl/evp.h>
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#include "ssh2.h"
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#include "sshkey.h"
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#include "cipher.h"
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#include "kex.h"
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#include "ssherr.h"
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#include "sshbuf.h"
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#include "digest.h"
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int
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kex_dh_hash(
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const char *client_version_string,
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const char *server_version_string,
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const u_char *ckexinit, size_t ckexinitlen,
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const u_char *skexinit, size_t skexinitlen,
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const u_char *serverhostkeyblob, size_t sbloblen,
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const struct sshbn *client_dh_pub,
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const struct sshbn *server_dh_pub,
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const struct sshbn *shared_secret,
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u_char *hash, size_t *hashlen)
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{
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struct sshbuf *b;
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int r;
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if (*hashlen < ssh_digest_bytes(SSH_DIGEST_SHA1))
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return SSH_ERR_INVALID_ARGUMENT;
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if ((b = sshbuf_new()) == NULL)
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return SSH_ERR_ALLOC_FAIL;
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if ((r = sshbuf_put_cstring(b, client_version_string)) != 0 ||
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(r = sshbuf_put_cstring(b, server_version_string)) != 0 ||
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/* kexinit messages: fake header: len+SSH2_MSG_KEXINIT */
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(r = sshbuf_put_u32(b, ckexinitlen + 1)) != 0 ||
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(r = sshbuf_put_u8(b, SSH2_MSG_KEXINIT)) != 0 ||
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(r = sshbuf_put(b, ckexinit, ckexinitlen)) != 0 ||
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(r = sshbuf_put_u32(b, skexinitlen + 1)) != 0 ||
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(r = sshbuf_put_u8(b, SSH2_MSG_KEXINIT)) != 0 ||
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(r = sshbuf_put(b, skexinit, skexinitlen)) != 0 ||
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(r = sshbuf_put_string(b, serverhostkeyblob, sbloblen)) != 0 ||
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(r = sshbuf_put_bignum2_wrap(b, client_dh_pub)) != 0 ||
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(r = sshbuf_put_bignum2_wrap(b, server_dh_pub)) != 0 ||
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(r = sshbuf_put_bignum2_wrap(b, shared_secret)) != 0) {
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sshbuf_free(b);
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return r;
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}
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#ifdef DEBUG_KEX
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sshbuf_dump(b, stderr);
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#endif
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if (ssh_digest_buffer(SSH_DIGEST_SHA1, b, hash, *hashlen) != 0) {
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sshbuf_free(b);
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return SSH_ERR_LIBCRYPTO_ERROR;
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}
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sshbuf_free(b);
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*hashlen = ssh_digest_bytes(SSH_DIGEST_SHA1);
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#ifdef DEBUG_KEX
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dump_digest("hash", hash, *hashlen);
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#endif
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return 0;
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}
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