diff options
Diffstat (limited to 'kexecdhc.c')
| -rw-r--r-- | kexecdhc.c | 199 |
1 files changed, 0 insertions, 199 deletions
diff --git a/kexecdhc.c b/kexecdhc.c deleted file mode 100644 index bfb9f470..00000000 --- a/kexecdhc.c +++ /dev/null @@ -1,199 +0,0 @@ -/* $OpenBSD: kexecdhc.c,v 1.16 2019/01/21 10:07:22 djm Exp $ */ -/* - * Copyright (c) 2001 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" - -#if defined(WITH_OPENSSL) && defined(OPENSSL_HAS_ECC) - -#include <sys/types.h> - -#include <stdio.h> -#include <string.h> -#include <signal.h> - -#include <openssl/ecdh.h> - -#include "sshkey.h" -#include "cipher.h" -#include "digest.h" -#include "kex.h" -#include "log.h" -#include "packet.h" -#include "dh.h" -#include "ssh2.h" -#include "dispatch.h" -#include "compat.h" -#include "ssherr.h" -#include "sshbuf.h" - -static int input_kex_ecdh_reply(int, u_int32_t, struct ssh *); - -int -kexecdh_client(struct ssh *ssh) -{ - struct kex *kex = ssh->kex; - EC_KEY *client_key = NULL; - const EC_GROUP *group; - const EC_POINT *public_key; - int r; - - if ((client_key = EC_KEY_new_by_curve_name(kex->ec_nid)) == NULL) { - r = SSH_ERR_ALLOC_FAIL; - goto out; - } - if (EC_KEY_generate_key(client_key) != 1) { - r = SSH_ERR_LIBCRYPTO_ERROR; - goto out; - } - group = EC_KEY_get0_group(client_key); - public_key = EC_KEY_get0_public_key(client_key); - - if ((r = sshpkt_start(ssh, SSH2_MSG_KEX_ECDH_INIT)) != 0 || - (r = sshpkt_put_ec(ssh, public_key, group)) != 0 || - (r = sshpkt_send(ssh)) != 0) - goto out; - debug("sending SSH2_MSG_KEX_ECDH_INIT"); - -#ifdef DEBUG_KEXECDH - fputs("client private key:\n", stderr); - sshkey_dump_ec_key(client_key); -#endif - kex->ec_client_key = client_key; - kex->ec_group = group; - client_key = NULL; /* owned by the kex */ - - debug("expecting SSH2_MSG_KEX_ECDH_REPLY"); - ssh_dispatch_set(ssh, SSH2_MSG_KEX_ECDH_REPLY, &input_kex_ecdh_reply); - r = 0; - out: - EC_KEY_free(client_key); - return r; -} - -static int -input_kex_ecdh_reply(int type, u_int32_t seq, struct ssh *ssh) -{ - struct kex *kex = ssh->kex; - const EC_GROUP *group; - EC_POINT *server_public = NULL; - EC_KEY *client_key; - BIGNUM *shared_secret = NULL; - struct sshkey *server_host_key = NULL; - u_char *server_host_key_blob = NULL, *signature = NULL; - u_char *kbuf = NULL; - u_char hash[SSH_DIGEST_MAX_LENGTH]; - size_t slen, sbloblen; - size_t klen = 0, hashlen; - int r; - - group = kex->ec_group; - client_key = kex->ec_client_key; - - /* hostkey */ - if ((r = sshpkt_get_string(ssh, &server_host_key_blob, - &sbloblen)) != 0 || - (r = sshkey_from_blob(server_host_key_blob, sbloblen, - &server_host_key)) != 0) - goto out; - if ((r = kex_verify_host_key(ssh, server_host_key)) != 0) - goto out; - - /* Q_S, server public key */ - /* signed H */ - if ((server_public = EC_POINT_new(group)) == NULL) { - r = SSH_ERR_ALLOC_FAIL; - goto out; - } - if ((r = sshpkt_get_ec(ssh, server_public, group)) != 0 || - (r = sshpkt_get_string(ssh, &signature, &slen)) != 0 || - (r = sshpkt_get_end(ssh)) != 0) - goto out; - -#ifdef DEBUG_KEXECDH - fputs("server public key:\n", stderr); - sshkey_dump_ec_point(group, server_public); -#endif - if (sshkey_ec_validate_public(group, server_public) != 0) { - sshpkt_disconnect(ssh, "invalid server public key"); - r = SSH_ERR_MESSAGE_INCOMPLETE; - goto out; - } - - klen = (EC_GROUP_get_degree(group) + 7) / 8; - if ((kbuf = malloc(klen)) == NULL || - (shared_secret = BN_new()) == NULL) { - r = SSH_ERR_ALLOC_FAIL; - goto out; - } - if (ECDH_compute_key(kbuf, klen, server_public, - client_key, NULL) != (int)klen || - BN_bin2bn(kbuf, klen, shared_secret) == NULL) { - r = SSH_ERR_LIBCRYPTO_ERROR; - goto out; - } - -#ifdef DEBUG_KEXECDH - dump_digest("shared secret", kbuf, klen); -#endif - /* calc and verify H */ - hashlen = sizeof(hash); - if ((r = kex_ecdh_hash( - kex->hash_alg, - group, - kex->client_version, - kex->server_version, - sshbuf_ptr(kex->my), sshbuf_len(kex->my), - sshbuf_ptr(kex->peer), sshbuf_len(kex->peer), - server_host_key_blob, sbloblen, - EC_KEY_get0_public_key(client_key), - server_public, - shared_secret, - hash, &hashlen)) != 0) - goto out; - - if ((r = sshkey_verify(server_host_key, signature, slen, hash, - hashlen, kex->hostkey_alg, ssh->compat)) != 0) - goto out; - - if ((r = kex_derive_keys_bn(ssh, hash, hashlen, shared_secret)) == 0) - r = kex_send_newkeys(ssh); - out: - explicit_bzero(hash, sizeof(hash)); - EC_KEY_free(kex->ec_client_key); - kex->ec_client_key = NULL; - EC_POINT_clear_free(server_public); - if (kbuf) { - explicit_bzero(kbuf, klen); - free(kbuf); - } - BN_clear_free(shared_secret); - sshkey_free(server_host_key); - free(server_host_key_blob); - free(signature); - return r; -} -#endif /* defined(WITH_OPENSSL) && defined(OPENSSL_HAS_ECC) */ - |