diff options
Diffstat (limited to 'crypto/openssh/kexdhs.c')
-rw-r--r-- | crypto/openssh/kexdhs.c | 159 |
1 files changed, 0 insertions, 159 deletions
diff --git a/crypto/openssh/kexdhs.c b/crypto/openssh/kexdhs.c deleted file mode 100644 index 8617088..0000000 --- a/crypto/openssh/kexdhs.c +++ /dev/null @@ -1,159 +0,0 @@ -/* $OpenBSD: kexdhs.c,v 1.9 2006/11/06 21:25:28 markus 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 "buffer.h" -#include "key.h" -#include "cipher.h" -#include "kex.h" -#include "log.h" -#include "packet.h" -#include "dh.h" -#include "ssh2.h" -#ifdef GSSAPI -#include "ssh-gss.h" -#endif -#include "monitor_wrap.h" - -void -kexdh_server(Kex *kex) -{ - BIGNUM *shared_secret = NULL, *dh_client_pub = NULL; - DH *dh; - Key *server_host_key; - u_char *kbuf, *hash, *signature = NULL, *server_host_key_blob = NULL; - u_int sbloblen, klen, hashlen, slen; - int kout; - - /* generate server DH public key */ - switch (kex->kex_type) { - case KEX_DH_GRP1_SHA1: - dh = dh_new_group1(); - break; - case KEX_DH_GRP14_SHA1: - dh = dh_new_group14(); - break; - default: - fatal("%s: Unexpected KEX type %d", __func__, kex->kex_type); - } - dh_gen_key(dh, kex->we_need * 8); - - debug("expecting SSH2_MSG_KEXDH_INIT"); - packet_read_expect(SSH2_MSG_KEXDH_INIT); - - if (kex->load_host_key == NULL) - fatal("Cannot load hostkey"); - server_host_key = kex->load_host_key(kex->hostkey_type); - if (server_host_key == NULL) - fatal("Unsupported hostkey type %d", kex->hostkey_type); - - /* key, cert */ - if ((dh_client_pub = BN_new()) == NULL) - fatal("dh_client_pub == NULL"); - packet_get_bignum2(dh_client_pub); - packet_check_eom(); - -#ifdef DEBUG_KEXDH - fprintf(stderr, "dh_client_pub= "); - BN_print_fp(stderr, dh_client_pub); - fprintf(stderr, "\n"); - debug("bits %d", BN_num_bits(dh_client_pub)); -#endif - -#ifdef DEBUG_KEXDH - DHparams_print_fp(stderr, dh); - fprintf(stderr, "pub= "); - BN_print_fp(stderr, dh->pub_key); - fprintf(stderr, "\n"); -#endif - if (!dh_pub_is_valid(dh, dh_client_pub)) - packet_disconnect("bad client public DH value"); - - klen = DH_size(dh); - kbuf = xmalloc(klen); - if ((kout = DH_compute_key(kbuf, dh_client_pub, dh)) < 0) - fatal("DH_compute_key: failed"); -#ifdef DEBUG_KEXDH - dump_digest("shared secret", kbuf, kout); -#endif - if ((shared_secret = BN_new()) == NULL) - fatal("kexdh_server: BN_new failed"); - if (BN_bin2bn(kbuf, kout, shared_secret) == NULL) - fatal("kexdh_server: BN_bin2bn failed"); - memset(kbuf, 0, klen); - xfree(kbuf); - - key_to_blob(server_host_key, &server_host_key_blob, &sbloblen); - - /* calc H */ - kex_dh_hash( - kex->client_version_string, - kex->server_version_string, - buffer_ptr(&kex->peer), buffer_len(&kex->peer), - buffer_ptr(&kex->my), buffer_len(&kex->my), - server_host_key_blob, sbloblen, - dh_client_pub, - dh->pub_key, - shared_secret, - &hash, &hashlen - ); - BN_clear_free(dh_client_pub); - - /* save session id := H */ - if (kex->session_id == NULL) { - kex->session_id_len = hashlen; - kex->session_id = xmalloc(kex->session_id_len); - memcpy(kex->session_id, hash, kex->session_id_len); - } - - /* sign H */ - PRIVSEP(key_sign(server_host_key, &signature, &slen, hash, hashlen)); - - /* destroy_sensitive_data(); */ - - /* send server hostkey, DH pubkey 'f' and singed H */ - packet_start(SSH2_MSG_KEXDH_REPLY); - packet_put_string(server_host_key_blob, sbloblen); - packet_put_bignum2(dh->pub_key); /* f */ - packet_put_string(signature, slen); - packet_send(); - - xfree(signature); - xfree(server_host_key_blob); - /* have keys, free DH */ - DH_free(dh); - - kex_derive_keys(kex, hash, hashlen, shared_secret); - BN_clear_free(shared_secret); - kex_finish(kex); -} |