markus@openbsd.org | 57d10cb | 2015-01-19 20:16:15 +0000 | [diff] [blame] | 1 | /* $OpenBSD: kexgex.c,v 1.29 2015/01/19 20:16:15 markus Exp $ */ |
Ben Lindstrom | 22b19b4 | 2001-04-04 17:39:19 +0000 | [diff] [blame] | 2 | /* |
| 3 | * Copyright (c) 2000 Niels Provos. All rights reserved. |
| 4 | * Copyright (c) 2001 Markus Friedl. All rights reserved. |
| 5 | * |
| 6 | * Redistribution and use in source and binary forms, with or without |
| 7 | * modification, are permitted provided that the following conditions |
| 8 | * are met: |
| 9 | * 1. Redistributions of source code must retain the above copyright |
| 10 | * notice, this list of conditions and the following disclaimer. |
| 11 | * 2. Redistributions in binary form must reproduce the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer in the |
| 13 | * documentation and/or other materials provided with the distribution. |
| 14 | * |
| 15 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 16 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 17 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 18 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 19 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 20 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 21 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 22 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 23 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 24 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 25 | */ |
| 26 | |
| 27 | #include "includes.h" |
Ben Lindstrom | 22b19b4 | 2001-04-04 17:39:19 +0000 | [diff] [blame] | 28 | |
Damien Miller | 72ef7c1 | 2015-01-15 02:21:31 +1100 | [diff] [blame] | 29 | #ifdef WITH_OPENSSL |
| 30 | |
Damien Miller | d783435 | 2006-08-05 12:39:39 +1000 | [diff] [blame] | 31 | #include <sys/types.h> |
| 32 | |
Damien Miller | 8e7fb33 | 2003-02-24 12:03:03 +1100 | [diff] [blame] | 33 | #include <openssl/evp.h> |
Damien Miller | d783435 | 2006-08-05 12:39:39 +1000 | [diff] [blame] | 34 | #include <signal.h> |
Ben Lindstrom | 22b19b4 | 2001-04-04 17:39:19 +0000 | [diff] [blame] | 35 | |
Damien Miller | 48f54b9 | 2018-09-13 12:13:50 +1000 | [diff] [blame^] | 36 | #include "openbsd-compat/openssl-compat.h" |
| 37 | |
markus@openbsd.org | 57d10cb | 2015-01-19 20:16:15 +0000 | [diff] [blame] | 38 | #include "sshkey.h" |
Damien Miller | d783435 | 2006-08-05 12:39:39 +1000 | [diff] [blame] | 39 | #include "cipher.h" |
Ben Lindstrom | 22b19b4 | 2001-04-04 17:39:19 +0000 | [diff] [blame] | 40 | #include "kex.h" |
Ben Lindstrom | 22b19b4 | 2001-04-04 17:39:19 +0000 | [diff] [blame] | 41 | #include "ssh2.h" |
markus@openbsd.org | 57d10cb | 2015-01-19 20:16:15 +0000 | [diff] [blame] | 42 | #include "ssherr.h" |
| 43 | #include "sshbuf.h" |
Damien Miller | b3051d0 | 2014-01-10 10:58:53 +1100 | [diff] [blame] | 44 | #include "digest.h" |
Ben Lindstrom | 22b19b4 | 2001-04-04 17:39:19 +0000 | [diff] [blame] | 45 | |
markus@openbsd.org | 57d10cb | 2015-01-19 20:16:15 +0000 | [diff] [blame] | 46 | int |
Ben Lindstrom | 22b19b4 | 2001-04-04 17:39:19 +0000 | [diff] [blame] | 47 | kexgex_hash( |
Damien Miller | b3051d0 | 2014-01-10 10:58:53 +1100 | [diff] [blame] | 48 | int hash_alg, |
markus@openbsd.org | 57d10cb | 2015-01-19 20:16:15 +0000 | [diff] [blame] | 49 | const char *client_version_string, |
| 50 | const char *server_version_string, |
| 51 | const u_char *ckexinit, size_t ckexinitlen, |
| 52 | const u_char *skexinit, size_t skexinitlen, |
| 53 | const u_char *serverhostkeyblob, size_t sbloblen, |
| 54 | int min, int wantbits, int max, |
| 55 | const BIGNUM *prime, |
| 56 | const BIGNUM *gen, |
| 57 | const BIGNUM *client_dh_pub, |
| 58 | const BIGNUM *server_dh_pub, |
| 59 | const BIGNUM *shared_secret, |
| 60 | u_char *hash, size_t *hashlen) |
Ben Lindstrom | 22b19b4 | 2001-04-04 17:39:19 +0000 | [diff] [blame] | 61 | { |
markus@openbsd.org | 57d10cb | 2015-01-19 20:16:15 +0000 | [diff] [blame] | 62 | struct sshbuf *b; |
| 63 | int r; |
Ben Lindstrom | 22b19b4 | 2001-04-04 17:39:19 +0000 | [diff] [blame] | 64 | |
markus@openbsd.org | 57d10cb | 2015-01-19 20:16:15 +0000 | [diff] [blame] | 65 | if (*hashlen < ssh_digest_bytes(SSH_DIGEST_SHA1)) |
| 66 | return SSH_ERR_INVALID_ARGUMENT; |
| 67 | if ((b = sshbuf_new()) == NULL) |
| 68 | return SSH_ERR_ALLOC_FAIL; |
| 69 | if ((r = sshbuf_put_cstring(b, client_version_string)) != 0 || |
| 70 | (r = sshbuf_put_cstring(b, server_version_string)) != 0 || |
| 71 | /* kexinit messages: fake header: len+SSH2_MSG_KEXINIT */ |
| 72 | (r = sshbuf_put_u32(b, ckexinitlen+1)) != 0 || |
| 73 | (r = sshbuf_put_u8(b, SSH2_MSG_KEXINIT)) != 0 || |
| 74 | (r = sshbuf_put(b, ckexinit, ckexinitlen)) != 0 || |
| 75 | (r = sshbuf_put_u32(b, skexinitlen+1)) != 0 || |
| 76 | (r = sshbuf_put_u8(b, SSH2_MSG_KEXINIT)) != 0 || |
| 77 | (r = sshbuf_put(b, skexinit, skexinitlen)) != 0 || |
| 78 | (r = sshbuf_put_string(b, serverhostkeyblob, sbloblen)) != 0 || |
| 79 | (min != -1 && (r = sshbuf_put_u32(b, min)) != 0) || |
| 80 | (r = sshbuf_put_u32(b, wantbits)) != 0 || |
| 81 | (max != -1 && (r = sshbuf_put_u32(b, max)) != 0) || |
| 82 | (r = sshbuf_put_bignum2(b, prime)) != 0 || |
| 83 | (r = sshbuf_put_bignum2(b, gen)) != 0 || |
| 84 | (r = sshbuf_put_bignum2(b, client_dh_pub)) != 0 || |
| 85 | (r = sshbuf_put_bignum2(b, server_dh_pub)) != 0 || |
| 86 | (r = sshbuf_put_bignum2(b, shared_secret)) != 0) { |
| 87 | sshbuf_free(b); |
| 88 | return r; |
Ben Lindstrom | 22b19b4 | 2001-04-04 17:39:19 +0000 | [diff] [blame] | 89 | } |
Ben Lindstrom | 22b19b4 | 2001-04-04 17:39:19 +0000 | [diff] [blame] | 90 | #ifdef DEBUG_KEXDH |
markus@openbsd.org | 57d10cb | 2015-01-19 20:16:15 +0000 | [diff] [blame] | 91 | sshbuf_dump(b, stderr); |
Ben Lindstrom | 22b19b4 | 2001-04-04 17:39:19 +0000 | [diff] [blame] | 92 | #endif |
markus@openbsd.org | 57d10cb | 2015-01-19 20:16:15 +0000 | [diff] [blame] | 93 | if (ssh_digest_buffer(hash_alg, b, hash, *hashlen) != 0) { |
| 94 | sshbuf_free(b); |
| 95 | return SSH_ERR_LIBCRYPTO_ERROR; |
| 96 | } |
| 97 | sshbuf_free(b); |
Damien Miller | b3051d0 | 2014-01-10 10:58:53 +1100 | [diff] [blame] | 98 | *hashlen = ssh_digest_bytes(hash_alg); |
markus@openbsd.org | 57d10cb | 2015-01-19 20:16:15 +0000 | [diff] [blame] | 99 | #ifdef DEBUG_KEXDH |
| 100 | dump_digest("hash", hash, *hashlen); |
| 101 | #endif |
| 102 | return 0; |
Ben Lindstrom | 22b19b4 | 2001-04-04 17:39:19 +0000 | [diff] [blame] | 103 | } |
Damien Miller | 72ef7c1 | 2015-01-15 02:21:31 +1100 | [diff] [blame] | 104 | #endif /* WITH_OPENSSL */ |