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Annotation of src/usr.bin/ssh/kexgex.c, Revision 1.32

1.32    ! djm         1: /* $OpenBSD: kexgex.c,v 1.31 2019/01/21 10:03:37 djm Exp $ */
1.1       markus      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:
1.27      deraadt    27: #include <sys/types.h>
1.1       markus     28:
1.23      markus     29: #include <openssl/evp.h>
1.27      deraadt    30: #include <signal.h>
1.1       markus     31:
1.29      markus     32: #include "sshkey.h"
1.27      deraadt    33: #include "cipher.h"
1.1       markus     34: #include "kex.h"
                     35: #include "ssh2.h"
1.29      markus     36: #include "ssherr.h"
                     37: #include "sshbuf.h"
1.28      djm        38: #include "digest.h"
1.1       markus     39:
1.29      markus     40: int
1.1       markus     41: kexgex_hash(
1.28      djm        42:     int hash_alg,
1.30      djm        43:     const struct sshbuf *client_version,
                     44:     const struct sshbuf *server_version,
1.32    ! djm        45:     const struct sshbuf *client_kexinit,
        !            46:     const struct sshbuf *server_kexinit,
        !            47:     const struct sshbuf *server_host_key_blob,
1.29      markus     48:     int min, int wantbits, int max,
                     49:     const BIGNUM *prime,
                     50:     const BIGNUM *gen,
                     51:     const BIGNUM *client_dh_pub,
                     52:     const BIGNUM *server_dh_pub,
1.31      djm        53:     const u_char *shared_secret, size_t secretlen,
1.29      markus     54:     u_char *hash, size_t *hashlen)
1.1       markus     55: {
1.29      markus     56:        struct sshbuf *b;
                     57:        int r;
1.1       markus     58:
1.29      markus     59:        if (*hashlen < ssh_digest_bytes(SSH_DIGEST_SHA1))
                     60:                return SSH_ERR_INVALID_ARGUMENT;
                     61:        if ((b = sshbuf_new()) == NULL)
                     62:                return SSH_ERR_ALLOC_FAIL;
1.30      djm        63:        if ((r = sshbuf_put_stringb(b, client_version)) < 0 ||
                     64:            (r = sshbuf_put_stringb(b, server_version)) < 0 ||
1.29      markus     65:            /* kexinit messages: fake header: len+SSH2_MSG_KEXINIT */
1.32    ! djm        66:            (r = sshbuf_put_u32(b, sshbuf_len(client_kexinit) + 1)) != 0 ||
1.29      markus     67:            (r = sshbuf_put_u8(b, SSH2_MSG_KEXINIT)) != 0 ||
1.32    ! djm        68:            (r = sshbuf_putb(b, client_kexinit)) != 0 ||
        !            69:            (r = sshbuf_put_u32(b, sshbuf_len(server_kexinit) + 1)) != 0 ||
1.29      markus     70:            (r = sshbuf_put_u8(b, SSH2_MSG_KEXINIT)) != 0 ||
1.32    ! djm        71:            (r = sshbuf_putb(b, server_kexinit)) != 0 ||
        !            72:            (r = sshbuf_put_stringb(b, server_host_key_blob)) != 0 ||
1.29      markus     73:            (min != -1 && (r = sshbuf_put_u32(b, min)) != 0) ||
                     74:            (r = sshbuf_put_u32(b, wantbits)) != 0 ||
                     75:            (max != -1 && (r = sshbuf_put_u32(b, max)) != 0) ||
                     76:            (r = sshbuf_put_bignum2(b, prime)) != 0 ||
                     77:            (r = sshbuf_put_bignum2(b, gen)) != 0 ||
                     78:            (r = sshbuf_put_bignum2(b, client_dh_pub)) != 0 ||
                     79:            (r = sshbuf_put_bignum2(b, server_dh_pub)) != 0 ||
1.31      djm        80:            (r = sshbuf_put(b, shared_secret, secretlen)) != 0) {
1.29      markus     81:                sshbuf_free(b);
                     82:                return r;
1.1       markus     83:        }
                     84: #ifdef DEBUG_KEXDH
1.29      markus     85:        sshbuf_dump(b, stderr);
1.1       markus     86: #endif
1.29      markus     87:        if (ssh_digest_buffer(hash_alg, b, hash, *hashlen) != 0) {
                     88:                sshbuf_free(b);
                     89:                return SSH_ERR_LIBCRYPTO_ERROR;
                     90:        }
                     91:        sshbuf_free(b);
                     92:        *hashlen = ssh_digest_bytes(hash_alg);
                     93: #ifdef DEBUG_KEXDH
                     94:        dump_digest("hash", hash, *hashlen);
1.28      djm        95: #endif
1.29      markus     96:        return 0;
1.1       markus     97: }