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Annotation of src/usr.bin/ssh/kexdh.c, Revision 1.27

1.27    ! djm         1: /* $OpenBSD: kexdh.c,v 1.26 2016/05/02 10:26:04 djm Exp $ */
1.1       markus      2: /*
                      3:  * Copyright (c) 2001 Markus Friedl.  All rights reserved.
                      4:  *
                      5:  * Redistribution and use in source and binary forms, with or without
                      6:  * modification, are permitted provided that the following conditions
                      7:  * are met:
                      8:  * 1. Redistributions of source code must retain the above copyright
                      9:  *    notice, this list of conditions and the following disclaimer.
                     10:  * 2. Redistributions in binary form must reproduce the above copyright
                     11:  *    notice, this list of conditions and the following disclaimer in the
                     12:  *    documentation and/or other materials provided with the distribution.
                     13:  *
                     14:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
                     15:  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
                     16:  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
                     17:  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
                     18:  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
                     19:  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
                     20:  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
                     21:  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
                     22:  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
                     23:  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
                     24:  */
                     25:
1.23      deraadt    26: #include <sys/types.h>
                     27:
                     28: #include <signal.h>
1.1       markus     29:
1.19      markus     30: #include <openssl/evp.h>
1.1       markus     31:
1.19      markus     32: #include "ssh2.h"
1.25      markus     33: #include "sshkey.h"
1.23      deraadt    34: #include "cipher.h"
1.1       markus     35: #include "kex.h"
1.25      markus     36: #include "ssherr.h"
                     37: #include "sshbuf.h"
1.24      djm        38: #include "digest.h"
1.1       markus     39:
1.25      markus     40: int
1.1       markus     41: kex_dh_hash(
1.26      djm        42:     int hash_alg,
1.27    ! djm        43:     const struct sshbuf *client_version,
        !            44:     const struct sshbuf *server_version,
1.25      markus     45:     const u_char *ckexinit, size_t ckexinitlen,
                     46:     const u_char *skexinit, size_t skexinitlen,
                     47:     const u_char *serverhostkeyblob, size_t sbloblen,
                     48:     const BIGNUM *client_dh_pub,
                     49:     const BIGNUM *server_dh_pub,
                     50:     const BIGNUM *shared_secret,
                     51:     u_char *hash, size_t *hashlen)
1.1       markus     52: {
1.25      markus     53:        struct sshbuf *b;
                     54:        int r;
1.1       markus     55:
1.26      djm        56:        if (*hashlen < ssh_digest_bytes(hash_alg))
1.25      markus     57:                return SSH_ERR_INVALID_ARGUMENT;
                     58:        if ((b = sshbuf_new()) == NULL)
                     59:                return SSH_ERR_ALLOC_FAIL;
1.27    ! djm        60:        if ((r = sshbuf_put_stringb(b, client_version)) < 0 ||
        !            61:            (r = sshbuf_put_stringb(b, server_version)) < 0 ||
1.25      markus     62:            /* kexinit messages: fake header: len+SSH2_MSG_KEXINIT */
                     63:            (r = sshbuf_put_u32(b, ckexinitlen+1)) != 0 ||
                     64:            (r = sshbuf_put_u8(b, SSH2_MSG_KEXINIT)) != 0 ||
                     65:            (r = sshbuf_put(b, ckexinit, ckexinitlen)) != 0 ||
                     66:            (r = sshbuf_put_u32(b, skexinitlen+1)) != 0 ||
                     67:            (r = sshbuf_put_u8(b, SSH2_MSG_KEXINIT)) != 0 ||
                     68:            (r = sshbuf_put(b, skexinit, skexinitlen)) != 0 ||
                     69:            (r = sshbuf_put_string(b, serverhostkeyblob, sbloblen)) != 0 ||
                     70:            (r = sshbuf_put_bignum2(b, client_dh_pub)) != 0 ||
                     71:            (r = sshbuf_put_bignum2(b, server_dh_pub)) != 0 ||
                     72:            (r = sshbuf_put_bignum2(b, shared_secret)) != 0) {
                     73:                sshbuf_free(b);
                     74:                return r;
                     75:        }
1.1       markus     76: #ifdef DEBUG_KEX
1.25      markus     77:        sshbuf_dump(b, stderr);
1.1       markus     78: #endif
1.26      djm        79:        if (ssh_digest_buffer(hash_alg, b, hash, *hashlen) != 0) {
1.25      markus     80:                sshbuf_free(b);
                     81:                return SSH_ERR_LIBCRYPTO_ERROR;
                     82:        }
                     83:        sshbuf_free(b);
1.26      djm        84:        *hashlen = ssh_digest_bytes(hash_alg);
1.1       markus     85: #ifdef DEBUG_KEX
1.25      markus     86:        dump_digest("hash", hash, *hashlen);
1.1       markus     87: #endif
1.25      markus     88:        return 0;
1.1       markus     89: }