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Annotation of src/usr.bin/ssh/kexdh.c, Revision 1.25

1.25    ! markus      1: /* $OpenBSD: kexdh.c,v 1.24 2014/01/09 23:20:00 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(
1.25    ! markus     42:     const char *client_version_string,
        !            43:     const char *server_version_string,
        !            44:     const u_char *ckexinit, size_t ckexinitlen,
        !            45:     const u_char *skexinit, size_t skexinitlen,
        !            46:     const u_char *serverhostkeyblob, size_t sbloblen,
        !            47:     const BIGNUM *client_dh_pub,
        !            48:     const BIGNUM *server_dh_pub,
        !            49:     const BIGNUM *shared_secret,
        !            50:     u_char *hash, size_t *hashlen)
1.1       markus     51: {
1.25    ! markus     52:        struct sshbuf *b;
        !            53:        int r;
1.1       markus     54:
1.25    ! markus     55:        if (*hashlen < ssh_digest_bytes(SSH_DIGEST_SHA1))
        !            56:                return SSH_ERR_INVALID_ARGUMENT;
        !            57:        if ((b = sshbuf_new()) == NULL)
        !            58:                return SSH_ERR_ALLOC_FAIL;
        !            59:        if ((r = sshbuf_put_cstring(b, client_version_string)) != 0 ||
        !            60:            (r = sshbuf_put_cstring(b, server_version_string)) != 0 ||
        !            61:            /* kexinit messages: fake header: len+SSH2_MSG_KEXINIT */
        !            62:            (r = sshbuf_put_u32(b, ckexinitlen+1)) != 0 ||
        !            63:            (r = sshbuf_put_u8(b, SSH2_MSG_KEXINIT)) != 0 ||
        !            64:            (r = sshbuf_put(b, ckexinit, ckexinitlen)) != 0 ||
        !            65:            (r = sshbuf_put_u32(b, skexinitlen+1)) != 0 ||
        !            66:            (r = sshbuf_put_u8(b, SSH2_MSG_KEXINIT)) != 0 ||
        !            67:            (r = sshbuf_put(b, skexinit, skexinitlen)) != 0 ||
        !            68:            (r = sshbuf_put_string(b, serverhostkeyblob, sbloblen)) != 0 ||
        !            69:            (r = sshbuf_put_bignum2(b, client_dh_pub)) != 0 ||
        !            70:            (r = sshbuf_put_bignum2(b, server_dh_pub)) != 0 ||
        !            71:            (r = sshbuf_put_bignum2(b, shared_secret)) != 0) {
        !            72:                sshbuf_free(b);
        !            73:                return r;
        !            74:        }
1.1       markus     75: #ifdef DEBUG_KEX
1.25    ! markus     76:        sshbuf_dump(b, stderr);
1.1       markus     77: #endif
1.25    ! markus     78:        if (ssh_digest_buffer(SSH_DIGEST_SHA1, b, hash, *hashlen) != 0) {
        !            79:                sshbuf_free(b);
        !            80:                return SSH_ERR_LIBCRYPTO_ERROR;
        !            81:        }
        !            82:        sshbuf_free(b);
        !            83:        *hashlen = ssh_digest_bytes(SSH_DIGEST_SHA1);
1.1       markus     84: #ifdef DEBUG_KEX
1.25    ! markus     85:        dump_digest("hash", hash, *hashlen);
1.1       markus     86: #endif
1.25    ! markus     87:        return 0;
1.1       markus     88: }