Mercurial > dropbear

comparison cli-kex.c @ 26:0969767bca0d

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snapshot of stuff
author Matt Johnston <matt@ucc.asn.au>
date Mon, 26 Jul 2004 02:44:20 +0000
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children f789045062e6
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25:e4b6e2d569b2 26:0969767bca0d
1 /*
2 * Dropbear - a SSH2 server
3 *
4 * Copyright (c) 2002,2003 Matt Johnston
5 * All rights reserved.
6 *
7 * Permission is hereby granted, free of charge, to any person obtaining a copy
8 * of this software and associated documentation files (the "Software"), to deal
9 * in the Software without restriction, including without limitation the rights
10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
11 * copies of the Software, and to permit persons to whom the Software is
12 * furnished to do so, subject to the following conditions:
13 *
14 * The above copyright notice and this permission notice shall be included in
15 * all copies or substantial portions of the Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
20 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
23 * SOFTWARE. */
24
25 #include "includes.h"
26 #include "session.h"
27 #include "dbutil.h"
28 #include "algo.h"
29 #include "buffer.h"
30 #include "session.h"
31 #include "kex.h"
32 #include "ssh.h"
33 #include "packet.h"
34 #include "bignum.h"
35 #include "random.h"
36 #include "runopts.h"
37
38
39
40 void send_msg_kexdh_init() {
41
42 cli_ses.dh_e = (mp_int*)m_malloc(sizeof(mp_int));
43 cli_ses.dh_x = (mp_int*)m_malloc(sizeof(mp_int));
44
45 m_mp_init_multi(cli_ses.dh_e, cli_ses.dh_x);
46 gen_kexdh_vals(cli_ses.dh_e, cli_ses.dh_x);
47
48 CHECKCLEARTOWRITE();
49 buf_putbyte(ses.writepayload, SSH_MSG_KEXDH_INIT);
50 buf_putmpint(ses.writepayload, cli_ses.dh_e);
51 encrypt_packet();
52 ses.requirenext = SSH_MSG_KEXDH_REPLY;
53 }
54
55 /* Handle a diffie-hellman key exchange reply. */
56 void recv_msg_kexdh_reply() {
57
58 mp_int dh_f;
59 sign_key *hostkey = NULL;
60 int type;
61
62 type = ses.newkeys->algo_hostkey;
63
64 hostkey = new_sign_key();
65 if (buf_get_pub_key(ses.payload, hostkey, &type) != DROPBEAR_SUCCESS) {
66 dropbear_exit("Bad KEX packet");
67 }
68
69 m_mp_init(&dh_f);
70 if (buf_getmpint(ses.payload, &dh_f) != DROPBEAR_SUCCESS) {
71 dropbear_exit("Bad KEX packet");
72 }
73
74 kexdh_comb_key(cli_ses.dh_e, cli_ses.dh_x, &dh_f, hostkey);
75 mp_clear(&dh_f);
76
77 if (buf_verify(ses.payload, hostkey, ses.hash, SHA1_HASH_SIZE)
78 != DROPBEAR_SUCCESS) {
79 dropbear_exit("Bad hostkey signature");
80 }
81
82 /* XXX TODO */
83 dropbear_log(LOG_WARNING,"Not checking hostkey fingerprint for the moment");
84
85 sign_key_free(hostkey);
86 hostkey = NULL;
87
88 send_msg_newkeys();
89 ses.requirenext = SSH_MSG_NEWKEYS;
90 TRACE(("leave recv_msg_kexdh_init"));
91 }