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3c0ef626 1/* $OpenBSD: kex.h,v 1.26 2001/06/26 17:27:23 markus Exp $ */
2
3/*
4 * Copyright (c) 2000, 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#ifndef KEX_H
27#define KEX_H
28
29#include <openssl/evp.h>
30#include "buffer.h"
31#include "cipher.h"
32#include "key.h"
33
34#define KEX_DH1 "diffie-hellman-group1-sha1"
35#define KEX_DHGEX "diffie-hellman-group-exchange-sha1"
36
37enum kex_init_proposals {
38 PROPOSAL_KEX_ALGS,
39 PROPOSAL_SERVER_HOST_KEY_ALGS,
40 PROPOSAL_ENC_ALGS_CTOS,
41 PROPOSAL_ENC_ALGS_STOC,
42 PROPOSAL_MAC_ALGS_CTOS,
43 PROPOSAL_MAC_ALGS_STOC,
44 PROPOSAL_COMP_ALGS_CTOS,
45 PROPOSAL_COMP_ALGS_STOC,
46 PROPOSAL_LANG_CTOS,
47 PROPOSAL_LANG_STOC,
48 PROPOSAL_MAX
49};
50
51enum kex_modes {
52 MODE_IN,
53 MODE_OUT,
54 MODE_MAX
55};
56
57enum kex_exchange {
58 DH_GRP1_SHA1,
5598e598 59 DH_GEX_SHA1,
60 GSS_GRP1_SHA1
3c0ef626 61};
62
63#define KEX_INIT_SENT 0x0001
64
65typedef struct Kex Kex;
66typedef struct Mac Mac;
67typedef struct Comp Comp;
68typedef struct Enc Enc;
69typedef struct Newkeys Newkeys;
70
71struct Enc {
72 char *name;
73 Cipher *cipher;
74 int enabled;
75 u_char *key;
76 u_char *iv;
77};
78struct Mac {
79 char *name;
80 int enabled;
81 EVP_MD *md;
82 int mac_len;
83 u_char *key;
84 int key_len;
85};
86struct Comp {
87 int type;
88 int enabled;
89 char *name;
90};
91struct Newkeys {
92 Enc enc;
93 Mac mac;
94 Comp comp;
95};
5598e598 96
97struct KexOptions {
98 int gss_deleg_creds;
99};
100
3c0ef626 101struct Kex {
102 u_char *session_id;
103 int session_id_len;
104 Newkeys *newkeys[MODE_MAX];
105 int we_need;
106 int server;
107 char *name;
108 int hostkey_type;
109 int kex_type;
110 Buffer my;
111 Buffer peer;
112 int done;
113 int flags;
5598e598 114 char *host;
3c0ef626 115 char *client_version_string;
116 char *server_version_string;
117 int (*verify_host_key)(Key *);
118 Key *(*load_host_key)(int);
5598e598 119 struct KexOptions options;
3c0ef626 120};
121
122Kex *kex_setup(char *[PROPOSAL_MAX]);
123void kex_finish(Kex *);
124
125void kex_send_kexinit(Kex *);
126void kex_input_kexinit(int, int, void *);
127void kex_derive_keys(Kex *, u_char *, BIGNUM *);
128
129void kexdh(Kex *);
130void kexgex(Kex *);
131
132Newkeys *kex_get_newkeys(int);
133
134#if defined(DEBUG_KEX) || defined(DEBUG_KEXDH)
135void dump_digest(char *, u_char *, int);
136#endif
137
138#endif
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