blob: 212958131272e1c827d3724ea1e261dc68470e6f [file] [log] [blame]
Damien Miller33b13562000-04-04 14:38:59 +10001/*
2 * Copyright (c) 2000 Markus Friedl. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
Damien Miller33b13562000-04-04 14:38:59 +100012 *
13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
14 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
15 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
16 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
17 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
18 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
19 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
20 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
21 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
22 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
23 */
24#ifndef KEX_H
25#define KEX_H
26
Damien Miller874d77b2000-10-14 16:23:11 +110027#define KEX_DH1 "diffie-hellman-group1-sha1"
28#define KEX_DHGEX "diffie-hellman-group-exchange-sha1"
29#define KEX_DSS "ssh-dss"
Damien Miller33b13562000-04-04 14:38:59 +100030
31enum kex_init_proposals {
32 PROPOSAL_KEX_ALGS,
33 PROPOSAL_SERVER_HOST_KEY_ALGS,
34 PROPOSAL_ENC_ALGS_CTOS,
35 PROPOSAL_ENC_ALGS_STOC,
36 PROPOSAL_MAC_ALGS_CTOS,
37 PROPOSAL_MAC_ALGS_STOC,
38 PROPOSAL_COMP_ALGS_CTOS,
39 PROPOSAL_COMP_ALGS_STOC,
40 PROPOSAL_LANG_CTOS,
41 PROPOSAL_LANG_STOC,
42 PROPOSAL_MAX
43};
44
45enum kex_modes {
46 MODE_IN,
47 MODE_OUT,
48 MODE_MAX
49};
50
Damien Miller874d77b2000-10-14 16:23:11 +110051enum kex_exchange {
52 DH_GRP1_SHA1,
53 DH_GEX_SHA1
54};
55
Damien Miller33b13562000-04-04 14:38:59 +100056typedef struct Kex Kex;
57typedef struct Mac Mac;
58typedef struct Comp Comp;
59typedef struct Enc Enc;
60
61struct Enc {
Damien Miller874d77b2000-10-14 16:23:11 +110062 char *name;
63 Cipher *cipher;
Damien Miller33b13562000-04-04 14:38:59 +100064 int enabled;
Damien Miller33b13562000-04-04 14:38:59 +100065 unsigned char *key;
66 unsigned char *iv;
Damien Miller33b13562000-04-04 14:38:59 +100067};
68struct Mac {
Damien Miller874d77b2000-10-14 16:23:11 +110069 char *name;
Damien Miller33b13562000-04-04 14:38:59 +100070 int enabled;
Damien Miller874d77b2000-10-14 16:23:11 +110071 EVP_MD *md;
Damien Miller33b13562000-04-04 14:38:59 +100072 int mac_len;
73 unsigned char *key;
74 int key_len;
Damien Miller33b13562000-04-04 14:38:59 +100075};
76struct Comp {
77 int type;
78 int enabled;
79 char *name;
80};
81struct Kex {
82 Enc enc [MODE_MAX];
83 Mac mac [MODE_MAX];
84 Comp comp[MODE_MAX];
85 int we_need;
86 int server;
87 char *name;
88 char *hostkeyalg;
Damien Miller874d77b2000-10-14 16:23:11 +110089 int kex_type;
Damien Miller33b13562000-04-04 14:38:59 +100090};
91
92Buffer *kex_init(char *myproposal[PROPOSAL_MAX]);
Damien Millerb1715dc2000-05-30 13:44:51 +100093void
94kex_exchange_kexinit(
95 Buffer *my_kexinit, Buffer *peer_kexint,
96 char *peer_proposal[PROPOSAL_MAX]);
97Kex *
98kex_choose_conf(char *cprop[PROPOSAL_MAX],
99 char *sprop[PROPOSAL_MAX], int server);
100int kex_derive_keys(Kex *k, unsigned char *hash, BIGNUM *shared_secret);
101void packet_set_kex(Kex *k);
Damien Miller78928792000-04-12 20:17:38 +1000102int dh_pub_is_valid(DH *dh, BIGNUM *dh_pub);
Damien Miller874d77b2000-10-14 16:23:11 +1100103DH *dh_new_group_asc(const char *, const char *);
104DH *dh_new_group(BIGNUM *, BIGNUM *);
Damien Miller78928792000-04-12 20:17:38 +1000105DH *dh_new_group1();
Damien Miller33b13562000-04-04 14:38:59 +1000106
107unsigned char *
108kex_hash(
109 char *client_version_string,
110 char *server_version_string,
111 char *ckexinit, int ckexinitlen,
112 char *skexinit, int skexinitlen,
113 char *serverhostkeyblob, int sbloblen,
114 BIGNUM *client_dh_pub,
115 BIGNUM *server_dh_pub,
116 BIGNUM *shared_secret);
117
Damien Miller874d77b2000-10-14 16:23:11 +1100118unsigned char *
119kex_hash_gex(
120 char *client_version_string,
121 char *server_version_string,
122 char *ckexinit, int ckexinitlen,
123 char *skexinit, int skexinitlen,
124 char *serverhostkeyblob, int sbloblen,
125 int minbits, BIGNUM *prime, BIGNUM *gen,
126 BIGNUM *client_dh_pub,
127 BIGNUM *server_dh_pub,
128 BIGNUM *shared_secret);
Damien Miller33b13562000-04-04 14:38:59 +1000129#endif