kex.h revision 113908 
1/*	$OpenBSD: kex.h,v 1.33 2003/02/16 17:09:57 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	KEX_DH_GRP1_SHA1,
59	KEX_DH_GEX_SHA1,
60	KEX_MAX
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_int	key_len;
76	u_int	block_size;
77	u_char	*key;
78	u_char	*iv;
79};
80struct Mac {
81	char	*name;
82	int	enabled;
83	const EVP_MD	*md;
84	int	mac_len;
85	u_char	*key;
86	int	key_len;
87};
88struct Comp {
89	int	type;
90	int	enabled;
91	char	*name;
92};
93struct Newkeys {
94	Enc	enc;
95	Mac	mac;
96	Comp	comp;
97};
98struct Kex {
99	u_char	*session_id;
100	u_int	session_id_len;
101	Newkeys	*newkeys[MODE_MAX];
102	int	we_need;
103	int	server;
104	char	*name;
105	int	hostkey_type;
106	int	kex_type;
107	Buffer	my;
108	Buffer	peer;
109	int	done;
110	int	flags;
111	char	*client_version_string;
112	char	*server_version_string;
113	int	(*verify_host_key)(Key *);
114	Key	*(*load_host_key)(int);
115	int	(*host_key_index)(Key *);
116	void	(*kex[KEX_MAX])(Kex *);
117};
118
119Kex	*kex_setup(char *[PROPOSAL_MAX]);
120void	 kex_finish(Kex *);
121
122void	 kex_send_kexinit(Kex *);
123void	 kex_input_kexinit(int, u_int32_t, void *);
124void	 kex_derive_keys(Kex *, u_char *, BIGNUM *);
125
126Newkeys *kex_get_newkeys(int);
127
128void	 kexdh_client(Kex *);
129void	 kexdh_server(Kex *);
130void	 kexgex_client(Kex *);
131void	 kexgex_server(Kex *);
132
133u_char *
134kex_dh_hash(char *, char *, char *, int, char *, int, u_char *, int,
135    BIGNUM *, BIGNUM *, BIGNUM *);
136u_char *
137kexgex_hash(char *, char *, char *, int, char *, int, u_char *, int,
138    int, int, int, BIGNUM *, BIGNUM *, BIGNUM *, BIGNUM *, BIGNUM *);
139
140#if defined(DEBUG_KEX) || defined(DEBUG_KEXDH)
141void	dump_digest(char *, u_char *, int);
142#endif
143
144#endif
145