kex.h revision 69587 
1/*
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.
12 *
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
27#define	KEX_DH1		"diffie-hellman-group1-sha1"
28#define	KEX_DHGEX	"diffie-hellman-group-exchange-sha1"
29#define	KEX_DSS		"ssh-dss"
30
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
51enum kex_exchange {
52	DH_GRP1_SHA1,
53	DH_GEX_SHA1
54};
55
56typedef struct Kex Kex;
57typedef struct Mac Mac;
58typedef struct Comp Comp;
59typedef struct Enc Enc;
60
61struct Enc {
62	char		*name;
63	Cipher		*cipher;
64	int		enabled;
65	unsigned char	*key;
66	unsigned char	*iv;
67};
68struct Mac {
69	char		*name;
70	int		enabled;
71	EVP_MD		*md;
72	int		mac_len;
73	unsigned char	*key;
74	int		key_len;
75};
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;
89	int		kex_type;
90};
91
92Buffer	*kex_init(char *myproposal[PROPOSAL_MAX]);
93void
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);
102int	dh_pub_is_valid(DH *dh, BIGNUM *dh_pub);
103DH	*dh_new_group_asc(const char *, const char *);
104DH	*dh_new_group(BIGNUM *, BIGNUM *);
105DH	*dh_new_group1();
106
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
118unsigned 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);
129#endif
130