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e9702f7d | 1 | /* $OpenBSD: kex.h,v 1.29 2002/02/14 23:41:01 markus Exp $ */ |
3c0ef626 | 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 | ||
37 | enum 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 | ||
51 | enum kex_modes { | |
52 | MODE_IN, | |
53 | MODE_OUT, | |
54 | MODE_MAX | |
55 | }; | |
56 | ||
57 | enum 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 | ||
65 | typedef struct Kex Kex; | |
66 | typedef struct Mac Mac; | |
67 | typedef struct Comp Comp; | |
68 | typedef struct Enc Enc; | |
69 | typedef struct Newkeys Newkeys; | |
70 | ||
71 | struct Enc { | |
72 | char *name; | |
73 | Cipher *cipher; | |
74 | int enabled; | |
e9702f7d | 75 | u_int key_len; |
76 | u_int block_size; | |
3c0ef626 | 77 | u_char *key; |
78 | u_char *iv; | |
79 | }; | |
80 | struct Mac { | |
81 | char *name; | |
82 | int enabled; | |
83 | EVP_MD *md; | |
84 | int mac_len; | |
85 | u_char *key; | |
86 | int key_len; | |
87 | }; | |
88 | struct Comp { | |
89 | int type; | |
90 | int enabled; | |
91 | char *name; | |
92 | }; | |
93 | struct Newkeys { | |
94 | Enc enc; | |
95 | Mac mac; | |
96 | Comp comp; | |
97 | }; | |
5598e598 | 98 | |
99 | struct KexOptions { | |
100 | int gss_deleg_creds; | |
101 | }; | |
102 | ||
3c0ef626 | 103 | struct Kex { |
104 | u_char *session_id; | |
105 | int session_id_len; | |
106 | Newkeys *newkeys[MODE_MAX]; | |
107 | int we_need; | |
108 | int server; | |
109 | char *name; | |
110 | int hostkey_type; | |
111 | int kex_type; | |
112 | Buffer my; | |
113 | Buffer peer; | |
114 | int done; | |
115 | int flags; | |
5598e598 | 116 | char *host; |
3c0ef626 | 117 | char *client_version_string; |
118 | char *server_version_string; | |
119 | int (*verify_host_key)(Key *); | |
120 | Key *(*load_host_key)(int); | |
5598e598 | 121 | struct KexOptions options; |
3c0ef626 | 122 | }; |
123 | ||
124 | Kex *kex_setup(char *[PROPOSAL_MAX]); | |
125 | void kex_finish(Kex *); | |
126 | ||
127 | void kex_send_kexinit(Kex *); | |
e9702f7d | 128 | void kex_input_kexinit(int, u_int32_t, void *); |
3c0ef626 | 129 | void kex_derive_keys(Kex *, u_char *, BIGNUM *); |
130 | ||
131 | void kexdh(Kex *); | |
132 | void kexgex(Kex *); | |
b2b34e95 | 133 | #ifdef GSSAPI |
134 | void kexgss(Kex *kex); | |
135 | #endif | |
3c0ef626 | 136 | Newkeys *kex_get_newkeys(int); |
137 | ||
138 | #if defined(DEBUG_KEX) || defined(DEBUG_KEXDH) | |
139 | void dump_digest(char *, u_char *, int); | |
140 | #endif | |
141 | ||
142 | #endif |