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7a37c112 | 1 | /* $OpenBSD: kex.h,v 1.21 2001/04/04 14:34:58 markus Exp $ */ |
23c2a7a5 | 2 | |
7e7327a1 | 3 | /* |
4 | * Copyright (c) 2000 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. | |
7e7327a1 | 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 | ||
b2552997 | 29 | #include <openssl/evp.h> |
30 | #include "buffer.h" | |
a5c9ffdb | 31 | #include "cipher.h" |
32 | #include "key.h" | |
b2552997 | 33 | |
94ec8c6b | 34 | #define KEX_DH1 "diffie-hellman-group1-sha1" |
35 | #define KEX_DHGEX "diffie-hellman-group-exchange-sha1" | |
7e7327a1 | 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 | ||
94ec8c6b | 57 | enum kex_exchange { |
58 | DH_GRP1_SHA1, | |
59 | DH_GEX_SHA1 | |
60 | }; | |
2b87da3b | 61 | |
d1ac6175 | 62 | #define KEX_INIT_SENT 0x0001 |
63 | ||
7e7327a1 | 64 | typedef struct Kex Kex; |
65 | typedef struct Mac Mac; | |
66 | typedef struct Comp Comp; | |
67 | typedef struct Enc Enc; | |
d1ac6175 | 68 | typedef struct Newkeys Newkeys; |
7e7327a1 | 69 | |
70 | struct Enc { | |
d1ac6175 | 71 | char *name; |
72 | Cipher *cipher; | |
73 | int enabled; | |
1e3b8b07 | 74 | u_char *key; |
75 | u_char *iv; | |
7e7327a1 | 76 | }; |
77 | struct Mac { | |
d1ac6175 | 78 | char *name; |
79 | int enabled; | |
80 | EVP_MD *md; | |
81 | int mac_len; | |
1e3b8b07 | 82 | u_char *key; |
d1ac6175 | 83 | int key_len; |
7e7327a1 | 84 | }; |
85 | struct Comp { | |
d1ac6175 | 86 | int type; |
87 | int enabled; | |
88 | char *name; | |
89 | }; | |
90 | struct Newkeys { | |
91 | Enc enc; | |
92 | Mac mac; | |
93 | Comp comp; | |
7e7327a1 | 94 | }; |
95 | struct Kex { | |
d1ac6175 | 96 | u_char *session_id; |
97 | int session_id_len; | |
98 | Newkeys *keys[MODE_MAX]; | |
99 | int we_need; | |
100 | int server; | |
101 | char *name; | |
102 | int hostkey_type; | |
103 | int kex_type; | |
104 | Buffer my; | |
105 | Buffer peer; | |
106 | int newkeys; | |
107 | int flags; | |
108 | char *client_version_string; | |
109 | char *server_version_string; | |
110 | int (*check_host_key)(Key *hostkey); | |
111 | Key *(*load_host_key)(int type); | |
7e7327a1 | 112 | }; |
113 | ||
d8ee838b | 114 | Kex *kex_setup(char *proposal[PROPOSAL_MAX]); |
115 | void kex_finish(Kex *kex); | |
116 | ||
d1ac6175 | 117 | void kex_send_kexinit(Kex *kex); |
7a37c112 | 118 | void kex_input_kexinit(int type, int plen, void *ctxt); |
d1ac6175 | 119 | void kex_derive_keys(Kex *k, u_char *hash, BIGNUM *shared_secret); |
7e7327a1 | 120 | |
a5c9ffdb | 121 | void kexdh(Kex *); |
122 | void kexgex(Kex *); | |
123 | ||
d1ac6175 | 124 | Newkeys *kex_get_newkeys(int mode); |
125 | ||
a5c9ffdb | 126 | #if defined(DEBUG_KEX) || defined(DEBUG_KEXDH) |
127 | void dump_digest(char *msg, u_char *digest, int len); | |
128 | #endif | |
7e7327a1 | 129 | |
130 | #endif |