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98a58eda | 1 | /* $OpenBSD: kex.h,v 1.33 2003/02/16 17:09:57 markus Exp $ */ |
23c2a7a5 | 2 | |
7e7327a1 | 3 | /* |
a96070d4 | 4 | * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved. |
7e7327a1 | 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 { |
98a58eda | 58 | KEX_DH_GRP1_SHA1, |
59 | KEX_DH_GEX_SHA1, | |
60 | KEX_MAX | |
94ec8c6b | 61 | }; |
2b87da3b | 62 | |
d1ac6175 | 63 | #define KEX_INIT_SENT 0x0001 |
64 | ||
7e7327a1 | 65 | typedef struct Kex Kex; |
66 | typedef struct Mac Mac; | |
67 | typedef struct Comp Comp; | |
68 | typedef struct Enc Enc; | |
d1ac6175 | 69 | typedef struct Newkeys Newkeys; |
7e7327a1 | 70 | |
71 | struct Enc { | |
d1ac6175 | 72 | char *name; |
73 | Cipher *cipher; | |
74 | int enabled; | |
3ee832e5 | 75 | u_int key_len; |
76 | u_int block_size; | |
1e3b8b07 | 77 | u_char *key; |
78 | u_char *iv; | |
7e7327a1 | 79 | }; |
80 | struct Mac { | |
d1ac6175 | 81 | char *name; |
82 | int enabled; | |
7b5edc2b | 83 | const EVP_MD *md; |
d1ac6175 | 84 | int mac_len; |
1e3b8b07 | 85 | u_char *key; |
d1ac6175 | 86 | int key_len; |
7e7327a1 | 87 | }; |
88 | struct Comp { | |
d1ac6175 | 89 | int type; |
90 | int enabled; | |
91 | char *name; | |
92 | }; | |
93 | struct Newkeys { | |
94 | Enc enc; | |
95 | Mac mac; | |
96 | Comp comp; | |
7e7327a1 | 97 | }; |
98 | struct Kex { | |
d1ac6175 | 99 | u_char *session_id; |
661e45a0 | 100 | u_int session_id_len; |
c422989b | 101 | Newkeys *newkeys[MODE_MAX]; |
d1ac6175 | 102 | int we_need; |
103 | int server; | |
104 | char *name; | |
105 | int hostkey_type; | |
106 | int kex_type; | |
107 | Buffer my; | |
108 | Buffer peer; | |
c422989b | 109 | int done; |
d1ac6175 | 110 | int flags; |
111 | char *client_version_string; | |
112 | char *server_version_string; | |
2a1e4639 | 113 | int (*verify_host_key)(Key *); |
114 | Key *(*load_host_key)(int); | |
1853d1ef | 115 | int (*host_key_index)(Key *); |
98a58eda | 116 | void (*kex[KEX_MAX])(Kex *); |
7e7327a1 | 117 | }; |
118 | ||
2a1e4639 | 119 | Kex *kex_setup(char *[PROPOSAL_MAX]); |
255cabd9 | 120 | void kex_finish(Kex *); |
d8ee838b | 121 | |
255cabd9 | 122 | void kex_send_kexinit(Kex *); |
7819b5c3 | 123 | void kex_input_kexinit(int, u_int32_t, void *); |
255cabd9 | 124 | void kex_derive_keys(Kex *, u_char *, BIGNUM *); |
7e7327a1 | 125 | |
2a1e4639 | 126 | Newkeys *kex_get_newkeys(int); |
d1ac6175 | 127 | |
98a58eda | 128 | void kexdh_client(Kex *); |
129 | void kexdh_server(Kex *); | |
130 | void kexgex_client(Kex *); | |
131 | void kexgex_server(Kex *); | |
132 | ||
133 | u_char * | |
134 | kex_dh_hash(char *, char *, char *, int, char *, int, u_char *, int, | |
135 | BIGNUM *, BIGNUM *, BIGNUM *); | |
136 | u_char * | |
137 | kexgex_hash(char *, char *, char *, int, char *, int, u_char *, int, | |
138 | int, int, int, BIGNUM *, BIGNUM *, BIGNUM *, BIGNUM *, BIGNUM *); | |
139 | ||
a5c9ffdb | 140 | #if defined(DEBUG_KEX) || defined(DEBUG_KEXDH) |
2a1e4639 | 141 | void dump_digest(char *, u_char *, int); |
a5c9ffdb | 142 | #endif |
7e7327a1 | 143 | |
144 | #endif |