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87db7000 | 1 | /* $OpenBSD: kex.h,v 1.47 2009/05/27 06:34:36 andreas 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 | ||
0ca1dcaf | 29 | #include <signal.h> |
b2552997 | 30 | #include <openssl/evp.h> |
a3de8da1 | 31 | #include <openssl/hmac.h> |
519fc2b7 | 32 | |
87db7000 | 33 | #define KEX_COOKIE_LEN 16 |
34 | ||
47e5dc72 | 35 | #define KEX_DH1 "diffie-hellman-group1-sha1" |
36 | #define KEX_DH14 "diffie-hellman-group14-sha1" | |
37 | #define KEX_DHGEX_SHA1 "diffie-hellman-group-exchange-sha1" | |
2ff8003a | 38 | #define KEX_DHGEX_SHA256 "diffie-hellman-group-exchange-sha256" |
7e7327a1 | 39 | |
07200973 | 40 | #define COMP_NONE 0 |
41 | #define COMP_ZLIB 1 | |
42 | #define COMP_DELAYED 2 | |
43 | ||
7e7327a1 | 44 | enum kex_init_proposals { |
45 | PROPOSAL_KEX_ALGS, | |
46 | PROPOSAL_SERVER_HOST_KEY_ALGS, | |
47 | PROPOSAL_ENC_ALGS_CTOS, | |
48 | PROPOSAL_ENC_ALGS_STOC, | |
49 | PROPOSAL_MAC_ALGS_CTOS, | |
50 | PROPOSAL_MAC_ALGS_STOC, | |
51 | PROPOSAL_COMP_ALGS_CTOS, | |
52 | PROPOSAL_COMP_ALGS_STOC, | |
53 | PROPOSAL_LANG_CTOS, | |
54 | PROPOSAL_LANG_STOC, | |
55 | PROPOSAL_MAX | |
56 | }; | |
57 | ||
58 | enum kex_modes { | |
59 | MODE_IN, | |
60 | MODE_OUT, | |
61 | MODE_MAX | |
62 | }; | |
63 | ||
94ec8c6b | 64 | enum kex_exchange { |
98a58eda | 65 | KEX_DH_GRP1_SHA1, |
41e5bd9a | 66 | KEX_DH_GRP14_SHA1, |
98a58eda | 67 | KEX_DH_GEX_SHA1, |
2ff8003a | 68 | KEX_DH_GEX_SHA256, |
98a58eda | 69 | KEX_MAX |
94ec8c6b | 70 | }; |
2b87da3b | 71 | |
d1ac6175 | 72 | #define KEX_INIT_SENT 0x0001 |
73 | ||
7e7327a1 | 74 | typedef struct Kex Kex; |
75 | typedef struct Mac Mac; | |
76 | typedef struct Comp Comp; | |
77 | typedef struct Enc Enc; | |
d1ac6175 | 78 | typedef struct Newkeys Newkeys; |
7e7327a1 | 79 | |
80 | struct Enc { | |
d1ac6175 | 81 | char *name; |
82 | Cipher *cipher; | |
83 | int enabled; | |
3ee832e5 | 84 | u_int key_len; |
85 | u_int block_size; | |
1e3b8b07 | 86 | u_char *key; |
87 | u_char *iv; | |
7e7327a1 | 88 | }; |
89 | struct Mac { | |
d1ac6175 | 90 | char *name; |
91 | int enabled; | |
2ceb8101 | 92 | u_int mac_len; |
1e3b8b07 | 93 | u_char *key; |
2ceb8101 | 94 | u_int key_len; |
f444d0f8 | 95 | int type; |
96 | const EVP_MD *evp_md; | |
97 | HMAC_CTX evp_ctx; | |
98 | struct umac_ctx *umac_ctx; | |
7e7327a1 | 99 | }; |
100 | struct Comp { | |
d1ac6175 | 101 | int type; |
102 | int enabled; | |
103 | char *name; | |
104 | }; | |
105 | struct Newkeys { | |
106 | Enc enc; | |
107 | Mac mac; | |
108 | Comp comp; | |
7e7327a1 | 109 | }; |
110 | struct Kex { | |
d1ac6175 | 111 | u_char *session_id; |
661e45a0 | 112 | u_int session_id_len; |
c422989b | 113 | Newkeys *newkeys[MODE_MAX]; |
2ceb8101 | 114 | u_int we_need; |
d1ac6175 | 115 | int server; |
116 | char *name; | |
117 | int hostkey_type; | |
118 | int kex_type; | |
119 | Buffer my; | |
120 | Buffer peer; | |
50394f26 | 121 | sig_atomic_t done; |
d1ac6175 | 122 | int flags; |
47e5dc72 | 123 | const EVP_MD *evp_md; |
d1ac6175 | 124 | char *client_version_string; |
125 | char *server_version_string; | |
2a1e4639 | 126 | int (*verify_host_key)(Key *); |
127 | Key *(*load_host_key)(int); | |
1853d1ef | 128 | int (*host_key_index)(Key *); |
98a58eda | 129 | void (*kex[KEX_MAX])(Kex *); |
7e7327a1 | 130 | }; |
131 | ||
2a1e4639 | 132 | Kex *kex_setup(char *[PROPOSAL_MAX]); |
255cabd9 | 133 | void kex_finish(Kex *); |
d8ee838b | 134 | |
255cabd9 | 135 | void kex_send_kexinit(Kex *); |
7819b5c3 | 136 | void kex_input_kexinit(int, u_int32_t, void *); |
47e5dc72 | 137 | void kex_derive_keys(Kex *, u_char *, u_int, BIGNUM *); |
7e7327a1 | 138 | |
2a1e4639 | 139 | Newkeys *kex_get_newkeys(int); |
d1ac6175 | 140 | |
98a58eda | 141 | void kexdh_client(Kex *); |
142 | void kexdh_server(Kex *); | |
143 | void kexgex_client(Kex *); | |
144 | void kexgex_server(Kex *); | |
145 | ||
47e5dc72 | 146 | void |
98a58eda | 147 | kex_dh_hash(char *, char *, char *, int, char *, int, u_char *, int, |
47e5dc72 | 148 | BIGNUM *, BIGNUM *, BIGNUM *, u_char **, u_int *); |
149 | void | |
150 | kexgex_hash(const EVP_MD *, char *, char *, char *, int, char *, | |
0e03e3d0 | 151 | int, u_char *, int, int, int, int, BIGNUM *, BIGNUM *, BIGNUM *, |
47e5dc72 | 152 | BIGNUM *, BIGNUM *, u_char **, u_int *); |
98a58eda | 153 | |
7e9a0e92 | 154 | void |
155 | derive_ssh1_session_id(BIGNUM *, BIGNUM *, u_int8_t[8], u_int8_t[16]); | |
156 | ||
a5c9ffdb | 157 | #if defined(DEBUG_KEX) || defined(DEBUG_KEXDH) |
2a1e4639 | 158 | void dump_digest(char *, u_char *, int); |
a5c9ffdb | 159 | #endif |
7e7327a1 | 160 | |
161 | #endif |