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b5afdff5 | 1 | /* $OpenBSD: kex.h,v 1.47 2009/05/27 06:34:36 andreas 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 | ||
30460aeb | 29 | #include <signal.h> |
3c0ef626 | 30 | #include <openssl/evp.h> |
fa0f0f45 | 31 | #include <openssl/hmac.h> |
3c0ef626 | 32 | |
b5afdff5 | 33 | #define KEX_COOKIE_LEN 16 |
34 | ||
08822d99 | 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" | |
30460aeb | 38 | #define KEX_DHGEX_SHA256 "diffie-hellman-group-exchange-sha256" |
3c0ef626 | 39 | |
2ce0bfe4 | 40 | #define COMP_NONE 0 |
41 | #define COMP_ZLIB 1 | |
42 | #define COMP_DELAYED 2 | |
43 | ||
3c0ef626 | 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 | ||
64 | enum kex_exchange { | |
8afc6a66 | 65 | KEX_DH_GRP1_SHA1, |
7e82606e | 66 | KEX_DH_GRP14_SHA1, |
8afc6a66 | 67 | KEX_DH_GEX_SHA1, |
f713db99 | 68 | KEX_DH_GEX_SHA256, |
8afc6a66 | 69 | KEX_GSS_GRP1_SHA1, |
f713db99 | 70 | KEX_GSS_GRP14_SHA1, |
fe4ad273 | 71 | KEX_GSS_GEX_SHA1, |
8afc6a66 | 72 | KEX_MAX |
3c0ef626 | 73 | }; |
74 | ||
75 | #define KEX_INIT_SENT 0x0001 | |
76 | ||
77 | typedef struct Kex Kex; | |
78 | typedef struct Mac Mac; | |
79 | typedef struct Comp Comp; | |
80 | typedef struct Enc Enc; | |
81 | typedef struct Newkeys Newkeys; | |
82 | ||
83 | struct Enc { | |
84 | char *name; | |
85 | Cipher *cipher; | |
86 | int enabled; | |
e9702f7d | 87 | u_int key_len; |
88 | u_int block_size; | |
3c0ef626 | 89 | u_char *key; |
90 | u_char *iv; | |
91 | }; | |
92 | struct Mac { | |
93 | char *name; | |
94 | int enabled; | |
2ce0bfe4 | 95 | u_int mac_len; |
3c0ef626 | 96 | u_char *key; |
2ce0bfe4 | 97 | u_int key_len; |
fa0f0f45 | 98 | int type; |
99 | const EVP_MD *evp_md; | |
100 | HMAC_CTX evp_ctx; | |
101 | struct umac_ctx *umac_ctx; | |
3c0ef626 | 102 | }; |
103 | struct Comp { | |
104 | int type; | |
105 | int enabled; | |
106 | char *name; | |
107 | }; | |
108 | struct Newkeys { | |
109 | Enc enc; | |
110 | Mac mac; | |
111 | Comp comp; | |
112 | }; | |
5598e598 | 113 | |
3c0ef626 | 114 | struct Kex { |
115 | u_char *session_id; | |
d03f4262 | 116 | u_int session_id_len; |
3c0ef626 | 117 | Newkeys *newkeys[MODE_MAX]; |
2ce0bfe4 | 118 | u_int we_need; |
3c0ef626 | 119 | int server; |
120 | char *name; | |
121 | int hostkey_type; | |
122 | int kex_type; | |
123 | Buffer my; | |
124 | Buffer peer; | |
30460aeb | 125 | sig_atomic_t done; |
3c0ef626 | 126 | int flags; |
08822d99 | 127 | const EVP_MD *evp_md; |
fe4ad273 | 128 | #ifdef GSSAPI |
c06c9ae8 | 129 | int gss_deleg_creds; |
fe4ad273 | 130 | int gss_trust_dns; |
131 | char *gss_host; | |
f97edba6 | 132 | char *gss_client; |
fe4ad273 | 133 | #endif |
3c0ef626 | 134 | char *client_version_string; |
135 | char *server_version_string; | |
136 | int (*verify_host_key)(Key *); | |
137 | Key *(*load_host_key)(int); | |
350391c5 | 138 | int (*host_key_index)(Key *); |
8afc6a66 | 139 | void (*kex[KEX_MAX])(Kex *); |
3c0ef626 | 140 | }; |
141 | ||
473db5ab | 142 | void kex_prop2buf(Buffer *, char *proposal[PROPOSAL_MAX]); |
143 | ||
3c0ef626 | 144 | Kex *kex_setup(char *[PROPOSAL_MAX]); |
145 | void kex_finish(Kex *); | |
146 | ||
147 | void kex_send_kexinit(Kex *); | |
e9702f7d | 148 | void kex_input_kexinit(int, u_int32_t, void *); |
08822d99 | 149 | void kex_derive_keys(Kex *, u_char *, u_int, BIGNUM *); |
3c0ef626 | 150 | |
8afc6a66 | 151 | Newkeys *kex_get_newkeys(int); |
152 | ||
153 | void kexdh_client(Kex *); | |
154 | void kexdh_server(Kex *); | |
155 | void kexgex_client(Kex *); | |
156 | void kexgex_server(Kex *); | |
fe4ad273 | 157 | |
b2b34e95 | 158 | #ifdef GSSAPI |
fe4ad273 | 159 | void kexgss_client(Kex *); |
160 | void kexgss_server(Kex *); | |
b2b34e95 | 161 | #endif |
905081a4 | 162 | |
08822d99 | 163 | void |
8afc6a66 | 164 | kex_dh_hash(char *, char *, char *, int, char *, int, u_char *, int, |
08822d99 | 165 | BIGNUM *, BIGNUM *, BIGNUM *, u_char **, u_int *); |
166 | void | |
167 | kexgex_hash(const EVP_MD *, char *, char *, char *, int, char *, | |
30460aeb | 168 | int, u_char *, int, int, int, int, BIGNUM *, BIGNUM *, BIGNUM *, |
08822d99 | 169 | BIGNUM *, BIGNUM *, u_char **, u_int *); |
3c0ef626 | 170 | |
7e82606e | 171 | void |
172 | derive_ssh1_session_id(BIGNUM *, BIGNUM *, u_int8_t[8], u_int8_t[16]); | |
173 | ||
3c0ef626 | 174 | #if defined(DEBUG_KEX) || defined(DEBUG_KEXDH) |
175 | void dump_digest(char *, u_char *, int); | |
176 | #endif | |
177 | ||
178 | #endif |