1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
|
/* $OpenBSD: kex.h,v 1.62 2014/01/27 18:58:14 markus Exp $ */
/*
* Copyright (c) 2000, 2001 Markus Friedl. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef KEX_H
#define KEX_H
#include <signal.h>
#include <openssl/evp.h>
#include <openssl/hmac.h>
#ifdef OPENSSL_HAS_ECC
#include <openssl/ec.h>
#endif
#define KEX_COOKIE_LEN 16
#define KEX_DH1 "diffie-hellman-group1-sha1"
#define KEX_DH14 "diffie-hellman-group14-sha1"
#define KEX_DHGEX_SHA1 "diffie-hellman-group-exchange-sha1"
#define KEX_DHGEX_SHA256 "diffie-hellman-group-exchange-sha256"
#define KEX_RESUME "resume@appgate.com"
#define KEX_ECDH_SHA2_NISTP256 "ecdh-sha2-nistp256"
#define KEX_ECDH_SHA2_NISTP384 "ecdh-sha2-nistp384"
#define KEX_ECDH_SHA2_NISTP521 "ecdh-sha2-nistp521"
#define KEX_CURVE25519_SHA256 "curve25519-sha256@libssh.org"
#define COMP_NONE 0
#define COMP_ZLIB 1
#define COMP_DELAYED 2
enum kex_init_proposals {
PROPOSAL_KEX_ALGS,
PROPOSAL_SERVER_HOST_KEY_ALGS,
PROPOSAL_ENC_ALGS_CTOS,
PROPOSAL_ENC_ALGS_STOC,
PROPOSAL_MAC_ALGS_CTOS,
PROPOSAL_MAC_ALGS_STOC,
PROPOSAL_COMP_ALGS_CTOS,
PROPOSAL_COMP_ALGS_STOC,
PROPOSAL_LANG_CTOS,
PROPOSAL_LANG_STOC,
PROPOSAL_MAX
};
enum kex_modes {
MODE_IN,
MODE_OUT,
MODE_MAX
};
enum kex_exchange {
KEX_DH_GRP1_SHA1,
KEX_DH_GRP14_SHA1,
KEX_DH_GEX_SHA1,
KEX_DH_GEX_SHA256,
KEX_ECDH_SHA2,
KEX_C25519_SHA256,
KEX_MAX
};
#define KEX_INIT_SENT 0x0001
typedef struct Kex Kex;
typedef struct Mac Mac;
typedef struct Comp Comp;
typedef struct Enc Enc;
typedef struct Newkeys Newkeys;
struct Enc {
char *name;
const Cipher *cipher;
int enabled;
u_int key_len;
u_int iv_len;
u_int block_size;
u_char *key;
u_char *iv;
};
struct Mac {
char *name;
int enabled;
u_int mac_len;
u_char *key;
u_int key_len;
int type;
int etm; /* Encrypt-then-MAC */
struct ssh_hmac_ctx *hmac_ctx;
struct umac_ctx *umac_ctx;
};
struct Comp {
int type;
int enabled;
char *name;
};
struct Newkeys {
Enc enc;
Mac mac;
Comp comp;
};
struct Kex {
u_char *session_id;
u_int session_id_len;
Newkeys *newkeys[MODE_MAX];
u_int we_need;
u_int dh_need;
int server;
char *name;
int hostkey_type;
int kex_type;
int roaming;
Buffer my;
Buffer peer;
sig_atomic_t done;
int flags;
int hash_alg;
int ec_nid;
char *client_version_string;
char *server_version_string;
int (*verify_host_key)(Key *);
Key *(*load_host_public_key)(int);
Key *(*load_host_private_key)(int);
int (*host_key_index)(Key *);
void (*sign)(Key *, Key *, u_char **, u_int *, u_char *, u_int);
void (*kex[KEX_MAX])(Kex *);
};
int kex_names_valid(const char *);
char *kex_alg_list(char);
Kex *kex_setup(char *[PROPOSAL_MAX]);
void kex_finish(Kex *);
void kex_send_kexinit(Kex *);
void kex_input_kexinit(int, u_int32_t, void *);
void kex_derive_keys(Kex *, u_char *, u_int, const u_char *, u_int);
void kex_derive_keys_bn(Kex *, u_char *, u_int, const BIGNUM *);
Newkeys *kex_get_newkeys(int);
void kexdh_client(Kex *);
void kexdh_server(Kex *);
void kexgex_client(Kex *);
void kexgex_server(Kex *);
void kexecdh_client(Kex *);
void kexecdh_server(Kex *);
void kexc25519_client(Kex *);
void kexc25519_server(Kex *);
void
kex_dh_hash(char *, char *, char *, int, char *, int, u_char *, int,
BIGNUM *, BIGNUM *, BIGNUM *, u_char **, u_int *);
void
kexgex_hash(int, char *, char *, char *, int, char *,
int, u_char *, int, int, int, int, BIGNUM *, BIGNUM *, BIGNUM *,
BIGNUM *, BIGNUM *, u_char **, u_int *);
#ifdef OPENSSL_HAS_ECC
void
kex_ecdh_hash(int, const EC_GROUP *, char *, char *, char *, int,
char *, int, u_char *, int, const EC_POINT *, const EC_POINT *,
const BIGNUM *, u_char **, u_int *);
#endif
void
kex_c25519_hash(int, char *, char *, char *, int,
char *, int, u_char *, int, const u_char *, const u_char *,
const u_char *, u_int, u_char **, u_int *);
#define CURVE25519_SIZE 32
void kexc25519_keygen(u_char[CURVE25519_SIZE], u_char[CURVE25519_SIZE])
__attribute__((__bounded__(__minbytes__, 1, CURVE25519_SIZE)))
__attribute__((__bounded__(__minbytes__, 2, CURVE25519_SIZE)));
void kexc25519_shared_key(const u_char key[CURVE25519_SIZE],
const u_char pub[CURVE25519_SIZE], Buffer *out)
__attribute__((__bounded__(__minbytes__, 1, CURVE25519_SIZE)))
__attribute__((__bounded__(__minbytes__, 2, CURVE25519_SIZE)));
void
derive_ssh1_session_id(BIGNUM *, BIGNUM *, u_int8_t[8], u_int8_t[16]);
#if defined(DEBUG_KEX) || defined(DEBUG_KEXDH) || defined(DEBUG_KEXECDH)
void dump_digest(char *, u_char *, int);
#endif
#endif
|
