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
|
/*
* Copyright (C) 2000-2012 Free Software Foundation, Inc.
*
* Author: Nikos Mavrogiannopoulos
*
* This file is part of GnuTLS.
*
* The GnuTLS is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>
*
*/
/* This file contains everything for the Ephemeral Diffie-Hellman
* (DHE) key exchange. This is used in the handshake procedure of the
* certificate authentication.
*/
#include "gnutls_int.h"
#include "gnutls_auth.h"
#include "gnutls_errors.h"
#include "gnutls_dh.h"
#include "gnutls_num.h"
#include "gnutls_sig.h"
#include <gnutls_datum.h>
#include <algorithms.h>
#include <auth/cert.h>
#include <gnutls_x509.h>
#include <gnutls_state.h>
#include <auth/dh_common.h>
#include <auth/ecdhe.h>
static int gen_dhe_server_kx (gnutls_session_t, gnutls_buffer_st*);
static int proc_dhe_server_kx (gnutls_session_t, uint8_t *, size_t);
static int proc_dhe_client_kx (gnutls_session_t, uint8_t *, size_t);
#ifdef ENABLE_DHE
const mod_auth_st dhe_rsa_auth_struct = {
"DHE_RSA",
_gnutls_gen_cert_server_crt,
_gnutls_gen_cert_client_crt,
gen_dhe_server_kx,
_gnutls_gen_dh_common_client_kx,
_gnutls_gen_cert_client_crt_vrfy, /* gen client cert vrfy */
_gnutls_gen_cert_server_cert_req, /* server cert request */
_gnutls_proc_crt,
_gnutls_proc_crt,
proc_dhe_server_kx,
proc_dhe_client_kx,
_gnutls_proc_cert_client_crt_vrfy, /* proc client cert vrfy */
_gnutls_proc_cert_cert_req /* proc server cert request */
};
const mod_auth_st dhe_dss_auth_struct = {
"DHE_DSS",
_gnutls_gen_cert_server_crt,
_gnutls_gen_cert_client_crt,
gen_dhe_server_kx,
_gnutls_gen_dh_common_client_kx,
_gnutls_gen_cert_client_crt_vrfy, /* gen client cert vrfy */
_gnutls_gen_cert_server_cert_req, /* server cert request */
_gnutls_proc_crt,
_gnutls_proc_crt,
proc_dhe_server_kx,
proc_dhe_client_kx,
_gnutls_proc_cert_client_crt_vrfy, /* proc client cert vrfy */
_gnutls_proc_cert_cert_req /* proc server cert request */
};
#endif
static int
gen_dhe_server_kx (gnutls_session_t session, gnutls_buffer_st* data)
{
bigint_t g, p;
const bigint_t *mpis;
int ret = 0;
gnutls_certificate_credentials_t cred;
gnutls_dh_params_t dh_params;
cred = (gnutls_certificate_credentials_t)
_gnutls_get_cred (session, GNUTLS_CRD_CERTIFICATE, NULL);
if (cred == NULL)
{
gnutls_assert ();
return GNUTLS_E_INSUFFICIENT_CREDENTIALS;
}
if ((ret = _gnutls_auth_info_set (session, GNUTLS_CRD_CERTIFICATE,
sizeof (cert_auth_info_st), 0)) < 0)
{
gnutls_assert ();
return ret;
}
dh_params =
_gnutls_get_dh_params (cred->dh_params, cred->params_func, session);
mpis = _gnutls_dh_params_to_mpi (dh_params);
if (mpis == NULL)
{
gnutls_assert ();
return GNUTLS_E_NO_TEMPORARY_DH_PARAMS;
}
p = mpis[0];
g = mpis[1];
_gnutls_dh_set_group (session, g, p);
ret = _gnutls_dh_common_print_server_kx (session, g, p, dh_params->q_bits, data);
if (ret < 0)
{
gnutls_assert ();
return ret;
}
/* Generate the signature. */
return _gnutls_gen_dhe_signature(session, data, data->data, data->length);
}
static int
proc_dhe_server_kx (gnutls_session_t session, uint8_t * data,
size_t _data_size)
{
gnutls_datum_t vdata;
int ret;
ret = _gnutls_proc_dh_common_server_kx(session, data, _data_size);
if (ret < 0)
return gnutls_assert_val(ret);
vdata.data = data;
vdata.size = ret;
return _gnutls_proc_dhe_signature(session, data+ret, _data_size-ret, &vdata);
}
static int
proc_dhe_client_kx (gnutls_session_t session, uint8_t * data,
size_t _data_size)
{
gnutls_certificate_credentials_t cred;
bigint_t p, g;
const bigint_t *mpis;
gnutls_dh_params_t dh_params;
cred = (gnutls_certificate_credentials_t)
_gnutls_get_cred (session, GNUTLS_CRD_CERTIFICATE, NULL);
if (cred == NULL)
{
gnutls_assert ();
return GNUTLS_E_INSUFFICIENT_CREDENTIALS;
}
dh_params =
_gnutls_get_dh_params (cred->dh_params, cred->params_func, session);
mpis = _gnutls_dh_params_to_mpi (dh_params);
if (mpis == NULL)
return gnutls_assert_val(GNUTLS_E_NO_TEMPORARY_DH_PARAMS);
p = mpis[0];
g = mpis[1];
return _gnutls_proc_dh_common_client_kx (session, data, _data_size, g, p, NULL);
}
|
