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
|
/*
* Copyright (C) 2000,2001 Nikos Mavroyanopoulos
*
* This file is part of GNUTLS.
*
* GNUTLS is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* GNUTLS 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#include "gnutls_int.h"
#include "gnutls_auth_int.h"
#include "gnutls_errors.h"
#include "gnutls_dh.h"
#include "gnutls_num.h"
#include "x509_asn1.h"
#include "x509_der.h"
#include "gnutls_datum.h"
#include "auth_x509.h"
#include <gnutls_random.h>
#include <gnutls_pk.h>
#include <gnutls_algorithms.h>
#include <gnutls_global.h>
#include <x509_verify.h>
#include "debug.h"
#include <gnutls_sig.h>
int gen_rsa_client_kx(GNUTLS_STATE, opaque **);
int proc_rsa_client_kx(GNUTLS_STATE, opaque *, int);
MOD_AUTH_STRUCT rsa_auth_struct =
{
"RSA",
_gnutls_gen_x509_server_certificate,
_gnutls_gen_x509_client_certificate,
NULL, /* gen server kx */
NULL, /* gen server kx2 */
NULL, /* gen client kx0 */
gen_rsa_client_kx,
_gnutls_gen_x509_client_cert_vrfy, /* gen client cert vrfy */
_gnutls_gen_x509_server_cert_req, /* server cert request */
_gnutls_proc_x509_server_certificate,
_gnutls_proc_x509_client_certificate,
NULL, /* proc server kx */
NULL, /* proc server kx2 */
NULL, /* proc client kx0 */
proc_rsa_client_kx, /* proc client kx */
_gnutls_proc_x509_client_cert_vrfy, /* proc client cert vrfy */
_gnutls_proc_x509_cert_req /* proc server cert request */
};
#define RANDOMIZE_KEY(x, galloc) x.size=TLS_MASTER_SIZE; x.data=galloc(x.size); \
if (x.data==NULL) return GNUTLS_E_MEMORY_ERROR; \
if (_gnutls_get_random( x.data, x.size, GNUTLS_WEAK_RANDOM) < 0) { \
gnutls_assert(); \
return GNUTLS_E_MEMORY_ERROR; \
}
int proc_rsa_client_kx(GNUTLS_STATE state, opaque * data, int data_size)
{
gnutls_sdatum plaintext;
gnutls_datum ciphertext;
int ret, dsize;
if ( gnutls_get_current_version(state) == GNUTLS_SSL3) {
/* SSL 3.0 */
ciphertext.data = data;
ciphertext.size = data_size;
} else { /* TLS 1 */
ciphertext.data = &data[2];
dsize = READuint16(data);
if (dsize != data_size - 2) {
gnutls_assert();
return GNUTLS_E_UNEXPECTED_PACKET_LENGTH;
}
ciphertext.size = dsize;
}
ret =
_gnutls_pkcs1_rsa_decrypt(&plaintext, ciphertext, state->gnutls_key->u,
state->gnutls_key->A, 2); /* btype==2 */
if (ret < 0) {
/* in case decryption fails then don't inform
* the peer. Just use a random key. (in order to avoid
* attack against pkcs-1 formating).
*/
return ret;
gnutls_assert();
#ifdef DEBUG
_gnutls_log( "Possible PKCS-1 format attack\n");
#endif
RANDOMIZE_KEY(state->gnutls_key->key, secure_malloc);
} else {
ret = 0;
if (plaintext.size != TLS_MASTER_SIZE) { /* WOW */
RANDOMIZE_KEY(state->gnutls_key->key, secure_malloc);
} else {
if (_gnutls_get_adv_version_major( state) != plaintext.data[0]
|| _gnutls_get_adv_version_minor( state) != plaintext.data[1]) {
gnutls_assert();
ret = GNUTLS_E_DECRYPTION_FAILED;
}
if (ret != 0) {
_gnutls_mpi_release(&state->gnutls_key->B);
_gnutls_mpi_release(&state->gnutls_key->u);
_gnutls_mpi_release(&state->gnutls_key->A);
gnutls_assert();
return ret;
}
state->gnutls_key->key.data = plaintext.data;
state->gnutls_key->key.size = plaintext.size;
}
}
_gnutls_mpi_release(&state->gnutls_key->A);
_gnutls_mpi_release(&state->gnutls_key->B);
_gnutls_mpi_release(&state->gnutls_key->u);
return 0;
}
/* return RSA(random) using the peers public key
*/
int gen_rsa_client_kx(GNUTLS_STATE state, opaque ** data)
{
X509PKI_AUTH_INFO auth = state->gnutls_key->auth_info;
gnutls_datum sdata; /* data to send */
MPI pkey, n;
int ret;
GNUTLS_Version ver;
if (auth == NULL) {
/* this shouldn't have happened. The proc_certificate
* function should have detected that.
*/
gnutls_assert();
return GNUTLS_E_INSUFICIENT_CRED;
}
RANDOMIZE_KEY(state->gnutls_key->key, secure_malloc);
ver = _gnutls_version_max(state);
state->gnutls_key->key.data[0] = _gnutls_version_get_major(ver);
state->gnutls_key->key.data[1] = _gnutls_version_get_minor(ver);
if ((ret =
_gnutls_pkcs1_rsa_encrypt(&sdata, state->gnutls_key->key, state->gnutls_key->x, state->gnutls_key->a, 2)) < 0) {
gnutls_assert();
_gnutls_mpi_release(&pkey);
_gnutls_mpi_release(&n);
return ret;
}
_gnutls_mpi_release(&state->gnutls_key->a);
_gnutls_mpi_release(&state->gnutls_key->x);
if ( ver == GNUTLS_SSL3) {
/* SSL 3.0 */
*data = sdata.data;
return sdata.size;
} else { /* TLS 1 */
*data = gnutls_malloc(sdata.size + 2);
if (*data == NULL) {
gnutls_free_datum(&sdata);
return GNUTLS_E_MEMORY_ERROR;
}
WRITEuint16(sdata.size, *data);
memcpy(&(*data)[2], sdata.data, sdata.size);
ret = sdata.size + 2;
gnutls_free_datum(&sdata);
return ret;
}
}
|
