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
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
|
/*
* Copyright (C) 2002, 2003, 2004, 2005 Free Software Foundation
*
* Author: Nikos Mavrogiannopoulos
*
* This file is part of GNUTLS.
*
* The GNUTLS library 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 library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* USA
*
*/
/* This file contains the code the Certificate Type TLS extension.
* This extension is currently gnutls specific.
*/
#include "gnutls_int.h"
#include "gnutls_errors.h"
#include "gnutls_num.h"
#include "ext_cert_type.h"
#include "gnutls_state.h"
#include "gnutls_num.h"
inline static int _gnutls_num2cert_type (int num);
inline static int _gnutls_cert_type2num (int record_size);
/*
* In case of a server: if a CERT_TYPE extension type is received then it stores
* into the session security parameters the new value. The server may use gnutls_session_certificate_type_get(),
* to access it.
*
* In case of a client: If a cert_types have been specified then we send the extension.
*
*/
int
mhd_gtls_cert_type_recv_params (mhd_gtls_session_t session,
const opaque * data, size_t _data_size)
{
int new_type = -1, ret, i;
ssize_t data_size = _data_size;
#if MHD_DEBUG_TLS
if (session->security_parameters.entity == GNUTLS_CLIENT)
{
if (data_size > 0)
{
if (data_size != 1)
{
gnutls_assert ();
return GNUTLS_E_UNEXPECTED_PACKET_LENGTH;
}
new_type = _gnutls_num2cert_type (data[0]);
if (new_type < 0)
{
gnutls_assert ();
return new_type;
}
/* Check if we support this cert_type */
if ((ret =
mhd_gtls_session_cert_type_supported (session, new_type)) < 0)
{
gnutls_assert ();
return ret;
}
_gnutls_session_cert_type_set (session, new_type);
}
}
else
#endif
{ /* SERVER SIDE - we must check if the sent cert type is the right one
*/
if (data_size > 1)
{
uint8_t len;
len = data[0];
DECR_LEN (data_size, len);
for (i = 0; i < len; i++)
{
new_type = _gnutls_num2cert_type (data[i + 1]);
if (new_type < 0)
continue;
/* Check if we support this cert_type */
if ((ret =
mhd_gtls_session_cert_type_supported (session,
new_type)) < 0)
{
gnutls_assert ();
continue;
}
else
break;
/* new_type is ok */
}
if (new_type < 0)
{
gnutls_assert ();
return GNUTLS_E_RECEIVED_ILLEGAL_PARAMETER;
}
if ((ret =
mhd_gtls_session_cert_type_supported (session, new_type)) < 0)
{
gnutls_assert ();
/* The peer has requested unsupported certificate
* types. Instead of failing, procceed normally.
* (the ciphersuite selection would fail, or a
* non certificate ciphersuite will be selected).
*/
return 0;
}
_gnutls_session_cert_type_set (session, new_type);
}
}
return 0;
}
/* returns data_size or a negative number on failure
*/
int
mhd_gtls_cert_type_send_params (mhd_gtls_session_t session, opaque * data,
size_t data_size)
{
unsigned len, i;
/* this function sends the client extension data (dnsname) */
#if MHD_DEBUG_TLS
if (session->security_parameters.entity == GNUTLS_CLIENT)
{
if (session->internals.priorities.cert_type.num_algorithms > 0)
{
len = session->internals.priorities.cert_type.num_algorithms;
if (len == 1 &&
session->internals.priorities.cert_type.priority[0] ==
MHD_GNUTLS_CRT_X509)
{
/* We don't use this extension if X.509 certificates
* are used.
*/
return 0;
}
if (data_size < len + 1)
{
gnutls_assert ();
return GNUTLS_E_SHORT_MEMORY_BUFFER;
}
/* this is a vector!
*/
data[0] = (uint8_t) len;
for (i = 0; i < len; i++)
{
data[i + 1] =
_gnutls_cert_type2num (session->internals.
priorities.cert_type.priority[i]);
}
return len + 1;
}
}
else
#endif
{ /* server side */
if (session->security_parameters.cert_type != DEFAULT_CERT_TYPE)
{
len = 1;
if (data_size < len)
{
gnutls_assert ();
return GNUTLS_E_SHORT_MEMORY_BUFFER;
}
data[0] =
_gnutls_cert_type2num (session->security_parameters.cert_type);
return len;
}
}
return 0;
}
/* Maps numbers to record sizes according to the
* extensions draft.
*/
inline static int
_gnutls_num2cert_type (int num)
{
switch (num)
{
case 0:
return MHD_GNUTLS_CRT_X509;
default:
return GNUTLS_E_RECEIVED_ILLEGAL_PARAMETER;
}
}
/* Maps record size to numbers according to the
* extensions draft.
*/
inline static int
_gnutls_cert_type2num (int cert_type)
{
switch (cert_type)
{
case MHD_GNUTLS_CRT_X509:
return 0;
default:
return GNUTLS_E_RECEIVED_ILLEGAL_PARAMETER;
}
}
|
