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
|
/*
* Copyright (C) 2001, 2002, 2003, 2004, 2005 Free Software Foundation
*
* Author: Nikos Mavroyanopoulos
*
* 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
*
*/
#include <gnutls_int.h>
#include <ext_srp.h>
#ifdef ENABLE_SRP
#include "gnutls_auth_int.h"
#include "auth_srp.h"
#include "gnutls_errors.h"
#include "gnutls_algorithms.h"
#include <gnutls_num.h>
int
_gnutls_srp_recv_params (gnutls_session_t session, const opaque * data,
size_t _data_size)
{
uint8_t len;
ssize_t data_size = _data_size;
if (session->security_parameters.entity == GNUTLS_SERVER)
{
if (data_size > 0)
{
len = data[0];
DECR_LEN (data_size, len);
if (MAX_SRP_USERNAME < len)
{
gnutls_assert ();
return GNUTLS_E_ILLEGAL_SRP_USERNAME;
}
memcpy (session->security_parameters.extensions.srp_username,
&data[1], len);
/* null terminated */
session->security_parameters.extensions.srp_username[len] = 0;
}
}
return 0;
}
/* returns data_size or a negative number on failure
* data is allocated locally
*/
int
_gnutls_srp_send_params (gnutls_session_t session, opaque * data,
size_t data_size)
{
unsigned len;
if (_gnutls_kx_priority (session, GNUTLS_KX_SRP) < 0 &&
_gnutls_kx_priority (session, GNUTLS_KX_SRP_DSS) < 0 &&
_gnutls_kx_priority (session, GNUTLS_KX_SRP_RSA) < 0)
{
/* algorithm was not allowed in this session
*/
return 0;
}
/* this function sends the client extension data (username) */
if (session->security_parameters.entity == GNUTLS_CLIENT)
{
gnutls_srp_client_credentials_t cred = (gnutls_srp_client_credentials_t)
_gnutls_get_cred (session->key, GNUTLS_CRD_SRP, NULL);
if (cred == NULL)
return 0;
if (cred->username != NULL)
{ /* send username */
len = MIN (strlen (cred->username), 255);
if (data_size < len + 1)
{
gnutls_assert ();
return GNUTLS_E_SHORT_MEMORY_BUFFER;
}
data[0] = (uint8_t) len;
memcpy (&data[1], cred->username, len);
return len + 1;
}
else if (cred->get_function != NULL)
{
/* Try the callback
*/
char *username = NULL, *password = NULL;
if (cred->get_function (session, &username, &password) < 0
|| username == NULL || password == NULL)
{
gnutls_assert ();
return GNUTLS_E_ILLEGAL_SRP_USERNAME;
}
len = MIN (strlen (username), 255);
if (data_size < len + 1)
{
gnutls_free (username);
gnutls_free (password);
gnutls_assert ();
return GNUTLS_E_SHORT_MEMORY_BUFFER;
}
session->internals.srp_username = username;
session->internals.srp_password = password;
data[0] = (uint8_t) len;
memcpy (&data[1], username, len);
return len + 1;
}
}
return 0;
}
#endif /* ENABLE_SRP */
|
