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
|
/*
* Copyright (C) 2015-2016 Red Hat, 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 <https://www.gnu.org/licenses/>
*
*/
/* Functions that relate to the TLS handshake procedure.
*/
#include "gnutls_int.h"
#include "errors.h"
#include "debug.h"
#include "handshake.h"
#include <auth/cert.h>
#include "constate.h"
#include <record.h>
#include <state.h>
#include <ext/safe_renegotiation.h>
#include <auth/anon.h> /* for gnutls_anon_server_credentials_t */
#include <auth/psk.h> /* for gnutls_psk_server_credentials_t */
#ifdef ENABLE_SRP
# include <auth/srp_kx.h>
#endif
int _gnutls_check_id_for_change(gnutls_session_t session)
{
int cred_type;
/* This checks in PSK and SRP ciphersuites that the username remained the
* same on a rehandshake. */
if (session->internals.flags & GNUTLS_ALLOW_ID_CHANGE)
return 0;
cred_type = gnutls_auth_get_type(session);
if (cred_type == GNUTLS_CRD_PSK || cred_type == GNUTLS_CRD_SRP) {
const char *username = NULL;
int username_length;
if (cred_type == GNUTLS_CRD_PSK) {
psk_auth_info_t ai;
ai = _gnutls_get_auth_info(session, GNUTLS_CRD_PSK);
if (ai == NULL)
return
gnutls_assert_val(GNUTLS_E_INTERNAL_ERROR);
username = ai->username;
username_length = ai->username_len;
#ifdef ENABLE_SRP
} else {
srp_server_auth_info_t ai =
_gnutls_get_auth_info(session, GNUTLS_CRD_SRP);
if (ai == NULL)
return
gnutls_assert_val(GNUTLS_E_INTERNAL_ERROR);
username = ai->username;
username_length = strlen(ai->username);
#endif
}
if (username == NULL)
return gnutls_assert_val(GNUTLS_E_INTERNAL_ERROR);
if (session->internals.saved_username &&
session->internals.saved_username_size != -1) {
if (session->internals.saved_username_size ==
username_length
&& strncmp(session->internals.saved_username,
username, username_length)) {
_gnutls_debug_log
("Session's PSK username changed during rehandshake; aborting!\n");
return
gnutls_assert_val
(GNUTLS_E_SESSION_USER_ID_CHANGED);
}
} else if (session->internals.saved_username == NULL &&
session->internals.saved_username_size == -1) {
if (username_length > MAX_USERNAME_SIZE)
return
gnutls_assert_val(GNUTLS_E_INTERNAL_ERROR);
char *tmp = gnutls_malloc(username_length + 1);
if (tmp == NULL)
return gnutls_assert_val(GNUTLS_E_MEMORY_ERROR);
memcpy(tmp, username, username_length);
tmp[username_length] = '\0';
session->internals.saved_username = tmp;
session->internals.saved_username_size =
username_length;
} else
return gnutls_assert_val(GNUTLS_E_INTERNAL_ERROR);
}
return 0;
}
int _gnutls_check_if_cert_hash_is_same(gnutls_session_t session,
gnutls_certificate_credentials_t cred)
{
cert_auth_info_t ai;
char tmp[32];
int ret;
if (session->internals.flags & GNUTLS_ALLOW_ID_CHANGE)
return 0;
ai = _gnutls_get_auth_info(session, GNUTLS_CRD_CERTIFICATE);
if (ai == NULL || ai->ncerts == 0)
return 0;
ret = gnutls_hash_fast(GNUTLS_DIG_SHA256,
ai->raw_certificate_list[0].data,
ai->raw_certificate_list[0].size, tmp);
if (ret < 0)
return gnutls_assert_val(ret);
if (session->internals.cert_hash_set) {
if (memcmp(tmp, session->internals.cert_hash, 32) != 0) {
_gnutls_debug_log
("Session certificate changed during rehandshake; aborting!\n");
return
gnutls_assert_val(GNUTLS_E_SESSION_USER_ID_CHANGED);
}
} else {
memcpy(session->internals.cert_hash, tmp, 32);
session->internals.cert_hash_set = 1;
}
return 0;
}
|
