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/*
* 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;
}
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