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/*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307
* 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 len;
ssize_t data_size = _data_size;
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;
}
if (session->security_parameters.entity == GNUTLS_SERVER) {
if (data_size > 0) {
len = data[0];
DECR_LEN(data_size, len);
if (sizeof
(session->security_parameters.extensions.srp_username) <=
len) {
gnutls_assert();
return GNUTLS_E_ILLEGAL_SRP_USERNAME;
}
memcpy(session->security_parameters.extensions.srp_username,
&data[1], len);
session->security_parameters.extensions.srp_username[len] = 0; /* null terminated */
}
}
return 0;
}
/* Checks if the given cipher suite is an SRP one
*/
inline static int is_srp(cipher_suite_st suite)
{
int kx = _gnutls_cipher_suite_get_kx_algo(&suite);
if (IS_SRP_KX(kx))
return 1;
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)
{
uint 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) {
const gnutls_srp_client_credentials_t cred =
_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) 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,
session->internals.handshake_restarted,
&username, &password) < 0 || username == NULL
|| password == NULL) {
if (session->internals.handshake_restarted) {
gnutls_assert();
return GNUTLS_E_ILLEGAL_SRP_USERNAME;
}
return 0;
}
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) len;
memcpy(&data[1], username, len);
return len + 1;
}
}
return 0;
}
#endif /* ENABLE_SRP */
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