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/*
* Copyright (C) 2001,2002 Nikos Mavroyanopoulos
* Copyright (C) 2004 Free Software Foundation
*
* This file is part of GNUTLS.
*
* GNUTLS-EXTRA is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* GNUTLS-EXTRA 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; 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 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( GNUTLS_CipherSuite 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 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 cred =
_gnutls_get_cred( session->key, GNUTLS_CRD_SRP, NULL);
if (cred==NULL) return 0;
if (cred->username!=NULL) { /* send username */
len = GMIN( 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 = GMIN( 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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