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/*
* Copyright (C) 2001, 2002, 2003, 2004, 2005, 2010 Free Software
* Foundation, Inc.
*
* Author: Nikos Mavrogiannopoulos
*
* 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.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 */
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