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/*
* Copyright (C) 2000-2005, 2009-2010, 2012 Free Software Foundation,
* 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 3 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 <http://www.gnu.org/licenses/>
*
*/
/* This file contains the Anonymous Diffie-Hellman key exchange part of
* the anonymous authentication. The functions here are used in the
* handshake.
*/
#include <gnutls_int.h>
#ifdef ENABLE_ANON
#include "gnutls_auth.h"
#include "gnutls_errors.h"
#include "gnutls_dh.h"
#include "auth/anon.h"
#include "gnutls_num.h"
#include "gnutls_mpi.h"
#include <gnutls_state.h>
#include <auth/dh_common.h>
static int gen_anon_server_kx (gnutls_session_t, gnutls_buffer_st*);
static int proc_anon_client_kx (gnutls_session_t, opaque *, size_t);
static int proc_anon_server_kx (gnutls_session_t, opaque *, size_t);
const mod_auth_st anon_auth_struct = {
"ANON",
NULL,
NULL,
gen_anon_server_kx,
_gnutls_gen_dh_common_client_kx, /* this can be shared */
NULL,
NULL,
NULL,
NULL, /* certificate */
proc_anon_server_kx,
proc_anon_client_kx,
NULL,
NULL
};
static int
gen_anon_server_kx (gnutls_session_t session, gnutls_buffer_st* data)
{
bigint_t g, p;
const bigint_t *mpis;
int ret;
gnutls_dh_params_t dh_params;
gnutls_anon_server_credentials_t cred;
cred = (gnutls_anon_server_credentials_t)
_gnutls_get_cred (session->key, GNUTLS_CRD_ANON, NULL);
if (cred == NULL)
{
gnutls_assert ();
return GNUTLS_E_INSUFFICIENT_CREDENTIALS;
}
dh_params =
_gnutls_get_dh_params (cred->dh_params, cred->params_func, session);
mpis = _gnutls_dh_params_to_mpi (dh_params);
if (mpis == NULL)
{
gnutls_assert ();
return GNUTLS_E_NO_TEMPORARY_DH_PARAMS;
}
p = mpis[0];
g = mpis[1];
if ((ret =
_gnutls_auth_info_set (session, GNUTLS_CRD_ANON,
sizeof (anon_auth_info_st), 1)) < 0)
{
gnutls_assert ();
return ret;
}
_gnutls_dh_set_group (session, g, p);
ret = _gnutls_dh_common_print_server_kx (session, g, p, dh_params->q_bits, data);
if (ret < 0)
{
gnutls_assert ();
}
return ret;
}
static int
proc_anon_client_kx (gnutls_session_t session, opaque * data,
size_t _data_size)
{
gnutls_anon_server_credentials_t cred;
int ret;
bigint_t p, g;
gnutls_dh_params_t dh_params;
const bigint_t *mpis;
cred = (gnutls_anon_server_credentials_t)
_gnutls_get_cred (session->key, GNUTLS_CRD_ANON, NULL);
if (cred == NULL)
{
gnutls_assert ();
return GNUTLS_E_INSUFFICIENT_CREDENTIALS;
}
dh_params =
_gnutls_get_dh_params (cred->dh_params, cred->params_func, session);
mpis = _gnutls_dh_params_to_mpi (dh_params);
if (mpis == NULL)
{
gnutls_assert ();
return GNUTLS_E_NO_TEMPORARY_DH_PARAMS;
}
p = mpis[0];
g = mpis[1];
ret = _gnutls_proc_dh_common_client_kx (session, data, _data_size, g, p, NULL);
return ret;
}
int
proc_anon_server_kx (gnutls_session_t session, opaque * data,
size_t _data_size)
{
int ret;
/* set auth_info */
if ((ret =
_gnutls_auth_info_set (session, GNUTLS_CRD_ANON,
sizeof (anon_auth_info_st), 1)) < 0)
{
gnutls_assert ();
return ret;
}
ret = _gnutls_proc_dh_common_server_kx (session, data, _data_size);
if (ret < 0)
{
gnutls_assert ();
return ret;
}
return 0;
}
#endif /* ENABLE_ANON */
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