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/*
* Copyright (C) 2000-2012 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 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 <http://www.gnu.org/licenses/>
*
*/
/* This file contains everything for the Ephemeral Diffie-Hellman
* (DHE) key exchange. This is used in the handshake procedure of the
* certificate authentication.
*/
#include "gnutls_int.h"
#include "gnutls_auth.h"
#include "gnutls_errors.h"
#include "gnutls_dh.h"
#include "gnutls_num.h"
#include "gnutls_sig.h"
#include <gnutls_datum.h>
#include <algorithms.h>
#include <auth/cert.h>
#include <gnutls_x509.h>
#include <gnutls_state.h>
#include <auth/dh_common.h>
#include <auth/ecdhe.h>
static int gen_dhe_server_kx(gnutls_session_t, gnutls_buffer_st *);
static int proc_dhe_server_kx(gnutls_session_t, uint8_t *, size_t);
static int proc_dhe_client_kx(gnutls_session_t, uint8_t *, size_t);
#ifdef ENABLE_DHE
const mod_auth_st dhe_rsa_auth_struct = {
"DHE_RSA",
_gnutls_gen_cert_server_crt,
_gnutls_gen_cert_client_crt,
gen_dhe_server_kx,
_gnutls_gen_dh_common_client_kx,
_gnutls_gen_cert_client_crt_vrfy, /* gen client cert vrfy */
_gnutls_gen_cert_server_cert_req, /* server cert request */
_gnutls_proc_crt,
_gnutls_proc_crt,
proc_dhe_server_kx,
proc_dhe_client_kx,
_gnutls_proc_cert_client_crt_vrfy, /* proc client cert vrfy */
_gnutls_proc_cert_cert_req /* proc server cert request */
};
const mod_auth_st dhe_dss_auth_struct = {
"DHE_DSS",
_gnutls_gen_cert_server_crt,
_gnutls_gen_cert_client_crt,
gen_dhe_server_kx,
_gnutls_gen_dh_common_client_kx,
_gnutls_gen_cert_client_crt_vrfy, /* gen client cert vrfy */
_gnutls_gen_cert_server_cert_req, /* server cert request */
_gnutls_proc_crt,
_gnutls_proc_crt,
proc_dhe_server_kx,
proc_dhe_client_kx,
_gnutls_proc_cert_client_crt_vrfy, /* proc client cert vrfy */
_gnutls_proc_cert_cert_req /* proc server cert request */
};
#endif
static int
gen_dhe_server_kx(gnutls_session_t session, gnutls_buffer_st * data)
{
bigint_t g, p;
const bigint_t *mpis;
int ret = 0;
gnutls_certificate_credentials_t cred;
gnutls_dh_params_t dh_params;
cred = (gnutls_certificate_credentials_t)
_gnutls_get_cred(session, GNUTLS_CRD_CERTIFICATE);
if (cred == NULL) {
gnutls_assert();
return GNUTLS_E_INSUFFICIENT_CREDENTIALS;
}
if ((ret = _gnutls_auth_info_set(session, GNUTLS_CRD_CERTIFICATE,
sizeof(cert_auth_info_st),
1)) < 0) {
gnutls_assert();
return ret;
}
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];
_gnutls_dh_set_group(session, g, p);
ret = _gnutls_set_dh_pk_params(session, g, p, dh_params->q_bits);
if (ret < 0)
return gnutls_assert_val(ret);
ret =
_gnutls_dh_common_print_server_kx(session, data);
if (ret < 0) {
gnutls_assert();
return ret;
}
/* Generate the signature. */
return _gnutls_gen_dhe_signature(session, data, data->data,
data->length);
}
static int
proc_dhe_server_kx(gnutls_session_t session, uint8_t * data,
size_t _data_size)
{
gnutls_datum_t vdata;
int ret;
ret = _gnutls_proc_dh_common_server_kx(session, data, _data_size);
if (ret < 0)
return gnutls_assert_val(ret);
vdata.data = data;
vdata.size = ret;
return _gnutls_proc_dhe_signature(session, data + ret,
_data_size - ret, &vdata);
}
static int
proc_dhe_client_kx(gnutls_session_t session, uint8_t * data,
size_t _data_size)
{
gnutls_certificate_credentials_t cred;
bigint_t p, g;
const bigint_t *mpis;
gnutls_dh_params_t dh_params;
cred = (gnutls_certificate_credentials_t)
_gnutls_get_cred(session, GNUTLS_CRD_CERTIFICATE);
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)
return gnutls_assert_val(GNUTLS_E_NO_TEMPORARY_DH_PARAMS);
p = mpis[0];
g = mpis[1];
return _gnutls_proc_dh_common_client_kx(session, data, _data_size,
g, p, NULL);
}
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