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/*
* Copyright (C) 2017 Red Hat, 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 <https://www.gnu.org/licenses/>
*
*/
/* This file contains the code for the Post-Handshake TLS 1.3 extension.
*/
#include "gnutls_int.h"
#include "errors.h"
#include "num.h"
#include <hello_ext.h>
#include <ext/post_handshake.h>
#include "auth/cert.h"
static int _gnutls_post_handshake_recv_params(gnutls_session_t session,
const uint8_t * data,
size_t data_size);
static int _gnutls_post_handshake_send_params(gnutls_session_t session,
gnutls_buffer_st * extdata);
const hello_ext_entry_st ext_mod_post_handshake = {
.name = "Post Handshake Auth",
.tls_id = 49,
.gid = GNUTLS_EXTENSION_POST_HANDSHAKE,
.client_parse_point = GNUTLS_EXT_TLS,
.server_parse_point = GNUTLS_EXT_TLS,
.validity = GNUTLS_EXT_FLAG_TLS | GNUTLS_EXT_FLAG_CLIENT_HELLO,
.recv_func = _gnutls_post_handshake_recv_params,
.send_func = _gnutls_post_handshake_send_params,
.pack_func = NULL,
.unpack_func = NULL,
.deinit_func = NULL,
.cannot_be_overriden = 1
};
static int
_gnutls_post_handshake_recv_params(gnutls_session_t session,
const uint8_t * data, size_t _data_size)
{
const version_entry_st *vers;
if (session->security_parameters.entity == GNUTLS_SERVER) {
vers = get_version(session);
if (unlikely(vers == NULL))
return 0;
if ((session->internals.flags & GNUTLS_POST_HANDSHAKE_AUTH) &&
vers->post_handshake_auth)
session->security_parameters.post_handshake_auth = 1;
}
return 0;
}
/* returns data_size or a negative number on failure
*/
static int
_gnutls_post_handshake_send_params(gnutls_session_t session,
gnutls_buffer_st * extdata)
{
gnutls_certificate_credentials_t cred;
const version_entry_st *max;
if (session->security_parameters.entity != GNUTLS_CLIENT ||
!(session->internals.flags & GNUTLS_POST_HANDSHAKE_AUTH)) {
/* not sent on server side */
return 0;
}
cred = (gnutls_certificate_credentials_t)
_gnutls_get_cred(session, GNUTLS_CRD_CERTIFICATE);
if (cred == NULL) /* no certificate authentication */
return gnutls_assert_val(0);
max = _gnutls_version_max(session);
if (unlikely(max == NULL))
return gnutls_assert_val(0);
if (max->post_handshake_auth)
return GNUTLS_E_INT_RET_0;
else
return 0;
}
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