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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 <http://www.gnu.org/licenses/>
*
*/
#include "gnutls_int.h"
#include "errors.h"
#include "extv.h"
#include "handshake.h"
#include "tls13/certificate_request.h"
#include "ext/signature.h"
#include "mbuffers.h"
static
int parse_cert_extension(void *ctx, uint16_t tls_id, const uint8_t *data, int data_size)
{
/* ignore all exts */
return 0;
}
int _gnutls13_recv_certificate_request(gnutls_session_t session)
{
int ret;
gnutls_buffer_st buf;
ret = _gnutls_recv_handshake(session, GNUTLS_HANDSHAKE_CERTIFICATE_REQUEST, 1, &buf);
if (ret < 0)
return gnutls_assert_val(ret);
/* if not received */
if (buf.length == 0) {
_gnutls_buffer_clear(&buf);
return 0;
}
_gnutls_handshake_log("HSK[%p]: parsing certificate request\n", session);
if (buf.data[0] != 0) {
/* The context field must be empty during handshake */
gnutls_assert();
return gnutls_assert_val(GNUTLS_E_RECEIVED_ILLEGAL_PARAMETER);
}
/* buf.length is positive */
buf.data++;
buf.length--;
ret = _gnutls_extv_parse(NULL, parse_cert_extension, buf.data, buf.length);
_gnutls_buffer_clear(&buf);
if (ret < 0)
return gnutls_assert_val(ret);
session->internals.hsk_flags |= HSK_CRT_ASKED;
return 0;
}
int _gnutls13_send_certificate_request(gnutls_session_t session, unsigned again)
{
gnutls_certificate_credentials_t cred;
int ret;
mbuffer_st *bufel = NULL;
gnutls_buffer_st buf;
unsigned init_pos;
if (again == 0) {
if (session->internals.send_cert_req == 0)
return 0;
cred = (gnutls_certificate_credentials_t)
_gnutls_get_cred(session, GNUTLS_CRD_CERTIFICATE);
if (cred == NULL)
return gnutls_assert_val(GNUTLS_E_INSUFFICIENT_CREDENTIALS);
ret = _gnutls_buffer_init_handshake_mbuffer(&buf);
if (ret < 0)
return gnutls_assert_val(ret);
ret = _gnutls_buffer_append_prefix(&buf, 8, 0);
if (ret < 0) {
gnutls_assert();
goto cleanup;
}
ret = _gnutls_extv_append_init(&buf);
if (ret < 0) {
gnutls_assert();
goto cleanup;
}
init_pos = ret;
ret = _gnutls_extv_append(&buf, ext_mod_sig.tls_id, session,
(extv_append_func)_gnutls_sign_algorithm_write_params);
if (ret < 0) {
gnutls_assert();
goto cleanup;
}
ret = _gnutls_extv_append_final(&buf, init_pos);
if (ret < 0) {
gnutls_assert();
goto cleanup;
}
bufel = _gnutls_buffer_to_mbuffer(&buf);
session->internals.hsk_flags |= HSK_CRT_REQ_SENT;
}
return _gnutls_send_handshake(session, bufel, GNUTLS_HANDSHAKE_CERTIFICATE_REQUEST);
cleanup:
_gnutls_buffer_clear(&buf);
return ret;
}
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