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/*
* Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License").
* You may not use this file except in compliance with the License.
* A copy of the License is located at
*
* http://aws.amazon.com/apache2.0
*
* or in the "license" file accompanying this file. This file is distributed
* on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
* express or implied. See the License for the specific language governing
* permissions and limitations under the License.
*/
#include "tls/extensions/s2n_client_status_request.h"
#include <stdint.h>
#include <sys/param.h>
#include "tls/s2n_tls.h"
#include "tls/s2n_tls_parameters.h"
#include "utils/s2n_safety.h"
static bool s2n_client_status_request_should_send(struct s2n_connection *conn);
static int s2n_client_status_request_send(struct s2n_connection *conn, struct s2n_stuffer *out);
static int s2n_client_status_request_recv(struct s2n_connection *conn, struct s2n_stuffer *extension);
const s2n_extension_type s2n_client_status_request_extension = {
.iana_value = TLS_EXTENSION_STATUS_REQUEST,
.is_response = false,
.send = s2n_client_status_request_send,
.recv = s2n_client_status_request_recv,
.should_send = s2n_client_status_request_should_send,
.if_missing = s2n_extension_noop_if_missing,
};
static bool s2n_client_status_request_should_send(struct s2n_connection *conn)
{
return conn->config->status_request_type != S2N_STATUS_REQUEST_NONE;
}
static int s2n_client_status_request_send(struct s2n_connection *conn, struct s2n_stuffer *out)
{
POSIX_GUARD(s2n_stuffer_write_uint8(out, (uint8_t) conn->config->status_request_type));
/* responder_id_list
*
* From https://tools.ietf.org/html/rfc6066#section-8:
* A zero-length "responder_id_list" sequence has the special meaning that the responders are implicitly
* known to the server, e.g., by prior arrangement */
POSIX_GUARD(s2n_stuffer_write_uint16(out, 0));
/* request_extensions
*
* From https://tools.ietf.org/html/rfc6066#section-8:
* A zero-length "request_extensions" value means that there are no extensions. */
POSIX_GUARD(s2n_stuffer_write_uint16(out, 0));
return S2N_SUCCESS;
}
static int s2n_client_status_request_recv(struct s2n_connection *conn, struct s2n_stuffer *extension)
{
if (s2n_stuffer_data_available(extension) < 5) {
/* Malformed length, ignore the extension */
return S2N_SUCCESS;
}
uint8_t type;
POSIX_GUARD(s2n_stuffer_read_uint8(extension, &type));
if (type != (uint8_t) S2N_STATUS_REQUEST_OCSP) {
/* We only support OCSP (type 1), ignore the extension */
return S2N_SUCCESS;
}
conn->status_type = (s2n_status_request_type) type;
return S2N_SUCCESS;
}
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