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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 "api/s2n.h"
#include "stuffer/s2n_stuffer.h"
#include "tls/extensions/s2n_early_data_indication.h"
#include "tls/s2n_connection.h"
#include "tls/s2n_early_data.h"
#include "utils/s2n_safety.h"
static bool s2n_nst_early_data_indication_should_send(struct s2n_connection *conn)
{
uint32_t server_max_early_data = 0;
return s2n_result_is_ok(s2n_early_data_get_server_max_size(conn, &server_max_early_data))
&& server_max_early_data > 0;
}
/**
* The client version of this extension is empty, so we don't read/write any data.
*
*= https://tools.ietf.org/rfc/rfc8446#section-4.2.10
*# The "extension_data" field of this extension contains an
*# "EarlyDataIndication" value.
*#
*# struct {} Empty;
*#
*# struct {
*# select (Handshake.msg_type) {
*# case new_session_ticket: uint32 max_early_data_size;
**
*= https://tools.ietf.org/rfc/rfc8446#section-4.2.10
*# };
*# } EarlyDataIndication;
**/
static int s2n_nst_early_data_indication_send(struct s2n_connection *conn, struct s2n_stuffer *out)
{
uint32_t server_max_early_data = 0;
POSIX_GUARD_RESULT(s2n_early_data_get_server_max_size(conn, &server_max_early_data));
POSIX_GUARD(s2n_stuffer_write_uint32(out, server_max_early_data));
return S2N_SUCCESS;
}
static int s2n_nst_early_data_indiction_recv(struct s2n_connection *conn, struct s2n_stuffer *in)
{
POSIX_ENSURE_REF(conn);
uint32_t server_max_early_data = 0;
POSIX_GUARD(s2n_stuffer_read_uint32(in, &server_max_early_data));
POSIX_GUARD(s2n_connection_set_server_max_early_data_size(conn, server_max_early_data));
return S2N_SUCCESS;
}
static int s2n_nst_early_data_indication_missing(struct s2n_connection *conn)
{
POSIX_GUARD(s2n_connection_set_server_max_early_data_size(conn, 0));
return S2N_SUCCESS;
}
const s2n_extension_type s2n_nst_early_data_indication_extension = {
.iana_value = TLS_EXTENSION_EARLY_DATA,
.is_response = false,
.send = s2n_nst_early_data_indication_send,
.recv = s2n_nst_early_data_indiction_recv,
.should_send = s2n_nst_early_data_indication_should_send,
.if_missing = s2n_nst_early_data_indication_missing,
};
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