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/*
* Copyright 2020 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 <stdint.h>
#include <s2n.h>
#include "error/s2n_errno.h"
#include "stuffer/s2n_stuffer.h"
#include "tls/s2n_connection.h"
#include "tls/s2n_tls.h"
#include "utils/s2n_array.h"
/* Establishing a session requires reading the CLIENT_HELLO message and then generating security parameters.
*
* S2N supports resuming sessions under TLS1.2 if the client sends a session ID. The server can lookup a
* provided session ID in its cache. */
int s2n_establish_session(struct s2n_connection *conn)
{
GUARD(s2n_conn_set_handshake_read_block(conn));
/* Start by receiving and processing the entire CLIENT_HELLO message */
if (!conn->handshake.client_hello_received) {
GUARD(s2n_client_hello_recv(conn));
conn->handshake.client_hello_received = 1;
}
GUARD(s2n_conn_set_handshake_type(conn));
if (conn->client_hello_version != S2N_SSLv2)
{
/* We've selected the parameters for the handshake, update the required hashes for this connection */
GUARD(s2n_conn_update_required_handshake_hashes(conn));
}
GUARD(s2n_conn_clear_handshake_read_block(conn));
return 0;
}
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