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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 "error/s2n_errno.h"
#include "tls/s2n_connection.h"
#include "tls/s2n_key_update.h"
#include "tls/s2n_tls.h"
#include "utils/s2n_safety.h"
/* TLS 1.3 introducted several post handshake messages. This function currently only
* supports parsing for the KeyUpdate message. Once the other post-handshake messages
* have been implemented, this function can be altered to include the other messages.
*/
int s2n_post_handshake_recv(struct s2n_connection *conn)
{
notnull_check(conn);
uint8_t post_handshake_id;
uint32_t message_length;
S2N_ERROR_IF(conn->actual_protocol_version != S2N_TLS13, S2N_ERR_BAD_MESSAGE);
GUARD(s2n_stuffer_read_uint8(&conn->in, &post_handshake_id));
GUARD(s2n_stuffer_read_uint24(&conn->in, &message_length));
struct s2n_blob post_handshake_blob = {0};
uint8_t *message_data = s2n_stuffer_raw_read(&conn->in, message_length);
notnull_check(message_data);
GUARD(s2n_blob_init(&post_handshake_blob, message_data, message_length));
struct s2n_stuffer post_handshake_stuffer = {0};
GUARD(s2n_stuffer_init(&post_handshake_stuffer, &post_handshake_blob));
GUARD(s2n_stuffer_skip_write(&post_handshake_stuffer, message_length));
switch (post_handshake_id)
{
case TLS_KEY_UPDATE:
GUARD(s2n_key_update_recv(conn, &post_handshake_stuffer));
break;
default:
/* Ignore all other messages */
break;
}
return S2N_SUCCESS;
}
int s2n_post_handshake_send(struct s2n_connection *conn, s2n_blocked_status *blocked)
{
notnull_check(conn);
GUARD(s2n_key_update_send(conn));
GUARD(s2n_flush(conn, blocked));
GUARD(s2n_stuffer_rewrite(&conn->out));
return S2N_SUCCESS;
}
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