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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_session_ticket.h"
#include <stdint.h>
#include <sys/param.h>
#include "tls/extensions/s2n_client_psk.h"
#include "tls/s2n_resume.h"
#include "tls/s2n_tls.h"
#include "tls/s2n_tls_parameters.h"
#include "utils/s2n_safety.h"
static bool s2n_client_session_ticket_should_send(struct s2n_connection *conn);
static int s2n_client_session_ticket_send(struct s2n_connection *conn, struct s2n_stuffer *out);
static int s2n_client_session_ticket_recv(struct s2n_connection *conn, struct s2n_stuffer *extension);
const s2n_extension_type s2n_client_session_ticket_extension = {
.iana_value = TLS_EXTENSION_SESSION_TICKET,
.is_response = false,
.send = s2n_client_session_ticket_send,
.recv = s2n_client_session_ticket_recv,
.should_send = s2n_client_session_ticket_should_send,
.if_missing = s2n_extension_noop_if_missing,
};
static bool s2n_client_session_ticket_should_send(struct s2n_connection *conn)
{
return conn->config->use_tickets && !s2n_client_psk_should_send(conn);
}
static int s2n_client_session_ticket_send(struct s2n_connection *conn, struct s2n_stuffer *out)
{
POSIX_GUARD(s2n_stuffer_write(out, &conn->client_ticket));
return S2N_SUCCESS;
}
static int s2n_client_session_ticket_recv(struct s2n_connection *conn, struct s2n_stuffer *extension)
{
if (conn->config->use_tickets != 1 || conn->actual_protocol_version > S2N_TLS12) {
/* Ignore the extension. */
return S2N_SUCCESS;
}
/* s2n server does not support session ticket with CLIENT_AUTH enabled */
if (s2n_connection_is_client_auth_enabled(conn) > 0) {
return S2N_SUCCESS;
}
if (s2n_stuffer_data_available(extension) == S2N_TLS12_TICKET_SIZE_IN_BYTES) {
conn->session_ticket_status = S2N_DECRYPT_TICKET;
POSIX_GUARD(s2n_stuffer_copy(extension, &conn->client_ticket_to_decrypt, S2N_TLS12_TICKET_SIZE_IN_BYTES));
} else if (s2n_config_is_encrypt_decrypt_key_available(conn->config) == 1) {
conn->session_ticket_status = S2N_NEW_TICKET;
}
return S2N_SUCCESS;
}
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