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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 <sys/param.h>
#include <s2n.h>
#include <time.h>
#include "error/s2n_errno.h"
#include "tls/s2n_connection.h"
#include "tls/s2n_alerts.h"
#include "tls/s2n_tls.h"
#include "tls/s2n_resume.h"
#include "stuffer/s2n_stuffer.h"
#include "utils/s2n_safety.h"
#include "utils/s2n_random.h"
int s2n_server_nst_recv(struct s2n_connection *conn) {
GUARD(s2n_stuffer_read_uint32(&conn->handshake.io, &conn->ticket_lifetime_hint));
uint16_t session_ticket_len;
GUARD(s2n_stuffer_read_uint16(&conn->handshake.io, &session_ticket_len));
if (session_ticket_len > 0) {
GUARD(s2n_realloc(&conn->client_ticket, session_ticket_len));
GUARD(s2n_stuffer_read(&conn->handshake.io, &conn->client_ticket));
}
return 0;
}
int s2n_server_nst_send(struct s2n_connection *conn)
{
uint16_t session_ticket_len = S2N_TICKET_SIZE_IN_BYTES;
uint8_t data[S2N_TICKET_SIZE_IN_BYTES];
struct s2n_blob entry = { .data = data, .size = sizeof(data) };
struct s2n_stuffer to;
uint32_t lifetime_hint_in_secs = (conn->config->encrypt_decrypt_key_lifetime_in_nanos + conn->config->decrypt_key_lifetime_in_nanos) / ONE_SEC_IN_NANOS;
/* When server changes it's mind mid handshake send lifetime hint and session ticket length as zero */
if (!conn->config->use_tickets) {
GUARD(s2n_stuffer_write_uint32(&conn->handshake.io, 0));
GUARD(s2n_stuffer_write_uint16(&conn->handshake.io, 0));
return 0;
}
if (!s2n_server_sending_nst(conn)) {
S2N_ERROR(S2N_ERR_SENDING_NST);
}
GUARD(s2n_stuffer_init(&to, &entry));
GUARD(s2n_stuffer_write_uint32(&conn->handshake.io, lifetime_hint_in_secs));
GUARD(s2n_stuffer_write_uint16(&conn->handshake.io, session_ticket_len));
GUARD(s2n_encrypt_session_ticket(conn, &to));
GUARD(s2n_stuffer_write(&conn->handshake.io, &to.blob));
return 0;
}
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