SSL_CTX_SET_NUM_TICKETS - Online Linux Manual PageSection : 3
Updated : 2021-03-26
Source : 1.1.1k
Note : OpenSSL
NAMESSL_set_num_tickets, SSL_get_num_tickets, SSL_CTX_set_num_tickets, SSL_CTX_get_num_tickets ​− control the number of TLSv1.3 session tickets that are issued
SYNOPSIS​ #include <openssl/ssl.h> ​ ​ int SSL_set_num_tickets(SSL *s, size_t num_tickets); ​ size_t SSL_get_num_tickets(SSL *s); ​ int SSL_CTX_set_num_tickets(SSL_CTX *ctx, size_t num_tickets); ​ size_t SSL_CTX_get_num_tickets(SSL_CTX *ctx);
DESCRIPTION​SSL_CTX_set_num_tickets() and SSL_set_num_tickets() can be called for a server application and set the number of TLSv1.3 session tickets that will be sent to the client after a full handshake. Set the desired value (which could be 0) in the num_tickets argument. Typically these functions should be called before the start of the handshake. The default number of tickets is 2; the default number of tickets sent following a resumption handshake is 1 but this cannot be changed using these functions. The number of tickets following a resumption handshake can be reduced to 0 using custom session ticket callbacks (see SSL_CTX_set_session_ticket_cb (3)). Tickets are also issued on receipt of a post-handshake certificate from the client following a request by the server using ​SSL_verify_client_post_handshake (3). These new tickets will be associated with the updated client identity (i.e. including their certificate and verification status). The number of tickets issued will normally be the same as was used for the initial handshake. If the initial handshake was a full handshake then SSL_set_num_tickets() can be called again prior to calling ​SSL_verify_client_post_handshake() to update the number of tickets that will be sent. ​SSL_CTX_get_num_tickets() and SSL_get_num_tickets() return the number of tickets set by a previous call to SSL_CTX_set_num_tickets() or ​SSL_set_num_tickets(), or 2 if no such call has been made.
RETURN VALUES​SSL_CTX_set_num_tickets() and SSL_set_num_tickets() return 1 on success or 0 on failure. ​SSL_CTX_get_num_tickets() and SSL_get_num_tickets() return the number of tickets that have been previously set.
HISTORYThese functions were added in OpenSSL 1.1.1.
COPYRIGHTCopyright 2018 The OpenSSL Project Authors. All Rights Reserved. Licensed under the OpenSSL license (the ‟License”). You may not use this file except in compliance with the License. You can obtain a copy in the file LICENSE in the source distribution or at <https://www.openssl.org/source/license.html>. 0
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