1SSL_CTX_SET_NUM_TICKETS(3)          OpenSSL         SSL_CTX_SET_NUM_TICKETS(3)
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NAME

6       SSL_set_num_tickets, SSL_get_num_tickets, SSL_CTX_set_num_tickets,
7       SSL_CTX_get_num_tickets - control the number of TLSv1.3 session tickets
8       that are issued
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SYNOPSIS

11        #include <openssl/ssl.h>
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13        int SSL_set_num_tickets(SSL *s, size_t num_tickets);
14        size_t SSL_get_num_tickets(SSL *s);
15        int SSL_CTX_set_num_tickets(SSL_CTX *ctx, size_t num_tickets);
16        size_t SSL_CTX_get_num_tickets(SSL_CTX *ctx);
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DESCRIPTION

19       SSL_CTX_set_num_tickets() and SSL_set_num_tickets() can be called for a
20       server application and set the number of TLSv1.3 session tickets that
21       will be sent to the client after a full handshake. Set the desired
22       value (which could be 0) in the num_tickets argument. Typically these
23       functions should be called before the start of the handshake.
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25       The default number of tickets is 2; the default number of tickets sent
26       following a resumption handshake is 1 but this cannot be changed using
27       these functions.  The number of tickets following a resumption
28       handshake can be reduced to 0 using custom session ticket callbacks
29       (see SSL_CTX_set_session_ticket_cb(3)).
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31       Tickets are also issued on receipt of a post-handshake certificate from
32       the client following a request by the server using
33       SSL_verify_client_post_handshake(3). These new tickets will be
34       associated with the updated client identity (i.e. including their
35       certificate and verification status). The number of tickets issued will
36       normally be the same as was used for the initial handshake. If the
37       initial handshake was a full handshake then SSL_set_num_tickets() can
38       be called again prior to calling SSL_verify_client_post_handshake() to
39       update the number of tickets that will be sent.
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41       SSL_CTX_get_num_tickets() and SSL_get_num_tickets() return the number
42       of tickets set by a previous call to SSL_CTX_set_num_tickets() or
43       SSL_set_num_tickets(), or 2 if no such call has been made.
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RETURN VALUES

46       SSL_CTX_set_num_tickets() and SSL_set_num_tickets() return 1 on success
47       or 0 on failure.
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49       SSL_CTX_get_num_tickets() and SSL_get_num_tickets() return the number
50       of tickets that have been previously set.
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HISTORY

53       These functions were added in OpenSSL 1.1.1.
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56       Copyright 2018 The OpenSSL Project Authors. All Rights Reserved.
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58       Licensed under the OpenSSL license (the "License").  You may not use
59       this file except in compliance with the License.  You can obtain a copy
60       in the file LICENSE in the source distribution or at
61       <https://www.openssl.org/source/license.html>.
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651.1.1d                            2019-10-03        SSL_CTX_SET_NUM_TICKETS(3)
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