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79 lines
2.5 KiB
Plaintext
79 lines
2.5 KiB
Plaintext
=pod
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=head1 NAME
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SSL_CTX_set_timeout, SSL_CTX_get_timeout - manipulate timeout values for session caching
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=head1 SYNOPSIS
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#include <openssl/ssl.h>
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long SSL_CTX_set_timeout(SSL_CTX *ctx, long t);
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long SSL_CTX_get_timeout(SSL_CTX *ctx);
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=head1 DESCRIPTION
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SSL_CTX_set_timeout() sets the timeout for newly created sessions for
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B<ctx> to B<t>. The timeout value B<t> must be given in seconds.
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SSL_CTX_get_timeout() returns the currently set timeout value for B<ctx>.
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=head1 NOTES
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Whenever a new session is created, it is assigned a maximum lifetime. This
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lifetime is specified by storing the creation time of the session and the
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timeout value valid at this time. If the actual time is later than creation
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time plus timeout, the session is not reused.
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Due to this realization, all sessions behave according to the timeout value
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valid at the time of the session negotiation. Changes of the timeout value
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do not affect already established sessions.
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The expiration time of a single session can be modified using the
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L<SSL_SESSION_get_time(3)> family of functions.
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Expired sessions are removed from the internal session cache, whenever
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L<SSL_CTX_flush_sessions(3)> is called, either
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directly by the application or automatically (see
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L<SSL_CTX_set_session_cache_mode(3)>)
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The default value for session timeout is decided on a per protocol
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basis, see L<SSL_get_default_timeout(3)>.
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All currently supported protocols have the same default timeout value
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of 300 seconds.
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This timeout value is used as the ticket lifetime hint for stateless session
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tickets. It is also used as the timeout value within the ticket itself.
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For TLSv1.3, RFC8446 limits transmission of this value to 1 week (604800
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seconds).
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For TLSv1.2, tickets generated during an initial handshake use the value
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as specified. Tickets generated during a resumed handshake have a value
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of 0 for the ticket lifetime hint.
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=head1 RETURN VALUES
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SSL_CTX_set_timeout() returns the previously set timeout value.
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SSL_CTX_get_timeout() returns the currently set timeout value.
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=head1 SEE ALSO
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L<ssl(7)>,
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L<SSL_CTX_set_session_cache_mode(3)>,
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L<SSL_SESSION_get_time(3)>,
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L<SSL_CTX_flush_sessions(3)>,
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L<SSL_get_default_timeout(3)>
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=head1 COPYRIGHT
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Copyright 2001-2022 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the Apache License 2.0 (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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