1SSL_CTX_SET_TIMEOUT(3ossl)          OpenSSL         SSL_CTX_SET_TIMEOUT(3ossl)
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NAME

6       SSL_CTX_set_timeout, SSL_CTX_get_timeout - manipulate timeout values
7       for session caching
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SYNOPSIS

10        #include <openssl/ssl.h>
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12        long SSL_CTX_set_timeout(SSL_CTX *ctx, long t);
13        long SSL_CTX_get_timeout(SSL_CTX *ctx);
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DESCRIPTION

16       SSL_CTX_set_timeout() sets the timeout for newly created sessions for
17       ctx to t. The timeout value t must be given in seconds.
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19       SSL_CTX_get_timeout() returns the currently set timeout value for ctx.
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NOTES

22       Whenever a new session is created, it is assigned a maximum lifetime.
23       This lifetime is specified by storing the creation time of the session
24       and the timeout value valid at this time. If the actual time is later
25       than creation time plus timeout, the session is not reused.
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27       Due to this realization, all sessions behave according to the timeout
28       value valid at the time of the session negotiation. Changes of the
29       timeout value do not affect already established sessions.
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31       The expiration time of a single session can be modified using the
32       SSL_SESSION_get_time(3) family of functions.
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34       Expired sessions are removed from the internal session cache, whenever
35       SSL_CTX_flush_sessions(3) is called, either directly by the application
36       or automatically (see SSL_CTX_set_session_cache_mode(3))
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38       The default value for session timeout is decided on a per protocol
39       basis, see SSL_get_default_timeout(3).  All currently supported
40       protocols have the same default timeout value of 300 seconds.
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42       This timeout value is used as the ticket lifetime hint for stateless
43       session tickets. It is also used as the timeout value within the ticket
44       itself.
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46       For TLSv1.3, RFC8446 limits transmission of this value to 1 week
47       (604800 seconds).
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49       For TLSv1.2, tickets generated during an initial handshake use the
50       value as specified. Tickets generated during a resumed handshake have a
51       value of 0 for the ticket lifetime hint.
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RETURN VALUES

54       SSL_CTX_set_timeout() returns the previously set timeout value.
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56       SSL_CTX_get_timeout() returns the currently set timeout value.
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SEE ALSO

59       ssl(7), SSL_CTX_set_session_cache_mode(3), SSL_SESSION_get_time(3),
60       SSL_CTX_flush_sessions(3), SSL_get_default_timeout(3)
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63       Copyright 2001-2022 The OpenSSL Project Authors. All Rights Reserved.
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65       Licensed under the Apache License 2.0 (the "License").  You may not use
66       this file except in compliance with the License.  You can obtain a copy
67       in the file LICENSE in the source distribution or at
68       <https://www.openssl.org/source/license.html>.
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723.1.1                             2023-08-31        SSL_CTX_SET_TIMEOUT(3ossl)
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