SSL_CTX_set_timeout, SSL_CTX_get_timeout - manipulate timeout values for session
caching
#include <openssl/ssl.h>
long SSL_CTX_set_timeout(SSL_CTX *ctx, long t);
long SSL_CTX_get_timeout(SSL_CTX *ctx);
SSL_CTX_set_timeout() sets the timeout for newly created sessions for
ctx to
t. The timeout value
t must be given in seconds.
SSL_CTX_get_timeout() returns the currently set timeout value for
ctx.
Whenever a new session is created, it is assigned a maximum lifetime. This
lifetime is specified by storing the creation time of the session and the
timeout value valid at this time. If the actual time is later than creation
time plus timeout, the session is not reused.
Due to this realization, all sessions behave according to the timeout value
valid at the time of the session negotiation. Changes of the timeout value do
not affect already established sessions.
The expiration time of a single session can be modified using the
SSL_SESSION_get_time(3) family of functions.
Expired sessions are removed from the internal session cache, whenever
SSL_CTX_flush_sessions(3) is called, either directly by the application
or automatically (see
SSL_CTX_set_session_cache_mode(3))
The default value for session timeout is decided on a per protocol basis, see
SSL_get_default_timeout(3). All currently supported protocols have the
same default timeout value of 300 seconds.
This timeout value is used as the ticket lifetime hint for stateless session
tickets. It is also used as the timeout value within the ticket itself.
For TLSv1.3, RFC8446 limits transmission of this value to 1 week (604800
seconds).
For TLSv1.2, tickets generated during an initial handshake use the value as
specified. Tickets generated during a resumed handshake have a value of 0 for
the ticket lifetime hint.
SSL_CTX_set_timeout() returns the previously set timeout value.
SSL_CTX_get_timeout() returns the currently set timeout value.
ssl(7),
SSL_CTX_set_session_cache_mode(3),
SSL_SESSION_get_time(3),
SSL_CTX_flush_sessions(3),
SSL_get_default_timeout(3)
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Licensed under the Apache License 2.0 (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>.