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-.\"
-.\"     $OpenBSD: SSL_CTX_set_session_cache_mode.3,v 1.2 2014/12/02 14:11:01 jmc Exp $
-.\"
-.Dd $Mdocdate: December 2 2014 $
-.Dt SSL_CTX_SET_SESSION_CACHE_MODE 3
-.Os
-.Sh NAME
-.Nm SSL_CTX_set_session_cache_mode ,
-.Nm SSL_CTX_get_session_cache_mode
-.Nd enable/disable session caching
-.Sh SYNOPSIS
-.In openssl/ssl.h
-.Ft long
-.Fn SSL_CTX_set_session_cache_mode "SSL_CTX ctx" "long mode"
-.Ft long
-.Fn SSL_CTX_get_session_cache_mode "SSL_CTX ctx"
-.Sh DESCRIPTION
-.Fn SSL_CTX_set_session_cache_mode
-enables/disables session caching by setting the operational mode for
-.Ar ctx
-to
-.Ar mode .
-.Pp
-.Fn SSL_CTX_get_session_cache_mode
-returns the currently used cache mode.
-.Sh NOTES
-The OpenSSL library can store/retrieve SSL/TLS sessions for later reuse.
-The sessions can be held in memory for each
-.Fa ctx ,
-if more than one
-.Vt SSL_CTX
-object is being maintained, the sessions are unique for each
-.Vt SSL_CTX
-object.
-.Pp
-In order to reuse a session, a client must send the session's id to the server.
-It can only send exactly one id.
-The server then either agrees to reuse the session or it starts a full
-handshake (to create a new session).
-.Pp
-A server will lookup up the session in its internal session storage.
-If the session is not found in internal storage or lookups for the internal
-storage have been deactivated
-.Pq Dv SSL_SESS_CACHE_NO_INTERNAL_LOOKUP ,
-the server will try the external storage if available.
-.Pp
-Since a client may try to reuse a session intended for use in a different
-context, the session id context must be set by the server (see
-.Xr SSL_CTX_set_session_id_context 3 ) .
-.Pp
-The following session cache modes and modifiers are available:
-.Bl -tag -width Ds
-.It Dv SSL_SESS_CACHE_OFF
-No session caching for client or server takes place.
-.It Dv SSL_SESS_CACHE_CLIENT
-Client sessions are added to the session cache.
-As there is no reliable way for the OpenSSL library to know whether a session
-should be reused or which session to choose (due to the abstract BIO layer the
-SSL engine does not have details about the connection),
-the application must select the session to be reused by using the
-.Xr SSL_set_session 3
-function.
-This option is not activated by default.
-.It Dv SSL_SESS_CACHE_SERVER
-Server sessions are added to the session cache.
-When a client proposes a session to be reused, the server looks for the
-corresponding session in (first) the internal session cache (unless
-.Dv SSL_SESS_CACHE_NO_INTERNAL_LOOKUP
-is set), then (second) in the external cache if available.
-If the session is found, the server will try to reuse the session.
-This is the default.
-.It Dv SSL_SESS_CACHE_BOTH
-Enable both
-.Dv SSL_SESS_CACHE_CLIENT
-and
-.Dv SSL_SESS_CACHE_SERVER
-at the same time.
-.It Dv SSL_SESS_CACHE_NO_AUTO_CLEAR
-Normally the session cache is checked for expired sessions every 255
-connections using the
-.Xr SSL_CTX_flush_sessions 3
-function.
-Since this may lead to a delay which cannot be controlled,
-the automatic flushing may be disabled and
-.Xr SSL_CTX_flush_sessions 3
-can be called explicitly by the application.
-.It Dv SSL_SESS_CACHE_NO_INTERNAL_LOOKUP
-By setting this flag, session-resume operations in an SSL/TLS server will not
-automatically look up sessions in the internal cache,
-even if sessions are automatically stored there.
-If external session caching callbacks are in use,
-this flag guarantees that all lookups are directed to the external cache.
-As automatic lookup only applies for SSL/TLS servers,
-the flag has no effect on clients.
-.It Dv SSL_SESS_CACHE_NO_INTERNAL_STORE
-Depending on the presence of
-.Dv SSL_SESS_CACHE_CLIENT
-and/or
-.Dv SSL_SESS_CACHE_SERVER ,
-sessions negotiated in an SSL/TLS handshake may be cached for possible reuse.
-Normally a new session is added to the internal cache as well as any external
-session caching (callback) that is configured for the
-.Vt SSL_CTX .
-This flag will prevent sessions being stored in the internal cache
-(though the application can add them manually using
-.Xr SSL_CTX_add_session 3 ) .
-Note:
-in any SSL/TLS servers where external caching is configured, any successful
-session lookups in the external cache (e.g., for session-resume requests) would
-normally be copied into the local cache before processing continues \(en this
-flag prevents these additions to the internal cache as well.
-.It Dv SSL_SESS_CACHE_NO_INTERNAL
-Enable both
-.Dv SSL_SESS_CACHE_NO_INTERNAL_LOOKUP
-and
-.Dv SSL_SESS_CACHE_NO_INTERNAL_STORE
-at the same time.
-.El
-.Pp
-The default mode is
-.Dv SSL_SESS_CACHE_SERVER .
-.Sh RETURN VALUES
-.Fn SSL_CTX_set_session_cache_mode
-returns the previously set cache mode.
-.Pp
-.Fn SSL_CTX_get_session_cache_mode
-returns the currently set cache mode.
-.Sh SEE ALSO
-.Xr ssl 3 ,
-.Xr SSL_CTX_add_session 3 ,
-.Xr SSL_CTX_flush_sessions 3 ,
-.Xr SSL_CTX_sess_number 3 ,
-.Xr SSL_CTX_sess_set_cache_size 3 ,
-.Xr SSL_CTX_sess_set_get_cb 3 ,
-.Xr SSL_CTX_set_session_id_context 3 ,
-.Xr SSL_CTX_set_timeout 3 ,
-.Xr SSL_session_reused 3 ,
-.Xr SSL_set_session 3
-.Sh HISTORY
-.Dv SSL_SESS_CACHE_NO_INTERNAL_STORE
-and
-.Dv SSL_SESS_CACHE_NO_INTERNAL
-were introduced in OpenSSL 0.9.6h.