diff options
Diffstat (limited to 'secure/lib/libssl/man/SSL_CTX_set_session_cache_mode.3')
| -rw-r--r-- | secure/lib/libssl/man/SSL_CTX_set_session_cache_mode.3 | 254 |
1 files changed, 254 insertions, 0 deletions
diff --git a/secure/lib/libssl/man/SSL_CTX_set_session_cache_mode.3 b/secure/lib/libssl/man/SSL_CTX_set_session_cache_mode.3 new file mode 100644 index 0000000..1881c7e --- /dev/null +++ b/secure/lib/libssl/man/SSL_CTX_set_session_cache_mode.3 @@ -0,0 +1,254 @@ +.\" Automatically generated by Pod::Man 2.28 (Pod::Simple 3.28) +.\" +.\" Standard preamble: +.\" ======================================================================== +.de Sp \" Vertical space (when we can't use .PP) +.if t .sp .5v +.if n .sp +.. +.de Vb \" Begin verbatim text +.ft CW +.nf +.ne \\$1 +.. +.de Ve \" End verbatim text +.ft R +.fi +.. +.\" Set up some character translations and predefined strings. \*(-- will +.\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left +.\" double quote, and \*(R" will give a right double quote. \*(C+ will +.\" give a nicer C++. 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Always turn off hyphenation; it makes +.\" way too many mistakes in technical documents. +.if n .ad l +.nh +.SH "NAME" +SSL_CTX_set_session_cache_mode, SSL_CTX_get_session_cache_mode \- enable/disable session caching +.SH "SYNOPSIS" +.IX Header "SYNOPSIS" +.Vb 1 +\& #include <openssl/ssl.h> +\& +\& long SSL_CTX_set_session_cache_mode(SSL_CTX ctx, long mode); +\& long SSL_CTX_get_session_cache_mode(SSL_CTX ctx); +.Ve +.SH "DESCRIPTION" +.IX Header "DESCRIPTION" +\&\fISSL_CTX_set_session_cache_mode()\fR enables/disables session caching +by setting the operational mode for \fBctx\fR to <mode>. +.PP +\&\fISSL_CTX_get_session_cache_mode()\fR returns the currently used cache mode. +.SH "NOTES" +.IX Header "NOTES" +The OpenSSL library can store/retrieve \s-1SSL/TLS\s0 sessions for later reuse. +The sessions can be held in memory for each \fBctx\fR, if more than one +\&\s-1SSL_CTX\s0 object is being maintained, the sessions are unique for each \s-1SSL_CTX\s0 +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 (\s-1SSL_SESS_CACHE_NO_INTERNAL_LOOKUP\s0), 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 +\&\fISSL_CTX_set_session_id_context\fR\|(3)). +.PP +The following session cache modes and modifiers are available: +.IP "\s-1SSL_SESS_CACHE_OFF\s0" 4 +.IX Item "SSL_SESS_CACHE_OFF" +No session caching for client or server takes place. +.IP "\s-1SSL_SESS_CACHE_CLIENT\s0" 4 +.IX Item "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 \s-1BIO\s0 layer the \s-1SSL\s0 engine does not +have details about the connection), the application must select the session +to be reused by using the \fISSL_set_session\fR\|(3) +function. This option is not activated by default. +.IP "\s-1SSL_SESS_CACHE_SERVER\s0" 4 +.IX Item "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 \s-1SSL_SESS_CACHE_NO_INTERNAL_LOOKUP\s0 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. +.IP "\s-1SSL_SESS_CACHE_BOTH\s0" 4 +.IX Item "SSL_SESS_CACHE_BOTH" +Enable both \s-1SSL_SESS_CACHE_CLIENT\s0 and \s-1SSL_SESS_CACHE_SERVER\s0 at the same time. +.IP "\s-1SSL_SESS_CACHE_NO_AUTO_CLEAR\s0" 4 +.IX Item "SSL_SESS_CACHE_NO_AUTO_CLEAR" +Normally the session cache is checked for expired sessions every +255 connections using the +\&\fISSL_CTX_flush_sessions\fR\|(3) function. Since +this may lead to a delay which cannot be controlled, the automatic +flushing may be disabled and +\&\fISSL_CTX_flush_sessions\fR\|(3) can be called +explicitly by the application. +.IP "\s-1SSL_SESS_CACHE_NO_INTERNAL_LOOKUP\s0" 4 +.IX Item "SSL_SESS_CACHE_NO_INTERNAL_LOOKUP" +By setting this flag, session-resume operations in an \s-1SSL/TLS\s0 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 \s-1SSL/TLS\s0 servers, the flag has no effect on +clients. +.IP "\s-1SSL_SESS_CACHE_NO_INTERNAL_STORE\s0" 4 +.IX Item "SSL_SESS_CACHE_NO_INTERNAL_STORE" +Depending on the presence of \s-1SSL_SESS_CACHE_CLIENT\s0 and/or \s-1SSL_SESS_CACHE_SERVER,\s0 +sessions negotiated in an \s-1SSL/TLS\s0 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 \s-1SSL_CTX.\s0 This flag will +prevent sessions being stored in the internal cache (though the application can +add them manually using \fISSL_CTX_add_session\fR\|(3)). Note: +in any \s-1SSL/TLS\s0 servers where external caching is configured, any successful +session lookups in the external cache (ie. for session-resume requests) would +normally be copied into the local cache before processing continues \- this flag +prevents these additions to the internal cache as well. +.IP "\s-1SSL_SESS_CACHE_NO_INTERNAL\s0" 4 +.IX Item "SSL_SESS_CACHE_NO_INTERNAL" +Enable both \s-1SSL_SESS_CACHE_NO_INTERNAL_LOOKUP\s0 and +\&\s-1SSL_SESS_CACHE_NO_INTERNAL_STORE\s0 at the same time. +.PP +The default mode is \s-1SSL_SESS_CACHE_SERVER.\s0 +.SH "RETURN VALUES" +.IX Header "RETURN VALUES" +\&\fISSL_CTX_set_session_cache_mode()\fR returns the previously set cache mode. +.PP +\&\fISSL_CTX_get_session_cache_mode()\fR returns the currently set cache mode. +.SH "SEE ALSO" +.IX Header "SEE ALSO" +\&\fIssl\fR\|(3), \fISSL_set_session\fR\|(3), +\&\fISSL_session_reused\fR\|(3), +\&\fISSL_CTX_add_session\fR\|(3), +\&\fISSL_CTX_sess_number\fR\|(3), +\&\fISSL_CTX_sess_set_cache_size\fR\|(3), +\&\fISSL_CTX_sess_set_get_cb\fR\|(3), +\&\fISSL_CTX_set_session_id_context\fR\|(3), +\&\fISSL_CTX_set_timeout\fR\|(3), +\&\fISSL_CTX_flush_sessions\fR\|(3) +.SH "HISTORY" +.IX Header "HISTORY" +\&\s-1SSL_SESS_CACHE_NO_INTERNAL_STORE\s0 and \s-1SSL_SESS_CACHE_NO_INTERNAL\s0 +were introduced in OpenSSL 0.9.6h. |
