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Diffstat (limited to 'secure/lib/libcrypto/man/SSL_CTX_sess_set_get_cb.3')
| -rw-r--r-- | secure/lib/libcrypto/man/SSL_CTX_sess_set_get_cb.3 | 241 |
1 files changed, 241 insertions, 0 deletions
diff --git a/secure/lib/libcrypto/man/SSL_CTX_sess_set_get_cb.3 b/secure/lib/libcrypto/man/SSL_CTX_sess_set_get_cb.3 new file mode 100644 index 000000000000..d316e9dbd1b0 --- /dev/null +++ b/secure/lib/libcrypto/man/SSL_CTX_sess_set_get_cb.3 @@ -0,0 +1,241 @@ +.\" Automatically generated by Pod::Man 4.09 (Pod::Simple 3.35) +.\" +.\" 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_sess_set_new_cb, SSL_CTX_sess_set_remove_cb, SSL_CTX_sess_set_get_cb, SSL_CTX_sess_get_new_cb, SSL_CTX_sess_get_remove_cb, SSL_CTX_sess_get_get_cb \- provide callback functions for server side external session caching +.SH "SYNOPSIS" +.IX Header "SYNOPSIS" +.Vb 1 +\& #include <openssl/ssl.h> +\& +\& void SSL_CTX_sess_set_new_cb(SSL_CTX *ctx, +\& int (*new_session_cb)(SSL *, SSL_SESSION *)); +\& void SSL_CTX_sess_set_remove_cb(SSL_CTX *ctx, +\& void (*remove_session_cb)(SSL_CTX *ctx, +\& SSL_SESSION *)); +\& void SSL_CTX_sess_set_get_cb(SSL_CTX *ctx, +\& SSL_SESSION (*get_session_cb)(SSL *, +\& const unsigned char *, +\& int, int *)); +\& +\& int (*SSL_CTX_sess_get_new_cb(SSL_CTX *ctx))(struct ssl_st *ssl, +\& SSL_SESSION *sess); +\& void (*SSL_CTX_sess_get_remove_cb(SSL_CTX *ctx))(struct ssl_ctx_st *ctx, +\& SSL_SESSION *sess); +\& SSL_SESSION *(*SSL_CTX_sess_get_get_cb(SSL_CTX *ctx))(struct ssl_st *ssl, +\& const unsigned char *data, +\& int len, int *copy); +.Ve +.SH "DESCRIPTION" +.IX Header "DESCRIPTION" +\&\fISSL_CTX_sess_set_new_cb()\fR sets the callback function, which is automatically +called whenever a new session was negotiated. +.PP +\&\fISSL_CTX_sess_set_remove_cb()\fR sets the callback function, which is +automatically called whenever a session is removed by the \s-1SSL\s0 engine, +because it is considered faulty or the session has become obsolete because +of exceeding the timeout value. +.PP +\&\fISSL_CTX_sess_set_get_cb()\fR sets the callback function which is called, +whenever a \s-1SSL/TLS\s0 client proposed to resume a session but the session +could not be found in the internal session cache (see +\&\fISSL_CTX_set_session_cache_mode\fR\|(3)). +(\s-1SSL/TLS\s0 server only.) +.PP +\&\fISSL_CTX_sess_get_new_cb()\fR, \fISSL_CTX_sess_get_remove_cb()\fR, and +\&\fISSL_CTX_sess_get_get_cb()\fR retrieve the function pointers set by the +corresponding set callback functions. If a callback function has not been +set, the \s-1NULL\s0 pointer is returned. +.SH "NOTES" +.IX Header "NOTES" +In order to allow external session caching, synchronization with the internal +session cache is realized via callback functions. Inside these callback +functions, session can be saved to disk or put into a database using the +\&\fId2i_SSL_SESSION\fR\|(3) interface. +.PP +The \fInew_session_cb()\fR is called, whenever a new session has been negotiated +and session caching is enabled (see +\&\fISSL_CTX_set_session_cache_mode\fR\|(3)). +The \fInew_session_cb()\fR is passed the \fBssl\fR connection and the ssl session +\&\fBsess\fR. If the callback returns \fB0\fR, the session will be immediately +removed again. Note that in TLSv1.3, sessions are established after the main +handshake has completed. The server decides when to send the client the session +information and this may occur some time after the end of the handshake (or not +at all). This means that applications should expect the \fInew_session_cb()\fR +function to be invoked during the handshake (for <= TLSv1.2) or after the +handshake (for TLSv1.3). It is also possible in TLSv1.3 for multiple sessions to +be established with a single connection. In these case the \fInew_session_cb()\fR +function will be invoked multiple times. +.PP +In TLSv1.3 it is recommended that each \s-1SSL_SESSION\s0 object is only used for +resumption once. One way of enforcing that is for applications to call +\&\fISSL_CTX_remove_session\fR\|(3) after a session has been used. +.PP +The \fIremove_session_cb()\fR is called, whenever the \s-1SSL\s0 engine removes a session +from the internal cache. This happens when the session is removed because +it is expired or when a connection was not shutdown cleanly. It also happens +for all sessions in the internal session cache when +\&\fISSL_CTX_free\fR\|(3) is called. The \fIremove_session_cb()\fR is passed +the \fBctx\fR and the ssl session \fBsess\fR. It does not provide any feedback. +.PP +The \fIget_session_cb()\fR is only called on \s-1SSL/TLS\s0 servers with the session id +proposed by the client. The \fIget_session_cb()\fR is always called, also when +session caching was disabled. The \fIget_session_cb()\fR is passed the +\&\fBssl\fR connection, the session id of length \fBlength\fR at the memory location +\&\fBdata\fR. With the parameter \fBcopy\fR the callback can require the +\&\s-1SSL\s0 engine to increment the reference count of the \s-1SSL_SESSION\s0 object, +Normally the reference count is not incremented and therefore the +session must not be explicitly freed with +\&\fISSL_SESSION_free\fR\|(3). +.SH "RETURN VALUES" +.IX Header "RETURN VALUES" +\&\fISSL_CTX_sess_get_new_cb()\fR, \fISSL_CTX_sess_get_remove_cb()\fR and \fISSL_CTX_sess_get_get_cb()\fR +return different callback function pointers respectively. +.SH "SEE ALSO" +.IX Header "SEE ALSO" +\&\fIssl\fR\|(7), \fId2i_SSL_SESSION\fR\|(3), +\&\fISSL_CTX_set_session_cache_mode\fR\|(3), +\&\fISSL_CTX_flush_sessions\fR\|(3), +\&\fISSL_SESSION_free\fR\|(3), +\&\fISSL_CTX_free\fR\|(3) +.SH "COPYRIGHT" +.IX Header "COPYRIGHT" +Copyright 2001\-2018 The OpenSSL Project Authors. All Rights Reserved. +.PP +Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use +this file except in compliance with the License. You can obtain a copy +in the file \s-1LICENSE\s0 in the source distribution or at +<https://www.openssl.org/source/license.html>. |