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| 124 | .\" ======================================================================== |
| 125 | .\" |
| 126 | .IX Title "SSL_CTX_sess_set_get_cb 3" |
| 127 | .TH SSL_CTX_sess_set_get_cb 3 "2012-01-04" "1.0.0f" "OpenSSL" |
| 128 | .\" For nroff, turn off justification. Always turn off hyphenation; it makes |
| 129 | .\" way too many mistakes in technical documents. |
| 130 | .if n .ad l |
| 131 | .nh |
| 132 | .SH "NAME" |
| 133 | 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 |
| 134 | .SH "SYNOPSIS" |
| 135 | .IX Header "SYNOPSIS" |
| 136 | .Vb 1 |
| 137 | \& #include <openssl/ssl.h> |
| 138 | \& |
| 139 | \& void SSL_CTX_sess_set_new_cb(SSL_CTX *ctx, |
| 140 | \& int (*new_session_cb)(SSL *, SSL_SESSION *)); |
| 141 | \& void SSL_CTX_sess_set_remove_cb(SSL_CTX *ctx, |
| 142 | \& void (*remove_session_cb)(SSL_CTX *ctx, SSL_SESSION *)); |
| 143 | \& void SSL_CTX_sess_set_get_cb(SSL_CTX *ctx, |
| 144 | \& SSL_SESSION (*get_session_cb)(SSL *, unsigned char *, int, int *)); |
| 145 | \& |
| 146 | \& int (*SSL_CTX_sess_get_new_cb(SSL_CTX *ctx))(struct ssl_st *ssl, SSL_SESSION *sess); |
| 147 | \& void (*SSL_CTX_sess_get_remove_cb(SSL_CTX *ctx))(struct ssl_ctx_st *ctx, SSL_SESSION *sess); |
| 148 | \& SSL_SESSION *(*SSL_CTX_sess_get_get_cb(SSL_CTX *ctx))(struct ssl_st *ssl, unsigned char *data, int len, int *copy); |
| 149 | \& |
| 150 | \& int (*new_session_cb)(struct ssl_st *ssl, SSL_SESSION *sess); |
| 151 | \& void (*remove_session_cb)(struct ssl_ctx_st *ctx, SSL_SESSION *sess); |
| 152 | \& SSL_SESSION *(*get_session_cb)(struct ssl_st *ssl, unsigned char *data, |
| 153 | \& int len, int *copy); |
| 154 | .Ve |
| 155 | .SH "DESCRIPTION" |
| 156 | .IX Header "DESCRIPTION" |
| 157 | \&\fISSL_CTX_sess_set_new_cb()\fR sets the callback function, which is automatically |
| 158 | called whenever a new session was negotiated. |
| 159 | .PP |
| 160 | \&\fISSL_CTX_sess_set_remove_cb()\fR sets the callback function, which is |
| 161 | automatically called whenever a session is removed by the \s-1SSL\s0 engine, |
| 162 | because it is considered faulty or the session has become obsolete because |
| 163 | of exceeding the timeout value. |
| 164 | .PP |
| 165 | \&\fISSL_CTX_sess_set_get_cb()\fR sets the callback function which is called, |
| 166 | whenever a \s-1SSL/TLS\s0 client proposed to resume a session but the session |
| 167 | could not be found in the internal session cache (see |
| 168 | \&\fISSL_CTX_set_session_cache_mode\fR\|(3)). |
| 169 | (\s-1SSL/TLS\s0 server only.) |
| 170 | .PP |
| 171 | \&\fISSL_CTX_sess_get_new_cb()\fR, \fISSL_CTX_sess_get_remove_cb()\fR, and |
| 172 | \&\fISSL_CTX_sess_get_get_cb()\fR allow to retrieve the function pointers of the |
| 173 | provided callback functions. If a callback function has not been set, |
| 174 | the \s-1NULL\s0 pointer is returned. |
| 175 | .SH "NOTES" |
| 176 | .IX Header "NOTES" |
| 177 | In order to allow external session caching, synchronization with the internal |
| 178 | session cache is realized via callback functions. Inside these callback |
| 179 | functions, session can be saved to disk or put into a database using the |
| 180 | \&\fId2i_SSL_SESSION\fR\|(3) interface. |
| 181 | .PP |
| 182 | The \fInew_session_cb()\fR is called, whenever a new session has been negotiated |
| 183 | and session caching is enabled (see |
| 184 | \&\fISSL_CTX_set_session_cache_mode\fR\|(3)). |
| 185 | The \fInew_session_cb()\fR is passed the \fBssl\fR connection and the ssl session |
| 186 | \&\fBsess\fR. If the callback returns \fB0\fR, the session will be immediately |
| 187 | removed again. |
| 188 | .PP |
| 189 | The \fIremove_session_cb()\fR is called, whenever the \s-1SSL\s0 engine removes a session |
| 190 | from the internal cache. This happens when the session is removed because |
| 191 | it is expired or when a connection was not shutdown cleanly. It also happens |
| 192 | for all sessions in the internal session cache when |
| 193 | \&\fISSL_CTX_free\fR\|(3) is called. The \fIremove_session_cb()\fR is passed |
| 194 | the \fBctx\fR and the ssl session \fBsess\fR. It does not provide any feedback. |
| 195 | .PP |
| 196 | The \fIget_session_cb()\fR is only called on \s-1SSL/TLS\s0 servers with the session id |
| 197 | proposed by the client. The \fIget_session_cb()\fR is always called, also when |
| 198 | session caching was disabled. The \fIget_session_cb()\fR is passed the |
| 199 | \&\fBssl\fR connection, the session id of length \fBlength\fR at the memory location |
| 200 | \&\fBdata\fR. With the parameter \fBcopy\fR the callback can require the |
| 201 | \&\s-1SSL\s0 engine to increment the reference count of the \s-1SSL_SESSION\s0 object, |
| 202 | Normally the reference count is not incremented and therefore the |
| 203 | session must not be explicitly freed with |
| 204 | \&\fISSL_SESSION_free\fR\|(3). |
| 205 | .SH "SEE ALSO" |
| 206 | .IX Header "SEE ALSO" |
| 207 | \&\fIssl\fR\|(3), \fId2i_SSL_SESSION\fR\|(3), |
| 208 | \&\fISSL_CTX_set_session_cache_mode\fR\|(3), |
| 209 | \&\fISSL_CTX_flush_sessions\fR\|(3), |
| 210 | \&\fISSL_SESSION_free\fR\|(3), |
| 211 | \&\fISSL_CTX_free\fR\|(3) |