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80.\" If the F register is turned on, we'll generate
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96.TH SSL_CTX_set_session_id_context 3 "0.9.7d" "2/Sep/2004" "OpenSSL"
97.UC
98.if n .hy 0
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188.\}
189.rm #[ #] #H #V #F C
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190.SH "NAME"
191SSL_CTX_set_session_id_context, SSL_set_session_id_context \- set context within which session can be reused (server side only)
192.SH "SYNOPSIS"
a7d27d5a 193.PP
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194.Vb 1
195\& #include <openssl/ssl.h>
196.Ve
197.Vb 4
198\& int SSL_CTX_set_session_id_context(SSL_CTX *ctx, const unsigned char *sid_ctx,
199\& unsigned int sid_ctx_len);
200\& int SSL_set_session_id_context(SSL *ssl, const unsigned char *sid_ctx,
201\& unsigned int sid_ctx_len);
202.Ve
203.SH "DESCRIPTION"
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204\fISSL_CTX_set_session_id_context()\fR sets the context \fBsid_ctx\fR of length
205\fBsid_ctx_len\fR within which a session can be reused for the \fBctx\fR object.
984263bc 206.PP
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207\fISSL_set_session_id_context()\fR sets the context \fBsid_ctx\fR of length
208\fBsid_ctx_len\fR within which a session can be reused for the \fBssl\fR object.
984263bc 209.SH "NOTES"
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210Sessions are generated within a certain context. When exporting/importing
211sessions with \fBi2d_SSL_SESSION\fR/\fBd2i_SSL_SESSION\fR it would be possible,
212to re-import a session generated from another context (e.g. another
213application), which might lead to malfunctions. Therefore each application
214must set its own session id context \fBsid_ctx\fR which is used to distinguish
215the contexts and is stored in exported sessions. The \fBsid_ctx\fR can be
216any kind of binary data with a given length, it is therefore possible
217to use e.g. the name of the application and/or the hostname and/or service
218name ...
219.PP
220The session id context becomes part of the session. The session id context
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221is set by the SSL/TLS server. The \fISSL_CTX_set_session_id_context()\fR and
222\fISSL_set_session_id_context()\fR functions are therefore only useful on the
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223server side.
224.PP
225OpenSSL clients will check the session id context returned by the server
226when reusing a session.
227.PP
228The maximum length of the \fBsid_ctx\fR is limited to
a7d27d5a 229\fBSSL_MAX_SSL_SESSION_ID_LENGTH\fR.
984263bc 230.SH "WARNINGS"
a7d27d5a 231If the session id context is not set on an SSL/TLS server, stored sessions
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232will not be reused but a fatal error will be flagged and the handshake
233will fail.
234.PP
235If a server returns a different session id context to an OpenSSL client
236when reusing a session, an error will be flagged and the handshake will
237fail. OpenSSL servers will always return the correct session id context,
238as an OpenSSL server checks the session id context itself before reusing
239a session as described above.
240.SH "RETURN VALUES"
a7d27d5a 241\fISSL_CTX_set_session_id_context()\fR and \fISSL_set_session_id_context()\fR
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242return the following values:
243.Ip "0" 4
244The length \fBsid_ctx_len\fR of the session id context \fBsid_ctx\fR exceeded
245the maximum allowed length of \fB\s-1SSL_MAX_SSL_SESSION_ID_LENGTH\s0\fR. The error
246is logged to the error stack.
247.Ip "1" 4
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248The operation succeeded.
249.SH "SEE ALSO"
984263bc 250ssl(3)
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251
252.rn }` ''
253.IX Title "SSL_CTX_set_session_id_context 3"
254.IX Name "SSL_CTX_set_session_id_context, SSL_set_session_id_context - set context within which session can be reused (server side only)"
255
256.IX Header "NAME"
257
258.IX Header "SYNOPSIS"
259
260.IX Header "DESCRIPTION"
261
262.IX Header "NOTES"
263
264.IX Header "WARNINGS"
265
266.IX Header "RETURN VALUES"
267
268.IX Item "0"
269
270.IX Item "1"
271
272.IX Header "SEE ALSO"
273