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124 .\" ========================================================================
126 .IX Title "SSL_CTX_set_session_id_context 3"
127 .TH SSL_CTX_set_session_id_context 3 "2014-01-06" "1.0.1f" "OpenSSL"
128 .\" For nroff, turn off justification. Always turn off hyphenation; it makes
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133 SSL_CTX_set_session_id_context, SSL_set_session_id_context \- set context within which session can be reused (server side only)
135 .IX Header "SYNOPSIS"
137 \& #include <openssl/ssl.h>
139 \& int SSL_CTX_set_session_id_context(SSL_CTX *ctx, const unsigned char *sid_ctx,
140 \& unsigned int sid_ctx_len);
141 \& int SSL_set_session_id_context(SSL *ssl, const unsigned char *sid_ctx,
142 \& unsigned int sid_ctx_len);
145 .IX Header "DESCRIPTION"
146 \&\fISSL_CTX_set_session_id_context()\fR sets the context \fBsid_ctx\fR of length
147 \&\fBsid_ctx_len\fR within which a session can be reused for the \fBctx\fR object.
149 \&\fISSL_set_session_id_context()\fR sets the context \fBsid_ctx\fR of length
150 \&\fBsid_ctx_len\fR within which a session can be reused for the \fBssl\fR object.
153 Sessions are generated within a certain context. When exporting/importing
154 sessions with \fBi2d_SSL_SESSION\fR/\fBd2i_SSL_SESSION\fR it would be possible,
155 to re-import a session generated from another context (e.g. another
156 application), which might lead to malfunctions. Therefore each application
157 must set its own session id context \fBsid_ctx\fR which is used to distinguish
158 the contexts and is stored in exported sessions. The \fBsid_ctx\fR can be
159 any kind of binary data with a given length, it is therefore possible
160 to use e.g. the name of the application and/or the hostname and/or service
163 The session id context becomes part of the session. The session id context
164 is set by the \s-1SSL/TLS\s0 server. The \fISSL_CTX_set_session_id_context()\fR and
165 \&\fISSL_set_session_id_context()\fR functions are therefore only useful on the
168 OpenSSL clients will check the session id context returned by the server
169 when reusing a session.
171 The maximum length of the \fBsid_ctx\fR is limited to
172 \&\fB\s-1SSL_MAX_SSL_SESSION_ID_LENGTH\s0\fR.
174 .IX Header "WARNINGS"
175 If the session id context is not set on an \s-1SSL/TLS\s0 server and client
176 certificates are used, stored sessions
177 will not be reused but a fatal error will be flagged and the handshake
180 If a server returns a different session id context to an OpenSSL client
181 when reusing a session, an error will be flagged and the handshake will
182 fail. OpenSSL servers will always return the correct session id context,
183 as an OpenSSL server checks the session id context itself before reusing
184 a session as described above.
186 .IX Header "RETURN VALUES"
187 \&\fISSL_CTX_set_session_id_context()\fR and \fISSL_set_session_id_context()\fR
188 return the following values:
190 The length \fBsid_ctx_len\fR of the session id context \fBsid_ctx\fR exceeded
191 the maximum allowed length of \fB\s-1SSL_MAX_SSL_SESSION_ID_LENGTH\s0\fR. The error
192 is logged to the error stack.
195 The operation succeeded.
197 .IX Header "SEE ALSO"