206 lines
6.7 KiB
Groff
206 lines
6.7 KiB
Groff
.\" $NetBSD: SSL_CTX_set_session_id_context.3,v 1.12 2005/11/25 21:09:34 christos Exp $
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.\" ========================================================================
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.\"
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.IX Title "SSL_CTX_set_session_id_context 3"
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.TH SSL_CTX_set_session_id_context 3 "2005-03-25" "0.9.8a" "OpenSSL"
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.SH "NAME"
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SSL_CTX_set_session_id_context, SSL_set_session_id_context \- set context within which session can be reused (server side only)
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.SH "LIBRARY"
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libcrypto, -lcrypto
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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.Vb 1
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\& #include <openssl/ssl.h>
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.Ve
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.PP
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.Vb 4
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\& int SSL_CTX_set_session_id_context(SSL_CTX *ctx, const unsigned char *sid_ctx,
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\& unsigned int sid_ctx_len);
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\& int SSL_set_session_id_context(SSL *ssl, const unsigned char *sid_ctx,
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\& unsigned int sid_ctx_len);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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\&\fISSL_CTX_set_session_id_context()\fR sets the context \fBsid_ctx\fR of length
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\&\fBsid_ctx_len\fR within which a session can be reused for the \fBctx\fR object.
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.PP
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\&\fISSL_set_session_id_context()\fR sets the context \fBsid_ctx\fR of length
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\&\fBsid_ctx_len\fR within which a session can be reused for the \fBssl\fR object.
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.SH "NOTES"
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.IX Header "NOTES"
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Sessions are generated within a certain context. When exporting/importing
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sessions with \fBi2d_SSL_SESSION\fR/\fBd2i_SSL_SESSION\fR it would be possible,
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to re-import a session generated from another context (e.g. another
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application), which might lead to malfunctions. Therefore each application
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must set its own session id context \fBsid_ctx\fR which is used to distinguish
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the contexts and is stored in exported sessions. The \fBsid_ctx\fR can be
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any kind of binary data with a given length, it is therefore possible
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to use e.g. the name of the application and/or the hostname and/or service
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name ...
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.PP
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The session id context becomes part of the session. The session id context
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is set by the \s-1SSL/TLS\s0 server. The \fISSL_CTX_set_session_id_context()\fR and
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\&\fISSL_set_session_id_context()\fR functions are therefore only useful on the
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server side.
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.PP
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OpenSSL clients will check the session id context returned by the server
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when reusing a session.
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.PP
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The maximum length of the \fBsid_ctx\fR is limited to
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\&\fB\s-1SSL_MAX_SSL_SESSION_ID_LENGTH\s0\fR.
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.SH "WARNINGS"
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.IX Header "WARNINGS"
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If the session id context is not set on an \s-1SSL/TLS\s0 server and client
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certificates are used, stored sessions
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will not be reused but a fatal error will be flagged and the handshake
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will fail.
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.PP
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If a server returns a different session id context to an OpenSSL client
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when reusing a session, an error will be flagged and the handshake will
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fail. OpenSSL servers will always return the correct session id context,
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as an OpenSSL server checks the session id context itself before reusing
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a session as described above.
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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\&\fISSL_CTX_set_session_id_context()\fR and \fISSL_set_session_id_context()\fR
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return the following values:
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.IP "0" 4
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The length \fBsid_ctx_len\fR of the session id context \fBsid_ctx\fR exceeded
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the maximum allowed length of \fB\s-1SSL_MAX_SSL_SESSION_ID_LENGTH\s0\fR. The error
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is logged to the error stack.
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.IP "1" 4
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.IX Item "1"
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The operation succeeded.
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\fIssl\fR\|(3)
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