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author | marha <marha@users.sourceforge.net> | 2009-06-28 22:07:26 +0000 |
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committer | marha <marha@users.sourceforge.net> | 2009-06-28 22:07:26 +0000 |
commit | 3562e78743202e43aec8727005182a2558117eca (patch) | |
tree | 8f9113a77d12470c5c851a2a8e4cb02e89df7d43 /openssl/doc/ssl/SSL_CTX_set_session_id_context.pod | |
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Diffstat (limited to 'openssl/doc/ssl/SSL_CTX_set_session_id_context.pod')
-rw-r--r-- | openssl/doc/ssl/SSL_CTX_set_session_id_context.pod | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/openssl/doc/ssl/SSL_CTX_set_session_id_context.pod b/openssl/doc/ssl/SSL_CTX_set_session_id_context.pod new file mode 100644 index 000000000..58fc68550 --- /dev/null +++ b/openssl/doc/ssl/SSL_CTX_set_session_id_context.pod @@ -0,0 +1,83 @@ +=pod + +=head1 NAME + +SSL_CTX_set_session_id_context, SSL_set_session_id_context - set context within which session can be reused (server side only) + +=head1 SYNOPSIS + + #include <openssl/ssl.h> + + int SSL_CTX_set_session_id_context(SSL_CTX *ctx, const unsigned char *sid_ctx, + unsigned int sid_ctx_len); + int SSL_set_session_id_context(SSL *ssl, const unsigned char *sid_ctx, + unsigned int sid_ctx_len); + +=head1 DESCRIPTION + +SSL_CTX_set_session_id_context() sets the context B<sid_ctx> of length +B<sid_ctx_len> within which a session can be reused for the B<ctx> object. + +SSL_set_session_id_context() sets the context B<sid_ctx> of length +B<sid_ctx_len> within which a session can be reused for the B<ssl> object. + +=head1 NOTES + +Sessions are generated within a certain context. When exporting/importing +sessions with B<i2d_SSL_SESSION>/B<d2i_SSL_SESSION> it would be possible, +to re-import a session generated from another context (e.g. another +application), which might lead to malfunctions. Therefore each application +must set its own session id context B<sid_ctx> which is used to distinguish +the contexts and is stored in exported sessions. The B<sid_ctx> can be +any kind of binary data with a given length, it is therefore possible +to use e.g. the name of the application and/or the hostname and/or service +name ... + +The session id context becomes part of the session. The session id context +is set by the SSL/TLS server. The SSL_CTX_set_session_id_context() and +SSL_set_session_id_context() functions are therefore only useful on the +server side. + +OpenSSL clients will check the session id context returned by the server +when reusing a session. + +The maximum length of the B<sid_ctx> is limited to +B<SSL_MAX_SSL_SESSION_ID_LENGTH>. + +=head1 WARNINGS + +If the session id context is not set on an SSL/TLS server and client +certificates are used, stored sessions +will not be reused but a fatal error will be flagged and the handshake +will fail. + +If a server returns a different session id context to an OpenSSL client +when reusing a session, an error will be flagged and the handshake will +fail. OpenSSL servers will always return the correct session id context, +as an OpenSSL server checks the session id context itself before reusing +a session as described above. + +=head1 RETURN VALUES + +SSL_CTX_set_session_id_context() and SSL_set_session_id_context() +return the following values: + +=over 4 + +=item 0 + +The length B<sid_ctx_len> of the session id context B<sid_ctx> exceeded +the maximum allowed length of B<SSL_MAX_SSL_SESSION_ID_LENGTH>. The error +is logged to the error stack. + +=item 1 + +The operation succeeded. + +=back + +=head1 SEE ALSO + +L<ssl(3)|ssl(3)> + +=cut |