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SSL_clear(3) OpenSSL SSL_clear(3)
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by Kimmo Suominen.
Based on man-cgi by Panagiotis Christias.
SSL_clear - reset SSL object to allow another connection
int SSL_clear(SSL *ssl);
Reset ssl to allow another connection. All settings (method, ciphers,
BIOs) are kept.
SSL_clear is used to prepare an SSL object for a new connection. While
all settings are kept, a side effect is the handling of the current SSL
session. If a session is still open, it is considered bad and will be
removed from the session cache, as required by RFC2246. A session is
considered open, if SSL_shutdown(3) was not called for the connection
or at least SSL_set_shutdown(3) was used to set the SSL_SENT_SHUTDOWN
If a session was closed cleanly, the session object will be kept and
all settings corresponding. This explicitly means, that e.g. the
special method used during the session will be kept for the next
handshake. So if the session was a TLSv1 session, a SSL client object
will use a TLSv1 client method for the next handshake and a SSL server
object will use a TLSv1 server method, even if TLS_*_methods were
chosen on startup. This will might lead to connection failures (see
SSL_new(3)) for a description of the method's properties.
SSL_clear() resets the SSL object to allow for another connection. The
reset operation however keeps several settings of the last sessions
(some of these settings were made automatically during the last
handshake). It only makes sense for a new connection with the exact
same peer that shares these settings, and may fail if that peer changes
its settings between connections. Use the sequence SSL_get_session(3);
SSL_new(3); SSL_set_session(3); SSL_free(3) instead to avoid such
failures (or simply SSL_free(3); SSL_new(3) if session reuse is not
The following return values can occur:
0 The SSL_clear() operation could not be performed. Check the error
stack to find out the reason.
1 The SSL_clear() operation was successful.
SSL_new(3), SSL_free(3), SSL_shutdown(3), SSL_set_shutdown(3),
SSL_CTX_set_options(3), ssl(7), SSL_CTX_set_client_cert_cb(3)
Copyright 2000-2016 The OpenSSL Project Authors. All Rights Reserved.
Licensed under the OpenSSL license (the "License"). You may not use
this file except in compliance with the License. You can obtain a copy
in the file LICENSE in the source distribution or at
1.1.1i 2018-09-23 SSL_clear(3)