SSL_SESSION_FREE - Online Linux Manual PageSection : 3
Updated : 2021-03-26
Source : 1.1.1k
Note : OpenSSL
NAMESSL_SESSION_new, SSL_SESSION_dup, SSL_SESSION_up_ref, SSL_SESSION_free − create, free and manage SSL_SESSION structures
SYNOPSIS​ #include <openssl/ssl.h> ​ ​ SSL_SESSION *SSL_SESSION_new(void); ​ SSL_SESSION *SSL_SESSION_dup(SSL_SESSION *src); ​ int SSL_SESSION_up_ref(SSL_SESSION *ses); ​ void SSL_SESSION_free(SSL_SESSION *session);
DESCRIPTION​SSL_SESSION_new() creates a new SSL_SESSION structure and returns a pointer to it. ​SSL_SESSION_dup() copies the contents of the SSL_SESSION structure in src and returns a pointer to it. ​SSL_SESSION_up_ref() increments the reference count on the given SSL_SESSION structure. ​SSL_SESSION_free() decrements the reference count of session and removes the SSL_SESSION structure pointed to by session and frees up the allocated memory, if the reference count has reached 0. If session is NULL nothing is done.
NOTES​SSL_SESSION objects are allocated, when a TLS/SSL handshake operation is successfully completed. Depending on the settings, see ​SSL_CTX_set_session_cache_mode (3), the SSL_SESSION objects are internally referenced by the SSL_CTX and linked into its session cache. SSL objects may be using the SSL_SESSION object; as a session may be reused, several SSL objects may be using one SSL_SESSION object at the same time. It is therefore crucial to keep the reference count (usage information) correct and not delete a SSL_SESSION object that is still used, as this may lead to program failures due to dangling pointers. These failures may also appear delayed, e.g. when an SSL_SESSION object was completely freed as the reference count incorrectly became 0, but it is still referenced in the internal session cache and the cache list is processed during a ​SSL_CTX_flush_sessions (3) operation. ​SSL_SESSION_free() must only be called for SSL_SESSION objects, for which the reference count was explicitly incremented (e.g. by calling SSL_get1_session(), see SSL_get_session (3)) or when the SSL_SESSION object was generated outside a TLS handshake operation, e.g. by using d2i_SSL_SESSION (3). It must not be called on other SSL_SESSION objects, as this would cause incorrect reference counts and therefore program failures.
RETURN VALUESSSL_SESSION_new returns a pointer to the newly allocated SSL_SESSION structure or NULL on error. SSL_SESSION_up_ref returns 1 on success or 0 on error.
SEE ALSO​ssl (7), SSL_get_session (3), ​SSL_CTX_set_session_cache_mode (3), ​SSL_CTX_flush_sessions (3), ​d2i_SSL_SESSION (3)
HISTORYThe SSL_SESSION_dup() function was added in OpenSSL 1.1.1.
COPYRIGHTCopyright 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 <https://www.openssl.org/source/license.html>. 0
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