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SSL_new(3) OpenSSL SSL_new(3)
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SSL_dup, SSL_new, SSL_up_ref - create an SSL structure for a connection
SSL *SSL_dup(SSL *s);
SSL *SSL_new(SSL_CTX *ctx);
int SSL_up_ref(SSL *s);
SSL_new() creates a new SSL structure which is needed to hold the data
for a TLS/SSL connection. The new structure inherits the settings of
the underlying context ctx: connection method, options, verification
settings, timeout settings. An SSL structure is reference counted.
Creating an SSL structure for the first time increments the reference
count. Freeing it (using SSL_free) decrements it. When the reference
count drops to zero, any memory or resources allocated to the SSL
structure are freed.
SSL_up_ref() increments the reference count for an existing SSL
The function SSL_dup() creates and returns a new SSL structure from the
same SSL_CTX that was used to create s. It additionally duplicates a
subset of the settings in s into the new SSL object.
For SSL_dup() to work, the connection MUST be in its initial state and
MUST NOT have yet started the SSL handshake. For connections that are
not in their initial state SSL_dup() just increments an internal
reference count and returns the same handle. It may be possible to use
SSL_clear(3) to recycle an SSL handle that is not in its initial state
for re-use, but this is best avoided. Instead, save and restore the
session, if desired, and construct a fresh handle for each connection.
The subset of settings in s that are duplicated are:
any session data if configured (including the session_id_context)
any tmp_dh settings set via SSL_set_tmp_dh(3),
SSL_set_tmp_dh_callback(3), or SSL_set_dh_auto(3)
any configured certificates, private keys or certificate chains
any configured signature algorithms, or client signature algorithms
any DANE settings
any Options set via SSL_set_options(3)
any Mode set via SSL_set_mode(3)
any minimum or maximum protocol settings set via
SSL_set_min_proto_version(3) or SSL_set_max_proto_version(3) (Note:
Only from OpenSSL 1.1.1h and above)
any Verify mode, callback or depth set via SSL_set_verify(3) or
SSL_set_verify_depth(3) or any configured X509 verification parameters
any msg callback or info callback set via SSL_set_msg_callback(3) or
any default password callback set via SSL_set_default_passwd_cb(3)
any session id generation callback set via
any configured Cipher List
initial accept (server) or connect (client) state
the max cert list value set via SSL_set_max_cert_list(3)
the read_ahead value set via SSL_set_read_ahead(3)
application specific data set via SSL_set_ex_data(3)
any CA list or client CA list set via SSL_set0_CA_list(3),
SSL_set0_client_CA_list() or similar functions
any security level settings or callbacks
any configured serverinfo data
any configured PSK identity hint
any configured custom extensions
any client certificate types configured via
The following return values can occur:
The creation of a new SSL structure failed. Check the error stack
to find out the reason.
Pointer to an SSL structure
The return value points to an allocated SSL structure.
SSL_up_ref() returns 1 for success and 0 for failure.
SSL_free(3), SSL_clear(3), SSL_CTX_set_options(3), SSL_get_SSL_CTX(3),
Copyright 2000-2020 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 2020-12-10 SSL_new(3)