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Title "SSL_NEW 3ossl" For nroff, turn off justification. Always turn off hyphenation; it makes
way too many mistakes in technical documents.
SSL_dup, SSL_new, SSL_up_ref - create an SSL structure for a connection Header "SYNOPSIS" .Vb 1 #include <openssl/ssl.h> \& SSL *SSL_dup(SSL *s); SSL *SSL_new(SSL_CTX *ctx); int SSL_up_ref(SSL *s); .Ve Header "DESCRIPTION" \fBSSL_new() creates a new \s-1SSL\s0 structure which is needed to hold the data for a \s-1TLS/SSL\s0 connection. The new structure inherits the settings of the underlying context ctx: connection method, options, verification settings, timeout settings. An \s-1SSL\s0 structure is reference counted. Creating an \s-1SSL\s0 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 \s-1SSL\s0 structure are freed.

\fBSSL_up_ref() increments the reference count for an existing \s-1SSL\s0 structure.

The function SSL_dup() creates and returns a new \s-1SSL\s0 structure from the same \fB\s-1SSL_CTX\s0 that was used to create s. It additionally duplicates a subset of the settings in s into the new \s-1SSL\s0 object.

For SSL_dup() to work, the connection \s-1MUST\s0 be in its initial state and \s-1MUST NOT\s0 have yet started the \s-1SSL\s0 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 \s-1SSL\s0 handle that is not in its initial state for reuse, 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:

Item "any session data if configured (including the session_id_context)"

0

Item "any tmp_dh settings set via SSL_set_tmp_dh, SSL_set_tmp_dh_callback, or SSL_set_dh_auto" Item "any configured certificates, private keys or certificate chains" Item "any configured signature algorithms, or client signature algorithms" Item "any DANE settings" Item "any Options set via SSL_set_options" Item "any Mode set via SSL_set_mode" Item "any minimum or maximum protocol settings set via SSL_set_min_proto_version or SSL_set_max_proto_version (Note: Only from OpenSSL 1.1.1h and above)" Item "any verify mode, callback or depth set via SSL_set_verify or SSL_set_verify_depth or any configured X509 verification parameters" Item "any msg callback or info callback set via SSL_set_msg_callback or SSL_set_info_callback" Item "any default password callback set via SSL_set_default_passwd_cb" Item "any session id generation callback set via SSL_set_generate_session_id" Item "any configured Cipher List" Item "initial accept (server) or connect (client) state" Item "the max cert list value set via SSL_set_max_cert_list" Item "the read_ahead value set via SSL_set_read_ahead" Item "application specific data set via SSL_set_ex_data" Item "any CA list or client CA list set via SSL_set0_CA_list, SSL_set0_client_CA_list() or similar functions" Item "any security level settings or callbacks" Item "any configured serverinfo data" Item "any configured PSK identity hint" Item "any configured custom extensions" Item "any client certificate types configured via SSL_set1_client_certificate_types"

Header "RETURN VALUES" The following return values can occur: Item "NULL" The creation of a new \s-1SSL\s0 structure failed. Check the error stack to find out the reason. Item "Pointer to an SSL structure" The return value points to an allocated \s-1SSL\s0 structure. .Sp \fBSSL_up_ref() returns 1 for success and 0 for failure. Header "SEE ALSO" \fBSSL_free\|(3), SSL_clear\|(3), \fBSSL_CTX_set_options\|(3), \fBSSL_get_SSL_CTX\|(3), \fBssl\|(7) Header "COPYRIGHT" Copyright 2000-2023 The OpenSSL Project Authors. All Rights Reserved.

Licensed under the Apache License 2.0 (the \*(L"License\*(R"). You may not use this file except in compliance with the License. You can obtain a copy in the file \s-1LICENSE\s0 in the source distribution or at <https://www.openssl.org/source/license.html>.