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✏️ Editing: SSL_dup.3

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.\" ========================================================================
.\"
.IX Title "SSL_NEW 3"
.TH SSL_NEW 3 "2023-09-11" "1.1.1w" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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.nh
.SH "NAME"
SSL_dup, SSL_new, SSL_up_ref \- create an SSL structure for a connection
.SH "SYNOPSIS"
.IX 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
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fBSSL_new()\fR creates a new \fB\s-1SSL\s0\fR 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 \fBctx\fR: connection method,
options, verification settings, timeout settings. An \fB\s-1SSL\s0\fR structure is
reference counted. Creating an \fB\s-1SSL\s0\fR 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 \fB\s-1SSL\s0\fR
structure are freed.
.PP
\&\fBSSL_up_ref()\fR increments the reference count for an
existing \fB\s-1SSL\s0\fR structure.
.PP
The function \fBSSL_dup()\fR creates and returns a new \fB\s-1SSL\s0\fR structure from the same
\&\fB\s-1SSL_CTX\s0\fR that was used to create \fIs\fR. It additionally duplicates a subset of
the settings in \fIs\fR into the new \fB\s-1SSL\s0\fR object.
.PP
For \fBSSL_dup()\fR 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 \fBSSL_dup()\fR just increments an internal
reference count and returns the \fIsame\fR handle.  It may be possible to
use \fBSSL_clear\fR\|(3) to recycle an \s-1SSL\s0 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.
.PP
The subset of settings in \fIs\fR that are duplicated are:
.IP "any session data if configured (including the session_id_context)" 4
.IX Item "any session data if configured (including the session_id_context)"
.PD 0
.IP "any tmp_dh settings set via \fBSSL_set_tmp_dh\fR\|(3), \fBSSL_set_tmp_dh_callback\fR\|(3), or \fBSSL_set_dh_auto\fR\|(3)" 4
.IX Item "any tmp_dh settings set via SSL_set_tmp_dh, SSL_set_tmp_dh_callback, or SSL_set_dh_auto"
.IP "any configured certificates, private keys or certificate chains" 4
.IX Item "any configured certificates, private keys or certificate chains"
.IP "any configured signature algorithms, or client signature algorithms" 4
.IX Item "any configured signature algorithms, or client signature algorithms"
.IP "any \s-1DANE\s0 settings" 4
.IX Item "any DANE settings"
.IP "any Options set via \fBSSL_set_options\fR\|(3)" 4
.IX Item "any Options set via SSL_set_options"
.IP "any Mode set via \fBSSL_set_mode\fR\|(3)" 4
.IX Item "any Mode set via SSL_set_mode"
.IP "any minimum or maximum protocol settings set via \fBSSL_set_min_proto_version\fR\|(3) or \fBSSL_set_max_proto_version\fR\|(3) (Note: Only from OpenSSL 1.1.1h and above)" 4
.IX 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)"
.IP "any Verify mode, callback or depth set via \fBSSL_set_verify\fR\|(3) or \fBSSL_set_verify_depth\fR\|(3) or any configured X509 verification parameters" 4
.IX Item "any Verify mode, callback or depth set via SSL_set_verify or SSL_set_verify_depth or any configured X509 verification parameters"
.IP "any msg callback or info callback set via \fBSSL_set_msg_callback\fR\|(3) or \fBSSL_set_info_callback\fR\|(3)" 4
.IX Item "any msg callback or info callback set via SSL_set_msg_callback or SSL_set_info_callback"
.IP "any default password callback set via \fBSSL_set_default_passwd_cb\fR\|(3)" 4
.IX Item "any default password callback set via SSL_set_default_passwd_cb"
.IP "any session id generation callback set via \fBSSL_set_generate_session_id\fR\|(3)" 4
.IX Item "any session id generation callback set via SSL_set_generate_session_id"
.IP "any configured Cipher List" 4
.IX Item "any configured Cipher List"
.IP "initial accept (server) or connect (client) state" 4
.IX Item "initial accept (server) or connect (client) state"
.IP "the max cert list value set via \fBSSL_set_max_cert_list\fR\|(3)" 4
.IX Item "the max cert list value set via SSL_set_max_cert_list"
.IP "the read_ahead value set via \fBSSL_set_read_ahead\fR\|(3)" 4
.IX Item "the read_ahead value set via SSL_set_read_ahead"
.IP "application specific data set via \fBSSL_set_ex_data\fR\|(3)" 4
.IX Item "application specific data set via SSL_set_ex_data"
.IP "any \s-1CA\s0 list or client \s-1CA\s0 list set via \fBSSL_set0_CA_list\fR\|(3), \fBSSL_set0_client_CA_list()\fR or similar functions" 4
.IX Item "any CA list or client CA list set via SSL_set0_CA_list, SSL_set0_client_CA_list() or similar functions"
.IP "any security level settings or callbacks" 4
.IX Item "any security level settings or callbacks"
.IP "any configured serverinfo data" 4
.IX Item "any configured serverinfo data"
.IP "any configured \s-1PSK\s0 identity hint" 4
.IX Item "any configured PSK identity hint"
.IP "any configured custom extensions" 4
.IX Item "any configured custom extensions"
.IP "any client certificate types configured via SSL_set1_client_certificate_types" 4
.IX Item "any client certificate types configured via SSL_set1_client_certificate_types"
.PD
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
The following return values can occur:
.IP "\s-1NULL\s0" 4
.IX Item "NULL"
The creation of a new \s-1SSL\s0 structure failed. Check the error stack to
find out the reason.
.IP "Pointer to an \s-1SSL\s0 structure" 4
.IX Item "Pointer to an SSL structure"
The return value points to an allocated \s-1SSL\s0 structure.
.Sp
\&\fBSSL_up_ref()\fR returns 1 for success and 0 for failure.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBSSL_free\fR\|(3), \fBSSL_clear\fR\|(3),
\&\fBSSL_CTX_set_options\fR\|(3),
\&\fBSSL_get_SSL_CTX\fR\|(3),
\&\fBssl\fR\|(7)
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2000\-2020 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the OpenSSL license (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>.

MR SKB