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opnsense-src/secure/lib/libcrypto/man/man3/SSL_set_session.3
Pierre Pronchery b077aed33b Merge OpenSSL 3.0.9 
Migrate to OpenSSL 3.0 in advance of FreeBSD 14.0.  OpenSSL 1.1.1 (the
version we were previously using) will be EOL as of 2023-09-11.

Most of the base system has already been updated for a seamless switch
to OpenSSL 3.0.  For many components we've added
`-DOPENSSL_API_COMPAT=0x10100000L` to CFLAGS to specify the API version,
which avoids deprecation warnings from OpenSSL 3.0.  Changes have also
been made to avoid OpenSSL APIs that were already deprecated in OpenSSL
1.1.1.  The process of updating to contemporary APIs can continue after
this merge.

Additional changes are still required for libarchive and Kerberos-
related libraries or tools; workarounds will immediately follow this
commit.  Fixes are in progress in the upstream projects and will be
incorporated when those are next updated.

There are some performance regressions in benchmarks (certain tests in
`openssl speed`) and in some OpenSSL consumers in ports (e.g.  haproxy).
Investigation will continue for these.

Netflix's testing showed no functional regression and a rather small,
albeit statistically significant, increase in CPU consumption with
OpenSSL 3.0.

Thanks to ngie@ and des@ for updating base system components, to
antoine@ and bofh@ for ports exp-runs and port fixes/workarounds, and to
Netflix and everyone who tested prior to commit or contributed to this
update in other ways.

PR:		271615
PR:		271656 [exp-run]
Relnotes:	Yes
Sponsored by:	The FreeBSD Foundation
2023-06-23 18:53:36 -04:00

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.\" ========================================================================
.\"
.IX Title "SSL_SET_SESSION 3"
.TH SSL_SET_SESSION 3 "2023-05-30" "3.0.9" "OpenSSL"
.\" For nroff, turn off justification. Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
SSL_set_session \- set a TLS/SSL session to be used during TLS/SSL connect
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/ssl.h>
\&
\& int SSL_set_session(SSL *ssl, SSL_SESSION *session);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fBSSL_set_session()\fR sets \fBsession\fR to be used when the \s-1TLS/SSL\s0 connection
is to be established. \fBSSL_set_session()\fR is only useful for \s-1TLS/SSL\s0 clients.
When the session is set, the reference count of \fBsession\fR is incremented
by 1. If the session is not reused, the reference count is decremented
again during \fBSSL_connect()\fR. Whether the session was reused can be queried
with the \fBSSL_session_reused\fR\|(3) call.
.PP
If there is already a session set inside \fBssl\fR (because it was set with
\&\fBSSL_set_session()\fR before or because the same \fBssl\fR was already used for
a connection), \fBSSL_SESSION_free()\fR will be called for that session.
This is also the case when \fBsession\fR is a \s-1NULL\s0 pointer. If that old
session is still \fBopen\fR, it is considered bad and will be removed from the
session cache (if used). A session is considered open, if \fBSSL_shutdown\fR\|(3) was
not called for the connection (or at least \fBSSL_set_shutdown\fR\|(3) was used to
set the \s-1SSL_SENT_SHUTDOWN\s0 state).
.SH "NOTES"
.IX Header "NOTES"
\&\s-1SSL_SESSION\s0 objects keep internal link information about the session cache
list, when being inserted into one \s-1SSL_CTX\s0 object's session cache.
One \s-1SSL_SESSION\s0 object, regardless of its reference count, must therefore
only be used with one \s-1SSL_CTX\s0 object (and the \s-1SSL\s0 objects created
from this \s-1SSL_CTX\s0 object).
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
The following return values can occur:
.IP "0" 4
The operation failed; check the error stack to find out the reason.
.IP "1" 4
.IX Item "1"
The operation succeeded.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBssl\fR\|(7), \fBSSL_SESSION_free\fR\|(3),
\&\fBSSL_get_session\fR\|(3),
\&\fBSSL_session_reused\fR\|(3),
\&\fBSSL_CTX_set_session_cache_mode\fR\|(3)
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2000\-2022 The OpenSSL Project Authors. All Rights Reserved.
.PP
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>.
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