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.\" $OpenBSD: SSL_CTX_set_quiet_shutdown.3,v 1.6 2020/03/30 10:28:59 schwarze Exp $
.\" OpenSSL b97fdb57 Nov 11 09:33:09 2016 +0100
.\"
.\" This file was written by Lutz Jaenicke <jaenicke@openssl.org>.
.\" Copyright (c) 2001, 2005 The OpenSSL Project. All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\"
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\"
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in
.\" the documentation and/or other materials provided with the
.\" distribution.
.\"
.\" 3. All advertising materials mentioning features or use of this
.\" software must display the following acknowledgment:
.\" "This product includes software developed by the OpenSSL Project
.\" for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
.\"
.\" 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
.\" endorse or promote products derived from this software without
.\" prior written permission. For written permission, please contact
.\" openssl-core@openssl.org.
.\"
.\" 5. Products derived from this software may not be called "OpenSSL"
.\" nor may "OpenSSL" appear in their names without prior written
.\" permission of the OpenSSL Project.
.\"
.\" 6. Redistributions of any form whatsoever must retain the following
.\" acknowledgment:
.\" "This product includes software developed by the OpenSSL Project
.\" for use in the OpenSSL Toolkit (http://www.openssl.org/)"
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
.\" EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
.\" ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
.\" SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
.\" LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
.\" STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
.\" OF THE POSSIBILITY OF SUCH DAMAGE.
.\"
.Dd $Mdocdate: March 30 2020 $
.Dt SSL_CTX_SET_QUIET_SHUTDOWN 3
.Os
.Sh NAME
.Nm SSL_CTX_set_quiet_shutdown ,
.Nm SSL_CTX_get_quiet_shutdown ,
.Nm SSL_set_quiet_shutdown ,
.Nm SSL_get_quiet_shutdown
.Nd manipulate shutdown behaviour
.Sh SYNOPSIS
.In openssl/ssl.h
.Ft void
.Fn SSL_CTX_set_quiet_shutdown "SSL_CTX *ctx" "int mode"
.Ft int
.Fn SSL_CTX_get_quiet_shutdown "const SSL_CTX *ctx"
.Ft void
.Fn SSL_set_quiet_shutdown "SSL *ssl" "int mode"
.Ft int
.Fn SSL_get_quiet_shutdown "const SSL *ssl"
.Sh DESCRIPTION
.Fn SSL_CTX_set_quiet_shutdown
sets the
.Dq quiet shutdown
flag for
.Fa ctx
to be
.Fa mode .
.Vt SSL
objects created from
.Fa ctx
inherit the
.Fa mode
valid at the time
.Xr SSL_new 3
is called.
.Fa mode
may be 0 or 1.
.Pp
.Fn SSL_CTX_get_quiet_shutdown
returns the
.Dq quiet shutdown
setting of
.Fa ctx .
.Pp
.Fn SSL_set_quiet_shutdown
sets the
.Dq quiet shutdown
flag for
.Fa ssl
to be
.Fa mode .
The setting stays valid until
.Fa ssl
is removed with
.Xr SSL_free 3
or
.Fn SSL_set_quiet_shutdown
is called again.
It is not changed when
.Xr SSL_clear 3
is called.
.Fa mode
may be 0 or 1.
.Pp
.Fn SSL_get_quiet_shutdown
returns the
.Dq quiet shutdown
setting of
.Fa ssl .
.Pp
Normally when a SSL connection is finished, the parties must send out
.Dq close notify
alert messages using
.Xr SSL_shutdown 3
for a clean shutdown.
.Pp
When setting the
.Dq quiet shutdown
flag to 1,
.Xr SSL_shutdown 3
will set the internal flags to
.Dv SSL_SENT_SHUTDOWN Ns | Ns Dv SSL_RECEIVED_SHUTDOWN
.Po
.Xr SSL_shutdown 3
then behaves like
.Xr SSL_set_shutdown 3
called with
.Dv SSL_SENT_SHUTDOWN Ns | Ns Dv SSL_RECEIVED_SHUTDOWN
.Pc .
The session is thus considered to be shut down, but no
.Dq close notify
alert is sent to the peer.
This behaviour violates the TLS standard.
.Pp
The default is normal shutdown behaviour as described by the TLS standard.
.Sh RETURN VALUES
.Fn SSL_CTX_get_quiet_shutdown
and
.Fn SSL_get_quiet_shutdown
return the current setting.
.Sh SEE ALSO
.Xr ssl 3 ,
.Xr SSL_clear 3 ,
.Xr SSL_free 3 ,
.Xr SSL_new 3 ,
.Xr SSL_set_shutdown 3 ,
.Xr SSL_shutdown 3
.Sh HISTORY
These functions first appeared in SSLeay 0.8.1
and have been available since
.Ox 2.4 .
|
