1.\" $OpenBSD: SSL_CTX_set_ssl_version.3,v 1.4 2018/03/27 17:35:50 schwarze Exp $ 2.\" OpenSSL b97fdb57 Nov 11 09:33:09 2016 +0100 3.\" 4.\" This file was written by Lutz Jaenicke <jaenicke@openssl.org>. 5.\" Copyright (c) 2000, 2001, 2005 The OpenSSL Project. All rights reserved. 6.\" 7.\" Redistribution and use in source and binary forms, with or without 8.\" modification, are permitted provided that the following conditions 9.\" are met: 10.\" 11.\" 1. Redistributions of source code must retain the above copyright 12.\" notice, this list of conditions and the following disclaimer. 13.\" 14.\" 2. Redistributions in binary form must reproduce the above copyright 15.\" notice, this list of conditions and the following disclaimer in 16.\" the documentation and/or other materials provided with the 17.\" distribution. 18.\" 19.\" 3. All advertising materials mentioning features or use of this 20.\" software must display the following acknowledgment: 21.\" "This product includes software developed by the OpenSSL Project 22.\" for use in the OpenSSL Toolkit. (http://www.openssl.org/)" 23.\" 24.\" 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 25.\" endorse or promote products derived from this software without 26.\" prior written permission. For written permission, please contact 27.\" openssl-core@openssl.org. 28.\" 29.\" 5. Products derived from this software may not be called "OpenSSL" 30.\" nor may "OpenSSL" appear in their names without prior written 31.\" permission of the OpenSSL Project. 32.\" 33.\" 6. Redistributions of any form whatsoever must retain the following 34.\" acknowledgment: 35.\" "This product includes software developed by the OpenSSL Project 36.\" for use in the OpenSSL Toolkit (http://www.openssl.org/)" 37.\" 38.\" THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 39.\" EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 40.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 41.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 42.\" ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 43.\" SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 44.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 45.\" LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 46.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 47.\" STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 48.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 49.\" OF THE POSSIBILITY OF SUCH DAMAGE. 50.\" 51.Dd $Mdocdate: March 27 2018 $ 52.Dt SSL_CTX_SET_SSL_VERSION 3 53.Os 54.Sh NAME 55.Nm SSL_CTX_set_ssl_version , 56.Nm SSL_set_ssl_method , 57.Nm SSL_get_ssl_method 58.Nd choose a new TLS/SSL method 59.Sh SYNOPSIS 60.In openssl/ssl.h 61.Ft int 62.Fn SSL_CTX_set_ssl_version "SSL_CTX *ctx" "const SSL_METHOD *method" 63.Ft int 64.Fn SSL_set_ssl_method "SSL *s" "const SSL_METHOD *method" 65.Ft const SSL_METHOD * 66.Fn SSL_get_ssl_method "SSL *ssl" 67.Sh DESCRIPTION 68.Fn SSL_CTX_set_ssl_version 69sets a new default TLS/SSL 70.Fa method 71for 72.Vt SSL 73objects newly created from this 74.Fa ctx . 75.Vt SSL 76objects already created with 77.Xr SSL_new 3 78are not affected, except when 79.Xr SSL_clear 3 80is called. 81.Pp 82.Fn SSL_set_ssl_method 83sets a new TLS/SSL 84.Fa method 85for a particular 86.Vt SSL 87object 88.Fa s . 89It may be reset when 90.Xr SSL_clear 3 91is called. 92.Pp 93.Fn SSL_get_ssl_method 94returns a function pointer to the TLS/SSL method set in 95.Fa ssl . 96.Pp 97The available 98.Fa method 99choices are described in 100.Xr SSL_CTX_new 3 . 101.Pp 102When 103.Xr SSL_clear 3 104is called and no session is connected to an 105.Vt SSL 106object, the method of the 107.Vt SSL 108object is reset to the method currently set in the corresponding 109.Vt SSL_CTX 110object. 111.Sh RETURN VALUES 112The following return values can occur for 113.Fn SSL_CTX_set_ssl_version 114and 115.Fn SSL_set_ssl_method : 116.Bl -tag -width Ds 117.It 0 118The new choice failed. 119Check the error stack to find out the reason. 120.It 1 121The operation succeeded. 122.El 123.Sh SEE ALSO 124.Xr ssl 3 , 125.Xr SSL_clear 3 , 126.Xr SSL_CTX_new 3 , 127.Xr SSL_new 3 , 128.Xr SSL_set_connect_state 3 129.Sh HISTORY 130.Fn SSL_CTX_set_ssl_version , 131.Fn SSL_set_ssl_method , 132and 133.Fn SSL_get_ssl_method 134first appeared in SSLeay 0.8.0 and have been available since 135.Ox 2.4 . 136