1.\" $OpenBSD: SSL_CTX_set_min_proto_version.3,v 1.1 2017/08/19 23:45:10 schwarze Exp $ 2.\" OpenSSL e9b77246 Jan 20 19:58:49 2017 +0100 3.\" 4.\" This file was written by Kurt Roeckx <kurt@roeckx.be>. 5.\" Copyright (c) 2015 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: August 19 2017 $ 52.Dt SSL_CTX_SET_MIN_PROTO_VERSION 3 53.Os 54.Sh NAME 55.Nm SSL_CTX_set_min_proto_version , 56.Nm SSL_CTX_set_max_proto_version , 57.Nm SSL_set_min_proto_version , 58.Nm SSL_set_max_proto_version 59.Nd set minimum and maximum supported protocol version 60.Sh SYNOPSIS 61.In openssl/ssl.h 62.Ft int 63.Fo SSL_CTX_set_min_proto_version 64.Fa "SSL_CTX *ctx" 65.Fa "uint16_t version" 66.Fc 67.Ft int 68.Fo SSL_CTX_set_max_proto_version 69.Fa "SSL_CTX *ctx" 70.Fa "uint16_t version" 71.Fc 72.Ft int 73.Fo SSL_set_min_proto_version 74.Fa "SSL *ssl" 75.Fa "uint16_t version" 76.Fc 77.Ft int 78.Fo SSL_set_max_proto_version 79.Fa "SSL *ssl" 80.Fa "uint16_t version" 81.Fc 82.Sh DESCRIPTION 83These functions set the minimum and maximum supported protocol 84versions for 85.Fa ctx 86or 87.Fa ssl . 88This works in combination with the options set via 89.Xr SSL_CTX_set_options 3 90that also make it possible to disable specific protocol versions. 91Use these functions instead of disabling specific protocol versions. 92.Pp 93Setting the minimum or maximum version to 0 will enable protocol 94versions down to the lowest or up to the highest version supported 95by the library, respectively. 96.Pp 97Currently supported versions are 98.Sy TLS1_VERSION , 99.Sy TLS1_1_VERSION , 100and 101.Sy TLS1_2_VERSION 102for TLS and 103.Sy DTLS1_VERSION 104for DTLS. 105.Sh RETURN VALUES 106These functions return 1 on success or 0 on failure. 107.Sh SEE ALSO 108.Xr ssl 3 , 109.Xr SSL_CTX_new 3 , 110.Xr SSL_CTX_set_options 3 111.Sh HISTORY 112These functions first appeared in OpenSSL 1.1.0 113and have been available since 114.Ox 6.2 . 115