SSL_CTX_SET_MIN_PROTO_VERSION(3ossl) OpenSSL
NAME
SSL_CTX_set_min_proto_version, SSL_CTX_set_max_proto_version,
SSL_CTX_get_min_proto_version, SSL_CTX_get_max_proto_version,
SSL_set_min_proto_version, SSL_set_max_proto_version,
SSL_get_min_proto_version, SSL_get_max_proto_version - Get and set
minimum and maximum supported protocol version
SYNOPSIS
#include <openssl/ssl.h>
int SSL_CTX_set_min_proto_version(SSL_CTX *ctx, int version);
int SSL_CTX_set_max_proto_version(SSL_CTX *ctx, int version);
int SSL_CTX_get_min_proto_version(SSL_CTX *ctx);
int SSL_CTX_get_max_proto_version(SSL_CTX *ctx);
int SSL_set_min_proto_version(SSL *ssl, int version);
int SSL_set_max_proto_version(SSL *ssl, int version);
int SSL_get_min_proto_version(SSL *ssl);
int SSL_get_max_proto_version(SSL *ssl);
DESCRIPTION
The functions get or set the minimum and maximum supported protocol
versions for the ctx or ssl. This works in combination with the
options set via SSL_CTX_set_options(3) that also make it possible to
disable specific protocol versions. Use these functions instead of
disabling specific protocol versions.
Setting the minimum or maximum version to 0 (default), will enable
protocol versions down to the lowest version, or up to the highest
version supported by the library, respectively. The supported versions
might be controlled by system configuration.
Getters return 0 in case ctx or ssl have been configured to
automatically use the lowest or highest version supported by the
library.
Currently supported versions are SSL3_VERSION, TLS1_VERSION,
TLS1_1_VERSION, TLS1_2_VERSION, TLS1_3_VERSION for TLS and
DTLS1_VERSION, DTLS1_2_VERSION for DTLS.
In the current version of OpenSSL only QUICv1 is supported in
conjunction with TLSv1.3. Calling these functions on a QUIC object has
no effect.
RETURN VALUES
These setter functions return 1 on success and 0 on failure. The getter
functions return the configured version or 0 for auto-configuration of
lowest or highest protocol, respectively.
NOTES
All these functions are implemented using macros.
SEE ALSO
ssl(7), SSL_CTX_set_options(3), SSL_CONF_cmd(3)
HISTORY
The setter functions were added in OpenSSL 1.1.0. The getter functions
were added in OpenSSL 1.1.1.
COPYRIGHT
Copyright 2016-2025 The OpenSSL Project Authors. All Rights Reserved.
Licensed under the Apache License 2.0 (the "License"). You may not use
this file except in compliance with the License. You can obtain a copy
in the file LICENSE in the source distribution or at
<https://www.openssl.org/source/license.html>.
3.5.1 2025-07-02
SSL_CTX_SET_MIN_PROTO_VERSION(3ossl)
openssl 3.5.1 - Generated Sat Aug 2 05:13:06 CDT 2025