1=pod
2
3=head1 NAME
4
5SSL_CTX_set_min_proto_version, SSL_CTX_set_max_proto_version,
6SSL_CTX_get_min_proto_version, SSL_CTX_get_max_proto_version,
7SSL_set_min_proto_version, SSL_set_max_proto_version,
8SSL_get_min_proto_version, SSL_get_max_proto_version - Get and set minimum
9and maximum supported protocol version
10
11=head1 SYNOPSIS
12
13 #include <openssl/ssl.h>
14
15 int SSL_CTX_set_min_proto_version(SSL_CTX *ctx, int version);
16 int SSL_CTX_set_max_proto_version(SSL_CTX *ctx, int version);
17 int SSL_CTX_get_min_proto_version(SSL_CTX *ctx);
18 int SSL_CTX_get_max_proto_version(SSL_CTX *ctx);
19
20 int SSL_set_min_proto_version(SSL *ssl, int version);
21 int SSL_set_max_proto_version(SSL *ssl, int version);
22 int SSL_get_min_proto_version(SSL *ssl);
23 int SSL_get_max_proto_version(SSL *ssl);
24
25=head1 DESCRIPTION
26
27The functions get or set the minimum and maximum supported protocol versions
28for the B<ctx> or B<ssl>.
29This works in combination with the options set via
30L<SSL_CTX_set_options(3)> that also make it possible to disable
31specific protocol versions.
32Use these functions instead of disabling specific protocol versions.
33
34Setting the minimum or maximum version to 0, will enable protocol
35versions down to the lowest version, or up to the highest version
36supported by the library, respectively.
37
38Getters return 0 in case B<ctx> or B<ssl> have been configured to
39automatically use the lowest or highest version supported by the library.
40
41Currently supported versions are B<SSL3_VERSION>, B<TLS1_VERSION>,
42B<TLS1_1_VERSION>, B<TLS1_2_VERSION>, B<TLS1_3_VERSION> for TLS and
43B<DTLS1_VERSION>, B<DTLS1_2_VERSION> for DTLS.
44
45In the current version of OpenSSL only QUICv1 is supported in conjunction with
46TLSv1.3. Calling these functions on a QUIC object has no effect.
47
48=head1 RETURN VALUES
49
50These setter functions return 1 on success and 0 on failure. The getter
51functions return the configured version or 0 for auto-configuration of
52lowest or highest protocol, respectively.
53
54=head1 NOTES
55
56All these functions are implemented using macros.
57
58=head1 SEE ALSO
59
60L<ssl(7)>,
61L<SSL_CTX_set_options(3)>, L<SSL_CONF_cmd(3)>
62
63=head1 HISTORY
64
65The setter functions were added in OpenSSL 1.1.0. The getter functions
66were added in OpenSSL 1.1.1.
67
68=head1 COPYRIGHT
69
70Copyright 2016-2023 The OpenSSL Project Authors. All Rights Reserved.
71
72Licensed under the Apache License 2.0 (the "License").  You may not use
73this file except in compliance with the License.  You can obtain a copy
74in the file LICENSE in the source distribution or at
75L<https://www.openssl.org/source/license.html>.
76
77=cut
78