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https://github.com/moparisthebest/curl
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c7f3c073f4
Since 7.54 --tlsv1. options use the specified version or later, however older versions of curl documented it as using just the specified version which may or may not have happened depending on the TLS library. Document this discrepancy to allay confusion for users familiar with the old documentation that expect just the specified version. Fixes https://github.com/curl/curl/issues/4097 Closes https://github.com/curl/curl/pull/4119
114 lines
4.3 KiB
Groff
114 lines
4.3 KiB
Groff
.\" **************************************************************************
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.\" * _ _ ____ _
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.\" * Project ___| | | | _ \| |
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.\" * / __| | | | |_) | |
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.\" * | (__| |_| | _ <| |___
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.\" * \___|\___/|_| \_\_____|
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.\" *
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.\" * Copyright (C) 1998 - 2015, 2018, Daniel Stenberg, <daniel@haxx.se>, et al.
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.\" *
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.\" * This software is licensed as described in the file COPYING, which
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.\" * you should have received as part of this distribution. The terms
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.\" * are also available at https://curl.haxx.se/docs/copyright.html.
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.\" *
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.\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
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.\" * copies of the Software, and permit persons to whom the Software is
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.\" * furnished to do so, under the terms of the COPYING file.
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.\" *
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.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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.\" * KIND, either express or implied.
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.\" *
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.\" **************************************************************************
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.\"
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.TH CURLOPT_SSLVERSION 3 "17 Jun 2014" "libcurl 7.37.0" "curl_easy_setopt options"
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.SH NAME
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CURLOPT_SSLVERSION \- set preferred TLS/SSL version
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.SH SYNOPSIS
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#include <curl/curl.h>
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CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SSLVERSION, long version);
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.SH DESCRIPTION
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Pass a long as parameter to control which version range of SSL/TLS versions to
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use.
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The SSL and TLS versions have typically developed from the most insecure
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version to be more and more secure in this order through history: SSL v2,
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SSLv3, TLS v1.0, TLS v1.1, TLS v1.2 and the most recent TLS v1.3.
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Use one of the available defines for this purpose. The available options are:
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.RS
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.IP CURL_SSLVERSION_DEFAULT
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The default acceptable version range. The minimum acceptable version is by
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default TLS v1.0 since 7.39.0 (unless the TLS library has a stricter rule).
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.IP CURL_SSLVERSION_TLSv1
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TLS v1.0 or later
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.IP CURL_SSLVERSION_SSLv2
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SSL v2 (but not SSLv3)
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.IP CURL_SSLVERSION_SSLv3
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SSL v3 (but not SSLv2)
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.IP CURL_SSLVERSION_TLSv1_0
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TLS v1.0 or later (Added in 7.34.0)
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.IP CURL_SSLVERSION_TLSv1_1
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TLS v1.1 or later (Added in 7.34.0)
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.IP CURL_SSLVERSION_TLSv1_2
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TLS v1.2 or later (Added in 7.34.0)
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.IP CURL_SSLVERSION_TLSv1_3
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TLS v1.3 or later (Added in 7.52.0)
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.RE
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The maximum TLS version can be set by using \fIone\fP of the
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CURL_SSLVERSION_MAX_ macros below. It is also possible to OR \fIone\fP of the
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CURL_SSLVERSION_ macros with \fIone\fP of the CURL_SSLVERSION_MAX_ macros.
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The MAX macros are not supported for WolfSSL.
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.RS
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.IP CURL_SSLVERSION_MAX_DEFAULT
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The flag defines the maximum supported TLS version by libcurl, or the default
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value from the SSL library is used. libcurl will use a sensible default
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maximum, which was TLS v1.2 up to before 7.61.0 and is TLS v1.3 since then -
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assuming the TLS library support it. (Added in 7.54.0)
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.IP CURL_SSLVERSION_MAX_TLSv1_0
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The flag defines maximum supported TLS version as TLS v1.0.
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(Added in 7.54.0)
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.IP CURL_SSLVERSION_MAX_TLSv1_1
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The flag defines maximum supported TLS version as TLS v1.1.
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(Added in 7.54.0)
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.IP CURL_SSLVERSION_MAX_TLSv1_2
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The flag defines maximum supported TLS version as TLS v1.2.
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(Added in 7.54.0)
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.IP CURL_SSLVERSION_MAX_TLSv1_3
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The flag defines maximum supported TLS version as TLS v1.3.
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(Added in 7.54.0)
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.RE
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In versions of curl prior to 7.54 the CURL_SSLVERSION_TLS options were
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documented to allow \fIonly\fP the specified TLS version, but behavior was
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inconsistent depending on the TLS library.
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.SH DEFAULT
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CURL_SSLVERSION_DEFAULT
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.SH PROTOCOLS
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All TLS based protocols: HTTPS, FTPS, IMAPS, POP3S, SMTPS etc.
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.SH EXAMPLE
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.nf
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CURL *curl = curl_easy_init();
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if(curl) {
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curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
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/* ask libcurl to use TLS version 1.0 or later */
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curl_easy_setopt(curl, CURLOPT_SSLVERSION, CURL_SSLVERSION_TLSv1);
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/* Perform the request */
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curl_easy_perform(curl);
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}
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.fi
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.SH AVAILABILITY
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SSLv2 is disabled by default since 7.18.1. Other SSL versions availability may
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vary depending on which backend libcurl has been built to use.
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SSLv3 is disabled by default since 7.39.0.
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.SH RETURN VALUE
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Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
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.SH "SEE ALSO"
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.BR CURLOPT_USE_SSL "(3), " CURLOPT_HTTP_VERSION "(3), "
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.BR CURLOPT_PROXY_SSLVERSION "(3), " CURLOPT_IPRESOLVE "(3) "
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