b4f9ae5126
- If the user set a legacy algorithm list (CURLOPT_SSL_CIPHER_LIST) then
use the SCHANNEL_CRED legacy structure to pass the list to Schannel.
- If the user set both a legacy algorithm list and a TLS 1.3 cipher list
then abort.
Although MS doesn't document it, Schannel will not negotiate TLS 1.3
when SCHANNEL_CRED is used. That means setting a legacy algorithm list
limits the user to earlier versions of TLS.
Prior to this change, since 8beff435 (precedes 7.85.0), libcurl would
ignore legacy algorithms in Windows 10 1809 and later.
Reported-by: zhihaoy@users.noreply.github.com
Fixes https://github.com/curl/curl/pull/10741
Closes https://github.com/curl/curl/pull/10746
75 lines
2.8 KiB
Groff
75 lines
2.8 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) 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.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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.\" * SPDX-License-Identifier: curl
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.\" *
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.\" **************************************************************************
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.\"
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.TH CURLOPT_TLS13_CIPHERS 3 "25 May 2018" libcurl libcurl
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.SH NAME
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CURLOPT_TLS13_CIPHERS \- ciphers suites to use for TLS 1.3
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.SH SYNOPSIS
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.nf
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#include <curl/curl.h>
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CURLcode curl_easy_setopt(CURL *handle, CURLOPT_TLS13_CIPHERS, char *list);
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.fi
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.SH DESCRIPTION
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Pass a char *, pointing to a null-terminated string holding the list of cipher
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suites to use for the TLS 1.3 connection. The list must be syntactically
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correct, it consists of one or more cipher suite strings separated by colons.
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You will find more details about cipher lists on this URL:
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https://curl.se/docs/ssl-ciphers.html
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This option is currently used only when curl is built to use OpenSSL 1.1.1 or
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later, or Schannel. If you are using a different SSL backend you can try
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setting TLS 1.3 cipher suites by using the \fICURLOPT_SSL_CIPHER_LIST(3)\fP
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option.
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The application does not have to keep the string around after setting this
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option.
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.SH DEFAULT
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NULL, use internal 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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curl_easy_setopt(curl, CURLOPT_TLS13_CIPHERS,
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"TLS_CHACHA20_POLY1305_SHA256");
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ret = curl_easy_perform(curl);
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curl_easy_cleanup(curl);
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}
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.fi
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.SH AVAILABILITY
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Added in 7.61.0 for OpenSSL. Available when built with OpenSSL >= 1.1.1.
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Added in 7.85.0 for Schannel.
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.SH RETURN VALUE
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Returns CURLE_OK if supported, CURLE_NOT_BUILT_IN otherwise.
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.SH "SEE ALSO"
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.BR CURLOPT_SSL_CIPHER_LIST "(3), " CURLOPT_SSLVERSION "(3), "
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.BR CURLOPT_PROXY_SSL_CIPHER_LIST "(3), " CURLOPT_PROXY_TLS13_CIPHERS "(3), "
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.BR CURLOPT_PROXY_SSLVERSION "(3), " CURLOPT_USE_SSL "(3), "
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