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86 lines
3.7 KiB
86 lines
3.7 KiB
4 months ago
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.\" **************************************************************************
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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 - 2020, 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_SSL_OPTIONS 3 "July 16, 2020" "libcurl 7.73.0" "curl_easy_setopt options"
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.SH NAME
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CURLOPT_SSL_OPTIONS \- set SSL behavior options
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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_SSL_OPTIONS, long bitmask);
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.SH DESCRIPTION
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Pass a long with a bitmask to tell libcurl about specific SSL
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behaviors. Available bits:
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.IP CURLSSLOPT_ALLOW_BEAST
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Tells libcurl to not attempt to use any workarounds for a security flaw in the
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SSL3 and TLS1.0 protocols. If this option isn't used or this bit is set to 0,
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the SSL layer libcurl uses may use a work-around for this flaw although it
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might cause interoperability problems with some (older) SSL
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implementations. WARNING: avoiding this work-around lessens the security, and
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by setting this option to 1 you ask for exactly that. This option is only
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supported for Secure Transport, NSS and OpenSSL.
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.IP CURLSSLOPT_NO_REVOKE
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Tells libcurl to disable certificate revocation checks for those SSL backends
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where such behavior is present. This option is only supported for Schannel
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(the native Windows SSL library), with an exception in the case of Windows'
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Untrusted Publishers block list which it seems can't be bypassed. (Added in
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7.44.0)
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.IP CURLSSLOPT_NO_PARTIALCHAIN
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Tells libcurl to not accept "partial" certificate chains, which it otherwise
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does by default. This option is only supported for OpenSSL and will fail the
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certificate verification if the chain ends with an intermediate certificate
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and not with a root cert. (Added in 7.68.0)
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.IP CURLSSLOPT_REVOKE_BEST_EFFORT
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Tells libcurl to ignore certificate revocation checks in case of missing or
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offline distribution points for those SSL backends where such behavior is
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present. This option is only supported for Schannel (the native Windows SSL
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library). If combined with \fICURLSSLOPT_NO_REVOKE\fP, the latter takes
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precedence. (Added in 7.70.0)
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.IP CURLSSLOPT_NATIVE_CA
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Tell libcurl to use the operating system's native CA store for certificate
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verification. Works only on Windows when built to use OpenSSL. This option is
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experimental and behavior is subject to change.
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(Added in 7.71.0)
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.SH DEFAULT
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0
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.SH PROTOCOLS
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All TLS-based protocols
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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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/* weaken TLS only for use with silly servers */
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curl_easy_setopt(curl, CURLOPT_SSL_OPTIONS, CURLSSLOPT_ALLOW_BEAST |
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CURLSSLOPT_NO_REVOKE);
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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 7.25.0
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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_SSLVERSION "(3), " CURLOPT_SSL_CIPHER_LIST "(3), "
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