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https://github.com/moparisthebest/curl
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54e7475016
- Disable auto credentials by default. This is a breaking change for clients that are using it, wittingly or not. - New libcurl ssl option value CURLSSLOPT_AUTO_CLIENT_CERT tells libcurl to automatically locate and use a client certificate for authentication, when requested by the server. - New curl tool options --ssl-auto-client-cert and --proxy-ssl-auto-client-cert map to CURLSSLOPT_AUTO_CLIENT_CERT. This option is only supported for Schannel (the native Windows SSL library). Prior to this change Schannel would, with no notification to the client, attempt to locate a client certificate and send it to the server, when requested by the server. Since the server can request any certificate that supports client authentication in the OS certificate store it could be a privacy violation and unexpected. Fixes https://github.com/curl/curl/issues/2262 Reported-by: Jeroen Ooms Assisted-by: Wes Hinsley Assisted-by: Rich FitzJohn Ref: https://curl.se/mail/lib-2021-02/0066.html Reported-by: Morten Minde Neergaard Closes https://github.com/curl/curl/pull/6673
90 lines
4.1 KiB
Groff
90 lines
4.1 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 - 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.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_PROXY_SSL_OPTIONS 3 "16 Nov 2016" "libcurl 7.52.0" "curl_easy_setopt options"
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.SH NAME
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CURLOPT_PROXY_SSL_OPTIONS \- set proxy 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_PROXY_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_AUTO_CLIENT_CERT
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Tell libcurl to automatically locate and use a client certificate for
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authentication, when requested by the server. This option is only supported
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for Schannel (the native Windows SSL library). Prior to 7.77.0 this was the
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default behavior in libcurl with Schannel. Since the server can request any
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certificate that supports client authentication in the OS certificate store it
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could be a privacy violation and unexpected.
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(Added in 7.77.0)
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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 AVAILABLE
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Added in 7.52.0
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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_PROXY, "https://proxy");
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/* weaken TLS only for use with silly proxies */
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curl_easy_setopt(curl, CURLOPT_PROXY_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 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_PROXY_SSLVERSION "(3), " CURLOPT_PROXY_SSL_CIPHER_LIST "(3), "
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.BR CURLOPT_SSLVERSION "(3), " CURLOPT_SSL_CIPHER_LIST "(3), "
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