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.TH CURLOPT_PROXY_SSL_OPTIONS 3 "February 27, 2021" "libcurl 7.77.0" "curl_easy_setopt options"
.SH NAME
CURLOPT_PROXY_SSL_OPTIONS \- set proxy SSL behavior options
.SH SYNOPSIS
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXY_SSL_OPTIONS, long bitmask);
.SH DESCRIPTION
Pass a long with a bitmask to tell libcurl about specific SSL
behaviors. Available bits:
.IP CURLSSLOPT_ALLOW_BEAST
Tells libcurl to not attempt to use any workarounds for a security flaw in the
SSL3 and TLS1.0 protocols. If this option isn't used or this bit is set to 0,
the SSL layer libcurl uses may use a work-around for this flaw although it
might cause interoperability problems with some (older) SSL
implementations. WARNING: avoiding this work-around lessens the security, and
by setting this option to 1 you ask for exactly that. This option is only
supported for Secure Transport, NSS and OpenSSL.
.IP CURLSSLOPT_NO_REVOKE
Tells libcurl to disable certificate revocation checks for those SSL backends
where such behavior is present. This option is only supported for Schannel
(the native Windows SSL library), with an exception in the case of Windows'
Untrusted Publishers block list which it seems can't be bypassed. (Added in
7.44.0)
.IP CURLSSLOPT_NO_PARTIALCHAIN
Tells libcurl to not accept "partial" certificate chains, which it otherwise
does by default. This option is only supported for OpenSSL and will fail the
certificate verification if the chain ends with an intermediate certificate
and not with a root cert. (Added in 7.68.0)
.IP CURLSSLOPT_REVOKE_BEST_EFFORT
Tells libcurl to ignore certificate revocation checks in case of missing or
offline distribution points for those SSL backends where such behavior is
present. This option is only supported for Schannel (the native Windows SSL
library). If combined with \fICURLSSLOPT_NO_REVOKE\fP, the latter takes
precedence. (Added in 7.70.0)
.IP CURLSSLOPT_AUTO_CLIENT_CERT
Tell libcurl to automatically locate and use a client certificate for
authentication, when requested by the server. This option is only supported
for Schannel (the native Windows SSL library). Prior to 7.77.0 this was the
default behavior in libcurl with Schannel. Since the server can request any
certificate that supports client authentication in the OS certificate store it
could be a privacy violation and unexpected.
(Added in 7.77.0)
.SH DEFAULT
0
.SH PROTOCOLS
All TLS-based protocols
.SH AVAILABLE
Added in 7.52.0
.SH EXAMPLE
.nf
CURL *curl = curl_easy_init();
if(curl) {
curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
curl_easy_setopt(curl, CURLOPT_PROXY, "https://proxy");
/* weaken TLS only for use with silly proxies */
curl_easy_setopt(curl, CURLOPT_PROXY_SSL_OPTIONS, CURLSSLOPT_ALLOW_BEAST |
CURLSSLOPT_NO_REVOKE);
ret = curl_easy_perform(curl);
curl_easy_cleanup(curl);
}
.fi
.SH RETURN VALUE
Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
.SH "SEE ALSO"
.BR CURLOPT_PROXY_SSLVERSION "(3), " CURLOPT_PROXY_SSL_CIPHER_LIST "(3), "
.BR CURLOPT_SSLVERSION "(3), " CURLOPT_SSL_CIPHER_LIST "(3), "
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