curl/docs/libcurl/opts/CURLOPT_PROXY_SSL_OPTIONS.3

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proxy: Support HTTPS proxy and SOCKS+HTTP(s) * HTTPS proxies: An HTTPS proxy receives all transactions over an SSL/TLS connection. Once a secure connection with the proxy is established, the user agent uses the proxy as usual, including sending CONNECT requests to instruct the proxy to establish a [usually secure] TCP tunnel with an origin server. HTTPS proxies protect nearly all aspects of user-proxy communications as opposed to HTTP proxies that receive all requests (including CONNECT requests) in vulnerable clear text. With HTTPS proxies, it is possible to have two concurrent _nested_ SSL/TLS sessions: the "outer" one between the user agent and the proxy and the "inner" one between the user agent and the origin server (through the proxy). This change adds supports for such nested sessions as well. A secure connection with a proxy requires its own set of the usual SSL options (their actual descriptions differ and need polishing, see TODO): --proxy-cacert FILE CA certificate to verify peer against --proxy-capath DIR CA directory to verify peer against --proxy-cert CERT[:PASSWD] Client certificate file and password --proxy-cert-type TYPE Certificate file type (DER/PEM/ENG) --proxy-ciphers LIST SSL ciphers to use --proxy-crlfile FILE Get a CRL list in PEM format from the file --proxy-insecure Allow connections to proxies with bad certs --proxy-key KEY Private key file name --proxy-key-type TYPE Private key file type (DER/PEM/ENG) --proxy-pass PASS Pass phrase for the private key --proxy-ssl-allow-beast Allow security flaw to improve interop --proxy-sslv2 Use SSLv2 --proxy-sslv3 Use SSLv3 --proxy-tlsv1 Use TLSv1 --proxy-tlsuser USER TLS username --proxy-tlspassword STRING TLS password --proxy-tlsauthtype STRING TLS authentication type (default SRP) All --proxy-foo options are independent from their --foo counterparts, except --proxy-crlfile which defaults to --crlfile and --proxy-capath which defaults to --capath. Curl now also supports %{proxy_ssl_verify_result} --write-out variable, similar to the existing %{ssl_verify_result} variable. Supported backends: OpenSSL, GnuTLS, and NSS. * A SOCKS proxy + HTTP/HTTPS proxy combination: If both --socks* and --proxy options are given, Curl first connects to the SOCKS proxy and then connects (through SOCKS) to the HTTP or HTTPS proxy. TODO: Update documentation for the new APIs and --proxy-* options. Look for "Added in 7.XXX" marks.
2016-11-16 12:49:15 -05:00
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.TH CURLOPT_PROXY_SSL_OPTIONS 3 "16 Nov 2016" "libcurl 7.51.1" "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
TODO: Make this text specific to HTTPS proxy. (Added in 7.XXX)
Pass a long with a bitmask to tell libcurl about specific SSL behaviors.
\fICURLSSLOPT_ALLOW_BEAST\fP 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 DarwinSSL, NSS and OpenSSL.
Added in 7.44.0:
\fICURLSSLOPT_NO_REVOKE\fP tells libcurl to disable certificate revocation
checks for those SSL backends where such behavior is present. \fBCurrently this
option is only supported for WinSSL (the native Windows SSL library), with an
exception in the case of Windows' Untrusted Publishers blacklist which it seems
can't be bypassed.\fP This option may have broader support to accommodate other
SSL backends in the future.
https://curl.haxx.se/docs/ssl-compared.html
.SH DEFAULT
0
.SH PROTOCOLS
All TLS-based protocols
.SH EXAMPLE
TODO
.SH RETURN VALUE
Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
.SH "SEE ALSO"
.BR CURLOPT_SSLVERSION "(3), " CURLOPT_SSL_CIPHER_LIST "(3), "