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* 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.
89 lines
3.6 KiB
Groff
89 lines
3.6 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 - 2016, 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_PROXY_SSL_VERIFYHOST 3 "16 Nov 2016" "libcurl 7.51.1" "curl_easy_setopt options"
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.SH NAME
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CURLOPT_PROXY_SSL_VERIFYHOST \- verify the proxy certificate's name against host
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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_VERIFYHOST, long verify);
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.SH DESCRIPTION
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TODO: Make this text specific to HTTPS proxy. (Added in 7.XXX)
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Pass a long as parameter specifying what to \fIverify\fP.
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This option determines whether libcurl verifies that the server cert is for
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the server it is known as.
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When negotiating TLS and SSL connections, the server sends a certificate
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indicating its identity.
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When \fICURLOPT_SSL_VERIFYHOST(3)\fP is 2, that certificate must indicate that
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the server is the server to which you meant to connect, or the connection
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fails. Simply put, it means it has to have the same name in the certificate as
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is in the URL you operate against.
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Curl considers the server the intended one when the Common Name field or a
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Subject Alternate Name field in the certificate matches the host name in the
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URL to which you told Curl to connect.
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When the \fIverify\fP value is 1, \fIcurl_easy_setopt\fP will return an error
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and the option value will not be changed. It was previously (in 7.28.0 and
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earlier) a debug option of some sorts, but it is no longer supported due to
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frequently leading to programmer mistakes. Future versions will stop returning
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an error for 1 and just treat 1 and 2 the same.
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When the \fIverify\fP value is 0, the connection succeeds regardless of the
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names in the certificate. Use that ability with caution!
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The default value for this option is 2.
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This option controls checking the server's certificate's claimed identity.
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The server could be lying. To control lying, see
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\fICURLOPT_SSL_VERIFYPEER(3)\fP. If libcurl is built against NSS and
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\fICURLOPT_SSL_VERIFYPEER(3)\fP is zero, \fICURLOPT_SSL_VERIFYHOST(3)\fP is
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also set to zero and cannot be overridden.
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.SH DEFAULT
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2
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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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/* Set the default value: strict name check please */
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curl_easy_setopt(curl, CURLOPT_PROXY_SSL_VERIFYHOST, 2L);
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curl_easy_perform(curl);
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}
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.fi
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.SH AVAILABILITY
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If built TLS enabled.
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.SH RETURN VALUE
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Returns CURLE_OK if TLS is supported, and CURLE_UNKNOWN_OPTION if not.
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If 1 is set as argument, \fICURLE_BAD_FUNCTION_ARGUMENT\fP is returned.
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.SH "SEE ALSO"
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.BR CURLOPT_SSL_VERIFYPEER "(3), " CURLOPT_CAINFO "(3), "
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