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In DarwinSSL the SSLSetPeerDomainName function is used to enable both sending SNI and verifying the host. When host verification is disabled the function cannot be called, therefore SNI is disabled as well. Closes https://github.com/curl/curl/pull/1240
95 lines
3.8 KiB
Groff
95 lines
3.8 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 - 2015, 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_VERIFYHOST 3 "17 Jun 2014" "libcurl 7.37.0" "curl_easy_setopt options"
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.SH NAME
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CURLOPT_SSL_VERIFYHOST \- verify the 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_SSL_VERIFYHOST, long verify);
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.SH DESCRIPTION
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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.
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.SH LIMITATIONS
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DarwinSSL: If \fIverify\fP value is 0, then SNI is also disabled. SNI is a TLS
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extension that sends the hostname to the server. The server may use that
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information to do such things as sending back a specific certificate for the
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hostname, or forwarding the request to a specific origin server. Some hostnames
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may be inaccessible if SNI is not sent.
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NSS: If \fICURLOPT_SSL_VERIFYPEER(3)\fP is zero,
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\fICURLOPT_SSL_VERIFYHOST(3)\fP is 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_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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