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84 lines
3.1 KiB
Groff
84 lines
3.1 KiB
Groff
.\" generated by cd2nroff 0.1 from CURLOPT_DOH_SSL_VERIFYPEER.md
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.TH CURLOPT_DOH_SSL_VERIFYPEER 3 "2024-06-01" libcurl
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.SH NAME
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CURLOPT_DOH_SSL_VERIFYPEER \- verify the DoH SSL certificate
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.SH SYNOPSIS
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.nf
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#include <curl/curl.h>
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CURLcode curl_easy_setopt(CURL *handle, CURLOPT_DOH_SSL_VERIFYPEER,
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long verify);
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.fi
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.SH DESCRIPTION
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Pass a long as parameter set to 1L to enable or 0L to disable.
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This option tells curl to verify the authenticity of the DoH (DNS\-over\-HTTPS)
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server\(aqs certificate. A value of 1 means curl verifies; 0 (zero) means it
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does not.
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This option is the DoH equivalent of \fICURLOPT_SSL_VERIFYPEER(3)\fP and
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only affects requests to the DoH server.
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When negotiating a TLS or SSL connection, the server sends a certificate
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indicating its identity. Curl verifies whether the certificate is authentic,
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i.e. that you can trust that the server is who the certificate says it is.
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This trust is based on a chain of digital signatures, rooted in certification
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authority (CA) certificates you supply. curl uses a default bundle of CA
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certificates (the path for that is determined at build time) and you can
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specify alternate certificates with the \fICURLOPT_CAINFO(3)\fP option or the
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\fICURLOPT_CAPATH(3)\fP option.
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When \fICURLOPT_DOH_SSL_VERIFYPEER(3)\fP is enabled, and the verification fails to
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prove that the certificate is authentic, the connection fails. When the option
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is zero, the peer certificate verification succeeds regardless.
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Authenticating the certificate is not enough to be sure about the server. You
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typically also want to ensure that the server is the server you mean to be
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talking to. Use \fICURLOPT_DOH_SSL_VERIFYHOST(3)\fP for that. The check that the
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hostname in the certificate is valid for the hostname you are connecting to
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is done independently of the \fICURLOPT_DOH_SSL_VERIFYPEER(3)\fP option.
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WARNING: disabling verification of the certificate allows bad guys to
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man\-in\-the\-middle the communication without you knowing it. Disabling
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verification makes the communication insecure. Just having encryption on a
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transfer is not enough as you cannot be sure that you are communicating with
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the correct end\-point.
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.SH DEFAULT
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1
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.SH PROTOCOLS
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All TLS based protocols: HTTPS, FTPS, IMAPS, POP3S, SMTPS etc.
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All TLS backends support this option.
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.SH EXAMPLE
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.nf
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int main(void)
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{
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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_DOH_URL,
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"https://cloudflare-dns.com/dns-query");
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/* Disable certificate verification of the DoH server */
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curl_easy_setopt(curl, CURLOPT_DOH_SSL_VERIFYPEER, 0L);
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curl_easy_perform(curl);
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}
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}
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.fi
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.SH AVAILABILITY
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Added in 7.76.0
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If built TLS enabled.
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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_CAINFO (3),
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.BR CURLOPT_CAPATH (3),
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.BR CURLOPT_DOH_SSL_VERIFYHOST (3),
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.BR CURLOPT_PROXY_SSL_VERIFYHOST (3),
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.BR CURLOPT_PROXY_SSL_VERIFYPEER (3),
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.BR CURLOPT_SSL_VERIFYHOST (3),
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.BR CURLOPT_SSL_VERIFYPEER (3)
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