2024-03-15 20:55:33 -06:00
|
|
|
.\" generated by cd2nroff 0.1 from CURLOPT_SSL_VERIFYPEER.md
|
2024-07-29 18:00:04 -06:00
|
|
|
.TH CURLOPT_SSL_VERIFYPEER 3 "2024-07-29" libcurl
|
2024-03-15 20:55:33 -06:00
|
|
|
.SH NAME
|
|
|
|
|
CURLOPT_SSL_VERIFYPEER \- verify the peer\(aqs SSL certificate
|
|
|
|
|
.SH SYNOPSIS
|
|
|
|
|
.nf
|
|
|
|
|
#include <curl/curl.h>
|
|
|
|
|
|
|
|
|
|
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SSL_VERIFYPEER, long verify);
|
|
|
|
|
.fi
|
|
|
|
|
.SH DESCRIPTION
|
|
|
|
|
Pass a long as parameter to enable or disable.
|
|
|
|
|
|
|
|
|
|
This option determines whether curl verifies the authenticity of the peer\(aqs
|
|
|
|
|
certificate. A value of 1 means curl verifies; 0 (zero) means it does not.
|
|
|
|
|
|
|
|
|
|
When negotiating a TLS or SSL connection, the server sends a certificate
|
|
|
|
|
indicating its identity. Curl verifies whether the certificate is authentic,
|
|
|
|
|
i.e. that you can trust that the server is who the certificate says it is.
|
|
|
|
|
This trust is based on a chain of digital signatures, rooted in certification
|
|
|
|
|
authority (CA) certificates you supply. curl uses a default bundle of CA
|
|
|
|
|
certificates (the path for that is determined at build time) and you can
|
|
|
|
|
specify alternate certificates with the \fICURLOPT_CAINFO(3)\fP option or the
|
|
|
|
|
\fICURLOPT_CAPATH(3)\fP option.
|
|
|
|
|
|
|
|
|
|
When \fICURLOPT_SSL_VERIFYPEER(3)\fP is enabled, and the verification fails to
|
|
|
|
|
prove that the certificate is signed by a CA, the connection fails.
|
|
|
|
|
|
|
|
|
|
When this option is disabled (set to zero), the CA certificates are not loaded
|
|
|
|
|
and the peer certificate verification is simply skipped.
|
|
|
|
|
|
|
|
|
|
Authenticating the certificate is not enough to be sure about the server. You
|
|
|
|
|
typically also want to ensure that the server is the server you mean to be
|
|
|
|
|
talking to. Use \fICURLOPT_SSL_VERIFYHOST(3)\fP for that. The check that the host
|
|
|
|
|
name in the certificate is valid for the hostname you are connecting to is
|
|
|
|
|
done independently of the \fICURLOPT_SSL_VERIFYPEER(3)\fP option.
|
|
|
|
|
|
|
|
|
|
WARNING: disabling verification of the certificate allows bad guys to
|
|
|
|
|
man\-in\-the\-middle the communication without you knowing it. Disabling
|
|
|
|
|
verification makes the communication insecure. Just having encryption on a
|
|
|
|
|
transfer is not enough as you cannot be sure that you are communicating with
|
|
|
|
|
the correct end\-point.
|
|
|
|
|
|
|
|
|
|
When libcurl uses secure protocols it trusts responses and allows for example
|
|
|
|
|
HSTS and Alt\-Svc information to be stored and used subsequently. Disabling
|
|
|
|
|
certificate verification can make libcurl trust and use such information from
|
|
|
|
|
malicious servers.
|
|
|
|
|
.SH DEFAULT
|
|
|
|
|
1 \- enabled
|
|
|
|
|
.SH PROTOCOLS
|
2024-07-29 18:00:04 -06:00
|
|
|
This functionality affects all TLS based protocols: HTTPS, FTPS, IMAPS, POP3S, SMTPS etc.
|
2024-03-30 12:28:04 -06:00
|
|
|
|
|
|
|
|
All TLS backends support this option.
|
2024-03-15 20:55:33 -06:00
|
|
|
.SH EXAMPLE
|
|
|
|
|
.nf
|
|
|
|
|
int main(void)
|
|
|
|
|
{
|
|
|
|
|
CURL *curl = curl_easy_init();
|
|
|
|
|
if(curl) {
|
|
|
|
|
curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
|
|
|
|
|
|
|
|
|
|
/* Set the default value: strict certificate check please */
|
|
|
|
|
curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 1L);
|
|
|
|
|
|
|
|
|
|
curl_easy_perform(curl);
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
.fi
|
|
|
|
|
.SH AVAILABILITY
|
2024-07-29 18:00:04 -06:00
|
|
|
Added in curl 7.4.2
|
2024-03-15 20:55:33 -06:00
|
|
|
.SH RETURN VALUE
|
|
|
|
|
Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
|
|
|
|
|
.SH SEE ALSO
|
|
|
|
|
.BR CURLINFO_CAINFO (3),
|
|
|
|
|
.BR CURLINFO_CAPATH (3),
|
|
|
|
|
.BR CURLOPT_CAINFO (3),
|
|
|
|
|
.BR CURLOPT_PROXY_SSL_VERIFYHOST (3),
|
|
|
|
|
.BR CURLOPT_PROXY_SSL_VERIFYPEER (3),
|
|
|
|
|
.BR CURLOPT_SSL_VERIFYHOST (3)
|
