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.TH CURLOPT_CRLFILE 3 "November 04, 2020" "libcurl 7.77.0" "curl_easy_setopt options"

.SH NAME
CURLOPT_CRLFILE \- specify a Certificate Revocation List file
.SH SYNOPSIS
#include <curl/curl.h>

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_CRLFILE, char *file);
.SH DESCRIPTION
Pass a char * to a null-terminated string naming a \fIfile\fP with the
concatenation of CRL (in PEM format) to use in the certificate validation that
occurs during the SSL exchange.

When curl is built to use NSS or GnuTLS, there is no way to influence the use
of CRL passed to help in the verification process.

When libcurl is built with OpenSSL support, X509_V_FLAG_CRL_CHECK and
X509_V_FLAG_CRL_CHECK_ALL are both set, requiring CRL check against all the
elements of the certificate chain if a CRL file is passed. Also note that
\fICURLOPT_CRLFILE(3)\fP will imply \fBCURLSSLOPT_NO_PARTIALCHAIN\fP (see
\fICURLOPT_SSL_OPTIONS(3)\fP) since curl 7.71.0 due to an OpenSSL bug.

This option makes sense only when used in combination with the
\fICURLOPT_SSL_VERIFYPEER(3)\fP option.

A specific error code (\fICURLE_SSL_CRL_BADFILE\fP) is defined with the
option. It is returned when the SSL exchange fails because the CRL file cannot
be loaded.  A failure in certificate verification due to a revocation
information found in the CRL does not trigger this specific error.

The application does not have to keep the string around after setting this
option.
.SH DEFAULT
NULL
.SH PROTOCOLS
All TLS-based protocols
.SH EXAMPLE
.nf
CURL *curl = curl_easy_init();
if(curl) {
  curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
  curl_easy_setopt(curl, CURLOPT_CRLFILE, "/etc/certs/crl.pem");
  ret = curl_easy_perform(curl);
  curl_easy_cleanup(curl);
}
.fi
.SH AVAILABILITY
Added in 7.19.0
.SH RETURN VALUE
Returns CURLE_OK if the option is supported, CURLE_UNKNOWN_OPTION if not, or
CURLE_OUT_OF_MEMORY if there was insufficient heap space.
.SH "SEE ALSO"
.BR CURLOPT_SSL_VERIFYPEER "(3), " CURLOPT_SSL_VERIFYHOST "(3), "
.BR CURLOPT_PROXY_CRLFILE "(3), "
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