---
name: "CURLOPT_CRLFILE"
section: "3"
platform: "macos"
package: "curl"
version: "166.0.0.0.1"
release: "macOS 26.5"
platforms: ["linux", "macos"]
url: "https://new.carta.tech/CURLOPT_CRLFILE"
---

# CURLOPT\_CRLFILE(3)

Certificate Revocation List file

## NAME

CURLOPT\_CRLFILE - Certificate Revocation List file

## SYNOPSIS

```
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_CRLFILE, char *file);
```

## DESCRIPTION

Pass a char pointer to a null-terminated string naming a *file* 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 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 *[CURLOPT\_CRLFILE(3)](/CURLOPT_CRLFILE/3.md)* implies **CURLSSLOPT\_NO\_PARTIALCHAIN** (see *[CURLOPT\_SSL\_OPTIONS(3)](/CURLOPT_SSL_OPTIONS/3.md)*) since curl 7.71.0 due to an OpenSSL bug.

This option makes sense only when used in combination with the *[CURLOPT\_SSL\_VERIFYPEER(3)](/CURLOPT_SSL_VERIFYPEER/3.md)* option.

A specific error code (*CURLE\_SSL\_CRL\_BADFILE*) 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.

## DEFAULT

NULL

## PROTOCOLS

All TLS-based protocols

## EXAMPLE

```
int main(void)
{
  CURL *curl = curl_easy_init();
  if(curl) {
    CURLcode res;
    curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
    curl_easy_setopt(curl, CURLOPT_CRLFILE, "/etc/certs/crl.pem");
    res = curl_easy_perform(curl);
    curl_easy_cleanup(curl);
  }
}
```

## AVAILABILITY

Added in 7.19.0

## 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.

## SEE ALSO

[**CURLOPT\_PROXY\_CRLFILE**(3)](/CURLOPT_PROXY_CRLFILE/3.md), [**CURLOPT\_SSL\_VERIFYHOST**(3)](/CURLOPT_SSL_VERIFYHOST/3.md), [**CURLOPT\_SSL\_VERIFYPEER**(3)](/CURLOPT_SSL_VERIFYPEER/3.md)