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CURLOPT_CRLFILE(3)                  libcurl                 CURLOPT_CRLFILE(3)


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 * 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 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 CURLOPT_CRLFILE(3) will imply CURLSSLOPT_NO_PARTIALCHAIN (see
       CURLOPT_SSL_OPTIONS(3)) 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) 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

       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);
       }


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_SSL_VERIFYPEER(3), CURLOPT_SSL_VERIFYHOST(3),
       CURLOPT_PROXY_CRLFILE(3),

ibcurl 8.1.2                    April 26, 2023              CURLOPT_CRLFILE(3)

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