DragonFly On-Line Manual Pages
CURLOPT_CRLFILE(3) curl_easy_setopt options CURLOPT_CRLFILE(3)
CURLOPT_CRLFILE - Certificate Revocation List file
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_CRLFILE, char *file);
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
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
The application does not have to keep the string around after setting
All TLS-based protocols
CURL *curl = curl_easy_init();
curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
curl_easy_setopt(curl, CURLOPT_CRLFILE, "/etc/certs/crl.pem");
ret = curl_easy_perform(curl);
Added in 7.19.0
Returns CURLE_OK if the option is supported, CURLE_UNKNOWN_OPTION if
not, or CURLE_OUT_OF_MEMORY if there was insufficient heap space.
libcurl 7.87.0 May 17, 2022 CURLOPT_CRLFILE(3)