CURLOPT_CRLFILE(3) curl_easy_setopt options 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 con-
catenation 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 CUR-
LOPT_SSL_VERIFYPEER(3) option.
A specific error code (CURLE_SSL_CRL_BADFILE) is defined with the op-
tion. It is returned when the SSL exchange fails because the CRL file
cannot be loaded. A failure in certificate verification due to a revo-
cation information found in the CRL does not trigger this specific er-
ror.
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), CUR-
LOPT_PROXY_CRLFILE(3),
libcurl 7.81.0 November 26, 2021 CURLOPT_CRLFILE(3)
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