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deps/curl/docs/libcurl/opts/CURLOPT_CRLFILE.md

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+---
+c: Copyright (C) Daniel Stenberg, <daniel.se>, et al.
+SPDX-License-Identifier: curl
+Title: CURLOPT_CRLFILE
+Section: 3
+Source: libcurl
+See-also:
+  - CURLOPT_PROXY_CRLFILE (3)
+  - CURLOPT_SSL_VERIFYHOST (3)
+  - CURLOPT_SSL_VERIFYPEER (3)
+---
+
+# NAME
+
+CURLOPT_CRLFILE - Certificate Revocation List file
+
+# SYNOPSIS
+
+~~~c
+#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) implies **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
+
+~~~c
+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.