discard certificate with unknown critical extensions

src/libstrongswan/plugins/x509/x509_cert.c

@@ -905,6 +905,14 @@ static bool parse_certificate(private_x509_cert_t *this)
 						}
 						break;
 					default:
+						if (critical && lib->settings->get_bool(lib->settings,
+							"libstrongswan.plugins.x509_cert.enforce_critical", FALSE))
+						{
+							DBG1("critical %s extension not supported",
+								 (extn_oid == OID_UNKNOWN) ? "unknown" :
+								 (char*)oid_names[extn_oid].name); 
+							goto end;
+						}
 						break;
 				}
 				break;