private void updateAuthorityConfig(UserCertificateModel ucm) {
   File certificatesConfigFile = new File(folder, X509Utils.CA_CONFIG);
   FileBasedConfig config = new FileBasedConfig(certificatesConfigFile, FS.detect());
   if (certificatesConfigFile.exists()) {
     try {
       config.load();
     } catch (Exception e) {
       Utils.showException(GitblitAuthority.this, e);
     }
   }
   ucm.update(config);
   try {
     config.save();
   } catch (Exception e) {
     Utils.showException(GitblitAuthority.this, e);
   }
 }