/usr/share/roundcube/plugins/fail2ban/fail2ban.php is in roundcube-plugins-extra 0.7-20120110.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 | <?php
/**
 * RoundCube Fail2Ban Plugin
 *
 * @version 1.1
 * @author Matt Rude [m@mattrude.com]
 * @url http://mattrude.com/plugins/roundcube-fail2ban-plugin/
 * @license GPLv3
 */
class fail2ban extends rcube_plugin
{
  function init()
  {
    $this->add_hook('login_failed', array($this, 'log'));
  }
  function log($args)
  {
    $log_entry = 'FAILED login for ' .$args['user']. ' from ' .getenv('REMOTE_ADDR'); 
    $log_config = rcmail::get_instance()->config->get('log_driver');
    
    if ($log_config == 'syslog'){
       syslog(LOG_WARNING, $log_entry);
    } elseif ($log_config == 'file'){
       error_log('['.date('d-M-Y H:i:s O')."]: ".$log_entry."\n", 3, "logs/userlogins");
    } else {
       echo 'WARNING!! The RoundCube Fail2Ban Plugin was unable to retrieve the log driver from the config, please check your config file for log_driver.';
    }
  }
}
?>
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