roundcube-defense/defense.php

149 lines
4.8 KiB
PHP

<?php
/*
* This file is part of the Roundcube plugin: roundcube-defense.
*
* @author Steve Allison <roundcube-defense@nooblet.org>
*
* roundcube-defense is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* roundcube-defense is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with roundcube-defense. If not, see <http://www.gnu.org/licenses/>.
*/
class defense extends rcube_plugin {
// Roundcube parent class
private $rc;
// Config variables
private $whitelist, $blacklist, $fail_max,
$fail_reset, $ban_period, $repeat_multiplier,
$repeat_reset, $db_table, $db_expire, $log_pwd;
// Remote client IP address
private $ipaddr;
/**
* Check if IP is matched against all IPs in array,
* including CIDR matches
*
* @param string ip address
* @param array ip/cidr addresses to match against
* @return bool
*/
private function isIPinArray($ip, $array) {
foreach ($array as $value) {
if ((strpos($value, '/') === false) && ($ip == $value)) { return true; }
if ($this->isIPinCIDR($ip, $value)) { return true; }
}
return false;
}
/**
* Check if IP is within stated CIDR address
*
* @param string ip address
* @param string cidr address
* @return bool
*/
private function isIPinCIDR($ip, $cidr) {
list($subnet, $mask) = explode('/', $cidr);
return ((ip2long($ip) & ~((1 << (32 - $mask)) - 1) ) == ip2long($subnet));
}
/**
* Contructor, initialization
*
*/
public function init() {
// create parent class
$this->rc = rcube::get_instance();
// load configuration
$this->load_config();
// set config variables, set defaults
$this->db_table = $this->rc->config->get('defense_db_table', 'defense');
$this->fail_max = $this->rc->config->get('defense_fail_max', 5);
$this->fail_reset = $this->rc->config->get('defense_fail_reset', 600);
$this->ban_period = $this->rc->config->get('defense_ban_period', 120);
$this->ban_httpstatus = $this->rc->config->get('defense_ban_httpstatus', false);
$this->repeat_multiplier = $this->rc->config->get('defense_repeat_multiplier', 4);
$this->repeat_reset = $this->rc->config->get('defense_repeat_reset', 86400);
$this->db_expire = $this->rc->config->get('defense_db_expire', 40);
$this->log_pwd = $this->rc->config->get('defense_log_pwd', false);
// set client ip
$this->ipaddr = rcmail_remote_ip();
// Roundcube event hooks
$this->add_hook('template_object_loginform', array($this, 'hookLoginForm'));
$this->add_hook('authenticate', array($this, 'hookAuthenticate'));
$this->add_hook('login_failed', array($this, 'hookLoginFailed'));
}
/**
* Hooked function: login_form($content)
* Process whitelist and blacklist
*
* @param string Login form HTML
* @return string Login form HTML
*/
public function hookLoginForm($content) {
// set config variables, set defaults
$this->whitelist = $this->rc->config->get('defense_whitelist', array('127.0.0.1'));
$this->blacklist = $this->rc->config->get('defense_blacklist', array());
// If IP is listed in whitelist, return unmodified $content
if ($this->isIPinArray($this->ipaddr, $this->whitelist)) {
return $content;
}
// If IP is listed in blacklist, deny access
if ($this->isIPinArray($this->ipaddr, $this->blacklist)) {
header('HTTP/1.1 403 Forbidden');
die();
}
}
/**
* Hooked function: authenticate($host, $user, $cookiecheck, $valid)
* Login attempt intercepted if IP is banned.
*
* @param var (untouched)
* @return var (untouched)
*/
public function hookAuthenticate($args) {
return $args
}
/**
* Hooked function: login_failed($host, $user, $code)
* Log event to database
*
* @param string host
* @param string user
* @param int code
*
*/
public function hookLoginFailed($host, $user, $code) {
$query = "INSERT INTO " . $this->db_table . " (timestamp, type, src, data) VALUES (" . time() . ", 'fail', " . ip2long($this->ipaddr) . ", 'data')";
print $query;
}
}
?>