424 lines
15 KiB
PHP
424 lines
15 KiB
PHP
<?php
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/*
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* This file is part of the Roundcube plugin: roundcube-defense.
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*
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* @author Steve Allison <roundcube-defense@nooblet.org>
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*
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* roundcube-defense is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* roundcube-defense is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with roundcube-defense. If not, see <http://www.gnu.org/licenses/>.
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*/
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class defense extends rcube_plugin {
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// Roundcube parent class
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private $rc;
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// Config variables
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private $whitelist, $blacklist, $fail_max,
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$fail_reset, $ban_period, $repeat_multiplier,
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$repeat_reset, $db_table, $db_expire, $log_pwd;
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// Remote client IP address
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private $ipaddr;
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// Previous ban data
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private $prevBan;
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// Debug log
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private $logfile = 'defense.log';
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private $debugEnabled;
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/**
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* Output text to log file: $this->logfile
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*
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* @param string
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* text for log
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*/
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private function debug($string) {
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if (!$this->debugEnabled) { return; }
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write_log($this->logfile, $this->ipaddr . " # " . $string);
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}
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/**
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* Check if IP is matched against all IPs in array,
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* including CIDR matches
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*
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* @param string
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* ip address
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* @param array
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* ip/cidr addresses to match against
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* @return bool
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*/
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private function isIPinArray($ip, $array) {
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foreach ($array as $value) {
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// If no slash '/' then its not a CIDR address and we can just string match
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if ((strpos($value, '/') === false) && (strcmp($ip, $value) == 0)) { return true; }
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if (($this->isIPv6($ip)) && (!$this->isIPv6($value))) { return false; }
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if (($this->isIPv4($value)) && (!$this->isIPv4($ip))) { return false; }
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if (($this->isIPv4($ip) && ($this->isIPv4inCIDR($ip, $value)))) { return true; }
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if (($this->isIPv6($ip) && ($this->isIPv6inCIDR($ip, $value)))) { return true; }
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}
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return false;
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}
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/**
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* Check if IPv4 is within stated CIDR address
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*
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* @param string
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* ip address
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* @param string
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* cidr address
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* @return bool
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*/
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private function isIPv4inCIDR($ip, $cidr) {
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list($subnet, $mask) = explode('/', $cidr);
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return ((ip2long($ip) & ~((1 << (32 - $mask)) - 1) ) == ip2long($subnet));
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}
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/**
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* Convert IPv6 mask to bytearray
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*
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* @param string
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* subnet mask
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* @return string
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*/
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private function IPv6MaskToByteArray($subnetMask) {
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$addr = str_repeat("f", $subnetMask / 4);
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switch ($subnetMask % 4) {
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case 0:
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break;
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case 1:
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$addr .= "8";
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break;
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case 2:
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$addr .= "c";
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break;
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case 3:
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$addr .= "e";
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break;
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}
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$addr = str_pad($addr, 32, '0');
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$addr = pack("H*" , $addr);
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return $addr;
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}
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/**
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* Check if IPv6 is within stated CIDR address
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*
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* @param string
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* subnet mask
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* @return bool
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*/
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private function isIPv6inCIDR($ip, $cidr) {
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list($subnet, $mask) = explode('/', $cidr);
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$binMask = $this->IPv6MaskToByteArray($mask);
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return ($ip & $binMask) == $subnet;
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}
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/**
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* Check string if it is IPv6
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*
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* @param string
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* ip address
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* @return bool
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*/
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private function isIPv6($ip) {
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return (((!preg_match('/^[\.\/:0-9a-f]+$/', strtolower($ip))) || (substr_count($ip, ':') < 2)) ? true : false);
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}
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/**
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* Check string if it is IPv4
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*
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* @param string
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* ip address
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* @return bool
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*/
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private function isIPv4($ip) {
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return ((preg_match('/^([0-9]{1,3}\.){3}[0-9]{1,3}(\/[0-9]{1,2})?$/', $ip)) ? true : false);
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}
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/**
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* Write to log stating database error
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*
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*/
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private function dbError() {
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// I can't seem to try/catch database entries so I have no details regarding error
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$string = "Error communicating with database.";
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$this->debug($string);
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write_log('error', 'plugin::defense: ' . $string);
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}
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/**
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* Return true if IP matches config whitelist
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*
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* @param string
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* ip address
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* @return bool
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*/
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private function isWhitelisted($ip) {
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$this->whitelist = $this->rc->config->get('defense_whitelist', array('127.0.0.1'));
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// If IP is listed in whitelist, return true
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if ($this->isIPinArray($this->ipaddr, $this->whitelist)) {
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$this->debug("whitelisted");
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return $true;
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}
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return false;
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}
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/**
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* Return true if IP matches config blacklist
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*
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* @param string
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* ip address
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* @return bool
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*/
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private function isBlacklisted($ip) {
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$this->blacklist = $this->rc->config->get('defense_blacklist', array());
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// If IP is listed in blacklist, return true
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if ($this->isIPinArray($this->ipaddr, $this->blacklist)) {
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$this->debug("blacklisted");
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return $true;
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}
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return false;
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}
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/**
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* Send forbidden (403) HTTP status header and quit
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*
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*/
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private function sendForbiddenHeader() {
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if (headers_sent()) { return; } // Already sent, can't do this now
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header('HTTP/1.1 403 Forbidden');
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die();
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}
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/**
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* Fetch and return last ban for $ip
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*
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* @param string
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* ip address
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* @return mixed
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* Return array with record matched, or bool(false) if no match
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*/
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private function getPreviousBanData($ip) {
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// Use cached data if available.
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if ($this->prevBan) { return $this->prevBan; }
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$query = sprintf("SELECT * FROM %s WHERE ipaddr = '%s' AND type = %d ORDER BY id DESC LIMIT 1", $this->db_table, $ip, 1);
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$result = $this->rc->db->query($query);
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if (!$result) { $this->dbError($query); return false; }
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$this->debug($query . " [" . $result->rowCount() . "]");
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if ($result->rowCount() > 0) {
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// Set data to cache variable
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$this->prevBan = $result->fetch();
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}
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return $this->prevBan;
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}
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/**
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* Convert seconds to human readable duration
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*
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* @param int
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* duration in seconds
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* @return string
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* human readable duration, ie: 3d7h13m25s
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*/
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private function secs2hr($secs) {
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$s = $secs%60; $m = floor(($secs%3600)/60); $h = floor(($secs%86400)/3600); $d = floor(($secs%604800)/86400); $w = floor(($secs%31449600)/604800); $y = floor($secs/31449600);
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return (($y > 0) ? $y . "y" : "") . (($w > 0) ? $w . "w" : "") . (($d > 0) ? $d . "d" : "") . (($h > 0) ? $h . "h" : "") . (($m > 0) ? $m . "m" : "") . (($s > 0) ? $s . "s" : "");
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}
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/**
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* Constructor, initialization
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*
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*/
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public function init() {
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// create parent class
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$this->rc = rcube::get_instance();
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// load configuration
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$this->load_config();
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// Set localization (only for login pages)
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$this->add_texts('localization/', $this->rc->task == 'login');
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// set config variables, set defaults
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$this->db_table = $this->rc->config->get('defense_db_table', 'defense');
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$this->fail_max = $this->rc->config->get('defense_fail_max', 5);
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$this->fail_reset = $this->rc->config->get('defense_fail_reset', 600);
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$this->ban_period = $this->rc->config->get('defense_ban_period', 120);
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$this->ban_httpstatus = $this->rc->config->get('defense_ban_httpstatus', false);
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$this->repeat_multiplier = $this->rc->config->get('defense_repeat_multiplier', 4);
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$this->repeat_reset = $this->rc->config->get('defense_repeat_reset', 86400);
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$this->db_expire = $this->rc->config->get('defense_db_expire', 40);
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$this->log_pwd = $this->rc->config->get('defense_log_pwd', false);
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$this->debugEnabled = $this->rc->config->get('defense_debug_enabled', false);
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// set client ip
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$this->ipaddr = rcmail_remote_ip();
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// Roundcube event hooks
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$this->add_hook('template_object_loginform', array($this, 'hookLoginForm'));
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$this->add_hook('authenticate', array($this, 'hookAuthenticate'));
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$this->add_hook('login_failed', array($this, 'hookLoginFailed'));
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}
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/**
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* Hooked function: template_login_form(string)
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* http://trac.roundcube.net/wiki/Plugin_Hooks#TemplateHooks
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*
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* Process whitelist and blacklist
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*
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* @param string
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* Login form HTML content
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* @return string
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* Login form HTML content
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*/
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public function hookLoginForm($content) {
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// If IP is listed in whitelist, return unmodified $content
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if ($this->isWhitelisted($this->ipaddr)) {
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return $content;
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}
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// If IP is listed in blacklist, deny access
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if ($this->isBlacklisted($this->ipaddr)) {
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header('HTTP/1.1 403 Forbidden');
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die();
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}
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if ($this->isBanned($this->ipaddr)) {
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if ($this->ban_httpstatus) { $this->sendForbiddenHeader(); }
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$this->debug("IP already banned");
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}
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$this->debug("Sending login form.");
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return $content;
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}
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private function isBanned($ip) {
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$row = $this->getPreviousBanData($ip);
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if ($row) {
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$data = unserialize($row['data']);
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$duration = $data['duration'];
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$timeleft = (($duration + $row['epoch']) - time());
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if ($timeleft > 0) { return $timeleft; }
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}
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return false;
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}
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/**
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* Hooked function: login_failed(array)
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* http://trac.roundcube.net/wiki/Plugin_Hooks#login_failed
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*
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* Log event to database
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*
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* @param array
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* [code, host, user, abort]
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*
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*/
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public function hookLoginFailed($args) {
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$this->debug("hookLoginFailed");
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// Log failed login attempt
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$data = array('user' => $args['user']);
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$query = sprintf("INSERT INTO %s (epoch, type, ipaddr, data) VALUES (%d, %d, '%s', '%s')", $this->db_table, time(), 0, $this->ipaddr, serialize($data));
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$result = $this->rc->db->query($query);
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if (!$result) { $this->dbError($query); return; }
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$this->debug($query . " [" . $result->rowCount() . "]");
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// Check if banned now that above record has been updated
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$rTime = (time() - $this->fail_reset); // How far to look back for failed logins
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// Check if last ban lifted was within rTime
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$row = $this->getPreviousBanData($this->ipaddr);
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if ($row) {
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$data = unserialize($row['data']);
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$banLifted = $row['epoch'] + $data['duration'];
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if ($rTime < $banLifted) {
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// If IP was unbanned recently, only check since it was unbanned
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$rTime = $banLifted;
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}
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}
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$query = sprintf("SELECT count(*) AS n FROM %s WHERE ipaddr = '%s' AND epoch >= %d", $this->db_table, $this->ipaddr, $rTime);
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$result = $this->rc->db->query($query);
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if (!$result) { $this->dbError($query); return false; }
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$this->debug($query . " [" . $result->rowCount() . "]");
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$row = $result->fetch();
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if (!$row) { $this->debug("Warning, SQL result empty: $query"); return false; } // No rows? Strange, abort.
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$this->debug("Found " . $row['n'] . " failed attempts in last " . (time() - $rTime) . "s");
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if (($row['n'] >= $this->fail_max)) {
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$this->debug("IP banned.");
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// This IP is now banned
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$repeat = 0;
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$row = $this->getPreviousBanData($this->ipaddr);
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if ($row) {
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// IP has been banned before, check if its a recent repeat offender
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$data = unserialize($row['data']);
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$this->debug("Previous ban data: " . $row['data']);
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// Classed as a repeat offender if IP is banned again after the previous ban duration
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// multiplied by <repeat_multiplier>
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$bTime = (($data['duration'] * $this->repeat_multiplier) + $row['epoch']); // Multiply previous bantime by multiplier
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if (time() <= ($bTime > $this->repeat_reset ? $bTime : $this->repeat_reset)) {
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// Repeat offender, increase repeat
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$repeat = $data['repeat'] +1;
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$this->debug("Repeat offender. Repeat set to " . $repeat);
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}
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}
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$duration = ($this->ban_period * ($repeat > 0 ? pow($this->repeat_multiplier,$repeat) : 1));
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$data = array(
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'duration' => $duration, // Ban duration based on history
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'repeat' => $repeat
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);
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$query = sprintf("INSERT INTO %s (epoch, type, ipaddr, data) VALUES (%d, %d, '%s', '%s')", $this->db_table, time(), 1, $this->ipaddr, serialize($data));
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$result = $this->rc->db->query($query, time(), 1, $this->ipaddr, serialize($data));
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if (!$result) { $this->dbError($query); return; }
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$this->debug($query . " [" . $result->rowCount() . "]");
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return $args;
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}
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}
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/**
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* Hooked function: authenticate(array)
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* http://trac.roundcube.net/wiki/Plugin_Hooks#authenticate
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*
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* Login attempt intercepted if IP is banned.
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*
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* @param array
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* [host, user, cookiecheck, valid]
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* @return array
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*/
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public function hookAuthenticate($args) {
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// Check whitelist/blacklist again, in case login form was bypassed somehow
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// If IP is listed in whitelist, return unmodified $args
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if ($this->isWhitelisted($this->ipaddr)) {
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return $args;
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}
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// If IP is listed in blacklist, deny access
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if ($this->isBlacklisted($this->ipaddr)) {
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$this->sendForbiddenHeader();
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}
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$isBanned = $this->isBanned($this->ipaddr);
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if ($isBanned) {
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if ($this->ban_httpstatus) { $this->sendForbiddenHeader(); }
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$this->rc->output->show_message(sprintf($this->gettext('ipbanned'), $this->secs2hr($isBanned)), 'error');
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$this->rc->output->set_env('task', 'login');
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$this->rc->output->send('login');
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die();
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}
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$this->debug("Login form submitted, username: " . $args['user']);
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return $args;
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}
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}
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?>
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