<?php
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/**
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Copyright (c) 2007 - 2013, Till Brehm, projektfarm Gmbh
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Copyright (c) 2013, Florian Schaal, info@schaal-24.de
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All rights reserved.
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Redistribution and use in source and binary forms, with or without modification,
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are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions and the following disclaimer in the documentation
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and/or other materials provided with the distribution.
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* Neither the name of ISPConfig nor the names of its contributors
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may be used to endorse or promote products derived from this software without
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specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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@author Florian Schaal, info@schaal-24.de
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@copyright Florian Schaal, info@schaal-24.de
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*/
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class mail_plugin_dkim {
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var $plugin_name = 'mail_plugin_dkim';
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var $class_name = 'mail_plugin_dkim';
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// private variables
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var $action = '';
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/**
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* This function is called during ispconfig installation to determine
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* if a symlink shall be created for this plugin.
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*/
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function onInstall() {
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global $conf;
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if($conf['services']['mail'] == true) {
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return true;
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} else {
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return false;
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}
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}
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/**
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* This function is called when the plugin is loaded
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*/
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function onLoad() {
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global $app, $conf;
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/*
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Register for the events
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*/
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$app->plugins->registerEvent('mail_domain_delete', $this->plugin_name, 'domain_dkim_delete');
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$app->plugins->registerEvent('mail_domain_insert', $this->plugin_name, 'domain_dkim_insert');
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$app->plugins->registerEvent('mail_domain_update', $this->plugin_name, 'domain_dkim_update');
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}
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/**
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* This function gets the amavisd-config file
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* @return string path to the amavisd-config for dkim-keys
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*/
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function get_amavis_config() {
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$pos_config=array(
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'/etc/amavisd.conf/50-user',
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'/etc/amavis/conf.d/50-user',
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'/etc/amavisd.conf',
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'/etc/amavisd/amavisd.conf'
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);
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$amavis_configfile='';
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foreach($pos_config as $conf) {
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if (is_file($conf)) {
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$amavis_configfile=$conf;
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break;
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}
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}
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//* If we can use seperate config-files with amavis use 60-dkim
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if (substr_compare($amavis_configfile, '50-user', -7) === 0)
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$amavis_configfile = str_replace('50-user', '60-dkim', $amavis_configfile);
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return $amavis_configfile;
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}
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/**
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* This function checks the relevant configs and disables dkim for the domain
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* if the directory for dkim is not writeable or does not exist
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* @param array $data mail-settings
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* @return boolean - true when the amavis-config and the dkim-dir are writeable
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*/
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function check_system($data) {
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global $app, $mail_config;
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$app->uses('getconf');
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$check=true;
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/* check for amavis-config */
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$amavis_configfile = $this->get_amavis_config();
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//* When we can use 60-dkim for the dkim-keys create the file if it does not exists.
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if (substr_compare($amavis_configfile, '60-dkim', -7) === 0 && !file_exists($amavis_configfile))
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$app->system->touch($amavis_configfile);
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if ( $amavis_configfile == '' || !is_writeable($amavis_configfile) ) {
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$app->log('Amavis-config not found or not writeable.', LOGLEVEL_ERROR);
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$check=false;
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}
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/* dir for dkim-keys writeable? */
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$mail_config = $app->getconf->get_server_config($conf['server_id'], 'mail');
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if ( isset($mail_config['dkim_path']) &&
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!empty($mail_config['dkim_path']) &&
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// isset($data['new']['dkim_private']) &&
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// !empty($data['new']['dkim_private']) &&
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$mail_config['dkim_path'] != '/'
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) {
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if (!is_dir($mail_config['dkim_path'])) {
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$app->log('DKIM Path '.$mail_config['dkim_path'].' not found - (re)created.', LOGLEVEL_DEBUG);
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if($app->system->is_user('amavis')) {
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$amavis_user='amavis';
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} elseif ($app->system->is_user('vscan')) {
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$amavis_user='vscan';
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}
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else {
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$amavis_user='';
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}
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if(!empty($amavis_user)) {
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mkdir($mail_config['dkim_path'], 0750, true);
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$app->system->chown($mail_config['dkim_path'], $amavis_user);
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} else {
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mkdir($mail_config['dkim_path'], 0755, true);
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$app->log('No user amavis or vscan found - using root for '.$mail_config['dkim_path'], LOGLEVEL_WARNING);
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}
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} else {
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if (!$app->system->checkpath($mail_config['dkim_path'])) {
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$app->log('Unable to write DKIM settings - invalid DKIM-Path (symlink?)', LOGLEVEL_ERROR);
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$check=false;
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}
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}
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if (!is_writeable($mail_config['dkim_path'])) {
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$app->log('DKIM Path '.$mail_config['dkim_path'].' not writeable.', LOGLEVEL_ERROR);
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$check=false;
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}
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if ( !$app->system->checkpath($mail_config['dkim_path']) ) {
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$app->log('DKIM Path '.$mail_config['dkim_path'].' failed in checkpath.', LOGLEVEL_ERROR);
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$check = false;
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}
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} else {
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$app->log('Unable to write DKIM settings - no or invalid DKIM-Path defined', LOGLEVEL_ERROR);
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$check=false;
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}
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return $check;
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}
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/**
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* This function restarts amavis
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*/
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function restart_amavis() {
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global $app;
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$initcommand = $app->system->getinitcommand(array('amavis', 'amavisd'), 'restart');
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$app->log('Restarting amavis: '.$initcommand.'.', LOGLEVEL_DEBUG);
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exec($initcommand, $output);
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foreach($output as $logline) $app->log($logline, LOGLEVEL_DEBUG);
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}
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/**
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* This function writes the keyfiles (public and private)
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* @param string $key_file full path to the key-file
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* @param string $key_value private-key
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* @param string $key_domain mail-domain
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* @return bool - true when the private key was written to disk
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*/
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function write_dkim_key($key_file, $key_value, $key_domain) {
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global $app, $mailconfig;
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$success=false;
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if ($key_file == '' || $key_value == '' || $key_domain == '') {
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$app->log('DKIM internal error for domain '.$key_domain, LOGLEVEL_ERROR);
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return $success;
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}
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if ( $app->system->file_put_contents($key_file.'.private', $key_value) ) {
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$app->log('Saved DKIM Private-key to '.$key_file.'.private', LOGLEVEL_DEBUG);
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$success=true;
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/* now we get the DKIM Public-key */
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exec('cat '.escapeshellarg($key_file.'.private').'|openssl rsa -pubout 2> /dev/null', $pubkey, $result);
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$public_key='';
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foreach($pubkey as $values) $public_key=$public_key.$values."\n";
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/* save the DKIM Public-key in dkim-dir */
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if ( $app->system->file_put_contents($key_file.'.public', $public_key) )
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$app->log('Saved DKIM Public to '.$key_domain.'.', LOGLEVEL_DEBUG);
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else $app->log('Unable to save DKIM Public to '.$key_domain.'.', LOGLEVEL_DEBUG);
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} else {
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$app->log('Unable to save DKIM Private-key to '.$key_file.'.private', LOGLEVEL_ERROR);
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}
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return $success;
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}
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/**
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* This function removes the keyfiles
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* @param string $key_file full path to the key-file
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* @param string $key_domain mail-domain
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*/
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function remove_dkim_key($key_file, $key_domain) {
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global $app;
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if (file_exists($key_file.'.private')) {
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$app->system->unlink($key_file.'.private');
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$app->log('Deleted the DKIM Private-key for '.$key_domain.'.', LOGLEVEL_DEBUG);
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} else $app->log('Unable to delete the DKIM Private-key for '.$key_domain.' (not found).', LOGLEVEL_DEBUG);
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if (file_exists($key_file.'.public')) {
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$app->system->unlink($key_file.'.public');
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$app->log('Deleted the DKIM Public-key for '.$key_domain.'.', LOGLEVEL_DEBUG);
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} else $app->log('Unable to delete the DKIM Public-key for '.$key_domain.' (not found).', LOGLEVEL_DEBUG);
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}
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/**
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* This function adds the entry to the amavisd-config
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* @param string $key_domain mail-domain
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*/
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function add_to_amavis($key_domain, $selector, $old_selector) {
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global $app, $mail_config;
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if (empty($selector)) $selector = 'default';
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$restart = false;
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$amavis_configfile = $this->get_amavis_config();
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$search_regex = "/(\n|\r)?dkim_key\(\'".$key_domain."\',\ \'(".$selector."|".$old_selector."){1}?\'.*/";
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//* If we are using seperate config-files with amavis remove existing keys from 50-user to avoid duplicate keys
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if (substr_compare($amavis_configfile, '60-dkim', -7) === 0) {
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$temp_configfile = str_replace('60-dkim', '50-user', $amavis_configfile);
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$temp_config = $app->system->file_get_contents($temp_configfile, true);
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if (preg_match($search_regex, $temp_config)) {
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$temp_config = preg_replace($search_regex, '', $temp_config)."\n";
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$app->system->file_put_contents($temp_configfile, $temp_config, true);
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}
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unset($temp_configfile);
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unset($temp_config);
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}
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$key_value="dkim_key('".$key_domain."', '".$selector."', '".$mail_config['dkim_path']."/".$key_domain.".private');\n";
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$amavis_config = $app->system->file_get_contents($amavis_configfile, true);
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$amavis_config = preg_replace($search_regex, '', $amavis_config).$key_value;
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if ( $app->system->file_put_contents($amavis_configfile, $amavis_config, true) ) {
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$app->log('Adding DKIM Private-key to amavis-config.', LOGLEVEL_DEBUG);
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$restart = true;
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} else {
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$app->log('Unable to add DKIM Private-key for '.$key_domain.' to amavis-config.', LOGLEVEL_ERROR);
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}
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return $restart;
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}
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/**
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* This function removes the entry from the amavisd-config
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* @param string $key_domain mail-domain
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*/
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function remove_from_amavis($key_domain) {
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global $app;
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$restart = false;
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$amavis_configfile = $this->get_amavis_config();
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$amavis_config = $app->system->file_get_contents($amavis_configfile, true);
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$search_regex = "/(\n|\r)?dkim_key.*".$key_domain.".*(\n|\r)?/";
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if (preg_match($search_regex, $amavis_config)) {
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$amavis_config = preg_replace($search_regex, '', $amavis_config);
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$app->system->file_put_contents($amavis_configfile, $amavis_config, true);
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$app->log('Deleted the DKIM settings from amavis-config for '.$key_domain.'.', LOGLEVEL_DEBUG);
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$restart = true;
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}
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//* If we are using seperate config-files with amavis remove existing keys from 50-user, too
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if (substr_compare($amavis_configfile, '60-dkim', -7) === 0) {
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$temp_configfile = str_replace('60-dkim', '50-user', $amavis_configfile);
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$temp_config = $app->system->file_get_contents($temp_configfile, true);
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if (preg_match($search_regex, $temp_config)) {
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$temp_config = preg_replace($search_regex, '', $temp_config);
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$app->system->file_put_contents($temp_configfile, $temp_config, true);
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$restart = true;
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}
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unset($temp_configfile);
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unset($temp_config);
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}
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return $restart;
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}
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/**
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* This function controlls new key-files and amavisd-entries
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* @param array $data mail-settings
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*/
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function add_dkim($data) {
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global $app;
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if ($data['new']['active'] == 'y') {
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$mail_config = $app->getconf->get_server_config($conf['server_id'], 'mail');
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if ( substr($mail_config['dkim_path'], strlen($mail_config['dkim_path'])-1) == '/' )
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$mail_config['dkim_path'] = substr($mail_config['dkim_path'], 0, strlen($mail_config['dkim_path'])-1);
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if ($this->write_dkim_key($mail_config['dkim_path']."/".$data['new']['domain'], $data['new']['dkim_private'], $data['new']['domain'])) {
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if ($this->add_to_amavis($data['new']['domain'], $data['new']['dkim_selector'], $data['old']['dkim_selector'] )) {
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$this->restart_amavis();
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} else {
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$this->remove_dkim_key($mail_config['dkim_path']."/".$data['new']['domain'], $data['new']['domain']);
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}
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} else {
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$app->log('Error saving the DKIM Private-key for '.$data['new']['domain'].' - DKIM is not enabled for the domain.', LOGLEVEL_DEBUG);
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}
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}
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}
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/**
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* This function controlls the removement of keyfiles (public and private)
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* and the entry in the amavisd-config
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* @param array $data mail-settings
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*/
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function remove_dkim($_data) {
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global $app;
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$mail_config = $app->getconf->get_server_config($conf['server_id'], 'mail');
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if ( substr($mail_config['dkim_path'], strlen($mail_config['dkim_path'])-1) == '/' )
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$mail_config['dkim_path'] = substr($mail_config['dkim_path'], 0, strlen($mail_config['dkim_path'])-1);
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$this->remove_dkim_key($mail_config['dkim_path']."/".$_data['domain'], $_data['domain']);
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if ($this->remove_from_amavis($_data['domain']))
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$this->restart_amavis();
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}
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/**
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* Function called by onLoad
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* deletes dkim-keys
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*/
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function domain_dkim_delete($event_name, $data) {
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if (isset($data['old']['dkim']) && $data['old']['dkim'] == 'y' && $data['old']['active'] == 'y')
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$this->remove_dkim($data['old']);
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}
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/**
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* Function called by onLoad
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* insert dkim-keys
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*/
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function domain_dkim_insert($event_name, $data) {
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if (isset($data['new']['dkim']) && $data['new']['dkim']=='y' && $this->check_system($data))
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$this->add_dkim($data);
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}
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/**
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* Function called by onLoad
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* chang dkim-settings
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*/
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function domain_dkim_update($event_name, $data) {
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global $app;
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if($data['new']['dkim'] == 'y' || $data['old']['dkim'] == 'y'){
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if ($this->check_system($data)) {
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/* maildomain disabled */
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if ($data['new']['active'] == 'n' && $data['old']['active'] == 'y' && $data['new']['dkim']=='y') {
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$app->log('Maildomain '.$data['new']['domain'].' disabled - remove DKIM-settings', LOGLEVEL_DEBUG);
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$this->remove_dkim($data['new']);
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}
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/* maildomain re-enabled */
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if ($data['new']['active'] == 'y' && $data['old']['active'] == 'n' && $data['new']['dkim']=='y')
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$this->add_dkim($data);
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/* maildomain active - only dkim changes */
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if ($data['new']['active'] == 'y' && $data['old']['active'] == 'y') {
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/* dkim disabled */
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if ($data['new']['dkim'] != $data['old']['dkim'] && $data['new']['dkim'] == 'n') {
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$this->remove_dkim($data['new']);
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}
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/* dkim enabled */
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elseif ($data['new']['dkim'] != $data['old']['dkim'] && $data['new']['dkim'] == 'y') {
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$this->add_dkim($data);
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}
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/* new private-key */
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if ($data['new']['dkim_private'] != $data['old']['dkim_private'] && $data['new']['dkim'] == 'y') {
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$this->add_dkim($data);
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}
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/* new selector */
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if ($data['new']['dkim_selector'] != $data['old']['dkim_selector'] && $data['new']['dkim'] == 'y') {
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$this->add_dkim($data);
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}
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/* new domain-name */
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if ($data['new']['domain'] != $data['old']['domain']) {
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$this->remove_dkim($data['old']);
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$this->add_dkim($data);
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}
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}
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/* resync */
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if ($data['new']['active'] == 'y' && $data['new'] == $data['old'] && $data['new']['dkim']=='y') {
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$this->add_dkim($data);
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}
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}
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}
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}
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}
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?>
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