<?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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@copyrighth 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',
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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/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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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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if ( $this->get_amavis_config() == '' || !is_writeable($this->get_amavis_config()) ) {
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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($mail_config['dkim_path']) && (!empty($mail_config['dkim_path'])) && isset($data['new']['dkim_private']) && !empty($data['new']['dkim_private'])) {
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if (!is_dir($mail_config['dkim_path'])) {
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$app->log('DKIM Path '.$mail_config['dkim_path'].' not found - (re)created.', LOGLEVEL_DEBUG);
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mkdir($mail_config['dkim_path'], 0750, true);
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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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} else {
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$app->log('Unable to write DKIM settings; Check your config!', LOGLEVEL_ERROR);
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$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, $conf;
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$pos_init=array(
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$conf['init_scripts'].'/amavis',
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$conf['init_scripts'].'/amavisd'
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);
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$initfile='';
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foreach($pos_init as $init) {
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if (is_executable($init)) {
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$initfile=$init;
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break;
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}
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}
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$app->log('Restarting amavis: '.$initfile.'.', LOGLEVEL_DEBUG);
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exec(escapeshellarg($initfile).' restart', $output);
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foreach($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 $key_domain mail-domain
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* @return bool - true when the key is written to disk
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*/
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function write_dkim_key($key_file, $key_value, $key_domain) {
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global $app, $mailconfig;
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$success=false;
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if (!file_put_contents($key_file.'.private', $key_value) === false) {
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$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', $pubkey, $result);
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$public_key='';
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foreach($pubkey as $values) $public_key=$public_key.$values."\n";
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/* save the DKIM Public-key in dkim-dir */
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if (!file_put_contents($key_file.'.public', $public_key) === false)
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$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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}
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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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exec('rm -f '.escapeshellarg($key_file.'.private'));
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$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($key_file.'.public')) {
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exec('rm -f '.escapeshellarg($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) {
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global $app, $mail_config;
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$amavis_config = file_get_contents($this->get_amavis_config());
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$key_value="dkim_key('".$key_domain."', 'default', '".$mail_config['dkim_path']."/".$key_domain.".private');\n";
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if(strpos($amavis_config, $key_value) === false) {
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$amavis_config = str_replace($key_value, '', $amavis_config);
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if (!file_put_contents($this->get_amavis_config(), $key_value, FILE_APPEND) === false) {
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$app->log('Adding DKIM Private-key to amavis-config.', LOGLEVEL_DEBUG);
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$this->restart_amavis();
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}
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} else {
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$app->log('DKIM Private-key already in amavis-config.',LOGLEVEL_DEBUG);
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}
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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 $app;
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$amavis_config = file($this->get_amavis_config());
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$i=0;$found=false;
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foreach($amavis_config as $line) {
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if (preg_match("/^\bdkim_key\b.*\b".$key_domain."\b/", $line)) {
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unset($amavis_config[$i]);
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$found=true;
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}
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$i++;
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}
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if ($found) {
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file_put_contents($this->get_amavis_config(), $amavis_config);
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$app->log('Deleted the DKIM settings from amavis-config for '.$key_domain.'.', LOGLEVEL_DEBUG);
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$this->restart_amavis();
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} else $app->log('Unable to delete the DKIM settings from amavis-config for '.$key_domain.'.', LOGLEVEL_DEBUG);
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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'], $data['new']['domain'])) {
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$this->add_to_amavis($data['new']['domain']);
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} else {
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$app->log('Error saving the DKIM Private-key for '.$data['new']['domain'].' - DKIM is not enabled for the domain.', LOGLEVEL_ERROR);
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}
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}
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else {
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$app->log('DKIM for '.$data['new']['domain'].' not written to disk - domain is inactive', LOGLEVEL_DEBUG);
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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'], $_data['domain']);
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$this->remove_from_amavis($_data['domain']);
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}
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/**
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* Function called by onLoad
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* deletes dkim-keys
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*/
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function domain_dkim_delete($event_name, $data) {
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if (isset($data['old']['dkim']) && $data['old']['dkim'] == 'y' && $data['old']['active'] == 'y') $this->remove_dkim($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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/**
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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 $app;
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if ($this->check_system($data)) {
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/* maildomain disabled */
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if ($data['new']['active'] == 'n' && $data['old']['active'] == 'y') {
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$app->log('Maildomain '.$data['new']['domain'].' disabled - remove DKIM-settings', LOGLEVEL_DEBUG);
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if ($data['new']['dkim']=='y') {
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$this->remove_dkim($data['new']);
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}
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if ($data['old']['dkim']=='y') {
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$this->remove_dkim($data['old']);
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}
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}
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/* maildomain re-enabled */
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if ($data['new']['active'] == 'y' && $data['old']['active'] == 'n') {
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if ($data['new']['dkim']=='y') {
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$this->add_dkim($data);
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}
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}
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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($data);
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}
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/* new private-key or new domain-name */
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if ($data['new']['dkim_private'] != $data['old']['dkim_private'] || $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'] == $data['old']) {
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$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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