<?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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*/
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/**
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* This script is invoked by interface/js/mail_domain_dkim.js
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* to generate or show the DKIM Private-key and to show the Private-key.
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* returns DKIM keys, selector, and dns-record
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*/
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require_once '../../lib/config.inc.php';
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require_once '../../lib/app.inc.php';
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require_once '../../lib/classes/validate_dkim.inc.php';
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//* Check permissions for module
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$app->auth->check_module_permissions('mail');
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header('Content-Type: text/xml; charset=utf-8');
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header('Cache-Control: must-revalidate, pre-check=0, no-store, no-cache, max-age=0, post-check=0');
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function validate_domain($domain) {
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$regex = '/^[\w\.\-]{2,255}\.[a-zA-Z0-9\-]{2,30}$/';
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if ( preg_match($regex, $domain) === 1 ) return true; else return false;
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}
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function validate_selector($selector) {
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$regex = '/^[a-z0-9]{0,63}$/';
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if ( preg_match($regex, $selector) === 1 ) return true; else return false;
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}
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/**
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* This function formats the public-key
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* @param array $pubkey
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* @return string public-key
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*/
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function pub_key($pubkey) {
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$public_key='';
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foreach($pubkey as $values) $public_key=$public_key.$values."\n";
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return $public_key;
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}
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function get_public_key($private_key, $dkim_strength) {
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$validate_dkim=new validate_dkim ();
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if($validate_dkim->validate_post('private', $private_key, $dkim_strength)) { /* validate the $_POST-value */
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exec('echo '.escapeshellarg($private_key).'|openssl rsa -pubout -outform PEM 2> /dev/null',$pubkey,$result);
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$public_key=pub_key($pubkey);
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} else {
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$public_key='invalid key';
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}
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return $public_key;
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}
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/**
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* This function updates the selector if a new key-pair was created
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* and the selector is already used in the dns-record
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* @param string $old_selector
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* @return string selector
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*/
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function new_selector ($old_selector, $domain, $client_id = -1) {
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global $app;
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//* validate post-values
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if ( validate_domain($domain) && validate_selector($old_selector) ) {
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//* get active selectors from dns
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$soa_rec = $app->db->queryOneRecord("SELECT * FROM dns_soa WHERE active = 'Y' AND origin = ?", $domain.'.');
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if ( isset($soa_rec) && !empty($soa_rec) ) {
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//* check for a dkim-record in the dns?
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$dns_data = $app->db->queryOneRecord("SELECT name FROM dns_rr WHERE name = ? AND active = 'Y'", $old_selector.'._domainkey.'.$domain.'.');
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if ( !empty($dns_data) ){
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$selector = str_replace( '._domainkey.'.$domain.'.', '', $dns_data['name']);
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} else {
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}
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} else { //* no dns-zone found - check for existing mail-domain to create a new selector (we need this if a external dns is used)
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if ( $client_id >= 0 ) {
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$sql = "SELECT * from mail_domain WHERE dkim = 'y' AND domain = ? AND dkim_selector = ?";
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$maildomain = $app->db->queryOneRecord($sql, $domain, $old_selector);
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if ( !empty($maildomain) ) {
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$selector = $maildomain['selector'];
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}
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}
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}
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if ( $old_selector == $selector) {
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$selector = substr($old_selector, 0, 53) . time(); //* add unix-timestamp to delimiter to allow old and new key in the dns
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} else {
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$selector = $old_selector;
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}
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} else {
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$selector = 'invalid domain or selector';
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}
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return $selector;
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}
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$client_id = $app->functions->intval($_POST['client_id']);
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//* get dkim-strength for server_id
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$sql = "SELECT server_id from mail_domain WHERE domain = ?";
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$mail_server = $app->db->queryOneRecord($sql, $_POST['domain']);
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if ( is_array($mail_server) ) { //* we are adding an existing mail-domain
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$mail_server_id = $app->functions->intval( $mail_server['server_id'] );
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} else {
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$sql = "SELECT default_mailserver FROM client WHERE client_id = ?";
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$mail_server = $app->db->queryOneRecord($sql, $client_id);
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$mail_server_id = $app->functions->intval( $mail_server['default_mailserver'] );
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}
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unset($mail_server);
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$mail_config = $app->getconf->get_server_config($mail_server_id, 'mail');
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$dkim_strength = $app->functions->intval($mail_config['dkim_strength']);
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unset($mail_config);
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if ( empty($dkim_strength) ) $dkim_strength = 2048;
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$rnd_val = $dkim_strength * 10;
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exec('openssl rand -out ../../temp/random-data.bin '.$rnd_val.' 2> /dev/null', $output, $result);
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exec('openssl genrsa -rand ../../temp/random-data.bin '.$dkim_strength.' 2> /dev/null', $privkey, $result);
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unlink("../../temp/random-data.bin");
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foreach($privkey as $values) $private_key=$private_key.$values."\n";
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//* check the selector for updated dkim-settings only
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if ( isset($_POST['dkim_public']) && !empty($_POST['dkim_public']) ) $selector = new_selector($_POST['dkim_selector'], $_POST['domain'], $client_id);
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if ( !isset($public_key) ) $public_key=get_public_key($private_key, $dkim_strength);
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$dns_record=str_replace(array('-----BEGIN PUBLIC KEY-----','-----END PUBLIC KEY-----',"\r","\n"),'',$public_key);
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if ( !isset($selector) ) {
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if ( validate_selector($_POST['dkim_selector']) ) $selector=$_POST['dkim_selector'];
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}
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echo "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n";
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echo "<formatname>\n";
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echo "<selector>".$selector."</selector>\n";
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echo "<privatekey>".$private_key."</privatekey>\n";
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echo "<publickey>".$public_key."</publickey>\n";
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if ( validate_domain($_POST['domain']) ) {
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echo '<dns_record>'.$selector.'._domainkey.'.$_POST['domain'].'. 3600 TXT "v=DKIM1; t=s; p='.$dns_record.'"</dns_record>';
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}
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echo "</formatname>\n";
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?>
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