702 lines
21 KiB
PHP
702 lines
21 KiB
PHP
<?php
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/**
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* ownCloud – LDAP lib
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*
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* @author Arthur Schiwon
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* @copyright 2012 Arthur Schiwon blizzz@owncloud.com
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
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* License as published by the Free Software Foundation; either
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* version 3 of the License, or any later version.
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*
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* This library 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 AFFERO GENERAL PUBLIC LICENSE for more details.
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*
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* You should have received a copy of the GNU Affero General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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define('LDAP_GROUP_MEMBER_ASSOC_ATTR','uniqueMember');
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define('LDAP_GROUP_DISPLAY_NAME_ATTR','cn');
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//needed to unbind, because we use OC_LDAP only statically
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class OC_LDAP_DESTRUCTOR {
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public function __destruct() {
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OC_LDAP::destruct();
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}
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}
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class OC_LDAP {
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static protected $ldapConnectionRes = false;
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static protected $configured = false;
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//cached settings
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static protected $ldapHost;
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static protected $ldapPort;
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static protected $ldapBase;
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static protected $ldapBaseUsers;
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static protected $ldapBaseGroups;
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static protected $ldapAgentName;
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static protected $ldapAgentPassword;
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static protected $ldapTLS;
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static protected $ldapNoCase;
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static protected $ldapIgnoreNamingRules;
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// user and group settings, that are needed in both backends
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static protected $ldapUserDisplayName;
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static protected $ldapUserFilter;
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static protected $ldapGroupDisplayName;
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static protected $ldapLoginFilter;
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static protected $__d;
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/**
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* @brief initializes the LDAP backend
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* @param $force read the config settings no matter what
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*
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* initializes the LDAP backend
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*/
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static public function init($force = false) {
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if(is_null(self::$__d)) {
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self::$__d = new OC_LDAP_DESTRUCTOR();
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}
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self::readConfiguration($force);
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self::establishConnection();
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}
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static public function destruct() {
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@ldap_unbind(self::$ldapConnectionRes);
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}
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/**
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* @brief returns a read-only configuration value
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* @param $key the name of the configuration value
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* @returns the value on success, otherwise null
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*
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* returns a read-only configuration values
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*
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* we cannot work with getters, because it is a static class
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*/
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static public function conf($key) {
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if(!self::$configured) {
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self::init();
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}
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$availableProperties = array(
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'ldapUserDisplayName',
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'ldapGroupDisplayName',
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'ldapLoginFilter'
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);
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if(in_array($key, $availableProperties)) {
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return self::$$key;
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}
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return null;
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}
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/**
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* gives back the database table for the query
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*/
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static private function getMapTable($isUser) {
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if($isUser) {
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return '*PREFIX*ldap_user_mapping';
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} else {
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return '*PREFIX*ldap_group_mapping';
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}
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}
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/**
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* @brief returns the LDAP DN for the given internal ownCloud name of the group
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* @param $name the ownCloud name in question
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* @returns string with the LDAP DN on success, otherwise false
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*
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* returns the LDAP DN for the given internal ownCloud name of the group
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*/
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static public function groupname2dn($name) {
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return self::ocname2dn($name, false);
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}
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/**
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* @brief returns the LDAP DN for the given internal ownCloud name of the user
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* @param $name the ownCloud name in question
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* @returns string with the LDAP DN on success, otherwise false
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*
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* returns the LDAP DN for the given internal ownCloud name of the user
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*/
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static public function username2dn($name) {
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$dn = self::ocname2dn($name, true);
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if($dn) {
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return $dn;
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} else {
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//fallback: user is not mapped
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self::init();
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$filter = self::combineFilterWithAnd(array(
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self::$ldapUserFilter,
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self::$ldapUserDisplayName . '=' . $name,
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));
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$result = self::searchUsers($filter, 'dn');
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if(isset($result[0]['dn'])) {
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self::mapUser($result[0], $name);
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return $result[0];
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}
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}
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return false;
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}
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static private function ocname2dn($name, $isUser) {
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$table = self::getMapTable($isUser);
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$query = OCP\DB::prepare('
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SELECT ldap_dn
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FROM '.$table.'
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WHERE owncloud_name = ?
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');
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$record = $query->execute(array($name))->fetchOne();
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return $record;
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}
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/**
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* @brief returns the internal ownCloud name for the given LDAP DN of the group
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* @param $dn the dn of the group object
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* @param $ldapname optional, the display name of the object
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* @returns string with with the name to use in ownCloud, false on DN outside of search DN
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*
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* returns the internal ownCloud name for the given LDAP DN of the group
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*/
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static public function dn2groupname($dn, $ldapname = null) {
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if(strrpos($dn, self::ldapBaseGroups) !== (strlen($dn)-strlen(self::ldapBaseGroups)-1)) {
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return false;
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}
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return self::dn2ocname($dn, $ldapname, false);
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}
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/**
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* @brief returns the internal ownCloud name for the given LDAP DN of the user
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* @param $dn the dn of the user object
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* @param $ldapname optional, the display name of the object
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* @returns string with with the name to use in ownCloud
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*
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* returns the internal ownCloud name for the given LDAP DN of the user, false on DN outside of search DN
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*/
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static public function dn2username($dn, $ldapname = null) {
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if(strrpos($dn, self::ldapBaseUsers) !== (strlen($dn)-strlen(self::ldapBaseUsers)-1)) {
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return false;
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}
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return self::dn2ocname($dn, $ldapname, true);
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}
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static public function dn2ocname($dn, $ldapname = null, $isUser = true) {
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$dn = self::sanitizeDN($dn);
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$table = self::getMapTable($isUser);
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if($isUser) {
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$nameAttribute = self::conf('ldapUserDisplayName');
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} else {
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$nameAttribute = self::conf('ldapGroupDisplayName');
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}
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$query = OCP\DB::prepare('
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SELECT owncloud_name
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FROM '.$table.'
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WHERE ldap_dn = ?
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');
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$component = $query->execute(array($dn))->fetchOne();
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if($component) {
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return $component;
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}
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if(is_null($ldapname)) {
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$ldapname = self::readAttribute($dn, $nameAttribute);
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$ldapname = $ldapname[0];
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}
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$ldapname = self::sanitizeUsername($ldapname);
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//a new user/group! Then let's try to add it. We're shooting into the blue with the user/group name, assuming that in most cases there will not be a conflict. Otherwise an error will occur and we will continue with our second shot.
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if(self::mapComponent($dn, $ldapname, $isUser)) {
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return $ldapname;
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}
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//doh! There is a conflict. We need to distinguish between users/groups. Adding indexes is an idea, but not much of a help for the user. The DN is ugly, but for now the only reasonable way. But we transform it to a readable format and remove the first part to only give the path where this object is located.
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$oc_name = self::alternateOwnCloudName($ldapname, $dn);
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if(self::mapComponent($dn, $oc_name, $isUser)) {
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return $oc_name;
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}
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//and this of course should never been thrown :)
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throw new Exception('LDAP backend: unexpected collision of DN and ownCloud Name.');
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}
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/**
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* @brief gives back the user names as they are used ownClod internally
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* @param $ldapGroups an array with the ldap Users result in style of array ( array ('dn' => foo, 'uid' => bar), ... )
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* @returns an array with the user names to use in ownCloud
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*
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* gives back the user names as they are used ownClod internally
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*/
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static public function ownCloudUserNames($ldapUsers) {
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return self::ldap2ownCloudNames($ldapUsers, true);
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}
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/**
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* @brief gives back the group names as they are used ownClod internally
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* @param $ldapGroups an array with the ldap Groups result in style of array ( array ('dn' => foo, 'cn' => bar), ... )
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* @returns an array with the group names to use in ownCloud
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*
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* gives back the group names as they are used ownClod internally
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*/
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static public function ownCloudGroupNames($ldapGroups) {
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return self::ldap2ownCloudNames($ldapGroups, false);
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}
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static private function ldap2ownCloudNames($ldapObjects, $isUsers) {
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if($isUsers) {
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$knownObjects = self::mappedUsers();
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$nameAttribute = self::conf('ldapUserDisplayName');
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} else {
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$knownObjects = self::mappedGroups();
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$nameAttribute = self::conf('ldapGroupDisplayName');
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}
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$ownCloudNames = array();
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foreach($ldapObjects as $ldapObject) {
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$key = self::recursiveArraySearch($knownObjects, $ldapObject['dn']);
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//everything is fine when we know the group
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if($key !== false) {
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$ownCloudNames[] = $knownObjects[$key]['owncloud_name'];
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continue;
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}
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//a new group! Then let's try to add it. We're shooting into the blue with the group name, assuming that in most cases there will not be a conflict. But first make sure, that the display name contains only allowed characters.
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$ocname = self::sanitizeUsername($ldapObject[$nameAttribute]);
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if(self::mapComponent($ldapObject['dn'], $ocname, $isUsers)) {
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$ownCloudNames[] = $ocname;
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continue;
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}
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//doh! There is a conflict. We need to distinguish between groups. Adding indexes is an idea, but not much of a help for the user. The DN is ugly, but for now the only reasonable way. But we transform it to a readable format and remove the first part to only give the path where this entry is located.
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$ocname = self::alternateOwnCloudName($ocname, $ldapObject['dn']);
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if(self::mapComponent($ldapObject['dn'], $ocname, $isUsers)) {
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$ownCloudNames[] = $ocname;
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continue;
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}
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//and this of course should never been thrown :)
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throw new Exception('LDAP backend: unexpected collision of DN and ownCloud Name.');
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}
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return $ownCloudNames;
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}
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/**
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* @brief creates a hopefully unique name for owncloud based on the display name and the dn of the LDAP object
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* @param $name the display name of the object
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* @param $dn the dn of the object
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* @returns string with with the name to use in ownCloud
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*
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* creates a hopefully unique name for owncloud based on the display name and the dn of the LDAP object
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*/
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static private function alternateOwnCloudName($name, $dn) {
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$ufn = ldap_dn2ufn($dn);
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$name = $name . '@' . trim(substr_replace($ufn, '', 0, strpos($ufn, ',')));
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$name = self::sanitizeUsername($name);
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return $name;
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}
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/**
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* @brief retrieves all known groups from the mappings table
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* @returns array with the results
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*
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* retrieves all known groups from the mappings table
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*/
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static private function mappedGroups() {
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return self::mappedComponents(false);
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}
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/**
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* @brief retrieves all known users from the mappings table
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* @returns array with the results
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*
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* retrieves all known users from the mappings table
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*/
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static private function mappedUsers() {
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return self::mappedComponents(true);
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}
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static private function mappedComponents($isUsers) {
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$table = self::getMapTable($isUsers);
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$query = OCP\DB::prepare('
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SELECT ldap_dn, owncloud_name
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FROM '. $table
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);
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return $query->execute()->fetchAll();
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}
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/**
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* @brief inserts a new user or group into the mappings table
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* @param $dn the record in question
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* @param $ocname the name to use in ownCloud
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* @param $isUser is it a user or a group?
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* @returns true on success, false otherwise
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*
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* inserts a new user or group into the mappings table
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*/
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static private function mapComponent($dn, $ocname, $isUser = true) {
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$table = self::getMapTable($isUser);
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$dn = self::sanitizeDN($dn);
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$sqlAdjustment = '';
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$dbtype = OCP\Config::getSystemValue('dbtype');
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if($dbtype == 'mysql') {
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$sqlAdjustment = 'FROM dual';
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}
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$insert = OCP\DB::prepare('
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INSERT INTO '.$table.' (ldap_dn, owncloud_name)
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SELECT ?,?
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'.$sqlAdjustment.'
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WHERE NOT EXISTS (
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SELECT 1
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FROM '.$table.'
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WHERE ldap_dn = ?
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OR owncloud_name = ? )
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');
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$res = $insert->execute(array($dn, $ocname, $dn, $ocname));
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if(OCP\DB::isError($res)) {
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return false;
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}
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$insRows = $res->numRows();
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if($insRows == 0) {
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return false;
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}
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return true;
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}
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static public function fetchListOfUsers($filter, $attr) {
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return self::fetchList(OC_LDAP::searchUsers($filter, $attr), (count($attr) > 1));
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}
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static public function fetchListOfGroups($filter, $attr) {
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return self::fetchList(OC_LDAP::searchGroups($filter, $attr), (count($attr) > 1));
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}
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static private function fetchList($list, $manyAttributes) {
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if(is_array($list)) {
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if($manyAttributes) {
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return $list;
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} else {
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return array_unique($list, SORT_LOCALE_STRING);
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}
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}
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//error cause actually, maybe throw an exception in future.
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return array();
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}
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/**
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* @brief reads a given attribute for an LDAP record identified by a DN
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* @param $dn the record in question
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* @param $attr the attribute that shall be retrieved
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* @returns the values in an array on success, false otherwise
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*
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* Reads an attribute from an LDAP entry
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*/
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static public function readAttribute($dn, $attr) {
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$cr = self::getConnectionResource();
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$rr = ldap_read($cr, $dn, 'objectClass=*', array($attr));
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$er = ldap_first_entry($cr, $rr);
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//LDAP attributes are not case sensitive
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$result = array_change_key_case(ldap_get_attributes($cr, $er));
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$attr = strtolower($attr);
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if(isset($result[$attr]) && $result[$attr]['count'] > 0){
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$values = array();
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for($i=0;$i<$result[$attr]['count'];$i++) {
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$values[] = $result[$attr][$i];
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}
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return $values;
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}
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return false;
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}
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/**
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* @brief executes an LDAP search, optimized for Users
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* @param $filter the LDAP filter for the search
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* @param $attr optional, when a certain attribute shall be filtered out
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* @returns array with the search result
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*
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* Executes an LDAP search
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*/
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static public function searchUsers($filter, $attr = null) {
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self::init();
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return self::search($filter, self::$ldapBaseUsers, $attr);
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}
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/**
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* @brief executes an LDAP search, optimized for Groups
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* @param $filter the LDAP filter for the search
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* @param $attr optional, when a certain attribute shall be filtered out
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* @returns array with the search result
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*
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* Executes an LDAP search
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*/
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static public function searchGroups($filter, $attr = null) {
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self::init();
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return self::search($filter, self::$ldapBaseGroups, $attr);
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}
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/**
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* @brief executes an LDAP search
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* @param $filter the LDAP filter for the search
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* @param $base the LDAP subtree that shall be searched
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* @param $attr optional, when a certain attribute shall be filtered out
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* @returns array with the search result
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*
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* Executes an LDAP search
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*/
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static private function search($filter, $base, $attr = null) {
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if(!is_null($attr) && !is_array($attr)) {
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$attr = array(strtolower($attr));
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}
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$sr = @ldap_search(self::getConnectionResource(), $base, $filter, $attr);
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$findings = @ldap_get_entries(self::getConnectionResource(), $sr );
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// if we're here, probably no connection ressource is returned.
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// to make ownCloud behave nicely, we simply give back an empty array.
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if(is_null($findings)) {
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return array();
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}
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if(!is_null($attr)) {
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$selection = array();
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$multiarray = false;
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if(count($attr) > 1) {
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$multiarray = true;
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$i = 0;
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}
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foreach($findings as $item) {
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if(!is_array($item)) {
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continue;
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}
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$item = array_change_key_case($item);
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if($multiarray) {
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foreach($attr as $key) {
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$key = strtolower($key);
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if(isset($item[$key])) {
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if($key != 'dn'){
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$selection[$i][$key] = $item[$key][0];
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} else {
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$selection[$i][$key] = self::sanitizeDN($item[$key]);
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}
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}
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}
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$i++;
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} else {
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//tribute to case insensitivity
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$key = strtolower($attr[0]);
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if(isset($item[$key])) {
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if($key == 'dn') {
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$selection[] = self::sanitizeDN($item[$key]);
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} else {
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$selection[] = $item[$key];
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}
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}
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}
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}
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return $selection;
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}
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return $findings;
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}
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static private function sanitizeDN($dn) {
|
||
//OID sometimes gives back DNs with whitespace after the comma a la "uid=foo, cn=bar, dn=..." We need to tackle this!
|
||
$dn = preg_replace('/([^\\\]),(\s+)/','\1,',$dn);
|
||
|
||
//make comparisons and everything work
|
||
$dn = strtolower($dn);
|
||
|
||
return $dn;
|
||
}
|
||
|
||
static private function sanitizeUsername($name) {
|
||
if(self::$ldapIgnoreNamingRules) {
|
||
return $name;
|
||
}
|
||
|
||
//REPLACEMENTS
|
||
$name = str_replace(' ', '_', $name);
|
||
|
||
//every remaining unallowed characters will be removed
|
||
$name = preg_replace('/[^a-zA-Z0-9_.@-]/', '', $name);
|
||
|
||
return $name;
|
||
}
|
||
|
||
/**
|
||
* @brief combines the input filters with AND
|
||
* @param $filters array, the filters to connect
|
||
* @returns the combined filter
|
||
*
|
||
* Combines Filter arguments with AND
|
||
*/
|
||
static public function combineFilterWithAnd($filters) {
|
||
return self::combineFilter($filters,'&');
|
||
}
|
||
|
||
/**
|
||
* @brief combines the input filters with AND
|
||
* @param $filters array, the filters to connect
|
||
* @returns the combined filter
|
||
*
|
||
* Combines Filter arguments with AND
|
||
*/
|
||
static public function combineFilterWithOr($filters) {
|
||
return self::combineFilter($filters,'|');
|
||
}
|
||
|
||
/**
|
||
* @brief combines the input filters with given operator
|
||
* @param $filters array, the filters to connect
|
||
* @param $operator either & or |
|
||
* @returns the combined filter
|
||
*
|
||
* Combines Filter arguments with AND
|
||
*/
|
||
static private function combineFilter($filters, $operator) {
|
||
$combinedFilter = '('.$operator;
|
||
foreach($filters as $filter) {
|
||
if($filter[0] != '(') {
|
||
$filter = '('.$filter.')';
|
||
}
|
||
$combinedFilter.=$filter;
|
||
}
|
||
$combinedFilter.=')';
|
||
return $combinedFilter;
|
||
}
|
||
|
||
/**
|
||
* Returns the LDAP handler
|
||
*/
|
||
static private function getConnectionResource() {
|
||
if(!self::$ldapConnectionRes) {
|
||
self::init();
|
||
}
|
||
if(is_null(self::$ldapConnectionRes)) {
|
||
OCP\Util::writeLog('ldap', 'Connection could not be established', OCP\Util::INFO);
|
||
}
|
||
return self::$ldapConnectionRes;
|
||
}
|
||
|
||
/**
|
||
* Caches the general LDAP configuration.
|
||
*/
|
||
static private function readConfiguration($force = false) {
|
||
if(!self::$configured || $force) {
|
||
self::$ldapHost = OCP\Config::getAppValue('user_ldap', 'ldap_host', '');
|
||
self::$ldapPort = OCP\Config::getAppValue('user_ldap', 'ldap_port', 389);
|
||
self::$ldapAgentName = OCP\Config::getAppValue('user_ldap', 'ldap_dn','');
|
||
self::$ldapAgentPassword = base64_decode(OCP\Config::getAppValue('user_ldap', 'ldap_agent_password',''));
|
||
self::$ldapBase = OCP\Config::getAppValue('user_ldap', 'ldap_base', '');
|
||
self::$ldapBaseUsers = OCP\Config::getAppValue('user_ldap', 'ldap_base_users',self::$ldapBase);
|
||
self::$ldapBaseGroups = OCP\Config::getAppValue('user_ldap', 'ldap_base_groups', self::$ldapBase);
|
||
self::$ldapTLS = OCP\Config::getAppValue('user_ldap', 'ldap_tls',0);
|
||
self::$ldapNoCase = OCP\Config::getAppValue('user_ldap', 'ldap_nocase', 0);
|
||
self::$ldapUserDisplayName = strtolower(OCP\Config::getAppValue('user_ldap', 'ldap_display_name', 'uid'));
|
||
self::$ldapUserFilter = OCP\Config::getAppValue('user_ldap', 'ldap_userlist_filter','objectClass=person');
|
||
self::$ldapLoginFilter = OCP\Config::getAppValue('user_ldap', 'ldap_login_filter', '(uid=%uid)');
|
||
self::$ldapGroupDisplayName = strtolower(OCP\Config::getAppValue('user_ldap', 'ldap_group_display_name', LDAP_GROUP_DISPLAY_NAME_ATTR));
|
||
self::$ldapIgnoreNamingRules = OCP\Config::getSystemValue('ldapIgnoreNamingRules', false);
|
||
|
||
if(empty(self::$ldapBaseUsers)) {
|
||
OCP\Util::writeLog('ldap', 'Base for Users is empty, using Base DN', OCP\Util::INFO);
|
||
self::$ldapBaseUsers = self::$ldapBase;
|
||
}
|
||
if(empty(self::$ldapBaseGroups)) {
|
||
OCP\Util::writeLog('ldap', 'Base for Groups is empty, using Base DN', OCP\Util::INFO);
|
||
self::$ldapBaseGroups = self::$ldapBase;
|
||
}
|
||
|
||
if(
|
||
!empty(self::$ldapHost)
|
||
&& !empty(self::$ldapPort)
|
||
&& (
|
||
(!empty(self::$ldapAgentName) && !empty(self::$ldapAgentPassword))
|
||
|| ( empty(self::$ldapAgentName) && empty(self::$ldapAgentPassword))
|
||
)
|
||
&& !empty(self::$ldapBase)
|
||
&& !empty(self::$ldapUserDisplayName)
|
||
)
|
||
{
|
||
self::$configured = true;
|
||
}
|
||
}
|
||
}
|
||
|
||
/**
|
||
* Connects and Binds to LDAP
|
||
*/
|
||
static private function establishConnection() {
|
||
if(!self::$configured) {
|
||
OCP\Util::writeLog('ldap', 'Configuration is invalid, cannot connect', OCP\Util::INFO);
|
||
return false;
|
||
}
|
||
if(!self::$ldapConnectionRes) {
|
||
self::$ldapConnectionRes = ldap_connect(self::$ldapHost, self::$ldapPort);
|
||
if(ldap_set_option(self::$ldapConnectionRes, LDAP_OPT_PROTOCOL_VERSION, 3)) {
|
||
if(ldap_set_option(self::$ldapConnectionRes, LDAP_OPT_REFERRALS, 0)) {
|
||
if(self::$ldapTLS) {
|
||
ldap_start_tls(self::$ldapConnectionRes);
|
||
}
|
||
}
|
||
}
|
||
|
||
$ldapLogin = @ldap_bind(self::$ldapConnectionRes, self::$ldapAgentName, self::$ldapAgentPassword );
|
||
if(!$ldapLogin) {
|
||
OCP\Util::writeLog('ldap', 'Bind failed: ' . ldap_errno(self::$ldapConnectionRes) . ': ' . ldap_error(self::$ldapConnectionRes), OCP\Util::ERROR);
|
||
return false;
|
||
}
|
||
}
|
||
}
|
||
|
||
static public function areCredentialsValid($name, $password) {
|
||
return @ldap_bind(self::getConnectionResource(), $name, $password);
|
||
}
|
||
|
||
/**
|
||
* taken from http://www.php.net/manual/en/function.array-search.php#97645
|
||
* TODO: move somewhere, where its better placed since it is not LDAP specific. OC_Helper maybe?
|
||
*/
|
||
static public function recursiveArraySearch($haystack, $needle, $index = null) {
|
||
$aIt = new RecursiveArrayIterator($haystack);
|
||
$it = new RecursiveIteratorIterator($aIt);
|
||
|
||
while($it->valid()) {
|
||
if (((isset($index) AND ($it->key() == $index)) OR (!isset($index))) AND ($it->current() == $needle)) {
|
||
return $aIt->key();
|
||
}
|
||
|
||
$it->next();
|
||
}
|
||
|
||
return false;
|
||
}
|
||
|
||
}
|