666 lines
19 KiB
PHP
666 lines
19 KiB
PHP
<?php
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/**
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* @copyright Copyright (c) 2016, ownCloud, Inc.
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*
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* @author Arthur Schiwon <blizzz@arthur-schiwon.de>
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* @author Bart Visscher <bartv@thisnet.nl>
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* @author Brent Bloxam <brent.bloxam@gmail.com>
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* @author Jarkko Lehtoranta <devel@jlranta.com>
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* @author Joas Schilling <coding@schilljs.com>
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* @author Jörn Friedrich Dreyer <jfd@butonic.de>
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* @author Lukas Reschke <lukas@statuscode.ch>
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* @author Lyonel Vincent <lyonel@ezix.org>
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* @author Morris Jobke <hey@morrisjobke.de>
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* @author Robin Appelman <robin@icewind.nl>
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* @author Robin McCorkell <robin@mccorkell.me.uk>
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* @author Roeland Jago Douma <roeland@famdouma.nl>
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* @author root <root@localhost.localdomain>
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* @author Victor Dubiniuk <dubiniuk@owncloud.com>
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* @author Xuanwo <xuanwo@yunify.com>
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*
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* @license AGPL-3.0
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*
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* This code is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License, version 3,
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* as published by the Free Software Foundation.
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*
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* This program 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 License, version 3,
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* along with this program. If not, see <http://www.gnu.org/licenses/>
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*
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*/
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namespace OCA\User_LDAP;
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use OC\ServerNotAvailableException;
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/**
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* magic properties (incomplete)
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* responsible for LDAP connections in context with the provided configuration
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*
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* @property string ldapHost
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* @property string ldapPort holds the port number
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* @property string ldapUserFilter
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* @property string ldapUserDisplayName
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* @property string ldapUserDisplayName2
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* @property boolean turnOnPasswordChange
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* @property boolean hasPagedResultSupport
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* @property string[] ldapBaseUsers
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* @property int|null ldapPagingSize holds an integer
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* @property bool|mixed|void ldapGroupMemberAssocAttr
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* @property string ldapUuidUserAttribute
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* @property string ldapUuidGroupAttribute
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* @property string ldapExpertUUIDUserAttr
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* @property string ldapExpertUUIDGroupAttr
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*/
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class Connection extends LDAPUtility {
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private $ldapConnectionRes = null;
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private $configPrefix;
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private $configID;
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private $configured = false;
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private $hasPagedResultSupport = true;
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//whether connection should be kept on __destruct
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private $dontDestruct = false;
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/**
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* @var bool runtime flag that indicates whether supported primary groups are available
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*/
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public $hasPrimaryGroups = true;
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/**
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* @var bool runtime flag that indicates whether supported POSIX gidNumber are available
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*/
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public $hasGidNumber = true;
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//cache handler
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protected $cache;
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/** @var Configuration settings handler **/
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protected $configuration;
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protected $doNotValidate = false;
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protected $ignoreValidation = false;
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protected $bindResult = [];
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/**
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* Constructor
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* @param ILDAPWrapper $ldap
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* @param string $configPrefix a string with the prefix for the configkey column (appconfig table)
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* @param string|null $configID a string with the value for the appid column (appconfig table) or null for on-the-fly connections
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*/
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public function __construct(ILDAPWrapper $ldap, $configPrefix = '', $configID = 'user_ldap') {
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parent::__construct($ldap);
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$this->configPrefix = $configPrefix;
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$this->configID = $configID;
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$this->configuration = new Configuration($configPrefix,
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!is_null($configID));
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$memcache = \OC::$server->getMemCacheFactory();
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if($memcache->isAvailable()) {
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$this->cache = $memcache->createDistributed();
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}
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$helper = new Helper(\OC::$server->getConfig());
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$this->doNotValidate = !in_array($this->configPrefix,
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$helper->getServerConfigurationPrefixes());
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$this->hasPagedResultSupport =
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(int)$this->configuration->ldapPagingSize !== 0
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|| $this->ldap->hasPagedResultSupport();
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}
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public function __destruct() {
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if(!$this->dontDestruct && $this->ldap->isResource($this->ldapConnectionRes)) {
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@$this->ldap->unbind($this->ldapConnectionRes);
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$this->bindResult = [];
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}
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}
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/**
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* defines behaviour when the instance is cloned
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*/
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public function __clone() {
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$this->configuration = new Configuration($this->configPrefix,
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!is_null($this->configID));
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$this->ldapConnectionRes = null;
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$this->dontDestruct = true;
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}
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/**
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* @param string $name
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* @return bool|mixed
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*/
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public function __get($name) {
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if(!$this->configured) {
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$this->readConfiguration();
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}
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if($name === 'hasPagedResultSupport') {
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return $this->hasPagedResultSupport;
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}
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return $this->configuration->$name;
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}
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/**
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* @param string $name
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* @param mixed $value
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*/
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public function __set($name, $value) {
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$this->doNotValidate = false;
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$before = $this->configuration->$name;
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$this->configuration->$name = $value;
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$after = $this->configuration->$name;
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if($before !== $after) {
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if ($this->configID !== '' && $this->configID !== null) {
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$this->configuration->saveConfiguration();
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}
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$this->validateConfiguration();
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}
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}
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/**
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* sets whether the result of the configuration validation shall
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* be ignored when establishing the connection. Used by the Wizard
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* in early configuration state.
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* @param bool $state
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*/
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public function setIgnoreValidation($state) {
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$this->ignoreValidation = (bool)$state;
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}
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/**
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* initializes the LDAP backend
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* @param bool $force read the config settings no matter what
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*/
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public function init($force = false) {
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$this->readConfiguration($force);
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$this->establishConnection();
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}
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/**
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* Returns the LDAP handler
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*/
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public function getConnectionResource() {
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if(!$this->ldapConnectionRes) {
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$this->init();
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} else if(!$this->ldap->isResource($this->ldapConnectionRes)) {
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$this->ldapConnectionRes = null;
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$this->establishConnection();
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}
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if(is_null($this->ldapConnectionRes)) {
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\OCP\Util::writeLog('user_ldap', 'No LDAP Connection to server ' . $this->configuration->ldapHost, \OCP\Util::ERROR);
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throw new ServerNotAvailableException('Connection to LDAP server could not be established');
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}
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return $this->ldapConnectionRes;
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}
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/**
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* resets the connection resource
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*/
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public function resetConnectionResource() {
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if(!is_null($this->ldapConnectionRes)) {
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@$this->ldap->unbind($this->ldapConnectionRes);
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$this->ldapConnectionRes = null;
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$this->bindResult = [];
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}
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}
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/**
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* @param string|null $key
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* @return string
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*/
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private function getCacheKey($key) {
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$prefix = 'LDAP-'.$this->configID.'-'.$this->configPrefix.'-';
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if(is_null($key)) {
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return $prefix;
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}
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return $prefix.hash('sha256', $key);
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}
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/**
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* @param string $key
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* @return mixed|null
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*/
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public function getFromCache($key) {
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if(!$this->configured) {
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$this->readConfiguration();
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}
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if(is_null($this->cache) || !$this->configuration->ldapCacheTTL) {
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return null;
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}
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$key = $this->getCacheKey($key);
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return json_decode(base64_decode($this->cache->get($key)), true);
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}
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/**
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* @param string $key
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* @param mixed $value
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*
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* @return string
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*/
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public function writeToCache($key, $value) {
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if(!$this->configured) {
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$this->readConfiguration();
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}
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if(is_null($this->cache)
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|| !$this->configuration->ldapCacheTTL
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|| !$this->configuration->ldapConfigurationActive) {
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return null;
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}
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$key = $this->getCacheKey($key);
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$value = base64_encode(json_encode($value));
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$this->cache->set($key, $value, $this->configuration->ldapCacheTTL);
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}
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public function clearCache() {
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if(!is_null($this->cache)) {
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$this->cache->clear($this->getCacheKey(null));
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}
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}
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/**
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* Caches the general LDAP configuration.
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* @param bool $force optional. true, if the re-read should be forced. defaults
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* to false.
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* @return null
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*/
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private function readConfiguration($force = false) {
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if((!$this->configured || $force) && !is_null($this->configID)) {
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$this->configuration->readConfiguration();
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$this->configured = $this->validateConfiguration();
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}
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}
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/**
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* set LDAP configuration with values delivered by an array, not read from configuration
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* @param array $config array that holds the config parameters in an associated array
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* @param array &$setParameters optional; array where the set fields will be given to
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* @return boolean true if config validates, false otherwise. Check with $setParameters for detailed success on single parameters
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*/
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public function setConfiguration($config, &$setParameters = null) {
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if(is_null($setParameters)) {
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$setParameters = array();
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}
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$this->doNotValidate = false;
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$this->configuration->setConfiguration($config, $setParameters);
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if(count($setParameters) > 0) {
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$this->configured = $this->validateConfiguration();
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}
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return $this->configured;
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}
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/**
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* saves the current Configuration in the database and empties the
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* cache
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* @return null
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*/
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public function saveConfiguration() {
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$this->configuration->saveConfiguration();
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$this->clearCache();
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}
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/**
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* get the current LDAP configuration
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* @return array
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*/
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public function getConfiguration() {
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$this->readConfiguration();
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$config = $this->configuration->getConfiguration();
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$cta = $this->configuration->getConfigTranslationArray();
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$result = array();
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foreach($cta as $dbkey => $configkey) {
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switch($configkey) {
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case 'homeFolderNamingRule':
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if(strpos($config[$configkey], 'attr:') === 0) {
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$result[$dbkey] = substr($config[$configkey], 5);
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} else {
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$result[$dbkey] = '';
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}
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break;
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case 'ldapBase':
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case 'ldapBaseUsers':
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case 'ldapBaseGroups':
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case 'ldapAttributesForUserSearch':
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case 'ldapAttributesForGroupSearch':
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if(is_array($config[$configkey])) {
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$result[$dbkey] = implode("\n", $config[$configkey]);
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break;
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} //else follows default
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default:
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$result[$dbkey] = $config[$configkey];
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}
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}
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return $result;
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}
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private function doSoftValidation() {
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//if User or Group Base are not set, take over Base DN setting
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foreach(array('ldapBaseUsers', 'ldapBaseGroups') as $keyBase) {
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$val = $this->configuration->$keyBase;
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if(empty($val)) {
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$this->configuration->$keyBase = $this->configuration->ldapBase;
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}
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}
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foreach(array('ldapExpertUUIDUserAttr' => 'ldapUuidUserAttribute',
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'ldapExpertUUIDGroupAttr' => 'ldapUuidGroupAttribute')
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as $expertSetting => $effectiveSetting) {
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$uuidOverride = $this->configuration->$expertSetting;
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if(!empty($uuidOverride)) {
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$this->configuration->$effectiveSetting = $uuidOverride;
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} else {
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$uuidAttributes = Access::UUID_ATTRIBUTES;
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array_unshift($uuidAttributes, 'auto');
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if(!in_array($this->configuration->$effectiveSetting,
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$uuidAttributes)
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&& (!is_null($this->configID))) {
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$this->configuration->$effectiveSetting = 'auto';
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$this->configuration->saveConfiguration();
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\OCP\Util::writeLog('user_ldap',
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'Illegal value for the '.
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$effectiveSetting.', '.'reset to '.
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'autodetect.', \OCP\Util::INFO);
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}
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}
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}
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$backupPort = (int)$this->configuration->ldapBackupPort;
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if ($backupPort <= 0) {
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$this->configuration->backupPort = $this->configuration->ldapPort;
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}
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//make sure empty search attributes are saved as simple, empty array
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$saKeys = array('ldapAttributesForUserSearch',
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'ldapAttributesForGroupSearch');
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foreach($saKeys as $key) {
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$val = $this->configuration->$key;
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if(is_array($val) && count($val) === 1 && empty($val[0])) {
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$this->configuration->$key = array();
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}
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}
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if((stripos($this->configuration->ldapHost, 'ldaps://') === 0)
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&& $this->configuration->ldapTLS) {
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$this->configuration->ldapTLS = false;
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\OCP\Util::writeLog('user_ldap',
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'LDAPS (already using secure connection) and '.
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'TLS do not work together. Switched off TLS.',
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\OCP\Util::INFO);
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}
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}
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/**
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* @return bool
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*/
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private function doCriticalValidation() {
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$configurationOK = true;
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$errorStr = 'Configuration Error (prefix '.
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(string)$this->configPrefix .'): ';
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//options that shall not be empty
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$options = array('ldapHost', 'ldapPort', 'ldapUserDisplayName',
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'ldapGroupDisplayName', 'ldapLoginFilter');
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foreach($options as $key) {
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$val = $this->configuration->$key;
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if(empty($val)) {
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switch($key) {
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case 'ldapHost':
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$subj = 'LDAP Host';
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break;
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case 'ldapPort':
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$subj = 'LDAP Port';
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break;
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case 'ldapUserDisplayName':
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$subj = 'LDAP User Display Name';
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break;
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case 'ldapGroupDisplayName':
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$subj = 'LDAP Group Display Name';
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break;
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case 'ldapLoginFilter':
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$subj = 'LDAP Login Filter';
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break;
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default:
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$subj = $key;
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break;
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}
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$configurationOK = false;
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\OCP\Util::writeLog('user_ldap',
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$errorStr.'No '.$subj.' given!',
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\OCP\Util::WARN);
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}
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}
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//combinations
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$agent = $this->configuration->ldapAgentName;
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$pwd = $this->configuration->ldapAgentPassword;
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if (
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($agent === '' && $pwd !== '')
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|| ($agent !== '' && $pwd === '')
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) {
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\OCP\Util::writeLog('user_ldap',
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$errorStr.'either no password is given for the '.
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'user agent or a password is given, but not an '.
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'LDAP agent.',
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\OCP\Util::WARN);
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$configurationOK = false;
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}
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$base = $this->configuration->ldapBase;
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$baseUsers = $this->configuration->ldapBaseUsers;
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$baseGroups = $this->configuration->ldapBaseGroups;
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if(empty($base) && empty($baseUsers) && empty($baseGroups)) {
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\OCP\Util::writeLog('user_ldap',
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$errorStr.'Not a single Base DN given.',
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\OCP\Util::WARN);
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$configurationOK = false;
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}
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if(mb_strpos($this->configuration->ldapLoginFilter, '%uid', 0, 'UTF-8')
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=== false) {
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\OCP\Util::writeLog('user_ldap',
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$errorStr.'login filter does not contain %uid '.
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'place holder.',
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\OCP\Util::WARN);
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$configurationOK = false;
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}
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return $configurationOK;
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}
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/**
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* Validates the user specified configuration
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* @return bool true if configuration seems OK, false otherwise
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*/
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private function validateConfiguration() {
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if($this->doNotValidate) {
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//don't do a validation if it is a new configuration with pure
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//default values. Will be allowed on changes via __set or
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//setConfiguration
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return false;
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}
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// first step: "soft" checks: settings that are not really
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// necessary, but advisable. If left empty, give an info message
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$this->doSoftValidation();
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//second step: critical checks. If left empty or filled wrong, mark as
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//not configured and give a warning.
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return $this->doCriticalValidation();
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}
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/**
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* Connects and Binds to LDAP
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*/
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private function establishConnection() {
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if(!$this->configuration->ldapConfigurationActive) {
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return null;
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}
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static $phpLDAPinstalled = true;
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if(!$phpLDAPinstalled) {
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return false;
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}
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if(!$this->ignoreValidation && !$this->configured) {
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\OCP\Util::writeLog('user_ldap',
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'Configuration is invalid, cannot connect',
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\OCP\Util::WARN);
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return false;
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}
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if(!$this->ldapConnectionRes) {
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if(!$this->ldap->areLDAPFunctionsAvailable()) {
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$phpLDAPinstalled = false;
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\OCP\Util::writeLog('user_ldap',
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'function ldap_connect is not available. Make '.
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'sure that the PHP ldap module is installed.',
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\OCP\Util::ERROR);
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return false;
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}
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if($this->configuration->turnOffCertCheck) {
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if(putenv('LDAPTLS_REQCERT=never')) {
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\OCP\Util::writeLog('user_ldap',
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'Turned off SSL certificate validation successfully.',
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\OCP\Util::DEBUG);
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} else {
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\OCP\Util::writeLog('user_ldap',
|
|
'Could not turn off SSL certificate validation.',
|
|
\OCP\Util::WARN);
|
|
}
|
|
}
|
|
|
|
$isOverrideMainServer = ($this->configuration->ldapOverrideMainServer
|
|
|| $this->getFromCache('overrideMainServer'));
|
|
$isBackupHost = (trim($this->configuration->ldapBackupHost) !== "");
|
|
$bindStatus = false;
|
|
$error = -1;
|
|
try {
|
|
if (!$isOverrideMainServer) {
|
|
$this->doConnect($this->configuration->ldapHost,
|
|
$this->configuration->ldapPort);
|
|
$bindStatus = $this->bind();
|
|
$error = $this->ldap->isResource($this->ldapConnectionRes) ?
|
|
$this->ldap->errno($this->ldapConnectionRes) : -1;
|
|
}
|
|
if($bindStatus === true) {
|
|
return $bindStatus;
|
|
}
|
|
} catch (ServerNotAvailableException $e) {
|
|
if(!$isBackupHost) {
|
|
throw $e;
|
|
}
|
|
}
|
|
|
|
//if LDAP server is not reachable, try the Backup (Replica!) Server
|
|
if($isBackupHost && ($error !== 0 || $isOverrideMainServer)) {
|
|
$this->doConnect($this->configuration->ldapBackupHost,
|
|
$this->configuration->ldapBackupPort);
|
|
$this->bindResult = [];
|
|
$bindStatus = $this->bind();
|
|
$error = $this->ldap->isResource($this->ldapConnectionRes) ?
|
|
$this->ldap->errno($this->ldapConnectionRes) : -1;
|
|
if($bindStatus && $error === 0 && !$this->getFromCache('overrideMainServer')) {
|
|
//when bind to backup server succeeded and failed to main server,
|
|
//skip contacting him until next cache refresh
|
|
$this->writeToCache('overrideMainServer', true);
|
|
}
|
|
}
|
|
|
|
return $bindStatus;
|
|
}
|
|
return null;
|
|
}
|
|
|
|
/**
|
|
* @param string $host
|
|
* @param string $port
|
|
* @return bool
|
|
* @throws \OC\ServerNotAvailableException
|
|
*/
|
|
private function doConnect($host, $port) {
|
|
if ($host === '') {
|
|
return false;
|
|
}
|
|
|
|
$this->ldapConnectionRes = $this->ldap->connect($host, $port);
|
|
|
|
if(!$this->ldap->setOption($this->ldapConnectionRes, LDAP_OPT_PROTOCOL_VERSION, 3)) {
|
|
throw new ServerNotAvailableException('Could not set required LDAP Protocol version.');
|
|
}
|
|
|
|
if(!$this->ldap->setOption($this->ldapConnectionRes, LDAP_OPT_REFERRALS, 0)) {
|
|
throw new ServerNotAvailableException('Could not disable LDAP referrals.');
|
|
}
|
|
|
|
if($this->configuration->ldapTLS) {
|
|
if(!$this->ldap->startTls($this->ldapConnectionRes)) {
|
|
throw new ServerNotAvailableException('Start TLS failed, when connecting to LDAP host ' . $host . '.');
|
|
}
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Binds to LDAP
|
|
*/
|
|
public function bind() {
|
|
if(!$this->configuration->ldapConfigurationActive) {
|
|
return false;
|
|
}
|
|
$cr = $this->ldapConnectionRes;
|
|
if(!$this->ldap->isResource($cr)) {
|
|
$cr = $this->getConnectionResource();
|
|
}
|
|
|
|
if(
|
|
count($this->bindResult) !== 0
|
|
&& $this->bindResult['dn'] === $this->configuration->ldapAgentName
|
|
&& \OC::$server->getHasher()->verify(
|
|
$this->configPrefix . $this->configuration->ldapAgentPassword,
|
|
$this->bindResult['hash']
|
|
)
|
|
) {
|
|
// don't attempt to bind again with the same data as before
|
|
// bind might have been invoked via getConnectionResource(),
|
|
// but we need results specifically for e.g. user login
|
|
return $this->bindResult['result'];
|
|
}
|
|
|
|
$ldapLogin = @$this->ldap->bind($cr,
|
|
$this->configuration->ldapAgentName,
|
|
$this->configuration->ldapAgentPassword);
|
|
|
|
$this->bindResult = [
|
|
'dn' => $this->configuration->ldapAgentName,
|
|
'hash' => \OC::$server->getHasher()->hash($this->configPrefix . $this->configuration->ldapAgentPassword),
|
|
'result' => $ldapLogin,
|
|
];
|
|
|
|
if(!$ldapLogin) {
|
|
$errno = $this->ldap->errno($cr);
|
|
|
|
\OCP\Util::writeLog('user_ldap',
|
|
'Bind failed: ' . $errno . ': ' . $this->ldap->error($cr),
|
|
\OCP\Util::WARN);
|
|
|
|
// Set to failure mode, if LDAP error code is not LDAP_SUCCESS or LDAP_INVALID_CREDENTIALS
|
|
if($errno !== 0x00 && $errno !== 0x31) {
|
|
$this->ldapConnectionRes = null;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
}
|