547 lines
16 KiB
PHP
547 lines
16 KiB
PHP
<?php
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/**
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* ownCloud – LDAP Connection
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*
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* @author Arthur Schiwon
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* @copyright 2012, 2013 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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namespace OCA\user_ldap\lib;
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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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//whether connection should be kept on __destruct
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private $dontDestruct = false;
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private $hasPagedResultSupport = true;
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//cache handler
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protected $cache;
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//settings handler
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protected $configuration;
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protected $doNotValidate = false;
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/**
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* @brief Constructor
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* @param $configPrefix a string with the prefix for the configkey column (appconfig table)
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* @param $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 = $memcache->create();
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} else {
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$this->cache = \OC_Cache::getGlobalCache();
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}
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$this->hasPagedResultSupport =
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$this->ldap->hasPagedResultSupport();
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$this->doNotValidate = !in_array($this->configPrefix,
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Helper::getServerConfigurationPrefixes());
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}
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public function __destruct() {
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if(!$this->dontDestruct &&
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$this->ldap->isResource($this->ldapConnectionRes)) {
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@$this->ldap->unbind($this->ldapConnectionRes);
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};
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}
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/**
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* @brief defines behaviour when the instance is cloned
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*/
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public function __clone() {
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//a cloned instance inherits the connection resource. It may use it,
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//but it may not disconnect it
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$this->dontDestruct = true;
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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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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 !== $after) {
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if(!empty($this->configID)) {
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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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* @brief initializes the LDAP backend
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* @param $force read the config settings no matter what
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*
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* initializes the LDAP backend
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*/
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public function init($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', 'Connection could not be established', \OCP\Util::ERROR);
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}
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return $this->ldapConnectionRes;
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}
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private function getCacheKey($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 $prefix.md5($key);
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}
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public function getFromCache($key) {
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if(!$this->configured) {
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$this->readConfiguration();
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}
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if(!$this->configuration->ldapCacheTTL) {
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return null;
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}
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if(!$this->isCached($key)) {
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return null;
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}
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$key = $this->getCacheKey($key);
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return unserialize(base64_decode($this->cache->get($key)));
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}
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public function isCached($key) {
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if(!$this->configured) {
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$this->readConfiguration();
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}
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if(!$this->configuration->ldapCacheTTL) {
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return false;
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}
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$key = $this->getCacheKey($key);
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return $this->cache->hasKey($key);
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}
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public function writeToCache($key, $value) {
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if(!$this->configured) {
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$this->readConfiguration();
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}
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if(!$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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$value = base64_encode(serialize($value));
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$this->cache->set($key, $value, $this->configuration->ldapCacheTTL);
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}
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public function clearCache() {
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$this->cache->clear($this->getCacheKey(null));
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}
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/**
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* @brief Caches the general LDAP configuration.
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* @param $force optional. true, if the re-read should be forced. defaults
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* to false.
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* @return null
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*/
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private function readConfiguration($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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* @brief set LDAP configuration with values delivered by an array, not read from configuration
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* @param $config array that holds the config parameters in an associated array
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* @param &$setParameters optional; array where the set fields will be given to
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* @return 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 $this->configured;
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}
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/**
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* @brief saves the current Configuration in the database and empties the
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* cache
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* @return null
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*/
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public function saveConfiguration() {
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$this->configuration->saveConfiguration();
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$this->clearCache();
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}
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/**
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* @brief get the current LDAP configuration
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* @return array
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*/
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public function getConfiguration() {
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$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($val)) {
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$obj = strpos('Users', $keyBase) !== false ? 'Users' : 'Groups';
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\OCP\Util::writeLog('user_ldap',
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'Base tree for '.$obj.
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' is empty, using Base DN',
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\OCP\Util::INFO);
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$this->configuration->$keyBase = $this->configuration->ldapBase;
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}
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}
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$groupFilter = $this->configuration->ldapGroupFilter;
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if(empty($groupFilter)) {
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\OCP\Util::writeLog('user_ldap',
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'No group filter is specified, LDAP group '.
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'feature will not be used.',
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\OCP\Util::INFO);
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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 = array('auto', 'entryuuid', 'nsuniqueid',
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'objectguid', 'guid');
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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 = $this->configuration->ldapBackupPort;
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if(empty($backupPort)) {
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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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private function doCriticalValidation() {
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$configurationOK = true;
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$errorStr = 'Configuration Error (prefix '.
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strval($this->configPrefix).'): ';
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//options that shall not be empty
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$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 = $this->configuration->ldapAgentPassword;
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if((empty($agent) && !empty($pwd)) || (!empty($agent) && empty($pwd))) {
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\OCP\Util::writeLog('user_ldap',
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$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 $configurationOK;
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}
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/**
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* @brief Validates the user specified configuration
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* @returns true if configuration seems OK, false otherwise
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*/
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private function validateConfiguration() {
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if($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, set as
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//unconfigured 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(!$this->configured) {
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\OCP\Util::writeLog('user_ldap',
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'Configuration is invalid, cannot connect',
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\OCP\Util::WARN);
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return false;
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}
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if(!$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($this->configuration->turnOffCertCheck) {
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if(putenv('LDAPTLS_REQCERT=never')) {
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\OCP\Util::writeLog('user_ldap',
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'Turned off SSL certificate validation successfully.',
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\OCP\Util::WARN);
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} else {
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\OCP\Util::writeLog('user_ldap',
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'Could not turn off SSL certificate validation.',
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\OCP\Util::WARN);
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}
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}
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if(!$this->configuration->ldapOverrideMainServer
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&& !$this->getFromCache('overrideMainServer')) {
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$this->doConnect($this->configuration->ldapHost,
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$this->configuration->ldapPort);
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$bindStatus = $this->bind();
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$error = $this->ldap->isResource($this->ldapConnectionRes) ?
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$this->ldap->errno($this->ldapConnectionRes) : -1;
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} else {
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$bindStatus = false;
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$error = null;
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}
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//if LDAP server is not reachable, try the Backup (Replica!) Server
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if((!$bindStatus && ($error !== 0))
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|| $this->configuration->ldapOverrideMainServer
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|| $this->getFromCache('overrideMainServer')) {
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$this->doConnect($this->configuration->ldapBackupHost,
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$this->configuration->ldapBackupPort);
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$bindStatus = $this->bind();
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if(!$bindStatus && $error === -1) {
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//when bind to backup server succeeded and failed to main server,
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//skip contacting him until next cache refresh
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$this->writeToCache('overrideMainServer', true);
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}
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}
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return $bindStatus;
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}
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}
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private function doConnect($host, $port) {
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if(empty($host)) {
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return false;
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}
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if(strpos($host, '://') !== false) {
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//ldap_connect ignores port paramater when URLs are passed
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$host .= ':' . $port;
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}
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$this->ldapConnectionRes = $this->ldap->connect($host, $port);
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if($this->ldap->setOption($this->ldapConnectionRes, LDAP_OPT_PROTOCOL_VERSION, 3)) {
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if($this->ldap->setOption($this->ldapConnectionRes, LDAP_OPT_REFERRALS, 0)) {
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if($this->configuration->ldapTLS) {
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$this->ldap->startTls($this->ldapConnectionRes);
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}
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}
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}
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}
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/**
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* Binds to LDAP
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*/
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public function bind() {
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static $getConnectionResourceAttempt = false;
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if(!$this->configuration->ldapConfigurationActive) {
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return false;
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}
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if($getConnectionResourceAttempt) {
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$getConnectionResourceAttempt = false;
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return false;
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}
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$getConnectionResourceAttempt = true;
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$cr = $this->getConnectionResource();
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$getConnectionResourceAttempt = false;
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if(!$this->ldap->isResource($cr)) {
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return false;
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}
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$ldapLogin = @$this->ldap->bind($cr,
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$this->configuration->ldapAgentName,
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$this->configuration->ldapAgentPassword);
|
||
if(!$ldapLogin) {
|
||
\OCP\Util::writeLog('user_ldap',
|
||
'Bind failed: ' . $this->ldap->errno($cr) . ': ' . $this->ldap->error($cr),
|
||
\OCP\Util::ERROR);
|
||
$this->ldapConnectionRes = null;
|
||
return false;
|
||
}
|
||
return true;
|
||
}
|
||
|
||
}
|