nextcloud/apps/user_ldap/lib/connection.php

547 lines
16 KiB
PHP
Raw Blame History

This file contains ambiguous Unicode characters

This file contains Unicode characters that might be confused with other characters. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.

<?php
/**
* ownCloud LDAP Connection
*
* @author Arthur Schiwon
* @copyright 2012, 2013 Arthur Schiwon blizzz@owncloud.com
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
* License as published by the Free Software Foundation; either
* version 3 of the License, or any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU AFFERO GENERAL PUBLIC LICENSE for more details.
*
* You should have received a copy of the GNU Affero General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*
*/
namespace OCA\user_ldap\lib;
class Connection extends LDAPUtility {
private $ldapConnectionRes = null;
private $configPrefix;
private $configID;
private $configured = false;
//whether connection should be kept on __destruct
private $dontDestruct = false;
private $hasPagedResultSupport = true;
//cache handler
protected $cache;
//settings handler
protected $configuration;
protected $doNotValidate = false;
/**
* @brief Constructor
* @param $configPrefix a string with the prefix for the configkey column (appconfig table)
* @param $configID a string with the value for the appid column (appconfig table) or null for on-the-fly connections
*/
public function __construct(ILDAPWrapper $ldap, $configPrefix = '', $configID = 'user_ldap') {
parent::__construct($ldap);
$this->configPrefix = $configPrefix;
$this->configID = $configID;
$this->configuration = new Configuration($configPrefix,
!is_null($configID));
$memcache = \OC::$server->getMemCacheFactory();
if($memcache->isAvailable()) {
$this->cache = $memcache->create();
} else {
$this->cache = \OC_Cache::getGlobalCache();
}
$this->hasPagedResultSupport =
$this->ldap->hasPagedResultSupport();
$this->doNotValidate = !in_array($this->configPrefix,
Helper::getServerConfigurationPrefixes());
}
public function __destruct() {
if(!$this->dontDestruct &&
$this->ldap->isResource($this->ldapConnectionRes)) {
@$this->ldap->unbind($this->ldapConnectionRes);
};
}
/**
* @brief defines behaviour when the instance is cloned
*/
public function __clone() {
//a cloned instance inherits the connection resource. It may use it,
//but it may not disconnect it
$this->dontDestruct = true;
}
public function __get($name) {
if(!$this->configured) {
$this->readConfiguration();
}
if($name === 'hasPagedResultSupport') {
return $this->hasPagedResultSupport;
}
return $this->configuration->$name;
}
public function __set($name, $value) {
$this->doNotValidate = false;
$before = $this->configuration->$name;
$this->configuration->$name = $value;
$after = $this->configuration->$name;
if($before !== $after) {
if(!empty($this->configID)) {
$this->configuration->saveConfiguration();
}
$this->validateConfiguration();
}
}
/**
* @brief initializes the LDAP backend
* @param $force read the config settings no matter what
*
* initializes the LDAP backend
*/
public function init($force = false) {
$this->readConfiguration($force);
$this->establishConnection();
}
/**
* Returns the LDAP handler
*/
public function getConnectionResource() {
if(!$this->ldapConnectionRes) {
$this->init();
} else if(!$this->ldap->isResource($this->ldapConnectionRes)) {
$this->ldapConnectionRes = null;
$this->establishConnection();
}
if(is_null($this->ldapConnectionRes)) {
\OCP\Util::writeLog('user_ldap', 'Connection could not be established', \OCP\Util::ERROR);
}
return $this->ldapConnectionRes;
}
private function getCacheKey($key) {
$prefix = 'LDAP-'.$this->configID.'-'.$this->configPrefix.'-';
if(is_null($key)) {
return $prefix;
}
return $prefix.md5($key);
}
public function getFromCache($key) {
if(!$this->configured) {
$this->readConfiguration();
}
if(!$this->configuration->ldapCacheTTL) {
return null;
}
if(!$this->isCached($key)) {
return null;
}
$key = $this->getCacheKey($key);
return unserialize(base64_decode($this->cache->get($key)));
}
public function isCached($key) {
if(!$this->configured) {
$this->readConfiguration();
}
if(!$this->configuration->ldapCacheTTL) {
return false;
}
$key = $this->getCacheKey($key);
return $this->cache->hasKey($key);
}
public function writeToCache($key, $value) {
if(!$this->configured) {
$this->readConfiguration();
}
if(!$this->configuration->ldapCacheTTL
|| !$this->configuration->ldapConfigurationActive) {
return null;
}
$key = $this->getCacheKey($key);
$value = base64_encode(serialize($value));
$this->cache->set($key, $value, $this->configuration->ldapCacheTTL);
}
public function clearCache() {
$this->cache->clear($this->getCacheKey(null));
}
/**
* @brief Caches the general LDAP configuration.
* @param $force optional. true, if the re-read should be forced. defaults
* to false.
* @return null
*/
private function readConfiguration($force = false) {
if((!$this->configured || $force) && !is_null($this->configID)) {
$this->configuration->readConfiguration();
$this->configured = $this->validateConfiguration();
}
}
/**
* @brief set LDAP configuration with values delivered by an array, not read from configuration
* @param $config array that holds the config parameters in an associated array
* @param &$setParameters optional; array where the set fields will be given to
* @return true if config validates, false otherwise. Check with $setParameters for detailed success on single parameters
*/
public function setConfiguration($config, &$setParameters = null) {
if(is_null($setParameters)) {
$setParameters = array();
}
$this->doNotValidate = false;
$this->configuration->setConfiguration($config, $setParameters);
if(count($setParameters) > 0) {
$this->configured = $this->validateConfiguration();
}
return $this->configured;
}
/**
* @brief saves the current Configuration in the database and empties the
* cache
* @return null
*/
public function saveConfiguration() {
$this->configuration->saveConfiguration();
$this->clearCache();
}
/**
* @brief get the current LDAP configuration
* @return array
*/
public function getConfiguration() {
$this->readConfiguration();
$config = $this->configuration->getConfiguration();
$cta = $this->configuration->getConfigTranslationArray();
$result = array();
foreach($cta as $dbkey => $configkey) {
switch($configkey) {
case 'homeFolderNamingRule':
if(strpos($config[$configkey], 'attr:') === 0) {
$result[$dbkey] = substr($config[$configkey], 5);
} else {
$result[$dbkey] = '';
}
break;
case 'ldapBase':
case 'ldapBaseUsers':
case 'ldapBaseGroups':
case 'ldapAttributesForUserSearch':
case 'ldapAttributesForGroupSearch':
if(is_array($config[$configkey])) {
$result[$dbkey] = implode("\n", $config[$configkey]);
break;
} //else follows default
default:
$result[$dbkey] = $config[$configkey];
}
}
return $result;
}
private function doSoftValidation() {
//if User or Group Base are not set, take over Base DN setting
foreach(array('ldapBaseUsers', 'ldapBaseGroups') as $keyBase) {
$val = $this->configuration->$keyBase;
if(empty($val)) {
$obj = strpos('Users', $keyBase) !== false ? 'Users' : 'Groups';
\OCP\Util::writeLog('user_ldap',
'Base tree for '.$obj.
' is empty, using Base DN',
\OCP\Util::INFO);
$this->configuration->$keyBase = $this->configuration->ldapBase;
}
}
$groupFilter = $this->configuration->ldapGroupFilter;
if(empty($groupFilter)) {
\OCP\Util::writeLog('user_ldap',
'No group filter is specified, LDAP group '.
'feature will not be used.',
\OCP\Util::INFO);
}
foreach(array('ldapExpertUUIDUserAttr' => 'ldapUuidUserAttribute',
'ldapExpertUUIDGroupAttr' => 'ldapUuidGroupAttribute')
as $expertSetting => $effectiveSetting) {
$uuidOverride = $this->configuration->$expertSetting;
if(!empty($uuidOverride)) {
$this->configuration->$effectiveSetting = $uuidOverride;
} else {
$uuidAttributes = array('auto', 'entryuuid', 'nsuniqueid',
'objectguid', 'guid');
if(!in_array($this->configuration->$effectiveSetting,
$uuidAttributes)
&& (!is_null($this->configID))) {
$this->configuration->$effectiveSetting = 'auto';
$this->configuration->saveConfiguration();
\OCP\Util::writeLog('user_ldap',
'Illegal value for the '.
$effectiveSetting.', '.'reset to '.
'autodetect.', \OCP\Util::INFO);
}
}
}
$backupPort = $this->configuration->ldapBackupPort;
if(empty($backupPort)) {
$this->configuration->backupPort = $this->configuration->ldapPort;
}
//make sure empty search attributes are saved as simple, empty array
$sakeys = array('ldapAttributesForUserSearch',
'ldapAttributesForGroupSearch');
foreach($sakeys as $key) {
$val = $this->configuration->$key;
if(is_array($val) && count($val) === 1 && empty($val[0])) {
$this->configuration->$key = array();
}
}
if((stripos($this->configuration->ldapHost, 'ldaps://') === 0)
&& $this->configuration->ldapTLS) {
$this->configuration->ldapTLS = false;
\OCP\Util::writeLog('user_ldap',
'LDAPS (already using secure connection) and '.
'TLS do not work together. Switched off TLS.',
\OCP\Util::INFO);
}
}
private function doCriticalValidation() {
$configurationOK = true;
$errorStr = 'Configuration Error (prefix '.
strval($this->configPrefix).'): ';
//options that shall not be empty
$options = array('ldapHost', 'ldapPort', 'ldapUserDisplayName',
'ldapGroupDisplayName', 'ldapLoginFilter');
foreach($options as $key) {
$val = $this->configuration->$key;
if(empty($val)) {
switch($key) {
case 'ldapHost':
$subj = 'LDAP Host';
break;
case 'ldapPort':
$subj = 'LDAP Port';
break;
case 'ldapUserDisplayName':
$subj = 'LDAP User Display Name';
break;
case 'ldapGroupDisplayName':
$subj = 'LDAP Group Display Name';
break;
case 'ldapLoginFilter':
$subj = 'LDAP Login Filter';
break;
default:
$subj = $key;
break;
}
$configurationOK = false;
\OCP\Util::writeLog('user_ldap',
$errorStr.'No '.$subj.' given!',
\OCP\Util::WARN);
}
}
//combinations
$agent = $this->configuration->ldapAgentName;
$pwd = $this->configuration->ldapAgentPassword;
if((empty($agent) && !empty($pwd)) || (!empty($agent) && empty($pwd))) {
\OCP\Util::writeLog('user_ldap',
$errorStr.'either no password is given for the'.
'user agent or a password is given, but not an'.
'LDAP agent.',
\OCP\Util::WARN);
$configurationOK = false;
}
$base = $this->configuration->ldapBase;
$baseUsers = $this->configuration->ldapBaseUsers;
$baseGroups = $this->configuration->ldapBaseGroups;
if(empty($base) && empty($baseUsers) && empty($baseGroups)) {
\OCP\Util::writeLog('user_ldap',
$errorStr.'Not a single Base DN given.',
\OCP\Util::WARN);
$configurationOK = false;
}
if(mb_strpos($this->configuration->ldapLoginFilter, '%uid', 0, 'UTF-8')
=== false) {
\OCP\Util::writeLog('user_ldap',
$errorStr.'login filter does not contain %uid '.
'place holder.',
\OCP\Util::WARN);
$configurationOK = false;
}
return $configurationOK;
}
/**
* @brief Validates the user specified configuration
* @returns true if configuration seems OK, false otherwise
*/
private function validateConfiguration() {
if($this->doNotValidate) {
//don't do a validation if it is a new configuration with pure
//default values. Will be allowed on changes via __set or
//setConfiguration
return false;
}
// first step: "soft" checks: settings that are not really
// necessary, but advisable. If left empty, give an info message
$this->doSoftValidation();
//second step: critical checks. If left empty or filled wrong, set as
//unconfigured and give a warning.
return $this->doCriticalValidation();
}
/**
* Connects and Binds to LDAP
*/
private function establishConnection() {
if(!$this->configuration->ldapConfigurationActive) {
return null;
}
static $phpLDAPinstalled = true;
if(!$phpLDAPinstalled) {
return false;
}
if(!$this->configured) {
\OCP\Util::writeLog('user_ldap',
'Configuration is invalid, cannot connect',
\OCP\Util::WARN);
return false;
}
if(!$this->ldapConnectionRes) {
if(!$this->ldap->areLDAPFunctionsAvailable()) {
$phpLDAPinstalled = false;
\OCP\Util::writeLog('user_ldap',
'function ldap_connect is not available. Make '.
'sure that the PHP ldap module is installed.',
\OCP\Util::ERROR);
return false;
}
if($this->configuration->turnOffCertCheck) {
if(putenv('LDAPTLS_REQCERT=never')) {
\OCP\Util::writeLog('user_ldap',
'Turned off SSL certificate validation successfully.',
\OCP\Util::WARN);
} else {
\OCP\Util::writeLog('user_ldap',
'Could not turn off SSL certificate validation.',
\OCP\Util::WARN);
}
}
if(!$this->configuration->ldapOverrideMainServer
&& !$this->getFromCache('overrideMainServer')) {
$this->doConnect($this->configuration->ldapHost,
$this->configuration->ldapPort);
$bindStatus = $this->bind();
$error = $this->ldap->isResource($this->ldapConnectionRes) ?
$this->ldap->errno($this->ldapConnectionRes) : -1;
} else {
$bindStatus = false;
$error = null;
}
//if LDAP server is not reachable, try the Backup (Replica!) Server
if((!$bindStatus && ($error !== 0))
|| $this->configuration->ldapOverrideMainServer
|| $this->getFromCache('overrideMainServer')) {
$this->doConnect($this->configuration->ldapBackupHost,
$this->configuration->ldapBackupPort);
$bindStatus = $this->bind();
if(!$bindStatus && $error === -1) {
//when bind to backup server succeeded and failed to main server,
//skip contacting him until next cache refresh
$this->writeToCache('overrideMainServer', true);
}
}
return $bindStatus;
}
}
private function doConnect($host, $port) {
if(empty($host)) {
return false;
}
if(strpos($host, '://') !== false) {
//ldap_connect ignores port paramater when URLs are passed
$host .= ':' . $port;
}
$this->ldapConnectionRes = $this->ldap->connect($host, $port);
if($this->ldap->setOption($this->ldapConnectionRes, LDAP_OPT_PROTOCOL_VERSION, 3)) {
if($this->ldap->setOption($this->ldapConnectionRes, LDAP_OPT_REFERRALS, 0)) {
if($this->configuration->ldapTLS) {
$this->ldap->startTls($this->ldapConnectionRes);
}
}
}
}
/**
* Binds to LDAP
*/
public function bind() {
static $getConnectionResourceAttempt = false;
if(!$this->configuration->ldapConfigurationActive) {
return false;
}
if($getConnectionResourceAttempt) {
$getConnectionResourceAttempt = false;
return false;
}
$getConnectionResourceAttempt = true;
$cr = $this->getConnectionResource();
$getConnectionResourceAttempt = false;
if(!$this->ldap->isResource($cr)) {
return false;
}
$ldapLogin = @$this->ldap->bind($cr,
$this->configuration->ldapAgentName,
$this->configuration->ldapAgentPassword);
if(!$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;
}
}