nextcloud/apps/user_ldap/lib/connection.php

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<?php
/**
* ownCloud LDAP Access
*
* @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 {
private $ldapConnectionRes = null;
private $configPrefix;
private $configID;
private $configured = false;
//whether connection should be kept on __destruct
private $dontDestruct = false;
//cache handler
protected $cache;
//settings
protected $config = array(
'ldapHost' => null,
'ldapPort' => null,
'ldapBackupHost' => null,
'ldapBackupPort' => null,
'ldapBase' => null,
'ldapBaseUsers' => null,
'ldapBaseGroups' => null,
'ldapAgentName' => null,
'ldapAgentPassword' => null,
'ldapTLS' => null,
'ldapNoCase' => null,
'turnOffCertCheck' => null,
'ldapIgnoreNamingRules' => null,
'ldapUserDisplayName' => null,
'ldapUserFilter' => null,
'ldapGroupFilter' => null,
'ldapGroupDisplayName' => null,
'ldapGroupMemberAssocAttr' => null,
'ldapLoginFilter' => null,
'ldapQuotaAttribute' => null,
'ldapQuotaDefault' => null,
'ldapEmailAttribute' => null,
'ldapCacheTTL' => null,
'ldapUuidAttribute' => null,
'ldapOverrideUuidAttribute' => null,
'ldapOverrideMainServer' => false,
'ldapConfigurationActive' => false,
'ldapAttributesForUserSearch' => null,
'ldapAttributesForGroupSearch' => null,
'homeFolderNamingRule' => null,
'hasPagedResultSupport' => false,
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'ldapExpertUsernameAttr' => null,
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'ldapExpertUUIDAttr' => null,
);
/**
* @brief Constructor
* @param $configPrefix a string with the prefix for the configkey column (appconfig table)
* @param $configID a string with the value for the appid column (appconfig table) or null for on-the-fly connections
*/
public function __construct($configPrefix = '', $configID = 'user_ldap') {
$this->configPrefix = $configPrefix;
$this->configID = $configID;
$this->cache = \OC_Cache::getGlobalCache();
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$this->config['hasPagedResultSupport'] = (function_exists('ldap_control_paged_result')
&& function_exists('ldap_control_paged_result_response'));
}
public function __destruct() {
if(!$this->dontDestruct && is_resource($this->ldapConnectionRes)) {
@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) {
$this->readConfiguration();
}
if(isset($this->config[$name])) {
return $this->config[$name];
}
}
public function __set($name, $value) {
$changed = false;
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//only few options are writable
if($name === 'ldapUuidAttribute') {
\OCP\Util::writeLog('user_ldap', 'Set config ldapUuidAttribute to '.$value, \OCP\Util::DEBUG);
$this->config[$name] = $value;
if(!empty($this->configID)) {
\OCP\Config::setAppValue($this->configID, $this->configPrefix.'ldap_uuid_attribute', $value);
}
$changed = true;
}
if($changed) {
$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) {
$this->init();
} else if(!is_resource($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->config['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->config['ldapCacheTTL']) {
return false;
}
$key = $this->getCacheKey($key);
return $this->cache->hasKey($key);
}
public function writeToCache($key, $value) {
if(!$this->configured) {
$this->readConfiguration();
}
if(!$this->config['ldapCacheTTL']
|| !$this->config['ldapConfigurationActive']) {
return null;
}
$key = $this->getCacheKey($key);
$value = base64_encode(serialize($value));
$this->cache->set($key, $value, $this->config['ldapCacheTTL']);
}
public function clearCache() {
$this->cache->clear($this->getCacheKey(null));
}
private function getValue($varname) {
static $defaults;
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if(is_null($defaults)) {
$defaults = $this->getDefaults();
}
return \OCP\Config::getAppValue($this->configID,
$this->configPrefix.$varname,
$defaults[$varname]);
}
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private function setValue($varname, $value) {
\OCP\Config::setAppValue($this->configID,
$this->configPrefix.$varname,
$value);
}
/**
* Special handling for reading Base Configuration
*
* @param $base the internal name of the config key
* @param $value the value stored for the base
*/
private function readBase($base, $value) {
if(empty($value)) {
$value = '';
} else {
$value = preg_split('/\r\n|\r|\n/', $value);
}
$this->config[$base] = $value;
}
/**
* Caches the general LDAP configuration.
*/
private function readConfiguration($force = false) {
if((!$this->configured || $force) && !is_null($this->configID)) {
$v = 'getValue';
$this->config['ldapHost'] = $this->$v('ldap_host');
$this->config['ldapBackupHost'] = $this->$v('ldap_backup_host');
$this->config['ldapPort'] = $this->$v('ldap_port');
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$this->config['ldapBackupPort'] = $this->$v('ldap_backup_port');
$this->config['ldapOverrideMainServer']
= $this->$v('ldap_override_main_server');
$this->config['ldapAgentName'] = $this->$v('ldap_dn');
$this->config['ldapAgentPassword']
= base64_decode($this->$v('ldap_agent_password'));
$this->readBase('ldapBase', $this->$v('ldap_base'));
$this->readBase('ldapBaseUsers', $this->$v('ldap_base_users'));
$this->readBase('ldapBaseGroups', $this->$v('ldap_base_groups'));
$this->config['ldapTLS'] = $this->$v('ldap_tls');
$this->config['ldapNoCase'] = $this->$v('ldap_nocase');
$this->config['turnOffCertCheck']
= $this->$v('ldap_turn_off_cert_check');
$this->config['ldapUserDisplayName']
= mb_strtolower($this->$v('ldap_display_name'), 'UTF-8');
$this->config['ldapUserFilter']
= $this->$v('ldap_userlist_filter');
$this->config['ldapGroupFilter'] = $this->$v('ldap_group_filter');
$this->config['ldapLoginFilter'] = $this->$v('ldap_login_filter');
$this->config['ldapGroupDisplayName']
= mb_strtolower($this->$v('ldap_group_display_name'), 'UTF-8');
$this->config['ldapQuotaAttribute']
= $this->$v('ldap_quota_attr');
$this->config['ldapQuotaDefault']
= $this->$v('ldap_quota_def');
$this->config['ldapEmailAttribute']
= $this->$v('ldap_email_attr');
$this->config['ldapGroupMemberAssocAttr']
= $this->$v('ldap_group_member_assoc_attribute');
$this->config['ldapIgnoreNamingRules']
= \OCP\Config::getSystemValue('ldapIgnoreNamingRules', false);
$this->config['ldapCacheTTL'] = $this->$v('ldap_cache_ttl');
$this->config['ldapUuidAttribute']
= $this->$v('ldap_uuid_attribute');
$this->config['ldapOverrideUuidAttribute']
= $this->$v('ldap_override_uuid_attribute');
$this->config['homeFolderNamingRule']
= $this->$v('home_folder_naming_rule');
$this->config['ldapConfigurationActive']
= $this->$v('ldap_configuration_active');
$this->config['ldapAttributesForUserSearch']
= preg_split('/\r\n|\r|\n/', $this->$v('ldap_attributes_for_user_search'));
$this->config['ldapAttributesForGroupSearch']
= preg_split('/\r\n|\r|\n/', $this->$v('ldap_attributes_for_group_search'));
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$this->config['ldapExpertUsernameAttr']
= $this->$v('ldap_expert_username_attr');
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$this->config['ldapExpertUUIDAttr']
= $this->$v('ldap_expert_uuid_attr');
$this->configured = $this->validateConfiguration();
}
}
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/**
* @return returns an array that maps internal variable names to database fields
*/
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private function getConfigTranslationArray() {
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static $array = array(
'ldap_host'=>'ldapHost',
'ldap_port'=>'ldapPort',
'ldap_backup_host'=>'ldapBackupHost',
'ldap_backup_port'=>'ldapBackupPort',
'ldap_override_main_server' => 'ldapOverrideMainServer',
'ldap_dn'=>'ldapAgentName',
'ldap_agent_password'=>'ldapAgentPassword',
'ldap_base'=>'ldapBase',
'ldap_base_users'=>'ldapBaseUsers',
'ldap_base_groups'=>'ldapBaseGroups',
'ldap_userlist_filter'=>'ldapUserFilter',
'ldap_login_filter'=>'ldapLoginFilter',
'ldap_group_filter'=>'ldapGroupFilter',
'ldap_display_name'=>'ldapUserDisplayName',
'ldap_group_display_name'=>'ldapGroupDisplayName',
'ldap_tls'=>'ldapTLS',
'ldap_nocase'=>'ldapNoCase',
'ldap_quota_def'=>'ldapQuotaDefault',
'ldap_quota_attr'=>'ldapQuotaAttribute',
'ldap_email_attr'=>'ldapEmailAttribute',
'ldap_group_member_assoc_attribute'=>'ldapGroupMemberAssocAttr',
'ldap_cache_ttl'=>'ldapCacheTTL',
'home_folder_naming_rule' => 'homeFolderNamingRule',
'ldap_turn_off_cert_check' => 'turnOffCertCheck',
'ldap_configuration_active' => 'ldapConfigurationActive',
'ldap_attributes_for_user_search' => 'ldapAttributesForUserSearch',
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'ldap_attributes_for_group_search' => 'ldapAttributesForGroupSearch',
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'ldap_expert_username_attr' => 'ldapExpertUsernameAttr',
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'ldap_expert_uuid_attr' => 'ldapExpertUUIDAttr',
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);
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return $array;
}
/**
* @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, &$setParameters = null) {
if(!is_array($config)) {
return false;
}
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$params = $this->getConfigTranslationArray();
foreach($config as $parameter => $value) {
if(($parameter === 'homeFolderNamingRule'
|| (isset($params[$parameter])
&& $params[$parameter] === 'homeFolderNamingRule'))
&& !empty($value)) {
$value = 'attr:'.$value;
}
if(isset($this->config[$parameter])) {
$this->config[$parameter] = $value;
if(is_array($setParameters)) {
$setParameters[] = $parameter;
}
} else if(isset($params[$parameter])) {
$this->config[$params[$parameter]] = $value;
if(is_array($setParameters)) {
$setParameters[] = $params[$parameter];
}
}
}
$this->configured = $this->validateConfiguration();
return $this->configured;
}
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/**
* @brief saves the current Configuration in the database
*/
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public function saveConfiguration() {
$trans = array_flip($this->getConfigTranslationArray());
foreach($this->config as $key => $value) {
\OCP\Util::writeLog('user_ldap', 'LDAP: storing key '.$key.' value '.$value, \OCP\Util::DEBUG);
switch ($key) {
case 'ldapAgentPassword':
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$value = base64_encode($value);
break;
case 'ldapBase':
case 'ldapBaseUsers':
case 'ldapBaseGroups':
case 'ldapAttributesForUserSearch':
case 'ldapAttributesForGroupSearch':
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if(is_array($value)) {
$value = implode("\n", $value);
}
break;
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case 'ldapIgnoreNamingRules':
case 'ldapOverrideUuidAttribute':
case 'ldapUuidAttribute':
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case 'hasPagedResultSupport':
continue 2;
}
if(is_null($value)) {
$value = '';
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}
$this->setValue($trans[$key], $value);
}
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$this->clearCache();
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}
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/**
* @brief get the current LDAP configuration
* @return array
*/
public function getConfiguration() {
$this->readConfiguration();
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$trans = $this->getConfigTranslationArray();
$config = array();
foreach($trans as $dbKey => $classKey) {
if($classKey === 'homeFolderNamingRule') {
if(strpos($this->config[$classKey], 'attr:') === 0) {
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$config[$dbKey] = substr($this->config[$classKey], 5);
} else {
$config[$dbKey] = '';
}
continue;
} else if((strpos($classKey, 'ldapBase') !== false)
|| (strpos($classKey, 'ldapAttributes') !== false)) {
$config[$dbKey] = implode("\n", $this->config[$classKey]);
continue;
}
$config[$dbKey] = $this->config[$classKey];
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}
return $config;
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}
/**
* @brief Validates the user specified configuration
* @returns true if configuration seems OK, false otherwise
*/
private function validateConfiguration() {
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// first step: "soft" checks: settings that are not really
// necessary, but advisable. If left empty, give an info message
if(empty($this->config['ldapBaseUsers'])) {
\OCP\Util::writeLog('user_ldap', 'Base tree for Users is empty, using Base DN', \OCP\Util::INFO);
$this->config['ldapBaseUsers'] = $this->config['ldapBase'];
}
if(empty($this->config['ldapBaseGroups'])) {
\OCP\Util::writeLog('user_ldap', 'Base tree for Groups is empty, using Base DN', \OCP\Util::INFO);
$this->config['ldapBaseGroups'] = $this->config['ldapBase'];
}
if(empty($this->config['ldapGroupFilter']) && empty($this->config['ldapGroupMemberAssocAttr'])) {
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\OCP\Util::writeLog('user_ldap',
'No group filter is specified, LDAP group feature will not be used.',
\OCP\Util::INFO);
}
$uuidAttributes = array(
'auto', 'entryuuid', 'nsuniqueid', 'objectguid', 'guid');
if(!in_array($this->config['ldapUuidAttribute'], $uuidAttributes)
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&& (!is_null($this->configID))) {
\OCP\Config::setAppValue($this->configID, $this->configPrefix.'ldap_uuid_attribute', 'auto');
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\OCP\Util::writeLog('user_ldap',
'Illegal value for the UUID Attribute, reset to autodetect.',
\OCP\Util::INFO);
}
if(empty($this->config['ldapBackupPort'])) {
//force default
$this->config['ldapBackupPort'] = $this->config['ldapPort'];
}
foreach(array('ldapAttributesForUserSearch', 'ldapAttributesForGroupSearch') as $key) {
if(is_array($this->config[$key])
&& count($this->config[$key]) === 1
&& empty($this->config[$key][0])) {
$this->config[$key] = array();
}
}
if((strpos($this->config['ldapHost'], 'ldaps') === 0)
&& $this->config['ldapTLS']) {
$this->config['ldapTLS'] = false;
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\OCP\Util::writeLog('user_ldap',
'LDAPS (already using secure connection) and TLS do not work together. Switched off TLS.',
\OCP\Util::INFO);
}
//second step: critical checks. If left empty or filled wrong, set as unconfigured and give a warning.
$configurationOK = true;
if(empty($this->config['ldapHost'])) {
\OCP\Util::writeLog('user_ldap', 'No LDAP host given, won`t connect.', \OCP\Util::WARN);
$configurationOK = false;
}
if(empty($this->config['ldapPort'])) {
\OCP\Util::writeLog('user_ldap', 'No LDAP Port given, won`t connect.', \OCP\Util::WARN);
$configurationOK = false;
}
if((empty($this->config['ldapAgentName']) && !empty($this->config['ldapAgentPassword']))
|| (!empty($this->config['ldapAgentName']) && empty($this->config['ldapAgentPassword']))) {
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\OCP\Util::writeLog('user_ldap',
'Either no password given for the user agent or a password is given, but no LDAP agent; won`t connect.',
\OCP\Util::WARN);
$configurationOK = false;
}
//TODO: check if ldapAgentName is in DN form
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if(empty($this->config['ldapBase'])
&& (empty($this->config['ldapBaseUsers'])
&& empty($this->config['ldapBaseGroups']))) {
\OCP\Util::writeLog('user_ldap', 'No Base DN given, won`t connect.', \OCP\Util::WARN);
$configurationOK = false;
}
if(empty($this->config['ldapUserDisplayName'])) {
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\OCP\Util::writeLog('user_ldap',
'No user display name attribute specified, won`t connect.',
\OCP\Util::WARN);
$configurationOK = false;
}
if(empty($this->config['ldapGroupDisplayName'])) {
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\OCP\Util::writeLog('user_ldap',
'No group display name attribute specified, won`t connect.',
\OCP\Util::WARN);
$configurationOK = false;
}
if(empty($this->config['ldapLoginFilter'])) {
\OCP\Util::writeLog('user_ldap', 'No login filter specified, won`t connect.', \OCP\Util::WARN);
$configurationOK = false;
}
if(mb_strpos($this->config['ldapLoginFilter'], '%uid', 0, 'UTF-8') === false) {
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\OCP\Util::writeLog('user_ldap',
'Login filter does not contain %uid place holder, won`t connect.',
\OCP\Util::WARN);
\OCP\Util::writeLog('user_ldap', 'Login filter was ' . $this->config['ldapLoginFilter'], \OCP\Util::DEBUG);
$configurationOK = false;
}
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if(!empty($this->config['ldapExpertUUIDAttr'])) {
$this->config['ldapUuidAttribute'] = $this->config['ldapExpertUUIDAttr'];
}
return $configurationOK;
}
/**
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* @returns an associative array with the default values. Keys are correspond
* to config-value entries in the database table
*/
public function getDefaults() {
return array(
'ldap_host' => '',
'ldap_port' => '389',
'ldap_backup_host' => '',
'ldap_backup_port' => '',
'ldap_override_main_server' => '',
'ldap_dn' => '',
'ldap_agent_password' => '',
'ldap_base' => '',
'ldap_base_users' => '',
'ldap_base_groups' => '',
'ldap_userlist_filter' => 'objectClass=person',
'ldap_login_filter' => 'uid=%uid',
'ldap_group_filter' => 'objectClass=posixGroup',
'ldap_display_name' => 'cn',
'ldap_group_display_name' => 'cn',
'ldap_tls' => 1,
'ldap_nocase' => 0,
'ldap_quota_def' => '',
'ldap_quota_attr' => '',
'ldap_email_attr' => '',
'ldap_group_member_assoc_attribute' => 'uniqueMember',
'ldap_cache_ttl' => 600,
'ldap_uuid_attribute' => 'auto',
'ldap_override_uuid_attribute' => 0,
'home_folder_naming_rule' => '',
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'ldap_turn_off_cert_check' => 0,
'ldap_configuration_active' => 1,
'ldap_attributes_for_user_search' => '',
'ldap_attributes_for_group_search' => '',
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'ldap_expert_username_attr' => '',
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'ldap_expert_uuid_attr' => '',
);
}
/**
* Connects and Binds to LDAP
*/
private function establishConnection() {
if(!$this->config['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(!function_exists('ldap_connect')) {
$phpLDAPinstalled = false;
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\OCP\Util::writeLog('user_ldap',
'function ldap_connect is not available. Make sure that the PHP ldap module is installed.',
\OCP\Util::ERROR);
return false;
}
if($this->config['turnOffCertCheck']) {
if(putenv('LDAPTLS_REQCERT=never')) {
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\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(!$this->config['ldapOverrideMainServer'] && !$this->getFromCache('overrideMainServer')) {
$this->doConnect($this->config['ldapHost'], $this->config['ldapPort']);
$bindStatus = $this->bind();
$error = is_resource($this->ldapConnectionRes) ? ldap_errno($this->ldapConnectionRes) : -1;
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} else {
$bindStatus = false;
$error = null;
}
//if LDAP server is not reachable, try the Backup (Replica!) Server
if((!$bindStatus && ($error !== 0))
|| $this->config['ldapOverrideMainServer']
|| $this->getFromCache('overrideMainServer')) {
$this->doConnect($this->config['ldapBackupHost'], $this->config['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;
}
$this->ldapConnectionRes = ldap_connect($host, $port);
if(ldap_set_option($this->ldapConnectionRes, LDAP_OPT_PROTOCOL_VERSION, 3)) {
if(ldap_set_option($this->ldapConnectionRes, LDAP_OPT_REFERRALS, 0)) {
if($this->config['ldapTLS']) {
ldap_start_tls($this->ldapConnectionRes);
}
}
}
}
/**
* Binds to LDAP
*/
public function bind() {
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static $getConnectionResourceAttempt = false;
if(!$this->config['ldapConfigurationActive']) {
return false;
}
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if($getConnectionResourceAttempt) {
$getConnectionResourceAttempt = false;
return false;
}
$getConnectionResourceAttempt = true;
$cr = $this->getConnectionResource();
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$getConnectionResourceAttempt = false;
if(!is_resource($cr)) {
return false;
}
$ldapLogin = @ldap_bind($cr, $this->config['ldapAgentName'], $this->config['ldapAgentPassword']);
if(!$ldapLogin) {
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\OCP\Util::writeLog('user_ldap',
'Bind failed: ' . ldap_errno($cr) . ': ' . ldap_error($cr),
\OCP\Util::ERROR);
$this->ldapConnectionRes = null;
return false;
}
return true;
}
}