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<?php
/**
* @copyright Copyright (c) 2016, ownCloud, Inc.
*
* @author Arthur Schiwon <blizzz@arthur-schiwon.de>
* @author Bart Visscher <bartv@thisnet.nl>
* @author Dominik Schmidt <dev@dominik-schmidt.de>
* @author felixboehm <felix@webhippie.de>
* @author Joas Schilling <coding@schilljs.com>
* @author Jörn Friedrich Dreyer <jfd@butonic.de>
* @author Lukas Reschke <lukas@statuscode.ch>
* @author Morris Jobke <hey@morrisjobke.de>
* @author Renaud Fortier <Renaud.Fortier@fsaa.ulaval.ca>
* @author Robin Appelman <robin@icewind.nl>
* @author Robin McCorkell <robin@mccorkell.me.uk>
* @author Roger Szabo <roger.szabo@web.de>
* @author root <root@localhost.localdomain>
* @author Thomas Müller <thomas.mueller@tmit.eu>
* @author Tom Needham <tom@owncloud.com>
* @author Victor Dubiniuk <dubiniuk@owncloud.com>
* @author Vinicius Cubas Brand <vinicius@eita.org.br>
*
* @license AGPL-3.0
*
* This code is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program 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, version 3,
* along with this program. If not, see <http://www.gnu.org/licenses/>
*
*/
namespace OCA\User_LDAP;
use OC\ServerNotAvailableException;
use OC\User\Backend;
use OC\User\NoUserException;
use OCA\User_LDAP\Exceptions\NotOnLDAP;
use OCA\User_LDAP\User\OfflineUser;
use OCA\User_LDAP\User\User;
use OCP\IConfig;
use OCP\IUser;
use OCP\IUserSession;
use OCP\Notification\IManager as INotificationManager;
use OCP\Util;
class User_LDAP extends BackendUtility implements \OCP\IUserBackend, \OCP\UserInterface, IUserLDAP {
/** @var \OCP\IConfig */
protected $ocConfig;
/** @var INotificationManager */
protected $notificationManager;
/** @var string */
protected $currentUserInDeletionProcess;
/** @var UserPluginManager */
protected $userPluginManager;
/**
* @param Access $access
* @param \OCP\IConfig $ocConfig
* @param \OCP\Notification\IManager $notificationManager
* @param IUserSession $userSession
*/
public function __construct(Access $access, IConfig $ocConfig, INotificationManager $notificationManager, IUserSession $userSession, UserPluginManager $userPluginManager) {
parent::__construct($access);
$this->ocConfig = $ocConfig;
$this->notificationManager = $notificationManager;
$this->userPluginManager = $userPluginManager;
$this->registerHooks($userSession);
}
protected function registerHooks(IUserSession $userSession) {
$userSession->listen('\OC\User', 'preDelete', [$this, 'preDeleteUser']);
$userSession->listen('\OC\User', 'postDelete', [$this, 'postDeleteUser']);
}
public function preDeleteUser(IUser $user) {
$this->currentUserInDeletionProcess = $user->getUID();
}
public function postDeleteUser() {
$this->currentUserInDeletionProcess = null;
}
/**
* checks whether the user is allowed to change his avatar in Nextcloud
* @param string $uid the Nextcloud user name
* @return boolean either the user can or cannot
*/
public function canChangeAvatar($uid) {
if ($this->userPluginManager->implementsActions(Backend::PROVIDE_AVATAR)) {
return $this->userPluginManager->canChangeAvatar($uid);
}
$user = $this->access->userManager->get($uid);
if(!$user instanceof User) {
return false;
}
if($user->getAvatarImage() === false) {
return true;
}
return false;
}
/**
* returns the username for the given login name, if available
*
* @param string $loginName
* @return string|false
*/
public function loginName2UserName($loginName) {
$cacheKey = 'loginName2UserName-'.$loginName;
$username = $this->access->connection->getFromCache($cacheKey);
if(!is_null($username)) {
return $username;
}
try {
$ldapRecord = $this->getLDAPUserByLoginName($loginName);
$user = $this->access->userManager->get($ldapRecord['dn'][0]);
if($user instanceof OfflineUser) {
// this path is not really possible, however get() is documented
// to return User or OfflineUser so we are very defensive here.
$this->access->connection->writeToCache($cacheKey, false);
return false;
}
$username = $user->getUsername();
$this->access->connection->writeToCache($cacheKey, $username);
return $username;
} catch (NotOnLDAP $e) {
$this->access->connection->writeToCache($cacheKey, false);
return false;
}
}
/**
* returns the username for the given LDAP DN, if available
*
* @param string $dn
* @return string|false with the username
*/
public function dn2UserName($dn) {
return $this->access->dn2username($dn);
}
/**
* returns an LDAP record based on a given login name
*
* @param string $loginName
* @return array
* @throws NotOnLDAP
*/
public function getLDAPUserByLoginName($loginName) {
//find out dn of the user name
$attrs = $this->access->userManager->getAttributes();
$users = $this->access->fetchUsersByLoginName($loginName, $attrs);
if(count($users) < 1) {
throw new NotOnLDAP('No user available for the given login name on ' .
$this->access->connection->ldapHost . ':' . $this->access->connection->ldapPort);
}
return $users[0];
}
/**
* Check if the password is correct without logging in the user
*
* @param string $uid The username
* @param string $password The password
* @return false|string
*/
public function checkPassword($uid, $password) {
try {
$ldapRecord = $this->getLDAPUserByLoginName($uid);
} catch(NotOnLDAP $e) {
if($this->ocConfig->getSystemValue('loglevel', Util::WARN) === Util::DEBUG) {
\OC::$server->getLogger()->logException($e, ['app' => 'user_ldap']);
}
return false;
}
$dn = $ldapRecord['dn'][0];
$user = $this->access->userManager->get($dn);
if(!$user instanceof User) {
Util::writeLog('user_ldap',
'LDAP Login: Could not get user object for DN ' . $dn .
'. Maybe the LDAP entry has no set display name attribute?',
Util::WARN);
return false;
}
if($user->getUsername() !== false) {
//are the credentials OK?
if(!$this->access->areCredentialsValid($dn, $password)) {
return false;
}
$this->access->cacheUserExists($user->getUsername());
$user->processAttributes($ldapRecord);
$user->markLogin();
return $user->getUsername();
}
return false;
}
/**
* Set password
* @param string $uid The username
* @param string $password The new password
* @return bool
*/
public function setPassword($uid, $password) {
if ($this->userPluginManager->implementsActions(Backend::SET_PASSWORD)) {
return $this->userPluginManager->setPassword($uid, $password);
}
$user = $this->access->userManager->get($uid);
if(!$user instanceof User) {
throw new \Exception('LDAP setPassword: Could not get user object for uid ' . $uid .
'. Maybe the LDAP entry has no set display name attribute?');
}
if($user->getUsername() !== false && $this->access->setPassword($user->getDN(), $password)) {
$ldapDefaultPPolicyDN = $this->access->connection->ldapDefaultPPolicyDN;
$turnOnPasswordChange = $this->access->connection->turnOnPasswordChange;
if (!empty($ldapDefaultPPolicyDN) && (intval($turnOnPasswordChange) === 1)) {
//remove last password expiry warning if any
$notification = $this->notificationManager->createNotification();
$notification->setApp('user_ldap')
->setUser($uid)
->setObject('pwd_exp_warn', $uid)
;
$this->notificationManager->markProcessed($notification);
}
return true;
}
return false;
}
/**
* Get a list of all users
*
* @param string $search
* @param integer $limit
* @param integer $offset
* @return string[] an array of all uids
*/
public function getUsers($search = '', $limit = 10, $offset = 0) {
$search = $this->access->escapeFilterPart($search, true);
$cachekey = 'getUsers-'.$search.'-'.$limit.'-'.$offset;
//check if users are cached, if so return
$ldap_users = $this->access->connection->getFromCache($cachekey);
if(!is_null($ldap_users)) {
return $ldap_users;
}
// if we'd pass -1 to LDAP search, we'd end up in a Protocol
// error. With a limit of 0, we get 0 results. So we pass null.
if($limit <= 0) {
$limit = null;
}
$filter = $this->access->combineFilterWithAnd(array(
$this->access->connection->ldapUserFilter,
$this->access->connection->ldapUserDisplayName . '=*',
$this->access->getFilterPartForUserSearch($search)
));
Util::writeLog('user_ldap',
'getUsers: Options: search '.$search.' limit '.$limit.' offset '.$offset.' Filter: '.$filter,
Util::DEBUG);
//do the search and translate results to Nextcloud names
$ldap_users = $this->access->fetchListOfUsers(
$filter,
$this->access->userManager->getAttributes(true),
$limit, $offset);
$ldap_users = $this->access->nextcloudUserNames($ldap_users);
Util::writeLog('user_ldap', 'getUsers: '.count($ldap_users). ' Users found', Util::DEBUG);
$this->access->connection->writeToCache($cachekey, $ldap_users);
return $ldap_users;
}
/**
* checks whether a user is still available on LDAP
*
* @param string|\OCA\User_LDAP\User\User $user either the Nextcloud user
* name or an instance of that user
* @return bool
* @throws \Exception
* @throws \OC\ServerNotAvailableException
*/
public function userExistsOnLDAP($user) {
if(is_string($user)) {
$user = $this->access->userManager->get($user);
}
if(is_null($user)) {
return false;
}
$dn = $user->getDN();
//check if user really still exists by reading its entry
if(!is_array($this->access->readAttribute($dn, '', $this->access->connection->ldapUserFilter))) {
$lcr = $this->access->connection->getConnectionResource();
if(is_null($lcr)) {
throw new \Exception('No LDAP Connection to server ' . $this->access->connection->ldapHost);
}
try {
$uuid = $this->access->getUserMapper()->getUUIDByDN($dn);
if (!$uuid) {
return false;
}
$newDn = $this->access->getUserDnByUuid($uuid);
//check if renamed user is still valid by reapplying the ldap filter
if (!is_array($this->access->readAttribute($newDn, '', $this->access->connection->ldapUserFilter))) {
return false;
}
$this->access->getUserMapper()->setDNbyUUID($newDn, $uuid);
return true;
} catch (ServerNotAvailableException $e) {
throw $e;
} catch (\Exception $e) {
return false;
}
}
if($user instanceof OfflineUser) {
$user->unmark();
}
return true;
}
/**
* check if a user exists
* @param string $uid the username
* @return boolean
* @throws \Exception when connection could not be established
*/
public function userExists($uid) {
$userExists = $this->access->connection->getFromCache('userExists'.$uid);
if(!is_null($userExists)) {
return (bool)$userExists;
}
//getting dn, if false the user does not exist. If dn, he may be mapped only, requires more checking.
$user = $this->access->userManager->get($uid);
if(is_null($user)) {
Util::writeLog('user_ldap', 'No DN found for '.$uid.' on '.
$this->access->connection->ldapHost, Util::DEBUG);
$this->access->connection->writeToCache('userExists'.$uid, false);
return false;
} else if($user instanceof OfflineUser) {
//express check for users marked as deleted. Returning true is
//necessary for cleanup
return true;
}
$result = $this->userExistsOnLDAP($user);
$this->access->connection->writeToCache('userExists'.$uid, $result);
if($result === true) {
$user->update();
}
return $result;
}
/**
* returns whether a user was deleted in LDAP
*
* @param string $uid The username of the user to delete
* @return bool
*/
public function deleteUser($uid) {
if ($this->userPluginManager->canDeleteUser()) {
return $this->userPluginManager->deleteUser($uid);
}
$marked = $this->ocConfig->getUserValue($uid, 'user_ldap', 'isDeleted', 0);
if(intval($marked) === 0) {
\OC::$server->getLogger()->notice(
'User '.$uid . ' is not marked as deleted, not cleaning up.',
array('app' => 'user_ldap'));
return false;
}
\OC::$server->getLogger()->info('Cleaning up after user ' . $uid,
array('app' => 'user_ldap'));
$this->access->getUserMapper()->unmap($uid);
$this->access->userManager->invalidate($uid);
return true;
}
/**
* get the user's home directory
*
* @param string $uid the username
* @return bool|string
* @throws NoUserException
* @throws \Exception
*/
public function getHome($uid) {
// user Exists check required as it is not done in user proxy!
if(!$this->userExists($uid)) {
return false;
}
if ($this->userPluginManager->implementsActions(Backend::GET_HOME)) {
return $this->userPluginManager->getHome($uid);
}
$cacheKey = 'getHome'.$uid;
$path = $this->access->connection->getFromCache($cacheKey);
if(!is_null($path)) {
return $path;
}
// early return path if it is a deleted user
$user = $this->access->userManager->get($uid);
if($user instanceof OfflineUser) {
if($this->currentUserInDeletionProcess !== null
&& $this->currentUserInDeletionProcess === $user->getOCName()
) {
return $user->getHomePath();
} else {
throw new NoUserException($uid . ' is not a valid user anymore');
}
} else if ($user === null) {
throw new NoUserException($uid . ' is not a valid user anymore');
}
$path = $user->getHomePath();
$this->access->cacheUserHome($uid, $path);
return $path;
}
/**
* get display name of the user
* @param string $uid user ID of the user
* @return string|false display name
*/
public function getDisplayName($uid) {
if ($this->userPluginManager->implementsActions(Backend::GET_DISPLAYNAME)) {
return $this->userPluginManager->getDisplayName($uid);
}
if(!$this->userExists($uid)) {
return false;
}
$cacheKey = 'getDisplayName'.$uid;
if(!is_null($displayName = $this->access->connection->getFromCache($cacheKey))) {
return $displayName;
}
//Check whether the display name is configured to have a 2nd feature
$additionalAttribute = $this->access->connection->ldapUserDisplayName2;
$displayName2 = '';
if ($additionalAttribute !== '') {
$displayName2 = $this->access->readAttribute(
$this->access->username2dn($uid),
$additionalAttribute);
}
$displayName = $this->access->readAttribute(
$this->access->username2dn($uid),
$this->access->connection->ldapUserDisplayName);
if($displayName && (count($displayName) > 0)) {
$displayName = $displayName[0];
if (is_array($displayName2)){
$displayName2 = count($displayName2) > 0 ? $displayName2[0] : '';
}
$user = $this->access->userManager->get($uid);
if ($user instanceof User) {
$displayName = $user->composeAndStoreDisplayName($displayName, $displayName2);
$this->access->connection->writeToCache($cacheKey, $displayName);
}
if ($user instanceof OfflineUser) {
/** @var OfflineUser $user*/
$displayName = $user->getDisplayName();
}
return $displayName;
}
return null;
}
/**
* set display name of the user
* @param string $uid user ID of the user
* @param string $displayName new display name of the user
* @return string|false display name
*/
public function setDisplayName($uid, $displayName) {
if ($this->userPluginManager->implementsActions(Backend::SET_DISPLAYNAME)) {
return $this->userPluginManager->setDisplayName($uid, $displayName);
}
return false;
}
/**
* Get a list of all display names
*
* @param string $search
* @param string|null $limit
* @param string|null $offset
* @return array an array of all displayNames (value) and the corresponding uids (key)
*/
public function getDisplayNames($search = '', $limit = null, $offset = null) {
$cacheKey = 'getDisplayNames-'.$search.'-'.$limit.'-'.$offset;
if(!is_null($displayNames = $this->access->connection->getFromCache($cacheKey))) {
return $displayNames;
}
$displayNames = array();
$users = $this->getUsers($search, $limit, $offset);
foreach ($users as $user) {
$displayNames[$user] = $this->getDisplayName($user);
}
$this->access->connection->writeToCache($cacheKey, $displayNames);
return $displayNames;
}
/**
* Check if backend implements actions
* @param int $actions bitwise-or'ed actions
* @return boolean
*
* Returns the supported actions as int to be
* compared with \OC\User\Backend::CREATE_USER etc.
*/
public function implementsActions($actions) {
return (bool)((Backend::CHECK_PASSWORD
| Backend::GET_HOME
| Backend::GET_DISPLAYNAME
| Backend::PROVIDE_AVATAR
| Backend::COUNT_USERS
| ((intval($this->access->connection->turnOnPasswordChange) === 1)?(Backend::SET_PASSWORD):0)
| $this->userPluginManager->getImplementedActions())
& $actions);
}
/**
* @return bool
*/
public function hasUserListings() {
return true;
}
/**
* counts the users in LDAP
*
* @return int|bool
*/
public function countUsers() {
if ($this->userPluginManager->implementsActions(Backend::COUNT_USERS)) {
return $this->userPluginManager->countUsers();
}
$filter = $this->access->getFilterForUserCount();
$cacheKey = 'countUsers-'.$filter;
if(!is_null($entries = $this->access->connection->getFromCache($cacheKey))) {
return $entries;
}
$entries = $this->access->countUsers($filter);
$this->access->connection->writeToCache($cacheKey, $entries);
return $entries;
}
/**
* Backend name to be shown in user management
* @return string the name of the backend to be shown
*/
public function getBackendName(){
return 'LDAP';
}
/**
* Return access for LDAP interaction.
* @param string $uid
* @return Access instance of Access for LDAP interaction
*/
public function getLDAPAccess($uid) {
return $this->access;
}
/**
* Return LDAP connection resource from a cloned connection.
* The cloned connection needs to be closed manually.
* of the current access.
* @param string $uid
* @return resource of the LDAP connection
*/
public function getNewLDAPConnection($uid) {
$connection = clone $this->access->getConnection();
return $connection->getConnectionResource();
}
/**
* create new user
* @param string $username username of the new user
* @param string $password password of the new user
* @return bool was the user created?
*/
public function createUser($username, $password) {
if ($this->userPluginManager->implementsActions(Backend::CREATE_USER)) {
return $this->userPluginManager->createUser($username, $password);
}
return false;
}
}