nextcloud/apps/user_ldap/group_ldap.php

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<?php
/**
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* @author Alexander Bergolth <leo@strike.wu.ac.at>
* @author Andreas Fischer <bantu@owncloud.com>
* @author Arthur Schiwon <blizzz@owncloud.com>
* @author Bart Visscher <bartv@thisnet.nl>
* @author Christopher Schäpers <kondou@ts.unde.re>
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* @author Frédéric Fortier <frederic.fortier@oronospolytechnique.com>
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* @author Lukas Reschke <lukas@owncloud.com>
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* @author Morris Jobke <hey@morrisjobke.de>
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* @author Nicolas Grekas <nicolas.grekas@gmail.com>
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* @author Robin McCorkell <robin@mccorkell.me.uk>
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* @author Thomas Müller <thomas.mueller@tmit.eu>
* @author Vincent Petry <pvince81@owncloud.com>
*
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* @copyright Copyright (c) 2016, ownCloud, Inc.
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* @license AGPL-3.0
*
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* 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.
*
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* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
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* 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 OCA\user_ldap\lib\Access;
use OCA\user_ldap\lib\BackendUtility;
class GROUP_LDAP extends BackendUtility implements \OCP\GroupInterface {
protected $enabled = false;
/**
* @var string[] $cachedGroupMembers array of users with gid as key
*/
protected $cachedGroupMembers = array();
/**
* @var string[] $cachedGroupsByMember array of groups with uid as key
*/
protected $cachedGroupsByMember = array();
public function __construct(Access $access) {
parent::__construct($access);
$filter = $this->access->connection->ldapGroupFilter;
$gassoc = $this->access->connection->ldapGroupMemberAssocAttr;
if(!empty($filter) && !empty($gassoc)) {
$this->enabled = true;
}
}
/**
* is user in group?
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* @param string $uid uid of the user
* @param string $gid gid of the group
* @return bool
*
* Checks whether the user is member of a group or not.
*/
public function inGroup($uid, $gid) {
if(!$this->enabled) {
return false;
}
$cacheKey = 'inGroup'.$uid.':'.$gid;
if($this->access->connection->isCached($cacheKey)) {
return $this->access->connection->getFromCache($cacheKey);
}
$userDN = $this->access->username2dn($uid);
if(isset($this->cachedGroupMembers[$gid])) {
$isInGroup = in_array($userDN, $this->cachedGroupMembers[$gid]);
return $isInGroup;
}
$cacheKeyMembers = 'inGroup-members:'.$gid;
if($this->access->connection->isCached($cacheKeyMembers)) {
$members = $this->access->connection->getFromCache($cacheKeyMembers);
$this->cachedGroupMembers[$gid] = $members;
$isInGroup = in_array($userDN, $members);
$this->access->connection->writeToCache($cacheKey, $isInGroup);
return $isInGroup;
}
$groupDN = $this->access->groupname2dn($gid);
// just in case
if(!$groupDN || !$userDN) {
$this->access->connection->writeToCache($cacheKey, false);
return false;
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}
//check primary group first
if($gid === $this->getUserPrimaryGroup($userDN)) {
$this->access->connection->writeToCache($cacheKey, true);
return true;
}
//usually, LDAP attributes are said to be case insensitive. But there are exceptions of course.
$members = $this->_groupMembers($groupDN);
$members = array_keys($members); // uids are returned as keys
if(!is_array($members) || count($members) === 0) {
$this->access->connection->writeToCache($cacheKey, false);
return false;
}
//extra work if we don't get back user DNs
if(strtolower($this->access->connection->ldapGroupMemberAssocAttr) === 'memberuid') {
$dns = array();
$filterParts = array();
$bytes = 0;
foreach($members as $mid) {
$filter = str_replace('%uid', $mid, $this->access->connection->ldapLoginFilter);
$filterParts[] = $filter;
$bytes += strlen($filter);
if($bytes >= 9000000) {
// AD has a default input buffer of 10 MB, we do not want
// to take even the chance to exceed it
$filter = $this->access->combineFilterWithOr($filterParts);
$bytes = 0;
$filterParts = array();
$users = $this->access->fetchListOfUsers($filter, 'dn', count($filterParts));
$dns = array_merge($dns, $users);
}
}
if(count($filterParts) > 0) {
$filter = $this->access->combineFilterWithOr($filterParts);
$users = $this->access->fetchListOfUsers($filter, 'dn', count($filterParts));
$dns = array_merge($dns, $users);
}
$members = $dns;
}
$isInGroup = in_array($userDN, $members);
$this->access->connection->writeToCache($cacheKey, $isInGroup);
$this->access->connection->writeToCache($cacheKeyMembers, $members);
$this->cachedGroupMembers[$gid] = $members;
return $isInGroup;
}
/**
* @param string $dnGroup
* @param array|null &$seen
* @return array|mixed|null
*/
private function _groupMembers($dnGroup, &$seen = null) {
if ($seen === null) {
$seen = array();
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}
$allMembers = array();
if (array_key_exists($dnGroup, $seen)) {
// avoid loops
return array();
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}
// used extensively in cron job, caching makes sense for nested groups
$cacheKey = '_groupMembers'.$dnGroup;
if($this->access->connection->isCached($cacheKey)) {
return $this->access->connection->getFromCache($cacheKey);
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}
$seen[$dnGroup] = 1;
$members = $this->access->readAttribute($dnGroup, $this->access->connection->ldapGroupMemberAssocAttr,
$this->access->connection->ldapGroupFilter);
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if (is_array($members)) {
foreach ($members as $memberDN) {
$allMembers[$memberDN] = 1;
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$nestedGroups = $this->access->connection->ldapNestedGroups;
if (!empty($nestedGroups)) {
$subMembers = $this->_groupMembers($memberDN, $seen);
if ($subMembers) {
$allMembers = array_merge($allMembers, $subMembers);
}
}
}
}
$this->access->connection->writeToCache($cacheKey, $allMembers);
return $allMembers;
}
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/**
* @param string $DN
* @param array|null &$seen
* @return array
*/
private function _getGroupDNsFromMemberOf($DN, &$seen = null) {
if ($seen === null) {
$seen = array();
}
if (array_key_exists($DN, $seen)) {
// avoid loops
return array();
}
$seen[$DN] = 1;
$groups = $this->access->readAttribute($DN, 'memberOf');
if (!is_array($groups)) {
return array();
}
$groups = $this->access->groupsMatchFilter($groups);
$allGroups = $groups;
$nestedGroups = $this->access->connection->ldapNestedGroups;
if (intval($nestedGroups) === 1) {
foreach ($groups as $group) {
$subGroups = $this->_getGroupDNsFromMemberOf($group, $seen);
$allGroups = array_merge($allGroups, $subGroups);
}
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}
return $allGroups;
}
/**
* translates a primary group ID into an ownCloud internal name
* @param string $gid as given by primaryGroupID on AD
* @param string $dn a DN that belongs to the same domain as the group
* @return string|bool
*/
public function primaryGroupID2Name($gid, $dn) {
$cacheKey = 'primaryGroupIDtoName';
if($this->access->connection->isCached($cacheKey)) {
$groupNames = $this->access->connection->getFromCache($cacheKey);
if(isset($groupNames[$gid])) {
return $groupNames[$gid];
}
}
$domainObjectSid = $this->access->getSID($dn);
if($domainObjectSid === false) {
return false;
}
//we need to get the DN from LDAP
$filter = $this->access->combineFilterWithAnd(array(
$this->access->connection->ldapGroupFilter,
'objectsid=' . $domainObjectSid . '-' . $gid
));
$result = $this->access->searchGroups($filter, array('dn'), 1);
if(empty($result)) {
return false;
}
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$dn = $result[0]['dn'][0];
//and now the group name
//NOTE once we have separate ownCloud group IDs and group names we can
//directly read the display name attribute instead of the DN
$name = $this->access->dn2groupname($dn);
$this->access->connection->writeToCache($cacheKey, $name);
return $name;
}
/**
* returns the entry's primary group ID
* @param string $dn
* @param string $attribute
* @return string|bool
*/
private function getEntryGroupID($dn, $attribute) {
$value = $this->access->readAttribute($dn, $attribute);
if(is_array($value) && !empty($value)) {
return $value[0];
}
return false;
}
/**
* returns the group's primary ID
* @param string $dn
* @return string|bool
*/
public function getGroupPrimaryGroupID($dn) {
return $this->getEntryGroupID($dn, 'primaryGroupToken');
}
/**
* returns the user's primary group ID
* @param string $dn
* @return string|bool
*/
public function getUserPrimaryGroupIDs($dn) {
$primaryGroupID = false;
if($this->access->connection->hasPrimaryGroups) {
$primaryGroupID = $this->getEntryGroupID($dn, 'primaryGroupID');
if($primaryGroupID === false) {
$this->access->connection->hasPrimaryGroups = false;
}
}
return $primaryGroupID;
}
/**
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* returns a filter for a "users in primary group" search or count operation
*
* @param string $groupDN
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* @param string $search
* @return string
* @throws \Exception
*/
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private function prepareFilterForUsersInPrimaryGroup($groupDN, $search = '') {
$groupID = $this->getGroupPrimaryGroupID($groupDN);
if($groupID === false) {
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throw new \Exception('Not a valid group');
}
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$filterParts = [];
$filterParts[] = $this->access->getFilterForUserCount();
if(!empty($search)) {
$filterParts[] = $this->access->getFilterPartForUserSearch($search);
}
$filterParts[] = 'primaryGroupID=' . $groupID;
$filter = $this->access->combineFilterWithAnd($filterParts);
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return $filter;
}
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/**
* returns a list of users that have the given group as primary group
*
* @param string $groupDN
* @param string $search
* @param int $limit
* @param int $offset
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* @return string[]
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*/
public function getUsersInPrimaryGroup($groupDN, $search = '', $limit = -1, $offset = 0) {
try {
$filter = $this->prepareFilterForUsersInPrimaryGroup($groupDN, $search);
$users = $this->access->fetchListOfUsers(
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$filter,
array($this->access->connection->ldapUserDisplayName, 'dn'),
$limit,
$offset
);
return $this->access->ownCloudUserNames($users);
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} catch (\Exception $e) {
return array();
}
}
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/**
* returns the number of users that have the given group as primary group
*
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* @param string $groupDN
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* @param string $search
* @param int $limit
* @param int $offset
* @return int
*/
public function countUsersInPrimaryGroup($groupDN, $search = '', $limit = -1, $offset = 0) {
try {
$filter = $this->prepareFilterForUsersInPrimaryGroup($groupDN, $search);
$users = $this->access->countUsers($filter, array('dn'), $limit, $offset);
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return (int)$users;
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} catch (\Exception $e) {
return 0;
}
}
/**
* gets the primary group of a user
* @param string $dn
* @return string
*/
public function getUserPrimaryGroup($dn) {
$groupID = $this->getUserPrimaryGroupIDs($dn);
if($groupID !== false) {
$groupName = $this->primaryGroupID2Name($groupID, $dn);
if($groupName !== false) {
return $groupName;
}
}
return false;
}
/**
* Get all groups a user belongs to
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* @param string $uid Name of the user
* @return array with group names
*
* This function fetches all groups a user belongs to. It does not check
* if the user exists at all.
*/
public function getUserGroups($uid) {
if(!$this->enabled) {
return array();
}
$cacheKey = 'getUserGroups'.$uid;
if($this->access->connection->isCached($cacheKey)) {
return $this->access->connection->getFromCache($cacheKey);
}
$userDN = $this->access->username2dn($uid);
if(!$userDN) {
$this->access->connection->writeToCache($cacheKey, array());
return array();
}
$groups = [];
$primaryGroup = $this->getUserPrimaryGroup($userDN);
// if possible, read out membership via memberOf. It's far faster than
// performing a search, which still is a fallback later.
if(intval($this->access->connection->hasMemberOfFilterSupport) === 1
&& intval($this->access->connection->useMemberOfToDetectMembership) === 1
) {
$groupDNs = $this->_getGroupDNsFromMemberOf($userDN);
if (is_array($groupDNs)) {
foreach ($groupDNs as $dn) {
$groupName = $this->access->dn2groupname($dn);
if(is_string($groupName)) {
// be sure to never return false if the dn could not be
// resolved to a name, for whatever reason.
$groups[] = $groupName;
}
}
}
if($primaryGroup !== false) {
$groups[] = $primaryGroup;
}
$this->access->connection->writeToCache($cacheKey, $groups);
return $groups;
}
//uniqueMember takes DN, memberuid the uid, so we need to distinguish
if((strtolower($this->access->connection->ldapGroupMemberAssocAttr) === 'uniquemember')
|| (strtolower($this->access->connection->ldapGroupMemberAssocAttr) === 'member')
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) {
$uid = $userDN;
} else if(strtolower($this->access->connection->ldapGroupMemberAssocAttr) === 'memberuid') {
$result = $this->access->readAttribute($userDN, 'uid');
if ($result === false) {
\OCP\Util::writeLog('user_ldap', 'No uid attribute found for DN ' . $userDN . ' on '.
$this->access->connection->ldapHost, \OCP\Util::DEBUG);
}
$uid = $result[0];
} else {
// just in case
$uid = $userDN;
}
if(isset($this->cachedGroupsByMember[$uid])) {
$groups = $this->cachedGroupsByMember[$uid];
} else {
$groups = array_values($this->getGroupsByMember($uid));
$groups = $this->access->ownCloudGroupNames($groups);
$this->cachedGroupsByMember[$uid] = $groups;
}
if($primaryGroup !== false) {
$groups[] = $primaryGroup;
}
$groups = array_unique($groups, SORT_LOCALE_STRING);
$this->access->connection->writeToCache($cacheKey, $groups);
return $groups;
}
/**
* @param string $dn
* @param array|null &$seen
* @return array
*/
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private function getGroupsByMember($dn, &$seen = null) {
if ($seen === null) {
$seen = array();
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}
$allGroups = array();
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if (array_key_exists($dn, $seen)) {
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// avoid loops
return array();
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}
$seen[$dn] = true;
$filter = $this->access->combineFilterWithAnd(array(
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$this->access->connection->ldapGroupFilter,
$this->access->connection->ldapGroupMemberAssocAttr.'='.$dn
));
$groups = $this->access->fetchListOfGroups($filter,
array($this->access->connection->ldapGroupDisplayName, 'dn'));
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if (is_array($groups)) {
foreach ($groups as $groupobj) {
$groupDN = $groupobj['dn'][0];
$allGroups[$groupDN] = $groupobj;
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$nestedGroups = $this->access->connection->ldapNestedGroups;
if (!empty($nestedGroups)) {
$supergroups = $this->getGroupsByMember($groupDN, $seen);
if (is_array($supergroups) && (count($supergroups)>0)) {
$allGroups = array_merge($allGroups, $supergroups);
}
}
}
}
return $allGroups;
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}
/**
* get a list of all users in a group
*
* @param string $gid
* @param string $search
* @param int $limit
* @param int $offset
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* @return array with user ids
*/
public function usersInGroup($gid, $search = '', $limit = -1, $offset = 0) {
if(!$this->enabled) {
return array();
}
if(!$this->groupExists($gid)) {
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return array();
}
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$search = $this->access->escapeFilterPart($search, true);
$cacheKey = 'usersInGroup-'.$gid.'-'.$search.'-'.$limit.'-'.$offset;
// check for cache of the exact query
$groupUsers = $this->access->connection->getFromCache($cacheKey);
if(!is_null($groupUsers)) {
return $groupUsers;
}
// check for cache of the query without limit and offset
$groupUsers = $this->access->connection->getFromCache('usersInGroup-'.$gid.'-'.$search);
if(!is_null($groupUsers)) {
$groupUsers = array_slice($groupUsers, $offset, $limit);
$this->access->connection->writeToCache($cacheKey, $groupUsers);
return $groupUsers;
}
if($limit === -1) {
$limit = null;
}
$groupDN = $this->access->groupname2dn($gid);
if(!$groupDN) {
// group couldn't be found, return empty resultset
$this->access->connection->writeToCache($cacheKey, array());
return array();
}
$primaryUsers = $this->getUsersInPrimaryGroup($groupDN, $search, $limit, $offset);
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$members = array_keys($this->_groupMembers($groupDN));
if(!$members && empty($primaryUsers)) {
//in case users could not be retrieved, return empty result set
$this->access->connection->writeToCache($cacheKey, array());
return array();
}
$groupUsers = array();
$isMemberUid = (strtolower($this->access->connection->ldapGroupMemberAssocAttr) === 'memberuid');
$attrs = $this->access->userManager->getAttributes(true);
foreach($members as $member) {
if($isMemberUid) {
//we got uids, need to get their DNs to 'translate' them to user names
$filter = $this->access->combineFilterWithAnd(array(
str_replace('%uid', $member, $this->access->connection->ldapLoginFilter),
$this->access->getFilterPartForUserSearch($search)
));
$ldap_users = $this->access->fetchListOfUsers($filter, $attrs, 1);
if(count($ldap_users) < 1) {
continue;
}
$groupUsers[] = $this->access->dn2username($ldap_users[0]['dn'][0]);
} else {
//we got DNs, check if we need to filter by search or we can give back all of them
if(!empty($search)) {
if(!$this->access->readAttribute($member,
$this->access->connection->ldapUserDisplayName,
$this->access->getFilterPartForUserSearch($search))) {
continue;
}
}
// dn2username will also check if the users belong to the allowed base
if($ocname = $this->access->dn2username($member)) {
$groupUsers[] = $ocname;
}
}
}
$groupUsers = array_unique(array_merge($groupUsers, $primaryUsers));
natsort($groupUsers);
$this->access->connection->writeToCache('usersInGroup-'.$gid.'-'.$search, $groupUsers);
$groupUsers = array_slice($groupUsers, $offset, $limit);
$this->access->connection->writeToCache($cacheKey, $groupUsers);
return $groupUsers;
}
/**
* returns the number of users in a group, who match the search term
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* @param string $gid the internal group name
* @param string $search optional, a search string
* @return int|bool
*/
public function countUsersInGroup($gid, $search = '') {
$cacheKey = 'countUsersInGroup-'.$gid.'-'.$search;
if(!$this->enabled || !$this->groupExists($gid)) {
return false;
}
$groupUsers = $this->access->connection->getFromCache($cacheKey);
if(!is_null($groupUsers)) {
return $groupUsers;
}
$groupDN = $this->access->groupname2dn($gid);
if(!$groupDN) {
// group couldn't be found, return empty result set
$this->access->connection->writeToCache($cacheKey, false);
return false;
}
$members = array_keys($this->_groupMembers($groupDN));
$primaryUserCount = $this->countUsersInPrimaryGroup($groupDN, '');
if(!$members && $primaryUserCount === 0) {
//in case users could not be retrieved, return empty result set
$this->access->connection->writeToCache($cacheKey, false);
return false;
}
if(empty($search)) {
$groupUsers = count($members) + $primaryUserCount;
$this->access->connection->writeToCache($cacheKey, $groupUsers);
return $groupUsers;
}
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$search = $this->access->escapeFilterPart($search, true);
$isMemberUid =
(strtolower($this->access->connection->ldapGroupMemberAssocAttr)
=== 'memberuid');
//we need to apply the search filter
//alternatives that need to be checked:
//a) get all users by search filter and array_intersect them
//b) a, but only when less than 1k 10k ?k users like it is
//c) put all DNs|uids in a LDAP filter, combine with the search string
// and let it count.
//For now this is not important, because the only use of this method
//does not supply a search string
$groupUsers = array();
foreach($members as $member) {
if($isMemberUid) {
//we got uids, need to get their DNs to 'translate' them to user names
$filter = $this->access->combineFilterWithAnd(array(
str_replace('%uid', $member, $this->access->connection->ldapLoginFilter),
$this->access->getFilterPartForUserSearch($search)
));
$ldap_users = $this->access->fetchListOfUsers($filter, 'dn', 1);
if(count($ldap_users) < 1) {
continue;
}
$groupUsers[] = $this->access->dn2username($ldap_users[0]);
} else {
//we need to apply the search filter now
if(!$this->access->readAttribute($member,
$this->access->connection->ldapUserDisplayName,
$this->access->getFilterPartForUserSearch($search))) {
continue;
}
// dn2username will also check if the users belong to the allowed base
if($ocname = $this->access->dn2username($member)) {
$groupUsers[] = $ocname;
}
}
}
//and get users that have the group as primary
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$primaryUsers = $this->countUsersInPrimaryGroup($groupDN, $search);
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return count($groupUsers) + $primaryUsers;
}
/**
* get a list of all groups
*
* @param string $search
* @param $limit
* @param int $offset
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* @return array with group names
*
* Returns a list with all groups (used by getGroups)
*/
protected function getGroupsChunk($search = '', $limit = -1, $offset = 0) {
if(!$this->enabled) {
return array();
}
$cacheKey = 'getGroups-'.$search.'-'.$limit.'-'.$offset;
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//Check cache before driving unnecessary searches
\OCP\Util::writeLog('user_ldap', 'getGroups '.$cacheKey, \OCP\Util::DEBUG);
$ldap_groups = $this->access->connection->getFromCache($cacheKey);
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if(!is_null($ldap_groups)) {
return $ldap_groups;
}
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// if we'd pass -1 to LDAP search, we'd end up in a Protocol
// error. With a limit of 0, we get 0 results. So we pass null.
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if($limit <= 0) {
$limit = null;
}
$filter = $this->access->combineFilterWithAnd(array(
$this->access->connection->ldapGroupFilter,
$this->access->getFilterPartForGroupSearch($search)
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));
\OCP\Util::writeLog('user_ldap', 'getGroups Filter '.$filter, \OCP\Util::DEBUG);
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$ldap_groups = $this->access->fetchListOfGroups($filter,
array($this->access->connection->ldapGroupDisplayName, 'dn'),
$limit,
$offset);
$ldap_groups = $this->access->ownCloudGroupNames($ldap_groups);
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$this->access->connection->writeToCache($cacheKey, $ldap_groups);
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return $ldap_groups;
}
/**
* get a list of all groups using a paged search
*
* @param string $search
* @param int $limit
* @param int $offset
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* @return array with group names
*
* Returns a list with all groups
* Uses a paged search if available to override a
* server side search limit.
* (active directory has a limit of 1000 by default)
*/
public function getGroups($search = '', $limit = -1, $offset = 0) {
if(!$this->enabled) {
return array();
}
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$search = $this->access->escapeFilterPart($search, true);
$pagingSize = $this->access->connection->ldapPagingSize;
if ((! $this->access->connection->hasPagedResultSupport)
|| empty($pagingSize)) {
return $this->getGroupsChunk($search, $limit, $offset);
}
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$maxGroups = 100000; // limit max results (just for safety reasons)
if ($limit > -1) {
$overallLimit = min($limit + $offset, $maxGroups);
} else {
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$overallLimit = $maxGroups;
}
$chunkOffset = $offset;
$allGroups = array();
while ($chunkOffset < $overallLimit) {
$chunkLimit = min($pagingSize, $overallLimit - $chunkOffset);
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$ldapGroups = $this->getGroupsChunk($search, $chunkLimit, $chunkOffset);
$nread = count($ldapGroups);
\OCP\Util::writeLog('user_ldap', 'getGroups('.$search.'): read '.$nread.' at offset '.$chunkOffset.' (limit: '.$chunkLimit.')', \OCP\Util::DEBUG);
if ($nread) {
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$allGroups = array_merge($allGroups, $ldapGroups);
$chunkOffset += $nread;
}
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if ($nread < $chunkLimit) {
break;
}
}
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return $allGroups;
}
/**
* @param string $group
* @return bool
*/
public function groupMatchesFilter($group) {
return (strripos($group, $this->groupSearch) !== false);
}
/**
* check if a group exists
* @param string $gid
* @return bool
*/
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public function groupExists($gid) {
if($this->access->connection->isCached('groupExists'.$gid)) {
return $this->access->connection->getFromCache('groupExists'.$gid);
}
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//getting dn, if false the group does not exist. If dn, it may be mapped
//only, requires more checking.
$dn = $this->access->groupname2dn($gid);
if(!$dn) {
$this->access->connection->writeToCache('groupExists'.$gid, false);
return false;
}
//if group really still exists, we will be able to read its objectclass
if(!is_array($this->access->readAttribute($dn, ''))) {
$this->access->connection->writeToCache('groupExists'.$gid, false);
return false;
}
$this->access->connection->writeToCache('groupExists'.$gid, true);
return true;
}
/**
* Check if backend implements actions
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* @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) {
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return (bool)(\OC_Group_Backend::COUNT_USERS & $actions);
}
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}