493 lines
15 KiB
PHP
493 lines
15 KiB
PHP
<?php
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/**
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* ownCloud – LDAP group backend
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*
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* @author Arthur Schiwon
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* @copyright 2012 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;
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use OCA\user_ldap\lib\Access;
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use OCA\user_ldap\lib\BackendUtility;
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class GROUP_LDAP extends BackendUtility implements \OCP\GroupInterface {
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protected $enabled = false;
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public function __construct(Access $access) {
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parent::__construct($access);
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$filter = $this->access->connection->ldapGroupFilter;
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$gassoc = $this->access->connection->ldapGroupMemberAssocAttr;
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if(!empty($filter) && !empty($gassoc)) {
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$this->enabled = true;
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}
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}
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/**
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* is user in group?
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* @param string $uid uid of the user
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* @param string $gid gid of the group
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* @return bool
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*
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* Checks whether the user is member of a group or not.
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*/
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public function inGroup($uid, $gid) {
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if(!$this->enabled) {
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return false;
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}
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if($this->access->connection->isCached('inGroup'.$uid.':'.$gid)) {
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return $this->access->connection->getFromCache('inGroup'.$uid.':'.$gid);
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}
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$dn_user = $this->access->username2dn($uid);
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$dn_group = $this->access->groupname2dn($gid);
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// just in case
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if(!$dn_group || !$dn_user) {
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$this->access->connection->writeToCache('inGroup'.$uid.':'.$gid, false);
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return false;
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}
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//usually, LDAP attributes are said to be case insensitive. But there are exceptions of course.
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$members = array_keys($this->_groupMembers($dn_group));
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if(!$members) {
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$this->access->connection->writeToCache('inGroup'.$uid.':'.$gid, false);
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return false;
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}
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//extra work if we don't get back user DNs
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//TODO: this can be done with one LDAP query
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if(strtolower($this->access->connection->ldapGroupMemberAssocAttr) === 'memberuid') {
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$dns = array();
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foreach($members as $mid) {
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$filter = str_replace('%uid', $mid, $this->access->connection->ldapLoginFilter);
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$ldap_users = $this->access->fetchListOfUsers($filter, 'dn');
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if(count($ldap_users) < 1) {
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continue;
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}
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$dns[] = $ldap_users[0];
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}
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$members = $dns;
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}
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$isInGroup = in_array($dn_user, $members);
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$this->access->connection->writeToCache('inGroup'.$uid.':'.$gid, $isInGroup);
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return $isInGroup;
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}
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/**
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* @param string $dnGroup
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* @param array|null &$seen
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*/
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private function _groupMembers($dnGroup, &$seen = null) {
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if ($seen === null) {
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$seen = array();
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}
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$allMembers = array();
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if (array_key_exists($dnGroup, $seen)) {
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// avoid loops
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return array();
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}
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// used extensively in cron job, caching makes sense for nested groups
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$cacheKey = '_groupMembers'.$dnGroup;
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if($this->access->connection->isCached($cacheKey)) {
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return $this->access->connection->getFromCache($cacheKey);
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}
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$seen[$dnGroup] = 1;
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$members = $this->access->readAttribute($dnGroup, $this->access->connection->ldapGroupMemberAssocAttr,
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$this->access->connection->ldapGroupFilter);
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if (is_array($members)) {
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foreach ($members as $memberDN) {
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$allMembers[$memberDN] = 1;
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$nestedGroups = $this->access->connection->ldapNestedGroups;
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if (!empty($nestedGroups)) {
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$subMembers = $this->_groupMembers($memberDN, $seen);
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if ($subMembers) {
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$allMembers = array_merge($allMembers, $subMembers);
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}
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}
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}
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}
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$this->access->connection->writeToCache($cacheKey, $allMembers);
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return $allMembers;
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}
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/**
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* Get all groups a user belongs to
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* @param string $uid Name of the user
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* @return array with group names
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*
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* This function fetches all groups a user belongs to. It does not check
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* if the user exists at all.
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*/
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public function getUserGroups($uid) {
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if(!$this->enabled) {
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return array();
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}
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$cacheKey = 'getUserGroups'.$uid;
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if($this->access->connection->isCached($cacheKey)) {
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return $this->access->connection->getFromCache($cacheKey);
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}
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$userDN = $this->access->username2dn($uid);
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if(!$userDN) {
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$this->access->connection->writeToCache($cacheKey, array());
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return array();
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}
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//uniqueMember takes DN, memberuid the uid, so we need to distinguish
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if((strtolower($this->access->connection->ldapGroupMemberAssocAttr) === 'uniquemember')
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|| (strtolower($this->access->connection->ldapGroupMemberAssocAttr) === 'member')
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) {
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$uid = $userDN;
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} else if(strtolower($this->access->connection->ldapGroupMemberAssocAttr) === 'memberuid') {
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$result = $this->access->readAttribute($userDN, 'uid');
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$uid = $result[0];
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} else {
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// just in case
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$uid = $userDN;
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}
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$groups = array_values($this->getGroupsByMember($uid));
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$groups = array_unique($this->access->ownCloudGroupNames($groups), SORT_LOCALE_STRING);
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$this->access->connection->writeToCache($cacheKey, $groups);
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return $groups;
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}
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/**
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* @param string $dn
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* @param array|null &$seen
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*/
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private function getGroupsByMember($dn, &$seen = null) {
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if ($seen === null) {
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$seen = array();
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}
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$allGroups = array();
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if (array_key_exists($dn, $seen)) {
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// avoid loops
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return array();
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}
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$seen[$dn] = true;
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$filter = $this->access->combineFilterWithAnd(array(
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$this->access->connection->ldapGroupFilter,
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$this->access->connection->ldapGroupMemberAssocAttr.'='.$dn
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));
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$groups = $this->access->fetchListOfGroups($filter,
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array($this->access->connection->ldapGroupDisplayName, 'dn'));
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if (is_array($groups)) {
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foreach ($groups as $groupobj) {
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$groupDN = $groupobj['dn'];
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$allGroups[$groupDN] = $groupobj;
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$nestedGroups = $this->access->connection->ldapNestedGroups;
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if (!empty($nestedGroups)) {
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$supergroups = $this->getGroupsByMember($groupDN, $seen);
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if (is_array($supergroups) && (count($supergroups)>0)) {
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$allGroups = array_merge($allGroups, $supergroups);
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}
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}
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}
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}
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return $allGroups;
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}
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/**
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* get a list of all users in a group
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* @return array with user ids
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*/
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public function usersInGroup($gid, $search = '', $limit = -1, $offset = 0) {
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if(!$this->enabled) {
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return array();
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}
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if(!$this->groupExists($gid)) {
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return array();
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}
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$cachekey = 'usersInGroup-'.$gid.'-'.$search.'-'.$limit.'-'.$offset;
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// check for cache of the exact query
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$groupUsers = $this->access->connection->getFromCache($cachekey);
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if(!is_null($groupUsers)) {
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return $groupUsers;
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}
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// check for cache of the query without limit and offset
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$groupUsers = $this->access->connection->getFromCache('usersInGroup-'.$gid.'-'.$search);
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if(!is_null($groupUsers)) {
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$groupUsers = array_slice($groupUsers, $offset, $limit);
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$this->access->connection->writeToCache($cachekey, $groupUsers);
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return $groupUsers;
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}
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if($limit === -1) {
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$limit = null;
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}
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$groupDN = $this->access->groupname2dn($gid);
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if(!$groupDN) {
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// group couldn't be found, return empty resultset
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$this->access->connection->writeToCache($cachekey, array());
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return array();
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}
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$members = array_keys($this->_groupMembers($groupDN));
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if(!$members) {
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//in case users could not be retrieved, return empty resultset
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$this->access->connection->writeToCache($cachekey, array());
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return array();
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}
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$groupUsers = array();
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$isMemberUid = (strtolower($this->access->connection->ldapGroupMemberAssocAttr) === 'memberuid');
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foreach($members as $member) {
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if($isMemberUid) {
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//we got uids, need to get their DNs to 'tranlsate' them to usernames
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$filter = $this->access->combineFilterWithAnd(array(
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\OCP\Util::mb_str_replace('%uid', $member,
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$this->access->connection->ldapLoginFilter, 'UTF-8'),
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$this->access->getFilterPartForUserSearch($search)
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));
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$ldap_users = $this->access->fetchListOfUsers($filter, 'dn');
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if(count($ldap_users) < 1) {
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continue;
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}
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$groupUsers[] = $this->access->dn2username($ldap_users[0]);
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} else {
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//we got DNs, check if we need to filter by search or we can give back all of them
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if(!empty($search)) {
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if(!$this->access->readAttribute($member,
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$this->access->connection->ldapUserDisplayName,
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$this->access->getFilterPartForUserSearch($search))) {
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continue;
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}
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}
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// dn2username will also check if the users belong to the allowed base
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if($ocname = $this->access->dn2username($member)) {
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$groupUsers[] = $ocname;
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}
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}
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}
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natsort($groupUsers);
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$this->access->connection->writeToCache('usersInGroup-'.$gid.'-'.$search, $groupUsers);
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$groupUsers = array_slice($groupUsers, $offset, $limit);
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$this->access->connection->writeToCache($cachekey, $groupUsers);
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return $groupUsers;
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}
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/**
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* returns the number of users in a group, who match the search term
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* @param string $gid the internal group name
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* @param string $search optional, a search string
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* @return int|bool
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*/
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public function countUsersInGroup($gid, $search = '') {
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$cachekey = 'countUsersInGroup-'.$gid.'-'.$search;
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if(!$this->enabled || !$this->groupExists($gid)) {
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return false;
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}
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$groupUsers = $this->access->connection->getFromCache($cachekey);
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if(!is_null($groupUsers)) {
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return $groupUsers;
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}
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$groupDN = $this->access->groupname2dn($gid);
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if(!$groupDN) {
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// group couldn't be found, return empty resultset
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$this->access->connection->writeToCache($cachekey, false);
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return false;
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}
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$members = array_keys($this->_groupMembers($groupDN));
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if(!$members) {
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//in case users could not be retrieved, return empty resultset
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$this->access->connection->writeToCache($cachekey, false);
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return false;
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}
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if(empty($search)) {
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$groupUsers = count($members);
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$this->access->connection->writeToCache($cachekey, $groupUsers);
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return $groupUsers;
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}
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$isMemberUid =
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(strtolower($this->access->connection->ldapGroupMemberAssocAttr)
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=== 'memberuid');
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//we need to apply the search filter
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//alternatives that need to be checked:
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//a) get all users by search filter and array_intersect them
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//b) a, but only when less than 1k 10k ?k users like it is
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//c) put all DNs|uids in a LDAP filter, combine with the search string
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// and let it count.
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//For now this is not important, because the only use of this method
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//does not supply a search string
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$groupUsers = array();
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foreach($members as $member) {
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if($isMemberUid) {
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//we got uids, need to get their DNs to 'tranlsate' them to usernames
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$filter = $this->access->combineFilterWithAnd(array(
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\OCP\Util::mb_str_replace('%uid', $member,
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$this->access->connection->ldapLoginFilter, 'UTF-8'),
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$this->access->getFilterPartForUserSearch($search)
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));
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$ldap_users = $this->access->fetchListOfUsers($filter, 'dn');
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if(count($ldap_users) < 1) {
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continue;
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}
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$groupUsers[] = $this->access->dn2username($ldap_users[0]);
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} else {
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//we need to apply the search filter now
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if(!$this->access->readAttribute($member,
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$this->access->connection->ldapUserDisplayName,
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$this->access->getFilterPartForUserSearch($search))) {
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continue;
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}
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// dn2username will also check if the users belong to the allowed base
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if($ocname = $this->access->dn2username($member)) {
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$groupUsers[] = $ocname;
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}
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}
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}
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return count($groupUsers);
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}
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/**
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* get a list of all groups
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* @return array with group names
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*
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* Returns a list with all groups (used by getGroups)
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*/
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protected function getGroupsChunk($search = '', $limit = -1, $offset = 0) {
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if(!$this->enabled) {
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return array();
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}
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$cachekey = 'getGroups-'.$search.'-'.$limit.'-'.$offset;
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//Check cache before driving unnecessary searches
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\OCP\Util::writeLog('user_ldap', 'getGroups '.$cachekey, \OCP\Util::DEBUG);
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$ldap_groups = $this->access->connection->getFromCache($cachekey);
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if(!is_null($ldap_groups)) {
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return $ldap_groups;
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}
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// if we'd pass -1 to LDAP search, we'd end up in a Protocol
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// error. With a limit of 0, we get 0 results. So we pass null.
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if($limit <= 0) {
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$limit = null;
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}
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$filter = $this->access->combineFilterWithAnd(array(
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$this->access->connection->ldapGroupFilter,
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$this->access->getFilterPartForGroupSearch($search)
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));
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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,
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array($this->access->connection->ldapGroupDisplayName, 'dn'),
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$limit,
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$offset);
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$ldap_groups = $this->access->ownCloudGroupNames($ldap_groups);
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$this->access->connection->writeToCache($cachekey, $ldap_groups);
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return $ldap_groups;
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}
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/**
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* get a list of all groups using a paged search
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* @return array with group names
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*
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* Returns a list with all groups
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* Uses a paged search if available to override a
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* server side search limit.
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* (active directory has a limit of 1000 by default)
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*/
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public function getGroups($search = '', $limit = -1, $offset = 0) {
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if(!$this->enabled) {
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return array();
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}
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$pagingsize = $this->access->connection->ldapPagingSize;
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if ((! $this->access->connection->hasPagedResultSupport)
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|| empty($pagingsize)) {
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return $this->getGroupsChunk($search, $limit, $offset);
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}
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$maxGroups = 100000; // limit max results (just for safety reasons)
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if ($limit > -1) {
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$overallLimit = min($limit, $maxGroups);
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} else {
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$overallLimit = $maxGroups;
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}
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$chunkOffset = $offset;
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$allGroups = array();
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while ($chunkOffset < $overallLimit) {
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$chunkLimit = min($pagingsize, $overallLimit - $chunkOffset);
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$ldapGroups = $this->getGroupsChunk($search, $chunkLimit, $chunkOffset);
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$nread = count($ldapGroups);
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\OCP\Util::writeLog('user_ldap', 'getGroups('.$search.'): read '.$nread.' at offset '.$chunkOffset.' (limit: '.$chunkLimit.')', \OCP\Util::DEBUG);
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if ($nread) {
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$allGroups = array_merge($allGroups, $ldapGroups);
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$chunkOffset += $nread;
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}
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if ($nread < $chunkLimit) {
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break;
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}
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}
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return $allGroups;
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}
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/**
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* @param string $group
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*/
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public function groupMatchesFilter($group) {
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return (strripos($group, $this->groupSearch) !== false);
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}
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/**
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* check if a group exists
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* @param string $gid
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* @return bool
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*/
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public function groupExists($gid) {
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if($this->access->connection->isCached('groupExists'.$gid)) {
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return $this->access->connection->getFromCache('groupExists'.$gid);
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}
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//getting dn, if false the group does not exist. If dn, it may be mapped
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//only, requires more checking.
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$dn = $this->access->groupname2dn($gid);
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if(!$dn) {
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$this->access->connection->writeToCache('groupExists'.$gid, false);
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return false;
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}
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//if group really still exists, we will be able to read its objectclass
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$objcs = $this->access->readAttribute($dn, 'objectclass');
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if(!$objcs || empty($objcs)) {
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$this->access->connection->writeToCache('groupExists'.$gid, false);
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return false;
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}
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$this->access->connection->writeToCache('groupExists'.$gid, true);
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return true;
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}
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/**
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* Check if backend implements actions
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* @param int $actions bitwise-or'ed actions
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* @return boolean
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*
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* Returns the supported actions as int to be
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* compared with OC_USER_BACKEND_CREATE_USER etc.
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*/
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public function implementsActions($actions) {
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return (bool)(OC_GROUP_BACKEND_COUNT_USERS & $actions);
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}
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}
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