745 lines
22 KiB
PHP
745 lines
22 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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/**
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* @var string[] $cachedGroupMembers array of users with gid as key
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*/
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protected $cachedGroupMembers = array();
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/**
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* @var string[] $cachedGroupsByMember array of groups with uid as key
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*/
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protected $cachedGroupsByMember = array();
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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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$cacheKey = 'inGroup'.$uid.':'.$gid;
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if($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(isset($this->cachedGroupMembers[$gid])) {
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$isInGroup = in_array($userDN, $this->cachedGroupMembers[$gid]);
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return $isInGroup;
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}
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$cacheKeyMembers = 'inGroup-members:'.$gid;
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if($this->access->connection->isCached($cacheKeyMembers)) {
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$members = $this->access->connection->getFromCache($cacheKeyMembers);
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$this->cachedGroupMembers[$gid] = $members;
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$isInGroup = in_array($userDN, $members);
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$this->access->connection->writeToCache($cacheKey, $isInGroup);
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return $isInGroup;
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}
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$groupDN = $this->access->groupname2dn($gid);
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// just in case
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if(!$groupDN || !$userDN) {
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$this->access->connection->writeToCache($cacheKey, false);
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return false;
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}
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//check primary group first
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if($gid === $this->getUserPrimaryGroup($userDN)) {
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$this->access->connection->writeToCache($cacheKey, true);
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return true;
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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 = $this->_groupMembers($groupDN);
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$members = array_keys($members); // uids are returned as keys
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if(!is_array($members) || count($members) === 0) {
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$this->access->connection->writeToCache($cacheKey, 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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if(strtolower($this->access->connection->ldapGroupMemberAssocAttr) === 'memberuid') {
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$dns = array();
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$filterParts = array();
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$bytes = 0;
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foreach($members as $mid) {
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$filter = str_replace('%uid', $mid, $this->access->connection->ldapLoginFilter);
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$filterParts[] = $filter;
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$bytes += strlen($filter);
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if($bytes >= 9000000) {
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// AD has a default input buffer of 10 MB, we do not want
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// to take even the chance to exceed it
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$filter = $this->access->combineFilterWithOr($filterParts);
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$bytes = 0;
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$filterParts = array();
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$users = $this->access->fetchListOfUsers($filter, 'dn', count($filterParts));
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$dns = array_merge($dns, $users);
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}
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}
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if(count($filterParts) > 0) {
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$filter = $this->access->combineFilterWithOr($filterParts);
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$users = $this->access->fetchListOfUsers($filter, 'dn', count($filterParts));
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$dns = array_merge($dns, $users);
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}
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$members = $dns;
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}
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$isInGroup = in_array($userDN, $members);
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$this->access->connection->writeToCache($cacheKey, $isInGroup);
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$this->access->connection->writeToCache($cacheKeyMembers, $members);
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$this->cachedGroupMembers[$gid] = $members;
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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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* @return array|mixed|null
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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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* translates a primary group ID into an ownCloud internal name
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* @param string $gid as given by primaryGroupID on AD
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* @param string $dn a DN that belongs to the same domain as the group
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* @return string|bool
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*/
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public function primaryGroupID2Name($gid, $dn) {
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$cacheKey = 'primaryGroupIDtoName';
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if($this->access->connection->isCached($cacheKey)) {
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$groupNames = $this->access->connection->getFromCache($cacheKey);
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if(isset($groupNames[$gid])) {
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return $groupNames[$gid];
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}
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}
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$domainObjectSid = $this->access->getSID($dn);
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if($domainObjectSid === false) {
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return false;
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}
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//we need to get the DN from LDAP
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$filter = $this->access->combineFilterWithAnd(array(
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$this->access->connection->ldapGroupFilter,
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'objectsid=' . $domainObjectSid . '-' . $gid
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));
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$result = $this->access->searchGroups($filter, array('dn'), 1);
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if(empty($result)) {
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return false;
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}
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$dn = $result[0];
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//and now the group name
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//NOTE once we have separate ownCloud group IDs and group names we can
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//directly read the display name attribute instead of the DN
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$name = $this->access->dn2groupname($dn);
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$this->access->connection->writeToCache($cacheKey, $name);
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return $name;
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}
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/**
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* returns the entry's primary group ID
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* @param string $dn
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* @param string $attribute
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* @return string|bool
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*/
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private function getEntryGroupID($dn, $attribute) {
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$value = $this->access->readAttribute($dn, $attribute);
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if(is_array($value) && !empty($value)) {
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return $value[0];
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}
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return false;
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}
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/**
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* returns the group's primary ID
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* @param string $dn
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* @return string|bool
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*/
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public function getGroupPrimaryGroupID($dn) {
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return $this->getEntryGroupID($dn, 'primaryGroupToken');
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}
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/**
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* returns the user's primary group ID
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* @param string $dn
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* @return string|bool
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*/
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public function getUserPrimaryGroupIDs($dn) {
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return $this->getEntryGroupID($dn, 'primaryGroupID');
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}
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/**
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* returns a filter for a "users in primary group" search or count operation
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*
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* @param string $groupDN
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* @param string $search
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* @return string
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* @throws \Exception
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*/
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private function prepareFilterForUsersInPrimaryGroup($groupDN, $search = '') {
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$groupID = $this->getGroupPrimaryGroupID($groupDN);
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if($groupID === false) {
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throw new \Exception('Not a valid group');
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}
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$filterParts = [];
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$filterParts[] = $this->access->getFilterForUserCount();
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if(!empty($search)) {
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$filterParts[] = $this->access->getFilterPartForUserSearch($search);
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}
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$filterParts[] = 'primaryGroupID=' . $groupID;
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$filter = $this->access->combineFilterWithAnd($filterParts);
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return $filter;
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}
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/**
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* returns a list of users that have the given group as primary group
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*
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* @param string $groupDN
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* @param string $search
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* @param int $limit
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* @param int $offset
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* @return string[]
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*/
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public function getUsersInPrimaryGroup($groupDN, $search = '', $limit = -1, $offset = 0) {
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try {
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$filter = $this->prepareFilterForUsersInPrimaryGroup($groupDN, $search);
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return $this->access->fetchListOfUsers(
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$filter,
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array($this->access->connection->ldapUserDisplayName, 'dn'),
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$limit,
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$offset
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);
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} catch (\Exception $e) {
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return array();
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}
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}
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/**
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* returns the number of users that have the given group as primary group
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*
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* @param string $groupDN
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* @param string $search
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* @param int $limit
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* @param int $offset
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* @return int
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*/
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public function countUsersInPrimaryGroup($groupDN, $search = '', $limit = -1, $offset = 0) {
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try {
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$filter = $this->prepareFilterForUsersInPrimaryGroup($groupDN, $search);
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$users = $this->access->countUsers($filter, array('dn'), $limit, $offset);
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return (int)$users;
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} catch (\Exception $e) {
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return 0;
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}
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}
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/**
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* gets the primary group of a user
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* @param string $dn
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* @return string
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*/
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public function getUserPrimaryGroup($dn) {
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$groupID = $this->getUserPrimaryGroupIDs($dn);
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if($groupID !== false) {
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$groupName = $this->primaryGroupID2Name($groupID, $dn);
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if($groupName !== false) {
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return $groupName;
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}
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}
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return false;
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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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if ($result === false) {
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\OCP\Util::writeLog('user_ldap', 'No uid attribute found for DN ' . $userDN . ' on '.
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$this->access->connection->ldapHost, \OCP\Util::DEBUG);
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}
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$uid = $result[0];
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} else {
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// just in case
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$uid = $userDN;
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}
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if(isset($this->cachedGroupsByMember[$uid])) {
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$groups = $this->cachedGroupsByMember[$uid];
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} else {
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$groups = array_values($this->getGroupsByMember($uid));
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$groups = $this->access->ownCloudGroupNames($groups);
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$this->cachedGroupsByMember[$uid] = $groups;
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}
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$primaryGroup = $this->getUserPrimaryGroup($userDN);
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if($primaryGroup !== false) {
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$groups[] = $primaryGroup;
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}
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$groups = array_unique($groups, SORT_LOCALE_STRING);
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$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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* @return array
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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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*
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* @param string $gid
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* @param string $search
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* @param int $limit
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* @param int $offset
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* @return array with user ids
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*/
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public function usersInGroup($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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$search = $this->access->escapeFilterPart($search, true);
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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(!$members) {
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//in case users could not be retrieved, return empty result set
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$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 'translate' them to user names
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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, $limit);
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//and get users that have the group as primary
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$primaryUsers = $this->getUsersInPrimaryGroup($groupDN, $search, $limit, $offset);
|
||
$groupUsers = array_unique(array_merge($groupUsers, $primaryUsers));
|
||
|
||
$this->access->connection->writeToCache($cacheKey, $groupUsers);
|
||
|
||
return $groupUsers;
|
||
}
|
||
|
||
/**
|
||
* returns the number of users in a group, who match the search term
|
||
* @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($groupDN));
|
||
if(!$members) {
|
||
//in case users could not be retrieved, return empty result set
|
||
$this->access->connection->writeToCache($cacheKey, false);
|
||
return false;
|
||
}
|
||
|
||
if(empty($search)) {
|
||
$primaryUsers = $this->countUsersInPrimaryGroup($groupDN, '');
|
||
$groupUsers = count($members) + $primaryUsers;
|
||
|
||
$this->access->connection->writeToCache($cacheKey, $groupUsers);
|
||
return $groupUsers;
|
||
}
|
||
$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(
|
||
\OCP\Util::mb_str_replace('%uid', $member,
|
||
$this->access->connection->ldapLoginFilter, 'UTF-8'),
|
||
$this->access->getFilterPartForUserSearch($search)
|
||
));
|
||
$ldap_users = $this->access->fetchListOfUsers($filter, 'dn');
|
||
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
|
||
$primaryUsers = $this->countUsersInPrimaryGroup($groupDN, $search);
|
||
|
||
return count($groupUsers) + $primaryUsers;
|
||
}
|
||
|
||
/**
|
||
* get a list of all groups
|
||
*
|
||
* @param string $search
|
||
* @param $limit
|
||
* @param int $offset
|
||
* @return array with group names
|
||
*
|
||
* Returns a list with all groups (used by getGroups)
|
||
*/
|
||
protected function getGroupsChunk($search = '', $limit = -1, $offset = 0) {
|
||
if(!$this->enabled) {
|
||
return array();
|
||
}
|
||
$cacheKey = 'getGroups-'.$search.'-'.$limit.'-'.$offset;
|
||
|
||
//Check cache before driving unnecessary searches
|
||
\OCP\Util::writeLog('user_ldap', 'getGroups '.$cacheKey, \OCP\Util::DEBUG);
|
||
$ldap_groups = $this->access->connection->getFromCache($cacheKey);
|
||
if(!is_null($ldap_groups)) {
|
||
return $ldap_groups;
|
||
}
|
||
|
||
// if we'd pass -1 to LDAP search, we'd end up in a Protocol
|
||
// error. With a limit of 0, we get 0 results. So we pass null.
|
||
if($limit <= 0) {
|
||
$limit = null;
|
||
}
|
||
$filter = $this->access->combineFilterWithAnd(array(
|
||
$this->access->connection->ldapGroupFilter,
|
||
$this->access->getFilterPartForGroupSearch($search)
|
||
));
|
||
\OCP\Util::writeLog('user_ldap', 'getGroups Filter '.$filter, \OCP\Util::DEBUG);
|
||
$ldap_groups = $this->access->fetchListOfGroups($filter,
|
||
array($this->access->connection->ldapGroupDisplayName, 'dn'),
|
||
$limit,
|
||
$offset);
|
||
$ldap_groups = $this->access->ownCloudGroupNames($ldap_groups);
|
||
|
||
$this->access->connection->writeToCache($cacheKey, $ldap_groups);
|
||
return $ldap_groups;
|
||
}
|
||
|
||
/**
|
||
* get a list of all groups using a paged search
|
||
*
|
||
* @param string $search
|
||
* @param int $limit
|
||
* @param int $offset
|
||
* @return array with group names
|
||
*
|
||
* Returns a list with all groups
|
||
* Uses a paged search if available to override a
|
||
* server side search limit.
|
||
* (active directory has a limit of 1000 by default)
|
||
*/
|
||
public function getGroups($search = '', $limit = -1, $offset = 0) {
|
||
if(!$this->enabled) {
|
||
return array();
|
||
}
|
||
$search = $this->access->escapeFilterPart($search, true);
|
||
$pagingSize = $this->access->connection->ldapPagingSize;
|
||
if ((! $this->access->connection->hasPagedResultSupport)
|
||
|| empty($pagingSize)) {
|
||
return $this->getGroupsChunk($search, $limit, $offset);
|
||
}
|
||
$maxGroups = 100000; // limit max results (just for safety reasons)
|
||
if ($limit > -1) {
|
||
$overallLimit = min($limit + $offset, $maxGroups);
|
||
} else {
|
||
$overallLimit = $maxGroups;
|
||
}
|
||
$chunkOffset = $offset;
|
||
$allGroups = array();
|
||
while ($chunkOffset < $overallLimit) {
|
||
$chunkLimit = min($pagingSize, $overallLimit - $chunkOffset);
|
||
$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) {
|
||
$allGroups = array_merge($allGroups, $ldapGroups);
|
||
$chunkOffset += $nread;
|
||
}
|
||
if ($nread < $chunkLimit) {
|
||
break;
|
||
}
|
||
}
|
||
return $allGroups;
|
||
}
|
||
|
||
/**
|
||
* @param string $group
|
||
* @return bool
|
||
*/
|
||
public function groupMatchesFilter($group) {
|
||
return (strripos($group, $this->groupSearch) !== false);
|
||
}
|
||
|
||
/**
|
||
* check if a group exists
|
||
* @param string $gid
|
||
* @return bool
|
||
*/
|
||
public function groupExists($gid) {
|
||
if($this->access->connection->isCached('groupExists'.$gid)) {
|
||
return $this->access->connection->getFromCache('groupExists'.$gid);
|
||
}
|
||
|
||
//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
|
||
* @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)(OC_GROUP_BACKEND_COUNT_USERS & $actions);
|
||
}
|
||
}
|