nextcloud/apps/user_ldap/lib/Group_LDAP.php

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<?php
/**
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* @copyright Copyright (c) 2016, ownCloud, Inc.
*
* @author Alexander Bergolth <leo@strike.wu.ac.at>
* @author Alex Weirig <alex.weirig@technolink.lu>
* @author alexweirig <alex.weirig@technolink.lu>
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* @author Andreas Fischer <bantu@owncloud.com>
* @author Andreas Pflug <dev@admin4.org>
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* @author Arthur Schiwon <blizzz@arthur-schiwon.de>
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* @author Bart Visscher <bartv@thisnet.nl>
* @author Christoph Wurst <christoph@winzerhof-wurst.at>
* @author Clement Wong <git@clement.hk>
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* @author Frédéric Fortier <frederic.fortier@oronospolytechnique.com>
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* @author Joas Schilling <coding@schilljs.com>
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* @author Lukas Reschke <lukas@statuscode.ch>
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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 Roeland Jago Douma <roeland@famdouma.nl>
* @author Roland Tapken <roland@bitarbeiter.net>
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* @author Thomas Müller <thomas.mueller@tmit.eu>
* @author Tobias Perschon <tobias@perschon.at>
* @author Victor Dubiniuk <dubiniuk@owncloud.com>
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* @author Vincent Petry <pvince81@owncloud.com>
* @author Vinicius Cubas Brand <vinicius@eita.org.br>
* @author Xuanwo <xuanwo@yunify.com>
*
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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 Closure;
use Exception;
use OC;
use OC\Cache\CappedMemoryCache;
use OC\ServerNotAvailableException;
use OCP\Group\Backend\IGetDisplayNameBackend;
use OCP\GroupInterface;
use OCP\ILogger;
class Group_LDAP extends BackendUtility implements GroupInterface, IGroupLDAP, IGetDisplayNameBackend {
protected $enabled = false;
/** @var string[] $cachedGroupMembers array of users with gid as key */
protected $cachedGroupMembers;
/** @var string[] $cachedGroupsByMember array of groups with uid as key */
protected $cachedGroupsByMember;
/** @var string[] $cachedNestedGroups array of groups with gid (DN) as key */
protected $cachedNestedGroups;
/** @var GroupPluginManager */
protected $groupPluginManager;
/** @var ILogger */
protected $logger;
/**
* @var string $ldapGroupMemberAssocAttr contains the LDAP setting (in lower case) with the same name
*/
protected $ldapGroupMemberAssocAttr;
public function __construct(Access $access, GroupPluginManager $groupPluginManager) {
parent::__construct($access);
$filter = $this->access->connection->ldapGroupFilter;
$gAssoc = $this->access->connection->ldapGroupMemberAssocAttr;
if (!empty($filter) && !empty($gAssoc)) {
$this->enabled = true;
}
$this->cachedGroupMembers = new CappedMemoryCache();
$this->cachedGroupsByMember = new CappedMemoryCache();
$this->cachedNestedGroups = new CappedMemoryCache();
$this->groupPluginManager = $groupPluginManager;
$this->logger = OC::$server->getLogger();
$this->ldapGroupMemberAssocAttr = strtolower($gAssoc);
}
/**
* is user in group?
*
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* @param string $uid uid of the user
* @param string $gid gid of the group
* @return bool
* @throws Exception
* @throws ServerNotAvailableException
*/
public function inGroup($uid, $gid) {
if (!$this->enabled) {
return false;
}
$cacheKey = 'inGroup' . $uid . ':' . $gid;
$inGroup = $this->access->connection->getFromCache($cacheKey);
if (!is_null($inGroup)) {
return (bool)$inGroup;
}
$userDN = $this->access->username2dn($uid);
if (isset($this->cachedGroupMembers[$gid])) {
return in_array($userDN, $this->cachedGroupMembers[$gid]);
}
$cacheKeyMembers = 'inGroup-members:' . $gid;
$members = $this->access->connection->getFromCache($cacheKeyMembers);
if (!is_null($members)) {
$this->cachedGroupMembers[$gid] = $members;
$isInGroup = in_array($userDN, $members, true);
$this->access->connection->writeToCache($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);
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
switch ($this->ldapGroupMemberAssocAttr) {
case 'memberuid':
case 'zimbramailforwardingaddress':
$requestAttributes = $this->access->userManager->getAttributes(true);
$dns = [];
$filterParts = [];
$bytes = 0;
foreach ($members as $mid) {
if ($this->ldapGroupMemberAssocAttr === 'zimbramailforwardingaddress') {
$parts = explode('@', $mid); //making sure we get only the uid
$mid = $parts[0];
}
$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);
$users = $this->access->fetchListOfUsers($filter, $requestAttributes, count($filterParts));
$bytes = 0;
$filterParts = [];
$dns = array_merge($dns, $users);
}
}
if (count($filterParts) > 0) {
$filter = $this->access->combineFilterWithOr($filterParts);
$users = $this->access->fetchListOfUsers($filter, $requestAttributes, count($filterParts));
$dns = array_merge($dns, $users);
}
$members = $dns;
break;
}
$isInGroup = in_array($userDN, $members);
$this->access->connection->writeToCache($cacheKey, $isInGroup);
$this->access->connection->writeToCache($cacheKeyMembers, $members);
$this->cachedGroupMembers[$gid] = $members;
return $isInGroup;
}
/**
* For a group that has user membership defined by an LDAP search url
* attribute returns the users that match the search url otherwise returns
* an empty array.
*
* @throws ServerNotAvailableException
*/
public function getDynamicGroupMembers(string $dnGroup): array {
$dynamicGroupMemberURL = strtolower($this->access->connection->ldapDynamicGroupMemberURL);
if (empty($dynamicGroupMemberURL)) {
return [];
}
$dynamicMembers = [];
$memberURLs = $this->access->readAttribute(
$dnGroup,
$dynamicGroupMemberURL,
$this->access->connection->ldapGroupFilter
);
if ($memberURLs !== false) {
// this group has the 'memberURL' attribute so this is a dynamic group
// example 1: ldap:///cn=users,cn=accounts,dc=dcsubbase,dc=dcbase??one?(o=HeadOffice)
// example 2: ldap:///cn=users,cn=accounts,dc=dcsubbase,dc=dcbase??one?(&(o=HeadOffice)(uidNumber>=500))
$pos = strpos($memberURLs[0], '(');
if ($pos !== false) {
$memberUrlFilter = substr($memberURLs[0], $pos);
$foundMembers = $this->access->searchUsers($memberUrlFilter, 'dn');
$dynamicMembers = [];
foreach ($foundMembers as $value) {
$dynamicMembers[$value['dn'][0]] = 1;
}
} else {
$this->logger->debug('No search filter found on member url of group {dn}',
[
'app' => 'user_ldap',
'dn' => $dnGroup,
]
);
}
}
return $dynamicMembers;
}
/**
* @throws ServerNotAvailableException
*/
private function _groupMembers(string $dnGroup, ?array &$seen = null): array {
if ($seen === null) {
$seen = [];
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}
$allMembers = [];
if (array_key_exists($dnGroup, $seen)) {
return [];
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}
// used extensively in cron job, caching makes sense for nested groups
$cacheKey = '_groupMembers' . $dnGroup;
$groupMembers = $this->access->connection->getFromCache($cacheKey);
if ($groupMembers !== null) {
return $groupMembers;
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}
if ($this->access->connection->ldapNestedGroups
&& $this->access->connection->useMemberOfToDetectMembership
&& $this->access->connection->hasMemberOfFilterSupport
&& $this->access->connection->ldapMatchingRuleInChainState !== Configuration::LDAP_SERVER_FEATURE_UNAVAILABLE
) {
$attemptedLdapMatchingRuleInChain = true;
// compatibility hack with servers supporting :1.2.840.113556.1.4.1941:, and others)
$filter = $this->access->combineFilterWithAnd([$this->access->connection->ldapUserFilter, 'memberof:1.2.840.113556.1.4.1941:=' . $dnGroup]);
$memberRecords = $this->access->fetchListOfUsers(
$filter,
$this->access->userManager->getAttributes(true)
);
if (!empty($memberRecords)) {
if ($this->access->connection->ldapMatchingRuleInChainState === Configuration::LDAP_SERVER_FEATURE_UNKNOWN) {
$this->access->connection->ldapMatchingRuleInChainState = Configuration::LDAP_SERVER_FEATURE_AVAILABLE;
$this->access->connection->saveConfiguration();
}
return array_reduce($memberRecords, function ($carry, $record) {
$carry[] = $record['dn'][0];
return $carry;
}, []);
}
}
$seen[$dnGroup] = 1;
$members = $this->access->readAttribute($dnGroup, $this->access->connection->ldapGroupMemberAssocAttr);
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if (is_array($members)) {
$fetcher = function ($memberDN, &$seen) {
return $this->_groupMembers($memberDN, $seen);
};
$allMembers = $this->walkNestedGroups($dnGroup, $fetcher, $members);
}
$allMembers += $this->getDynamicGroupMembers($dnGroup);
$this->access->connection->writeToCache($cacheKey, $allMembers);
if (isset($attemptedLdapMatchingRuleInChain) && !empty($allMembers)) {
$this->access->connection->ldapMatchingRuleInChainState = Configuration::LDAP_SERVER_FEATURE_UNAVAILABLE;
$this->access->connection->saveConfiguration();
}
return $allMembers;
}
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/**
* @throws ServerNotAvailableException
*/
private function _getGroupDNsFromMemberOf(string $dn): array {
$groups = $this->access->readAttribute($dn, 'memberOf');
if (!is_array($groups)) {
return [];
}
$fetcher = function ($groupDN) {
if (isset($this->cachedNestedGroups[$groupDN])) {
$nestedGroups = $this->cachedNestedGroups[$groupDN];
} else {
$nestedGroups = $this->access->readAttribute($groupDN, 'memberOf');
if (!is_array($nestedGroups)) {
$nestedGroups = [];
}
$this->cachedNestedGroups[$groupDN] = $nestedGroups;
}
return $nestedGroups;
};
$groups = $this->walkNestedGroups($dn, $fetcher, $groups);
return $this->filterValidGroups($groups);
}
private function walkNestedGroups(string $dn, Closure $fetcher, array $list): array {
$nesting = (int)$this->access->connection->ldapNestedGroups;
// depending on the input, we either have a list of DNs or a list of LDAP records
// also, the output expects either DNs or records. Testing the first element should suffice.
$recordMode = is_array($list) && isset($list[0]) && is_array($list[0]) && isset($list[0]['dn'][0]);
if ($nesting !== 1) {
if ($recordMode) {
// the keys are numeric, but should hold the DN
return array_reduce($list, function ($transformed, $record) use ($dn) {
if ($record['dn'][0] != $dn) {
$transformed[$record['dn'][0]] = $record;
}
return $transformed;
}, []);
}
return $list;
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}
$seen = [];
while ($record = array_pop($list)) {
$recordDN = $recordMode ? $record['dn'][0] : $record;
if ($recordDN === $dn || array_key_exists($recordDN, $seen)) {
// Prevent loops
continue;
}
$fetched = $fetcher($record, $seen);
$list = array_merge($list, $fetched);
$seen[$recordDN] = $record;
}
return $recordMode ? $seen : array_keys($seen);
}
/**
* translates a gidNumber into an ownCloud internal name
*
* @return string|bool
* @throws Exception
* @throws ServerNotAvailableException
*/
public function gidNumber2Name(string $gid, string $dn) {
$cacheKey = 'gidNumberToName' . $gid;
$groupName = $this->access->connection->getFromCache($cacheKey);
if (!is_null($groupName) && isset($groupName)) {
return $groupName;
}
//we need to get the DN from LDAP
$filter = $this->access->combineFilterWithAnd([
$this->access->connection->ldapGroupFilter,
'objectClass=posixGroup',
$this->access->connection->ldapGidNumber . '=' . $gid
]);
return $this->getNameOfGroup($filter, $cacheKey) ?? false;
}
/**
* @throws ServerNotAvailableException
* @throws Exception
*/
private function getNameOfGroup(string $filter, string $cacheKey) {
$result = $this->access->searchGroups($filter, ['dn'], 1);
if (empty($result)) {
return null;
}
$dn = $result[0]['dn'][0];
//and now the group name
//NOTE once we have separate Nextcloud 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 gidNumber
*
* @return string|bool
* @throws ServerNotAvailableException
*/
private function getEntryGidNumber(string $dn, string $attribute) {
$value = $this->access->readAttribute($dn, $attribute);
if (is_array($value) && !empty($value)) {
return $value[0];
}
return false;
}
/**
* @return string|bool
* @throws ServerNotAvailableException
*/
public function getGroupGidNumber(string $dn) {
return $this->getEntryGidNumber($dn, 'gidNumber');
}
/**
* returns the user's gidNumber
*
* @return string|bool
* @throws ServerNotAvailableException
*/
public function getUserGidNumber(string $dn) {
$gidNumber = false;
if ($this->access->connection->hasGidNumber) {
$gidNumber = $this->getEntryGidNumber($dn, $this->access->connection->ldapGidNumber);
if ($gidNumber === false) {
$this->access->connection->hasGidNumber = false;
}
}
return $gidNumber;
}
/**
* @throws ServerNotAvailableException
* @throws Exception
*/
private function prepareFilterForUsersHasGidNumber(string $groupDN, string $search = ''): string {
$groupID = $this->getGroupGidNumber($groupDN);
if ($groupID === false) {
throw new Exception('Not a valid group');
}
$filterParts = [];
$filterParts[] = $this->access->getFilterForUserCount();
if ($search !== '') {
$filterParts[] = $this->access->getFilterPartForUserSearch($search);
}
$filterParts[] = $this->access->connection->ldapGidNumber . '=' . $groupID;
return $this->access->combineFilterWithAnd($filterParts);
}
/**
* returns a list of users that have the given group as gid number
*
* @throws ServerNotAvailableException
*/
public function getUsersInGidNumber(
string $groupDN,
string $search = '',
?int $limit = -1,
?int $offset = 0
): array {
try {
$filter = $this->prepareFilterForUsersHasGidNumber($groupDN, $search);
$users = $this->access->fetchListOfUsers(
$filter,
[$this->access->connection->ldapUserDisplayName, 'dn'],
$limit,
$offset
);
return $this->access->nextcloudUserNames($users);
} catch (ServerNotAvailableException $e) {
throw $e;
} catch (Exception $e) {
return [];
}
}
/**
* @throws ServerNotAvailableException
* @return bool
*/
public function getUserGroupByGid(string $dn) {
$groupID = $this->getUserGidNumber($dn);
if ($groupID !== false) {
$groupName = $this->gidNumber2Name($groupID, $dn);
if ($groupName !== false) {
return $groupName;
}
}
return false;
}
/**
* translates a primary group ID into an Nextcloud internal name
*
* @return string|bool
* @throws Exception
* @throws ServerNotAvailableException
*/
public function primaryGroupID2Name(string $gid, string $dn) {
$cacheKey = 'primaryGroupIDtoName';
$groupNames = $this->access->connection->getFromCache($cacheKey);
if (!is_null($groupNames) && isset($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([
$this->access->connection->ldapGroupFilter,
'objectsid=' . $domainObjectSid . '-' . $gid
]);
return $this->getNameOfGroup($filter, $cacheKey) ?? false;
}
/**
* returns the entry's primary group ID
*
* @return string|bool
* @throws ServerNotAvailableException
*/
private function getEntryGroupID(string $dn, string $attribute) {
$value = $this->access->readAttribute($dn, $attribute);
if (is_array($value) && !empty($value)) {
return $value[0];
}
return false;
}
/**
* @return string|bool
* @throws ServerNotAvailableException
*/
public function getGroupPrimaryGroupID(string $dn) {
return $this->getEntryGroupID($dn, 'primaryGroupToken');
}
/**
* @return string|bool
* @throws ServerNotAvailableException
*/
public function getUserPrimaryGroupIDs(string $dn) {
$primaryGroupID = false;
if ($this->access->connection->hasPrimaryGroups) {
$primaryGroupID = $this->getEntryGroupID($dn, 'primaryGroupID');
if ($primaryGroupID === false) {
$this->access->connection->hasPrimaryGroups = false;
}
}
return $primaryGroupID;
}
/**
* @throws Exception
* @throws ServerNotAvailableException
*/
private function prepareFilterForUsersInPrimaryGroup(string $groupDN, string $search = ''): string {
$groupID = $this->getGroupPrimaryGroupID($groupDN);
if ($groupID === false) {
throw new Exception('Not a valid group');
}
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$filterParts = [];
$filterParts[] = $this->access->getFilterForUserCount();
if ($search !== '') {
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$filterParts[] = $this->access->getFilterPartForUserSearch($search);
}
$filterParts[] = 'primaryGroupID=' . $groupID;
return $this->access->combineFilterWithAnd($filterParts);
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}
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/**
* @throws ServerNotAvailableException
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*/
public function getUsersInPrimaryGroup(
string $groupDN,
string $search = '',
?int $limit = -1,
?int $offset = 0
): array {
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try {
$filter = $this->prepareFilterForUsersInPrimaryGroup($groupDN, $search);
$users = $this->access->fetchListOfUsers(
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$filter,
[$this->access->connection->ldapUserDisplayName, 'dn'],
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$limit,
$offset
);
return $this->access->nextcloudUserNames($users);
} catch (ServerNotAvailableException $e) {
throw $e;
} catch (Exception $e) {
return [];
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}
}
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/**
* @throws ServerNotAvailableException
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*/
public function countUsersInPrimaryGroup(
string $groupDN,
string $search = '',
int $limit = -1,
int $offset = 0
): int {
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try {
$filter = $this->prepareFilterForUsersInPrimaryGroup($groupDN, $search);
$users = $this->access->countUsers($filter, ['dn'], $limit, $offset);
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return (int)$users;
} catch (ServerNotAvailableException $e) {
throw $e;
} catch (Exception $e) {
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return 0;
}
}
/**
* @return string|bool
* @throws ServerNotAvailableException
*/
public function getUserPrimaryGroup(string $dn) {
$groupID = $this->getUserPrimaryGroupIDs($dn);
if ($groupID !== false) {
$groupName = $this->primaryGroupID2Name($groupID, $dn);
if ($groupName !== false) {
return $groupName;
}
}
return false;
}
/**
* This function fetches all groups a user belongs to. It does not check
* if the user exists at all.
*
* This function includes groups based on dynamic group membership.
*
* @param string $uid Name of the user
* @return array with group names
* @throws Exception
* @throws ServerNotAvailableException
*/
public function getUserGroups($uid) {
if (!$this->enabled) {
return [];
}
$cacheKey = 'getUserGroups' . $uid;
$userGroups = $this->access->connection->getFromCache($cacheKey);
if (!is_null($userGroups)) {
return $userGroups;
}
$userDN = $this->access->username2dn($uid);
if (!$userDN) {
$this->access->connection->writeToCache($cacheKey, []);
return [];
}
$groups = [];
$primaryGroup = $this->getUserPrimaryGroup($userDN);
$gidGroupName = $this->getUserGroupByGid($userDN);
$dynamicGroupMemberURL = strtolower($this->access->connection->ldapDynamicGroupMemberURL);
if (!empty($dynamicGroupMemberURL)) {
// look through dynamic groups to add them to the result array if needed
$groupsToMatch = $this->access->fetchListOfGroups(
$this->access->connection->ldapGroupFilter, ['dn', $dynamicGroupMemberURL]);
foreach ($groupsToMatch as $dynamicGroup) {
if (!array_key_exists($dynamicGroupMemberURL, $dynamicGroup)) {
continue;
}
$pos = strpos($dynamicGroup[$dynamicGroupMemberURL][0], '(');
if ($pos !== false) {
$memberUrlFilter = substr($dynamicGroup[$dynamicGroupMemberURL][0], $pos);
// apply filter via ldap search to see if this user is in this
// dynamic group
$userMatch = $this->access->readAttribute(
$userDN,
$this->access->connection->ldapUserDisplayName,
$memberUrlFilter
);
if ($userMatch !== false) {
// match found so this user is in this group
$groupName = $this->access->dn2groupname($dynamicGroup['dn'][0]);
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;
}
}
} else {
$this->logger->debug('No search filter found on member url of group {dn}',
[
'app' => 'user_ldap',
'dn' => $dynamicGroup,
]
);
}
}
}
// if possible, read out membership via memberOf. It's far faster than
// performing a search, which still is a fallback later.
// memberof doesn't support memberuid, so skip it here.
if ((int)$this->access->connection->hasMemberOfFilterSupport === 1
&& (int)$this->access->connection->useMemberOfToDetectMembership === 1
&& $this->ldapGroupMemberAssocAttr !== 'memberuid'
&& $this->ldapGroupMemberAssocAttr !== 'zimbramailforwardingaddress') {
$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[] = $primaryGroup;
}
if ($gidGroupName !== false) {
$groups[] = $gidGroupName;
}
$this->access->connection->writeToCache($cacheKey, $groups);
return $groups;
}
//uniqueMember takes DN, memberuid the uid, so we need to distinguish
switch ($this->ldapGroupMemberAssocAttr) {
case 'uniquemember':
case 'member':
$uid = $userDN;
break;
case 'memberuid':
case 'zimbramailforwardingaddress':
$result = $this->access->readAttribute($userDN, 'uid');
if ($result === false) {
$this->logger->debug('No uid attribute found for DN {dn} on {host}',
[
'app' => 'user_ldap',
'dn' => $userDN,
'host' => $this->access->connection->ldapHost,
]
);
$uid = false;
} else {
$uid = $result[0];
}
break;
default:
// just in case
$uid = $userDN;
break;
}
if ($uid !== false) {
if (isset($this->cachedGroupsByMember[$uid])) {
$groups = array_merge($groups, $this->cachedGroupsByMember[$uid]);
} else {
$groupsByMember = array_values($this->getGroupsByMember($uid));
$groupsByMember = $this->access->nextcloudGroupNames($groupsByMember);
$this->cachedGroupsByMember[$uid] = $groupsByMember;
$groups = array_merge($groups, $groupsByMember);
}
}
if ($primaryGroup !== false) {
$groups[] = $primaryGroup;
}
if ($gidGroupName !== false) {
$groups[] = $gidGroupName;
}
$groups = array_unique($groups, SORT_LOCALE_STRING);
$this->access->connection->writeToCache($cacheKey, $groups);
return $groups;
}
/**
* @throws ServerNotAvailableException
*/
private function getGroupsByMember(string $dn, array &$seen = null): array {
if ($seen === null) {
$seen = [];
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}
if (array_key_exists($dn, $seen)) {
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// avoid loops
return [];
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}
$allGroups = [];
$seen[$dn] = true;
$filter = $this->access->connection->ldapGroupMemberAssocAttr . '=' . $dn;
if ($this->ldapGroupMemberAssocAttr === 'zimbramailforwardingaddress') {
//in this case the member entries are email addresses
$filter .= '@*';
}
$groups = $this->access->fetchListOfGroups($filter,
[strtolower($this->access->connection->ldapGroupMemberAssocAttr), $this->access->connection->ldapGroupDisplayName, 'dn']);
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if (is_array($groups)) {
$fetcher = function ($dn, &$seen) {
if (is_array($dn) && isset($dn['dn'][0])) {
$dn = $dn['dn'][0];
}
return $this->getGroupsByMember($dn, $seen);
};
if (empty($dn)) {
$dn = "";
}
$allGroups = $this->walkNestedGroups($dn, $fetcher, $groups);
}
$visibleGroups = $this->filterValidGroups($allGroups);
return array_intersect_key($allGroups, $visibleGroups);
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}
/**
* get a list of all users in a group
*
* @param string $gid
* @param string $search
* @param int $limit
* @param int $offset
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* @return array with user ids
* @throws Exception
* @throws ServerNotAvailableException
*/
public function usersInGroup($gid, $search = '', $limit = -1, $offset = 0) {
if (!$this->enabled) {
return [];
}
if (!$this->groupExists($gid)) {
return [];
}
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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 $groupUsers;
}
if ($limit === -1) {
$limit = null;
}
// 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;
}
$groupDN = $this->access->groupname2dn($gid);
if (!$groupDN) {
// group couldn't be found, return empty resultset
$this->access->connection->writeToCache($cacheKey, []);
return [];
}
$primaryUsers = $this->getUsersInPrimaryGroup($groupDN, $search, $limit, $offset);
$posixGroupUsers = $this->getUsersInGidNumber($groupDN, $search, $limit, $offset);
$members = $this->_groupMembers($groupDN);
if (!$members && empty($posixGroupUsers) && empty($primaryUsers)) {
//in case users could not be retrieved, return empty result set
$this->access->connection->writeToCache($cacheKey, []);
return [];
}
$groupUsers = [];
$attrs = $this->access->userManager->getAttributes(true);
foreach ($members as $member) {
switch ($this->ldapGroupMemberAssocAttr) {
case 'zimbramailforwardingaddress':
//we get email addresses and need to convert them to uids
$parts = explode('@', $member);
$member = $parts[0];
//no break needed because we just needed to remove the email part and now we have uids
case 'memberuid':
//we got uids, need to get their DNs to 'translate' them to user names
$filter = $this->access->combineFilterWithAnd([
str_replace('%uid', trim($member), $this->access->connection->ldapLoginFilter),
$this->access->combineFilterWithAnd([
$this->access->getFilterPartForUserSearch($search),
$this->access->connection->ldapUserFilter
])
]);
$ldap_users = $this->access->fetchListOfUsers($filter, $attrs, 1);
if (empty($ldap_users)) {
break;
}
$groupUsers[] = $this->access->dn2username($ldap_users[0]['dn'][0]);
break;
default:
//we got DNs, check if we need to filter by search or we can give back all of them
$uid = $this->access->dn2username($member);
if (!$uid) {
break;
}
$cacheKey = 'userExistsOnLDAP' . $uid;
$userExists = $this->access->connection->getFromCache($cacheKey);
if ($userExists === false) {
break;
}
if ($userExists === null || $search !== '') {
if (!$this->access->readAttribute($member,
$this->access->connection->ldapUserDisplayName,
$this->access->combineFilterWithAnd([
$this->access->getFilterPartForUserSearch($search),
$this->access->connection->ldapUserFilter
]))) {
if ($search === '') {
$this->access->connection->writeToCache($cacheKey, false);
}
break;
}
$this->access->connection->writeToCache($cacheKey, true);
}
$groupUsers[] = $uid;
break;
}
}
$groupUsers = array_unique(array_merge($groupUsers, $primaryUsers, $posixGroupUsers));
natsort($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 $search optional, a search string
* @return int|bool
* @throws Exception
* @throws ServerNotAvailableException
*/
public function countUsersInGroup($gid, $search = '') {
if ($this->groupPluginManager->implementsActions(GroupInterface::COUNT_USERS)) {
return $this->groupPluginManager->countUsersInGroup($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 = $this->_groupMembers($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 ($search === '') {
$groupUsers = count($members) + $primaryUserCount;
$this->access->connection->writeToCache($cacheKey, $groupUsers);
return $groupUsers;
}
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$search = $this->access->escapeFilterPart($search, true);
$isMemberUid =
($this->ldapGroupMemberAssocAttr === 'memberuid' ||
$this->ldapGroupMemberAssocAttr === 'zimbramailforwardingaddress');
//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
$groupUsers = [];
foreach ($members as $member) {
if ($isMemberUid) {
if ($this->ldapGroupMemberAssocAttr === 'zimbramailforwardingaddress') {
//we get email addresses and need to convert them to uids
$parts = explode('@', $member);
$member = $parts[0];
}
//we got uids, need to get their DNs to 'translate' them to user names
$filter = $this->access->combineFilterWithAnd([
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 ($ncGroupId = $this->access->dn2username($member)) {
$groupUsers[] = $ncGroupId;
}
}
}
//and get users that have the group as primary
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$primaryUsers = $this->countUsersInPrimaryGroup($groupDN, $search);
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return count($groupUsers) + $primaryUsers;
}
/**
* get a list of all groups using a paged search
*
* @param string $search
* @param int $limit
* @param int $offset
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* @return array with group names
*
* Returns a list with all groups
* Uses a paged search if available to override a
* server side search limit.
* (active directory has a limit of 1000 by default)
* @throws Exception
*/
public function getGroups($search = '', $limit = -1, $offset = 0) {
if (!$this->enabled) {
return [];
}
$cacheKey = 'getGroups-' . $search . '-' . $limit . '-' . $offset;
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//Check cache before driving unnecessary searches
$ldap_groups = $this->access->connection->getFromCache($cacheKey);
if (!is_null($ldap_groups)) {
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return $ldap_groups;
}
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// if we'd pass -1 to LDAP search, we'd end up in a Protocol
// error. With a limit of 0, we get 0 results. So we pass null.
if ($limit <= 0) {
$limit = null;
}
$filter = $this->access->combineFilterWithAnd([
$this->access->connection->ldapGroupFilter,
$this->access->getFilterPartForGroupSearch($search)
]);
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$ldap_groups = $this->access->fetchListOfGroups($filter,
[$this->access->connection->ldapGroupDisplayName, 'dn'],
$limit,
$offset);
$ldap_groups = $this->access->nextcloudGroupNames($ldap_groups);
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$this->access->connection->writeToCache($cacheKey, $ldap_groups);
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return $ldap_groups;
}
/**
* check if a group exists
*
* @param string $gid
* @return bool
* @throws ServerNotAvailableException
*/
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public function groupExists($gid) {
$groupExists = $this->access->connection->getFromCache('groupExists' . $gid);
if (!is_null($groupExists)) {
return (bool)$groupExists;
}
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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' . $gid, false);
return false;
}
if (!$this->access->isDNPartOfBase($dn, $this->access->connection->ldapBaseGroups)) {
$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->ldapGroupFilter))) {
$this->access->connection->writeToCache('groupExists' . $gid, false);
return false;
}
$this->access->connection->writeToCache('groupExists' . $gid, true);
return true;
}
/**
* @throws ServerNotAvailableException
* @throws Exception
*/
protected function filterValidGroups(array $listOfGroups): array {
$validGroupDNs = [];
foreach ($listOfGroups as $key => $item) {
$dn = is_string($item) ? $item : $item['dn'][0];
$gid = $this->access->dn2groupname($dn);
if (!$gid) {
continue;
}
if ($this->groupExists($gid)) {
$validGroupDNs[$key] = $item;
}
}
return $validGroupDNs;
}
/**
* Check if backend implements actions
*
* @param int $actions bitwise-or'ed actions
* @return boolean
*
* Returns the supported actions as int to be
* compared with GroupInterface::CREATE_GROUP etc.
*/
public function implementsActions($actions) {
return (bool)((GroupInterface::COUNT_USERS |
$this->groupPluginManager->getImplementedActions()) & $actions);
}
/**
* Return access for LDAP interaction.
*
* @return Access instance of Access for LDAP interaction
*/
public function getLDAPAccess($gid) {
return $this->access;
}
/**
* create a group
*
* @param string $gid
* @return bool
* @throws Exception
* @throws ServerNotAvailableException
*/
public function createGroup($gid) {
if ($this->groupPluginManager->implementsActions(GroupInterface::CREATE_GROUP)) {
if ($dn = $this->groupPluginManager->createGroup($gid)) {
//updates group mapping
$uuid = $this->access->getUUID($dn, false);
if (is_string($uuid)) {
$this->access->mapAndAnnounceIfApplicable(
$this->access->getGroupMapper(),
$dn,
$gid,
$uuid,
false
);
$this->access->cacheGroupExists($gid);
}
}
return $dn != null;
}
throw new Exception('Could not create group in LDAP backend.');
}
/**
* delete a group
*
* @param string $gid gid of the group to delete
* @return bool
* @throws Exception
*/
public function deleteGroup($gid) {
if ($this->groupPluginManager->implementsActions(GroupInterface::DELETE_GROUP)) {
if ($ret = $this->groupPluginManager->deleteGroup($gid)) {
#delete group in nextcloud internal db
$this->access->getGroupMapper()->unmap($gid);
$this->access->connection->writeToCache("groupExists" . $gid, false);
}
return $ret;
}
throw new Exception('Could not delete group in LDAP backend.');
}
/**
* Add a user to a group
*
* @param string $uid Name of the user to add to group
* @param string $gid Name of the group in which add the user
* @return bool
* @throws Exception
*/
public function addToGroup($uid, $gid) {
if ($this->groupPluginManager->implementsActions(GroupInterface::ADD_TO_GROUP)) {
if ($ret = $this->groupPluginManager->addToGroup($uid, $gid)) {
$this->access->connection->clearCache();
unset($this->cachedGroupMembers[$gid]);
}
return $ret;
}
throw new Exception('Could not add user to group in LDAP backend.');
}
/**
* Removes a user from a group
*
* @param string $uid Name of the user to remove from group
* @param string $gid Name of the group from which remove the user
* @return bool
* @throws Exception
*/
public function removeFromGroup($uid, $gid) {
if ($this->groupPluginManager->implementsActions(GroupInterface::REMOVE_FROM_GROUP)) {
if ($ret = $this->groupPluginManager->removeFromGroup($uid, $gid)) {
$this->access->connection->clearCache();
unset($this->cachedGroupMembers[$gid]);
}
return $ret;
}
throw new Exception('Could not remove user from group in LDAP backend.');
}
/**
* Gets group details
*
* @param string $gid Name of the group
* @return array|false
* @throws Exception
*/
public function getGroupDetails($gid) {
if ($this->groupPluginManager->implementsActions(GroupInterface::GROUP_DETAILS)) {
return $this->groupPluginManager->getGroupDetails($gid);
}
throw new Exception('Could not get group details in LDAP backend.');
}
/**
* Return LDAP connection resource from a cloned connection.
* The cloned connection needs to be closed manually.
* of the current access.
*
* @param string $gid
* @return resource of the LDAP connection
* @throws ServerNotAvailableException
*/
public function getNewLDAPConnection($gid) {
$connection = clone $this->access->getConnection();
return $connection->getConnectionResource();
}
/**
* @throws ServerNotAvailableException
*/
public function getDisplayName(string $gid): string {
if ($this->groupPluginManager instanceof IGetDisplayNameBackend) {
return $this->groupPluginManager->getDisplayName($gid);
}
$cacheKey = 'group_getDisplayName' . $gid;
if (!is_null($displayName = $this->access->connection->getFromCache($cacheKey))) {
return $displayName;
}
$displayName = $this->access->readAttribute(
$this->access->groupname2dn($gid),
$this->access->connection->ldapGroupDisplayName);
if ($displayName && (count($displayName) > 0)) {
$displayName = $displayName[0];
$this->access->connection->writeToCache($cacheKey, $displayName);
return $displayName;
}
return '';
}
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}