nextcloud/apps/user_ldap/lib/access.php

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<?php
/**
* ownCloud LDAP Access
*
* @author Arthur Schiwon
* @copyright 2012 Arthur Schiwon blizzz@owncloud.com
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
* License as published by the Free Software Foundation; either
* version 3 of the License, or any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU AFFERO GENERAL PUBLIC LICENSE for more details.
*
* You should have received a copy of the GNU Affero General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*
*/
namespace OCA\user_ldap\lib;
abstract class Access {
protected $connection;
//never ever check this var directly, always use getPagedSearchResultState
protected $pagedSearchedSuccessful;
public function setConnector(Connection &$connection) {
$this->connection = $connection;
}
private function checkConnection() {
return ($this->connection instanceof Connection);
}
/**
* @brief reads a given attribute for an LDAP record identified by a DN
* @param $dn the record in question
* @param $attr the attribute that shall be retrieved
* @returns the values in an array on success, false otherwise
*
* Reads an attribute from an LDAP entry
*/
public function readAttribute($dn, $attr, $filter = 'objectClass=*') {
if(!$this->checkConnection()) {
\OCP\Util::writeLog('user_ldap', 'No LDAP Connector assigned, access impossible for readAttribute.', \OCP\Util::WARN);
return false;
}
$cr = $this->connection->getConnectionResource();
if(!is_resource($cr)) {
//LDAP not available
\OCP\Util::writeLog('user_ldap', 'LDAP resource not available.', \OCP\Util::DEBUG);
return false;
}
$rr = @ldap_read($cr, $dn, $filter, array($attr));
if(!is_resource($rr)) {
\OCP\Util::writeLog('user_ldap', 'readAttribute '.$attr.' failed for DN '.$dn, \OCP\Util::DEBUG);
//in case an error occurs , e.g. object does not exist
return false;
}
$er = ldap_first_entry($cr, $rr);
if(!is_resource($er)) {
//did not match the filter, return false
return false;
}
//LDAP attributes are not case sensitive
$result = \OCP\Util::mb_array_change_key_case(ldap_get_attributes($cr, $er), MB_CASE_LOWER, 'UTF-8');
$attr = mb_strtolower($attr, 'UTF-8');
if(isset($result[$attr]) && $result[$attr]['count'] > 0) {
$values = array();
for($i=0;$i<$result[$attr]['count'];$i++) {
$values[] = $this->resemblesDN($attr) ? $this->sanitizeDN($result[$attr][$i]) : $result[$attr][$i];
}
return $values;
}
\OCP\Util::writeLog('user_ldap', 'Requested attribute '.$attr.' not found for '.$dn, \OCP\Util::DEBUG);
return false;
}
/**
* @brief checks wether the given attribute`s valua is probably a DN
* @param $attr the attribute in question
* @return if so true, otherwise false
*/
private function resemblesDN($attr) {
$resemblingAttributes = array(
'dn',
'uniquemember',
'member'
);
return in_array($attr, $resemblingAttributes);
}
/**
* @brief sanitizes a DN received from the LDAP server
* @param $dn the DN in question
* @return the sanitized DN
*/
private function sanitizeDN($dn) {
//OID sometimes gives back DNs with whitespace after the comma a la "uid=foo, cn=bar, dn=..." We need to tackle this!
$dn = preg_replace('/([^\\\]),(\s+)/u', '\1,', $dn);
//make comparisons and everything work
$dn = mb_strtolower($dn, 'UTF-8');
return $dn;
}
/**
* gives back the database table for the query
*/
private function getMapTable($isUser) {
if($isUser) {
return '*PREFIX*ldap_user_mapping';
} else {
return '*PREFIX*ldap_group_mapping';
}
}
/**
* @brief returns the LDAP DN for the given internal ownCloud name of the group
* @param $name the ownCloud name in question
* @returns string with the LDAP DN on success, otherwise false
*
* returns the LDAP DN for the given internal ownCloud name of the group
*/
public function groupname2dn($name) {
$dn = $this->ocname2dn($name, false);
if($dn) {
return $dn;
}
return false;
}
/**
* @brief returns the LDAP DN for the given internal ownCloud name of the user
* @param $name the ownCloud name in question
* @returns string with the LDAP DN on success, otherwise false
*
* returns the LDAP DN for the given internal ownCloud name of the user
*/
public function username2dn($name) {
$dn = $this->ocname2dn($name, true);
if($dn) {
return $dn;
}
return false;
}
/**
* @brief returns the LDAP DN for the given internal ownCloud name
* @param $name the ownCloud name in question
* @param $isUser is it a user? otherwise group
* @returns string with the LDAP DN on success, otherwise false
*
* returns the LDAP DN for the given internal ownCloud name
*/
private function ocname2dn($name, $isUser) {
$table = $this->getMapTable($isUser);
$query = \OCP\DB::prepare('
SELECT `ldap_dn`
FROM `'.$table.'`
WHERE `owncloud_name` = ?
');
$record = $query->execute(array($name))->fetchOne();
return $record;
}
/**
* @brief returns the internal ownCloud name for the given LDAP DN of the group
* @param $dn the dn of the group object
* @param $ldapname optional, the display name of the object
* @returns string with with the name to use in ownCloud, false on DN outside of search DN
*
* returns the internal ownCloud name for the given LDAP DN of the group, false on DN outside of search DN or failure
*/
public function dn2groupname($dn, $ldapname = null) {
if(mb_strripos($dn, $this->sanitizeDN($this->connection->ldapBaseGroups), 0, 'UTF-8') !== (mb_strlen($dn, 'UTF-8')-mb_strlen($this->sanitizeDN($this->connection->ldapBaseGroups), 'UTF-8'))) {
return false;
}
return $this->dn2ocname($dn, $ldapname, false);
}
/**
* @brief returns the internal ownCloud name for the given LDAP DN of the user
* @param $dn the dn of the user object
* @param $ldapname optional, the display name of the object
* @returns string with with the name to use in ownCloud
*
* returns the internal ownCloud name for the given LDAP DN of the user, false on DN outside of search DN or failure
*/
public function dn2username($dn, $ldapname = null) {
if(mb_strripos($dn, $this->sanitizeDN($this->connection->ldapBaseUsers), 0, 'UTF-8') !== (mb_strlen($dn, 'UTF-8')-mb_strlen($this->sanitizeDN($this->connection->ldapBaseUsers), 'UTF-8'))) {
return false;
}
return $this->dn2ocname($dn, $ldapname, true);
}
/**
* @brief returns an internal ownCloud name for the given LDAP DN
* @param $dn the dn of the user object
* @param $ldapname optional, the display name of the object
* @param $isUser optional, wether it is a user object (otherwise group assumed)
* @returns string with with the name to use in ownCloud
*
* returns the internal ownCloud name for the given LDAP DN of the user, false on DN outside of search DN
*/
public function dn2ocname($dn, $ldapname = null, $isUser = true) {
$dn = $this->sanitizeDN($dn);
$table = $this->getMapTable($isUser);
if($isUser) {
$fncFindMappedName = 'findMappedUser';
$nameAttribute = $this->connection->ldapUserDisplayName;
} else {
$fncFindMappedName = 'findMappedGroup';
$nameAttribute = $this->connection->ldapGroupDisplayName;
}
//let's try to retrieve the ownCloud name from the mappings table
$ocname = $this->$fncFindMappedName($dn);
if($ocname) {
return $ocname;
}
//second try: get the UUID and check if it is known. Then, update the DN and return the name.
$uuid = $this->getUUID($dn);
if($uuid) {
$query = \OCP\DB::prepare('
SELECT `owncloud_name`
FROM `'.$table.'`
WHERE `directory_uuid` = ?
');
$component = $query->execute(array($uuid))->fetchOne();
if($component) {
$query = \OCP\DB::prepare('
UPDATE `'.$table.'`
SET `ldap_dn` = ?
WHERE `directory_uuid` = ?
');
$query->execute(array($dn, $uuid));
return $component;
}
}
if(is_null($ldapname)) {
$ldapname = $this->readAttribute($dn, $nameAttribute);
if(!isset($ldapname[0]) && empty($ldapname[0])) {
\OCP\Util::writeLog('user_ldap', 'No or empty name for '.$dn.'.', \OCP\Util::INFO);
return false;
}
$ldapname = $ldapname[0];
}
$ldapname = $this->sanitizeUsername($ldapname);
//a new user/group! Then let's try to add it. We're shooting into the blue with the user/group name, assuming that in most cases there will not be a conflict. Otherwise an error will occur and we will continue with our second shot.
if(($isUser && !\OCP\User::userExists($ldapname)) || (!$isUser && !\OC_Group::groupExists($ldapname))) {
if($this->mapComponent($dn, $ldapname, $isUser)) {
return $ldapname;
}
}
//doh! There is a conflict. We need to distinguish between users/groups. Adding indexes is an idea, but not much of a help for the user. The DN is ugly, but for now the only reasonable way. But we transform it to a readable format and remove the first part to only give the path where this object is located.
$oc_name = $this->alternateOwnCloudName($ldapname, $dn);
if(($isUser && !\OCP\User::userExists($oc_name)) || (!$isUser && !\OC_Group::groupExists($oc_name))) {
if($this->mapComponent($dn, $oc_name, $isUser)) {
return $oc_name;
}
}
//if everything else did not help..
\OCP\Util::writeLog('user_ldap', 'Could not create unique ownCloud name for '.$dn.'.', \OCP\Util::INFO);
return false;
}
/**
* @brief gives back the user names as they are used ownClod internally
* @param $ldapGroups an array with the ldap Users result in style of array ( array ('dn' => foo, 'uid' => bar), ... )
* @returns an array with the user names to use in ownCloud
*
* gives back the user names as they are used ownClod internally
*/
public function ownCloudUserNames($ldapUsers) {
return $this->ldap2ownCloudNames($ldapUsers, true);
}
/**
* @brief gives back the group names as they are used ownClod internally
* @param $ldapGroups an array with the ldap Groups result in style of array ( array ('dn' => foo, 'cn' => bar), ... )
* @returns an array with the group names to use in ownCloud
*
* gives back the group names as they are used ownClod internally
*/
public function ownCloudGroupNames($ldapGroups) {
return $this->ldap2ownCloudNames($ldapGroups, false);
}
private function findMappedUser($dn) {
static $query = null;
if(is_null($query)) {
$query = \OCP\DB::prepare('
SELECT `owncloud_name`
FROM `'.$this->getMapTable(true).'`
WHERE `ldap_dn` = ?'
);
}
$res = $query->execute(array($dn))->fetchOne();
if($res) {
return $res;
}
return false;
}
private function findMappedGroup($dn) {
static $query = null;
if(is_null($query)) {
$query = \OCP\DB::prepare('
SELECT `owncloud_name`
FROM `'.$this->getMapTable(false).'`
WHERE `ldap_dn` = ?'
);
}
$res = $query->execute(array($dn))->fetchOne();
if($res) {
return $res;
}
return false;
}
private function ldap2ownCloudNames($ldapObjects, $isUsers) {
if($isUsers) {
$nameAttribute = $this->connection->ldapUserDisplayName;
} else {
$nameAttribute = $this->connection->ldapGroupDisplayName;
}
$ownCloudNames = array();
foreach($ldapObjects as $ldapObject) {
$nameByLDAP = isset($ldapObject[$nameAttribute]) ? $ldapObject[$nameAttribute] : null;
$ocname = $this->dn2ocname($ldapObject['dn'], $nameByLDAP, $isUsers);
if($ocname) {
$ownCloudNames[] = $ocname;
}
continue;
}
return $ownCloudNames;
}
/**
* @brief creates a hopefully unique name for owncloud based on the display name and the dn of the LDAP object
* @param $name the display name of the object
* @param $dn the dn of the object
* @returns string with with the name to use in ownCloud
*
* creates a hopefully unique name for owncloud based on the display name and the dn of the LDAP object
*/
private function alternateOwnCloudName($name, $dn) {
$ufn = ldap_dn2ufn($dn);
$name = $name . '@' . trim(\OCP\Util::mb_substr_replace($ufn, '', 0, mb_strpos($ufn, ',', 0, 'UTF-8'), 'UTF-8'));
$name = $this->sanitizeUsername($name);
return $name;
}
/**
* @brief retrieves all known groups from the mappings table
* @returns array with the results
*
* retrieves all known groups from the mappings table
*/
private function mappedGroups() {
return $this->mappedComponents(false);
}
/**
* @brief retrieves all known users from the mappings table
* @returns array with the results
*
* retrieves all known users from the mappings table
*/
private function mappedUsers() {
return $this->mappedComponents(true);
}
private function mappedComponents($isUsers) {
$table = $this->getMapTable($isUsers);
$query = \OCP\DB::prepare('
SELECT `ldap_dn`, `owncloud_name`
FROM `'. $table . '`'
);
return $query->execute()->fetchAll();
}
/**
* @brief inserts a new user or group into the mappings table
* @param $dn the record in question
* @param $ocname the name to use in ownCloud
* @param $isUser is it a user or a group?
* @returns true on success, false otherwise
*
* inserts a new user or group into the mappings table
*/
private function mapComponent($dn, $ocname, $isUser = true) {
$table = $this->getMapTable($isUser);
$dn = $this->sanitizeDN($dn);
$sqlAdjustment = '';
$dbtype = \OCP\Config::getSystemValue('dbtype');
if($dbtype == 'mysql') {
$sqlAdjustment = 'FROM DUAL';
}
$insert = \OCP\DB::prepare('
INSERT INTO `'.$table.'` (`ldap_dn`, `owncloud_name`, `directory_uuid`)
SELECT ?,?,?
'.$sqlAdjustment.'
WHERE NOT EXISTS (
SELECT 1
FROM `'.$table.'`
WHERE `ldap_dn` = ?
OR `owncloud_name` = ?)
');
//feed the DB
$res = $insert->execute(array($dn, $ocname, $this->getUUID($dn), $dn, $ocname));
if(\OCP\DB::isError($res)) {
return false;
}
$insRows = $res->numRows();
if($insRows == 0) {
return false;
}
return true;
}
public function fetchListOfUsers($filter, $attr, $limit = null, $offset = null) {
return $this->fetchList($this->searchUsers($filter, $attr, $limit, $offset), (count($attr) > 1));
}
public function fetchListOfGroups($filter, $attr, $limit = null, $offset = null) {
return $this->fetchList($this->searchGroups($filter, $attr, $limit, $offset), (count($attr) > 1));
}
private function fetchList($list, $manyAttributes) {
if(is_array($list)) {
if($manyAttributes) {
return $list;
} else {
return array_unique($list, SORT_LOCALE_STRING);
}
}
//error cause actually, maybe throw an exception in future.
return array();
}
/**
* @brief executes an LDAP search, optimized for Users
* @param $filter the LDAP filter for the search
* @param $attr optional, when a certain attribute shall be filtered out
* @returns array with the search result
*
* Executes an LDAP search
*/
public function searchUsers($filter, $attr = null, $limit = null, $offset = null) {
return $this->search($filter, $this->connection->ldapBaseUsers, $attr, $limit, $offset);
}
/**
* @brief executes an LDAP search, optimized for Groups
* @param $filter the LDAP filter for the search
* @param $attr optional, when a certain attribute shall be filtered out
* @returns array with the search result
*
* Executes an LDAP search
*/
public function searchGroups($filter, $attr = null, $limit = null, $offset = null) {
return $this->search($filter, $this->connection->ldapBaseGroups, $attr, $limit, $offset);
}
/**
* @brief executes an LDAP search
* @param $filter the LDAP filter for the search
* @param $base the LDAP subtree that shall be searched
* @param $attr optional, when a certain attribute shall be filtered out
* @returns array with the search result
*
* Executes an LDAP search
*/
private function search($filter, $base, $attr = null, $limit = null, $offset = null, $skipHandling = false) {
if(!is_null($attr) && !is_array($attr)) {
$attr = array(mb_strtolower($attr, 'UTF-8'));
}
// See if we have a resource, in case not cancel with message
$link_resource = $this->connection->getConnectionResource();
if(!is_resource($link_resource)) {
// Seems like we didn't find any resource.
// Return an empty array just like before.
\OCP\Util::writeLog('user_ldap', 'Could not search, because resource is missing.', \OCP\Util::DEBUG);
return array();
}
//check wether paged search should be attempted
$pagedSearchOK = $this->initPagedSearch($filter, $base, $attr, $limit, $offset);
$sr = ldap_search($link_resource, $base, $filter, $attr);
if(!$sr) {
\OCP\Util::writeLog('user_ldap', 'Error when searching: '.ldap_error($link_resource).' code '.ldap_errno($link_resource), \OCP\Util::ERROR);
\OCP\Util::writeLog('user_ldap', 'Attempt for Paging? '.print_r($pagedSearchOK, true), \OCP\Util::ERROR);
return array();
}
$findings = ldap_get_entries($link_resource, $sr );
if($pagedSearchOK) {
\OCP\Util::writeLog('user_ldap', 'Paged search successful', \OCP\Util::INFO);
ldap_control_paged_result_response($link_resource, $sr, $cookie);
\OCP\Util::writeLog('user_ldap', 'Set paged search cookie '.$cookie, \OCP\Util::INFO);
$this->setPagedResultCookie($filter, $limit, $offset, $cookie);
//browsing through prior pages to get the cookie for the new one
if($skipHandling) {
return;
}
//if count is bigger, then the server does not support paged search. Instead, he did a normal search. We set a flag here, so the callee knows how to deal with it.
if($findings['count'] <= $limit) {
$this->pagedSearchedSuccessful = true;
}
} else {
\OCP\Util::writeLog('user_ldap', 'Paged search failed :(', \OCP\Util::INFO);
}
// if we're here, probably no connection resource is returned.
// to make ownCloud behave nicely, we simply give back an empty array.
if(is_null($findings)) {
return array();
}
if(!is_null($attr)) {
$selection = array();
$multiarray = false;
if(count($attr) > 1) {
$multiarray = true;
$i = 0;
}
foreach($findings as $item) {
if(!is_array($item)) {
continue;
}
$item = \OCP\Util::mb_array_change_key_case($item, MB_CASE_LOWER, 'UTF-8');
if($multiarray) {
foreach($attr as $key) {
$key = mb_strtolower($key, 'UTF-8');
if(isset($item[$key])) {
if($key != 'dn') {
$selection[$i][$key] = $this->resemblesDN($key) ? $this->sanitizeDN($item[$key][0]) : $item[$key][0];
} else {
$selection[$i][$key] = $this->sanitizeDN($item[$key]);
}
}
}
$i++;
} else {
//tribute to case insensitivity
$key = mb_strtolower($attr[0], 'UTF-8');
if(isset($item[$key])) {
if($this->resemblesDN($key)) {
$selection[] = $this->sanitizeDN($item[$key]);
} else {
$selection[] = $item[$key];
}
}
}
}
$findings = $selection;
}
//we slice the findings, when
//a) paged search insuccessful, though attempted
//b) no paged search, but limit set
if((!$this->pagedSearchedSuccessful
&& $pagedSearchOK)
|| (
!$pagedSearchOK
&& !is_null($limit)
)
) {
$findings = array_slice($findings, intval($offset), $limit);
}
return $findings;
}
public function sanitizeUsername($name) {
if($this->connection->ldapIgnoreNamingRules) {
return $name;
}
// Translitaration
//latin characters to ASCII
$name = iconv('UTF-8', 'ASCII//TRANSLIT', $name);
//REPLACEMENTS
$name = \OCP\Util::mb_str_replace(' ', '_', $name, 'UTF-8');
//every remaining unallowed characters will be removed
$name = preg_replace('/[^a-zA-Z0-9_.@-]/u', '', $name);
return $name;
}
/**
* @brief combines the input filters with AND
* @param $filters array, the filters to connect
* @returns the combined filter
*
* Combines Filter arguments with AND
*/
public function combineFilterWithAnd($filters) {
return $this->combineFilter($filters, '&');
}
/**
* @brief combines the input filters with AND
* @param $filters array, the filters to connect
* @returns the combined filter
*
* Combines Filter arguments with AND
*/
public function combineFilterWithOr($filters) {
return $this->combineFilter($filters, '|');
}
/**
* @brief combines the input filters with given operator
* @param $filters array, the filters to connect
* @param $operator either & or |
* @returns the combined filter
*
* Combines Filter arguments with AND
*/
private function combineFilter($filters, $operator) {
$combinedFilter = '('.$operator;
foreach($filters as $filter) {
if($filter[0] != '(') {
$filter = '('.$filter.')';
}
$combinedFilter.=$filter;
}
$combinedFilter.=')';
return $combinedFilter;
}
public function areCredentialsValid($name, $password) {
$testConnection = clone $this->connection;
$credentials = array(
'ldapAgentName' => $name,
'ldapAgentPassword' => $password
);
if(!$testConnection->setConfiguration($credentials)) {
return false;
}
return $testConnection->bind();
}
/**
* @brief auto-detects the directory's UUID attribute
* @param $dn a known DN used to check against
* @param $force the detection should be run, even if it is not set to auto
* @returns true on success, false otherwise
*/
private function detectUuidAttribute($dn, $force = false) {
if(($this->connection->ldapUuidAttribute != 'auto') && !$force) {
return true;
}
//for now, supported (known) attributes are entryUUID, nsuniqueid, objectGUID
$testAttributes = array('entryuuid', 'nsuniqueid', 'objectguid');
foreach($testAttributes as $attribute) {
\OCP\Util::writeLog('user_ldap', 'Testing '.$attribute.' as UUID attr', \OCP\Util::DEBUG);
$value = $this->readAttribute($dn, $attribute);
if(is_array($value) && isset($value[0]) && !empty($value[0])) {
\OCP\Util::writeLog('user_ldap', 'Setting '.$attribute.' as UUID attr', \OCP\Util::DEBUG);
$this->connection->ldapUuidAttribute = $attribute;
return true;
}
\OCP\Util::writeLog('user_ldap', 'The looked for uuid attr is not '.$attribute.', result was '.print_r($value, true), \OCP\Util::DEBUG);
}
return false;
}
public function getUUID($dn) {
if($this->detectUuidAttribute($dn)) {
$uuid = $this->readAttribute($dn, $this->connection->ldapUuidAttribute);
if(!is_array($uuid) && $this->connection->ldapOverrideUuidAttribute) {
$this->detectUuidAttribute($dn, true);
$uuid = $this->readAttribute($dn, $this->connection->ldapUuidAttribute);
}
if(is_array($uuid) && isset($uuid[0]) && !empty($uuid[0])) {
$uuid = $uuid[0];
} else {
$uuid = false;
}
} else {
$uuid = false;
}
return $uuid;
}
/**
* @brief get a cookie for the next LDAP paged search
* @param $filter the search filter to identify the correct search
* @param $limit the limit (or 'pageSize'), to identify the correct search well
* @param $offset the offset for the new search to identify the correct search really good
* @returns string containing the key or empty if none is cached
*/
private function getPagedResultCookie($filter, $limit, $offset) {
if($offset == 0) {
return '';
}
$offset -= $limit;
//we work with cache here
$cachekey = 'lc' . dechex(crc32($filter)) . '-' . $limit . '-' . $offset;
$cookie = $this->connection->getFromCache($cachekey);
if(is_null($cookie)) {
$cookie = '';
}
return $cookie;
}
/**
* @brief set a cookie for LDAP paged search run
* @param $filter the search filter to identify the correct search
* @param $limit the limit (or 'pageSize'), to identify the correct search well
* @param $offset the offset for the run search to identify the correct search really good
* @param $cookie string containing the cookie returned by ldap_control_paged_result_response
* @return void
*/
private function setPagedResultCookie($filter, $limit, $offset) {
if(!empty($cookie)) {
$cachekey = 'lc' . dechex(crc32($filter)) . '-' . $limit . '-' . $offset;
$cookie = $this->connection->writeToCache($cachekey, $cookie);
}
}
/**
* @brief check wether the most recent paged search was successful. It flushed the state var. Use it always after a possible paged search.
* @return true on success, null or false otherwise
*/
public function getPagedSearchResultState() {
$result = $this->pagedSearchedSuccessful;
$this->pagedSearchedSuccessful = null;
return $result;
}
/**
* @brief prepares a paged search, if possible
* @param $filter the LDAP filter for the search
* @param $base the LDAP subtree that shall be searched
* @param $attr optional, when a certain attribute shall be filtered outside
* @param $limit
* @param $offset
*
*/
private function initPagedSearch($filter, $base, $attr, $limit, $offset) {
$pagedSearchOK = false;
if($this->connection->hasPagedResultSupport && !is_null($limit)) {
$offset = intval($offset); //can be null
\OCP\Util::writeLog('user_ldap', 'initializing paged search for Filter'.$filter.' base '.$base.' attr '.print_r($attr, true). ' limit ' .$limit.' offset '.$offset, \OCP\Util::DEBUG);
//get the cookie from the search for the previous search, required by LDAP
$cookie = $this->getPagedResultCookie($filter, $limit, $offset);
if(empty($cookie) && ($offset > 0)) {
//no cookie known, although the offset is not 0. Maybe cache run out. We need to start all over *sigh* (btw, Dear Reader, did you need LDAP paged searching was designed by MSFT?)
$reOffset = ($offset - $limit) < 0 ? 0 : $offset - $limit;
//a bit recursive, $offset of 0 is the exit
\OCP\Util::writeLog('user_ldap', 'Looking for cookie L/O '.$limit.'/'.$reOffset, \OCP\Util::INFO);
$this->search($filter, $base, $attr, $limit, $reOffset, true);
$cookie = $this->getPagedResultCookie($filter, $limit, $offset);
//still no cookie? obviously, the server does not like us. Let's skip paging efforts.
//TODO: remember this, probably does not change in the next request...
if(empty($cookie)) {
$cookie = null;
}
}
if(!is_null($cookie)) {
if($offset > 0) {
\OCP\Util::writeLog('user_ldap', 'Cookie '.$cookie, \OCP\Util::INFO);
}
$pagedSearchOK = ldap_control_paged_result($this->connection->getConnectionResource(), $limit, false, $cookie);
\OCP\Util::writeLog('user_ldap', 'Ready for a paged search', \OCP\Util::INFO);
} else {
\OCP\Util::writeLog('user_ldap', 'No paged search for us, Cpt., Limit '.$limit.' Offset '.$offset, \OCP\Util::INFO);
}
}
return $pagedSearchOK;
}
}