607 lines
No EOL
19 KiB
PHP
607 lines
No EOL
19 KiB
PHP
<?php
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/**
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* ownCloud – LDAP Access
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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\lib;
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abstract class Access {
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protected $connection;
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public function setConnector(Connection &$connection) {
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$this->connection = $connection;
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}
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private function checkConnection() {
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return ($this->connection instanceof Connection);
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}
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/**
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* @brief reads a given attribute for an LDAP record identified by a DN
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* @param $dn the record in question
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* @param $attr the attribute that shall be retrieved
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* @returns the values in an array on success, false otherwise
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*
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* Reads an attribute from an LDAP entry
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*/
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public function readAttribute($dn, $attr) {
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if(!$this->checkConnection()) {
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\OCP\Util::writeLog('user_ldap', 'No LDAP Connector assigned, access impossible for readAttribute.', \OCP\Util::WARN);
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return false;
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}
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$cr = $this->connection->getConnectionResource();
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if(!is_resource($cr)) {
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//LDAP not available
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return false;
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}
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$rr = @ldap_read($cr, $dn, 'objectClass=*', array($attr));
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if(!is_resource($rr)) {
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\OCP\Util::writeLog('user_ldap', 'readAttribute failed for DN '.$dn, \OCP\Util::DEBUG);
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//in case an error occurs , e.g. object does not exist
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return false;
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}
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$er = ldap_first_entry($cr, $rr);
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//LDAP attributes are not case sensitive
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$result = \OCP\Util::mb_array_change_key_case(ldap_get_attributes($cr, $er), MB_CASE_LOWER, 'UTF-8');
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$attr = mb_strtolower($attr, 'UTF-8');
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if(isset($result[$attr]) && $result[$attr]['count'] > 0) {
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$values = array();
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for($i=0;$i<$result[$attr]['count'];$i++) {
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$values[] = $this->resemblesDN($attr) ? $this->sanitizeDN($result[$attr][$i]) : $result[$attr][$i];
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}
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return $values;
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}
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return false;
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}
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/**
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* @brief checks wether the given attribute`s valua is probably a DN
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* @param $attr the attribute in question
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* @return if so true, otherwise false
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*/
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private function resemblesDN($attr) {
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$resemblingAttributes = array(
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'dn',
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'uniquemember',
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'member'
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);
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return in_array($attr, $resemblingAttributes);
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}
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/**
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* @brief sanitizes a DN received from the LDAP server
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* @param $dn the DN in question
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* @return the sanitized DN
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*/
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private function sanitizeDN($dn) {
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//OID sometimes gives back DNs with whitespace after the comma a la "uid=foo, cn=bar, dn=..." We need to tackle this!
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$dn = preg_replace('/([^\\\]),(\s+)/u', '\1,', $dn);
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//make comparisons and everything work
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$dn = mb_strtolower($dn, 'UTF-8');
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return $dn;
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}
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/**
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* gives back the database table for the query
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*/
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private function getMapTable($isUser) {
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if($isUser) {
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return '*PREFIX*ldap_user_mapping';
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} else {
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return '*PREFIX*ldap_group_mapping';
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}
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}
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/**
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* @brief returns the LDAP DN for the given internal ownCloud name of the group
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* @param $name the ownCloud name in question
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* @returns string with the LDAP DN on success, otherwise false
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*
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* returns the LDAP DN for the given internal ownCloud name of the group
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*/
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public function groupname2dn($name) {
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return $this->ocname2dn($name, false);
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}
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/**
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* @brief returns the LDAP DN for the given internal ownCloud name of the user
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* @param $name the ownCloud name in question
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* @returns string with the LDAP DN on success, otherwise false
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*
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* returns the LDAP DN for the given internal ownCloud name of the user
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*/
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public function username2dn($name) {
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$dn = $this->ocname2dn($name, true);
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if($dn) {
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return $dn;
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} else {
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//fallback: user is not mapped
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$filter = $this->combineFilterWithAnd(array(
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$this->connection->ldapUserFilter,
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$this->connection->ldapUserDisplayName . '=' . $name,
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));
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$result = $this->searchUsers($filter, 'dn');
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if(isset($result[0]['dn'])) {
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$this->mapComponent($result[0], $name, true);
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return $result[0];
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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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* @brief returns the LDAP DN for the given internal ownCloud name
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* @param $name the ownCloud name in question
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* @param $isUser is it a user? otherwise group
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* @returns string with the LDAP DN on success, otherwise false
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*
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* returns the LDAP DN for the given internal ownCloud name
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*/
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private function ocname2dn($name, $isUser) {
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$table = $this->getMapTable($isUser);
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$query = \OCP\DB::prepare('
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SELECT ldap_dn
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FROM '.$table.'
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WHERE owncloud_name = ?
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');
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$record = $query->execute(array($name))->fetchOne();
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return $record;
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}
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/**
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* @brief returns the internal ownCloud name for the given LDAP DN of the group
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* @param $dn the dn of the group object
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* @param $ldapname optional, the display name of the object
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* @returns string with with the name to use in ownCloud, false on DN outside of search DN
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*
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* returns the internal ownCloud name for the given LDAP DN of the group, false on DN outside of search DN or failure
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*/
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public function dn2groupname($dn, $ldapname = null) {
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if(mb_strripos($dn, $this->sanitizeDN($this->connection->ldapBaseGroups), 0, 'UTF-8') !== (mb_strlen($dn, 'UTF-8')-mb_strlen($this->sanitizeDN($this->connection->ldapBaseGroups), 'UTF-8'))) {
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return false;
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}
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return $this->dn2ocname($dn, $ldapname, false);
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}
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/**
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* @brief returns the internal ownCloud name for the given LDAP DN of the user
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* @param $dn the dn of the user object
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* @param $ldapname optional, the display name of the object
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* @returns string with with the name to use in ownCloud
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*
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* returns the internal ownCloud name for the given LDAP DN of the user, false on DN outside of search DN or failure
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*/
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public function dn2username($dn, $ldapname = null) {
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if(mb_strripos($dn, $this->sanitizeDN($this->connection->ldapBaseUsers), 0, 'UTF-8') !== (mb_strlen($dn, 'UTF-8')-mb_strlen($this->sanitizeDN($this->connection->ldapBaseUsers), 'UTF-8'))) {
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return false;
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}
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return $this->dn2ocname($dn, $ldapname, true);
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}
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/**
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* @brief returns an internal ownCloud name for the given LDAP DN
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* @param $dn the dn of the user object
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* @param $ldapname optional, the display name of the object
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* @param $isUser optional, wether it is a user object (otherwise group assumed)
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* @returns string with with the name to use in ownCloud
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*
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* returns the internal ownCloud name for the given LDAP DN of the user, false on DN outside of search DN
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*/
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public function dn2ocname($dn, $ldapname = null, $isUser = true) {
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$dn = $this->sanitizeDN($dn);
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$table = $this->getMapTable($isUser);
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if($isUser) {
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$nameAttribute = $this->connection->ldapUserDisplayName;
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} else {
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$nameAttribute = $this->connection->ldapGroupDisplayName;
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}
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$query = \OCP\DB::prepare('
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SELECT owncloud_name
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FROM '.$table.'
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WHERE ldap_dn = ?
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');
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$component = $query->execute(array($dn))->fetchOne();
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if($component) {
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return $component;
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}
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if(is_null($ldapname)) {
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$ldapname = $this->readAttribute($dn, $nameAttribute);
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if(!isset($ldapname[0]) && empty($ldapname[0])) {
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\OCP\Util::writeLog('user_ldap', 'No or empty name for '.$dn.'.', \OCP\Util::INFO);
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return false;
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}
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$ldapname = $ldapname[0];
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}
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$ldapname = $this->sanitizeUsername($ldapname);
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//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.
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if($this->mapComponent($dn, $ldapname, $isUser)) {
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return $ldapname;
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}
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//doh! There is a conflict. We need to distinguish between users/groups. Adding indexes is an idea, but not much of a help for the user. The DN is ugly, but for now the only reasonable way. But we transform it to a readable format and remove the first part to only give the path where this object is located.
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$oc_name = $this->alternateOwnCloudName($ldapname, $dn);
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if($this->mapComponent($dn, $oc_name, $isUser)) {
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return $oc_name;
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}
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//if everything else did not help..
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\OCP\Util::writeLog('user_ldap', 'Could not create unique ownCloud name for '.$dn.'.', \OCP\Util::INFO);
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}
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/**
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* @brief gives back the user names as they are used ownClod internally
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* @param $ldapGroups an array with the ldap Users result in style of array ( array ('dn' => foo, 'uid' => bar), ... )
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* @returns an array with the user names to use in ownCloud
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*
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* gives back the user names as they are used ownClod internally
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*/
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public function ownCloudUserNames($ldapUsers) {
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return $this->ldap2ownCloudNames($ldapUsers, true);
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}
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/**
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* @brief gives back the group names as they are used ownClod internally
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* @param $ldapGroups an array with the ldap Groups result in style of array ( array ('dn' => foo, 'cn' => bar), ... )
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* @returns an array with the group names to use in ownCloud
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*
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* gives back the group names as they are used ownClod internally
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*/
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public function ownCloudGroupNames($ldapGroups) {
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return $this->ldap2ownCloudNames($ldapGroups, false);
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}
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private function ldap2ownCloudNames($ldapObjects, $isUsers) {
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if($isUsers) {
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$knownObjects = $this->mappedUsers();
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$nameAttribute = $this->connection->ldapUserDisplayName;
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} else {
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$knownObjects = $this->mappedGroups();
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$nameAttribute = $this->connection->ldapGroupDisplayName;
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}
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$ownCloudNames = array();
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foreach($ldapObjects as $ldapObject) {
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$key = \OCP\Util::recursiveArraySearch($knownObjects, $ldapObject['dn']);
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//everything is fine when we know the group
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if($key !== false) {
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$ownCloudNames[] = $knownObjects[$key]['owncloud_name'];
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continue;
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}
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//we do not take empty usernames
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if(!isset($ldapObject[$nameAttribute]) || empty($ldapObject[$nameAttribute])) {
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\OCP\Util::writeLog('user_ldap', 'No or empty name for '.$ldapObject['dn'].', skipping.', \OCP\Util::INFO);
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continue;
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}
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//a new group! Then let's try to add it. We're shooting into the blue with the group name, assuming that in most cases there will not be a conflict. But first make sure, that the display name contains only allowed characters.
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$ocname = $this->sanitizeUsername($ldapObject[$nameAttribute]);
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if($this->mapComponent($ldapObject['dn'], $ocname, $isUsers)) {
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$ownCloudNames[] = $ocname;
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continue;
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}
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//doh! There is a conflict. We need to distinguish between groups. Adding indexes is an idea, but not much of a help for the user. The DN is ugly, but for now the only reasonable way. But we transform it to a readable format and remove the first part to only give the path where this entry is located.
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$ocname = $this->alternateOwnCloudName($ocname, $ldapObject['dn']);
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if($this->mapComponent($ldapObject['dn'], $ocname, $isUsers)) {
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$ownCloudNames[] = $ocname;
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continue;
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}
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//if everything else did not help..
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\OCP\Util::writeLog('user_ldap', 'Could not create unique ownCloud name for '.$ldapObject['dn'].', skipping.', \OCP\Util::INFO);
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}
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return $ownCloudNames;
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}
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/**
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* @brief creates a hopefully unique name for owncloud based on the display name and the dn of the LDAP object
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* @param $name the display name of the object
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* @param $dn the dn of the object
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* @returns string with with the name to use in ownCloud
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*
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* creates a hopefully unique name for owncloud based on the display name and the dn of the LDAP object
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*/
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private function alternateOwnCloudName($name, $dn) {
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$ufn = ldap_dn2ufn($dn);
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$name = $name . '@' . trim(\OCP\Util::mb_substr_replace($ufn, '', 0, mb_strpos($ufn, ',', 0, 'UTF-8'), 'UTF-8'));
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$name = $this->sanitizeUsername($name);
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return $name;
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}
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/**
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* @brief retrieves all known groups from the mappings table
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* @returns array with the results
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*
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* retrieves all known groups from the mappings table
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*/
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private function mappedGroups() {
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return $this->mappedComponents(false);
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}
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/**
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* @brief retrieves all known users from the mappings table
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* @returns array with the results
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*
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* retrieves all known users from the mappings table
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*/
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private function mappedUsers() {
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return $this->mappedComponents(true);
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}
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private function mappedComponents($isUsers) {
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$table = $this->getMapTable($isUsers);
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$query = \OCP\DB::prepare('
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SELECT ldap_dn, owncloud_name
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FROM '. $table
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);
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return $query->execute()->fetchAll();
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}
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/**
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* @brief inserts a new user or group into the mappings table
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* @param $dn the record in question
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* @param $ocname the name to use in ownCloud
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* @param $isUser is it a user or a group?
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* @returns true on success, false otherwise
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*
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* inserts a new user or group into the mappings table
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*/
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private function mapComponent($dn, $ocname, $isUser = true) {
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$table = $this->getMapTable($isUser);
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$dn = $this->sanitizeDN($dn);
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$sqlAdjustment = '';
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$dbtype = \OCP\Config::getSystemValue('dbtype');
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if($dbtype == 'mysql') {
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$sqlAdjustment = 'FROM dual';
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}
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$insert = \OCP\DB::prepare('
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INSERT INTO '.$table.' (ldap_dn, owncloud_name)
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SELECT ?,?
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'.$sqlAdjustment.'
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WHERE NOT EXISTS (
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SELECT 1
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FROM '.$table.'
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WHERE ldap_dn = ?
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OR owncloud_name = ? )
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');
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$res = $insert->execute(array($dn, $ocname, $dn, $ocname));
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if(\OCP\DB::isError($res)) {
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return false;
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}
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$insRows = $res->numRows();
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if($insRows == 0) {
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return false;
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}
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return true;
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}
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public function fetchListOfUsers($filter, $attr) {
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return $this->fetchList($this->searchUsers($filter, $attr), (count($attr) > 1));
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}
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public function fetchListOfGroups($filter, $attr) {
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return $this->fetchList($this->searchGroups($filter, $attr), (count($attr) > 1));
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}
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private function fetchList($list, $manyAttributes) {
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if(is_array($list)) {
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if($manyAttributes) {
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return $list;
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} else {
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return array_unique($list, SORT_LOCALE_STRING);
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}
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}
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//error cause actually, maybe throw an exception in future.
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return array();
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}
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/**
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* @brief executes an LDAP search, optimized for Users
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* @param $filter the LDAP filter for the search
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* @param $attr optional, when a certain attribute shall be filtered out
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* @returns array with the search result
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*
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* Executes an LDAP search
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*/
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public function searchUsers($filter, $attr = null) {
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return $this->search($filter, $this->connection->ldapBaseUsers, $attr);
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}
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/**
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* @brief executes an LDAP search, optimized for Groups
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* @param $filter the LDAP filter for the search
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* @param $attr optional, when a certain attribute shall be filtered out
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* @returns array with the search result
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*
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* Executes an LDAP search
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*/
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public function searchGroups($filter, $attr = null) {
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return $this->search($filter, $this->connection->ldapBaseGroups, $attr);
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}
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/**
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* @brief executes an LDAP search
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* @param $filter the LDAP filter for the search
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* @param $base the LDAP subtree that shall be searched
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* @param $attr optional, when a certain attribute shall be filtered out
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* @returns array with the search result
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*
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* Executes an LDAP search
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*/
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private function search($filter, $base, $attr = null) {
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if(!is_null($attr) && !is_array($attr)) {
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$attr = array(mb_strtolower($attr, 'UTF-8'));
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}
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// See if we have a resource
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$link_resource = $this->connection->getConnectionResource();
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if(is_resource($link_resource)) {
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$sr = ldap_search($link_resource, $base, $filter, $attr);
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$findings = ldap_get_entries($link_resource, $sr );
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// if we're here, probably no connection resource is returned.
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// to make ownCloud behave nicely, we simply give back an empty array.
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if(is_null($findings)) {
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return array();
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}
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} else {
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// Seems like we didn't find any resource.
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// Return an empty array just like before.
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\OCP\Util::writeLog('user_ldap', 'Could not search, because resource is missing.', \OCP\Util::DEBUG);
|
||
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];
|
||
}
|
||
}
|
||
}
|
||
}
|
||
return $selection;
|
||
}
|
||
return $findings;
|
||
}
|
||
|
||
public function sanitizeUsername($name) {
|
||
if($this->connection->ldapIgnoreNamingRules) {
|
||
return $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();
|
||
}
|
||
} |