699 lines
24 KiB
PHP
699 lines
24 KiB
PHP
<?php
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/**
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* LDAP authentication backend
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*
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* @license GPL 2 (http://www.gnu.org/licenses/gpl.html)
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* @author Andreas Gohr <andi@splitbrain.org>
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* @author Chris Smith <chris@jalakaic.co.uk>
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* @author Jan Schumann <js@schumann-it.com>
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*/
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class auth_plugin_authldap extends DokuWiki_Auth_Plugin
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{
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/* @var resource $con holds the LDAP connection */
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protected $con = null;
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/* @var int $bound What type of connection does already exist? */
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protected $bound = 0; // 0: anonymous, 1: user, 2: superuser
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/* @var array $users User data cache */
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protected $users = null;
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/* @var array $pattern User filter pattern */
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protected $pattern = null;
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/**
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* Constructor
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*/
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public function __construct()
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{
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parent::__construct();
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// ldap extension is needed
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if (!function_exists('ldap_connect')) {
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$this->debug("LDAP err: PHP LDAP extension not found.", -1, __LINE__, __FILE__);
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$this->success = false;
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return;
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}
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// Add the capabilities to change the password
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$this->cando['modPass'] = $this->getConf('modPass');
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}
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/**
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* Check user+password
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*
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* Checks if the given user exists and the given
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* plaintext password is correct by trying to bind
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* to the LDAP server
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*
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* @param string $user
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* @param string $pass
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* @return bool
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* @author Andreas Gohr <andi@splitbrain.org>
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*/
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public function checkPass($user, $pass)
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{
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// reject empty password
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if (empty($pass)) return false;
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if (!$this->openLDAP()) return false;
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// indirect user bind
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if ($this->getConf('binddn') && $this->getConf('bindpw')) {
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// use superuser credentials
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if (!@ldap_bind($this->con, $this->getConf('binddn'), conf_decodeString($this->getConf('bindpw')))) {
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$this->debug('LDAP bind as superuser: ' . hsc(ldap_error($this->con)), 0, __LINE__, __FILE__);
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return false;
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}
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$this->bound = 2;
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} elseif ($this->getConf('binddn') &&
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$this->getConf('usertree') &&
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$this->getConf('userfilter')
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) {
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// special bind string
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$dn = $this->makeFilter(
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$this->getConf('binddn'),
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array('user' => $user, 'server' => $this->getConf('server'))
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);
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} elseif (strpos($this->getConf('usertree'), '%{user}')) {
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// direct user bind
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$dn = $this->makeFilter(
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$this->getConf('usertree'),
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array('user' => $user, 'server' => $this->getConf('server'))
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);
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} else {
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// Anonymous bind
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if (!@ldap_bind($this->con)) {
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msg("LDAP: can not bind anonymously", -1);
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$this->debug('LDAP anonymous bind: ' . hsc(ldap_error($this->con)), 0, __LINE__, __FILE__);
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return false;
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}
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}
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// Try to bind to with the dn if we have one.
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if (!empty($dn)) {
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// User/Password bind
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if (!@ldap_bind($this->con, $dn, $pass)) {
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$this->debug("LDAP: bind with $dn failed", -1, __LINE__, __FILE__);
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$this->debug('LDAP user dn bind: ' . hsc(ldap_error($this->con)), 0, __LINE__, __FILE__);
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return false;
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}
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$this->bound = 1;
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return true;
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} else {
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// See if we can find the user
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$info = $this->fetchUserData($user, true);
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if (empty($info['dn'])) {
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return false;
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} else {
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$dn = $info['dn'];
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}
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// Try to bind with the dn provided
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if (!@ldap_bind($this->con, $dn, $pass)) {
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$this->debug("LDAP: bind with $dn failed", -1, __LINE__, __FILE__);
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$this->debug('LDAP user bind: ' . hsc(ldap_error($this->con)), 0, __LINE__, __FILE__);
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return false;
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}
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$this->bound = 1;
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return true;
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}
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}
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/**
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* Return user info
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*
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* Returns info about the given user needs to contain
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* at least these fields:
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*
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* name string full name of the user
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* mail string email addres of the user
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* grps array list of groups the user is in
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*
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* This LDAP specific function returns the following
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* addional fields:
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*
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* dn string distinguished name (DN)
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* uid string Posix User ID
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* inbind bool for internal use - avoid loop in binding
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*
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* @param string $user
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* @param bool $requireGroups (optional) - ignored, groups are always supplied by this plugin
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* @return array containing user data or false
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* @author <evaldas.auryla@pheur.org>
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* @author Stephane Chazelas <stephane.chazelas@emerson.com>
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* @author Steffen Schoch <schoch@dsb.net>
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*
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* @author Andreas Gohr <andi@splitbrain.org>
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* @author Trouble
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* @author Dan Allen <dan.j.allen@gmail.com>
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*/
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public function getUserData($user, $requireGroups = true)
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{
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return $this->fetchUserData($user);
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}
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/**
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* @param string $user
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* @param bool $inbind authldap specific, true if in bind phase
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* @return array containing user data or false
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*/
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protected function fetchUserData($user, $inbind = false)
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{
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global $conf;
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if (!$this->openLDAP()) return array();
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// force superuser bind if wanted and not bound as superuser yet
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if ($this->getConf('binddn') && $this->getConf('bindpw') && $this->bound < 2) {
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// use superuser credentials
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if (!@ldap_bind($this->con, $this->getConf('binddn'), conf_decodeString($this->getConf('bindpw')))) {
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$this->debug('LDAP bind as superuser: ' . hsc(ldap_error($this->con)), 0, __LINE__, __FILE__);
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return array();
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}
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$this->bound = 2;
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} elseif ($this->bound == 0 && !$inbind) {
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// in some cases getUserData is called outside the authentication workflow
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// eg. for sending email notification on subscribed pages. This data might not
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// be accessible anonymously, so we try to rebind the current user here
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list($loginuser, $loginsticky, $loginpass) = auth_getCookie();
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if ($loginuser && $loginpass) {
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$loginpass = auth_decrypt($loginpass, auth_cookiesalt(!$loginsticky, true));
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$this->checkPass($loginuser, $loginpass);
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}
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}
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$info = array();
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$info['user'] = $user;
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$this->debug('LDAP user to find: ' . hsc($info['user']), 0, __LINE__, __FILE__);
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$info['server'] = $this->getConf('server');
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$this->debug('LDAP Server: ' . hsc($info['server']), 0, __LINE__, __FILE__);
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//get info for given user
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$base = $this->makeFilter($this->getConf('usertree'), $info);
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if ($this->getConf('userfilter')) {
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$filter = $this->makeFilter($this->getConf('userfilter'), $info);
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} else {
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$filter = "(ObjectClass=*)";
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}
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$this->debug('LDAP Filter: ' . hsc($filter), 0, __LINE__, __FILE__);
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$this->debug('LDAP user search: ' . hsc(ldap_error($this->con)), 0, __LINE__, __FILE__);
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$this->debug('LDAP search at: ' . hsc($base . ' ' . $filter), 0, __LINE__, __FILE__);
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$sr = $this->ldapSearch($this->con, $base, $filter, $this->getConf('userscope'), $this->getConf('attributes'));
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$result = @ldap_get_entries($this->con, $sr);
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// if result is not an array
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if (!is_array($result)) {
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// no objects found
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$this->debug('LDAP search returned non-array result: ' . hsc(print($result)), -1, __LINE__, __FILE__);
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return array();
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}
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// Don't accept more or less than one response
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if ($result['count'] != 1) {
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$this->debug(
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'LDAP search returned ' . hsc($result['count']) . ' results while it should return 1!',
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-1,
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__LINE__,
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__FILE__
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);
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//for($i = 0; $i < $result["count"]; $i++) {
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//$this->_debug('result: '.hsc(print_r($result[$i])), 0, __LINE__, __FILE__);
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//}
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return array();
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}
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$this->debug('LDAP search found single result !', 0, __LINE__, __FILE__);
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$user_result = $result[0];
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ldap_free_result($sr);
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// general user info
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$info['dn'] = $user_result['dn'];
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$info['gid'] = $user_result['gidnumber'][0];
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$info['mail'] = $user_result['mail'][0];
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$info['name'] = $user_result['cn'][0];
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$info['grps'] = array();
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// overwrite if other attribs are specified.
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if (is_array($this->getConf('mapping'))) {
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foreach ($this->getConf('mapping') as $localkey => $key) {
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if (is_array($key)) {
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// use regexp to clean up user_result
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// $key = array($key=>$regexp), only handles the first key-value
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$regexp = current($key);
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$key = key($key);
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if ($user_result[$key]) foreach ($user_result[$key] as $grpkey => $grp) {
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if ($grpkey !== 'count' && preg_match($regexp, $grp, $match)) {
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if ($localkey == 'grps') {
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$info[$localkey][] = $match[1];
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} else {
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$info[$localkey] = $match[1];
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}
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}
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}
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} else {
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$info[$localkey] = $user_result[$key][0];
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}
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}
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}
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$user_result = array_merge($info, $user_result);
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//get groups for given user if grouptree is given
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if ($this->getConf('grouptree') || $this->getConf('groupfilter')) {
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$base = $this->makeFilter($this->getConf('grouptree'), $user_result);
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$filter = $this->makeFilter($this->getConf('groupfilter'), $user_result);
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$sr = $this->ldapSearch(
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$this->con,
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$base,
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$filter,
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$this->getConf('groupscope'),
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array($this->getConf('groupkey'))
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);
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$this->debug('LDAP group search: ' . hsc(ldap_error($this->con)), 0, __LINE__, __FILE__);
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$this->debug('LDAP search at: ' . hsc($base . ' ' . $filter), 0, __LINE__, __FILE__);
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if (!$sr) {
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msg("LDAP: Reading group memberships failed", -1);
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return array();
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}
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$result = ldap_get_entries($this->con, $sr);
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ldap_free_result($sr);
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if (is_array($result)) foreach ($result as $grp) {
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if (!empty($grp[$this->getConf('groupkey')])) {
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$group = $grp[$this->getConf('groupkey')];
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if (is_array($group)) {
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$group = $group[0];
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} else {
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$this->debug('groupkey did not return a detailled result', 0, __LINE__, __FILE__);
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}
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if ($group === '') continue;
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$this->debug('LDAP usergroup: ' . hsc($group), 0, __LINE__, __FILE__);
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$info['grps'][] = $group;
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}
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}
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}
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// always add the default group to the list of groups
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if (!$info['grps'] or !in_array($conf['defaultgroup'], $info['grps'])) {
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$info['grps'][] = $conf['defaultgroup'];
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}
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return $info;
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}
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/**
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* Definition of the function modifyUser in order to modify the password
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*
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* @param string $user nick of the user to be changed
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* @param array $changes array of field/value pairs to be changed (password will be clear text)
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* @return bool true on success, false on error
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*/
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public function modifyUser($user, $changes)
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{
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// open the connection to the ldap
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if (!$this->openLDAP()) {
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$this->debug('LDAP cannot connect: ' . hsc(ldap_error($this->con)), 0, __LINE__, __FILE__);
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return false;
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}
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// find the information about the user, in particular the "dn"
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$info = $this->getUserData($user, true);
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if (empty($info['dn'])) {
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$this->debug('LDAP cannot find your user dn', 0, __LINE__, __FILE__);
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return false;
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}
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$dn = $info['dn'];
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// find the old password of the user
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list($loginuser, $loginsticky, $loginpass) = auth_getCookie();
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if ($loginuser !== null) { // the user is currently logged in
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$secret = auth_cookiesalt(!$loginsticky, true);
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$pass = auth_decrypt($loginpass, $secret);
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// bind with the ldap
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if (!@ldap_bind($this->con, $dn, $pass)) {
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$this->debug(
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'LDAP user bind failed: ' . hsc($dn) . ': ' . hsc(ldap_error($this->con)),
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0,
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__LINE__,
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__FILE__
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);
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return false;
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}
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} elseif ($this->getConf('binddn') && $this->getConf('bindpw')) {
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// we are changing the password on behalf of the user (eg: forgotten password)
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// bind with the superuser ldap
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if (!@ldap_bind($this->con, $this->getConf('binddn'), conf_decodeString($this->getConf('bindpw')))) {
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$this->debug('LDAP bind as superuser: ' . hsc(ldap_error($this->con)), 0, __LINE__, __FILE__);
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return false;
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}
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} else {
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return false; // no otherway
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}
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// Generate the salted hashed password for LDAP
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$phash = new \dokuwiki\PassHash();
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$hash = $phash->hash_ssha($changes['pass']);
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// change the password
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if (!@ldap_mod_replace($this->con, $dn, array('userpassword' => $hash))) {
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$this->debug(
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'LDAP mod replace failed: ' . hsc($dn) . ': ' . hsc(ldap_error($this->con)),
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0,
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__LINE__,
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__FILE__
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);
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return false;
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}
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return true;
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}
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/**
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* Most values in LDAP are case-insensitive
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*
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* @return bool
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*/
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public function isCaseSensitive()
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{
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return false;
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}
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/**
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* Bulk retrieval of user data
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*
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* @param int $start index of first user to be returned
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* @param int $limit max number of users to be returned
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* @param array $filter array of field/pattern pairs, null for no filter
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* @return array of userinfo (refer getUserData for internal userinfo details)
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* @author Dominik Eckelmann <dokuwiki@cosmocode.de>
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*/
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public function retrieveUsers($start = 0, $limit = 0, $filter = array())
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{
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if (!$this->openLDAP()) return array();
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if (is_null($this->users)) {
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// Perform the search and grab all their details
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if ($this->getConf('userfilter')) {
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$all_filter = str_replace('%{user}', '*', $this->getConf('userfilter'));
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} else {
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$all_filter = "(ObjectClass=*)";
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}
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$sr = ldap_search($this->con, $this->getConf('usertree'), $all_filter);
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$entries = ldap_get_entries($this->con, $sr);
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$users_array = array();
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$userkey = $this->getConf('userkey');
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for ($i = 0; $i < $entries["count"]; $i++) {
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array_push($users_array, $entries[$i][$userkey][0]);
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}
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asort($users_array);
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$result = $users_array;
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if (!$result) return array();
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$this->users = array_fill_keys($result, false);
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}
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$i = 0;
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$count = 0;
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$this->constructPattern($filter);
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$result = array();
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foreach ($this->users as $user => &$info) {
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if ($i++ < $start) {
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continue;
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}
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if ($info === false) {
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$info = $this->getUserData($user);
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}
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if ($this->filter($user, $info)) {
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$result[$user] = $info;
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if (($limit > 0) && (++$count >= $limit)) break;
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}
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}
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return $result;
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}
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/**
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* Make LDAP filter strings.
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*
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* Used by auth_getUserData to make the filter
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* strings for grouptree and groupfilter
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*
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* @param string $filter ldap search filter with placeholders
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* @param array $placeholders placeholders to fill in
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* @return string
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* @author Troels Liebe Bentsen <tlb@rapanden.dk>
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*/
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protected function makeFilter($filter, $placeholders)
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{
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preg_match_all("/%{([^}]+)/", $filter, $matches, PREG_PATTERN_ORDER);
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//replace each match
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foreach ($matches[1] as $match) {
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//take first element if array
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if (is_array($placeholders[$match])) {
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$value = $placeholders[$match][0];
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} else {
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$value = $placeholders[$match];
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}
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$value = $this->filterEscape($value);
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$filter = str_replace('%{' . $match . '}', $value, $filter);
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}
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return $filter;
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}
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/**
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* return true if $user + $info match $filter criteria, false otherwise
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*
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* @param string $user the user's login name
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* @param array $info the user's userinfo array
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* @return bool
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* @author Chris Smith <chris@jalakai.co.uk>
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*
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*/
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protected function filter($user, $info)
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{
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foreach ($this->pattern as $item => $pattern) {
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if ($item == 'user') {
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if (!preg_match($pattern, $user)) return false;
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} elseif ($item == 'grps') {
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if (!count(preg_grep($pattern, $info['grps']))) return false;
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} else {
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if (!preg_match($pattern, $info[$item])) return false;
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}
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}
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return true;
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}
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/**
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* Set the filter pattern
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*
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* @param $filter
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* @return void
|
|
* @author Chris Smith <chris@jalakai.co.uk>
|
|
*
|
|
*/
|
|
protected function constructPattern($filter)
|
|
{
|
|
$this->pattern = array();
|
|
foreach ($filter as $item => $pattern) {
|
|
$this->pattern[$item] = '/' . str_replace('/', '\/', $pattern) . '/i'; // allow regex characters
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Escape a string to be used in a LDAP filter
|
|
*
|
|
* Ported from Perl's Net::LDAP::Util escape_filter_value
|
|
*
|
|
* @param string $string
|
|
* @return string
|
|
* @author Andreas Gohr
|
|
*/
|
|
protected function filterEscape($string)
|
|
{
|
|
// see https://github.com/adldap/adLDAP/issues/22
|
|
return preg_replace_callback(
|
|
'/([\x00-\x1F\*\(\)\\\\])/',
|
|
function ($matches) {
|
|
return "\\" . join("", unpack("H2", $matches[1]));
|
|
},
|
|
$string
|
|
);
|
|
}
|
|
|
|
/**
|
|
* Opens a connection to the configured LDAP server and sets the wanted
|
|
* option on the connection
|
|
*
|
|
* @author Andreas Gohr <andi@splitbrain.org>
|
|
*/
|
|
protected function openLDAP()
|
|
{
|
|
if ($this->con) return true; // connection already established
|
|
|
|
if ($this->getConf('debug')) {
|
|
ldap_set_option(null, LDAP_OPT_DEBUG_LEVEL, 7);
|
|
}
|
|
|
|
$this->bound = 0;
|
|
|
|
$port = $this->getConf('port');
|
|
$bound = false;
|
|
$servers = explode(',', $this->getConf('server'));
|
|
foreach ($servers as $server) {
|
|
$server = trim($server);
|
|
$this->con = @ldap_connect($server, $port);
|
|
if (!$this->con) {
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* When OpenLDAP 2.x.x is used, ldap_connect() will always return a resource as it does
|
|
* not actually connect but just initializes the connecting parameters. The actual
|
|
* connect happens with the next calls to ldap_* funcs, usually with ldap_bind().
|
|
*
|
|
* So we should try to bind to server in order to check its availability.
|
|
*/
|
|
|
|
//set protocol version and dependend options
|
|
if ($this->getConf('version')) {
|
|
if (!@ldap_set_option(
|
|
$this->con,
|
|
LDAP_OPT_PROTOCOL_VERSION,
|
|
$this->getConf('version')
|
|
)
|
|
) {
|
|
msg('Setting LDAP Protocol version ' . $this->getConf('version') . ' failed', -1);
|
|
$this->debug('LDAP version set: ' . hsc(ldap_error($this->con)), 0, __LINE__, __FILE__);
|
|
} else {
|
|
//use TLS (needs version 3)
|
|
if ($this->getConf('starttls')) {
|
|
if (!@ldap_start_tls($this->con)) {
|
|
msg('Starting TLS failed', -1);
|
|
$this->debug('LDAP TLS set: ' . hsc(ldap_error($this->con)), 0, __LINE__, __FILE__);
|
|
}
|
|
}
|
|
// needs version 3
|
|
if ($this->getConf('referrals') > -1) {
|
|
if (!@ldap_set_option(
|
|
$this->con,
|
|
LDAP_OPT_REFERRALS,
|
|
$this->getConf('referrals')
|
|
)
|
|
) {
|
|
msg('Setting LDAP referrals failed', -1);
|
|
$this->debug('LDAP referal set: ' . hsc(ldap_error($this->con)), 0, __LINE__, __FILE__);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
//set deref mode
|
|
if ($this->getConf('deref')) {
|
|
if (!@ldap_set_option($this->con, LDAP_OPT_DEREF, $this->getConf('deref'))) {
|
|
msg('Setting LDAP Deref mode ' . $this->getConf('deref') . ' failed', -1);
|
|
$this->debug('LDAP deref set: ' . hsc(ldap_error($this->con)), 0, __LINE__, __FILE__);
|
|
}
|
|
}
|
|
/* As of PHP 5.3.0 we can set timeout to speedup skipping of invalid servers */
|
|
if (defined('LDAP_OPT_NETWORK_TIMEOUT')) {
|
|
ldap_set_option($this->con, LDAP_OPT_NETWORK_TIMEOUT, 1);
|
|
}
|
|
|
|
if ($this->getConf('binddn') && $this->getConf('bindpw')) {
|
|
$bound = @ldap_bind($this->con, $this->getConf('binddn'), conf_decodeString($this->getConf('bindpw')));
|
|
$this->bound = 2;
|
|
} else {
|
|
$bound = @ldap_bind($this->con);
|
|
}
|
|
if ($bound) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!$bound) {
|
|
msg("LDAP: couldn't connect to LDAP server", -1);
|
|
$this->debug(ldap_error($this->con), 0, __LINE__, __FILE__);
|
|
return false;
|
|
}
|
|
|
|
$this->cando['getUsers'] = true;
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Wraps around ldap_search, ldap_list or ldap_read depending on $scope
|
|
*
|
|
* @param resource $link_identifier
|
|
* @param string $base_dn
|
|
* @param string $filter
|
|
* @param string $scope can be 'base', 'one' or 'sub'
|
|
* @param null|array $attributes
|
|
* @param int $attrsonly
|
|
* @param int $sizelimit
|
|
* @return resource
|
|
* @author Andreas Gohr <andi@splitbrain.org>
|
|
*/
|
|
protected function ldapSearch(
|
|
$link_identifier,
|
|
$base_dn,
|
|
$filter,
|
|
$scope = 'sub',
|
|
$attributes = null,
|
|
$attrsonly = 0,
|
|
$sizelimit = 0
|
|
)
|
|
{
|
|
if (is_null($attributes)) $attributes = array();
|
|
|
|
if ($scope == 'base') {
|
|
return @ldap_read(
|
|
$link_identifier,
|
|
$base_dn,
|
|
$filter,
|
|
$attributes,
|
|
$attrsonly,
|
|
$sizelimit
|
|
);
|
|
} elseif ($scope == 'one') {
|
|
return @ldap_list(
|
|
$link_identifier,
|
|
$base_dn,
|
|
$filter,
|
|
$attributes,
|
|
$attrsonly,
|
|
$sizelimit
|
|
);
|
|
} else {
|
|
return @ldap_search(
|
|
$link_identifier,
|
|
$base_dn,
|
|
$filter,
|
|
$attributes,
|
|
$attrsonly,
|
|
$sizelimit
|
|
);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Wrapper around msg() but outputs only when debug is enabled
|
|
*
|
|
* @param string $message
|
|
* @param int $err
|
|
* @param int $line
|
|
* @param string $file
|
|
* @return void
|
|
*/
|
|
protected function debug($message, $err, $line, $file)
|
|
{
|
|
if (!$this->getConf('debug')) return;
|
|
msg($message, $err, $line, $file);
|
|
}
|
|
}
|