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kolab_ldap.php
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kolab_ldap.php
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<?php
/**
* Kolab Authentication and User Base
*
* @author Aleksander Machniak <machniak@kolabsys.com>
*
* Copyright (C) 2011-2019, Kolab Systems AG <contact@kolabsys.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program 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 program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* Wrapper class for rcube_ldap_generic
*/
class kolab_ldap extends rcube_ldap_generic
{
private $conf = array();
private $fieldmap = array();
private $rcache;
function __construct($p)
{
$rcmail = rcube::get_instance();
$this->conf = $p;
$this->conf['kolab_auth_user_displayname'] = $rcmail->config->get('kolab_auth_user_displayname', '{name}');
$this->fieldmap = $p['fieldmap'];
$this->fieldmap['uid'] = 'uid';
$p['attributes'] = array_values($this->fieldmap);
$p['debug'] = (bool) $rcmail->config->get('ldap_debug');
if ($cache_type = $rcmail->config->get('ldap_cache', 'db')) {
$cache_ttl = $rcmail->config->get('ldap_cache_ttl', '10m');
$this->cache = $rcmail->get_cache('LDAP.kolab_cache', $cache_type, $cache_ttl);
}
// Connect to the server (with bind)
parent::__construct($p);
$this->_connect();
$rcmail->add_shutdown_function(array($this, 'close'));
}
/**
* Establish a connection to the LDAP server
*/
private function _connect()
{
// try to connect + bind for every host configured
// with OpenLDAP 2.x ldap_connect() always succeeds but ldap_bind will fail if host isn't reachable
// see http://www.php.net/manual/en/function.ldap-connect.php
foreach ((array)$this->config['hosts'] as $host) {
// skip host if connection failed
if (!$this->connect($host)) {
continue;
}
$bind_pass = $this->config['bind_pass'];
$bind_user = $this->config['bind_user'];
$bind_dn = $this->config['bind_dn'];
$base_dn = $this->config['base_dn'];
$groups_base_dn = $this->config['groups']['base_dn'] ?: $base_dn;
// User specific access, generate the proper values to use.
if ($this->config['user_specific']) {
$rcube = rcube::get_instance();
// No password set, use the session password
if (empty($bind_pass)) {
$bind_pass = $rcube->get_user_password();
}
// Get the pieces needed for variable replacement.
if ($fu = ($rcube->get_user_email() ?: $this->config['username'])) {
list($u, $d) = explode('@', $fu);
}
else {
$d = $this->config['mail_domain'];
}
$dc = 'dc=' . strtr($d, array('.' => ',dc=')); // hierarchal domain string
// resolve $dc through LDAP
if (!empty($this->config['domain_filter']) && !empty($this->config['search_bind_dn'])) {
$this->bind($this->config['search_bind_dn'], $this->config['search_bind_pw']);
$dc = $this->domain_root_dn($d);
}
$replaces = array('%dn' => '', '%dc' => $dc, '%d' => $d, '%fu' => $fu, '%u' => $u);
// Search for the dn to use to authenticate
if ($this->config['search_base_dn'] && $this->config['search_filter']
&& (strstr($bind_dn, '%dn') || strstr($base_dn, '%dn') || strstr($groups_base_dn, '%dn'))
) {
$search_attribs = array('uid');
if ($search_bind_attrib = (array) $this->config['search_bind_attrib']) {
foreach ($search_bind_attrib as $r => $attr) {
$search_attribs[] = $attr;
$replaces[$r] = '';
}
}
$search_bind_dn = strtr($this->config['search_bind_dn'], $replaces);
$search_base_dn = strtr($this->config['search_base_dn'], $replaces);
$search_filter = strtr($this->config['search_filter'], $replaces);
$cache_key = 'DN.' . md5("$host:$search_bind_dn:$search_base_dn:$search_filter:" . $this->config['search_bind_pw']);
if ($this->cache && ($dn = $this->cache->get($cache_key))) {
$replaces['%dn'] = $dn;
}
else {
$ldap = $this;
if (!empty($search_bind_dn) && !empty($this->config['search_bind_pw'])) {
// To protect from "Critical extension is unavailable" error
// we need to use a separate LDAP connection
if (!empty($this->config['vlv'])) {
$ldap = new rcube_ldap_generic($this->config);
$ldap->config_set(array('cache' => $this->cache, 'debug' => $this->debug));
if (!$ldap->connect($host)) {
continue;
}
}
if (!$ldap->bind($search_bind_dn, $this->config['search_bind_pw'])) {
continue; // bind failed, try next host
}
}
$res = $ldap->search($search_base_dn, $search_filter, 'sub', $search_attribs);
if ($res) {
$res->rewind();
$replaces['%dn'] = key($res->entries(true));
// add more replacements from 'search_bind_attrib' config
if ($search_bind_attrib) {
$res = $res->current();
foreach ($search_bind_attrib as $r => $attr) {
$replaces[$r] = $res[$attr][0];
}
}
}
if ($ldap != $this) {
$ldap->close();
}
}
// DN not found
if (empty($replaces['%dn'])) {
if (!empty($this->config['search_dn_default']))
$replaces['%dn'] = $this->config['search_dn_default'];
else {
rcube::raise_error(array(
'code' => 100, 'type' => 'ldap',
'file' => __FILE__, 'line' => __LINE__,
'message' => "DN not found using LDAP search."), true);
continue;
}
}
if ($this->cache && !empty($replaces['%dn'])) {
$this->cache->set($cache_key, $replaces['%dn']);
}
}
// Replace the bind_dn and base_dn variables.
$bind_dn = strtr($bind_dn, $replaces);
$base_dn = strtr($base_dn, $replaces);
$groups_base_dn = strtr($groups_base_dn, $replaces);
// replace placeholders in filter settings
if (!empty($this->config['filter'])) {
$this->config['filter'] = strtr($this->config['filter'], $replaces);
}
foreach (array('base_dn', 'filter', 'member_filter') as $k) {
if (!empty($this->config['groups'][$k])) {
$this->config['groups'][$k] = strtr($this->config['groups'][$k], $replaces);
}
}
if (empty($bind_user)) {
$bind_user = $u;
}
}
if (empty($bind_pass)) {
$this->ready = true;
}
else {
if (!empty($this->config['auth_cid'])) {
$this->ready = $this->sasl_bind($this->config['auth_cid'], $bind_pass, $bind_dn);
}
else if (!empty($bind_dn)) {
$this->ready = $this->bind($bind_dn, $bind_pass);
}
else {
$this->ready = $this->sasl_bind($bind_user, $bind_pass);
}
}
// connection established, we're done here
if ($this->ready) {
break;
}
} // end foreach hosts
if (!is_resource($this->conn)) {
rcube::raise_error(array('code' => 100, 'type' => 'ldap',
'file' => __FILE__, 'line' => __LINE__,
'message' => "Could not connect to any LDAP server, last tried $host"), true);
$this->ready = false;
}
return $this->ready;
}
/**
* Fetches user data from LDAP addressbook
*/
function get_user_record($user, $host)
{
$rcmail = rcube::get_instance();
$filter = $rcmail->config->get('kolab_auth_filter');
$filter = $this->parse_vars($filter, $user, $host);
$base_dn = $this->parse_vars($this->config['base_dn'], $user, $host);
$scope = $this->config['scope'];
// @TODO: print error if filter is empty
// get record
if ($result = parent::search($base_dn, $filter, $scope, $this->attributes)) {
if ($result->count() == 1) {
$entries = $result->entries(true);
$dn = key($entries);
$entry = array_pop($entries);
$entry = $this->field_mapping($dn, $entry);
return $entry;
}
}
}
/**
* Fetches user data from LDAP addressbook
*/
function get_user_groups($dn, $user, $host)
{
if (empty($dn) || empty($this->config['groups'])) {
return array();
}
$base_dn = $this->parse_vars($this->config['groups']['base_dn'], $user, $host);
$name_attr = $this->config['groups']['name_attr'] ? $this->config['groups']['name_attr'] : 'cn';
$member_attr = $this->get_group_member_attr();
$filter = "(member=$dn)(uniqueMember=$dn)";
if ($member_attr != 'member' && $member_attr != 'uniqueMember')
$filter .= "($member_attr=$dn)";
$filter = strtr("(|$filter)", array("\\" => "\\\\"));
$result = parent::search($base_dn, $filter, 'sub', array('dn', $name_attr));
if (!$result) {
return array();
}
$groups = array();
foreach ($result as $entry) {
$dn = $entry['dn'];
$entry = rcube_ldap_generic::normalize_entry($entry);
$groups[$dn] = $entry[$name_attr];
}
return $groups;
}
/**
* Get a specific LDAP record
*
* @param string DN
*
* @return array Record data
*/
function get_record($dn)
{
if (!$this->ready) {
return;
}
if ($rec = $this->get_entry($dn, $this->attributes)) {
$rec = rcube_ldap_generic::normalize_entry($rec);
$rec = $this->field_mapping($dn, $rec);
}
return $rec;
}
/**
* Replace LDAP record data items
*
* @param string $dn DN
* @param array $entry LDAP entry
*
* return bool True on success, False on failure
*/
function replace($dn, $entry)
{
// fields mapping
foreach ($this->fieldmap as $field => $attr) {
if (array_key_exists($field, $entry)) {
$entry[$attr] = $entry[$field];
if ($attr != $field) {
unset($entry[$field]);
}
}
}
return $this->mod_replace($dn, $entry);
}
/**
* Search records (simplified version of rcube_ldap::search)
*
* @param mixed $fields The field name or array of field names to search in
* @param string $value Search value
* @param int $mode Matching mode:
* 0 - partial (*abc*),
* 1 - strict (=),
* 2 - prefix (abc*)
* @param array $required List of fields that cannot be empty
* @param int $limit Number of records
* @param int $count Returns the number of records found
*
* @return array List of LDAP records found
*/
function dosearch($fields, $value, $mode=1, $required = array(), $limit = 0, &$count = 0)
{
if (empty($fields)) {
return array();
}
$mode = intval($mode);
// try to resolve field names into ldap attributes
$fieldmap = $this->fieldmap;
$attrs = array_map(function($f) use ($fieldmap) {
return array_key_exists($f, $fieldmap) ? $fieldmap[$f] : $f;
}, (array)$fields);
// compose a full-text-search-like filter
if (count($attrs) > 1 || $mode != 1) {
$filter = self::fulltext_search_filter($value, $attrs, $mode);
}
// direct search
else {
$field = $attrs[0];
$filter = "($field=" . self::quote_string($value) . ")";
}
// add required (non empty) fields filter
$req_filter = '';
foreach ((array)$required as $field) {
$attr = array_key_exists($field, $this->fieldmap) ? $this->fieldmap[$field] : $field;
// only add if required field is not already in search filter
if (!in_array($attr, $attrs)) {
$req_filter .= "($attr=*)";
}
}
if (!empty($req_filter)) {
$filter = '(&' . $req_filter . $filter . ')';
}
// avoid double-wildcard if $value is empty
$filter = preg_replace('/\*+/', '*', $filter);
// add general filter to query
if (!empty($this->config['filter'])) {
$filter = '(&(' . preg_replace('/^\(|\)$/', '', $this->config['filter']) . ')' . $filter . ')';
}
$base_dn = $this->parse_vars($this->config['base_dn']);
$scope = $this->config['scope'];
$attrs = array_values($this->fieldmap);
$list = array();
if ($result = $this->search($base_dn, $filter, $scope, $attrs)) {
$count = $result->count();
$i = 0;
foreach ($result as $entry) {
if ($limit && $limit <= $i) {
break;
}
$dn = $entry['dn'];
$entry = rcube_ldap_generic::normalize_entry($entry);
$list[$dn] = $this->field_mapping($dn, $entry);
$i++;
}
}
return $list;
}
/**
* Set filter used in search()
*/
function set_filter($filter)
{
$this->config['filter'] = $filter;
}
/**
* Maps LDAP attributes to defined fields
*/
protected function field_mapping($dn, $entry)
{
$entry['dn'] = $dn;
// fields mapping
foreach ($this->fieldmap as $field => $attr) {
// $entry might be indexed by lower-case attribute names
$attr_lc = strtolower($attr);
if (isset($entry[$attr_lc])) {
$entry[$field] = $entry[$attr_lc];
}
else if (isset($entry[$attr])) {
$entry[$field] = $entry[$attr];
}
}
// compose display name according to config
if (empty($this->fieldmap['displayname'])) {
$entry['displayname'] = rcube_addressbook::compose_search_name(
$entry,
$entry['email'],
$entry['name'],
$this->conf['kolab_auth_user_displayname']
);
}
return $entry;
}
/**
* Detects group member attribute name
*/
private function get_group_member_attr($object_classes = array())
{
if (empty($object_classes)) {
$object_classes = $this->config['groups']['object_classes'];
}
if (!empty($object_classes)) {
foreach ((array)$object_classes as $oc) {
switch (strtolower($oc)) {
case 'group':
case 'groupofnames':
case 'kolabgroupofnames':
$member_attr = 'member';
break;
case 'groupofuniquenames':
case 'kolabgroupofuniquenames':
$member_attr = 'uniqueMember';
break;
}
}
}
if (!empty($member_attr)) {
return $member_attr;
}
if (!empty($this->config['groups']['member_attr'])) {
return $this->config['groups']['member_attr'];
}
return 'member';
}
/**
* Prepares filter query for LDAP search
*/
function parse_vars($str, $user = null, $host = null)
{
// When authenticating user $user is always set
// if not set it means we use this LDAP object for other
// purposes, e.g. kolab_delegation, then username with
// correct domain is in a session
if (!$user) {
$user = $_SESSION['username'];
}
if (isset($this->icache[$user])) {
list($user, $dc) = $this->icache[$user];
}
else {
$orig_user = $user;
$rcmail = rcube::get_instance();
// get default domain
if ($username_domain = $rcmail->config->get('username_domain')) {
if ($host && is_array($username_domain) && isset($username_domain[$host])) {
$domain = rcube_utils::parse_host($username_domain[$host], $host);
}
else if (is_string($username_domain)) {
$domain = rcube_utils::parse_host($username_domain, $host);
}
}
// realmed username (with domain)
if (strpos($user, '@')) {
list($usr, $dom) = explode('@', $user);
// unrealm domain, user login can contain a domain alias
if ($dom != $domain && ($dc = $this->domain_root_dn($dom))) {
// @FIXME: we should replace domain in $user, I suppose
}
}
else if ($domain) {
$user .= '@' . $domain;
}
$this->icache[$orig_user] = array($user, $dc);
}
// replace variables in filter
list($u, $d) = explode('@', $user);
// hierarchal domain string
if (empty($dc)) {
$dc = 'dc=' . strtr($d, array('.' => ',dc='));
}
$replaces = array('%dc' => $dc, '%d' => $d, '%fu' => $user, '%u' => $u);
$this->parse_replaces = $replaces;
return strtr($str, $replaces);
}
/**
* Returns variables used for replacement in (last) parse_vars() call
*
* @return array Variable-value hash array
*/
public function get_parse_vars()
{
return $this->parse_replaces;
}
/**
* Register additional fields
*/
public function extend_fieldmap($map)
{
foreach ((array)$map as $name => $attr) {
if (!in_array($attr, $this->attributes)) {
$this->attributes[] = $attr;
$this->fieldmap[$name] = $attr;
}
}
}
/**
* HTML-safe DN string encoding
*
* @param string $str DN string
*
* @return string Encoded HTML identifier string
*/
static function dn_encode($str)
{
return rtrim(strtr(base64_encode($str), '+/', '-_'), '=');
}
/**
* Decodes DN string encoded with _dn_encode()
*
* @param string $str Encoded HTML identifier string
*
* @return string DN string
*/
static function dn_decode($str)
{
$str = str_pad(strtr($str, '-_', '+/'), strlen($str) % 4, '=', STR_PAD_RIGHT);
return base64_decode($str);
}
}

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