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LDAP.php
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LDAP.php
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<?php
/**
* Storage backend to store 2-Factor-Authentication settings in LDAP
*
* @author Thomas Bruederli <bruederli@kolabsys.com>
*
* Copyright (C) 2015, 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/>.
*/
namespace Kolab2FA\Storage;
use \Net_LDAP3;
use \Kolab2FA\Log\Logger;
class LDAP extends Base
{
public $userdn;
private $cache = array();
private $ldapcache = array();
private $conn;
private $error;
public function init(array $config)
{
parent::init($config);
$this->conn = new Net_LDAP3($config);
$this->conn->config_set('log_hook', array($this, 'log'));
$this->conn->connect();
$bind_pass = $this->config['bind_pass'];
$bind_user = $this->config['bind_user'];
$bind_dn = $this->config['bind_dn'];
$this->ready = $this->conn->bind($bind_dn, $bind_pass);
if (!$this->ready) {
throw new Exception("LDAP storage not ready: " . $this->error);
}
}
/**
* List/set methods activated for this user
*/
public function enumerate($active = true)
{
$filter = $this->parse_vars($this->config['filter'], '*');
$base_dn = $this->parse_vars($this->config['base_dn'], '*');
$scope = $this->config['scope'] ?: 'sub';
$ids = array();
if ($this->ready && ($result = $this->conn->search($base_dn, $filter, $scope, array($this->config['fieldmap']['id'], $this->config['fieldmap']['active'])))) {
foreach ($result as $dn => $entry) {
$rec = $this->field_mapping($dn, Net_LDAP3::normalize_entry($entry, true));
if (!empty($rec['id']) && ($active === null || $active == $rec['active'])) {
$ids[] = $rec['id'];
}
}
}
// TODO: cache this in memory
return $ids;
}
/**
* Read data for the given key
*/
public function read($key)
{
if (!isset($this->cache[$key])) {
$this->cache[$key] = $this->get_ldap_record($this->username, $key);
}
return $this->cache[$key];
}
/**
* Save data for the given key
*/
public function write($key, $value)
{
$success = false;
$ldap_attrs = array();
if (is_array($value)) {
// add some default values
$value += (array)$this->config['defaults'] + array('active' => false, 'username' => $this->username, 'userdn' => $this->userdn);
foreach ($value as $k => $val) {
if ($attr = $this->config['fieldmap'][$k]) {
$ldap_attrs[$attr] = $this->value_mapping($k, $val, false);
}
}
}
else {
// invalid data structure
return false;
}
// update existing record
if ($rec = $this->get_ldap_record($this->username, $key)) {
$old_attrs = $rec['_raw'];
$new_attrs = array_merge($old_attrs, $ldap_attrs);
$result = $this->conn->modify_entry($rec['_dn'], $old_attrs, $new_attrs);
$success = !empty($result);
}
// insert new record
else if ($this->ready) {
$entry_dn = $this->get_entry_dn($this->username, $key);
// add object class attribute
$me = $this;
$ldap_attrs['objectclass'] = array_map(function($cls) use ($me, $key) {
return $me->parse_vars($cls, $key);
}, (array)$this->config['objectclass']);
$success = $this->conn->add_entry($entry_dn, $ldap_attrs);
}
if ($success) {
$this->cache[$key] = $value;
$this->ldapcache = array();
// cleanup: remove disabled/inactive/temporary entries
if ($value['active']) {
foreach ($this->enumerate(false) as $id) {
if ($id != $key) {
$this->remove($id);
}
}
// set user roles according to active factors
$this->set_user_roles();
}
}
return $success;
}
/**
* Remove the data stored for the given key
*/
public function remove($key)
{
if ($this->ready) {
$entry_dn = $this->get_entry_dn($this->username, $key);
$success = $this->conn->delete_entry($entry_dn);
// set user roles according to active factors
if ($success) {
$this->set_user_roles();
}
return $success;
}
return false;
}
/**
* Set username to store data for
*/
public function set_username($username)
{
parent::set_username($username);
// reset cached values
$this->cache = array();
$this->ldapcache = array();
}
/**
*
*/
protected function set_user_roles()
{
if (!$this->ready || !$this->userdn || empty($this->config['user_roles'])) {
return false;
}
$auth_roles = array();
foreach ($this->enumerate(true) as $id) {
foreach ($this->config['user_roles'] as $prefix => $role) {
if (strpos($id, $prefix) === 0) {
$auth_roles[] = $role;
}
}
}
$role_attr = $this->config['fieldmap']['roles'] ?: 'nsroledn';
if ($user_attrs = $this->conn->get_entry($this->userdn, array($role_attr))) {
$internals = array_values($this->config['user_roles']);
$new_attrs = $old_attrs = Net_LDAP3::normalize_entry($user_attrs);
$new_attrs[$role_attr] = array_merge(
array_unique($auth_roles),
array_filter((array)$old_attrs[$role_attr], function($f) use ($internals) { return !in_array($f, $internals); })
);
$result = $this->conn->modify_entry($this->userdn, $old_attrs, $new_attrs);
return !empty($result);
}
return false;
}
/**
* Fetches user data from LDAP addressbook
*/
protected function get_ldap_record($user, $key)
{
$entry_dn = $this->get_entry_dn($user, $key);
if (!isset($this->ldapcache[$entry_dn])) {
$this->ldapcache[$entry_dn] = array();
if ($this->ready && ($entry = $this->conn->get_entry($entry_dn, array_values($this->config['fieldmap'])))) {
$this->ldapcache[$entry_dn] = $this->field_mapping($entry_dn, Net_LDAP3::normalize_entry($entry, true));
}
}
return $this->ldapcache[$entry_dn];
}
/**
* Compose a full DN for the given record identifier
*/
protected function get_entry_dn($user, $key)
{
$base_dn = $this->parse_vars($this->config['base_dn'], $key);
return sprintf('%s=%s,%s', $this->config['rdn'], Net_LDAP3::quote_string($key, true), $base_dn);
}
/**
* Maps LDAP attributes to defined fields
*/
protected function field_mapping($dn, $entry)
{
$entry['_dn'] = $dn;
$entry['_raw'] = $entry;
// fields mapping
foreach ($this->config['fieldmap'] as $field => $attr) {
$attr_lc = strtolower($attr);
if (isset($entry[$attr_lc])) {
$entry[$field] = $this->value_mapping($field, $entry[$attr_lc], true);
}
else if (isset($entry[$attr])) {
$entry[$field] = $this->value_mapping($field, $entry[$attr], true);
}
}
return $entry;
}
/**
*
*/
protected function value_mapping($attr, $value, $reverse = false)
{
if ($map = $this->config['valuemap'][$attr]) {
if ($reverse) {
$map = array_flip($map);
}
if (is_array($value)) {
$value = array_filter(array_map(function($val) use ($map) {
return $map[$val];
}, $value));
}
else {
$value = $map[$value];
}
}
// convert (date) type
switch ($this->config['attrtypes'][$attr]) {
case 'datetime':
$ts = is_numeric($value) ? $value : strtotime($value);
if ($ts) {
$value = gmdate($reverse ? 'U' : 'YmdHi\Z', $ts);
}
break;
case 'integer':
$value = intval($value);
break;
}
return $value;
}
/**
* Prepares filter query for LDAP search
*/
protected function parse_vars($str, $key)
{
$user = $this->username;
if (strpos($user, '@') > 0) {
list($u, $d) = explode('@', $user);
}
else if ($this->userdn) {
$u = $this->userdn;
$d = trim(str_replace(',dc=', '.', substr($u, strpos($u, ',dc='))), '.');
}
if ($this->userdn) {
$user = $this->userdn;
}
// build hierarchal domain string
$dc = $this->conn->domain_root_dn($d);
$class = $this->config['classmap'] ? $this->config['classmap']['*'] : '*';
// map key to objectclass
if (is_array($this->config['classmap'])) {
foreach ($this->config['classmap'] as $k => $c) {
if (strpos($key, $k) === 0) {
$class = $c;
break;
}
}
}
$replaces = array('%dc' => $dc, '%d' => $d, '%fu' => $user, '%u' => $u, '%c' => $class);
return strtr($str, $replaces);
}
}

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LDAP.php (10 KB)

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