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moodle/auth/ldap/auth.php

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<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
/**
* Authentication Plugin: LDAP Authentication
* Authentication using LDAP (Lightweight Directory Access Protocol).
*
* @package auth_ldap
* @author Martin Dougiamas
* @author Iñaki Arenaza
* @license http://www.gnu.org/copyleft/gpl.html GNU Public License
*/
defined('MOODLE_INTERNAL') || die();
// See http://support.microsoft.com/kb/305144 to interprete these values.
if (!defined('AUTH_AD_ACCOUNTDISABLE')) {
define('AUTH_AD_ACCOUNTDISABLE', 0x0002);
}
if (!defined('AUTH_AD_NORMAL_ACCOUNT')) {
define('AUTH_AD_NORMAL_ACCOUNT', 0x0200);
}
if (!defined('AUTH_NTLMTIMEOUT')) { // timewindow for the NTLM SSO process, in secs...
define('AUTH_NTLMTIMEOUT', 10);
}
// UF_DONT_EXPIRE_PASSWD value taken from MSDN directly
if (!defined('UF_DONT_EXPIRE_PASSWD')) {
define ('UF_DONT_EXPIRE_PASSWD', 0x00010000);
}
// The Posix uid and gid of the 'nobody' account and 'nogroup' group.
if (!defined('AUTH_UID_NOBODY')) {
define('AUTH_UID_NOBODY', -2);
}
if (!defined('AUTH_GID_NOGROUP')) {
define('AUTH_GID_NOGROUP', -2);
}
// Regular expressions for a valid NTLM username and domain name.
if (!defined('AUTH_NTLM_VALID_USERNAME')) {
define('AUTH_NTLM_VALID_USERNAME', '[^/\\\\\\\\\[\]:;|=,+*?<>@"]+');
}
if (!defined('AUTH_NTLM_VALID_DOMAINNAME')) {
define('AUTH_NTLM_VALID_DOMAINNAME', '[^\\\\\\\\\/:*?"<>|]+');
}
// Default format for remote users if using NTLM SSO
if (!defined('AUTH_NTLM_DEFAULT_FORMAT')) {
define('AUTH_NTLM_DEFAULT_FORMAT', '%domain%\\%username%');
}
if (!defined('AUTH_NTLM_FASTPATH_ATTEMPT')) {
define('AUTH_NTLM_FASTPATH_ATTEMPT', 0);
}
if (!defined('AUTH_NTLM_FASTPATH_YESFORM')) {
define('AUTH_NTLM_FASTPATH_YESFORM', 1);
}
if (!defined('AUTH_NTLM_FASTPATH_YESATTEMPT')) {
define('AUTH_NTLM_FASTPATH_YESATTEMPT', 2);
}
// Allows us to retrieve a diagnostic message in case of LDAP operation error
if (!defined('LDAP_OPT_DIAGNOSTIC_MESSAGE')) {
define('LDAP_OPT_DIAGNOSTIC_MESSAGE', 0x0032);
}
require_once($CFG->libdir.'/authlib.php');
require_once($CFG->libdir.'/ldaplib.php');
require_once($CFG->dirroot.'/user/lib.php');
require_once($CFG->dirroot.'/auth/ldap/locallib.php');
/**
* LDAP authentication plugin.
*/
class auth_plugin_ldap extends auth_plugin_base {
/**
* Init plugin config from database settings depending on the plugin auth type.
*/
function init_plugin($authtype) {
$this->pluginconfig = 'auth_'.$authtype;
$this->config = get_config($this->pluginconfig);
if (empty($this->config->ldapencoding)) {
$this->config->ldapencoding = 'utf-8';
}
if (empty($this->config->user_type)) {
$this->config->user_type = 'default';
}
$ldap_usertypes = ldap_supported_usertypes();
$this->config->user_type_name = $ldap_usertypes[$this->config->user_type];
unset($ldap_usertypes);
$default = ldap_getdefaults();
// Use defaults if values not given
foreach ($default as $key => $value) {
// watch out - 0, false are correct values too
if (!isset($this->config->{$key}) or $this->config->{$key} == '') {
$this->config->{$key} = $value[$this->config->user_type];
}
}
// Hack prefix to objectclass
$this->config->objectclass = ldap_normalise_objectclass($this->config->objectclass);
}
/**
* Constructor with initialisation.
*/
public function __construct() {
$this->authtype = 'ldap';
$this->roleauth = 'auth_ldap';
$this->errorlogtag = '[AUTH LDAP] ';
$this->init_plugin($this->authtype);
}
/**
* Old syntax of class constructor. Deprecated in PHP7.
*
* @deprecated since Moodle 3.1
*/
public function auth_plugin_ldap() {
debugging('Use of class name as constructor is deprecated', DEBUG_DEVELOPER);
self::__construct();
}
/**
* Returns true if the username and password work and false if they are
* wrong or don't exist.
*
* @param string $username The username (without system magic quotes)
* @param string $password The password (without system magic quotes)
*
* @return bool Authentication success or failure.
*/
function user_login($username, $password) {
if (! function_exists('ldap_bind')) {
print_error('auth_ldapnotinstalled', 'auth_ldap');
return false;
}
if (!$username or !$password) { // Don't allow blank usernames or passwords
return false;
}
$extusername = core_text::convert($username, 'utf-8', $this->config->ldapencoding);
$extpassword = core_text::convert($password, 'utf-8', $this->config->ldapencoding);
// Before we connect to LDAP, check if this is an AD SSO login
// if we succeed in this block, we'll return success early.
//
$key = sesskey();
if (!empty($this->config->ntlmsso_enabled) && $key === $password) {
$sessusername = get_cache_flag($this->pluginconfig.'/ntlmsess', $key);
// We only get the cache flag if we retrieve it before
// it expires (AUTH_NTLMTIMEOUT seconds).
if (empty($sessusername)) {
return false;
}
if ($username === $sessusername) {
unset($sessusername);
// Check that the user is inside one of the configured LDAP contexts
$validuser = false;
$ldapconnection = $this->ldap_connect();
// if the user is not inside the configured contexts,
// ldap_find_userdn returns false.
if ($this->ldap_find_userdn($ldapconnection, $extusername)) {
$validuser = true;
}
$this->ldap_close();
// Shortcut here - SSO confirmed
return $validuser;
}
} // End SSO processing
unset($key);
$ldapconnection = $this->ldap_connect();
$ldap_user_dn = $this->ldap_find_userdn($ldapconnection, $extusername);
// If ldap_user_dn is empty, user does not exist
if (!$ldap_user_dn) {
$this->ldap_close();
return false;
}
// Try to bind with current username and password
$ldap_login = @ldap_bind($ldapconnection, $ldap_user_dn, $extpassword);
// If login fails and we are using MS Active Directory, retrieve the diagnostic
// message to see if this is due to an expired password, or that the user is forced to
// change the password on first login. If it is, only proceed if we can change
// password from Moodle (otherwise we'll get stuck later in the login process).
if (!$ldap_login && ($this->config->user_type == 'ad')
&& $this->can_change_password()
&& (!empty($this->config->expiration) and ($this->config->expiration == 1))) {
// We need to get the diagnostic message right after the call to ldap_bind(),
// before any other LDAP operation.
ldap_get_option($ldapconnection, LDAP_OPT_DIAGNOSTIC_MESSAGE, $diagmsg);
if ($this->ldap_ad_pwdexpired_from_diagmsg($diagmsg)) {
// If login failed because user must change the password now or the
// password has expired, let the user in. We'll catch this later in the
// login process when we explicitly check for expired passwords.
$ldap_login = true;
}
}
$this->ldap_close();
return $ldap_login;
}
/**
* Reads user information from ldap and returns it in array()
*
* Function should return all information available. If you are saving
* this information to moodle user-table you should honor syncronization flags
*
* @param string $username username
*
* @return mixed array with no magic quotes or false on error
*/
function get_userinfo($username) {
$extusername = core_text::convert($username, 'utf-8', $this->config->ldapencoding);
$ldapconnection = $this->ldap_connect();
if(!($user_dn = $this->ldap_find_userdn($ldapconnection, $extusername))) {
$this->ldap_close();
return false;
}
$search_attribs = array();
$attrmap = $this->ldap_attributes();
foreach ($attrmap as $key => $values) {
if (!is_array($values)) {
$values = array($values);
}
foreach ($values as $value) {
if (!in_array($value, $search_attribs)) {
array_push($search_attribs, $value);
}
}
}
if (!$user_info_result = ldap_read($ldapconnection, $user_dn, '(objectClass=*)', $search_attribs)) {
$this->ldap_close();
return false; // error!
}
$user_entry = ldap_get_entries_moodle($ldapconnection, $user_info_result);
if (empty($user_entry)) {
$this->ldap_close();
return false; // entry not found
}
$result = array();
foreach ($attrmap as $key => $values) {
if (!is_array($values)) {
$values = array($values);
}
$ldapval = NULL;
foreach ($values as $value) {
$entry = $user_entry[0];
if (($value == 'dn') || ($value == 'distinguishedname')) {
$result[$key] = $user_dn;
continue;
}
if (!array_key_exists($value, $entry)) {
continue; // wrong data mapping!
}
if (is_array($entry[$value])) {
$newval = core_text::convert($entry[$value][0], $this->config->ldapencoding, 'utf-8');
} else {
$newval = core_text::convert($entry[$value], $this->config->ldapencoding, 'utf-8');
}
if (!empty($newval)) { // favour ldap entries that are set
$ldapval = $newval;
}
}
if (!is_null($ldapval)) {
$result[$key] = $ldapval;
}
}
$this->ldap_close();
return $result;
}
/**
* Reads user information from ldap and returns it in an object
*
* @param string $username username (with system magic quotes)
* @return mixed object or false on error
*/
function get_userinfo_asobj($username) {
$user_array = $this->get_userinfo($username);
if ($user_array == false) {
return false; //error or not found
}
$user_array = truncate_userinfo($user_array);
$user = new stdClass();
foreach ($user_array as $key=>$value) {
$user->{$key} = $value;
}
return $user;
}
/**
* Returns all usernames from LDAP
*
* get_userlist returns all usernames from LDAP
*
* @return array
*/
function get_userlist() {
return $this->ldap_get_userlist("({$this->config->user_attribute}=*)");
}
/**
* Checks if user exists on LDAP
*
* @param string $username
*/
function user_exists($username) {
$extusername = core_text::convert($username, 'utf-8', $this->config->ldapencoding);
// Returns true if given username exists on ldap
$users = $this->ldap_get_userlist('('.$this->config->user_attribute.'='.ldap_filter_addslashes($extusername).')');
return count($users);
}
/**
* Creates a new user on LDAP.
* By using information in userobject
* Use user_exists to prevent duplicate usernames
*
* @param mixed $userobject Moodle userobject
* @param mixed $plainpass Plaintext password
*/
function user_create($userobject, $plainpass) {
$extusername = core_text::convert($userobject->username, 'utf-8', $this->config->ldapencoding);
$extpassword = core_text::convert($plainpass, 'utf-8', $this->config->ldapencoding);
switch ($this->config->passtype) {
case 'md5':
$extpassword = '{MD5}' . base64_encode(pack('H*', md5($extpassword)));
break;
case 'sha1':
$extpassword = '{SHA}' . base64_encode(pack('H*', sha1($extpassword)));
break;
case 'plaintext':
default:
break; // plaintext
}
$ldapconnection = $this->ldap_connect();
$attrmap = $this->ldap_attributes();
$newuser = array();
foreach ($attrmap as $key => $values) {
if (!is_array($values)) {
$values = array($values);
}
foreach ($values as $value) {
if (!empty($userobject->$key) ) {
$newuser[$value] = core_text::convert($userobject->$key, 'utf-8', $this->config->ldapencoding);
}
}
}
//Following sets all mandatory and other forced attribute values
//User should be creted as login disabled untill email confirmation is processed
//Feel free to add your user type and send patches to paca@sci.fi to add them
//Moodle distribution
switch ($this->config->user_type) {
case 'edir':
$newuser['objectClass'] = array('inetOrgPerson', 'organizationalPerson', 'person', 'top');
$newuser['uniqueId'] = $extusername;
$newuser['logindisabled'] = 'TRUE';
$newuser['userpassword'] = $extpassword;
$uadd = ldap_add($ldapconnection, $this->config->user_attribute.'='.ldap_addslashes($extusername).','.$this->config->create_context, $newuser);
break;
case 'rfc2307':
case 'rfc2307bis':
// posixAccount object class forces us to specify a uidNumber
// and a gidNumber. That is quite complicated to generate from
// Moodle without colliding with existing numbers and without
// race conditions. As this user is supposed to be only used
// with Moodle (otherwise the user would exist beforehand) and
// doesn't need to login into a operating system, we assign the
// user the uid of user 'nobody' and gid of group 'nogroup'. In
// addition to that, we need to specify a home directory. We
// use the root directory ('/') as the home directory, as this
// is the only one can always be sure exists. Finally, even if
// it's not mandatory, we specify '/bin/false' as the login
// shell, to prevent the user from login in at the operating
// system level (Moodle ignores this).
$newuser['objectClass'] = array('posixAccount', 'inetOrgPerson', 'organizationalPerson', 'person', 'top');
$newuser['cn'] = $extusername;
$newuser['uid'] = $extusername;
$newuser['uidNumber'] = AUTH_UID_NOBODY;
$newuser['gidNumber'] = AUTH_GID_NOGROUP;
$newuser['homeDirectory'] = '/';
$newuser['loginShell'] = '/bin/false';
// IMPORTANT:
// We have to create the account locked, but posixAccount has
// no attribute to achive this reliably. So we are going to
// modify the password in a reversable way that we can later
// revert in user_activate().
//
// Beware that this can be defeated by the user if we are not
// using MD5 or SHA-1 passwords. After all, the source code of
// Moodle is available, and the user can see the kind of
// modification we are doing and 'undo' it by hand (but only
// if we are using plain text passwords).
//
// Also bear in mind that you need to use a binding user that
// can create accounts and has read/write privileges on the
// 'userPassword' attribute for this to work.
$newuser['userPassword'] = '*'.$extpassword;
$uadd = ldap_add($ldapconnection, $this->config->user_attribute.'='.ldap_addslashes($extusername).','.$this->config->create_context, $newuser);
break;
case 'ad':
// User account creation is a two step process with AD. First you
// create the user object, then you set the password. If you try
// to set the password while creating the user, the operation
// fails.
// Passwords in Active Directory must be encoded as Unicode
// strings (UCS-2 Little Endian format) and surrounded with
// double quotes. See http://support.microsoft.com/?kbid=269190
if (!function_exists('mb_convert_encoding')) {
print_error('auth_ldap_no_mbstring', 'auth_ldap');
}
// Check for invalid sAMAccountName characters.
if (preg_match('#[/\\[\]:;|=,+*?<>@"]#', $extusername)) {
print_error ('auth_ldap_ad_invalidchars', 'auth_ldap');
}
// First create the user account, and mark it as disabled.
$newuser['objectClass'] = array('top', 'person', 'user', 'organizationalPerson');
$newuser['sAMAccountName'] = $extusername;
$newuser['userAccountControl'] = AUTH_AD_NORMAL_ACCOUNT |
AUTH_AD_ACCOUNTDISABLE;
$userdn = 'cn='.ldap_addslashes($extusername).','.$this->config->create_context;
if (!ldap_add($ldapconnection, $userdn, $newuser)) {
print_error('auth_ldap_ad_create_req', 'auth_ldap');
}
// Now set the password
unset($newuser);
$newuser['unicodePwd'] = mb_convert_encoding('"' . $extpassword . '"',
'UCS-2LE', 'UTF-8');
if(!ldap_modify($ldapconnection, $userdn, $newuser)) {
// Something went wrong: delete the user account and error out
ldap_delete ($ldapconnection, $userdn);
print_error('auth_ldap_ad_create_req', 'auth_ldap');
}
$uadd = true;
break;
default:
print_error('auth_ldap_unsupportedusertype', 'auth_ldap', '', $this->config->user_type_name);
}
$this->ldap_close();
return $uadd;
}
/**
* Returns true if plugin allows resetting of password from moodle.
*
* @return bool
*/
function can_reset_password() {
return !empty($this->config->stdchangepassword);
}
/**
* Returns true if plugin can be manually set.
*
* @return bool
*/
function can_be_manually_set() {
return true;
}
/**
* Returns true if plugin allows signup and user creation.
*
* @return bool
*/
function can_signup() {
return (!empty($this->config->auth_user_create) and !empty($this->config->create_context));
}
/**
* Sign up a new user ready for confirmation.
* Password is passed in plaintext.
*
* @param object $user new user object
* @param boolean $notify print notice with link and terminate
* @return boolean success
*/
function user_signup($user, $notify=true) {
global $CFG, $DB, $PAGE, $OUTPUT;
require_once($CFG->dirroot.'/user/profile/lib.php');
require_once($CFG->dirroot.'/user/lib.php');
if ($this->user_exists($user->username)) {
print_error('auth_ldap_user_exists', 'auth_ldap');
}
$plainslashedpassword = $user->password;
unset($user->password);
if (! $this->user_create($user, $plainslashedpassword)) {
print_error('auth_ldap_create_error', 'auth_ldap');
}
$user->id = user_create_user($user, false, false);
user_add_password_history($user->id, $plainslashedpassword);
// Save any custom profile field information
profile_save_data($user);
$userinfo = $this->get_userinfo($user->username);
$this->update_user_record($user->username, false, false, $this->is_user_suspended((object) $userinfo));
// This will also update the stored hash to the latest algorithm
// if the existing hash is using an out-of-date algorithm (or the
// legacy md5 algorithm).
update_internal_user_password($user, $plainslashedpassword);
$user = $DB->get_record('user', array('id'=>$user->id));
\core\event\user_created::create_from_userid($user->id)->trigger();
if (! send_confirmation_email($user)) {
print_error('noemail', 'auth_ldap');
}
if ($notify) {
$emailconfirm = get_string('emailconfirm');
$PAGE->set_url('/auth/ldap/auth.php');
$PAGE->navbar->add($emailconfirm);
$PAGE->set_title($emailconfirm);
$PAGE->set_heading($emailconfirm);
echo $OUTPUT->header();
notice(get_string('emailconfirmsent', '', $user->email), "{$CFG->wwwroot}/index.php");
} else {
return true;
}
}
/**
* Returns true if plugin allows confirming of new users.
*
* @return bool
*/
function can_confirm() {
return $this->can_signup();
}
/**
* Confirm the new user as registered.
*
* @param string $username
* @param string $confirmsecret
*/
function user_confirm($username, $confirmsecret) {
global $DB;
$user = get_complete_user_data('username', $username);
if (!empty($user)) {
if ($user->auth != $this->authtype) {
return AUTH_CONFIRM_ERROR;
} else if ($user->secret == $confirmsecret && $user->confirmed) {
return AUTH_CONFIRM_ALREADY;
} else if ($user->secret == $confirmsecret) { // They have provided the secret key to get in
if (!$this->user_activate($username)) {
return AUTH_CONFIRM_FAIL;
}
$user->confirmed = 1;
user_update_user($user, false);
return AUTH_CONFIRM_OK;
}
} else {
return AUTH_CONFIRM_ERROR;
}
}
/**
* Return number of days to user password expires
*
* If userpassword does not expire it should return 0. If password is already expired
* it should return negative value.
*
* @param mixed $username username
* @return integer
*/
function password_expire($username) {
$result = 0;
$extusername = core_text::convert($username, 'utf-8', $this->config->ldapencoding);
$ldapconnection = $this->ldap_connect();
$user_dn = $this->ldap_find_userdn($ldapconnection, $extusername);
$search_attribs = array($this->config->expireattr);
$sr = ldap_read($ldapconnection, $user_dn, '(objectClass=*)', $search_attribs);
if ($sr) {
$info = ldap_get_entries_moodle($ldapconnection, $sr);
if (!empty ($info)) {
$info = $info[0];
if (isset($info[$this->config->expireattr][0])) {
$expiretime = $this->ldap_expirationtime2unix($info[$this->config->expireattr][0], $ldapconnection, $user_dn);
if ($expiretime != 0) {
$now = time();
if ($expiretime > $now) {
$result = ceil(($expiretime - $now) / DAYSECS);
} else {
$result = floor(($expiretime - $now) / DAYSECS);
}
}
}
}
} else {
error_log($this->errorlogtag.get_string('didtfindexpiretime', 'auth_ldap'));
}
return $result;
}
/**
* Syncronizes user fron external LDAP server to moodle user table
*
* Sync is now using username attribute.
*
* Syncing users removes or suspends users that dont exists anymore in external LDAP.
* Creates new users and updates coursecreator status of users.
*
* @param bool $do_updates will do pull in data updates from LDAP if relevant
*/
function sync_users($do_updates=true) {
global $CFG, $DB;
require_once($CFG->dirroot . '/user/profile/lib.php');
print_string('connectingldap', 'auth_ldap');
$ldapconnection = $this->ldap_connect();
$dbman = $DB->get_manager();
/// Define table user to be created
$table = new xmldb_table('tmp_extuser');
$table->add_field('id', XMLDB_TYPE_INTEGER, '10', XMLDB_UNSIGNED, XMLDB_NOTNULL, XMLDB_SEQUENCE, null);
$table->add_field('username', XMLDB_TYPE_CHAR, '100', null, XMLDB_NOTNULL, null, null);
$table->add_field('mnethostid', XMLDB_TYPE_INTEGER, '10', XMLDB_UNSIGNED, XMLDB_NOTNULL, null, null);
$table->add_key('primary', XMLDB_KEY_PRIMARY, array('id'));
$table->add_index('username', XMLDB_INDEX_UNIQUE, array('mnethostid', 'username'));
print_string('creatingtemptable', 'auth_ldap', 'tmp_extuser');
$dbman->create_temp_table($table);
////
//// get user's list from ldap to sql in a scalable fashion
////
// prepare some data we'll need
$filter = '(&('.$this->config->user_attribute.'=*)'.$this->config->objectclass.')';
$contexts = explode(';', $this->config->contexts);
if (!empty($this->config->create_context)) {
array_push($contexts, $this->config->create_context);
}
$ldappagedresults = ldap_paged_results_supported($this->config->ldap_version, $ldapconnection);
$ldapcookie = '';
foreach ($contexts as $context) {
$context = trim($context);
if (empty($context)) {
continue;
}
do {
if ($ldappagedresults) {
ldap_control_paged_result($ldapconnection, $this->config->pagesize, true, $ldapcookie);
}
if ($this->config->search_sub) {
// Use ldap_search to find first user from subtree.
$ldapresult = ldap_search($ldapconnection, $context, $filter, array($this->config->user_attribute));
} else {
// Search only in this context.
$ldapresult = ldap_list($ldapconnection, $context, $filter, array($this->config->user_attribute));
}
if (!$ldapresult) {
continue;
}
if ($ldappagedresults) {
$pagedresp = ldap_control_paged_result_response($ldapconnection, $ldapresult, $ldapcookie);
// Function ldap_control_paged_result_response() does not overwrite $ldapcookie if it fails, by
// setting this to null we avoid an infinite loop.
if ($pagedresp === false) {
$ldapcookie = null;
}
}
if ($entry = @ldap_first_entry($ldapconnection, $ldapresult)) {
do {
$value = ldap_get_values_len($ldapconnection, $entry, $this->config->user_attribute);
$value = core_text::convert($value[0], $this->config->ldapencoding, 'utf-8');
$value = trim($value);
$this->ldap_bulk_insert($value);
} while ($entry = ldap_next_entry($ldapconnection, $entry));
}
unset($ldapresult); // Free mem.
} while ($ldappagedresults && $ldapcookie !== null && $ldapcookie != '');
}
// If LDAP paged results were used, the current connection must be completely
// closed and a new one created, to work without paged results from here on.
if ($ldappagedresults) {
$this->ldap_close(true);
$ldapconnection = $this->ldap_connect();
}
/// preserve our user database
/// if the temp table is empty, it probably means that something went wrong, exit
/// so as to avoid mass deletion of users; which is hard to undo
$count = $DB->count_records_sql('SELECT COUNT(username) AS count, 1 FROM {tmp_extuser}');
if ($count < 1) {
print_string('didntgetusersfromldap', 'auth_ldap');
$dbman->drop_table($table);
$this->ldap_close();
return false;
} else {
print_string('gotcountrecordsfromldap', 'auth_ldap', $count);
}
/// User removal
// Find users in DB that aren't in ldap -- to be removed!
// this is still not as scalable (but how often do we mass delete?)
if ($this->config->removeuser == AUTH_REMOVEUSER_FULLDELETE) {
$sql = "SELECT u.*
FROM {user} u
LEFT JOIN {tmp_extuser} e ON (u.username = e.username AND u.mnethostid = e.mnethostid)
WHERE u.auth = :auth
AND u.deleted = 0
AND e.username IS NULL";
$remove_users = $DB->get_records_sql($sql, array('auth'=>$this->authtype));
if (!empty($remove_users)) {
print_string('userentriestoremove', 'auth_ldap', count($remove_users));
foreach ($remove_users as $user) {
if (delete_user($user)) {
echo "\t"; print_string('auth_dbdeleteuser', 'auth_db', array('name'=>$user->username, 'id'=>$user->id)); echo "\n";
} else {
echo "\t"; print_string('auth_dbdeleteusererror', 'auth_db', $user->username); echo "\n";
}
}
} else {
print_string('nouserentriestoremove', 'auth_ldap');
}
unset($remove_users); // Free mem!
} else if ($this->config->removeuser == AUTH_REMOVEUSER_SUSPEND) {
$sql = "SELECT u.*
FROM {user} u
LEFT JOIN {tmp_extuser} e ON (u.username = e.username AND u.mnethostid = e.mnethostid)
WHERE u.auth = :auth
AND u.deleted = 0
AND u.suspended = 0
AND e.username IS NULL";
$remove_users = $DB->get_records_sql($sql, array('auth'=>$this->authtype));
if (!empty($remove_users)) {
print_string('userentriestoremove', 'auth_ldap', count($remove_users));
foreach ($remove_users as $user) {
$updateuser = new stdClass();
$updateuser->id = $user->id;
$updateuser->suspended = 1;
user_update_user($updateuser, false);
echo "\t"; print_string('auth_dbsuspenduser', 'auth_db', array('name'=>$user->username, 'id'=>$user->id)); echo "\n";
\core\session\manager::kill_user_sessions($user->id);
}
} else {
print_string('nouserentriestoremove', 'auth_ldap');
}
unset($remove_users); // Free mem!
}
/// Revive suspended users
if (!empty($this->config->removeuser) and $this->config->removeuser == AUTH_REMOVEUSER_SUSPEND) {
$sql = "SELECT u.id, u.username
FROM {user} u
JOIN {tmp_extuser} e ON (u.username = e.username AND u.mnethostid = e.mnethostid)
WHERE (u.auth = 'nologin' OR (u.auth = ? AND u.suspended = 1)) AND u.deleted = 0";
// Note: 'nologin' is there for backwards compatibility.
$revive_users = $DB->get_records_sql($sql, array($this->authtype));
if (!empty($revive_users)) {
print_string('userentriestorevive', 'auth_ldap', count($revive_users));
foreach ($revive_users as $user) {
$updateuser = new stdClass();
$updateuser->id = $user->id;
$updateuser->auth = $this->authtype;
$updateuser->suspended = 0;
user_update_user($updateuser, false);
echo "\t"; print_string('auth_dbreviveduser', 'auth_db', array('name'=>$user->username, 'id'=>$user->id)); echo "\n";
}
} else {
print_string('nouserentriestorevive', 'auth_ldap');
}
unset($revive_users);
}
/// User Updates - time-consuming (optional)
if ($do_updates) {
// Narrow down what fields we need to update
$updatekeys = $this->get_profile_keys();
} else {
print_string('noupdatestobedone', 'auth_ldap');
}
if ($do_updates and !empty($updatekeys)) { // run updates only if relevant
$users = $DB->get_records_sql('SELECT u.username, u.id
FROM {user} u
WHERE u.deleted = 0 AND u.auth = ? AND u.mnethostid = ?',
array($this->authtype, $CFG->mnet_localhost_id));
if (!empty($users)) {
print_string('userentriestoupdate', 'auth_ldap', count($users));
$transaction = $DB->start_delegated_transaction();
$xcount = 0;
$maxxcount = 100;
foreach ($users as $user) {
echo "\t"; print_string('auth_dbupdatinguser', 'auth_db', array('name'=>$user->username, 'id'=>$user->id));
$userinfo = $this->get_userinfo($user->username);
if (!$this->update_user_record($user->username, $updatekeys, true,
$this->is_user_suspended((object) $userinfo))) {
echo ' - '.get_string('skipped');
}
echo "\n";
$xcount++;
// Update system roles, if needed.
$this->sync_roles($user);
}
$transaction->allow_commit();
unset($users); // free mem
}
} else { // end do updates
print_string('noupdatestobedone', 'auth_ldap');
}
/// User Additions
// Find users missing in DB that are in LDAP
// and gives me a nifty object I don't want.
// note: we do not care about deleted accounts anymore, this feature was replaced by suspending to nologin auth plugin
$sql = 'SELECT e.id, e.username
FROM {tmp_extuser} e
LEFT JOIN {user} u ON (e.username = u.username AND e.mnethostid = u.mnethostid)
WHERE u.id IS NULL';
$add_users = $DB->get_records_sql($sql);
if (!empty($add_users)) {
print_string('userentriestoadd', 'auth_ldap', count($add_users));
$transaction = $DB->start_delegated_transaction();
foreach ($add_users as $user) {
$user = $this->get_userinfo_asobj($user->username);
// Prep a few params
$user->modified = time();
$user->confirmed = 1;
$user->auth = $this->authtype;
$user->mnethostid = $CFG->mnet_localhost_id;
// get_userinfo_asobj() might have replaced $user->username with the value
// from the LDAP server (which can be mixed-case). Make sure it's lowercase
$user->username = trim(core_text::strtolower($user->username));
// It isn't possible to just rely on the configured suspension attribute since
// things like active directory use bit masks, other things using LDAP might
// do different stuff as well.
//
// The cast to int is a workaround for MDL-53959.
$user->suspended = (int)$this->is_user_suspended($user);
if (empty($user->lang)) {
$user->lang = $CFG->lang;
}
if (empty($user->calendartype)) {
$user->calendartype = $CFG->calendartype;
}
$id = user_create_user($user, false);
echo "\t"; print_string('auth_dbinsertuser', 'auth_db', array('name'=>$user->username, 'id'=>$id)); echo "\n";
$euser = $DB->get_record('user', array('id' => $id));
if (!empty($this->config->forcechangepassword)) {
set_user_preference('auth_forcepasswordchange', 1, $id);
}
// Save custom profile fields.
$this->update_user_record($user->username, $this->get_profile_keys(true), false);
// Add roles if needed.
$this->sync_roles($euser);
}
$transaction->allow_commit();
unset($add_users); // free mem
} else {
print_string('nouserstobeadded', 'auth_ldap');
}
$dbman->drop_table($table);
$this->ldap_close();
return true;
}
/**
* Bulk insert in SQL's temp table
*/
function ldap_bulk_insert($username) {
global $DB, $CFG;
$username = core_text::strtolower($username); // usernames are __always__ lowercase.
$DB->insert_record_raw('tmp_extuser', array('username'=>$username,
'mnethostid'=>$CFG->mnet_localhost_id), false, true);
echo '.';
}
/**
* Activates (enables) user in external LDAP so user can login
*
* @param mixed $username
* @return boolean result
*/
function user_activate($username) {
$extusername = core_text::convert($username, 'utf-8', $this->config->ldapencoding);
$ldapconnection = $this->ldap_connect();
$userdn = $this->ldap_find_userdn($ldapconnection, $extusername);
switch ($this->config->user_type) {
case 'edir':
$newinfo['loginDisabled'] = 'FALSE';
break;
case 'rfc2307':
case 'rfc2307bis':
// Remember that we add a '*' character in front of the
// external password string to 'disable' the account. We just
// need to remove it.
$sr = ldap_read($ldapconnection, $userdn, '(objectClass=*)',
array('userPassword'));
$info = ldap_get_entries($ldapconnection, $sr);
$info[0] = array_change_key_case($info[0], CASE_LOWER);
$newinfo['userPassword'] = ltrim($info[0]['userpassword'][0], '*');
break;
case 'ad':
// We need to unset the ACCOUNTDISABLE bit in the
// userAccountControl attribute ( see
// http://support.microsoft.com/kb/305144 )
$sr = ldap_read($ldapconnection, $userdn, '(objectClass=*)',
array('userAccountControl'));
$info = ldap_get_entries($ldapconnection, $sr);
$info[0] = array_change_key_case($info[0], CASE_LOWER);
$newinfo['userAccountControl'] = $info[0]['useraccountcontrol'][0]
& (~AUTH_AD_ACCOUNTDISABLE);
break;
default:
print_error('user_activatenotsupportusertype', 'auth_ldap', '', $this->config->user_type_name);
}
$result = ldap_modify($ldapconnection, $userdn, $newinfo);
$this->ldap_close();
return $result;
}
/**
* Returns true if user should be coursecreator.
*
* @param mixed $username username (without system magic quotes)
* @return mixed result null if course creators is not configured, boolean otherwise.
*
* @deprecated since Moodle 3.4 MDL-30634 - please do not use this function any more.
*/
function iscreator($username) {
debugging('iscreator() is deprecated. Please use auth_plugin_ldap::is_role() instead.', DEBUG_DEVELOPER);
if (empty($this->config->creators) or empty($this->config->memberattribute)) {
return null;
}
$extusername = core_text::convert($username, 'utf-8', $this->config->ldapencoding);
$ldapconnection = $this->ldap_connect();
if ($this->config->memberattribute_isdn) {
if(!($userid = $this->ldap_find_userdn($ldapconnection, $extusername))) {
return false;
}
} else {
$userid = $extusername;
}
$group_dns = explode(';', $this->config->creators);
$creator = ldap_isgroupmember($ldapconnection, $userid, $group_dns, $this->config->memberattribute);
$this->ldap_close();
return $creator;
}
/**
* Check if user has LDAP group membership.
*
* Returns true if user should be assigned role.
*
* @param mixed $username username (without system magic quotes).
* @param array $role Array of role's shortname, localname, and settingname for the config value.
* @return mixed result null if role/LDAP context is not configured, boolean otherwise.
*/
private function is_role($username, $role) {
if (empty($this->config->{$role['settingname']}) or empty($this->config->memberattribute)) {
return null;
}
$extusername = core_text::convert($username, 'utf-8', $this->config->ldapencoding);
$ldapconnection = $this->ldap_connect();
if ($this->config->memberattribute_isdn) {
if (!($userid = $this->ldap_find_userdn($ldapconnection, $extusername))) {
return false;
}
} else {
$userid = $extusername;
}
$groupdns = explode(';', $this->config->{$role['settingname']});
$isrole = ldap_isgroupmember($ldapconnection, $userid, $groupdns, $this->config->memberattribute);
$this->ldap_close();
return $isrole;
}
/**
* Called when the user record is updated.
*
* Modifies user in external LDAP server. It takes olduser (before
* changes) and newuser (after changes) compares information and
* saves modified information to external LDAP server.
*
* @param mixed $olduser Userobject before modifications (without system magic quotes)
* @param mixed $newuser Userobject new modified userobject (without system magic quotes)
* @return boolean result
*
*/
function user_update($olduser, $newuser) {
global $CFG;
require_once($CFG->dirroot . '/user/profile/lib.php');
if (isset($olduser->username) and isset($newuser->username) and $olduser->username != $newuser->username) {
error_log($this->errorlogtag.get_string('renamingnotallowed', 'auth_ldap'));
return false;
}
if (isset($olduser->auth) and $olduser->auth != $this->authtype) {
return true; // just change auth and skip update
}
$attrmap = $this->ldap_attributes();
// Before doing anything else, make sure we really need to update anything
// in the external LDAP server.
$update_external = false;
foreach ($attrmap as $key => $ldapkeys) {
if (!empty($this->config->{'field_updateremote_'.$key})) {
$update_external = true;
break;
}
}
if (!$update_external) {
return true;
}
$extoldusername = core_text::convert($olduser->username, 'utf-8', $this->config->ldapencoding);
$ldapconnection = $this->ldap_connect();
$search_attribs = array();
foreach ($attrmap as $key => $values) {
if (!is_array($values)) {
$values = array($values);
}
foreach ($values as $value) {
if (!in_array($value, $search_attribs)) {
array_push($search_attribs, $value);
}
}
}
if(!($user_dn = $this->ldap_find_userdn($ldapconnection, $extoldusername))) {
return false;
}
// Load old custom fields.
$olduserprofilefields = (array) profile_user_record($olduser->id, false);
$fields = array();
foreach (profile_get_custom_fields(false) as $field) {
$fields[$field->shortname] = $field;
}
$success = true;
$user_info_result = ldap_read($ldapconnection, $user_dn, '(objectClass=*)', $search_attribs);
if ($user_info_result) {
$user_entry = ldap_get_entries_moodle($ldapconnection, $user_info_result);
if (empty($user_entry)) {
$attribs = join (', ', $search_attribs);
error_log($this->errorlogtag.get_string('updateusernotfound', 'auth_ldap',
array('userdn'=>$user_dn,
'attribs'=>$attribs)));
return false; // old user not found!
} else if (count($user_entry) > 1) {
error_log($this->errorlogtag.get_string('morethanoneuser', 'auth_ldap'));
return false;
}
$user_entry = $user_entry[0];
foreach ($attrmap as $key => $ldapkeys) {
if (preg_match('/^profile_field_(.*)$/', $key, $match)) {
// Custom field.
$fieldname = $match[1];
if (isset($fields[$fieldname])) {
$class = 'profile_field_' . $fields[$fieldname]->datatype;
$formfield = new $class($fields[$fieldname]->id, $olduser->id);
$oldvalue = isset($olduserprofilefields[$fieldname]) ? $olduserprofilefields[$fieldname] : null;
} else {
$oldvalue = null;
}
$newvalue = $formfield->edit_save_data_preprocess($newuser->{$formfield->inputname}, new stdClass);
} else {
// Standard field.
$oldvalue = isset($olduser->$key) ? $olduser->$key : null;
$newvalue = isset($newuser->$key) ? $newuser->$key : null;
}
if ($newvalue !== null and $newvalue !== $oldvalue and !empty($this->config->{'field_updateremote_' . $key})) {
// For ldap values that could be in more than one
// ldap key, we will do our best to match
// where they came from
$ambiguous = true;
$changed = false;
if (!is_array($ldapkeys)) {
$ldapkeys = array($ldapkeys);
}
if (count($ldapkeys) < 2) {
$ambiguous = false;
}
$nuvalue = core_text::convert($newvalue, 'utf-8', $this->config->ldapencoding);
empty($nuvalue) ? $nuvalue = array() : $nuvalue;
$ouvalue = core_text::convert($oldvalue, 'utf-8', $this->config->ldapencoding);
foreach ($ldapkeys as $ldapkey) {
// Skip update if $ldapkey does not exist in LDAP.
if (!isset($user_entry[$ldapkey][0])) {
$success = false;
error_log($this->errorlogtag.get_string('updateremfailfield', 'auth_ldap',
array('ldapkey' => $ldapkey,
'key' => $key,
'ouvalue' => $ouvalue,
'nuvalue' => $nuvalue)));
continue;
}
$ldapvalue = $user_entry[$ldapkey][0];
if (!$ambiguous) {
// Skip update if the values already match
if ($nuvalue !== $ldapvalue) {
// This might fail due to schema validation
if (@ldap_modify($ldapconnection, $user_dn, array($ldapkey => $nuvalue))) {
$changed = true;
continue;
} else {
$success = false;
error_log($this->errorlogtag.get_string ('updateremfail', 'auth_ldap',
array('errno'=>ldap_errno($ldapconnection),
'errstring'=>ldap_err2str(ldap_errno($ldapconnection)),
'key'=>$key,
'ouvalue'=>$ouvalue,
'nuvalue'=>$nuvalue)));
continue;
}
}
} else {
// Ambiguous. Value empty before in Moodle (and LDAP) - use
// 1st ldap candidate field, no need to guess
if ($ouvalue === '') { // value empty before - use 1st ldap candidate
// This might fail due to schema validation
if (@ldap_modify($ldapconnection, $user_dn, array($ldapkey => $nuvalue))) {
$changed = true;
continue;
} else {
$success = false;
error_log($this->errorlogtag.get_string ('updateremfail', 'auth_ldap',
array('errno'=>ldap_errno($ldapconnection),
'errstring'=>ldap_err2str(ldap_errno($ldapconnection)),
'key'=>$key,
'ouvalue'=>$ouvalue,
'nuvalue'=>$nuvalue)));
continue;
}
}
// We found which ldap key to update!
if ($ouvalue !== '' and $ouvalue === $ldapvalue ) {
// This might fail due to schema validation
if (@ldap_modify($ldapconnection, $user_dn, array($ldapkey => $nuvalue))) {
$changed = true;
continue;
} else {
$success = false;
error_log($this->errorlogtag.get_string ('updateremfail', 'auth_ldap',
array('errno'=>ldap_errno($ldapconnection),
'errstring'=>ldap_err2str(ldap_errno($ldapconnection)),
'key'=>$key,
'ouvalue'=>$ouvalue,
'nuvalue'=>$nuvalue)));
continue;
}
}
}
}
if ($ambiguous and !$changed) {
$success = false;
error_log($this->errorlogtag.get_string ('updateremfailamb', 'auth_ldap',
array('key'=>$key,
'ouvalue'=>$ouvalue,
'nuvalue'=>$nuvalue)));
}
}
}
} else {
error_log($this->errorlogtag.get_string ('usernotfound', 'auth_ldap'));
$success = false;
}
$this->ldap_close();
return $success;
}
/**
* Changes userpassword in LDAP
*
* Called when the user password is updated. It assumes it is
* called by an admin or that you've otherwise checked the user's
* credentials
*
* @param object $user User table object
* @param string $newpassword Plaintext password (not crypted/md5'ed)
* @return boolean result
*
*/
function user_update_password($user, $newpassword) {
global $USER;
$result = false;
$username = $user->username;
$extusername = core_text::convert($username, 'utf-8', $this->config->ldapencoding);
$extpassword = core_text::convert($newpassword, 'utf-8', $this->config->ldapencoding);
switch ($this->config->passtype) {
case 'md5':
$extpassword = '{MD5}' . base64_encode(pack('H*', md5($extpassword)));
break;
case 'sha1':
$extpassword = '{SHA}' . base64_encode(pack('H*', sha1($extpassword)));
break;
case 'plaintext':
default:
break; // plaintext
}
$ldapconnection = $this->ldap_connect();
$user_dn = $this->ldap_find_userdn($ldapconnection, $extusername);
if (!$user_dn) {
error_log($this->errorlogtag.get_string ('nodnforusername', 'auth_ldap', $user->username));
return false;
}
switch ($this->config->user_type) {
case 'edir':
// Change password
$result = ldap_modify($ldapconnection, $user_dn, array('userPassword' => $extpassword));
if (!$result) {
error_log($this->errorlogtag.get_string ('updatepasserror', 'auth_ldap',
array('errno'=>ldap_errno($ldapconnection),
'errstring'=>ldap_err2str(ldap_errno($ldapconnection)))));
}
// Update password expiration time, grace logins count
$search_attribs = array($this->config->expireattr, 'passwordExpirationInterval', 'loginGraceLimit');
$sr = ldap_read($ldapconnection, $user_dn, '(objectClass=*)', $search_attribs);
if ($sr) {
$entry = ldap_get_entries_moodle($ldapconnection, $sr);
$info = $entry[0];
$newattrs = array();
if (!empty($info[$this->config->expireattr][0])) {
// Set expiration time only if passwordExpirationInterval is defined
if (!empty($info['passwordexpirationinterval'][0])) {
$expirationtime = time() + $info['passwordexpirationinterval'][0];
$ldapexpirationtime = $this->ldap_unix2expirationtime($expirationtime);
$newattrs['passwordExpirationTime'] = $ldapexpirationtime;
}
// Set gracelogin count
if (!empty($info['logingracelimit'][0])) {
$newattrs['loginGraceRemaining']= $info['logingracelimit'][0];
}
// Store attribute changes in LDAP
$result = ldap_modify($ldapconnection, $user_dn, $newattrs);
if (!$result) {
error_log($this->errorlogtag.get_string ('updatepasserrorexpiregrace', 'auth_ldap',
array('errno'=>ldap_errno($ldapconnection),
'errstring'=>ldap_err2str(ldap_errno($ldapconnection)))));
}
}
}
else {
error_log($this->errorlogtag.get_string ('updatepasserrorexpire', 'auth_ldap',
array('errno'=>ldap_errno($ldapconnection),
'errstring'=>ldap_err2str(ldap_errno($ldapconnection)))));
}
break;
case 'ad':
// Passwords in Active Directory must be encoded as Unicode
// strings (UCS-2 Little Endian format) and surrounded with
// double quotes. See http://support.microsoft.com/?kbid=269190
if (!function_exists('mb_convert_encoding')) {
error_log($this->errorlogtag.get_string ('needmbstring', 'auth_ldap'));
return false;
}
$extpassword = mb_convert_encoding('"'.$extpassword.'"', "UCS-2LE", $this->config->ldapencoding);
$result = ldap_modify($ldapconnection, $user_dn, array('unicodePwd' => $extpassword));
if (!$result) {
error_log($this->errorlogtag.get_string ('updatepasserror', 'auth_ldap',
array('errno'=>ldap_errno($ldapconnection),
'errstring'=>ldap_err2str(ldap_errno($ldapconnection)))));
}
break;
default:
// Send LDAP the password in cleartext, it will md5 it itself
$result = ldap_modify($ldapconnection, $user_dn, array('userPassword' => $extpassword));
if (!$result) {
error_log($this->errorlogtag.get_string ('updatepasserror', 'auth_ldap',
array('errno'=>ldap_errno($ldapconnection),
'errstring'=>ldap_err2str(ldap_errno($ldapconnection)))));
}
}
$this->ldap_close();
return $result;
}
/**
* Take expirationtime and return it as unix timestamp in seconds
*
* Takes expiration timestamp as read from LDAP and returns it as unix timestamp in seconds
* Depends on $this->config->user_type variable
*
* @param mixed time Time stamp read from LDAP as it is.
* @param string $ldapconnection Only needed for Active Directory.
* @param string $user_dn User distinguished name for the user we are checking password expiration (only needed for Active Directory).
* @return timestamp
*/
function ldap_expirationtime2unix ($time, $ldapconnection, $user_dn) {
$result = false;
switch ($this->config->user_type) {
case 'edir':
$yr=substr($time, 0, 4);
$mo=substr($time, 4, 2);
$dt=substr($time, 6, 2);
$hr=substr($time, 8, 2);
$min=substr($time, 10, 2);
$sec=substr($time, 12, 2);
$result = mktime($hr, $min, $sec, $mo, $dt, $yr);
break;
case 'rfc2307':
case 'rfc2307bis':
$result = $time * DAYSECS; // The shadowExpire contains the number of DAYS between 01/01/1970 and the actual expiration date
break;
case 'ad':
$result = $this->ldap_get_ad_pwdexpire($time, $ldapconnection, $user_dn);
break;
default:
print_error('auth_ldap_usertypeundefined', 'auth_ldap');
}
return $result;
}
/**
* Takes unix timestamp and returns it formated for storing in LDAP
*
* @param integer unix time stamp
*/
function ldap_unix2expirationtime($time) {
$result = false;
switch ($this->config->user_type) {
case 'edir':
$result=date('YmdHis', $time).'Z';
break;
case 'rfc2307':
case 'rfc2307bis':
$result = $time ; // Already in correct format
break;
default:
print_error('auth_ldap_usertypeundefined2', 'auth_ldap');
}
return $result;
}
/**
* Returns user attribute mappings between moodle and LDAP
*
* @return array
*/
function ldap_attributes () {
$moodleattributes = array();
// If we have custom fields then merge them with user fields.
$customfields = $this->get_custom_user_profile_fields();
if (!empty($customfields) && !empty($this->userfields)) {
$userfields = array_merge($this->userfields, $customfields);
} else {
$userfields = $this->userfields;
}
foreach ($userfields as $field) {
if (!empty($this->config->{"field_map_$field"})) {
$moodleattributes[$field] = core_text::strtolower(trim($this->config->{"field_map_$field"}));
if (preg_match('/,/', $moodleattributes[$field])) {
$moodleattributes[$field] = explode(',', $moodleattributes[$field]); // split ?
}
}
}
$moodleattributes['username'] = core_text::strtolower(trim($this->config->user_attribute));
$moodleattributes['suspended'] = core_text::strtolower(trim($this->config->suspended_attribute));
return $moodleattributes;
}
/**
* Returns all usernames from LDAP
*
* @param $filter An LDAP search filter to select desired users
* @return array of LDAP user names converted to UTF-8
*/
function ldap_get_userlist($filter='*') {
$fresult = array();
$ldapconnection = $this->ldap_connect();
if ($filter == '*') {
$filter = '(&('.$this->config->user_attribute.'=*)'.$this->config->objectclass.')';
}
$contexts = explode(';', $this->config->contexts);
if (!empty($this->config->create_context)) {
array_push($contexts, $this->config->create_context);
}
$ldap_cookie = '';
$ldap_pagedresults = ldap_paged_results_supported($this->config->ldap_version, $ldapconnection);
foreach ($contexts as $context) {
$context = trim($context);
if (empty($context)) {
continue;
}
do {
if ($ldap_pagedresults) {
ldap_control_paged_result($ldapconnection, $this->config->pagesize, true, $ldap_cookie);
}
if ($this->config->search_sub) {
// Use ldap_search to find first user from subtree.
$ldap_result = ldap_search($ldapconnection, $context, $filter, array($this->config->user_attribute));
} else {
// Search only in this context.
$ldap_result = ldap_list($ldapconnection, $context, $filter, array($this->config->user_attribute));
}
if(!$ldap_result) {
continue;
}
if ($ldap_pagedresults) {
ldap_control_paged_result_response($ldapconnection, $ldap_result, $ldap_cookie);
}
$users = ldap_get_entries_moodle($ldapconnection, $ldap_result);
// Add found users to list.
for ($i = 0; $i < count($users); $i++) {
$extuser = core_text::convert($users[$i][$this->config->user_attribute][0],
$this->config->ldapencoding, 'utf-8');
array_push($fresult, $extuser);
}
unset($ldap_result); // Free mem.
} while ($ldap_pagedresults && !empty($ldap_cookie));
}
// If paged results were used, make sure the current connection is completely closed
$this->ldap_close($ldap_pagedresults);
return $fresult;
}
/**
* Indicates if password hashes should be stored in local moodle database.
*
* @return bool true means flag 'not_cached' stored instead of password hash
*/
function prevent_local_passwords() {
return !empty($this->config->preventpassindb);
}
/**
* Returns true if this authentication plugin is 'internal'.
*
* @return bool
*/
function is_internal() {
return false;
}
/**
* Returns true if this authentication plugin can change the user's
* password.
*
* @return bool
*/
function can_change_password() {
return !empty($this->config->stdchangepassword) or !empty($this->config->changepasswordurl);
}
/**
* Returns the URL for changing the user's password, or empty if the default can
* be used.
*
* @return moodle_url
*/
function change_password_url() {
if (empty($this->config->stdchangepassword)) {
if (!empty($this->config->changepasswordurl)) {
return new moodle_url($this->config->changepasswordurl);
} else {
return null;
}
} else {
return null;
}
}
/**
* Will get called before the login page is shownr. Ff NTLM SSO
* is enabled, and the user is in the right network, we'll redirect
* to the magic NTLM page for SSO...
*
*/
function loginpage_hook() {
global $CFG, $SESSION;
// HTTPS is potentially required
//httpsrequired(); - this must be used before setting the URL, it is already done on the login/index.php
if (($_SERVER['REQUEST_METHOD'] === 'GET' // Only on initial GET of loginpage
|| ($_SERVER['REQUEST_METHOD'] === 'POST'
&& (get_local_referer() != strip_querystring(qualified_me()))))
// Or when POSTed from another place
// See MDL-14071
&& !empty($this->config->ntlmsso_enabled) // SSO enabled
&& !empty($this->config->ntlmsso_subnet) // have a subnet to test for
&& empty($_GET['authldap_skipntlmsso']) // haven't failed it yet
&& (isguestuser() || !isloggedin()) // guestuser or not-logged-in users
&& address_in_subnet(getremoteaddr(), $this->config->ntlmsso_subnet)) {
// First, let's remember where we were trying to get to before we got here
if (empty($SESSION->wantsurl)) {
$SESSION->wantsurl = null;
$referer = get_local_referer(false);
if ($referer &&
$referer != $CFG->wwwroot &&
$referer != $CFG->wwwroot . '/' &&
$referer != $CFG->wwwroot . '/login/' &&
$referer != $CFG->wwwroot . '/login/index.php') {
$SESSION->wantsurl = $referer;
}
}
// Now start the whole NTLM machinery.
if($this->config->ntlmsso_ie_fastpath == AUTH_NTLM_FASTPATH_YESATTEMPT ||
$this->config->ntlmsso_ie_fastpath == AUTH_NTLM_FASTPATH_YESFORM) {
if (core_useragent::is_ie()) {
$sesskey = sesskey();
redirect($CFG->wwwroot.'/auth/ldap/ntlmsso_magic.php?sesskey='.$sesskey);
} else if ($this->config->ntlmsso_ie_fastpath == AUTH_NTLM_FASTPATH_YESFORM) {
redirect($CFG->wwwroot.'/login/index.php?authldap_skipntlmsso=1');
}
}
redirect($CFG->wwwroot.'/auth/ldap/ntlmsso_attempt.php');
}
// No NTLM SSO, Use the normal login page instead.
// If $SESSION->wantsurl is empty and we have a 'Referer:' header, the login
// page insists on redirecting us to that page after user validation. If
// we clicked on the redirect link at the ntlmsso_finish.php page (instead
// of waiting for the redirection to happen) then we have a 'Referer:' header
// we don't want to use at all. As we can't get rid of it, just point
// $SESSION->wantsurl to $CFG->wwwroot (after all, we came from there).
if (empty($SESSION->wantsurl)
&& (get_local_referer() == $CFG->wwwroot.'/auth/ldap/ntlmsso_finish.php')) {
$SESSION->wantsurl = $CFG->wwwroot;
}
}
/**
* To be called from a page running under NTLM's
* "Integrated Windows Authentication".
*
* If successful, it will set a special "cookie" (not an HTTP cookie!)
* in cache_flags under the $this->pluginconfig/ntlmsess "plugin" and return true.
* The "cookie" will be picked up by ntlmsso_finish() to complete the
* process.
*
* On failure it will return false for the caller to display an appropriate
* error message (probably saying that Integrated Windows Auth isn't enabled!)
*
* NOTE that this code will execute under the OS user credentials,
* so we MUST avoid dealing with files -- such as session files.
* (The caller should define('NO_MOODLE_COOKIES', true) before including config.php)
*
*/
function ntlmsso_magic($sesskey) {
if (isset($_SERVER['REMOTE_USER']) && !empty($_SERVER['REMOTE_USER'])) {
// HTTP __headers__ seem to be sent in ISO-8859-1 encoding
// (according to my reading of RFC-1945, RFC-2616 and RFC-2617 and
// my local tests), so we need to convert the REMOTE_USER value
// (i.e., what we got from the HTTP WWW-Authenticate header) into UTF-8
$username = core_text::convert($_SERVER['REMOTE_USER'], 'iso-8859-1', 'utf-8');
switch ($this->config->ntlmsso_type) {
case 'ntlm':
// The format is now configurable, so try to extract the username
$username = $this->get_ntlm_remote_user($username);
if (empty($username)) {
return false;
}
break;
case 'kerberos':
// Format is username@DOMAIN
$username = substr($username, 0, strpos($username, '@'));
break;
default:
error_log($this->errorlogtag.get_string ('ntlmsso_unknowntype', 'auth_ldap'));
return false; // Should never happen!
}
$username = core_text::strtolower($username); // Compatibility hack
set_cache_flag($this->pluginconfig.'/ntlmsess', $sesskey, $username, AUTH_NTLMTIMEOUT);
return true;
}
return false;
}
/**
* Find the session set by ntlmsso_magic(), validate it and
* call authenticate_user_login() to authenticate the user through
* the auth machinery.
*
* It is complemented by a similar check in user_login().
*
* If it succeeds, it never returns.
*
*/
function ntlmsso_finish() {
global $CFG, $USER, $SESSION;
$key = sesskey();
$username = get_cache_flag($this->pluginconfig.'/ntlmsess', $key);
if (empty($username)) {
return false;
}
// Here we want to trigger the whole authentication machinery
// to make sure no step is bypassed...
$reason = null;
$user = authenticate_user_login($username, $key, false, $reason, false);
if ($user) {
complete_user_login($user);
// Cleanup the key to prevent reuse...
// and to allow re-logins with normal credentials
unset_cache_flag($this->pluginconfig.'/ntlmsess', $key);
// Redirection
if (user_not_fully_set_up($USER, true)) {
$urltogo = $CFG->wwwroot.'/user/edit.php';
// We don't delete $SESSION->wantsurl yet, so we get there later
} else if (isset($SESSION->wantsurl) and (strpos($SESSION->wantsurl, $CFG->wwwroot) === 0)) {
$urltogo = $SESSION->wantsurl; // Because it's an address in this site
unset($SESSION->wantsurl);
} else {
// No wantsurl stored or external - go to homepage
$urltogo = $CFG->wwwroot.'/';
unset($SESSION->wantsurl);
}
// We do not want to redirect if we are in a PHPUnit test.
if (!PHPUNIT_TEST) {
redirect($urltogo);
}
}
// Should never reach here.
return false;
}
/**
* Sync roles for this user.
*
* @param object $user The user to sync (without system magic quotes).
*/
function sync_roles($user) {
global $DB;
$roles = get_ldap_assignable_role_names(2); // Admin user.
foreach ($roles as $role) {
$isrole = $this->is_role($user->username, $role);
if ($isrole === null) {
continue; // Nothing to sync - role/LDAP contexts not configured.
}
// Sync user.
$systemcontext = context_system::instance();
if ($isrole) {
// Following calls will not create duplicates.
role_assign($role['id'], $user->id, $systemcontext->id, $this->roleauth);
} else {
// Unassign only if previously assigned by this plugin.
role_unassign($role['id'], $user->id, $systemcontext->id, $this->roleauth);
}
}
}
/**
* Get password expiration time for a given user from Active Directory
*
* @param string $pwdlastset The time last time we changed the password.
* @param resource $lcapconn The open LDAP connection.
* @param string $user_dn The distinguished name of the user we are checking.
*
* @return string $unixtime
*/
function ldap_get_ad_pwdexpire($pwdlastset, $ldapconn, $user_dn){
global $CFG;
if (!function_exists('bcsub')) {
error_log($this->errorlogtag.get_string ('needbcmath', 'auth_ldap'));
return 0;
}
// If UF_DONT_EXPIRE_PASSWD flag is set in user's
// userAccountControl attribute, the password doesn't expire.
$sr = ldap_read($ldapconn, $user_dn, '(objectClass=*)',
array('userAccountControl'));
if (!$sr) {
error_log($this->errorlogtag.get_string ('useracctctrlerror', 'auth_ldap', $user_dn));
// Don't expire password, as we are not sure if it has to be
// expired or not.
return 0;
}
$entry = ldap_get_entries_moodle($ldapconn, $sr);
$info = $entry[0];
$useraccountcontrol = $info['useraccountcontrol'][0];
if ($useraccountcontrol & UF_DONT_EXPIRE_PASSWD) {
// Password doesn't expire.
return 0;
}
// If pwdLastSet is zero, the user must change his/her password now
// (unless UF_DONT_EXPIRE_PASSWD flag is set, but we already
// tested this above)
if ($pwdlastset === '0') {
// Password has expired
return -1;
}
// ----------------------------------------------------------------
// Password expiration time in Active Directory is the composition of
// two values:
//
// - User's pwdLastSet attribute, that stores the last time
// the password was changed.
//
// - Domain's maxPwdAge attribute, that sets how long
// passwords last in this domain.
//
// We already have the first value (passed in as a parameter). We
// need to get the second one. As we don't know the domain DN, we
// have to query rootDSE's defaultNamingContext attribute to get
// it. Then we have to query that DN's maxPwdAge attribute to get
// the real value.
//
// Once we have both values, we just need to combine them. But MS
// chose to use a different base and unit for time measurements.
// So we need to convert the values to Unix timestamps (see
// details below).
// ----------------------------------------------------------------
$sr = ldap_read($ldapconn, ROOTDSE, '(objectClass=*)',
array('defaultNamingContext'));
if (!$sr) {
error_log($this->errorlogtag.get_string ('rootdseerror', 'auth_ldap'));
return 0;
}
$entry = ldap_get_entries_moodle($ldapconn, $sr);
$info = $entry[0];
$domaindn = $info['defaultnamingcontext'][0];
$sr = ldap_read ($ldapconn, $domaindn, '(objectClass=*)',
array('maxPwdAge'));
$entry = ldap_get_entries_moodle($ldapconn, $sr);
$info = $entry[0];
$maxpwdage = $info['maxpwdage'][0];
if ($sr = ldap_read($ldapconn, $user_dn, '(objectClass=*)', array('msDS-ResultantPSO'))) {
if ($entry = ldap_get_entries_moodle($ldapconn, $sr)) {
$info = $entry[0];
$userpso = $info['msds-resultantpso'][0];
// If a PSO exists, FGPP is being utilized.
// Grab the new maxpwdage from the msDS-MaximumPasswordAge attribute of the PSO.
if (!empty($userpso)) {
$sr = ldap_read($ldapconn, $userpso, '(objectClass=*)', array('msDS-MaximumPasswordAge'));
if ($entry = ldap_get_entries_moodle($ldapconn, $sr)) {
$info = $entry[0];
// Default value of msds-maximumpasswordage is 42 and is always set.
$maxpwdage = $info['msds-maximumpasswordage'][0];
}
}
}
}
// ----------------------------------------------------------------
// MSDN says that "pwdLastSet contains the number of 100 nanosecond
// intervals since January 1, 1601 (UTC), stored in a 64 bit integer".
//
// According to Perl's Date::Manip, the number of seconds between
// this date and Unix epoch is 11644473600. So we have to
// substract this value to calculate a Unix time, once we have
// scaled pwdLastSet to seconds. This is the script used to
// calculate the value shown above:
//
// #!/usr/bin/perl -w
//
// use Date::Manip;
//
// $date1 = ParseDate ("160101010000 UTC");
// $date2 = ParseDate ("197001010000 UTC");
// $delta = DateCalc($date1, $date2, \$err);
// $secs = Delta_Format($delta, 0, "%st");
// print "$secs \n";
//
// MSDN also says that "maxPwdAge is stored as a large integer that
// represents the number of 100 nanosecond intervals from the time
// the password was set before the password expires." We also need
// to scale this to seconds. Bear in mind that this value is stored
// as a _negative_ quantity (at least in my AD domain).
//
// As a last remark, if the low 32 bits of maxPwdAge are equal to 0,
// the maximum password age in the domain is set to 0, which means
// passwords do not expire (see
// http://msdn2.microsoft.com/en-us/library/ms974598.aspx)
//
// As the quantities involved are too big for PHP integers, we
// need to use BCMath functions to work with arbitrary precision
// numbers.
// ----------------------------------------------------------------
// If the low order 32 bits are 0, then passwords do not expire in
// the domain. Just do '$maxpwdage mod 2^32' and check the result
// (2^32 = 4294967296)
if (bcmod ($maxpwdage, 4294967296) === '0') {
return 0;
}
// Add up pwdLastSet and maxPwdAge to get password expiration
// time, in MS time units. Remember maxPwdAge is stored as a
// _negative_ quantity, so we need to substract it in fact.
$pwdexpire = bcsub ($pwdlastset, $maxpwdage);
// Scale the result to convert it to Unix time units and return
// that value.
return bcsub( bcdiv($pwdexpire, '10000000'), '11644473600');
}
/**
* Connect to the LDAP server, using the plugin configured
* settings. It's actually a wrapper around ldap_connect_moodle()
*
* @return resource A valid LDAP connection (or dies if it can't connect)
*/
function ldap_connect() {
// Cache ldap connections. They are expensive to set up
// and can drain the TCP/IP ressources on the server if we
// are syncing a lot of users (as we try to open a new connection
// to get the user details). This is the least invasive way
// to reuse existing connections without greater code surgery.
if(!empty($this->ldapconnection)) {
$this->ldapconns++;
return $this->ldapconnection;
}
if($ldapconnection = ldap_connect_moodle($this->config->host_url, $this->config->ldap_version,
$this->config->user_type, $this->config->bind_dn,
$this->config->bind_pw, $this->config->opt_deref,
$debuginfo, $this->config->start_tls)) {
$this->ldapconns = 1;
$this->ldapconnection = $ldapconnection;
return $ldapconnection;
}
print_error('auth_ldap_noconnect_all', 'auth_ldap', '', $debuginfo);
}
/**
* Disconnects from a LDAP server
*
* @param force boolean Forces closing the real connection to the LDAP server, ignoring any
* cached connections. This is needed when we've used paged results
* and want to use normal results again.
*/
function ldap_close($force=false) {
$this->ldapconns--;
if (($this->ldapconns == 0) || ($force)) {
$this->ldapconns = 0;
@ldap_close($this->ldapconnection);
unset($this->ldapconnection);
}
}
/**
* Search specified contexts for username and return the user dn
* like: cn=username,ou=suborg,o=org. It's actually a wrapper
* around ldap_find_userdn().
*
* @param resource $ldapconnection a valid LDAP connection
* @param string $extusername the username to search (in external LDAP encoding, no db slashes)
* @return mixed the user dn (external LDAP encoding) or false
*/
function ldap_find_userdn($ldapconnection, $extusername) {
$ldap_contexts = explode(';', $this->config->contexts);
if (!empty($this->config->create_context)) {
array_push($ldap_contexts, $this->config->create_context);
}
return ldap_find_userdn($ldapconnection, $extusername, $ldap_contexts, $this->config->objectclass,
$this->config->user_attribute, $this->config->search_sub);
}
/**
* When using NTLM SSO, the format of the remote username we get in
* $_SERVER['REMOTE_USER'] may vary, depending on where from and how the web
* server gets the data. So we let the admin configure the format using two
* place holders (%domain% and %username%). This function tries to extract
* the username (stripping the domain part and any separators if they are
* present) from the value present in $_SERVER['REMOTE_USER'], using the
* configured format.
*
* @param string $remoteuser The value from $_SERVER['REMOTE_USER'] (converted to UTF-8)
*
* @return string The remote username (without domain part or
* separators). Empty string if we can't extract the username.
*/
protected function get_ntlm_remote_user($remoteuser) {
if (empty($this->config->ntlmsso_remoteuserformat)) {
$format = AUTH_NTLM_DEFAULT_FORMAT;
} else {
$format = $this->config->ntlmsso_remoteuserformat;
}
$format = preg_quote($format);
$formatregex = preg_replace(array('#%domain%#', '#%username%#'),
array('('.AUTH_NTLM_VALID_DOMAINNAME.')', '('.AUTH_NTLM_VALID_USERNAME.')'),
$format);
if (preg_match('#^'.$formatregex.'$#', $remoteuser, $matches)) {
$user = end($matches);
return $user;
}
/* We are unable to extract the username with the configured format. Probably
* the format specified is wrong, so log a warning for the admin and return
* an empty username.
*/
error_log($this->errorlogtag.get_string ('auth_ntlmsso_maybeinvalidformat', 'auth_ldap'));
return '';
}
/**
* Check if the diagnostic message for the LDAP login error tells us that the
* login is denied because the user password has expired or the password needs
* to be changed on first login (using interactive SMB/Windows logins, not
* LDAP logins).
*
* @param string the diagnostic message for the LDAP login error
* @return bool true if the password has expired or the password must be changed on first login
*/
protected function ldap_ad_pwdexpired_from_diagmsg($diagmsg) {
// The format of the diagnostic message is (actual examples from W2003 and W2008):
// "80090308: LdapErr: DSID-0C090334, comment: AcceptSecurityContext error, data 52e, vece" (W2003)
// "80090308: LdapErr: DSID-0C090334, comment: AcceptSecurityContext error, data 773, vece" (W2003)
// "80090308: LdapErr: DSID-0C0903AA, comment: AcceptSecurityContext error, data 52e, v1771" (W2008)
// "80090308: LdapErr: DSID-0C0903AA, comment: AcceptSecurityContext error, data 773, v1771" (W2008)
// We are interested in the 'data nnn' part.
// if nnn == 773 then user must change password on first login
// if nnn == 532 then user password has expired
$diagmsg = explode(',', $diagmsg);
if (preg_match('/data (773|532)/i', trim($diagmsg[2]))) {
return true;
}
return false;
}
/**
* Check if a user is suspended. This function is intended to be used after calling
* get_userinfo_asobj. This is needed because LDAP doesn't have a notion of disabled
* users, however things like MS Active Directory support it and expose information
* through a field.
*
* @param object $user the user object returned by get_userinfo_asobj
* @return boolean
*/
protected function is_user_suspended($user) {
if (!$this->config->suspended_attribute || !isset($user->suspended)) {
return false;
}
if ($this->config->suspended_attribute == 'useraccountcontrol' && $this->config->user_type == 'ad') {
return (bool)($user->suspended & AUTH_AD_ACCOUNTDISABLE);
}
return (bool)$user->suspended;
}
/**
* Test a DN
*
* @param resource $ldapconn
* @param string $dn The DN to check for existence
* @param string $message The identifier of a string as in get_string()
* @param string|object|array $a An object, string or number that can be used
* within translation strings as in get_string()
* @return true or a message in case of error
*/
private function test_dn($ldapconn, $dn, $message, $a = null) {
$ldapresult = @ldap_read($ldapconn, $dn, '(objectClass=*)', array());
if (!$ldapresult) {
if (ldap_errno($ldapconn) == 32) {
// No such object.
return get_string($message, 'auth_ldap', $a);
}
$a = array('code' => ldap_errno($ldapconn), 'subject' => $a, 'message' => ldap_error($ldapconn));
return get_string('diag_genericerror', 'auth_ldap', $a);
}
return true;
}
/**
* Test if settings are correct, print info to output.
*/
public function test_settings() {
global $OUTPUT;
if (!function_exists('ldap_connect')) { // Is php-ldap really there?
echo $OUTPUT->notification(get_string('auth_ldap_noextension', 'auth_ldap'), \core\output\notification::NOTIFY_ERROR);
return;
}
// Check to see if this is actually configured.
if (empty($this->config->host_url)) {
// LDAP is not even configured.
echo $OUTPUT->notification(get_string('ldapnotconfigured', 'auth_ldap'), \core\output\notification::NOTIFY_ERROR);
return;
}
if ($this->config->ldap_version != 3) {
echo $OUTPUT->notification(get_string('diag_toooldversion', 'auth_ldap'), \core\output\notification::NOTIFY_WARNING);
}
try {
$ldapconn = $this->ldap_connect();
} catch (Exception $e) {
echo $OUTPUT->notification($e->getMessage(), \core\output\notification::NOTIFY_ERROR);
return;
}
// Display paged file results.
if (!ldap_paged_results_supported($this->config->ldap_version, $ldapconn)) {
echo $OUTPUT->notification(get_string('pagedresultsnotsupp', 'auth_ldap'), \core\output\notification::NOTIFY_INFO);
}
// Check contexts.
foreach (explode(';', $this->config->contexts) as $context) {
$context = trim($context);
if (empty($context)) {
echo $OUTPUT->notification(get_string('diag_emptycontext', 'auth_ldap'), \core\output\notification::NOTIFY_WARNING);
continue;
}
$message = $this->test_dn($ldapconn, $context, 'diag_contextnotfound', $context);
if ($message !== true) {
echo $OUTPUT->notification($message, \core\output\notification::NOTIFY_WARNING);
}
}
// Create system role mapping field for each assignable system role.
$roles = get_ldap_assignable_role_names();
foreach ($roles as $role) {
foreach (explode(';', $this->config->{$role['settingname']}) as $groupdn) {
if (empty($groupdn)) {
continue;
}
$role['group'] = $groupdn;
$message = $this->test_dn($ldapconn, $groupdn, 'diag_rolegroupnotfound', $role);
if ($message !== true) {
echo $OUTPUT->notification($message, \core\output\notification::NOTIFY_WARNING);
}
}
}
$this->ldap_close(true);
// We were able to connect successfuly.
echo $OUTPUT->notification(get_string('connectingldapsuccess', 'auth_ldap'), \core\output\notification::NOTIFY_SUCCESS);
}
/**
* Get the list of profile fields.
*
* @param bool $fetchall Fetch all, not just those for update.
* @return array
*/
protected function get_profile_keys($fetchall = false) {
$keys = array_keys(get_object_vars($this->config));
$updatekeys = [];
foreach ($keys as $key) {
if (preg_match('/^field_updatelocal_(.+)$/', $key, $match)) {
// If we have a field to update it from and it must be updated 'onlogin' we update it on cron.
if (!empty($this->config->{'field_map_'.$match[1]})) {
if ($fetchall || $this->config->{$match[0]} === 'onlogin') {
array_push($updatekeys, $match[1]); // the actual key name
}
}
}
}
if ($this->config->suspended_attribute && $this->config->sync_suspended) {
$updatekeys[] = 'suspended';
}
return $updatekeys;
}
}