4 * @author Martin Dougiamas
5 * @author IƱaki Arenaza
6 * @license http://www.gnu.org/copyleft/gpl.html GNU Public License
7 * @package moodle multiauth
9 * Authentication Plugin: LDAP Authentication
11 * Authentication using LDAP (Lightweight Directory Access Protocol).
13 * 2006-08-28 File created.
16 if (!defined('MOODLE_INTERNAL')) {
17 die('Direct access to this script is forbidden.'); /// It must be included from a Moodle page
20 // See http://support.microsoft.com/kb/305144 to interprete these values.
21 if (!defined('AUTH_AD_ACCOUNTDISABLE')) {
22 define('AUTH_AD_ACCOUNTDISABLE', 0x0002);
24 if (!defined('AUTH_AD_NORMAL_ACCOUNT')) {
25 define('AUTH_AD_NORMAL_ACCOUNT', 0x0200);
27 if (!defined('AUTH_NTLMTIMEOUT')) { // timewindow for the NTLM SSO process, in secs...
28 define('AUTH_NTLMTIMEOUT', 10);
31 // UF_DONT_EXPIRE_PASSWD value taken from MSDN directly
32 if (!defined('UF_DONT_EXPIRE_PASSWD')) {
33 define ('UF_DONT_EXPIRE_PASSWD', 0x00010000);
36 // The Posix uid and gid of the 'nobody' account and 'nogroup' group.
37 if (!defined('AUTH_UID_NOBODY')) {
38 define('AUTH_UID_NOBODY', -2);
40 if (!defined('AUTH_GID_NOGROUP')) {
41 define('AUTH_GID_NOGROUP', -2);
44 // Regular expressions for a valid NTLM username and domain name.
45 if (!defined('AUTH_NTLM_VALID_USERNAME')) {
46 define('AUTH_NTLM_VALID_USERNAME', '[^/\\\\\\\\\[\]:;|=,+*?<>@"]+');
48 if (!defined('AUTH_NTLM_VALID_DOMAINNAME')) {
49 define('AUTH_NTLM_VALID_DOMAINNAME', '[^\\\\\\\\\/:*?"<>|]+');
51 // Default format for remote users if using NTLM SSO
52 if (!defined('AUTH_NTLM_DEFAULT_FORMAT')) {
53 define('AUTH_NTLM_DEFAULT_FORMAT', '%domain%\\%username%');
56 require_once($CFG->libdir.'/authlib.php');
57 require_once($CFG->libdir.'/ldaplib.php');
60 * LDAP authentication plugin.
62 class auth_plugin_ldap extends auth_plugin_base {
65 * Init plugin config from database settings depending on the plugin auth type.
67 function init_plugin($authtype) {
68 $this->pluginconfig = 'auth/'.$authtype;
69 $this->config = get_config($this->pluginconfig);
70 if (empty($this->config->ldapencoding)) {
71 $this->config->ldapencoding = 'utf-8';
73 if (empty($this->config->user_type)) {
74 $this->config->user_type = 'default';
77 $ldap_usertypes = ldap_supported_usertypes();
78 $this->config->user_type_name = $ldap_usertypes[$this->config->user_type];
79 unset($ldap_usertypes);
81 $default = ldap_getdefaults();
83 // Use defaults if values not given
84 foreach ($default as $key => $value) {
85 // watch out - 0, false are correct values too
86 if (!isset($this->config->{$key}) or $this->config->{$key} == '') {
87 $this->config->{$key} = $value[$this->config->user_type];
91 // Hack prefix to objectclass
92 if (empty($this->config->objectclass)) {
93 // Can't send empty filter
94 $this->config->objectclass = '(objectClass=*)';
95 } else if (stripos($this->config->objectclass, 'objectClass=') === 0) {
96 // Value is 'objectClass=some-string-here', so just add ()
97 // around the value (filter _must_ have them).
98 $this->config->objectclass = '('.$this->config->objectclass.')';
99 } else if (strpos($this->config->objectclass, '(') !== 0) {
100 // Value is 'some-string-not-starting-with-left-parentheses',
101 // which is assumed to be the objectClass matching value.
102 // So build a valid filter with it.
103 $this->config->objectclass = '(objectClass='.$this->config->objectclass.')';
105 // There is an additional possible value
106 // '(some-string-here)', that can be used to specify any
107 // valid filter string, to select subsets of users based
108 // on any criteria. For example, we could select the users
109 // whose objectClass is 'user' and have the
110 // 'enabledMoodleUser' attribute, with something like:
112 // (&(objectClass=user)(enabledMoodleUser=1))
114 // In this particular case we don't need to do anything,
115 // so leave $this->config->objectclass as is.
120 * Constructor with initialisation.
122 function auth_plugin_ldap() {
123 $this->authtype = 'ldap';
124 $this->roleauth = 'auth_ldap';
125 $this->errorlogtag = '[AUTH LDAP] ';
126 $this->init_plugin($this->authtype);
130 * Returns true if the username and password work and false if they are
131 * wrong or don't exist.
133 * @param string $username The username (without system magic quotes)
134 * @param string $password The password (without system magic quotes)
136 * @return bool Authentication success or failure.
138 function user_login($username, $password) {
139 if (! function_exists('ldap_bind')) {
140 print_error('auth_ldapnotinstalled', 'auth_ldap');
144 if (!$username or !$password) { // Don't allow blank usernames or passwords
148 $extusername = textlib::convert($username, 'utf-8', $this->config->ldapencoding);
149 $extpassword = textlib::convert($password, 'utf-8', $this->config->ldapencoding);
151 // Before we connect to LDAP, check if this is an AD SSO login
152 // if we succeed in this block, we'll return success early.
155 if (!empty($this->config->ntlmsso_enabled) && $key === $password) {
156 $cf = get_cache_flags($this->pluginconfig.'/ntlmsess');
157 // We only get the cache flag if we retrieve it before
158 // it expires (AUTH_NTLMTIMEOUT seconds).
159 if (!isset($cf[$key]) || $cf[$key] === '') {
163 $sessusername = $cf[$key];
164 if ($username === $sessusername) {
165 unset($sessusername);
168 // Check that the user is inside one of the configured LDAP contexts
170 $ldapconnection = $this->ldap_connect();
171 // if the user is not inside the configured contexts,
172 // ldap_find_userdn returns false.
173 if ($this->ldap_find_userdn($ldapconnection, $extusername)) {
178 // Shortcut here - SSO confirmed
181 } // End SSO processing
184 $ldapconnection = $this->ldap_connect();
185 $ldap_user_dn = $this->ldap_find_userdn($ldapconnection, $extusername);
187 // If ldap_user_dn is empty, user does not exist
188 if (!$ldap_user_dn) {
193 // Try to bind with current username and password
194 $ldap_login = @ldap_bind($ldapconnection, $ldap_user_dn, $extpassword);
203 * Reads user information from ldap and returns it in array()
205 * Function should return all information available. If you are saving
206 * this information to moodle user-table you should honor syncronization flags
208 * @param string $username username
210 * @return mixed array with no magic quotes or false on error
212 function get_userinfo($username) {
213 $extusername = textlib::convert($username, 'utf-8', $this->config->ldapencoding);
215 $ldapconnection = $this->ldap_connect();
216 if(!($user_dn = $this->ldap_find_userdn($ldapconnection, $extusername))) {
221 $search_attribs = array();
222 $attrmap = $this->ldap_attributes();
223 foreach ($attrmap as $key => $values) {
224 if (!is_array($values)) {
225 $values = array($values);
227 foreach ($values as $value) {
228 if (!in_array($value, $search_attribs)) {
229 array_push($search_attribs, $value);
234 if (!$user_info_result = ldap_read($ldapconnection, $user_dn, '(objectClass=*)', $search_attribs)) {
236 return false; // error!
239 $user_entry = ldap_get_entries_moodle($ldapconnection, $user_info_result);
240 if (empty($user_entry)) {
242 return false; // entry not found
246 foreach ($attrmap as $key => $values) {
247 if (!is_array($values)) {
248 $values = array($values);
251 foreach ($values as $value) {
252 $entry = array_change_key_case($user_entry[0], CASE_LOWER);
253 if (($value == 'dn') || ($value == 'distinguishedname')) {
254 $result[$key] = $user_dn;
257 if (!array_key_exists($value, $entry)) {
258 continue; // wrong data mapping!
260 if (is_array($entry[$value])) {
261 $newval = textlib::convert($entry[$value][0], $this->config->ldapencoding, 'utf-8');
263 $newval = textlib::convert($entry[$value], $this->config->ldapencoding, 'utf-8');
265 if (!empty($newval)) { // favour ldap entries that are set
269 if (!is_null($ldapval)) {
270 $result[$key] = $ldapval;
279 * Reads user information from ldap and returns it in an object
281 * @param string $username username (with system magic quotes)
282 * @return mixed object or false on error
284 function get_userinfo_asobj($username) {
285 $user_array = $this->get_userinfo($username);
286 if ($user_array == false) {
287 return false; //error or not found
289 $user_array = truncate_userinfo($user_array);
290 $user = new stdClass();
291 foreach ($user_array as $key=>$value) {
292 $user->{$key} = $value;
298 * Returns all usernames from LDAP
300 * get_userlist returns all usernames from LDAP
304 function get_userlist() {
305 return $this->ldap_get_userlist("({$this->config->user_attribute}=*)");
309 * Checks if user exists on LDAP
311 * @param string $username
313 function user_exists($username) {
314 $extusername = textlib::convert($username, 'utf-8', $this->config->ldapencoding);
316 // Returns true if given username exists on ldap
317 $users = $this->ldap_get_userlist('('.$this->config->user_attribute.'='.ldap_filter_addslashes($extusername).')');
318 return count($users);
322 * Creates a new user on LDAP.
323 * By using information in userobject
324 * Use user_exists to prevent duplicate usernames
326 * @param mixed $userobject Moodle userobject
327 * @param mixed $plainpass Plaintext password
329 function user_create($userobject, $plainpass) {
330 $extusername = textlib::convert($userobject->username, 'utf-8', $this->config->ldapencoding);
331 $extpassword = textlib::convert($plainpass, 'utf-8', $this->config->ldapencoding);
333 switch ($this->config->passtype) {
335 $extpassword = '{MD5}' . base64_encode(pack('H*', md5($extpassword)));
338 $extpassword = '{SHA}' . base64_encode(pack('H*', sha1($extpassword)));
345 $ldapconnection = $this->ldap_connect();
346 $attrmap = $this->ldap_attributes();
350 foreach ($attrmap as $key => $values) {
351 if (!is_array($values)) {
352 $values = array($values);
354 foreach ($values as $value) {
355 if (!empty($userobject->$key) ) {
356 $newuser[$value] = textlib::convert($userobject->$key, 'utf-8', $this->config->ldapencoding);
361 //Following sets all mandatory and other forced attribute values
362 //User should be creted as login disabled untill email confirmation is processed
363 //Feel free to add your user type and send patches to paca@sci.fi to add them
364 //Moodle distribution
366 switch ($this->config->user_type) {
368 $newuser['objectClass'] = array('inetOrgPerson', 'organizationalPerson', 'person', 'top');
369 $newuser['uniqueId'] = $extusername;
370 $newuser['logindisabled'] = 'TRUE';
371 $newuser['userpassword'] = $extpassword;
372 $uadd = ldap_add($ldapconnection, $this->config->user_attribute.'='.ldap_addslashes($extusername).','.$this->config->create_context, $newuser);
376 // posixAccount object class forces us to specify a uidNumber
377 // and a gidNumber. That is quite complicated to generate from
378 // Moodle without colliding with existing numbers and without
379 // race conditions. As this user is supposed to be only used
380 // with Moodle (otherwise the user would exist beforehand) and
381 // doesn't need to login into a operating system, we assign the
382 // user the uid of user 'nobody' and gid of group 'nogroup'. In
383 // addition to that, we need to specify a home directory. We
384 // use the root directory ('/') as the home directory, as this
385 // is the only one can always be sure exists. Finally, even if
386 // it's not mandatory, we specify '/bin/false' as the login
387 // shell, to prevent the user from login in at the operating
388 // system level (Moodle ignores this).
390 $newuser['objectClass'] = array('posixAccount', 'inetOrgPerson', 'organizationalPerson', 'person', 'top');
391 $newuser['cn'] = $extusername;
392 $newuser['uid'] = $extusername;
393 $newuser['uidNumber'] = AUTH_UID_NOBODY;
394 $newuser['gidNumber'] = AUTH_GID_NOGROUP;
395 $newuser['homeDirectory'] = '/';
396 $newuser['loginShell'] = '/bin/false';
399 // We have to create the account locked, but posixAccount has
400 // no attribute to achive this reliably. So we are going to
401 // modify the password in a reversable way that we can later
402 // revert in user_activate().
404 // Beware that this can be defeated by the user if we are not
405 // using MD5 or SHA-1 passwords. After all, the source code of
406 // Moodle is available, and the user can see the kind of
407 // modification we are doing and 'undo' it by hand (but only
408 // if we are using plain text passwords).
410 // Also bear in mind that you need to use a binding user that
411 // can create accounts and has read/write privileges on the
412 // 'userPassword' attribute for this to work.
414 $newuser['userPassword'] = '*'.$extpassword;
415 $uadd = ldap_add($ldapconnection, $this->config->user_attribute.'='.ldap_addslashes($extusername).','.$this->config->create_context, $newuser);
418 // User account creation is a two step process with AD. First you
419 // create the user object, then you set the password. If you try
420 // to set the password while creating the user, the operation
423 // Passwords in Active Directory must be encoded as Unicode
424 // strings (UCS-2 Little Endian format) and surrounded with
425 // double quotes. See http://support.microsoft.com/?kbid=269190
426 if (!function_exists('mb_convert_encoding')) {
427 print_error('auth_ldap_no_mbstring', 'auth_ldap');
430 // Check for invalid sAMAccountName characters.
431 if (preg_match('#[/\\[\]:;|=,+*?<>@"]#', $extusername)) {
432 print_error ('auth_ldap_ad_invalidchars', 'auth_ldap');
435 // First create the user account, and mark it as disabled.
436 $newuser['objectClass'] = array('top', 'person', 'user', 'organizationalPerson');
437 $newuser['sAMAccountName'] = $extusername;
438 $newuser['userAccountControl'] = AUTH_AD_NORMAL_ACCOUNT |
439 AUTH_AD_ACCOUNTDISABLE;
440 $userdn = 'cn='.ldap_addslashes($extusername).','.$this->config->create_context;
441 if (!ldap_add($ldapconnection, $userdn, $newuser)) {
442 print_error('auth_ldap_ad_create_req', 'auth_ldap');
445 // Now set the password
447 $newuser['unicodePwd'] = mb_convert_encoding('"' . $extpassword . '"',
449 if(!ldap_modify($ldapconnection, $userdn, $newuser)) {
450 // Something went wrong: delete the user account and error out
451 ldap_delete ($ldapconnection, $userdn);
452 print_error('auth_ldap_ad_create_req', 'auth_ldap');
457 print_error('auth_ldap_unsupportedusertype', 'auth_ldap', '', $this->config->user_type_name);
464 * Returns true if plugin allows resetting of password from moodle.
468 function can_reset_password() {
469 return !empty($this->config->stdchangepassword);
473 * Returns true if plugin allows signup and user creation.
477 function can_signup() {
478 return (!empty($this->config->auth_user_create) and !empty($this->config->create_context));
482 * Sign up a new user ready for confirmation.
483 * Password is passed in plaintext.
485 * @param object $user new user object
486 * @param boolean $notify print notice with link and terminate
488 function user_signup($user, $notify=true) {
489 global $CFG, $DB, $PAGE, $OUTPUT;
491 require_once($CFG->dirroot.'/user/profile/lib.php');
493 if ($this->user_exists($user->username)) {
494 print_error('auth_ldap_user_exists', 'auth_ldap');
497 $plainslashedpassword = $user->password;
498 unset($user->password);
500 if (! $this->user_create($user, $plainslashedpassword)) {
501 print_error('auth_ldap_create_error', 'auth_ldap');
504 $user->id = $DB->insert_record('user', $user);
506 // Save any custom profile field information
507 profile_save_data($user);
509 $this->update_user_record($user->username);
510 update_internal_user_password($user, $plainslashedpassword);
512 $user = $DB->get_record('user', array('id'=>$user->id));
513 events_trigger('user_created', $user);
515 if (! send_confirmation_email($user)) {
516 print_error('noemail', 'auth_ldap');
520 $emailconfirm = get_string('emailconfirm');
521 $PAGE->set_url('/auth/ldap/auth.php');
522 $PAGE->navbar->add($emailconfirm);
523 $PAGE->set_title($emailconfirm);
524 $PAGE->set_heading($emailconfirm);
525 echo $OUTPUT->header();
526 notice(get_string('emailconfirmsent', '', $user->email), "{$CFG->wwwroot}/index.php");
533 * Returns true if plugin allows confirming of new users.
537 function can_confirm() {
538 return $this->can_signup();
542 * Confirm the new user as registered.
544 * @param string $username
545 * @param string $confirmsecret
547 function user_confirm($username, $confirmsecret) {
550 $user = get_complete_user_data('username', $username);
553 if ($user->confirmed) {
554 return AUTH_CONFIRM_ALREADY;
556 } else if ($user->auth != $this->authtype) {
557 return AUTH_CONFIRM_ERROR;
559 } else if ($user->secret == $confirmsecret) { // They have provided the secret key to get in
560 if (!$this->user_activate($username)) {
561 return AUTH_CONFIRM_FAIL;
563 $DB->set_field('user', 'confirmed', 1, array('id'=>$user->id));
564 if ($user->firstaccess == 0) {
565 $DB->set_field('user', 'firstaccess', time(), array('id'=>$user->id));
567 return AUTH_CONFIRM_OK;
570 return AUTH_CONFIRM_ERROR;
575 * Return number of days to user password expires
577 * If userpassword does not expire it should return 0. If password is already expired
578 * it should return negative value.
580 * @param mixed $username username
583 function password_expire($username) {
586 $extusername = textlib::convert($username, 'utf-8', $this->config->ldapencoding);
588 $ldapconnection = $this->ldap_connect();
589 $user_dn = $this->ldap_find_userdn($ldapconnection, $extusername);
590 $search_attribs = array($this->config->expireattr);
591 $sr = ldap_read($ldapconnection, $user_dn, '(objectClass=*)', $search_attribs);
593 $info = ldap_get_entries_moodle($ldapconnection, $sr);
594 if (!empty ($info)) {
595 $info = array_change_key_case($info[0], CASE_LOWER);
596 if (!empty($info[$this->config->expireattr][0])) {
597 $expiretime = $this->ldap_expirationtime2unix($info[$this->config->expireattr][0], $ldapconnection, $user_dn);
598 if ($expiretime != 0) {
600 if ($expiretime > $now) {
601 $result = ceil(($expiretime - $now) / DAYSECS);
603 $result = floor(($expiretime - $now) / DAYSECS);
609 error_log($this->errorlogtag.get_string('didtfindexpiretime', 'auth_ldap'));
616 * Syncronizes user fron external LDAP server to moodle user table
618 * Sync is now using username attribute.
620 * Syncing users removes or suspends users that dont exists anymore in external LDAP.
621 * Creates new users and updates coursecreator status of users.
623 * @param bool $do_updates will do pull in data updates from LDAP if relevant
625 function sync_users($do_updates=true) {
628 print_string('connectingldap', 'auth_ldap');
629 $ldapconnection = $this->ldap_connect();
631 $dbman = $DB->get_manager();
633 /// Define table user to be created
634 $table = new xmldb_table('tmp_extuser');
635 $table->add_field('id', XMLDB_TYPE_INTEGER, '10', XMLDB_UNSIGNED, XMLDB_NOTNULL, XMLDB_SEQUENCE, null);
636 $table->add_field('username', XMLDB_TYPE_CHAR, '100', null, XMLDB_NOTNULL, null, null);
637 $table->add_field('mnethostid', XMLDB_TYPE_INTEGER, '10', XMLDB_UNSIGNED, XMLDB_NOTNULL, null, null);
638 $table->add_key('primary', XMLDB_KEY_PRIMARY, array('id'));
639 $table->add_index('username', XMLDB_INDEX_UNIQUE, array('mnethostid', 'username'));
641 print_string('creatingtemptable', 'auth_ldap', 'tmp_extuser');
642 $dbman->create_temp_table($table);
645 //// get user's list from ldap to sql in a scalable fashion
647 // prepare some data we'll need
648 $filter = '(&('.$this->config->user_attribute.'=*)'.$this->config->objectclass.')';
650 $contexts = explode(';', $this->config->contexts);
652 if (!empty($this->config->create_context)) {
653 array_push($contexts, $this->config->create_context);
656 $ldap_pagedresults = ldap_paged_results_supported($this->config->ldap_version);
658 foreach ($contexts as $context) {
659 $context = trim($context);
660 if (empty($context)) {
665 if ($ldap_pagedresults) {
666 ldap_control_paged_result($ldapconnection, $this->config->pagesize, true, $ldap_cookie);
668 if ($this->config->search_sub) {
669 // Use ldap_search to find first user from subtree.
670 $ldap_result = ldap_search($ldapconnection, $context, $filter, array($this->config->user_attribute));
672 // Search only in this context.
673 $ldap_result = ldap_list($ldapconnection, $context, $filter, array($this->config->user_attribute));
678 if ($ldap_pagedresults) {
679 ldap_control_paged_result_response($ldapconnection, $ldap_result, $ldap_cookie);
681 if ($entry = @ldap_first_entry($ldapconnection, $ldap_result)) {
683 $value = ldap_get_values_len($ldapconnection, $entry, $this->config->user_attribute);
684 $value = textlib::convert($value[0], $this->config->ldapencoding, 'utf-8');
685 $this->ldap_bulk_insert($value);
686 } while ($entry = ldap_next_entry($ldapconnection, $entry));
688 unset($ldap_result); // Free mem.
689 } while ($ldap_pagedresults && !empty($ldap_cookie));
692 // If LDAP paged results were used, the current connection must be completely
693 // closed and a new one created, to work without paged results from here on.
694 if ($ldap_pagedresults) {
695 $this->ldap_close(true);
696 $ldapconnection = $this->ldap_connect();
699 /// preserve our user database
700 /// if the temp table is empty, it probably means that something went wrong, exit
701 /// so as to avoid mass deletion of users; which is hard to undo
702 $count = $DB->count_records_sql('SELECT COUNT(username) AS count, 1 FROM {tmp_extuser}');
704 print_string('didntgetusersfromldap', 'auth_ldap');
707 print_string('gotcountrecordsfromldap', 'auth_ldap', $count);
712 // Find users in DB that aren't in ldap -- to be removed!
713 // this is still not as scalable (but how often do we mass delete?)
714 if ($this->config->removeuser != AUTH_REMOVEUSER_KEEP) {
717 LEFT JOIN {tmp_extuser} e ON (u.username = e.username AND u.mnethostid = e.mnethostid)
720 AND e.username IS NULL';
721 $remove_users = $DB->get_records_sql($sql, array($this->authtype));
723 if (!empty($remove_users)) {
724 print_string('userentriestoremove', 'auth_ldap', count($remove_users));
726 foreach ($remove_users as $user) {
727 if ($this->config->removeuser == AUTH_REMOVEUSER_FULLDELETE) {
728 if (delete_user($user)) {
729 echo "\t"; print_string('auth_dbdeleteuser', 'auth_db', array('name'=>$user->username, 'id'=>$user->id)); echo "\n";
731 echo "\t"; print_string('auth_dbdeleteusererror', 'auth_db', $user->username); echo "\n";
733 } else if ($this->config->removeuser == AUTH_REMOVEUSER_SUSPEND) {
734 $updateuser = new stdClass();
735 $updateuser->id = $user->id;
736 $updateuser->auth = 'nologin';
737 $DB->update_record('user', $updateuser);
738 echo "\t"; print_string('auth_dbsuspenduser', 'auth_db', array('name'=>$user->username, 'id'=>$user->id)); echo "\n";
742 print_string('nouserentriestoremove', 'auth_ldap');
744 unset($remove_users); // free mem!
747 /// Revive suspended users
748 if (!empty($this->config->removeuser) and $this->config->removeuser == AUTH_REMOVEUSER_SUSPEND) {
749 $sql = "SELECT u.id, u.username
751 JOIN {tmp_extuser} e ON (u.username = e.username AND u.mnethostid = e.mnethostid)
752 WHERE u.auth = 'nologin' AND u.deleted = 0";
753 $revive_users = $DB->get_records_sql($sql);
755 if (!empty($revive_users)) {
756 print_string('userentriestorevive', 'auth_ldap', count($revive_users));
758 foreach ($revive_users as $user) {
759 $updateuser = new stdClass();
760 $updateuser->id = $user->id;
761 $updateuser->auth = $this->authtype;
762 $DB->update_record('user', $updateuser);
763 echo "\t"; print_string('auth_dbreviveduser', 'auth_db', array('name'=>$user->username, 'id'=>$user->id)); echo "\n";
766 print_string('nouserentriestorevive', 'auth_ldap');
769 unset($revive_users);
773 /// User Updates - time-consuming (optional)
775 // Narrow down what fields we need to update
776 $all_keys = array_keys(get_object_vars($this->config));
777 $updatekeys = array();
778 foreach ($all_keys as $key) {
779 if (preg_match('/^field_updatelocal_(.+)$/', $key, $match)) {
780 // If we have a field to update it from
781 // and it must be updated 'onlogin' we
783 if (!empty($this->config->{'field_map_'.$match[1]})
784 and $this->config->{$match[0]} === 'onlogin') {
785 array_push($updatekeys, $match[1]); // the actual key name
789 unset($all_keys); unset($key);
792 print_string('noupdatestobedone', 'auth_ldap');
794 if ($do_updates and !empty($updatekeys)) { // run updates only if relevant
795 $users = $DB->get_records_sql('SELECT u.username, u.id
797 WHERE u.deleted = 0 AND u.auth = ? AND u.mnethostid = ?',
798 array($this->authtype, $CFG->mnet_localhost_id));
799 if (!empty($users)) {
800 print_string('userentriestoupdate', 'auth_ldap', count($users));
802 $sitecontext = context_system::instance();
803 if (!empty($this->config->creators) and !empty($this->config->memberattribute)
804 and $roles = get_archetype_roles('coursecreator')) {
805 $creatorrole = array_shift($roles); // We can only use one, let's use the first one
807 $creatorrole = false;
810 $transaction = $DB->start_delegated_transaction();
814 foreach ($users as $user) {
815 echo "\t"; print_string('auth_dbupdatinguser', 'auth_db', array('name'=>$user->username, 'id'=>$user->id));
816 if (!$this->update_user_record($user->username, $updatekeys)) {
817 echo ' - '.get_string('skipped');
822 // Update course creators if needed
823 if ($creatorrole !== false) {
824 if ($this->iscreator($user->username)) {
825 role_assign($creatorrole->id, $user->id, $sitecontext->id, $this->roleauth);
827 role_unassign($creatorrole->id, $user->id, $sitecontext->id, $this->roleauth);
831 $transaction->allow_commit();
832 unset($users); // free mem
834 } else { // end do updates
835 print_string('noupdatestobedone', 'auth_ldap');
839 // Find users missing in DB that are in LDAP
840 // and gives me a nifty object I don't want.
841 // note: we do not care about deleted accounts anymore, this feature was replaced by suspending to nologin auth plugin
842 $sql = 'SELECT e.id, e.username
844 LEFT JOIN {user} u ON (e.username = u.username AND e.mnethostid = u.mnethostid)
846 $add_users = $DB->get_records_sql($sql);
848 if (!empty($add_users)) {
849 print_string('userentriestoadd', 'auth_ldap', count($add_users));
851 $sitecontext = context_system::instance();
852 if (!empty($this->config->creators) and !empty($this->config->memberattribute)
853 and $roles = get_archetype_roles('coursecreator')) {
854 $creatorrole = array_shift($roles); // We can only use one, let's use the first one
856 $creatorrole = false;
859 $transaction = $DB->start_delegated_transaction();
860 foreach ($add_users as $user) {
861 $user = $this->get_userinfo_asobj($user->username);
864 $user->modified = time();
865 $user->confirmed = 1;
866 $user->auth = $this->authtype;
867 $user->mnethostid = $CFG->mnet_localhost_id;
868 // get_userinfo_asobj() might have replaced $user->username with the value
869 // from the LDAP server (which can be mixed-case). Make sure it's lowercase
870 $user->username = trim(textlib::strtolower($user->username));
871 if (empty($user->lang)) {
872 $user->lang = $CFG->lang;
875 $id = $DB->insert_record('user', $user);
876 echo "\t"; print_string('auth_dbinsertuser', 'auth_db', array('name'=>$user->username, 'id'=>$id)); echo "\n";
877 if (!empty($this->config->forcechangepassword)) {
878 set_user_preference('auth_forcepasswordchange', 1, $id);
881 // Add course creators if needed
882 if ($creatorrole !== false and $this->iscreator($user->username)) {
883 role_assign($creatorrole->id, $id, $sitecontext->id, $this->roleauth);
887 $transaction->allow_commit();
888 unset($add_users); // free mem
890 print_string('nouserstobeadded', 'auth_ldap');
893 $dbman->drop_table($table);
900 * Update a local user record from an external source.
901 * This is a lighter version of the one in moodlelib -- won't do
902 * expensive ops such as enrolment.
904 * If you don't pass $updatekeys, there is a performance hit and
905 * values removed from LDAP won't be removed from moodle.
907 * @param string $username username
908 * @param boolean $updatekeys true to update the local record with the external LDAP values.
910 function update_user_record($username, $updatekeys = false) {
913 // Just in case check text case
914 $username = trim(textlib::strtolower($username));
916 // Get the current user record
917 $user = $DB->get_record('user', array('username'=>$username, 'mnethostid'=>$CFG->mnet_localhost_id));
918 if (empty($user)) { // trouble
919 error_log($this->errorlogtag.get_string('auth_dbusernotexist', 'auth_db', '', $username));
920 print_error('auth_dbusernotexist', 'auth_db', '', $username);
924 // Protect the userid from being overwritten
927 if ($newinfo = $this->get_userinfo($username)) {
928 $newinfo = truncate_userinfo($newinfo);
930 if (empty($updatekeys)) { // all keys? this does not support removing values
931 $updatekeys = array_keys($newinfo);
934 foreach ($updatekeys as $key) {
935 if (isset($newinfo[$key])) {
936 $value = $newinfo[$key];
941 if (!empty($this->config->{'field_updatelocal_' . $key})) {
942 if ($user->{$key} != $value) { // only update if it's changed
943 $DB->set_field('user', $key, $value, array('id'=>$userid));
950 return $DB->get_record('user', array('id'=>$userid, 'deleted'=>0));
954 * Bulk insert in SQL's temp table
956 function ldap_bulk_insert($username) {
959 $username = textlib::strtolower($username); // usernames are __always__ lowercase.
960 $DB->insert_record_raw('tmp_extuser', array('username'=>$username,
961 'mnethostid'=>$CFG->mnet_localhost_id), false, true);
966 * Activates (enables) user in external LDAP so user can login
968 * @param mixed $username
969 * @return boolean result
971 function user_activate($username) {
972 $extusername = textlib::convert($username, 'utf-8', $this->config->ldapencoding);
974 $ldapconnection = $this->ldap_connect();
976 $userdn = $this->ldap_find_userdn($ldapconnection, $extusername);
977 switch ($this->config->user_type) {
979 $newinfo['loginDisabled'] = 'FALSE';
983 // Remember that we add a '*' character in front of the
984 // external password string to 'disable' the account. We just
985 // need to remove it.
986 $sr = ldap_read($ldapconnection, $userdn, '(objectClass=*)',
987 array('userPassword'));
988 $info = ldap_get_entries($ldapconnection, $sr);
989 $info[0] = array_change_key_case($info[0], CASE_LOWER);
990 $newinfo['userPassword'] = ltrim($info[0]['userpassword'][0], '*');
993 // We need to unset the ACCOUNTDISABLE bit in the
994 // userAccountControl attribute ( see
995 // http://support.microsoft.com/kb/305144 )
996 $sr = ldap_read($ldapconnection, $userdn, '(objectClass=*)',
997 array('userAccountControl'));
998 $info = ldap_get_entries($ldapconnection, $sr);
999 $info[0] = array_change_key_case($info[0], CASE_LOWER);
1000 $newinfo['userAccountControl'] = $info[0]['useraccountcontrol'][0]
1001 & (~AUTH_AD_ACCOUNTDISABLE);
1004 print_error('user_activatenotsupportusertype', 'auth_ldap', '', $this->config->user_type_name);
1006 $result = ldap_modify($ldapconnection, $userdn, $newinfo);
1007 $this->ldap_close();
1012 * Returns true if user should be coursecreator.
1014 * @param mixed $username username (without system magic quotes)
1015 * @return mixed result null if course creators is not configured, boolean otherwise.
1017 function iscreator($username) {
1018 if (empty($this->config->creators) or empty($this->config->memberattribute)) {
1022 $extusername = textlib::convert($username, 'utf-8', $this->config->ldapencoding);
1024 $ldapconnection = $this->ldap_connect();
1026 if ($this->config->memberattribute_isdn) {
1027 if(!($userid = $this->ldap_find_userdn($ldapconnection, $extusername))) {
1031 $userid = $extusername;
1034 $group_dns = explode(';', $this->config->creators);
1035 $creator = ldap_isgroupmember($ldapconnection, $userid, $group_dns, $this->config->memberattribute);
1037 $this->ldap_close();
1043 * Called when the user record is updated.
1045 * Modifies user in external LDAP server. It takes olduser (before
1046 * changes) and newuser (after changes) compares information and
1047 * saves modified information to external LDAP server.
1049 * @param mixed $olduser Userobject before modifications (without system magic quotes)
1050 * @param mixed $newuser Userobject new modified userobject (without system magic quotes)
1051 * @return boolean result
1054 function user_update($olduser, $newuser) {
1057 if (isset($olduser->username) and isset($newuser->username) and $olduser->username != $newuser->username) {
1058 error_log($this->errorlogtag.get_string('renamingnotallowed', 'auth_ldap'));
1062 if (isset($olduser->auth) and $olduser->auth != $this->authtype) {
1063 return true; // just change auth and skip update
1066 $attrmap = $this->ldap_attributes();
1067 // Before doing anything else, make sure we really need to update anything
1068 // in the external LDAP server.
1069 $update_external = false;
1070 foreach ($attrmap as $key => $ldapkeys) {
1071 if (!empty($this->config->{'field_updateremote_'.$key})) {
1072 $update_external = true;
1076 if (!$update_external) {
1080 $extoldusername = textlib::convert($olduser->username, 'utf-8', $this->config->ldapencoding);
1082 $ldapconnection = $this->ldap_connect();
1084 $search_attribs = array();
1085 foreach ($attrmap as $key => $values) {
1086 if (!is_array($values)) {
1087 $values = array($values);
1089 foreach ($values as $value) {
1090 if (!in_array($value, $search_attribs)) {
1091 array_push($search_attribs, $value);
1096 if(!($user_dn = $this->ldap_find_userdn($ldapconnection, $extoldusername))) {
1100 $user_info_result = ldap_read($ldapconnection, $user_dn, '(objectClass=*)', $search_attribs);
1101 if ($user_info_result) {
1102 $user_entry = ldap_get_entries_moodle($ldapconnection, $user_info_result);
1103 if (empty($user_entry)) {
1104 $attribs = join (', ', $search_attribs);
1105 error_log($this->errorlogtag.get_string('updateusernotfound', 'auth_ldap',
1106 array('userdn'=>$user_dn,
1107 'attribs'=>$attribs)));
1108 return false; // old user not found!
1109 } else if (count($user_entry) > 1) {
1110 error_log($this->errorlogtag.get_string('morethanoneuser', 'auth_ldap'));
1114 $user_entry = array_change_key_case($user_entry[0], CASE_LOWER);
1116 foreach ($attrmap as $key => $ldapkeys) {
1117 // Only process if the moodle field ($key) has changed and we
1118 // are set to update LDAP with it
1119 if (isset($olduser->$key) and isset($newuser->$key)
1120 and $olduser->$key !== $newuser->$key
1121 and !empty($this->config->{'field_updateremote_'. $key})) {
1122 // For ldap values that could be in more than one
1123 // ldap key, we will do our best to match
1124 // where they came from
1127 if (!is_array($ldapkeys)) {
1128 $ldapkeys = array($ldapkeys);
1130 if (count($ldapkeys) < 2) {
1134 $nuvalue = textlib::convert($newuser->$key, 'utf-8', $this->config->ldapencoding);
1135 empty($nuvalue) ? $nuvalue = array() : $nuvalue;
1136 $ouvalue = textlib::convert($olduser->$key, 'utf-8', $this->config->ldapencoding);
1138 foreach ($ldapkeys as $ldapkey) {
1139 $ldapkey = $ldapkey;
1140 $ldapvalue = $user_entry[$ldapkey][0];
1142 // Skip update if the values already match
1143 if ($nuvalue !== $ldapvalue) {
1144 // This might fail due to schema validation
1145 if (@ldap_modify($ldapconnection, $user_dn, array($ldapkey => $nuvalue))) {
1148 error_log($this->errorlogtag.get_string ('updateremfail', 'auth_ldap',
1149 array('errno'=>ldap_errno($ldapconnection),
1150 'errstring'=>ldap_err2str(ldap_errno($ldapconnection)),
1152 'ouvalue'=>$ouvalue,
1153 'nuvalue'=>$nuvalue)));
1158 // Ambiguous. Value empty before in Moodle (and LDAP) - use
1159 // 1st ldap candidate field, no need to guess
1160 if ($ouvalue === '') { // value empty before - use 1st ldap candidate
1161 // This might fail due to schema validation
1162 if (@ldap_modify($ldapconnection, $user_dn, array($ldapkey => $nuvalue))) {
1166 error_log($this->errorlogtag.get_string ('updateremfail', 'auth_ldap',
1167 array('errno'=>ldap_errno($ldapconnection),
1168 'errstring'=>ldap_err2str(ldap_errno($ldapconnection)),
1170 'ouvalue'=>$ouvalue,
1171 'nuvalue'=>$nuvalue)));
1176 // We found which ldap key to update!
1177 if ($ouvalue !== '' and $ouvalue === $ldapvalue ) {
1178 // This might fail due to schema validation
1179 if (@ldap_modify($ldapconnection, $user_dn, array($ldapkey => $nuvalue))) {
1183 error_log($this->errorlogtag.get_string ('updateremfail', 'auth_ldap',
1184 array('errno'=>ldap_errno($ldapconnection),
1185 'errstring'=>ldap_err2str(ldap_errno($ldapconnection)),
1187 'ouvalue'=>$ouvalue,
1188 'nuvalue'=>$nuvalue)));
1195 if ($ambiguous and !$changed) {
1196 error_log($this->errorlogtag.get_string ('updateremfailamb', 'auth_ldap',
1198 'ouvalue'=>$ouvalue,
1199 'nuvalue'=>$nuvalue)));
1204 error_log($this->errorlogtag.get_string ('usernotfound', 'auth_ldap'));
1205 $this->ldap_close();
1209 $this->ldap_close();
1215 * Changes userpassword in LDAP
1217 * Called when the user password is updated. It assumes it is
1218 * called by an admin or that you've otherwise checked the user's
1221 * @param object $user User table object
1222 * @param string $newpassword Plaintext password (not crypted/md5'ed)
1223 * @return boolean result
1226 function user_update_password($user, $newpassword) {
1230 $username = $user->username;
1232 $extusername = textlib::convert($username, 'utf-8', $this->config->ldapencoding);
1233 $extpassword = textlib::convert($newpassword, 'utf-8', $this->config->ldapencoding);
1235 switch ($this->config->passtype) {
1237 $extpassword = '{MD5}' . base64_encode(pack('H*', md5($extpassword)));
1240 $extpassword = '{SHA}' . base64_encode(pack('H*', sha1($extpassword)));
1247 $ldapconnection = $this->ldap_connect();
1249 $user_dn = $this->ldap_find_userdn($ldapconnection, $extusername);
1252 error_log($this->errorlogtag.get_string ('nodnforusername', 'auth_ldap', $user->username));
1256 switch ($this->config->user_type) {
1259 $result = ldap_modify($ldapconnection, $user_dn, array('userPassword' => $extpassword));
1261 error_log($this->errorlogtag.get_string ('updatepasserror', 'auth_ldap',
1262 array('errno'=>ldap_errno($ldapconnection),
1263 'errstring'=>ldap_err2str(ldap_errno($ldapconnection)))));
1265 // Update password expiration time, grace logins count
1266 $search_attribs = array($this->config->expireattr, 'passwordExpirationInterval', 'loginGraceLimit');
1267 $sr = ldap_read($ldapconnection, $user_dn, '(objectClass=*)', $search_attribs);
1269 $entry = ldap_get_entries_moodle($ldapconnection, $sr);
1270 $info = array_change_key_case($entry[0], CASE_LOWER);
1271 $newattrs = array();
1272 if (!empty($info[$this->config->expireattr][0])) {
1273 // Set expiration time only if passwordExpirationInterval is defined
1274 if (!empty($info['passwordexpirationinterval'][0])) {
1275 $expirationtime = time() + $info['passwordexpirationinterval'][0];
1276 $ldapexpirationtime = $this->ldap_unix2expirationtime($expirationtime);
1277 $newattrs['passwordExpirationTime'] = $ldapexpirationtime;
1280 // Set gracelogin count
1281 if (!empty($info['logingracelimit'][0])) {
1282 $newattrs['loginGraceRemaining']= $info['logingracelimit'][0];
1285 // Store attribute changes in LDAP
1286 $result = ldap_modify($ldapconnection, $user_dn, $newattrs);
1288 error_log($this->errorlogtag.get_string ('updatepasserrorexpiregrace', 'auth_ldap',
1289 array('errno'=>ldap_errno($ldapconnection),
1290 'errstring'=>ldap_err2str(ldap_errno($ldapconnection)))));
1295 error_log($this->errorlogtag.get_string ('updatepasserrorexpire', 'auth_ldap',
1296 array('errno'=>ldap_errno($ldapconnection),
1297 'errstring'=>ldap_err2str(ldap_errno($ldapconnection)))));
1302 // Passwords in Active Directory must be encoded as Unicode
1303 // strings (UCS-2 Little Endian format) and surrounded with
1304 // double quotes. See http://support.microsoft.com/?kbid=269190
1305 if (!function_exists('mb_convert_encoding')) {
1306 error_log($this->errorlogtag.get_string ('needmbstring', 'auth_ldap'));
1309 $extpassword = mb_convert_encoding('"'.$extpassword.'"', "UCS-2LE", $this->config->ldapencoding);
1310 $result = ldap_modify($ldapconnection, $user_dn, array('unicodePwd' => $extpassword));
1312 error_log($this->errorlogtag.get_string ('updatepasserror', 'auth_ldap',
1313 array('errno'=>ldap_errno($ldapconnection),
1314 'errstring'=>ldap_err2str(ldap_errno($ldapconnection)))));
1319 // Send LDAP the password in cleartext, it will md5 it itself
1320 $result = ldap_modify($ldapconnection, $user_dn, array('userPassword' => $extpassword));
1322 error_log($this->errorlogtag.get_string ('updatepasserror', 'auth_ldap',
1323 array('errno'=>ldap_errno($ldapconnection),
1324 'errstring'=>ldap_err2str(ldap_errno($ldapconnection)))));
1329 $this->ldap_close();
1334 * Take expirationtime and return it as unix timestamp in seconds
1336 * Takes expiration timestamp as read from LDAP and returns it as unix timestamp in seconds
1337 * Depends on $this->config->user_type variable
1339 * @param mixed time Time stamp read from LDAP as it is.
1340 * @param string $ldapconnection Only needed for Active Directory.
1341 * @param string $user_dn User distinguished name for the user we are checking password expiration (only needed for Active Directory).
1344 function ldap_expirationtime2unix ($time, $ldapconnection, $user_dn) {
1346 switch ($this->config->user_type) {
1348 $yr=substr($time, 0, 4);
1349 $mo=substr($time, 4, 2);
1350 $dt=substr($time, 6, 2);
1351 $hr=substr($time, 8, 2);
1352 $min=substr($time, 10, 2);
1353 $sec=substr($time, 12, 2);
1354 $result = mktime($hr, $min, $sec, $mo, $dt, $yr);
1358 $result = $time * DAYSECS; // The shadowExpire contains the number of DAYS between 01/01/1970 and the actual expiration date
1361 $result = $this->ldap_get_ad_pwdexpire($time, $ldapconnection, $user_dn);
1364 print_error('auth_ldap_usertypeundefined', 'auth_ldap');
1370 * Takes unix timestamp and returns it formated for storing in LDAP
1372 * @param integer unix time stamp
1374 function ldap_unix2expirationtime($time) {
1376 switch ($this->config->user_type) {
1378 $result=date('YmdHis', $time).'Z';
1382 $result = $time ; // Already in correct format
1385 print_error('auth_ldap_usertypeundefined2', 'auth_ldap');
1392 * Returns user attribute mappings between moodle and LDAP
1397 function ldap_attributes () {
1398 $moodleattributes = array();
1399 foreach ($this->userfields as $field) {
1400 if (!empty($this->config->{"field_map_$field"})) {
1401 $moodleattributes[$field] = textlib::strtolower(trim($this->config->{"field_map_$field"}));
1402 if (preg_match('/,/', $moodleattributes[$field])) {
1403 $moodleattributes[$field] = explode(',', $moodleattributes[$field]); // split ?
1407 $moodleattributes['username'] = textlib::strtolower(trim($this->config->user_attribute));
1408 return $moodleattributes;
1412 * Returns all usernames from LDAP
1414 * @param $filter An LDAP search filter to select desired users
1415 * @return array of LDAP user names converted to UTF-8
1417 function ldap_get_userlist($filter='*') {
1420 $ldapconnection = $this->ldap_connect();
1422 if ($filter == '*') {
1423 $filter = '(&('.$this->config->user_attribute.'=*)'.$this->config->objectclass.')';
1426 $contexts = explode(';', $this->config->contexts);
1427 if (!empty($this->config->create_context)) {
1428 array_push($contexts, $this->config->create_context);
1431 $ldap_pagedresults = ldap_paged_results_supported($this->config->ldap_version);
1432 foreach ($contexts as $context) {
1433 $context = trim($context);
1434 if (empty($context)) {
1439 if ($ldap_pagedresults) {
1440 ldap_control_paged_result($ldapconnection, $this->config->pagesize, true, $ldap_cookie);
1442 if ($this->config->search_sub) {
1443 // Use ldap_search to find first user from subtree.
1444 $ldap_result = ldap_search($ldapconnection, $context, $filter, array($this->config->user_attribute));
1446 // Search only in this context.
1447 $ldap_result = ldap_list($ldapconnection, $context, $filter, array($this->config->user_attribute));
1452 if ($ldap_pagedresults) {
1453 ldap_control_paged_result_response($ldapconnection, $ldap_result, $ldap_cookie);
1455 $users = ldap_get_entries_moodle($ldapconnection, $ldap_result);
1456 // Add found users to list.
1457 for ($i = 0; $i < count($users); $i++) {
1458 $extuser = textlib::convert($users[$i][$this->config->user_attribute][0],
1459 $this->config->ldapencoding, 'utf-8');
1460 array_push($fresult, $extuser);
1462 unset($ldap_result); // Free mem.
1463 } while ($ldap_pagedresults && !empty($ldap_cookie));
1466 // If paged results were used, make sure the current connection is completely closed
1467 $this->ldap_close($ldap_pagedresults);
1472 * Indicates if password hashes should be stored in local moodle database.
1474 * @return bool true means flag 'not_cached' stored instead of password hash
1476 function prevent_local_passwords() {
1477 return !empty($this->config->preventpassindb);
1481 * Returns true if this authentication plugin is 'internal'.
1485 function is_internal() {
1490 * Returns true if this authentication plugin can change the user's
1495 function can_change_password() {
1496 return !empty($this->config->stdchangepassword) or !empty($this->config->changepasswordurl);
1500 * Returns the URL for changing the user's password, or empty if the default can
1503 * @return moodle_url
1505 function change_password_url() {
1506 if (empty($this->config->stdchangepassword)) {
1507 return new moodle_url($this->config->changepasswordurl);
1514 * Will get called before the login page is shownr. Ff NTLM SSO
1515 * is enabled, and the user is in the right network, we'll redirect
1516 * to the magic NTLM page for SSO...
1519 function loginpage_hook() {
1520 global $CFG, $SESSION;
1522 // HTTPS is potentially required
1523 //httpsrequired(); - this must be used before setting the URL, it is already done on the login/index.php
1525 if (($_SERVER['REQUEST_METHOD'] === 'GET' // Only on initial GET of loginpage
1526 || ($_SERVER['REQUEST_METHOD'] === 'POST'
1527 && (get_referer() != strip_querystring(qualified_me()))))
1528 // Or when POSTed from another place
1530 && !empty($this->config->ntlmsso_enabled) // SSO enabled
1531 && !empty($this->config->ntlmsso_subnet) // have a subnet to test for
1532 && empty($_GET['authldap_skipntlmsso']) // haven't failed it yet
1533 && (isguestuser() || !isloggedin()) // guestuser or not-logged-in users
1534 && address_in_subnet(getremoteaddr(), $this->config->ntlmsso_subnet)) {
1536 // First, let's remember where we were trying to get to before we got here
1537 if (empty($SESSION->wantsurl)) {
1538 $SESSION->wantsurl = (array_key_exists('HTTP_REFERER', $_SERVER) &&
1539 $_SERVER['HTTP_REFERER'] != $CFG->wwwroot &&
1540 $_SERVER['HTTP_REFERER'] != $CFG->wwwroot.'/' &&
1541 $_SERVER['HTTP_REFERER'] != $CFG->httpswwwroot.'/login/' &&
1542 $_SERVER['HTTP_REFERER'] != $CFG->httpswwwroot.'/login/index.php')
1543 ? $_SERVER['HTTP_REFERER'] : NULL;
1546 // Now start the whole NTLM machinery.
1547 if(!empty($this->config->ntlmsso_ie_fastpath)) {
1548 // Shortcut for IE browsers: skip the attempt page
1549 if(check_browser_version('MSIE')) {
1550 $sesskey = sesskey();
1551 redirect($CFG->wwwroot.'/auth/ldap/ntlmsso_magic.php?sesskey='.$sesskey);
1553 redirect($CFG->httpswwwroot.'/login/index.php?authldap_skipntlmsso=1');
1556 redirect($CFG->wwwroot.'/auth/ldap/ntlmsso_attempt.php');
1560 // No NTLM SSO, Use the normal login page instead.
1562 // If $SESSION->wantsurl is empty and we have a 'Referer:' header, the login
1563 // page insists on redirecting us to that page after user validation. If
1564 // we clicked on the redirect link at the ntlmsso_finish.php page (instead
1565 // of waiting for the redirection to happen) then we have a 'Referer:' header
1566 // we don't want to use at all. As we can't get rid of it, just point
1567 // $SESSION->wantsurl to $CFG->wwwroot (after all, we came from there).
1568 if (empty($SESSION->wantsurl)
1569 && (get_referer() == $CFG->httpswwwroot.'/auth/ldap/ntlmsso_finish.php')) {
1571 $SESSION->wantsurl = $CFG->wwwroot;
1576 * To be called from a page running under NTLM's
1577 * "Integrated Windows Authentication".
1579 * If successful, it will set a special "cookie" (not an HTTP cookie!)
1580 * in cache_flags under the $this->pluginconfig/ntlmsess "plugin" and return true.
1581 * The "cookie" will be picked up by ntlmsso_finish() to complete the
1584 * On failure it will return false for the caller to display an appropriate
1585 * error message (probably saying that Integrated Windows Auth isn't enabled!)
1587 * NOTE that this code will execute under the OS user credentials,
1588 * so we MUST avoid dealing with files -- such as session files.
1589 * (The caller should define('NO_MOODLE_COOKIES', true) before including config.php)
1592 function ntlmsso_magic($sesskey) {
1593 if (isset($_SERVER['REMOTE_USER']) && !empty($_SERVER['REMOTE_USER'])) {
1595 // HTTP __headers__ seem to be sent in ISO-8859-1 encoding
1596 // (according to my reading of RFC-1945, RFC-2616 and RFC-2617 and
1597 // my local tests), so we need to convert the REMOTE_USER value
1598 // (i.e., what we got from the HTTP WWW-Authenticate header) into UTF-8
1599 $username = textlib::convert($_SERVER['REMOTE_USER'], 'iso-8859-1', 'utf-8');
1601 switch ($this->config->ntlmsso_type) {
1603 // The format is now configurable, so try to extract the username
1604 $username = $this->get_ntlm_remote_user($username);
1605 if (empty($username)) {
1610 // Format is username@DOMAIN
1611 $username = substr($username, 0, strpos($username, '@'));
1614 error_log($this->errorlogtag.get_string ('ntlmsso_unknowntype', 'auth_ldap'));
1615 return false; // Should never happen!
1618 $username = textlib::strtolower($username); // Compatibility hack
1619 set_cache_flag($this->pluginconfig.'/ntlmsess', $sesskey, $username, AUTH_NTLMTIMEOUT);
1626 * Find the session set by ntlmsso_magic(), validate it and
1627 * call authenticate_user_login() to authenticate the user through
1628 * the auth machinery.
1630 * It is complemented by a similar check in user_login().
1632 * If it succeeds, it never returns.
1635 function ntlmsso_finish() {
1636 global $CFG, $USER, $SESSION;
1639 $cf = get_cache_flags($this->pluginconfig.'/ntlmsess');
1640 if (!isset($cf[$key]) || $cf[$key] === '') {
1643 $username = $cf[$key];
1644 // Here we want to trigger the whole authentication machinery
1645 // to make sure no step is bypassed...
1646 $user = authenticate_user_login($username, $key);
1648 add_to_log(SITEID, 'user', 'login', "view.php?id=$USER->id&course=".SITEID,
1649 $user->id, 0, $user->id);
1650 complete_user_login($user);
1652 // Cleanup the key to prevent reuse...
1653 // and to allow re-logins with normal credentials
1654 unset_cache_flag($this->pluginconfig.'/ntlmsess', $key);
1657 if (user_not_fully_set_up($USER)) {
1658 $urltogo = $CFG->wwwroot.'/user/edit.php';
1659 // We don't delete $SESSION->wantsurl yet, so we get there later
1660 } else if (isset($SESSION->wantsurl) and (strpos($SESSION->wantsurl, $CFG->wwwroot) === 0)) {
1661 $urltogo = $SESSION->wantsurl; // Because it's an address in this site
1662 unset($SESSION->wantsurl);
1664 // No wantsurl stored or external - go to homepage
1665 $urltogo = $CFG->wwwroot.'/';
1666 unset($SESSION->wantsurl);
1670 // Should never reach here.
1675 * Sync roles for this user
1677 * @param $user object user object (without system magic quotes)
1679 function sync_roles($user) {
1680 $iscreator = $this->iscreator($user->username);
1681 if ($iscreator === null) {
1682 return; // Nothing to sync - creators not configured
1685 if ($roles = get_archetype_roles('coursecreator')) {
1686 $creatorrole = array_shift($roles); // We can only use one, let's use the first one
1687 $systemcontext = context_system::instance();
1689 if ($iscreator) { // Following calls will not create duplicates
1690 role_assign($creatorrole->id, $user->id, $systemcontext->id, $this->roleauth);
1692 // Unassign only if previously assigned by this plugin!
1693 role_unassign($creatorrole->id, $user->id, $systemcontext->id, $this->roleauth);
1699 * Prints a form for configuring this authentication plugin.
1701 * This function is called from admin/auth.php, and outputs a full page with
1702 * a form for configuring this plugin.
1704 * @param array $page An object containing all the data for this page.
1706 function config_form($config, $err, $user_fields) {
1707 global $CFG, $OUTPUT;
1709 if (!function_exists('ldap_connect')) { // Is php-ldap really there?
1710 echo $OUTPUT->notification(get_string('auth_ldap_noextension', 'auth_ldap'));
1714 if (!ldap_paged_results_supported($this->config->ldap_version)) {
1715 echo $OUTPUT->notification(get_string('pagedresultsnotsupp', 'auth_ldap'));
1718 include($CFG->dirroot.'/auth/ldap/config.html');
1722 * Processes and stores configuration data for this authentication plugin.
1724 function process_config($config) {
1725 // Set to defaults if undefined
1726 if (!isset($config->host_url)) {
1727 $config->host_url = '';
1729 if (empty($config->ldapencoding)) {
1730 $config->ldapencoding = 'utf-8';
1732 if (!isset($config->pagesize)) {
1733 $config->pagesize = LDAP_DEFAULT_PAGESIZE;
1735 if (!isset($config->contexts)) {
1736 $config->contexts = '';
1738 if (!isset($config->user_type)) {
1739 $config->user_type = 'default';
1741 if (!isset($config->user_attribute)) {
1742 $config->user_attribute = '';
1744 if (!isset($config->search_sub)) {
1745 $config->search_sub = '';
1747 if (!isset($config->opt_deref)) {
1748 $config->opt_deref = LDAP_DEREF_NEVER;
1750 if (!isset($config->preventpassindb)) {
1751 $config->preventpassindb = 0;
1753 if (!isset($config->bind_dn)) {
1754 $config->bind_dn = '';
1756 if (!isset($config->bind_pw)) {
1757 $config->bind_pw = '';
1759 if (!isset($config->ldap_version)) {
1760 $config->ldap_version = '3';
1762 if (!isset($config->objectclass)) {
1763 $config->objectclass = '';
1765 if (!isset($config->memberattribute)) {
1766 $config->memberattribute = '';
1768 if (!isset($config->memberattribute_isdn)) {
1769 $config->memberattribute_isdn = '';
1771 if (!isset($config->creators)) {
1772 $config->creators = '';
1774 if (!isset($config->create_context)) {
1775 $config->create_context = '';
1777 if (!isset($config->expiration)) {
1778 $config->expiration = '';
1780 if (!isset($config->expiration_warning)) {
1781 $config->expiration_warning = '10';
1783 if (!isset($config->expireattr)) {
1784 $config->expireattr = '';
1786 if (!isset($config->gracelogins)) {
1787 $config->gracelogins = '';
1789 if (!isset($config->graceattr)) {
1790 $config->graceattr = '';
1792 if (!isset($config->auth_user_create)) {
1793 $config->auth_user_create = '';
1795 if (!isset($config->forcechangepassword)) {
1796 $config->forcechangepassword = 0;
1798 if (!isset($config->stdchangepassword)) {
1799 $config->stdchangepassword = 0;
1801 if (!isset($config->passtype)) {
1802 $config->passtype = 'plaintext';
1804 if (!isset($config->changepasswordurl)) {
1805 $config->changepasswordurl = '';
1807 if (!isset($config->removeuser)) {
1808 $config->removeuser = AUTH_REMOVEUSER_KEEP;
1810 if (!isset($config->ntlmsso_enabled)) {
1811 $config->ntlmsso_enabled = 0;
1813 if (!isset($config->ntlmsso_subnet)) {
1814 $config->ntlmsso_subnet = '';
1816 if (!isset($config->ntlmsso_ie_fastpath)) {
1817 $config->ntlmsso_ie_fastpath = 0;
1819 if (!isset($config->ntlmsso_type)) {
1820 $config->ntlmsso_type = 'ntlm';
1822 if (!isset($config->ntlmsso_remoteuserformat)) {
1823 $config->ntlmsso_remoteuserformat = '';
1826 // Try to remove duplicates before storing the contexts (to avoid problems in sync_users()).
1827 $config->contexts = explode(';', $config->contexts);
1828 $config->contexts = array_map(create_function('$x', 'return textlib::strtolower(trim($x));'),
1830 $config->contexts = implode(';', array_unique($config->contexts));
1833 set_config('host_url', trim($config->host_url), $this->pluginconfig);
1834 set_config('ldapencoding', trim($config->ldapencoding), $this->pluginconfig);
1835 set_config('pagesize', (int)trim($config->pagesize), $this->pluginconfig);
1836 set_config('contexts', $config->contexts, $this->pluginconfig);
1837 set_config('user_type', textlib::strtolower(trim($config->user_type)), $this->pluginconfig);
1838 set_config('user_attribute', textlib::strtolower(trim($config->user_attribute)), $this->pluginconfig);
1839 set_config('search_sub', $config->search_sub, $this->pluginconfig);
1840 set_config('opt_deref', $config->opt_deref, $this->pluginconfig);
1841 set_config('preventpassindb', $config->preventpassindb, $this->pluginconfig);
1842 set_config('bind_dn', trim($config->bind_dn), $this->pluginconfig);
1843 set_config('bind_pw', $config->bind_pw, $this->pluginconfig);
1844 set_config('ldap_version', $config->ldap_version, $this->pluginconfig);
1845 set_config('objectclass', trim($config->objectclass), $this->pluginconfig);
1846 set_config('memberattribute', textlib::strtolower(trim($config->memberattribute)), $this->pluginconfig);
1847 set_config('memberattribute_isdn', $config->memberattribute_isdn, $this->pluginconfig);
1848 set_config('creators', trim($config->creators), $this->pluginconfig);
1849 set_config('create_context', trim($config->create_context), $this->pluginconfig);
1850 set_config('expiration', $config->expiration, $this->pluginconfig);
1851 set_config('expiration_warning', trim($config->expiration_warning), $this->pluginconfig);
1852 set_config('expireattr', textlib::strtolower(trim($config->expireattr)), $this->pluginconfig);
1853 set_config('gracelogins', $config->gracelogins, $this->pluginconfig);
1854 set_config('graceattr', textlib::strtolower(trim($config->graceattr)), $this->pluginconfig);
1855 set_config('auth_user_create', $config->auth_user_create, $this->pluginconfig);
1856 set_config('forcechangepassword', $config->forcechangepassword, $this->pluginconfig);
1857 set_config('stdchangepassword', $config->stdchangepassword, $this->pluginconfig);
1858 set_config('passtype', $config->passtype, $this->pluginconfig);
1859 set_config('changepasswordurl', trim($config->changepasswordurl), $this->pluginconfig);
1860 set_config('removeuser', $config->removeuser, $this->pluginconfig);
1861 set_config('ntlmsso_enabled', (int)$config->ntlmsso_enabled, $this->pluginconfig);
1862 set_config('ntlmsso_subnet', trim($config->ntlmsso_subnet), $this->pluginconfig);
1863 set_config('ntlmsso_ie_fastpath', (int)$config->ntlmsso_ie_fastpath, $this->pluginconfig);
1864 set_config('ntlmsso_type', $config->ntlmsso_type, 'auth/ldap');
1865 set_config('ntlmsso_remoteuserformat', trim($config->ntlmsso_remoteuserformat), 'auth/ldap');
1871 * Get password expiration time for a given user from Active Directory
1873 * @param string $pwdlastset The time last time we changed the password.
1874 * @param resource $lcapconn The open LDAP connection.
1875 * @param string $user_dn The distinguished name of the user we are checking.
1877 * @return string $unixtime
1879 function ldap_get_ad_pwdexpire($pwdlastset, $ldapconn, $user_dn){
1882 if (!function_exists('bcsub')) {
1883 error_log($this->errorlogtag.get_string ('needbcmath', 'auth_ldap'));
1887 // If UF_DONT_EXPIRE_PASSWD flag is set in user's
1888 // userAccountControl attribute, the password doesn't expire.
1889 $sr = ldap_read($ldapconn, $user_dn, '(objectClass=*)',
1890 array('userAccountControl'));
1892 error_log($this->errorlogtag.get_string ('useracctctrlerror', 'auth_ldap', $user_dn));
1893 // Don't expire password, as we are not sure if it has to be
1898 $entry = ldap_get_entries_moodle($ldapconn, $sr);
1899 $info = array_change_key_case($entry[0], CASE_LOWER);
1900 $useraccountcontrol = $info['useraccountcontrol'][0];
1901 if ($useraccountcontrol & UF_DONT_EXPIRE_PASSWD) {
1902 // Password doesn't expire.
1906 // If pwdLastSet is zero, the user must change his/her password now
1907 // (unless UF_DONT_EXPIRE_PASSWD flag is set, but we already
1908 // tested this above)
1909 if ($pwdlastset === '0') {
1910 // Password has expired
1914 // ----------------------------------------------------------------
1915 // Password expiration time in Active Directory is the composition of
1918 // - User's pwdLastSet attribute, that stores the last time
1919 // the password was changed.
1921 // - Domain's maxPwdAge attribute, that sets how long
1922 // passwords last in this domain.
1924 // We already have the first value (passed in as a parameter). We
1925 // need to get the second one. As we don't know the domain DN, we
1926 // have to query rootDSE's defaultNamingContext attribute to get
1927 // it. Then we have to query that DN's maxPwdAge attribute to get
1930 // Once we have both values, we just need to combine them. But MS
1931 // chose to use a different base and unit for time measurements.
1932 // So we need to convert the values to Unix timestamps (see
1934 // ----------------------------------------------------------------
1936 $sr = ldap_read($ldapconn, ROOTDSE, '(objectClass=*)',
1937 array('defaultNamingContext'));
1939 error_log($this->errorlogtag.get_string ('rootdseerror', 'auth_ldap'));
1943 $entry = ldap_get_entries_moodle($ldapconn, $sr);
1944 $info = array_change_key_case($entry[0], CASE_LOWER);
1945 $domaindn = $info['defaultnamingcontext'][0];
1947 $sr = ldap_read ($ldapconn, $domaindn, '(objectClass=*)',
1948 array('maxPwdAge'));
1949 $entry = ldap_get_entries_moodle($ldapconn, $sr);
1950 $info = array_change_key_case($entry[0], CASE_LOWER);
1951 $maxpwdage = $info['maxpwdage'][0];
1953 // ----------------------------------------------------------------
1954 // MSDN says that "pwdLastSet contains the number of 100 nanosecond
1955 // intervals since January 1, 1601 (UTC), stored in a 64 bit integer".
1957 // According to Perl's Date::Manip, the number of seconds between
1958 // this date and Unix epoch is 11644473600. So we have to
1959 // substract this value to calculate a Unix time, once we have
1960 // scaled pwdLastSet to seconds. This is the script used to
1961 // calculate the value shown above:
1963 // #!/usr/bin/perl -w
1967 // $date1 = ParseDate ("160101010000 UTC");
1968 // $date2 = ParseDate ("197001010000 UTC");
1969 // $delta = DateCalc($date1, $date2, \$err);
1970 // $secs = Delta_Format($delta, 0, "%st");
1971 // print "$secs \n";
1973 // MSDN also says that "maxPwdAge is stored as a large integer that
1974 // represents the number of 100 nanosecond intervals from the time
1975 // the password was set before the password expires." We also need
1976 // to scale this to seconds. Bear in mind that this value is stored
1977 // as a _negative_ quantity (at least in my AD domain).
1979 // As a last remark, if the low 32 bits of maxPwdAge are equal to 0,
1980 // the maximum password age in the domain is set to 0, which means
1981 // passwords do not expire (see
1982 // http://msdn2.microsoft.com/en-us/library/ms974598.aspx)
1984 // As the quantities involved are too big for PHP integers, we
1985 // need to use BCMath functions to work with arbitrary precision
1987 // ----------------------------------------------------------------
1989 // If the low order 32 bits are 0, then passwords do not expire in
1990 // the domain. Just do '$maxpwdage mod 2^32' and check the result
1991 // (2^32 = 4294967296)
1992 if (bcmod ($maxpwdage, 4294967296) === '0') {
1996 // Add up pwdLastSet and maxPwdAge to get password expiration
1997 // time, in MS time units. Remember maxPwdAge is stored as a
1998 // _negative_ quantity, so we need to substract it in fact.
1999 $pwdexpire = bcsub ($pwdlastset, $maxpwdage);
2001 // Scale the result to convert it to Unix time units and return
2003 return bcsub( bcdiv($pwdexpire, '10000000'), '11644473600');
2007 * Connect to the LDAP server, using the plugin configured
2008 * settings. It's actually a wrapper around ldap_connect_moodle()
2010 * @return resource A valid LDAP connection (or dies if it can't connect)
2012 function ldap_connect() {
2013 // Cache ldap connections. They are expensive to set up
2014 // and can drain the TCP/IP ressources on the server if we
2015 // are syncing a lot of users (as we try to open a new connection
2016 // to get the user details). This is the least invasive way
2017 // to reuse existing connections without greater code surgery.
2018 if(!empty($this->ldapconnection)) {
2020 return $this->ldapconnection;
2023 if($ldapconnection = ldap_connect_moodle($this->config->host_url, $this->config->ldap_version,
2024 $this->config->user_type, $this->config->bind_dn,
2025 $this->config->bind_pw, $this->config->opt_deref,
2027 $this->ldapconns = 1;
2028 $this->ldapconnection = $ldapconnection;
2029 return $ldapconnection;
2032 print_error('auth_ldap_noconnect_all', 'auth_ldap', '', $debuginfo);
2036 * Disconnects from a LDAP server
2038 * @param force boolean Forces closing the real connection to the LDAP server, ignoring any
2039 * cached connections. This is needed when we've used paged results
2040 * and want to use normal results again.
2042 function ldap_close($force=false) {
2044 if (($this->ldapconns == 0) || ($force)) {
2045 $this->ldapconns = 0;
2046 @ldap_close($this->ldapconnection);
2047 unset($this->ldapconnection);
2052 * Search specified contexts for username and return the user dn
2053 * like: cn=username,ou=suborg,o=org. It's actually a wrapper
2054 * around ldap_find_userdn().
2056 * @param resource $ldapconnection a valid LDAP connection
2057 * @param string $extusername the username to search (in external LDAP encoding, no db slashes)
2058 * @return mixed the user dn (external LDAP encoding) or false
2060 function ldap_find_userdn($ldapconnection, $extusername) {
2061 $ldap_contexts = explode(';', $this->config->contexts);
2062 if (!empty($this->config->create_context)) {
2063 array_push($ldap_contexts, $this->config->create_context);
2066 return ldap_find_userdn($ldapconnection, $extusername, $ldap_contexts, $this->config->objectclass,
2067 $this->config->user_attribute, $this->config->search_sub);
2072 * A chance to validate form data, and last chance to do stuff
2073 * before it is inserted in config_plugin
2075 * @param object object with submitted configuration settings (without system magic quotes)
2076 * @param array $err array of error messages (passed by reference)
2078 function validate_form($form, &$err) {
2079 if ($form->ntlmsso_type == 'ntlm') {
2080 $format = trim($form->ntlmsso_remoteuserformat);
2081 if (!empty($format) && !preg_match('/%username%/i', $format)) {
2082 $err['ntlmsso_remoteuserformat'] = get_string('auth_ntlmsso_missing_username', 'auth_ldap');
2089 * When using NTLM SSO, the format of the remote username we get in
2090 * $_SERVER['REMOTE_USER'] may vary, depending on where from and how the web
2091 * server gets the data. So we let the admin configure the format using two
2092 * place holders (%domain% and %username%). This function tries to extract
2093 * the username (stripping the domain part and any separators if they are
2094 * present) from the value present in $_SERVER['REMOTE_USER'], using the
2095 * configured format.
2097 * @param string $remoteuser The value from $_SERVER['REMOTE_USER'] (converted to UTF-8)
2099 * @return string The remote username (without domain part or
2100 * separators). Empty string if we can't extract the username.
2102 protected function get_ntlm_remote_user($remoteuser) {
2103 if (empty($this->config->ntlmsso_remoteuserformat)) {
2104 $format = AUTH_NTLM_DEFAULT_FORMAT;
2106 $format = $this->config->ntlmsso_remoteuserformat;
2109 $format = preg_quote($format);
2110 $formatregex = preg_replace(array('#%domain%#', '#%username%#'),
2111 array('('.AUTH_NTLM_VALID_DOMAINNAME.')', '('.AUTH_NTLM_VALID_USERNAME.')'),
2113 if (preg_match('#^'.$formatregex.'$#', $remoteuser, $matches)) {
2114 $user = end($matches);
2118 /* We are unable to extract the username with the configured format. Probably
2119 * the format specified is wrong, so log a warning for the admin and return
2120 * an empty username.
2122 error_log($this->errorlogtag.get_string ('auth_ntlmsso_maybeinvalidformat', 'auth_ldap'));
2126 } // End of the class