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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/>.
/**
* LDAP enrolment plugin implementation.
*
* This plugin synchronises enrolment and roles with a LDAP server.
*
* @package enrol_ldap
* @author Iñaki Arenaza - based on code by Martin Dougiamas, Martin Langhoff and others
* @copyright 1999 onwards Martin Dougiamas {@link http://moodle.com}
* @copyright 2010 Iñaki Arenaza <iarenaza@eps.mondragon.edu>
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
defined('MOODLE_INTERNAL') || die();
class enrol_ldap_plugin extends enrol_plugin {
protected $enrol_localcoursefield = 'idnumber';
protected $enroltype = 'enrol_ldap';
protected $errorlogtag = '[ENROL LDAP] ';
/**
* The object class to use when finding users.
*
* @var string $userobjectclass
*/
protected $userobjectclass;
/**
* Constructor for the plugin. In addition to calling the parent
* constructor, we define and 'fix' some settings depending on the
* real settings the admin defined.
*/
public function __construct() {
global $CFG;
require_once($CFG->libdir.'/ldaplib.php');
// Do our own stuff to fix the config (it's easier to do it
// here than using the admin settings infrastructure). We
// don't call $this->set_config() for any of the 'fixups'
// (except the objectclass, as it's critical) because the user
// didn't specify any values and relied on the default values
// defined for the user type she chose.
$this->load_config();
// Make sure we get sane defaults for critical values.
$this->config->ldapencoding = $this->get_config('ldapencoding', 'utf-8');
$this->config->user_type = $this->get_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();
// The objectclass in the defaults is for a user.
// This will be required later, but enrol_ldap uses 'objectclass' for its group objectclass.
// Save the normalised user objectclass for later.
$this->userobjectclass = ldap_normalise_objectclass($default['objectclass'][$this->get_config('user_type')]);
// Remove the objectclass default, as the values specified there are for users, and we are dealing with groups here.
unset($default['objectclass']);
// Use defaults if values not given. Dont use this->get_config()
// here to be able to check for 0 and false values too.
foreach ($default as $key => $value) {
// Watch out - 0, false are correct values too, so we can't use $this->get_config()
if (!isset($this->config->{$key}) or $this->config->{$key} == '') {
$this->config->{$key} = $value[$this->config->user_type];
}
}
// Normalise the objectclass used for groups.
if (empty($this->config->objectclass)) {
// No objectclass set yet - set a default class.
$this->config->objectclass = ldap_normalise_objectclass(null, '*');
$this->set_config('objectclass', $this->config->objectclass);
} else {
$objectclass = ldap_normalise_objectclass($this->config->objectclass);
if ($objectclass !== $this->config->objectclass) {
// The objectclass was changed during normalisation.
// Save it in config, and update the local copy of config.
$this->set_config('objectclass', $objectclass);
$this->config->objectclass = $objectclass;
}
}
}
/**
* Is it possible to delete enrol instance via standard UI?
*
* @param object $instance
* @return bool
*/
public function can_delete_instance($instance) {
$context = context_course::instance($instance->courseid);
if (!has_capability('enrol/ldap:manage', $context)) {
return false;
}
if (!enrol_is_enabled('ldap')) {
return true;
}
if (!$this->get_config('ldap_host') or !$this->get_config('objectclass') or !$this->get_config('course_idnumber')) {
return true;
}
// TODO: connect to external system and make sure no users are to be enrolled in this course
return false;
}
/**
* Is it possible to hide/show enrol instance via standard UI?
*
* @param stdClass $instance
* @return bool
*/
public function can_hide_show_instance($instance) {
$context = context_course::instance($instance->courseid);
return has_capability('enrol/ldap:manage', $context);
}
/**
* Forces synchronisation of user enrolments with LDAP server.
* It creates courses if the plugin is configured to do so.
*
* @param object $user user record
* @return void
*/
public function sync_user_enrolments($user) {
global $DB;
// Do not try to print anything to the output because this method is called during interactive login.
if (PHPUNIT_TEST) {
$trace = new null_progress_trace();
} else {
$trace = new error_log_progress_trace($this->errorlogtag);
}
if (!$this->ldap_connect($trace)) {
$trace->finished();
return;
}
if (!is_object($user) or !property_exists($user, 'id')) {
throw new coding_exception('Invalid $user parameter in sync_user_enrolments()');
}
if (!property_exists($user, 'idnumber')) {
debugging('Invalid $user parameter in sync_user_enrolments(), missing idnumber');
$user = $DB->get_record('user', array('id'=>$user->id));
}
// We may need a lot of memory here
core_php_time_limit::raise();
raise_memory_limit(MEMORY_HUGE);
// Get enrolments for each type of role.
$roles = get_all_roles();
$enrolments = array();
foreach($roles as $role) {
// Get external enrolments according to LDAP server
$enrolments[$role->id]['ext'] = $this->find_ext_enrolments($user->idnumber, $role);
// Get the list of current user enrolments that come from LDAP
$sql= "SELECT e.courseid, ue.status, e.id as enrolid, c.shortname
FROM {user} u
JOIN {role_assignments} ra ON (ra.userid = u.id AND ra.component = 'enrol_ldap' AND ra.roleid = :roleid)
JOIN {user_enrolments} ue ON (ue.userid = u.id AND ue.enrolid = ra.itemid)
JOIN {enrol} e ON (e.id = ue.enrolid)
JOIN {course} c ON (c.id = e.courseid)
WHERE u.deleted = 0 AND u.id = :userid";
$params = array ('roleid'=>$role->id, 'userid'=>$user->id);
$enrolments[$role->id]['current'] = $DB->get_records_sql($sql, $params);
}
$ignorehidden = $this->get_config('ignorehiddencourses');
$courseidnumber = $this->get_config('course_idnumber');
foreach($roles as $role) {
foreach ($enrolments[$role->id]['ext'] as $enrol) {
$course_ext_id = $enrol[$courseidnumber][0];
if (empty($course_ext_id)) {
$trace->output(get_string('extcourseidinvalid', 'enrol_ldap'));
continue; // Next; skip this one!
}
// Create the course if required
$course = $DB->get_record('course', array($this->enrol_localcoursefield=>$course_ext_id));
if (empty($course)) { // Course doesn't exist
if ($this->get_config('autocreate')) { // Autocreate
$trace->output(get_string('createcourseextid', 'enrol_ldap', array('courseextid'=>$course_ext_id)));
if (!$newcourseid = $this->create_course($enrol, $trace)) {
continue;
}
$course = $DB->get_record('course', array('id'=>$newcourseid));
} else {
$trace->output(get_string('createnotcourseextid', 'enrol_ldap', array('courseextid'=>$course_ext_id)));
continue; // Next; skip this one!
}
}
// Deal with enrolment in the moodle db
// Add necessary enrol instance if not present yet;
$sql = "SELECT c.id, c.visible, e.id as enrolid
FROM {course} c
JOIN {enrol} e ON (e.courseid = c.id AND e.enrol = 'ldap')
WHERE c.id = :courseid";
$params = array('courseid'=>$course->id);
if (!($course_instance = $DB->get_record_sql($sql, $params, IGNORE_MULTIPLE))) {
$course_instance = new stdClass();
$course_instance->id = $course->id;
$course_instance->visible = $course->visible;
$course_instance->enrolid = $this->add_instance($course_instance);
}
if (!$instance = $DB->get_record('enrol', array('id'=>$course_instance->enrolid))) {
continue; // Weird; skip this one.
}
if ($ignorehidden && !$course_instance->visible) {
continue;
}
if (empty($enrolments[$role->id]['current'][$course->id])) {
// Enrol the user in the given course, with that role.
$this->enrol_user($instance, $user->id, $role->id);
// Make sure we set the enrolment status to active. If the user wasn't
// previously enrolled to the course, enrol_user() sets it. But if we
// configured the plugin to suspend the user enrolments _AND_ remove
// the role assignments on external unenrol, then enrol_user() doesn't
// set it back to active on external re-enrolment. So set it
// unconditionnally to cover both cases.
$DB->set_field('user_enrolments', 'status', ENROL_USER_ACTIVE, array('enrolid'=>$instance->id, 'userid'=>$user->id));
$trace->output(get_string('enroluser', 'enrol_ldap',
array('user_username'=> $user->username,
'course_shortname'=>$course->shortname,
'course_id'=>$course->id)));
} else {
if ($enrolments[$role->id]['current'][$course->id]->status == ENROL_USER_SUSPENDED) {
// Reenable enrolment that was previously disabled. Enrolment refreshed
$DB->set_field('user_enrolments', 'status', ENROL_USER_ACTIVE, array('enrolid'=>$instance->id, 'userid'=>$user->id));
$trace->output(get_string('enroluserenable', 'enrol_ldap',
array('user_username'=> $user->username,
'course_shortname'=>$course->shortname,
'course_id'=>$course->id)));
}
}
// Remove this course from the current courses, to be able to detect
// which current courses should be unenroled from when we finish processing
// external enrolments.
unset($enrolments[$role->id]['current'][$course->id]);
}
// Deal with unenrolments.
$transaction = $DB->start_delegated_transaction();
foreach ($enrolments[$role->id]['current'] as $course) {
$context = context_course::instance($course->courseid);
$instance = $DB->get_record('enrol', array('id'=>$course->enrolid));
switch ($this->get_config('unenrolaction')) {
case ENROL_EXT_REMOVED_UNENROL:
$this->unenrol_user($instance, $user->id);
$trace->output(get_string('extremovedunenrol', 'enrol_ldap',
array('user_username'=> $user->username,
'course_shortname'=>$course->shortname,
'course_id'=>$course->courseid)));
break;
case ENROL_EXT_REMOVED_KEEP:
// Keep - only adding enrolments
break;
case ENROL_EXT_REMOVED_SUSPEND:
if ($course->status != ENROL_USER_SUSPENDED) {
$DB->set_field('user_enrolments', 'status', ENROL_USER_SUSPENDED, array('enrolid'=>$instance->id, 'userid'=>$user->id));
$trace->output(get_string('extremovedsuspend', 'enrol_ldap',
array('user_username'=> $user->username,
'course_shortname'=>$course->shortname,
'course_id'=>$course->courseid)));
}
break;
case ENROL_EXT_REMOVED_SUSPENDNOROLES:
if ($course->status != ENROL_USER_SUSPENDED) {
$DB->set_field('user_enrolments', 'status', ENROL_USER_SUSPENDED, array('enrolid'=>$instance->id, 'userid'=>$user->id));
}
role_unassign_all(array('contextid'=>$context->id, 'userid'=>$user->id, 'component'=>'enrol_ldap', 'itemid'=>$instance->id));
$trace->output(get_string('extremovedsuspendnoroles', 'enrol_ldap',
array('user_username'=> $user->username,
'course_shortname'=>$course->shortname,
'course_id'=>$course->courseid)));
break;
}
}
$transaction->allow_commit();
}
$this->ldap_close();
$trace->finished();
}
/**
* Forces synchronisation of all enrolments with LDAP server.
* It creates courses if the plugin is configured to do so.
*
* @param progress_trace $trace
* @param int|null $onecourse limit sync to one course->id, null if all courses
* @return void
*/
public function sync_enrolments(progress_trace $trace, $onecourse = null) {
global $CFG, $DB;
if (!$this->ldap_connect($trace)) {
$trace->finished();
return;
}
$ldap_pagedresults = ldap_paged_results_supported($this->get_config('ldap_version'), $this->ldapconnection);
// we may need a lot of memory here
core_php_time_limit::raise();
raise_memory_limit(MEMORY_HUGE);
$oneidnumber = null;
if ($onecourse) {
if (!$course = $DB->get_record('course', array('id'=>$onecourse), 'id,'.$this->enrol_localcoursefield)) {
// Course does not exist, nothing to do.
$trace->output("Requested course $onecourse does not exist, no sync performed.");
$trace->finished();
return;
}
if (empty($course->{$this->enrol_localcoursefield})) {
$trace->output("Requested course $onecourse does not have {$this->enrol_localcoursefield}, no sync performed.");
$trace->finished();
return;
}
$oneidnumber = ldap_filter_addslashes(core_text::convert($course->idnumber, 'utf-8', $this->get_config('ldapencoding')));
}
// Get enrolments for each type of role.
$roles = get_all_roles();
$enrolments = array();
foreach($roles as $role) {
// Get all contexts
$ldap_contexts = explode(';', $this->config->{'contexts_role'.$role->id});
// Get all the fields we will want for the potential course creation
// as they are light. Don't get membership -- potentially a lot of data.
$ldap_fields_wanted = array('dn', $this->config->course_idnumber);
if (!empty($this->config->course_fullname)) {
array_push($ldap_fields_wanted, $this->config->course_fullname);
}
if (!empty($this->config->course_shortname)) {
array_push($ldap_fields_wanted, $this->config->course_shortname);
}
if (!empty($this->config->course_summary)) {
array_push($ldap_fields_wanted, $this->config->course_summary);
}
array_push($ldap_fields_wanted, $this->config->{'memberattribute_role'.$role->id});
// Define the search pattern
$ldap_search_pattern = $this->config->objectclass;
if ($oneidnumber !== null) {
$ldap_search_pattern = "(&$ldap_search_pattern({$this->config->course_idnumber}=$oneidnumber))";
}
$ldap_cookie = '';
$servercontrols = array();
foreach ($ldap_contexts as $ldap_context) {
$ldap_context = trim($ldap_context);
if (empty($ldap_context)) {
continue; // Next;
}
$flat_records = array();
do {
if ($ldap_pagedresults) {
// TODO: Remove the old branch of code once PHP 7.3.0 becomes required (Moodle 4.1).
if (version_compare(PHP_VERSION, '7.3.0', '<')) {
// Before 7.3, use this function that was deprecated in PHP 7.4.
ldap_control_paged_result($this->ldapconnection, $this->config->pagesize, true, $ldap_cookie);
} else {
// PHP 7.3 and up, use server controls.
$servercontrols = array(array(
'oid' => LDAP_CONTROL_PAGEDRESULTS, 'value' => array(
'size' => $this->config->pagesize, 'cookie' => $ldap_cookie)));
}
}
if ($this->config->course_search_sub) {
// Use ldap_search to find first user from subtree
// TODO: Remove the old branch of code once PHP 7.3.0 becomes required (Moodle 4.1).
if (version_compare(PHP_VERSION, '7.3.0', '<')) {
$ldap_result = @ldap_search($this->ldapconnection, $ldap_context,
$ldap_search_pattern, $ldap_fields_wanted);
} else {
$ldap_result = @ldap_search($this->ldapconnection, $ldap_context,
$ldap_search_pattern, $ldap_fields_wanted,
0, -1, -1, LDAP_DEREF_NEVER, $servercontrols);
}
} else {
// Search only in this context
// TODO: Remove the old branch of code once PHP 7.3.0 becomes required (Moodle 4.1).
if (version_compare(PHP_VERSION, '7.3.0', '<')) {
$ldap_result = @ldap_list($this->ldapconnection, $ldap_context,
$ldap_search_pattern, $ldap_fields_wanted);
} else {
$ldap_result = @ldap_list($this->ldapconnection, $ldap_context,
$ldap_search_pattern, $ldap_fields_wanted,
0, -1, -1, LDAP_DEREF_NEVER, $servercontrols);
}
}
if (!$ldap_result) {
continue; // Next
}
if ($ldap_pagedresults) {
// Get next server cookie to know if we'll need to continue searching.
$ldap_cookie = '';
// TODO: Remove the old branch of code once PHP 7.3.0 becomes required (Moodle 4.1).
if (version_compare(PHP_VERSION, '7.3.0', '<')) {
// Before 7.3, use this function that was deprecated in PHP 7.4.
ldap_control_paged_result_response($this->ldapconnection, $ldap_result, $ldap_cookie);
} else {
// Get next cookie from controls.
ldap_parse_result($this->ldapconnection, $ldap_result, $errcode, $matcheddn,
$errmsg, $referrals, $controls);
if (isset($controls[LDAP_CONTROL_PAGEDRESULTS]['value']['cookie'])) {
$ldap_cookie = $controls[LDAP_CONTROL_PAGEDRESULTS]['value']['cookie'];
}
}
}
// Check and push results
$records = ldap_get_entries($this->ldapconnection, $ldap_result);
// LDAP libraries return an odd array, really. fix it:
for ($c = 0; $c < $records['count']; $c++) {
array_push($flat_records, $records[$c]);
}
// Free some mem
unset($records);
} while ($ldap_pagedresults && !empty($ldap_cookie));
// If LDAP paged results were used, the current connection must be completely
// closed and a new one created, to work without paged results from here on.
if ($ldap_pagedresults) {
$this->ldap_close();
$this->ldap_connect($trace);
}
if (count($flat_records)) {
$ignorehidden = $this->get_config('ignorehiddencourses');
foreach($flat_records as $course) {
$course = array_change_key_case($course, CASE_LOWER);
$idnumber = $course[$this->config->course_idnumber][0];
$trace->output(get_string('synccourserole', 'enrol_ldap', array('idnumber'=>$idnumber, 'role_shortname'=>$role->shortname)));
// Does the course exist in moodle already?
$course_obj = $DB->get_record('course', array($this->enrol_localcoursefield=>$idnumber));
if (empty($course_obj)) { // Course doesn't exist
if ($this->get_config('autocreate')) { // Autocreate
$trace->output(get_string('createcourseextid', 'enrol_ldap', array('courseextid'=>$idnumber)));
if (!$newcourseid = $this->create_course($course, $trace)) {
continue;
}
$course_obj = $DB->get_record('course', array('id'=>$newcourseid));
} else {
$trace->output(get_string('createnotcourseextid', 'enrol_ldap', array('courseextid'=>$idnumber)));
continue; // Next; skip this one!
}
} else { // Check if course needs update & update as needed.
$this->update_course($course_obj, $course, $trace);
}
// Enrol & unenrol
// Pull the ldap membership into a nice array
// this is an odd array -- mix of hash and array --
$ldapmembers = array();
if (property_exists($this->config, 'memberattribute_role'.$role->id)
&& !empty($this->config->{'memberattribute_role'.$role->id})
&& !empty($course[$this->config->{'memberattribute_role'.$role->id}])) { // May have no membership!
$ldapmembers = $course[$this->config->{'memberattribute_role'.$role->id}];
unset($ldapmembers['count']); // Remove oddity ;)
// If we have enabled nested groups, we need to expand
// the groups to get the real user list. We need to do
// this before dealing with 'memberattribute_isdn'.
if ($this->config->nested_groups) {
$users = array();
foreach ($ldapmembers as $ldapmember) {
$grpusers = $this->ldap_explode_group($ldapmember,
$this->config->{'memberattribute_role'.$role->id});
$users = array_merge($users, $grpusers);
}
$ldapmembers = array_unique($users); // There might be duplicates.
}
// Deal with the case where the member attribute holds distinguished names,
// but only if the user attribute is not a distinguished name itself.
if ($this->config->memberattribute_isdn
&& ($this->config->idnumber_attribute !== 'dn')
&& ($this->config->idnumber_attribute !== 'distinguishedname')) {
// We need to retrieve the idnumber for all the users in $ldapmembers,
// as the idnumber does not match their dn and we get dn's from membership.
$memberidnumbers = array();
foreach ($ldapmembers as $ldapmember) {
$result = ldap_read($this->ldapconnection, $ldapmember, $this->userobjectclass,
array($this->config->idnumber_attribute));
$entry = ldap_first_entry($this->ldapconnection, $result);
$values = ldap_get_values($this->ldapconnection, $entry, $this->config->idnumber_attribute);
array_push($memberidnumbers, $values[0]);
}
$ldapmembers = $memberidnumbers;
}
}
// Prune old ldap enrolments
// hopefully they'll fit in the max buffer size for the RDBMS
$sql= "SELECT u.id as userid, u.username, ue.status,
ra.contextid, ra.itemid as instanceid
FROM {user} u
JOIN {role_assignments} ra ON (ra.userid = u.id AND ra.component = 'enrol_ldap' AND ra.roleid = :roleid)
JOIN {user_enrolments} ue ON (ue.userid = u.id AND ue.enrolid = ra.itemid)
JOIN {enrol} e ON (e.id = ue.enrolid)
WHERE u.deleted = 0 AND e.courseid = :courseid ";
$params = array('roleid'=>$role->id, 'courseid'=>$course_obj->id);
$context = context_course::instance($course_obj->id);
if (!empty($ldapmembers)) {
list($ldapml, $params2) = $DB->get_in_or_equal($ldapmembers, SQL_PARAMS_NAMED, 'm', false);
$sql .= "AND u.idnumber $ldapml";
$params = array_merge($params, $params2);
unset($params2);
} else {
$shortname = format_string($course_obj->shortname, true, array('context' => $context));
$trace->output(get_string('emptyenrolment', 'enrol_ldap',
array('role_shortname'=> $role->shortname,
'course_shortname' => $shortname)));
}
$todelete = $DB->get_records_sql($sql, $params);
if (!empty($todelete)) {
$transaction = $DB->start_delegated_transaction();
foreach ($todelete as $row) {
$instance = $DB->get_record('enrol', array('id'=>$row->instanceid));
switch ($this->get_config('unenrolaction')) {
case ENROL_EXT_REMOVED_UNENROL:
$this->unenrol_user($instance, $row->userid);
$trace->output(get_string('extremovedunenrol', 'enrol_ldap',
array('user_username'=> $row->username,
'course_shortname'=>$course_obj->shortname,
'course_id'=>$course_obj->id)));
break;
case ENROL_EXT_REMOVED_KEEP:
// Keep - only adding enrolments
break;
case ENROL_EXT_REMOVED_SUSPEND:
if ($row->status != ENROL_USER_SUSPENDED) {
$DB->set_field('user_enrolments', 'status', ENROL_USER_SUSPENDED, array('enrolid'=>$instance->id, 'userid'=>$row->userid));
$trace->output(get_string('extremovedsuspend', 'enrol_ldap',
array('user_username'=> $row->username,
'course_shortname'=>$course_obj->shortname,
'course_id'=>$course_obj->id)));
}
break;
case ENROL_EXT_REMOVED_SUSPENDNOROLES:
if ($row->status != ENROL_USER_SUSPENDED) {
$DB->set_field('user_enrolments', 'status', ENROL_USER_SUSPENDED, array('enrolid'=>$instance->id, 'userid'=>$row->userid));
}
role_unassign_all(array('contextid'=>$row->contextid, 'userid'=>$row->userid, 'component'=>'enrol_ldap', 'itemid'=>$instance->id));
$trace->output(get_string('extremovedsuspendnoroles', 'enrol_ldap',
array('user_username'=> $row->username,
'course_shortname'=>$course_obj->shortname,
'course_id'=>$course_obj->id)));
break;
}
}
$transaction->allow_commit();
}
// Insert current enrolments
// bad we can't do INSERT IGNORE with postgres...
// Add necessary enrol instance if not present yet;
$sql = "SELECT c.id, c.visible, e.id as enrolid
FROM {course} c
JOIN {enrol} e ON (e.courseid = c.id AND e.enrol = 'ldap')
WHERE c.id = :courseid";
$params = array('courseid'=>$course_obj->id);
if (!($course_instance = $DB->get_record_sql($sql, $params, IGNORE_MULTIPLE))) {
$course_instance = new stdClass();
$course_instance->id = $course_obj->id;
$course_instance->visible = $course_obj->visible;
$course_instance->enrolid = $this->add_instance($course_instance);
}
if (!$instance = $DB->get_record('enrol', array('id'=>$course_instance->enrolid))) {
continue; // Weird; skip this one.
}
if ($ignorehidden && !$course_instance->visible) {
continue;
}
$transaction = $DB->start_delegated_transaction();
foreach ($ldapmembers as $ldapmember) {
$sql = 'SELECT id,username,1 FROM {user} WHERE idnumber = ? AND deleted = 0';
$member = $DB->get_record_sql($sql, array($ldapmember));
if(empty($member) || empty($member->id)){
$trace->output(get_string('couldnotfinduser', 'enrol_ldap', $ldapmember));
continue;
}
$sql= "SELECT ue.status
FROM {user_enrolments} ue
JOIN {enrol} e ON (e.id = ue.enrolid AND e.enrol = 'ldap')
WHERE e.courseid = :courseid AND ue.userid = :userid";
$params = array('courseid'=>$course_obj->id, 'userid'=>$member->id);
$userenrolment = $DB->get_record_sql($sql, $params, IGNORE_MULTIPLE);
if (empty($userenrolment)) {
$this->enrol_user($instance, $member->id, $role->id);
// Make sure we set the enrolment status to active. If the user wasn't
// previously enrolled to the course, enrol_user() sets it. But if we
// configured the plugin to suspend the user enrolments _AND_ remove
// the role assignments on external unenrol, then enrol_user() doesn't
// set it back to active on external re-enrolment. So set it
// unconditionally to cover both cases.
$DB->set_field('user_enrolments', 'status', ENROL_USER_ACTIVE, array('enrolid'=>$instance->id, 'userid'=>$member->id));
$trace->output(get_string('enroluser', 'enrol_ldap',
array('user_username'=> $member->username,
'course_shortname'=>$course_obj->shortname,
'course_id'=>$course_obj->id)));
} else {
if (!$DB->record_exists('role_assignments', array('roleid'=>$role->id, 'userid'=>$member->id, 'contextid'=>$context->id, 'component'=>'enrol_ldap', 'itemid'=>$instance->id))) {
// This happens when reviving users or when user has multiple roles in one course.
$context = context_course::instance($course_obj->id);
role_assign($role->id, $member->id, $context->id, 'enrol_ldap', $instance->id);
$trace->output("Assign role to user '$member->username' in course '$course_obj->shortname ($course_obj->id)'");
}
if ($userenrolment->status == ENROL_USER_SUSPENDED) {
// Reenable enrolment that was previously disabled. Enrolment refreshed
$DB->set_field('user_enrolments', 'status', ENROL_USER_ACTIVE, array('enrolid'=>$instance->id, 'userid'=>$member->id));
$trace->output(get_string('enroluserenable', 'enrol_ldap',
array('user_username'=> $member->username,
'course_shortname'=>$course_obj->shortname,
'course_id'=>$course_obj->id)));
}
}
}
$transaction->allow_commit();
}
}
}
}
@$this->ldap_close();
$trace->finished();
}
/**
* Connect to the LDAP server, using the plugin configured
* settings. It's actually a wrapper around ldap_connect_moodle()
*
* @param progress_trace $trace
* @return bool success
*/
protected function ldap_connect(progress_trace $trace = null) {
global $CFG;
require_once($CFG->libdir.'/ldaplib.php');
if (isset($this->ldapconnection)) {
return true;
}
if ($ldapconnection = ldap_connect_moodle($this->get_config('host_url'), $this->get_config('ldap_version'),
$this->get_config('user_type'), $this->get_config('bind_dn'),
$this->get_config('bind_pw'), $this->get_config('opt_deref'),
$debuginfo, $this->get_config('start_tls'))) {
$this->ldapconnection = $ldapconnection;
return true;
}
if ($trace) {
$trace->output($debuginfo);
} else {
error_log($this->errorlogtag.$debuginfo);
}
return false;
}
/**
* Disconnects from a LDAP server
*
*/
protected function ldap_close() {
if (isset($this->ldapconnection)) {
@ldap_close($this->ldapconnection);
$this->ldapconnection = null;
}
return;
}
/**
* Return multidimensional array with details of user courses (at
* least dn and idnumber).
*
* @param string $memberuid user idnumber (without magic quotes).
* @param object role is a record from the mdl_role table.
* @return array
*/
protected function find_ext_enrolments($memberuid, $role) {
global $CFG;
require_once($CFG->libdir.'/ldaplib.php');
if (empty($memberuid)) {
// No "idnumber" stored for this user, so no LDAP enrolments
return array();
}
$ldap_contexts = trim($this->get_config('contexts_role'.$role->id));
if (empty($ldap_contexts)) {
// No role contexts, so no LDAP enrolments
return array();
}
$extmemberuid = core_text::convert($memberuid, 'utf-8', $this->get_config('ldapencoding'));
if($this->get_config('memberattribute_isdn')) {
if (!($extmemberuid = $this->ldap_find_userdn($extmemberuid))) {
return array();
}
}
$ldap_search_pattern = '';
if($this->get_config('nested_groups')) {
$usergroups = $this->ldap_find_user_groups($extmemberuid);
if(count($usergroups) > 0) {
foreach ($usergroups as $group) {
$group = ldap_filter_addslashes($group);
$ldap_search_pattern .= '('.$this->get_config('memberattribute_role'.$role->id).'='.$group.')';
}
}
}
// Default return value
$courses = array();
// Get all the fields we will want for the potential course creation
// as they are light. don't get membership -- potentially a lot of data.
$ldap_fields_wanted = array('dn', $this->get_config('course_idnumber'));
$fullname = $this->get_config('course_fullname');
$shortname = $this->get_config('course_shortname');
$summary = $this->get_config('course_summary');
if (isset($fullname)) {
array_push($ldap_fields_wanted, $fullname);
}
if (isset($shortname)) {
array_push($ldap_fields_wanted, $shortname);
}
if (isset($summary)) {
array_push($ldap_fields_wanted, $summary);
}
// Define the search pattern
if (empty($ldap_search_pattern)) {
$ldap_search_pattern = '('.$this->get_config('memberattribute_role'.$role->id).'='.ldap_filter_addslashes($extmemberuid).')';
} else {
$ldap_search_pattern = '(|' . $ldap_search_pattern .
'('.$this->get_config('memberattribute_role'.$role->id).'='.ldap_filter_addslashes($extmemberuid).')' .
')';
}
$ldap_search_pattern='(&'.$this->get_config('objectclass').$ldap_search_pattern.')';
// Get all contexts and look for first matching user
$ldap_contexts = explode(';', $ldap_contexts);
$ldap_pagedresults = ldap_paged_results_supported($this->get_config('ldap_version'), $this->ldapconnection);
foreach ($ldap_contexts as $context) {
$context = trim($context);
if (empty($context)) {
continue;
}
$ldap_cookie = '';
$servercontrols = array();
$flat_records = array();
do {
if ($ldap_pagedresults) {
// TODO: Remove the old branch of code once PHP 7.3.0 becomes required (Moodle 4.1).
if (version_compare(PHP_VERSION, '7.3.0', '<')) {
// Before 7.3, use this function that was deprecated in PHP 7.4.
ldap_control_paged_result($this->ldapconnection, $this->config->pagesize, true, $ldap_cookie);
} else {
// PHP 7.3 and up, use server controls.
$servercontrols = array(array(
'oid' => LDAP_CONTROL_PAGEDRESULTS, 'value' => array(
'size' => $this->config->pagesize, 'cookie' => $ldap_cookie)));
}
}
if ($this->get_config('course_search_sub')) {
// Use ldap_search to find first user from subtree
// TODO: Remove the old branch of code once PHP 7.3.0 becomes required (Moodle 4.1).
if (version_compare(PHP_VERSION, '7.3.0', '<')) {
$ldap_result = @ldap_search($this->ldapconnection, $context,
$ldap_search_pattern, $ldap_fields_wanted);
} else {
$ldap_result = @ldap_search($this->ldapconnection, $context,
$ldap_search_pattern, $ldap_fields_wanted,
0, -1, -1, LDAP_DEREF_NEVER, $servercontrols);
}
} else {
// Search only in this context
// TODO: Remove the old branch of code once PHP 7.3.0 becomes required (Moodle 4.1).
if (version_compare(PHP_VERSION, '7.3.0', '<')) {
$ldap_result = @ldap_list($this->ldapconnection, $context,
$ldap_search_pattern, $ldap_fields_wanted);
} else {
$ldap_result = @ldap_list($this->ldapconnection, $context,
$ldap_search_pattern, $ldap_fields_wanted,
0, -1, -1, LDAP_DEREF_NEVER, $servercontrols);
}
}
if (!$ldap_result) {
continue;
}
if ($ldap_pagedresults) {
// Get next server cookie to know if we'll need to continue searching.
$ldap_cookie = '';
// TODO: Remove the old branch of code once PHP 7.3.0 becomes required (Moodle 4.1).
if (version_compare(PHP_VERSION, '7.3.0', '<')) {
// Before 7.3, use this function that was deprecated in PHP 7.4.
ldap_control_paged_result_response($this->ldapconnection, $ldap_result, $ldap_cookie);
} else {
// Get next cookie from controls.
ldap_parse_result($this->ldapconnection, $ldap_result, $errcode, $matcheddn,
$errmsg, $referrals, $controls);
if (isset($controls[LDAP_CONTROL_PAGEDRESULTS]['value']['cookie'])) {
$ldap_cookie = $controls[LDAP_CONTROL_PAGEDRESULTS]['value']['cookie'];
}
}
}
// Check and push results. ldap_get_entries() already
// lowercases the attribute index, so there's no need to
// use array_change_key_case() later.
$records = ldap_get_entries($this->ldapconnection, $ldap_result);
// LDAP libraries return an odd array, really. Fix it.
for ($c = 0; $c < $records['count']; $c++) {
array_push($flat_records, $records[$c]);
}
// Free some mem
unset($records);
} while ($ldap_pagedresults && !empty($ldap_cookie));
// If LDAP paged results were used, the current connection must be completely
// closed and a new one created, to work without paged results from here on.
if ($ldap_pagedresults) {
$this->ldap_close();
$this->ldap_connect();
}
if (count($flat_records)) {
$courses = array_merge($courses, $flat_records);
}
}
return $courses;
}
/**
* Search specified contexts for the specified userid and return the
* user dn like: cn=username,ou=suborg,o=org. It's actually a wrapper
* around ldap_find_userdn().
*
* @param string $userid the userid to search for (in external LDAP encoding, no magic quotes).
* @return mixed the user dn or false
*/
protected function ldap_find_userdn($userid) {
global $CFG;
require_once($CFG->libdir.'/ldaplib.php');
$ldap_contexts = explode(';', $this->get_config('user_contexts'));
return ldap_find_userdn($this->ldapconnection, $userid, $ldap_contexts,
$this->userobjectclass,
$this->get_config('idnumber_attribute'), $this->get_config('user_search_sub'));
}
/**
* Find the groups a given distinguished name belongs to, both directly
* and indirectly via nested groups membership.
*
* @param string $memberdn distinguished name to search
* @return array with member groups' distinguished names (can be emtpy)
*/
protected function ldap_find_user_groups($memberdn) {
$groups = array();
$this->ldap_find_user_groups_recursively($memberdn, $groups);
return $groups;
}
/**
* Recursively process the groups the given member distinguished name
* belongs to, adding them to the already processed groups array.
*
* @param string $memberdn distinguished name to search
* @param array reference &$membergroups array with already found
* groups, where we'll put the newly found
* groups.
*/
protected function ldap_find_user_groups_recursively($memberdn, &$membergroups) {
$result = @ldap_read($this->ldapconnection, $memberdn, '(objectClass=*)', array($this->get_config('group_memberofattribute')));
if (!$result) {
return;
}
if ($entry = ldap_first_entry($this->ldapconnection, $result)) {
do {
$attributes = ldap_get_attributes($this->ldapconnection, $entry);
for ($j = 0; $j < $attributes['count']; $j++) {
$groups = ldap_get_values_len($this->ldapconnection, $entry, $attributes[$j]);
foreach ($groups as $key => $group) {
if ($key === 'count') { // Skip the entries count
continue;
}
if(!in_array($group, $membergroups)) {
// Only push and recurse if we haven't 'seen' this group before
// to prevent loops (MS Active Directory allows them!!).
array_push($membergroups, $group);
$this->ldap_find_user_groups_recursively($group, $membergroups);
}
}
}
}
while ($entry = ldap_next_entry($this->ldapconnection, $entry));
}
}
/**
* Given a group name (either a RDN or a DN), get the list of users
* belonging to that group. If the group has nested groups, expand all
* the intermediate groups and return the full list of users that
* directly or indirectly belong to the group.
*
* @param string $group the group name to search
* @param string $memberattibute the attribute that holds the members of the group
* @return array the list of users belonging to the group. If $group
* is not actually a group, returns array($group).
*/
protected function ldap_explode_group($group, $memberattribute) {
switch ($this->get_config('user_type')) {
case 'ad':
// $group is already the distinguished name to search.
$dn = $group;
$result = ldap_read($this->ldapconnection, $dn, '(objectClass=*)', array('objectClass'));
$entry = ldap_first_entry($this->ldapconnection, $result);
$objectclass = ldap_get_values($this->ldapconnection, $entry, 'objectClass');
if (!in_array('group', $objectclass)) {
// Not a group, so return immediately.
return array($group);
}
$result = ldap_read($this->ldapconnection, $dn, '(objectClass=*)', array($memberattribute));
$entry = ldap_first_entry($this->ldapconnection, $result);
$members = @ldap_get_values($this->ldapconnection, $entry, $memberattribute); // Can be empty and throws a warning
if ($members['count'] == 0) {
// There are no members in this group, return nothing.
return array();
}
unset($members['count']);
$users = array();
foreach ($members as $member) {
$group_members = $this->ldap_explode_group($member, $memberattribute);
$users = array_merge($users, $group_members);
}
return ($users);
break;
default:
error_log($this->errorlogtag.get_string('explodegroupusertypenotsupported', 'enrol_ldap',
$this->get_config('user_type_name')));
return array($group);
}
}
/**
* Will create the moodle course from the template
* course_ext is an array as obtained from ldap -- flattened somewhat
*
* @param array $course_ext
* @param progress_trace $trace
* @return mixed false on error, id for the newly created course otherwise.
*/
function create_course($course_ext, progress_trace $trace) {
global $CFG, $DB;
require_once("$CFG->dirroot/course/lib.php");
// Override defaults with template course
$template = false;
if ($this->get_config('template')) {
if ($template = $DB->get_record('course', array('shortname'=>$this->get_config('template')))) {
$template = fullclone(course_get_format($template)->get_course());
unset($template->id); // So we are clear to reinsert the record
unset($template->fullname);
unset($template->shortname);
unset($template->idnumber);
}
}
if (!$template) {
$courseconfig = get_config('moodlecourse');
$template = new stdClass();
$template->summary = '';
$template->summaryformat = FORMAT_HTML;
$template->format = $courseconfig->format;
$template->newsitems = $courseconfig->newsitems;
$template->showgrades = $courseconfig->showgrades;
$template->showreports = $courseconfig->showreports;
$template->maxbytes = $courseconfig->maxbytes;
$template->groupmode = $courseconfig->groupmode;
$template->groupmodeforce = $courseconfig->groupmodeforce;
$template->visible = $courseconfig->visible;
$template->lang = $courseconfig->lang;
$template->enablecompletion = $courseconfig->enablecompletion;
}
$course = $template;
$course->category = $this->get_config('category');
if (!$DB->record_exists('course_categories', array('id'=>$this->get_config('category')))) {
$categories = $DB->get_records('course_categories', array(), 'sortorder', 'id', 0, 1);
$first = reset($categories);
$course->category = $first->id;
}
// Override with required ext data
$course->idnumber = $course_ext[$this->get_config('course_idnumber')][0];
$course->fullname = $course_ext[$this->get_config('course_fullname')][0];
$course->shortname = $course_ext[$this->get_config('course_shortname')][0];
if (empty($course->idnumber) || empty($course->fullname) || empty($course->shortname)) {
// We are in trouble!
$trace->output(get_string('cannotcreatecourse', 'enrol_ldap').' '.var_export($course, true));
return false;
}
$summary = $this->get_config('course_summary');
if (!isset($summary) || empty($course_ext[$summary][0])) {
$course->summary = '';
} else {
$course->summary = $course_ext[$this->get_config('course_summary')][0];
}
// Check if the shortname already exists if it does - skip course creation.
if ($DB->record_exists('course', array('shortname' => $course->shortname))) {
$trace->output(get_string('duplicateshortname', 'enrol_ldap', $course));
return false;
}
$newcourse = create_course($course);
return $newcourse->id;
}
/**
* Will update a moodle course with new values from LDAP
* A field will be updated only if it is marked to be updated
* on sync in plugin settings
*
* @param object $course
* @param array $externalcourse
* @param progress_trace $trace
* @return bool
*/
protected function update_course($course, $externalcourse, progress_trace $trace) {
global $CFG, $DB;
$coursefields = array ('shortname', 'fullname', 'summary');
static $shouldupdate;
// Initialize $shouldupdate variable. Set to true if one or more fields are marked for update.
if (!isset($shouldupdate)) {
$shouldupdate = false;
foreach ($coursefields as $field) {
$shouldupdate = $shouldupdate || $this->get_config('course_'.$field.'_updateonsync');
}
}
// If we should not update return immediately.
if (!$shouldupdate) {
return false;
}
require_once("$CFG->dirroot/course/lib.php");
$courseupdated = false;
$updatedcourse = new stdClass();
$updatedcourse->id = $course->id;
// Update course fields if necessary.
foreach ($coursefields as $field) {
// If field is marked to be updated on sync && field data was changed update it.
if ($this->get_config('course_'.$field.'_updateonsync')
&& isset($externalcourse[$this->get_config('course_'.$field)][0])
&& $course->{$field} != $externalcourse[$this->get_config('course_'.$field)][0]) {
$updatedcourse->{$field} = $externalcourse[$this->get_config('course_'.$field)][0];
$courseupdated = true;
}
}
if (!$courseupdated) {
$trace->output(get_string('courseupdateskipped', 'enrol_ldap', $course));
return false;
}
// Do not allow empty fullname or shortname.
if ((isset($updatedcourse->fullname) && empty($updatedcourse->fullname))
|| (isset($updatedcourse->shortname) && empty($updatedcourse->shortname))) {
// We are in trouble!
$trace->output(get_string('cannotupdatecourse', 'enrol_ldap', $course));
return false;
}
// Check if the shortname already exists if it does - skip course updating.
if (isset($updatedcourse->shortname)
&& $DB->record_exists('course', array('shortname' => $updatedcourse->shortname))) {
$trace->output(get_string('cannotupdatecourse_duplicateshortname', 'enrol_ldap', $course));
return false;
}
// Finally - update course in DB.
update_course($updatedcourse);
$trace->output(get_string('courseupdated', 'enrol_ldap', $course));
return true;
}
/**
* Automatic enrol sync executed during restore.
* Useful for automatic sync by course->idnumber or course category.
* @param stdClass $course course record
*/
public function restore_sync_course($course) {
// TODO: this can not work because restore always nukes the course->idnumber, do not ask me why (MDL-37312)
// NOTE: for now restore does not do any real logging yet, let's do the same here...
$trace = new error_log_progress_trace();
$this->sync_enrolments($trace, $course->id);
}
/**
* Restore instance and map settings.
*
* @param restore_enrolments_structure_step $step
* @param stdClass $data
* @param stdClass $course
* @param int $oldid
*/
public function restore_instance(restore_enrolments_structure_step $step, stdClass $data, $course, $oldid) {
global $DB;
// There is only 1 ldap enrol instance per course.
if ($instances = $DB->get_records('enrol', array('courseid'=>$data->courseid, 'enrol'=>'ldap'), 'id')) {
$instance = reset($instances);
$instanceid = $instance->id;
} else {
$instanceid = $this->add_instance($course, (array)$data);
}
$step->set_mapping('enrol', $oldid, $instanceid);
}
/**
* Restore user enrolment.
*
* @param restore_enrolments_structure_step $step
* @param stdClass $data
* @param stdClass $instance
* @param int $oldinstancestatus
* @param int $userid
*/
public function restore_user_enrolment(restore_enrolments_structure_step $step, $data, $instance, $userid, $oldinstancestatus) {
global $DB;
if ($this->get_config('unenrolaction') == ENROL_EXT_REMOVED_UNENROL) {
// Enrolments were already synchronised in restore_instance(), we do not want any suspended leftovers.
} else if ($this->get_config('unenrolaction') == ENROL_EXT_REMOVED_KEEP) {
if (!$DB->record_exists('user_enrolments', array('enrolid'=>$instance->id, 'userid'=>$userid))) {
$this->enrol_user($instance, $userid, null, 0, 0, $data->status);
}
} else {
if (!$DB->record_exists('user_enrolments', array('enrolid'=>$instance->id, 'userid'=>$userid))) {
$this->enrol_user($instance, $userid, null, 0, 0, ENROL_USER_SUSPENDED);
}
}
}
/**
* Restore role assignment.
*
* @param stdClass $instance
* @param int $roleid
* @param int $userid
* @param int $contextid
*/
public function restore_role_assignment($instance, $roleid, $userid, $contextid) {
global $DB;
if ($this->get_config('unenrolaction') == ENROL_EXT_REMOVED_UNENROL or $this->get_config('unenrolaction') == ENROL_EXT_REMOVED_SUSPENDNOROLES) {
// Skip any roles restore, they should be already synced automatically.
return;
}
// Just restore every role.
if ($DB->record_exists('user_enrolments', array('enrolid'=>$instance->id, 'userid'=>$userid))) {
role_assign($roleid, $userid, $contextid, 'enrol_'.$instance->enrol, $instance->id);
}
}
}