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<?php
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// This file is part of Moodle - http://moodle.org/
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//
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// Moodle is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Moodle is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
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/**
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* Contains a helper class for the Shibboleth authentication plugin.
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*
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* @package auth_shibboleth
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* @copyright 2018 Mark Nelson <markn@moodle.com>
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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namespace auth_shibboleth;
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defined('MOODLE_INTERNAL') || die();
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/**
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* The helper class for the Shibboleth authentication plugin.
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*
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* @package auth_shibboleth
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* @copyright 2018 Mark Nelson <markn@moodle.com>
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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class helper {
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/**
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* Delete session of user using file sessions.
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*
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* @param string $spsessionid SP-provided Shibboleth Session ID
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* @return \SoapFault or void if everything was fine
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*/
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public static function logout_file_session($spsessionid) {
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global $CFG;
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if (!empty($CFG->session_file_save_path)) {
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$dir = $CFG->session_file_save_path;
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} else {
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$dir = $CFG->dataroot . '/sessions';
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}
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if (is_dir($dir)) {
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if ($dh = opendir($dir)) {
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// Read all session files.
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while (($file = readdir($dh)) !== false) {
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// Check if it is a file.
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if (is_file($dir.'/'.$file)) {
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// Read session file data.
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$data = file($dir.'/'.$file);
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if (isset($data[0])) {
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$usersession = self::unserializesession($data[0]);
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// Check if we have found session that shall be deleted.
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if (isset($usersession['SESSION']) && isset($usersession['SESSION']->shibboleth_session_id)) {
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// If there is a match, delete file.
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if ($usersession['SESSION']->shibboleth_session_id == $spsessionid) {
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// Delete session file.
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if (!unlink($dir.'/'.$file)) {
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return new SoapFault('LogoutError', 'Could not delete Moodle session file.');
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}
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}
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}
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}
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}
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}
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closedir($dh);
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}
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}
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}
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/**
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* Delete session of user using DB sessions.
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*
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* @param string $spsessionid SP-provided Shibboleth Session ID
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*/
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public static function logout_db_session($spsessionid) {
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global $CFG, $DB;
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$sessions = $DB->get_records_sql(
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'SELECT userid, sessdata FROM {sessions} WHERE timemodified > ?',
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array(time() - $CFG->sessiontimeout)
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);
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foreach ($sessions as $session) {
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// Get user session from DB.
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$usersession = self::unserializesession(base64_decode($session->sessdata));
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if (isset($usersession['SESSION']) && isset($usersession['SESSION']->shibboleth_session_id)) {
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// If there is a match, kill the session.
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if ($usersession['SESSION']->shibboleth_session_id == trim($spsessionid)) {
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// Delete this user's sessions.
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\core\session\manager::kill_user_sessions($session->userid);
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}
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}
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}
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}
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/**
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* Unserialize a session string.
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*
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* @param string $serializedstring
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* @return array
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*/
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private static function unserializesession($serializedstring) {
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$variables = array();
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$index = 0;
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// Find next delimiter after current index. It's key being the characters between those points.
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while ($delimiterpos = strpos($serializedstring, '|', $index)) {
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$key = substr($serializedstring, $index, $delimiterpos - $index);
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// Start unserializing immediately after the delimiter. PHP will read as much valid data as possible.
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$value = unserialize(substr($serializedstring, $delimiterpos + 1),
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['allowed_classes' => ['stdClass']]);
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$variables[$key] = $value;
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// Advance index beyond the length of the previously captured serialized value.
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$index = $delimiterpos + 1 + strlen(serialize($value));
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}
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return $variables;
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}
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}
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