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/**
* Contains a helper class for the Shibboleth authentication plugin.
*
* @package auth_shibboleth
* @copyright 2018 Mark Nelson
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
namespace auth_shibboleth;
defined('MOODLE_INTERNAL') || die();
/**
* The helper class for the Shibboleth authentication plugin.
*
* @package auth_shibboleth
* @copyright 2018 Mark Nelson
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class helper {
/**
* Delete session of user using file sessions.
*
* @param string $spsessionid SP-provided Shibboleth Session ID
* @return \SoapFault or void if everything was fine
*/
public static function logout_file_session($spsessionid) {
global $CFG;
if (!empty($CFG->session_file_save_path)) {
$dir = $CFG->session_file_save_path;
} else {
$dir = $CFG->dataroot . '/sessions';
}
if (is_dir($dir)) {
if ($dh = opendir($dir)) {
// Read all session files.
while (($file = readdir($dh)) !== false) {
// Check if it is a file.
if (is_file($dir.'/'.$file)) {
// Read session file data.
$data = file($dir.'/'.$file);
if (isset($data[0])) {
$usersession = self::unserializesession($data[0]);
// Check if we have found session that shall be deleted.
if (isset($usersession['SESSION']) && isset($usersession['SESSION']->shibboleth_session_id)) {
// If there is a match, delete file.
if ($usersession['SESSION']->shibboleth_session_id == $spsessionid) {
// Delete session file.
if (!unlink($dir.'/'.$file)) {
return new SoapFault('LogoutError', 'Could not delete Moodle session file.');
}
}
}
}
}
}
closedir($dh);
}
}
}
/**
* Delete session of user using DB sessions.
*
* @param string $spsessionid SP-provided Shibboleth Session ID
*/
public static function logout_db_session($spsessionid) {
global $CFG, $DB;
$sessions = $DB->get_records_sql(
'SELECT userid, sessdata FROM {sessions} WHERE timemodified > ?',
array(time() - $CFG->sessiontimeout)
);
foreach ($sessions as $session) {
// Get user session from DB.
$usersession = self::unserializesession(base64_decode($session->sessdata));
if (isset($usersession['SESSION']) && isset($usersession['SESSION']->shibboleth_session_id)) {
// If there is a match, kill the session.
if ($usersession['SESSION']->shibboleth_session_id == trim($spsessionid)) {
// Delete this user's sessions.
\core\session\manager::kill_user_sessions($session->userid);
}
}
}
}
/**
* Unserialize a session string.
*
* @param string $serializedstring
* @return array
*/
private static function unserializesession($serializedstring) {
$variables = array();
$index = 0;
// Find next delimiter after current index. It's key being the characters between those points.
while ($delimiterpos = strpos($serializedstring, '|', $index)) {
$key = substr($serializedstring, $index, $delimiterpos - $index);
// Start unserializing immediately after the delimiter. PHP will read as much valid data as possible.
$value = unserialize(substr($serializedstring, $delimiterpos + 1),
['allowed_classes' => ['stdClass']]);
$variables[$key] = $value;
// Advance index beyond the length of the previously captured serialized value.
$index = $delimiterpos + 1 + strlen(serialize($value));
}
return $variables;
}
}