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| <?php | |
| namespace manager; | |
| class sessionManager{ | |
| private static $prefix; | |
| /*************************/ | |
| /* SECURE SHA1 ALGORITHM */ | |
| /*************************/ | |
| public static function secure_sha1($data){ | |
| return sha1( '">\[..|{@#))'.sha1($data.'_)Q@#((%*_$%(@#') ); | |
| } | |
| /*****************************/ | |
| /* INITIALISATION DE SESSION */ | |
| /*****************************/ | |
| private static function reset_session($session_id=null){ | |
| // On ferme la session | |
| session_destroy(); | |
| // On definit l'id session si donne en argument | |
| if( $session_id != null ) | |
| session_id( $session_id ); | |
| // Precaution: on met a jour le cookie | |
| setcookie('PHPSESSID', session_id(), time()+60*30 ); | |
| // On redemarre la session avec le bon id session | |
| \session_start(); | |
| // On met a jour le token | |
| self::update_token(); | |
| header('Refresh: 0'); | |
| } | |
| /*******************/ | |
| /* GENERE UN TOKEN */ | |
| /*******************/ | |
| private static function update_token(){ | |
| $token = self::$prefix.self::secure_sha1(uniqid()); | |
| // On definit le token en session | |
| $_SESSION['session_token'] = $token; | |
| // On definit le token en cookie | |
| $_COOKIE['session_token'] = $_SESSION['session_token']; | |
| setcookie('session_token', $_COOKIE['session_token'], time()+60*30 ); | |
| } | |
| /************/ | |
| /* AMORCEUR */ | |
| /************/ | |
| public static function session_start(){ | |
| /* [1] Génération et Gestion des donnees a utiliser | |
| ==============================================================*/ | |
| // On genere le hash a partir des donnees personnelles | |
| self::$prefix = self::secure_sha1( $_SERVER['REMOTE_ADDR'].$_SERVER['HTTP_USER_AGENT'] ); | |
| // On cree un id session associe a ces donnees personnelles | |
| $sessid = substr(self::$prefix,0,5) . substr(self::secure_sha1(uniqid()),0,24); | |
| // On genere un token pour l'execution suivante | |
| $token = self::$prefix.self::secure_sha1(uniqid()); | |
| // On definit/recupere le token | |
| $session_token = (isset($_COOKIE['session_token'])) ? $_COOKIE['session_token'] : null; | |
| /* [2] Verification de l'id session | |
| ==============================================================*/ | |
| \session_start(); | |
| // On verifie l'id session (5 premiers chars du hash des donnees perso) | |
| $valid_sessid = strpos( session_id(), substr(self::$prefix,0,5) ) === 0; | |
| // Si id session incorrect ou pas de token | |
| if( !$valid_sessid ) | |
| self::reset_session( $sessid ); // On initialise la session (bon id session) | |
| // si id session invalide | |
| /* [3] Verification du token | |
| ==============================================================*/ | |
| // On verifie que le token est valide | |
| $valid_token = $session_token != null; // verification de l'existence du cookie | |
| $valid_token = $valid_token && strpos($session_token, self::$prefix) === 0; // verification des donnes personnelles | |
| $valid_token = $valid_token && isset($_SESSION['session_token']); // verification que la variable session associee existe | |
| $valid_token = $valid_token && $_SESSION['session_token'] == $_COOKIE['session_token']; // verification que la session est coherente | |
| /* [4] Si token inexistant | |
| ==============================================================*/ | |
| if( !$valid_token ) | |
| self::reset_session($sessid); // On initialise la session | |
| else | |
| self::update_token(); // Dans tous les cas, on cree un nouveau token | |
| } | |
| } | |
| ?> |