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