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<?php
namespace Shaarli;
/**
* Manages the server-side session
*/
class SessionManager
{
protected $session = [];
/**
* Constructor
*
* @param array $session The $_SESSION array (reference)
* @param ConfigManager $conf ConfigManager instance
*/
public function __construct(& $session, $conf)
{
$this->session = &$session;
$this->conf = $conf;
}
/**
* Generates a session token
*
* @return string token
*/
public function generateToken()
{
$token = sha1(uniqid('', true) .'_'. mt_rand() . $this->conf->get('credentials.salt'));
$this->session['tokens'][$token] = 1;
return $token;
}
/**
* Checks the validity of a session token, and destroys it afterwards
*
* @param string $token The token to check
*
* @return bool true if the token is valid, else false
*/
public function checkToken($token)
{
if (! isset($this->session['tokens'][$token])) {
// the token is wrong, or has already been used
return false;
}
// destroy the token to prevent future use
unset($this->session['tokens'][$token]);
return true;
}
/**
* Validate session ID to prevent Full Path Disclosure.
*
* See #298.
* The session ID's format depends on the hash algorithm set in PHP settings
*
* @param string $sessionId Session ID
*
* @return true if valid, false otherwise.
*
* @see http://php.net/manual/en/function.hash-algos.php
* @see http://php.net/manual/en/session.configuration.php
*/
public static function checkId($sessionId)
{
if (empty($sessionId)) {
return false;
}
if (!$sessionId) {
return false;
}
if (!preg_match('/^[a-zA-Z0-9,-]{2,128}$/', $sessionId)) {
return false;
}
return true;
}
}
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