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<?php
namespace Shaarli\Security;
use Shaarli\Config\ConfigManager;
/**
* Manages the server-side session
*/
class SessionManager
{
/** @var int Session expiration timeout, in seconds */
public static $SHORT_TIMEOUT = 3600; // 1 hour
/** @var int Session expiration timeout, in seconds */
public static $LONG_TIMEOUT = 31536000; // 1 year
/** @var array Local reference to the global $_SESSION array */
protected $session = [];
/** @var ConfigManager Configuration Manager instance **/
protected $conf = null;
/** @var bool Whether the user should stay signed in (LONG_TIMEOUT) */
protected $staySignedIn = false;
/**
* Constructor
*
* @param array $session The $_SESSION array (reference)
* @param ConfigManager $conf ConfigManager instance
*/
public function __construct(& $session, $conf)
{
$this->session = &$session;
$this->conf = $conf;
}
/**
* Define whether the user should stay signed in across browser sessions
*
* @param bool $staySignedIn Keep the user signed in
*/
public function setStaySignedIn($staySignedIn)
{
$this->staySignedIn = $staySignedIn;
}
/**
* 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;
}
/**
* Store user login information after a successful login
*
* @param string $clientIpId Client IP address identifier
*/
public function storeLoginInfo($clientIpId)
{
// Generate unique random number (different than phpsessionid)
$this->session['uid'] = sha1(uniqid('', true) . '_' . mt_rand());
$this->session['ip'] = $clientIpId;
$this->session['username'] = $this->conf->get('credentials.login');
$this->extendTimeValidityBy(self::$SHORT_TIMEOUT);
}
/**
* Extend session validity
*/
public function extendSession()
{
if ($this->staySignedIn) {
return $this->extendTimeValidityBy(self::$LONG_TIMEOUT);
}
return $this->extendTimeValidityBy(self::$SHORT_TIMEOUT);
}
/**
* Extend expiration time
*
* @param int $duration Expiration time extension (seconds)
*
* @return int New session expiration time
*/
protected function extendTimeValidityBy($duration)
{
$expirationTime = time() + $duration;
$this->session['expires_on'] = $expirationTime;
return $expirationTime;
}
/**
* Logout a user by unsetting all login information
*
* See:
* - https://secure.php.net/manual/en/function.setcookie.php
*/
public function logout()
{
if (isset($this->session)) {
unset($this->session['uid']);
unset($this->session['ip']);
unset($this->session['expires_on']);
unset($this->session['username']);
unset($this->session['visibility']);
unset($this->session['untaggedonly']);
}
}
/**
* Check whether the session has expired
*
* @param string $clientIpId Client IP address identifier
*
* @return bool true if the session has expired, false otherwise
*/
public function hasSessionExpired()
{
if (empty($this->session['uid'])) {
return true;
}
if (time() >= $this->session['expires_on']) {
return true;
}
return false;
}
/**
* Check whether the client IP address has changed
*
* @param string $clientIpId Client IP address identifier
*
* @return bool true if the IP has changed, false if it has not, or
* if session protection has been disabled
*/
public function hasClientIpChanged($clientIpId)
{
if ($this->conf->get('security.session_protection_disabled') === true) {
return false;
}
if ($this->session['ip'] == $clientIpId) {
return false;
}
return true;
}
}
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