Security of $_SESSION

[php_guy]

Hello all,

 

I have this at the top of my page to ensure that only logged in users can see the content

if(!isset($_SESSION['myusername'])){
header("Location:login.php");
exit;
} else {
$username = $_SESSION['myusername'];
}

 

This, of course is checked in the login form against a database and only stored in $_SESSION once it's verified...

 

Now, my question is -- how secure is this? For example, could someone have $_SESSION['myusername'] set from another webpage, then navigate to mine and be able to see the protected content?

 

 

[johnny86]

Session data is stored locally on the server. So there is no way another site could spoof session data. The problem you're describing could be that someone had a valid PHP session ID stored in their cookie for your site. Note that cookies cannot be set by other site to point to your domain.

 

You could look into PHPFreaks tutorial here: http://www.phpfreaks.com/tutorial/php-security