Article:		Ten Security Checks for PHP, Part 1
Subject:		get/post
Date:		2004-11-17 03:56:54
From:		Lancelotti
Response to: get/post
Cant you use this to security of your incluedes. $page = "path_to_file/$_GET[page].php"; // put de get variable in string, and indicated de directory where your subpages are if (!file_exists($page)) { $page = "index.php"; } // if file not exists use the index.php include($page); // include de file Note. Include all your subpages in path_to_file and your extension may be .php

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• get/post
  2004-11-17 15:05:41  Clancy Malcolm [Reply | View]
  
  
  Lancelotti,
  
  The above code provides a little security - it limits people to only including PHP files from the local machine. However, a user can choose ANY PHP file on the machine (subject to the web server's account permissions) and include that file by using a value for page like '../../example'.
  
  You could prevent this by checking the value using a regular expression (maybe '^[a-z_]*$') or by using the realpath function to check that the resulting page is still in the desired directory.
  
  (Note that if you were using the safe_mode setting it would be a bit different, but may still be insecure).
  
  Hope this helps.
  
  Regards,
  Clancy