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Posted By

MMDeveloper on 10/01/08


Tagged

php blocking security access


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php based access blocking

Published in: PHP 

URL: http://www.mechanicmatt.com

Using the code below, you simply include the file in your application like this:

$redirect = true; include("/www/htdocs/checkBlocked.php");

if $redirect is true, then (if the visitor is blocked), it will automatically redirect them to the URL specified in the script below. If it does not, then it simply returns a boolean true/false if the user is blocked or not (for custom processing) in a variabled called '$blocker_isBlocked'.

To add IP's and/or domains to the blacklist, just add them to the respective arrays where the commented lines are.

Plain TextExpand 
  1. <?php
  2.  
  3. $blocker_isBlocked_redirect = "http://www.mechanicmatt.com/Access+Denied-p71.html";
  4. $blocker_isBlocked_return = "||{{{error}}}||";
  5. $blocker_isBlocked_err_msg = "You have been temporarily blocked from accessing this content.";
  6.  
  7.  
  8.  
  9.  
  10.  
  11.  
  12. //blocking class
  13. class blocker {
  14.  
  15. 	var $ips = NULL;
  16. 	var $domains = NULL;
  17. 	var $currentEnv = NULL;
  18. 	var $blocked = NULL;
  19. 	var $redirect = NULL;
  20.  
  21. 	function blocker($env, $redirect = true) {
  22. 		$this->ips = array (
  23. 				//"67.191.103.115"
  24. 			);
  25.  
  26. 		$this->domains = array (
  27. 				//"nefec.org"
  28. 			);
  29.  
  30. 		$this->blocked = false;
  31.  
  32. 		if (is_null($redirect)) {
  33. 			$this->redirect = true;
  34. 		}
  35. 		else {
  36. 			$this->redirect = $redirect;
  37. 		}
  38.  
  39. 		$this->currentEnv = $env;
  40. 	}
  41.  
  42. 	function isBlocked() {
  43. 		global $blocker_isBlocked_redirect;
  44.  
  45. 		$this->checkIP();
  46. 		$this->checkHostname();
  47.  
  48. 		if ($this->blocked == true && $this->redirect == true) {
  49. 			header("Location: " . $blocker_isBlocked_redirect);
  50. 		}
  51. 		else {
  52. 			return $this->blocked;
  53. 		}
  54. 	}
  55.  
  56. 	function checkIP() {
  57. 		if (in_array($this->currentEnv["REMOTE_ADDR"], $this->ips)) { //check for exact match
  58. 			$this->blocked = true;
  59. 		}
  60. 		else { //exhaustive partial match
  61. 			foreach ($this->ips as $ip) {
  62. 				if (ereg("^(".$ip.")", $this->currentEnv["REMOTE_ADDR"])) {
  63. 					$this->blocked = true;
  64. 				}
  65. 				else {
  66.  
  67. 				}
  68. 			}
  69. 		}
  70. 	}
  71.  
  72. 	function checkHostname() {
  73. 		$userHostName = gethostbyaddr($this->currentEnv["REMOTE_ADDR"]);
  74. 		foreach ($this->domains as $k => $v) {
  75. 			if (eregi($v, $userHostName)) {
  76. 				$this->blocked = true;
  77. 			} else {}
  78. 		}
  79. 	}
  80. }
  81.  
  82. $blocker = new blocker($_SERVER, $redirect);
  83. $blocker_isBlocked = $blocker->isBlocked();
  84. ?>

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