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Scripts > PHP > Beveiliging > beveiliging met verificatie code

beveiliging met verificatie code

Auteur: Stijn1 - 27 september 2004 - 19:34 - Gekeurd door: Dennisvb - Hits: 17264 - Aantal punten: 4.14 (11 stemmen)




Zo hier is het dan, het scriptje voor wat extra beveiliging

Code:
-- form.php --
php code - Bekijk de code zonder highlighting - Klap code in 
  1. <?PHP
  3. function form_val($url, $chars = false, $this_chars = false){
  4. 	if($chars == false || !is_numeric($chars)){
  5. 		$chars = 6;
  6. 	}
  7. 	if($this_chars == false || !is_array($this_chars)){
  8. 		$this_chars = array('a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
  9. 							'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
  10. 							'0', '1', '2', '3', '4', '5', '6', '7', '8', '9'	
  11. 							);
  12. 	}
  13. 	if($chars == false || !is_numeric($chars)){
  14. 		$chars = 6;
  15. 	}
  16. 	if(empty($_SESSION['validate_code'])){
  17. 		$save = '';
  18. 		for($for = 0; $for < $chars; $for++){
  19. 			$save .= $this_chars[mt_rand(0, (count($this_chars)-1))];
  20. 		}
  21. 		$_SESSION['validate_code'] = $save;
  22. 	}
  23. 	$ret = '<table border="0" cellpadding="3" cellspacing="0">
  24.   <form method="POST">
  25.     <tr>
  26.       <td><img src="validate.php" /></td>
  27.     </tr>
  28.     <tr>
  29.       <td><input type="text" name="val"></td>
  30.     </tr>
  31.     <tr>
  32.       <td><input type="submit" name="valid" value="Validate"></td>
  33.     </tr>
  34.   </form>
  35. </table>';
  36. 	if(isset($_POST['valid'])){
  37. 		if($_POST['val'] == $_SESSION['validate_code']){
  38. 			$_SESSION['validate_code'] = '';
  39. 			header('Location: '.$url);
  40. 		}
  41. 		else{
  42. 			$ret .= 'De code klopt niet!';	
  43.  
  44. 		}
  45. 	}
  46. 	return $ret;
  47.  
  48. }
  49. if($_GET['act'] == 'Yep'){
  50. 	echo 'Goed zo!';
  51. }
  52. else{
  53. 	echo form_val('?act=Yep');
  54. }
  55. ?>


-- validate.php --
php code - Bekijk de code zonder highlighting - Klap code in 
  1. <?PHP
  3. function validate(){
  4. 	$save   = $_SESSION['validate_code'];
  5. 	$width  = strlen($save)*15;
  6. 	$height = 30;
  7. 	header("Content-type: image/png");
  8. 	$image = imagecreate($width, $height);
  9. 	$bgcol = imagecolorallocate($image, 255, 255, 255); // = white
  10. 	$licol = imagecolorallocate($image, 128, 128, 128);   // = gray
  11. 	$tecol = imagecolorallocate($image, 0, 0, 0);   // = black
  12. 	imageline($image, 0, 0, $width, 0, $licol);
  13. 	imageline($image, 0, 5, $width, 5, $licol);
  14. 	imageline($image, 0, 10, $width, 10, $licol);
  15. 	imageline($image, 0, 15, $width, 15, $licol);
  16. 	imageline($image, 0, 20, $width, 20, $licol);
  17. 	imageline($image, 0, 25, $width, 25, $licol);
  18. 	imageline($image, 0, 29, $width, 29, $licol);
  19. 	imageline($image, ($width-1), 0, ($width-1), $height, $licol);
  20. 	for($for3 = 0; $for3 < $width; $for3++){
  21. 		if($for3%5 == 0){
  22. 			imageline($image, $for3, 0, $for3, $height, $licol);
  23. 		}
  24. 	}
  25. 	for($for2 = 0; $for2 < strlen($save); $for2++){
  26. 		imagestring($image, 5, (2+($for2*15)), (mt_rand(2, 15)),  $save{$for2}, $tecol);
  27. 	}
  28. 	return imagepng($image);
  29. 	imagedestroy($image);
  30. }
  31. echo validate();
  32. ?>
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