My XSRF Prevention code isn't working

yanjchan · December 25, 2009

First of all, thanks for the generous help you guys have given me in the past on this forum.

Second, I apologize in advance if my code is hard to read, most of it was done in a rush.

Here goes:

login.php

<?php
			// create anti-csrf cookie value
			$hash = sha1(time().rand().strlen(rand()));
			$hash = substr($hash, 0, ;
			if (isset($_COOKIE['xsrf[0]'])) {
				$i = 0;
				while (isset($_COOKIE['xsrf['.$i.']'])) {
					$i++;
				}
				setcookie('xsrf['.$i.']', $hash, 0, '/citizen/', '.ch4n.net');
			} else {
				setcookie('xsrf[0]', $hash, 0, '/citizen/', '.ch4n.net');
			}

	   
?>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title>Citizen - Login</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<link rel="stylesheet" href="default.css">
</head>

<body>
<div class="header"><?php include("menu.html"); ?></div>

<div class="body">

<?php if (!empty($_GET['errors'])): ?>
<ul>
    <li><?php print implode("</li>\n\t<li>", explode(';', $_GET['errors'])); ?></li>
</ul>
<?php endif; ?>

<form name="login" action="login_process.php" method="POST">
<input type="hidden" name="xsrfi" value="<?php echo $i; ?>" />
<input type="hidden" name="xsrf" value="<?php echo $hash; ?>" />
<table cellpadding="1" cellspacing="1" id="login">
	<tbody>
		<tr class="username">
			<th>Username</th>
			<td><input type="text" id="username" name="username" maxlength="20" /><br /></td>
		</tr>
		<tr class="password">
			<th>Password</th>
			<td><input type="password" id="password" name="password" maxlength="20" /></td>
		</tr>

	</tbody>
</table>
<input type="submit" name="submit" value="Login!" />
</form>	

</div>

</body>
</html>

login_process.php

<?php
if ($_COOKIE['xsrf['.$_POST['xsrfi'].']'] !== $_POST['xsrf'] || !isset($_COOKIE['xsrf['.$_POST['xsrfi'].']'])):
$errors = "It appears you have been a victim of a browser attack! Please run a virus scan before continuing online activities.;".$_COOKIE['xsrf['.$_POST['xsrfi'].']'].";".$_POST['xsrfi'].";".$_POST['xsrf'];
setcookie('xsrf['.$_POST['xsrfi'].']', sha1($hash), time()-1, '/citizen/', '.ch4n.net');
header("Location: login.php?errors=$errors");
endif;
setcookie('xsrf', sha1($hash), time()-1, '/citizen/', '.ch4n.net');
require('authent.php');
$user = mysql_escape_string(htmlentities($_POST['username']));
$pass = mysql_escape_string(htmlentities($_POST['password']));

$passwordhash = hashPassword($pass);

if(table_exists("user_".$user, 's2zsl9rx_citizen')):
	// Make a MySQL Connection
	require('c2db.php');
	mysql_select_db("s2zsl9rx_citizen") or die(mysql_error());

	$result = mysql_query("SELECT * FROM user_$user WHERE type='001'")
	or die(mysql_error());  

	$row = mysql_fetch_assoc($result);

		if ($row['val'] == $passwordhash):
			$value = $user.','.$row['val'].','.hashPassword(getip());
			setcookie('citizeninfo', $value, time()+3600, '/citizen/', 'ch4n.net');
			mysql_close();
			header("Location: game.php");
		else:
			$errors = 'Username and/or password are incorrect'.$row['val'];
			mysql_close();
        		header("Location: login.php?errors=$errors");
		endif;


else:
        $errors = 'Username and/or password are incorrect';
        header("Location: login.php?errors=$errors");
endif;
?>

Any help at all would be very much appreciated.

ignace · December 25, 2009

Read this article by Chris Shiflett: http://shiflett.org/articles/cross-site-request-forgeries

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My XSRF Prevention code isn't working

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