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xss_example.php
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xss_example.php
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<?php
session_start();
// attempt to connect to the database
try {
$pdo = new PDO('mysql:host=localhost;dbname=selfdirected', 'root', '');
$pdo->setAttribute(PDO::ATTR_DEFAULT_FETCH_MODE, PDO::FETCH_ASSOC);
} catch (PDOException $ex) {
echo $ex->getMessage();
die('Critical Database Error Occured');
}
// did the user just try to add a post?
if (isset($_POST['message'])) {
$stmt_add = $pdo->prepare('INSERT INTO xss (postID, message) VALUES (DEFAULT, :message)');
$stmt_add->bindValue(':message', $_POST['message'], PDO::PARAM_STR);
$stmt_add->execute();
// prevent accidental resubmission via refresh
header('Location: /cross-site-scripting/example');
}
// fetch all posts
$stmt = $pdo->query('SELECT * FROM xss');
?>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>XSS Example</title>
<!-- Bootstrap -->
<link href="/assets/css/bootstrap.min.css" rel="stylesheet">
<!-- HTML5 shim and Respond.js for IE8 support of HTML5 elements and media queries -->
<!-- WARNING: Respond.js doesn't work if you view the page via file:// -->
<!--[if lt IE 9]>
<script src="/assets/js/html5shiv.min.js"></script>
<script src="/assets/js/respond.min.js"></script>
<![endif]-->
</head>
<body>
<div class="container">
<h1>Guestbook! :)</h1>
<hr>
<br><br>
<h3>Add a new post!</h3>
<form action="/cross-site-scripting/example" method="post">
<textarea name="message" rows="4" cols="50"></textarea><br>
<button type="submit">Submit</button>
</form>
<hr>
<br>
<h3>Existing Posts</h3>
<hr>
<?php if ($stmt->rowCount() > 0) { ?>
<?php while ($row = $stmt->fetch()) { ?>
<span>Post ID: <?php echo $row['postID']; ?></span><br>
<span>Post Content:
<?php echo $row['message']; ?>
</span>
<br><br><br>
<?php } ?>
<?php } else { ?>
<h6>No entries found in database.</h6>
<?php } ?>
</div>
<!-- jQuery (necessary for Bootstrap's JavaScript plugins) -->
<script src="/assets/js/jquery.min.js"></script>
<!-- Include all compiled plugins (below), or include individual files as needed -->
<script src="/assets/js/bootstrap.min.js"></script>
<!-- IE10 viewport hack for Surface/desktop Windows 8 bug -->
<script>
/*!
* IE10 viewport hack for Surface/desktop Windows 8 bug
* Copyright 2014 Twitter, Inc.
* Licensed under the Creative Commons Attribution 3.0 Unported License. For
* details, see http://creativecommons.org/licenses/by/3.0/.
*/
!function(){"use strict";if(navigator.userAgent.match(/IEMobile\/10\.0/)){var e=document.createElement("style");e.appendChild(document.createTextNode("@-ms-viewport{width:auto!important}")),document.querySelector("head").appendChild(e)}}();
</script>
</body>
</html>