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example.php
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example.php
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<?php
header("X-XSS-Protection:0");
?>
<!DOCTYPE html>
<html>
<head>
</head>
<body>
<h1>XSS Testbed</h1>
<p>This testbed is designed to demonstrate the usage of PHP's functions for preventing XSS attacks.</p>
<p>Safari and Chrome have some inbuilt protection against the XSS attack in this demo (i.e rendering it to the same page), so the X-XSS-Protection header is set to 0 to turn off their in built auditor.</p>
<form action='example.php' method='post'>
<label for="user_input">User Input</label><br>
<textarea name='user_input' cols='80' rows='10'>
My name is HAL.
<script>
alert("This should not run!");
alert("Seriously!");
</script>
Goodbye.
</textarea>
<br>
<label>PHP Method</label><br/>
<input type="radio" name="method" value="none" id="none" checked>None
<input type="radio" name="method" value="strip" id="strip">strip_tags
<input type="radio" name="method" value="escape" id="escape">htmlspecialchars <br>
<input type="submit" name="Submit" value="Submit Data" id="Submit">
</form>
<h2>PHP Output</h2>
<?php
if($_POST['user_input']) {
if($_POST['method'] == "none") {
echo "No XSS Protection<br>";
echo $_POST['user_input'];
} else if($_POST['method'] == "strip") {
echo "Using strip_tags<br>";
echo strip_tags($_POST['user_input']);
} else {
echo "Using htmlspecialchars<br>";
echo htmlspecialchars($_POST['user_input']);
}
}
?>
</body>
</html>