How does the CSRF-Token verification process work in PHP and what steps should be taken to ensure its proper functionality within an iframe?

When dealing with CSRF-Token verification in PHP within an iframe, it is important to ensure that the token is passed correctly between the parent and child frames. One way to achieve this is by setting the token in a session variable on the server side and passing it to the child frame through a hidden input field. The child frame can then retrieve the token from the hidden input field and include it in any form submissions to the server for verification. 

// Parent frame
session_start();
$_SESSION['csrf_token'] = bin2hex(random_bytes(32));
?>

<iframe src="child_frame.php"></iframe>

// Child frame (child_frame.php)
session_start();
$csrf_token = $_SESSION['csrf_token'];
?>

<form action="submit_form.php" method="post">
    <input type="hidden" name="csrf_token" value="<?php echo $csrf_token; ?>">
    <!-- Other form fields -->
    <input type="submit" value="Submit">
</form>

// Server-side validation (submit_form.php)
session_start();
if ($_POST['csrf_token'] !== $_SESSION['csrf_token']) {
    // CSRF token verification failed
    die('CSRF token validation failed');
} else {
    // Proceed with form submission
    // Additional form validation and processing
}

Keywords

CSRF-Token verification process PHP iframe functionality

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