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@weizman/shield

v0.0.1

Published

Shield your DOM against clobbering attacks effortlessly

Downloads

11

Vulnerabilities

Powered byPowered by Snyk
  • 0High
  • 0Medium
  • 0Low

Links

Git

Maintainers

weizmanweizman

Keywords

Readme

Shield JS 🛡

Shield (npm) is a tiny JavaScript shim/library that applies protection against DOM Clobbering attacks at runtime with close to zero integration friction.

See for yourself - visit live demo/playground

Installation

Include Shield via a script tag:

<script src="https://cdn.jsdelivr.net/npm/@weizman/shield/shield.min.js"></script>

That's it.

It's best to include it as close as possible to the beginning of the <head> (the earliest it runs, the better it protects).

Usage

Shield supports optional configuration:

<script src="https://cdn.jsdelivr.net/npm/@weizman/shield/shield.min.js"
        allowlist="id1,id2"
        reportOnly="false"
        reportTo="https://report-server/report/"
></script>
  • allowlist - a list of ids you allow to be clobbered into the DOM (shield will overlook them when applying its protection).
  • reportOnly - whether to report forbidden access attempt or to throw an error. If enabled, reportTo must also be provided.
  • reportTo - a valid https: URL to report forbidden access attempt to in case reportOnly is enabled (CSP format):
{
    "csp-report": {
        "blocked-property": "id3",
        "disposition": "report",
        "document-uri": "https://my-app.com/some-route/",
        "effective-directive": "dom-clobbering",
        "original-policy": "no-access",
        "referrer": "https://my-app.com/some-route/",
        "violated-directive": "dom-clobbering"
    }
}

Result

Shield will collect the values of all id/name properties that were introduced to DOM at runtime and will redefine them on the window to throw an error when JavaScript code attempts to access them.

That's because while we use id/name attributes for our DOM nodes, we don't expect JavaScript code to access them, so when this happens it can only be done by a malicious entity - and that's what Shield blocks:

Unless the id/name was explicitly provided via the allowlist argument, which in that case Shield will allow JavaScript to access it:

Making Shield a very simple and elegant solution that requires you to do nothing but include the script in your app - shield will do the rest!

About