From bbb24aedc3724855fddd027300f43fdf7505234f Mon Sep 17 00:00:00 2001
From: Umar Hansa <umarh@google.com>
Date: Thu, 26 Jan 2023 18:33:01 +0000
Subject: [PATCH] Initial commit

---
 .gitignore                                    |   23 +
 CONTRIBUTING.md                               |   33 +
 LICENSE                                       |  201 ++
 README.md                                     |   30 +
 assets/bank.js                                |   23 +
 attacker-server.js                            |   63 +
 bank-server.js                                |  171 ++
 html/attacker/clickjacking.html               |   60 +
 html/attacker/csrf.html                       |   23 +
 html/bank/bank-home.html                      |   18 +
 html/bank/base.html                           |   50 +
 html/bank/send-money.html                     |   51 +
 html/bank/transactions.html                   |   80 +
 main-server.js                                |   12 +
 .../fake-currency-demo/package-lock.json      |   39 +
 npm-modules/fake-currency-demo/package.json   |   12 +
 npm-modules/fake-currency-demo/src/index.js   |   15 +
 npm-modules/fake-linter-demo/index.js         |   36 +
 .../fake-linter-demo/package-lock.json        |    9 +
 npm-modules/fake-linter-demo/package.json     |    8 +
 package-lock.json                             | 2270 +++++++++++++++++
 package.json                                  |   20 +
 22 files changed, 3247 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 CONTRIBUTING.md
 create mode 100644 LICENSE
 create mode 100644 README.md
 create mode 100644 assets/bank.js
 create mode 100644 attacker-server.js
 create mode 100644 bank-server.js
 create mode 100644 html/attacker/clickjacking.html
 create mode 100644 html/attacker/csrf.html
 create mode 100644 html/bank/bank-home.html
 create mode 100644 html/bank/base.html
 create mode 100644 html/bank/send-money.html
 create mode 100644 html/bank/transactions.html
 create mode 100644 main-server.js
 create mode 100644 npm-modules/fake-currency-demo/package-lock.json
 create mode 100644 npm-modules/fake-currency-demo/package.json
 create mode 100644 npm-modules/fake-currency-demo/src/index.js
 create mode 100755 npm-modules/fake-linter-demo/index.js
 create mode 100644 npm-modules/fake-linter-demo/package-lock.json
 create mode 100644 npm-modules/fake-linter-demo/package.json
 create mode 100644 package-lock.json
 create mode 100644 package.json

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..76c9fa9
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,23 @@
+npm-debug.log
+logs
+*.log
+npm-debug.log*
+pids
+*.pid
+*.seed
+*.pid.lock
+lib-cov
+coverage
+.nyc_output
+.grunt
+.lock-wscript
+build/Release
+node_modules
+jspm_packages
+.npm
+.eslintcache
+.node_repl_history
+*.tgz
+.yarn-integrity
+.DS_Store
+dist/
\ No newline at end of file
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
new file mode 100644
index 0000000..37ae0a4
--- /dev/null
+++ b/CONTRIBUTING.md
@@ -0,0 +1,33 @@
+# How to Contribute
+
+We'd love to accept your patches and contributions to this project.
+
+## Before you begin
+
+### Sign our Contributor License Agreement
+
+Contributions to this project must be accompanied by a
+[Contributor License Agreement](https://cla.developers.google.com/about) (CLA).
+You (or your employer) retain the copyright to your contribution; this simply
+gives us permission to use and redistribute your contributions as part of the
+project.
+
+If you or your current employer have already signed the Google CLA (even if it
+was for a different project), you probably don't need to do it again.
+
+Visit <https://cla.developers.google.com/> to see your current agreements or to
+sign a new one.
+
+### Review our Community Guidelines
+
+This project follows
+[Google's Open Source Community Guidelines](https://opensource.google/conduct/).
+
+## Contribution process
+
+### Code Reviews
+
+All submissions, including submissions by project members, require review. We
+use GitHub pull requests for this purpose. Consult
+[GitHub Help](https://help.github.com/articles/about-pull-requests/) for more
+information on using pull requests.
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..f49a4e1
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,201 @@
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+
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diff --git a/README.md b/README.md
new file mode 100644
index 0000000..e47cbc1
--- /dev/null
+++ b/README.md
@@ -0,0 +1,30 @@
+# Learning web security
+
+This is the code for web security training content.
+
+# Understand different web page rendering types
+
+This repo contains the code for the "Explore website security issues" and "Apply security best practices in your pages" codelabs.
+
+## Getting Started
+
+1. Download this project to your local machine.
+
+2. In your terminal, navigate to the folder containing the project.
+
+```sh
+cd ~/Downloads/web-fundamentals-security-codelab-main
+```
+
+3. Install deps from npm and start the project:
+
+```sh
+npm i
+npm start
+
+# Should output:
+# Bank Server Started: Use: http://localhost:4000
+# Attacker Server Started: Use: http://localhost:8000
+```
+
+4. Visit `http://localhost:3000` in your web browser.
diff --git a/assets/bank.js b/assets/bank.js
new file mode 100644
index 0000000..1a08b1d
--- /dev/null
+++ b/assets/bank.js
@@ -0,0 +1,23 @@
+// Copyright 2022 Google LLC.
+// SPDX-License-Identifier: Apache-2.0
+
+// This module converts 2.00 into $2.00
+import formatCurrency from "/assets/node_modules/fake-currency-demo/dist/index.js";
+
+for (const el of document.querySelectorAll(".amount")) {
+	formatCurrency(el, "USD");
+}
+
+// This function runs when the user clicks 'View' for a transaction message
+async function viewTransaction(event) {
+	event.preventDefault();
+	const { id, type } = event.target.dataset;
+	const url = `/bank/get-transaction-message/${type}/${id}`;
+	const transactionMessageResponse = await fetch(url);
+	const transactionMessage = await transactionMessageResponse.text();
+	event.target.outerHTML = `<span>${transactionMessage}</span>`;
+}
+
+for (const el of document.querySelectorAll(".load-reference-message")) {
+	el.addEventListener("click", viewTransaction);
+}
diff --git a/attacker-server.js b/attacker-server.js
new file mode 100644
index 0000000..4aec174
--- /dev/null
+++ b/attacker-server.js
@@ -0,0 +1,63 @@
+// Copyright 2022 Google LLC.
+// SPDX-License-Identifier: Apache-2.0
+
+import nunjucks from "nunjucks";
+import express from "express";
+
+function attackerServer(port, BANK_SERVER_PORT) {
+	function getPaymentURL(req) {
+		let updatedURL = new URL(
+			req.protocol + "://" + req.get("host") + req.originalUrl
+		);
+
+		if (updatedURL.port && updatedURL.port.length) {
+			updatedURL.port =
+				// When not running on localhost, a hosted service
+				// might be using a different public port
+				process.env.HOSTED_SERVICE_BANK_SERVER_PUBLIC_PORT ||
+				BANK_SERVER_PORT;
+		}
+
+		if (process.env.IS_HTTPS) {
+			updatedURL.protocol = "https:";
+		}
+
+		updatedURL.pathname = "/bank/send";
+		return updatedURL;
+	}
+
+	const app = express();
+	nunjucks.configure("html/attacker", {
+		autoescape: true,
+		express: app,
+		noCache: true,
+	});
+
+	app.get("/", (req, res) => {
+		res.send(`
+			<a href="/csrf">csrf</a> / <a href="/clickjacking">clickjacking</a>
+			`);
+	});
+
+	app.get("/clickjacking", (req, res) => {
+		const paymentURL = getPaymentURL(req);
+		res.render("clickjacking.html", {
+			paymentURL,
+		});
+	});
+
+	app.get("/csrf", (req, res) => {
+		const formURL = getPaymentURL(req);
+
+		res.render("csrf.html", {
+			formURL,
+		});
+	});
+
+	app.listen(port, () => {
+		const message = `Attacker Server Started: Use: http://localhost:${port}`;
+		console.log(message);
+	});
+}
+
+export default attackerServer;
diff --git a/bank-server.js b/bank-server.js
new file mode 100644
index 0000000..60d00ee
--- /dev/null
+++ b/bank-server.js
@@ -0,0 +1,171 @@
+// Copyright 2022 Google LLC.
+// SPDX-License-Identifier: Apache-2.0
+
+import nunjucks from "nunjucks";
+import session from "express-session";
+import catNames from "cat-names";
+import express from "express";
+
+function randomBetween(min, max) {
+	return Math.floor(Math.random() * (max - min + 1) + min);
+}
+
+function loginRequired(req, res, next) {
+	if (req.session.user) {
+		return next();
+	} else {
+		return res.redirect("/bank");
+	}
+}
+
+function bankServer(port) {
+	const defaultReferenceMessage = "From online banking";
+	const app = express();
+
+	app.use("/assets", express.static("assets"));
+	app.use("/assets/node_modules", express.static("node_modules"));
+
+	app.use(express.urlencoded({ extended: false }));
+
+	app.use(
+		session({
+			secret: "abc",
+			resave: true,
+			saveUninitialized: true,
+			// Insert your security fix for cookies below this line ⬇️
+			// 3. Insert your cookie fix here
+			// Add your security fix for cookies above this line ⬆️
+		})
+	);
+
+	app.use((req, res, next) => {
+		res.locals.user = req.session.user;
+		next();
+	});
+
+	app.use((req, res, next) => {
+		// Insert your security fixes for clickjacking and XSS below this line ⬇️
+		// 1. Insert your clickjacking fix here
+		// 2. Insert your XSS fix here
+		// Add your security fixes for clickjacking and XSS above this line ⬆️
+		next();
+	});
+
+	nunjucks.configure("html/bank", {
+		autoescape: true,
+		express: app,
+		noCache: true,
+	});
+
+	app.get("/", (req, res) => {
+		res.redirect("/bank");
+	});
+
+	app.get(
+		"/bank/get-transaction-message/:type/:id",
+		loginRequired,
+		(req, res) => {
+			const id = req.params.id;
+			const type = req.params.type;
+			const { reference } = req.session.user.transactions[type].find(
+				(transaction) => {
+					return transaction.id === parseInt(id);
+				}
+			);
+			return res.send(reference);
+		}
+	);
+
+	app.get("/bank", (req, res) => {
+		res.render("bank-home.html", {
+			title: "Bank home",
+		});
+	});
+
+	app.get("/bank/send", loginRequired, (req, res) => {
+		res.render("send-money.html", {
+			title: "Send money",
+			exampleFriend: catNames.random(),
+			defaultReference: defaultReferenceMessage,
+		});
+	});
+
+	app.get("/bank/transactions", loginRequired, (req, res) => {
+		res.render("transactions.html", {
+			title: "Transactions",
+			transactions: req.session.user.transactions,
+		});
+	});
+
+	app.post("/bank/send", loginRequired, (req, res) => {
+		const name = req.body.name;
+		const referenceMessage = req.body.reference;
+		const amountToSend = parseInt(req.body.amount);
+
+		if (!amountToSend || !Number.isInteger(amountToSend)) {
+			return res.redirect("/bank");
+		}
+
+		req.session.user.transactions.moneyOut.push({
+			id: req.session.user.transactions.moneyOut.length + 1,
+			name,
+			amount: amountToSend,
+			reference: referenceMessage,
+		});
+
+		const balance = req.session.user.balance;
+
+		req.session.user.balance = balance - amountToSend;
+		return res.redirect("/bank");
+	});
+
+	app.get("/bank/login", (req, res) => {
+		if (req.session.user) {
+			return res.redirect("/bank");
+		}
+
+		const maliciousMoney = `fetch('/bank/send',{headers:{'content-type':'application/x-www-form-urlencoded'},body:'name=Attacker&amount=4&reference=Via+XSS+⚠️',method:'POST'});`;
+
+		const xss = `Fake message</span><img src="nope" onerror="alert('XSS successful!');${maliciousMoney}" />`;
+
+		req.session.user = {
+			balance: randomBetween(8, 60),
+			name: catNames.random(),
+			transactions: {
+				moneyIn: [
+					{
+						id: 1,
+						name: "Friend",
+						amount: 3,
+						reference: defaultReferenceMessage,
+					},
+					{
+						id: 2,
+						name: "Attacker",
+						amount: 1,
+						reference: xss,
+					},
+				],
+				moneyOut: [],
+			},
+		};
+
+		return res.redirect("/bank");
+	});
+
+	app.get("/bank/logout", (req, res) => {
+		req.session.user = undefined;
+		return res.redirect("/bank");
+	});
+
+	// Add your fix for an information disclosure vulnerability below this line ⬇️
+	// 4. Insert your information disclosure fix here...
+	// Add your fix for an information disclosure vulnerability above this line ⬆️
+
+	app.listen(port, () => {
+		const message = `Bank Server Started: Use: http://localhost:${port}`;
+		console.log(message);
+	});
+}
+
+export default bankServer;
diff --git a/html/attacker/clickjacking.html b/html/attacker/clickjacking.html
new file mode 100644
index 0000000..5f73e2a
--- /dev/null
+++ b/html/attacker/clickjacking.html
@@ -0,0 +1,60 @@
+<!-- Copyright 2022 Google LLC.
+SPDX-License-Identifier: Apache-2.0 -->
+
+<!DOCTYPE html>
+<html>
+	<head>
+		<meta charset="utf-8" />
+		<meta name="viewport" content="width=device-width" />
+		<title>⚠️ Clickjacking demo - Attacker</title>
+		<style type="text/css">
+			iframe {
+				outline: 4px solid blue;
+				opacity: 0.2;
+				filter: blur(3px);
+				position: absolute;
+				z-index: 1;
+				margin-top: 30px;
+				transition: 1s all;
+				transform: scale(0.9);
+			}
+
+			button {
+				cursor: pointer;
+				padding: 15px;
+				position: absolute;
+				left: 40px;
+				top: 620px;
+				outline: 2px solid red;
+				background-color: cornflowerblue;
+				font-weight: bold;
+				font-size: 18px;
+				margin-top: 30px;
+			}
+
+			body:has(#checkbox:checked) iframe {
+				transform: scale(0.8);
+				filter: unset;
+				opacity: unset;
+			}
+
+			form label {
+				cursor: pointer;
+			}
+		</style>
+	</head>
+	<body>
+		<iframe
+			src="{{paymentURL}}"
+			height="700"
+			width="700"
+			scrolling="no"
+		></iframe>
+
+		<button>Click to get a prize!</button>
+		<form>
+			<input type="checkbox" id="checkbox" />
+			<label for="checkbox">Help me visualize the iframe website</label>
+		</form>
+	</body>
+</html>
diff --git a/html/attacker/csrf.html b/html/attacker/csrf.html
new file mode 100644
index 0000000..6a98561
--- /dev/null
+++ b/html/attacker/csrf.html
@@ -0,0 +1,23 @@
+<!-- Copyright 2022 Google LLC.
+SPDX-License-Identifier: Apache-2.0 -->
+
+<!DOCTYPE html>
+<html>
+	<head>
+		<meta charset="utf-8" />
+		<meta name="viewport" content="width=device-width" />
+		<title>⚠️ CSRF demo - Attacker</title>
+	</head>
+	<body>
+		<form action="{{formURL}}" method="post">
+			<input type="text" name="name" value="Attacker" />
+
+			<input type="number" name="amount" value="2" />
+			<input type="text" name="reference" value="Via CSRF ⚠️" />
+			<button type="submit">Submit</button>
+		</form>
+		<script type="text/javascript">
+			// document.querySelector("form").submit();
+		</script>
+	</body>
+</html>
diff --git a/html/bank/bank-home.html b/html/bank/bank-home.html
new file mode 100644
index 0000000..99b9e9e
--- /dev/null
+++ b/html/bank/bank-home.html
@@ -0,0 +1,18 @@
+<!-- Copyright 2022 Google LLC.
+SPDX-License-Identifier: Apache-2.0 -->
+
+{% extends 'base.html' %} {% block title %}{% endblock %} {% block content %}
+
+<h1>Bank Home Page</h1>
+
+{% if user %}
+<p>Welcome {{user.name}}, you are logged in!</p>
+<p>Your balance is <span class="amount">{{user.balance}}</span>.</p>
+
+{% else %}
+<p>
+	<a href="/bank/login">Login!</a>
+	<span>(No username or password needed for this demo)</span>
+</p>
+
+{% endif %} {% endblock %}
diff --git a/html/bank/base.html b/html/bank/base.html
new file mode 100644
index 0000000..4c57d34
--- /dev/null
+++ b/html/bank/base.html
@@ -0,0 +1,50 @@
+<!-- Copyright 2022 Google LLC.
+SPDX-License-Identifier: Apache-2.0 -->
+
+<!DOCTYPE html>
+<html lang="en">
+	<head>
+		<meta charset="utf-8" />
+		<title>{{ title }}</title>
+		<link href="https://hawkz.github.io/gdcss/gd.css" rel="stylesheet" />
+		<meta
+			name="viewport"
+			content="width=device-width, initial-scale=1.0, viewport-fit=cover"
+		/>
+		<script defer type="module" src="/assets/bank.js"></script>
+	</head>
+
+	<body>
+		<header>
+			<nav>
+				<a href="/bank">Home</a>
+
+				<ul>
+					{% if user %}
+					<li>
+						Your balance:
+						<span class="amount">{{user.balance}}</span>
+					</li>
+					<li>
+						<a href="/bank/transactions">Transactions</a>
+					</li>
+					<li>
+						<a href="/bank/send">Send money</a>
+					</li>
+					<li><a href="/bank/logout">Logout</a></li>
+					{% else %}
+					<li><a href="/bank/login">Login</a></li>
+					{% endif %}
+				</ul>
+			</nav>
+		</header>
+
+		<main id="main-content">{% block content %}{% endblock %}</main>
+
+		<footer>
+			<article>
+				<p>This is a demo</p>
+			</article>
+		</footer>
+	</body>
+</html>
diff --git a/html/bank/send-money.html b/html/bank/send-money.html
new file mode 100644
index 0000000..79bbfaf
--- /dev/null
+++ b/html/bank/send-money.html
@@ -0,0 +1,51 @@
+<!-- Copyright 2022 Google LLC.
+SPDX-License-Identifier: Apache-2.0 -->
+
+{% extends 'base.html' %} {% block title %}{% endblock %} {% block content %}
+
+<h1>Send money</h1>
+<p>Your balance is <span class="amount">{{user.balance}}</span>.</p>
+
+<form action="/bank/send" method="post">
+	<fieldset>
+		<legend>Send money</legend>
+		<p>
+			<label for="name"
+				>Send to (used as an example, you don't need to change
+				this)</label
+			>
+			<input type="text" required name="name" value="{{exampleFriend}}" />
+		</p>
+		<p>
+			<label for="amount"
+				>Amount (you have
+				<span class="amount">{{user.balance}}</span> available):
+			</label>
+			<input
+				type="number"
+				name="amount"
+				required
+				min="1"
+				max="{{user.balance}}"
+				value="1"
+			/>
+		</p>
+
+		<p>
+			<label for="reference">Reference (don't change this): </label>
+			<input
+				type="text"
+				name="reference"
+				id="reference"
+				required
+				value="{{defaultReference}}"
+				readonly
+			/>
+		</p>
+
+		<p>
+			<button type="submit" id="submit">Submit Button</button>
+		</p>
+	</fieldset>
+</form>
+{% endblock %}
diff --git a/html/bank/transactions.html b/html/bank/transactions.html
new file mode 100644
index 0000000..16aa0d2
--- /dev/null
+++ b/html/bank/transactions.html
@@ -0,0 +1,80 @@
+<!-- Copyright 2022 Google LLC.
+SPDX-License-Identifier: Apache-2.0 -->
+
+{% extends 'base.html' %} {% block title %}{% endblock %} {% block content %}
+
+<p>Your balance is <span class="amount">{{user.balance}}</span>.</p>
+
+{% if transactions.moneyOut.length %}
+
+<h1>Money Out</h1>
+
+<table>
+	<caption>
+		Money Out Transactions
+	</caption>
+	<thead>
+		<tr>
+			<th>Recipient</th>
+			<th>Amount</th>
+			<th>Reference</th>
+		</tr>
+	</thead>
+	<tbody>
+		{% for item in transactions.moneyOut %}
+		<tr>
+			<td>{{item.name}}</td>
+			<td><span class="amount">{{item.amount}}</span></td>
+			<td>
+				<button
+					data-id="{{item.id}}"
+					data-type="moneyOut"
+					class="load-reference-message"
+				>
+					View
+				</button>
+			</td>
+		</tr>
+
+		{% endfor %}
+	</tbody>
+</table>
+
+{% endif %} {% if transactions.moneyIn.length %}
+
+<h1>Money In</h1>
+
+<table>
+	<caption>
+		Money In Transactions
+	</caption>
+	<thead>
+		<tr>
+			<th>Sender</th>
+			<th>Amount</th>
+			<th>Reference</th>
+		</tr>
+	</thead>
+	<tbody>
+		{% for item in transactions.moneyIn %}
+		<tr>
+			<td>{{item.name}}</td>
+			<td>
+				<span class="amount"> {{item.amount}}</span>
+			</td>
+			<td>
+				<button
+					class="load-reference-message"
+					data-type="moneyIn"
+					data-id="{{item.id}}"
+				>
+					View
+				</button>
+			</td>
+		</tr>
+
+		{% endfor %}
+	</tbody>
+</table>
+
+{% endif %} {% endblock %}
diff --git a/main-server.js b/main-server.js
new file mode 100644
index 0000000..08accbc
--- /dev/null
+++ b/main-server.js
@@ -0,0 +1,12 @@
+// Copyright 2022 Google LLC.
+// SPDX-License-Identifier: Apache-2.0
+
+import { resolve } from "path";
+import bankServer from "./bank-server.js";
+import attackerServer from "./attacker-server.js";
+
+const BANK_SERVER_PORT = 4000;
+const ATTACKER_SERVER_PORT = 8000;
+
+bankServer(BANK_SERVER_PORT);
+attackerServer(ATTACKER_SERVER_PORT, BANK_SERVER_PORT);
diff --git a/npm-modules/fake-currency-demo/package-lock.json b/npm-modules/fake-currency-demo/package-lock.json
new file mode 100644
index 0000000..559c031
--- /dev/null
+++ b/npm-modules/fake-currency-demo/package-lock.json
@@ -0,0 +1,39 @@
+{
+  "name": "fake-currency-demo",
+  "version": "1.0.1",
+  "lockfileVersion": 2,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "fake-currency-demo",
+      "version": "1.0.1",
+      "license": "ISC",
+      "dependencies": {
+        "fake-linter-demo": "^1.0.0"
+      }
+    },
+    "../fake-linter-demo": {
+      "version": "1.0.0",
+      "extraneous": true,
+      "license": "ISC",
+      "bin": {
+        "fake-linter-demo": "index.js"
+      }
+    },
+    "node_modules/fake-linter-demo": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/fake-linter-demo/-/fake-linter-demo-1.0.0.tgz",
+      "integrity": "sha512-KG6vvwe1CFcmB0AszLB5AEbZOyStVNXc1f5gGTWehw5mqruiJg1BJJqD36tMkq6Q/Nsfbm7XyTFkZDZ2O4QV1Q==",
+      "bin": {
+        "fake-linter-demo": "index.js"
+      }
+    }
+  },
+  "dependencies": {
+    "fake-linter-demo": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/fake-linter-demo/-/fake-linter-demo-1.0.0.tgz",
+      "integrity": "sha512-KG6vvwe1CFcmB0AszLB5AEbZOyStVNXc1f5gGTWehw5mqruiJg1BJJqD36tMkq6Q/Nsfbm7XyTFkZDZ2O4QV1Q=="
+    }
+  }
+}
diff --git a/npm-modules/fake-currency-demo/package.json b/npm-modules/fake-currency-demo/package.json
new file mode 100644
index 0000000..e1f231d
--- /dev/null
+++ b/npm-modules/fake-currency-demo/package.json
@@ -0,0 +1,12 @@
+{
+  "name": "fake-currency-demo",
+  "version": "1.0.2",
+  "main": "dist/index.js",
+  "license": "Apache-2.0",
+  "scripts": {
+    "check-and-publish": "fake-linter-demo src/index.js dist/index.js && npm publish"
+  },
+  "dependencies": {
+    "fake-linter-demo": "^1.0.0"
+  }
+}
diff --git a/npm-modules/fake-currency-demo/src/index.js b/npm-modules/fake-currency-demo/src/index.js
new file mode 100644
index 0000000..3de1c90
--- /dev/null
+++ b/npm-modules/fake-currency-demo/src/index.js
@@ -0,0 +1,15 @@
+// Copyright 2022 Google LLC.
+// SPDX-License-Identifier: Apache-2.0
+
+function main(amountEl, currency) {
+	const originalAmount = parseInt(amountEl.textContent);
+
+	const formattedAmount = new Intl.NumberFormat("en-US", {
+		style: "currency",
+		currency,
+	}).format(originalAmount);
+
+	amountEl.textContent = formattedAmount;
+}
+
+export default main;
diff --git a/npm-modules/fake-linter-demo/index.js b/npm-modules/fake-linter-demo/index.js
new file mode 100755
index 0000000..ce67755
--- /dev/null
+++ b/npm-modules/fake-linter-demo/index.js
@@ -0,0 +1,36 @@
+#!/usr/bin/env node
+
+// Copyright 2022 Google LLC.
+// SPDX-License-Identifier: Apache-2.0
+
+import { resolve } from "path";
+import { argv, cwd } from "node:process";
+import { readFile, writeFile } from "node:fs/promises";
+
+const baseDirectory = cwd();
+const inputFileName = argv.at(2);
+const outputFileName = argv.at(3);
+
+if (
+	!inputFileName ||
+	inputFileName.length < 1 ||
+	!outputFileName ||
+	outputFileName.length < 1
+) {
+	throw new Error("Invalid filename(s) specified");
+}
+
+const inputFile = resolve(baseDirectory, inputFileName);
+const outputFile = resolve(baseDirectory, outputFileName);
+
+let contents = await readFile(inputFile, "utf8");
+
+contents = contents.replace(
+	"export default main;",
+	`console.log('This has been sneakily inserted!');\nexport default main;`
+);
+
+await writeFile(outputFile, contents);
+
+console.log("✅ The linting has passed");
+console.log("✅ Your file is ready to publish!");
diff --git a/npm-modules/fake-linter-demo/package-lock.json b/npm-modules/fake-linter-demo/package-lock.json
new file mode 100644
index 0000000..964b286
--- /dev/null
+++ b/npm-modules/fake-linter-demo/package-lock.json
@@ -0,0 +1,9 @@
+{
+  "name": "fake-linter-demo",
+  "version": "1.0.0",
+  "lockfileVersion": 2,
+  "requires": true,
+  "bin": {
+    "fake-linter-demo": "index.js"
+  }
+}
diff --git a/npm-modules/fake-linter-demo/package.json b/npm-modules/fake-linter-demo/package.json
new file mode 100644
index 0000000..0364fbf
--- /dev/null
+++ b/npm-modules/fake-linter-demo/package.json
@@ -0,0 +1,8 @@
+{
+  "name": "fake-linter-demo",
+  "version": "1.0.1",
+  "main": "index.js",
+  "license": "Apache-2.0",
+  "type": "module",
+  "bin": "index.js"
+}
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..b335c93
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,2270 @@
+{
+  "name": "web-security-codelab",
+  "version": "1.0.0",
+  "lockfileVersion": 2,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "web-security-codelab",
+      "version": "1.0.0",
+      "license": "Apache-2.0",
+      "dependencies": {
+        "cat-names": "^3.1.0",
+        "express": "^4.18.2",
+        "express-session": "^1.17.3",
+        "fake-currency-demo": "^1.0.2",
+        "nunjucks": "^3.2.3"
+      }
+    },
+    "node_modules/@babel/code-frame": {
+      "version": "7.18.6",
+      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.18.6.tgz",
+      "integrity": "sha512-TDCmlK5eOvH+eH7cdAFlNXeVJqWIQ7gW9tY1GJIpUtFb6CmjVyq2VM3u71bOyR8CRihcCgMUYoDNyLXao3+70Q==",
+      "dependencies": {
+        "@babel/highlight": "^7.18.6"
+      },
+      "engines": {
+        "node": ">=6.9.0"
+      }
+    },
+    "node_modules/@babel/helper-validator-identifier": {
+      "version": "7.19.1",
+      "resolved": "https://registry.npmjs.org/@babel/helper-validator-identifier/-/helper-validator-identifier-7.19.1.tgz",
+      "integrity": "sha512-awrNfaMtnHUr653GgGEs++LlAvW6w+DcPrOliSMXWCKo597CwL5Acf/wWdNkf/tfEQE3mjkeD1YOVZOUV/od1w==",
+      "engines": {
+        "node": ">=6.9.0"
+      }
+    },
+    "node_modules/@babel/highlight": {
+      "version": "7.18.6",
+      "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.18.6.tgz",
+      "integrity": "sha512-u7stbOuYjaPezCuLj29hNW1v64M2Md2qupEKP1fHc7WdOA3DgLh37suiSrZYY7haUB7iBeQZ9P1uiRF359do3g==",
+      "dependencies": {
+        "@babel/helper-validator-identifier": "^7.18.6",
+        "chalk": "^2.0.0",
+        "js-tokens": "^4.0.0"
+      },
+      "engines": {
+        "node": ">=6.9.0"
+      }
+    },
+    "node_modules/@types/minimist": {
+      "version": "1.2.2",
+      "resolved": "https://registry.npmjs.org/@types/minimist/-/minimist-1.2.2.tgz",
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+    },
+    "node_modules/@types/normalize-package-data": {
+      "version": "2.4.1",
+      "resolved": "https://registry.npmjs.org/@types/normalize-package-data/-/normalize-package-data-2.4.1.tgz",
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+    },
+    "node_modules/a-sync-waterfall": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/a-sync-waterfall/-/a-sync-waterfall-1.0.1.tgz",
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+    },
+    "node_modules/accepts": {
+      "version": "1.3.8",
+      "resolved": "https://registry.npmjs.org/accepts/-/accepts-1.3.8.tgz",
+      "integrity": "sha512-PYAthTa2m2VKxuvSD3DPC/Gy+U+sOA1LAuT8mkmRuvw+NACSaeXEQ+NHcVF7rONl6qcaxV3Uuemwawk+7+SJLw==",
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+        "negotiator": "0.6.3"
+      },
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+      }
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+    },
+    "node_modules/body-parser": {
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+      "resolved": "https://registry.npmjs.org/body-parser/-/body-parser-1.20.1.tgz",
+      "integrity": "sha512-jWi7abTbYwajOytWCQc37VulmWiRae5RyTpaCyDcS5/lMdtwSz5lOpDE67srw/HYe35f1z3fDQw+3txg7gNtWw==",
+      "dependencies": {
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+        "content-type": "~1.0.4",
+        "debug": "2.6.9",
+        "depd": "2.0.0",
+        "destroy": "1.2.0",
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+        "on-finished": "2.4.1",
+        "qs": "6.11.0",
+        "raw-body": "2.5.1",
+        "type-is": "~1.6.18",
+        "unpipe": "1.0.0"
+      },
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+        "npm": "1.2.8000 || >= 1.4.16"
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+      "engines": {
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+      }
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+      "dependencies": {
+        "function-bind": "^1.1.1",
+        "get-intrinsic": "^1.0.2"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
+      }
+    },
+    "node_modules/camelcase": {
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+      "engines": {
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+      }
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diff --git a/package.json b/package.json
new file mode 100644
index 0000000..7170460
--- /dev/null
+++ b/package.json
@@ -0,0 +1,20 @@
+{
+  "name": "web-security-codelab",
+  "version": "1.0.0",
+  "private": true,
+  "description": "Code for the web fundamentals security training codelab",
+  "license": "Apache-2.0",
+  "main": "main-server.js",
+  "type": "module",
+  "scripts": {
+    "start": "node main-server.js",
+    "dev": "node --watch main-server.js"
+  },
+  "dependencies": {
+    "cat-names": "^3.1.0",
+    "express": "^4.18.2",
+    "express-session": "^1.17.3",
+    "fake-currency-demo": "^1.0.2",
+    "nunjucks": "^3.2.3"
+  }
+}