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server.js
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//import modules
const express = require('express');
const bodyParser = require('body-parser');
const app = express();
const port = 3000;
const path = require('path');
const session = require('express-session');
const fs = require('fs');
const sqlite3 = require('sqlite3').verbose();
//init sqlite db
const db = new sqlite3.Database('./mydb.sqlite', (err) => {
if (err) {
console.error(err.message);
} else {
db.run(`
CREATE TABLE IF NOT EXISTS users (
id INTEGER PRIMARY KEY AUTOINCREMENT,
name TEXT,
email TEXT,
password TEXT,
is_admin BOOLEAN
)
`);
//insert admin user
db.get('SELECT * FROM users WHERE is_admin = 1', (err, row) => {
if (!row) {
const adminUser = {
name: 'admin',
email: 'admin@pennington.edu',
password: 'flag{sup3rUs3R}', //no hashing
is_admin: true
};
db.run(`
INSERT OR IGNORE INTO users (name, email, password, is_admin)
VALUES (?, ?, ?, ?)
`, [adminUser.name, adminUser.email, adminUser.password, adminUser.is_admin], (err) => {
if (err) {
console.error(err.message);
} else {
console.log('Admin user ensured in the database');
}
});
}
});
console.log('Connected to the SQLite database.');
}
});
//array to store valid flags
const validFlags = [
'flag{b4byst3Ps}',
'flag{sup3rUs3R}',
'flag{d4taisb3aut1ful}',
'flag{1nt3l}',
'flag{wh0am1}'
];
//middleware setup
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: true }));
app.use(express.static(path.join(__dirname, 'public')));
app.use('/public/files', express.static(path.join(__dirname, 'public', 'files')));
//session
app.use(session({
secret: 'your_secret_key', //hardcoded
resave: false,
saveUninitialized: true,
cookie: { secure: false }
}));
//routes
app.get('/', (req, res) => {
res.sendFile(path.join(__dirname, 'public', 'index.html'));
});
app.post('/validate-flag', (req, res) => {
const submittedFlag = req.query.flag;
console.log('Submitted Flag:', submittedFlag);
if (validFlags.includes(submittedFlag)) {
res.status(200).send('Flag is correct!');
} else {
console.log('Incorrect flag. Please try again.');
res.status(400).send('Incorrect flag. Please try again.');
}
});
//user registration
app.post('/users', (req, res) => {
const { name, email, password } = req.body;
const query = `INSERT INTO users (name, email, password) VALUES (?, ?, ?)`;
db.run(query, [name, email, password], function (err) {
if (err) {
return res.status(500).json({ error: err.message });
}
res.redirect('/files');
});
});
app.post('/login', (req, res) => {
const { email, password } = req.body;
const query = `SELECT * FROM users WHERE email = ? AND password = ?`;
db.get(query, [email, password], (err, user) => {
if (err) {
console.error(err.message);
return res.status(500).send('Error on the server.');
}
if (user) {
req.session.email = user.email;
req.session.userId = user.id;
req.session.is_admin = user.is_admin;
if (user.is_admin) {
res.redirect('/private');
} else {
res.redirect('/files');
}
} else {
res.send(`
<!DOCTYPE html>
<html>
<head>
<title>Login Failed</title>
<link rel="stylesheet" href="/styles.css">
</head>
<body>
<p>Invalid username or password. <a href="/login.html">Try again</a></p>
</body>
</html>
`);
}
});
});
//search function containing sqli
app.get('/users/search', (req, res) => {
res.set({
'Cache-Control': 'no-store',
'Pragma': 'no-cache',
'Expires': '0'
});
const searchQuery = req.query.query;
let sql;
if (searchQuery === "' or 1=1") {
sql = `SELECT * FROM users`;
} else {
sql = `SELECT name, email FROM users WHERE name LIKE '%${searchQuery}%'`;
}
db.all(sql, [], (err, rows) => {
if (err) {
res.status(500).send('Error occurred: ' + err.message);
return;
}
res.json(rows);
});
});
//serve files
app.get('/files', (req, res) => {
if (!req.session.email) {
return res.redirect('/login.html');
}
const baseDirectory = req.session.is_admin ? 'private' : 'public/files';
const directoryPath = path.join(__dirname, baseDirectory);
fs.readdir(directoryPath, (err, files) => {
if (err) {
return res.status(500).send('Unable to scan directory: ' + err);
}
let fileListHtml = files.map(file => `<li><a href="/${baseDirectory}/${file}">${file}</a></li>`).join('');
res.send(`
<!DOCTYPE html>
<html>
<head>
<title>Files</title>
<link rel="stylesheet" href="/styles.css">
</head>
<body>
<ul>${fileListHtml}</ul>
</body>
</html>
`);
});
});
//serve private files
app.get('/private', (req, res) => {
if (!req.session.email || !req.session.is_admin) {
return res.status(403).send('Access Denied');
}
const directoryPath = path.join(__dirname, 'private');
fs.readdir(directoryPath, (err, files) => {
if (err) {
return res.status(500).send('Unable to scan directory: ' + err);
}
let fileListHtml = files.map(file => `<li><a href="/private/${file}">${file}</a></li>`).join('');
res.send(`
<!DOCTYPE html>
<html>
<head>
<title>Files</title>
<link rel="stylesheet" href="/styles.css">
</head>
<body>
<ul>${fileListHtml}</ul>
</body>
</html>
`);
});
});
//serve private files statically
app.use('/private', express.static(path.join(__dirname, 'private')));
app.listen(port, () => {
console.log(`Server running on http://localhost:${port}`);
});