Guardly

Guardly is a JavaScript/TypeScript library that provides a suite of security helper methods designed to enhance the security of web applications. It includes methods for preventing common web vulnerabilities such as XSS, CSRF, SQL Injection, LDAP Injection, HTTP Parameter Pollution, and more.

Features

• XSS Prevention: Escape and sanitise HTML input.
• CSRF Prevention: Generate and set CSRF tokens.
• HTTPS Enforcement: Ensure HTTPS protocol usage.
• SSL/TLS Validation: Validate SSL/TLS configurations.
• CSP Setting: Set Content-Security-Policy meta tags.
• Command Injection Prevention: Validate allowed commands.
• SQL Injection Prevention: Escape SQL special characters.
• LDAP Injection Prevention: Escape LDAP special characters.
• HTTP Verb Tampering Prevention: Validate HTTP methods.
• Header Injection Prevention: sanitise headers.
• XML Injection Prevention: sanitise XML input.
• SRI for CDN: Add Subresource Integrity (SRI) to CDN scripts.
• HTTP Parameter Pollution Prevention: sanitise URL parameters.
• Input Validation: Validate and sanitise user inputs.

Installation

Install Guardly via npm:

npm install guardly

Run

See the RUNBOOK file for details.

Usage

---

Import the library into your project:

const {
    validateCommand,
    generateCSRFToken,
    escapeHTML,
    escapeSQL,
    enforceHTTPS,
    validateSSLCertificate,
    addSRItoCDNScript,
    setCSP,
    isValidInput,
    sanitiseInput,
    escapeLDAP,
    sanitiseParameters,
    validateHTTPMethod,
    sanitiseHeader,
    sanitiseXML,
    setCSRFToken,
    sanitiseHTML
} = require('guardly');

Examples

---

XSS Prevention

const input = '<div>Test & "escape"</div>';
const escapedOutput = escapeHTML(input); // '&lt;div&gt;Test &amp; &quot;escape&quot;&lt;/div&gt;'

const htmlInput = '<script>alert("XSS")</script><div>Safe</div>';
const sanitisedOutput = sanitiseHTML(htmlInput); // '<div>Safe</div>'

CSRF Prevention

const token = generateCSRFToken();
console.log(token); // Outputs a 24 character token

document.body.innerHTML = '<form id="form"><input type="hidden" name="_csrf" value=""></form>';
const form = document.getElementById('form');
setCSRFToken(form); // Sets the CSRF token in the form and in the cookie

HTTPS Enforcement

enforceHTTPS(); // Redirects to HTTPS if the current protocol is HTTP

SSL/TLS Validation

const url = 'https://example.com';
validateSSLCertificate(url); // Validates SSL/TLS configuration for the provided URL

CSP Setting

setCSP({
    'default-src': "'self'",
    'script-src': "'self' https://trusted.cdn.com",
    'style-src': "'self' https://trusted.styles.com",
    'img-src': "'self' https://trusted.images.com"
});
// Sets a Content-Security-Policy meta tag

Command Injection Prevention

const allowedCommands = ["ls", "ping", "whoami"];
const command = "ls -la";
const isValid = validateCommand(command, allowedCommands); // true

SQL Injection Prevention

const userInput = "' OR '1'='1";
const escapedInput = escapeSQL(userInput); // "\\' OR \\'1\\'=\\'1"

LDAP Injection Prevention

const ldapInput = 'admin*()\\|';
const escapedLDAPInput = escapeLDAP(ldapInput); // 'admin\\2a\\28\\29\\5c\\7c'

HTTP Verb Tampering Prevention

const allowedMethods = ["GET", "POST", "PUT", "DELETE"];
const method = "POST";
const isMethodValid = validateHTTPMethod(method, allowedMethods); // true

Header Injection Prevention

const header = "Content-Type: text/html\r\nContent-Length: 0";
const sanitisedHeader = sanitiseHeader(header); // 'Content-Type: text/htmlContent-Length: 0'

XML Injection Prevention

const xmlInput = '<user><name>John & Doe</name></user>';
const sanitisedXML = sanitiseXML(xmlInput); // '&lt;user&gt;&lt;name&gt;John &amp; Doe&lt;/name&gt;&lt;/user&gt;'

SRI for CDN

addSRItoCDNScript('https://cdn.example.com/library.js', 'sha384-oqVuAfXRKap7fdgcCY5uykM6+R9GqQ8K/ux5J3t3PEaNYCpAnG5P1FZCOm/S6Sni');
// Adds a script tag with SRI attributes to the document head

HTTP Parameter Pollution Prevention

const params = new URLSearchParams("id=123&id=456");
const sanitisedParams = sanitiseParameters(params);
console.log(sanitisedParams.toString()); // 'id=123'

Input Validation

const userInput = '<script>alert("XSS")</script>Hello';
const sanitised = sanitiseInput(userInput);
console.log(sanitised); // '&lt;script&gt;alert("XSS")&lt;/script&gt;Hello'

const safeInput = 'Hello, World!';
const unsafeInput = '<script>alert("XSS")</script>';
console.log(isValidInput(safeInput)); // true
console.log(isValidInput(unsafeInput)); // false

Running Tests

To run the tests for Guardly, use the following command:

npm test

License

This project is licensed under the MIT License - see the LICENSE file for details.

guardly