guardly
v1.0.15
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Security helper methods for front-end development
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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); // '<div>Test & "escape"</div>'
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); // '<user><name>John & Doe</name></user>'
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); // '<script>alert("XSS")</script>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.