Setting store SSL cert/private key file permissions for a Node.js REST API

Introduction

In this article, we will discuss how to set proper permissions for SSL certificate and private key files when working on a Node.js REST API. We assume that you have already set up your server and are in the process of implementing SSL encryption.

Reading SSL Files in Node.js

To read SSL files in Node.js, we can use the built-in fs module and its readFileSync() method. However, it is crucial to ensure that these files have the correct permissions before attempting to read them.

Setting Permissions for SSL Files

Before reading SSL files, we need to set the correct permissions using the chmod command. For example, to set read, write, and execute permissions for the owner and read permissions for the group and others for a file named key.pem, we can use the following command:

sudo chmod 644 key.pem

For a directory named certs, we can use the following command:

sudo chmod 755 certs

Reading SSL Files in Code

Now that we have set the correct permissions for our SSL files, we can read them in our Node.js code using the fs module and its readFileSync() method:

const fs = require('fs');
 const privateKey = fs.readFileSync('key.pem', 'utf8');
 const certificate = fs.readFileSync('cert.pem', 'utf8');
 const ca = fs.readFileSync('ca.pem', 'utf8');

Creating HTTPS Server

With our SSL files read in, we can now create an HTTPS server using the Node.js built-in https module:

const https = require('https');
 const options = {
 key: privateKey,
 cert: certificate,
 ca: ca,
 };
 const server = https.createServer(options, (req, res) => {
 // Handle request here
 });
 server.listen(3000);

Summary

• Set proper permissions for SSL certificate and private key files using the chmod command.
• Read SSL files in Node.js using the fs module and its readFileSync() method.
• Create an HTTPS server using the Node.js built-in https module.

References

• Node.js fs Module
• Node.js https Module