@ghaiklor/x509 NPM

node-x509

Simple X509 certificate parser. This fork provides a compatibility with Node.js versions later than 10. The original library seems like stopped being supported.

node-x509

Installation

From NPM (recommended):

npm install @ghaiklor/x509

Building and testing from source:

npm install
npm test

Usage

Reading from a file:

const x509 = require('@ghaiklor/x509');
const issuer = x509.getIssuer(__dirname + '/certs/your.crt');

Reading from a string:

const fs = require('fs');
const x509 = require('@ghaiklor/x509');
const issuer = x509.getIssuer(fs.readFileSync('./certs/your.crt').toString());

Methods

Notes:

cert may be a filename or a raw base64 encoded PEM string in any of these methods.

x509.getAltNames(`cert`)

Parse certificate with x509.parseCert and return the alternate names.

const x509 = require('@ghaiklor/x509');
const altNames = x509.getAltNames(__dirname + '/certs/nodejitsu.com.crt');
// altNames = [ '*.nodejitsu.com', 'nodejitsu.com' ]

x509.getIssuer(`cert`)

Parse certificate with x509.parseCert and return the issuer.

const x509 = require('@ghaiklor/x509');
const issuer = x509.getIssuer(__dirname + '/certs/nodejitsu.com.crt');
// issuer = {
//   countryName: 'GB',
//   stateOrProvinceName: 'Greater Manchester',
//   localityName: 'Salford',
//   organizationName: 'COMODO CA Limited',
//   commonName: 'COMODO High-Assurance Secure Server CA'
// }

x509.getSubject(`cert`)

Parse certificate with x509.parseCert and return the subject.

const x509 = require('@ghaiklor/x509');
const subject = x509.getSubject(__dirname + '/certs/nodejitsu.com.crt');
// subject = {
//   countryName: 'US',
//   postalCode: '10010',
//   stateOrProvinceName: 'NY',
//   localityName: 'New York',
//   streetAddress: '902 Broadway, 4th Floor',
//   organizationName: 'Nodejitsu',
//   organizationalUnitName: 'PremiumSSL Wildcard',
//   commonName: '*.nodejitsu.com'
// }

x509.parseCert(`cert`)

Parse subject, issuer, valid before and after date, and alternate names from certificate.

const x509 = require('@ghaiklor/x509');
const cert = x509.parseCert(__dirname + '/certs/nodejitsu.com.crt');
// cert = {
//   subject: {
//     countryName: 'US',
//     postalCode: '10010',
//     stateOrProvinceName: 'NY',
//     localityName: 'New York',
//     streetAddress: '902 Broadway, 4th Floor',
//     organizationName: 'Nodejitsu',
//     organizationalUnitName: 'PremiumSSL Wildcard',
//     commonName: '*.nodejitsu.com'
//   },
//   issuer: {
//     countryName: 'GB',
//     stateOrProvinceName: 'Greater Manchester',
//     localityName: 'Salford',
//     organizationName: 'COMODO CA Limited',
//     commonName: 'COMODO High-Assurance Secure Server CA'
//   },
//   notBefore: Sun Oct 28 2012 20:00:00 GMT-0400 (EDT),
//   notAfter: Wed Nov 26 2014 18:59:59 GMT-0500 (EST),
//   altNames: [ '*.nodejitsu.com', 'nodejitsu.com' ],
//   signatureAlgorithm: 'sha1WithRSAEncryption',
//   fingerPrint: 'E4:7E:24:8E:86:D2:BE:55:C0:4D:41:A1:C2:0E:06:96:56:B9:8E:EC',
//   publicKey: {
//     algorithm: 'rsaEncryption',
//     e: '65537',
//     n: '.......'
//   }
// }

x509.verify(`cert`, `CABundlePath`, function(err, result){ /.../})

Performs basic certificate validation against a bundle of ca certificates.

It accepts an error-first callback as first argument. If the error is null, then the certificate is valid.

The error messages are the same returned by openssl: x509_verify_cert_error_string

Note: As now, this function only accepts absolute paths to existing files as arguments.

const x509 = require('@ghaiklor/x509');

x509.verify(
  __dirname + '/certs/user.com.crt',
  __dirname + 'end-user-example.com.chain',
  function(err, result) { /*...*/ }
);

Examples

Checking the date to make sure the certificate is active:

const x509 = require('@ghaiklor/x509');
const cert = x509.parseCert('your_cert.crt');
const date = new Date();

if (cert.notBefore > date) {
  // Certificate isn't active yet.
}

if (cert.notAfter < date) {
  // Certificate has expired.
}