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acme-v2.js

A framework for building Let's Encrypt v2 (ACME draft 11) clients, successor to le-acme-core.js. Built by request.

Looking for Quick 'n' Easy™?

If you're looking for an ACME-enabled webserver, try goldilocks.js. If you're looking to build a webserver, try greenlock.js.

• greenlock.js
• goldilocks.js

How to build ACME clients

As this is intended to build ACME clients, there is not a simple 2-line example.

I'd recommend first running the example CLI client with a test domain and then investigating the files used for that example:

node examples/cli.js

The example cli has the following prompts:

What web address(es) would you like to get certificates for? (ex: example.com,*.example.com)
What challenge will you be testing today? http-01 or dns-01? [http-01]
What email should we use? (optional)
What API style would you like to test? v1-compat or promise? [v1-compat]

Put the string 'mBfh0SqaAV3MOK3B6cAhCbIReAyDuwuxlO1Sl70x6bM.VNAzCR4THe4czVzo9piNn73B1ZXRLaB2CESwJfKkvRM' into a file at 'example.com/.well-known/acme-challenge/mBfh0SqaAV3MOK3B6cAhCbIReAyDuwuxlO1Sl70x6bM'

echo 'mBfh0SqaAV3MOK3B6cAhCbIReAyDuwuxlO1Sl70x6bM.VNAzCR4THe4czVzo9piNn73B1ZXRLaB2CESwJfKkvRM' > 'example.com/.well-known/acme-challenge/mBfh0SqaAV3MOK3B6cAhCbIReAyDuwuxlO1Sl70x6bM'

Then hit the 'any' key to continue...

When you've completed the challenge you can hit a key to continue the process.

If you place the certificate you receive back in tests/fullchain.pem you can then test it with examples/https-server.js.

examples/cli.js
examples/genkeypair.js
tests/compat.js
examples/https-server.js
examples/http-server.js

Let's Encrypt Directory URLs

# Production URL
https://acme-v02.api.letsencrypt.org/directory

# Staging URL
https://acme-staging-v02.api.letsencrypt.org/directory

Two API versions, Two Implementations

This library (acme-v2.js) supports ACME draft 11, otherwise known as Let's Encrypt v2 (or v02).

• ACME draft 11
• Let's Encrypt v2
• Let's Encrypt v02

The predecessor (le-acme-core) supports Let's Encrypt v1 (or v01), which was a hodge-podge of various drafts of the ACME spec early on.

• ACME early draft
• Let's Encrypt v1
• Let's Encrypt v01

This library maintains compatibility with le-acme-core so that it can be used as a drop-in replacement and requires no changes to existing code, but also provides an updated API more congruent with draft 11.

le-acme-core-compatible API (recommended)

Status: Stable, Locked, Bugfix-only

See Full Documentation at https://git.coolaj86.com/coolaj86/le-acme-core.js

var RSA = require('rsa-compat').RSA;
var acme = require('acme-v2/compat.js').ACME.create({ RSA: RSA });

//
// Use exactly the same as le-acme-core
//

Promise API (dev)

Status: Almost stable, but not semver locked

This API is a simple evolution of le-acme-core, but tries to provide a better mapping to the new draft 11 APIs.

// Create Instance (Dependency Injection)
var ACME = require('acme-v2').ACME.create({
  RSA: require('rsa-compat').RSA

  // other overrides
, request: require('request')
, promisify: require('util').promisify

  // used for constructing user-agent
, os: require('os')
, process: require('process')

  // used for overriding the default user-agent
, userAgent: 'My custom UA String'
, getUserAgentString: function (deps) { return 'My custom UA String'; }

  // don't try to validate challenges locally
, skipChallengeTest: false
});


// Discover Directory URLs
ACME.init(acmeDirectoryUrl)                   // returns Promise<acmeUrls={keyChange,meta,newAccount,newNonce,newOrder,revokeCert}>


// Accounts
ACME.accounts.create(options)                 // returns Promise<regr> registration data

    { email: '<email>'                        //    valid email (server checks MX records)
    , accountKeypair: {                       //    privateKeyPem or privateKeyJwt
        privateKeyPem: '<ASCII PEM>'
      }
    , agreeToTerms: fn (tosUrl) {}            //    returns Promise with tosUrl
    }


// Registration
ACME.certificates.create(options)             // returns Promise<pems={ privkey (key), cert, chain (ca) }>

    { newAuthzUrl: '<url>'                    //    specify acmeUrls.newAuthz
    , newCertUrl: '<url>'                     //    specify acmeUrls.newCert

    , domainKeypair: {
        privateKeyPem: '<ASCII PEM>'
      }
    , accountKeypair: {
        privateKeyPem: '<ASCII PEM>'
      }
    , domains: [ 'example.com' ]

    , setChallenge: fn (hostname, key, val)   // return Promise
    , removeChallenge: fn (hostname, key)     // return Promise
    }

Helpers & Stuff

// Constants
ACME.challengePrefixes['http-01']             // '/.well-known/acme-challenge'
ACME.challengePrefixes['dns-01']              // '_acme-challenge'

Todo

• support ECDSA keys
• Apr 5, 2018 - appears that sometimes 'pending' status cannot be progressed to 'processing' nor 'deactivated'
  • this may be a bug in the staging API as it appears it cannot be cancelled either, but returns success status code

Changelog

• v1.0.3
  • documentation cleanup
• v1.0.2
  • use options.contact to provide raw contact array
  • made options.email optional
  • file cleanup
• v1.0.1
  • Compat API is ready for use
  • Eliminate debug logging
• Apr 10, 2018 - tested backwards-compatibility using greenlock.js
• Apr 5, 2018 - export http and dns challenge tests
• Apr 5, 2018 - test http and dns challenges (success and failure)
• Apr 5, 2018 - test subdomains and its wildcard
• Apr 5, 2018 - test two subdomains
• Apr 5, 2018 - test wildcard
• Apr 5, 2018 - completely match api for acme v1 (le-acme-core.js)
• Mar 21, 2018 - mostly matches le-acme-core.js API
• Mar 21, 2018 - can now accept values (not hard coded)
• Mar 20, 2018 - SUCCESS - got a test certificate (hard-coded)
• Mar 20, 2018 - download certificate
• Mar 20, 2018 - poll for status
• Mar 20, 2018 - finalize order (submit csr)
• Mar 20, 2018 - generate domain keypair
• Mar 20, 2018 - respond to challenges
• Mar 16, 2018 - get challenges
• Mar 16, 2018 - new order
• Mar 15, 2018 - create account
• Mar 15, 2018 - generate account keypair
• Mar 15, 2018 - get nonce
• Mar 15, 2018 - get directory