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le-challenge-dns

A dns-based strategy for node-letsencrypt for setting, retrieving, and clearing ACME DNS-01 challenges issued by the ACME server

It creates a subdomain record for _acme-challenge wich challenge to be tested by the ACME server.

_acme-challenge.example.com   TXT   xxxxxxxxxxxxxxxx    TTL 60

• Safe to use with node cluster
• Safe to use with ephemeral services (Heroku, Joyent, etc)

Install

npm install --save le-challenge-dns@2.x

Usage

var leChallengeDns = require('le-challenge-dns').create({
  email: 'john.doe@example.com'
, refreshToken: '...'
, ttl: 60

, debug: false
});

var LE = require('letsencrypt');

LE.create({
  server: LE.stagingServerUrl                               // Change to LE.productionServerUrl in production
, challengeType: 'dns-01'
, challenges: {
    'dns-01': leChallengeDns
  }
, approvedDomains: [ 'example.com' ]
});

NOTE: If you request a certificate with 6 domains listed, it will require 6 individual challenges.

Exposed Methods

For ACME Challenge:

• set(opts, domain, challange, keyAuthorization, done)
• get(defaults, domain, challenge, done)
• remove(defaults, domain, challenge, done)

Note: get() is a no-op for dns-01 and although dns-01 does not use keyAuthorization, it must be passed in as null to keep the correct method signature.

For node-letsencrypt internals:

• getOptions() returns the internal defaults merged with the user-supplied options
• loopback(defaults, domain, challange, keyAuthorization, done) should test, by external means, that the ACME server's challenge server will succeed
• test(opts, domain, challange, keyAuthorization, done) runs set, loopback, remove, loopback