acme-dns-01-cli | a Root project

An extremely simple reference implementation of an ACME (Let's Encrypt) dns-01 challenge strategy.

This generic implementation can be adapted to work with any node.js ACME client, although it was built for Greenlock and ACME.js.

_acme-challenge.example.com   TXT   xxxxxxxxxxxxxxxx    TTL 60

• Prints the ACME challenge DNS Host and DNS Key Authorization Digest to the terminal
  • (waits for you to hit enter before continuing)
• Let's you know when the challenge as succeeded or failed, and is safe to remove.

Other ACME Challenge Reference Implementations:

• acme-http-01-cli
• acme-http-01-fs
• acme-dns-01-cli

Install

1npm install --save acme-dns-01-cli@3.x

If you have greenlock@v2.6 or lower, you'll need the old le-challenge-dns@2.x instead.

Usage

1var Greenlock = require('greenlock');
2
3Greenlock.create({
4  ...
5, challenges: { 'http-01': require('acme-http-01-fs')
6              , 'dns-01': require('acme-dns-01-cli').create({ debug: true })
7              , 'tls-alpn-01': require('acme-tls-alpn-01-cli')
8              }
9  ...
10});

You can also switch between different implementations by overwriting the default with the one that you want in approveDomains():

1function approveDomains(opts) {
2  ...
3
4  if (!opts.challenges) { opts.challenges = {}; }
5  opts.challenges['dns-01'] = acmeDns01Cli;
6  opts.challenges['http-01'] = ...
7
8  return Promise.resolve({ ... });
9}

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

Exposed (Promise) Methods

For ACME Challenge:

• set(opts)
• remove(opts)

The dns-01 strategy supports wildcards (whereas http-01 does not).

The options object has whatever options were set in approveDomains() as well as the challenge, which looks like this:

1{ challenge: {
2    identifier: { type: 'dns', value: 'example.com'
3  , wildcard: true
4  , altname: '*.example.com'
5  , type: 'dns-01'
6  , token: 'xxxxxx'
7  , keyAuthorization: 'xxxxxx.abc123'
8  , dnsHost: '_acme-challenge.example.com'
9  , dnsAuthorization: 'xyz567'
10  , expires: '1970-01-01T00:00:00Z'
11  }
12}

For greenlock.js internals:

• options stores the internal defaults merged with the user-supplied options

Optional:

• get(limitedOpts)

Note: Typically there wouldn't be a get() for DNS because the NameServer (not Greenlock) answers the requests. It could be used for testing implementations, but that's about it. (though I suppose you could implement it if you happen to run your DNS and webserver together... kinda weird though)

If there were an implementation of Greenlock integrated directly into a NameServer (which currently there is not), it would probably look like this:

1{ challenge: {
2    type: 'dns-01'
3  , identifier: { type: 'dns', value: 'example.com' }
4  , token: 'abc123'
5  , dnsHost: '_acme-challenge.example.com'
6  }
7}

Legal & Rules of the Road

Greenlock™ and Bluecrypt™ are trademarks of AJ ONeal

The rule of thumb is "attribute, but don't confuse". For example:

Built with Greenlock (a Root project).

Please contact us if you have any questions in regards to our trademark, attribution, and/or visible source policies. We want to build great software and a great community.

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