acme-dns-01-test | a Root project

An ACME dns-01 test harness for Let's Encrypt integrations.

This was specificially designed for ACME.js and Greenlock.js, but will be generically useful to any ACME module.

Passing the tests is very easy. There are just four functions to implement:

• zones() - list domain zones (i.e. example.co.uk, example.com)
• set() - set a TXT record in a zone (i.e. _acme-challenge.foo in example.com)
• get() - confirm that the record was set
• remove() - clean up after the ACME challenge passes

The tests account for single-domain certificates (example.com) as well as multiple domain certs (SAN / AltName), wildcards (*.example.com), and valid private / localhost certificates. No worries on your end, just pass the tests. 👌

Node v6 Support: Please build community plugins using node v6 / vanillajs to ensure that all acme.js and greenlock.js users are fully supported.

Install

npm install --save-dev acme-dns-01-test@3.x

Usage

var tester = require('acme-dns-01-test');

//var challenger = require('acme-dns-01-cli').create({});
var challenger = require('./YOUR-CHALLENGE-STRATEGY').create({
	YOUR_TOKEN_OPTION: 'SOME_API_KEY'
});

// The dry-run tests can pass on, literally, 'example.com'
// but the integration tests require that you have control over the domain
var zone = 'example.com';

tester.testZone('dns-01', zone, challenger).then(function() {
	console.info('PASS');
});

Note: If the service you are testing only handles individual records (not multiple records in a zone), you can use testRecord instead:

var record = 'foo.example.com';

tester.testRecord('dns-01', record, challenger).then(function() {
	console.info('PASS');
});

Reference Implementations

These are plugins that use the v2.7+ (v3) API, and pass this test harness, which you should use as a model for any plugins that you create.

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

You can find other implementations by searching npm for acme-http-01- and acme-dns-01-.

If you are building a plugin, please let us know. We may like to co-author and help maintain and promote your module.

Example

See example.js (it works).

Starter Template

Here's what you could start with.

var tester = require('acme-dns-01-test');

// The dry-run tests can pass on, literally, 'example.com'
// but the integration tests require that you have control over the domain
var zone = 'example.com';

tester
	.testZone('dns-01', zone, {
		// Should return an array of zone domain name strings
		// (APIs that don't implement zones, such as DuckDNS, should return an empty array)
		zones: function(opts) {
			console.log('dnsHosts:', opts.dnsHosts);
			throw new Error('_zone not implemented');
		},

		// Should set a TXT record for dnsHost with dnsAuthorization and ttl || 300
		set: function(opts) {
			console.log('set opts:', opts);
			throw new Error('set not implemented');
		},

		// Should remove the *one* TXT record for dnsHost with dnsAuthorization
		// Should NOT remove otherrecords for dnsHost (wildcard shares dnsHost with
		// non-wildcard)
		remove: function(opts) {
			console.log('remove opts:', opts);
			throw new Error('remove not implemented');
		},

		// Should get the record via the DNS server's API
		// (Note: gets different options than set or remove)
		get: function(opts) {
			console.log('get opts:', opts);
			throw new Error('get not implemented');
		}
	})
	.then(function() {
		console.info('PASS');
	});

dns-01 vs http-01

For type dns-01:

// `dnsHost` is the domain/subdomain/host
// `dnsAuthorization` is the value of the TXT record
// `dnsPrefix` is the record-only part, if `zones()` is implemented
// `dnsZone` is the zone-only part, if `zones()` is implemented

For type http-01:

// `altname` is the name of the domain
// `token` is the name of the file ( .well-known/acme-challenge/`token` )
// `keyAuthorization` is the contents of the file

See acme-http-01-test.js.

Detailed Overview

Here's a quick pseudo stub-out of what a test-passing plugin object might look like:

tester
	.testZone('dns-01', 'example.com', {
		zones: function(opts) {
			// { dnsHosts: [
			//     '_acme-challenge.foo.example.com',
			//     '_acme-challenge.bar.example.com'
			//  ] }

			return YourApi(
				'GET',
				// Most Domain Zone apis don't have a search or filter option,
				// but `opts` includes list of dnsHosts is provided just in case.
				'https://exampledns.com/api/dns/zones?search=' + opts.dnsHosts.join(',')
			).then(function(result) {
				return result.zones.map(function(zone) {
					return zone.name;
				});
			});
		},

		set: function(opts) {
			var ch = opts.challenge;
			// { type: 'dns-01'
			// , identifier: { type: 'dns', value: 'foo.example.com' }
			// , wildcard: false
			// , dnsHost: '_acme-challenge.foo.example.com'
			// , dnsPrefix: '_acme-challenge.foo'
			// , dnsZone: 'example.com'
			// , dnsAuthorization: 'zzzz' }

			return YourApi(
				'POST',
				'https://exampledns.com/api/dns/txt/' + ch.dnsZone + '/' + ch.dnsPrefix,
				{ value: ch.dnsAuthorization }
			);
		},

		get: function(query) {
			var ch = query.challenge;
			// { type: 'dns-01'
			// , identifier: { type: 'dns', value: 'foo.example.com' }
			// , altname: '...'
			// , dnsHost: '...'
			// , wildcard: false }
			// Note: query.identifier.value is different for http-01 than for dns-01
			//       because of how a DNS query is different from an HTTP request

			return YourApi(
				'GET',
				'https://exampledns.com/api/dns/txt/' + ch.dnsZone + '/' + ch.dnsPrefix
			).then(function(secret) {
				return { dnsAuthorization: secret };
			});
		},

		remove: function(opts) {
			var ch = opts.challenge;
			// same options as in `set()` (which are not the same as `get()`

			return YourApi(
				'DELETE',
				'https://exampledns.com/api/dns/txt/' + ch.dnsZone + '/' + ch.dnsPrefix
			);
		}
	})
	.then(function() {
		console.info('PASS');
	});

Where YourApi might look something like this:

var YourApi = function createApi(config) {
	var request = require('@root/request');
	request = require('util').promisify(request);

	return function(method, url, body) {
		return request({
			method: method,
			url: url,
			json: body || true,
			headers: {
				Authorization: 'Bearer ' + config.apiToken
			}
		}).then(function(resp) {
			return resp.body;
		});
	};
};

Two notes:

Note 1:

The API.get(), API.set(), and API.remove() is where you do your magic up to upload a file to the correct location on an http serever, set DNS records, or add the appropriate data to the database that handles such things.

Note 2:

• When altname is foo.example.com the dnsHost will be _acme-challenge.foo.example.com
• When altname is *.foo.example.com the dnsHost will still be _acme-challenge.foo.example.com!!
• When altname is bar.foo.example.com the dnsHost will be _acme-challenge.bar.foo.example.com