acme-client is a client implementation of the ACME protocol in Ruby.
You can find the ACME reference implementations of the server in Go and the client in Python.
ACME is part of the Letsencrypt project, which goal is to provide free SSL/TLS certificates with automation of the acquiring and renewal process.
# We're going to need a private key.
require 'openssl'
private_key = OpenSSL::PKey::RSA.new(4096)
# We need an ACME server to talk to, see github.com/letsencrypt/boulder
# WARNING: This endpoint is the production endpoint, which is rate limited and will produce valid certificates.
# You should probably use the staging endpoint for all your experimentation:
# endpoint = 'https://acme-staging.api.letsencrypt.org/'
endpoint = 'https://acme-v01.api.letsencrypt.org/'
# Initialize the client
require 'acme/client'
client = Acme::Client.new(private_key: private_key, endpoint: endpoint)
# If the private key is not known to the server, we need to register it for the first time.
registration = client.register(contact: 'mailto:contact@example.com')
# You may need to agree to the terms of service (that's up the to the server to require it or not but boulder does by default)
registration.agree_terms
# Let's try to optain a certificate for example.org
# We need to prove that we control the domain using one of the challenges method.
authorization = client.authorize(domain: 'example.org')
# This example is using the http-01 challenge type.
challenge = authorization.http01
# The http-01 method will require you to respond to an HTTP request.
# You can retrieve the expected path for the file.
challenge.filename # => ".well-known/acme-challenge/:some_token"
# You can generate the body of the expected response.
challenge.file_content # => 'string token and JWK thumbprint'
# You are not required to send a Content-Type. This method will return the right Content-Type should you decide to include one.
challenge.content_type
# Save the file. We'll create a public directory to serve it from, and inside it we'll create the challenge file.
FileUtils.mkdir_p( File.join( 'public', File.dirname( challenge.filename ) ) )
# We'll write the content of the file
File.write( File.join( 'public', challenge.filename), challenge.file_content )
# Optionally save the challenge for use at another time (eg: by a background job processor)
File.write('challenge', challenge.to_h.to_json)
# The challenge file can be served with a Ruby webserver.
# You can run a webserver in another console for that purpose. You may need to forward ports on your router.
#ruby -run -e httpd public -p 8080 --bind-address 0.0.0.0
# Load a saved challenge. This is only required if you need to reuse a saved challenge as outlined above.
challenge = client.challenge_from_hash(JSON.parse(File.read('challenge')))
# Once you are ready to serve the confirmation request you can proceed.
challenge.request_verification # => true
challenge.verify_status # => 'pending'
# Wait a bit for the server to make the request, or just blink, it should be fast.
sleep(1)
challenge.verify_status # => 'valid'
# We're going to need a certificate signing request. If not explicitly
# specified, the first name listed becomes the common name.
csr = Acme::Client::CertificateRequest.new(names: %w[example.org www.example.org])
# We can now request a certificate, you can pass anything that returns
# a valid DER encoded CSR when calling to_der on it, for example a
# OpenSSL::X509::Request should work too.
certificate = client.new_certificate(csr) # => #<Acme::Client::Certificate ....>
# Save the certificate and the private key to files
File.write("privkey.pem", certificate.request.private_key.to_pem)
File.write("cert.pem", certificate.to_pem)
File.write("chain.pem", certificate.chain_to_pem)
File.write("fullchain.pem", certificate.fullchain_to_pem)
# Start a webserver, using your shiny new certificate
# ruby -r openssl -r webrick -r 'webrick/https' -e "s = WEBrick::HTTPServer.new(
# :Port => 8443,
# :DocumentRoot => Dir.pwd,
# :SSLEnable => true,
# :SSLPrivateKey => OpenSSL::PKey::RSA.new( File.read('privkey.pem') ),
# :SSLCertificate => OpenSSL::X509::Certificate.new( File.read('cert.pem') )); trap('INT') { s.shutdown }; s.start"- Recovery methods are not implemented.
- proofOfPossession-01 is not implemented.
Ruby >= 2.1
All the tests use VCR to mock the interaction with the server but if you
need to record new interation against the server simply clone boulder and
run it normally with ./start.py.
Yes.