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#!/usr/bin/ruby
require 'yaml'
require 'openssl'
require 'acme-client'
require 'dnsruby'
require 'time'
def read_config( path = 'config.yaml' )
p "Reading config from #{path}"
begin
config = YAML.load_file( path )
rescue Psych::SyntaxError
$stderr.puts "Parsing configfile failed: " + $!.to_s
raise
rescue Errno::ENOENT
$stderr.puts "IO failed: " + $!.to_s
raise
end
return config
end
def read_account_key( path = 'pkey.pem' )
p "Reading account key from #{path}"
if File.readable?( path )
p "File #{path} is readable, trying to parse"
privatekey_string = File.read( path )
private_key = OpenSSL::PKey::EC.new( privatekey_string )
else
if File.exists?( path )
raise( "The file #{path} exists but is not readable. Make it readable or specify different path" )
else
p "File #{path} does not exist, trying to create"
private_key = OpenSSL::PKey::EC.generate( "prime256v1" )
File.write( path, private_key.private_to_pem )
end
end
return private_key
end
def read_cert_key( domain )
folder = "./certs/#{domain}/"
path = "#{folder}/current.key"
p "Reading cert key from #{path}"
if File.readable?( path )
p "File #{path} is readable, trying to parse"
privatekey_string = File.read( path )
private_key = OpenSSL::PKey::EC.new( privatekey_string )
else
if File.exists?( path )
raise( "The file #{path} exists but is not readable. Make it readable or specify different path" )
else
p "File #{path} does not exist, trying to create"
private_key = OpenSSL::PKey::EC.generate( "prime256v1" )
pkey_file = File.new( folder + Time.now.to_i.to_s + ".key", 'w' )
pkey_file.write( private_key.private_to_pem )
File.symlink( File.basename( pkey_file ), File.dirname( pkey_file ) + "/current.key" )
end
end
return private_key
end
def deploy_dns01_challenge_token( domain, challenge, nameserver, config )
p 'Creating DNS UPDATE packet'
update = Dnsruby::Update.new( domain )
# TODO: delete challenge token record after validation
update.delete( challenge.record_name + "." + domain, challenge.record_type )
update.add( challenge.record_name + "." + domain, challenge.record_type, 10, challenge.record_content )
p 'Creating object for contacting nameserver'
res = Dnsruby::Resolver.new( nameserver )
res.dnssec = false
p 'Looking up TSIG parameters'
tsig_name = config['domains'][domain]['tsig_key']
tsig_key = config['tsig_keys'][tsig_name]['key']
tsig_alg = config['tsig_keys'][tsig_name]['algorithm']
p 'Creating TSIG object'
tsig = Dnsruby::RR.create(
{
name: tsig_name,
type: 'TSIG',
key: tsig_key,
algorithm: tsig_alg,
}
)
p 'Signing DNS UPDATE packet with TSIG object'
tsig.apply(update)
p 'Sending UPDATE to nameserver'
response = res.send_message(update)
end
def wait_for_challenge_propagation( domain, challenge )
p 'Creating recursor object for checking challenge propagation'
rec = Dnsruby::Recursor.new
p "Getting NS records for #{domain}"
domain_auth_ns = rec.query_no_validation_or_recursion( domain, "NS" )
p 'Checking challenge status on all NS'
domain_auth_ns.answer.each do |ns|
nameserver = ns.rdata.to_s
p "Creating resolver object for checking propagation on #{nameserver}"
res = Dnsruby::Resolver.new( nameserver )
res.dnssec = false
res.do_caching = false
begin
p 'Querying ACME challenge record'
result = res.query_no_validation_or_recursion( "_acme-challenge." + domain, "TXT" )
p result
propagated = result.answer.any? do |answer|
answer.rdata[0] == challenge.record_content
end
unless propagated
p 'Not yet propagated, sleeping before checking again'
sleep(1)
end
end until propagated
end
end
def wait_for_challenge_validation( challenge )
p 'Requesting validation of challenge'
challenge.request_validation
while challenge.status == 'pending'
p 'Sleeping because challenge validation is pending'
sleep(1)
p 'Checking again'
challenge.reload
end
end
def get_cert( order, domains, domain_key )
path = "./certs/#{domains[0]}/"
crt_file = "#{path}/cert.pem"
p 'Creating CSR object'
csr = Acme::Client::CertificateRequest.new(
private_key: domain_key,
names: domains,
subject: { common_name: "#{domains[0]}" }
)
p 'Finalize cert order'
order.finalize(csr: csr)
while order.status == 'processing'
p 'Sleep while order is processing'
sleep(1)
p 'Rechecking order status'
order.reload
end
cert = order.certificate
p 'Writing cert'
cert_file = File.new( path + Time.now.to_i.to_s + ".crt", 'w' )
cert_file.write( cert )
if File.symlink?( File.dirname( cert_file ) + "/current.crt" )
File.unlink( File.dirname( cert_file ) + "/current.crt" )
File.symlink( File.basename( cert_file ), File.dirname( cert_file ) + "/current.crt" )
else
raise StandardError
end
return cert
end
config = read_config
# iterate over configured certs
# TODO: make this one thread per cert
config['certs'].each_pair do |cert_name, cert_opts|
p "Finding CA to use for cert #{cert_name}"
acme_directory_url = config['CAs'][cert_opts['ca']['name']]['directory_url']
p "Finding account to use for cert #{cert_name} from CA #{cert_opts['ca']['name']}"
account = config['ca_accounts'][cert_opts['ca']['account']]
email = account['email']
private_key = read_account_key( account['keyfile'] )
p 'Creating client object for communication with CA'
client = Acme::Client.new( private_key: private_key, directory: acme_directory_url )
client.new_account(contact: "mailto:#{email}", terms_of_service_agreed: true)
p "Creating order object for cert #{cert_name}"
order = client.new_order(identifiers: cert_opts['domain_names'] )
if order.status != 'ready'
p 'Order is not ready, we need to authorize first'
p 'Iterating over required authorizations'
order.authorizations.each do |auth|
p "Processing authorization for #{auth.domain}"
p "Finding challenge type for #{auth.domain}"
challenge = auth.dns01
deploy_dns01_challenge_token( auth.domain, challenge, config['domains'][auth.domain]['primary_ns'], config )
wait_for_challenge_propagation( auth.domain, challenge )
wait_for_challenge_validation( challenge )
end
else
p 'Order is ready, we don’t need to authorize'
end
domain_key = read_cert_key( cert_opts['domain_names'][0] )
get_cert( order, cert_opts['domain_names'], domain_key )
end
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