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class Acme::Client::SelfSignCertificate
attr_reader :private_key, :subject_alt_names, :not_before, :not_after
extend Forwardable
def_delegators :certificate, :to_pem, :to_der
def initialize(subject_alt_names:, not_before: default_not_before, not_after: default_not_after, private_key: generate_private_key)
@private_key = private_key
@subject_alt_names = subject_alt_names
@not_before = not_before
@not_after = not_after
end
def certificate
@certificate ||= begin
certificate = generate_certificate
extension_factory = generate_extension_factory(certificate)
subject_alt_name_entry = subject_alt_names.map { |d| "DNS: #{d}" }.join(',')
subject_alt_name_extension = extension_factory.create_extension('subjectAltName', subject_alt_name_entry)
certificate.add_extension(subject_alt_name_extension)
certificate.sign(private_key, digest)
end
end
private
def generate_private_key
OpenSSL::PKey::RSA.new(2048)
end
def default_not_before
Time.now - 3600
end
def default_not_after
Time.now + 30 * 24 * 3600
end
def digest
OpenSSL::Digest::SHA256.new
end
def generate_certificate
certificate = OpenSSL::X509::Certificate.new
certificate.not_before = not_before
certificate.not_after = not_after
certificate.public_key = private_key.public_key
certificate.version = 2
certificate
end
def generate_extension_factory(certificate)
extension_factory = OpenSSL::X509::ExtensionFactory.new
extension_factory.subject_certificate = certificate
extension_factory.issuer_certificate = certificate
extension_factory
end
end
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