class Net::SSH::Authentication::Methods::Hostbased

def authenticate_with(identity, next_service, username, key_manager)
  debug { "trying hostbased (#{identity.fingerprint})" }
  client_username = ENV['USER'] || username
  req = build_request(identity, next_service, username, "#{hostname}.", client_username)
  sig_data = Buffer.from(:string, session_id, :raw, req)
  sig = key_manager.sign(identity, sig_data.to_s)
  message = Buffer.from(:raw, req, :string, sig)
  send_message(message)
  message = session.next_message
  case message.type
    when USERAUTH_SUCCESS
      info { "hostbased succeeded (#{identity.fingerprint})" }
      return true
    when USERAUTH_FAILURE
      info { "hostbased failed (#{identity.fingerprint})" }
      raise Net::SSH::Authentication::DisallowedMethod unless
        message[:authentications].split(/,/).include? 'hostbased'
      return false
    else
      raise Net::SSH::Exception, "unexpected server response to USERAUTH_REQUEST: #{message.type} (#{message.inspect})"
  end
end