class Net::SSH::Authentication::Methods::Password

def ask_password(username)
  host = session.transport.host
  prompt_info = { type: 'password', user: username, host: host }
  if @prompt_info != prompt_info
    @prompt_info = prompt_info
    @prompter = prompt.start(prompt_info)
  end
  echo = false
  @prompter.ask("#{username}@#{host}'s password:", echo)
end

def authenticate(next_service, username, password = nil)
  clear_prompter!
  retries = 0
  max_retries = get_max_retries
  return false if !password && max_retries == 0
  begin
    password_to_send = password || ask_password(username)
    send_message(userauth_request(username, next_service, "password", false, password_to_send))
    message = session.next_message
    retries += 1
    if message.type == USERAUTH_FAILURE
      debug { "password failed" }
      raise Net::SSH::Authentication::DisallowedMethod unless
        message[:authentications].split(/,/).include? 'password'
      password = nil
    end
  end until (message.type != USERAUTH_FAILURE || retries >= max_retries)
  case message.type
  when USERAUTH_SUCCESS
    debug { "password succeeded" }
    @prompter.success if @prompter
    return true
  when USERAUTH_FAILURE
    return false
  when USERAUTH_PASSWD_CHANGEREQ
    debug { "password change request received, failing" }
    return false
  else
    raise Net::SSH::Exception, "unexpected reply to USERAUTH_REQUEST: #{message.type} (#{message.inspect})"
  end
end

def clear_prompter!
  @prompt_info = nil
  @prompter = nil
end

def get_max_retries
  options = session.transport.options || {}
  result = options[:number_of_password_prompts] || NUMBER_OF_PASSWORD_PROMPTS
  options[:non_interactive] ? 0 : result
end