Civil Procedure Code 1908
83. When aliens may sue.
Alien enemies residing in India with the permission of the Central Government, and alien friends, may sue in any Court otherwise competent to try the suit, as if they were citizens of India, but alien enemies residing in India without such permission, or residing in a foreign country, shall not sue in any such court.
Explanation-Every person residing in a foreign country, the Government of i which is at war with India and carrying on business in that country without a licence in that behalf granted by the Central Government, shall, for the purpose of this section, be deemed to be an alien enemy residing in a foreign country.