this article in The Dawn. The landmark case in question is Sh. Liaquat Hussain v. Federation of Pakistan, PLD 1999 SC 504, excerpts from which appear here and here. According to The Dawn:
In a petition filed before the apex court on Saturday, regular litigant and [political party] Awami Himayat Tehreek Chairman Maulvi Iqbal Haider has asked the court to empower the government – in view of the prevailing circumstances – to make laws or promulgate ordinances to establish military courts in order to help civil authorities curb terrorism and militancy.
The petitioner argued that there was nothing in Articles 4 through 25 of the constitution – which relate to fundamental rights – that prohibits the setting up of military courts to try terrorists, if it helped the government to protect its citizens.It would appear that a constitutional crisis is brewing as fallout of the Peshawar school massacre.