The only resource which may still be legally collected, under permit, is kitul.    From Wordnik.com.  [Sinharaja Forest Reserve, Sri Lanka] Reference

The traditional use of minor forest products, most important of which are kitul for jaggery and wewal or cane for weaving baskets, is now restricted to forest surrounding the reserve.    From Wordnik.com.  [Sinharaja Forest Reserve, Sri Lanka] Reference