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The trail is part of the Napali Coast State Park owned by the Department of Land and Natural Resources (DLNR).
However, just before reaching mile marker 8 there exists an "unofficial" (i.e. illegal) campsite which is not well known outside of Kalalau trail veterans and locals. Again, it is not legal to camp here. If you are caught you may be fined and required to leave the trail. Obviously, do not setup your tent on the helicopter landing area as that could create a dangerous situation if a helo had to make a night landing.
Of course you need to backpack 11-14 miles out after reaching Kalalau beach. Hiking to Kalalau beach without a permit is illegal and may result in a steep fine (~$1500?) if caught. Plan ahead, be safe, and you'll have one of the best hiking experiences of your life :-)