I too played Moria a lot in my youth. You need to get your hands on some
source code and compile it yourself I guess.
The Roguebasin Moria page and the official page are good starting points:
http://roguebasin.roguelikedevelopment.org/index.php?title=Moria
http://www-math.bgsu.edu/~grabine/moria.html
I am however a bit concerned as I was unable to reach the FTP. I have an
UMoria source package in my roguelike archive, but I'm not sure what is
required to get it to compile on Linux.
http://www.roguelikedevelopment.org/archive/files/sourcecode/mor552cs.zip
BTW, I just noticed that the FAQ lists two FTP mirrors, at least one of
them is working:
ftp://ftp.funet.fi/pub/unix/games/moria/source/
BR,
Björn