“Securing a Server
“Two ways you can secure a server are by using TCP wrappers and
by setting up a chroot jail. This section describes both
techniques. TCP Wrappers: Secure a Server (hosts.allow and
hosts.deny)“Follow these guidelines when you open a local system to access
from remote systems:* Open the local system only to systems you want to allow to
access it.* Allow each remote system to access only the data you want it
to access.* Allow each remote system to access data only in the
appropriate manner (readonly, read/write, write only).”