Cfengine is a useful tool for implementing, monitoring and maintaining
firewalls. You can control what programs are supposed to be on the
firewall and what programs are not supposed to be there. You can control
file permissions, processes and a dozen other things which make up the
configuration of a bastion host.
By referencing important programs against a read only medium you
can not only monitor host integrity but always be certain that
you are never more than a cfengine execution away from correctness.
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