December 2002
Intermediate to advanced
192 pages
5h 30m
English
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OS Protection
A secure kernel and properly configured network interfaces are only part of configuring a secure station. There are various parts of the operating system that you must secure to protect yourself from attackers. This includes configuring a host-based firewall, removing unneeded services being started at boot time, and setting static ARP entries to avoid ARP spoofing attacks.
Firewall Configuration
A
firewall configuration on a wireless client is generally
straightforward. Almost all connections will be outbound from the
host. Unless you are running externally accessible services such as a
web or ssh server, there should never be a
connection attempt from outside hosts.
The firewall configuration is stored in
/etc/pf.conf. The file contains directives that
will be passed to the packet filter at boot time.
Here is an simple pf.conf that should work on
most client installations. If you require a more advanced firewall
setup or would like a more complete discussion of
pf, see Section 13.2 in Chapter 13 or read the pf.conf
manual page.
# Simple client pf.conf oif = "wi0" onet = "192.168.0.0" omask = "255.255.255.0" oip = "192.168.0.248" # block by default block in log all # Let loopback traffic through pass out quick on lo0 all pass in quick on lo0 all # keep windows hosts from filling your logs block in quick on $oif proto tcp from any to any port 136 >< 140 # keep broadcasts from filling your logs block in quick on $oif inet from any to { 255.255.255.255, 192.168.0.255 } ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.