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Like many things with Mac OS X, configuring the built-in firewalli is a frequently frustrating combination of the “standard” way of doing things (usually owing from the *nix roots of many open source projects) and “the Apple way” (owing to the decision to make things simple to use for the widest set of users). The point of this guide is to modify ipfw rules so that you can, for example,
prohibit connections originating from outside the campus (that is, deny connections outside 171.64.0.0/14). That’s what we’ll be doing here—but with some knowledge of ipfw rule constructioniii, you can get very fine-grained with your firewall. The unique ways of ipfw on Mac OS X client With Mac OS X 10.4 client, ipfw is normally configured using the Sharing PreferencePane in System Preferences. The interface is exceptionally simplified and limited, though. For example, the GUI lacks both the option to restrict
outgoing traffic, as well as to specify hostnames or IP ranges, both which you can do easily with Mac OS X Server and the Server Admin tool. Setting up services, initial rules We want ipfw to be kicked off normally with some initial, basic and universal rules, to which we’ll later load our own service-related ones written out in a separate file. Closing the open ports using the GUI Once you have rebooted and logged in, go to System Preferences Sharing Firewall and actually turn off the previously grayed-out (but enabled) services. This will have the effect of telling Mac OS X to turn on ipfw at startup, even though you have no ports open or configured.
Tags : ipfw rules, mac os x server, open source projects, mac os x, open ports, initial rules, ip ranges, universal rules, outgoing traffic, x client, configuration guide, system preferences, server admin, os x, many things
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