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- PF on Mac OS X
- Mac OS X pf firewall: Avoiding known bad guys - ikawnoclastic thoughts
- Loading the ETOpen Ruleset
The Application Firewall's rule of allowing all incoming incoming traffics to the OpenSSH server offers no defense against brute force attack. Leaving the ssh port open on the internet, the server will get thousands of brute force login attempts each day. PF provides an elegant solution to this problem. Over time, the table bruteforce will be filled by overload rules and its size will grow incrementally, taking up more memory.
We can expire table entries using pfctl.Democratizations: Comparisons, Confrontations, and Contrasts">Democratizations: Comparisons, Confrontations, and Contrasts
PF on Mac OS X
For example, this command will remove bruteforce table entries which have not been referenced for a day seconds:. To automate the process, let's create a timed job using launchd that runs the above command once per day . If one takes that route, one must disable the Application Firewall. Only one ruleset will get loaded at last and become effective; but which one wins will probably be indeterministic or at least could be a surprise.
I choose the approach described in this article, because:. Jump to: Retrieved from " https: Navigation menu Personal tools Log in. Namespaces Page Discussion.
Mac OS X pf firewall: Avoiding known bad guys - ikawnoclastic thoughts
Views Read View source View history. This page was last modified on 10 March , at You should: You must understand a few basic things: Fragment of pf. M K 9, 1 24 Like, for example: Pro Backup Pro Backup 2, 4 28 What do the last two lines exactly mean? The last 2 lines are the IP addresses network ranges in this case that the group consists of. But these look like local IP addresses, not like addresses from europe?
The IP addresses are just an anonymised example, replace them with your own ranges. For ranges, you might want to look them up at countryipblocks. Sign up or log in Sign up using Google. This means that WaterRoof is quite safe because it does not install any strange kernel extension or background daemon.
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You can also download and check WaterRoof source code, it's open. WaterRoof can be used to learn how ipfw works: English documentation included. Source code available at my Web site.
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Loading the ETOpen Ruleset
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