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Old 12th November 2010
pico pico is offline
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Default pf pptp

I wondered if someone could help with a little pf file (openbsd 4.4).

I have a ipless bridge on the wan side of my pfsense box at home and have the following rules set for letting everthing though. This way I can have sniff with tcpdump to see passing traffic.

ext_if="fxp0"
int_if="fxp1"

#Bridge so only filter on one interface let all pass on ext_if

pass in quick on $ext_if all
pass out quick on $ext_if all

pass in all
pass out all

------

The pfsense box is running a pptp server and I thought this pf bridge may be able to restrict pptp traffic to only allow certain external ip addresses into the network.

I would if someone could advise as to the syntax required for doing so.

The pfsense box does have the ability to disable automatically created vpn rules box I would like to learn from a file / command line basis as the openbsd box will probably end up replacing my pfsense box in the end. It's a long way off but pf is great.

So to sum up from the pf example above I would like to allow all apart from vpn coming in from specific ip addresses.

Any help would be appreciated.

-----

Failing that is there a way to stop someone trying to brute force the pptp login? Whilst still allowing all other traffic to flow through.

Regards

P

Last edited by pico; 12th November 2010 at 10:17 AM.
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Old 12th November 2010
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jggimi jggimi is offline
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OpenBSD 4.4 has not been supported for more than a year. The current release is 4.8.

--

Because there have been many changes to PF between 4.4 and 4.8, the PF User's Guide available online from the OpenBSD Project website does not have the same exact rule syntax that you may need.

Your choices:

1) Upgrade to or reinstall a supported version of the OS.
2) Extract the HTML files that match a 4.4-release version of the PF User's Guide from the CVS repository.

In both cases, you will need to read the applicable PF User's Guide. You will find a link to the most recent version of the Guide here.

The rule to prevent certain IP addresses from establishing a connection is the block filter rule. Lists of IP addresses might be most easily managed in a table. Filter rules are described in their own chapter, as are tables.

As for brute force attacks, yes, you can stop them with stateful tracking options, described in the filter rules chapter. Look for overload and flush, and the examples there.
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Old 12th November 2010
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jggimi jggimi is offline
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Hmmm.... based on this, you may want to crack the spine on the book you bought.
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Old 12th November 2010
pico pico is offline
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Yes indeed. Although time is a valued commodity these days. I was just looking for a quick fix.

The book is great but having many other things to do as well I have not had quality time for it. No excuse and I was asking too much.

This particular box does need to be upgraded I will have to do so and go by trial and error.

Thanks anyway.

Regards

P
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Old 12th November 2010
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jggimi jggimi is offline
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Quote:
Although time is a valued commodity these days
Who's is more valuable? Yours or mine?

That was a rhetorical question. Please see this thread for some general guidance.
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Old 12th November 2010
pico pico is offline
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Guidance eh.

I shall take no more of your time.

Regards

P
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