From: Lars Nooden <lars.curator@gmail.com>
To: Elmar Stellnberger <estellnb@gmail.com>
Cc: netfilter@vger.kernel.org
Subject: Re: block network access for certain users/groups
Date: Thu, 29 Jul 2010 22:33:05 +0300 [thread overview]
Message-ID: <4C51D771.1080904@gmail.com> (raw)
In-Reply-To: <op.vgmcupy42qajpl@imac.local>
On 7/29/10 10:09 PM, Elmar Stellnberger wrote:
> iptables -A mychain -m owner --gid-owner blockedusergroup -j DROP
For starters, consider using the REJECT target instead of DROP if for no
other reason than that it will make your engineering easier:
http://www.chiark.greenend.org.uk/~peterb/network/drop-vs-reject
http://www.chrisbrenton.org/2009/07/why-firewall-reject-rules-are-better-than-firewall-drop-rules/
> What will I have to do to implement network access restrictions on a per
> user/group basis?
Follow your chains in sequence and make sure that the packets going to
or from that group have only one way to go. If the packets are getting
through, then there is some chain or rule allowing them through before
the packet gets to the --gid-owner rule you have above.
/Lars
next prev parent reply other threads:[~2010-07-29 19:33 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-07-29 19:09 block network access for certain users/groups Elmar Stellnberger
2010-07-29 19:33 ` Lars Nooden [this message]
2010-07-30 9:00 ` Jan Engelhardt
2010-07-30 11:34 ` Lars Nooden
2010-07-30 20:10 ` Elmar Stellnberger
2010-07-31 5:04 ` Richard Horton
-- strict thread matches above, loose matches on Subject: below --
2010-07-29 19:09 Elmar Stellnberger
2010-07-29 19:33 ` Richard Horton
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