Date: Thu, 16 Oct 2008 21:20:48 -0700 From: Jeremy Chadwick <koitsu@FreeBSD.org> To: Kalpin Erlangga Silaen <kalpin@muliahost.com> Cc: freebsd-questions@freebsd.org Subject: Re: IPFW UID match questions Message-ID: <20081017042048.GA11656@icarus.home.lan> In-Reply-To: <48F7F3FD.5090209@muliahost.com> References: <48F7F3FD.5090209@muliahost.com>
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On Fri, Oct 17, 2008 at 09:10:05AM +0700, Kalpin Erlangga Silaen wrote: > Dear all, > > I tried to implement IPFW rules like below on my shell server: > > /sbin/ipfw -q add 18600 allow tcp from any to personal_ip in > /sbin/ipfw -q add 18650 allow tcp from personal_ip to any out uid kalpin > /sbin/ipfw -q add 18660 allow tcp from personal_ip to any out uid root > /sbin/ipfw -q add 18670 allow tcp from personal_ip to any out uid nobody > /sbin/ipfw -q add 18700 deny tcp from personal_ip to any out > > I hope with this rule, only user kalpin could be use the vhost > personal_ip. Below is brief description > > line 1 will allow all tcp incoming packets into personal_ip > line 2 will allow tcp outgoing packets from personal_ip to anywhere if > match uid kalpin > line 3 same with line 2 if match uid root (to response identd request > from IRC Network if identd run as root) > line 4 same with line 3 if match uid nobody (to response identd request > from IRC Network if identd run as fall into nobody) > line 5 will deny all tcp outgoing packets > > But, IRC Network still could not get ident response from my server. If I > removed line 5, then IRC Network get identd response. My identd process is: > > root 63932 0.0 0.1 3136 1028 ?? Ss 1:46AM 0:00.03 > /usr/local/sbin/oidentd -C /usr/local/etc/oidentd.conf > > Is there anything else should be done to fix this problem? The problem is that you're not allowing incoming connections to personal_ip on TCP port 113 (ident/auth). Add this rule: /sbin/ipfw -q add 18680 allow tcp from personal_ip 113 to any out You can also replace "113" with "auth" or "ident" if you want (see /etc/services). -- | Jeremy Chadwick jdc at parodius.com | | Parodius Networking http://www.parodius.com/ | | UNIX Systems Administrator Mountain View, CA, USA | | Making life hard for others since 1977. PGP: 4BD6C0CB |
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