Re: Snort Inline w/ NFQ doesn't work after reboot

[J Green <corpengineer () gmail com>]

Will try that.

One thing I noticed is that the nfnetlink modules (nfnetlink,
nfnetlink_log, nfnetlink_queue) were not loaded upon reboot.

I reinstalled them manually.  But it is still not working.



On Tue, Nov 29, 2016 at 12:23 PM, James Lay <jlay () slave-tothe-box net>
wrote:

> Best is to look like so:
>
> sudo iptables -nvL
> sudo iptables -t nat -nvL
>
> before and after testing...that should show you what packets went where.
>
> James
>
> On 2016-11-29 12:01, J Green wrote:
> > Will try that.  This seems like a firewall or NFQ issue.
> >
> > Is there a way to get debug logging out of NFQ?
> >
> > Thank you.
> >
> > On Tue, Nov 29, 2016 at 10:51 AM, James Lay <jlay () slave-tothe-box net>
> > wrote:
> >
> > > On 2016-11-29 11:48, J Green wrote:
> > > > Upon reboot, I enter those (2) iptables commands manually, before
> > > > running barnyard.
> > > >
> > > > Still does not work.
> > > >
> > > > Thank you.
> > > >
> > > > On Tue, Nov 29, 2016 at 10:41 AM, James Lay
> > > <jlay () slave-tothe-box net>
> > > > wrote:
> > > >
> > > > > On 2016-11-29 11:31, J Green wrote:
> > > > > > Appreciate the response.  Firewalld/iptables is up.  Though the
> > > > > only
> > > > > > rule I have in there is for access to the Barnyard web gui.
> > > > > >
> > > > > > Thought that rules for inline were added as follows?
> > > > > >
> > > > > > iptables -t nat -I PREROUTING -j NFQUEUE --queue-num 1
> > > > > > iptables -I FORWARD -j NFQUEUE --queue-num 1
> > > > > >
> > > > > > I did have this more granular, only allowing specific ports
> > > > > through
> > > > > > the bridge, but opened it up for troubleshooting purposes.
> > > > > >
> > > > > > All interfaces are up and respond to pings.  I know that I am
> > > > > missing
> > > > > > something simple.
> > > > > >
> > > > > > Thank you.
> > > > >
> > > > > They are added, but once you reboot they are lost.  You'll need
> > > to
> > > > > either create a script to readd them on boot or use
> > > > > iptables-save/iptables-restore commands.
> > > > >
> > > > > James
> > > > >
> > > > > > On Tue, Nov 29, 2016 at 9:25 AM, James Lay
> > > > > <jlay () slave-tothe-box net>
> > > > > > wrote:
> > > > > >
> > > > > > > On 2016-11-28 14:28, J Green wrote:
> > > > > > > > Compiled Snort 2.9.8.3 & DAQ, CentOS 7 (VM).
> > > > > > > >
> > > > > > > > It works w/ NFQ inline.  However, if I reboot the VM, NFQ no
> > > > > > > longer
> > > > > > > > seems to work.  I do not see anything in the logs, etc.
> > > > > > > >
> > > > > > > > Here is how I am running Snort:
> > > > > > > >
> > > > > > > > snort -Q --daq nfq --daq-var device=eth0 --daq-var queue=1 -c
> > > > > > > > /etc/snort/snort.conf &
> > > > > > > >
> > > > > > > > iptables -t nat -I PREROUTING -j NFQUEUE --queue-num 1
> > > > > > > > iptables -I FORWARD -j NFQUEUE --queue-num 1
> > > > > > > >
> > > > > > > > barnyard2 -c /etc/snort/barnyard2.conf -d /var/log/snort -f
> > > > > > > snort.us [1] [1] [1]
> > > > > > > > [1] -w /var/log/snort/barnyard.waldo -g snort -u snort
> > > > > > > >
> > > > > > > > Any input would be appreciated.
> > > > > > > >
> > > > > > > > Thank you.
> > > > > > > >
> > > > > > > >
> > > > > > > >
> > > > > > > > Links:
> > > > > > > > ------
> > > > > > > > [1] http://snort.us
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> > > > > > > Make sure your IP tables rules are reapplied on reboot.
> > > > > > >
> > > > > > > James
> > >
> > > Sounds like you'll want to not run snort in the background for
> > > testing...if it was me I'd packet capture as well.
> > >
> > > James
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