Re: snort-2.9.4, daq 2.0.1 afpacket in inline mode snort fails to drop packets even when RULE is set to drop

[Y M <snort () outlook com>]

Sorry for the noise, I meant if you run Snort in passive mode with the same setup you have.
________________________________
From: Y M<mailto:snort () outlook com>
Sent: ‎8/‎16/‎2013 9:53 PM
To: Robert Greenhouse<mailto:rgreenhouse413 () gmail com>; snort-users () lists sourceforge net<mailto:snort-users () 
lists sourceforge net>
Subject: RE: [Snort-users] snort-2.9.4, daq 2.0.1 afpacket in inline mode snort fails to drop packets even when RULE is 
set to drop







If I recall, --enable-inline is deprecated since a while now, not sure which Snort version; A warning should have been 
shown during compilation. But I do not think that this would affect operating in inline mode now.
If you run snort in inline mode with the same setup you have, do you see packets passing through and alerts are being 
generated for your rule?
Have you changed rules processing order?
Please post the command you are using to run Snort and the rule you are using for testing drops.

From: rgreenhouse413 () gmail com
To: snort () outlook com; rgreenhouse413 () gmail com; snort-users () lists sourceforge net
Subject: Re: [Snort-users] snort-2.9.4, daq 2.0.1 afpacket in inline mode snort fails to drop packets even when RULE is 
set to drop
Date: Fri, 16 Aug 2013 14:08:01 -0400







YM,

Available DAQ modules:
pcap(v3): readback live multi unpriv
dump(v1): readback live inline multi unpriv
afpacket(v4): live inline multi unpriv

We also changed the commandline to –Q –c we removed the frowad rules from
the iptables and used icmp sid:389 in a Drop mode.
Snort is still not blocking?

Can you please help us solve this critical issue.

BTW Snort was compiled with  --enable-inline

Thanks,
Richard





From: Y M
Sent: Friday, August 16, 2013 12:05 PM
To: Robert Greenhouse ; snort-users () lists sourceforge net

Subject: RE: [Snort-users] snort-2.9.4, daq 2.0.1 afpacket in inline
mode snort fails to drop packets even when RULE is set to drop



If you run /snort/bin/snort --daq-list what
is the output of the command?

What does your command look like after the changes? I
would also separate the "-Qc" such as "-Q -c". -Q forces Snort into inline
mode.


What rules are using to see that you are actually dropping? I would start
with one and simple rule such as sid:389 converting it to drop and test if you
drop icmp.


afpacket does not rely on iptables to drop
packets. If you remove the forward rules from your iptables and test, what
happens? We use afpacket and did not configure the iptables the way you
did.


A helpful post on the VRT blog: http://vrt-blog.snort.org/2010/08/snort-29-essentials-daq.html


p.s.: please post to the list as it is of
everyones interest :)


Thanks.
YM




From: rgreenhouse413 () gmail com
To: snort () outlook com;
rgreenhouse413 () gmail com
Subject: Re: [Snort-users] snort-2.9.4, daq 2.0.1
afpacket in inline mode snort fails to drop packets even when RULE is set to
drop
Date: Fri, 16 Aug 2013 10:25:30 -0400






Thank you for your response.
I removed "--treat-drop-as-alert”, but we are
still not blocking?
Can you suggest any other
action I can take?

Thanks,
Richard





From: Y
M
Sent: Thursday, August 15, 2013 6:36 PM
To: Robert Greenhouse
Subject: RE: [Snort-users] snort-2.9.4, daq 2.0.1 afpacket in inline
mode snort fails to drop packets even when RULE is set to drop


I see from the command that you are using "--treat-drop-as-alert", is there
a reason for that? Have a look at the last table on  http://manual.snort.org/node11.html from Snort's online
documentation:

Adapter Mode
|
Snort
args
|    config policy_mode   |   Drop Rule
Handling

Inline
-Q
-treat-drop-as-alert
inline
Alert




From: rgreenhouse413 () gmail com
To: snort () outlook com
Subject: Re:
[Snort-users] snort-2.9.4, daq 2.0.1 afpacket in inline mode snort fails to drop
packets even when RULE is set to drop
Date: Thu, 15 Aug 2013 18:28:12
-0400






Thanks, Much appreciated.
I have done what you suggested, but I am still not blocking. Here is the
command line:

/snort/bin/snort -Qc /snort/etc/snort.conf –d --treat-drop-as-alert --daq
afpacket --daq-mode inline --daq-dir /snort/daq/lib64/daq –l  /snort/logs
-i eth0:eth1 --daq-var buffer_size_mb=512 --daq-var debug &

Here is our iptables:

echo 1 > /proc/sys/net/ipv4/ip_forward
iptables -I FORWARD -i eth0 -o eth1 -j ACCEPT
iptables -I FORWARD -i eth1 -o eth0 -j ACCEPT

And I have modified snort.conf to include:

config policy_mode:inline

Your help is much appreciated..

Thanks,
Richard






From: Y
M
Sent: Thursday, August 15, 2013 5:16 PM
To: Robert Greenhouse ; snort-users () lists sourceforge net

Subject: RE: [Snort-users] snort-2.9.4, daq 2.0.1 afpacket in inline
mode snort fails to drop packets even when RULE is set to drop



Sorry I missed that --> you also need to add the -Q to your
command.



To: rgreenhouse413 () gmail com; snort-users () lists sourceforge net
From:
snort () outlook com
Date: Fri, 16 Aug 2013 00:08:55 +0300
Subject: Re:
[Snort-users] snort-2.9.4, daq 2.0.1 afpacket in inline mode snort fails to drop
packets even when RULE is set to drop



Does adding
--daq-mode inline to your command and config policy_mode:inline to your snort
configuration file change the behavior?



From:
Robert Greenhouse
Sent:
‎8/‎15/‎2013 11:45
PM
To:
snort-users () lists sourceforge net
Subject:
[Snort-users]
snort-2.9.4, daq 2.0.1 afpacket in inline mode snort fails to drop packets even
when RULE is set to drop





Hi,
snort-2.9.4, daq 2.0.1 afpacket in inline mode snort fails to drop packets
even when RULE is set to drop?
We have our system setup to inline mode using afpacket (./snort --daq
afpacket -i eth0:eth1).

Also have iptables configured to:

iptables -I FORWARD -i eth0 -o eth1 -j ACCEPT
iptables -I FORWARD -i eth1 -o eth0 -j ACCEPT

echo 1 > /proc/sys/net/ipv4/ip_forward

Why doesn’t snort drop the packet when the rule fires?

This is a major problem

Thanks,
Richard

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