What I am asking is since this uses IPTABLES, should I just set up permanent
"firewall type" IPTABLE rules and then use the modified snort rules to take
care of the resets, drops, etc?
Yes
On Tue, 28 Dec 2004 18:02:12 -0500, Michael D. Peters
<mdpeters@lazarusalliance.com> wrote:
What I am asking is since this uses IPTABLES, should I just set up permanent
"firewall type" IPTABLE rules and then use the modified snort rules to take
care of the resets, drops, etc?
Will Metcalf writes:
If I have something like this: <GATEWAY-ROUTER> connected to <FIREWALL>
connected to <SNORT_INLINE> connected to <NETWORK HUB OR SWITCH>. Would I
set the "var HOME_NET any" to "var HOME_NET nnn.nnn.nnn.nnn/xx?
Yes
Do I need to make a startup script for IPTABLE rules or do I rely on
drop.rules or both? I'm inclined to think that the firewall rules will be
essentially duplicated with IPTABLES and the drop.rules interactively
supplement the IPTABLES.
I'm not really sure what you are asking for here...... Usually it is
a good idea to have a couple of iptables rules to check state for tcp
state etc. Just off the top of my head.....
iptables -P FORWARD DROP
iptables -A FORWARD -p tcp --syn -m state --state NEW -j QUEUE
iptables -A FORWARD -p tcp -m state --state RELATED,ESTABLISHED -j QUEUE
iptables -A FORWARD -p udp -j QUEUE
iptables -A FORWARD -p icmp -j QUEUE
Would MySQL logging be done the same way for Snort-inline as it is with
regular Snort?
output database: alert, mysql, dbname=snort user=snortuser host=localhost
password=snortuserpassword
Yes
Regards,
Will
On Tue, 28 Dec 2004 10:58:28 -0500, mdpeters
<michael.peters@lazarusalliance.com> wrote:
Concerning the snort-inline.conf file, are the "var" statements relevant?
Should I specify the network and subnet that the snort-inline box runs on?
If I have something like this: <GATEWAY-ROUTER> connected to <FIREWALL>
connected to <SNORT_INLINE> connected to <NETWORK HUB OR SWITCH>. Would I
set the "var HOME_NET any" to "var HOME_NET nnn.nnn.nnn.nnn/xx?
Do I need to make a startup script for IPTABLE rules or do I rely on
drop.rules or both? I'm inclined to think that the firewall rules will be
essentially duplicated with IPTABLES and the drop.rules interactively
supplement the IPTABLES.
Thank you for the continued education and assistance. :)
----- Original Message -----
From: "Will Metcalf" <william.metcalf@gmail.com>
To: "mdpeters" <michael.peters@lazarusalliance.com>
Sent: Monday, December 27, 2004 12:04 PM
Subject: Re: [Snort-users] Inline IP_Forwarding and other simple questions?
because, you are not pulling traffic off of the bridge. You are
pulling traffic out of iptables, via the QUEUE target. As far as the
rules go, you need to convert alert to drop/sdrop/reject.
Regards,
Will
On Mon, 27 Dec 2004 11:36:10 -0500, mdpeters
<michael.peters@lazarusalliance.com> wrote:
One instance for both interfaces or just one like you wrote? How does it
know what interface the bridge is on?
----- Original Message -----
From: "Will Metcalf" <william.metcalf@gmail.com>
To: "mdpeters" <michael.peters@lazarusalliance.com>
Sent: Monday, December 27, 2004 11:00 AM
Subject: Re: [Snort-users] Inline IP_Forwarding and other simple
questions?
look at inline readme file under doc in your source.
you were close....
/opt/snort/bin/snort-inline -Q -l /var/log/snort/ -D -c
/opt/snort/etc/snort_inline.conf
something like that...
Regards,
Will
On Mon, 27 Dec 2004 09:46:33 -0500, mdpeters
<michael.peters@lazarusalliance.com> wrote:
Right now I have this running:
/opt/snort/bin/snort-inline -Q -c /opt/snort/etc/inline1.conf -i
eth1 -l
/var/log/snort-inline1 -D
/opt/snort/bin/snort-inline -Q -c /opt/snort/etc/inline2.conf -i
eth2 -l
/var/log/snort-inline2 -D
I apparently do not understand how inline works.
What would the snort-inline command be to work on a transparent
bridge
snort-inline with iptables?
Where can I read up?
I appreciate your help!
----- Original Message -----
From: "Will Metcalf" <william.metcalf@gmail.com>
To: "mdpeters" <michael.peters@lazarusalliance.com>
Sent: Monday, December 27, 2004 8:14 AM
Subject: Re: [Snort-users] Inline IP_Forwarding and other simple
questions?
neither you would use the -Q switch to tell snort to read from
ip_queue. Then you have to send traffic to snort with iptables
with
a
rule like this.
iptables -A FORWARD -j QUEUE
On Mon, 27 Dec 2004 00:06:30 -0500, mdpeters
<michael.peters@lazarusalliance.com> wrote:
Would I need to use the bridge "br0" group interface or the
individual
interfaces "eth0' and "eth1" that make up the group for the
Snort-inline
start command?
Thanks,
Michael
----- Original Message -----
From: "Will Metcalf" <william.metcalf@gmail.com>
To: "Matt Kettler" <mkettler@evi-inc.com>
Cc: "mdpeters" <michael.peters@lazarusalliance.com>;
<snort-users@lists.sourceforge.net>
Sent: Thursday, December 23, 2004 4:43 PM
Subject: Re: [Snort-users] Inline IP_Forwarding and other simple
questions?
Well said, except that drop does not reset the connection.
Using
reject will drop and reset the connection.
Regards,
Will
On Thu, 23 Dec 2004 15:21:37 -0500, Matt Kettler
<mkettler@evi-inc.com>
wrote:
At 02:04 PM 12/23/2004, mdpeters wrote:
Do I need to enable ip_forwarding on for the transparent
bridge
to
work?
As I understand it, you explicitly MUST NOT enable
ip_forwarding,
otherwise
your snort-inline is a "pass all".
Do I need to install ebtables for inline to disrupt traffic or
is
iptables, libnet, and libpcap all that I might need?
AFAIK you don't need ebtables. You do need libipq for inline
and
libnet.
This is how snort-inline attaches to iptables by using libipq
instead
of
using libpcap.
It is my impression that iptables just firewalls with static
rules.
On it's own, yes, but IPTables is VERY extensible via libipq..
That's where snort-inline comes in. Snort-inline interacts with
iptables.
It doesn't do things like create iptables rules to block
packets,
it
the
whole system becomes an iptables rule, it just happens to be a
rule
that
runs snort instead of some simple expression.
Do the snort rules running on the transparent inline snort box
reset
the
traffic that passes through using inline?
Depends on if you use DROP or SDROP :).. However, inline
doesn't
JUST
reset
the traffic.. it also prevents the packet from being forwarded
at
all.
DROP
will also reset, SDROP won't.
Snort 2.3's inline capacity is a direct port of snort-inline.
You
might
want to check their FAQ for other info:
http://snort-inline.sourceforge.net/FAQ.html
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Best regards,
Michael D. Peters
Director of Security Services
CISSP
Lazarus Alliance Inc.
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