Monday, January 26, 2009

Integrating Snort 3.0 (SnortSP) and Sguil in 3 Steps

So once you have Snort 3.0 installed, what can you do with it? One thing you can do with it (and the one that most people are interested in) is to configure it for IDS mode. The Snort 3.0 architecture includes the Snort 2.8.2 Detection Engine, so we'll have the Snort Security Platform (SnortSP) capturing packets and handing them off to Snort 2.8.2 for analysis and alerting.

The best open source tool to manage Snort alerts is Sguil and the easiest way to install Sguil is using NSMnow. NSMnow automatically installs and configures barnyard2 (compatible with SnortSP's unfied2 format), sancp, Sguil, and Snort 2.x. We're going to replace NSMnow's snort alert process with Snort 3.0.

This quick recipe assumes that you're running on Ubuntu 8.04 and your primary network interface is eth0. You should be able to copy/paste each of the three code blocks into your terminal.

Obligatory disclaimer: I offer no warranty of any kind. If this breaks your box, you get to keep both pieces.

Step 1: Get root privileges
##########################
sudo -i
##########################
Step 2: Install NSMnow
##########################
mkdir /usr/local/src/NSMnow
cd /usr/local/src/NSMnow
wget http://www.securixlive.com/download/nsmnow/NSMnow-1.3.4.tar.gz
tar zxvf NSMnow-1.3.4.tar.gz
./NSMnow -i -y
##########################
Step 3: Configure NSMnow and SnortSP and start
##########################
if ! grep "/nsm/server_data/server1/load" /etc/apparmor.d/usr.sbin.mysqld > /dev/null
then
sed -i 's|}| /nsm/server_data/server1/load/* r,|g' /etc/apparmor.d/usr.sbin.mysqld
echo "}" >> /etc/apparmor.d/usr.sbin.mysqld
fi
/etc/init.d/apparmor restart
/usr/local/sbin/nsm --server --start
/usr/local/sbin/nsm_sensor_ps-start --skip-snort-alert
mkdir /etc/snortsp_alert
cd /etc/snortsp_alert
cp -R /etc/nsm/sensor1/* .
mv snort.conf snort_orig.conf
sspiffy.sh /usr/local -c snort_orig.conf -i eth0
grep -v "sameip" rules/bad-traffic.rules > rules/bad-traffic.rules.2
rm -f rules/bad-traffic.rules
mv rules/bad-traffic.rules.2 rules/bad-traffic.rules
snortsp -C -L snort.lua
##########################
Snort 3.0 is now capturing packets on eth0 and analyzing them. Let's verify that now.

Launch the Sguil client by opening a new terminal and typing the following:
##########################
sguil.tk
##########################
When prompted, login to Sguil using the default credentials:
Username: sguil
Password: password

Next, create some alerts by opening a browser and going to:
http://www.testmyids.com

Finally, go into the Sguil console and you should see two new alerts:


This demonstrates that SnortSP is capturing packets, analyzing them with the Snort 2.8.2 Detection Engine, and outputting in unified2 format, which is then read by Barnyard2 and inserted into the Sguil database.

When finished, return to your SnortSP window and press ctrl-c to terminate the SnortSP process. Then type "nsm --all --stop" to terminate all NSMnow processes.

2 comments:

Anonymous said...

When I try this command:
wget http://www.securixlive.com/download/nsmnow/NSMnow-1.3.4.tar.gz

The error says: 403 Forbidden

So it doesn't work for me.

Doug Burks said...

Hi Anonymous,

This is a really old post (January 2009) about some really old software. You should ignore it and download the Security Onion ISO instead:
http://code.google.com/p/security-onion/wiki/Installation

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