Thursday, May 7, 2009

Sguil on Ubuntu 9.04 in 3 Steps using NSMnow

My previous Sguil/NSMnow recipes used Ubuntu 8.04. I thought I'd play with the new Ubuntu 9.04 and see if there were any differences. It looks like there is a new AppArmor profile for tcpdump that we'll have to configure if we want to pull session transcripts using Sguil. (This is in addition to the AppArmor profile for MySQL that we were already having to configure to allow it to read the load directory.) These steps have been formatted so that you can copy/paste them into your terminal.

Disclaimer: I offer no warranties of any kind. If your box breaks, 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-1.4.0.tar.gz
tar zxvf NSMnow-1.4.0.tar.gz
./NSMnow -i -y
##########################
Step 3: Configure AppArmor and start NSMnow
##########################
if ! grep "/nsm/server_data/server1/load" /etc/apparmor.d/usr.sbin.mysqld > /dev/null
then
# Remove the last line of the file (a single right curly brace)
sed -i '$d' /etc/apparmor.d/usr.sbin.mysqld
# Add a line that allows MySQL to read the load directory
echo " /nsm/server_data/server1/load/* r," >> /etc/apparmor.d/usr.sbin.mysqld
# Append the right curly brace to end the file
echo "}" >> /etc/apparmor.d/usr.sbin.mysqld
fi
if ! grep "/nsm/sensor_data/sensor1/dailylogs" /etc/apparmor.d/usr.sbin.tcpdump > /dev/null
then
# Remove the last line of the file (a single right curly brace)
sed -i '$d' /etc/apparmor.d/usr.sbin.tcpdump
# Add a line that allows tcpdump to read all dailylogs
echo " /nsm/sensor_data/sensor1/dailylogs/**[^/] r," >> /etc/apparmor.d/usr.sbin.tcpdump
echo "}" >> /etc/apparmor.d/usr.sbin.tcpdump
fi
/etc/init.d/apparmor restart
/usr/local/sbin/nsm --all --start
##########################
Snort 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 Snort is analyzing packets and outputting in unified2 format, which is then read by Barnyard2 and inserted into the Sguil database.

When finished, close the Sguil window and return to your NSMnow window. Then type the following to terminate all NSMnow processes:
/usr/local/sbin/nsm --all --stop

Search This Blog

Featured Post

Security Onion 2.4.50 now available including some new features and lots of bug fixes!

Security Onion 2.4.50 is now available! It includes some new features for our fellow defenders and lots of bug fixes! https://docs.securityo...

Popular Posts

Blog Archive