CentOS 5
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Network based IDS - Snort
2008/08/15
  Install Snort that is Network based IDS.

[1] Install and configure Snort
[root@www ~]#
wget http://www.snort.org/dl/binaries/linux/snort-2.8.2.1-1.RH5.i386.rpm


[root@www ~]#
rpm -Uvh snort-2.8.2.1-1.RH5.i386.rpm

Preparing...
############################ [100%]

   1:snort
############################ [100%]

[root@www ~]#
vi /etc/snort/snort.conf


# line 46: change to LAN

var HOME_NET
192.168.0.0/24


# line 49: change

var EXTERNAL_NET
!$HOME_NET


[root@www ~]#
vi /etc/logrotate.d/snort


# line 4: change

/var/log/snort/alert /var/log/snort/*log {
[2] Register from here for free in order to get snort rule files. After registration, download "snortrules-snapshot-CURRENT.tar.gz" and upload it on your server.

[3] Install the file that is uploaded on [2] and start Snort.
[root@www ~]#
tar zxvf snortrules-snapshot-CURRENT.tar.gz

[root@www ~]#
cp -r rules/* /etc/snort/rules/

[root@www ~]#
rm -rf doc etc rules so_rules

[root@www ~]#
/etc/rc.d/init.d/snortd start

Starting snort:    [  OK  ]
[root@www ~]#
chkconfig snortd on
[4] Install SnortSnarf in order to watch logs of Snort from Web browser.
[root@www ~]#
yum --enablerepo=dag install perl-Time-module

[root@www ~]#
wget http://www.snort.org/dl/contrib/data_analysis/snortsnarf/SnortSnarf-050314.1.tar.gz

[root@www ~]#
tar zxvf SnortSnarf-050314.1.tar.gz

[root@www ~]#
mkdir /usr/local/bin/snortsnarf

[root@www ~]#
cp SnortSnarf-050314.1/snortsnarf.pl /usr/local/bin/snortsnarf/

[root@www ~]#
cp -r SnortSnarf-050314.1/include /usr/local/bin/snortsnarf/

[root@www ~]#
vi /usr/local/bin/snortsnarf/include/SnortSnarf/HTMLMemStorage.pm


# line 290: change (remove '->')

return @arr[($first-1)..$end];

[root@www ~]#
vi /usr/local/bin/snortsnarf/include/SnortSnarf/HTMLAnomMemStorage.pm


# line 266: change (remove '->')

return @arr[($first-1)..$end];

[root@www ~]#
vi /etc/httpd/conf.d/snort.conf


Alias /snort /var/www/snort

<Location /snort>
   Order deny,allow
   Deny from all
  
# IP address you allow

   Allow from 127.0.0.1 192.168.0
</Location>


[root@www ~]#
/etc/rc.d/init.d/httpd restart

Stopping httpd:
[  OK  ]

Starting httpd:
[  OK  ]

[root@www ~]#
vi snortsnarf.sh
# create init script


#!/bin/bash

cd /usr/local/snortsnarf
if [ -s /var/log/snort/alert ]; then
    if [ -s /var/log/snort/portscan.log ]; then
       ./snortsnarf.pl -dns -d /var/www/snort /var/log/snort/alert /var/log/snort/portscan.log
    else
       ./snortsnarf.pl -dns -d /var/www/snort /var/log/snort/alert
    fi
fi


[root@www ~]#
chmod 700 snortsnarf.sh

[root@www ~]#
./snortsnarf.sh
# run

[root@www ~]#

*/10 * * * * /root/snortsnarf.sh
# run every 10 minutes
[5] Access to the page you set with web browser, then SnortSnarf start page is shown and you can watch the logs of Snort.
 
[6] Try to portscan with nmap from your another Host to your Snort Server and verify Snort logs.
 
[7] Install Oinkmaster in order to update rule files automatically. A code is necessarry for it, Login and push "Get Code" in the site and remember it.
[root@www ~]#
wget http://jaist.dl.sourceforge.net/sourceforge/oinkmaster/oinkmaster-2.0.tar.gz 

[root@www ~]#
tar zxvf oinkmaster-2.0.tar.gz

[root@www ~]#
cp oinkmaster-2.0/oinkmaster.pl /usr/local/bin/

[root@www ~]#
cp oinkmaster-2.0/oinkmaster.conf /etc/

[root@www ~]#
rm -rf oinkmaster-2.0

[root@www ~]#
vi /etc/oinkmaster.conf


# line 55: change code you got

url = http://www.snort.org/pub-bin/oinkmaster.cgi/
(your code)
/snortrules-snapshot-CURRENT.tar.gz

[root@www ~]#
oinkmaster.pl -o /etc/snort/rules/
 
# run

Loading /etc/oinkmaster.conf
Downloading file from http://www.snort.org/pub-bin/oinkmaster.cgi/*oinkcode*/snortrules-snapshot-CURRENT.tar.gz... done.
Archive successfully downloaded, unpacking... done.
Setting up rules structures...
WARNING: duplicate SID in your local rules, SID 3017 exists multiple times, you may need to fix this manually!
done.
Processing downloaded rules... disabled 0, enabled 0, modified 0, total=12183
Setting up rules structures...
WARNING: duplicate SID in your local rules, SID 3017 exists multiple times, you may need to fix this manually!
done.
Comparing new files to the old ones... done.

[***] Results from Oinkmaster started 20080621 23:56:39 [***]

[*] Rules modifications: [*]
   None.

[*] Non-rule line modifications: [*]
   None.

[*] Added files: [*]
   None.

[root@www ~]#
vi oinkmaster.sh
# create init script


#!/bin/sh

/usr/bin/oinkmaster.pl -o /etc/snort/rules/ 2>&1 | logger -t oinkmaster
/etc/rc.d/init.d/snortd restart > /dev/null


[root@www ~]#
chmod 700 oinkmaster.sh

[root@www ~]#
./oinkmaster.sh
# run

[root@www ~]#

0 1 * * * /root/oinkmaster.sh
# run every 1:00 AM
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