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This document was written when I created an IDS sensor with Snort and using some statistic tools in order to help others implementing it. If at least one out there can be helped it has been worth the work.
Snort is an excellent Network Intrusion Detection System (NIDS) for various unices. The Snort homepage can be found at http://www.snort.org/. The version described here is 1.8.3 which was the actual version at the time of writing.
The statistic tools I will describe here are ACID, a database analysis tool for Snort which can be found at http://www.cert.org/kb/acid/ and SnortSnarf, a statistic tool for Snort logs downloadable from http://www.silicondefense.com/software/snortsnarf/index.htm.
Additional support packages are needed for ACID. These are a PHP4 capable webserver like apache (http://www.apache.org/), PHPlot used for creating graphs in PHP (http://www.phplot.com/) and ADODB used for connecting to databases with PHP (http://php.weblogs.com/ADODB/).
The description also includes which additional software is needed for ACID and how to configure along with some scripts I use including a changed version of the snortd initscript and a short chapter about swatch (http://www.stanford.edu/~atkins/swatch) a log file watcher script written in perl. I created a swatch RPM which can be found at http://www.lug-burghausen.org/projects/Snort-Statistics/swatch-3.0.2-1.noarch.rpm.
One hint for those interested in maintaining more than one snort sensor: You might take a look at IDSPM (IDS Policy Manager) at http://www.activeworx.com/ which is an application to maintain various sensors with different policies along with merging capabilities for new rules and a lot more. The only "nasty" thing is that it runs on W2K/XP and is not (yet?) Open Source.
This document is copyrighted (c) 2001, 2002 Sandro Poppi and is distributed under the terms of the Linux Documentation Project (LDP) license, stated below.
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No liability for the contents of this documents can be accepted. Use the concepts, examples and other content at your own risk. As this is a new edition of this document, there may be errors and inaccuracies, that may of course be damaging to your system. Proceed with caution, and although this is highly unlikely, the author(s) do not take any responsibility for that.
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Naming of particular products or brands should not be seen as endorsements.
You are strongly recommended to take a backup of your system before major installation and backups at regular intervals.
This is the initial release.
The main site for this HOWTO is http://www.lug-burghausen.org/projects/Snort-Statistics/.
Mirrors may be found at the Linux Documentation Project or Snort homepages.
The newest version of this HOWTO will always be made available on the main website, in a variety of formats:
Credits go to a variaty of people including
Martin Roesch <roesch at sourcefire.com> Author of Snort
Roman Danyliw <roman at danyliw.com> Author of ACID
James Hoagland <hoagland at SiliconDefense.com> Author of SnortSnarf
Stuart Staniford <stuart at SiliconDefense.com> Author of SnortSnarf
Joe McAlerney <joey at siliconDefense.com> Author of SnortSnarf
John Lim <jlim at natsoft.com.my> Author of ADODB
Afan Ottenheimer <afan at users.sourceforge.net> Author of PHPlot
Andreas жstling <andreaso at it.su.se> Author of arachnids_upd
Max Vision <vision at whitehats.com> "Distributor" of vision.rules and maintainer of http://www.whitehats.com/
Greg Sarsons <gsarsons at home.com> for proof reading and suggestions
All the peaople on the snort-users mailinglist, they helped me and of course they will help YOU >;)
...
If I missed someone it was not because of not honoring her or his work!
Feedback is most certainly welcome for this document. Without your submissions and input, this document wouldn't exist. Please send your additions, comments and criticisms to the following email address : <spoppi at gmx.de>.
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