The SAMHAIN file integrity / host-based intrusion detection system
Overview
The samhain open source host-based intrusion detection system (HIDS) provides file integrity checking and logfile monitoring/analysis, as well as rootkit detection, port monitoring, detection of rogue SUID executables, and hidden processes.
It has been designed to monitor multiple hosts with potentially different operating systems, providing centralized logging and maintenance, although it can also be used as standalone application on a single host.
Samhain is a multiplatform applcation for POSIX systems (Unix, Linux, Cygwin/Windows).
«We have samhain running on over 200 servers being managed by beltane. Its working really well so far. Excellent software.»
-- Mike
Samhain in the press
- Keep Crackers Out of the Box with Samhain
[enterprise networking planet] - Yes Virginia, There is a Cracker in Your Box
[enterprise networking planet] 
Host Integrity Monitoring Using Osiris & Samhain [Author: Brian Wotring, Publisher: Syngress]
- Projects on the Move [Linux Magazine, PDF]
- Host-based intrusion detection with samhain [Newsforge]
- Host Integrity Monitoring: Best Practices for Deployment [SecurityFocus]
- Centralized File-Integrity With Samhain [Linuxsecurity.com]
- A comparison of file integrity checkers
Features
» Centralized monitoring
The client/server architecture allows central logging, central storage of baseline databases and client configurations, and central updates of baseline databases.
» Web-based management console
The web-based Beltane console, available as separate package, allows to monitor server and client activity, view client reports, and update the baseline databases.
» Multiple logging facilities
Samhain supports multiple logging facilities, each of which can be configured individually.
» Tamper resistance
Samhain offers PGP-signed database and configuration files, a stealth mode, and several more features to protect its integrity.