Security Quick-Start HOWTO for Linux

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Content
Security Quick-Start HOWTO for Linux
Hal Burgiss
hal@foobox.net
v. 1.0, 2001-10-29
This document is a an overview of the basic steps required to secure a Linux installation from intrusion. It is
intended to be an introduction.
Table of Contents
1. Introduction
1.1. Why me?
1.2. Copyright
1.3. Credits
1.4. Disclaimer
1.5. New Versions and Changelog
1.6. Feedback
2. Foreword
2.1. The Optimum Configuration
2.2. Before We Start
3. Step 1: Which services do we really need?
3.1. System Audit
3.2. The Danger Zone (or r00t m3 pl34s3)
3.3. Stopping Services
3.4. Exceptions
3.5. Summary and Conclusions for Step 1
4. Step 2: Updating
4.1. Summary and Conclusions for Step 2
5. Step 3: Firewalls and Setting Access Policies
5.1. Strategy
5.2. Packet Filters — Ipchains and Iptables
5.3. Tcpwrappers (libwrap)
5.4. PortSentry
5.5. Proxies
5.6. Individual Applications
5.7. Verifying
5.8. Logging
5.9. Where to Start
5.10. Summary and Conclusions for Step 3
6. Intrusion Detection
6.1. Intrusion Detection Systems (IDS)
6.2. Have I Been Hacked?
6.3. Reclaiming a Compromised System
7. General Tips
8. Appendix
Revision History
Revision v. 1.0 2001-10-29 Revised by: hb
Initial Release.
Security Quick-Start HOWTO…