By Kurt Seifried (firstname.lastname@example.org) (encryption keys here), the LASG is licensed under the OpenContent license (http://www.opencontent.org/).
The LASG is available at: http://www.securityportal.com/lasg/.
I am currently re-organizing the LASG a bit.
Getting started - general concepts
Installing Linux - how to get linux loaded safely
System security - physical and boot security
Authentication - PAM, smartcards, passwords
Files / filesystem security - file permissions, system files
Encryption - filesystem and files
Network security - PPP, TCP-IP, etc
Network servers - Email, FTP, WWW, SSH, etc
Firewalling - IPFWADM, IPCHAINS, IPFW, Phoenix, Sinus
IPSec - IPSecurity setup (recommended for VPN's)
VPN - other alternatives to IPSec
Administration tools - see shell servers for remote access
Limiting and monitoring users - ulimit, ttysnoop, quotas and more
General security techniques - chroot, non root user, subDomain, etc.
System /user logging - syslog
Attack detection - audits, logging and baselines
Intrusion testing - the tools that will be used against you
Software - keeping software up to date, secure programming, software protection methods
Viruses - Anti virus scanners for Linux (think windows clients)
Distribution information - specifics, vendor contact information, etc
Backups - ensuring data continuity
Linux kernel - patching, updating and security
Checklists - some quick to-do lists
Daily tarball of the LASG is available here.
Written by Kurt Seifried