LinuxSecurity.com
Share your story
The central voice for Linux and Open Source security news
Home News Topics Advisories HOWTOs Features Newsletters About Register

Welcome!
Sign up!
EnGarde Community
Login
Polls
What is the most important Linux security technology?
 
Advisories
Community
Linux Events
Linux User Groups
Link to Us
Security Center
Book Reviews
Security Dictionary
Security Tips
SELinux
White Papers
Featured Blogs
All About Linux
DanWalsh LiveJournal
Securitydistro
Latest Newsletters
Linux Advisory Watch: July 18th, 2014
Linux Advisory Watch: July 13th, 2014
Subscribe
LinuxSecurity Newsletters
E-mail:
Choose Lists:
About our Newsletters
RSS Feeds
Get the LinuxSecurity news you want faster with RSS
Powered By

  
User Authentication HOWTO

User Authentication HOWTO

Peter Hernberg

2000-05-02

Revision History
Revision 0.92004-04-03Revised by: fl
updated external links
Revision 0.82003-02-20Revised by: fl
language changes, various small fixes
Revision 0.52000-05-15Revised by: ph
added section on securing pam, added resources section
Revision 0.12000-05-02Revised by: ph
initial version

Explains how user and group information is stored and how users are authenticated on a Linux system (PAM), and how to secure you system's user authentication.


1. Introduction

1.1. How this document came to be

When trying to add a number of (mostly unnecessary :) network services to my existing home network, I kept running into the problem of authentication, so I decided to figure out how authentication works on linux systems, write a HOWTO, and call it my senior project. I hope this document helps you understand this often-forgotten, but very important, aspect of system administration.

1.2. New versions

Unitl I get my domain up and running properly, the newest version of this document will be available from http://www.linuxdoc.org/.

1.3. Feedback

Comments, corrections, suggestions, flames, and flying saucer sightings can be sent to petehern@yahoo.com.

1.4. Copyrights and Trademarks

(c) 2000 Peter Hernberg

This manual may be reproduced in whole or in part, without fee, subject to the following restrictions:

  • The copyright notice above and this permission notice must be preserved complete on all complete or partial copies

  • Any translation or derived work must be approved by the author in writing before distribution.

  • If you distribute this work in part, instructions for obtaining the complete version of this manual must be included, and a means for obtaining a complete version provided.

  • Small portions may be reproduced as illustrations for reviews or quotes in other works without this permission notice if proper citation is given. Exceptions to these rules may be granted for academic purposes: Write to the author and ask. These restrictions are here to protect us as authors, not to restrict you as learners and educators. Any source code (aside from the SGML this document was written in) in this document is placed under the GNU General Public License, available via anonymous FTP from the GNU archive.

1.5. Acknowledgements and Thanks

Thanks to my family for putting up with me for 18 years. Thanks to the Debian folks for making such a sweet distro for me to play with. Thanks to CGR for paying me to be a geek. Thanks to Sandy Harris for his helpful suggestions. Finally, I'd like thank the makers of ramen noodles, because I don't know how I'd live without them.

1.6. Assumptions about the reader

For the purpose of this document, it is assumed that the reader is comfortably with executing commands at the command line and editing text configuration files.

    
Partner

 

Latest Features
Peter Smith Releases Linux Network Security Online
Securing a Linux Web Server
Password guessing with Medusa 2.0
Password guessing as an attack vector
Squid and Digest Authentication
Squid and Basic Authentication
Demystifying the Chinese Hacking Industry: Earning 6 Million a Night
Free Online security course (LearnSIA) - A Call for Help
What You Need to Know About Linux Rootkits
Review: A Practical Guide to Fedora and Red Hat Enterprise Linux - Fifth Edition
Yesterday's Edition
Router hacking competition announced for Defcon
EFF wants hackers to help build an open, secure router
Hackers Could Take Control of Your Car. This Device Can Stop Them
Partner Sponsor

Community | HOWTOs | Blogs | Features | Book Reviews | Networking
 Security Projects |  Latest News |  Newsletters |  SELinux |  Privacy |  Home
 Hardening |   About Us |   Advertise |   Legal Notice |   RSS |   Guardian Digital
(c)Copyright 2014 Guardian Digital, Inc. All rights reserved.