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# The Linux-PAM System Administrators' Guide

## Andrew G. Morgan, `morgan@kernel.org`

DRAFT v0.76 2002/06/26

This manual documents what a system-administrator needs to know about the Linux-PAM library. It covers the correct syntax of the PAM configuration file and discusses strategies for maintaining a secure system.

## 1. Introduction

## 2. Some comments on the text

## 3. Overview

- 3.1 Getting started

## 4. The Linux-PAM configuration file

- 4.1 Configuration file syntax
- 4.2 Directory based configuration
- 4.3 Generic optional arguments
- 4.4 Example configuration file entries

## 5. Security issues of Linux-PAM

- 5.1 If something goes wrong
- 5.2 Avoid having a weak `other' configuration

## 6. A reference guide for available modules

- 6.1 The access module
- 6.2 Chroot
- 6.3 Cracklib pluggable password strength-checker
- 6.4 The locking-out module
- 6.5 Set/unset environment variables
- 6.6 The filter module
- 6.7 Anonymous access module
- 6.8 The group access module
- 6.9 Add issue file to user prompt
- 6.10 The Kerberos 4 module.
- 6.11 The last login module
- 6.12 The resource limits module
- 6.13 The list-file module
- 6.14 The mail module
- 6.15 Create home directories on initial login
- 6.16 Output the motd file
- 6.17 The no-login module
- 6.18 The promiscuous module
- 6.19 The Password-Database module
- 6.20 The RADIUS session module
- 6.21 The rhosts module
- 6.22 The root access module
- 6.23 The securetty module
- 6.24 The login counter (tallying) module
- 6.25 Time control
- 6.26 The Unix Password module
- 6.27 The userdb module
- 6.28 Warning logger module
- 6.29 The wheel module

## 7. Files

## 8. See also

## 9. Notes

## 10. Author/acknowledgments

## 11. Bugs/omissions

## 12. Copyright information for this document

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