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Course Overview RHS429 introduces advanced system administrators, security administrators, and applications programmers to SELinux policy writing. Participants in this course will learn how SELinux works; how to manage SELinux; and how to write an SELinux policy. This class culiminates in a major project to scope out and then write policies for previously unprotected services. RHS429 provides a four day tutorial on SELinux and SELinux policy writing. The first day of the course provides a introduction to SELinux, how it operates within the Red Hat targeted policy, and the tools used to manipulate it. The class then will spend the remaining days learning how policies are written, compiled, and debugged. This culminates in a project in which participants will create a set of policies from scratch for a previously unprotected service. The class will analyze the service, determining its security needs; design and implement a set of policies; test and fix the policies; document the service's new policies so that others can effectively administer the service. Audience RHS429 is designed for computer security specialists and other system administrators responsible for setting and implementing security policies on a Linux computer. Applications programmers also may consider taking the course to understand how to provide a set of SELinux policies for third party applications. Participants need not have indepth knowledge of SELinux, but should have a basic understanding of the SELinux security layer. For example, SELinux information as taught in RH133 or RH300 is sufficient. This course has been classified as IT Technical Training. Prerequisites RHS429 requires RHCE-level skills. Prerequisite skills can be shown by passing the RHCE Exam in either RH302 or RH300, or by taking RH253 or by possessing comparable skills and knowledge. Course Outline Unit 1 - Introduction to SELinux - Discretionary Access Control vs. Mandatory Access Control
- SELinux History and Architecture Overview
- Elements of the SELinux security model:
- user identity and role
- domain and type
- sensitivity and categories
- security context
- SELinux Policy and Red Hat's Targeted Policy
- Configuring Policy with Booleans
- Archiving
- Setting and Displaying Extended Attributes
- Hands-on Lab: Understanding SELinux
Unit 2 - Using SELinux - Controlling SELinux
- File Contexts
- Relabeling Files and Filesystems
- Mount options
- Hand-on Lab: Working with SELinux
Unit 3 - The Red Hat Targeted Policy - Identifying and Toggling Protected Services
- Apache Security Contexts and Configuration Booleans
- Name Service Contexts and Configuration Booleans
- NIS Client Contexts
- Other Services
- File Context for Special Directory Trees
- Troubleshooting and avc Denial Messages
- setroubleshootd and Logging
- Hands-on Lab: Understanding and Troubleshooting the Red Hat Targeted Policy
Unit 4 - Introduction to Policies - Policy Overview and Organization
- Compiling and Loading the Monolithic Policy and Policy Modules
- Policy Type Enforcement Module Syntax
- Object Classes
- Domain Transition
- Hands-on Lab: Understanding policies
Unit 5 - Policy Utilities - Tools available for manipulating and analyzing policies
- apol
- seaudit and seaudit_report
- checkpolicy
- sepcut
- sesearch
- sestatus
- audit2allow and audit2why
- sealert
- avcstat
- seinfo
- semanage and semodule
- Man pages
- Hands-on Lab: Exploring Utilities
Unit 6 - User and Role Security - Role-based Access Control
- Multi Category Security
- Defining a Security Administrator
- Multi-Level Security
- The strict Policy
- User Identification and Declaration
- Role Identification and Declaration
- Roles in Use in Transitions
- Role Dominance
- Hands-on Lab: Implementing User and Role Based Policy Restrictions
Unit 7 - Anatomy of a Policy - Policy Macros
- Type Attributes and Aliases
- Type Transitions
- When and How do Files Get Labeled
- restorecond
- Customizable Types
- Hands-on Lab: Building Policies
Unit 8 - Manipulating Policies - Installing and Compiling Policies
- The Policy Language
- Access Vector
- SELinux logs
- Security Identifiers - SIDs
- Filesystem Labeling Behavior
- Context on Network Objects
- Creating and Using New Booleans
- Manipulating Policy by Example
- Macros
- Enableaudit
- Hands-on Lab: Compiling Policies
Unit 9 - Project - Best practices
- Create File Contexts, Types and Typealiases
- Edit and Create Network Contexts
- Edit and Create Domains
- Hands-on Lab: Editing and Writing Policy
How to make a booking for the RH429 course
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