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.
- Course Description
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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.
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- Prerequisites:
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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. -
- In order to ensure that the prerequisites for RHS429 are met,
you should expect to receive a high score for the RH033 and RH133
classes (36 points or more) and a moderate score for the RH253 class
(24 points or more). If one or more of these scores falls below the
recommended level, consider taking the related class before taking
RHS429.
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- Goal:
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Among the most significant features of Red Hat Enterprise Linux is
SELinux (Security Enhanced Linux), a powerful, kernel-level security
layer that provides fine-grained control over what users and
processes may access and execute on a system. By default, SELinux is
enabled on Red Hat Enterprise Linux systems, enforcing a set of
mandatory access controls that Red Hat calls the targeted policy.
These access controls substantially enhance the security of the
network services they target, but can sometimes affect the behavior
of third-party applications and scripts that worked under previous
versions of Red Hat Enterprise Linux.
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- 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.
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- 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.
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- Audience:
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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.
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- 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. -
- Course Outline
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- Unit 1 - Introduction to SELinux?Discretionary Access Control
vs. Mandatory Access Control
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SELinux History and Architecture Overview
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Elements of the SELinux security model:
- user identity and role
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domain and type
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sensitivity and categories
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security context
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SELinux Policy and Red Hat's Targeted Policy
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Configuring Policy with Booleans
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Archiving
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Setting and Displaying Extended Attributes
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Hands-on Lab: Understanding SELinux
- Unit 2 - Using SELinux
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- Controlling SELinux
- File Contexts
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Relabeling Files and Filesystems
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Mount options
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Hand-on Lab: Working with SELinux
- Unit 3 - The Red Hat Targeted Policy?Identifying and Toggling
Protected Services
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Apache Security Contexts and Configuration Booleans
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Name Service Contexts and Configuration Booleans
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NIS Client Contexts
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Other Services
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File Context for Special Directory Trees
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Troubleshooting and avc Denial Messages
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setroubleshootd and Logging
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Hands-on Lab: Understanding and Troubleshooting the Red Hat Targeted
Policy
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- Unit 4 - Introduction to Policies?Policy Overview and
Organization
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Compiling and Loading the Monolithic Policy and Policy Modules
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Policy Type Enforcement Module Syntax
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Object Classes
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Domain Transition
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Hands-on Lab: Understanding policies
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- Unit 5 - Policy Utilities
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?Tools available for manipulating and analyzing policies
- apol
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seaudit and seaudit_report
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checkpolicy
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sepcut
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sesearch
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sestatus
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audit2allow and audit2why
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sealert
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avcstat
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seinfo
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semanage and semodule
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Man pages
- Hands-on Lab: Exploring Utilities
- Unit 6 - User and Role Security?Role-based Access Control
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Multi Category Security
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Defining a Security Administrator
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Multi-Level Security
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The strict Policy
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User Identification and Declaration
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Role Identification and Declaration
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Roles in Use in Transitions
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Role Dominance
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Hands-on Lab: Implementing User and Role Based Policy Restrictions
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- Unit 7 - Anatomy of a Policy?Policy Macros
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Type Attributes and Aliases
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Type Transitions
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When and How do Files Get Labeled
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restorecond
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Customizable Types
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Hands-on Lab: Building Policies
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- Unit 8 - Manipulating Policies?Installing and Compiling
Policies
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The Policy Language
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Access Vector
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SELinux logs
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Security Identifiers - SIDs
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Filesystem Labeling Behavior
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Context on Network Objects
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Creating and Using New Booleans
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Manipulating Policy by Example
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Macros
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Enableaudit
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Hands-on Lab: Compiling Policies
- Unit 9 ? Project Best practices
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Create File Contexts, Types and Typealiases
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Edit and Create Network Contexts
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Edit and Create Domains
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Hands-on Lab: Editing and Writing Policy
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