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SELinux Training

SELinux, or Security-Enhanced Linux, is a part of the Linux security kernel that acts as a protective agent on servers. In the Linux kernel, SELinux relies on mandatory access controls (MAC) that restrict users to rules and policies set by the system administrator. MAC is a higher level of access control than the standard discretionary access control (DAC), and prevents security breaches in the system by only processing necessary files that the administrator pre-approves. SELinux acts under the least-privilege model. SELinux only grants access if the administrator writes a specific policy to do so.

Bestemde gehoor

This course will significantly benefit for system administrators & also linux admin.


Candidates should have 5-6 years of working experience of Linux Admin.

Course Outline Duration: 04 Days

Dag 1

  • Boot Options for SELinux
  • Enabling user home directories – SELinux Settings for User Home Directories
  • Targeted Policy Protected Services – Default list of SELinux Protected Services
  • Identifying and Toggling Protected Services –Working Booleans
  • File Context for Special Directory Trees – Setting Persistent SELinux Contexts on Directory Tries.
  • Probleemoplossing
    • Identify the Problem
    • avc: denied Messages, understanding with Examples
    • setroubleshootd – The System Deamon and its use
    • SELinux Logging
    • Understanding and Troubleshooting the Targeted Policy
  • Packaging and deployment of SELinux policy on target
    • Device based restrictions. E.g hardware, ports etc

Lab 1 XCHARX Using fixfiles Script

Lab 2 XCHARX Setting mount contexts

Dag 2

  • SELinux Policies
    • Policy Overview
    • Policy Organization
    • Installing the source RPM and preparing the build area
    • Build the base policy package
    • Compiling the Monolithic Policy
    • Loading the Monolithic Policy
    • Compiling Policy Modules
    • Loading Policy Modules
    • Policy Type-Enforcement Module Syntax
    • Policy Type-Enforcement Module Example
  • semodule
  • Introduction to Object Classes

Lab 3. Understanding policies

Lab 4. Exploring CGI scripts

Lab 5. Modifying an existing policy

  • Policy Utilities: seaudit, seaudit_report, checkpolicy, sesearch, sestatus, audit2allow, audit2why, sealer, avcstat, seinfo and semanage

Lab 6. Exploring Utilities

Dag 3

  • User and Role Security
    • Role-based Access Control
    • Multi Category Security – MCS
    • Multi Category Security: translation and login
    • The chcat – change file security category
  • Defining a SecurityAdministrator: sudo,chcat and root
  • Multi-Level Security – MLS
  • The strict Policy
  • General Identification
  • User Identification:system_u, users_u and root, Declaring Users
  • Role Identification: Declaring Roles, Roles in use in Transitions, Role Dominance
  • Domain Transition
  • Polyinstantiation of Directories
  • Policy Macros
  • Types : Enforcement, Attributes, Aliases and Transitions for Objects
  • restorecond
  • Customizable Types
  • File Contexts
  • Manipulating Policies
  • Access Vector
  • SELinux logs
  • Security Identifiers-SIDs
  • Statements: fs_use_* and genfscon
  • Context on network objects
  • Booleans: Creating and using new booleans
  • Examples: allow, auditallow,neverallow,dontaudit, can_exec
  • Enableaudit

Lab 7. Implementing User and Role Based Policy Restrictions, MCS and strict policy

Lab 8. Building Policies: Checking the current policy, Using sesearch to list the rules in a policy, audit2allow, type and typealias, type_transition, Using semanage and restorecond

Dag 4

  • Lab 9. Manipulating Policies
    • Restricting Access to ISO images
    • Making Squid listen to a non-standard port
    • Protecting a new script
  • Lab 10. Editing Policy:
    • Multi-domain File Contexts
    • Allowing httpd access to non-standard ports and exploring allow_ypbind
    • Boot problem
    • New file context for script.py
    • Customizable Types
  • Project
    • Beste praktyke
    • Overview of Changes
    • Task 1. Create File Contexts, Create File Types, Create File Typealiases
    • Task 2. Edit or Create Network Contexts
    • Task 3. Domains XCHARX Create Domains :Macros, Building and Enhancing

Kursus Tydsduur: 04 Dae

Skryf asseblief aan ons by info@itstechschool.com & kontak ons ​​by + 91-9870480053 vir die kursus prys en sertifiseringskoste, skedule en ligging

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