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Creating Confined Users in SELinux

In this lab, we'll create an SELinux confined user by mapping an SELinux user to a Linux user. Confined users help us to impart restrictions on users to help protect our systems. *This course is not approved or sponsored by Red Hat.*

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Path Info

Clock icon Intermediate
Clock icon 30m
Clock icon May 17, 2019

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Table of Contents

  1. Challenge

    Map Linux users jhalpert and pbeesley to SELinux users

    1. Map Linux user jhalpert to SELinux user user_u:
    semanage login -a -s user_u jhalpert
    1. Map Linux user pbeesly to SELinux user staff_u:
    semanage login -a -s staff_u pbeesley  
    1. Check the user mappings:
    semanage login -l  
    • We can see our Linux users successfully mapped to the assigned SELinux users.
  2. Challenge

    Ensure the SELinux user `xguest` can not mount media

    1. Check SELinux booleans for "xguest":
    getsebool -a | grep xguest
    • We see "xguest_mount_media" is an option and it is enabled, so lets disable it.
    1. Disable SELinux boolean "xguest_mount_media":
    setsebool -P xguest_mount_media off
    1. Check to make sure our changes were successful:
    getsebool -a | grep xguest
    • We can see our change was successful.
  3. Challenge

    Put SELinux into enforcing mode and ensure that setting is persistent

    1. Check SELinux state:
    • It is in permissive mode, so we need to change it to enforcing mode.
    1. Put SELinux into enforcing mode:
    setenforce 1  
    1. Check to make sure SELinux is now in enforcing mode:
    • We can see our change worked and SELinux is now in enforcing mode.
    1. Ensure SELinux boots into enforcing mode:
    vi /etc/selinux/config

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