Lab
A Cloud Guru

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.*

Try for free Contact sales

Path Info

Level

Intermediate

Duration

30m

Published

May 17, 2019

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.
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.
Challenge

Put SELinux into enforcing mode and ensure that setting is persistent
1. Check SELinux state:
```
getenforce
```
- 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:
```
getenforce
```
- We can see our change worked and SELinux is now in enforcing mode.
1. Ensure SELinux boots into enforcing mode:
```
vi /etc/selinux/config
```
```
SELINUX=enforcing
```

Author

A Cloud Guru

The Cloud Content team comprises subject matter experts hyper focused on services offered by the leading cloud vendors (AWS, GCP, and Azure), as well as cloud-related technologies such as Linux and DevOps. The team is thrilled to share their knowledge to help you build modern tech solutions from the ground up, secure and optimize your environments, and so much more!

What's a lab?

Hands-on Labs are real environments created by industry experts to help you learn. These environments help you gain knowledge and experience, practice without compromising your system, test without risk, destroy without fear, and let you learn from your mistakes. Hands-on Labs: practice your skills before delivering in the real world.