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SELinux Learning Activity

In this lab we'll use SELinux to resolve a scenario that is common in the real world. Doing this will help to understand the tools available and where to look when troubleshooting SELinux issues. *This course is not approved or sponsored by Red Hat.*

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Path Info

Level
Clock icon Intermediate
Duration
Clock icon 30m
Last updated
Clock icon Aug 29, 2025

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Table of Contents

  1. Challenge

    Fix the Selinux Permissions on `/opt/website` so That They'll Survive a Relabel

    • First we'll check to see what the label needs to be. Websites are normally stored in /var/www/html so we can look there to see what it should be.
    • We can see that the context should be set to httpd_sys_content_t.
    • The command we need to run is: semanage fcontext -a -t httpd_sys_content_t '/opt/website(/.*)?'
    • This makes a change in the SELinux database.
    • We then need to run restorecon /opt/website to actually make the change on the filesystem.
    • This will set the directory to the correct context and protect that change from a relabel in the future.

  2. Challenge

    Deploy the Website as Instructed and Test It

    • We've been instructed to deploy the website by running mv /root/index.html /opt/website/.
    • We can then try a curl localhost/index.html to test our deploy.
    • If we get a 403 Forbidden error, test if SELinux is the problem by running setenforce 0 and then running curl again.
    • If the curl works with SELinux in permissive mode, we can set it back to enforcing with setenforce 1 and then investigate why.

  3. Challenge

    Resolve the Error When Trying to Access `/opt/website/index.html`

    • ls -lZ /opt/website will show that index.html has a content type of admin_home_t which isn't what we need when serving webpages.
    • We can run restorecon /opt/website/index.html to fix this error and the curl will work.
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