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Troubleshooting SELinux

Mandatory access control (MAC) is an essential element to modern system security. SELinux is a common implementation of MAC that must be well understood by engineers in order to incorporate the most ideal security practices into production systems. This exercise delves into a common occurrence relating to MAC; troubleshooting a system that is experiencing errors as a consequence of SELinux. *This course is not approved or sponsored by Red Hat.*

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Path Info

Level
Clock icon Advanced
Duration
Clock icon 30m
Published
Clock icon Nov 05, 2018

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Table of Contents

  1. Challenge

    Verify there is an error by trying to access `localhost:80/index.html` using curl on the `www` host and check the audit log using sealert. Direct the output from sealert to `/home/cloud_user/seinfo.txt`.

    • Run curl localhost:80/index.html to confirm the error.
    • Run sealert -a /var/log/audit/audit.log > /home/cloud_user/seinfo.txt.

  2. Challenge

    Examine `/home/cloud_user/seinfo.txt` to figure out what is wrong and fix the error regarding `/var/www/html/index.html`.

    • Reviewing the seinfo.txt file should indicate the context for /var/www/html/index.html is incorrect.
    • Run restorecon /var/www/html/index.html to fix the issue.

  3. Challenge

    Restart `httpd` to check for other possible issues and correct any issues you might find.

    • Run systemctl restart httpd (note: httpd should fail to restart).
    • Based on journalctl --xe or by re-examining the audit log with sealert, you will see the file context is incorrect on /etc/httpd/conf/httpd.conf.
    • Run restorecon /etc/httpd/conf/httpd.conf to fix the context on httpd.conf.
    • Run systemctl start httpd and service should be restored.

  4. Challenge

    Confirm `localhost:80/index.html` loads correctly with curl on the `www` host.

    Run curl localhost:80/index.html and verify that you get the message "The website is up".

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Pluralsight Skills

Pluralsight Skills gives leaders confidence they have the skills needed to execute technology strategy. Technology teams can benchmark expertise across roles, speed up release cycles and build reliable, secure products. By leveraging our expert content, skill assessments and one-of-a-kind analytics, keep up with the pace of change, put the right people on the right projects and boost productivity. It's the most effective path to developing tech skills at scale.

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