In this chapter, we looked at a number of SELinux use cases and tuned the system to use SELinux capabilities to enhance the security of the services.
For the web server, we architected the entire setup to manage the different risk profiles of the websites across multiple systems, tuning SELinux on each of those systems. We saw how multiple instances can be started, each with its own category set, and how their content can be managed in a secure manner. We also saw how to differentiate between administrative roles for the same system, and we finished with network-related tunings.
Next, we saw how a shell-service-providing server can be hardened further, splitting the SSH daemon for two different purposes and running both with a different category set. We looked at fine-tuning the file system for chrooted access, and we even used a customized login so that a user receives a different SELinux context based on the SSH instance he (or she) logs in through.
Finally, we looked at an NFS server...