Rework the Security chapter.
Changes:
- Rework the Security Accounts section and put in there the sudo/doas section
- Rework the Intrusion Detection System using mtree
- Add new Secure levels section
- Add new File flags section
- Rework OpenSSH section
- Rework OpenSSL section
- Upgrade Access Control Lists section and add info about NFSv4 ACLs
- Add capsicum section with a brief introduction and a naive example
- Upgrade resource limits section
- Upgrade FreeBSD Security Advisories section showing a current report
Removed VPN over IPSec, I think this fits better in a separated article (new article) or in the network services chapter.
Output: https://www.carlavilla.es/freebsd/security.html