Description

This PR adds a new "ban" option to the fail2ban script. This allows to easily block custom IPs with fail2ban:

./setup.sh failban ban <IP>

The default bantime is 180 days, but can be adjusted easily like other fail2ban settings.

setup.sh: fail2ban was moved from the "debug" section to it's own fail2ban section:

setup.sh debug fail2ban --> setup.sh fail2ban

While adding the necessary changes to config-examples/fail2ban-jail.cf, I've also synced all values there, with our default settings.

A new fail2ban test was added and the existing ones were improved.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Improvement (non-breaking change that does improve existing functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation (README.md or the documentation under docs/)
• If necessary I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes