[sft server] Introduce ufw feature flags #40
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Defaults to being installed and configured.
Before, the listed ports would be opened regardless whether they are going to be used or not.
In some cases it's not determined whether IPv6 is enabled or not, when installing ufw. So, ufw may ends up with a broken configuration compared to the actual system state. This flag enables the user to 'manually' adjust ufw configuration if desired. Default: IPv6 enabled in ufw
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What's new in this PR?
Issues
Causes (Optional)
In a scenario with an external firewall, it might be desired to prevent a firewall from being installed on the same machine.
Solutions
Introduce feature flag to conditionally not install and configure a firewall
Testing
Applied to a test machine followed by a manual verification of the resulting state.
Notes (Optional)
This change set also includes a small change that only allows ingress on ports which are actually being used.