Allow end-users to customize GUI event buffering in Qube Manager

[ArrayBolt3]

How to file a helpful issue

The problem you're addressing (if any)

Event buffering is now a feature of the GUI daemon, which can be set by modifying the gui-events-max-delay feature for any qube that uses the GUI daemon. Currently this feature can only be used by advanced users who know where to find the documentation for the feature (a blurb in /etc/qubes/guid.conf, which isn't even used by the GUI daemon anymore) and who are willing to fiddle with the qvm-features command in a Dom0 terminal. Whonix-Workstation VMs will hopefully come with the feature set to a reasonable default value of 100 ms once QubesOS/qubes-core-admin-addon-whonix#20 is merged, but just like kloak (the application that inspired the event buffering feature) is useful outside of Whonix, event buffering may be useful as well. Users need to be able to know the feature exists and how to configure it in order to use it.

The solution you'd like

We should provide some easy way to configure this setting, perhaps in Qube Manager.

The value to a user and who that user might be

Users can obfuscate keyboard rhythm biometrics from any VMs they want, regardless of OS, so long as they can interface with the GUI daemon.

Completion criteria checklist

(This section is for developer use only. Please do not modify it.)

[alimirjamali]

Some notes on where showing this setting might be meaningful and where it would be most probably meaningless:

• Valid for Whonix Workstation based qubes (qubes with `anon-vm`` tag).
• Invalid for networkless qubes (TemplatesVMs, Vault, sys-usb, sys-audio, ...).
• Gray area for sys-net and sys-firewall? Even sys-whonix?

[adrelanos]

Why this ticket has been created:

• This ticket has (probably) been created to keep it separate from Enable X11 event buffering in Whonix by default #9771, since this is a separate feature request.

Status:

• No Whonix developer currently has the intention to implement this.

Reasons:

• Once Enable X11 event buffering in Whonix by default #9771 is implemented, a reasonable default for all users will be used in Qubes R4.3 and above. The more users share the same setting, the better. (Anonymity loves company.)
• Creating a GUI setting for this specifically is not justified. There are thousands of settings in Tor and Linux generally that users could modify. There is no need to specifically focus on this one.

Outlook:

• Should anyone feel strongly about this and contribute the code to implement it, that would be OK, subject to acceptance by Qubes.