On Wed, Feb 16, 2022 at 12:14 PM Ben Cotton <bcot...@redhat.com> wrote:

> https://fedoraproject.org/wiki/Changes/polkit_recommends_pkla_pkexec
> [..]
> `pkexec` and `pkla-compat`
> ([https://src.fedoraproject.org/rpms/polkit-pkla-compat package]) are
> legacy tools that are no longer needed on a desktop and increase the
> attack surface as they are SetUID binaries (`pkexec`) or not
> maintained anymore (`pkla-compat`).


For pkexec, "no longer needed on a desktop" definitely does not reflect the
situation for Fedora Workstation and GNOME. If you run:

 grep org.freedesktop.policykit.exec.path /usr/share/polkit-1/actions/*

there is considerable usage - there are config files using pkexec provided
by, among others:

 gamemode, fedora-third-party, systemd, gnome-control-center,
gnome-system-monitor, gnome-settings-daemon, gvfs,

Would it be possible to rewrite all of the usage as D-Bus services? Yes -
but it would be considerable work and risk of new bugs and regressions.
(fedora-third-party is a recent addition by me - I considered not using
pkexec and writing a service instead, but it seemed like extra work and
complexity for little gain.)

If KDE or another desktop doesn't use pkexec, and there's a desire to split
pkexec out in packaging and add explicit dependencies on it, I'm not
opposed to that, but I don't think we should be calling pkexec legacy, and
it would require considerable (upstream, not just Fedora) changes to remove
the usage in Workstation.

- Owen
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