[Bug 1882098] Re: Packagekit lets user install untrusted local packages in Bionic and Focal

[Seth Arnold]

Hello Sami, Esko,

I'm not very familiar with the packagekit or policykit frameworks, so
please forgive me if I'm far off course here with these thoughts:

- Is the [tld.univ.packagekit-deny] rule necessary? I'd hope that this
permission wouldn't be granted to anyone but admins.

- Are there other rules in other files that might have granted this
permission?

- Does it matter if the test users are in no groups? just their own
username-group? adm? sudo?

- Does polkit or packagekit have a way to see which rules allow or deny
any given request?

Thanks

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https://bugs.launchpad.net/bugs/1882098

Title:
  Packagekit lets user install untrusted local packages in Bionic and
  Focal

Status in packagekit package in Ubuntu:
  New

Bug description:
  We have packagekit configured to allow users to install trusted
  packages from preconfigured repositories, but disallowed them to
  install any untrusted packages.

  The policykit configuration we use is following:

  [tld.univ.packagekit]
  Identity=unix-group:adm;
  Action=org.freedesktop.packagekit.package-install;org.freedesktop.packagekit.package-reinstall;org.freedesktop.packagekit.package-remove;org.freedesktop.packagekit.system-sources-refresh;org.freedesktop.packagekit.system-update;org.freedesktop.packagekit.repair-system;
  ResultAny=auth_self
  ResultActive=auth_self
  ResultInactive=auth_self

  [tld.univ.packagekit-deny]
  Identity=unix-user:*;
  Action=org.freedesktop.packagekit.package-install-untrusted;
  ResultAny=no

  We would expect this to prevent users from installing local packages
  downloaded from random repositories, however this does not seem to be
  the case.

  pkcon install-local random_package.deb will happily prompt for the
  user to authenticate and will install the package, while pkcon
  --allow-untrusted install-local random_package.deb will prompt for
  root password, which the user does not have.

  Our initial toughts was that the issue would be in packagekitd, but
  after further investigations it looks like the issue could be in aptcc
  backend.

  We are more than happy to provide you with further details, but the
  above should be enough to reproduce the issue.

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