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qubes-doc/developer/system/vm-sudo.md

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en doc /doc/vm-sudo-implementation/
/en/doc/vm-sudo-implementation/
/doc/VMSudo-implementation/
341 Passwordless root access in qubes

The rationale behind passwordless root in qubes is set out here. Implementation is by the qubes-core-agent-passwordless-root package.

This page sets out the configuration changes made, with (not necessary complete) list of mechanisms depending on each of them:

  1. sudo (/etc/sudoers.d/qubes):

    Defaults !requiretty
%qubes ALL=(ALL) ROLE=unconfined_r TYPE=unconfined_t NOPASSWD: ALL

(...)
    • Easy user -> root access (main option for the user).
    • qvm-usb (not really working, as of R2).

  2. PolicyKit (/etc/polkit-1/rules.d/00-qubes-allow-all.rules):

    //allow any action, detailed reasoning in sudoers.d/qubes
polkit.addRule(function(action,subject) { if (subject.isInGroup("qubes")) return polkit.Result.YES; });

    PAM (/etc/pam.d/su.qubes or /usr/share/pam-configs/su.qubes)

    auth    	sufficient	pam_succeed_if.so use_uid user ingroup qubes
    • NetworkManager configuration from normal user (nm-applet).
    • Updates installation (gpk-update-viewer).
    • User can use pkexec just like sudo Note: above is needed mostly because Qubes user GUI session isn't treated by PolicyKit/logind as "local" session because of the way in which X server and session is started. Perhaps we will address this issue in the future, but this is really low priority. Patches welcomed anyway.

  3. Empty root password:

    • Used for access to 'root' account from text console (qvm-console-dispvm) - the only way to access the VM when GUI isn't working.
    • Can be used for easy 'su -' from user to root.