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Passwordless root access in qubes
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=================================
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The rationale behind passwordless root in qubes is set out :doc:`here </user/security-in-qubes/vm-sudo>`. Implementation is by the qubes-core-agent-passwordless-root package.
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This page sets out the configuration changes made, with (not necessary complete) list of mechanisms depending on each of them:
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1. sudo (``/etc/sudoers.d/qubes``):
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.. code:: bash
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Defaults !requiretty
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%qubes ALL=(ALL) ROLE=unconfined_r TYPE=unconfined_t NOPASSWD: ALL
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(...)
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- Easy user -> root access (main option for the user).
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- ``qvm-usb`` (not really working, as of R2).
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2. PolicyKit (``/etc/polkit-1/rules.d/00-qubes-allow-all.rules``):
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.. code:: bash
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//allow any action, detailed reasoning in sudoers.d/qubes
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polkit.addRule(function(action,subject) { if (subject.isInGroup("qubes")) return polkit.Result.YES; });
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PAM (``/etc/pam.d/su.qubes`` or ``/usr/share/pam-configs/su.qubes``) ``auth sufficient pam_succeed_if.so use_uid user ingroup qubes``
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- NetworkManager configuration from normal user (``nm-applet``).
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- Updates installation (``gpk-update-viewer``).
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- 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.
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3. Empty root password:
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- Used for access to ‘root’ account from text console (``qvm-console-dispvm``) - the only way to access the VM when GUI isn’t working.
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- Can be used for easy ‘su -’ from user to root.
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