3.1 KiB
sys-print
Printer environment in Qubes OS.
Table of Contents
Description
Creates a print server named "sys-print" and a named disposable "disp-sys-print" qube for sending files to your configured printer, which can be done over the network or with IPP-over-USB.
Security
The client does not have CUPS, does not need internet connection and does not have USB devices connected.
Using CUPS in a dedicated qube reduces attack surface and has a better usability as you only need to configure the printer in one qube and other qubes will have access through Qrexec.
If the devices connected to the server qube can attack the CUPS server, it can escalate the attack to the client qube. Usage of disposables servers does not prevent this from happening, it just avoids persistent infection on the server, where you could attribute different printers to different levels of trust.
Sending files to the print server with qvm-copy is always safer than
allowing a direct connection from the qube that wants to print files to the
qube that has access to the printer.
Installation
- Top:
sudo qubesctl top.enable sys-print
sudo qubesctl --targets=tpl-sys-print,sys-print state.apply
sudo qubesctl top.disable sys-print
sudo qubesctl state.apply sys-print.appmenus
- State:
sudo qubesctl state.apply sys-print.create
sudo qubesctl --skip-dom0 --targets=tpl-sys-print state.apply sys-print.install
sudo qubesctl --skip-dom0 --targets=dvm-sys-print,sys-print state.apply sys-print.configure
sudo qubesctl state.apply sys-print.appmenus
If you want to install all printer drivers:
sudo qubesctl --skip-dom0 --targets=tpl-sys-print state.apply sys-print.install-driver-all
On the client template:
sudo qubesctl --skip-dom0 --targets=tpl-QUBE state.apply sys-print.install-client
The client qube requires the split Print service to be enabled:
qvm-features QUBE service.print-setup 1
Access Control
Default policy: ask all requests requesting to use the
qusal.Print RPC service.
Asking can spawn multiple requests depending on the client, usage of allow
is recommended for trusted clients.
Allow access to the specified printing agent based on the qube tag:
qusal.Print * @tag:print-client @default allow target=sys-print
Always recommended to end with an explicit deny rule:
qusal.Print * @anyvm @anyvm deny
Usage
Add a printer
You will configure your printer from sys-print or disp-sys-print, it can
connect over the network or USB. If you do not want to save printing
configuration, use disp-sys-print.
On sys-print or disp-sys-print, add your printer:
system-config-printer
On the client, select the file to print, open it with an editor, viewer or browser and target the desired printer.