Qubes Overzicht

Qubes OS is an open-source operating system which uses the Xen hypervisor to provide strong security for desktop computing through isolated qubes, (which are Virtual Machines). You can assign each qube a level of trust based on its purpose. Qubes OS provides security by using isolation. It only permits actions on a per-case basis and therefore is the opposite of badness enumeration.

Hoe werkt Qubes OS?

Qubes uses compartmentalization to keep the system secure. Qubes worden aangemaakt op basis van sjablonen, waarbij de standaard opties Fedora, Debian en Whonixzijn. Qubes OS also allows you to create once-use disposable qubes.

The term qubes is gradually being updated to avoid referring to them as "virtual machines".

Some of the information here and on the Qubes OS documentation may contain conflicting language as the "appVM" term is gradually being changed to "qube". Qubes are not entire virtual machines, but maintain similar functionalities to VMs.

Qubes Architectuur, Krediet: Wat is Qubes OS Intro

Each qube has a colored border that can help you keep track of the domain in which it runs. Je kunt bijvoorbeeld een specifieke kleur gebruiken voor jouw bankbrowser, en een andere kleur voor een algemene niet-vertrouwde browser.

Qubes vensterranden, krediet: Qubes Screenshots

Waarom zou ik Qubes gebruiken?

Qubes OS is useful if your threat model requires strong security and isolation, such as if you think you'll be opening untrusted files from untrusted sources. A typical reason for using Qubes OS is to open documents from unknown sources, but the idea is that if a single qube is compromised it won't affect the rest of the system.

Qubes OS utilizes dom0 Xen VM for controlling other qubes on the host OS, all of which display individual application windows within dom0's desktop environment. There are many uses for this type of architecture. Here are some tasks you can perform. You can see just how much more secure these processes are made by incorporating multiple steps.

Tekst kopiëren en plakken

You can copy and paste text using qvm-copy-to-vm or the below instructions:

1. Press Ctrl+C to tell the qube you're in that you want to copy something.
2. Press Ctrl+Shift+C to tell the qube to make this buffer available to the global clipboard.
3. Press Ctrl+Shift+V in the destination qube to make the global clipboard available.
4. Press Ctrl+V in the destination qube to paste the contents in the buffer.

Bestandsuitwisseling

To copy and paste files and directories (folders) from one qube to another, you can use the option Copy to Other AppVM... or Move to Other AppVM.... Het verschil is dat de optie Verplaatsen het oorspronkelijke bestand verwijdert. Either option will protect your clipboard from being leaked to any other qubes. This is more secure than air-gapped file transfer. An air-gapped computer will still be forced to parse partitions or file systems. Dat is niet nodig met het inter-qube kopieersysteem.

Qubes do not have their own filesystems.

You can copy and move files between qubes. Daarbij worden de wijzigingen niet onmiddellijk aangebracht en kunnen ze bij een ongeval gemakkelijk ongedaan worden gemaakt. When you run a qube, it does not have a persistent filesystem. You can create and delete files, but these changes are ephemeral.

Inter-VM Interacties

The qrexec framework is a core part of Qubes which allows communication between domains. It is built on top of the Xen library vchan, which facilitates isolation through policies.

Connecting to Tor via a VPN

We recommend connecting to the Tor network via a VPN provider, and luckily Qubes makes this easy to do with a combination of ProxyVMs and Whonix.

After creating a new ProxyVM which connects to the VPN of your choice, you can chain your Whonix qubes to that ProxyVM before they connect to the Tor network, by setting the NetVM of your Whonix Gateway (sys-whonix) to the newly-created ProxyVM.

Your qubes should be configured in a manner similar to this:

Qube name	Qube description	NetVM
sys-net	Your default network qube (pre-installed)	n/a
sys-firewall	Your default firewall qube (pre-installed)	sys-net
sys-proxyvm	The VPN ProxyVM you created	sys-firewall
sys-whonix	Your Whonix Gateway VM	sys-proxyvm
anon-whonix	Your Whonix Workstation VM	sys-whonix

Extra bronnen

For additional information we encourage you to consult the extensive Qubes OS documentation pages located on the Qubes OS Website. Offline kopieën kunnen worden gedownload van het Qubes OS documentatie archief.

• Arguably the world's most secure operating system (Open Technology Fund)
• Software compartmentalization vs. physical separation (J. Rutkowska)
• Partitioning my digital life into security domains (J. Rutkowska)
• Related Articles (Qubes OS)

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