---
title: "Qubes Übersicht"
icon: simple/qubesos
description: Qubes ist ein Betriebssystem, das auf der Isolierung von Anwendungen innerhalb von *qubes* (früher "VMs") basiert, um die Sicherheit zu erhöhen.
---

[**Qubes OS**](../desktop.md#qubes-os) ist ein Open-Source-Betriebssystem, das den [Xen-Hypervisor](https://en.wikipedia.org/wiki/Xen) nutzt, um durch isolierte *Qubes*(virtuelle Maschinen) starke Sicherheit für Desktop-Computing zu bieten. Du kannst jeden *qube* eine Vertrauensstufe zuweisen, die auf seinem Zweck basiert. Qubes OS bietet Sicherheit durch Isolation. It only permits actions on a per-case basis and therefore is the opposite of [badness enumeration](https://ranum.com/security/computer_security/editorials/dumb).

## Wie funktioniert Qubes OS?

Qubes uses [compartmentalization](https://qubes-os.org/intro) to keep the system secure. Qubes are created from templates, the defaults being for Fedora, Debian and [Whonix](../desktop.md#whonix). Qubes OS also allows you to create once-use [disposable](https://qubes-os.org/doc/how-to-use-disposables) *qubes*.

<details class="note" markdown>
<summary>Der Begriff <em>qubes</em> wird nach und nach aktualisiert, um die Bezeichnung "virtuelle Maschinen" zu vermeiden.</summary>

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.

</details>

![Qubes architecture](../assets/img/qubes/qubes-trust-level-architecture.png)
<figcaption>Qubes Architecture, Credit: What is Qubes OS Intro</figcaption>

Each qube has a [colored border](https://qubes-os.org/screenshots) that can help you keep track of the domain in which it runs. You could, for example, use a specific color for your banking browser, while using a different color for a general untrusted browser.

![Colored border](../assets/img/qubes/r4.0-xfce-three-domains-at-work.png)
<figcaption>Qubes window borders, Credit: Qubes Screenshots</figcaption>

## Warum sollte ich Qubes verwenden?

Qubes OS is useful if your [threat model](../basics/threat-modeling.md) 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](https://wiki.xenproject.org/wiki/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.

### Kopieren und Einfügen von Text

You can [copy and paste text](https://qubes-os.org/doc/how-to-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.

### File Exchange

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...**. The difference is that the **Move** option will delete the original file. 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. That is not required with the inter-qube copy system.

<details class="note" markdown>
<summary>Qubes do not have their own filesystems.</summary>

You can [copy and move files](https://qubes-os.org/doc/how-to-copy-and-move-files) between *qubes*. When doing so the changes aren't immediately made and can be easily undone in case of an accident. When you run a *qube*, it does not have a persistent filesystem. You can create and delete files, but these changes are ephemeral.

</details>

### Inter-VM Interactions

The [qrexec framework](https://qubes-os.org/doc/qrexec) 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](https://qubes-os.org/news/2020/06/22/new-qrexec-policy-system).

## Connecting to Tor via a VPN

We [recommend](../advanced/tor-overview.md) connecting to the Tor network via a [VPN](../vpn.md) provider, and luckily Qubes makes this easy to do with a combination of ProxyVMs and Whonix.

After [creating a new ProxyVM](https://forum.qubes-os.org/t/configuring-a-proxyvm-vpn-gateway/19061) 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](https://forum.qubes-os.org/t/configuring-a-proxyvm-vpn-gateway/19061) | sys-firewall    |
| sys-whonix      | Your Whonix Gateway VM                                                                              | ==sys-proxyvm== |
| anon-whonix     | Your Whonix Workstation VM                                                                          | sys-whonix      |

## Zusätzliche Ressourcen

Für zusätzliche Informationen empfehlen wir dir, die umfangreichen Qubes OS-Dokumentation auf der [Qubes OS-Website](https://qubes-os.org/doc) zu konsultieren. Offline-Kopien können aus dem Qubes OS [Dokumentations-Repository](https://github.com/QubesOS/qubes-doc) heruntergeladen werden.

- [Arguably the world's most secure operating system](https://opentech.fund/news/qubes-os-arguably-the-worlds-most-secure-operating-system-motherboard) (Open Technology Fund)
- [Software compartmentalization vs. physical separation](https://invisiblethingslab.com/resources/2014/Software_compartmentalization_vs_physical_separation.pdf) (J. Rutkowska)
- [Partitioning my digital life into security domains](https://blog.invisiblethings.org/2011/03/13/partitioning-my-digital-life-into.html) (J. Rutkowska)
- [Related Articles](https://qubes-os.org/news/categories/#articles) (Qubes OS)
