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6.1 KiB
Markdown
157 lines
6.1 KiB
Markdown
---
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lang: en
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layout: doc
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permalink: /doc/how-to-use-usb-devices/
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redirect_from:
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- /doc/usb-devices/
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- /doc/usb/
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ref: 195
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title: How to Use USB Devices
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---
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*This page is part of [device handling in qubes](/doc/how-to-use-devices/).*
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If you are looking to handle USB *storage* devices (thumbdrives or USB-drives), please have a look at the [block device](/doc/how-to-use-block-storage-devices/) page.
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**Note:** Attaching USB devices to VMs requires a [USB qube](/doc/usb-qubes/).
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**Important security warning:** USB passthrough comes with many security implications.
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Please make sure you carefully read and understand the **[security considerations](/doc/device-handling-security/#usb-security)**.
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Whenever possible, attach a [block device](/doc/how-to-use-block-storage-devices/) instead.
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Examples of valid cases for USB-passthrough:
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- [microcontroller programming](https://www.arduino.cc/en/Main/Howto)
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- [external audio devices](/doc/external-audio/)
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- [optical drives](/doc/recording-optical-discs/) for recording
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(If you are thinking to use a two-factor-authentication device, [there is an app for that](/doc/u2f-proxy/).
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But it has some [issues](https://github.com/QubesOS/qubes-issues/issues/4661).)
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## Attaching And Detaching a USB Device
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### With Qubes Device Manager
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Click the device-manager-icon: 
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A list of available devices appears.
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USB-devices have a USB-icon to their right: 
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Hover on one device to display a list of VMs you may attach it to.
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Click one of those.
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The USB device will be attached to it.
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You're done.
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After you finished using the USB-device, you can detach it the same way by clicking on the Devices Widget.
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You will see an entry in bold for your device such as **`sys-usb:2-5 - 058f_USB_2.0_Camera`**.
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Hover on the attached device to display a list of running VMs.
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The one to which your device is connected will have an eject button  next to it.
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Click that and your device will be detached.
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### With The Command Line Tool
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In dom0, you can use `qvm-usb` from the commandline to attach and detach devices.
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Listing available USB devices:
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```shell_session
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[user@dom0 ~]$ qvm-usb
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BACKEND:DEVID DESCRIPTION USED BY
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sys-usb:2-4 04ca:300d 04ca_300d
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sys-usb:2-5 058f:3822 058f_USB_2.0_Camera
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sys-usb:2-1 03f0:0641 PixArt_HP_X1200_USB_Optical_Mouse
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```
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Attaching selected USB device:
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```shell_session
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[user@dom0 ~]$ qvm-usb attach work sys-usb:2-5
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[user@dom0 ~]$ qvm-usb
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BACKEND:DEVID DESCRIPTION USED BY
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sys-usb:2-4 04ca:300d 04ca_300d
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sys-usb:2-5 058f:3822 058f_USB_2.0_Camera work
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sys-usb:2-1 03f0:0641 PixArt_Optical_Mouse
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```
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Now, you can use your USB device (camera in this case) in the `work` qube.
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If you see the error `ERROR: qubes-usb-proxy not installed in the VM` instead, please refer to the [Installation Section](#installation-of-qubes-usb-proxy).
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When you finish, detach the device.
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```shell_session
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[user@dom0 ~]$ qvm-usb detach work sys-usb:2-5
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[user@dom0 ~]$ qvm-usb
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BACKEND:DEVID DESCRIPTION USED BY
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sys-usb:2-4 04ca:300d 04ca_300d
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sys-usb:2-5 058f:3822 058f_USB_2.0_Camera
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sys-usb:2-1 03f0:0641 PixArt_Optical_Mouse
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```
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## Maintenance And Customisation
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### Creating And Using a USB qube
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If you've selected to install a usb-qube during system installation, everything is already set up for you in `sys-usb`.
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If you've later decided to create a usb-qube, please follow [this guide](/doc/usb-qubes/).
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### Installation Of `qubes-usb-proxy`
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To use this feature, the `qubes-usb-proxy` package needs to be installed in the templates used for the USB qube and qubes you want to connect USB devices to.
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This section exists for reference or in case something broke and you need to reinstall `qubes-usb-proxy`.
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Under normal conditions, `qubes-usb-proxy` should already be installed and good to go.
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If you receive this error: `ERROR: qubes-usb-proxy not installed in the VM`, you can install the `qubes-usb-proxy` with the package manager in the VM you want to attach the USB device to.
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- Fedora: `sudo dnf install qubes-usb-proxy`
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- Debian/Ubuntu: `sudo apt-get install qubes-usb-proxy`
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### Using USB Keyboards And Other Input Devices
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**Warning:** especially keyboards need to be accepted by default when using them to login! Please make sure you carefully read and understood the **[security considerations](/doc/device-handling-security/#usb-security)** before continuing!
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Mouse and keyboard setup are part of [setting up a USB-qube](/doc/usb-qubes/#enable-a-usb-keyboard-for-login).
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### Finding The Right USB Controller
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Some USB devices are not compatible with the USB pass-through method Qubes employs.
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In situations like these, you can try to pass through the entire USB controller to a qube as PCI device.
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However, with this approach one cannot attach single USB devices but has to attach the whole USB controller with whatever USB devices are connected to it.
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If you have multiple USB controllers, you must first figure out which PCI device is the right controller.
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First, find out which USB bus the device is connected to (note that these steps need to be run from a terminal inside your USB qube):
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```
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lsusb
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```
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For example, I want to attach a broadband modem to the NetVM.
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In the output of `lsusb` it may be listed as something like:
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```
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Bus 003 Device 003: ID 413c:818d Dell Computer Corp.
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```
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(In this case, the device isn't fully identified)
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The device is connected to USB bus \#3.
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Check which other devices are connected to the same bus, since *all* of them will be attach to the same VM.
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To find the right controller, follow the usb bus:
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```
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readlink /sys/bus/usb/devices/usb3
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```
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This should output something like:
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```
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../../../devices/pci-0/pci0000:00/0000:00:1a.0/usb3
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```
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Now you see the path and the text between `/pci0000:00/0000:` and `/usb3` i.e. `00:1a.0` is the BDF address. Strip the address and pass it to the [`qvm-pci` tool](/doc/how-to-use-pci-devices/) to attach the controller to the targetVM.
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For example, On R 4.0 the command would look something like
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`qvm-pci attach --persistent personal dom0:00_1a.0`
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