Docker! Skype! PulseAudio!

Run Skype inside an isolated Docker container on your Linux desktop! See its sights via X11 forwarding! Hear its sounds through the magic of PulseAudio and SSH tunnels!

Known Issue: While audio works flawlessly during calls and Skype is perfectly usable, the notification sounds such as call ringing do not work.

Docker index

The easiest method to get Skype in docker is to download the already prepared image from the official Docker image index repository: tomparys/skype. Follow further instructions there.

Building Instructions

In case you do not want to download the prepared image, you can built the image yourself using these following instructions.

1. Install PulseAudio Preferences. Debian/Ubuntu users can do this:

    sudo apt-get install paprefs
   

2. Launch PulseAudio Preferences, go to the "Network Server" tab, and check the "Enable network access to local sound devices" and "Don't require authentication" checkboxes

3. Restart PulseAudio

    sudo service pulseaudio restart
   

   or

    pulseaudio -k
    pulseaudio --start
   

   On some distributions, it may be necessary to completely restart your computer. You can confirm that the settings have successfully been applied using the pax11publish command. You should see something like this (the important part is in bold):

   Server: {ShortAlphanumericString}unix:/run/user/1000/pulse/native tcp:YourHostname:4713 tcp6:YourHostname:4713

   Cookie: ReallyLongAlphanumericString

4. Install Docker if you haven't already

5. Clone this repository and get right in there

    git clone https://github.com/tomparys/docker-skype-pulseaudio.git && cd docker-skype-pulseaudio
   

6. Build the container

    sudo docker build -t skype .
   

7. Create an entry in your .ssh/config file for easy access. It should look like this:

    Host docker-skype
      User      docker
      Port      55555
      HostName  127.0.0.1
      RemoteForward 64713 localhost:4713
      ForwardX11 yes
   

   (Optional) I recommend creating an SSH key without a password to be used to connect to this container. So in case you used a non-standard filename for your SSH key, add this:

      IdentityFile /path/to/your/ssh/key
   

8. Run the container and forward the appropriate port

    sudo docker run -d -p 55555:22 skype
   

9. (Optional) Copy an SSH public key

   If you plan to use an SSH key, copy the public key to the docker container using the following command. The password is docker.

    ssh-copy-id -i /path/to/your/public/key.pub docker-skype
   

10. Connect via SSH and launch Skype using the provided PulseAudio wrapper script

    ssh docker-skype skype-pulseaudio
    

    In case you didn't copy the SSH public key, the password is docker.

11. Go use Skype in a safe container!

Frequently Asked Questions

Why would I want to do this?

There are a couple of reasons you might want to restrict Skype's access to your computer:

• It is proprietary Microsoft software
• The skype binary is disguised against decompiling, so nobody is (still) able to reproduce what it really does.
• It produces encrypted traffic even when you are not actively using Skype.
• Skype vulnerability count and status is unclear at best (indicative incident)