We're moving our wifi infrastructure to an authenticated and encrypted ssid. At the moment it's hard to change our internal wifi password, because our door system depends on it. If you are not in our internal wifi you can't operate the door.

This is one reason why we want to use 802.1x with EAP-TTLS. Every member has it's own username/password combination which can be reset or changed through a webinterface. If a member quits the space, we just have to deactivate the account and the internal access is gone.

The other reason is: Every member has its own encrypted channel to our access points. In addition the member has the possibility to check, if the SSID can be trusted (avoid roque APs) with an ssl certificate


To check if you're connecting to the correct SSID, you can and should add the ssl certificate to your connection setting. You can download the SSL CA-Certificate (ZIP-File) from our Server.


NetworkManager (GUI)

  • Download the certificate
  • Select the "backspace 802.1x" network in your WiFi settings
  • Select the previously downloaded certificate
    Linux NetMan Certificate.png
  • Select "TTLS" and "PAP" as the authentication and inner authentication method, respectively (see below)
  • Fill in your username and password (see below)
    Linux NetMan Authentication.png

NetworkManager (nmcli)

# update your nickname and if you want change the cert path

# copy and paste this
curl -o "$cert" https://www.hackerspace-bamberg.de/bckspc-downloads/bckspc-ca.crt
device=$(nmcli d show | grep -B1 'GENERAL.TYPE.*wifi$' | head -n1 | cut -f2 -d: | xargs)
nmcli c add save yes \
  ifname "$device" \
  type wifi \
  con-name bckspc \
  ssid "backspace 802.1x" \
  802-1x.ca-cert "$cert" \
  802-1x.eap ttls \
  802-1x.identity "$nickname" \
  802-1x.phase2-auth pap \
  wifi-sec.key-mgmt wpa-eap

# to connect use your gui or this command
nmcli c up bckspc --ask


Save config as /etc/netctl/$interfacename-backspace_8021x. You have to restart netctl-auto (e.g. systemctl restart netctl-auto@$interface)

Description='backspace WPA2 802.1X'
ESSID="backspace 802.1x"
    'ssid="backspace 802.1x"'
    'proto=RSN WPA'

FYI: Replace the interface name according to your system


Add to /etc/wpa_supplicant/wpa_supplicant.conf:

 ssid="backspace 802.1x"



Name=backspace 802.1x
CACertFile = hash://server/sha256/3e8977b8a92cc0be99b940323a2125fc2032727074a282d066801ee9dc3a2d97

Sailfish OS

Tested and working

Put the following into /var/lib/connman/wifi_bckspc-8021x.config


systemctl restart connman

Type = wifi
Name = backspace 802.1x
EAP = ttls
Phase2 = PAP
Identity = USERNAME
Passphrase = PASSWORD
CACertFile = hash://server/sha256/3e8977b8a92cc0be99b940323a2125fc2032727074a282d066801ee9dc3a2d97


 ssid="backspace 802.1x"

Warning: This is not yet tested. ca_cert certificate checking should work as it does for netctl and wpa_supplicant. Adapted from 31c3 wiki


This is how you can connect with the android operating system to our 802.1x WIFI (WPA2 Enterprise)

  • Download our certificate (see top)
  • Open downloaded certificate
  • Save certificate as backspace.crt and type "Wifi"
  • Modify/Configure your backspace 802.1x connection according to the screenshot below
  • Attention: Some newer Android versions require a domain name if you use the certificate. Use radius.core.bckspc.de
  • Firefox on android might fail to import the certificate, stating that the certificate authority is already trusted. In these cases, chrome can stil import the certificate.

8021x-android-1.png 8021x-android-2.png 8021x-android-3.png 8021x-android-4.png

macOS and iOS

A ready profile file can be downloaded here (you need to provide your LDAP credentials when asked). You don't need to follow the other steps if you use this file. Note: For iOS you need to extract this ZIP file and send it to you phone (e.g. via email).

The following procedure has been tested using macOS 10.11 El Capitan to macOS 10.14 Mojave.

Earlier versions of macOS offered to specify the authentication protocol when connecting to a wireless network. However, in newer versions you'll have to install a configuration profile in order to connect to our network using 802.1X with EAP-TTLS/PAP. This configuration profile contains our certificate and all required settings.

It is fairly easy to generate a configuration file for your devices yourself with the added bonus of already including your username and password. This file can be used for all your Macs and iOS devices.

To generate the config file you need to download the Apple Configurator from the Mac App Store. [1]

Start the Configurator and choose File -> New Profile

In the General tab give the profile a name.

Then go down to Wi-Fi and configure the Payload:

SSID: backspace 802.1x
Security: Enterprise WPA2
you can add your username and password here
Inner Authentification: PAP

Choose Save from the File menu and give the profile a name.

You can now install the profile on your Mac. (The installation only seems to work, if you have installed the Certificate under "Certificates" in the Configurator. But you must not click the certificate under "Trust" in the Wi-Fi payload, because that will fail the authentification. See below for trusting the RADIUS server.)

To install the file on your iOS device, simply connect the device to the laptop running Configurator via USB and drag the profile file onto the device when it shows up in the application.

Alternatively you can send the file to yourself via email. Tap the file in the Mail app and install it on your iOS device. WARNING: This will likely send your credentials unencrypted through the internet!

When installing your profiles the systems will tell you that the certificate is not signed and that you need to trust the RADIUS server. You just need to accept both and are ready.

Windows 8 and above

Since Windows 8 the system itself is capable of EAP-TTLS.

TODO: Someone with windows should do some screenshots.