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Produktlogo UCS Version 3.2


Available in AppCenter Button 200.png

The RADIUS app increases the security for UCS managed IT infrastructures by controlling the access to the wireless network for users, groups and endpoint devices via RADIUS protocol. The configuration is done via black and white lists and directly at user, group and endpoint device objects in the UCS management system. Registered users are authenticated with their usual domain credentials, which, among others, also allows bring your own device concepts.


RADIUS is available through the App Center and can be installed using the corresponding UMC App Center module. It can be installed on multiple machines. After the installation it runs a freeRADIUS server. Clients (e.g. access points) can contact via RADIUS to check network access requests.

The RADIUS app can also be installed on UCS@school systems. In this case, the network access can be given to users or groups regardless of the Internet rule or computer room settings.


Allowed users

Group Access Example

By default no user is allowed to access the network. Enabling the checkbox for network access on the RADIUS tab, gives the user access to the network. The checkbox can also be set on groups, which allows all users in this group access.

MAC filtering

By default access to the network is allowed for every device (assuming the used user name has access). It can be restricted to only allow specific devices. This can be enabled by setting the UCR variable radius/mac/whitelisting to true. When enabled, the device used to access the network is looked up via the LDAP attribute macAddress and the resulting computer object must have network access granted (either directly or via one of its groups) too.

Access Points

All access points must be registered in the configuration file /etc/freeradius/clients.conf. For each access point a random password should be created. (For example using the command makepasswd). The shortname can be chosen at will. Example entry for an access point:

client {
    secret = a9RPAeVG
    shortname = AP01

The access points must then be configured to use 802.1x ("WPA Enterprise") authentication; The address of the server where the RADIUS app is installed should be set as "RADIUS server" and the password must be set to the "secret" from the clients.conf entry for that access point.


WiFi-clients have to be configured to use WPA with PEAP and MSCHAPv2 for authentication.

See for example the configuration for Windows or the configuration for Android.


The tool univention-radius-check-access can be used to evaluate the current access policy for a given user and/or station ID (MAC address). It can be executed as root on the server where univention-radius is installed:

root@master211:~# univention-radius-check-access --username=stefan
DENY 'uid=stefan,cn=users,dc=ucs,dc=local'
-> DENY 'cn=Domain Users,cn=groups,dc=ucs,dc=local'
-> 'cn=Domain Users,cn=groups,dc=ucs,dc=local'
-> -> DENY 'cn=Users,cn=Builtin,dc=ucs,dc=local'
-> -> 'cn=Users,cn=Builtin,dc=ucs,dc=local'
Thus access is DENIED.
root@master211:~# univention-radius-check-access --username=janek
DENY 'uid=janek,cn=users,dc=ucs,dc=local'
-> DENY 'cn=Domain Users,cn=groups,dc=ucs,dc=local'
-> ALLOW 'cn=Network Access,cn=groups,dc=ucs,dc=local'
-> 'cn=Domain Users,cn=groups,dc=ucs,dc=local'
-> -> DENY 'cn=Users,cn=Builtin,dc=ucs,dc=local'
-> -> 'cn=Users,cn=Builtin,dc=ucs,dc=local'
-> 'cn=Network Access,cn=groups,dc=ucs,dc=local'
Thus access is ALLOWED.

It prints a detailed explanation and sets the exit code depending on the access (0 for granted access, 1 for denied access)


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