Kerberos 5 (krb5)

The rlm_krb5 FreeRADIUS module enables the use of Kerberos 5 for authentication.

Compilation issues

MIT libraries

The rlm_krb5 module, by default, presumes you have the MIT Kerberos 5 distribution. Notes from that distribution:

On linux, you may have to change:

deplibs_test_method="pass_all"

in ../libtool

Otherwise, it complains if the krb5 libs aren’t shared.

Heimdal libraries

If you are using the Heimdal Kerberos 5 distribution, pass an --enable-heimdal-krb5 option to configure.

Configuration parameters

You can configure the module with the following parameters:

krb5 {
    # Keytab containing the key used by rlm_krb5
    keytab = /path/to/keytab

    # Principal that is used by rlm_krb5
    service_principal = radius/some.host.com
}

Make sure the keytab is readable by the user that is used to run radiusd and that your authorization configuration really uses rlm_krb5 to do the authentication. You will need to add the following to the authenticate section of your radiusd.conf file:

Auth-Type Kerberos {
    krb5
}