Kerberos

Configuration is the same for heimdal or mit-krb5.

File: /etc/krb5.conf

[libdefaults]
        ticket_lifetime = 600
        default_realm = YOURDOMAIN.LOCAL

[realms]
        YOURDOMAIN.LOCAL = {
                kdc = domaincontroller.yourdomain.local:88
                admin_server = domaincontroller.yourdomain.local:464
        }

[domain_realm]
        .yourdomain.local = YOURDOMAIN.LOCAL

#[kdc]
#        profile = /etc/krb5kdc/kdc.conf
#
#[logging]
#        default = SYSLOG:NOTICE:DAEMON
#        kdc = FILE:/var/log/krb5kdc.log
#        admin_server = FILE:/var/log/kadmin.log
#        default = FILE:/var/log/krb5lib.log