/usr/share/gosa/plugins/ is in gosa-plugin-mit-krb5 2.7.4+reloaded2-13+deb9u1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/gosa/plugins/admin/
/usr/share/gosa/plugins/admin/systems/
/usr/share/gosa/plugins/admin/systems/services/
/usr/share/gosa/plugins/admin/systems/services/kerberos/
/usr/share/gosa/plugins/admin/systems/services/kerberos/class_goKrbServer.inc
/usr/share/gosa/plugins/admin/systems/services/kerberos/class_krb5_policy.inc
/usr/share/gosa/plugins/admin/systems/services/kerberos/class_krb_host_keys.inc
/usr/share/gosa/plugins/admin/systems/services/kerberos/class_password-methods-MIT.inc
/usr/share/gosa/plugins/admin/systems/services/kerberos/goKrbServer.tpl
/usr/share/gosa/plugins/admin/systems/services/kerberos/krb5_policy.tpl
/usr/share/gosa/plugins/admin/systems/services/kerberos/krb_host_keys.tpl
/usr/share/gosa/plugins/admin/systems/services/kerberos/pwd_kerberos_mit.tpl