KRB5_KDB_SK_REQUIRE_AUTH
ret = krb5_dbe_get_string(context, server, KRB5_KDB_SK_REQUIRE_AUTH, &str);
ret = krb5_dbe_set_string(context, entry, KRB5_KDB_SK_REQUIRE_AUTH,
ret = krb5_dbe_get_string(context, entry, KRB5_KDB_SK_REQUIRE_AUTH,