[Openswan Users] L2TP over IPsec Certificate/Smartcard Authentication

[Артём Конвалюк]

Hello everyone! I need to use L2TP/IPsec server for roaming users with
certificate or smartcard authentication (from Window XP/7
client-side). I mean that there shouldn't be any login/password
combination. Client should press "Connect" button, choose certificate
(or enter PIN for smartcard) and that is all.
Is there any possibilities to do this with xl2tpd + OpenSwan?
Could anybody help?