[CalendarServer-users] CalendarServer + LDAP on linux

Hi, I've just installed calendarserver on my ubuntu server and using the account.xml file for authentication everythink is ok. Now I would like to connect calendarserver to my OpenLDAP server hosted on ubuntu. My OpenLDAP server has the same schema as OpenDirectory and I manage my users/groups from my Mac using WorgroupManager from Apple. So I should have everythink in place on LDAP side. Is there a solution to connect calendarserver to LDAP ? From what I read opendirectory module doesn't exist on linux. Thank you in advance for your help Xavier