SSO drupal + domino

Hi,

we have a drupal website running on Linux+Apache+Mysql and several other websites running on Domino. We need single sign-on for all those systems (the websites on Domino have SSO already). I know only about modules for sharing user login infromation (ldap_integration), but we need to allow people log in once and access all the sites. Also the access to particular pages, forums etc. should be restricted based on user access rights.

I know Apache and Domino can be used together to get similar behaviour, but I think the access control is then based on (user,url mask) pair, e.g. only users from group A can access urls of the form /restricted-for-A/something.html . But then how to allow for some dynamic access control, e.g. to allow users to restrict access to their own forums to some particular set of usernames?

Any suggestions?

We would like to avoid modifying the drupal code (we are afraid of future drupal upgrades and need for additional changes) - is there some module available that we can use? (I didn't find any)

Thank you in advance.

Petr

P.S.: If you know of some paid solution or would like to be paid for help with this problem, do not hesitate to contact me as well.