Dear friends

I am in the process of developing the portal so looking for a frame work which support portal and cms functionality ?I would like to know whether umbraco is supporing both prtal and cms functionality ? or i can integrate portal functionality to umbraco? Guide me regarding ths?

I need those Functionality of portal 

1. Role-based content delivery
2. Users were allowed to create their own pages or sites, to add collaboration apps to those pages and to define user access to those pages.
3. Power users with added features, such as web forms, workflows, dynamic lists and polls.

Please confirm weather we can manage this functionality with umbraco?