Reporting Services uses a role-based security model to control access to reports, folders, and other items that are managed by a report server.
The followings Types of role can be defined by using report manager for a SSRS Items.
May view folders, reports and subscribe to reports.
May publish reports and linked reports; manage folders, reports and resources in a user's My Reports folder.
May publish reports and linked reports to the Report Server.
May view report definitions.