Requesters viewing their assets and contracts

I can't seem to identify how to allow requesters to log into the ServiceDesk interface and view the assets that they own and the current status of their contracts.

We have assigned assets to being owned by requester users, and want these users to be able to log in and see their assets, and see the status of their contracts on those assets.

I can't see how to do this, without creating a new role that permits this, however the roles don't appear to be able to be applied to the requesters, just technicians.

Given we have many companies that we deal with who have maintenance contracts through us, we would like them to have a fairly read only interface to see what we have on maintenance with them and when these contracts expire.

Is there an easy way to do this?