Using DNN's Authentication + Active Directory module, is it possible to create a System.Net.NetworkCredentials() object for the logged in user?

The issue we're currently facing is we're trying to integrate DNN and SSRS.  Both are using Active Directory on their own.  But, now as we try to mash them together, we want the user who is logged into DNN to access SSRS.  We managed to write it so that a service account can be the glue between them, but then our SSRS reports don't know who the user is, and we can't have user aware reports.  I tried looking through the source code for the AD module, but the only source I could find is just a few bare aspx pages and a DLL.

Can someone help point me in the right direction?