APEX

Hi. Apex 2.2.1. I'm going crazy trying to set up authentication for my application. I'd appreciate any pointers. My scenario is

Siteminder intercepts all calls to the application
User authenticates with Siteminder
If authenticated, Siteminder sets HTTP_SM_USER in the header
If not authenticated, then APEX is never called
Pull the user out of the header
Create a session if needed
Log the user in if needed
Redirect the user to the request page

I've followed the example that I've found in the forum and set up a page sentry function to create a session when the user first comes in. After that I try to verify that the session belongs to them. That's not working because wwv_flow_custom_auth_std.get_username never returns a value. I think that's because I'm not logging the user in to APEX. I can't figure out the difference between wwv_flow_custom_auth_std.post_login and wwv_flow_custom_auth_std.login. (it probably doesn't help that I inherited the application from some consultants that left a year ago and there is no documentation on it or even APEX here at my site).

Mike