Third party system login page instead of apex login page

Question

Hello,
One of my customers wants to login into an apex application using their intranet page. This page has two text fields:
username and
password
and a login button.
There is no validation done at their side. The goal is to pass this information to apex and apex needs to check if this information is correct (checking against own user tables) and let the user into the application or refuse an access. I am thinking about the best way to do that. Is there anyone out there with some similar experience?
Denes Kubicek
http://deneskubicek.blogspot.com/
http://www.opal-consulting.de/training
http://apex.oracle.com/pls/otn/f?p=31517:1
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Answer 1

Have a look SOLVED: Automatic Login but only if a user is an Oracle User
Well I effectively do this with our Java application calling an APEX reporting application.
The trick is to get apex to automatically submit the login page without the user having to pressing the login button.
Once this works, the rest is fairly straightforward.
Effectively what happens is our java application calls a procedure which populates a table with
a username, encrypted password and a checkvalue (randomly generated), and returns the checkvalue to the calling procedure.
We also have the bones of the URL in a properties file.
The login page reads the value of the checkvalue from the URL in teh html header using various bits of javascript.
We have a before header process on the apex login page which reads the information from the table
table (and deletes it as soon as it reads it).
It then uses the username, and password obtained from the table and just passes these values to the wwv_flow_custom_auth_std.login procedure.
I can email you the code if you want.