Seamless Authentication?

How to authenticate user on diff remote servers without need for pass input

[NooK]

I am currently designing a webpage where the user logs into his computer on the intranet (Which is then authenticated in a remote Active Directory server) and from there he can access different part of the system such as his emails (Exchange server) and so on without the further need for a login/password input.

I am designing the page in PHP and the webserver is running windows with iis 6.0

My problem is that I would like to authenticate the user to those different servers (Such as the Active Directory for information search and the Exchange Server to allow php to send emails) but I have not been able to do so.

I can get the user login name with $_SERVER['REMOTE_USER'] but I have no idea how to continue for the password as I dont think I am able to retrieve the users password (Doesn't sound reasonable that it would be possible to do this) so I have no idea to proceed to be able to authenticate the user to those services so that he can access his functions from our web applikation.

Can anybody give me some tips as to how to continue?

Best Regards

NooK

[henry0]

Using session across multiple DN could be your answer

Read previous thread [webmasterworld.com]

<edit>
Do a search here I remember having seen a few of those previously
</edit>

[NooK]

Thank you but the user logs in the system (Windows network) and not the webpage and my problem is if there is any way to authenticate the user to such systems as email server, Active Directory and so on?

Best Regards

NooK