make user su - user1 after login, but not log in as user1

[Ratzie]

We are trying to incorporate some security features on our server. Unfortunately we have to have telnet turned on.

One application runs under a certain user, I have created everyone there own userid's and want them to log in with there id's and then su - to that specific user. This way I know who is actually logged in.

I know this can be done with ssh, but how would you do it with telnet.
I would like to give back a banner as well that they can not log in with this id, please log in with your own user id and su - to the user id.

[Jim Butler]

You can modify the global startup scripts
(/etc/csh.login) for example
to look at uid and break out, exit, echo a message, whatever -

Let me know if you need sample code.

[Ratzie]

Yes, I would really appreciate any script.

So it is not as easy as ssh...