[imp] Authentication directly via link

[Jan Tammen]

Bonjour.

I'm trying to login directly to the IMP-application via a link like this:

http://MYSERVER/horde2/imp/redirect.php?actionID=105&imapuser=MYUSER&pass=CLEAR_PWD&server=MAILSERVER

Everything works fine when I'm providing the cleartext-password. Yes, I _do_ understand why this is so ;-) The problem here is, that I'm using the IMAP-Auth driver to authenticate the mail-users against a database-table (using pam-mysql) and I do _not_ store the passwords in cleartext.

So I cannot grab the password from the database and automatically create that login-link for the user. On the other hand, I also want manual logins to be possible and so I cannot just change the pam-config to use encrypted passwords.

How could I make that distinction between 
a) credentials come via GET -> do compare the password directly as it is already encrypted/hashed.

b) credentials come via POST -> do the "normal" password-check.

Could I use two different pam-configurations, one which uses encrypted passwords, one which uses cleartext passwords? Or would I have to switch to the SQL-Auth driver? But could I then use my already-existing user-database for authentication?

Anyone did this before?
So many questions ... merci, Jan ;-)