Auto-login users who have already authenticated to external intranet site?

[concept]

Hello,

We have an intranet site that our users login to with basic authentication using their ldap user creds via mod_auth_ldap. The intranet site is running on a different machine that is running Apache. Zimbra is using external ldap auth using the same creds as the intranet uses.

I want them to be able to click a link from the intranet site to login to Zimbra from the intranet site and have Zimbra auto-login the user. I can have the link that they click magically include their username but I don't know how to do anything else. Anybody have ideas?

[schemers]

take a look at this:

Extending authentication

[concept]

On first reading of that post that you pointed me to, I'm a little confused, but I'll try and make sense of it and put it to use. Thank you.