I’ve created a beta Joomla1.5 Plugin, that allows Openfire to authenticate against the Joomla1.5 users database.
The plugin is for Joomla1.5, not Openfire. But it allows your OpenFire sever to use the user accounts in Joomla. This isn’t possible without the plugin since Joomla user passwords are seeded before MD5 hashed which makes the OpenFire SQL queries incompatible.
Documentation is on the page: