я думаю, при помощи
Multisites Site Manager Pro - no problem делается авторизация на другом сайте по ссылке после авторизации на первом:
Features comprise Multisites Site Manager's features complemented with the following:
- choose files and database tables to copy
- display a list of associated sites on the main site
- shows the progress of copying
- NOW has the automated users synchronization function (from main site to subsites only)
- NOW if user is associated with one site he will be redirected there automatically after logging in(optional)
- will synchronize files in a more intelligent way (unchanged files will not be copied)
- Pro component is not copied to the subsites
- copy speed enhancement
Note: if copies not are made on subdomains but on other domains you should use ProFTP version!
Single Sign-On is included in this package!
Synchronization & SingleSignOn is possible only for J! sites of same version line: Joomla up until 1.0.12; Joomla 1.0.13 and above; Joomla 1.5.x. Two sites based on Joomla 1.5.x and 1.0.x won't be synchronized! Feel free to browse the support forum.
ну и еще
MySQL Auth Plugin for Joomla 1.5:
This plugin for Joomla 1.5 let authenticate users against an external MySQL database. The plugin is fully configurable by Admin area where the host, port, database, table, username column, password column, first name column, last name column and email column can be configured. If the password at remote site changed, then you will be able to login by using that new password.
