Thread:Project:Support desk/mediawiki and phpBB3

I install MediaWiki 1.18.1 and phpBB 3.0.10

I know about Extension:PHPBB/Users_Integration and it does not suit me.

I need the following functionality:
 * 1) when user input login and password script first checks its presence in the database wiki
 * 2) if user not present in wiki userbase, script must access to phpBB3 user table (with ban-check), and if user present in phpBB3-usertable user login into wiki
 * 3) phpBB3-user must have full wiki-capabilities and script must map phpBB3 usergroups into the wiki-groups

I know about ExternalAuth, but I do not know what to do next

P.S. Sorry my bad english