mediawiki and phpBB3

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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:

when user input login and password script first checks its presence in the database wiki
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
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