[Typo3] FeUser authentification

[Pierre Rouwens]

Hi listers,

I'm trying to create an extension to authenticate FeUsers, i'm using
typo3 3.8 and i saw in the source code that i have to use 'auth' service
to do it cleanly... but i can't find more explanation about it... i've
looked into others extensions like ldap_auth... it seems i have to
extend tx_sv_authbase ... and if i return >=200 the authentification is
ok...
is this right ?
Cause i've tried only to test to create a class extending tx_sv_authbase
and directly return 200 ... and i can't login
Where did i fail please ?

Thanks for any clues, hints or anything else :)

Pierre