Hook/Module AS player is joining?

[Saint Devil]

Is there any hook/module that can be called when a player is joining? For example, stop them before they actually get into the server? Like bans do, they kick you before you get in.

[DarkSpider]

GM.PlayerConnect
GM.PlayerAuthed

[Saint Devil]

Thanks! So for example to stop all joining I do:

[lua]function GM:PlayerAuthed(ply, sid, uid)
return false
end[/lua]