define allowed format of usernames - login.defs does not wrk

Message

DawgG · Post by **DawgG** » Wed Apr 20, 2016 3:07 pm

on my systems i need usernames in the format
NN.NNN.NNN-N
(N=0-9)
useradd won't accept usernames in this format and /etc/login.defs has no setting for the allowed format/chars. Adding the entry CHARACTER_CLASS produces a configuration error (i tried shadow with and without USE="pam")
How to change the allowed format of the usernames?
Yes, i know it's not a good idea and non-standard and dangerous and trouble-prone - but i still need it.
(sorry for double-posting https://forums.gentoo.org/viewtopic-p-7909466.html but a quick solution would be much appreciated)
THX for your help!

Post by **Chiitoo** » Wed Apr 20, 2016 4:34 pm

Moved from Networking & Security to Duplicate Threads in the favour of [topic=1043292]define allowed format of usernames - login.defs does not wrk[/topic].

Also split two posts from here, merging them with aforementioned topic.

There can be only one. ^^