revise restricted system usernames

[phillxnet]

Within our user management we have a hard-wired username list. This is in need of revision.
See:

rockstor-core/src/rockstor/storageadmin/views/user.py

Lines 39 to 41 in 5252197

	class UserMixin(object):
	serializer_class = SUserSerializer
	exclude_list = (

Used primarily for validating user input re users.

[Hooverdan96]

I attempted to do a comparison between two current OpenSUSE flavors we have and whether they are in the currently maintained list. After a fairly fresh install, these were the users I've identified (I think I excluded all the users, I didn't create manually). I don't have a 15.5 install, but I assume it will either be the same as 15.4 or fairly close.

User	Description	Current Hard-code	LEAP 15.4	TW
at	Batch jobs daemon	No	X	X
avahi	User for Avahi	X	X	X
bin	bin	X	No	X
chrony	Chrony Daemon	No	X	X
daemon	Daemon	X	X	X
dnsmasq	dnsmasq	No	No	X
dockremap	docker --userns-remap=default	No	X	X
lp	Printing daemon	No	X	X
mail	Mailer daemon	X	X	X
messagebus	User for D-Bus	No	X	X
nginx	User for nginx	X	X	X
nobody	nobody	X	X	X
nscd	User for nscd	No	No	X
ntp	NTP account	X	X	X
pesign	PE-COFF signing daemon	No	X	X
polkitd	User for polkitd	No	X	X
postfix	Postfix Daemon	X	X	X
postgres	PostgreSQL Server	X	X	X
root	root	X	X	X
rpc	User for rpcbind	X	X	X
shellinabox	user for shellinabox	No	X	X
sshd	SSH daemon	X	X	X
statd	NFS statd daemon	No	X	X
systemd-network	systemd Network Management	No	X	No
systemd-timesync	systemd Time Synchronization	No	X	X
tftp	TFTP Account	No	No	X
unbound	unbound caching DNS server	No	No	X
upsd	UPS daemon	No	X	X

Or, mix it with the list here, which is more comprehensive, just to be safe: https://doc.opensuse.org/documentation/leap/startup/html/book-startup/cha-yast-userman.html#sec-yast-userman-defaults

[phillxnet]

@Hooverdan96 Thanks for following-up on this one. I think all we need now is to establish what the system users are on each of our OS bases - likely prioritising TW. And ensure we cover them in our system users list. Pretty sure this is just a mask to identify all users we know are system users and flag them as such. Bit tricky but doable. The current list is just left over from our CentOS days is my assumption.

[phillxnet]

Closing as:
Fixed by #2866