[LightDM] Restrict login name

[Adam Barnett]

Hi All,

We are using Centos 7.4, sssd for auth ( linked to AD)
We are finding that people are logging in user the ( for want of a better
word ) email address ( username at domain)  instead of just their username.
This is causing some issues with some of our tools that  now gets the wrong
$USER variable. Is there a way to stop people entering the special
character i.e @ which would then stop people using their email address

Thanks
Adam

-- 
Adam Barnett
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