[CentOS] login case sensitivity

[hw]

Kenneth Porter wrote:
> On 9/6/2017 3:45 AM, ken wrote:
>> I think it would also be a disservice to users, for case-insensitive userids is not what they'll find on web sites and web services throughout the rest of the world, even on their own phones.
>
> I agree with you on other points, but beware of this one. I've discovered that game logins, notably Blizzard, are case-insensitive. It's quite frustrating. (I also hate websites that reject spaces in passwords.) Then there's sites that reject plus signs in email and use your email as your account name, which frustrates anti-spam measures and attempts to make your account name harder to guess by adding a "disposable" address tag (eg. shiva+centoslistexample at sewingwitch.com).
>
> Let savvy users make their credentials harder to guess.

Plus signs in email addresses can have special meanings, depending on
the configuration of the MTA (or MTAs in the path), so it makes sense
to me to reject them.

(I don´t remember what they were used for or I would provide a suitable
link to the exim documentation ...)


Another thing is that the admin should be able to specify which characters
should be allowed/forbidden in file names.  I really don´t understand why
that isn´t possible; I consider it a requirement.