Re: About valid and invalid user names
On Sat, 05 Feb 2005, Bernd Eckenfels wrote:
> In article <[🔎] 20050205153241.GB26940@khazad-dum.debian.net> you wrote:
> > On Sat, 05 Feb 2005, Marc Haber wrote:
> >> adduser has two bug reports open where people are asking for user name
> >> rules to be relaxed. One report wants "." to be allowed in user names,
> >> another wants usernames to start with numbers.
> > Allowing the dot is ok. I do think that usernames starting with numbers is
> > asking for total breakage, though.
> Why not make it an configurable RE? You cant avoid ppl breaking their
Because people will use it to enable users with start with a digit, since
they certainly don't know better or they would never have asked for this.
If I name an user "0", what is the expected result of chown 0 somefile ?
root or the new user "0"? For all programs out there?
Please don't give people this much rope to hang themselves with *so easily*.
> systems, but you can help them to enforce their policy. For example : may be
> fine on non-passwd systems (however some tools will have trouble with that).
: is not fine because it is not POSIX. Other stuff might croak very hard on
> chown was recently fixed to allow . in usernames, no?
Because '.' is POSIX, thus valid. And not accepting the '.' is a damn
bug in any POSIX-compliant utility.
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