On Thursday 18 August 2011 09:42:52 Joakim Tjernlund wrote:
>
> Noticed that busybox(v1.14.2 so its old) doesn't allow capital letters in
> user names.
> Read on the net that some services (like sendmail) might lower cases all
> names before
> looking them up. The info I found was rather old though.
>
> What is the deal with capital letters in user names these days?
>
> Jocke
>
Hi,
if you enable the relevant config option CONFIG_FEATURE_CHECK_NAMES
the set of allowed characters is (Portable Filename Character Set):
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
a b c d e f g h i j k l m n o p q r s t u v w x y z
0 1 2 3 4 5 6 7 8 9 . _ -
plus '$' (only at the end of the username).
We also disallow '-' and '.' as first characters.
Ciao,
Tito
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