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Date: Thu, 14 Feb 2019 01:09:47 +0300
From: Andrey Repin <anrdaemon AT yandex DOT ru>
Reply-To: cygwin AT cygwin DOT com
Message-ID: <968457789.20190214010947@yandex.ru>
To: Bill Stewart <bstewart AT iname DOT com>, cygwin AT cygwin DOT com
Subject: Re: sshd: computer name's case must match?
In-Reply-To: <CANV9t=Q49YOZ26AEKu0nx4UW2hGvaXt+0wf3nKtRq3_AguYz6A@mail.gmail.com>
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Greetings, Bill Stewart!

Preface: Please teach your mail agent to not quote raw email addresses.

>> > (a) Domain or computer name portion to the left of the "+" must always
>> > be uppercase
>>
>> No, the case must match the case of the domain or computername.
>>
>> > (b) Username after "+" sign (or username alone, without "+" sign) must
>> > match case exactly
>> >
>> > Questions:
>> >
>> > 1. Are the above two statements (a) and (b) complete/correct?
>> >
>> > 2. With regards to (a), are there any cases where the domain or
>> > computer name is not uppercase?
>>
>> Yes.  In my domain I have four machines using all-lowercase machine
>> name for no apparent reason.  One is a Linux machine, one is a
>> Windows 7 64 bit, the other two are Windows 8.1 32 and 64 bit machines.
>> All others, including the Windows 8 machines, are all uppercase.

> The computer or domain name case inconsistency would seem to be a
> source of confusion, mainly because on the Windows side we are
> case-retentive but not case-sensitive, and it is not immediately
> obvious which case will apply in the case of a computer or domain
> name.

I can only add to what Corinna said previously: computer names may turn up
having any letter casing, although I mostly observed Windows systems having
all-uppercase names, if first letter was uppercase ("Station14" ->
"STATION14"), where Linux systems would be case-exact.

> According to: http://pubs.opengroup.org/onlinepubs/9699919799/ -

>> 3.437 User Name - A string that is used to identify a user;
>> see also User Database. To be portable across systems
>> conforming to POSIX.1-2017, the value is composed of
>> characters from the portable filename character set. The
>> <hyphen-minus> character should not be used as the first
>> character of a portable user name.
>>
>> 3.282 Portable Filename Character Set
>>
>> The set of characters from which portable filenames are
>> constructed.
>>
>> 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 . _ -
>>
>> The last three characters are the <period>, <underscore>,
>> and <hyphen-minus> characters, respectively.

> From this reference, it seems that a POSIX-compliant username cannot
> contain the + character?

> So my suggestion is for Cygwin to convert the name part before the +
> automatically to upper (or lower) case.

> Thoughts?


-- 
With best regards,
Andrey Repin
Thursday, February 14, 2019 1:03:58

Sorry for my terrible english...


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