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From:	"Christoph H. Hochstaetter" <christoph AT hochstaetter DOT de>
References:	<20140730134716 DOT GM25860 AT calimero DOT vinschen DOT de>
In-Reply-To:	<20140730134716.GM25860@calimero.vinschen.de>
MIME-Version:	1.0
Date:	Thu, 31 Jul 2014 23:06:00 +0200
Message-ID:	<259120036f9fe92106ee2f4344c83734@mail.gmail.com>
Subject:	AW: Simplify AD integration?
To:	cygwin AT cygwin DOT com
X-IsSubscribed:	yes

Corinna Vinschen wrote:
>Default is 'auto':
>
>    builtin accounts;   "+SYSTEM", "+LOCAL", etc.
>    primary domain      "corinna", "cgf", ...
>    other domain:       "DOMAIN1+walter", "DOMAIN2+mathilda"
>
>  If set to 'primary':
>
>    builtin accounts;   "+SYSTEM", "+LOCAL", etc.
>    primary domain      "MYDOMAIN+corinna", "MYDOMAIN+cgf", ...
>    other domain:       "DOMAIN1+walter", "DOMAIN2+mathilda"
>
>  If set to 'always':
>
>    builtin accounts;   "NT AUTHORITY+SYSTEM", "BULTIN+LOCAL", etc.
>    primary domain      "MYDOMAIN+corinna", "MYDOMAIN+cgf", ...
>    other domain:       "DOMAIN1+walter", "DOMAIN2+mathilda"

>1. Shall we remove the leading '+' from the builtin account names
>   or shall we keep it?

None of these three seem correct to me. It should be:

builtin accounts;   "NT AUTHORITY+SYSTEM", "BULTIN+LOCAL", etc.
primary domain      "corinna", "cgf", ...
other domain:       "DOMAIN1+walter", "DOMAIN2+mathilda"

Windows treats "NT AUTHORITY" and "BUILTIN" as foreign domains like DOMAIN1
and DOMAIN2 in Win32 APIs that use a single string for domain and username,
e.g. lpServiceStartName in CreateService. Examples:

".\user1" - can be uses as a shortcut for "MYDOMAIN\user1"
".\NetworkService" - cannot be used as a shortcut for "NT
AUTHORITY\NetworkService"
".\WdiServiceHost" - cannot be used as a shortcut for "NT
SERVICE\WdiServiceHost"

Whenever ".\some name" cannot be used as shortcut for "some default\some
name" in Win32, it should not be converted to "+some name" but to
"DOMAIN+some name" in Cygwin. This should be at least configurable thru
db_prefix even though most users might not want to see names like " NT
AUTHORITY+SYSTEM " in ls -l.

>2. Shall we stick to '+' as the separator char or choose another one?
>   If so, which one?

Yes "+" is well known for that purpose in Linux and other Unixes. Keep
db_separator in /etc/nsswitch.conf if possible

>3. Shall we keep the `db_prefix' variability or choose one of
>   the prefixing methods and stick to it?  If so, which one, auto,
>   primary, or always?
See above

>Bonus question:
>
>4. Should Cygwin downcase all usernames when generating the Cygwin
>   username
I prefer downcase. Other users probably will not. So db_username_downcase =
true/false would be great.

-Christoph

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