Problem with "None" Group on Non-Domain Members

[Larry Hall (Cygwin)]

On 05/05/2014 06:07 PM, Chris J. Breisch wrote:
> Chris J. Breisch wrote:
>> Larry Hall (Cygwin) wrote:
>>> On 05/05/2014 02:56 PM, Chris J. Breisch wrote:
>>>> Corinna Vinschen wrote:
>>>>> On May 5 12:17, Chris J. Breisch wrote:
>>>>>> Corinna Vinschen wrote:
>>>>>>> An strace of `chmod 400 bar' might sched some light on this issue,
>>>>>>> but I
>>>>>>> have a gut feeling the underlying WIndows call will not even
>>>>>>> return an
>>>>>>> error code...
>>>>>> Attached. Your gut seems to be working today...
>>>>>
>>>>> There *is* something weird here. Look at this:
>>>>>
>>>>>> 151 36702 [main] chmod 5536 alloc_sd: uid 1001, gid 513, attribute
>>>>>> 0x2190
>>>>>> 65 36767 [main] chmod 5536 cygsid::debug_print: alloc_sd: owner SID
>>>>>> = S-1-5-21-3514886939-1786686319-3519756147-1001 (+)
>>>>>> 70 36837 [main] chmod 5536 cygsid::debug_print: alloc_sd: group SID
>>>>>> = S-1-5-21-3514886939-1786686319-3519756147-1001 (+)
>>>>>
>>>>> alloc_sd (the underlying function creating a security descriptor) gets
>>>>> a uid 1001 and gid 513 as input, as usual. But the owner *and* group
>>>>> SIDs of the file's existing security descriptor is
>>>>> S-1-5-21-3514886939-1786686319-3519756147-1001, the SID of your user
>>>>> account.
>>>>>
>>>>> Why is your user account the primary group of the file, even though
>>>>> your user token definitely has "None" (513) as its primary group?
>>>>> How did it get there?
>>>>>
>>>> I don't have a clue. You're the expert. :)
>>>>
>>>
>>> I'm wondering if we're getting the user id as the group for the MS
>>> Account because there is no group id. Chris, what does 'id' for
>>> each of these accounts look like and is the group id (assuming they
>>> are different that the user id) in there?
>>>
>>>
>>
>> Well, I hope I'm not comparing apples and oranges, because now I'm at
>> home. However, I have duplicated the scenario and results on this
>> machine. It was actually where I noticed it first.
>>
>> id produces expected results:
>>
>> MS account:
>> $ id
>> uid=1001(Chris) gid=513(None) groups=513(None),545(Users),1003(HomeUsers)
>>
>> Local account:
>> $ id
>> uid=1007(cjb) gid=513(None) groups=513(None),545(Users),1003(HomeUsers)
>>
>> Actually, it's not quite what I expected. Chris is in the Administrators
>> group, and that's not shown.
>>
>> $ net user Chris
>> User name Chris
>> Full Name Chris Breisch
>> Comment
>> User's comment
>> Country/region code 001 (United States)
>> Account active Yes
>> Account expires Never
>>
>> [snip PW stuff for Cygwin filter]
>>
>> Workstations allowed All
>> Logon script
>> User profile
>> Home directory
>> Last logon 5/1/2014 8:39:44 PM
>>
>> Logon hours allowed All
>>
>> Local Group Memberships *Administrators *HomeUsers
>> *Users
>> Global Group memberships *None
>> The command completed successfully.
>>
>> $ net user cjb
>> User name cjb
>> Full Name cjb
>> Comment
>> User's comment
>> Country/region code 000 (System Default)
>> Account active Yes
>> Account expires Never
>>
>> [snip]
>>
>> Workstations allowed All
>> Logon script
>> User profile
>> Home directory
>> Last logon 5/5/2014 5:40:39 PM
>>
>> Logon hours allowed All
>>
>> Local Group Memberships *HomeUsers *Users
>> Global Group memberships *None
>> The command completed successfully.
>>
>>
> Hmmm, just noticed something in /etc/group:
>
> Chris J. Breisch:S-1-5-21-3514886939-1786686319-3519756147-1001:11001:
>
> and on another machine where I can reproduce this:
> Chris:S-1-5-21-1055441198-2882714470-4103286779-1001:11001:
>
> Oddly, mkgroup -l does not produce this line on either machine, so I'm not
> sure where it came from. In both cases, the SID for the group is the same as
> the my user's SID.

Is 513/None in the /etc/group file too or is it missing?


-- 
Larry

_____________________________________________________________________

A: Yes.
 > Q: Are you sure?
 >> A: Because it reverses the logical flow of conversation.
 >>> Q: Why is top posting annoying in email?

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