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Reply-To: Brian DOT Inglis AT SystematicSw DOT ab DOT ca
Subject: Re: Accessing SMB share as wrong user?
To: cygwin AT cygwin DOT com
References: <7f4eb950-de06-2981-c9b4-fd345c11ffb3 AT dd-b DOT net> <e0a75a70-9835-f12e-cba2-c91cfc656946 AT dd-b DOT net> <940871db-07d8-6528-bef3-f2630a89c505 AT SystematicSw DOT ab DOT ca> <704def19-dfa4-1ebc-512e-fae23199f7a6 AT dd-b DOT net>
From: Brian Inglis <Brian DOT Inglis AT SystematicSw DOT ab DOT ca>
Message-ID: <aba3800a-bf6d-6c3c-bc88-844819f3b366@SystematicSw.ab.ca>
Date: Mon, 29 May 2017 21:49:52 -0600
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On 2017-05-29 12:37, David Dyer-Bennet wrote:
> On 5/29/2017 12:45, Brian Inglis wrote:
>> On 2017-05-29 11:16, David Dyer-Bennet wrote:
>>> A simpler case demonstrating this; X0 is a new share (created just
>>> for testing this) with no prior history, nothing manually set.
>>> (Server is FreeNAS, current version).
>>> From the beginning, when it first sees it, it shows the file owners 
>>> and groups weirdly.
>>> And then it's able to create a file and write to it *once*, but
>>> can't then append to it???
>>> David Dyer-Bennet AT DDB4 //fsfs/x0
>>> $ id
>>> uid=197608(David Dyer-Bennet) gid=197121(None)
>>> groups=197121(None),197609(Ssh
>>> Users),545(Users),4(INTERACTIVE),66049(CONSOLE LOGON),11(Authenticated
>>> Users),15(This Organization),113(Local account),66048(LOCAL),262154(NTLM
>>> Authentication),401408(Medium Mandatory Level)
>>> David Dyer-Bennet AT DDB4 //fsfs/x0
>>> $ ls -ld .
>>> drwxrwxr-x+ 1 Unknown+User Unix_Group+1001 0 May 29 11:55 .
>>> David Dyer-Bennet AT DDB4 //fsfs/x0
>>> $ getfacl .
>>> # file: .
>>> # owner: Unknown+User
>>> # group: Unix_Group+1001
>>> user::rwx
>>> group::rwx
>>> other:r-x
>>> default:user::rwx
>>> default:group::rwx
>>> default:group:Unix_Group+1001:rwx
>>> default:mask:rwx
>>> default:other:r-x
>>> David Dyer-Bennet AT DDB4 //fsfs/x0
>>> David Dyer-Bennet AT DDB4 //fsfs/x0
>>> David Dyer-Bennet AT DDB4 //fsfs/x0
>>> $ echo something > foobar
>>> David Dyer-Bennet AT DDB4 //fsfs/x0
>>> $ ls -l foobar
>>> ----r--r-- 1 Unknown+User Unix_Group+1001 10 May 29 12:11 foobar
>>> David Dyer-Bennet AT DDB4 //fsfs/x0
>>> $ getfacl foobar
>>> # file: foobar
>>> # owner: Unknown+User
>>> # group: Unix_Group+1001
>>> user::---
>>> group::r--
>>> other:r--
>>> David Dyer-Bennet AT DDB4 //fsfs/x0
>>> $ echo more >> foobar
>>> -bash: foobar: Permission denied
>>
>> See Cygwin User's Guide section on Switching the user context:
>> $ cygstart
>> /usr/share/doc/cygwin-2.8.0/html/cygwin-ug-net/ntsec.html#ntsec-setuid-overview
>> OR
>> $ cygstart https://cygwin.com/cygwin-ug-net/ntsec.html#ntsec-setuid-overview
> 
> That appears to be instructions on how to temporarily, in code, act as
> another user.  My problem is that when I create a Bash shell, it
> accesses network drives as the wrong user.  It may be possible for me to
> write a version of Bash that switches to the right (default) user using
> that information, but why is it *necessary*?  Local drives are accessed
> fine.

That is the description of what Cygwin does to emulate a user context
for remote access to shares - you may want to set up and try methods 1,
2, and 3 to see what works with your network shares.

First step may be to change or remap your userid to one not containing
spaces using /etc/passwd; see
	https://cygwin.com/faq.html#faq.setup.name-with-space
then
	https://cygwin.com/cygwin-ug-net/ntsec.html#ntsec-mapping-samba

-- 
Take care. Thanks, Brian Inglis, Calgary, Alberta, Canada

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