Incorrect names for file owners on mapped samba drives

[John Daintree]

Hello all,

I've got a number of drives mounted from  SAMBA machine (which is running
linux).  My local machine is running Cygwin 1.7 on Windows 7 x64.

Here's (some of) my mount output:

//devt/users/johnd on /j type smbfs (binary,notexec,user)
C:/cygwin/bin on /usr/bin type ntfs (binary,auto)
C:/cygwin/lib on /usr/lib type ntfs (binary,auto)
C:/cygwin on / type ntfs (binary,auto)
J: on /cygdrive/j type smbfs (binary,posix=0,user,noumount,auto)

"ls -l"  on /cygdrive/j and /j returns "????????" as the name of both the
owner and the group of all the files on those drives. Windows explorer
correctly identifies DEVT\johnd as the owner of the files.

johnd's line in  /etc/passwd is:

johnd:unused:1000:513:U-johnd-PC\johnd,S-1-5-21-2127453718-491543372-2845810
030-1000:/home/johnd:/bin/bash

and "id" returns:

uid=1000(johnd) gid=513(None)
groups=0(root),544(Administrators),545(Users),1006(Debugger Users),513(None)

on the SAMBA machine my UID is 208, so I figured I'd just need to change the
above to:

johnd:unused:208:513:U-johnd-PC\johnd,S-1-5-21-2127453718-491543372-28458100
30-208:/home/johnd:/bin/bash

But, having done that and re-logged in I get the message:

Your group is currently "mkpasswd".  This indicates that your gid is not in
/etc/group and your uid is not in /etc/passwd.

and the "id" command returns:

uid=400(johnd) gid=401(mkpasswd)
groups=0(root),544(Administrators),545(Users),1006(Debugger
Users),513(None),401(mkpasswd)

I've no idea where those 400s came from.

an "ls -n" on a single file returns:

rwxrw-r-- 1 4294967295 4294967295 1286 Mar 11  2009 zones.h

so maybe the UIDs aren't getting across at all from the SAMBA server.

What do I need to do to get the usernames "in sync" with the SAMBA box?

Thanks again everyone,

/john



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[Larry Hall (Cygwin)]

On 10/30/2009 11:46 AM, John Daintree wrote:
> on the SAMBA machine my UID is 208, so I figured I'd just need to change the
> above to:
>
> johnd:unused:208:513:U-johnd-PC\johnd,S-1-5-21-2127453718-491543372-28458100
> 30-208:/home/johnd:/bin/bash
      ^^^
Don't change your SID.  You can change your UID if you want, since this is a
Cygwin thing.  But if you change your SID, Cygwin can't map your UID back to
the Windows SID.  So then Windows won't know who you are, and Cygwin really
won't either (in Windows terms).  That's why you got the message you did.

Assuming SAMBA uses 208 as your user ID,you should get proper (user) ownerships
displaying.  The same is true for your GID, if you want that.

--
Larry Hall                              http://www.rfk.com
RFK Partners, Inc.                      [phone] - RFK Office
216 Dalton Rd.                          [phone] - FAX
Holliston, MA 01746

_____________________________________________________________________

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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[John Daintree]

> -----Original Message-----
> From: Larry Hall (Cygwin) [mailto:reply-to-list-only-lh@...]
> Sent: 30 October 2009 16:00
> To: cygwin@...
> Subject: Re: Incorrect names for file owners on mapped samba drives
>
> On 10/30/2009 11:46 AM, John Daintree wrote:
> > on the SAMBA machine my UID is 208, so I figured I'd just need to
> change the
> > above to:
> >
> > johnd:unused:208:513:U-johnd-PC\johnd,S-1-5-21-2127453718-491543372-
> 28458100
> > 30-208:/home/johnd:/bin/bash
>       ^^^
> Don't change your SID.  You can change your UID if you want, since this
> is a
> Cygwin thing.  But if you change your SID, Cygwin can't map your UID
> back to
> the Windows SID.  So then Windows won't know who you are, and Cygwin
> really
> won't either (in Windows terms).  That's why you got the message you
> did.
>
> Assuming SAMBA uses 208 as your user ID,you should get proper (user)
> ownerships
> displaying.  The same is true for your GID, if you want that.

Thanks Larry,  That seems to get be nearer where I want to be. I'm still getting some confusing (to me at least!) results.

Given that mount includes:

U: on /cygdrive/u type smbfs (binary,posix=0,user,noumount,auto)

i.e. u: and /cygdrive/u are the same location

why is it that "ls -n u:/tmp/jd.tmp" gives:

-rw-r--r-- 1 208 200 0 Oct 30 16:45 u:/tmp/jd.tmp

but "ls -n /cygdrive/u/tmp/jd.tmp" gives:

-rw-r--r-- 1 4294967295 4294967295 0 Oct 30 16:45 /cygdrive/u/tmp/jd.tmp

In addition "ls -n u:/tmp/*" returns the same UID (MY uid) for every file in the directory even though they are owned by different users. I created a new user on my windows machine and when I log in on that account all the files in u:/tmp are reported as owned by that user. Again windows explorer lists the correct owner for each file (as DEVT\username).

Thanks again,
john.

> --
> Larry Hall                              http://www.rfk.com
> RFK Partners, Inc.                      [phone] - RFK Office
> 216 Dalton Rd.                          [phone] - FAX
> Holliston, MA 01746
>
> _____________________________________________________________________
>
> 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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[John Daintree]

> <http://cygwin.com/acronyms/#PCYMTNQREAIYR>.  

Hi Larry,

Thanks for the heads up about PCYMTNQREAIYR, I'll configure my Mailer/Client as soon as I can get the IT guys to do it, or figure out how to change my Outlook 2007 preferences.

I've established that the differences in the output of -ls -l on the different drives is down to differences in acl/noacl.
 
$ mount
//devt/devt on /u type smbfs (binary,notexec,noacl,posix=0,user)
U: on /cygdrive/u type smbfs (binary,posix=0,user,noumount,auto)

ls -l on u:/tmp returns "johnd" as owner of files
ls -l on /u/tmp returns "johnd" as owner
ls -l on /cygdrive/u returns "????????" as owner

I suspect that the difference is that /cygdrive/u does not have "noacl".

I also tried mounting with posix 0 and 1, but that seemed to make no difference.

As I said before ls -l  returns "johnd" as the owner on all files (not just mine) which is odd, but less important to me right now. Interestingly the mks "ls" returns different SIDs for different files, but not the windows SIDs. I guess it returns the SAMBA SIDs, and I'm missing a mapping layer somewhere. If you have insight on that I love to hear it.

Thanks for the help,
john.


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[Corinna Vinschen-2]

On Nov  2 09:21, John Daintree wrote:

> I've established that the differences in the output of -ls -l on the different drives is down to differences in acl/noacl.
>  
> $ mount
> //devt/devt on /u type smbfs (binary,notexec,noacl,posix=0,user)
> U: on /cygdrive/u type smbfs (binary,posix=0,user,noumount,auto)
>
> ls -l on u:/tmp returns "johnd" as owner of files
> ls -l on /u/tmp returns "johnd" as owner
> ls -l on /cygdrive/u returns "????????" as owner
>
> I suspect that the difference is that /cygdrive/u does not have "noacl".

That's what acl/noacl is for.  See the user's guide:
http://cygwin.com/1.7/cygwin-ug-net/using.html#mount-table

With "acl" switched on, Cygwin uses what's returned by the file system
and in case of a Samba share the user and group are special SIDs
constructed from the OSes uid/gid values.

If you want nice entries in ls -l output, add the users and groups to
your local /etc/passwd and /etc/group files using mkpasswd and mkgroup
with the new -U options:

http://cygwin.com/1.7/cygwin-ug-net/using-utils.html#mkpasswd
http://cygwin.com/1.7/cygwin-ug-net/using-utils.html#mkgroup

For instance:

  $ mkpasswd -U root,corinna -S_ -L my_samba_box
  Unix User_root:unused:10000:99999:,S-1-22-1-0::
  Unix User_corinna:unused:10500:99999:,S-1-22-1-500::
  $ mkpasswd -U root,corinna -S_ -L my_samba_box >> /etc/passwd
  $ mkgroup -U root,corinna -S_ -L my_samba_box
  Unix Group_root:S-1-22-2-0:10000:
  Unix Group_vinschen:S-1-22-2-11125:21125:
  $ mkgroup -U root,corinna -S_ -L my_samba_box >> /etc/group
  $ cd //my_samba_box/my_share
  $ ls -l some_file
  -rw------- 1 UnixUser_corinna UnixGroup_vinschen 172 2009-09-22 16:27 some_file


Corinna

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Red Hat

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[John Daintree]

> -----Original Message-----
> From: Corinna Vinschen
> Sent: 02 November 2009 12:31
> To: cygwin@...
> Subject: Re: Incorrect names for file owners on mapped samba drives
>
> If you want nice entries in ls -l output, add the users and groups to
> your local /etc/passwd and /etc/group files using mkpasswd and mkgroup
> with the new -U options:
>
> http://cygwin.com/1.7/cygwin-ug-net/using-utils.html#mkpasswd
> http://cygwin.com/1.7/cygwin-ug-net/using-utils.html#mkgroup
>
> For instance:
>
>   $ mkpasswd -U root,corinna -S_ -L my_samba_box
>   Unix User_root:unused:10000:99999:,S-1-22-1-0::
>   Unix User_corinna:unused:10500:99999:,S-1-22-1-500::
>   $ mkpasswd -U root,corinna -S_ -L my_samba_box >> /etc/passwd
>   $ mkgroup -U root,corinna -S_ -L my_samba_box
>   Unix Group_root:S-1-22-2-0:10000:
>   Unix Group_vinschen:S-1-22-2-11125:21125:
>   $ mkgroup -U root,corinna -S_ -L my_samba_box >> /etc/group
>   $ cd //my_samba_box/my_share
>   $ ls -l some_file
>   -rw------- 1 UnixUser_corinna UnixGroup_vinschen 172 2009-09-22 16:27
> some_file
>

Hi Corinna,

Thanks for the examples. I had read the man pages for mkpasswd and mkgroup
(honest!), but I must have had my incantations a little wrong.

I have most of the users and groups over now. Interestingly the "root" group
still displays as "????????" in the ls output, but such files are rare and I
can live with that for now.

Thanks again.
/john








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[Larry Hall (Cygwin)]

On 11/02/2009 08:58 AM, John Daintree wrote:
> Thanks for the examples. I had read the man pages for mkpasswd and mkgroup
> (honest!), but I must have had my incantations a little wrong.
>
> I have most of the users and groups over now. Interestingly the "root" group
> still displays as "????????" in the ls output, but such files are rare and I
> can live with that for now.

See <http://cygwin.com/1.7/cygwin-ug-net/using-filemodes.html> if you're
interested
in the details here.

Sorry about the posix/acl mix-up.  I'm still getting used to the new flags
in 1.7 and
haven't committed everything to memory yet, as you can see. ;-)

--
Larry Hall                              http://www.rfk.com
RFK Partners, Inc.                      [phone] - RFK Office
216 Dalton Rd.                          [phone] - FAX
Holliston, MA 01746

_____________________________________________________________________

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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