[Samba] Clients can't write to group-writable files

[Josh Malone]

Hello,

Really stumped on this issue. I have samba 4.4.7 running on a new 
server. Users cannot write to files to which they have write permissions 
via group.

Example:

Here's the local filesystem on the samba server. I'm logged in as jmalone


: jmalone at canis; cd /home/www.nrao.edu/content/logs/
: jmalone at canis; ls -l
total 4
-rw-rw-r-- 1 jmalone         nraoweb  0 Nov 10 10:02 baz
-rw-rw-r-- 1 pmurphy         cvweb    0 Nov 10 11:09 foobar
: jmalone at canis; touch foobar


No problems. Now, let me mount that on my Mac:


: jmalone at agrajag; cd /Volumes/www.nrao.edu/content/logs
: jmalone at agrajag; ls -l
total 2
-rwx------  1 jmalone  nraocv   0 Nov 10 10:02 baz
-rwx------  1 jmalone  nraocv   0 Nov 10 11:09 foobar
-rwx------  1 jmalone  nraocv  44 Nov 13  2006 index.html
: jmalone at agrajag.cv; touch foobar
touch: foobar: Permission denied

I can write to 'baz' though.

Here's the log entries from the failed write attempt:

[2016/11/10 10:01:58.250031,  2] ../source3/smbd/open.c:1025(open_file)
   jmalone opened file content/logs/foobar read=No write=No (numopen=4)
[2016/11/10 10:01:58.251220,  2] 
../source3/smbd/close.c:793(close_normal_file)
   jmalone closed file content/logs/foobar (numopen=3) NT_STATUS_NOT_FOUND
[2016/11/10 10:01:58.252517,  2] ../source3/smbd/open.c:1025(open_file)
   jmalone opened file content/logs/foobar read=No write=No (numopen=4)
[2016/11/10 10:01:58.253723,  2] 
../source3/smbd/close.c:793(close_normal_file)
   jmalone closed file content/logs/foobar (numopen=3) NT_STATUS_NOT_FOUND


The listing is weird over cifs too - not sure if that's the source of 
problems or a symptom, or a red herring. I also get the same error on a 
Windows smb client. I've tried 4.5.1, 4.4.5, and now 4.3.12 and they all 
do the same thing. My old server running 4.0 didn't have this issue.

In case it matters, the filesystem being shared via samba is NFS mounted 
to the samba server.

Thanks so much,

-Josh

-- 
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        Joshua Malone       Systems Administrator
      (jmalone at nrao.edu)    NRAO Charlottesville
         434-296-0263           www.nrao.edu
	434-249-5699 (mobile)
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