thr3ads.net - samba - [Samba] Clients can't write to group-writable files [Nov 2016]

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Josh Malone

2016-Nov-10 18:13 UTC

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

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

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

Josh Malone

2016-Nov-14 16:38 UTC

head link

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

All,

Apologies for basically bumping my own thread, but I'm absolutely at my 
wits' end trying to figure out this access problem. I've replicated the 
issue with and without NFS being involved. On our old 4.0.25 server, 
users can write to files that they have group-based write permissions. 
On 4.5.x, 4.4.x, and 4.3.x that permission is not being honored.

I would be incredibly grateful for help debugging this issue. I've gone 
over level 10 logs and nothing is looking like a smoking gun. Lots of 
stuff like:

   open_file_ntcreate: fname=logs/foobar, after mapping access_mask=0x20087
[2016/11/14 11:32:30.009669,  4, pid=9336, effective(2310, 2049), 
real(2310, 0)] ../source3/smbd/open.c:2758(open_fi
le_ntcreate)
   calling open_file with flags=0x2 flags2=0x0 mode=0744, access_mask = 
0x20087, open_access_mask = 0x20087
[2016/11/14 11:32:30.009702, 10, pid=9336, effective(2310, 2049), 
real(2310, 0), class=acls] ../source3/smbd/posix_a
cls.c:3558(posix_get_nt_acl)
   posix_get_nt_acl: called for file logs/foobar
[2016/11/14 11:32:30.009753, 10, pid=9336, effective(2310, 2049), 
real(2310, 0)] ../source3/passdb/lookup_sid.c:1251
(uid_to_sid)
   uid 12477 -> sid S-1-22-1-12477
[2016/11/14 11:32:30.009784, 10, pid=9336, effective(2310, 2049), 
real(2310, 0)] ../source3/passdb/lookup_sid.c:1300
(gid_to_sid)
   gid 9006 -> sid S-1-22-2-9006
[2016/11/14 11:32:30.009811, 10, pid=9336, effective(2310, 2049), 
real(2310, 0), class=acls] ../source3/smbd/posix_a
cls.c:2724(canonicalise_acl)
   canonicalise_acl: Access ace entries before arrange :
[2016/11/14 11:32:30.009831, 10, pid=9336, effective(2310, 2049), 
real(2310, 0), class=acls] ../source3/smbd/posix_a
cls.c:2737(canonicalise_acl)
   canon_ace index 0. Type = allow SID = S-1-1-0 other SMB_ACL_OTHER 
ace_flags = 0x0 perms r--
[2016/11/14 11:32:30.009858, 10, pid=9336, effective(2310, 2049), 
real(2310, 0), class=acls] ../source3/smbd/posix_a
cls.c:2737(canonicalise_acl)
   canon_ace index 1. Type = allow SID = S-1-22-2-9006 gid 9006 (cvweb) 
SMB_ACL_GROUP_OBJ ace_flags = 0x0 perms rw-
[2016/11/14 11:32:30.009981, 10, pid=9336, effective(2310, 2049), 
real(2310, 0), class=acls] ../source3/smbd/posix_a
cls.c:2737(canonicalise_acl)
   canon_ace index 2. Type = allow SID = S-1-22-1-12477 uid 12477 
(pmurphy) SMB_ACL_USER_OBJ ace_flags = 0x0 perms rw
-
[2016/11/14 11:32:30.010484, 10, pid=9336, effective(2310, 2049), 
real(2310, 0), class=acls] ../source3/smbd/posix_a
cls.c:848(print_canon_ace_list)
   print_canon_ace_list: canonicalise_acl: ace entries after arrange
   canon_ace index 0. Type = allow SID = S-1-22-1-12477 uid 12477 
(pmurphy) SMB_ACL_USER_OBJ ace_flags = 0x0 perms rw
-
   canon_ace index 1. Type = allow SID = S-1-22-2-9006 gid 9006 (cvweb) 
SMB_ACL_GROUP_OBJ ace_flags = 0x0 perms rw-
   canon_ace index 2. Type = allow SID = S-1-1-0 other SMB_ACL_OTHER 
ace_flags = 0x0 perms r--


but I'll admit I'm not sure what I'm looking for.

On 11/10/16 1:13 PM, Josh Malone via samba wrote:> 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.
>

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

Jeremy Allison

2016-Nov-14 23:32 UTC

head link

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

On Mon, Nov 14, 2016 at 11:38:52AM -0500, Josh Malone via samba
wrote:> All,
> 
> Apologies for basically bumping my own thread, but I'm absolutely at
> my wits' end trying to figure out this access problem. I've
> replicated the issue with and without NFS being involved. On our old
> 4.0.25 server, users can write to files that they have group-based
> write permissions. On 4.5.x, 4.4.x, and 4.3.x that permission is not
> being honored.

Look for an ACCESS_DENIED. Check the token of the smbd
issuing that error. We check the Windows ACL against
the token before allowing the write.

>   open_file_ntcreate: fname=logs/foobar, after mapping access_mask=0x20087
> [2016/11/14 11:32:30.009669,  4, pid=9336, effective(2310, 2049),
> real(2310, 0)] ../source3/smbd/open.c:2758(open_fi
> le_ntcreate)
>   calling open_file with flags=0x2 flags2=0x0 mode=0744, access_mask
> = 0x20087, open_access_mask = 0x20087
> [2016/11/14 11:32:30.009702, 10, pid=9336, effective(2310, 2049),
> real(2310, 0), class=acls] ../source3/smbd/posix_a
> cls.c:3558(posix_get_nt_acl)
>   posix_get_nt_acl: called for file logs/foobar
> [2016/11/14 11:32:30.009753, 10, pid=9336, effective(2310, 2049),
> real(2310, 0)] ../source3/passdb/lookup_sid.c:1251
> (uid_to_sid)
>   uid 12477 -> sid S-1-22-1-12477
> [2016/11/14 11:32:30.009784, 10, pid=9336, effective(2310, 2049),
> real(2310, 0)] ../source3/passdb/lookup_sid.c:1300
> (gid_to_sid)
>   gid 9006 -> sid S-1-22-2-9006
> [2016/11/14 11:32:30.009811, 10, pid=9336, effective(2310, 2049),
> real(2310, 0), class=acls] ../source3/smbd/posix_a
> cls.c:2724(canonicalise_acl)
>   canonicalise_acl: Access ace entries before arrange :
> [2016/11/14 11:32:30.009831, 10, pid=9336, effective(2310, 2049),
> real(2310, 0), class=acls] ../source3/smbd/posix_a
> cls.c:2737(canonicalise_acl)
>   canon_ace index 0. Type = allow SID = S-1-1-0 other SMB_ACL_OTHER
> ace_flags = 0x0 perms r--
> [2016/11/14 11:32:30.009858, 10, pid=9336, effective(2310, 2049),
> real(2310, 0), class=acls] ../source3/smbd/posix_a
> cls.c:2737(canonicalise_acl)
>   canon_ace index 1. Type = allow SID = S-1-22-2-9006 gid 9006
> (cvweb) SMB_ACL_GROUP_OBJ ace_flags = 0x0 perms rw-
> [2016/11/14 11:32:30.009981, 10, pid=9336, effective(2310, 2049),
> real(2310, 0), class=acls] ../source3/smbd/posix_a
> cls.c:2737(canonicalise_acl)
>   canon_ace index 2. Type = allow SID = S-1-22-1-12477 uid 12477
> (pmurphy) SMB_ACL_USER_OBJ ace_flags = 0x0 perms rw
> -
> [2016/11/14 11:32:30.010484, 10, pid=9336, effective(2310, 2049),
> real(2310, 0), class=acls] ../source3/smbd/posix_a
> cls.c:848(print_canon_ace_list)
>   print_canon_ace_list: canonicalise_acl: ace entries after arrange
>   canon_ace index 0. Type = allow SID = S-1-22-1-12477 uid 12477
> (pmurphy) SMB_ACL_USER_OBJ ace_flags = 0x0 perms rw
> -
>   canon_ace index 1. Type = allow SID = S-1-22-2-9006 gid 9006
> (cvweb) SMB_ACL_GROUP_OBJ ace_flags = 0x0 perms rw-
>   canon_ace index 2. Type = allow SID = S-1-1-0 other SMB_ACL_OTHER
> ace_flags = 0x0 perms r--
> 
> 
> but I'll admit I'm not sure what I'm looking for.
> 
> On 11/10/16 1:13 PM, Josh Malone via samba wrote:
> >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.
> >
> 
> 
> -- 
> --------------------------------------------------------
>        Joshua Malone       Systems Administrator
>      (jmalone at nrao.edu)    NRAO Charlottesville
>         434-296-0263           www.nrao.edu
> 	434-249-5699 (mobile)
> --------------------------------------------------------
> 
> -- 
> To unsubscribe from this list go to the following URL and read the
> instructions:  https://lists.samba.org/mailman/options/samba

Josh Malone

2016-Nov-15 21:42 UTC

head link

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

On 11/10/16 1:13 PM, Josh Malone wrote:> 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

I cannot fix this under RHEL6. I've tried every version of samba back to 
4.0.

However - I just noticed that this bug DOESN'T occur on samba-gb. What's
the difference? I've tried 2 different systems in CV and the bug occurs. 
GB's smb.conf doesn't look very different from what I'm testing with
(colin.cv).

What gives, man?

-Josh

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

Josh Malone

2016-Nov-16 13:52 UTC

head link

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

Apologies - this was meant for an internal list :(

#include <embarrassment.h>
> However - I just noticed that this bug DOESN'T occur on samba-gb.
What's
> the difference? I've tried 2 different systems in CV and the bug
occurs.
> GB's smb.conf doesn't look very different from what I'm testing
with
> (colin.cv).
>
> What gives, man?
>
> -Josh
>

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

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