Can't read/write my mounted smbfs share

android-eve · 01-31-2011, 10:19 AM

I am trying to smbmount a Samba share to be used on my Ubuntu 10.04 desktop.

I created a mount point

Code:

sudo mkdir /mnt/smb-sambaserv-myshare

and added the following to my fstab:

Code:

//sambaserv/myshare /mnt/smb-sambaserv-myshare cifs credentials=/home/androideve/.smbcredentials,iocharset=utf8,file_mode=0777,dir_mode=0777 0 0

I of course added the right credentials to /home/androideve/.smbcredentials and it mounts well but...

I can't really read and write to the folders inside the share.

What am I doing wrong?

ozanbaba · 01-31-2011, 10:55 AM

try umask=0000 instead of file_mode and dir_mode. You can try using uid and guid as well.

android-eve · 01-31-2011, 07:25 PM

Quote:

Originally Posted by ozanbaba

try umask=0000 instead of file_mode and dir_mode.

I tried. It, of course, didn't work. It has to do with the fact that /etc/fstab entries are mounted by root, while I am logged in as androideve. How do I work around that?

android-eve · 01-31-2011, 07:51 PM

Quote:

Originally Posted by ozanbaba

You can try using uid and guid as well.

On the other hand, setting uid and guid in /etc/fstab per the mount.cifs man page, finally allowed me to start seeing what's in the share.

The only problem is that I need to do "sudo mount" instead of just "mount". Is there a way to work around that?

ozanbaba · 02-01-2011, 03:06 AM

Quote:

Originally Posted by android-eve

On the other hand, setting uid and guid in /etc/fstab per the mount.cifs man page, finally allowed me to start seeing what's in the share.

The only problem is that I need to do "sudo mount" instead of just "mount". Is there a way to work around that?

user option in fstab, It allows user to mount the entries.

android-eve · 02-01-2011, 09:27 AM

Quote:

Originally Posted by ozanbaba

user option in fstab, It allows user to mount the entries.

Thanks. That indeed allows executing that entry in /etc/fstab but now I get a new error:

Code:

mount error: permission denied or not superuser and mount.cifs not installed SUI

This is despite the fact that I took care of the SUID by doing:

Code:

sudo chmod +s /usr/bin/smbmount
sudo chmod +s /usr/bin/smbumount
sudo chmod +s /sbin/mount.cifs
sudo chmod +s /sbin/umount.cifs

What do I do to finally make this work?

ozanbaba · 02-01-2011, 09:40 AM

how about mount ?

android-eve · 02-01-2011, 09:57 AM

Quote:

Originally Posted by ozanbaba

how about mount ?

I just did that, too:

Code:

sudo chmod +s `which mount`
ls -la `which mount`
-rwsr-sr-x 1 root root 82256 2011-01-20 14:56 /bin/mount

But I still get this error:

Code:

mount error: permission denied or not superuser and mount.cifs not installed SUID

Why is so difficult to make smbfs/CIFS usable on Ubuntu 10? (root-only mount is NOT useful to me, because the shares on my Samba server are not exported as 'root').

What do I do now?

ozanbaba · 02-01-2011, 10:02 AM

Thinkg is only mount should have SUID. Rest of the commands are run by mount as root. (That's reason mount is in /bin/mount while mount.* is in /sbin)

android-eve · 02-01-2011, 05:50 PM

Well, I made some progress by trying:

Code:

mount.cifs //sambaserv/myshare /mnt/smb-sambaserv-myshare -o setuids -user=remoteuser

and it mounted, magically making the local desktop user the owner of that entire mount (including newly created files), while at the same time those newly created files have the remote user as their owner on the remote system! It looks very promising but it doesn't work yet because if I try to edit a newly such created file, the local system says:

Quote:

Could not open the file... You do not have the permissions necessary to open the file.

This is weird since it's -rw- on both systems for both usernames!

On the remote server (when I SSH to it) I see:

Code:

/home/share/workspace> ls -la empt*
-rw-rw----  1 remoteuser remoteuser 9 Feb  1 18:50 empty-file.txt

On the local system (with that share mounted) I see:

Code:

androideve@desktop:/mnt/smb-sambaserv-myshare/workspace$ ls -la empt*
-rw-rw---- 1 androideve androideve 9 2011-02-01 18:50 empty-file.txt

Yet, there is no way I can locally open empty-file.txt for either read or write!

This drives me crazy...

Why is this happening and how do I nail it once and for all?

android-eve · 02-01-2011, 08:45 PM

Update: I went through the whole ordeal of creating another user with the same uid/gid as the one on the remote server, just to experience the same problem. This time I had no choice, I had to find an explanation for this weird "permission denied" error. So I looked at /var/log. Sure enough, kern.log shows:

Code:

Status code returned 0xc0000022 NT_STATUS_ACCESS_DENIED
 CIFS VFS: Send error in read = -13.

This helped me find a description of the same exact problem here:
http://www.fedoraforum.org/forum/showthread.php?t=100193

And... this is the explanation for the mystery: http://www.fedoraforum.org/forum/sho...1&postcount=26

ozanbaba · 02-02-2011, 02:21 AM

Quote:

Originally Posted by android-eve

Code:

Status code returned 0xc0000022 NT_STATUS_ACCESS_DENIED
 CIFS VFS: Send error in read = -13.

If everything looks okay with permissions, then check out the server configurations