samba write only share from windows

Question

I have a samba share which I want to write too but not be able to read.

[writeonly]
path = /writeonly
read only = no
create mask = 0772
guest ok = yes
guest account = gpcw
hide unreadable = yes
public = yes
browsable = no
writeable = yes
force user = gpcw

The permissions on the folder (owned by root) are 0772 which I understand to mean rwx for root:root and -w- for any other user.

I can mount the share from a windows server using net use v: \\server\writeonly but when I try to write I get permission denied.

If I change the unix permission to 0776 or 0777 I can write to the folder, but it unfortunately becomes readable.

My question is this, am I looking at a quirk of how windows maps samba folders in that it requires a read before it can write or is there something more significant likely to be happening?

Answer 1

I just did it by sharing the folder normally (to the Guest user) and then simply changing the folder's permissions to allow write and deny read to Guest, like so:

In my case it can also be accessed from OS X, where the Windows' shared folder is mounted but it looks empty/unopenable. This message pops up when copy files to it:

If you need to share it from an OS other than Windows, look for ACL in your OS.