FAT, NTFS, CIFS and DOS attributes

[H. Peter Anvin]

tridge at samba.org wrote:
> Mike,
> 
>  > If we're just thinking about MS-oriented discretionary access control then
>  > I think the owner of the file is basically king and should be the only
>  > normal user to that can read and write it's xattrs. So whatever namespace
>  > that is (not system).
> 
> for the DACL the owner is king (the owner gets the WRITE_DAC,
> READ_CONTROL and STD_DELETE access bits forced on), but for the other
> parts of the full security descriptor this is not true. The owner
> doesn't get to arbitrarily write to the owner_sid or SACL. Thats why I
> used security.NTACL not user.NTACL.
> 
> I suppose we could have a separate user.DACL attribute, but given that
> there is just one API that sets all 4 elements of the SD (with a
> bitmask to say which bits to set), it made more sense to me to group
> them all together. The disadvantage is that Samba needs to gain/lose
> root privileges for the "set SD" call even if the client is only
> asking to set the DACL.
> 

Even more so a reason for this not to be a general API.

	-hpa