On Thu, Sep 25, 2014 at 3:29 AM, Anton Altaparmakov <aia21@xxxxxxxxx> wrote: > Hi Steve, > > On 25 Sep 2014, at 07:04, Steve French <smfrench@xxxxxxxxx> wrote: >> Did some experiments today to see how mode bits are stored by the >> Windows NFS server in the RichACL (CIFS or NFS ACL). mounted nfsv4.1 >> to Windows from Linux then created a bunch of files and did chmod of >> various combinations of 07777 bits (including sticky, setuid etc.) >> >> Windows NFS server is storing the user owner bits with SID >> S-1-5-88-1 and using SID S-15-88-2 for group owner and S-1-5-88-4 for >> the ACE for "other" (this is easy to spot over CIFS/SMB3 etc because >> user owner and group owner map to these SIDs in the security >> descriptor returned over the wire). >> >> As expected, for each of the 3 ACEs, it is setting "GENERIC_READ" in >> the ACE for '4' (read) and GENERIC_WRITE for '2' (write) and >> GENERIC_EXECUTE for '1' (execute). What is puzzling is where it >> stores the setuid and sticky bits (bits 07000) because they are not >> visible in the CIFS/NTFS ACL. > > As far as I know the Windows NFS server user "Services For Unix (SFU)" and those special bits are stored on NTFS in an Extended Attribute (EA) (note this is the $EA attribute not a named stream/named $DATA attribute on NTFS). I wrote about this 9 years ago on linux-ntfs-dev mailing list. Archive post is here (read my point "2" in that post for the details): > > http://marc.info/?l=linux-ntfs-dev&m=112965244715312 > > This means that those bits only take effect / have any significance for applications using the Windows POSIX subsystem (e.g. NFS server and Cygwin), i.e. normal Win32 based apps will not be affected by them at all. > I did a getfattr to list all the windows (os/2) exstended attributes (over cifs) and didn't see it, perhaps it is hidden - but I can query for SETFILEBITS directly -- Thanks, Steve -- To unsubscribe from this list: send the line "unsubscribe linux-cifs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
