Date: Thu, 28 Mar 2024 11:46:18 +0100 From: Andreas Kempe <kempe@lysator.liu.se> To: Rick Macklem <rick.macklem@gmail.com> Cc: freebsd-fs@freebsd.org Subject: Re: Kerberised NFSv4 - everyone gets mapped to nobody on file access Message-ID: <ZgVKehV_9ePUBdwd@shipon.lysator.liu.se> In-Reply-To: <CAM5tNy68W16ut4vR1Y9xxPwaU%2BT%2Bt8fU8dwg3DbfhMT5h5iEDQ@mail.gmail.com> References: <ZgNiZsYl6D-GnRwI@shipon.lysator.liu.se> <CAM5tNy53suTizsOmsKvN9Zrd6LciAFrS3PEctUJjK%2BHH9QcMrw@mail.gmail.com> <CAM5tNy7YM6bRKTX3pLR8hC-a-cmxXA=wv4j0E8cBWGthbxzLdQ@mail.gmail.com> <ZgRUqkl1zVxMPt6K@shipon.lysator.liu.se> <CAM5tNy68W16ut4vR1Y9xxPwaU%2BT%2Bt8fU8dwg3DbfhMT5h5iEDQ@mail.gmail.com>
next in thread | previous in thread | raw e-mail | index | archive | help
On Wed, Mar 27, 2024 at 03:20:03PM -0700, Rick Macklem wrote: > On Wed, Mar 27, 2024 at 10:17 AM Andreas Kempe <kempe@lysator.liu.se> wrote: > > > > On Tue, Mar 26, 2024 at 05:54:38PM -0700, Rick Macklem wrote: > > > On Tue, Mar 26, 2024 at 5:33 PM Rick Macklem <rick.macklem@gmail.com> wrote: > > > > > > > > Take a look at a packet capture in wireshark. > > > > Check that the @domain part of Owner and Owner_group attributes are > > > > the same and it is not a string of digits. > > > Oh, and just fyi, you can use tcpdump to capture the packets, something like: > > > # tcpdump -s 0 -w out.pcap host <nfs-server> > > > and then you can look at out.pcap whereever it is convenient to > > > install wireshark. > > > (I run it on this windows laptop.) > > > Don't bother to try and look at NFS with tcpdump. It doesn't know how > > > to decode it. > > > > > > > If the domain is not the same, you can use the -domain command line option > > > > on nfsuserd to set it. > > > > (Since this "domain" is underdefined, I'd suggest only ascii characters and > > > > all alphabetics in lower case.) > > > > If the client sends a string of digits, check to make sure the sysctl > > > > vfs.nfs.enable_uidtostring is set to 0. > > > > > > > > I'm using lysator.liu.se as the domain on both client and server. It > > seems to work since listing files give correct owners. > > > > I have dumped the traffic from mounting and creating a file named > > test file that shows up as owned by nobody. I get the following call > > made > > > > NFS 438 V4 Call (Reply In 131) Open OPEN DH: 0x30a4c0aa/testfil > > > > In the OPEN (18) opcode, owner is set to > > > > 0000 af 16 00 00 93 fc 00 00 07 76 0d 00 > > > > while the server sets owner to ex. kempe@lysator.liu.se as expected > > when directory listings are made. > Doesn't make sense. What does wireshake show you for the Owner > attribute in the setable attributes of the Open arguments. It should flag > it as non-UTF8. > I'm afraid I don't really understand how to check this. Wireshark secifies "owner: <DATA>" if that says anything. > If you email me the pcap.out as an attachment, I'll look at it in wireshark. > The out.pcap should include both the Open that creates a file and an > "ls -l <file>", so there is a Getattr for the file as well. > I'll send you a capture off-list. Thank you for helping! > rick > ps: If that is what is in the Owner field, all I can suggest is that was what > a getpwnam() returned on the client. Possibly some weirdness with LDAP. > (I never use LDAP. Only a local /etc/passwd.) > > > > > vfs.nfs.enable_uidtostring is 0 on the client machine and I am not > > quite able to make sense of what the 12 bytes in the owner field are > > supposed to be. They are not the ASCII representation and nither my > > user's GID and UID that are both 0x7b02. > > > > // Andreas Kempe >
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?ZgVKehV_9ePUBdwd>