Re: nfs xprtsec conflicting with squashing

Patrick M.
2024-10-22T14:36:30Z

Hello,

will give it a try on 6.11 server side and raise a bug if it does not - will most likely not happen before tomorrow.
Thanks for the fast reply

On Tue, 22 Oct 2024 14:17:18 +0000
Chuck Lever III <chuck.lever@oracle.com> wrote:

> > On Oct 22, 2024, at 9:50 AM, Patrick M. <s7mon@web.de> wrote:
> >
> >
> > Hi there,
> >
> > tried switching to nfs with kernel TLS (mTLS to be specific).
> > Without xprtsec i was able to use the following options on exports
> >
> > "rw,async,all_squash,no_subtree_check,anonuid=1000,anongid=100,fsid=6,sec=sys"
> >
> > but both the squashing/mapping-ids seems to conflict with TLS and i wanted to understand if this is by intention or a bug.
>
> I don't expect breakage like this, so at least some further
> triage is needed. Can you open a bug on bugzilla.kernel.org
> under the Filesystem/NFSD component?
>
> You can also verify that this behavior recurs with a 6.11 (or
> later) kernel on your NFS server.
>
>
> > And if it is by intention of course why - because in my understanding auth and encryption of the mount itself would not contradict with the mapping functionality.
> >
> > I now use "rw,async,no_subtree_check,fsid=6,sec=sys,xprtsec=mtls" and it is working. Using no_root_squash also seems to conflict.
> >
> > Keeping ID-Mapping i get this on client side
> >
> > mount.nfs: Operation not permitted for server:/mnt/target on /mnt/target
> >
> > And nothing i could relate as cause on server side (happy to provide specific logs if needed, even with nfsd or rpc flags with rpcdump i could not see a cause).
> > Tlshd showed also succes in both scenarios (handshake successfull) and i can use all options as well if i remove the xprtsec on server side.
> >
> > Client:
> > Linux 6.11.
> > nfs-utils-2.7.1
> >
> > Server:
> > Linux 6.5.52
> > nfs-utils-2.7.1
> >
> > Sorry if i missed this in documentation, if so i'd appreciate the hint where i should look in detail
> > and thanks for this feature!
> >
> >
> > --
> > best regards
> > Patrick M.
> >
>
> --
> Chuck Lever
>
>

--
Patrick Münch <s7mon@web.de>