Return-Path: linux-nfs-owner@vger.kernel.org Received: from fieldses.org ([174.143.236.118]:50935 "EHLO fieldses.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756350Ab3KHQRO (ORCPT ); Fri, 8 Nov 2013 11:17:14 -0500 Date: Fri, 8 Nov 2013 11:17:07 -0500 To: Steve Dickson Cc: Jeff Layton , Chuck Lever , Trond Myklebust , Linux NFS Mailing list Subject: Re: [PATCH] Adding the nfs4_use_min_auth module parameter Message-ID: <20131108161707.GD3533@fieldses.org> References: <1383851364-8370-1-git-send-email-steved@redhat.com> <527C07B4.800@RedHat.com> <44CA89EA-8B5E-4B83-A622-78A78F760FF1@oracle.com> <527CDBFC.3070903@RedHat.com> <20131108082202.4032f1a2@tlielax.poochiereds.net> <527CFC72.2030907@RedHat.com> <20131108101232.10d49851@tlielax.poochiereds.net> <527D0CE6.2020401@RedHat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii In-Reply-To: <527D0CE6.2020401@RedHat.com> From: "J. Bruce Fields" Sender: linux-nfs-owner@vger.kernel.org List-ID: On Fri, Nov 08, 2013 at 11:10:14AM -0500, Steve Dickson wrote: > > > On 08/11/13 10:12, Jeff Layton wrote: > > On Fri, 08 Nov 2013 10:00:02 -0500 > > Steve Dickson wrote: > > > >> > >> > >> On 08/11/13 08:22, Jeff Layton wrote: > >>> On Fri, 08 Nov 2013 07:41:32 -0500 > >>> Steve Dickson wrote: > >>> > >>>> > >>>> > >>>> On 07/11/13 18:05, Chuck Lever wrote: > >>>>> > >>>>> On Nov 7, 2013, at 1:35 PM, Steve Dickson wrote: > >>>>> > >>>>>> Hey mrchuck... > >>>>>> > >>>>>> On 07/11/13 14:25, Chuck Lever wrote: > >>>>>>> Hi Steve- > >>>>>>> > >>>>>>> On Nov 7, 2013, at 11:09 AM, Steve Dickson wrote: > >>>>>>> > >>>>>>>> This new module parameter makes the v4 client > >>>>>>>> use the minimal authentication flavor (AUTH_UNIX) > >>>>>>>> when establishing NFSV4 state and doing the > >>>>>>>> pseudoroot lookup > >>>>>>> > >>>>>>> The patch description doesn't say, but is this change to work > >>>>>>> around the 15 second GSSD upcall timeout? > >>>>>> Yes. A 15 second delay on every mount due to security that > >>>>>> nobody is requesting is just not good.. IMHO.. > >>>>> > >>>>> One thing we haven't discussed is reducing the upcall timeout to 5 seconds or less, > >>>>> as a form of immediate relief. 15 seconds is arbitrary, and is onerous even when > >>>>> you expect the mount to work (ie why would it be good for any properly configured > >>>>> environment to take 15 seconds to establish a GSS context?). > >>>>> > >>>>> In other words, there are still cases where users wait 15 seconds unnecessarily, > >>>>> and not because of the use of krb5i for lease management. Aren't those of concern? > >>>> No. I think the concern here, at least my concern, is the lack of management. > >>>> We are forcing admins to use krb5i in lease management when its not necessary > >>>> and there is no way to turn it off. > >>>> > >>> > >>> I don't think that's really the case. The idea was to have the client > >>> attempt to use krb5i if it's available, and then to fall back to > >>> AUTH_SYS if it isn't. This would be *absolutely* no big deal if the > >>> GSSAPI upcall succeeded or failed immediately instead of requiring this > >>> timeout when the daemon isn't running. > >> What server makes krb5i available today in state setup and pseudoroot lookups? > >> > > > > That I don't know...sorry... > Then what is the justification to take all these extra steps > there they going to fail %100 of the time?? Any server can support krb5 for state setup and pseudoroot operations if it's configured. This isn't a problem. --b.