Return-Path: linux-nfs-owner@vger.kernel.org Received: from partagas.dragonet.es ([217.70.240.130]:52810 "EHLO partagas.dragonet.es" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932099Ab2BBO47 (ORCPT ); Thu, 2 Feb 2012 09:56:59 -0500 Message-ID: <4F2AA430.2040109@steve-ss.com> Date: Thu, 02 Feb 2012 15:56:48 +0100 From: steve MIME-Version: 1.0 To: tigran.mkrtchyan@desy.de CC: linux-nfs@vger.kernel.org Subject: Re: nfs4 keytabs [was:Re: where can I ask user qns about nfs4]? References: <4F2A2F9E.6030908@steve-ss.com> <4F2A74A7.4060905@steve-ss.com> <4F2A8FBC.1010101@steve-ss.com> In-Reply-To: <4F2A8FBC.1010101@steve-ss.com> Content-Type: text/plain; charset=UTF-8; format=flowed Sender: linux-nfs-owner@vger.kernel.org List-ID: On 02/02/12 14:29, steve wrote: > On 02/02/2012 02:05 PM, Tigran Mkrtchyan wrote: >> On Thu, Feb 2, 2012 at 12:33 PM, steve wrote: >>> On 02/02/12 11:58, Tigran Mkrtchyan wrote: >>>> Hi Steve, >>>> >>>>> I already use nfs4 to serve my Linux clients. I'm going to >>>>> kerberize it. >>>>> My >>>>> clients already have machine and host principals. What else do >>>>> they need? >>>>> >>>>> 1. nfs/client.domain.name >>>>> 2. nfs/server.domain/name >>>>> 3. neither >>>>> 4. both >>>>> >>>> We run kerberized NFS. >>>> >>>> our keytab contains: >>>> >>>> on server; >>>> nfs/server.domain >>>> >>>> on client: >>>> nfs/client.domain >>>> >>>> and, of course, you need a consistent idmap configuration. >>>> >>>> Tigran. >>>> >>> Hi Tigran >>> >>> That's what we have on our test lan at the moment. I can understand >>> that the >>> server would need the service principal: >>> nfs/server.domain >>> but not the client, as it's not offering any kerberized service. >> The mount step happens on behalf of host as there are no user >> requests yet. >> Client host credentials are used at that time. >> >>> As an experiment, I removed the nfs/client.domain from a client keytab, >>> rebooted and remounted the share. We could still access the >>> kerberized nfs >>> share. Maybe there were still some tickets left somewhere? That has me >>> really confused. >> Huh! did you enforce kerberos in /etc/exports? >> > Yes. /etc/exports exports as gss/krb5 > I made a screenshot: > > http://3.bp.blogspot.com/-g40b11Ys_DA/TypYtlO-ixI/AAAAAAAAAIc/cZdeRhnVuY4/s1600/s4all.png > > > That's why I'm confused. > Steve Digging a bit further, here is the output of mount on the client: http://dl.dropbox.com/u/45150875/krb5testnfs.png And this appears immediately after the mount: http://dl.dropbox.com/u/45150875/krb5nfstmp.png Most of the documentation tells you to stick nfs into the client keytab as well as the server keytab, but here, I only have the principal on the server. What am I missing? Thanks, Steve