Re: [nfsv4] Fwd: New Version Notification for draft-haynes-nfsv4-flex-filesv2-00.txt

Benjamin Kaduk <kaduk@mit.edu> Mon, 28 August 2017 19:45 UTC

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Date: Mon, 28 Aug 2017 14:45:18 -0500
From: Benjamin Kaduk <kaduk@mit.edu>
To: "J. Bruce Fields" <bfields@fieldses.org>
Cc: Olga Kornievskaia <aglo@citi.umich.edu>, "nfsv4@ietf.org" <nfsv4@ietf.org>, Thomas Haynes <loghyr@primarydata.com>
Message-ID: <20170828194518.GI96685@kduck.kaduk.org>
References: <150215110527.12392.18161698955589691126.idtracker@ietfa.amsl.com> <2CA259E3-BD3A-482B-BFBF-3B90425AD3EA@primarydata.com> <CAN-5tyETNMCPVC5wJ-_77vM5+hVB+-uasd37kn+M=hoCeK6P7w@mail.gmail.com> <CAABAsM6rmrDU4BR6Ho7YFjjYA2amEkwuRGtzN537VXUZ-Eh-hg@mail.gmail.com> <20170808185803.GQ70977@kduck.kaduk.org> <CAABAsM7xOpbopPa3v1YMtfcFZbNZ=Jygap37Bg6qGfDDAvRHhQ@mail.gmail.com> <CAN-5tyHz1cqSWyv1hVMvzaqSr1W0V0_drz3BvzxHWDyM5w+spw@mail.gmail.com> <20170808203145.GS70977@kduck.kaduk.org> <CAN-5tyHR80V1Fi3GZJ5u=FsxQ5va=Ka2qTCmHZ48PikURYjwGw@mail.gmail.com> <20170828175805.GA3393@fieldses.org>
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Subject: Re: [nfsv4] Fwd: New Version Notification for draft-haynes-nfsv4-flex-filesv2-00.txt
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On Mon, Aug 28, 2017 at 01:58:05PM -0400, J. Bruce Fields wrote:
> 
> The Linux server's gss processing is done in ignorance of any protocol
> below that layer, and I can't think of a reason why we wouldn't accept a
> gss context from a different IP address.
> 
> The split between kernel and rpc.gssd means that the Linux client always
> does context initialization over a different connection from normal data
> exchanges, so we can be pretty sure servers deal with that at least.

Thanks for the details.

> But I guess that wouldn't prevent other servers from binding the context
> to a particular connection or IP address after that.  I don't think the
> specs say anything either way.

It's really something that would be specified at the (GSS) mechanism
layer, I think.  And Kerberos has generally moved away from address
restrictions since they fail in the presence of (e.g., residential) NAT.

-Ben