not sure, if we are ready to talk/ distribute pnfs4.1 experiences here..
I know one customer doing pNFS and for myself , we did a lot of testing here
please contact me directly .. let's see, how I can help ..
From: Aaron Knister <aaron.s.knis...@nasa.gov>
To: <gpfsug-discuss@spectrumscale.org>
Date: 09/08/2017 11:14 PM
Subject: Re: [gpfsug-discuss] multicluster security
Sent by: gpfsug-discuss-boun...@spectrumscale.org
Interesting! Thank you for the explanation.
This makes me wish GPFS had a client access model that more closely mimicked parallel NAS, specifically for this reason. That then got me wondering about pNFS support. I've not been able to find much about that but in theory Ganesha supports pNFS. Does anyone know of successful pNFS testing with GPFS and if so how one would set up such a thing?
-Aaron
On 08/25/2017 06:41 PM, IBM Spectrum Scale wrote:
Hi Aaron,
If cluster A uses the mmauth command to grant a file system read-only access
to a remote cluster B, nodes on cluster B can only mount that file system
with read-only access. But the only checking being done at the RPC level
is the TLS authentication. This should prevent non-root users from initiating
RPCs, since TLS authentication requires access to the local cluster's private
key. However, a root user on cluster B, having access to cluster B's private
key, might be able to craft RPCs that may allow one to work around the
checks which are implemented at the file system level.
Regards, The Spectrum Scale (GPFS) team
------------------------------------------------------------------------------------------------------------------
If you feel that your question can benefit other users of Spectrum Scale
(GPFS), then please post it to the public IBM developerWroks Forum at https://www.ibm.com/developerworks/community/forums/html/forum?id=11111111-0000-0000-0000-000000000479.
If your query concerns a potential software error in Spectrum Scale (GPFS)
and you have an IBM software maintenance contract please contact 1-800-237-5511
in the United States or your local IBM Service Center in other countries.
The forum is informally monitored as time permits and should not be used
for priority messages to the Spectrum Scale (GPFS) team.Aaron
Knister ---08/21/2017 11:04:06 PM---Hi Everyone, I have a theoretical question
about GPFS multiclusters and security.
From: Aaron Knister <aaron.s.knis...@nasa.gov>
To: gpfsug main discussion list <gpfsug-discuss@spectrumscale.org>
Date: 08/21/2017 11:04 PM
Subject: [gpfsug-discuss] multicluster security
Sent by: gpfsug-discuss-boun...@spectrumscale.org
Hi Everyone,
I have a theoretical question about GPFS multiclusters and security.
Let's say I have clusters A and B. Cluster A is exporting a filesystem
as read-only to cluster B.
Where does the authorization burden lay? Meaning, does the security rely
on mmfsd in cluster B to behave itself and enforce the conditions of the
multi-cluster export? Could someone using the credentials on a
compromised node in cluster B just start sending arbitrary nsd
read/write commands to the nsds from cluster A (or something along those
lines)? Do the NSD servers in cluster A do any sort of sanity or
security checking on the I/O requests coming from cluster B to the NSDs
they're serving to exported filesystems?
I imagine any enforcement would go out the window with shared disks in a
multi-cluster environment since a compromised node could just "dd" over
the LUNs.
Thanks!
-Aaron
--
Aaron Knister
NASA Center for Climate Simulation (Code 606.2)
Goddard Space Flight Center
(301) 286-2776
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