[Paraview] server configuration with two factor authentication?
Burlen Loring
burlen.loring at gmail.com
Fri Mar 20 17:42:22 EDT 2015
there are 2 places I used netcat.
1) ssh policy on login node only allows us to connect to ssh tunnels
from localhost. using ncat there fools ssh into thinking we are
connecting on localhost. I think it's dumb that we have to do this, but
our sys admins refuse to make the change. The ssh option is called
GatewayPorts.
2) there is a different network protocol used on the compute nodes of
our cray, the mom node understands that protocol and acts like a bridge
to the login node. we create the tunnel from mom to login with netcat.
there are other ways to forward the connections beside netcat, but it's
easy to build, install, and use, and it's fast.
On 03/20/2015 02:26 PM, Vanmoer, Mark W wrote:
>
> Hi Burlen,
>
> Are you using ncat to setup those connections because of a policy
> (like no outside network connections allowed) or for a technical reason?
>
> Mark
>
> *From:*Burlen Loring [mailto:burlen.loring at gmail.com]
> *Sent:* Thursday, March 19, 2015 4:48 PM
> *To:* Vanmoer, Mark W; David E DeMarle
> *Cc:* paraview at paraview.org
> *Subject:* Re: [Paraview] server configuration with two factor
> authentication?
>
> Hi Mark,
>
> Yes to both. The way this could work on a simple cluster is: from the
> user's system which is assumed to be remote, the pvsc creates an ssh
> tunnel inside the xterm and calls the launch script on the compute
> system login node. the launch script submits the batch job. pvserver,
> when run in the batch script, connects back to the ssh tunnel on the
> login node. "client host" is the login node host name. "server port"
> is specified by the user in the pvsc.
>
> There's a slight complication with some Cray systems that means we
> need to involve a special node called the "mom" node in the tunnel.
>
> This will be clear if you see a complete example, for instance the
> following 3 scripts are used with NERSC's Cray Edison:pvsc
> <https://github.com/burlen/pvserver-configs/blob/master/pvsc/edison-unix.pvsc>,
> launch script
> <https://github.com/burlen/pvserver-configs/blob/master/servers/edison/4.3.1/start_pvserver.sh>,
> batch script
> <https://github.com/burlen/pvserver-configs/blob/master/servers/edison/4.3.1/start_pvserver.qsub>.
>
> Burlen
>
> On 03/19/2015 02:24 PM, Vanmoer, Mark W wrote:
>
> This great, thanks for sharing, guys. Using xterm would have never
> occurred to me.
>
> Are you setting the pvserver –client-host somehow? My old pvsc
> from Forge sent over the client’s hostname to the script. I tried
> that on Blue Waters and it works, but do I not need to actually do
> that? Also, are either of you setting –server-port in the launch
> script?
>
> *From:*David E DeMarle [mailto:dave.demarle at kitware.com]
> *Sent:* Thursday, March 19, 2015 1:28 PM
> *To:* Burlen Loring
> *Cc:* Vanmoer, Mark W; paraview at paraview.org
> <mailto:paraview at paraview.org>
> *Subject:* Re: [Paraview] server configuration with two factor
> authentication?
>
> I liked this bit too as the windows version 'xterm -e ssh &'.
>
> <Command exec="cmd.exe" delay="10">
> <Arguments>
> <Argument value="/C"/>
> <Argument value="start"/>
> <Argument value="cmd.exe"/>
> <Argument value="/C"/>
> <Argument value="$SSH_EXEquot;/>
>
> Since windows isn't my first language, that took more hunting than
> I'ld like to admit. :)
>
>
> David E DeMarle
> Kitware, Inc.
> R&D Engineer
> 21 Corporate Drive
> Clifton Park, NY 12065-8662
> Phone: 518-881-4909
>
> On Thu, Mar 19, 2015 at 2:18 PM, Burlen Loring
> <burlen.loring at gmail.com <mailto:burlen.loring at gmail.com>> wrote:
>
> ""C:\Program Files (x86)\PuTTY\plink.exe""
>
>
>
> so that's the secret to paths with spaces! nice, thanks for sharing that!
>
> On 03/19/2015 09:22 AM, David E DeMarle wrote:
>
> Howdy Mark,
>
> Adding to what Burlen said.
>
> You can grab pvsc examples for ORNL, ANL and NERSC via
>
> paraview->File->Connect… Fetch servers.
>
> //File->Conenct…FetchServers->Edit Sources replace with
> pvsc http://www.paraview.org/files/pvscWindows Kitware
> Inc. on windows.
>
> Mac requires XQuartz, windows requires putty.
>
> Let me know when you get it working, with your permission
> I'ld love to add NCSA (and everywhere else) there so that
> users get it by default.
>
>
> David E DeMarle
> Kitware, Inc.
> R&D Engineer
> 21 Corporate Drive
> Clifton Park, NY 12065-8662
> Phone: 518-881-4909 <tel:518-881-4909>
>
> On Thu, Mar 19, 2015 at 11:56 AM, Burlen Loring
> <burlen.loring at gmail.com <mailto:burlen.loring at gmail.com>>
> wrote:
>
> Hi Mark,
>
> This works without anything special if you launch in
> an xterm. We did this at NICS which requires both ssh
> authentication and rsa secure id token. Here is an
> example
> <https://github.com/burlen/pvserver-configs/blob/master/pvsc/edison-unix.pvsc>
>
>
> Burlen
>
> On 03/19/2015 06:50 AM, Vanmoer, Mark W wrote:
>
> Hi, is there a way to set up the server XML so
> that it works with two factor authentication, as
> in a token generator? This is for the Blue Waters
> machine at NCSA. What I mean is, something like
> how VisIt acts, which when doing the connection
> will prompt for the password and token.
>
> In the past, on machines without two factor auth,
> I’ve used
>
> http://www.paraview.org/Wiki/ParaView:Server_Configuration#Case_Eleven:_Launch_pvserver_on_a_cluster_using_PBS_-_use_reverse_connection_to_client
>
> but that requires having ssh keys set up.
>
> Thanks,
>
> Mark
>
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