[gentoo-user] [OT] NFS through a firewall

[gentoo-user] [OT] NFS through a firewall

[Roger Mason]

Hello,

I'm trying to configure the firewall on a client to allow that client
to mount an nfs directory.  The client runs a netfilter firewall, the
server uses tcpwrapper.

rpcinfo -p on the server shows:

beryl rmason # rpcinfo -p
   program vers proto   port
    100000    2   tcp    111  portmapper
    100000    2   udp    111  portmapper
    100024    1   udp  32765  status
    100024    1   tcp  32765  status
    100003    2   udp   2049  nfs
    100003    3   udp   2049  nfs
    100003    2   tcp   2049  nfs
    100003    3   tcp   2049  nfs
    100021    1   udp   4001  nlockmgr
    100021    3   udp   4001  nlockmgr
    100021    4   udp   4001  nlockmgr
    100021    1   tcp   4001  nlockmgr
    100021    3   tcp   4001  nlockmgr
    100021    4   tcp   4001  nlockmgr
    100005    1   udp  32767  mountd
    100005    1   tcp  32767  mountd
    100005    2   udp  32767  mountd
    100005    2   tcp  32767  mountd
    100005    3   udp  32767  mountd
    100005    3   tcp  32767  mountd

When I try to mount the exported directory when the firewall is
running I get a timeout:

minnie ~ $ mount -v Help/
mount: trying 134.153.37.5 prog 100003 vers 3 prot tcp port 2049
mount: trying 134.153.37.5 prog 100005 vers 3 prot udp port 32767
mount: mount to NFS server 'beryl.esd.mun.ca' failed: timed out
(retrying).

If I drop the client firewall the mount succeeds.

Can someone help me figure out what must be put in my iptables script
to get this to work?

Thanks,
Roger
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Re: [gentoo-user] [OT] NFS through a firewall

[Greg Bowser]

Please excuse my possible lack of coherency; I have yet to have any
coffee, and I just mediated a battle on IRC, so mehhh

I had a very similar experience a few weeks back. There's that problem
with the thing where the thing is like "hey, Imma use this random
port" and then the other thing is like "oh no you diint".  So then
they fight about it.  I have debian boxes (against my wishes) and
gentoo boxes in my mix.

The following article was of great use to me:
http://wiki.debian.org/SecuringNFS
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Re: [gentoo-user] [OT] NFS through a firewall

[Etaoin Shrdlu]

On Friday 11 April 2008, 15:49, Roger Mason wrote:

> Hello,
>
> I'm trying to configure the firewall on a client to allow that client
> to mount an nfs directory.  The client runs a netfilter firewall, the
> server uses tcpwrapper.

http://marc.info/?l=gentoo-user&m=120546886304830&w=2
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Re: [gentoo-user] [OT] NFS through a firewall

[Hamie]

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On Friday 11 April 2008 13:49:11 Roger Mason wrote:
> Hello,
>
> I'm trying to configure the firewall on a client to allow that client
> to mount an nfs directory.  The client runs a netfilter firewall, the
> server uses tcpwrapper.

[deleted]

>
> If I drop the client firewall the mount succeeds.
>
> Can someone help me figure out what must be put in my iptables script
> to get this to work?
>

Do you have the option to run nfsv4? It uses only port tcp-2049. That way you 
don't need portmapper (port 111), lockmgr, status, or mountd.

Hamish.

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Re: [gentoo-user] [OT] NFS through a firewall

[Dan Farrell]

On Fri, 11 Apr 2008 11:19:11 -0230
Roger Mason <rmason@esd.mun.ca> wrote:

> Hello,
> 
> I'm trying to configure the firewall on a client to allow that client
> to mount an nfs directory.  The client runs a netfilter firewall, the
> server uses tcpwrapper.
> 
> rpcinfo -p on the server shows:
> 
> beryl rmason # rpcinfo -p
>    program vers proto   port
>     100000    2   tcp    111  portmapper
>     100000    2   udp    111  portmapper
>     100024    1   udp  32765  status
>     100024    1   tcp  32765  status
>     100003    2   udp   2049  nfs
>     100003    3   udp   2049  nfs
>     100003    2   tcp   2049  nfs
>     100003    3   tcp   2049  nfs
>     100021    1   udp   4001  nlockmgr
>     100021    3   udp   4001  nlockmgr
>     100021    4   udp   4001  nlockmgr
>     100021    1   tcp   4001  nlockmgr
>     100021    3   tcp   4001  nlockmgr
>     100021    4   tcp   4001  nlockmgr
>     100005    1   udp  32767  mountd
>     100005    1   tcp  32767  mountd
>     100005    2   udp  32767  mountd
>     100005    2   tcp  32767  mountd
>     100005    3   udp  32767  mountd
>     100005    3   tcp  32767  mountd
> 
> When I try to mount the exported directory when the firewall is
> running I get a timeout:
> 
> minnie ~ $ mount -v Help/
> mount: trying 134.153.37.5 prog 100003 vers 3 prot tcp port 2049
> mount: trying 134.153.37.5 prog 100005 vers 3 prot udp port 32767
> mount: mount to NFS server 'beryl.esd.mun.ca' failed: timed out
> (retrying).
> 
> If I drop the client firewall the mount succeeds.
> 
> Can someone help me figure out what must be put in my iptables script
> to get this to work?

Accept all incoming and outgoing connections on the client that
originate from or go to the server.  It would look something like this:

iptables -I INPUT -s 134.153.37.55 -j ACCEPT
iptables -I INPUT -s 134.153.37.55 -j ACCEPT

now make sure those will work with your config before just blindly
setting them up!  

Best of luck!  Hope it works.  

		-- Dan
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Re: [gentoo-user] [OT] NFS through a firewall

[Roger Mason]

Hello,

Dan Farrell <dan@spore.ath.cx> writes:

> On Fri, 11 Apr 2008 11:19:11 -0230
> Roger Mason <rmason@esd.mun.ca> wrote:
>
>> Hello,
>> 
>> I'm trying to configure the firewall on a client to allow that client
>> to mount an nfs directory.  The client runs a netfilter firewall, the
>> server uses tcpwrapper.
>> 
>> Can someone help me figure out what must be put in my iptables script
>> to get this to work?

[snip]

>
> Accept all incoming and outgoing connections on the client that
> originate from or go to the server.  It would look something like this:
>
> iptables -I INPUT -s 134.153.37.55 -j ACCEPT
> iptables -I INPUT -s 134.153.37.55 -j ACCEPT
>
> now make sure those will work with your config before just blindly
> setting them up!  

Thank you, this works:

> iptables -I INPUT  -s 134.153.37.55 -j ACCEPT
> iptables -I OUTPUT -s 134.153.37.55 -j ACCEPT

Many thanks to all who replied.

Roger
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Re: [gentoo-user] [OT] NFS through a firewall

[Roger Mason]

Hamie <hamish@travellingkiwi.com> writes:

> On Friday 11 April 2008 13:49:11 Roger Mason wrote:
>> Hello,
>>
>> I'm trying to configure the firewall on a client to allow that client
>> to mount an nfs directory.  The client runs a netfilter firewall, the
>> server uses tcpwrapper.
>
> Do you have the option to run nfsv4? It uses only port tcp-2049. That way you 
> don't need portmapper (port 111), lockmgr, status, or mountd.

Not at the moment: the server is running a very old (obsolete)
profile, so it is hard to update.  A complete rebuild is on my agenda,
but I won't get to it for a few weeks.

It looks like a good solution though.

Cheers,
Roger
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Re: [gentoo-user] [OT] NFS through a firewall

[Enrico Weigelt]

* Etaoin Shrdlu <shrdlu@unlimitedmail.org> wrote:
> On Friday 11 April 2008, 15:49, Roger Mason wrote:
> 
> > Hello,
> >
> > I'm trying to configure the firewall on a client to allow that client
> > to mount an nfs directory.  The client runs a netfilter firewall, the
> > server uses tcpwrapper.
> 
> http://marc.info/?l=gentoo-user&m=120546886304830&w=2

BTW: if you don't actually *need* NFS, but just some network
filesystem, you might want to try 9P.


cu
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Re: [gentoo-user] [OT] NFS through a firewall

[Roger Mason]

Enrico Weigelt <weigelt@metux.de> writes:

>
> BTW: if you don't actually *need* NFS, but just some network
> filesystem, you might want to try 9P.

I finally got this solved with some help from this list.

Your comment about the 9P filesystem is interesting as I'm somewhat
interested in an operating system for a cluster, and the 9P operating
system, from what I've read, was designed as a distributed system from
the start.  It is a pity there seems to have been so little software
ported to run on it.  I've also played a little with xcpu
(http://xcpu.org/) and may install that in the summer.

Cheers,
Roger
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