Re: SuSEFirewall2, libvirtd and opening ports with restrictions

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As I got no response regarding my first question, maybe my question
is better placed in -security.

So excuse the fullquote and toppost, and I hope gmane does not mess
up the F2up/Reply-To.

Thanks,
Johannes

On 09.05.15 Johannes Kastl wrote:
> Hi everyone,
> 
> as I happen to try this on my tumbleweed machine, I am asking on
> this list. But I think the basics apply to 13.{1,2} as well.
> 
> I know I can add 'special' iptables rules in 
> /etc/sysconfig/SuSEFirewall2 for the EXT firewall zone like
> this:
> 
>> FW_SERVICES_ACCEPT_EXT="192.168.178.2,tcp,22"
> 
> This would allow only the host 192.168.178.2 to reach the
> machine via ssh.
> 
> ############################ Question:
> ############################ How do I add such a special rule
> when I want to open the port on the virtual interfaces that
> libvirt uses?
> 
> I have setup libvirt with a nat network, which uses virbr0. As
> soon as a VM is startet, another interface vnet0 appears. So
> basically I want to open a port on whichever of these two
> interfaces is the right one.
> 
> Assuming that INT, EXT and DMZ are used otherwise, I know I
> could create an additional zone (for each of the interfaces)
> 
>> FW_ZONES="libvirt" FW_DEV_libvirt="vnet0" 
>> FW_SERVICES_ACCEPT_libvirt="192.168.2.2,tcp,22"
> 
> I would also have to set FW_ROUTE to yes, otherwise the VM does
> not get a connection to the hosts network and no route to the
> whole wide world.
> 
> But: This does not work in my setup.
> 
> I restarted SuSEfirewall2 and libvirt services, rebooted the VM,
> but no, no open port.
> 
> If I stop SuSEfirewall2, then the port can be reached, i.e. the
> ssh service is not the problem.
> 
> Any hints? Is there something I'm missing? Some error in my
> thinking?
> 
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