8:25 a.m.
Good people of the community,
Hope you are all doing well. We are exploring the network filters in oVirt to check if we
can implement a zero-trust model at the network level. The intention is to have a filter
which takes two parameters, IP and PORT. After that there will be a 'deny all'
rule. We realized that none of the default network filters offer such a functionality and
the only option is to write a custom filter.
Why don't we have such a filter in libvirt and thereby in oVirt? Someone would've
already thought about such a use case. So I was thinking maybe network filters aren't
meant to be used for implementing such functionalities like zero-trust?
Also what are some practical use cases of the default filters that are provided? I was
able to understand and use the clean-traffic and clean-traffic-gateway.
Regards,
ravi
9:14 a.m.
On Wed, Feb 9, 2022 at 6:54 AM ravi k <kottapar(a)gmail.com> wrote:
Good people of the community,
Hi,
Hope you are all doing well. We are exploring the network filters in
oVirt
to check if we can implement a zero-trust model at the network level. The
intention is to have a filter which takes two parameters, IP and PORT.
After that there will be a 'deny all' rule. We realized that none of the
default network filters offer such a functionality and the only option is
to write a custom filter
Why don't we have such a filter in libvirt and thereby in oVirt? Someone
would've already thought about such a use case. So I was thinking
maybe
network filters aren't meant to be used for implementing such
functionalities like zero-trust?
You can definitely implement this filter on your own and if you feel like
it is a good solution send a patch to libvirt. oVirt really depends on what
is configured in libvirt, so if you define you filter
you can use it from the engine under some conditions.
1) You need to make sure that all hosts have this filter.
2) You need to define this filter in engine DB otherwise you would need
some kind of hook to apply it.
Also what are some practical use cases of the default filters that are
provided? I was able to understand and use the clean-traffic and
clean-traffic-gateway.
You can read what the predefined filters can offer in
https://libvirt.org/formatnwfilter.html#nwfexamples
Regards,
ravi
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Regards,
Ales
--
Ales Musil
Senior Software Engineer - RHV Network
Red Hat EMEA <https://www.redhat.com>
amusil(a)redhat.com IM: amusil
<https://red.ht/sig>
9:23 a.m.
New subject: Network filters in oVirt : zero-trust, IP and port filtering
you can use it from the engine under some conditions.
1) You need to make sure that all hosts have this filter.
2) You need to define this filter in engine DB otherwise you would need
some kind of hook to apply it.
Thanks a lot for that. If there's any doc that hints on how to define the filter in
the engine DB, can you please point me there? Right now I'm creating a filter to test
for this functionality. Once it's working I'll then try defining it in the DB.
Also if it's working as expected we'll submit it to libvirt as well.
Regards,
ravi
9:59 a.m.
New subject: Network filters in oVirt : zero-trust, IP and port filtering
On Wed, Feb 9, 2022 at 7:25 AM ravi k <kottapar(a)gmail.com> wrote:
> you can use it from the engine under some conditions.
> 1) You need to make sure that all hosts have this filter.
> 2) You need to define this filter in engine DB otherwise you would need
> some kind of hook to apply it.
Thanks a lot for that. If there's any doc that hints on how to define the
filter in the engine DB, can you please point me there?
This query should do the trick:
INSERT INTO network_filter VALUES (uuid_generate_v1(),
'clean-traffic-gateway' , '4.6');
Instead of 'clean-traffic-gateway' insert the name of your filter.
The third parameter is cluster version which you can find in your cluster
definition,
if you are past 4.4.6 it should be 4.6.
Once this is done you should see the filter available in the list on vNIC
profiles.
Right now I'm creating a filter to test for this functionality.
Once it's
working I'll then try defining it in the DB.
Also if it's working as expected we'll submit it to libvirt as well.
If the filter gets accepted to libvirt, feel free to open PR on
ovirt-engine to include this filter for other oVirt users.
Regards,
ravi
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Regards,
Ales
--
Ales Musil
Senior Software Engineer - RHV Network
Red Hat EMEA <https://www.redhat.com>
amusil(a)redhat.com IM: amusil
<https://red.ht/sig>
12:13 p.m.
New subject: Network filters in oVirt : zero-trust, IP and port filtering
I've created the below filter. The intention is that it will allow incoming traffic
only from SRCIP parameter and within the port range.
However I'm still able to access the VM from other IPs as well. We are running oVirt
4.3 and the networks are vlan tagged.
virsh -r nwfilter-dumpxml clean-ip-port-filter
<filter name='clean-ip-port-filter' chain='root'>
<uuid>f9d2ff6b-db31-41a0-8f1b-97dc0166c10a</uuid>
<rule action='accept' direction='in' priority='500'>
<tcp srcipaddr='$SRCIP' dstportstart='$PORTSTART'
dstportend='$PORTEND'/>
</rule>
</filter>
Could it be because of the statement "VLAN (802.1Q) packets, if sent by a virtual
machine, cannot be filtered with rules for protocol IDs arp, rarp, ipv4 and ipv6 but only
with protocol IDs mac and vlan." in https://libvirt.org/formatnwfilter.html?
If netfilters do not work with vlan packets, is there any other way I can implement such
filtering?
Regards,
Ravi
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