Cool. It looks like that works. Perhaps it would be good for oVirt to have a few text fields in the nic properties to enter IP addresses into which can match the rules being used. For example, when enabling the clean-traffic filter it appears the VM can only have 1 IP address, even if another IP is added legitimately, it still only works with the original IP address.

 

Something like this: http://i.imgur.com/9BUZRCN.jpg

 

So essentially, traffic would be blocked on that VM for any other IP space other than the IP’s entered into the text fields, which then edit/work with the netfilter rules. The idea would be to click “click to add more” would add another text field.

 

 

 

From: Edward Haas
Sent: Thursday, August 4, 2016 3:47 AM
To: Subhendu Ghosh
Cc: Bill Bill; users
Subject: Re: [ovirt-users] IP Address Stealing

 

On Thu, Aug 4, 2016 at 6:27 AM, Subhendu Ghosh <sghosh@redhat.com> wrote:

Not built into ovirt AFAIK,  but an ebtables rule can allow you to filter out mac+ip combinations 

Look at the anti-spoofing rules on ebtables.netfilter.org

It doesn't prevent the user adding it in the vm, but the infrastructure blocks it's usage.

---

From: Bill Bill <jax2568@outlook.com>
Sent: Aug 3, 2016 22:40
To: users@ovirt.org
Subject: [ovirt-users] IP Address Stealing

Hello,

 

It is possible to prevent a VM from adding an IP? For example, if we provision a VM with one IP, if the user has root access they can simply add random IP’s from within the same range as sub interfaces: eth0:0 eth0:1 eth0:2 so on and so forth.

 

Subnetting is not ideal in this situation because it’s a huge waste of IP space.

In oVirt 4.0, you can choose a vnic libvirt filter from a list (at the vnic profile settings).

You can check the clean-traffic filter which uses multiple other more specific filters.
Ref: https://libvirt.org/formatnwfilter.html

Thanks,

Edy.

 

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