[jira] [Resolved] (CLOUDSTACK-8559) Source address spoofing prevention in Basic Networking only done for DNS

["Wido den Hollander (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CLOUDSTACK-8559?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Wido den Hollander resolved CLOUDSTACK-8559.
--------------------------------------------
    Resolution: Fixed

This is in master and also backported to 4.5.2

I confirmed that it works fine. Running it in production.

> Source address spoofing prevention in Basic Networking only done for DNS
> ------------------------------------------------------------------------
>
>                 Key: CLOUDSTACK-8559
>                 URL: https://issues.apache.org/jira/browse/CLOUDSTACK-8559
>             Project: CloudStack
>          Issue Type: Bug
>      Security Level: Public(Anyone can view this level - this is the default.) 
>          Components: KVM
>            Reporter: Wido den Hollander
>            Assignee: Wido den Hollander
>             Fix For: 4.6.0, 4.5.2
>
>
> Looking at the security group rules being programmed for Instances it seems that we only drop spoofed traffic when it's for DNS:
> if vm_ip is not None:
>   execute("iptables -A " + vmchain_default + " -m physdev --physdev-is-bridged --physdev-in " + vif + " -m set --set " + vmipsetName + " src -p udp --dport 53  -j RETURN ")
>   execute("iptables -A " + vmchain_default + " -m physdev --physdev-is-bridged --physdev-in " + vif + " -m set --set " + vmipsetName + " src -j " + vmchain_egress)
> I think that we can drop ALL packets which do not match any of the IPs in the list. I don't see a valid reason why we only do this for DNS/UDP 53.



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