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Change abandoned by Sean Dague (sean at dague.net) on branch: master
Review: https://review.openstack.org/119589
Reason: This review is > 4 weeks without comment, and failed Jenkins the last time it was checked. We are abandoning this for now. Feel free to reactivate the review by pressing the restore button and leaving a 'recheck' comment to get fresh test results.

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https://bugs.launchpad.net/bugs/1316271

Title:
  Network Security: VM hosts can SSH to compute node

Status in OpenStack Compute (Nova):
  In Progress
Status in OpenStack Security Advisories:
  Won't Fix
Status in OpenStack Security Notes:
  Fix Released

Bug description:
  Hi guys,

      We're still using nova-network and we'll be using it for a while
  and we noticed that the VM guests can contact the compute nodes on all
  ports ... The one we're the most preoccupied with is SSH.   We've
  written the following patch in order to isolate the VM guests from the
  VM hosts.

  --- linux_net.py.orig   2014-05-05 17:25:10.171746968 +0000
  +++ linux_net.py        2014-05-05 18:42:54.569209220 +0000
  @@ -805,6 +805,24 @@

  
   @utils.synchronized('lock_gateway', external=True)
  +def isolate_compute_from_guest(network_ref):
  +    if not network_ref:
  +        return
  +
  +    iptables_manager.ipv4['filter'].add_rule('INPUT',
  +                                             '-p tcp -d %s --dport 8775 '
  +                                             '-j ACCEPT' % network_ref['dhcp_server'])
  +    iptables_manager.ipv4['filter'].add_rule('FORWARD',
  +                                             '-p tcp -d %s --dport 8775 '
  +                                             '-j ACCEPT' % network_ref['dhcp_server'])
  +    iptables_manager.ipv4['filter'].add_rule('INPUT',
  +                                             '-d %s '
  +                                             '-j DROP' % network_ref['dhcp_server'])
  +    iptables_manager.ipv4['filter'].add_rule('FORWARD',
  +                                             '-d %s '
  +                                             '-j DROP' % network_ref['dhcp_server'])
  +    iptables_manager.apply()
  +
   def initialize_gateway_device(dev, network_ref):
       if not network_ref:
           return
  @@ -1046,6 +1064,7 @@
               try:
                   _execute('kill', '-HUP', pid, run_as_root=True)
                   _add_dnsmasq_accept_rules(dev)
  +                isolate_compute_from_guest(network_ref)
                   return
               except Exception as exc:  # pylint: disable=W0703
                   LOG.error(_('Hupping dnsmasq threw %s'), exc)
  @@ -1098,6 +1117,7 @@

       _add_dnsmasq_accept_rules(dev)

  +    isolate_compute_from_guest(network_ref)

   @utils.synchronized('radvd_start')
   def update_ra(context, dev, network_ref):

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