This helps hiding VM IP for anonymous VMs (Whonix) even when some
application leak it. VM will know only some fake IP, which should be set
to something as common as possible.
The feature is mostly implemented at (Proxy)VM side using NAT in
separate network namespace. Core here is only passing arguments to it.
It is designed the way that multiple VMs can use the same IP and still
do not interfere with each other. Even more: it is possible to address
each of them (using their "native" IP), even when multiple of them share
the same "fake" IP.
Original approach (marmarek/old-qubes-core-admin#2) used network script
arguments by appending them to script name, but libxl in Xen >= 4.6
fixed that side effect and it isn't possible anymore. So use QubesDB
instead.
From user POV, this adds 3 "features":
- net/fake-ip - IP address visible in the VM
- net/fake-gateway - default gateway in the VM
- net/fake-netmask - network mask
The feature is enabled if net/fake-ip is set (to some IP address) and is
different than VM native IP. All of those "features" can be set on
template, to affect all of VMs.
Firewall rules etc in (Proxy)VM should still be applied to VM "native"
IP.
FixesQubesOS/qubes-issues#1143
This commit eliminates import statements happening in the middle of the
file (between two classes definition). The cycles are still there. The
only magic module is qubes itself.
- introduce 'firewall-changed' event
- add reload_firewall_for_vm stub function
Should that function be private, called only from appropriate event
handlers?
QubesOS/qubes-issues#1815
It is much less error-prone way. Previous approach didn't worked because
VMs weren't added here at 'domain-init'/'domain-loaded' event. And even
after adding such handlers it wasn't working because of
QubesOS/qubes-issues#1816.
It may be a little slower, but since it isn't used so often
(starting/stopping VM and reloading firewall), shouldn't be a problem.
The following list is bollocks. There were many, many more.
Conflicts:
core-modules/003QubesTemplateVm.py
core-modules/005QubesNetVm.py
core/qubes.py
core/storage/__init__.py
core/storage/xen.py
doc/qvm-tools/qvm-pci.rst
doc/qvm-tools/qvm-prefs.rst
qubes/tools/qmemmand.py
qvm-tools/qvm-create
qvm-tools/qvm-prefs
qvm-tools/qvm-start
tests/__init__.py
vm-config/xen-vm-template-hvm.xml
This commit took 2 days (26-27.01.2016) and put our friendship to test.
--Wojtek and Marek
