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A Mirage firewall VM for QubesOS
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README.md

qubes-mirage-firewall

A unikernel that can run as a QubesOS ProxyVM, replacing sys-firewall. It uses the mirage-qubes library to implement the Qubes protocols.

Note: This firewall ignores the rules set in the Qubes GUI. See rules.ml for the actual policy.

See A Unikernel Firewall for QubesOS for more details.

Build

Clone this Git repository and run the build-with-docker.sh script:

sudo yum install docker
sudo systemctl start docker
git clone https://github.com/talex5/qubes-mirage-firewall.git
cd qubes-mirage-firewall
sudo ./build-with-docker.sh

This took about 10 minutes on my laptop (it will be much quicker if you run it again).

You can also build without Docker, as for any normal Mirage unikernel; see the Mirage installation instructions for details.

Deploy

If you want to deploy manually, unpack mirage-firewall.tar.bz2 in dom0, inside /var/lib/qubes/vm-kernels/. e.g. (if dev is the AppVM where you built it):

[tal@dom0 ~]$ cd /var/lib/qubes/vm-kernels/
[tal@dom0 vm-kernels]$ qvm-run -p dev 'cat qubes-mirage-firewall/mirage-firewall.tar.bz2' | tar xjf -

The tarball contains vmlinuz, which is the unikernel itself, plus a couple of dummy files that Qubes requires. To configure your new firewall using the Qubes Manager GUI:

  • Create a new ProxyVM named mirage-firewall to run the unikernel.
  • You can use any template, and make it standalone or not. It doesn’t matter, since we don’t use the hard disk.
  • Set the type to ProxyVM.
  • Select sys-net for networking (not sys-firewall).
  • Click OK to create the VM.
  • Go to the VM settings, and look in the Advanced tab:
    • Set the kernel to mirage-firewall.
    • Turn off memory balancing and set the memory to 32 MB or so (you might have to fight a bit with the Qubes GUI to get it this low).
    • Set VCPUs (number of virtual CPUs) to 1.

You can run mirage-firewall alongside your existing sys-firewall and you can choose which AppVMs use which firewall using the GUI. To configure an AppVM to use it, go to the app VM's settings in the GUI and change its NetVM from default (sys-firewall) to mirage-firewall. Alternatively, you can configure mirage-firewall to be your default firewall VM.

For development, use the test-mirage scripts to deploy the unikernel (mir-qubes-firewall.xen) from your development AppVM. e.g.

$ test-mirage qubes_firewall.xen mirage-firewall
Waiting for 'Ready'... OK
Uploading 'qubes_firewall.xen' (5901080 bytes) to "mirage-firewall"
Waiting for 'Booting'... OK
--> Loading the VM (type = ProxyVM)...
--> Starting Qubes DB...
--> Setting Qubes DB info for the VM...
--> Updating firewall rules...
--> Starting the VM...
--> Starting the qrexec daemon...
Waiting for VM's qrexec agent.connected
--> Starting Qubes GUId...
Connecting to VM's GUI agent: .connected
--> Sending monitor layout...
--> Waiting for qubes-session...
Connecting to mirage-firewall console...
MirageOS booting...
Initialising timer interface
Initialising console ... done.
gnttab_stubs.c: initialised mini-os gntmap
2017-03-18 11:32:37 -00:00: INF [qubes.rexec] waiting for client...
2017-03-18 11:32:37 -00:00: INF [qubes.gui] waiting for client...
2017-03-18 11:32:37 -00:00: INF [qubes.db] connecting to server...
2017-03-18 11:32:37 -00:00: INF [qubes.db] connected
2017-03-18 11:32:37 -00:00: INF [qubes.rexec] client connected, using protocol version 2
2017-03-18 11:32:37 -00:00: INF [qubes.db] got update: "/qubes-keyboard" = "xkb_keymap {\n\txkb_keycodes  { include \"evdev+aliases(qwerty)\"\t};\n\txkb_types     { include \"complete\"\t};\n\txkb_compat    { include \"complete\"\t};\n\txkb_symbols   { include \"pc+gb+inet(evdev)\"\t};\n\txkb_geometry  { include \"pc(pc105)\"\t};\n};"
2017-03-18 11:32:37 -00:00: INF [qubes.gui] client connected (screen size: 6720x2160)
2017-03-18 11:32:37 -00:00: INF [unikernel] Qubes agents connected in 0.095 s (CPU time used since boot: 0.008 s)
2017-03-18 11:32:37 -00:00: INF [net-xen:frontend] connect 0
2017-03-18 11:32:37 -00:00: INF [memory_pressure] Writing meminfo: free 6584 / 17504 kB (37.61 %)
Note: cannot write Xen 'control' directory
2017-03-18 11:32:37 -00:00: INF [net-xen:frontend] create: id=0 domid=1
2017-03-18 11:32:37 -00:00: INF [net-xen:frontend]  sg:true gso_tcpv4:true rx_copy:true rx_flip:false smart_poll:false
2017-03-18 11:32:37 -00:00: INF [net-xen:frontend] MAC: 00:16:3e:5e:6c:11
2017-03-18 11:32:37 -00:00: WRN [command] << Unknown command "QUBESRPC qubes.SetMonitorLayout dom0"
2017-03-18 11:32:38 -00:00: INF [ethif] Connected Ethernet interface 00:16:3e:5e:6c:11
2017-03-18 11:32:38 -00:00: INF [arpv4] Connected arpv4 device on 00:16:3e:5e:6c:11
2017-03-18 11:32:38 -00:00: INF [dao] Watching backend/vif
2017-03-18 11:32:38 -00:00: INF [qubes.db] got update: "/qubes-netvm-domid" = "1"

LICENSE

Copyright (c) 2017, Thomas Leonard All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

  1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.

  2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. gg

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