This allows a jail to have a VPN config associated and as a result we start
a new net namespace, completely isolating the jails networking.
We then start an openVPN client to route between the main network and the
jails' network.
The main limitation here is that we don't setup DNS, which basically means
that the VPN will route DNS calls to the other side, but since we don't
remount resolv.conf this depends on the vpn provider actually mapping the
nameserver we use. For people that use a nameserver like 192.168.100.1,
this most of the time works just fine.
Improvement is possible.
When starting a new application for the first time you can
start them with these two feature.
Autodelete:
this waits until the iso-pipe file is removed by the jailer,
which it does when all processes stopped,
and then proceeds to remove all files for the jail.
Secure:
Puts all known rights in the 'denied' list, making the jail
quite secure. Not a VM or a docker, but close.
We re-route the dbus socket to a different location and then start
the dbus proxy in order to provide a filtered view of the world for our
jailed application.
DBus is a fantastic and a horrible system at the same time. It provides
only basic concepts and features which others can build on top of. Which
is great as many have done that building on top of it.
Unfortunately many apps have completely missed the idea of security and
hierarchy so its a mess now and you can't really open up most to apps...
Favourite stupid design, the org.freedesktop.Notifications has under
there the 'klipper' app. With an endpoint to destroy all its historical
data. Making 'just open the notifications, what could go wrong' end with
pain.
This moves the primary key for a 'jail' to no longer be the executable
path, but instead a name.
In many cases that string will be based on the executable path, for
instance it will take the filename if the exe lives in /bin or /usr/bin
so in that respect nothing will change.
What this does allow is that you can have two different profiles that
both map to the same executabe. Allowing for instance having two
completely isolated instances running of telegram or of firefox.
The defaults are not 'secure', as they would be annoying to the max.
This is an isolation runner, removing a lot of attack vectors, for sure
but the name would give the wrong impression with defaults like we have
now.
This introduces the command execute-apprules which behaves like
an 'include' as it recurses into the app specific file.
If there is no app specific one, it will load the default.rules
Notable too is that in an app specific rules file the usage of
execute-apprules will always go to default.rules, to avoid
copy / paste of rules.
tomFlowee