bhyve client: who is hosting me?

[Darius Mihai]

On Fri, May 25, 2018 at 9:08 AM Daniel Braniss <danny at cs.huji.ac.il> wrote:

> Hi,
> I’m trying out bhyve with different setups, but mailny FreeBSD (11.2 and
12), and
> was wondering if there is any way for the client to know who is hosting
it?

> thanks,
>          danny

Hi,

What do you mean 'knowing who is hosting it?'
If you mean obtaining information such as IP address or hostname of the
host from inside the guest operating system, it should not be possible and
is likely a security flaw if it were allowed by default.

Operating systems should ideally be unable to determine even that the
system is a virtual machine instead of a hardware based host; however since
bhyve uses VirtIO devices and other virtualization mechanisms due to
performance issues you are indeed able to determine that the OS is running
in a virtual machine. More specific information should be impossible to
obtain if not injected by the host (e.g., running a web server on the host
with some information, adding a virtual block device with a configuration
file, and so on).

Darius

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