bhyve client: who is hosting me?

[Daniel Braniss]

> On 25 May 2018, at 10:02, Darius Mihai <dariusmihaim at gmail.com> wrote:
> 
> 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.

ok, so not by default, but is there a way?
i don’t know why this is a security flaw - maybe security by obscurity? in any case
since the client knows that it’s running as a bhive client, (hw.hv_vendor), again, if
this is also a security flaw, it could be set/reset when the client is being configured?

thanks,
	danny
 
> 
> 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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