Re: dhclient: avoiding hostname disclosure via DHCP request

[Geert Stappers <stappers stappers nl>]

Op 2013-12-23 om 20:33 schreef Robert Horovitz:
> > Mark in /etc/dhcp/dhclient.conf 'send host-name' as comment.
>
> Since the resulting file is created by merging /etc/dhcp/dhclient.conf
> into /var/lib/NetworkManager/dhclient-em1.conf that does not do the trick.
>
> The final file looks like:
>
> -----
> # Created by NetworkManager
> # Merged from /etc/dhcp/dhclient.conf
>
> # send host-name "foobar";
> [...]
> send host-name "foobar"; # added by NetworkManager
> [...]
> -----

That does surprise me. But, hey, I'm also new to the inner working of NM.


The (graphical) user interface of Network Manager
has an option named 'DHCP client ID'

Providing there a string like 'anon' should hide "foobar".
That is the place where I would expect the program code that does add
'send host-name "foobar"; # added by NetworkManager' to /var/lib/NetworkManager/dhclient-em1.conf

When that place in the source code is found,
it is easy to remove it.  ( easier as adding code to the right place )


Groeten
Geert Stappers
-- 
Leven en laten leven