[Gluster-users] Volume hacked

Niels de Vos
Mon, 07 Aug 2017 12:04:55 -0000

On Sun, Aug 06, 2017 at 08:54:33PM +0100, lemonnierk at ulrar.net
wrote:
> Thinking about it, is it even normal they managed to delete the VM disks?
> Shoudn't they have gotten "file in use" errors ? Or does
libgfapi not
> lock the access files ?

It really depends on the application if locks are used. Most (Linux)
applications will use advisory locks. This means that locking is only
effective when all participating applications use and honour the locks.
If one application uses (advisory) locks, and an other application now,
well, then all bets are off.

It is also possible to delete files that are in active use. The contens
will still be served by the filesystem, but there is no accessible
filename anymore. If the VMs using those files are still running, there
might be a way to create a new filename for the data. If the VMs have
been stopped, and the file-descriptior has been closed, the data will be
gone :-/

Niels


>
>
> On Sun, Aug 06, 2017 at 03:57:06PM +0100, lemonnierk at ulrar.net wrote:
> > Hi,
> >
> > This morning one of our cluster was hacked, all the VM disks were
> > deleted and a file README.txt was left with inside just
> > "http://virtualisan.net/contactus.php :D"
> >
> > I don't speak the language but with google translete it looks like
it's
> > just a webdev company or something like that, a bit surprised ..
> > In any case, we'd really like to know how that happened.
> >
> > I realised NFS is accessible by anyone (sigh), is there a way to check
> > if that is what they used ? I tried reading the nfs.log but it's
not
> > really clear if someone used it or not. What do I need to look for in
> > there to see if someone mounted the volume ?
> > There are stuff in the log on one of the bricks (only one),
> > and as we aren't using NFS for that volume that in itself seems
> > suspicious.
> >
> > Thanks
>
>
>
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