On Sun, May 12, 2013 at 02:42:36PM -0400, Mike Kelly wrote: > On Thu, May 9, 2013 at 12:21 PM, Richard W.M. Jones <rjones@xxxxxxxxxx> wrote: > > On Thu, May 09, 2013 at 11:23:55AM -0400, Mike Kelly wrote: > >> On Wed, May 8, 2013 at 6:53 AM, Richard W.M. Jones <rjones@xxxxxxxxxx> wrote: > >> > One worry I have is whether quoting is required for the server > >> > name(s), export name, username and secret. > >> > >> Well. I think the main things we had to quote were ':' and ';', but > >> none of those are valid in a hostname. Username also probably doesn't > >> contain anything special, and secret is a base64-encoded string. I > >> confirmed that even with the string ending in '==', it was parsed just > >> fine by qemu, at least in my limited manual testing. > >> > >> If you can suggest a way to be more robust this, though, then I can > >> try to work that into a future patch series. > > > > The quoting problem happens when someone writes a program which takes > > (eg) a hostname string from the user and passes it unmodified to the > > guestfs API. It's an issue if this string can cause unexpected [even > > malicious/exploitable] things to happen when passed unquoted on the > > qemu command line. > > Well, I'm not sure if this way of setting things up is still > encouraged, but at least this documentation suggests basically using > the fact that libvirt won't quote the image name as a "feature": > > http://ceph.com/w/index.php?title=QEMU-RBD#Caching > > <disk type='network' device='disk'> > <source protocol='rbd' > name='poolname/imagename:rbd_cache=1:rbd_cache_size=67108864:rbd_cache_max_dirty=0'/> Hmmm ... This is a bug in libvirt, but also a missing feature of libvirt since it cannot express these other configuration fields. > <driver name='qemu' type='rbd'/> > <target dev='vda' bus='virtio'/> > </disk> > > The more official documentation for configuring caching doesn't seem > to make any specific mention of this: > > http://ceph.com/docs/master/rbd/qemu-rbd/#qemu-cache-options > http://ceph.com/docs/master/rbd/libvirt/ > http://ceph.com/docs/master/rbd/rbd-config-ref/ By the way, I fixed some qemu-img command line quoting issues yesterday (but not in ceph): https://github.com/libguestfs/libguestfs/commit/914d3e68ec272436f91080f47ddfe4db8f1d8751 Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones Read my programming blog: http://rwmj.wordpress.com Fedora now supports 80 OCaml packages (the OPEN alternative to F#) -- libvir-list mailing list libvir-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/libvir-list