From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Windsor Subject: Re: [RFC][PATCH 00/01]qemu VM entrypoints Date: Sat, 21 Jul 2007 02:53:03 -0400 Message-ID: References: <46A1A5E9.7000807@qumranet.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Cc: kvm-devel , David Windsor , Joshua Brindle , selinux To: Avi Kivity , Anthony Liguori Return-path: In-Reply-To: <46A1A5E9.7000807-atKUWr5tajBWk0Htik3J/w@public.gmane.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: kvm-devel-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org Errors-To: kvm-devel-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Id: kvm.vger.kernel.org On 7/21/07 2:21 AM, "Avi Kivity" wrote: > Anthony Liguori wrote: >> James Morris wrote: >> >>> On Fri, 20 Jul 2007, Daniel P. Berrange wrote: >>> >>> >>> >>>> It could be - if your put the policy at the control API layer instead of >>>> in QEMU itself. >>>> >>>> >>> Then you can bypass MAC security by invoking qemu directly. >>> >>> >> >> You can bypass MAC security by writing your own binary that uses the KVM >> kernel interfaces. >> >> > > I guess modifying qemu makes sense if the modification gives you *more* > permissions. > > i.e. you start out just with the ability to access the disk image, and > then you transition to a new domain that allows you to access some network. > > > Is that what is intended here? The intent here is to provide some mechanism for a policy-driven transition to occur when loading a virtual disk. So, an administrator would write policy for say, a topsecret_vm_t domain, in which the top secret VM can run. All access requests from this VM would have a source type of topsecret_vm_t on the host machine. The virtual disk, labeled perhaps as topsecret_disk_t, would need to be authorized in policy to be an entrypoint into the topsecret_vm_t domain. This patch proposes a mechanism that allows us to provide policy driven controls both over which files can be used as a disk image, and to which domain a qemu process will transition after loading the disk image. Originally, I thought qemu was the proper place for this type of an enforcement hook, but libvirt may be more appropriate because qemu could be launched with a different security context if loading a virtual disk, rather than having qemu set up the security context of the VM. Thoughts? ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2005. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/