[OpenAFS] containers / AFS / Ubuntu - stopped working

Sat, 28 Nov 2015 16:58:36 -0500

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On 11/28/2015 4:19 PM, Neil Davies wrote:
> I can confirm that this sis the problem
>=20
> There was a change in docker 1.2.1 (a CVE related fix) that now forces =
/proc/fs to be mounted read-only
>=20
> use of the --privileged  argument to docker run does allow openafs to r=
un ok, but only at the cost of loosing
> all of the container isolation!
>=20
> I spent some time trying to work out how to _just_ permit read-write ac=
cess to the appropriate portion of=20
> the /proc/fs filestore, but not cracked it.=20
>=20
> It is potentially possible to mount the host's /proc/fs/openafs under a=
 different name (with read-write access)
> within the container - but that would imply a change to the openafs bui=
lding process....
>=20
> Obviously I could modify the docker sources, submit a patch etc..=20
>=20
> Any suggestions? I'm just wondering if there is any other bits of funct=
ionality that the docker folks might have=20
> broken this way - looking to see if there we, as a community, are not a=
lone here.
>=20
> Neil

Containers were not designed with the expectation that they would be
accessing resources from a network file system.

The solution that I am pursuing with Microsoft is to permit the
container to be created with a network identity associated to it.
For Linux what we would want is the ability to start a container and all
of its processes as part of a PAG where a process running in the host
context (not the container's) would obtain the tokens for the container.

I believe it is inappropriate for the container processes to have access
to a keytab or a username/password combination.

I agree with Microsoft that a container should not be able to modify
kernel driver state such as by storing a network credential for a remote
user.  There is no requirement that kernel drivers provide security
boundaries between container name spaces.

There are some use cases such as running an sshd that provides shells
with access to network resources as the remote user identity which are
not appropriate for Containers.  Virtual machines should be used in such
instances to obtain the proper process isolation.

Jeffrey Altman

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email;internet:jaltman@auristor.com
title:Founder and CEO
tel;work:+1-212-769-9018
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