[OpenAFS] AFS in the age of the wild west internet

[Jeffrey Altman]

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On 5/3/2016 11:02 AM, Steve Gaarder wrote:
> Yes, of course we do that.  My question is whether there is also a way
> to say that some volumes cannot be accessed from outside our network
> regardless of credentials.  Would it work to put all those volumes on a=

> server with a firewall that blocks access?
>=20
> Steve Gaarder
> System Administrator, Dept of Mathematics
> Cornell University, Ithaca, NY, USA
> gaarder@math.cornell.edu
>=20
> On Tue, 3 May 2016, Brandon Allbery wrote:
>=20
>> fs sa /path/to/whatever system:anyuser none
>>

Steve,

You can put some of the file servers behind a VPN/firewall.  This is the
approach used by Stanford for their "Secure AFS" service.

  https://uit.stanford.edu/service/secureafs

Stanford has a risk classification policy for data

  https://uit.stanford.edu/guide/riskclassifications

Normal AFS is acceptable for low and moderate risk and the Secure AFS
space is also acceptable for high risk data.

The weakness with this approach is that there is nothing that prevents a
cell administrator from accidentally moving a volume within the cell
from a secure server to an insecure server.  That and the fact that the
AFS cell authentication and wire privacy is still using the fcrypt
algorithm which is notoriously weak.

AuriStorFS addresses these issues with:

 1. Security Policies (Authn, Integ, Privacy) requirements on volumes
    and file servers.  Only a file server with a security policy equal
    to or stricter than the volume policy can host the volume.  These
    policies are used to enforce the proper security posture for each
    connection that a client uses when contacting a file server.

 2. Labels.  Volumes and File Servers can be assigned arbitrary labels.
    A volume can only reside on a file server that has a superset of
    the labels assigned to the volume.

 3. The yfs-rxgk security class permits the use of the
    AES256-CTS-HMAC-SHA1-96 algorithm for encryption and provides
    perfect forward secrecy.  As soon as the IETF finishes
    standardization the AES256-CTS-HMAC-SHA384-192 algorithm will
    be supported.

In addition, AuriStorFS supports multi-factor access control entries so
it is possible to grant different permissions to

   anonymous
   user
   anonymous @ machine
   machine
   user @ machine

where "user" and "machine" are Kerberos identities.

It is worth noting that AuriStorFS also ensures that all server to
server communication is protected.  When AuriStorFS volservers are in
use volume operations can be performed on networks that are not visible
to the machine the "vos" command is executed on.

Jeffrey Altman
AuriStor, Inc.


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fn:Jeffrey Altman
n:Altman;Jeffrey
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adr:Suite 6B;;255 West 94Th Street;New York;New York;10025-6985;United St=
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email;internet:jaltman@auristor.com
title:Founder and CEO
tel;work:+1-212-769-9018
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