[OpenAFS] Poll: how many organizations are performing principal name mappings via krb524d, gssklogd, etc?

[Jeffrey Altman]

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Folks, I would like to try to get some idea of just how many
organizations are using a translation service to map a Kerberos 5
ticket from one realm to a Kerberos 4 ticket in another realm
for the purposes of providing access to a local cell.

For example, yesterday it we determined that Kerberos 5 principals
within the realm NCSA.EDU are mapped via krb524d to Kerberos 4
principals within the realm NCSA.UIUC.EDU in order for AFS to
recognize the local user since the cell name is ncsa.uiuc.edu.

   u@NCSA.EDU (k5) -> u@NCSA.UIUC.EDU (k4) -> u@ncsa.uiuc.edu (afs)

The core problem with this approach is that it makes access to
the AFS cell by end users dependent upon the translation service.
The direction that OpenAFS is taking is to move to a pure Kerberos
5 environment.  We want to use Kerberos 5 tickets as AFS (2b) tokens
for many reasons:

   * Kerberos 4 is cryptographically weak
   * Kerberos 4 cross-realm is a security hole
   * Single DES keys can no longer be trusted to protect data
   * The port used by the krb524 service is frequently blocked by
     firewalls and ISPs because it was once used by a worm that
     attacks Microsoft Windows

However, without the translation service, AFS will see the user as:

   u@NCSA.EDU (k5) -> u@ncsa.edu (afs)

and this name will not appear as part of any of the ACLs for the
AFS volumes.  As a result, end users cannot gain access to their
data when 2b tokens are used.

I want to get an idea of how wide spread this problem is.  OpenAFS
1.4 is going to support Kerberos 5 crypto based encryption for
protecting AFS data exchanges.  Once this is released the
justification for maintaining support for cryptographically
insecure operations is going to rapidly disappear and organizations
are going to be faced with a very hard choice.

In the meantime, organizations which are dependent on these
translation services are going to have to document this dependency
very clearly as part of their local instructions for configuring
OpenAFS clients.  Otherwise, the number of support calls is
going to rapidly increase.

If your organization is dependent on a translation service, please
drop me an e-mail so that I can keep a private list.  Please indicate
as part of your e-mail whether or not you would be willing to have
this information made part of a public list in the Wiki.

Thanks.

Jeffrey Altman



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