[OpenAFS] MSI deployment doc available for Secure Endpoints plugin?

Jeffrey Altman jaltman@secure-endpoints.com
Thu, 02 Feb 2006 10:23:26 -0500


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Charles Duffy wrote:

> I wouldn't mind using KfW 2.6.5, but I've had a great deal of trouble
> getting tokens that our AFS servers accept from it -- it's necessary to
> force krb524 use (or else the AFS servers reject the tokens, resulting
> in even *less* access than system:anyuser), and I don't see a way to do
> that documented in the KfW 2.6.5 deployment guide or release notes.

Read the OpenAFS for Windows release notes.   There is a registry key
to force the use of krb524d in afscreds.exe.  If KFW is installed
afscreds.exe uses it to obtain tokens using Kerberos 5.   From the
release notes:

3.1.2. Using the krb524 service

Some organizations which have AFS cell names and Kerberos realm names
which differ by more then just lower and upper case rely on a
modification to krb524d which maps a Kerberos 5 ticket from realm FOO to
a Kerberos 4 ticket in realm BAR.  This allows user@FOO to appear to be
user@bar for the purposes of accessing the AFS cell.  As of OpenAFS
1.2.8, support was added to allow the immediate use of Kerberos 5
tickets as AFS (2b) tokens. This is the first building block necessary
to break away from the limitations of Kerberos 4 with AFS.  By using
Kerberos 5 directly we avoid the security holes inherent in Kerberos 4
cross-realm.  We also gain access to cryptographically stronger
algorithms for authentication and encryption.

Another reason for using Kerberos 5 directly is because the krb524
service runs on a port (4444) which has become increasingly blocked by
ISPs.  The port was used to spread a worm which attacked Microsoft
Windows in the summer of 2003.  When the port is blocked users find that
they are unable to authenticate.

Replacing the Kerberos 4 ticket with a Kerberos 5 ticket is a win in all
situations except when the cell name does not match the realm name and
the principal names placed into the ACL’s are not the principal names
from the Kerberos 5 ticket.  To support this transition, OpenAFS for
Windows 1.4 adds a new registry value, Use524, to force the use of
krb524d.  However, the availability of this option should only be used
by individuals until such time as their organizations can provide a more
permanent solution.


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