[OpenAFS] ISP blocking Krb4 traffic?
Jeffrey Altman
jaltman@columbia.edu
Thu, 15 Apr 2004 12:34:15 -0400
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Ken Hornstein wrote:
>The obvious workaround here is to simply have an aklog which doesn't
>perform the 524 step (if you have a modern openafs, it isn't necessary).
>I haven't yet modified our aklog to do the necessary magic, but it's
>not hard. I believe that Jeff Altman said that KfW is going to go
>that route as well. When I get some free cycles, I'll add that
>functionality to aklog.
>
There were some missing pieces on the server side.
The openafs servers only supported DES-CBC-CRC
based tickets while Windows 2003 Active Directory
only issues DES-CBC-MD5 tickets. Therefore, in
order to use Windows 2003 as the KDC the server
must be upgraded.
The second item which needed to be accomplished was
support for the large Kerberos 5 tickets which can
be produced on Windows (up to 12,000 bytes). Patches
for both MD5 and large tokens have been committed to
the CVS HEAD.
KFW 2.6.1 which was announced yesterday no longer
used krb524 unless the ktc_SetToken() operation
rejects the pure K5 based token due to size.
The daily OpenAFS Windows builds do not use krb524
at all.
Jeffrey Altman
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<font face="Bitstream Cyberbit">Ken Hornstein wrote:<br>
</font>
<blockquote
cite="mid200404151617.i3FGHWVg009321@ginger.cmf.nrl.navy.mil"
type="cite">
<pre wrap=""><font face="Bitstream Cyberbit">The obvious workaround here is to simply have an aklog which doesn't
perform the 524 step (if you have a modern openafs, it isn't necessary).
I haven't yet modified our aklog to do the necessary magic, but it's
not hard. I believe that Jeff Altman said that KfW is going to go
that route as well. When I get some free cycles, I'll add that
functionality to aklog.
</font></pre>
</blockquote>
There were some missing pieces on the server side.<br>
The openafs servers only supported DES-CBC-CRC <br>
based tickets while Windows 2003 Active Directory<br>
only issues DES-CBC-MD5 tickets. Therefore, in <br>
order to use Windows 2003 as the KDC the server<br>
must be upgraded.<br>
<br>
The second item which needed to be accomplished was<br>
support for the large Kerberos 5 tickets which can<br>
be produced on Windows (up to 12,000 bytes). Patches<br>
for both MD5 and large tokens have been committed to<br>
the CVS HEAD.<br>
<br>
KFW 2.6.1 which was announced yesterday no longer <br>
used krb524 unless the ktc_SetToken() operation <br>
rejects the pure K5 based token due to size. <br>
The daily OpenAFS Windows builds do not use krb524<br>
at all.<br>
<br>
Jeffrey Altman<br>
<br>
<br>
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