[OpenAFS] rxkad error=19270408
Jeffrey Altman
jaltman@secure-endpoints.com
Tue, 21 Apr 2009 23:59:39 -0400
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A Windows XP system reporting a downgrade attack is unrelated.
It means that either you have created a "cifs/afs@DOMAIN" SPN
or you are experiencing a bug in XP.
All rxkad errors are reported as "No Kerberos Key" to Windows
applications.
On Windows, what is the process that is using 100% CPU and
what version of OAFW are you running?
Of course, /etc/krb5.keytab is not used for OpenAFS on Linux.
Does "bos listkeys -localauth" report the correct kvno?
Did you flush all of the credential caches and "unlog" to get
rid of the the inconsistent keys?
Ted Creedon wrote:
> I've installed 1.4.10 on a linux afs server geronimo and linux client ookpik
>
> the client works on geronimo but uses 96% of 8 cpu's on ookpik which
> also has a kernel message rxaderrror
>
> An untouched previously working XP client also hangs at 100% CPU but
> eventially carps "attempt to compromise security" when the afs shares
> are selected.
>
> Some key ot cc file may have been munged on geronimo but /tmp/krb5_cc0
> /etc/krb5.keytab appear to be consistent now - checked with
> asetkey
> klist
> kvno
>
> They wern't consistent previously..
>
> Any testing I can do I will..
>
> On Tue, Apr 21, 2009 at 8:32 AM, Jeffrey Altman
> <jaltman@secure-endpoints.com <mailto:jaltman@secure-endpoints.com>> wrote:
>
> Mircea Ciocan wrote:
>
> > IMHO, no matter what kerberos key b..s is happening this should not
> > produce this miserable kernel loop that kills the most powerful
> machines
> > available today, it either should have some slower cadence so that
> > eventually some could stop the AFS processes or it should give up
> after
> > some time, I this regard I consider this behavior a bug.
> >
> > Cheers,
> > Mircea
>
> In the good old days when server-A reported "bad kvno" the cache manager
> would discard the token even though it was possible that the token was
> in fact valid and would work on every other server in the cell. This
> is frequently a problem when a cell contains a mixture of pre-OpenAFS
> 1.2.8 or Transarc/IBM servers and post-OpenAFS 1.2.8 servers.
>
> A few releases ago a modification was made to prevent the token from
> being discarded and in the case of a replicated volume, to permit fail
> over to an alternate copy.
>
> I suspect the issue is somehow related to this because now the afs
> client will return a bad kvno error to the application instead of
> access denied. If the application repeatedly retries the request
> the kernel module will just ask the file servers again and produce the
> same result. If the application asks again, ....
>
> It would be helpful to know if the infinite loop is being driven by
> the application or is strictly within the kernel module.
>
> Jeffrey Altman
>
>
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