[OpenAFS] Does kadb_check work on linux?

[Jeffrey Altman]

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On 5/18/2015 3:51 PM, Stephen Roseman wrote:
> It's not important, but I thought I'd run kadb_check on a current
> kaserver.DB0 (yes, I'm planning to switch to K5 before I retire...) and=

> it complains about bad entries, and the -entries switch returns "funny
> stuff".
>=20
> I've run it on various Centos 6 systems, with openafs 1.6.1 to 1.6.11,
> pulling the file kaserver.DB0 from various places.  I generally compile=

> my own openafs, but I extracted a kadb_check binary from the release
> 1.6.11.1 rpm.  Always the same.
>=20
> I copied kaserver.DB0 to an old AIX system, and its kadb_check works fi=
ne.
>=20
> https://lists.openafs.org/pipermail/openafs-info/2010-April/033520.html=

> mentions "/2/ fix kadb_check to produce correct output.  Should match o=
n
> little and big-endian machines."
>=20
> Should I just forget about the whole thing and go home?
>=20
> Thanks,
> Steve

To be clear, migrating away from kaserver is not just a nice thing to
do.  It is an absolute requirement if you care about preserving the
privacy and integrity of the data maintained in your cell.  Since the
announcement of

  https://www.openafs.org/pages/security/#OPENAFS-SA-2013-003

which is not an AFS specific issue but impacts all network services that
use Kerberos for authentication and have DES keys assigned to them.
kaserver is the worst case of this because unlike up to date Kerberos v5
KDCs kaserver only supports DES.

In brief, if the attacker can request a service ticket that includes a
DES service key, the attacker can brute force the key and begin to force
Kerberos tickets in less than a day and for the cost of a few beers in NY=
C.

Since April 2010 there have been a large number of fixes to kaserver to
correct issues that were identified by Coverity, clang, and other
automated tools.  As well as some changes that were instituted across
the entire source tree.  There is very limited if any testing of
kaserver and related tools any longer.  As such it would not surprise me
for there to still be endian issues.  If you care to fix them, patches
can be submitted against the master branch via

   http://gerrit.openafs.org/

Please read the guidance at http://wiki.openafs.org/GitDevelopers/
before submitting any patches.  It is unlikely that anyone that isn't
actively using kaserver will volunteer to fix it.

Jeffrey Altman



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