[OpenAFS] About the upgrading from kaserver toKerberos 5

[Jeffrey Altman]

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On 5/15/2018 11:24 AM, huangql wrote:
> Hi Jeffrey,
>=20
>=20
> Thanks for your prompt and constructive reply.
>=20
>=20
> If the afs2k5db tool was compiled=C2=A0against OpenAFS 1.2 and MIT Kerb=
eros
> 1.2, does it work for=C2=A0Openafs-1.4.14-1 version under 64bit ?

As I indicated, the kaserver database file format has not changed.
Therefore, it should not matter.

> Or is there other method to migrate the users to kdc 5?

Well, IHEP could just bring up a new Kerberos v5 realm and create all
necessary client and server principals from scratch.

At this point that might not be such a bad idea.   The kaserver (being
Kerberos v4 based) only supports DES-CBC-CRC 56-bit keys.  Those keys
can be brute forced in under 20 hours.  The krbtgt and afs keys are
particularly vulnerable.  Theft of them permits any identity to be
forged.  Copying these keys into the new Kerberos v5 realm is pointless
as they must be replaced immediately.

The client configurations will have to be updated in any case to deploy
Kerberos v5 libraries and configuration files.  My recommendation is to
start from scratch with Kerberos v5 and configure the AFS cell to accept
both kaserver and Kerberos v5 for authentication.  See the OpenAFS
krb.conf man page.

Again, good luck.

Jeffrey Altman

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