[OpenAFS] Re: OpenAFS 1.6.5/1.6.10 - server segfaults during migration to rxkad-k5

[Jeffrey Altman]

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On 11/7/2014 12:42 PM, Benjamin Kaduk wrote:
> On Fri, 7 Nov 2014, Brandon Allbery wrote:
>=20
>> On Fri, 2014-11-07 at 11:15 -0600, Andrew Deason wrote:
>>> It seems likely the 0 kvno is the problem. We only copy in a principa=
l
>>> if the kvno in the keytab is greater than 'vno' in
>>> akimpersonate.c:pick_principal, which starts out at 0. I assume that'=
s
>>> valid and we just hadn't encountered this yet?
>>
>> I don't think it's supposed to be possible to have a kvno of 0 with a
>> true Kerberos (4 or 5). kaserver, on the other hand, considered it val=
id
>> and used 0 as the initial kvno; this has caused problems for me in the=

>> past when migrating from kaserver to Kerberos.
>=20
> If I remember correctly, kvno 0 was used by certain versions of windows=
'
> krb5 implementations, but the Unix krb5 implementations do not generate=
 it
> without manual override.
>=20
> -Ben


Key version number 0 means use the latest key.   It is a valid number
for a key tab entry and should not result in a crash.

Windows Server 2000 did not support key version numbers and all
references to a key version number were 0.

Jeffrey Altman



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