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From "Kai Zheng (JIRA)" <>
Subject [jira] [Commented] (DIRKRB-614) Kerby (simplekdc) fails to handle unknown PADATA
Date Mon, 05 Jun 2017 01:39:04 GMT


Kai Zheng commented on DIRKRB-614:

Hi [~coheig],

Looks like two issues were exposed here, one is the decoding issue for the unknown PADATA,
the other is, we probably shouldn't run into the FAST things given the preauth is disabled.

Hope we can get to this sooner. Sorry for the late.

> Kerby (simplekdc) fails to handle unknown PADATA 
> -------------------------------------------------
>                 Key: DIRKRB-614
>                 URL:
>             Project: Directory Kerberos
>          Issue Type: Bug
>    Affects Versions: 1.0.0-RC2
>         Environment: SimpleKDC 
>            Reporter: Bolke de Bruin
>         Attachments: kerb_heimdal.pcapng, kerb.pcap
> I am using simplekdc wrapped in an application to allow CI for Apache Airflow.
> While testing I found out that on my development system (OS X - Heimdal with MIT Shim)
everything worked fine, but when moving over to the CI (MIT) system it stopped working with
the following error.
> {code}
> 2016-11-26 17:08:51,974 ERROR [pool-1-thread-3] impl.DefaultKdcHandler: Error occured
while processing request:
> org.apache.kerby.kerberos.kerb.KrbException: Decoding failed
> 	at org.apache.kerby.kerberos.kerb.KrbCodec.decode(
> 	at org.apache.kerby.kerberos.kerb.KrbCodec.decode(
> 	at org.apache.kerby.kerberos.kerb.server.request.KdcRequest.kdcFindFast(
> 	at org.apache.kerby.kerberos.kerb.server.request.KdcRequest.process(
> 	at org.apache.kerby.kerberos.kerb.server.KdcHandler.handleMessage(
> 	at org.apache.kerby.kerberos.kerb.server.impl.DefaultKdcHandler.handleMessage(
> 	at
> 	at java.util.concurrent.ThreadPoolExecutor.runWorker(
> 	at java.util.concurrent.ThreadPoolExecutor$
> 	at
> Caused by: Unexpected item context [0] [tag=0xA0, off=0, len=3+198],
expecting 0x30
> 	at org.apache.kerby.asn1.type.Asn1Encodeable.decode(
> 	at org.apache.kerby.asn1.type.Asn1Encodeable.decode(
> 	at org.apache.kerby.kerberos.kerb.KrbCodec.decode(
> 	... 9 more
> {code}
> Digging in with Wireshark showed that the MIT libraries are sending extra PAData which
makes Kerby not respond (Wireshark records this as "Unknown 136"). This behavior can be replicated
by using "kvno". 
> Heimdal on OSX does not send this and gets a response.

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