[DIRKRB-614] Kerby (simplekdc) fails to handle unknown PADATA

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.0.0-RC2
• Fix Version/s: 1.0.1
• Environment: SimpleKDC
• Assignee: Jiajia Li
• Reporter: Bolke de Bruin
• Created: 26/Nov/16 17:50
• Updated: 04/Sep/17 10:53
• Resolved: 19/Jun/17 05:22

Description

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.

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(KrbCodec.java:85)
	at org.apache.kerby.kerberos.kerb.KrbCodec.decode(KrbCodec.java:70)
	at org.apache.kerby.kerberos.kerb.server.request.KdcRequest.kdcFindFast(KdcRequest.java:208)
	at org.apache.kerby.kerberos.kerb.server.request.KdcRequest.process(KdcRequest.java:168)
	at org.apache.kerby.kerberos.kerb.server.KdcHandler.handleMessage(KdcHandler.java:115)
	at org.apache.kerby.kerberos.kerb.server.impl.DefaultKdcHandler.handleMessage(DefaultKdcHandler.java:67)
	at org.apache.kerby.kerberos.kerb.server.impl.DefaultKdcHandler.run(DefaultKdcHandler.java:52)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at java.lang.Thread.run(Thread.java:745)
Caused by: java.io.IOException: Unexpected item context [0] [tag=0xA0, off=0, len=3+198], expecting 0x30
	at org.apache.kerby.asn1.type.Asn1Encodeable.decode(Asn1Encodeable.java:210)
	at org.apache.kerby.asn1.type.Asn1Encodeable.decode(Asn1Encodeable.java:197)
	at org.apache.kerby.kerberos.kerb.KrbCodec.decode(KrbCodec.java:83)
	... 9 more

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.

Issue Links

• duplicates: DIRKRB-631 Not compatible with MIT Kerberos 1.11+