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From Anurag Panda <panu...@in.ibm.com>
Subject MAC error
Date Fri, 05 Apr 2013 12:43:29 GMT

Hi,


We are using Apache MINA SSHD. We want to enable use of hmac-sha2-256 &
hmac-sha2-512 algorithms as per RFC 6668. We have created Factory classes
for these algorithms and have set the factory classes in the SshServer
class. But following exception is being thrown:

org.apache.sshd.common.SshException: MAC Error
at org.apache.sshd.common.session.AbstractSession.decode
(AbstractSession.java:481)
at org.apache.sshd.common.session.AbstractSession.messageReceived
(AbstractSession.java:230)
at org.apache.sshd.common.AbstractSessionIoHandler.messageReceived
(AbstractSessionIoHandler.java:72)
at org.apache.mina.core.filterchain.DefaultIoFilterChain
$TailFilter.messageReceived(DefaultIoFilterChain.java:713)
at
org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived
(DefaultIoFilterChain.java:434)
at org.apache.mina.core.filterchain.DefaultIoFilterChain.access$5
(DefaultIoFilterChain.java:429)
at org.apache.mina.core.filterchain.DefaultIoFilterChain$EntryImpl
$1.messageReceived(DefaultIoFilterChain.java:793)
at org.apache.mina.core.filterchain.IoFilterAdapter.messageReceived
(IoFilterAdapter.java:119)
at
org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived
(DefaultIoFilterChain.java:434)
at
org.apache.mina.core.filterchain.DefaultIoFilterChain.fireMessageReceived
(DefaultIoFilterChain.java:426)
at org.apache.mina.core.polling.AbstractPollingIoProcessor.read
(AbstractPollingIoProcessor.java:638)
at org.apache.mina.core.polling.AbstractPollingIoProcessor.process
(AbstractPollingIoProcessor.java:598)
at org.apache.mina.core.polling.AbstractPollingIoProcessor.process
(AbstractPollingIoProcessor.java:587)
at org.apache.mina.core.polling.AbstractPollingIoProcessor.access$7
(AbstractPollingIoProcessor.java:584)
at org.apache.mina.core.polling.AbstractPollingIoProcessor$Processor.run
(AbstractPollingIoProcessor.java:969)
at org.apache.mina.util.NamePreservingRunnable.run
(NamePreservingRunnable.java:64)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask
(ThreadPoolExecutor.java:897)
at java.util.concurrent.ThreadPoolExecutor$Worker.run
(ThreadPoolExecutor.java:919)
at java.lang.Thread.run(Thread.java:736)



>From the client library, we were able to connect to another server
successfully using hmac-sha2-256. So why is this exception being thrown in
Apache SSHD server & how can it be resolved?



Thanks & regards,

Anurag,

Advisory Software Engineer,
B2B & Commerce, Industry Solutions, ISL, IBM,
#4/1, 2nd floor, Tower D, IBC Knowledge Park, Bannerghatta road, Bangalore,
India - 560029.
Phone (O): +91-80-49126451, ext: 26451, Tie-line: 26451.


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