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From Lin Zhao <...@exabeam.com>
Subject Re: Is it possible to turn on data node encryption without kerberos?
Date Wed, 06 Apr 2016 23:29:58 GMT
Musty,

Thanks for the response. I saw the same issue on two environments, one versioned 2.6.0-cdh5.4.7,
rcf5ade14581a102afdf8b7689b31ef225e7362fc and the other 2.7.1, r15ecc87ccf4a0228f35af08fc56de536e6ce657a.

I've tried different combinations of the algorithm/key length. Latest I've tried is:

  <property>

    <name>dfs.encrypt.data.transfer</name>

    <value>true</value>

  </property>

  <property>

    <name>dfs.encrypt.data.transfer.algorithm</name>

    <value>3des</value>

  </property>

  <property>

    <name>dfs.encrypt.data.transfer.cipher.suites</name>

    <value>AES/CTR/NoPadding</value>

  </property>

  <property>

    <name>dfs.encrypt.data.transfer.cipher.key.bitlength</name>

    <value>128</value>

  </property>

From: Musty Rehmani <musty_rehmani@yahoo.com<mailto:musty_rehmani@yahoo.com>>
Reply-To: "musty_rehmani@yahoo.com<mailto:musty_rehmani@yahoo.com>" <musty_rehmani@yahoo.com<mailto:musty_rehmani@yahoo.com>>
Date: Wednesday, April 6, 2016 at 3:54 PM
To: Lin Zhao <lin@exabeam.com<mailto:lin@exabeam.com>>, "user@hadoop.apache.org<mailto:user@hadoop.apache.org>"
<user@hadoop.apache.org<mailto:user@hadoop.apache.org>>
Subject: Re: Is it possible to turn on data node encryption without kerberos?


Kerberos is used to authenticate user or service principal to grant access to cluster. It
doesn't encrypt data blocks coming in and out of cluster.
Sent from Yahoo Mail on Android<https://overview.mail.yahoo.com/mobile/?.src=Android>

On Wed, Apr 6, 2016 at 4:36 PM, Lin Zhao
<lin@exabeam.com<mailto:lin@exabeam.com>> wrote:
I've been trying to secure block data transferred by HDFS. I added below to hdfs-site.xml
and core-site xml to the data node and name node and restart both.


<property>
  <name>dfs.encrypt.data.transfer</name>
  <value>true</value>
</property>

<property>
  <name>hadoop.rpc.protection</name>
  <value>privacy</value>
</property>


When I try to put a file from the hdfs command line shell, the operation fails with "connection
is reset" and I see following from the datanode log:

"org.apache.hadoop.hdfs.server.datanode.DataNode: Failed to read expected encryption handshake
from client at /172.31.36.56:48271. Perhaps the client is running an older version of Hadoop
which does not support encryption"


I am able to reproduce this on two different deployments. I was following https://hadoop.apache.org/docs/r2.7.2/hadoop-project-dist/hadoop-common/SecureMode.html#Authentication,
but didn't turn on kerberos authentication. No authentication works in my environment. Can
this be the reason the handshake fails?

Any help is appreciated.

Thanks,

Lin Zhao

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