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https://issues.apache.org/jira/browse/HADOOP-16214?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16827162#comment-16827162
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Issac Buenrostro commented on HADOOP-16214:
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[~eyang] thanks for the security suggestions, many of our principals are indeed
host specific. Is it the case that adding more components to the principal will
prevent host specific principals to verify matching host?
For the proposal of mechanism == mit for multiple components, that seems
reasonable to me. Just to clarify, what do you mean by "more than 2 components
don't become service principal"?
> Kerberos name implementation in Hadoop does not accept principals with more
> than two components
> -----------------------------------------------------------------------------------------------
>
> Key: HADOOP-16214
> URL: https://issues.apache.org/jira/browse/HADOOP-16214
> Project: Hadoop Common
> Issue Type: Bug
> Components: auth
> Reporter: Issac Buenrostro
> Priority: Major
> Attachments: Add-service-freeipa.png, HADOOP-16214.001.patch,
> HADOOP-16214.002.patch, HADOOP-16214.003.patch, HADOOP-16214.004.patch,
> HADOOP-16214.005.patch, HADOOP-16214.006.patch, HADOOP-16214.007.patch,
> HADOOP-16214.008.patch, HADOOP-16214.009.patch, HADOOP-16214.010.patch,
> HADOOP-16214.011.patch
>
>
> org.apache.hadoop.security.authentication.util.KerberosName is in charge of
> converting a Kerberos principal to a user name in Hadoop for all of the
> services requiring authentication.
> Although the Kerberos spec
> ([https://web.mit.edu/kerberos/krb5-1.5/krb5-1.5.4/doc/krb5-user/What-is-a-Kerberos-Principal_003f.html])
> allows for an arbitrary number of components in the principal, the Hadoop
> implementation will throw a "Malformed Kerberos name:" error if the principal
> has more than two components (because the regex can only read serviceName and
> hostName).
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