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From "Erik Krogen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-16214) Kerberos name implementation in Hadoop does not accept principals with more than two components
Date Tue, 16 Apr 2019 15:07:00 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-16214?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16819131#comment-16819131
] 

Erik Krogen commented on HADOOP-16214:
--------------------------------------

Though I'd like to move forward with supporting our use case, I think I agree with Daryn that
we shouldn't break existing semantics, at least not within a major version. It's difficult
for us to say who might be relying on the current parsing semantics. At minimum if we are
going to do so, I think we should have a DISCUSS thread to alert others about the change and
gather additional feedback for how the existing semantics are being leveraged.

I've only loosely followed the discussion above, but if there is a way to support our use
case without breaking compatibility, as I believe Daryn states above that he supplied, I am
+1 for that.

> 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: 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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