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From "Kihwal Lee (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-5628) Some namenode servlets should not be internal.
Date Wed, 04 Dec 2013 17:01:39 GMT
Kihwal Lee created HDFS-5628:
--------------------------------

             Summary: Some namenode servlets should not be internal.
                 Key: HDFS-5628
                 URL: https://issues.apache.org/jira/browse/HDFS-5628
             Project: Hadoop HDFS
          Issue Type: Bug
    Affects Versions: 2.2.0
            Reporter: Kihwal Lee


This is the list of internal servlets added by namenode.

| Name | Auth | Need to be accessible by end users |
| StartupProgressServlet | none | no |
| GetDelegationTokenServlet | internal SPNEGO | yes |
| RenewDelegationTokenServlet | internal SPNEGO | yes |
|  CancelDelegationTokenServlet | internal SPNEGO | yes |
|  FsckServlet | internal SPNEGO | yes |
|  GetImageServlet | internal SPNEGO | no |
|  ListPathsServlet | token in query | yes |
|  FileDataServlet | token in query | yes |
|  FileChecksumServlets | token in query | yes |
| ContentSummaryServlet | token in query | yes |

GetDelegationTokenServlet, RenewDelegationTokenServlet, CancelDelegationTokenServlet and FsckServlet
are accessed by end users, but hard-coded to use the internal SPNEGO filter.

If a name node HTTP server binds to multiple external IP addresses, the internal SPNEGO service
principal name may not work with an address to which end users are connecting.  The current
SPNEGO implementation in Hadoop is limited to use a single service principal per filter.

If the underlying hadoop kerberos authentication handler cannot easily be modified, we can
at least create a separate auth filter for the end-user facing servlets so that their service
principals can be independently configured. If not defined, it should fall back to the current
behavior.



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