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From "Daryn Sharp (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-9461) JobTracker and NameNode both grant delegation tokens to non-secure clients
Date Mon, 08 Apr 2013 19:29:16 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-9461?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13625705#comment-13625705
] 

Daryn Sharp commented on HADOOP-9461:
-------------------------------------

bq. ERROR org.apache.hadoop.security.UserGroupInformation: PriviledgedActionException as:mapred
(auth:SIMPLE) cause:org.apache.hadoop.security.AccessControlException: Client mapred tries
to renew a token with renewer specified as mr token

This is the issue I expected to see - which is resolved by YARN-320.  It's only an issue if
security is enabled and a job needs to submit a sub-job more than 1d later.  Even though an
insecure JT is issuing tokens, an insecure client won't send the token, and even if it does,
the insecure JT tells the client to switch back to SIMPLE.

If you want to backport YARN-320, it shouldn't be too hard.  The suboptimal workaround for
secure clusters is to increase the MR token's expiration to something like 1w so renewal isn't
necessary.

bq. WARN org.apache.hadoop.security.token.Token: Cannot find class for token kind MAPREDUCE_DELEGATION_TOKEN

This is odd because it found the class to get the mismatched renewer error.  Maybe I'm misremembering
the token types in 1.x.
                
> JobTracker and NameNode both grant delegation tokens to non-secure clients
> --------------------------------------------------------------------------
>
>                 Key: HADOOP-9461
>                 URL: https://issues.apache.org/jira/browse/HADOOP-9461
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: security
>            Reporter: Harsh J
>            Assignee: Harsh J
>            Priority: Minor
>
> If one looks at the MAPREDUCE-1516 added logic in JobTracker.java's isAllowedDelegationTokenOp()
method, and apply non-secure states of UGI.isSecurityEnabled == false and authMethod == SIMPLE,
the return result is true when the intention is false (due to the shorted conditionals).
> This is allowing non-secure JobClients to easily request and use DelegationTokens and
cause unwanted errors to be printed in the JobTracker when the renewer attempts to run. Ideally
such clients ought to get an error if they request a DT in non-secure mode.
> HDFS in trunk and branch-1 both too have the same problem. Trunk MR (HistoryServer) and
YARN are however, unaffected due to a simpler, inlined logic instead of reuse of this faulty
method.
> Note that fixing this will break Oozie today, due to the merged logic of OOZIE-734. Oozie
will require a fix as well if this is to be fixed in branch-1. As a result, I'm going to mark
this as an Incompatible Change.

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