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Posted to common-issues@hadoop.apache.org by "Carl Steinbach (JIRA)" <ji...@apache.org> on 2014/09/13 06:01:35 UTC
[jira] [Commented] (HADOOP-10786) Patch that fixes
UGI#reloginFromKeytab on java 8
[ https://issues.apache.org/jira/browse/HADOOP-10786?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14132514#comment-14132514 ]
Carl Steinbach commented on HADOOP-10786:
-----------------------------------------
[~Tobi], thanks for sharing this patch. We encountered the same problem on a Hadoop 2.3.0 cluster and were able to resolve it with this change.
> Patch that fixes UGI#reloginFromKeytab on java 8
> ------------------------------------------------
>
> Key: HADOOP-10786
> URL: https://issues.apache.org/jira/browse/HADOOP-10786
> Project: Hadoop Common
> Issue Type: Bug
> Components: security
> Reporter: Tobi Vollebregt
> Assignee: Tobi Vollebregt
> Priority: Minor
> Attachments: HADOOP-10786.patch
>
>
> Krb5LoginModule changed subtly in java 8: in particular, if useKeyTab and storeKey are specified, then only a KeyTab object is added to the Subject's private credentials, whereas in java <= 7 both a KeyTab and some number of KerberosKey objects were added.
> The UGI constructor checks whether or not a keytab was used to login by looking if there are any KerberosKey objects in the Subject's private credentials. If there are, then isKeyTab is set to true, and otherwise it's set to false.
> Thus, in java 8 isKeyTab is always false given the current UGI implementation, which makes UGI#reloginFromKeytab fail silently.
> Attached patch will check for a KeyTab object on the Subject, instead of a KerberosKey object. This fixes relogins from kerberos keytabs on Oracle java 8, and works on Oracle java 7 as well.
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