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From "Tobi Vollebregt (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-10786) Patch that fixes UGI#reloginFromKeytab on java 8
Date Sat, 05 Jul 2014 05:06:34 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-10786?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Tobi Vollebregt updated HADOOP-10786:
-------------------------------------

    Status: Patch Available  (was: Open)

> 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
>            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 was 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, the isKeyTab
is set to true, and otherwise it's 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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