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From "Haohui Mai (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-10786) Patch that fixes UGI#reloginFromKeytab on java 8
Date Fri, 07 Nov 2014 21:37:34 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-10786?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14202737#comment-14202737
] 

Haohui Mai commented on HADOOP-10786:
-------------------------------------

Oh I see. The patch looks good to me. +1 pending jenkins.

> 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
>    Affects Versions: 2.6.0
>            Reporter: Tobi Vollebregt
>            Assignee: Stephen Chu
>         Attachments: HADOOP-10786.2.patch, HADOOP-10786.3.patch, HADOOP-10786.3.patch,
HADOOP-10786.4.patch, HADOOP-10786.5.patch, 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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