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https://issues.apache.org/jira/browse/HADOOP-8043?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13205740#comment-13205740
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Allen Wittenauer commented on HADOOP-8043:
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bq. this is the exact hostname caller used in the URL and this could be an IP,
just the hostname, the hostname + domain, a DNS alias
That's dealt with as part of the forward and reverse lookup chain. The (final)
address we get is FQDN as blessed by DNS.
> KerberosAuthenticationFilter and friends have some problems
> -----------------------------------------------------------
>
> Key: HADOOP-8043
> URL: https://issues.apache.org/jira/browse/HADOOP-8043
> Project: Hadoop Common
> Issue Type: Bug
> Components: security
> Affects Versions: 1.0.0
> Reporter: Allen Wittenauer
> Priority: Critical
> Attachments: HADOOP-8043-branch-1.0.txt
>
>
> KerberosAuthenticationFilter and friends have three killer usability issues
> and bugs:
> 1. Documentation is misleading/wrong.
> 2. Shared secret stored in a world readable file.
> 3. Lacks support for _HOST macro
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