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From "Chris Nauroth (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-11699) _HOST not consistently resolving to lowercase fully qualified hostname on Windows
Date Tue, 10 Mar 2015 21:39:38 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-11699?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14355772#comment-14355772
] 

Chris Nauroth commented on HADOOP-11699:
----------------------------------------

[~jnp], thanks for pointing that out.  In that case, it seems like {{SecurityUtil#getLocalHostName}}
ought to return lower case in all environments, not just Windows, for agreement with {{KerberosUtil#getServicePrincipal}}.
 Also, we should use {{StringUtils#toLowerCase}} for the correct locale handling.

> _HOST not consistently resolving to lowercase fully qualified hostname on Windows
> ---------------------------------------------------------------------------------
>
>                 Key: HADOOP-11699
>                 URL: https://issues.apache.org/jira/browse/HADOOP-11699
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: security
>    Affects Versions: 2.6.0
>            Reporter: Kevin Minder
>            Assignee: Brahma Reddy Battula
>
> The _HOST marker used for Kerberos principals in various configuration files does not
always return lowercase fully qualified hostnames.  For example this setting in hdfs-site.xml
> {code}
> <property>
>   <name>dfs.namenode.kerberos.principal</name>
>   <value>hdfs/_HOST@YOURREALM.COM</value>
> </property>
> {code}
> In particular, this is impeding our work to have Hadoop work with equivalent security
on Windows as on Linux.
> In the windows env in which I'm having the issue, I was able to get a fully qualified
host name using this version of method getLocalHostName() in .  
> hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/SecurityUtil.java
> {code:java}
>   public static String getLocalHostName() throws UnknownHostException {
>     String hostname = InetAddress.getLocalHost().getCanonicalHostName();
>     if ( !hostname.contains( "." ) ) {
>       final String os = System.getProperties().getProperty( "os.name", "?" ).toLowerCase();
>       if ( os.startsWith( "windows" ) ) {
>         String domain = System.getenv( "USERDNSDOMAIN" );
>         if ( domain != null ) {
>           hostname += "." + domain.trim();
>         }
>       }
>     }
>     return hostname == null ? "localhost" : hostname.toLowerCase();
>   }
> {code}



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