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https://issues.apache.org/jira/browse/HADOOP-14295?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Yuanbo Liu updated HADOOP-14295:
--------------------------------
    Summary: Authentication proxy filter may fail authorization because of 
getRemoteAddr  (was: Authentication proxy filter on firewall cluster may fail 
authorization because of getRemoteAddr)

> Authentication proxy filter may fail authorization because of getRemoteAddr
> ---------------------------------------------------------------------------
>
>                 Key: HADOOP-14295
>                 URL: https://issues.apache.org/jira/browse/HADOOP-14295
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: common
>    Affects Versions: 2.7.4, 3.0.0-alpha2, 2.8.1
>            Reporter: Jeffrey E  Rodriguez
>            Assignee: Jeffrey E  Rodriguez
>            Priority: Critical
>             Fix For: 3.0.0-alpha2
>
>         Attachments: hadoop-14295.001.patch, HADOOP-14295.002.patch, 
> HADOOP-14295.003.patch
>
>
> Many production environments use firewalls to protect network traffic. In the 
> specific case of DataNode UI and other Hadoop server for which their ports 
> may fall on the list of firewalled ports the 
> org.apache.hadoop.security.AuthenticationWithProxyUserFilter user getRemotAdd 
> (HttpServletRequest) which may return the firewall host such as 127.0.0.1.
> This is unfortunately bad since if you are using a proxy in addition to do 
> perimeter protection, and you have added your proxy as a super user when  
> checking for the proxy IP to authorize user this would fail since 
> getRemoteAdd would return the IP of the firewall (127.0.0.1).
> "2017-04-08 07:01:23,029 ERROR security.AuthenticationWithProxyUserFilter 
> (AuthenticationWithProxyUserFilter.java:getRemoteUser(94)) - Unable to verify 
> proxy user: Unauthorized connection for super-user: knox from IP 127.0.0.1"
> I propese to add a check for x-forwarded-for header since proxys usually 
> inject that header before we do a getRemoteAddr



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