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https://issues.apache.org/jira/browse/HADOOP-9392?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13659243#comment-13659243
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Kai Zheng commented on HADOOP-9392:
-----------------------------------

Thomas - Identity Token represents the identity and will be used to access all 
Hadoop services. However, any service can have its own TAS deployed to 
authenticate the identity token. Of course in most cases they can share the 
same TAS instance. The token sure has an expiration time and user can also 
initiate token expire command to expire it earlier. The token can be cached and 
the cache is to be expired at a configurable internal.
                
> Token based authentication and Single Sign On
> ---------------------------------------------
>
>                 Key: HADOOP-9392
>                 URL: https://issues.apache.org/jira/browse/HADOOP-9392
>             Project: Hadoop Common
>          Issue Type: New Feature
>          Components: security
>            Reporter: Kai Zheng
>            Assignee: Kai Zheng
>             Fix For: 3.0.0
>
>         Attachments: token-based-authn-plus-sso.pdf
>
>
> This is an umbrella entry for one of project Rhino’s topic, for details of 
> project Rhino, please refer to 
> https://github.com/intel-hadoop/project-rhino/. The major goal for this entry 
> as described in project Rhino was 
>  
> “Core, HDFS, ZooKeeper, and HBase currently support Kerberos authentication 
> at the RPC layer, via SASL. However this does not provide valuable attributes 
> such as group membership, classification level, organizational identity, or 
> support for user defined attributes. Hadoop components must interrogate 
> external resources for discovering these attributes and at scale this is 
> problematic. There is also no consistent delegation model. HDFS has a simple 
> delegation capability, and only Oozie can take limited advantage of it. We 
> will implement a common token based authentication framework to decouple 
> internal user and service authentication from external mechanisms used to 
> support it (like Kerberos)”
>  
> We’d like to start our work from Hadoop-Common and try to provide common 
> facilities by extending existing authentication framework which support:
> 1.    Pluggable token provider interface 
> 2.    Pluggable token verification protocol and interface
> 3.    Security mechanism to distribute secrets in cluster nodes
> 4.    Delegation model of user authentication

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