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From "Kan Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-8758) Support for pluggable token implementations
Date Sun, 09 Sep 2012 18:31:08 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-8758?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13451646#comment-13451646
] 

Kan Zhang commented on HADOOP-8758:
-----------------------------------

> For example, one may need to set up pair-wise keys for NN/JT and Oozie/JT so that they
can make initial authenticated connections. Those pair-wise keys may be implemented by different
SecretManagers. On JT, both SecretManagers need to be configured for external auth using DIGEST-MD5.

Sorry, NN doesn't initiate connections to JT. I should have used JT/NN and Oozie/NN as examples.
In this case, both SecretManagers need to be configured on NN for JT and Oozie to make initial
authenticated connections to NN.
                
> Support for pluggable token implementations
> -------------------------------------------
>
>                 Key: HADOOP-8758
>                 URL: https://issues.apache.org/jira/browse/HADOOP-8758
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: ipc, security
>            Reporter: Kan Zhang
>            Assignee: Kan Zhang
>
> Variants of the delegation token mechanism have been employed by different Hadoop services
(NN, JT, RM, etc) to re-authenticate a previously Kerberos-authenticated client. While existing
delegation token mechanism compliments Kerberos well, it doesn't necessarily have to be coupled
with Kerberos. In principle, delegation tokens can be coupled with any authentication mechanism
that bootstraps security. In particular, it can be coupled with other token implementations
that use the same DIGEST-MD5 auth method. For example, a token can be pre-generated in an
out-of-band manner and configured as a shared secret key between NN and JT to allow JT to
make initial authentication to NN. This simple example doesn't deal with token renewal etc,
but it helps to illustrate the point that if we can support multiple pluggable token implementations,
it opens up the possibility for different users to plug in the token implementation of their
choice to bootstrap security. Such token based mechanism has advantages over Kerberos in that
1) it doesn't require Kerberos infrastructure, 2) it leverages existing SASL DIGEST-MD5 auth
method and doesn't require adding a new RPC auth method.

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