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From "Daryn Sharp (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-8758) Support for pluggable token implementations
Date Tue, 04 Sep 2012 16:10:07 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-8758?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13447777#comment-13447777
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Daryn Sharp commented on HADOOP-8758:
-------------------------------------

As Bobby mentioned, and I've mentioned to Owen offline, I've really been wanting to configure
the login context to use an auth other than kerberos, yet still use a secret manager to generate
and validate tokens.  Many of the tough issues I've had to debug may be caught by the test
suites if simple auth used tokens too.

One problem to solve is that kerberos has crept up above the login context's abstraction,
ex. the UGI.  Although it's technically possible to use a different auth, there's a lot of
places where checks for kerberos is hardcoded.


                
> 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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