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From "Kan Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-8758) Support for pluggable token implementations
Date Sat, 01 Sep 2012 19:45:07 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-8758?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13446789#comment-13446789
] 

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

Upon initial look at the code, it seems the changes required to the RPC layer is small and
low risk. The main changes seem to be passing in a list of SecretManagers, instead of just
one, to the constructor of SaslDigestCallbackHandler. And the callback handler's private method
getPassorword() needs to consult all SecretManagers in turn and return the first password
found. No changes to the flow of connection setup. Changes are localized to how we return
the required token password when given a token identifier.

                
> 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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