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From "Daryn Sharp (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-8758) Support for pluggable token implementations
Date Mon, 10 Sep 2012 15:00:09 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-8758?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13452039#comment-13452039
] 

Daryn Sharp commented on HADOOP-8758:
-------------------------------------

bq. Today, in terms of RPC, we have one external auth method (Kerberos) and one internal auth
method (DIGEST-MD5). And they are tightly coupled. By breaking that tight coupling, we can
make external auth methods (SIMPLE auth can be one, LDAP can be another) configurable.

Kerberos and tokens are _not_ coupled in any form.  The secret managers know nothing about
the authentication method.  Multiple auth methods, such as LDAP, can currently be added with
no change to the secret managers.

The blocking issue is that hadoop's SASL DIGEST-MD5 callbacks directly call the token secret
managers.  What it should do is call into a {{LoginContext}} which can be configured for multiple
auth methods.
                
> 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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