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https://issues.apache.org/jira/browse/HADOOP-8758?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13451640#comment-13451640
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Kan Zhang commented on HADOOP-8758:
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> We could consider supporting multiple internal auth methods, but currently I
> don't see a need.
By enabling DIGEST-MD5 to be used as both internal and external auth methods
and pluggable token implementation, it's possible to configure multiple token
implementations for both internal and external authentication, although there
is only one auth method (DIGEST-MD5). I can see some use cases for external
auth, but currently no use case for internal auth to use multiple token
implementations. 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.
> 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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