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