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https://issues.apache.org/jira/browse/ZOOKEEPER-1634?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15223418#comment-15223418
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Andrew Purtell commented on ZOOKEEPER-1634:
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You should read my comment as agreeing with other comments here that if
"authorization enforcement" didn't work with the current framework, but somehow
required TLS, then this would be unsatisfactory for all those environments
based on Kerberos
> A new feature proposal to ZooKeeper: authentication enforcement
> ---------------------------------------------------------------
>
> Key: ZOOKEEPER-1634
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1634
> Project: ZooKeeper
> Issue Type: New Feature
> Components: security, server
> Affects Versions: 3.4.5
> Reporter: Jaewoong Choi
> Fix For: 3.5.2, 3.6.0
>
> Attachments:
> zookeeper_3.4.5_patch_for_authentication_enforcement.patch
>
> Original Estimate: 72h
> Remaining Estimate: 72h
>
> Up to the version of 3.4.5, ZooKeeperServer doesn't force the authentication
> if the client doesn't give any auth-info through ZooKeeper#addAuthInfo method
> invocation. Hence, every znode should have at least one ACL assigned
> otherwise any unauthenticated client can do anything on it.
> The current authentication/authorization mechanism of ZooKeeper described
> above has several points at issue:
> 1. At security standpoint, a maleficent client can access a znode which
> doesn't have any proper authorization access control set.
> 2. At runtime performance standpoint, authorization for every znode to every
> operation is unnecessarily but always evaluated against the client who
> bypassed the authentication phase.
> In other words, the current mechanism doesn't address a certain requirement
> at below:
> "We want to protect a ZK server by enforcing a simple authentication to every
> client no matter which znode it is trying to access. Every connection (or
> operation) from the client won't be established but rejected if it doesn't
> come with a valid authentication information. As we don't have any other
> distinction between znodes in term of authorization, we don't want any ACLs
> on any znode."
> To address the issues mentioned above, we propose a feature called
> "authentication enforcement" to the ZK source. The idea is roughly but
> clearly described in a form of patch in the attached file
> (zookeeper_3.4.5_patch_for_authentication_enforcement.patch): which makes
> ZooKeeperServer enforce the authentication with the given 2 configurations:
> authenticationEnforced (boolean) and enforcedAuthenticationScheme (string)
> against every operation coming through ZooKeeperServer#processPacket method
> except for OpCode.auth operation. The repository base of the patch is
> "http://svn.apache.org/repos/asf/zookeeper/tags/release-3.4.5/";
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