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https://issues.apache.org/jira/browse/ZOOKEEPER-1634?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15223356#comment-15223356
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Flavio Junqueira commented on ZOOKEEPER-1634:
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Actually, we already support it:

https://cwiki.apache.org/confluence/display/ZOOKEEPER/ZooKeeper+SSL+User+Guide



> 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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