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From "Patrick Hunt (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ZOOKEEPER-2793) [QP MutualAuth]: Implement a mechanism to build "authzHosts" for dynamic reconfig servers
Date Thu, 16 Nov 2017 06:04:00 GMT

    [ https://issues.apache.org/jira/browse/ZOOKEEPER-2793?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16254811#comment-16254811
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Patrick Hunt commented on ZOOKEEPER-2793:
-----------------------------------------

I would say that all sounds reasonable. My main remaining concern is that we could end up
locking up the cluster and not being able to recover.

bq. Apart from the following case any other way the corruption can occur 

I guess anything where the list no longer reflects that the admin wants. Perhaps another example
is that you have a three node ensemble, two of the nodes die and you need to get two new ones.
Wouldn't that also be a valid example where we can recover today but not if this feature is
enabled?

Perhaps there is a control somewhere else that enables/disables this feature? In the worst-case
scenario the admin could disable, recover the cluster, reset the "authzhosts" and then re-enable.
That seems like a copout though. Is there a better way?


> [QP MutualAuth]: Implement a mechanism to build "authzHosts" for dynamic reconfig servers
> -----------------------------------------------------------------------------------------
>
>                 Key: ZOOKEEPER-2793
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2793
>             Project: ZooKeeper
>          Issue Type: Sub-task
>          Components: quorum, security
>            Reporter: Rakesh R
>            Assignee: Rakesh R
>             Fix For: 3.5.4, 3.6.0
>
>
> {{QuorumServer}} will do the authorization checks against configured authorized hosts.
During LE, QuorumLearner will send an authentication packet to QuorumServer. Now, QuorumServer
will check that the connecting QuorumLearner’s hostname exists in the authorized hosts.
If not exists then connecting peer is not authorized to join this ensemble and the request
will be rejected immediately. 
> In {{branch-3.4}} building {{authzHosts}} list is pretty straight forward, can use the
ensemble server details in zoo.cfg file. But with dynamic reconfig, it has to consider the
dynamic add/remove/update servers and need to discuss the ways to handle dynamic cases.



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