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https://issues.apache.org/jira/browse/NIFI-4022?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16113136#comment-16113136
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ASF GitHub Bot commented on NIFI-4022:
--------------------------------------
Github user bbende commented on the issue:
https://github.com/apache/nifi/pull/2046
Reviewing...
> Use SASL Auth Scheme For Secured Zookeeper Client Interaction
> -------------------------------------------------------------
>
> Key: NIFI-4022
> URL: https://issues.apache.org/jira/browse/NIFI-4022
> Project: Apache NiFi
> Issue Type: Bug
> Affects Versions: 1.2.0
> Reporter: Yolanda M. Davis
> Assignee: Yolanda M. Davis
>
> NiFi uses Zookeeper to assist in cluster orchestration including leader
> elections for Primary Node and Cluster Coordinator and to store state for
> various processors (such as MonitorActivity). In secured Zookeeper
> environments (supported by SASL + Kerberos) NiFi should protect the zNodes it
> creates to prevent users or hosts, outside of a NiFi cluster, from accessing
> or modifying entries. In its current implementation security can be enforced
> for processors that store state information in Zookeeper, however zNodes used
> for managing Primary Node and Cluster Coordinator data are left open and
> susceptible to change from any user. Also when zNodes are secured for
> processor state, a “Creator Only” policy is used which allows the system to
> determine the identification of the NiFi node and protect any zNodes created
> with that node id using Zookeeper’s “auth” scheme. The challenge with this
> scheme is that it limits the ability for other NiFi nodes in the cluster to
> access that zNode if needed (since it is specifically binds that zNode to the
> unique id of its creator).
>
> To best protect zNodes created in Zookeeper by NiFi while maximizing NiFi’s
> ability to share information across the cluster I propose that we move to
> using Zookeeper’s SASL authentication scheme, which will allow the use of
> Kerberos principals for securing zNode with the appropriate permissions. For
> maximum flexibility, these principals can be mapped appropriately in
> Zookeeper, using auth-to-local rules, to ensure that nodes across the cluster
> can share zNodes as needed.
>
> Potential Concerns/Challenges for Discussion:
>
> 1) For existing NiFi users how will we migrate Zookeeper entries from
> the old security scheme to the new scheme?
> 2) How should zNodes be reverted to open if kerberos is disabled?
> 3) What will the performance impact be on the cluster once SASL scheme
> is enabled (since we’d be moving from open to protected)? Would require
> investigation
> 4) Currently users can control authentication scheme via state
> management configuration for processors yet not for clusters. Should we
> still maintain the practice of allowing schemes to be configurable for
> processors (with SASL being the new default)?
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