Sean Roberts created NIFI-5973:
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Summary: NiFi: Add 'unix' or 'hadoop' user-group-provider
Key: NIFI-5973
URL: https://issues.apache.org/jira/browse/NIFI-5973
Project: Apache NiFi
Issue Type: Bug
Reporter: Sean Roberts
NiFi currently supports these group mappings:
- File
- LDAP
Benefits of Unix or Hadoop based group identity:
- File is now allowed any many environments as it's not integrated with the
corporations identity system (typically AD or another LDAP).
- LDAP adds a lot of complexity, overhead, and tons of up-front config per
environment.
- Most services, including those related to Hadoop, are moving to Unix based
group lookups.
How it works and some possible method to implement:
- Linux users/groups come from the "Name Service Switch" (aka "nss").
- Here are the Linux native commands to query it:
-- show all users: `getent passwd`
-- show specific user: `getent group %s`
-- show all groups: `getent group`
-- show specific group: `getent group %s`
- hadoop-common has it's own libraries for accessing `nss`. Example of Knox's
implementation:
https://github.com/apache/knox/blob/master/gateway-provider-identity-assertion-hadoop-groups/src/main/java/org/apache/knox/gateway/identityasserter/hadoop/groups/filter/HadoopGroupProviderFilter.java
- ranger usersync calls `getent` directly:
https://github.com/apache/ranger/blob/da29d1929a54b2b579a74da32e5ea074d0f8e15d/ugsync/src/main/java/org/apache/ranger/unixusersync/process/UnixUserGroupBuilder.java#L49-L51
- there are modules in most programming languages to access `nss`.
Advantages of this method:
- little to no configuration: There is nothing customer or cluster specific to
configure. (i.e. it "just works" with the default configs).
- ease of change: if all services use this approach, you don't have to update
dozens of services every time LDAP changes.
- a lot less overhead: The OS has the users/groups. All of the services running
the OS simply check locally for users/groups. Spares the LDAP servers and our
machines from doing all the lookups.
- group names are guaranteed to be consistent across services.
- as this is becoming the standard in Knox, it makes KnoxSSO more stable.
- less concern about LDAP credentials all over the place.
- easier to pass security/compliance tests since we are utilising the customers
existing identity infrastructure.
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