FreeIPA and Hadoop Distributions (HDP / CDH)

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FreeIPA is the tool of choice when it comes to implement a security architecture from the scratch today. I don't need to praise the advantages of FreeIPA, it speaks for himself. It's the Swiss knife of user authentication, authorization and compliance.

To implement FreeIPA into Hadoop distributions like Hortonwork's HDP and Cloudera's CDH some tweaks are necessary, but the outcome is it worth. I assume that the FreeIPA server setup is done and the client tools are distributed. If not, the guide from Hortonworks has those steps included, too.

For Hortonworks, nothing more as the link to the documentation is necessary:
https://community.hortonworks.com/articles/59645/ambari-24-kerberos-with-freeipa.html

Ambari 2.4x has FreeIPA (Ambari-6432) support (experimental, but it works as promised) included. The setup and rollout is pretty simple and runs smoothly per Wizard.

For Cloudera it takes a bit more handwork, but it works at the end also perfect and well integrated, but not at the same UI level as Ambari. These steps are necessary to get Cloudera Manager working with FreeIPA:

1. create the CM principal in FreeIPA (example: cdh@ALO.ALT)
2. retrieve the keytab:
 ipa-getkeytab -r -s freeipa.alo.alt -p cdh -k cdh.keytab
3. install ipa-admintools on the Cloudera Manager server 
 yum install ipa-admintools -y
4. place the retrieval-script (from my GitHub) in /opt/cloudera/security/getkeytabs.sh (or another path accessible by cloudera manager), make it executable and owned by cloudera-scm
 chmod 775 /opt/cloudera/security/getkeytabs.sh && chown cloudera-scm: /opt/cloudera/security/getkeytabs.sh
5. Start the Kerberos wizard, but stop after verifying the cdh user
6. Set the configuration [1] for "Custom Kerberos Keytab Retrieval Script" to "/opt/cloudera/security/getkeytabs.sh"
7. resume the Kerberos wizard and follow the steps until its finished and restart the cluster.

Important:
The FreeIPA client from RHEL7 / CentOS 7 uses now memory based keytabs, but Java doesn't support them (yet). To switch back to the file based ticket cache, the config file (/etc/krb5.conf) needs to be altered by commenting default_ccache_name out, which let the client use the default file based ticket cache;

cat /etc/krb5.conf
..
# default_ccache_name = KEYRING:persistent:%{uid}
..


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