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https://issues.apache.org/jira/browse/AMBARI-11524?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14564939#comment-14564939
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Emil Anca commented on AMBARI-11524:
------------------------------------
Yeah I just noticed the 500 Error on the review link.
Very weird as it was working earlier today.
> Kerberos: using realm name with mixed case, /etc/krb5.conf's default realm
> was forced to uppercase
> --------------------------------------------------------------------------------------------------
>
> Key: AMBARI-11524
> URL: https://issues.apache.org/jira/browse/AMBARI-11524
> Project: Ambari
> Issue Type: Bug
> Components: ambari-server
> Affects Versions: 2.0.0
> Reporter: Emil Anca
> Assignee: Emil Anca
> Priority: Critical
> Fix For: 2.1.0
>
> Attachments: AMBARI-11524_01.patch
>
>
> I've set up a KDC with the default realm and realm as CUSTOM.com in
> /etc/krb5.conf, created the kdc database, created admin principal
> admin/[email protected], made sure I can run kadmin (and not just
> kadmin.local) and create new principals using the admin principal by editing
> /var/kerberos/krb5kdc/kadm5.acl and restarting the kdc/kadmin services.
> Also, with this set up, I verified that I can run "kinit" without the
> explicit realm name of CUSTOM.com, as it is the default realm (e.g., "kinit
> testuser" kinits as [email protected])
> I ran the Kerberos Wizard and faced some issues, because
> the default krb5 template forces uppercase for the default_realm in
> /etc/krb5.conf. Also, it looks like it forces uppercasing on domain entries
> in case these are specified, though I did not test the latter:
> {code}
> [libdefaults]
> renew_lifetime = 7d
> forwardable = true
> default_realm = {{realm|upper()}} <-- FORCES UPPERCASE
> ticket_lifetime = 24h
> dns_lookup_realm = false
> dns_lookup_kdc = false
> #default_tgs_enctypes = {{encryption_types}}
> #default_tkt_enctypes = {{encryption_types}}
> {% if domains %}
> [domain_realm]
> {% for domain in domains.split(',') %}
> {{domain}} = {{realm|upper()}} <-- FORCES UPPERCASE
> {% endfor %}
> {% endif %}
> [logging]
> default = FILE:/var/log/krb5kdc.log
> admin_server = FILE:/var/log/kadmind.log
> kdc = FILE:/var/log/krb5kdc.log
> [realms]
> {{realm}} = { <-- UPPERCASE NOT FORCED (AS DESIRED)
> admin_server = {{admin_server_host|default(kdc_host, True)}}
> kdc = {{kdc_host}}
> }
> {# Append additional realm declarations below #}
> {code}
> I observed two issues.
> 1. My /etc/krb5.conf entry *default_realm = CUSTOM.com* was overwritten by
> Ambari as *default_realm = CUSTOM.COM*. So after the wizard ran, the
> default realm is set to a non-existent realm. So kerberos commands now
> require an explicit @CUSTOM.com for kinit, etc. This is an undesired and
> unexpected side effect.
> My /etc/krb5.conf looked like the following after being modified via Ambari:
> {code}
> [libdefaults]
> renew_lifetime = 7d
> forwardable = true
> default_realm = CUSTOM.COM <-- FORCED TO UPPERCASE. CUSTOM.COM DOES NOT
> EXIST
> ticket_lifetime = 24h
> dns_lookup_realm = false
> dns_lookup_kdc = false
> #default_tgs_enctypes = aes des3-cbc-sha1 rc4 des-cbc-md5
> #default_tkt_enctypes = aes des3-cbc-sha1 rc4 des-cbc-md5
> [logging]
> default = FILE:/var/log/krb5kdc.log
> admin_server = FILE:/var/log/kadmind.log
> kdc = FILE:/var/log/krb5kdc.log
> [realms]
> CUSTOM.com = { <-- WAS NOT FORCED TO UPPERCASE (GOOD)
> admin_server = y2-1.c.pramod-thangali.internal
> kdc = y2-1.c.pramod-thangali.internal
> }
> {code}
> 2. Because of the above, for the admin principal name in the UI, you have to
> type "admin/[email protected]" where as if you had all uppercase realm, like
> CUSTOM.COM, then you can just type "admin/admin".
> It seems like we should not be forcing uppercase on the default realm in the
> template. If upper() is removed from the template, this problem does not
> occur, and it works the same way as in the case where the realm name was all
> uppercase.
> 3. I just used the admin/[email protected] for the admin principal (note the
> explicit realm name) and was able to pass Test Kerberos step with CUSTOM.com
> realm. However, in the Start and Test Services part of the Wizard, it failed
> at Check ZooKeeper.
> I'm not sure if this is because of the mixed case or the default realm being
> wrong. I was running a kerberization test in parallel with the same
> Ambari/HDP build, and I did not hit any issues (I just used the default
> EXAMPLE.COM for the one that succeeded).
> Succeeded cluster with EXAMPLE.COM:
> y1-1.c.pramod-thangali.internal 104.196.80.112 10.240.164.253 4h <-
> Ambari server
> y1-2.c.pramod-thangali.internal 104.196.89.113 10.240.143.145 4h
> y1-3.c.pramod-thangali.internal 104.196.83.169 10.240.232.100 4h
> Failed cluster with CUSTOM.com:
> y2-1.c.pramod-thangali.internal 104.196.91.17 10.240.33.220 4h <-
> Ambari server
> y2-2.c.pramod-thangali.internal 104.196.90.52 10.240.67.205 4h
> y2-3.c.pramod-thangali.internal 104.196.82.69 10.240.90.190 4h
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