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https://issues.apache.org/jira/browse/HADOOP-16214?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16837418#comment-16837418
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Daryn Sharp commented on HADOOP-16214:
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{quote}This is only benefits his own proposal of using auth_to_local as
firewall rules to prevent unauthorized users from getting into secure cluster.
This is not retaining backward compatibility, but benefit for his own agenda.
{quote}
{quote}Please do not conflating authentication with authorization. Your
proposal of using auth_to_local as firewall rule is trying to block anonymous
from gain access to the system during authentication phase.
{quote}
The auth_to_local rules are and always have served as a whitelist for
authorization. Rejecting your proposal to change out of scope semantics is
neither a proposal nor agenda.
As an example of practicality to others, would an admin prefer:
# Define a few auth_to_local rules to whitelist principals (in this case to
enforce principals containing the authorized roles). One change protects all
services.
# Define N-many ACLs for _every_ current/future service – assuming the service
even has ACL support. Remain hyper-vigilant to detect and define ACLs for every
current/future service & protocol.
The default behavior is and must remain #1. An admin may already select #2 via
an explicit wildcard rule if they wish, and bear the brunt of defining and
auditing all their services. Debating a change to these semantics is out of
scope for this jira.
> Kerberos name implementation in Hadoop does not accept principals with more
> than two components
> -----------------------------------------------------------------------------------------------
>
> Key: HADOOP-16214
> URL: https://issues.apache.org/jira/browse/HADOOP-16214
> Project: Hadoop Common
> Issue Type: Bug
> Components: auth
> Reporter: Issac Buenrostro
> Priority: Major
> Attachments: Add-service-freeipa.png, HADOOP-16214.001.patch,
> HADOOP-16214.002.patch, HADOOP-16214.003.patch, HADOOP-16214.004.patch,
> HADOOP-16214.005.patch, HADOOP-16214.006.patch, HADOOP-16214.007.patch,
> HADOOP-16214.008.patch, HADOOP-16214.009.patch, HADOOP-16214.010.patch,
> HADOOP-16214.011.patch, HADOOP-16214.012.patch, HADOOP-16214.013.patch
>
>
> org.apache.hadoop.security.authentication.util.KerberosName is in charge of
> converting a Kerberos principal to a user name in Hadoop for all of the
> services requiring authentication.
> Although the Kerberos spec
> ([https://web.mit.edu/kerberos/krb5-1.5/krb5-1.5.4/doc/krb5-user/What-is-a-Kerberos-Principal_003f.html])
> allows for an arbitrary number of components in the principal, the Hadoop
> implementation will throw a "Malformed Kerberos name:" error if the principal
> has more than two components (because the regex can only read serviceName and
> hostName).
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