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https://issues.apache.org/jira/browse/YARN-4006?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15297342#comment-15297342
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Larry McCay commented on YARN-4006:
-----------------------------------
Like I said, we need to extract the implementation of the interrogation of the
config and creation into a common facility to populate the filterConfig.
Anywhere that filter integration is affected by that config needs to be done
the same way. If anything were to change in what "kerberos" means in terms of
filter is currently going to have to be changed in too many places.
Let's get a common builder class and figure out how it needs to be changed to
accommodate the one-offs.
bq. . We're playing around with some ideas to see if the problem is actually
deeper given that even using Kerberos with AltKerberos doesn't work.
This seems intuitive to me. If the authentication type is currently set to a
classname (for custom handler) and it doesn't match simple or kerberos then it
gives nothing.
I am still a bit confused about the statement earlier that existing AltKerberos
extensions will need to change to super() up for management calls. Without any
details about that in the patch I think that we should either:
1. file a separate issue for AltKerberos changes - which is likely to be
incompatible (undesirable)
2. assume that such super() up changes are only needed in the specific
AltKerberos impl and maintain backward compatibility for everything already in
the wild - may require a separate change to AltKerberos to expose the methods
to super up to. (desirable)
> YARN ATS Alternate Kerberos HTTP Authentication Changes
> -------------------------------------------------------
>
> Key: YARN-4006
> URL: https://issues.apache.org/jira/browse/YARN-4006
> Project: Hadoop YARN
> Issue Type: Improvement
> Components: security, timelineserver
> Affects Versions: 2.5.0, 2.6.0, 2.7.0, 2.5.1, 2.6.1, 2.8.0, 2.7.1, 2.7.2
> Reporter: Greg Senia
> Assignee: Greg Senia
> Priority: Blocker
> Attachments: YARN-4006-branch-trunk.patch,
> YARN-4006-branch2.6.0.patch, sample-ats-alt-auth.patch
>
>
> When attempting to use The Hadoop Alternate Authentication Classes. They do
> not exactly work with what was built with YARN-1935.
> I went ahead and made the following changes to support using a Custom
> AltKerberos DelegationToken custom class.
> Changes to: TimelineAuthenticationFilterInitializer.class
> {code}
> String authType = filterConfig.get(AuthenticationFilter.AUTH_TYPE);
> LOG.info("AuthType Configured: "+authType);
> if (authType.equals(PseudoAuthenticationHandler.TYPE)) {
> filterConfig.put(AuthenticationFilter.AUTH_TYPE,
> PseudoDelegationTokenAuthenticationHandler.class.getName());
> LOG.info("AuthType: PseudoDelegationTokenAuthenticationHandler");
> } else if (authType.equals(KerberosAuthenticationHandler.TYPE) ||
> (UserGroupInformation.isSecurityEnabled() &&
> conf.get("hadoop.security.authentication").equals(KerberosAuthenticationHandler.TYPE)))
> {
> if (!(authType.equals(KerberosAuthenticationHandler.TYPE))) {
> filterConfig.put(AuthenticationFilter.AUTH_TYPE,
> authType);
> LOG.info("AuthType: "+authType);
> } else {
> filterConfig.put(AuthenticationFilter.AUTH_TYPE,
> KerberosDelegationTokenAuthenticationHandler.class.getName());
> LOG.info("AuthType: KerberosDelegationTokenAuthenticationHandler");
> }
> // Resolve _HOST into bind address
> String bindAddress = conf.get(HttpServer2.BIND_ADDRESS);
> String principal =
> filterConfig.get(KerberosAuthenticationHandler.PRINCIPAL);
> if (principal != null) {
> try {
> principal = SecurityUtil.getServerPrincipal(principal, bindAddress);
> } catch (IOException ex) {
> throw new RuntimeException(
> "Could not resolve Kerberos principal name: " + ex.toString(),
> ex);
> }
> filterConfig.put(KerberosAuthenticationHandler.PRINCIPAL,
> principal);
> }
> }
> {code}
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