[jira] [Created] (KUDU-2265) A non-leader master uses self-signed server TLS cert if it hasn't ever run as a leader

["Alexey Serbin (JIRA)" <ji...@apache.org>]

Alexey Serbin created KUDU-2265:
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             Summary: A non-leader master uses self-signed server TLS cert if it hasn't ever run as a leader
                 Key: KUDU-2265
                 URL: https://issues.apache.org/jira/browse/KUDU-2265
             Project: Kudu
          Issue Type: Improvement
          Components: master, security
    Affects Versions: 1.50, 1.6.0, 1.4.0, 1.3.1, 1.3.0
            Reporter: Alexey Serbin


As it's currently implemented, master process replaces its auto-generated self-signed server TLS certificate with CA-signed one only when it becomes a leader (see {{{color:#333333}CatalogManager::InitCertAuthorityWith(){color}}} method; it's invoked only from \{{CatalogManager::InitCertAuthority()}}, that is invoked only from \{{CatalogManager::PrepareForLeadershipTask()}}).

 

In case of just one Raft election from the start (which is pretty common, BTW), non-leader masters run without CA-signed server certificate for a long time in case of a multi-master configuration.  That causes clients to not use their authn tokens for authentication while connecting to those non-leader masters.  In case of Spark applications where executors do not have Kerberos credentials (the common case), application logs are polluted with messages like below:
{noformat}
org.apache.kudu.client.NonRecoverableException: Server requires Kerberos, but this client is not authenticated (kinit)
  at org.apache.kudu.client.Negotiator.evaluateChallenge(Negotiator.java:705)
  at org.apache.kudu.client.Negotiator.sendSaslInitiate(Negotiator.java:581)

...

Caused by: javax.security.sasl.SaslException: GSS initiate failed [Caused by GSSException: No valid credentials provided (Mechanism level: Failed to find any Kerberos tgt)]
  at com.sun.security.sasl.gsskerb.GssKrb5Client.evaluateChallenge(GssKrb5Client.java:211){noformat}



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