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https://issues.apache.org/jira/browse/CASSANDRA-18778?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17757653#comment-17757653
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Andy Tolbert commented on CASSANDRA-18778:
------------------------------------------

My understanding of [CASSANDRA-18124] was that it was oriented towards allowing 
{{keystore_password}} to be nullable for the 
{{PEMBasedSslContextFactory}}-based implementation to allow null/empty 
passwords, which it previously didn't.  A side effect of this change was also 
that the default {{FileBasedSslContextFactory}} was changed to additionally 
validate the password to ensure it was non-null/empty[1].   This validation did 
not previously exist, and since {{KeyStore}} does allow empty passwords, this 
could be a regression for someone upgrading from 4.0 to 4.1.2+ where empty 
password PKCS12 keystores were used.  It's probably not a common use case, but 
was something I encountered myself during testing.

[1]: 
https://github.com/apache/cassandra/commit/bd49f6ff265c8bfa64bf140328ae6736dc4a87bd#diff-559a53285872c51f496ae3319425977f741ae2f3a359c2da674403294e17297e

> Empty keystore_password no longer allowed on encryption_options
> ---------------------------------------------------------------
>
>                 Key: CASSANDRA-18778
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-18778
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Local/Config
>            Reporter: Andy Tolbert
>            Assignee: Andy Tolbert
>            Priority: Normal
>             Fix For: 4.1.x, 5.0.x
>
>
> After CASSANDRA-18124 (introduced in 4.1.2 and 5.0) it is no longer possible 
> to set an empty {{keystore_password}} under {{client_encryption_options}} or 
> {{server_encryption_options}} using the default implementation 
> {{{}DefaultSslContextFactory{}}}.
> While keytool does not allow generating keystores with empty passwords, it 
> does support reading them. It is not uncommon to use PKCS12 certificates 
> generated by other tools (eg. openssl) that do not enforce passwords.
> The fix for this should be pretty straightforward, which should involve 
> changing 
> [FileBasedSslContextFactory.validatePassword|https://github.com/apache/cassandra/blob/cassandra-4.1.2/src/java/org/apache/cassandra/security/FileBasedSslContextFactory.java#L128-L135]
>  to only disallow null passwords (which would be consistent with previous 
> versions). I will create pull requests against the relevant branches shortly.
> {noformat}
> Exception (org.apache.cassandra.exceptions.ConfigurationException) 
> encountered during startup: Failed to initialize SSL
> org.apache.cassandra.exceptions.ConfigurationException: Failed to initialize 
> SSL
>       at 
> org.apache.cassandra.config.DatabaseDescriptor.applySslContext(DatabaseDescriptor.java:1155)
>       at 
> org.apache.cassandra.config.DatabaseDescriptor.applyAll(DatabaseDescriptor.java:390)
>       at 
> org.apache.cassandra.config.DatabaseDescriptor.daemonInitialization(DatabaseDescriptor.java:204)
>       at 
> org.apache.cassandra.config.DatabaseDescriptor.daemonInitialization(DatabaseDescriptor.java:188)
>       at 
> org.apache.cassandra.service.CassandraDaemon.applyConfig(CassandraDaemon.java:804)
>       at 
> org.apache.cassandra.service.CassandraDaemon.activate(CassandraDaemon.java:747)
>       at 
> org.apache.cassandra.service.CassandraDaemon.main(CassandraDaemon.java:875)
> Caused by: java.io.IOException: Failed to create SSL context using Native 
> transport
>       at 
> org.apache.cassandra.security.SSLFactory.validateSslContext(SSLFactory.java:405)
>       at 
> org.apache.cassandra.config.DatabaseDescriptor.applySslContext(DatabaseDescriptor.java:1150)
>       ... 6 more
> Caused by: java.lang.IllegalArgumentException: 'keystore_password' must be 
> specified
>       at 
> org.apache.cassandra.security.FileBasedSslContextFactory.validatePassword(FileBasedSslContextFactory.java:133)
>       at 
> org.apache.cassandra.security.FileBasedSslContextFactory.buildKeyManagerFactory(FileBasedSslContextFactory.java:151)
>       at 
> org.apache.cassandra.security.AbstractSslContextFactory.createNettySslContext(AbstractSslContextFactory.java:181)
>       at 
> org.apache.cassandra.security.SSLFactory.createNettySslContext(SSLFactory.java:168)
>       at 
> org.apache.cassandra.security.SSLFactory.validateSslContext(SSLFactory.java:355)
>       ... 7 more
> {noformat}



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