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https://issues.apache.org/jira/browse/CASSANDRA-13428?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17867181#comment-17867181
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Maulin Vasavada commented on CASSANDRA-13428:
---------------------------------------------

After re-looking at the patch for CASSANDRA-18508 and my above thinking, I am 
exactly sure what needs to be done. What I mentioned above should work. 

> Security: provide keystore_password_file and truststore_password_file options
> -----------------------------------------------------------------------------
>
>                 Key: CASSANDRA-13428
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-13428
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Feature/Encryption, Local/Config
>            Reporter: Bas van Dijk
>            Assignee: Maulin Vasavada
>            Priority: Normal
>   Original Estimate: 3h
>  Remaining Estimate: 3h
>
> Currently passwords are stored in plaintext in the configuration file as in:
> {code}
>     server_encryption_options:
>       keystore_password: secret
>       truststore_password: secret
>     client_encryption_options:
>       keystore_password: secret
> {code}
> This has the disadvantage that, in order to protect the secrets, the whole 
> configuration file needs to have restricted ownership and permissions. This 
> is problematic in operating systems like NixOS where configuration files are 
> usually stored in world-readable locations.
> A secure option would be to store secrets in files (with restricted ownership 
> and permissions) and reference those files from the unrestricted 
> configuration file as in for example:
> {code}
>     server_encryption_options:
>       keystore_password_file: /run/keys/keystore-password
>       truststore_password_file: /run/keys/truststore-password
>     client_encryption_options:
>       keystore_password_file: /run/keys/keystore-password
> {code}
> This is trivial to implement and provides a big gain in security.
> So in summary I'm proposing to add the {{keystore_password_file}} and 
> {{truststore_password_file}} options besides the existing 
> {{keystore_password}} and {{truststore_password options}}. The former will 
> take precedence over the latter.



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