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  1. MariaDB Server
  2. MDEV-27181

Galera SST scripts should use ssl_capath (not ssl_ca) for CA directory

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      Based on a discussion with Julius Goryavsky, the SST script changes from MDEV-26360 allow users to configure a CA directory by setting ssl_ca, like this:

      [mariadb]
      ...
      wsrep_ssl_mode = SERVER_X509
       
      ssl_ca = /certs/ca-cert/
      ssl_cert = /certs/server-cert.pem
      ssl_key = /certs/server-key.pem
      

      This implementation is likely to result in problems. ssl_ca is a system variable owned by MariaDB Server. MariaDB Server expects the ssl_ca system variable to refer to an absolute path to a single PEM file:

      ssl_ca
      Description: Defines a path to a PEM file that should contain one or more X509 certificates for trusted Certificate Authorities (CAs) to use for TLS. This system variable requires that you use the absolute path, not a relative path. This system variable implies the ssl option.

      https://mariadb.com/kb/en/ssltls-system-variables/#ssl_ca

      If a Galera user tries to set the ssl_ca system variable to a path to a directory, MariaDB Server is likely to encounter an error during startup when it tries to treat the value as a path to a PEM file.

      However, there is an easy solution. MariaDB Server provides the ssl_capath system variable to refer to a directory:

      ssl_capath
      Description: Defines a path to a directory that contains one or more PEM files that should each contain one X509 certificate for a trusted Certificate Authority (CA) to use for TLS. This system variable requires that you use the absolute path, not a relative path. The directory specified by this variable needs to be run through the openssl rehash command. This system variable implies the ssl option.

      https://mariadb.com/kb/en/ssltls-system-variables/#ssl_capath

      If we would like Galera users to be able to specify a path to a directory of CA certificates, we should probably use ssl_capath for this--not ssl_ca.

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              Assignee:
              sysprg Julius Goryavsky
              Reporter:
              GeoffMontee Geoff Montee
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