Comments - Getting Started with MariaDB Galera Cluster
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You don't really need "full access". If you search around you'll see what permissions you need on the databases. First of all you create a specific user for SST transfers, than you give permission 640 to your /etc/my.cnf.d/server.cnf file, and assign it to mysql:mysql. At the end if you liked this explanaton, you can configure your cluster by using my tool: https://github.com/maxadamo/galera-wizard
p.s.: of course you can also implemente SSL for your replication....
Cheers.