Ensure mutual TLS is enabled

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Description

Mutual TLS (a.k.a. Two-Way TLS) enhances TLS by requiring that both parties authenticate each other when establishing a connection. Mutual TLS adds a requirement (over TLS) that the client provide its certificate so the server can authenticate the client.

How it is checked

Audit method: Manual review

This recommendation cannot be checked automatically. A scan lists it with these instructions when you pass --include-manual.

If replication uses TLS, run SHOW REPLICA STATUS\G on the replica and verify Master_SSL_Cert and Master_SSL_Key name the replica's certificate and key; on the primary verify the replication account requires a certificate (SELECT user, host, ssl_type FROM mysql.user WHERE Repl_slave_priv = 'Y'; ssl_type X509 or SPECIFIED).

How it is fixed

Fix method: Guidance or infrastructure patch

On the replica: CHANGE MASTER TO MASTER_SSL_CERT = '<cert>', MASTER_SSL_KEY = '<key>', MASTER_SSL_CA = '<ca>'; on the primary: ALTER USER '<repl>'@'<host>' REQUIRE X509;

Properties

Operating systems: Any
Tags: mariadbdatabasereplicationtlsmanual
Reference: CIS MariaDB 10.11 Benchmark v1.0.0 - 9.5 Ensure mutual TLS is enabled