AWS Glue now provides ability to use custom certificates for JDBC Connections
Starting today, you can now use custom certificates in AWS Glue when using JDBC connections to connect to your data sources from Glue ETL jobs and crawlers. You may decide to use custom certificates because you already obtained a certificate from a third-party issuer, or because the default certificates supported by AWS Glue do not meet your requirements. Previously, you were only able to use the default certificates supported by AWS Glue.
Source:: Amazon AWS