public File getPostgreSQLSSLClientCertFile() throws GuacamoleException {
        return getProperty(PostgreSQLGuacamoleProperties.POSTGRESQL_SSL_CERT_FILE);
    }
Return the SSL client certificate file to use to make the connection
to the PostgreSQL server.

@return
    The SSL client certificate file to use for the PostgreSQL connection.

@throws GuacamoleException
    If an error occurs retrieving the value from guacamole.properties.
extensions/guacamole-auth-jdbc/modules/guacamole-auth-jdbc-postgresql/src/main/java/org/apache/guacamole/auth/postgresql/conf/PostgreSQLEnvironment.java