public String getRadiusSharedSecret() throws GuacamoleException {
        return environment.getProperty(
            RadiusGuacamoleProperties.RADIUS_SHARED_SECRET
        );
    }
Returns the shared secret used to communicate with the RADIUS server,
as configured in guacamole.properties.  This must match the value
in the RADIUS server configuration.

@return
    The shared secret of the RADIUS server, as configured with
    guacamole.properties.

@throws GuacamoleException
    If guacamole.properties cannot be parsed.
extensions/guacamole-auth-radius/src/main/java/org/apache/guacamole/auth/radius/conf/ConfigurationService.java