# Prebuilt Authentication Modules

TIBCO Enterprise Message Service includes several supported JAAS authentication modules that offer flexible authentication for the EMS server. The source files of the prebuilt modules are provided in `EMS_HOME/src/java/jaas`, and provide an excellent template for developing custom modules. Multiple instances of any prebuilt JAAS module can be used in any stacked combination to suit the authentication requirements of your environment.

These modules are described in JAAS Authentication Modules.

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