How uses JAAS in Jahia?

Hello,
I am trying that jahia uses authentication JAAS, but do not know what is 
what I must do for it.
In the file jahia/WEB-INF/etc/config/jaia.properties  it specifies 
something like this:

### Authentification pipeline ##########
authPipelineFileName = /WEB-INF/etc/config/auth-pipeline.xml
authPipelineClassName = org.jahia.pipelines.impl.GenericPipeline
Jahia now uses a pipeline mechanism to process user authentification, 
which allows developers to extend
the system for custom authentification back-ends.
You might want to modify the pipeline if you want to extend Jahia's 
authentification system, for example by
adding a JAASAuthValve or something else.
### Process pipeline ################
processPipelineFileName = /WEB-INF/etc/config/process-pipeline.xml
processPipelineClassName = org.jahia.pipelines.impl.GenericPipeline


But I do not know what I must do exactly.
Somebody can say the steps to me that I must give?

Thank you very much in advance.

Jaime.