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20 Apr 2015
by cvringer

Securing Milton Webdav with JAAS

I was working on our Document Management System, playing around with another webdav possibility. Our DMS uses JackRabbit for webdav.

Although it has been working fine for about 6 years now, it’s been causing a lot of overhead. So i looked into Milton (http://milton.io) which should be a nice lightweight solution. One can map it’s own model to Milton and thus enable webdav. For us, our model (in the database) is translated intro a nice webdav solution.

To get a feeling about Milton, you can download milton-anno-ref. It’s a working implementation, and runs out of the box. Note: To enable full Dav Level2 you need a (trial) license. Read more HERE.

Now, when you use Milton, you probably want to run it on Tomcat, or some application server. Maybe you already use something like JAAS. So how do you configure Milton to not use it’s own authentication mechanism, but the container managed one?

I’ll describe how you can use JAAS, and run it on Jetty, Tomcat or Glassfish.¬†Ready? Let’s go then.

First: When you downloaded and installed Milton onto your favorite IDE, you have to disable Milton’s own securitymanager. The SecurityManager is injected in the default Configurator, so we have to build our own configurator. Here’s the code:

As you can see, we disable security by injecting a NullSecurityManager into the HttpManagerBuilder. This disables any authentication and authorization. Next, we tell Milton to use this Configurator. We also configure the security element in our web.xmlThis tells the container to authenticate all requests and give access to any authenticated user with the role milton-user. An OPTIONS request is always allowed. So, if you run Milton now, the container will authenticate, and once authenticated Milton can do it’s work.

 

In our DMS, ACL is not controlled by Milton, but in the database. So the query result depends on the user and the roles and permissions that user has in the database. For every query we need to know the logged-in user (Principal). In Milton getting the Principal is easy. Annotated methods can be extended adding the Request parameter. From this request you can get the Principal. Here’s how:

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