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What advantages are there between implementing SOAP messages over SSL by modifying the web.xml/ejb-jar.xml VS modifying the WSDL with a WS-Policy?
Our project can acheive its goal of having our clients (ourselves) access the Web Service over a secured connection by adding a transport-guarantee but we’re not sure if that is a complete/correct solution.
With SSL, you get a point-to-point encryption between client and service. If the service is not the ultimate receipient of the message, but a proxy that routes this message to another service, you have no encryption between the two services, or you have to configure that also.
WS-Security configured via WS-Policy has the potential to give you end-to-end encryption between the client and the ultimate receipient of the message, because you can encrypt the message body. You do not need to configure SSL for every pair of communicating entities. Every proxy can just route the message on, as defined in the header.
That said, if you do not need end-to-end guarantees, but point-to-point is enough (which is your scenario, as far as I understand), I would say that using SSL is a fair choice.
Another thing to consider is that the WS-Security implementations of client and service need to be able to interoperate. SSL generally is quite mature, but my personal experience is that WS-Security implementations are not. So, if you have different WS-* Stacks for client and server, it might be some hacking and trial-and-error to find a policy configuration that works for both.