I'm trying to find a solid architecture for authenticating users against a database. I have a game client, which I plan to serve up a request with. The transport doesn't really matter, but at this point I'm thinking HTTP and leveraging either SSL or WS-Security to ensure the encryption of data over the wire.
I'd like to avoid middle-man attacks if possible so I'm leaning towards WS-Security even though I know it costs more in terms of overhead.
On the service side, I'd like to use an authentication framework such as Apache Shiro to authenticate users against a MySQL database. I'm not sure if I can leverage the session features or not, as I haven't looked that for into it, but it'd be great if I could.
It will probably be a mix of storing some session information in the database and if I can leverage Shiro's session features then that's a bonus.
My real question is about the handshake between the client and server. If I use WS-Security isn't all that taken care of for me? Does that alone make the overhead worth it?
If not, what should I do here? I want to make sure all of the requests from the client are authenticated but I also don't want to have to jump through hoops to make it happen. Would something as simple as HTTP digest authentication work here?
One constraint I have is access to libraries. If it's not free and can't be used in a commercial product then I can't leverage it. My client is going to be written in C++ and I can use whatever language makes it easiest (I'm leaning towards Java) to make it happen on the server side.
I plan on adding support for users to purchase in-game items through micropayments down the road, so this handshake mechanism definitely needs to be secure.
I keep hearing people suggest REST + SSL, and to examine Amazon's Signing and Authenticating REST Requests page. Is that a viable alternative? If I used that and something like Apache Shiro would I have a winner?
SSL is not vulnerable to MITM, unless the client machine has malicious root CA certificates installed (in which case you can't do anything at all as you might as well assume that the entire client is compromised). If you get a certificate from a proper CA like Verisign you will be assured that any communications with your server will be secure (except in academic situations like quantum computing). If you use an encrypted channel during the authentication phase you can use whatever serialization/communication paradigm you want (REST, Protobuf, etc.).
In other words all you need to do at the end of the day is make sure that the passwords are salted and hashed in your DB, preferably double-salted so that your client 'remember password' functionality can store a salted hash on the hard-drive; instead of a clear-text password.
Alternatively you could look into:
WS-Security is primarily geared toward federated services, i.e. cross-enterprise, (as are most of the WS-I extensions) - which is probably not a concern for you. At any rate the WS-Security has the associated overhead of SOAP (and the underlying frameworks/marshalling needed to handle SOAP calls). SOAP is a very heavy protocol and is probably an very poor choice for game development. I would avoid this entirely.
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