Getting started on OAuth 2.0

Sure, the OAuth 2 spec is still a draft, but so is the project we’re working on. I expect that by the time anyone is ready to talk to us, 2 will be solid enough and have enough adoption that we’ll have lots of partners to play with.

So far the questions we’re addressing are pretty basic.

  • Can we use OAuth 2 to protect web pages?

This was sort of out of the question in 1.0, but the Web Server flow is most of the way there to providing a bearer token scheme for protecting some of the admin tools we’re standing up.

  • Can we pass an access token in a cookie instead of an Authorization header?

I mean, why not? The reason cookies were invented was exactly this: to pass “magic cookies” that would let you get past the authorization troll.

  • Can we attach application-specific name value pairs to an access token?

Right now it looks like we can pass keywords in the “scope” value of a request. While that’s just a space-delimited list of keywords, nothing in the OAuth 2 spec says they can’t be name value pairs. As long as there’s no spaces in them.

In the end, we’ll probably fall this way:

Protect web pages? Yes.

Use cookies? Yes, in addition to the Authorization header and query string parameter.

Use name value pairs in “scope”? No, keywords should be enough for us.

On the last point, we may implement a second call to the Authorization Server to get more information tied to the access token than we got up front. Ya, that’s an extra hop, but right now we’re working with low-volume admin apps, so that should be OK.

Oh, and the other fun part is that we’re building an OAuth reverse proxy that sits in front of the webapp and takes care of the authorization — kind of like terminating SSL at the load balancer.

So far, pretty fun stuff.

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