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Subject: Re: [xdi] A quick link contract riddle

Yes this makes sense, and with my current implementation the message would indeed succeed.

I was just asking because it feels a bit inconsistent that the link contract would allow a $get on (=a/()/*b), but not on (=a/+friend/=x).
Both statement have the same subject, i.e. they are arcs on the same context node, but still the link contract applies to one but not the other.

A similar question applies to XDI2 connectors, e.g. if I "install" a connector to handle the subgraph at =a*b, would the connector also be "in charge" of the statement (=a/()/*b) or not.

BTW I think you would agree that the link contract in the same example would NOT allow the following Message 3:



On Tue, Jul 16, 2013 at 9:58 AM, Drummond Reed <drummond.reed@xdi.org> wrote:
On Mon, Jul 15, 2013 at 11:36 AM, Markus Sabadello <markus.sabadello@xdi.org> wrote:
I thought I'd share this with the list:

Let's say we have this graph:


And this link contract in the same graph:


Now let's look at the following two messages:

Message 1:


Message 2:


Message 1 will obviously fail, because the link contract doesn't cover the requested statement.

Now my question is, will Message 2 fail or succeed? Anyone?

It should succeed. Reason: If the link contract authorizes the sender (which you didn't show any policy for) to get =a*b, then I believe it should authorize the sender to discover that =a has a subcontext *b. In otherwise, implicit context statements should be included in the authorization policy.

If it ends out being a security issue, I could see us adding a policy statement covering whether discovery of implicit statements is allowed under the link contract or not.

Is that what you are asking?


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