[GitHub] [qpid-dispatch] ChugR opened a new pull request #540: DISPATCH-1388: Clarify policy restrictions defined by vhost objects

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ChugR opened a new pull request #540: DISPATCH-1388: Clarify policy restrictions defined by vhost objects
URL: https://github.com/apache/qpid-dispatch/pull/540
 
 
   State more clearly that policy restrictions are applied to client requests
   at network ingress only.
   
   As I read the document now it is unclear if a policy restriction defined
   by a vhost would be applied to a request originated at a distant point in
   the network. Suppose I have two vhosts, vhost1 and vhost2, and two users,
   Alice and Bob. Vhost policy is enabled for address "orders":
   
     |"orders" | vhost1 | vhost2 |
     +---------+--------+--------+
     | Alice   | allow  | deny   |
     | Bob     | deny   | allow  |
   
   If Alice creates a receiver for "orders" on vhost1 and Bob creates a
   sender for "orders" on vhost2 then the router network will Bob's
   sender to send messages to Alice's receiver. This is allowed even though
   user Alice is denied access to that address on vhost2 and user Bob
   is denied access on vhost1.
   
   There are separate namespaces for users on each vhost. What user Alice
   does on vhost1 is unaffected by the namespace restrictions applied to
   vhost2. Alice's identity is not propagated to vhost2 for subsequent
   authorization checks.

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