binder: Introduce server pre-authorization #12127
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…dentity before binding.
Parameterize RobolectricBinderSecurityTest
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grpc-binder clients authorize servers by checking the UID of the sender of the SETUP_TRANSPORT Binder transaction against some SecurityPolicy. But merely binding to an unauthorized server to learn its UID can enable "keep-alive" and "background activity launch" abuse, even if security policy ultimately causes the grpc connection to fail. Pre-authorization mitigates this kind of abuse by resolving addresses and authorizing a candidate server Application's UID before binding to it. Pre-auth is especially important when the server's address is not fixed in advance but discovered by PackageManager lookup.
Design at: go/grpc-binder-service-discovery "Mitigating Keep-Alive Attacks"