token-server: Delegation config import, validation and evaluation.

tokenserver/api/admin/v1/config.proto

 // Copyright 2016 The LUCI Authors. All rights reserved.
 // Use of this source code is governed under the Apache License, Version 2.0
 // that can be found in the LICENSE file.
 
 syntax = "proto3";
 
 package tokenserver.admin;
 
 
 // TokenServerConfig is read from tokenserver.cfg in luci-config.
@@ skipping 96 matching lines @@
   // to some target audience.
   repeated string allowed_to_impersonate = 4;
 
   // A set of identities that should be able to use the new token.
   //
   // Each element is either:
   //  * An identity string ("user:<email>").
   //  * A group reference ("group:<name>").
   //  * A special identifier "REQUESTOR" that is substituted by the requestor
   //    identity when evaluating the rule.
+  //  * A special token "*" that means "any bearer can use the new token,
+  //    including anonymous".
   //
   // "REQUESTOR" is typically used here for rules that allow requestors to
   // impersonate someone else. The corresponding tokens have the requestor as
   // the only allowed audience.
   repeated string allowed_audience = 5;
 
   // A set of services that should be able to accept the new token.
   //
-  // Each element is a service identity string ("service:<id>").
+  // Each element is either:
+  //  * A service identity string ("service:<id>").
+  //  * A special token "*" that mean "any LUCI service should accept the

[nodir, 2016/10/13 22:03:52]

means

+  //    token".
   repeated string target_service = 6;
 
   // Maximum allowed validity duration (sec) of minted delegation tokens.
   //
   // Default is 12 hours.
   int64 max_validity_duration = 7;
 }