Allow trusted brokers to restrict connections for spawned applications to whitelisted applications …

mojo/shell/application_instance.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef MOJO_SHELL_APPLICATION_INSTANCE_H_
 #define MOJO_SHELL_APPLICATION_INSTANCE_H_
 
+#include <set>
+
 #include "base/callback.h"
 #include "mojo/application/public/interfaces/application.mojom.h"
 #include "mojo/application/public/interfaces/shell.mojom.h"
 #include "mojo/public/cpp/bindings/binding.h"
 #include "mojo/shell/identity.h"
 #include "url/gurl.h"
 
 namespace mojo {
+
+// TODO(beng): upstream this into mojo repo, array.h so it can be shared with
+//             application_impl.cc.
+// A |TypeConverter| that will create an |std::set<E>| containing a copy of
+// the contents of an |Array<T>|, using |TypeConverter<E, T>| to copy each
+// element. If the input array is null, the output set will be empty.
+template <typename E, typename T>
+struct TypeConverter <std::set<E>, Array<T>> {
+  static std::set<E> Convert(const Array<T>& input) {
+    std::set<E> result;
+    if (!input.is_null()) {
+      for (size_t i = 0; i < input.size(); ++i)
+        result.insert(TypeConverter<E, T>::Convert(input[i]));
+    }
+    return result;
+  }
+};
+
+template <typename T, typename E>
+struct TypeConverter <Array<T>, std::set<E>> {
+  static Array<T> Convert(const std::set<E>& input) {
+    Array<T> result(0u);
+    for (auto i : input)
+      result.push_back(TypeConverter<T, E>::Convert(i));
+    return result.Pass();
+  }
+};
+
 namespace shell {
 
 class ApplicationManager;
 
 // Encapsulates a connection to an instance of an application, tracked by the
 // shell's ApplicationManager.
-// TODO(beng): Currently this provides a default implementation of the Shell
-//             interface. This should be moved into a separate class RootShell
-//             which is instantiated when no other Shell implementation is
-//             provided via ConnectToApplication().
 class ApplicationInstance : public Shell {
  public:
+  using AllowedInterfaces = std::set<std::string>;
+  using CapabilityFilter = std::map<std::string, AllowedInterfaces>;
+
   ApplicationInstance(ApplicationPtr application,
                       ApplicationManager* manager,
                       const Identity& resolved_identity,
+                      const CapabilityFilter& filter,
                       const base::Closure& on_application_end);
 
   ~ApplicationInstance() override;
 
   void InitializeApplication();
 
-  void ConnectToClient(const GURL& requested_url,
+  void ConnectToClient(ApplicationInstance* originator,
+                       const GURL& requested_url,
                        const GURL& requestor_url,
                        InterfaceRequest<ServiceProvider> services,
-                       ServiceProviderPtr exposed_services);
+                       ServiceProviderPtr exposed_services,
+                       CapabilityFilterPtr filter);
+
+  // Returns the set of interfaces this application instance is allowed to see
+  // from an instance with |identity|.
+  AllowedInterfaces GetAllowedInterfaces(const Identity& identity) const;
 
   Application* application() { return application_.get(); }
   const Identity& identity() const { return identity_; }
   base::Closure on_application_end() const { return on_application_end_; }
 
  private:
   // Shell implementation:
-  void ConnectToApplication(mojo::URLRequestPtr app_request,
+  void ConnectToApplication(URLRequestPtr app_request,
                             InterfaceRequest<ServiceProvider> services,
-                            ServiceProviderPtr exposed_services) override;
+                            ServiceProviderPtr exposed_services,
+                            CapabilityFilterPtr filter) override;
   void QuitApplication() override;
 
+  void CallAcceptConnection(ApplicationInstance* originator,
+                            const GURL& url,
+                            InterfaceRequest<ServiceProvider> services,
+                            ServiceProviderPtr exposed_services,
+                            const GURL& requested_url);
+
   void OnConnectionError();
 
   void OnQuitRequestedResult(bool can_quit);
 
   struct QueuedClientRequest {
     QueuedClientRequest();
     ~QueuedClientRequest();
+    ApplicationInstance* originator;
     GURL requested_url;
     GURL requestor_url;
     InterfaceRequest<ServiceProvider> services;
     ServiceProviderPtr exposed_services;
+    CapabilityFilterPtr filter;
   };
 
   ApplicationManager* const manager_;
   const Identity identity_;
+  const CapabilityFilter filter_;
+  const bool allow_any_application_;
   base::Closure on_application_end_;
   ApplicationPtr application_;
   Binding<Shell> binding_;
   bool queue_requests_;
   std::vector<QueuedClientRequest*> queued_client_requests_;
 
   DISALLOW_COPY_AND_ASSIGN(ApplicationInstance);
 };
 
 }  // namespace shell
 }  // namespace mojo
 
 #endif  // MOJO_SHELL_APPLICATION_INSTANCE_H_