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

mojo/shell/capability_filter_unittest.cc

+// 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.
+
+#include "base/at_exit.h"
+#include "base/bind.h"
+#include "base/macros.h"
+#include "base/message_loop/message_loop.h"
+#include "base/strings/stringprintf.h"
+#include "mojo/application/public/cpp/application_connection.h"
+#include "mojo/application/public/cpp/application_delegate.h"
+#include "mojo/application/public/cpp/application_impl.h"
+#include "mojo/application/public/cpp/connect.h"
+#include "mojo/application/public/cpp/interface_factory.h"
+#include "mojo/common/weak_binding_set.h"
+#include "mojo/public/cpp/bindings/strong_binding.h"
+#include "mojo/shell/application_loader.h"
+#include "mojo/shell/application_manager.h"
+#include "mojo/shell/capability_filter_unittest.mojom.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace mojo {
+namespace shell {
+namespace {
+
+// Listens for services exposed/blocked and for application connections being
+// closed. Quits |loop| when all expectations are met.
+class ConnectionValidator {
+ public:
+  ConnectionValidator(const std::set<std::string>& expectations,
+                      base::MessageLoop* loop)
+      : expectations_(expectations),
+        loop_(loop) {}
+  ~ConnectionValidator() {}
+
+  void AddServiceCalled(const std::string& app_url,
+                        const std::string& service_url,
+                        const std::string& name,
+                        bool blocked) {
+    Validate(base::StringPrintf("%s %s %s %s",
+        blocked ? "B" : "E", app_url.c_str(), service_url.c_str(),
+        name.c_str()));
+  }
+
+  void ConnectionClosed(const std::string& app_url,
+                        const std::string& service_url) {
+    Validate(base::StringPrintf("C %s %s", app_url.c_str(),
+                                service_url.c_str()));
+  }
+
+  bool expectations_met() { return expectations_.empty(); }
+
+ private:
+  void Validate(const std::string& result) {
+    DVLOG(1) << "Validate: " << result;
+    auto i = expectations_.find(result);
+    if (i != expectations_.end()) {
+      expectations_.erase(i);
+      if (expectations_.empty())
+        loop_->Quit();
+    } else {
+      DVLOG(1) << "Unexpected result.";
+      loop_->Quit();
+    }
+  }
+
+  std::set<std::string> expectations_;
+  base::MessageLoop* loop_;
+
+  DISALLOW_COPY_AND_ASSIGN(ConnectionValidator);
+};
+
+// This class models an application who will use the shell to interact with a
+// system service. The shell may limit this application's visibility of the full
+// set of interfaces exposed by that service.
+class TestApplication : public ApplicationDelegate,
+                        public ApplicationLoader,
+                        public InterfaceFactory<Client>,
+                        public Client {
+ public:
+  TestApplication(ConnectionValidator* validator,
+                  bool connect_to_test_service_2)
+      : validator_(validator),
+        connect_to_test_service_2_(connect_to_test_service_2) {}
+  ~TestApplication() override {}
+
+ private:
+  // Overridden from ApplicationDelegate:
+  bool ConfigureIncomingConnection(ApplicationConnection*) override {
+    URLRequestPtr request(URLRequest::New());
+    request->url = String::From("test:service");
+    ApplicationConnection* connection =
+        app_->ConnectToApplication(request.Pass());
+    connection->SetRemoteServiceProviderConnectionErrorHandler(
+        base::Bind(&TestApplication::Connection1Closed,
+                   base::Unretained(this)));
+
+    if (connect_to_test_service_2_) {
+      URLRequestPtr request2(URLRequest::New());
+      request2->url = String::From("test:service2");
+      ApplicationConnection* connection2 =
+          app_->ConnectToApplication(request2.Pass());
+      connection2->SetRemoteServiceProviderConnectionErrorHandler(
+          base::Bind(&TestApplication::Connection2Closed,
+                     base::Unretained(this)));
+    }
+    return true;
+  }
+  bool ConfigureOutgoingConnection(ApplicationConnection* connection) override {
+    connection->AddService<Client>(this);
+    return true;
+  }
+
+  // Overridden from ApplicationLoader:
+  void Load(const GURL& url, InterfaceRequest<Application> request) override {
+    app_.reset(new ApplicationImpl(this, request.Pass()));
+  }
+
+  // Overridden from InterfaceFactory<Client>:
+  void Create(ApplicationConnection* connection,
+              InterfaceRequest<Client> request) override {
+    client_bindings_.AddBinding(this, request.Pass());
+  }
+
+  // Overridden from Client:
+  void AddServiceCalled(const String& app_url,
+                        const String& service_url,
+                        const String& name,
+                        bool blocked) override {
+    validator_->AddServiceCalled(app_url, service_url, name, blocked);
+  }
+
+  void Connection1Closed() {
+    validator_->ConnectionClosed(app_->url(), "test:service");
+  }
+
+  void Connection2Closed() {
+    validator_->ConnectionClosed(app_->url(), "test:service2");
+  }
+
+  ConnectionValidator* validator_;
+  bool connect_to_test_service_2_;
+  scoped_ptr<ApplicationImpl> app_;
+  WeakBindingSet<Client> client_bindings_;
+
+  DISALLOW_COPY_AND_ASSIGN(TestApplication);
+};
+
+// This class models a system service that exposes two interfaces, Safe and
+// Unsafe. The interface Unsafe is not to be exposed to untrusted applications.
+class ServiceApplication : public ApplicationDelegate,
+                           public ApplicationLoader,
+                           public InterfaceFactory<Safe>,
+                           public InterfaceFactory<Unsafe>,
+                           public Safe,
+                           public Unsafe {
+ public:
+  ServiceApplication() {}
+  ~ServiceApplication() override {}
+
+ private:
+  // Overridden from ApplicationDelegate:
+  bool ConfigureIncomingConnection(ApplicationConnection* connection) override {
+    connection->ConnectToService(&client_);
+    AddService<Safe>(connection);
+    AddService<Unsafe>(connection);
+    return true;
+  }
+
+  // Overridden from ApplicationLoader:
+  void Load(const GURL& url,
+            InterfaceRequest<Application> application_request) override {
+    app_.reset(new ApplicationImpl(this, application_request.Pass()));
+  }
+
+  // Overridden from InterfaceFactory<Safe>:
+  void Create(ApplicationConnection* connection,
+              InterfaceRequest<Safe> request) override {
+    safe_bindings_.AddBinding(this, request.Pass());
+  }
+
+  // Overridden from InterfaceFactory<Unsafe>:
+  void Create(ApplicationConnection* connection,
+              InterfaceRequest<Unsafe> request) override {
+    unsafe_bindings_.AddBinding(this, request.Pass());
+  }
+
+  template <typename Interface>
+  void AddService(ApplicationConnection* connection) {
+    client_->AddServiceCalled(connection->GetRemoteApplicationURL(),
+                              connection->GetConnectionURL(),
+                              Interface::Name_,
+                              !connection->AddService<Interface>(this));
+  }
+
+  scoped_ptr<ApplicationImpl> app_;
+  ClientPtr client_;
+  WeakBindingSet<Safe> safe_bindings_;
+  WeakBindingSet<Unsafe> unsafe_bindings_;
+
+  DISALLOW_COPY_AND_ASSIGN(ServiceApplication);
+};
+
+class TestApplicationManagerDelegate : public ApplicationManager::Delegate {
+ public:
+   TestApplicationManagerDelegate() {}
+   ~TestApplicationManagerDelegate() override {}
+
+ private:
+  // Overridden from ApplicationManager::Delegate:
+  GURL ResolveMappings(const GURL& url) override {
+    return url;
+  }
+  GURL ResolveMojoURL(const GURL& url) override {
+    return url;
+  }
+  bool CreateFetcher(const GURL& url,
+                     const Fetcher::FetchCallback& loader_callback) override {
+    return false;
+  }
+
+  DISALLOW_COPY_AND_ASSIGN(TestApplicationManagerDelegate);
+};
+
+class CapabilityFilterTest : public testing::Test {
+ public:
+   CapabilityFilterTest() {}
+   ~CapabilityFilterTest() override {}
+
+ protected:
+  void RunApplication(const std::string& url, CapabilityFilterPtr filter) {
+    ServiceProviderPtr services;
+    URLRequestPtr request(URLRequest::New());
+    request->url = String::From(url);
+    application_manager_->ConnectToApplication(
+        nullptr, request.Pass(), std::string(), GURL(), GetProxy(&services),
+        nullptr, filter.Pass(), base::MessageLoop::QuitWhenIdleClosure());
+  }
+
+  base::MessageLoop* loop() { return &loop_;  }
+  ApplicationManager* application_manager() {
+    return application_manager_.get();
+  }
+
+ private:
+  // Overridden from testing::Test:
+  void SetUp() override {
+    application_manager_.reset(new ApplicationManager(&test_delegate_));
+  }
+  void TearDown() override {
+    application_manager_.reset();
+  }
+
+  base::ShadowingAtExitManager at_exit_;
+  TestApplicationManagerDelegate test_delegate_;
+  base::MessageLoop loop_;
+  scoped_ptr<ApplicationManager> application_manager_;
+
+  DISALLOW_COPY_AND_ASSIGN(CapabilityFilterTest);
+};
+
+TEST_F(CapabilityFilterTest, Blocking) {
+  std::set<std::string> expectations;
+  expectations.insert("E test:trusted test:service mojo::shell::Safe");
+  expectations.insert("E test:trusted test:service mojo::shell::Unsafe");
+  expectations.insert("E test:trusted test:service2 mojo::shell::Safe");
+  expectations.insert("E test:trusted test:service2 mojo::shell::Unsafe");
+  expectations.insert("E test:untrusted test:service mojo::shell::Safe");
+  expectations.insert("B test:untrusted test:service mojo::shell::Unsafe");
+  expectations.insert("C test:untrusted test:service2");
+
+  ConnectionValidator validator(expectations, loop());
+  application_manager()->SetLoaderForURL(
+      make_scoped_ptr(new TestApplication(&validator, true)),
+      GURL("test:trusted"));
+  application_manager()->SetLoaderForURL(
+      make_scoped_ptr(new TestApplication(&validator, true)),
+      GURL("test:untrusted"));
+  application_manager()->SetLoaderForURL(
+      make_scoped_ptr(new ServiceApplication), GURL("test:service"));
+  application_manager()->SetLoaderForURL(
+      make_scoped_ptr(new ServiceApplication), GURL("test:service2"));
+
+  Array<String> interfaces(Array<String>::New(1));
+  interfaces[0] = String::From(std::string(Safe::Name_));
+  CapabilityFilterPtr filter(CapabilityFilter::New());
+  filter->filter.insert("test:service", interfaces.Pass());
+
+  // This first application can only connect to test:service. Connections to
+  // test:service2 will be blocked. It also will only be able to see the "Safe"
+  // interface exposed by test:service. It will be blocked from seeing "Unsafe".
+  RunApplication("test:untrusted", filter.Pass());
+
+  // This second application can connect to both test:service and test:service2.
+  // It can connect to both "Safe" and "Unsafe" interfaces.
+  RunApplication("test:trusted", nullptr);
+
+  loop()->Run();
+
+  EXPECT_TRUE(validator.expectations_met());
+}
+
+TEST_F(CapabilityFilterTest, Wildcards) {
+  std::set<std::string> expectations;
+  expectations.insert("E test:wildcard test:service mojo::shell::Safe");
+  expectations.insert("E test:wildcard test:service mojo::shell::Unsafe");
+  expectations.insert("C test:blocked test:service");
+  expectations.insert("B test:wildcard2 test:service mojo::shell::Safe");
+  expectations.insert("B test:wildcard2 test:service mojo::shell::Unsafe");
+  expectations.insert("B test:wildcard2 test:service2 mojo::shell::Safe");
+  expectations.insert("B test:wildcard2 test:service2 mojo::shell::Unsafe");
+  expectations.insert("E test:wildcard3 test:service mojo::shell::Safe");
+  expectations.insert("E test:wildcard3 test:service mojo::shell::Unsafe");
+  expectations.insert("E test:wildcard3 test:service2 mojo::shell::Safe");
+  expectations.insert("B test:wildcard3 test:service2 mojo::shell::Unsafe");
+
+  ConnectionValidator validator(expectations, loop());
+  application_manager()->SetLoaderForURL(
+      make_scoped_ptr(new TestApplication(&validator, false)),
+      GURL("test:wildcard"));
+  application_manager()->SetLoaderForURL(
+      make_scoped_ptr(new TestApplication(&validator, false)),
+      GURL("test:blocked"));
+  application_manager()->SetLoaderForURL(
+      make_scoped_ptr(new TestApplication(&validator, true)),
+      GURL("test:wildcard2"));
+  application_manager()->SetLoaderForURL(
+      make_scoped_ptr(new TestApplication(&validator, true)),
+      GURL("test:wildcard3"));
+  application_manager()->SetLoaderForURL(
+      make_scoped_ptr(new ServiceApplication), GURL("test:service"));
+  application_manager()->SetLoaderForURL(
+      make_scoped_ptr(new ServiceApplication), GURL("test:service2"));
+
+  // This application is allowed to connect to any application because of a
+  // wildcard rule, and any interface exposed because of a wildcard rule in
+  // the interface array.
+  CapabilityFilterPtr filter1(CapabilityFilter::New());
+  Array<String> interfaces(Array<String>::New(1));
+  interfaces[0] = "*";
+  filter1->filter.insert("*", interfaces.Pass());
+  RunApplication("test:wildcard", filter1.Pass());
+
+  // This application is allowed to connect to no other applications because of
+  // an empty capability filter.
+  RunApplication("test:blocked", CapabilityFilter::New());
+
+  // This application is allowed to connect to any application because of a
+  // wildcard rule but may not connect to any interfaces because of an empty
+  // interface array.
+  CapabilityFilterPtr filter2(CapabilityFilter::New());
+  filter2->filter.insert("*", Array<String>::New(0));
+  RunApplication("test:wildcard2", filter2.Pass());
+
+  // This application is allowed to connect to both test:service and
+  // test:service2, and may see any interface exposed by test:service but only
+  // the Safe interface exposed by test:service2.
+  CapabilityFilterPtr filter3(CapabilityFilter::New());
+  Array<String> interfaces1(Array<String>::New(1));
+  interfaces1[0] = "*";
+  filter3->filter.insert("test:service", interfaces1.Pass());
+  Array<String> interfaces2(Array<String>::New(1));
+  interfaces2[0] = String::From(std::string(Safe::Name_));
+  filter3->filter.insert("test:service2", interfaces2.Pass());
+  RunApplication("test:wildcard3", filter3.Pass());
+
+  loop()->Run();
+
+  EXPECT_TRUE(validator.expectations_met());
+}
+
+}  // namespace
+}  // namespace shell
+}  // namespace mojo