[CrOS MultiDevice] Handle removed/disabled BluetoothAdapter on request.

SecureChannel previously had no checks for when the BluetoothAdapter is
disabled or removed.

This CL adds an additional check within SecureChannelImpl that will
cancel a connection request early if the BluetoothAdapter is either
disabled or removed, as well as notify the client of the failure
reason.

Bug: 854366
Change-Id: I021435611c8a018da3e77a9eeb9c001311adada4
Reviewed-on: https://chromium-review.googlesource.com/1194675Reviewed-by: Ryan Hansberry <hansberry@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Commit-Queue: Kyle Qian <kyleqian@google.com>
Cr-Commit-Position: refs/heads/master@{#589399}

chromeos/services/secure_channel/public/mojom/secure_channel.mojom

@@ -34,7 +34,13 @@ enum ConnectionAttemptFailureReason {
   REMOTE_DEVICE_INVALID_PSK,
 
   // Timeouts occurred trying to contact the remote device.
-  TIMEOUT_FINDING_DEVICE
+  TIMEOUT_FINDING_DEVICE,
+
+  // The local Bluetooth adapter is disabled (turned off).
+  ADAPTER_DISABLED,
+
+  // The local Bluetooth adapter is not present.
+  ADAPTER_NOT_PRESENT
 };
 
 enum ConnectionCreationDetail {

chromeos/services/secure_channel/secure_channel_impl.cc

@@ -71,7 +71,8 @@ SecureChannelImpl::ConnectionRequestWaitingForDisconnection::
 
 SecureChannelImpl::SecureChannelImpl(
     scoped_refptr<device::BluetoothAdapter> bluetooth_adapter)
-    : timer_factory_(TimerFactoryImpl::Factory::Get()->BuildInstance()),
+    : bluetooth_adapter_(std::move(bluetooth_adapter)),
+      timer_factory_(TimerFactoryImpl::Factory::Get()->BuildInstance()),
       remote_device_cache_(
           cryptauth::RemoteDeviceCache::Factory::Get()->BuildInstance()),
       ble_service_data_helper_(
@@ -79,7 +80,7 @@ SecureChannelImpl::SecureChannelImpl(
               remote_device_cache_.get())),
       ble_connection_manager_(
           BleConnectionManagerImpl::Factory::Get()->BuildInstance(
-              bluetooth_adapter,
+              bluetooth_adapter_,
               ble_service_data_helper_.get(),
               timer_factory_.get())),
       pending_connection_manager_(
@@ -207,6 +208,17 @@ void SecureChannelImpl::ProcessConnectionRequest(
     return;
   }
 
+  // Check 4: Medium-specific verification.
+  switch (connection_medium) {
+    case ConnectionMedium::kBluetoothLowEnergy:
+      // Is the local Bluetooth adapter disabled or not present? If either,
+      // notify client and return early.
+      if (CheckIfBluetoothAdapterDisabledOrNotPresent(
+              api_fn_name, client_connection_parameters.get()))
+        return;
+      break;
+  }
+
   // At this point, the request has been deemed valid.
   ConnectionAttemptDetails connection_attempt_details(
       device_to_connect.GetDeviceId(), local_device.GetDeviceId(),
@@ -320,6 +332,26 @@ bool SecureChannelImpl::CheckForInvalidInputDevice(
   return true;
 }
 
+bool SecureChannelImpl::CheckIfBluetoothAdapterDisabledOrNotPresent(
+    ApiFunctionName api_fn_name,
+    ClientConnectionParameters* client_connection_parameters) {
+  if (!bluetooth_adapter_->IsPresent()) {
+    RejectRequestForReason(
+        api_fn_name, mojom::ConnectionAttemptFailureReason::ADAPTER_NOT_PRESENT,
+        client_connection_parameters);
+    return true;
+  }
+
+  if (!bluetooth_adapter_->IsPowered()) {
+    RejectRequestForReason(
+        api_fn_name, mojom::ConnectionAttemptFailureReason::ADAPTER_DISABLED,
+        client_connection_parameters);
+    return true;
+  }
+
+  return false;
+}
+
 base::Optional<SecureChannelImpl::InvalidRemoteDeviceReason>
 SecureChannelImpl::AddDeviceToCacheIfPossible(
     ApiFunctionName api_fn_name,

chromeos/services/secure_channel/secure_channel_impl.h

@@ -56,7 +56,8 @@ class SecureChannelImpl : public mojom::SecureChannel,
   ~SecureChannelImpl() override;
 
  private:
-  SecureChannelImpl(scoped_refptr<device::BluetoothAdapter> bluetooth_adapter);
+  explicit SecureChannelImpl(
+      scoped_refptr<device::BluetoothAdapter> bluetooth_adapter);
 
   enum class InvalidRemoteDeviceReason { kInvalidPublicKey, kInvalidPsk };
 
@@ -136,6 +137,12 @@ class SecureChannelImpl : public mojom::SecureChannel,
       ClientConnectionParameters* client_connection_parameters,
       bool is_local_device);
 
+  // Checks if |bluetooth_adapter_| is disabled or not present and rejects the
+  // connection request if so. Returns whether the request was rejected.
+  bool CheckIfBluetoothAdapterDisabledOrNotPresent(
+      ApiFunctionName api_fn_name,
+      ClientConnectionParameters* client_connection_parameters);
+
   // Validates |device| and adds it to the |remote_device_cache_| if it is
   // valid. If it is not valid, the reason is provided as a return type, and the
   // device is not added to the cache.
@@ -143,6 +150,7 @@ class SecureChannelImpl : public mojom::SecureChannel,
       ApiFunctionName api_fn_name,
       const cryptauth::RemoteDevice& device);
 
+  scoped_refptr<device::BluetoothAdapter> bluetooth_adapter_;
   std::unique_ptr<TimerFactory> timer_factory_;
   std::unique_ptr<cryptauth::RemoteDeviceCache> remote_device_cache_;
   std::unique_ptr<BleServiceDataHelper> ble_service_data_helper_;

chromeos/services/secure_channel/secure_channel_service_unittest.cc

@@ -321,6 +321,14 @@ class SecureChannelServiceTest : public testing::Test {
   void SetUp() override {
     mock_adapter_ =
         base::MakeRefCounted<testing::NiceMock<device::MockBluetoothAdapter>>();
+    is_adapter_powered_ = true;
+    is_adapter_present_ = true;
+    ON_CALL(*mock_adapter_, IsPresent())
+        .WillByDefault(
+            Invoke(this, &SecureChannelServiceTest::is_adapter_present));
+    ON_CALL(*mock_adapter_, IsPowered())
+        .WillByDefault(
+            Invoke(this, &SecureChannelServiceTest::is_adapter_powered));
     device::BluetoothAdapterFactory::SetAdapterForTesting(mock_adapter_);
 
     test_task_runner_ = base::MakeRefCounted<base::TestSimpleTaskRunner>();
@@ -584,6 +592,12 @@ class SecureChannelServiceTest : public testing::Test {
 
   const cryptauth::RemoteDeviceList& test_devices() { return test_devices_; }
 
+  bool is_adapter_present() { return is_adapter_present_; }
+  void set_is_adapter_present(bool present) { is_adapter_present_ = present; }
+
+  bool is_adapter_powered() { return is_adapter_powered_; }
+  void set_is_adapter_powered(bool powered) { is_adapter_powered_ = powered; }
+
  private:
   void AttemptConnectionAndVerifyPendingConnection(
       const cryptauth::RemoteDevice& device_to_connect,
@@ -853,6 +867,9 @@ class SecureChannelServiceTest : public testing::Test {
   std::unique_ptr<service_manager::TestConnectorFactory> connector_factory_;
   std::unique_ptr<service_manager::Connector> connector_;
 
+  bool is_adapter_powered_;
+  bool is_adapter_present_;
+
   mojom::SecureChannelPtr secure_channel_ptr_;
 
   DISALLOW_COPY_AND_ASSIGN(SecureChannelServiceTest);
@@ -948,6 +965,48 @@ TEST_F(SecureChannelServiceTest, InitiateConnection_MissingLocalDevicePsk) {
       mojom::ConnectionAttemptFailureReason::LOCAL_DEVICE_INVALID_PSK);
 }
 
+TEST_F(SecureChannelServiceTest,
+       ListenForConnection_BluetoothAdapterNotPresent) {
+  FinishInitialization();
+
+  set_is_adapter_present(false);
+
+  CallListenForConnectionFromDeviceAndVerifyRejection(
+      test_devices()[0], test_devices()[1], "feature", ConnectionPriority::kLow,
+      mojom::ConnectionAttemptFailureReason::ADAPTER_NOT_PRESENT);
+}
+
+TEST_F(SecureChannelServiceTest,
+       InitiateConnection_BluetoothAdapterNotPresent) {
+  FinishInitialization();
+
+  set_is_adapter_present(false);
+
+  CallInitiateConnectionToDeviceAndVerifyRejection(
+      test_devices()[0], test_devices()[1], "feature", ConnectionPriority::kLow,
+      mojom::ConnectionAttemptFailureReason::ADAPTER_NOT_PRESENT);
+}
+
+TEST_F(SecureChannelServiceTest, ListenForConnection_BluetoothAdapterDisabled) {
+  FinishInitialization();
+
+  set_is_adapter_powered(false);
+
+  CallListenForConnectionFromDeviceAndVerifyRejection(
+      test_devices()[0], test_devices()[1], "feature", ConnectionPriority::kLow,
+      mojom::ConnectionAttemptFailureReason::ADAPTER_DISABLED);
+}
+
+TEST_F(SecureChannelServiceTest, InitiateConnection_BluetoothAdapterDisabled) {
+  FinishInitialization();
+
+  set_is_adapter_powered(false);
+
+  CallInitiateConnectionToDeviceAndVerifyRejection(
+      test_devices()[0], test_devices()[1], "feature", ConnectionPriority::kLow,
+      mojom::ConnectionAttemptFailureReason::ADAPTER_DISABLED);
+}
+
 TEST_F(SecureChannelServiceTest, CallsQueuedBeforeInitializationComplete) {
   CallInitiateConnectionToDeviceAndVerifyInitializationNotComplete(
       test_devices()[4], test_devices()[5], "feature",