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Fix bluetooth settings will broadcast to anywhere when some cases

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BluetoothPermissionActivity and DevicePickerFragment will send
broadcast to return the result to calling apps. As this broadcast
intent is from Settings with uid 1000, it will be sent to any
protected BroadcastReceivers in the device. It can make an attacker
send broadcast to protected BroadcastReceivers like factory reset intent
(android/com.android.server.MasterClearReceiver) via
BluetoothPermissionActivity or DevicePickerFragment.

This CL will compare to calling package name with launch package name.
If they are not equal, the broadcast will not send to launch package name.

Bug: 179386960
Bug: 179386068
Test: make -j42 RunSettingsRoboTests and use test apk to manually test
to verify factory reset not started and no system UI notification.

Change-Id: Ib8a5acde663e875912d300dd4912c4e9416f02f1
This commit is contained in:
Hugh Chen
2021-03-12 10:40:20 +08:00
parent 6d513a2c67
commit 9d00364da4
5 changed files with 268 additions and 115 deletions
Download Patch File Download Diff File Expand all files Collapse all files

117
src/com/android/settings/bluetooth/BluetoothPermissionActivity.java
View File

@@ -16,6 +16,8 @@
package com.android.settings.bluetooth;
import static android.view.WindowManager.LayoutParams.SYSTEM_FLAG_HIDE_NON_SYSTEM_OVERLAY_WINDOWS;
import android.bluetooth.BluetoothDevice;
import android.content.BroadcastReceiver;
import android.content.Context;
@@ -23,6 +25,7 @@ import android.content.DialogInterface;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.text.TextUtils;
import android.util.Log;
import android.view.View;
import android.widget.Button;
@@ -30,11 +33,14 @@ import android.widget.TextView;
import androidx.preference.Preference;
import com.android.internal.annotations.VisibleForTesting;
import com.android.internal.app.AlertActivity;
import com.android.internal.app.AlertController;
import com.android.settings.R;
import static android.view.WindowManager.LayoutParams.SYSTEM_FLAG_HIDE_NON_SYSTEM_OVERLAY_WINDOWS;
import com.android.settings.password.PasswordUtils;
import com.android.settingslib.bluetooth.CachedBluetoothDevice;
import com.android.settingslib.bluetooth.CachedBluetoothDeviceManager;
import com.android.settingslib.bluetooth.LocalBluetoothManager;
/**
* BluetoothPermissionActivity shows a dialog for accepting incoming
@@ -51,8 +57,13 @@ public class BluetoothPermissionActivity extends AlertActivity implements
private TextView messageView;
private Button mOkButton;
private BluetoothDevice mDevice;
private String mReturnPackage = null;
private String mReturnClass = null;
@VisibleForTesting
String mReturnPackage = null;
@VisibleForTesting
String mReturnClass = null;
@VisibleForTesting
String mCallingAppPackageName;
private int mRequestType = 0;
private BroadcastReceiver mReceiver = new BroadcastReceiver() {
@@ -80,6 +91,7 @@ public class BluetoothPermissionActivity extends AlertActivity implements
getWindow().addPrivateFlags(SYSTEM_FLAG_HIDE_NON_SYSTEM_OVERLAY_WINDOWS);
Intent i = getIntent();
mCallingAppPackageName = PasswordUtils.getCallingAppPackageName(getActivityToken());
String action = i.getAction();
if (!action.equals(BluetoothDevice.ACTION_CONNECTION_ACCESS_REQUEST)) {
Log.e(TAG, "Error: this activity may be started only with intent "
@@ -94,6 +106,22 @@ public class BluetoothPermissionActivity extends AlertActivity implements
mRequestType = i.getIntExtra(BluetoothDevice.EXTRA_ACCESS_REQUEST_TYPE,
BluetoothDevice.REQUEST_TYPE_PHONEBOOK_ACCESS);
// Even if the user has already made the choice, Bluetooth still may not know that if
// the user preference data have not been migrated from Settings app's shared
// preferences to Bluetooth app's. In that case, Bluetooth app broadcasts an
// ACTION_CONNECTION_ACCESS_REQUEST intent to ask to Settings app.
//
// If that happens, 'checkUserChoice()' here will do migration because it finds or
// creates a 'CachedBluetoothDevice' object for the device.
//
// After migration is done, 'checkUserChoice()' replies to the request by sending an
// ACTION_CONNECTION_ACCESS_REPLY intent. And we don't need to start permission activity
// dialog or notification.
if (checkUserChoice()) {
finish();
return;
}
if(DEBUG) Log.i(TAG, "onCreate() Request type: " + mRequestType);
if (mRequestType == BluetoothDevice.REQUEST_TYPE_PROFILE_CONNECTION) {
@@ -202,7 +230,14 @@ public class BluetoothPermissionActivity extends AlertActivity implements
sendReplyIntentToReceiver(false, true);
}
private void sendReplyIntentToReceiver(final boolean allowed, final boolean always) {
@VisibleForTesting
void sendReplyIntentToReceiver(final boolean allowed, final boolean always) {
if (!TextUtils.equals(mCallingAppPackageName, mReturnPackage)) {
Log.w(TAG, "sendReplyIntentToReceiver() return package name is not equivalent"
+ " to calling package name!");
return;
}
Intent intent = new Intent(BluetoothDevice.ACTION_CONNECTION_ACCESS_REPLY);
if (mReturnPackage != null && mReturnClass != null) {
@@ -246,4 +281,76 @@ public class BluetoothPermissionActivity extends AlertActivity implements
public boolean onPreferenceChange(Preference preference, Object newValue) {
return true;
}
/**
* @return true user had made a choice, this method replies to the request according
* to user's previous decision
* false user hadnot made any choice on this device
*/
private boolean checkUserChoice() {
boolean processed = false;
// ignore if it is something else than phonebook/message settings it wants us to remember
if (mRequestType != BluetoothDevice.REQUEST_TYPE_PHONEBOOK_ACCESS
&& mRequestType != BluetoothDevice.REQUEST_TYPE_MESSAGE_ACCESS
&& mRequestType != BluetoothDevice.REQUEST_TYPE_SIM_ACCESS) {
Log.d(TAG, "checkUserChoice(): Unknown RequestType " + mRequestType);
return processed;
}
final LocalBluetoothManager bluetoothManager = Utils.getLocalBtManager(this);
final CachedBluetoothDeviceManager cachedDeviceManager =
bluetoothManager.getCachedDeviceManager();
CachedBluetoothDevice cachedDevice = cachedDeviceManager.findDevice(mDevice);
if (cachedDevice == null) {
cachedDevice = cachedDeviceManager.addDevice(mDevice);
}
if (mRequestType == BluetoothDevice.REQUEST_TYPE_PHONEBOOK_ACCESS) {
final int phonebookPermission = mDevice.getPhonebookAccessPermission();
if (phonebookPermission == BluetoothDevice.ACCESS_UNKNOWN) {
// Leave 'processed' as false.
} else if (phonebookPermission == BluetoothDevice.ACCESS_ALLOWED) {
sendReplyIntentToReceiver(true, true);
processed = true;
} else if (phonebookPermission == BluetoothDevice.ACCESS_REJECTED) {
sendReplyIntentToReceiver(false, true);
processed = true;
} else {
Log.e(TAG, "Bad phonebookPermission: " + phonebookPermission);
}
} else if (mRequestType == BluetoothDevice.REQUEST_TYPE_MESSAGE_ACCESS) {
final int messagePermission = mDevice.getMessageAccessPermission();
if (messagePermission == BluetoothDevice.ACCESS_UNKNOWN) {
// Leave 'processed' as false.
} else if (messagePermission == BluetoothDevice.ACCESS_ALLOWED) {
sendReplyIntentToReceiver(true, true);
processed = true;
} else if (messagePermission == BluetoothDevice.ACCESS_REJECTED) {
sendReplyIntentToReceiver(false, true);
processed = true;
} else {
Log.e(TAG, "Bad messagePermission: " + messagePermission);
}
} else if (mRequestType == BluetoothDevice.REQUEST_TYPE_SIM_ACCESS) {
final int simPermission = mDevice.getSimAccessPermission();
if (simPermission == BluetoothDevice.ACCESS_UNKNOWN) {
// Leave 'processed' as false.
} else if (simPermission == BluetoothDevice.ACCESS_ALLOWED) {
sendReplyIntentToReceiver(true, true);
processed = true;
} else if (simPermission == BluetoothDevice.ACCESS_REJECTED) {
sendReplyIntentToReceiver(false, true);
processed = true;
} else {
Log.e(TAG, "Bad simPermission: " + simPermission);
}
}
Log.d(TAG, "checkUserChoice(): returning " + processed);
return processed;
}
}