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package se.leap.bitmaskclient.firewall;
/**
* Copyright (c) 2020 LEAP Encryption Access Project and contributers
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
import android.content.Context;
import android.os.Handler;
import android.os.Looper;
import android.widget.Toast;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import de.blinkt.openvpn.core.VpnStatus;
import se.leap.bitmaskclient.R;
import se.leap.bitmaskclient.base.utils.PreferenceHelper;
import se.leap.bitmaskclient.tethering.TetheringObservable;
import se.leap.bitmaskclient.tethering.TetheringState;
public class FirewallManager implements FirewallCallback, PropertyChangeListener {
public static String BITMASK_CHAIN = "bitmask_fw";
public static String BITMASK_FORWARD = "bitmask_forward";
public static String BITMASK_POSTROUTING = "bitmask_postrouting";
static final String TAG = FirewallManager.class.getSimpleName();
private boolean isRunning = false;
private Context context;
public FirewallManager(Context context, boolean observeTethering) {
this.context = context;
if (observeTethering) {
TetheringObservable.getInstance().addObserver(this);
}
}
@Override
public void onFirewallStarted(boolean success) {
if (success) {
VpnStatus.logInfo("[FIREWALL] Custom rules established");
} else {
VpnStatus.logError("[FIREWALL] Could not establish custom rules.");
}
}
@Override
public void onFirewallStopped(boolean success) {
if (success) {
VpnStatus.logInfo("[FIREWALL] Custom rules deleted");
} else {
VpnStatus.logError("[FIREWALL] Could not delete custom rules");
}
}
@Override
public void onTetheringStarted(boolean success) {
if (success) {
VpnStatus.logInfo("[FIREWALL] Rules for tethering enabled");
} else {
VpnStatus.logError("[FIREWALL] Could not enable rules for tethering.");
}
}
@Override
public void onTetheringStopped(boolean success) {
if (success) {
VpnStatus.logInfo("[FIREWALL] Rules for tethering successfully disabled");
} else {
VpnStatus.logError("[FIREWALL] Could not disable rules for tethering.");
}
}
@Override
public void onSuRequested(boolean success) {
if (!success) {
VpnStatus.logError("[FIREWALL] Root permission needed to execute custom firewall rules.");
new Handler(Looper.getMainLooper()).post(() -> {
Toast.makeText(context.getApplicationContext(), context.getString(R.string.root_permission_error, context.getString(R.string.app_name)), Toast.LENGTH_LONG).show();
});
TetheringObservable.allowVpnWifiTethering(false);
TetheringObservable.allowVpnUsbTethering(false);
TetheringObservable.allowVpnBluetoothTethering(false);
PreferenceHelper.allowWifiTethering(false);
PreferenceHelper.allowUsbTethering(false);
PreferenceHelper.allowBluetoothTethering(false);
PreferenceHelper.setUseIPv6Firewall(false);
}
}
public void onDestroy() {
TetheringObservable.getInstance().deleteObserver(this);
}
public void start() {
if (!isRunning) {
isRunning = true;
if (PreferenceHelper.useIpv6Firewall()) {
startIPv6Firewall();
}
TetheringState tetheringState = TetheringObservable.getInstance().getTetheringState();
if (tetheringState.hasAnyDeviceTetheringEnabled() && tetheringState.hasAnyVpnTetheringAllowed()) {
startTethering();
}
}
}
public void stop() {
isRunning = false;
if (PreferenceHelper.useIpv6Firewall()) {
stopIPv6Firewall();
}
TetheringState tetheringState = TetheringObservable.getInstance().getTetheringState();
if (tetheringState.hasAnyDeviceTetheringEnabled() && tetheringState.hasAnyVpnTetheringAllowed()) {
stopTethering();
}
}
public void startTethering() {
SetupTetheringTask task = new SetupTetheringTask(this);
task.execute();
}
public void stopTethering() {
ShutdownTetheringTask task = new ShutdownTetheringTask(this);
task.execute();
}
public void startIPv6Firewall() {
StartIPv6FirewallTask task = new StartIPv6FirewallTask(this);
task.execute();
}
public void stopIPv6Firewall() {
ShutdownIPv6FirewallTask task = new ShutdownIPv6FirewallTask(this);
task.execute();
}
@Override
public void propertyChange(PropertyChangeEvent evt) {
if (TetheringObservable.PROPERTY_CHANGE.equals(evt.getPropertyName())) {
TetheringObservable observable = (TetheringObservable) evt.getNewValue();
TetheringState state = observable.getTetheringState();
if (state.hasAnyVpnTetheringAllowed() && state.hasAnyDeviceTetheringEnabled()) {
startTethering();
} else {
stopTethering();
}
}
}
}
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