Merge branch '1980-catch-security-exceptions-from-connectivity-manager' into 'master'

Catch SecurityExceptions from all ConnectivityManager calls

Closes #1980

See merge request briar/briar!1634

bramble-android/src/main/java/org/briarproject/bramble/network/AndroidNetworkManager.java

@@ -11,6 +11,8 @@ import android.net.LinkAddress;
 import android.net.LinkProperties;
 import android.net.Network;
 import android.net.NetworkInfo;
+import android.net.wifi.WifiInfo;
+import android.net.wifi.WifiManager;
 
 import org.briarproject.bramble.api.event.EventBus;
 import org.briarproject.bramble.api.event.EventExecutor;
@@ -38,6 +40,7 @@ import javax.annotation.Nullable;
 import javax.inject.Inject;
 
 import static android.content.Context.CONNECTIVITY_SERVICE;
+import static android.content.Context.WIFI_SERVICE;
 import static android.content.Intent.ACTION_SCREEN_OFF;
 import static android.content.Intent.ACTION_SCREEN_ON;
 import static android.net.ConnectivityManager.CONNECTIVITY_ACTION;
@@ -111,15 +114,37 @@ class AndroidNetworkManager implements NetworkManager, Service {
 
 	@Override
 	public NetworkStatus getNetworkStatus() {
-		NetworkInfo net = connectivityManager.getActiveNetworkInfo();
-		boolean connected = net != null && net.isConnected();
-		boolean wifi = false, ipv6Only = false;
-		if (connected) {
-			wifi = net.getType() == TYPE_WIFI;
-			if (SDK_INT >= 23) ipv6Only = isActiveNetworkIpv6Only();
-			else ipv6Only = areAllAvailableNetworksIpv6Only();
+		// https://issuetracker.google.com/issues/175055271
+		try {
+			NetworkInfo net = connectivityManager.getActiveNetworkInfo();
+			boolean connected = net != null && net.isConnected();
+			boolean wifi = false, ipv6Only = false;
+			if (connected) {
+				wifi = net.getType() == TYPE_WIFI;
+				if (SDK_INT >= 23) ipv6Only = isActiveNetworkIpv6Only();
+				else ipv6Only = areAllAvailableNetworksIpv6Only();
+			}
+			return new NetworkStatus(connected, wifi, ipv6Only);
+		} catch (SecurityException e) {
+			logException(LOG, WARNING, e);
+			// Without the ConnectivityManager we can't detect whether we have
+			// internet access. Assume we do, which is probably less harmful
+			// than assuming we don't. Likewise, assume the connection is
+			// IPv6-only. Fall back to the WifiManager to detect whether we
+			// have a wifi connection.
+			LOG.info("ConnectivityManager is broken, guessing connectivity");
+			boolean connected = true, wifi = false, ipv6Only = true;
+			WifiManager wm = (WifiManager) app.getSystemService(WIFI_SERVICE);
+			if (wm != null) {
+				WifiInfo info = wm.getConnectionInfo();
+				if (info != null && info.getIpAddress() != 0) {
+					LOG.info("Connected to wifi");
+					wifi = true;
+					ipv6Only = false;
+				}
+			}
+			return new NetworkStatus(connected, wifi, ipv6Only);
 		}
-		return new NetworkStatus(connected, wifi, ipv6Only);
 	}
 
 	/**
@@ -130,23 +155,29 @@ class AndroidNetworkManager implements NetworkManager, Service {
 	 */
 	@TargetApi(23)
 	private boolean isActiveNetworkIpv6Only() {
-		Network net = connectivityManager.getActiveNetwork();
-		if (net == null) {
-			LOG.info("No active network");
+		// https://issuetracker.google.com/issues/175055271
+		try {
+			Network net = connectivityManager.getActiveNetwork();
+			if (net == null) {
+				LOG.info("No active network");
+				return false;
+			}
+			LinkProperties props = connectivityManager.getLinkProperties(net);
+			if (props == null) {
+				LOG.info("No link properties for active network");
+				return false;
+			}
+			boolean hasIpv6Unicast = false;
+			for (LinkAddress linkAddress : props.getLinkAddresses()) {
+				InetAddress addr = linkAddress.getAddress();
+				if (addr instanceof Inet4Address) return false;
+				if (!addr.isMulticastAddress()) hasIpv6Unicast = true;
+			}
+			return hasIpv6Unicast;
+		} catch (SecurityException e) {
+			logException(LOG, WARNING, e);
 			return false;
 		}
-		LinkProperties props = connectivityManager.getLinkProperties(net);
-		if (props == null) {
-			LOG.info("No link properties for active network");
-			return false;
-		}
-		boolean hasIpv6Unicast = false;
-		for (LinkAddress linkAddress : props.getLinkAddresses()) {
-			InetAddress addr = linkAddress.getAddress();
-			if (addr instanceof Inet4Address) return false;
-			if (!addr.isMulticastAddress()) hasIpv6Unicast = true;
-		}
-		return hasIpv6Unicast;
 	}
 
 	/**

bramble-android/src/main/java/org/briarproject/bramble/plugin/tcp/AndroidLanTcpPlugin.java

@@ -175,16 +175,24 @@ class AndroidLanTcpPlugin extends LanTcpPlugin {
 	@TargetApi(21)
 	@Nullable
 	private InetAddress getWifiClientIpv6Address() {
-		for (Network net : connectivityManager.getAllNetworks()) {
-			NetworkCapabilities caps =
-					connectivityManager.getNetworkCapabilities(net);
-			if (caps == null || !caps.hasTransport(TRANSPORT_WIFI)) continue;
-			LinkProperties props = connectivityManager.getLinkProperties(net);
-			if (props == null) continue;
-			for (LinkAddress linkAddress : props.getLinkAddresses()) {
-				InetAddress addr = linkAddress.getAddress();
-				if (isIpv6LinkLocalAddress(addr)) return addr;
+		// https://issuetracker.google.com/issues/175055271
+		try {
+			for (Network net : connectivityManager.getAllNetworks()) {
+				NetworkCapabilities caps =
+						connectivityManager.getNetworkCapabilities(net);
+				if (caps == null || !caps.hasTransport(TRANSPORT_WIFI)) {
+					continue;
+				}
+				LinkProperties props =
+						connectivityManager.getLinkProperties(net);
+				if (props == null) continue;
+				for (LinkAddress linkAddress : props.getLinkAddresses()) {
+					InetAddress addr = linkAddress.getAddress();
+					if (isIpv6LinkLocalAddress(addr)) return addr;
+				}
 			}
+		} catch (SecurityException e) {
+			logException(LOG, WARNING, e);
 		}
 		return null;
 	}
@@ -227,12 +235,17 @@ class AndroidLanTcpPlugin extends LanTcpPlugin {
 	// network's socket factory may try to connect via another network
 	private SocketFactory getSocketFactory() {
 		if (SDK_INT < 21) return SocketFactory.getDefault();
-		for (Network net : connectivityManager.getAllNetworks()) {
-			NetworkCapabilities caps =
-					connectivityManager.getNetworkCapabilities(net);
-			if (caps != null && caps.hasTransport(TRANSPORT_WIFI)) {
-				return net.getSocketFactory();
+		// https://issuetracker.google.com/issues/175055271
+		try {
+			for (Network net : connectivityManager.getAllNetworks()) {
+				NetworkCapabilities caps =
+						connectivityManager.getNetworkCapabilities(net);
+				if (caps != null && caps.hasTransport(TRANSPORT_WIFI)) {
+					return net.getSocketFactory();
+				}
 			}
+		} catch (SecurityException e) {
+			logException(LOG, WARNING, e);
 		}
 		LOG.warning("Could not find suitable socket factory");
 		return SocketFactory.getDefault();

briar-android/src/main/java/org/briarproject/briar/android/reporting/BriarReportCollector.java

@@ -198,38 +198,47 @@ class BriarReportCollector {
 	private ReportItem getConnectivity() {
 		MultiReportInfo connectivityInfo = new MultiReportInfo();
 
-		// Is mobile data available?
-		ConnectivityManager cm = requireNonNull(
-				getSystemService(ctx, ConnectivityManager.class));
-		NetworkInfo mobile = cm.getNetworkInfo(TYPE_MOBILE);
-		boolean mobileAvailable = mobile != null && mobile.isAvailable();
-		connectivityInfo.add("MobileDataAvailable", mobileAvailable);
-
-		// Is mobile data enabled?
-		boolean mobileEnabled = false;
+		// https://issuetracker.google.com/issues/175055271
 		try {
-			Class<?> clazz = Class.forName(cm.getClass().getName());
-			Method method = clazz.getDeclaredMethod("getMobileDataEnabled");
-			method.setAccessible(true);
-			mobileEnabled = (Boolean) requireNonNull(method.invoke(cm));
-		} catch (ClassNotFoundException
-				| NoSuchMethodException
-				| IllegalArgumentException
-				| InvocationTargetException
-				| IllegalAccessException e) {
-			connectivityInfo
-					.add("MobileDataReflectionException", e.toString());
+			// Is mobile data available?
+			ConnectivityManager cm = requireNonNull(
+					getSystemService(ctx, ConnectivityManager.class));
+			NetworkInfo mobile = cm.getNetworkInfo(TYPE_MOBILE);
+			boolean mobileAvailable = mobile != null && mobile.isAvailable();
+			connectivityInfo.add("MobileDataAvailable", mobileAvailable);
+
+			// Is mobile data enabled?
+			boolean mobileEnabled = false;
+			try {
+				Class<?> clazz = Class.forName(cm.getClass().getName());
+				Method method = clazz.getDeclaredMethod("getMobileDataEnabled");
+				method.setAccessible(true);
+				mobileEnabled = (Boolean) requireNonNull(method.invoke(cm));
+			} catch (ClassNotFoundException
+					| NoSuchMethodException
+					| IllegalArgumentException
+					| InvocationTargetException
+					| IllegalAccessException e) {
+				connectivityInfo
+						.add("MobileDataReflectionException", e.toString());
+			}
+			connectivityInfo.add("MobileDataEnabled", mobileEnabled);
+
+			// Is mobile data connected ?
+			boolean mobileConnected = mobile != null && mobile.isConnected();
+			connectivityInfo.add("MobileDataConnected", mobileConnected);
+
+			// Is wifi available?
+			NetworkInfo wifi = cm.getNetworkInfo(TYPE_WIFI);
+			boolean wifiAvailable = wifi != null && wifi.isAvailable();
+			connectivityInfo.add("WifiAvailable", wifiAvailable);
+
+			// Is wifi connected?
+			boolean wifiConnected = wifi != null && wifi.isConnected();
+			connectivityInfo.add("WifiConnected", wifiConnected);
+		} catch (SecurityException e) {
+			connectivityInfo.add("ConnectivityManagerException", e.toString());
 		}
-		connectivityInfo.add("MobileDataEnabled", mobileEnabled);
-
-		// Is mobile data connected ?
-		boolean mobileConnected = mobile != null && mobile.isConnected();
-		connectivityInfo.add("MobileDataConnected", mobileConnected);
-
-		// Is wifi available?
-		NetworkInfo wifi = cm.getNetworkInfo(TYPE_WIFI);
-		boolean wifiAvailable = wifi != null && wifi.isAvailable();
-		connectivityInfo.add("WifiAvailable", wifiAvailable);
 
 		// Is wifi enabled?
 		WifiManager wm = getSystemService(ctx, WifiManager.class);
@@ -237,10 +246,6 @@ class BriarReportCollector {
 				wm.getWifiState() == WIFI_STATE_ENABLED;
 		connectivityInfo.add("WifiEnabled", wifiEnabled);
 
-		// Is wifi connected?
-		boolean wifiConnected = wifi != null && wifi.isConnected();
-		connectivityInfo.add("WifiConnected", wifiConnected);
-
 		// Is wifi direct supported?
 		boolean wifiDirect = ctx.getSystemService(WIFI_P2P_SERVICE) != null;
 		connectivityInfo.add("WiFiDirectSupported", wifiDirect);