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-rw-r--r--app/src/main/java/se/leap/bitmaskclient/utils/Cmd.java93
-rw-r--r--app/src/main/java/se/leap/bitmaskclient/utils/FirewallHelper.java167
2 files changed, 260 insertions, 0 deletions
diff --git a/app/src/main/java/se/leap/bitmaskclient/utils/Cmd.java b/app/src/main/java/se/leap/bitmaskclient/utils/Cmd.java
new file mode 100644
index 00000000..a72658a4
--- /dev/null
+++ b/app/src/main/java/se/leap/bitmaskclient/utils/Cmd.java
@@ -0,0 +1,93 @@
+/**
+ * Copyright (c) 2019 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/>.
+ */
+
+package se.leap.bitmaskclient.utils;
+
+import android.support.annotation.WorkerThread;
+import android.util.Log;
+
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.io.OutputStreamWriter;
+
+public class Cmd {
+
+ private static final String TAG = Cmd.class.getSimpleName();
+
+ @WorkerThread
+ public static int runBlockingCmd(String[] cmds, StringBuilder log) throws Exception {
+ return runCmd(cmds, log, true);
+ }
+
+ @WorkerThread
+ private static int runCmd(String[] cmds, StringBuilder log,
+ boolean waitFor) throws Exception {
+
+ int exitCode = -1;
+ Process proc = Runtime.getRuntime().exec("sh");
+ OutputStreamWriter out = new OutputStreamWriter(proc.getOutputStream());
+
+ try {
+ for (String cmd : cmds) {
+ Log.d(TAG, "executing CMD: " + cmd);
+ out.write(cmd);
+ out.write("\n");
+ }
+
+ out.flush();
+ out.write("exit\n");
+ out.flush();
+ } catch (IOException e) {
+ e.printStackTrace();
+ } finally {
+ out.close();
+ }
+
+ if (waitFor) {
+ // Consume the "stdout"
+ InputStreamReader reader = new InputStreamReader(proc.getInputStream());
+ readToLogString(reader, log);
+
+ // Consume the "stderr"
+ reader = new InputStreamReader(proc.getErrorStream());
+ readToLogString(reader, log);
+
+ try {
+ exitCode = proc.waitFor();
+ } catch (InterruptedException e) {
+ e.printStackTrace();
+ }
+ }
+
+ return exitCode;
+ }
+
+ private static void readToLogString(InputStreamReader reader, StringBuilder log) throws IOException {
+ final char buf[] = new char[10];
+ int read = 0;
+ try {
+ while ((read = reader.read(buf)) != -1) {
+ if (log != null)
+ log.append(buf, 0, read);
+ }
+ } catch (IOException e) {
+ reader.close();
+ throw new IOException(e);
+ }
+ reader.close();
+ }
+}
diff --git a/app/src/main/java/se/leap/bitmaskclient/utils/FirewallHelper.java b/app/src/main/java/se/leap/bitmaskclient/utils/FirewallHelper.java
new file mode 100644
index 00000000..43a5296f
--- /dev/null
+++ b/app/src/main/java/se/leap/bitmaskclient/utils/FirewallHelper.java
@@ -0,0 +1,167 @@
+package se.leap.bitmaskclient.utils;
+/**
+ * Copyright (c) 2019 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.os.AsyncTask;
+import android.text.TextUtils;
+import android.util.Log;
+
+import java.lang.ref.WeakReference;
+
+import static se.leap.bitmaskclient.utils.Cmd.runBlockingCmd;
+
+interface FirewallCallback {
+ void onFirewallStarted(boolean success);
+ void onFirewallStopped(boolean success);
+}
+
+
+public class FirewallHelper implements FirewallCallback {
+ private static String BITMASK_CHAIN = "bitmask_fw";
+ private static final String TAG = FirewallHelper.class.getSimpleName();
+
+
+ @Override
+ public void onFirewallStarted(boolean success) {
+ Log.d(TAG, "Firewall started " + success);
+ }
+
+ @Override
+ public void onFirewallStopped(boolean success) {
+ Log.d(TAG, "Firewall stopped " + success);
+ }
+
+
+ static class StartFirewallTask extends AsyncTask<Void, Boolean, Boolean> {
+
+ WeakReference<FirewallCallback> callbackWeakReference;
+
+ public StartFirewallTask(FirewallCallback callback) {
+ callbackWeakReference = new WeakReference<>(callback);
+ }
+
+ @Override
+ protected Boolean doInBackground(Void... voids) {
+ if (requestSU()) {
+ Log.d(TAG, "su acquired");
+ StringBuilder log = new StringBuilder();
+ String[] bitmaskChain = new String[]{
+ "su",
+ "ip6tables --list " + BITMASK_CHAIN };
+ try {
+ boolean hasBitmaskChain = runBlockingCmd(bitmaskChain, log) == 0;
+ Log.d(TAG, log.toString());
+ if (!hasBitmaskChain) {
+ String[] createChain = new String[]{
+ "su",
+ "ip6tables --new-chain " + BITMASK_CHAIN,
+ "ip6tables --insert OUTPUT --jump " + BITMASK_CHAIN };
+ log = new StringBuilder();
+ int success = runBlockingCmd(createChain, log);
+ Log.d(TAG, "added " + BITMASK_CHAIN + " to ip6tables: " + success);
+ Log.d(TAG, log.toString());
+ if (success != 0) {
+ return false;
+ }
+ }
+
+ log = new StringBuilder();
+ String[] addRules = new String[] {
+ "su",
+ "ip6tables --append " + BITMASK_CHAIN + " -p tcp --jump REJECT",
+ "ip6tables --append " + BITMASK_CHAIN + " -p udp --jump REJECT" };
+ boolean successResult = runBlockingCmd(addRules, log) == 0;
+ Log.d(TAG, log.toString());
+ return successResult;
+ } catch (Exception e) {
+ e.printStackTrace();
+ Log.e(TAG, log.toString());
+ }
+ };
+ return false;
+ }
+
+ @Override
+ protected void onPostExecute(Boolean result) {
+ super.onPostExecute(result);
+ FirewallCallback callback = callbackWeakReference.get();
+ if (callback != null) {
+ callback.onFirewallStarted(result);
+ }
+ }
+ }
+
+ static class ShutdownFirewallTask extends AsyncTask<Void, Boolean, Boolean> {
+
+ @Override
+ protected Boolean doInBackground(Void... voids) {
+
+ if (requestSU()) {
+ StringBuilder log = new StringBuilder();
+ String[] deleteChain = new String[]{
+ "su",
+ "ip6tables --delete OUTPUT --jump " + BITMASK_CHAIN,
+ "ip6tables --flush " + BITMASK_CHAIN,
+ "ip6tables --delete-chain " + BITMASK_CHAIN
+ };
+ try {
+ runBlockingCmd(deleteChain, log);
+ } catch (Exception e) {
+ e.printStackTrace();
+ Log.e(TAG, log.toString());
+ }
+
+ }
+
+ return null;
+ }
+ }
+
+
+ public void startFirewall() {
+ StartFirewallTask task = new StartFirewallTask(this);
+ task.execute();
+ }
+
+ public void shutdownFirewall() {
+ ShutdownFirewallTask task = new ShutdownFirewallTask();
+ task.execute();
+ }
+
+ public static boolean hasSU() {
+ StringBuilder log = new StringBuilder();
+
+ try {
+ String suCommand = "su -v";
+ runBlockingCmd(new String[]{suCommand}, log);
+ } catch (Exception e) {
+ return false;
+ }
+
+ return !TextUtils.isEmpty(log) && !log.toString().contains("su: not found");
+ }
+
+ public static boolean requestSU() {
+ try {
+ String suCommand = "su";
+ return runBlockingCmd(new String[]{suCommand}, null) == 0;
+ } catch (Exception e) {
+ return false;
+ }
+ }
+
+}
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