| /* |
| * Copyright (C) 2011 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package com.android.server.connectivity; |
| |
| import android.app.Notification; |
| import android.app.NotificationManager; |
| import android.content.Context; |
| import android.content.Intent; |
| import android.content.pm.ApplicationInfo; |
| import android.content.pm.PackageManager; |
| import android.content.res.Resources; |
| import android.graphics.Bitmap; |
| import android.graphics.Canvas; |
| import android.graphics.drawable.Drawable; |
| import android.net.INetworkManagementEventObserver; |
| import android.net.LocalSocket; |
| import android.net.LocalSocketAddress; |
| import android.os.Binder; |
| import android.os.ParcelFileDescriptor; |
| import android.os.Process; |
| import android.os.SystemClock; |
| import android.os.SystemProperties; |
| import android.util.Log; |
| |
| import com.android.internal.R; |
| import com.android.internal.net.VpnConfig; |
| import com.android.server.ConnectivityService.VpnCallback; |
| |
| import java.io.OutputStream; |
| import java.nio.charset.Charsets; |
| import java.util.Arrays; |
| |
| /** |
| * @hide |
| */ |
| public class Vpn extends INetworkManagementEventObserver.Stub { |
| |
| private final static String TAG = "Vpn"; |
| private final static String VPN = android.Manifest.permission.VPN; |
| |
| private final Context mContext; |
| private final VpnCallback mCallback; |
| |
| private String mPackage = VpnConfig.LEGACY_VPN; |
| private String mInterface; |
| private LegacyVpnRunner mLegacyVpnRunner; |
| |
| public Vpn(Context context, VpnCallback callback) { |
| mContext = context; |
| mCallback = callback; |
| } |
| |
| /** |
| * Protect a socket from routing changes by binding it to the given |
| * interface. The socket IS closed by this method. |
| * |
| * @param socket The socket to be bound. |
| * @param name The name of the interface. |
| */ |
| public void protect(ParcelFileDescriptor socket, String interfaze) { |
| try { |
| mContext.enforceCallingPermission(VPN, "protect"); |
| jniProtect(socket.getFd(), interfaze); |
| } finally { |
| try { |
| socket.close(); |
| } catch (Exception e) { |
| // ignore |
| } |
| } |
| } |
| |
| /** |
| * Prepare for a VPN application. This method is designed to solve |
| * race conditions. It first compares the current prepared package |
| * with {@code oldPackage}. If they are the same, the prepared |
| * package is revoked and replaced with {@code newPackage}. If |
| * {@code oldPackage} is {@code null}, the comparison is omitted. |
| * If {@code newPackage} is the same package or {@code null}, the |
| * revocation is omitted. This method returns {@code true} if the |
| * operation is succeeded. |
| * |
| * Legacy VPN is handled specially since it is not a real package. |
| * It uses {@link VpnConfig#LEGACY_VPN} as its package name, and |
| * it can be revoked by itself. |
| * |
| * @param oldPackage The package name of the old VPN application. |
| * @param newPackage The package name of the new VPN application. |
| * @return true if the operation is succeeded. |
| */ |
| public synchronized boolean prepare(String oldPackage, String newPackage) { |
| // Return false if the package does not match. |
| if (oldPackage != null && !oldPackage.equals(mPackage)) { |
| return false; |
| } |
| |
| // Return true if we do not need to revoke. |
| if (newPackage == null || |
| (newPackage.equals(mPackage) && !newPackage.equals(VpnConfig.LEGACY_VPN))) { |
| return true; |
| } |
| |
| // Only system user can revoke a package. |
| if (Binder.getCallingUid() != Process.SYSTEM_UID) { |
| throw new SecurityException("Unauthorized Caller"); |
| } |
| |
| // Check the permission of the given package. |
| PackageManager pm = mContext.getPackageManager(); |
| if (!newPackage.equals(VpnConfig.LEGACY_VPN) && |
| pm.checkPermission(VPN, newPackage) != PackageManager.PERMISSION_GRANTED) { |
| throw new SecurityException(newPackage + " does not have " + VPN); |
| } |
| |
| // Reset the interface and hide the notification. |
| if (mInterface != null) { |
| jniReset(mInterface); |
| mCallback.restore(); |
| hideNotification(); |
| mInterface = null; |
| } |
| |
| // Send out the broadcast or stop LegacyVpnRunner. |
| if (!mPackage.equals(VpnConfig.LEGACY_VPN)) { |
| Intent intent = new Intent(VpnConfig.ACTION_VPN_REVOKED); |
| intent.setPackage(mPackage); |
| intent.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY); |
| mContext.sendBroadcast(intent); |
| } else if (mLegacyVpnRunner != null) { |
| mLegacyVpnRunner.exit(); |
| mLegacyVpnRunner = null; |
| } |
| |
| Log.i(TAG, "Switched from " + mPackage + " to " + newPackage); |
| mPackage = newPackage; |
| return true; |
| } |
| |
| /** |
| * Establish a VPN network and return the file descriptor of the VPN |
| * interface. This methods returns {@code null} if the application is |
| * revoked or not prepared. |
| * |
| * @param config The parameters to configure the network. |
| * @return The file descriptor of the VPN interface. |
| */ |
| public synchronized ParcelFileDescriptor establish(VpnConfig config) { |
| // Check the permission of the caller. |
| mContext.enforceCallingPermission(VPN, "establish"); |
| |
| // Check if the caller is already prepared. |
| PackageManager pm = mContext.getPackageManager(); |
| ApplicationInfo app = null; |
| try { |
| app = pm.getApplicationInfo(mPackage, 0); |
| } catch (Exception e) { |
| return null; |
| } |
| if (Binder.getCallingUid() != app.uid) { |
| return null; |
| } |
| |
| // Load the label. |
| String label = app.loadLabel(pm).toString(); |
| |
| // Load the icon and convert it into a bitmap. |
| Drawable icon = app.loadIcon(pm); |
| Bitmap bitmap = null; |
| if (icon.getIntrinsicWidth() > 0 && icon.getIntrinsicHeight() > 0) { |
| int width = mContext.getResources().getDimensionPixelSize( |
| android.R.dimen.notification_large_icon_width); |
| int height = mContext.getResources().getDimensionPixelSize( |
| android.R.dimen.notification_large_icon_height); |
| icon.setBounds(0, 0, width, height); |
| bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888); |
| icon.draw(new Canvas(bitmap)); |
| } |
| |
| // Configure the interface. Abort if any of these steps fails. |
| ParcelFileDescriptor tun = ParcelFileDescriptor.adoptFd( |
| jniConfigure(config.mtu, config.addresses, config.routes)); |
| try { |
| String interfaze = jniGetName(tun.getFd()); |
| if (mInterface != null && !mInterface.equals(interfaze)) { |
| jniReset(mInterface); |
| } |
| mInterface = interfaze; |
| } catch (RuntimeException e) { |
| try { |
| tun.close(); |
| } catch (Exception ex) { |
| // ignore |
| } |
| throw e; |
| } |
| |
| // Override DNS servers and search domains. |
| mCallback.override(config.dnsServers, config.searchDomains); |
| |
| // Fill more values. |
| config.packagz = mPackage; |
| config.interfaze = mInterface; |
| |
| // Show the notification! |
| showNotification(config, label, bitmap); |
| return tun; |
| } |
| |
| // INetworkManagementEventObserver.Stub |
| public void interfaceStatusChanged(String interfaze, boolean up) { |
| } |
| |
| // INetworkManagementEventObserver.Stub |
| public void interfaceLinkStateChanged(String interfaze, boolean up) { |
| } |
| |
| // INetworkManagementEventObserver.Stub |
| public void interfaceAdded(String interfaze) { |
| } |
| |
| // INetworkManagementEventObserver.Stub |
| public synchronized void interfaceRemoved(String interfaze) { |
| if (interfaze.equals(mInterface) && jniCheck(interfaze) == 0) { |
| mCallback.restore(); |
| hideNotification(); |
| mInterface = null; |
| } |
| } |
| |
| private void showNotification(VpnConfig config, String label, Bitmap icon) { |
| NotificationManager nm = (NotificationManager) |
| mContext.getSystemService(Context.NOTIFICATION_SERVICE); |
| |
| if (nm != null) { |
| String title = (label == null) ? mContext.getString(R.string.vpn_title) : |
| mContext.getString(R.string.vpn_title_long, label); |
| String text = (config.session == null) ? mContext.getString(R.string.vpn_text) : |
| mContext.getString(R.string.vpn_text_long, config.session); |
| |
| long identity = Binder.clearCallingIdentity(); |
| Notification notification = new Notification.Builder(mContext) |
| .setSmallIcon(R.drawable.vpn_connected) |
| .setLargeIcon(icon) |
| .setContentTitle(title) |
| .setContentText(text) |
| .setContentIntent(VpnConfig.getIntentForNotification(mContext, config)) |
| .setDefaults(Notification.DEFAULT_ALL) |
| .setOngoing(true) |
| .getNotification(); |
| nm.notify(R.drawable.vpn_connected, notification); |
| Binder.restoreCallingIdentity(identity); |
| } |
| } |
| |
| private void hideNotification() { |
| NotificationManager nm = (NotificationManager) |
| mContext.getSystemService(Context.NOTIFICATION_SERVICE); |
| |
| if (nm != null) { |
| long identity = Binder.clearCallingIdentity(); |
| nm.cancel(R.drawable.vpn_connected); |
| Binder.restoreCallingIdentity(identity); |
| } |
| } |
| |
| private native int jniConfigure(int mtu, String addresses, String routes); |
| private native String jniGetName(int tun); |
| private native void jniReset(String interfaze); |
| private native int jniCheck(String interfaze); |
| private native void jniProtect(int socket, String interfaze); |
| |
| /** |
| * Handle a legacy VPN request. This method stops the daemons and restart |
| * them if arguments are not null. Heavy things are offloaded to another |
| * thread, so callers will not be blocked for a long time. |
| * |
| * @param config The parameters to configure the network. |
| * @param raoocn The arguments to be passed to racoon. |
| * @param mtpd The arguments to be passed to mtpd. |
| */ |
| public synchronized void doLegacyVpn(VpnConfig config, String[] racoon, String[] mtpd) { |
| // Prepare for the new request. This also checks the caller. |
| prepare(null, VpnConfig.LEGACY_VPN); |
| |
| // Start a new runner and we are done! |
| mLegacyVpnRunner = new LegacyVpnRunner(config, racoon, mtpd); |
| mLegacyVpnRunner.start(); |
| } |
| |
| /** |
| * Bringing up a VPN connection takes time, and that is all this thread |
| * does. Here we have plenty of time. The only thing we need to take |
| * care of is responding to interruptions as soon as possible. Otherwise |
| * requests will be piled up. This can be done in a Handler as a state |
| * machine, but it is much easier to read in the current form. |
| */ |
| private class LegacyVpnRunner extends Thread { |
| private static final String TAG = "LegacyVpnRunner"; |
| private static final String NONE = "--"; |
| |
| private final VpnConfig mConfig; |
| private final String[] mDaemons; |
| private final String[][] mArguments; |
| private long mTimer = -1; |
| |
| public LegacyVpnRunner(VpnConfig config, String[] racoon, String[] mtpd) { |
| super(TAG); |
| mConfig = config; |
| mDaemons = new String[] {"racoon", "mtpd"}; |
| mArguments = new String[][] {racoon, mtpd}; |
| |
| mConfig.packagz = VpnConfig.LEGACY_VPN; |
| } |
| |
| public void exit() { |
| // We assume that everything is reset after the daemons die. |
| for (String daemon : mDaemons) { |
| SystemProperties.set("ctl.stop", daemon); |
| } |
| interrupt(); |
| } |
| |
| @Override |
| public void run() { |
| // Wait for the previous thread since it has been interrupted. |
| Log.v(TAG, "wait"); |
| synchronized (TAG) { |
| Log.v(TAG, "begin"); |
| execute(); |
| Log.v(TAG, "end"); |
| } |
| } |
| |
| private void checkpoint(boolean yield) throws InterruptedException { |
| long now = SystemClock.elapsedRealtime(); |
| if (mTimer == -1) { |
| mTimer = now; |
| Thread.sleep(1); |
| } else if (now - mTimer <= 30000) { |
| Thread.sleep(yield ? 200 : 1); |
| } else { |
| throw new InterruptedException("time is up"); |
| } |
| } |
| |
| private void execute() { |
| // Catch all exceptions so we can clean up few things. |
| try { |
| // Initialize the timer. |
| checkpoint(false); |
| |
| // First stop the daemons. |
| for (String daemon : mDaemons) { |
| SystemProperties.set("ctl.stop", daemon); |
| } |
| |
| // Wait for the daemons to stop. |
| for (String daemon : mDaemons) { |
| String key = "init.svc." + daemon; |
| while (!"stopped".equals(SystemProperties.get(key))) { |
| checkpoint(true); |
| } |
| } |
| |
| // Reset the properties. |
| SystemProperties.set("vpn.dns", NONE); |
| SystemProperties.set("vpn.via", NONE); |
| while (!NONE.equals(SystemProperties.get("vpn.dns")) || |
| !NONE.equals(SystemProperties.get("vpn.via"))) { |
| checkpoint(true); |
| } |
| |
| // Check if we need to restart any of the daemons. |
| boolean restart = false; |
| for (String[] arguments : mArguments) { |
| restart = restart || (arguments != null); |
| } |
| if (!restart) { |
| return; |
| } |
| |
| // Start the daemon with arguments. |
| for (int i = 0; i < mDaemons.length; ++i) { |
| String[] arguments = mArguments[i]; |
| if (arguments == null) { |
| continue; |
| } |
| |
| // Start the daemon. |
| String daemon = mDaemons[i]; |
| SystemProperties.set("ctl.start", daemon); |
| |
| // Wait for the daemon to start. |
| String key = "init.svc." + daemon; |
| while (!"running".equals(SystemProperties.get(key))) { |
| checkpoint(true); |
| } |
| |
| // Create the control socket. |
| LocalSocket socket = new LocalSocket(); |
| LocalSocketAddress address = new LocalSocketAddress( |
| daemon, LocalSocketAddress.Namespace.RESERVED); |
| |
| // Wait for the socket to connect. |
| while (true) { |
| try { |
| socket.connect(address); |
| break; |
| } catch (Exception e) { |
| // ignore |
| } |
| checkpoint(true); |
| } |
| socket.setSoTimeout(500); |
| |
| // Send over the arguments. |
| OutputStream out = socket.getOutputStream(); |
| for (String argument : arguments) { |
| byte[] bytes = argument.getBytes(Charsets.UTF_8); |
| if (bytes.length >= 0xFFFF) { |
| throw new IllegalArgumentException("argument is too large"); |
| } |
| out.write(bytes.length >> 8); |
| out.write(bytes.length); |
| out.write(bytes); |
| checkpoint(false); |
| } |
| |
| // Send End-Of-Arguments. |
| out.write(0xFF); |
| out.write(0xFF); |
| out.flush(); |
| socket.close(); |
| } |
| |
| // Now here is the beast from the old days. We check few |
| // properties to figure out the current status. Ideally we |
| // can read things back from the sockets and get rid of the |
| // properties, but we have no time... |
| while (NONE.equals(SystemProperties.get("vpn.dns")) || |
| NONE.equals(SystemProperties.get("vpn.via"))) { |
| |
| // Check if a running daemon is dead. |
| for (int i = 0; i < mDaemons.length; ++i) { |
| String daemon = mDaemons[i]; |
| if (mArguments[i] != null && !"running".equals( |
| SystemProperties.get("init.svc." + daemon))) { |
| throw new IllegalArgumentException(daemon + " is dead"); |
| } |
| } |
| checkpoint(true); |
| } |
| |
| // Now we are connected. Get the interface. |
| mConfig.interfaze = SystemProperties.get("vpn.via"); |
| |
| // Get the DNS servers if they are not set in config. |
| if (mConfig.dnsServers == null || mConfig.dnsServers.size() == 0) { |
| String dnsServers = SystemProperties.get("vpn.dns").trim(); |
| if (!dnsServers.isEmpty()) { |
| mConfig.dnsServers = Arrays.asList(dnsServers.split(" ")); |
| } |
| } |
| |
| // TODO: support search domains from ISAKMP mode config. |
| |
| // The final step must be synchronized. |
| synchronized (Vpn.this) { |
| // Check if the thread is interrupted while we are waiting. |
| checkpoint(false); |
| |
| // Check if the interface is gone while we are waiting. |
| if (jniCheck(mConfig.interfaze) == 0) { |
| throw new IllegalStateException(mConfig.interfaze + " is gone"); |
| } |
| |
| // Now INetworkManagementEventObserver is watching our back. |
| mInterface = mConfig.interfaze; |
| mCallback.override(mConfig.dnsServers, mConfig.searchDomains); |
| showNotification(mConfig, null, null); |
| } |
| Log.i(TAG, "Connected!"); |
| } catch (Exception e) { |
| Log.i(TAG, "Abort because " + e.getMessage()); |
| exit(); |
| } |
| } |
| } |
| } |