Vpn.java revision 03666c705ddabe0e7c5869ab69c2ca8b964164e9
1/* 2 * Copyright (C) 2011 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17package com.android.server.connectivity; 18 19import static android.Manifest.permission.BIND_VPN_SERVICE; 20 21import android.app.AppGlobals; 22import android.app.Notification; 23import android.app.NotificationManager; 24import android.app.PendingIntent; 25import android.content.BroadcastReceiver; 26import android.content.ComponentName; 27import android.content.Context; 28import android.content.Intent; 29import android.content.IntentFilter; 30import android.content.ServiceConnection; 31import android.content.pm.ApplicationInfo; 32import android.content.pm.PackageManager; 33import android.content.pm.PackageManager.NameNotFoundException; 34import android.content.pm.ResolveInfo; 35import android.content.pm.UserInfo; 36import android.graphics.Bitmap; 37import android.graphics.Canvas; 38import android.graphics.drawable.Drawable; 39import android.net.BaseNetworkStateTracker; 40import android.net.ConnectivityManager; 41import android.net.IConnectivityManager; 42import android.net.INetworkManagementEventObserver; 43import android.net.LinkAddress; 44import android.net.LinkProperties; 45import android.net.LocalSocket; 46import android.net.LocalSocketAddress; 47import android.net.NetworkAgent; 48import android.net.NetworkCapabilities; 49import android.net.NetworkInfo; 50import android.net.NetworkInfo.DetailedState; 51import android.net.NetworkUtils; 52import android.net.RouteInfo; 53import android.net.UidRange; 54import android.os.Binder; 55import android.os.FileUtils; 56import android.os.IBinder; 57import android.os.INetworkManagementService; 58import android.os.Looper; 59import android.os.Parcel; 60import android.os.ParcelFileDescriptor; 61import android.os.Process; 62import android.os.RemoteException; 63import android.os.SystemClock; 64import android.os.SystemService; 65import android.os.UserHandle; 66import android.os.UserManager; 67import android.security.Credentials; 68import android.security.KeyStore; 69import android.util.Log; 70import android.util.SparseBooleanArray; 71 72import com.android.internal.annotations.GuardedBy; 73import com.android.internal.R; 74import com.android.internal.net.LegacyVpnInfo; 75import com.android.internal.net.VpnConfig; 76import com.android.internal.net.VpnProfile; 77import com.android.server.net.BaseNetworkObserver; 78 79import java.io.File; 80import java.io.InputStream; 81import java.io.OutputStream; 82import java.net.InetAddress; 83import java.net.Inet4Address; 84import java.nio.charset.StandardCharsets; 85import java.util.ArrayList; 86import java.util.Arrays; 87import java.util.List; 88import java.util.concurrent.atomic.AtomicInteger; 89 90import libcore.io.IoUtils; 91 92/** 93 * @hide 94 */ 95public class Vpn { 96 private static final String NETWORKTYPE = "VPN"; 97 private static final String TAG = "Vpn"; 98 private static final boolean LOGD = true; 99 100 // TODO: create separate trackers for each unique VPN to support 101 // automated reconnection 102 103 private Context mContext; 104 private NetworkInfo mNetworkInfo; 105 private String mPackage; 106 private int mOwnerUID; 107 private String mInterface; 108 private Connection mConnection; 109 private LegacyVpnRunner mLegacyVpnRunner; 110 private PendingIntent mStatusIntent; 111 private volatile boolean mEnableNotif = true; 112 private volatile boolean mEnableTeardown = true; 113 private final IConnectivityManager mConnService; 114 private final INetworkManagementService mNetd; 115 private VpnConfig mConfig; 116 private NetworkAgent mNetworkAgent; 117 private final Looper mLooper; 118 private final NetworkCapabilities mNetworkCapabilities; 119 120 /* list of users using this VPN. */ 121 @GuardedBy("this") 122 private List<UidRange> mVpnUsers = null; 123 private BroadcastReceiver mUserIntentReceiver = null; 124 125 private final int mUserId; 126 127 public Vpn(Looper looper, Context context, INetworkManagementService netService, 128 IConnectivityManager connService, int userId) { 129 mContext = context; 130 mNetd = netService; 131 mConnService = connService; 132 mUserId = userId; 133 mLooper = looper; 134 135 mPackage = VpnConfig.LEGACY_VPN; 136 mOwnerUID = getAppUid(mPackage); 137 138 try { 139 netService.registerObserver(mObserver); 140 } catch (RemoteException e) { 141 Log.wtf(TAG, "Problem registering observer", e); 142 } 143 if (userId == UserHandle.USER_OWNER) { 144 // Owner's VPN also needs to handle restricted users 145 mUserIntentReceiver = new BroadcastReceiver() { 146 @Override 147 public void onReceive(Context context, Intent intent) { 148 final String action = intent.getAction(); 149 final int userId = intent.getIntExtra(Intent.EXTRA_USER_HANDLE, 150 UserHandle.USER_NULL); 151 if (userId == UserHandle.USER_NULL) return; 152 153 if (Intent.ACTION_USER_ADDED.equals(action)) { 154 onUserAdded(userId); 155 } else if (Intent.ACTION_USER_REMOVED.equals(action)) { 156 onUserRemoved(userId); 157 } 158 } 159 }; 160 161 IntentFilter intentFilter = new IntentFilter(); 162 intentFilter.addAction(Intent.ACTION_USER_ADDED); 163 intentFilter.addAction(Intent.ACTION_USER_REMOVED); 164 mContext.registerReceiverAsUser( 165 mUserIntentReceiver, UserHandle.ALL, intentFilter, null, null); 166 } 167 168 mNetworkInfo = new NetworkInfo(ConnectivityManager.TYPE_VPN, 0, NETWORKTYPE, ""); 169 // TODO: Copy metered attribute and bandwidths from physical transport, b/16207332 170 mNetworkCapabilities = new NetworkCapabilities(); 171 mNetworkCapabilities.addTransportType(NetworkCapabilities.TRANSPORT_VPN); 172 mNetworkCapabilities.removeCapability(NetworkCapabilities.NET_CAPABILITY_NOT_VPN); 173 } 174 175 /** 176 * Set if this object is responsible for showing its own notifications. When 177 * {@code false}, notifications are handled externally by someone else. 178 */ 179 public void setEnableNotifications(boolean enableNotif) { 180 mEnableNotif = enableNotif; 181 } 182 183 /** 184 * Set if this object is responsible for watching for {@link NetworkInfo} 185 * teardown. When {@code false}, teardown is handled externally by someone 186 * else. 187 */ 188 public void setEnableTeardown(boolean enableTeardown) { 189 mEnableTeardown = enableTeardown; 190 } 191 192 /** 193 * Update current state, dispaching event to listeners. 194 */ 195 private void updateState(DetailedState detailedState, String reason) { 196 if (LOGD) Log.d(TAG, "setting state=" + detailedState + ", reason=" + reason); 197 mNetworkInfo.setDetailedState(detailedState, reason, null); 198 if (mNetworkAgent != null) { 199 mNetworkAgent.sendNetworkInfo(mNetworkInfo); 200 } 201 } 202 203 /** 204 * Prepare for a VPN application. This method is designed to solve 205 * race conditions. It first compares the current prepared package 206 * with {@code oldPackage}. If they are the same, the prepared 207 * package is revoked and replaced with {@code newPackage}. If 208 * {@code oldPackage} is {@code null}, the comparison is omitted. 209 * If {@code newPackage} is the same package or {@code null}, the 210 * revocation is omitted. This method returns {@code true} if the 211 * operation is succeeded. 212 * 213 * Legacy VPN is handled specially since it is not a real package. 214 * It uses {@link VpnConfig#LEGACY_VPN} as its package name, and 215 * it can be revoked by itself. 216 * 217 * @param oldPackage The package name of the old VPN application. 218 * @param newPackage The package name of the new VPN application. 219 * @return true if the operation is succeeded. 220 */ 221 public synchronized boolean prepare(String oldPackage, String newPackage) { 222 // Return false if the package does not match. 223 if (oldPackage != null && !oldPackage.equals(mPackage)) { 224 return false; 225 } 226 227 // Return true if we do not need to revoke. 228 if (newPackage == null || 229 (newPackage.equals(mPackage) && !newPackage.equals(VpnConfig.LEGACY_VPN))) { 230 return true; 231 } 232 233 // Check if the caller is authorized. 234 enforceControlPermission(); 235 236 // Reset the interface and hide the notification. 237 if (mInterface != null) { 238 for (UidRange uidRange : mVpnUsers) { 239 hideNotification(uidRange.getStartUser()); 240 } 241 agentDisconnect(); 242 jniReset(mInterface); 243 mInterface = null; 244 mVpnUsers = null; 245 } 246 247 // Revoke the connection or stop LegacyVpnRunner. 248 if (mConnection != null) { 249 try { 250 mConnection.mService.transact(IBinder.LAST_CALL_TRANSACTION, 251 Parcel.obtain(), null, IBinder.FLAG_ONEWAY); 252 } catch (Exception e) { 253 // ignore 254 } 255 mContext.unbindService(mConnection); 256 mConnection = null; 257 } else if (mLegacyVpnRunner != null) { 258 mLegacyVpnRunner.exit(); 259 mLegacyVpnRunner = null; 260 } 261 262 long token = Binder.clearCallingIdentity(); 263 try { 264 mNetd.denyProtect(mOwnerUID); 265 } catch (Exception e) { 266 Log.wtf(TAG, "Failed to disallow UID " + mOwnerUID + " to call protect() " + e); 267 } finally { 268 Binder.restoreCallingIdentity(token); 269 } 270 271 Log.i(TAG, "Switched from " + mPackage + " to " + newPackage); 272 mPackage = newPackage; 273 mOwnerUID = getAppUid(newPackage); 274 token = Binder.clearCallingIdentity(); 275 try { 276 mNetd.allowProtect(mOwnerUID); 277 } catch (Exception e) { 278 Log.wtf(TAG, "Failed to allow UID " + mOwnerUID + " to call protect() " + e); 279 } finally { 280 Binder.restoreCallingIdentity(token); 281 } 282 mConfig = null; 283 updateState(DetailedState.IDLE, "prepare"); 284 return true; 285 } 286 287 private int getAppUid(String app) { 288 if (app == VpnConfig.LEGACY_VPN) { 289 return Process.myUid(); 290 } 291 PackageManager pm = mContext.getPackageManager(); 292 int result; 293 try { 294 result = pm.getPackageUid(app, mUserId); 295 } catch (NameNotFoundException e) { 296 result = -1; 297 } 298 return result; 299 } 300 301 public NetworkInfo getNetworkInfo() { 302 return mNetworkInfo; 303 } 304 305 private void agentConnect() { 306 LinkProperties lp = new LinkProperties(); 307 lp.setInterfaceName(mInterface); 308 boolean hasDefaultRoute = false; 309 for (RouteInfo route : mConfig.routes) { 310 lp.addRoute(route); 311 if (route.isDefaultRoute()) hasDefaultRoute = true; 312 } 313 if (hasDefaultRoute) { 314 mNetworkCapabilities.addCapability(NetworkCapabilities.NET_CAPABILITY_INTERNET); 315 } else { 316 mNetworkCapabilities.removeCapability(NetworkCapabilities.NET_CAPABILITY_INTERNET); 317 } 318 if (mConfig.dnsServers != null) { 319 for (String dnsServer : mConfig.dnsServers) { 320 lp.addDnsServer(InetAddress.parseNumericAddress(dnsServer)); 321 } 322 } 323 // Concatenate search domains into a string. 324 StringBuilder buffer = new StringBuilder(); 325 if (mConfig.searchDomains != null) { 326 for (String domain : mConfig.searchDomains) { 327 buffer.append(domain).append(' '); 328 } 329 } 330 lp.setDomains(buffer.toString().trim()); 331 mNetworkInfo.setIsAvailable(true); 332 mNetworkInfo.setDetailedState(DetailedState.CONNECTED, null, null); 333 long token = Binder.clearCallingIdentity(); 334 try { 335 mNetworkAgent = new NetworkAgent(mLooper, mContext, NETWORKTYPE, 336 mNetworkInfo, mNetworkCapabilities, lp, 0) { 337 public void unwanted() { 338 // We are user controlled, not driven by NetworkRequest. 339 }; 340 }; 341 } finally { 342 Binder.restoreCallingIdentity(token); 343 } 344 addVpnUserLocked(mUserId); 345 // If we are owner assign all Restricted Users to this VPN 346 if (mUserId == UserHandle.USER_OWNER) { 347 token = Binder.clearCallingIdentity(); 348 List<UserInfo> users; 349 try { 350 users = UserManager.get(mContext).getUsers(); 351 } finally { 352 Binder.restoreCallingIdentity(token); 353 } 354 for (UserInfo user : users) { 355 if (user.isRestricted()) { 356 addVpnUserLocked(user.id); 357 } 358 } 359 } 360 mNetworkAgent.addUidRanges(mVpnUsers.toArray(new UidRange[mVpnUsers.size()])); 361 } 362 363 private void agentDisconnect(NetworkInfo networkInfo, NetworkAgent networkAgent) { 364 networkInfo.setIsAvailable(false); 365 networkInfo.setDetailedState(DetailedState.DISCONNECTED, null, null); 366 if (networkAgent != null) { 367 networkAgent.sendNetworkInfo(networkInfo); 368 } 369 } 370 371 private void agentDisconnect(NetworkAgent networkAgent) { 372 NetworkInfo networkInfo = new NetworkInfo(mNetworkInfo); 373 agentDisconnect(networkInfo, networkAgent); 374 } 375 376 private void agentDisconnect() { 377 if (mNetworkInfo.isConnected()) { 378 agentDisconnect(mNetworkInfo, mNetworkAgent); 379 mNetworkAgent = null; 380 } 381 } 382 383 /** 384 * Establish a VPN network and return the file descriptor of the VPN 385 * interface. This methods returns {@code null} if the application is 386 * revoked or not prepared. 387 * 388 * @param config The parameters to configure the network. 389 * @return The file descriptor of the VPN interface. 390 */ 391 public synchronized ParcelFileDescriptor establish(VpnConfig config) { 392 // Check if the caller is already prepared. 393 UserManager mgr = UserManager.get(mContext); 394 if (Binder.getCallingUid() != mOwnerUID) { 395 return null; 396 } 397 // Check if the service is properly declared. 398 Intent intent = new Intent(VpnConfig.SERVICE_INTERFACE); 399 intent.setClassName(mPackage, config.user); 400 long token = Binder.clearCallingIdentity(); 401 try { 402 // Restricted users are not allowed to create VPNs, they are tied to Owner 403 UserInfo user = mgr.getUserInfo(mUserId); 404 if (user.isRestricted() || mgr.hasUserRestriction(UserManager.DISALLOW_CONFIG_VPN)) { 405 throw new SecurityException("Restricted users cannot establish VPNs"); 406 } 407 408 ResolveInfo info = AppGlobals.getPackageManager().resolveService(intent, 409 null, 0, mUserId); 410 if (info == null) { 411 throw new SecurityException("Cannot find " + config.user); 412 } 413 if (!BIND_VPN_SERVICE.equals(info.serviceInfo.permission)) { 414 throw new SecurityException(config.user + " does not require " + BIND_VPN_SERVICE); 415 } 416 } catch (RemoteException e) { 417 throw new SecurityException("Cannot find " + config.user); 418 } finally { 419 Binder.restoreCallingIdentity(token); 420 } 421 422 // Save the old config in case we need to go back. 423 VpnConfig oldConfig = mConfig; 424 String oldInterface = mInterface; 425 Connection oldConnection = mConnection; 426 NetworkAgent oldNetworkAgent = mNetworkAgent; 427 mNetworkAgent = null; 428 List<UidRange> oldUsers = mVpnUsers; 429 430 // Configure the interface. Abort if any of these steps fails. 431 ParcelFileDescriptor tun = ParcelFileDescriptor.adoptFd(jniCreate(config.mtu)); 432 try { 433 updateState(DetailedState.CONNECTING, "establish"); 434 String interfaze = jniGetName(tun.getFd()); 435 436 // TEMP use the old jni calls until there is support for netd address setting 437 StringBuilder builder = new StringBuilder(); 438 for (LinkAddress address : config.addresses) { 439 builder.append(" " + address); 440 } 441 if (jniSetAddresses(interfaze, builder.toString()) < 1) { 442 throw new IllegalArgumentException("At least one address must be specified"); 443 } 444 Connection connection = new Connection(); 445 if (!mContext.bindServiceAsUser(intent, connection, Context.BIND_AUTO_CREATE, 446 new UserHandle(mUserId))) { 447 throw new IllegalStateException("Cannot bind " + config.user); 448 } 449 450 mConnection = connection; 451 mInterface = interfaze; 452 453 // Fill more values. 454 config.user = mPackage; 455 config.interfaze = mInterface; 456 config.startTime = SystemClock.elapsedRealtime(); 457 mConfig = config; 458 459 // Set up forwarding and DNS rules. 460 mVpnUsers = new ArrayList<UidRange>(); 461 agentConnect(); 462 463 if (oldConnection != null) { 464 mContext.unbindService(oldConnection); 465 } 466 // Remove the old tun's user forwarding rules 467 // The new tun's user rules have already been added so they will take over 468 // as rules are deleted. This prevents data leakage as the rules are moved over. 469 agentDisconnect(oldNetworkAgent); 470 if (oldInterface != null && !oldInterface.equals(interfaze)) { 471 jniReset(oldInterface); 472 } 473 } catch (RuntimeException e) { 474 IoUtils.closeQuietly(tun); 475 agentDisconnect(); 476 // restore old state 477 mConfig = oldConfig; 478 mConnection = oldConnection; 479 mVpnUsers = oldUsers; 480 mNetworkAgent = oldNetworkAgent; 481 mInterface = oldInterface; 482 throw e; 483 } 484 Log.i(TAG, "Established by " + config.user + " on " + mInterface); 485 486 // TODO: ensure that contract class eventually marks as connected 487 updateState(DetailedState.AUTHENTICATING, "establish"); 488 return tun; 489 } 490 491 private boolean isRunningLocked() { 492 return mVpnUsers != null; 493 } 494 495 // Note: This function adds to mVpnUsers but does not publish list to NetworkAgent. 496 private void addVpnUserLocked(int user) { 497 if (!isRunningLocked()) { 498 throw new IllegalStateException("VPN is not active"); 499 } 500 501 // add the user 502 mVpnUsers.add(UidRange.createForUser(user)); 503 504 // show the notification 505 if (!mPackage.equals(VpnConfig.LEGACY_VPN)) { 506 // Load everything for the user's notification 507 PackageManager pm = mContext.getPackageManager(); 508 ApplicationInfo app = null; 509 final long token = Binder.clearCallingIdentity(); 510 try { 511 app = AppGlobals.getPackageManager().getApplicationInfo(mPackage, 0, mUserId); 512 } catch (RemoteException e) { 513 throw new IllegalStateException("Invalid application"); 514 } finally { 515 Binder.restoreCallingIdentity(token); 516 } 517 String label = app.loadLabel(pm).toString(); 518 // Load the icon and convert it into a bitmap. 519 Drawable icon = app.loadIcon(pm); 520 Bitmap bitmap = null; 521 if (icon.getIntrinsicWidth() > 0 && icon.getIntrinsicHeight() > 0) { 522 int width = mContext.getResources().getDimensionPixelSize( 523 android.R.dimen.notification_large_icon_width); 524 int height = mContext.getResources().getDimensionPixelSize( 525 android.R.dimen.notification_large_icon_height); 526 icon.setBounds(0, 0, width, height); 527 bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888); 528 Canvas c = new Canvas(bitmap); 529 icon.draw(c); 530 c.setBitmap(null); 531 } 532 showNotification(label, bitmap, user); 533 } else { 534 showNotification(null, null, user); 535 } 536 } 537 538 private void removeVpnUserLocked(int user) { 539 if (!isRunningLocked()) { 540 throw new IllegalStateException("VPN is not active"); 541 } 542 UidRange uidRange = UidRange.createForUser(user); 543 if (mNetworkAgent != null) { 544 mNetworkAgent.removeUidRanges(new UidRange[] { uidRange }); 545 } 546 mVpnUsers.remove(uidRange); 547 hideNotification(user); 548 } 549 550 private void onUserAdded(int userId) { 551 // If the user is restricted tie them to the owner's VPN 552 synchronized(Vpn.this) { 553 UserManager mgr = UserManager.get(mContext); 554 UserInfo user = mgr.getUserInfo(userId); 555 if (user.isRestricted()) { 556 try { 557 addVpnUserLocked(userId); 558 if (mNetworkAgent != null) { 559 UidRange uidRange = UidRange.createForUser(userId); 560 mNetworkAgent.addUidRanges(new UidRange[] { uidRange }); 561 } 562 } catch (Exception e) { 563 Log.wtf(TAG, "Failed to add restricted user to owner", e); 564 } 565 } 566 } 567 } 568 569 private void onUserRemoved(int userId) { 570 // clean up if restricted 571 synchronized(Vpn.this) { 572 UserManager mgr = UserManager.get(mContext); 573 UserInfo user = mgr.getUserInfo(userId); 574 if (user.isRestricted()) { 575 try { 576 removeVpnUserLocked(userId); 577 } catch (Exception e) { 578 Log.wtf(TAG, "Failed to remove restricted user to owner", e); 579 } 580 } 581 } 582 } 583 584 /** 585 * Return the configuration of the currently running VPN. 586 */ 587 public VpnConfig getVpnConfig() { 588 enforceControlPermission(); 589 return mConfig; 590 } 591 592 @Deprecated 593 public synchronized void interfaceStatusChanged(String iface, boolean up) { 594 try { 595 mObserver.interfaceStatusChanged(iface, up); 596 } catch (RemoteException e) { 597 // ignored; target is local 598 } 599 } 600 601 private INetworkManagementEventObserver mObserver = new BaseNetworkObserver() { 602 @Override 603 public void interfaceStatusChanged(String interfaze, boolean up) { 604 synchronized (Vpn.this) { 605 if (!up && mLegacyVpnRunner != null) { 606 mLegacyVpnRunner.check(interfaze); 607 } 608 } 609 } 610 611 @Override 612 public void interfaceRemoved(String interfaze) { 613 synchronized (Vpn.this) { 614 if (interfaze.equals(mInterface) && jniCheck(interfaze) == 0) { 615 for (UidRange uidRange : mVpnUsers) { 616 hideNotification(uidRange.getStartUser()); 617 } 618 mVpnUsers = null; 619 mInterface = null; 620 if (mConnection != null) { 621 mContext.unbindService(mConnection); 622 mConnection = null; 623 agentDisconnect(); 624 } else if (mLegacyVpnRunner != null) { 625 mLegacyVpnRunner.exit(); 626 mLegacyVpnRunner = null; 627 } 628 } 629 } 630 } 631 }; 632 633 private void enforceControlPermission() { 634 // System user is allowed to control VPN. 635 if (Binder.getCallingUid() == Process.SYSTEM_UID) { 636 return; 637 } 638 int appId = UserHandle.getAppId(Binder.getCallingUid()); 639 final long token = Binder.clearCallingIdentity(); 640 try { 641 // System VPN dialogs are also allowed to control VPN. 642 PackageManager pm = mContext.getPackageManager(); 643 ApplicationInfo app = pm.getApplicationInfo(VpnConfig.DIALOGS_PACKAGE, 0); 644 if (((app.flags & ApplicationInfo.FLAG_SYSTEM) != 0) && (appId == app.uid)) { 645 return; 646 } 647 } catch (Exception e) { 648 // ignore 649 } finally { 650 Binder.restoreCallingIdentity(token); 651 } 652 653 throw new SecurityException("Unauthorized Caller"); 654 } 655 656 private class Connection implements ServiceConnection { 657 private IBinder mService; 658 659 @Override 660 public void onServiceConnected(ComponentName name, IBinder service) { 661 mService = service; 662 } 663 664 @Override 665 public void onServiceDisconnected(ComponentName name) { 666 mService = null; 667 } 668 } 669 670 private void showNotification(String label, Bitmap icon, int user) { 671 if (!mEnableNotif) return; 672 final long token = Binder.clearCallingIdentity(); 673 try { 674 mStatusIntent = VpnConfig.getIntentForStatusPanel(mContext); 675 676 NotificationManager nm = (NotificationManager) 677 mContext.getSystemService(Context.NOTIFICATION_SERVICE); 678 679 if (nm != null) { 680 String title = (label == null) ? mContext.getString(R.string.vpn_title) : 681 mContext.getString(R.string.vpn_title_long, label); 682 String text = (mConfig.session == null) ? mContext.getString(R.string.vpn_text) : 683 mContext.getString(R.string.vpn_text_long, mConfig.session); 684 685 Notification notification = new Notification.Builder(mContext) 686 .setSmallIcon(R.drawable.vpn_connected) 687 .setLargeIcon(icon) 688 .setContentTitle(title) 689 .setContentText(text) 690 .setContentIntent(mStatusIntent) 691 .setDefaults(0) 692 .setOngoing(true) 693 .build(); 694 nm.notifyAsUser(null, R.drawable.vpn_connected, notification, new UserHandle(user)); 695 } 696 } finally { 697 Binder.restoreCallingIdentity(token); 698 } 699 } 700 701 private void hideNotification(int user) { 702 if (!mEnableNotif) return; 703 mStatusIntent = null; 704 705 NotificationManager nm = (NotificationManager) 706 mContext.getSystemService(Context.NOTIFICATION_SERVICE); 707 708 if (nm != null) { 709 final long token = Binder.clearCallingIdentity(); 710 try { 711 nm.cancelAsUser(null, R.drawable.vpn_connected, new UserHandle(user)); 712 } finally { 713 Binder.restoreCallingIdentity(token); 714 } 715 } 716 } 717 718 private native int jniCreate(int mtu); 719 private native String jniGetName(int tun); 720 private native int jniSetAddresses(String interfaze, String addresses); 721 private native void jniReset(String interfaze); 722 private native int jniCheck(String interfaze); 723 724 private static RouteInfo findIPv4DefaultRoute(LinkProperties prop) { 725 for (RouteInfo route : prop.getAllRoutes()) { 726 // Currently legacy VPN only works on IPv4. 727 if (route.isDefaultRoute() && route.getGateway() instanceof Inet4Address) { 728 return route; 729 } 730 } 731 732 throw new IllegalStateException("Unable to find IPv4 default gateway"); 733 } 734 735 /** 736 * Start legacy VPN, controlling native daemons as needed. Creates a 737 * secondary thread to perform connection work, returning quickly. 738 */ 739 public void startLegacyVpn(VpnProfile profile, KeyStore keyStore, LinkProperties egress) { 740 enforceControlPermission(); 741 if (!keyStore.isUnlocked()) { 742 throw new IllegalStateException("KeyStore isn't unlocked"); 743 } 744 UserManager mgr = UserManager.get(mContext); 745 UserInfo user = mgr.getUserInfo(mUserId); 746 if (user.isRestricted() || mgr.hasUserRestriction(UserManager.DISALLOW_CONFIG_VPN)) { 747 throw new SecurityException("Restricted users cannot establish VPNs"); 748 } 749 750 final RouteInfo ipv4DefaultRoute = findIPv4DefaultRoute(egress); 751 final String gateway = ipv4DefaultRoute.getGateway().getHostAddress(); 752 final String iface = ipv4DefaultRoute.getInterface(); 753 754 // Load certificates. 755 String privateKey = ""; 756 String userCert = ""; 757 String caCert = ""; 758 String serverCert = ""; 759 if (!profile.ipsecUserCert.isEmpty()) { 760 privateKey = Credentials.USER_PRIVATE_KEY + profile.ipsecUserCert; 761 byte[] value = keyStore.get(Credentials.USER_CERTIFICATE + profile.ipsecUserCert); 762 userCert = (value == null) ? null : new String(value, StandardCharsets.UTF_8); 763 } 764 if (!profile.ipsecCaCert.isEmpty()) { 765 byte[] value = keyStore.get(Credentials.CA_CERTIFICATE + profile.ipsecCaCert); 766 caCert = (value == null) ? null : new String(value, StandardCharsets.UTF_8); 767 } 768 if (!profile.ipsecServerCert.isEmpty()) { 769 byte[] value = keyStore.get(Credentials.USER_CERTIFICATE + profile.ipsecServerCert); 770 serverCert = (value == null) ? null : new String(value, StandardCharsets.UTF_8); 771 } 772 if (privateKey == null || userCert == null || caCert == null || serverCert == null) { 773 throw new IllegalStateException("Cannot load credentials"); 774 } 775 776 // Prepare arguments for racoon. 777 String[] racoon = null; 778 switch (profile.type) { 779 case VpnProfile.TYPE_L2TP_IPSEC_PSK: 780 racoon = new String[] { 781 iface, profile.server, "udppsk", profile.ipsecIdentifier, 782 profile.ipsecSecret, "1701", 783 }; 784 break; 785 case VpnProfile.TYPE_L2TP_IPSEC_RSA: 786 racoon = new String[] { 787 iface, profile.server, "udprsa", privateKey, userCert, 788 caCert, serverCert, "1701", 789 }; 790 break; 791 case VpnProfile.TYPE_IPSEC_XAUTH_PSK: 792 racoon = new String[] { 793 iface, profile.server, "xauthpsk", profile.ipsecIdentifier, 794 profile.ipsecSecret, profile.username, profile.password, "", gateway, 795 }; 796 break; 797 case VpnProfile.TYPE_IPSEC_XAUTH_RSA: 798 racoon = new String[] { 799 iface, profile.server, "xauthrsa", privateKey, userCert, 800 caCert, serverCert, profile.username, profile.password, "", gateway, 801 }; 802 break; 803 case VpnProfile.TYPE_IPSEC_HYBRID_RSA: 804 racoon = new String[] { 805 iface, profile.server, "hybridrsa", 806 caCert, serverCert, profile.username, profile.password, "", gateway, 807 }; 808 break; 809 } 810 811 // Prepare arguments for mtpd. 812 String[] mtpd = null; 813 switch (profile.type) { 814 case VpnProfile.TYPE_PPTP: 815 mtpd = new String[] { 816 iface, "pptp", profile.server, "1723", 817 "name", profile.username, "password", profile.password, 818 "linkname", "vpn", "refuse-eap", "nodefaultroute", 819 "usepeerdns", "idle", "1800", "mtu", "1400", "mru", "1400", 820 (profile.mppe ? "+mppe" : "nomppe"), 821 }; 822 break; 823 case VpnProfile.TYPE_L2TP_IPSEC_PSK: 824 case VpnProfile.TYPE_L2TP_IPSEC_RSA: 825 mtpd = new String[] { 826 iface, "l2tp", profile.server, "1701", profile.l2tpSecret, 827 "name", profile.username, "password", profile.password, 828 "linkname", "vpn", "refuse-eap", "nodefaultroute", 829 "usepeerdns", "idle", "1800", "mtu", "1400", "mru", "1400", 830 }; 831 break; 832 } 833 834 VpnConfig config = new VpnConfig(); 835 config.legacy = true; 836 config.user = profile.key; 837 config.interfaze = iface; 838 config.session = profile.name; 839 840 config.addLegacyRoutes(profile.routes); 841 if (!profile.dnsServers.isEmpty()) { 842 config.dnsServers = Arrays.asList(profile.dnsServers.split(" +")); 843 } 844 if (!profile.searchDomains.isEmpty()) { 845 config.searchDomains = Arrays.asList(profile.searchDomains.split(" +")); 846 } 847 startLegacyVpn(config, racoon, mtpd); 848 } 849 850 private synchronized void startLegacyVpn(VpnConfig config, String[] racoon, String[] mtpd) { 851 stopLegacyVpn(); 852 853 // Prepare for the new request. This also checks the caller. 854 prepare(null, VpnConfig.LEGACY_VPN); 855 updateState(DetailedState.CONNECTING, "startLegacyVpn"); 856 857 // Start a new LegacyVpnRunner and we are done! 858 mLegacyVpnRunner = new LegacyVpnRunner(config, racoon, mtpd); 859 mLegacyVpnRunner.start(); 860 } 861 862 public synchronized void stopLegacyVpn() { 863 if (mLegacyVpnRunner != null) { 864 mLegacyVpnRunner.exit(); 865 mLegacyVpnRunner = null; 866 867 synchronized (LegacyVpnRunner.TAG) { 868 // wait for old thread to completely finish before spinning up 869 // new instance, otherwise state updates can be out of order. 870 } 871 } 872 } 873 874 /** 875 * Return the information of the current ongoing legacy VPN. 876 */ 877 public synchronized LegacyVpnInfo getLegacyVpnInfo() { 878 // Check if the caller is authorized. 879 enforceControlPermission(); 880 if (mLegacyVpnRunner == null) return null; 881 882 final LegacyVpnInfo info = new LegacyVpnInfo(); 883 info.key = mConfig.user; 884 info.state = LegacyVpnInfo.stateFromNetworkInfo(mNetworkInfo); 885 if (mNetworkInfo.isConnected()) { 886 info.intent = mStatusIntent; 887 } 888 return info; 889 } 890 891 public VpnConfig getLegacyVpnConfig() { 892 if (mLegacyVpnRunner != null) { 893 return mConfig; 894 } else { 895 return null; 896 } 897 } 898 899 /** 900 * Bringing up a VPN connection takes time, and that is all this thread 901 * does. Here we have plenty of time. The only thing we need to take 902 * care of is responding to interruptions as soon as possible. Otherwise 903 * requests will be piled up. This can be done in a Handler as a state 904 * machine, but it is much easier to read in the current form. 905 */ 906 private class LegacyVpnRunner extends Thread { 907 private static final String TAG = "LegacyVpnRunner"; 908 909 private final String[] mDaemons; 910 private final String[][] mArguments; 911 private final LocalSocket[] mSockets; 912 private final String mOuterInterface; 913 private final AtomicInteger mOuterConnection = 914 new AtomicInteger(ConnectivityManager.TYPE_NONE); 915 916 private long mTimer = -1; 917 918 /** 919 * Watch for the outer connection (passing in the constructor) going away. 920 */ 921 private final BroadcastReceiver mBroadcastReceiver = new BroadcastReceiver() { 922 @Override 923 public void onReceive(Context context, Intent intent) { 924 if (!mEnableTeardown) return; 925 926 if (intent.getAction().equals(ConnectivityManager.CONNECTIVITY_ACTION)) { 927 if (intent.getIntExtra(ConnectivityManager.EXTRA_NETWORK_TYPE, 928 ConnectivityManager.TYPE_NONE) == mOuterConnection.get()) { 929 NetworkInfo info = (NetworkInfo)intent.getExtra( 930 ConnectivityManager.EXTRA_NETWORK_INFO); 931 if (info != null && !info.isConnectedOrConnecting()) { 932 try { 933 mObserver.interfaceStatusChanged(mOuterInterface, false); 934 } catch (RemoteException e) {} 935 } 936 } 937 } 938 } 939 }; 940 941 public LegacyVpnRunner(VpnConfig config, String[] racoon, String[] mtpd) { 942 super(TAG); 943 mConfig = config; 944 mDaemons = new String[] {"racoon", "mtpd"}; 945 // TODO: clear arguments from memory once launched 946 mArguments = new String[][] {racoon, mtpd}; 947 mSockets = new LocalSocket[mDaemons.length]; 948 949 // This is the interface which VPN is running on, 950 // mConfig.interfaze will change to point to OUR 951 // internal interface soon. TODO - add inner/outer to mconfig 952 // TODO - we have a race - if the outer iface goes away/disconnects before we hit this 953 // we will leave the VPN up. We should check that it's still there/connected after 954 // registering 955 mOuterInterface = mConfig.interfaze; 956 957 try { 958 mOuterConnection.set( 959 mConnService.findConnectionTypeForIface(mOuterInterface)); 960 } catch (Exception e) { 961 mOuterConnection.set(ConnectivityManager.TYPE_NONE); 962 } 963 964 IntentFilter filter = new IntentFilter(); 965 filter.addAction(ConnectivityManager.CONNECTIVITY_ACTION); 966 mContext.registerReceiver(mBroadcastReceiver, filter); 967 } 968 969 public void check(String interfaze) { 970 if (interfaze.equals(mOuterInterface)) { 971 Log.i(TAG, "Legacy VPN is going down with " + interfaze); 972 exit(); 973 } 974 } 975 976 public void exit() { 977 // We assume that everything is reset after stopping the daemons. 978 interrupt(); 979 for (LocalSocket socket : mSockets) { 980 IoUtils.closeQuietly(socket); 981 } 982 agentDisconnect(); 983 try { 984 mContext.unregisterReceiver(mBroadcastReceiver); 985 } catch (IllegalArgumentException e) {} 986 } 987 988 @Override 989 public void run() { 990 // Wait for the previous thread since it has been interrupted. 991 Log.v(TAG, "Waiting"); 992 synchronized (TAG) { 993 Log.v(TAG, "Executing"); 994 execute(); 995 monitorDaemons(); 996 } 997 } 998 999 private void checkpoint(boolean yield) throws InterruptedException { 1000 long now = SystemClock.elapsedRealtime(); 1001 if (mTimer == -1) { 1002 mTimer = now; 1003 Thread.sleep(1); 1004 } else if (now - mTimer <= 60000) { 1005 Thread.sleep(yield ? 200 : 1); 1006 } else { 1007 updateState(DetailedState.FAILED, "checkpoint"); 1008 throw new IllegalStateException("Time is up"); 1009 } 1010 } 1011 1012 private void execute() { 1013 // Catch all exceptions so we can clean up few things. 1014 boolean initFinished = false; 1015 try { 1016 // Initialize the timer. 1017 checkpoint(false); 1018 1019 // Wait for the daemons to stop. 1020 for (String daemon : mDaemons) { 1021 while (!SystemService.isStopped(daemon)) { 1022 checkpoint(true); 1023 } 1024 } 1025 1026 // Clear the previous state. 1027 File state = new File("/data/misc/vpn/state"); 1028 state.delete(); 1029 if (state.exists()) { 1030 throw new IllegalStateException("Cannot delete the state"); 1031 } 1032 new File("/data/misc/vpn/abort").delete(); 1033 initFinished = true; 1034 1035 // Check if we need to restart any of the daemons. 1036 boolean restart = false; 1037 for (String[] arguments : mArguments) { 1038 restart = restart || (arguments != null); 1039 } 1040 if (!restart) { 1041 agentDisconnect(); 1042 return; 1043 } 1044 updateState(DetailedState.CONNECTING, "execute"); 1045 1046 // Start the daemon with arguments. 1047 for (int i = 0; i < mDaemons.length; ++i) { 1048 String[] arguments = mArguments[i]; 1049 if (arguments == null) { 1050 continue; 1051 } 1052 1053 // Start the daemon. 1054 String daemon = mDaemons[i]; 1055 SystemService.start(daemon); 1056 1057 // Wait for the daemon to start. 1058 while (!SystemService.isRunning(daemon)) { 1059 checkpoint(true); 1060 } 1061 1062 // Create the control socket. 1063 mSockets[i] = new LocalSocket(); 1064 LocalSocketAddress address = new LocalSocketAddress( 1065 daemon, LocalSocketAddress.Namespace.RESERVED); 1066 1067 // Wait for the socket to connect. 1068 while (true) { 1069 try { 1070 mSockets[i].connect(address); 1071 break; 1072 } catch (Exception e) { 1073 // ignore 1074 } 1075 checkpoint(true); 1076 } 1077 mSockets[i].setSoTimeout(500); 1078 1079 // Send over the arguments. 1080 OutputStream out = mSockets[i].getOutputStream(); 1081 for (String argument : arguments) { 1082 byte[] bytes = argument.getBytes(StandardCharsets.UTF_8); 1083 if (bytes.length >= 0xFFFF) { 1084 throw new IllegalArgumentException("Argument is too large"); 1085 } 1086 out.write(bytes.length >> 8); 1087 out.write(bytes.length); 1088 out.write(bytes); 1089 checkpoint(false); 1090 } 1091 out.write(0xFF); 1092 out.write(0xFF); 1093 out.flush(); 1094 1095 // Wait for End-of-File. 1096 InputStream in = mSockets[i].getInputStream(); 1097 while (true) { 1098 try { 1099 if (in.read() == -1) { 1100 break; 1101 } 1102 } catch (Exception e) { 1103 // ignore 1104 } 1105 checkpoint(true); 1106 } 1107 } 1108 1109 // Wait for the daemons to create the new state. 1110 while (!state.exists()) { 1111 // Check if a running daemon is dead. 1112 for (int i = 0; i < mDaemons.length; ++i) { 1113 String daemon = mDaemons[i]; 1114 if (mArguments[i] != null && !SystemService.isRunning(daemon)) { 1115 throw new IllegalStateException(daemon + " is dead"); 1116 } 1117 } 1118 checkpoint(true); 1119 } 1120 1121 // Now we are connected. Read and parse the new state. 1122 String[] parameters = FileUtils.readTextFile(state, 0, null).split("\n", -1); 1123 if (parameters.length != 6) { 1124 throw new IllegalStateException("Cannot parse the state"); 1125 } 1126 1127 // Set the interface and the addresses in the config. 1128 mConfig.interfaze = parameters[0].trim(); 1129 1130 mConfig.addLegacyAddresses(parameters[1]); 1131 // Set the routes if they are not set in the config. 1132 if (mConfig.routes == null || mConfig.routes.isEmpty()) { 1133 mConfig.addLegacyRoutes(parameters[2]); 1134 } 1135 1136 // Set the DNS servers if they are not set in the config. 1137 if (mConfig.dnsServers == null || mConfig.dnsServers.size() == 0) { 1138 String dnsServers = parameters[3].trim(); 1139 if (!dnsServers.isEmpty()) { 1140 mConfig.dnsServers = Arrays.asList(dnsServers.split(" ")); 1141 } 1142 } 1143 1144 // Set the search domains if they are not set in the config. 1145 if (mConfig.searchDomains == null || mConfig.searchDomains.size() == 0) { 1146 String searchDomains = parameters[4].trim(); 1147 if (!searchDomains.isEmpty()) { 1148 mConfig.searchDomains = Arrays.asList(searchDomains.split(" ")); 1149 } 1150 } 1151 1152 // Here is the last step and it must be done synchronously. 1153 synchronized (Vpn.this) { 1154 // Set the start time 1155 mConfig.startTime = SystemClock.elapsedRealtime(); 1156 1157 // Check if the thread is interrupted while we are waiting. 1158 checkpoint(false); 1159 1160 // Check if the interface is gone while we are waiting. 1161 if (jniCheck(mConfig.interfaze) == 0) { 1162 throw new IllegalStateException(mConfig.interfaze + " is gone"); 1163 } 1164 1165 // Now INetworkManagementEventObserver is watching our back. 1166 mInterface = mConfig.interfaze; 1167 mVpnUsers = new ArrayList<UidRange>(); 1168 1169 agentConnect(); 1170 1171 Log.i(TAG, "Connected!"); 1172 } 1173 } catch (Exception e) { 1174 Log.i(TAG, "Aborting", e); 1175 exit(); 1176 } finally { 1177 // Kill the daemons if they fail to stop. 1178 if (!initFinished) { 1179 for (String daemon : mDaemons) { 1180 SystemService.stop(daemon); 1181 } 1182 } 1183 1184 // Do not leave an unstable state. 1185 if (!initFinished || mNetworkInfo.getDetailedState() == DetailedState.CONNECTING) { 1186 agentDisconnect(); 1187 } 1188 } 1189 } 1190 1191 /** 1192 * Monitor the daemons we started, moving to disconnected state if the 1193 * underlying services fail. 1194 */ 1195 private void monitorDaemons() { 1196 if (!mNetworkInfo.isConnected()) { 1197 return; 1198 } 1199 1200 try { 1201 while (true) { 1202 Thread.sleep(2000); 1203 for (int i = 0; i < mDaemons.length; i++) { 1204 if (mArguments[i] != null && SystemService.isStopped(mDaemons[i])) { 1205 return; 1206 } 1207 } 1208 } 1209 } catch (InterruptedException e) { 1210 Log.d(TAG, "interrupted during monitorDaemons(); stopping services"); 1211 } finally { 1212 for (String daemon : mDaemons) { 1213 SystemService.stop(daemon); 1214 } 1215 1216 agentDisconnect(); 1217 } 1218 } 1219 } 1220} 1221