| /* |
| * 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 static android.Manifest.permission.BIND_VPN_SERVICE; |
| import static android.os.UserHandle.PER_USER_RANGE; |
| import static android.net.RouteInfo.RTN_THROW; |
| import static android.net.RouteInfo.RTN_UNREACHABLE; |
| import static android.system.OsConstants.AF_INET; |
| import static android.system.OsConstants.AF_INET6; |
| |
| import android.Manifest; |
| import android.app.AppGlobals; |
| import android.app.AppOpsManager; |
| import android.app.PendingIntent; |
| import android.content.BroadcastReceiver; |
| import android.content.ComponentName; |
| import android.content.Context; |
| import android.content.Intent; |
| import android.content.IntentFilter; |
| import android.content.ServiceConnection; |
| import android.content.pm.ApplicationInfo; |
| import android.content.pm.PackageManager; |
| import android.content.pm.PackageManager.NameNotFoundException; |
| import android.content.pm.ResolveInfo; |
| import android.content.pm.UserInfo; |
| import android.net.ConnectivityManager; |
| import android.net.IConnectivityManager; |
| import android.net.INetworkManagementEventObserver; |
| import android.net.IpPrefix; |
| import android.net.LinkAddress; |
| import android.net.LinkProperties; |
| import android.net.LocalSocket; |
| import android.net.LocalSocketAddress; |
| import android.net.NetworkAgent; |
| import android.net.NetworkCapabilities; |
| import android.net.NetworkInfo; |
| import android.net.NetworkInfo.DetailedState; |
| import android.net.NetworkMisc; |
| import android.net.RouteInfo; |
| import android.net.UidRange; |
| import android.os.Binder; |
| import android.os.FileUtils; |
| import android.os.IBinder; |
| import android.os.INetworkManagementService; |
| import android.os.Looper; |
| import android.os.Parcel; |
| import android.os.ParcelFileDescriptor; |
| import android.os.Process; |
| import android.os.RemoteException; |
| import android.os.SystemClock; |
| import android.os.SystemService; |
| import android.os.UserHandle; |
| import android.os.UserManager; |
| import android.security.Credentials; |
| import android.security.KeyStore; |
| import android.util.Log; |
| |
| import com.android.internal.annotations.GuardedBy; |
| import com.android.internal.net.LegacyVpnInfo; |
| import com.android.internal.net.VpnConfig; |
| import com.android.internal.net.VpnProfile; |
| import com.android.server.net.BaseNetworkObserver; |
| |
| import libcore.io.IoUtils; |
| |
| import java.io.File; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.OutputStream; |
| import java.net.Inet4Address; |
| import java.net.Inet6Address; |
| import java.net.InetAddress; |
| import java.nio.charset.StandardCharsets; |
| import java.util.ArrayList; |
| import java.util.Arrays; |
| import java.util.List; |
| import java.util.SortedSet; |
| import java.util.TreeSet; |
| import java.util.concurrent.atomic.AtomicInteger; |
| |
| /** |
| * @hide |
| */ |
| public class Vpn { |
| private static final String NETWORKTYPE = "VPN"; |
| private static final String TAG = "Vpn"; |
| private static final boolean LOGD = true; |
| |
| // TODO: create separate trackers for each unique VPN to support |
| // automated reconnection |
| |
| private Context mContext; |
| private NetworkInfo mNetworkInfo; |
| private String mPackage; |
| private int mOwnerUID; |
| private String mInterface; |
| private Connection mConnection; |
| private LegacyVpnRunner mLegacyVpnRunner; |
| private PendingIntent mStatusIntent; |
| private volatile boolean mEnableTeardown = true; |
| private final IConnectivityManager mConnService; |
| private final INetworkManagementService mNetd; |
| private VpnConfig mConfig; |
| private NetworkAgent mNetworkAgent; |
| private final Looper mLooper; |
| private final NetworkCapabilities mNetworkCapabilities; |
| |
| /* list of users using this VPN. */ |
| @GuardedBy("this") |
| private List<UidRange> mVpnUsers = null; |
| private BroadcastReceiver mUserIntentReceiver = null; |
| |
| // Handle of user initiating VPN. |
| private final int mUserHandle; |
| |
| public Vpn(Looper looper, Context context, INetworkManagementService netService, |
| IConnectivityManager connService, int userHandle) { |
| mContext = context; |
| mNetd = netService; |
| mConnService = connService; |
| mUserHandle = userHandle; |
| mLooper = looper; |
| |
| mPackage = VpnConfig.LEGACY_VPN; |
| mOwnerUID = getAppUid(mPackage, mUserHandle); |
| |
| try { |
| netService.registerObserver(mObserver); |
| } catch (RemoteException e) { |
| Log.wtf(TAG, "Problem registering observer", e); |
| } |
| if (userHandle == UserHandle.USER_OWNER) { |
| // Owner's VPN also needs to handle restricted users |
| mUserIntentReceiver = new BroadcastReceiver() { |
| @Override |
| public void onReceive(Context context, Intent intent) { |
| final String action = intent.getAction(); |
| final int userHandle = intent.getIntExtra(Intent.EXTRA_USER_HANDLE, |
| UserHandle.USER_NULL); |
| if (userHandle == UserHandle.USER_NULL) return; |
| |
| if (Intent.ACTION_USER_ADDED.equals(action)) { |
| onUserAdded(userHandle); |
| } else if (Intent.ACTION_USER_REMOVED.equals(action)) { |
| onUserRemoved(userHandle); |
| } |
| } |
| }; |
| |
| IntentFilter intentFilter = new IntentFilter(); |
| intentFilter.addAction(Intent.ACTION_USER_ADDED); |
| intentFilter.addAction(Intent.ACTION_USER_REMOVED); |
| mContext.registerReceiverAsUser( |
| mUserIntentReceiver, UserHandle.ALL, intentFilter, null, null); |
| } |
| |
| mNetworkInfo = new NetworkInfo(ConnectivityManager.TYPE_VPN, 0, NETWORKTYPE, ""); |
| // TODO: Copy metered attribute and bandwidths from physical transport, b/16207332 |
| mNetworkCapabilities = new NetworkCapabilities(); |
| mNetworkCapabilities.addTransportType(NetworkCapabilities.TRANSPORT_VPN); |
| mNetworkCapabilities.removeCapability(NetworkCapabilities.NET_CAPABILITY_NOT_VPN); |
| } |
| |
| /** |
| * Set if this object is responsible for watching for {@link NetworkInfo} |
| * teardown. When {@code false}, teardown is handled externally by someone |
| * else. |
| */ |
| public void setEnableTeardown(boolean enableTeardown) { |
| mEnableTeardown = enableTeardown; |
| } |
| |
| /** |
| * Update current state, dispaching event to listeners. |
| */ |
| private void updateState(DetailedState detailedState, String reason) { |
| if (LOGD) Log.d(TAG, "setting state=" + detailedState + ", reason=" + reason); |
| mNetworkInfo.setDetailedState(detailedState, reason, null); |
| if (mNetworkAgent != null) { |
| mNetworkAgent.sendNetworkInfo(mNetworkInfo); |
| } |
| } |
| |
| /** |
| * 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) { |
| if (oldPackage != null && getAppUid(oldPackage, mUserHandle) != mOwnerUID) { |
| // The package doesn't match. We return false (to obtain user consent) unless the user |
| // has already consented to that VPN package. |
| if (!oldPackage.equals(VpnConfig.LEGACY_VPN) && isVpnUserPreConsented(oldPackage)) { |
| prepareInternal(oldPackage); |
| return true; |
| } |
| return false; |
| } |
| |
| // Return true if we do not need to revoke. |
| if (newPackage == null || (!newPackage.equals(VpnConfig.LEGACY_VPN) && |
| getAppUid(newPackage, mUserHandle) == mOwnerUID)) { |
| return true; |
| } |
| |
| // Check if the caller is authorized. |
| enforceControlPermission(); |
| |
| prepareInternal(newPackage); |
| return true; |
| } |
| |
| /** Prepare the VPN for the given package. Does not perform permission checks. */ |
| private void prepareInternal(String newPackage) { |
| long token = Binder.clearCallingIdentity(); |
| try { |
| // Reset the interface. |
| if (mInterface != null) { |
| mStatusIntent = null; |
| agentDisconnect(); |
| jniReset(mInterface); |
| mInterface = null; |
| mVpnUsers = null; |
| } |
| |
| // Revoke the connection or stop LegacyVpnRunner. |
| if (mConnection != null) { |
| try { |
| mConnection.mService.transact(IBinder.LAST_CALL_TRANSACTION, |
| Parcel.obtain(), null, IBinder.FLAG_ONEWAY); |
| } catch (Exception e) { |
| // ignore |
| } |
| mContext.unbindService(mConnection); |
| mConnection = null; |
| } else if (mLegacyVpnRunner != null) { |
| mLegacyVpnRunner.exit(); |
| mLegacyVpnRunner = null; |
| } |
| |
| try { |
| mNetd.denyProtect(mOwnerUID); |
| } catch (Exception e) { |
| Log.wtf(TAG, "Failed to disallow UID " + mOwnerUID + " to call protect() " + e); |
| } |
| |
| Log.i(TAG, "Switched from " + mPackage + " to " + newPackage); |
| mPackage = newPackage; |
| mOwnerUID = getAppUid(newPackage, mUserHandle); |
| try { |
| mNetd.allowProtect(mOwnerUID); |
| } catch (Exception e) { |
| Log.wtf(TAG, "Failed to allow UID " + mOwnerUID + " to call protect() " + e); |
| } |
| mConfig = null; |
| |
| updateState(DetailedState.IDLE, "prepare"); |
| } finally { |
| Binder.restoreCallingIdentity(token); |
| } |
| } |
| |
| /** |
| * Set whether the current package has the ability to launch VPNs without user intervention. |
| */ |
| public void setPackageAuthorization(boolean authorized) { |
| // Check if the caller is authorized. |
| enforceControlPermission(); |
| |
| if (mPackage == null || VpnConfig.LEGACY_VPN.equals(mPackage)) { |
| return; |
| } |
| |
| long token = Binder.clearCallingIdentity(); |
| try { |
| AppOpsManager appOps = |
| (AppOpsManager) mContext.getSystemService(Context.APP_OPS_SERVICE); |
| appOps.setMode(AppOpsManager.OP_ACTIVATE_VPN, mOwnerUID, mPackage, |
| authorized ? AppOpsManager.MODE_ALLOWED : AppOpsManager.MODE_IGNORED); |
| } catch (Exception e) { |
| Log.wtf(TAG, "Failed to set app ops for package " + mPackage, e); |
| } finally { |
| Binder.restoreCallingIdentity(token); |
| } |
| } |
| |
| private boolean isVpnUserPreConsented(String packageName) { |
| AppOpsManager appOps = |
| (AppOpsManager) mContext.getSystemService(Context.APP_OPS_SERVICE); |
| |
| // Verify that the caller matches the given package and has permission to activate VPNs. |
| return appOps.noteOpNoThrow(AppOpsManager.OP_ACTIVATE_VPN, Binder.getCallingUid(), |
| packageName) == AppOpsManager.MODE_ALLOWED; |
| } |
| |
| private int getAppUid(String app, int userHandle) { |
| if (VpnConfig.LEGACY_VPN.equals(app)) { |
| return Process.myUid(); |
| } |
| PackageManager pm = mContext.getPackageManager(); |
| int result; |
| try { |
| result = pm.getPackageUid(app, userHandle); |
| } catch (NameNotFoundException e) { |
| result = -1; |
| } |
| return result; |
| } |
| |
| public NetworkInfo getNetworkInfo() { |
| return mNetworkInfo; |
| } |
| |
| private LinkProperties makeLinkProperties() { |
| boolean allowIPv4 = mConfig.allowIPv4; |
| boolean allowIPv6 = mConfig.allowIPv6; |
| |
| LinkProperties lp = new LinkProperties(); |
| |
| lp.setInterfaceName(mInterface); |
| |
| if (mConfig.addresses != null) { |
| for (LinkAddress address : mConfig.addresses) { |
| lp.addLinkAddress(address); |
| allowIPv4 |= address.getAddress() instanceof Inet4Address; |
| allowIPv6 |= address.getAddress() instanceof Inet6Address; |
| } |
| } |
| |
| if (mConfig.routes != null) { |
| for (RouteInfo route : mConfig.routes) { |
| lp.addRoute(route); |
| InetAddress address = route.getDestination().getAddress(); |
| allowIPv4 |= address instanceof Inet4Address; |
| allowIPv6 |= address instanceof Inet6Address; |
| } |
| } |
| |
| if (mConfig.dnsServers != null) { |
| for (String dnsServer : mConfig.dnsServers) { |
| InetAddress address = InetAddress.parseNumericAddress(dnsServer); |
| lp.addDnsServer(address); |
| allowIPv4 |= address instanceof Inet4Address; |
| allowIPv6 |= address instanceof Inet6Address; |
| } |
| } |
| |
| if (!allowIPv4) { |
| lp.addRoute(new RouteInfo(new IpPrefix(Inet4Address.ANY, 0), RTN_UNREACHABLE)); |
| } |
| if (!allowIPv6) { |
| lp.addRoute(new RouteInfo(new IpPrefix(Inet6Address.ANY, 0), RTN_UNREACHABLE)); |
| } |
| |
| // Concatenate search domains into a string. |
| StringBuilder buffer = new StringBuilder(); |
| if (mConfig.searchDomains != null) { |
| for (String domain : mConfig.searchDomains) { |
| buffer.append(domain).append(' '); |
| } |
| } |
| lp.setDomains(buffer.toString().trim()); |
| |
| // TODO: Stop setting the MTU in jniCreate and set it here. |
| |
| return lp; |
| } |
| |
| private void agentConnect() { |
| LinkProperties lp = makeLinkProperties(); |
| |
| if (lp.hasIPv4DefaultRoute() || lp.hasIPv6DefaultRoute()) { |
| mNetworkCapabilities.addCapability(NetworkCapabilities.NET_CAPABILITY_INTERNET); |
| } else { |
| mNetworkCapabilities.removeCapability(NetworkCapabilities.NET_CAPABILITY_INTERNET); |
| } |
| |
| mNetworkInfo.setIsAvailable(true); |
| mNetworkInfo.setDetailedState(DetailedState.CONNECTED, null, null); |
| |
| NetworkMisc networkMisc = new NetworkMisc(); |
| networkMisc.allowBypass = mConfig.allowBypass; |
| |
| long token = Binder.clearCallingIdentity(); |
| try { |
| mNetworkAgent = new NetworkAgent(mLooper, mContext, NETWORKTYPE, |
| mNetworkInfo, mNetworkCapabilities, lp, 0, networkMisc) { |
| @Override |
| public void unwanted() { |
| // We are user controlled, not driven by NetworkRequest. |
| } |
| }; |
| } finally { |
| Binder.restoreCallingIdentity(token); |
| } |
| |
| addVpnUserLocked(mUserHandle); |
| // If we are owner assign all Restricted Users to this VPN |
| if (mUserHandle == UserHandle.USER_OWNER) { |
| token = Binder.clearCallingIdentity(); |
| List<UserInfo> users; |
| try { |
| users = UserManager.get(mContext).getUsers(); |
| } finally { |
| Binder.restoreCallingIdentity(token); |
| } |
| for (UserInfo user : users) { |
| if (user.isRestricted()) { |
| addVpnUserLocked(user.id); |
| } |
| } |
| } |
| mNetworkAgent.addUidRanges(mVpnUsers.toArray(new UidRange[mVpnUsers.size()])); |
| } |
| |
| private void agentDisconnect(NetworkInfo networkInfo, NetworkAgent networkAgent) { |
| networkInfo.setIsAvailable(false); |
| networkInfo.setDetailedState(DetailedState.DISCONNECTED, null, null); |
| if (networkAgent != null) { |
| networkAgent.sendNetworkInfo(networkInfo); |
| } |
| } |
| |
| private void agentDisconnect(NetworkAgent networkAgent) { |
| NetworkInfo networkInfo = new NetworkInfo(mNetworkInfo); |
| agentDisconnect(networkInfo, networkAgent); |
| } |
| |
| private void agentDisconnect() { |
| if (mNetworkInfo.isConnected()) { |
| agentDisconnect(mNetworkInfo, mNetworkAgent); |
| mNetworkAgent = null; |
| } |
| } |
| |
| /** |
| * 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 if the caller is already prepared. |
| UserManager mgr = UserManager.get(mContext); |
| if (Binder.getCallingUid() != mOwnerUID) { |
| return null; |
| } |
| // Check if the service is properly declared. |
| Intent intent = new Intent(VpnConfig.SERVICE_INTERFACE); |
| intent.setClassName(mPackage, config.user); |
| long token = Binder.clearCallingIdentity(); |
| try { |
| // Restricted users are not allowed to create VPNs, they are tied to Owner |
| UserInfo user = mgr.getUserInfo(mUserHandle); |
| if (user.isRestricted() || mgr.hasUserRestriction(UserManager.DISALLOW_CONFIG_VPN)) { |
| throw new SecurityException("Restricted users cannot establish VPNs"); |
| } |
| |
| ResolveInfo info = AppGlobals.getPackageManager().resolveService(intent, |
| null, 0, mUserHandle); |
| if (info == null) { |
| throw new SecurityException("Cannot find " + config.user); |
| } |
| if (!BIND_VPN_SERVICE.equals(info.serviceInfo.permission)) { |
| throw new SecurityException(config.user + " does not require " + BIND_VPN_SERVICE); |
| } |
| } catch (RemoteException e) { |
| throw new SecurityException("Cannot find " + config.user); |
| } finally { |
| Binder.restoreCallingIdentity(token); |
| } |
| |
| // Save the old config in case we need to go back. |
| VpnConfig oldConfig = mConfig; |
| String oldInterface = mInterface; |
| Connection oldConnection = mConnection; |
| NetworkAgent oldNetworkAgent = mNetworkAgent; |
| mNetworkAgent = null; |
| List<UidRange> oldUsers = mVpnUsers; |
| |
| // Configure the interface. Abort if any of these steps fails. |
| ParcelFileDescriptor tun = ParcelFileDescriptor.adoptFd(jniCreate(config.mtu)); |
| try { |
| updateState(DetailedState.CONNECTING, "establish"); |
| String interfaze = jniGetName(tun.getFd()); |
| |
| // TEMP use the old jni calls until there is support for netd address setting |
| StringBuilder builder = new StringBuilder(); |
| for (LinkAddress address : config.addresses) { |
| builder.append(" " + address); |
| } |
| if (jniSetAddresses(interfaze, builder.toString()) < 1) { |
| throw new IllegalArgumentException("At least one address must be specified"); |
| } |
| Connection connection = new Connection(); |
| if (!mContext.bindServiceAsUser(intent, connection, Context.BIND_AUTO_CREATE, |
| new UserHandle(mUserHandle))) { |
| throw new IllegalStateException("Cannot bind " + config.user); |
| } |
| |
| mConnection = connection; |
| mInterface = interfaze; |
| |
| // Fill more values. |
| config.user = mPackage; |
| config.interfaze = mInterface; |
| config.startTime = SystemClock.elapsedRealtime(); |
| mConfig = config; |
| |
| // Set up forwarding and DNS rules. |
| mVpnUsers = new ArrayList<UidRange>(); |
| |
| agentConnect(); |
| |
| if (oldConnection != null) { |
| mContext.unbindService(oldConnection); |
| } |
| // Remove the old tun's user forwarding rules |
| // The new tun's user rules have already been added so they will take over |
| // as rules are deleted. This prevents data leakage as the rules are moved over. |
| agentDisconnect(oldNetworkAgent); |
| if (oldInterface != null && !oldInterface.equals(interfaze)) { |
| jniReset(oldInterface); |
| } |
| |
| try { |
| IoUtils.setBlocking(tun.getFileDescriptor(), config.blocking); |
| } catch (IOException e) { |
| throw new IllegalStateException( |
| "Cannot set tunnel's fd as blocking=" + config.blocking, e); |
| } |
| } catch (RuntimeException e) { |
| IoUtils.closeQuietly(tun); |
| agentDisconnect(); |
| // restore old state |
| mConfig = oldConfig; |
| mConnection = oldConnection; |
| mVpnUsers = oldUsers; |
| mNetworkAgent = oldNetworkAgent; |
| mInterface = oldInterface; |
| throw e; |
| } |
| Log.i(TAG, "Established by " + config.user + " on " + mInterface); |
| return tun; |
| } |
| |
| private boolean isRunningLocked() { |
| return mVpnUsers != null; |
| } |
| |
| // Note: Return type guarantees results are deduped and sorted, which callers require. |
| private SortedSet<Integer> getAppsUids(List<String> packageNames, int userHandle) { |
| SortedSet<Integer> uids = new TreeSet<Integer>(); |
| for (String app : packageNames) { |
| int uid = getAppUid(app, userHandle); |
| if (uid != -1) uids.add(uid); |
| } |
| return uids; |
| } |
| |
| // Note: This function adds to mVpnUsers but does not publish list to NetworkAgent. |
| private void addVpnUserLocked(int userHandle) { |
| if (!isRunningLocked()) { |
| throw new IllegalStateException("VPN is not active"); |
| } |
| |
| if (mConfig.allowedApplications != null) { |
| // Add ranges covering all UIDs for allowedApplications. |
| int start = -1, stop = -1; |
| for (int uid : getAppsUids(mConfig.allowedApplications, userHandle)) { |
| if (start == -1) { |
| start = uid; |
| } else if (uid != stop + 1) { |
| mVpnUsers.add(new UidRange(start, stop)); |
| start = uid; |
| } |
| stop = uid; |
| } |
| if (start != -1) mVpnUsers.add(new UidRange(start, stop)); |
| } else if (mConfig.disallowedApplications != null) { |
| // Add all ranges for user skipping UIDs for disallowedApplications. |
| final UidRange userRange = UidRange.createForUser(userHandle); |
| int start = userRange.start; |
| for (int uid : getAppsUids(mConfig.disallowedApplications, userHandle)) { |
| if (uid == start) { |
| start++; |
| } else { |
| mVpnUsers.add(new UidRange(start, uid - 1)); |
| start = uid + 1; |
| } |
| } |
| if (start <= userRange.stop) mVpnUsers.add(new UidRange(start, userRange.stop)); |
| } else { |
| // Add all UIDs for the user. |
| mVpnUsers.add(UidRange.createForUser(userHandle)); |
| } |
| |
| prepareStatusIntent(); |
| } |
| |
| // Returns the subset of the full list of active UID ranges the VPN applies to (mVpnUsers) that |
| // apply to userHandle. |
| private List<UidRange> uidRangesForUser(int userHandle) { |
| final UidRange userRange = UidRange.createForUser(userHandle); |
| final List<UidRange> ranges = new ArrayList<UidRange>(); |
| for (UidRange range : mVpnUsers) { |
| if (range.start >= userRange.start && range.stop <= userRange.stop) { |
| ranges.add(range); |
| } |
| } |
| return ranges; |
| } |
| |
| private void removeVpnUserLocked(int userHandle) { |
| if (!isRunningLocked()) { |
| throw new IllegalStateException("VPN is not active"); |
| } |
| final List<UidRange> ranges = uidRangesForUser(userHandle); |
| if (mNetworkAgent != null) { |
| mNetworkAgent.removeUidRanges(ranges.toArray(new UidRange[ranges.size()])); |
| } |
| mVpnUsers.removeAll(ranges); |
| mStatusIntent = null; |
| } |
| |
| private void onUserAdded(int userHandle) { |
| // If the user is restricted tie them to the owner's VPN |
| synchronized(Vpn.this) { |
| UserManager mgr = UserManager.get(mContext); |
| UserInfo user = mgr.getUserInfo(userHandle); |
| if (user.isRestricted()) { |
| try { |
| addVpnUserLocked(userHandle); |
| if (mNetworkAgent != null) { |
| final List<UidRange> ranges = uidRangesForUser(userHandle); |
| mNetworkAgent.addUidRanges(ranges.toArray(new UidRange[ranges.size()])); |
| } |
| } catch (Exception e) { |
| Log.wtf(TAG, "Failed to add restricted user to owner", e); |
| } |
| } |
| } |
| } |
| |
| private void onUserRemoved(int userHandle) { |
| // clean up if restricted |
| synchronized(Vpn.this) { |
| UserManager mgr = UserManager.get(mContext); |
| UserInfo user = mgr.getUserInfo(userHandle); |
| if (user.isRestricted()) { |
| try { |
| removeVpnUserLocked(userHandle); |
| } catch (Exception e) { |
| Log.wtf(TAG, "Failed to remove restricted user to owner", e); |
| } |
| } |
| } |
| } |
| |
| /** |
| * Return the configuration of the currently running VPN. |
| */ |
| public VpnConfig getVpnConfig() { |
| enforceControlPermission(); |
| return mConfig; |
| } |
| |
| @Deprecated |
| public synchronized void interfaceStatusChanged(String iface, boolean up) { |
| try { |
| mObserver.interfaceStatusChanged(iface, up); |
| } catch (RemoteException e) { |
| // ignored; target is local |
| } |
| } |
| |
| private INetworkManagementEventObserver mObserver = new BaseNetworkObserver() { |
| @Override |
| public void interfaceStatusChanged(String interfaze, boolean up) { |
| synchronized (Vpn.this) { |
| if (!up && mLegacyVpnRunner != null) { |
| mLegacyVpnRunner.check(interfaze); |
| } |
| } |
| } |
| |
| @Override |
| public void interfaceRemoved(String interfaze) { |
| synchronized (Vpn.this) { |
| if (interfaze.equals(mInterface) && jniCheck(interfaze) == 0) { |
| mStatusIntent = null; |
| mVpnUsers = null; |
| mInterface = null; |
| if (mConnection != null) { |
| mContext.unbindService(mConnection); |
| mConnection = null; |
| agentDisconnect(); |
| } else if (mLegacyVpnRunner != null) { |
| mLegacyVpnRunner.exit(); |
| mLegacyVpnRunner = null; |
| } |
| } |
| } |
| } |
| }; |
| |
| private void enforceControlPermission() { |
| mContext.enforceCallingPermission(Manifest.permission.CONTROL_VPN, "Unauthorized Caller"); |
| } |
| |
| private class Connection implements ServiceConnection { |
| private IBinder mService; |
| |
| @Override |
| public void onServiceConnected(ComponentName name, IBinder service) { |
| mService = service; |
| } |
| |
| @Override |
| public void onServiceDisconnected(ComponentName name) { |
| mService = null; |
| } |
| } |
| |
| private void prepareStatusIntent() { |
| final long token = Binder.clearCallingIdentity(); |
| try { |
| mStatusIntent = VpnConfig.getIntentForStatusPanel(mContext); |
| } finally { |
| Binder.restoreCallingIdentity(token); |
| } |
| } |
| |
| public synchronized boolean addAddress(String address, int prefixLength) { |
| if (Binder.getCallingUid() != mOwnerUID || mInterface == null || mNetworkAgent == null) { |
| return false; |
| } |
| boolean success = jniAddAddress(mInterface, address, prefixLength); |
| if (mNetworkAgent != null) { |
| mNetworkAgent.sendLinkProperties(makeLinkProperties()); |
| } |
| return success; |
| } |
| |
| public synchronized boolean removeAddress(String address, int prefixLength) { |
| if (Binder.getCallingUid() != mOwnerUID || mInterface == null || mNetworkAgent == null) { |
| return false; |
| } |
| boolean success = jniDelAddress(mInterface, address, prefixLength); |
| if (mNetworkAgent != null) { |
| mNetworkAgent.sendLinkProperties(makeLinkProperties()); |
| } |
| return success; |
| } |
| |
| private native int jniCreate(int mtu); |
| private native String jniGetName(int tun); |
| private native int jniSetAddresses(String interfaze, String addresses); |
| private native void jniReset(String interfaze); |
| private native int jniCheck(String interfaze); |
| private native boolean jniAddAddress(String interfaze, String address, int prefixLen); |
| private native boolean jniDelAddress(String interfaze, String address, int prefixLen); |
| |
| private static RouteInfo findIPv4DefaultRoute(LinkProperties prop) { |
| for (RouteInfo route : prop.getAllRoutes()) { |
| // Currently legacy VPN only works on IPv4. |
| if (route.isDefaultRoute() && route.getGateway() instanceof Inet4Address) { |
| return route; |
| } |
| } |
| |
| throw new IllegalStateException("Unable to find IPv4 default gateway"); |
| } |
| |
| /** |
| * Start legacy VPN, controlling native daemons as needed. Creates a |
| * secondary thread to perform connection work, returning quickly. |
| */ |
| public void startLegacyVpn(VpnProfile profile, KeyStore keyStore, LinkProperties egress) { |
| enforceControlPermission(); |
| if (!keyStore.isUnlocked()) { |
| throw new IllegalStateException("KeyStore isn't unlocked"); |
| } |
| UserManager mgr = UserManager.get(mContext); |
| UserInfo user = mgr.getUserInfo(mUserHandle); |
| if (user.isRestricted() || mgr.hasUserRestriction(UserManager.DISALLOW_CONFIG_VPN)) { |
| throw new SecurityException("Restricted users cannot establish VPNs"); |
| } |
| |
| final RouteInfo ipv4DefaultRoute = findIPv4DefaultRoute(egress); |
| final String gateway = ipv4DefaultRoute.getGateway().getHostAddress(); |
| final String iface = ipv4DefaultRoute.getInterface(); |
| |
| // Load certificates. |
| String privateKey = ""; |
| String userCert = ""; |
| String caCert = ""; |
| String serverCert = ""; |
| if (!profile.ipsecUserCert.isEmpty()) { |
| privateKey = Credentials.USER_PRIVATE_KEY + profile.ipsecUserCert; |
| byte[] value = keyStore.get(Credentials.USER_CERTIFICATE + profile.ipsecUserCert); |
| userCert = (value == null) ? null : new String(value, StandardCharsets.UTF_8); |
| } |
| if (!profile.ipsecCaCert.isEmpty()) { |
| byte[] value = keyStore.get(Credentials.CA_CERTIFICATE + profile.ipsecCaCert); |
| caCert = (value == null) ? null : new String(value, StandardCharsets.UTF_8); |
| } |
| if (!profile.ipsecServerCert.isEmpty()) { |
| byte[] value = keyStore.get(Credentials.USER_CERTIFICATE + profile.ipsecServerCert); |
| serverCert = (value == null) ? null : new String(value, StandardCharsets.UTF_8); |
| } |
| if (privateKey == null || userCert == null || caCert == null || serverCert == null) { |
| throw new IllegalStateException("Cannot load credentials"); |
| } |
| |
| // Prepare arguments for racoon. |
| String[] racoon = null; |
| switch (profile.type) { |
| case VpnProfile.TYPE_L2TP_IPSEC_PSK: |
| racoon = new String[] { |
| iface, profile.server, "udppsk", profile.ipsecIdentifier, |
| profile.ipsecSecret, "1701", |
| }; |
| break; |
| case VpnProfile.TYPE_L2TP_IPSEC_RSA: |
| racoon = new String[] { |
| iface, profile.server, "udprsa", privateKey, userCert, |
| caCert, serverCert, "1701", |
| }; |
| break; |
| case VpnProfile.TYPE_IPSEC_XAUTH_PSK: |
| racoon = new String[] { |
| iface, profile.server, "xauthpsk", profile.ipsecIdentifier, |
| profile.ipsecSecret, profile.username, profile.password, "", gateway, |
| }; |
| break; |
| case VpnProfile.TYPE_IPSEC_XAUTH_RSA: |
| racoon = new String[] { |
| iface, profile.server, "xauthrsa", privateKey, userCert, |
| caCert, serverCert, profile.username, profile.password, "", gateway, |
| }; |
| break; |
| case VpnProfile.TYPE_IPSEC_HYBRID_RSA: |
| racoon = new String[] { |
| iface, profile.server, "hybridrsa", |
| caCert, serverCert, profile.username, profile.password, "", gateway, |
| }; |
| break; |
| } |
| |
| // Prepare arguments for mtpd. |
| String[] mtpd = null; |
| switch (profile.type) { |
| case VpnProfile.TYPE_PPTP: |
| mtpd = new String[] { |
| iface, "pptp", profile.server, "1723", |
| "name", profile.username, "password", profile.password, |
| "linkname", "vpn", "refuse-eap", "nodefaultroute", |
| "usepeerdns", "idle", "1800", "mtu", "1400", "mru", "1400", |
| (profile.mppe ? "+mppe" : "nomppe"), |
| }; |
| break; |
| case VpnProfile.TYPE_L2TP_IPSEC_PSK: |
| case VpnProfile.TYPE_L2TP_IPSEC_RSA: |
| mtpd = new String[] { |
| iface, "l2tp", profile.server, "1701", profile.l2tpSecret, |
| "name", profile.username, "password", profile.password, |
| "linkname", "vpn", "refuse-eap", "nodefaultroute", |
| "usepeerdns", "idle", "1800", "mtu", "1400", "mru", "1400", |
| }; |
| break; |
| } |
| |
| VpnConfig config = new VpnConfig(); |
| config.legacy = true; |
| config.user = profile.key; |
| config.interfaze = iface; |
| config.session = profile.name; |
| |
| config.addLegacyRoutes(profile.routes); |
| if (!profile.dnsServers.isEmpty()) { |
| config.dnsServers = Arrays.asList(profile.dnsServers.split(" +")); |
| } |
| if (!profile.searchDomains.isEmpty()) { |
| config.searchDomains = Arrays.asList(profile.searchDomains.split(" +")); |
| } |
| startLegacyVpn(config, racoon, mtpd); |
| } |
| |
| private synchronized void startLegacyVpn(VpnConfig config, String[] racoon, String[] mtpd) { |
| stopLegacyVpn(); |
| |
| // Prepare for the new request. This also checks the caller. |
| prepare(null, VpnConfig.LEGACY_VPN); |
| updateState(DetailedState.CONNECTING, "startLegacyVpn"); |
| |
| // Start a new LegacyVpnRunner and we are done! |
| mLegacyVpnRunner = new LegacyVpnRunner(config, racoon, mtpd); |
| mLegacyVpnRunner.start(); |
| } |
| |
| public synchronized void stopLegacyVpn() { |
| if (mLegacyVpnRunner != null) { |
| mLegacyVpnRunner.exit(); |
| mLegacyVpnRunner = null; |
| |
| synchronized (LegacyVpnRunner.TAG) { |
| // wait for old thread to completely finish before spinning up |
| // new instance, otherwise state updates can be out of order. |
| } |
| } |
| } |
| |
| /** |
| * Return the information of the current ongoing legacy VPN. |
| */ |
| public synchronized LegacyVpnInfo getLegacyVpnInfo() { |
| // Check if the caller is authorized. |
| enforceControlPermission(); |
| if (mLegacyVpnRunner == null) return null; |
| |
| final LegacyVpnInfo info = new LegacyVpnInfo(); |
| info.key = mConfig.user; |
| info.state = LegacyVpnInfo.stateFromNetworkInfo(mNetworkInfo); |
| if (mNetworkInfo.isConnected()) { |
| info.intent = mStatusIntent; |
| } |
| return info; |
| } |
| |
| public VpnConfig getLegacyVpnConfig() { |
| if (mLegacyVpnRunner != null) { |
| return mConfig; |
| } else { |
| return null; |
| } |
| } |
| |
| /** |
| * 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 final String[] mDaemons; |
| private final String[][] mArguments; |
| private final LocalSocket[] mSockets; |
| private final String mOuterInterface; |
| private final AtomicInteger mOuterConnection = |
| new AtomicInteger(ConnectivityManager.TYPE_NONE); |
| |
| private long mTimer = -1; |
| |
| /** |
| * Watch for the outer connection (passing in the constructor) going away. |
| */ |
| private final BroadcastReceiver mBroadcastReceiver = new BroadcastReceiver() { |
| @Override |
| public void onReceive(Context context, Intent intent) { |
| if (!mEnableTeardown) return; |
| |
| if (intent.getAction().equals(ConnectivityManager.CONNECTIVITY_ACTION)) { |
| if (intent.getIntExtra(ConnectivityManager.EXTRA_NETWORK_TYPE, |
| ConnectivityManager.TYPE_NONE) == mOuterConnection.get()) { |
| NetworkInfo info = (NetworkInfo)intent.getExtra( |
| ConnectivityManager.EXTRA_NETWORK_INFO); |
| if (info != null && !info.isConnectedOrConnecting()) { |
| try { |
| mObserver.interfaceStatusChanged(mOuterInterface, false); |
| } catch (RemoteException e) {} |
| } |
| } |
| } |
| } |
| }; |
| |
| public LegacyVpnRunner(VpnConfig config, String[] racoon, String[] mtpd) { |
| super(TAG); |
| mConfig = config; |
| mDaemons = new String[] {"racoon", "mtpd"}; |
| // TODO: clear arguments from memory once launched |
| mArguments = new String[][] {racoon, mtpd}; |
| mSockets = new LocalSocket[mDaemons.length]; |
| |
| // This is the interface which VPN is running on, |
| // mConfig.interfaze will change to point to OUR |
| // internal interface soon. TODO - add inner/outer to mconfig |
| // TODO - we have a race - if the outer iface goes away/disconnects before we hit this |
| // we will leave the VPN up. We should check that it's still there/connected after |
| // registering |
| mOuterInterface = mConfig.interfaze; |
| |
| try { |
| mOuterConnection.set( |
| mConnService.findConnectionTypeForIface(mOuterInterface)); |
| } catch (Exception e) { |
| mOuterConnection.set(ConnectivityManager.TYPE_NONE); |
| } |
| |
| IntentFilter filter = new IntentFilter(); |
| filter.addAction(ConnectivityManager.CONNECTIVITY_ACTION); |
| mContext.registerReceiver(mBroadcastReceiver, filter); |
| } |
| |
| public void check(String interfaze) { |
| if (interfaze.equals(mOuterInterface)) { |
| Log.i(TAG, "Legacy VPN is going down with " + interfaze); |
| exit(); |
| } |
| } |
| |
| public void exit() { |
| // We assume that everything is reset after stopping the daemons. |
| interrupt(); |
| for (LocalSocket socket : mSockets) { |
| IoUtils.closeQuietly(socket); |
| } |
| agentDisconnect(); |
| try { |
| mContext.unregisterReceiver(mBroadcastReceiver); |
| } catch (IllegalArgumentException e) {} |
| } |
| |
| @Override |
| public void run() { |
| // Wait for the previous thread since it has been interrupted. |
| Log.v(TAG, "Waiting"); |
| synchronized (TAG) { |
| Log.v(TAG, "Executing"); |
| execute(); |
| monitorDaemons(); |
| } |
| } |
| |
| private void checkpoint(boolean yield) throws InterruptedException { |
| long now = SystemClock.elapsedRealtime(); |
| if (mTimer == -1) { |
| mTimer = now; |
| Thread.sleep(1); |
| } else if (now - mTimer <= 60000) { |
| Thread.sleep(yield ? 200 : 1); |
| } else { |
| updateState(DetailedState.FAILED, "checkpoint"); |
| throw new IllegalStateException("Time is up"); |
| } |
| } |
| |
| private void execute() { |
| // Catch all exceptions so we can clean up few things. |
| boolean initFinished = false; |
| try { |
| // Initialize the timer. |
| checkpoint(false); |
| |
| // Wait for the daemons to stop. |
| for (String daemon : mDaemons) { |
| while (!SystemService.isStopped(daemon)) { |
| checkpoint(true); |
| } |
| } |
| |
| // Clear the previous state. |
| File state = new File("/data/misc/vpn/state"); |
| state.delete(); |
| if (state.exists()) { |
| throw new IllegalStateException("Cannot delete the state"); |
| } |
| new File("/data/misc/vpn/abort").delete(); |
| initFinished = true; |
| |
| // Check if we need to restart any of the daemons. |
| boolean restart = false; |
| for (String[] arguments : mArguments) { |
| restart = restart || (arguments != null); |
| } |
| if (!restart) { |
| agentDisconnect(); |
| return; |
| } |
| updateState(DetailedState.CONNECTING, "execute"); |
| |
| // 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]; |
| SystemService.start(daemon); |
| |
| // Wait for the daemon to start. |
| while (!SystemService.isRunning(daemon)) { |
| checkpoint(true); |
| } |
| |
| // Create the control socket. |
| mSockets[i] = new LocalSocket(); |
| LocalSocketAddress address = new LocalSocketAddress( |
| daemon, LocalSocketAddress.Namespace.RESERVED); |
| |
| // Wait for the socket to connect. |
| while (true) { |
| try { |
| mSockets[i].connect(address); |
| break; |
| } catch (Exception e) { |
| // ignore |
| } |
| checkpoint(true); |
| } |
| mSockets[i].setSoTimeout(500); |
| |
| // Send over the arguments. |
| OutputStream out = mSockets[i].getOutputStream(); |
| for (String argument : arguments) { |
| byte[] bytes = argument.getBytes(StandardCharsets.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); |
| } |
| out.write(0xFF); |
| out.write(0xFF); |
| out.flush(); |
| |
| // Wait for End-of-File. |
| InputStream in = mSockets[i].getInputStream(); |
| while (true) { |
| try { |
| if (in.read() == -1) { |
| break; |
| } |
| } catch (Exception e) { |
| // ignore |
| } |
| checkpoint(true); |
| } |
| } |
| |
| // Wait for the daemons to create the new state. |
| while (!state.exists()) { |
| // Check if a running daemon is dead. |
| for (int i = 0; i < mDaemons.length; ++i) { |
| String daemon = mDaemons[i]; |
| if (mArguments[i] != null && !SystemService.isRunning(daemon)) { |
| throw new IllegalStateException(daemon + " is dead"); |
| } |
| } |
| checkpoint(true); |
| } |
| |
| // Now we are connected. Read and parse the new state. |
| String[] parameters = FileUtils.readTextFile(state, 0, null).split("\n", -1); |
| if (parameters.length != 7) { |
| throw new IllegalStateException("Cannot parse the state"); |
| } |
| |
| // Set the interface and the addresses in the config. |
| mConfig.interfaze = parameters[0].trim(); |
| |
| mConfig.addLegacyAddresses(parameters[1]); |
| // Set the routes if they are not set in the config. |
| if (mConfig.routes == null || mConfig.routes.isEmpty()) { |
| mConfig.addLegacyRoutes(parameters[2]); |
| } |
| |
| // Set the DNS servers if they are not set in the config. |
| if (mConfig.dnsServers == null || mConfig.dnsServers.size() == 0) { |
| String dnsServers = parameters[3].trim(); |
| if (!dnsServers.isEmpty()) { |
| mConfig.dnsServers = Arrays.asList(dnsServers.split(" ")); |
| } |
| } |
| |
| // Set the search domains if they are not set in the config. |
| if (mConfig.searchDomains == null || mConfig.searchDomains.size() == 0) { |
| String searchDomains = parameters[4].trim(); |
| if (!searchDomains.isEmpty()) { |
| mConfig.searchDomains = Arrays.asList(searchDomains.split(" ")); |
| } |
| } |
| |
| // Add a throw route for the VPN server endpoint, if one was specified. |
| String endpoint = parameters[5]; |
| if (!endpoint.isEmpty()) { |
| try { |
| InetAddress addr = InetAddress.parseNumericAddress(endpoint); |
| if (addr instanceof Inet4Address) { |
| mConfig.routes.add(new RouteInfo(new IpPrefix(addr, 32), RTN_THROW)); |
| } else if (addr instanceof Inet6Address) { |
| mConfig.routes.add(new RouteInfo(new IpPrefix(addr, 128), RTN_THROW)); |
| } else { |
| Log.e(TAG, "Unknown IP address family for VPN endpoint: " + endpoint); |
| } |
| } catch (IllegalArgumentException e) { |
| Log.e(TAG, "Exception constructing throw route to " + endpoint + ": " + e); |
| } |
| } |
| |
| // Here is the last step and it must be done synchronously. |
| synchronized (Vpn.this) { |
| // Set the start time |
| mConfig.startTime = SystemClock.elapsedRealtime(); |
| |
| // 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; |
| mVpnUsers = new ArrayList<UidRange>(); |
| |
| agentConnect(); |
| |
| Log.i(TAG, "Connected!"); |
| } |
| } catch (Exception e) { |
| Log.i(TAG, "Aborting", e); |
| updateState(DetailedState.FAILED, e.getMessage()); |
| exit(); |
| } finally { |
| // Kill the daemons if they fail to stop. |
| if (!initFinished) { |
| for (String daemon : mDaemons) { |
| SystemService.stop(daemon); |
| } |
| } |
| |
| // Do not leave an unstable state. |
| if (!initFinished || mNetworkInfo.getDetailedState() == DetailedState.CONNECTING) { |
| agentDisconnect(); |
| } |
| } |
| } |
| |
| /** |
| * Monitor the daemons we started, moving to disconnected state if the |
| * underlying services fail. |
| */ |
| private void monitorDaemons() { |
| if (!mNetworkInfo.isConnected()) { |
| return; |
| } |
| |
| try { |
| while (true) { |
| Thread.sleep(2000); |
| for (int i = 0; i < mDaemons.length; i++) { |
| if (mArguments[i] != null && SystemService.isStopped(mDaemons[i])) { |
| return; |
| } |
| } |
| } |
| } catch (InterruptedException e) { |
| Log.d(TAG, "interrupted during monitorDaemons(); stopping services"); |
| } finally { |
| for (String daemon : mDaemons) { |
| SystemService.stop(daemon); |
| } |
| |
| agentDisconnect(); |
| } |
| } |
| } |
| } |
