diff options
Diffstat (limited to 'src/se/leap/openvpn/OpenVpnManagementThread.java')
| -rw-r--r-- | src/se/leap/openvpn/OpenVpnManagementThread.java | 577 |
1 files changed, 577 insertions, 0 deletions
diff --git a/src/se/leap/openvpn/OpenVpnManagementThread.java b/src/se/leap/openvpn/OpenVpnManagementThread.java new file mode 100644 index 00000000..43d4f701 --- /dev/null +++ b/src/se/leap/openvpn/OpenVpnManagementThread.java @@ -0,0 +1,577 @@ +package se.leap.openvpn;
+
+import java.io.FileDescriptor;
+import java.io.IOException;
+import java.io.InputStream;
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+import java.net.InetSocketAddress;
+import java.net.SocketAddress;
+import java.security.InvalidKeyException;
+import java.security.NoSuchAlgorithmException;
+import java.security.PrivateKey;
+import java.util.LinkedList;
+import java.util.Vector;
+
+import javax.crypto.BadPaddingException;
+import javax.crypto.Cipher;
+import javax.crypto.IllegalBlockSizeException;
+import javax.crypto.NoSuchPaddingException;
+import se.leap.leapclient.R;
+
+import android.content.SharedPreferences;
+import android.net.LocalServerSocket;
+import android.net.LocalSocket;
+import android.os.Build;
+import android.os.ParcelFileDescriptor;
+import android.preference.PreferenceManager;
+import android.util.Base64;
+import android.util.Log;
+
+public class OpenVpnManagementThread implements Runnable {
+
+ private static final String TAG = "openvpn";
+ private LocalSocket mSocket;
+ private VpnProfile mProfile;
+ private OpenVpnService mOpenVPNService;
+ private LinkedList<FileDescriptor> mFDList=new LinkedList<FileDescriptor>();
+ private int mBytecountinterval=2;
+ private long mLastIn=0;
+ private long mLastOut=0;
+ private LocalServerSocket mServerSocket;
+ private boolean mReleaseHold=true;
+ private boolean mWaitingForRelease=false;
+ private long mLastHoldRelease=0;
+
+ private static Vector<OpenVpnManagementThread> active=new Vector<OpenVpnManagementThread>();
+
+ static private native void jniclose(int fdint);
+ static private native byte[] rsasign(byte[] input,int pkey) throws InvalidKeyException;
+
+ public OpenVpnManagementThread(VpnProfile profile, LocalServerSocket mgmtsocket, OpenVpnService openVpnService) {
+ mProfile = profile;
+ mServerSocket = mgmtsocket;
+ mOpenVPNService = openVpnService;
+
+
+ SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(openVpnService);
+ boolean managemeNetworkState = prefs.getBoolean("netchangereconnect", true);
+ if(managemeNetworkState)
+ mReleaseHold=false;
+
+ }
+
+ static {
+ System.loadLibrary("opvpnutil");
+ }
+
+ public void managmentCommand(String cmd) {
+ if(mSocket!=null) {
+ try {
+ mSocket.getOutputStream().write(cmd.getBytes());
+ mSocket.getOutputStream().flush();
+ } catch (IOException e) {
+ // Ignore socket stack traces
+ }
+ }
+ }
+
+
+ @Override
+ public void run() {
+ Log.i(TAG, "Managment Socket Thread started");
+ byte [] buffer =new byte[2048];
+ // mSocket.setSoTimeout(5); // Setting a timeout cannot be that bad
+
+ String pendingInput="";
+ active.add(this);
+
+ try {
+ // Wait for a client to connect
+ mSocket= mServerSocket.accept();
+ InputStream instream = mSocket.getInputStream();
+
+ while(true) {
+ int numbytesread = instream.read(buffer);
+ if(numbytesread==-1)
+ return;
+
+ FileDescriptor[] fds = null;
+ try {
+ fds = mSocket.getAncillaryFileDescriptors();
+ } catch (IOException e) {
+ OpenVPN.logMessage(0, "", "Error reading fds from socket" + e.getLocalizedMessage());
+ e.printStackTrace();
+ }
+ if(fds!=null){
+
+ for (FileDescriptor fd : fds) {
+
+ mFDList.add(fd);
+ }
+ }
+
+ String input = new String(buffer,0,numbytesread,"UTF-8");
+
+ pendingInput += input;
+
+ pendingInput=processInput(pendingInput);
+
+
+
+ }
+ } catch (IOException e) {
+ e.printStackTrace();
+ }
+ active.remove(this);
+ }
+
+ //! Hack O Rama 2000!
+ private void protectFileDescriptor(FileDescriptor fd) {
+ Exception exp=null;
+ try {
+ Method getInt = FileDescriptor.class.getDeclaredMethod("getInt$");
+ int fdint = (Integer) getInt.invoke(fd);
+
+ // You can even get more evil by parsing toString() and extract the int from that :)
+
+ mOpenVPNService.protect(fdint);
+
+ //ParcelFileDescriptor pfd = ParcelFileDescriptor.fromFd(fdint);
+ //pfd.close();
+ jniclose(fdint);
+ return;
+ } catch (NoSuchMethodException e) {
+ exp =e;
+ } catch (IllegalArgumentException e) {
+ exp =e;
+ } catch (IllegalAccessException e) {
+ exp =e;
+ } catch (InvocationTargetException e) {
+ exp =e;
+ } catch (NullPointerException e) {
+ exp =e;
+ }
+ if(exp!=null) {
+ exp.printStackTrace();
+ Log.d("Openvpn", "Failed to retrieve fd from socket: " + fd);
+ OpenVPN.logMessage(0, "", "Failed to retrieve fd from socket: " + exp.getLocalizedMessage());
+ }
+ }
+
+ private String processInput(String pendingInput) {
+
+
+ while(pendingInput.contains("\n")) {
+ String[] tokens = pendingInput.split("\\r?\\n", 2);
+ processCommand(tokens[0]);
+ if(tokens.length == 1)
+ // No second part, newline was at the end
+ pendingInput="";
+ else
+ pendingInput=tokens[1];
+ }
+ return pendingInput;
+ }
+
+
+ private void processCommand(String command) {
+ if (command.startsWith(">") && command.contains(":")) {
+ String[] parts = command.split(":",2);
+ String cmd = parts[0].substring(1);
+ String argument = parts[1];
+
+
+ if(cmd.equals("INFO")) {
+ // Ignore greeting from mgmt
+ //logStatusMessage(command);
+ }else if (cmd.equals("PASSWORD")) {
+ processPWCommand(argument);
+ } else if (cmd.equals("HOLD")) {
+ handleHold();
+ } else if (cmd.equals("NEED-OK")) {
+ processNeedCommand(argument);
+ } else if (cmd.equals("BYTECOUNT")){
+ processByteCount(argument);
+ } else if (cmd.equals("STATE")) {
+ processState(argument);
+ } else if (cmd.equals("PROXY")) {
+ processProxyCMD(argument);
+ } else if (cmd.equals("LOG")) {
+ String[] args = argument.split(",",3);
+ // 0 unix time stamp
+ // 1 log level N,I,E etc.
+ // 2 log message
+ OpenVPN.logMessage(0, "", args[2]);
+ } else if (cmd.equals("RSA_SIGN")) {
+ processSignCommand(argument);
+ } else {
+ OpenVPN.logMessage(0, "MGMT:", "Got unrecognized command" + command);
+ Log.i(TAG, "Got unrecognized command" + command);
+ }
+ } else if (command.startsWith("SUCCESS:")) {
+ // ignore
+ } else {
+ Log.i(TAG, "Got unrecognized line from managment" + command);
+ OpenVPN.logMessage(0, "MGMT:", "Got unrecognized line from management:" + command);
+ }
+ }
+ private void handleHold() {
+ if(mReleaseHold) {
+ releaseHoldCmd();
+ } else {
+ mWaitingForRelease=true;
+ OpenVPN.updateStateString("NONETWORK", "",R.string.state_nonetwork);
+ }
+ }
+ private void releaseHoldCmd() {
+ if ((System.currentTimeMillis()- mLastHoldRelease) < 5000) {
+ try {
+ Thread.sleep(3000);
+ } catch (InterruptedException e) {}
+
+ }
+ mWaitingForRelease=false;
+ mLastHoldRelease = System.currentTimeMillis();
+ managmentCommand("hold release\n");
+ managmentCommand("bytecount " + mBytecountinterval + "\n");
+ managmentCommand("state on\n");
+ }
+
+ public void releaseHold() {
+ mReleaseHold=true;
+ if(mWaitingForRelease)
+ releaseHoldCmd();
+
+ }
+
+ private void processProxyCMD(String argument) {
+ String[] args = argument.split(",",3);
+ SocketAddress proxyaddr = ProxyDetection.detectProxy(mProfile);
+
+
+ if(args.length >= 2) {
+ String proto = args[1];
+ if(proto.equals("UDP")) {
+ proxyaddr=null;
+ }
+ }
+
+ if(proxyaddr instanceof InetSocketAddress ){
+ InetSocketAddress isa = (InetSocketAddress) proxyaddr;
+
+ OpenVPN.logInfo(R.string.using_proxy, isa.getHostName(),isa.getPort());
+
+ String proxycmd = String.format("proxy HTTP %s %d\n", isa.getHostName(),isa.getPort());
+ managmentCommand(proxycmd);
+ } else {
+ managmentCommand("proxy NONE\n");
+ }
+
+ }
+ private void processState(String argument) {
+ String[] args = argument.split(",",3);
+ String currentstate = args[1];
+ if(args[2].equals(",,"))
+ OpenVPN.updateStateString(currentstate,"");
+ else
+ OpenVPN.updateStateString(currentstate,args[2]);
+ }
+
+
+ private void processByteCount(String argument) {
+ // >BYTECOUNT:{BYTES_IN},{BYTES_OUT}
+ int comma = argument.indexOf(',');
+ long in = Long.parseLong(argument.substring(0, comma));
+ long out = Long.parseLong(argument.substring(comma+1));
+
+ long diffin = in - mLastIn;
+ long diffout = out - mLastOut;
+
+ mLastIn=in;
+ mLastOut=out;
+
+ String netstat = String.format("In: %8s, %8s/s Out %8s, %8s/s",
+ humanReadableByteCount(in, false),
+ humanReadableByteCount(diffin, false),
+ humanReadableByteCount(out, false),
+ humanReadableByteCount(diffout, false));
+ OpenVPN.updateStateString("BYTECOUNT",netstat);
+
+
+ }
+
+ // From: http://stackoverflow.com/questions/3758606/how-to-convert-byte-size-into-human-readable-format-in-java
+ public static String humanReadableByteCount(long bytes, boolean si) {
+ int unit = si ? 1000 : 1024;
+ if (bytes < unit) return bytes + " B";
+ int exp = (int) (Math.log(bytes) / Math.log(unit));
+ String pre = (si ? "kMGTPE" : "KMGTPE").charAt(exp-1) + (si ? "" : "i");
+ return String.format("%.1f %sB", bytes / Math.pow(unit, exp), pre);
+ }
+
+ private void processNeedCommand(String argument) {
+ int p1 =argument.indexOf('\'');
+ int p2 = argument.indexOf('\'',p1+1);
+
+ String needed = argument.substring(p1+1, p2);
+ String extra = argument.split(":",2)[1];
+
+ String status = "ok";
+
+
+ if (needed.equals("PROTECTFD")) {
+ FileDescriptor fdtoprotect = mFDList.pollFirst();
+ protectFileDescriptor(fdtoprotect);
+ } else if (needed.equals("DNSSERVER")) {
+ mOpenVPNService.addDNS(extra);
+ }else if (needed.equals("DNSDOMAIN")){
+ mOpenVPNService.setDomain(extra);
+ } else if (needed.equals("ROUTE")) {
+ String[] routeparts = extra.split(" ");
+ mOpenVPNService.addRoute(routeparts[0], routeparts[1]);
+ } else if (needed.equals("ROUTE6")) {
+ mOpenVPNService.addRoutev6(extra);
+ } else if (needed.equals("IFCONFIG")) {
+ String[] ifconfigparts = extra.split(" ");
+ int mtu = Integer.parseInt(ifconfigparts[2]);
+ mOpenVPNService.setLocalIP(ifconfigparts[0], ifconfigparts[1],mtu,ifconfigparts[3]);
+ } else if (needed.equals("IFCONFIG6")) {
+ mOpenVPNService.setLocalIPv6(extra);
+
+ } else if (needed.equals("OPENTUN")) {
+ if(sendTunFD(needed,extra))
+ return;
+ else
+ status="cancel";
+ // This not nice or anything but setFileDescriptors accepts only FilDescriptor class :(
+
+ } else {
+ Log.e(TAG,"Unkown needok command " + argument);
+ return;
+ }
+
+ String cmd = String.format("needok '%s' %s\n", needed, status);
+ managmentCommand(cmd);
+ }
+
+ private boolean sendTunFD (String needed, String extra) {
+ Exception exp = null;
+ if(!extra.equals("tun")) {
+ // We only support tun
+ String errmsg = String.format("Devicetype %s requested, but only tun is possible with the Android API, sorry!",extra);
+ OpenVPN.logMessage(0, "", errmsg );
+
+ return false;
+ }
+ ParcelFileDescriptor pfd = mOpenVPNService.openTun();
+ if(pfd==null)
+ return false;
+
+ Method setInt;
+ int fdint = pfd.getFd();
+ try {
+ setInt = FileDescriptor.class.getDeclaredMethod("setInt$",int.class);
+ FileDescriptor fdtosend = new FileDescriptor();
+
+ setInt.invoke(fdtosend,fdint);
+
+ FileDescriptor[] fds = {fdtosend};
+ mSocket.setFileDescriptorsForSend(fds);
+
+ Log.d("Openvpn", "Sending FD tosocket: " + fdtosend + " " + fdint + " " + pfd);
+ // Trigger a send so we can close the fd on our side of the channel
+ // The API documentation fails to mention that it will not reset the file descriptor to
+ // be send and will happily send the file descriptor on every write ...
+ String cmd = String.format("needok '%s' %s\n", needed, "ok");
+ managmentCommand(cmd);
+
+ // Set the FileDescriptor to null to stop this mad behavior
+ mSocket.setFileDescriptorsForSend(null);
+
+ pfd.close();
+
+ return true;
+ } catch (NoSuchMethodException e) {
+ exp =e;
+ } catch (IllegalArgumentException e) {
+ exp =e;
+ } catch (IllegalAccessException e) {
+ exp =e;
+ } catch (InvocationTargetException e) {
+ exp =e;
+ } catch (IOException e) {
+ exp =e;
+ }
+ if(exp!=null) {
+ OpenVPN.logMessage(0,"", "Could not send fd over socket:" + exp.getLocalizedMessage());
+ exp.printStackTrace();
+ }
+ return false;
+ }
+
+ private void processPWCommand(String argument) {
+ //argument has the form Need 'Private Key' password
+ // or ">PASSWORD:Verification Failed: '%s' ['%s']"
+ String needed;
+
+
+
+ try{
+
+ int p1 = argument.indexOf('\'');
+ int p2 = argument.indexOf('\'',p1+1);
+ needed = argument.substring(p1+1, p2);
+ if (argument.startsWith("Verification Failed")) {
+ proccessPWFailed(needed, argument.substring(p2+1));
+ return;
+ }
+ } catch (StringIndexOutOfBoundsException sioob) {
+ OpenVPN.logMessage(0, "", "Could not parse management Password command: " + argument);
+ return;
+ }
+
+ String pw=null;
+
+ if(needed.equals("Private Key")) {
+ pw = mProfile.getPasswordPrivateKey();
+ } else if (needed.equals("Auth")) {
+ String usercmd = String.format("username '%s' %s\n",
+ needed, VpnProfile.openVpnEscape(mProfile.mUsername));
+ managmentCommand(usercmd);
+ pw = mProfile.getPasswordAuth();
+ }
+ if(pw!=null) {
+ String cmd = String.format("password '%s' %s\n", needed, VpnProfile.openVpnEscape(pw));
+ managmentCommand(cmd);
+ } else {
+ OpenVPN.logMessage(0, OpenVPN.MANAGMENT_PREFIX, String.format("Openvpn requires Authentication type '%s' but no password/key information available", needed));
+ }
+
+ }
+
+
+
+
+ private void proccessPWFailed(String needed, String args) {
+ OpenVPN.updateStateString("AUTH_FAILED", needed + args,R.string.state_auth_failed);
+ }
+ private void logStatusMessage(String command) {
+ OpenVPN.logMessage(0,"MGMT:", command);
+ }
+
+
+ public static boolean stopOpenVPN() {
+ boolean sendCMD=false;
+ for (OpenVpnManagementThread mt: active){
+ mt.managmentCommand("signal SIGINT\n");
+ sendCMD=true;
+ try {
+ if(mt.mSocket !=null)
+ mt.mSocket.close();
+ } catch (IOException e) {
+ // Ignore close error on already closed socket
+ }
+ }
+ return sendCMD;
+ }
+
+ public void signalusr1() {
+ mReleaseHold=false;
+ if(!mWaitingForRelease)
+ managmentCommand("signal SIGUSR1\n");
+ }
+
+ public void reconnect() {
+ signalusr1();
+ releaseHold();
+ }
+
+ private void processSignCommand(String b64data) {
+
+ PrivateKey privkey = mProfile.getKeystoreKey();
+ Exception err =null;
+
+ byte[] data = Base64.decode(b64data, Base64.DEFAULT);
+
+ // The Jelly Bean *evil* Hack
+ // 4.2 implements the RSA/ECB/PKCS1PADDING in the OpenSSLprovider
+ if(Build.VERSION.SDK_INT==16){
+ processSignJellyBeans(privkey,data);
+ return;
+ }
+
+
+ try{
+
+
+ Cipher rsasinger = Cipher.getInstance("RSA/ECB/PKCS1PADDING");
+
+ rsasinger.init(Cipher.ENCRYPT_MODE, privkey);
+
+ byte[] signed_bytes = rsasinger.doFinal(data);
+ String signed_string = Base64.encodeToString(signed_bytes, Base64.NO_WRAP);
+ managmentCommand("rsa-sig\n");
+ managmentCommand(signed_string);
+ managmentCommand("\nEND\n");
+ } catch (NoSuchAlgorithmException e){
+ err =e;
+ } catch (InvalidKeyException e) {
+ err =e;
+ } catch (NoSuchPaddingException e) {
+ err =e;
+ } catch (IllegalBlockSizeException e) {
+ err =e;
+ } catch (BadPaddingException e) {
+ err =e;
+ }
+ if(err !=null) {
+ OpenVPN.logError(R.string.error_rsa_sign,err.getClass().toString(),err.getLocalizedMessage());
+ }
+
+ }
+
+
+ private void processSignJellyBeans(PrivateKey privkey, byte[] data) {
+ Exception err =null;
+ try {
+ Method[] allm = privkey.getClass().getSuperclass().getDeclaredMethods();
+ System.out.println(allm);
+ Method getKey = privkey.getClass().getSuperclass().getDeclaredMethod("getOpenSSLKey");
+ getKey.setAccessible(true);
+
+ // Real object type is OpenSSLKey
+ Object opensslkey = getKey.invoke(privkey);
+
+ getKey.setAccessible(false);
+
+ Method getPkeyContext = opensslkey.getClass().getDeclaredMethod("getPkeyContext");
+
+ // integer pointer to EVP_pkey
+ getPkeyContext.setAccessible(true);
+ int pkey = (Integer) getPkeyContext.invoke(opensslkey);
+ getPkeyContext.setAccessible(false);
+
+ byte[] signed_bytes = rsasign(data, pkey);
+ String signed_string = Base64.encodeToString(signed_bytes, Base64.NO_WRAP);
+ managmentCommand("rsa-sig\n");
+ managmentCommand(signed_string);
+ managmentCommand("\nEND\n");
+
+ } catch (NoSuchMethodException e) {
+ err=e;
+ } catch (IllegalArgumentException e) {
+ err=e;
+ } catch (IllegalAccessException e) {
+ err=e;
+ } catch (InvocationTargetException e) {
+ err=e;
+ } catch (InvalidKeyException e) {
+ err=e;
+ }
+ if(err !=null) {
+ OpenVPN.logError(R.string.error_rsa_sign,err.getClass().toString(),err.getLocalizedMessage());
+ }
+
+ }
+}
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