1package eu.siacs.conversations.xmpp;
2
3import android.content.Context;
4import android.content.SharedPreferences;
5import android.os.Bundle;
6import android.os.Parcelable;
7import android.os.PowerManager;
8import android.os.PowerManager.WakeLock;
9import android.os.SystemClock;
10import android.preference.PreferenceManager;
11import android.util.Log;
12import android.util.Pair;
13import android.util.SparseArray;
14
15import org.apache.http.conn.ssl.StrictHostnameVerifier;
16import org.json.JSONException;
17import org.json.JSONObject;
18import org.xmlpull.v1.XmlPullParserException;
19
20import java.io.IOException;
21import java.io.InputStream;
22import java.io.OutputStream;
23import java.math.BigInteger;
24import java.net.ConnectException;
25import java.net.IDN;
26import java.net.InetAddress;
27import java.net.InetSocketAddress;
28import java.net.Socket;
29import java.net.UnknownHostException;
30import java.security.KeyManagementException;
31import java.security.NoSuchAlgorithmException;
32import java.util.ArrayList;
33import java.util.Arrays;
34import java.util.Collection;
35import java.util.HashMap;
36import java.util.Hashtable;
37import java.util.Iterator;
38import java.util.LinkedList;
39import java.util.List;
40import java.util.Map;
41import java.util.Map.Entry;
42
43import javax.net.ssl.HostnameVerifier;
44import javax.net.ssl.SSLContext;
45import javax.net.ssl.SSLSocket;
46import javax.net.ssl.SSLSocketFactory;
47import javax.net.ssl.X509TrustManager;
48
49import eu.siacs.conversations.Config;
50import eu.siacs.conversations.crypto.sasl.DigestMd5;
51import eu.siacs.conversations.crypto.sasl.Plain;
52import eu.siacs.conversations.crypto.sasl.SaslMechanism;
53import eu.siacs.conversations.crypto.sasl.ScramSha1;
54import eu.siacs.conversations.entities.Account;
55import eu.siacs.conversations.generator.IqGenerator;
56import eu.siacs.conversations.services.XmppConnectionService;
57import eu.siacs.conversations.utils.CryptoHelper;
58import eu.siacs.conversations.utils.DNSHelper;
59import eu.siacs.conversations.utils.Xmlns;
60import eu.siacs.conversations.xml.Element;
61import eu.siacs.conversations.xml.Tag;
62import eu.siacs.conversations.xml.TagWriter;
63import eu.siacs.conversations.xml.XmlReader;
64import eu.siacs.conversations.xmpp.jid.InvalidJidException;
65import eu.siacs.conversations.xmpp.jid.Jid;
66import eu.siacs.conversations.xmpp.jingle.OnJinglePacketReceived;
67import eu.siacs.conversations.xmpp.jingle.stanzas.JinglePacket;
68import eu.siacs.conversations.xmpp.stanzas.AbstractStanza;
69import eu.siacs.conversations.xmpp.stanzas.IqPacket;
70import eu.siacs.conversations.xmpp.stanzas.MessagePacket;
71import eu.siacs.conversations.xmpp.stanzas.PresencePacket;
72import eu.siacs.conversations.xmpp.stanzas.csi.ActivePacket;
73import eu.siacs.conversations.xmpp.stanzas.csi.InactivePacket;
74import eu.siacs.conversations.xmpp.stanzas.streammgmt.AckPacket;
75import eu.siacs.conversations.xmpp.stanzas.streammgmt.EnablePacket;
76import eu.siacs.conversations.xmpp.stanzas.streammgmt.RequestPacket;
77import eu.siacs.conversations.xmpp.stanzas.streammgmt.ResumePacket;
78
79public class XmppConnection implements Runnable {
80
81 private static final int PACKET_IQ = 0;
82 private static final int PACKET_MESSAGE = 1;
83 private static final int PACKET_PRESENCE = 2;
84 protected Account account;
85 private final WakeLock wakeLock;
86 private Socket socket;
87 private XmlReader tagReader;
88 private TagWriter tagWriter;
89 private final Features features = new Features(this);
90 private boolean shouldBind = true;
91 private boolean shouldAuthenticate = true;
92 private Element streamFeatures;
93 private final HashMap<Jid, Info> disco = new HashMap<>();
94
95 private String streamId = null;
96 private int smVersion = 3;
97 private final SparseArray<String> mStanzaReceipts = new SparseArray<>();
98
99 private int stanzasReceived = 0;
100 private int stanzasSent = 0;
101 private long lastPacketReceived = 0;
102 private long lastPingSent = 0;
103 private long lastConnect = 0;
104 private long lastSessionStarted = 0;
105 private int attempt = 0;
106 private final Map<String, Pair<IqPacket, OnIqPacketReceived>> packetCallbacks = new Hashtable<>();
107 private OnPresencePacketReceived presenceListener = null;
108 private OnJinglePacketReceived jingleListener = null;
109 private OnIqPacketReceived unregisteredIqListener = null;
110 private OnMessagePacketReceived messageListener = null;
111 private OnStatusChanged statusListener = null;
112 private OnBindListener bindListener = null;
113 private final ArrayList<OnAdvancedStreamFeaturesLoaded> advancedStreamFeaturesLoadedListeners = new ArrayList<>();
114 private OnMessageAcknowledged acknowledgedListener = null;
115 private XmppConnectionService mXmppConnectionService = null;
116
117 private SaslMechanism saslMechanism;
118
119 public XmppConnection(final Account account, final XmppConnectionService service) {
120 this.account = account;
121 this.wakeLock = service.getPowerManager().newWakeLock(
122 PowerManager.PARTIAL_WAKE_LOCK, account.getJid().toBareJid().toString());
123 tagWriter = new TagWriter();
124 mXmppConnectionService = service;
125 }
126
127 protected void changeStatus(final Account.State nextStatus) {
128 if (account.getStatus() != nextStatus) {
129 if ((nextStatus == Account.State.OFFLINE)
130 && (account.getStatus() != Account.State.CONNECTING)
131 && (account.getStatus() != Account.State.ONLINE)
132 && (account.getStatus() != Account.State.DISABLED)) {
133 return;
134 }
135 if (nextStatus == Account.State.ONLINE) {
136 this.attempt = 0;
137 }
138 account.setStatus(nextStatus);
139 if (statusListener != null) {
140 statusListener.onStatusChanged(account);
141 }
142 }
143 }
144
145 protected void connect() {
146 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": connecting");
147 features.encryptionEnabled = false;
148 lastConnect = SystemClock.elapsedRealtime();
149 lastPingSent = SystemClock.elapsedRealtime();
150 this.attempt++;
151 try {
152 shouldAuthenticate = shouldBind = !account.isOptionSet(Account.OPTION_REGISTER);
153 tagReader = new XmlReader(wakeLock);
154 tagWriter = new TagWriter();
155 packetCallbacks.clear();
156 this.changeStatus(Account.State.CONNECTING);
157 if (DNSHelper.isIp(account.getServer().toString())) {
158 socket = new Socket();
159 try {
160 socket.connect(new InetSocketAddress(account.getServer().toString(), 5222), Config.SOCKET_TIMEOUT * 1000);
161 } catch (IOException e) {
162 throw new UnknownHostException();
163 }
164 } else {
165 final Bundle result = DNSHelper.getSRVRecord(account.getServer());
166 if (result == null) {
167 throw new IOException("unhandled exception in DNS resolver");
168 }
169 final ArrayList<Parcelable> values = result.getParcelableArrayList("values");
170 if ("timeout".equals(result.getString("error"))) {
171 throw new IOException("timeout in dns");
172 } else if (values != null) {
173 int i = 0;
174 boolean socketError = true;
175 while (socketError && values.size() > i) {
176 final Bundle namePort = (Bundle) values.get(i);
177 try {
178 String srvRecordServer;
179 try {
180 srvRecordServer = IDN.toASCII(namePort.getString("name"));
181 } catch (final IllegalArgumentException e) {
182 // TODO: Handle me?`
183 srvRecordServer = "";
184 }
185 final int srvRecordPort = namePort.getInt("port");
186 final String srvIpServer = namePort.getString("ip");
187 final InetSocketAddress addr;
188 if (srvIpServer != null) {
189 addr = new InetSocketAddress(srvIpServer, srvRecordPort);
190 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
191 + ": using values from dns " + srvRecordServer
192 + "[" + srvIpServer + "]:" + srvRecordPort);
193 } else {
194 addr = new InetSocketAddress(srvRecordServer, srvRecordPort);
195 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
196 + ": using values from dns "
197 + srvRecordServer + ":" + srvRecordPort);
198 }
199 socket = new Socket();
200 socket.connect(addr, Config.SOCKET_TIMEOUT * 1000);
201 socketError = false;
202 } catch (final UnknownHostException e) {
203 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": " + e.getMessage());
204 i++;
205 } catch (final IOException e) {
206 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": " + e.getMessage());
207 i++;
208 }
209 }
210 if (socketError) {
211 throw new UnknownHostException();
212 }
213 } else {
214 throw new IOException("unhandled exception in DNS resolver");
215 }
216 }
217 final OutputStream out = socket.getOutputStream();
218 tagWriter.setOutputStream(out);
219 final InputStream in = socket.getInputStream();
220 tagReader.setInputStream(in);
221 tagWriter.beginDocument();
222 sendStartStream();
223 Tag nextTag;
224 while ((nextTag = tagReader.readTag()) != null) {
225 if (nextTag.isStart("stream")) {
226 processStream(nextTag);
227 break;
228 } else {
229 throw new IOException("unknown tag on connect");
230 }
231 }
232 if (socket.isConnected()) {
233 socket.close();
234 }
235 } catch (final IncompatibleServerException e) {
236 this.changeStatus(Account.State.INCOMPATIBLE_SERVER);
237 } catch (final SecurityException e) {
238 this.changeStatus(Account.State.SECURITY_ERROR);
239 } catch (final UnauthorizedException e) {
240 this.changeStatus(Account.State.UNAUTHORIZED);
241 } catch (final UnknownHostException | ConnectException e) {
242 this.changeStatus(Account.State.SERVER_NOT_FOUND);
243 } catch (final IOException | XmlPullParserException | NoSuchAlgorithmException e) {
244 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": " + e.getMessage());
245 this.changeStatus(Account.State.OFFLINE);
246 this.attempt--; //don't count attempt when reconnecting instantly anyway
247 } finally {
248 if (socket != null) {
249 try {
250 socket.close();
251 } catch (IOException e) {
252
253 }
254 }
255 if (wakeLock.isHeld()) {
256 try {
257 wakeLock.release();
258 } catch (final RuntimeException ignored) {
259 }
260 }
261 }
262 }
263
264 @Override
265 public void run() {
266 try {
267 if (socket != null) {
268 socket.close();
269 }
270 } catch (final IOException ignored) {
271
272 }
273 connect();
274 }
275
276 private void processStream(final Tag currentTag) throws XmlPullParserException,
277 IOException, NoSuchAlgorithmException {
278 Tag nextTag = tagReader.readTag();
279
280 while ((nextTag != null) && (!nextTag.isEnd("stream"))) {
281 if (nextTag.isStart("error")) {
282 processStreamError(nextTag);
283 } else if (nextTag.isStart("features")) {
284 processStreamFeatures(nextTag);
285 } else if (nextTag.isStart("proceed")) {
286 switchOverToTls(nextTag);
287 } else if (nextTag.isStart("success")) {
288 final String challenge = tagReader.readElement(nextTag).getContent();
289 try {
290 saslMechanism.getResponse(challenge);
291 } catch (final SaslMechanism.AuthenticationException e) {
292 disconnect(true);
293 Log.e(Config.LOGTAG, String.valueOf(e));
294 }
295 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": logged in");
296 account.setKey(Account.PINNED_MECHANISM_KEY,
297 String.valueOf(saslMechanism.getPriority()));
298 tagReader.reset();
299 sendStartStream();
300 processStream(tagReader.readTag());
301 break;
302 } else if (nextTag.isStart("failure")) {
303 throw new UnauthorizedException();
304 } else if (nextTag.isStart("challenge")) {
305 final String challenge = tagReader.readElement(nextTag).getContent();
306 final Element response = new Element("response");
307 response.setAttribute("xmlns",
308 "urn:ietf:params:xml:ns:xmpp-sasl");
309 try {
310 response.setContent(saslMechanism.getResponse(challenge));
311 } catch (final SaslMechanism.AuthenticationException e) {
312 // TODO: Send auth abort tag.
313 Log.e(Config.LOGTAG, e.toString());
314 }
315 tagWriter.writeElement(response);
316 } else if (nextTag.isStart("enabled")) {
317 final Element enabled = tagReader.readElement(nextTag);
318 if ("true".equals(enabled.getAttribute("resume"))) {
319 this.streamId = enabled.getAttribute("id");
320 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
321 + ": stream managment(" + smVersion
322 + ") enabled (resumable)");
323 } else {
324 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
325 + ": stream managment(" + smVersion + ") enabled");
326 }
327 this.lastSessionStarted = SystemClock.elapsedRealtime();
328 this.stanzasReceived = 0;
329 final RequestPacket r = new RequestPacket(smVersion);
330 tagWriter.writeStanzaAsync(r);
331 } else if (nextTag.isStart("resumed")) {
332 lastPacketReceived = SystemClock.elapsedRealtime();
333 final Element resumed = tagReader.readElement(nextTag);
334 final String h = resumed.getAttribute("h");
335 try {
336 final int serverCount = Integer.parseInt(h);
337 if (serverCount != stanzasSent) {
338 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
339 + ": session resumed with lost packages");
340 stanzasSent = serverCount;
341 } else {
342 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": session resumed");
343 }
344 acknowledgeStanzaUpTo(serverCount);
345 ArrayList<IqPacket> failedIqPackets = new ArrayList<>();
346 for(int i = 0; i < this.mStanzaReceipts.size(); ++i) {
347 String id = mStanzaReceipts.valueAt(i);
348 Pair<IqPacket,OnIqPacketReceived> pair = id == null ? null : this.packetCallbacks.get(id);
349 if (pair != null) {
350 failedIqPackets.add(pair.first);
351 }
352 }
353 mStanzaReceipts.clear();
354 Log.d(Config.LOGTAG,"resending "+failedIqPackets.size()+" iq stanza");
355 for(IqPacket packet : failedIqPackets) {
356 sendUnmodifiedIqPacket(packet,null);
357 }
358 } catch (final NumberFormatException ignored) {
359 }
360 sendInitialPing();
361 } else if (nextTag.isStart("r")) {
362 tagReader.readElement(nextTag);
363 if (Config.EXTENDED_SM_LOGGING) {
364 Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": acknowledging stanza #" + this.stanzasReceived);
365 }
366 final AckPacket ack = new AckPacket(this.stanzasReceived, smVersion);
367 tagWriter.writeStanzaAsync(ack);
368 } else if (nextTag.isStart("a")) {
369 final Element ack = tagReader.readElement(nextTag);
370 lastPacketReceived = SystemClock.elapsedRealtime();
371 try {
372 final int serverSequence = Integer.parseInt(ack.getAttribute("h"));
373 acknowledgeStanzaUpTo(serverSequence);
374 } catch (NumberFormatException e) {
375 Log.d(Config.LOGTAG,account.getJid().toBareJid()+": server send ack without sequence number");
376 }
377 } else if (nextTag.isStart("failed")) {
378 tagReader.readElement(nextTag);
379 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": resumption failed");
380 streamId = null;
381 if (account.getStatus() != Account.State.ONLINE) {
382 sendBindRequest();
383 }
384 } else if (nextTag.isStart("iq")) {
385 processIq(nextTag);
386 } else if (nextTag.isStart("message")) {
387 processMessage(nextTag);
388 } else if (nextTag.isStart("presence")) {
389 processPresence(nextTag);
390 }
391 nextTag = tagReader.readTag();
392 }
393 if (account.getStatus() == Account.State.ONLINE) {
394 account. setStatus(Account.State.OFFLINE);
395 if (statusListener != null) {
396 statusListener.onStatusChanged(account);
397 }
398 }
399 }
400
401 private void acknowledgeStanzaUpTo(int serverCount) {
402 for (int i = 0; i < mStanzaReceipts.size(); ++i) {
403 if (serverCount >= mStanzaReceipts.keyAt(i)) {
404 if (Config.EXTENDED_SM_LOGGING) {
405 Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": server acknowledged stanza #" + mStanzaReceipts.keyAt(i));
406 }
407 String id = mStanzaReceipts.valueAt(i);
408 if (acknowledgedListener != null) {
409 acknowledgedListener.onMessageAcknowledged(account, id);
410 }
411 mStanzaReceipts.removeAt(i);
412 i--;
413 }
414 }
415 }
416
417 private void sendInitialPing() {
418 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": sending intial ping");
419 final IqPacket iq = new IqPacket(IqPacket.TYPE.GET);
420 iq.setFrom(account.getJid());
421 iq.addChild("ping", "urn:xmpp:ping");
422 this.sendIqPacket(iq, new OnIqPacketReceived() {
423 @Override
424 public void onIqPacketReceived(final Account account, final IqPacket packet) {
425 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
426 + ": online with resource " + account.getResource());
427 changeStatus(Account.State.ONLINE);
428 }
429 });
430 }
431
432 private Element processPacket(final Tag currentTag, final int packetType)
433 throws XmlPullParserException, IOException {
434 Element element;
435 switch (packetType) {
436 case PACKET_IQ:
437 element = new IqPacket();
438 break;
439 case PACKET_MESSAGE:
440 element = new MessagePacket();
441 break;
442 case PACKET_PRESENCE:
443 element = new PresencePacket();
444 break;
445 default:
446 return null;
447 }
448 element.setAttributes(currentTag.getAttributes());
449 Tag nextTag = tagReader.readTag();
450 if (nextTag == null) {
451 throw new IOException("interrupted mid tag");
452 }
453 while (!nextTag.isEnd(element.getName())) {
454 if (!nextTag.isNo()) {
455 final Element child = tagReader.readElement(nextTag);
456 final String type = currentTag.getAttribute("type");
457 if (packetType == PACKET_IQ
458 && "jingle".equals(child.getName())
459 && ("set".equalsIgnoreCase(type) || "get"
460 .equalsIgnoreCase(type))) {
461 element = new JinglePacket();
462 element.setAttributes(currentTag.getAttributes());
463 }
464 element.addChild(child);
465 }
466 nextTag = tagReader.readTag();
467 if (nextTag == null) {
468 throw new IOException("interrupted mid tag");
469 }
470 }
471 if (stanzasReceived == Integer.MAX_VALUE) {
472 resetStreamId();
473 throw new IOException("time to restart the session. cant handle >2 billion pcks");
474 }
475 ++stanzasReceived;
476 lastPacketReceived = SystemClock.elapsedRealtime();
477 return element;
478 }
479
480 private void processIq(final Tag currentTag) throws XmlPullParserException, IOException {
481 final IqPacket packet = (IqPacket) processPacket(currentTag, PACKET_IQ);
482
483 if (packet.getId() == null) {
484 return; // an iq packet without id is definitely invalid
485 }
486
487 if (packet instanceof JinglePacket) {
488 if (this.jingleListener != null) {
489 this.jingleListener.onJinglePacketReceived(account,(JinglePacket) packet);
490 }
491 } else {
492 if (packetCallbacks.containsKey(packet.getId())) {
493 final Pair<IqPacket, OnIqPacketReceived> packetCallbackDuple = packetCallbacks.get(packet.getId());
494 // Packets to the server should have responses from the server
495 if (packetCallbackDuple.first.toServer(account)) {
496 if (packet.fromServer(account)) {
497 packetCallbackDuple.second.onIqPacketReceived(account, packet);
498 packetCallbacks.remove(packet.getId());
499 } else {
500 Log.e(Config.LOGTAG,account.getJid().toBareJid().toString()+": ignoring spoofed iq packet");
501 }
502 } else {
503 if (packet.getFrom().equals(packetCallbackDuple.first.getTo())) {
504 packetCallbackDuple.second.onIqPacketReceived(account, packet);
505 packetCallbacks.remove(packet.getId());
506 } else {
507 Log.e(Config.LOGTAG,account.getJid().toBareJid().toString()+": ignoring spoofed iq packet");
508 }
509 }
510 } else if (packet.getType() == IqPacket.TYPE.GET|| packet.getType() == IqPacket.TYPE.SET) {
511 this.unregisteredIqListener.onIqPacketReceived(account, packet);
512 }
513 }
514 }
515
516 private void processMessage(final Tag currentTag) throws XmlPullParserException, IOException {
517 final MessagePacket packet = (MessagePacket) processPacket(currentTag,PACKET_MESSAGE);
518 this.messageListener.onMessagePacketReceived(account, packet);
519 }
520
521 private void processPresence(final Tag currentTag) throws XmlPullParserException, IOException {
522 PresencePacket packet = (PresencePacket) processPacket(currentTag, PACKET_PRESENCE);
523 this.presenceListener.onPresencePacketReceived(account, packet);
524 }
525
526 private void sendStartTLS() throws IOException {
527 final Tag startTLS = Tag.empty("starttls");
528 startTLS.setAttribute("xmlns", "urn:ietf:params:xml:ns:xmpp-tls");
529 tagWriter.writeTag(startTLS);
530 }
531
532 private void switchOverToTls(final Tag currentTag) throws XmlPullParserException, IOException {
533 tagReader.readTag();
534 try {
535 final SSLContext sc = SSLContext.getInstance("TLS");
536 sc.init(null,new X509TrustManager[]{this.mXmppConnectionService.getMemorizingTrustManager()},mXmppConnectionService.getRNG());
537 final SSLSocketFactory factory = sc.getSocketFactory();
538 final HostnameVerifier verifier = this.mXmppConnectionService.getMemorizingTrustManager().wrapHostnameVerifier(new StrictHostnameVerifier());
539 final InetAddress address = socket == null ? null : socket.getInetAddress();
540
541 if (factory == null || address == null || verifier == null) {
542 throw new IOException("could not setup ssl");
543 }
544
545 final SSLSocket sslSocket = (SSLSocket) factory.createSocket(socket,address.getHostAddress(), socket.getPort(),true);
546
547 if (sslSocket == null) {
548 throw new IOException("could not initialize ssl socket");
549 }
550
551 final String[] supportProtocols;
552 final Collection<String> supportedProtocols = new LinkedList<>(
553 Arrays.asList(sslSocket.getSupportedProtocols()));
554 supportedProtocols.remove("SSLv3");
555 supportProtocols = supportedProtocols.toArray(new String[supportedProtocols.size()]);
556
557 sslSocket.setEnabledProtocols(supportProtocols);
558
559 final String[] cipherSuites = CryptoHelper.getOrderedCipherSuites(
560 sslSocket.getSupportedCipherSuites());
561 //Log.d(Config.LOGTAG, "Using ciphers: " + Arrays.toString(cipherSuites));
562 if (cipherSuites.length > 0) {
563 sslSocket.setEnabledCipherSuites(cipherSuites);
564 }
565
566 if (!verifier.verify(account.getServer().getDomainpart(),sslSocket.getSession())) {
567 Log.d(Config.LOGTAG,account.getJid().toBareJid()+": TLS certificate verification failed");
568 throw new SecurityException();
569 }
570 tagReader.setInputStream(sslSocket.getInputStream());
571 tagWriter.setOutputStream(sslSocket.getOutputStream());
572 sendStartStream();
573 Log.d(Config.LOGTAG, account.getJid().toBareJid()+ ": TLS connection established");
574 features.encryptionEnabled = true;
575 processStream(tagReader.readTag());
576 sslSocket.close();
577 } catch (final NoSuchAlgorithmException | KeyManagementException e1) {
578 Log.d(Config.LOGTAG,account.getJid().toBareJid()+": TLS certificate verification failed");
579 throw new SecurityException();
580 }
581 }
582
583 private void processStreamFeatures(final Tag currentTag)
584 throws XmlPullParserException, IOException {
585 this.streamFeatures = tagReader.readElement(currentTag);
586 if (this.streamFeatures.hasChild("starttls") && !features.encryptionEnabled) {
587 sendStartTLS();
588 } else if (this.streamFeatures.hasChild("register")
589 && account.isOptionSet(Account.OPTION_REGISTER)
590 && features.encryptionEnabled) {
591 sendRegistryRequest();
592 } else if (!this.streamFeatures.hasChild("register")
593 && account.isOptionSet(Account.OPTION_REGISTER)) {
594 changeStatus(Account.State.REGISTRATION_NOT_SUPPORTED);
595 disconnect(true);
596 } else if (this.streamFeatures.hasChild("mechanisms")
597 && shouldAuthenticate && features.encryptionEnabled) {
598 final List<String> mechanisms = extractMechanisms(streamFeatures
599 .findChild("mechanisms"));
600 final Element auth = new Element("auth");
601 auth.setAttribute("xmlns", "urn:ietf:params:xml:ns:xmpp-sasl");
602 if (mechanisms.contains("SCRAM-SHA-1")) {
603 saslMechanism = new ScramSha1(tagWriter, account, mXmppConnectionService.getRNG());
604 } else if (mechanisms.contains("PLAIN")) {
605 saslMechanism = new Plain(tagWriter, account);
606 } else if (mechanisms.contains("DIGEST-MD5")) {
607 saslMechanism = new DigestMd5(tagWriter, account, mXmppConnectionService.getRNG());
608 }
609 if (saslMechanism != null) {
610 final JSONObject keys = account.getKeys();
611 try {
612 if (keys.has(Account.PINNED_MECHANISM_KEY) &&
613 keys.getInt(Account.PINNED_MECHANISM_KEY) > saslMechanism.getPriority()) {
614 Log.e(Config.LOGTAG, "Auth failed. Authentication mechanism " + saslMechanism.getMechanism() +
615 " has lower priority (" + String.valueOf(saslMechanism.getPriority()) +
616 ") than pinned priority (" + keys.getInt(Account.PINNED_MECHANISM_KEY) +
617 "). Possible downgrade attack?");
618 throw new SecurityException();
619 }
620 } catch (final JSONException e) {
621 Log.d(Config.LOGTAG, "Parse error while checking pinned auth mechanism");
622 }
623 Log.d(Config.LOGTAG, account.getJid().toString() + ": Authenticating with " + saslMechanism.getMechanism());
624 auth.setAttribute("mechanism", saslMechanism.getMechanism());
625 if (!saslMechanism.getClientFirstMessage().isEmpty()) {
626 auth.setContent(saslMechanism.getClientFirstMessage());
627 }
628 tagWriter.writeElement(auth);
629 } else {
630 throw new IncompatibleServerException();
631 }
632 } else if (this.streamFeatures.hasChild("sm", "urn:xmpp:sm:"
633 + smVersion)
634 && streamId != null) {
635 if (Config.EXTENDED_SM_LOGGING) {
636 Log.d(Config.LOGTAG,account.getJid().toBareJid()+": resuming after stanza #"+stanzasReceived);
637 }
638 final ResumePacket resume = new ResumePacket(this.streamId, stanzasReceived, smVersion);
639 this.tagWriter.writeStanzaAsync(resume);
640 } else if (this.streamFeatures.hasChild("bind") && shouldBind) {
641 sendBindRequest();
642 } else {
643 disconnect(true);
644 changeStatus(Account.State.INCOMPATIBLE_SERVER);
645 }
646 }
647
648 private List<String> extractMechanisms(final Element stream) {
649 final ArrayList<String> mechanisms = new ArrayList<>(stream
650 .getChildren().size());
651 for (final Element child : stream.getChildren()) {
652 mechanisms.add(child.getContent());
653 }
654 return mechanisms;
655 }
656
657 private void sendRegistryRequest() {
658 final IqPacket register = new IqPacket(IqPacket.TYPE.GET);
659 register.query("jabber:iq:register");
660 register.setTo(account.getServer());
661 sendIqPacket(register, new OnIqPacketReceived() {
662
663 @Override
664 public void onIqPacketReceived(final Account account, final IqPacket packet) {
665 final Element instructions = packet.query().findChild("instructions");
666 if (packet.query().hasChild("username")
667 && (packet.query().hasChild("password"))) {
668 final IqPacket register = new IqPacket(IqPacket.TYPE.SET);
669 final Element username = new Element("username").setContent(account.getUsername());
670 final Element password = new Element("password").setContent(account.getPassword());
671 register.query("jabber:iq:register").addChild(username);
672 register.query().addChild(password);
673 sendIqPacket(register, new OnIqPacketReceived() {
674
675 @Override
676 public void onIqPacketReceived(final Account account, final IqPacket packet) {
677 if (packet.getType() == IqPacket.TYPE.RESULT) {
678 account.setOption(Account.OPTION_REGISTER,
679 false);
680 changeStatus(Account.State.REGISTRATION_SUCCESSFUL);
681 } else if (packet.hasChild("error")
682 && (packet.findChild("error")
683 .hasChild("conflict"))) {
684 changeStatus(Account.State.REGISTRATION_CONFLICT);
685 } else {
686 changeStatus(Account.State.REGISTRATION_FAILED);
687 Log.d(Config.LOGTAG, packet.toString());
688 }
689 disconnect(true);
690 }
691 });
692 } else {
693 changeStatus(Account.State.REGISTRATION_FAILED);
694 disconnect(true);
695 Log.d(Config.LOGTAG, account.getJid().toBareJid()
696 + ": could not register. instructions are"
697 + (instructions != null ? instructions.getContent() : ""));
698 }
699 }
700 });
701 }
702
703 private void sendBindRequest() {
704 while(!mXmppConnectionService.areMessagesInitialized()) {
705 try {
706 Thread.sleep(500);
707 } catch (final InterruptedException ignored) {
708 }
709 }
710 clearIqCallbacks();
711 final IqPacket iq = new IqPacket(IqPacket.TYPE.SET);
712 iq.addChild("bind", "urn:ietf:params:xml:ns:xmpp-bind")
713 .addChild("resource").setContent(account.getResource());
714 this.sendUnmodifiedIqPacket(iq, new OnIqPacketReceived() {
715 @Override
716 public void onIqPacketReceived(final Account account, final IqPacket packet) {
717 final Element bind = packet.findChild("bind");
718 if (bind != null) {
719 final Element jid = bind.findChild("jid");
720 if (jid != null && jid.getContent() != null) {
721 try {
722 account.setResource(Jid.fromString(jid.getContent()).getResourcepart());
723 } catch (final InvalidJidException e) {
724 // TODO: Handle the case where an external JID is technically invalid?
725 }
726 if (streamFeatures.hasChild("session")) {
727 sendStartSession();
728 } else {
729 sendPostBindInitialization();
730 }
731 } else {
732 disconnect(true);
733 }
734 } else {
735 disconnect(true);
736 }
737 }
738 });
739 }
740
741 private void clearIqCallbacks() {
742 Log.d(Config.LOGTAG,account.getJid().toBareJid()+": clearing iq iq callbacks");
743 final IqPacket failurePacket = new IqPacket(IqPacket.TYPE.ERROR);
744 Iterator<Entry<String, Pair<IqPacket, OnIqPacketReceived>>> iterator = this.packetCallbacks.entrySet().iterator();
745 while(iterator.hasNext()) {
746 Entry<String, Pair<IqPacket, OnIqPacketReceived>> entry = iterator.next();
747 entry.getValue().second.onIqPacketReceived(account,failurePacket);
748 iterator.remove();
749 }
750 }
751
752 private void sendStartSession() {
753 final IqPacket startSession = new IqPacket(IqPacket.TYPE.SET);
754 startSession.addChild("session", "urn:ietf:params:xml:ns:xmpp-session");
755 this.sendUnmodifiedIqPacket(startSession, new OnIqPacketReceived() {
756 @Override
757 public void onIqPacketReceived(Account account, IqPacket packet) {
758 if (packet.getType() == IqPacket.TYPE.RESULT) {
759 sendPostBindInitialization();
760 } else {
761 disconnect(true);
762 }
763 }
764 });
765 }
766
767 private void sendPostBindInitialization() {
768 smVersion = 0;
769 if (streamFeatures.hasChild("sm", "urn:xmpp:sm:3")) {
770 smVersion = 3;
771 } else if (streamFeatures.hasChild("sm", "urn:xmpp:sm:2")) {
772 smVersion = 2;
773 }
774 if (smVersion != 0) {
775 final EnablePacket enable = new EnablePacket(smVersion);
776 tagWriter.writeStanzaAsync(enable);
777 stanzasSent = 0;
778 mStanzaReceipts.clear();
779 }
780 features.carbonsEnabled = false;
781 features.blockListRequested = false;
782 disco.clear();
783 sendServiceDiscoveryInfo(account.getServer());
784 sendServiceDiscoveryInfo(account.getJid().toBareJid());
785 sendServiceDiscoveryItems(account.getServer());
786 if (bindListener != null) {
787 bindListener.onBind(account);
788 }
789 sendInitialPing();
790 }
791
792 private void sendServiceDiscoveryInfo(final Jid jid) {
793 if (disco.containsKey(jid)) {
794 if (account.getServer().equals(jid)) {
795 enableAdvancedStreamFeatures();
796 }
797 } else {
798 final IqPacket iq = new IqPacket(IqPacket.TYPE.GET);
799 iq.setTo(jid);
800 iq.query("http://jabber.org/protocol/disco#info");
801 this.sendIqPacket(iq, new OnIqPacketReceived() {
802
803 @Override
804 public void onIqPacketReceived(final Account account, final IqPacket packet) {
805 final List<Element> elements = packet.query().getChildren();
806 final Info info = new Info();
807 for (final Element element : elements) {
808 if (element.getName().equals("identity")) {
809 String type = element.getAttribute("type");
810 String category = element.getAttribute("category");
811 if (type != null && category != null) {
812 info.identities.add(new Pair<>(category,type));
813 }
814 } else if (element.getName().equals("feature")) {
815 info.features.add(element.getAttribute("var"));
816 }
817 }
818 disco.put(jid, info);
819
820 if (account.getServer().equals(jid)) {
821 enableAdvancedStreamFeatures();
822 for (final OnAdvancedStreamFeaturesLoaded listener : advancedStreamFeaturesLoadedListeners) {
823 listener.onAdvancedStreamFeaturesAvailable(account);
824 }
825 }
826 }
827 });
828 }
829 }
830
831 private void enableAdvancedStreamFeatures() {
832 if (getFeatures().carbons() && !features.carbonsEnabled) {
833 sendEnableCarbons();
834 }
835 if (getFeatures().blocking() && !features.blockListRequested) {
836 Log.d(Config.LOGTAG,account.getJid().toBareJid()+": Requesting block list");
837 this.sendIqPacket(getIqGenerator().generateGetBlockList(), mXmppConnectionService.getIqParser());
838 }
839 }
840
841 private void sendServiceDiscoveryItems(final Jid server) {
842 final IqPacket iq = new IqPacket(IqPacket.TYPE.GET);
843 iq.setTo(server.toDomainJid());
844 iq.query("http://jabber.org/protocol/disco#items");
845 this.sendIqPacket(iq, new OnIqPacketReceived() {
846
847 @Override
848 public void onIqPacketReceived(final Account account, final IqPacket packet) {
849 final List<Element> elements = packet.query().getChildren();
850 for (final Element element : elements) {
851 if (element.getName().equals("item")) {
852 final Jid jid = element.getAttributeAsJid("jid");
853 if (jid != null && !jid.equals(account.getServer())) {
854 sendServiceDiscoveryInfo(jid);
855 }
856 }
857 }
858 }
859 });
860 }
861
862 private void sendEnableCarbons() {
863 final IqPacket iq = new IqPacket(IqPacket.TYPE.SET);
864 iq.addChild("enable", "urn:xmpp:carbons:2");
865 this.sendIqPacket(iq, new OnIqPacketReceived() {
866
867 @Override
868 public void onIqPacketReceived(final Account account, final IqPacket packet) {
869 if (!packet.hasChild("error")) {
870 Log.d(Config.LOGTAG, account.getJid().toBareJid()
871 + ": successfully enabled carbons");
872 features.carbonsEnabled = true;
873 } else {
874 Log.d(Config.LOGTAG, account.getJid().toBareJid()
875 + ": error enableing carbons " + packet.toString());
876 }
877 }
878 });
879 }
880
881 private void processStreamError(final Tag currentTag)
882 throws XmlPullParserException, IOException {
883 final Element streamError = tagReader.readElement(currentTag);
884 if (streamError != null && streamError.hasChild("conflict")) {
885 final String resource = account.getResource().split("\\.")[0];
886 account.setResource(resource + "." + nextRandomId());
887 Log.d(Config.LOGTAG,
888 account.getJid().toBareJid() + ": switching resource due to conflict ("
889 + account.getResource() + ")");
890 }
891 }
892
893 private void sendStartStream() throws IOException {
894 final Tag stream = Tag.start("stream:stream");
895 stream.setAttribute("from", account.getJid().toBareJid().toString());
896 stream.setAttribute("to", account.getServer().toString());
897 stream.setAttribute("version", "1.0");
898 stream.setAttribute("xml:lang", "en");
899 stream.setAttribute("xmlns", "jabber:client");
900 stream.setAttribute("xmlns:stream", "http://etherx.jabber.org/streams");
901 tagWriter.writeTag(stream);
902 }
903
904 private String nextRandomId() {
905 return new BigInteger(50, mXmppConnectionService.getRNG()).toString(32);
906 }
907
908 public void sendIqPacket(final IqPacket packet, final OnIqPacketReceived callback) {
909 packet.setFrom(account.getJid());
910 this.sendUnmodifiedIqPacket(packet, callback);
911
912 }
913
914 private synchronized void sendUnmodifiedIqPacket(final IqPacket packet, final OnIqPacketReceived callback) {
915 if (packet.getId() == null) {
916 final String id = nextRandomId();
917 packet.setAttribute("id", id);
918 }
919 if (callback != null) {
920 packetCallbacks.put(packet.getId(), new Pair<>(packet, callback));
921 }
922 this.sendPacket(packet);
923 }
924
925 public void sendMessagePacket(final MessagePacket packet) {
926 this.sendPacket(packet);
927 }
928
929 public void sendPresencePacket(final PresencePacket packet) {
930 this.sendPacket(packet);
931 }
932
933 private synchronized void sendPacket(final AbstractStanza packet) {
934 if (stanzasSent == Integer.MAX_VALUE) {
935 resetStreamId();
936 disconnect(true);
937 return;
938 }
939 final String name = packet.getName();
940 if (name.equals("iq") || name.equals("message") || name.equals("presence")) {
941 ++stanzasSent;
942 }
943 tagWriter.writeStanzaAsync(packet);
944 if ((packet instanceof MessagePacket || packet instanceof IqPacket) && packet.getId() != null && this.streamId != null) {
945 if (Config.EXTENDED_SM_LOGGING) {
946 Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": requesting ack for stanza #" + stanzasSent);
947 }
948 this.mStanzaReceipts.put(stanzasSent, packet.getId());
949 tagWriter.writeStanzaAsync(new RequestPacket(this.smVersion));
950 }
951 }
952
953 public void sendPing() {
954 if (streamFeatures.hasChild("sm")) {
955 tagWriter.writeStanzaAsync(new RequestPacket(smVersion));
956 } else {
957 final IqPacket iq = new IqPacket(IqPacket.TYPE.GET);
958 iq.setFrom(account.getJid());
959 iq.addChild("ping", "urn:xmpp:ping");
960 this.sendIqPacket(iq, null);
961 }
962 this.lastPingSent = SystemClock.elapsedRealtime();
963 }
964
965 public void setOnMessagePacketReceivedListener(
966 final OnMessagePacketReceived listener) {
967 this.messageListener = listener;
968 }
969
970 public void setOnUnregisteredIqPacketReceivedListener(
971 final OnIqPacketReceived listener) {
972 this.unregisteredIqListener = listener;
973 }
974
975 public void setOnPresencePacketReceivedListener(
976 final OnPresencePacketReceived listener) {
977 this.presenceListener = listener;
978 }
979
980 public void setOnJinglePacketReceivedListener(
981 final OnJinglePacketReceived listener) {
982 this.jingleListener = listener;
983 }
984
985 public void setOnStatusChangedListener(final OnStatusChanged listener) {
986 this.statusListener = listener;
987 }
988
989 public void setOnBindListener(final OnBindListener listener) {
990 this.bindListener = listener;
991 }
992
993 public void setOnMessageAcknowledgeListener(final OnMessageAcknowledged listener) {
994 this.acknowledgedListener = listener;
995 }
996
997 public void addOnAdvancedStreamFeaturesAvailableListener(final OnAdvancedStreamFeaturesLoaded listener) {
998 if (!this.advancedStreamFeaturesLoadedListeners.contains(listener)) {
999 this.advancedStreamFeaturesLoadedListeners.add(listener);
1000 }
1001 }
1002
1003 public void disconnect(final boolean force) {
1004 Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": disconnecting");
1005 try {
1006 if (force) {
1007 socket.close();
1008 return;
1009 }
1010 new Thread(new Runnable() {
1011
1012 @Override
1013 public void run() {
1014 if (tagWriter.isActive()) {
1015 tagWriter.finish();
1016 try {
1017 while (!tagWriter.finished() && socket.isConnected()) {
1018 Log.d(Config.LOGTAG, "not yet finished");
1019 Thread.sleep(100);
1020 }
1021 tagWriter.writeTag(Tag.end("stream:stream"));
1022 socket.close();
1023 } catch (final IOException e) {
1024 Log.d(Config.LOGTAG,
1025 "io exception during disconnect");
1026 } catch (final InterruptedException e) {
1027 Log.d(Config.LOGTAG, "interrupted");
1028 }
1029 }
1030 }
1031 }).start();
1032 } catch (final IOException e) {
1033 Log.d(Config.LOGTAG, "io exception during disconnect");
1034 }
1035 }
1036
1037 public void resetStreamId() {
1038 this.streamId = null;
1039 }
1040
1041 public List<Jid> findDiscoItemsByFeature(final String feature) {
1042 final List<Jid> items = new ArrayList<>();
1043 for (final Entry<Jid, Info> cursor : disco.entrySet()) {
1044 if (cursor.getValue().features.contains(feature)) {
1045 items.add(cursor.getKey());
1046 }
1047 }
1048 return items;
1049 }
1050
1051 public Jid findDiscoItemByFeature(final String feature) {
1052 final List<Jid> items = findDiscoItemsByFeature(feature);
1053 if (items.size() >= 1) {
1054 return items.get(0);
1055 }
1056 return null;
1057 }
1058
1059 public void r() {
1060 this.tagWriter.writeStanzaAsync(new RequestPacket(smVersion));
1061 }
1062
1063 public String getMucServer() {
1064 for (final Entry<Jid, Info> cursor : disco.entrySet()) {
1065 final Info value = cursor.getValue();
1066 if (value.features.contains("http://jabber.org/protocol/muc")
1067 && !value.features.contains("jabber:iq:gateway")
1068 && !value.identities.contains(new Pair<>("conference","irc"))) {
1069 return cursor.getKey().toString();
1070 }
1071 }
1072 return null;
1073 }
1074
1075 public int getTimeToNextAttempt() {
1076 final int interval = (int) (25 * Math.pow(1.5, attempt));
1077 final int secondsSinceLast = (int) ((SystemClock.elapsedRealtime() - this.lastConnect) / 1000);
1078 return interval - secondsSinceLast;
1079 }
1080
1081 public int getAttempt() {
1082 return this.attempt;
1083 }
1084
1085 public Features getFeatures() {
1086 return this.features;
1087 }
1088
1089 public long getLastSessionEstablished() {
1090 final long diff;
1091 if (this.lastSessionStarted == 0) {
1092 diff = SystemClock.elapsedRealtime() - this.lastConnect;
1093 } else {
1094 diff = SystemClock.elapsedRealtime() - this.lastSessionStarted;
1095 }
1096 return System.currentTimeMillis() - diff;
1097 }
1098
1099 public long getLastConnect() {
1100 return this.lastConnect;
1101 }
1102
1103 public long getLastPingSent() {
1104 return this.lastPingSent;
1105 }
1106
1107 public long getLastPacketReceived() {
1108 return this.lastPacketReceived;
1109 }
1110
1111 public void sendActive() {
1112 this.sendPacket(new ActivePacket());
1113 }
1114
1115 public void sendInactive() {
1116 this.sendPacket(new InactivePacket());
1117 }
1118
1119 public void resetAttemptCount() {
1120 this.attempt = 0;
1121 this.lastConnect = 0;
1122 }
1123
1124 private class Info {
1125 public final ArrayList<String> features = new ArrayList<>();
1126 public final ArrayList<Pair<String,String>> identities = new ArrayList<>();
1127 }
1128
1129 private class UnauthorizedException extends IOException {
1130
1131 }
1132
1133 private class SecurityException extends IOException {
1134
1135 }
1136
1137 private class IncompatibleServerException extends IOException {
1138
1139 }
1140
1141 public class Features {
1142 XmppConnection connection;
1143 private boolean carbonsEnabled = false;
1144 private boolean encryptionEnabled = false;
1145 private boolean blockListRequested = false;
1146
1147 public Features(final XmppConnection connection) {
1148 this.connection = connection;
1149 }
1150
1151 private boolean hasDiscoFeature(final Jid server, final String feature) {
1152 return connection.disco.containsKey(server) &&
1153 connection.disco.get(server).features.contains(feature);
1154 }
1155
1156 public boolean carbons() {
1157 return hasDiscoFeature(account.getServer(), "urn:xmpp:carbons:2");
1158 }
1159
1160 public boolean blocking() {
1161 return hasDiscoFeature(account.getServer(), Xmlns.BLOCKING);
1162 }
1163
1164 public boolean register() {
1165 return hasDiscoFeature(account.getServer(), Xmlns.REGISTER);
1166 }
1167
1168 public boolean sm() {
1169 return streamId != null
1170 || (connection.streamFeatures != null && connection.streamFeatures.hasChild("sm"));
1171 }
1172
1173 public boolean csi() {
1174 return connection.streamFeatures != null && connection.streamFeatures.hasChild("csi", "urn:xmpp:csi:0");
1175 }
1176
1177 public boolean pep() {
1178 final Pair<String,String> needle = new Pair<>("pubsub","pep");
1179 Info info = disco.get(account.getServer());
1180 if (info != null && info.identities.contains(needle)) {
1181 return true;
1182 } else {
1183 info = disco.get(account.getJid().toBareJid());
1184 return info != null && info.identities.contains(needle);
1185 }
1186 }
1187
1188 public boolean mam() {
1189 if (hasDiscoFeature(account.getJid().toBareJid(), "urn:xmpp:mam:0")) {
1190 return true;
1191 } else {
1192 return hasDiscoFeature(account.getServer(), "urn:xmpp:mam:0");
1193 }
1194 }
1195
1196 public boolean advancedStreamFeaturesLoaded() {
1197 return disco.containsKey(account.getServer());
1198 }
1199
1200 public boolean rosterVersioning() {
1201 return connection.streamFeatures != null && connection.streamFeatures.hasChild("ver");
1202 }
1203
1204 public void setBlockListRequested(boolean value) {
1205 this.blockListRequested = value;
1206 }
1207
1208 public boolean httpUpload() {
1209 return findDiscoItemsByFeature(Xmlns.HTTP_UPLOAD).size() > 0;
1210 }
1211 }
1212
1213 private IqGenerator getIqGenerator() {
1214 return mXmppConnectionService.getIqGenerator();
1215 }
1216}