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 this.changeStatus(Account.State.CONNECTING);
156 if (DNSHelper.isIp(account.getServer().toString())) {
157 socket = new Socket();
158 try {
159 socket.connect(new InetSocketAddress(account.getServer().toString(), 5222), Config.SOCKET_TIMEOUT * 1000);
160 } catch (IOException e) {
161 throw new UnknownHostException();
162 }
163 } else {
164 final Bundle result = DNSHelper.getSRVRecord(account.getServer());
165 if (result == null) {
166 throw new IOException("unhandled exception in DNS resolver");
167 }
168 final ArrayList<Parcelable> values = result.getParcelableArrayList("values");
169 if ("timeout".equals(result.getString("error"))) {
170 throw new IOException("timeout in dns");
171 } else if (values != null) {
172 int i = 0;
173 boolean socketError = true;
174 while (socketError && values.size() > i) {
175 final Bundle namePort = (Bundle) values.get(i);
176 try {
177 String srvRecordServer;
178 try {
179 srvRecordServer = IDN.toASCII(namePort.getString("name"));
180 } catch (final IllegalArgumentException e) {
181 // TODO: Handle me?`
182 srvRecordServer = "";
183 }
184 final int srvRecordPort = namePort.getInt("port");
185 final String srvIpServer = namePort.getString("ip");
186 final InetSocketAddress addr;
187 if (srvIpServer != null) {
188 addr = new InetSocketAddress(srvIpServer, srvRecordPort);
189 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
190 + ": using values from dns " + srvRecordServer
191 + "[" + srvIpServer + "]:" + srvRecordPort);
192 } else {
193 addr = new InetSocketAddress(srvRecordServer, srvRecordPort);
194 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
195 + ": using values from dns "
196 + srvRecordServer + ":" + srvRecordPort);
197 }
198 socket = new Socket();
199 socket.connect(addr, Config.SOCKET_TIMEOUT * 1000);
200 socketError = false;
201 } catch (final Throwable e) {
202 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": " + e.getMessage());
203 i++;
204 }
205 }
206 if (socketError) {
207 throw new UnknownHostException();
208 }
209 } else {
210 throw new IOException("unhandled exception in DNS resolver");
211 }
212 }
213 final OutputStream out = socket.getOutputStream();
214 tagWriter.setOutputStream(out);
215 final InputStream in = socket.getInputStream();
216 tagReader.setInputStream(in);
217 tagWriter.beginDocument();
218 sendStartStream();
219 Tag nextTag;
220 while ((nextTag = tagReader.readTag()) != null) {
221 if (nextTag.isStart("stream")) {
222 processStream(nextTag);
223 break;
224 } else {
225 throw new IOException("unknown tag on connect");
226 }
227 }
228 if (socket.isConnected()) {
229 socket.close();
230 }
231 } catch (final IncompatibleServerException e) {
232 this.changeStatus(Account.State.INCOMPATIBLE_SERVER);
233 } catch (final SecurityException e) {
234 this.changeStatus(Account.State.SECURITY_ERROR);
235 } catch (final UnauthorizedException e) {
236 this.changeStatus(Account.State.UNAUTHORIZED);
237 } catch (final UnknownHostException | ConnectException e) {
238 this.changeStatus(Account.State.SERVER_NOT_FOUND);
239 } catch (final IOException | XmlPullParserException | NoSuchAlgorithmException e) {
240 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": " + e.getMessage());
241 this.changeStatus(Account.State.OFFLINE);
242 this.attempt--; //don't count attempt when reconnecting instantly anyway
243 } finally {
244 if (socket != null) {
245 try {
246 socket.close();
247 } catch (IOException e) {
248
249 }
250 }
251 if (wakeLock.isHeld()) {
252 try {
253 wakeLock.release();
254 } catch (final RuntimeException ignored) {
255 }
256 }
257 }
258 }
259
260 @Override
261 public void run() {
262 try {
263 if (socket != null) {
264 socket.close();
265 }
266 } catch (final IOException ignored) {
267
268 }
269 connect();
270 }
271
272 private void processStream(final Tag currentTag) throws XmlPullParserException,
273 IOException, NoSuchAlgorithmException {
274 Tag nextTag = tagReader.readTag();
275
276 while ((nextTag != null) && (!nextTag.isEnd("stream"))) {
277 if (nextTag.isStart("error")) {
278 processStreamError(nextTag);
279 } else if (nextTag.isStart("features")) {
280 processStreamFeatures(nextTag);
281 } else if (nextTag.isStart("proceed")) {
282 switchOverToTls(nextTag);
283 } else if (nextTag.isStart("success")) {
284 final String challenge = tagReader.readElement(nextTag).getContent();
285 try {
286 saslMechanism.getResponse(challenge);
287 } catch (final SaslMechanism.AuthenticationException e) {
288 disconnect(true);
289 Log.e(Config.LOGTAG, String.valueOf(e));
290 }
291 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": logged in");
292 account.setKey(Account.PINNED_MECHANISM_KEY,
293 String.valueOf(saslMechanism.getPriority()));
294 tagReader.reset();
295 sendStartStream();
296 processStream(tagReader.readTag());
297 break;
298 } else if (nextTag.isStart("failure")) {
299 throw new UnauthorizedException();
300 } else if (nextTag.isStart("challenge")) {
301 final String challenge = tagReader.readElement(nextTag).getContent();
302 final Element response = new Element("response");
303 response.setAttribute("xmlns",
304 "urn:ietf:params:xml:ns:xmpp-sasl");
305 try {
306 response.setContent(saslMechanism.getResponse(challenge));
307 } catch (final SaslMechanism.AuthenticationException e) {
308 // TODO: Send auth abort tag.
309 Log.e(Config.LOGTAG, e.toString());
310 }
311 tagWriter.writeElement(response);
312 } else if (nextTag.isStart("enabled")) {
313 final Element enabled = tagReader.readElement(nextTag);
314 if ("true".equals(enabled.getAttribute("resume"))) {
315 this.streamId = enabled.getAttribute("id");
316 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
317 + ": stream managment(" + smVersion
318 + ") enabled (resumable)");
319 } else {
320 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
321 + ": stream managment(" + smVersion + ") enabled");
322 }
323 this.lastSessionStarted = SystemClock.elapsedRealtime();
324 this.stanzasReceived = 0;
325 final RequestPacket r = new RequestPacket(smVersion);
326 tagWriter.writeStanzaAsync(r);
327 } else if (nextTag.isStart("resumed")) {
328 lastPacketReceived = SystemClock.elapsedRealtime();
329 final Element resumed = tagReader.readElement(nextTag);
330 final String h = resumed.getAttribute("h");
331 try {
332 final int serverCount = Integer.parseInt(h);
333 if (serverCount != stanzasSent) {
334 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
335 + ": session resumed with lost packages");
336 stanzasSent = serverCount;
337 } else {
338 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": session resumed");
339 }
340 acknowledgeStanzaUpTo(serverCount);
341 ArrayList<IqPacket> failedIqPackets = new ArrayList<>();
342 for(int i = 0; i < this.mStanzaReceipts.size(); ++i) {
343 String id = mStanzaReceipts.valueAt(i);
344 Pair<IqPacket,OnIqPacketReceived> pair = id == null ? null : this.packetCallbacks.get(id);
345 if (pair != null) {
346 failedIqPackets.add(pair.first);
347 }
348 }
349 mStanzaReceipts.clear();
350 Log.d(Config.LOGTAG,"resending "+failedIqPackets.size()+" iq stanza");
351 for(IqPacket packet : failedIqPackets) {
352 sendUnmodifiedIqPacket(packet,null);
353 }
354 } catch (final NumberFormatException ignored) {
355 }
356 sendInitialPing();
357 } else if (nextTag.isStart("r")) {
358 tagReader.readElement(nextTag);
359 if (Config.EXTENDED_SM_LOGGING) {
360 Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": acknowledging stanza #" + this.stanzasReceived);
361 }
362 final AckPacket ack = new AckPacket(this.stanzasReceived, smVersion);
363 tagWriter.writeStanzaAsync(ack);
364 } else if (nextTag.isStart("a")) {
365 final Element ack = tagReader.readElement(nextTag);
366 lastPacketReceived = SystemClock.elapsedRealtime();
367 try {
368 final int serverSequence = Integer.parseInt(ack.getAttribute("h"));
369 acknowledgeStanzaUpTo(serverSequence);
370 } catch (NumberFormatException e) {
371 Log.d(Config.LOGTAG,account.getJid().toBareJid()+": server send ack without sequence number");
372 }
373 } else if (nextTag.isStart("failed")) {
374 tagReader.readElement(nextTag);
375 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": resumption failed");
376 streamId = null;
377 if (account.getStatus() != Account.State.ONLINE) {
378 sendBindRequest();
379 }
380 } else if (nextTag.isStart("iq")) {
381 processIq(nextTag);
382 } else if (nextTag.isStart("message")) {
383 processMessage(nextTag);
384 } else if (nextTag.isStart("presence")) {
385 processPresence(nextTag);
386 }
387 nextTag = tagReader.readTag();
388 }
389 if (account.getStatus() == Account.State.ONLINE) {
390 account. setStatus(Account.State.OFFLINE);
391 if (statusListener != null) {
392 statusListener.onStatusChanged(account);
393 }
394 }
395 }
396
397 private void acknowledgeStanzaUpTo(int serverCount) {
398 for (int i = 0; i < mStanzaReceipts.size(); ++i) {
399 if (serverCount >= mStanzaReceipts.keyAt(i)) {
400 if (Config.EXTENDED_SM_LOGGING) {
401 Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": server acknowledged stanza #" + mStanzaReceipts.keyAt(i));
402 }
403 String id = mStanzaReceipts.valueAt(i);
404 if (acknowledgedListener != null) {
405 acknowledgedListener.onMessageAcknowledged(account, id);
406 }
407 mStanzaReceipts.removeAt(i);
408 i--;
409 }
410 }
411 }
412
413 private void sendInitialPing() {
414 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": sending intial ping");
415 final IqPacket iq = new IqPacket(IqPacket.TYPE.GET);
416 iq.setFrom(account.getJid());
417 iq.addChild("ping", "urn:xmpp:ping");
418 this.sendIqPacket(iq, new OnIqPacketReceived() {
419 @Override
420 public void onIqPacketReceived(final Account account, final IqPacket packet) {
421 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
422 + ": online with resource " + account.getResource());
423 changeStatus(Account.State.ONLINE);
424 }
425 });
426 }
427
428 private Element processPacket(final Tag currentTag, final int packetType)
429 throws XmlPullParserException, IOException {
430 Element element;
431 switch (packetType) {
432 case PACKET_IQ:
433 element = new IqPacket();
434 break;
435 case PACKET_MESSAGE:
436 element = new MessagePacket();
437 break;
438 case PACKET_PRESENCE:
439 element = new PresencePacket();
440 break;
441 default:
442 return null;
443 }
444 element.setAttributes(currentTag.getAttributes());
445 Tag nextTag = tagReader.readTag();
446 if (nextTag == null) {
447 throw new IOException("interrupted mid tag");
448 }
449 while (!nextTag.isEnd(element.getName())) {
450 if (!nextTag.isNo()) {
451 final Element child = tagReader.readElement(nextTag);
452 final String type = currentTag.getAttribute("type");
453 if (packetType == PACKET_IQ
454 && "jingle".equals(child.getName())
455 && ("set".equalsIgnoreCase(type) || "get"
456 .equalsIgnoreCase(type))) {
457 element = new JinglePacket();
458 element.setAttributes(currentTag.getAttributes());
459 }
460 element.addChild(child);
461 }
462 nextTag = tagReader.readTag();
463 if (nextTag == null) {
464 throw new IOException("interrupted mid tag");
465 }
466 }
467 if (stanzasReceived == Integer.MAX_VALUE) {
468 resetStreamId();
469 throw new IOException("time to restart the session. cant handle >2 billion pcks");
470 }
471 ++stanzasReceived;
472 lastPacketReceived = SystemClock.elapsedRealtime();
473 return element;
474 }
475
476 private void processIq(final Tag currentTag) throws XmlPullParserException, IOException {
477 final IqPacket packet = (IqPacket) processPacket(currentTag, PACKET_IQ);
478
479 if (packet.getId() == null) {
480 return; // an iq packet without id is definitely invalid
481 }
482
483 if (packet instanceof JinglePacket) {
484 if (this.jingleListener != null) {
485 this.jingleListener.onJinglePacketReceived(account,(JinglePacket) packet);
486 }
487 } else {
488 synchronized (this.packetCallbacks) {
489 if (packetCallbacks.containsKey(packet.getId())) {
490 final Pair<IqPacket, OnIqPacketReceived> packetCallbackDuple = packetCallbacks.get(packet.getId());
491 // Packets to the server should have responses from the server
492 if (packetCallbackDuple.first.toServer(account)) {
493 if (packet.fromServer(account)) {
494 packetCallbackDuple.second.onIqPacketReceived(account, packet);
495 packetCallbacks.remove(packet.getId());
496 } else {
497 Log.e(Config.LOGTAG, account.getJid().toBareJid().toString() + ": ignoring spoofed iq packet");
498 }
499 } else {
500 if (packet.getFrom().equals(packetCallbackDuple.first.getTo())) {
501 packetCallbackDuple.second.onIqPacketReceived(account, packet);
502 packetCallbacks.remove(packet.getId());
503 } else {
504 Log.e(Config.LOGTAG, account.getJid().toBareJid().toString() + ": ignoring spoofed iq packet");
505 }
506 }
507 } else if (packet.getType() == IqPacket.TYPE.GET || packet.getType() == IqPacket.TYPE.SET) {
508 this.unregisteredIqListener.onIqPacketReceived(account, packet);
509 }
510 }
511 }
512 }
513
514 private void processMessage(final Tag currentTag) throws XmlPullParserException, IOException {
515 final MessagePacket packet = (MessagePacket) processPacket(currentTag,PACKET_MESSAGE);
516 this.messageListener.onMessagePacketReceived(account, packet);
517 }
518
519 private void processPresence(final Tag currentTag) throws XmlPullParserException, IOException {
520 PresencePacket packet = (PresencePacket) processPacket(currentTag, PACKET_PRESENCE);
521 this.presenceListener.onPresencePacketReceived(account, packet);
522 }
523
524 private void sendStartTLS() throws IOException {
525 final Tag startTLS = Tag.empty("starttls");
526 startTLS.setAttribute("xmlns", "urn:ietf:params:xml:ns:xmpp-tls");
527 tagWriter.writeTag(startTLS);
528 }
529
530 private void switchOverToTls(final Tag currentTag) throws XmlPullParserException, IOException {
531 tagReader.readTag();
532 try {
533 final SSLContext sc = SSLContext.getInstance("TLS");
534 sc.init(null,new X509TrustManager[]{this.mXmppConnectionService.getMemorizingTrustManager()},mXmppConnectionService.getRNG());
535 final SSLSocketFactory factory = sc.getSocketFactory();
536 final HostnameVerifier verifier = this.mXmppConnectionService.getMemorizingTrustManager().wrapHostnameVerifier(new StrictHostnameVerifier());
537 final InetAddress address = socket == null ? null : socket.getInetAddress();
538
539 if (factory == null || address == null || verifier == null) {
540 throw new IOException("could not setup ssl");
541 }
542
543 final SSLSocket sslSocket = (SSLSocket) factory.createSocket(socket,address.getHostAddress(), socket.getPort(),true);
544
545 if (sslSocket == null) {
546 throw new IOException("could not initialize ssl socket");
547 }
548
549 final String[] supportProtocols;
550 final Collection<String> supportedProtocols = new LinkedList<>(
551 Arrays.asList(sslSocket.getSupportedProtocols()));
552 supportedProtocols.remove("SSLv3");
553 supportProtocols = supportedProtocols.toArray(new String[supportedProtocols.size()]);
554
555 sslSocket.setEnabledProtocols(supportProtocols);
556
557 final String[] cipherSuites = CryptoHelper.getOrderedCipherSuites(
558 sslSocket.getSupportedCipherSuites());
559 //Log.d(Config.LOGTAG, "Using ciphers: " + Arrays.toString(cipherSuites));
560 if (cipherSuites.length > 0) {
561 sslSocket.setEnabledCipherSuites(cipherSuites);
562 }
563
564 if (!verifier.verify(account.getServer().getDomainpart(),sslSocket.getSession())) {
565 Log.d(Config.LOGTAG,account.getJid().toBareJid()+": TLS certificate verification failed");
566 throw new SecurityException();
567 }
568 tagReader.setInputStream(sslSocket.getInputStream());
569 tagWriter.setOutputStream(sslSocket.getOutputStream());
570 sendStartStream();
571 Log.d(Config.LOGTAG, account.getJid().toBareJid()+ ": TLS connection established");
572 features.encryptionEnabled = true;
573 processStream(tagReader.readTag());
574 sslSocket.close();
575 } catch (final NoSuchAlgorithmException | KeyManagementException e1) {
576 Log.d(Config.LOGTAG,account.getJid().toBareJid()+": TLS certificate verification failed");
577 throw new SecurityException();
578 }
579 }
580
581 private void processStreamFeatures(final Tag currentTag)
582 throws XmlPullParserException, IOException {
583 this.streamFeatures = tagReader.readElement(currentTag);
584 if (this.streamFeatures.hasChild("starttls") && !features.encryptionEnabled) {
585 sendStartTLS();
586 } else if (this.streamFeatures.hasChild("register")
587 && account.isOptionSet(Account.OPTION_REGISTER)
588 && features.encryptionEnabled) {
589 sendRegistryRequest();
590 } else if (!this.streamFeatures.hasChild("register")
591 && account.isOptionSet(Account.OPTION_REGISTER)) {
592 changeStatus(Account.State.REGISTRATION_NOT_SUPPORTED);
593 disconnect(true);
594 } else if (this.streamFeatures.hasChild("mechanisms")
595 && shouldAuthenticate && features.encryptionEnabled) {
596 final List<String> mechanisms = extractMechanisms(streamFeatures
597 .findChild("mechanisms"));
598 final Element auth = new Element("auth");
599 auth.setAttribute("xmlns", "urn:ietf:params:xml:ns:xmpp-sasl");
600 if (mechanisms.contains("SCRAM-SHA-1")) {
601 saslMechanism = new ScramSha1(tagWriter, account, mXmppConnectionService.getRNG());
602 } else if (mechanisms.contains("PLAIN")) {
603 saslMechanism = new Plain(tagWriter, account);
604 } else if (mechanisms.contains("DIGEST-MD5")) {
605 saslMechanism = new DigestMd5(tagWriter, account, mXmppConnectionService.getRNG());
606 }
607 if (saslMechanism != null) {
608 final JSONObject keys = account.getKeys();
609 try {
610 if (keys.has(Account.PINNED_MECHANISM_KEY) &&
611 keys.getInt(Account.PINNED_MECHANISM_KEY) > saslMechanism.getPriority()) {
612 Log.e(Config.LOGTAG, "Auth failed. Authentication mechanism " + saslMechanism.getMechanism() +
613 " has lower priority (" + String.valueOf(saslMechanism.getPriority()) +
614 ") than pinned priority (" + keys.getInt(Account.PINNED_MECHANISM_KEY) +
615 "). Possible downgrade attack?");
616 throw new SecurityException();
617 }
618 } catch (final JSONException e) {
619 Log.d(Config.LOGTAG, "Parse error while checking pinned auth mechanism");
620 }
621 Log.d(Config.LOGTAG, account.getJid().toString() + ": Authenticating with " + saslMechanism.getMechanism());
622 auth.setAttribute("mechanism", saslMechanism.getMechanism());
623 if (!saslMechanism.getClientFirstMessage().isEmpty()) {
624 auth.setContent(saslMechanism.getClientFirstMessage());
625 }
626 tagWriter.writeElement(auth);
627 } else {
628 throw new IncompatibleServerException();
629 }
630 } else if (this.streamFeatures.hasChild("sm", "urn:xmpp:sm:"
631 + smVersion)
632 && streamId != null) {
633 if (Config.EXTENDED_SM_LOGGING) {
634 Log.d(Config.LOGTAG,account.getJid().toBareJid()+": resuming after stanza #"+stanzasReceived);
635 }
636 final ResumePacket resume = new ResumePacket(this.streamId, stanzasReceived, smVersion);
637 this.tagWriter.writeStanzaAsync(resume);
638 } else if (this.streamFeatures.hasChild("bind") && shouldBind) {
639 sendBindRequest();
640 } else {
641 disconnect(true);
642 changeStatus(Account.State.INCOMPATIBLE_SERVER);
643 }
644 }
645
646 private List<String> extractMechanisms(final Element stream) {
647 final ArrayList<String> mechanisms = new ArrayList<>(stream
648 .getChildren().size());
649 for (final Element child : stream.getChildren()) {
650 mechanisms.add(child.getContent());
651 }
652 return mechanisms;
653 }
654
655 private void sendRegistryRequest() {
656 final IqPacket register = new IqPacket(IqPacket.TYPE.GET);
657 register.query("jabber:iq:register");
658 register.setTo(account.getServer());
659 sendIqPacket(register, new OnIqPacketReceived() {
660
661 @Override
662 public void onIqPacketReceived(final Account account, final IqPacket packet) {
663 final Element instructions = packet.query().findChild("instructions");
664 if (packet.query().hasChild("username")
665 && (packet.query().hasChild("password"))) {
666 final IqPacket register = new IqPacket(IqPacket.TYPE.SET);
667 final Element username = new Element("username").setContent(account.getUsername());
668 final Element password = new Element("password").setContent(account.getPassword());
669 register.query("jabber:iq:register").addChild(username);
670 register.query().addChild(password);
671 sendIqPacket(register, new OnIqPacketReceived() {
672
673 @Override
674 public void onIqPacketReceived(final Account account, final IqPacket packet) {
675 if (packet.getType() == IqPacket.TYPE.RESULT) {
676 account.setOption(Account.OPTION_REGISTER,
677 false);
678 changeStatus(Account.State.REGISTRATION_SUCCESSFUL);
679 } else if (packet.hasChild("error")
680 && (packet.findChild("error")
681 .hasChild("conflict"))) {
682 changeStatus(Account.State.REGISTRATION_CONFLICT);
683 } else {
684 changeStatus(Account.State.REGISTRATION_FAILED);
685 Log.d(Config.LOGTAG, packet.toString());
686 }
687 disconnect(true);
688 }
689 });
690 } else {
691 changeStatus(Account.State.REGISTRATION_FAILED);
692 disconnect(true);
693 Log.d(Config.LOGTAG, account.getJid().toBareJid()
694 + ": could not register. instructions are"
695 + (instructions != null ? instructions.getContent() : ""));
696 }
697 }
698 });
699 }
700
701 private void sendBindRequest() {
702 while(!mXmppConnectionService.areMessagesInitialized()) {
703 try {
704 Thread.sleep(500);
705 } catch (final InterruptedException ignored) {
706 }
707 }
708 clearIqCallbacks();
709 final IqPacket iq = new IqPacket(IqPacket.TYPE.SET);
710 iq.addChild("bind", "urn:ietf:params:xml:ns:xmpp-bind")
711 .addChild("resource").setContent(account.getResource());
712 this.sendUnmodifiedIqPacket(iq, new OnIqPacketReceived() {
713 @Override
714 public void onIqPacketReceived(final Account account, final IqPacket packet) {
715 final Element bind = packet.findChild("bind");
716 if (bind != null) {
717 final Element jid = bind.findChild("jid");
718 if (jid != null && jid.getContent() != null) {
719 try {
720 account.setResource(Jid.fromString(jid.getContent()).getResourcepart());
721 } catch (final InvalidJidException e) {
722 // TODO: Handle the case where an external JID is technically invalid?
723 }
724 if (streamFeatures.hasChild("session")) {
725 sendStartSession();
726 } else {
727 sendPostBindInitialization();
728 }
729 } else {
730 disconnect(true);
731 }
732 } else {
733 disconnect(true);
734 }
735 }
736 });
737 }
738
739 private void clearIqCallbacks() {
740 Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": clearing iq iq callbacks");
741 final IqPacket failurePacket = new IqPacket(IqPacket.TYPE.ERROR);
742 synchronized (this.packetCallbacks) {
743 Iterator<Entry<String, Pair<IqPacket, OnIqPacketReceived>>> iterator = this.packetCallbacks.entrySet().iterator();
744 while (iterator.hasNext()) {
745 Entry<String, Pair<IqPacket, OnIqPacketReceived>> entry = iterator.next();
746 entry.getValue().second.onIqPacketReceived(account, failurePacket);
747 iterator.remove();
748 }
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 synchronized (this.packetCallbacks) {
921 packetCallbacks.put(packet.getId(), new Pair<>(packet, callback));
922 }
923 }
924 this.sendPacket(packet);
925 }
926
927 public void sendMessagePacket(final MessagePacket packet) {
928 this.sendPacket(packet);
929 }
930
931 public void sendPresencePacket(final PresencePacket packet) {
932 this.sendPacket(packet);
933 }
934
935 private synchronized void sendPacket(final AbstractStanza packet) {
936 if (stanzasSent == Integer.MAX_VALUE) {
937 resetStreamId();
938 disconnect(true);
939 return;
940 }
941 final String name = packet.getName();
942 if (name.equals("iq") || name.equals("message") || name.equals("presence")) {
943 ++stanzasSent;
944 }
945 tagWriter.writeStanzaAsync(packet);
946 if ((packet instanceof MessagePacket || packet instanceof IqPacket) && packet.getId() != null && this.streamId != null) {
947 if (Config.EXTENDED_SM_LOGGING) {
948 Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": requesting ack for stanza #" + stanzasSent);
949 }
950 this.mStanzaReceipts.put(stanzasSent, packet.getId());
951 tagWriter.writeStanzaAsync(new RequestPacket(this.smVersion));
952 }
953 }
954
955 public void sendPing() {
956 if (streamFeatures.hasChild("sm")) {
957 tagWriter.writeStanzaAsync(new RequestPacket(smVersion));
958 } else {
959 final IqPacket iq = new IqPacket(IqPacket.TYPE.GET);
960 iq.setFrom(account.getJid());
961 iq.addChild("ping", "urn:xmpp:ping");
962 this.sendIqPacket(iq, null);
963 }
964 this.lastPingSent = SystemClock.elapsedRealtime();
965 }
966
967 public void setOnMessagePacketReceivedListener(
968 final OnMessagePacketReceived listener) {
969 this.messageListener = listener;
970 }
971
972 public void setOnUnregisteredIqPacketReceivedListener(
973 final OnIqPacketReceived listener) {
974 this.unregisteredIqListener = listener;
975 }
976
977 public void setOnPresencePacketReceivedListener(
978 final OnPresencePacketReceived listener) {
979 this.presenceListener = listener;
980 }
981
982 public void setOnJinglePacketReceivedListener(
983 final OnJinglePacketReceived listener) {
984 this.jingleListener = listener;
985 }
986
987 public void setOnStatusChangedListener(final OnStatusChanged listener) {
988 this.statusListener = listener;
989 }
990
991 public void setOnBindListener(final OnBindListener listener) {
992 this.bindListener = listener;
993 }
994
995 public void setOnMessageAcknowledgeListener(final OnMessageAcknowledged listener) {
996 this.acknowledgedListener = listener;
997 }
998
999 public void addOnAdvancedStreamFeaturesAvailableListener(final OnAdvancedStreamFeaturesLoaded listener) {
1000 if (!this.advancedStreamFeaturesLoadedListeners.contains(listener)) {
1001 this.advancedStreamFeaturesLoadedListeners.add(listener);
1002 }
1003 }
1004
1005 public void disconnect(final boolean force) {
1006 Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": disconnecting");
1007 try {
1008 if (force) {
1009 socket.close();
1010 return;
1011 }
1012 new Thread(new Runnable() {
1013
1014 @Override
1015 public void run() {
1016 if (tagWriter.isActive()) {
1017 tagWriter.finish();
1018 try {
1019 while (!tagWriter.finished() && socket.isConnected()) {
1020 Log.d(Config.LOGTAG, "not yet finished");
1021 Thread.sleep(100);
1022 }
1023 tagWriter.writeTag(Tag.end("stream:stream"));
1024 socket.close();
1025 } catch (final IOException e) {
1026 Log.d(Config.LOGTAG,
1027 "io exception during disconnect");
1028 } catch (final InterruptedException e) {
1029 Log.d(Config.LOGTAG, "interrupted");
1030 }
1031 }
1032 }
1033 }).start();
1034 } catch (final IOException e) {
1035 Log.d(Config.LOGTAG, "io exception during disconnect");
1036 }
1037 }
1038
1039 public void resetStreamId() {
1040 this.streamId = null;
1041 }
1042
1043 public List<Jid> findDiscoItemsByFeature(final String feature) {
1044 final List<Jid> items = new ArrayList<>();
1045 for (final Entry<Jid, Info> cursor : disco.entrySet()) {
1046 if (cursor.getValue().features.contains(feature)) {
1047 items.add(cursor.getKey());
1048 }
1049 }
1050 return items;
1051 }
1052
1053 public Jid findDiscoItemByFeature(final String feature) {
1054 final List<Jid> items = findDiscoItemsByFeature(feature);
1055 if (items.size() >= 1) {
1056 return items.get(0);
1057 }
1058 return null;
1059 }
1060
1061 public void r() {
1062 this.tagWriter.writeStanzaAsync(new RequestPacket(smVersion));
1063 }
1064
1065 public String getMucServer() {
1066 for (final Entry<Jid, Info> cursor : disco.entrySet()) {
1067 final Info value = cursor.getValue();
1068 if (value.features.contains("http://jabber.org/protocol/muc")
1069 && !value.features.contains("jabber:iq:gateway")
1070 && !value.identities.contains(new Pair<>("conference","irc"))) {
1071 return cursor.getKey().toString();
1072 }
1073 }
1074 return null;
1075 }
1076
1077 public int getTimeToNextAttempt() {
1078 final int interval = (int) (25 * Math.pow(1.5, attempt));
1079 final int secondsSinceLast = (int) ((SystemClock.elapsedRealtime() - this.lastConnect) / 1000);
1080 return interval - secondsSinceLast;
1081 }
1082
1083 public int getAttempt() {
1084 return this.attempt;
1085 }
1086
1087 public Features getFeatures() {
1088 return this.features;
1089 }
1090
1091 public long getLastSessionEstablished() {
1092 final long diff;
1093 if (this.lastSessionStarted == 0) {
1094 diff = SystemClock.elapsedRealtime() - this.lastConnect;
1095 } else {
1096 diff = SystemClock.elapsedRealtime() - this.lastSessionStarted;
1097 }
1098 return System.currentTimeMillis() - diff;
1099 }
1100
1101 public long getLastConnect() {
1102 return this.lastConnect;
1103 }
1104
1105 public long getLastPingSent() {
1106 return this.lastPingSent;
1107 }
1108
1109 public long getLastPacketReceived() {
1110 return this.lastPacketReceived;
1111 }
1112
1113 public void sendActive() {
1114 this.sendPacket(new ActivePacket());
1115 }
1116
1117 public void sendInactive() {
1118 this.sendPacket(new InactivePacket());
1119 }
1120
1121 public void resetAttemptCount() {
1122 this.attempt = 0;
1123 this.lastConnect = 0;
1124 }
1125
1126 private class Info {
1127 public final ArrayList<String> features = new ArrayList<>();
1128 public final ArrayList<Pair<String,String>> identities = new ArrayList<>();
1129 }
1130
1131 private class UnauthorizedException extends IOException {
1132
1133 }
1134
1135 private class SecurityException extends IOException {
1136
1137 }
1138
1139 private class IncompatibleServerException extends IOException {
1140
1141 }
1142
1143 public class Features {
1144 XmppConnection connection;
1145 private boolean carbonsEnabled = false;
1146 private boolean encryptionEnabled = false;
1147 private boolean blockListRequested = false;
1148
1149 public Features(final XmppConnection connection) {
1150 this.connection = connection;
1151 }
1152
1153 private boolean hasDiscoFeature(final Jid server, final String feature) {
1154 return connection.disco.containsKey(server) &&
1155 connection.disco.get(server).features.contains(feature);
1156 }
1157
1158 public boolean carbons() {
1159 return hasDiscoFeature(account.getServer(), "urn:xmpp:carbons:2");
1160 }
1161
1162 public boolean blocking() {
1163 return hasDiscoFeature(account.getServer(), Xmlns.BLOCKING);
1164 }
1165
1166 public boolean register() {
1167 return hasDiscoFeature(account.getServer(), Xmlns.REGISTER);
1168 }
1169
1170 public boolean sm() {
1171 return streamId != null
1172 || (connection.streamFeatures != null && connection.streamFeatures.hasChild("sm"));
1173 }
1174
1175 public boolean csi() {
1176 return connection.streamFeatures != null && connection.streamFeatures.hasChild("csi", "urn:xmpp:csi:0");
1177 }
1178
1179 public boolean pep() {
1180 final Pair<String,String> needle = new Pair<>("pubsub","pep");
1181 Info info = disco.get(account.getServer());
1182 if (info != null && info.identities.contains(needle)) {
1183 return true;
1184 } else {
1185 info = disco.get(account.getJid().toBareJid());
1186 return info != null && info.identities.contains(needle);
1187 }
1188 }
1189
1190 public boolean mam() {
1191 if (hasDiscoFeature(account.getJid().toBareJid(), "urn:xmpp:mam:0")) {
1192 return true;
1193 } else {
1194 return hasDiscoFeature(account.getServer(), "urn:xmpp:mam:0");
1195 }
1196 }
1197
1198 public boolean advancedStreamFeaturesLoaded() {
1199 return disco.containsKey(account.getServer());
1200 }
1201
1202 public boolean rosterVersioning() {
1203 return connection.streamFeatures != null && connection.streamFeatures.hasChild("ver");
1204 }
1205
1206 public void setBlockListRequested(boolean value) {
1207 this.blockListRequested = value;
1208 }
1209
1210 public boolean httpUpload() {
1211 return findDiscoItemsByFeature(Xmlns.HTTP_UPLOAD).size() > 0;
1212 }
1213 }
1214
1215 private IqGenerator getIqGenerator() {
1216 return mXmppConnectionService.getIqGenerator();
1217 }
1218}