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