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