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, 20000);
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 if (result.containsKey("error")
204 && "nosrv".equals(result.getString("error", null))) {
205 socket = new Socket(account.getServer().getDomainpart(), 5222);
206 } else {
207 throw new IOException("unhandled exception in DNS resolver");
208 }
209 final OutputStream out = socket.getOutputStream();
210 tagWriter.setOutputStream(out);
211 final InputStream in = socket.getInputStream();
212 tagReader.setInputStream(in);
213 tagWriter.beginDocument();
214 sendStartStream();
215 Tag nextTag;
216 while ((nextTag = tagReader.readTag()) != null) {
217 if (nextTag.isStart("stream")) {
218 processStream(nextTag);
219 break;
220 } else {
221 throw new IOException("unknown tag on connect");
222 }
223 }
224 if (socket.isConnected()) {
225 socket.close();
226 }
227 } catch (final IncompatibleServerException e) {
228 this.changeStatus(Account.State.INCOMPATIBLE_SERVER);
229 } catch (final SecurityException e) {
230 this.changeStatus(Account.State.SECURITY_ERROR);
231 } catch (final UnauthorizedException e) {
232 this.changeStatus(Account.State.UNAUTHORIZED);
233 } catch (final UnknownHostException | ConnectException e) {
234 this.changeStatus(Account.State.SERVER_NOT_FOUND);
235 } catch (final IOException | XmlPullParserException | NoSuchAlgorithmException e) {
236 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": " + e.getMessage());
237 this.changeStatus(Account.State.OFFLINE);
238 this.attempt--; //don't count attempt when reconnecting instantly anyway
239 } finally {
240 if (socket != null) {
241 try {
242 socket.close();
243 } catch (IOException e) {
244
245 }
246 }
247 if (wakeLock.isHeld()) {
248 try {
249 wakeLock.release();
250 } catch (final RuntimeException ignored) {
251 }
252 }
253 }
254 }
255
256 @Override
257 public void run() {
258 try {
259 if (socket != null) {
260 socket.close();
261 }
262 } catch (final IOException ignored) {
263
264 }
265 connect();
266 }
267
268 private void processStream(final Tag currentTag) throws XmlPullParserException,
269 IOException, NoSuchAlgorithmException {
270 Tag nextTag = tagReader.readTag();
271
272 while ((nextTag != null) && (!nextTag.isEnd("stream"))) {
273 if (nextTag.isStart("error")) {
274 processStreamError(nextTag);
275 } else if (nextTag.isStart("features")) {
276 processStreamFeatures(nextTag);
277 } else if (nextTag.isStart("proceed")) {
278 switchOverToTls(nextTag);
279 } else if (nextTag.isStart("success")) {
280 final String challenge = tagReader.readElement(nextTag).getContent();
281 try {
282 saslMechanism.getResponse(challenge);
283 } catch (final SaslMechanism.AuthenticationException e) {
284 disconnect(true);
285 Log.e(Config.LOGTAG, String.valueOf(e));
286 }
287 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": logged in");
288 account.setKey(Account.PINNED_MECHANISM_KEY,
289 String.valueOf(saslMechanism.getPriority()));
290 tagReader.reset();
291 sendStartStream();
292 processStream(tagReader.readTag());
293 break;
294 } else if (nextTag.isStart("failure")) {
295 throw new UnauthorizedException();
296 } else if (nextTag.isStart("challenge")) {
297 final String challenge = tagReader.readElement(nextTag).getContent();
298 final Element response = new Element("response");
299 response.setAttribute("xmlns",
300 "urn:ietf:params:xml:ns:xmpp-sasl");
301 try {
302 response.setContent(saslMechanism.getResponse(challenge));
303 } catch (final SaslMechanism.AuthenticationException e) {
304 // TODO: Send auth abort tag.
305 Log.e(Config.LOGTAG, e.toString());
306 }
307 tagWriter.writeElement(response);
308 } else if (nextTag.isStart("enabled")) {
309 final Element enabled = tagReader.readElement(nextTag);
310 if ("true".equals(enabled.getAttribute("resume"))) {
311 this.streamId = enabled.getAttribute("id");
312 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
313 + ": stream managment(" + smVersion
314 + ") enabled (resumable)");
315 } else {
316 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
317 + ": stream managment(" + smVersion + ") enabled");
318 }
319 this.lastSessionStarted = SystemClock.elapsedRealtime();
320 this.stanzasReceived = 0;
321 final RequestPacket r = new RequestPacket(smVersion);
322 tagWriter.writeStanzaAsync(r);
323 } else if (nextTag.isStart("resumed")) {
324 lastPacketReceived = SystemClock.elapsedRealtime();
325 final Element resumed = tagReader.readElement(nextTag);
326 final String h = resumed.getAttribute("h");
327 try {
328 final int serverCount = Integer.parseInt(h);
329 if (serverCount != stanzasSent) {
330 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
331 + ": session resumed with lost packages");
332 stanzasSent = serverCount;
333 } else {
334 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
335 + ": session resumed");
336 }
337 if (acknowledgedListener != null) {
338 for (int i = 0; i < messageReceipts.size(); ++i) {
339 if (serverCount >= messageReceipts.keyAt(i)) {
340 acknowledgedListener.onMessageAcknowledged(
341 account, messageReceipts.valueAt(i));
342 }
343 }
344 }
345 messageReceipts.clear();
346 } catch (final NumberFormatException ignored) {
347 }
348 sendServiceDiscoveryInfo(account.getServer());
349 sendServiceDiscoveryInfo(account.getJid().toBareJid());
350 sendServiceDiscoveryItems(account.getServer());
351 sendInitialPing();
352 } else if (nextTag.isStart("r")) {
353 tagReader.readElement(nextTag);
354 if (Config.EXTENDED_SM_LOGGING) {
355 Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": acknowledging stanza #" + this.stanzasReceived);
356 }
357 final AckPacket ack = new AckPacket(this.stanzasReceived, smVersion);
358 tagWriter.writeStanzaAsync(ack);
359 } else if (nextTag.isStart("a")) {
360 final Element ack = tagReader.readElement(nextTag);
361 lastPacketReceived = SystemClock.elapsedRealtime();
362 final int serverSequence = Integer.parseInt(ack.getAttribute("h"));
363 if (Config.EXTENDED_SM_LOGGING) {
364 Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": server acknowledged stanza #" + serverSequence);
365 }
366 final String msgId = this.messageReceipts.get(serverSequence);
367 if (msgId != null) {
368 if (this.acknowledgedListener != null) {
369 this.acknowledgedListener.onMessageAcknowledged(
370 account, msgId);
371 }
372 this.messageReceipts.remove(serverSequence);
373 }
374 } else if (nextTag.isStart("failed")) {
375 tagReader.readElement(nextTag);
376 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": resumption failed");
377 streamId = null;
378 if (account.getStatus() != Account.State.ONLINE) {
379 sendBindRequest();
380 }
381 } else if (nextTag.isStart("iq")) {
382 processIq(nextTag);
383 } else if (nextTag.isStart("message")) {
384 processMessage(nextTag);
385 } else if (nextTag.isStart("presence")) {
386 processPresence(nextTag);
387 }
388 nextTag = tagReader.readTag();
389 }
390 if (account.getStatus() == Account.State.ONLINE) {
391 account. setStatus(Account.State.OFFLINE);
392 if (statusListener != null) {
393 statusListener.onStatusChanged(account);
394 }
395 }
396 }
397
398 private void sendInitialPing() {
399 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": sending intial ping");
400 final IqPacket iq = new IqPacket(IqPacket.TYPE.GET);
401 iq.setFrom(account.getJid());
402 iq.addChild("ping", "urn:xmpp:ping");
403 this.sendIqPacket(iq, new OnIqPacketReceived() {
404 @Override
405 public void onIqPacketReceived(final Account account, final IqPacket packet) {
406 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
407 + ": online with resource " + account.getResource());
408 changeStatus(Account.State.ONLINE);
409 }
410 });
411 }
412
413 private Element processPacket(final Tag currentTag, final int packetType)
414 throws XmlPullParserException, IOException {
415 Element element;
416 switch (packetType) {
417 case PACKET_IQ:
418 element = new IqPacket();
419 break;
420 case PACKET_MESSAGE:
421 element = new MessagePacket();
422 break;
423 case PACKET_PRESENCE:
424 element = new PresencePacket();
425 break;
426 default:
427 return null;
428 }
429 element.setAttributes(currentTag.getAttributes());
430 Tag nextTag = tagReader.readTag();
431 if (nextTag == null) {
432 throw new IOException("interrupted mid tag");
433 }
434 while (!nextTag.isEnd(element.getName())) {
435 if (!nextTag.isNo()) {
436 final Element child = tagReader.readElement(nextTag);
437 final String type = currentTag.getAttribute("type");
438 if (packetType == PACKET_IQ
439 && "jingle".equals(child.getName())
440 && ("set".equalsIgnoreCase(type) || "get"
441 .equalsIgnoreCase(type))) {
442 element = new JinglePacket();
443 element.setAttributes(currentTag.getAttributes());
444 }
445 element.addChild(child);
446 }
447 nextTag = tagReader.readTag();
448 if (nextTag == null) {
449 throw new IOException("interrupted mid tag");
450 }
451 }
452 if (stanzasReceived == Integer.MAX_VALUE) {
453 resetStreamId();
454 throw new IOException("time to restart the session. cant handle >2 billion pcks");
455 }
456 ++stanzasReceived;
457 lastPacketReceived = SystemClock.elapsedRealtime();
458 return element;
459 }
460
461 private void processIq(final Tag currentTag) throws XmlPullParserException, IOException {
462 final IqPacket packet = (IqPacket) processPacket(currentTag, PACKET_IQ);
463
464 if (packet.getId() == null) {
465 return; // an iq packet without id is definitely invalid
466 }
467
468 if (packet instanceof JinglePacket) {
469 if (this.jingleListener != null) {
470 this.jingleListener.onJinglePacketReceived(account,(JinglePacket) packet);
471 }
472 } else {
473 if (packetCallbacks.containsKey(packet.getId())) {
474 final Pair<IqPacket, OnIqPacketReceived> packetCallbackDuple = packetCallbacks.get(packet.getId());
475 // Packets to the server should have responses from the server
476 if (packetCallbackDuple.first.toServer(account)) {
477 if (packet.fromServer(account)) {
478 packetCallbackDuple.second.onIqPacketReceived(account, packet);
479 packetCallbacks.remove(packet.getId());
480 } else {
481 Log.e(Config.LOGTAG,account.getJid().toBareJid().toString()+": ignoring spoofed iq packet");
482 }
483 } else {
484 if (packet.getFrom().equals(packetCallbackDuple.first.getTo())) {
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 }
491 } else if (packet.getType() == IqPacket.TYPE.GET|| packet.getType() == IqPacket.TYPE.SET) {
492 this.unregisteredIqListener.onIqPacketReceived(account, packet);
493 }
494 }
495 }
496
497 private void processMessage(final Tag currentTag) throws XmlPullParserException, IOException {
498 final MessagePacket packet = (MessagePacket) processPacket(currentTag,PACKET_MESSAGE);
499 this.messageListener.onMessagePacketReceived(account, packet);
500 }
501
502 private void processPresence(final Tag currentTag) throws XmlPullParserException, IOException {
503 PresencePacket packet = (PresencePacket) processPacket(currentTag, PACKET_PRESENCE);
504 this.presenceListener.onPresencePacketReceived(account, packet);
505 }
506
507 private void sendStartTLS() throws IOException {
508 final Tag startTLS = Tag.empty("starttls");
509 startTLS.setAttribute("xmlns", "urn:ietf:params:xml:ns:xmpp-tls");
510 tagWriter.writeTag(startTLS);
511 }
512
513 private SharedPreferences getPreferences() {
514 return PreferenceManager.getDefaultSharedPreferences(applicationContext);
515 }
516
517 private boolean enableLegacySSL() {
518 return getPreferences().getBoolean("enable_legacy_ssl", false);
519 }
520
521 private void switchOverToTls(final Tag currentTag) throws XmlPullParserException, IOException {
522 tagReader.readTag();
523 try {
524 final SSLContext sc = SSLContext.getInstance("TLS");
525 sc.init(null,new X509TrustManager[]{this.mXmppConnectionService.getMemorizingTrustManager()},mXmppConnectionService.getRNG());
526 final SSLSocketFactory factory = sc.getSocketFactory();
527 final HostnameVerifier verifier = this.mXmppConnectionService.getMemorizingTrustManager().wrapHostnameVerifier(new StrictHostnameVerifier());
528 final InetAddress address = socket == null ? null : socket.getInetAddress();
529
530 if (factory == null || address == null || verifier == null) {
531 throw new IOException("could not setup ssl");
532 }
533
534 final SSLSocket sslSocket = (SSLSocket) factory.createSocket(socket,address.getHostAddress(), socket.getPort(),true);
535
536 if (sslSocket == null) {
537 throw new IOException("could not initialize ssl socket");
538 }
539
540 final String[] supportProtocols;
541 final Collection<String> supportedProtocols = new LinkedList<>(
542 Arrays.asList(sslSocket.getSupportedProtocols()));
543 supportedProtocols.remove("SSLv3");
544 supportProtocols = supportedProtocols.toArray(new String[supportedProtocols.size()]);
545
546 sslSocket.setEnabledProtocols(supportProtocols);
547
548 final String[] cipherSuites = CryptoHelper.getOrderedCipherSuites(
549 sslSocket.getSupportedCipherSuites());
550 //Log.d(Config.LOGTAG, "Using ciphers: " + Arrays.toString(cipherSuites));
551 if (cipherSuites.length > 0) {
552 sslSocket.setEnabledCipherSuites(cipherSuites);
553 }
554
555 if (!verifier.verify(account.getServer().getDomainpart(),sslSocket.getSession())) {
556 Log.d(Config.LOGTAG,account.getJid().toBareJid()+": TLS certificate verification failed");
557 throw new SecurityException();
558 }
559 tagReader.setInputStream(sslSocket.getInputStream());
560 tagWriter.setOutputStream(sslSocket.getOutputStream());
561 sendStartStream();
562 Log.d(Config.LOGTAG, account.getJid().toBareJid()+ ": TLS connection established");
563 features.encryptionEnabled = true;
564 processStream(tagReader.readTag());
565 sslSocket.close();
566 } catch (final NoSuchAlgorithmException | KeyManagementException e1) {
567 Log.d(Config.LOGTAG,account.getJid().toBareJid()+": TLS certificate verification failed");
568 throw new SecurityException();
569 }
570 }
571
572 private void processStreamFeatures(final Tag currentTag)
573 throws XmlPullParserException, IOException {
574 this.streamFeatures = tagReader.readElement(currentTag);
575 if (this.streamFeatures.hasChild("starttls") && !features.encryptionEnabled) {
576 sendStartTLS();
577 } else if (this.streamFeatures.hasChild("register")
578 && account.isOptionSet(Account.OPTION_REGISTER)
579 && features.encryptionEnabled) {
580 sendRegistryRequest();
581 } else if (!this.streamFeatures.hasChild("register")
582 && account.isOptionSet(Account.OPTION_REGISTER)) {
583 changeStatus(Account.State.REGISTRATION_NOT_SUPPORTED);
584 disconnect(true);
585 } else if (this.streamFeatures.hasChild("mechanisms")
586 && shouldAuthenticate && features.encryptionEnabled) {
587 final List<String> mechanisms = extractMechanisms(streamFeatures
588 .findChild("mechanisms"));
589 final Element auth = new Element("auth");
590 auth.setAttribute("xmlns", "urn:ietf:params:xml:ns:xmpp-sasl");
591 if (mechanisms.contains("SCRAM-SHA-1")) {
592 saslMechanism = new ScramSha1(tagWriter, account, mXmppConnectionService.getRNG());
593 } else if (mechanisms.contains("PLAIN")) {
594 saslMechanism = new Plain(tagWriter, account);
595 } else if (mechanisms.contains("DIGEST-MD5")) {
596 saslMechanism = new DigestMd5(tagWriter, account, mXmppConnectionService.getRNG());
597 }
598 if (saslMechanism != null) {
599 final JSONObject keys = account.getKeys();
600 try {
601 if (keys.has(Account.PINNED_MECHANISM_KEY) &&
602 keys.getInt(Account.PINNED_MECHANISM_KEY) > saslMechanism.getPriority()) {
603 Log.e(Config.LOGTAG, "Auth failed. Authentication mechanism " + saslMechanism.getMechanism() +
604 " has lower priority (" + String.valueOf(saslMechanism.getPriority()) +
605 ") than pinned priority (" + keys.getInt(Account.PINNED_MECHANISM_KEY) +
606 "). Possible downgrade attack?");
607 throw new SecurityException();
608 }
609 } catch (final JSONException e) {
610 Log.d(Config.LOGTAG, "Parse error while checking pinned auth mechanism");
611 }
612 Log.d(Config.LOGTAG, account.getJid().toString() + ": Authenticating with " + saslMechanism.getMechanism());
613 auth.setAttribute("mechanism", saslMechanism.getMechanism());
614 if (!saslMechanism.getClientFirstMessage().isEmpty()) {
615 auth.setContent(saslMechanism.getClientFirstMessage());
616 }
617 tagWriter.writeElement(auth);
618 } else {
619 throw new IncompatibleServerException();
620 }
621 } else if (this.streamFeatures.hasChild("sm", "urn:xmpp:sm:"
622 + smVersion)
623 && streamId != null) {
624 if (Config.EXTENDED_SM_LOGGING) {
625 Log.d(Config.LOGTAG,account.getJid().toBareJid()+": resuming after stanza #"+stanzasReceived);
626 }
627 final ResumePacket resume = new ResumePacket(this.streamId, stanzasReceived, smVersion);
628 this.tagWriter.writeStanzaAsync(resume);
629 } else if (this.streamFeatures.hasChild("bind") && shouldBind) {
630 sendBindRequest();
631 } else {
632 disconnect(true);
633 changeStatus(Account.State.INCOMPATIBLE_SERVER);
634 }
635 }
636
637 private List<String> extractMechanisms(final Element stream) {
638 final ArrayList<String> mechanisms = new ArrayList<>(stream
639 .getChildren().size());
640 for (final Element child : stream.getChildren()) {
641 mechanisms.add(child.getContent());
642 }
643 return mechanisms;
644 }
645
646 private void sendRegistryRequest() {
647 final IqPacket register = new IqPacket(IqPacket.TYPE.GET);
648 register.query("jabber:iq:register");
649 register.setTo(account.getServer());
650 sendIqPacket(register, new OnIqPacketReceived() {
651
652 @Override
653 public void onIqPacketReceived(final Account account, final IqPacket packet) {
654 final Element instructions = packet.query().findChild("instructions");
655 if (packet.query().hasChild("username")
656 && (packet.query().hasChild("password"))) {
657 final IqPacket register = new IqPacket(IqPacket.TYPE.SET);
658 final Element username = new Element("username").setContent(account.getUsername());
659 final Element password = new Element("password").setContent(account.getPassword());
660 register.query("jabber:iq:register").addChild(username);
661 register.query().addChild(password);
662 sendIqPacket(register, new OnIqPacketReceived() {
663
664 @Override
665 public void onIqPacketReceived(final Account account, final IqPacket packet) {
666 if (packet.getType() == IqPacket.TYPE.RESULT) {
667 account.setOption(Account.OPTION_REGISTER,
668 false);
669 changeStatus(Account.State.REGISTRATION_SUCCESSFUL);
670 } else if (packet.hasChild("error")
671 && (packet.findChild("error")
672 .hasChild("conflict"))) {
673 changeStatus(Account.State.REGISTRATION_CONFLICT);
674 } else {
675 changeStatus(Account.State.REGISTRATION_FAILED);
676 Log.d(Config.LOGTAG, packet.toString());
677 }
678 disconnect(true);
679 }
680 });
681 } else {
682 changeStatus(Account.State.REGISTRATION_FAILED);
683 disconnect(true);
684 Log.d(Config.LOGTAG, account.getJid().toBareJid()
685 + ": could not register. instructions are"
686 + (instructions != null ? instructions.getContent() : ""));
687 }
688 }
689 });
690 }
691
692 private void sendBindRequest() {
693 while(!mXmppConnectionService.areMessagesInitialized()) {
694 try {
695 Thread.sleep(500);
696 } catch (final InterruptedException ignored) {
697 }
698 }
699 final IqPacket iq = new IqPacket(IqPacket.TYPE.SET);
700 iq.addChild("bind", "urn:ietf:params:xml:ns:xmpp-bind")
701 .addChild("resource").setContent(account.getResource());
702 this.sendUnmodifiedIqPacket(iq, new OnIqPacketReceived() {
703 @Override
704 public void onIqPacketReceived(final Account account, final IqPacket packet) {
705 final Element bind = packet.findChild("bind");
706 if (bind != null) {
707 final Element jid = bind.findChild("jid");
708 if (jid != null && jid.getContent() != null) {
709 try {
710 account.setResource(Jid.fromString(jid.getContent()).getResourcepart());
711 } catch (final InvalidJidException e) {
712 // TODO: Handle the case where an external JID is technically invalid?
713 }
714 if (streamFeatures.hasChild("session")) {
715 sendStartSession();
716 } else {
717 sendPostBindInitialization();
718 }
719 } else {
720 disconnect(true);
721 }
722 } else {
723 disconnect(true);
724 }
725 }
726 });
727 }
728
729 private void sendStartSession() {
730 final IqPacket startSession = new IqPacket(IqPacket.TYPE.SET);
731 startSession.addChild("session","urn:ietf:params:xml:ns:xmpp-session");
732 this.sendUnmodifiedIqPacket(startSession, new OnIqPacketReceived() {
733 @Override
734 public void onIqPacketReceived(Account account, IqPacket packet) {
735 if (packet.getType() == IqPacket.TYPE.RESULT) {
736 sendPostBindInitialization();
737 } else {
738 disconnect(true);
739 }
740 }
741 });
742 }
743
744 private void sendPostBindInitialization() {
745 smVersion = 0;
746 if (streamFeatures.hasChild("sm", "urn:xmpp:sm:3")) {
747 smVersion = 3;
748 } else if (streamFeatures.hasChild("sm", "urn:xmpp:sm:2")) {
749 smVersion = 2;
750 }
751 if (smVersion != 0) {
752 final EnablePacket enable = new EnablePacket(smVersion);
753 tagWriter.writeStanzaAsync(enable);
754 stanzasSent = 0;
755 messageReceipts.clear();
756 }
757 features.carbonsEnabled = false;
758 features.blockListRequested = false;
759 disco.clear();
760 sendServiceDiscoveryInfo(account.getServer());
761 sendServiceDiscoveryInfo(account.getJid().toBareJid());
762 sendServiceDiscoveryItems(account.getServer());
763 if (bindListener != null) {
764 bindListener.onBind(account);
765 }
766 sendInitialPing();
767 }
768
769 private void sendServiceDiscoveryInfo(final Jid jid) {
770 if (disco.containsKey(jid)) {
771 if (account.getServer().equals(jid)) {
772 enableAdvancedStreamFeatures();
773 }
774 } else {
775 final IqPacket iq = new IqPacket(IqPacket.TYPE.GET);
776 iq.setTo(jid);
777 iq.query("http://jabber.org/protocol/disco#info");
778 this.sendIqPacket(iq, new OnIqPacketReceived() {
779
780 @Override
781 public void onIqPacketReceived(final Account account, final IqPacket packet) {
782 final List<Element> elements = packet.query().getChildren();
783 final Info info = new Info();
784 for (final Element element : elements) {
785 if (element.getName().equals("identity")) {
786 String type = element.getAttribute("type");
787 String category = element.getAttribute("category");
788 if (type != null && category != null) {
789 info.identities.add(new Pair<>(category,type));
790 }
791 } else if (element.getName().equals("feature")) {
792 info.features.add(element.getAttribute("var"));
793 }
794 }
795 disco.put(jid, info);
796
797 if (account.getServer().equals(jid)) {
798 enableAdvancedStreamFeatures();
799 for (final OnAdvancedStreamFeaturesLoaded listener : advancedStreamFeaturesLoadedListeners) {
800 listener.onAdvancedStreamFeaturesAvailable(account);
801 }
802 }
803 }
804 });
805 }
806 }
807
808 private void enableAdvancedStreamFeatures() {
809 if (getFeatures().carbons() && !features.carbonsEnabled) {
810 sendEnableCarbons();
811 }
812 if (getFeatures().blocking() && !features.blockListRequested) {
813 Log.d(Config.LOGTAG,account.getJid().toBareJid()+": Requesting block list");
814 this.sendIqPacket(getIqGenerator().generateGetBlockList(), mXmppConnectionService.getIqParser());
815 }
816 }
817
818 private void sendServiceDiscoveryItems(final Jid server) {
819 final IqPacket iq = new IqPacket(IqPacket.TYPE.GET);
820 iq.setTo(server.toDomainJid());
821 iq.query("http://jabber.org/protocol/disco#items");
822 this.sendIqPacket(iq, new OnIqPacketReceived() {
823
824 @Override
825 public void onIqPacketReceived(final Account account, final IqPacket packet) {
826 final List<Element> elements = packet.query().getChildren();
827 for (final Element element : elements) {
828 if (element.getName().equals("item")) {
829 final Jid jid = element.getAttributeAsJid("jid");
830 if (jid != null && !jid.equals(account.getServer())) {
831 sendServiceDiscoveryInfo(jid);
832 }
833 }
834 }
835 }
836 });
837 }
838
839 private void sendEnableCarbons() {
840 final IqPacket iq = new IqPacket(IqPacket.TYPE.SET);
841 iq.addChild("enable", "urn:xmpp:carbons:2");
842 this.sendIqPacket(iq, new OnIqPacketReceived() {
843
844 @Override
845 public void onIqPacketReceived(final Account account, final IqPacket packet) {
846 if (!packet.hasChild("error")) {
847 Log.d(Config.LOGTAG, account.getJid().toBareJid()
848 + ": successfully enabled carbons");
849 features.carbonsEnabled = true;
850 } else {
851 Log.d(Config.LOGTAG, account.getJid().toBareJid()
852 + ": error enableing carbons " + packet.toString());
853 }
854 }
855 });
856 }
857
858 private void processStreamError(final Tag currentTag)
859 throws XmlPullParserException, IOException {
860 final Element streamError = tagReader.readElement(currentTag);
861 if (streamError != null && streamError.hasChild("conflict")) {
862 final String resource = account.getResource().split("\\.")[0];
863 account.setResource(resource + "." + nextRandomId());
864 Log.d(Config.LOGTAG,
865 account.getJid().toBareJid() + ": switching resource due to conflict ("
866 + account.getResource() + ")");
867 }
868 }
869
870 private void sendStartStream() throws IOException {
871 final Tag stream = Tag.start("stream:stream");
872 stream.setAttribute("from", account.getJid().toBareJid().toString());
873 stream.setAttribute("to", account.getServer().toString());
874 stream.setAttribute("version", "1.0");
875 stream.setAttribute("xml:lang", "en");
876 stream.setAttribute("xmlns", "jabber:client");
877 stream.setAttribute("xmlns:stream", "http://etherx.jabber.org/streams");
878 tagWriter.writeTag(stream);
879 }
880
881 private String nextRandomId() {
882 return new BigInteger(50, mXmppConnectionService.getRNG()).toString(32);
883 }
884
885 public void sendIqPacket(final IqPacket packet, final OnIqPacketReceived callback) {
886 packet.setFrom(account.getJid());
887 this.sendUnmodifiedIqPacket(packet,callback);
888
889 }
890
891 private synchronized void sendUnmodifiedIqPacket(final IqPacket packet, final OnIqPacketReceived callback) {
892 if (packet.getId() == null) {
893 final String id = nextRandomId();
894 packet.setAttribute("id", id);
895 }
896 if (callback != null) {
897 if (packet.getId() == null) {
898 packet.setId(nextRandomId());
899 }
900 packetCallbacks.put(packet.getId(), new Pair<>(packet, callback));
901 }
902 this.sendPacket(packet);
903 }
904
905 public void sendMessagePacket(final MessagePacket packet) {
906 this.sendPacket(packet);
907 }
908
909 public void sendPresencePacket(final PresencePacket packet) {
910 this.sendPacket(packet);
911 }
912
913 private synchronized void sendPacket(final AbstractStanza packet) {
914 if (stanzasSent == Integer.MAX_VALUE) {
915 resetStreamId();
916 disconnect(true);
917 return;
918 }
919 final String name = packet.getName();
920 if (name.equals("iq") || name.equals("message") || name.equals("presence")) {
921 ++stanzasSent;
922 }
923 tagWriter.writeStanzaAsync(packet);
924 if (packet instanceof MessagePacket && packet.getId() != null && this.streamId != null) {
925 if (Config.EXTENDED_SM_LOGGING) {
926 Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": requesting ack for message stanza #" + stanzasSent);
927 }
928 this.messageReceipts.put(stanzasSent, packet.getId());
929 tagWriter.writeStanzaAsync(new RequestPacket(this.smVersion));
930 }
931 }
932
933 public void sendPing() {
934 if (streamFeatures.hasChild("sm")) {
935 tagWriter.writeStanzaAsync(new RequestPacket(smVersion));
936 } else {
937 final IqPacket iq = new IqPacket(IqPacket.TYPE.GET);
938 iq.setFrom(account.getJid());
939 iq.addChild("ping", "urn:xmpp:ping");
940 this.sendIqPacket(iq, null);
941 }
942 this.lastPingSent = SystemClock.elapsedRealtime();
943 }
944
945 public void setOnMessagePacketReceivedListener(
946 final OnMessagePacketReceived listener) {
947 this.messageListener = listener;
948 }
949
950 public void setOnUnregisteredIqPacketReceivedListener(
951 final OnIqPacketReceived listener) {
952 this.unregisteredIqListener = listener;
953 }
954
955 public void setOnPresencePacketReceivedListener(
956 final OnPresencePacketReceived listener) {
957 this.presenceListener = listener;
958 }
959
960 public void setOnJinglePacketReceivedListener(
961 final OnJinglePacketReceived listener) {
962 this.jingleListener = listener;
963 }
964
965 public void setOnStatusChangedListener(final OnStatusChanged listener) {
966 this.statusListener = listener;
967 }
968
969 public void setOnBindListener(final OnBindListener listener) {
970 this.bindListener = listener;
971 }
972
973 public void setOnMessageAcknowledgeListener(final OnMessageAcknowledged listener) {
974 this.acknowledgedListener = listener;
975 }
976
977 public void addOnAdvancedStreamFeaturesAvailableListener(final OnAdvancedStreamFeaturesLoaded listener) {
978 if (!this.advancedStreamFeaturesLoadedListeners.contains(listener)) {
979 this.advancedStreamFeaturesLoadedListeners.add(listener);
980 }
981 }
982
983 public void disconnect(final boolean force) {
984 Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": disconnecting");
985 try {
986 if (force) {
987 socket.close();
988 return;
989 }
990 new Thread(new Runnable() {
991
992 @Override
993 public void run() {
994 if (tagWriter.isActive()) {
995 tagWriter.finish();
996 try {
997 while (!tagWriter.finished()) {
998 Log.d(Config.LOGTAG, "not yet finished");
999 Thread.sleep(100);
1000 }
1001 tagWriter.writeTag(Tag.end("stream:stream"));
1002 socket.close();
1003 } catch (final IOException e) {
1004 Log.d(Config.LOGTAG,
1005 "io exception during disconnect");
1006 } catch (final InterruptedException e) {
1007 Log.d(Config.LOGTAG, "interrupted");
1008 }
1009 }
1010 }
1011 }).start();
1012 } catch (final IOException e) {
1013 Log.d(Config.LOGTAG, "io exception during disconnect");
1014 }
1015 }
1016
1017 public void resetStreamId() {
1018 this.streamId = null;
1019 }
1020
1021 public List<String> findDiscoItemsByFeature(final String feature) {
1022 final List<String> items = new ArrayList<>();
1023 for (final Entry<Jid, Info> cursor : disco.entrySet()) {
1024 if (cursor.getValue().features.contains(feature)) {
1025 items.add(cursor.getKey().toString());
1026 }
1027 }
1028 return items;
1029 }
1030
1031 public String findDiscoItemByFeature(final String feature) {
1032 final List<String> items = findDiscoItemsByFeature(feature);
1033 if (items.size() >= 1) {
1034 return items.get(0);
1035 }
1036 return null;
1037 }
1038
1039 public void r() {
1040 this.tagWriter.writeStanzaAsync(new RequestPacket(smVersion));
1041 }
1042
1043 public String getMucServer() {
1044 for (final Entry<Jid, Info> cursor : disco.entrySet()) {
1045 final Info value = cursor.getValue();
1046 if (value.features.contains("http://jabber.org/protocol/muc")
1047 && !value.features.contains("jabber:iq:gateway")
1048 && !value.identities.contains(new Pair<>("conference","irc"))) {
1049 return cursor.getKey().toString();
1050 }
1051 }
1052 return null;
1053 }
1054
1055 public int getTimeToNextAttempt() {
1056 final int interval = (int) (25 * Math.pow(1.5, attempt));
1057 final int secondsSinceLast = (int) ((SystemClock.elapsedRealtime() - this.lastConnect) / 1000);
1058 return interval - secondsSinceLast;
1059 }
1060
1061 public int getAttempt() {
1062 return this.attempt;
1063 }
1064
1065 public Features getFeatures() {
1066 return this.features;
1067 }
1068
1069 public long getLastSessionEstablished() {
1070 final long diff;
1071 if (this.lastSessionStarted == 0) {
1072 diff = SystemClock.elapsedRealtime() - this.lastConnect;
1073 } else {
1074 diff = SystemClock.elapsedRealtime() - this.lastSessionStarted;
1075 }
1076 return System.currentTimeMillis() - diff;
1077 }
1078
1079 public long getLastConnect() {
1080 return this.lastConnect;
1081 }
1082
1083 public long getLastPingSent() {
1084 return this.lastPingSent;
1085 }
1086
1087 public long getLastPacketReceived() {
1088 return this.lastPacketReceived;
1089 }
1090
1091 public void sendActive() {
1092 this.sendPacket(new ActivePacket());
1093 }
1094
1095 public void sendInactive() {
1096 this.sendPacket(new InactivePacket());
1097 }
1098
1099 public void resetAttemptCount() {
1100 this.attempt = 0;
1101 this.lastConnect = 0;
1102 }
1103
1104 private class Info {
1105 public final ArrayList<String> features = new ArrayList<>();
1106 public final ArrayList<Pair<String,String>> identities = new ArrayList<>();
1107 }
1108
1109 private class UnauthorizedException extends IOException {
1110
1111 }
1112
1113 private class SecurityException extends IOException {
1114
1115 }
1116
1117 private class IncompatibleServerException extends IOException {
1118
1119 }
1120
1121 public class Features {
1122 XmppConnection connection;
1123 private boolean carbonsEnabled = false;
1124 private boolean encryptionEnabled = false;
1125 private boolean blockListRequested = false;
1126
1127 public Features(final XmppConnection connection) {
1128 this.connection = connection;
1129 }
1130
1131 private boolean hasDiscoFeature(final Jid server, final String feature) {
1132 return connection.disco.containsKey(server) &&
1133 connection.disco.get(server).features.contains(feature);
1134 }
1135
1136 public boolean carbons() {
1137 return hasDiscoFeature(account.getServer(), "urn:xmpp:carbons:2");
1138 }
1139
1140 public boolean blocking() {
1141 return hasDiscoFeature(account.getServer(), Xmlns.BLOCKING);
1142 }
1143
1144 public boolean register() {
1145 return hasDiscoFeature(account.getServer(), Xmlns.REGISTER);
1146 }
1147
1148 public boolean sm() {
1149 return streamId != null
1150 || (connection.streamFeatures != null && connection.streamFeatures.hasChild("sm"));
1151 }
1152
1153 public boolean csi() {
1154 return connection.streamFeatures != null && connection.streamFeatures.hasChild("csi", "urn:xmpp:csi:0");
1155 }
1156
1157 public boolean pep() {
1158 final Pair<String,String> needle = new Pair<>("pubsub","pep");
1159 Info info = disco.get(account.getServer());
1160 if (info != null && info.identities.contains(needle)) {
1161 return true;
1162 } else {
1163 info = disco.get(account.getJid().toBareJid());
1164 return info != null && info.identities.contains(needle);
1165 }
1166 }
1167
1168 public boolean mam() {
1169 if (hasDiscoFeature(account.getJid().toBareJid(), "urn:xmpp:mam:0")) {
1170 return true;
1171 } else {
1172 return hasDiscoFeature(account.getServer(), "urn:xmpp:mam:0");
1173 }
1174 }
1175
1176 public boolean advancedStreamFeaturesLoaded() {
1177 return disco.containsKey(account.getServer());
1178 }
1179
1180 public boolean rosterVersioning() {
1181 return connection.streamFeatures != null && connection.streamFeatures.hasChild("ver");
1182 }
1183
1184 public void setBlockListRequested(boolean value) {
1185 this.blockListRequested = value;
1186 }
1187 }
1188
1189 private IqGenerator getIqGenerator() {
1190 return mXmppConnectionService.getIqGenerator();
1191 }
1192}