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