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