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 if (DNSHelper.isIp(account.getServer().toString())) {
159 socket = new Socket();
160 try {
161 socket.connect(new InetSocketAddress(account.getServer().toString(), 5222), Config.SOCKET_TIMEOUT * 1000);
162 } catch (IOException e) {
163 throw new UnknownHostException();
164 }
165 } else {
166 final Bundle result = DNSHelper.getSRVRecord(account.getServer());
167 final ArrayList<Parcelable> values = result.getParcelableArrayList("values");
168 if ("timeout".equals(result.getString("error"))) {
169 throw new IOException("timeout in dns");
170 } else if (values != null) {
171 int i = 0;
172 boolean socketError = true;
173 while (socketError && values.size() > i) {
174 final Bundle namePort = (Bundle) values.get(i);
175 try {
176 String srvRecordServer;
177 try {
178 srvRecordServer = IDN.toASCII(namePort.getString("name"));
179 } catch (final IllegalArgumentException e) {
180 // TODO: Handle me?`
181 srvRecordServer = "";
182 }
183 final int srvRecordPort = namePort.getInt("port");
184 final String srvIpServer = namePort.getString("ip");
185 final InetSocketAddress addr;
186 if (srvIpServer != null) {
187 addr = new InetSocketAddress(srvIpServer, srvRecordPort);
188 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
189 + ": using values from dns " + srvRecordServer
190 + "[" + srvIpServer + "]:" + srvRecordPort);
191 } else {
192 addr = new InetSocketAddress(srvRecordServer, srvRecordPort);
193 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
194 + ": using values from dns "
195 + srvRecordServer + ":" + srvRecordPort);
196 }
197 socket = new Socket();
198 socket.connect(addr, Config.SOCKET_TIMEOUT * 1000);
199 socketError = false;
200 } catch (final UnknownHostException e) {
201 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": " + e.getMessage());
202 i++;
203 } catch (final IOException e) {
204 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": " + e.getMessage());
205 i++;
206 }
207 }
208 if (socketError) {
209 throw new UnknownHostException();
210 }
211 } else {
212 throw new IOException("unhandled exception in DNS resolver");
213 }
214 }
215 final OutputStream out = socket.getOutputStream();
216 tagWriter.setOutputStream(out);
217 final InputStream in = socket.getInputStream();
218 tagReader.setInputStream(in);
219 tagWriter.beginDocument();
220 sendStartStream();
221 Tag nextTag;
222 while ((nextTag = tagReader.readTag()) != null) {
223 if (nextTag.isStart("stream")) {
224 processStream(nextTag);
225 break;
226 } else {
227 throw new IOException("unknown tag on connect");
228 }
229 }
230 if (socket.isConnected()) {
231 socket.close();
232 }
233 } catch (final IncompatibleServerException e) {
234 this.changeStatus(Account.State.INCOMPATIBLE_SERVER);
235 } catch (final SecurityException e) {
236 this.changeStatus(Account.State.SECURITY_ERROR);
237 } catch (final UnauthorizedException e) {
238 this.changeStatus(Account.State.UNAUTHORIZED);
239 } catch (final UnknownHostException | ConnectException e) {
240 this.changeStatus(Account.State.SERVER_NOT_FOUND);
241 } catch (final IOException | XmlPullParserException | NoSuchAlgorithmException e) {
242 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": " + e.getMessage());
243 this.changeStatus(Account.State.OFFLINE);
244 this.attempt--; //don't count attempt when reconnecting instantly anyway
245 } finally {
246 if (socket != null) {
247 try {
248 socket.close();
249 } catch (IOException e) {
250
251 }
252 }
253 if (wakeLock.isHeld()) {
254 try {
255 wakeLock.release();
256 } catch (final RuntimeException ignored) {
257 }
258 }
259 }
260 }
261
262 @Override
263 public void run() {
264 try {
265 if (socket != null) {
266 socket.close();
267 }
268 } catch (final IOException ignored) {
269
270 }
271 connect();
272 }
273
274 private void processStream(final Tag currentTag) throws XmlPullParserException,
275 IOException, NoSuchAlgorithmException {
276 Tag nextTag = tagReader.readTag();
277
278 while ((nextTag != null) && (!nextTag.isEnd("stream"))) {
279 if (nextTag.isStart("error")) {
280 processStreamError(nextTag);
281 } else if (nextTag.isStart("features")) {
282 processStreamFeatures(nextTag);
283 } else if (nextTag.isStart("proceed")) {
284 switchOverToTls(nextTag);
285 } else if (nextTag.isStart("success")) {
286 final String challenge = tagReader.readElement(nextTag).getContent();
287 try {
288 saslMechanism.getResponse(challenge);
289 } catch (final SaslMechanism.AuthenticationException e) {
290 disconnect(true);
291 Log.e(Config.LOGTAG, String.valueOf(e));
292 }
293 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": logged in");
294 account.setKey(Account.PINNED_MECHANISM_KEY,
295 String.valueOf(saslMechanism.getPriority()));
296 tagReader.reset();
297 sendStartStream();
298 processStream(tagReader.readTag());
299 break;
300 } else if (nextTag.isStart("failure")) {
301 throw new UnauthorizedException();
302 } else if (nextTag.isStart("challenge")) {
303 final String challenge = tagReader.readElement(nextTag).getContent();
304 final Element response = new Element("response");
305 response.setAttribute("xmlns",
306 "urn:ietf:params:xml:ns:xmpp-sasl");
307 try {
308 response.setContent(saslMechanism.getResponse(challenge));
309 } catch (final SaslMechanism.AuthenticationException e) {
310 // TODO: Send auth abort tag.
311 Log.e(Config.LOGTAG, e.toString());
312 }
313 tagWriter.writeElement(response);
314 } else if (nextTag.isStart("enabled")) {
315 final Element enabled = tagReader.readElement(nextTag);
316 if ("true".equals(enabled.getAttribute("resume"))) {
317 this.streamId = enabled.getAttribute("id");
318 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
319 + ": stream managment(" + smVersion
320 + ") enabled (resumable)");
321 } else {
322 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
323 + ": stream managment(" + smVersion + ") enabled");
324 }
325 this.lastSessionStarted = SystemClock.elapsedRealtime();
326 this.stanzasReceived = 0;
327 final RequestPacket r = new RequestPacket(smVersion);
328 tagWriter.writeStanzaAsync(r);
329 } else if (nextTag.isStart("resumed")) {
330 lastPacketReceived = SystemClock.elapsedRealtime();
331 final Element resumed = tagReader.readElement(nextTag);
332 final String h = resumed.getAttribute("h");
333 try {
334 final int serverCount = Integer.parseInt(h);
335 if (serverCount != stanzasSent) {
336 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
337 + ": session resumed with lost packages");
338 stanzasSent = serverCount;
339 } else {
340 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
341 + ": session resumed");
342 }
343 if (acknowledgedListener != null) {
344 for (int i = 0; i < messageReceipts.size(); ++i) {
345 if (serverCount >= messageReceipts.keyAt(i)) {
346 acknowledgedListener.onMessageAcknowledged(
347 account, messageReceipts.valueAt(i));
348 }
349 }
350 }
351 messageReceipts.clear();
352 } catch (final NumberFormatException ignored) {
353 }
354 sendServiceDiscoveryInfo(account.getServer());
355 sendServiceDiscoveryInfo(account.getJid().toBareJid());
356 sendServiceDiscoveryItems(account.getServer());
357 sendInitialPing();
358 } else if (nextTag.isStart("r")) {
359 tagReader.readElement(nextTag);
360 if (Config.EXTENDED_SM_LOGGING) {
361 Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": acknowledging stanza #" + this.stanzasReceived);
362 }
363 final AckPacket ack = new AckPacket(this.stanzasReceived, smVersion);
364 tagWriter.writeStanzaAsync(ack);
365 } else if (nextTag.isStart("a")) {
366 final Element ack = tagReader.readElement(nextTag);
367 lastPacketReceived = SystemClock.elapsedRealtime();
368 try {
369 final int serverSequence = Integer.parseInt(ack.getAttribute("h"));
370 if (Config.EXTENDED_SM_LOGGING) {
371 Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": server acknowledged stanza #" + serverSequence);
372 }
373 final String msgId = this.messageReceipts.get(serverSequence);
374 if (msgId != null) {
375 if (this.acknowledgedListener != null) {
376 this.acknowledgedListener.onMessageAcknowledged(
377 account, msgId);
378 }
379 this.messageReceipts.remove(serverSequence);
380 }
381 } catch (NumberFormatException e) {
382 Log.d(Config.LOGTAG,account.getJid().toBareJid()+": server send ack without sequence number");
383 }
384 } else if (nextTag.isStart("failed")) {
385 tagReader.readElement(nextTag);
386 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": resumption failed");
387 streamId = null;
388 if (account.getStatus() != Account.State.ONLINE) {
389 sendBindRequest();
390 }
391 } else if (nextTag.isStart("iq")) {
392 processIq(nextTag);
393 } else if (nextTag.isStart("message")) {
394 processMessage(nextTag);
395 } else if (nextTag.isStart("presence")) {
396 processPresence(nextTag);
397 }
398 nextTag = tagReader.readTag();
399 }
400 if (account.getStatus() == Account.State.ONLINE) {
401 account. setStatus(Account.State.OFFLINE);
402 if (statusListener != null) {
403 statusListener.onStatusChanged(account);
404 }
405 }
406 }
407
408 private void sendInitialPing() {
409 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": sending intial ping");
410 final IqPacket iq = new IqPacket(IqPacket.TYPE.GET);
411 iq.setFrom(account.getJid());
412 iq.addChild("ping", "urn:xmpp:ping");
413 this.sendIqPacket(iq, new OnIqPacketReceived() {
414 @Override
415 public void onIqPacketReceived(final Account account, final IqPacket packet) {
416 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
417 + ": online with resource " + account.getResource());
418 changeStatus(Account.State.ONLINE);
419 }
420 });
421 }
422
423 private Element processPacket(final Tag currentTag, final int packetType)
424 throws XmlPullParserException, IOException {
425 Element element;
426 switch (packetType) {
427 case PACKET_IQ:
428 element = new IqPacket();
429 break;
430 case PACKET_MESSAGE:
431 element = new MessagePacket();
432 break;
433 case PACKET_PRESENCE:
434 element = new PresencePacket();
435 break;
436 default:
437 return null;
438 }
439 element.setAttributes(currentTag.getAttributes());
440 Tag nextTag = tagReader.readTag();
441 if (nextTag == null) {
442 throw new IOException("interrupted mid tag");
443 }
444 while (!nextTag.isEnd(element.getName())) {
445 if (!nextTag.isNo()) {
446 final Element child = tagReader.readElement(nextTag);
447 final String type = currentTag.getAttribute("type");
448 if (packetType == PACKET_IQ
449 && "jingle".equals(child.getName())
450 && ("set".equalsIgnoreCase(type) || "get"
451 .equalsIgnoreCase(type))) {
452 element = new JinglePacket();
453 element.setAttributes(currentTag.getAttributes());
454 }
455 element.addChild(child);
456 }
457 nextTag = tagReader.readTag();
458 if (nextTag == null) {
459 throw new IOException("interrupted mid tag");
460 }
461 }
462 if (stanzasReceived == Integer.MAX_VALUE) {
463 resetStreamId();
464 throw new IOException("time to restart the session. cant handle >2 billion pcks");
465 }
466 ++stanzasReceived;
467 lastPacketReceived = SystemClock.elapsedRealtime();
468 return element;
469 }
470
471 private void processIq(final Tag currentTag) throws XmlPullParserException, IOException {
472 final IqPacket packet = (IqPacket) processPacket(currentTag, PACKET_IQ);
473
474 if (packet.getId() == null) {
475 return; // an iq packet without id is definitely invalid
476 }
477
478 if (packet instanceof JinglePacket) {
479 if (this.jingleListener != null) {
480 this.jingleListener.onJinglePacketReceived(account,(JinglePacket) packet);
481 }
482 } else {
483 if (packetCallbacks.containsKey(packet.getId())) {
484 final Pair<IqPacket, OnIqPacketReceived> packetCallbackDuple = packetCallbacks.get(packet.getId());
485 // Packets to the server should have responses from the server
486 if (packetCallbackDuple.first.toServer(account)) {
487 if (packet.fromServer(account)) {
488 packetCallbackDuple.second.onIqPacketReceived(account, packet);
489 packetCallbacks.remove(packet.getId());
490 } else {
491 Log.e(Config.LOGTAG,account.getJid().toBareJid().toString()+": ignoring spoofed iq packet");
492 }
493 } else {
494 if (packet.getFrom().equals(packetCallbackDuple.first.getTo())) {
495 packetCallbackDuple.second.onIqPacketReceived(account, packet);
496 packetCallbacks.remove(packet.getId());
497 } else {
498 Log.e(Config.LOGTAG,account.getJid().toBareJid().toString()+": ignoring spoofed iq packet");
499 }
500 }
501 } else if (packet.getType() == IqPacket.TYPE.GET|| packet.getType() == IqPacket.TYPE.SET) {
502 this.unregisteredIqListener.onIqPacketReceived(account, packet);
503 }
504 }
505 }
506
507 private void processMessage(final Tag currentTag) throws XmlPullParserException, IOException {
508 final MessagePacket packet = (MessagePacket) processPacket(currentTag,PACKET_MESSAGE);
509 this.messageListener.onMessagePacketReceived(account, packet);
510 }
511
512 private void processPresence(final Tag currentTag) throws XmlPullParserException, IOException {
513 PresencePacket packet = (PresencePacket) processPacket(currentTag, PACKET_PRESENCE);
514 this.presenceListener.onPresencePacketReceived(account, packet);
515 }
516
517 private void sendStartTLS() throws IOException {
518 final Tag startTLS = Tag.empty("starttls");
519 startTLS.setAttribute("xmlns", "urn:ietf:params:xml:ns:xmpp-tls");
520 tagWriter.writeTag(startTLS);
521 }
522
523 private SharedPreferences getPreferences() {
524 return PreferenceManager.getDefaultSharedPreferences(applicationContext);
525 }
526
527 private boolean enableLegacySSL() {
528 return getPreferences().getBoolean("enable_legacy_ssl", false);
529 }
530
531 private void switchOverToTls(final Tag currentTag) throws XmlPullParserException, IOException {
532 tagReader.readTag();
533 try {
534 final SSLContext sc = SSLContext.getInstance("TLS");
535 sc.init(null,new X509TrustManager[]{this.mXmppConnectionService.getMemorizingTrustManager()},mXmppConnectionService.getRNG());
536 final SSLSocketFactory factory = sc.getSocketFactory();
537 final HostnameVerifier verifier = this.mXmppConnectionService.getMemorizingTrustManager().wrapHostnameVerifier(new StrictHostnameVerifier());
538 final InetAddress address = socket == null ? null : socket.getInetAddress();
539
540 if (factory == null || address == null || verifier == null) {
541 throw new IOException("could not setup ssl");
542 }
543
544 final SSLSocket sslSocket = (SSLSocket) factory.createSocket(socket,address.getHostAddress(), socket.getPort(),true);
545
546 if (sslSocket == null) {
547 throw new IOException("could not initialize ssl socket");
548 }
549
550 final String[] supportProtocols;
551 final Collection<String> supportedProtocols = new LinkedList<>(
552 Arrays.asList(sslSocket.getSupportedProtocols()));
553 supportedProtocols.remove("SSLv3");
554 supportProtocols = supportedProtocols.toArray(new String[supportedProtocols.size()]);
555
556 sslSocket.setEnabledProtocols(supportProtocols);
557
558 final String[] cipherSuites = CryptoHelper.getOrderedCipherSuites(
559 sslSocket.getSupportedCipherSuites());
560 //Log.d(Config.LOGTAG, "Using ciphers: " + Arrays.toString(cipherSuites));
561 if (cipherSuites.length > 0) {
562 sslSocket.setEnabledCipherSuites(cipherSuites);
563 }
564
565 if (!verifier.verify(account.getServer().getDomainpart(),sslSocket.getSession())) {
566 Log.d(Config.LOGTAG,account.getJid().toBareJid()+": TLS certificate verification failed");
567 throw new SecurityException();
568 }
569 tagReader.setInputStream(sslSocket.getInputStream());
570 tagWriter.setOutputStream(sslSocket.getOutputStream());
571 sendStartStream();
572 Log.d(Config.LOGTAG, account.getJid().toBareJid()+ ": TLS connection established");
573 features.encryptionEnabled = true;
574 processStream(tagReader.readTag());
575 sslSocket.close();
576 } catch (final NoSuchAlgorithmException | KeyManagementException e1) {
577 Log.d(Config.LOGTAG,account.getJid().toBareJid()+": TLS certificate verification failed");
578 throw new SecurityException();
579 }
580 }
581
582 private void processStreamFeatures(final Tag currentTag)
583 throws XmlPullParserException, IOException {
584 this.streamFeatures = tagReader.readElement(currentTag);
585 if (this.streamFeatures.hasChild("starttls") && !features.encryptionEnabled) {
586 sendStartTLS();
587 } else if (this.streamFeatures.hasChild("register")
588 && account.isOptionSet(Account.OPTION_REGISTER)
589 && features.encryptionEnabled) {
590 sendRegistryRequest();
591 } else if (!this.streamFeatures.hasChild("register")
592 && account.isOptionSet(Account.OPTION_REGISTER)) {
593 changeStatus(Account.State.REGISTRATION_NOT_SUPPORTED);
594 disconnect(true);
595 } else if (this.streamFeatures.hasChild("mechanisms")
596 && shouldAuthenticate && features.encryptionEnabled) {
597 final List<String> mechanisms = extractMechanisms(streamFeatures
598 .findChild("mechanisms"));
599 final Element auth = new Element("auth");
600 auth.setAttribute("xmlns", "urn:ietf:params:xml:ns:xmpp-sasl");
601 if (mechanisms.contains("SCRAM-SHA-1")) {
602 saslMechanism = new ScramSha1(tagWriter, account, mXmppConnectionService.getRNG());
603 } else if (mechanisms.contains("PLAIN")) {
604 saslMechanism = new Plain(tagWriter, account);
605 } else if (mechanisms.contains("DIGEST-MD5")) {
606 saslMechanism = new DigestMd5(tagWriter, account, mXmppConnectionService.getRNG());
607 }
608 if (saslMechanism != null) {
609 final JSONObject keys = account.getKeys();
610 try {
611 if (keys.has(Account.PINNED_MECHANISM_KEY) &&
612 keys.getInt(Account.PINNED_MECHANISM_KEY) > saslMechanism.getPriority()) {
613 Log.e(Config.LOGTAG, "Auth failed. Authentication mechanism " + saslMechanism.getMechanism() +
614 " has lower priority (" + String.valueOf(saslMechanism.getPriority()) +
615 ") than pinned priority (" + keys.getInt(Account.PINNED_MECHANISM_KEY) +
616 "). Possible downgrade attack?");
617 throw new SecurityException();
618 }
619 } catch (final JSONException e) {
620 Log.d(Config.LOGTAG, "Parse error while checking pinned auth mechanism");
621 }
622 Log.d(Config.LOGTAG, account.getJid().toString() + ": Authenticating with " + saslMechanism.getMechanism());
623 auth.setAttribute("mechanism", saslMechanism.getMechanism());
624 if (!saslMechanism.getClientFirstMessage().isEmpty()) {
625 auth.setContent(saslMechanism.getClientFirstMessage());
626 }
627 tagWriter.writeElement(auth);
628 } else {
629 throw new IncompatibleServerException();
630 }
631 } else if (this.streamFeatures.hasChild("sm", "urn:xmpp:sm:"
632 + smVersion)
633 && streamId != null) {
634 if (Config.EXTENDED_SM_LOGGING) {
635 Log.d(Config.LOGTAG,account.getJid().toBareJid()+": resuming after stanza #"+stanzasReceived);
636 }
637 final ResumePacket resume = new ResumePacket(this.streamId, stanzasReceived, smVersion);
638 this.tagWriter.writeStanzaAsync(resume);
639 } else if (this.streamFeatures.hasChild("bind") && shouldBind) {
640 sendBindRequest();
641 } else {
642 disconnect(true);
643 changeStatus(Account.State.INCOMPATIBLE_SERVER);
644 }
645 }
646
647 private List<String> extractMechanisms(final Element stream) {
648 final ArrayList<String> mechanisms = new ArrayList<>(stream
649 .getChildren().size());
650 for (final Element child : stream.getChildren()) {
651 mechanisms.add(child.getContent());
652 }
653 return mechanisms;
654 }
655
656 private void sendRegistryRequest() {
657 final IqPacket register = new IqPacket(IqPacket.TYPE.GET);
658 register.query("jabber:iq:register");
659 register.setTo(account.getServer());
660 sendIqPacket(register, new OnIqPacketReceived() {
661
662 @Override
663 public void onIqPacketReceived(final Account account, final IqPacket packet) {
664 final Element instructions = packet.query().findChild("instructions");
665 if (packet.query().hasChild("username")
666 && (packet.query().hasChild("password"))) {
667 final IqPacket register = new IqPacket(IqPacket.TYPE.SET);
668 final Element username = new Element("username").setContent(account.getUsername());
669 final Element password = new Element("password").setContent(account.getPassword());
670 register.query("jabber:iq:register").addChild(username);
671 register.query().addChild(password);
672 sendIqPacket(register, new OnIqPacketReceived() {
673
674 @Override
675 public void onIqPacketReceived(final Account account, final IqPacket packet) {
676 if (packet.getType() == IqPacket.TYPE.RESULT) {
677 account.setOption(Account.OPTION_REGISTER,
678 false);
679 changeStatus(Account.State.REGISTRATION_SUCCESSFUL);
680 } else if (packet.hasChild("error")
681 && (packet.findChild("error")
682 .hasChild("conflict"))) {
683 changeStatus(Account.State.REGISTRATION_CONFLICT);
684 } else {
685 changeStatus(Account.State.REGISTRATION_FAILED);
686 Log.d(Config.LOGTAG, packet.toString());
687 }
688 disconnect(true);
689 }
690 });
691 } else {
692 changeStatus(Account.State.REGISTRATION_FAILED);
693 disconnect(true);
694 Log.d(Config.LOGTAG, account.getJid().toBareJid()
695 + ": could not register. instructions are"
696 + (instructions != null ? instructions.getContent() : ""));
697 }
698 }
699 });
700 }
701
702 private void sendBindRequest() {
703 while(!mXmppConnectionService.areMessagesInitialized()) {
704 try {
705 Thread.sleep(500);
706 } catch (final InterruptedException ignored) {
707 }
708 }
709 final IqPacket iq = new IqPacket(IqPacket.TYPE.SET);
710 iq.addChild("bind", "urn:ietf:params:xml:ns:xmpp-bind")
711 .addChild("resource").setContent(account.getResource());
712 this.sendUnmodifiedIqPacket(iq, new OnIqPacketReceived() {
713 @Override
714 public void onIqPacketReceived(final Account account, final IqPacket packet) {
715 final Element bind = packet.findChild("bind");
716 if (bind != null) {
717 final Element jid = bind.findChild("jid");
718 if (jid != null && jid.getContent() != null) {
719 try {
720 account.setResource(Jid.fromString(jid.getContent()).getResourcepart());
721 } catch (final InvalidJidException e) {
722 // TODO: Handle the case where an external JID is technically invalid?
723 }
724 if (streamFeatures.hasChild("session")) {
725 sendStartSession();
726 } else {
727 sendPostBindInitialization();
728 }
729 } else {
730 disconnect(true);
731 }
732 } else {
733 disconnect(true);
734 }
735 }
736 });
737 }
738
739 private void sendStartSession() {
740 final IqPacket startSession = new IqPacket(IqPacket.TYPE.SET);
741 startSession.addChild("session","urn:ietf:params:xml:ns:xmpp-session");
742 this.sendUnmodifiedIqPacket(startSession, new OnIqPacketReceived() {
743 @Override
744 public void onIqPacketReceived(Account account, IqPacket packet) {
745 if (packet.getType() == IqPacket.TYPE.RESULT) {
746 sendPostBindInitialization();
747 } else {
748 disconnect(true);
749 }
750 }
751 });
752 }
753
754 private void sendPostBindInitialization() {
755 smVersion = 0;
756 if (streamFeatures.hasChild("sm", "urn:xmpp:sm:3")) {
757 smVersion = 3;
758 } else if (streamFeatures.hasChild("sm", "urn:xmpp:sm:2")) {
759 smVersion = 2;
760 }
761 if (smVersion != 0) {
762 final EnablePacket enable = new EnablePacket(smVersion);
763 tagWriter.writeStanzaAsync(enable);
764 stanzasSent = 0;
765 messageReceipts.clear();
766 }
767 features.carbonsEnabled = false;
768 features.blockListRequested = false;
769 disco.clear();
770 sendServiceDiscoveryInfo(account.getServer());
771 sendServiceDiscoveryInfo(account.getJid().toBareJid());
772 sendServiceDiscoveryItems(account.getServer());
773 if (bindListener != null) {
774 bindListener.onBind(account);
775 }
776 sendInitialPing();
777 }
778
779 private void sendServiceDiscoveryInfo(final Jid jid) {
780 if (disco.containsKey(jid)) {
781 if (account.getServer().equals(jid)) {
782 enableAdvancedStreamFeatures();
783 }
784 } else {
785 final IqPacket iq = new IqPacket(IqPacket.TYPE.GET);
786 iq.setTo(jid);
787 iq.query("http://jabber.org/protocol/disco#info");
788 this.sendIqPacket(iq, new OnIqPacketReceived() {
789
790 @Override
791 public void onIqPacketReceived(final Account account, final IqPacket packet) {
792 final List<Element> elements = packet.query().getChildren();
793 final Info info = new Info();
794 for (final Element element : elements) {
795 if (element.getName().equals("identity")) {
796 String type = element.getAttribute("type");
797 String category = element.getAttribute("category");
798 if (type != null && category != null) {
799 info.identities.add(new Pair<>(category,type));
800 }
801 } else if (element.getName().equals("feature")) {
802 info.features.add(element.getAttribute("var"));
803 }
804 }
805 disco.put(jid, info);
806
807 if (account.getServer().equals(jid)) {
808 enableAdvancedStreamFeatures();
809 for (final OnAdvancedStreamFeaturesLoaded listener : advancedStreamFeaturesLoadedListeners) {
810 listener.onAdvancedStreamFeaturesAvailable(account);
811 }
812 }
813 }
814 });
815 }
816 }
817
818 private void enableAdvancedStreamFeatures() {
819 if (getFeatures().carbons() && !features.carbonsEnabled) {
820 sendEnableCarbons();
821 }
822 if (getFeatures().blocking() && !features.blockListRequested) {
823 Log.d(Config.LOGTAG,account.getJid().toBareJid()+": Requesting block list");
824 this.sendIqPacket(getIqGenerator().generateGetBlockList(), mXmppConnectionService.getIqParser());
825 }
826 }
827
828 private void sendServiceDiscoveryItems(final Jid server) {
829 final IqPacket iq = new IqPacket(IqPacket.TYPE.GET);
830 iq.setTo(server.toDomainJid());
831 iq.query("http://jabber.org/protocol/disco#items");
832 this.sendIqPacket(iq, new OnIqPacketReceived() {
833
834 @Override
835 public void onIqPacketReceived(final Account account, final IqPacket packet) {
836 final List<Element> elements = packet.query().getChildren();
837 for (final Element element : elements) {
838 if (element.getName().equals("item")) {
839 final Jid jid = element.getAttributeAsJid("jid");
840 if (jid != null && !jid.equals(account.getServer())) {
841 sendServiceDiscoveryInfo(jid);
842 }
843 }
844 }
845 }
846 });
847 }
848
849 private void sendEnableCarbons() {
850 final IqPacket iq = new IqPacket(IqPacket.TYPE.SET);
851 iq.addChild("enable", "urn:xmpp:carbons:2");
852 this.sendIqPacket(iq, new OnIqPacketReceived() {
853
854 @Override
855 public void onIqPacketReceived(final Account account, final IqPacket packet) {
856 if (!packet.hasChild("error")) {
857 Log.d(Config.LOGTAG, account.getJid().toBareJid()
858 + ": successfully enabled carbons");
859 features.carbonsEnabled = true;
860 } else {
861 Log.d(Config.LOGTAG, account.getJid().toBareJid()
862 + ": error enableing carbons " + packet.toString());
863 }
864 }
865 });
866 }
867
868 private void processStreamError(final Tag currentTag)
869 throws XmlPullParserException, IOException {
870 final Element streamError = tagReader.readElement(currentTag);
871 if (streamError != null && streamError.hasChild("conflict")) {
872 final String resource = account.getResource().split("\\.")[0];
873 account.setResource(resource + "." + nextRandomId());
874 Log.d(Config.LOGTAG,
875 account.getJid().toBareJid() + ": switching resource due to conflict ("
876 + account.getResource() + ")");
877 }
878 }
879
880 private void sendStartStream() throws IOException {
881 final Tag stream = Tag.start("stream:stream");
882 stream.setAttribute("from", account.getJid().toBareJid().toString());
883 stream.setAttribute("to", account.getServer().toString());
884 stream.setAttribute("version", "1.0");
885 stream.setAttribute("xml:lang", "en");
886 stream.setAttribute("xmlns", "jabber:client");
887 stream.setAttribute("xmlns:stream", "http://etherx.jabber.org/streams");
888 tagWriter.writeTag(stream);
889 }
890
891 private String nextRandomId() {
892 return new BigInteger(50, mXmppConnectionService.getRNG()).toString(32);
893 }
894
895 public void sendIqPacket(final IqPacket packet, final OnIqPacketReceived callback) {
896 packet.setFrom(account.getJid());
897 this.sendUnmodifiedIqPacket(packet,callback);
898
899 }
900
901 private synchronized void sendUnmodifiedIqPacket(final IqPacket packet, final OnIqPacketReceived callback) {
902 if (packet.getId() == null) {
903 final String id = nextRandomId();
904 packet.setAttribute("id", id);
905 }
906 if (callback != null) {
907 if (packet.getId() == null) {
908 packet.setId(nextRandomId());
909 }
910 packetCallbacks.put(packet.getId(), new Pair<>(packet, callback));
911 }
912 this.sendPacket(packet);
913 }
914
915 public void sendMessagePacket(final MessagePacket packet) {
916 this.sendPacket(packet);
917 }
918
919 public void sendPresencePacket(final PresencePacket packet) {
920 this.sendPacket(packet);
921 }
922
923 private synchronized void sendPacket(final AbstractStanza packet) {
924 if (stanzasSent == Integer.MAX_VALUE) {
925 resetStreamId();
926 disconnect(true);
927 return;
928 }
929 final String name = packet.getName();
930 if (name.equals("iq") || name.equals("message") || name.equals("presence")) {
931 ++stanzasSent;
932 }
933 tagWriter.writeStanzaAsync(packet);
934 if (packet instanceof MessagePacket && packet.getId() != null && getFeatures().sm()) {
935 if (Config.EXTENDED_SM_LOGGING) {
936 Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": requesting ack for message stanza #" + stanzasSent);
937 }
938 this.messageReceipts.put(stanzasSent, packet.getId());
939 tagWriter.writeStanzaAsync(new RequestPacket(this.smVersion));
940 }
941 }
942
943 public void sendPing() {
944 if (streamFeatures.hasChild("sm")) {
945 tagWriter.writeStanzaAsync(new RequestPacket(smVersion));
946 } else {
947 final IqPacket iq = new IqPacket(IqPacket.TYPE.GET);
948 iq.setFrom(account.getJid());
949 iq.addChild("ping", "urn:xmpp:ping");
950 this.sendIqPacket(iq, null);
951 }
952 this.lastPingSent = SystemClock.elapsedRealtime();
953 }
954
955 public void setOnMessagePacketReceivedListener(
956 final OnMessagePacketReceived listener) {
957 this.messageListener = listener;
958 }
959
960 public void setOnUnregisteredIqPacketReceivedListener(
961 final OnIqPacketReceived listener) {
962 this.unregisteredIqListener = listener;
963 }
964
965 public void setOnPresencePacketReceivedListener(
966 final OnPresencePacketReceived listener) {
967 this.presenceListener = listener;
968 }
969
970 public void setOnJinglePacketReceivedListener(
971 final OnJinglePacketReceived listener) {
972 this.jingleListener = listener;
973 }
974
975 public void setOnStatusChangedListener(final OnStatusChanged listener) {
976 this.statusListener = listener;
977 }
978
979 public void setOnBindListener(final OnBindListener listener) {
980 this.bindListener = listener;
981 }
982
983 public void setOnMessageAcknowledgeListener(final OnMessageAcknowledged listener) {
984 this.acknowledgedListener = listener;
985 }
986
987 public void addOnAdvancedStreamFeaturesAvailableListener(final OnAdvancedStreamFeaturesLoaded listener) {
988 if (!this.advancedStreamFeaturesLoadedListeners.contains(listener)) {
989 this.advancedStreamFeaturesLoadedListeners.add(listener);
990 }
991 }
992
993 public void disconnect(final boolean force) {
994 Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": disconnecting");
995 try {
996 if (force) {
997 socket.close();
998 return;
999 }
1000 new Thread(new Runnable() {
1001
1002 @Override
1003 public void run() {
1004 if (tagWriter.isActive()) {
1005 tagWriter.finish();
1006 try {
1007 while (!tagWriter.finished()) {
1008 Log.d(Config.LOGTAG, "not yet finished");
1009 Thread.sleep(100);
1010 }
1011 tagWriter.writeTag(Tag.end("stream:stream"));
1012 socket.close();
1013 } catch (final IOException e) {
1014 Log.d(Config.LOGTAG,
1015 "io exception during disconnect");
1016 } catch (final InterruptedException e) {
1017 Log.d(Config.LOGTAG, "interrupted");
1018 }
1019 }
1020 }
1021 }).start();
1022 } catch (final IOException e) {
1023 Log.d(Config.LOGTAG, "io exception during disconnect");
1024 }
1025 }
1026
1027 public void resetStreamId() {
1028 this.streamId = null;
1029 }
1030
1031 public List<Jid> findDiscoItemsByFeature(final String feature) {
1032 final List<Jid> items = new ArrayList<>();
1033 for (final Entry<Jid, Info> cursor : disco.entrySet()) {
1034 if (cursor.getValue().features.contains(feature)) {
1035 items.add(cursor.getKey());
1036 }
1037 }
1038 return items;
1039 }
1040
1041 public Jid findDiscoItemByFeature(final String feature) {
1042 final List<Jid> items = findDiscoItemsByFeature(feature);
1043 if (items.size() >= 1) {
1044 return items.get(0);
1045 }
1046 return null;
1047 }
1048
1049 public void r() {
1050 this.tagWriter.writeStanzaAsync(new RequestPacket(smVersion));
1051 }
1052
1053 public String getMucServer() {
1054 for (final Entry<Jid, Info> cursor : disco.entrySet()) {
1055 final Info value = cursor.getValue();
1056 if (value.features.contains("http://jabber.org/protocol/muc")
1057 && !value.features.contains("jabber:iq:gateway")
1058 && !value.identities.contains(new Pair<>("conference","irc"))) {
1059 return cursor.getKey().toString();
1060 }
1061 }
1062 return null;
1063 }
1064
1065 public int getTimeToNextAttempt() {
1066 final int interval = (int) (25 * Math.pow(1.5, attempt));
1067 final int secondsSinceLast = (int) ((SystemClock.elapsedRealtime() - this.lastConnect) / 1000);
1068 return interval - secondsSinceLast;
1069 }
1070
1071 public int getAttempt() {
1072 return this.attempt;
1073 }
1074
1075 public Features getFeatures() {
1076 return this.features;
1077 }
1078
1079 public long getLastSessionEstablished() {
1080 final long diff;
1081 if (this.lastSessionStarted == 0) {
1082 diff = SystemClock.elapsedRealtime() - this.lastConnect;
1083 } else {
1084 diff = SystemClock.elapsedRealtime() - this.lastSessionStarted;
1085 }
1086 return System.currentTimeMillis() - diff;
1087 }
1088
1089 public long getLastConnect() {
1090 return this.lastConnect;
1091 }
1092
1093 public long getLastPingSent() {
1094 return this.lastPingSent;
1095 }
1096
1097 public long getLastPacketReceived() {
1098 return this.lastPacketReceived;
1099 }
1100
1101 public void sendActive() {
1102 this.sendPacket(new ActivePacket());
1103 }
1104
1105 public void sendInactive() {
1106 this.sendPacket(new InactivePacket());
1107 }
1108
1109 public void resetAttemptCount() {
1110 this.attempt = 0;
1111 this.lastConnect = 0;
1112 }
1113
1114 private class Info {
1115 public final ArrayList<String> features = new ArrayList<>();
1116 public final ArrayList<Pair<String,String>> identities = new ArrayList<>();
1117 }
1118
1119 private class UnauthorizedException extends IOException {
1120
1121 }
1122
1123 private class SecurityException extends IOException {
1124
1125 }
1126
1127 private class IncompatibleServerException extends IOException {
1128
1129 }
1130
1131 public class Features {
1132 XmppConnection connection;
1133 private boolean carbonsEnabled = false;
1134 private boolean encryptionEnabled = false;
1135 private boolean blockListRequested = false;
1136
1137 public Features(final XmppConnection connection) {
1138 this.connection = connection;
1139 }
1140
1141 private boolean hasDiscoFeature(final Jid server, final String feature) {
1142 return connection.disco.containsKey(server) &&
1143 connection.disco.get(server).features.contains(feature);
1144 }
1145
1146 public boolean carbons() {
1147 return hasDiscoFeature(account.getServer(), "urn:xmpp:carbons:2");
1148 }
1149
1150 public boolean blocking() {
1151 return hasDiscoFeature(account.getServer(), Xmlns.BLOCKING);
1152 }
1153
1154 public boolean register() {
1155 return hasDiscoFeature(account.getServer(), Xmlns.REGISTER);
1156 }
1157
1158 public boolean sm() {
1159 return streamId != null
1160 || (connection.streamFeatures != null && connection.streamFeatures.hasChild("sm"));
1161 }
1162
1163 public boolean csi() {
1164 return connection.streamFeatures != null && connection.streamFeatures.hasChild("csi", "urn:xmpp:csi:0");
1165 }
1166
1167 public boolean pep() {
1168 final Pair<String,String> needle = new Pair<>("pubsub","pep");
1169 Info info = disco.get(account.getServer());
1170 if (info != null && info.identities.contains(needle)) {
1171 return true;
1172 } else {
1173 info = disco.get(account.getJid().toBareJid());
1174 return info != null && info.identities.contains(needle);
1175 }
1176 }
1177
1178 public boolean mam() {
1179 if (hasDiscoFeature(account.getJid().toBareJid(), "urn:xmpp:mam:0")) {
1180 return true;
1181 } else {
1182 return hasDiscoFeature(account.getServer(), "urn:xmpp:mam:0");
1183 }
1184 }
1185
1186 public boolean advancedStreamFeaturesLoaded() {
1187 return disco.containsKey(account.getServer());
1188 }
1189
1190 public boolean rosterVersioning() {
1191 return connection.streamFeatures != null && connection.streamFeatures.hasChild("ver");
1192 }
1193
1194 public void setBlockListRequested(boolean value) {
1195 this.blockListRequested = value;
1196 }
1197
1198 public boolean httpUpload() {
1199 return findDiscoItemsByFeature(Xmlns.HTTP_UPLOAD).size() > 0;
1200 }
1201 }
1202
1203 private IqGenerator getIqGenerator() {
1204 return mXmppConnectionService.getIqGenerator();
1205 }
1206}