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.SparseArray;
13
14import org.apache.http.conn.ssl.StrictHostnameVerifier;
15import org.json.JSONException;
16import org.json.JSONObject;
17import org.xmlpull.v1.XmlPullParserException;
18
19import java.io.IOException;
20import java.io.InputStream;
21import java.io.OutputStream;
22import java.math.BigInteger;
23import java.net.IDN;
24import java.net.InetSocketAddress;
25import java.net.Socket;
26import java.net.UnknownHostException;
27import java.security.KeyManagementException;
28import java.security.NoSuchAlgorithmException;
29import java.util.ArrayList;
30import java.util.Arrays;
31import java.util.HashMap;
32import java.util.Hashtable;
33import java.util.LinkedList;
34import java.util.List;
35import java.util.Map.Entry;
36
37import javax.net.ssl.HostnameVerifier;
38import javax.net.ssl.SSLContext;
39import javax.net.ssl.SSLSocket;
40import javax.net.ssl.SSLSocketFactory;
41import javax.net.ssl.X509TrustManager;
42
43import eu.siacs.conversations.Config;
44import eu.siacs.conversations.crypto.sasl.DigestMd5;
45import eu.siacs.conversations.crypto.sasl.Plain;
46import eu.siacs.conversations.crypto.sasl.SaslMechanism;
47import eu.siacs.conversations.crypto.sasl.ScramSha1;
48import eu.siacs.conversations.entities.Account;
49import eu.siacs.conversations.services.XmppConnectionService;
50import eu.siacs.conversations.utils.DNSHelper;
51import eu.siacs.conversations.utils.zlib.ZLibInputStream;
52import eu.siacs.conversations.utils.zlib.ZLibOutputStream;
53import eu.siacs.conversations.xml.Element;
54import eu.siacs.conversations.xml.Tag;
55import eu.siacs.conversations.xml.TagWriter;
56import eu.siacs.conversations.xml.XmlReader;
57import eu.siacs.conversations.xmpp.jid.InvalidJidException;
58import eu.siacs.conversations.xmpp.jid.Jid;
59import eu.siacs.conversations.xmpp.jingle.OnJinglePacketReceived;
60import eu.siacs.conversations.xmpp.jingle.stanzas.JinglePacket;
61import eu.siacs.conversations.xmpp.stanzas.AbstractStanza;
62import eu.siacs.conversations.xmpp.stanzas.IqPacket;
63import eu.siacs.conversations.xmpp.stanzas.MessagePacket;
64import eu.siacs.conversations.xmpp.stanzas.PresencePacket;
65import eu.siacs.conversations.xmpp.stanzas.csi.ActivePacket;
66import eu.siacs.conversations.xmpp.stanzas.csi.InactivePacket;
67import eu.siacs.conversations.xmpp.stanzas.streammgmt.AckPacket;
68import eu.siacs.conversations.xmpp.stanzas.streammgmt.EnablePacket;
69import eu.siacs.conversations.xmpp.stanzas.streammgmt.RequestPacket;
70import eu.siacs.conversations.xmpp.stanzas.streammgmt.ResumePacket;
71
72public class XmppConnection implements Runnable {
73
74 private static final int PACKET_IQ = 0;
75 private static final int PACKET_MESSAGE = 1;
76 private static final int PACKET_PRESENCE = 2;
77 private final Context applicationContext;
78 protected Account account;
79 private WakeLock wakeLock;
80 private Socket socket;
81 private XmlReader tagReader;
82 private TagWriter tagWriter;
83 private Features features = new Features(this);
84 private boolean shouldBind = true;
85 private boolean shouldAuthenticate = true;
86 private Element streamFeatures;
87 private HashMap<String, List<String>> disco = new HashMap<>();
88
89 private String streamId = null;
90 private int smVersion = 3;
91 private SparseArray<String> messageReceipts = new SparseArray<>();
92
93 private boolean usingCompression = false;
94 private boolean usingEncryption = false;
95 private int stanzasReceived = 0;
96 private int stanzasSent = 0;
97 private long lastPaketReceived = 0;
98 private long lastPingSent = 0;
99 private long lastConnect = 0;
100 private long lastSessionStarted = 0;
101 private int attempt = 0;
102 private Hashtable<String, PacketReceived> packetCallbacks = new Hashtable<>();
103 private OnPresencePacketReceived presenceListener = null;
104 private OnJinglePacketReceived jingleListener = null;
105 private OnIqPacketReceived unregisteredIqListener = null;
106 private OnMessagePacketReceived messageListener = null;
107 private OnStatusChanged statusListener = null;
108 private OnBindListener bindListener = null;
109 private OnMessageAcknowledged acknowledgedListener = null;
110 private XmppConnectionService mXmppConnectionService = null;
111
112 private SaslMechanism saslMechanism;
113
114 public XmppConnection(Account account, XmppConnectionService service) {
115 this.account = account;
116 this.wakeLock = service.getPowerManager().newWakeLock(
117 PowerManager.PARTIAL_WAKE_LOCK, account.getJid().toBareJid().toString());
118 tagWriter = new TagWriter();
119 mXmppConnectionService = service;
120 applicationContext = service.getApplicationContext();
121 }
122
123 protected void changeStatus(final Account.State nextStatus) {
124 if (account.getStatus() != nextStatus) {
125 if ((nextStatus == Account.State.OFFLINE)
126 && (account.getStatus() != Account.State.CONNECTING)
127 && (account.getStatus() != Account.State.ONLINE)
128 && (account.getStatus() != Account.State.DISABLED)) {
129 return;
130 }
131 if (nextStatus == Account.State.ONLINE) {
132 this.attempt = 0;
133 }
134 account.setStatus(nextStatus);
135 if (statusListener != null) {
136 statusListener.onStatusChanged(account);
137 }
138 }
139 }
140
141 protected void connect() {
142 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": connecting");
143 usingCompression = false;
144 usingEncryption = false;
145 lastConnect = SystemClock.elapsedRealtime();
146 lastPingSent = SystemClock.elapsedRealtime();
147 this.attempt++;
148 try {
149 shouldAuthenticate = shouldBind = !account
150 .isOptionSet(Account.OPTION_REGISTER);
151 tagReader = new XmlReader(wakeLock);
152 tagWriter = new TagWriter();
153 packetCallbacks.clear();
154 this.changeStatus(Account.State.CONNECTING);
155 Bundle result = DNSHelper.getSRVRecord(account.getServer());
156 ArrayList<Parcelable> values = result.getParcelableArrayList("values");
157 if ("timeout".equals(result.getString("error"))) {
158 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": dns timeout");
159 this.changeStatus(Account.State.OFFLINE);
160 return;
161 } else if (values != null) {
162 int i = 0;
163 boolean socketError = true;
164 while (socketError && values.size() > i) {
165 Bundle namePort = (Bundle) values.get(i);
166 try {
167 String srvRecordServer;
168 try {
169 srvRecordServer=IDN.toASCII(namePort.getString("name"));
170 } catch (final IllegalArgumentException e) {
171 // TODO: Handle me?`
172 srvRecordServer = "";
173 }
174 int srvRecordPort = namePort.getInt("port");
175 String srvIpServer = namePort.getString("ipv4");
176 InetSocketAddress addr;
177 if (srvIpServer != null) {
178 addr = new InetSocketAddress(srvIpServer, srvRecordPort);
179 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
180 + ": using values from dns " + srvRecordServer
181 + "[" + srvIpServer + "]:" + srvRecordPort);
182 } else {
183 addr = new InetSocketAddress(srvRecordServer, srvRecordPort);
184 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
185 + ": using values from dns "
186 + srvRecordServer + ":" + srvRecordPort);
187 }
188 socket = new Socket();
189 socket.connect(addr, 20000);
190 socketError = false;
191 } catch (UnknownHostException e) {
192 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": " + e.getMessage());
193 i++;
194 } catch (IOException e) {
195 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": " + e.getMessage());
196 i++;
197 }
198 }
199 if (socketError) {
200 this.changeStatus(Account.State.SERVER_NOT_FOUND);
201 if (wakeLock.isHeld()) {
202 try {
203 wakeLock.release();
204 } catch (final RuntimeException ignored) {
205 }
206 }
207 return;
208 }
209 } else if (result.containsKey("error")
210 && "nosrv".equals(result.getString("error", null))) {
211 socket = new Socket(account.getServer().getDomainpart(), 5222);
212 } else {
213 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
214 + ": timeout in DNS resolution");
215 changeStatus(Account.State.OFFLINE);
216 return;
217 }
218 OutputStream out = socket.getOutputStream();
219 tagWriter.setOutputStream(out);
220 InputStream in = socket.getInputStream();
221 tagReader.setInputStream(in);
222 tagWriter.beginDocument();
223 sendStartStream();
224 Tag nextTag;
225 while ((nextTag = tagReader.readTag()) != null) {
226 if (nextTag.isStart("stream")) {
227 processStream(nextTag);
228 break;
229 } else {
230 Log.d(Config.LOGTAG,
231 "found unexpected tag: " + nextTag.getName());
232 return;
233 }
234 }
235 if (socket.isConnected()) {
236 socket.close();
237 }
238 } catch (UnknownHostException e) {
239 this.changeStatus(Account.State.SERVER_NOT_FOUND);
240 if (wakeLock.isHeld()) {
241 try {
242 wakeLock.release();
243 } catch (final RuntimeException ignored) {
244 }
245 }
246 } catch (final IOException | XmlPullParserException e) {
247 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": " + e.getMessage());
248 this.changeStatus(Account.State.OFFLINE);
249 if (wakeLock.isHeld()) {
250 try {
251 wakeLock.release();
252 } catch (final RuntimeException ignored) {
253 }
254 }
255 } catch (NoSuchAlgorithmException e) {
256 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": " + e.getMessage());
257 this.changeStatus(Account.State.OFFLINE);
258 Log.d(Config.LOGTAG, "compression exception " + e.getMessage());
259 if (wakeLock.isHeld()) {
260 try {
261 wakeLock.release();
262 } catch (final RuntimeException ignored) {
263 }
264 }
265 }
266
267 }
268
269 @Override
270 public void run() {
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("compressed")) {
286 switchOverToZLib(nextTag);
287 } else if (nextTag.isStart("success")) {
288 final String challenge = tagReader.readElement(nextTag).getContent();
289 try {
290 saslMechanism.getResponse(challenge);
291 } catch (final SaslMechanism.AuthenticationException e) {
292 disconnect(true);
293 Log.e(Config.LOGTAG, String.valueOf(e));
294 }
295 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": logged in");
296 account.setKey(Account.PINNED_MECHANISM_KEY,
297 String.valueOf(saslMechanism.getPriority()));
298 tagReader.reset();
299 sendStartStream();
300 processStream(tagReader.readTag());
301 break;
302 } else if (nextTag.isStart("failure")) {
303 tagReader.readElement(nextTag);
304 changeStatus(Account.State.UNAUTHORIZED);
305 } else if (nextTag.isStart("challenge")) {
306 final String challenge = tagReader.readElement(nextTag).getContent();
307 final Element response = new Element("response");
308 response.setAttribute("xmlns",
309 "urn:ietf:params:xml:ns:xmpp-sasl");
310 try {
311 response.setContent(saslMechanism.getResponse(challenge));
312 } catch (final SaslMechanism.AuthenticationException e) {
313 // TODO: Send auth abort tag.
314 Log.e(Config.LOGTAG, e.toString());
315 }
316 tagWriter.writeElement(response);
317 } else if (nextTag.isStart("enabled")) {
318 Element enabled = tagReader.readElement(nextTag);
319 if ("true".equals(enabled.getAttribute("resume"))) {
320 this.streamId = enabled.getAttribute("id");
321 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
322 + ": stream managment(" + smVersion
323 + ") enabled (resumable)");
324 } else {
325 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
326 + ": stream managment(" + smVersion + ") enabled");
327 }
328 this.lastSessionStarted = SystemClock.elapsedRealtime();
329 this.stanzasReceived = 0;
330 RequestPacket r = new RequestPacket(smVersion);
331 tagWriter.writeStanzaAsync(r);
332 } else if (nextTag.isStart("resumed")) {
333 lastPaketReceived = SystemClock.elapsedRealtime();
334 Element resumed = tagReader.readElement(nextTag);
335 String h = resumed.getAttribute("h");
336 try {
337 int serverCount = Integer.parseInt(h);
338 if (serverCount != stanzasSent) {
339 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
340 + ": session resumed with lost packages");
341 stanzasSent = serverCount;
342 } else {
343 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
344 + ": session resumed");
345 }
346 if (acknowledgedListener != null) {
347 for (int i = 0; i < messageReceipts.size(); ++i) {
348 if (serverCount >= messageReceipts.keyAt(i)) {
349 acknowledgedListener.onMessageAcknowledged(
350 account, messageReceipts.valueAt(i));
351 }
352 }
353 }
354 messageReceipts.clear();
355 } catch (final NumberFormatException ignored) {
356
357 }
358 sendInitialPing();
359
360 } else if (nextTag.isStart("r")) {
361 tagReader.readElement(nextTag);
362 AckPacket ack = new AckPacket(this.stanzasReceived, smVersion);
363 tagWriter.writeStanzaAsync(ack);
364 } else if (nextTag.isStart("a")) {
365 Element ack = tagReader.readElement(nextTag);
366 lastPaketReceived = SystemClock.elapsedRealtime();
367 int serverSequence = Integer.parseInt(ack.getAttribute("h"));
368 String msgId = this.messageReceipts.get(serverSequence);
369 if (msgId != null) {
370 if (this.acknowledgedListener != null) {
371 this.acknowledgedListener.onMessageAcknowledged(
372 account, msgId);
373 }
374 this.messageReceipts.remove(serverSequence);
375 }
376 } else if (nextTag.isStart("failed")) {
377 tagReader.readElement(nextTag);
378 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": resumption failed");
379 streamId = null;
380 if (account.getStatus() != Account.State.ONLINE) {
381 sendBindRequest();
382 }
383 } else if (nextTag.isStart("iq")) {
384 processIq(nextTag);
385 } else if (nextTag.isStart("message")) {
386 processMessage(nextTag);
387 } else if (nextTag.isStart("presence")) {
388 processPresence(nextTag);
389 }
390 nextTag = tagReader.readTag();
391 }
392 if (account.getStatus() == Account.State.ONLINE) {
393 account. setStatus(Account.State.OFFLINE);
394 if (statusListener != null) {
395 statusListener.onStatusChanged(account);
396 }
397 }
398 }
399
400 private void sendInitialPing() {
401 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": sending intial ping");
402 IqPacket iq = new IqPacket(IqPacket.TYPE_GET);
403 iq.setFrom(account.getJid());
404 iq.addChild("ping", "urn:xmpp:ping");
405 this.sendIqPacket(iq, new OnIqPacketReceived() {
406
407 @Override
408 public void onIqPacketReceived(Account account, IqPacket packet) {
409 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
410 + ": online with resource " + account.getResource());
411 changeStatus(Account.State.ONLINE);
412 }
413 });
414 }
415
416 private Element processPacket(Tag currentTag, int packetType)
417 throws XmlPullParserException, IOException {
418 Element element;
419 switch (packetType) {
420 case PACKET_IQ:
421 element = new IqPacket();
422 break;
423 case PACKET_MESSAGE:
424 element = new MessagePacket();
425 break;
426 case PACKET_PRESENCE:
427 element = new PresencePacket();
428 break;
429 default:
430 return null;
431 }
432 element.setAttributes(currentTag.getAttributes());
433 Tag nextTag = tagReader.readTag();
434 if (nextTag == null) {
435 throw new IOException("interrupted mid tag");
436 }
437 while (!nextTag.isEnd(element.getName())) {
438 if (!nextTag.isNo()) {
439 Element child = tagReader.readElement(nextTag);
440 String type = currentTag.getAttribute("type");
441 if (packetType == PACKET_IQ
442 && "jingle".equals(child.getName())
443 && ("set".equalsIgnoreCase(type) || "get"
444 .equalsIgnoreCase(type))) {
445 element = new JinglePacket();
446 element.setAttributes(currentTag.getAttributes());
447 }
448 element.addChild(child);
449 }
450 nextTag = tagReader.readTag();
451 if (nextTag == null) {
452 throw new IOException("interrupted mid tag");
453 }
454 }
455 ++stanzasReceived;
456 lastPaketReceived = SystemClock.elapsedRealtime();
457 return element;
458 }
459
460 private void processIq(Tag currentTag) throws XmlPullParserException,
461 IOException {
462 IqPacket packet = (IqPacket) processPacket(currentTag, PACKET_IQ);
463
464 if (packet.getId() == null) {
465 return; // an iq packet without id is definitely invalid
466 }
467
468 if (packet instanceof JinglePacket) {
469 if (this.jingleListener != null) {
470 this.jingleListener.onJinglePacketReceived(account,
471 (JinglePacket) packet);
472 }
473 } else {
474 if (packetCallbacks.containsKey(packet.getId())) {
475 if (packetCallbacks.get(packet.getId()) instanceof OnIqPacketReceived) {
476 ((OnIqPacketReceived) packetCallbacks.get(packet.getId()))
477 .onIqPacketReceived(account, packet);
478 }
479
480 packetCallbacks.remove(packet.getId());
481 } else if ((packet.getType() == IqPacket.TYPE_GET || packet
482 .getType() == IqPacket.TYPE_SET)
483 && this.unregisteredIqListener != null) {
484 this.unregisteredIqListener.onIqPacketReceived(account, packet);
485 }
486 }
487 }
488
489 private void processMessage(Tag currentTag) throws XmlPullParserException,
490 IOException {
491 MessagePacket packet = (MessagePacket) processPacket(currentTag,
492 PACKET_MESSAGE);
493 String id = packet.getAttribute("id");
494 if ((id != null) && (packetCallbacks.containsKey(id))) {
495 if (packetCallbacks.get(id) instanceof OnMessagePacketReceived) {
496 ((OnMessagePacketReceived) packetCallbacks.get(id))
497 .onMessagePacketReceived(account, packet);
498 }
499 packetCallbacks.remove(id);
500 } else if (this.messageListener != null) {
501 this.messageListener.onMessagePacketReceived(account, packet);
502 }
503 }
504
505 private void processPresence(Tag currentTag) throws XmlPullParserException,
506 IOException {
507 PresencePacket packet = (PresencePacket) processPacket(currentTag,
508 PACKET_PRESENCE);
509 String id = packet.getAttribute("id");
510 if ((id != null) && (packetCallbacks.containsKey(id))) {
511 if (packetCallbacks.get(id) instanceof OnPresencePacketReceived) {
512 ((OnPresencePacketReceived) packetCallbacks.get(id))
513 .onPresencePacketReceived(account, packet);
514 }
515 packetCallbacks.remove(id);
516 } else if (this.presenceListener != null) {
517 this.presenceListener.onPresencePacketReceived(account, packet);
518 }
519 }
520
521 private void sendCompressionZlib() throws IOException {
522 Element compress = new Element("compress");
523 compress.setAttribute("xmlns", "http://jabber.org/protocol/compress");
524 compress.addChild("method").setContent("zlib");
525 tagWriter.writeElement(compress);
526 }
527
528 private void switchOverToZLib(final Tag currentTag)
529 throws XmlPullParserException, IOException,
530 NoSuchAlgorithmException {
531 tagReader.readTag(); // read tag close
532 tagWriter.setOutputStream(new ZLibOutputStream(tagWriter
533 .getOutputStream()));
534 tagReader
535 .setInputStream(new ZLibInputStream(tagReader.getInputStream()));
536
537 sendStartStream();
538 Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": compression enabled");
539 usingCompression = true;
540 processStream(tagReader.readTag());
541 }
542
543 private void sendStartTLS() throws IOException {
544 Tag startTLS = Tag.empty("starttls");
545 startTLS.setAttribute("xmlns", "urn:ietf:params:xml:ns:xmpp-tls");
546 tagWriter.writeTag(startTLS);
547 }
548
549 private SharedPreferences getPreferences() {
550 return PreferenceManager
551 .getDefaultSharedPreferences(applicationContext);
552 }
553
554 private boolean enableLegacySSL() {
555 return getPreferences().getBoolean("enable_legacy_ssl", false);
556 }
557
558 private void switchOverToTls(final Tag currentTag) throws XmlPullParserException,
559 IOException {
560 tagReader.readTag();
561 try {
562 SSLContext sc = SSLContext.getInstance("TLS");
563 sc.init(null,
564 new X509TrustManager[]{this.mXmppConnectionService.getMemorizingTrustManager()},
565 mXmppConnectionService.getRNG());
566 SSLSocketFactory factory = sc.getSocketFactory();
567
568 if (factory == null) {
569 throw new IOException("SSLSocketFactory was null");
570 }
571
572 final HostnameVerifier verifier = this.mXmppConnectionService.getMemorizingTrustManager().wrapHostnameVerifier(new StrictHostnameVerifier());
573
574 if (socket == null) {
575 throw new IOException("socket was null");
576 }
577 final SSLSocket sslSocket = (SSLSocket) factory.createSocket(socket,
578 socket.getInetAddress().getHostAddress(), socket.getPort(),
579 true);
580
581 // Support all protocols except legacy SSL.
582 // The min SDK version prevents us having to worry about SSLv2. In
583 // future, this may be true of SSLv3 as well.
584 final String[] supportProtocols;
585 if (enableLegacySSL()) {
586 supportProtocols = sslSocket.getSupportedProtocols();
587 } else {
588 final List<String> supportedProtocols = new LinkedList<>(
589 Arrays.asList(sslSocket.getSupportedProtocols()));
590 supportedProtocols.remove("SSLv3");
591 supportProtocols = new String[supportedProtocols.size()];
592 supportedProtocols.toArray(supportProtocols);
593 }
594 sslSocket.setEnabledProtocols(supportProtocols);
595
596 if (verifier != null
597 && !verifier.verify(account.getServer().getDomainpart(),
598 sslSocket.getSession())) {
599 account.setStatus(Account.State.SECURITY_ERROR);
600 sslSocket.close();
601 throw new IOException("Host mismatch in TLS connection");
602 }
603 tagReader.setInputStream(sslSocket.getInputStream());
604 tagWriter.setOutputStream(sslSocket.getOutputStream());
605 sendStartStream();
606 Log.d(Config.LOGTAG, account.getJid().toBareJid()
607 + ": TLS connection established");
608 usingEncryption = true;
609 processStream(tagReader.readTag());
610 sslSocket.close();
611 } catch (final NoSuchAlgorithmException | KeyManagementException e1) {
612 e1.printStackTrace();
613 }
614 }
615
616 private void processStreamFeatures(Tag currentTag)
617 throws XmlPullParserException, IOException {
618 this.streamFeatures = tagReader.readElement(currentTag);
619 if (this.streamFeatures.hasChild("starttls") && !usingEncryption) {
620 sendStartTLS();
621 } else if (compressionAvailable()) {
622 sendCompressionZlib();
623 } else if (this.streamFeatures.hasChild("register")
624 && account.isOptionSet(Account.OPTION_REGISTER)
625 && usingEncryption) {
626 sendRegistryRequest();
627 } else if (!this.streamFeatures.hasChild("register")
628 && account.isOptionSet(Account.OPTION_REGISTER)) {
629 changeStatus(Account.State.REGISTRATION_NOT_SUPPORTED);
630 disconnect(true);
631 } else if (this.streamFeatures.hasChild("mechanisms")
632 && shouldAuthenticate && usingEncryption) {
633 final List<String> mechanisms = extractMechanisms(streamFeatures
634 .findChild("mechanisms"));
635 final Element auth = new Element("auth");
636 auth.setAttribute("xmlns", "urn:ietf:params:xml:ns:xmpp-sasl");
637 if (mechanisms.contains("SCRAM-SHA-1")) {
638 saslMechanism = new ScramSha1(tagWriter, account, mXmppConnectionService.getRNG());
639 } else if (mechanisms.contains("DIGEST-MD5")) {
640 saslMechanism = new DigestMd5(tagWriter, account, mXmppConnectionService.getRNG());
641 } else if (mechanisms.contains("PLAIN")) {
642 saslMechanism = new Plain(tagWriter, account);
643 }
644 final JSONObject keys = account.getKeys();
645 try {
646 if (keys.has(Account.PINNED_MECHANISM_KEY) &&
647 keys.getInt(Account.PINNED_MECHANISM_KEY) > saslMechanism.getPriority() ) {
648 Log.e(Config.LOGTAG, "Auth failed. Authentication mechanism " + saslMechanism.getMechanism() +
649 " has lower priority (" + String.valueOf(saslMechanism.getPriority()) +
650 ") than pinned priority (" + keys.getInt(Account.PINNED_MECHANISM_KEY) +
651 "). Possible downgrade attack?");
652 disconnect(true);
653 account.setStatus(Account.State.SECURITY_ERROR);
654 }
655 } catch (final JSONException e) {
656 Log.d(Config.LOGTAG, "Parse error while checking pinned auth mechanism");
657 }
658 Log.d(Config.LOGTAG, "Authenticating with " + saslMechanism.getMechanism());
659 auth.setAttribute("mechanism", saslMechanism.getMechanism());
660 if (!saslMechanism.getClientFirstMessage().isEmpty()) {
661 auth.setContent(saslMechanism.getClientFirstMessage());
662 }
663 tagWriter.writeElement(auth);
664 } else if (this.streamFeatures.hasChild("sm", "urn:xmpp:sm:"
665 + smVersion)
666 && streamId != null) {
667 ResumePacket resume = new ResumePacket(this.streamId,
668 stanzasReceived, smVersion);
669 this.tagWriter.writeStanzaAsync(resume);
670 } else if (this.streamFeatures.hasChild("bind") && shouldBind) {
671 sendBindRequest();
672 } else {
673 account.setStatus(Account.State.INCOMPATIBLE_SERVER);
674 Log.d(Config.LOGTAG, account.getJid().toBareJid()
675 + ": incompatible server. disconnecting");
676 disconnect(true);
677 }
678 }
679
680 private boolean compressionAvailable() {
681 if (!this.streamFeatures.hasChild("compression",
682 "http://jabber.org/features/compress"))
683 return false;
684 if (!ZLibOutputStream.SUPPORTED)
685 return false;
686 if (!account.isOptionSet(Account.OPTION_USECOMPRESSION))
687 return false;
688
689 Element compression = this.streamFeatures.findChild("compression",
690 "http://jabber.org/features/compress");
691 for (Element child : compression.getChildren()) {
692 if (!"method".equals(child.getName()))
693 continue;
694
695 if ("zlib".equalsIgnoreCase(child.getContent())) {
696 return true;
697 }
698 }
699 return false;
700 }
701
702 private List<String> extractMechanisms(Element stream) {
703 ArrayList<String> mechanisms = new ArrayList<>(stream
704 .getChildren().size());
705 for (Element child : stream.getChildren()) {
706 mechanisms.add(child.getContent());
707 }
708 return mechanisms;
709 }
710
711 private void sendRegistryRequest() {
712 IqPacket register = new IqPacket(IqPacket.TYPE_GET);
713 register.query("jabber:iq:register");
714 register.setTo(account.getServer());
715 sendIqPacket(register, new OnIqPacketReceived() {
716
717 @Override
718 public void onIqPacketReceived(Account account, IqPacket packet) {
719 Element instructions = packet.query().findChild("instructions");
720 if (packet.query().hasChild("username")
721 && (packet.query().hasChild("password"))) {
722 IqPacket register = new IqPacket(IqPacket.TYPE_SET);
723 Element username = new Element("username")
724 .setContent(account.getUsername());
725 Element password = new Element("password")
726 .setContent(account.getPassword());
727 register.query("jabber:iq:register").addChild(username);
728 register.query().addChild(password);
729 sendIqPacket(register, new OnIqPacketReceived() {
730
731 @Override
732 public void onIqPacketReceived(Account account,
733 IqPacket packet) {
734 if (packet.getType() == IqPacket.TYPE_RESULT) {
735 account.setOption(Account.OPTION_REGISTER,
736 false);
737 changeStatus(Account.State.REGISTRATION_SUCCESSFUL);
738 } else if (packet.hasChild("error")
739 && (packet.findChild("error")
740 .hasChild("conflict"))) {
741 changeStatus(Account.State.REGISTRATION_CONFLICT);
742 } else {
743 changeStatus(Account.State.REGISTRATION_FAILED);
744 Log.d(Config.LOGTAG, packet.toString());
745 }
746 disconnect(true);
747 }
748 });
749 } else {
750 changeStatus(Account.State.REGISTRATION_FAILED);
751 disconnect(true);
752 Log.d(Config.LOGTAG, account.getJid().toBareJid()
753 + ": could not register. instructions are"
754 + instructions.getContent());
755 }
756 }
757 });
758 }
759
760 private void sendBindRequest() throws IOException {
761 IqPacket iq = new IqPacket(IqPacket.TYPE_SET);
762 iq.addChild("bind", "urn:ietf:params:xml:ns:xmpp-bind")
763 .addChild("resource").setContent(account.getResource());
764 this.sendUnboundIqPacket(iq, new OnIqPacketReceived() {
765 @Override
766 public void onIqPacketReceived(Account account, IqPacket packet) {
767 Element bind = packet.findChild("bind");
768 if (bind != null) {
769 final Element jid = bind.findChild("jid");
770 if (jid != null && jid.getContent() != null) {
771 try {
772 account.setResource(Jid.fromString(jid.getContent()).getResourcepart());
773 } catch (final InvalidJidException e) {
774 // TODO: Handle the case where an external JID is technically invalid?
775 }
776 if (streamFeatures.hasChild("sm", "urn:xmpp:sm:3")) {
777 smVersion = 3;
778 EnablePacket enable = new EnablePacket(smVersion);
779 tagWriter.writeStanzaAsync(enable);
780 stanzasSent = 0;
781 messageReceipts.clear();
782 } else if (streamFeatures.hasChild("sm",
783 "urn:xmpp:sm:2")) {
784 smVersion = 2;
785 EnablePacket enable = new EnablePacket(smVersion);
786 tagWriter.writeStanzaAsync(enable);
787 stanzasSent = 0;
788 messageReceipts.clear();
789 }
790 sendServiceDiscoveryInfo(account.getServer());
791 sendServiceDiscoveryItems(account.getServer());
792 if (bindListener != null) {
793 bindListener.onBind(account);
794 }
795 sendInitialPing();
796 } else {
797 disconnect(true);
798 }
799 } else {
800 disconnect(true);
801 }
802 }
803 });
804 if (this.streamFeatures.hasChild("session")) {
805 Log.d(Config.LOGTAG, account.getJid().toBareJid()
806 + ": sending deprecated session");
807 IqPacket startSession = new IqPacket(IqPacket.TYPE_SET);
808 startSession.addChild("session",
809 "urn:ietf:params:xml:ns:xmpp-session");
810 this.sendUnboundIqPacket(startSession, null);
811 }
812 }
813
814 private void sendServiceDiscoveryInfo(final Jid server) {
815 final IqPacket iq = new IqPacket(IqPacket.TYPE_GET);
816 iq.setTo(server.toDomainJid());
817 iq.query("http://jabber.org/protocol/disco#info");
818 this.sendIqPacket(iq, new OnIqPacketReceived() {
819
820 @Override
821 public void onIqPacketReceived(Account account, IqPacket packet) {
822 final List<Element> elements = packet.query().getChildren();
823 final List<String> features = new ArrayList<>();
824 for (Element element : elements) {
825 if (element.getName().equals("feature")) {
826 features.add(element.getAttribute("var"));
827 }
828 }
829 disco.put(server.toDomainJid().toString(), features);
830
831 if (account.getServer().equals(server.toDomainJid())) {
832 enableAdvancedStreamFeatures();
833 }
834 }
835 });
836 }
837
838 private void enableAdvancedStreamFeatures() {
839 if (getFeatures().carbons()) {
840 sendEnableCarbons();
841 }
842 }
843
844 private void sendServiceDiscoveryItems(final Jid server) {
845 final IqPacket iq = new IqPacket(IqPacket.TYPE_GET);
846 iq.setTo(server.toDomainJid());
847 iq.query("http://jabber.org/protocol/disco#items");
848 this.sendIqPacket(iq, new OnIqPacketReceived() {
849
850 @Override
851 public void onIqPacketReceived(Account account, IqPacket packet) {
852 List<Element> elements = packet.query().getChildren();
853 for (Element element : elements) {
854 if (element.getName().equals("item")) {
855 final String jid = element.getAttribute("jid");
856 try {
857 sendServiceDiscoveryInfo(Jid.fromString(jid).toDomainJid());
858 } catch (final InvalidJidException ignored) {
859 // TODO: Handle the case where an external JID is technically invalid?
860 }
861 }
862 }
863 }
864 });
865 }
866
867 private void sendEnableCarbons() {
868 IqPacket iq = new IqPacket(IqPacket.TYPE_SET);
869 iq.addChild("enable", "urn:xmpp:carbons:2");
870 this.sendIqPacket(iq, new OnIqPacketReceived() {
871
872 @Override
873 public void onIqPacketReceived(Account account, IqPacket packet) {
874 if (!packet.hasChild("error")) {
875 Log.d(Config.LOGTAG, account.getJid().toBareJid()
876 + ": successfully enabled carbons");
877 } else {
878 Log.d(Config.LOGTAG, account.getJid().toBareJid()
879 + ": error enableing carbons " + packet.toString());
880 }
881 }
882 });
883 }
884
885 private void processStreamError(Tag currentTag)
886 throws XmlPullParserException, IOException {
887 Element streamError = tagReader.readElement(currentTag);
888 if (streamError != null && streamError.hasChild("conflict")) {
889 final String resource = account.getResource().split("\\.")[0];
890 account.setResource(resource + "." + nextRandomId());
891 Log.d(Config.LOGTAG,
892 account.getJid().toBareJid() + ": switching resource due to conflict ("
893 + account.getResource() + ")");
894 }
895 }
896
897 private void sendStartStream() throws IOException {
898 Tag stream = Tag.start("stream:stream");
899 stream.setAttribute("from", account.getJid().toBareJid().toString());
900 stream.setAttribute("to", account.getServer().toString());
901 stream.setAttribute("version", "1.0");
902 stream.setAttribute("xml:lang", "en");
903 stream.setAttribute("xmlns", "jabber:client");
904 stream.setAttribute("xmlns:stream", "http://etherx.jabber.org/streams");
905 tagWriter.writeTag(stream);
906 }
907
908 private String nextRandomId() {
909 return new BigInteger(50, mXmppConnectionService.getRNG()).toString(32);
910 }
911
912 public void sendIqPacket(IqPacket packet, OnIqPacketReceived callback) {
913 if (packet.getId() == null) {
914 String id = nextRandomId();
915 packet.setAttribute("id", id);
916 }
917 packet.setFrom(account.getJid());
918 this.sendPacket(packet, callback);
919 }
920
921 public void sendUnboundIqPacket(IqPacket packet, OnIqPacketReceived callback) {
922 if (packet.getId() == null) {
923 String id = nextRandomId();
924 packet.setAttribute("id", id);
925 }
926 this.sendPacket(packet, callback);
927 }
928
929 public void sendMessagePacket(MessagePacket packet) {
930 this.sendPacket(packet, null);
931 }
932
933 public void sendPresencePacket(PresencePacket packet) {
934 this.sendPacket(packet, null);
935 }
936
937 private synchronized void sendPacket(final AbstractStanza packet,
938 PacketReceived callback) {
939 if (packet.getName().equals("iq") || packet.getName().equals("message")
940 || packet.getName().equals("presence")) {
941 ++stanzasSent;
942 }
943 tagWriter.writeStanzaAsync(packet);
944 if (packet instanceof MessagePacket && packet.getId() != null
945 && this.streamId != null) {
946 Log.d(Config.LOGTAG, "request delivery report for stanza "
947 + stanzasSent);
948 this.messageReceipts.put(stanzasSent, packet.getId());
949 tagWriter.writeStanzaAsync(new RequestPacket(this.smVersion));
950 }
951 if (callback != null) {
952 if (packet.getId() == null) {
953 packet.setId(nextRandomId());
954 }
955 packetCallbacks.put(packet.getId(), callback);
956 }
957 }
958
959 public void sendPing() {
960 if (streamFeatures.hasChild("sm")) {
961 tagWriter.writeStanzaAsync(new RequestPacket(smVersion));
962 } else {
963 IqPacket iq = new IqPacket(IqPacket.TYPE_GET);
964 iq.setFrom(account.getJid());
965 iq.addChild("ping", "urn:xmpp:ping");
966 this.sendIqPacket(iq, null);
967 }
968 this.lastPingSent = SystemClock.elapsedRealtime();
969 }
970
971 public void setOnMessagePacketReceivedListener(
972 OnMessagePacketReceived listener) {
973 this.messageListener = listener;
974 }
975
976 public void setOnUnregisteredIqPacketReceivedListener(
977 OnIqPacketReceived listener) {
978 this.unregisteredIqListener = listener;
979 }
980
981 public void setOnPresencePacketReceivedListener(
982 OnPresencePacketReceived listener) {
983 this.presenceListener = listener;
984 }
985
986 public void setOnJinglePacketReceivedListener(
987 OnJinglePacketReceived listener) {
988 this.jingleListener = listener;
989 }
990
991 public void setOnStatusChangedListener(OnStatusChanged listener) {
992 this.statusListener = listener;
993 }
994
995 public void setOnBindListener(OnBindListener listener) {
996 this.bindListener = listener;
997 }
998
999 public void setOnMessageAcknowledgeListener(OnMessageAcknowledged listener) {
1000 this.acknowledgedListener = listener;
1001 }
1002
1003 public void disconnect(boolean force) {
1004 Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": disconnecting");
1005 try {
1006 if (force) {
1007 socket.close();
1008 return;
1009 }
1010 new Thread(new Runnable() {
1011
1012 @Override
1013 public void run() {
1014 if (tagWriter.isActive()) {
1015 tagWriter.finish();
1016 try {
1017 while (!tagWriter.finished()) {
1018 Log.d(Config.LOGTAG, "not yet finished");
1019 Thread.sleep(100);
1020 }
1021 tagWriter.writeTag(Tag.end("stream:stream"));
1022 socket.close();
1023 } catch (IOException e) {
1024 Log.d(Config.LOGTAG,
1025 "io exception during disconnect");
1026 } catch (InterruptedException e) {
1027 Log.d(Config.LOGTAG, "interrupted");
1028 }
1029 }
1030 }
1031 }).start();
1032 } catch (IOException e) {
1033 Log.d(Config.LOGTAG, "io exception during disconnect");
1034 }
1035 }
1036
1037 public List<String> findDiscoItemsByFeature(String feature) {
1038 final List<String> items = new ArrayList<>();
1039 for (Entry<String, List<String>> cursor : disco.entrySet()) {
1040 if (cursor.getValue().contains(feature)) {
1041 items.add(cursor.getKey());
1042 }
1043 }
1044 return items;
1045 }
1046
1047 public String findDiscoItemByFeature(String feature) {
1048 List<String> items = findDiscoItemsByFeature(feature);
1049 if (items.size() >= 1) {
1050 return items.get(0);
1051 }
1052 return null;
1053 }
1054
1055 public void r() {
1056 this.tagWriter.writeStanzaAsync(new RequestPacket(smVersion));
1057 }
1058
1059 public String getMucServer() {
1060 return findDiscoItemByFeature("http://jabber.org/protocol/muc");
1061 }
1062
1063 public int getTimeToNextAttempt() {
1064 int interval = (int) (25 * Math.pow(1.5, attempt));
1065 int secondsSinceLast = (int) ((SystemClock.elapsedRealtime() - this.lastConnect) / 1000);
1066 return interval - secondsSinceLast;
1067 }
1068
1069 public int getAttempt() {
1070 return this.attempt;
1071 }
1072
1073 public Features getFeatures() {
1074 return this.features;
1075 }
1076
1077 public long getLastSessionEstablished() {
1078 long diff;
1079 if (this.lastSessionStarted == 0) {
1080 diff = SystemClock.elapsedRealtime() - this.lastConnect;
1081 } else {
1082 diff = SystemClock.elapsedRealtime() - this.lastSessionStarted;
1083 }
1084 return System.currentTimeMillis() - diff;
1085 }
1086
1087 public long getLastConnect() {
1088 return this.lastConnect;
1089 }
1090
1091 public long getLastPingSent() {
1092 return this.lastPingSent;
1093 }
1094
1095 public long getLastPacketReceived() {
1096 return this.lastPaketReceived;
1097 }
1098
1099 public void sendActive() {
1100 this.sendPacket(new ActivePacket(), null);
1101 }
1102
1103 public void sendInactive() {
1104 this.sendPacket(new InactivePacket(), null);
1105 }
1106
1107 public class Features {
1108 XmppConnection connection;
1109
1110 public Features(XmppConnection connection) {
1111 this.connection = connection;
1112 }
1113
1114 private boolean hasDiscoFeature(final Jid server, final String feature) {
1115 return connection.disco.containsKey(server.toDomainJid().toString()) &&
1116 connection.disco.get(server.toDomainJid().toString()).contains(feature);
1117 }
1118
1119 public boolean carbons() {
1120 return hasDiscoFeature(account.getServer(), "urn:xmpp:carbons:2");
1121 }
1122
1123 public boolean sm() {
1124 return streamId != null;
1125 }
1126
1127 public boolean csi() {
1128 return connection.streamFeatures != null && connection.streamFeatures.hasChild("csi", "urn:xmpp:csi:0");
1129 }
1130
1131 public boolean pubsub() {
1132 return hasDiscoFeature(account.getServer(),
1133 "http://jabber.org/protocol/pubsub#publish");
1134 }
1135
1136 public boolean mam() {
1137 return hasDiscoFeature(account.getServer(), "urn:xmpp:mam:0");
1138 }
1139
1140 public boolean rosterVersioning() {
1141 return connection.streamFeatures != null && connection.streamFeatures.hasChild("ver");
1142 }
1143
1144 public boolean streamhost() {
1145 return connection
1146 .findDiscoItemByFeature("http://jabber.org/protocol/bytestreams") != null;
1147 }
1148
1149 public boolean compression() {
1150 return connection.usingCompression;
1151 }
1152 }
1153}