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.SocketAddress;
30import java.net.UnknownHostException;
31import java.security.KeyManagementException;
32import java.security.NoSuchAlgorithmException;
33import java.util.ArrayList;
34import java.util.Arrays;
35import java.util.Collection;
36import java.util.HashMap;
37import java.util.Hashtable;
38import java.util.LinkedList;
39import java.util.List;
40import java.util.Map;
41import java.util.Map.Entry;
42
43import javax.net.ssl.HostnameVerifier;
44import javax.net.ssl.SSLContext;
45import javax.net.ssl.SSLSocket;
46import javax.net.ssl.SSLSocketFactory;
47import javax.net.ssl.X509TrustManager;
48
49import eu.siacs.conversations.Config;
50import eu.siacs.conversations.crypto.sasl.DigestMd5;
51import eu.siacs.conversations.crypto.sasl.Plain;
52import eu.siacs.conversations.crypto.sasl.SaslMechanism;
53import eu.siacs.conversations.crypto.sasl.ScramSha1;
54import eu.siacs.conversations.entities.Account;
55import eu.siacs.conversations.generator.IqGenerator;
56import eu.siacs.conversations.services.XmppConnectionService;
57import eu.siacs.conversations.utils.CryptoHelper;
58import eu.siacs.conversations.utils.DNSHelper;
59import eu.siacs.conversations.utils.Xmlns;
60import eu.siacs.conversations.xml.Element;
61import eu.siacs.conversations.xml.Tag;
62import eu.siacs.conversations.xml.TagWriter;
63import eu.siacs.conversations.xml.XmlReader;
64import eu.siacs.conversations.xmpp.jid.InvalidJidException;
65import eu.siacs.conversations.xmpp.jid.Jid;
66import eu.siacs.conversations.xmpp.jingle.OnJinglePacketReceived;
67import eu.siacs.conversations.xmpp.jingle.stanzas.JinglePacket;
68import eu.siacs.conversations.xmpp.stanzas.AbstractStanza;
69import eu.siacs.conversations.xmpp.stanzas.IqPacket;
70import eu.siacs.conversations.xmpp.stanzas.MessagePacket;
71import eu.siacs.conversations.xmpp.stanzas.PresencePacket;
72import eu.siacs.conversations.xmpp.stanzas.csi.ActivePacket;
73import eu.siacs.conversations.xmpp.stanzas.csi.InactivePacket;
74import eu.siacs.conversations.xmpp.stanzas.streammgmt.AckPacket;
75import eu.siacs.conversations.xmpp.stanzas.streammgmt.EnablePacket;
76import eu.siacs.conversations.xmpp.stanzas.streammgmt.RequestPacket;
77import eu.siacs.conversations.xmpp.stanzas.streammgmt.ResumePacket;
78
79public class XmppConnection implements Runnable {
80
81 private static final int PACKET_IQ = 0;
82 private static final int PACKET_MESSAGE = 1;
83 private static final int PACKET_PRESENCE = 2;
84 private final Context applicationContext;
85 protected Account account;
86 private final WakeLock wakeLock;
87 private Socket socket;
88 private XmlReader tagReader;
89 private TagWriter tagWriter;
90 private final Features features = new Features(this);
91 private boolean shouldBind = true;
92 private boolean shouldAuthenticate = true;
93 private Element streamFeatures;
94 private final HashMap<Jid, Info> disco = new HashMap<>();
95
96 private String streamId = null;
97 private int smVersion = 3;
98 private final SparseArray<String> messageReceipts = new SparseArray<>();
99
100 private int stanzasReceived = 0;
101 private int stanzasSent = 0;
102 private long lastPacketReceived = 0;
103 private long lastPingSent = 0;
104 private long lastConnect = 0;
105 private long lastSessionStarted = 0;
106 private int attempt = 0;
107 private final Map<String, Pair<IqPacket, OnIqPacketReceived>> packetCallbacks = new Hashtable<>();
108 private OnPresencePacketReceived presenceListener = null;
109 private OnJinglePacketReceived jingleListener = null;
110 private OnIqPacketReceived unregisteredIqListener = null;
111 private OnMessagePacketReceived messageListener = null;
112 private OnStatusChanged statusListener = null;
113 private OnBindListener bindListener = null;
114 private final ArrayList<OnAdvancedStreamFeaturesLoaded> advancedStreamFeaturesLoadedListeners = new ArrayList<>();
115 private OnMessageAcknowledged acknowledgedListener = null;
116 private XmppConnectionService mXmppConnectionService = null;
117
118 private SaslMechanism saslMechanism;
119
120 public XmppConnection(final Account account, final XmppConnectionService service) {
121 this.account = account;
122 this.wakeLock = service.getPowerManager().newWakeLock(
123 PowerManager.PARTIAL_WAKE_LOCK, account.getJid().toBareJid().toString());
124 tagWriter = new TagWriter();
125 mXmppConnectionService = service;
126 applicationContext = service.getApplicationContext();
127 }
128
129 protected void changeStatus(final Account.State nextStatus) {
130 if (account.getStatus() != nextStatus) {
131 if ((nextStatus == Account.State.OFFLINE)
132 && (account.getStatus() != Account.State.CONNECTING)
133 && (account.getStatus() != Account.State.ONLINE)
134 && (account.getStatus() != Account.State.DISABLED)) {
135 return;
136 }
137 if (nextStatus == Account.State.ONLINE) {
138 this.attempt = 0;
139 }
140 account.setStatus(nextStatus);
141 if (statusListener != null) {
142 statusListener.onStatusChanged(account);
143 }
144 }
145 }
146
147 protected void connect() {
148 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": connecting");
149 features.encryptionEnabled = false;
150 lastConnect = SystemClock.elapsedRealtime();
151 lastPingSent = SystemClock.elapsedRealtime();
152 this.attempt++;
153 try {
154 shouldAuthenticate = shouldBind = !account.isOptionSet(Account.OPTION_REGISTER);
155 tagReader = new XmlReader(wakeLock);
156 tagWriter = new TagWriter();
157 packetCallbacks.clear();
158 this.changeStatus(Account.State.CONNECTING);
159 if (DNSHelper.isIp(account.getServer().toString())) {
160 socket = new Socket();
161 try {
162 socket.connect(new InetSocketAddress(account.getServer().toString(), 5222), Config.SOCKET_TIMEOUT * 1000);
163 } catch (IOException e) {
164 throw new UnknownHostException();
165 }
166 } else {
167 final Bundle result = DNSHelper.getSRVRecord(account.getServer());
168 final ArrayList<Parcelable> values = result.getParcelableArrayList("values");
169 if ("timeout".equals(result.getString("error"))) {
170 throw new IOException("timeout in dns");
171 } else if (values != null) {
172 int i = 0;
173 boolean socketError = true;
174 while (socketError && values.size() > i) {
175 final Bundle namePort = (Bundle) values.get(i);
176 try {
177 String srvRecordServer;
178 try {
179 srvRecordServer = IDN.toASCII(namePort.getString("name"));
180 } catch (final IllegalArgumentException e) {
181 // TODO: Handle me?`
182 srvRecordServer = "";
183 }
184 final int srvRecordPort = namePort.getInt("port");
185 final String srvIpServer = namePort.getString("ip");
186 final InetSocketAddress addr;
187 if (srvIpServer != null) {
188 addr = new InetSocketAddress(srvIpServer, srvRecordPort);
189 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
190 + ": using values from dns " + srvRecordServer
191 + "[" + srvIpServer + "]:" + srvRecordPort);
192 } else {
193 addr = new InetSocketAddress(srvRecordServer, srvRecordPort);
194 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
195 + ": using values from dns "
196 + srvRecordServer + ":" + srvRecordPort);
197 }
198 socket = new Socket();
199 socket.connect(addr, Config.SOCKET_TIMEOUT * 1000);
200 socketError = false;
201 } catch (final UnknownHostException e) {
202 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": " + e.getMessage());
203 i++;
204 } catch (final IOException e) {
205 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": " + e.getMessage());
206 i++;
207 }
208 }
209 if (socketError) {
210 throw new UnknownHostException();
211 }
212 } else {
213 throw new IOException("unhandled exception in DNS resolver");
214 }
215 }
216 final OutputStream out = socket.getOutputStream();
217 tagWriter.setOutputStream(out);
218 final InputStream in = socket.getInputStream();
219 tagReader.setInputStream(in);
220 tagWriter.beginDocument();
221 sendStartStream();
222 Tag nextTag;
223 while ((nextTag = tagReader.readTag()) != null) {
224 if (nextTag.isStart("stream")) {
225 processStream(nextTag);
226 break;
227 } else {
228 throw new IOException("unknown tag on connect");
229 }
230 }
231 if (socket.isConnected()) {
232 socket.close();
233 }
234 } catch (final IncompatibleServerException e) {
235 this.changeStatus(Account.State.INCOMPATIBLE_SERVER);
236 } catch (final SecurityException e) {
237 this.changeStatus(Account.State.SECURITY_ERROR);
238 } catch (final UnauthorizedException e) {
239 this.changeStatus(Account.State.UNAUTHORIZED);
240 } catch (final UnknownHostException | ConnectException e) {
241 this.changeStatus(Account.State.SERVER_NOT_FOUND);
242 } catch (final IOException | XmlPullParserException | NoSuchAlgorithmException e) {
243 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": " + e.getMessage());
244 this.changeStatus(Account.State.OFFLINE);
245 this.attempt--; //don't count attempt when reconnecting instantly anyway
246 } finally {
247 if (socket != null) {
248 try {
249 socket.close();
250 } catch (IOException e) {
251
252 }
253 }
254 if (wakeLock.isHeld()) {
255 try {
256 wakeLock.release();
257 } catch (final RuntimeException ignored) {
258 }
259 }
260 }
261 }
262
263 @Override
264 public void run() {
265 try {
266 if (socket != null) {
267 socket.close();
268 }
269 } catch (final IOException ignored) {
270
271 }
272 connect();
273 }
274
275 private void processStream(final Tag currentTag) throws XmlPullParserException,
276 IOException, NoSuchAlgorithmException {
277 Tag nextTag = tagReader.readTag();
278
279 while ((nextTag != null) && (!nextTag.isEnd("stream"))) {
280 if (nextTag.isStart("error")) {
281 processStreamError(nextTag);
282 } else if (nextTag.isStart("features")) {
283 processStreamFeatures(nextTag);
284 } else if (nextTag.isStart("proceed")) {
285 switchOverToTls(nextTag);
286 } else if (nextTag.isStart("success")) {
287 final String challenge = tagReader.readElement(nextTag).getContent();
288 try {
289 saslMechanism.getResponse(challenge);
290 } catch (final SaslMechanism.AuthenticationException e) {
291 disconnect(true);
292 Log.e(Config.LOGTAG, String.valueOf(e));
293 }
294 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": logged in");
295 account.setKey(Account.PINNED_MECHANISM_KEY,
296 String.valueOf(saslMechanism.getPriority()));
297 tagReader.reset();
298 sendStartStream();
299 processStream(tagReader.readTag());
300 break;
301 } else if (nextTag.isStart("failure")) {
302 throw new UnauthorizedException();
303 } else if (nextTag.isStart("challenge")) {
304 final String challenge = tagReader.readElement(nextTag).getContent();
305 final Element response = new Element("response");
306 response.setAttribute("xmlns",
307 "urn:ietf:params:xml:ns:xmpp-sasl");
308 try {
309 response.setContent(saslMechanism.getResponse(challenge));
310 } catch (final SaslMechanism.AuthenticationException e) {
311 // TODO: Send auth abort tag.
312 Log.e(Config.LOGTAG, e.toString());
313 }
314 tagWriter.writeElement(response);
315 } else if (nextTag.isStart("enabled")) {
316 final Element enabled = tagReader.readElement(nextTag);
317 if ("true".equals(enabled.getAttribute("resume"))) {
318 this.streamId = enabled.getAttribute("id");
319 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
320 + ": stream managment(" + smVersion
321 + ") enabled (resumable)");
322 } else {
323 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
324 + ": stream managment(" + smVersion + ") enabled");
325 }
326 this.lastSessionStarted = SystemClock.elapsedRealtime();
327 this.stanzasReceived = 0;
328 final RequestPacket r = new RequestPacket(smVersion);
329 tagWriter.writeStanzaAsync(r);
330 } else if (nextTag.isStart("resumed")) {
331 lastPacketReceived = SystemClock.elapsedRealtime();
332 final Element resumed = tagReader.readElement(nextTag);
333 final String h = resumed.getAttribute("h");
334 try {
335 final int serverCount = Integer.parseInt(h);
336 if (serverCount != stanzasSent) {
337 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
338 + ": session resumed with lost packages");
339 stanzasSent = serverCount;
340 } else {
341 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
342 + ": session resumed");
343 }
344 if (acknowledgedListener != null) {
345 for (int i = 0; i < messageReceipts.size(); ++i) {
346 if (serverCount >= messageReceipts.keyAt(i)) {
347 acknowledgedListener.onMessageAcknowledged(
348 account, messageReceipts.valueAt(i));
349 }
350 }
351 }
352 messageReceipts.clear();
353 } catch (final NumberFormatException ignored) {
354 }
355 sendServiceDiscoveryInfo(account.getServer());
356 sendServiceDiscoveryInfo(account.getJid().toBareJid());
357 sendServiceDiscoveryItems(account.getServer());
358 sendInitialPing();
359 } else if (nextTag.isStart("r")) {
360 tagReader.readElement(nextTag);
361 if (Config.EXTENDED_SM_LOGGING) {
362 Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": acknowledging stanza #" + this.stanzasReceived);
363 }
364 final AckPacket ack = new AckPacket(this.stanzasReceived, smVersion);
365 tagWriter.writeStanzaAsync(ack);
366 } else if (nextTag.isStart("a")) {
367 final Element ack = tagReader.readElement(nextTag);
368 lastPacketReceived = SystemClock.elapsedRealtime();
369 try {
370 final int serverSequence = Integer.parseInt(ack.getAttribute("h"));
371 if (Config.EXTENDED_SM_LOGGING) {
372 Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": server acknowledged stanza #" + serverSequence);
373 }
374 final String msgId = this.messageReceipts.get(serverSequence);
375 if (msgId != null) {
376 if (this.acknowledgedListener != null) {
377 this.acknowledgedListener.onMessageAcknowledged(
378 account, msgId);
379 }
380 this.messageReceipts.remove(serverSequence);
381 }
382 } catch (NumberFormatException e) {
383 Log.d(Config.LOGTAG,account.getJid().toBareJid()+": server send ack without sequence number");
384 }
385 } else if (nextTag.isStart("failed")) {
386 tagReader.readElement(nextTag);
387 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": resumption failed");
388 streamId = null;
389 if (account.getStatus() != Account.State.ONLINE) {
390 sendBindRequest();
391 }
392 } else if (nextTag.isStart("iq")) {
393 processIq(nextTag);
394 } else if (nextTag.isStart("message")) {
395 processMessage(nextTag);
396 } else if (nextTag.isStart("presence")) {
397 processPresence(nextTag);
398 }
399 nextTag = tagReader.readTag();
400 }
401 if (account.getStatus() == Account.State.ONLINE) {
402 account. setStatus(Account.State.OFFLINE);
403 if (statusListener != null) {
404 statusListener.onStatusChanged(account);
405 }
406 }
407 }
408
409 private void sendInitialPing() {
410 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": sending intial ping");
411 final IqPacket iq = new IqPacket(IqPacket.TYPE.GET);
412 iq.setFrom(account.getJid());
413 iq.addChild("ping", "urn:xmpp:ping");
414 this.sendIqPacket(iq, new OnIqPacketReceived() {
415 @Override
416 public void onIqPacketReceived(final Account account, final IqPacket packet) {
417 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
418 + ": online with resource " + account.getResource());
419 changeStatus(Account.State.ONLINE);
420 }
421 });
422 }
423
424 private Element processPacket(final Tag currentTag, final int packetType)
425 throws XmlPullParserException, IOException {
426 Element element;
427 switch (packetType) {
428 case PACKET_IQ:
429 element = new IqPacket();
430 break;
431 case PACKET_MESSAGE:
432 element = new MessagePacket();
433 break;
434 case PACKET_PRESENCE:
435 element = new PresencePacket();
436 break;
437 default:
438 return null;
439 }
440 element.setAttributes(currentTag.getAttributes());
441 Tag nextTag = tagReader.readTag();
442 if (nextTag == null) {
443 throw new IOException("interrupted mid tag");
444 }
445 while (!nextTag.isEnd(element.getName())) {
446 if (!nextTag.isNo()) {
447 final Element child = tagReader.readElement(nextTag);
448 final String type = currentTag.getAttribute("type");
449 if (packetType == PACKET_IQ
450 && "jingle".equals(child.getName())
451 && ("set".equalsIgnoreCase(type) || "get"
452 .equalsIgnoreCase(type))) {
453 element = new JinglePacket();
454 element.setAttributes(currentTag.getAttributes());
455 }
456 element.addChild(child);
457 }
458 nextTag = tagReader.readTag();
459 if (nextTag == null) {
460 throw new IOException("interrupted mid tag");
461 }
462 }
463 if (stanzasReceived == Integer.MAX_VALUE) {
464 resetStreamId();
465 throw new IOException("time to restart the session. cant handle >2 billion pcks");
466 }
467 ++stanzasReceived;
468 lastPacketReceived = SystemClock.elapsedRealtime();
469 return element;
470 }
471
472 private void processIq(final Tag currentTag) throws XmlPullParserException, IOException {
473 final IqPacket packet = (IqPacket) processPacket(currentTag, PACKET_IQ);
474
475 if (packet.getId() == null) {
476 return; // an iq packet without id is definitely invalid
477 }
478
479 if (packet instanceof JinglePacket) {
480 if (this.jingleListener != null) {
481 this.jingleListener.onJinglePacketReceived(account,(JinglePacket) packet);
482 }
483 } else {
484 if (packetCallbacks.containsKey(packet.getId())) {
485 final Pair<IqPacket, OnIqPacketReceived> packetCallbackDuple = packetCallbacks.get(packet.getId());
486 // Packets to the server should have responses from the server
487 if (packetCallbackDuple.first.toServer(account)) {
488 if (packet.fromServer(account)) {
489 packetCallbackDuple.second.onIqPacketReceived(account, packet);
490 packetCallbacks.remove(packet.getId());
491 } else {
492 Log.e(Config.LOGTAG,account.getJid().toBareJid().toString()+": ignoring spoofed iq packet");
493 }
494 } else {
495 if (packet.getFrom().equals(packetCallbackDuple.first.getTo())) {
496 packetCallbackDuple.second.onIqPacketReceived(account, packet);
497 packetCallbacks.remove(packet.getId());
498 } else {
499 Log.e(Config.LOGTAG,account.getJid().toBareJid().toString()+": ignoring spoofed iq packet");
500 }
501 }
502 } else if (packet.getType() == IqPacket.TYPE.GET|| packet.getType() == IqPacket.TYPE.SET) {
503 this.unregisteredIqListener.onIqPacketReceived(account, packet);
504 }
505 }
506 }
507
508 private void processMessage(final Tag currentTag) throws XmlPullParserException, IOException {
509 final MessagePacket packet = (MessagePacket) processPacket(currentTag,PACKET_MESSAGE);
510 this.messageListener.onMessagePacketReceived(account, packet);
511 }
512
513 private void processPresence(final Tag currentTag) throws XmlPullParserException, IOException {
514 PresencePacket packet = (PresencePacket) processPacket(currentTag, PACKET_PRESENCE);
515 this.presenceListener.onPresencePacketReceived(account, packet);
516 }
517
518 private void sendStartTLS() throws IOException {
519 final Tag startTLS = Tag.empty("starttls");
520 startTLS.setAttribute("xmlns", "urn:ietf:params:xml:ns:xmpp-tls");
521 tagWriter.writeTag(startTLS);
522 }
523
524 private SharedPreferences getPreferences() {
525 return PreferenceManager.getDefaultSharedPreferences(applicationContext);
526 }
527
528 private boolean enableLegacySSL() {
529 return getPreferences().getBoolean("enable_legacy_ssl", false);
530 }
531
532 private void switchOverToTls(final Tag currentTag) throws XmlPullParserException, IOException {
533 tagReader.readTag();
534 try {
535 final SSLContext sc = SSLContext.getInstance("TLS");
536 sc.init(null,new X509TrustManager[]{this.mXmppConnectionService.getMemorizingTrustManager()},mXmppConnectionService.getRNG());
537 final SSLSocketFactory factory = sc.getSocketFactory();
538 final HostnameVerifier verifier = this.mXmppConnectionService.getMemorizingTrustManager().wrapHostnameVerifier(new StrictHostnameVerifier());
539 final InetAddress address = socket == null ? null : socket.getInetAddress();
540
541 if (factory == null || address == null || verifier == null) {
542 throw new IOException("could not setup ssl");
543 }
544
545 final SSLSocket sslSocket = (SSLSocket) factory.createSocket(socket,address.getHostAddress(), socket.getPort(),true);
546
547 if (sslSocket == null) {
548 throw new IOException("could not initialize ssl socket");
549 }
550
551 final String[] supportProtocols;
552 final Collection<String> supportedProtocols = new LinkedList<>(
553 Arrays.asList(sslSocket.getSupportedProtocols()));
554 supportedProtocols.remove("SSLv3");
555 supportProtocols = supportedProtocols.toArray(new String[supportedProtocols.size()]);
556
557 sslSocket.setEnabledProtocols(supportProtocols);
558
559 final String[] cipherSuites = CryptoHelper.getOrderedCipherSuites(
560 sslSocket.getSupportedCipherSuites());
561 //Log.d(Config.LOGTAG, "Using ciphers: " + Arrays.toString(cipherSuites));
562 if (cipherSuites.length > 0) {
563 sslSocket.setEnabledCipherSuites(cipherSuites);
564 }
565
566 if (!verifier.verify(account.getServer().getDomainpart(),sslSocket.getSession())) {
567 Log.d(Config.LOGTAG,account.getJid().toBareJid()+": TLS certificate verification failed");
568 throw new SecurityException();
569 }
570 tagReader.setInputStream(sslSocket.getInputStream());
571 tagWriter.setOutputStream(sslSocket.getOutputStream());
572 sendStartStream();
573 Log.d(Config.LOGTAG, account.getJid().toBareJid()+ ": TLS connection established");
574 features.encryptionEnabled = true;
575 processStream(tagReader.readTag());
576 sslSocket.close();
577 } catch (final NoSuchAlgorithmException | KeyManagementException e1) {
578 Log.d(Config.LOGTAG,account.getJid().toBareJid()+": TLS certificate verification failed");
579 throw new SecurityException();
580 }
581 }
582
583 private void processStreamFeatures(final Tag currentTag)
584 throws XmlPullParserException, IOException {
585 this.streamFeatures = tagReader.readElement(currentTag);
586 if (this.streamFeatures.hasChild("starttls") && !features.encryptionEnabled) {
587 sendStartTLS();
588 } else if (this.streamFeatures.hasChild("register")
589 && account.isOptionSet(Account.OPTION_REGISTER)
590 && features.encryptionEnabled) {
591 sendRegistryRequest();
592 } else if (!this.streamFeatures.hasChild("register")
593 && account.isOptionSet(Account.OPTION_REGISTER)) {
594 changeStatus(Account.State.REGISTRATION_NOT_SUPPORTED);
595 disconnect(true);
596 } else if (this.streamFeatures.hasChild("mechanisms")
597 && shouldAuthenticate && features.encryptionEnabled) {
598 final List<String> mechanisms = extractMechanisms(streamFeatures
599 .findChild("mechanisms"));
600 final Element auth = new Element("auth");
601 auth.setAttribute("xmlns", "urn:ietf:params:xml:ns:xmpp-sasl");
602 if (mechanisms.contains("SCRAM-SHA-1")) {
603 saslMechanism = new ScramSha1(tagWriter, account, mXmppConnectionService.getRNG());
604 } else if (mechanisms.contains("PLAIN")) {
605 saslMechanism = new Plain(tagWriter, account);
606 } else if (mechanisms.contains("DIGEST-MD5")) {
607 saslMechanism = new DigestMd5(tagWriter, account, mXmppConnectionService.getRNG());
608 }
609 if (saslMechanism != null) {
610 final JSONObject keys = account.getKeys();
611 try {
612 if (keys.has(Account.PINNED_MECHANISM_KEY) &&
613 keys.getInt(Account.PINNED_MECHANISM_KEY) > saslMechanism.getPriority()) {
614 Log.e(Config.LOGTAG, "Auth failed. Authentication mechanism " + saslMechanism.getMechanism() +
615 " has lower priority (" + String.valueOf(saslMechanism.getPriority()) +
616 ") than pinned priority (" + keys.getInt(Account.PINNED_MECHANISM_KEY) +
617 "). Possible downgrade attack?");
618 throw new SecurityException();
619 }
620 } catch (final JSONException e) {
621 Log.d(Config.LOGTAG, "Parse error while checking pinned auth mechanism");
622 }
623 Log.d(Config.LOGTAG, account.getJid().toString() + ": Authenticating with " + saslMechanism.getMechanism());
624 auth.setAttribute("mechanism", saslMechanism.getMechanism());
625 if (!saslMechanism.getClientFirstMessage().isEmpty()) {
626 auth.setContent(saslMechanism.getClientFirstMessage());
627 }
628 tagWriter.writeElement(auth);
629 } else {
630 throw new IncompatibleServerException();
631 }
632 } else if (this.streamFeatures.hasChild("sm", "urn:xmpp:sm:"
633 + smVersion)
634 && streamId != null) {
635 if (Config.EXTENDED_SM_LOGGING) {
636 Log.d(Config.LOGTAG,account.getJid().toBareJid()+": resuming after stanza #"+stanzasReceived);
637 }
638 final ResumePacket resume = new ResumePacket(this.streamId, stanzasReceived, smVersion);
639 this.tagWriter.writeStanzaAsync(resume);
640 } else if (this.streamFeatures.hasChild("bind") && shouldBind) {
641 sendBindRequest();
642 } else {
643 disconnect(true);
644 changeStatus(Account.State.INCOMPATIBLE_SERVER);
645 }
646 }
647
648 private List<String> extractMechanisms(final Element stream) {
649 final ArrayList<String> mechanisms = new ArrayList<>(stream
650 .getChildren().size());
651 for (final Element child : stream.getChildren()) {
652 mechanisms.add(child.getContent());
653 }
654 return mechanisms;
655 }
656
657 private void sendRegistryRequest() {
658 final IqPacket register = new IqPacket(IqPacket.TYPE.GET);
659 register.query("jabber:iq:register");
660 register.setTo(account.getServer());
661 sendIqPacket(register, new OnIqPacketReceived() {
662
663 @Override
664 public void onIqPacketReceived(final Account account, final IqPacket packet) {
665 final Element instructions = packet.query().findChild("instructions");
666 if (packet.query().hasChild("username")
667 && (packet.query().hasChild("password"))) {
668 final IqPacket register = new IqPacket(IqPacket.TYPE.SET);
669 final Element username = new Element("username").setContent(account.getUsername());
670 final Element password = new Element("password").setContent(account.getPassword());
671 register.query("jabber:iq:register").addChild(username);
672 register.query().addChild(password);
673 sendIqPacket(register, new OnIqPacketReceived() {
674
675 @Override
676 public void onIqPacketReceived(final Account account, final IqPacket packet) {
677 if (packet.getType() == IqPacket.TYPE.RESULT) {
678 account.setOption(Account.OPTION_REGISTER,
679 false);
680 changeStatus(Account.State.REGISTRATION_SUCCESSFUL);
681 } else if (packet.hasChild("error")
682 && (packet.findChild("error")
683 .hasChild("conflict"))) {
684 changeStatus(Account.State.REGISTRATION_CONFLICT);
685 } else {
686 changeStatus(Account.State.REGISTRATION_FAILED);
687 Log.d(Config.LOGTAG, packet.toString());
688 }
689 disconnect(true);
690 }
691 });
692 } else {
693 changeStatus(Account.State.REGISTRATION_FAILED);
694 disconnect(true);
695 Log.d(Config.LOGTAG, account.getJid().toBareJid()
696 + ": could not register. instructions are"
697 + (instructions != null ? instructions.getContent() : ""));
698 }
699 }
700 });
701 }
702
703 private void sendBindRequest() {
704 while(!mXmppConnectionService.areMessagesInitialized()) {
705 try {
706 Thread.sleep(500);
707 } catch (final InterruptedException ignored) {
708 }
709 }
710 final IqPacket iq = new IqPacket(IqPacket.TYPE.SET);
711 iq.addChild("bind", "urn:ietf:params:xml:ns:xmpp-bind")
712 .addChild("resource").setContent(account.getResource());
713 this.sendUnmodifiedIqPacket(iq, new OnIqPacketReceived() {
714 @Override
715 public void onIqPacketReceived(final Account account, final IqPacket packet) {
716 final Element bind = packet.findChild("bind");
717 if (bind != null) {
718 final Element jid = bind.findChild("jid");
719 if (jid != null && jid.getContent() != null) {
720 try {
721 account.setResource(Jid.fromString(jid.getContent()).getResourcepart());
722 } catch (final InvalidJidException e) {
723 // TODO: Handle the case where an external JID is technically invalid?
724 }
725 if (streamFeatures.hasChild("session")) {
726 sendStartSession();
727 } else {
728 sendPostBindInitialization();
729 }
730 } else {
731 disconnect(true);
732 }
733 } else {
734 disconnect(true);
735 }
736 }
737 });
738 }
739
740 private void sendStartSession() {
741 final IqPacket startSession = new IqPacket(IqPacket.TYPE.SET);
742 startSession.addChild("session","urn:ietf:params:xml:ns:xmpp-session");
743 this.sendUnmodifiedIqPacket(startSession, new OnIqPacketReceived() {
744 @Override
745 public void onIqPacketReceived(Account account, IqPacket packet) {
746 if (packet.getType() == IqPacket.TYPE.RESULT) {
747 sendPostBindInitialization();
748 } else {
749 disconnect(true);
750 }
751 }
752 });
753 }
754
755 private void sendPostBindInitialization() {
756 smVersion = 0;
757 if (streamFeatures.hasChild("sm", "urn:xmpp:sm:3")) {
758 smVersion = 3;
759 } else if (streamFeatures.hasChild("sm", "urn:xmpp:sm:2")) {
760 smVersion = 2;
761 }
762 if (smVersion != 0) {
763 final EnablePacket enable = new EnablePacket(smVersion);
764 tagWriter.writeStanzaAsync(enable);
765 stanzasSent = 0;
766 messageReceipts.clear();
767 }
768 features.carbonsEnabled = false;
769 features.blockListRequested = false;
770 disco.clear();
771 sendServiceDiscoveryInfo(account.getServer());
772 sendServiceDiscoveryInfo(account.getJid().toBareJid());
773 sendServiceDiscoveryItems(account.getServer());
774 if (bindListener != null) {
775 bindListener.onBind(account);
776 }
777 sendInitialPing();
778 }
779
780 private void sendServiceDiscoveryInfo(final Jid jid) {
781 if (disco.containsKey(jid)) {
782 if (account.getServer().equals(jid)) {
783 enableAdvancedStreamFeatures();
784 }
785 } else {
786 final IqPacket iq = new IqPacket(IqPacket.TYPE.GET);
787 iq.setTo(jid);
788 iq.query("http://jabber.org/protocol/disco#info");
789 this.sendIqPacket(iq, new OnIqPacketReceived() {
790
791 @Override
792 public void onIqPacketReceived(final Account account, final IqPacket packet) {
793 final List<Element> elements = packet.query().getChildren();
794 final Info info = new Info();
795 for (final Element element : elements) {
796 if (element.getName().equals("identity")) {
797 String type = element.getAttribute("type");
798 String category = element.getAttribute("category");
799 if (type != null && category != null) {
800 info.identities.add(new Pair<>(category,type));
801 }
802 } else if (element.getName().equals("feature")) {
803 info.features.add(element.getAttribute("var"));
804 }
805 }
806 disco.put(jid, info);
807
808 if (account.getServer().equals(jid)) {
809 enableAdvancedStreamFeatures();
810 for (final OnAdvancedStreamFeaturesLoaded listener : advancedStreamFeaturesLoadedListeners) {
811 listener.onAdvancedStreamFeaturesAvailable(account);
812 }
813 }
814 }
815 });
816 }
817 }
818
819 private void enableAdvancedStreamFeatures() {
820 if (getFeatures().carbons() && !features.carbonsEnabled) {
821 sendEnableCarbons();
822 }
823 if (getFeatures().blocking() && !features.blockListRequested) {
824 Log.d(Config.LOGTAG,account.getJid().toBareJid()+": Requesting block list");
825 this.sendIqPacket(getIqGenerator().generateGetBlockList(), mXmppConnectionService.getIqParser());
826 }
827 }
828
829 private void sendServiceDiscoveryItems(final Jid server) {
830 final IqPacket iq = new IqPacket(IqPacket.TYPE.GET);
831 iq.setTo(server.toDomainJid());
832 iq.query("http://jabber.org/protocol/disco#items");
833 this.sendIqPacket(iq, new OnIqPacketReceived() {
834
835 @Override
836 public void onIqPacketReceived(final Account account, final IqPacket packet) {
837 final List<Element> elements = packet.query().getChildren();
838 for (final Element element : elements) {
839 if (element.getName().equals("item")) {
840 final Jid jid = element.getAttributeAsJid("jid");
841 if (jid != null && !jid.equals(account.getServer())) {
842 sendServiceDiscoveryInfo(jid);
843 }
844 }
845 }
846 }
847 });
848 }
849
850 private void sendEnableCarbons() {
851 final IqPacket iq = new IqPacket(IqPacket.TYPE.SET);
852 iq.addChild("enable", "urn:xmpp:carbons:2");
853 this.sendIqPacket(iq, new OnIqPacketReceived() {
854
855 @Override
856 public void onIqPacketReceived(final Account account, final IqPacket packet) {
857 if (!packet.hasChild("error")) {
858 Log.d(Config.LOGTAG, account.getJid().toBareJid()
859 + ": successfully enabled carbons");
860 features.carbonsEnabled = true;
861 } else {
862 Log.d(Config.LOGTAG, account.getJid().toBareJid()
863 + ": error enableing carbons " + packet.toString());
864 }
865 }
866 });
867 }
868
869 private void processStreamError(final Tag currentTag)
870 throws XmlPullParserException, IOException {
871 final Element streamError = tagReader.readElement(currentTag);
872 if (streamError != null && streamError.hasChild("conflict")) {
873 final String resource = account.getResource().split("\\.")[0];
874 account.setResource(resource + "." + nextRandomId());
875 Log.d(Config.LOGTAG,
876 account.getJid().toBareJid() + ": switching resource due to conflict ("
877 + account.getResource() + ")");
878 }
879 }
880
881 private void sendStartStream() throws IOException {
882 final Tag stream = Tag.start("stream:stream");
883 stream.setAttribute("from", account.getJid().toBareJid().toString());
884 stream.setAttribute("to", account.getServer().toString());
885 stream.setAttribute("version", "1.0");
886 stream.setAttribute("xml:lang", "en");
887 stream.setAttribute("xmlns", "jabber:client");
888 stream.setAttribute("xmlns:stream", "http://etherx.jabber.org/streams");
889 tagWriter.writeTag(stream);
890 }
891
892 private String nextRandomId() {
893 return new BigInteger(50, mXmppConnectionService.getRNG()).toString(32);
894 }
895
896 public void sendIqPacket(final IqPacket packet, final OnIqPacketReceived callback) {
897 packet.setFrom(account.getJid());
898 this.sendUnmodifiedIqPacket(packet,callback);
899
900 }
901
902 private synchronized void sendUnmodifiedIqPacket(final IqPacket packet, final OnIqPacketReceived callback) {
903 if (packet.getId() == null) {
904 final String id = nextRandomId();
905 packet.setAttribute("id", id);
906 }
907 if (callback != null) {
908 if (packet.getId() == null) {
909 packet.setId(nextRandomId());
910 }
911 packetCallbacks.put(packet.getId(), new Pair<>(packet, callback));
912 }
913 this.sendPacket(packet);
914 }
915
916 public void sendMessagePacket(final MessagePacket packet) {
917 this.sendPacket(packet);
918 }
919
920 public void sendPresencePacket(final PresencePacket packet) {
921 this.sendPacket(packet);
922 }
923
924 private synchronized void sendPacket(final AbstractStanza packet) {
925 if (stanzasSent == Integer.MAX_VALUE) {
926 resetStreamId();
927 disconnect(true);
928 return;
929 }
930 final String name = packet.getName();
931 if (name.equals("iq") || name.equals("message") || name.equals("presence")) {
932 ++stanzasSent;
933 }
934 tagWriter.writeStanzaAsync(packet);
935 if (packet instanceof MessagePacket && packet.getId() != null && getFeatures().sm()) {
936 if (Config.EXTENDED_SM_LOGGING) {
937 Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": requesting ack for message stanza #" + stanzasSent);
938 }
939 this.messageReceipts.put(stanzasSent, packet.getId());
940 tagWriter.writeStanzaAsync(new RequestPacket(this.smVersion));
941 }
942 }
943
944 public void sendPing() {
945 if (streamFeatures.hasChild("sm")) {
946 tagWriter.writeStanzaAsync(new RequestPacket(smVersion));
947 } else {
948 final IqPacket iq = new IqPacket(IqPacket.TYPE.GET);
949 iq.setFrom(account.getJid());
950 iq.addChild("ping", "urn:xmpp:ping");
951 this.sendIqPacket(iq, null);
952 }
953 this.lastPingSent = SystemClock.elapsedRealtime();
954 }
955
956 public void setOnMessagePacketReceivedListener(
957 final OnMessagePacketReceived listener) {
958 this.messageListener = listener;
959 }
960
961 public void setOnUnregisteredIqPacketReceivedListener(
962 final OnIqPacketReceived listener) {
963 this.unregisteredIqListener = listener;
964 }
965
966 public void setOnPresencePacketReceivedListener(
967 final OnPresencePacketReceived listener) {
968 this.presenceListener = listener;
969 }
970
971 public void setOnJinglePacketReceivedListener(
972 final OnJinglePacketReceived listener) {
973 this.jingleListener = listener;
974 }
975
976 public void setOnStatusChangedListener(final OnStatusChanged listener) {
977 this.statusListener = listener;
978 }
979
980 public void setOnBindListener(final OnBindListener listener) {
981 this.bindListener = listener;
982 }
983
984 public void setOnMessageAcknowledgeListener(final OnMessageAcknowledged listener) {
985 this.acknowledgedListener = listener;
986 }
987
988 public void addOnAdvancedStreamFeaturesAvailableListener(final OnAdvancedStreamFeaturesLoaded listener) {
989 if (!this.advancedStreamFeaturesLoadedListeners.contains(listener)) {
990 this.advancedStreamFeaturesLoadedListeners.add(listener);
991 }
992 }
993
994 public void disconnect(final boolean force) {
995 Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": disconnecting");
996 try {
997 if (force) {
998 socket.close();
999 return;
1000 }
1001 new Thread(new Runnable() {
1002
1003 @Override
1004 public void run() {
1005 if (tagWriter.isActive()) {
1006 tagWriter.finish();
1007 try {
1008 while (!tagWriter.finished()) {
1009 Log.d(Config.LOGTAG, "not yet finished");
1010 Thread.sleep(100);
1011 }
1012 tagWriter.writeTag(Tag.end("stream:stream"));
1013 socket.close();
1014 } catch (final IOException e) {
1015 Log.d(Config.LOGTAG,
1016 "io exception during disconnect");
1017 } catch (final InterruptedException e) {
1018 Log.d(Config.LOGTAG, "interrupted");
1019 }
1020 }
1021 }
1022 }).start();
1023 } catch (final IOException e) {
1024 Log.d(Config.LOGTAG, "io exception during disconnect");
1025 }
1026 }
1027
1028 public void resetStreamId() {
1029 this.streamId = null;
1030 }
1031
1032 public List<Jid> findDiscoItemsByFeature(final String feature) {
1033 final List<Jid> items = new ArrayList<>();
1034 for (final Entry<Jid, Info> cursor : disco.entrySet()) {
1035 if (cursor.getValue().features.contains(feature)) {
1036 items.add(cursor.getKey());
1037 }
1038 }
1039 return items;
1040 }
1041
1042 public Jid findDiscoItemByFeature(final String feature) {
1043 final List<Jid> items = findDiscoItemsByFeature(feature);
1044 if (items.size() >= 1) {
1045 return items.get(0);
1046 }
1047 return null;
1048 }
1049
1050 public void r() {
1051 this.tagWriter.writeStanzaAsync(new RequestPacket(smVersion));
1052 }
1053
1054 public String getMucServer() {
1055 for (final Entry<Jid, Info> cursor : disco.entrySet()) {
1056 final Info value = cursor.getValue();
1057 if (value.features.contains("http://jabber.org/protocol/muc")
1058 && !value.features.contains("jabber:iq:gateway")
1059 && !value.identities.contains(new Pair<>("conference","irc"))) {
1060 return cursor.getKey().toString();
1061 }
1062 }
1063 return null;
1064 }
1065
1066 public int getTimeToNextAttempt() {
1067 final int interval = (int) (25 * Math.pow(1.5, attempt));
1068 final int secondsSinceLast = (int) ((SystemClock.elapsedRealtime() - this.lastConnect) / 1000);
1069 return interval - secondsSinceLast;
1070 }
1071
1072 public int getAttempt() {
1073 return this.attempt;
1074 }
1075
1076 public Features getFeatures() {
1077 return this.features;
1078 }
1079
1080 public long getLastSessionEstablished() {
1081 final long diff;
1082 if (this.lastSessionStarted == 0) {
1083 diff = SystemClock.elapsedRealtime() - this.lastConnect;
1084 } else {
1085 diff = SystemClock.elapsedRealtime() - this.lastSessionStarted;
1086 }
1087 return System.currentTimeMillis() - diff;
1088 }
1089
1090 public long getLastConnect() {
1091 return this.lastConnect;
1092 }
1093
1094 public long getLastPingSent() {
1095 return this.lastPingSent;
1096 }
1097
1098 public long getLastPacketReceived() {
1099 return this.lastPacketReceived;
1100 }
1101
1102 public void sendActive() {
1103 this.sendPacket(new ActivePacket());
1104 }
1105
1106 public void sendInactive() {
1107 this.sendPacket(new InactivePacket());
1108 }
1109
1110 public void resetAttemptCount() {
1111 this.attempt = 0;
1112 this.lastConnect = 0;
1113 }
1114
1115 private class Info {
1116 public final ArrayList<String> features = new ArrayList<>();
1117 public final ArrayList<Pair<String,String>> identities = new ArrayList<>();
1118 }
1119
1120 private class UnauthorizedException extends IOException {
1121
1122 }
1123
1124 private class SecurityException extends IOException {
1125
1126 }
1127
1128 private class IncompatibleServerException extends IOException {
1129
1130 }
1131
1132 public class Features {
1133 XmppConnection connection;
1134 private boolean carbonsEnabled = false;
1135 private boolean encryptionEnabled = false;
1136 private boolean blockListRequested = false;
1137
1138 public Features(final XmppConnection connection) {
1139 this.connection = connection;
1140 }
1141
1142 private boolean hasDiscoFeature(final Jid server, final String feature) {
1143 return connection.disco.containsKey(server) &&
1144 connection.disco.get(server).features.contains(feature);
1145 }
1146
1147 public boolean carbons() {
1148 return hasDiscoFeature(account.getServer(), "urn:xmpp:carbons:2");
1149 }
1150
1151 public boolean blocking() {
1152 return hasDiscoFeature(account.getServer(), Xmlns.BLOCKING);
1153 }
1154
1155 public boolean register() {
1156 return hasDiscoFeature(account.getServer(), Xmlns.REGISTER);
1157 }
1158
1159 public boolean sm() {
1160 return streamId != null
1161 || (connection.streamFeatures != null && connection.streamFeatures.hasChild("sm"));
1162 }
1163
1164 public boolean csi() {
1165 return connection.streamFeatures != null && connection.streamFeatures.hasChild("csi", "urn:xmpp:csi:0");
1166 }
1167
1168 public boolean pep() {
1169 final Pair<String,String> needle = new Pair<>("pubsub","pep");
1170 Info info = disco.get(account.getServer());
1171 if (info != null && info.identities.contains(needle)) {
1172 return true;
1173 } else {
1174 info = disco.get(account.getJid().toBareJid());
1175 return info != null && info.identities.contains(needle);
1176 }
1177 }
1178
1179 public boolean mam() {
1180 if (hasDiscoFeature(account.getJid().toBareJid(), "urn:xmpp:mam:0")) {
1181 return true;
1182 } else {
1183 return hasDiscoFeature(account.getServer(), "urn:xmpp:mam:0");
1184 }
1185 }
1186
1187 public boolean advancedStreamFeaturesLoaded() {
1188 return disco.containsKey(account.getServer());
1189 }
1190
1191 public boolean rosterVersioning() {
1192 return connection.streamFeatures != null && connection.streamFeatures.hasChild("ver");
1193 }
1194
1195 public void setBlockListRequested(boolean value) {
1196 this.blockListRequested = value;
1197 }
1198
1199 public boolean httpUpload() {
1200 return findDiscoItemsByFeature(Xmlns.HTTP_UPLOAD).size() > 0;
1201 }
1202 }
1203
1204 private IqGenerator getIqGenerator() {
1205 return mXmppConnectionService.getIqGenerator();
1206 }
1207}