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 final Bundle result = DNSHelper.getSRVRecord(account.getServer());
159 final ArrayList<Parcelable> values = result.getParcelableArrayList("values");
160 if ("timeout".equals(result.getString("error"))) {
161 throw new IOException("timeout in dns");
162 } else if (values != null) {
163 int i = 0;
164 boolean socketError = true;
165 while (socketError && values.size() > i) {
166 final Bundle namePort = (Bundle) values.get(i);
167 try {
168 String srvRecordServer;
169 try {
170 srvRecordServer=IDN.toASCII(namePort.getString("name"));
171 } catch (final IllegalArgumentException e) {
172 // TODO: Handle me?`
173 srvRecordServer = "";
174 }
175 final int srvRecordPort = namePort.getInt("port");
176 final String srvIpServer = namePort.getString("ip");
177 final InetSocketAddress addr;
178 if (srvIpServer != null) {
179 addr = new InetSocketAddress(srvIpServer, srvRecordPort);
180 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
181 + ": using values from dns " + srvRecordServer
182 + "[" + srvIpServer + "]:" + srvRecordPort);
183 } else {
184 addr = new InetSocketAddress(srvRecordServer, srvRecordPort);
185 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
186 + ": using values from dns "
187 + srvRecordServer + ":" + srvRecordPort);
188 }
189 socket = new Socket();
190 socket.connect(addr, 20000);
191 socketError = false;
192 } catch (final UnknownHostException e) {
193 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": " + e.getMessage());
194 i++;
195 } catch (final IOException e) {
196 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": " + e.getMessage());
197 i++;
198 }
199 }
200 if (socketError) {
201 throw new UnknownHostException();
202 }
203 } else if (result.containsKey("error")
204 && "nosrv".equals(result.getString("error", null))) {
205 socket = new Socket(account.getServer().getDomainpart(), 5222);
206 } else {
207 throw new IOException("unhandled exception in DNS resolver");
208 }
209 final OutputStream out = socket.getOutputStream();
210 tagWriter.setOutputStream(out);
211 final InputStream in = socket.getInputStream();
212 tagReader.setInputStream(in);
213 tagWriter.beginDocument();
214 sendStartStream();
215 Tag nextTag;
216 while ((nextTag = tagReader.readTag()) != null) {
217 if (nextTag.isStart("stream")) {
218 processStream(nextTag);
219 break;
220 } else {
221 throw new IOException("unknown tag on connect");
222 }
223 }
224 if (socket.isConnected()) {
225 socket.close();
226 }
227 } catch (final UnknownHostException | ConnectException e) {
228 this.changeStatus(Account.State.SERVER_NOT_FOUND);
229 } catch (final IOException | XmlPullParserException | NoSuchAlgorithmException e) {
230 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": " + e.getMessage());
231 this.changeStatus(Account.State.OFFLINE);
232 this.attempt--; //don't count attempt when reconnecting instantly anyway
233 } finally {
234 if (wakeLock.isHeld()) {
235 try {
236 wakeLock.release();
237 } catch (final RuntimeException ignored) {
238 }
239 }
240 }
241 }
242
243 @Override
244 public void run() {
245 try {
246 if (socket != null) {
247 socket.close();
248 }
249 } catch (final IOException ignored) {
250
251 }
252 connect();
253 }
254
255 private void processStream(final Tag currentTag) throws XmlPullParserException,
256 IOException, NoSuchAlgorithmException {
257 Tag nextTag = tagReader.readTag();
258
259 while ((nextTag != null) && (!nextTag.isEnd("stream"))) {
260 if (nextTag.isStart("error")) {
261 processStreamError(nextTag);
262 } else if (nextTag.isStart("features")) {
263 processStreamFeatures(nextTag);
264 } else if (nextTag.isStart("proceed")) {
265 switchOverToTls(nextTag);
266 } else if (nextTag.isStart("success")) {
267 final String challenge = tagReader.readElement(nextTag).getContent();
268 try {
269 saslMechanism.getResponse(challenge);
270 } catch (final SaslMechanism.AuthenticationException e) {
271 disconnect(true);
272 Log.e(Config.LOGTAG, String.valueOf(e));
273 }
274 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": logged in");
275 account.setKey(Account.PINNED_MECHANISM_KEY,
276 String.valueOf(saslMechanism.getPriority()));
277 tagReader.reset();
278 sendStartStream();
279 processStream(tagReader.readTag());
280 break;
281 } else if (nextTag.isStart("failure")) {
282 tagReader.readElement(nextTag);
283 changeStatus(Account.State.UNAUTHORIZED);
284 } else if (nextTag.isStart("challenge")) {
285 final String challenge = tagReader.readElement(nextTag).getContent();
286 final Element response = new Element("response");
287 response.setAttribute("xmlns",
288 "urn:ietf:params:xml:ns:xmpp-sasl");
289 try {
290 response.setContent(saslMechanism.getResponse(challenge));
291 } catch (final SaslMechanism.AuthenticationException e) {
292 // TODO: Send auth abort tag.
293 Log.e(Config.LOGTAG, e.toString());
294 }
295 tagWriter.writeElement(response);
296 } else if (nextTag.isStart("enabled")) {
297 final Element enabled = tagReader.readElement(nextTag);
298 if ("true".equals(enabled.getAttribute("resume"))) {
299 this.streamId = enabled.getAttribute("id");
300 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
301 + ": stream managment(" + smVersion
302 + ") enabled (resumable)");
303 } else {
304 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
305 + ": stream managment(" + smVersion + ") enabled");
306 }
307 this.lastSessionStarted = SystemClock.elapsedRealtime();
308 this.stanzasReceived = 0;
309 final RequestPacket r = new RequestPacket(smVersion);
310 tagWriter.writeStanzaAsync(r);
311 } else if (nextTag.isStart("resumed")) {
312 lastPacketReceived = SystemClock.elapsedRealtime();
313 final Element resumed = tagReader.readElement(nextTag);
314 final String h = resumed.getAttribute("h");
315 try {
316 final int serverCount = Integer.parseInt(h);
317 if (serverCount != stanzasSent) {
318 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
319 + ": session resumed with lost packages");
320 stanzasSent = serverCount;
321 } else {
322 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
323 + ": session resumed");
324 }
325 if (acknowledgedListener != null) {
326 for (int i = 0; i < messageReceipts.size(); ++i) {
327 if (serverCount >= messageReceipts.keyAt(i)) {
328 acknowledgedListener.onMessageAcknowledged(
329 account, messageReceipts.valueAt(i));
330 }
331 }
332 }
333 messageReceipts.clear();
334 } catch (final NumberFormatException ignored) {
335 }
336 sendServiceDiscoveryInfo(account.getServer());
337 sendServiceDiscoveryInfo(account.getJid().toBareJid());
338 sendServiceDiscoveryItems(account.getServer());
339 sendInitialPing();
340 } else if (nextTag.isStart("r")) {
341 tagReader.readElement(nextTag);
342 if (Config.EXTENDED_SM_LOGGING) {
343 Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": acknowledging stanza #" + this.stanzasReceived);
344 }
345 final AckPacket ack = new AckPacket(this.stanzasReceived, smVersion);
346 tagWriter.writeStanzaAsync(ack);
347 } else if (nextTag.isStart("a")) {
348 final Element ack = tagReader.readElement(nextTag);
349 lastPacketReceived = SystemClock.elapsedRealtime();
350 final int serverSequence = Integer.parseInt(ack.getAttribute("h"));
351 if (Config.EXTENDED_SM_LOGGING) {
352 Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": server acknowledged stanza #" + serverSequence);
353 }
354 final String msgId = this.messageReceipts.get(serverSequence);
355 if (msgId != null) {
356 if (this.acknowledgedListener != null) {
357 this.acknowledgedListener.onMessageAcknowledged(
358 account, msgId);
359 }
360 this.messageReceipts.remove(serverSequence);
361 }
362 } else if (nextTag.isStart("failed")) {
363 tagReader.readElement(nextTag);
364 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": resumption failed");
365 streamId = null;
366 if (account.getStatus() != Account.State.ONLINE) {
367 sendBindRequest();
368 }
369 } else if (nextTag.isStart("iq")) {
370 processIq(nextTag);
371 } else if (nextTag.isStart("message")) {
372 processMessage(nextTag);
373 } else if (nextTag.isStart("presence")) {
374 processPresence(nextTag);
375 }
376 nextTag = tagReader.readTag();
377 }
378 if (account.getStatus() == Account.State.ONLINE) {
379 account. setStatus(Account.State.OFFLINE);
380 if (statusListener != null) {
381 statusListener.onStatusChanged(account);
382 }
383 }
384 }
385
386 private void sendInitialPing() {
387 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": sending intial ping");
388 final IqPacket iq = new IqPacket(IqPacket.TYPE.GET);
389 iq.setFrom(account.getJid());
390 iq.addChild("ping", "urn:xmpp:ping");
391 this.sendIqPacket(iq, new OnIqPacketReceived() {
392 @Override
393 public void onIqPacketReceived(final Account account, final IqPacket packet) {
394 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
395 + ": online with resource " + account.getResource());
396 changeStatus(Account.State.ONLINE);
397 }
398 });
399 }
400
401 private Element processPacket(final Tag currentTag, final int packetType)
402 throws XmlPullParserException, IOException {
403 Element element;
404 switch (packetType) {
405 case PACKET_IQ:
406 element = new IqPacket();
407 break;
408 case PACKET_MESSAGE:
409 element = new MessagePacket();
410 break;
411 case PACKET_PRESENCE:
412 element = new PresencePacket();
413 break;
414 default:
415 return null;
416 }
417 element.setAttributes(currentTag.getAttributes());
418 Tag nextTag = tagReader.readTag();
419 if (nextTag == null) {
420 throw new IOException("interrupted mid tag");
421 }
422 while (!nextTag.isEnd(element.getName())) {
423 if (!nextTag.isNo()) {
424 final Element child = tagReader.readElement(nextTag);
425 final String type = currentTag.getAttribute("type");
426 if (packetType == PACKET_IQ
427 && "jingle".equals(child.getName())
428 && ("set".equalsIgnoreCase(type) || "get"
429 .equalsIgnoreCase(type))) {
430 element = new JinglePacket();
431 element.setAttributes(currentTag.getAttributes());
432 }
433 element.addChild(child);
434 }
435 nextTag = tagReader.readTag();
436 if (nextTag == null) {
437 throw new IOException("interrupted mid tag");
438 }
439 }
440 if (stanzasReceived == Integer.MAX_VALUE) {
441 resetStreamId();
442 throw new IOException("time to restart the session. cant handle >2 billion pcks");
443 }
444 ++stanzasReceived;
445 lastPacketReceived = SystemClock.elapsedRealtime();
446 return element;
447 }
448
449 private void processIq(final Tag currentTag) throws XmlPullParserException, IOException {
450 final IqPacket packet = (IqPacket) processPacket(currentTag, PACKET_IQ);
451
452 if (packet.getId() == null) {
453 return; // an iq packet without id is definitely invalid
454 }
455
456 if (packet instanceof JinglePacket) {
457 if (this.jingleListener != null) {
458 this.jingleListener.onJinglePacketReceived(account,(JinglePacket) packet);
459 }
460 } else {
461 if (packetCallbacks.containsKey(packet.getId())) {
462 final Pair<IqPacket, OnIqPacketReceived> packetCallbackDuple = packetCallbacks.get(packet.getId());
463 // Packets to the server should have responses from the server
464 if (packetCallbackDuple.first.toServer(account)) {
465 if (packet.fromServer(account)) {
466 packetCallbackDuple.second.onIqPacketReceived(account, packet);
467 packetCallbacks.remove(packet.getId());
468 } else {
469 Log.e(Config.LOGTAG,account.getJid().toBareJid().toString()+": ignoring spoofed iq packet");
470 }
471 } else {
472 if (packet.getFrom().equals(packetCallbackDuple.first.getTo())) {
473 packetCallbackDuple.second.onIqPacketReceived(account, packet);
474 packetCallbacks.remove(packet.getId());
475 } else {
476 Log.e(Config.LOGTAG,account.getJid().toBareJid().toString()+": ignoring spoofed iq packet");
477 }
478 }
479 } else if (packet.getType() == IqPacket.TYPE.GET|| packet.getType() == IqPacket.TYPE.SET) {
480 this.unregisteredIqListener.onIqPacketReceived(account, packet);
481 }
482 }
483 }
484
485 private void processMessage(final Tag currentTag) throws XmlPullParserException, IOException {
486 final MessagePacket packet = (MessagePacket) processPacket(currentTag,PACKET_MESSAGE);
487 this.messageListener.onMessagePacketReceived(account, packet);
488 }
489
490 private void processPresence(final Tag currentTag) throws XmlPullParserException, IOException {
491 PresencePacket packet = (PresencePacket) processPacket(currentTag, PACKET_PRESENCE);
492 this.presenceListener.onPresencePacketReceived(account, packet);
493 }
494
495 private void sendStartTLS() throws IOException {
496 final Tag startTLS = Tag.empty("starttls");
497 startTLS.setAttribute("xmlns", "urn:ietf:params:xml:ns:xmpp-tls");
498 tagWriter.writeTag(startTLS);
499 }
500
501 private SharedPreferences getPreferences() {
502 return PreferenceManager.getDefaultSharedPreferences(applicationContext);
503 }
504
505 private boolean enableLegacySSL() {
506 return getPreferences().getBoolean("enable_legacy_ssl", false);
507 }
508
509 private void switchOverToTls(final Tag currentTag) throws XmlPullParserException, IOException {
510 tagReader.readTag();
511 try {
512 final SSLContext sc = SSLContext.getInstance("TLS");
513 sc.init(null,new X509TrustManager[]{this.mXmppConnectionService.getMemorizingTrustManager()},mXmppConnectionService.getRNG());
514 final SSLSocketFactory factory = sc.getSocketFactory();
515 final HostnameVerifier verifier = this.mXmppConnectionService.getMemorizingTrustManager().wrapHostnameVerifier(new StrictHostnameVerifier());
516 final InetAddress address = socket == null ? null : socket.getInetAddress();
517
518 if (factory == null || address == null || verifier == null) {
519 throw new IOException("could not setup ssl");
520 }
521
522 final SSLSocket sslSocket = (SSLSocket) factory.createSocket(socket,address.getHostAddress(), socket.getPort(),true);
523
524 if (sslSocket == null) {
525 throw new IOException("could not initialize ssl socket");
526 }
527
528 final String[] supportProtocols;
529 final Collection<String> supportedProtocols = new LinkedList<>(
530 Arrays.asList(sslSocket.getSupportedProtocols()));
531 supportedProtocols.remove("SSLv3");
532 supportProtocols = supportedProtocols.toArray(new String[supportedProtocols.size()]);
533
534 sslSocket.setEnabledProtocols(supportProtocols);
535
536 final String[] cipherSuites = CryptoHelper.getOrderedCipherSuites(
537 sslSocket.getSupportedCipherSuites());
538 //Log.d(Config.LOGTAG, "Using ciphers: " + Arrays.toString(cipherSuites));
539 if (cipherSuites.length > 0) {
540 sslSocket.setEnabledCipherSuites(cipherSuites);
541 }
542
543 if (!verifier.verify(account.getServer().getDomainpart(),sslSocket.getSession())) {
544 Log.d(Config.LOGTAG,account.getJid().toBareJid()+": TLS certificate verification failed");
545 disconnect(true);
546 changeStatus(Account.State.SECURITY_ERROR);
547 }
548 tagReader.setInputStream(sslSocket.getInputStream());
549 tagWriter.setOutputStream(sslSocket.getOutputStream());
550 sendStartStream();
551 Log.d(Config.LOGTAG, account.getJid().toBareJid()+ ": TLS connection established");
552 features.encryptionEnabled = true;
553 processStream(tagReader.readTag());
554 sslSocket.close();
555 } catch (final NoSuchAlgorithmException | KeyManagementException e1) {
556 Log.d(Config.LOGTAG,account.getJid().toBareJid()+": TLS certificate verification failed");
557 disconnect(true);
558 changeStatus(Account.State.SECURITY_ERROR);
559 }
560 }
561
562 private void processStreamFeatures(final Tag currentTag)
563 throws XmlPullParserException, IOException {
564 this.streamFeatures = tagReader.readElement(currentTag);
565 if (this.streamFeatures.hasChild("starttls") && !features.encryptionEnabled) {
566 sendStartTLS();
567 } else if (this.streamFeatures.hasChild("register")
568 && account.isOptionSet(Account.OPTION_REGISTER)
569 && features.encryptionEnabled) {
570 sendRegistryRequest();
571 } else if (!this.streamFeatures.hasChild("register")
572 && account.isOptionSet(Account.OPTION_REGISTER)) {
573 changeStatus(Account.State.REGISTRATION_NOT_SUPPORTED);
574 disconnect(true);
575 } else if (this.streamFeatures.hasChild("mechanisms")
576 && shouldAuthenticate && features.encryptionEnabled) {
577 final List<String> mechanisms = extractMechanisms(streamFeatures
578 .findChild("mechanisms"));
579 final Element auth = new Element("auth");
580 auth.setAttribute("xmlns", "urn:ietf:params:xml:ns:xmpp-sasl");
581 if (mechanisms.contains("SCRAM-SHA-1")) {
582 saslMechanism = new ScramSha1(tagWriter, account, mXmppConnectionService.getRNG());
583 } else if (mechanisms.contains("PLAIN")) {
584 saslMechanism = new Plain(tagWriter, account);
585 } else if (mechanisms.contains("DIGEST-MD5")) {
586 saslMechanism = new DigestMd5(tagWriter, account, mXmppConnectionService.getRNG());
587 }
588 if (saslMechanism != null) {
589 final JSONObject keys = account.getKeys();
590 try {
591 if (keys.has(Account.PINNED_MECHANISM_KEY) &&
592 keys.getInt(Account.PINNED_MECHANISM_KEY) > saslMechanism.getPriority()) {
593 Log.e(Config.LOGTAG, "Auth failed. Authentication mechanism " + saslMechanism.getMechanism() +
594 " has lower priority (" + String.valueOf(saslMechanism.getPriority()) +
595 ") than pinned priority (" + keys.getInt(Account.PINNED_MECHANISM_KEY) +
596 "). Possible downgrade attack?");
597 disconnect(true);
598 changeStatus(Account.State.SECURITY_ERROR);
599 }
600 } catch (final JSONException e) {
601 Log.d(Config.LOGTAG, "Parse error while checking pinned auth mechanism");
602 }
603 Log.d(Config.LOGTAG, account.getJid().toString() + ": Authenticating with " + saslMechanism.getMechanism());
604 auth.setAttribute("mechanism", saslMechanism.getMechanism());
605 if (!saslMechanism.getClientFirstMessage().isEmpty()) {
606 auth.setContent(saslMechanism.getClientFirstMessage());
607 }
608 tagWriter.writeElement(auth);
609 } else {
610 disconnect(true);
611 changeStatus(Account.State.INCOMPATIBLE_SERVER);
612 }
613 } else if (this.streamFeatures.hasChild("sm", "urn:xmpp:sm:"
614 + smVersion)
615 && streamId != null) {
616 if (Config.EXTENDED_SM_LOGGING) {
617 Log.d(Config.LOGTAG,account.getJid().toBareJid()+": resuming after stanza #"+stanzasReceived);
618 }
619 final ResumePacket resume = new ResumePacket(this.streamId, stanzasReceived, smVersion);
620 this.tagWriter.writeStanzaAsync(resume);
621 } else if (this.streamFeatures.hasChild("bind") && shouldBind) {
622 sendBindRequest();
623 } else {
624 disconnect(true);
625 changeStatus(Account.State.INCOMPATIBLE_SERVER);
626 }
627 }
628
629 private List<String> extractMechanisms(final Element stream) {
630 final ArrayList<String> mechanisms = new ArrayList<>(stream
631 .getChildren().size());
632 for (final Element child : stream.getChildren()) {
633 mechanisms.add(child.getContent());
634 }
635 return mechanisms;
636 }
637
638 private void sendRegistryRequest() {
639 final IqPacket register = new IqPacket(IqPacket.TYPE.GET);
640 register.query("jabber:iq:register");
641 register.setTo(account.getServer());
642 sendIqPacket(register, new OnIqPacketReceived() {
643
644 @Override
645 public void onIqPacketReceived(final Account account, final IqPacket packet) {
646 final Element instructions = packet.query().findChild("instructions");
647 if (packet.query().hasChild("username")
648 && (packet.query().hasChild("password"))) {
649 final IqPacket register = new IqPacket(IqPacket.TYPE.SET);
650 final Element username = new Element("username").setContent(account.getUsername());
651 final Element password = new Element("password").setContent(account.getPassword());
652 register.query("jabber:iq:register").addChild(username);
653 register.query().addChild(password);
654 sendIqPacket(register, new OnIqPacketReceived() {
655
656 @Override
657 public void onIqPacketReceived(final Account account, final IqPacket packet) {
658 if (packet.getType() == IqPacket.TYPE.RESULT) {
659 account.setOption(Account.OPTION_REGISTER,
660 false);
661 changeStatus(Account.State.REGISTRATION_SUCCESSFUL);
662 } else if (packet.hasChild("error")
663 && (packet.findChild("error")
664 .hasChild("conflict"))) {
665 changeStatus(Account.State.REGISTRATION_CONFLICT);
666 } else {
667 changeStatus(Account.State.REGISTRATION_FAILED);
668 Log.d(Config.LOGTAG, packet.toString());
669 }
670 disconnect(true);
671 }
672 });
673 } else {
674 changeStatus(Account.State.REGISTRATION_FAILED);
675 disconnect(true);
676 Log.d(Config.LOGTAG, account.getJid().toBareJid()
677 + ": could not register. instructions are"
678 + instructions != null ? instructions.getContent() : "");
679 }
680 }
681 });
682 }
683
684 private void sendBindRequest() {
685 while(!mXmppConnectionService.areMessagesInitialized()) {
686 try {
687 Thread.sleep(500);
688 } catch (final InterruptedException ignored) {
689 }
690 }
691 final IqPacket iq = new IqPacket(IqPacket.TYPE.SET);
692 iq.addChild("bind", "urn:ietf:params:xml:ns:xmpp-bind")
693 .addChild("resource").setContent(account.getResource());
694 this.sendUnmodifiedIqPacket(iq, new OnIqPacketReceived() {
695 @Override
696 public void onIqPacketReceived(final Account account, final IqPacket packet) {
697 final Element bind = packet.findChild("bind");
698 if (bind != null) {
699 final Element jid = bind.findChild("jid");
700 if (jid != null && jid.getContent() != null) {
701 try {
702 account.setResource(Jid.fromString(jid.getContent()).getResourcepart());
703 } catch (final InvalidJidException e) {
704 // TODO: Handle the case where an external JID is technically invalid?
705 }
706 if (streamFeatures.hasChild("session")) {
707 sendStartSession();
708 } else {
709 sendPostBindInitialization();
710 }
711 } else {
712 disconnect(true);
713 }
714 } else {
715 disconnect(true);
716 }
717 }
718 });
719 }
720
721 private void sendStartSession() {
722 final IqPacket startSession = new IqPacket(IqPacket.TYPE.SET);
723 startSession.addChild("session","urn:ietf:params:xml:ns:xmpp-session");
724 this.sendUnmodifiedIqPacket(startSession, new OnIqPacketReceived() {
725 @Override
726 public void onIqPacketReceived(Account account, IqPacket packet) {
727 if (packet.getType() == IqPacket.TYPE.RESULT) {
728 sendPostBindInitialization();
729 } else {
730 disconnect(true);
731 }
732 }
733 });
734 }
735
736 private void sendPostBindInitialization() {
737 smVersion = 0;
738 if (streamFeatures.hasChild("sm", "urn:xmpp:sm:3")) {
739 smVersion = 3;
740 } else if (streamFeatures.hasChild("sm", "urn:xmpp:sm:2")) {
741 smVersion = 2;
742 }
743 if (smVersion != 0) {
744 final EnablePacket enable = new EnablePacket(smVersion);
745 tagWriter.writeStanzaAsync(enable);
746 stanzasSent = 0;
747 messageReceipts.clear();
748 }
749 features.carbonsEnabled = false;
750 features.blockListRequested = false;
751 disco.clear();
752 sendServiceDiscoveryInfo(account.getServer());
753 sendServiceDiscoveryInfo(account.getJid().toBareJid());
754 sendServiceDiscoveryItems(account.getServer());
755 if (bindListener != null) {
756 bindListener.onBind(account);
757 }
758 sendInitialPing();
759 }
760
761 private void sendServiceDiscoveryInfo(final Jid jid) {
762 if (disco.containsKey(jid)) {
763 if (account.getServer().equals(jid)) {
764 enableAdvancedStreamFeatures();
765 }
766 } else {
767 final IqPacket iq = new IqPacket(IqPacket.TYPE.GET);
768 iq.setTo(jid);
769 iq.query("http://jabber.org/protocol/disco#info");
770 this.sendIqPacket(iq, new OnIqPacketReceived() {
771
772 @Override
773 public void onIqPacketReceived(final Account account, final IqPacket packet) {
774 final List<Element> elements = packet.query().getChildren();
775 final Info info = new Info();
776 for (final Element element : elements) {
777 if (element.getName().equals("identity")) {
778 String type = element.getAttribute("type");
779 String category = element.getAttribute("category");
780 if (type != null && category != null) {
781 info.identities.add(new Pair<>(category,type));
782 }
783 } else if (element.getName().equals("feature")) {
784 info.features.add(element.getAttribute("var"));
785 }
786 }
787 disco.put(jid, info);
788
789 if (account.getServer().equals(jid)) {
790 enableAdvancedStreamFeatures();
791 for (final OnAdvancedStreamFeaturesLoaded listener : advancedStreamFeaturesLoadedListeners) {
792 listener.onAdvancedStreamFeaturesAvailable(account);
793 }
794 }
795 }
796 });
797 }
798 }
799
800 private void enableAdvancedStreamFeatures() {
801 if (getFeatures().carbons() && !features.carbonsEnabled) {
802 sendEnableCarbons();
803 }
804 if (getFeatures().blocking() && !features.blockListRequested) {
805 Log.d(Config.LOGTAG,account.getJid().toBareJid()+": Requesting block list");
806 this.sendIqPacket(getIqGenerator().generateGetBlockList(), mXmppConnectionService.getIqParser());
807 }
808 }
809
810 private void sendServiceDiscoveryItems(final Jid server) {
811 final IqPacket iq = new IqPacket(IqPacket.TYPE.GET);
812 iq.setTo(server.toDomainJid());
813 iq.query("http://jabber.org/protocol/disco#items");
814 this.sendIqPacket(iq, new OnIqPacketReceived() {
815
816 @Override
817 public void onIqPacketReceived(final Account account, final IqPacket packet) {
818 final List<Element> elements = packet.query().getChildren();
819 for (final Element element : elements) {
820 if (element.getName().equals("item")) {
821 final Jid jid = element.getAttributeAsJid("jid");
822 if (jid != null && !jid.equals(account.getServer())) {
823 sendServiceDiscoveryInfo(jid);
824 }
825 }
826 }
827 }
828 });
829 }
830
831 private void sendEnableCarbons() {
832 final IqPacket iq = new IqPacket(IqPacket.TYPE.SET);
833 iq.addChild("enable", "urn:xmpp:carbons:2");
834 this.sendIqPacket(iq, new OnIqPacketReceived() {
835
836 @Override
837 public void onIqPacketReceived(final Account account, final IqPacket packet) {
838 if (!packet.hasChild("error")) {
839 Log.d(Config.LOGTAG, account.getJid().toBareJid()
840 + ": successfully enabled carbons");
841 features.carbonsEnabled = true;
842 } else {
843 Log.d(Config.LOGTAG, account.getJid().toBareJid()
844 + ": error enableing carbons " + packet.toString());
845 }
846 }
847 });
848 }
849
850 private void processStreamError(final Tag currentTag)
851 throws XmlPullParserException, IOException {
852 final Element streamError = tagReader.readElement(currentTag);
853 if (streamError != null && streamError.hasChild("conflict")) {
854 final String resource = account.getResource().split("\\.")[0];
855 account.setResource(resource + "." + nextRandomId());
856 Log.d(Config.LOGTAG,
857 account.getJid().toBareJid() + ": switching resource due to conflict ("
858 + account.getResource() + ")");
859 }
860 }
861
862 private void sendStartStream() throws IOException {
863 final Tag stream = Tag.start("stream:stream");
864 stream.setAttribute("from", account.getJid().toBareJid().toString());
865 stream.setAttribute("to", account.getServer().toString());
866 stream.setAttribute("version", "1.0");
867 stream.setAttribute("xml:lang", "en");
868 stream.setAttribute("xmlns", "jabber:client");
869 stream.setAttribute("xmlns:stream", "http://etherx.jabber.org/streams");
870 tagWriter.writeTag(stream);
871 }
872
873 private String nextRandomId() {
874 return new BigInteger(50, mXmppConnectionService.getRNG()).toString(32);
875 }
876
877 public void sendIqPacket(final IqPacket packet, final OnIqPacketReceived callback) {
878 packet.setFrom(account.getJid());
879 this.sendUnmodifiedIqPacket(packet,callback);
880
881 }
882
883 private synchronized void sendUnmodifiedIqPacket(final IqPacket packet, final OnIqPacketReceived callback) {
884 if (packet.getId() == null) {
885 final String id = nextRandomId();
886 packet.setAttribute("id", id);
887 }
888 if (callback != null) {
889 if (packet.getId() == null) {
890 packet.setId(nextRandomId());
891 }
892 packetCallbacks.put(packet.getId(), new Pair<>(packet, callback));
893 }
894 this.sendPacket(packet);
895 }
896
897 public void sendMessagePacket(final MessagePacket packet) {
898 this.sendPacket(packet);
899 }
900
901 public void sendPresencePacket(final PresencePacket packet) {
902 this.sendPacket(packet);
903 }
904
905 private synchronized void sendPacket(final AbstractStanza packet) {
906 if (stanzasSent == Integer.MAX_VALUE) {
907 resetStreamId();
908 disconnect(true);
909 return;
910 }
911 final String name = packet.getName();
912 if (name.equals("iq") || name.equals("message") || name.equals("presence")) {
913 ++stanzasSent;
914 }
915 tagWriter.writeStanzaAsync(packet);
916 if (packet instanceof MessagePacket && packet.getId() != null && this.streamId != null) {
917 if (Config.EXTENDED_SM_LOGGING) {
918 Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": requesting ack for message stanza #" + stanzasSent);
919 }
920 this.messageReceipts.put(stanzasSent, packet.getId());
921 tagWriter.writeStanzaAsync(new RequestPacket(this.smVersion));
922 }
923 }
924
925 public void sendPing() {
926 if (streamFeatures.hasChild("sm")) {
927 tagWriter.writeStanzaAsync(new RequestPacket(smVersion));
928 } else {
929 final IqPacket iq = new IqPacket(IqPacket.TYPE.GET);
930 iq.setFrom(account.getJid());
931 iq.addChild("ping", "urn:xmpp:ping");
932 this.sendIqPacket(iq, null);
933 }
934 this.lastPingSent = SystemClock.elapsedRealtime();
935 }
936
937 public void setOnMessagePacketReceivedListener(
938 final OnMessagePacketReceived listener) {
939 this.messageListener = listener;
940 }
941
942 public void setOnUnregisteredIqPacketReceivedListener(
943 final OnIqPacketReceived listener) {
944 this.unregisteredIqListener = listener;
945 }
946
947 public void setOnPresencePacketReceivedListener(
948 final OnPresencePacketReceived listener) {
949 this.presenceListener = listener;
950 }
951
952 public void setOnJinglePacketReceivedListener(
953 final OnJinglePacketReceived listener) {
954 this.jingleListener = listener;
955 }
956
957 public void setOnStatusChangedListener(final OnStatusChanged listener) {
958 this.statusListener = listener;
959 }
960
961 public void setOnBindListener(final OnBindListener listener) {
962 this.bindListener = listener;
963 }
964
965 public void setOnMessageAcknowledgeListener(final OnMessageAcknowledged listener) {
966 this.acknowledgedListener = listener;
967 }
968
969 public void addOnAdvancedStreamFeaturesAvailableListener(final OnAdvancedStreamFeaturesLoaded listener) {
970 if (!this.advancedStreamFeaturesLoadedListeners.contains(listener)) {
971 this.advancedStreamFeaturesLoadedListeners.add(listener);
972 }
973 }
974
975 public void disconnect(final boolean force) {
976 Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": disconnecting");
977 try {
978 if (force) {
979 socket.close();
980 return;
981 }
982 new Thread(new Runnable() {
983
984 @Override
985 public void run() {
986 if (tagWriter.isActive()) {
987 tagWriter.finish();
988 try {
989 while (!tagWriter.finished()) {
990 Log.d(Config.LOGTAG, "not yet finished");
991 Thread.sleep(100);
992 }
993 tagWriter.writeTag(Tag.end("stream:stream"));
994 socket.close();
995 } catch (final IOException e) {
996 Log.d(Config.LOGTAG,
997 "io exception during disconnect");
998 } catch (final InterruptedException e) {
999 Log.d(Config.LOGTAG, "interrupted");
1000 }
1001 }
1002 }
1003 }).start();
1004 } catch (final IOException e) {
1005 Log.d(Config.LOGTAG, "io exception during disconnect");
1006 }
1007 }
1008
1009 public void resetStreamId() {
1010 this.streamId = null;
1011 }
1012
1013 public List<String> findDiscoItemsByFeature(final String feature) {
1014 final List<String> items = new ArrayList<>();
1015 for (final Entry<Jid, Info> cursor : disco.entrySet()) {
1016 if (cursor.getValue().features.contains(feature)) {
1017 items.add(cursor.getKey().toString());
1018 }
1019 }
1020 return items;
1021 }
1022
1023 public String findDiscoItemByFeature(final String feature) {
1024 final List<String> items = findDiscoItemsByFeature(feature);
1025 if (items.size() >= 1) {
1026 return items.get(0);
1027 }
1028 return null;
1029 }
1030
1031 public void r() {
1032 this.tagWriter.writeStanzaAsync(new RequestPacket(smVersion));
1033 }
1034
1035 public String getMucServer() {
1036 for (final Entry<Jid, Info> cursor : disco.entrySet()) {
1037 final Info value = cursor.getValue();
1038 if (value.features.contains("http://jabber.org/protocol/muc")
1039 && !value.features.contains("jabber:iq:gateway")
1040 && !value.identities.contains(new Pair<>("conference","irc"))) {
1041 return cursor.getKey().toString();
1042 }
1043 }
1044 return null;
1045 }
1046
1047 public int getTimeToNextAttempt() {
1048 final int interval = (int) (25 * Math.pow(1.5, attempt));
1049 final int secondsSinceLast = (int) ((SystemClock.elapsedRealtime() - this.lastConnect) / 1000);
1050 return interval - secondsSinceLast;
1051 }
1052
1053 public int getAttempt() {
1054 return this.attempt;
1055 }
1056
1057 public Features getFeatures() {
1058 return this.features;
1059 }
1060
1061 public long getLastSessionEstablished() {
1062 final long diff;
1063 if (this.lastSessionStarted == 0) {
1064 diff = SystemClock.elapsedRealtime() - this.lastConnect;
1065 } else {
1066 diff = SystemClock.elapsedRealtime() - this.lastSessionStarted;
1067 }
1068 return System.currentTimeMillis() - diff;
1069 }
1070
1071 public long getLastConnect() {
1072 return this.lastConnect;
1073 }
1074
1075 public long getLastPingSent() {
1076 return this.lastPingSent;
1077 }
1078
1079 public long getLastPacketReceived() {
1080 return this.lastPacketReceived;
1081 }
1082
1083 public void sendActive() {
1084 this.sendPacket(new ActivePacket());
1085 }
1086
1087 public void sendInactive() {
1088 this.sendPacket(new InactivePacket());
1089 }
1090
1091 public void resetAttemptCount() {
1092 this.attempt = 0;
1093 this.lastConnect = 0;
1094 }
1095
1096 private class Info {
1097 public final ArrayList<String> features = new ArrayList<>();
1098 public final ArrayList<Pair<String,String>> identities = new ArrayList<>();
1099 }
1100
1101 public class Features {
1102 XmppConnection connection;
1103 private boolean carbonsEnabled = false;
1104 private boolean encryptionEnabled = false;
1105 private boolean blockListRequested = false;
1106
1107 public Features(final XmppConnection connection) {
1108 this.connection = connection;
1109 }
1110
1111 private boolean hasDiscoFeature(final Jid server, final String feature) {
1112 return connection.disco.containsKey(server) &&
1113 connection.disco.get(server).features.contains(feature);
1114 }
1115
1116 public boolean carbons() {
1117 return hasDiscoFeature(account.getServer(), "urn:xmpp:carbons:2");
1118 }
1119
1120 public boolean blocking() {
1121 return hasDiscoFeature(account.getServer(), Xmlns.BLOCKING);
1122 }
1123
1124 public boolean register() {
1125 return hasDiscoFeature(account.getServer(), Xmlns.REGISTER);
1126 }
1127
1128 public boolean sm() {
1129 return streamId != null
1130 || (connection.streamFeatures != null && connection.streamFeatures.hasChild("sm"));
1131 }
1132
1133 public boolean csi() {
1134 return connection.streamFeatures != null && connection.streamFeatures.hasChild("csi", "urn:xmpp:csi:0");
1135 }
1136
1137 public boolean pep() {
1138 final Pair<String,String> needle = new Pair<>("pubsub","pep");
1139 Info info = disco.get(account.getServer());
1140 if (info != null && info.identities.contains(needle)) {
1141 return true;
1142 } else {
1143 info = disco.get(account.getJid().toBareJid());
1144 return info != null && info.identities.contains(needle);
1145 }
1146 }
1147
1148 public boolean mam() {
1149 if (hasDiscoFeature(account.getJid().toBareJid(), "urn:xmpp:mam:0")) {
1150 return true;
1151 } else {
1152 return hasDiscoFeature(account.getServer(), "urn:xmpp:mam:0");
1153 }
1154 }
1155
1156 public boolean advancedStreamFeaturesLoaded() {
1157 return disco.containsKey(account.getServer());
1158 }
1159
1160 public boolean rosterVersioning() {
1161 return connection.streamFeatures != null && connection.streamFeatures.hasChild("ver");
1162 }
1163
1164 public void setBlockListRequested(boolean value) {
1165 this.blockListRequested = value;
1166 }
1167 }
1168
1169 private IqGenerator getIqGenerator() {
1170 return mXmppConnectionService.getIqGenerator();
1171 }
1172}