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.Iterator;
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 if (result == null) {
169 throw new IOException("unhandled exception in DNS resolver");
170 }
171 final ArrayList<Parcelable> values = result.getParcelableArrayList("values");
172 if ("timeout".equals(result.getString("error"))) {
173 throw new IOException("timeout in dns");
174 } else if (values != null) {
175 int i = 0;
176 boolean socketError = true;
177 while (socketError && values.size() > i) {
178 final Bundle namePort = (Bundle) values.get(i);
179 try {
180 String srvRecordServer;
181 try {
182 srvRecordServer = IDN.toASCII(namePort.getString("name"));
183 } catch (final IllegalArgumentException e) {
184 // TODO: Handle me?`
185 srvRecordServer = "";
186 }
187 final int srvRecordPort = namePort.getInt("port");
188 final String srvIpServer = namePort.getString("ip");
189 final InetSocketAddress addr;
190 if (srvIpServer != null) {
191 addr = new InetSocketAddress(srvIpServer, srvRecordPort);
192 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
193 + ": using values from dns " + srvRecordServer
194 + "[" + srvIpServer + "]:" + srvRecordPort);
195 } else {
196 addr = new InetSocketAddress(srvRecordServer, srvRecordPort);
197 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
198 + ": using values from dns "
199 + srvRecordServer + ":" + srvRecordPort);
200 }
201 socket = new Socket();
202 socket.connect(addr, Config.SOCKET_TIMEOUT * 1000);
203 socketError = false;
204 } catch (final UnknownHostException e) {
205 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": " + e.getMessage());
206 i++;
207 } catch (final IOException e) {
208 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": " + e.getMessage());
209 i++;
210 }
211 }
212 if (socketError) {
213 throw new UnknownHostException();
214 }
215 } else {
216 throw new IOException("unhandled exception in DNS resolver");
217 }
218 }
219 final OutputStream out = socket.getOutputStream();
220 tagWriter.setOutputStream(out);
221 final InputStream in = socket.getInputStream();
222 tagReader.setInputStream(in);
223 tagWriter.beginDocument();
224 sendStartStream();
225 Tag nextTag;
226 while ((nextTag = tagReader.readTag()) != null) {
227 if (nextTag.isStart("stream")) {
228 processStream(nextTag);
229 break;
230 } else {
231 throw new IOException("unknown tag on connect");
232 }
233 }
234 if (socket.isConnected()) {
235 socket.close();
236 }
237 } catch (final IncompatibleServerException e) {
238 this.changeStatus(Account.State.INCOMPATIBLE_SERVER);
239 } catch (final SecurityException e) {
240 this.changeStatus(Account.State.SECURITY_ERROR);
241 } catch (final UnauthorizedException e) {
242 this.changeStatus(Account.State.UNAUTHORIZED);
243 } catch (final UnknownHostException | ConnectException e) {
244 this.changeStatus(Account.State.SERVER_NOT_FOUND);
245 } catch (final IOException | XmlPullParserException | NoSuchAlgorithmException e) {
246 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": " + e.getMessage());
247 this.changeStatus(Account.State.OFFLINE);
248 this.attempt--; //don't count attempt when reconnecting instantly anyway
249 } finally {
250 if (socket != null) {
251 try {
252 socket.close();
253 } catch (IOException e) {
254
255 }
256 }
257 if (wakeLock.isHeld()) {
258 try {
259 wakeLock.release();
260 } catch (final RuntimeException ignored) {
261 }
262 }
263 }
264 }
265
266 @Override
267 public void run() {
268 try {
269 if (socket != null) {
270 socket.close();
271 }
272 } catch (final IOException ignored) {
273
274 }
275 connect();
276 }
277
278 private void processStream(final Tag currentTag) throws XmlPullParserException,
279 IOException, NoSuchAlgorithmException {
280 Tag nextTag = tagReader.readTag();
281
282 while ((nextTag != null) && (!nextTag.isEnd("stream"))) {
283 if (nextTag.isStart("error")) {
284 processStreamError(nextTag);
285 } else if (nextTag.isStart("features")) {
286 processStreamFeatures(nextTag);
287 } else if (nextTag.isStart("proceed")) {
288 switchOverToTls(nextTag);
289 } else if (nextTag.isStart("success")) {
290 final String challenge = tagReader.readElement(nextTag).getContent();
291 try {
292 saslMechanism.getResponse(challenge);
293 } catch (final SaslMechanism.AuthenticationException e) {
294 disconnect(true);
295 Log.e(Config.LOGTAG, String.valueOf(e));
296 }
297 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": logged in");
298 account.setKey(Account.PINNED_MECHANISM_KEY,
299 String.valueOf(saslMechanism.getPriority()));
300 tagReader.reset();
301 sendStartStream();
302 processStream(tagReader.readTag());
303 break;
304 } else if (nextTag.isStart("failure")) {
305 throw new UnauthorizedException();
306 } else if (nextTag.isStart("challenge")) {
307 final String challenge = tagReader.readElement(nextTag).getContent();
308 final Element response = new Element("response");
309 response.setAttribute("xmlns",
310 "urn:ietf:params:xml:ns:xmpp-sasl");
311 try {
312 response.setContent(saslMechanism.getResponse(challenge));
313 } catch (final SaslMechanism.AuthenticationException e) {
314 // TODO: Send auth abort tag.
315 Log.e(Config.LOGTAG, e.toString());
316 }
317 tagWriter.writeElement(response);
318 } else if (nextTag.isStart("enabled")) {
319 final Element enabled = tagReader.readElement(nextTag);
320 if ("true".equals(enabled.getAttribute("resume"))) {
321 this.streamId = enabled.getAttribute("id");
322 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
323 + ": stream managment(" + smVersion
324 + ") enabled (resumable)");
325 } else {
326 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
327 + ": stream managment(" + smVersion + ") enabled");
328 }
329 this.lastSessionStarted = SystemClock.elapsedRealtime();
330 this.stanzasReceived = 0;
331 final RequestPacket r = new RequestPacket(smVersion);
332 tagWriter.writeStanzaAsync(r);
333 } else if (nextTag.isStart("resumed")) {
334 lastPacketReceived = SystemClock.elapsedRealtime();
335 final Element resumed = tagReader.readElement(nextTag);
336 final String h = resumed.getAttribute("h");
337 try {
338 final int serverCount = Integer.parseInt(h);
339 if (serverCount != stanzasSent) {
340 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
341 + ": session resumed with lost packages");
342 stanzasSent = serverCount;
343 } else {
344 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
345 + ": session resumed");
346 }
347 if (acknowledgedListener != null) {
348 for (int i = 0; i < messageReceipts.size(); ++i) {
349 if (serverCount >= messageReceipts.keyAt(i)) {
350 acknowledgedListener.onMessageAcknowledged(
351 account, messageReceipts.valueAt(i));
352 }
353 }
354 }
355 messageReceipts.clear();
356 } catch (final NumberFormatException ignored) {
357 }
358 sendServiceDiscoveryInfo(account.getServer());
359 sendServiceDiscoveryInfo(account.getJid().toBareJid());
360 sendServiceDiscoveryItems(account.getServer());
361 sendInitialPing();
362 } else if (nextTag.isStart("r")) {
363 tagReader.readElement(nextTag);
364 if (Config.EXTENDED_SM_LOGGING) {
365 Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": acknowledging stanza #" + this.stanzasReceived);
366 }
367 final AckPacket ack = new AckPacket(this.stanzasReceived, smVersion);
368 tagWriter.writeStanzaAsync(ack);
369 } else if (nextTag.isStart("a")) {
370 final Element ack = tagReader.readElement(nextTag);
371 lastPacketReceived = SystemClock.elapsedRealtime();
372 try {
373 final int serverSequence = Integer.parseInt(ack.getAttribute("h"));
374 if (Config.EXTENDED_SM_LOGGING) {
375 Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": server acknowledged stanza #" + serverSequence);
376 }
377 final String msgId = this.messageReceipts.get(serverSequence);
378 if (msgId != null) {
379 if (this.acknowledgedListener != null) {
380 this.acknowledgedListener.onMessageAcknowledged(
381 account, msgId);
382 }
383 this.messageReceipts.remove(serverSequence);
384 }
385 } catch (NumberFormatException e) {
386 Log.d(Config.LOGTAG,account.getJid().toBareJid()+": server send ack without sequence number");
387 }
388 } else if (nextTag.isStart("failed")) {
389 tagReader.readElement(nextTag);
390 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": resumption failed");
391 streamId = null;
392 if (account.getStatus() != Account.State.ONLINE) {
393 sendBindRequest();
394 }
395 } else if (nextTag.isStart("iq")) {
396 processIq(nextTag);
397 } else if (nextTag.isStart("message")) {
398 processMessage(nextTag);
399 } else if (nextTag.isStart("presence")) {
400 processPresence(nextTag);
401 }
402 nextTag = tagReader.readTag();
403 }
404 if (account.getStatus() == Account.State.ONLINE) {
405 account. setStatus(Account.State.OFFLINE);
406 if (statusListener != null) {
407 statusListener.onStatusChanged(account);
408 }
409 }
410 }
411
412 private void sendInitialPing() {
413 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": sending intial ping");
414 final IqPacket iq = new IqPacket(IqPacket.TYPE.GET);
415 iq.setFrom(account.getJid());
416 iq.addChild("ping", "urn:xmpp:ping");
417 this.sendIqPacket(iq, new OnIqPacketReceived() {
418 @Override
419 public void onIqPacketReceived(final Account account, final IqPacket packet) {
420 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
421 + ": online with resource " + account.getResource());
422 changeStatus(Account.State.ONLINE);
423 }
424 });
425 }
426
427 private Element processPacket(final Tag currentTag, final int packetType)
428 throws XmlPullParserException, IOException {
429 Element element;
430 switch (packetType) {
431 case PACKET_IQ:
432 element = new IqPacket();
433 break;
434 case PACKET_MESSAGE:
435 element = new MessagePacket();
436 break;
437 case PACKET_PRESENCE:
438 element = new PresencePacket();
439 break;
440 default:
441 return null;
442 }
443 element.setAttributes(currentTag.getAttributes());
444 Tag nextTag = tagReader.readTag();
445 if (nextTag == null) {
446 throw new IOException("interrupted mid tag");
447 }
448 while (!nextTag.isEnd(element.getName())) {
449 if (!nextTag.isNo()) {
450 final Element child = tagReader.readElement(nextTag);
451 final String type = currentTag.getAttribute("type");
452 if (packetType == PACKET_IQ
453 && "jingle".equals(child.getName())
454 && ("set".equalsIgnoreCase(type) || "get"
455 .equalsIgnoreCase(type))) {
456 element = new JinglePacket();
457 element.setAttributes(currentTag.getAttributes());
458 }
459 element.addChild(child);
460 }
461 nextTag = tagReader.readTag();
462 if (nextTag == null) {
463 throw new IOException("interrupted mid tag");
464 }
465 }
466 if (stanzasReceived == Integer.MAX_VALUE) {
467 resetStreamId();
468 throw new IOException("time to restart the session. cant handle >2 billion pcks");
469 }
470 ++stanzasReceived;
471 lastPacketReceived = SystemClock.elapsedRealtime();
472 return element;
473 }
474
475 private void processIq(final Tag currentTag) throws XmlPullParserException, IOException {
476 final IqPacket packet = (IqPacket) processPacket(currentTag, PACKET_IQ);
477
478 if (packet.getId() == null) {
479 return; // an iq packet without id is definitely invalid
480 }
481
482 if (packet instanceof JinglePacket) {
483 if (this.jingleListener != null) {
484 this.jingleListener.onJinglePacketReceived(account,(JinglePacket) packet);
485 }
486 } else {
487 if (packetCallbacks.containsKey(packet.getId())) {
488 final Pair<IqPacket, OnIqPacketReceived> packetCallbackDuple = packetCallbacks.get(packet.getId());
489 // Packets to the server should have responses from the server
490 if (packetCallbackDuple.first.toServer(account)) {
491 if (packet.fromServer(account)) {
492 packetCallbackDuple.second.onIqPacketReceived(account, packet);
493 packetCallbacks.remove(packet.getId());
494 } else {
495 Log.e(Config.LOGTAG,account.getJid().toBareJid().toString()+": ignoring spoofed iq packet");
496 }
497 } else {
498 if (packet.getFrom().equals(packetCallbackDuple.first.getTo())) {
499 packetCallbackDuple.second.onIqPacketReceived(account, packet);
500 packetCallbacks.remove(packet.getId());
501 } else {
502 Log.e(Config.LOGTAG,account.getJid().toBareJid().toString()+": ignoring spoofed iq packet");
503 }
504 }
505 } else if (packet.getType() == IqPacket.TYPE.GET|| packet.getType() == IqPacket.TYPE.SET) {
506 this.unregisteredIqListener.onIqPacketReceived(account, packet);
507 }
508 }
509 }
510
511 private void processMessage(final Tag currentTag) throws XmlPullParserException, IOException {
512 final MessagePacket packet = (MessagePacket) processPacket(currentTag,PACKET_MESSAGE);
513 this.messageListener.onMessagePacketReceived(account, packet);
514 }
515
516 private void processPresence(final Tag currentTag) throws XmlPullParserException, IOException {
517 PresencePacket packet = (PresencePacket) processPacket(currentTag, PACKET_PRESENCE);
518 this.presenceListener.onPresencePacketReceived(account, packet);
519 }
520
521 private void sendStartTLS() throws IOException {
522 final Tag startTLS = Tag.empty("starttls");
523 startTLS.setAttribute("xmlns", "urn:ietf:params:xml:ns:xmpp-tls");
524 tagWriter.writeTag(startTLS);
525 }
526
527 private SharedPreferences getPreferences() {
528 return PreferenceManager.getDefaultSharedPreferences(applicationContext);
529 }
530
531 private boolean enableLegacySSL() {
532 return getPreferences().getBoolean("enable_legacy_ssl", false);
533 }
534
535 private void switchOverToTls(final Tag currentTag) throws XmlPullParserException, IOException {
536 tagReader.readTag();
537 try {
538 final SSLContext sc = SSLContext.getInstance("TLS");
539 sc.init(null,new X509TrustManager[]{this.mXmppConnectionService.getMemorizingTrustManager()},mXmppConnectionService.getRNG());
540 final SSLSocketFactory factory = sc.getSocketFactory();
541 final HostnameVerifier verifier = this.mXmppConnectionService.getMemorizingTrustManager().wrapHostnameVerifier(new StrictHostnameVerifier());
542 final InetAddress address = socket == null ? null : socket.getInetAddress();
543
544 if (factory == null || address == null || verifier == null) {
545 throw new IOException("could not setup ssl");
546 }
547
548 final SSLSocket sslSocket = (SSLSocket) factory.createSocket(socket,address.getHostAddress(), socket.getPort(),true);
549
550 if (sslSocket == null) {
551 throw new IOException("could not initialize ssl socket");
552 }
553
554 final String[] supportProtocols;
555 final Collection<String> supportedProtocols = new LinkedList<>(
556 Arrays.asList(sslSocket.getSupportedProtocols()));
557 supportedProtocols.remove("SSLv3");
558 supportProtocols = supportedProtocols.toArray(new String[supportedProtocols.size()]);
559
560 sslSocket.setEnabledProtocols(supportProtocols);
561
562 final String[] cipherSuites = CryptoHelper.getOrderedCipherSuites(
563 sslSocket.getSupportedCipherSuites());
564 //Log.d(Config.LOGTAG, "Using ciphers: " + Arrays.toString(cipherSuites));
565 if (cipherSuites.length > 0) {
566 sslSocket.setEnabledCipherSuites(cipherSuites);
567 }
568
569 if (!verifier.verify(account.getServer().getDomainpart(),sslSocket.getSession())) {
570 Log.d(Config.LOGTAG,account.getJid().toBareJid()+": TLS certificate verification failed");
571 throw new SecurityException();
572 }
573 tagReader.setInputStream(sslSocket.getInputStream());
574 tagWriter.setOutputStream(sslSocket.getOutputStream());
575 sendStartStream();
576 Log.d(Config.LOGTAG, account.getJid().toBareJid()+ ": TLS connection established");
577 features.encryptionEnabled = true;
578 processStream(tagReader.readTag());
579 sslSocket.close();
580 } catch (final NoSuchAlgorithmException | KeyManagementException e1) {
581 Log.d(Config.LOGTAG,account.getJid().toBareJid()+": TLS certificate verification failed");
582 throw new SecurityException();
583 }
584 }
585
586 private void processStreamFeatures(final Tag currentTag)
587 throws XmlPullParserException, IOException {
588 this.streamFeatures = tagReader.readElement(currentTag);
589 if (this.streamFeatures.hasChild("starttls") && !features.encryptionEnabled) {
590 sendStartTLS();
591 } else if (this.streamFeatures.hasChild("register")
592 && account.isOptionSet(Account.OPTION_REGISTER)
593 && features.encryptionEnabled) {
594 sendRegistryRequest();
595 } else if (!this.streamFeatures.hasChild("register")
596 && account.isOptionSet(Account.OPTION_REGISTER)) {
597 changeStatus(Account.State.REGISTRATION_NOT_SUPPORTED);
598 disconnect(true);
599 } else if (this.streamFeatures.hasChild("mechanisms")
600 && shouldAuthenticate && features.encryptionEnabled) {
601 final List<String> mechanisms = extractMechanisms(streamFeatures
602 .findChild("mechanisms"));
603 final Element auth = new Element("auth");
604 auth.setAttribute("xmlns", "urn:ietf:params:xml:ns:xmpp-sasl");
605 if (mechanisms.contains("SCRAM-SHA-1")) {
606 saslMechanism = new ScramSha1(tagWriter, account, mXmppConnectionService.getRNG());
607 } else if (mechanisms.contains("PLAIN")) {
608 saslMechanism = new Plain(tagWriter, account);
609 } else if (mechanisms.contains("DIGEST-MD5")) {
610 saslMechanism = new DigestMd5(tagWriter, account, mXmppConnectionService.getRNG());
611 }
612 if (saslMechanism != null) {
613 final JSONObject keys = account.getKeys();
614 try {
615 if (keys.has(Account.PINNED_MECHANISM_KEY) &&
616 keys.getInt(Account.PINNED_MECHANISM_KEY) > saslMechanism.getPriority()) {
617 Log.e(Config.LOGTAG, "Auth failed. Authentication mechanism " + saslMechanism.getMechanism() +
618 " has lower priority (" + String.valueOf(saslMechanism.getPriority()) +
619 ") than pinned priority (" + keys.getInt(Account.PINNED_MECHANISM_KEY) +
620 "). Possible downgrade attack?");
621 throw new SecurityException();
622 }
623 } catch (final JSONException e) {
624 Log.d(Config.LOGTAG, "Parse error while checking pinned auth mechanism");
625 }
626 Log.d(Config.LOGTAG, account.getJid().toString() + ": Authenticating with " + saslMechanism.getMechanism());
627 auth.setAttribute("mechanism", saslMechanism.getMechanism());
628 if (!saslMechanism.getClientFirstMessage().isEmpty()) {
629 auth.setContent(saslMechanism.getClientFirstMessage());
630 }
631 tagWriter.writeElement(auth);
632 } else {
633 throw new IncompatibleServerException();
634 }
635 } else if (this.streamFeatures.hasChild("sm", "urn:xmpp:sm:"
636 + smVersion)
637 && streamId != null) {
638 if (Config.EXTENDED_SM_LOGGING) {
639 Log.d(Config.LOGTAG,account.getJid().toBareJid()+": resuming after stanza #"+stanzasReceived);
640 }
641 final ResumePacket resume = new ResumePacket(this.streamId, stanzasReceived, smVersion);
642 this.tagWriter.writeStanzaAsync(resume);
643 } else if (this.streamFeatures.hasChild("bind") && shouldBind) {
644 sendBindRequest();
645 } else {
646 disconnect(true);
647 changeStatus(Account.State.INCOMPATIBLE_SERVER);
648 }
649 }
650
651 private List<String> extractMechanisms(final Element stream) {
652 final ArrayList<String> mechanisms = new ArrayList<>(stream
653 .getChildren().size());
654 for (final Element child : stream.getChildren()) {
655 mechanisms.add(child.getContent());
656 }
657 return mechanisms;
658 }
659
660 private void sendRegistryRequest() {
661 final IqPacket register = new IqPacket(IqPacket.TYPE.GET);
662 register.query("jabber:iq:register");
663 register.setTo(account.getServer());
664 sendIqPacket(register, new OnIqPacketReceived() {
665
666 @Override
667 public void onIqPacketReceived(final Account account, final IqPacket packet) {
668 final Element instructions = packet.query().findChild("instructions");
669 if (packet.query().hasChild("username")
670 && (packet.query().hasChild("password"))) {
671 final IqPacket register = new IqPacket(IqPacket.TYPE.SET);
672 final Element username = new Element("username").setContent(account.getUsername());
673 final Element password = new Element("password").setContent(account.getPassword());
674 register.query("jabber:iq:register").addChild(username);
675 register.query().addChild(password);
676 sendIqPacket(register, new OnIqPacketReceived() {
677
678 @Override
679 public void onIqPacketReceived(final Account account, final IqPacket packet) {
680 if (packet.getType() == IqPacket.TYPE.RESULT) {
681 account.setOption(Account.OPTION_REGISTER,
682 false);
683 changeStatus(Account.State.REGISTRATION_SUCCESSFUL);
684 } else if (packet.hasChild("error")
685 && (packet.findChild("error")
686 .hasChild("conflict"))) {
687 changeStatus(Account.State.REGISTRATION_CONFLICT);
688 } else {
689 changeStatus(Account.State.REGISTRATION_FAILED);
690 Log.d(Config.LOGTAG, packet.toString());
691 }
692 disconnect(true);
693 }
694 });
695 } else {
696 changeStatus(Account.State.REGISTRATION_FAILED);
697 disconnect(true);
698 Log.d(Config.LOGTAG, account.getJid().toBareJid()
699 + ": could not register. instructions are"
700 + (instructions != null ? instructions.getContent() : ""));
701 }
702 }
703 });
704 }
705
706 private void sendBindRequest() {
707 while(!mXmppConnectionService.areMessagesInitialized()) {
708 try {
709 Thread.sleep(500);
710 } catch (final InterruptedException ignored) {
711 }
712 }
713 clearIqCallbacks();
714 final IqPacket iq = new IqPacket(IqPacket.TYPE.SET);
715 iq.addChild("bind", "urn:ietf:params:xml:ns:xmpp-bind")
716 .addChild("resource").setContent(account.getResource());
717 this.sendUnmodifiedIqPacket(iq, new OnIqPacketReceived() {
718 @Override
719 public void onIqPacketReceived(final Account account, final IqPacket packet) {
720 final Element bind = packet.findChild("bind");
721 if (bind != null) {
722 final Element jid = bind.findChild("jid");
723 if (jid != null && jid.getContent() != null) {
724 try {
725 account.setResource(Jid.fromString(jid.getContent()).getResourcepart());
726 } catch (final InvalidJidException e) {
727 // TODO: Handle the case where an external JID is technically invalid?
728 }
729 if (streamFeatures.hasChild("session")) {
730 sendStartSession();
731 } else {
732 sendPostBindInitialization();
733 }
734 } else {
735 disconnect(true);
736 }
737 } else {
738 disconnect(true);
739 }
740 }
741 });
742 }
743
744 private void clearIqCallbacks() {
745 Log.d(Config.LOGTAG,account.getJid().toBareJid()+": clearing iq iq callbacks");
746 final IqPacket failurePacket = new IqPacket(IqPacket.TYPE.ERROR);
747 Iterator<Entry<String, Pair<IqPacket, OnIqPacketReceived>>> iterator = this.packetCallbacks.entrySet().iterator();
748 while(iterator.hasNext()) {
749 Entry<String, Pair<IqPacket, OnIqPacketReceived>> entry = iterator.next();
750 entry.getValue().second.onIqPacketReceived(account,failurePacket);
751 iterator.remove();
752 }
753 }
754
755 private void sendStartSession() {
756 final IqPacket startSession = new IqPacket(IqPacket.TYPE.SET);
757 startSession.addChild("session","urn:ietf:params:xml:ns:xmpp-session");
758 this.sendUnmodifiedIqPacket(startSession, new OnIqPacketReceived() {
759 @Override
760 public void onIqPacketReceived(Account account, IqPacket packet) {
761 if (packet.getType() == IqPacket.TYPE.RESULT) {
762 sendPostBindInitialization();
763 } else {
764 disconnect(true);
765 }
766 }
767 });
768 }
769
770 private void sendPostBindInitialization() {
771 smVersion = 0;
772 if (streamFeatures.hasChild("sm", "urn:xmpp:sm:3")) {
773 smVersion = 3;
774 } else if (streamFeatures.hasChild("sm", "urn:xmpp:sm:2")) {
775 smVersion = 2;
776 }
777 if (smVersion != 0) {
778 final EnablePacket enable = new EnablePacket(smVersion);
779 tagWriter.writeStanzaAsync(enable);
780 stanzasSent = 0;
781 messageReceipts.clear();
782 }
783 features.carbonsEnabled = false;
784 features.blockListRequested = false;
785 disco.clear();
786 sendServiceDiscoveryInfo(account.getServer());
787 sendServiceDiscoveryInfo(account.getJid().toBareJid());
788 sendServiceDiscoveryItems(account.getServer());
789 if (bindListener != null) {
790 bindListener.onBind(account);
791 }
792 sendInitialPing();
793 }
794
795 private void sendServiceDiscoveryInfo(final Jid jid) {
796 if (disco.containsKey(jid)) {
797 if (account.getServer().equals(jid)) {
798 enableAdvancedStreamFeatures();
799 }
800 } else {
801 final IqPacket iq = new IqPacket(IqPacket.TYPE.GET);
802 iq.setTo(jid);
803 iq.query("http://jabber.org/protocol/disco#info");
804 this.sendIqPacket(iq, new OnIqPacketReceived() {
805
806 @Override
807 public void onIqPacketReceived(final Account account, final IqPacket packet) {
808 final List<Element> elements = packet.query().getChildren();
809 final Info info = new Info();
810 for (final Element element : elements) {
811 if (element.getName().equals("identity")) {
812 String type = element.getAttribute("type");
813 String category = element.getAttribute("category");
814 if (type != null && category != null) {
815 info.identities.add(new Pair<>(category,type));
816 }
817 } else if (element.getName().equals("feature")) {
818 info.features.add(element.getAttribute("var"));
819 }
820 }
821 disco.put(jid, info);
822
823 if (account.getServer().equals(jid)) {
824 enableAdvancedStreamFeatures();
825 for (final OnAdvancedStreamFeaturesLoaded listener : advancedStreamFeaturesLoadedListeners) {
826 listener.onAdvancedStreamFeaturesAvailable(account);
827 }
828 }
829 }
830 });
831 }
832 }
833
834 private void enableAdvancedStreamFeatures() {
835 if (getFeatures().carbons() && !features.carbonsEnabled) {
836 sendEnableCarbons();
837 }
838 if (getFeatures().blocking() && !features.blockListRequested) {
839 Log.d(Config.LOGTAG,account.getJid().toBareJid()+": Requesting block list");
840 this.sendIqPacket(getIqGenerator().generateGetBlockList(), mXmppConnectionService.getIqParser());
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(final Account account, final IqPacket packet) {
852 final List<Element> elements = packet.query().getChildren();
853 for (final Element element : elements) {
854 if (element.getName().equals("item")) {
855 final Jid jid = element.getAttributeAsJid("jid");
856 if (jid != null && !jid.equals(account.getServer())) {
857 sendServiceDiscoveryInfo(jid);
858 }
859 }
860 }
861 }
862 });
863 }
864
865 private void sendEnableCarbons() {
866 final IqPacket iq = new IqPacket(IqPacket.TYPE.SET);
867 iq.addChild("enable", "urn:xmpp:carbons:2");
868 this.sendIqPacket(iq, new OnIqPacketReceived() {
869
870 @Override
871 public void onIqPacketReceived(final Account account, final IqPacket packet) {
872 if (!packet.hasChild("error")) {
873 Log.d(Config.LOGTAG, account.getJid().toBareJid()
874 + ": successfully enabled carbons");
875 features.carbonsEnabled = true;
876 } else {
877 Log.d(Config.LOGTAG, account.getJid().toBareJid()
878 + ": error enableing carbons " + packet.toString());
879 }
880 }
881 });
882 }
883
884 private void processStreamError(final Tag currentTag)
885 throws XmlPullParserException, IOException {
886 final Element streamError = tagReader.readElement(currentTag);
887 if (streamError != null && streamError.hasChild("conflict")) {
888 final String resource = account.getResource().split("\\.")[0];
889 account.setResource(resource + "." + nextRandomId());
890 Log.d(Config.LOGTAG,
891 account.getJid().toBareJid() + ": switching resource due to conflict ("
892 + account.getResource() + ")");
893 }
894 }
895
896 private void sendStartStream() throws IOException {
897 final Tag stream = Tag.start("stream:stream");
898 stream.setAttribute("from", account.getJid().toBareJid().toString());
899 stream.setAttribute("to", account.getServer().toString());
900 stream.setAttribute("version", "1.0");
901 stream.setAttribute("xml:lang", "en");
902 stream.setAttribute("xmlns", "jabber:client");
903 stream.setAttribute("xmlns:stream", "http://etherx.jabber.org/streams");
904 tagWriter.writeTag(stream);
905 }
906
907 private String nextRandomId() {
908 return new BigInteger(50, mXmppConnectionService.getRNG()).toString(32);
909 }
910
911 public void sendIqPacket(final IqPacket packet, final OnIqPacketReceived callback) {
912 packet.setFrom(account.getJid());
913 this.sendUnmodifiedIqPacket(packet,callback);
914
915 }
916
917 private synchronized void sendUnmodifiedIqPacket(final IqPacket packet, final OnIqPacketReceived callback) {
918 if (packet.getId() == null) {
919 final String id = nextRandomId();
920 packet.setAttribute("id", id);
921 }
922 if (callback != null) {
923 if (packet.getId() == null) {
924 packet.setId(nextRandomId());
925 }
926 packetCallbacks.put(packet.getId(), new Pair<>(packet, callback));
927 }
928 this.sendPacket(packet);
929 }
930
931 public void sendMessagePacket(final MessagePacket packet) {
932 this.sendPacket(packet);
933 }
934
935 public void sendPresencePacket(final PresencePacket packet) {
936 this.sendPacket(packet);
937 }
938
939 private synchronized void sendPacket(final AbstractStanza packet) {
940 if (stanzasSent == Integer.MAX_VALUE) {
941 resetStreamId();
942 disconnect(true);
943 return;
944 }
945 final String name = packet.getName();
946 if (name.equals("iq") || name.equals("message") || name.equals("presence")) {
947 ++stanzasSent;
948 }
949 tagWriter.writeStanzaAsync(packet);
950 if (packet instanceof MessagePacket && packet.getId() != null && getFeatures().sm()) {
951 if (Config.EXTENDED_SM_LOGGING) {
952 Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": requesting ack for message stanza #" + stanzasSent);
953 }
954 this.messageReceipts.put(stanzasSent, packet.getId());
955 tagWriter.writeStanzaAsync(new RequestPacket(this.smVersion));
956 }
957 }
958
959 public void sendPing() {
960 if (streamFeatures.hasChild("sm")) {
961 tagWriter.writeStanzaAsync(new RequestPacket(smVersion));
962 } else {
963 final 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 final OnMessagePacketReceived listener) {
973 this.messageListener = listener;
974 }
975
976 public void setOnUnregisteredIqPacketReceivedListener(
977 final OnIqPacketReceived listener) {
978 this.unregisteredIqListener = listener;
979 }
980
981 public void setOnPresencePacketReceivedListener(
982 final OnPresencePacketReceived listener) {
983 this.presenceListener = listener;
984 }
985
986 public void setOnJinglePacketReceivedListener(
987 final OnJinglePacketReceived listener) {
988 this.jingleListener = listener;
989 }
990
991 public void setOnStatusChangedListener(final OnStatusChanged listener) {
992 this.statusListener = listener;
993 }
994
995 public void setOnBindListener(final OnBindListener listener) {
996 this.bindListener = listener;
997 }
998
999 public void setOnMessageAcknowledgeListener(final OnMessageAcknowledged listener) {
1000 this.acknowledgedListener = listener;
1001 }
1002
1003 public void addOnAdvancedStreamFeaturesAvailableListener(final OnAdvancedStreamFeaturesLoaded listener) {
1004 if (!this.advancedStreamFeaturesLoadedListeners.contains(listener)) {
1005 this.advancedStreamFeaturesLoadedListeners.add(listener);
1006 }
1007 }
1008
1009 public void disconnect(final boolean force) {
1010 Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": disconnecting");
1011 try {
1012 if (force) {
1013 socket.close();
1014 return;
1015 }
1016 new Thread(new Runnable() {
1017
1018 @Override
1019 public void run() {
1020 if (tagWriter.isActive()) {
1021 tagWriter.finish();
1022 try {
1023 while (!tagWriter.finished()) {
1024 Log.d(Config.LOGTAG, "not yet finished");
1025 Thread.sleep(100);
1026 }
1027 tagWriter.writeTag(Tag.end("stream:stream"));
1028 socket.close();
1029 } catch (final IOException e) {
1030 Log.d(Config.LOGTAG,
1031 "io exception during disconnect");
1032 } catch (final InterruptedException e) {
1033 Log.d(Config.LOGTAG, "interrupted");
1034 }
1035 }
1036 }
1037 }).start();
1038 } catch (final IOException e) {
1039 Log.d(Config.LOGTAG, "io exception during disconnect");
1040 }
1041 }
1042
1043 public void resetStreamId() {
1044 this.streamId = null;
1045 }
1046
1047 public List<Jid> findDiscoItemsByFeature(final String feature) {
1048 final List<Jid> items = new ArrayList<>();
1049 for (final Entry<Jid, Info> cursor : disco.entrySet()) {
1050 if (cursor.getValue().features.contains(feature)) {
1051 items.add(cursor.getKey());
1052 }
1053 }
1054 return items;
1055 }
1056
1057 public Jid findDiscoItemByFeature(final String feature) {
1058 final List<Jid> items = findDiscoItemsByFeature(feature);
1059 if (items.size() >= 1) {
1060 return items.get(0);
1061 }
1062 return null;
1063 }
1064
1065 public void r() {
1066 this.tagWriter.writeStanzaAsync(new RequestPacket(smVersion));
1067 }
1068
1069 public String getMucServer() {
1070 for (final Entry<Jid, Info> cursor : disco.entrySet()) {
1071 final Info value = cursor.getValue();
1072 if (value.features.contains("http://jabber.org/protocol/muc")
1073 && !value.features.contains("jabber:iq:gateway")
1074 && !value.identities.contains(new Pair<>("conference","irc"))) {
1075 return cursor.getKey().toString();
1076 }
1077 }
1078 return null;
1079 }
1080
1081 public int getTimeToNextAttempt() {
1082 final int interval = (int) (25 * Math.pow(1.5, attempt));
1083 final int secondsSinceLast = (int) ((SystemClock.elapsedRealtime() - this.lastConnect) / 1000);
1084 return interval - secondsSinceLast;
1085 }
1086
1087 public int getAttempt() {
1088 return this.attempt;
1089 }
1090
1091 public Features getFeatures() {
1092 return this.features;
1093 }
1094
1095 public long getLastSessionEstablished() {
1096 final long diff;
1097 if (this.lastSessionStarted == 0) {
1098 diff = SystemClock.elapsedRealtime() - this.lastConnect;
1099 } else {
1100 diff = SystemClock.elapsedRealtime() - this.lastSessionStarted;
1101 }
1102 return System.currentTimeMillis() - diff;
1103 }
1104
1105 public long getLastConnect() {
1106 return this.lastConnect;
1107 }
1108
1109 public long getLastPingSent() {
1110 return this.lastPingSent;
1111 }
1112
1113 public long getLastPacketReceived() {
1114 return this.lastPacketReceived;
1115 }
1116
1117 public void sendActive() {
1118 this.sendPacket(new ActivePacket());
1119 }
1120
1121 public void sendInactive() {
1122 this.sendPacket(new InactivePacket());
1123 }
1124
1125 public void resetAttemptCount() {
1126 this.attempt = 0;
1127 this.lastConnect = 0;
1128 }
1129
1130 private class Info {
1131 public final ArrayList<String> features = new ArrayList<>();
1132 public final ArrayList<Pair<String,String>> identities = new ArrayList<>();
1133 }
1134
1135 private class UnauthorizedException extends IOException {
1136
1137 }
1138
1139 private class SecurityException extends IOException {
1140
1141 }
1142
1143 private class IncompatibleServerException extends IOException {
1144
1145 }
1146
1147 public class Features {
1148 XmppConnection connection;
1149 private boolean carbonsEnabled = false;
1150 private boolean encryptionEnabled = false;
1151 private boolean blockListRequested = false;
1152
1153 public Features(final XmppConnection connection) {
1154 this.connection = connection;
1155 }
1156
1157 private boolean hasDiscoFeature(final Jid server, final String feature) {
1158 return connection.disco.containsKey(server) &&
1159 connection.disco.get(server).features.contains(feature);
1160 }
1161
1162 public boolean carbons() {
1163 return hasDiscoFeature(account.getServer(), "urn:xmpp:carbons:2");
1164 }
1165
1166 public boolean blocking() {
1167 return hasDiscoFeature(account.getServer(), Xmlns.BLOCKING);
1168 }
1169
1170 public boolean register() {
1171 return hasDiscoFeature(account.getServer(), Xmlns.REGISTER);
1172 }
1173
1174 public boolean sm() {
1175 return streamId != null
1176 || (connection.streamFeatures != null && connection.streamFeatures.hasChild("sm"));
1177 }
1178
1179 public boolean csi() {
1180 return connection.streamFeatures != null && connection.streamFeatures.hasChild("csi", "urn:xmpp:csi:0");
1181 }
1182
1183 public boolean pep() {
1184 final Pair<String,String> needle = new Pair<>("pubsub","pep");
1185 Info info = disco.get(account.getServer());
1186 if (info != null && info.identities.contains(needle)) {
1187 return true;
1188 } else {
1189 info = disco.get(account.getJid().toBareJid());
1190 return info != null && info.identities.contains(needle);
1191 }
1192 }
1193
1194 public boolean mam() {
1195 if (hasDiscoFeature(account.getJid().toBareJid(), "urn:xmpp:mam:0")) {
1196 return true;
1197 } else {
1198 return hasDiscoFeature(account.getServer(), "urn:xmpp:mam:0");
1199 }
1200 }
1201
1202 public boolean advancedStreamFeaturesLoaded() {
1203 return disco.containsKey(account.getServer());
1204 }
1205
1206 public boolean rosterVersioning() {
1207 return connection.streamFeatures != null && connection.streamFeatures.hasChild("ver");
1208 }
1209
1210 public void setBlockListRequested(boolean value) {
1211 this.blockListRequested = value;
1212 }
1213
1214 public boolean httpUpload() {
1215 return findDiscoItemsByFeature(Xmlns.HTTP_UPLOAD).size() > 0;
1216 }
1217 }
1218
1219 private IqGenerator getIqGenerator() {
1220 return mXmppConnectionService.getIqGenerator();
1221 }
1222}