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> mStanzaReceipts = 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() + ": session resumed");
345 }
346 acknowledgeStanzaUpTo(serverCount);
347 ArrayList<IqPacket> failedIqPackets = new ArrayList<>();
348 for(int i = 0; i < this.mStanzaReceipts.size(); ++i) {
349 String id = mStanzaReceipts.valueAt(i);
350 Pair<IqPacket,OnIqPacketReceived> pair = id == null ? null : this.packetCallbacks.get(id);
351 if (pair != null) {
352 failedIqPackets.add(pair.first);
353 }
354 }
355 mStanzaReceipts.clear();
356 Log.d(Config.LOGTAG,"resending "+failedIqPackets.size()+" iq stanza");
357 for(IqPacket packet : failedIqPackets) {
358 sendUnmodifiedIqPacket(packet,null);
359 }
360 } catch (final NumberFormatException ignored) {
361 }
362 sendInitialPing();
363 } else if (nextTag.isStart("r")) {
364 tagReader.readElement(nextTag);
365 if (Config.EXTENDED_SM_LOGGING) {
366 Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": acknowledging stanza #" + this.stanzasReceived);
367 }
368 final AckPacket ack = new AckPacket(this.stanzasReceived, smVersion);
369 tagWriter.writeStanzaAsync(ack);
370 } else if (nextTag.isStart("a")) {
371 final Element ack = tagReader.readElement(nextTag);
372 lastPacketReceived = SystemClock.elapsedRealtime();
373 try {
374 final int serverSequence = Integer.parseInt(ack.getAttribute("h"));
375 acknowledgeStanzaUpTo(serverSequence);
376 } catch (NumberFormatException e) {
377 Log.d(Config.LOGTAG,account.getJid().toBareJid()+": server send ack without sequence number");
378 }
379 } else if (nextTag.isStart("failed")) {
380 tagReader.readElement(nextTag);
381 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": resumption failed");
382 streamId = null;
383 if (account.getStatus() != Account.State.ONLINE) {
384 sendBindRequest();
385 }
386 } else if (nextTag.isStart("iq")) {
387 processIq(nextTag);
388 } else if (nextTag.isStart("message")) {
389 processMessage(nextTag);
390 } else if (nextTag.isStart("presence")) {
391 processPresence(nextTag);
392 }
393 nextTag = tagReader.readTag();
394 }
395 if (account.getStatus() == Account.State.ONLINE) {
396 account. setStatus(Account.State.OFFLINE);
397 if (statusListener != null) {
398 statusListener.onStatusChanged(account);
399 }
400 }
401 }
402
403 private void acknowledgeStanzaUpTo(int serverCount) {
404 for (int i = 0; i < mStanzaReceipts.size(); ++i) {
405 if (serverCount >= mStanzaReceipts.keyAt(i)) {
406 if (Config.EXTENDED_SM_LOGGING) {
407 Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": server acknowledged stanza #" + mStanzaReceipts.keyAt(i));
408 }
409 String id = mStanzaReceipts.valueAt(i);
410 if (acknowledgedListener != null) {
411 acknowledgedListener.onMessageAcknowledged(account, id);
412 }
413 mStanzaReceipts.removeAt(i);
414 i--;
415 }
416 }
417 }
418
419 private void sendInitialPing() {
420 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString() + ": sending intial ping");
421 final IqPacket iq = new IqPacket(IqPacket.TYPE.GET);
422 iq.setFrom(account.getJid());
423 iq.addChild("ping", "urn:xmpp:ping");
424 this.sendIqPacket(iq, new OnIqPacketReceived() {
425 @Override
426 public void onIqPacketReceived(final Account account, final IqPacket packet) {
427 Log.d(Config.LOGTAG, account.getJid().toBareJid().toString()
428 + ": online with resource " + account.getResource());
429 changeStatus(Account.State.ONLINE);
430 }
431 });
432 }
433
434 private Element processPacket(final Tag currentTag, final int packetType)
435 throws XmlPullParserException, IOException {
436 Element element;
437 switch (packetType) {
438 case PACKET_IQ:
439 element = new IqPacket();
440 break;
441 case PACKET_MESSAGE:
442 element = new MessagePacket();
443 break;
444 case PACKET_PRESENCE:
445 element = new PresencePacket();
446 break;
447 default:
448 return null;
449 }
450 element.setAttributes(currentTag.getAttributes());
451 Tag nextTag = tagReader.readTag();
452 if (nextTag == null) {
453 throw new IOException("interrupted mid tag");
454 }
455 while (!nextTag.isEnd(element.getName())) {
456 if (!nextTag.isNo()) {
457 final Element child = tagReader.readElement(nextTag);
458 final String type = currentTag.getAttribute("type");
459 if (packetType == PACKET_IQ
460 && "jingle".equals(child.getName())
461 && ("set".equalsIgnoreCase(type) || "get"
462 .equalsIgnoreCase(type))) {
463 element = new JinglePacket();
464 element.setAttributes(currentTag.getAttributes());
465 }
466 element.addChild(child);
467 }
468 nextTag = tagReader.readTag();
469 if (nextTag == null) {
470 throw new IOException("interrupted mid tag");
471 }
472 }
473 if (stanzasReceived == Integer.MAX_VALUE) {
474 resetStreamId();
475 throw new IOException("time to restart the session. cant handle >2 billion pcks");
476 }
477 ++stanzasReceived;
478 lastPacketReceived = SystemClock.elapsedRealtime();
479 return element;
480 }
481
482 private void processIq(final Tag currentTag) throws XmlPullParserException, IOException {
483 final IqPacket packet = (IqPacket) processPacket(currentTag, PACKET_IQ);
484
485 if (packet.getId() == null) {
486 return; // an iq packet without id is definitely invalid
487 }
488
489 if (packet instanceof JinglePacket) {
490 if (this.jingleListener != null) {
491 this.jingleListener.onJinglePacketReceived(account,(JinglePacket) packet);
492 }
493 } else {
494 if (packetCallbacks.containsKey(packet.getId())) {
495 final Pair<IqPacket, OnIqPacketReceived> packetCallbackDuple = packetCallbacks.get(packet.getId());
496 // Packets to the server should have responses from the server
497 if (packetCallbackDuple.first.toServer(account)) {
498 if (packet.fromServer(account)) {
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 } else {
505 if (packet.getFrom().equals(packetCallbackDuple.first.getTo())) {
506 packetCallbackDuple.second.onIqPacketReceived(account, packet);
507 packetCallbacks.remove(packet.getId());
508 } else {
509 Log.e(Config.LOGTAG,account.getJid().toBareJid().toString()+": ignoring spoofed iq packet");
510 }
511 }
512 } else if (packet.getType() == IqPacket.TYPE.GET|| packet.getType() == IqPacket.TYPE.SET) {
513 this.unregisteredIqListener.onIqPacketReceived(account, packet);
514 }
515 }
516 }
517
518 private void processMessage(final Tag currentTag) throws XmlPullParserException, IOException {
519 final MessagePacket packet = (MessagePacket) processPacket(currentTag,PACKET_MESSAGE);
520 this.messageListener.onMessagePacketReceived(account, packet);
521 }
522
523 private void processPresence(final Tag currentTag) throws XmlPullParserException, IOException {
524 PresencePacket packet = (PresencePacket) processPacket(currentTag, PACKET_PRESENCE);
525 this.presenceListener.onPresencePacketReceived(account, packet);
526 }
527
528 private void sendStartTLS() throws IOException {
529 final Tag startTLS = Tag.empty("starttls");
530 startTLS.setAttribute("xmlns", "urn:ietf:params:xml:ns:xmpp-tls");
531 tagWriter.writeTag(startTLS);
532 }
533
534 private SharedPreferences getPreferences() {
535 return PreferenceManager.getDefaultSharedPreferences(applicationContext);
536 }
537
538 private boolean enableLegacySSL() {
539 return getPreferences().getBoolean("enable_legacy_ssl", false);
540 }
541
542 private void switchOverToTls(final Tag currentTag) throws XmlPullParserException, IOException {
543 tagReader.readTag();
544 try {
545 final SSLContext sc = SSLContext.getInstance("TLS");
546 sc.init(null,new X509TrustManager[]{this.mXmppConnectionService.getMemorizingTrustManager()},mXmppConnectionService.getRNG());
547 final SSLSocketFactory factory = sc.getSocketFactory();
548 final HostnameVerifier verifier = this.mXmppConnectionService.getMemorizingTrustManager().wrapHostnameVerifier(new StrictHostnameVerifier());
549 final InetAddress address = socket == null ? null : socket.getInetAddress();
550
551 if (factory == null || address == null || verifier == null) {
552 throw new IOException("could not setup ssl");
553 }
554
555 final SSLSocket sslSocket = (SSLSocket) factory.createSocket(socket,address.getHostAddress(), socket.getPort(),true);
556
557 if (sslSocket == null) {
558 throw new IOException("could not initialize ssl socket");
559 }
560
561 final String[] supportProtocols;
562 final Collection<String> supportedProtocols = new LinkedList<>(
563 Arrays.asList(sslSocket.getSupportedProtocols()));
564 supportedProtocols.remove("SSLv3");
565 supportProtocols = supportedProtocols.toArray(new String[supportedProtocols.size()]);
566
567 sslSocket.setEnabledProtocols(supportProtocols);
568
569 final String[] cipherSuites = CryptoHelper.getOrderedCipherSuites(
570 sslSocket.getSupportedCipherSuites());
571 //Log.d(Config.LOGTAG, "Using ciphers: " + Arrays.toString(cipherSuites));
572 if (cipherSuites.length > 0) {
573 sslSocket.setEnabledCipherSuites(cipherSuites);
574 }
575
576 if (!verifier.verify(account.getServer().getDomainpart(),sslSocket.getSession())) {
577 Log.d(Config.LOGTAG,account.getJid().toBareJid()+": TLS certificate verification failed");
578 throw new SecurityException();
579 }
580 tagReader.setInputStream(sslSocket.getInputStream());
581 tagWriter.setOutputStream(sslSocket.getOutputStream());
582 sendStartStream();
583 Log.d(Config.LOGTAG, account.getJid().toBareJid()+ ": TLS connection established");
584 features.encryptionEnabled = true;
585 processStream(tagReader.readTag());
586 sslSocket.close();
587 } catch (final NoSuchAlgorithmException | KeyManagementException e1) {
588 Log.d(Config.LOGTAG,account.getJid().toBareJid()+": TLS certificate verification failed");
589 throw new SecurityException();
590 }
591 }
592
593 private void processStreamFeatures(final Tag currentTag)
594 throws XmlPullParserException, IOException {
595 this.streamFeatures = tagReader.readElement(currentTag);
596 if (this.streamFeatures.hasChild("starttls") && !features.encryptionEnabled) {
597 sendStartTLS();
598 } else if (this.streamFeatures.hasChild("register")
599 && account.isOptionSet(Account.OPTION_REGISTER)
600 && features.encryptionEnabled) {
601 sendRegistryRequest();
602 } else if (!this.streamFeatures.hasChild("register")
603 && account.isOptionSet(Account.OPTION_REGISTER)) {
604 changeStatus(Account.State.REGISTRATION_NOT_SUPPORTED);
605 disconnect(true);
606 } else if (this.streamFeatures.hasChild("mechanisms")
607 && shouldAuthenticate && features.encryptionEnabled) {
608 final List<String> mechanisms = extractMechanisms(streamFeatures
609 .findChild("mechanisms"));
610 final Element auth = new Element("auth");
611 auth.setAttribute("xmlns", "urn:ietf:params:xml:ns:xmpp-sasl");
612 if (mechanisms.contains("SCRAM-SHA-1")) {
613 saslMechanism = new ScramSha1(tagWriter, account, mXmppConnectionService.getRNG());
614 } else if (mechanisms.contains("PLAIN")) {
615 saslMechanism = new Plain(tagWriter, account);
616 } else if (mechanisms.contains("DIGEST-MD5")) {
617 saslMechanism = new DigestMd5(tagWriter, account, mXmppConnectionService.getRNG());
618 }
619 if (saslMechanism != null) {
620 final JSONObject keys = account.getKeys();
621 try {
622 if (keys.has(Account.PINNED_MECHANISM_KEY) &&
623 keys.getInt(Account.PINNED_MECHANISM_KEY) > saslMechanism.getPriority()) {
624 Log.e(Config.LOGTAG, "Auth failed. Authentication mechanism " + saslMechanism.getMechanism() +
625 " has lower priority (" + String.valueOf(saslMechanism.getPriority()) +
626 ") than pinned priority (" + keys.getInt(Account.PINNED_MECHANISM_KEY) +
627 "). Possible downgrade attack?");
628 throw new SecurityException();
629 }
630 } catch (final JSONException e) {
631 Log.d(Config.LOGTAG, "Parse error while checking pinned auth mechanism");
632 }
633 Log.d(Config.LOGTAG, account.getJid().toString() + ": Authenticating with " + saslMechanism.getMechanism());
634 auth.setAttribute("mechanism", saslMechanism.getMechanism());
635 if (!saslMechanism.getClientFirstMessage().isEmpty()) {
636 auth.setContent(saslMechanism.getClientFirstMessage());
637 }
638 tagWriter.writeElement(auth);
639 } else {
640 throw new IncompatibleServerException();
641 }
642 } else if (this.streamFeatures.hasChild("sm", "urn:xmpp:sm:"
643 + smVersion)
644 && streamId != null) {
645 if (Config.EXTENDED_SM_LOGGING) {
646 Log.d(Config.LOGTAG,account.getJid().toBareJid()+": resuming after stanza #"+stanzasReceived);
647 }
648 final ResumePacket resume = new ResumePacket(this.streamId, stanzasReceived, smVersion);
649 this.tagWriter.writeStanzaAsync(resume);
650 } else if (this.streamFeatures.hasChild("bind") && shouldBind) {
651 sendBindRequest();
652 } else {
653 disconnect(true);
654 changeStatus(Account.State.INCOMPATIBLE_SERVER);
655 }
656 }
657
658 private List<String> extractMechanisms(final Element stream) {
659 final ArrayList<String> mechanisms = new ArrayList<>(stream
660 .getChildren().size());
661 for (final Element child : stream.getChildren()) {
662 mechanisms.add(child.getContent());
663 }
664 return mechanisms;
665 }
666
667 private void sendRegistryRequest() {
668 final IqPacket register = new IqPacket(IqPacket.TYPE.GET);
669 register.query("jabber:iq:register");
670 register.setTo(account.getServer());
671 sendIqPacket(register, new OnIqPacketReceived() {
672
673 @Override
674 public void onIqPacketReceived(final Account account, final IqPacket packet) {
675 final Element instructions = packet.query().findChild("instructions");
676 if (packet.query().hasChild("username")
677 && (packet.query().hasChild("password"))) {
678 final IqPacket register = new IqPacket(IqPacket.TYPE.SET);
679 final Element username = new Element("username").setContent(account.getUsername());
680 final Element password = new Element("password").setContent(account.getPassword());
681 register.query("jabber:iq:register").addChild(username);
682 register.query().addChild(password);
683 sendIqPacket(register, new OnIqPacketReceived() {
684
685 @Override
686 public void onIqPacketReceived(final Account account, final IqPacket packet) {
687 if (packet.getType() == IqPacket.TYPE.RESULT) {
688 account.setOption(Account.OPTION_REGISTER,
689 false);
690 changeStatus(Account.State.REGISTRATION_SUCCESSFUL);
691 } else if (packet.hasChild("error")
692 && (packet.findChild("error")
693 .hasChild("conflict"))) {
694 changeStatus(Account.State.REGISTRATION_CONFLICT);
695 } else {
696 changeStatus(Account.State.REGISTRATION_FAILED);
697 Log.d(Config.LOGTAG, packet.toString());
698 }
699 disconnect(true);
700 }
701 });
702 } else {
703 changeStatus(Account.State.REGISTRATION_FAILED);
704 disconnect(true);
705 Log.d(Config.LOGTAG, account.getJid().toBareJid()
706 + ": could not register. instructions are"
707 + (instructions != null ? instructions.getContent() : ""));
708 }
709 }
710 });
711 }
712
713 private void sendBindRequest() {
714 while(!mXmppConnectionService.areMessagesInitialized()) {
715 try {
716 Thread.sleep(500);
717 } catch (final InterruptedException ignored) {
718 }
719 }
720 clearIqCallbacks();
721 final IqPacket iq = new IqPacket(IqPacket.TYPE.SET);
722 iq.addChild("bind", "urn:ietf:params:xml:ns:xmpp-bind")
723 .addChild("resource").setContent(account.getResource());
724 this.sendUnmodifiedIqPacket(iq, new OnIqPacketReceived() {
725 @Override
726 public void onIqPacketReceived(final Account account, final IqPacket packet) {
727 final Element bind = packet.findChild("bind");
728 if (bind != null) {
729 final Element jid = bind.findChild("jid");
730 if (jid != null && jid.getContent() != null) {
731 try {
732 account.setResource(Jid.fromString(jid.getContent()).getResourcepart());
733 } catch (final InvalidJidException e) {
734 // TODO: Handle the case where an external JID is technically invalid?
735 }
736 if (streamFeatures.hasChild("session")) {
737 sendStartSession();
738 } else {
739 sendPostBindInitialization();
740 }
741 } else {
742 disconnect(true);
743 }
744 } else {
745 disconnect(true);
746 }
747 }
748 });
749 }
750
751 private void clearIqCallbacks() {
752 Log.d(Config.LOGTAG,account.getJid().toBareJid()+": clearing iq iq callbacks");
753 final IqPacket failurePacket = new IqPacket(IqPacket.TYPE.ERROR);
754 Iterator<Entry<String, Pair<IqPacket, OnIqPacketReceived>>> iterator = this.packetCallbacks.entrySet().iterator();
755 while(iterator.hasNext()) {
756 Entry<String, Pair<IqPacket, OnIqPacketReceived>> entry = iterator.next();
757 entry.getValue().second.onIqPacketReceived(account,failurePacket);
758 iterator.remove();
759 }
760 }
761
762 private void sendStartSession() {
763 final IqPacket startSession = new IqPacket(IqPacket.TYPE.SET);
764 startSession.addChild("session", "urn:ietf:params:xml:ns:xmpp-session");
765 this.sendUnmodifiedIqPacket(startSession, new OnIqPacketReceived() {
766 @Override
767 public void onIqPacketReceived(Account account, IqPacket packet) {
768 if (packet.getType() == IqPacket.TYPE.RESULT) {
769 sendPostBindInitialization();
770 } else {
771 disconnect(true);
772 }
773 }
774 });
775 }
776
777 private void sendPostBindInitialization() {
778 smVersion = 0;
779 if (streamFeatures.hasChild("sm", "urn:xmpp:sm:3")) {
780 smVersion = 3;
781 } else if (streamFeatures.hasChild("sm", "urn:xmpp:sm:2")) {
782 smVersion = 2;
783 }
784 if (smVersion != 0) {
785 final EnablePacket enable = new EnablePacket(smVersion);
786 tagWriter.writeStanzaAsync(enable);
787 stanzasSent = 0;
788 mStanzaReceipts.clear();
789 }
790 features.carbonsEnabled = false;
791 features.blockListRequested = false;
792 disco.clear();
793 sendServiceDiscoveryInfo(account.getServer());
794 sendServiceDiscoveryInfo(account.getJid().toBareJid());
795 sendServiceDiscoveryItems(account.getServer());
796 if (bindListener != null) {
797 bindListener.onBind(account);
798 }
799 sendInitialPing();
800 }
801
802 private void sendServiceDiscoveryInfo(final Jid jid) {
803 if (disco.containsKey(jid)) {
804 if (account.getServer().equals(jid)) {
805 enableAdvancedStreamFeatures();
806 }
807 } else {
808 final IqPacket iq = new IqPacket(IqPacket.TYPE.GET);
809 iq.setTo(jid);
810 iq.query("http://jabber.org/protocol/disco#info");
811 this.sendIqPacket(iq, new OnIqPacketReceived() {
812
813 @Override
814 public void onIqPacketReceived(final Account account, final IqPacket packet) {
815 final List<Element> elements = packet.query().getChildren();
816 final Info info = new Info();
817 for (final Element element : elements) {
818 if (element.getName().equals("identity")) {
819 String type = element.getAttribute("type");
820 String category = element.getAttribute("category");
821 if (type != null && category != null) {
822 info.identities.add(new Pair<>(category,type));
823 }
824 } else if (element.getName().equals("feature")) {
825 info.features.add(element.getAttribute("var"));
826 }
827 }
828 disco.put(jid, info);
829
830 if (account.getServer().equals(jid)) {
831 enableAdvancedStreamFeatures();
832 for (final OnAdvancedStreamFeaturesLoaded listener : advancedStreamFeaturesLoadedListeners) {
833 listener.onAdvancedStreamFeaturesAvailable(account);
834 }
835 }
836 }
837 });
838 }
839 }
840
841 private void enableAdvancedStreamFeatures() {
842 if (getFeatures().carbons() && !features.carbonsEnabled) {
843 sendEnableCarbons();
844 }
845 if (getFeatures().blocking() && !features.blockListRequested) {
846 Log.d(Config.LOGTAG,account.getJid().toBareJid()+": Requesting block list");
847 this.sendIqPacket(getIqGenerator().generateGetBlockList(), mXmppConnectionService.getIqParser());
848 }
849 }
850
851 private void sendServiceDiscoveryItems(final Jid server) {
852 final IqPacket iq = new IqPacket(IqPacket.TYPE.GET);
853 iq.setTo(server.toDomainJid());
854 iq.query("http://jabber.org/protocol/disco#items");
855 this.sendIqPacket(iq, new OnIqPacketReceived() {
856
857 @Override
858 public void onIqPacketReceived(final Account account, final IqPacket packet) {
859 final List<Element> elements = packet.query().getChildren();
860 for (final Element element : elements) {
861 if (element.getName().equals("item")) {
862 final Jid jid = element.getAttributeAsJid("jid");
863 if (jid != null && !jid.equals(account.getServer())) {
864 sendServiceDiscoveryInfo(jid);
865 }
866 }
867 }
868 }
869 });
870 }
871
872 private void sendEnableCarbons() {
873 final IqPacket iq = new IqPacket(IqPacket.TYPE.SET);
874 iq.addChild("enable", "urn:xmpp:carbons:2");
875 this.sendIqPacket(iq, new OnIqPacketReceived() {
876
877 @Override
878 public void onIqPacketReceived(final Account account, final IqPacket packet) {
879 if (!packet.hasChild("error")) {
880 Log.d(Config.LOGTAG, account.getJid().toBareJid()
881 + ": successfully enabled carbons");
882 features.carbonsEnabled = true;
883 } else {
884 Log.d(Config.LOGTAG, account.getJid().toBareJid()
885 + ": error enableing carbons " + packet.toString());
886 }
887 }
888 });
889 }
890
891 private void processStreamError(final Tag currentTag)
892 throws XmlPullParserException, IOException {
893 final Element streamError = tagReader.readElement(currentTag);
894 if (streamError != null && streamError.hasChild("conflict")) {
895 final String resource = account.getResource().split("\\.")[0];
896 account.setResource(resource + "." + nextRandomId());
897 Log.d(Config.LOGTAG,
898 account.getJid().toBareJid() + ": switching resource due to conflict ("
899 + account.getResource() + ")");
900 }
901 }
902
903 private void sendStartStream() throws IOException {
904 final Tag stream = Tag.start("stream:stream");
905 stream.setAttribute("from", account.getJid().toBareJid().toString());
906 stream.setAttribute("to", account.getServer().toString());
907 stream.setAttribute("version", "1.0");
908 stream.setAttribute("xml:lang", "en");
909 stream.setAttribute("xmlns", "jabber:client");
910 stream.setAttribute("xmlns:stream", "http://etherx.jabber.org/streams");
911 tagWriter.writeTag(stream);
912 }
913
914 private String nextRandomId() {
915 return new BigInteger(50, mXmppConnectionService.getRNG()).toString(32);
916 }
917
918 public void sendIqPacket(final IqPacket packet, final OnIqPacketReceived callback) {
919 packet.setFrom(account.getJid());
920 this.sendUnmodifiedIqPacket(packet, callback);
921
922 }
923
924 private synchronized void sendUnmodifiedIqPacket(final IqPacket packet, final OnIqPacketReceived callback) {
925 if (packet.getId() == null) {
926 final String id = nextRandomId();
927 packet.setAttribute("id", id);
928 }
929 if (callback != null) {
930 packetCallbacks.put(packet.getId(), new Pair<>(packet, callback));
931 }
932 this.sendPacket(packet);
933 }
934
935 public void sendMessagePacket(final MessagePacket packet) {
936 this.sendPacket(packet);
937 }
938
939 public void sendPresencePacket(final PresencePacket packet) {
940 this.sendPacket(packet);
941 }
942
943 private synchronized void sendPacket(final AbstractStanza packet) {
944 if (stanzasSent == Integer.MAX_VALUE) {
945 resetStreamId();
946 disconnect(true);
947 return;
948 }
949 final String name = packet.getName();
950 if (name.equals("iq") || name.equals("message") || name.equals("presence")) {
951 ++stanzasSent;
952 }
953 tagWriter.writeStanzaAsync(packet);
954 if ((packet instanceof MessagePacket || packet instanceof IqPacket) && packet.getId() != null && getFeatures().sm()) {
955 if (Config.EXTENDED_SM_LOGGING) {
956 Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": requesting ack for stanza #" + stanzasSent);
957 }
958 this.mStanzaReceipts.put(stanzasSent, packet.getId());
959 tagWriter.writeStanzaAsync(new RequestPacket(this.smVersion));
960 }
961 }
962
963 public void sendPing() {
964 if (streamFeatures.hasChild("sm")) {
965 tagWriter.writeStanzaAsync(new RequestPacket(smVersion));
966 } else {
967 final IqPacket iq = new IqPacket(IqPacket.TYPE.GET);
968 iq.setFrom(account.getJid());
969 iq.addChild("ping", "urn:xmpp:ping");
970 this.sendIqPacket(iq, null);
971 }
972 this.lastPingSent = SystemClock.elapsedRealtime();
973 }
974
975 public void setOnMessagePacketReceivedListener(
976 final OnMessagePacketReceived listener) {
977 this.messageListener = listener;
978 }
979
980 public void setOnUnregisteredIqPacketReceivedListener(
981 final OnIqPacketReceived listener) {
982 this.unregisteredIqListener = listener;
983 }
984
985 public void setOnPresencePacketReceivedListener(
986 final OnPresencePacketReceived listener) {
987 this.presenceListener = listener;
988 }
989
990 public void setOnJinglePacketReceivedListener(
991 final OnJinglePacketReceived listener) {
992 this.jingleListener = listener;
993 }
994
995 public void setOnStatusChangedListener(final OnStatusChanged listener) {
996 this.statusListener = listener;
997 }
998
999 public void setOnBindListener(final OnBindListener listener) {
1000 this.bindListener = listener;
1001 }
1002
1003 public void setOnMessageAcknowledgeListener(final OnMessageAcknowledged listener) {
1004 this.acknowledgedListener = listener;
1005 }
1006
1007 public void addOnAdvancedStreamFeaturesAvailableListener(final OnAdvancedStreamFeaturesLoaded listener) {
1008 if (!this.advancedStreamFeaturesLoadedListeners.contains(listener)) {
1009 this.advancedStreamFeaturesLoadedListeners.add(listener);
1010 }
1011 }
1012
1013 public void disconnect(final boolean force) {
1014 Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": disconnecting");
1015 try {
1016 if (force) {
1017 socket.close();
1018 return;
1019 }
1020 new Thread(new Runnable() {
1021
1022 @Override
1023 public void run() {
1024 if (tagWriter.isActive()) {
1025 tagWriter.finish();
1026 try {
1027 while (!tagWriter.finished()) {
1028 Log.d(Config.LOGTAG, "not yet finished");
1029 Thread.sleep(100);
1030 }
1031 tagWriter.writeTag(Tag.end("stream:stream"));
1032 socket.close();
1033 } catch (final IOException e) {
1034 Log.d(Config.LOGTAG,
1035 "io exception during disconnect");
1036 } catch (final InterruptedException e) {
1037 Log.d(Config.LOGTAG, "interrupted");
1038 }
1039 }
1040 }
1041 }).start();
1042 } catch (final IOException e) {
1043 Log.d(Config.LOGTAG, "io exception during disconnect");
1044 }
1045 }
1046
1047 public void resetStreamId() {
1048 this.streamId = null;
1049 }
1050
1051 public List<Jid> findDiscoItemsByFeature(final String feature) {
1052 final List<Jid> items = new ArrayList<>();
1053 for (final Entry<Jid, Info> cursor : disco.entrySet()) {
1054 if (cursor.getValue().features.contains(feature)) {
1055 items.add(cursor.getKey());
1056 }
1057 }
1058 return items;
1059 }
1060
1061 public Jid findDiscoItemByFeature(final String feature) {
1062 final List<Jid> items = findDiscoItemsByFeature(feature);
1063 if (items.size() >= 1) {
1064 return items.get(0);
1065 }
1066 return null;
1067 }
1068
1069 public void r() {
1070 this.tagWriter.writeStanzaAsync(new RequestPacket(smVersion));
1071 }
1072
1073 public String getMucServer() {
1074 for (final Entry<Jid, Info> cursor : disco.entrySet()) {
1075 final Info value = cursor.getValue();
1076 if (value.features.contains("http://jabber.org/protocol/muc")
1077 && !value.features.contains("jabber:iq:gateway")
1078 && !value.identities.contains(new Pair<>("conference","irc"))) {
1079 return cursor.getKey().toString();
1080 }
1081 }
1082 return null;
1083 }
1084
1085 public int getTimeToNextAttempt() {
1086 final int interval = (int) (25 * Math.pow(1.5, attempt));
1087 final int secondsSinceLast = (int) ((SystemClock.elapsedRealtime() - this.lastConnect) / 1000);
1088 return interval - secondsSinceLast;
1089 }
1090
1091 public int getAttempt() {
1092 return this.attempt;
1093 }
1094
1095 public Features getFeatures() {
1096 return this.features;
1097 }
1098
1099 public long getLastSessionEstablished() {
1100 final long diff;
1101 if (this.lastSessionStarted == 0) {
1102 diff = SystemClock.elapsedRealtime() - this.lastConnect;
1103 } else {
1104 diff = SystemClock.elapsedRealtime() - this.lastSessionStarted;
1105 }
1106 return System.currentTimeMillis() - diff;
1107 }
1108
1109 public long getLastConnect() {
1110 return this.lastConnect;
1111 }
1112
1113 public long getLastPingSent() {
1114 return this.lastPingSent;
1115 }
1116
1117 public long getLastPacketReceived() {
1118 return this.lastPacketReceived;
1119 }
1120
1121 public void sendActive() {
1122 this.sendPacket(new ActivePacket());
1123 }
1124
1125 public void sendInactive() {
1126 this.sendPacket(new InactivePacket());
1127 }
1128
1129 public void resetAttemptCount() {
1130 this.attempt = 0;
1131 this.lastConnect = 0;
1132 }
1133
1134 private class Info {
1135 public final ArrayList<String> features = new ArrayList<>();
1136 public final ArrayList<Pair<String,String>> identities = new ArrayList<>();
1137 }
1138
1139 private class UnauthorizedException extends IOException {
1140
1141 }
1142
1143 private class SecurityException extends IOException {
1144
1145 }
1146
1147 private class IncompatibleServerException extends IOException {
1148
1149 }
1150
1151 public class Features {
1152 XmppConnection connection;
1153 private boolean carbonsEnabled = false;
1154 private boolean encryptionEnabled = false;
1155 private boolean blockListRequested = false;
1156
1157 public Features(final XmppConnection connection) {
1158 this.connection = connection;
1159 }
1160
1161 private boolean hasDiscoFeature(final Jid server, final String feature) {
1162 return connection.disco.containsKey(server) &&
1163 connection.disco.get(server).features.contains(feature);
1164 }
1165
1166 public boolean carbons() {
1167 return hasDiscoFeature(account.getServer(), "urn:xmpp:carbons:2");
1168 }
1169
1170 public boolean blocking() {
1171 return hasDiscoFeature(account.getServer(), Xmlns.BLOCKING);
1172 }
1173
1174 public boolean register() {
1175 return hasDiscoFeature(account.getServer(), Xmlns.REGISTER);
1176 }
1177
1178 public boolean sm() {
1179 return streamId != null
1180 || (connection.streamFeatures != null && connection.streamFeatures.hasChild("sm"));
1181 }
1182
1183 public boolean csi() {
1184 return connection.streamFeatures != null && connection.streamFeatures.hasChild("csi", "urn:xmpp:csi:0");
1185 }
1186
1187 public boolean pep() {
1188 final Pair<String,String> needle = new Pair<>("pubsub","pep");
1189 Info info = disco.get(account.getServer());
1190 if (info != null && info.identities.contains(needle)) {
1191 return true;
1192 } else {
1193 info = disco.get(account.getJid().toBareJid());
1194 return info != null && info.identities.contains(needle);
1195 }
1196 }
1197
1198 public boolean mam() {
1199 if (hasDiscoFeature(account.getJid().toBareJid(), "urn:xmpp:mam:0")) {
1200 return true;
1201 } else {
1202 return hasDiscoFeature(account.getServer(), "urn:xmpp:mam:0");
1203 }
1204 }
1205
1206 public boolean advancedStreamFeaturesLoaded() {
1207 return disco.containsKey(account.getServer());
1208 }
1209
1210 public boolean rosterVersioning() {
1211 return connection.streamFeatures != null && connection.streamFeatures.hasChild("ver");
1212 }
1213
1214 public void setBlockListRequested(boolean value) {
1215 this.blockListRequested = value;
1216 }
1217
1218 public boolean httpUpload() {
1219 return findDiscoItemsByFeature(Xmlns.HTTP_UPLOAD).size() > 0;
1220 }
1221 }
1222
1223 private IqGenerator getIqGenerator() {
1224 return mXmppConnectionService.getIqGenerator();
1225 }
1226}