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 ++stanzasReceived;
441 lastPacketReceived = SystemClock.elapsedRealtime();
442 return element;
443 }
444
445 private void processIq(final Tag currentTag) throws XmlPullParserException, IOException {
446 final IqPacket packet = (IqPacket) processPacket(currentTag, PACKET_IQ);
447
448 if (packet.getId() == null) {
449 return; // an iq packet without id is definitely invalid
450 }
451
452 if (packet instanceof JinglePacket) {
453 if (this.jingleListener != null) {
454 this.jingleListener.onJinglePacketReceived(account,(JinglePacket) packet);
455 }
456 } else {
457 if (packetCallbacks.containsKey(packet.getId())) {
458 final Pair<IqPacket, OnIqPacketReceived> packetCallbackDuple = packetCallbacks.get(packet.getId());
459 // Packets to the server should have responses from the server
460 if (packetCallbackDuple.first.toServer(account)) {
461 if (packet.fromServer(account)) {
462 packetCallbackDuple.second.onIqPacketReceived(account, packet);
463 packetCallbacks.remove(packet.getId());
464 } else {
465 Log.e(Config.LOGTAG,account.getJid().toBareJid().toString()+": ignoring spoofed iq packet");
466 }
467 } else {
468 if (packet.getFrom().equals(packetCallbackDuple.first.getTo())) {
469 packetCallbackDuple.second.onIqPacketReceived(account, packet);
470 packetCallbacks.remove(packet.getId());
471 } else {
472 Log.e(Config.LOGTAG,account.getJid().toBareJid().toString()+": ignoring spoofed iq packet");
473 }
474 }
475 } else if (packet.getType() == IqPacket.TYPE.GET|| packet.getType() == IqPacket.TYPE.SET) {
476 this.unregisteredIqListener.onIqPacketReceived(account, packet);
477 }
478 }
479 }
480
481 private void processMessage(final Tag currentTag) throws XmlPullParserException, IOException {
482 final MessagePacket packet = (MessagePacket) processPacket(currentTag,PACKET_MESSAGE);
483 this.messageListener.onMessagePacketReceived(account, packet);
484 }
485
486 private void processPresence(final Tag currentTag) throws XmlPullParserException, IOException {
487 PresencePacket packet = (PresencePacket) processPacket(currentTag, PACKET_PRESENCE);
488 this.presenceListener.onPresencePacketReceived(account, packet);
489 }
490
491 private void sendStartTLS() throws IOException {
492 final Tag startTLS = Tag.empty("starttls");
493 startTLS.setAttribute("xmlns", "urn:ietf:params:xml:ns:xmpp-tls");
494 tagWriter.writeTag(startTLS);
495 }
496
497 private SharedPreferences getPreferences() {
498 return PreferenceManager.getDefaultSharedPreferences(applicationContext);
499 }
500
501 private boolean enableLegacySSL() {
502 return getPreferences().getBoolean("enable_legacy_ssl", false);
503 }
504
505 private void switchOverToTls(final Tag currentTag) throws XmlPullParserException, IOException {
506 tagReader.readTag();
507 try {
508 final SSLContext sc = SSLContext.getInstance("TLS");
509 sc.init(null,new X509TrustManager[]{this.mXmppConnectionService.getMemorizingTrustManager()},mXmppConnectionService.getRNG());
510 final SSLSocketFactory factory = sc.getSocketFactory();
511 final HostnameVerifier verifier = this.mXmppConnectionService.getMemorizingTrustManager().wrapHostnameVerifier(new StrictHostnameVerifier());
512 final InetAddress address = socket == null ? null : socket.getInetAddress();
513
514 if (factory == null || address == null || verifier == null) {
515 throw new IOException("could not setup ssl");
516 }
517
518 final SSLSocket sslSocket = (SSLSocket) factory.createSocket(socket,address.getHostAddress(), socket.getPort(),true);
519
520 if (sslSocket == null) {
521 throw new IOException("could not initialize ssl socket");
522 }
523
524 final String[] supportProtocols;
525 final Collection<String> supportedProtocols = new LinkedList<>(
526 Arrays.asList(sslSocket.getSupportedProtocols()));
527 supportedProtocols.remove("SSLv3");
528 supportProtocols = supportedProtocols.toArray(new String[supportedProtocols.size()]);
529
530 sslSocket.setEnabledProtocols(supportProtocols);
531
532 final String[] cipherSuites = CryptoHelper.getOrderedCipherSuites(
533 sslSocket.getSupportedCipherSuites());
534 //Log.d(Config.LOGTAG, "Using ciphers: " + Arrays.toString(cipherSuites));
535 if (cipherSuites.length > 0) {
536 sslSocket.setEnabledCipherSuites(cipherSuites);
537 }
538
539 if (!verifier.verify(account.getServer().getDomainpart(),sslSocket.getSession())) {
540 Log.d(Config.LOGTAG,account.getJid().toBareJid()+": TLS certificate verification failed");
541 disconnect(true);
542 changeStatus(Account.State.SECURITY_ERROR);
543 }
544 tagReader.setInputStream(sslSocket.getInputStream());
545 tagWriter.setOutputStream(sslSocket.getOutputStream());
546 sendStartStream();
547 Log.d(Config.LOGTAG, account.getJid().toBareJid()+ ": TLS connection established");
548 features.encryptionEnabled = true;
549 processStream(tagReader.readTag());
550 sslSocket.close();
551 } catch (final NoSuchAlgorithmException | KeyManagementException e1) {
552 Log.d(Config.LOGTAG,account.getJid().toBareJid()+": TLS certificate verification failed");
553 disconnect(true);
554 changeStatus(Account.State.SECURITY_ERROR);
555 }
556 }
557
558 private void processStreamFeatures(final Tag currentTag)
559 throws XmlPullParserException, IOException {
560 this.streamFeatures = tagReader.readElement(currentTag);
561 if (this.streamFeatures.hasChild("starttls") && !features.encryptionEnabled) {
562 sendStartTLS();
563 } else if (this.streamFeatures.hasChild("register")
564 && account.isOptionSet(Account.OPTION_REGISTER)
565 && features.encryptionEnabled) {
566 sendRegistryRequest();
567 } else if (!this.streamFeatures.hasChild("register")
568 && account.isOptionSet(Account.OPTION_REGISTER)) {
569 changeStatus(Account.State.REGISTRATION_NOT_SUPPORTED);
570 disconnect(true);
571 } else if (this.streamFeatures.hasChild("mechanisms")
572 && shouldAuthenticate && features.encryptionEnabled) {
573 final List<String> mechanisms = extractMechanisms(streamFeatures
574 .findChild("mechanisms"));
575 final Element auth = new Element("auth");
576 auth.setAttribute("xmlns", "urn:ietf:params:xml:ns:xmpp-sasl");
577 if (mechanisms.contains("SCRAM-SHA-1")) {
578 saslMechanism = new ScramSha1(tagWriter, account, mXmppConnectionService.getRNG());
579 } else if (mechanisms.contains("PLAIN")) {
580 saslMechanism = new Plain(tagWriter, account);
581 } else if (mechanisms.contains("DIGEST-MD5")) {
582 saslMechanism = new DigestMd5(tagWriter, account, mXmppConnectionService.getRNG());
583 }
584 if (saslMechanism != null) {
585 final JSONObject keys = account.getKeys();
586 try {
587 if (keys.has(Account.PINNED_MECHANISM_KEY) &&
588 keys.getInt(Account.PINNED_MECHANISM_KEY) > saslMechanism.getPriority()) {
589 Log.e(Config.LOGTAG, "Auth failed. Authentication mechanism " + saslMechanism.getMechanism() +
590 " has lower priority (" + String.valueOf(saslMechanism.getPriority()) +
591 ") than pinned priority (" + keys.getInt(Account.PINNED_MECHANISM_KEY) +
592 "). Possible downgrade attack?");
593 disconnect(true);
594 changeStatus(Account.State.SECURITY_ERROR);
595 }
596 } catch (final JSONException e) {
597 Log.d(Config.LOGTAG, "Parse error while checking pinned auth mechanism");
598 }
599 Log.d(Config.LOGTAG, account.getJid().toString() + ": Authenticating with " + saslMechanism.getMechanism());
600 auth.setAttribute("mechanism", saslMechanism.getMechanism());
601 if (!saslMechanism.getClientFirstMessage().isEmpty()) {
602 auth.setContent(saslMechanism.getClientFirstMessage());
603 }
604 tagWriter.writeElement(auth);
605 } else {
606 disconnect(true);
607 changeStatus(Account.State.INCOMPATIBLE_SERVER);
608 }
609 } else if (this.streamFeatures.hasChild("sm", "urn:xmpp:sm:"
610 + smVersion)
611 && streamId != null) {
612 if (Config.EXTENDED_SM_LOGGING) {
613 Log.d(Config.LOGTAG,account.getJid().toBareJid()+": resuming after stanza #"+stanzasReceived);
614 }
615 final ResumePacket resume = new ResumePacket(this.streamId, stanzasReceived, smVersion);
616 this.tagWriter.writeStanzaAsync(resume);
617 } else if (this.streamFeatures.hasChild("bind") && shouldBind) {
618 sendBindRequest();
619 } else {
620 disconnect(true);
621 changeStatus(Account.State.INCOMPATIBLE_SERVER);
622 }
623 }
624
625 private List<String> extractMechanisms(final Element stream) {
626 final ArrayList<String> mechanisms = new ArrayList<>(stream
627 .getChildren().size());
628 for (final Element child : stream.getChildren()) {
629 mechanisms.add(child.getContent());
630 }
631 return mechanisms;
632 }
633
634 private void sendRegistryRequest() {
635 final IqPacket register = new IqPacket(IqPacket.TYPE.GET);
636 register.query("jabber:iq:register");
637 register.setTo(account.getServer());
638 sendIqPacket(register, new OnIqPacketReceived() {
639
640 @Override
641 public void onIqPacketReceived(final Account account, final IqPacket packet) {
642 final Element instructions = packet.query().findChild("instructions");
643 if (packet.query().hasChild("username")
644 && (packet.query().hasChild("password"))) {
645 final IqPacket register = new IqPacket(IqPacket.TYPE.SET);
646 final Element username = new Element("username")
647 .setContent(account.getUsername());
648 final Element password = new Element("password")
649 .setContent(account.getPassword());
650 register.query("jabber:iq:register").addChild(username);
651 register.query().addChild(password);
652 sendIqPacket(register, new OnIqPacketReceived() {
653
654 @Override
655 public void onIqPacketReceived(final Account account, final IqPacket packet) {
656 if (packet.getType() == IqPacket.TYPE.RESULT) {
657 account.setOption(Account.OPTION_REGISTER,
658 false);
659 changeStatus(Account.State.REGISTRATION_SUCCESSFUL);
660 } else if (packet.hasChild("error")
661 && (packet.findChild("error")
662 .hasChild("conflict"))) {
663 changeStatus(Account.State.REGISTRATION_CONFLICT);
664 } else {
665 changeStatus(Account.State.REGISTRATION_FAILED);
666 Log.d(Config.LOGTAG, packet.toString());
667 }
668 disconnect(true);
669 }
670 });
671 } else {
672 changeStatus(Account.State.REGISTRATION_FAILED);
673 disconnect(true);
674 Log.d(Config.LOGTAG, account.getJid().toBareJid()
675 + ": could not register. instructions are"
676 + instructions.getContent());
677 }
678 }
679 });
680 }
681
682 private void sendBindRequest() {
683 while(!mXmppConnectionService.areMessagesInitialized()) {
684 try {
685 Thread.sleep(500);
686 } catch (final InterruptedException ignored) {
687 }
688 }
689 final IqPacket iq = new IqPacket(IqPacket.TYPE.SET);
690 iq.addChild("bind", "urn:ietf:params:xml:ns:xmpp-bind")
691 .addChild("resource").setContent(account.getResource());
692 this.sendUnmodifiedIqPacket(iq, new OnIqPacketReceived() {
693 @Override
694 public void onIqPacketReceived(final Account account, final IqPacket packet) {
695 final Element bind = packet.findChild("bind");
696 if (bind != null) {
697 final Element jid = bind.findChild("jid");
698 if (jid != null && jid.getContent() != null) {
699 try {
700 account.setResource(Jid.fromString(jid.getContent()).getResourcepart());
701 } catch (final InvalidJidException e) {
702 // TODO: Handle the case where an external JID is technically invalid?
703 }
704 if (streamFeatures.hasChild("session")) {
705 sendStartSession();
706 } else {
707 sendPostBindInitialization();
708 }
709 } else {
710 disconnect(true);
711 }
712 } else {
713 disconnect(true);
714 }
715 }
716 });
717 }
718
719 private void sendStartSession() {
720 final IqPacket startSession = new IqPacket(IqPacket.TYPE.SET);
721 startSession.addChild("session","urn:ietf:params:xml:ns:xmpp-session");
722 this.sendUnmodifiedIqPacket(startSession, new OnIqPacketReceived() {
723 @Override
724 public void onIqPacketReceived(Account account, IqPacket packet) {
725 if (packet.getType() == IqPacket.TYPE.RESULT) {
726 sendPostBindInitialization();
727 } else {
728 disconnect(true);
729 }
730 }
731 });
732 }
733
734 private void sendPostBindInitialization() {
735 smVersion = 0;
736 if (streamFeatures.hasChild("sm", "urn:xmpp:sm:3")) {
737 smVersion = 3;
738 } else if (streamFeatures.hasChild("sm", "urn:xmpp:sm:2")) {
739 smVersion = 2;
740 }
741 if (smVersion != 0) {
742 final EnablePacket enable = new EnablePacket(smVersion);
743 tagWriter.writeStanzaAsync(enable);
744 stanzasSent = 0;
745 messageReceipts.clear();
746 }
747 features.carbonsEnabled = false;
748 features.blockListRequested = false;
749 disco.clear();
750 sendServiceDiscoveryInfo(account.getServer());
751 sendServiceDiscoveryInfo(account.getJid().toBareJid());
752 sendServiceDiscoveryItems(account.getServer());
753 if (bindListener != null) {
754 bindListener.onBind(account);
755 }
756 sendInitialPing();
757 }
758
759 private void sendServiceDiscoveryInfo(final Jid jid) {
760 if (disco.containsKey(jid)) {
761 if (account.getServer().equals(jid)) {
762 enableAdvancedStreamFeatures();
763 }
764 } else {
765 final IqPacket iq = new IqPacket(IqPacket.TYPE.GET);
766 iq.setTo(jid);
767 iq.query("http://jabber.org/protocol/disco#info");
768 this.sendIqPacket(iq, new OnIqPacketReceived() {
769
770 @Override
771 public void onIqPacketReceived(final Account account, final IqPacket packet) {
772 final List<Element> elements = packet.query().getChildren();
773 final Info info = new Info();
774 for (final Element element : elements) {
775 if (element.getName().equals("identity")) {
776 String type = element.getAttribute("type");
777 String category = element.getAttribute("category");
778 if (type != null && category != null) {
779 info.identities.add(new Pair<>(category,type));
780 }
781 } else if (element.getName().equals("feature")) {
782 info.features.add(element.getAttribute("var"));
783 }
784 }
785 disco.put(jid, info);
786
787 if (account.getServer().equals(jid)) {
788 enableAdvancedStreamFeatures();
789 for (final OnAdvancedStreamFeaturesLoaded listener : advancedStreamFeaturesLoadedListeners) {
790 listener.onAdvancedStreamFeaturesAvailable(account);
791 }
792 }
793 }
794 });
795 }
796 }
797
798 private void enableAdvancedStreamFeatures() {
799 if (getFeatures().carbons() && !features.carbonsEnabled) {
800 sendEnableCarbons();
801 }
802 if (getFeatures().blocking() && !features.blockListRequested) {
803 Log.d(Config.LOGTAG,account.getJid().toBareJid()+": Requesting block list");
804 this.sendIqPacket(getIqGenerator().generateGetBlockList(), mXmppConnectionService.getIqParser());
805 }
806 }
807
808 private void sendServiceDiscoveryItems(final Jid server) {
809 final IqPacket iq = new IqPacket(IqPacket.TYPE.GET);
810 iq.setTo(server.toDomainJid());
811 iq.query("http://jabber.org/protocol/disco#items");
812 this.sendIqPacket(iq, new OnIqPacketReceived() {
813
814 @Override
815 public void onIqPacketReceived(final Account account, final IqPacket packet) {
816 final List<Element> elements = packet.query().getChildren();
817 for (final Element element : elements) {
818 if (element.getName().equals("item")) {
819 final Jid jid = element.getAttributeAsJid("jid");
820 if (jid != null && !jid.equals(account.getServer())) {
821 sendServiceDiscoveryInfo(jid);
822 }
823 }
824 }
825 }
826 });
827 }
828
829 private void sendEnableCarbons() {
830 final IqPacket iq = new IqPacket(IqPacket.TYPE.SET);
831 iq.addChild("enable", "urn:xmpp:carbons:2");
832 this.sendIqPacket(iq, new OnIqPacketReceived() {
833
834 @Override
835 public void onIqPacketReceived(final Account account, final IqPacket packet) {
836 if (!packet.hasChild("error")) {
837 Log.d(Config.LOGTAG, account.getJid().toBareJid()
838 + ": successfully enabled carbons");
839 features.carbonsEnabled = true;
840 } else {
841 Log.d(Config.LOGTAG, account.getJid().toBareJid()
842 + ": error enableing carbons " + packet.toString());
843 }
844 }
845 });
846 }
847
848 private void processStreamError(final Tag currentTag)
849 throws XmlPullParserException, IOException {
850 final Element streamError = tagReader.readElement(currentTag);
851 if (streamError != null && streamError.hasChild("conflict")) {
852 final String resource = account.getResource().split("\\.")[0];
853 account.setResource(resource + "." + nextRandomId());
854 Log.d(Config.LOGTAG,
855 account.getJid().toBareJid() + ": switching resource due to conflict ("
856 + account.getResource() + ")");
857 }
858 }
859
860 private void sendStartStream() throws IOException {
861 final Tag stream = Tag.start("stream:stream");
862 stream.setAttribute("from", account.getJid().toBareJid().toString());
863 stream.setAttribute("to", account.getServer().toString());
864 stream.setAttribute("version", "1.0");
865 stream.setAttribute("xml:lang", "en");
866 stream.setAttribute("xmlns", "jabber:client");
867 stream.setAttribute("xmlns:stream", "http://etherx.jabber.org/streams");
868 tagWriter.writeTag(stream);
869 }
870
871 private String nextRandomId() {
872 return new BigInteger(50, mXmppConnectionService.getRNG()).toString(32);
873 }
874
875 public void sendIqPacket(final IqPacket packet, final OnIqPacketReceived callback) {
876 packet.setFrom(account.getJid());
877 this.sendUnmodifiedIqPacket(packet,callback);
878
879 }
880
881 private synchronized void sendUnmodifiedIqPacket(final IqPacket packet, final OnIqPacketReceived callback) {
882 if (packet.getId() == null) {
883 final String id = nextRandomId();
884 packet.setAttribute("id", id);
885 }
886 if (callback != null) {
887 if (packet.getId() == null) {
888 packet.setId(nextRandomId());
889 }
890 packetCallbacks.put(packet.getId(), new Pair<>(packet, callback));
891 }
892 this.sendPacket(packet);
893 }
894
895 public void sendMessagePacket(final MessagePacket packet) {
896 this.sendPacket(packet);
897 }
898
899 public void sendPresencePacket(final PresencePacket packet) {
900 this.sendPacket(packet);
901 }
902
903 private synchronized void sendPacket(final AbstractStanza packet) {
904 final String name = packet.getName();
905 if (name.equals("iq") || name.equals("message") || name.equals("presence")) {
906 ++stanzasSent;
907 }
908 tagWriter.writeStanzaAsync(packet);
909 if (packet instanceof MessagePacket && packet.getId() != null && this.streamId != null) {
910 if (Config.EXTENDED_SM_LOGGING) {
911 Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": requesting ack for message stanza #" + stanzasSent);
912 }
913 this.messageReceipts.put(stanzasSent, packet.getId());
914 tagWriter.writeStanzaAsync(new RequestPacket(this.smVersion));
915 }
916 }
917
918 public void sendPing() {
919 if (streamFeatures.hasChild("sm")) {
920 tagWriter.writeStanzaAsync(new RequestPacket(smVersion));
921 } else {
922 final IqPacket iq = new IqPacket(IqPacket.TYPE.GET);
923 iq.setFrom(account.getJid());
924 iq.addChild("ping", "urn:xmpp:ping");
925 this.sendIqPacket(iq, null);
926 }
927 this.lastPingSent = SystemClock.elapsedRealtime();
928 }
929
930 public void setOnMessagePacketReceivedListener(
931 final OnMessagePacketReceived listener) {
932 this.messageListener = listener;
933 }
934
935 public void setOnUnregisteredIqPacketReceivedListener(
936 final OnIqPacketReceived listener) {
937 this.unregisteredIqListener = listener;
938 }
939
940 public void setOnPresencePacketReceivedListener(
941 final OnPresencePacketReceived listener) {
942 this.presenceListener = listener;
943 }
944
945 public void setOnJinglePacketReceivedListener(
946 final OnJinglePacketReceived listener) {
947 this.jingleListener = listener;
948 }
949
950 public void setOnStatusChangedListener(final OnStatusChanged listener) {
951 this.statusListener = listener;
952 }
953
954 public void setOnBindListener(final OnBindListener listener) {
955 this.bindListener = listener;
956 }
957
958 public void setOnMessageAcknowledgeListener(final OnMessageAcknowledged listener) {
959 this.acknowledgedListener = listener;
960 }
961
962 public void addOnAdvancedStreamFeaturesAvailableListener(final OnAdvancedStreamFeaturesLoaded listener) {
963 if (!this.advancedStreamFeaturesLoadedListeners.contains(listener)) {
964 this.advancedStreamFeaturesLoadedListeners.add(listener);
965 }
966 }
967
968 public void disconnect(final boolean force) {
969 Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": disconnecting");
970 try {
971 if (force) {
972 socket.close();
973 return;
974 }
975 new Thread(new Runnable() {
976
977 @Override
978 public void run() {
979 if (tagWriter.isActive()) {
980 tagWriter.finish();
981 try {
982 while (!tagWriter.finished()) {
983 Log.d(Config.LOGTAG, "not yet finished");
984 Thread.sleep(100);
985 }
986 tagWriter.writeTag(Tag.end("stream:stream"));
987 socket.close();
988 } catch (final IOException e) {
989 Log.d(Config.LOGTAG,
990 "io exception during disconnect");
991 } catch (final InterruptedException e) {
992 Log.d(Config.LOGTAG, "interrupted");
993 }
994 }
995 }
996 }).start();
997 } catch (final IOException e) {
998 Log.d(Config.LOGTAG, "io exception during disconnect");
999 }
1000 }
1001
1002 public void resetStreamId() {
1003 this.streamId = null;
1004 }
1005
1006 public List<String> findDiscoItemsByFeature(final String feature) {
1007 final List<String> items = new ArrayList<>();
1008 for (final Entry<Jid, Info> cursor : disco.entrySet()) {
1009 if (cursor.getValue().features.contains(feature)) {
1010 items.add(cursor.getKey().toString());
1011 }
1012 }
1013 return items;
1014 }
1015
1016 public String findDiscoItemByFeature(final String feature) {
1017 final List<String> items = findDiscoItemsByFeature(feature);
1018 if (items.size() >= 1) {
1019 return items.get(0);
1020 }
1021 return null;
1022 }
1023
1024 public void r() {
1025 this.tagWriter.writeStanzaAsync(new RequestPacket(smVersion));
1026 }
1027
1028 public String getMucServer() {
1029 for (final Entry<Jid, Info> cursor : disco.entrySet()) {
1030 final Info value = cursor.getValue();
1031 if (value.features.contains("http://jabber.org/protocol/muc")
1032 && !value.features.contains("jabber:iq:gateway")
1033 && !value.identities.contains(new Pair<>("conference","irc"))) {
1034 return cursor.getKey().toString();
1035 }
1036 }
1037 return null;
1038 }
1039
1040 public int getTimeToNextAttempt() {
1041 final int interval = (int) (25 * Math.pow(1.5, attempt));
1042 final int secondsSinceLast = (int) ((SystemClock.elapsedRealtime() - this.lastConnect) / 1000);
1043 return interval - secondsSinceLast;
1044 }
1045
1046 public int getAttempt() {
1047 return this.attempt;
1048 }
1049
1050 public Features getFeatures() {
1051 return this.features;
1052 }
1053
1054 public long getLastSessionEstablished() {
1055 final long diff;
1056 if (this.lastSessionStarted == 0) {
1057 diff = SystemClock.elapsedRealtime() - this.lastConnect;
1058 } else {
1059 diff = SystemClock.elapsedRealtime() - this.lastSessionStarted;
1060 }
1061 return System.currentTimeMillis() - diff;
1062 }
1063
1064 public long getLastConnect() {
1065 return this.lastConnect;
1066 }
1067
1068 public long getLastPingSent() {
1069 return this.lastPingSent;
1070 }
1071
1072 public long getLastPacketReceived() {
1073 return this.lastPacketReceived;
1074 }
1075
1076 public void sendActive() {
1077 this.sendPacket(new ActivePacket());
1078 }
1079
1080 public void sendInactive() {
1081 this.sendPacket(new InactivePacket());
1082 }
1083
1084 public void resetAttemptCount() {
1085 this.attempt = 0;
1086 this.lastConnect = 0;
1087 }
1088
1089 private class Info {
1090 public final ArrayList<String> features = new ArrayList<>();
1091 public final ArrayList<Pair<String,String>> identities = new ArrayList<>();
1092 }
1093
1094 public class Features {
1095 XmppConnection connection;
1096 private boolean carbonsEnabled = false;
1097 private boolean encryptionEnabled = false;
1098 private boolean blockListRequested = false;
1099
1100 public Features(final XmppConnection connection) {
1101 this.connection = connection;
1102 }
1103
1104 private boolean hasDiscoFeature(final Jid server, final String feature) {
1105 return connection.disco.containsKey(server) &&
1106 connection.disco.get(server).features.contains(feature);
1107 }
1108
1109 public boolean carbons() {
1110 return hasDiscoFeature(account.getServer(), "urn:xmpp:carbons:2");
1111 }
1112
1113 public boolean blocking() {
1114 return hasDiscoFeature(account.getServer(), Xmlns.BLOCKING);
1115 }
1116
1117 public boolean register() {
1118 return hasDiscoFeature(account.getServer(), Xmlns.REGISTER);
1119 }
1120
1121 public boolean sm() {
1122 return streamId != null
1123 || (connection.streamFeatures != null && connection.streamFeatures.hasChild("sm"));
1124 }
1125
1126 public boolean csi() {
1127 return connection.streamFeatures != null && connection.streamFeatures.hasChild("csi", "urn:xmpp:csi:0");
1128 }
1129
1130 public boolean pep() {
1131 final Pair<String,String> needle = new Pair<>("pubsub","pep");
1132 Info info = disco.get(account.getServer());
1133 if (info != null && info.identities.contains(needle)) {
1134 return true;
1135 } else {
1136 info = disco.get(account.getJid().toBareJid());
1137 return info != null && info.identities.contains(needle);
1138 }
1139 }
1140
1141 public boolean mam() {
1142 if (hasDiscoFeature(account.getJid().toBareJid(), "urn:xmpp:mam:0")) {
1143 return true;
1144 } else {
1145 return hasDiscoFeature(account.getServer(), "urn:xmpp:mam:0");
1146 }
1147 }
1148
1149 public boolean advancedStreamFeaturesLoaded() {
1150 return disco.containsKey(account.getServer());
1151 }
1152
1153 public boolean rosterVersioning() {
1154 return connection.streamFeatures != null && connection.streamFeatures.hasChild("ver");
1155 }
1156
1157 public void setBlockListRequested(boolean value) {
1158 this.blockListRequested = value;
1159 }
1160 }
1161
1162 private IqGenerator getIqGenerator() {
1163 return mXmppConnectionService.getIqGenerator();
1164 }
1165}