1package eu.siacs.conversations.crypto.axolotl;
2
3import android.os.Bundle;
4import android.security.KeyChain;
5import android.support.annotation.NonNull;
6import android.support.annotation.Nullable;
7import android.util.Log;
8import android.util.Pair;
9
10import org.bouncycastle.jce.provider.BouncyCastleProvider;
11import org.whispersystems.libaxolotl.AxolotlAddress;
12import org.whispersystems.libaxolotl.IdentityKey;
13import org.whispersystems.libaxolotl.IdentityKeyPair;
14import org.whispersystems.libaxolotl.InvalidKeyException;
15import org.whispersystems.libaxolotl.InvalidKeyIdException;
16import org.whispersystems.libaxolotl.SessionBuilder;
17import org.whispersystems.libaxolotl.UntrustedIdentityException;
18import org.whispersystems.libaxolotl.ecc.ECPublicKey;
19import org.whispersystems.libaxolotl.state.PreKeyBundle;
20import org.whispersystems.libaxolotl.state.PreKeyRecord;
21import org.whispersystems.libaxolotl.state.SignedPreKeyRecord;
22import org.whispersystems.libaxolotl.util.KeyHelper;
23
24import java.security.PrivateKey;
25import java.security.Security;
26import java.security.Signature;
27import java.security.cert.X509Certificate;
28import java.util.Arrays;
29import java.util.HashMap;
30import java.util.HashSet;
31import java.util.List;
32import java.util.Map;
33import java.util.Random;
34import java.util.Set;
35
36import eu.siacs.conversations.Config;
37import eu.siacs.conversations.entities.Account;
38import eu.siacs.conversations.entities.Contact;
39import eu.siacs.conversations.entities.Conversation;
40import eu.siacs.conversations.entities.Message;
41import eu.siacs.conversations.parser.IqParser;
42import eu.siacs.conversations.services.XmppConnectionService;
43import eu.siacs.conversations.utils.CryptoHelper;
44import eu.siacs.conversations.utils.SerialSingleThreadExecutor;
45import eu.siacs.conversations.xml.Element;
46import eu.siacs.conversations.xmpp.OnAdvancedStreamFeaturesLoaded;
47import eu.siacs.conversations.xmpp.OnIqPacketReceived;
48import eu.siacs.conversations.xmpp.jid.InvalidJidException;
49import eu.siacs.conversations.xmpp.jid.Jid;
50import eu.siacs.conversations.xmpp.stanzas.IqPacket;
51
52public class AxolotlService implements OnAdvancedStreamFeaturesLoaded {
53
54 public static final String PEP_PREFIX = "eu.siacs.conversations.axolotl";
55 public static final String PEP_DEVICE_LIST = PEP_PREFIX + ".devicelist";
56 public static final String PEP_DEVICE_LIST_NOTIFY = PEP_DEVICE_LIST + "+notify";
57 public static final String PEP_BUNDLES = PEP_PREFIX + ".bundles";
58 public static final String PEP_VERIFICATION = PEP_PREFIX + ".verification";
59
60 public static final String LOGPREFIX = "AxolotlService";
61
62 public static final int NUM_KEYS_TO_PUBLISH = 100;
63 public static final int publishTriesThreshold = 3;
64
65 private final Account account;
66 private final XmppConnectionService mXmppConnectionService;
67 private final SQLiteAxolotlStore axolotlStore;
68 private final SessionMap sessions;
69 private final Map<Jid, Set<Integer>> deviceIds;
70 private final Map<String, XmppAxolotlMessage> messageCache;
71 private final FetchStatusMap fetchStatusMap;
72 private final SerialSingleThreadExecutor executor;
73 private int numPublishTriesOnEmptyPep = 0;
74 private boolean pepBroken = false;
75
76 @Override
77 public void onAdvancedStreamFeaturesAvailable(Account account) {
78 if (Config.supportOmemo()
79 && account.getXmppConnection() != null
80 && account.getXmppConnection().getFeatures().pep()) {
81 publishBundlesIfNeeded(true, false);
82 } else {
83 Log.d(Config.LOGTAG,account.getJid().toBareJid()+": skipping OMEMO initialization");
84 }
85 }
86
87 public boolean fetchMapHasErrors(List<Jid> jids) {
88 for(Jid jid : jids) {
89 if (deviceIds.get(jid) != null) {
90 for (Integer foreignId : this.deviceIds.get(jid)) {
91 AxolotlAddress address = new AxolotlAddress(jid.toString(), foreignId);
92 if (fetchStatusMap.getAll(address).containsValue(FetchStatus.ERROR)) {
93 return true;
94 }
95 }
96 }
97 }
98 return false;
99 }
100
101 private static class AxolotlAddressMap<T> {
102 protected Map<String, Map<Integer, T>> map;
103 protected final Object MAP_LOCK = new Object();
104
105 public AxolotlAddressMap() {
106 this.map = new HashMap<>();
107 }
108
109 public void put(AxolotlAddress address, T value) {
110 synchronized (MAP_LOCK) {
111 Map<Integer, T> devices = map.get(address.getName());
112 if (devices == null) {
113 devices = new HashMap<>();
114 map.put(address.getName(), devices);
115 }
116 devices.put(address.getDeviceId(), value);
117 }
118 }
119
120 public T get(AxolotlAddress address) {
121 synchronized (MAP_LOCK) {
122 Map<Integer, T> devices = map.get(address.getName());
123 if (devices == null) {
124 return null;
125 }
126 return devices.get(address.getDeviceId());
127 }
128 }
129
130 public Map<Integer, T> getAll(AxolotlAddress address) {
131 synchronized (MAP_LOCK) {
132 Map<Integer, T> devices = map.get(address.getName());
133 if (devices == null) {
134 return new HashMap<>();
135 }
136 return devices;
137 }
138 }
139
140 public boolean hasAny(AxolotlAddress address) {
141 synchronized (MAP_LOCK) {
142 Map<Integer, T> devices = map.get(address.getName());
143 return devices != null && !devices.isEmpty();
144 }
145 }
146
147 public void clear() {
148 map.clear();
149 }
150
151 }
152
153 private static class SessionMap extends AxolotlAddressMap<XmppAxolotlSession> {
154 private final XmppConnectionService xmppConnectionService;
155 private final Account account;
156
157 public SessionMap(XmppConnectionService service, SQLiteAxolotlStore store, Account account) {
158 super();
159 this.xmppConnectionService = service;
160 this.account = account;
161 this.fillMap(store);
162 }
163
164 private void putDevicesForJid(String bareJid, List<Integer> deviceIds, SQLiteAxolotlStore store) {
165 for (Integer deviceId : deviceIds) {
166 AxolotlAddress axolotlAddress = new AxolotlAddress(bareJid, deviceId);
167 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Building session for remote address: " + axolotlAddress.toString());
168 IdentityKey identityKey = store.loadSession(axolotlAddress).getSessionState().getRemoteIdentityKey();
169 if(Config.X509_VERIFICATION) {
170 X509Certificate certificate = store.getFingerprintCertificate(identityKey.getFingerprint().replaceAll("\\s", ""));
171 if (certificate != null) {
172 Bundle information = CryptoHelper.extractCertificateInformation(certificate);
173 try {
174 final String cn = information.getString("subject_cn");
175 final Jid jid = Jid.fromString(bareJid);
176 Log.d(Config.LOGTAG,"setting common name for "+jid+" to "+cn);
177 account.getRoster().getContact(jid).setCommonName(cn);
178 } catch (final InvalidJidException ignored) {
179 //ignored
180 }
181 }
182 }
183 this.put(axolotlAddress, new XmppAxolotlSession(account, store, axolotlAddress, identityKey));
184 }
185 }
186
187 private void fillMap(SQLiteAxolotlStore store) {
188 List<Integer> deviceIds = store.getSubDeviceSessions(account.getJid().toBareJid().toPreppedString());
189 putDevicesForJid(account.getJid().toBareJid().toPreppedString(), deviceIds, store);
190 for (Contact contact : account.getRoster().getContacts()) {
191 Jid bareJid = contact.getJid().toBareJid();
192 String address = bareJid.toString();
193 deviceIds = store.getSubDeviceSessions(address);
194 putDevicesForJid(address, deviceIds, store);
195 }
196
197 }
198
199 @Override
200 public void put(AxolotlAddress address, XmppAxolotlSession value) {
201 super.put(address, value);
202 value.setNotFresh();
203 xmppConnectionService.syncRosterToDisk(account);
204 }
205
206 public void put(XmppAxolotlSession session) {
207 this.put(session.getRemoteAddress(), session);
208 }
209 }
210
211 public enum FetchStatus {
212 PENDING,
213 SUCCESS,
214 SUCCESS_VERIFIED,
215 TIMEOUT,
216 ERROR
217 }
218
219 private static class FetchStatusMap extends AxolotlAddressMap<FetchStatus> {
220
221 public void clearErrorFor(Jid jid) {
222 synchronized (MAP_LOCK) {
223 Map<Integer, FetchStatus> devices = this.map.get(jid.toBareJid().toPreppedString());
224 if (devices == null) {
225 return;
226 }
227 for(Map.Entry<Integer, FetchStatus> entry : devices.entrySet()) {
228 if (entry.getValue() == FetchStatus.ERROR) {
229 Log.d(Config.LOGTAG,"resetting error for "+jid.toBareJid()+"("+entry.getKey()+")");
230 entry.setValue(FetchStatus.TIMEOUT);
231 }
232 }
233 }
234 }
235 }
236
237 public static String getLogprefix(Account account) {
238 return LOGPREFIX + " (" + account.getJid().toBareJid().toString() + "): ";
239 }
240
241 public AxolotlService(Account account, XmppConnectionService connectionService) {
242 if (Security.getProvider("BC") == null) {
243 Security.addProvider(new BouncyCastleProvider());
244 }
245 this.mXmppConnectionService = connectionService;
246 this.account = account;
247 this.axolotlStore = new SQLiteAxolotlStore(this.account, this.mXmppConnectionService);
248 this.deviceIds = new HashMap<>();
249 this.messageCache = new HashMap<>();
250 this.sessions = new SessionMap(mXmppConnectionService, axolotlStore, account);
251 this.fetchStatusMap = new FetchStatusMap();
252 this.executor = new SerialSingleThreadExecutor();
253 }
254
255 public String getOwnFingerprint() {
256 return axolotlStore.getIdentityKeyPair().getPublicKey().getFingerprint().replaceAll("\\s", "");
257 }
258
259 public Set<IdentityKey> getKeysWithTrust(FingerprintStatus status) {
260 return axolotlStore.getContactKeysWithTrust(account.getJid().toBareJid().toPreppedString(), status);
261 }
262
263 public Set<IdentityKey> getKeysWithTrust(FingerprintStatus status, Jid jid) {
264 return axolotlStore.getContactKeysWithTrust(jid.toBareJid().toPreppedString(), status);
265 }
266
267 public Set<IdentityKey> getKeysWithTrust(FingerprintStatus status, List<Jid> jids) {
268 Set<IdentityKey> keys = new HashSet<>();
269 for(Jid jid : jids) {
270 keys.addAll(axolotlStore.getContactKeysWithTrust(jid.toPreppedString(), status));
271 }
272 return keys;
273 }
274
275 public long getNumTrustedKeys(Jid jid) {
276 return axolotlStore.getContactNumTrustedKeys(jid.toBareJid().toPreppedString());
277 }
278
279 public boolean anyTargetHasNoTrustedKeys(List<Jid> jids) {
280 for(Jid jid : jids) {
281 if (axolotlStore.getContactNumTrustedKeys(jid.toBareJid().toPreppedString()) == 0) {
282 return true;
283 }
284 }
285 return false;
286 }
287
288 private AxolotlAddress getAddressForJid(Jid jid) {
289 return new AxolotlAddress(jid.toPreppedString(), 0);
290 }
291
292 private Set<XmppAxolotlSession> findOwnSessions() {
293 AxolotlAddress ownAddress = getAddressForJid(account.getJid().toBareJid());
294 return new HashSet<>(this.sessions.getAll(ownAddress).values());
295 }
296
297 private Set<XmppAxolotlSession> findSessionsForContact(Contact contact) {
298 AxolotlAddress contactAddress = getAddressForJid(contact.getJid());
299 return new HashSet<>(this.sessions.getAll(contactAddress).values());
300 }
301
302 private Set<XmppAxolotlSession> findSessionsForConversation(Conversation conversation) {
303 HashSet<XmppAxolotlSession> sessions = new HashSet<>();
304 for(Jid jid : conversation.getAcceptedCryptoTargets()) {
305 sessions.addAll(this.sessions.getAll(getAddressForJid(jid)).values());
306 }
307 return sessions;
308 }
309
310 public Set<String> getFingerprintsForOwnSessions() {
311 Set<String> fingerprints = new HashSet<>();
312 for (XmppAxolotlSession session : findOwnSessions()) {
313 fingerprints.add(session.getFingerprint());
314 }
315 return fingerprints;
316 }
317
318 public Set<String> getFingerprintsForContact(final Contact contact) {
319 Set<String> fingerprints = new HashSet<>();
320 for (XmppAxolotlSession session : findSessionsForContact(contact)) {
321 fingerprints.add(session.getFingerprint());
322 }
323 return fingerprints;
324 }
325
326 private boolean hasAny(Jid jid) {
327 return sessions.hasAny(getAddressForJid(jid));
328 }
329
330 public boolean isPepBroken() {
331 return this.pepBroken;
332 }
333
334 public void resetBrokenness() {
335 this.pepBroken = false;
336 numPublishTriesOnEmptyPep = 0;
337 }
338
339 public void clearErrorsInFetchStatusMap(Jid jid) {
340 fetchStatusMap.clearErrorFor(jid);
341 }
342
343 public void regenerateKeys(boolean wipeOther) {
344 axolotlStore.regenerate();
345 sessions.clear();
346 fetchStatusMap.clear();
347 publishBundlesIfNeeded(true, wipeOther);
348 }
349
350 public int getOwnDeviceId() {
351 return axolotlStore.getLocalRegistrationId();
352 }
353
354 public Set<Integer> getOwnDeviceIds() {
355 return this.deviceIds.get(account.getJid().toBareJid());
356 }
357
358 public void registerDevices(final Jid jid, @NonNull final Set<Integer> deviceIds) {
359 if (jid.toBareJid().equals(account.getJid().toBareJid())) {
360 if (!deviceIds.isEmpty()) {
361 Log.d(Config.LOGTAG, getLogprefix(account) + "Received non-empty own device list. Resetting publish attempts and pepBroken status.");
362 pepBroken = false;
363 numPublishTriesOnEmptyPep = 0;
364 }
365 if (deviceIds.contains(getOwnDeviceId())) {
366 deviceIds.remove(getOwnDeviceId());
367 } else {
368 publishOwnDeviceId(deviceIds);
369 }
370 for (Integer deviceId : deviceIds) {
371 AxolotlAddress ownDeviceAddress = new AxolotlAddress(jid.toBareJid().toPreppedString(), deviceId);
372 if (sessions.get(ownDeviceAddress) == null) {
373 buildSessionFromPEP(ownDeviceAddress);
374 }
375 }
376 }
377 Set<Integer> expiredDevices = new HashSet<>(axolotlStore.getSubDeviceSessions(jid.toBareJid().toPreppedString()));
378 expiredDevices.removeAll(deviceIds);
379 for (Integer deviceId : expiredDevices) {
380 AxolotlAddress address = new AxolotlAddress(jid.toBareJid().toPreppedString(), deviceId);
381 XmppAxolotlSession session = sessions.get(address);
382 if (session != null && session.getFingerprint() != null) {
383 if (session.getTrust().isActive()) {
384 session.setTrust(session.getTrust().toInactive());
385 }
386 }
387 }
388 Set<Integer> newDevices = new HashSet<>(deviceIds);
389 for (Integer deviceId : newDevices) {
390 AxolotlAddress address = new AxolotlAddress(jid.toBareJid().toPreppedString(), deviceId);
391 XmppAxolotlSession session = sessions.get(address);
392 if (session != null && session.getFingerprint() != null) {
393 if (!session.getTrust().isActive()) {
394 session.setTrust(session.getTrust().toActive());
395 }
396 }
397 }
398 this.deviceIds.put(jid, deviceIds);
399 mXmppConnectionService.keyStatusUpdated(null);
400 }
401
402 public void wipeOtherPepDevices() {
403 if (pepBroken) {
404 Log.d(Config.LOGTAG, getLogprefix(account) + "wipeOtherPepDevices called, but PEP is broken. Ignoring... ");
405 return;
406 }
407 Set<Integer> deviceIds = new HashSet<>();
408 deviceIds.add(getOwnDeviceId());
409 IqPacket publish = mXmppConnectionService.getIqGenerator().publishDeviceIds(deviceIds);
410 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Wiping all other devices from Pep:" + publish);
411 mXmppConnectionService.sendIqPacket(account, publish, new OnIqPacketReceived() {
412 @Override
413 public void onIqPacketReceived(Account account, IqPacket packet) {
414 // TODO: implement this!
415 }
416 });
417 }
418
419 public void purgeKey(final String fingerprint) {
420 axolotlStore.setFingerprintTrust(fingerprint.replaceAll("\\s", ""), FingerprintStatus.createCompromised());
421 }
422
423 public void publishOwnDeviceIdIfNeeded() {
424 if (pepBroken) {
425 Log.d(Config.LOGTAG, getLogprefix(account) + "publishOwnDeviceIdIfNeeded called, but PEP is broken. Ignoring... ");
426 return;
427 }
428 IqPacket packet = mXmppConnectionService.getIqGenerator().retrieveDeviceIds(account.getJid().toBareJid());
429 mXmppConnectionService.sendIqPacket(account, packet, new OnIqPacketReceived() {
430 @Override
431 public void onIqPacketReceived(Account account, IqPacket packet) {
432 if (packet.getType() == IqPacket.TYPE.TIMEOUT) {
433 Log.d(Config.LOGTAG, getLogprefix(account) + "Timeout received while retrieving own Device Ids.");
434 } else {
435 Element item = mXmppConnectionService.getIqParser().getItem(packet);
436 Set<Integer> deviceIds = mXmppConnectionService.getIqParser().deviceIds(item);
437 if (!deviceIds.contains(getOwnDeviceId())) {
438 publishOwnDeviceId(deviceIds);
439 }
440 }
441 }
442 });
443 }
444
445 public void publishOwnDeviceId(Set<Integer> deviceIds) {
446 Set<Integer> deviceIdsCopy = new HashSet<>(deviceIds);
447 if (!deviceIdsCopy.contains(getOwnDeviceId())) {
448 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Own device " + getOwnDeviceId() + " not in PEP devicelist.");
449 if (deviceIdsCopy.isEmpty()) {
450 if (numPublishTriesOnEmptyPep >= publishTriesThreshold) {
451 Log.w(Config.LOGTAG, getLogprefix(account) + "Own device publish attempt threshold exceeded, aborting...");
452 pepBroken = true;
453 return;
454 } else {
455 numPublishTriesOnEmptyPep++;
456 Log.w(Config.LOGTAG, getLogprefix(account) + "Own device list empty, attempting to publish (try " + numPublishTriesOnEmptyPep + ")");
457 }
458 } else {
459 numPublishTriesOnEmptyPep = 0;
460 }
461 deviceIdsCopy.add(getOwnDeviceId());
462 IqPacket publish = mXmppConnectionService.getIqGenerator().publishDeviceIds(deviceIdsCopy);
463 mXmppConnectionService.sendIqPacket(account, publish, new OnIqPacketReceived() {
464 @Override
465 public void onIqPacketReceived(Account account, IqPacket packet) {
466 if (packet.getType() == IqPacket.TYPE.ERROR) {
467 pepBroken = true;
468 Log.d(Config.LOGTAG, getLogprefix(account) + "Error received while publishing own device id" + packet.findChild("error"));
469 }
470 }
471 });
472 }
473 }
474
475 public void publishDeviceVerificationAndBundle(final SignedPreKeyRecord signedPreKeyRecord,
476 final Set<PreKeyRecord> preKeyRecords,
477 final boolean announceAfter,
478 final boolean wipe) {
479 try {
480 IdentityKey axolotlPublicKey = axolotlStore.getIdentityKeyPair().getPublicKey();
481 PrivateKey x509PrivateKey = KeyChain.getPrivateKey(mXmppConnectionService, account.getPrivateKeyAlias());
482 X509Certificate[] chain = KeyChain.getCertificateChain(mXmppConnectionService, account.getPrivateKeyAlias());
483 Signature verifier = Signature.getInstance("sha256WithRSA");
484 verifier.initSign(x509PrivateKey,mXmppConnectionService.getRNG());
485 verifier.update(axolotlPublicKey.serialize());
486 byte[] signature = verifier.sign();
487 IqPacket packet = mXmppConnectionService.getIqGenerator().publishVerification(signature, chain, getOwnDeviceId());
488 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + ": publish verification for device "+getOwnDeviceId());
489 mXmppConnectionService.sendIqPacket(account, packet, new OnIqPacketReceived() {
490 @Override
491 public void onIqPacketReceived(Account account, IqPacket packet) {
492 publishDeviceBundle(signedPreKeyRecord, preKeyRecords, announceAfter, wipe);
493 }
494 });
495 } catch (Exception e) {
496 e.printStackTrace();
497 }
498 }
499
500 public void publishBundlesIfNeeded(final boolean announce, final boolean wipe) {
501 if (pepBroken) {
502 Log.d(Config.LOGTAG, getLogprefix(account) + "publishBundlesIfNeeded called, but PEP is broken. Ignoring... ");
503 return;
504 }
505 IqPacket packet = mXmppConnectionService.getIqGenerator().retrieveBundlesForDevice(account.getJid().toBareJid(), getOwnDeviceId());
506 mXmppConnectionService.sendIqPacket(account, packet, new OnIqPacketReceived() {
507 @Override
508 public void onIqPacketReceived(Account account, IqPacket packet) {
509
510 if (packet.getType() == IqPacket.TYPE.TIMEOUT) {
511 return; //ignore timeout. do nothing
512 }
513
514 if (packet.getType() == IqPacket.TYPE.ERROR) {
515 Element error = packet.findChild("error");
516 if (error == null || !error.hasChild("item-not-found")) {
517 pepBroken = true;
518 Log.w(Config.LOGTAG, AxolotlService.getLogprefix(account) + "request for device bundles came back with something other than item-not-found" + packet);
519 return;
520 }
521 }
522
523 PreKeyBundle bundle = mXmppConnectionService.getIqParser().bundle(packet);
524 Map<Integer, ECPublicKey> keys = mXmppConnectionService.getIqParser().preKeyPublics(packet);
525 boolean flush = false;
526 if (bundle == null) {
527 Log.w(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Received invalid bundle:" + packet);
528 bundle = new PreKeyBundle(-1, -1, -1, null, -1, null, null, null);
529 flush = true;
530 }
531 if (keys == null) {
532 Log.w(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Received invalid prekeys:" + packet);
533 }
534 try {
535 boolean changed = false;
536 // Validate IdentityKey
537 IdentityKeyPair identityKeyPair = axolotlStore.getIdentityKeyPair();
538 if (flush || !identityKeyPair.getPublicKey().equals(bundle.getIdentityKey())) {
539 Log.i(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Adding own IdentityKey " + identityKeyPair.getPublicKey() + " to PEP.");
540 changed = true;
541 }
542
543 // Validate signedPreKeyRecord + ID
544 SignedPreKeyRecord signedPreKeyRecord;
545 int numSignedPreKeys = axolotlStore.loadSignedPreKeys().size();
546 try {
547 signedPreKeyRecord = axolotlStore.loadSignedPreKey(bundle.getSignedPreKeyId());
548 if (flush
549 || !bundle.getSignedPreKey().equals(signedPreKeyRecord.getKeyPair().getPublicKey())
550 || !Arrays.equals(bundle.getSignedPreKeySignature(), signedPreKeyRecord.getSignature())) {
551 Log.i(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Adding new signedPreKey with ID " + (numSignedPreKeys + 1) + " to PEP.");
552 signedPreKeyRecord = KeyHelper.generateSignedPreKey(identityKeyPair, numSignedPreKeys + 1);
553 axolotlStore.storeSignedPreKey(signedPreKeyRecord.getId(), signedPreKeyRecord);
554 changed = true;
555 }
556 } catch (InvalidKeyIdException e) {
557 Log.i(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Adding new signedPreKey with ID " + (numSignedPreKeys + 1) + " to PEP.");
558 signedPreKeyRecord = KeyHelper.generateSignedPreKey(identityKeyPair, numSignedPreKeys + 1);
559 axolotlStore.storeSignedPreKey(signedPreKeyRecord.getId(), signedPreKeyRecord);
560 changed = true;
561 }
562
563 // Validate PreKeys
564 Set<PreKeyRecord> preKeyRecords = new HashSet<>();
565 if (keys != null) {
566 for (Integer id : keys.keySet()) {
567 try {
568 PreKeyRecord preKeyRecord = axolotlStore.loadPreKey(id);
569 if (preKeyRecord.getKeyPair().getPublicKey().equals(keys.get(id))) {
570 preKeyRecords.add(preKeyRecord);
571 }
572 } catch (InvalidKeyIdException ignored) {
573 }
574 }
575 }
576 int newKeys = NUM_KEYS_TO_PUBLISH - preKeyRecords.size();
577 if (newKeys > 0) {
578 List<PreKeyRecord> newRecords = KeyHelper.generatePreKeys(
579 axolotlStore.getCurrentPreKeyId() + 1, newKeys);
580 preKeyRecords.addAll(newRecords);
581 for (PreKeyRecord record : newRecords) {
582 axolotlStore.storePreKey(record.getId(), record);
583 }
584 changed = true;
585 Log.i(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Adding " + newKeys + " new preKeys to PEP.");
586 }
587
588
589 if (changed) {
590 if (account.getPrivateKeyAlias() != null && Config.X509_VERIFICATION) {
591 mXmppConnectionService.publishDisplayName(account);
592 publishDeviceVerificationAndBundle(signedPreKeyRecord, preKeyRecords, announce, wipe);
593 } else {
594 publishDeviceBundle(signedPreKeyRecord, preKeyRecords, announce, wipe);
595 }
596 } else {
597 Log.d(Config.LOGTAG, getLogprefix(account) + "Bundle " + getOwnDeviceId() + " in PEP was current");
598 if (wipe) {
599 wipeOtherPepDevices();
600 } else if (announce) {
601 Log.d(Config.LOGTAG, getLogprefix(account) + "Announcing device " + getOwnDeviceId());
602 publishOwnDeviceIdIfNeeded();
603 }
604 }
605 } catch (InvalidKeyException e) {
606 Log.e(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Failed to publish bundle " + getOwnDeviceId() + ", reason: " + e.getMessage());
607 }
608 }
609 });
610 }
611
612 private void publishDeviceBundle(SignedPreKeyRecord signedPreKeyRecord,
613 Set<PreKeyRecord> preKeyRecords,
614 final boolean announceAfter,
615 final boolean wipe) {
616 IqPacket publish = mXmppConnectionService.getIqGenerator().publishBundles(
617 signedPreKeyRecord, axolotlStore.getIdentityKeyPair().getPublicKey(),
618 preKeyRecords, getOwnDeviceId());
619 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + ": Bundle " + getOwnDeviceId() + " in PEP not current. Publishing: " + publish);
620 mXmppConnectionService.sendIqPacket(account, publish, new OnIqPacketReceived() {
621 @Override
622 public void onIqPacketReceived(Account account, IqPacket packet) {
623 if (packet.getType() == IqPacket.TYPE.RESULT) {
624 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Successfully published bundle. ");
625 if (wipe) {
626 wipeOtherPepDevices();
627 } else if (announceAfter) {
628 Log.d(Config.LOGTAG, getLogprefix(account) + "Announcing device " + getOwnDeviceId());
629 publishOwnDeviceIdIfNeeded();
630 }
631 } else if (packet.getType() == IqPacket.TYPE.ERROR) {
632 pepBroken = true;
633 Log.d(Config.LOGTAG, getLogprefix(account) + "Error received while publishing bundle: " + packet.findChild("error"));
634 }
635 }
636 });
637 }
638
639 public enum AxolotlCapability {
640 FULL,
641 MISSING_PRESENCE,
642 MISSING_KEYS,
643 WRONG_CONFIGURATION,
644 NO_MEMBERS
645 }
646
647 public boolean isConversationAxolotlCapable(Conversation conversation) {
648 return isConversationAxolotlCapableDetailed(conversation).first == AxolotlCapability.FULL;
649 }
650
651 public Pair<AxolotlCapability,Jid> isConversationAxolotlCapableDetailed(Conversation conversation) {
652 if (conversation.getMode() == Conversation.MODE_SINGLE
653 || (conversation.getMucOptions().membersOnly() && conversation.getMucOptions().nonanonymous())) {
654 final List<Jid> jids = getCryptoTargets(conversation);
655 for(Jid jid : jids) {
656 if (!hasAny(jid) && (!deviceIds.containsKey(jid) || deviceIds.get(jid).isEmpty())) {
657 if (conversation.getAccount().getRoster().getContact(jid).mutualPresenceSubscription()) {
658 return new Pair<>(AxolotlCapability.MISSING_KEYS,jid);
659 } else {
660 return new Pair<>(AxolotlCapability.MISSING_PRESENCE,jid);
661 }
662 }
663 }
664 if (jids.size() > 0) {
665 return new Pair<>(AxolotlCapability.FULL, null);
666 } else {
667 return new Pair<>(AxolotlCapability.NO_MEMBERS, null);
668 }
669 } else {
670 return new Pair<>(AxolotlCapability.WRONG_CONFIGURATION, null);
671 }
672 }
673
674 public List<Jid> getCryptoTargets(Conversation conversation) {
675 final List<Jid> jids;
676 if (conversation.getMode() == Conversation.MODE_SINGLE) {
677 jids = Arrays.asList(conversation.getJid().toBareJid());
678 } else {
679 jids = conversation.getMucOptions().getMembers();
680 }
681 return jids;
682 }
683
684 public FingerprintStatus getFingerprintTrust(String fingerprint) {
685 return axolotlStore.getFingerprintStatus(fingerprint);
686 }
687
688 public X509Certificate getFingerprintCertificate(String fingerprint) {
689 return axolotlStore.getFingerprintCertificate(fingerprint);
690 }
691
692 public void setFingerprintTrust(String fingerprint, FingerprintStatus status) {
693 axolotlStore.setFingerprintTrust(fingerprint, status);
694 }
695
696 private void verifySessionWithPEP(final XmppAxolotlSession session) {
697 Log.d(Config.LOGTAG, "trying to verify fresh session (" + session.getRemoteAddress().getName() + ") with pep");
698 final AxolotlAddress address = session.getRemoteAddress();
699 final IdentityKey identityKey = session.getIdentityKey();
700 try {
701 IqPacket packet = mXmppConnectionService.getIqGenerator().retrieveVerificationForDevice(Jid.fromString(address.getName()), address.getDeviceId());
702 mXmppConnectionService.sendIqPacket(account, packet, new OnIqPacketReceived() {
703 @Override
704 public void onIqPacketReceived(Account account, IqPacket packet) {
705 Pair<X509Certificate[],byte[]> verification = mXmppConnectionService.getIqParser().verification(packet);
706 if (verification != null) {
707 try {
708 Signature verifier = Signature.getInstance("sha256WithRSA");
709 verifier.initVerify(verification.first[0]);
710 verifier.update(identityKey.serialize());
711 if (verifier.verify(verification.second)) {
712 try {
713 mXmppConnectionService.getMemorizingTrustManager().getNonInteractive().checkClientTrusted(verification.first, "RSA");
714 String fingerprint = session.getFingerprint();
715 Log.d(Config.LOGTAG, "verified session with x.509 signature. fingerprint was: "+fingerprint);
716 setFingerprintTrust(fingerprint, FingerprintStatus.createActiveVerified(true));
717 axolotlStore.setFingerprintCertificate(fingerprint, verification.first[0]);
718 fetchStatusMap.put(address, FetchStatus.SUCCESS_VERIFIED);
719 Bundle information = CryptoHelper.extractCertificateInformation(verification.first[0]);
720 try {
721 final String cn = information.getString("subject_cn");
722 final Jid jid = Jid.fromString(address.getName());
723 Log.d(Config.LOGTAG,"setting common name for "+jid+" to "+cn);
724 account.getRoster().getContact(jid).setCommonName(cn);
725 } catch (final InvalidJidException ignored) {
726 //ignored
727 }
728 finishBuildingSessionsFromPEP(address);
729 return;
730 } catch (Exception e) {
731 Log.d(Config.LOGTAG,"could not verify certificate");
732 }
733 }
734 } catch (Exception e) {
735 Log.d(Config.LOGTAG, "error during verification " + e.getMessage());
736 }
737 } else {
738 Log.d(Config.LOGTAG,"no verification found");
739 }
740 fetchStatusMap.put(address, FetchStatus.SUCCESS);
741 finishBuildingSessionsFromPEP(address);
742 }
743 });
744 } catch (InvalidJidException e) {
745 fetchStatusMap.put(address, FetchStatus.SUCCESS);
746 finishBuildingSessionsFromPEP(address);
747 }
748 }
749
750 private void finishBuildingSessionsFromPEP(final AxolotlAddress address) {
751 AxolotlAddress ownAddress = new AxolotlAddress(account.getJid().toBareJid().toPreppedString(), 0);
752 if (!fetchStatusMap.getAll(ownAddress).containsValue(FetchStatus.PENDING)
753 && !fetchStatusMap.getAll(address).containsValue(FetchStatus.PENDING)) {
754 FetchStatus report = null;
755 if (fetchStatusMap.getAll(ownAddress).containsValue(FetchStatus.SUCCESS_VERIFIED)
756 | fetchStatusMap.getAll(address).containsValue(FetchStatus.SUCCESS_VERIFIED)) {
757 report = FetchStatus.SUCCESS_VERIFIED;
758 } else if (fetchStatusMap.getAll(ownAddress).containsValue(FetchStatus.ERROR)
759 || fetchStatusMap.getAll(address).containsValue(FetchStatus.ERROR)) {
760 report = FetchStatus.ERROR;
761 }
762 mXmppConnectionService.keyStatusUpdated(report);
763 }
764 }
765
766 private void buildSessionFromPEP(final AxolotlAddress address) {
767 Log.i(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Building new sesstion for " + address.toString());
768 if (address.getDeviceId() == getOwnDeviceId()) {
769 throw new AssertionError("We should NEVER build a session with ourselves. What happened here?!");
770 }
771
772 try {
773 IqPacket bundlesPacket = mXmppConnectionService.getIqGenerator().retrieveBundlesForDevice(
774 Jid.fromString(address.getName()), address.getDeviceId());
775 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Retrieving bundle: " + bundlesPacket);
776 mXmppConnectionService.sendIqPacket(account, bundlesPacket, new OnIqPacketReceived() {
777
778 @Override
779 public void onIqPacketReceived(Account account, IqPacket packet) {
780 if (packet.getType() == IqPacket.TYPE.TIMEOUT) {
781 fetchStatusMap.put(address, FetchStatus.TIMEOUT);
782 } else if (packet.getType() == IqPacket.TYPE.RESULT) {
783 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Received preKey IQ packet, processing...");
784 final IqParser parser = mXmppConnectionService.getIqParser();
785 final List<PreKeyBundle> preKeyBundleList = parser.preKeys(packet);
786 final PreKeyBundle bundle = parser.bundle(packet);
787 if (preKeyBundleList.isEmpty() || bundle == null) {
788 Log.e(Config.LOGTAG, AxolotlService.getLogprefix(account) + "preKey IQ packet invalid: " + packet);
789 fetchStatusMap.put(address, FetchStatus.ERROR);
790 finishBuildingSessionsFromPEP(address);
791 return;
792 }
793 Random random = new Random();
794 final PreKeyBundle preKey = preKeyBundleList.get(random.nextInt(preKeyBundleList.size()));
795 if (preKey == null) {
796 //should never happen
797 fetchStatusMap.put(address, FetchStatus.ERROR);
798 finishBuildingSessionsFromPEP(address);
799 return;
800 }
801
802 final PreKeyBundle preKeyBundle = new PreKeyBundle(0, address.getDeviceId(),
803 preKey.getPreKeyId(), preKey.getPreKey(),
804 bundle.getSignedPreKeyId(), bundle.getSignedPreKey(),
805 bundle.getSignedPreKeySignature(), bundle.getIdentityKey());
806
807 try {
808 SessionBuilder builder = new SessionBuilder(axolotlStore, address);
809 builder.process(preKeyBundle);
810 XmppAxolotlSession session = new XmppAxolotlSession(account, axolotlStore, address, bundle.getIdentityKey());
811 sessions.put(address, session);
812 if (Config.X509_VERIFICATION) {
813 verifySessionWithPEP(session);
814 } else {
815 fetchStatusMap.put(address, FetchStatus.SUCCESS);
816 finishBuildingSessionsFromPEP(address);
817 }
818 } catch (UntrustedIdentityException | InvalidKeyException e) {
819 Log.e(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Error building session for " + address + ": "
820 + e.getClass().getName() + ", " + e.getMessage());
821 fetchStatusMap.put(address, FetchStatus.ERROR);
822 finishBuildingSessionsFromPEP(address);
823 }
824 } else {
825 fetchStatusMap.put(address, FetchStatus.ERROR);
826 Log.d(Config.LOGTAG, getLogprefix(account) + "Error received while building session:" + packet.findChild("error"));
827 finishBuildingSessionsFromPEP(address);
828 }
829 }
830 });
831 } catch (InvalidJidException e) {
832 Log.e(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Got address with invalid jid: " + address.getName());
833 }
834 }
835
836 public Set<AxolotlAddress> findDevicesWithoutSession(final Conversation conversation) {
837 Set<AxolotlAddress> addresses = new HashSet<>();
838 for(Jid jid : getCryptoTargets(conversation)) {
839 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Finding devices without session for " + jid);
840 if (deviceIds.get(jid) != null) {
841 for (Integer foreignId : this.deviceIds.get(jid)) {
842 AxolotlAddress address = new AxolotlAddress(jid.toString(), foreignId);
843 if (sessions.get(address) == null) {
844 IdentityKey identityKey = axolotlStore.loadSession(address).getSessionState().getRemoteIdentityKey();
845 if (identityKey != null) {
846 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Already have session for " + address.toString() + ", adding to cache...");
847 XmppAxolotlSession session = new XmppAxolotlSession(account, axolotlStore, address, identityKey);
848 sessions.put(address, session);
849 } else {
850 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Found device " + jid + ":" + foreignId);
851 if (fetchStatusMap.get(address) != FetchStatus.ERROR) {
852 addresses.add(address);
853 } else {
854 Log.d(Config.LOGTAG, getLogprefix(account) + "skipping over " + address + " because it's broken");
855 }
856 }
857 }
858 }
859 } else {
860 Log.w(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Have no target devices in PEP!");
861 }
862 }
863 if (deviceIds.get(account.getJid().toBareJid()) != null) {
864 for (Integer ownId : this.deviceIds.get(account.getJid().toBareJid())) {
865 AxolotlAddress address = new AxolotlAddress(account.getJid().toBareJid().toPreppedString(), ownId);
866 if (sessions.get(address) == null) {
867 IdentityKey identityKey = axolotlStore.loadSession(address).getSessionState().getRemoteIdentityKey();
868 if (identityKey != null) {
869 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Already have session for " + address.toString() + ", adding to cache...");
870 XmppAxolotlSession session = new XmppAxolotlSession(account, axolotlStore, address, identityKey);
871 sessions.put(address, session);
872 } else {
873 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Found device " + account.getJid().toBareJid() + ":" + ownId);
874 if (fetchStatusMap.get(address) != FetchStatus.ERROR) {
875 addresses.add(address);
876 } else {
877 Log.d(Config.LOGTAG,getLogprefix(account)+"skipping over "+address+" because it's broken");
878 }
879 }
880 }
881 }
882 }
883
884 return addresses;
885 }
886
887 public boolean createSessionsIfNeeded(final Conversation conversation) {
888 Log.i(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Creating axolotl sessions if needed...");
889 boolean newSessions = false;
890 Set<AxolotlAddress> addresses = findDevicesWithoutSession(conversation);
891 for (AxolotlAddress address : addresses) {
892 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Processing device: " + address.toString());
893 FetchStatus status = fetchStatusMap.get(address);
894 if (status == null || status == FetchStatus.TIMEOUT) {
895 fetchStatusMap.put(address, FetchStatus.PENDING);
896 this.buildSessionFromPEP(address);
897 newSessions = true;
898 } else if (status == FetchStatus.PENDING) {
899 newSessions = true;
900 } else {
901 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Already fetching bundle for " + address.toString());
902 }
903 }
904
905 return newSessions;
906 }
907
908 public boolean trustedSessionVerified(final Conversation conversation) {
909 Set<XmppAxolotlSession> sessions = findSessionsForConversation(conversation);
910 sessions.addAll(findOwnSessions());
911 boolean verified = false;
912 for(XmppAxolotlSession session : sessions) {
913 if (session.getTrust().isTrustedAndActive()) {
914 if (session.getTrust().getTrust() == FingerprintStatus.Trust.VERIFIED_X509) {
915 verified = true;
916 } else {
917 return false;
918 }
919 }
920 }
921 return verified;
922 }
923
924 public boolean hasPendingKeyFetches(Account account, List<Jid> jids) {
925 AxolotlAddress ownAddress = new AxolotlAddress(account.getJid().toBareJid().toPreppedString(), 0);
926 if (fetchStatusMap.getAll(ownAddress).containsValue(FetchStatus.PENDING)) {
927 return true;
928 }
929 for(Jid jid : jids) {
930 AxolotlAddress foreignAddress = new AxolotlAddress(jid.toBareJid().toPreppedString(), 0);
931 if (fetchStatusMap.getAll(foreignAddress).containsValue(FetchStatus.PENDING)) {
932 return true;
933 }
934 }
935 return false;
936 }
937
938 @Nullable
939 private XmppAxolotlMessage buildHeader(Conversation conversation) {
940 final XmppAxolotlMessage axolotlMessage = new XmppAxolotlMessage(
941 account.getJid().toBareJid(), getOwnDeviceId());
942
943 Set<XmppAxolotlSession> remoteSessions = findSessionsForConversation(conversation);
944 Set<XmppAxolotlSession> ownSessions = findOwnSessions();
945 if (remoteSessions.isEmpty()) {
946 return null;
947 }
948 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Building axolotl foreign keyElements...");
949 for (XmppAxolotlSession session : remoteSessions) {
950 Log.v(Config.LOGTAG, AxolotlService.getLogprefix(account) + session.getRemoteAddress().toString());
951 axolotlMessage.addDevice(session);
952 }
953 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Building axolotl own keyElements...");
954 for (XmppAxolotlSession session : ownSessions) {
955 Log.v(Config.LOGTAG, AxolotlService.getLogprefix(account) + session.getRemoteAddress().toString());
956 axolotlMessage.addDevice(session);
957 }
958
959 return axolotlMessage;
960 }
961
962 @Nullable
963 public XmppAxolotlMessage encrypt(Message message) {
964 XmppAxolotlMessage axolotlMessage = buildHeader(message.getConversation());
965
966 if (axolotlMessage != null) {
967 final String content;
968 if (message.hasFileOnRemoteHost()) {
969 content = message.getFileParams().url.toString();
970 } else {
971 content = message.getBody();
972 }
973 try {
974 axolotlMessage.encrypt(content);
975 } catch (CryptoFailedException e) {
976 Log.w(Config.LOGTAG, getLogprefix(account) + "Failed to encrypt message: " + e.getMessage());
977 return null;
978 }
979 }
980
981 return axolotlMessage;
982 }
983
984 public void preparePayloadMessage(final Message message, final boolean delay) {
985 executor.execute(new Runnable() {
986 @Override
987 public void run() {
988 XmppAxolotlMessage axolotlMessage = encrypt(message);
989 if (axolotlMessage == null) {
990 mXmppConnectionService.markMessage(message, Message.STATUS_SEND_FAILED);
991 //mXmppConnectionService.updateConversationUi();
992 } else {
993 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Generated message, caching: " + message.getUuid());
994 messageCache.put(message.getUuid(), axolotlMessage);
995 mXmppConnectionService.resendMessage(message, delay);
996 }
997 }
998 });
999 }
1000
1001 public void prepareKeyTransportMessage(final Conversation conversation, final OnMessageCreatedCallback onMessageCreatedCallback) {
1002 executor.execute(new Runnable() {
1003 @Override
1004 public void run() {
1005 XmppAxolotlMessage axolotlMessage = buildHeader(conversation);
1006 onMessageCreatedCallback.run(axolotlMessage);
1007 }
1008 });
1009 }
1010
1011 public XmppAxolotlMessage fetchAxolotlMessageFromCache(Message message) {
1012 XmppAxolotlMessage axolotlMessage = messageCache.get(message.getUuid());
1013 if (axolotlMessage != null) {
1014 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Cache hit: " + message.getUuid());
1015 messageCache.remove(message.getUuid());
1016 } else {
1017 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Cache miss: " + message.getUuid());
1018 }
1019 return axolotlMessage;
1020 }
1021
1022 private XmppAxolotlSession recreateUncachedSession(AxolotlAddress address) {
1023 IdentityKey identityKey = axolotlStore.loadSession(address).getSessionState().getRemoteIdentityKey();
1024 return (identityKey != null)
1025 ? new XmppAxolotlSession(account, axolotlStore, address, identityKey)
1026 : null;
1027 }
1028
1029 private XmppAxolotlSession getReceivingSession(XmppAxolotlMessage message) {
1030 AxolotlAddress senderAddress = new AxolotlAddress(message.getFrom().toString(),
1031 message.getSenderDeviceId());
1032 XmppAxolotlSession session = sessions.get(senderAddress);
1033 if (session == null) {
1034 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Account: " + account.getJid() + " No axolotl session found while parsing received message " + message);
1035 session = recreateUncachedSession(senderAddress);
1036 if (session == null) {
1037 session = new XmppAxolotlSession(account, axolotlStore, senderAddress);
1038 }
1039 }
1040 return session;
1041 }
1042
1043 public XmppAxolotlMessage.XmppAxolotlPlaintextMessage processReceivingPayloadMessage(XmppAxolotlMessage message) {
1044 XmppAxolotlMessage.XmppAxolotlPlaintextMessage plaintextMessage = null;
1045
1046 XmppAxolotlSession session = getReceivingSession(message);
1047 try {
1048 plaintextMessage = message.decrypt(session, getOwnDeviceId());
1049 Integer preKeyId = session.getPreKeyId();
1050 if (preKeyId != null) {
1051 publishBundlesIfNeeded(false, false);
1052 session.resetPreKeyId();
1053 }
1054 } catch (CryptoFailedException e) {
1055 Log.w(Config.LOGTAG, getLogprefix(account) + "Failed to decrypt message: " + e.getMessage());
1056 }
1057
1058 if (session.isFresh() && plaintextMessage != null) {
1059 putFreshSession(session);
1060 }
1061
1062 return plaintextMessage;
1063 }
1064
1065 public XmppAxolotlMessage.XmppAxolotlKeyTransportMessage processReceivingKeyTransportMessage(XmppAxolotlMessage message) {
1066 XmppAxolotlMessage.XmppAxolotlKeyTransportMessage keyTransportMessage;
1067
1068 XmppAxolotlSession session = getReceivingSession(message);
1069 keyTransportMessage = message.getParameters(session, getOwnDeviceId());
1070
1071 if (session.isFresh() && keyTransportMessage != null) {
1072 putFreshSession(session);
1073 }
1074
1075 return keyTransportMessage;
1076 }
1077
1078 private void putFreshSession(XmppAxolotlSession session) {
1079 Log.d(Config.LOGTAG,"put fresh session");
1080 sessions.put(session);
1081 if (Config.X509_VERIFICATION) {
1082 if (session.getIdentityKey() != null) {
1083 verifySessionWithPEP(session);
1084 } else {
1085 Log.e(Config.LOGTAG,account.getJid().toBareJid()+": identity key was empty after reloading for x509 verification");
1086 }
1087 }
1088 }
1089}