1package eu.siacs.conversations.crypto.axolotl;
2
3import android.support.annotation.NonNull;
4import android.support.annotation.Nullable;
5import android.util.Log;
6
7import org.whispersystems.libaxolotl.AxolotlAddress;
8import org.whispersystems.libaxolotl.DuplicateMessageException;
9import org.whispersystems.libaxolotl.IdentityKey;
10import org.whispersystems.libaxolotl.IdentityKeyPair;
11import org.whispersystems.libaxolotl.InvalidKeyException;
12import org.whispersystems.libaxolotl.InvalidKeyIdException;
13import org.whispersystems.libaxolotl.InvalidMessageException;
14import org.whispersystems.libaxolotl.InvalidVersionException;
15import org.whispersystems.libaxolotl.LegacyMessageException;
16import org.whispersystems.libaxolotl.NoSessionException;
17import org.whispersystems.libaxolotl.SessionBuilder;
18import org.whispersystems.libaxolotl.SessionCipher;
19import org.whispersystems.libaxolotl.UntrustedIdentityException;
20import org.whispersystems.libaxolotl.ecc.Curve;
21import org.whispersystems.libaxolotl.ecc.ECKeyPair;
22import org.whispersystems.libaxolotl.ecc.ECPublicKey;
23import org.whispersystems.libaxolotl.protocol.CiphertextMessage;
24import org.whispersystems.libaxolotl.protocol.PreKeyWhisperMessage;
25import org.whispersystems.libaxolotl.protocol.WhisperMessage;
26import org.whispersystems.libaxolotl.state.AxolotlStore;
27import org.whispersystems.libaxolotl.state.PreKeyBundle;
28import org.whispersystems.libaxolotl.state.PreKeyRecord;
29import org.whispersystems.libaxolotl.state.SessionRecord;
30import org.whispersystems.libaxolotl.state.SignedPreKeyRecord;
31import org.whispersystems.libaxolotl.util.KeyHelper;
32
33import java.util.Arrays;
34import java.util.HashMap;
35import java.util.HashSet;
36import java.util.List;
37import java.util.Map;
38import java.util.Random;
39import java.util.Set;
40
41import eu.siacs.conversations.Config;
42import eu.siacs.conversations.entities.Account;
43import eu.siacs.conversations.entities.Contact;
44import eu.siacs.conversations.entities.Conversation;
45import eu.siacs.conversations.entities.Message;
46import eu.siacs.conversations.parser.IqParser;
47import eu.siacs.conversations.services.XmppConnectionService;
48import eu.siacs.conversations.utils.SerialSingleThreadExecutor;
49import eu.siacs.conversations.xml.Element;
50import eu.siacs.conversations.xmpp.OnIqPacketReceived;
51import eu.siacs.conversations.xmpp.jid.InvalidJidException;
52import eu.siacs.conversations.xmpp.jid.Jid;
53import eu.siacs.conversations.xmpp.stanzas.IqPacket;
54import eu.siacs.conversations.xmpp.stanzas.MessagePacket;
55
56public class AxolotlService {
57
58 public static final String PEP_PREFIX = "eu.siacs.conversations.axolotl";
59 public static final String PEP_DEVICE_LIST = PEP_PREFIX + ".devicelist";
60 public static final String PEP_BUNDLES = PEP_PREFIX + ".bundles";
61
62 public static final String LOGPREFIX = "AxolotlService";
63
64 public static final int NUM_KEYS_TO_PUBLISH = 10;
65
66 private final Account account;
67 private final XmppConnectionService mXmppConnectionService;
68 private final SQLiteAxolotlStore axolotlStore;
69 private final SessionMap sessions;
70 private final Map<Jid, Set<Integer>> deviceIds;
71 private final Map<String, MessagePacket> messageCache;
72 private final FetchStatusMap fetchStatusMap;
73 private final SerialSingleThreadExecutor executor;
74
75 public static class SQLiteAxolotlStore implements AxolotlStore {
76
77 public static final String PREKEY_TABLENAME = "prekeys";
78 public static final String SIGNED_PREKEY_TABLENAME = "signed_prekeys";
79 public static final String SESSION_TABLENAME = "sessions";
80 public static final String IDENTITIES_TABLENAME = "identities";
81 public static final String ACCOUNT = "account";
82 public static final String DEVICE_ID = "device_id";
83 public static final String ID = "id";
84 public static final String KEY = "key";
85 public static final String FINGERPRINT = "fingerprint";
86 public static final String NAME = "name";
87 public static final String TRUSTED = "trusted";
88 public static final String OWN = "ownkey";
89
90 public static final String JSONKEY_REGISTRATION_ID = "axolotl_reg_id";
91 public static final String JSONKEY_CURRENT_PREKEY_ID = "axolotl_cur_prekey_id";
92
93 private final Account account;
94 private final XmppConnectionService mXmppConnectionService;
95
96 private IdentityKeyPair identityKeyPair;
97 private int localRegistrationId;
98 private int currentPreKeyId = 0;
99
100 public enum Trust {
101 UNDECIDED, // 0
102 TRUSTED,
103 UNTRUSTED;
104
105 public String toString() {
106 switch(this){
107 case UNDECIDED:
108 return "Trust undecided";
109 case TRUSTED:
110 return "Trusted";
111 case UNTRUSTED:
112 default:
113 return "Untrusted";
114 }
115 }
116
117 public static Trust fromBoolean(Boolean trusted) {
118 return trusted?TRUSTED:UNTRUSTED;
119 }
120 };
121
122 private static IdentityKeyPair generateIdentityKeyPair() {
123 Log.i(Config.LOGTAG, AxolotlService.LOGPREFIX+" : "+"Generating axolotl IdentityKeyPair...");
124 ECKeyPair identityKeyPairKeys = Curve.generateKeyPair();
125 IdentityKeyPair ownKey = new IdentityKeyPair(new IdentityKey(identityKeyPairKeys.getPublicKey()),
126 identityKeyPairKeys.getPrivateKey());
127 return ownKey;
128 }
129
130 private static int generateRegistrationId() {
131 Log.i(Config.LOGTAG, AxolotlService.LOGPREFIX+" : "+"Generating axolotl registration ID...");
132 int reg_id = KeyHelper.generateRegistrationId(true);
133 return reg_id;
134 }
135
136 public SQLiteAxolotlStore(Account account, XmppConnectionService service) {
137 this.account = account;
138 this.mXmppConnectionService = service;
139 this.localRegistrationId = loadRegistrationId();
140 this.currentPreKeyId = loadCurrentPreKeyId();
141 for (SignedPreKeyRecord record : loadSignedPreKeys()) {
142 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account)+"Got Axolotl signed prekey record:" + record.getId());
143 }
144 }
145
146 public int getCurrentPreKeyId() {
147 return currentPreKeyId;
148 }
149
150 // --------------------------------------
151 // IdentityKeyStore
152 // --------------------------------------
153
154 private IdentityKeyPair loadIdentityKeyPair() {
155 String ownName = account.getJid().toBareJid().toString();
156 IdentityKeyPair ownKey = mXmppConnectionService.databaseBackend.loadOwnIdentityKeyPair(account,
157 ownName);
158
159 if (ownKey != null) {
160 return ownKey;
161 } else {
162 Log.i(Config.LOGTAG, AxolotlService.getLogprefix(account)+"Could not retrieve axolotl key for account " + ownName);
163 ownKey = generateIdentityKeyPair();
164 mXmppConnectionService.databaseBackend.storeOwnIdentityKeyPair(account, ownName, ownKey);
165 }
166 return ownKey;
167 }
168
169 private int loadRegistrationId() {
170 return loadRegistrationId(false);
171 }
172
173 private int loadRegistrationId(boolean regenerate) {
174 String regIdString = this.account.getKey(JSONKEY_REGISTRATION_ID);
175 int reg_id;
176 if (!regenerate && regIdString != null) {
177 reg_id = Integer.valueOf(regIdString);
178 } else {
179 Log.i(Config.LOGTAG, AxolotlService.getLogprefix(account)+"Could not retrieve axolotl registration id for account " + account.getJid());
180 reg_id = generateRegistrationId();
181 boolean success = this.account.setKey(JSONKEY_REGISTRATION_ID, Integer.toString(reg_id));
182 if (success) {
183 mXmppConnectionService.databaseBackend.updateAccount(account);
184 } else {
185 Log.e(Config.LOGTAG, AxolotlService.getLogprefix(account)+"Failed to write new key to the database!");
186 }
187 }
188 return reg_id;
189 }
190
191 private int loadCurrentPreKeyId() {
192 String regIdString = this.account.getKey(JSONKEY_CURRENT_PREKEY_ID);
193 int reg_id;
194 if (regIdString != null) {
195 reg_id = Integer.valueOf(regIdString);
196 } else {
197 Log.w(Config.LOGTAG, AxolotlService.getLogprefix(account)+"Could not retrieve current prekey id for account " + account.getJid());
198 reg_id = 0;
199 }
200 return reg_id;
201 }
202
203 public void regenerate() {
204 mXmppConnectionService.databaseBackend.wipeAxolotlDb(account);
205 account.setKey(JSONKEY_CURRENT_PREKEY_ID, Integer.toString(0));
206 identityKeyPair = loadIdentityKeyPair();
207 localRegistrationId = loadRegistrationId(true);
208 currentPreKeyId = 0;
209 mXmppConnectionService.updateAccountUi();
210 }
211
212 /**
213 * Get the local client's identity key pair.
214 *
215 * @return The local client's persistent identity key pair.
216 */
217 @Override
218 public IdentityKeyPair getIdentityKeyPair() {
219 if(identityKeyPair == null) {
220 identityKeyPair = loadIdentityKeyPair();
221 }
222 return identityKeyPair;
223 }
224
225 /**
226 * Return the local client's registration ID.
227 * <p/>
228 * Clients should maintain a registration ID, a random number
229 * between 1 and 16380 that's generated once at install time.
230 *
231 * @return the local client's registration ID.
232 */
233 @Override
234 public int getLocalRegistrationId() {
235 return localRegistrationId;
236 }
237
238 /**
239 * Save a remote client's identity key
240 * <p/>
241 * Store a remote client's identity key as trusted.
242 *
243 * @param name The name of the remote client.
244 * @param identityKey The remote client's identity key.
245 */
246 @Override
247 public void saveIdentity(String name, IdentityKey identityKey) {
248 if(!mXmppConnectionService.databaseBackend.loadIdentityKeys(account, name).contains(identityKey)) {
249 mXmppConnectionService.databaseBackend.storeIdentityKey(account, name, identityKey);
250 }
251 }
252
253 /**
254 * Verify a remote client's identity key.
255 * <p/>
256 * Determine whether a remote client's identity is trusted. Convention is
257 * that the TextSecure protocol is 'trust on first use.' This means that
258 * an identity key is considered 'trusted' if there is no entry for the recipient
259 * in the local store, or if it matches the saved key for a recipient in the local
260 * store. Only if it mismatches an entry in the local store is it considered
261 * 'untrusted.'
262 *
263 * @param name The name of the remote client.
264 * @param identityKey The identity key to verify.
265 * @return true if trusted, false if untrusted.
266 */
267 @Override
268 public boolean isTrustedIdentity(String name, IdentityKey identityKey) {
269 return true;
270 }
271
272 public Trust getFingerprintTrust(String fingerprint) {
273 return mXmppConnectionService.databaseBackend.isIdentityKeyTrusted(account, fingerprint);
274 }
275
276 public void setFingerprintTrust(String fingerprint, Trust trust) {
277 mXmppConnectionService.databaseBackend.setIdentityKeyTrust(account, fingerprint, trust);
278 }
279
280 public Set<IdentityKey> getContactUndecidedKeys(String bareJid) {
281 return mXmppConnectionService.databaseBackend.loadIdentityKeys(account, bareJid, Trust.UNDECIDED);
282 }
283
284 public long getContactNumTrustedKeys(String bareJid) {
285 return mXmppConnectionService.databaseBackend.numTrustedKeys(account, bareJid);
286 }
287
288 // --------------------------------------
289 // SessionStore
290 // --------------------------------------
291
292 /**
293 * Returns a copy of the {@link SessionRecord} corresponding to the recipientId + deviceId tuple,
294 * or a new SessionRecord if one does not currently exist.
295 * <p/>
296 * It is important that implementations return a copy of the current durable information. The
297 * returned SessionRecord may be modified, but those changes should not have an effect on the
298 * durable session state (what is returned by subsequent calls to this method) without the
299 * store method being called here first.
300 *
301 * @param address The name and device ID of the remote client.
302 * @return a copy of the SessionRecord corresponding to the recipientId + deviceId tuple, or
303 * a new SessionRecord if one does not currently exist.
304 */
305 @Override
306 public SessionRecord loadSession(AxolotlAddress address) {
307 SessionRecord session = mXmppConnectionService.databaseBackend.loadSession(this.account, address);
308 return (session != null) ? session : new SessionRecord();
309 }
310
311 /**
312 * Returns all known devices with active sessions for a recipient
313 *
314 * @param name the name of the client.
315 * @return all known sub-devices with active sessions.
316 */
317 @Override
318 public List<Integer> getSubDeviceSessions(String name) {
319 return mXmppConnectionService.databaseBackend.getSubDeviceSessions(account,
320 new AxolotlAddress(name, 0));
321 }
322
323 /**
324 * Commit to storage the {@link SessionRecord} for a given recipientId + deviceId tuple.
325 *
326 * @param address the address of the remote client.
327 * @param record the current SessionRecord for the remote client.
328 */
329 @Override
330 public void storeSession(AxolotlAddress address, SessionRecord record) {
331 mXmppConnectionService.databaseBackend.storeSession(account, address, record);
332 }
333
334 /**
335 * Determine whether there is a committed {@link SessionRecord} for a recipientId + deviceId tuple.
336 *
337 * @param address the address of the remote client.
338 * @return true if a {@link SessionRecord} exists, false otherwise.
339 */
340 @Override
341 public boolean containsSession(AxolotlAddress address) {
342 return mXmppConnectionService.databaseBackend.containsSession(account, address);
343 }
344
345 /**
346 * Remove a {@link SessionRecord} for a recipientId + deviceId tuple.
347 *
348 * @param address the address of the remote client.
349 */
350 @Override
351 public void deleteSession(AxolotlAddress address) {
352 mXmppConnectionService.databaseBackend.deleteSession(account, address);
353 }
354
355 /**
356 * Remove the {@link SessionRecord}s corresponding to all devices of a recipientId.
357 *
358 * @param name the name of the remote client.
359 */
360 @Override
361 public void deleteAllSessions(String name) {
362 mXmppConnectionService.databaseBackend.deleteAllSessions(account,
363 new AxolotlAddress(name, 0));
364 }
365
366 // --------------------------------------
367 // PreKeyStore
368 // --------------------------------------
369
370 /**
371 * Load a local PreKeyRecord.
372 *
373 * @param preKeyId the ID of the local PreKeyRecord.
374 * @return the corresponding PreKeyRecord.
375 * @throws InvalidKeyIdException when there is no corresponding PreKeyRecord.
376 */
377 @Override
378 public PreKeyRecord loadPreKey(int preKeyId) throws InvalidKeyIdException {
379 PreKeyRecord record = mXmppConnectionService.databaseBackend.loadPreKey(account, preKeyId);
380 if (record == null) {
381 throw new InvalidKeyIdException("No such PreKeyRecord: " + preKeyId);
382 }
383 return record;
384 }
385
386 /**
387 * Store a local PreKeyRecord.
388 *
389 * @param preKeyId the ID of the PreKeyRecord to store.
390 * @param record the PreKeyRecord.
391 */
392 @Override
393 public void storePreKey(int preKeyId, PreKeyRecord record) {
394 mXmppConnectionService.databaseBackend.storePreKey(account, record);
395 currentPreKeyId = preKeyId;
396 boolean success = this.account.setKey(JSONKEY_CURRENT_PREKEY_ID, Integer.toString(preKeyId));
397 if (success) {
398 mXmppConnectionService.databaseBackend.updateAccount(account);
399 } else {
400 Log.e(Config.LOGTAG, AxolotlService.getLogprefix(account)+"Failed to write new prekey id to the database!");
401 }
402 }
403
404 /**
405 * @param preKeyId A PreKeyRecord ID.
406 * @return true if the store has a record for the preKeyId, otherwise false.
407 */
408 @Override
409 public boolean containsPreKey(int preKeyId) {
410 return mXmppConnectionService.databaseBackend.containsPreKey(account, preKeyId);
411 }
412
413 /**
414 * Delete a PreKeyRecord from local storage.
415 *
416 * @param preKeyId The ID of the PreKeyRecord to remove.
417 */
418 @Override
419 public void removePreKey(int preKeyId) {
420 mXmppConnectionService.databaseBackend.deletePreKey(account, preKeyId);
421 }
422
423 // --------------------------------------
424 // SignedPreKeyStore
425 // --------------------------------------
426
427 /**
428 * Load a local SignedPreKeyRecord.
429 *
430 * @param signedPreKeyId the ID of the local SignedPreKeyRecord.
431 * @return the corresponding SignedPreKeyRecord.
432 * @throws InvalidKeyIdException when there is no corresponding SignedPreKeyRecord.
433 */
434 @Override
435 public SignedPreKeyRecord loadSignedPreKey(int signedPreKeyId) throws InvalidKeyIdException {
436 SignedPreKeyRecord record = mXmppConnectionService.databaseBackend.loadSignedPreKey(account, signedPreKeyId);
437 if (record == null) {
438 throw new InvalidKeyIdException("No such SignedPreKeyRecord: " + signedPreKeyId);
439 }
440 return record;
441 }
442
443 /**
444 * Load all local SignedPreKeyRecords.
445 *
446 * @return All stored SignedPreKeyRecords.
447 */
448 @Override
449 public List<SignedPreKeyRecord> loadSignedPreKeys() {
450 return mXmppConnectionService.databaseBackend.loadSignedPreKeys(account);
451 }
452
453 /**
454 * Store a local SignedPreKeyRecord.
455 *
456 * @param signedPreKeyId the ID of the SignedPreKeyRecord to store.
457 * @param record the SignedPreKeyRecord.
458 */
459 @Override
460 public void storeSignedPreKey(int signedPreKeyId, SignedPreKeyRecord record) {
461 mXmppConnectionService.databaseBackend.storeSignedPreKey(account, record);
462 }
463
464 /**
465 * @param signedPreKeyId A SignedPreKeyRecord ID.
466 * @return true if the store has a record for the signedPreKeyId, otherwise false.
467 */
468 @Override
469 public boolean containsSignedPreKey(int signedPreKeyId) {
470 return mXmppConnectionService.databaseBackend.containsSignedPreKey(account, signedPreKeyId);
471 }
472
473 /**
474 * Delete a SignedPreKeyRecord from local storage.
475 *
476 * @param signedPreKeyId The ID of the SignedPreKeyRecord to remove.
477 */
478 @Override
479 public void removeSignedPreKey(int signedPreKeyId) {
480 mXmppConnectionService.databaseBackend.deleteSignedPreKey(account, signedPreKeyId);
481 }
482 }
483
484 public static class XmppAxolotlSession {
485 private final SessionCipher cipher;
486 private Integer preKeyId = null;
487 private final SQLiteAxolotlStore sqLiteAxolotlStore;
488 private final AxolotlAddress remoteAddress;
489 private final Account account;
490 private String fingerprint = null;
491
492 public XmppAxolotlSession(Account account, SQLiteAxolotlStore store, AxolotlAddress remoteAddress, String fingerprint) {
493 this(account, store, remoteAddress);
494 this.fingerprint = fingerprint;
495 }
496
497 public XmppAxolotlSession(Account account, SQLiteAxolotlStore store, AxolotlAddress remoteAddress) {
498 this.cipher = new SessionCipher(store, remoteAddress);
499 this.remoteAddress = remoteAddress;
500 this.sqLiteAxolotlStore = store;
501 this.account = account;
502 }
503
504 public Integer getPreKeyId() {
505 return preKeyId;
506 }
507
508 public void resetPreKeyId() {
509
510 preKeyId = null;
511 }
512
513 public String getFingerprint() {
514 return fingerprint;
515 }
516
517 public byte[] processReceiving(XmppAxolotlMessage.XmppAxolotlMessageHeader incomingHeader) {
518 byte[] plaintext = null;
519 try {
520 try {
521 PreKeyWhisperMessage message = new PreKeyWhisperMessage(incomingHeader.getContents());
522 Log.i(Config.LOGTAG, AxolotlService.getLogprefix(account)+"PreKeyWhisperMessage received, new session ID:" + message.getSignedPreKeyId() + "/" + message.getPreKeyId());
523 String fingerprint = message.getIdentityKey().getFingerprint().replaceAll("\\s", "");
524 if (this.fingerprint != null && !this.fingerprint.equals(fingerprint)) {
525 Log.e(Config.LOGTAG, AxolotlService.getLogprefix(account)+"Had session with fingerprint "+ this.fingerprint+", received message with fingerprint "+fingerprint);
526 } else {
527 this.fingerprint = fingerprint;
528 plaintext = cipher.decrypt(message);
529 if (message.getPreKeyId().isPresent()) {
530 preKeyId = message.getPreKeyId().get();
531 }
532 }
533 } catch (InvalidMessageException | InvalidVersionException e) {
534 Log.i(Config.LOGTAG, AxolotlService.getLogprefix(account)+"WhisperMessage received");
535 WhisperMessage message = new WhisperMessage(incomingHeader.getContents());
536 plaintext = cipher.decrypt(message);
537 } catch (InvalidKeyException | InvalidKeyIdException | UntrustedIdentityException e) {
538 Log.w(Config.LOGTAG, AxolotlService.getLogprefix(account)+"Error decrypting axolotl header, "+e.getClass().getName()+": " + e.getMessage());
539 }
540 } catch (LegacyMessageException | InvalidMessageException | DuplicateMessageException | NoSessionException e) {
541 Log.w(Config.LOGTAG, AxolotlService.getLogprefix(account)+"Error decrypting axolotl header, "+e.getClass().getName()+": " + e.getMessage());
542 }
543 return plaintext;
544 }
545
546 public XmppAxolotlMessage.XmppAxolotlMessageHeader processSending(byte[] outgoingMessage) {
547 CiphertextMessage ciphertextMessage = cipher.encrypt(outgoingMessage);
548 XmppAxolotlMessage.XmppAxolotlMessageHeader header =
549 new XmppAxolotlMessage.XmppAxolotlMessageHeader(remoteAddress.getDeviceId(),
550 ciphertextMessage.serialize());
551 return header;
552 }
553 }
554
555 private static class AxolotlAddressMap<T> {
556 protected Map<String, Map<Integer, T>> map;
557 protected final Object MAP_LOCK = new Object();
558
559 public AxolotlAddressMap() {
560 this.map = new HashMap<>();
561 }
562
563 public void put(AxolotlAddress address, T value) {
564 synchronized (MAP_LOCK) {
565 Map<Integer, T> devices = map.get(address.getName());
566 if (devices == null) {
567 devices = new HashMap<>();
568 map.put(address.getName(), devices);
569 }
570 devices.put(address.getDeviceId(), value);
571 }
572 }
573
574 public T get(AxolotlAddress address) {
575 synchronized (MAP_LOCK) {
576 Map<Integer, T> devices = map.get(address.getName());
577 if (devices == null) {
578 return null;
579 }
580 return devices.get(address.getDeviceId());
581 }
582 }
583
584 public Map<Integer, T> getAll(AxolotlAddress address) {
585 synchronized (MAP_LOCK) {
586 Map<Integer, T> devices = map.get(address.getName());
587 if (devices == null) {
588 return new HashMap<>();
589 }
590 return devices;
591 }
592 }
593
594 public boolean hasAny(AxolotlAddress address) {
595 synchronized (MAP_LOCK) {
596 Map<Integer, T> devices = map.get(address.getName());
597 return devices != null && !devices.isEmpty();
598 }
599 }
600
601 public void clear() {
602 map.clear();
603 }
604
605 }
606
607 private static class SessionMap extends AxolotlAddressMap<XmppAxolotlSession> {
608 private final XmppConnectionService xmppConnectionService;
609 private final Account account;
610
611 public SessionMap(XmppConnectionService service, SQLiteAxolotlStore store, Account account) {
612 super();
613 this.xmppConnectionService = service;
614 this.account = account;
615 this.fillMap(store);
616 }
617
618 private void fillMap(SQLiteAxolotlStore store) {
619 for (Contact contact : account.getRoster().getContacts()) {
620 Jid bareJid = contact.getJid().toBareJid();
621 if (bareJid == null) {
622 continue; // FIXME: handle this?
623 }
624 String address = bareJid.toString();
625 List<Integer> deviceIDs = store.getSubDeviceSessions(address);
626 for (Integer deviceId : deviceIDs) {
627 AxolotlAddress axolotlAddress = new AxolotlAddress(address, deviceId);
628 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account)+"Building session for remote address: "+axolotlAddress.toString());
629 String fingerprint = store.loadSession(axolotlAddress).getSessionState().getRemoteIdentityKey().getFingerprint().replaceAll("\\s", "");
630 this.put(axolotlAddress, new XmppAxolotlSession(account, store, axolotlAddress, fingerprint));
631 }
632 }
633 }
634
635 @Override
636 public void put(AxolotlAddress address, XmppAxolotlSession value) {
637 super.put(address, value);
638 xmppConnectionService.syncRosterToDisk(account);
639 }
640 }
641
642 private static enum FetchStatus {
643 PENDING,
644 SUCCESS,
645 ERROR
646 }
647
648 private static class FetchStatusMap extends AxolotlAddressMap<FetchStatus> {
649
650 }
651
652 public static String getLogprefix(Account account) {
653 return LOGPREFIX+" ("+account.getJid().toBareJid().toString()+"): ";
654 }
655
656 public AxolotlService(Account account, XmppConnectionService connectionService) {
657 this.mXmppConnectionService = connectionService;
658 this.account = account;
659 this.axolotlStore = new SQLiteAxolotlStore(this.account, this.mXmppConnectionService);
660 this.deviceIds = new HashMap<>();
661 this.messageCache = new HashMap<>();
662 this.sessions = new SessionMap(mXmppConnectionService, axolotlStore, account);
663 this.fetchStatusMap = new FetchStatusMap();
664 this.executor = new SerialSingleThreadExecutor();
665 }
666
667 public IdentityKey getOwnPublicKey() {
668 return axolotlStore.getIdentityKeyPair().getPublicKey();
669 }
670
671 public Set<IdentityKey> getPendingKeys() {
672 return axolotlStore.getContactUndecidedKeys(account.getJid().toBareJid().toString());
673 }
674
675 public Set<IdentityKey> getPendingKeys(Contact contact) {
676 return axolotlStore.getContactUndecidedKeys(contact.getJid().toBareJid().toString());
677 }
678
679 public long getNumTrustedKeys(Contact contact) {
680 return axolotlStore.getContactNumTrustedKeys(contact.getJid().toBareJid().toString());
681 }
682
683 private AxolotlAddress getAddressForJid(Jid jid) {
684 return new AxolotlAddress(jid.toString(), 0);
685 }
686
687 private Set<XmppAxolotlSession> findOwnSessions() {
688 AxolotlAddress ownAddress = getAddressForJid(account.getJid().toBareJid());
689 Set<XmppAxolotlSession> ownDeviceSessions = new HashSet<>(this.sessions.getAll(ownAddress).values());
690 return ownDeviceSessions;
691 }
692
693 private Set<XmppAxolotlSession> findSessionsforContact(Contact contact) {
694 AxolotlAddress contactAddress = getAddressForJid(contact.getJid());
695 Set<XmppAxolotlSession> sessions = new HashSet<>(this.sessions.getAll(contactAddress).values());
696 return sessions;
697 }
698
699 private boolean hasAny(Contact contact) {
700 AxolotlAddress contactAddress = getAddressForJid(contact.getJid());
701 return sessions.hasAny(contactAddress);
702 }
703
704 public void regenerateKeys() {
705 axolotlStore.regenerate();
706 sessions.clear();
707 fetchStatusMap.clear();
708 publishBundlesIfNeeded();
709 publishOwnDeviceIdIfNeeded();
710 }
711
712 public int getOwnDeviceId() {
713 return axolotlStore.loadRegistrationId();
714 }
715
716 public Set<Integer> getOwnDeviceIds() {
717 return this.deviceIds.get(account.getJid().toBareJid());
718 }
719
720 public void registerDevices(final Jid jid, @NonNull final Set<Integer> deviceIds) {
721 if(deviceIds.contains(getOwnDeviceId())) {
722 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account)+"Skipping own Device ID:"+ jid + ":"+getOwnDeviceId());
723 deviceIds.remove(getOwnDeviceId());
724 }
725 for(Integer i:deviceIds) {
726 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account)+"Adding Device ID:"+ jid + ":"+i);
727 }
728 this.deviceIds.put(jid, deviceIds);
729 publishOwnDeviceIdIfNeeded();
730 }
731
732 public void wipeOtherPepDevices() {
733 Set<Integer> deviceIds = new HashSet<>();
734 deviceIds.add(getOwnDeviceId());
735 IqPacket publish = mXmppConnectionService.getIqGenerator().publishDeviceIds(deviceIds);
736 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account)+"Wiping all other devices from Pep:" + publish);
737 mXmppConnectionService.sendIqPacket(account, publish, new OnIqPacketReceived() {
738 @Override
739 public void onIqPacketReceived(Account account, IqPacket packet) {
740 // TODO: implement this!
741 }
742 });
743 }
744
745 public void publishOwnDeviceIdIfNeeded() {
746 IqPacket packet = mXmppConnectionService.getIqGenerator().retrieveDeviceIds(account.getJid().toBareJid());
747 mXmppConnectionService.sendIqPacket(account, packet, new OnIqPacketReceived() {
748 @Override
749 public void onIqPacketReceived(Account account, IqPacket packet) {
750 Element item = mXmppConnectionService.getIqParser().getItem(packet);
751 Set<Integer> deviceIds = mXmppConnectionService.getIqParser().deviceIds(item);
752 if (deviceIds == null) {
753 deviceIds = new HashSet<Integer>();
754 }
755 if (!deviceIds.contains(getOwnDeviceId())) {
756 deviceIds.add(getOwnDeviceId());
757 IqPacket publish = mXmppConnectionService.getIqGenerator().publishDeviceIds(deviceIds);
758 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account)+"Own device " + getOwnDeviceId() + " not in PEP devicelist. Publishing: " + publish);
759 mXmppConnectionService.sendIqPacket(account, publish, new OnIqPacketReceived() {
760 @Override
761 public void onIqPacketReceived(Account account, IqPacket packet) {
762 // TODO: implement this!
763 }
764 });
765 }
766 }
767 });
768 }
769
770 public void publishBundlesIfNeeded() {
771 IqPacket packet = mXmppConnectionService.getIqGenerator().retrieveBundlesForDevice(account.getJid().toBareJid(), getOwnDeviceId());
772 mXmppConnectionService.sendIqPacket(account, packet, new OnIqPacketReceived() {
773 @Override
774 public void onIqPacketReceived(Account account, IqPacket packet) {
775 PreKeyBundle bundle = mXmppConnectionService.getIqParser().bundle(packet);
776 Map<Integer, ECPublicKey> keys = mXmppConnectionService.getIqParser().preKeyPublics(packet);
777 boolean flush = false;
778 if (bundle == null) {
779 Log.w(Config.LOGTAG, AxolotlService.getLogprefix(account)+"Received invalid bundle:" + packet);
780 bundle = new PreKeyBundle(-1, -1, -1 , null, -1, null, null, null);
781 flush = true;
782 }
783 if (keys == null) {
784 Log.w(Config.LOGTAG, AxolotlService.getLogprefix(account)+"Received invalid prekeys:" + packet);
785 }
786 try {
787 boolean changed = false;
788 // Validate IdentityKey
789 IdentityKeyPair identityKeyPair = axolotlStore.getIdentityKeyPair();
790 if (flush || !identityKeyPair.getPublicKey().equals(bundle.getIdentityKey())) {
791 Log.i(Config.LOGTAG, AxolotlService.getLogprefix(account)+"Adding own IdentityKey " + identityKeyPair.getPublicKey() + " to PEP.");
792 changed = true;
793 }
794
795 // Validate signedPreKeyRecord + ID
796 SignedPreKeyRecord signedPreKeyRecord;
797 int numSignedPreKeys = axolotlStore.loadSignedPreKeys().size();
798 try {
799 signedPreKeyRecord = axolotlStore.loadSignedPreKey(bundle.getSignedPreKeyId());
800 if ( flush
801 ||!bundle.getSignedPreKey().equals(signedPreKeyRecord.getKeyPair().getPublicKey())
802 || !Arrays.equals(bundle.getSignedPreKeySignature(), signedPreKeyRecord.getSignature())) {
803 Log.i(Config.LOGTAG, AxolotlService.getLogprefix(account)+"Adding new signedPreKey with ID " + (numSignedPreKeys + 1) + " to PEP.");
804 signedPreKeyRecord = KeyHelper.generateSignedPreKey(identityKeyPair, numSignedPreKeys + 1);
805 axolotlStore.storeSignedPreKey(signedPreKeyRecord.getId(), signedPreKeyRecord);
806 changed = true;
807 }
808 } catch (InvalidKeyIdException e) {
809 Log.i(Config.LOGTAG, AxolotlService.getLogprefix(account)+"Adding new signedPreKey with ID " + (numSignedPreKeys + 1) + " to PEP.");
810 signedPreKeyRecord = KeyHelper.generateSignedPreKey(identityKeyPair, numSignedPreKeys + 1);
811 axolotlStore.storeSignedPreKey(signedPreKeyRecord.getId(), signedPreKeyRecord);
812 changed = true;
813 }
814
815 // Validate PreKeys
816 Set<PreKeyRecord> preKeyRecords = new HashSet<>();
817 if (keys != null) {
818 for (Integer id : keys.keySet()) {
819 try {
820 PreKeyRecord preKeyRecord = axolotlStore.loadPreKey(id);
821 if (preKeyRecord.getKeyPair().getPublicKey().equals(keys.get(id))) {
822 preKeyRecords.add(preKeyRecord);
823 }
824 } catch (InvalidKeyIdException ignored) {
825 }
826 }
827 }
828 int newKeys = NUM_KEYS_TO_PUBLISH - preKeyRecords.size();
829 if (newKeys > 0) {
830 List<PreKeyRecord> newRecords = KeyHelper.generatePreKeys(
831 axolotlStore.getCurrentPreKeyId()+1, newKeys);
832 preKeyRecords.addAll(newRecords);
833 for (PreKeyRecord record : newRecords) {
834 axolotlStore.storePreKey(record.getId(), record);
835 }
836 changed = true;
837 Log.i(Config.LOGTAG, AxolotlService.getLogprefix(account)+"Adding " + newKeys + " new preKeys to PEP.");
838 }
839
840
841 if(changed) {
842 IqPacket publish = mXmppConnectionService.getIqGenerator().publishBundles(
843 signedPreKeyRecord, axolotlStore.getIdentityKeyPair().getPublicKey(),
844 preKeyRecords, getOwnDeviceId());
845 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account)+ ": Bundle " + getOwnDeviceId() + " in PEP not current. Publishing: " + publish);
846 mXmppConnectionService.sendIqPacket(account, publish, new OnIqPacketReceived() {
847 @Override
848 public void onIqPacketReceived(Account account, IqPacket packet) {
849 // TODO: implement this!
850 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account)+"Published bundle, got: " + packet);
851 }
852 });
853 }
854 } catch (InvalidKeyException e) {
855 Log.e(Config.LOGTAG, AxolotlService.getLogprefix(account)+"Failed to publish bundle " + getOwnDeviceId() + ", reason: " + e.getMessage());
856 return;
857 }
858 }
859 });
860 }
861
862 public boolean isContactAxolotlCapable(Contact contact) {
863
864 Jid jid = contact.getJid().toBareJid();
865 AxolotlAddress address = new AxolotlAddress(jid.toString(), 0);
866 return sessions.hasAny(address) ||
867 ( deviceIds.containsKey(jid) && !deviceIds.get(jid).isEmpty());
868 }
869 public SQLiteAxolotlStore.Trust getFingerprintTrust(String fingerprint) {
870 return axolotlStore.getFingerprintTrust(fingerprint);
871 }
872
873 public void setFingerprintTrust(String fingerprint, SQLiteAxolotlStore.Trust trust) {
874 axolotlStore.setFingerprintTrust(fingerprint, trust);
875 }
876
877 private void buildSessionFromPEP(final Conversation conversation, final AxolotlAddress address, final boolean flushWaitingQueueAfterFetch) {
878 Log.i(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Building new sesstion for " + address.getDeviceId());
879
880 try {
881 IqPacket bundlesPacket = mXmppConnectionService.getIqGenerator().retrieveBundlesForDevice(
882 Jid.fromString(address.getName()), address.getDeviceId());
883 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account)+"Retrieving bundle: " + bundlesPacket);
884 mXmppConnectionService.sendIqPacket(account, bundlesPacket, new OnIqPacketReceived() {
885 private void finish() {
886 AxolotlAddress ownAddress = new AxolotlAddress(conversation.getAccount().getJid().toBareJid().toString(),0);
887 AxolotlAddress foreignAddress = new AxolotlAddress(conversation.getJid().toBareJid().toString(),0);
888 if (!fetchStatusMap.getAll(ownAddress).containsValue(FetchStatus.PENDING)
889 && !fetchStatusMap.getAll(foreignAddress).containsValue(FetchStatus.PENDING)) {
890 if (flushWaitingQueueAfterFetch) {
891 conversation.findUnsentMessagesWithEncryption(Message.ENCRYPTION_AXOLOTL,
892 new Conversation.OnMessageFound() {
893 @Override
894 public void onMessageFound(Message message) {
895 processSending(message,false);
896 }
897 });
898 }
899 mXmppConnectionService.newKeysAvailable();
900 }
901 }
902
903 @Override
904 public void onIqPacketReceived(Account account, IqPacket packet) {
905 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account)+"Received preKey IQ packet, processing...");
906 final IqParser parser = mXmppConnectionService.getIqParser();
907 final List<PreKeyBundle> preKeyBundleList = parser.preKeys(packet);
908 final PreKeyBundle bundle = parser.bundle(packet);
909 if (preKeyBundleList.isEmpty() || bundle == null) {
910 Log.e(Config.LOGTAG, AxolotlService.getLogprefix(account)+"preKey IQ packet invalid: " + packet);
911 fetchStatusMap.put(address, FetchStatus.ERROR);
912 finish();
913 return;
914 }
915 Random random = new Random();
916 final PreKeyBundle preKey = preKeyBundleList.get(random.nextInt(preKeyBundleList.size()));
917 if (preKey == null) {
918 //should never happen
919 fetchStatusMap.put(address, FetchStatus.ERROR);
920 finish();
921 return;
922 }
923
924 final PreKeyBundle preKeyBundle = new PreKeyBundle(0, address.getDeviceId(),
925 preKey.getPreKeyId(), preKey.getPreKey(),
926 bundle.getSignedPreKeyId(), bundle.getSignedPreKey(),
927 bundle.getSignedPreKeySignature(), bundle.getIdentityKey());
928
929 axolotlStore.saveIdentity(address.getName(), bundle.getIdentityKey());
930
931 try {
932 SessionBuilder builder = new SessionBuilder(axolotlStore, address);
933 builder.process(preKeyBundle);
934 XmppAxolotlSession session = new XmppAxolotlSession(account, axolotlStore, address, bundle.getIdentityKey().getFingerprint().replaceAll("\\s", ""));
935 sessions.put(address, session);
936 fetchStatusMap.put(address, FetchStatus.SUCCESS);
937 } catch (UntrustedIdentityException|InvalidKeyException e) {
938 Log.e(Config.LOGTAG, AxolotlService.getLogprefix(account)+"Error building session for " + address + ": "
939 + e.getClass().getName() + ", " + e.getMessage());
940 fetchStatusMap.put(address, FetchStatus.ERROR);
941 }
942
943 finish();
944 }
945 });
946 } catch (InvalidJidException e) {
947 Log.e(Config.LOGTAG, AxolotlService.getLogprefix(account)+"Got address with invalid jid: " + address.getName());
948 }
949 }
950
951 public Set<AxolotlAddress> findDevicesWithoutSession(final Conversation conversation) {
952 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Finding devices without session for " + conversation.getContact().getJid().toBareJid());
953 Jid contactJid = conversation.getContact().getJid().toBareJid();
954 Set<AxolotlAddress> addresses = new HashSet<>();
955 if(deviceIds.get(contactJid) != null) {
956 for(Integer foreignId:this.deviceIds.get(contactJid)) {
957 AxolotlAddress address = new AxolotlAddress(contactJid.toString(), foreignId);
958 if(sessions.get(address) == null) {
959 IdentityKey identityKey = axolotlStore.loadSession(address).getSessionState().getRemoteIdentityKey();
960 if ( identityKey != null ) {
961 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account)+"Already have session for " + address.toString() + ", adding to cache...");
962 XmppAxolotlSession session = new XmppAxolotlSession(account, axolotlStore, address, identityKey.getFingerprint().replaceAll("\\s", ""));
963 sessions.put(address, session);
964 } else {
965 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Found device " + account.getJid().toBareJid() + ":" + foreignId);
966 addresses.add(new AxolotlAddress(contactJid.toString(), foreignId));
967 }
968 }
969 }
970 } else {
971 Log.w(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Have no target devices in PEP!");
972 }
973 if(deviceIds.get(account.getJid().toBareJid()) != null) {
974 for(Integer ownId:this.deviceIds.get(account.getJid().toBareJid())) {
975 AxolotlAddress address = new AxolotlAddress(account.getJid().toBareJid().toString(), ownId);
976 if(sessions.get(address) == null) {
977 IdentityKey identityKey = axolotlStore.loadSession(address).getSessionState().getRemoteIdentityKey();
978 if ( identityKey != null ) {
979 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account)+"Already have session for " + address.toString() + ", adding to cache...");
980 XmppAxolotlSession session = new XmppAxolotlSession(account, axolotlStore, address, identityKey.getFingerprint().replaceAll("\\s", ""));
981 sessions.put(address, session);
982 } else {
983 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Found device " + account.getJid().toBareJid() + ":" + ownId);
984 addresses.add(new AxolotlAddress(account.getJid().toBareJid().toString(), ownId));
985 }
986 }
987 }
988 }
989
990 return addresses;
991 }
992
993 public boolean createSessionsIfNeeded(final Conversation conversation, final boolean flushWaitingQueueAfterFetch) {
994 Log.i(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Creating axolotl sessions if needed...");
995 boolean newSessions = false;
996 Set<AxolotlAddress> addresses = findDevicesWithoutSession(conversation);
997 for (AxolotlAddress address : addresses) {
998 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Processing device: " + address.toString());
999 FetchStatus status = fetchStatusMap.get(address);
1000 if ( status == null || status == FetchStatus.ERROR ) {
1001 fetchStatusMap.put(address, FetchStatus.PENDING);
1002 this.buildSessionFromPEP(conversation, address, flushWaitingQueueAfterFetch);
1003 newSessions = true;
1004 } else {
1005 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account)+"Already fetching bundle for " + address.toString());
1006 }
1007 }
1008
1009 return newSessions;
1010 }
1011
1012 public boolean hasPendingKeyFetches(Conversation conversation) {
1013 AxolotlAddress ownAddress = new AxolotlAddress(account.getJid().toBareJid().toString(),0);
1014 AxolotlAddress foreignAddress = new AxolotlAddress(conversation.getJid().toBareJid().toString(),0);
1015 return fetchStatusMap.getAll(ownAddress).containsValue(FetchStatus.PENDING)
1016 ||fetchStatusMap.getAll(foreignAddress).containsValue(FetchStatus.PENDING);
1017
1018 }
1019
1020 @Nullable
1021 public XmppAxolotlMessage encrypt(Message message ){
1022 final String content;
1023 if (message.hasFileOnRemoteHost()) {
1024 content = message.getFileParams().url.toString();
1025 } else {
1026 content = message.getBody();
1027 }
1028 final XmppAxolotlMessage axolotlMessage = new XmppAxolotlMessage(message.getContact().getJid().toBareJid(),
1029 getOwnDeviceId(), content);
1030
1031 if(findSessionsforContact(message.getContact()).isEmpty()) {
1032 return null;
1033 }
1034 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account)+"Building axolotl foreign headers...");
1035 for (XmppAxolotlSession session : findSessionsforContact(message.getContact())) {
1036 Log.v(Config.LOGTAG, AxolotlService.getLogprefix(account)+session.remoteAddress.toString());
1037 //if(!session.isTrusted()) {
1038 // TODO: handle this properly
1039 // continue;
1040 // }
1041 axolotlMessage.addHeader(session.processSending(axolotlMessage.getInnerKey()));
1042 }
1043 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account)+"Building axolotl own headers...");
1044 for (XmppAxolotlSession session : findOwnSessions()) {
1045 Log.v(Config.LOGTAG, AxolotlService.getLogprefix(account)+session.remoteAddress.toString());
1046 // if(!session.isTrusted()) {
1047 // TODO: handle this properly
1048 // continue;
1049 // }
1050 axolotlMessage.addHeader(session.processSending(axolotlMessage.getInnerKey()));
1051 }
1052
1053 return axolotlMessage;
1054 }
1055
1056 private void processSending(final Message message, final boolean delay) {
1057 executor.execute(new Runnable() {
1058 @Override
1059 public void run() {
1060 MessagePacket packet = mXmppConnectionService.getMessageGenerator()
1061 .generateAxolotlChat(message);
1062 if (packet == null) {
1063 mXmppConnectionService.markMessage(message, Message.STATUS_SEND_FAILED);
1064 //mXmppConnectionService.updateConversationUi();
1065 } else {
1066 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account)+"Generated message, caching: " + message.getUuid());
1067 messageCache.put(message.getUuid(), packet);
1068 mXmppConnectionService.resendMessage(message,delay);
1069 }
1070 }
1071 });
1072 }
1073
1074 public void prepareMessage(final Message message,final boolean delay) {
1075 if (!messageCache.containsKey(message.getUuid())) {
1076 boolean newSessions = createSessionsIfNeeded(message.getConversation(), true);
1077 if (!newSessions) {
1078 this.processSending(message,delay);
1079 }
1080 }
1081 }
1082
1083 public MessagePacket fetchPacketFromCache(Message message) {
1084 MessagePacket packet = messageCache.get(message.getUuid());
1085 if (packet != null) {
1086 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account)+"Cache hit: " + message.getUuid());
1087 messageCache.remove(message.getUuid());
1088 } else {
1089 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account)+"Cache miss: " + message.getUuid());
1090 }
1091 return packet;
1092 }
1093
1094 public XmppAxolotlMessage.XmppAxolotlPlaintextMessage processReceiving(XmppAxolotlMessage message) {
1095 XmppAxolotlMessage.XmppAxolotlPlaintextMessage plaintextMessage = null;
1096 AxolotlAddress senderAddress = new AxolotlAddress(message.getFrom().toString(),
1097 message.getSenderDeviceId());
1098
1099 boolean newSession = false;
1100 XmppAxolotlSession session = sessions.get(senderAddress);
1101 if (session == null) {
1102 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account)+"Account: "+account.getJid()+" No axolotl session found while parsing received message " + message);
1103 // TODO: handle this properly
1104 IdentityKey identityKey = axolotlStore.loadSession(senderAddress).getSessionState().getRemoteIdentityKey();
1105 if ( identityKey != null ) {
1106 session = new XmppAxolotlSession(account, axolotlStore, senderAddress, identityKey.getFingerprint().replaceAll("\\s", ""));
1107 } else {
1108 session = new XmppAxolotlSession(account, axolotlStore, senderAddress);
1109 }
1110 newSession = true;
1111 }
1112
1113 for (XmppAxolotlMessage.XmppAxolotlMessageHeader header : message.getHeaders()) {
1114 if (header.getRecipientDeviceId() == getOwnDeviceId()) {
1115 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account)+"Found axolotl header matching own device ID, processing...");
1116 byte[] payloadKey = session.processReceiving(header);
1117 if (payloadKey != null) {
1118 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account)+"Got payload key from axolotl header. Decrypting message...");
1119 plaintextMessage = message.decrypt(session, payloadKey, session.getFingerprint());
1120 }
1121 Integer preKeyId = session.getPreKeyId();
1122 if (preKeyId != null) {
1123 publishBundlesIfNeeded();
1124 session.resetPreKeyId();
1125 }
1126 break;
1127 }
1128 }
1129
1130 if (newSession && plaintextMessage != null) {
1131 sessions.put(senderAddress, session);
1132 }
1133
1134 return plaintextMessage;
1135 }
1136}