1package eu.siacs.conversations.crypto.axolotl;
2
3import android.support.annotation.Nullable;
4import android.util.Base64;
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.ArrayList;
34import java.util.Arrays;
35import java.util.HashMap;
36import java.util.HashSet;
37import java.util.List;
38import java.util.Map;
39import java.util.Random;
40import java.util.Set;
41
42import eu.siacs.conversations.Config;
43import eu.siacs.conversations.entities.Account;
44import eu.siacs.conversations.entities.Contact;
45import eu.siacs.conversations.entities.Conversation;
46import eu.siacs.conversations.entities.Message;
47import eu.siacs.conversations.parser.IqParser;
48import eu.siacs.conversations.services.XmppConnectionService;
49import eu.siacs.conversations.utils.SerialSingleThreadExecutor;
50import eu.siacs.conversations.xml.Element;
51import eu.siacs.conversations.xmpp.OnIqPacketReceived;
52import eu.siacs.conversations.xmpp.jid.InvalidJidException;
53import eu.siacs.conversations.xmpp.jid.Jid;
54import eu.siacs.conversations.xmpp.stanzas.IqPacket;
55import eu.siacs.conversations.xmpp.stanzas.MessagePacket;
56
57public class AxolotlService {
58
59 public static final String PEP_PREFIX = "eu.siacs.conversations.axolotl";
60 public static final String PEP_DEVICE_LIST = PEP_PREFIX + ".devicelist";
61 public static final String PEP_BUNDLES = PEP_PREFIX + ".bundles";
62
63 public static final int NUM_KEYS_TO_PUBLISH = 10;
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 FetchStatusMap fetchStatusMap;
71 private final SerialSingleThreadExecutor executor;
72 private int ownDeviceId;
73
74 public static class SQLiteAxolotlStore implements AxolotlStore {
75
76 public static final String PREKEY_TABLENAME = "prekeys";
77 public static final String SIGNED_PREKEY_TABLENAME = "signed_prekeys";
78 public static final String SESSION_TABLENAME = "sessions";
79 public static final String IDENTITIES_TABLENAME = "identities";
80 public static final String ACCOUNT = "account";
81 public static final String DEVICE_ID = "device_id";
82 public static final String ID = "id";
83 public static final String KEY = "key";
84 public static final String NAME = "name";
85 public static final String TRUSTED = "trusted";
86 public static final String OWN = "ownkey";
87
88 public static final String JSONKEY_IDENTITY_KEY_PAIR = "axolotl_key";
89 public static final String JSONKEY_REGISTRATION_ID = "axolotl_reg_id";
90 public static final String JSONKEY_CURRENT_PREKEY_ID = "axolotl_cur_prekey_id";
91
92 private final Account account;
93 private final XmppConnectionService mXmppConnectionService;
94
95 private IdentityKeyPair identityKeyPair;
96 private final int localRegistrationId;
97 private int currentPreKeyId = 0;
98
99
100 private static IdentityKeyPair generateIdentityKeyPair() {
101 Log.d(Config.LOGTAG, "Generating axolotl IdentityKeyPair...");
102 ECKeyPair identityKeyPairKeys = Curve.generateKeyPair();
103 IdentityKeyPair ownKey = new IdentityKeyPair(new IdentityKey(identityKeyPairKeys.getPublicKey()),
104 identityKeyPairKeys.getPrivateKey());
105 return ownKey;
106 }
107
108 private static int generateRegistrationId() {
109 Log.d(Config.LOGTAG, "Generating axolotl registration ID...");
110 int reg_id = KeyHelper.generateRegistrationId(false);
111 return reg_id;
112 }
113
114 public SQLiteAxolotlStore(Account account, XmppConnectionService service) {
115 this.account = account;
116 this.mXmppConnectionService = service;
117 this.localRegistrationId = loadRegistrationId();
118 this.currentPreKeyId = loadCurrentPreKeyId();
119 for (SignedPreKeyRecord record : loadSignedPreKeys()) {
120 Log.d(Config.LOGTAG, "Got Axolotl signed prekey record:" + record.getId());
121 }
122 }
123
124 public int getCurrentPreKeyId() {
125 return currentPreKeyId;
126 }
127
128 // --------------------------------------
129 // IdentityKeyStore
130 // --------------------------------------
131
132 private IdentityKeyPair loadIdentityKeyPair() {
133 String ownName = account.getJid().toBareJid().toString();
134 IdentityKeyPair ownKey = mXmppConnectionService.databaseBackend.loadOwnIdentityKeyPair(account,
135 ownName);
136
137 if (ownKey != null) {
138 return ownKey;
139 } else {
140 Log.d(Config.LOGTAG, "Could not retrieve axolotl key for account " + ownName);
141 ownKey = generateIdentityKeyPair();
142 mXmppConnectionService.databaseBackend.storeOwnIdentityKeyPair(account, ownName, ownKey);
143 }
144 return ownKey;
145 }
146
147 private int loadRegistrationId() {
148 String regIdString = this.account.getKey(JSONKEY_REGISTRATION_ID);
149 int reg_id;
150 if (regIdString != null) {
151 reg_id = Integer.valueOf(regIdString);
152 } else {
153 Log.d(Config.LOGTAG, "Could not retrieve axolotl registration id for account " + account.getJid());
154 reg_id = generateRegistrationId();
155 boolean success = this.account.setKey(JSONKEY_REGISTRATION_ID, Integer.toString(reg_id));
156 if (success) {
157 mXmppConnectionService.databaseBackend.updateAccount(account);
158 } else {
159 Log.e(Config.LOGTAG, "Failed to write new key to the database!");
160 }
161 }
162 return reg_id;
163 }
164
165 private int loadCurrentPreKeyId() {
166 String regIdString = this.account.getKey(JSONKEY_CURRENT_PREKEY_ID);
167 int reg_id;
168 if (regIdString != null) {
169 reg_id = Integer.valueOf(regIdString);
170 } else {
171 Log.d(Config.LOGTAG, "Could not retrieve current prekey id for account " + account.getJid());
172 reg_id = 0;
173 }
174 return reg_id;
175 }
176
177
178 /**
179 * Get the local client's identity key pair.
180 *
181 * @return The local client's persistent identity key pair.
182 */
183 @Override
184 public IdentityKeyPair getIdentityKeyPair() {
185 if(identityKeyPair == null) {
186 identityKeyPair = loadIdentityKeyPair();
187 }
188 return identityKeyPair;
189 }
190
191 /**
192 * Return the local client's registration ID.
193 * <p/>
194 * Clients should maintain a registration ID, a random number
195 * between 1 and 16380 that's generated once at install time.
196 *
197 * @return the local client's registration ID.
198 */
199 @Override
200 public int getLocalRegistrationId() {
201 return localRegistrationId;
202 }
203
204 /**
205 * Save a remote client's identity key
206 * <p/>
207 * Store a remote client's identity key as trusted.
208 *
209 * @param name The name of the remote client.
210 * @param identityKey The remote client's identity key.
211 */
212 @Override
213 public void saveIdentity(String name, IdentityKey identityKey) {
214 if(!mXmppConnectionService.databaseBackend.loadIdentityKeys(account, name).contains(identityKey)) {
215 mXmppConnectionService.databaseBackend.storeIdentityKey(account, name, identityKey);
216 }
217 }
218
219 /**
220 * Verify a remote client's identity key.
221 * <p/>
222 * Determine whether a remote client's identity is trusted. Convention is
223 * that the TextSecure protocol is 'trust on first use.' This means that
224 * an identity key is considered 'trusted' if there is no entry for the recipient
225 * in the local store, or if it matches the saved key for a recipient in the local
226 * store. Only if it mismatches an entry in the local store is it considered
227 * 'untrusted.'
228 *
229 * @param name The name of the remote client.
230 * @param identityKey The identity key to verify.
231 * @return true if trusted, false if untrusted.
232 */
233 @Override
234 public boolean isTrustedIdentity(String name, IdentityKey identityKey) {
235 Set<IdentityKey> trustedKeys = mXmppConnectionService.databaseBackend.loadIdentityKeys(account, name);
236 return trustedKeys.isEmpty() || trustedKeys.contains(identityKey);
237 }
238
239 // --------------------------------------
240 // SessionStore
241 // --------------------------------------
242
243 /**
244 * Returns a copy of the {@link SessionRecord} corresponding to the recipientId + deviceId tuple,
245 * or a new SessionRecord if one does not currently exist.
246 * <p/>
247 * It is important that implementations return a copy of the current durable information. The
248 * returned SessionRecord may be modified, but those changes should not have an effect on the
249 * durable session state (what is returned by subsequent calls to this method) without the
250 * store method being called here first.
251 *
252 * @param address The name and device ID of the remote client.
253 * @return a copy of the SessionRecord corresponding to the recipientId + deviceId tuple, or
254 * a new SessionRecord if one does not currently exist.
255 */
256 @Override
257 public SessionRecord loadSession(AxolotlAddress address) {
258 SessionRecord session = mXmppConnectionService.databaseBackend.loadSession(this.account, address);
259 return (session != null) ? session : new SessionRecord();
260 }
261
262 /**
263 * Returns all known devices with active sessions for a recipient
264 *
265 * @param name the name of the client.
266 * @return all known sub-devices with active sessions.
267 */
268 @Override
269 public List<Integer> getSubDeviceSessions(String name) {
270 return mXmppConnectionService.databaseBackend.getSubDeviceSessions(account,
271 new AxolotlAddress(name, 0));
272 }
273
274 /**
275 * Commit to storage the {@link SessionRecord} for a given recipientId + deviceId tuple.
276 *
277 * @param address the address of the remote client.
278 * @param record the current SessionRecord for the remote client.
279 */
280 @Override
281 public void storeSession(AxolotlAddress address, SessionRecord record) {
282 mXmppConnectionService.databaseBackend.storeSession(account, address, record);
283 }
284
285 /**
286 * Determine whether there is a committed {@link SessionRecord} for a recipientId + deviceId tuple.
287 *
288 * @param address the address of the remote client.
289 * @return true if a {@link SessionRecord} exists, false otherwise.
290 */
291 @Override
292 public boolean containsSession(AxolotlAddress address) {
293 return mXmppConnectionService.databaseBackend.containsSession(account, address);
294 }
295
296 /**
297 * Remove a {@link SessionRecord} for a recipientId + deviceId tuple.
298 *
299 * @param address the address of the remote client.
300 */
301 @Override
302 public void deleteSession(AxolotlAddress address) {
303 mXmppConnectionService.databaseBackend.deleteSession(account, address);
304 }
305
306 /**
307 * Remove the {@link SessionRecord}s corresponding to all devices of a recipientId.
308 *
309 * @param name the name of the remote client.
310 */
311 @Override
312 public void deleteAllSessions(String name) {
313 mXmppConnectionService.databaseBackend.deleteAllSessions(account,
314 new AxolotlAddress(name, 0));
315 }
316
317 public boolean isTrustedSession(AxolotlAddress address) {
318 return mXmppConnectionService.databaseBackend.isTrustedSession(this.account, address);
319 }
320
321 public void setTrustedSession(AxolotlAddress address, boolean trusted) {
322 mXmppConnectionService.databaseBackend.setTrustedSession(this.account, address, trusted);
323 }
324
325 // --------------------------------------
326 // PreKeyStore
327 // --------------------------------------
328
329 /**
330 * Load a local PreKeyRecord.
331 *
332 * @param preKeyId the ID of the local PreKeyRecord.
333 * @return the corresponding PreKeyRecord.
334 * @throws InvalidKeyIdException when there is no corresponding PreKeyRecord.
335 */
336 @Override
337 public PreKeyRecord loadPreKey(int preKeyId) throws InvalidKeyIdException {
338 PreKeyRecord record = mXmppConnectionService.databaseBackend.loadPreKey(account, preKeyId);
339 if (record == null) {
340 throw new InvalidKeyIdException("No such PreKeyRecord: " + preKeyId);
341 }
342 return record;
343 }
344
345 /**
346 * Store a local PreKeyRecord.
347 *
348 * @param preKeyId the ID of the PreKeyRecord to store.
349 * @param record the PreKeyRecord.
350 */
351 @Override
352 public void storePreKey(int preKeyId, PreKeyRecord record) {
353 mXmppConnectionService.databaseBackend.storePreKey(account, record);
354 currentPreKeyId = preKeyId;
355 boolean success = this.account.setKey(JSONKEY_CURRENT_PREKEY_ID, Integer.toString(preKeyId));
356 if (success) {
357 mXmppConnectionService.databaseBackend.updateAccount(account);
358 } else {
359 Log.e(Config.LOGTAG, "Failed to write new prekey id to the database!");
360 }
361 }
362
363 /**
364 * @param preKeyId A PreKeyRecord ID.
365 * @return true if the store has a record for the preKeyId, otherwise false.
366 */
367 @Override
368 public boolean containsPreKey(int preKeyId) {
369 return mXmppConnectionService.databaseBackend.containsPreKey(account, preKeyId);
370 }
371
372 /**
373 * Delete a PreKeyRecord from local storage.
374 *
375 * @param preKeyId The ID of the PreKeyRecord to remove.
376 */
377 @Override
378 public void removePreKey(int preKeyId) {
379 mXmppConnectionService.databaseBackend.deletePreKey(account, preKeyId);
380 }
381
382 // --------------------------------------
383 // SignedPreKeyStore
384 // --------------------------------------
385
386 /**
387 * Load a local SignedPreKeyRecord.
388 *
389 * @param signedPreKeyId the ID of the local SignedPreKeyRecord.
390 * @return the corresponding SignedPreKeyRecord.
391 * @throws InvalidKeyIdException when there is no corresponding SignedPreKeyRecord.
392 */
393 @Override
394 public SignedPreKeyRecord loadSignedPreKey(int signedPreKeyId) throws InvalidKeyIdException {
395 SignedPreKeyRecord record = mXmppConnectionService.databaseBackend.loadSignedPreKey(account, signedPreKeyId);
396 if (record == null) {
397 throw new InvalidKeyIdException("No such SignedPreKeyRecord: " + signedPreKeyId);
398 }
399 return record;
400 }
401
402 /**
403 * Load all local SignedPreKeyRecords.
404 *
405 * @return All stored SignedPreKeyRecords.
406 */
407 @Override
408 public List<SignedPreKeyRecord> loadSignedPreKeys() {
409 return mXmppConnectionService.databaseBackend.loadSignedPreKeys(account);
410 }
411
412 /**
413 * Store a local SignedPreKeyRecord.
414 *
415 * @param signedPreKeyId the ID of the SignedPreKeyRecord to store.
416 * @param record the SignedPreKeyRecord.
417 */
418 @Override
419 public void storeSignedPreKey(int signedPreKeyId, SignedPreKeyRecord record) {
420 mXmppConnectionService.databaseBackend.storeSignedPreKey(account, record);
421 }
422
423 /**
424 * @param signedPreKeyId A SignedPreKeyRecord ID.
425 * @return true if the store has a record for the signedPreKeyId, otherwise false.
426 */
427 @Override
428 public boolean containsSignedPreKey(int signedPreKeyId) {
429 return mXmppConnectionService.databaseBackend.containsSignedPreKey(account, signedPreKeyId);
430 }
431
432 /**
433 * Delete a SignedPreKeyRecord from local storage.
434 *
435 * @param signedPreKeyId The ID of the SignedPreKeyRecord to remove.
436 */
437 @Override
438 public void removeSignedPreKey(int signedPreKeyId) {
439 mXmppConnectionService.databaseBackend.deleteSignedPreKey(account, signedPreKeyId);
440 }
441 }
442
443 public static class XmppAxolotlSession {
444 private SessionCipher cipher;
445 private boolean isTrusted = false;
446 private SQLiteAxolotlStore sqLiteAxolotlStore;
447 private AxolotlAddress remoteAddress;
448
449 public XmppAxolotlSession(SQLiteAxolotlStore store, AxolotlAddress remoteAddress) {
450 this.cipher = new SessionCipher(store, remoteAddress);
451 this.remoteAddress = remoteAddress;
452 this.sqLiteAxolotlStore = store;
453 this.isTrusted = sqLiteAxolotlStore.isTrustedSession(remoteAddress);
454 }
455
456 public void trust() {
457 sqLiteAxolotlStore.setTrustedSession(remoteAddress, true);
458 this.isTrusted = true;
459 }
460
461 public boolean isTrusted() {
462 return this.isTrusted;
463 }
464
465 public byte[] processReceiving(XmppAxolotlMessage.XmppAxolotlMessageHeader incomingHeader) {
466 byte[] plaintext = null;
467 try {
468 try {
469 PreKeyWhisperMessage message = new PreKeyWhisperMessage(incomingHeader.getContents());
470 Log.d(Config.LOGTAG, "PreKeyWhisperMessage ID:" + message.getSignedPreKeyId() + "/" + message.getPreKeyId());
471 plaintext = cipher.decrypt(message);
472 } catch (InvalidMessageException | InvalidVersionException e) {
473 WhisperMessage message = new WhisperMessage(incomingHeader.getContents());
474 plaintext = cipher.decrypt(message);
475 } catch (InvalidKeyException | InvalidKeyIdException | UntrustedIdentityException e) {
476 Log.d(Config.LOGTAG, "Error decrypting axolotl header, "+e.getClass().getName()+": " + e.getMessage());
477 }
478 } catch (LegacyMessageException | InvalidMessageException e) {
479 Log.d(Config.LOGTAG, "Error decrypting axolotl header, "+e.getClass().getName()+": " + e.getMessage());
480 } catch (DuplicateMessageException | NoSessionException e) {
481 Log.d(Config.LOGTAG, "Error decrypting axolotl header, "+e.getClass().getName()+": " + e.getMessage());
482 }
483 return plaintext;
484 }
485
486 public XmppAxolotlMessage.XmppAxolotlMessageHeader processSending(byte[] outgoingMessage) {
487 CiphertextMessage ciphertextMessage = cipher.encrypt(outgoingMessage);
488 XmppAxolotlMessage.XmppAxolotlMessageHeader header =
489 new XmppAxolotlMessage.XmppAxolotlMessageHeader(remoteAddress.getDeviceId(),
490 ciphertextMessage.serialize());
491 return header;
492 }
493 }
494
495 private static class AxolotlAddressMap<T> {
496 protected Map<String, Map<Integer, T>> map;
497 protected final Object MAP_LOCK = new Object();
498
499 public AxolotlAddressMap() {
500 this.map = new HashMap<>();
501 }
502
503 public void put(AxolotlAddress address, T value) {
504 synchronized (MAP_LOCK) {
505 Map<Integer, T> devices = map.get(address.getName());
506 if (devices == null) {
507 devices = new HashMap<>();
508 map.put(address.getName(), devices);
509 }
510 devices.put(address.getDeviceId(), value);
511 }
512 }
513
514 public T get(AxolotlAddress address) {
515 synchronized (MAP_LOCK) {
516 Map<Integer, T> devices = map.get(address.getName());
517 if (devices == null) {
518 return null;
519 }
520 return devices.get(address.getDeviceId());
521 }
522 }
523
524 public Map<Integer, T> getAll(AxolotlAddress address) {
525 synchronized (MAP_LOCK) {
526 Map<Integer, T> devices = map.get(address.getName());
527 if (devices == null) {
528 return new HashMap<>();
529 }
530 return devices;
531 }
532 }
533
534 public boolean hasAny(AxolotlAddress address) {
535 synchronized (MAP_LOCK) {
536 Map<Integer, T> devices = map.get(address.getName());
537 return devices != null && !devices.isEmpty();
538 }
539 }
540
541
542 }
543
544 private static class SessionMap extends AxolotlAddressMap<XmppAxolotlSession> {
545
546 public SessionMap(SQLiteAxolotlStore store, Account account) {
547 super();
548 this.fillMap(store, account);
549 }
550
551 private void fillMap(SQLiteAxolotlStore store, Account account) {
552 for (Contact contact : account.getRoster().getContacts()) {
553 Jid bareJid = contact.getJid().toBareJid();
554 if (bareJid == null) {
555 continue; // FIXME: handle this?
556 }
557 String address = bareJid.toString();
558 List<Integer> deviceIDs = store.getSubDeviceSessions(address);
559 for (Integer deviceId : deviceIDs) {
560 AxolotlAddress axolotlAddress = new AxolotlAddress(address, deviceId);
561 this.put(axolotlAddress, new XmppAxolotlSession(store, axolotlAddress));
562 }
563 }
564 }
565
566 }
567
568 private static enum FetchStatus {
569 PENDING,
570 SUCCESS,
571 ERROR
572 }
573
574 private static class FetchStatusMap extends AxolotlAddressMap<FetchStatus> {
575
576 }
577
578 public AxolotlService(Account account, XmppConnectionService connectionService) {
579 this.mXmppConnectionService = connectionService;
580 this.account = account;
581 this.axolotlStore = new SQLiteAxolotlStore(this.account, this.mXmppConnectionService);
582 this.deviceIds = new HashMap<>();
583 this.sessions = new SessionMap(axolotlStore, account);
584 this.fetchStatusMap = new FetchStatusMap();
585 this.executor = new SerialSingleThreadExecutor();
586 this.ownDeviceId = axolotlStore.getLocalRegistrationId();
587 }
588
589 public void trustSession(AxolotlAddress counterpart) {
590 XmppAxolotlSession session = sessions.get(counterpart);
591 if (session != null) {
592 session.trust();
593 }
594 }
595
596 public boolean isTrustedSession(AxolotlAddress counterpart) {
597 XmppAxolotlSession session = sessions.get(counterpart);
598 return session != null && session.isTrusted();
599 }
600
601 private AxolotlAddress getAddressForJid(Jid jid) {
602 return new AxolotlAddress(jid.toString(), 0);
603 }
604
605 private Set<XmppAxolotlSession> findOwnSessions() {
606 AxolotlAddress ownAddress = getAddressForJid(account.getJid().toBareJid());
607 Set<XmppAxolotlSession> ownDeviceSessions = new HashSet<>(this.sessions.getAll(ownAddress).values());
608 return ownDeviceSessions;
609 }
610
611 private Set<XmppAxolotlSession> findSessionsforContact(Contact contact) {
612 AxolotlAddress contactAddress = getAddressForJid(contact.getJid());
613 Set<XmppAxolotlSession> sessions = new HashSet<>(this.sessions.getAll(contactAddress).values());
614 return sessions;
615 }
616
617 private boolean hasAny(Contact contact) {
618 AxolotlAddress contactAddress = getAddressForJid(contact.getJid());
619 return sessions.hasAny(contactAddress);
620 }
621
622 public int getOwnDeviceId() {
623 return ownDeviceId;
624 }
625
626 public void registerDevices(final Jid jid, final Set<Integer> deviceIds) {
627 for(Integer i:deviceIds) {
628 Log.d(Config.LOGTAG, "Adding Device ID:"+ jid + ":"+i);
629 }
630 this.deviceIds.put(jid, deviceIds);
631 }
632
633 public void publishOwnDeviceIdIfNeeded() {
634 IqPacket packet = mXmppConnectionService.getIqGenerator().retrieveDeviceIds(account.getJid().toBareJid());
635 mXmppConnectionService.sendIqPacket(account, packet, new OnIqPacketReceived() {
636 @Override
637 public void onIqPacketReceived(Account account, IqPacket packet) {
638 Element item = mXmppConnectionService.getIqParser().getItem(packet);
639 Set<Integer> deviceIds = mXmppConnectionService.getIqParser().deviceIds(item);
640 if (deviceIds == null) {
641 deviceIds = new HashSet<Integer>();
642 }
643 if (!deviceIds.contains(getOwnDeviceId())) {
644 deviceIds.add(getOwnDeviceId());
645 IqPacket publish = mXmppConnectionService.getIqGenerator().publishDeviceIds(deviceIds);
646 Log.d(Config.LOGTAG, "Own device " + getOwnDeviceId() + " not in PEP devicelist. Publishing: " + publish);
647 mXmppConnectionService.sendIqPacket(account, publish, new OnIqPacketReceived() {
648 @Override
649 public void onIqPacketReceived(Account account, IqPacket packet) {
650 // TODO: implement this!
651 }
652 });
653 }
654 }
655 });
656 }
657
658 private boolean validateBundle(PreKeyBundle bundle) {
659 if (bundle == null || bundle.getIdentityKey() == null
660 || bundle.getSignedPreKey() == null || bundle.getSignedPreKeySignature() == null) {
661 return false;
662 }
663
664 try {
665 SignedPreKeyRecord signedPreKeyRecord = axolotlStore.loadSignedPreKey(bundle.getSignedPreKeyId());
666 IdentityKey identityKey = axolotlStore.getIdentityKeyPair().getPublicKey();
667 Log.d(Config.LOGTAG,"own identity key:"+identityKey.getFingerprint()+", foreign: "+bundle.getIdentityKey().getFingerprint());
668 Log.d(Config.LOGTAG,"bundle: "+Boolean.toString(bundle.getSignedPreKey().equals(signedPreKeyRecord.getKeyPair().getPublicKey()))
669 +" " + Boolean.toString(Arrays.equals(bundle.getSignedPreKeySignature(), signedPreKeyRecord.getSignature()))
670 +" " + Boolean.toString( bundle.getIdentityKey().equals(identityKey)));
671 return bundle.getSignedPreKey().equals(signedPreKeyRecord.getKeyPair().getPublicKey())
672 && Arrays.equals(bundle.getSignedPreKeySignature(), signedPreKeyRecord.getSignature())
673 && bundle.getIdentityKey().equals(identityKey);
674 } catch (InvalidKeyIdException ignored) {
675 return false;
676 }
677 }
678
679 private boolean validatePreKeys(Map<Integer, ECPublicKey> keys) {
680 if(keys == null) { return false; }
681 for(Integer id:keys.keySet()) {
682 try {
683 PreKeyRecord preKeyRecord = axolotlStore.loadPreKey(id);
684 if(!preKeyRecord.getKeyPair().getPublicKey().equals(keys.get(id))) {
685 return false;
686 }
687 } catch (InvalidKeyIdException ignored) {
688 return false;
689 }
690 }
691 return true;
692 }
693
694 public void publishBundlesIfNeeded() {
695 IqPacket packet = mXmppConnectionService.getIqGenerator().retrieveBundlesForDevice(account.getJid().toBareJid(), ownDeviceId);
696 mXmppConnectionService.sendIqPacket(account, packet, new OnIqPacketReceived() {
697 @Override
698 public void onIqPacketReceived(Account account, IqPacket packet) {
699 PreKeyBundle bundle = mXmppConnectionService.getIqParser().bundle(packet);
700 Map<Integer, ECPublicKey> keys = mXmppConnectionService.getIqParser().preKeyPublics(packet);
701 SignedPreKeyRecord signedPreKeyRecord;
702 List<PreKeyRecord> preKeyRecords;
703 if (!validateBundle(bundle) || keys.isEmpty() || !validatePreKeys(keys)) {
704 int numSignedPreKeys = axolotlStore.loadSignedPreKeys().size();
705 try {
706 signedPreKeyRecord = KeyHelper.generateSignedPreKey(
707 axolotlStore.getIdentityKeyPair(), numSignedPreKeys + 1);
708 axolotlStore.storeSignedPreKey(signedPreKeyRecord.getId(), signedPreKeyRecord);
709
710 preKeyRecords = KeyHelper.generatePreKeys(
711 axolotlStore.getCurrentPreKeyId(), NUM_KEYS_TO_PUBLISH);
712 for (PreKeyRecord record : preKeyRecords) {
713 axolotlStore.storePreKey(record.getId(), record);
714 }
715
716 IqPacket publish = mXmppConnectionService.getIqGenerator().publishBundles(
717 signedPreKeyRecord, axolotlStore.getIdentityKeyPair().getPublicKey(),
718 preKeyRecords, ownDeviceId);
719 Log.d(Config.LOGTAG, "Bundle " + getOwnDeviceId() + " not in PEP. Publishing: " + publish);
720 mXmppConnectionService.sendIqPacket(account, publish, new OnIqPacketReceived() {
721 @Override
722 public void onIqPacketReceived(Account account, IqPacket packet) {
723 // TODO: implement this!
724 Log.d(Config.LOGTAG, "Published bundle, got: " + packet);
725 }
726 });
727 } catch (InvalidKeyException e) {
728 Log.e(Config.LOGTAG, "Failed to publish bundle " + getOwnDeviceId() + ", reason: " + e.getMessage());
729 return;
730 }
731 }
732 }
733 });
734 }
735
736 public boolean isContactAxolotlCapable(Contact contact) {
737 Jid jid = contact.getJid().toBareJid();
738 AxolotlAddress address = new AxolotlAddress(jid.toString(), 0);
739 return sessions.hasAny(address) ||
740 ( deviceIds.containsKey(jid) && !deviceIds.get(jid).isEmpty());
741 }
742
743 private void buildSessionFromPEP(final Conversation conversation, final AxolotlAddress address) {
744 Log.d(Config.LOGTAG, "Building new sesstion for " + address.getDeviceId());
745
746 try {
747 IqPacket bundlesPacket = mXmppConnectionService.getIqGenerator().retrieveBundlesForDevice(
748 Jid.fromString(address.getName()), address.getDeviceId());
749 Log.d(Config.LOGTAG, "Retrieving bundle: " + bundlesPacket);
750 mXmppConnectionService.sendIqPacket(account, bundlesPacket, new OnIqPacketReceived() {
751 @Override
752 public void onIqPacketReceived(Account account, IqPacket packet) {
753 Log.d(Config.LOGTAG, "Received preKey IQ packet, processing...");
754 final IqParser parser = mXmppConnectionService.getIqParser();
755 final List<PreKeyBundle> preKeyBundleList = parser.preKeys(packet);
756 final PreKeyBundle bundle = parser.bundle(packet);
757 if (preKeyBundleList.isEmpty() || bundle == null) {
758 Log.d(Config.LOGTAG, "preKey IQ packet invalid: " + packet);
759 fetchStatusMap.put(address, FetchStatus.ERROR);
760 return;
761 }
762 Random random = new Random();
763 final PreKeyBundle preKey = preKeyBundleList.get(random.nextInt(preKeyBundleList.size()));
764 if (preKey == null) {
765 //should never happen
766 fetchStatusMap.put(address, FetchStatus.ERROR);
767 return;
768 }
769
770 final PreKeyBundle preKeyBundle = new PreKeyBundle(0, address.getDeviceId(),
771 preKey.getPreKeyId(), preKey.getPreKey(),
772 bundle.getSignedPreKeyId(), bundle.getSignedPreKey(),
773 bundle.getSignedPreKeySignature(), bundle.getIdentityKey());
774
775 axolotlStore.saveIdentity(address.getName(), bundle.getIdentityKey());
776
777 try {
778 SessionBuilder builder = new SessionBuilder(axolotlStore, address);
779 builder.process(preKeyBundle);
780 XmppAxolotlSession session = new XmppAxolotlSession(axolotlStore, address);
781 sessions.put(address, session);
782 fetchStatusMap.put(address, FetchStatus.SUCCESS);
783 } catch (UntrustedIdentityException|InvalidKeyException e) {
784 Log.d(Config.LOGTAG, "Error building session for " + address + ": "
785 + e.getClass().getName() + ", " + e.getMessage());
786 fetchStatusMap.put(address, FetchStatus.ERROR);
787 }
788
789 AxolotlAddress ownAddress = new AxolotlAddress(conversation.getAccount().getJid().toBareJid().toString(),0);
790 AxolotlAddress foreignAddress = new AxolotlAddress(conversation.getJid().toBareJid().toString(),0);
791 if (!fetchStatusMap.getAll(ownAddress).containsValue(FetchStatus.PENDING)
792 && !fetchStatusMap.getAll(foreignAddress).containsValue(FetchStatus.PENDING)) {
793 conversation.findUnsentMessagesWithEncryption(Message.ENCRYPTION_AXOLOTL,
794 new Conversation.OnMessageFound() {
795 @Override
796 public void onMessageFound(Message message) {
797 processSending(message);
798 }
799 });
800 }
801 }
802 });
803 } catch (InvalidJidException e) {
804 Log.e(Config.LOGTAG,"Got address with invalid jid: " + address.getName());
805 }
806 }
807
808 private boolean createSessionsIfNeeded(Conversation conversation) {
809 boolean newSessions = false;
810 Log.d(Config.LOGTAG, "Creating axolotl sessions if needed...");
811 Jid contactJid = conversation.getContact().getJid().toBareJid();
812 Set<AxolotlAddress> addresses = new HashSet<>();
813 if(deviceIds.get(contactJid) != null) {
814 for(Integer foreignId:this.deviceIds.get(contactJid)) {
815 Log.d(Config.LOGTAG, "Found device "+account.getJid().toBareJid()+":"+foreignId);
816 addresses.add(new AxolotlAddress(contactJid.toString(), foreignId));
817 }
818 } else {
819 Log.e(Config.LOGTAG, "Have no target devices in PEP!");
820 }
821 Log.d(Config.LOGTAG, "Checking own account "+account.getJid().toBareJid());
822 if(deviceIds.get(account.getJid().toBareJid()) != null) {
823 for(Integer ownId:this.deviceIds.get(account.getJid().toBareJid())) {
824 Log.d(Config.LOGTAG, "Found device "+account.getJid().toBareJid()+":"+ownId);
825 addresses.add(new AxolotlAddress(account.getJid().toBareJid().toString(), ownId));
826 }
827 }
828 for (AxolotlAddress address : addresses) {
829 Log.d(Config.LOGTAG, "Processing device: " + address.toString());
830 FetchStatus status = fetchStatusMap.get(address);
831 XmppAxolotlSession session = sessions.get(address);
832 if ( session == null && ( status == null || status == FetchStatus.ERROR) ) {
833 fetchStatusMap.put(address, FetchStatus.PENDING);
834 this.buildSessionFromPEP(conversation, address);
835 newSessions = true;
836 } else {
837 Log.d(Config.LOGTAG, "Already have session for " + address.toString());
838 }
839 }
840 return newSessions;
841 }
842
843 @Nullable
844 public XmppAxolotlMessage encrypt(Message message ){
845 final XmppAxolotlMessage axolotlMessage = new XmppAxolotlMessage(message.getContact(),
846 ownDeviceId, message.getBody());
847
848 if(findSessionsforContact(axolotlMessage.getContact()).isEmpty()) {
849 return null;
850 }
851 Log.d(Config.LOGTAG, "Building axolotl foreign headers...");
852 for (XmppAxolotlSession session : findSessionsforContact(axolotlMessage.getContact())) {
853 Log.d(Config.LOGTAG, session.remoteAddress.toString());
854 //if(!session.isTrusted()) {
855 // TODO: handle this properly
856 // continue;
857 // }
858 axolotlMessage.addHeader(session.processSending(axolotlMessage.getInnerKey()));
859 }
860 Log.d(Config.LOGTAG, "Building axolotl own headers...");
861 for (XmppAxolotlSession session : findOwnSessions()) {
862 Log.d(Config.LOGTAG, session.remoteAddress.toString());
863 // if(!session.isTrusted()) {
864 // TODO: handle this properly
865 // continue;
866 // }
867 axolotlMessage.addHeader(session.processSending(axolotlMessage.getInnerKey()));
868 }
869
870 return axolotlMessage;
871 }
872
873 private void processSending(final Message message) {
874 executor.execute(new Runnable() {
875 @Override
876 public void run() {
877 MessagePacket packet = mXmppConnectionService.getMessageGenerator()
878 .generateAxolotlChat(message);
879 if (packet == null) {
880 mXmppConnectionService.markMessage(message, Message.STATUS_SEND_FAILED);
881 } else {
882 mXmppConnectionService.markMessage(message, Message.STATUS_UNSEND);
883 mXmppConnectionService.sendMessagePacket(account, packet);
884 }
885 }
886 });
887 }
888
889 public void sendMessage(Message message) {
890 boolean newSessions = createSessionsIfNeeded(message.getConversation());
891
892 if (!newSessions) {
893 this.processSending(message);
894 }
895 }
896
897 public XmppAxolotlMessage.XmppAxolotlPlaintextMessage processReceiving(XmppAxolotlMessage message) {
898 XmppAxolotlMessage.XmppAxolotlPlaintextMessage plaintextMessage = null;
899 AxolotlAddress senderAddress = new AxolotlAddress(message.getContact().getJid().toBareJid().toString(),
900 message.getSenderDeviceId());
901
902 XmppAxolotlSession session = sessions.get(senderAddress);
903 if (session == null) {
904 Log.d(Config.LOGTAG, "Account: "+account.getJid()+" No axolotl session found while parsing received message " + message);
905 // TODO: handle this properly
906 session = new XmppAxolotlSession(axolotlStore, senderAddress);
907 sessions.put(senderAddress,session);
908 }
909
910 for (XmppAxolotlMessage.XmppAxolotlMessageHeader header : message.getHeaders()) {
911 if (header.getRecipientDeviceId() == ownDeviceId) {
912 Log.d(Config.LOGTAG, "Found axolotl header matching own device ID, processing...");
913 byte[] payloadKey = session.processReceiving(header);
914 if (payloadKey != null) {
915 Log.d(Config.LOGTAG, "Got payload key from axolotl header. Decrypting message...");
916 plaintextMessage = message.decrypt(session, payloadKey);
917 }
918 }
919 }
920
921 return plaintextMessage;
922 }
923}