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 Map<String, MessagePacket> messageCache;
71 private final FetchStatusMap fetchStatusMap;
72 private final SerialSingleThreadExecutor executor;
73 private int ownDeviceId;
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 NAME = "name";
86 public static final String TRUSTED = "trusted";
87 public static final String OWN = "ownkey";
88
89 public static final String JSONKEY_IDENTITY_KEY_PAIR = "axolotl_key";
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 final int localRegistrationId;
98 private int currentPreKeyId = 0;
99
100
101 private static IdentityKeyPair generateIdentityKeyPair() {
102 Log.d(Config.LOGTAG, "Generating axolotl IdentityKeyPair...");
103 ECKeyPair identityKeyPairKeys = Curve.generateKeyPair();
104 IdentityKeyPair ownKey = new IdentityKeyPair(new IdentityKey(identityKeyPairKeys.getPublicKey()),
105 identityKeyPairKeys.getPrivateKey());
106 return ownKey;
107 }
108
109 private static int generateRegistrationId() {
110 Log.d(Config.LOGTAG, "Generating axolotl registration ID...");
111 int reg_id = KeyHelper.generateRegistrationId(false);
112 return reg_id;
113 }
114
115 public SQLiteAxolotlStore(Account account, XmppConnectionService service) {
116 this.account = account;
117 this.mXmppConnectionService = service;
118 this.localRegistrationId = loadRegistrationId();
119 this.currentPreKeyId = loadCurrentPreKeyId();
120 for (SignedPreKeyRecord record : loadSignedPreKeys()) {
121 Log.d(Config.LOGTAG, "Got Axolotl signed prekey record:" + record.getId());
122 }
123 }
124
125 public int getCurrentPreKeyId() {
126 return currentPreKeyId;
127 }
128
129 // --------------------------------------
130 // IdentityKeyStore
131 // --------------------------------------
132
133 private IdentityKeyPair loadIdentityKeyPair() {
134 String ownName = account.getJid().toBareJid().toString();
135 IdentityKeyPair ownKey = mXmppConnectionService.databaseBackend.loadOwnIdentityKeyPair(account,
136 ownName);
137
138 if (ownKey != null) {
139 return ownKey;
140 } else {
141 Log.d(Config.LOGTAG, "Could not retrieve axolotl key for account " + ownName);
142 ownKey = generateIdentityKeyPair();
143 mXmppConnectionService.databaseBackend.storeOwnIdentityKeyPair(account, ownName, ownKey);
144 }
145 return ownKey;
146 }
147
148 private int loadRegistrationId() {
149 String regIdString = this.account.getKey(JSONKEY_REGISTRATION_ID);
150 int reg_id;
151 if (regIdString != null) {
152 reg_id = Integer.valueOf(regIdString);
153 } else {
154 Log.d(Config.LOGTAG, "Could not retrieve axolotl registration id for account " + account.getJid());
155 reg_id = generateRegistrationId();
156 boolean success = this.account.setKey(JSONKEY_REGISTRATION_ID, Integer.toString(reg_id));
157 if (success) {
158 mXmppConnectionService.databaseBackend.updateAccount(account);
159 } else {
160 Log.e(Config.LOGTAG, "Failed to write new key to the database!");
161 }
162 }
163 return reg_id;
164 }
165
166 private int loadCurrentPreKeyId() {
167 String regIdString = this.account.getKey(JSONKEY_CURRENT_PREKEY_ID);
168 int reg_id;
169 if (regIdString != null) {
170 reg_id = Integer.valueOf(regIdString);
171 } else {
172 Log.d(Config.LOGTAG, "Could not retrieve current prekey id for account " + account.getJid());
173 reg_id = 0;
174 }
175 return reg_id;
176 }
177
178
179 /**
180 * Get the local client's identity key pair.
181 *
182 * @return The local client's persistent identity key pair.
183 */
184 @Override
185 public IdentityKeyPair getIdentityKeyPair() {
186 if(identityKeyPair == null) {
187 identityKeyPair = loadIdentityKeyPair();
188 }
189 return identityKeyPair;
190 }
191
192 /**
193 * Return the local client's registration ID.
194 * <p/>
195 * Clients should maintain a registration ID, a random number
196 * between 1 and 16380 that's generated once at install time.
197 *
198 * @return the local client's registration ID.
199 */
200 @Override
201 public int getLocalRegistrationId() {
202 return localRegistrationId;
203 }
204
205 /**
206 * Save a remote client's identity key
207 * <p/>
208 * Store a remote client's identity key as trusted.
209 *
210 * @param name The name of the remote client.
211 * @param identityKey The remote client's identity key.
212 */
213 @Override
214 public void saveIdentity(String name, IdentityKey identityKey) {
215 if(!mXmppConnectionService.databaseBackend.loadIdentityKeys(account, name).contains(identityKey)) {
216 mXmppConnectionService.databaseBackend.storeIdentityKey(account, name, identityKey);
217 }
218 }
219
220 /**
221 * Verify a remote client's identity key.
222 * <p/>
223 * Determine whether a remote client's identity is trusted. Convention is
224 * that the TextSecure protocol is 'trust on first use.' This means that
225 * an identity key is considered 'trusted' if there is no entry for the recipient
226 * in the local store, or if it matches the saved key for a recipient in the local
227 * store. Only if it mismatches an entry in the local store is it considered
228 * 'untrusted.'
229 *
230 * @param name The name of the remote client.
231 * @param identityKey The identity key to verify.
232 * @return true if trusted, false if untrusted.
233 */
234 @Override
235 public boolean isTrustedIdentity(String name, IdentityKey identityKey) {
236 Set<IdentityKey> trustedKeys = mXmppConnectionService.databaseBackend.loadIdentityKeys(account, name);
237 return trustedKeys.isEmpty() || trustedKeys.contains(identityKey);
238 }
239
240 // --------------------------------------
241 // SessionStore
242 // --------------------------------------
243
244 /**
245 * Returns a copy of the {@link SessionRecord} corresponding to the recipientId + deviceId tuple,
246 * or a new SessionRecord if one does not currently exist.
247 * <p/>
248 * It is important that implementations return a copy of the current durable information. The
249 * returned SessionRecord may be modified, but those changes should not have an effect on the
250 * durable session state (what is returned by subsequent calls to this method) without the
251 * store method being called here first.
252 *
253 * @param address The name and device ID of the remote client.
254 * @return a copy of the SessionRecord corresponding to the recipientId + deviceId tuple, or
255 * a new SessionRecord if one does not currently exist.
256 */
257 @Override
258 public SessionRecord loadSession(AxolotlAddress address) {
259 SessionRecord session = mXmppConnectionService.databaseBackend.loadSession(this.account, address);
260 return (session != null) ? session : new SessionRecord();
261 }
262
263 /**
264 * Returns all known devices with active sessions for a recipient
265 *
266 * @param name the name of the client.
267 * @return all known sub-devices with active sessions.
268 */
269 @Override
270 public List<Integer> getSubDeviceSessions(String name) {
271 return mXmppConnectionService.databaseBackend.getSubDeviceSessions(account,
272 new AxolotlAddress(name, 0));
273 }
274
275 /**
276 * Commit to storage the {@link SessionRecord} for a given recipientId + deviceId tuple.
277 *
278 * @param address the address of the remote client.
279 * @param record the current SessionRecord for the remote client.
280 */
281 @Override
282 public void storeSession(AxolotlAddress address, SessionRecord record) {
283 mXmppConnectionService.databaseBackend.storeSession(account, address, record);
284 }
285
286 /**
287 * Determine whether there is a committed {@link SessionRecord} for a recipientId + deviceId tuple.
288 *
289 * @param address the address of the remote client.
290 * @return true if a {@link SessionRecord} exists, false otherwise.
291 */
292 @Override
293 public boolean containsSession(AxolotlAddress address) {
294 return mXmppConnectionService.databaseBackend.containsSession(account, address);
295 }
296
297 /**
298 * Remove a {@link SessionRecord} for a recipientId + deviceId tuple.
299 *
300 * @param address the address of the remote client.
301 */
302 @Override
303 public void deleteSession(AxolotlAddress address) {
304 mXmppConnectionService.databaseBackend.deleteSession(account, address);
305 }
306
307 /**
308 * Remove the {@link SessionRecord}s corresponding to all devices of a recipientId.
309 *
310 * @param name the name of the remote client.
311 */
312 @Override
313 public void deleteAllSessions(String name) {
314 mXmppConnectionService.databaseBackend.deleteAllSessions(account,
315 new AxolotlAddress(name, 0));
316 }
317
318 public boolean isTrustedSession(AxolotlAddress address) {
319 return mXmppConnectionService.databaseBackend.isTrustedSession(this.account, address);
320 }
321
322 public void setTrustedSession(AxolotlAddress address, boolean trusted) {
323 mXmppConnectionService.databaseBackend.setTrustedSession(this.account, address, trusted);
324 }
325
326 // --------------------------------------
327 // PreKeyStore
328 // --------------------------------------
329
330 /**
331 * Load a local PreKeyRecord.
332 *
333 * @param preKeyId the ID of the local PreKeyRecord.
334 * @return the corresponding PreKeyRecord.
335 * @throws InvalidKeyIdException when there is no corresponding PreKeyRecord.
336 */
337 @Override
338 public PreKeyRecord loadPreKey(int preKeyId) throws InvalidKeyIdException {
339 PreKeyRecord record = mXmppConnectionService.databaseBackend.loadPreKey(account, preKeyId);
340 if (record == null) {
341 throw new InvalidKeyIdException("No such PreKeyRecord: " + preKeyId);
342 }
343 return record;
344 }
345
346 /**
347 * Store a local PreKeyRecord.
348 *
349 * @param preKeyId the ID of the PreKeyRecord to store.
350 * @param record the PreKeyRecord.
351 */
352 @Override
353 public void storePreKey(int preKeyId, PreKeyRecord record) {
354 mXmppConnectionService.databaseBackend.storePreKey(account, record);
355 currentPreKeyId = preKeyId;
356 boolean success = this.account.setKey(JSONKEY_CURRENT_PREKEY_ID, Integer.toString(preKeyId));
357 if (success) {
358 mXmppConnectionService.databaseBackend.updateAccount(account);
359 } else {
360 Log.e(Config.LOGTAG, "Failed to write new prekey id to the database!");
361 }
362 }
363
364 /**
365 * @param preKeyId A PreKeyRecord ID.
366 * @return true if the store has a record for the preKeyId, otherwise false.
367 */
368 @Override
369 public boolean containsPreKey(int preKeyId) {
370 return mXmppConnectionService.databaseBackend.containsPreKey(account, preKeyId);
371 }
372
373 /**
374 * Delete a PreKeyRecord from local storage.
375 *
376 * @param preKeyId The ID of the PreKeyRecord to remove.
377 */
378 @Override
379 public void removePreKey(int preKeyId) {
380 mXmppConnectionService.databaseBackend.deletePreKey(account, preKeyId);
381 }
382
383 // --------------------------------------
384 // SignedPreKeyStore
385 // --------------------------------------
386
387 /**
388 * Load a local SignedPreKeyRecord.
389 *
390 * @param signedPreKeyId the ID of the local SignedPreKeyRecord.
391 * @return the corresponding SignedPreKeyRecord.
392 * @throws InvalidKeyIdException when there is no corresponding SignedPreKeyRecord.
393 */
394 @Override
395 public SignedPreKeyRecord loadSignedPreKey(int signedPreKeyId) throws InvalidKeyIdException {
396 SignedPreKeyRecord record = mXmppConnectionService.databaseBackend.loadSignedPreKey(account, signedPreKeyId);
397 if (record == null) {
398 throw new InvalidKeyIdException("No such SignedPreKeyRecord: " + signedPreKeyId);
399 }
400 return record;
401 }
402
403 /**
404 * Load all local SignedPreKeyRecords.
405 *
406 * @return All stored SignedPreKeyRecords.
407 */
408 @Override
409 public List<SignedPreKeyRecord> loadSignedPreKeys() {
410 return mXmppConnectionService.databaseBackend.loadSignedPreKeys(account);
411 }
412
413 /**
414 * Store a local SignedPreKeyRecord.
415 *
416 * @param signedPreKeyId the ID of the SignedPreKeyRecord to store.
417 * @param record the SignedPreKeyRecord.
418 */
419 @Override
420 public void storeSignedPreKey(int signedPreKeyId, SignedPreKeyRecord record) {
421 mXmppConnectionService.databaseBackend.storeSignedPreKey(account, record);
422 }
423
424 /**
425 * @param signedPreKeyId A SignedPreKeyRecord ID.
426 * @return true if the store has a record for the signedPreKeyId, otherwise false.
427 */
428 @Override
429 public boolean containsSignedPreKey(int signedPreKeyId) {
430 return mXmppConnectionService.databaseBackend.containsSignedPreKey(account, signedPreKeyId);
431 }
432
433 /**
434 * Delete a SignedPreKeyRecord from local storage.
435 *
436 * @param signedPreKeyId The ID of the SignedPreKeyRecord to remove.
437 */
438 @Override
439 public void removeSignedPreKey(int signedPreKeyId) {
440 mXmppConnectionService.databaseBackend.deleteSignedPreKey(account, signedPreKeyId);
441 }
442 }
443
444 public static class XmppAxolotlSession {
445 private SessionCipher cipher;
446 private boolean isTrusted = false;
447 private SQLiteAxolotlStore sqLiteAxolotlStore;
448 private AxolotlAddress remoteAddress;
449
450 public XmppAxolotlSession(SQLiteAxolotlStore store, AxolotlAddress remoteAddress) {
451 this.cipher = new SessionCipher(store, remoteAddress);
452 this.remoteAddress = remoteAddress;
453 this.sqLiteAxolotlStore = store;
454 this.isTrusted = sqLiteAxolotlStore.isTrustedSession(remoteAddress);
455 }
456
457 public void trust() {
458 sqLiteAxolotlStore.setTrustedSession(remoteAddress, true);
459 this.isTrusted = true;
460 }
461
462 public boolean isTrusted() {
463 return this.isTrusted;
464 }
465
466 public byte[] processReceiving(XmppAxolotlMessage.XmppAxolotlMessageHeader incomingHeader) {
467 byte[] plaintext = null;
468 try {
469 try {
470 PreKeyWhisperMessage message = new PreKeyWhisperMessage(incomingHeader.getContents());
471 Log.d(Config.LOGTAG, "PreKeyWhisperMessage ID:" + message.getSignedPreKeyId() + "/" + message.getPreKeyId());
472 plaintext = cipher.decrypt(message);
473 } catch (InvalidMessageException | InvalidVersionException e) {
474 WhisperMessage message = new WhisperMessage(incomingHeader.getContents());
475 plaintext = cipher.decrypt(message);
476 } catch (InvalidKeyException | InvalidKeyIdException | UntrustedIdentityException e) {
477 Log.d(Config.LOGTAG, "Error decrypting axolotl header, "+e.getClass().getName()+": " + e.getMessage());
478 }
479 } catch (LegacyMessageException | InvalidMessageException e) {
480 Log.d(Config.LOGTAG, "Error decrypting axolotl header, "+e.getClass().getName()+": " + e.getMessage());
481 } catch (DuplicateMessageException | NoSessionException e) {
482 Log.d(Config.LOGTAG, "Error decrypting axolotl header, "+e.getClass().getName()+": " + e.getMessage());
483 }
484 return plaintext;
485 }
486
487 public XmppAxolotlMessage.XmppAxolotlMessageHeader processSending(byte[] outgoingMessage) {
488 CiphertextMessage ciphertextMessage = cipher.encrypt(outgoingMessage);
489 XmppAxolotlMessage.XmppAxolotlMessageHeader header =
490 new XmppAxolotlMessage.XmppAxolotlMessageHeader(remoteAddress.getDeviceId(),
491 ciphertextMessage.serialize());
492 return header;
493 }
494 }
495
496 private static class AxolotlAddressMap<T> {
497 protected Map<String, Map<Integer, T>> map;
498 protected final Object MAP_LOCK = new Object();
499
500 public AxolotlAddressMap() {
501 this.map = new HashMap<>();
502 }
503
504 public void put(AxolotlAddress address, T value) {
505 synchronized (MAP_LOCK) {
506 Map<Integer, T> devices = map.get(address.getName());
507 if (devices == null) {
508 devices = new HashMap<>();
509 map.put(address.getName(), devices);
510 }
511 devices.put(address.getDeviceId(), value);
512 }
513 }
514
515 public T get(AxolotlAddress address) {
516 synchronized (MAP_LOCK) {
517 Map<Integer, T> devices = map.get(address.getName());
518 if (devices == null) {
519 return null;
520 }
521 return devices.get(address.getDeviceId());
522 }
523 }
524
525 public Map<Integer, T> getAll(AxolotlAddress address) {
526 synchronized (MAP_LOCK) {
527 Map<Integer, T> devices = map.get(address.getName());
528 if (devices == null) {
529 return new HashMap<>();
530 }
531 return devices;
532 }
533 }
534
535 public boolean hasAny(AxolotlAddress address) {
536 synchronized (MAP_LOCK) {
537 Map<Integer, T> devices = map.get(address.getName());
538 return devices != null && !devices.isEmpty();
539 }
540 }
541
542
543 }
544
545 private static class SessionMap extends AxolotlAddressMap<XmppAxolotlSession> {
546
547 public SessionMap(SQLiteAxolotlStore store, Account account) {
548 super();
549 this.fillMap(store, account);
550 }
551
552 private void fillMap(SQLiteAxolotlStore store, Account account) {
553 for (Contact contact : account.getRoster().getContacts()) {
554 Jid bareJid = contact.getJid().toBareJid();
555 if (bareJid == null) {
556 continue; // FIXME: handle this?
557 }
558 String address = bareJid.toString();
559 List<Integer> deviceIDs = store.getSubDeviceSessions(address);
560 for (Integer deviceId : deviceIDs) {
561 AxolotlAddress axolotlAddress = new AxolotlAddress(address, deviceId);
562 this.put(axolotlAddress, new XmppAxolotlSession(store, axolotlAddress));
563 }
564 }
565 }
566
567 }
568
569 private static enum FetchStatus {
570 PENDING,
571 SUCCESS,
572 ERROR
573 }
574
575 private static class FetchStatusMap extends AxolotlAddressMap<FetchStatus> {
576
577 }
578
579 public AxolotlService(Account account, XmppConnectionService connectionService) {
580 this.mXmppConnectionService = connectionService;
581 this.account = account;
582 this.axolotlStore = new SQLiteAxolotlStore(this.account, this.mXmppConnectionService);
583 this.deviceIds = new HashMap<>();
584 this.messageCache = new HashMap<>();
585 this.sessions = new SessionMap(axolotlStore, account);
586 this.fetchStatusMap = new FetchStatusMap();
587 this.executor = new SerialSingleThreadExecutor();
588 this.ownDeviceId = axolotlStore.getLocalRegistrationId();
589 }
590
591 public void trustSession(AxolotlAddress counterpart) {
592 XmppAxolotlSession session = sessions.get(counterpart);
593 if (session != null) {
594 session.trust();
595 }
596 }
597
598 public boolean isTrustedSession(AxolotlAddress counterpart) {
599 XmppAxolotlSession session = sessions.get(counterpart);
600 return session != null && session.isTrusted();
601 }
602
603 private AxolotlAddress getAddressForJid(Jid jid) {
604 return new AxolotlAddress(jid.toString(), 0);
605 }
606
607 private Set<XmppAxolotlSession> findOwnSessions() {
608 AxolotlAddress ownAddress = getAddressForJid(account.getJid().toBareJid());
609 Set<XmppAxolotlSession> ownDeviceSessions = new HashSet<>(this.sessions.getAll(ownAddress).values());
610 return ownDeviceSessions;
611 }
612
613 private Set<XmppAxolotlSession> findSessionsforContact(Contact contact) {
614 AxolotlAddress contactAddress = getAddressForJid(contact.getJid());
615 Set<XmppAxolotlSession> sessions = new HashSet<>(this.sessions.getAll(contactAddress).values());
616 return sessions;
617 }
618
619 private boolean hasAny(Contact contact) {
620 AxolotlAddress contactAddress = getAddressForJid(contact.getJid());
621 return sessions.hasAny(contactAddress);
622 }
623
624 public int getOwnDeviceId() {
625 return ownDeviceId;
626 }
627
628 public void registerDevices(final Jid jid, final Set<Integer> deviceIds) {
629 for(Integer i:deviceIds) {
630 Log.d(Config.LOGTAG, "Adding Device ID:"+ jid + ":"+i);
631 }
632 this.deviceIds.put(jid, deviceIds);
633 }
634
635 public void publishOwnDeviceIdIfNeeded() {
636 IqPacket packet = mXmppConnectionService.getIqGenerator().retrieveDeviceIds(account.getJid().toBareJid());
637 mXmppConnectionService.sendIqPacket(account, packet, new OnIqPacketReceived() {
638 @Override
639 public void onIqPacketReceived(Account account, IqPacket packet) {
640 Element item = mXmppConnectionService.getIqParser().getItem(packet);
641 Set<Integer> deviceIds = mXmppConnectionService.getIqParser().deviceIds(item);
642 if (deviceIds == null) {
643 deviceIds = new HashSet<Integer>();
644 }
645 if (!deviceIds.contains(getOwnDeviceId())) {
646 deviceIds.add(getOwnDeviceId());
647 IqPacket publish = mXmppConnectionService.getIqGenerator().publishDeviceIds(deviceIds);
648 Log.d(Config.LOGTAG, "Own device " + getOwnDeviceId() + " not in PEP devicelist. Publishing: " + publish);
649 mXmppConnectionService.sendIqPacket(account, publish, new OnIqPacketReceived() {
650 @Override
651 public void onIqPacketReceived(Account account, IqPacket packet) {
652 // TODO: implement this!
653 }
654 });
655 }
656 }
657 });
658 }
659
660 public void publishBundlesIfNeeded() {
661 IqPacket packet = mXmppConnectionService.getIqGenerator().retrieveBundlesForDevice(account.getJid().toBareJid(), ownDeviceId);
662 mXmppConnectionService.sendIqPacket(account, packet, new OnIqPacketReceived() {
663 @Override
664 public void onIqPacketReceived(Account account, IqPacket packet) {
665 PreKeyBundle bundle = mXmppConnectionService.getIqParser().bundle(packet);
666 Map<Integer, ECPublicKey> keys = mXmppConnectionService.getIqParser().preKeyPublics(packet);
667 boolean flush = false;
668 if (bundle == null) {
669 Log.e(Config.LOGTAG, "Received invalid bundle:" + packet);
670 bundle = new PreKeyBundle(-1, -1, -1 , null, -1, null, null, null);
671 flush = true;
672 }
673 if (keys == null) {
674 Log.e(Config.LOGTAG, "Received invalid prekeys:" + packet);
675 }
676 try {
677 boolean changed = false;
678 // Validate IdentityKey
679 IdentityKeyPair identityKeyPair = axolotlStore.getIdentityKeyPair();
680 if (flush || !identityKeyPair.getPublicKey().equals(bundle.getIdentityKey())) {
681 Log.d(Config.LOGTAG, "Adding own IdentityKey " + identityKeyPair.getPublicKey() + " to PEP.");
682 changed = true;
683 }
684
685 // Validate signedPreKeyRecord + ID
686 SignedPreKeyRecord signedPreKeyRecord;
687 int numSignedPreKeys = axolotlStore.loadSignedPreKeys().size();
688 try {
689 signedPreKeyRecord = axolotlStore.loadSignedPreKey(bundle.getSignedPreKeyId());
690 if ( flush
691 ||!bundle.getSignedPreKey().equals(signedPreKeyRecord.getKeyPair().getPublicKey())
692 || !Arrays.equals(bundle.getSignedPreKeySignature(), signedPreKeyRecord.getSignature())) {
693 Log.d(Config.LOGTAG, "Adding new signedPreKey with ID " + (numSignedPreKeys + 1) + " to PEP.");
694 signedPreKeyRecord = KeyHelper.generateSignedPreKey(identityKeyPair, numSignedPreKeys + 1);
695 axolotlStore.storeSignedPreKey(signedPreKeyRecord.getId(), signedPreKeyRecord);
696 changed = true;
697 }
698 } catch (InvalidKeyIdException e) {
699 Log.d(Config.LOGTAG, "Adding new signedPreKey with ID " + (numSignedPreKeys + 1) + " to PEP.");
700 signedPreKeyRecord = KeyHelper.generateSignedPreKey(identityKeyPair, numSignedPreKeys + 1);
701 axolotlStore.storeSignedPreKey(signedPreKeyRecord.getId(), signedPreKeyRecord);
702 changed = true;
703 }
704
705 // Validate PreKeys
706 Set<PreKeyRecord> preKeyRecords = new HashSet<>();
707 if (keys != null) {
708 for (Integer id : keys.keySet()) {
709 try {
710 PreKeyRecord preKeyRecord = axolotlStore.loadPreKey(id);
711 if (preKeyRecord.getKeyPair().getPublicKey().equals(keys.get(id))) {
712 preKeyRecords.add(preKeyRecord);
713 }
714 } catch (InvalidKeyIdException ignored) {
715 }
716 }
717 }
718 int newKeys = NUM_KEYS_TO_PUBLISH - preKeyRecords.size();
719 if (newKeys > 0) {
720 List<PreKeyRecord> newRecords = KeyHelper.generatePreKeys(
721 axolotlStore.getCurrentPreKeyId()+1, newKeys);
722 preKeyRecords.addAll(newRecords);
723 for (PreKeyRecord record : newRecords) {
724 axolotlStore.storePreKey(record.getId(), record);
725 }
726 changed = true;
727 Log.d(Config.LOGTAG, "Adding " + newKeys + " new preKeys to PEP.");
728 }
729
730
731 if(changed) {
732 IqPacket publish = mXmppConnectionService.getIqGenerator().publishBundles(
733 signedPreKeyRecord, axolotlStore.getIdentityKeyPair().getPublicKey(),
734 preKeyRecords, ownDeviceId);
735 Log.d(Config.LOGTAG, "Bundle " + getOwnDeviceId() + " in PEP not current. Publishing: " + publish);
736 mXmppConnectionService.sendIqPacket(account, publish, new OnIqPacketReceived() {
737 @Override
738 public void onIqPacketReceived(Account account, IqPacket packet) {
739 // TODO: implement this!
740 Log.d(Config.LOGTAG, "Published bundle, got: " + packet);
741 }
742 });
743 }
744 } catch (InvalidKeyException e) {
745 Log.e(Config.LOGTAG, "Failed to publish bundle " + getOwnDeviceId() + ", reason: " + e.getMessage());
746 return;
747 }
748 }
749 });
750 }
751
752 public boolean isContactAxolotlCapable(Contact contact) {
753 Jid jid = contact.getJid().toBareJid();
754 AxolotlAddress address = new AxolotlAddress(jid.toString(), 0);
755 return sessions.hasAny(address) ||
756 ( deviceIds.containsKey(jid) && !deviceIds.get(jid).isEmpty());
757 }
758
759 private void buildSessionFromPEP(final Conversation conversation, final AxolotlAddress address) {
760 Log.d(Config.LOGTAG, "Building new sesstion for " + address.getDeviceId());
761
762 try {
763 IqPacket bundlesPacket = mXmppConnectionService.getIqGenerator().retrieveBundlesForDevice(
764 Jid.fromString(address.getName()), address.getDeviceId());
765 Log.d(Config.LOGTAG, "Retrieving bundle: " + bundlesPacket);
766 mXmppConnectionService.sendIqPacket(account, bundlesPacket, new OnIqPacketReceived() {
767 @Override
768 public void onIqPacketReceived(Account account, IqPacket packet) {
769 Log.d(Config.LOGTAG, "Received preKey IQ packet, processing...");
770 final IqParser parser = mXmppConnectionService.getIqParser();
771 final List<PreKeyBundle> preKeyBundleList = parser.preKeys(packet);
772 final PreKeyBundle bundle = parser.bundle(packet);
773 if (preKeyBundleList.isEmpty() || bundle == null) {
774 Log.d(Config.LOGTAG, "preKey IQ packet invalid: " + packet);
775 fetchStatusMap.put(address, FetchStatus.ERROR);
776 return;
777 }
778 Random random = new Random();
779 final PreKeyBundle preKey = preKeyBundleList.get(random.nextInt(preKeyBundleList.size()));
780 if (preKey == null) {
781 //should never happen
782 fetchStatusMap.put(address, FetchStatus.ERROR);
783 return;
784 }
785
786 final PreKeyBundle preKeyBundle = new PreKeyBundle(0, address.getDeviceId(),
787 preKey.getPreKeyId(), preKey.getPreKey(),
788 bundle.getSignedPreKeyId(), bundle.getSignedPreKey(),
789 bundle.getSignedPreKeySignature(), bundle.getIdentityKey());
790
791 axolotlStore.saveIdentity(address.getName(), bundle.getIdentityKey());
792
793 try {
794 SessionBuilder builder = new SessionBuilder(axolotlStore, address);
795 builder.process(preKeyBundle);
796 XmppAxolotlSession session = new XmppAxolotlSession(axolotlStore, address);
797 sessions.put(address, session);
798 fetchStatusMap.put(address, FetchStatus.SUCCESS);
799 } catch (UntrustedIdentityException|InvalidKeyException e) {
800 Log.d(Config.LOGTAG, "Error building session for " + address + ": "
801 + e.getClass().getName() + ", " + e.getMessage());
802 fetchStatusMap.put(address, FetchStatus.ERROR);
803 }
804
805 AxolotlAddress ownAddress = new AxolotlAddress(conversation.getAccount().getJid().toBareJid().toString(),0);
806 AxolotlAddress foreignAddress = new AxolotlAddress(conversation.getJid().toBareJid().toString(),0);
807 if (!fetchStatusMap.getAll(ownAddress).containsValue(FetchStatus.PENDING)
808 && !fetchStatusMap.getAll(foreignAddress).containsValue(FetchStatus.PENDING)) {
809 conversation.findUnsentMessagesWithEncryption(Message.ENCRYPTION_AXOLOTL,
810 new Conversation.OnMessageFound() {
811 @Override
812 public void onMessageFound(Message message) {
813 processSending(message);
814 }
815 });
816 }
817 }
818 });
819 } catch (InvalidJidException e) {
820 Log.e(Config.LOGTAG,"Got address with invalid jid: " + address.getName());
821 }
822 }
823
824 private boolean createSessionsIfNeeded(Conversation conversation) {
825 boolean newSessions = false;
826 Log.d(Config.LOGTAG, "Creating axolotl sessions if needed...");
827 Jid contactJid = conversation.getContact().getJid().toBareJid();
828 Set<AxolotlAddress> addresses = new HashSet<>();
829 if(deviceIds.get(contactJid) != null) {
830 for(Integer foreignId:this.deviceIds.get(contactJid)) {
831 Log.d(Config.LOGTAG, "Found device "+account.getJid().toBareJid()+":"+foreignId);
832 addresses.add(new AxolotlAddress(contactJid.toString(), foreignId));
833 }
834 } else {
835 Log.e(Config.LOGTAG, "Have no target devices in PEP!");
836 }
837 Log.d(Config.LOGTAG, "Checking own account "+account.getJid().toBareJid());
838 if(deviceIds.get(account.getJid().toBareJid()) != null) {
839 for(Integer ownId:this.deviceIds.get(account.getJid().toBareJid())) {
840 Log.d(Config.LOGTAG, "Found device "+account.getJid().toBareJid()+":"+ownId);
841 addresses.add(new AxolotlAddress(account.getJid().toBareJid().toString(), ownId));
842 }
843 }
844 for (AxolotlAddress address : addresses) {
845 Log.d(Config.LOGTAG, "Processing device: " + address.toString());
846 FetchStatus status = fetchStatusMap.get(address);
847 XmppAxolotlSession session = sessions.get(address);
848 if ( session == null && ( status == null || status == FetchStatus.ERROR) ) {
849 fetchStatusMap.put(address, FetchStatus.PENDING);
850 this.buildSessionFromPEP(conversation, address);
851 newSessions = true;
852 } else {
853 Log.d(Config.LOGTAG, "Already have session for " + address.toString());
854 }
855 }
856 return newSessions;
857 }
858
859 @Nullable
860 public XmppAxolotlMessage encrypt(Message message ){
861 final XmppAxolotlMessage axolotlMessage = new XmppAxolotlMessage(message.getContact().getJid().toBareJid(),
862 ownDeviceId, message.getBody());
863
864 if(findSessionsforContact(message.getContact()).isEmpty()) {
865 return null;
866 }
867 Log.d(Config.LOGTAG, "Building axolotl foreign headers...");
868 for (XmppAxolotlSession session : findSessionsforContact(message.getContact())) {
869 Log.d(Config.LOGTAG, session.remoteAddress.toString());
870 //if(!session.isTrusted()) {
871 // TODO: handle this properly
872 // continue;
873 // }
874 axolotlMessage.addHeader(session.processSending(axolotlMessage.getInnerKey()));
875 }
876 Log.d(Config.LOGTAG, "Building axolotl own headers...");
877 for (XmppAxolotlSession session : findOwnSessions()) {
878 Log.d(Config.LOGTAG, session.remoteAddress.toString());
879 // if(!session.isTrusted()) {
880 // TODO: handle this properly
881 // continue;
882 // }
883 axolotlMessage.addHeader(session.processSending(axolotlMessage.getInnerKey()));
884 }
885
886 return axolotlMessage;
887 }
888
889 private void processSending(final Message message) {
890 executor.execute(new Runnable() {
891 @Override
892 public void run() {
893 MessagePacket packet = mXmppConnectionService.getMessageGenerator()
894 .generateAxolotlChat(message);
895 if (packet == null) {
896 mXmppConnectionService.markMessage(message, Message.STATUS_SEND_FAILED);
897 //mXmppConnectionService.updateConversationUi();
898 } else {
899 Log.d(Config.LOGTAG, "Generated message, caching: " + message.getUuid());
900 messageCache.put(message.getUuid(), packet);
901 mXmppConnectionService.resendMessage(message);
902 }
903 }
904 });
905 }
906
907 public void prepareMessage(Message message) {
908 if (!messageCache.containsKey(message.getUuid())) {
909 boolean newSessions = createSessionsIfNeeded(message.getConversation());
910
911 if (!newSessions) {
912 this.processSending(message);
913 }
914 }
915 }
916
917 public MessagePacket fetchPacketFromCache(Message message) {
918 MessagePacket packet = messageCache.get(message.getUuid());
919 if (packet != null) {
920 Log.d(Config.LOGTAG, "Cache hit: " + message.getUuid());
921 messageCache.remove(message.getUuid());
922 } else {
923 Log.d(Config.LOGTAG, "Cache miss: " + message.getUuid());
924 }
925 return packet;
926 }
927
928 public XmppAxolotlMessage.XmppAxolotlPlaintextMessage processReceiving(XmppAxolotlMessage message) {
929 XmppAxolotlMessage.XmppAxolotlPlaintextMessage plaintextMessage = null;
930 AxolotlAddress senderAddress = new AxolotlAddress(message.getFrom().toString(),
931 message.getSenderDeviceId());
932
933 XmppAxolotlSession session = sessions.get(senderAddress);
934 if (session == null) {
935 Log.d(Config.LOGTAG, "Account: "+account.getJid()+" No axolotl session found while parsing received message " + message);
936 // TODO: handle this properly
937 session = new XmppAxolotlSession(axolotlStore, senderAddress);
938 sessions.put(senderAddress,session);
939 }
940
941 for (XmppAxolotlMessage.XmppAxolotlMessageHeader header : message.getHeaders()) {
942 if (header.getRecipientDeviceId() == ownDeviceId) {
943 Log.d(Config.LOGTAG, "Found axolotl header matching own device ID, processing...");
944 byte[] payloadKey = session.processReceiving(header);
945 if (payloadKey != null) {
946 Log.d(Config.LOGTAG, "Got payload key from axolotl header. Decrypting message...");
947 plaintextMessage = message.decrypt(session, payloadKey);
948 }
949 }
950 }
951
952 return plaintextMessage;
953 }
954}