1package eu.siacs.conversations.crypto.axolotl;
2
3import android.support.annotation.NonNull;
4import android.support.annotation.Nullable;
5import android.util.Log;
6
7import org.bouncycastle.jce.provider.BouncyCastleProvider;
8import org.whispersystems.libaxolotl.AxolotlAddress;
9import org.whispersystems.libaxolotl.IdentityKey;
10import org.whispersystems.libaxolotl.IdentityKeyPair;
11import org.whispersystems.libaxolotl.InvalidKeyException;
12import org.whispersystems.libaxolotl.InvalidKeyIdException;
13import org.whispersystems.libaxolotl.SessionBuilder;
14import org.whispersystems.libaxolotl.UntrustedIdentityException;
15import org.whispersystems.libaxolotl.ecc.ECPublicKey;
16import org.whispersystems.libaxolotl.state.PreKeyBundle;
17import org.whispersystems.libaxolotl.state.PreKeyRecord;
18import org.whispersystems.libaxolotl.state.SignedPreKeyRecord;
19import org.whispersystems.libaxolotl.util.KeyHelper;
20
21import java.security.Security;
22import java.util.Arrays;
23import java.util.HashMap;
24import java.util.HashSet;
25import java.util.List;
26import java.util.Map;
27import java.util.Random;
28import java.util.Set;
29
30import eu.siacs.conversations.Config;
31import eu.siacs.conversations.entities.Account;
32import eu.siacs.conversations.entities.Contact;
33import eu.siacs.conversations.entities.Conversation;
34import eu.siacs.conversations.entities.Message;
35import eu.siacs.conversations.parser.IqParser;
36import eu.siacs.conversations.services.XmppConnectionService;
37import eu.siacs.conversations.utils.SerialSingleThreadExecutor;
38import eu.siacs.conversations.xml.Element;
39import eu.siacs.conversations.xmpp.OnIqPacketReceived;
40import eu.siacs.conversations.xmpp.jid.InvalidJidException;
41import eu.siacs.conversations.xmpp.jid.Jid;
42import eu.siacs.conversations.xmpp.stanzas.IqPacket;
43
44public class AxolotlService {
45
46 public static final String PEP_PREFIX = "eu.siacs.conversations.axolotl";
47 public static final String PEP_DEVICE_LIST = PEP_PREFIX + ".devicelist";
48 public static final String PEP_BUNDLES = PEP_PREFIX + ".bundles";
49
50 public static final String LOGPREFIX = "AxolotlService";
51
52 public static final int NUM_KEYS_TO_PUBLISH = 100;
53
54 private final Account account;
55 private final XmppConnectionService mXmppConnectionService;
56 private final SQLiteAxolotlStore axolotlStore;
57 private final SessionMap sessions;
58 private final Map<Jid, Set<Integer>> deviceIds;
59 private final Map<String, XmppAxolotlMessage> messageCache;
60 private final FetchStatusMap fetchStatusMap;
61 private final SerialSingleThreadExecutor executor;
62
63 private static class AxolotlAddressMap<T> {
64 protected Map<String, Map<Integer, T>> map;
65 protected final Object MAP_LOCK = new Object();
66
67 public AxolotlAddressMap() {
68 this.map = new HashMap<>();
69 }
70
71 public void put(AxolotlAddress address, T value) {
72 synchronized (MAP_LOCK) {
73 Map<Integer, T> devices = map.get(address.getName());
74 if (devices == null) {
75 devices = new HashMap<>();
76 map.put(address.getName(), devices);
77 }
78 devices.put(address.getDeviceId(), value);
79 }
80 }
81
82 public T get(AxolotlAddress address) {
83 synchronized (MAP_LOCK) {
84 Map<Integer, T> devices = map.get(address.getName());
85 if (devices == null) {
86 return null;
87 }
88 return devices.get(address.getDeviceId());
89 }
90 }
91
92 public Map<Integer, T> getAll(AxolotlAddress address) {
93 synchronized (MAP_LOCK) {
94 Map<Integer, T> devices = map.get(address.getName());
95 if (devices == null) {
96 return new HashMap<>();
97 }
98 return devices;
99 }
100 }
101
102 public boolean hasAny(AxolotlAddress address) {
103 synchronized (MAP_LOCK) {
104 Map<Integer, T> devices = map.get(address.getName());
105 return devices != null && !devices.isEmpty();
106 }
107 }
108
109 public void clear() {
110 map.clear();
111 }
112
113 }
114
115 private static class SessionMap extends AxolotlAddressMap<XmppAxolotlSession> {
116 private final XmppConnectionService xmppConnectionService;
117 private final Account account;
118
119 public SessionMap(XmppConnectionService service, SQLiteAxolotlStore store, Account account) {
120 super();
121 this.xmppConnectionService = service;
122 this.account = account;
123 this.fillMap(store);
124 }
125
126 private void putDevicesForJid(String bareJid, List<Integer> deviceIds, SQLiteAxolotlStore store) {
127 for (Integer deviceId : deviceIds) {
128 AxolotlAddress axolotlAddress = new AxolotlAddress(bareJid, deviceId);
129 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Building session for remote address: " + axolotlAddress.toString());
130 String fingerprint = store.loadSession(axolotlAddress).getSessionState().getRemoteIdentityKey().getFingerprint().replaceAll("\\s", "");
131 this.put(axolotlAddress, new XmppAxolotlSession(account, store, axolotlAddress, fingerprint));
132 }
133 }
134
135 private void fillMap(SQLiteAxolotlStore store) {
136 List<Integer> deviceIds = store.getSubDeviceSessions(account.getJid().toBareJid().toString());
137 putDevicesForJid(account.getJid().toBareJid().toString(), deviceIds, store);
138 for (Contact contact : account.getRoster().getContacts()) {
139 Jid bareJid = contact.getJid().toBareJid();
140 if (bareJid == null) {
141 continue; // FIXME: handle this?
142 }
143 String address = bareJid.toString();
144 deviceIds = store.getSubDeviceSessions(address);
145 putDevicesForJid(address, deviceIds, store);
146 }
147
148 }
149
150 @Override
151 public void put(AxolotlAddress address, XmppAxolotlSession value) {
152 super.put(address, value);
153 value.setNotFresh();
154 xmppConnectionService.syncRosterToDisk(account);
155 }
156
157 public void put(XmppAxolotlSession session) {
158 this.put(session.getRemoteAddress(), session);
159 }
160 }
161
162 private static enum FetchStatus {
163 PENDING,
164 SUCCESS,
165 ERROR
166 }
167
168 private static class FetchStatusMap extends AxolotlAddressMap<FetchStatus> {
169
170 }
171
172 public static String getLogprefix(Account account) {
173 return LOGPREFIX + " (" + account.getJid().toBareJid().toString() + "): ";
174 }
175
176 public AxolotlService(Account account, XmppConnectionService connectionService) {
177 if (Security.getProvider("BC") == null) {
178 Security.addProvider(new BouncyCastleProvider());
179 }
180 this.mXmppConnectionService = connectionService;
181 this.account = account;
182 this.axolotlStore = new SQLiteAxolotlStore(this.account, this.mXmppConnectionService);
183 this.deviceIds = new HashMap<>();
184 this.messageCache = new HashMap<>();
185 this.sessions = new SessionMap(mXmppConnectionService, axolotlStore, account);
186 this.fetchStatusMap = new FetchStatusMap();
187 this.executor = new SerialSingleThreadExecutor();
188 }
189
190 public IdentityKey getOwnPublicKey() {
191 return axolotlStore.getIdentityKeyPair().getPublicKey();
192 }
193
194 public Set<IdentityKey> getKeysWithTrust(XmppAxolotlSession.Trust trust) {
195 return axolotlStore.getContactKeysWithTrust(account.getJid().toBareJid().toString(), trust);
196 }
197
198 public Set<IdentityKey> getKeysWithTrust(XmppAxolotlSession.Trust trust, Contact contact) {
199 return axolotlStore.getContactKeysWithTrust(contact.getJid().toBareJid().toString(), trust);
200 }
201
202 public long getNumTrustedKeys(Contact contact) {
203 return axolotlStore.getContactNumTrustedKeys(contact.getJid().toBareJid().toString());
204 }
205
206 private AxolotlAddress getAddressForJid(Jid jid) {
207 return new AxolotlAddress(jid.toString(), 0);
208 }
209
210 private Set<XmppAxolotlSession> findOwnSessions() {
211 AxolotlAddress ownAddress = getAddressForJid(account.getJid().toBareJid());
212 Set<XmppAxolotlSession> ownDeviceSessions = new HashSet<>(this.sessions.getAll(ownAddress).values());
213 return ownDeviceSessions;
214 }
215
216 private Set<XmppAxolotlSession> findSessionsforContact(Contact contact) {
217 AxolotlAddress contactAddress = getAddressForJid(contact.getJid());
218 Set<XmppAxolotlSession> sessions = new HashSet<>(this.sessions.getAll(contactAddress).values());
219 return sessions;
220 }
221
222 private boolean hasAny(Contact contact) {
223 AxolotlAddress contactAddress = getAddressForJid(contact.getJid());
224 return sessions.hasAny(contactAddress);
225 }
226
227 public void regenerateKeys() {
228 axolotlStore.regenerate();
229 sessions.clear();
230 fetchStatusMap.clear();
231 publishBundlesIfNeeded();
232 publishOwnDeviceIdIfNeeded();
233 }
234
235 public int getOwnDeviceId() {
236 return axolotlStore.getLocalRegistrationId();
237 }
238
239 public Set<Integer> getOwnDeviceIds() {
240 return this.deviceIds.get(account.getJid().toBareJid());
241 }
242
243 private void setTrustOnSessions(final Jid jid, @NonNull final Set<Integer> deviceIds,
244 final XmppAxolotlSession.Trust from,
245 final XmppAxolotlSession.Trust to) {
246 for (Integer deviceId : deviceIds) {
247 AxolotlAddress address = new AxolotlAddress(jid.toBareJid().toString(), deviceId);
248 XmppAxolotlSession session = sessions.get(address);
249 if (session != null && session.getFingerprint() != null
250 && session.getTrust() == from) {
251 session.setTrust(to);
252 }
253 }
254 }
255
256 public void registerDevices(final Jid jid, @NonNull final Set<Integer> deviceIds) {
257 if (jid.toBareJid().equals(account.getJid().toBareJid())) {
258 if (deviceIds.contains(getOwnDeviceId())) {
259 deviceIds.remove(getOwnDeviceId());
260 }
261 for (Integer deviceId : deviceIds) {
262 AxolotlAddress ownDeviceAddress = new AxolotlAddress(jid.toBareJid().toString(), deviceId);
263 if (sessions.get(ownDeviceAddress) == null) {
264 buildSessionFromPEP(ownDeviceAddress);
265 }
266 }
267 }
268 Set<Integer> expiredDevices = new HashSet<>(axolotlStore.getSubDeviceSessions(jid.toBareJid().toString()));
269 expiredDevices.removeAll(deviceIds);
270 setTrustOnSessions(jid, expiredDevices, XmppAxolotlSession.Trust.TRUSTED,
271 XmppAxolotlSession.Trust.INACTIVE_TRUSTED);
272 setTrustOnSessions(jid, expiredDevices, XmppAxolotlSession.Trust.UNDECIDED,
273 XmppAxolotlSession.Trust.INACTIVE_UNDECIDED);
274 setTrustOnSessions(jid, expiredDevices, XmppAxolotlSession.Trust.UNTRUSTED,
275 XmppAxolotlSession.Trust.INACTIVE_UNTRUSTED);
276 Set<Integer> newDevices = new HashSet<>(deviceIds);
277 setTrustOnSessions(jid, newDevices, XmppAxolotlSession.Trust.INACTIVE_TRUSTED,
278 XmppAxolotlSession.Trust.TRUSTED);
279 setTrustOnSessions(jid, newDevices, XmppAxolotlSession.Trust.INACTIVE_UNDECIDED,
280 XmppAxolotlSession.Trust.UNDECIDED);
281 setTrustOnSessions(jid, newDevices, XmppAxolotlSession.Trust.INACTIVE_UNTRUSTED,
282 XmppAxolotlSession.Trust.UNTRUSTED);
283 this.deviceIds.put(jid, deviceIds);
284 mXmppConnectionService.keyStatusUpdated();
285 publishOwnDeviceIdIfNeeded();
286 }
287
288 public void wipeOtherPepDevices() {
289 Set<Integer> deviceIds = new HashSet<>();
290 deviceIds.add(getOwnDeviceId());
291 IqPacket publish = mXmppConnectionService.getIqGenerator().publishDeviceIds(deviceIds);
292 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Wiping all other devices from Pep:" + publish);
293 mXmppConnectionService.sendIqPacket(account, publish, new OnIqPacketReceived() {
294 @Override
295 public void onIqPacketReceived(Account account, IqPacket packet) {
296 // TODO: implement this!
297 }
298 });
299 }
300
301 public void purgeKey(IdentityKey identityKey) {
302 axolotlStore.setFingerprintTrust(identityKey.getFingerprint().replaceAll("\\s", ""), XmppAxolotlSession.Trust.COMPROMISED);
303 }
304
305 public void publishOwnDeviceIdIfNeeded() {
306 IqPacket packet = mXmppConnectionService.getIqGenerator().retrieveDeviceIds(account.getJid().toBareJid());
307 mXmppConnectionService.sendIqPacket(account, packet, new OnIqPacketReceived() {
308 @Override
309 public void onIqPacketReceived(Account account, IqPacket packet) {
310 if (packet.getType() == IqPacket.TYPE.RESULT) {
311 Element item = mXmppConnectionService.getIqParser().getItem(packet);
312 Set<Integer> deviceIds = mXmppConnectionService.getIqParser().deviceIds(item);
313 if (deviceIds == null) {
314 deviceIds = new HashSet<Integer>();
315 }
316 if (!deviceIds.contains(getOwnDeviceId())) {
317 deviceIds.add(getOwnDeviceId());
318 IqPacket publish = mXmppConnectionService.getIqGenerator().publishDeviceIds(deviceIds);
319 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Own device " + getOwnDeviceId() + " not in PEP devicelist. Publishing: " + publish);
320 mXmppConnectionService.sendIqPacket(account, publish, new OnIqPacketReceived() {
321 @Override
322 public void onIqPacketReceived(Account account, IqPacket packet) {
323 // TODO: implement this!
324 }
325 });
326 }
327 } else {
328 Log.d(Config.LOGTAG, getLogprefix(account) + "Error received while publishing device ID:" + packet.findChild("error"));
329 }
330 }
331 });
332 }
333
334 public void publishBundlesIfNeeded() {
335 IqPacket packet = mXmppConnectionService.getIqGenerator().retrieveBundlesForDevice(account.getJid().toBareJid(), getOwnDeviceId());
336 mXmppConnectionService.sendIqPacket(account, packet, new OnIqPacketReceived() {
337 @Override
338 public void onIqPacketReceived(Account account, IqPacket packet) {
339 if (packet.getType() == IqPacket.TYPE.RESULT) {
340 PreKeyBundle bundle = mXmppConnectionService.getIqParser().bundle(packet);
341 Map<Integer, ECPublicKey> keys = mXmppConnectionService.getIqParser().preKeyPublics(packet);
342 boolean flush = false;
343 if (bundle == null) {
344 Log.w(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Received invalid bundle:" + packet);
345 bundle = new PreKeyBundle(-1, -1, -1, null, -1, null, null, null);
346 flush = true;
347 }
348 if (keys == null) {
349 Log.w(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Received invalid prekeys:" + packet);
350 }
351 try {
352 boolean changed = false;
353 // Validate IdentityKey
354 IdentityKeyPair identityKeyPair = axolotlStore.getIdentityKeyPair();
355 if (flush || !identityKeyPair.getPublicKey().equals(bundle.getIdentityKey())) {
356 Log.i(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Adding own IdentityKey " + identityKeyPair.getPublicKey() + " to PEP.");
357 changed = true;
358 }
359
360 // Validate signedPreKeyRecord + ID
361 SignedPreKeyRecord signedPreKeyRecord;
362 int numSignedPreKeys = axolotlStore.loadSignedPreKeys().size();
363 try {
364 signedPreKeyRecord = axolotlStore.loadSignedPreKey(bundle.getSignedPreKeyId());
365 if (flush
366 || !bundle.getSignedPreKey().equals(signedPreKeyRecord.getKeyPair().getPublicKey())
367 || !Arrays.equals(bundle.getSignedPreKeySignature(), signedPreKeyRecord.getSignature())) {
368 Log.i(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Adding new signedPreKey with ID " + (numSignedPreKeys + 1) + " to PEP.");
369 signedPreKeyRecord = KeyHelper.generateSignedPreKey(identityKeyPair, numSignedPreKeys + 1);
370 axolotlStore.storeSignedPreKey(signedPreKeyRecord.getId(), signedPreKeyRecord);
371 changed = true;
372 }
373 } catch (InvalidKeyIdException e) {
374 Log.i(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Adding new signedPreKey with ID " + (numSignedPreKeys + 1) + " to PEP.");
375 signedPreKeyRecord = KeyHelper.generateSignedPreKey(identityKeyPair, numSignedPreKeys + 1);
376 axolotlStore.storeSignedPreKey(signedPreKeyRecord.getId(), signedPreKeyRecord);
377 changed = true;
378 }
379
380 // Validate PreKeys
381 Set<PreKeyRecord> preKeyRecords = new HashSet<>();
382 if (keys != null) {
383 for (Integer id : keys.keySet()) {
384 try {
385 PreKeyRecord preKeyRecord = axolotlStore.loadPreKey(id);
386 if (preKeyRecord.getKeyPair().getPublicKey().equals(keys.get(id))) {
387 preKeyRecords.add(preKeyRecord);
388 }
389 } catch (InvalidKeyIdException ignored) {
390 }
391 }
392 }
393 int newKeys = NUM_KEYS_TO_PUBLISH - preKeyRecords.size();
394 if (newKeys > 0) {
395 List<PreKeyRecord> newRecords = KeyHelper.generatePreKeys(
396 axolotlStore.getCurrentPreKeyId() + 1, newKeys);
397 preKeyRecords.addAll(newRecords);
398 for (PreKeyRecord record : newRecords) {
399 axolotlStore.storePreKey(record.getId(), record);
400 }
401 changed = true;
402 Log.i(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Adding " + newKeys + " new preKeys to PEP.");
403 }
404
405
406 if (changed) {
407 IqPacket publish = mXmppConnectionService.getIqGenerator().publishBundles(
408 signedPreKeyRecord, axolotlStore.getIdentityKeyPair().getPublicKey(),
409 preKeyRecords, getOwnDeviceId());
410 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + ": Bundle " + getOwnDeviceId() + " in PEP not current. Publishing: " + publish);
411 mXmppConnectionService.sendIqPacket(account, publish, new OnIqPacketReceived() {
412 @Override
413 public void onIqPacketReceived(Account account, IqPacket packet) {
414 // TODO: implement this!
415 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Published bundle, got: " + packet);
416 }
417 });
418 }
419 } catch (InvalidKeyException e) {
420 Log.e(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Failed to publish bundle " + getOwnDeviceId() + ", reason: " + e.getMessage());
421 return;
422 }
423 } else {
424 Log.d(Config.LOGTAG, getLogprefix(account) + "Error received while publishing Bundle:" + packet.findChild("error"));
425 }
426 }
427 });
428 }
429
430 public boolean isContactAxolotlCapable(Contact contact) {
431
432 Jid jid = contact.getJid().toBareJid();
433 AxolotlAddress address = new AxolotlAddress(jid.toString(), 0);
434 return sessions.hasAny(address) ||
435 (deviceIds.containsKey(jid) && !deviceIds.get(jid).isEmpty());
436 }
437
438 public XmppAxolotlSession.Trust getFingerprintTrust(String fingerprint) {
439 return axolotlStore.getFingerprintTrust(fingerprint);
440 }
441
442 public void setFingerprintTrust(String fingerprint, XmppAxolotlSession.Trust trust) {
443 axolotlStore.setFingerprintTrust(fingerprint, trust);
444 }
445
446 private void buildSessionFromPEP(final AxolotlAddress address) {
447 Log.i(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Building new sesstion for " + address.getDeviceId());
448
449 try {
450 IqPacket bundlesPacket = mXmppConnectionService.getIqGenerator().retrieveBundlesForDevice(
451 Jid.fromString(address.getName()), address.getDeviceId());
452 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Retrieving bundle: " + bundlesPacket);
453 mXmppConnectionService.sendIqPacket(account, bundlesPacket, new OnIqPacketReceived() {
454 private void finish() {
455 AxolotlAddress ownAddress = new AxolotlAddress(account.getJid().toBareJid().toString(), 0);
456 if (!fetchStatusMap.getAll(ownAddress).containsValue(FetchStatus.PENDING)
457 && !fetchStatusMap.getAll(address).containsValue(FetchStatus.PENDING)) {
458 mXmppConnectionService.keyStatusUpdated();
459 }
460 }
461
462 @Override
463 public void onIqPacketReceived(Account account, IqPacket packet) {
464 if (packet.getType() == IqPacket.TYPE.RESULT) {
465 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Received preKey IQ packet, processing...");
466 final IqParser parser = mXmppConnectionService.getIqParser();
467 final List<PreKeyBundle> preKeyBundleList = parser.preKeys(packet);
468 final PreKeyBundle bundle = parser.bundle(packet);
469 if (preKeyBundleList.isEmpty() || bundle == null) {
470 Log.e(Config.LOGTAG, AxolotlService.getLogprefix(account) + "preKey IQ packet invalid: " + packet);
471 fetchStatusMap.put(address, FetchStatus.ERROR);
472 finish();
473 return;
474 }
475 Random random = new Random();
476 final PreKeyBundle preKey = preKeyBundleList.get(random.nextInt(preKeyBundleList.size()));
477 if (preKey == null) {
478 //should never happen
479 fetchStatusMap.put(address, FetchStatus.ERROR);
480 finish();
481 return;
482 }
483
484 final PreKeyBundle preKeyBundle = new PreKeyBundle(0, address.getDeviceId(),
485 preKey.getPreKeyId(), preKey.getPreKey(),
486 bundle.getSignedPreKeyId(), bundle.getSignedPreKey(),
487 bundle.getSignedPreKeySignature(), bundle.getIdentityKey());
488
489 axolotlStore.saveIdentity(address.getName(), bundle.getIdentityKey());
490
491 try {
492 SessionBuilder builder = new SessionBuilder(axolotlStore, address);
493 builder.process(preKeyBundle);
494 XmppAxolotlSession session = new XmppAxolotlSession(account, axolotlStore, address, bundle.getIdentityKey().getFingerprint().replaceAll("\\s", ""));
495 sessions.put(address, session);
496 fetchStatusMap.put(address, FetchStatus.SUCCESS);
497 } catch (UntrustedIdentityException | InvalidKeyException e) {
498 Log.e(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Error building session for " + address + ": "
499 + e.getClass().getName() + ", " + e.getMessage());
500 fetchStatusMap.put(address, FetchStatus.ERROR);
501 }
502
503 finish();
504 } else {
505 fetchStatusMap.put(address, FetchStatus.ERROR);
506 Log.d(Config.LOGTAG, getLogprefix(account) + "Error received while building session:" + packet.findChild("error"));
507 finish();
508 return;
509 }
510 }
511 });
512 } catch (InvalidJidException e) {
513 Log.e(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Got address with invalid jid: " + address.getName());
514 }
515 }
516
517 public Set<AxolotlAddress> findDevicesWithoutSession(final Conversation conversation) {
518 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Finding devices without session for " + conversation.getContact().getJid().toBareJid());
519 Jid contactJid = conversation.getContact().getJid().toBareJid();
520 Set<AxolotlAddress> addresses = new HashSet<>();
521 if (deviceIds.get(contactJid) != null) {
522 for (Integer foreignId : this.deviceIds.get(contactJid)) {
523 AxolotlAddress address = new AxolotlAddress(contactJid.toString(), foreignId);
524 if (sessions.get(address) == null) {
525 IdentityKey identityKey = axolotlStore.loadSession(address).getSessionState().getRemoteIdentityKey();
526 if (identityKey != null) {
527 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Already have session for " + address.toString() + ", adding to cache...");
528 XmppAxolotlSession session = new XmppAxolotlSession(account, axolotlStore, address, identityKey.getFingerprint().replaceAll("\\s", ""));
529 sessions.put(address, session);
530 } else {
531 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Found device " + account.getJid().toBareJid() + ":" + foreignId);
532 addresses.add(new AxolotlAddress(contactJid.toString(), foreignId));
533 }
534 }
535 }
536 } else {
537 Log.w(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Have no target devices in PEP!");
538 }
539 if (deviceIds.get(account.getJid().toBareJid()) != null) {
540 for (Integer ownId : this.deviceIds.get(account.getJid().toBareJid())) {
541 AxolotlAddress address = new AxolotlAddress(account.getJid().toBareJid().toString(), ownId);
542 if (sessions.get(address) == null) {
543 IdentityKey identityKey = axolotlStore.loadSession(address).getSessionState().getRemoteIdentityKey();
544 if (identityKey != null) {
545 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Already have session for " + address.toString() + ", adding to cache...");
546 XmppAxolotlSession session = new XmppAxolotlSession(account, axolotlStore, address, identityKey.getFingerprint().replaceAll("\\s", ""));
547 sessions.put(address, session);
548 } else {
549 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Found device " + account.getJid().toBareJid() + ":" + ownId);
550 addresses.add(new AxolotlAddress(account.getJid().toBareJid().toString(), ownId));
551 }
552 }
553 }
554 }
555
556 return addresses;
557 }
558
559 public boolean createSessionsIfNeeded(final Conversation conversation) {
560 Log.i(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Creating axolotl sessions if needed...");
561 boolean newSessions = false;
562 Set<AxolotlAddress> addresses = findDevicesWithoutSession(conversation);
563 for (AxolotlAddress address : addresses) {
564 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Processing device: " + address.toString());
565 FetchStatus status = fetchStatusMap.get(address);
566 if (status == null || status == FetchStatus.ERROR) {
567 fetchStatusMap.put(address, FetchStatus.PENDING);
568 this.buildSessionFromPEP(address);
569 newSessions = true;
570 } else if (status == FetchStatus.PENDING) {
571 newSessions = true;
572 } else {
573 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Already fetching bundle for " + address.toString());
574 }
575 }
576
577 return newSessions;
578 }
579
580 public boolean hasPendingKeyFetches(Conversation conversation) {
581 AxolotlAddress ownAddress = new AxolotlAddress(account.getJid().toBareJid().toString(), 0);
582 AxolotlAddress foreignAddress = new AxolotlAddress(conversation.getJid().toBareJid().toString(), 0);
583 return fetchStatusMap.getAll(ownAddress).containsValue(FetchStatus.PENDING)
584 || fetchStatusMap.getAll(foreignAddress).containsValue(FetchStatus.PENDING);
585
586 }
587
588 @Nullable
589 private XmppAxolotlMessage buildHeader(Contact contact) {
590 final XmppAxolotlMessage axolotlMessage = new XmppAxolotlMessage(
591 contact.getJid().toBareJid(), getOwnDeviceId());
592
593 Set<XmppAxolotlSession> contactSessions = findSessionsforContact(contact);
594 Set<XmppAxolotlSession> ownSessions = findOwnSessions();
595 if (contactSessions.isEmpty()) {
596 return null;
597 }
598 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Building axolotl foreign keyElements...");
599 for (XmppAxolotlSession session : contactSessions) {
600 Log.v(Config.LOGTAG, AxolotlService.getLogprefix(account) + session.getRemoteAddress().toString());
601 axolotlMessage.addDevice(session);
602 }
603 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Building axolotl own keyElements...");
604 for (XmppAxolotlSession session : ownSessions) {
605 Log.v(Config.LOGTAG, AxolotlService.getLogprefix(account) + session.getRemoteAddress().toString());
606 axolotlMessage.addDevice(session);
607 }
608
609 return axolotlMessage;
610 }
611
612 @Nullable
613 public XmppAxolotlMessage encrypt(Message message) {
614 XmppAxolotlMessage axolotlMessage = buildHeader(message.getContact());
615
616 if (axolotlMessage != null) {
617 final String content;
618 if (message.hasFileOnRemoteHost()) {
619 content = message.getFileParams().url.toString();
620 } else {
621 content = message.getBody();
622 }
623 try {
624 axolotlMessage.encrypt(content);
625 } catch (CryptoFailedException e) {
626 Log.w(Config.LOGTAG, getLogprefix(account) + "Failed to encrypt message: " + e.getMessage());
627 return null;
628 }
629 }
630
631 return axolotlMessage;
632 }
633
634 public void preparePayloadMessage(final Message message, final boolean delay) {
635 executor.execute(new Runnable() {
636 @Override
637 public void run() {
638 XmppAxolotlMessage axolotlMessage = encrypt(message);
639 if (axolotlMessage == null) {
640 mXmppConnectionService.markMessage(message, Message.STATUS_SEND_FAILED);
641 //mXmppConnectionService.updateConversationUi();
642 } else {
643 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Generated message, caching: " + message.getUuid());
644 messageCache.put(message.getUuid(), axolotlMessage);
645 mXmppConnectionService.resendMessage(message, delay);
646 }
647 }
648 });
649 }
650
651 public void prepareKeyTransportMessage(final Contact contact, final OnMessageCreatedCallback onMessageCreatedCallback) {
652 executor.execute(new Runnable() {
653 @Override
654 public void run() {
655 XmppAxolotlMessage axolotlMessage = buildHeader(contact);
656 onMessageCreatedCallback.run(axolotlMessage);
657 }
658 });
659 }
660
661 public XmppAxolotlMessage fetchAxolotlMessageFromCache(Message message) {
662 XmppAxolotlMessage axolotlMessage = messageCache.get(message.getUuid());
663 if (axolotlMessage != null) {
664 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Cache hit: " + message.getUuid());
665 messageCache.remove(message.getUuid());
666 } else {
667 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Cache miss: " + message.getUuid());
668 }
669 return axolotlMessage;
670 }
671
672 private XmppAxolotlSession recreateUncachedSession(AxolotlAddress address) {
673 IdentityKey identityKey = axolotlStore.loadSession(address).getSessionState().getRemoteIdentityKey();
674 return (identityKey != null)
675 ? new XmppAxolotlSession(account, axolotlStore, address,
676 identityKey.getFingerprint().replaceAll("\\s", ""))
677 : null;
678 }
679
680 private XmppAxolotlSession getReceivingSession(XmppAxolotlMessage message) {
681 AxolotlAddress senderAddress = new AxolotlAddress(message.getFrom().toString(),
682 message.getSenderDeviceId());
683 XmppAxolotlSession session = sessions.get(senderAddress);
684 if (session == null) {
685 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Account: " + account.getJid() + " No axolotl session found while parsing received message " + message);
686 session = recreateUncachedSession(senderAddress);
687 if (session == null) {
688 session = new XmppAxolotlSession(account, axolotlStore, senderAddress);
689 }
690 }
691 return session;
692 }
693
694 public XmppAxolotlMessage.XmppAxolotlPlaintextMessage processReceivingPayloadMessage(XmppAxolotlMessage message) {
695 XmppAxolotlMessage.XmppAxolotlPlaintextMessage plaintextMessage = null;
696
697 XmppAxolotlSession session = getReceivingSession(message);
698 try {
699 plaintextMessage = message.decrypt(session, getOwnDeviceId());
700 Integer preKeyId = session.getPreKeyId();
701 if (preKeyId != null) {
702 publishBundlesIfNeeded();
703 session.resetPreKeyId();
704 }
705 } catch (CryptoFailedException e) {
706 Log.w(Config.LOGTAG, getLogprefix(account) + "Failed to decrypt message: " + e.getMessage());
707 }
708
709 if (session.isFresh() && plaintextMessage != null) {
710 sessions.put(session);
711 }
712
713 return plaintextMessage;
714 }
715
716 public XmppAxolotlMessage.XmppAxolotlKeyTransportMessage processReceivingKeyTransportMessage(XmppAxolotlMessage message) {
717 XmppAxolotlMessage.XmppAxolotlKeyTransportMessage keyTransportMessage = null;
718
719 XmppAxolotlSession session = getReceivingSession(message);
720 keyTransportMessage = message.getParameters(session, getOwnDeviceId());
721
722 if (session.isFresh() && keyTransportMessage != null) {
723 sessions.put(session);
724 }
725
726 return keyTransportMessage;
727 }
728}