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 public static final int publishTriesThreshold = 3;
54
55 private final Account account;
56 private final XmppConnectionService mXmppConnectionService;
57 private final SQLiteAxolotlStore axolotlStore;
58 private final SessionMap sessions;
59 private final Map<Jid, Set<Integer>> deviceIds;
60 private final Map<String, XmppAxolotlMessage> messageCache;
61 private final FetchStatusMap fetchStatusMap;
62 private final SerialSingleThreadExecutor executor;
63 private int numPublishTriesOnEmptyPep = 0;
64 private boolean pepBroken = false;
65
66 private static class AxolotlAddressMap<T> {
67 protected Map<String, Map<Integer, T>> map;
68 protected final Object MAP_LOCK = new Object();
69
70 public AxolotlAddressMap() {
71 this.map = new HashMap<>();
72 }
73
74 public void put(AxolotlAddress address, T value) {
75 synchronized (MAP_LOCK) {
76 Map<Integer, T> devices = map.get(address.getName());
77 if (devices == null) {
78 devices = new HashMap<>();
79 map.put(address.getName(), devices);
80 }
81 devices.put(address.getDeviceId(), value);
82 }
83 }
84
85 public T get(AxolotlAddress address) {
86 synchronized (MAP_LOCK) {
87 Map<Integer, T> devices = map.get(address.getName());
88 if (devices == null) {
89 return null;
90 }
91 return devices.get(address.getDeviceId());
92 }
93 }
94
95 public Map<Integer, T> getAll(AxolotlAddress address) {
96 synchronized (MAP_LOCK) {
97 Map<Integer, T> devices = map.get(address.getName());
98 if (devices == null) {
99 return new HashMap<>();
100 }
101 return devices;
102 }
103 }
104
105 public boolean hasAny(AxolotlAddress address) {
106 synchronized (MAP_LOCK) {
107 Map<Integer, T> devices = map.get(address.getName());
108 return devices != null && !devices.isEmpty();
109 }
110 }
111
112 public void clear() {
113 map.clear();
114 }
115
116 }
117
118 private static class SessionMap extends AxolotlAddressMap<XmppAxolotlSession> {
119 private final XmppConnectionService xmppConnectionService;
120 private final Account account;
121
122 public SessionMap(XmppConnectionService service, SQLiteAxolotlStore store, Account account) {
123 super();
124 this.xmppConnectionService = service;
125 this.account = account;
126 this.fillMap(store);
127 }
128
129 private void putDevicesForJid(String bareJid, List<Integer> deviceIds, SQLiteAxolotlStore store) {
130 for (Integer deviceId : deviceIds) {
131 AxolotlAddress axolotlAddress = new AxolotlAddress(bareJid, deviceId);
132 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Building session for remote address: " + axolotlAddress.toString());
133 String fingerprint = store.loadSession(axolotlAddress).getSessionState().getRemoteIdentityKey().getFingerprint().replaceAll("\\s", "");
134 this.put(axolotlAddress, new XmppAxolotlSession(account, store, axolotlAddress, fingerprint));
135 }
136 }
137
138 private void fillMap(SQLiteAxolotlStore store) {
139 List<Integer> deviceIds = store.getSubDeviceSessions(account.getJid().toBareJid().toString());
140 putDevicesForJid(account.getJid().toBareJid().toString(), deviceIds, store);
141 for (Contact contact : account.getRoster().getContacts()) {
142 Jid bareJid = contact.getJid().toBareJid();
143 if (bareJid == null) {
144 continue; // FIXME: handle this?
145 }
146 String address = bareJid.toString();
147 deviceIds = store.getSubDeviceSessions(address);
148 putDevicesForJid(address, deviceIds, store);
149 }
150
151 }
152
153 @Override
154 public void put(AxolotlAddress address, XmppAxolotlSession value) {
155 super.put(address, value);
156 value.setNotFresh();
157 xmppConnectionService.syncRosterToDisk(account);
158 }
159
160 public void put(XmppAxolotlSession session) {
161 this.put(session.getRemoteAddress(), session);
162 }
163 }
164
165 private static enum FetchStatus {
166 PENDING,
167 SUCCESS,
168 ERROR
169 }
170
171 private static class FetchStatusMap extends AxolotlAddressMap<FetchStatus> {
172
173 }
174
175 public static String getLogprefix(Account account) {
176 return LOGPREFIX + " (" + account.getJid().toBareJid().toString() + "): ";
177 }
178
179 public AxolotlService(Account account, XmppConnectionService connectionService) {
180 if (Security.getProvider("BC") == null) {
181 Security.addProvider(new BouncyCastleProvider());
182 }
183 this.mXmppConnectionService = connectionService;
184 this.account = account;
185 this.axolotlStore = new SQLiteAxolotlStore(this.account, this.mXmppConnectionService);
186 this.deviceIds = new HashMap<>();
187 this.messageCache = new HashMap<>();
188 this.sessions = new SessionMap(mXmppConnectionService, axolotlStore, account);
189 this.fetchStatusMap = new FetchStatusMap();
190 this.executor = new SerialSingleThreadExecutor();
191 }
192
193 public IdentityKey getOwnPublicKey() {
194 return axolotlStore.getIdentityKeyPair().getPublicKey();
195 }
196
197 public Set<IdentityKey> getKeysWithTrust(XmppAxolotlSession.Trust trust) {
198 return axolotlStore.getContactKeysWithTrust(account.getJid().toBareJid().toString(), trust);
199 }
200
201 public Set<IdentityKey> getKeysWithTrust(XmppAxolotlSession.Trust trust, Contact contact) {
202 return axolotlStore.getContactKeysWithTrust(contact.getJid().toBareJid().toString(), trust);
203 }
204
205 public long getNumTrustedKeys(Contact contact) {
206 return axolotlStore.getContactNumTrustedKeys(contact.getJid().toBareJid().toString());
207 }
208
209 private AxolotlAddress getAddressForJid(Jid jid) {
210 return new AxolotlAddress(jid.toString(), 0);
211 }
212
213 private Set<XmppAxolotlSession> findOwnSessions() {
214 AxolotlAddress ownAddress = getAddressForJid(account.getJid().toBareJid());
215 Set<XmppAxolotlSession> ownDeviceSessions = new HashSet<>(this.sessions.getAll(ownAddress).values());
216 return ownDeviceSessions;
217 }
218
219 private Set<XmppAxolotlSession> findSessionsforContact(Contact contact) {
220 AxolotlAddress contactAddress = getAddressForJid(contact.getJid());
221 Set<XmppAxolotlSession> sessions = new HashSet<>(this.sessions.getAll(contactAddress).values());
222 return sessions;
223 }
224
225 private boolean hasAny(Contact contact) {
226 AxolotlAddress contactAddress = getAddressForJid(contact.getJid());
227 return sessions.hasAny(contactAddress);
228 }
229
230 public void regenerateKeys() {
231 axolotlStore.regenerate();
232 sessions.clear();
233 fetchStatusMap.clear();
234 publishBundlesIfNeeded();
235 publishOwnDeviceIdIfNeeded();
236 }
237
238 public int getOwnDeviceId() {
239 return axolotlStore.getLocalRegistrationId();
240 }
241
242 public Set<Integer> getOwnDeviceIds() {
243 return this.deviceIds.get(account.getJid().toBareJid());
244 }
245
246 private void setTrustOnSessions(final Jid jid, @NonNull final Set<Integer> deviceIds,
247 final XmppAxolotlSession.Trust from,
248 final XmppAxolotlSession.Trust to) {
249 for (Integer deviceId : deviceIds) {
250 AxolotlAddress address = new AxolotlAddress(jid.toBareJid().toString(), deviceId);
251 XmppAxolotlSession session = sessions.get(address);
252 if (session != null && session.getFingerprint() != null
253 && session.getTrust() == from) {
254 session.setTrust(to);
255 }
256 }
257 }
258
259 public void registerDevices(final Jid jid, @NonNull final Set<Integer> deviceIds) {
260 if (jid.toBareJid().equals(account.getJid().toBareJid())) {
261 if (!deviceIds.isEmpty()) {
262 Log.d(Config.LOGTAG, getLogprefix(account) + "Received non-empty own device list. Resetting publish attemps and pepBroken status.");
263 pepBroken = false;
264 numPublishTriesOnEmptyPep = 0;
265 }
266 if (deviceIds.contains(getOwnDeviceId())) {
267 deviceIds.remove(getOwnDeviceId());
268 } else {
269 publishOwnDeviceId(deviceIds);
270 }
271 for (Integer deviceId : deviceIds) {
272 AxolotlAddress ownDeviceAddress = new AxolotlAddress(jid.toBareJid().toString(), deviceId);
273 if (sessions.get(ownDeviceAddress) == null) {
274 buildSessionFromPEP(ownDeviceAddress);
275 }
276 }
277 }
278 Set<Integer> expiredDevices = new HashSet<>(axolotlStore.getSubDeviceSessions(jid.toBareJid().toString()));
279 expiredDevices.removeAll(deviceIds);
280 setTrustOnSessions(jid, expiredDevices, XmppAxolotlSession.Trust.TRUSTED,
281 XmppAxolotlSession.Trust.INACTIVE_TRUSTED);
282 setTrustOnSessions(jid, expiredDevices, XmppAxolotlSession.Trust.UNDECIDED,
283 XmppAxolotlSession.Trust.INACTIVE_UNDECIDED);
284 setTrustOnSessions(jid, expiredDevices, XmppAxolotlSession.Trust.UNTRUSTED,
285 XmppAxolotlSession.Trust.INACTIVE_UNTRUSTED);
286 Set<Integer> newDevices = new HashSet<>(deviceIds);
287 setTrustOnSessions(jid, newDevices, XmppAxolotlSession.Trust.INACTIVE_TRUSTED,
288 XmppAxolotlSession.Trust.TRUSTED);
289 setTrustOnSessions(jid, newDevices, XmppAxolotlSession.Trust.INACTIVE_UNDECIDED,
290 XmppAxolotlSession.Trust.UNDECIDED);
291 setTrustOnSessions(jid, newDevices, XmppAxolotlSession.Trust.INACTIVE_UNTRUSTED,
292 XmppAxolotlSession.Trust.UNTRUSTED);
293 this.deviceIds.put(jid, deviceIds);
294 mXmppConnectionService.keyStatusUpdated();
295 }
296
297 public void wipeOtherPepDevices() {
298 if (pepBroken) {
299 Log.d(Config.LOGTAG, getLogprefix(account) + "wipeOtherPepDevices called, but PEP is broken. Ignoring... ");
300 return;
301 }
302 Set<Integer> deviceIds = new HashSet<>();
303 deviceIds.add(getOwnDeviceId());
304 IqPacket publish = mXmppConnectionService.getIqGenerator().publishDeviceIds(deviceIds);
305 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Wiping all other devices from Pep:" + publish);
306 mXmppConnectionService.sendIqPacket(account, publish, new OnIqPacketReceived() {
307 @Override
308 public void onIqPacketReceived(Account account, IqPacket packet) {
309 // TODO: implement this!
310 }
311 });
312 }
313
314 public void purgeKey(IdentityKey identityKey) {
315 axolotlStore.setFingerprintTrust(identityKey.getFingerprint().replaceAll("\\s", ""), XmppAxolotlSession.Trust.COMPROMISED);
316 }
317
318 public void publishOwnDeviceIdIfNeeded() {
319 if (pepBroken) {
320 Log.d(Config.LOGTAG, getLogprefix(account) + "publishOwnDeviceIdIfNeeded called, but PEP is broken. Ignoring... ");
321 return;
322 }
323 IqPacket packet = mXmppConnectionService.getIqGenerator().retrieveDeviceIds(account.getJid().toBareJid());
324 mXmppConnectionService.sendIqPacket(account, packet, new OnIqPacketReceived() {
325 @Override
326 public void onIqPacketReceived(Account account, IqPacket packet) {
327 if (packet.getType() == IqPacket.TYPE.RESULT) {
328 Element item = mXmppConnectionService.getIqParser().getItem(packet);
329 Set<Integer> deviceIds = mXmppConnectionService.getIqParser().deviceIds(item);
330 if (!deviceIds.contains(getOwnDeviceId())) {
331 publishOwnDeviceId(deviceIds);
332 }
333 } else {
334 Log.d(Config.LOGTAG, getLogprefix(account) + "Error received while retrieving Device Ids" + packet.findChild("error"));
335 }
336 }
337 });
338 }
339
340 public void publishOwnDeviceId(Set<Integer> deviceIds) {
341 if (!deviceIds.contains(getOwnDeviceId())) {
342 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Own device " + getOwnDeviceId() + " not in PEP devicelist.");
343 if (deviceIds.isEmpty()) {
344 if (numPublishTriesOnEmptyPep >= publishTriesThreshold) {
345 Log.w(Config.LOGTAG, getLogprefix(account) + "Own device publish attempt threshold exceeded, aborting...");
346 pepBroken = true;
347 return;
348 } else {
349 numPublishTriesOnEmptyPep++;
350 Log.w(Config.LOGTAG, getLogprefix(account) + "Own device list empty, attempting to publish (try " + numPublishTriesOnEmptyPep + ")");
351 }
352 } else {
353 numPublishTriesOnEmptyPep = 0;
354 }
355 deviceIds.add(getOwnDeviceId());
356 IqPacket publish = mXmppConnectionService.getIqGenerator().publishDeviceIds(deviceIds);
357 mXmppConnectionService.sendIqPacket(account, publish, new OnIqPacketReceived() {
358 @Override
359 public void onIqPacketReceived(Account account, IqPacket packet) {
360 if (packet.getType() != IqPacket.TYPE.RESULT) {
361 Log.d(Config.LOGTAG, getLogprefix(account) + "Error received while publishing own device id" + packet.findChild("error"));
362 }
363 }
364 });
365 }
366 }
367
368 public void publishBundlesIfNeeded() {
369 if (pepBroken) {
370 Log.d(Config.LOGTAG, getLogprefix(account) + "publishBundlesIfNeeded called, but PEP is broken. Ignoring... ");
371 return;
372 }
373 IqPacket packet = mXmppConnectionService.getIqGenerator().retrieveBundlesForDevice(account.getJid().toBareJid(), getOwnDeviceId());
374 mXmppConnectionService.sendIqPacket(account, packet, new OnIqPacketReceived() {
375 @Override
376 public void onIqPacketReceived(Account account, IqPacket packet) {
377 PreKeyBundle bundle = mXmppConnectionService.getIqParser().bundle(packet);
378 Map<Integer, ECPublicKey> keys = mXmppConnectionService.getIqParser().preKeyPublics(packet);
379 boolean flush = false;
380 if (bundle == null) {
381 Log.w(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Received invalid bundle:" + packet);
382 bundle = new PreKeyBundle(-1, -1, -1, null, -1, null, null, null);
383 flush = true;
384 }
385 if (keys == null) {
386 Log.w(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Received invalid prekeys:" + packet);
387 }
388 try {
389 boolean changed = false;
390 // Validate IdentityKey
391 IdentityKeyPair identityKeyPair = axolotlStore.getIdentityKeyPair();
392 if (flush || !identityKeyPair.getPublicKey().equals(bundle.getIdentityKey())) {
393 Log.i(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Adding own IdentityKey " + identityKeyPair.getPublicKey() + " to PEP.");
394 changed = true;
395 }
396
397 // Validate signedPreKeyRecord + ID
398 SignedPreKeyRecord signedPreKeyRecord;
399 int numSignedPreKeys = axolotlStore.loadSignedPreKeys().size();
400 try {
401 signedPreKeyRecord = axolotlStore.loadSignedPreKey(bundle.getSignedPreKeyId());
402 if (flush
403 || !bundle.getSignedPreKey().equals(signedPreKeyRecord.getKeyPair().getPublicKey())
404 || !Arrays.equals(bundle.getSignedPreKeySignature(), signedPreKeyRecord.getSignature())) {
405 Log.i(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Adding new signedPreKey with ID " + (numSignedPreKeys + 1) + " to PEP.");
406 signedPreKeyRecord = KeyHelper.generateSignedPreKey(identityKeyPair, numSignedPreKeys + 1);
407 axolotlStore.storeSignedPreKey(signedPreKeyRecord.getId(), signedPreKeyRecord);
408 changed = true;
409 }
410 } catch (InvalidKeyIdException e) {
411 Log.i(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Adding new signedPreKey with ID " + (numSignedPreKeys + 1) + " to PEP.");
412 signedPreKeyRecord = KeyHelper.generateSignedPreKey(identityKeyPair, numSignedPreKeys + 1);
413 axolotlStore.storeSignedPreKey(signedPreKeyRecord.getId(), signedPreKeyRecord);
414 changed = true;
415 }
416
417 // Validate PreKeys
418 Set<PreKeyRecord> preKeyRecords = new HashSet<>();
419 if (keys != null) {
420 for (Integer id : keys.keySet()) {
421 try {
422 PreKeyRecord preKeyRecord = axolotlStore.loadPreKey(id);
423 if (preKeyRecord.getKeyPair().getPublicKey().equals(keys.get(id))) {
424 preKeyRecords.add(preKeyRecord);
425 }
426 } catch (InvalidKeyIdException ignored) {
427 }
428 }
429 }
430 int newKeys = NUM_KEYS_TO_PUBLISH - preKeyRecords.size();
431 if (newKeys > 0) {
432 List<PreKeyRecord> newRecords = KeyHelper.generatePreKeys(
433 axolotlStore.getCurrentPreKeyId() + 1, newKeys);
434 preKeyRecords.addAll(newRecords);
435 for (PreKeyRecord record : newRecords) {
436 axolotlStore.storePreKey(record.getId(), record);
437 }
438 changed = true;
439 Log.i(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Adding " + newKeys + " new preKeys to PEP.");
440 }
441
442
443 if (changed) {
444 IqPacket publish = mXmppConnectionService.getIqGenerator().publishBundles(
445 signedPreKeyRecord, axolotlStore.getIdentityKeyPair().getPublicKey(),
446 preKeyRecords, getOwnDeviceId());
447 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + ": Bundle " + getOwnDeviceId() + " in PEP not current. Publishing: " + publish);
448 mXmppConnectionService.sendIqPacket(account, publish, new OnIqPacketReceived() {
449 @Override
450 public void onIqPacketReceived(Account account, IqPacket packet) {
451 // TODO: implement this!
452 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Published bundle, got: " + packet);
453 }
454 });
455 }
456 } catch (InvalidKeyException e) {
457 Log.e(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Failed to publish bundle " + getOwnDeviceId() + ", reason: " + e.getMessage());
458 return;
459 }
460 }
461 });
462 }
463
464 public boolean isContactAxolotlCapable(Contact contact) {
465
466 Jid jid = contact.getJid().toBareJid();
467 AxolotlAddress address = new AxolotlAddress(jid.toString(), 0);
468 return sessions.hasAny(address) ||
469 (deviceIds.containsKey(jid) && !deviceIds.get(jid).isEmpty());
470 }
471
472 public XmppAxolotlSession.Trust getFingerprintTrust(String fingerprint) {
473 return axolotlStore.getFingerprintTrust(fingerprint);
474 }
475
476 public void setFingerprintTrust(String fingerprint, XmppAxolotlSession.Trust trust) {
477 axolotlStore.setFingerprintTrust(fingerprint, trust);
478 }
479
480 private void buildSessionFromPEP(final AxolotlAddress address) {
481 Log.i(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Building new sesstion for " + address.getDeviceId());
482
483 try {
484 IqPacket bundlesPacket = mXmppConnectionService.getIqGenerator().retrieveBundlesForDevice(
485 Jid.fromString(address.getName()), address.getDeviceId());
486 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Retrieving bundle: " + bundlesPacket);
487 mXmppConnectionService.sendIqPacket(account, bundlesPacket, new OnIqPacketReceived() {
488 private void finish() {
489 AxolotlAddress ownAddress = new AxolotlAddress(account.getJid().toBareJid().toString(), 0);
490 if (!fetchStatusMap.getAll(ownAddress).containsValue(FetchStatus.PENDING)
491 && !fetchStatusMap.getAll(address).containsValue(FetchStatus.PENDING)) {
492 mXmppConnectionService.keyStatusUpdated();
493 }
494 }
495
496 @Override
497 public void onIqPacketReceived(Account account, IqPacket packet) {
498 if (packet.getType() == IqPacket.TYPE.RESULT) {
499 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Received preKey IQ packet, processing...");
500 final IqParser parser = mXmppConnectionService.getIqParser();
501 final List<PreKeyBundle> preKeyBundleList = parser.preKeys(packet);
502 final PreKeyBundle bundle = parser.bundle(packet);
503 if (preKeyBundleList.isEmpty() || bundle == null) {
504 Log.e(Config.LOGTAG, AxolotlService.getLogprefix(account) + "preKey IQ packet invalid: " + packet);
505 fetchStatusMap.put(address, FetchStatus.ERROR);
506 finish();
507 return;
508 }
509 Random random = new Random();
510 final PreKeyBundle preKey = preKeyBundleList.get(random.nextInt(preKeyBundleList.size()));
511 if (preKey == null) {
512 //should never happen
513 fetchStatusMap.put(address, FetchStatus.ERROR);
514 finish();
515 return;
516 }
517
518 final PreKeyBundle preKeyBundle = new PreKeyBundle(0, address.getDeviceId(),
519 preKey.getPreKeyId(), preKey.getPreKey(),
520 bundle.getSignedPreKeyId(), bundle.getSignedPreKey(),
521 bundle.getSignedPreKeySignature(), bundle.getIdentityKey());
522
523 axolotlStore.saveIdentity(address.getName(), bundle.getIdentityKey());
524
525 try {
526 SessionBuilder builder = new SessionBuilder(axolotlStore, address);
527 builder.process(preKeyBundle);
528 XmppAxolotlSession session = new XmppAxolotlSession(account, axolotlStore, address, bundle.getIdentityKey().getFingerprint().replaceAll("\\s", ""));
529 sessions.put(address, session);
530 fetchStatusMap.put(address, FetchStatus.SUCCESS);
531 } catch (UntrustedIdentityException | InvalidKeyException e) {
532 Log.e(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Error building session for " + address + ": "
533 + e.getClass().getName() + ", " + e.getMessage());
534 fetchStatusMap.put(address, FetchStatus.ERROR);
535 }
536
537 finish();
538 } else {
539 fetchStatusMap.put(address, FetchStatus.ERROR);
540 Log.d(Config.LOGTAG, getLogprefix(account) + "Error received while building session:" + packet.findChild("error"));
541 finish();
542 return;
543 }
544 }
545 });
546 } catch (InvalidJidException e) {
547 Log.e(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Got address with invalid jid: " + address.getName());
548 }
549 }
550
551 public Set<AxolotlAddress> findDevicesWithoutSession(final Conversation conversation) {
552 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Finding devices without session for " + conversation.getContact().getJid().toBareJid());
553 Jid contactJid = conversation.getContact().getJid().toBareJid();
554 Set<AxolotlAddress> addresses = new HashSet<>();
555 if (deviceIds.get(contactJid) != null) {
556 for (Integer foreignId : this.deviceIds.get(contactJid)) {
557 AxolotlAddress address = new AxolotlAddress(contactJid.toString(), foreignId);
558 if (sessions.get(address) == null) {
559 IdentityKey identityKey = axolotlStore.loadSession(address).getSessionState().getRemoteIdentityKey();
560 if (identityKey != null) {
561 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Already have session for " + address.toString() + ", adding to cache...");
562 XmppAxolotlSession session = new XmppAxolotlSession(account, axolotlStore, address, identityKey.getFingerprint().replaceAll("\\s", ""));
563 sessions.put(address, session);
564 } else {
565 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Found device " + account.getJid().toBareJid() + ":" + foreignId);
566 addresses.add(new AxolotlAddress(contactJid.toString(), foreignId));
567 }
568 }
569 }
570 } else {
571 Log.w(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Have no target devices in PEP!");
572 }
573 if (deviceIds.get(account.getJid().toBareJid()) != null) {
574 for (Integer ownId : this.deviceIds.get(account.getJid().toBareJid())) {
575 AxolotlAddress address = new AxolotlAddress(account.getJid().toBareJid().toString(), ownId);
576 if (sessions.get(address) == null) {
577 IdentityKey identityKey = axolotlStore.loadSession(address).getSessionState().getRemoteIdentityKey();
578 if (identityKey != null) {
579 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Already have session for " + address.toString() + ", adding to cache...");
580 XmppAxolotlSession session = new XmppAxolotlSession(account, axolotlStore, address, identityKey.getFingerprint().replaceAll("\\s", ""));
581 sessions.put(address, session);
582 } else {
583 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Found device " + account.getJid().toBareJid() + ":" + ownId);
584 addresses.add(new AxolotlAddress(account.getJid().toBareJid().toString(), ownId));
585 }
586 }
587 }
588 }
589
590 return addresses;
591 }
592
593 public boolean createSessionsIfNeeded(final Conversation conversation) {
594 Log.i(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Creating axolotl sessions if needed...");
595 boolean newSessions = false;
596 Set<AxolotlAddress> addresses = findDevicesWithoutSession(conversation);
597 for (AxolotlAddress address : addresses) {
598 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Processing device: " + address.toString());
599 FetchStatus status = fetchStatusMap.get(address);
600 if (status == null || status == FetchStatus.ERROR) {
601 fetchStatusMap.put(address, FetchStatus.PENDING);
602 this.buildSessionFromPEP(address);
603 newSessions = true;
604 } else if (status == FetchStatus.PENDING) {
605 newSessions = true;
606 } else {
607 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Already fetching bundle for " + address.toString());
608 }
609 }
610
611 return newSessions;
612 }
613
614 public boolean hasPendingKeyFetches(Conversation conversation) {
615 AxolotlAddress ownAddress = new AxolotlAddress(account.getJid().toBareJid().toString(), 0);
616 AxolotlAddress foreignAddress = new AxolotlAddress(conversation.getJid().toBareJid().toString(), 0);
617 return fetchStatusMap.getAll(ownAddress).containsValue(FetchStatus.PENDING)
618 || fetchStatusMap.getAll(foreignAddress).containsValue(FetchStatus.PENDING);
619
620 }
621
622 @Nullable
623 private XmppAxolotlMessage buildHeader(Contact contact) {
624 final XmppAxolotlMessage axolotlMessage = new XmppAxolotlMessage(
625 contact.getJid().toBareJid(), getOwnDeviceId());
626
627 Set<XmppAxolotlSession> contactSessions = findSessionsforContact(contact);
628 Set<XmppAxolotlSession> ownSessions = findOwnSessions();
629 if (contactSessions.isEmpty()) {
630 return null;
631 }
632 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Building axolotl foreign keyElements...");
633 for (XmppAxolotlSession session : contactSessions) {
634 Log.v(Config.LOGTAG, AxolotlService.getLogprefix(account) + session.getRemoteAddress().toString());
635 axolotlMessage.addDevice(session);
636 }
637 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Building axolotl own keyElements...");
638 for (XmppAxolotlSession session : ownSessions) {
639 Log.v(Config.LOGTAG, AxolotlService.getLogprefix(account) + session.getRemoteAddress().toString());
640 axolotlMessage.addDevice(session);
641 }
642
643 return axolotlMessage;
644 }
645
646 @Nullable
647 public XmppAxolotlMessage encrypt(Message message) {
648 XmppAxolotlMessage axolotlMessage = buildHeader(message.getContact());
649
650 if (axolotlMessage != null) {
651 final String content;
652 if (message.hasFileOnRemoteHost()) {
653 content = message.getFileParams().url.toString();
654 } else {
655 content = message.getBody();
656 }
657 try {
658 axolotlMessage.encrypt(content);
659 } catch (CryptoFailedException e) {
660 Log.w(Config.LOGTAG, getLogprefix(account) + "Failed to encrypt message: " + e.getMessage());
661 return null;
662 }
663 }
664
665 return axolotlMessage;
666 }
667
668 public void preparePayloadMessage(final Message message, final boolean delay) {
669 executor.execute(new Runnable() {
670 @Override
671 public void run() {
672 XmppAxolotlMessage axolotlMessage = encrypt(message);
673 if (axolotlMessage == null) {
674 mXmppConnectionService.markMessage(message, Message.STATUS_SEND_FAILED);
675 //mXmppConnectionService.updateConversationUi();
676 } else {
677 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Generated message, caching: " + message.getUuid());
678 messageCache.put(message.getUuid(), axolotlMessage);
679 mXmppConnectionService.resendMessage(message, delay);
680 }
681 }
682 });
683 }
684
685 public void prepareKeyTransportMessage(final Contact contact, final OnMessageCreatedCallback onMessageCreatedCallback) {
686 executor.execute(new Runnable() {
687 @Override
688 public void run() {
689 XmppAxolotlMessage axolotlMessage = buildHeader(contact);
690 onMessageCreatedCallback.run(axolotlMessage);
691 }
692 });
693 }
694
695 public XmppAxolotlMessage fetchAxolotlMessageFromCache(Message message) {
696 XmppAxolotlMessage axolotlMessage = messageCache.get(message.getUuid());
697 if (axolotlMessage != null) {
698 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Cache hit: " + message.getUuid());
699 messageCache.remove(message.getUuid());
700 } else {
701 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Cache miss: " + message.getUuid());
702 }
703 return axolotlMessage;
704 }
705
706 private XmppAxolotlSession recreateUncachedSession(AxolotlAddress address) {
707 IdentityKey identityKey = axolotlStore.loadSession(address).getSessionState().getRemoteIdentityKey();
708 return (identityKey != null)
709 ? new XmppAxolotlSession(account, axolotlStore, address,
710 identityKey.getFingerprint().replaceAll("\\s", ""))
711 : null;
712 }
713
714 private XmppAxolotlSession getReceivingSession(XmppAxolotlMessage message) {
715 AxolotlAddress senderAddress = new AxolotlAddress(message.getFrom().toString(),
716 message.getSenderDeviceId());
717 XmppAxolotlSession session = sessions.get(senderAddress);
718 if (session == null) {
719 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Account: " + account.getJid() + " No axolotl session found while parsing received message " + message);
720 session = recreateUncachedSession(senderAddress);
721 if (session == null) {
722 session = new XmppAxolotlSession(account, axolotlStore, senderAddress);
723 }
724 }
725 return session;
726 }
727
728 public XmppAxolotlMessage.XmppAxolotlPlaintextMessage processReceivingPayloadMessage(XmppAxolotlMessage message) {
729 XmppAxolotlMessage.XmppAxolotlPlaintextMessage plaintextMessage = null;
730
731 XmppAxolotlSession session = getReceivingSession(message);
732 try {
733 plaintextMessage = message.decrypt(session, getOwnDeviceId());
734 Integer preKeyId = session.getPreKeyId();
735 if (preKeyId != null) {
736 publishBundlesIfNeeded();
737 session.resetPreKeyId();
738 }
739 } catch (CryptoFailedException e) {
740 Log.w(Config.LOGTAG, getLogprefix(account) + "Failed to decrypt message: " + e.getMessage());
741 }
742
743 if (session.isFresh() && plaintextMessage != null) {
744 sessions.put(session);
745 }
746
747 return plaintextMessage;
748 }
749
750 public XmppAxolotlMessage.XmppAxolotlKeyTransportMessage processReceivingKeyTransportMessage(XmppAxolotlMessage message) {
751 XmppAxolotlMessage.XmppAxolotlKeyTransportMessage keyTransportMessage = null;
752
753 XmppAxolotlSession session = getReceivingSession(message);
754 keyTransportMessage = message.getParameters(session, getOwnDeviceId());
755
756 if (session.isFresh() && keyTransportMessage != null) {
757 sessions.put(session);
758 }
759
760 return keyTransportMessage;
761 }
762}