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(true);
235 }
236
237 public int getOwnDeviceId() {
238 return axolotlStore.getLocalRegistrationId();
239 }
240
241 public Set<Integer> getOwnDeviceIds() {
242 return this.deviceIds.get(account.getJid().toBareJid());
243 }
244
245 private void setTrustOnSessions(final Jid jid, @NonNull final Set<Integer> deviceIds,
246 final XmppAxolotlSession.Trust from,
247 final XmppAxolotlSession.Trust to) {
248 for (Integer deviceId : deviceIds) {
249 AxolotlAddress address = new AxolotlAddress(jid.toBareJid().toString(), deviceId);
250 XmppAxolotlSession session = sessions.get(address);
251 if (session != null && session.getFingerprint() != null
252 && session.getTrust() == from) {
253 session.setTrust(to);
254 }
255 }
256 }
257
258 public void registerDevices(final Jid jid, @NonNull final Set<Integer> deviceIds) {
259 if (jid.toBareJid().equals(account.getJid().toBareJid())) {
260 if (!deviceIds.isEmpty()) {
261 Log.d(Config.LOGTAG, getLogprefix(account) + "Received non-empty own device list. Resetting publish attemps and pepBroken status.");
262 pepBroken = false;
263 numPublishTriesOnEmptyPep = 0;
264 }
265 if (deviceIds.contains(getOwnDeviceId())) {
266 deviceIds.remove(getOwnDeviceId());
267 } else {
268 publishOwnDeviceId(deviceIds);
269 }
270 for (Integer deviceId : deviceIds) {
271 AxolotlAddress ownDeviceAddress = new AxolotlAddress(jid.toBareJid().toString(), deviceId);
272 if (sessions.get(ownDeviceAddress) == null) {
273 buildSessionFromPEP(ownDeviceAddress);
274 }
275 }
276 }
277 Set<Integer> expiredDevices = new HashSet<>(axolotlStore.getSubDeviceSessions(jid.toBareJid().toString()));
278 expiredDevices.removeAll(deviceIds);
279 setTrustOnSessions(jid, expiredDevices, XmppAxolotlSession.Trust.TRUSTED,
280 XmppAxolotlSession.Trust.INACTIVE_TRUSTED);
281 setTrustOnSessions(jid, expiredDevices, XmppAxolotlSession.Trust.UNDECIDED,
282 XmppAxolotlSession.Trust.INACTIVE_UNDECIDED);
283 setTrustOnSessions(jid, expiredDevices, XmppAxolotlSession.Trust.UNTRUSTED,
284 XmppAxolotlSession.Trust.INACTIVE_UNTRUSTED);
285 Set<Integer> newDevices = new HashSet<>(deviceIds);
286 setTrustOnSessions(jid, newDevices, XmppAxolotlSession.Trust.INACTIVE_TRUSTED,
287 XmppAxolotlSession.Trust.TRUSTED);
288 setTrustOnSessions(jid, newDevices, XmppAxolotlSession.Trust.INACTIVE_UNDECIDED,
289 XmppAxolotlSession.Trust.UNDECIDED);
290 setTrustOnSessions(jid, newDevices, XmppAxolotlSession.Trust.INACTIVE_UNTRUSTED,
291 XmppAxolotlSession.Trust.UNTRUSTED);
292 this.deviceIds.put(jid, deviceIds);
293 mXmppConnectionService.keyStatusUpdated();
294 }
295
296 public void wipeOtherPepDevices() {
297 if (pepBroken) {
298 Log.d(Config.LOGTAG, getLogprefix(account) + "wipeOtherPepDevices called, but PEP is broken. Ignoring... ");
299 return;
300 }
301 Set<Integer> deviceIds = new HashSet<>();
302 deviceIds.add(getOwnDeviceId());
303 IqPacket publish = mXmppConnectionService.getIqGenerator().publishDeviceIds(deviceIds);
304 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Wiping all other devices from Pep:" + publish);
305 mXmppConnectionService.sendIqPacket(account, publish, new OnIqPacketReceived() {
306 @Override
307 public void onIqPacketReceived(Account account, IqPacket packet) {
308 // TODO: implement this!
309 }
310 });
311 }
312
313 public void purgeKey(IdentityKey identityKey) {
314 axolotlStore.setFingerprintTrust(identityKey.getFingerprint().replaceAll("\\s", ""), XmppAxolotlSession.Trust.COMPROMISED);
315 }
316
317 public void publishOwnDeviceIdIfNeeded() {
318 if (pepBroken) {
319 Log.d(Config.LOGTAG, getLogprefix(account) + "publishOwnDeviceIdIfNeeded called, but PEP is broken. Ignoring... ");
320 return;
321 }
322 IqPacket packet = mXmppConnectionService.getIqGenerator().retrieveDeviceIds(account.getJid().toBareJid());
323 mXmppConnectionService.sendIqPacket(account, packet, new OnIqPacketReceived() {
324 @Override
325 public void onIqPacketReceived(Account account, IqPacket packet) {
326 if (packet.getType() == IqPacket.TYPE.TIMEOUT) {
327 Log.d(Config.LOGTAG, getLogprefix(account) + "Timeout received while retrieving own Device Ids.");
328 } else {
329 Element item = mXmppConnectionService.getIqParser().getItem(packet);
330 Set<Integer> deviceIds = mXmppConnectionService.getIqParser().deviceIds(item);
331 if (!deviceIds.contains(getOwnDeviceId())) {
332 publishOwnDeviceId(deviceIds);
333 }
334 }
335 }
336 });
337 }
338
339 public void publishOwnDeviceId(Set<Integer> deviceIds) {
340 Set<Integer> deviceIdsCopy = new HashSet<>(deviceIds);
341 if (!deviceIdsCopy.contains(getOwnDeviceId())) {
342 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Own device " + getOwnDeviceId() + " not in PEP devicelist.");
343 if (deviceIdsCopy.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 deviceIdsCopy.add(getOwnDeviceId());
356 IqPacket publish = mXmppConnectionService.getIqGenerator().publishDeviceIds(deviceIdsCopy);
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(final boolean announceAfter) {
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 if (packet.getType() == IqPacket.TYPE.RESULT) {
452 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Successfully published bundle. ");
453 if (announceAfter) {
454 Log.d(Config.LOGTAG, getLogprefix(account) + "Announcing device " + getOwnDeviceId());
455 publishOwnDeviceIdIfNeeded();
456 }
457 } else {
458 Log.d(Config.LOGTAG, getLogprefix(account) + "Error received while publishing bundle: " + packet.findChild("error"));
459 }
460 }
461 });
462 } else {
463 Log.d(Config.LOGTAG, getLogprefix(account) + "Bundle " + getOwnDeviceId() + " in PEP was current");
464 if (announceAfter) {
465 Log.d(Config.LOGTAG, getLogprefix(account) + "Announcing device " + getOwnDeviceId());
466 publishOwnDeviceIdIfNeeded();
467 }
468 }
469 } catch (InvalidKeyException e) {
470 Log.e(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Failed to publish bundle " + getOwnDeviceId() + ", reason: " + e.getMessage());
471 return;
472 }
473 }
474 });
475 }
476
477 public boolean isContactAxolotlCapable(Contact contact) {
478
479 Jid jid = contact.getJid().toBareJid();
480 AxolotlAddress address = new AxolotlAddress(jid.toString(), 0);
481 return sessions.hasAny(address) ||
482 (deviceIds.containsKey(jid) && !deviceIds.get(jid).isEmpty());
483 }
484
485 public XmppAxolotlSession.Trust getFingerprintTrust(String fingerprint) {
486 return axolotlStore.getFingerprintTrust(fingerprint);
487 }
488
489 public void setFingerprintTrust(String fingerprint, XmppAxolotlSession.Trust trust) {
490 axolotlStore.setFingerprintTrust(fingerprint, trust);
491 }
492
493 private void buildSessionFromPEP(final AxolotlAddress address) {
494 Log.i(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Building new sesstion for " + address.toString());
495 if (address.getDeviceId() == getOwnDeviceId()) {
496 throw new AssertionError("We should NEVER build a session with ourselves. What happened here?!");
497 }
498
499 try {
500 IqPacket bundlesPacket = mXmppConnectionService.getIqGenerator().retrieveBundlesForDevice(
501 Jid.fromString(address.getName()), address.getDeviceId());
502 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Retrieving bundle: " + bundlesPacket);
503 mXmppConnectionService.sendIqPacket(account, bundlesPacket, new OnIqPacketReceived() {
504 private void finish() {
505 AxolotlAddress ownAddress = new AxolotlAddress(account.getJid().toBareJid().toString(), 0);
506 if (!fetchStatusMap.getAll(ownAddress).containsValue(FetchStatus.PENDING)
507 && !fetchStatusMap.getAll(address).containsValue(FetchStatus.PENDING)) {
508 mXmppConnectionService.keyStatusUpdated();
509 }
510 }
511
512 @Override
513 public void onIqPacketReceived(Account account, IqPacket packet) {
514 if (packet.getType() == IqPacket.TYPE.RESULT) {
515 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Received preKey IQ packet, processing...");
516 final IqParser parser = mXmppConnectionService.getIqParser();
517 final List<PreKeyBundle> preKeyBundleList = parser.preKeys(packet);
518 final PreKeyBundle bundle = parser.bundle(packet);
519 if (preKeyBundleList.isEmpty() || bundle == null) {
520 Log.e(Config.LOGTAG, AxolotlService.getLogprefix(account) + "preKey IQ packet invalid: " + packet);
521 fetchStatusMap.put(address, FetchStatus.ERROR);
522 finish();
523 return;
524 }
525 Random random = new Random();
526 final PreKeyBundle preKey = preKeyBundleList.get(random.nextInt(preKeyBundleList.size()));
527 if (preKey == null) {
528 //should never happen
529 fetchStatusMap.put(address, FetchStatus.ERROR);
530 finish();
531 return;
532 }
533
534 final PreKeyBundle preKeyBundle = new PreKeyBundle(0, address.getDeviceId(),
535 preKey.getPreKeyId(), preKey.getPreKey(),
536 bundle.getSignedPreKeyId(), bundle.getSignedPreKey(),
537 bundle.getSignedPreKeySignature(), bundle.getIdentityKey());
538
539 axolotlStore.saveIdentity(address.getName(), bundle.getIdentityKey());
540
541 try {
542 SessionBuilder builder = new SessionBuilder(axolotlStore, address);
543 builder.process(preKeyBundle);
544 XmppAxolotlSession session = new XmppAxolotlSession(account, axolotlStore, address, bundle.getIdentityKey().getFingerprint().replaceAll("\\s", ""));
545 sessions.put(address, session);
546 fetchStatusMap.put(address, FetchStatus.SUCCESS);
547 } catch (UntrustedIdentityException | InvalidKeyException e) {
548 Log.e(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Error building session for " + address + ": "
549 + e.getClass().getName() + ", " + e.getMessage());
550 fetchStatusMap.put(address, FetchStatus.ERROR);
551 }
552
553 finish();
554 } else {
555 fetchStatusMap.put(address, FetchStatus.ERROR);
556 Log.d(Config.LOGTAG, getLogprefix(account) + "Error received while building session:" + packet.findChild("error"));
557 finish();
558 return;
559 }
560 }
561 });
562 } catch (InvalidJidException e) {
563 Log.e(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Got address with invalid jid: " + address.getName());
564 }
565 }
566
567 public Set<AxolotlAddress> findDevicesWithoutSession(final Conversation conversation) {
568 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Finding devices without session for " + conversation.getContact().getJid().toBareJid());
569 Jid contactJid = conversation.getContact().getJid().toBareJid();
570 Set<AxolotlAddress> addresses = new HashSet<>();
571 if (deviceIds.get(contactJid) != null) {
572 for (Integer foreignId : this.deviceIds.get(contactJid)) {
573 AxolotlAddress address = new AxolotlAddress(contactJid.toString(), foreignId);
574 if (sessions.get(address) == null) {
575 IdentityKey identityKey = axolotlStore.loadSession(address).getSessionState().getRemoteIdentityKey();
576 if (identityKey != null) {
577 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Already have session for " + address.toString() + ", adding to cache...");
578 XmppAxolotlSession session = new XmppAxolotlSession(account, axolotlStore, address, identityKey.getFingerprint().replaceAll("\\s", ""));
579 sessions.put(address, session);
580 } else {
581 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Found device " + account.getJid().toBareJid() + ":" + foreignId);
582 addresses.add(new AxolotlAddress(contactJid.toString(), foreignId));
583 }
584 }
585 }
586 } else {
587 Log.w(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Have no target devices in PEP!");
588 }
589 if (deviceIds.get(account.getJid().toBareJid()) != null) {
590 for (Integer ownId : this.deviceIds.get(account.getJid().toBareJid())) {
591 AxolotlAddress address = new AxolotlAddress(account.getJid().toBareJid().toString(), ownId);
592 if (sessions.get(address) == null) {
593 IdentityKey identityKey = axolotlStore.loadSession(address).getSessionState().getRemoteIdentityKey();
594 if (identityKey != null) {
595 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Already have session for " + address.toString() + ", adding to cache...");
596 XmppAxolotlSession session = new XmppAxolotlSession(account, axolotlStore, address, identityKey.getFingerprint().replaceAll("\\s", ""));
597 sessions.put(address, session);
598 } else {
599 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Found device " + account.getJid().toBareJid() + ":" + ownId);
600 addresses.add(new AxolotlAddress(account.getJid().toBareJid().toString(), ownId));
601 }
602 }
603 }
604 }
605
606 return addresses;
607 }
608
609 public boolean createSessionsIfNeeded(final Conversation conversation) {
610 Log.i(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Creating axolotl sessions if needed...");
611 boolean newSessions = false;
612 Set<AxolotlAddress> addresses = findDevicesWithoutSession(conversation);
613 for (AxolotlAddress address : addresses) {
614 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Processing device: " + address.toString());
615 FetchStatus status = fetchStatusMap.get(address);
616 if (status == null || status == FetchStatus.ERROR) {
617 fetchStatusMap.put(address, FetchStatus.PENDING);
618 this.buildSessionFromPEP(address);
619 newSessions = true;
620 } else if (status == FetchStatus.PENDING) {
621 newSessions = true;
622 } else {
623 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Already fetching bundle for " + address.toString());
624 }
625 }
626
627 return newSessions;
628 }
629
630 public boolean hasPendingKeyFetches(Conversation conversation) {
631 AxolotlAddress ownAddress = new AxolotlAddress(account.getJid().toBareJid().toString(), 0);
632 AxolotlAddress foreignAddress = new AxolotlAddress(conversation.getJid().toBareJid().toString(), 0);
633 return fetchStatusMap.getAll(ownAddress).containsValue(FetchStatus.PENDING)
634 || fetchStatusMap.getAll(foreignAddress).containsValue(FetchStatus.PENDING);
635
636 }
637
638 @Nullable
639 private XmppAxolotlMessage buildHeader(Contact contact) {
640 final XmppAxolotlMessage axolotlMessage = new XmppAxolotlMessage(
641 contact.getJid().toBareJid(), getOwnDeviceId());
642
643 Set<XmppAxolotlSession> contactSessions = findSessionsforContact(contact);
644 Set<XmppAxolotlSession> ownSessions = findOwnSessions();
645 if (contactSessions.isEmpty()) {
646 return null;
647 }
648 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Building axolotl foreign keyElements...");
649 for (XmppAxolotlSession session : contactSessions) {
650 Log.v(Config.LOGTAG, AxolotlService.getLogprefix(account) + session.getRemoteAddress().toString());
651 axolotlMessage.addDevice(session);
652 }
653 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Building axolotl own keyElements...");
654 for (XmppAxolotlSession session : ownSessions) {
655 Log.v(Config.LOGTAG, AxolotlService.getLogprefix(account) + session.getRemoteAddress().toString());
656 axolotlMessage.addDevice(session);
657 }
658
659 return axolotlMessage;
660 }
661
662 @Nullable
663 public XmppAxolotlMessage encrypt(Message message) {
664 XmppAxolotlMessage axolotlMessage = buildHeader(message.getContact());
665
666 if (axolotlMessage != null) {
667 final String content;
668 if (message.hasFileOnRemoteHost()) {
669 content = message.getFileParams().url.toString();
670 } else {
671 content = message.getBody();
672 }
673 try {
674 axolotlMessage.encrypt(content);
675 } catch (CryptoFailedException e) {
676 Log.w(Config.LOGTAG, getLogprefix(account) + "Failed to encrypt message: " + e.getMessage());
677 return null;
678 }
679 }
680
681 return axolotlMessage;
682 }
683
684 public void preparePayloadMessage(final Message message, final boolean delay) {
685 executor.execute(new Runnable() {
686 @Override
687 public void run() {
688 XmppAxolotlMessage axolotlMessage = encrypt(message);
689 if (axolotlMessage == null) {
690 mXmppConnectionService.markMessage(message, Message.STATUS_SEND_FAILED);
691 //mXmppConnectionService.updateConversationUi();
692 } else {
693 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Generated message, caching: " + message.getUuid());
694 messageCache.put(message.getUuid(), axolotlMessage);
695 mXmppConnectionService.resendMessage(message, delay);
696 }
697 }
698 });
699 }
700
701 public void prepareKeyTransportMessage(final Contact contact, final OnMessageCreatedCallback onMessageCreatedCallback) {
702 executor.execute(new Runnable() {
703 @Override
704 public void run() {
705 XmppAxolotlMessage axolotlMessage = buildHeader(contact);
706 onMessageCreatedCallback.run(axolotlMessage);
707 }
708 });
709 }
710
711 public XmppAxolotlMessage fetchAxolotlMessageFromCache(Message message) {
712 XmppAxolotlMessage axolotlMessage = messageCache.get(message.getUuid());
713 if (axolotlMessage != null) {
714 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Cache hit: " + message.getUuid());
715 messageCache.remove(message.getUuid());
716 } else {
717 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Cache miss: " + message.getUuid());
718 }
719 return axolotlMessage;
720 }
721
722 private XmppAxolotlSession recreateUncachedSession(AxolotlAddress address) {
723 IdentityKey identityKey = axolotlStore.loadSession(address).getSessionState().getRemoteIdentityKey();
724 return (identityKey != null)
725 ? new XmppAxolotlSession(account, axolotlStore, address,
726 identityKey.getFingerprint().replaceAll("\\s", ""))
727 : null;
728 }
729
730 private XmppAxolotlSession getReceivingSession(XmppAxolotlMessage message) {
731 AxolotlAddress senderAddress = new AxolotlAddress(message.getFrom().toString(),
732 message.getSenderDeviceId());
733 XmppAxolotlSession session = sessions.get(senderAddress);
734 if (session == null) {
735 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Account: " + account.getJid() + " No axolotl session found while parsing received message " + message);
736 session = recreateUncachedSession(senderAddress);
737 if (session == null) {
738 session = new XmppAxolotlSession(account, axolotlStore, senderAddress);
739 }
740 }
741 return session;
742 }
743
744 public XmppAxolotlMessage.XmppAxolotlPlaintextMessage processReceivingPayloadMessage(XmppAxolotlMessage message) {
745 XmppAxolotlMessage.XmppAxolotlPlaintextMessage plaintextMessage = null;
746
747 XmppAxolotlSession session = getReceivingSession(message);
748 try {
749 plaintextMessage = message.decrypt(session, getOwnDeviceId());
750 Integer preKeyId = session.getPreKeyId();
751 if (preKeyId != null) {
752 publishBundlesIfNeeded(false);
753 session.resetPreKeyId();
754 }
755 } catch (CryptoFailedException e) {
756 Log.w(Config.LOGTAG, getLogprefix(account) + "Failed to decrypt message: " + e.getMessage());
757 }
758
759 if (session.isFresh() && plaintextMessage != null) {
760 sessions.put(session);
761 }
762
763 return plaintextMessage;
764 }
765
766 public XmppAxolotlMessage.XmppAxolotlKeyTransportMessage processReceivingKeyTransportMessage(XmppAxolotlMessage message) {
767 XmppAxolotlMessage.XmppAxolotlKeyTransportMessage keyTransportMessage = null;
768
769 XmppAxolotlSession session = getReceivingSession(message);
770 keyTransportMessage = message.getParameters(session, getOwnDeviceId());
771
772 if (session.isFresh() && keyTransportMessage != null) {
773 sessions.put(session);
774 }
775
776 return keyTransportMessage;
777 }
778}