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 = 10;
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 Element item = mXmppConnectionService.getIqParser().getItem(packet);
311 Set<Integer> deviceIds = mXmppConnectionService.getIqParser().deviceIds(item);
312 if (deviceIds == null) {
313 deviceIds = new HashSet<Integer>();
314 }
315 if (!deviceIds.contains(getOwnDeviceId())) {
316 deviceIds.add(getOwnDeviceId());
317 IqPacket publish = mXmppConnectionService.getIqGenerator().publishDeviceIds(deviceIds);
318 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Own device " + getOwnDeviceId() + " not in PEP devicelist. Publishing: " + publish);
319 mXmppConnectionService.sendIqPacket(account, publish, new OnIqPacketReceived() {
320 @Override
321 public void onIqPacketReceived(Account account, IqPacket packet) {
322 // TODO: implement this!
323 }
324 });
325 }
326 }
327 });
328 }
329
330 public void publishBundlesIfNeeded() {
331 IqPacket packet = mXmppConnectionService.getIqGenerator().retrieveBundlesForDevice(account.getJid().toBareJid(), getOwnDeviceId());
332 mXmppConnectionService.sendIqPacket(account, packet, new OnIqPacketReceived() {
333 @Override
334 public void onIqPacketReceived(Account account, IqPacket packet) {
335 PreKeyBundle bundle = mXmppConnectionService.getIqParser().bundle(packet);
336 Map<Integer, ECPublicKey> keys = mXmppConnectionService.getIqParser().preKeyPublics(packet);
337 boolean flush = false;
338 if (bundle == null) {
339 Log.w(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Received invalid bundle:" + packet);
340 bundle = new PreKeyBundle(-1, -1, -1, null, -1, null, null, null);
341 flush = true;
342 }
343 if (keys == null) {
344 Log.w(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Received invalid prekeys:" + packet);
345 }
346 try {
347 boolean changed = false;
348 // Validate IdentityKey
349 IdentityKeyPair identityKeyPair = axolotlStore.getIdentityKeyPair();
350 if (flush || !identityKeyPair.getPublicKey().equals(bundle.getIdentityKey())) {
351 Log.i(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Adding own IdentityKey " + identityKeyPair.getPublicKey() + " to PEP.");
352 changed = true;
353 }
354
355 // Validate signedPreKeyRecord + ID
356 SignedPreKeyRecord signedPreKeyRecord;
357 int numSignedPreKeys = axolotlStore.loadSignedPreKeys().size();
358 try {
359 signedPreKeyRecord = axolotlStore.loadSignedPreKey(bundle.getSignedPreKeyId());
360 if (flush
361 || !bundle.getSignedPreKey().equals(signedPreKeyRecord.getKeyPair().getPublicKey())
362 || !Arrays.equals(bundle.getSignedPreKeySignature(), signedPreKeyRecord.getSignature())) {
363 Log.i(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Adding new signedPreKey with ID " + (numSignedPreKeys + 1) + " to PEP.");
364 signedPreKeyRecord = KeyHelper.generateSignedPreKey(identityKeyPair, numSignedPreKeys + 1);
365 axolotlStore.storeSignedPreKey(signedPreKeyRecord.getId(), signedPreKeyRecord);
366 changed = true;
367 }
368 } catch (InvalidKeyIdException e) {
369 Log.i(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Adding new signedPreKey with ID " + (numSignedPreKeys + 1) + " to PEP.");
370 signedPreKeyRecord = KeyHelper.generateSignedPreKey(identityKeyPair, numSignedPreKeys + 1);
371 axolotlStore.storeSignedPreKey(signedPreKeyRecord.getId(), signedPreKeyRecord);
372 changed = true;
373 }
374
375 // Validate PreKeys
376 Set<PreKeyRecord> preKeyRecords = new HashSet<>();
377 if (keys != null) {
378 for (Integer id : keys.keySet()) {
379 try {
380 PreKeyRecord preKeyRecord = axolotlStore.loadPreKey(id);
381 if (preKeyRecord.getKeyPair().getPublicKey().equals(keys.get(id))) {
382 preKeyRecords.add(preKeyRecord);
383 }
384 } catch (InvalidKeyIdException ignored) {
385 }
386 }
387 }
388 int newKeys = NUM_KEYS_TO_PUBLISH - preKeyRecords.size();
389 if (newKeys > 0) {
390 List<PreKeyRecord> newRecords = KeyHelper.generatePreKeys(
391 axolotlStore.getCurrentPreKeyId() + 1, newKeys);
392 preKeyRecords.addAll(newRecords);
393 for (PreKeyRecord record : newRecords) {
394 axolotlStore.storePreKey(record.getId(), record);
395 }
396 changed = true;
397 Log.i(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Adding " + newKeys + " new preKeys to PEP.");
398 }
399
400
401 if (changed) {
402 IqPacket publish = mXmppConnectionService.getIqGenerator().publishBundles(
403 signedPreKeyRecord, axolotlStore.getIdentityKeyPair().getPublicKey(),
404 preKeyRecords, getOwnDeviceId());
405 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + ": Bundle " + getOwnDeviceId() + " in PEP not current. Publishing: " + publish);
406 mXmppConnectionService.sendIqPacket(account, publish, new OnIqPacketReceived() {
407 @Override
408 public void onIqPacketReceived(Account account, IqPacket packet) {
409 // TODO: implement this!
410 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Published bundle, got: " + packet);
411 }
412 });
413 }
414 } catch (InvalidKeyException e) {
415 Log.e(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Failed to publish bundle " + getOwnDeviceId() + ", reason: " + e.getMessage());
416 return;
417 }
418 }
419 });
420 }
421
422 public boolean isContactAxolotlCapable(Contact contact) {
423
424 Jid jid = contact.getJid().toBareJid();
425 AxolotlAddress address = new AxolotlAddress(jid.toString(), 0);
426 return sessions.hasAny(address) ||
427 (deviceIds.containsKey(jid) && !deviceIds.get(jid).isEmpty());
428 }
429
430 public XmppAxolotlSession.Trust getFingerprintTrust(String fingerprint) {
431 return axolotlStore.getFingerprintTrust(fingerprint);
432 }
433
434 public void setFingerprintTrust(String fingerprint, XmppAxolotlSession.Trust trust) {
435 axolotlStore.setFingerprintTrust(fingerprint, trust);
436 }
437
438 private void buildSessionFromPEP(final AxolotlAddress address) {
439 Log.i(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Building new sesstion for " + address.getDeviceId());
440
441 try {
442 IqPacket bundlesPacket = mXmppConnectionService.getIqGenerator().retrieveBundlesForDevice(
443 Jid.fromString(address.getName()), address.getDeviceId());
444 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Retrieving bundle: " + bundlesPacket);
445 mXmppConnectionService.sendIqPacket(account, bundlesPacket, new OnIqPacketReceived() {
446 private void finish() {
447 AxolotlAddress ownAddress = new AxolotlAddress(account.getJid().toBareJid().toString(), 0);
448 if (!fetchStatusMap.getAll(ownAddress).containsValue(FetchStatus.PENDING)
449 && !fetchStatusMap.getAll(address).containsValue(FetchStatus.PENDING)) {
450 mXmppConnectionService.keyStatusUpdated();
451 }
452 }
453
454 @Override
455 public void onIqPacketReceived(Account account, IqPacket packet) {
456 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Received preKey IQ packet, processing...");
457 final IqParser parser = mXmppConnectionService.getIqParser();
458 final List<PreKeyBundle> preKeyBundleList = parser.preKeys(packet);
459 final PreKeyBundle bundle = parser.bundle(packet);
460 if (preKeyBundleList.isEmpty() || bundle == null) {
461 Log.e(Config.LOGTAG, AxolotlService.getLogprefix(account) + "preKey IQ packet invalid: " + packet);
462 fetchStatusMap.put(address, FetchStatus.ERROR);
463 finish();
464 return;
465 }
466 Random random = new Random();
467 final PreKeyBundle preKey = preKeyBundleList.get(random.nextInt(preKeyBundleList.size()));
468 if (preKey == null) {
469 //should never happen
470 fetchStatusMap.put(address, FetchStatus.ERROR);
471 finish();
472 return;
473 }
474
475 final PreKeyBundle preKeyBundle = new PreKeyBundle(0, address.getDeviceId(),
476 preKey.getPreKeyId(), preKey.getPreKey(),
477 bundle.getSignedPreKeyId(), bundle.getSignedPreKey(),
478 bundle.getSignedPreKeySignature(), bundle.getIdentityKey());
479
480 axolotlStore.saveIdentity(address.getName(), bundle.getIdentityKey());
481
482 try {
483 SessionBuilder builder = new SessionBuilder(axolotlStore, address);
484 builder.process(preKeyBundle);
485 XmppAxolotlSession session = new XmppAxolotlSession(account, axolotlStore, address, bundle.getIdentityKey().getFingerprint().replaceAll("\\s", ""));
486 sessions.put(address, session);
487 fetchStatusMap.put(address, FetchStatus.SUCCESS);
488 } catch (UntrustedIdentityException | InvalidKeyException e) {
489 Log.e(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Error building session for " + address + ": "
490 + e.getClass().getName() + ", " + e.getMessage());
491 fetchStatusMap.put(address, FetchStatus.ERROR);
492 }
493
494 finish();
495 }
496 });
497 } catch (InvalidJidException e) {
498 Log.e(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Got address with invalid jid: " + address.getName());
499 }
500 }
501
502 public Set<AxolotlAddress> findDevicesWithoutSession(final Conversation conversation) {
503 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Finding devices without session for " + conversation.getContact().getJid().toBareJid());
504 Jid contactJid = conversation.getContact().getJid().toBareJid();
505 Set<AxolotlAddress> addresses = new HashSet<>();
506 if (deviceIds.get(contactJid) != null) {
507 for (Integer foreignId : this.deviceIds.get(contactJid)) {
508 AxolotlAddress address = new AxolotlAddress(contactJid.toString(), foreignId);
509 if (sessions.get(address) == null) {
510 IdentityKey identityKey = axolotlStore.loadSession(address).getSessionState().getRemoteIdentityKey();
511 if (identityKey != null) {
512 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Already have session for " + address.toString() + ", adding to cache...");
513 XmppAxolotlSession session = new XmppAxolotlSession(account, axolotlStore, address, identityKey.getFingerprint().replaceAll("\\s", ""));
514 sessions.put(address, session);
515 } else {
516 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Found device " + account.getJid().toBareJid() + ":" + foreignId);
517 addresses.add(new AxolotlAddress(contactJid.toString(), foreignId));
518 }
519 }
520 }
521 } else {
522 Log.w(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Have no target devices in PEP!");
523 }
524 if (deviceIds.get(account.getJid().toBareJid()) != null) {
525 for (Integer ownId : this.deviceIds.get(account.getJid().toBareJid())) {
526 AxolotlAddress address = new AxolotlAddress(account.getJid().toBareJid().toString(), ownId);
527 if (sessions.get(address) == null) {
528 IdentityKey identityKey = axolotlStore.loadSession(address).getSessionState().getRemoteIdentityKey();
529 if (identityKey != null) {
530 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Already have session for " + address.toString() + ", adding to cache...");
531 XmppAxolotlSession session = new XmppAxolotlSession(account, axolotlStore, address, identityKey.getFingerprint().replaceAll("\\s", ""));
532 sessions.put(address, session);
533 } else {
534 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Found device " + account.getJid().toBareJid() + ":" + ownId);
535 addresses.add(new AxolotlAddress(account.getJid().toBareJid().toString(), ownId));
536 }
537 }
538 }
539 }
540
541 return addresses;
542 }
543
544 public boolean createSessionsIfNeeded(final Conversation conversation) {
545 Log.i(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Creating axolotl sessions if needed...");
546 boolean newSessions = false;
547 Set<AxolotlAddress> addresses = findDevicesWithoutSession(conversation);
548 for (AxolotlAddress address : addresses) {
549 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Processing device: " + address.toString());
550 FetchStatus status = fetchStatusMap.get(address);
551 if (status == null || status == FetchStatus.ERROR) {
552 fetchStatusMap.put(address, FetchStatus.PENDING);
553 this.buildSessionFromPEP(address);
554 newSessions = true;
555 } else if (status == FetchStatus.PENDING) {
556 newSessions = true;
557 } else {
558 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Already fetching bundle for " + address.toString());
559 }
560 }
561
562 return newSessions;
563 }
564
565 public boolean hasPendingKeyFetches(Conversation conversation) {
566 AxolotlAddress ownAddress = new AxolotlAddress(account.getJid().toBareJid().toString(), 0);
567 AxolotlAddress foreignAddress = new AxolotlAddress(conversation.getJid().toBareJid().toString(), 0);
568 return fetchStatusMap.getAll(ownAddress).containsValue(FetchStatus.PENDING)
569 || fetchStatusMap.getAll(foreignAddress).containsValue(FetchStatus.PENDING);
570
571 }
572
573 @Nullable
574 private XmppAxolotlMessage buildHeader(Contact contact) {
575 final XmppAxolotlMessage axolotlMessage = new XmppAxolotlMessage(
576 contact.getJid().toBareJid(), getOwnDeviceId());
577
578 Set<XmppAxolotlSession> contactSessions = findSessionsforContact(contact);
579 Set<XmppAxolotlSession> ownSessions = findOwnSessions();
580 if (contactSessions.isEmpty()) {
581 return null;
582 }
583 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Building axolotl foreign keyElements...");
584 for (XmppAxolotlSession session : contactSessions) {
585 Log.v(Config.LOGTAG, AxolotlService.getLogprefix(account) + session.getRemoteAddress().toString());
586 axolotlMessage.addDevice(session);
587 }
588 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Building axolotl own keyElements...");
589 for (XmppAxolotlSession session : ownSessions) {
590 Log.v(Config.LOGTAG, AxolotlService.getLogprefix(account) + session.getRemoteAddress().toString());
591 axolotlMessage.addDevice(session);
592 }
593
594 return axolotlMessage;
595 }
596
597 @Nullable
598 public XmppAxolotlMessage encrypt(Message message) {
599 XmppAxolotlMessage axolotlMessage = buildHeader(message.getContact());
600
601 if (axolotlMessage != null) {
602 final String content;
603 if (message.hasFileOnRemoteHost()) {
604 content = message.getFileParams().url.toString();
605 } else {
606 content = message.getBody();
607 }
608 try {
609 axolotlMessage.encrypt(content);
610 } catch (CryptoFailedException e) {
611 Log.w(Config.LOGTAG, getLogprefix(account) + "Failed to encrypt message: " + e.getMessage());
612 return null;
613 }
614 }
615
616 return axolotlMessage;
617 }
618
619 public void preparePayloadMessage(final Message message, final boolean delay) {
620 executor.execute(new Runnable() {
621 @Override
622 public void run() {
623 XmppAxolotlMessage axolotlMessage = encrypt(message);
624 if (axolotlMessage == null) {
625 mXmppConnectionService.markMessage(message, Message.STATUS_SEND_FAILED);
626 //mXmppConnectionService.updateConversationUi();
627 } else {
628 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Generated message, caching: " + message.getUuid());
629 messageCache.put(message.getUuid(), axolotlMessage);
630 mXmppConnectionService.resendMessage(message, delay);
631 }
632 }
633 });
634 }
635
636 public void prepareKeyTransportMessage(final Contact contact, final OnMessageCreatedCallback onMessageCreatedCallback) {
637 executor.execute(new Runnable() {
638 @Override
639 public void run() {
640 XmppAxolotlMessage axolotlMessage = buildHeader(contact);
641 onMessageCreatedCallback.run(axolotlMessage);
642 }
643 });
644 }
645
646 public XmppAxolotlMessage fetchAxolotlMessageFromCache(Message message) {
647 XmppAxolotlMessage axolotlMessage = messageCache.get(message.getUuid());
648 if (axolotlMessage != null) {
649 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Cache hit: " + message.getUuid());
650 messageCache.remove(message.getUuid());
651 } else {
652 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Cache miss: " + message.getUuid());
653 }
654 return axolotlMessage;
655 }
656
657 private XmppAxolotlSession recreateUncachedSession(AxolotlAddress address) {
658 IdentityKey identityKey = axolotlStore.loadSession(address).getSessionState().getRemoteIdentityKey();
659 return (identityKey != null)
660 ? new XmppAxolotlSession(account, axolotlStore, address,
661 identityKey.getFingerprint().replaceAll("\\s", ""))
662 : null;
663 }
664
665 private XmppAxolotlSession getReceivingSession(XmppAxolotlMessage message) {
666 AxolotlAddress senderAddress = new AxolotlAddress(message.getFrom().toString(),
667 message.getSenderDeviceId());
668 XmppAxolotlSession session = sessions.get(senderAddress);
669 if (session == null) {
670 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Account: " + account.getJid() + " No axolotl session found while parsing received message " + message);
671 session = recreateUncachedSession(senderAddress);
672 if (session == null) {
673 session = new XmppAxolotlSession(account, axolotlStore, senderAddress);
674 }
675 }
676 return session;
677 }
678
679 public XmppAxolotlMessage.XmppAxolotlPlaintextMessage processReceivingPayloadMessage(XmppAxolotlMessage message) {
680 XmppAxolotlMessage.XmppAxolotlPlaintextMessage plaintextMessage = null;
681
682 XmppAxolotlSession session = getReceivingSession(message);
683 try {
684 plaintextMessage = message.decrypt(session, getOwnDeviceId());
685 Integer preKeyId = session.getPreKeyId();
686 if (preKeyId != null) {
687 publishBundlesIfNeeded();
688 session.resetPreKeyId();
689 }
690 } catch (CryptoFailedException e) {
691 Log.w(Config.LOGTAG, getLogprefix(account) + "Failed to decrypt message: " + e.getMessage());
692 }
693
694 if (session.isFresh() && plaintextMessage != null) {
695 sessions.put(session);
696 }
697
698 return plaintextMessage;
699 }
700
701 public XmppAxolotlMessage.XmppAxolotlKeyTransportMessage processReceivingKeyTransportMessage(XmppAxolotlMessage message) {
702 XmppAxolotlMessage.XmppAxolotlKeyTransportMessage keyTransportMessage = null;
703
704 XmppAxolotlSession session = getReceivingSession(message);
705 keyTransportMessage = message.getParameters(session, getOwnDeviceId());
706
707 if (session.isFresh() && keyTransportMessage != null) {
708 sessions.put(session);
709 }
710
711 return keyTransportMessage;
712 }
713}