1package eu.siacs.conversations.crypto.axolotl;
2
3import android.security.KeyChain;
4import android.support.annotation.NonNull;
5import android.support.annotation.Nullable;
6import android.util.Log;
7import android.util.Pair;
8
9import org.bouncycastle.jce.provider.BouncyCastleProvider;
10import org.whispersystems.libaxolotl.AxolotlAddress;
11import org.whispersystems.libaxolotl.IdentityKey;
12import org.whispersystems.libaxolotl.IdentityKeyPair;
13import org.whispersystems.libaxolotl.InvalidKeyException;
14import org.whispersystems.libaxolotl.InvalidKeyIdException;
15import org.whispersystems.libaxolotl.SessionBuilder;
16import org.whispersystems.libaxolotl.UntrustedIdentityException;
17import org.whispersystems.libaxolotl.ecc.ECPublicKey;
18import org.whispersystems.libaxolotl.state.PreKeyBundle;
19import org.whispersystems.libaxolotl.state.PreKeyRecord;
20import org.whispersystems.libaxolotl.state.SignedPreKeyRecord;
21import org.whispersystems.libaxolotl.util.KeyHelper;
22
23import java.security.PrivateKey;
24import java.security.Security;
25import java.security.Signature;
26import java.security.cert.X509Certificate;
27import java.util.Arrays;
28import java.util.HashMap;
29import java.util.HashSet;
30import java.util.List;
31import java.util.Map;
32import java.util.Random;
33import java.util.Set;
34
35import eu.siacs.conversations.Config;
36import eu.siacs.conversations.entities.Account;
37import eu.siacs.conversations.entities.Contact;
38import eu.siacs.conversations.entities.Conversation;
39import eu.siacs.conversations.entities.Message;
40import eu.siacs.conversations.parser.IqParser;
41import eu.siacs.conversations.services.XmppConnectionService;
42import eu.siacs.conversations.utils.SerialSingleThreadExecutor;
43import eu.siacs.conversations.xml.Element;
44import eu.siacs.conversations.xmpp.OnAdvancedStreamFeaturesLoaded;
45import eu.siacs.conversations.xmpp.OnIqPacketReceived;
46import eu.siacs.conversations.xmpp.jid.InvalidJidException;
47import eu.siacs.conversations.xmpp.jid.Jid;
48import eu.siacs.conversations.xmpp.stanzas.IqPacket;
49
50public class AxolotlService implements OnAdvancedStreamFeaturesLoaded {
51
52 public static final String PEP_PREFIX = "eu.siacs.conversations.axolotl";
53 public static final String PEP_DEVICE_LIST = PEP_PREFIX + ".devicelist";
54 public static final String PEP_BUNDLES = PEP_PREFIX + ".bundles";
55 public static final String PEP_VERIFICATION = PEP_PREFIX + ".verification";
56
57 public static final String LOGPREFIX = "AxolotlService";
58
59 public static final int NUM_KEYS_TO_PUBLISH = 100;
60 public static final int publishTriesThreshold = 3;
61
62 private final Account account;
63 private final XmppConnectionService mXmppConnectionService;
64 private final SQLiteAxolotlStore axolotlStore;
65 private final SessionMap sessions;
66 private final Map<Jid, Set<Integer>> deviceIds;
67 private final Map<String, XmppAxolotlMessage> messageCache;
68 private final FetchStatusMap fetchStatusMap;
69 private final SerialSingleThreadExecutor executor;
70 private int numPublishTriesOnEmptyPep = 0;
71 private boolean pepBroken = false;
72
73 @Override
74 public void onAdvancedStreamFeaturesAvailable(Account account) {
75 if (account.getXmppConnection().getFeatures().pep()) {
76 publishBundlesIfNeeded(true, false);
77 } else {
78 Log.d(Config.LOGTAG,account.getJid().toBareJid()+": skipping OMEMO initialization");
79 }
80 }
81
82 private static class AxolotlAddressMap<T> {
83 protected Map<String, Map<Integer, T>> map;
84 protected final Object MAP_LOCK = new Object();
85
86 public AxolotlAddressMap() {
87 this.map = new HashMap<>();
88 }
89
90 public void put(AxolotlAddress address, T value) {
91 synchronized (MAP_LOCK) {
92 Map<Integer, T> devices = map.get(address.getName());
93 if (devices == null) {
94 devices = new HashMap<>();
95 map.put(address.getName(), devices);
96 }
97 devices.put(address.getDeviceId(), value);
98 }
99 }
100
101 public T get(AxolotlAddress address) {
102 synchronized (MAP_LOCK) {
103 Map<Integer, T> devices = map.get(address.getName());
104 if (devices == null) {
105 return null;
106 }
107 return devices.get(address.getDeviceId());
108 }
109 }
110
111 public Map<Integer, T> getAll(AxolotlAddress address) {
112 synchronized (MAP_LOCK) {
113 Map<Integer, T> devices = map.get(address.getName());
114 if (devices == null) {
115 return new HashMap<>();
116 }
117 return devices;
118 }
119 }
120
121 public boolean hasAny(AxolotlAddress address) {
122 synchronized (MAP_LOCK) {
123 Map<Integer, T> devices = map.get(address.getName());
124 return devices != null && !devices.isEmpty();
125 }
126 }
127
128 public void clear() {
129 map.clear();
130 }
131
132 }
133
134 private static class SessionMap extends AxolotlAddressMap<XmppAxolotlSession> {
135 private final XmppConnectionService xmppConnectionService;
136 private final Account account;
137
138 public SessionMap(XmppConnectionService service, SQLiteAxolotlStore store, Account account) {
139 super();
140 this.xmppConnectionService = service;
141 this.account = account;
142 this.fillMap(store);
143 }
144
145 private void putDevicesForJid(String bareJid, List<Integer> deviceIds, SQLiteAxolotlStore store) {
146 for (Integer deviceId : deviceIds) {
147 AxolotlAddress axolotlAddress = new AxolotlAddress(bareJid, deviceId);
148 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Building session for remote address: " + axolotlAddress.toString());
149 String fingerprint = store.loadSession(axolotlAddress).getSessionState().getRemoteIdentityKey().getFingerprint().replaceAll("\\s", "");
150 this.put(axolotlAddress, new XmppAxolotlSession(account, store, axolotlAddress, fingerprint));
151 }
152 }
153
154 private void fillMap(SQLiteAxolotlStore store) {
155 List<Integer> deviceIds = store.getSubDeviceSessions(account.getJid().toBareJid().toString());
156 putDevicesForJid(account.getJid().toBareJid().toString(), deviceIds, store);
157 for (Contact contact : account.getRoster().getContacts()) {
158 Jid bareJid = contact.getJid().toBareJid();
159 String address = bareJid.toString();
160 deviceIds = store.getSubDeviceSessions(address);
161 putDevicesForJid(address, deviceIds, store);
162 }
163
164 }
165
166 @Override
167 public void put(AxolotlAddress address, XmppAxolotlSession value) {
168 super.put(address, value);
169 value.setNotFresh();
170 xmppConnectionService.syncRosterToDisk(account);
171 }
172
173 public void put(XmppAxolotlSession session) {
174 this.put(session.getRemoteAddress(), session);
175 }
176 }
177
178 public enum FetchStatus {
179 PENDING,
180 SUCCESS,
181 SUCCESS_VERIFIED,
182 ERROR
183 }
184
185 private static class FetchStatusMap extends AxolotlAddressMap<FetchStatus> {
186
187 }
188
189 public static String getLogprefix(Account account) {
190 return LOGPREFIX + " (" + account.getJid().toBareJid().toString() + "): ";
191 }
192
193 public AxolotlService(Account account, XmppConnectionService connectionService) {
194 if (Security.getProvider("BC") == null) {
195 Security.addProvider(new BouncyCastleProvider());
196 }
197 this.mXmppConnectionService = connectionService;
198 this.account = account;
199 this.axolotlStore = new SQLiteAxolotlStore(this.account, this.mXmppConnectionService);
200 this.deviceIds = new HashMap<>();
201 this.messageCache = new HashMap<>();
202 this.sessions = new SessionMap(mXmppConnectionService, axolotlStore, account);
203 this.fetchStatusMap = new FetchStatusMap();
204 this.executor = new SerialSingleThreadExecutor();
205 }
206
207 public String getOwnFingerprint() {
208 return axolotlStore.getIdentityKeyPair().getPublicKey().getFingerprint().replaceAll("\\s", "");
209 }
210
211 public Set<IdentityKey> getKeysWithTrust(XmppAxolotlSession.Trust trust) {
212 return axolotlStore.getContactKeysWithTrust(account.getJid().toBareJid().toString(), trust);
213 }
214
215 public Set<IdentityKey> getKeysWithTrust(XmppAxolotlSession.Trust trust, Contact contact) {
216 return axolotlStore.getContactKeysWithTrust(contact.getJid().toBareJid().toString(), trust);
217 }
218
219 public long getNumTrustedKeys(Contact contact) {
220 return axolotlStore.getContactNumTrustedKeys(contact.getJid().toBareJid().toString());
221 }
222
223 private AxolotlAddress getAddressForJid(Jid jid) {
224 return new AxolotlAddress(jid.toString(), 0);
225 }
226
227 private Set<XmppAxolotlSession> findOwnSessions() {
228 AxolotlAddress ownAddress = getAddressForJid(account.getJid().toBareJid());
229 return new HashSet<>(this.sessions.getAll(ownAddress).values());
230 }
231
232 private Set<XmppAxolotlSession> findSessionsforContact(Contact contact) {
233 AxolotlAddress contactAddress = getAddressForJid(contact.getJid());
234 return new HashSet<>(this.sessions.getAll(contactAddress).values());
235 }
236
237 public Set<String> getFingerprintsForOwnSessions() {
238 Set<String> fingerprints = new HashSet<>();
239 for (XmppAxolotlSession session : findOwnSessions()) {
240 fingerprints.add(session.getFingerprint());
241 }
242 return fingerprints;
243 }
244
245 public Set<String> getFingerprintsForContact(final Contact contact) {
246 Set<String> fingerprints = new HashSet<>();
247 for (XmppAxolotlSession session : findSessionsforContact(contact)) {
248 fingerprints.add(session.getFingerprint());
249 }
250 return fingerprints;
251 }
252
253 private boolean hasAny(Contact contact) {
254 AxolotlAddress contactAddress = getAddressForJid(contact.getJid());
255 return sessions.hasAny(contactAddress);
256 }
257
258 public boolean isPepBroken() {
259 return this.pepBroken;
260 }
261
262 public void regenerateKeys(boolean wipeOther) {
263 axolotlStore.regenerate();
264 sessions.clear();
265 fetchStatusMap.clear();
266 publishBundlesIfNeeded(true, wipeOther);
267 }
268
269 public int getOwnDeviceId() {
270 return axolotlStore.getLocalRegistrationId();
271 }
272
273 public Set<Integer> getOwnDeviceIds() {
274 return this.deviceIds.get(account.getJid().toBareJid());
275 }
276
277 private void setTrustOnSessions(final Jid jid, @NonNull final Set<Integer> deviceIds,
278 final XmppAxolotlSession.Trust from,
279 final XmppAxolotlSession.Trust to) {
280 for (Integer deviceId : deviceIds) {
281 AxolotlAddress address = new AxolotlAddress(jid.toBareJid().toString(), deviceId);
282 XmppAxolotlSession session = sessions.get(address);
283 if (session != null && session.getFingerprint() != null
284 && session.getTrust() == from) {
285 session.setTrust(to);
286 }
287 }
288 }
289
290 public void registerDevices(final Jid jid, @NonNull final Set<Integer> deviceIds) {
291 if (jid.toBareJid().equals(account.getJid().toBareJid())) {
292 if (!deviceIds.isEmpty()) {
293 Log.d(Config.LOGTAG, getLogprefix(account) + "Received non-empty own device list. Resetting publish attemps and pepBroken status.");
294 pepBroken = false;
295 numPublishTriesOnEmptyPep = 0;
296 }
297 if (deviceIds.contains(getOwnDeviceId())) {
298 deviceIds.remove(getOwnDeviceId());
299 } else {
300 publishOwnDeviceId(deviceIds);
301 }
302 for (Integer deviceId : deviceIds) {
303 AxolotlAddress ownDeviceAddress = new AxolotlAddress(jid.toBareJid().toString(), deviceId);
304 if (sessions.get(ownDeviceAddress) == null) {
305 buildSessionFromPEP(ownDeviceAddress);
306 }
307 }
308 }
309 Set<Integer> expiredDevices = new HashSet<>(axolotlStore.getSubDeviceSessions(jid.toBareJid().toString()));
310 expiredDevices.removeAll(deviceIds);
311 setTrustOnSessions(jid, expiredDevices, XmppAxolotlSession.Trust.TRUSTED,
312 XmppAxolotlSession.Trust.INACTIVE_TRUSTED);
313 setTrustOnSessions(jid, expiredDevices, XmppAxolotlSession.Trust.UNDECIDED,
314 XmppAxolotlSession.Trust.INACTIVE_UNDECIDED);
315 setTrustOnSessions(jid, expiredDevices, XmppAxolotlSession.Trust.UNTRUSTED,
316 XmppAxolotlSession.Trust.INACTIVE_UNTRUSTED);
317 Set<Integer> newDevices = new HashSet<>(deviceIds);
318 setTrustOnSessions(jid, newDevices, XmppAxolotlSession.Trust.INACTIVE_TRUSTED,
319 XmppAxolotlSession.Trust.TRUSTED);
320 setTrustOnSessions(jid, newDevices, XmppAxolotlSession.Trust.INACTIVE_UNDECIDED,
321 XmppAxolotlSession.Trust.UNDECIDED);
322 setTrustOnSessions(jid, newDevices, XmppAxolotlSession.Trust.INACTIVE_UNTRUSTED,
323 XmppAxolotlSession.Trust.UNTRUSTED);
324 this.deviceIds.put(jid, deviceIds);
325 findDevicesWithoutSession(jid);
326 mXmppConnectionService.keyStatusUpdated(null);
327 }
328
329 public void wipeOtherPepDevices() {
330 if (pepBroken) {
331 Log.d(Config.LOGTAG, getLogprefix(account) + "wipeOtherPepDevices called, but PEP is broken. Ignoring... ");
332 return;
333 }
334 Set<Integer> deviceIds = new HashSet<>();
335 deviceIds.add(getOwnDeviceId());
336 IqPacket publish = mXmppConnectionService.getIqGenerator().publishDeviceIds(deviceIds);
337 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Wiping all other devices from Pep:" + publish);
338 mXmppConnectionService.sendIqPacket(account, publish, new OnIqPacketReceived() {
339 @Override
340 public void onIqPacketReceived(Account account, IqPacket packet) {
341 // TODO: implement this!
342 }
343 });
344 }
345
346 public void purgeKey(final String fingerprint) {
347 axolotlStore.setFingerprintTrust(fingerprint.replaceAll("\\s", ""), XmppAxolotlSession.Trust.COMPROMISED);
348 }
349
350 public void publishOwnDeviceIdIfNeeded() {
351 if (pepBroken) {
352 Log.d(Config.LOGTAG, getLogprefix(account) + "publishOwnDeviceIdIfNeeded called, but PEP is broken. Ignoring... ");
353 return;
354 }
355 IqPacket packet = mXmppConnectionService.getIqGenerator().retrieveDeviceIds(account.getJid().toBareJid());
356 mXmppConnectionService.sendIqPacket(account, packet, new OnIqPacketReceived() {
357 @Override
358 public void onIqPacketReceived(Account account, IqPacket packet) {
359 if (packet.getType() == IqPacket.TYPE.TIMEOUT) {
360 Log.d(Config.LOGTAG, getLogprefix(account) + "Timeout received while retrieving own Device Ids.");
361 } else {
362 Element item = mXmppConnectionService.getIqParser().getItem(packet);
363 Set<Integer> deviceIds = mXmppConnectionService.getIqParser().deviceIds(item);
364 if (!deviceIds.contains(getOwnDeviceId())) {
365 publishOwnDeviceId(deviceIds);
366 }
367 }
368 }
369 });
370 }
371
372 public void publishOwnDeviceId(Set<Integer> deviceIds) {
373 Set<Integer> deviceIdsCopy = new HashSet<>(deviceIds);
374 if (!deviceIdsCopy.contains(getOwnDeviceId())) {
375 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Own device " + getOwnDeviceId() + " not in PEP devicelist.");
376 if (deviceIdsCopy.isEmpty()) {
377 if (numPublishTriesOnEmptyPep >= publishTriesThreshold) {
378 Log.w(Config.LOGTAG, getLogprefix(account) + "Own device publish attempt threshold exceeded, aborting...");
379 pepBroken = true;
380 return;
381 } else {
382 numPublishTriesOnEmptyPep++;
383 Log.w(Config.LOGTAG, getLogprefix(account) + "Own device list empty, attempting to publish (try " + numPublishTriesOnEmptyPep + ")");
384 }
385 } else {
386 numPublishTriesOnEmptyPep = 0;
387 }
388 deviceIdsCopy.add(getOwnDeviceId());
389 IqPacket publish = mXmppConnectionService.getIqGenerator().publishDeviceIds(deviceIdsCopy);
390 mXmppConnectionService.sendIqPacket(account, publish, new OnIqPacketReceived() {
391 @Override
392 public void onIqPacketReceived(Account account, IqPacket packet) {
393 if (packet.getType() != IqPacket.TYPE.RESULT) {
394 Log.d(Config.LOGTAG, getLogprefix(account) + "Error received while publishing own device id" + packet.findChild("error"));
395 }
396 }
397 });
398 }
399 }
400
401 public void publishDeviceVerificationAndBundle(final SignedPreKeyRecord signedPreKeyRecord,
402 final Set<PreKeyRecord> preKeyRecords,
403 final boolean announceAfter,
404 final boolean wipe) {
405 try {
406 IdentityKey axolotlPublicKey = axolotlStore.getIdentityKeyPair().getPublicKey();
407 PrivateKey x509PrivateKey = KeyChain.getPrivateKey(mXmppConnectionService, account.getPrivateKeyAlias());
408 X509Certificate[] chain = KeyChain.getCertificateChain(mXmppConnectionService, account.getPrivateKeyAlias());
409 Signature verifier = Signature.getInstance("sha256WithRSA");
410 verifier.initSign(x509PrivateKey,mXmppConnectionService.getRNG());
411 verifier.update(axolotlPublicKey.serialize());
412 byte[] signature = verifier.sign();
413 IqPacket packet = mXmppConnectionService.getIqGenerator().publishVerification(signature, chain, getOwnDeviceId());
414 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + ": publish verification for device "+getOwnDeviceId());
415 mXmppConnectionService.sendIqPacket(account, packet, new OnIqPacketReceived() {
416 @Override
417 public void onIqPacketReceived(Account account, IqPacket packet) {
418 publishDeviceBundle(signedPreKeyRecord, preKeyRecords, announceAfter, wipe);
419 }
420 });
421 } catch (Exception e) {
422 e.printStackTrace();
423 }
424 }
425
426 public void publishBundlesIfNeeded(final boolean announce, final boolean wipe) {
427 if (pepBroken) {
428 Log.d(Config.LOGTAG, getLogprefix(account) + "publishBundlesIfNeeded called, but PEP is broken. Ignoring... ");
429 return;
430 }
431 IqPacket packet = mXmppConnectionService.getIqGenerator().retrieveBundlesForDevice(account.getJid().toBareJid(), getOwnDeviceId());
432 mXmppConnectionService.sendIqPacket(account, packet, new OnIqPacketReceived() {
433 @Override
434 public void onIqPacketReceived(Account account, IqPacket packet) {
435
436 if (packet.getType() == IqPacket.TYPE.TIMEOUT) {
437 return; //ignore timeout. do nothing
438 }
439
440 if (packet.getType() == IqPacket.TYPE.ERROR) {
441 Element error = packet.findChild("error");
442 if (error == null || !error.hasChild("item-not-found")) {
443 pepBroken = true;
444 Log.w(Config.LOGTAG, AxolotlService.getLogprefix(account) + "request for device bundles came back with something other than item-not-found" + packet);
445 return;
446 }
447 }
448
449 PreKeyBundle bundle = mXmppConnectionService.getIqParser().bundle(packet);
450 Map<Integer, ECPublicKey> keys = mXmppConnectionService.getIqParser().preKeyPublics(packet);
451 boolean flush = false;
452 if (bundle == null) {
453 Log.w(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Received invalid bundle:" + packet);
454 bundle = new PreKeyBundle(-1, -1, -1, null, -1, null, null, null);
455 flush = true;
456 }
457 if (keys == null) {
458 Log.w(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Received invalid prekeys:" + packet);
459 }
460 try {
461 boolean changed = false;
462 // Validate IdentityKey
463 IdentityKeyPair identityKeyPair = axolotlStore.getIdentityKeyPair();
464 if (flush || !identityKeyPair.getPublicKey().equals(bundle.getIdentityKey())) {
465 Log.i(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Adding own IdentityKey " + identityKeyPair.getPublicKey() + " to PEP.");
466 changed = true;
467 }
468
469 // Validate signedPreKeyRecord + ID
470 SignedPreKeyRecord signedPreKeyRecord;
471 int numSignedPreKeys = axolotlStore.loadSignedPreKeys().size();
472 try {
473 signedPreKeyRecord = axolotlStore.loadSignedPreKey(bundle.getSignedPreKeyId());
474 if (flush
475 || !bundle.getSignedPreKey().equals(signedPreKeyRecord.getKeyPair().getPublicKey())
476 || !Arrays.equals(bundle.getSignedPreKeySignature(), signedPreKeyRecord.getSignature())) {
477 Log.i(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Adding new signedPreKey with ID " + (numSignedPreKeys + 1) + " to PEP.");
478 signedPreKeyRecord = KeyHelper.generateSignedPreKey(identityKeyPair, numSignedPreKeys + 1);
479 axolotlStore.storeSignedPreKey(signedPreKeyRecord.getId(), signedPreKeyRecord);
480 changed = true;
481 }
482 } catch (InvalidKeyIdException e) {
483 Log.i(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Adding new signedPreKey with ID " + (numSignedPreKeys + 1) + " to PEP.");
484 signedPreKeyRecord = KeyHelper.generateSignedPreKey(identityKeyPair, numSignedPreKeys + 1);
485 axolotlStore.storeSignedPreKey(signedPreKeyRecord.getId(), signedPreKeyRecord);
486 changed = true;
487 }
488
489 // Validate PreKeys
490 Set<PreKeyRecord> preKeyRecords = new HashSet<>();
491 if (keys != null) {
492 for (Integer id : keys.keySet()) {
493 try {
494 PreKeyRecord preKeyRecord = axolotlStore.loadPreKey(id);
495 if (preKeyRecord.getKeyPair().getPublicKey().equals(keys.get(id))) {
496 preKeyRecords.add(preKeyRecord);
497 }
498 } catch (InvalidKeyIdException ignored) {
499 }
500 }
501 }
502 int newKeys = NUM_KEYS_TO_PUBLISH - preKeyRecords.size();
503 if (newKeys > 0) {
504 List<PreKeyRecord> newRecords = KeyHelper.generatePreKeys(
505 axolotlStore.getCurrentPreKeyId() + 1, newKeys);
506 preKeyRecords.addAll(newRecords);
507 for (PreKeyRecord record : newRecords) {
508 axolotlStore.storePreKey(record.getId(), record);
509 }
510 changed = true;
511 Log.i(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Adding " + newKeys + " new preKeys to PEP.");
512 }
513
514
515 if (changed) {
516 if (account.getPrivateKeyAlias() != null && Config.X509_VERIFICATION) {
517 publishDeviceVerificationAndBundle(signedPreKeyRecord, preKeyRecords, announce, wipe);
518 } else {
519 publishDeviceBundle(signedPreKeyRecord, preKeyRecords, announce, wipe);
520 }
521 } else {
522 Log.d(Config.LOGTAG, getLogprefix(account) + "Bundle " + getOwnDeviceId() + " in PEP was current");
523 if (wipe) {
524 wipeOtherPepDevices();
525 } else if (announce) {
526 Log.d(Config.LOGTAG, getLogprefix(account) + "Announcing device " + getOwnDeviceId());
527 publishOwnDeviceIdIfNeeded();
528 }
529 }
530 } catch (InvalidKeyException e) {
531 Log.e(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Failed to publish bundle " + getOwnDeviceId() + ", reason: " + e.getMessage());
532 }
533 }
534 });
535 }
536
537 private void publishDeviceBundle(SignedPreKeyRecord signedPreKeyRecord,
538 Set<PreKeyRecord> preKeyRecords,
539 final boolean announceAfter,
540 final boolean wipe) {
541 IqPacket publish = mXmppConnectionService.getIqGenerator().publishBundles(
542 signedPreKeyRecord, axolotlStore.getIdentityKeyPair().getPublicKey(),
543 preKeyRecords, getOwnDeviceId());
544 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + ": Bundle " + getOwnDeviceId() + " in PEP not current. Publishing: " + publish);
545 mXmppConnectionService.sendIqPacket(account, publish, new OnIqPacketReceived() {
546 @Override
547 public void onIqPacketReceived(Account account, IqPacket packet) {
548 if (packet.getType() == IqPacket.TYPE.RESULT) {
549 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Successfully published bundle. ");
550 if (wipe) {
551 wipeOtherPepDevices();
552 } else if (announceAfter) {
553 Log.d(Config.LOGTAG, getLogprefix(account) + "Announcing device " + getOwnDeviceId());
554 publishOwnDeviceIdIfNeeded();
555 }
556 } else {
557 Log.d(Config.LOGTAG, getLogprefix(account) + "Error received while publishing bundle: " + packet.findChild("error"));
558 }
559 }
560 });
561 }
562
563 public boolean isContactAxolotlCapable(Contact contact) {
564 Jid jid = contact.getJid().toBareJid();
565 return hasAny(contact) ||
566 (deviceIds.containsKey(jid) && !deviceIds.get(jid).isEmpty());
567 }
568
569 public XmppAxolotlSession.Trust getFingerprintTrust(String fingerprint) {
570 return axolotlStore.getFingerprintTrust(fingerprint);
571 }
572
573 public void setFingerprintTrust(String fingerprint, XmppAxolotlSession.Trust trust) {
574 axolotlStore.setFingerprintTrust(fingerprint, trust);
575 }
576
577 private void verifySessionWithPEP(final XmppAxolotlSession session, final IdentityKey identityKey) {
578 final AxolotlAddress address = session.getRemoteAddress();
579 try {
580 IqPacket packet = mXmppConnectionService.getIqGenerator().retrieveVerificationForDevice(Jid.fromString(address.getName()), address.getDeviceId());
581 mXmppConnectionService.sendIqPacket(account, packet, new OnIqPacketReceived() {
582 @Override
583 public void onIqPacketReceived(Account account, IqPacket packet) {
584 Pair<X509Certificate[],byte[]> verification = mXmppConnectionService.getIqParser().verification(packet);
585 if (verification != null) {
586 try {
587 Signature verifier = Signature.getInstance("sha256WithRSA");
588 verifier.initVerify(verification.first[0]);
589 verifier.update(identityKey.serialize());
590 if (verifier.verify(verification.second)) {
591 try {
592 mXmppConnectionService.getMemorizingTrustManager().getNonInteractive().checkClientTrusted(verification.first, "RSA");
593 Log.d(Config.LOGTAG, "verified session with x.509 signature. fingerprint was: "+session.getFingerprint());
594 setFingerprintTrust(session.getFingerprint(), XmppAxolotlSession.Trust.TRUSTED);
595 fetchStatusMap.put(address, FetchStatus.SUCCESS_VERIFIED);
596 finishBuildingSessionsFromPEP(address);
597 return;
598 } catch (Exception e) {
599 Log.d(Config.LOGTAG,"could not verify certificate");
600 }
601 }
602 } catch (Exception e) {
603 Log.d(Config.LOGTAG, "error during verification " + e.getMessage());
604 }
605 }
606 fetchStatusMap.put(address, FetchStatus.SUCCESS);
607 finishBuildingSessionsFromPEP(address);
608 }
609 });
610 } catch (InvalidJidException e) {
611 fetchStatusMap.put(address, FetchStatus.SUCCESS);
612 finishBuildingSessionsFromPEP(address);
613 }
614 }
615
616 private void finishBuildingSessionsFromPEP(final AxolotlAddress address) {
617 AxolotlAddress ownAddress = new AxolotlAddress(account.getJid().toBareJid().toString(), 0);
618 if (!fetchStatusMap.getAll(ownAddress).containsValue(FetchStatus.PENDING)
619 && !fetchStatusMap.getAll(address).containsValue(FetchStatus.PENDING)) {
620 FetchStatus report = null;
621 if (fetchStatusMap.getAll(ownAddress).containsValue(FetchStatus.SUCCESS_VERIFIED)
622 | fetchStatusMap.getAll(address).containsValue(FetchStatus.SUCCESS_VERIFIED)) {
623 report = FetchStatus.SUCCESS_VERIFIED;
624 } else if (fetchStatusMap.getAll(ownAddress).containsValue(FetchStatus.ERROR)
625 || fetchStatusMap.getAll(address).containsValue(FetchStatus.ERROR)) {
626 report = FetchStatus.ERROR;
627 }
628 mXmppConnectionService.keyStatusUpdated(report);
629 }
630 }
631
632 private void buildSessionFromPEP(final AxolotlAddress address) {
633 Log.i(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Building new sesstion for " + address.toString());
634 if (address.getDeviceId() == getOwnDeviceId()) {
635 throw new AssertionError("We should NEVER build a session with ourselves. What happened here?!");
636 }
637
638 try {
639 IqPacket bundlesPacket = mXmppConnectionService.getIqGenerator().retrieveBundlesForDevice(
640 Jid.fromString(address.getName()), address.getDeviceId());
641 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Retrieving bundle: " + bundlesPacket);
642 mXmppConnectionService.sendIqPacket(account, bundlesPacket, new OnIqPacketReceived() {
643
644 @Override
645 public void onIqPacketReceived(Account account, IqPacket packet) {
646 if (packet.getType() == IqPacket.TYPE.RESULT) {
647 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Received preKey IQ packet, processing...");
648 final IqParser parser = mXmppConnectionService.getIqParser();
649 final List<PreKeyBundle> preKeyBundleList = parser.preKeys(packet);
650 final PreKeyBundle bundle = parser.bundle(packet);
651 if (preKeyBundleList.isEmpty() || bundle == null) {
652 Log.e(Config.LOGTAG, AxolotlService.getLogprefix(account) + "preKey IQ packet invalid: " + packet);
653 fetchStatusMap.put(address, FetchStatus.ERROR);
654 finishBuildingSessionsFromPEP(address);
655 return;
656 }
657 Random random = new Random();
658 final PreKeyBundle preKey = preKeyBundleList.get(random.nextInt(preKeyBundleList.size()));
659 if (preKey == null) {
660 //should never happen
661 fetchStatusMap.put(address, FetchStatus.ERROR);
662 finishBuildingSessionsFromPEP(address);
663 return;
664 }
665
666 final PreKeyBundle preKeyBundle = new PreKeyBundle(0, address.getDeviceId(),
667 preKey.getPreKeyId(), preKey.getPreKey(),
668 bundle.getSignedPreKeyId(), bundle.getSignedPreKey(),
669 bundle.getSignedPreKeySignature(), bundle.getIdentityKey());
670
671 try {
672 SessionBuilder builder = new SessionBuilder(axolotlStore, address);
673 builder.process(preKeyBundle);
674 XmppAxolotlSession session = new XmppAxolotlSession(account, axolotlStore, address, bundle.getIdentityKey().getFingerprint().replaceAll("\\s", ""));
675 sessions.put(address, session);
676 if (Config.X509_VERIFICATION) {
677 verifySessionWithPEP(session, bundle.getIdentityKey());
678 } else {
679 fetchStatusMap.put(address, FetchStatus.SUCCESS);
680 finishBuildingSessionsFromPEP(address);
681 }
682 } catch (UntrustedIdentityException | InvalidKeyException e) {
683 Log.e(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Error building session for " + address + ": "
684 + e.getClass().getName() + ", " + e.getMessage());
685 fetchStatusMap.put(address, FetchStatus.ERROR);
686 finishBuildingSessionsFromPEP(address);
687 }
688 } else {
689 fetchStatusMap.put(address, FetchStatus.ERROR);
690 Log.d(Config.LOGTAG, getLogprefix(account) + "Error received while building session:" + packet.findChild("error"));
691 finishBuildingSessionsFromPEP(address);
692 }
693 }
694 });
695 } catch (InvalidJidException e) {
696 Log.e(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Got address with invalid jid: " + address.getName());
697 }
698 }
699
700 public Set<AxolotlAddress> findDevicesWithoutSession(final Conversation conversation) {
701 return findDevicesWithoutSession(conversation.getContact().getJid().toBareJid());
702 }
703
704 public Set<AxolotlAddress> findDevicesWithoutSession(final Jid contactJid) {
705 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Finding devices without session for " + contactJid);
706 Set<AxolotlAddress> addresses = new HashSet<>();
707 if (deviceIds.get(contactJid) != null) {
708 for (Integer foreignId : this.deviceIds.get(contactJid)) {
709 AxolotlAddress address = new AxolotlAddress(contactJid.toString(), foreignId);
710 if (sessions.get(address) == null) {
711 IdentityKey identityKey = axolotlStore.loadSession(address).getSessionState().getRemoteIdentityKey();
712 if (identityKey != null) {
713 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Already have session for " + address.toString() + ", adding to cache...");
714 XmppAxolotlSession session = new XmppAxolotlSession(account, axolotlStore, address, identityKey.getFingerprint().replaceAll("\\s", ""));
715 sessions.put(address, session);
716 } else {
717 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Found device " + account.getJid().toBareJid() + ":" + foreignId);
718 addresses.add(new AxolotlAddress(contactJid.toString(), foreignId));
719 }
720 }
721 }
722 } else {
723 Log.w(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Have no target devices in PEP!");
724 }
725 if (deviceIds.get(account.getJid().toBareJid()) != null) {
726 for (Integer ownId : this.deviceIds.get(account.getJid().toBareJid())) {
727 AxolotlAddress address = new AxolotlAddress(account.getJid().toBareJid().toString(), ownId);
728 if (sessions.get(address) == null) {
729 IdentityKey identityKey = axolotlStore.loadSession(address).getSessionState().getRemoteIdentityKey();
730 if (identityKey != null) {
731 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Already have session for " + address.toString() + ", adding to cache...");
732 XmppAxolotlSession session = new XmppAxolotlSession(account, axolotlStore, address, identityKey.getFingerprint().replaceAll("\\s", ""));
733 sessions.put(address, session);
734 } else {
735 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Found device " + account.getJid().toBareJid() + ":" + ownId);
736 addresses.add(new AxolotlAddress(account.getJid().toBareJid().toString(), ownId));
737 }
738 }
739 }
740 }
741
742 return addresses;
743 }
744
745 public boolean createSessionsIfNeeded(final Conversation conversation) {
746 Log.i(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Creating axolotl sessions if needed...");
747 boolean newSessions = false;
748 Set<AxolotlAddress> addresses = findDevicesWithoutSession(conversation);
749 for (AxolotlAddress address : addresses) {
750 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Processing device: " + address.toString());
751 FetchStatus status = fetchStatusMap.get(address);
752 if (status == null || status == FetchStatus.ERROR) {
753 fetchStatusMap.put(address, FetchStatus.PENDING);
754 this.buildSessionFromPEP(address);
755 newSessions = true;
756 } else if (status == FetchStatus.PENDING) {
757 newSessions = true;
758 } else {
759 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Already fetching bundle for " + address.toString());
760 }
761 }
762
763 return newSessions;
764 }
765
766 public boolean hasPendingKeyFetches(Account account, Contact contact) {
767 AxolotlAddress ownAddress = new AxolotlAddress(account.getJid().toBareJid().toString(), 0);
768 AxolotlAddress foreignAddress = new AxolotlAddress(contact.getJid().toBareJid().toString(), 0);
769 return fetchStatusMap.getAll(ownAddress).containsValue(FetchStatus.PENDING)
770 || fetchStatusMap.getAll(foreignAddress).containsValue(FetchStatus.PENDING);
771
772 }
773
774 @Nullable
775 private XmppAxolotlMessage buildHeader(Contact contact) {
776 final XmppAxolotlMessage axolotlMessage = new XmppAxolotlMessage(
777 contact.getJid().toBareJid(), getOwnDeviceId());
778
779 Set<XmppAxolotlSession> contactSessions = findSessionsforContact(contact);
780 Set<XmppAxolotlSession> ownSessions = findOwnSessions();
781 if (contactSessions.isEmpty()) {
782 return null;
783 }
784 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Building axolotl foreign keyElements...");
785 for (XmppAxolotlSession session : contactSessions) {
786 Log.v(Config.LOGTAG, AxolotlService.getLogprefix(account) + session.getRemoteAddress().toString());
787 axolotlMessage.addDevice(session);
788 }
789 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Building axolotl own keyElements...");
790 for (XmppAxolotlSession session : ownSessions) {
791 Log.v(Config.LOGTAG, AxolotlService.getLogprefix(account) + session.getRemoteAddress().toString());
792 axolotlMessage.addDevice(session);
793 }
794
795 return axolotlMessage;
796 }
797
798 @Nullable
799 public XmppAxolotlMessage encrypt(Message message) {
800 XmppAxolotlMessage axolotlMessage = buildHeader(message.getContact());
801
802 if (axolotlMessage != null) {
803 final String content;
804 if (message.hasFileOnRemoteHost()) {
805 content = message.getFileParams().url.toString();
806 } else {
807 content = message.getBody();
808 }
809 try {
810 axolotlMessage.encrypt(content);
811 } catch (CryptoFailedException e) {
812 Log.w(Config.LOGTAG, getLogprefix(account) + "Failed to encrypt message: " + e.getMessage());
813 return null;
814 }
815 }
816
817 return axolotlMessage;
818 }
819
820 public void preparePayloadMessage(final Message message, final boolean delay) {
821 executor.execute(new Runnable() {
822 @Override
823 public void run() {
824 XmppAxolotlMessage axolotlMessage = encrypt(message);
825 if (axolotlMessage == null) {
826 mXmppConnectionService.markMessage(message, Message.STATUS_SEND_FAILED);
827 //mXmppConnectionService.updateConversationUi();
828 } else {
829 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Generated message, caching: " + message.getUuid());
830 messageCache.put(message.getUuid(), axolotlMessage);
831 mXmppConnectionService.resendMessage(message, delay);
832 }
833 }
834 });
835 }
836
837 public void prepareKeyTransportMessage(final Contact contact, final OnMessageCreatedCallback onMessageCreatedCallback) {
838 executor.execute(new Runnable() {
839 @Override
840 public void run() {
841 XmppAxolotlMessage axolotlMessage = buildHeader(contact);
842 onMessageCreatedCallback.run(axolotlMessage);
843 }
844 });
845 }
846
847 public XmppAxolotlMessage fetchAxolotlMessageFromCache(Message message) {
848 XmppAxolotlMessage axolotlMessage = messageCache.get(message.getUuid());
849 if (axolotlMessage != null) {
850 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Cache hit: " + message.getUuid());
851 messageCache.remove(message.getUuid());
852 } else {
853 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Cache miss: " + message.getUuid());
854 }
855 return axolotlMessage;
856 }
857
858 private XmppAxolotlSession recreateUncachedSession(AxolotlAddress address) {
859 IdentityKey identityKey = axolotlStore.loadSession(address).getSessionState().getRemoteIdentityKey();
860 return (identityKey != null)
861 ? new XmppAxolotlSession(account, axolotlStore, address,
862 identityKey.getFingerprint().replaceAll("\\s", ""))
863 : null;
864 }
865
866 private XmppAxolotlSession getReceivingSession(XmppAxolotlMessage message) {
867 AxolotlAddress senderAddress = new AxolotlAddress(message.getFrom().toString(),
868 message.getSenderDeviceId());
869 XmppAxolotlSession session = sessions.get(senderAddress);
870 if (session == null) {
871 Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Account: " + account.getJid() + " No axolotl session found while parsing received message " + message);
872 session = recreateUncachedSession(senderAddress);
873 if (session == null) {
874 session = new XmppAxolotlSession(account, axolotlStore, senderAddress);
875 }
876 }
877 return session;
878 }
879
880 public XmppAxolotlMessage.XmppAxolotlPlaintextMessage processReceivingPayloadMessage(XmppAxolotlMessage message) {
881 XmppAxolotlMessage.XmppAxolotlPlaintextMessage plaintextMessage = null;
882
883 XmppAxolotlSession session = getReceivingSession(message);
884 try {
885 plaintextMessage = message.decrypt(session, getOwnDeviceId());
886 Integer preKeyId = session.getPreKeyId();
887 if (preKeyId != null) {
888 publishBundlesIfNeeded(false, false);
889 session.resetPreKeyId();
890 }
891 } catch (CryptoFailedException e) {
892 Log.w(Config.LOGTAG, getLogprefix(account) + "Failed to decrypt message: " + e.getMessage());
893 }
894
895 if (session.isFresh() && plaintextMessage != null) {
896 sessions.put(session);
897 }
898
899 return plaintextMessage;
900 }
901
902 public XmppAxolotlMessage.XmppAxolotlKeyTransportMessage processReceivingKeyTransportMessage(XmppAxolotlMessage message) {
903 XmppAxolotlMessage.XmppAxolotlKeyTransportMessage keyTransportMessage;
904
905 XmppAxolotlSession session = getReceivingSession(message);
906 keyTransportMessage = message.getParameters(session, getOwnDeviceId());
907
908 if (session.isFresh() && keyTransportMessage != null) {
909 sessions.put(session);
910 }
911
912 return keyTransportMessage;
913 }
914}