1package eu.siacs.conversations.crypto.axolotl;
   2
   3import android.os.Bundle;
   4import android.security.KeyChain;
   5import android.support.annotation.NonNull;
   6import android.support.annotation.Nullable;
   7import android.util.Log;
   8import android.util.Pair;
   9
  10import org.bouncycastle.jce.provider.BouncyCastleProvider;
  11import org.whispersystems.libsignal.SignalProtocolAddress;
  12import org.whispersystems.libsignal.IdentityKey;
  13import org.whispersystems.libsignal.IdentityKeyPair;
  14import org.whispersystems.libsignal.InvalidKeyException;
  15import org.whispersystems.libsignal.InvalidKeyIdException;
  16import org.whispersystems.libsignal.SessionBuilder;
  17import org.whispersystems.libsignal.UntrustedIdentityException;
  18import org.whispersystems.libsignal.ecc.ECPublicKey;
  19import org.whispersystems.libsignal.state.PreKeyBundle;
  20import org.whispersystems.libsignal.state.PreKeyRecord;
  21import org.whispersystems.libsignal.state.SignedPreKeyRecord;
  22import org.whispersystems.libsignal.util.KeyHelper;
  23
  24import java.security.PrivateKey;
  25import java.security.Security;
  26import java.security.Signature;
  27import java.security.cert.X509Certificate;
  28import java.util.ArrayList;
  29import java.util.Arrays;
  30import java.util.Collection;
  31import java.util.Collections;
  32import java.util.HashMap;
  33import java.util.HashSet;
  34import java.util.Iterator;
  35import java.util.List;
  36import java.util.Map;
  37import java.util.Random;
  38import java.util.Set;
  39import java.util.concurrent.atomic.AtomicBoolean;
  40
  41import eu.siacs.conversations.Config;
  42import eu.siacs.conversations.entities.Account;
  43import eu.siacs.conversations.entities.Contact;
  44import eu.siacs.conversations.entities.Conversation;
  45import eu.siacs.conversations.entities.Message;
  46import eu.siacs.conversations.parser.IqParser;
  47import eu.siacs.conversations.services.XmppConnectionService;
  48import eu.siacs.conversations.utils.CryptoHelper;
  49import eu.siacs.conversations.utils.SerialSingleThreadExecutor;
  50import eu.siacs.conversations.xml.Element;
  51import eu.siacs.conversations.xml.Namespace;
  52import eu.siacs.conversations.xmpp.OnAdvancedStreamFeaturesLoaded;
  53import eu.siacs.conversations.xmpp.OnIqPacketReceived;
  54import eu.siacs.conversations.xmpp.pep.PublishOptions;
  55import eu.siacs.conversations.xmpp.stanzas.IqPacket;
  56import eu.siacs.conversations.xmpp.stanzas.MessagePacket;
  57import rocks.xmpp.addr.Jid;
  58
  59public class AxolotlService implements OnAdvancedStreamFeaturesLoaded {
  60
  61	public static final String PEP_PREFIX = "eu.siacs.conversations.axolotl";
  62	public static final String PEP_DEVICE_LIST = PEP_PREFIX + ".devicelist";
  63	public static final String PEP_DEVICE_LIST_NOTIFY = PEP_DEVICE_LIST + "+notify";
  64	public static final String PEP_BUNDLES = PEP_PREFIX + ".bundles";
  65	public static final String PEP_VERIFICATION = PEP_PREFIX + ".verification";
  66	public static final String PEP_OMEMO_WHITELISTED = PEP_PREFIX + ".whitelisted";
  67
  68	public static final String LOGPREFIX = "AxolotlService";
  69
  70	public static final int NUM_KEYS_TO_PUBLISH = 100;
  71	public static final int publishTriesThreshold = 3;
  72
  73	private final Account account;
  74	private final XmppConnectionService mXmppConnectionService;
  75	private final SQLiteAxolotlStore axolotlStore;
  76	private final SessionMap sessions;
  77	private final Map<Jid, Set<Integer>> deviceIds;
  78	private final Map<String, XmppAxolotlMessage> messageCache;
  79	private final FetchStatusMap fetchStatusMap;
  80	private final Map<Jid, Boolean> fetchDeviceListStatus = new HashMap<>();
  81	private final HashMap<Jid, List<OnDeviceIdsFetched>> fetchDeviceIdsMap = new HashMap<>();
  82	private final SerialSingleThreadExecutor executor;
  83	private int numPublishTriesOnEmptyPep = 0;
  84	private boolean pepBroken = false;
  85	private int lastDeviceListNotificationHash = 0;
  86	private final HashSet<Integer> cleanedOwnDeviceIds = new HashSet<>();
  87	private Set<XmppAxolotlSession> postponedSessions = new HashSet<>(); //sessions stored here will receive after mam catchup treatment
  88
  89	private AtomicBoolean changeAccessMode = new AtomicBoolean(false);
  90
  91	@Override
  92	public void onAdvancedStreamFeaturesAvailable(Account account) {
  93		if (Config.supportOmemo()
  94				&& account.getXmppConnection() != null
  95				&& account.getXmppConnection().getFeatures().pep()) {
  96			publishBundlesIfNeeded(true, false);
  97		} else {
  98			Log.d(Config.LOGTAG, account.getJid().asBareJid() + ": skipping OMEMO initialization");
  99		}
 100	}
 101
 102	private boolean hasErrorFetchingDeviceList(Jid jid) {
 103		Boolean status = fetchDeviceListStatus.get(jid);
 104		return status != null && !status;
 105	}
 106
 107	public boolean hasErrorFetchingDeviceList(List<Jid> jids) {
 108		for(Jid jid : jids) {
 109			if (hasErrorFetchingDeviceList(jid)) {
 110				return true;
 111			}
 112		}
 113		return false;
 114	}
 115
 116	public boolean fetchMapHasErrors(List<Jid> jids) {
 117		for (Jid jid : jids) {
 118			if (deviceIds.get(jid) != null) {
 119				for (Integer foreignId : this.deviceIds.get(jid)) {
 120					SignalProtocolAddress address = new SignalProtocolAddress(jid.toString(), foreignId);
 121					if (fetchStatusMap.getAll(address.getName()).containsValue(FetchStatus.ERROR)) {
 122						return true;
 123					}
 124				}
 125			}
 126		}
 127		return false;
 128	}
 129
 130	public void preVerifyFingerprint(Contact contact, String fingerprint) {
 131		axolotlStore.preVerifyFingerprint(contact.getAccount(), contact.getJid().asBareJid().toString(), fingerprint);
 132	}
 133
 134	public void preVerifyFingerprint(Account account, String fingerprint) {
 135		axolotlStore.preVerifyFingerprint(account, account.getJid().asBareJid().toString(), fingerprint);
 136	}
 137
 138	public boolean hasVerifiedKeys(String name) {
 139		for (XmppAxolotlSession session : this.sessions.getAll(name).values()) {
 140			if (session.getTrust().isVerified()) {
 141				return true;
 142			}
 143		}
 144		return false;
 145	}
 146
 147	private static class AxolotlAddressMap<T> {
 148		protected Map<String, Map<Integer, T>> map;
 149		protected final Object MAP_LOCK = new Object();
 150
 151		public AxolotlAddressMap() {
 152			this.map = new HashMap<>();
 153		}
 154
 155		public void put(SignalProtocolAddress address, T value) {
 156			synchronized (MAP_LOCK) {
 157				Map<Integer, T> devices = map.get(address.getName());
 158				if (devices == null) {
 159					devices = new HashMap<>();
 160					map.put(address.getName(), devices);
 161				}
 162				devices.put(address.getDeviceId(), value);
 163			}
 164		}
 165
 166		public T get(SignalProtocolAddress address) {
 167			synchronized (MAP_LOCK) {
 168				Map<Integer, T> devices = map.get(address.getName());
 169				if (devices == null) {
 170					return null;
 171				}
 172				return devices.get(address.getDeviceId());
 173			}
 174		}
 175
 176		public Map<Integer, T> getAll(String name) {
 177			synchronized (MAP_LOCK) {
 178				Map<Integer, T> devices = map.get(name);
 179				if (devices == null) {
 180					return new HashMap<>();
 181				}
 182				return devices;
 183			}
 184		}
 185
 186		public boolean hasAny(SignalProtocolAddress address) {
 187			synchronized (MAP_LOCK) {
 188				Map<Integer, T> devices = map.get(address.getName());
 189				return devices != null && !devices.isEmpty();
 190			}
 191		}
 192
 193		public void clear() {
 194			map.clear();
 195		}
 196
 197	}
 198
 199	private static class SessionMap extends AxolotlAddressMap<XmppAxolotlSession> {
 200		private final XmppConnectionService xmppConnectionService;
 201		private final Account account;
 202
 203		public SessionMap(XmppConnectionService service, SQLiteAxolotlStore store, Account account) {
 204			super();
 205			this.xmppConnectionService = service;
 206			this.account = account;
 207			this.fillMap(store);
 208		}
 209
 210		public Set<Jid> findCounterpartsForSourceId(Integer sid) {
 211			Set<Jid> candidates = new HashSet<>();
 212			synchronized (MAP_LOCK) {
 213				for(Map.Entry<String,Map<Integer,XmppAxolotlSession>> entry : map.entrySet()) {
 214					String key = entry.getKey();
 215					if (entry.getValue().containsKey(sid)) {
 216						candidates.add(Jid.of(key));
 217					}
 218				}
 219			}
 220			return candidates;
 221		}
 222
 223		private void putDevicesForJid(String bareJid, List<Integer> deviceIds, SQLiteAxolotlStore store) {
 224			for (Integer deviceId : deviceIds) {
 225				SignalProtocolAddress axolotlAddress = new SignalProtocolAddress(bareJid, deviceId);
 226				IdentityKey identityKey = store.loadSession(axolotlAddress).getSessionState().getRemoteIdentityKey();
 227				if (Config.X509_VERIFICATION) {
 228					X509Certificate certificate = store.getFingerprintCertificate(CryptoHelper.bytesToHex(identityKey.getPublicKey().serialize()));
 229					if (certificate != null) {
 230						Bundle information = CryptoHelper.extractCertificateInformation(certificate);
 231						try {
 232							final String cn = information.getString("subject_cn");
 233							final Jid jid = Jid.of(bareJid);
 234							Log.d(Config.LOGTAG, "setting common name for " + jid + " to " + cn);
 235							account.getRoster().getContact(jid).setCommonName(cn);
 236						} catch (final IllegalArgumentException ignored) {
 237							//ignored
 238						}
 239					}
 240				}
 241				this.put(axolotlAddress, new XmppAxolotlSession(account, store, axolotlAddress, identityKey));
 242			}
 243		}
 244
 245		private void fillMap(SQLiteAxolotlStore store) {
 246			List<Integer> deviceIds = store.getSubDeviceSessions(account.getJid().asBareJid().toString());
 247			putDevicesForJid(account.getJid().asBareJid().toString(), deviceIds, store);
 248			for (String address : store.getKnownAddresses()) {
 249				deviceIds = store.getSubDeviceSessions(address);
 250				putDevicesForJid(address, deviceIds, store);
 251			}
 252		}
 253
 254		@Override
 255		public void put(SignalProtocolAddress address, XmppAxolotlSession value) {
 256			super.put(address, value);
 257			value.setNotFresh();
 258		}
 259
 260		public void put(XmppAxolotlSession session) {
 261			this.put(session.getRemoteAddress(), session);
 262		}
 263	}
 264
 265	public enum FetchStatus {
 266		PENDING,
 267		SUCCESS,
 268		SUCCESS_VERIFIED,
 269		TIMEOUT,
 270		SUCCESS_TRUSTED,
 271		ERROR
 272	}
 273
 274	private static class FetchStatusMap extends AxolotlAddressMap<FetchStatus> {
 275
 276		public void clearErrorFor(Jid jid) {
 277			synchronized (MAP_LOCK) {
 278				Map<Integer, FetchStatus> devices = this.map.get(jid.asBareJid().toString());
 279				if (devices == null) {
 280					return;
 281				}
 282				for (Map.Entry<Integer, FetchStatus> entry : devices.entrySet()) {
 283					if (entry.getValue() == FetchStatus.ERROR) {
 284						Log.d(Config.LOGTAG, "resetting error for " + jid.asBareJid() + "(" + entry.getKey() + ")");
 285						entry.setValue(FetchStatus.TIMEOUT);
 286					}
 287				}
 288			}
 289		}
 290	}
 291
 292	public static String getLogprefix(Account account) {
 293		return LOGPREFIX + " (" + account.getJid().asBareJid().toString() + "): ";
 294	}
 295
 296	public AxolotlService(Account account, XmppConnectionService connectionService) {
 297		if (account == null || connectionService == null) {
 298			throw new IllegalArgumentException("account and service cannot be null");
 299		}
 300		if (Security.getProvider("BC") == null) {
 301			Security.addProvider(new BouncyCastleProvider());
 302		}
 303		this.mXmppConnectionService = connectionService;
 304		this.account = account;
 305		this.axolotlStore = new SQLiteAxolotlStore(this.account, this.mXmppConnectionService);
 306		this.deviceIds = new HashMap<>();
 307		this.messageCache = new HashMap<>();
 308		this.sessions = new SessionMap(mXmppConnectionService, axolotlStore, account);
 309		this.fetchStatusMap = new FetchStatusMap();
 310		this.executor = new SerialSingleThreadExecutor("Axolotl");
 311	}
 312
 313	public String getOwnFingerprint() {
 314		return CryptoHelper.bytesToHex(axolotlStore.getIdentityKeyPair().getPublicKey().serialize());
 315	}
 316
 317	public Set<IdentityKey> getKeysWithTrust(FingerprintStatus status) {
 318		return axolotlStore.getContactKeysWithTrust(account.getJid().asBareJid().toString(), status);
 319	}
 320
 321	public Set<IdentityKey> getKeysWithTrust(FingerprintStatus status, Jid jid) {
 322		return axolotlStore.getContactKeysWithTrust(jid.asBareJid().toString(), status);
 323	}
 324
 325	public Set<IdentityKey> getKeysWithTrust(FingerprintStatus status, List<Jid> jids) {
 326		Set<IdentityKey> keys = new HashSet<>();
 327		for (Jid jid : jids) {
 328			keys.addAll(axolotlStore.getContactKeysWithTrust(jid.toString(), status));
 329		}
 330		return keys;
 331	}
 332
 333	public Set<Jid> findCounterpartsBySourceId(int sid) {
 334		return sessions.findCounterpartsForSourceId(sid);
 335	}
 336
 337	public long getNumTrustedKeys(Jid jid) {
 338		return axolotlStore.getContactNumTrustedKeys(jid.asBareJid().toString());
 339	}
 340
 341	public boolean anyTargetHasNoTrustedKeys(List<Jid> jids) {
 342		for (Jid jid : jids) {
 343			if (axolotlStore.getContactNumTrustedKeys(jid.asBareJid().toString()) == 0) {
 344				return true;
 345			}
 346		}
 347		return false;
 348	}
 349
 350	private SignalProtocolAddress getAddressForJid(Jid jid) {
 351		return new SignalProtocolAddress(jid.toString(), 0);
 352	}
 353
 354	public Collection<XmppAxolotlSession> findOwnSessions() {
 355		SignalProtocolAddress ownAddress = getAddressForJid(account.getJid().asBareJid());
 356		ArrayList<XmppAxolotlSession> s = new ArrayList<>(this.sessions.getAll(ownAddress.getName()).values());
 357		Collections.sort(s);
 358		return s;
 359	}
 360
 361
 362	public Collection<XmppAxolotlSession> findSessionsForContact(Contact contact) {
 363		SignalProtocolAddress contactAddress = getAddressForJid(contact.getJid());
 364		ArrayList<XmppAxolotlSession> s = new ArrayList<>(this.sessions.getAll(contactAddress.getName()).values());
 365		Collections.sort(s);
 366		return s;
 367	}
 368
 369	private Set<XmppAxolotlSession> findSessionsForConversation(Conversation conversation) {
 370		if (conversation.getContact().isSelf()) {
 371			//will be added in findOwnSessions()
 372			return Collections.emptySet();
 373		}
 374		HashSet<XmppAxolotlSession> sessions = new HashSet<>();
 375		for (Jid jid : conversation.getAcceptedCryptoTargets()) {
 376			sessions.addAll(this.sessions.getAll(getAddressForJid(jid).getName()).values());
 377		}
 378		return sessions;
 379	}
 380
 381	private boolean hasAny(Jid jid) {
 382		return sessions.hasAny(getAddressForJid(jid));
 383	}
 384
 385	public boolean isPepBroken() {
 386		return this.pepBroken;
 387	}
 388
 389	public void resetBrokenness() {
 390		this.pepBroken = false;
 391		this.numPublishTriesOnEmptyPep = 0;
 392		this.lastDeviceListNotificationHash = 0;
 393	}
 394
 395	public void clearErrorsInFetchStatusMap(Jid jid) {
 396		fetchStatusMap.clearErrorFor(jid);
 397		fetchDeviceListStatus.remove(jid);
 398	}
 399
 400	public void regenerateKeys(boolean wipeOther) {
 401		axolotlStore.regenerate();
 402		sessions.clear();
 403		fetchStatusMap.clear();
 404		fetchDeviceIdsMap.clear();
 405		fetchDeviceListStatus.clear();
 406		publishBundlesIfNeeded(true, wipeOther);
 407	}
 408
 409	public void destroy() {
 410		Log.d(Config.LOGTAG, account.getJid().asBareJid() + ": destroying old axolotl service. no longer in use");
 411		mXmppConnectionService.databaseBackend.wipeAxolotlDb(account);
 412	}
 413
 414	public AxolotlService makeNew() {
 415		Log.d(Config.LOGTAG, account.getJid().asBareJid() + ": make new axolotl service");
 416		return new AxolotlService(this.account, this.mXmppConnectionService);
 417	}
 418
 419	public int getOwnDeviceId() {
 420		return axolotlStore.getLocalRegistrationId();
 421	}
 422
 423	public SignalProtocolAddress getOwnAxolotlAddress() {
 424		return new SignalProtocolAddress(account.getJid().asBareJid().toString(), getOwnDeviceId());
 425	}
 426
 427	public Set<Integer> getOwnDeviceIds() {
 428		return this.deviceIds.get(account.getJid().asBareJid());
 429	}
 430
 431	public void registerDevices(final Jid jid, @NonNull final Set<Integer> deviceIds) {
 432		final int hash = deviceIds.hashCode();
 433		final boolean me = jid.asBareJid().equals(account.getJid().asBareJid());
 434		if (me) {
 435			if (hash != 0 && hash == this.lastDeviceListNotificationHash) {
 436				Log.d(Config.LOGTAG, account.getJid().asBareJid() + ": ignoring duplicate own device id list");
 437				return;
 438			}
 439			this.lastDeviceListNotificationHash = hash;
 440		}
 441		boolean needsPublishing = me && !deviceIds.contains(getOwnDeviceId());
 442		if (me) {
 443			deviceIds.remove(getOwnDeviceId());
 444		}
 445		Set<Integer> expiredDevices = new HashSet<>(axolotlStore.getSubDeviceSessions(jid.asBareJid().toString()));
 446		expiredDevices.removeAll(deviceIds);
 447		for (Integer deviceId : expiredDevices) {
 448			SignalProtocolAddress address = new SignalProtocolAddress(jid.asBareJid().toString(), deviceId);
 449			XmppAxolotlSession session = sessions.get(address);
 450			if (session != null && session.getFingerprint() != null) {
 451				if (session.getTrust().isActive()) {
 452					session.setTrust(session.getTrust().toInactive());
 453				}
 454			}
 455		}
 456		Set<Integer> newDevices = new HashSet<>(deviceIds);
 457		for (Integer deviceId : newDevices) {
 458			SignalProtocolAddress address = new SignalProtocolAddress(jid.asBareJid().toString(), deviceId);
 459			XmppAxolotlSession session = sessions.get(address);
 460			if (session != null && session.getFingerprint() != null) {
 461				if (!session.getTrust().isActive()) {
 462					Log.d(Config.LOGTAG, "reactivating device with fingerprint " + session.getFingerprint());
 463					session.setTrust(session.getTrust().toActive());
 464				}
 465			}
 466		}
 467		if (me) {
 468			if (Config.OMEMO_AUTO_EXPIRY != 0) {
 469				needsPublishing |= deviceIds.removeAll(getExpiredDevices());
 470			}
 471			needsPublishing |= this.changeAccessMode.get();
 472			for (Integer deviceId : deviceIds) {
 473				SignalProtocolAddress ownDeviceAddress = new SignalProtocolAddress(jid.asBareJid().toString(), deviceId);
 474				if (sessions.get(ownDeviceAddress) == null) {
 475					FetchStatus status = fetchStatusMap.get(ownDeviceAddress);
 476					if (status == null || status == FetchStatus.TIMEOUT) {
 477						fetchStatusMap.put(ownDeviceAddress, FetchStatus.PENDING);
 478						this.buildSessionFromPEP(ownDeviceAddress);
 479					}
 480				}
 481			}
 482			if (needsPublishing) {
 483				publishOwnDeviceId(deviceIds);
 484			}
 485		}
 486		final Set<Integer> oldSet = this.deviceIds.get(jid);
 487		final boolean changed = oldSet == null || oldSet.hashCode() != hash;
 488		this.deviceIds.put(jid, deviceIds);
 489		if (changed) {
 490			mXmppConnectionService.updateConversationUi(); //update the lock icon
 491			mXmppConnectionService.keyStatusUpdated(null);
 492			if (me) {
 493				mXmppConnectionService.updateAccountUi();
 494			}
 495		} else {
 496			Log.d(Config.LOGTAG,"skipped device list update because it hasn't changed");
 497		}
 498	}
 499
 500	public void wipeOtherPepDevices() {
 501		if (pepBroken) {
 502			Log.d(Config.LOGTAG, getLogprefix(account) + "wipeOtherPepDevices called, but PEP is broken. Ignoring... ");
 503			return;
 504		}
 505		Set<Integer> deviceIds = new HashSet<>();
 506		deviceIds.add(getOwnDeviceId());
 507		publishDeviceIdsAndRefineAccessModel(deviceIds);
 508	}
 509
 510	public void distrustFingerprint(final String fingerprint) {
 511		final String fp = fingerprint.replaceAll("\\s", "");
 512		final FingerprintStatus fingerprintStatus = axolotlStore.getFingerprintStatus(fp);
 513		axolotlStore.setFingerprintStatus(fp, fingerprintStatus.toUntrusted());
 514	}
 515
 516	private void publishOwnDeviceIdIfNeeded() {
 517		if (pepBroken) {
 518			Log.d(Config.LOGTAG, getLogprefix(account) + "publishOwnDeviceIdIfNeeded called, but PEP is broken. Ignoring... ");
 519			return;
 520		}
 521		IqPacket packet = mXmppConnectionService.getIqGenerator().retrieveDeviceIds(account.getJid().asBareJid());
 522		mXmppConnectionService.sendIqPacket(account, packet, new OnIqPacketReceived() {
 523			@Override
 524			public void onIqPacketReceived(Account account, IqPacket packet) {
 525				if (packet.getType() == IqPacket.TYPE.TIMEOUT) {
 526					Log.d(Config.LOGTAG, getLogprefix(account) + "Timeout received while retrieving own Device Ids.");
 527				} else {
 528					Element item = mXmppConnectionService.getIqParser().getItem(packet);
 529					Set<Integer> deviceIds = mXmppConnectionService.getIqParser().deviceIds(item);
 530					Log.d(Config.LOGTAG, account.getJid().asBareJid() + ": retrieved own device list: " + deviceIds);
 531					registerDevices(account.getJid().asBareJid(), deviceIds);
 532				}
 533			}
 534		});
 535	}
 536
 537	private Set<Integer> getExpiredDevices() {
 538		Set<Integer> devices = new HashSet<>();
 539		for (XmppAxolotlSession session : findOwnSessions()) {
 540			if (session.getTrust().isActive()) {
 541				long diff = System.currentTimeMillis() - session.getTrust().getLastActivation();
 542				if (diff > Config.OMEMO_AUTO_EXPIRY) {
 543					long lastMessageDiff = System.currentTimeMillis() - mXmppConnectionService.databaseBackend.getLastTimeFingerprintUsed(account, session.getFingerprint());
 544					long hours = Math.round(lastMessageDiff / (1000 * 60.0 * 60.0));
 545					if (lastMessageDiff > Config.OMEMO_AUTO_EXPIRY) {
 546						devices.add(session.getRemoteAddress().getDeviceId());
 547						session.setTrust(session.getTrust().toInactive());
 548						Log.d(Config.LOGTAG, account.getJid().asBareJid() + ": added own device " + session.getFingerprint() + " to list of expired devices. Last message received " + hours + " hours ago");
 549					} else {
 550						Log.d(Config.LOGTAG, account.getJid().asBareJid() + ": own device " + session.getFingerprint() + " was active " + hours + " hours ago");
 551					}
 552				}
 553			}
 554		}
 555		return devices;
 556	}
 557
 558	private void publishOwnDeviceId(Set<Integer> deviceIds) {
 559		Set<Integer> deviceIdsCopy = new HashSet<>(deviceIds);
 560		Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "publishing own device ids");
 561		if (deviceIdsCopy.isEmpty()) {
 562			if (numPublishTriesOnEmptyPep >= publishTriesThreshold) {
 563				Log.w(Config.LOGTAG, getLogprefix(account) + "Own device publish attempt threshold exceeded, aborting...");
 564				pepBroken = true;
 565				return;
 566			} else {
 567				numPublishTriesOnEmptyPep++;
 568				Log.w(Config.LOGTAG, getLogprefix(account) + "Own device list empty, attempting to publish (try " + numPublishTriesOnEmptyPep + ")");
 569			}
 570		} else {
 571			numPublishTriesOnEmptyPep = 0;
 572		}
 573		deviceIdsCopy.add(getOwnDeviceId());
 574		publishDeviceIdsAndRefineAccessModel(deviceIdsCopy);
 575	}
 576
 577	private void publishDeviceIdsAndRefineAccessModel(Set<Integer> ids) {
 578		publishDeviceIdsAndRefineAccessModel(ids, true);
 579	}
 580
 581	private void publishDeviceIdsAndRefineAccessModel(final Set<Integer> ids, final boolean firstAttempt) {
 582		final Bundle publishOptions = account.getXmppConnection().getFeatures().pepPublishOptions() ? PublishOptions.openAccess() : null;
 583		IqPacket publish = mXmppConnectionService.getIqGenerator().publishDeviceIds(ids, publishOptions);
 584		mXmppConnectionService.sendIqPacket(account, publish, new OnIqPacketReceived() {
 585			@Override
 586			public void onIqPacketReceived(Account account, IqPacket packet) {
 587				final Element error = packet.getType() == IqPacket.TYPE.ERROR ? packet.findChild("error") : null;
 588				final boolean preConditionNotMet = error != null && error.hasChild("precondition-not-met", Namespace.PUBSUB_ERROR);
 589				if (firstAttempt && preConditionNotMet) {
 590					Log.d(Config.LOGTAG, account.getJid().asBareJid() + ": precondition wasn't met for device list. pushing node configuration");
 591					mXmppConnectionService.pushNodeConfiguration(account, AxolotlService.PEP_DEVICE_LIST, publishOptions, new XmppConnectionService.OnConfigurationPushed() {
 592						@Override
 593						public void onPushSucceeded() {
 594							publishDeviceIdsAndRefineAccessModel(ids, false);
 595						}
 596
 597						@Override
 598						public void onPushFailed() {
 599							publishDeviceIdsAndRefineAccessModel(ids, false);
 600						}
 601					});
 602				} else {
 603					if (AxolotlService.this.changeAccessMode.compareAndSet(true, false)) {
 604						Log.d(Config.LOGTAG, account.getJid().asBareJid() + ": done changing access mode");
 605						account.setOption(Account.OPTION_REQUIRES_ACCESS_MODE_CHANGE, false);
 606						mXmppConnectionService.databaseBackend.updateAccount(account);
 607					}
 608					if (packet.getType() == IqPacket.TYPE.ERROR) {
 609						if (preConditionNotMet) {
 610							Log.d(Config.LOGTAG,account.getJid().asBareJid()+": device list pre condition still not met on second attempt");
 611						} else if (error != null) {
 612							pepBroken = true;
 613							Log.d(Config.LOGTAG, getLogprefix(account) + "Error received while publishing own device id" + packet.findChild("error"));
 614						}
 615
 616					}
 617				}
 618			}
 619		});
 620	}
 621
 622	public void publishDeviceVerificationAndBundle(final SignedPreKeyRecord signedPreKeyRecord,
 623	                                               final Set<PreKeyRecord> preKeyRecords,
 624	                                               final boolean announceAfter,
 625	                                               final boolean wipe) {
 626		try {
 627			IdentityKey axolotlPublicKey = axolotlStore.getIdentityKeyPair().getPublicKey();
 628			PrivateKey x509PrivateKey = KeyChain.getPrivateKey(mXmppConnectionService, account.getPrivateKeyAlias());
 629			X509Certificate[] chain = KeyChain.getCertificateChain(mXmppConnectionService, account.getPrivateKeyAlias());
 630			Signature verifier = Signature.getInstance("sha256WithRSA");
 631			verifier.initSign(x509PrivateKey, mXmppConnectionService.getRNG());
 632			verifier.update(axolotlPublicKey.serialize());
 633			byte[] signature = verifier.sign();
 634			IqPacket packet = mXmppConnectionService.getIqGenerator().publishVerification(signature, chain, getOwnDeviceId());
 635			Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + ": publish verification for device " + getOwnDeviceId());
 636			mXmppConnectionService.sendIqPacket(account, packet, new OnIqPacketReceived() {
 637				@Override
 638				public void onIqPacketReceived(final Account account, IqPacket packet) {
 639					String node = AxolotlService.PEP_VERIFICATION + ":" + getOwnDeviceId();
 640					mXmppConnectionService.pushNodeConfiguration(account, node, PublishOptions.openAccess(), new XmppConnectionService.OnConfigurationPushed() {
 641						@Override
 642						public void onPushSucceeded() {
 643							Log.d(Config.LOGTAG, getLogprefix(account) + "configured verification node to be world readable");
 644							publishDeviceBundle(signedPreKeyRecord, preKeyRecords, announceAfter, wipe);
 645						}
 646
 647						@Override
 648						public void onPushFailed() {
 649							Log.d(Config.LOGTAG, getLogprefix(account) + "unable to set access model on verification node");
 650							publishDeviceBundle(signedPreKeyRecord, preKeyRecords, announceAfter, wipe);
 651						}
 652					});
 653				}
 654			});
 655		} catch (Exception e) {
 656			e.printStackTrace();
 657		}
 658	}
 659
 660	public void publishBundlesIfNeeded(final boolean announce, final boolean wipe) {
 661		if (pepBroken) {
 662			Log.d(Config.LOGTAG, getLogprefix(account) + "publishBundlesIfNeeded called, but PEP is broken. Ignoring... ");
 663			return;
 664		}
 665
 666		if (account.getXmppConnection().getFeatures().pepPublishOptions()) {
 667			this.changeAccessMode.set(account.isOptionSet(Account.OPTION_REQUIRES_ACCESS_MODE_CHANGE));
 668		} else {
 669			if (account.setOption(Account.OPTION_REQUIRES_ACCESS_MODE_CHANGE, true)) {
 670				Log.d(Config.LOGTAG, account.getJid().asBareJid() + ": server doesn’t support publish-options. setting for later access mode change");
 671				mXmppConnectionService.databaseBackend.updateAccount(account);
 672			}
 673		}
 674		if (this.changeAccessMode.get()) {
 675			Log.d(Config.LOGTAG, account.getJid().asBareJid() + ": server gained publish-options capabilities. changing access model");
 676		}
 677		IqPacket packet = mXmppConnectionService.getIqGenerator().retrieveBundlesForDevice(account.getJid().asBareJid(), getOwnDeviceId());
 678		mXmppConnectionService.sendIqPacket(account, packet, new OnIqPacketReceived() {
 679			@Override
 680			public void onIqPacketReceived(Account account, IqPacket packet) {
 681
 682				if (packet.getType() == IqPacket.TYPE.TIMEOUT) {
 683					return; //ignore timeout. do nothing
 684				}
 685
 686				if (packet.getType() == IqPacket.TYPE.ERROR) {
 687					Element error = packet.findChild("error");
 688					if (error == null || !error.hasChild("item-not-found")) {
 689						pepBroken = true;
 690						Log.w(Config.LOGTAG, AxolotlService.getLogprefix(account) + "request for device bundles came back with something other than item-not-found" + packet);
 691						return;
 692					}
 693				}
 694
 695				PreKeyBundle bundle = mXmppConnectionService.getIqParser().bundle(packet);
 696				Map<Integer, ECPublicKey> keys = mXmppConnectionService.getIqParser().preKeyPublics(packet);
 697				boolean flush = false;
 698				if (bundle == null) {
 699					Log.w(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Received invalid bundle:" + packet);
 700					bundle = new PreKeyBundle(-1, -1, -1, null, -1, null, null, null);
 701					flush = true;
 702				}
 703				if (keys == null) {
 704					Log.w(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Received invalid prekeys:" + packet);
 705				}
 706				try {
 707					boolean changed = false;
 708					// Validate IdentityKey
 709					IdentityKeyPair identityKeyPair = axolotlStore.getIdentityKeyPair();
 710					if (flush || !identityKeyPair.getPublicKey().equals(bundle.getIdentityKey())) {
 711						Log.i(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Adding own IdentityKey " + identityKeyPair.getPublicKey() + " to PEP.");
 712						changed = true;
 713					}
 714
 715					// Validate signedPreKeyRecord + ID
 716					SignedPreKeyRecord signedPreKeyRecord;
 717					int numSignedPreKeys = axolotlStore.getSignedPreKeysCount();
 718					try {
 719						signedPreKeyRecord = axolotlStore.loadSignedPreKey(bundle.getSignedPreKeyId());
 720						if (flush
 721								|| !bundle.getSignedPreKey().equals(signedPreKeyRecord.getKeyPair().getPublicKey())
 722								|| !Arrays.equals(bundle.getSignedPreKeySignature(), signedPreKeyRecord.getSignature())) {
 723							Log.i(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Adding new signedPreKey with ID " + (numSignedPreKeys + 1) + " to PEP.");
 724							signedPreKeyRecord = KeyHelper.generateSignedPreKey(identityKeyPair, numSignedPreKeys + 1);
 725							axolotlStore.storeSignedPreKey(signedPreKeyRecord.getId(), signedPreKeyRecord);
 726							changed = true;
 727						}
 728					} catch (InvalidKeyIdException e) {
 729						Log.i(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Adding new signedPreKey with ID " + (numSignedPreKeys + 1) + " to PEP.");
 730						signedPreKeyRecord = KeyHelper.generateSignedPreKey(identityKeyPair, numSignedPreKeys + 1);
 731						axolotlStore.storeSignedPreKey(signedPreKeyRecord.getId(), signedPreKeyRecord);
 732						changed = true;
 733					}
 734
 735					// Validate PreKeys
 736					Set<PreKeyRecord> preKeyRecords = new HashSet<>();
 737					if (keys != null) {
 738						for (Integer id : keys.keySet()) {
 739							try {
 740								PreKeyRecord preKeyRecord = axolotlStore.loadPreKey(id);
 741								if (preKeyRecord.getKeyPair().getPublicKey().equals(keys.get(id))) {
 742									preKeyRecords.add(preKeyRecord);
 743								}
 744							} catch (InvalidKeyIdException ignored) {
 745							}
 746						}
 747					}
 748					int newKeys = NUM_KEYS_TO_PUBLISH - preKeyRecords.size();
 749					if (newKeys > 0) {
 750						List<PreKeyRecord> newRecords = KeyHelper.generatePreKeys(
 751								axolotlStore.getCurrentPreKeyId() + 1, newKeys);
 752						preKeyRecords.addAll(newRecords);
 753						for (PreKeyRecord record : newRecords) {
 754							axolotlStore.storePreKey(record.getId(), record);
 755						}
 756						changed = true;
 757						Log.i(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Adding " + newKeys + " new preKeys to PEP.");
 758					}
 759
 760
 761					if (changed || changeAccessMode.get()) {
 762						if (account.getPrivateKeyAlias() != null && Config.X509_VERIFICATION) {
 763							mXmppConnectionService.publishDisplayName(account);
 764							publishDeviceVerificationAndBundle(signedPreKeyRecord, preKeyRecords, announce, wipe);
 765						} else {
 766							publishDeviceBundle(signedPreKeyRecord, preKeyRecords, announce, wipe);
 767						}
 768					} else {
 769						Log.d(Config.LOGTAG, getLogprefix(account) + "Bundle " + getOwnDeviceId() + " in PEP was current");
 770						if (wipe) {
 771							wipeOtherPepDevices();
 772						} else if (announce) {
 773							Log.d(Config.LOGTAG, getLogprefix(account) + "Announcing device " + getOwnDeviceId());
 774							publishOwnDeviceIdIfNeeded();
 775						}
 776					}
 777				} catch (InvalidKeyException e) {
 778					Log.e(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Failed to publish bundle " + getOwnDeviceId() + ", reason: " + e.getMessage());
 779				}
 780			}
 781		});
 782	}
 783
 784	private void publishDeviceBundle(SignedPreKeyRecord signedPreKeyRecord,
 785	                                 Set<PreKeyRecord> preKeyRecords,
 786	                                 final boolean announceAfter,
 787	                                 final boolean wipe) {
 788		publishDeviceBundle(signedPreKeyRecord, preKeyRecords, announceAfter, wipe, true);
 789	}
 790
 791	private void publishDeviceBundle(final SignedPreKeyRecord signedPreKeyRecord,
 792	                                 final Set<PreKeyRecord> preKeyRecords,
 793	                                 final boolean announceAfter,
 794	                                 final boolean wipe,
 795	                                 final boolean firstAttempt) {
 796		final Bundle publishOptions = account.getXmppConnection().getFeatures().pepPublishOptions() ? PublishOptions.openAccess() : null;
 797		IqPacket publish = mXmppConnectionService.getIqGenerator().publishBundles(
 798				signedPreKeyRecord, axolotlStore.getIdentityKeyPair().getPublicKey(),
 799				preKeyRecords, getOwnDeviceId(), publishOptions);
 800		Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + ": Bundle " + getOwnDeviceId() + " in PEP not current. Publishing...");
 801		mXmppConnectionService.sendIqPacket(account, publish, new OnIqPacketReceived() {
 802			@Override
 803			public void onIqPacketReceived(final Account account, IqPacket packet) {
 804				final Element error = packet.getType() == IqPacket.TYPE.ERROR ? packet.findChild("error") : null;
 805				final boolean preconditionNotMet = error != null && error.hasChild("precondition-not-met", Namespace.PUBSUB_ERROR);
 806				if (firstAttempt && preconditionNotMet) {
 807					Log.d(Config.LOGTAG, account.getJid().asBareJid() + ": precondition wasn't met for bundle. pushing node configuration");
 808					final String node = AxolotlService.PEP_BUNDLES + ":" + getOwnDeviceId();
 809					mXmppConnectionService.pushNodeConfiguration(account, node, publishOptions, new XmppConnectionService.OnConfigurationPushed() {
 810						@Override
 811						public void onPushSucceeded() {
 812							publishDeviceBundle(signedPreKeyRecord, preKeyRecords, announceAfter, wipe, false);
 813						}
 814
 815						@Override
 816						public void onPushFailed() {
 817							publishDeviceBundle(signedPreKeyRecord, preKeyRecords, announceAfter, wipe, false);
 818						}
 819					});
 820				} else if (packet.getType() == IqPacket.TYPE.RESULT) {
 821					Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Successfully published bundle. ");
 822					if (wipe) {
 823						wipeOtherPepDevices();
 824					} else if (announceAfter) {
 825						Log.d(Config.LOGTAG, getLogprefix(account) + "Announcing device " + getOwnDeviceId());
 826						publishOwnDeviceIdIfNeeded();
 827					}
 828				} else if (packet.getType() == IqPacket.TYPE.ERROR) {
 829					if (preconditionNotMet) {
 830						Log.d(Config.LOGTAG,getLogprefix(account) + "bundle precondition still not met after second attempt");
 831					} else {
 832						Log.d(Config.LOGTAG, getLogprefix(account) + "Error received while publishing bundle: " + error);
 833					}
 834					pepBroken = true;
 835				}
 836			}
 837		});
 838	}
 839
 840	public enum AxolotlCapability {
 841		FULL,
 842		MISSING_PRESENCE,
 843		MISSING_KEYS,
 844		WRONG_CONFIGURATION,
 845		NO_MEMBERS
 846	}
 847
 848	public boolean isConversationAxolotlCapable(Conversation conversation) {
 849		return conversation.isSingleOrPrivateAndNonAnonymous();
 850	}
 851
 852	public Pair<AxolotlCapability, Jid> isConversationAxolotlCapableDetailed(Conversation conversation) {
 853		if (conversation.isSingleOrPrivateAndNonAnonymous()) {
 854			final List<Jid> jids = getCryptoTargets(conversation);
 855			for (Jid jid : jids) {
 856				if (!hasAny(jid) && (!deviceIds.containsKey(jid) || deviceIds.get(jid).isEmpty())) {
 857					if (conversation.getAccount().getRoster().getContact(jid).mutualPresenceSubscription()) {
 858						return new Pair<>(AxolotlCapability.MISSING_KEYS, jid);
 859					} else {
 860						return new Pair<>(AxolotlCapability.MISSING_PRESENCE, jid);
 861					}
 862				}
 863			}
 864			if (jids.size() > 0) {
 865				return new Pair<>(AxolotlCapability.FULL, null);
 866			} else {
 867				return new Pair<>(AxolotlCapability.NO_MEMBERS, null);
 868			}
 869		} else {
 870			return new Pair<>(AxolotlCapability.WRONG_CONFIGURATION, null);
 871		}
 872	}
 873
 874	public List<Jid> getCryptoTargets(Conversation conversation) {
 875		final List<Jid> jids;
 876		if (conversation.getMode() == Conversation.MODE_SINGLE) {
 877			jids = new ArrayList<>();
 878			jids.add(conversation.getJid().asBareJid());
 879		} else {
 880			jids = conversation.getMucOptions().getMembers(false);
 881		}
 882		return jids;
 883	}
 884
 885	public FingerprintStatus getFingerprintTrust(String fingerprint) {
 886		return axolotlStore.getFingerprintStatus(fingerprint);
 887	}
 888
 889	public X509Certificate getFingerprintCertificate(String fingerprint) {
 890		return axolotlStore.getFingerprintCertificate(fingerprint);
 891	}
 892
 893	public void setFingerprintTrust(String fingerprint, FingerprintStatus status) {
 894		axolotlStore.setFingerprintStatus(fingerprint, status);
 895	}
 896
 897	private void verifySessionWithPEP(final XmppAxolotlSession session) {
 898		Log.d(Config.LOGTAG, "trying to verify fresh session (" + session.getRemoteAddress().getName() + ") with pep");
 899		final SignalProtocolAddress address = session.getRemoteAddress();
 900		final IdentityKey identityKey = session.getIdentityKey();
 901		try {
 902			IqPacket packet = mXmppConnectionService.getIqGenerator().retrieveVerificationForDevice(Jid.of(address.getName()), address.getDeviceId());
 903			mXmppConnectionService.sendIqPacket(account, packet, new OnIqPacketReceived() {
 904				@Override
 905				public void onIqPacketReceived(Account account, IqPacket packet) {
 906					Pair<X509Certificate[], byte[]> verification = mXmppConnectionService.getIqParser().verification(packet);
 907					if (verification != null) {
 908						try {
 909							Signature verifier = Signature.getInstance("sha256WithRSA");
 910							verifier.initVerify(verification.first[0]);
 911							verifier.update(identityKey.serialize());
 912							if (verifier.verify(verification.second)) {
 913								try {
 914									mXmppConnectionService.getMemorizingTrustManager().getNonInteractive().checkClientTrusted(verification.first, "RSA");
 915									String fingerprint = session.getFingerprint();
 916									Log.d(Config.LOGTAG, "verified session with x.509 signature. fingerprint was: " + fingerprint);
 917									setFingerprintTrust(fingerprint, FingerprintStatus.createActiveVerified(true));
 918									axolotlStore.setFingerprintCertificate(fingerprint, verification.first[0]);
 919									fetchStatusMap.put(address, FetchStatus.SUCCESS_VERIFIED);
 920									Bundle information = CryptoHelper.extractCertificateInformation(verification.first[0]);
 921									try {
 922										final String cn = information.getString("subject_cn");
 923										final Jid jid = Jid.of(address.getName());
 924										Log.d(Config.LOGTAG, "setting common name for " + jid + " to " + cn);
 925										account.getRoster().getContact(jid).setCommonName(cn);
 926									} catch (final IllegalArgumentException ignored) {
 927										//ignored
 928									}
 929									finishBuildingSessionsFromPEP(address);
 930									return;
 931								} catch (Exception e) {
 932									Log.d(Config.LOGTAG, "could not verify certificate");
 933								}
 934							}
 935						} catch (Exception e) {
 936							Log.d(Config.LOGTAG, "error during verification " + e.getMessage());
 937						}
 938					} else {
 939						Log.d(Config.LOGTAG, "no verification found");
 940					}
 941					fetchStatusMap.put(address, FetchStatus.SUCCESS);
 942					finishBuildingSessionsFromPEP(address);
 943				}
 944			});
 945		} catch (IllegalArgumentException e) {
 946			fetchStatusMap.put(address, FetchStatus.SUCCESS);
 947			finishBuildingSessionsFromPEP(address);
 948		}
 949	}
 950
 951	private final Set<Integer> PREVIOUSLY_REMOVED_FROM_ANNOUNCEMENT = new HashSet<>();
 952
 953	private void finishBuildingSessionsFromPEP(final SignalProtocolAddress address) {
 954		SignalProtocolAddress ownAddress = new SignalProtocolAddress(account.getJid().asBareJid().toString(), 0);
 955		Map<Integer, FetchStatus> own = fetchStatusMap.getAll(ownAddress.getName());
 956		Map<Integer, FetchStatus> remote = fetchStatusMap.getAll(address.getName());
 957		if (!own.containsValue(FetchStatus.PENDING) && !remote.containsValue(FetchStatus.PENDING)) {
 958			FetchStatus report = null;
 959			if (own.containsValue(FetchStatus.SUCCESS) || remote.containsValue(FetchStatus.SUCCESS)) {
 960				report = FetchStatus.SUCCESS;
 961			} else if (own.containsValue(FetchStatus.SUCCESS_VERIFIED) || remote.containsValue(FetchStatus.SUCCESS_VERIFIED)) {
 962				report = FetchStatus.SUCCESS_VERIFIED;
 963			} else if (own.containsValue(FetchStatus.SUCCESS_TRUSTED) || remote.containsValue(FetchStatus.SUCCESS_TRUSTED)) {
 964				report = FetchStatus.SUCCESS_TRUSTED;
 965			} else if (own.containsValue(FetchStatus.ERROR) || remote.containsValue(FetchStatus.ERROR)) {
 966				report = FetchStatus.ERROR;
 967			}
 968			mXmppConnectionService.keyStatusUpdated(report);
 969		}
 970		if (Config.REMOVE_BROKEN_DEVICES) {
 971			Set<Integer> ownDeviceIds = new HashSet<>(getOwnDeviceIds());
 972			boolean publish = false;
 973			for (Map.Entry<Integer, FetchStatus> entry : own.entrySet()) {
 974				int id = entry.getKey();
 975				if (entry.getValue() == FetchStatus.ERROR && PREVIOUSLY_REMOVED_FROM_ANNOUNCEMENT.add(id) && ownDeviceIds.remove(id)) {
 976					publish = true;
 977					Log.d(Config.LOGTAG, account.getJid().asBareJid() + ": error fetching own device with id " + id + ". removing from announcement");
 978				}
 979			}
 980			if (publish) {
 981				publishOwnDeviceId(ownDeviceIds);
 982			}
 983		}
 984	}
 985
 986	public boolean hasEmptyDeviceList(Jid jid) {
 987		return !hasAny(jid) && (!deviceIds.containsKey(jid) || deviceIds.get(jid).isEmpty());
 988	}
 989
 990	public interface OnDeviceIdsFetched {
 991		void fetched(Jid jid, Set<Integer> deviceIds);
 992	}
 993
 994	public interface OnMultipleDeviceIdFetched {
 995		void fetched();
 996	}
 997
 998	public void fetchDeviceIds(final Jid jid) {
 999		fetchDeviceIds(jid, null);
1000	}
1001
1002	private void fetchDeviceIds(final Jid jid, OnDeviceIdsFetched callback) {
1003		IqPacket packet;
1004		synchronized (this.fetchDeviceIdsMap) {
1005			List<OnDeviceIdsFetched> callbacks = this.fetchDeviceIdsMap.get(jid);
1006			if (callbacks != null) {
1007				if (callback != null) {
1008					callbacks.add(callback);
1009				}
1010				Log.d(Config.LOGTAG, account.getJid().asBareJid() + ": fetching device ids for " + jid + " already running. adding callback");
1011				packet = null;
1012			} else {
1013				callbacks = new ArrayList<>();
1014				if (callback != null) {
1015					callbacks.add(callback);
1016				}
1017				this.fetchDeviceIdsMap.put(jid, callbacks);
1018				Log.d(Config.LOGTAG, account.getJid().asBareJid() + ": fetching device ids for " + jid);
1019				packet = mXmppConnectionService.getIqGenerator().retrieveDeviceIds(jid);
1020			}
1021		}
1022		if (packet != null) {
1023			mXmppConnectionService.sendIqPacket(account, packet, (account, response) -> {
1024				synchronized (fetchDeviceIdsMap) {
1025					List<OnDeviceIdsFetched> callbacks = fetchDeviceIdsMap.remove(jid);
1026					if (response.getType() == IqPacket.TYPE.RESULT) {
1027						fetchDeviceListStatus.put(jid, true);
1028						Element item = mXmppConnectionService.getIqParser().getItem(response);
1029						Set<Integer> deviceIds = mXmppConnectionService.getIqParser().deviceIds(item);
1030						registerDevices(jid, deviceIds);
1031						if (callbacks != null) {
1032							for (OnDeviceIdsFetched c : callbacks) {
1033								c.fetched(jid, deviceIds);
1034							}
1035						}
1036					} else {
1037						if (response.getType() == IqPacket.TYPE.TIMEOUT) {
1038							fetchDeviceListStatus.remove(jid);
1039						} else {
1040							fetchDeviceListStatus.put(jid, false);
1041						}
1042						if (callbacks != null) {
1043							for (OnDeviceIdsFetched c : callbacks) {
1044								c.fetched(jid, null);
1045							}
1046						}
1047					}
1048				}
1049			});
1050		}
1051	}
1052
1053	private void fetchDeviceIds(List<Jid> jids, final OnMultipleDeviceIdFetched callback) {
1054		final ArrayList<Jid> unfinishedJids = new ArrayList<>(jids);
1055		synchronized (unfinishedJids) {
1056			for (Jid jid : unfinishedJids) {
1057				fetchDeviceIds(jid, (j, deviceIds) -> {
1058					synchronized (unfinishedJids) {
1059						unfinishedJids.remove(j);
1060						if (unfinishedJids.size() == 0 && callback != null) {
1061							callback.fetched();
1062						}
1063					}
1064				});
1065			}
1066		}
1067	}
1068
1069	private void buildSessionFromPEP(final SignalProtocolAddress address) {
1070		Log.i(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Building new session for " + address.toString());
1071		if (address.equals(getOwnAxolotlAddress())) {
1072			throw new AssertionError("We should NEVER build a session with ourselves. What happened here?!");
1073		}
1074
1075		final Jid jid = Jid.of(address.getName());
1076		final boolean oneOfOurs = jid.asBareJid().equals(account.getJid().asBareJid());
1077		IqPacket bundlesPacket = mXmppConnectionService.getIqGenerator().retrieveBundlesForDevice(jid, address.getDeviceId());
1078		mXmppConnectionService.sendIqPacket(account, bundlesPacket, (account, packet) -> {
1079			if (packet.getType() == IqPacket.TYPE.TIMEOUT) {
1080				fetchStatusMap.put(address, FetchStatus.TIMEOUT);
1081			} else if (packet.getType() == IqPacket.TYPE.RESULT) {
1082				Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Received preKey IQ packet, processing...");
1083				final IqParser parser = mXmppConnectionService.getIqParser();
1084				final List<PreKeyBundle> preKeyBundleList = parser.preKeys(packet);
1085				final PreKeyBundle bundle = parser.bundle(packet);
1086				if (preKeyBundleList.isEmpty() || bundle == null) {
1087					Log.e(Config.LOGTAG, AxolotlService.getLogprefix(account) + "preKey IQ packet invalid: " + packet);
1088					fetchStatusMap.put(address, FetchStatus.ERROR);
1089					finishBuildingSessionsFromPEP(address);
1090					return;
1091				}
1092				Random random = new Random();
1093				final PreKeyBundle preKey = preKeyBundleList.get(random.nextInt(preKeyBundleList.size()));
1094				if (preKey == null) {
1095					//should never happen
1096					fetchStatusMap.put(address, FetchStatus.ERROR);
1097					finishBuildingSessionsFromPEP(address);
1098					return;
1099				}
1100
1101				final PreKeyBundle preKeyBundle = new PreKeyBundle(0, address.getDeviceId(),
1102						preKey.getPreKeyId(), preKey.getPreKey(),
1103						bundle.getSignedPreKeyId(), bundle.getSignedPreKey(),
1104						bundle.getSignedPreKeySignature(), bundle.getIdentityKey());
1105
1106				try {
1107					SessionBuilder builder = new SessionBuilder(axolotlStore, address);
1108					builder.process(preKeyBundle);
1109					XmppAxolotlSession session = new XmppAxolotlSession(account, axolotlStore, address, bundle.getIdentityKey());
1110					sessions.put(address, session);
1111					if (Config.X509_VERIFICATION) {
1112						verifySessionWithPEP(session);
1113					} else {
1114						FingerprintStatus status = getFingerprintTrust(CryptoHelper.bytesToHex(bundle.getIdentityKey().getPublicKey().serialize()));
1115						FetchStatus fetchStatus;
1116						if (status != null && status.isVerified()) {
1117							fetchStatus = FetchStatus.SUCCESS_VERIFIED;
1118						} else if (status != null && status.isTrusted()) {
1119							fetchStatus = FetchStatus.SUCCESS_TRUSTED;
1120						} else {
1121							fetchStatus = FetchStatus.SUCCESS;
1122						}
1123						fetchStatusMap.put(address, fetchStatus);
1124						finishBuildingSessionsFromPEP(address);
1125					}
1126				} catch (UntrustedIdentityException | InvalidKeyException e) {
1127					Log.e(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Error building session for " + address + ": "
1128							+ e.getClass().getName() + ", " + e.getMessage());
1129					fetchStatusMap.put(address, FetchStatus.ERROR);
1130					finishBuildingSessionsFromPEP(address);
1131					if (oneOfOurs && cleanedOwnDeviceIds.add(address.getDeviceId())) {
1132						removeFromDeviceAnnouncement(address.getDeviceId());
1133					}
1134				}
1135			} else {
1136				fetchStatusMap.put(address, FetchStatus.ERROR);
1137				Element error = packet.findChild("error");
1138				boolean itemNotFound = error != null && error.hasChild("item-not-found");
1139				Log.d(Config.LOGTAG, getLogprefix(account) + "Error received while building session:" + packet.findChild("error"));
1140				finishBuildingSessionsFromPEP(address);
1141				if (oneOfOurs && itemNotFound && cleanedOwnDeviceIds.add(address.getDeviceId())) {
1142					removeFromDeviceAnnouncement(address.getDeviceId());
1143				}
1144			}
1145		});
1146	}
1147
1148	private void removeFromDeviceAnnouncement(Integer id) {
1149		HashSet<Integer> temp = new HashSet<>(getOwnDeviceIds());
1150		if (temp.remove(id)) {
1151			Log.d(Config.LOGTAG,account.getJid().asBareJid()+" remove own device id "+id+" from announcement. devices left:"+temp);
1152			publishOwnDeviceId(temp);
1153		}
1154	}
1155
1156	public Set<SignalProtocolAddress> findDevicesWithoutSession(final Conversation conversation) {
1157		Set<SignalProtocolAddress> addresses = new HashSet<>();
1158		for (Jid jid : getCryptoTargets(conversation)) {
1159			Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Finding devices without session for " + jid);
1160			if (deviceIds.get(jid) != null) {
1161				for (Integer foreignId : this.deviceIds.get(jid)) {
1162					SignalProtocolAddress address = new SignalProtocolAddress(jid.toString(), foreignId);
1163					if (sessions.get(address) == null) {
1164						IdentityKey identityKey = axolotlStore.loadSession(address).getSessionState().getRemoteIdentityKey();
1165						if (identityKey != null) {
1166							Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Already have session for " + address.toString() + ", adding to cache...");
1167							XmppAxolotlSession session = new XmppAxolotlSession(account, axolotlStore, address, identityKey);
1168							sessions.put(address, session);
1169						} else {
1170							Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Found device " + jid + ":" + foreignId);
1171							if (fetchStatusMap.get(address) != FetchStatus.ERROR) {
1172								addresses.add(address);
1173							} else {
1174								Log.d(Config.LOGTAG, getLogprefix(account) + "skipping over " + address + " because it's broken");
1175							}
1176						}
1177					}
1178				}
1179			} else {
1180				mXmppConnectionService.keyStatusUpdated(FetchStatus.ERROR);
1181				Log.w(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Have no target devices in PEP!");
1182			}
1183		}
1184		if (deviceIds.get(account.getJid().asBareJid()) != null) {
1185			for (Integer ownId : this.deviceIds.get(account.getJid().asBareJid())) {
1186				SignalProtocolAddress address = new SignalProtocolAddress(account.getJid().asBareJid().toString(), ownId);
1187				if (sessions.get(address) == null) {
1188					IdentityKey identityKey = axolotlStore.loadSession(address).getSessionState().getRemoteIdentityKey();
1189					if (identityKey != null) {
1190						Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Already have session for " + address.toString() + ", adding to cache...");
1191						XmppAxolotlSession session = new XmppAxolotlSession(account, axolotlStore, address, identityKey);
1192						sessions.put(address, session);
1193					} else {
1194						Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Found device " + account.getJid().asBareJid() + ":" + ownId);
1195						if (fetchStatusMap.get(address) != FetchStatus.ERROR) {
1196							addresses.add(address);
1197						} else {
1198							Log.d(Config.LOGTAG, getLogprefix(account) + "skipping over " + address + " because it's broken");
1199						}
1200					}
1201				}
1202			}
1203		}
1204
1205		return addresses;
1206	}
1207
1208	public boolean createSessionsIfNeeded(final Conversation conversation) {
1209		final List<Jid> jidsWithEmptyDeviceList = getCryptoTargets(conversation);
1210		for (Iterator<Jid> iterator = jidsWithEmptyDeviceList.iterator(); iterator.hasNext(); ) {
1211			final Jid jid = iterator.next();
1212			if (!hasEmptyDeviceList(jid)) {
1213				iterator.remove();
1214			}
1215		}
1216		Log.d(Config.LOGTAG, account.getJid().asBareJid() + ": createSessionsIfNeeded() - jids with empty device list: " + jidsWithEmptyDeviceList);
1217		if (jidsWithEmptyDeviceList.size() > 0) {
1218			fetchDeviceIds(jidsWithEmptyDeviceList, new OnMultipleDeviceIdFetched() {
1219				@Override
1220				public void fetched() {
1221					createSessionsIfNeededActual(conversation);
1222				}
1223			});
1224			return true;
1225		} else {
1226			return createSessionsIfNeededActual(conversation);
1227		}
1228	}
1229
1230	private boolean createSessionsIfNeededActual(final Conversation conversation) {
1231		Log.i(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Creating axolotl sessions if needed...");
1232		boolean newSessions = false;
1233		Set<SignalProtocolAddress> addresses = findDevicesWithoutSession(conversation);
1234		for (SignalProtocolAddress address : addresses) {
1235			Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Processing device: " + address.toString());
1236			FetchStatus status = fetchStatusMap.get(address);
1237			if (status == null || status == FetchStatus.TIMEOUT) {
1238				fetchStatusMap.put(address, FetchStatus.PENDING);
1239				this.buildSessionFromPEP(address);
1240				newSessions = true;
1241			} else if (status == FetchStatus.PENDING) {
1242				newSessions = true;
1243			} else {
1244				Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Already fetching bundle for " + address.toString());
1245			}
1246		}
1247
1248		return newSessions;
1249	}
1250
1251	public boolean trustedSessionVerified(final Conversation conversation) {
1252		final Set<XmppAxolotlSession> sessions = new HashSet<>();
1253		sessions.addAll(findSessionsForConversation(conversation));
1254		sessions.addAll(findOwnSessions());
1255		boolean verified = false;
1256		for (XmppAxolotlSession session : sessions) {
1257			if (session.getTrust().isTrustedAndActive()) {
1258				if (session.getTrust().getTrust() == FingerprintStatus.Trust.VERIFIED_X509) {
1259					verified = true;
1260				} else {
1261					return false;
1262				}
1263			}
1264		}
1265		return verified;
1266	}
1267
1268	public boolean hasPendingKeyFetches(List<Jid> jids) {
1269		SignalProtocolAddress ownAddress = new SignalProtocolAddress(account.getJid().asBareJid().toString(), 0);
1270		if (fetchStatusMap.getAll(ownAddress.getName()).containsValue(FetchStatus.PENDING)) {
1271			return true;
1272		}
1273		synchronized (this.fetchDeviceIdsMap) {
1274			for (Jid jid : jids) {
1275				SignalProtocolAddress foreignAddress = new SignalProtocolAddress(jid.asBareJid().toString(), 0);
1276				if (fetchStatusMap.getAll(foreignAddress.getName()).containsValue(FetchStatus.PENDING) || this.fetchDeviceIdsMap.containsKey(jid)) {
1277					return true;
1278				}
1279			}
1280		}
1281		return false;
1282	}
1283
1284	@Nullable
1285	private boolean buildHeader(XmppAxolotlMessage axolotlMessage, Conversation c) {
1286		Set<XmppAxolotlSession> remoteSessions = findSessionsForConversation(c);
1287		final boolean acceptEmpty = (c.getMode() == Conversation.MODE_MULTI && c.getMucOptions().getUserCount() == 0) || c.getContact().isSelf();
1288		Collection<XmppAxolotlSession> ownSessions = findOwnSessions();
1289		if (remoteSessions.isEmpty() && !acceptEmpty) {
1290			return false;
1291		}
1292		for (XmppAxolotlSession session : remoteSessions) {
1293			axolotlMessage.addDevice(session);
1294		}
1295		for (XmppAxolotlSession session : ownSessions) {
1296			axolotlMessage.addDevice(session);
1297		}
1298
1299		return true;
1300	}
1301
1302	//this is being used for private muc messages only
1303	private boolean buildHeader(XmppAxolotlMessage axolotlMessage, Jid jid) {
1304		if (jid == null) {
1305			return false;
1306		}
1307		HashSet<XmppAxolotlSession> sessions = new HashSet<>();
1308		sessions.addAll(this.sessions.getAll(getAddressForJid(jid).getName()).values());
1309		if (sessions.isEmpty()) {
1310			return false;
1311		}
1312		sessions.addAll(findOwnSessions());
1313		for(XmppAxolotlSession session : sessions) {
1314			axolotlMessage.addDevice(session);
1315		}
1316		return true;
1317	}
1318
1319	@Nullable
1320	public XmppAxolotlMessage encrypt(Message message) {
1321		final XmppAxolotlMessage axolotlMessage = new XmppAxolotlMessage(account.getJid().asBareJid(), getOwnDeviceId());
1322		final String content;
1323		if (message.hasFileOnRemoteHost()) {
1324			content = message.getFileParams().url.toString();
1325		} else {
1326			content = message.getBody();
1327		}
1328		try {
1329			axolotlMessage.encrypt(content);
1330		} catch (CryptoFailedException e) {
1331			Log.w(Config.LOGTAG, getLogprefix(account) + "Failed to encrypt message: " + e.getMessage());
1332			return null;
1333		}
1334
1335		final boolean success;
1336		if (message.getType() == Message.TYPE_PRIVATE) {
1337			success = buildHeader(axolotlMessage, message.getTrueCounterpart());
1338		} else {
1339			success = buildHeader(axolotlMessage, (Conversation) message.getConversation());
1340		}
1341		return success ? axolotlMessage : null;
1342	}
1343
1344	public void preparePayloadMessage(final Message message, final boolean delay) {
1345		executor.execute(new Runnable() {
1346			@Override
1347			public void run() {
1348				XmppAxolotlMessage axolotlMessage = encrypt(message);
1349				if (axolotlMessage == null) {
1350					mXmppConnectionService.markMessage(message, Message.STATUS_SEND_FAILED);
1351					//mXmppConnectionService.updateConversationUi();
1352				} else {
1353					Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Generated message, caching: " + message.getUuid());
1354					messageCache.put(message.getUuid(), axolotlMessage);
1355					mXmppConnectionService.resendMessage(message, delay);
1356				}
1357			}
1358		});
1359	}
1360
1361	public void prepareKeyTransportMessage(final Conversation conversation, final OnMessageCreatedCallback onMessageCreatedCallback) {
1362		executor.execute(new Runnable() {
1363			@Override
1364			public void run() {
1365				final XmppAxolotlMessage axolotlMessage = new XmppAxolotlMessage(account.getJid().asBareJid(), getOwnDeviceId());
1366				if (buildHeader(axolotlMessage, conversation)) {
1367					onMessageCreatedCallback.run(axolotlMessage);
1368				} else {
1369					onMessageCreatedCallback.run(null);
1370				}
1371			}
1372		});
1373	}
1374
1375	public XmppAxolotlMessage fetchAxolotlMessageFromCache(Message message) {
1376		XmppAxolotlMessage axolotlMessage = messageCache.get(message.getUuid());
1377		if (axolotlMessage != null) {
1378			Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Cache hit: " + message.getUuid());
1379			messageCache.remove(message.getUuid());
1380		} else {
1381			Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Cache miss: " + message.getUuid());
1382		}
1383		return axolotlMessage;
1384	}
1385
1386	private XmppAxolotlSession recreateUncachedSession(SignalProtocolAddress address) {
1387		IdentityKey identityKey = axolotlStore.loadSession(address).getSessionState().getRemoteIdentityKey();
1388		return (identityKey != null)
1389				? new XmppAxolotlSession(account, axolotlStore, address, identityKey)
1390				: null;
1391	}
1392
1393	private XmppAxolotlSession getReceivingSession(XmppAxolotlMessage message) {
1394		SignalProtocolAddress senderAddress = new SignalProtocolAddress(message.getFrom().toString(),
1395				message.getSenderDeviceId());
1396		XmppAxolotlSession session = sessions.get(senderAddress);
1397		if (session == null) {
1398			Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Account: " + account.getJid() + " No axolotl session found while parsing received message " + message);
1399			session = recreateUncachedSession(senderAddress);
1400			if (session == null) {
1401				session = new XmppAxolotlSession(account, axolotlStore, senderAddress);
1402			}
1403		}
1404		return session;
1405	}
1406
1407	public XmppAxolotlMessage.XmppAxolotlPlaintextMessage processReceivingPayloadMessage(XmppAxolotlMessage message, boolean postponePreKeyMessageHandling) throws NotEncryptedForThisDeviceException {
1408		XmppAxolotlMessage.XmppAxolotlPlaintextMessage plaintextMessage = null;
1409
1410		XmppAxolotlSession session = getReceivingSession(message);
1411		int ownDeviceId = getOwnDeviceId();
1412		try {
1413			plaintextMessage = message.decrypt(session, ownDeviceId);
1414			Integer preKeyId = session.getPreKeyIdAndReset();
1415			if (preKeyId != null) {
1416				postPreKeyMessageHandling(session, preKeyId, postponePreKeyMessageHandling);
1417			}
1418		} catch (NotEncryptedForThisDeviceException e) {
1419			if (account.getJid().asBareJid().equals(message.getFrom().asBareJid()) && message.getSenderDeviceId() == ownDeviceId) {
1420				Log.w(Config.LOGTAG, getLogprefix(account) + "Reflected omemo message received");
1421			} else {
1422				throw e;
1423			}
1424		} catch (CryptoFailedException e) {
1425			Log.w(Config.LOGTAG, getLogprefix(account) + "Failed to decrypt message from " + message.getFrom() + ": " + e.getMessage());
1426		}
1427
1428		if (session.isFresh() && plaintextMessage != null) {
1429			putFreshSession(session);
1430		}
1431
1432		return plaintextMessage;
1433	}
1434
1435	private void postPreKeyMessageHandling(final XmppAxolotlSession session, int preKeyId, final boolean postpone) {
1436		if (postpone) {
1437			postponedSessions.add(session);
1438		} else {
1439			//TODO: do not republish if we already removed this preKeyId
1440			publishBundlesIfNeeded(false, false);
1441			completeSession(session);
1442		}
1443	}
1444
1445	public void processPostponed() {
1446		if (postponedSessions.size() > 0) {
1447			publishBundlesIfNeeded(false, false);
1448		}
1449		Iterator<XmppAxolotlSession> iterator = postponedSessions.iterator();
1450		while (iterator.hasNext()) {
1451			completeSession(iterator.next());
1452			iterator.remove();
1453		}
1454	}
1455
1456	private void completeSession(XmppAxolotlSession session) {
1457		final XmppAxolotlMessage axolotlMessage = new XmppAxolotlMessage(account.getJid().asBareJid(), getOwnDeviceId());
1458		axolotlMessage.addDevice(session, true);
1459		try {
1460			Jid jid = Jid.of(session.getRemoteAddress().getName());
1461			MessagePacket packet = mXmppConnectionService.getMessageGenerator().generateKeyTransportMessage(jid, axolotlMessage);
1462			mXmppConnectionService.sendMessagePacket(account, packet);
1463		} catch (IllegalArgumentException e) {
1464			throw new Error("Remote addresses are created from jid and should convert back to jid", e);
1465		}
1466	}
1467
1468
1469	public XmppAxolotlMessage.XmppAxolotlKeyTransportMessage processReceivingKeyTransportMessage(XmppAxolotlMessage message, final boolean postponePreKeyMessageHandling) {
1470		XmppAxolotlMessage.XmppAxolotlKeyTransportMessage keyTransportMessage;
1471
1472		XmppAxolotlSession session = getReceivingSession(message);
1473		try {
1474			keyTransportMessage = message.getParameters(session, getOwnDeviceId());
1475			Integer preKeyId = session.getPreKeyIdAndReset();
1476			if (preKeyId != null) {
1477				postPreKeyMessageHandling(session, preKeyId, postponePreKeyMessageHandling);
1478			}
1479		} catch (CryptoFailedException e) {
1480			Log.d(Config.LOGTAG, "could not decrypt keyTransport message " + e.getMessage());
1481			keyTransportMessage = null;
1482		}
1483
1484		if (session.isFresh() && keyTransportMessage != null) {
1485			putFreshSession(session);
1486		}
1487
1488		return keyTransportMessage;
1489	}
1490
1491	private void putFreshSession(XmppAxolotlSession session) {
1492		Log.d(Config.LOGTAG, "put fresh session");
1493		sessions.put(session);
1494		if (Config.X509_VERIFICATION) {
1495			if (session.getIdentityKey() != null) {
1496				verifySessionWithPEP(session);
1497			} else {
1498				Log.e(Config.LOGTAG, account.getJid().asBareJid() + ": identity key was empty after reloading for x509 verification");
1499			}
1500		}
1501	}
1502}