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Conversations/src/main/java/eu/siacs/conversations/crypto/axolotl/AxolotlService.java

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package eu.siacs.conversations.crypto.axolotl;
import android.os.Bundle;
import android.security.KeyChain;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.util.Log;
import android.util.Pair;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.whispersystems.libsignal.SignalProtocolAddress;
import org.whispersystems.libsignal.IdentityKey;
import org.whispersystems.libsignal.IdentityKeyPair;
import org.whispersystems.libsignal.InvalidKeyException;
import org.whispersystems.libsignal.InvalidKeyIdException;
import org.whispersystems.libsignal.SessionBuilder;
import org.whispersystems.libsignal.UntrustedIdentityException;
import org.whispersystems.libsignal.ecc.ECPublicKey;
import org.whispersystems.libsignal.state.PreKeyBundle;
import org.whispersystems.libsignal.state.PreKeyRecord;
import org.whispersystems.libsignal.state.SignedPreKeyRecord;
import org.whispersystems.libsignal.util.KeyHelper;
import java.security.PrivateKey;
import java.security.Security;
import java.security.Signature;
import java.security.cert.X509Certificate;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Random;
import java.util.Set;
import java.util.concurrent.atomic.AtomicBoolean;
import eu.siacs.conversations.Config;
import eu.siacs.conversations.entities.Account;
import eu.siacs.conversations.entities.Contact;
import eu.siacs.conversations.entities.Conversation;
import eu.siacs.conversations.entities.Message;
import eu.siacs.conversations.parser.IqParser;
import eu.siacs.conversations.services.XmppConnectionService;
import eu.siacs.conversations.utils.CryptoHelper;
import eu.siacs.conversations.utils.SerialSingleThreadExecutor;
import eu.siacs.conversations.xml.Element;
import eu.siacs.conversations.xmpp.OnAdvancedStreamFeaturesLoaded;
import eu.siacs.conversations.xmpp.OnIqPacketReceived;
import eu.siacs.conversations.xmpp.jid.InvalidJidException;
import eu.siacs.conversations.xmpp.jid.Jid;
import eu.siacs.conversations.xmpp.stanzas.IqPacket;
public class AxolotlService implements OnAdvancedStreamFeaturesLoaded {
public static final String PEP_PREFIX = "eu.siacs.conversations.axolotl";
public static final String PEP_DEVICE_LIST = PEP_PREFIX + ".devicelist";
public static final String PEP_DEVICE_LIST_NOTIFY = PEP_DEVICE_LIST + "+notify";
public static final String PEP_BUNDLES = PEP_PREFIX + ".bundles";
public static final String PEP_VERIFICATION = PEP_PREFIX + ".verification";
public static final String LOGPREFIX = "AxolotlService";
public static final int NUM_KEYS_TO_PUBLISH = 100;
public static final int publishTriesThreshold = 3;
private final Account account;
private final XmppConnectionService mXmppConnectionService;
private final SQLiteAxolotlStore axolotlStore;
private final SessionMap sessions;
private final Map<Jid, Set<Integer>> deviceIds;
private final Map<String, XmppAxolotlMessage> messageCache;
private final FetchStatusMap fetchStatusMap;
private final SerialSingleThreadExecutor executor;
private int numPublishTriesOnEmptyPep = 0;
private boolean pepBroken = false;
private AtomicBoolean ownPushPending = new AtomicBoolean(false);
@Override
public void onAdvancedStreamFeaturesAvailable(Account account) {
if (Config.supportOmemo()
&& account.getXmppConnection() != null
&& account.getXmppConnection().getFeatures().pep()) {
publishBundlesIfNeeded(true, false);
} else {
Log.d(Config.LOGTAG,account.getJid().toBareJid()+": skipping OMEMO initialization");
}
}
public boolean fetchMapHasErrors(List<Jid> jids) {
for(Jid jid : jids) {
if (deviceIds.get(jid) != null) {
for (Integer foreignId : this.deviceIds.get(jid)) {
SignalProtocolAddress address = new SignalProtocolAddress(jid.toPreppedString(), foreignId);
if (fetchStatusMap.getAll(address.getName()).containsValue(FetchStatus.ERROR)) {
return true;
}
}
}
}
return false;
}
public void preVerifyFingerprint(Contact contact, String fingerprint) {
axolotlStore.preVerifyFingerprint(contact.getAccount(), contact.getJid().toBareJid().toPreppedString(), fingerprint);
}
public void preVerifyFingerprint(Account account, String fingerprint) {
axolotlStore.preVerifyFingerprint(account, account.getJid().toBareJid().toPreppedString(), fingerprint);
}
public boolean hasVerifiedKeys(String name) {
for(XmppAxolotlSession session : this.sessions.getAll(name).values()) {
if (session.getTrust().isVerified()) {
return true;
}
}
return false;
}
private static class AxolotlAddressMap<T> {
protected Map<String, Map<Integer, T>> map;
protected final Object MAP_LOCK = new Object();
public AxolotlAddressMap() {
this.map = new HashMap<>();
}
public void put(SignalProtocolAddress address, T value) {
synchronized (MAP_LOCK) {
Map<Integer, T> devices = map.get(address.getName());
if (devices == null) {
devices = new HashMap<>();
map.put(address.getName(), devices);
}
devices.put(address.getDeviceId(), value);
}
}
public T get(SignalProtocolAddress address) {
synchronized (MAP_LOCK) {
Map<Integer, T> devices = map.get(address.getName());
if (devices == null) {
return null;
}
return devices.get(address.getDeviceId());
}
}
public Map<Integer, T> getAll(String name) {
synchronized (MAP_LOCK) {
Map<Integer, T> devices = map.get(name);
if (devices == null) {
return new HashMap<>();
}
return devices;
}
}
public boolean hasAny(SignalProtocolAddress address) {
synchronized (MAP_LOCK) {
Map<Integer, T> devices = map.get(address.getName());
return devices != null && !devices.isEmpty();
}
}
public void clear() {
map.clear();
}
}
private static class SessionMap extends AxolotlAddressMap<XmppAxolotlSession> {
private final XmppConnectionService xmppConnectionService;
private final Account account;
public SessionMap(XmppConnectionService service, SQLiteAxolotlStore store, Account account) {
super();
this.xmppConnectionService = service;
this.account = account;
this.fillMap(store);
}
private void putDevicesForJid(String bareJid, List<Integer> deviceIds, SQLiteAxolotlStore store) {
for (Integer deviceId : deviceIds) {
SignalProtocolAddress axolotlAddress = new SignalProtocolAddress(bareJid, deviceId);
IdentityKey identityKey = store.loadSession(axolotlAddress).getSessionState().getRemoteIdentityKey();
if(Config.X509_VERIFICATION) {
X509Certificate certificate = store.getFingerprintCertificate(CryptoHelper.bytesToHex(identityKey.getPublicKey().serialize()));
if (certificate != null) {
Bundle information = CryptoHelper.extractCertificateInformation(certificate);
try {
final String cn = information.getString("subject_cn");
final Jid jid = Jid.fromString(bareJid);
Log.d(Config.LOGTAG,"setting common name for "+jid+" to "+cn);
account.getRoster().getContact(jid).setCommonName(cn);
} catch (final InvalidJidException ignored) {
//ignored
}
}
}
this.put(axolotlAddress, new XmppAxolotlSession(account, store, axolotlAddress, identityKey));
}
}
private void fillMap(SQLiteAxolotlStore store) {
List<Integer> deviceIds = store.getSubDeviceSessions(account.getJid().toBareJid().toPreppedString());
putDevicesForJid(account.getJid().toBareJid().toPreppedString(), deviceIds, store);
for (Contact contact : account.getRoster().getContacts()) {
Jid bareJid = contact.getJid().toBareJid();
String address = bareJid.toPreppedString();
deviceIds = store.getSubDeviceSessions(address);
putDevicesForJid(address, deviceIds, store);
}
}
@Override
public void put(SignalProtocolAddress address, XmppAxolotlSession value) {
super.put(address, value);
value.setNotFresh();
xmppConnectionService.syncRosterToDisk(account); //TODO why?
}
public void put(XmppAxolotlSession session) {
this.put(session.getRemoteAddress(), session);
}
}
public enum FetchStatus {
PENDING,
SUCCESS,
SUCCESS_VERIFIED,
TIMEOUT,
SUCCESS_TRUSTED,
ERROR
}
private static class FetchStatusMap extends AxolotlAddressMap<FetchStatus> {
public void clearErrorFor(Jid jid) {
synchronized (MAP_LOCK) {
Map<Integer, FetchStatus> devices = this.map.get(jid.toBareJid().toPreppedString());
if (devices == null) {
return;
}
for(Map.Entry<Integer, FetchStatus> entry : devices.entrySet()) {
if (entry.getValue() == FetchStatus.ERROR) {
Log.d(Config.LOGTAG,"resetting error for "+jid.toBareJid()+"("+entry.getKey()+")");
entry.setValue(FetchStatus.TIMEOUT);
}
}
}
}
}
public static String getLogprefix(Account account) {
return LOGPREFIX + " (" + account.getJid().toBareJid().toString() + "): ";
}
public AxolotlService(Account account, XmppConnectionService connectionService) {
if (Security.getProvider("BC") == null) {
Security.addProvider(new BouncyCastleProvider());
}
this.mXmppConnectionService = connectionService;
this.account = account;
this.axolotlStore = new SQLiteAxolotlStore(this.account, this.mXmppConnectionService);
this.deviceIds = new HashMap<>();
this.messageCache = new HashMap<>();
this.sessions = new SessionMap(mXmppConnectionService, axolotlStore, account);
this.fetchStatusMap = new FetchStatusMap();
this.executor = new SerialSingleThreadExecutor();
}
public String getOwnFingerprint() {
return CryptoHelper.bytesToHex(axolotlStore.getIdentityKeyPair().getPublicKey().serialize());
}
public Set<IdentityKey> getKeysWithTrust(FingerprintStatus status) {
return axolotlStore.getContactKeysWithTrust(account.getJid().toBareJid().toPreppedString(), status);
}
public Set<IdentityKey> getKeysWithTrust(FingerprintStatus status, Jid jid) {
return axolotlStore.getContactKeysWithTrust(jid.toBareJid().toPreppedString(), status);
}
public Set<IdentityKey> getKeysWithTrust(FingerprintStatus status, List<Jid> jids) {
Set<IdentityKey> keys = new HashSet<>();
for(Jid jid : jids) {
keys.addAll(axolotlStore.getContactKeysWithTrust(jid.toPreppedString(), status));
}
return keys;
}
public long getNumTrustedKeys(Jid jid) {
return axolotlStore.getContactNumTrustedKeys(jid.toBareJid().toPreppedString());
}
public boolean anyTargetHasNoTrustedKeys(List<Jid> jids) {
for(Jid jid : jids) {
if (axolotlStore.getContactNumTrustedKeys(jid.toBareJid().toPreppedString()) == 0) {
return true;
}
}
return false;
}
private SignalProtocolAddress getAddressForJid(Jid jid) {
return new SignalProtocolAddress(jid.toPreppedString(), 0);
}
public Collection<XmppAxolotlSession> findOwnSessions() {
SignalProtocolAddress ownAddress = getAddressForJid(account.getJid().toBareJid());
ArrayList<XmppAxolotlSession> s = new ArrayList<>(this.sessions.getAll(ownAddress.getName()).values());
Collections.sort(s);
return s;
}
public Collection<XmppAxolotlSession> findSessionsForContact(Contact contact) {
SignalProtocolAddress contactAddress = getAddressForJid(contact.getJid());
ArrayList<XmppAxolotlSession> s = new ArrayList<>(this.sessions.getAll(contactAddress.getName()).values());
Collections.sort(s);
return s;
}
private Set<XmppAxolotlSession> findSessionsForConversation(Conversation conversation) {
HashSet<XmppAxolotlSession> sessions = new HashSet<>();
for(Jid jid : conversation.getAcceptedCryptoTargets()) {
sessions.addAll(this.sessions.getAll(getAddressForJid(jid).getName()).values());
}
return sessions;
}
private boolean hasAny(Jid jid) {
return sessions.hasAny(getAddressForJid(jid));
}
public boolean isPepBroken() {
return this.pepBroken;
}
public void resetBrokenness() {
this.pepBroken = false;
numPublishTriesOnEmptyPep = 0;
}
public void clearErrorsInFetchStatusMap(Jid jid) {
fetchStatusMap.clearErrorFor(jid);
}
public void regenerateKeys(boolean wipeOther) {
axolotlStore.regenerate();
sessions.clear();
fetchStatusMap.clear();
publishBundlesIfNeeded(true, wipeOther);
}
public int getOwnDeviceId() {
return axolotlStore.getLocalRegistrationId();
}
public SignalProtocolAddress getOwnAxolotlAddress() {
return new SignalProtocolAddress(account.getJid().toBareJid().toPreppedString(),getOwnDeviceId());
}
public Set<Integer> getOwnDeviceIds() {
return this.deviceIds.get(account.getJid().toBareJid());
}
public void registerDevices(final Jid jid, @NonNull final Set<Integer> deviceIds) {
boolean me = jid.toBareJid().equals(account.getJid().toBareJid());
if (me && ownPushPending.getAndSet(false)) {
Log.d(Config.LOGTAG,account.getJid().toBareJid()+": ignoring own device update because of pending push");
return;
}
boolean needsPublishing = me && !deviceIds.contains(getOwnDeviceId());
if (me) {
deviceIds.remove(getOwnDeviceId());
}
Set<Integer> expiredDevices = new HashSet<>(axolotlStore.getSubDeviceSessions(jid.toBareJid().toPreppedString()));
expiredDevices.removeAll(deviceIds);
for (Integer deviceId : expiredDevices) {
SignalProtocolAddress address = new SignalProtocolAddress(jid.toBareJid().toPreppedString(), deviceId);
XmppAxolotlSession session = sessions.get(address);
if (session != null && session.getFingerprint() != null) {
if (session.getTrust().isActive()) {
session.setTrust(session.getTrust().toInactive());
}
}
}
Set<Integer> newDevices = new HashSet<>(deviceIds);
for (Integer deviceId : newDevices) {
SignalProtocolAddress address = new SignalProtocolAddress(jid.toBareJid().toPreppedString(), deviceId);
XmppAxolotlSession session = sessions.get(address);
if (session != null && session.getFingerprint() != null) {
if (!session.getTrust().isActive()) {
Log.d(Config.LOGTAG,"reactivating device with fingerprint "+session.getFingerprint());
session.setTrust(session.getTrust().toActive());
}
}
}
if (me) {
if (Config.OMEMO_AUTO_EXPIRY != 0) {
needsPublishing |= deviceIds.removeAll(getExpiredDevices());
}
for (Integer deviceId : deviceIds) {
SignalProtocolAddress ownDeviceAddress = new SignalProtocolAddress(jid.toBareJid().toPreppedString(), deviceId);
if (sessions.get(ownDeviceAddress) == null) {
FetchStatus status = fetchStatusMap.get(ownDeviceAddress);
if (status == null || status == FetchStatus.TIMEOUT) {
fetchStatusMap.put(ownDeviceAddress, FetchStatus.PENDING);
this.buildSessionFromPEP(ownDeviceAddress);
}
}
}
if (needsPublishing) {
publishOwnDeviceId(deviceIds);
}
}
this.deviceIds.put(jid, deviceIds);
mXmppConnectionService.updateConversationUi(); //update the lock icon
mXmppConnectionService.keyStatusUpdated(null);
}
public void wipeOtherPepDevices() {
if (pepBroken) {
Log.d(Config.LOGTAG, getLogprefix(account) + "wipeOtherPepDevices called, but PEP is broken. Ignoring... ");
return;
}
Set<Integer> deviceIds = new HashSet<>();
deviceIds.add(getOwnDeviceId());
IqPacket publish = mXmppConnectionService.getIqGenerator().publishDeviceIds(deviceIds);
Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Wiping all other devices from Pep:" + publish);
mXmppConnectionService.sendIqPacket(account, publish, null);
}
public void distrustFingerprint(final String fingerprint) {
final String fp = fingerprint.replaceAll("\\s", "");
final FingerprintStatus fingerprintStatus = axolotlStore.getFingerprintStatus(fp);
axolotlStore.setFingerprintStatus(fp,fingerprintStatus.toUntrusted());
}
public void publishOwnDeviceIdIfNeeded() {
if (pepBroken) {
Log.d(Config.LOGTAG, getLogprefix(account) + "publishOwnDeviceIdIfNeeded called, but PEP is broken. Ignoring... ");
return;
}
IqPacket packet = mXmppConnectionService.getIqGenerator().retrieveDeviceIds(account.getJid().toBareJid());
mXmppConnectionService.sendIqPacket(account, packet, new OnIqPacketReceived() {
@Override
public void onIqPacketReceived(Account account, IqPacket packet) {
if (packet.getType() == IqPacket.TYPE.TIMEOUT) {
Log.d(Config.LOGTAG, getLogprefix(account) + "Timeout received while retrieving own Device Ids.");
} else {
Element item = mXmppConnectionService.getIqParser().getItem(packet);
Set<Integer> deviceIds = mXmppConnectionService.getIqParser().deviceIds(item);
Log.d(Config.LOGTAG,account.getJid().toBareJid()+": retrieved own device list: "+deviceIds);
registerDevices(account.getJid().toBareJid(),deviceIds);
}
}
});
}
private Set<Integer> getExpiredDevices() {
Set<Integer> devices = new HashSet<>();
for(XmppAxolotlSession session : findOwnSessions()) {
if (session.getTrust().isActive()) {
long diff = System.currentTimeMillis() - session.getTrust().getLastActivation();
if (diff > Config.OMEMO_AUTO_EXPIRY) {
long lastMessageDiff = System.currentTimeMillis() - mXmppConnectionService.databaseBackend.getLastTimeFingerprintUsed(account,session.getFingerprint());
long hours = Math.round(lastMessageDiff/(1000*60.0*60.0));
if (lastMessageDiff > Config.OMEMO_AUTO_EXPIRY) {
devices.add(session.getRemoteAddress().getDeviceId());
session.setTrust(session.getTrust().toInactive());
Log.d(Config.LOGTAG,account.getJid().toBareJid()+": added own device " + session.getFingerprint() + " to list of expired devices. Last message received "+hours+" hours ago");
} else {
Log.d(Config.LOGTAG,account.getJid().toBareJid()+": own device "+session.getFingerprint()+" was active "+hours+" hours ago");
}
}
}
}
return devices;
}
public void publishOwnDeviceId(Set<Integer> deviceIds) {
Set<Integer> deviceIdsCopy = new HashSet<>(deviceIds);
Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "publishing own device ids");
if (deviceIdsCopy.isEmpty()) {
if (numPublishTriesOnEmptyPep >= publishTriesThreshold) {
Log.w(Config.LOGTAG, getLogprefix(account) + "Own device publish attempt threshold exceeded, aborting...");
pepBroken = true;
return;
} else {
numPublishTriesOnEmptyPep++;
Log.w(Config.LOGTAG, getLogprefix(account) + "Own device list empty, attempting to publish (try " + numPublishTriesOnEmptyPep + ")");
}
} else {
numPublishTriesOnEmptyPep = 0;
}
deviceIdsCopy.add(getOwnDeviceId());
IqPacket publish = mXmppConnectionService.getIqGenerator().publishDeviceIds(deviceIdsCopy);
ownPushPending.set(true);
mXmppConnectionService.sendIqPacket(account, publish, new OnIqPacketReceived() {
@Override
public void onIqPacketReceived(Account account, IqPacket packet) {
ownPushPending.set(false);
if (packet.getType() == IqPacket.TYPE.ERROR) {
pepBroken = true;
Log.d(Config.LOGTAG, getLogprefix(account) + "Error received while publishing own device id" + packet.findChild("error"));
}
}
});
}
public void publishDeviceVerificationAndBundle(final SignedPreKeyRecord signedPreKeyRecord,
final Set<PreKeyRecord> preKeyRecords,
final boolean announceAfter,
final boolean wipe) {
try {
IdentityKey axolotlPublicKey = axolotlStore.getIdentityKeyPair().getPublicKey();
PrivateKey x509PrivateKey = KeyChain.getPrivateKey(mXmppConnectionService, account.getPrivateKeyAlias());
X509Certificate[] chain = KeyChain.getCertificateChain(mXmppConnectionService, account.getPrivateKeyAlias());
Signature verifier = Signature.getInstance("sha256WithRSA");
verifier.initSign(x509PrivateKey,mXmppConnectionService.getRNG());
verifier.update(axolotlPublicKey.serialize());
byte[] signature = verifier.sign();
IqPacket packet = mXmppConnectionService.getIqGenerator().publishVerification(signature, chain, getOwnDeviceId());
Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + ": publish verification for device "+getOwnDeviceId());
mXmppConnectionService.sendIqPacket(account, packet, new OnIqPacketReceived() {
@Override
public void onIqPacketReceived(final Account account, IqPacket packet) {
String node = AxolotlService.PEP_VERIFICATION+":"+getOwnDeviceId();
Bundle pubsubOptions = new Bundle();
pubsubOptions.putString("pubsub#access_model","open");
mXmppConnectionService.pushNodeConfiguration(account, account.getJid().toBareJid(), node, pubsubOptions, new XmppConnectionService.OnConfigurationPushed() {
@Override
public void onPushSucceeded() {
Log.d(Config.LOGTAG,getLogprefix(account) + "configured verification node to be world readable");
publishDeviceBundle(signedPreKeyRecord, preKeyRecords, announceAfter, wipe);
}
@Override
public void onPushFailed() {
Log.d(Config.LOGTAG,getLogprefix(account) + "unable to set access model on verification node");
publishDeviceBundle(signedPreKeyRecord, preKeyRecords, announceAfter, wipe);
}
});
}
});
} catch (Exception e) {
e.printStackTrace();
}
}
public void publishBundlesIfNeeded(final boolean announce, final boolean wipe) {
if (pepBroken) {
Log.d(Config.LOGTAG, getLogprefix(account) + "publishBundlesIfNeeded called, but PEP is broken. Ignoring... ");
return;
}
IqPacket packet = mXmppConnectionService.getIqGenerator().retrieveBundlesForDevice(account.getJid().toBareJid(), getOwnDeviceId());
mXmppConnectionService.sendIqPacket(account, packet, new OnIqPacketReceived() {
@Override
public void onIqPacketReceived(Account account, IqPacket packet) {
if (packet.getType() == IqPacket.TYPE.TIMEOUT) {
return; //ignore timeout. do nothing
}
if (packet.getType() == IqPacket.TYPE.ERROR) {
Element error = packet.findChild("error");
if (error == null || !error.hasChild("item-not-found")) {
pepBroken = true;
Log.w(Config.LOGTAG, AxolotlService.getLogprefix(account) + "request for device bundles came back with something other than item-not-found" + packet);
return;
}
}
PreKeyBundle bundle = mXmppConnectionService.getIqParser().bundle(packet);
Map<Integer, ECPublicKey> keys = mXmppConnectionService.getIqParser().preKeyPublics(packet);
boolean flush = false;
if (bundle == null) {
Log.w(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Received invalid bundle:" + packet);
bundle = new PreKeyBundle(-1, -1, -1, null, -1, null, null, null);
flush = true;
}
if (keys == null) {
Log.w(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Received invalid prekeys:" + packet);
}
try {
boolean changed = false;
// Validate IdentityKey
IdentityKeyPair identityKeyPair = axolotlStore.getIdentityKeyPair();
if (flush || !identityKeyPair.getPublicKey().equals(bundle.getIdentityKey())) {
Log.i(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Adding own IdentityKey " + identityKeyPair.getPublicKey() + " to PEP.");
changed = true;
}
// Validate signedPreKeyRecord + ID
SignedPreKeyRecord signedPreKeyRecord;
int numSignedPreKeys = axolotlStore.getSignedPreKeysCount();
try {
signedPreKeyRecord = axolotlStore.loadSignedPreKey(bundle.getSignedPreKeyId());
if (flush
|| !bundle.getSignedPreKey().equals(signedPreKeyRecord.getKeyPair().getPublicKey())
|| !Arrays.equals(bundle.getSignedPreKeySignature(), signedPreKeyRecord.getSignature())) {
Log.i(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Adding new signedPreKey with ID " + (numSignedPreKeys + 1) + " to PEP.");
signedPreKeyRecord = KeyHelper.generateSignedPreKey(identityKeyPair, numSignedPreKeys + 1);
axolotlStore.storeSignedPreKey(signedPreKeyRecord.getId(), signedPreKeyRecord);
changed = true;
}
} catch (InvalidKeyIdException e) {
Log.i(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Adding new signedPreKey with ID " + (numSignedPreKeys + 1) + " to PEP.");
signedPreKeyRecord = KeyHelper.generateSignedPreKey(identityKeyPair, numSignedPreKeys + 1);
axolotlStore.storeSignedPreKey(signedPreKeyRecord.getId(), signedPreKeyRecord);
changed = true;
}
// Validate PreKeys
Set<PreKeyRecord> preKeyRecords = new HashSet<>();
if (keys != null) {
for (Integer id : keys.keySet()) {
try {
PreKeyRecord preKeyRecord = axolotlStore.loadPreKey(id);
if (preKeyRecord.getKeyPair().getPublicKey().equals(keys.get(id))) {
preKeyRecords.add(preKeyRecord);
}
} catch (InvalidKeyIdException ignored) {
}
}
}
int newKeys = NUM_KEYS_TO_PUBLISH - preKeyRecords.size();
if (newKeys > 0) {
List<PreKeyRecord> newRecords = KeyHelper.generatePreKeys(
axolotlStore.getCurrentPreKeyId() + 1, newKeys);
preKeyRecords.addAll(newRecords);
for (PreKeyRecord record : newRecords) {
axolotlStore.storePreKey(record.getId(), record);
}
changed = true;
Log.i(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Adding " + newKeys + " new preKeys to PEP.");
}
if (changed) {
if (account.getPrivateKeyAlias() != null && Config.X509_VERIFICATION) {
mXmppConnectionService.publishDisplayName(account);
publishDeviceVerificationAndBundle(signedPreKeyRecord, preKeyRecords, announce, wipe);
} else {
publishDeviceBundle(signedPreKeyRecord, preKeyRecords, announce, wipe);
}
} else {
Log.d(Config.LOGTAG, getLogprefix(account) + "Bundle " + getOwnDeviceId() + " in PEP was current");
if (wipe) {
wipeOtherPepDevices();
} else if (announce) {
Log.d(Config.LOGTAG, getLogprefix(account) + "Announcing device " + getOwnDeviceId());
publishOwnDeviceIdIfNeeded();
}
}
} catch (InvalidKeyException e) {
Log.e(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Failed to publish bundle " + getOwnDeviceId() + ", reason: " + e.getMessage());
}
}
});
}
private void publishDeviceBundle(SignedPreKeyRecord signedPreKeyRecord,
Set<PreKeyRecord> preKeyRecords,
final boolean announceAfter,
final boolean wipe) {
IqPacket publish = mXmppConnectionService.getIqGenerator().publishBundles(
signedPreKeyRecord, axolotlStore.getIdentityKeyPair().getPublicKey(),
preKeyRecords, getOwnDeviceId());
Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + ": Bundle " + getOwnDeviceId() + " in PEP not current. Publishing...");
mXmppConnectionService.sendIqPacket(account, publish, new OnIqPacketReceived() {
@Override
public void onIqPacketReceived(Account account, IqPacket packet) {
if (packet.getType() == IqPacket.TYPE.RESULT) {
Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Successfully published bundle. ");
if (wipe) {
wipeOtherPepDevices();
} else if (announceAfter) {
Log.d(Config.LOGTAG, getLogprefix(account) + "Announcing device " + getOwnDeviceId());
publishOwnDeviceIdIfNeeded();
}
} else if (packet.getType() == IqPacket.TYPE.ERROR) {
pepBroken = true;
Log.d(Config.LOGTAG, getLogprefix(account) + "Error received while publishing bundle: " + packet.findChild("error"));
}
}
});
}
public enum AxolotlCapability {
FULL,
MISSING_PRESENCE,
MISSING_KEYS,
WRONG_CONFIGURATION,
NO_MEMBERS
}
public boolean isConversationAxolotlCapable(Conversation conversation) {
return isConversationAxolotlCapableDetailed(conversation).first == AxolotlCapability.FULL;
}
public Pair<AxolotlCapability,Jid> isConversationAxolotlCapableDetailed(Conversation conversation) {
if (conversation.getMode() == Conversation.MODE_SINGLE
|| (conversation.getMucOptions().membersOnly() && conversation.getMucOptions().nonanonymous())) {
final List<Jid> jids = getCryptoTargets(conversation);
for(Jid jid : jids) {
if (!hasAny(jid) && (!deviceIds.containsKey(jid) || deviceIds.get(jid).isEmpty())) {
if (conversation.getAccount().getRoster().getContact(jid).mutualPresenceSubscription()) {
return new Pair<>(AxolotlCapability.MISSING_KEYS,jid);
} else {
return new Pair<>(AxolotlCapability.MISSING_PRESENCE,jid);
}
}
}
if (jids.size() > 0) {
return new Pair<>(AxolotlCapability.FULL, null);
} else {
return new Pair<>(AxolotlCapability.NO_MEMBERS, null);
}
} else {
return new Pair<>(AxolotlCapability.WRONG_CONFIGURATION, null);
}
}
public List<Jid> getCryptoTargets(Conversation conversation) {
final List<Jid> jids;
if (conversation.getMode() == Conversation.MODE_SINGLE) {
jids = Arrays.asList(conversation.getJid().toBareJid());
} else {
jids = conversation.getMucOptions().getMembers();
}
return jids;
}
public FingerprintStatus getFingerprintTrust(String fingerprint) {
return axolotlStore.getFingerprintStatus(fingerprint);
}
public X509Certificate getFingerprintCertificate(String fingerprint) {
return axolotlStore.getFingerprintCertificate(fingerprint);
}
public void setFingerprintTrust(String fingerprint, FingerprintStatus status) {
axolotlStore.setFingerprintStatus(fingerprint, status);
}
private void verifySessionWithPEP(final XmppAxolotlSession session) {
Log.d(Config.LOGTAG, "trying to verify fresh session (" + session.getRemoteAddress().getName() + ") with pep");
final SignalProtocolAddress address = session.getRemoteAddress();
final IdentityKey identityKey = session.getIdentityKey();
try {
IqPacket packet = mXmppConnectionService.getIqGenerator().retrieveVerificationForDevice(Jid.fromString(address.getName()), address.getDeviceId());
mXmppConnectionService.sendIqPacket(account, packet, new OnIqPacketReceived() {
@Override
public void onIqPacketReceived(Account account, IqPacket packet) {
Pair<X509Certificate[],byte[]> verification = mXmppConnectionService.getIqParser().verification(packet);
if (verification != null) {
try {
Signature verifier = Signature.getInstance("sha256WithRSA");
verifier.initVerify(verification.first[0]);
verifier.update(identityKey.serialize());
if (verifier.verify(verification.second)) {
try {
mXmppConnectionService.getMemorizingTrustManager().getNonInteractive().checkClientTrusted(verification.first, "RSA");
String fingerprint = session.getFingerprint();
Log.d(Config.LOGTAG, "verified session with x.509 signature. fingerprint was: "+fingerprint);
setFingerprintTrust(fingerprint, FingerprintStatus.createActiveVerified(true));
axolotlStore.setFingerprintCertificate(fingerprint, verification.first[0]);
fetchStatusMap.put(address, FetchStatus.SUCCESS_VERIFIED);
Bundle information = CryptoHelper.extractCertificateInformation(verification.first[0]);
try {
final String cn = information.getString("subject_cn");
final Jid jid = Jid.fromString(address.getName());
Log.d(Config.LOGTAG,"setting common name for "+jid+" to "+cn);
account.getRoster().getContact(jid).setCommonName(cn);
} catch (final InvalidJidException ignored) {
//ignored
}
finishBuildingSessionsFromPEP(address);
return;
} catch (Exception e) {
Log.d(Config.LOGTAG,"could not verify certificate");
}
}
} catch (Exception e) {
Log.d(Config.LOGTAG, "error during verification " + e.getMessage());
}
} else {
Log.d(Config.LOGTAG,"no verification found");
}
fetchStatusMap.put(address, FetchStatus.SUCCESS);
finishBuildingSessionsFromPEP(address);
}
});
} catch (InvalidJidException e) {
fetchStatusMap.put(address, FetchStatus.SUCCESS);
finishBuildingSessionsFromPEP(address);
}
}
private final Set<Integer> PREVIOUSLY_REMOVED_FROM_ANNOUNCEMENT = new HashSet<>();
private void finishBuildingSessionsFromPEP(final SignalProtocolAddress address) {
SignalProtocolAddress ownAddress = new SignalProtocolAddress(account.getJid().toBareJid().toPreppedString(), 0);
Map<Integer, FetchStatus> own = fetchStatusMap.getAll(ownAddress.getName());
Map<Integer, FetchStatus> remote = fetchStatusMap.getAll(address.getName());
if (!own.containsValue(FetchStatus.PENDING) && !remote.containsValue(FetchStatus.PENDING)) {
FetchStatus report = null;
if (own.containsValue(FetchStatus.SUCCESS) || remote.containsValue(FetchStatus.SUCCESS)) {
report = FetchStatus.SUCCESS;
} else if (own.containsValue(FetchStatus.SUCCESS_VERIFIED) || remote.containsValue(FetchStatus.SUCCESS_VERIFIED)) {
report = FetchStatus.SUCCESS_VERIFIED;
} else if (own.containsValue(FetchStatus.SUCCESS_TRUSTED) || remote.containsValue(FetchStatus.SUCCESS_TRUSTED)) {
report = FetchStatus.SUCCESS_TRUSTED;
} else if (own.containsValue(FetchStatus.ERROR) || remote.containsValue(FetchStatus.ERROR)) {
report = FetchStatus.ERROR;
}
mXmppConnectionService.keyStatusUpdated(report);
}
if (Config.REMOVE_BROKEN_DEVICES) {
Set<Integer> ownDeviceIds = new HashSet<>(getOwnDeviceIds());
boolean publish = false;
for (Map.Entry<Integer, FetchStatus> entry : own.entrySet()) {
int id = entry.getKey();
if (entry.getValue() == FetchStatus.ERROR && PREVIOUSLY_REMOVED_FROM_ANNOUNCEMENT.add(id) && ownDeviceIds.remove(id)) {
publish = true;
Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": error fetching own device with id " + id + ". removing from announcement");
}
}
if (publish) {
publishOwnDeviceId(ownDeviceIds);
}
}
}
public boolean hasEmptyDeviceList(Jid jid) {
return !hasAny(jid) && (!deviceIds.containsKey(jid) || deviceIds.get(jid).isEmpty());
}
public void fetchDeviceIds(final Jid jid) {
Log.d(Config.LOGTAG,"fetching device ids for "+jid);
IqPacket packet = mXmppConnectionService.getIqGenerator().retrieveDeviceIds(jid);
mXmppConnectionService.sendIqPacket(account, packet, new OnIqPacketReceived() {
@Override
public void onIqPacketReceived(Account account, IqPacket packet) {
if (packet.getType() == IqPacket.TYPE.RESULT) {
Element item = mXmppConnectionService.getIqParser().getItem(packet);
Set<Integer> deviceIds = mXmppConnectionService.getIqParser().deviceIds(item);
registerDevices(jid,deviceIds);
} else {
Log.d(Config.LOGTAG,packet.toString());
}
}
});
}
private void buildSessionFromPEP(final SignalProtocolAddress address) {
Log.i(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Building new session for " + address.toString());
if (address.equals(getOwnAxolotlAddress())) {
throw new AssertionError("We should NEVER build a session with ourselves. What happened here?!");
}
try {
IqPacket bundlesPacket = mXmppConnectionService.getIqGenerator().retrieveBundlesForDevice(
Jid.fromString(address.getName()), address.getDeviceId());
Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Retrieving bundle: " + bundlesPacket);
mXmppConnectionService.sendIqPacket(account, bundlesPacket, new OnIqPacketReceived() {
@Override
public void onIqPacketReceived(Account account, IqPacket packet) {
if (packet.getType() == IqPacket.TYPE.TIMEOUT) {
fetchStatusMap.put(address, FetchStatus.TIMEOUT);
} else if (packet.getType() == IqPacket.TYPE.RESULT) {
Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Received preKey IQ packet, processing...");
final IqParser parser = mXmppConnectionService.getIqParser();
final List<PreKeyBundle> preKeyBundleList = parser.preKeys(packet);
final PreKeyBundle bundle = parser.bundle(packet);
if (preKeyBundleList.isEmpty() || bundle == null) {
Log.e(Config.LOGTAG, AxolotlService.getLogprefix(account) + "preKey IQ packet invalid: " + packet);
fetchStatusMap.put(address, FetchStatus.ERROR);
finishBuildingSessionsFromPEP(address);
return;
}
Random random = new Random();
final PreKeyBundle preKey = preKeyBundleList.get(random.nextInt(preKeyBundleList.size()));
if (preKey == null) {
//should never happen
fetchStatusMap.put(address, FetchStatus.ERROR);
finishBuildingSessionsFromPEP(address);
return;
}
final PreKeyBundle preKeyBundle = new PreKeyBundle(0, address.getDeviceId(),
preKey.getPreKeyId(), preKey.getPreKey(),
bundle.getSignedPreKeyId(), bundle.getSignedPreKey(),
bundle.getSignedPreKeySignature(), bundle.getIdentityKey());
try {
SessionBuilder builder = new SessionBuilder(axolotlStore, address);
builder.process(preKeyBundle);
XmppAxolotlSession session = new XmppAxolotlSession(account, axolotlStore, address, bundle.getIdentityKey());
sessions.put(address, session);
if (Config.X509_VERIFICATION) {
verifySessionWithPEP(session);
} else {
FingerprintStatus status = getFingerprintTrust(CryptoHelper.bytesToHex(bundle.getIdentityKey().getPublicKey().serialize()));
FetchStatus fetchStatus;
if (status != null && status.isVerified()) {
fetchStatus = FetchStatus.SUCCESS_VERIFIED;
} else if (status != null && status.isTrusted()) {
fetchStatus = FetchStatus.SUCCESS_TRUSTED;
} else {
fetchStatus = FetchStatus.SUCCESS;
}
fetchStatusMap.put(address, fetchStatus);
finishBuildingSessionsFromPEP(address);
}
} catch (UntrustedIdentityException | InvalidKeyException e) {
Log.e(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Error building session for " + address + ": "
+ e.getClass().getName() + ", " + e.getMessage());
fetchStatusMap.put(address, FetchStatus.ERROR);
finishBuildingSessionsFromPEP(address);
}
} else {
fetchStatusMap.put(address, FetchStatus.ERROR);
Log.d(Config.LOGTAG, getLogprefix(account) + "Error received while building session:" + packet.findChild("error"));
finishBuildingSessionsFromPEP(address);
}
}
});
} catch (InvalidJidException e) {
Log.e(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Got address with invalid jid: " + address.getName());
}
}
public Set<SignalProtocolAddress> findDevicesWithoutSession(final Conversation conversation) {
Set<SignalProtocolAddress> addresses = new HashSet<>();
for(Jid jid : getCryptoTargets(conversation)) {
Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Finding devices without session for " + jid);
if (deviceIds.get(jid) != null) {
for (Integer foreignId : this.deviceIds.get(jid)) {
SignalProtocolAddress address = new SignalProtocolAddress(jid.toPreppedString(), foreignId);
if (sessions.get(address) == null) {
IdentityKey identityKey = axolotlStore.loadSession(address).getSessionState().getRemoteIdentityKey();
if (identityKey != null) {
Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Already have session for " + address.toString() + ", adding to cache...");
XmppAxolotlSession session = new XmppAxolotlSession(account, axolotlStore, address, identityKey);
sessions.put(address, session);
} else {
Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Found device " + jid + ":" + foreignId);
if (fetchStatusMap.get(address) != FetchStatus.ERROR) {
addresses.add(address);
} else {
Log.d(Config.LOGTAG, getLogprefix(account) + "skipping over " + address + " because it's broken");
}
}
}
}
} else {
Log.w(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Have no target devices in PEP!");
}
}
if (deviceIds.get(account.getJid().toBareJid()) != null) {
for (Integer ownId : this.deviceIds.get(account.getJid().toBareJid())) {
SignalProtocolAddress address = new SignalProtocolAddress(account.getJid().toBareJid().toPreppedString(), ownId);
if (sessions.get(address) == null) {
IdentityKey identityKey = axolotlStore.loadSession(address).getSessionState().getRemoteIdentityKey();
if (identityKey != null) {
Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Already have session for " + address.toString() + ", adding to cache...");
XmppAxolotlSession session = new XmppAxolotlSession(account, axolotlStore, address, identityKey);
sessions.put(address, session);
} else {
Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Found device " + account.getJid().toBareJid() + ":" + ownId);
if (fetchStatusMap.get(address) != FetchStatus.ERROR) {
addresses.add(address);
} else {
Log.d(Config.LOGTAG,getLogprefix(account)+"skipping over "+address+" because it's broken");
}
}
}
}
}
return addresses;
}
public boolean createSessionsIfNeeded(final Conversation conversation) {
Log.i(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Creating axolotl sessions if needed...");
boolean newSessions = false;
Set<SignalProtocolAddress> addresses = findDevicesWithoutSession(conversation);
for (SignalProtocolAddress address : addresses) {
Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Processing device: " + address.toString());
FetchStatus status = fetchStatusMap.get(address);
if (status == null || status == FetchStatus.TIMEOUT) {
fetchStatusMap.put(address, FetchStatus.PENDING);
this.buildSessionFromPEP(address);
newSessions = true;
} else if (status == FetchStatus.PENDING) {
newSessions = true;
} else {
Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Already fetching bundle for " + address.toString());
}
}
return newSessions;
}
public boolean trustedSessionVerified(final Conversation conversation) {
Set<XmppAxolotlSession> sessions = findSessionsForConversation(conversation);
sessions.addAll(findOwnSessions());
boolean verified = false;
for(XmppAxolotlSession session : sessions) {
if (session.getTrust().isTrustedAndActive()) {
if (session.getTrust().getTrust() == FingerprintStatus.Trust.VERIFIED_X509) {
verified = true;
} else {
return false;
}
}
}
return verified;
}
public boolean hasPendingKeyFetches(Account account, List<Jid> jids) {
SignalProtocolAddress ownAddress = new SignalProtocolAddress(account.getJid().toBareJid().toPreppedString(), 0);
if (fetchStatusMap.getAll(ownAddress.getName()).containsValue(FetchStatus.PENDING)) {
return true;
}
for(Jid jid : jids) {
SignalProtocolAddress foreignAddress = new SignalProtocolAddress(jid.toBareJid().toPreppedString(), 0);
if (fetchStatusMap.getAll(foreignAddress.getName()).containsValue(FetchStatus.PENDING)) {
return true;
}
}
return false;
}
@Nullable
private boolean buildHeader(XmppAxolotlMessage axolotlMessage, Conversation conversation) {
Set<XmppAxolotlSession> remoteSessions = findSessionsForConversation(conversation);
Collection<XmppAxolotlSession> ownSessions = findOwnSessions();
if (remoteSessions.isEmpty()) {
return false;
}
for (XmppAxolotlSession session : remoteSessions) {
axolotlMessage.addDevice(session);
}
for (XmppAxolotlSession session : ownSessions) {
axolotlMessage.addDevice(session);
}
return true;
}
@Nullable
public XmppAxolotlMessage encrypt(Message message) {
final XmppAxolotlMessage axolotlMessage = new XmppAxolotlMessage(account.getJid().toBareJid(), getOwnDeviceId());
final String content;
if (message.hasFileOnRemoteHost()) {
content = message.getFileParams().url.toString();
} else {
content = message.getBody();
}
try {
axolotlMessage.encrypt(content);
} catch (CryptoFailedException e) {
Log.w(Config.LOGTAG, getLogprefix(account) + "Failed to encrypt message: " + e.getMessage());
return null;
}
if (!buildHeader(axolotlMessage,message.getConversation())) {
return null;
}
return axolotlMessage;
}
public void preparePayloadMessage(final Message message, final boolean delay) {
executor.execute(new Runnable() {
@Override
public void run() {
XmppAxolotlMessage axolotlMessage = encrypt(message);
if (axolotlMessage == null) {
mXmppConnectionService.markMessage(message, Message.STATUS_SEND_FAILED);
//mXmppConnectionService.updateConversationUi();
} else {
Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Generated message, caching: " + message.getUuid());
messageCache.put(message.getUuid(), axolotlMessage);
mXmppConnectionService.resendMessage(message, delay);
}
}
});
}
public void prepareKeyTransportMessage(final Conversation conversation, final OnMessageCreatedCallback onMessageCreatedCallback) {
executor.execute(new Runnable() {
@Override
public void run() {
final XmppAxolotlMessage axolotlMessage = new XmppAxolotlMessage(account.getJid().toBareJid(), getOwnDeviceId());
if (buildHeader(axolotlMessage,conversation)) {
onMessageCreatedCallback.run(axolotlMessage);
} else {
onMessageCreatedCallback.run(null);
}
}
});
}
public XmppAxolotlMessage fetchAxolotlMessageFromCache(Message message) {
XmppAxolotlMessage axolotlMessage = messageCache.get(message.getUuid());
if (axolotlMessage != null) {
Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Cache hit: " + message.getUuid());
messageCache.remove(message.getUuid());
} else {
Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Cache miss: " + message.getUuid());
}
return axolotlMessage;
}
private XmppAxolotlSession recreateUncachedSession(SignalProtocolAddress address) {
IdentityKey identityKey = axolotlStore.loadSession(address).getSessionState().getRemoteIdentityKey();
return (identityKey != null)
? new XmppAxolotlSession(account, axolotlStore, address, identityKey)
: null;
}
private XmppAxolotlSession getReceivingSession(XmppAxolotlMessage message) {
SignalProtocolAddress senderAddress = new SignalProtocolAddress(message.getFrom().toPreppedString(),
message.getSenderDeviceId());
XmppAxolotlSession session = sessions.get(senderAddress);
if (session == null) {
Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Account: " + account.getJid() + " No axolotl session found while parsing received message " + message);
session = recreateUncachedSession(senderAddress);
if (session == null) {
session = new XmppAxolotlSession(account, axolotlStore, senderAddress);
}
}
return session;
}
public XmppAxolotlMessage.XmppAxolotlPlaintextMessage processReceivingPayloadMessage(XmppAxolotlMessage message) {
XmppAxolotlMessage.XmppAxolotlPlaintextMessage plaintextMessage = null;
XmppAxolotlSession session = getReceivingSession(message);
try {
plaintextMessage = message.decrypt(session, getOwnDeviceId());
Integer preKeyId = session.getPreKeyId();
if (preKeyId != null) {
publishBundlesIfNeeded(false, false);
session.resetPreKeyId();
}
} catch (CryptoFailedException e) {
Log.w(Config.LOGTAG, getLogprefix(account) + "Failed to decrypt message from "+message.getFrom()+": " + e.getMessage());
}
if (session.isFresh() && plaintextMessage != null) {
putFreshSession(session);
}
return plaintextMessage;
}
public XmppAxolotlMessage.XmppAxolotlKeyTransportMessage processReceivingKeyTransportMessage(XmppAxolotlMessage message) {
XmppAxolotlMessage.XmppAxolotlKeyTransportMessage keyTransportMessage;
XmppAxolotlSession session = getReceivingSession(message);
try {
keyTransportMessage = message.getParameters(session, getOwnDeviceId());
} catch (CryptoFailedException e) {
Log.d(Config.LOGTAG,"could not decrypt keyTransport message "+e.getMessage());
keyTransportMessage = null;
}
if (session.isFresh() && keyTransportMessage != null) {
putFreshSession(session);
}
return keyTransportMessage;
}
private void putFreshSession(XmppAxolotlSession session) {
Log.d(Config.LOGTAG,"put fresh session");
sessions.put(session);
if (Config.X509_VERIFICATION) {
if (session.getIdentityKey() != null) {
verifySessionWithPEP(session);
} else {
Log.e(Config.LOGTAG,account.getJid().toBareJid()+": identity key was empty after reloading for x509 verification");
}
}
}
}
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