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package de.pixart.messenger.crypto.axolotl;
import android.util.Log;
import android.util.LruCache;
import org.whispersystems.libsignal.IdentityKey;
import org.whispersystems.libsignal.IdentityKeyPair;
import org.whispersystems.libsignal.InvalidKeyIdException;
import org.whispersystems.libsignal.SignalProtocolAddress;
import org.whispersystems.libsignal.ecc.Curve;
import org.whispersystems.libsignal.ecc.ECKeyPair;
import org.whispersystems.libsignal.state.PreKeyRecord;
import org.whispersystems.libsignal.state.SessionRecord;
import org.whispersystems.libsignal.state.SignalProtocolStore;
import org.whispersystems.libsignal.state.SignedPreKeyRecord;
import org.whispersystems.libsignal.util.KeyHelper;
import java.security.cert.X509Certificate;
import java.util.List;
import java.util.Set;
import de.pixart.messenger.Config;
import de.pixart.messenger.entities.Account;
import de.pixart.messenger.services.XmppConnectionService;
import de.pixart.messenger.utils.CryptoHelper;
public class SQLiteAxolotlStore implements SignalProtocolStore {
public static final String PREKEY_TABLENAME = "prekeys";
public static final String SIGNED_PREKEY_TABLENAME = "signed_prekeys";
public static final String SESSION_TABLENAME = "sessions";
public static final String IDENTITIES_TABLENAME = "identities";
public static final String ACCOUNT = "account";
public static final String DEVICE_ID = "device_id";
public static final String ID = "id";
public static final String KEY = "key";
public static final String FINGERPRINT = "fingerprint";
public static final String NAME = "name";
public static final String TRUSTED = "trusted"; //no longer used
public static final String TRUST = "trust";
public static final String ACTIVE = "active";
public static final String LAST_ACTIVATION = "last_activation";
public static final String OWN = "ownkey";
public static final String CERTIFICATE = "certificate";
public static final String JSONKEY_REGISTRATION_ID = "axolotl_reg_id";
public static final String JSONKEY_CURRENT_PREKEY_ID = "axolotl_cur_prekey_id";
private static final int NUM_TRUSTS_TO_CACHE = 100;
private final Account account;
private final XmppConnectionService mXmppConnectionService;
private IdentityKeyPair identityKeyPair;
private int localRegistrationId;
private int currentPreKeyId = 0;
private final LruCache<String, FingerprintStatus> trustCache =
new LruCache<String, FingerprintStatus>(NUM_TRUSTS_TO_CACHE) {
@Override
protected FingerprintStatus create(String fingerprint) {
return mXmppConnectionService.databaseBackend.getFingerprintStatus(account, fingerprint);
}
};
private static IdentityKeyPair generateIdentityKeyPair() {
Log.i(Config.LOGTAG, AxolotlService.LOGPREFIX + " : " + "Generating axolotl IdentityKeyPair...");
ECKeyPair identityKeyPairKeys = Curve.generateKeyPair();
return new IdentityKeyPair(new IdentityKey(identityKeyPairKeys.getPublicKey()),
identityKeyPairKeys.getPrivateKey());
}
private static int generateRegistrationId() {
Log.i(Config.LOGTAG, AxolotlService.LOGPREFIX + " : " + "Generating axolotl registration ID...");
return KeyHelper.generateRegistrationId(true);
}
public SQLiteAxolotlStore(Account account, XmppConnectionService service) {
this.account = account;
this.mXmppConnectionService = service;
this.localRegistrationId = loadRegistrationId();
this.currentPreKeyId = loadCurrentPreKeyId();
}
public int getCurrentPreKeyId() {
return currentPreKeyId;
}
// --------------------------------------
// IdentityKeyStore
// --------------------------------------
private IdentityKeyPair loadIdentityKeyPair() {
synchronized (mXmppConnectionService) {
IdentityKeyPair ownKey = mXmppConnectionService.databaseBackend.loadOwnIdentityKeyPair(account);
if (ownKey != null) {
return ownKey;
} else {
Log.i(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Could not retrieve own IdentityKeyPair");
ownKey = generateIdentityKeyPair();
mXmppConnectionService.databaseBackend.storeOwnIdentityKeyPair(account, ownKey);
}
return ownKey;
}
}
private int loadRegistrationId() {
return loadRegistrationId(false);
}
private int loadRegistrationId(boolean regenerate) {
String regIdString = this.account.getKey(JSONKEY_REGISTRATION_ID);
int reg_id;
if (!regenerate && regIdString != null) {
reg_id = Integer.valueOf(regIdString);
} else {
Log.i(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Could not retrieve axolotl registration id for account " + account.getJid());
reg_id = generateRegistrationId();
boolean success = this.account.setKey(JSONKEY_REGISTRATION_ID, Integer.toString(reg_id));
if (success) {
mXmppConnectionService.databaseBackend.updateAccount(account);
} else {
Log.e(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Failed to write new key to the database!");
}
}
return reg_id;
}
private int loadCurrentPreKeyId() {
String prekeyIdString = this.account.getKey(JSONKEY_CURRENT_PREKEY_ID);
int prekey_id;
if (prekeyIdString != null) {
prekey_id = Integer.valueOf(prekeyIdString);
} else {
Log.w(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Could not retrieve current prekey id for account " + account.getJid());
prekey_id = 0;
}
return prekey_id;
}
public void regenerate() {
mXmppConnectionService.databaseBackend.wipeAxolotlDb(account);
trustCache.evictAll();
account.setKey(JSONKEY_CURRENT_PREKEY_ID, Integer.toString(0));
identityKeyPair = loadIdentityKeyPair();
localRegistrationId = loadRegistrationId(true);
currentPreKeyId = 0;
mXmppConnectionService.updateAccountUi();
}
/**
* Get the local client's identity key pair.
*
* @return The local client's persistent identity key pair.
*/
@Override
public IdentityKeyPair getIdentityKeyPair() {
if (identityKeyPair == null) {
identityKeyPair = loadIdentityKeyPair();
}
return identityKeyPair;
}
/**
* Return the local client's registration ID.
* <p/>
* Clients should maintain a registration ID, a random number
* between 1 and 16380 that's generated once at install time.
*
* @return the local client's registration ID.
*/
@Override
public int getLocalRegistrationId() {
return localRegistrationId;
}
/**
* Save a remote client's identity key
* <p/>
* Store a remote client's identity key as trusted.
*
* @param address The address of the remote client.
* @param identityKey The remote client's identity key.
* @return true on success
*/
@Override
public boolean saveIdentity(SignalProtocolAddress address, IdentityKey identityKey) {
if (!mXmppConnectionService.databaseBackend.loadIdentityKeys(account, address.getName()).contains(identityKey)) {
String fingerprint = CryptoHelper.bytesToHex(identityKey.getPublicKey().serialize());
FingerprintStatus status = getFingerprintStatus(fingerprint);
if (status == null) {
if (mXmppConnectionService.blindTrustBeforeVerification() && !account.getAxolotlService().hasVerifiedKeys(address.getName())) {
Log.d(Config.LOGTAG, account.getJid().asBareJid() + ": blindly trusted " + fingerprint + " of " + address.getName());
status = FingerprintStatus.createActiveTrusted();
} else {
status = FingerprintStatus.createActiveUndecided();
}
} else {
status = status.toActive();
}
mXmppConnectionService.databaseBackend.storeIdentityKey(account, address.getName(), identityKey, status);
trustCache.remove(fingerprint);
}
return true;
}
/**
* Verify a remote client's identity key.
* <p/>
* Determine whether a remote client's identity is trusted. Convention is
* that the TextSecure protocol is 'trust on first use.' This means that
* an identity key is considered 'trusted' if there is no entry for the recipient
* in the local store, or if it matches the saved key for a recipient in the local
* store. Only if it mismatches an entry in the local store is it considered
* 'untrusted.'
*
* @param name The name of the remote client.
* @param identityKey The identity key to verify.
* @return true if trusted, false if untrusted.
*/
@Override
public boolean isTrustedIdentity(SignalProtocolAddress address, IdentityKey identityKey, Direction direction) {
return true;
}
public FingerprintStatus getFingerprintStatus(String fingerprint) {
return (fingerprint == null) ? null : trustCache.get(fingerprint);
}
public void setFingerprintStatus(String fingerprint, FingerprintStatus status) {
mXmppConnectionService.databaseBackend.setIdentityKeyTrust(account, fingerprint, status);
trustCache.remove(fingerprint);
}
public void setFingerprintCertificate(String fingerprint, X509Certificate x509Certificate) {
mXmppConnectionService.databaseBackend.setIdentityKeyCertificate(account, fingerprint, x509Certificate);
}
public X509Certificate getFingerprintCertificate(String fingerprint) {
return mXmppConnectionService.databaseBackend.getIdentityKeyCertifcate(account, fingerprint);
}
public Set<IdentityKey> getContactKeysWithTrust(String bareJid, FingerprintStatus status) {
return mXmppConnectionService.databaseBackend.loadIdentityKeys(account, bareJid, status);
}
public long getContactNumTrustedKeys(String bareJid) {
return mXmppConnectionService.databaseBackend.numTrustedKeys(account, bareJid);
}
// --------------------------------------
// SessionStore
// --------------------------------------
/**
* Returns a copy of the {@link SessionRecord} corresponding to the recipientId + deviceId tuple,
* or a new SessionRecord if one does not currently exist.
* <p/>
* It is important that implementations return a copy of the current durable information. The
* returned SessionRecord may be modified, but those changes should not have an effect on the
* durable session state (what is returned by subsequent calls to this method) without the
* store method being called here first.
*
* @param address The name and device ID of the remote client.
* @return a copy of the SessionRecord corresponding to the recipientId + deviceId tuple, or
* a new SessionRecord if one does not currently exist.
*/
@Override
public SessionRecord loadSession(SignalProtocolAddress address) {
SessionRecord session = mXmppConnectionService.databaseBackend.loadSession(this.account, address);
return (session != null) ? session : new SessionRecord();
}
/**
* Returns all known devices with active sessions for a recipient
*
* @param name the name of the client.
* @return all known sub-devices with active sessions.
*/
@Override
public List<Integer> getSubDeviceSessions(String name) {
return mXmppConnectionService.databaseBackend.getSubDeviceSessions(account,
new SignalProtocolAddress(name, 0));
}
public List<String> getKnownAddresses() {
return mXmppConnectionService.databaseBackend.getKnownSignalAddresses(account);
}
/**
* Commit to storage the {@link SessionRecord} for a given recipientId + deviceId tuple.
*
* @param address the address of the remote client.
* @param record the current SessionRecord for the remote client.
*/
@Override
public void storeSession(SignalProtocolAddress address, SessionRecord record) {
mXmppConnectionService.databaseBackend.storeSession(account, address, record);
}
/**
* Determine whether there is a committed {@link SessionRecord} for a recipientId + deviceId tuple.
*
* @param address the address of the remote client.
* @return true if a {@link SessionRecord} exists, false otherwise.
*/
@Override
public boolean containsSession(SignalProtocolAddress address) {
return mXmppConnectionService.databaseBackend.containsSession(account, address);
}
/**
* Remove a {@link SessionRecord} for a recipientId + deviceId tuple.
*
* @param address the address of the remote client.
*/
@Override
public void deleteSession(SignalProtocolAddress address) {
mXmppConnectionService.databaseBackend.deleteSession(account, address);
}
/**
* Remove the {@link SessionRecord}s corresponding to all devices of a recipientId.
*
* @param name the name of the remote client.
*/
@Override
public void deleteAllSessions(String name) {
SignalProtocolAddress address = new SignalProtocolAddress(name, 0);
mXmppConnectionService.databaseBackend.deleteAllSessions(account,
address);
}
// --------------------------------------
// PreKeyStore
// --------------------------------------
/**
* Load a local PreKeyRecord.
*
* @param preKeyId the ID of the local PreKeyRecord.
* @return the corresponding PreKeyRecord.
* @throws InvalidKeyIdException when there is no corresponding PreKeyRecord.
*/
@Override
public PreKeyRecord loadPreKey(int preKeyId) throws InvalidKeyIdException {
PreKeyRecord record = mXmppConnectionService.databaseBackend.loadPreKey(account, preKeyId);
if (record == null) {
throw new InvalidKeyIdException("No such PreKeyRecord: " + preKeyId);
}
return record;
}
/**
* Store a local PreKeyRecord.
*
* @param preKeyId the ID of the PreKeyRecord to store.
* @param record the PreKeyRecord.
*/
@Override
public void storePreKey(int preKeyId, PreKeyRecord record) {
mXmppConnectionService.databaseBackend.storePreKey(account, record);
currentPreKeyId = preKeyId;
boolean success = this.account.setKey(JSONKEY_CURRENT_PREKEY_ID, Integer.toString(preKeyId));
if (success) {
mXmppConnectionService.databaseBackend.updateAccount(account);
} else {
Log.e(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Failed to write new prekey id to the database!");
}
}
/**
* @param preKeyId A PreKeyRecord ID.
* @return true if the store has a record for the preKeyId, otherwise false.
*/
@Override
public boolean containsPreKey(int preKeyId) {
return mXmppConnectionService.databaseBackend.containsPreKey(account, preKeyId);
}
/**
* Delete a PreKeyRecord from local storage.
*
* @param preKeyId The ID of the PreKeyRecord to remove.
*/
@Override
public void removePreKey(int preKeyId) {
mXmppConnectionService.databaseBackend.deletePreKey(account, preKeyId);
}
// --------------------------------------
// SignedPreKeyStore
// --------------------------------------
/**
* Load a local SignedPreKeyRecord.
*
* @param signedPreKeyId the ID of the local SignedPreKeyRecord.
* @return the corresponding SignedPreKeyRecord.
* @throws InvalidKeyIdException when there is no corresponding SignedPreKeyRecord.
*/
@Override
public SignedPreKeyRecord loadSignedPreKey(int signedPreKeyId) throws InvalidKeyIdException {
SignedPreKeyRecord record = mXmppConnectionService.databaseBackend.loadSignedPreKey(account, signedPreKeyId);
if (record == null) {
throw new InvalidKeyIdException("No such SignedPreKeyRecord: " + signedPreKeyId);
}
return record;
}
/**
* Load all local SignedPreKeyRecords.
*
* @return All stored SignedPreKeyRecords.
*/
@Override
public List<SignedPreKeyRecord> loadSignedPreKeys() {
return mXmppConnectionService.databaseBackend.loadSignedPreKeys(account);
}
public int getSignedPreKeysCount() {
return mXmppConnectionService.databaseBackend.getSignedPreKeysCount(account);
}
/**
* Store a local SignedPreKeyRecord.
*
* @param signedPreKeyId the ID of the SignedPreKeyRecord to store.
* @param record the SignedPreKeyRecord.
*/
@Override
public void storeSignedPreKey(int signedPreKeyId, SignedPreKeyRecord record) {
mXmppConnectionService.databaseBackend.storeSignedPreKey(account, record);
}
/**
* @param signedPreKeyId A SignedPreKeyRecord ID.
* @return true if the store has a record for the signedPreKeyId, otherwise false.
*/
@Override
public boolean containsSignedPreKey(int signedPreKeyId) {
return mXmppConnectionService.databaseBackend.containsSignedPreKey(account, signedPreKeyId);
}
/**
* Delete a SignedPreKeyRecord from local storage.
*
* @param signedPreKeyId The ID of the SignedPreKeyRecord to remove.
*/
@Override
public void removeSignedPreKey(int signedPreKeyId) {
mXmppConnectionService.databaseBackend.deleteSignedPreKey(account, signedPreKeyId);
}
public void preVerifyFingerprint(Account account, String name, String fingerprint) {
mXmppConnectionService.databaseBackend.storePreVerification(account, name, fingerprint, FingerprintStatus.createInactiveVerified());
}
}
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