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package eu.siacs.conversations.crypto.axolotl;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.util.Log;
import org.whispersystems.libaxolotl.AxolotlAddress;
import org.whispersystems.libaxolotl.DuplicateMessageException;
import org.whispersystems.libaxolotl.IdentityKey;
import org.whispersystems.libaxolotl.InvalidKeyException;
import org.whispersystems.libaxolotl.InvalidKeyIdException;
import org.whispersystems.libaxolotl.InvalidMessageException;
import org.whispersystems.libaxolotl.InvalidVersionException;
import org.whispersystems.libaxolotl.LegacyMessageException;
import org.whispersystems.libaxolotl.NoSessionException;
import org.whispersystems.libaxolotl.SessionCipher;
import org.whispersystems.libaxolotl.UntrustedIdentityException;
import org.whispersystems.libaxolotl.protocol.CiphertextMessage;
import org.whispersystems.libaxolotl.protocol.PreKeyWhisperMessage;
import org.whispersystems.libaxolotl.protocol.WhisperMessage;
import java.util.HashMap;
import java.util.Map;
import eu.siacs.conversations.Config;
import eu.siacs.conversations.entities.Account;
public class XmppAxolotlSession {
private final SessionCipher cipher;
private final SQLiteAxolotlStore sqLiteAxolotlStore;
private final AxolotlAddress remoteAddress;
private final Account account;
private IdentityKey identityKey;
private Integer preKeyId = null;
private boolean fresh = true;
public enum Trust {
UNDECIDED(0),
TRUSTED(1),
UNTRUSTED(2),
COMPROMISED(3),
INACTIVE_TRUSTED(4),
INACTIVE_UNDECIDED(5),
INACTIVE_UNTRUSTED(6),
TRUSTED_X509(7),
INACTIVE_TRUSTED_X509(8);
private static final Map<Integer, Trust> trustsByValue = new HashMap<>();
static {
for (Trust trust : Trust.values()) {
trustsByValue.put(trust.getCode(), trust);
}
}
private final int code;
Trust(int code) {
this.code = code;
}
public int getCode() {
return this.code;
}
public String toString() {
switch (this) {
case UNDECIDED:
return "Trust undecided " + getCode();
case TRUSTED:
return "Trusted " + getCode();
case COMPROMISED:
return "Compromised " + getCode();
case INACTIVE_TRUSTED:
return "Inactive (Trusted)" + getCode();
case INACTIVE_UNDECIDED:
return "Inactive (Undecided)" + getCode();
case INACTIVE_UNTRUSTED:
return "Inactive (Untrusted)" + getCode();
case TRUSTED_X509:
return "Trusted (X509) " + getCode();
case INACTIVE_TRUSTED_X509:
return "Inactive (Trusted (X509)) " + getCode();
case UNTRUSTED:
default:
return "Untrusted " + getCode();
}
}
public static Trust fromBoolean(Boolean trusted) {
return trusted ? TRUSTED : UNTRUSTED;
}
public static Trust fromCode(int code) {
return trustsByValue.get(code);
}
public boolean trusted() {
return this == TRUSTED_X509 || this == TRUSTED;
}
public boolean trustedInactive() {
return this == INACTIVE_TRUSTED_X509 || this == INACTIVE_TRUSTED;
}
}
public XmppAxolotlSession(Account account, SQLiteAxolotlStore store, AxolotlAddress remoteAddress, IdentityKey identityKey) {
this(account, store, remoteAddress);
this.identityKey = identityKey;
}
public XmppAxolotlSession(Account account, SQLiteAxolotlStore store, AxolotlAddress remoteAddress) {
this.cipher = new SessionCipher(store, remoteAddress);
this.remoteAddress = remoteAddress;
this.sqLiteAxolotlStore = store;
this.account = account;
}
public Integer getPreKeyId() {
return preKeyId;
}
public void resetPreKeyId() {
preKeyId = null;
}
public String getFingerprint() {
return identityKey == null ? null : identityKey.getFingerprint().replaceAll("\\s", "");
}
public IdentityKey getIdentityKey() {
return identityKey;
}
public AxolotlAddress getRemoteAddress() {
return remoteAddress;
}
public boolean isFresh() {
return fresh;
}
public void setNotFresh() {
this.fresh = false;
}
protected void setTrust(Trust trust) {
sqLiteAxolotlStore.setFingerprintTrust(getFingerprint(), trust);
}
protected Trust getTrust() {
Trust trust = sqLiteAxolotlStore.getFingerprintTrust(getFingerprint());
return (trust == null) ? Trust.UNDECIDED : trust;
}
@Nullable
public byte[] processReceiving(byte[] encryptedKey) {
byte[] plaintext = null;
Trust trust = getTrust();
switch (trust) {
case INACTIVE_TRUSTED:
case UNDECIDED:
case UNTRUSTED:
case TRUSTED:
case INACTIVE_TRUSTED_X509:
case TRUSTED_X509:
try {
try {
PreKeyWhisperMessage message = new PreKeyWhisperMessage(encryptedKey);
Log.i(Config.LOGTAG, AxolotlService.getLogprefix(account) + "PreKeyWhisperMessage received, new session ID:" + message.getSignedPreKeyId() + "/" + message.getPreKeyId());
IdentityKey msgIdentityKey = message.getIdentityKey();
if (this.identityKey != null && !this.identityKey.equals(msgIdentityKey)) {
Log.e(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Had session with fingerprint " + this.getFingerprint() + ", received message with fingerprint " + msgIdentityKey.getFingerprint());
} else {
this.identityKey = msgIdentityKey;
plaintext = cipher.decrypt(message);
if (message.getPreKeyId().isPresent()) {
preKeyId = message.getPreKeyId().get();
}
}
} catch (InvalidMessageException | InvalidVersionException e) {
Log.i(Config.LOGTAG, AxolotlService.getLogprefix(account) + "WhisperMessage received");
WhisperMessage message = new WhisperMessage(encryptedKey);
plaintext = cipher.decrypt(message);
} catch (InvalidKeyException | InvalidKeyIdException | UntrustedIdentityException e) {
Log.w(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Error decrypting axolotl header, " + e.getClass().getName() + ": " + e.getMessage());
}
} catch (LegacyMessageException | InvalidMessageException | DuplicateMessageException | NoSessionException e) {
Log.w(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Error decrypting axolotl header, " + e.getClass().getName() + ": " + e.getMessage());
}
if (plaintext != null) {
if (trust == Trust.INACTIVE_TRUSTED) {
setTrust(Trust.TRUSTED);
} else if (trust == Trust.INACTIVE_TRUSTED_X509) {
setTrust(Trust.TRUSTED_X509);
}
}
break;
case COMPROMISED:
default:
// ignore
break;
}
return plaintext;
}
@Nullable
public byte[] processSending(@NonNull byte[] outgoingMessage) {
Trust trust = getTrust();
if (trust.trusted()) {
CiphertextMessage ciphertextMessage = cipher.encrypt(outgoingMessage);
return ciphertextMessage.serialize();
} else {
return null;
}
}
}
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