/**
* Copyright (C) 2011 Whisper Systems
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package com.securecomcode.text;
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.text.SpannableString;
import android.text.Spanned;
import android.text.method.LinkMovementMethod;
import android.text.style.ClickableSpan;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import com.securecomcode.text.crypto.DecryptingQueue;
import com.securecomcode.text.crypto.KeyExchangeProcessor;
import com.securecomcode.text.crypto.KeyExchangeProcessorV2;
import com.securecomcode.text.crypto.protocol.KeyExchangeMessage;
import org.whispersystems.textsecure.crypto.LegacyMessageException;
import com.securecomcode.text.database.DatabaseFactory;
import com.securecomcode.text.recipients.Recipient;
import com.securecomcode.text.service.SendReceiveService;
import com.securecomcode.text.sms.SmsTransportDetails;
import com.securecomcode.text.util.MemoryCleaner;
import com.securecomcode.text.util.Util;
import org.whispersystems.textsecure.crypto.IdentityKey;
import org.whispersystems.textsecure.crypto.InvalidKeyException;
import org.whispersystems.textsecure.crypto.InvalidMessageException;
import org.whispersystems.textsecure.crypto.InvalidVersionException;
import org.whispersystems.textsecure.crypto.MasterSecret;
import org.whispersystems.textsecure.crypto.protocol.CiphertextMessage;
import org.whispersystems.textsecure.crypto.protocol.PreKeyWhisperMessage;
import org.whispersystems.textsecure.push.IncomingPushMessage;
import org.whispersystems.textsecure.storage.InvalidKeyIdException;
import org.whispersystems.textsecure.storage.RecipientDevice;
import org.whispersystems.textsecure.util.Base64;
import org.whispersystems.textsecure.util.InvalidNumberException;
import java.io.IOException;
import static org.whispersystems.textsecure.push.PushMessageProtos.IncomingPushMessageSignal.Type;
/**
* Activity for displaying sent/received session keys.
*
* @author Moxie Marlinspike
*/
public class ReceiveKeyActivity extends Activity {
private TextView descriptionText;
private Button confirmButton;
private Button cancelButton;
private Recipient recipient;
private int recipientDeviceId;
private long threadId;
private long messageId;
private MasterSecret masterSecret;
private PreKeyWhisperMessage keyExchangeMessageBundle;
private KeyExchangeMessage keyExchangeMessage;
private IdentityKey identityUpdateMessage;
@Override
protected void onCreate(Bundle state) {
super.onCreate(state);
setContentView(R.layout.receive_key_activity);
initializeResources();
try {
initializeKey();
initializeText();
} catch (InvalidKeyException ike) {
Log.w("ReceiveKeyActivity", ike);
} catch (InvalidVersionException ive) {
Log.w("ReceiveKeyActivity", ive);
} catch (InvalidMessageException e) {
Log.w("ReceiveKeyActivity", e);
} catch (LegacyMessageException e) {
Log.w("ReceiveKeyActivity", e);
}
initializeListeners();
}
@Override
protected void onDestroy() {
MemoryCleaner.clean(masterSecret);
super.onDestroy();
}
private void initializeText() {
if (isTrusted(keyExchangeMessage, keyExchangeMessageBundle, identityUpdateMessage)) {
initializeTrustedText();
} else {
initializeUntrustedText();
}
}
private void initializeTrustedText() {
descriptionText.setText(getString(R.string.ReceiveKeyActivity_the_signature_on_this_key_exchange_is_trusted_but));
}
private void initializeUntrustedText() {
SpannableString spannableString = new SpannableString(getString(R.string.ReceiveKeyActivity_the_signature_on_this_key_exchange_is_different) + " " +
getString(R.string.ReceiveKeyActivity_you_may_wish_to_verify_this_contact));
spannableString.setSpan(new ClickableSpan() {
@Override
public void onClick(View widget) {
IdentityKey remoteIdentity;
if (identityUpdateMessage != null) remoteIdentity = identityUpdateMessage;
else if (keyExchangeMessageBundle != null) remoteIdentity = keyExchangeMessageBundle.getIdentityKey();
else remoteIdentity = keyExchangeMessage.getIdentityKey();
Intent intent = new Intent(ReceiveKeyActivity.this, VerifyIdentityActivity.class);
intent.putExtra("recipient", recipient);
intent.putExtra("master_secret", masterSecret);
intent.putExtra("remote_identity", remoteIdentity);
startActivity(intent);
}
}, getString(R.string.ReceiveKeyActivity_the_signature_on_this_key_exchange_is_different).length() +1,
spannableString.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
descriptionText.setText(spannableString);
descriptionText.setMovementMethod(LinkMovementMethod.getInstance());
}
private boolean isTrusted(KeyExchangeMessage message, PreKeyWhisperMessage messageBundle, IdentityKey identityUpdateMessage) {
RecipientDevice recipientDevice = new RecipientDevice(recipient.getRecipientId(), recipientDeviceId);
if (message != null) {
KeyExchangeProcessor processor = KeyExchangeProcessor.createFor(this, masterSecret,
recipientDevice, message);
return processor.isTrusted(message);
} else if (messageBundle != null) {
KeyExchangeProcessorV2 processor = new KeyExchangeProcessorV2(this, masterSecret, recipientDevice);
return processor.isTrusted(messageBundle);
} else if (identityUpdateMessage != null) {
KeyExchangeProcessorV2 processor = new KeyExchangeProcessorV2(this, masterSecret, recipientDevice);
return processor.isTrusted(identityUpdateMessage);
}
return false;
}
private void initializeKey()
throws InvalidKeyException, InvalidVersionException,
InvalidMessageException, LegacyMessageException
{
try {
String messageBody = getIntent().getStringExtra("body");
if (getIntent().getBooleanExtra("is_bundle", false)) {
boolean isPush = getIntent().getBooleanExtra("is_push", false);
byte[] body;
if (isPush) {
body = Base64.decode(messageBody.getBytes());
} else {
body = new SmsTransportDetails().getDecodedMessage(messageBody.getBytes());
}
this.keyExchangeMessageBundle = new PreKeyWhisperMessage(body);
} else if (getIntent().getBooleanExtra("is_identity_update", false)) {
this.identityUpdateMessage = new IdentityKey(Base64.decodeWithoutPadding(messageBody), 0);
} else {
this.keyExchangeMessage = KeyExchangeMessage.createFor(messageBody);
}
} catch (IOException e) {
throw new AssertionError(e);
}
}
private void initializeResources() {
this.descriptionText = (TextView) findViewById(R.id.description_text);
this.confirmButton = (Button) findViewById(R.id.ok_button);
this.cancelButton = (Button) findViewById(R.id.cancel_button);
this.recipient = getIntent().getParcelableExtra("recipient");
this.recipientDeviceId = getIntent().getIntExtra("recipient_device_id", -1);
this.threadId = getIntent().getLongExtra("thread_id", -1);
this.messageId = getIntent().getLongExtra("message_id", -1);
this.masterSecret = getIntent().getParcelableExtra("master_secret");
}
private void initializeListeners() {
this.confirmButton.setOnClickListener(new OkListener());
this.cancelButton.setOnClickListener(new CancelListener());
}
private class OkListener implements View.OnClickListener {
@Override
public void onClick(View v) {
new AsyncTask<Void, Void, Void> () {
private ProgressDialog dialog;
@Override
protected void onPreExecute() {
dialog = ProgressDialog.show(ReceiveKeyActivity.this,
getString(R.string.ReceiveKeyActivity_processing),
getString(R.string.ReceiveKeyActivity_processing_key_exchange),
true);
}
@Override
protected Void doInBackground(Void... params) {
if (keyExchangeMessage != null) {
try {
RecipientDevice recipientDevice = new RecipientDevice(recipient.getRecipientId(), recipientDeviceId);
KeyExchangeProcessor processor = KeyExchangeProcessor.createFor(ReceiveKeyActivity.this, masterSecret, recipientDevice, keyExchangeMessage);
processor.processKeyExchangeMessage(keyExchangeMessage, threadId);
DatabaseFactory.getEncryptingSmsDatabase(ReceiveKeyActivity.this)
.markAsProcessedKeyExchange(messageId);
} catch (InvalidMessageException e) {
Log.w("ReceiveKeyActivity", e);
DatabaseFactory.getEncryptingSmsDatabase(ReceiveKeyActivity.this)
.markAsCorruptKeyExchange(messageId);
}
} else if (keyExchangeMessageBundle != null) {
try {
RecipientDevice recipientDevice = new RecipientDevice(recipient.getRecipientId(), recipientDeviceId);
KeyExchangeProcessorV2 processor = new KeyExchangeProcessorV2(ReceiveKeyActivity.this,
masterSecret, recipientDevice);
processor.processKeyExchangeMessage(keyExchangeMessageBundle);
CiphertextMessage bundledMessage = keyExchangeMessageBundle.getWhisperMessage();
if (getIntent().getBooleanExtra("is_push", false)) {
String source = Util.canonicalizeNumber(ReceiveKeyActivity.this, recipient.getNumber());
IncomingPushMessage incoming = new IncomingPushMessage(Type.CIPHERTEXT_VALUE, source, recipientDeviceId, bundledMessage.serialize(), System.currentTimeMillis());
DatabaseFactory.getEncryptingSmsDatabase(ReceiveKeyActivity.this)
.markAsProcessedKeyExchange(messageId);
Intent intent = new Intent(ReceiveKeyActivity.this, SendReceiveService.class);
intent.setAction(SendReceiveService.RECEIVE_PUSH_ACTION);
intent.putExtra("message", incoming);
startService(intent);
} else {
SmsTransportDetails transportDetails = new SmsTransportDetails();
String messageBody = new String(transportDetails.getEncodedMessage(bundledMessage.serialize()));
DatabaseFactory.getEncryptingSmsDatabase(ReceiveKeyActivity.this)
.updateBundleMessageBody(masterSecret, messageId, messageBody);
DecryptingQueue.scheduleDecryption(ReceiveKeyActivity.this, masterSecret, messageId,
threadId, recipient.getNumber(), recipientDeviceId,
messageBody, true, false, false);
}
} catch (InvalidKeyIdException e) {
Log.w("ReceiveKeyActivity", e);
DatabaseFactory.getEncryptingSmsDatabase(ReceiveKeyActivity.this)
.markAsCorruptKeyExchange(messageId);
} catch (InvalidKeyException e) {
Log.w("ReceiveKeyActivity", e);
DatabaseFactory.getEncryptingSmsDatabase(ReceiveKeyActivity.this)
.markAsCorruptKeyExchange(messageId);
} catch (InvalidNumberException e) {
Log.w("ReceiveKeyActivity", e);
DatabaseFactory.getEncryptingSmsDatabase(ReceiveKeyActivity.this)
.markAsCorruptKeyExchange(messageId);
}
} else if (identityUpdateMessage != null) {
DatabaseFactory.getIdentityDatabase(ReceiveKeyActivity.this)
.saveIdentity(masterSecret, recipient.getRecipientId(), identityUpdateMessage);
DatabaseFactory.getSmsDatabase(ReceiveKeyActivity.this).markAsProcessedKeyExchange(messageId);
}
return null;
}
@Override
protected void onPostExecute(Void result) {
dialog.dismiss();
finish();
}
}.execute();
}
}
private class CancelListener implements View.OnClickListener {
@Override
public void onClick(View v) {
ReceiveKeyActivity.this.finish();
}
}
}