session-android/src/org/thoughtcrime/securesms/ReceiveKeyActivity.java

270 lines
11 KiB
Java

/**
* 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 org.thoughtcrime.securesms;
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Context;
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 org.thoughtcrime.securesms.crypto.IdentityKeyParcelable;
import org.thoughtcrime.securesms.crypto.MasterSecret;
import org.thoughtcrime.securesms.crypto.storage.TextSecureIdentityKeyStore;
import org.thoughtcrime.securesms.database.DatabaseFactory;
import org.thoughtcrime.securesms.database.EncryptingSmsDatabase;
import org.thoughtcrime.securesms.database.IdentityDatabase;
import org.thoughtcrime.securesms.database.PushDatabase;
import org.thoughtcrime.securesms.jobs.PushDecryptJob;
import org.thoughtcrime.securesms.jobs.SmsDecryptJob;
import org.thoughtcrime.securesms.recipients.Recipient;
import org.thoughtcrime.securesms.sms.IncomingIdentityUpdateMessage;
import org.thoughtcrime.securesms.sms.IncomingKeyExchangeMessage;
import org.thoughtcrime.securesms.sms.IncomingPreKeyBundleMessage;
import org.thoughtcrime.securesms.sms.IncomingTextMessage;
import org.thoughtcrime.securesms.util.Base64;
import org.thoughtcrime.securesms.util.MemoryCleaner;
import org.whispersystems.libaxolotl.IdentityKey;
import org.whispersystems.libaxolotl.InvalidKeyException;
import org.whispersystems.libaxolotl.InvalidMessageException;
import org.whispersystems.libaxolotl.InvalidVersionException;
import org.whispersystems.libaxolotl.LegacyMessageException;
import org.whispersystems.libaxolotl.protocol.KeyExchangeMessage;
import org.whispersystems.libaxolotl.protocol.PreKeyWhisperMessage;
import org.whispersystems.libaxolotl.state.IdentityKeyStore;
import org.whispersystems.libaxolotl.util.guava.Optional;
import org.whispersystems.textsecure.api.messages.TextSecureEnvelope;
import org.whispersystems.textsecure.api.messages.TextSecureGroup;
import java.io.IOException;
/**
* 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 messageId;
private MasterSecret masterSecret;
private IncomingKeyExchangeMessage message;
private IdentityKey identityKey;
@Override
protected void onCreate(Bundle state) {
super.onCreate(state);
setContentView(R.layout.receive_key_activity);
initializeResources();
try {
initializeKey();
initializeText();
} catch (InvalidKeyException | InvalidVersionException | InvalidMessageException | LegacyMessageException ike) {
Log.w("ReceiveKeyActivity", ike);
}
initializeListeners();
}
@Override
protected void onDestroy() {
MemoryCleaner.clean(masterSecret);
super.onDestroy();
}
private void initializeText() {
if (isTrusted(this.identityKey)) {
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) {
Intent intent = new Intent(ReceiveKeyActivity.this, VerifyIdentityActivity.class);
intent.putExtra("recipient", recipient);
intent.putExtra("master_secret", masterSecret);
intent.putExtra("remote_identity", new IdentityKeyParcelable(identityKey));
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(IdentityKey identityKey) {
long recipientId = recipient.getRecipientId();
IdentityKeyStore identityKeyStore = new TextSecureIdentityKeyStore(this, masterSecret);
return identityKeyStore.isTrustedIdentity(recipientId, identityKey);
}
private void initializeKey()
throws InvalidKeyException, InvalidVersionException,
InvalidMessageException, LegacyMessageException
{
IncomingTextMessage message = new IncomingTextMessage(recipient.getNumber(),
recipientDeviceId,
System.currentTimeMillis(),
getIntent().getStringExtra("body"),
Optional.<TextSecureGroup>absent());
if (getIntent().getBooleanExtra("is_bundle", false)) {
this.message = new IncomingPreKeyBundleMessage(message, message.getMessageBody());
} else if (getIntent().getBooleanExtra("is_identity_update", false)) {
this.message = new IncomingIdentityUpdateMessage(message, message.getMessageBody());
} else {
this.message = new IncomingKeyExchangeMessage(message, message.getMessageBody());
}
this.identityKey = getIdentityKey(this.message);
}
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.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 IdentityKey getIdentityKey(IncomingKeyExchangeMessage message)
throws InvalidKeyException, InvalidVersionException,
InvalidMessageException, LegacyMessageException
{
try {
if (message.isIdentityUpdate()) {
return new IdentityKey(Base64.decodeWithoutPadding(message.getMessageBody()), 0);
} else if (message.isPreKeyBundle()) {
boolean isPush = getIntent().getBooleanExtra("is_push", false);
if (isPush) return new PreKeyWhisperMessage(Base64.decode(message.getMessageBody())).getIdentityKey();
else return new PreKeyWhisperMessage(Base64.decodeWithoutPadding(message.getMessageBody())).getIdentityKey();
} else {
return new KeyExchangeMessage(Base64.decodeWithoutPadding(message.getMessageBody())).getIdentityKey();
}
} catch (IOException e) {
throw new AssertionError(e);
}
}
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) {
Context context = ReceiveKeyActivity.this;
IdentityDatabase identityDatabase = DatabaseFactory.getIdentityDatabase(context);
EncryptingSmsDatabase smsDatabase = DatabaseFactory.getEncryptingSmsDatabase(context);
PushDatabase pushDatabase = DatabaseFactory.getPushDatabase(context);
identityDatabase.saveIdentity(masterSecret, recipient.getRecipientId(), identityKey);
if (message.isIdentityUpdate()) {
smsDatabase.markAsProcessedKeyExchange(messageId);
} else {
if (getIntent().getBooleanExtra("is_push", false)) {
try {
byte[] body = Base64.decode(message.getMessageBody());
TextSecureEnvelope envelope = new TextSecureEnvelope(3, message.getSender(),
message.getSenderDeviceId(), "",
message.getSentTimestampMillis(),
body);
long pushId = pushDatabase.insert(envelope);
ApplicationContext.getInstance(context)
.getJobManager()
.add(new PushDecryptJob(context, pushId));
smsDatabase.deleteMessage(messageId);
} catch (IOException e) {
throw new AssertionError(e);
}
} else {
ApplicationContext.getInstance(context)
.getJobManager()
.add(new SmsDecryptJob(context, 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();
}
}
}