/**
* Copyright (C) 2013 Open 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.transport;
import android.app.PendingIntent;
import android.content.Context;
import android.telephony.SmsManager;
import android.util.Log;
import com.securecomcode.text.database.model.SmsMessageRecord;
import com.securecomcode.text.recipients.Recipient;
import com.securecomcode.text.sms.MultipartSmsMessageHandler;
import com.securecomcode.text.sms.OutgoingPrekeyBundleMessage;
import com.securecomcode.text.sms.OutgoingTextMessage;
import com.securecomcode.text.sms.SmsTransportDetails;
import com.securecomcode.text.util.NumberUtil;
import com.securecomcode.text.util.TextSecurePreferences;
import org.whispersystems.textsecure.crypto.MasterSecret;
import org.whispersystems.textsecure.crypto.SessionCipher;
import org.whispersystems.textsecure.crypto.protocol.CiphertextMessage;
import org.whispersystems.textsecure.storage.RecipientDevice;
import org.whispersystems.textsecure.storage.Session;
import java.util.ArrayList;
public class SmsTransport extends BaseTransport {
private final Context context;
private final MasterSecret masterSecret;
public SmsTransport(Context context, MasterSecret masterSecret) {
this.context = context.getApplicationContext();
this.masterSecret = masterSecret;
}
public void deliver(SmsMessageRecord message) throws UndeliverableMessageException,
InsecureFallbackApprovalException
{
if (!NumberUtil.isValidSmsOrEmail(message.getIndividualRecipient().getNumber())) {
throw new UndeliverableMessageException("Not a valid SMS destination! " + message.getIndividualRecipient().getNumber());
}
if (message.isSecure() || message.isKeyExchange() || message.isEndSession()) {
deliverSecureMessage(message);
} else {
deliverPlaintextMessage(message);
}
}
private void deliverSecureMessage(SmsMessageRecord message) throws UndeliverableMessageException,
InsecureFallbackApprovalException
{
MultipartSmsMessageHandler multipartMessageHandler = new MultipartSmsMessageHandler();
OutgoingTextMessage transportMessage = OutgoingTextMessage.from(message);
if (message.isSecure() || message.isEndSession()) {
transportMessage = getAsymmetricEncrypt(masterSecret, transportMessage);
}
ArrayList<String> messages = multipartMessageHandler.divideMessage(transportMessage);
ArrayList<PendingIntent> sentIntents = constructSentIntents(message.getId(), message.getType(), messages, message.isSecure());
ArrayList<PendingIntent> deliveredIntents = constructDeliveredIntents(message.getId(), message.getType(), messages);
Log.w("SmsTransport", "Secure divide into message parts: " + messages.size());
for (int i=0;i<messages.size();i++) {
// XXX moxie@thoughtcrime.org 1/7/11 -- There's apparently a bug where for some unknown recipients
// and messages, this will throw an NPE. I have no idea why, so I'm just catching it and marking
// the message as a failure. That way at least it doesn't repeatedly crash every time you start
// the app.
// d3sre 12/10/13 -- extended the log file to further analyse the problem
try {
SmsManager.getDefault().sendTextMessage(message.getIndividualRecipient().getNumber(), null, messages.get(i),
sentIntents.get(i),
deliveredIntents == null ? null : deliveredIntents.get(i));
} catch (NullPointerException npe) {
Log.w("SmsTransport", npe);
Log.w("SmsTransport", "Recipient: " + message.getIndividualRecipient().getNumber());
Log.w("SmsTransport", "Message Total Parts/Current: " + messages.size() + "/" + i);
Log.w("SmsTransport", "Message Part Length: " + messages.get(i).getBytes().length);
throw new UndeliverableMessageException(npe);
} catch (IllegalArgumentException iae) {
Log.w("SmsTransport", iae);
throw new UndeliverableMessageException(iae);
}
}
}
private void deliverPlaintextMessage(SmsMessageRecord message)
throws UndeliverableMessageException
{
ArrayList<String> messages = SmsManager.getDefault().divideMessage(message.getBody().getBody());
ArrayList<PendingIntent> sentIntents = constructSentIntents(message.getId(), message.getType(), messages, false);
ArrayList<PendingIntent> deliveredIntents = constructDeliveredIntents(message.getId(), message.getType(), messages);
String recipient = message.getIndividualRecipient().getNumber();
// XXX moxie@thoughtcrime.org 1/7/11 -- There's apparently a bug where for some unknown recipients
// and messages, this will throw an NPE. I have no idea why, so I'm just catching it and marking
// the message as a failure. That way at least it doesn't repeatedly crash every time you start
// the app.
// d3sre 12/10/13 -- extended the log file to further analyse the problem
try {
SmsManager.getDefault().sendMultipartTextMessage(recipient, null, messages, sentIntents, deliveredIntents);
} catch (NullPointerException npe) {
Log.w("SmsTransport", npe);
Log.w("SmsTransport", "Recipient: " + recipient);
Log.w("SmsTransport", "Message Parts: " + messages.size());
try {
for (int i=0;i<messages.size();i++) {
SmsManager.getDefault().sendTextMessage(recipient, null, messages.get(i),
sentIntents.get(i),
deliveredIntents == null ? null : deliveredIntents.get(i));
}
} catch (NullPointerException npe2) {
Log.w("SmsTransport", npe);
throw new UndeliverableMessageException(npe2);
}
}
}
private ArrayList<PendingIntent> constructSentIntents(long messageId, long type,
ArrayList<String> messages, boolean secure)
{
ArrayList<PendingIntent> sentIntents = new ArrayList<PendingIntent>(messages.size());
for (String ignored : messages) {
sentIntents.add(PendingIntent.getBroadcast(context, 0,
constructSentIntent(context, messageId, type, secure, false),
0));
}
return sentIntents;
}
private ArrayList<PendingIntent> constructDeliveredIntents(long messageId, long type, ArrayList<String> messages) {
if (!TextSecurePreferences.isSmsDeliveryReportsEnabled(context)) {
return null;
}
ArrayList<PendingIntent> deliveredIntents = new ArrayList<PendingIntent>(messages.size());
for (String ignored : messages) {
deliveredIntents.add(PendingIntent.getBroadcast(context, 0,
constructDeliveredIntent(context, messageId, type),
0));
}
return deliveredIntents;
}
private OutgoingTextMessage getAsymmetricEncrypt(MasterSecret masterSecret,
OutgoingTextMessage message)
throws InsecureFallbackApprovalException
{
Recipient recipient = message.getRecipients().getPrimaryRecipient();
RecipientDevice recipientDevice = new RecipientDevice(recipient.getRecipientId(),
RecipientDevice.DEFAULT_DEVICE_ID);
if (!Session.hasEncryptCapableSession(context, masterSecret, recipient, recipientDevice)) {
throw new InsecureFallbackApprovalException("No session exists for this secure message.");
}
String body = message.getMessageBody();
SmsTransportDetails transportDetails = new SmsTransportDetails();
SessionCipher sessionCipher = SessionCipher.createFor(context, masterSecret, recipientDevice);
byte[] paddedPlaintext = transportDetails.getPaddedMessageBody(body.getBytes());
CiphertextMessage ciphertextMessage = sessionCipher.encrypt(paddedPlaintext);
String encodedCiphertext = new String(transportDetails.getEncodedMessage(ciphertextMessage.serialize()));
if (ciphertextMessage.getType() == CiphertextMessage.PREKEY_TYPE) {
message = new OutgoingPrekeyBundleMessage(message, encodedCiphertext);
} else {
message = message.withBody(encodedCiphertext);
}
return message;
}
}