TheArchive/session-android
1
0
Fork 0
mirror of https://github.com/oxen-io/session-android.git synced 2025-10-26 00:58:51 +00:00
Code Issues Packages Projects Releases Wiki Activity

Support encrypted transport, properly handle multiple recipients.

Browse Source 
1) Add encryption support for the transport layer.  This obscures
   metadata from the push messaging provider.

2) Better support the direction multiple destination messages is
   headed (one unique message per recipient).
This commit is contained in:
Moxie Marlinspike
2013-08-29 17:01:30 -07:00
parent 68ec0a3727
commit 0cc5837d7f
17 changed files with 1798 additions and 107 deletions
Download Patch File Download Diff File Expand all files Collapse all files

38
src/org/thoughtcrime/securesms/transport/PushTransport.java
View File

@@ -55,7 +55,7 @@ public class PushTransport extends BaseTransport {
String recipientCanonicalNumber = PhoneNumberFormatter.formatNumber(recipient.getNumber(),
localNumber);
Pair<Integer, String> typeAndCiphertext = getEncryptedMessage(socket, recipient, recipientCanonicalNumber, plaintext);
Pair<Integer, byte[]> typeAndCiphertext = getEncryptedMessage(socket, recipient, recipientCanonicalNumber, plaintext);
socket.sendMessage(recipientCanonicalNumber, typeAndCiphertext.second, typeAndCiphertext.first);
@@ -71,11 +71,19 @@ public class PushTransport extends BaseTransport {
String localNumber = TextSecurePreferences.getLocalNumber(context);
String password = TextSecurePreferences.getPushServerPassword(context);
PushServiceSocket socket = new PushServiceSocket(context, localNumber, password);
String messageText = PartParser.getMessageText(message.getBody());
byte[] messageText = PartParser.getMessageText(message.getBody()).getBytes();
List<PushAttachmentData> attachments = getAttachmentsFromBody(message.getBody());
if (attachments.isEmpty()) socket.sendMessage(destinations, messageText, OutgoingPushMessage.TYPE_MESSAGE_PLAINTEXT);
else socket.sendMessage(destinations, messageText, attachments, OutgoingPushMessage.TYPE_MESSAGE_PLAINTEXT);
List<byte[]> messagesList = new LinkedList<byte[]>();
List<List<PushAttachmentData>> attachmentsList = new LinkedList<List<PushAttachmentData>>();
for (String recipient : destinations) {
messagesList.add(messageText);
attachmentsList.add(attachments);
}
socket.sendMessage(destinations, messagesList, attachmentsList,
OutgoingPushMessage.TYPE_MESSAGE_PLAINTEXT);
} catch (RateLimitException e) {
Log.w("PushTransport", e);
throw new IOException("Rate limit exceeded.");
@@ -99,26 +107,26 @@ public class PushTransport extends BaseTransport {
return attachments;
}
private Pair<Integer, String> getEncryptedMessage(PushServiceSocket socket, Recipient recipient,
private Pair<Integer, byte[]> getEncryptedMessage(PushServiceSocket socket, Recipient recipient,
String canonicalRecipientNumber, String plaintext)
throws IOException
{
if (KeyUtil.isNonPrekeySessionFor(context, masterSecret, recipient)) {
Log.w("PushTransport", "Sending standard ciphertext message...");
String ciphertext = getEncryptedMessageForExistingSession(recipient, plaintext);
return new Pair<Integer, String>(OutgoingPushMessage.TYPE_MESSAGE_CIPHERTEXT, ciphertext);
byte[] ciphertext = getEncryptedMessageForExistingSession(recipient, plaintext);
return new Pair<Integer, byte[]>(OutgoingPushMessage.TYPE_MESSAGE_CIPHERTEXT, ciphertext);
} else if (KeyUtil.isSessionFor(context, recipient)) {
Log.w("PushTransport", "Sending prekeybundle ciphertext message for existing session...");
String ciphertext = getEncryptedPrekeyBundleMessageForExistingSession(recipient, plaintext);
return new Pair<Integer, String>(OutgoingPushMessage.TYPE_MESSAGE_PREKEY_BUNDLE, ciphertext);
byte[] ciphertext = getEncryptedPrekeyBundleMessageForExistingSession(recipient, plaintext);
return new Pair<Integer, byte[]>(OutgoingPushMessage.TYPE_MESSAGE_PREKEY_BUNDLE, ciphertext);
} else {
Log.w("PushTransport", "Sending prekeybundle ciphertext message for new session...");
String ciphertext = getEncryptedPrekeyBundleMessageForNewSession(socket, recipient, canonicalRecipientNumber, plaintext);
return new Pair<Integer, String>(OutgoingPushMessage.TYPE_MESSAGE_PREKEY_BUNDLE, ciphertext);
byte[] ciphertext = getEncryptedPrekeyBundleMessageForNewSession(socket, recipient, canonicalRecipientNumber, plaintext);
return new Pair<Integer, byte[]>(OutgoingPushMessage.TYPE_MESSAGE_PREKEY_BUNDLE, ciphertext);
}
}
private String getEncryptedPrekeyBundleMessageForExistingSession(Recipient recipient,
private byte[] getEncryptedPrekeyBundleMessageForExistingSession(Recipient recipient,
String plaintext)
{
IdentityKeyPair identityKeyPair = IdentityKeyUtil.getIdentityKeyPair(context, masterSecret);
@@ -131,7 +139,7 @@ public class PushTransport extends BaseTransport {
return preKeyBundleMessage.serialize();
}
private String getEncryptedPrekeyBundleMessageForNewSession(PushServiceSocket socket,
private byte[] getEncryptedPrekeyBundleMessageForNewSession(PushServiceSocket socket,
Recipient recipient,
String canonicalRecipientNumber,
String plaintext)
@@ -151,14 +159,14 @@ public class PushTransport extends BaseTransport {
return preKeyBundleMessage.serialize();
}
private String getEncryptedMessageForExistingSession(Recipient recipient, String plaintext)
private byte[] getEncryptedMessageForExistingSession(Recipient recipient, String plaintext)
throws IOException
{
IdentityKeyPair identityKeyPair = IdentityKeyUtil.getIdentityKeyPair(context, masterSecret);
MessageCipher messageCipher = new MessageCipher(context, masterSecret, identityKeyPair,
new PushTransportDetails());
return new String(messageCipher.encrypt(recipient, plaintext.getBytes()));
return messageCipher.encrypt(recipient, plaintext.getBytes());
}
}

3
src/org/thoughtcrime/securesms/transport/SmsTransport.java
View File

@@ -21,6 +21,7 @@ import org.thoughtcrime.securesms.sms.OutgoingTextMessage;
import org.thoughtcrime.securesms.sms.SmsTransportDetails;
import org.thoughtcrime.securesms.util.TextSecurePreferences;
import org.whispersystems.textsecure.crypto.protocol.PreKeyBundleMessage;
import org.whispersystems.textsecure.util.Base64;
import java.util.ArrayList;
@@ -160,7 +161,7 @@ public class SmsTransport extends BaseTransport {
byte[] bundledMessage = messageCipher.encrypt(recipient, body.getBytes());
PreKeyBundleMessage preKeyBundleMessage = new PreKeyBundleMessage(identityKey.getPublicKey(), bundledMessage);
return new OutgoingPrekeyBundleMessage(message, preKeyBundleMessage.serialize());
return new OutgoingPrekeyBundleMessage(message, Base64.encodeBytesWithoutPadding(preKeyBundleMessage.serialize()));
}
}
}