Correctly handle deferred processing of key exchange message when locked.

src/org/thoughtcrime/securesms/crypto/DecryptingQueue.java

@@ -18,8 +18,10 @@ package org.thoughtcrime.securesms.crypto;
 
 import android.content.Context;
 import android.database.Cursor;
+import android.preference.PreferenceManager;
 import android.util.Log;
 
+import org.thoughtcrime.securesms.ApplicationPreferencesActivity;
 import org.thoughtcrime.securesms.database.DatabaseFactory;
 import org.thoughtcrime.securesms.database.EncryptingSmsDatabase;
 import org.thoughtcrime.securesms.database.MmsDatabase;
@@ -71,11 +73,11 @@ public class DecryptingQueue {
   }
 
   public static void scheduleDecryption(Context context, MasterSecret masterSecret,
-                                        long messageId, String originator, String body,
+                                        long messageId, long threadId, String originator,
-                                        boolean isSecureMessage)
+                                        String body, boolean isSecureMessage, boolean isKeyExchange)
   {
-    DecryptionWorkItem runnable = new DecryptionWorkItem(context, masterSecret, messageId,
+    DecryptionWorkItem runnable = new DecryptionWorkItem(context, masterSecret, messageId, threadId,
-                                                         originator, body, isSecureMessage);
+                                                         originator, body, isSecureMessage, isKeyExchange);
     synchronized (workQueue) {
       workQueue.add(runnable);
       workQueue.notifyAll();
@@ -122,11 +124,14 @@ public class DecryptingQueue {
                                                 SmsMessageRecord record)
   {
     long messageId          = record.getId();
+    long threadId           = record.getThreadId();
     String body             = record.getBody().getBody();
     String originator       = record.getIndividualRecipient().getNumber();
     boolean isSecureMessage = record.isSecure();
+    boolean isKeyExchange   = record.isKeyExchange();
 
-    scheduleDecryption(context, masterSecret, messageId,  originator, body, isSecureMessage);
+    scheduleDecryption(context, masterSecret, messageId,  threadId,
+                       originator, body, isSecureMessage, isKeyExchange);
   }
 
   private static class MmsDecryptionItem implements Runnable {
@@ -208,21 +213,25 @@ public class DecryptingQueue {
   private static class DecryptionWorkItem implements Runnable {
 
     private final long         messageId;
+    private final long         threadId;
     private final Context      context;
     private final MasterSecret masterSecret;
     private final String       body;
     private final String       originator;
     private final boolean      isSecureMessage;
+    private final boolean      isKeyExchange;
 
-    public DecryptionWorkItem(Context context, MasterSecret masterSecret, long messageId,
+    public DecryptionWorkItem(Context context, MasterSecret masterSecret, long messageId, long threadId,
-                              String originator, String body, boolean isSecureMessage)
+                              String originator, String body, boolean isSecureMessage, boolean isKeyExchange)
     {
       this.context         = context;
       this.messageId       = messageId;
+      this.threadId        = threadId;
       this.masterSecret    = masterSecret;
       this.body            = body;
       this.originator      = originator;
       this.isSecureMessage = isSecureMessage;
+      this.isKeyExchange   = isKeyExchange;
     }
 
     private void handleRemoteAsymmetricEncrypt() {
@@ -266,18 +275,47 @@ public class DecryptingQueue {
       try {
         AsymmetricMasterCipher asymmetricMasterCipher = new AsymmetricMasterCipher(MasterSecretUtil.getAsymmetricMasterSecret(context, masterSecret));
         plaintextBody                                 = asymmetricMasterCipher.decryptBody(body);
+
+        if (isKeyExchange) {
+          handleKeyExchangeProcessing(plaintextBody);
+        }
+
+        database.updateMessageBody(masterSecret, messageId, plaintextBody);
+        MessageNotifier.updateNotification(context, masterSecret);
       } catch (InvalidMessageException ime) {
         Log.w("DecryptionQueue", ime);
         database.markAsDecryptFailed(messageId);
-        return;
       } catch (IOException e) {
         Log.w("DecryptionQueue", e);
         database.markAsDecryptFailed(messageId);
-        return;
+      }
     }
 
-      database.updateMessageBody(masterSecret, messageId, plaintextBody);
+    private void handleKeyExchangeProcessing(String plaintxtBody) {
-      MessageNotifier.updateNotification(context, masterSecret);
+      if (PreferenceManager.getDefaultSharedPreferences(context)
+                           .getBoolean(ApplicationPreferencesActivity.AUTO_KEY_EXCHANGE_PREF, true))
+      {
+        try {
+          Recipient recipient                   = new Recipient(null, originator, null, null);
+          KeyExchangeMessage keyExchangeMessage = new KeyExchangeMessage(plaintxtBody);
+          KeyExchangeProcessor processor        = new KeyExchangeProcessor(context, masterSecret, recipient);
+
+          Log.w("DecryptingQuue", "KeyExchange with fingerprint: " + keyExchangeMessage.getPublicKey().getFingerprint());
+
+          if (processor.isStale(keyExchangeMessage)) {
+            DatabaseFactory.getEncryptingSmsDatabase(context).markAsStaleKeyExchange(messageId);
+          } else if (!processor.hasCompletedSession() ||
+                     processor.hasSameSessionIdentity(keyExchangeMessage))
+          {
+            DatabaseFactory.getEncryptingSmsDatabase(context).markAsProcessedKeyExchange(messageId);
+            processor.processKeyExchangeMessage(keyExchangeMessage, threadId);
+          }
+        } catch (InvalidVersionException e) {
+          Log.w("DecryptingQueue", e);
+        } catch (InvalidKeyException e) {
+          Log.w("DecryptingQueue", e);
+        }
+      }
     }
 
     @Override

src/org/thoughtcrime/securesms/database/SmsDatabase.java

@@ -139,6 +139,14 @@ public class SmsDatabase extends Database implements MmsSmsColumns {
     return 0;
   }
 
+  public void markAsStaleKeyExchange(long id) {
+    updateTypeBitmask(id, 0, Types.KEY_EXCHANGE_STALE_BIT);
+  }
+
+  public void markAsProcessedKeyExchange(long id) {
+    updateTypeBitmask(id, 0, Types.KEY_EXCHANGE_PROCESSED_BIT);
+  }
+
   public void markAsDecryptFailed(long id) {
     updateTypeBitmask(id, Types.ENCRYPTION_MASK, Types.ENCRYPTION_REMOTE_FAILED_BIT);
   }
@@ -213,7 +221,7 @@ public class SmsDatabase extends Database implements MmsSmsColumns {
     if (message.isKeyExchange()) {
       type |= Types.KEY_EXCHANGE_BIT;
       if      (((IncomingKeyExchangeMessage)message).isStale())     type |= Types.KEY_EXCHANGE_STALE_BIT;
-      else if (((IncomingKeyExchangeMessage)message).isProcessed()) {Log.w("SmsDatabase", "Setting processed bit..."); type |= Types.KEY_EXCHANGE_PROCESSED_BIT;}
+      else if (((IncomingKeyExchangeMessage)message).isProcessed()) type |= Types.KEY_EXCHANGE_PROCESSED_BIT;
     } else if (message.isSecureMessage()) {
       type |= Types.SECURE_MESSAGE_BIT;
       type |= Types.ENCRYPTION_REMOTE_BIT;

src/org/thoughtcrime/securesms/service/SmsReceiver.java

@@ -56,7 +56,9 @@ public class SmsReceiver {
   private IncomingTextMessage assembleMessageFragments(List<IncomingTextMessage> messages) {
     IncomingTextMessage message = new IncomingTextMessage(messages);
 
-    if (WirePrefix.isEncryptedMessage(message.getMessageBody()) || WirePrefix.isKeyExchange(message.getMessageBody())) {
+    if (WirePrefix.isEncryptedMessage(message.getMessageBody()) ||
+        WirePrefix.isKeyExchange(message.getMessageBody()))
+    {
       return multipartMessageHandler.processPotentialMultipartMessage(message);
     } else {
       return message;
@@ -69,8 +71,9 @@ public class SmsReceiver {
 
     if (masterSecret != null) {
       DecryptingQueue.scheduleDecryption(context, masterSecret, messageAndThreadId.first,
+                                         messageAndThreadId.second,
                                          message.getSender(), message.getMessageBody(),
-                                         message.isSecureMessage());
+                                         message.isSecureMessage(), message.isKeyExchange());
     }
 
     return messageAndThreadId;
@@ -92,7 +95,10 @@ public class SmsReceiver {
   private Pair<Long, Long> storeKeyExchangeMessage(MasterSecret masterSecret,
                                                    IncomingKeyExchangeMessage message)
   {
-    if (PreferenceManager.getDefaultSharedPreferences(context).getBoolean(ApplicationPreferencesActivity.AUTO_KEY_EXCHANGE_PREF, true)) {
+    if (masterSecret != null &&
+        PreferenceManager.getDefaultSharedPreferences(context)
+                         .getBoolean(ApplicationPreferencesActivity.AUTO_KEY_EXCHANGE_PREF, true))
+    {
       try {
         Recipient recipient                   = new Recipient(null, message.getSender(), null, null);
         KeyExchangeMessage keyExchangeMessage = new KeyExchangeMessage(message.getMessageBody());