fix signal out of sync issue

CHANGELOG.md

@@ -6,9 +6,6 @@ Feature: Show link in chat if the saved media file contains one
 Improve: Verification badge for groups 
 Improve: Huge reduction in app size
 Fix: Crash on older devices when compressing a video
-
-## 0.0.94
-
 Fix: Problem with decrypting messages fixed
 
 ## 0.0.93

lib/src/model/protobuf/client/generated/messages.pbenum.dart

@@ -76,17 +76,21 @@ class EncryptedContent_ErrorMessages_Type extends $pb.ProtobufEnum {
   static const EncryptedContent_ErrorMessages_Type UNKNOWN_MESSAGE_TYPE =
       EncryptedContent_ErrorMessages_Type._(
           2, _omitEnumNames ? '' : 'UNKNOWN_MESSAGE_TYPE');
+  static const EncryptedContent_ErrorMessages_Type SESSION_OUT_OF_SYNC =
+      EncryptedContent_ErrorMessages_Type._(
+          3, _omitEnumNames ? '' : 'SESSION_OUT_OF_SYNC');
 
   static const $core.List<EncryptedContent_ErrorMessages_Type> values =
       <EncryptedContent_ErrorMessages_Type>[
     ERROR_PROCESSING_MESSAGE_CREATED_ACCOUNT_REQUEST_INSTEAD,
     UNKNOWN_MESSAGE_TYPE,
+    SESSION_OUT_OF_SYNC,
   ];
 
-  static final $core.Map<$core.int, EncryptedContent_ErrorMessages_Type>
-      _byValue = $pb.ProtobufEnum.initByValue(values);
+  static final $core.List<EncryptedContent_ErrorMessages_Type?> _byValue =
+      $pb.ProtobufEnum.$_initByValueList(values, 3);
   static EncryptedContent_ErrorMessages_Type? valueOf($core.int value) =>
-      _byValue[value];
+      value < 0 || value >= _byValue.length ? null : _byValue[value];
 
   const EncryptedContent_ErrorMessages_Type._(super.value, super.name);
 }

lib/src/model/protobuf/client/generated/messages.pbjson.dart

@@ -395,6 +395,7 @@ const EncryptedContent_ErrorMessages_Type$json = {
   '2': [
     {'1': 'ERROR_PROCESSING_MESSAGE_CREATED_ACCOUNT_REQUEST_INSTEAD', '2': 0},
     {'1': 'UNKNOWN_MESSAGE_TYPE', '2': 2},
+    {'1': 'SESSION_OUT_OF_SYNC', '2': 3},
   ],
 };
 
@@ -863,67 +864,68 @@ final $typed_data.Uint8List encryptedContentDescriptor = $convert.base64Decode(
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     'gLMicuRW5jcnlwdGVkQ29udGVudC5BZGRpdGlvbmFsRGF0YU1lc3NhZ2VIEVIVYWRkaXRpb25h'
-    'bERhdGFNZXNzYWdliAEBGtcBCg1FcnJvck1lc3NhZ2VzEjgKBHR5cGUYASABKA4yJC5FbmNyeX'
+    'bERhdGFNZXNzYWdliAEBGvABCg1FcnJvck1lc3NhZ2VzEjgKBHR5cGUYASABKA4yJC5FbmNyeX'
     'B0ZWRDb250ZW50LkVycm9yTWVzc2FnZXMuVHlwZVIEdHlwZRIsChJyZWxhdGVkX3JlY2VpcHRf'
-    'aWQYAiABKAlSEHJlbGF0ZWRSZWNlaXB0SWQiXgoEVHlwZRI8CjhFUlJPUl9QUk9DRVNTSU5HX0'
+    'aWQYAiABKAlSEHJlbGF0ZWRSZWNlaXB0SWQidwoEVHlwZRI8CjhFUlJPUl9QUk9DRVNTSU5HX0'
     '1FU1NBR0VfQ1JFQVRFRF9BQ0NPVU5UX1JFUVVFU1RfSU5TVEVBRBAAEhgKFFVOS05PV05fTUVT'
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+    'RDaGF0QhcKFV9zZW5kZXJQcm9maWxlQ291bnRlckIQCg5fbWVzc2FnZVVwZGF0ZUIICgZfbWVk'
+    'aWFCDgoMX21lZGlhVXBkYXRlQhAKDl9jb250YWN0VXBkYXRlQhEKD19jb250YWN0UmVxdWVzdE'
+    'IMCgpfZmxhbWVTeW5jQgsKCV9wdXNoS2V5c0ILCglfcmVhY3Rpb25CDgoMX3RleHRNZXNzYWdl'
+    'Qg4KDF9ncm91cENyZWF0ZUIMCgpfZ3JvdXBKb2luQg4KDF9ncm91cFVwZGF0ZUIXChVfcmVzZW'
+    '5kR3JvdXBQdWJsaWNLZXlCEQoPX2Vycm9yX21lc3NhZ2VzQhoKGF9hZGRpdGlvbmFsX2RhdGFf'
+    'bWVzc2FnZQ==');

lib/src/model/protobuf/client/messages.proto

@@ -58,6 +58,7 @@ message EncryptedContent {
         enum Type {
           ERROR_PROCESSING_MESSAGE_CREATED_ACCOUNT_REQUEST_INSTEAD = 0;
           UNKNOWN_MESSAGE_TYPE = 2;
+          SESSION_OUT_OF_SYNC = 3;
         }
         Type type = 1;
         string related_receipt_id = 2;

lib/src/services/api/client2client/errors.c2c.dart

@@ -3,14 +3,15 @@ import 'package:drift/drift.dart' show Value;
 import 'package:twonly/globals.dart';
 import 'package:twonly/src/database/twonly.db.dart';
 import 'package:twonly/src/model/protobuf/client/generated/messages.pbserver.dart';
+import 'package:twonly/src/utils/log.dart';
 
 Future<void> handleErrorMessage(
   int fromUserId,
   EncryptedContent_ErrorMessages error,
 ) async {
+  Log.error('Got error from $fromUserId: $error');
+
   switch (error.type) {
-    case EncryptedContent_ErrorMessages_Type.UNKNOWN_MESSAGE_TYPE:
-      break;
     case EncryptedContent_ErrorMessages_Type
           .ERROR_PROCESSING_MESSAGE_CREATED_ACCOUNT_REQUEST_INSTEAD:
       await twonlyDB.receiptsDao.updateReceiptWidthUserId(
@@ -25,5 +26,8 @@ Future<void> handleErrorMessage(
           requested: Value(true),
         ),
       );
+    // ignore: no_default_cases
+    default:
+      break;
   }
 }

lib/src/services/api/server_messages.dart

@@ -32,6 +32,7 @@ import 'package:twonly/src/utils/misc.dart';
 final lockHandleServerMessage = Mutex();
 
 Future<void> handleServerMessage(server.ServerToClient msg) async {
+  return lockHandleServerMessage.protect(() async {
     /// Returns means, that the server can delete the message from the server.
     final ok = client.Response_Ok()..none = true;
     var response = client.Response()..ok = ok;
@@ -61,9 +62,11 @@ Future<void> handleServerMessage(server.ServerToClient msg) async {
       ..response = response;
 
     await apiService.sendResponse(ClientToServer()..v0 = v0);
+  });
 }
 
 DateTime lastPushKeyRequest = clock.now().subtract(const Duration(hours: 1));
+bool alreadyPerformedAnResync = false;
 
 Mutex protectReceiptCheck = Mutex();
 

lib/src/services/api/utils.dart

@@ -84,7 +84,7 @@ Future<void> handleMediaError(MediaFile media) async {
 Future<void> importSignalContactAndCreateRequest(
   server.Response_UserData userdata,
 ) async {
-  if (await createNewSignalSession(userdata)) {
+  if (await processSignalUserData(userdata)) {
     // 1. Setup notifications keys with the other user
     await setupNotificationWithUsers(
       forceContact: userdata.userId.toInt(),

lib/src/services/group.services.dart

@@ -472,7 +472,7 @@ Future<bool> addNewHiddenContact(int contactId) async {
           const Value(true), // this will hide the contact in the contact list
     ),
   );
-  await createNewSignalSession(userData);
+  await processSignalUserData(userData);
   unawaited(setupNotificationWithUsers(forceContact: contactId));
   return true;
 }

lib/src/services/signal/encryption.signal.dart

@@ -1,9 +1,12 @@
 import 'dart:typed_data';
 
 import 'package:libsignal_protocol_dart/libsignal_protocol_dart.dart';
+// ignore: implementation_imports
+import 'package:libsignal_protocol_dart/src/invalid_message_exception.dart';
 import 'package:mutex/mutex.dart';
 import 'package:twonly/src/model/protobuf/client/generated/messages.pb.dart';
-import 'package:twonly/src/services/signal/consts.signal.dart';
+import 'package:twonly/src/services/api/messages.dart';
+import 'package:twonly/src/services/signal/session.signal.dart';
 import 'package:twonly/src/services/signal/utils.signal.dart';
 import 'package:twonly/src/utils/log.dart';
 
@@ -17,7 +20,7 @@ Future<CiphertextMessage?> signalEncryptMessage(
   return lockingSignalEncryption.protect<CiphertextMessage?>(() async {
     try {
       final signalStore = (await getSignalStore())!;
-      final address = SignalProtocolAddress(target.toString(), defaultDeviceId);
+      final address = getSignalAddress(target);
       final session = SessionCipher.fromStore(signalStore, address);
       return await session.encrypt(plaintextContent);
     } catch (e) {
@@ -27,16 +30,18 @@ Future<CiphertextMessage?> signalEncryptMessage(
   });
 }
 
+bool alreadyPerformedAnResync = false;
+
 Future<(EncryptedContent?, PlaintextContent_DecryptionErrorMessage_Type?)>
     signalDecryptMessage(
-  int source,
+  int fromUserId,
   Uint8List encryptedContentRaw,
   int type,
 ) async {
   try {
     final session = SessionCipher.fromStore(
       (await getSignalStore())!,
-      SignalProtocolAddress(source.toString(), defaultDeviceId),
+      getSignalAddress(fromUserId),
     );
 
     Uint8List plaintext;
@@ -59,6 +64,26 @@ Future<(EncryptedContent?, PlaintextContent_DecryptionErrorMessage_Type?)>
   } on InvalidKeyIdException catch (e) {
     Log.warn(e);
     return (null, PlaintextContent_DecryptionErrorMessage_Type.PREKEY_UNKNOWN);
+  } on InvalidMessageException catch (e) {
+    if (!alreadyPerformedAnResync) {
+      if (await handleSessionResync(fromUserId)) {
+        // This flag prevents from resyncing the session the client received multiple new
+        // messages from the server he could not decrypt
+        alreadyPerformedAnResync = true;
+
+        // This message contains a new PreKeyBundle establishing a new signal session
+        await sendCipherText(
+          fromUserId,
+          EncryptedContent(
+            errorMessages: EncryptedContent_ErrorMessages(
+              type: EncryptedContent_ErrorMessages_Type.SESSION_OUT_OF_SYNC,
+            ),
+          ),
+        );
+      }
+    }
+    Log.warn(e);
+    return (null, PlaintextContent_DecryptionErrorMessage_Type.UNKNOWN);
   } catch (e) {
     Log.error(e);
     return (null, PlaintextContent_DecryptionErrorMessage_Type.UNKNOWN);

lib/src/services/signal/session.signal.dart

@@ -6,17 +6,14 @@ import 'package:twonly/src/services/signal/consts.signal.dart';
 import 'package:twonly/src/services/signal/utils.signal.dart';
 import 'package:twonly/src/utils/log.dart';
 
-Future<bool> createNewSignalSession(Response_UserData userData) async {
+Future<bool> processSignalUserData(Response_UserData userData) async {
   final SignalProtocolStore? signalStore = await getSignalStore();
 
   if (signalStore == null) {
     return false;
   }
 
-  final targetAddress = SignalProtocolAddress(
-    userData.userId.toString(),
-    defaultDeviceId,
-  );
+  final targetAddress = getSignalAddress(userData.userId.toInt());
 
   final sessionBuilder = SessionBuilder.fromSignalStore(
     signalStore,
@@ -82,30 +79,6 @@ Future<void> deleteSessionWithTarget(int target) async {
   await signalStore.sessionStore.deleteSession(address);
 }
 
-Future<Fingerprint?> generateSessionFingerPrint(int target) async {
-  final signalStore = await getSignalStore();
-  if (signalStore == null) return null;
-  try {
-    final targetIdentity = await signalStore
-        .getIdentity(SignalProtocolAddress(target.toString(), defaultDeviceId));
-    if (targetIdentity != null) {
-      final generator = NumericFingerprintGenerator(5200);
-      final localFingerprint = generator.createFor(
-        1,
-        Uint8List.fromList([gUser.userId]),
-        (await signalStore.getIdentityKeyPair()).getPublicKey(),
-        Uint8List.fromList([target]),
-        targetIdentity,
-      );
-
-      return localFingerprint;
-    }
-    return null;
-  } catch (e) {
-    return null;
-  }
-}
-
 Future<Uint8List?> getPublicKeyFromContact(int contactId) async {
   final signalStore = await getSignalStore();
   if (signalStore == null) return null;
@@ -124,3 +97,13 @@ Future<Uint8List?> getPublicKeyFromContact(int contactId) async {
     return null;
   }
 }
+
+Future<bool> handleSessionResync(int fromUserId) async {
+  final userData = await apiService.getUserById(fromUserId);
+  if (userData != null) {
+    Log.info('Got new session data from the server to re-sync the session');
+    return processSignalUserData(userData);
+  }
+  Log.info('Could not download userdata from the server.');
+  return false;
+}

lib/src/services/signal/utils.signal.dart

@@ -1,6 +1,7 @@
 import 'package:libsignal_protocol_dart/libsignal_protocol_dart.dart';
 import 'package:twonly/src/database/signal/connect_signal_protocol_store.dart';
 import 'package:twonly/src/model/json/signal_identity.dart';
+import 'package:twonly/src/services/signal/consts.signal.dart';
 import 'package:twonly/src/services/signal/identity.signal.dart';
 
 Future<ConnectSignalProtocolStore?> getSignalStore() async {
@@ -18,3 +19,7 @@ Future<ConnectSignalProtocolStore> getSignalStoreFromIdentity(
     signalIdentity.registrationId,
   );
 }
+
+SignalProtocolAddress getSignalAddress(int userId) {
+  return SignalProtocolAddress(userId.toString(), defaultDeviceId);
+}

lib/src/views/settings/developer/automated_testing.view.dart

@@ -2,8 +2,10 @@ import 'dart:async';
 
 import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
+import 'package:libsignal_protocol_dart/libsignal_protocol_dart.dart';
 import 'package:twonly/globals.dart';
 import 'package:twonly/src/services/api/messages.dart';
+import 'package:twonly/src/services/signal/utils.signal.dart';
 import 'package:twonly/src/utils/log.dart';
 import 'package:twonly/src/utils/misc.dart';
 
@@ -26,13 +28,63 @@ class _AutomatedTestingViewState extends State<AutomatedTestingView> {
 
   @override
   Widget build(BuildContext context) {
+    if (kReleaseMode) return Container();
     return Scaffold(
       appBar: AppBar(
         title: const Text('Automated Testing'),
       ),
       body: ListView(
         children: [
-          if (!kReleaseMode)
+          ListTile(
+            title: const Text('Trigger Signal Out-Of-Sync'),
+            onTap: () async {
+              final username = await showUserNameDialog(context);
+              if (username == null) return;
+              final contacts = await twonlyDB.contactsDao
+                  .getContactsByUsername(username.toLowerCase());
+              if (contacts.length != 1) {
+                Log.error('No single user fund');
+                return;
+              }
+              final userId = contacts.first.userId;
+
+              final group = await twonlyDB.groupsDao.getDirectChat(userId);
+              if (group == null) {
+                Log.error('Target user must have a group!');
+                return;
+              }
+
+              final sessionStore = await getSignalStore();
+
+              // 1. Store a valid session
+              final originalSession =
+                  await sessionStore!.loadSession(getSignalAddress(userId));
+              final serializedSession = originalSession.serialize();
+
+              for (var i = 0; i < 10; i++) {
+                await insertAndSendTextMessage(
+                  group.groupId,
+                  'DesyncTest_1',
+                  null,
+                );
+              }
+
+              final corruptedSession =
+                  SessionRecord.fromSerialized(serializedSession);
+              await sessionStore.storeSession(
+                getSignalAddress(userId),
+                corruptedSession,
+              );
+
+              await insertAndSendTextMessage(
+                group.groupId,
+                'DesyncTest_2',
+                null,
+              );
+
+              // The other client should res
+            },
+          ),
           ListTile(
             title: const Text('Sending a lot of messages.'),
             subtitle: Text(lotsOfMessagesStatus),

pubspec.yaml

@@ -3,7 +3,7 @@ description: "twonly, a privacy-friendly way to connect with friends through sec
 
 publish_to: 'none'
 
-version: 0.0.96+96
+version: 0.0.97+97
 
 environment:
   sdk: ^3.6.0