fix: Allow empty OMEMO messages to bypass trust
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@ -224,8 +224,11 @@ class OmemoSessionManager {
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// We assume that the user already checked if the session exists
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for (final jid in jids) {
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for (final deviceId in _deviceMap[jid]!) {
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// Only encrypt to devices that are trusted
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if (!(await _trustManager.isTrusted(jid, deviceId))) continue;
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// Empty OMEMO messages are allowed to bypass trust
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if (plaintext != null) {
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// Only encrypt to devices that are trusted
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if (!(await _trustManager.isTrusted(jid, deviceId))) continue;
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}
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final ratchetKey = RatchetMapKey(jid, deviceId);
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final ratchet = _ratchetMap[ratchetKey]!;
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14
lib/src/trust/never.dart
Normal file
14
lib/src/trust/never.dart
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@ -0,0 +1,14 @@
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import 'package:meta/meta.dart';
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import 'package:omemo_dart/src/trust/base.dart';
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/// Only use for testing!
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/// An implementation of TrustManager that never trusts any device and thus
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/// has no internal state.
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@visibleForTesting
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class NeverTrustingTrustManager extends TrustManager {
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@override
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Future<bool> isTrusted(String jid, int deviceId) async => false;
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@override
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Future<void> onNewSession(String jid, int deviceId) async {}
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}
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@ -1,5 +1,6 @@
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import 'package:omemo_dart/omemo_dart.dart';
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import 'package:omemo_dart/src/trust/always.dart';
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import 'package:omemo_dart/src/trust/never.dart';
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import 'package:test/test.dart';
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void main() {
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@ -336,4 +337,34 @@ void main() {
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);
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expect(messagePlaintext, bobMessage);
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});
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test('Test trust bypassing with empty OMEMO messages', () async {
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const aliceJid = 'alice@server.example';
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const bobJid = 'bob@other.server.example';
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// Alice and Bob generate their sessions
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final aliceSession = await OmemoSessionManager.generateNewIdentity(
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aliceJid,
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NeverTrustingTrustManager(),
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opkAmount: 1,
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);
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final bobSession = await OmemoSessionManager.generateNewIdentity(
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bobJid,
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NeverTrustingTrustManager(),
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opkAmount: 1,
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);
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// Alice encrypts an empty message for Bob
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final aliceMessage = await aliceSession.encryptToJid(
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bobJid,
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null,
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newSessions: [
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await (await bobSession.getDevice()).toBundle(),
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],
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);
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// Despite Alice not trusting Bob's device, we should have encrypted it for his
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// untrusted device.
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expect(aliceMessage.encryptedKeys.length, 1);
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});
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}
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