PapaTutuWawa/omemo_dart
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fix: Track ratchet sessions using the (jid, device) tuple

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This commit is contained in:
PapaTutuWawa 2022-08-06 11:25:41 +02:00
parent f8830b974b
commit 189d823c87
2 changed files with 29 additions and 9 deletions
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36
lib/src/omemo/sessionmanager.dart
View File

@ -20,6 +20,7 @@ import 'package:synchronized/synchronized.dart';
/// The info used for when encrypting the AES key for the actual payload.
const omemoPayloadInfoString = 'OMEMO Payload';
@immutable
class EncryptionResult {
const EncryptionResult(this.ciphertext, this.encryptedKeys);
@ -32,6 +33,7 @@ class EncryptionResult {
final List<EncryptedKey> encryptedKeys;
}
@immutable
class EncryptedKey {
const EncryptedKey(this.rid, this.value, this.kex);
@ -40,6 +42,22 @@ class EncryptedKey {
final bool kex;
}
@immutable
class RatchetMapKey {
const RatchetMapKey(this.jid, this.deviceId);
final String jid;
final int deviceId;
@override
bool operator ==(Object other) {
return other is RatchetMapKey && jid == other.jid && deviceId == other.deviceId;
}
@override
int get hashCode => jid.hashCode ^ deviceId.hashCode;
}
class OmemoSessionManager {
OmemoSessionManager(this._device)
@ -61,8 +79,7 @@ class OmemoSessionManager {
final Lock _lock;
/// Mapping of the Device Id to its OMEMO session
// TODO(PapaTutuWawa): Make this map use a tuple (Jid, Id) as a key
final Map<int, OmemoDoubleRatchet> _ratchetMap;
final Map<RatchetMapKey, OmemoDoubleRatchet> _ratchetMap;
/// Mapping of a bare Jid to its Device Ids
final Map<String, List<int>> _deviceMap;
@ -99,8 +116,9 @@ class OmemoSessionManager {
}
// Add the ratchet session
if (!_ratchetMap.containsKey(deviceId)) {
_ratchetMap[deviceId] = ratchet;
final key = RatchetMapKey(jid, deviceId);
if (!_ratchetMap.containsKey(key)) {
_ratchetMap[key] = ratchet;
} else {
// TODO(PapaTutuWawa): What do we do now?
throw Exception();
@ -180,7 +198,8 @@ class OmemoSessionManager {
await _lock.synchronized(() async {
// We assume that the user already checked if the session exists
for (final deviceId in _deviceMap[jid]!) {
final ratchet = _ratchetMap[deviceId]!;
final ratchetKey = RatchetMapKey(jid, deviceId);
final ratchet = _ratchetMap[ratchetKey]!;
final ciphertext = (await ratchet.ratchetEncrypt(concatKey)).ciphertext;
if (kex.isNotEmpty && kex.containsKey(deviceId)) {
@ -256,8 +275,9 @@ class OmemoSessionManager {
}
final message = OmemoMessage.fromBuffer(authMessage.message!);
final ratchet = _ratchetMap[senderDeviceId]!;
final ratchetKey = RatchetMapKey(senderJid, senderDeviceId);
final ratchet = _ratchetMap[ratchetKey]!;
List<int> keyAndHmac;
if (rawKey.kex) {
keyAndHmac = await ratchet.ratchetDecrypt(message, authMessage.writeToBuffer());
@ -278,5 +298,5 @@ class OmemoSessionManager {
}
@visibleForTesting
OmemoDoubleRatchet getRatchet(int deviceId) => _ratchetMap[deviceId]!;
OmemoDoubleRatchet getRatchet(String jid, int deviceId) => _ratchetMap[RatchetMapKey(jid, deviceId)]!;
}

2
test/serialisation_test.dart
View File

@ -41,7 +41,7 @@ void main() {
(await aliceSession.getDevice()).id,
aliceMessage.encryptedKeys,
);
final aliceOld = aliceSession.getRatchet((await bobSession.getDevice()).id);
final aliceOld = aliceSession.getRatchet(bobJid, (await bobSession.getDevice()).id);
final aliceSerialised = await aliceOld.toJson();
final aliceNew = OmemoDoubleRatchet.fromJson(aliceSerialised);