matrix-0.8.13/lib/src/utils/device_keys_list.dart

516 lines
16 KiB
Dart

/*
* Famedly Matrix SDK
* Copyright (C) 2020, 2021 Famedly GmbH
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
import 'dart:convert';
import 'package:canonical_json/canonical_json.dart';
import 'package:collection/collection.dart' show IterableExtension;
import 'package:matrix/matrix.dart';
import 'package:olm/olm.dart' as olm;
import '../../encryption.dart';
enum UserVerifiedStatus { verified, unknown, unknownDevice }
class DeviceKeysList {
Client client;
String userId;
bool outdated = true;
Map<String, DeviceKeys> deviceKeys = {};
Map<String, CrossSigningKey> crossSigningKeys = {};
SignableKey? getKey(String id) => deviceKeys[id] ?? crossSigningKeys[id];
CrossSigningKey? getCrossSigningKey(String type) =>
crossSigningKeys.values.firstWhereOrNull((k) => k.usage.contains(type));
CrossSigningKey? get masterKey => getCrossSigningKey('master');
CrossSigningKey? get selfSigningKey => getCrossSigningKey('self_signing');
CrossSigningKey? get userSigningKey => getCrossSigningKey('user_signing');
UserVerifiedStatus get verified {
if (masterKey == null) {
return UserVerifiedStatus.unknown;
}
if (masterKey!.verified) {
for (final key in deviceKeys.values) {
if (!key.verified) {
return UserVerifiedStatus.unknownDevice;
}
}
return UserVerifiedStatus.verified;
} else {
for (final key in deviceKeys.values) {
if (!key.verified) {
return UserVerifiedStatus.unknown;
}
}
return UserVerifiedStatus.verified;
}
}
/// Starts a verification with this device. This might need to create a new
/// direct chat to send the verification request over this room. For this you
/// can set parameters here.
Future<KeyVerification> startVerification({
bool? newDirectChatEnableEncryption,
List<StateEvent>? newDirectChatInitialState,
}) async {
final encryption = client.encryption;
if (encryption == null) {
throw Exception('Encryption not enabled');
}
if (userId != client.userID) {
// in-room verification with someone else
final roomId = await client.startDirectChat(
userId,
enableEncryption: newDirectChatEnableEncryption,
initialState: newDirectChatInitialState,
waitForSync: false,
);
final room =
client.getRoomById(roomId) ?? Room(id: roomId, client: client);
final request =
KeyVerification(encryption: encryption, room: room, userId: userId);
await request.start();
// no need to add to the request client object. As we are doing a room
// verification request that'll happen automatically once we know the transaction id
return request;
} else {
// broadcast self-verification
final request = KeyVerification(
encryption: encryption, userId: userId, deviceId: '*');
await request.start();
encryption.keyVerificationManager.addRequest(request);
return request;
}
}
DeviceKeysList.fromDbJson(
Map<String, dynamic> dbEntry,
List<Map<String, dynamic>> childEntries,
List<Map<String, dynamic>> crossSigningEntries,
Client cl)
: client = cl,
userId = dbEntry['user_id'] ?? '' {
outdated = dbEntry['outdated'];
deviceKeys = {};
for (final childEntry in childEntries) {
final entry = DeviceKeys.fromDb(childEntry, client);
if (entry.isValid) {
deviceKeys[childEntry['device_id']] = entry;
} else {
outdated = true;
}
}
for (final crossSigningEntry in crossSigningEntries) {
final entry = CrossSigningKey.fromDbJson(crossSigningEntry, client);
if (entry.isValid) {
crossSigningKeys[crossSigningEntry['public_key']] = entry;
} else {
outdated = true;
}
}
}
DeviceKeysList(this.userId, this.client);
}
class SimpleSignableKey extends MatrixSignableKey {
@override
String? identifier;
SimpleSignableKey.fromJson(Map<String, dynamic> json) : super.fromJson(json);
}
abstract class SignableKey extends MatrixSignableKey {
Client client;
Map<String, dynamic>? validSignatures;
bool? _verified;
bool? _blocked;
String? get ed25519Key => keys['ed25519:$identifier'];
bool get verified =>
identifier != null && (directVerified || crossVerified) && !(blocked);
bool get blocked => _blocked ?? false;
set blocked(bool b) => _blocked = b;
bool get encryptToDevice =>
!(blocked) &&
identifier != null &&
ed25519Key != null &&
(client.userDeviceKeys[userId]?.masterKey?.verified ?? false
? verified
: true);
void setDirectVerified(bool v) {
_verified = v;
}
bool get directVerified => _verified ?? false;
bool get crossVerified => hasValidSignatureChain();
bool get signed => hasValidSignatureChain(verifiedOnly: false);
SignableKey.fromJson(Map<String, dynamic> json, Client cl)
: client = cl,
super.fromJson(json) {
_verified = false;
_blocked = false;
}
SimpleSignableKey cloneForSigning() {
final newKey = SimpleSignableKey.fromJson(toJson().copy());
newKey.identifier = identifier;
(newKey.signatures ??= {}).clear();
return newKey;
}
String get signingContent {
final data = super.toJson().copy();
// some old data might have the custom verified and blocked keys
data.remove('verified');
data.remove('blocked');
// remove the keys not needed for signing
data.remove('unsigned');
data.remove('signatures');
return String.fromCharCodes(canonicalJson.encode(data));
}
bool _verifySignature(String pubKey, String signature,
{bool isSignatureWithoutLibolmValid = false}) {
olm.Utility olmutil;
try {
olmutil = olm.Utility();
} catch (e) {
// if no libolm is present we land in this catch block, and return the default
// set if no libolm is there. Some signatures should be assumed-valid while others
// should be assumed-invalid
return isSignatureWithoutLibolmValid;
}
var valid = false;
try {
olmutil.ed25519_verify(pubKey, signingContent, signature);
valid = true;
} catch (_) {
// bad signature
valid = false;
} finally {
olmutil.free();
}
return valid;
}
bool hasValidSignatureChain(
{bool verifiedOnly = true,
Set<String>? visited,
Set<String>? onlyValidateUserIds}) {
if (!client.encryptionEnabled) {
return false;
}
final visited_ = visited ?? <String>{};
final onlyValidateUserIds_ = onlyValidateUserIds ?? <String>{};
final setKey = '$userId;$identifier';
if (visited_.contains(setKey) ||
(onlyValidateUserIds_.isNotEmpty &&
!onlyValidateUserIds_.contains(userId))) {
return false; // prevent recursion & validate hasValidSignatureChain
}
visited_.add(setKey);
if (signatures == null) return false;
for (final signatureEntries in signatures!.entries) {
final otherUserId = signatureEntries.key;
if (!client.userDeviceKeys.containsKey(otherUserId)) {
continue;
}
// we don't allow transitive trust unless it is for ourself
if (otherUserId != userId && otherUserId != client.userID) {
continue;
}
for (final signatureEntry in signatureEntries.value.entries) {
final fullKeyId = signatureEntry.key;
final signature = signatureEntry.value;
final keyId = fullKeyId.substring('ed25519:'.length);
// we ignore self-signatures here
if (otherUserId == userId && keyId == identifier) {
continue;
}
final key = client.userDeviceKeys[otherUserId]?.deviceKeys[keyId] ??
client.userDeviceKeys[otherUserId]?.crossSigningKeys[keyId];
if (key == null) {
continue;
}
if (onlyValidateUserIds_.isNotEmpty &&
!onlyValidateUserIds_.contains(key.userId)) {
// we don't want to verify keys from this user
continue;
}
if (key.blocked) {
continue; // we can't be bothered about this keys signatures
}
var haveValidSignature = false;
var gotSignatureFromCache = false;
final fullKeyIdBool = validSignatures
?.tryGetMap<String, dynamic>(otherUserId)
?.tryGet<bool>(fullKeyId);
if (fullKeyIdBool == true) {
haveValidSignature = true;
gotSignatureFromCache = true;
} else if (fullKeyIdBool == false) {
haveValidSignature = false;
gotSignatureFromCache = true;
}
if (!gotSignatureFromCache && key.ed25519Key != null) {
// validate the signature manually
haveValidSignature = _verifySignature(key.ed25519Key!, signature);
final validSignatures = this.validSignatures ??= <String, dynamic>{};
if (!validSignatures.containsKey(otherUserId)) {
validSignatures[otherUserId] = <String, dynamic>{};
}
validSignatures[otherUserId][fullKeyId] = haveValidSignature;
}
if (!haveValidSignature) {
// no valid signature, this key is useless
continue;
}
if ((verifiedOnly && key.directVerified) ||
(key is CrossSigningKey &&
key.usage.contains('master') &&
key.directVerified &&
key.userId == client.userID)) {
return true; // we verified this key and it is valid...all checks out!
}
// or else we just recurse into that key and chack if it works out
final haveChain = key.hasValidSignatureChain(
verifiedOnly: verifiedOnly,
visited: visited_,
onlyValidateUserIds: onlyValidateUserIds);
if (haveChain) {
return true;
}
}
}
return false;
}
Future<void> setVerified(bool newVerified, [bool sign = true]) async {
_verified = newVerified;
final encryption = client.encryption;
if (newVerified &&
sign &&
encryption != null &&
client.encryptionEnabled &&
encryption.crossSigning.signable([this])) {
// sign the key!
// ignore: unawaited_futures
encryption.crossSigning.sign([this]);
}
}
Future<void> setBlocked(bool newBlocked);
@override
Map<String, dynamic> toJson() {
final data = super.toJson().copy();
// some old data may have the verified and blocked keys which are unneeded now
data.remove('verified');
data.remove('blocked');
return data;
}
@override
String toString() => json.encode(toJson());
@override
bool operator ==(dynamic other) => (other is SignableKey &&
other.userId == userId &&
other.identifier == identifier);
}
class CrossSigningKey extends SignableKey {
@override
String? identifier;
String? get publicKey => identifier;
late List<String> usage;
bool get isValid =>
userId.isNotEmpty &&
publicKey != null &&
keys.isNotEmpty &&
ed25519Key != null;
@override
Future<void> setVerified(bool newVerified, [bool sign = true]) async {
if (!isValid) {
throw Exception('setVerified called on invalid key');
}
await super.setVerified(newVerified, sign);
await client.database
?.setVerifiedUserCrossSigningKey(newVerified, userId, publicKey!);
}
@override
Future<void> setBlocked(bool newBlocked) async {
if (!isValid) {
throw Exception('setBlocked called on invalid key');
}
_blocked = newBlocked;
await client.database
?.setBlockedUserCrossSigningKey(newBlocked, userId, publicKey!);
}
CrossSigningKey.fromMatrixCrossSigningKey(MatrixCrossSigningKey k, Client cl)
: super.fromJson(k.toJson().copy(), cl) {
final json = toJson();
identifier = k.publicKey;
usage = json['usage'].cast<String>();
}
CrossSigningKey.fromDbJson(Map<String, dynamic> dbEntry, Client cl)
: super.fromJson(Event.getMapFromPayload(dbEntry['content']), cl) {
final json = toJson();
identifier = dbEntry['public_key'];
usage = json['usage'].cast<String>();
_verified = dbEntry['verified'];
_blocked = dbEntry['blocked'];
}
CrossSigningKey.fromJson(Map<String, dynamic> json, Client cl)
: super.fromJson(json.copy(), cl) {
final json = toJson();
usage = json['usage'].cast<String>();
if (keys.isNotEmpty) {
identifier = keys.values.first;
}
}
}
class DeviceKeys extends SignableKey {
@override
String? identifier;
String? get deviceId => identifier;
late List<String> algorithms;
late DateTime lastActive;
String? get curve25519Key => keys['curve25519:$deviceId'];
String? get deviceDisplayName => unsigned?['device_display_name'];
bool? _validSelfSignature;
bool get selfSigned =>
_validSelfSignature ??
(_validSelfSignature = (deviceId != null &&
signatures
?.tryGetMap<String, dynamic>(userId)
?.tryGet<String>('ed25519:$deviceId') ==
null
? false
// without libolm we still want to be able to add devices. In that case we ofc just can't
// verify the signature
: _verifySignature(
ed25519Key!, signatures![userId]!['ed25519:$deviceId']!,
isSignatureWithoutLibolmValid: true)));
@override
bool get blocked => super.blocked || !selfSigned;
bool get isValid =>
deviceId != null &&
keys.isNotEmpty &&
curve25519Key != null &&
ed25519Key != null &&
selfSigned;
@override
Future<void> setVerified(bool newVerified, [bool sign = true]) async {
if (!isValid) {
//throw Exception('setVerified called on invalid key');
return;
}
await super.setVerified(newVerified, sign);
await client.database
?.setVerifiedUserDeviceKey(newVerified, userId, deviceId!);
}
@override
Future<void> setBlocked(bool newBlocked) async {
if (!isValid) {
//throw Exception('setBlocked called on invalid key');
return;
}
_blocked = newBlocked;
await client.database
?.setBlockedUserDeviceKey(newBlocked, userId, deviceId!);
}
DeviceKeys.fromMatrixDeviceKeys(MatrixDeviceKeys k, Client cl,
[DateTime? lastActiveTs])
: super.fromJson(k.toJson().copy(), cl) {
final json = toJson();
identifier = k.deviceId;
algorithms = json['algorithms'].cast<String>();
lastActive = lastActiveTs ?? DateTime.now();
}
DeviceKeys.fromDb(Map<String, dynamic> dbEntry, Client cl)
: super.fromJson(Event.getMapFromPayload(dbEntry['content']), cl) {
final json = toJson();
identifier = dbEntry['device_id'];
algorithms = json['algorithms'].cast<String>();
_verified = dbEntry['verified'];
_blocked = dbEntry['blocked'];
lastActive =
DateTime.fromMillisecondsSinceEpoch(dbEntry['last_active'] ?? 0);
}
DeviceKeys.fromJson(Map<String, dynamic> json, Client cl)
: super.fromJson(json.copy(), cl) {
final json = toJson();
identifier = json['device_id'];
algorithms = json['algorithms'].cast<String>();
lastActive = DateTime.fromMillisecondsSinceEpoch(0);
}
KeyVerification startVerification() {
if (!isValid) {
throw Exception('setVerification called on invalid key');
}
final encryption = client.encryption;
if (encryption == null) {
throw Exception('setVerification called with disabled encryption');
}
final request = KeyVerification(
encryption: encryption, userId: userId, deviceId: deviceId!);
request.start();
encryption.keyVerificationManager.addRequest(request);
return request;
}
}