generalize verification methods
This commit is contained in:
Sorunome
parent
3b9be3546a
commit
a4c693558d
|
|
@ -42,13 +42,47 @@ import '../room.dart';
|
|||
| |
|
||||
*/
|
||||
|
||||
final KNOWN_KEY_AGREEMENT_PROTOCOLS = ['curve25519-hkdf-sha256', 'curve25519'];
|
||||
final KNOWN_HASHES = ['sha256'];
|
||||
final KNOWN_MESSAGE_AUTHENTIFICATION_CODES = ['hkdf-hmac-sha256'];
|
||||
final KNOWN_AUTHENTICATION_TYPES = ['emoji', 'decimal'];
|
||||
|
||||
enum KeyVerificationState { askAccept, waitingAccept, askSas, waitingSas, done, error }
|
||||
|
||||
List<String> _intersect(List<String> a, List<dynamic> b) {
|
||||
final res = <String>[];
|
||||
for (final v in a) {
|
||||
if (b.contains(v)) {
|
||||
res.add(v);
|
||||
}
|
||||
}
|
||||
return res;
|
||||
}
|
||||
|
||||
List<int> _bytesToInt(Uint8List bytes, int totalBits) {
|
||||
final ret = <int>[];
|
||||
var current = 0;
|
||||
var numBits = 0;
|
||||
for (final byte in bytes) {
|
||||
for (final bit in [7, 6, 5, 4, 3, 2, 1, 0]) {
|
||||
numBits++;
|
||||
if ((byte & (1 << bit)) > 0) {
|
||||
current += 1 << (totalBits - numBits);
|
||||
}
|
||||
if (numBits >= totalBits) {
|
||||
ret.add(current);
|
||||
current = 0;
|
||||
numBits = 0;
|
||||
}
|
||||
}
|
||||
}
|
||||
return ret;
|
||||
}
|
||||
|
||||
final VERIFICATION_METHODS = [_KeyVerificationMethodSas.type];
|
||||
|
||||
_KeyVerificationMethod _makeVerificationMethod(String type, KeyVerification request) {
|
||||
if (type == _KeyVerificationMethodSas.type) {
|
||||
return _KeyVerificationMethodSas(request: request);
|
||||
}
|
||||
throw 'Unkown method type';
|
||||
}
|
||||
|
||||
class KeyVerification {
|
||||
String transactionId;
|
||||
final Client client;
|
||||
|
|
@ -57,16 +91,10 @@ class KeyVerification {
|
|||
void Function() onUpdate;
|
||||
String get deviceId => _deviceId;
|
||||
String _deviceId;
|
||||
olm.SAS sas;
|
||||
bool startedVerification = false;
|
||||
|
||||
String keyAgreementProtocol;
|
||||
String hash;
|
||||
String messageAuthenticationCode;
|
||||
List<String> authenticationTypes;
|
||||
String startCanonicalJson;
|
||||
String commitment;
|
||||
String theirPublicKey;
|
||||
_KeyVerificationMethod method;
|
||||
List<String> possibleMethods;
|
||||
Map<String, dynamic> startPaylaod;
|
||||
|
||||
DateTime lastActivity;
|
||||
String lastStep;
|
||||
|
|
@ -76,8 +104,6 @@ class KeyVerification {
|
|||
String canceledCode;
|
||||
String canceledReason;
|
||||
|
||||
Map<String, dynamic> macPayload;
|
||||
|
||||
KeyVerification({this.client, this.room, this.userId, String deviceId, this.onUpdate}) {
|
||||
lastActivity = DateTime.now();
|
||||
_deviceId ??= deviceId;
|
||||
|
|
@ -85,7 +111,7 @@ class KeyVerification {
|
|||
|
||||
void dispose() {
|
||||
print('[Key Verification] disposing object...');
|
||||
sas?.free();
|
||||
method?.dispose();
|
||||
}
|
||||
|
||||
static String getTransactionId(Map<String, dynamic> payload) {
|
||||
|
|
@ -99,11 +125,11 @@ class KeyVerification {
|
|||
transactionId = randomString(512);
|
||||
}
|
||||
await send('m.key.verification.request', {
|
||||
'methods': ['m.sas.v1'],
|
||||
'methods': VERIFICATION_METHODS,
|
||||
'timestamp': DateTime.now().millisecondsSinceEpoch,
|
||||
});
|
||||
startedVerification = true;
|
||||
_setState(KeyVerificationState.waitingAccept);
|
||||
setState(KeyVerificationState.waitingAccept);
|
||||
}
|
||||
|
||||
Future<void> handlePayload(String type, Map<String, dynamic> payload, [String eventId]) async {
|
||||
|
|
@ -113,12 +139,6 @@ class KeyVerification {
|
|||
case 'm.key.verification.request':
|
||||
_deviceId ??= payload['from_device'];
|
||||
transactionId ??= eventId ?? payload['transaction_id'];
|
||||
// verify it has a method we can use
|
||||
if (!(payload['methods'] is List && payload['methods'].contains('m.sas.v1'))) {
|
||||
// reject it outright
|
||||
await cancel('m.unknown_method');
|
||||
return;
|
||||
}
|
||||
// verify the timestamp
|
||||
final now = DateTime.now();
|
||||
final verifyTime = DateTime.fromMillisecondsSinceEpoch(payload['timestamp']);
|
||||
|
|
@ -126,11 +146,26 @@ class KeyVerification {
|
|||
await cancel('m.timeout');
|
||||
return;
|
||||
}
|
||||
_setState(KeyVerificationState.askAccept);
|
||||
// verify it has a method we can use
|
||||
possibleMethods = _intersect(VERIFICATION_METHODS, payload['methods']);
|
||||
if (possibleMethods.isEmpty) {
|
||||
// reject it outright
|
||||
await cancel('m.unknown_method');
|
||||
return;
|
||||
}
|
||||
setState(KeyVerificationState.askAccept);
|
||||
break;
|
||||
case 'm.key.verification.ready':
|
||||
await _sendStart();
|
||||
_setState(KeyVerificationState.waitingAccept);
|
||||
possibleMethods = _intersect(VERIFICATION_METHODS, payload['methods']);
|
||||
if (possibleMethods.isEmpty) {
|
||||
// reject it outright
|
||||
await cancel('m.unknown_method');
|
||||
return;
|
||||
}
|
||||
// TODO: Pick method?
|
||||
method = _makeVerificationMethod(possibleMethods.first, this);
|
||||
await method.sendStart();
|
||||
setState(KeyVerificationState.waitingAccept);
|
||||
break;
|
||||
case 'm.key.verification.start':
|
||||
_deviceId ??= payload['from_device'];
|
||||
|
|
@ -138,51 +173,20 @@ class KeyVerification {
|
|||
if (!(await verifyLastStep(['m.key.verification.request', null]))) {
|
||||
return; // abort
|
||||
}
|
||||
if (!_validateStart(payload)) {
|
||||
if (!VERIFICATION_METHODS.contains(payload['method'])) {
|
||||
await cancel('m.unknown_method');
|
||||
return;
|
||||
}
|
||||
method = _makeVerificationMethod(payload['method'], this);
|
||||
if (lastStep == null) {
|
||||
// we need to ask the user for verification
|
||||
_setState(KeyVerificationState.askAccept);
|
||||
} else {
|
||||
await _sendAccept();
|
||||
}
|
||||
break;
|
||||
case 'm.key.verification.accept':
|
||||
if (!(await verifyLastStep(['m.key.verification.ready', null]))) {
|
||||
return;
|
||||
}
|
||||
if (!_handleAccept(payload)) {
|
||||
await cancel('m.unknown_method');
|
||||
return;
|
||||
}
|
||||
await _sendKey();
|
||||
break;
|
||||
case 'm.key.verification.key':
|
||||
if (!(await verifyLastStep(['m.key.verification.accept', 'm.key.verification.start']))) {
|
||||
return;
|
||||
}
|
||||
_handleKey(payload);
|
||||
if (lastStep == 'm.key.verification.start') {
|
||||
// we need to send our key
|
||||
await _sendKey();
|
||||
} else {
|
||||
// we already sent our key, time to verify the commitment being valid
|
||||
if (!_validateCommitment()) {
|
||||
await cancel('m.mismatched_commitment');
|
||||
if (!method.validateStart(payload)) {
|
||||
await cancel('m.unknown_method');
|
||||
return;
|
||||
}
|
||||
}
|
||||
_setState(KeyVerificationState.askSas);
|
||||
break;
|
||||
case 'm.key.verification.mac':
|
||||
if (!(await verifyLastStep(['m.key.verification.key']))) {
|
||||
return;
|
||||
}
|
||||
macPayload = payload;
|
||||
if (state == KeyVerificationState.waitingSas) {
|
||||
await _processMac();
|
||||
startPaylaod = payload;
|
||||
setState(KeyVerificationState.askAccept);
|
||||
} else {
|
||||
await method.handlePayload(type, payload);
|
||||
}
|
||||
break;
|
||||
case 'm.key.verification.done':
|
||||
|
|
@ -192,10 +196,11 @@ class KeyVerification {
|
|||
canceled = true;
|
||||
canceledCode = payload['code'];
|
||||
canceledReason = payload['reason'];
|
||||
_setState(KeyVerificationState.error);
|
||||
setState(KeyVerificationState.error);
|
||||
break;
|
||||
default:
|
||||
return;
|
||||
await method.handlePayload(type, payload);
|
||||
break;
|
||||
}
|
||||
lastStep = type;
|
||||
} catch (err, stacktrace) {
|
||||
|
|
@ -212,15 +217,15 @@ class KeyVerification {
|
|||
if (!(await verifyLastStep(['m.key.verification.request', 'm.key.verification.start']))) {
|
||||
return;
|
||||
}
|
||||
_setState(KeyVerificationState.waitingAccept);
|
||||
setState(KeyVerificationState.waitingAccept);
|
||||
if (lastStep == 'm.key.verification.request') {
|
||||
// we need to send a ready event
|
||||
await send('m.key.verification.ready', {
|
||||
'methods': ['m.sas.v1'],
|
||||
'methods': possibleMethods,
|
||||
});
|
||||
} else {
|
||||
// we need to send an accept event
|
||||
await _sendAccept();
|
||||
await method.handlePayload('m.key.verification.start', startPaylaod);
|
||||
}
|
||||
}
|
||||
|
||||
|
|
@ -232,43 +237,276 @@ class KeyVerification {
|
|||
await cancel('m.user');
|
||||
}
|
||||
|
||||
Future<void> acceptSas() async {
|
||||
if (method is _KeyVerificationMethodSas) {
|
||||
await (method as _KeyVerificationMethodSas).acceptSas();
|
||||
}
|
||||
}
|
||||
|
||||
Future<void> rejectSas() async {
|
||||
if (method is _KeyVerificationMethodSas) {
|
||||
await (method as _KeyVerificationMethodSas).rejectSas();
|
||||
}
|
||||
}
|
||||
|
||||
List<int> get sasNumbers {
|
||||
if (method is _KeyVerificationMethodSas) {
|
||||
return _bytesToInt((method as _KeyVerificationMethodSas).makeSas(5), 13).map((n) => n + 1000).toList();
|
||||
}
|
||||
return [];
|
||||
}
|
||||
|
||||
List<String> get sasTypes {
|
||||
if (method is _KeyVerificationMethodSas) {
|
||||
return (method as _KeyVerificationMethodSas).authenticationTypes;
|
||||
}
|
||||
return [];
|
||||
}
|
||||
|
||||
List<KeyVerificationEmoji> get sasEmojis {
|
||||
if (method is _KeyVerificationMethodSas) {
|
||||
final numbers = _bytesToInt((method as _KeyVerificationMethodSas).makeSas(6), 6);
|
||||
return numbers.map((n) => KeyVerificationEmoji(n)).toList().sublist(0, 7);
|
||||
}
|
||||
return [];
|
||||
}
|
||||
|
||||
Future<void> verifyKeys(Map<String, String> keys, Future<bool> Function(String, DeviceKeys) verifier) async {
|
||||
final verifiedDevices = <String>[];
|
||||
|
||||
if (!client.userDeviceKeys.containsKey(userId)) {
|
||||
await cancel('m.key_mismatch');
|
||||
return;
|
||||
}
|
||||
for (final entry in keys.entries) {
|
||||
final keyId = entry.key;
|
||||
final verifyDeviceId = keyId.substring('ed25519:'.length);
|
||||
final keyInfo = entry.value;
|
||||
if (client.userDeviceKeys[userId].deviceKeys.containsKey(verifyDeviceId)) {
|
||||
if (!(await verifier(keyInfo, client.userDeviceKeys[userId].deviceKeys[verifyDeviceId]))) {
|
||||
await cancel('m.key_mismatch');
|
||||
return;
|
||||
}
|
||||
verifiedDevices.add(verifyDeviceId);
|
||||
} else {
|
||||
// TODO: we would check here if what we are verifying is actually a
|
||||
// cross-signing key and not a "normal" device key
|
||||
}
|
||||
}
|
||||
// okay, we reached this far, so all the devices are verified!
|
||||
for (final verifyDeviceId in verifiedDevices) {
|
||||
await client.userDeviceKeys[userId].deviceKeys[verifyDeviceId].setVerified(true, client);
|
||||
}
|
||||
}
|
||||
|
||||
Future<bool> verifyActivity() async {
|
||||
if (lastActivity != null && lastActivity.add(Duration(minutes: 10)).isAfter(DateTime.now())) {
|
||||
lastActivity = DateTime.now();
|
||||
return true;
|
||||
}
|
||||
await cancel('m.timeout');
|
||||
return false;
|
||||
}
|
||||
|
||||
Future<bool> verifyLastStep(List<String> checkLastStep) async {
|
||||
if (!(await verifyActivity())) {
|
||||
return false;
|
||||
}
|
||||
if (checkLastStep.contains(lastStep)) {
|
||||
return true;
|
||||
}
|
||||
await cancel('m.unexpected_message');
|
||||
return false;
|
||||
}
|
||||
|
||||
Future<void> cancel([String code = 'm.unknown']) async {
|
||||
await send('m.key.verification.cancel', {
|
||||
'reason': code,
|
||||
'code': code,
|
||||
});
|
||||
canceled = true;
|
||||
canceledCode = code;
|
||||
setState(KeyVerificationState.error);
|
||||
}
|
||||
|
||||
void makePayload(Map<String, dynamic> payload) {
|
||||
payload['from_device'] = client.deviceID;
|
||||
if (transactionId != null) {
|
||||
if (room != null) {
|
||||
payload['m.relates_to'] = {
|
||||
'rel_type': 'm.reference',
|
||||
'event_id': transactionId,
|
||||
};
|
||||
} else {
|
||||
payload['transaction_id'] = transactionId;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
Future<void> send(String type, Map<String, dynamic> payload) async {
|
||||
makePayload(payload);
|
||||
print('[Key Verification] Sending type ${type}: ' + payload.toString());
|
||||
print('[Key Verification] Sending to ${userId} device ${deviceId}');
|
||||
if (room != null) {
|
||||
if (['m.key.verification.request'].contains(type)) {
|
||||
payload['msgtype'] = type;
|
||||
payload['to'] = userId;
|
||||
payload['body'] = 'Attempting verification request. (${type}) Apparently your client doesn\'t support this';
|
||||
type = 'm.room.message';
|
||||
}
|
||||
final newTransactionId = await room.sendEvent(payload, type: type);
|
||||
if (transactionId == null) {
|
||||
transactionId = newTransactionId;
|
||||
client.addKeyVerificationRequest(this);
|
||||
}
|
||||
} else {
|
||||
await client.sendToDevice([client.userDeviceKeys[userId].deviceKeys[deviceId]], type, payload);
|
||||
}
|
||||
}
|
||||
|
||||
void setState(KeyVerificationState newState) {
|
||||
if (state != KeyVerificationState.error) {
|
||||
state = newState;
|
||||
}
|
||||
if (onUpdate != null) {
|
||||
onUpdate();
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
abstract class _KeyVerificationMethod {
|
||||
KeyVerification request;
|
||||
Client client;
|
||||
_KeyVerificationMethod({this.request}) {
|
||||
client = request.client;
|
||||
}
|
||||
|
||||
static String type;
|
||||
|
||||
Future<void> handlePayload(String type, Map<String, dynamic> payload);
|
||||
bool validateStart(Map<String, dynamic> payload) {
|
||||
return false;
|
||||
}
|
||||
Future<void> sendStart();
|
||||
void dispose() {}
|
||||
}
|
||||
|
||||
const KNOWN_KEY_AGREEMENT_PROTOCOLS = ['curve25519-hkdf-sha256', 'curve25519'];
|
||||
const KNOWN_HASHES = ['sha256'];
|
||||
const KNOWN_MESSAGE_AUTHENTIFICATION_CODES = ['hkdf-hmac-sha256'];
|
||||
const KNOWN_AUTHENTICATION_TYPES = ['emoji', 'decimal'];
|
||||
|
||||
class _KeyVerificationMethodSas extends _KeyVerificationMethod {
|
||||
_KeyVerificationMethodSas({KeyVerification request}) : super(request: request);
|
||||
|
||||
@override
|
||||
static String type = 'm.sas.v1';
|
||||
|
||||
String keyAgreementProtocol;
|
||||
String hash;
|
||||
String messageAuthenticationCode;
|
||||
List<String> authenticationTypes;
|
||||
String startCanonicalJson;
|
||||
String commitment;
|
||||
String theirPublicKey;
|
||||
Map<String, dynamic> macPayload;
|
||||
olm.SAS sas;
|
||||
|
||||
@override
|
||||
void dispose() {
|
||||
sas?.free();
|
||||
}
|
||||
|
||||
@override
|
||||
Future<void> handlePayload(String type, Map<String, dynamic> payload) async {
|
||||
try {
|
||||
switch (type) {
|
||||
case 'm.key.verification.start':
|
||||
if (!(await request.verifyLastStep(['m.key.verification.request', 'm.key.verification.start']))) {
|
||||
return; // abort
|
||||
}
|
||||
if (!validateStart(payload)) {
|
||||
await request.cancel('m.unknown_method');
|
||||
return;
|
||||
}
|
||||
await _sendAccept();
|
||||
break;
|
||||
case 'm.key.verification.accept':
|
||||
if (!(await request.verifyLastStep(['m.key.verification.ready']))) {
|
||||
return;
|
||||
}
|
||||
if (!_handleAccept(payload)) {
|
||||
await request.cancel('m.unknown_method');
|
||||
return;
|
||||
}
|
||||
await _sendKey();
|
||||
break;
|
||||
case 'm.key.verification.key':
|
||||
if (!(await request.verifyLastStep(['m.key.verification.accept', 'm.key.verification.start']))) {
|
||||
return;
|
||||
}
|
||||
_handleKey(payload);
|
||||
if (request.lastStep == 'm.key.verification.start') {
|
||||
// we need to send our key
|
||||
await _sendKey();
|
||||
} else {
|
||||
// we already sent our key, time to verify the commitment being valid
|
||||
if (!_validateCommitment()) {
|
||||
await request.cancel('m.mismatched_commitment');
|
||||
return;
|
||||
}
|
||||
}
|
||||
request.setState(KeyVerificationState.askSas);
|
||||
break;
|
||||
case 'm.key.verification.mac':
|
||||
if (!(await request.verifyLastStep(['m.key.verification.key']))) {
|
||||
return;
|
||||
}
|
||||
macPayload = payload;
|
||||
if (request.state == KeyVerificationState.waitingSas) {
|
||||
await _processMac();
|
||||
}
|
||||
break;
|
||||
}
|
||||
} catch (err, stacktrace) {
|
||||
print('[Key Verification SAS] An error occured: ' + err.toString());
|
||||
print(stacktrace);
|
||||
if (request.deviceId != null) {
|
||||
await request.cancel('m.invalid_message');
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
Future<void> acceptSas() async {
|
||||
await _sendMac();
|
||||
_setState(KeyVerificationState.waitingSas);
|
||||
request.setState(KeyVerificationState.waitingSas);
|
||||
if (macPayload != null) {
|
||||
await _processMac();
|
||||
}
|
||||
}
|
||||
|
||||
Future<void> rejectSas() async {
|
||||
await cancel('m.mismatched_sas');
|
||||
await request.cancel('m.mismatched_sas');
|
||||
}
|
||||
|
||||
List<int> get sasNumbers {
|
||||
return _bytesToInt(_makeSas(5), 13).map((n) => n + 1000).toList();
|
||||
}
|
||||
|
||||
List<KeyVerificationEmoji> get sasEmojis {
|
||||
final numbers = _bytesToInt(_makeSas(6), 6);
|
||||
return numbers.map((n) => KeyVerificationEmoji(n)).toList().sublist(0, 7);
|
||||
}
|
||||
|
||||
Future<void> _sendStart() async {
|
||||
@override
|
||||
Future<void> sendStart() async {
|
||||
final payload = <String, dynamic>{
|
||||
'method': 'm.sas.v1',
|
||||
'method': type,
|
||||
'key_agreement_protocols': KNOWN_KEY_AGREEMENT_PROTOCOLS,
|
||||
'hashes': KNOWN_HASHES,
|
||||
'message_authentication_codes': KNOWN_MESSAGE_AUTHENTIFICATION_CODES,
|
||||
'short_authentication_string': KNOWN_AUTHENTICATION_TYPES,
|
||||
};
|
||||
_makePayload(payload);
|
||||
request.makePayload(payload);
|
||||
// We just store the canonical json in here for later verification
|
||||
startCanonicalJson = String.fromCharCodes(canonicalJson.encode(payload));
|
||||
await send('m.key.verification.start', payload);
|
||||
await request.send('m.key.verification.start', payload);
|
||||
}
|
||||
|
||||
bool _validateStart(Map<String, dynamic> payload) {
|
||||
if (payload['method'] != 'm.sas.v1') {
|
||||
@override
|
||||
bool validateStart(Map<String, dynamic> payload) {
|
||||
if (payload['method'] != type) {
|
||||
return false;
|
||||
}
|
||||
final possibleKeyAgreementProtocols = _intersect(KNOWN_KEY_AGREEMENT_PROTOCOLS, payload['key_agreement_protocols']);
|
||||
|
|
@ -298,8 +536,8 @@ class KeyVerification {
|
|||
Future<void> _sendAccept() async {
|
||||
sas = olm.SAS();
|
||||
commitment = _makeCommitment(sas.get_pubkey(), startCanonicalJson);
|
||||
await send('m.key.verification.accept', {
|
||||
'method': 'm.sas.v1',
|
||||
await request.send('m.key.verification.accept', {
|
||||
'method': type,
|
||||
'key_agreement_protocol': keyAgreementProtocol,
|
||||
'hash': hash,
|
||||
'message_authentication_code': messageAuthenticationCode,
|
||||
|
|
@ -332,7 +570,7 @@ class KeyVerification {
|
|||
}
|
||||
|
||||
Future<void> _sendKey() async {
|
||||
await send('m.key.verification.key', {
|
||||
await request.send('m.key.verification.key', {
|
||||
'key': sas.get_pubkey(),
|
||||
});
|
||||
}
|
||||
|
|
@ -347,21 +585,20 @@ class KeyVerification {
|
|||
return commitment == checkCommitment;
|
||||
}
|
||||
|
||||
Uint8List _makeSas(int bytes) {
|
||||
Uint8List makeSas(int bytes) {
|
||||
var sasInfo = '';
|
||||
if (keyAgreementProtocol == 'curve25519-hkdf-sha256') {
|
||||
final ourInfo = '${client.userID}|${client.deviceID}|${sas.get_pubkey()}|';
|
||||
final theirInfo = '${userId}|${deviceId}|${theirPublicKey}|';
|
||||
sasInfo = 'MATRIX_KEY_VERIFICATION_SAS|' + (startedVerification ? ourInfo + theirInfo : theirInfo + ourInfo) + transactionId;
|
||||
final theirInfo = '${request.userId}|${request.deviceId}|${theirPublicKey}|';
|
||||
sasInfo = 'MATRIX_KEY_VERIFICATION_SAS|' + (request.startedVerification ? ourInfo + theirInfo : theirInfo + ourInfo) + request.transactionId;
|
||||
} else if (keyAgreementProtocol == 'curve25519') {
|
||||
final ourInfo = client.userID + client.deviceID;
|
||||
final theirInfo = userId + deviceId;
|
||||
sasInfo = 'MATRIX_KEY_VERIFICATION_SAS' + (startedVerification ? ourInfo + theirInfo : theirInfo + ourInfo) + transactionId;
|
||||
final theirInfo = request.userId + request.deviceId;
|
||||
sasInfo = 'MATRIX_KEY_VERIFICATION_SAS' + (request.startedVerification ? ourInfo + theirInfo : theirInfo + ourInfo) + request.transactionId;
|
||||
} else {
|
||||
throw 'Unknown key agreement protocol';
|
||||
}
|
||||
print('++++++++++++++++');
|
||||
print(keyAgreementProtocol);
|
||||
// this is needed, else things don't match up? WTF?!
|
||||
print(sasInfo);
|
||||
return sas.generate_bytes(sasInfo, bytes);
|
||||
}
|
||||
|
|
@ -369,8 +606,8 @@ class KeyVerification {
|
|||
Future<void> _sendMac() async {
|
||||
final baseInfo = 'MATRIX_KEY_VERIFICATION_MAC' +
|
||||
client.userID + client.deviceID +
|
||||
userId + deviceId +
|
||||
transactionId;
|
||||
request.userId + request.deviceId +
|
||||
request.transactionId;
|
||||
final mac = <String, String>{};
|
||||
final keyList = <String>[];
|
||||
|
||||
|
|
@ -383,7 +620,7 @@ class KeyVerification {
|
|||
|
||||
keyList.sort();
|
||||
final keys = _calculateMac(keyList.join(','), baseInfo + 'KEY_IDS');
|
||||
await send('m.key.verification.mac', {
|
||||
await request.send('m.key.verification.mac', {
|
||||
'mac': mac,
|
||||
'keys': keys,
|
||||
});
|
||||
|
|
@ -392,19 +629,19 @@ class KeyVerification {
|
|||
Future<void> _processMac() async {
|
||||
final payload = macPayload;
|
||||
final baseInfo = 'MATRIX_KEY_VERIFICATION_MAC' +
|
||||
userId + deviceId +
|
||||
request.userId + request.deviceId +
|
||||
client.userID + client.deviceID +
|
||||
transactionId;
|
||||
request.transactionId;
|
||||
|
||||
final keyList = payload['mac'].keys.toList();
|
||||
keyList.sort();
|
||||
if (payload['keys'] != _calculateMac(keyList.join(','), baseInfo + 'KEY_IDS')) {
|
||||
await cancel('m.key_mismatch');
|
||||
await request.cancel('m.key_mismatch');
|
||||
return;
|
||||
}
|
||||
|
||||
if (!client.userDeviceKeys.containsKey(userId)) {
|
||||
await cancel('m.key_mismatch');
|
||||
if (!client.userDeviceKeys.containsKey(request.userId)) {
|
||||
await request.cancel('m.key_mismatch');
|
||||
return;
|
||||
}
|
||||
final mac = <String, String>{};
|
||||
|
|
@ -413,81 +650,15 @@ class KeyVerification {
|
|||
mac[entry.key] = entry.value;
|
||||
}
|
||||
}
|
||||
await _verifyKeys(mac, (String mac, DeviceKeys device) async {
|
||||
await request.verifyKeys(mac, (String mac, DeviceKeys device) async {
|
||||
return mac == _calculateMac(device.ed25519Key, baseInfo + 'ed25519:' + device.deviceId);
|
||||
});
|
||||
await send('m.key.verification.done', {});
|
||||
if (state != KeyVerificationState.error) {
|
||||
_setState(KeyVerificationState.done);
|
||||
await request.send('m.key.verification.done', {});
|
||||
if (request.state != KeyVerificationState.error) {
|
||||
request.setState(KeyVerificationState.done);
|
||||
}
|
||||
}
|
||||
|
||||
Future<void> _verifyKeys(Map<String, String> keys, Future<bool> Function(String, DeviceKeys) verifier) async {
|
||||
final verifiedDevices = <String>[];
|
||||
|
||||
if (!client.userDeviceKeys.containsKey(userId)) {
|
||||
await cancel('m.key_mismatch');
|
||||
return;
|
||||
}
|
||||
for (final entry in keys.entries) {
|
||||
final keyId = entry.key;
|
||||
final verifyDeviceId = keyId.substring('ed25519:'.length);
|
||||
final keyInfo = entry.value;
|
||||
if (client.userDeviceKeys[userId].deviceKeys.containsKey(verifyDeviceId)) {
|
||||
if (!(await verifier(keyInfo, client.userDeviceKeys[userId].deviceKeys[verifyDeviceId]))) {
|
||||
await cancel('m.key_mismatch');
|
||||
return;
|
||||
}
|
||||
verifiedDevices.add(verifyDeviceId);
|
||||
} else {
|
||||
// TODO: we would check here if what we are verifying is actually a
|
||||
// cross-signing key and not a "normal" device key
|
||||
}
|
||||
}
|
||||
// okay, we reached this far, so all the devices are verified!
|
||||
for (final verifyDeviceId in verifiedDevices) {
|
||||
await client.userDeviceKeys[userId].deviceKeys[verifyDeviceId].setVerified(true, client);
|
||||
}
|
||||
}
|
||||
|
||||
String _calculateMac(String input, String info) {
|
||||
if (messageAuthenticationCode == 'hkdf-hmac-sha256') {
|
||||
return sas.calculate_mac(input, info);
|
||||
} else {
|
||||
throw 'Unknown message authentification code';
|
||||
}
|
||||
}
|
||||
|
||||
Future<bool> verifyActivity() async {
|
||||
if (lastActivity != null && lastActivity.add(Duration(minutes: 10)).isAfter(DateTime.now())) {
|
||||
lastActivity = DateTime.now();
|
||||
return true;
|
||||
}
|
||||
await cancel('m.timeout');
|
||||
return false;
|
||||
}
|
||||
|
||||
Future<bool> verifyLastStep(List<String> checkLastStep) async {
|
||||
if (!(await verifyActivity())) {
|
||||
return false;
|
||||
}
|
||||
if (checkLastStep.contains(lastStep)) {
|
||||
return true;
|
||||
}
|
||||
await cancel('m.unexpected_message');
|
||||
return false;
|
||||
}
|
||||
|
||||
Future<void> cancel([String code = 'm.unknown']) async {
|
||||
await send('m.key.verification.cancel', {
|
||||
'reason': code,
|
||||
'code': code,
|
||||
});
|
||||
canceled = true;
|
||||
canceledCode = code;
|
||||
_setState(KeyVerificationState.error);
|
||||
}
|
||||
|
||||
String _makeCommitment(String pubKey, String canonicalJson) {
|
||||
if (hash == 'sha256') {
|
||||
final olmutil = olm.Utility();
|
||||
|
|
@ -498,79 +669,13 @@ class KeyVerification {
|
|||
throw 'Unknown hash method';
|
||||
}
|
||||
|
||||
void _makePayload(Map<String, dynamic> payload) {
|
||||
payload['from_device'] = client.deviceID;
|
||||
if (transactionId != null) {
|
||||
if (room != null) {
|
||||
payload['m.relates_to'] = {
|
||||
'rel_type': 'm.reference',
|
||||
'event_id': transactionId,
|
||||
};
|
||||
} else {
|
||||
payload['transaction_id'] = transactionId;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
Future<void> send(String type, Map<String, dynamic> payload) async {
|
||||
_makePayload(payload);
|
||||
print('[Key Verification] Sending type ${type}: ' + payload.toString());
|
||||
print('[Key Verification] Sending to ${userId} device ${deviceId}');
|
||||
if (room != null) {
|
||||
if (['m.key.verification.request'].contains(type)) {
|
||||
payload['msgtype'] = type;
|
||||
payload['to'] = userId;
|
||||
payload['body'] = 'Attempting verification request. (${type}) Apparently your client doesn\'t support this';
|
||||
type = 'm.room.message';
|
||||
}
|
||||
final newTransactionId = await room.sendEvent(payload, type: type);
|
||||
if (transactionId == null) {
|
||||
transactionId = newTransactionId;
|
||||
client.addKeyVerificationRequest(this);
|
||||
}
|
||||
String _calculateMac(String input, String info) {
|
||||
if (messageAuthenticationCode == 'hkdf-hmac-sha256') {
|
||||
return sas.calculate_mac(input, info);
|
||||
} else {
|
||||
await client.sendToDevice([client.userDeviceKeys[userId].deviceKeys[deviceId]], type, payload);
|
||||
throw 'Unknown message authentification code';
|
||||
}
|
||||
}
|
||||
|
||||
void _setState(KeyVerificationState newState) {
|
||||
if (state != KeyVerificationState.error) {
|
||||
state = newState;
|
||||
}
|
||||
if (onUpdate != null) {
|
||||
onUpdate();
|
||||
}
|
||||
}
|
||||
|
||||
List<String> _intersect(List<String> a, List<dynamic> b) {
|
||||
final res = <String>[];
|
||||
for (final v in a) {
|
||||
if (b.contains(v)) {
|
||||
res.add(v);
|
||||
}
|
||||
}
|
||||
return res;
|
||||
}
|
||||
|
||||
List<int> _bytesToInt(Uint8List bytes, int totalBits) {
|
||||
final ret = <int>[];
|
||||
var current = 0;
|
||||
var numBits = 0;
|
||||
for (final byte in bytes) {
|
||||
for (final bit in [7, 6, 5, 4, 3, 2, 1, 0]) {
|
||||
numBits++;
|
||||
if ((byte & (1 << bit)) > 0) {
|
||||
current += 1 << (totalBits - numBits);
|
||||
}
|
||||
if (numBits >= totalBits) {
|
||||
ret.add(current);
|
||||
current = 0;
|
||||
numBits = 0;
|
||||
}
|
||||
}
|
||||
}
|
||||
return ret;
|
||||
}
|
||||
}
|
||||
|
||||
const _emojiMap = [
|
||||
|
|
|
|||
Loading…
Reference in a new issue