138 lines
4.5 KiB
Dart
138 lines
4.5 KiB
Dart
/*
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* Famedly Matrix SDK
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* Copyright (C) 2019, 2020, 2021 Famedly GmbH
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as
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* published by the Free Software Foundation, either version 3 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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import 'package:matrix/encryption/utils/stored_inbound_group_session.dart';
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import 'package:olm/olm.dart' as olm;
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import '../../matrix.dart';
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class SessionKey {
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/// The raw json content of the key
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Map<String, dynamic> content;
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/// Map of stringified-index to event id, so that we can detect replay attacks
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Map<String, String> indexes;
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/// Map of userId to map of deviceId to index, that we know that device receivied, e.g. sending it ourself.
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/// Used for automatically answering key requests
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Map<String, Map<String, int>> allowedAtIndex;
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/// Underlying olm [InboundGroupSession] object
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olm.InboundGroupSession inboundGroupSession;
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/// Key for libolm pickle / unpickle
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final String key;
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/// Forwarding keychain
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List<String> get forwardingCurve25519KeyChain =>
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(content['forwarding_curve25519_key_chain'] != null
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? List<String>.from(content['forwarding_curve25519_key_chain'])
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: null) ??
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<String>[];
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/// Claimed keys of the original sender
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Map<String, String> senderClaimedKeys;
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/// Sender curve25519 key
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String senderKey;
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/// Is this session valid?
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bool get isValid => inboundGroupSession != null;
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/// roomId for this session
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String roomId;
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/// Id of this session
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String sessionId;
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SessionKey(
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{this.content,
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this.inboundGroupSession,
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this.key,
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this.indexes,
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this.allowedAtIndex,
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this.roomId,
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this.sessionId,
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String senderKey,
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Map<String, String> senderClaimedKeys}) {
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_setSenderKey(senderKey);
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_setSenderClaimedKeys(senderClaimedKeys);
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indexes ??= <String, String>{};
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allowedAtIndex ??= <String, Map<String, int>>{};
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}
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SessionKey.fromDb(StoredInboundGroupSession dbEntry, String key) : key = key {
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final parsedContent = Event.getMapFromPayload(dbEntry.content);
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final parsedIndexes = Event.getMapFromPayload(dbEntry.indexes);
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final parsedAllowedAtIndex =
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Event.getMapFromPayload(dbEntry.allowedAtIndex);
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final parsedSenderClaimedKeys =
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Event.getMapFromPayload(dbEntry.senderClaimedKeys);
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content = parsedContent;
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// we need to try...catch as the map used to be <String, int> and that will throw an error.
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try {
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indexes = parsedIndexes != null
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? Map<String, String>.from(parsedIndexes)
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: <String, String>{};
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} catch (e) {
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indexes = <String, String>{};
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}
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try {
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allowedAtIndex = parsedAllowedAtIndex != null
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? Map<String, Map<String, int>>.from(parsedAllowedAtIndex
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.map((k, v) => MapEntry(k, Map<String, int>.from(v))))
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: <String, Map<String, int>>{};
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} catch (e) {
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allowedAtIndex = <String, Map<String, int>>{};
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}
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roomId = dbEntry.roomId;
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sessionId = dbEntry.sessionId;
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_setSenderKey(dbEntry.senderKey);
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_setSenderClaimedKeys(Map<String, String>.from(parsedSenderClaimedKeys));
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inboundGroupSession = olm.InboundGroupSession();
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try {
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inboundGroupSession.unpickle(key, dbEntry.pickle);
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} catch (e, s) {
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dispose();
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Logs().e('[LibOlm] Unable to unpickle inboundGroupSession', e, s);
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}
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}
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void _setSenderKey(String key) {
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senderKey = key ?? content['sender_key'] ?? '';
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}
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void _setSenderClaimedKeys(Map<String, String> keys) {
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senderClaimedKeys = (keys != null && keys.isNotEmpty)
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? keys
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: (content['sender_claimed_keys'] is Map
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? Map<String, String>.from(content['sender_claimed_keys'])
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: (content['sender_claimed_ed25519_key'] is String
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? <String, String>{
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'ed25519': content['sender_claimed_ed25519_key']
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}
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: <String, String>{}));
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}
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void dispose() {
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inboundGroupSession?.free();
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inboundGroupSession = null;
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}
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}
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