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don't throw when trying to restore session from backup, check sender key

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This commit is contained in:
Bruno Windels 2020-09-17 17:57:52 +02:00
parent a205ae8841
commit 915925d6ee
1 changed files with 28 additions and 22 deletions
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50
src/matrix/e2ee/RoomEncryption.js
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@ -137,39 +137,45 @@ export class RoomEncryption {
let eventIds = this._eventIdsByMissingSession.get(key);
// new missing session
if (!eventIds) {
this._requestMissingSessionFromBackup(sessionId).catch(err => {
console.error(`Could not get session ${sessionId} from backup`, err);
});
this._requestMissingSessionFromBackup(senderKey, sessionId);
eventIds = new Set();
this._eventIdsByMissingSession.set(key, eventIds);
}
eventIds.add(event.event_id);
}
async _requestMissingSessionFromBackup(sessionId) {
async _requestMissingSessionFromBackup(senderKey, sessionId) {
if (!this._sessionBackup) {
// somehow prompt for passphrase here
this._notifyMissingMegolmSession();
return;
}
const session = await this._sessionBackup.getSession(this._room.id, sessionId);
if (session?.algorithm === MEGOLM_ALGORITHM) {
const txn = await this._storage.readWriteTxn([this._storage.storeNames.inboundGroupSessions]);
let roomKey;
try {
roomKey = await this._megolmDecryption.addRoomKeyFromBackup(
this._room.id, sessionId, session, txn);
} catch (err) {
txn.abort();
throw err;
}
await txn.complete();
try {
const session = await this._sessionBackup.getSession(this._room.id, sessionId);
if (session?.algorithm === MEGOLM_ALGORITHM) {
if (session["sender_key"] !== senderKey) {
console.warn("Got session key back from backup with different sender key, ignoring", {session, senderKey});
return;
}
const txn = await this._storage.readWriteTxn([this._storage.storeNames.inboundGroupSessions]);
let roomKey;
try {
roomKey = await this._megolmDecryption.addRoomKeyFromBackup(
this._room.id, sessionId, session, txn);
} catch (err) {
txn.abort();
throw err;
}
await txn.complete();
if (roomKey) {
// this will call into applyRoomKeys below
await this._room.notifyRoomKeys([roomKey]);
if (roomKey) {
// this will call into applyRoomKeys below
await this._room.notifyRoomKeys([roomKey]);
}
} else if (session?.algorithm) {
console.info(`Backed-up session of unknown algorithm: ${session.algorithm}`);
}
} else if (session?.algorithm) {
console.info(`Backed-up session of unknown algorithm: ${session.algorithm}`);
} catch (err) {
console.error(`Could not get session ${sessionId} from backup`, err);
}
}