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WIP to add logging to decryption and fetching key backups

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This commit is contained in:
Bruno Windels 2021-03-15 12:56:40 +01:00
parent 744ac6b885
commit fcc06b2754
5 changed files with 59 additions and 55 deletions
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57
src/matrix/e2ee/RoomEncryption.js
View file

@ -56,7 +56,7 @@ export class RoomEncryption {
this._sessionBackup = sessionBackup;
}
async restoreMissingSessionsFromBackup(entries) {
async restoreMissingSessionsFromBackup(entries, log) {
const events = entries.filter(e => e.isEncrypted && !e.isDecrypted && e.event).map(e => e.event);
const eventsBySession = groupEventsBySession(events);
const groups = Array.from(eventsBySession.values());
@ -69,7 +69,7 @@ export class RoomEncryption {
// start with last sessions which should be for the last items in the timeline
for (var i = missingSessions.length - 1; i >= 0; i--) {
const session = missingSessions[i];
await this._requestMissingSessionFromBackup(session.senderKey, session.sessionId);
await log.wrap("session", log => this._requestMissingSessionFromBackup(session.senderKey, session.sessionId, log));
}
}
}
@ -98,9 +98,6 @@ export class RoomEncryption {
return shouldFlush;
}
// this happens before entries exists, as they are created by the syncwriter
// but we want to be able to map it back to something in the timeline easily
// when retrying decryption.
async prepareDecryptAll(events, newKeys, source, txn) {
const errors = new Map();
const validEvents = [];
@ -137,7 +134,7 @@ export class RoomEncryption {
return new DecryptionPreparation(preparation, errors, source, this, events);
}
async _processDecryptionResults(events, results, errors, source, txn) {
async _processDecryptionResults(events, results, errors, source, txn, log) {
const missingSessionEvents = events.filter(event => {
const error = errors.get(event.event_id);
return error?.code === "MEGOLM_NO_SESSION";
@ -145,20 +142,22 @@ export class RoomEncryption {
if (!missingSessionEvents.length) {
return;
}
const eventsBySession = groupEventsBySession(events);
const missingEventsBySession = groupEventsBySession(missingSessionEvents);
if (source === DecryptionSource.Sync) {
await Promise.all(Array.from(eventsBySession.values()).map(async group => {
// store missing event ids if received from sync
await Promise.all(Array.from(missingEventsBySession.values()).map(async group => {
const eventIds = group.events.map(e => e.event_id);
return this._megolmDecryption.addMissingKeyEventIds(
this._room.id, group.senderKey, group.sessionId, eventIds, txn);
}));
}
// TODO: do proper logging here
// run detached
Promise.resolve().then(async () => {
log.refDetached("check key backup", async log => {
// if the message came from sync, wait 10s to see if the room key arrives late,
// and only after that proceed to request from backup
log.set("source", source);
log.set("events", missingSessionEvents.length);
log.set("sessions", missingEventsBySession.size);
if (source === DecryptionSource.Sync) {
await this._clock.createTimeout(10000).elapsed();
if (this._disposed) {
@ -166,18 +165,15 @@ export class RoomEncryption {
}
// now check which sessions have been received already
const txn = await this._storage.readTxn([this._storage.storeNames.inboundGroupSessions]);
await Promise.all(Array.from(eventsBySession).map(async ([key, group]) => {
await Promise.all(Array.from(missingEventsBySession).map(async ([key, group]) => {
if (await this._megolmDecryption.hasSession(this._room.id, group.senderKey, group.sessionId, txn)) {
eventsBySession.delete(key);
missingEventsBySession.delete(key);
}
}));
}
await Promise.all(Array.from(eventsBySession.values()).map(group => {
return this._requestMissingSessionFromBackup(group.senderKey, group.sessionId);
await Promise.all(Array.from(missingEventsBySession.values()).map(group => {
return log.wrap("session", log => this._requestMissingSessionFromBackup(group.senderKey, group.sessionId, log));
}));
}).catch(err => {
console.log("failed to fetch missing session from key backup");
console.error(err);
});
}
@ -194,18 +190,21 @@ export class RoomEncryption {
}
}
async _requestMissingSessionFromBackup(senderKey, sessionId) {
async _requestMissingSessionFromBackup(senderKey, sessionId, log) {
// show prompt to enable secret storage
if (!this._sessionBackup) {
log.set("enabled", false);
this._notifyMissingMegolmSession();
return;
}
log.set("id", sessionId);
log.set("senderKey", senderKey);
try {
const session = await this._sessionBackup.getSession(this._room.id, sessionId);
const session = await this._sessionBackup.getSession(this._room.id, sessionId, log);
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});
log.set("wrong_sender_key", session["sender_key"]);
log.logLevel = log.level.Warn;
return;
}
let roomKey = this._megolmDecryption.roomKeyFromBackup(this._room.id, sessionId, session);
@ -216,6 +215,7 @@ export class RoomEncryption {
const txn = await this._storage.readWriteTxn([this._storage.storeNames.inboundGroupSessions]);
try {
keyIsBestOne = await this._megolmDecryption.writeRoomKey(roomKey, txn);
log.set("isBetter", keyIsBestOne);
if (keyIsBestOne) {
retryEventIds = roomKey.eventIds;
}
@ -230,15 +230,18 @@ export class RoomEncryption {
roomKey.dispose();
}
if (keyIsBestOne) {
await this._room.notifyRoomKey(roomKey, retryEventIds || []);
await log.wrap("retryDecryption", log => this._room.notifyRoomKey(roomKey, retryEventIds || [], log));
}
}
} else if (session?.algorithm) {
console.info(`Backed-up session of unknown algorithm: ${session.algorithm}`);
log.set("unknown algorithm", session.algorithm);
}
} catch (err) {
if (!(err.name === "HomeServerError" && err.errcode === "M_NOT_FOUND")) {
console.error(`Could not get session ${sessionId} from backup`, err);
log.set("not_found", true);
} else {
log.error = err;
log.logLevel = log.level.Error;
}
}
}
@ -485,10 +488,10 @@ class DecryptionChanges {
this._events = events;
}
async write(txn) {
async write(txn, log) {
const {results, errors} = await this._megolmDecryptionChanges.write(txn);
mergeMap(this._extraErrors, errors);
await this._roomEncryption._processDecryptionResults(this._events, results, errors, this._source, txn);
await this._roomEncryption._processDecryptionResults(this._events, results, errors, this._source, txn, log);
return new BatchDecryptionResult(results, errors, this._roomEncryption);
}
}

4
src/matrix/e2ee/megolm/SessionBackup.js
View file

@ -21,8 +21,8 @@ export class SessionBackup {
this._hsApi = hsApi;
}
async getSession(roomId, sessionId) {
const sessionResponse = await this._hsApi.roomKeyForRoomAndSession(this._backupInfo.version, roomId, sessionId).response();
async getSession(roomId, sessionId, log) {
const sessionResponse = await this._hsApi.roomKeyForRoomAndSession(this._backupInfo.version, roomId, sessionId, {log}).response();
const sessionInfo = this._decryption.decrypt(
sessionResponse.session_data.ephemeral,
sessionResponse.session_data.mac,

25
src/matrix/room/Room.js
View file

@ -29,6 +29,7 @@ import {EventEntry} from "./timeline/entries/EventEntry.js";
import {ObservedEventMap} from "./ObservedEventMap.js";
import {AttachmentUpload} from "./AttachmentUpload.js";
import {DecryptionSource} from "../e2ee/common.js";
import {ensureLogItem} from "../../logging/utils.js";
const EVENT_ENCRYPTED_TYPE = "m.room.encrypted";
@ -81,7 +82,7 @@ export class Room extends EventEmitter {
* @param {Array<string>} eventIds any event ids that should be retried. There might be more in the timeline though for this key.
* @return {Promise}
*/
async notifyRoomKey(roomKey, eventIds) {
async notifyRoomKey(roomKey, eventIds, log) {
if (!this._roomEncryption) {
return;
}
@ -95,7 +96,7 @@ export class Room extends EventEmitter {
retryEntries = retryEntries.concat(retryTimelineEntries);
}
if (retryEntries.length) {
const decryptRequest = this._decryptEntries(DecryptionSource.Retry, retryEntries, txn);
const decryptRequest = this._decryptEntries(DecryptionSource.Retry, retryEntries, txn, log);
// this will close txn while awaiting decryption
await decryptRequest.complete();
@ -125,8 +126,8 @@ export class Room extends EventEmitter {
* Used for decrypting when loading/filling the timeline, and retrying decryption,
* not during sync, where it is split up during the multiple phases.
*/
_decryptEntries(source, entries, inboundSessionTxn = null) {
const request = new DecryptionRequest(async r => {
_decryptEntries(source, entries, inboundSessionTxn = null, log = null) {
const request = new DecryptionRequest(async (r, log) => {
if (!inboundSessionTxn) {
inboundSessionTxn = await this._storage.readTxn([this._storage.storeNames.inboundGroupSessions]);
}
@ -148,7 +149,7 @@ export class Room extends EventEmitter {
const writeTxn = await this._storage.readWriteTxn(stores);
let decryption;
try {
decryption = await changes.write(writeTxn);
decryption = await changes.write(writeTxn, log);
if (isTimelineOpen) {
await decryption.verifySenders(writeTxn);
}
@ -162,7 +163,7 @@ export class Room extends EventEmitter {
if (this._observedEvents) {
this._observedEvents.updateEvents(entries);
}
});
}, this._platform.logger, log);
return request;
}
@ -248,7 +249,7 @@ export class Room extends EventEmitter {
await log.wrap("syncWriter", log => this._syncWriter.writeSync(roomResponse, txn, log), log.level.Detail);
let allEntries = newEntries;
if (decryptChanges) {
const decryption = await decryptChanges.write(txn);
const decryption = await log.wrap("decryptChanges", log => decryptChanges.write(txn, log));
log.set("decryptionResults", decryption.results.size);
log.set("decryptionErrors", decryption.errors.size);
if (this._isTimelineOpen) {
@ -510,7 +511,7 @@ export class Room extends EventEmitter {
}
await txn.complete();
if (this._roomEncryption) {
const decryptRequest = this._decryptEntries(DecryptionSource.Timeline, gapResult.entries);
const decryptRequest = this._decryptEntries(DecryptionSource.Timeline, gapResult.entries, log);
await decryptRequest.complete();
}
// once txn is committed, update in-memory state & emit events
@ -588,7 +589,7 @@ export class Room extends EventEmitter {
this._roomEncryption?.enableSessionBackup(sessionBackup);
// TODO: do we really want to do this every time you open the app?
if (this._timeline) {
this._roomEncryption.restoreMissingSessionsFromBackup(this._timeline.remoteEntries);
this._roomEncryption.restoreMissingSessionsFromBackup(this._timeline.remoteEntries, ensureLogItem());
}
}
@ -675,7 +676,7 @@ export class Room extends EventEmitter {
if (this._roomEncryption) {
this._timeline.enableEncryption(this._decryptEntries.bind(this, DecryptionSource.Timeline));
}
await this._timeline.load(this._user);
await this._timeline.load(this._user, log);
return this._timeline;
});
}
@ -745,10 +746,10 @@ export class Room extends EventEmitter {
}
class DecryptionRequest {
constructor(decryptFn) {
constructor(decryptFn, logger, log) {
this._cancelled = false;
this.preparation = null;
this._promise = decryptFn(this);
this._promise = logger.wrapOrRun(log, "decryptEntries", log => decryptFn(this, log));
}
complete() {

4
src/matrix/room/timeline/Timeline.js
View file

@ -45,7 +45,7 @@ export class Timeline {
}
/** @package */
async load(user) {
async load(user, log) {
const txn = await this._storage.readTxn(this._timelineReader.readTxnStores.concat(this._storage.storeNames.roomMembers));
const memberData = await txn.roomMembers.get(this._roomId, user.id);
this._ownMember = new RoomMember(memberData);
@ -54,7 +54,7 @@ export class Timeline {
// if they are populated already, the sender profile would be empty
// 30 seems to be a good amount to fill the entire screen
const readerRequest = this._disposables.track(this._timelineReader.readFromEnd(30, txn));
const readerRequest = this._disposables.track(this._timelineReader.readFromEnd(30, txn, log));
try {
const entries = await readerRequest.complete();
this._remoteEntries.setManySorted(entries);

24
src/matrix/room/timeline/persistence/TimelineReader.js
View file

@ -20,9 +20,9 @@ import {EventEntry} from "../entries/EventEntry.js";
import {FragmentBoundaryEntry} from "../entries/FragmentBoundaryEntry.js";
class ReaderRequest {
constructor(fn) {
constructor(fn, log) {
this.decryptRequest = null;
this._promise = fn(this);
this._promise = fn(this, log);
}
complete() {
@ -106,15 +106,15 @@ export class TimelineReader {
return stores;
}
readFrom(eventKey, direction, amount) {
return new ReaderRequest(async r => {
readFrom(eventKey, direction, amount, log) {
return new ReaderRequest(async (r, log) => {
const txn = await this._storage.readTxn(this.readTxnStores);
return await this._readFrom(eventKey, direction, amount, r, txn);
});
return await this._readFrom(eventKey, direction, amount, r, txn, log);
}, log);
}
readFromEnd(amount, existingTxn = null) {
return new ReaderRequest(async r => {
readFromEnd(amount, existingTxn = null, log) {
return new ReaderRequest(async (r, log) => {
const txn = existingTxn || await this._storage.readTxn(this.readTxnStores);
const liveFragment = await txn.timelineFragments.liveFragment(this._roomId);
let entries;
@ -125,17 +125,17 @@ export class TimelineReader {
this._fragmentIdComparer.add(liveFragment);
const liveFragmentEntry = FragmentBoundaryEntry.end(liveFragment, this._fragmentIdComparer);
const eventKey = liveFragmentEntry.asEventKey();
entries = await this._readFrom(eventKey, Direction.Backward, amount, r, txn);
entries = await this._readFrom(eventKey, Direction.Backward, amount, r, txn, log);
entries.unshift(liveFragmentEntry);
}
return entries;
});
}, log);
}
async _readFrom(eventKey, direction, amount, r, txn) {
async _readFrom(eventKey, direction, amount, r, txn, log) {
const entries = await readRawTimelineEntriesWithTxn(this._roomId, eventKey, direction, amount, this._fragmentIdComparer, txn);
if (this._decryptEntries) {
r.decryptRequest = this._decryptEntries(entries, txn);
r.decryptRequest = this._decryptEntries(entries, txn, log);
try {
await r.decryptRequest.complete();
} finally {