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convert SessionDecryption to TS and adapt to use KeyLoader

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This commit is contained in:
Bruno Windels 2021-10-22 17:48:04 +02:00
parent b55930f084
commit ac23119838
4 changed files with 106 additions and 93 deletions
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4
src/matrix/e2ee/DecryptionResult.js
View file

@ -29,10 +29,10 @@ limitations under the License.
export class DecryptionResult {
constructor(event, senderCurve25519Key, claimedKeys) {
constructor(event, senderCurve25519Key, claimedEd25519Key) {
this.event = event;
this.senderCurve25519Key = senderCurve25519Key;
this.claimedEd25519Key = claimedKeys.ed25519;
this.claimedEd25519Key = claimedEd25519Key;
this._device = null;
this._roomTracked = true;
}

90
src/matrix/e2ee/megolm/decryption/SessionDecryption.js
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@ -1,90 +0,0 @@
/*
Copyright 2020 The Matrix.org Foundation C.I.C.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
import {DecryptionResult} from "../../DecryptionResult.js";
import {DecryptionError} from "../../common.js";
import {ReplayDetectionEntry} from "./ReplayDetectionEntry.js";
/**
* Does the actual decryption of all events for a given megolm session in a batch
*/
export class SessionDecryption {
constructor(sessionInfo, events, olmWorker) {
sessionInfo.retain();
this._sessionInfo = sessionInfo;
this._events = events;
this._olmWorker = olmWorker;
this._decryptionRequests = olmWorker ? [] : null;
}
async decryptAll() {
const replayEntries = [];
const results = new Map();
let errors;
const roomId = this._sessionInfo.roomId;
await Promise.all(this._events.map(async event => {
try {
const {session} = this._sessionInfo;
const ciphertext = event.content.ciphertext;
let decryptionResult;
if (this._olmWorker) {
const request = this._olmWorker.megolmDecrypt(session, ciphertext);
this._decryptionRequests.push(request);
decryptionResult = await request.response();
} else {
decryptionResult = session.decrypt(ciphertext);
}
const plaintext = decryptionResult.plaintext;
const messageIndex = decryptionResult.message_index;
let payload;
try {
payload = JSON.parse(plaintext);
} catch (err) {
throw new DecryptionError("PLAINTEXT_NOT_JSON", event, {plaintext, err});
}
if (payload.room_id !== roomId) {
throw new DecryptionError("MEGOLM_WRONG_ROOM", event,
{encryptedRoomId: payload.room_id, eventRoomId: roomId});
}
replayEntries.push(new ReplayDetectionEntry(session.session_id(), messageIndex, event));
const result = new DecryptionResult(payload, this._sessionInfo.senderKey, this._sessionInfo.claimedKeys);
results.set(event.event_id, result);
} catch (err) {
// ignore AbortError from cancelling decryption requests in dispose method
if (err.name === "AbortError") {
return;
}
if (!errors) {
errors = new Map();
}
errors.set(event.event_id, err);
}
}));
return {results, errors, replayEntries};
}
dispose() {
if (this._decryptionRequests) {
for (const r of this._decryptionRequests) {
r.abort();
}
}
// TODO: cancel decryptions here
this._sessionInfo.release();
}
}

103
src/matrix/e2ee/megolm/decryption/SessionDecryption.ts Normal file
View file

@ -0,0 +1,103 @@
/*
Copyright 2020 The Matrix.org Foundation C.I.C.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
import {DecryptionResult} from "../../DecryptionResult.js";
import {DecryptionError} from "../../common.js";
import {ReplayDetectionEntry} from "./ReplayDetectionEntry";
import type {IRoomKey} from "./RoomKey.js";
import type {KeyLoader, OlmDecryptionResult} from "./KeyLoader";
import type {OlmWorker} from "../../OlmWorker";
import type {TimelineEvent} from "../../../storage/types";
interface DecryptAllResult {
readonly results: Map<string, DecryptionResult>;
readonly errors?: Map<string, Error>;
readonly replayEntries: ReplayDetectionEntry[];
}
/**
* Does the actual decryption of all events for a given megolm session in a batch
*/
export class SessionDecryption {
private key: IRoomKey;
private events: TimelineEvent[];
private keyLoader: KeyLoader;
private olmWorker?: OlmWorker;
private decryptionRequests?: any[];
constructor(key: IRoomKey, events: TimelineEvent[], olmWorker: OlmWorker | undefined, keyLoader: KeyLoader) {
this.key = key;
this.events = events;
this.olmWorker = olmWorker;
this.keyLoader = keyLoader;
this.decryptionRequests = olmWorker ? [] : undefined;
}
async decryptAll(): Promise<DecryptAllResult> {
const replayEntries: ReplayDetectionEntry[] = [];
const results: Map<string, DecryptionResult> = new Map();
let errors: Map<string, Error> | undefined;
await this.keyLoader.useKey(this.key, async session => {
for (const event of this.events) {
try {
const ciphertext = event.content.ciphertext as string;
let decryptionResult: OlmDecryptionResult | undefined;
// TODO: pass all cipthertexts in one go to the megolm worker and don't deserialize the key until in the worker?
if (this.olmWorker) {
const request = this.olmWorker.megolmDecrypt(session, ciphertext);
this.decryptionRequests!.push(request);
decryptionResult = await request.response();
} else {
decryptionResult = session.decrypt(ciphertext);
}
const {plaintext} = decryptionResult!;
let payload;
try {
payload = JSON.parse(plaintext);
} catch (err) {
throw new DecryptionError("PLAINTEXT_NOT_JSON", event, {plaintext, err});
}
if (payload.room_id !== this.key.roomId) {
throw new DecryptionError("MEGOLM_WRONG_ROOM", event,
{encryptedRoomId: payload.room_id, eventRoomId: this.key.roomId});
}
replayEntries.push(new ReplayDetectionEntry(this.key.sessionId, decryptionResult!.message_index, event));
const result = new DecryptionResult(payload, this.key.senderKey, this.key.claimedEd25519Key);
results.set(event.event_id, result);
} catch (err) {
// ignore AbortError from cancelling decryption requests in dispose method
if (err.name === "AbortError") {
return;
}
if (!errors) {
errors = new Map();
}
errors.set(event.event_id, err);
}
}
});
return {results, errors, replayEntries};
}
dispose() {
if (this.decryptionRequests) {
for (const r of this.decryptionRequests) {
r.abort();
}
}
}
}

2
src/matrix/e2ee/olm/Decryption.js
View file

@ -150,7 +150,7 @@ export class Decryption {
throw new DecryptionError("PLAINTEXT_NOT_JSON", event, {plaintext, error});
}
this._validatePayload(payload, event);
return new DecryptionResult(payload, senderKey, payload.keys);
return new DecryptionResult(payload, senderKey, payload.keys.ed25519);
} else {
throw new DecryptionError("OLM_NO_MATCHING_SESSION", event,
{knownSessionIds: senderKeyDecryption.sessions.map(s => s.id)});