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Compact LD-signed activities against well-known context

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This should defend against some spoofing attacks, see also
https://nvd.nist.gov/vuln/detail/CVE-2022-24307 for Mastodon,
febb499fcb
from Iceshrimp and
e790d6be90
for Firefish

Thanks to @tesaguri@fedibird.com for reporting and providing the patch.
This commit is contained in:
dakkar 2024-04-30 10:12:54 +01:00
parent e0afeff248
commit 6ae01e28aa
4 changed files with 70 additions and 44 deletions
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14
packages/backend/src/queue/processors/InboxProcessorService.ts
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@ -15,6 +15,7 @@ import InstanceChart from '@/core/chart/charts/instance.js';
import ApRequestChart from '@/core/chart/charts/ap-request.js';
import FederationChart from '@/core/chart/charts/federation.js';
import { getApId } from '@/core/activitypub/type.js';
import type { IActivity } from '@/core/activitypub/type.js';
import type { MiRemoteUser } from '@/models/User.js';
import type { MiUserPublickey } from '@/models/UserPublickey.js';
import { ApDbResolverService } from '@/core/activitypub/ApDbResolverService.js';
@ -52,7 +53,7 @@ export class InboxProcessorService {
@bindThis
public async process(job: Bull.Job<InboxJobData>): Promise<string> {
const signature = job.data.signature; // HTTP-signature
const activity = job.data.activity;
let activity = job.data.activity;
//#region Log
const info = Object.assign({}, activity);
@ -150,6 +151,17 @@ export class InboxProcessorService {
throw new Bull.UnrecoverableError('skip: LD-Signatureの検証に失敗しました');
}
// アクティビティを正規化
delete activity.signature;
try {
activity = await ldSignature.compact(activity) as IActivity;
} catch (e) {
throw new Bull.UnrecoverableError(`skip: failed to compact activity: ${e}`);
}
// TODO: 元のアクティビティと非互換な形に正規化される場合は転送をスキップする
// https://github.com/mastodon/mastodon/blob/664b0ca/app/services/activitypub/process_collection_service.rb#L24-L29
activity.signature = ldSignature;
// もう一度actorチェック
if (authUser.user.uri !== activity.actor) {
throw new Bull.UnrecoverableError(`skip: LD-Signature user(${authUser.user.uri}) !== activity.actor(${activity.actor})`);