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forkbomb DOS mitigation

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This commit is contained in:
syuilo 2022-12-03 18:42:06 +09:00
parent a2a1636c10
commit 58a3a0b7d4
4 changed files with 22 additions and 17 deletions
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8
packages/backend/src/remote/activitypub/kernel/update/index.ts
View File

@ -10,7 +10,7 @@ import { updatePerson } from '../../models/person.js';
*/
export default async (actor: CacheableRemoteUser, activity: IUpdate): Promise<string> => {
if ('actor' in activity && actor.uri !== activity.actor) {
return `skip: invalid actor`;
return 'skip: invalid actor';
}
apLogger.debug('Update');
@ -24,10 +24,10 @@ export default async (actor: CacheableRemoteUser, activity: IUpdate): Promise<st
if (isActor(object)) {
await updatePerson(actor.uri!, resolver, object);
return `ok: Person updated`;
return 'ok: Person updated';
} else if (getApType(object) === 'Question') {
await updateQuestion(object).catch(e => console.log(e));
return `ok: Question updated`;
await updateQuestion(object, resolver).catch(e => console.log(e));
return 'ok: Question updated';
} else {
return `skip: Unknown type: ${getApType(object)}`;
}

8
packages/backend/src/remote/activitypub/models/person.ts
View File

@ -271,7 +271,7 @@ export async function createPerson(uri: string, resolver?: Resolver): Promise<Us
});
//#endregion
await updateFeatured(user!.id).catch(err => logger.error(err));
await updateFeatured(user!.id, resolver).catch(err => logger.error(err));
return user!;
}
@ -384,7 +384,7 @@ export async function updatePerson(uri: string, resolver?: Resolver | null, hint
followerSharedInbox: person.sharedInbox || (person.endpoints ? person.endpoints.sharedInbox : undefined),
});
await updateFeatured(exist.id).catch(err => logger.error(err));
await updateFeatured(exist.id, resolver).catch(err => logger.error(err));
}
/**
@ -462,14 +462,14 @@ export function analyzeAttachments(attachments: IObject | IObject[] | undefined)
return { fields, services };
}
export async function updateFeatured(userId: User['id']) {
export async function updateFeatured(userId: User['id'], resolver?: Resolver) {
const user = await Users.findOneByOrFail({ id: userId });
if (!Users.isRemoteUser(user)) return;
if (!user.featured) return;
logger.info(`Updating the featured: ${user.uri}`);
const resolver = new Resolver();
if (resolver == null) resolver = new Resolver();
// Resolve to (Ordered)Collection Object
const collection = await resolver.resolveCollection(user.featured);

8
packages/backend/src/remote/activitypub/models/question.ts
View File

@ -1,9 +1,9 @@
import config from '@/config/index.js';
import { Notes, Polls } from '@/models/index.js';
import { IPoll } from '@/models/entities/poll.js';
import Resolver from '../resolver.js';
import { IObject, IQuestion, isQuestion } from '../type.js';
import { apLogger } from '../logger.js';
import { Notes, Polls } from '@/models/index.js';
import { IPoll } from '@/models/entities/poll.js';
export async function extractPollFromQuestion(source: string | IObject, resolver?: Resolver): Promise<IPoll> {
if (resolver == null) resolver = new Resolver();
@ -40,7 +40,7 @@ export async function extractPollFromQuestion(source: string | IObject, resolver
* @param uri URI of AP Question object
* @returns true if updated
*/
export async function updateQuestion(value: any) {
export async function updateQuestion(value: any, resolver?: Resolver) {
const uri = typeof value === 'string' ? value : value.id;
// URIがこのサーバーを指しているならスキップ
@ -55,7 +55,7 @@ export async function updateQuestion(value: any) {
//#endregion
// resolve new Question object
const resolver = new Resolver();
if (resolver == null) resolver = new Resolver();
const question = await resolver.resolve(value) as IQuestion;
apLogger.debug(`fetched question: ${JSON.stringify(question, null, 2)}`);

15
packages/backend/src/remote/activitypub/resolver.ts
View File

@ -4,10 +4,7 @@ import { ILocalUser } from '@/models/entities/user.js';
import { getInstanceActor } from '@/services/instance-actor.js';
import { fetchMeta } from '@/misc/fetch-meta.js';
import { extractDbHost, isSelfHost } from '@/misc/convert-host.js';
import { signedGet } from './request.js';
import { IObject, isCollectionOrOrderedCollection, ICollection, IOrderedCollection } from './type.js';
import { FollowRequests, Notes, NoteReactions, Polls, Users } from '@/models/index.js';
import { parseUri } from './db-resolver.js';
import renderNote from '@/remote/activitypub/renderer/note.js';
import { renderLike } from '@/remote/activitypub/renderer/like.js';
import { renderPerson } from '@/remote/activitypub/renderer/person.js';
@ -15,12 +12,16 @@ import renderQuestion from '@/remote/activitypub/renderer/question.js';
import renderCreate from '@/remote/activitypub/renderer/create.js';
import { renderActivity } from '@/remote/activitypub/renderer/index.js';
import renderFollow from '@/remote/activitypub/renderer/follow.js';
import { parseUri } from './db-resolver.js';
import { IObject, isCollectionOrOrderedCollection, ICollection, IOrderedCollection } from './type.js';
import { signedGet } from './request.js';
export default class Resolver {
private history: Set<string>;
private user?: ILocalUser;
private recursionLimit?: number;
constructor() {
constructor(recursionLimit = 100) {
this.history = new Set();
}
@ -60,6 +61,10 @@ export default class Resolver {
throw new Error('cannot resolve already resolved one');
}
if (this.recursionLimit && this.history.size > this.recursionLimit) {
throw new Error('hit recursion limit');
}
this.history.add(value);
const host = extractDbHost(value);
@ -123,7 +128,7 @@ export default class Resolver {
if (parsed.rest == null || !/^\w+$/.test(parsed.rest)) throw new Error('resolveLocal: invalid follow URI');
return Promise.all(
[parsed.id, parsed.rest].map(id => Users.findOneByOrFail({ id }))
[parsed.id, parsed.rest].map(id => Users.findOneByOrFail({ id })),
)
.then(([follower, followee]) => renderActivity(renderFollow(follower, followee, url)));
default: