packages/backend/src/core/DownloadService.ts

@@ -61,7 +61,6 @@ export class DownloadService {
 				request: operationTimeout,	// whole operation timeout
 			},
 			agent: {
-				http: this.httpRequestService.httpAgent,
 				https: this.httpRequestService.httpsAgent,
 			},
 			http2: false,	// default

packages/backend/src/core/HttpRequestService.ts

@@ -107,7 +107,7 @@ export class HttpRequestService {
 		const finalUrl = res.url; // redirects may have been involved
 		const activity = await res.json() as IObject;
 
-		assertActivityMatchesUrls(activity, [url, finalUrl]);
+		assertActivityMatchesUrls(activity, [finalUrl]);
 
 		return activity;
 	}

packages/backend/src/core/activitypub/ApDbResolverService.ts

@@ -16,6 +16,7 @@ import { MiLocalUser, MiRemoteUser } from '@/models/User.js';
 import { getApId } from './type.js';
 import { ApPersonService } from './models/ApPersonService.js';
 import type { IObject } from './type.js';
+import { toASCII } from 'node:punycode';
 
 export type UriParseResult = {
 	/** wether the URI was generated by us */
@@ -63,7 +64,9 @@ export class ApDbResolverService implements OnApplicationShutdown {
 		const separator = '/';
 
 		const uri = new URL(getApId(value));
-		if (uri.origin !== this.config.url) return { local: false, uri: uri.href };
+		if (toASCII(uri.host) !== toASCII(this.config.host)) {
+			return { local: false, uri: uri.href };
+		}
 
 		const [, type, id, ...rest] = uri.pathname.split(separator);
 		return {

packages/backend/src/core/activitypub/ApInboxService.ts

@@ -487,7 +487,7 @@ export class ApInboxService {
 			const exist = await this.apNoteService.fetchNote(note);
 			if (exist) return 'skip: note exists';
 
-			await this.apNoteService.createNote(note, resolver, silent);
+			await this.apNoteService.createNote(note, actor, resolver, silent);
 			return 'ok';
 		} catch (err) {
 			if (err instanceof StatusError && !err.isRetryable) {

packages/backend/src/core/activitypub/ApRequestService.ts

@@ -11,11 +11,14 @@ import { DI } from '@/di-symbols.js';
 import type { Config } from '@/config.js';
 import type { MiUser } from '@/models/User.js';
 import { UserKeypairService } from '@/core/UserKeypairService.js';
+import { UtilityService } from '@/core/UtilityService.js';
 import { HttpRequestService } from '@/core/HttpRequestService.js';
 import { LoggerService } from '@/core/LoggerService.js';
 import { bindThis } from '@/decorators.js';
 import type Logger from '@/logger.js';
 import { validateContentTypeSetAsActivityPub } from '@/core/activitypub/misc/validator.js';
+import { assertActivityMatchesUrls } from '@/core/activitypub/misc/check-against-url.js';
+import type { IObject } from './type.js';
 
 type Request = {
 	url: string;
@@ -145,6 +148,7 @@ export class ApRequestService {
 		private userKeypairService: UserKeypairService,
 		private httpRequestService: HttpRequestService,
 		private loggerService: LoggerService,
+		private utilityService: UtilityService,
 	) {
 		// eslint-disable-next-line @typescript-eslint/no-unnecessary-condition
 		this.logger = this.loggerService?.getLogger('ap-request'); // なぜか TypeError: Cannot read properties of undefined (reading 'getLogger') と言われる
@@ -251,7 +255,11 @@ export class ApRequestService {
 		//#endregion
 
 		validateContentTypeSetAsActivityPub(res);
+		const finalUrl = res.url; // redirects may have been involved
+		const activity = await res.json() as IObject;
 
-		return await res.json();
+		assertActivityMatchesUrls(activity, [url, finalUrl]);
+
+		return activity;
 	}
 }

packages/backend/src/core/activitypub/ApResolverService.ts

@@ -21,6 +21,8 @@ import { ApDbResolverService } from './ApDbResolverService.js';
 import { ApRendererService } from './ApRendererService.js';
 import { ApRequestService } from './ApRequestService.js';
 import type { IObject, ICollection, IOrderedCollection, IUnsanitizedObject } from './type.js';
+import { toASCII } from 'node:punycode';
+import { yumeAssertAcceptableURL } from './misc/validator.js';
 
 export class Resolver {
 	private history: Set<string>;
@@ -53,6 +55,11 @@ export class Resolver {
 		return Array.from(this.history);
 	}
 
+	@bindThis
+	public getRecursionLimit(): number {
+		return this.recursionLimit;
+	}
+
 	@bindThis
 	public async resolveCollection(value: string | IObject): Promise<ICollection | IOrderedCollection> {
 		const collection = typeof value === 'string'
@@ -114,6 +121,21 @@ export class Resolver {
 			throw new Error('invalid response');
 		}
 
+		// HttpRequestService / ApRequestService have already checked that
+		// `object.id` or `object.url` matches the URL used to fetch the
+		// object after redirects; here we double-check that no redirects
+		// bounced between hosts
+		if (object.id == null) {
+			throw new Error('invalid AP object: missing id');
+		}
+
+		const idURL = yumeAssertAcceptableURL(object.id);
+		const valueURL = yumeAssertAcceptableURL(value);
+
+		if (toASCII(idURL.host) !== toASCII(valueURL.host)) {
+			throw new Bull.UnrecoverableError(`invalid AP object ${value}: id ${object.id} has different host`);
+		}
+
 		return object;
 	}
 

packages/backend/src/core/activitypub/misc/validator.ts

@@ -4,6 +4,28 @@
  */
 
 import type { Response } from 'node-fetch';
+import * as Bull from 'bullmq';
+import { toASCII } from 'node:punycode';
+
+export function yumeAssertAcceptableURL(url: string | URL): URL {
+	const urlParsed = url instanceof URL ? url : new URL(url);
+
+	if (urlParsed.search.length + urlParsed.pathname.length > 1024) {
+		throw new Bull.UnrecoverableError('URL is too long');
+	}
+
+	if (urlParsed.protocol !== 'https:') {
+		throw new Bull.UnrecoverableError('URL protocol is not https');
+	}
+
+	if (urlParsed.port && urlParsed.port !== '443') {
+		throw new Bull.UnrecoverableError('URL port is not 443');
+	}
+
+	urlParsed.hostname = toASCII(urlParsed.hostname);
+
+	return urlParsed;
+}
 
 export function validateContentTypeSetAsActivityPub(response: Response): void {
 	const contentType = (response.headers.get('content-type') ?? '').toLowerCase();

packages/backend/src/core/activitypub/models/ApNoteService.ts

@@ -36,6 +36,7 @@ import { ApQuestionService } from './ApQuestionService.js';
 import { ApImageService } from './ApImageService.js';
 import type { Resolver } from '../ApResolverService.js';
 import type { IObject, IPost } from '../type.js';
+import { yumeAssertAcceptableURL } from '../misc/validator.js';
 
 @Injectable()
 export class ApNoteService {
@@ -77,7 +78,7 @@ export class ApNoteService {
 	}
 
 	@bindThis
-	public validateNote(object: IObject, uri: string): Error | null {
+	public validateNote(object: IObject, uri: string, actor?: MiRemoteUser): Error | null {
 		const expectHost = this.utilityService.extractDbHost(uri);
 		const apType = getApType(object);
 
@@ -98,6 +99,14 @@ export class ApNoteService {
 			return new IdentifiableError('d450b8a9-48e4-4dab-ae36-f4db763fda7c', 'invalid Note: published timestamp is malformed');
 		}
 
+		if (actor) {
+			const attribution = (object.attributedTo) ? getOneApId(object.attributedTo) : actor.uri;
+
+			if (attribution !== actor.uri) {
+				return new IdentifiableError('d450b8a9-48e4-4dab-ae36-f4db763fda7c', `invalid Note: attribution does not match the actor that send it. attribution: ${attribution}, actor: ${actor.uri}`);
+			}
+		}
+
 		return null;
 	}
 
@@ -115,11 +124,14 @@ export class ApNoteService {
 	 * Noteを作成します。
 	 */
 	@bindThis
-	public async createNote(value: string | IObject, resolver: Resolver, silent = false): Promise<MiNote | null> {
+	public async createNote(value: string | IObject, actor?: MiRemoteUser, resolver?: Resolver, silent = false): Promise<MiNote | null> {
+		// eslint-disable-next-line no-param-reassign
+		if (resolver == null) resolver = this.apResolverService.createResolver();
+
 		const object = await resolver.resolve(value);
 
 		const entryUri = getApId(value);
-		const err = this.validateNote(object, entryUri);
+		const err = this.validateNote(object, entryUri, actor);
 		if (err) {
 			this.logger.error(err.message, {
 				resolver: { history: resolver.getHistory() },
@@ -133,14 +145,27 @@ export class ApNoteService {
 
 		this.logger.debug(`Note fetched: ${JSON.stringify(note, null, 2)}`);
 
-		if (note.id && !checkHttps(note.id)) {
+		if (note.id == null) {
+			throw new Error('Refusing to create note without id');
+		}
+
+		if (!checkHttps(note.id)) {
 			throw new Error('unexpected schema of note.id: ' + note.id);
 		}
 
 		const url = getOneApHrefNullable(note.url);
 
-		if (url && !checkHttps(url)) {
-			throw new Error('unexpected schema of note url: ' + url);
+		if (url != null) {
+			if (!checkHttps(url)) {
+				throw new Error('unexpected schema of note url: ' + url);
+			}
+
+			const actUrl = yumeAssertAcceptableURL(url);
+			const noteUrl = yumeAssertAcceptableURL(note.id);
+
+			if (noteUrl.host !== actUrl.host) {
+				throw new Error(`note url & uri host mismatch: note url: ${url}, note uri: ${note.id}`);
+			}
 		}
 
 		this.logger.info(`Creating the Note: ${note.id}`);
@@ -153,8 +178,9 @@ export class ApNoteService {
 		const uri = getOneApId(note.attributedTo);
 
 		// ローカルで投稿者を検索し、もし凍結されていたらスキップ
-		const cachedActor = await this.apPersonService.fetchPerson(uri) as MiRemoteUser;
-		if (cachedActor && cachedActor.isSuspended) {
+		// eslint-disable-next-line no-param-reassign
+		actor ??= await this.apPersonService.fetchPerson(uri) as MiRemoteUser | undefined;
+		if (actor && actor.isSuspended) {
 			throw new IdentifiableError('85ab9bd7-3a41-4530-959d-f07073900109', 'actor has been suspended');
 		}
 
@@ -186,7 +212,8 @@ export class ApNoteService {
 		}
 		//#endregion
 
-		const actor = cachedActor ?? await this.apPersonService.resolvePerson(uri, resolver) as MiRemoteUser;
+		// eslint-disable-next-line no-param-reassign
+		actor ??= await this.apPersonService.resolvePerson(uri, resolver) as MiRemoteUser;
 
 		// 解決した投稿者が凍結されていたらスキップ
 		if (actor.isSuspended) {
@@ -345,15 +372,11 @@ export class ApNoteService {
 			if (exist) return exist;
 			//#endregion
 
-			if (uri.startsWith(this.config.url)) {
-				throw new StatusError('cannot resolve local note', 400, 'cannot resolve local note');
-			}
-
 			// リモートサーバーからフェッチしてきて登録
 			// ここでuriの代わりに添付されてきたNote Objectが指定されていると、サーバーフェッチを経ずにノートが生成されるが
 			// 添付されてきたNote Objectは偽装されている可能性があるため、常にuriを指定してサーバーフェッチを行う。
 			const createFrom = options.sentFrom?.origin === new URL(uri).origin ? value : uri;
-			return await this.createNote(createFrom, this.apResolverService.createResolver(), true);
+			return await this.createNote(createFrom, undefined, options.resolver, true);
 		} finally {
 			unlock();
 		}

packages/backend/src/core/activitypub/models/ApPersonService.ts

@@ -661,7 +661,7 @@ export class ApPersonService implements OnModuleInit {
 
 	@bindThis
 	public async updateFeatured(userId: MiUser['id'], resolver?: Resolver): Promise<void> {
-		const user = await this.usersRepository.findOneByOrFail({ id: userId, isDeleted: false });
+		const user = await this.usersRepository.findOneByOrFail({ id: userId });
 		if (!this.userEntityService.isRemoteUser(user)) return;
 		if (!user.featured) return;
 

packages/backend/src/core/activitypub/models/ApQuestionService.ts

@@ -15,6 +15,8 @@ import { ApLoggerService } from '../ApLoggerService.js';
 import { ApResolverService } from '../ApResolverService.js';
 import type { Resolver } from '../ApResolverService.js';
 import type { IObject, IQuestion } from '../type.js';
+import { yumeAssertAcceptableURL } from '../misc/validator.js';
+import { toASCII } from 'punycode';
 
 @Injectable()
 export class ApQuestionService {
@@ -66,14 +68,16 @@ export class ApQuestionService {
 	 */
 	@bindThis
 	public async updateQuestion(value: string | IObject, resolver?: Resolver): Promise<boolean> {
-		const uri = typeof value === 'string' ? value : value.id;
-		if (uri == null) throw new Error('uri is null');
+		const uriIn = typeof value === 'string' ? value : value.id;
+		if (uriIn == null) throw new Error('uri is null');
 
 		// URIがこのサーバーを指しているならスキップ
-		if (uri.startsWith(this.config.url + '/')) throw new Error('uri points local');
+		const uri = yumeAssertAcceptableURL(uriIn);
+
+		if (toASCII(this.config.host) === uri.host) throw new Error('uri points local');
 
 		//#region このサーバーに既に登録されているか
-		const note = await this.notesRepository.findOneBy({ uri });
+		const note = await this.notesRepository.findOneBy({ uri: uriIn });
 		if (note == null) throw new Error('Question is not registered');
 
 		const poll = await this.pollsRepository.findOneBy({ noteId: note.id });

packages/backend/src/queue/processors/InboxProcessorService.ts

@@ -255,6 +255,8 @@ export class InboxProcessorService implements OnApplicationShutdown {
 				incCounter(mIncomingApReject, 'host_signature_mismatch');
 				throw new Bull.UnrecoverableError(`skip: signerHost(${signerHost}) !== activity.id host(${activityIdHost}`);
 			}
+		} else {
+			throw new Bull.UnrecoverableError('skip: activity id is not a string');
 		}
 
 		this.apRequestChart.inbox();

packages/backend/src/server/ActivityPubServerService.ts

@@ -105,7 +105,7 @@ export class ActivityPubServerService {
 		let signature;
 
 		try {
-			signature = httpSignature.parseRequest(request.raw, { 'headers': [] });
+			signature = httpSignature.parseRequest(request.raw, { 'headers': ['(request-target)', 'host', 'date'], authorizationHeaderName: 'signature' });
 		} catch (e) {
 			reply.code(401);
 			return;

packages/backend/src/server/api/endpoints/ap/get.ts

@@ -11,6 +11,7 @@ import { ApResolverService } from '@/core/activitypub/ApResolverService.js';
 export const meta = {
 	tags: ['federation'],
 
+	requireAdmin: true,
 	requireCredential: true,
 	kind: 'read:federation',
 

packages/backend/src/server/api/endpoints/ap/show.ts

@@ -118,6 +118,11 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 		]));
 		if (local != null) return local;
 
+		const host = this.utilityService.extractDbHost(uri);
+
+		// local object, not found in db? fail
+		if (this.utilityService.isSelfHost(host)) return null;
+
 		// リモートから一旦オブジェクトフェッチ
 		const resolver = this.apResolverService.createResolver();
 		const object = await resolver.resolve(uri) as any;
@@ -135,7 +140,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 		return await this.mergePack(
 			me,
 			isActor(object) ? await this.apPersonService.createPerson(getApId(object), resolver) : null,
-			isPost(object) ? await this.apNoteService.createNote(getApId(object), resolver, true) : null,
+			isPost(object) ? await this.apNoteService.createNote(getApId(object), undefined, resolver, true) : null,
 		);
 	}
 

packages/backend/src/server/web/UrlPreviewService.ts

@@ -118,7 +118,6 @@ export class UrlPreviewService {
 	private fetchSummary(url: string, meta: MiMeta, lang?: string): Promise<SummalyResult> {
 		const agent = this.config.proxy
 			? {
-				http: this.httpRequestService.httpAgent,
 				https: this.httpRequestService.httpsAgent,
 			}
 			: undefined;

packages/backend/test/unit/activitypub.ts

@@ -207,7 +207,7 @@ describe('ActivityPub', () => {
 			resolver.register(actor.id, actor);
 			resolver.register(post.id, post);
 
-			const note = await noteService.createNote(post.id, resolver, true);
+			const note = await noteService.createNote(post.id, undefined, resolver, true);
 
 			assert.deepStrictEqual(note?.uri, post.id);
 			assert.deepStrictEqual(note.visibility, 'public');
@@ -370,7 +370,7 @@ describe('ActivityPub', () => {
 			resolver.register(actor.featured, featured);
 			resolver.register(firstNote.id, firstNote);
 
-			const note = await noteService.createNote(firstNote.id as string, resolver);
+			const note = await noteService.createNote(firstNote.id as string, undefined, resolver);
 			assert.strictEqual(note?.uri, firstNote.id);
 		});
 	});