fix(server): "forkbomb" DOS mitigation (#9247)

* Add recursion limit to resolver

* Use shared resolver in featured and question

* Changelog

* Changelog fix

* Update CHANGELOG.md

Co-authored-by: Acid Chicken (硫酸鶏) <root@acid-chicken.com>

* Add host to recursion limit error message

Co-authored-by: Acid Chicken (硫酸鶏) <root@acid-chicken.com>

Co-authored-by: syuilo <Syuilotan@yahoo.co.jp>
Co-authored-by: Acid Chicken (硫酸鶏) <root@acid-chicken.com>
This commit is contained in:
Derek 2022-12-02 16:13:36 -05:00 committed by GitHub
parent 5decad9cf1
commit 66513b9893
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5 changed files with 14 additions and 8 deletions

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@ -25,6 +25,7 @@ You should also include the user name that made the change.
- Server: 引用内の文章がnyaizeされてしまう問題を修正 @kabo2468
- Server: Bug fix for Pinned Users lookup on instance @squidicuzz
- Client: インスタンスティッカーのfaviconを読み込む際に偽サイト警告が出ることがあるのを修正 @syuilo
- Server: Mitigate AP reference chain DoS vector @skehmatics
## 12.119.0 (2022/09/10)

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@ -731,7 +731,7 @@ export class ApInboxService {
await this.apPersonService.updatePerson(actor.uri!, resolver, object);
return 'ok: Person updated';
} else if (getApType(object) === 'Question') {
await this.apQuestionService.updateQuestion(object).catch(err => console.error(err));
await this.apQuestionService.updateQuestion(object, resolver).catch(err => console.error(err));
return 'ok: Question updated';
} else {
return `skip: Unknown type: ${getApType(object)}`;

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@ -76,6 +76,7 @@ export class Resolver {
private httpRequestService: HttpRequestService,
private apRendererService: ApRendererService,
private apDbResolverService: ApDbResolverService,
private recursionLimit = 100
) {
this.history = new Set();
}
@ -116,6 +117,10 @@ export class Resolver {
throw new Error('cannot resolve already resolved one');
}
if (this.history.size > this.recursionLimit) {
throw new Error(`hit recursion limit: ${this.utilityService.extractDbHost(value)}`);
}
this.history.add(value);
const host = this.utilityService.extractDbHost(value);

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@ -390,7 +390,7 @@ export class ApPersonService implements OnModuleInit {
});
//#endregion
await this.updateFeatured(user!.id).catch(err => this.logger.error(err));
await this.updateFeatured(user!.id, resolver).catch(err => this.logger.error(err));
return user!;
}
@ -503,7 +503,7 @@ export class ApPersonService implements OnModuleInit {
followerSharedInbox: person.sharedInbox ?? (person.endpoints ? person.endpoints.sharedInbox : undefined),
});
await this.updateFeatured(exist.id).catch(err => this.logger.error(err));
await this.updateFeatured(exist.id, resolver).catch(err => this.logger.error(err));
}
/**
@ -551,14 +551,14 @@ export class ApPersonService implements OnModuleInit {
return { fields, services };
}
public async updateFeatured(userId: User['id']) {
public async updateFeatured(userId: User['id'], resolver?: Resolver) {
const user = await this.usersRepository.findOneByOrFail({ id: userId });
if (!this.userEntityService.isRemoteUser(user)) return;
if (!user.featured) return;
this.logger.info(`Updating the featured: ${user.uri}`);
const resolver = this.apResolverService.createResolver();
if (resolver == null) resolver = this.apResolverService.createResolver();
// Resolve to (Ordered)Collection Object
const collection = await resolver.resolveCollection(user.featured);

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@ -65,7 +65,7 @@ export class ApQuestionService {
* @param uri URI of AP Question object
* @returns true if updated
*/
public async updateQuestion(value: any) {
public async 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
@ -80,7 +80,7 @@ export class ApQuestionService {
//#endregion
// resolve new Question object
const resolver = this.apResolverService.createResolver();
if (resolver == null) resolver = this.apResolverService.createResolver();
const question = await resolver.resolve(value) as IQuestion;
this.logger.debug(`fetched question: ${JSON.stringify(question, null, 2)}`);