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authorized fetch: log when things go wrong

This commit is contained in:
dakkar 2023-12-23 15:26:21 +00:00
parent 1984416e3e
commit 477cda0b63
1 changed files with 21 additions and 2 deletions
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23
packages/backend/src/server/ActivityPubServerService.ts
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@ -36,12 +36,17 @@ import { IActivity } from '@/core/activitypub/type.js';
import { isPureRenote } from '@/misc/is-pure-renote.js';
import type { FastifyInstance, FastifyRequest, FastifyReply, FastifyPluginOptions, FastifyBodyParser } from 'fastify';
import type { FindOptionsWhere } from 'typeorm';
import type Logger from '@/logger.js';
import { LoggerService } from '@/core/LoggerService.js';
const ACTIVITY_JSON = 'application/activity+json; charset=utf-8';
const LD_JSON = 'application/ld+json; profile="https://www.w3.org/ns/activitystreams"; charset=utf-8';
@Injectable()
export class ActivityPubServerService {
private logger: Logger;
private authlogger: Logger;
constructor(
@Inject(DI.config)
private config: Config,
@ -79,8 +84,11 @@ export class ActivityPubServerService {
private queueService: QueueService,
private userKeypairService: UserKeypairService,
private queryService: QueryService,
private loggerService: LoggerService,
) {
//this.createServer = this.createServer.bind(this);
this.logger = this.loggerService.getLogger('apserv', 'pink');
this.authlogger = this.logger.createSubLogger('sigcheck');
}
@bindThis
@ -130,8 +138,10 @@ export class ActivityPubServerService {
if (userId) {
const instanceActor = await this.instanceActorService.getInstanceActor();
if (userId === instanceActor.id) return false;
if (userId === instanceActor.username) return false;
if (userId === instanceActor.id || userId === instanceActor.username) {
this.authlogger.debug(`${request.id} ${request.url} request to instance.actor, letting through`);
return false;
}
}
let signature;
@ -140,6 +150,7 @@ export class ActivityPubServerService {
signature = httpSignature.parseRequest(request.raw, { 'headers': [] });
} catch (e) {
// not signed, or malformed signature: refuse
this.authlogger.warn(`${request.id} ${request.url} not signed, or malformed signature: refuse`);
reply.code(401);
return true;
}
@ -147,6 +158,7 @@ export class ActivityPubServerService {
if (signature.params.headers.indexOf('host') === -1
|| request.headers.host !== this.config.host) {
// no destination host, or not us: refuse
this.authlogger.warn(`${request.id} ${request.url} no destination host, or not us: refuse`);
reply.code(401);
return true;
}
@ -159,6 +171,7 @@ export class ActivityPubServerService {
/* blocked instance: refuse (we don't care if the signature is
good, if they even pretend to be from a blocked instance,
they're out) */
this.authlogger.warn(`${request.id} ${request.url} instance ${keyHost} is blocked: refuse`);
reply.code(401);
return true;
}
@ -173,11 +186,13 @@ export class ActivityPubServerService {
/* keyId is often in the shape `${user.uri}#${keyname}`, try
fetching information about the remote user */
const candidate = formatURL(keyId, { fragment: false });
this.authlogger.info(`${request.id} ${request.url} we don't know the user for keyId ${keyID}, trying to fetch via ${candidate}`);
authUser = await this.apDbResolverService.getAuthUserFromApId(candidate);
}
if (authUser?.key == null) {
// we can't figure out who the signer is, or we can't get their key: refuse
this.authlogger.warn(`${request.id} ${request.url} we can't figure out who the signer is, or we can't get their key: refuse`);
reply.code(401);
return true;
}
@ -185,16 +200,20 @@ export class ActivityPubServerService {
let httpSignatureValidated = httpSignature.verifySignature(signature, authUser.key.keyPem);
if (!httpSignatureValidated) {
this.authlogger.info(`${request.id} ${request.url} failed to validate signature, re-fetching the key for ${authUser.user}`);
// maybe they changed their key? refetch it
authUser.key = await this.apDbResolverService.refetchPublicKeyForApId(authUser.user);
if (authUser.key != null) {
httpSignatureValidated = httpSignature.verifySignature(signature, authUser.key.keyPem);
} else {
this.authlogger.warn(`${request.id} ${request.url} failed to re-fetch key for ${authUser.user}`);
}
}
if (!httpSignatureValidated) {
// bad signature: refuse
this.authlogger.info(`${request.id} ${request.url} failed to validate signature: refuse`);
reply.code(401);
return true;
}