1 import { NextFunction, Request, Response } from 'express'
2 import { getAPId } from '@server/helpers/activitypub'
3 import { isActorDeleteActivityValid } from '@server/helpers/custom-validators/activitypub/actor'
4 import { ActivityDelete, ActivityPubSignature } from '../../shared'
5 import { HttpStatusCode } from '../../shared/core-utils/miscs/http-error-codes'
6 import { logger } from '../helpers/logger'
7 import { isHTTPSignatureVerified, isJsonLDSignatureVerified, parseHTTPSignature } from '../helpers/peertube-crypto'
8 import { ACCEPT_HEADERS, ACTIVITY_PUB, HTTP_SIGNATURE } from '../initializers/constants'
9 import { getOrCreateAPActor, loadActorUrlOrGetFromWebfinger } from '../lib/activitypub/actors'
11 async function checkSignature (req: Request, res: Response, next: NextFunction) {
13 const httpSignatureChecked = await checkHttpSignature(req, res)
14 if (httpSignatureChecked !== true) return
16 const actor = res.locals.signature.actor
19 const bodyActor = req.body.actor
20 const bodyActorId = getAPId(bodyActor)
21 if (bodyActorId && bodyActorId !== actor.url) {
22 const jsonLDSignatureChecked = await checkJsonLDSignature(req, res)
23 if (jsonLDSignatureChecked !== true) return
28 const activity: ActivityDelete = req.body
29 if (isActorDeleteActivityValid(activity) && activity.object === activity.actor) {
30 logger.debug('Handling signature error on actor delete activity', { err })
31 return res.status(HttpStatusCode.NO_CONTENT_204).end()
34 logger.warn('Error in ActivityPub signature checker.', { err })
36 status: HttpStatusCode.FORBIDDEN_403,
37 message: 'ActivityPub signature could not be checked'
42 function executeIfActivityPub (req: Request, res: Response, next: NextFunction) {
43 const accepted = req.accepts(ACCEPT_HEADERS)
44 if (accepted === false || ACTIVITY_PUB.POTENTIAL_ACCEPT_HEADERS.includes(accepted) === false) {
49 logger.debug('ActivityPub request for %s.', req.url)
54 // ---------------------------------------------------------------------------
62 // ---------------------------------------------------------------------------
64 async function checkHttpSignature (req: Request, res: Response) {
65 // FIXME: compatibility with http-signature < v1.3
66 const sig = req.headers[HTTP_SIGNATURE.HEADER_NAME] as string
67 if (sig && sig.startsWith('Signature ') === true) req.headers[HTTP_SIGNATURE.HEADER_NAME] = sig.replace(/^Signature /, '')
72 parsed = parseHTTPSignature(req, HTTP_SIGNATURE.CLOCK_SKEW_SECONDS)
74 logger.warn('Invalid signature because of exception in signature parser', { reqBody: req.body, err })
77 status: HttpStatusCode.FORBIDDEN_403,
83 const keyId = parsed.keyId
86 status: HttpStatusCode.FORBIDDEN_403,
87 message: 'Invalid key ID',
95 logger.debug('Checking HTTP signature of actor %s...', keyId)
97 let [ actorUrl ] = keyId.split('#')
98 if (actorUrl.startsWith('acct:')) {
99 actorUrl = await loadActorUrlOrGetFromWebfinger(actorUrl.replace(/^acct:/, ''))
102 const actor = await getOrCreateAPActor(actorUrl)
104 const verified = isHTTPSignatureVerified(parsed, actor)
105 if (verified !== true) {
106 logger.warn('Signature from %s is invalid', actorUrl, { parsed })
109 status: HttpStatusCode.FORBIDDEN_403,
110 message: 'Invalid signature',
118 res.locals.signature = { actor }
122 async function checkJsonLDSignature (req: Request, res: Response) {
123 const signatureObject: ActivityPubSignature = req.body.signature
125 if (!signatureObject || !signatureObject.creator) {
127 status: HttpStatusCode.FORBIDDEN_403,
128 message: 'Object and creator signature do not match'
133 const [ creator ] = signatureObject.creator.split('#')
135 logger.debug('Checking JsonLD signature of actor %s...', creator)
137 const actor = await getOrCreateAPActor(creator)
138 const verified = await isJsonLDSignatureVerified(actor, req.body)
140 if (verified !== true) {
141 logger.warn('Signature not verified.', req.body)
144 status: HttpStatusCode.FORBIDDEN_403,
145 message: 'Signature could not be verified'
150 res.locals.signature = { actor }