1 import { NextFunction, Request, Response } from 'express'
2 import { ActivityDelete, ActivityPubSignature } from '../../shared'
3 import { logger } from '../helpers/logger'
4 import { isHTTPSignatureVerified, isJsonLDSignatureVerified, parseHTTPSignature } from '../helpers/peertube-crypto'
5 import { ACCEPT_HEADERS, ACTIVITY_PUB, HTTP_SIGNATURE } from '../initializers/constants'
6 import { getOrCreateActorAndServerAndModel } from '../lib/activitypub/actor'
7 import { loadActorUrlOrGetFromWebfinger } from '../helpers/webfinger'
8 import { isActorDeleteActivityValid } from '@server/helpers/custom-validators/activitypub/actor'
9 import { getAPId } from '@server/helpers/activitypub'
10 import { HttpStatusCode } from '../../shared/core-utils/miscs/http-error-codes'
12 async function checkSignature (req: Request, res: Response, next: NextFunction) {
14 const httpSignatureChecked = await checkHttpSignature(req, res)
15 if (httpSignatureChecked !== true) return
17 const actor = res.locals.signature.actor
20 const bodyActor = req.body.actor
21 const bodyActorId = getAPId(bodyActor)
22 if (bodyActorId && bodyActorId !== actor.url) {
23 const jsonLDSignatureChecked = await checkJsonLDSignature(req, res)
24 if (jsonLDSignatureChecked !== true) return
29 const activity: ActivityDelete = req.body
30 if (isActorDeleteActivityValid(activity) && activity.object === activity.actor) {
31 logger.debug('Handling signature error on actor delete activity', { err })
32 return res.sendStatus(HttpStatusCode.NO_CONTENT_204)
35 logger.warn('Error in ActivityPub signature checker.', { err })
36 return res.sendStatus(HttpStatusCode.FORBIDDEN_403)
40 function executeIfActivityPub (req: Request, res: Response, next: NextFunction) {
41 const accepted = req.accepts(ACCEPT_HEADERS)
42 if (accepted === false || ACTIVITY_PUB.POTENTIAL_ACCEPT_HEADERS.includes(accepted) === false) {
47 logger.debug('ActivityPub request for %s.', req.url)
52 // ---------------------------------------------------------------------------
60 // ---------------------------------------------------------------------------
62 async function checkHttpSignature (req: Request, res: Response) {
63 // FIXME: compatibility with http-signature < v1.3
64 const sig = req.headers[HTTP_SIGNATURE.HEADER_NAME] as string
65 if (sig && sig.startsWith('Signature ') === true) req.headers[HTTP_SIGNATURE.HEADER_NAME] = sig.replace(/^Signature /, '')
70 parsed = parseHTTPSignature(req, HTTP_SIGNATURE.CLOCK_SKEW_SECONDS)
72 logger.warn('Invalid signature because of exception in signature parser', { reqBody: req.body, err })
74 res.status(HttpStatusCode.FORBIDDEN_403).json({ error: err.message })
78 const keyId = parsed.keyId
80 res.sendStatus(HttpStatusCode.FORBIDDEN_403)
84 logger.debug('Checking HTTP signature of actor %s...', keyId)
86 let [ actorUrl ] = keyId.split('#')
87 if (actorUrl.startsWith('acct:')) {
88 actorUrl = await loadActorUrlOrGetFromWebfinger(actorUrl.replace(/^acct:/, ''))
91 const actor = await getOrCreateActorAndServerAndModel(actorUrl)
93 const verified = isHTTPSignatureVerified(parsed, actor)
94 if (verified !== true) {
95 logger.warn('Signature from %s is invalid', actorUrl, { parsed })
97 res.sendStatus(HttpStatusCode.FORBIDDEN_403)
101 res.locals.signature = { actor }
106 async function checkJsonLDSignature (req: Request, res: Response) {
107 const signatureObject: ActivityPubSignature = req.body.signature
109 if (!signatureObject || !signatureObject.creator) {
110 res.sendStatus(HttpStatusCode.FORBIDDEN_403)
114 const [ creator ] = signatureObject.creator.split('#')
116 logger.debug('Checking JsonLD signature of actor %s...', creator)
118 const actor = await getOrCreateActorAndServerAndModel(creator)
119 const verified = await isJsonLDSignatureVerified(actor, req.body)
121 if (verified !== true) {
122 logger.warn('Signature not verified.', req.body)
124 res.sendStatus(HttpStatusCode.FORBIDDEN_403)
128 res.locals.signature = { actor }