132 lines
4.3 KiB
TypeScript
132 lines
4.3 KiB
TypeScript
import { NextFunction, Request, Response } from 'express'
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import { ActivityDelete, ActivityPubSignature } from '../../shared'
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import { logger } from '../helpers/logger'
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import { isHTTPSignatureVerified, isJsonLDSignatureVerified, parseHTTPSignature } from '../helpers/peertube-crypto'
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import { ACCEPT_HEADERS, ACTIVITY_PUB, HTTP_SIGNATURE } from '../initializers/constants'
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import { getOrCreateActorAndServerAndModel } from '../lib/activitypub/actor'
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import { loadActorUrlOrGetFromWebfinger } from '../helpers/webfinger'
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import { isActorDeleteActivityValid } from '@server/helpers/custom-validators/activitypub/actor'
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import { getAPId } from '@server/helpers/activitypub'
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import { HttpStatusCode } from '../../shared/core-utils/miscs/http-error-codes'
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async function checkSignature (req: Request, res: Response, next: NextFunction) {
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try {
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const httpSignatureChecked = await checkHttpSignature(req, res)
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if (httpSignatureChecked !== true) return
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const actor = res.locals.signature.actor
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// Forwarded activity
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const bodyActor = req.body.actor
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const bodyActorId = getAPId(bodyActor)
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if (bodyActorId && bodyActorId !== actor.url) {
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const jsonLDSignatureChecked = await checkJsonLDSignature(req, res)
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if (jsonLDSignatureChecked !== true) return
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}
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return next()
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} catch (err) {
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const activity: ActivityDelete = req.body
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if (isActorDeleteActivityValid(activity) && activity.object === activity.actor) {
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logger.debug('Handling signature error on actor delete activity', { err })
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return res.sendStatus(HttpStatusCode.NO_CONTENT_204)
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}
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logger.warn('Error in ActivityPub signature checker.', { err })
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return res.sendStatus(HttpStatusCode.FORBIDDEN_403)
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}
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}
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function executeIfActivityPub (req: Request, res: Response, next: NextFunction) {
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const accepted = req.accepts(ACCEPT_HEADERS)
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if (accepted === false || ACTIVITY_PUB.POTENTIAL_ACCEPT_HEADERS.includes(accepted) === false) {
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// Bypass this route
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return next('route')
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}
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logger.debug('ActivityPub request for %s.', req.url)
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return next()
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}
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// ---------------------------------------------------------------------------
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export {
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checkSignature,
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executeIfActivityPub,
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checkHttpSignature
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}
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// ---------------------------------------------------------------------------
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async function checkHttpSignature (req: Request, res: Response) {
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// FIXME: compatibility with http-signature < v1.3
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const sig = req.headers[HTTP_SIGNATURE.HEADER_NAME] as string
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if (sig && sig.startsWith('Signature ') === true) req.headers[HTTP_SIGNATURE.HEADER_NAME] = sig.replace(/^Signature /, '')
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let parsed: any
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try {
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parsed = parseHTTPSignature(req, HTTP_SIGNATURE.CLOCK_SKEW_SECONDS)
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} catch (err) {
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logger.warn('Invalid signature because of exception in signature parser', { reqBody: req.body, err })
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res.status(HttpStatusCode.FORBIDDEN_403).json({ error: err.message })
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return false
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}
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const keyId = parsed.keyId
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if (!keyId) {
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res.sendStatus(HttpStatusCode.FORBIDDEN_403)
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return false
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}
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logger.debug('Checking HTTP signature of actor %s...', keyId)
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let [ actorUrl ] = keyId.split('#')
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if (actorUrl.startsWith('acct:')) {
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actorUrl = await loadActorUrlOrGetFromWebfinger(actorUrl.replace(/^acct:/, ''))
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}
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const actor = await getOrCreateActorAndServerAndModel(actorUrl)
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const verified = isHTTPSignatureVerified(parsed, actor)
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if (verified !== true) {
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logger.warn('Signature from %s is invalid', actorUrl, { parsed })
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res.sendStatus(HttpStatusCode.FORBIDDEN_403)
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return false
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}
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res.locals.signature = { actor }
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return true
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}
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async function checkJsonLDSignature (req: Request, res: Response) {
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const signatureObject: ActivityPubSignature = req.body.signature
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if (!signatureObject || !signatureObject.creator) {
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res.sendStatus(HttpStatusCode.FORBIDDEN_403)
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return false
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}
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const [ creator ] = signatureObject.creator.split('#')
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logger.debug('Checking JsonLD signature of actor %s...', creator)
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const actor = await getOrCreateActorAndServerAndModel(creator)
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const verified = await isJsonLDSignatureVerified(actor, req.body)
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if (verified !== true) {
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logger.warn('Signature not verified.', req.body)
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res.sendStatus(HttpStatusCode.FORBIDDEN_403)
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return false
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}
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res.locals.signature = { actor }
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return true
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}
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