X-Git-Url: https://git.immae.eu/?a=blobdiff_plain;f=server%2Fmiddlewares%2Factivitypub.ts;h=261b9f690981370a38affc1eb580c6d00acaca8e;hb=3a380e9a71037b0fcbace58a7599221e7cc76e20;hp=489396447cbaa9a52fabdb8198291a35437b9d1c;hpb=3fd3ab2d34d512b160a5e6084d7609be7b4f4452;p=github%2FChocobozzz%2FPeerTube.git

diff --git a/server/middlewares/activitypub.ts b/server/middlewares/activitypub.ts
index 489396447..261b9f690 100644
--- a/server/middlewares/activitypub.ts
+++ b/server/middlewares/activitypub.ts
@@ -1,62 +1,156 @@
-import { eachSeries } from 'async'
-import { NextFunction, Request, RequestHandler, Response } from 'express'
-import { ActivityPubSignature } from '../../shared'
-import { isSignatureVerified, logger } from '../helpers'
-import { ACCEPT_HEADERS, ACTIVITY_PUB } from '../initializers'
-import { fetchRemoteAccount, saveAccountAndServerIfNotExist } from '../lib/activitypub'
-import { AccountModel } from '../models/account/account'
+import { NextFunction, Request, Response } from 'express'
+import { isActorDeleteActivityValid } from '@server/helpers/custom-validators/activitypub/actor'
+import { getAPId } from '@server/lib/activitypub/activity'
+import { wrapWithSpanAndContext } from '@server/lib/opentelemetry/tracing'
+import { ActivityDelete, ActivityPubSignature, HttpStatusCode } from '@shared/models'
+import { logger } from '../helpers/logger'
+import { isHTTPSignatureVerified, isJsonLDSignatureVerified, parseHTTPSignature } from '../helpers/peertube-crypto'
+import { ACCEPT_HEADERS, ACTIVITY_PUB, HTTP_SIGNATURE } from '../initializers/constants'
+import { getOrCreateAPActor, loadActorUrlOrGetFromWebfinger } from '../lib/activitypub/actors'
 
 async function checkSignature (req: Request, res: Response, next: NextFunction) {
-  const signatureObject: ActivityPubSignature = req.body.signature
+  try {
+    const httpSignatureChecked = await checkHttpSignature(req, res)
+    if (httpSignatureChecked !== true) return
 
-  logger.debug('Checking signature of account %s...', signatureObject.creator)
+    const actor = res.locals.signature.actor
 
-  let account = await AccountModel.loadByUrl(signatureObject.creator)
-
-  // We don't have this account in our database, fetch it on remote
-  if (!account) {
-    account = await fetchRemoteAccount(signatureObject.creator)
+    // Forwarded activity
+    const bodyActor = req.body.actor
+    const bodyActorId = getAPId(bodyActor)
+    if (bodyActorId && bodyActorId !== actor.url) {
+      const jsonLDSignatureChecked = await checkJsonLDSignature(req, res)
+      if (jsonLDSignatureChecked !== true) return
+    }
 
-    if (!account) {
-      return res.sendStatus(403)
+    return next()
+  } catch (err) {
+    const activity: ActivityDelete = req.body
+    if (isActorDeleteActivityValid(activity) && activity.object === activity.actor) {
+      logger.debug('Handling signature error on actor delete activity', { err })
+      return res.status(HttpStatusCode.NO_CONTENT_204).end()
     }
 
-    // Save our new account and its server in database
-    await saveAccountAndServerIfNotExist(account)
+    logger.warn('Error in ActivityPub signature checker.', { err })
+    return res.fail({
+      status: HttpStatusCode.FORBIDDEN_403,
+      message: 'ActivityPub signature could not be checked'
+    })
   }
+}
 
-  const verified = await isSignatureVerified(account, req.body)
-  if (verified === false) return res.sendStatus(403)
-
-  res.locals.signature = {
-    account
+function executeIfActivityPub (req: Request, res: Response, next: NextFunction) {
+  const accepted = req.accepts(ACCEPT_HEADERS)
+  if (accepted === false || ACTIVITY_PUB.POTENTIAL_ACCEPT_HEADERS.includes(accepted) === false) {
+    // Bypass this route
+    return next('route')
   }
 
+  logger.debug('ActivityPub request for %s.', req.url)
+
   return next()
 }
 
-function executeIfActivityPub (fun: RequestHandler | RequestHandler[]) {
-  return (req: Request, res: Response, next: NextFunction) => {
-    const accepted = req.accepts(ACCEPT_HEADERS)
-    if (accepted === false || ACTIVITY_PUB.POTENTIAL_ACCEPT_HEADERS.indexOf(accepted) === -1) {
-      return next()
+// ---------------------------------------------------------------------------
+
+export {
+  checkSignature,
+  executeIfActivityPub,
+  checkHttpSignature
+}
+
+// ---------------------------------------------------------------------------
+
+async function checkHttpSignature (req: Request, res: Response) {
+  return wrapWithSpanAndContext('peertube.activitypub.checkHTTPSignature', async () => {
+    // FIXME: compatibility with http-signature < v1.3
+    const sig = req.headers[HTTP_SIGNATURE.HEADER_NAME] as string
+    if (sig && sig.startsWith('Signature ') === true) req.headers[HTTP_SIGNATURE.HEADER_NAME] = sig.replace(/^Signature /, '')
+
+    let parsed: any
+
+    try {
+      parsed = parseHTTPSignature(req, HTTP_SIGNATURE.CLOCK_SKEW_SECONDS)
+    } catch (err) {
+      logger.warn('Invalid signature because of exception in signature parser', { reqBody: req.body, err })
+
+      res.fail({
+        status: HttpStatusCode.FORBIDDEN_403,
+        message: err.message
+      })
+      return false
+    }
+
+    const keyId = parsed.keyId
+    if (!keyId) {
+      res.fail({
+        status: HttpStatusCode.FORBIDDEN_403,
+        message: 'Invalid key ID',
+        data: {
+          keyId
+        }
+      })
+      return false
     }
 
-    logger.debug('ActivityPub request for %s.', req.url)
+    logger.debug('Checking HTTP signature of actor %s...', keyId)
 
-    if (Array.isArray(fun) === true) {
-      return eachSeries(fun as RequestHandler[], (f, cb) => {
-        f(req, res, cb)
-      }, next)
+    let [ actorUrl ] = keyId.split('#')
+    if (actorUrl.startsWith('acct:')) {
+      actorUrl = await loadActorUrlOrGetFromWebfinger(actorUrl.replace(/^acct:/, ''))
     }
 
-    return (fun as RequestHandler)(req, res, next)
-  }
+    const actor = await getOrCreateAPActor(actorUrl)
+
+    const verified = isHTTPSignatureVerified(parsed, actor)
+    if (verified !== true) {
+      logger.warn('Signature from %s is invalid', actorUrl, { parsed })
+
+      res.fail({
+        status: HttpStatusCode.FORBIDDEN_403,
+        message: 'Invalid signature',
+        data: {
+          actorUrl
+        }
+      })
+      return false
+    }
+
+    res.locals.signature = { actor }
+    return true
+  })
 }
 
-// ---------------------------------------------------------------------------
+async function checkJsonLDSignature (req: Request, res: Response) {
+  return wrapWithSpanAndContext('peertube.activitypub.JSONLDSignature', async () => {
+    const signatureObject: ActivityPubSignature = req.body.signature
 
-export {
-  checkSignature,
-  executeIfActivityPub
+    if (!signatureObject?.creator) {
+      res.fail({
+        status: HttpStatusCode.FORBIDDEN_403,
+        message: 'Object and creator signature do not match'
+      })
+      return false
+    }
+
+    const [ creator ] = signatureObject.creator.split('#')
+
+    logger.debug('Checking JsonLD signature of actor %s...', creator)
+
+    const actor = await getOrCreateAPActor(creator)
+    const verified = await isJsonLDSignatureVerified(actor, req.body)
+
+    if (verified !== true) {
+      logger.warn('Signature not verified.', req.body)
+
+      res.fail({
+        status: HttpStatusCode.FORBIDDEN_403,
+        message: 'Signature could not be verified'
+      })
+      return false
+    }
+
+    res.locals.signature = { actor }
+    return true
+  })
 }