From 8b6d3167bccd4c7baa40f74cccfbdc50a7bc8390 Mon Sep 17 00:00:00 2001 From: daikei Date: Sat, 11 Feb 2023 21:05:31 +0000 Subject: [PATCH] Discard notes made before Fedi's existence, or after today (#9605) This PR should kill #9531 - Safeguarding against posts that are made before 2007 (Identica being made in 2008, the 'first ever activitypub software' according to wikipedia.) Personally, if gone unnoticed, I believe that notes from the past can be used as an attack vector to silently flood a database. Co-authored-by: Kio-td Reviewed-on: https://codeberg.org/calckey/calckey/pulls/9605 Co-authored-by: daikei Co-committed-by: daikei --- .../src/remote/activitypub/models/note.ts | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/packages/backend/src/remote/activitypub/models/note.ts b/packages/backend/src/remote/activitypub/models/note.ts index 28ce46e300..e643e24c9f 100644 --- a/packages/backend/src/remote/activitypub/models/note.ts +++ b/packages/backend/src/remote/activitypub/models/note.ts @@ -125,6 +125,23 @@ export async function createNote( logger.info(`Creating the Note: ${note.id}`); + // Skip if note is made before 2007 (1yr before Fedi was created) + // OR skip if note is made 3 days in advance + if (note.published) { + const DateChecker = new Date(note.published) + const FutureCheck = new Date() + FutureCheck.setDate(FutureCheck.getDate() + 3) // Allow some wiggle room for misconfigured hosts + if (DateChecker.getFullYear() < 2007) { + logger.warn('Note somehow made before Activitypub was created; discarding'); + return null; + } + if (DateChecker > FutureCheck) { + logger.warn('Note somehow made after today; discarding') + return null; + } + } + + // Fetch author const actor = (await resolvePerson( getOneApId(note.attributedTo),