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crowdsec: whitelist first-party client false positives (Matrix media/rooms, DAV auth)

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aykhans
2026-08-05 08:10:02 +00:00
parent e577bf7304
commit 175e3b4416
3 changed files with 13 additions and 3 deletions
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crowdsec/docker-compose.yaml
+1
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@@ -42,6 +42,7 @@ services:
- ./parsers/s01-parse/stalwart-logs-extended.yaml:/etc/crowdsec/parsers/s01-parse/stalwart-logs-extended.yaml:ro
- ./parsers/s02-enrich/whitelist-trusted.yaml:/etc/crowdsec/parsers/s02-enrich/whitelist-trusted.yaml:ro
- ./parsers/s02-enrich/whitelist-matrix-client-probes.yaml:/etc/crowdsec/parsers/s02-enrich/whitelist-matrix-client-probes.yaml:ro
- ./parsers/s02-enrich/whitelist-dav-auth-challenge.yaml:/etc/crowdsec/parsers/s02-enrich/whitelist-dav-auth-challenge.yaml:ro
- ./scenarios/stalwart-smtp-bruteforce.yaml:/etc/crowdsec/scenarios/stalwart-smtp-bruteforce.yaml:ro
- ./scenarios/stalwart-auth-bruteforce.yaml:/etc/crowdsec/scenarios/stalwart-auth-bruteforce.yaml:ro
- ./scenarios/http-admin-interface-probing.yaml:/etc/crowdsec/scenarios/http-admin-interface-probing.yaml:ro
crowdsec/parsers/s02-enrich/whitelist-dav-auth-challenge.yaml
+6
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@@ -0,0 +1,6 @@
name: aykhans/whitelist-dav-auth-challenge
description: "Prevent http-generic-bf false positives from DAV clients' auth-challenge 401s"
whitelist:
reason: "CalDAV/CardDAV/WebDAV clients (Thunderbird etc.) send an unauthenticated PROPFIND and get 401 by design; real DAV auth brute-force is still covered by the Stalwart auth-bruteforce scenario reading Stalwart's own logs"
expression:
- evt.Meta.service == 'http' and evt.Meta.http_status == '401' and evt.Meta.http_path startsWith '/dav/'
crowdsec/parsers/s02-enrich/whitelist-matrix-client-probes.yaml
+6 -3
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@@ -1,8 +1,11 @@
name: aykhans/whitelist-matrix-client-probes
description: "Prevent http-probing false positives from Matrix client feature-detection 404s"
description: "Prevent http-probing / http-crawl false positives from normal Matrix client traffic"
whitelist:
reason: "Matrix client MSC feature-detection and media preview requests return 404 by design (benign)"
reason: "Matrix client feature-detection, media loading and room lookups are benign client behavior"
expression:
# Feature-detection endpoints (unstable MSCs) return 404 by design
- evt.Meta.service == 'http' and evt.Meta.http_status == '404' and evt.Meta.http_path startsWith '/_matrix/client/unstable/org.matrix.msc'
- evt.Meta.service == 'http' and evt.Meta.http_status == '404' and evt.Meta.http_path startsWith '/_matrix/client/v1/media/preview_url'
# Room event/relations/state lookups that 404 (event not found / federated backfill)
- evt.Meta.service == 'http' and evt.Meta.http_status == '404' and evt.Meta.http_path startsWith '/_matrix/client/' and evt.Meta.http_path contains '/rooms/'
# Media thumbnails/downloads/preview: high-cardinality GET bursts (any status) trip http-crawl
- evt.Meta.service == 'http' and evt.Meta.http_path startsWith '/_matrix/client/' and evt.Meta.http_path contains '/media/'