From 0229406ad6632f479341cf4a9480746f21f9b95a Mon Sep 17 00:00:00 2001
From: il <il@ilnmors.internal>
Date: Sat, 2 May 2026 19:49:24 +0900
Subject: [PATCH] fix(crowdsec): update whitelist.yaml to prevent false
 positive from nextcloud chunk

---
 .../crowdsec/bouncers/whitelists.yaml.j2      |  2 ++
 docs/issues/crowdsec/260502_nextcloud.md      | 33 +++++++++++++++++++
 2 files changed, 35 insertions(+)
 create mode 100644 docs/issues/crowdsec/260502_nextcloud.md

diff --git a/config/services/systemd/common/crowdsec/bouncers/whitelists.yaml.j2 b/config/services/systemd/common/crowdsec/bouncers/whitelists.yaml.j2
index fed75d1..8b78823 100644
--- a/config/services/systemd/common/crowdsec/bouncers/whitelists.yaml.j2
+++ b/config/services/systemd/common/crowdsec/bouncers/whitelists.yaml.j2
@@ -18,4 +18,6 @@ whitelist:
         - "evt.Meta.target_fqdn == '{{ services['immich']['domain']['public'] }}.{{ domain['public'] }}' && evt.Meta.http_path contains '/api/assets/' && evt.Meta.http_path contains '/thumbnail'"
         # opencloud chunk request false positive
         - "evt.Meta.target_fqdn == '{{ services['opencloud']['domain']['public'] }}.{{ domain['public'] }}' && evt.Meta.http_path contains '/js/chunks/'"
+        # nextcloud chunk request false positive
+        - evt.Meta.target_fqdn == '{{ services['opencloud']['domain']['public'] }}.{{ domain['public'] }}' && evt.Meta.http_path contains '/apps/viewer/js/'
 {% endif %}
diff --git a/docs/issues/crowdsec/260502_nextcloud.md b/docs/issues/crowdsec/260502_nextcloud.md
new file mode 100644
index 0000000..87e8357
--- /dev/null
+++ b/docs/issues/crowdsec/260502_nextcloud.md
@@ -0,0 +1,33 @@
+# Nextcloud crowdsec false positive issue
+
+## Status
+- Finished
+
+## Date
+- 2026-05-02
+
+## Version
+- Nextcloud: 33.0.3
+
+## Problem
+- When users download or modify some files, all connections to homelab services are refused.
+  - fw ban users' IP address.
+
+## Reason
+- Nextcloud uses chunks when clients uploads or download files to it.
+- LAPI decides a ban when a lot of chunks file is uploaded or downloaded from external devices.
+    - `crowdsecurity/http-crawl-non_statics`
+
+## Timeline
+- 2026-05-02: Release OpenCloud
+- 2026-05-02: Find the false positive case, and add whitelist
+
+## Solution
+- Access to fw
+  - Check the ban list with `sudo cscli alerts list`
+  - Read the ban case with `sudo cscli alerts inspect $NUMBER`
+- Add regex on whitelist
+  - evt.Meta.target_fcqdn == '{{ services['opencloud']['domain']['public'] }}.{{ domain['public'] }}' && evt.Meta.http_path contains '/apps/viewer/js/'
+- Delete false positive decision
+  - Check false positive decision with `sudo cscli decision list`
+  - Delete false positive decision with `sudo cscli decision delete --id $ID`