fix(crowdsec): update parser 'crowdsecurity/nextcloud-whitelist'

update note:
- deprecate custom whitelist expression
- apply 'crowdsecurity/nextcloud-whitelist' parser

ansible/roles/common/tasks/services/set_crowdsec.yaml

@@ -36,10 +36,15 @@
   ansible.builtin.set_fact:
     acquisd_list:
       fw:
-        collection: "crowdsecurity/suricata"
+        collection:
+          - "crowdsecurity/suricata"
+        parser: []
         config: "suricata.yaml"
       auth:
-        collection: "crowdsecurity/caddy"
+        collection:
+          - "crowdsecurity/caddy"
+        parser:
+          - "crowdsecurity/nextcloud-whitelist"
         config: "caddy.yaml"
 
 - name: Deploy crowdsec-update service files
@@ -181,7 +186,8 @@
   block:
     - name: Install crowdsec collection
       ansible.builtin.command:
-        cmd: "cscli collections install {{ acquisd_list[node['name']]['collection'] }}"
+        cmd: "cscli collections install {{ item }}"
+      loop: "{{ acquisd_list[node['name']]['collection'] }}"
       become: true
       changed_when: "'overwrite' not in is_collection_installed.stderr"
       failed_when:
@@ -189,6 +195,17 @@
         - "'already installed' not in is_collection_installed.stderr"
       register: "is_collection_installed"
 
+    - name: Install crowdsec parser
+      ansible.builtin.command:
+        cmd: "cscli parsers install {{ item }}"
+      loop: "{{ acquisd_list[node['name']]['parser'] }}"
+      become: true
+      changed_when: "'overwrite' not in is_parser_installed.stderr"
+      failed_when:
+        - is_parser_installed.rc != 0
+        - "'already installed' not in is_parser_installed.stderr"
+      register: "is_parser_installed"
+
     - name: Create crowdsec acquis.d directory
       ansible.builtin.file:
         path: "/etc/crowdsec/acquis.d"

config/services/systemd/common/crowdsec/bouncers/whitelists.yaml.j2

@@ -18,9 +18,4 @@ 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 (crowdsecurity/http-crawl-non_statics)
-        - "evt.Meta.target_fqdn == '{{ services['nextcloud']['domain']['public'] }}.{{ domain['public'] }}' && evt.Meta.http_path contains '/apps/viewer/js/'"
-        - "evt.Meta.target_fqdn == '{{ services['nextcloud']['domain']['public'] }}.{{ domain['public'] }}' && evt.Meta.http_path contains '/dist/'"
-        # nextcloud upload directory request 404 error false positive (crowdsecurity/http-probing)
-        - "evt.Meta.target_fqdn == '{{ services['nextcloud']['domain']['public'] }}.{{ domain['public'] }}' && evt.Meta.http_path contains '/remote.php/dav/files/'"
 {% endif %}

docs/issues/crowdsec/260502_nextcloud.md

@@ -14,18 +14,18 @@
   - fw ban users' IP address.
 
 ## Reason
-- Nextcloud uses chunks for actions, and uploading and downloading
+- Nextcloud has a lot of workflows which can be caught from crowdsec
-    - chunks on '/apps/viewer/js', '/dist/'
-    - `crowdsecurity/http-crawl-non_statics`
-- Nextcloud keeps checking directory which is uploading
-    - upload directory '/remote.php/dav/files/'
-    - `crowdsecurity/http-probing`
 
 ## Timeline
 - 2026-05-02: Release nextcloud
 - 2026-05-02: Find the false positive case, and add whitelist
+- 2026-05-03: Install crowdsecurity/nextcloud-whitelist parser
+- 2026-05-03: Make previous expressions annotation
 
 ## Solution
+- Install crowdsecurity/nextcloud-whitelist on auth node
+
+### Deprecated solution
 - Access to fw
   - Check the ban list with `sudo cscli alerts list`
   - Read the ban case with `sudo cscli alerts inspect $NUMBER`