fix(crowdsec): optimize whitelist expressions

update notes:
- add http_status and http_verb for each expressions (actual budget, immich, opencloud)
- fix crowdsec and issues documents

config/node/fw/nftables.conf.j2

@@ -82,6 +82,8 @@ table inet filter {
         chain global {
                 # invalid packets
                 ct state invalid drop comment "deny invalid connection"
+                # VPN connection exception handling
+                udp dport $PORTS_VPN return comment "return vpn connection to input and forward chain"
                 # crowdsec
                 ip saddr @crowdsec-blacklists counter drop comment "deny all crowdsec blacklist"
                 ip6 saddr @crowdsec6-blacklists counter drop comment "deny all ipv6 crowdsec blacklist"

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

@@ -13,9 +13,11 @@ whitelist:
 {% if node['name'] == 'auth' %}
     expression:
         # budget local-first sql scrap rule
-        - "evt.Meta.target_fqdn == '{{ services['actualbudget']['domain']['public'] }}.{{ domain['public'] }}' && evt.Meta.http_path contains '/data/migrations/'"
+        - "evt.Meta.target_fqdn == '{{ services['actualbudget']['domain']['public'] }}.{{ domain['public'] }}' && evt.Meta.http_status in ['200', '304'] && evt.Meta.http_verb == 'GET' && evt.Meta.http_path contains '/data/migrations/'"
         # immich thumbnail request 404 error false positive
-        - "evt.Meta.target_fqdn == '{{ services['immich']['domain']['public'] }}.{{ domain['public'] }}' && evt.Meta.http_path contains '/api/assets/' && evt.Meta.http_path contains '/thumbnail'"
+        - "evt.Meta.target_fqdn == '{{ services['immich']['domain']['public'] }}.{{ domain['public'] }}' && evt.Meta.http_status == '404' && evt.Meta.http_verb == 'GET' && 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/'"
+        - "evt.Meta.target_fqdn == '{{ services['opencloud']['domain']['public'] }}.{{ domain['public'] }}' && evt.Meta.http_status in ['200', '304'] && evt.Meta.http_verb == 'GET' && evt.Meta.http_path contains '/js/chunks/'"
+        # nextcloud thumbnail/preview request error false positive
+        - "evt.Meta.target_fqdn == '{{ services['nextcloud']['domain']['public'] }}.{{ domain['public'] }}' && evt.Meta.http_status == '404' && evt.Meta.http_verb == 'GET' &&  evt.Meta.http_path startsWith '/index.php/core/preview?'"
 {% endif %}

docs/issues/crowdsec/260321_actual_budget.md

@@ -21,13 +21,14 @@
 ## Timeline
 - 2026-03-21: Release actual budget
 - 2026-03-21: Find the false positive case, and add whitelist
+- 2026-05-07: Optimize whitelist expression
 
 ## Solution
 - Access to fw
   - Check the ban list with `sudo cscli alerts list`
   - Read the ban case with `sudo cscli alerts inspect $NUMBER`
 - Add expressions on whitelist
-  - evt.Meta.target_fqdn == '{{ services['actualbudget']['domain']['public'] }}.{{ domain['public'] }}' && evt.Meta.http_path contains '/data/migrations/'
+  - evt.Meta.target_fqdn == '{{ services['actualbudget']['domain']['public'] }}.{{ domain['public'] }}' && evt.Meta.http_status in ['200', '304'] && evt.Meta.http_verb == 'GET' && evt.Meta.http_path contains '/data/migrations/'
 - Delete false positive decision
   - Check false positive decision with `sudo cscli decision list`
   - Delete false positive decision with `sudo cscli decision delete --id $ID`

docs/issues/crowdsec/260321_immich.md

@@ -20,13 +20,14 @@
 ## Timeline
 - 2026-03-21: Release Immich
 - 2026-03-21: Find the false positive case, and add whitelist
+- 2026-05-07: Optimize whitelist expression
 
 ## Solution
 - Access to fw
   - Check the ban list with `sudo cscli alerts list`
   - Read the ban case with `sudo cscli alerts inspect $NUMBER`
 - Add expressions on whitelist
-  - evt.Meta.target_fqdn == '{{ services['immich']['domain']['public'] }}.{{ domain['public'] }}' && evt.Meta.http_path contains '/api/assets/' && evt.Meta.http_path contains '/thumbnail'
+  - evt.Meta.target_fqdn == '{{ services['immich']['domain']['public'] }}.{{ domain['public'] }}' && evt.Meta.http_status == '404' && evt.Meta.http_verb == 'GET' && evt.Meta.http_path contains '/api/assets/' && evt.Meta.http_path contains '/thumbnail'
 - Delete false positive decision
   - Check false positive decision with `sudo cscli decision list`
   - Delete false positive decision with `sudo cscli decision delete --id $ID`

docs/issues/crowdsec/260404_opencloud.md

@@ -20,13 +20,14 @@
 ## Timeline
 - 2026-04-04: Release OpenCloud
 - 2026-04-04: Find the false positive case, and add whitelist
+- 2026-05-07: Optimize whitelist expression
 
 ## Solution
 - Access to fw
   - Check the ban list with `sudo cscli alerts list`
   - Read the ban case with `sudo cscli alerts inspect $NUMBER`
 - Add expressions on whitelist
-  - evt.Meta.target_fqdn == '{{ services['opencloud']['domain']['public'] }}.{{ domain['public'] }}' && evt.Meta.http_path contains '/js/chunks/'
+  - evt.Meta.target_fqdn == '{{ services['opencloud']['domain']['public'] }}.{{ domain['public'] }}' && evt.Meta.http_status in ['200', '304'] && evt.Meta.http_verb == 'GET' && evt.Meta.http_path contains '/js/chunks/'
 - Delete false positive decision
   - Check false positive decision with `sudo cscli decision list`
   - Delete false positive decision with `sudo cscli decision delete --id $ID`

docs/issues/crowdsec/260502_nextcloud.md

@@ -21,9 +21,13 @@
 - 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
+- 2026-05-07: Find the false positive case, which is not on `crowdsecurity/nextcloud-whitelist`
+- 2026-05-07: Set whitelist expression
 
 ## Solution
 - Install crowdsecurity/nextcloud-whitelist on auth node
+- Add expression on whitelist
+  - evt.Meta.target_fqdn == '{{ services['nextcloud']['domain']['public'] }}.{{ domain['public'] }}' && evt.Meta.http_status == '404' && evt.Meta.http_verb == 'GET' &&  evt.Meta.http_path startsWith '/index.php/core/preview?'
 
 ### Deprecated solution
 - Access to fw

docs/services/common/crowdsec.md

@@ -234,9 +234,9 @@ fw@fw:~$ sudo cscli alerts inspect 230 -d
 
 - check the log and analyze and make expression
   - e.g. immich
-    - evt.Meta.target_fqdn == 'immich.ilnmors.com' && evt.Meta.http_path contains '/api/assets/' && evt.Meta.http_path contains '/thumbnail'
+    - "evt.Meta.target_fqdn == '{{ services['immich']['domain']['public'] }}.{{ domain['public'] }}' && evt.Meta.http_status == '404' && evt.Meta.http_verb == 'GET' && evt.Meta.http_path contains '/api/assets/' && evt.Meta.http_path contains '/thumbnail'"
   - e.g. opencloud
-    - "evt.Meta.target_fqdn == '{{ services['opencloud']['domain']['public'] }}.{{ domain['public'] }}' && evt.Meta.http_path contains '/js/chunks/'"
+    - "evt.Meta.target_fqdn == '{{ services['opencloud']['domain']['public'] }}.{{ domain['public'] }}' && evt.Meta.http_status in ['200', '304'] && evt.Meta.http_verb == 'GET' && evt.Meta.http_path contains '/js/chunks/'"
 - free false positive decision
 
 fw@fw:~$ sudo cscli decision list