(ids) add template for user defined rules

(cherry picked from commit 32c774fb)

src/opnsense/service/templates/OPNsense/IDS/+TARGETS

@@ -5,3 +5,4 @@ newsyslog.conf:/etc/newsyslog.conf.d/suricata
 rule-updater.config:/usr/local/etc/suricata/rule-updater.config
 classification.config:/usr/local/etc/suricata/classification.config
 reference.config:/usr/local/etc/suricata/reference.config
+OPNsense.rules:/usr/local/etc/suricata/rules/OPNsense.rules

src/opnsense/service/templates/OPNsense/IDS/OPNsense.rules

+# AUTO GENERATED, DO NOT EDIT.
+#
+# OPNsense.rules
+# User defined rules
+#
+
+# -- SSL fingerprint rules
+{% if helpers.exists('OPNsense.IDS.rules.fingerprint') %}
+{%      for rule in helpers.toList('OPNsense.IDS.rules.fingerprint') %}
+{{rule.action}}  tls any any -> any any (msg:"{{rule.description.replace('"','\"')}}"; tls.fingerprint:"{{rule.fingerprint.lower()}}"; sid:{{4294967295 - loop.index}}; rev:1;)
+{%      endfor %}
+{% endif %}