web proxy: better plugin support

PR: https://github.com/opnsense/core/pull/1328/

(cherry picked from commit 2dac5fd2)
(cherry picked from commit 6b14bb27)
(cherry picked from commit b376646f)

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

@@ -4,3 +4,6 @@ newsyslog.conf:/etc/newsyslog.conf.d/squid
 externalACLs.conf:/usr/local/etc/squid/externalACLs.conf
 nobumpsites.acl:/usr/local/etc/squid/nobumpsites.acl
 ca.pem.id:/usr/local/etc/squid/ca.pem.id
+pre-auth.conf:/usr/local/etc/squid/pre-auth/dummy.conf
+auth.conf:/usr/local/etc/squid/auth/dummy.conf
+post-auth.conf:/usr/local/etc/squid/post-auth/dummy.conf

src/opnsense/service/templates/OPNsense/Proxy/auth.conf

+# AUTOGENERATED FILE. DO NOT EDIT.
+# DO NOT REMOVE THIS FILE!
+# This directory is for auth config files

src/opnsense/service/templates/OPNsense/Proxy/post-auth.conf

+# AUTOGENERATED FILE. DO NOT EDIT.
+# DO NOT REMOVE THIS FILE!
+# This directory is for post-auth config files

src/opnsense/service/templates/OPNsense/Proxy/pre-auth.conf

+# AUTOGENERATED FILE. DO NOT EDIT.
+# DO NOT REMOVE THIS FILE!
+# This directory is for pre-auth config files

src/opnsense/service/templates/OPNsense/Proxy/squid.acl.conf

@@ -116,6 +116,9 @@ adaptation_access request_mod deny to_localhost
 {% endif %}
 http_access deny to_localhost
 
+# Auth plugins
+include /usr/local/etc/squid/auth/*.conf
+
 #
 # Access Permission configuration:
 #

src/opnsense/service/templates/OPNsense/Proxy/squid.conf

@@ -259,11 +259,13 @@ icap_enable off
 {% include ['OPNsense/Proxy/squid.user.alt_auth.conf', 'OPNsense/Proxy/squid.user.local_auth.conf'] %}
 {% endif %}
 
-{% include "OPNsense/Proxy/squid.user.pre_auth.conf" ignore missing with context %}
+# Pre-auth plugins
+include /usr/local/etc/squid/pre-auth/*.conf
 
 {% include "OPNsense/Proxy/squid.acl.conf" ignore missing with context %}
 
-{% include "OPNsense/Proxy/squid.user.post_auth.conf" ignore missing with context %}
+# Post-auth plugins
+include /usr/local/etc/squid/post-auth/*.conf
 
 # Caching settings
 {% if helpers.exists('OPNsense.proxy.general.cache.local') %}