Allow only exposing services over Tailscale

This works using public DNS, so doesn't need Tailscale's magic DNS to override my local.

ansible/group_vars/all/tailscale.yml

@@ -2,5 +2,6 @@
 tailscale_up_skip: true
 
 tailscale_cidr: 100.64.0.0/24  # It's really /10, but I don't use that many IPs
+tailscale_cidr_ipv6: fd7a:115c:a1e0::/120  # It's really /48, but I don't use that many IPs
 
 tailscale_port: 41641

ansible/group_vars/all/vps-hosts.yml

@@ -1,3 +1,5 @@
 "vps_hosts":
   "casey_ip": "213.219.38.11"
+  "private_ipv6_marker": "2a01:7e00:e000:7f7::1"
+  "private_ipv6_range": "2a01:7e00:e000:7f7::1/128"
   "walker_ip": "192.248.168.230"

ansible/roles/gateway/files/nginx.conf

@@ -21,6 +21,20 @@ map $ssl_preread_server_name $gateway_destination {
 server {
     listen 443;
     listen 8448;
+    listen [::]:443;
+    listen [::]:8448;
     proxy_pass $gateway_destination;
     proxy_protocol on;
 }
+
+server {
+    listen [{{ vps_hosts.private_ipv6_marker }}]:443;
+    listen [{{ vps_hosts.private_ipv6_marker }}]:8448;
+
+    access_log off;
+
+    deny all;
+
+    # This is never used, but need to keep nginx happy
+    proxy_pass 127.0.0.1:80;
+}

ansible/roles/ingress/files/nginx.conf

@@ -9,6 +9,8 @@ access_log /var/log/nginx/access.log access;
 server {
     listen 443;
     listen 8448;
+    listen [::]:443;
+    listen [::]:8448;
     proxy_pass {{ pve_hosts.docker.ip }}:443;
     proxy_protocol on;
     proxy_socket_keepalive on;

ansible/roles/pve_docker/files/whoami/docker-compose.yml

@@ -7,6 +7,9 @@ services:
     labels:
       - traefik.enable=true
       - traefik.http.routers.whoami.rule=Host(`whoami.theorangeone.net`) || Host(`whoami-cdn.theorangeone.net`)
+
+      - traefik.http.routers.whoami-private.rule=Host(`whoami-private.theorangeone.net`)
+      - traefik.http.routers.whoami-private.middlewares=tailscale-only@file
     networks:
       - default
       - traefik

ansible/roles/traefik/files/file-provider-main.yml

@@ -8,3 +8,9 @@ http:
       headers:
         customResponseHeaders:
           Permissions-Policy: interest-cohort=()
+
+    tailscale-only:
+      ipAllowList:
+        sourceRange:
+          - "{{ tailscale_cidr }}"
+          - "{{ tailscale_cidr_ipv6 }}"