From cd13c189b10f4060cadbf912ff9016eb22a890b1 Mon Sep 17 00:00:00 2001
From: julian <julian@jsts.xyz>
Date: Thu, 14 Sep 2023 22:12:38 +0200
Subject: [PATCH] Configure Public-Reverse-Proxy

---
 .../public-reverse-proxy/configuration.nix    |  7 ++
 config/hosts/public-reverse-proxy/default.nix |  8 +++
 config/hosts/public-reverse-proxy/nginx.nix   | 66 +++++++++++++++++++
 flake.nix                                     | 14 ++++
 4 files changed, 95 insertions(+)
 create mode 100644 config/hosts/public-reverse-proxy/configuration.nix
 create mode 100644 config/hosts/public-reverse-proxy/default.nix
 create mode 100644 config/hosts/public-reverse-proxy/nginx.nix

diff --git a/config/hosts/public-reverse-proxy/configuration.nix b/config/hosts/public-reverse-proxy/configuration.nix
new file mode 100644
index 0000000..31aa8e8
--- /dev/null
+++ b/config/hosts/public-reverse-proxy/configuration.nix
@@ -0,0 +1,7 @@
+{ config, pkgs, ... }:
+
+{
+  networking.hostName = "public-reverse-proxy";
+
+  system.stateVersion = "23.05";
+}
diff --git a/config/hosts/public-reverse-proxy/default.nix b/config/hosts/public-reverse-proxy/default.nix
new file mode 100644
index 0000000..20dd895
--- /dev/null
+++ b/config/hosts/public-reverse-proxy/default.nix
@@ -0,0 +1,8 @@
+{ config, pkgs, ... }:
+
+{
+  imports = [
+    ./configuration.nix
+    ./nginx.nix
+  ];
+}
diff --git a/config/hosts/public-reverse-proxy/nginx.nix b/config/hosts/public-reverse-proxy/nginx.nix
new file mode 100644
index 0000000..b9f5ac6
--- /dev/null
+++ b/config/hosts/public-reverse-proxy/nginx.nix
@@ -0,0 +1,66 @@
+# Sources for this configuration:
+# - https://nixos.wiki/wiki/Nginx
+# - https://nixos.org/manual/nixos/stable/#sec-firewall
+# - https://git.grzb.de/yuri/nix-infra/-/tree/3896d34f4f7f3b5dd5cbd270a14b56b102ef3a2a/hosts/web-public-2
+
+{ config, pkgs, ... }:
+
+{
+  services.nginx.streamConfig = ''
+    map $ssl_preread_server_name $address {
+        status.ccchh.net 10.31.206.15:8443;
+    }
+
+    # Listen on port 443 as a reverse proxy and use PROXY Protocol for the
+    # upstreams.
+    server {
+        listen 0.0.0.0:443;
+        proxy_pass $address;
+        ssl_preread on;
+        proxy_protocol on;
+    }
+  '';
+
+  services.nginx.appendHttpConfig = ''
+    map $host $upstream_acme_challenge_host {
+        club-assistant.ccchh.net 10.31.208.10;
+        netbox.ccchh.net 10.31.208.29;
+        light.ccchh.net 10.31.208.23;
+        thinkcccore0.ccchh.net 10.31.242.3;
+        thinkcccore1.ccchh.net 10.31.242.4;
+        thinkcccore2.ccchh.net 10.31.242.5;
+        thinkcccore3.ccchh.net 10.31.242.6;
+        zigbee2mqtt.ccchh.net 10.31.208.25:31820;
+        esphome.ccchh.net 10.31.208.24:31820;
+        proxmox-backup-server.ccchh.net 10.31.208.28;
+        status.ccchh.net 10.31.206.15:31820;
+        default "";
+    }
+  '';
+
+  services.nginx = {
+    enable = true;
+
+    virtualHosts."well-known_acme-challenge" = {
+      default = true;
+
+      listen = [{
+        addr = "0.0.0.0";
+        port = 80;
+      }];
+
+      locations."/.well-known/acme-challenge/" = {
+        proxyPass = "http://$upstream_acme_challenge_host";
+      };
+
+      # Better safe than sorry.
+      # Don't do a permanent redirect to avoid acme challenge pain.
+      locations."/" = {
+        return = "307 https://$host$request_uri";
+      };
+    };
+  };
+
+  networking.firewall.allowedTCPPorts = [ 80 443 ];
+  networking.firewall.allowedUDPPorts = [ 443 ];
+}
diff --git a/flake.nix b/flake.nix
index c2b93b2..284037b 100644
--- a/flake.nix
+++ b/flake.nix
@@ -48,6 +48,20 @@
           ./config/hosts/audio
         ];
       };
+
+      public-reverse-proxy = {
+        deployment = {
+          targetHost = "public-reverse-proxy.z9.ccchh.net";
+          targetPort = 22;
+          targetUser = "colmena-deploy";
+          tags = [ "thinkcccluster" ];
+        };
+        imports = [ 
+          ./config/common
+          ./config/proxmox-vm
+          ./config/hosts/public-reverse-proxy
+        ];
+      };
     };
 
     packages.x86_64-linux = {