From 9fd3aa0cd3ad72618075db3a12173fe849e944fa Mon Sep 17 00:00:00 2001
From: "Dustin C. Hatch" <dustin@hatch.name>
Date: Thu, 21 Sep 2023 22:24:08 -0500
Subject: [PATCH] frigate: Configure nginx reverse proxy

Using nginx, we can expose the Frigate web server via HTTPS.  Since
Frigate has no built-in authentication, we need to use Authelia via the
nginx proxy auth feature.
---
 frigate.nginx   | 77 +++++++++++++++++++++++++++++++++++++++++++++++++
 frigate.yaml    |  4 +++
 nginx.container |  1 +
 3 files changed, 82 insertions(+)
 create mode 100644 frigate.nginx

diff --git a/frigate.nginx b/frigate.nginx
new file mode 100644
index 0000000..3bb6f60
--- /dev/null
+++ b/frigate.nginx
@@ -0,0 +1,77 @@
+# vim: set sw=4 ts=4 sts=4 et :
+
+resolver 127.0.0.53;
+
+set $upstream_authelia https://auth.pyrocufflink.blue/api/verify;
+
+## Virtual endpoint created by nginx to forward auth requests.
+location /authelia {
+    ## Essential Proxy Configuration
+    internal;
+    proxy_pass $upstream_authelia;
+
+    ## Headers
+    ## The headers starting with X-* are required.
+    proxy_set_header X-Original-URL $scheme://$http_host$request_uri;
+    proxy_set_header X-Original-Method $request_method;
+    proxy_set_header X-Forwarded-Method $request_method;
+    proxy_set_header X-Forwarded-Proto $scheme;
+    proxy_set_header X-Forwarded-Host $http_host;
+    proxy_set_header X-Forwarded-Uri $request_uri;
+    proxy_set_header X-Forwarded-For $remote_addr;
+    proxy_set_header Content-Length "";
+    proxy_set_header Connection "";
+
+    ## Basic Proxy Configuration
+    proxy_pass_request_body off;
+    proxy_next_upstream error timeout invalid_header http_500 http_502 http_503; # Timeout if the real server is dead
+    proxy_redirect http:// $scheme://;
+    proxy_http_version 1.1;
+    proxy_cache_bypass $cookie_session;
+    proxy_no_cache $cookie_session;
+    proxy_buffers 4 32k;
+    client_body_buffer_size 128k;
+
+    ## Advanced Proxy Configuration
+    send_timeout 5m;
+    proxy_read_timeout 240;
+    proxy_send_timeout 240;
+    proxy_connect_timeout 240;
+}
+
+location / {
+    ## Send a subrequest to Authelia to verify if the user is authenticated and has permission to access the resource.
+    auth_request /authelia;
+
+    ## Set the $target_url variable based on the original request.
+
+    ## Comment this line if you're using nginx without the http_set_misc module.
+    set_escape_uri $target_url $scheme://$http_host$request_uri;
+
+    ## Uncomment this line if you're using NGINX without the http_set_misc module.
+    # set $target_url $scheme://$http_host$request_uri;
+
+    ## Save the upstream response headers from Authelia to variables.
+    auth_request_set $user $upstream_http_remote_user;
+    auth_request_set $groups $upstream_http_remote_groups;
+    auth_request_set $name $upstream_http_remote_name;
+    auth_request_set $email $upstream_http_remote_email;
+
+    ## Inject the response headers from the variables into the request made to the backend.
+    proxy_set_header Remote-User $user;
+    proxy_set_header Remote-Groups $groups;
+    proxy_set_header Remote-Name $name;
+    proxy_set_header Remote-Email $email;
+
+    ## If the subreqest returns 200 pass to the backend, if the subrequest returns 401 redirect to the portal.
+    error_page 401 =302 https://auth.pyrocufflink.blue/?rd=$target_url;
+
+    proxy_pass http://127.0.0.1:5000/;
+    proxy_set_header Host $host;
+    proxy_set_header X-Forwarded-Proto $scheme;
+    proxy_set_header X-Real-IP $remote_addr;
+    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+    proxy_set_header Upgrade $http_upgrade;
+    proxy_set_header Connection $http_connection;
+    proxy_http_version 1.1;
+}
diff --git a/frigate.yaml b/frigate.yaml
index 937118e..6132a3a 100644
--- a/frigate.yaml
+++ b/frigate.yaml
@@ -23,6 +23,10 @@ storage:
       id: 209
     contents:
       local: frigate.env
+  - path: /etc/nginx/default.d/frigate.conf
+    mode: 0644
+    contents:
+      local: frigate.nginx
 
 systemd:
   units:
diff --git a/nginx.container b/nginx.container
index 88dfbaa..6212f50 100644
--- a/nginx.container
+++ b/nginx.container
@@ -17,6 +17,7 @@ Network=host
 
 [Service]
 Restart=always
+ExecReload=/usr/bin/podman exec -i systemd-%N nginx -s reload
 
 [Install]
 WantedBy=multi-user.target