amcedns to enable Let's Encrypt DNS-01 challenges

resources/chaosknoten/acmedns/nginx/acmedns.hamburg.ccc.de.conf

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+# partly generated 2022-01-08, Mozilla Guideline v5.6, nginx 1.17.7, OpenSSL 1.1.1k, intermediate configuration
+# https://ssl-config.mozilla.org/#server=nginx&version=1.17.7&config=intermediate&openssl=1.1.1k&guideline=5.6
+server {
+    # Listen on a custom port for the proxy protocol.
+    listen [::]:8443 ssl http2 proxy_protocol;
+    # Make use of the ngx_http_realip_module to set the $remote_addr and
+    # $remote_port to the client address and client port, when using proxy
+    # protocol.
+    # First set our proxy protocol proxy as trusted.
+    set_real_ip_from 2a00:14b0:4200:3000:125::1;
+    # Then tell the realip_module to get the addreses from the proxy protocol
+    # header.
+    real_ip_header proxy_protocol;
+
+    server_name acmedns.hamburg.ccc.de;
+
+    root /ansible_docker_compose/configs/html/;
+
+    ssl_certificate /etc/letsencrypt/live/acmedns.hamburg.ccc.de/fullchain.pem;
+    ssl_certificate_key /etc/letsencrypt/live/acmedns.hamburg.ccc.de/privkey.pem;
+    # verify chain of trust of OCSP response using Root CA and Intermediate certs
+    ssl_trusted_certificate /etc/letsencrypt/live/acmedns.hamburg.ccc.de/chain.pem;
+
+    # HSTS (ngx_http_headers_module is required) (63072000 seconds)
+    add_header Strict-Transport-Security "max-age=63072000" always;
+
+    proxy_set_header Host $host;
+    proxy_set_header X-Forwarded-Host $host;
+    proxy_set_header X-Real-IP $remote_addr;
+    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+    proxy_set_header X-Forwarded-Port 443;
+    # This is https in any case.
+    proxy_set_header X-Forwarded-Proto https;
+    # Hide the X-Forwarded header.
+    proxy_hide_header X-Forwarded;
+    # Assume we are the only Reverse Proxy (well using Proxy Protocol, but that
+    # is transparent).
+    # Also provide "_hidden" for by, since it's not relevant.
+    proxy_set_header Forwarded "for=$remote_addr;proto=https;host=$host;by=_hidden";
+    proxy_buffer_size 8k; # needed for oauth2-proxy to work correctly
+    port_in_redirect off;
+
+    location /oauth2/ {
+        proxy_pass       http://127.0.0.1:4180;
+        proxy_set_header Host                    $host;
+        proxy_set_header X-Real-IP               $remote_addr;
+        proxy_set_header X-Auth-Request-Redirect $request_uri;
+        # or, if you are handling multiple domains:
+        # proxy_set_header X-Auth-Request-Redirect $scheme://$host$request_uri;
+    }
+
+    location = /oauth2/auth {
+        proxy_pass       http://127.0.0.1:4180;
+        proxy_set_header Host             $host;
+        proxy_set_header X-Real-IP        $remote_addr;
+        proxy_set_header X-Forwarded-Uri  $request_uri;
+        # nginx auth_request includes headers but not body
+        proxy_set_header Content-Length   "";
+        proxy_pass_request_body           off;
+    }
+
+    location = / {
+        auth_request /oauth2/auth;
+        error_page 401 = @oauth2_signin;
+
+        index index.html;
+    }
+
+    location = /register {
+        auth_request /oauth2/auth;
+        error_page 401 = @oauth2_signin;
+
+        proxy_pass http://127.0.0.1:8080/register;
+    }
+
+    location = /update { # no auth by proxy required
+        proxy_pass http://127.0.0.1:8080/update;
+    }
+
+    location @oauth2_signin {
+        return 302 /oauth2/sign_in?rd=$scheme://$host$request_uri;
+    }
+}