Enable https and --preload on the admin to improve letsencrypt support

nginx/nginx.conf.default

@@ -0,0 +1,96 @@
+#  Basic configuration
+user nginx;
+worker_processes  1;
+error_log /dev/stderr info;
+pid /var/run/nginx.pid;
+
+events {
+    worker_connections  1024;
+}
+
+# Environment variables used in the configuration
+env WEBMAIL;
+env WEBDAV;
+env EXPOSE_ADMIN;
+
+http {
+    # Standard HTTP configuration with slight hardening
+    include /etc/nginx/mime.types;
+    default_type application/octet-stream;
+    access_log /dev/stdout;
+    sendfile on;
+    keepalive_timeout  65;
+    server_tokens off;
+
+    server {
+      listen 80;
+      listen 443 ssl;
+
+      # TLS configuration hardened according to:
+      # https://bettercrypto.org/static/applied-crypto-hardening.pdf
+      ssl_protocols TLSv1.1 TLSv1.2;
+      ssl_ciphers 'EDH+CAMELLIA:EDH+aRSA:EECDH+aRSA+AESGCM:EECDH+aRSA+SHA256:EECDH:+CAMELLIA128:+AES128:+SSLv3:!aNULL:!eNULL:!LOW:!3DES:!MD5:!EXP:!PSK:!DSS:!RC4:!SEED:!IDEA:!ECDSA:kEDH:CAMELLIA128-SHA:AES128-SHA';
+      ssl_prefer_server_ciphers on;
+      ssl_session_timeout 5m;
+      ssl_session_cache shared:SSL:50m;
+      ssl_certificate /certs/cert.pem;
+      ssl_certificate_key /certs/key.pem;
+
+      add_header Strict-Transport-Security max-age=15768000;
+
+      if ($scheme = http) {
+    		return 301 https://$host$request_uri;
+    	}
+
+      # Load Lua variables
+      set_by_lua $webmail 'return os.getenv("WEBMAIL")';
+      set_by_lua $webdav 'return os.getenv("WEBDAV")';
+      set_by_lua $expose_admin 'return os.getenv("EXPOSE_ADMIN")';
+
+      # Actual logic
+
+      location / {
+        if ($webmail != none) {
+          return 301 $scheme://$host/webmail/;
+        }
+
+        if ($webmail = none) {
+          return 403;
+        }
+      }
+
+      location /webmail {
+        if ($webmail != none) {
+          proxy_pass http://webmail;
+        }
+
+        if ($webmail = none) {
+          return 403;
+        }
+      }
+
+      location /admin {
+        if ($expose_admin = yes) {
+          proxy_pass http://admin;
+        }
+
+        if ($expose_admin != yes) {
+          return 403;
+        }
+      }
+
+      location /webdav {
+        if ($webdav != none) {
+          proxy_pass http://webdav:5232;
+        }
+
+        if ($webdav = none) {
+          return 403;
+        }
+      }
+
+      location /.well-known/acme-challenge {
+        proxy_pass http://admin:8081;
+      }
+    }
+}