improvement(nginx): Adjust nginx template to proper SSL/TLS cipher & protocols

Fixes: #97

examples/nginx-alpine-ssl/Dockerfile

@@ -3,6 +3,7 @@ RUN apk add nginx
 RUN mkdir -p /run/nginx
 ADD default.conf /etc/nginx/http.d/default.conf
 ADD *.key /etc/ssl/private/
+ADD *.pem /etc/ssl/private/
 ADD *.crt /etc/ssl/certs/
 WORKDIR /var/www/localhost/htdocs
 COPY entrypoint.sh /usr/local/bin

examples/nginx-alpine-ssl/default.conf

@@ -3,8 +3,33 @@ server {
     listen [::]:80 default_server;
     listen 443 ssl http2 default_server;
     listen [::]:443 ssl http2 default_server;
+
+    # SSL configuration
+    # SSL cert/key files
     ssl_certificate /etc/ssl/certs/nginx-selfsigned.crt;
     ssl_certificate_key /etc/ssl/private/nginx-selfsigned.key;
+    # For production regenerate this dhparam key by running:
+    # $> openssl dhparam -out dhparam.pem 4096
+    ssl_dhparam /etc/ssl/private/dhparam.pem;
+
+    # SSL ciphers/protocols
+    ssl_protocols TLSv1.3 TLSv1.2;
+    ssl_prefer_server_ciphers on;
+    ssl_ecdh_curve secp521r1:secp384r1;
+    ssl_ciphers EECDH+AESGCM:EECDH+AES256;
+
+    # SSL misc
+    ssl_session_cache shared:TLS:2m;
+    ssl_buffer_size 4k;
+
+    # OCSP stapling
+    ssl_stapling on;
+    ssl_stapling_verify on;
+    resolver 1.1.1.1 1.0.0.1 [2606:4700:4700::1111] [2606:4700:4700::1001]; # Cloudflare
+
+    # Set HSTS to 365 days
+    # Note: Activate this on production usage
+    #add_header Strict-Transport-Security 'max-age=31536000; includeSubDomains; preload' always;
 
     location /.well-known/webfinger {
         proxy_http_version      1.1;

examples/nginx-alpine-ssl/dhparam.pem

@@ -0,0 +1,13 @@
+-----BEGIN DH PARAMETERS-----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-----END DH PARAMETERS-----