From 213029577e2f61de96d701fbb811a9ae09297317 Mon Sep 17 00:00:00 2001
From: Disassembler <disassembler@dasm.cz>
Date: Mon, 26 Jun 2017 15:17:55 +0200
Subject: [PATCH] Strengthen nginx SSL config - DH 2048, HSTS, lower SSL cache
 to 1MB

---
 basic.sh                                | 4 ++++
 basic/etc/nginx/sites-available/default | 4 +++-
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/basic.sh b/basic.sh
index f6b666a..e3076c2 100644
--- a/basic.sh
+++ b/basic.sh
@@ -59,6 +59,10 @@ apt-get -y --no-install-recommends install nginx-light uwsgi uwsgi-plugin-python
 openssl req -x509 -new -out /etc/ssl/certs/services.pem -keyout /etc/ssl/private/services.key -nodes -days 3654 -subj "/C=CZ/CN=$(hostname -f)"
 chmod 640 /etc/ssl/private/services.key
 
+# Create Diffie-Hellman param
+openssl dhparam -out /etc/ssl/dhparam.pem 2048
+chmod 640 /etc/ssl/dhparam.pem
+
 # Modify default nginx site
 mkdir /etc/nginx/apps-available /etc/nginx/apps-enabled
 mkdir /srv/portal
diff --git a/basic/etc/nginx/sites-available/default b/basic/etc/nginx/sites-available/default
index ed85897..c26e69c 100644
--- a/basic/etc/nginx/sites-available/default
+++ b/basic/etc/nginx/sites-available/default
@@ -12,10 +12,12 @@ server {
     ssl_certificate_key /etc/ssl/private/services.key;
     ssl_protocols TLSv1.2;
     ssl_ciphers 'ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA:ECDHE-RSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-RSA-AES256-SHA256:DHE-RSA-AES256-SHA:ECDHE-ECDSA-DES-CBC3-SHA:ECDHE-RSA-DES-CBC3-SHA:EDH-RSA-DES-CBC3-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:DES-CBC3-SHA:!DSS';
+    ssl_dhparam /etc/ssl/dhparam.pem;
     ssl_prefer_server_ciphers on;
-    ssl_session_cache shared:SSL:30m;
+    ssl_session_cache shared:SSL:1m;
     ssl_session_timeout 1d;
     ssl_session_tickets off;
+    add_header Strict-Transport-Security "max-age=31536000;";
 
     root /srv/portal;
     index index.html;