Generate unique DHE parameters on first bootstrap

diff --git a/templates/web.ssl.template.yml b/templates/web.ssl.template.yml
index 740311f0db75d5df1f5f181baed9ab8d6f5a86df..fd72cf293770bb5508fc0861b99d9e0e93980565 100644 (file)
--- a/templates/web.ssl.template.yml
+++ b/templates/web.ssl.template.yml
@@ -1,4 +1,9 @@
 run:
+  - exec:
+     cmd:
+       # Generate strong Diffie-Hellman parameters
+       - "mkdir -p /shared/ssl/"
+       - "[ ! -e /shared/ssl/dhparams.pem ] && openssl dhparam -out /shared/ssl/dhparams.pem 2048 || true"
   - replace:
      filename: "/etc/nginx/conf.d/discourse.conf"
      from: /server.+{/
@@ -22,6 +27,7 @@ run:
 
        ssl_certificate /shared/ssl/ssl.crt;
        ssl_certificate_key /shared/ssl/ssl.key;
+       ssl_dhparam /shared/ssl/dhparams.pem;
 
        ssl_session_tickets off;
        ssl_session_cache shared:SSL:1m;