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SSL Best config#

All tests are made with https://www.ssllabs.com/ssltest/

By default, the SSl configuration is not secure. We will see how to improve the security of our web services.

Nginx#

  • Default configuration:
    • Config: 
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      server {
    listen 443 http2 ssl;
    server_name test.sile.tech;

    ssl_certificate     /etc/nginx/ssl/test.sile.tech_cert.crt;
    ssl_certificate_key /etc/nginx/ssl/test.sile.tech_privkey.crt;

    location / {
        root   /usr/share/nginx/html;
        index  index.html index.htm;
    }

    location = /50x.html {
        root   /usr/share/nginx/html;
    }
}
    • Note: B
  • New configuration:
    • Config: 
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      server {
    listen 443 http2 ssl;
    server_name test.sile.tech;

    ssl_certificate     /etc/nginx/ssl/test.sile.tech_fullchain.crt;
    ssl_certificate_key /etc/nginx/ssl/test.sile.tech_privkey.crt;
    ssl_dhparam         /etc/nginx/ssl/dhparam.pem;

    # SSL Settings
    ssl_protocols TLSv1.2 TLSv1.3;
    ssl_ciphers ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384;
    ssl_prefer_server_ciphers off;

    ssl_session_timeout 1d;
    ssl_session_cache   shared:SSL:10m;
    ssl_session_tickets off;

    # OCSP stapling
    ssl_stapling            on;
    ssl_stapling_verify     on;
    ssl_trusted_certificate /etc/nginx/ssl/test.sile.tech_chain.crt;
    resolver                1.1.1.1 208.67.222.222;

    add_header Strict-Transport-Security "max-age=63072000" always;

    location / {
        root   /usr/share/nginx/html;
        index  index.html index.htm;
    }

    location = /50x.html {
        root   /usr/share/nginx/html;
    }
}
    • Note: A+

HAProxy#

  • Default configuration:
    • Config: 
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      global
    default-path config
    zero-warning
    user haproxy
    group haproxy
    hard-stop-after 5m
    log stdout format raw local0 info
    • Note: A
  • New configuration:
    • Config: 
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      global
    default-path config
    zero-warning
    user haproxy
    group haproxy
    hard-stop-after 5m
    log stdout format raw local0 info
    ssl-default-bind-ciphers ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384
    ssl-default-bind-options no-sslv3 no-tlsv10 no-tlsv11
    ssl-default-server-ciphers ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384
    ssl-default-server-options no-sslv3 no-tlsv10 no-tlsv11
    • add this line to each https frontend: 
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      http-response set-header Strict-Transport-Security "max-age=63072000; includeSubDomains; preload;"
    • Note: A+