# http://nginx.org/en/docs/http/websocket.html
map $http_upgrade $connection_upgrade {
    default upgrade;
    '' close;
}

# http server
server {
    listen       80;
    listen       [::]:80;

    server_name  gitlab.c2a-systeme.fr;

    location / {
        # redirect everything to HTTPS
        return 301 https://$host$request_uri;
    }
}

# https server
server {
    server_name  gitlab.c2a-systeme.fr;
    listen       443 http2;
    listen       [::]:443 http2;

    ssl                  on;
    ssl_certificate      /etc/letsencrypt/live/gitlab.c2a-systeme.fr/fullchain.pem;
    ssl_certificate_key  /etc/letsencrypt/live/gitlab.c2a-systeme.fr/privkey.pem;
    ssl_session_timeout  10m;
    ssl_session_cache shared:SSL:50m;

    # Enable server-side protection against BEAST attacks
    ssl_protocols TLSv1 TLSv1.1 TLSv1.2; # don't use SSLv3 ref: POODLE
    ssl_prefer_server_ciphers on;
    ssl_ciphers "ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA384";
        
    # RFC-7919 recommended: https://wiki.mozilla.org/Security/Server_Side_TLS#ffdhe4096
    ssl_dhparam /etc/ssl/ffdhe4096.pem;
    ssl_ecdh_curve secp521r1:secp384r1;

    # Aditional Security Headers
    # ref: https://developer.mozilla.org/en-US/docs/Security/HTTP_Strict_Transport_Security
    add_header Strict-Transport-Security "max-age=31536000; includeSubDomains";

    # ref: https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-Frame-Options
    add_header X-Frame-Options DENY always;

    # ref: https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-Content-Type-Options
    add_header X-Content-Type-Options nosniff always;

    # ref: https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-XSS-Protection
    add_header X-Xss-Protection "1; mode=block" always;

    # Enable OCSP stapling 
    # ref. http://blog.mozilla.org/security/2013/07/29/ocsp-stapling-in-firefox
    ssl_stapling on;
    ssl_stapling_verify on;
    ssl_trusted_certificate /etc/letsencrypt/live/gitlab.c2a-systeme.fr/fullchain.pem;
    resolver 1.1.1.1 1.0.0.1 [2606:4700:4700::1111] [2606:4700:4700::1001] valid=300s; # Cloudflare
    resolver_timeout 5s;

    # https://developer.mozilla.org/en-US/docs/Web/HTTP/X-Frame-Options
    add_header X-Frame-Options "SAMEORIGIN";
    proxy_hide_header X-Frame-Options;

    # https://github.com/twitter/secureheaders
    # https://www.owasp.org/index.php/OWASP_Secure_Headers_Project#tab=Compatibility_Matrix
    # https://wiki.mozilla.org/Security/Guidelines/Web_Security
    add_header X-XSS-Protection "1; mode=block";
    proxy_hide_header X-XSS-Protection;
    add_header X-Download-Options "noopen";
    proxy_hide_header X-Download-Options;
    add_header X-Content-Type-Options "nosniff";
    proxy_hide_header X-Content-Type-Options;
    add_header X-Permitted-Cross-Domain-Policies "none";
    proxy_hide_header X-Permitted-Cross-Domain-Policies;
    add_header Referrer-Policy "no-referrer-when-downgrade";
    proxy_hide_header Referrer-Policy;


    proxy_http_version 1.1;
    proxy_intercept_errors on;
    proxy_read_timeout       3500;
    proxy_connect_timeout    3250;

    proxy_set_header   Host               $host;
    proxy_set_header   X-Forwarded-For    $remote_addr;
    proxy_set_header   X-Forwarded-Host   $host;
    proxy_set_header   X-Forwarded-Port   $server_port;
    proxy_set_header   X-Forwarded-Proto  https;
    proxy_set_header   X-Forwarded-Ssl    on;

    # upgrade is a hop-by-hop header (http://nginx.org/en/docs/http/websocket.html)
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection $connection_upgrade;

    # Required for LE certificate enrollment using certbot
    location '/.well-known/acme-challenge' {
        default_type "text/plain";
        root /var/www/html;
    }

    location / {
        # No buffering to temp files, it fails for large downloads
        proxy_max_temp_file_size 0;

        # Disable check to allow unlimited body sizes. this allows apps to accept whatever size they want
        client_max_body_size 0;

        # Bloc accès of the search robots
        location = /robots.txt {
            return 200 "User-agent: *\nDisallow: /";
        }

        proxy_pass http://127.0.0.1:8001;

    }
}