Nginx – Website response from Nginx empty over TLS in firefox, but fine over http and in other browsers

firefoxlets-encryptnginxnode.jsssl-certificate

I already posted here: https://stackoverflow.com/questions/41138169/website-does-not-open-in-firefox-no-error-opens-in-chrome-and-safari-though but I guess serverfault might actually be the better place to ask.

My problem:
My website veare.de works fine over https in chrome and safari, however it does not work in firefox. I get an empty response body from the request.
It does work over http though.

My setup:

I have an ubuntu 16.04 server running Docker with an Nginx 1.11.6 container as a proxy to my node server which returns static sites.

I have an ssl cert from let's encrypt.

My nginx config is the following

############################
#
# Redirect all www to non-www
#
#
server {
    listen 443 ssl http2;
    listen [::]:443 ssl http2;
    server_name www.veare.de;
    ssl_certificate /etc/letsencrypt/live/www.veare.de/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/www.veare.de/privkey.pem;
    return 301 https://veare.de$request_uri;
}
##########################
# HTTPS
server {
    server_name veare.de;
    ssl_certificate /etc/letsencrypt/live/veare.de/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/veare.de/privkey.pem;

    listen 80;
    listen [::]:80;
    listen 443 ssl http2;
    listen [::]:443 ssl http2;

# access_log
    access_log            /var/log/nginx/access.log;
    # proxy_pass config
    location / {
        # include proxy presets
        include /etc/nginx/includes/proxy.conf;
        proxy_pass              http://lukasoppermann.com$uri;
    }

    ssl_dhparam /etc/letsencrypt/dhparam.pem;

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

    # modern configuration. tweak to your needs.
    ssl_protocols TLSv1.2;
    ssl_ciphers 'ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES1$
    ssl_prefer_server_ciphers on;

    # HSTS (ngx_http_headers_module is required) (15768000 seconds = 6 months)
    add_header Strict-Transport-Security max-age=15768000;

    # OCSP Stapling ---
    # fetch OCSP records from URL in ssl_certificate and cache them
    ssl_stapling on;
    ssl_stapling_verify on;

    # set expire header for static files
    # include /etc/nginx/includes/expire_header.conf;
    # Default Content Security Policy
    include /etc/nginx/includes/csp.conf;

    root         /var/www/html;

}

Do you have any idea what it could be? Please let me know if you need more info. Thanks.

Best Answer

Okay, thanks to @Tim I found it out. Firefox choked on my CSP header.

I actually had it set like this:

add_header Content-Security-Policy "
    default-src 'self';
    script-src 'self' www.google-analytics.com;
    img-src 'self' www.google-analytics.com data:;
    style-src 'self' 'unsafe-inline' fonts.googleapis.com;
    font-src 'self' fonts.gstatic.com;
    frame-src 'self';
    connect-src 'self' apis.google.com;
    object-src 'none';
    report-uri https://veare.report-uri.io/r/default/csp/enforce
";

Which apparently works in all browser but Firefox. Setting it like so fixed it:

add_header Content-Security-Policy "default-src 'self'; script-src 'self' www.google-analytics.com; img-src 'self' www.google-analytics.com data:;style-src 'self' 'unsafe-inline' fonts.googleapis.com; font-src 'self' fonts.gstatic.com; child-src 'self'; connect-src 'self' apis.google.com; object-src 'none'; report-uri https://veare.report-uri.io/r/default/csp/enforce";

Thanks again for the help.

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