Nginx example for reverse proxy with ssl-client cert auth
<code>
server {
    listen 443 ssl;
    listen [::]:443 ssl;

    include /etc/nginx/snippets/kc-certs.conf;
    include /etc/nginx/snippets/kc-ssl-params.conf;

    server_name example.org;
    ssl_client_certificate /etc/ssl/private/kc-ca.cert.pem;
    ssl_verify_client on;

      location / {
            proxy_pass http://127.0.0.1:8083;
            proxy_set_header X-Real-IP $remote_addr;
            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
            proxy_set_header Host $host;
         }
}

</code>
file kc-certs.conf
<code>
ssl_certificate /etc/ssl/private/kc-server.crt;
ssl_certificate_key /etc/ssl/private/kc-server.key;
</code>
file kc-ssl-params.conf
<code>
# should be also TLSv1.3 if possible
ssl_protocols TLSv1.2;
ssl_prefer_server_ciphers on;
ssl_dhparam /etc/nginx/dhparam.pem; 
ssl_ciphers EECDH+AESGCM:EDH+AESGCM;
ssl_ecdh_curve secp384r1;
ssl_session_timeout  10m;
ssl_session_cache shared:SSL:10m;
ssl_session_tickets off;
ssl_stapling off;
ssl_stapling_verify off;
# replace follwing with local dns
resolver 8.8.8.8 valid=300s;
resolver_timeout 5s;
# Disable strict transport security for now. You can uncomment the following
# line if you understand the implications.
#add_header Strict-Transport-Security "max-age=63072000; includeSubDomains; preload";
add_header X-Frame-Options DENY;
add_header X-Content-Type-Options nosniff;
add_header X-XSS-Protection "1; mode=block";

</code>

----

ansible role for adding client certs to firefox/chrome on the clients

https://warlord0blog.wordpress.com/2020/03/04/ansible-and-client-certificates/