Владислав

location ~* ^/admin {
        auth_basic                    "Admin page";
        auth_basic_user_file     /etc/nginx/nginx.pass;
    }

LOGIN="admin"
PASSWORD="pass"
OPENSSL=`echo "${PASSWORD}" | openssl passwd -1 -stdin -salt Nginx`
echo "${LOGIN}:${OPENSSL}" >>  /etc/nginx/nginx.pass