# Jumphost Reverse-Proxy-Konfiguration (Konzept 6.6/7.2a/9).
# tls_mode = {{ tls_mode }}

{% if tls_mode == 'external_reverse_proxy' %}
# Nur der vorgelagerte externe Reverse Proxy darf X-Forwarded-For/-Proto
# setzen -- sonst waere das Audit-Log-Feld client_ip faelschbar (Konzept 7.2a).
set_real_ip_from {{ external_reverse_proxy_cidr }};
real_ip_header    X-Forwarded-For;
real_ip_recursive on;
{% endif %}

# E8 (Umsetzungsauftrag Teil E): jumphost_login_rate_limit ist ein
# group_vars-Wert (siehe ansible/inventory/group_vars/all.yml), keine
# feste Konstante -- muss zusammen mit app.config.settings.
# login_rate_limit_* und der fail2ban-Schwelle (ansible/roles/fail2ban)
# als bewusste Betriebsentscheidung festgelegt werden (IP-basiertes
# Limit, betrifft alle Benutzer hinter derselben NAT-Adresse gemeinsam).
limit_req_zone $binary_remote_addr zone=jumphost_login:10m rate={{ jumphost_login_rate_limit }};

server {
{% if tls_mode == 'external_reverse_proxy' and internal_hop_plaintext_accepted %}
    # Bewusste, dokumentierte Ausnahme (Konzept 7.2a): Klartext-HTTP auf der
    # Strecke externer Proxy -> Jumphost, nur zulaessig in einem eigenen,
    # zugriffskontrollierten Netzsegment.
    listen 443;
{% else %}
    listen 443 ssl;
    ssl_certificate     /etc/jumphost/tls/server.crt;
    ssl_certificate_key /etc/jumphost/tls/server.key;
    ssl_protocols       TLSv1.3;
    ssl_session_cache   shared:jumphost_ssl:10m;
{% endif %}

    server_name {{ acme_domain | default('_') }};

    add_header Strict-Transport-Security "max-age=63072000; includeSubDomains" always;
    add_header X-Frame-Options "DENY" always;
    add_header X-Content-Type-Options "nosniff" always;
    add_header Referrer-Policy "no-referrer" always;

    client_max_body_size 210m;   # etwas ueber MAX_UPLOAD_BYTES der App (Konzept 6.6)

    location /auth/login {
        limit_req zone=jumphost_login burst=5 nodelay;
        proxy_pass http://unix:{{ jumphost_listen_uds }}:;
        include /etc/nginx/snippets/jumphost_proxy_headers.conf;
    }

    location /ws/ {
        proxy_pass http://unix:{{ jumphost_listen_uds }}:;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
        proxy_read_timeout 3600s;
        include /etc/nginx/snippets/jumphost_proxy_headers.conf;
    }

    location / {
        proxy_pass http://unix:{{ jumphost_listen_uds }}:;
        include /etc/nginx/snippets/jumphost_proxy_headers.conf;
    }
}

server {
    listen 80;
    server_name {{ acme_domain | default('_') }};
    location /.well-known/acme-challenge/ { root /var/www/html; }
    location / { return 301 https://$host$request_uri; }
}