OWASP/SSO_Project

geo $trustedupstream {
    default 0;
    ${TRUSTEDPROXYIP} 1;
}

server {
    listen 80;
    server_name ${DOMAIN};
    server_tokens off;

    location /.well-known/acme-challenge/ {
        root /var/www/certbot;
    }

    location / {
        return 301 https://$host$request_uri;
    }
}

server {
    listen 443 ssl;
    server_name ${DOMAIN};
    server_tokens off;
    
    root /app/owasp_sso;

    ssl_certificate /etc/letsencrypt/live/${DOMAIN}/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/${DOMAIN}/privkey.pem;
    include /etc/nginx/crypto/options-ssl-nginx.conf;
    ssl_dhparam /etc/nginx/crypto/ssl-dhparams.pem;
    
    ssl_client_certificate /etc/nginx/crypto/ca.pem;
    ssl_verify_client optional;
    
    #error_log /var/log/nginx/error.log debug;

    location / {
        try_files $uri $uri/ /index.html;
    }
    
    # Allow cert passthrough FROM a trusted proxy IP (for multiple reverse proxies)
    if ($trustedupstream = 1) {
        set $ssl_client_escaped_cert $http_x_tls_cert;
        set $ssl_client_verify $http_x_tls_verified;
    }
    
    location ^~ /api {
        # Basic proxy setup
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        
        # Client cert passthrough
        proxy_set_header X-TLS-CERT $ssl_client_escaped_cert;
        proxy_set_header X-TLS-VERIFIED $ssl_client_verify;
        
        proxy_ssl_session_reuse on;
        proxy_pass https://backend:3000;
    
        rewrite /api(.*) $1 break;
    }
}