feat: add HAproxy config with TLS, HTTP/2, rate limiting, and gzip

haproxy/haproxy.cfg

@@ -0,0 +1,49 @@
+global
+    log stderr local0 err
+    maxconn 4096
+    # Performance tuning
+    tune.ssl.default-dh-param 2048
+    ssl-default-bind-ciphersuites TLS_AES_128_GCM_SHA256:TLS_AES_256_GCM_SHA384:TLS_CHACHA20_POLY1305_SHA256
+    ssl-default-bind-options prefer-client-ciphers no-sslv3 no-tlsv10 no-tlsv11
+
+defaults
+    log     global
+    mode    http
+    option  httplog
+    option  dontlognormal
+    timeout connect 5s
+    timeout client  30s
+    timeout server  30s
+    timeout http-request 10s
+    timeout http-keep-alive 5s
+
+frontend https_in
+    bind *:443 ssl crt /etc/haproxy/certs/origin.pem alpn h2,http/1.1
+
+    # Gzip compression
+    compression algo gzip
+    compression type text/html text/plain application/json text/css
+
+    # Access to port 443 is already restricted to Cloudflare IPs at the UFW level
+    # Therefore, all requests reaching HAProxy come from Cloudflare; no additional ACL validation is required.
+
+    # HAProxy's own forwardfor must be disabled, otherwise it will insert Cloudflare node IPs
+    no option forwardfor
+
+    # Overwrite standard headers directly with the real IP forcibly added by Cloudflare
+    http-request set-header X-Forwarded-For %[req.hdr(CF-Connecting-IP)]
+    http-request set-header X-Real-IP      %[req.hdr(CF-Connecting-IP)]
+
+    # Rate limiting: 30 requests per minute per IP (based on CF-Connecting-IP)
+    stick-table type string len 45 size 100k expire 1m store http_req_rate(1m)
+    http-request track-sc0 req.hdr(CF-Connecting-IP)
+    http-request deny deny_status 429 if { sc_http_req_rate(0) gt 30 }
+
+    # Block /health from external access
+    acl is_health path /health
+    http-request deny deny_status 403 if is_health
+
+    default_backend app
+
+backend app
+    server rustyip app:3000 check