security: use tls-proxy.js instead of inline node -e in entrypoint.sh

scripts/entrypoint.sh

@@ -2,16 +2,15 @@
 #===
 # wg-easy-ip-tls entrypoint
 # Architecture:
-#  - dumb-init is PID 1 and spawns this script for proper
-#    signal forwarding and zombie reaping
-#  - Nitro (wg-easy) runs on HTTP internally on NITRO_PORT
-#  - If LEGO_ENABLED=true and INSECURE!=true: a Node.js TLS
-#    reverse proxy wraps Nitro on PORT (HTTPS termination)
-#    Certs are loaded at startup; renewed certs are applied
-#    via server.setSecureContext() without restart
-#  - If INSECURE=true: Nitro listens directly on PORT (HTTP)
-#  - A background renewal loop re-runs lego-renew.sh every
-#    LEGO_RENEW_INTERVAL seconds (default: 5 days)
+# - dumb-init is PID 1 and spawns this script for proper
+#   signal forwarding and zombie reaping
+# - Nitro (wg-easy) runs on HTTP internally on NITRO_PORT
+# - If LEGO_ENABLED=true and INSECURE!=true: tls-proxy.js
+#   wraps Nitro on PORT (HTTPS termination)
+#   Certs are hot-reloaded via server.setSecureContext() without restart
+# - If INSECURE=true: Nitro listens directly on PORT (HTTP)
+# - A background renewal loop re-runs lego-renew.sh every
+#   LEGO_RENEW_INTERVAL seconds (default: 5 days)
 #===
 set -eu
 
@@ -79,66 +78,13 @@ if [ "$LEGO_ENABLED" = "true" ] && [ "$INSECURE" != "true" ]; then
   done
 
   echo "[entrypoint] Starting TLS proxy on port $PORT..."
-  # Use setSecureContext for cert hot-reload (works with IP certs - no SNI needed)
-  node -e "
-    const https = require('https');
-    const http = require('http');
-    const net = require('net');
-    const fs = require('fs');
-    const CERT_FILE = '$CERT_FILE';
-    const KEY_FILE = '$KEY_FILE';
-    const NITRO_PORT = $NITRO_PORT;
-    const loadCreds = () => ({
-      cert: fs.readFileSync(CERT_FILE),
-      key: fs.readFileSync(KEY_FILE),
-    });
-    const server = https.createServer(loadCreds(), (req, res) => {
-      const proxy = http.request({
-        hostname: '127.0.0.1',
-        port: NITRO_PORT,
-        path: req.url,
-        method: req.method,
-        headers: req.headers,
-      }, (proxyRes) => {
-        res.writeHead(proxyRes.statusCode, proxyRes.headers);
-        proxyRes.pipe(res);
-      });
-      proxy.on('error', (e) => {
-        console.error('[tls-proxy] error:', e.message);
-        if (!res.headersSent) { res.writeHead(502); }
-        res.end('Bad Gateway');
-      });
-      req.pipe(proxy);
-    });
-    server.on('upgrade', (req, socket, head) => {
-      const conn = net.connect(NITRO_PORT, '127.0.0.1', () => {
-        conn.write('GET ' + req.url + ' HTTP/1.1\\r\\n' +
-          Object.entries(req.headers).map(([k,v]) => k + ': ' + v).join('\\r\\n') +
-          '\\r\\n\\r\\n');
-        if (head && head.length) conn.write(head);
-        socket.pipe(conn);
-        conn.pipe(socket);
-      });
-      conn.on('error', (e) => {
-        console.error('[tls-proxy] ws error:', e.message);
-        socket.destroy();
-      });
-    });
-    // Hot-reload certs when lego-renew.sh updates them
-    fs.watchFile(CERT_FILE, { interval: 60000, persistent: true }, (curr, prev) => {
-      if (curr.mtime !== prev.mtime) {
-        try {
-          server.setSecureContext(loadCreds());
-          console.log('[tls-proxy] Certificate reloaded at ' + curr.mtime.toISOString());
-        } catch (e) {
-          console.error('[tls-proxy] Failed to reload cert:', e.message);
-        }
-      }
-    });
-    server.listen($PORT, '0.0.0.0', () => {
-      console.log('[tls-proxy] HTTPS listening on 0.0.0.0:$PORT -> http://127.0.0.1:$NITRO_PORT');
-    });
-  " &
+  # tls-proxy.js reads cert paths and ports from environment variables
+  # This avoids shell variable interpolation into JavaScript code (injection-safe)
+  CERT_FILE="$CERT_FILE" \
+  KEY_FILE="$KEY_FILE" \
+  NITRO_PORT="$NITRO_PORT" \
+  PORT="$PORT" \
+  node /usr/local/bin/tls-proxy.js &
   echo $! > "$PROXY_PID_FILE"
 else
   # -- HTTP mode (INSECURE=true or LEGO_ENABLED=false) ---