.env.example

@@ -43,3 +43,5 @@ SECURITY_STRICT_LIMIT_REQUEST_COUNT = strict_request_count # default ist 15
 USE_SECURITY_LIMIT = (true|false) # default ist true
 SECURITY_LIMIT_WINDOW = [0-9]*(y|d|h|m|s) # default ist 1m
 SECURITY_LIMIT_REQUEST_COUNT = request_count # default ist 500
+
+TRUST_PROXY = <boolean|number|ip|ip1,ip2,...> # wenn leer, wird dieser Wert nicht angewendet.

package-lock.json

@@ -17,6 +17,7 @@
         "handlebars": "^4.7.8",
         "helmet": "^8.0.0",
         "ics": "^3.8.1",
+        "ip": "^2.0.1",
         "jsonwebtoken": "^9.0.2",
         "lodash.uniqby": "^4.7.0",
         "moment": "^2.30.1",
@@ -41,6 +42,7 @@
       "devDependencies": {
         "@types/cors": "^2.8.14",
         "@types/express": "^4.17.17",
+        "@types/ip": "^1.1.3",
         "@types/jsonwebtoken": "^9.0.6",
         "@types/lodash.uniqby": "^4.7.9",
         "@types/morgan": "^1.9.9",
@@ -535,6 +537,16 @@
       "integrity": "sha512-D0CFMMtydbJAegzOyHjtiKPLlvnm3iTZyZRSZoLq2mRhDdmLfIWOCYPfQJ4cu2erKghU++QvjcUjp/5h7hESpA==",
       "dev": true
     },
+    "node_modules/@types/ip": {
+      "version": "1.1.3",
+      "resolved": "https://registry.npmjs.org/@types/ip/-/ip-1.1.3.tgz",
+      "integrity": "sha512-64waoJgkXFTYnCYDUWgSATJ/dXEBanVkaP5d4Sbk7P6U7cTTMhxVyROTckc6JKdwCrgnAjZMn0k3177aQxtDEA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@types/node": "*"
+      }
+    },
     "node_modules/@types/jsonwebtoken": {
       "version": "9.0.6",
       "resolved": "https://registry.npmjs.org/@types/jsonwebtoken/-/jsonwebtoken-9.0.6.tgz",
@@ -2681,6 +2693,12 @@
       "resolved": "https://registry.npmjs.org/ini/-/ini-1.3.8.tgz",
       "integrity": "sha512-JV/yugV2uzW5iMRSiZAyDtQd+nxtUnjeLt0acNdw98kKLrvuRVyB80tsREOE7yvGVgalhZ6RNXCmEHkUKBKxew=="
     },
+    "node_modules/ip": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/ip/-/ip-2.0.1.tgz",
+      "integrity": "sha512-lJUL9imLTNi1ZfXT+DU6rBBdbiKGBuay9B6xGSPVjUeQwaH1RIGqef8RZkUtHioLmSNpPR5M4HVKJGm1j8FWVQ==",
+      "license": "MIT"
+    },
     "node_modules/ip-address": {
       "version": "9.0.5",
       "resolved": "https://registry.npmjs.org/ip-address/-/ip-address-9.0.5.tgz",

package.json

@@ -32,6 +32,7 @@
     "handlebars": "^4.7.8",
     "helmet": "^8.0.0",
     "ics": "^3.8.1",
+    "ip": "^2.0.1",
     "jsonwebtoken": "^9.0.2",
     "lodash.uniqby": "^4.7.0",
     "moment": "^2.30.1",
@@ -56,6 +57,7 @@
   "devDependencies": {
     "@types/cors": "^2.8.14",
     "@types/express": "^4.17.17",
+    "@types/ip": "^1.1.3",
     "@types/jsonwebtoken": "^9.0.6",
     "@types/lodash.uniqby": "^4.7.9",
     "@types/morgan": "^1.9.9",

src/env.defaults.ts

@@ -1,5 +1,6 @@
 import "dotenv/config";
 import ms from "ms";
+import ip from "ip";
 
 export const DB_TYPE = process.env.DB_TYPE ?? "mysql";
 export const DB_HOST = process.env.DB_HOST ?? "";
@@ -35,6 +36,24 @@ export const USE_SECURITY_LIMIT = process.env.USE_SECURITY_LIMIT ?? "true";
 export const SECURITY_LIMIT_WINDOW = process.env.SECURITY_LIMIT_WINDOW ?? "1m";
 export const SECURITY_LIMIT_REQUEST_COUNT = Number(process.env.SECURITY_LIMIT_REQUEST_COUNT ?? "500");
 
+export const TRUST_PROXY = ((): Array<string> | string | boolean | number | null => {
+  const proxyVal = process.env.TRUST_PROXY;
+  if (!proxyVal) return null;
+  if (proxyVal == "true" || proxyVal == "false") {
+    return proxyVal == "true";
+  }
+  if (!isNaN(Number(proxyVal))) {
+    return Number(proxyVal);
+  }
+  if (proxyVal.includes(",") && proxyVal.split(",").every((pv) => ip.isV4Format(pv) || ip.isV6Format(pv))) {
+    return proxyVal.split(",");
+  }
+  if (ip.isV4Format(proxyVal) || ip.isV6Format(proxyVal)) {
+    return proxyVal;
+  }
+  return null;
+})();
+
 export function configCheck() {
   if (DB_TYPE != "mysql" && DB_TYPE != "sqlite" && DB_TYPE != "postgres")
     throw new Error("set valid value to DB_TYPE (mysql|sqlite|postgres)");
@@ -46,7 +65,7 @@ export function configCheck() {
   if ((DB_PASSWORD == "" || typeof DB_PASSWORD != "string") && DB_TYPE != "sqlite")
     throw new Error("set valid value to DB_PASSWORD");
 
-  if (typeof SERVER_PORT != "number") throw new Error("set valid numeric value to SERVER_PORT");
+  if (isNaN(SERVER_PORT)) throw new Error("set valid numeric value to SERVER_PORT");
 
   if (JWT_SECRET == "" || typeof JWT_SECRET != "string") throw new Error("set valid value to JWT_SECRET");
   checkMS(JWT_EXPIRATION, "JWT_EXPIRATION");
@@ -56,7 +75,7 @@ export function configCheck() {
   if (MAIL_USERNAME == "" || typeof MAIL_USERNAME != "string") throw new Error("set valid value to MAIL_USERNAME");
   if (MAIL_PASSWORD == "" || typeof MAIL_PASSWORD != "string") throw new Error("set valid value to MAIL_PASSWORD");
   if (MAIL_HOST == "" || typeof MAIL_HOST != "string") throw new Error("set valid value to MAIL_HOST");
-  if (typeof MAIL_PORT != "number") throw new Error("set valid numeric value to MAIL_PORT");
+  if (isNaN(MAIL_PORT)) throw new Error("set valid numeric value to MAIL_PORT");
   if (MAIL_SECURE != "true" && MAIL_SECURE != "false") throw new Error("set 'true' or 'false' to MAIL_SECURE");
 
   if (
@@ -73,13 +92,16 @@ export function configCheck() {
   if (USE_SECURITY_STRICT_LIMIT != "true" && USE_SECURITY_STRICT_LIMIT != "false")
     throw new Error("set 'true' or 'false' to USE_SECURITY_STRICT_LIMIT");
   checkMS(SECURITY_STRICT_LIMIT_WINDOW, "SECURITY_STRICT_LIMIT_WINDOW");
-  if (typeof SECURITY_STRICT_LIMIT_REQUEST_COUNT != "number")
+  if (isNaN(SECURITY_STRICT_LIMIT_REQUEST_COUNT))
     throw new Error("set valid numeric value to SECURITY_STRICT_LIMIT_REQUEST_COUNT");
   if (USE_SECURITY_LIMIT != "true" && USE_SECURITY_LIMIT != "false")
     throw new Error("set 'true' or 'false' to USE_SECURITY_LIMIT");
   checkMS(SECURITY_LIMIT_WINDOW, "SECURITY_LIMIT_WINDOW");
-  if (typeof SECURITY_LIMIT_REQUEST_COUNT != "number")
+  if (isNaN(SECURITY_LIMIT_REQUEST_COUNT)) throw new Error("set valid numeric value to SECURITY_LIMIT_REQUEST_COUNT");
-    throw new Error("set valid numeric value to SECURITY_LIMIT_REQUEST_COUNT");
+
+  if (!TRUST_PROXY && process.env.TRUST_PROXY) {
+    throw new Error("set valid boolean, number, ip or ips value to TRUST_PROXY");
+  }
 }
 
 function checkMS(input: string, origin: string) {

src/routes/index.ts

@@ -28,6 +28,7 @@ import {
   SECURITY_LIMIT_WINDOW,
   SECURITY_STRICT_LIMIT_REQUEST_COUNT,
   SECURITY_STRICT_LIMIT_WINDOW,
+  TRUST_PROXY,
   USE_SECURITY_LIMIT,
   USE_SECURITY_STRICT_LIMIT,
 } from "../env.defaults";
@@ -62,6 +63,9 @@ function excludePaths(middleware: RequestHandler, excludedPaths: Array<string>)
 }
 
 export default (app: Express) => {
+  if (TRUST_PROXY) {
+    app.set("trust proxy", TRUST_PROXY);
+  }
   app.set("query parser", "extended");
   app.use(cors());
   app.options("*", cors());