Harden app for release readiness

.gitea/workflows/build-windows.yml

@@ -42,6 +42,9 @@ jobs:
       - name: Install dependencies
         run: npm install
 
+      - name: Audit production dependencies
+        run: npm audit --omit=dev --audit-level=high
+
       - name: Build Windows installer
         run: npm run dist:win
 
@@ -58,7 +61,8 @@ jobs:
       - name: Publish to Gitea package registry
         shell: bash
         run: |
-          package_version="$(node -p "require('./package.json').version")-${GITHUB_SHA::7}"
+          app_version="$(node -p "require('./package.json').version")"
+          package_version="${app_version}-${GITHUB_SHA::7}"
 
           for artifact in release/*; do
             [ -f "$artifact" ] || continue
@@ -68,3 +72,18 @@ jobs:
               --upload-file "$artifact" \
               "https://git.wilkensxl.de/api/packages/MrSphay/generic/envhelper/${package_version}/${file_name}"
           done
+
+          latest_url="https://git.wilkensxl.de/api/packages/MrSphay/generic/envhelper/latest"
+          curl --silent --show-error --user "MrSphay:${REGISTRY_TOKEN}" --request DELETE "${latest_url}" || true
+
+          mkdir -p package-latest
+          cp "release/EnvHelper-${app_version}-setup-x64.exe" "package-latest/EnvHelper-setup-x64.exe"
+          cp "release/EnvHelper-${app_version}-portable-x64.exe" "package-latest/EnvHelper-portable-x64.exe"
+
+          for artifact in package-latest/*; do
+            file_name="$(basename "$artifact")"
+            curl --fail-with-body \
+              --user "MrSphay:${REGISTRY_TOKEN}" \
+              --upload-file "$artifact" \
+              "${latest_url}/${file_name}"
+          done

README.md

@@ -152,14 +152,23 @@ Manual defaults can always be added. They override automatically detected defaul
 
 ## Downloads and Artifacts
 
-The Windows build produces two executable artifacts:
+The current Windows build can be downloaded directly from the Gitea Generic Package registry:
+
+| Variant | Download |
+| --- | --- |
+| Installer | [EnvHelper-setup-x64.exe](https://git.wilkensxl.de/api/packages/MrSphay/generic/envhelper/latest/EnvHelper-setup-x64.exe) |
+| Portable | [EnvHelper-portable-x64.exe](https://git.wilkensxl.de/api/packages/MrSphay/generic/envhelper/latest/EnvHelper-portable-x64.exe) |
+
+Private package downloads may require an active Gitea session or a token with package read access.
+
+Each build also produces versioned executable artifacts:
 
 ```text
 EnvHelper-0.1.0-setup-x64.exe
 EnvHelper-0.1.0-portable-x64.exe
 ```
 
-The files are published by the Gitea Runner as an Actions artifact and as a Generic Package.
+The files are published by the Gitea Runner as an Actions artifact, as an immutable `version-sha` Generic Package, and as the moving `latest` Generic Package used by the links above.
 
 <p align="center"><img src="https://raw.githubusercontent.com/andreasbm/readme/master/assets/lines/rainbow.png" alt="-----------------------------------------------------" width="100%"></p>
 
@@ -237,6 +246,18 @@ The generated output is committed as `README.md` so Gitea can render it directly
 
 EnvHelper generates values locally in the renderer using Web Crypto. It is a helper for `.env` templates and is not a replacement for a central secret manager in production infrastructure.
 
+Security posture:
+
+| Area | State |
+| --- | --- |
+| Secret generation | Uses `crypto.getRandomValues` and `crypto.randomUUID` |
+| Renderer isolation | Electron `contextIsolation` and sandbox are enabled |
+| Node access | `nodeIntegration` is disabled in the renderer |
+| Navigation | New windows and renderer navigation are blocked |
+| Content policy | The app ships with a restrictive Content Security Policy |
+| Default storage | Sensitive manual defaults such as passwords, tokens, and API keys are not persisted |
+| External services | No `.env` input or generated secret is sent to external services |
+
 ### Windows Defender and SmartScreen
 
 Windows may block or delay apps from unknown publishers. This is usually caused by missing reputation or by the absence of a trusted code-signing certificate.

blueprint.md

@@ -121,14 +121,23 @@ Manual defaults can always be added. They override automatically detected defaul
 {{ template:section-line }}
 ## Downloads and Artifacts
 
-The Windows build produces two executable artifacts:
+The current Windows build can be downloaded directly from the Gitea Generic Package registry:
+
+| Variant | Download |
+| --- | --- |
+| Installer | [EnvHelper-setup-x64.exe](https://git.wilkensxl.de/api/packages/MrSphay/generic/envhelper/latest/EnvHelper-setup-x64.exe) |
+| Portable | [EnvHelper-portable-x64.exe](https://git.wilkensxl.de/api/packages/MrSphay/generic/envhelper/latest/EnvHelper-portable-x64.exe) |
+
+Private package downloads may require an active Gitea session or a token with package read access.
+
+Each build also produces versioned executable artifacts:
 
 ```text
 EnvHelper-0.1.0-setup-x64.exe
 EnvHelper-0.1.0-portable-x64.exe
 ```
 
-The files are published by the Gitea Runner as an Actions artifact and as a Generic Package.
+The files are published by the Gitea Runner as an Actions artifact, as an immutable `version-sha` Generic Package, and as the moving `latest` Generic Package used by the links above.
 
 {{ template:section-line }}
 ## Development
@@ -202,6 +211,18 @@ The generated output is committed as `README.md` so Gitea can render it directly
 
 EnvHelper generates values locally in the renderer using Web Crypto. It is a helper for `.env` templates and is not a replacement for a central secret manager in production infrastructure.
 
+Security posture:
+
+| Area | State |
+| --- | --- |
+| Secret generation | Uses `crypto.getRandomValues` and `crypto.randomUUID` |
+| Renderer isolation | Electron `contextIsolation` and sandbox are enabled |
+| Node access | `nodeIntegration` is disabled in the renderer |
+| Navigation | New windows and renderer navigation are blocked |
+| Content policy | The app ships with a restrictive Content Security Policy |
+| Default storage | Sensitive manual defaults such as passwords, tokens, and API keys are not persisted |
+| External services | No `.env` input or generated secret is sent to external services |
+
 ### Windows Defender and SmartScreen
 
 Windows may block or delay apps from unknown publishers. This is usually caused by missing reputation or by the absence of a trusted code-signing certificate.

electron/main.ts

@@ -6,6 +6,8 @@ import { fileURLToPath } from "node:url";
 
 const __dirname = path.dirname(fileURLToPath(import.meta.url));
 
+app.setAppUserModelId("de.wilkensxl.envhelper");
+
 async function createWindow() {
   const win = new BrowserWindow({
     width: 1220,
@@ -19,11 +21,24 @@ async function createWindow() {
     webPreferences: {
       preload: path.join(__dirname, "preload.js"),
       contextIsolation: true,
-      nodeIntegration: false
+      nodeIntegration: false,
+      sandbox: true,
+      webSecurity: true,
+      allowRunningInsecureContent: false,
+      devTools: !app.isPackaged
     }
   });
 
   Menu.setApplicationMenu(null);
+  win.webContents.setWindowOpenHandler(() => ({ action: "deny" }));
+  win.webContents.on("will-navigate", (event, url) => {
+    const currentUrl = win.webContents.getURL();
+    if (!currentUrl || url === currentUrl || (!app.isPackaged && url.startsWith("http://127.0.0.1:5173"))) {
+      return;
+    }
+
+    event.preventDefault();
+  });
 
   if (!app.isPackaged) {
     await win.loadURL("http://127.0.0.1:5173");
@@ -56,6 +71,10 @@ ipcMain.handle("envhelper:open-file", async (event) => {
 });
 
 ipcMain.handle("envhelper:save-file", async (event, content: string) => {
+  if (typeof content !== "string") {
+    throw new TypeError("Save content must be a string.");
+  }
+
   const owner = BrowserWindow.fromWebContents(event.sender);
   const options = {
     defaultPath: ".env",

index.html

@@ -1,7 +1,11 @@
 <!doctype html>
-<html lang="de">
+<html lang="en">
   <head>
     <meta charset="UTF-8" />
+    <meta
+      http-equiv="Content-Security-Policy"
+      content="default-src 'self'; script-src 'self'; style-src 'self' 'unsafe-inline'; img-src 'self' data:; connect-src 'self' http://127.0.0.1:* ws://127.0.0.1:*; object-src 'none'; base-uri 'none'; form-action 'none'"
+    />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
     <title>EnvHelper</title>
   </head>

src/App.tsx

@@ -260,12 +260,17 @@ function readDefaults(): EnvDefault[] {
 
   try {
     const parsed = JSON.parse(stored) as EnvDefault[];
-    return Array.isArray(parsed) ? parsed : initialDefaults;
+    return Array.isArray(parsed) ? parsed.filter((entry) => entry.key && typeof entry.value === "string" && canPersistDefault(entry.key)) : initialDefaults;
   } catch {
     return initialDefaults;
   }
 }
 
+function canPersistDefault(key: string): boolean {
+  const signal = normalizeKey(key);
+  return !["PASSWORD", "SECRET", "TOKEN", "PRIVATE_KEY", "API_KEY", "ACCESS_KEY"].some((marker) => signal.includes(marker));
+}
+
 function readIgnoredAutoDefaults(): string[] {
   const stored = localStorage.getItem("envhelper-ignored-auto-defaults");
   if (!stored) {
@@ -518,7 +523,7 @@ export default function App() {
   }, [language]);
 
   useEffect(() => {
-    localStorage.setItem("envhelper-defaults", JSON.stringify(manualDefaults));
+    localStorage.setItem("envhelper-defaults", JSON.stringify(manualDefaults.filter((entry) => canPersistDefault(entry.key))));
   }, [manualDefaults]);
 
   useEffect(() => {

src/env.ts

@@ -359,13 +359,28 @@ function randomBytes(length: number): Uint8Array {
 function randomInteger(min: number, max: number): number {
   const range = max - min + 1;
   const array = new Uint32Array(1);
-  crypto.getRandomValues(array);
+  const limit = Math.floor(0x100000000 / range) * range;
+
+  do {
+    crypto.getRandomValues(array);
+  } while (array[0] >= limit);
+
   return min + (array[0] % range);
 }
 
 function randomString(length: number, alphabet: string): string {
-  const bytes = randomBytes(length);
-  return [...bytes].map((byte) => alphabet[byte % alphabet.length]).join("");
+  let value = "";
+  const limit = Math.floor(256 / alphabet.length) * alphabet.length;
+
+  while (value.length < length) {
+    for (const byte of randomBytes(length - value.length)) {
+      if (byte < limit) {
+        value += alphabet[byte % alphabet.length];
+      }
+    }
+  }
+
+  return value;
 }
 
 function bytesToBase64(bytes: Uint8Array): string {