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security(web): remove creds from image URLs, auth-fail state, tighten CSP

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Minor PR-review follow-ups for the local PWA:
- Macro images load via a header-authenticated fetch -> blob object URL in both
  token and relay modes, so no credential ever sits in an image URL; prior
  object URLs are revoked on re-render.
- Local-mode auth failure now shows a clear "Access token required" state and
  stops the reconnect/toast loop (one-shot), instead of retrying forever.
- CSP connect-src tightened from 'self' ws: wss: to 'self' (same-origin WS is
  covered); verified the live WebSocket still connects.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
MarcoPad Dev
2026-07-17 18:12:23 -07:00
parent 60c3bbcedb
commit 74bd3c2e98
2 changed files with 79 additions and 10 deletions
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web/index.html
+1 -1
View File
@@ -3,7 +3,7 @@
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0, viewport-fit=cover">
<meta http-equiv="Content-Security-Policy" content="default-src 'self'; script-src 'self'; style-src 'self'; img-src 'self' data: blob:; connect-src 'self' ws: wss:; object-src 'none'; base-uri 'none'">
<meta http-equiv="Content-Security-Policy" content="default-src 'self'; script-src 'self'; style-src 'self'; img-src 'self' data: blob:; connect-src 'self'; object-src 'none'; base-uri 'none'">
<meta name="theme-color" content="#15161a" media="(prefers-color-scheme: dark)">
<meta name="theme-color" content="#eceef4" media="(prefers-color-scheme: light)">
<meta name="description" content="Remote macro control for your desktop">
web/js/app.js
+78 -9
View File
@@ -34,6 +34,13 @@ class MacroPadApp {
// Guards against out-of-order macro fetches
this._macroReqId = 0;
// Blob object URLs created for macro images (revoked on re-render)
this._objectUrls = [];
// Set once a local-mode auth failure has been surfaced, to avoid
// reconnect loops and repeated toasts.
this.localAuthFailed = false;
// Macro editor state (null = create mode)
this.editingMacroId = null;
@@ -204,12 +211,44 @@ class MacroPadApp {
}
handleAuthError() {
this.showToast('Authentication failed', 'error');
if (this.relayMode) {
this.showToast('Authentication failed', 'error');
// Clear stored password and redirect to login
sessionStorage.removeItem(`macropad_${this.sessionId}`);
window.location.href = `/${this.sessionId}`;
return;
}
// Local (token) mode: a wrong/missing token makes every request 401 and
// the WebSocket close with 1008, which would otherwise reconnect forever
// and spam toasts. Surface a single, clear message and stop retrying.
if (this.localAuthFailed) return;
this.localAuthFailed = true;
this.shouldReconnect = false;
clearTimeout(this.reconnectTimer);
this.teardownSocket();
this.updateConnectionStatus(false, 'Access denied');
this.renderAuthRequired();
}
renderAuthRequired() {
const container = document.getElementById('macro-grid');
if (!container) return;
container.textContent = '';
const wrap = document.createElement('div');
wrap.className = 'empty-state';
const p1 = document.createElement('p');
p1.textContent = 'Access token required';
const p2 = document.createElement('p');
p2.className = 'hint';
p2.textContent = "Open the link from the desktop app's URL or QR code.";
wrap.append(p1, p2);
container.appendChild(wrap);
}
handleDesktopDisconnected() {
@@ -396,15 +435,38 @@ class MacroPadApp {
macroImageUrl(macro) {
if (!macro.image_path) return null;
const basePath = this.getApiUrl(`/api/image/${macro.image_path}`);
// Credentials go as query params since <img> can't set headers.
// No credential ever goes on the URL; auth is via a header on a
// fetch() below, and the image is shown as a blob object URL.
return this.getApiUrl(`/api/image/${macro.image_path}`);
}
// Auth-only headers (no Content-Type) for GET fetches like images.
getAuthHeaders() {
const headers = {};
if (this.relayMode && this.password) {
return `${basePath}?password=${encodeURIComponent(this.password)}`;
headers['X-MacroPad-Password'] = this.password;
} else if (!this.relayMode && this.localToken) {
headers['X-MacroPad-Token'] = this.localToken;
}
if (!this.relayMode && this.localToken) {
return `${basePath}?token=${encodeURIComponent(this.localToken)}`;
return headers;
}
// Fetch a macro image with the auth header and display it as a blob
// object URL, so no credential is ever placed on an <img> src.
async loadMacroImage(url, img, placeholder) {
try {
const res = await fetch(url, { headers: this.getAuthHeaders() });
if (!res.ok) throw new Error('image request failed');
const blob = await res.blob();
const objectUrl = URL.createObjectURL(blob);
// Track for best-effort revocation on the next render.
this._objectUrls.push(objectUrl);
img.src = objectUrl;
} catch (e) {
// Fall back to the placeholder if the image can't be loaded.
img.style.display = 'none';
placeholder.style.display = '';
}
return basePath;
}
// Rendering (safe DOM construction only - no user value reaches innerHTML)
@@ -430,6 +492,12 @@ class MacroPadApp {
const container = document.getElementById('macro-grid');
if (!container) return;
// Best-effort: revoke object URLs from the previous render to avoid leaks.
if (this._objectUrls && this._objectUrls.length) {
this._objectUrls.forEach((u) => URL.revokeObjectURL(u));
}
this._objectUrls = [];
container.textContent = '';
const macroEntries = Object.entries(this.macros);
@@ -464,14 +532,15 @@ class MacroPadApp {
const img = document.createElement('img');
img.className = 'macro-image';
img.alt = '';
img.src = imageSrc;
placeholder.style.display = 'none';
// Fall back to the placeholder if the image fails to load.
// Fall back to the placeholder if the (blob) image fails to load.
img.addEventListener('error', () => {
img.style.display = 'none';
placeholder.style.display = '';
});
card.appendChild(img);
// Header-authenticated fetch -> blob object URL (no credential on src).
this.loadMacroImage(imageSrc, img, placeholder);
}
card.appendChild(placeholder);