[grade=B] fix(auth): reuse valid session for cross-host SSO

dashcaddy-api/__tests__/sso-handoff-exchange.test.js

@@ -2,14 +2,15 @@ const express = require('express');
 const request = require('supertest');
 const createSsoRouter = require('../routes/auth/sso-gate');
 
-function createApp({ redeem = true } = {}) {
+function createApp({ redeem = true, valid = true } = {}) {
   const app = express();
   const session = {
-    redeemHandoffToken: jest.fn().mockReturnValue(redeem),
+    redeemHandoffToken: jest.fn((token) => (typeof redeem === 'function' ? redeem(token) : redeem)),
     setCookieHostOnly: jest.fn((res) => {
       res.setHeader('Set-Cookie', 'dashcaddy_session=test; Path=/; HttpOnly; Secure; SameSite=Lax');
     }),
-    isValid: jest.fn().mockReturnValue(true),
+    isValid: jest.fn().mockReturnValue(valid),
+    createHandoffToken: jest.fn().mockReturnValue('fresh-sso-handoff-token'),
   };
   const asyncHandler = (fn) => (req, res, next) => Promise.resolve(fn(req, res, next)).catch(next);
   const errorResponse = (res, status, message, extra = {}) => res.status(status).json({ success: false, error: message, ...extra });
@@ -82,3 +83,47 @@ describe('cross-host SSO exchange redirect', () => {
     expect(session.setCookieHostOnly).not.toHaveBeenCalled();
   });
 });
+
+describe('existing-session SSO handoff', () => {
+  test('mints a handoff token without asking for TOTP again', async () => {
+    const { app, session } = createApp();
+    const res = await request(app)
+      .get('/api/v1/auth/sso-handoff')
+      .set('Cookie', 'dashcaddy_session=valid-session');
+
+    expect(res.status).toBe(200);
+    expect(res.body).toMatchObject({ success: true, ssoToken: 'fresh-sso-handoff-token' });
+    expect(session.createHandoffToken).toHaveBeenCalledTimes(1);
+  });
+
+  test('refuses to mint a handoff token without a valid session', async () => {
+    const { app, session } = createApp({ valid: false });
+    const res = await request(app).get('/api/v1/auth/sso-handoff');
+
+    expect(res.status).toBe(401);
+    expect(session.createHandoffToken).not.toHaveBeenCalled();
+  });
+
+  test('completes the full mint, exchange, cookie, redirect lifecycle', async () => {
+    const issued = new Set(['fresh-sso-handoff-token']);
+    const redeemOnce = (token) => issued.delete(token);
+    const { app } = createApp({ redeem: redeemOnce });
+
+    const mint = await request(app)
+      .get('/api/v1/auth/sso-handoff')
+      .set('Cookie', 'dashcaddy_session=valid-session');
+    const exchange = await request(app)
+      .get('/api/v1/auth/sso-exchange')
+      .query({ token: mint.body.ssoToken, return: '/web/' });
+
+    expect(exchange.status).toBe(303);
+    expect(exchange.headers.location).toBe('/web/');
+    expect(exchange.headers['set-cookie'][0]).toContain('dashcaddy_session=');
+    expect(exchange.headers['set-cookie'][0]).not.toMatch(/Domain=/i);
+
+    const replay = await request(app)
+      .get('/api/v1/auth/sso-exchange')
+      .query({ token: mint.body.ssoToken, return: '/web/' });
+    expect(replay.status).toBe(401);
+  });
+});

dashcaddy-api/routes/auth/sso-gate.js

@@ -203,8 +203,22 @@ module.exports = function(deps) {
     }
   }, 'auth-app-token'));
 
+  // A browser that already has a valid status.sami session must not be asked
+  // for TOTP again just because it opened another private-TLD service host.
+  // Mint a fresh one-time token that the target host can exchange for its own
+  // host-only cookie. This route is intentionally session-protected both by
+  // the global middleware and here (defence in depth).
+  router.get('/auth/sso-handoff', (req, res) => {
+    res.setHeader('Cache-Control', 'no-store');
+    if (!session.isValid(req)) {
+      return errorResponse(res, 401, 'Session expired or invalid');
+    }
+    ok(res, { ssoToken: session.createHandoffToken() });
+  });
+
   // Cross-subdomain SSO handoff: exchanges a short-lived single-use token
-  // (minted by /totp/verify) for a HOST-ONLY session cookie on whichever
+  // (minted by /totp/verify or /auth/sso-handoff) for a HOST-ONLY session
+  // cookie on whichever
   // *.sami origin calls this. Needed because Domain=.sami cookies are
   // silently rejected by real browsers (.sami is an unregistered TLD, so
   // browsers treat "sami" as the effective public suffix and refuse to set

status/js/auth-gate.js

@@ -267,6 +267,42 @@
     }
   }
 
+  function buildSsoHandoffTarget(returnUrl, token) {
+    const parsed = new URL(returnUrl, window.location.origin);
+    if (parsed.origin === window.location.origin) return parsed.toString();
+
+    const suffix = SITE.tld.startsWith('.') ? SITE.tld : `.${SITE.tld}`;
+    const isPrivateHost = parsed.hostname === suffix.slice(1) || parsed.hostname.endsWith(suffix);
+    if (parsed.protocol !== 'https:' || !isPrivateHost || !token) return null;
+
+    const returnPath = `${parsed.pathname}${parsed.search}${parsed.hash}`;
+    parsed.pathname = '/dashcaddy-sso';
+    parsed.search = '';
+    parsed.hash = '';
+    parsed.searchParams.set('token', token);
+    parsed.searchParams.set('return', returnPath);
+    return parsed.toString();
+  }
+
+  async function resumeExistingSession(returnUrl) {
+    if (!returnUrl || !isAllowedReturnUrl(returnUrl)) return false;
+    try {
+      const res = await fetch('/api/v1/auth/sso-handoff', {
+        credentials: 'include',
+        cache: 'no-store',
+      });
+      if (!res.ok) return false;
+      const data = await res.json();
+      const target = data.success && buildSsoHandoffTarget(returnUrl, data.ssoToken);
+      if (!target) return false;
+      try { sessionStorage.removeItem('totp_redirect'); } catch (_) {}
+      window.location.replace(target);
+      return true;
+    } catch (_) {
+      return false;
+    }
+  }
+
   const urlParams = new URLSearchParams(window.location.search);
   if (urlParams.get('auth') === 'required') {
     // Preserve the gated service destination so submitTotpCode() can append
@@ -277,8 +313,12 @@
     }
     // Clean URL — happens after we've captured the redirect
     window.history.replaceState({}, '', window.location.pathname);
-    // Show on next tick so the DOM (the .totp-card) is ready
-    setTimeout(show, 0);
+    // Reuse the valid status.sami session first. Only show the TOTP/provider
+    // challenge when that session is genuinely absent or expired.
+    setTimeout(async () => {
+      if (await resumeExistingSession(returnUrl)) return;
+      await show();
+    }, 0);
   }
 
   // Expose for hot-trigger from other modules (e.g. logout)

status/sw.js

@@ -1,4 +1,4 @@
-const CACHE = 'dashcaddy-shell-a24ef15882';
+const CACHE = 'dashcaddy-shell-5dbd809d3b';
 const PRECACHE = [
   '/',
   '/index.html',

status/tests/auth-gate-return-url.test.js

@@ -93,3 +93,41 @@ test('same-origin and tokenless destinations keep their direct URL', () => {
   assert.equal(buildHandoffTarget('/settings', 'one-time'), 'https://status.sami/settings');
   assert.equal(buildHandoffTarget('https://router.sami/config', ''), 'https://router.sami/config');
 });
+
+test('an existing status.sami session returns to a service without another TOTP prompt', async () => {
+  const query = new URLSearchParams({ auth: 'required', return: 'https://plex.sami/web/' });
+  let scheduled;
+  let redirected;
+  const location = {
+    origin: 'https://status.sami',
+    pathname: '/',
+    search: `?${query.toString()}`,
+    replace(value) { redirected = value; },
+  };
+  const context = {
+    URL,
+    URLSearchParams,
+    SITE: { tld: '.sami' },
+    sessionStorage: { setItem() {} },
+    document: { getElementById() { return null; } },
+    setTimeout(fn) { scheduled = fn; },
+    console,
+    fetch: async (url) => {
+      assert.equal(url, '/api/v1/auth/sso-handoff');
+      return { ok: true, json: async () => ({ success: true, ssoToken: 'existing-session-token' }) };
+    },
+    window: {
+      location,
+      history: { replaceState() {} },
+    },
+  };
+  context.window.window = context.window;
+  vm.runInNewContext(source, context, { filename: 'auth-gate.js' });
+
+  assert.equal(typeof scheduled, 'function');
+  await scheduled();
+  assert.equal(
+    redirected,
+    'https://plex.sami/dashcaddy-sso?token=existing-session-token&return=%2Fweb%2F',
+  );
+});