[grade=pending] QA sprint: commit 103 at-risk files from multi-agent sprint work

Committed by Hermes autonomous QA sprint 2026-08-13.
These files were modified during the Aug 12 sprint but never committed.

dashcaddy-api/routes/tailscale.js

@@ -1,6 +1,6 @@
 const express = require('express');
 const fs = require('fs');
-const { TAILSCALE } = require('../src/utilities/constants');
+const { TAILSCALE, REGEX } = require('../src/utilities/constants');
 const { exists } = require('../src/utilities/fs-helpers');
 const { ValidationError, NotFoundError } = require('../src/utilities/errors');
 const { ok, successMessage, unauthorized } = require('../src/utils/responses');
@@ -80,6 +80,17 @@ module.exports = function({
   router.post('/config', asyncHandler(async (req, res) => {
     const { enabled, requireAuth, allowedTailnet } = req.body;
 
+    // Validate allowedTailnet is a safe CIDR/domain string if provided
+    if (typeof allowedTailnet !== 'undefined' && allowedTailnet !== null) {
+      if (typeof allowedTailnet !== 'string' || allowedTailnet.length > 255) {
+        throw new ValidationError('allowedTailnet must be a string (max 255 chars)');
+      }
+      // Block shell metacharacters and path traversal
+      if (/[;&|`$()<>\\]/.test(allowedTailnet)) {
+        throw new ValidationError('allowedTailnet contains invalid characters');
+      }
+    }
+
     if (typeof enabled !== 'undefined') tailscale.config.enabled = enabled;
     if (typeof requireAuth !== 'undefined') tailscale.config.requireAuth = requireAuth;
     if (typeof allowedTailnet !== 'undefined') tailscale.config.allowedTailnet = allowedTailnet;
@@ -150,6 +161,10 @@ module.exports = function({
     if (!subdomain) {
       throw new ValidationError('subdomain is required');
     }
+    // Validate subdomain before it is interpolated into a regex
+    if (!REGEX.SUBDOMAIN.test(subdomain)) {
+      throw new ValidationError('[DC-301] Invalid subdomain format');
+    }
 
     const content = await caddy.read();
     const domain = buildDomain(subdomain);