security: enforce nonce based content policy

2026-09-13 16:38:47 +07:00
parent 1305cccfa5
commit 86ed3a966a
8 changed files with 68 additions and 11 deletions
@@ -39,6 +39,43 @@ const jsonLd = JSON.stringify({
  "@context": "https://schema.org",
  "@graph": jsonLdGraph,
 }).replaceAll("<", "\\u003c");
+const configuredFilesDomain = process.env.FILES_DOMAIN || "files.rf4spotter.ru";
+const filesDomain = /^(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?)(?:\.[a-z0-9](?:[a-z0-9-]*[a-z0-9])?)+$/i.test(configuredFilesDomain)
+  ? configuredFilesDomain
+  : "files.rf4spotter.ru";
+const isLoopback = (hostname: string) => hostname === "localhost" || hostname === "127.0.0.1" || hostname === "[::1]";
+const safeOrigin = (value: string | undefined, fallback: string) => {
+  try {
+    const url = new URL(value || fallback);
+    return url.protocol === "https:" || (url.protocol === "http:" && isLoopback(url.hostname)) ? url.origin : fallback;
+  } catch {
+    return fallback;
+  }
+};
+const apiOrigin = safeOrigin(import.meta.env.PUBLIC_API_URL, siteUrl);
+const filesFallback = `https://${filesDomain}`;
+const filesOrigin = (() => {
+  try {
+    const url = new URL(process.env.FILES_ORIGIN || filesFallback);
+    if ((url.protocol === "https:" && url.hostname === filesDomain) || (url.protocol === "http:" && isLoopback(url.hostname))) {
+      return url.origin;
+    }
+  } catch {
+    // Invalid deployment input falls back to the validated production hostname.
+  }
+  return filesFallback;
+})();
+const localOrigins = [apiOrigin, filesOrigin].filter((origin) => origin.startsWith("http://"));
+const cspNonce = crypto.randomUUID().replaceAll("-", "");
+Astro.response.headers.set("Content-Security-Policy", [
+  "default-src 'self'", "base-uri 'self'", "object-src 'none'", "frame-ancestors 'none'",
+  "form-action 'self'", `connect-src 'self'${apiOrigin === siteUrl ? "" : ` ${apiOrigin}`}`,
+  `img-src 'self' data: ${filesOrigin}`,
+  "font-src 'self'", "media-src 'self'", "manifest-src 'self'",
+  `script-src 'self' 'nonce-${cspNonce}'`, "script-src-attr 'none'",
+  "style-src 'self'", "style-src-attr 'none'",
+  ...(localOrigins.length ? [] : ["upgrade-insecure-requests"]),
+].join("; "));
 ---
 <!doctype html>
 <html lang="ru" data-theme={theme === "system" ? undefined : theme}>
@@ -70,7 +107,7 @@ const jsonLd = JSON.stringify({
    <meta name="twitter:description" content={description} />
    <meta name="twitter:image" content={socialImage} />
    <meta name="twitter:image:alt" content="Лаймовый поплавок на тёмном озере с координатной сеткой" />
-    <script type="application/ld+json" set:html={jsonLd} is:inline />
+    <script type="application/ld+json" nonce={cspNonce} set:html={jsonLd} is:inline />
    <title>{title}</title>
  </head>
  <body>