snapshot of https://github.com/toeverything/AFFiNE.git (canary, 2026-09-16; blobs > 131072B omitted)

packages/frontend/apps/electron/src/main/security/url-safety.ts

@@ -0,0 +1,117 @@
+import * as dns from 'node:dns/promises';
+import { BlockList, isIP } from 'node:net';
+
+const ALLOWED_PROTOCOLS = new Set(['http:', 'https:']);
+const BLOCKED_IPS = new BlockList();
+const ALLOWED_IPV6 = new BlockList();
+
+function stripZoneId(address: string) {
+  const idx = address.indexOf('%');
+  return idx === -1 ? address : address.slice(0, idx);
+}
+
+// Use Node's built-in BlockList (Electron 39 ships with Node 22.x).
+for (const [network, prefix] of [
+  ['0.0.0.0', 8],
+  ['10.0.0.0', 8],
+  ['127.0.0.0', 8],
+  ['169.254.0.0', 16],
+  ['172.16.0.0', 12],
+  ['192.168.0.0', 16],
+  ['100.64.0.0', 10], // CGNAT
+  ['224.0.0.0', 4], // multicast
+  ['240.0.0.0', 4], // reserved (includes broadcast)
+] as const) {
+  BLOCKED_IPS.addSubnet(network, prefix, 'ipv4');
+}
+
+BLOCKED_IPS.addAddress('::', 'ipv6');
+BLOCKED_IPS.addAddress('::1', 'ipv6');
+BLOCKED_IPS.addSubnet('ff00::', 8, 'ipv6'); // multicast
+BLOCKED_IPS.addSubnet('fc00::', 7, 'ipv6'); // unique local
+BLOCKED_IPS.addSubnet('fe80::', 10, 'ipv6'); // link-local
+ALLOWED_IPV6.addSubnet('2000::', 3, 'ipv6'); // global unicast
+
+function extractEmbeddedIPv4FromIPv6(address: string): string | null {
+  if (!address.includes('.')) {
+    return null;
+  }
+  const idx = address.lastIndexOf(':');
+  if (idx === -1) {
+    return null;
+  }
+  const tail = address.slice(idx + 1);
+  return isIP(tail) === 4 ? tail : null;
+}
+
+function isBlockedIpAddress(address: string): boolean {
+  const ip = stripZoneId(address);
+  const family = isIP(ip);
+  if (family === 4) {
+    return BLOCKED_IPS.check(ip, 'ipv4');
+  }
+  if (family === 6) {
+    const embeddedV4 = extractEmbeddedIPv4FromIPv6(ip);
+    if (embeddedV4) {
+      return isBlockedIpAddress(embeddedV4);
+    }
+    if (!ALLOWED_IPV6.check(ip, 'ipv6')) {
+      return true;
+    }
+    return BLOCKED_IPS.check(ip, 'ipv6');
+  }
+  return true;
+}
+
+async function resolveHostAddresses(hostname: string): Promise<string[]> {
+  const lowered = hostname.toLowerCase();
+  if (lowered === 'localhost' || lowered.endsWith('.localhost')) {
+    return ['127.0.0.1', '::1'];
+  }
+
+  const results = await dns.lookup(hostname, { all: true, verbatim: true });
+  return results.map(r => r.address);
+}
+
+export async function resolveAndValidateUrlForPreview(
+  rawUrl: string
+): Promise<{ url: URL; address: string }> {
+  let url: URL;
+  try {
+    url = new URL(rawUrl);
+  } catch {
+    throw new Error('Invalid URL');
+  }
+
+  if (!ALLOWED_PROTOCOLS.has(url.protocol)) {
+    throw new Error('Disallowed URL protocol');
+  }
+
+  if (url.username || url.password) {
+    throw new Error('URL must not include credentials');
+  }
+
+  if (!url.hostname) {
+    throw new Error('Missing hostname');
+  }
+
+  if (isIP(url.hostname)) {
+    if (isBlockedIpAddress(url.hostname)) {
+      throw new Error('Blocked IP address');
+    }
+    return { url, address: url.hostname };
+  }
+
+  const addresses = await resolveHostAddresses(url.hostname);
+  if (!addresses.length) {
+    throw new Error('Unresolvable hostname');
+  }
+
+  for (const addr of addresses) {
+    if (isBlockedIpAddress(addr)) {
+      throw new Error('Blocked IP address');
+    }
+  }
+
+  return { url, address: addresses[0] };
+}