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fix(browse): document CDP debug port security + log Chrome version on v20 fallback

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Follow-up to #892 per Codex outside-voice review. Two small additions to the
Windows v20 App-Bound Encryption CDP fallback:

1. Inline comment documenting the deliberate security posture of the
   --remote-debugging-port. Chrome binds it to 127.0.0.1 by default, so the
   threat model is local-user-only (which is no worse than baseline — local
   attackers can already read the cookie DB). Random port 9222-9321 is for
   collision avoidance, not security. Chrome is always killed in finally.

2. One-time Chrome version log on CDP entry via /json/version. When Chrome
   inevitably changes v20 key format or /json/list shape in a future major
   version, logs will show exactly which version users are hitting.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
This commit is contained in:
Garry Tan
2026-04-17 06:05:09 +08:00
parent 9df28bf631
commit ea73027e28
1 changed files with 27 additions and 1 deletions
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browse/src/cookie-import-browser.ts
+27 -1
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@@ -827,7 +827,21 @@ export async function importCookiesViaCdp(
if (!dataDir) throw new CookieImportError(`No Windows data dir for ${browser.name}`, 'not_installed');
const userDataDir = path.join(getBaseDir('win32'), dataDir);
// Launch Chrome headless with remote debugging on the real profile
// Launch Chrome headless with remote debugging on the real profile.
//
// Security posture of the debug port:
// - Chrome binds --remote-debugging-port to 127.0.0.1 by default. We rely
// on that — the port is NOT exposed to the network. Any local process
// running as the same user could connect and read cookies, but if an
// attacker already has local-user access they can read the cookie DB
// directly. Threat model: no worse than baseline.
// - Port is randomized in [9222, 9321] to avoid collisions with other
// Chrome-based tools the user may have open. Not cryptographic.
// - Chrome is always killed in the finally block below (even on crash).
//
// Debugging note: if this path starts failing after a Chrome update,
// check the Chrome version logged below — Chrome's ABE key format (v20)
// or /json/list shape can change between major versions.
const debugPort = 9222 + Math.floor(Math.random() * 100);
const chromeProc = Bun.spawn([
exePath,
@@ -847,8 +861,20 @@ export async function importCookiesViaCdp(
// Network.getAllCookies is only available on page targets, not browser.
let wsUrl: string | null = null;
const startTime = Date.now();
let loggedVersion = false;
while (Date.now() - startTime < 15_000) {
try {
// One-time version log for future diagnostics when Chrome changes v20 format.
if (!loggedVersion) {
try {
const versionResp = await fetch(`http://127.0.0.1:${debugPort}/json/version`);
if (versionResp.ok) {
const v = await versionResp.json() as { Browser?: string };
console.log(`[cookie-import] CDP fallback: ${browser.name} ${v.Browser || 'unknown version'}`);
loggedVersion = true;
}
} catch {}
}
const resp = await fetch(`http://127.0.0.1:${debugPort}/json/list`);
if (resp.ok) {
const targets = await resp.json() as Array<{ type: string; webSocketDebuggerUrl?: string }>;