LAN port scan forbidder란 무엇입니까?

LAN port scan forbidder은(는) https://garywill.github.io에 의해 개발된 Chrome 확장 프로그램으로, 주요 기능은 "Forbid non-LAN web to access LAN"입니다.

확장 프로그램 스크린샷

LAN port scan forbidder 확장 프로그램 CRX 파일 다운로드

크롬 확장 프로그램을 crx 형식으로 다운로드하여 브라우저에 수동으로 설치하거나 crx 파일을 친구들과 공유하여 쉽게 크롬 확장 프로그램을 설치하세요.

확장 프로그램 사용 설명서

Forbid untrusted web to scan localhost or LAN.

## Source Code Repo
https://github.com/garywill/LAN-port-scan-forbidder

## What

Webs can try to fetch `127.0.0.1:xxxx` or `192.168.Y.Z:xxxx` to scan your open ports in LAN.

Although browsers have cross-domain protections, webs can't read response contents, **but** can still see the connection succeeds or fails.

There're already reports that some websites using that as tracking fingerprint.

> A web for testing: http://samy.pl/webscan/

## So

Forbid any website behaviors trying to connect to your LAN or localhost, if user is visiting the website via their domains or public IP addresses. (Read the source code `background.js` to see the logic)

> Using JS library [whitequark/ipaddr.js](https://github.com/whitequark/ipaddr.js) (MIT License) v2.0.0 to judge IP range.

### Notification

User can enable notification. When untrusted web tries to access private network and get blocked, will show up notification.

### Fallback operation

If user find a web broken, user can temporary set this addon disabled via toolbar button for:

- this one tab
- this one tab and new tabs opened by this tab
- this one window (Firefox only)
- globally

(above can be set as keyboard shortcuts)

there's showy toolbar button badge indicating disabling status.

## Cases when web LAN scan is properly used

Not all LAN-port-scan are evil.

- Some manufacturers provide web for user's browser to scan LAN for their product that need updating.

- Some softwares use `127.0.0.1` communication to interact between native program and web.

## Disclaimer

This open souce addon comes with no warranty. Use on you own risk!

확장 프로그램 기본 정보

이름	LAN port scan forbidder
ID	lapppchpconamefemlnjdebbcpbncafl
공식 URL	https://chromewebstore.google.com/detail/lan-port-scan-forbidder/lapppchpconamefemlnjdebbcpbncafl
설명	Forbid non-LAN web to access LAN
파일 크기	35.41 KB
설치 횟수	310
현재 버전	0.6.1
최근 업데이트	2023-11-09
출시 날짜	2021-12-25
개발자	https://garywill.github.io
이메일	[email protected]
결제 유형	free
확장 프로그램 웹 사이트	https://github.com/garywill/LAN-port-scan-forbidder
도움말 페이지 URL	https://github.com/garywill/LAN-port-scan-forbidder
개인정보 보호 정책 페이지 URL	https://github.com/garywill/garywill/blob/privacy_policy/README.md
지원되는 언어	en
manifest.json
{ "update_url": "https:\/\/clients2.google.com\/service\/update2\/crx", "name": "LAN port scan forbidder", "description": "Forbid non-LAN web to access LAN", "manifest_version": 2, "version": "0.6.1", "homepage_url": "https:\/\/github.com\/garywill\/LAN-port-scan-forbidder\/", "author": { "name": "Garywill", "url": "https:\/\/garywill.github.io" }, "permissions": [ "webRequest", "webRequestBlocking", ":\/\/\/", "ws:\/\/\/", "wss:\/\/\/", "ftp:\/\/\/*", "contextMenus", "storage" ], "optional_permissions": [ "notifications" ], "icons": { "128": "icon.png" }, "background": { "page": "background.html" }, "browser_action": { "default_icon": "icon_gray.png", "default_title": "LAN port scan forbidder" }, "commands": { "_execute_browser_action": { "description": "Click toolbar button" }, "toggle_t": { "description": "Toggle for one tab" }, "toggle_h": { "description": "Toggle for one tab and new tabs opened by it" }, "toggle_global": { "description": "Toggle globally enable\/disable" } }, "options_ui": { "page": "options.html" } }