https://github.com/garywill/LAN-port-scan-forbidder

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garywill / LAN-port-scan-forbidder Public

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Forbid untrusted webs to access localhost or LAN. An anti-scan
protection [?]

garywill.github.io
GPL-2.0 License
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Code

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@garywill
garywill small format fix
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377a210 Jan 15, 2022
small format fix
377a210

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LICENSE
license GPL 2
Aug 13, 2021
README.md
update readme
Jan 15, 2022
background.html
port for Chrome
Jan 3, 2022
background.js
small format fix
Jan 15, 2022
browser-polyfill.min.js
port for Chrome
Jan 3, 2022
common.js
port for Chrome
Jan 3, 2022
icon.png
first release
Aug 13, 2021
icon.svg
first release
Aug 13, 2021
icon_gray.png
png icon
Jan 3, 2022
icon_gray.svg
png icon
Jan 3, 2022
ipaddr.js
readme
Aug 13, 2021
manifest-chrome.json
0.5.0
Jan 15, 2022
manifest.json
0.5.0
Jan 15, 2022
menu.js
add keyboard shortcut support
Jan 15, 2022
off_handler.js
small format fix
Jan 15, 2022
View code
LAN port scan forbidder What So Fallback operation Cases when web LAN
scan is properly used

README.md

 LAN port scan forbidder

Forbid untrusted web to scan localhost or LAN. Browser addon.

  * Firefox Addon
  * Chrome Addon

 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 (MIT License) v2.0.0 to
    judge IP range.

 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.

About

Forbid untrusted webs to access localhost or LAN. An anti-scan
protection [?]

garywill.github.io

Topics

firefox security privacy browser firefox-addon webextension 
firefox-extension browser-extension lan-port-scanner

Resources

Readme

License

GPL-2.0 License

Stars

25 stars

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2 watching

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No releases published

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  * HTML 0.7%

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