tosh - Imagine your SSH server only listens on an IPv6 ad

项目说明

tosh

Imagine your SSH server only listens on an IPv6 address, and where the last 6 digits are changing every 30 seconds as a TOTP code...

Inspired from this tweet (Wayback machine)

Looking for a way simpler, bash implementation? Check out old branch.

Notes

This was made because... I could make it, not if I should make it. Yes, you read it right - it's a toy.
Only use it if you know what you are doing. I am not up to handholding, pre any footguns nor basic support requests.

Its purpose is just to add a layer of obscurity, it's probably only effecti bots (allthough most of them disappear after moving on to IPv6)
and script kiddies. If you're being targeted by e.g go agencies or people who definitely know what they do, then this probably won't help you.

Using this on top of unconfigured (in other words, running stock configuration) SSH server is always a bad idea, so please configure your SSH server
to e.g do only public key authentication, disable login for unnecessary users (e.g allow only members of group canssh to login) etc.

To make things more fun, you may want to adjust your firewall rules to forward to SSH tarpit by default.

Besides that, you NEED to ensure that your server and client times are in sync. You might want to look into chrony.

A few great alternatives to this:

Usage

Assign yourself an IPv6 subnet, replace last 6 hex characters with x.

fd15:4ba5:5a2b:1008:20c:29ff:fe1a:9587 -> fd15:4ba5:5a2b:1008:20c:29ff:fexx:xxxx

Create a base32 TOTP secret, using e.g gen-oath-safe mikroskeem totp

Example setups

Roadmap

FAQ

Why Rust?

I am looking forward to building a cross-platform program easily, which works even on Windows.

Where's client?

Not done yet. Reference implementation will work inside ssh ProxyCommand option.

项目信息

开发语言：Rust

Star 数：421

技术要点

该项目属于CTF思路方向的开源资源，代码结构清晰，适合安全研究人员学习参考。项目围绕Imagine your SSH server only listens on an IPv6 address, and where the last 6 digits are changing every 30 seconds as a TOTP code...展开，提供了可运行的实现，对理解相关安全机制、工具原理与攻防技术具有较高的研究价值。

从技术实现角度看，此类项目的核心在于对底层原理的深入理解与工程化落地。开发者在研究过程中可以结合官方文档与社区讨论，梳理项目的初始化流程、核心模块职责与数据流转，逐步掌握其中的技术细节与设计思路。

使用与学习建议

1. 下载源码压缩包，解压到本地环境。

2. 根据项目类型准备对应的运行环境与依赖。

3. 按照 README 中的步骤完成配置与部署。

4. 在隔离的测试环境中运行验证，避免影响生产系统。

免责声明

本资源来源于开源社区，仅供安全研究、技术学习与合法授权范围内的攻防演练使用，请勿用于任何非法或侵害他人权益的用途。使用本项目产生的一切后果由使用者自行承担。