This is a small SSH server python implementation.

SSH terminal: working, connection to a a Raspberry Pico W takes 15 seconds. (DH: 5s, Signing with 2048 bit host key: 9s)

Authentication: Only none at the moment

SFTP: not implemented yet

Normal python support: broken

1. Clone this repo
2. Generate a hostkey: ./generateHostKey.sh > hostkey.py
3. Copy the following files to the micropython system:
   • server.py
   • basic_datatypes.py
   • datatypes.py
   • sftp.py
   • hostkey.py

First make sure the micropython system has a working network connection, then run

import server
server.startServer()

This will start a thread in the background listening on port 22.

Micropython must be compiled with MICROPY_PY_UCRYPTOLIB_CTR and MICROPY_PY_OS_DUPTERM (and probably a few other flags).

Like micropython/micropython, this project is licensed under the MIT License.

In addition it has the following non-legally binding clause:

Lars likes beer. If you use this software for practical or educational purposes, like it and meet Lars at a bar/conference/similar; you are not legally bound (but happily encouraged) to offer Lars a beer. :)

The goals of this project are

• to implement a minimal SSH server that can run on micropython
• to provide an easy-to-understand example of how SSH works

The ultimate goal is to provide the same functionality as micropython/webrepl, with an SSH prompt and SFTP file transfer.

The project aims to reach these goals by

• putting references to RFC-sections for all relevant code parts

It is not a goal of this project

• to be fully compliant with all the MUST-clauses of the SSH specification.
• to be general. Supporting a single algorithm is probably good enough.