Implementing SSH Server in C#/.Net

Question

A project we're working on just got a new requirement added to it: it has to be able to receive files through SFTP (SSH) using key/pair authentication. We've been able to find an interesting collection of SSH client libraries (such as SSH.Net), but no server ones. The closest we've found so far is a Python library that we're debating implementing through IronPython.

How should we go about doing this? Are we missing any libraries, or should we work on implementing it ourselves?

You don't want to implement one yourself - it's too easy to get the security protocol wrong. OpenSSH itself has had it share of issues: openssh.org/security.html — shf301
– shf301, Commented Jul 12, 2012 at 16:33
We can run a separate SSH server, and that's our fallback at the moment, but it means added complexity to the solution. — Graeme K. Hefner
– Graeme K. Hefner, Commented Jul 12, 2012 at 17:39

Aimeast · Accepted Answer · 2025-02-11 14:43:02Z

6

Also, FxSsh is a pure C# implementing SSH server side. In this stage, supported EXEC method and return stream.

you are welcome Fork and Contribute on https://github.com/Aimeast/FxSsh

Update year 2025:

Now, support rsa-sha2-*, ecdsa-*, ecdh-* algorithms, shell, exec, sftp shells, direct-tcpip, forwarded-tcpip connections.

netcore target: net8.0

edited Feb 11 at 14:43

answered Oct 11, 2016 at 14:40

Aimeast

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Martin Vobr · Accepted Answer · 2022-04-20 12:24:40Z

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Rebex Tiny SFTP Server is a minimalist SFTP server written in C#. You can find sources at https://github.com/rebexnet/RebexTinySftpServer. It depends on a commercial component though.

The list of SFTP server components which will enable you to write your own server application can be found at https://www.sftp.net/server-libraries. I am aware of only two of them: one is from nSoftware (originaly from Eldos) and one from Rebex.

answered Apr 20, 2022 at 12:24

Martin Vobr

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