Comparison of SSH servers
An SSH server is a software program which uses the secure shell protocol to accept connections from remote computers. SFTP/SCP file transfers and remote terminal connections are popular use cases for an SSH server.
General
| Name | Developer | First release date | Last release | Last release date | License |
|---|---|---|---|---|---|
| Apache MINA SSHD | Apache Software Foundation | 2009 | 2.6.0 | 2021-07-01 | Apache License v2 |
| Bitvise SSH Server | Bitvise Limited | 2001 | 8.43 | 2020-06-06[1] | Proprietary, Free for non-commercial use |
| CopSSH | Itefix | 2003-08-12 | 7.4.0 | 2020-10-01[2] | Proprietary |
| CrushFTP Server | CrushFTP, LLC | 2003-01-01 | 9.0.0 | 2018-10-30 | Proprietary, shareware |
| Dropbear | Matt Johnston | 2003-04-06[3] | 2020.81 | 2020-10-29[4] | MIT |
| lsh | Niels Möller | 1999-05-23[5] | 2.1 | 2013-06-26 | GPL |
| OpenSSH (OpenBSD Secure Shell) | The OpenBSD project | 1999-12-01 | 8.4 | 2020-09-27[6] | BSD |
| Teleport | Gravitational | 2016-06-23 | 4.2.9 | 2020-05-05[7] | Apache License v2 |
| wolfSSH | wolfSSL | 2019-10-31 | 1.4.3 | 2019-04-18[8] | GPLv3 or Commercial Distribution |
Platform
The operating systems or virtual machines the SSH servers are designed to run on without emulation; there are several possibilities:
- No indicates that it does not exist or was never released.
- Partial indicates that while it works, the server lacks important functionality compared to versions for other OSs but may still be under development.
- Beta indicates that while a version is fully functional and has been released, it is still in development (e.g. for stability).
- Yes indicates that it has been officially released in a fully functional, stable version.
- Dropped indicates that while the server works, new versions are no longer being released for the indicated OS; the number in parentheses is the last known stable version which was officially released for that OS.
- Included indicates that the server comes pre-packaged with or has been integrated into the operating system.
The list is not exhaustive, but rather reflects the most common platforms today.
| Name | Mac OS X | Mac OS classic | Windows | Cygwin | BSD | Linux | Solaris | Java | OpenVMS | z/OS | AmigaOS | AIX | HPUX | iOS: iPhone,[Note 1] iPod Touch | webOS | Android |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Apache MINA SSHD | Yes | No | Yes | No | Yes | Yes | Yes | Yes | No | No | No | Yes | Yes | No | No | No |
| Bitvise SSH Server | No | No | Yes | No | No | No | No | No | No | No | No | No | No | No | No | No |
| CopSSH | No | No | Yes | Yes | No | No | No | No | No | No | No | No | No | No | No | No |
| CrushFTP Server | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | No | No | No | Yes | Yes | No | No | No |
| Dropbear | Yes | No | No | Yes | Yes | Yes | Yes | No | No | No | No | Yes | Yes | No | Yes[Note 2] | Yes |
| lsh | Yes | No | No | No | Partial[Note 3] | Yes | Yes | No | No | No | No | No | No | No | No | ?? |
| OpenSSH (OpenBSD Secure Shell) | Included | No | Optional[Note 4] | Included | Included | Included[Note 5] | Yes | No | Yes | Yes | Yes | Yes[Note 6] | Included | Yes[Note 7] | Yes[Note 2] | Partial |
| wolfSSH | Yes | No | Yes | Yes | Yes | Yes | Yes | No | No | No | No | ?? | ?? | No | ?? | No |
Features
| Name | SSH1 | SSH2 | Port forwarding | SFTP | SCP | Supports IPv6 | Supports OpenSSH authorized keys | Privilege separation | FIPS 140-2 support |
|---|---|---|---|---|---|---|---|---|---|
| Apache MINA SSHD | No | Yes | Yes | Yes | Yes | Yes | Yes | No | ? |
| Bitvise SSH Server | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| CopSSH | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes[9] | ? |
| CrushFTP Server | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | ? |
| Dropbear | No | Yes | Yes | Partial | Yes | Yes | Yes | No | ? |
| Lsh | No | Yes | Yes | Yes | Yes | ? | ? | ? | ? |
| OpenSSH (OpenBSD Secure Shell) | No[10] | Yes | Yes | Yes | Yes | Yes | Yes | Yes[9] | Yes[Note 8] |
| wolfSSH | No | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes |
Notes
- Unless otherwise noted, iPhone refers to non-jailbroken devices.
- OpenSSH and Dropbear are available as optware packages installed by PreWare (maintained by WebOS Internals)
- Lsh supports only one BSD platform officially, FreeBSD.
- Native OpenSSH for Windows 10 is an optional feature that can be installed. OpenSSH can be installed in windows from windows 10 version 1709 and up. The project is called Win32-OpenSSH (contains 64bit as well), hosted on GitHub.
- Most Linux distributions have OpenSSH as an official package, but a few do not.
- OpenSSH 3.4 was the first release included since AIX
- Only for jailbroken devices.
- OpenSSH server can be built with FIPS 140-2
References
- https://www.bitvise.com/ssh-server-version-history
- "Copssh update - 7.4.0". itefix.net.
- Changes in Dropbear in official web page
- "Index of /dropbear". ucc.asn.au.
- "Listing of /~nisse/archive/". liu.se.
- "OpenSSH 8.4 Release Notes".
- "Github".
- "wolfSSH".
- sshd_config man page on openbsd project 2016-05-18. Retrieved on 2016-05-18.
- OpenSSH 7.5 Release notes, SSHv1 server no longer supported Retrieved on 2017-07-09.
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