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Comparison of SSH servers

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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. This article compares a selection of popular servers.

General

Name Developer Status First release date Last release Last release date License Official web page
Apache Mina SSHD Apache Software Foundation Active 2009 0.13.0 2014-10-30 Apache License v2 Apache Mina SSHD
Reflection for Secure IT Attachmate Active 2005 8.0 2012-11-14 Commercial Attachmate.com
Bitvise SSH Server (formerly WinSSHD) Bitvise, Ltd. Active 2001-05 6.07 2014-05-04[1] Freeware for non commercial use Bitvise SSH Server
CopSSH Itefix Active 2003-08-12 5.0.0 2014-10-09[2] Commercial, Free Edition CopSSH
CrushFTP CrushFTP, LLC Active 2003-01-01 7.0.2 2014-02-06 Commercial, Shareware CrushFTP
Dropbear Matt Johnston Active 2003-04-06[3] 2014.66 2014-10-23[4] MIT Dropbear
freeSSHd SSH Server WEONLYDO Software Active 1.3.0[Note 1] unknown[Note 2] Freeware (source available for purchase) freeSSHd
GoAnywhere Services Linoma Software Active 2009-09-01 3.3.4 2013-09-18 Commercial GoAnywhere Services
KpyM SSH Server KpyM Telnet/SSH Server Active 2002-10 1.19c 2011-01-29 Open Source BSD KpyM SSH Server
lsh Niels Möller Active 1999-05-23[5] 2.9-exp 2007-04-04 GPL LSH
Maverick SSHD SSHTOOLS Limited Active 2004 1.6.9 2015-01-12 Commercial Maverick SSHD
MobaSSH SSH Server Mobatek Active 1.22 Freeware for non commercial use MobaSSH SSH Server
OpenSSH The OpenBSD project Active 1999-12-01 6.6 2014-03-16[6] BSD OpenSSH
Pragma Fortress SSH Server Pragma Systems, Inc. Active 2004-05-24 5.0 2011-04-20[7] Commercial SSH SFTP Server for Windows
Tectia SSH Server SSH Communications Security (formerly Tectia) Active 1995-07 6.4.8 2014-10-28 Commercial SSH.com
PowerShell Server /n software Active 6.0.4798 [8] 2013-02-19 Commercial, Free Personal Edition PowerShell Server
SilverSHielD Extenua, Inc. Active 2008-10 6.0.25.125 2013-12-04[9] Free for personal use SilverSHielD
Georgia SoftWorks SSH Server Georgia SoftWorks Active 2004-07 8.05.0031 2014-10-24 Commercial Georgia SoftWorks
Syncplify.me Server! Syncplify, Inc. Active 2014-02 3.0.2.32 2014-10-05[10] Free for personal use Syncplify.me Server!
TinySSH Jan Mojžíš Active 2014-02-16 20150101 2015-01-01 Public Domain TinySSH

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 3] iPod Touch webOS Android
Apache Mina SSHD Yes No Yes No Yes Yes Yes Yes No No No Yes Yes No No No
Reflection for Secure IT No No Yes No No Yes Yes No 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 No Yes No No No No No No No No No No No No
CrushFTP 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 4] Yes
freeSSHd No No Yes No No No No No No No No No No No No No
KpyM SSH Server No No Yes No No No No No No No No No No No No No
GoAnywhere Services Yes Yes Yes No Yes Yes Yes Yes No No No Yes Yes No No Yes
lsh Yes No No No Partial[Note 5] Yes Yes No No No No No No No No ??
Maverick SSHD Yes No Yes No Yes Yes Yes Yes No No No Yes Yes No No Yes
MobaSSH SSH Server No No Yes Yes No No No No No No No No No No No No
OpenSSH Included No No Included Included Included [Note 6] Yes No Yes Yes Yes Yes[Note 7] Included Yes[Note 8] Yes[Note 4] Partial
Pragma Fortress SSH Server No No Yes No No No No No No No No No No No No ??
Tectia SSH Server No No Yes No No Yes Yes No No Yes No Yes Yes No No ??
PowerShell Server No No Yes No No No No No No No No No No No No No
SilverSHielD No No Yes No No No No No No No No No No No No No
Georgia SoftWorks SSH Server No No Yes No No No No No No No No No No No No No
Syncplify.me Server! No No Yes No No No No No No No No No No No No No
TinySSH Yes No No No Yes Yes Yes No No No No Yes Yes No No No

Features

Name SSH1 SSH2 Port forwarding SFTP SCP Supports IPv6 Supports OpenSSH authorized keys Privilege separation
Apache Mina SSHD No Yes Yes Yes Yes Yes Yes No
Reflection for Secure IT No Yes Yes Yes Yes Yes Yes Yes
Bitvise SSH Server No Yes Yes Yes Yes Yes Yes Yes
CopSSH Yes Yes Yes Yes Yes Yes Yes Yes[11]
CrushFTP No Yes Yes Yes Yes Yes Yes Yes
Dropbear No Yes Yes No Yes Yes Yes No
KpyM SSH Server Yes Yes Yes Yes No Yes Yes Yes
GoAnywhere Services Yes Yes Yes Yes Yes Yes Yes Yes
Lsh No Yes Yes Yes Yes ? ? ?
Maverick SSHD No Yes Yes Yes Yes Yes Yes No
MobaSSH SSH Server Yes Yes Yes Yes Yes Yes Yes Yes
OpenSSH Yes Yes Yes Yes Yes Yes Yes Yes[12]
Pragma Fortress SSH Server Yes Yes Yes Yes Yes Yes Yes Yes
Tectia SSH Server No Yes Yes Yes Yes Yes Yes Partial[Note 9]
SilverSHielD No Yes Yes Yes No No Yes No
Georgia SoftWorks SSH Server No Yes Yes No No Yes No Yes
Syncplify.me Server! No Yes Yes Yes No Yes Yes Yes
TinySSH No Yes No No No Yes Partial[Note 10] Partial[Note 11]

See also

Notes

  1. ^ An authentication bypass vulnerability (CVE-2012-6066) was present in versions 1.2.6 and earlier of FreeSSHd. It is not known if or when this vulnerability was fixed, as no public statement about it from the developers could be found. The security of the current version is therefore unknown.
  2. ^ Announcements or release notes showing a date when 1.3.0 was released could not be found, but it was likely in 2014.
  3. ^ Unless otherwise noted, iPhone refers to non-jailbroken devices.
  4. ^ a b OpenSSH and Dropbear are available as optware packages installed by PreWare (maintained by WebOS Internals)
  5. ^ Lsh supports only one BSD platform officially, FreeBSD.[citation needed]
  6. ^ Most Linux distributions have OpenSSH as an official package, but a few do not.
  7. ^ Openssh 3.4 was the first release included since AIX
  8. ^ Only for jailbroken devices.
  9. ^ Different exploit protection mechanism in use
  10. ^ TinySSH accepts only keys from authorized_keys file, options not supported
  11. ^ TinySSH has similar protection mechanism

References

  1. ^ Bitvise SSH Server Version History
  2. ^ [1]
  3. ^ Changes in Dropbear in official web page
  4. ^ [2]
  5. ^ Archive of lsh releases in official web page
  6. ^ OpenBSD changes in official web page
  7. ^ [3]
  8. ^ [4]
  9. ^ SilverSHielD Release Notes
  10. ^ Syncplify.me Server! Release Notes
  11. ^ sshd_config(5) manual page 2008-04-05. Retrieved on 2008-04-27.
  12. ^ sshd_config(5) manual page 2008-04-05. Retrieved on 2008-04-27.
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