Free ssh software for linux

KSSH is a KDE front-end to ssh.

It can work as a standard KDE application that launches ssh connections in a terminal or as a konsole session.

This means that you can press in any konsole "New Session" and then select "Secure Shell".

yaSSH project is a fast, dual-licensed implementation of SSH.
It will include an SSH client, a client library, a server, and a server library.
It is focused on speed, limited memory requirements, a simple API, portability, and use in an embedded setting.
Enhancements:
- This release contains client transport support and initial client authentication.

SSH Rootkit is a patch for latest version of SSH 1.2 to enable "rootkit" features like incoming/outgoing password logging, "global password" to allow login into any account using a pre-defined password.
Adds options to SSH configure script to enable rootkit features. Script kiddie dream!
WARNING: If configure fails on your system for some reason, re-run autoheader / autoconf in the ssh dir after patching.
WARNING! WARNING! WARNING! WARNING! WARNING! WARNING! WARNING! WARNING!
PLEASE READ THE SECTION ABOUT SETTING FILE MODES FOR THE
USERNAME/PASSWORD LOG FILE!!! IF YOU DONT, SSH ROOTKIT
WILL NOT WORK!!! IF I GET ANY EMAIL ABOUT "SIGNAL 11"
WHEN RUNNING SSH, I WILL IGNORE IT!
WARNING! WARNING! WARNING! WARNING! WARNING! WARNING! WARNING! WARNING!
NOTICE: This version includes patches from these people: Zelea, spwn.
NOTICE: Setting file modes on the logfile PLEASE make sure that your selected log file (--enable-ssh-log=whatever) is set to mode 666 (read/write by all) its extremely important to do this, because otherwise ssh will not be able to fopen() the log file, and will die with sig11. No, there is not an easy way to make it open the file while its still root. So, to summarize this:
# chmod 666 /wherever/your/log/file/is/.logfile
If you dont do this, dont come crying to me after the admin finds you.
Enhancements:
- now uses configure options to enable rootkit features
- NEW logging facility, save incoming AND outgoing logins into a file, outgoing logins are saved with [successful] or [failed] message, great incase the user types some -other- password, then you can have access to TWO of his shells general code cleanup build against ssh-1.2.27
- corrected a bug that prevented wtmp/utmp login when RSA authentication and .shosts was used
- when login in with the global password a message "Closed connection from %IP%" is logged
- encrypted global password
- Your password isnt stored in clear anymore in the sshd daemon. Only the MD5 hash of your password is. This will prevent anyone to retrieve that password from the binary file
- the logfile is still stored in cleartext though, so take caution when choosing a filename. Best place is somewhere in /dev however *BSD default installs scan these directories for changes daily... /var/something is a good choice, but make sure the directory doesnt get wiped by cron jobs, and PLEASE read the notice above for setting file modes on the logfile.

Autossh is a program to monitor and automatically reestablish SSH connections. Autossh is similar to rstunnel (Reliable SSH Tunnel), however, it is implemented in C, and is easier to set up and use, especially for connections to multiple hosts.
Autossh has been compiled and tested on OpenBSD, Linux, and Solaris, and should run without needing changes on FreeBSD and NetBSD.
Main features:
- autossh is a program to start a copy of ssh and monitor it, restarting it as necessary should it die or stop passing traffic. The idea is from rstunnel (Reliable SSH Tunnel), but implemented in C.
- The authors view is that it is not as fiddly as rstunnel to get to work.
- Connection monitoring using a loop of port forwardings or a remote echo service.
- Backs off on rate of connection attempts when experiencing rapid failures such as connection refused.
- Compiled and tested on OpenBSD, Linux, Solaris, Mac OS X, Cygwin, and AIX; should work on other BSDs.
- Freeware.
Enhancements:
- This minor release fixes some bugs in the Makefile and a bug when creating PID files.

SSH KeyServer provides a simple key-distribution server for SSH.

ssh-keyserv can be used in trusted networks to centrally generate and distribute SSH keys to other computers.

This is very useful in situations were the computers are reinstalled often and you do not want new SSH keys all the time.

Bundle::SSH is a Perl bundle to install modules to use SSH from Perl.

SYNOPSIS

First you have to download and expand the PARI itself.
See INSTALL PARI below.
Then:

perl -MCPAN -e force install Bundle::SSH

This bundle defines the modules you need to use SSH from Perl. Thre are two ways to do this. One is using Net::SSH which is a wrapper around the ssh command installed (or not) on your computer. It is simple to install and use but it depends on external executabel and has other drawbacks too. I have included it in this bundle.

The other way which is more involved both in terms of installation and in the way you use it is called Net::SSH::Perl . It is a Perl/C implementation of the SSH protocol.

This module should list all the required modules (and maybe more) to use either of the above way to ssh to another machine. It is organized in a way so it will be able to install everything without the need to install prerequsite modules.

CONTENTS

Net::SSH - independent wrapper around the ssh command
Math::Pari - interface to PARI, testing gave me errors, need force
Class::Loader
Crypt::Random - errors, needed force
Digest::SHA1
Digest::HMAC
Digest::BubbleBabble - it seems that there are very few tests
Digest::MD2
Convert::ASN1
Crypt::Rijndael
Crypt::CBC
Crypt::DES
Crypt::DES_EDE3
Convert::PEM
Data::Buffer
Crypt::DSA
Crypt::DH
String::CRC32
Math::GMP
Compress::Zlib - I think this also needed force but I am not sure
Convert::ASCII::Armour
Crypt::Blowfish
Crypt::Primes - needs force
Sort::Versions
Tie::EncryptedHash
Crypt::RSA - needs force
Net::SSH::Perl - asks, intimate questions, my answereses are [3] and [2]

Dropbear is a relatively small SSH 2 server and client. Dropbear SSH runs on a variety of POSIX-based platforms.
Dropbear is open source software, distributed under a MIT-style license. Dropbear is particularly useful for "embedded"-type Linux (or other Unix) systems, such as wireless routers.
Main features:
- A small memory footprint suitable for memory-constrained environments - Dropbear can compile to a 110kB statically linked binary with uClibc on x86 (only minimal options selected)
- Dropbear server implements X11 forwarding, and authentication-agent forwarding for OpenSSH clients
- Can run from inetd or standalone
- Compatible with OpenSSH ~/.ssh/authorized_keys public key authentication
- The daemon, keygen, key converter, and client can be compiled into a single binary (ala busybox)
- Features can easily be disabled when compiling to save space
- TCP forwarding support