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Full Discussion: Are free public shells for ssh tunneling safe?
Top Forums Shell Programming and Scripting Are free public shells for ssh tunneling safe? Post 302468089 by DGPickett on Monday 1st of November 2010 03:20:36 PM
Old 11-01-2010
No, once you set the key, they are locked out.

You should get your ssh code from trustworth sources, as hackers can easily modify open source from trap doors. This applies to all downloads! Beware of odd binary code sources.

I believe ssh2 is both free and stronger. If you do a little man page reading, you can find out how to maximize your key size. This is especially important when you do passwordless PK access, where the key password is blank. I believe ther are even tools out there to embed the key's password in a running session, so it can be proffered by your avatar at approriate moments to unlock your key. BTW, the keys are just used a short while, to start up the connection session, and then a random session key runs the session for a longer time before a new key is negotiated.
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LEARN ABOUT OPENSOLARIS

shells

shells(4)							   File Formats 							 shells(4)

NAME

       shells - shell database

SYNOPSIS

       /etc/shells

DESCRIPTION

       The shells file contains a list of the shells on the system. Applications use this file to determine whether a shell is valid. See getuser-
       shell(3C). For each shell a single line should be present, consisting of the shell's path, relative to root.

       A hash mark (#) indicates the beginning of a comment; subsequent characters up to the end of the line are not interpreted by  the  routines
       which search the file. Blank lines are also ignored.

       The following default shells are used by utilities: /bin/bash, /bin/csh, /bin/jsh, /bin/ksh, /bin/ksh93, /bin/pfcsh, /bin/pfksh, /bin/pfsh,
       /bin/sh, /bin/tcsh, /bin/zsh, /sbin/jsh, /sbin/sh, /usr/bin/bash, /usr/bin/csh, /usr/bin/jsh, /usr/bin/ksh, /usr/bin/ksh93, /usr/bin/pfcsh,
       /usr/bin/pfksh, /usr/bin/pfsh, and /usr/bin/sh, /usr/bin/tcsh, /usr/bin/zsh, and /usr/sfw/bin/zsh. /etc/shells overrides the default list.

       Invalid shells in /etc/shells could cause unexpected behavior, such as being unable to log in by way of ftp(1).

FILES

       /etc/shells    list of shells on system

SEE ALSO

       vipw(1B), ftpd(1M), sendmail(1M), getusershell(3C), aliases(4)

SunOS 5.11							    20 Nov 2007 							 shells(4)
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