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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PAM_SSH(8) BSD System Manager's Manual PAM_SSH(8)
NAME
pam_ssh -- authentication and session management with SSH private keys
SYNOPSIS
[service-name] module-type control-flag pam_ssh [options]
DESCRIPTION
The SSH authentication service module for PAM, pam_ssh provides functionality for two PAM categories: authentication and session management.
In terms of the module-type parameter, they are the ``auth'' and ``session'' features. It also provides null functions for the remaining
categories.
SSH Authentication Module
The SSH authentication component provides a function to verify the identity of a user (pam_sm_authenticate()), by prompting the user for a
passphrase and verifying that it can decrypt the target user's SSH key using that passphrase.
The following options may be passed to the authentication module:
debug syslog(3) debugging information at LOG_DEBUG level.
use_first_pass If the authentication module is not the first in the stack, and a previous module obtained the user's password, that password
is used to authenticate the user. If this fails, the authentication module returns failure without prompting the user for a
password. This option has no effect if the authentication module is the first in the stack, or if no previous modules
obtained the user's password.
try_first_pass This option is similar to the use_first_pass option, except that if the previously obtained password fails, the user is
prompted for another password.
keyfiles Specify the comma-separated list of files in $HOME/.ssh to check for SSH keys. The default is ``id_dsa,id_rsa,identity''.
nullok Allow empty passphrases.
SSH Session Management Module
The SSH session management component provides functions to initiate (pam_sm_open_session()) and terminate (pam_sm_close_session()) sessions.
The pam_sm_open_session() function starts an SSH agent, passing it any private keys it decrypted during the authentication phase, and sets
the environment variables the agent specifies. The pam_sm_close_session() function kills the previously started SSH agent by sending it a
SIGTERM.
The following options may be passed to the session management module:
debug syslog(3) debugging information at LOG_DEBUG level.
FILES
$HOME/.ssh/identity SSH1/OpenSSH RSA key
$HOME/.ssh/id_dsa OpenSSH DSA key
$HOME/.ssh2/id_rsa_* SSH2 RSA keys
$HOME/.ssh2/id_dsa_* SSH2 DSA keys
SEE ALSO
ssh-agent(1), syslog(3), pam.conf(5), pam(8)
AUTHORS
Andrew J. Korty <ajk@iu.edu> wrote pam_ssh. Dag-Erling Smorgrav wrote the original OpenPAM support code. Mark R V Murray wrote the original
version of this manual page.
BSD
November 26, 2001 BSD