Test SSH but do not return password prompt Post: 302637035

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Top Forums Programming Test SSH but do not return password prompt Post 302637035 by doonan_79 on Tuesday 8th of May 2012 09:20:14 AM

05-08-2012

Registered User

FOLLOW UP:

FYI Have now tested code and implemented a change following NeutronScott's tip. See working function:

Code:

check_passwordless_ssh_working()
#check passed parameter, assuming it is a hostname, to see if SSH works to that host
{
hostname=${1}
passwordless_ssh_whoami=$(ssh -q -o BatchMode=yes $hostname whoami)
 
local_whoami=$(whoami)
 
if [[ $passwordless_ssh_whoami = $local_whoami ]] ; then
  passwordless_ssh_working=1
  echo "SSH_working._SSH_response:_$passwordless_ssh_whoami._Local_response:_$local_whoami" $passwordless_ssh_working
else
  passwordless_ssh_working=0
  echo "SSH_NOT_working._SSH_response:_$passwordless_ssh_whoami._Local_response:_$local_whoami" $passwordless_ssh_working
fi
}

The simple addition of the BatchMode option (-o) has allowed us to capture the fact that passwordless SSH isn't working, without prompting for a password.

---------- Post updated at 14:20 ---------- Previous update was at 14:18 ----------

NB Notice I return values in a string using echo. As this is a standard return I can then read them as if in an array, using awk to print $1 and $2. $1 showing the text response and $2 showing the numeric response. This is the reason the text all has underscores and no spaces (so it is auto-read as a single field/entry).

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LEARN ABOUT MINIX

ssh-argv0

SSH-ARGV0(1)						    BSD General Commands Manual 					      SSH-ARGV0(1)

NAME

     ssh-argv0 -- replaces the old ssh command-name as hostname handling

SYNOPSIS

     hostname | user@hostname [-l login_name] [command]

     hostname | user@hostname [-afgknqstvxACNTX1246] [-b bind_address] [-c cipher_spec] [-e escape_char] [-i identity_file] [-l login_name]
     [-m mac_spec] [-o option] [-p port] [-F configfile] [-L port:host:hostport] [-R port:host:hostport] [-D port] [command]

DESCRIPTION

     ssh-argv0 replaces the old ssh command-name as hostname handling.	If you link to this script with a hostname then executing the link is
     equivalent to having executed ssh with that hostname as an argument.  All other arguments are passed to ssh and will be processed normally.

OPTIONS

     See ssh(1).

FILES

     See ssh(1).

AUTHORS

     OpenSSH is a derivative of the original and free ssh 1.2.12 release by Tatu Ylonen.  Aaron Campbell, Bob Beck, Markus Friedl, Niels Provos,
     Theo de Raadt and Dug Song removed many bugs, re-added newer features and created OpenSSH.  Markus Friedl contributed the support for SSH
     protocol versions 1.5 and 2.0.  Jonathan Amery wrote this ssh-argv0 script and the associated documentation.

SEE ALSO

     ssh(1)

Debian Project							 September 7, 2001						    Debian Project

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