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Full Discussion: Test SSH but do not return password prompt
Top Forums Programming Test SSH but do not return password prompt Post 302633023 by doonan_79 on Tuesday 1st of May 2012 08:28:06 AM
Old 05-01-2012
Test SSH but do not return password prompt
Hello forum,

I want to have a function to test for passwordless SSH setup. Pretty simple. However, what I'm finding difficult is to NOT return a password prompt to screen IF it's not in place.

Here's the 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 $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
}

It will return the correct string and integer either way, however if the SSH command does not utilise a passwordless (key pair) SSH setup, then it prompts for the target user's password - you have to get it wrong 3 times to make it fail. I want it to just auto-fail here rather than prompting for a password - any idea how I can do this?
 

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LEARN ABOUT CENTOS

fence_ilo_mp

FENCE_AGENT(8)						      System Manager's Manual						    FENCE_AGENT(8)

NAME

       fence_ilo_mp - Fence agent for HP iLO MP

DESCRIPTION

       fence_ilo_mp  accepts  options  on  the	command line as well as from stdin. Fenced sends parameters through stdin when it execs the agent.
       fence_ilo_mp can be run by itself with command line options.  This is useful for testing and for turning outlets on or off from scripts.

       Vendor URL: http://www.hp.com

PARAMETERS


       -a, --ip=[ip]
	      IP Address or Hostname This parameter is always required.

       -l, --username=[name]
	      Login Name This parameter is always required.

       -p, --password=[password]
	      Login password or passphrase

       -x, --ssh
	      SSH connection

       -c, --command-prompt=[prompt]
	      Force Python regex for command prompt (Default Value: ['MP>', 'hpiLO->'])

       -u, --ipport=[port] TCP/UDP port to use (default 23, 22 if --ssh
	      TCP/UDP port to use for connection with device (Default Value: 23)

       -4, --inet4-only
	      Forces agent to use IPv4 addresses only

       -6, --inet6-only
	      Forces agent to use IPv6 addresses only

       -S, --password-script=[script]
	      Script to retrieve password

       -k, --identity-file=[filename]
	      Identity file for ssh

       --ssh-options=[options]
	      SSH options to use

       -o, --action=[action]
	      Fencing Action (Default Value: reboot)

       -v, --verbose
	      Verbose mode

       -D, --debug-file=[debugfile]
	      Write debug information to given file

       -V, --version
	      Display version information and exit

       -h, --help
	      Display help and exit

       --power-timeout=[seconds]
	      Test X seconds for status change after ON/OFF (Default Value: 20)

       --shell-timeout=[seconds]
	      Wait X seconds for cmd prompt after issuing command (Default Value: 3)

       --login-timeout=[seconds]
	      Wait X seconds for cmd prompt after login (Default Value: 5)

       --power-wait=[seconds]
	      Wait X seconds after issuing ON/OFF (Default Value: 5)

       --delay=[seconds]
	      Wait X seconds before fencing is started (Default Value: 0)

       --retry-on=[attempts]
	      Count of attempts to retry power on (Default Value: 1)

ACTIONS


       on     Power on machine.

       off    Power off machine.

       reboot Reboot machine.

       status This returns the status of the plug/virtual machine.

       list   List available plugs with aliases/virtual machines if there is support for more then one device. Returns N/A otherwise.

       monitor
	      Check the health of fence device

       metadata
	      Display the XML metadata describing this resource.

STDIN PARAMETERS


       ipaddr IP Address or Hostname This parameter is always required.

       login  Login Name This parameter is always required.

       passwd Login password or passphrase

       secure SSH connection

       cmd_prompt
	      Force Python regex for command prompt (Default Value: ['MP>', 'hpiLO->'])

       ipport TCP/UDP port to use for connection with device (Default Value: 23)

       inet4_only
	      Forces agent to use IPv4 addresses only

       inet6_only
	      Forces agent to use IPv6 addresses only

       passwd_script
	      Script to retrieve password

       identity_file
	      Identity file for ssh

       ssh_options
	      SSH options to use

       action Fencing Action (Default Value: reboot)

       verbose
	      Verbose mode

       debug  Write debug information to given file

       version
	      Display version information and exit

       help   Display help and exit

       power_timeout
	      Test X seconds for status change after ON/OFF (Default Value: 20)

       shell_timeout
	      Wait X seconds for cmd prompt after issuing command (Default Value: 3)

       login_timeout
	      Wait X seconds for cmd prompt after login (Default Value: 5)

       power_wait
	      Wait X seconds after issuing ON/OFF (Default Value: 5)

       delay  Wait X seconds before fencing is started (Default Value: 0)

       retry_on
	      Count of attempts to retry power on (Default Value: 1)

fence_ilo_mp (Fence Agent)					    2009-10-20							    FENCE_AGENT(8)
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