Ruby/NetSSH try username and password only once?

Question

Is there a way to fail immediately after trying a username and password sequence with Net::SSH.start()? I am looking to test to see if credentials work then stop afterwards, here is the code that I have

output = 0
Net::SSH.start('host', 'user', :password => "pass") do |ssh|
   output = ssh.exec! 'echo "1"'
end
puts output

score 4 · Accepted Answer · answered Jan 15 '15 at 00:04

This should restrict authentication to password only, and no prompts or retries:

Net::SSH.start('host', 'user',  
               :password     => 'pass', 
               :auth_methods => [ 'password' ],
               :number_of_password_prompts => 0)

:auth_methods restricts SSH to only try those authentication methods which are listed in the array. In this case we only want to try password authentication.

:number_of_password_prompts only works with the password auth method, and if you set it to zero it will never prompt for a password, even if the authentication fails.

I couldn't find this anywhere in the docs, and it occurs to me now that this is a `ssh-config` option, thank you for this! — Johan Lindskogen, Jan 21 '15 at 10:01

Ruby/NetSSH try username and password only once?

1 Answers1