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POProxy tunnel through multiple systems with Ruby Net::SSH
 

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  1. POProxy tunnel through multiple systems with Ruby Net::SSH
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    <p>I need some suggestions on how to use the Ruby Net::SSH and Net::SCP gem to proxy through several systems in order to execute commands or copy files.</p> <p>It's very similar (if not almost exactly the same) as this previous post I made, using basic ssh from the linux command line.</p> <p><a href="https://stackoverflow.com/questions/10592212/how-to-script-multiple-ssh-and-scp-commands-to-various-systems">How to script multiple ssh and scp commands to various systems</a></p> <p>For example, LOCAL is my local system.</p> <p>System A is a second system connected to LOCAL</p> <p>System B is a third system connected to System A only. Also, System B is configured to only allow access from System A by way of it's ssh key.</p> <p>For normal ssh from the command line, I have my .ssh/config file set up in this way:</p> <pre><code>Host systemA HostName 192.168.0.10 User A-user Host systemB ProxyCommand ssh -e none systemA exec /bin/nc %h %p 2&gt;/dev/null HostName 192.168.0.11 User B-user IdentityFile ~/.ssh/systemA_id_dsa </code></pre> <p>From this point, as long as my pub key is in the authorized_hosts of sysA (let's assume it always will be), and sysA's pub key is in the authorized_hosts sysB (same assumption), the following will work seamlessly:</p> <pre><code>ssh systemB </code></pre> <p>I would like to implement this exact behavior in Ruby. I have some code similar to the following:</p> <pre><code>require 'net/ssh' require 'net/ssh/proxy/command' str = 'ssh -l A-user -i /home/A-user/.ssh/id_dsa -e none 192.168.0.10 exec /bin/nc %h %p 2&gt;/dev/null' proxy = Net::SSH::Proxy::Command.new(str) Net::SSH.start('192.168.0.11', 'B-user', :proxy =&gt; proxy) do |ssh| ssh.exec! "ls -lA" end </code></pre> <p>Unfortunately, this isn't working. I get an authentication failure.</p> <pre><code>~/.rvm/gems/ruby-1.9.3-p327/gems/net-ssh-2.6.2/lib/net/ssh.rb:201:in `start': root (Net::SSH::AuthenticationFailed) </code></pre> <p>What am I missing here?</p>
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