require 'net/ssh/known_hosts' require 'tempfile' module LeapCli; module Commands ## ## COMMANDS ## desc 'not yet implemented... Create a new configuration for a node' command :'new-node' do |c| c.action do |global_options,options,args| end end desc 'Bootstraps a node, setting up ssh keys and installing prerequisites' arg_name '', :optional => false, :multiple => false command :'init-node' do |c| c.action do |global_options,options,args| node = get_node_from_args(args) ping_node(node) save_public_host_key(node) update_compiled_ssh_configs ssh_connect(node, :bootstrap => true) do |ssh| ssh.install_authorized_keys ssh.install_prerequisites end end end desc 'not yet implemented' command :'rename-node' do |c| c.action do |global_options,options,args| end end desc 'not yet implemented' arg_name '', :optional => false, :multiple => false command :'rm-node' do |c| c.action do |global_options,options,args| remove_file!() end end ## ## PUBLIC HELPERS ## # # generates the known_hosts file. # # we do a 'late' binding on the hostnames and ip part of the ssh pub key record in order to allow # for the possibility that the hostnames or ip has changed in the node configuration. # def update_known_hosts buffer = StringIO.new manager.nodes.values.each do |node| hostnames = [node.name, node.domain.internal, node.domain.full, node.ip_address].join(',') pub_key = read_file([:node_ssh_pub_key,node.name]) if pub_key buffer << [hostnames, pub_key].join(' ') end end write_file!(:known_hosts, buffer.string) end def get_node_from_args(args) node_name = args.first node = manager.node(node_name) assert!(node, "Node '#{node_name}' not found.") node end private ## ## PRIVATE HELPERS ## # # saves the public ssh host key for node into the provider directory. # # see `man sshd` for the format of known_hosts # def save_public_host_key(node) progress("Fetching public SSH host key for #{node.name}") public_key = get_public_key_for_ip(node.ip_address) pub_key_path = Path.named_path([:node_ssh_pub_key, node.name]) if Path.exists?(pub_key_path) if public_key == SshKey.load_from_file(pub_key_path) progress("Public SSH host key for #{node.name} has not changed") else bail!("WARNING: The public SSH host key we just fetched for #{node.name} doesn't match what we have saved previously. Remove the file #{pub_key_path} if you really want to change it.") end elsif public_key.in_known_hosts?(node.name, node.ip_address, node.domain.name) progress("Public SSH host key for #{node.name} is trusted (key found in your ~/.ssh/known_hosts)") else puts say("This is the SSH host key you got back from node \"#{node.name}\"") say("Type -- #{public_key.bits} bit #{public_key.type.upcase}") say("Fingerprint -- " + public_key.fingerprint) say("Public Key -- " + public_key.key) if !agree("Is this correct? ") bail! else puts write_file!([:node_ssh_pub_key, node.name], public_key.to_s) end end end def get_public_key_for_ip(address) assert_bin!('ssh-keyscan') output = assert_run! "ssh-keyscan -t rsa #{address}", "Could not get the public host key. Maybe sshd is not running?" line = output.split("\n").grep(/^[^#]/).first assert! line, "Got zero host keys back!" ip, key_type, public_key = line.split(' ') return SshKey.load(public_key, key_type) end def ping_node(node) progress("Pinging #{node.name}") assert_run!("ping -W 1 -c 1 #{node.ip_address}", "Could not ping #{node.name} (address #{node.ip_address}). Try again, we only send a single ping.") end end; end