require 'net/ssh/known_hosts' require 'tempfile' module LeapCli; module Commands ## ## COMMANDS ## desc 'Node management' command :node do |node| node.desc 'Create a new configuration file for a node' node.long_desc ["If specified, the optional argument seed-options can be used to seed values in the node configuration file.", "The format is property_name:value.", "For example: `leap node add web1 ip_address:1.2.3.4 services:webapp`.", "To set nested properties, property name can contain '.', like so: `leap node add web1 ssh.port:44`", "To set multiple values for a single property, use ',', like so: `leap node add mynode services:webapp,dns`"].join("\n\n") node.arg_name ' [seed-options]' # , :optional => false, :multiple => false node.command :add do |add| add.switch :local, :desc => 'Make a local testing node (by automatically assigning the next available local IP address). Local nodes are run as virtual machines on your computer.', :negatable => false add.action do |global_options,options,args| # argument sanity checks name = args.first assert! name, 'No specified.' assert! name =~ /^[0-9a-z-]+$/, "illegal characters used in node name '#{name}'" assert_files_missing! [:node_config, node.name] # create and seed new node node = Config::Object.new if options[:local] node['ip_address'] = pick_next_vagrant_ip_address end seed_node_data(node, args[1..-1]) # write the file write_file! [:node_config, name], node.dump_json + "\n" end end node.desc 'Bootstraps a node or nodes, setting up SSH keys and installing prerequisite packages' node.long_desc "This command prepares a server to be used with the LEAP Platform by saving the server's SSH host key, " + "copying the authorized_keys file, and installing packages that are required for deploying. " + "Node init must be run before deploying to a server, and the server must be running and available via the network. " + "This command only needs to be run once, but there is no harm in running it multiple times." node.arg_name '' #, :optional => false, :multiple => false node.command :init do |init| init.switch 'echo', :desc => 'If set, passwords are visible as you type them (default is hidden)', :negatable => false init.action do |global_options,options,args| assert! args.any?, 'You must specify a node-filter' finished = [] manager.filter(args).each_node do |node| ping_node(node) save_public_host_key(node) update_compiled_ssh_configs ssh_connect(node, :bootstrap => true, :echo => options[:echo]) do |ssh| ssh.install_authorized_keys ssh.install_prerequisites end finished << node.name end log :completed, "initialization of nodes #{finished.join(', ')}" end end node.desc 'Renames a node file, and all its related files' node.arg_name ' ' node.command :mv do |mv| mv.action do |global_options,options,args| node = get_node_from_args(args) new_name = args.last ensure_dir [:node_files_dir, new_name] Path::NODE_PATHS.each do |path| rename_file! [path, node.name], [path, new_name] end remove_directory! [:node_files_dir, node.name] end end node.desc 'Removes a node file, and all its related files' node.arg_name '' #:optional => false #, :multiple => false node.command :rm do |rm| rm.action do |global_options,options,args| node = get_node_from_args(args) (Path::NODE_PATHS + [:node_files_dir]).each do |path| remove_file! [path, node.name] end if node.vagrant? vagrant_command("destroy --force", [node.name]) end end 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.keys.sort.each do |node_name| node = manager.nodes[node_name] 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(' ') buffer << "\n" 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) log :fetching, "public SSH host key for #{node.name}" public_key = get_public_key_for_ip(node.ip_address, node.ssh.port) 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) log :trusted, "- Public SSH host key for #{node.name} matches previously saved key", :indent => 1 else bail! do log :error, "The public SSH host key we just fetched for #{node.name} doesn't match what we have saved previously.", :indent => 1 log "Remove the file #{pub_key_path} if you really want to change it.", :indent => 2 end end elsif public_key.in_known_hosts?(node.name, node.ip_address, node.domain.name) log :trusted, "- 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, port=22) assert_bin!('ssh-keyscan') output = assert_run! "ssh-keyscan -p #{port} -t rsa #{address}", "Could not get the public host key from #{address}:#{port}. 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) log :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 def seed_node_data(node, args) args.each do |seed| key, value = seed.split(':') if value =~ /,/ value = value.split(',') end assert! key =~ /^[0-9a-z\._]+$/, "illegal characters used in property '#{key}'" if key =~ /\./ key_parts = key.split('.') final_key = key_parts.pop current_object = node key_parts.each do |key_part| current_object[key_part] = Config::Object.new current_object = current_object[key_part] end current_object[final_key] = value else node[key] = value end end end end; end