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Diffstat (limited to 'lib/leap_cli/commands/bootstrap.rb')
| -rw-r--r-- | lib/leap_cli/commands/bootstrap.rb | 131 |
1 files changed, 131 insertions, 0 deletions
diff --git a/lib/leap_cli/commands/bootstrap.rb b/lib/leap_cli/commands/bootstrap.rb new file mode 100644 index 0000000..11188fb --- /dev/null +++ b/lib/leap_cli/commands/bootstrap.rb @@ -0,0 +1,131 @@ +require 'net/ssh/known_hosts' +require 'tempfile' + +module LeapCli; module Commands + + #desc '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 '<node-name>', :optional => false, :multiple => false + command :'init-node' do |c| + c.action do |global_options,options,args| + node_name = args.first + node = manager.node(node_name) + assert!(node, "Node '#{node_name}' not found.") + 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.") + install_public_host_key(node) + end + end + + desc 'not yet implemented' + command :'rename-node' do |c| + c.action do |global_options,options,args| + end + end + + desc 'not yet implemented' + command :'rm-node' do |c| + c.action do |global_options,options,args| + end + end + + # + # saves the public ssh host key for node into the provider directory. + # + # see `man sshd` for the format of known_hosts + # + def install_public_host_key(node) + progress("Fetching public SSH host key for #{node.name}") + public_key, key_type = get_public_key_for_ip(node.ip_address) + if key_in_known_hosts?(public_key, [node.name, node.ip_address, node.domain.name]) + progress("Public ssh host key for #{node.name} is already trusted (key found in known_hosts)") + else + fingerprint, bits = ssh_key_fingerprint(key_type, public_key) + puts + say("This is the SSH host key you got back from node \"#{node.name}\"") + say("Type -- #{bits} bit #{key_type.upcase}") + say("Fingerprint -- " + fingerprint) + say("Public Key -- " + public_key) + if !agree("Is this correct? ") + bail! + else + puts + # we write the file without ipaddress or hostname, because these might change later, but we want to keep the same key. + write_file!([:node_ssh_pub_key, node.name], [key_type, public_key].join(' ')) + update_known_hosts + 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 [public_key, key_type] + end + + # + # returns true if the particular host_key is found in a "known_hosts" file installed for the current user or on this machine. + # + # - host_key: string of ssh public host key + # - identifiers: an array of identifers (which could be an ip address or hostname) + # + def key_in_known_hosts?(host_key, identifiers) + identifiers.each do |identifier| + Net::SSH::KnownHosts.search_for(identifier).each do |key| + # i am not sure what format ssh keys are in, but key.to_pem returns something different than we need. + # this little bit of magic code will encode correctly. I think the format is base64 encoding of bits, exponent, and modulus. + key_string = [Net::SSH::Buffer.from(:key, key).to_s].pack("m*").gsub(/\s/, "") + return true if key_string == host_key + end + end + return false + end + + # + # gets a fingerprint for a key string + # + def ssh_key_fingerprint(type, key) + assert_bin!('ssh-keygen') + file = Tempfile.new('leap_cli_public_key_') + begin + file.write(type) + file.write(" ") + file.write(key) + file.close + output = assert_run!("ssh-keygen -l -f #{file.path}", "Failed to run ssh-keygen on public key.") + bits, fingerprint, filename, key_type = output.split(' ') + return [fingerprint, bits] + ensure + file.close + file.unlink + end + end + + # + # 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 + +end; end
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