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#
# Node initialization.
# Most of the fun stuff is in tasks.rb.
#
module LeapCli; module Commands
desc 'Node management'
command :node do |cmd|
cmd.desc 'Bootstraps a node or nodes, setting up SSH keys and installing prerequisite packages'
cmd.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, installing packages that are required for deploying, and registering important facts. " +
"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."
cmd.arg_name 'FILTER'
cmd.command :init do |init|
#init.switch 'echo', :desc => 'If set, passwords are visible as you type them (default is hidden)', :negatable => false
# ^^ i am not sure how to get this working with sshkit
init.flag :port, :desc => 'Override the default SSH port.', :arg_name => 'PORT'
init.flag :ip, :desc => 'Override the default SSH IP address.', :arg_name => 'IPADDRESS'
init.action do |global,options,args|
run_node_init(global, options, args)
end
end
end
private
def run_node_init(global, options, args)
require 'leap_cli/ssh'
assert! args.any?, 'You must specify a FILTER'
finished = []
manager.filter!(args).each_node do |node|
is_node_alive(node, options)
save_public_host_key(node, global, options) unless node.vagrant?
update_compiled_ssh_configs
# allow password auth for new nodes:
options[:auth_methods] = ["publickey", "password"]
SSH.remote_command(node, options) do |ssh, host|
if node.vagrant?
ssh.scripts.install_insecure_vagrant_key
end
ssh.scripts.install_authorized_keys
ssh.scripts.install_prerequisites
unless node.vagrant?
ssh.log(:checking, "SSH host keys") do
response = ssh.capture(get_ssh_keys_cmd, :log_output => false)
if response
update_local_ssh_host_keys(node, response)
end
end
end
ssh.log(:updating, "facts") do
response = ssh.capture(facter_cmd)
if response
update_node_facts(node.name, response)
end
end
end
finished << node.name
end
log :completed, "initialization of nodes #{finished.join(', ')}"
end
##
## PRIVATE HELPERS
##
def is_node_alive(node, options)
address = options[:ip] || node.ip_address
port = options[:port] || node.ssh.port
log :connecting, "to node #{node.name}"
assert_run! "nc -zw3 #{address} #{port}",
"Failed to reach #{node.name} (address #{address}, port #{port}). You can override the configured IP address and port with --ip or --port."
end
#
# 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, global, options)
log :fetching, "public SSH host key for #{node.name}"
address = options[:ip] || node.ip_address
port = options[:port] || node.ssh.port
host_keys = get_public_keys_for_ip(address, port)
pub_key_path = Path.named_path([:node_ssh_pub_key, node.name])
if Path.exists?(pub_key_path)
if host_keys.include? SSH::Key.load(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 keys we just fetched for #{node.name} doesn't match what we have saved previously.", :indent => 1
log "Delete the file #{pub_key_path} if you really want to remove the trusted SSH host key.", :indent => 2
end
end
else
known_key = host_keys.detect{|k|k.in_known_hosts?(node.name, node.ip_address, node.domain.name)}
if known_key
log :trusted, "- Public SSH host key for #{node.name} is trusted (key found in your ~/.ssh/known_hosts)"
else
public_key = SSH::Key.pick_best_key(host_keys)
if public_key.nil?
bail!("We got back #{host_keys.size} host keys from #{node.name}, but we can't support any of them.")
else
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 !global[:yes] && !agree(" Is this correct? ")
bail!
else
known_key = public_key
end
end
end
puts
write_file! [:node_ssh_pub_key, node.name], known_key.to_s
end
end
#
# Get the public host keys for a host using ssh-keyscan.
# Return an array of SSH::Key objects, one for each key.
#
def get_public_keys_for_ip(address, port=22)
assert_bin!('ssh-keyscan')
output = assert_run! "ssh-keyscan -p #{port} #{address}", "Could not get the public host key from #{address}:#{port}. Maybe sshd is not running?"
if output.empty?
bail! :failed, "ssh-keyscan returned empty output."
end
if output =~ /No route to host/
bail! :failed, 'ssh-keyscan: no route to %s' % address
else
keys = SSH::Key.parse_keys(output)
if keys.empty?
bail! "ssh-keyscan got zero host keys back (that we understand)! Output was: #{output}"
else
return keys
end
end
end
# run on the server to generate a string suitable for passing to SSH::Key.parse_keys()
def get_ssh_keys_cmd
"/bin/grep ^HostKey /etc/ssh/sshd_config | /usr/bin/awk '{print $2 \".pub\"}' | /usr/bin/xargs /bin/cat"
end
#
# Sometimes the ssh host keys on the server will be better than what we have
# stored locally. In these cases, ask the user if they want to upgrade.
#
def update_local_ssh_host_keys(node, remote_keys_string)
remote_keys = SSH::Key.parse_keys(remote_keys_string)
return unless remote_keys.any?
current_key = SSH::Key.load(Path.named_path([:node_ssh_pub_key, node.name]))
best_key = SSH::Key.pick_best_key(remote_keys)
return unless best_key && current_key
if current_key != best_key
say(" One of the SSH host keys for node '#{node.name}' is better than what you currently have trusted.")
say(" Current key: #{current_key.summary}")
say(" Better key: #{best_key.summary}")
if agree(" Do you want to use the better key? ")
write_file! [:node_ssh_pub_key, node.name], best_key.to_s
end
else
log(3, "current host key does not need updating")
end
end
end; end
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