Class: Chef::Knife::Cloud::SshBootstrapProtocol

Inherits:
BootstrapProtocol show all
Defined in:
lib/chef/knife/cloud/chefbootstrap/ssh_bootstrap_protocol.rb

Instance Attribute Summary

Attributes inherited from BootstrapProtocol

#bootstrap, #config, #initial_sleep_delay, #ui

Instance Method Summary collapse

Methods inherited from BootstrapProtocol

#send_bootstrap_command

Methods included from Helpers

#locate_config_value, #msg_pair

Constructor Details

#initialize(config) ⇒ SshBootstrapProtocol

Returns a new instance of SshBootstrapProtocol.



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# File 'lib/chef/knife/cloud/chefbootstrap/ssh_bootstrap_protocol.rb', line 30

def initialize(config)
  @bootstrap = (config[:image_os_type] == 'linux') ? Chef::Knife::Bootstrap.new : Chef::Knife::BootstrapWindowsSsh.new
  super
end

Instance Method Details

#configure_ssh_gateway(ssh_gateway) ⇒ Object



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# File 'lib/chef/knife/cloud/chefbootstrap/ssh_bootstrap_protocol.rb', line 150

def configure_ssh_gateway(ssh_gateway)
  gw_host, gw_user = ssh_gateway.split('@').reverse
  gw_host, gw_port = gw_host.split(':')
  gateway_options = { :port => gw_port || 22 }

  # Load the SSH config for the SSH gateway host.
  # Set the gateway user if it was not part of the
  # SSH gateway string, and use any configured
  # SSH keys.
  ssh_gateway_config = Net::SSH::Config.for(gw_host)
  gw_user ||= ssh_gateway_config[:user]

  # Always use the gateway keys from the SSH Config
  gateway_keys = ssh_gateway_config[:keys]        

  # Use the keys specificed on the command line if available (overrides SSH Config)
  if locate_config_value(:ssh_gateway_identity)
    gateway_keys = Array(locate_config_value(:ssh_gateway_identity))
  end

  unless gateway_keys.nil?
    gateway_options[:keys] = gateway_keys
  end

  Net::SSH::Gateway.new(gw_host, gw_user, gateway_options)
end

#get_ssh_gateway_for(hostname) ⇒ Object



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# File 'lib/chef/knife/cloud/chefbootstrap/ssh_bootstrap_protocol.rb', line 70

def get_ssh_gateway_for(hostname)
  if locate_config_value(:ssh_gateway)
    # The ssh_gateway specified in the knife config (if any) takes
    # precedence over anything in the SSH configuration
    Chef::Log.debug("Using ssh gateway #{locate_config_value(:ssh_gateway)} from knife config")
    locate_config_value(:ssh_gateway)
  else
    # Next, check if the SSH configuration has a ProxyCommand
    # directive for this host. If there is one, parse out the
    # host from the proxy command
    ssh_proxy = Net::SSH::Config.for(hostname)[:proxy]
    if ssh_proxy.respond_to?(:command_line_template)
      # ssh gateway_hostname nc %h %p
      proxy_pattern = /ssh\s+(\S+)\s+nc/
      matchdata = proxy_pattern.match(ssh_proxy.command_line_template)
      if matchdata.nil?
        Chef::Log.debug("Unable to determine ssh gateway for '#{hostname}' from ssh config template: #{ssh_proxy.command_line_template}")
        nil
      else
        # Return hostname extracted from command line template
        Chef::Log.debug("Using ssh gateway #{matchdata[1]} from ssh config")
        matchdata[1]
      end
    else
      # Return nil if we cannot find an ssh_gateway
      Chef::Log.debug("No ssh gateway found, making a direct connection")
      nil
    end
  end
end

#init_bootstrap_optionsObject



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# File 'lib/chef/knife/cloud/chefbootstrap/ssh_bootstrap_protocol.rb', line 35

def init_bootstrap_options
  bootstrap.config[:ssh_user] = @config[:ssh_user]
  bootstrap.config[:ssh_password] = @config[:ssh_password]
  bootstrap.config[:ssh_port] = locate_config_value(:ssh_port)
  bootstrap.config[:identity_file] = @config[:identity_file]
  bootstrap.config[:host_key_verify] = @config[:host_key_verify]
  bootstrap.config[:use_sudo] = true unless @config[:ssh_user] == 'root'
  bootstrap.config[:template_file] =  @config[:template_file]
  bootstrap.config[:ssh_gateway] = locate_config_value(:ssh_gateway)
  bootstrap.config[:forward_agent] = locate_config_value(:forward_agent)
  bootstrap.config[:use_sudo_password] = locate_config_value(:use_sudo_password)
  super
end

#tcp_test_ssh(hostname, ssh_port) ⇒ Object



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# File 'lib/chef/knife/cloud/chefbootstrap/ssh_bootstrap_protocol.rb', line 101

def tcp_test_ssh(hostname, ssh_port)
  begin
    tcp_socket = TCPSocket.new(hostname, ssh_port)
    readable = IO.select([tcp_socket], nil, nil, 5)
    if readable
      ssh_banner = tcp_socket.gets
      if ssh_banner.nil? or ssh_banner.empty?
        false
      else
        Chef::Log.debug("ssh accepting connections on #{hostname}, banner is #{tcp_socket.gets}")
        yield
        true
      end
    else
      false
    end
  rescue Errno::EPERM, Errno::ETIMEDOUT
    Chef::Log.debug("ssh timed out: #{hostname}")
    false
  rescue SocketError, Errno::ECONNREFUSED, Errno::EHOSTUNREACH, Errno::ENETUNREACH, IOError
    Chef::Log.debug("ssh failed to connect: #{hostname}")
    sleep 2
    false
   # This happens on some mobile phone networks
  rescue Errno::ECONNRESET
     Chef::Log.debug("ssh reset its connection: #{hostname}")
    sleep 2
    false
  ensure
    tcp_socket && tcp_socket.close
  end
end

#tunnel_test_ssh(ssh_gateway, hostname, &block) ⇒ Object



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# File 'lib/chef/knife/cloud/chefbootstrap/ssh_bootstrap_protocol.rb', line 134

def tunnel_test_ssh(ssh_gateway, hostname, &block)
  begin
    status = false
    gateway = configure_ssh_gateway(ssh_gateway)
    gateway.open(hostname, locate_config_value(:ssh_port)) do |local_tunnel_port|
      status = tcp_test_ssh('localhost', local_tunnel_port, &block)
    end
    status
  rescue SocketError, Errno::ECONNREFUSED, Errno::EHOSTUNREACH, Errno::ENETUNREACH, IOError
    sleep 2
    false
  rescue Errno::EPERM, Errno::ETIMEDOUT
    false
  end
end

#wait_for_server_readyObject



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# File 'lib/chef/knife/cloud/chefbootstrap/ssh_bootstrap_protocol.rb', line 49

def wait_for_server_ready
  print "\n#{ui.color("Waiting for sshd to host (#{@config[:bootstrap_ip_address]})", :magenta)}"

  ssh_gateway = get_ssh_gateway_for(@config[:bootstrap_ip_address])

  # The ssh_gateway & subnet_id are currently supported only in EC2.
  if ssh_gateway
    print(".") until tunnel_test_ssh(ssh_gateway, @config[:bootstrap_ip_address]) {
      @initial_sleep_delay = !!locate_config_value(:subnet_id) ? 40 : 10
      sleep @initial_sleep_delay
      puts("done")
    }
  else
    print(".") until tcp_test_ssh(@config[:bootstrap_ip_address], locate_config_value(:ssh_port)) {
      @initial_sleep_delay = !!locate_config_value(:subnet_id) ? 40 : 10
      sleep @initial_sleep_delay
      puts("done")
    }
  end
end