Class: DmCryptHelper

Inherits:
RemoteCommandHandler show all
Defined in:
lib/help/dm_crypt_helper.rb

Overview

This class implements helper methods for Dm Encryption (see #Scripts::EC2::DmEncrypt)

Instance Attribute Summary

Attributes inherited from RemoteCommandHandler

#logger, #ssh_session, #use_sudo

Instance Method Summary collapse

Methods inherited from RemoteCommandHandler

#connect, #connect_with_keyfile, #create_filesystem, #disconnect, #drive_mounted?, #drive_mounted_as?, #echo, #file_exists?, #get_output, #initialize, #install, #local_rcopy, #local_rsync, #mkdir, #mount, #remote_execute, #remote_rsync, #retrieve_os, #scp, #stdout_contains?, #tools_installed?, #umount, #upload, #zip

Constructor Details

This class inherits a constructor from RemoteCommandHandler

Instance Method Details

#encrypt_storage(name, password, device, path) ⇒ Object

Encrypts the device and mounting it using dm-crypt tools. Params

  • name: name of the virtual volume

  • password: paraphrase to be used for encryption

  • device: device to be encrypted

  • path: path to which the encrypted device is mounted



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# File 'lib/help/dm_crypt_helper.rb', line 13

def encrypt_storage(name, password, device, path)
  if file_exists?(device)
    if !file_exists?("/dev/mapper/#{name}")
      @logger.debug("mapper device #{name} not yet existing")
      #device not configured, go ahead
      remote_execute("cryptsetup luksFormat  -q #{device}", password)
      @logger.debug("device #{device} formatted as #{name}")
      remote_execute("cryptsetup luksOpen #{device} #{name}",password)
      @logger.debug("device #{device} / #{name} opened")
      self.create_filesystem("ext3", "/dev/mapper/#{name}")
      @logger.debug("filesystem created on /dev/mapper/#{name}")
      self.mkdir(path)
      self.mount("/dev/mapper/#{name}", path)
      #TODO: make a final check that everything worked? ?
    else
      #device already exists, just re-activate it
      @logger.debug("mapper device #{name} is existing")
      remote_execute("cryptsetup luksOpen #{device} #{name}")
      @logger.debug("device #{device} /dev/mapper/#{name} opened")
      self.mkdir(path) unless file_exists?(path)
      self.mount("/dev/mapper/#{name}", path) unless drive_mounted_as?("/dev/mapper/#{name}", path)
    end
  else
    #device does not even exist
    raise Exception.new("device #{device} does not exist")
  end

end

#test_storage_encryption(password, mount_point, path) ⇒ Object

Check if the storage is encrypted (not yet implemented).



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# File 'lib/help/dm_crypt_helper.rb', line 43

def test_storage_encryption(password, mount_point, path)
end

#undo_encryption(name, path) ⇒ Object 



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# File 'lib/help/dm_crypt_helper.rb', line 46

def undo_encryption(name, path)
  remote_execute("umount #{path}", nil, true)
  @logger.debug("drive #{path} unmounted")
  remote_execute("cryptsetup luksClose /dev/mapper/#{name}", nil, true)
  @logger.debug("closed /dev/mapper/#{name} unmounted")
end