crack_linux.rb

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

class MetasploitModule < Msf::Auxiliary
  include Msf::Auxiliary::PasswordCracker
  include Msf::Exploit::Deprecated
  moved_from 'auxiliary/analyze/jtr_linux'

  def initialize
    super(
      'Name' => 'Password Cracker: Linux',
      'Description' => %{
          This module uses John the Ripper or Hashcat to identify weak passwords that have been
        acquired from unshadowed passwd files from Unix/Linux systems. The module will only crack
        MD5, BSDi and DES implementations by default. However, it can also crack
        Blowfish and SHA(256/512), but it is much slower.
        MD5 is format 500 in hashcat.
        DES is format 1500 in hashcat.
        BSDI is format 12400 in hashcat.
        BLOWFISH is format 3200 in hashcat.
        SHA256 is format 7400 in hashcat.
        SHA512 is format 1800 in hashcat.
      },
      'Author' => [
        'theLightCosine',
        'hdm',
        'h00die' # hashcat integration
      ],
      'License' => MSF_LICENSE, # JtR itself is GPLv2, but this wrapper is MSF (BSD)
      'Actions' => [
        ['john', { 'Description' => 'Use John the Ripper' }],
        ['hashcat', { 'Description' => 'Use Hashcat' }],
        ['auto', { 'Description' => 'Auto-selection of cracker' }]
      ],
      'DefaultAction' => 'auto',
      'Notes' => {
        'Stability' => [CRASH_SAFE],
        'SideEffects' => [],
        'Reliability' => []
      }
    )

    register_options(
      [
        OptBool.new('MD5', [false, 'Include MD5 hashes', true]),
        OptBool.new('DES', [false, 'Indlude DES hashes', true]),
        OptBool.new('BSDI', [false, 'Include BSDI hashes', true]),
        OptBool.new('BLOWFISH', [false, 'Include BLOWFISH hashes (Very Slow)', false]),
        OptBool.new('SHA256', [false, 'Include SHA256 hashes (Very Slow)', false]),
        OptBool.new('SHA512', [false, 'Include SHA512 hashes (Very Slow)', false]),
        OptBool.new('INCREMENTAL', [false, 'Run in incremental mode', true]),
        OptBool.new('WORDLIST', [false, 'Run in wordlist mode', true])
      ]
    )
  end

  def show_command(cracker_instance)
    return unless datastore['ShowCommand']

    if @cracker_type == 'john'
      cmd = cracker_instance.john_crack_command
    elsif @cracker_type == 'hashcat'
      cmd = cracker_instance.hashcat_crack_command
    end
    print_status("   Cracking Command: #{cmd.join(' ')}")
  end

  def check_results(passwords, results, hash_type, method)
    passwords.each do |password_line|
      password_line.chomp!
      next if password_line.blank?

      fields = password_line.split(':')
      cred = { 'hash_type' => hash_type, 'method' => method }

      if @cracker_type == 'john'
        next unless fields.count >= 3 # If we don't have an expected minimum number of fields, this is probably not a hash line

        cred['username'] = fields.shift
        cred['core_id'] = fields.pop
        4.times { fields.pop } # Get rid of extra :
        cred['password'] = fields.join(':') # Anything left must be the password. This accounts for passwords with semi-colons in it
      elsif @cracker_type == 'hashcat'
        next unless fields.count >= 2 # If we don't have an expected minimum number of fields, this is probably not a hash line

        cred['core_id'] = fields.shift
        cred['hash'] = fields.shift
        cred['password'] = fields.join(':') # Anything left must be the password. This accounts for passwords with semi-colons in it
        next if cred['core_id'].include?("Hashfile '") && cred['core_id'].include?("' on line ") # skip error lines

        # we don't have the username since we overloaded it with the core_id (since its a better fit for us)
        # so we can now just go grab the username from the DB
        cred['username'] = framework.db.creds(workspace: myworkspace, id: cred['core_id'])[0].public.username
      end
      results = process_cracker_results(results, cred)
    end

    results
  end

  def run
    tbl = cracker_results_table
    cracker = new_password_cracker(action.name)
    if action.name == 'auto'
      @cracker_type = cracker.get_type
    else
      @cracker_type = action.name
    end

    # array of hashes in jtr_format in the db, converted to an OR combined regex
    hash_types_to_crack = []
    hash_types_to_crack << 'md5crypt' if datastore['MD5']
    hash_types_to_crack << 'descrypt' if datastore['DES']
    hash_types_to_crack << 'bsdicrypt' if datastore['BSDI']
    hash_types_to_crack << 'bcrypt' if datastore['BLOWFISH']
    hash_types_to_crack << 'sha256crypt' if datastore['SHA256']
    hash_types_to_crack << 'sha512crypt' if datastore['SHA512']

    jobs_to_do = []

    # build our job list
    hash_types_to_crack.each do |hash_type|
      job = hash_job(hash_type, @cracker_type)
      if job.nil?
        print_status("No #{hash_type} found to crack")
      else
        jobs_to_do << job
      end
    end

    # bail early of no jobs to do
    if jobs_to_do.empty?
      print_good("No uncracked password hashes found for: #{hash_types_to_crack.join(', ')}")
      return
    end

    # array of arrays for cracked passwords.
    # Inner array format: db_id, hash_type, username, password, method_of_crack
    results = []

    # generate our wordlist and close the file handle.
    wordlist = wordlist_file
    unless wordlist
      print_error('This module cannot run without a database connected. Use db_connect to connect to a database.')
      return
    end

    wordlist.close
    print_status "Wordlist file written out to #{wordlist.path}"

    cleanup_files = [wordlist.path]
    jobs_to_do.each do |job|
      format = job['type']
      hash_file = Rex::Quickfile.new("hashes_#{job['type']}_")
      hash_file.puts job['formatted_hashlist']
      hash_file.close
      cracker.hash_path = hash_file.path
      cleanup_files << hash_file.path

      # dupe our original cracker so we can safely change options between each run
      cracker_instance = cracker.dup
      cracker_instance.format = format

      if @cracker_type == 'john'
        cracker_instance.fork = datastore['FORK']
      end

      # first check if anything has already been cracked so we don't report it incorrectly
      print_status "Checking #{format} hashes already cracked..."
      results = check_results(cracker_instance.each_cracked_password, results, format, 'Already Cracked/POT')
      vprint_good(append_results(tbl, results)) unless results.empty?
      job['cred_ids_left_to_crack'] = job['cred_ids_left_to_crack'] - results.map { |i| i[0].to_i } # remove cracked hashes from the hash list
      next if job['cred_ids_left_to_crack'].empty?

      if @cracker_type == 'john'
        print_status "Cracking #{format} hashes in single mode..."
        cracker_instance.mode_single(wordlist.path)
        show_command cracker_instance
        cracker_instance.crack do |line|
          vprint_status line.chomp
        end
        results = check_results(cracker_instance.each_cracked_password, results, format, 'Single')
        vprint_good(append_results(tbl, results)) unless results.empty?
        job['cred_ids_left_to_crack'] = job['cred_ids_left_to_crack'] - results.map { |i| i[0].to_i } # remove cracked hashes from the hash list
        next if job['cred_ids_left_to_crack'].empty?

        print_status "Cracking #{format} hashes in normal mode..."
        cracker_instance.mode_normal
        show_command cracker_instance
        cracker_instance.crack do |line|
          vprint_status line.chomp
        end
        results = check_results(cracker_instance.each_cracked_password, results, format, 'Normal')
        vprint_good(append_results(tbl, results)) unless results.empty?
        job['cred_ids_left_to_crack'] = job['cred_ids_left_to_crack'] - results.map { |i| i[0].to_i } # remove cracked hashes from the hash list
        next if job['cred_ids_left_to_crack'].empty?
      end

      if datastore['INCREMENTAL']
        print_status "Cracking #{format} hashes in incremental mode..."
        cracker_instance.mode_incremental
        show_command cracker_instance
        cracker_instance.crack do |line|
          vprint_status line.chomp
        end
        results = check_results(cracker_instance.each_cracked_password, results, format, 'Incremental')
        vprint_good(append_results(tbl, results)) unless results.empty?
        job['cred_ids_left_to_crack'] = job['cred_ids_left_to_crack'] - results.map { |i| i[0].to_i } # remove cracked hashes from the hash list
        next if job['cred_ids_left_to_crack'].empty?
      end

      next unless datastore['WORDLIST']

      print_status "Cracking #{format} hashes in wordlist mode..."
      cracker_instance.mode_wordlist(wordlist.path)
      # Turn on KoreLogic rules if the user asked for it
      if @cracker_type == 'john' && datastore['KORELOGIC']
        cracker_instance.rules = 'KoreLogicRules'
        print_status 'Applying KoreLogic ruleset...'
      end
      show_command cracker_instance
      cracker_instance.crack do |line|
        vprint_status line.chomp
      end

      results = check_results(cracker_instance.each_cracked_password, results, format, 'Wordlist')
      vprint_good(append_results(tbl, results)) unless results.empty?
      job['cred_ids_left_to_crack'] = job['cred_ids_left_to_crack'] - results.map { |i| i[0].to_i } # remove cracked hashes from the hash list
      next if job['cred_ids_left_to_crack'].empty?
    end

    # give a final print of results
    print_good(append_results(tbl, results))

    if datastore['DeleteTempFiles']
      cleanup_files.each do |f|
        File.delete(f)
      end
    end
  end
end