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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 'ruby_smb/dcerpc/client'
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class MetasploitModule < Msf::Auxiliary
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  include Msf::Exploit::Remote::SMB::Client::Authenticated
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  include Msf::Exploit::Remote::DCERPC
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  include Msf::Auxiliary::Report
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  include Msf::Exploit::Remote::MsSamr::Computer
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  include Msf::OptionalSession::SMB
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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' => 'SAMR Computer Management',
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        'Description' => %q{
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          Add, lookup and delete computer / machine accounts via MS-SAMR. By default
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          standard active directory users can add up to 10 new computers to the
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          domain. Administrative privileges however are required to delete the
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          created accounts.
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        },
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        'License' => MSF_LICENSE,
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        'Author' => [
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          'JaGoTu', # @jagotu Original Impacket code
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          'Spencer McIntyre',
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        ],
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        'References' => [
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          ['URL', 'https://github.com/SecureAuthCorp/impacket/blob/master/examples/addcomputer.py'],
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        ],
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        'Notes' => {
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          'Reliability' => [],
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          'Stability' => [],
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          'SideEffects' => [ IOC_IN_LOGS ]
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        },
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        'Actions' => [
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          [ 'ADD_COMPUTER', { 'Description' => 'Add a computer account' } ],
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          [ 'DELETE_COMPUTER', { 'Description' => 'Delete a computer account' } ],
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          [ 'LOOKUP_COMPUTER', { 'Description' => 'Lookup a computer account' } ]
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        ],
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        'DefaultAction' => 'ADD_COMPUTER'
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      )
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    )
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    register_options([
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      OptString.new('COMPUTER_PASSWORD', [ false, 'The password for the new computer' ], conditions: %w[ACTION == ADD_COMPUTER]),
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      Opt::RPORT(445)
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    ])
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  end
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  def run
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    send("action_#{action.name.downcase}")
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  rescue MsSamrConnectionError => e
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    fail_with(Failure::Unreachable, e.message)
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  rescue MsSamrAuthenticationError => e
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    fail_with(Failure::NoAccess, e.message)
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  rescue MsSamrNotFoundError => e
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    fail_with(Failure::NotFound, e.message)
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  rescue MsSamrBadConfigError => e
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    fail_with(Failure::BadConfig, e.message)
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  rescue MsSamrUnexpectedReplyError => e
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    fail_with(Failure::UnexpectedReply, e.message)
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  rescue MsSamrUnknownError => e
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    fail_with(Failure::Unknown, e.message)
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  end
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  def action_add_computer
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    with_ipc_tree do |opts|
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      add_computer(opts)
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    end
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  end
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  def action_delete_computer
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    fail_with(Failure::BadConfig, 'This action requires COMPUTER_NAME to be specified.') if datastore['COMPUTER_NAME'].blank?
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    with_ipc_tree do |opts|
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      delete_computer(opts)
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    end
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  end
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  def action_lookup_computer
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    fail_with(Failure::BadConfig, 'This action requires COMPUTER_NAME to be specified.') if datastore['COMPUTER_NAME'].blank?
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    with_ipc_tree do |opts|
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      lookup_computer(opts)
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    end
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  end
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  # @yieldparam options [Hash] If a SMB session is present, a hash with the IPC tree present. Empty hash otherwise.
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  # @return [void]
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  def with_ipc_tree
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    opts = {}
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    if session
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      print_status("Using existing session #{session.sid}")
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      client = session.client
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      self.simple = ::Rex::Proto::SMB::SimpleClient.new(client.dispatcher.tcp_socket, client: client)
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      opts[:tree] = simple.client.tree_connect("\\\\#{client.dispatcher.tcp_socket.peerhost}\\IPC$")
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    end
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    yield opts
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  ensure
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    opts[:tree].disconnect! if opts[:tree]
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  end
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end
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