Module: Msf::Exploit::Remote::SMB::Server::HashCapture

Includes:
Auxiliary::Report
Included in:
Share
Defined in:
lib/msf/core/exploit/remote/smb/server/hash_capture.rb

Overview

This mixin provides support for reporting captured SMB creds

Defined Under Namespace

Classes: HashCaptureAuthenticator, HashCaptureNTLMProvider

Instance Method Summary collapse

Methods included from Auxiliary::Report

#active_db?, #create_cracked_credential, #create_credential, #create_credential_and_login, #create_credential_login, #db, #db_warning_given?, #get_client, #get_host, #inside_workspace_boundary?, #invalidate_login, #mytask, #myworkspace, #myworkspace_id, #report_auth_info, #report_client, #report_exploit, #report_host, #report_loot, #report_note, #report_service, #report_vuln, #report_web_form, #report_web_page, #report_web_site, #report_web_vuln, #store_cred, #store_local, #store_loot

Methods included from Metasploit::Framework::Require

optionally, optionally_active_record_railtie, optionally_include_metasploit_credential_creation, #optionally_include_metasploit_credential_creation, optionally_require_metasploit_db_gem_engines

Instance Method Details

#bin_to_hex(str) ⇒ Object


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# File 'lib/msf/core/exploit/remote/smb/server/hash_capture.rb', line 173

def bin_to_hex(str)
  str.each_byte.map { |b| b.to_s(16).rjust(2, '0') }.join
end

#build_jtr_file_name(jtr_format) ⇒ Object


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# File 'lib/msf/core/exploit/remote/smb/server/hash_capture.rb', line 151

def build_jtr_file_name(jtr_format)
  # JTR NTLM hash format NTLMv1
  # Username::Domain:LMHash:NTHash:Challenge
  #
  # JTR NTLM hash format NTLMv2
  # Username::Domain:Challenge:NTHash[0...16]:NTHash[16...-1]

  path = File.expand_path(datastore['JOHNPWFILE'], Msf::Config.install_root)

  # if the passed file name does not contain an extension
  if File.extname(File.basename(path)).empty?
    path += "_#{jtr_format}"
  else
    path_parts = path.split('.')

    # inserts _jtr_format between the last extension and the rest of the path
    path = "#{path_parts[0...-1].join('.')}_#{jtr_format}.#{path_parts[-1]}"
  end

  path
end

#on_ntlm_type3(address:, ntlm_type1:, ntlm_type2:, ntlm_type3:) ⇒ Object


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# File 'lib/msf/core/exploit/remote/smb/server/hash_capture.rb', line 142

def on_ntlm_type3(address:, ntlm_type1:, ntlm_type2:, ntlm_type3:)
  report_ntlm_type3(
    address: address,
    ntlm_type1: ntlm_type1,
    ntlm_type2: ntlm_type2,
    ntlm_type3: ntlm_type3
  )
end

#report_ntlm_type3(address:, ntlm_type1:, ntlm_type2:, ntlm_type3:) ⇒ Object


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# File 'lib/msf/core/exploit/remote/smb/server/hash_capture.rb', line 31

def report_ntlm_type3(address:, ntlm_type1:, ntlm_type2:, ntlm_type3:)
  ntlm_message = ntlm_type3
  hash_type = nil

  user = ntlm_message.user.force_encoding(::Encoding::UTF_16LE).encode(''.encoding)
  domain = ntlm_message.domain.force_encoding(::Encoding::UTF_16LE).encode(''.encoding)
  challenge = [ntlm_type2.challenge].pack('Q<')
  combined_hash = "#{user}::#{domain}"

  case ntlm_message.ntlm_version
  when :ntlmv1, :ntlm2_session
    hash_type = 'NTLMv1-SSP'
    client_hash = "#{bin_to_hex(ntlm_message.lm_response)}:#{bin_to_hex(ntlm_message.ntlm_response)}"

    combined_hash << ":#{client_hash}"
    combined_hash << ":#{bin_to_hex(challenge)}"
    jtr_format = JTR_NTLMV1
  when :ntlmv2
    hash_type = 'NTLMv2-SSP'
    client_hash = "#{bin_to_hex(ntlm_message.ntlm_response[0...16])}:#{bin_to_hex(ntlm_message.ntlm_response[16..-1])}"

    combined_hash << ":#{bin_to_hex(challenge)}"
    combined_hash << ":#{client_hash}"
    jtr_format = JTR_NTLMV2
  end

  return if hash_type.nil?

  jtr_format = ntlm_message.ntlm_version == :ntlmv1 ? JTR_NTLMV1 : JTR_NTLMV2

  if active_db?
    origin = create_credential_origin_service(
      {
        address: address,
        port: datastore['SRVPORT'],
        service_name: 'smb',
        protocol: 'tcp',
        module_fullname: fullname,
        workspace_id: myworkspace_id
      }
    )

    credential_options = {
      origin: origin,
      origin_type: :service,
      address: address,
      port: datastore['SRVPORT'],
      service_name: 'smb',
      username: user,
      server_challenge: challenge,
      client_hash: client_hash,
      # client_os_version: client_os_version,
      private_data: combined_hash,
      private_type: :nonreplayable_hash,
      jtr_format: jtr_format,
      module_fullname: fullname,
      workspace_id: myworkspace_id,
    }
    if domain.present?
      credential_options[:domain] = domain
      credential_options[:realm_key] = Metasploit::Model::Realm::Key::ACTIVE_DIRECTORY_DOMAIN
      credential_options[:realm_value] = domain
    end

    # TODO: Re-implement when +client_os_version+ can be determined.
    # found_host = framework.db.hosts.find_by(address: address)
    # found_host.os_name = credential_options[:client_os_version]
    # found_host.save!

    search_options = {
      realm: credential_options[:realm_value],
      user: credential_options[:username],
      hosts: credential_options[:address],
      jtr_format: credential_options[:jtr_format],
      type: Metasploit::Credential::NonreplayableHash,
      workspace: framework.db.workspace
    }
    if framework.db.creds(search_options).count > 0
      vprint_status("Skipping previously captured hash for #{credential_options[:realm_value]}\\#{credential_options[:username]}")
      return
    end

    create_credential(credential_options)
  end

  # TODO: write method for mapping +major+ and +minor+ OS values to human-readable OS names.
  # client_os_version = ::NTLM::OSVersion.read(type1_msg.os_version)
  print_line "[SMB] #{hash_type} Client     : #{address}"
  # print_line "[SMB] #{hash_type} Client OS  : #{client_os_version}"
  print_line "[SMB] #{hash_type} Username   : #{domain}\\#{user}"
  print_line "[SMB] #{hash_type} Hash       : #{combined_hash}"
  print_line

  if datastore['JOHNPWFILE']
    path = build_jtr_file_name(jtr_format)

    File.open(path, 'ab') do |f|
      f.puts(combined_hash)
    end
  end

  # Cain & Abel doesn't support import of NTLMv2 hashes
  if datastore['CAINPWFILE'] && jtr_format == JTR_NTLMV1
    # Cain&Abel hash format
    # Username:Domain:Challenge:LMHash:NTLMHash
    File.open(File.expand_path(datastore['CAINPWFILE'], Msf::Config.install_root), 'ab') do |f|
      f.puts("#{user}:#{domain}:#{server_challenge}:#{client_hash}")
    end
  end
end

#validate_smb_hash_capture_datastore(datastore, ntlm_provider) ⇒ Object


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# File 'lib/msf/core/exploit/remote/smb/server/hash_capture.rb', line 10

def validate_smb_hash_capture_datastore(datastore, ntlm_provider)
  if datastore['CHALLENGE']
    # Set challenge for all future server responses

    chall = proc { [datastore['CHALLENGE']].pack('H*') }
    ntlm_provider.generate_server_challenge(&chall)
  end

  if datastore['JOHNPWFILE']
    print_status("JTR hashes will be split into two files depending on the hash format.")
    print_status("#{build_jtr_file_name(JTR_NTLMV1)} for NTLMv1 hashes.")
    print_status("#{build_jtr_file_name(JTR_NTLMV2)} for NTLMv2 hashes.")
    print_line
  end

  if datastore['CAINPWFILE']
    print_status("Cain & Abel hashes will be stored at #{File.expand_path(datastore['CAINPWFILE'], Msf::Config.install_root)}")
    print_line
  end
end