Module: Msf::Exploit::Remote::AFP

Includes:
Tcp
Defined in:
lib/msf/core/exploit/afp.rb

Instance Method Summary collapse

Methods included from Tcp

#chost, #cleanup, #connect, #connect_timeout, #cport, #disconnect, #handler, #lhost, #lport, #proxies, #rhost, #rport, #set_tcp_evasions, #ssl, #ssl_version

Instance Method Details

#close_sessionObject


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# File 'lib/msf/core/exploit/afp.rb', line 106

def close_session
  packet =  "\00"              # Flag: Request
  packet << "\x01"             # Command: DSICloseSession
  packet << [@id].pack('n')    # requestID
  packet << "\x00\x00\x00\x00" #Data offset
  packet << "\x00\x00\x00\x00" #Length
  packet << "\x00\x00\x00\x00" #Reserved

  sock.put(packet)
  @id += 1
end

#get_body(packet, body_length) ⇒ Object


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# File 'lib/msf/core/exploit/afp.rb', line 254

def get_body(packet, body_length)
  body = packet[16..body_length + 15]
  raise "AFP #{rhost}:#{rport} Invalid body length" if body.length != body_length
  return body
end

#get_infoObject


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# File 'lib/msf/core/exploit/afp.rb', line 20

def get_info
  packet =  "\00"    # Flag: Request
  packet << "\x03"   # Command: FPGetSrvrInfo
  packet << [@id].pack('n') # requestID
  packet << "\x00\x00\x00\x00" #Data offset
  packet << "\x00\x00\x00\x00" #Length
  packet << "\x00\x00\x00\x00" #Reserved

  sock.put(packet)
  @id += 1

  response = sock.timed_read(1024)
  return parse_info_response(response)
end

#initialize(info = {}) ⇒ Object


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# File 'lib/msf/core/exploit/afp.rb', line 10

def initialize(info={})
  super

  @id = 1
  register_options(
    [
      Opt::RPORT(548)
    ], Msf::Exploit::Remote::AFP)
end

#login(user, pass) ⇒ Object


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# File 'lib/msf/core/exploit/afp.rb', line 53

def (user, pass)
  if user == ''
    return 
  end

  p = OpenSSL::BN.new("BA2873DFB06057D43F2024744CEEE75B", 16)
  g = OpenSSL::BN.new("7", 10)
  ra = OpenSSL::BN.new('86F6D3C0B0D63E4B11F113A2F9F19E3BBBF803F28D30087A1450536BE979FD42', 16)
  ma = g.mod_exp(ra, p)

  padded_user = (user.length + 1) % 2 != 0 ? user + "\x00" : user
  bin_user = [padded_user.length, padded_user].pack("Ca*")

  length = 18 + bin_user.length + ma.to_s(2).length

  packet =  "\00"              # Flag: Request
  packet << "\x02"             # Command: DSICommand
  packet << [@id].pack('n')    # requestID
  packet << "\x00\x00\x00\x00" # Data offset
  packet << [length].pack('N') # Length (42)
  packet << "\x00\x00\x00\x00" # Reserved
  packet << "\x12"             # AFPCommand: FPLogin (18)
  packet << "\x06\x41\x46\x50\x33\x2e\x31" # AFPVersion: AFP3.1
  packet << "\x09\x44\x48\x43\x41\x53\x54\x31\x32\x38" #UAM: DHCAST128
  packet << bin_user            # username
  packet << ma.to_s(2)         # random number

  sock.put(packet)
  @id += 1

  begin
    start = Time.now
    response = sock.timed_read(1024, datastore['LoginTimeOut'])
  rescue Timeout::Error
    vprint_error("AFP #{rhost}:#{rport} Login timeout (AFP server delay response for 20 - 22 seconds after 7 incorrect logins)")
    return :connection_error
  end

  flags, command, request_id, error_code, length, reserved = parse_header(response)

  case error_code
  when -5001 #kFPAuthContinue
    return (response, {:p => p, :g => g, :ra => ra, :ma => ma,
      :password => pass, :user => user})
  when -5023 #kFPUserNotAuth (User dosen't exists)
    print_status("AFP #{rhost}:#{rport} User #{user} dosen't exists")
    return :skip_user
  else
    return :connection_error
  end

end

#no_user_authent_loginObject


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# File 'lib/msf/core/exploit/afp.rb', line 118

def 
  packet =  "\00"              # Flag: Request
  packet << "\x02"             # Command: DSICommand
  packet << [@id].pack('n')    # requestID
  packet << "\x00\x00\x00\x00" # Data offset
  packet << "\x00\x00\x00\x18" # Length (24)
  packet << "\x00\x00\x00\x00" # Reserved
  packet << "\x12"             # AFPCommand: FPLogin (18)
  packet << "\x06\x41\x46\x50\x33\x2e\x31" #AFP3.1
  packet << "\x0f\x4e\x6f\x20\x55\x73\x65\x72\x20\x41\x75\x74\x68\x65\x6e\x74" #UAM: No User Authent

  sock.put(packet)
  @id += 1

  begin
    response = sock.timed_read(1024, datastore['LoginTimeOut'])
  rescue Timeout::Error
    vprint_error("AFP #{rhost}:#{rport} Login timeout (AFP server delay response for 20 - 22 seconds after 7 incorrect logins)")
    return :connection_error
  end

  flags, command, request_id, error_code, length, reserved = parse_header(response)

  if error_code == 0
    return :true
  else
    return false
  end
end

#open_sessionObject


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# File 'lib/msf/core/exploit/afp.rb', line 35

def open_session
  packet =  "\00"              # Flag: Request
  packet << "\x04"             # Command: DSIOpenSession
  packet << [@id].pack('n')    # requestID
  packet << "\x00\x00\x00\x00" #Data offset
  packet << "\x00\x00\x00\x06" #Length
  packet << "\x00\x00\x00\x00" #Reserved
  packet << "\x01"             # Attention Quantum
  packet << "\x04"             # Length
  packet << "\x00\x00\x04\x00" # 1024

  sock.put(packet)
  @id += 1

  response = sock.timed_read(1024)
  return parse_open_session_response(response)
end

#parse_flags(flags) ⇒ Object


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# File 'lib/msf/core/exploit/afp.rb', line 310

def parse_flags(flags)
  flags = flags.to_s(2)
  result = {}
  result['Super Client'] = flags[0,1] == '1' ? true : false
  result['UUIDs'] = flags[5,1] == '1' ? true : false
  result['UTF8 Server Name'] = flags[6,1] == '1' ? true : false
  result['Open Directory'] = flags[7,1] == '1' ? true : false
  result['Reconnect'] = flags[8,1] == '1' ? true : false
  result['Server Notifications'] = flags[9,1] == '1' ? true : false
  result['TCP/IP'] = flags[10,1] == '1' ? true : false
  result['Server Signature'] = flags[11,1] == '1' ? true : false
  result['Server Messages'] = flags[12,1] == '1' ? true : false
  result['Password Saving Prohibited'] = flags[13,1] == '1' ? true : false
  result['Password Changing'] = flags[14,1] == '1' ? true : false
  result['Copy File'] = flags[5,1] == '1' ? true : false
  return result
end

#parse_header(packet) ⇒ Object


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# File 'lib/msf/core/exploit/afp.rb', line 248

def parse_header(packet)
  header = packet.unpack('CCnNNN') #ruby 1.8.7 don't support unpacking signed integers in big-endian order
  header[3] = packet[4..7].reverse.unpack("l").first
  return header
end

#parse_info_response(response) ⇒ Object


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# File 'lib/msf/core/exploit/afp.rb', line 210

def parse_info_response(response)
  parsed_data = {}

  flags, command, request_id, error_code, length, reserved = parse_header(response)
  raise "AFP #{rhost}:#{rport} Server response with error" if error_code != 0
  body = get_body(response, length)
  machine_type_offset, afp_versions_offset, uam_count_offset, icon_offset, server_flags =
  body.unpack('nnnnn')

  server_name_length = body.unpack('@10C').first
  parsed_data[:server_name] = body.unpack("@11A#{server_name_length}").first

  pos = 11 + server_name_length
  pos += 1 if pos % 2 != 0 #padding

  server_signature_offset, network_addresses_offset, directory_names_offset,
  utf8_servername_offset = body.unpack("@#{pos}nnnn")

  parsed_data[:machine_type] = read_pascal_string(body, machine_type_offset)
  parsed_data[:versions] = read_array(body, afp_versions_offset)
  parsed_data[:uams] = read_array(body, uam_count_offset)
  # skiped icon
  parsed_data[:server_flags] = parse_flags(server_flags)
  parsed_data[:signature] = body.unpack("@#{server_signature_offset}H32").first

  network_addresses = read_array(body, network_addresses_offset, true)
  parsed_data[:network_addresses] = parse_network_addresses(network_addresses)
  # skiped directory names
  #Error catching for offset issues on this field. Need better error ahndling all through here
  begin
    parsed_data[:utf8_server_name] = read_utf8_pascal_string(body, utf8_servername_offset)
  rescue
    parsed_data[:utf8_server_name] = "N/A"
  end

  return parsed_data
end

#parse_login_response_add_send_login_count(response, data) ⇒ Object


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# File 'lib/msf/core/exploit/afp.rb', line 148

def (response, data)
  dhx_s2civ = 'CJalbert'
  dhx_c2civ = 'LWallace'

  flags, command, request_id, error_code, length, reserved = parse_header(response)
  body = get_body(response, length)
  id, mb, enc_data = body.unpack("nH32a*")

  mb = OpenSSL::BN.new(mb, 16)
  k = mb.mod_exp(data[:ra], data[:p] )

  cipher = OpenSSL::Cipher.new('cast5-cbc').decrypt
  cipher.key = k.to_s(2)
  cipher.iv = dhx_s2civ
  cipher.padding = 0

  nonce = cipher.update(enc_data)
  nonce << cipher.final
  nonce = nonce[0..15]
  nonce = OpenSSL::BN.new(nonce, 2) + 1

  plain_text = nonce.to_s(2) + data[:password].ljust(64, "\x00")
  cipher = OpenSSL::Cipher.new('cast5-cbc').encrypt
  cipher.key = k.to_s(2)
  cipher.iv = dhx_c2civ
  auth_response = cipher.update(plain_text)
  auth_response << cipher.final

  packet =  "\00"              # Flag: Request
  packet << "\x02"             # Command: DSICommand
  packet << [@id].pack('n')    # requestID
  packet << "\x00\x00\x00\x00" # Data offset
  packet << [auth_response.length + 2].pack("N")  # Length
  packet << "\x00\x00\x00\x00" # Reserved
  packet << "\x13"             # AFPCommand: FPLoginCont (19)
  packet << "\x00"
  packet << [id].pack('n')
  packet << auth_response

  sock.put(packet)
  @id += 1

  begin
    response = sock.timed_read(1024, datastore['LoginTimeOut'])
  rescue Timeout::Error
    vprint_error("AFP #{rhost}:#{rport} Login timeout (AFP server delay response for 20 - 22 seconds after 7 incorrect logins)")
    return :connection_error
  end

  flags, command, request_id, error_code, length, reserved = parse_header(response)
  if error_code == 0
    return true
  else
    return false
  end
end

#parse_network_addresses(network_addresses) ⇒ Object


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# File 'lib/msf/core/exploit/afp.rb', line 283

def parse_network_addresses(network_addresses)
  parsed_addreses = []
  network_addresses.each do |address|
    case address.unpack('C').first
    when 0 #Reserved
      next
    when 1 # Four-byte IP address
      parsed_addreses << IPAddr.ntop(address[1..4]).to_s
    when 2 # Four-byte IP address followed by a two-byte port number
      parsed_addreses <<  "#{IPAddr.ntop(address[1..4])}:#{address[5..6].unpack("n").first}"
    when 3 # DDP address (depricated)
      next
    when 4 # DNS name (maximum of 254 bytes)
      parsed_addreses << address[1..address.length - 1]
    when 5 # This functionality is deprecated.
      next
    when 6 # IPv6 address (16 bytes)
      parsed_addreses << "[#{IPAddr.ntop(address[1..16])}]"
    when 7 # IPv6 address (16 bytes) followed by a two-byte port number
      parsed_addreses << "[#{IPAddr.ntop(address[1..16])}]:#{address[17..18].unpack("n").first}"
    else   # Something wrong?
      raise "Error parsing network addresses"
    end
  end
  return parsed_addreses
end

#parse_open_session_response(response) ⇒ Object


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# File 'lib/msf/core/exploit/afp.rb', line 205

def parse_open_session_response(response)
  flags, command, request_id, error_code, length, reserved = parse_header(response)
  return error_code == 0 ? true : false
end

#read_array(str, offset, afp_network_address = false) ⇒ Object


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# File 'lib/msf/core/exploit/afp.rb', line 270

def read_array(str, offset, afp_network_address=false)
  size = str.unpack("@#{offset}C").first
  pos = offset + 1

  result = []
  size.times do
    result << read_pascal_string(str, pos)
    pos += str.unpack("@#{pos}C").first
    pos += 1 unless afp_network_address
  end
  return result
end

#read_pascal_string(str, offset) ⇒ Object


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# File 'lib/msf/core/exploit/afp.rb', line 260

def read_pascal_string(str, offset)
  length = str.unpack("@#{offset}C").first
  return str.unpack("@#{offset + 1}A#{length}").first
end

#read_utf8_pascal_string(str, offset) ⇒ Object


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# File 'lib/msf/core/exploit/afp.rb', line 265

def read_utf8_pascal_string(str, offset)
  length = str.unpack("@#{offset}n").first
  return str[offset + 2..offset + length + 1]
end