Class: Rex::Proto::SMB::Crypt

Inherits:
Object
  • Object
show all
Defined in:
lib/rex/proto/smb/crypt.rb

Constant Summary collapse

@@loaded_openssl =
false

Class Method Summary collapse

Class Method Details

.is_signature_correct?(mackey, sequence_counter, data) ⇒ Boolean


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# File 'lib/rex/proto/smb/crypt.rb', line 28

def self.is_signature_correct?(mackey, sequence_counter, data)
  signature1 = data[18,8]
  signature2 = sign_smb_packet(mackey, sequence_counter, data.dup)[18,8]
  return signature1 == signature2
end

.sign_smb_packet(mackey, sequence_counter, data) ⇒ Object

Return a signed SMB packet

Raises:


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# File 'lib/rex/proto/smb/crypt.rb', line 18

def self.sign_smb_packet(mackey, sequence_counter, data)
  raise RuntimeError, "No OpenSSL support" if not @@loaded_openssl
  seq = Rex::Text::pack_int64le(sequence_counter)
  netbios_hdr = data.slice!(0,4)
  data[14,8] = seq
  signature = OpenSSL::Digest::MD5.digest(mackey + data)[0,8]
  data[14,8] = signature
  netbios_hdr + data
end