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1# SECUREAUTH LABS. Copyright 2018 SecureAuth Corporation. All rights reserved. 

2# 

3# This software is provided under under a slightly modified version 

4# of the Apache Software License. See the accompanying LICENSE file 

5# for more information. 

6# 

7# Author: Alberto Solino (@agsolino) 

8# 

9# Description: 

10# [MS-BKRP] Interface implementation 

11# 

12# Best way to learn how to use these calls is to grab the protocol standard 

13# so you understand what the call does, and then read the test case located 

14# at https://github.com/SecureAuthCorp/impacket/tree/master/tests/SMB_RPC 

15# 

16# Some calls have helper functions, which makes it even easier to use. 

17# They are located at the end of this file.  

18# Helper functions start with "h"<name of the call>. 

19# There are test cases for them too.  

20# 

21# ToDo: 

22# [ ] 2.2.2 Client-Side-Wrapped Secret 

23from __future__ import division 

24from __future__ import print_function 

25from impacket.dcerpc.v5.ndr import NDRCALL, NDRPOINTER, NDRUniConformantArray 

26from impacket.dcerpc.v5.dtypes import DWORD, NTSTATUS, GUID, RPC_SID, NULL 

27from impacket.dcerpc.v5.rpcrt import DCERPCException 

28from impacket import system_errors 

29from impacket.uuid import uuidtup_to_bin, string_to_bin 

30from impacket.structure import Structure 

31 

32MSRPC_UUID_BKRP = uuidtup_to_bin(('3dde7c30-165d-11d1-ab8f-00805f14db40', '1.0')) 

33 

34class DCERPCSessionError(DCERPCException): 

35 def __init__(self, error_string=None, error_code=None, packet=None): 

36 DCERPCException.__init__(self, error_string, error_code, packet) 

37 

38 def __str__( self ): 

39 key = self.error_code 

40 if key in system_errors.ERROR_MESSAGES: 

41 error_msg_short = system_errors.ERROR_MESSAGES[key][0] 

42 error_msg_verbose = system_errors.ERROR_MESSAGES[key][1] 

43 return 'BKRP SessionError: code: 0x%x - %s - %s' % (self.error_code, error_msg_short, error_msg_verbose) 

44 else: 

45 return 'BKRP SessionError: unknown error code: 0x%x' % self.error_code 

46 

47################################################################################ 

48# CONSTANTS 

49################################################################################ 

50 

51BACKUPKEY_BACKUP_GUID = string_to_bin("7F752B10-178E-11D1-AB8F-00805F14DB40") 

52BACKUPKEY_RESTORE_GUID_WIN2K = string_to_bin("7FE94D50-178E-11D1-AB8F-00805F14DB40") 

53BACKUPKEY_RETRIEVE_BACKUP_KEY_GUID = string_to_bin("018FF48A-EABA-40C6-8F6D-72370240E967") 

54BACKUPKEY_RESTORE_GUID = string_to_bin("47270C64-2FC7-499B-AC5B-0E37CDCE899A") 

55 

56################################################################################ 

57# STRUCTURES 

58################################################################################ 

59class BYTE_ARRAY(NDRUniConformantArray): 

60 item = 'c' 

61 

62class PBYTE_ARRAY(NDRPOINTER): 

63 referent = ( 

64 ('Data', BYTE_ARRAY), 

65 ) 

66 

67# 2.2.4.1 Rc4EncryptedPayload Structure 

68class Rc4EncryptedPayload(Structure): 

69 structure = ( 

70 ('R3', '32s=""'), 

71 ('MAC', '20s=""'), 

72 ('SID', ':', RPC_SID), 

73 ('Secret', ':'), 

74 ) 

75 

76# 2.2.4 Secret Wrapped with Symmetric Key 

77class WRAPPED_SECRET(Structure): 

78 structure = ( 

79 ('SIGNATURE', '<L=1'), 

80 ('Payload_Length', '<L=0'), 

81 ('Ciphertext_Length', '<L=0'), 

82 ('GUID_of_Wrapping_Key', '16s=""'), 

83 ('R2', '68s=""'), 

84 ('_Rc4EncryptedPayload', '_-Rc4EncryptedPayload', 'self["Payload_Length"]'), 

85 ('Rc4EncryptedPayload', ':'), 

86 ) 

87 

88################################################################################ 

89# RPC CALLS 

90################################################################################ 

91# 3.1.4.1 BackuprKey(Opnum 0) 

92class BackuprKey(NDRCALL): 

93 opnum = 0 

94 structure = ( 

95 ('pguidActionAgent', GUID), 

96 ('pDataIn', BYTE_ARRAY), 

97 ('cbDataIn', DWORD), 

98 ('dwParam', DWORD), 

99 ) 

100 

101class BackuprKeyResponse(NDRCALL): 

102 structure = ( 

103 ('ppDataOut', PBYTE_ARRAY), 

104 ('pcbDataOut', DWORD), 

105 ('ErrorCode', NTSTATUS), 

106 ) 

107 

108################################################################################ 

109# OPNUMs and their corresponding structures 

110################################################################################ 

111OPNUMS = { 

112 0 : (BackuprKey, BackuprKeyResponse), 

113} 

114 

115################################################################################ 

116# HELPER FUNCTIONS 

117################################################################################ 

118def hBackuprKey(dce, pguidActionAgent, pDataIn, dwParam=0): 

119 request = BackuprKey() 

120 request['pguidActionAgent'] = pguidActionAgent 

121 request['pDataIn'] = pDataIn 

122 if pDataIn == NULL: 

123 request['cbDataIn'] = 0 

124 else: 

125 request['cbDataIn'] = len(pDataIn) 

126 request['dwParam'] = dwParam 

127 return dce.request(request)