-
Notifications
You must be signed in to change notification settings - Fork 0
/
pykms_RequestV5.py
180 lines (139 loc) · 7.84 KB
/
pykms_RequestV5.py
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
#!/usr/bin/env python3
import logging
import binascii
import hashlib
import random
import pykms_Aes as aes
from pykms_Base import kmsBase
from pykms_Structure import Structure
from pykms_Format import justify, byterize, enco, deco, pretty_printer
#--------------------------------------------------------------------------------------------------------------------------------------------------------
loggersrv = logging.getLogger('logsrv')
class kmsRequestV5(kmsBase):
class RequestV5(Structure):
class Message(Structure):
commonHdr = ()
structure = (
('salt', '16s'),
('encrypted', '240s'),
('padding', ':'),
)
commonHdr = ()
structure = (
('bodyLength1', '<I'),
('bodyLength2', '<I'),
('versionMinor', '<H'),
('versionMajor', '<H'),
('message', ':', Message),
)
class DecryptedRequest(Structure):
commonHdr = ()
structure = (
('salt', '16s'),
('request', ':', kmsBase.kmsRequestStruct),
)
class ResponseV5(Structure):
commonHdr = ()
structure = (
('bodyLength1', '<I'),
('unknown', '!I=0x00000200'),
('bodyLength2', '<I'),
('versionMinor', '<H'),
('versionMajor', '<H'),
('salt', '16s'),
('encrypted', ':'),
('padding', ':'),
)
class DecryptedResponse(Structure):
commonHdr = ()
structure = (
('response', ':', kmsBase.kmsResponseStruct),
('keys', '16s'),
('hash', '32s'),
)
key = bytearray([ 0xCD, 0x7E, 0x79, 0x6F, 0x2A, 0xB2, 0x5D, 0xCB, 0x55, 0xFF, 0xC8, 0xEF, 0x83, 0x64, 0xC4, 0x70 ])
v6 = False
ver = 5
def executeRequestLogic(self):
requestData = self.RequestV5(self.data)
decrypted = self.decryptRequest(requestData)
responseBuffer = self.serverLogic(decrypted['request'])
iv, encrypted = self.encryptResponse(requestData, decrypted, responseBuffer)
responseData = self.generateResponse(iv, encrypted, requestData)
return responseData
def decryptRequest(self, request):
encrypted = bytearray(enco(str(request['message']), 'latin-1'))
iv = bytearray(enco(request['message']['salt'], 'latin-1'))
moo = aes.AESModeOfOperation()
moo.aes.v6 = self.v6
decrypted = moo.decrypt(encrypted, 256, moo.ModeOfOperation["CBC"], self.key, moo.aes.KeySize["SIZE_128"], iv)
decrypted = aes.strip_PKCS7_padding(decrypted)
decrypted = bytes(bytearray(decrypted))
return self.DecryptedRequest(decrypted)
def encryptResponse(self, request, decrypted, response):
randomSalt = self.getRandomSalt()
result = hashlib.sha256(randomSalt).digest()
iv = bytearray(enco(request['message']['salt'], 'latin-1'))
randomStuff = bytearray(16)
for i in range(0,16):
randomStuff[i] = (bytearray(enco(decrypted['salt'], 'latin-1'))[i] ^ iv[i] ^ randomSalt[i]) & 0xff
responsedata = self.DecryptedResponse()
responsedata['response'] = response
responsedata['keys'] = bytes(randomStuff)
responsedata['hash'] = result
padded = aes.append_PKCS7_padding(enco(str(responsedata), 'latin-1'))
moo = aes.AESModeOfOperation()
moo.aes.v6 = self.v6
mode, orig_len, crypted = moo.encrypt(padded, moo.ModeOfOperation["CBC"], self.key, moo.aes.KeySize["SIZE_128"], iv)
return bytes(iv), bytes(bytearray(crypted))
def decryptResponse(self, response):
paddingLength = self.getPadding(response['bodyLength1'])
iv = bytearray(enco(response['salt'], 'latin-1'))
encrypted = bytearray(enco(response['encrypted'][:-paddingLength], 'latin-1'))
moo = aes.AESModeOfOperation()
moo.aes.v6 = self.v6
decrypted = moo.decrypt(encrypted, 256, moo.ModeOfOperation["CBC"], self.key, moo.aes.KeySize["SIZE_128"], iv)
decrypted = aes.strip_PKCS7_padding(decrypted)
decrypted = bytes(bytearray(decrypted))
return self.DecryptedResponse(decrypted)
def getRandomSalt(self):
return bytearray(random.getrandbits(8) for i in range(16))
def generateResponse(self, iv, encryptedResponse, requestData):
response = self.ResponseV5()
bodyLength = 2 + 2 + len(iv) + len(encryptedResponse)
response['bodyLength1'] = bodyLength
response['bodyLength2'] = bodyLength
response['versionMinor'] = requestData['versionMinor']
response['versionMajor'] = requestData['versionMajor']
response['salt'] = iv
response['encrypted'] = bytes(bytearray(encryptedResponse))
response['padding'] = bytes(bytearray(self.getPadding(bodyLength)))
pretty_printer(num_text = 16, where = "srv")
response = byterize(response)
loggersrv.info("KMS V%d Response: \n%s\n" % (self.ver, justify(response.dump(print_to_stdout = False))))
loggersrv.info("KMS V%d Structure Bytes: \n%s\n" % (self.ver, justify(deco(binascii.b2a_hex(enco(str(response), 'latin-1')), 'utf-8'))))
return str(response)
def generateRequest(self, requestBase):
esalt = self.getRandomSalt()
moo = aes.AESModeOfOperation()
moo.aes.v6 = self.v6
dsalt = moo.decrypt(esalt, 16, moo.ModeOfOperation["CBC"], self.key, moo.aes.KeySize["SIZE_128"], esalt)
dsalt = bytearray(dsalt)
decrypted = self.DecryptedRequest()
decrypted['salt'] = bytes(dsalt)
decrypted['request'] = requestBase
padded = aes.append_PKCS7_padding(enco(str(decrypted), 'latin-1'))
mode, orig_len, crypted = moo.encrypt(padded, moo.ModeOfOperation["CBC"], self.key, moo.aes.KeySize["SIZE_128"], esalt)
message = self.RequestV5.Message(bytes(bytearray(crypted)))
request = self.RequestV5()
bodyLength = 2 + 2 + len(message)
request['bodyLength1'] = bodyLength
request['bodyLength2'] = bodyLength
request['versionMinor'] = requestBase['versionMinor']
request['versionMajor'] = requestBase['versionMajor']
request['message'] = message
pretty_printer(num_text = 10, where = "clt")
request = byterize(request)
loggersrv.info("Request V%d Data: \n%s\n" % (self.ver, justify(request.dump(print_to_stdout = False))))
loggersrv.info("Request V%d: \n%s\n" % (self.ver, justify(deco(binascii.b2a_hex(enco(str(request), 'latin-1')), 'utf-8'))))
return request