-
Notifications
You must be signed in to change notification settings - Fork 7
/
server.py
executable file
·732 lines (620 loc) · 30.2 KB
/
server.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
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
#!/usr/bin/env python3
"""
"""
import udkserver
import gdbserver
import collections
import logging
import select
import serial
#import signal
#import sys
import io
import socket
import ctypes
import pefile
#import macholib
import xml.etree.ElementTree
logging.basicConfig(level=logging.DEBUG)
logger = logging.getLogger()
logger.setLevel(logging.DEBUG)
#### This should be generated from the packaged gdb xmls eventually
# can be viewed in a running gdb with maint remote-registers
registers = {
'rax': udkserver.Register.SOFT_DEBUGGER_REGISTER_AX,
'rbx': udkserver.Register.SOFT_DEBUGGER_REGISTER_BX,
'rcx': udkserver.Register.SOFT_DEBUGGER_REGISTER_CX,
'rdx': udkserver.Register.SOFT_DEBUGGER_REGISTER_DX,
'rsi': udkserver.Register.SOFT_DEBUGGER_REGISTER_SI,
'rdi': udkserver.Register.SOFT_DEBUGGER_REGISTER_DI,
'rbp': udkserver.Register.SOFT_DEBUGGER_REGISTER_BP,
'rsp': udkserver.Register.SOFT_DEBUGGER_REGISTER_SP,
'eax': udkserver.Register.SOFT_DEBUGGER_REGISTER_AX,
'ebx': udkserver.Register.SOFT_DEBUGGER_REGISTER_BX,
'ecx': udkserver.Register.SOFT_DEBUGGER_REGISTER_CX,
'edx': udkserver.Register.SOFT_DEBUGGER_REGISTER_DX,
'esi': udkserver.Register.SOFT_DEBUGGER_REGISTER_SI,
'edi': udkserver.Register.SOFT_DEBUGGER_REGISTER_DI,
'ebp': udkserver.Register.SOFT_DEBUGGER_REGISTER_BP,
'esp': udkserver.Register.SOFT_DEBUGGER_REGISTER_SP,
'r8': udkserver.Register.SOFT_DEBUGGER_REGISTER_R8,
'r9': udkserver.Register.SOFT_DEBUGGER_REGISTER_R9,
'r10': udkserver.Register.SOFT_DEBUGGER_REGISTER_R10,
'r11': udkserver.Register.SOFT_DEBUGGER_REGISTER_R11,
'r12': udkserver.Register.SOFT_DEBUGGER_REGISTER_R12,
'r13': udkserver.Register.SOFT_DEBUGGER_REGISTER_R13,
'r14': udkserver.Register.SOFT_DEBUGGER_REGISTER_R14,
'r15': udkserver.Register.SOFT_DEBUGGER_REGISTER_R15,
'rip': udkserver.Register.SOFT_DEBUGGER_REGISTER_EIP,
'eip': udkserver.Register.SOFT_DEBUGGER_REGISTER_EIP,
'eflags': udkserver.Register.SOFT_DEBUGGER_REGISTER_EFLAGS,
'cs': udkserver.Register.SOFT_DEBUGGER_REGISTER_CS,
'ss': udkserver.Register.SOFT_DEBUGGER_REGISTER_SS,
'ds': udkserver.Register.SOFT_DEBUGGER_REGISTER_DS,
'es': udkserver.Register.SOFT_DEBUGGER_REGISTER_ES,
'fs': udkserver.Register.SOFT_DEBUGGER_REGISTER_FS,
'gs': udkserver.Register.SOFT_DEBUGGER_REGISTER_GS,
'st0': udkserver.Register.SOFT_DEBUGGER_REGISTER_ST0,
'st1': udkserver.Register.SOFT_DEBUGGER_REGISTER_ST1,
'st2': udkserver.Register.SOFT_DEBUGGER_REGISTER_ST2,
'st3': udkserver.Register.SOFT_DEBUGGER_REGISTER_ST3,
'st4': udkserver.Register.SOFT_DEBUGGER_REGISTER_ST4,
'st5': udkserver.Register.SOFT_DEBUGGER_REGISTER_ST5,
'st6': udkserver.Register.SOFT_DEBUGGER_REGISTER_ST6,
'st7': udkserver.Register.SOFT_DEBUGGER_REGISTER_ST7,
'fctrl': udkserver.Register.SOFT_DEBUGGER_REGISTER_FP_FCW,
'fstat': udkserver.Register.SOFT_DEBUGGER_REGISTER_FP_FSW,
'ftag': udkserver.Register.SOFT_DEBUGGER_REGISTER_FP_FTW,
'fiseg': udkserver.Register.SOFT_DEBUGGER_REGISTER_FP_CS,
'fioff': udkserver.Register.SOFT_DEBUGGER_REGISTER_FP_EIP,
'foseg': udkserver.Register.SOFT_DEBUGGER_REGISTER_FP_DS,
'fooff': udkserver.Register.SOFT_DEBUGGER_REGISTER_FP_DATAOFFSET,
'fop': udkserver.Register.SOFT_DEBUGGER_REGISTER_FP_OPCODE,
'xmm0': udkserver.Register.SOFT_DEBUGGER_REGISTER_XMM0,
'xmm1': udkserver.Register.SOFT_DEBUGGER_REGISTER_XMM1,
'xmm2': udkserver.Register.SOFT_DEBUGGER_REGISTER_XMM2,
'xmm3': udkserver.Register.SOFT_DEBUGGER_REGISTER_XMM3,
'xmm4': udkserver.Register.SOFT_DEBUGGER_REGISTER_XMM4,
'xmm5': udkserver.Register.SOFT_DEBUGGER_REGISTER_XMM5,
'xmm6': udkserver.Register.SOFT_DEBUGGER_REGISTER_XMM6,
'xmm7': udkserver.Register.SOFT_DEBUGGER_REGISTER_XMM7,
'xmm8': udkserver.Register.SOFT_DEBUGGER_REGISTER_XMM8,
'xmm9': udkserver.Register.SOFT_DEBUGGER_REGISTER_XMM9,
'xmm10': udkserver.Register.SOFT_DEBUGGER_REGISTER_XMM10,
'xmm11': udkserver.Register.SOFT_DEBUGGER_REGISTER_XMM11,
'xmm12': udkserver.Register.SOFT_DEBUGGER_REGISTER_XMM12,
'xmm13': udkserver.Register.SOFT_DEBUGGER_REGISTER_XMM13,
'xmm14': udkserver.Register.SOFT_DEBUGGER_REGISTER_XMM14,
'xmm15': udkserver.Register.SOFT_DEBUGGER_REGISTER_XMM15,
}
class LoadedImageProtocol(ctypes.Structure):
_fields_ = [('revision', ctypes.c_uint32),
('parent_handle', ctypes.c_uint64),
('system_table', ctypes.c_uint64),
('device_handle', ctypes.c_uint64),
('file_path', ctypes.c_uint64),
('reserved', ctypes.c_uint64),
('load_options_size', ctypes.c_uint32),
('load_options', ctypes.c_uint64),
('image_base', ctypes.c_uint64),
('image_size', ctypes.c_uint64),
('image_code_type', ctypes.c_uint8),
('image_data_type', ctypes.c_uint8),
('image_unload', ctypes.c_uint64)]
class PeCoffLoaderImageContext(ctypes.Structure):
_pdb_name = None
_fields_ = [('image_addr', ctypes.c_ulonglong),
('image_size', ctypes.c_ulonglong),
('destination_address', ctypes.c_ulonglong),
('entrypoint', ctypes.c_ulonglong),
('image_read', ctypes.c_ulonglong),
('handle', ctypes.c_ulonglong),
('fixup_data', ctypes.c_ulonglong),
('section_alignment', ctypes.c_ulong),
('pe_coff_header_offset', ctypes.c_ulong),
('debug_directory_entry_rva', ctypes.c_ulong),
('code_view', ctypes.c_ulonglong),
('pdb_pointer', ctypes.c_ulonglong),
('size_of_headers', ctypes.c_ulonglong),
('image_code_memory_type', ctypes.c_ulong),
('image_data_memory_type', ctypes.c_ulong),
('image_error', ctypes.c_ulong),
('fixup_data_size', ctypes.c_ulonglong),
('machine', ctypes.c_ushort),
('image_type', ctypes.c_ushort),
('relocations_stripped', ctypes.c_bool),
('is_te_image', ctypes.c_bool),
('hii_resource_data', ctypes.c_uint64),
]
@property
def pdb_name(self):
return self._pdb_name
@pdb_name.setter
def pdb_name(self, pdb_name):
self._pdb_name = pdb_name
class GUID(ctypes.Structure):
_pack_ = 1
_fields_ = [('Data1', ctypes.c_uint32),
('Data2', ctypes.c_uint16),
('Data3', ctypes.c_uint16),
('Data4', ctypes.c_uint8 * 8)]
class CodeViewRSDSEntry(ctypes.Structure):
_pack_ = 1
_fields_ = [('Signature', ctypes.c_char * 4),
('GUID', GUID),
('Age', ctypes.c_uint32)]
class LoadedImagePrivateData(ctypes.Structure):
_fields_ = [('signature', ctypes.c_uint64),
('handle', ctypes.c_uint64),
('type', ctypes.c_uint64),
('started', ctypes.c_uint8),
('entrypoint', ctypes.c_uint64),
('info', LoadedImageProtocol),
('loaded_image_device_path', ctypes.c_uint64),
('image_base_page', ctypes.c_uint64),
('number_of_pages', ctypes.c_uint64),
('fixup_data', ctypes.c_uint64),
('tpl', ctypes.c_uint64),
('status', ctypes.c_uint64),
('exit_data_size', ctypes.c_uint64),
('exit_data', ctypes.c_uint64),
('jump_context', ctypes.c_uint64),
('machine', ctypes.c_uint16),
('ebc', ctypes.c_uint64),
('runtime_data', ctypes.c_uint64),
('image_context', PeCoffLoaderImageContext)]
class UdkGdbStub(gdbserver.GdbHostStub):
"""UdkGdbStub - implement a UDK aware GDB stub
This is one half of the UDK GDB server; implementing the non-generic GDB stub specialized to UDK.
This contains functions to call the GDB aware UDK stub, UdkStub. The two modules interact, with this
module mostly responsible for the GDB side of any conversions.
"""
def __init__(self, rsp, udk):
super(UdkGdbStub, self).__init__(rsp)
self.udk = udk
#### UDK Extensions
self.udk_extension_handlers = collections.defaultdict(dict)
self.add_general_query_handler(b'UdkExtension', self.udk_extension)
#### General UDK Extensions
self.add_udk_extension_handlers(b'arch', self.udk_extension_arch)
self.add_udk_extension_handlers(b'checkexpat', self.udk_extension_checkexpat)
self.add_udk_extension_handlers(b'exception', self.udk_extension_exception)
self.add_udk_extension_handlers(b'symbol', self.udk_extension_symbol)
#### Loaded Modules UDK Extension
self.add_udk_extension_handlers(b'fmodules', self.udk_extension_fmodules)
self.add_udk_extension_handlers(b'smodules', self.udk_extension_smodules)
self.add_feature(b'qXfer:features:read', True)
self.add_feature(b'qXfer:libraries:read', True)
self.add_general_query_xfer_handler(b'read', b'features', b'target.xml', self.target_xml)
self.add_general_query_xfer_handler(b'read', b'libraries', b'', self.libraries_xml)
self.reset()
self.udk.connect(self)
def reset(self):
"""Reset
Called when the UDK Target Reboots to re-initialize any transient GDB state
"""
logger.warn("target reset()")
for i, breakpoint in enumerate(self.breakpoints):
if breakpoint.state == gdbserver.BreakpointState.BP_ACTIVE:
breakpoint.state = gdbserver.BreakpointState.BP_SET
breakpoint.first_byte = None
elif breakpoint.state == gdbserver.BreakpointState.BP_REMOVED:
del self.breakpoints[i]
if self.udk.arch == udkserver.CpuArch.DEBUG_DATA_BREAK_CPU_ARCH_IA32:
self.set_architecture('i386')
elif self.udk.arch == udkserver.CpuArch.DEBUG_DATA_BREAK_CPU_ARCH_X64:
self.set_architecture('i386:x86_x64')
self.libraries = xml.etree.ElementTree.Element('library-list')
def add_library(self, library, segment, sections = None):
"""Add Library
Called when the target loads shared library that should be recorded for GDB.
"""
library = xml.etree.ElementTree.SubElement(self.libraries, 'library', name = library)
if not sections:
xml.etree.ElementTree.SubElement(library, 'segment', address='0x{0:x}'.format(segment))
else:
for section in sections:
xml.etree.ElementTree.SubElement(library, 'section', address='0x{0:x}'.format(section.address))
def target_xml(self):
target = xml.etree.ElementTree.Element('target', version='1.0')
architecture = xml.etree.ElementTree.SubElement(target, 'architecture')
architecture.text = self.architecture
return xml.etree.ElementTree.tostring(target, encoding='utf-8', method='xml')
def libraries_xml(self):
return xml.etree.ElementTree.tostring(self.libraries, encoding='utf-8', method='xml')
def ensure_breakpoints(self):
for i, breakpoint in enumerate(self.breakpoints):
if breakpoint.state == gdbserver.BreakpointState.BP_SET:
first_byte = self.udk.read_memory(breakpoint.address, 1, 1)
if first_byte != b'\xcc':
breakpoint.first_byte = first_byte
breakpoint.state = gdbserver.BreakpointState.BP_ACTIVE
self.udk.write_memory(breakpoint.address, 1, 1, b'\xcc')
elif breakpoint.state == gdbserver.BreakpointState.BP_ACTIVE:
first_byte = self.udk.read_memory(breakpoint.address, 1, 1)
if first_byte != b'\xcc':
logger.warn("breakpoint marked active but no deployed")
breakpoint.state = gdbserver.BreakpointState.BP_SET
elif breakpoint.state == gdbserver.BreakpointState.BP_REMOVED:
first_byte = self.udk.read_memory(breakpoint.address, 1, 1)
if first_byte != b'\xcc':
logger.warn("breakpoint marked removed but not active")
elif breakpoint.first_byte:
self.udk.write_memory(breakpoint.address, 1, 1, breakpoint.first_byte)
logger.warn("breakpoint marked removed but not active")
del self.breakpoints[i]
##### GDB Target Stub Side
### Called by GDB to request the target continue execution
def continue_execution_impl(self, address = None):
self.ensure_breakpoints()
self.udk.go()
def continue_execution_with_signal_impl(self, signal, addr):
if signal == 9:
self.udk.reset()
return True
self.ensure_breakpoints()
self.udk.go()
def detach_impl(self):
self.udk.detach()
return False
### Called by GDB to request the break cause from the target
def halt_reason_impl(self):
return self.udk.handle_break_cause()
def insert_breakpoint_impl(self, index, address, kind):
logger.info("adding breakpoint: index: {}, address: {}".format(index, address))
for breakpoint in self.breakpoints:
if breakpoint.address == address:
return
breakpoint = gdbserver.Breakpoint(address)
breakpoint.state = gdbserver.BreakpointState.BP_SET
self.breakpoints.append(breakpoint)
def kill_impl(self):
self.udk.reset()
def remove_breakpoint_impl(self, index, address, kind):
logger.info("removing breakpoint: index: {}, address: {}".format(index, address))
for breakpoint in self.breakpoints:
if breakpoint.address == address:
breakpoint.state = gdbserver.BreakpointState.BP_REMOVED
self.ensure_breakpoints()
### Called by GDB to request memory from the target
def read_memory_impl(self, address, size):
return self.udk.read_memory(address, 1, size)
### Called by GDB to request a single register from the target
def read_register_impl(self, register):
return self.udk.read_register(registers[register])
### Called by GDB to read the register state from the target
def read_registers_impl(self, defaults):
registers = self.udk.read_registers()
# gdb has different register names to UDK; translate
registers['fctrl'] = registers['fcw']
registers['fstat'] = registers['fsw']
registers['ftag'] = registers['ftw']
registers['fiseg'] = registers['fcs']
registers['fioff'] = registers['fpu_ip']
registers['foseg'] = registers['fds']
registers['fooff'] = registers['fpu_dp']
registers['st0'] = registers['st0mm0']
registers['st1'] = registers['st1mm1']
registers['st2'] = registers['st2mm2']
registers['st3'] = registers['st3mm3']
registers['st4'] = registers['st4mm4']
registers['st5'] = registers['st5mm5']
registers['st6'] = registers['st6mm6']
registers['st7'] = registers['st7mm7']
del registers['fcw']
del registers['fsw']
del registers['ftw']
del registers['fcs']
del registers['fpu_ip']
del registers['fds']
del registers['fpu_dp']
del registers['st0mm0']
del registers['st1mm1']
del registers['st2mm2']
del registers['st3mm3']
del registers['st4mm4']
del registers['st5mm5']
del registers['st6mm6']
del registers['st7mm7']
return registers
### Called by GDB to halt the target from running
def send_break_impl(self):
self.udk.halt()
return self.udk.handle_break_cause()
### Called by GDB to request the target step a single instruction
def step_instruction_impl(self):
self.ensure_breakpoints()
self.udk.single_stepping()
return self.udk.handle_break_cause()
### Called by GDB to request the target step a single instruction
def step_instruction_with_signal_impl(self, signal, addr):
if signal == 9:
self.udk.reset()
self.ensure_breakpoints()
self.udk.single_stepping()
return self.udk.handle_break_cause()
### Called by GDB to write memory on the target
def write_memory_impl(self, address, size, data):
return self.udk.write_memory(address, 1, size, data)
def write_register_impl(self, register_name, value):
return self.udk.write_register(registers[register_name], value)
#### GDB Protocol Extensions for UDK
###
def add_udk_extension_handlers(self, command, handler):
self.udk_extension_handlers[command] = handler
def udk_extension(self, args):
cmd = args
args = None
if b':' in cmd:
cmd, args = cmd.split(b':', 2)
try:
self.udk_extension_handlers[cmd](args)
except KeyError:
self.rsp.send_packet(b'')
def udk_extension_arch(self, args):
if self.udk.arch == udkserver.CpuArch.DEBUG_DATA_BREAK_CPU_ARCH_IA32:
self.set_architecture('i386')
elif self.udk.arch == udkserver.CpuArch.DEBUG_DATA_BREAK_CPU_ARCH_X64:
self.set_architecture('i386:x86_x64')
self.rsp.send_packet(self.architecture.encode('utf-8'))
def udk_extension_exception(self, args):
(vector, error_code) = self.udk.get_exception()
msg = '{0:x};{1:x}'.format(vector, error_code)
self.rsp.send_packet(msg.encode('utf-8'))
def udk_extension_next_module(self):
try:
first = next(self.libraries_iter)
msg = '0x{0:x};0x{1:x};{2}'.format(first['image_context'].entrypoint,
first['image_context'].image_addr,
first['pdb_name'])
self.rsp.send_packet(msg.encode('utf-8'))
except StopIteration:
self.rsp.send_packet(b'l')
del self.libraries_iter
except AttributeError:
self.rsp.send_packet(b'l')
def udk_extension_fmodules(self, args):
self.libraries_iter = iter(self.udk.libraries)
self.udk_extension_next_module()
def udk_extension_smodules(self, args):
if not hasattr(self, 'libraries_iter'):
self.rsp.send_packet(b'E99')
self.udk_extension_next_module()
def udk_extension_symbol(self, args):
address = int(args, 0)
(pdb_name, image_addr, sections) = self.udk.symbol(address)
if pdb_name is None:
self.rsp.send_packet(b'E91')
return
msg = '{0};0x{1:x}'.format(pdb_name.decode('utf-8'), image_addr)
text_sections = []
for section in sections:
text_sections.append('{0}=0x{1:x}'.format(section['name'].decode('utf-8'), section['address']))
msg = msg + ';' + ';'.join(text_sections)
# logger.debug(msg)
self.rsp.send_packet(msg.encode('utf-8'))
def udk_extension_checkexpat(self, args):
if args == b'start':
self.rsp.send_packet(b'OK')
else:
self.rsp.send_packet(b'E91')
class UdkStub(udkserver.UdkTargetStub):
def __init__(self, target, server):
super(UdkStub, self).__init__(target)
self.images = {}
self.server = server
self.libraries = []
self.gdb = None
def connect(self, gdb):
self.gdb = gdb
for library in self.libraries:
self.gdb.add_library(library['pdb_name'], library['text_section'], library['sections'])
def search_image(self, address):
image_search_start = address & 0xfffffffffffff000;
image_search_end = image_search_start - 0x80000
if image_search_end < 0:
image_search_end = 0
image_search = image_search_start
# Max go back 512K
while image_search > image_search_end:
header = self.read_memory(image_search, 1, 2)
if header == b'VZ' or header == b'MZ':
# logger.debug(str(header))
return image_search
image_search = image_search - 0x1000
return None
def obtain_image(self, image_address):
peheader = self.read_memory(image_address, 1, 0x600)
pe = pefile.PE(data = peheader, fast_load = True)
directory_index = pefile.DIRECTORY_ENTRY['IMAGE_DIRECTORY_ENTRY_DEBUG']
dir_entry = pe.OPTIONAL_HEADER.DATA_DIRECTORY[directory_index]
peheader += b'\0' * (dir_entry.VirtualAddress - 0x600)
peheader += self.read_memory(image_address + dir_entry.VirtualAddress, 1, dir_entry.Size)
return peheader
def symbol(self, address):
image_address = self.search_image(address)
if image_address is None:
return (None, None, None)
if not image_address in self.images:
self.images[image_address] = self.obtain_image(image_address)
image_data = self.images[image_address]
# logger.debug('found PE32 image signature at: 0x{0:x}'.format(image_address))
pdb_name = b''
sections = []
try:
pe = pefile.PE(data = image_data, fast_load = True)
pe.parse_data_directories(pefile.DIRECTORY_ENTRY['IMAGE_DIRECTORY_ENTRY_DEBUG'])
# logger.debug(pe.dump_info())
for pesection in pe.sections:
sections.append({'name': pesection.Name.strip(b'\x00'),
'address': pesection.VirtualAddress + pe.OPTIONAL_HEADER.ImageBase})
try:
for entry in pe.DIRECTORY_ENTRY_DEBUG:
if entry.struct.Type == 2: # IMAGE TYPE CODEVIEW
off = entry.struct.PointerToRawData
size = entry.struct.SizeOfData
data = image_data[off:off+size]
cv = CodeViewRSDSEntry.from_buffer_copy(data)
if (cv.Signature == b'MTOC'):
pdb_name = data[20:].strip(b'\x00')
elif (cv.Signature == b'RSDS'):
pdb_name = data[24:].strip(b'\x00')
else:
logger.warn('Unknown debug signature {0:s}'.format(cv.Signature))
except AttributeError:
pdb_name = b'NoDebugData'
pass
except pefile.PEFormatError:
pass
return (pdb_name, image_address, sections)
##### UDK Host Side
def handle_init_break(self, packet):
super(UdkStub, self).handle_init_break(packet)
self.server.start_socket()
### Called by UDK Server when memory is ready on the target
def handle_memory_ready_impl(self):
self.libraries = []
self.images = {}
# self.server.start_socket()
if self.gdb:
self.gdb.reset()
### Called by UDK Server when memory is ready on the target
def handle_break_point_impl(self):
(cause, nr) = self.handle_break_cause()
self.gdb.rsp.send_stop_reply_packet(cause, nr)
### Called to generate a response when the target is stopped at a SW breakpoint
def handle_break_cause_sw_breakpoint_impl(self, stop_address):
logger.debug('swbreak caused stop at address 0x{0:x}'.format(stop_address))
return (5, {b'swbreak': b''})
### Called to generate a response when the target is stopped at a SW breakpoint
def handle_break_cause_hw_breakpoint_impl(self, stop_address):
return (5, {b'hwbreak': b''})
### Called to generate a response when the target is stopped due to image loading
def handle_break_cause_image_load_impl(self, pdb_name_addr, image_context_addr):
loaded_image_private_data_addr = image_context_addr - LoadedImagePrivateData.image_context.offset;
loaded_image_private_data_buffer = self.read_memory(loaded_image_private_data_addr, 1, 512)
loaded_image_private_data = LoadedImagePrivateData.from_buffer_copy(loaded_image_private_data_buffer)
image_context = loaded_image_private_data.image_context
# logger.debug('signature: 0x{0:x}'.format(loaded_image_private_data.signature))
if loaded_image_private_data.signature == 0x6972646c:
logger.debug('EDK_LOADED_IMAGE_PRIVATE_DATA:')
logger.info('signature: 0x{0:x} entrypoint: 0x{1:x}, image_base_page: 0x{2:x}, number_of_pages: 0x{3:x}'
.format(loaded_image_private_data.signature,
loaded_image_private_data.entrypoint,
loaded_image_private_data.image_base_page,
loaded_image_private_data.number_of_pages))
logger.debug('EFI_LOADED_IMAGE_PROTOCOL:')
logger.info('revision: 0x{0:x} image_base: 0x{1:x}, image_size: 0x{2:x}'
.format(loaded_image_private_data.info.revision,
loaded_image_private_data.info.image_base,
loaded_image_private_data.info.image_size))
if image_context.image_addr == 0x0:
image_context.image_addr = loaded_image_private_data.info.image_base
if image_context.image_size == 0x0:
image_context.image_size = loaded_image_private_data.info.image_size
if image_context.entrypoint == 0x0:
image_context.entrypoint = loaded_image_private_data.entrypoint
pdb_name = self.read_null_terminated_string(pdb_name_addr)
if pdb_name.endswith('.dll'):
pdb_name = pdb_name[:-4]
if not pdb_name.endswith('.dll'):
pdb_name += '.dll'
logger.info('module {0} loaded at address 0x{1:x} with size 0x{2:x}'.format(pdb_name, image_context.image_addr, image_context.image_size))
### Get .text offset:
# When specifying a segment address, GDB uses segment relocation code.
# Whereas a PE32 has only a single segment, a Mach-O binary has 2 segments:
# .text and .data. So, gdb expects the segment address to be the address of
# the .text segment.
offset = 0
sections = []
peheader = self.read_memory(image_context.image_addr, 1, 1024)
try:
pe = pefile.PE(data = peheader)
for pesection in pe.sections:
if pesection.Name.strip(b'\x00') == b'.text':
offset = pesection.VirtualAddress
# section = gdbserver.Section(pesection.Name.strip(b'\x00'),
# pesection.VirtualAddress + image_context.image_addr,
# pesection.Misc_VirtualSize)
# if section.name == b'.text' or \
# section.name == b'.data':
# sections.append(section)
#
# logger.info('module {0} section {1!s} loaded at address 0x{2:x} with size 0x{3:x}'.format(pdb_name, section.name, image_context.image_addr + section.address, section.length))
except pefile.PEFormatError:
pass
self.libraries.append({'pdb_name': pdb_name,
'image_context': image_context,
'text_section': image_context.image_addr + offset,
'sections': sections})
if self.gdb:
self.gdb.add_library(pdb_name, image_context.image_addr + offset, sections)
return (5, {b'library': b''})
def handle_break_cause_stepping_impl(self, stop_address):
return (5, {})
### Called by UDK Server when a SW breakpoint occurs on the target
def handle_break_cause_exception_impl(self, stop_addres, vector, data):
return (4, {})
class UdkGdbServer():
def __init__(self, serial_name = '/dev/ttyGS0', host = '0.0.0.0', port = 1234):
self._serial_name = serial_name
self._serial = None
self._host = host
self._port = port
self._socket = None
self._poll = select.poll()
self._poll_handlers = {}
self.udk = None
def add_poll_fd(self, fd, handler):
self._poll.register(fd, select.POLLIN)
self._poll_handlers[fd] = handler
def remove_poll_fd(self, fd):
self._poll.unregister(fd)
del self._poll_handlers[fd]
def start_serial(self):
### Initialize the Serial port
self._serial = serial.Serial(self._serial_name)
self._serial.reset_input_buffer()
self._serial.reset_output_buffer()
self.udk = udkserver.UdkTarget(self._serial, UdkStub, self)
self.add_poll_fd(self._serial.fileno(), self.udk.command_communication)
def socket_handler(self):
self.connection, self.remote_addr = self._socket.accept()
self.gdb = gdbserver.GdbRemoteSerialProtocol(self.connection.makefile('rwb', buffering = 0), UdkGdbStub, self.udk.stub)
self.add_poll_fd(self.connection.fileno(), self.gdb.command_communication)
logger.info("Received a connection from {}".format(self.remote_addr))
def start_socket(self):
self._socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
self._socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
self._socket.bind((self._host, self._port))
self._socket.listen(10)
self.add_poll_fd(self._socket.fileno(), self.socket_handler)
logger.info("Listening on {}:{} for connections".format(self._host, self._port))
def run(self):
# def signal_handler(signal, frame):
# sys.exit(0)
self.start_serial()
# signal.signal(signal.SIGINT, signal_handler)
# signal.pause()
while True:
events = self._poll.poll()
for (fd, event) in events:
if event & (select.POLLHUP | select.POLLERR | select.POLLNVAL):
self.remove_poll_fd(fd)
self.gdb = None
continue
elif not event & select.POLLIN:
logger.error("unknown poll event occurred {}".format(str(event)))
raise Exception
if fd not in self._poll_handlers:
raise Exception("unknown fd raised poll event")
try:
status = self._poll_handlers[fd]()
if status is False:
logger.warning("Disconnected handler.")
self.remove_poll_fd(fd)
except udkserver.AbortError:
pass
if __name__ == "__main__":
udk_gdb_server = UdkGdbServer()
udk_gdb_server.run()